src/game.c

   1 // ============================================================================
   2 // Rocks'n'Diamonds - McDuffin Strikes Back!
   3 // ----------------------------------------------------------------------------
   4 // (c) 1995-2014 by Artsoft Entertainment
   5 //                  Holger Schemel
   6 //                  info@artsoft.org
   7 //                  https://www.artsoft.org/
   8 // ----------------------------------------------------------------------------
   9 // game.c
  10 // ============================================================================
  11
  12 #include "libgame/libgame.h"
  13
  14 #include "game.h"
  15 #include "init.h"
  16 #include "tools.h"
  17 #include "screens.h"
  18 #include "events.h"
  19 #include "files.h"
  20 #include "tape.h"
  21 #include "network.h"
  22 #include "anim.h"
  23
  24
  25 // DEBUG SETTINGS
  26 #define DEBUG_INIT_PLAYER       1
  27 #define DEBUG_PLAYER_ACTIONS    0
  28
  29 // EXPERIMENTAL STUFF
  30 #define USE_NEW_AMOEBA_CODE     FALSE
  31
  32 // EXPERIMENTAL STUFF
  33 #define USE_QUICKSAND_BD_ROCK_BUGFIX    0
  34 #define USE_QUICKSAND_IMPACT_BUGFIX     0
  35 #define USE_DELAYED_GFX_REDRAW          0
  36 #define USE_NEW_PLAYER_ASSIGNMENTS      1
  37
  38 #if USE_DELAYED_GFX_REDRAW
  39 #define TEST_DrawLevelField(x, y)                               \
  40         GfxRedraw[x][y] |= GFX_REDRAW_TILE
  41 #define TEST_DrawLevelFieldCrumbled(x, y)                       \
  42         GfxRedraw[x][y] |= GFX_REDRAW_TILE_CRUMBLED
  43 #define TEST_DrawLevelFieldCrumbledNeighbours(x, y)             \
  44         GfxRedraw[x][y] |= GFX_REDRAW_TILE_CRUMBLED_NEIGHBOURS
  45 #define TEST_DrawTwinkleOnField(x, y)                           \
  46         GfxRedraw[x][y] |= GFX_REDRAW_TILE_TWINKLED
  47 #else
  48 #define TEST_DrawLevelField(x, y)                               \
  49              DrawLevelField(x, y)
  50 #define TEST_DrawLevelFieldCrumbled(x, y)                       \
  51              DrawLevelFieldCrumbled(x, y)
  52 #define TEST_DrawLevelFieldCrumbledNeighbours(x, y)             \
  53              DrawLevelFieldCrumbledNeighbours(x, y)
  54 #define TEST_DrawTwinkleOnField(x, y)                           \
  55              DrawTwinkleOnField(x, y)
  56 #endif
  57
  58
  59 // for DigField()
  60 #define DF_NO_PUSH              0
  61 #define DF_DIG                  1
  62 #define DF_SNAP                 2
  63
  64 // for MovePlayer()
  65 #define MP_NO_ACTION            0
  66 #define MP_MOVING               1
  67 #define MP_ACTION               2
  68 #define MP_DONT_RUN_INTO        (MP_MOVING | MP_ACTION)
  69
  70 // for ScrollPlayer()
  71 #define SCROLL_INIT             0
  72 #define SCROLL_GO_ON            1
  73
  74 // for Bang()/Explode()
  75 #define EX_PHASE_START          0
  76 #define EX_TYPE_NONE            0
  77 #define EX_TYPE_NORMAL          (1 << 0)
  78 #define EX_TYPE_CENTER          (1 << 1)
  79 #define EX_TYPE_BORDER          (1 << 2)
  80 #define EX_TYPE_CROSS           (1 << 3)
  81 #define EX_TYPE_DYNA            (1 << 4)
  82 #define EX_TYPE_SINGLE_TILE     (EX_TYPE_CENTER | EX_TYPE_BORDER)
  83
  84 #define PANEL_OFF()             (game.panel.active == FALSE)
  85 #define PANEL_DEACTIVATED(p)    ((p)->x < 0 || (p)->y < 0 || PANEL_OFF())
  86 #define PANEL_XPOS(p)           (DX + ALIGNED_TEXT_XPOS(p))
  87 #define PANEL_YPOS(p)           (DY + ALIGNED_TEXT_YPOS(p))
  88
  89 // game panel display and control definitions
  90 #define GAME_PANEL_LEVEL_NUMBER                 0
  91 #define GAME_PANEL_GEMS                         1
  92 #define GAME_PANEL_INVENTORY_COUNT              2
  93 #define GAME_PANEL_INVENTORY_FIRST_1            3
  94 #define GAME_PANEL_INVENTORY_FIRST_2            4
  95 #define GAME_PANEL_INVENTORY_FIRST_3            5
  96 #define GAME_PANEL_INVENTORY_FIRST_4            6
  97 #define GAME_PANEL_INVENTORY_FIRST_5            7
  98 #define GAME_PANEL_INVENTORY_FIRST_6            8
  99 #define GAME_PANEL_INVENTORY_FIRST_7            9
 100 #define GAME_PANEL_INVENTORY_FIRST_8            10
 101 #define GAME_PANEL_INVENTORY_LAST_1             11
 102 #define GAME_PANEL_INVENTORY_LAST_2             12
 103 #define GAME_PANEL_INVENTORY_LAST_3             13
 104 #define GAME_PANEL_INVENTORY_LAST_4             14
 105 #define GAME_PANEL_INVENTORY_LAST_5             15
 106 #define GAME_PANEL_INVENTORY_LAST_6             16
 107 #define GAME_PANEL_INVENTORY_LAST_7             17
 108 #define GAME_PANEL_INVENTORY_LAST_8             18
 109 #define GAME_PANEL_KEY_1                        19
 110 #define GAME_PANEL_KEY_2                        20
 111 #define GAME_PANEL_KEY_3                        21
 112 #define GAME_PANEL_KEY_4                        22
 113 #define GAME_PANEL_KEY_5                        23
 114 #define GAME_PANEL_KEY_6                        24
 115 #define GAME_PANEL_KEY_7                        25
 116 #define GAME_PANEL_KEY_8                        26
 117 #define GAME_PANEL_KEY_WHITE                    27
 118 #define GAME_PANEL_KEY_WHITE_COUNT              28
 119 #define GAME_PANEL_SCORE                        29
 120 #define GAME_PANEL_HIGHSCORE                    30
 121 #define GAME_PANEL_TIME                         31
 122 #define GAME_PANEL_TIME_HH                      32
 123 #define GAME_PANEL_TIME_MM                      33
 124 #define GAME_PANEL_TIME_SS                      34
 125 #define GAME_PANEL_TIME_ANIM                    35
 126 #define GAME_PANEL_HEALTH                       36
 127 #define GAME_PANEL_HEALTH_ANIM                  37
 128 #define GAME_PANEL_FRAME                        38
 129 #define GAME_PANEL_SHIELD_NORMAL                39
 130 #define GAME_PANEL_SHIELD_NORMAL_TIME           40
 131 #define GAME_PANEL_SHIELD_DEADLY                41
 132 #define GAME_PANEL_SHIELD_DEADLY_TIME           42
 133 #define GAME_PANEL_EXIT                         43
 134 #define GAME_PANEL_EMC_MAGIC_BALL               44
 135 #define GAME_PANEL_EMC_MAGIC_BALL_SWITCH        45
 136 #define GAME_PANEL_LIGHT_SWITCH                 46
 137 #define GAME_PANEL_LIGHT_SWITCH_TIME            47
 138 #define GAME_PANEL_TIMEGATE_SWITCH              48
 139 #define GAME_PANEL_TIMEGATE_SWITCH_TIME         49
 140 #define GAME_PANEL_SWITCHGATE_SWITCH            50
 141 #define GAME_PANEL_EMC_LENSES                   51
 142 #define GAME_PANEL_EMC_LENSES_TIME              52
 143 #define GAME_PANEL_EMC_MAGNIFIER                53
 144 #define GAME_PANEL_EMC_MAGNIFIER_TIME           54
 145 #define GAME_PANEL_BALLOON_SWITCH               55
 146 #define GAME_PANEL_DYNABOMB_NUMBER              56
 147 #define GAME_PANEL_DYNABOMB_SIZE                57
 148 #define GAME_PANEL_DYNABOMB_POWER               58
 149 #define GAME_PANEL_PENGUINS                     59
 150 #define GAME_PANEL_SOKOBAN_OBJECTS              60
 151 #define GAME_PANEL_SOKOBAN_FIELDS               61
 152 #define GAME_PANEL_ROBOT_WHEEL                  62
 153 #define GAME_PANEL_CONVEYOR_BELT_1              63
 154 #define GAME_PANEL_CONVEYOR_BELT_2              64
 155 #define GAME_PANEL_CONVEYOR_BELT_3              65
 156 #define GAME_PANEL_CONVEYOR_BELT_4              66
 157 #define GAME_PANEL_CONVEYOR_BELT_1_SWITCH       67
 158 #define GAME_PANEL_CONVEYOR_BELT_2_SWITCH       68
 159 #define GAME_PANEL_CONVEYOR_BELT_3_SWITCH       69
 160 #define GAME_PANEL_CONVEYOR_BELT_4_SWITCH       70
 161 #define GAME_PANEL_MAGIC_WALL                   71
 162 #define GAME_PANEL_MAGIC_WALL_TIME              72
 163 #define GAME_PANEL_GRAVITY_STATE                73
 164 #define GAME_PANEL_GRAPHIC_1                    74
 165 #define GAME_PANEL_GRAPHIC_2                    75
 166 #define GAME_PANEL_GRAPHIC_3                    76
 167 #define GAME_PANEL_GRAPHIC_4                    77
 168 #define GAME_PANEL_GRAPHIC_5                    78
 169 #define GAME_PANEL_GRAPHIC_6                    79
 170 #define GAME_PANEL_GRAPHIC_7                    80
 171 #define GAME_PANEL_GRAPHIC_8                    81
 172 #define GAME_PANEL_ELEMENT_1                    82
 173 #define GAME_PANEL_ELEMENT_2                    83
 174 #define GAME_PANEL_ELEMENT_3                    84
 175 #define GAME_PANEL_ELEMENT_4                    85
 176 #define GAME_PANEL_ELEMENT_5                    86
 177 #define GAME_PANEL_ELEMENT_6                    87
 178 #define GAME_PANEL_ELEMENT_7                    88
 179 #define GAME_PANEL_ELEMENT_8                    89
 180 #define GAME_PANEL_ELEMENT_COUNT_1              90
 181 #define GAME_PANEL_ELEMENT_COUNT_2              91
 182 #define GAME_PANEL_ELEMENT_COUNT_3              92
 183 #define GAME_PANEL_ELEMENT_COUNT_4              93
 184 #define GAME_PANEL_ELEMENT_COUNT_5              94
 185 #define GAME_PANEL_ELEMENT_COUNT_6              95
 186 #define GAME_PANEL_ELEMENT_COUNT_7              96
 187 #define GAME_PANEL_ELEMENT_COUNT_8              97
 188 #define GAME_PANEL_CE_SCORE_1                   98
 189 #define GAME_PANEL_CE_SCORE_2                   99
 190 #define GAME_PANEL_CE_SCORE_3                   100
 191 #define GAME_PANEL_CE_SCORE_4                   101
 192 #define GAME_PANEL_CE_SCORE_5                   102
 193 #define GAME_PANEL_CE_SCORE_6                   103
 194 #define GAME_PANEL_CE_SCORE_7                   104
 195 #define GAME_PANEL_CE_SCORE_8                   105
 196 #define GAME_PANEL_CE_SCORE_1_ELEMENT           106
 197 #define GAME_PANEL_CE_SCORE_2_ELEMENT           107
 198 #define GAME_PANEL_CE_SCORE_3_ELEMENT           108
 199 #define GAME_PANEL_CE_SCORE_4_ELEMENT           109
 200 #define GAME_PANEL_CE_SCORE_5_ELEMENT           110
 201 #define GAME_PANEL_CE_SCORE_6_ELEMENT           111
 202 #define GAME_PANEL_CE_SCORE_7_ELEMENT           112
 203 #define GAME_PANEL_CE_SCORE_8_ELEMENT           113
 204 #define GAME_PANEL_PLAYER_NAME                  114
 205 #define GAME_PANEL_LEVEL_NAME                   115
 206 #define GAME_PANEL_LEVEL_AUTHOR                 116
 207
 208 #define NUM_GAME_PANEL_CONTROLS                 117
 209
 210 struct GamePanelOrderInfo
 211 {
 212   int nr;
 213   int sort_priority;
 214 };
 215
 216 static struct GamePanelOrderInfo game_panel_order[NUM_GAME_PANEL_CONTROLS];
 217
 218 struct GamePanelControlInfo
 219 {
 220   int nr;
 221
 222   struct TextPosInfo *pos;
 223   int type;
 224
 225   int graphic, graphic_active;
 226
 227   int value, last_value;
 228   int frame, last_frame;
 229   int gfx_frame;
 230   int gfx_random;
 231 };
 232
 233 static struct GamePanelControlInfo game_panel_controls[] =
 234 {
 235   {
 236     GAME_PANEL_LEVEL_NUMBER,
 237     &game.panel.level_number,
 238     TYPE_INTEGER,
 239   },
 240   {
 241     GAME_PANEL_GEMS,
 242     &game.panel.gems,
 243     TYPE_INTEGER,
 244   },
 245   {
 246     GAME_PANEL_INVENTORY_COUNT,
 247     &game.panel.inventory_count,
 248     TYPE_INTEGER,
 249   },
 250   {
 251     GAME_PANEL_INVENTORY_FIRST_1,
 252     &game.panel.inventory_first[0],
 253     TYPE_ELEMENT,
 254   },
 255   {
 256     GAME_PANEL_INVENTORY_FIRST_2,
 257     &game.panel.inventory_first[1],
 258     TYPE_ELEMENT,
 259   },
 260   {
 261     GAME_PANEL_INVENTORY_FIRST_3,
 262     &game.panel.inventory_first[2],
 263     TYPE_ELEMENT,
 264   },
 265   {
 266     GAME_PANEL_INVENTORY_FIRST_4,
 267     &game.panel.inventory_first[3],
 268     TYPE_ELEMENT,
 269   },
 270   {
 271     GAME_PANEL_INVENTORY_FIRST_5,
 272     &game.panel.inventory_first[4],
 273     TYPE_ELEMENT,
 274   },
 275   {
 276     GAME_PANEL_INVENTORY_FIRST_6,
 277     &game.panel.inventory_first[5],
 278     TYPE_ELEMENT,
 279   },
 280   {
 281     GAME_PANEL_INVENTORY_FIRST_7,
 282     &game.panel.inventory_first[6],
 283     TYPE_ELEMENT,
 284   },
 285   {
 286     GAME_PANEL_INVENTORY_FIRST_8,
 287     &game.panel.inventory_first[7],
 288     TYPE_ELEMENT,
 289   },
 290   {
 291     GAME_PANEL_INVENTORY_LAST_1,
 292     &game.panel.inventory_last[0],
 293     TYPE_ELEMENT,
 294   },
 295   {
 296     GAME_PANEL_INVENTORY_LAST_2,
 297     &game.panel.inventory_last[1],
 298     TYPE_ELEMENT,
 299   },
 300   {
 301     GAME_PANEL_INVENTORY_LAST_3,
 302     &game.panel.inventory_last[2],
 303     TYPE_ELEMENT,
 304   },
 305   {
 306     GAME_PANEL_INVENTORY_LAST_4,
 307     &game.panel.inventory_last[3],
 308     TYPE_ELEMENT,
 309   },
 310   {
 311     GAME_PANEL_INVENTORY_LAST_5,
 312     &game.panel.inventory_last[4],
 313     TYPE_ELEMENT,
 314   },
 315   {
 316     GAME_PANEL_INVENTORY_LAST_6,
 317     &game.panel.inventory_last[5],
 318     TYPE_ELEMENT,
 319   },
 320   {
 321     GAME_PANEL_INVENTORY_LAST_7,
 322     &game.panel.inventory_last[6],
 323     TYPE_ELEMENT,
 324   },
 325   {
 326     GAME_PANEL_INVENTORY_LAST_8,
 327     &game.panel.inventory_last[7],
 328     TYPE_ELEMENT,
 329   },
 330   {
 331     GAME_PANEL_KEY_1,
 332     &game.panel.key[0],
 333     TYPE_ELEMENT,
 334   },
 335   {
 336     GAME_PANEL_KEY_2,
 337     &game.panel.key[1],
 338     TYPE_ELEMENT,
 339   },
 340   {
 341     GAME_PANEL_KEY_3,
 342     &game.panel.key[2],
 343     TYPE_ELEMENT,
 344   },
 345   {
 346     GAME_PANEL_KEY_4,
 347     &game.panel.key[3],
 348     TYPE_ELEMENT,
 349   },
 350   {
 351     GAME_PANEL_KEY_5,
 352     &game.panel.key[4],
 353     TYPE_ELEMENT,
 354   },
 355   {
 356     GAME_PANEL_KEY_6,
 357     &game.panel.key[5],
 358     TYPE_ELEMENT,
 359   },
 360   {
 361     GAME_PANEL_KEY_7,
 362     &game.panel.key[6],
 363     TYPE_ELEMENT,
 364   },
 365   {
 366     GAME_PANEL_KEY_8,
 367     &game.panel.key[7],
 368     TYPE_ELEMENT,
 369   },
 370   {
 371     GAME_PANEL_KEY_WHITE,
 372     &game.panel.key_white,
 373     TYPE_ELEMENT,
 374   },
 375   {
 376     GAME_PANEL_KEY_WHITE_COUNT,
 377     &game.panel.key_white_count,
 378     TYPE_INTEGER,
 379   },
 380   {
 381     GAME_PANEL_SCORE,
 382     &game.panel.score,
 383     TYPE_INTEGER,
 384   },
 385   {
 386     GAME_PANEL_HIGHSCORE,
 387     &game.panel.highscore,
 388     TYPE_INTEGER,
 389   },
 390   {
 391     GAME_PANEL_TIME,
 392     &game.panel.time,
 393     TYPE_INTEGER,
 394   },
 395   {
 396     GAME_PANEL_TIME_HH,
 397     &game.panel.time_hh,
 398     TYPE_INTEGER,
 399   },
 400   {
 401     GAME_PANEL_TIME_MM,
 402     &game.panel.time_mm,
 403     TYPE_INTEGER,
 404   },
 405   {
 406     GAME_PANEL_TIME_SS,
 407     &game.panel.time_ss,
 408     TYPE_INTEGER,
 409   },
 410   {
 411     GAME_PANEL_TIME_ANIM,
 412     &game.panel.time_anim,
 413     TYPE_GRAPHIC,
 414
 415     IMG_GFX_GAME_PANEL_TIME_ANIM,
 416     IMG_GFX_GAME_PANEL_TIME_ANIM_ACTIVE
 417   },
 418   {
 419     GAME_PANEL_HEALTH,
 420     &game.panel.health,
 421     TYPE_INTEGER,
 422   },
 423   {
 424     GAME_PANEL_HEALTH_ANIM,
 425     &game.panel.health_anim,
 426     TYPE_GRAPHIC,
 427
 428     IMG_GFX_GAME_PANEL_HEALTH_ANIM,
 429     IMG_GFX_GAME_PANEL_HEALTH_ANIM_ACTIVE
 430   },
 431   {
 432     GAME_PANEL_FRAME,
 433     &game.panel.frame,
 434     TYPE_INTEGER,
 435   },
 436   {
 437     GAME_PANEL_SHIELD_NORMAL,
 438     &game.panel.shield_normal,
 439     TYPE_ELEMENT,
 440   },
 441   {
 442     GAME_PANEL_SHIELD_NORMAL_TIME,
 443     &game.panel.shield_normal_time,
 444     TYPE_INTEGER,
 445   },
 446   {
 447     GAME_PANEL_SHIELD_DEADLY,
 448     &game.panel.shield_deadly,
 449     TYPE_ELEMENT,
 450   },
 451   {
 452     GAME_PANEL_SHIELD_DEADLY_TIME,
 453     &game.panel.shield_deadly_time,
 454     TYPE_INTEGER,
 455   },
 456   {
 457     GAME_PANEL_EXIT,
 458     &game.panel.exit,
 459     TYPE_ELEMENT,
 460   },
 461   {
 462     GAME_PANEL_EMC_MAGIC_BALL,
 463     &game.panel.emc_magic_ball,
 464     TYPE_ELEMENT,
 465   },
 466   {
 467     GAME_PANEL_EMC_MAGIC_BALL_SWITCH,
 468     &game.panel.emc_magic_ball_switch,
 469     TYPE_ELEMENT,
 470   },
 471   {
 472     GAME_PANEL_LIGHT_SWITCH,
 473     &game.panel.light_switch,
 474     TYPE_ELEMENT,
 475   },
 476   {
 477     GAME_PANEL_LIGHT_SWITCH_TIME,
 478     &game.panel.light_switch_time,
 479     TYPE_INTEGER,
 480   },
 481   {
 482     GAME_PANEL_TIMEGATE_SWITCH,
 483     &game.panel.timegate_switch,
 484     TYPE_ELEMENT,
 485   },
 486   {
 487     GAME_PANEL_TIMEGATE_SWITCH_TIME,
 488     &game.panel.timegate_switch_time,
 489     TYPE_INTEGER,
 490   },
 491   {
 492     GAME_PANEL_SWITCHGATE_SWITCH,
 493     &game.panel.switchgate_switch,
 494     TYPE_ELEMENT,
 495   },
 496   {
 497     GAME_PANEL_EMC_LENSES,
 498     &game.panel.emc_lenses,
 499     TYPE_ELEMENT,
 500   },
 501   {
 502     GAME_PANEL_EMC_LENSES_TIME,
 503     &game.panel.emc_lenses_time,
 504     TYPE_INTEGER,
 505   },
 506   {
 507     GAME_PANEL_EMC_MAGNIFIER,
 508     &game.panel.emc_magnifier,
 509     TYPE_ELEMENT,
 510   },
 511   {
 512     GAME_PANEL_EMC_MAGNIFIER_TIME,
 513     &game.panel.emc_magnifier_time,
 514     TYPE_INTEGER,
 515   },
 516   {
 517     GAME_PANEL_BALLOON_SWITCH,
 518     &game.panel.balloon_switch,
 519     TYPE_ELEMENT,
 520   },
 521   {
 522     GAME_PANEL_DYNABOMB_NUMBER,
 523     &game.panel.dynabomb_number,
 524     TYPE_INTEGER,
 525   },
 526   {
 527     GAME_PANEL_DYNABOMB_SIZE,
 528     &game.panel.dynabomb_size,
 529     TYPE_INTEGER,
 530   },
 531   {
 532     GAME_PANEL_DYNABOMB_POWER,
 533     &game.panel.dynabomb_power,
 534     TYPE_ELEMENT,
 535   },
 536   {
 537     GAME_PANEL_PENGUINS,
 538     &game.panel.penguins,
 539     TYPE_INTEGER,
 540   },
 541   {
 542     GAME_PANEL_SOKOBAN_OBJECTS,
 543     &game.panel.sokoban_objects,
 544     TYPE_INTEGER,
 545   },
 546   {
 547     GAME_PANEL_SOKOBAN_FIELDS,
 548     &game.panel.sokoban_fields,
 549     TYPE_INTEGER,
 550   },
 551   {
 552     GAME_PANEL_ROBOT_WHEEL,
 553     &game.panel.robot_wheel,
 554     TYPE_ELEMENT,
 555   },
 556   {
 557     GAME_PANEL_CONVEYOR_BELT_1,
 558     &game.panel.conveyor_belt[0],
 559     TYPE_ELEMENT,
 560   },
 561   {
 562     GAME_PANEL_CONVEYOR_BELT_2,
 563     &game.panel.conveyor_belt[1],
 564     TYPE_ELEMENT,
 565   },
 566   {
 567     GAME_PANEL_CONVEYOR_BELT_3,
 568     &game.panel.conveyor_belt[2],
 569     TYPE_ELEMENT,
 570   },
 571   {
 572     GAME_PANEL_CONVEYOR_BELT_4,
 573     &game.panel.conveyor_belt[3],
 574     TYPE_ELEMENT,
 575   },
 576   {
 577     GAME_PANEL_CONVEYOR_BELT_1_SWITCH,
 578     &game.panel.conveyor_belt_switch[0],
 579     TYPE_ELEMENT,
 580   },
 581   {
 582     GAME_PANEL_CONVEYOR_BELT_2_SWITCH,
 583     &game.panel.conveyor_belt_switch[1],
 584     TYPE_ELEMENT,
 585   },
 586   {
 587     GAME_PANEL_CONVEYOR_BELT_3_SWITCH,
 588     &game.panel.conveyor_belt_switch[2],
 589     TYPE_ELEMENT,
 590   },
 591   {
 592     GAME_PANEL_CONVEYOR_BELT_4_SWITCH,
 593     &game.panel.conveyor_belt_switch[3],
 594     TYPE_ELEMENT,
 595   },
 596   {
 597     GAME_PANEL_MAGIC_WALL,
 598     &game.panel.magic_wall,
 599     TYPE_ELEMENT,
 600   },
 601   {
 602     GAME_PANEL_MAGIC_WALL_TIME,
 603     &game.panel.magic_wall_time,
 604     TYPE_INTEGER,
 605   },
 606   {
 607     GAME_PANEL_GRAVITY_STATE,
 608     &game.panel.gravity_state,
 609     TYPE_STRING,
 610   },
 611   {
 612     GAME_PANEL_GRAPHIC_1,
 613     &game.panel.graphic[0],
 614     TYPE_ELEMENT,
 615   },
 616   {
 617     GAME_PANEL_GRAPHIC_2,
 618     &game.panel.graphic[1],
 619     TYPE_ELEMENT,
 620   },
 621   {
 622     GAME_PANEL_GRAPHIC_3,
 623     &game.panel.graphic[2],
 624     TYPE_ELEMENT,
 625   },
 626   {
 627     GAME_PANEL_GRAPHIC_4,
 628     &game.panel.graphic[3],
 629     TYPE_ELEMENT,
 630   },
 631   {
 632     GAME_PANEL_GRAPHIC_5,
 633     &game.panel.graphic[4],
 634     TYPE_ELEMENT,
 635   },
 636   {
 637     GAME_PANEL_GRAPHIC_6,
 638     &game.panel.graphic[5],
 639     TYPE_ELEMENT,
 640   },
 641   {
 642     GAME_PANEL_GRAPHIC_7,
 643     &game.panel.graphic[6],
 644     TYPE_ELEMENT,
 645   },
 646   {
 647     GAME_PANEL_GRAPHIC_8,
 648     &game.panel.graphic[7],
 649     TYPE_ELEMENT,
 650   },
 651   {
 652     GAME_PANEL_ELEMENT_1,
 653     &game.panel.element[0],
 654     TYPE_ELEMENT,
 655   },
 656   {
 657     GAME_PANEL_ELEMENT_2,
 658     &game.panel.element[1],
 659     TYPE_ELEMENT,
 660   },
 661   {
 662     GAME_PANEL_ELEMENT_3,
 663     &game.panel.element[2],
 664     TYPE_ELEMENT,
 665   },
 666   {
 667     GAME_PANEL_ELEMENT_4,
 668     &game.panel.element[3],
 669     TYPE_ELEMENT,
 670   },
 671   {
 672     GAME_PANEL_ELEMENT_5,
 673     &game.panel.element[4],
 674     TYPE_ELEMENT,
 675   },
 676   {
 677     GAME_PANEL_ELEMENT_6,
 678     &game.panel.element[5],
 679     TYPE_ELEMENT,
 680   },
 681   {
 682     GAME_PANEL_ELEMENT_7,
 683     &game.panel.element[6],
 684     TYPE_ELEMENT,
 685   },
 686   {
 687     GAME_PANEL_ELEMENT_8,
 688     &game.panel.element[7],
 689     TYPE_ELEMENT,
 690   },
 691   {
 692     GAME_PANEL_ELEMENT_COUNT_1,
 693     &game.panel.element_count[0],
 694     TYPE_INTEGER,
 695   },
 696   {
 697     GAME_PANEL_ELEMENT_COUNT_2,
 698     &game.panel.element_count[1],
 699     TYPE_INTEGER,
 700   },
 701   {
 702     GAME_PANEL_ELEMENT_COUNT_3,
 703     &game.panel.element_count[2],
 704     TYPE_INTEGER,
 705   },
 706   {
 707     GAME_PANEL_ELEMENT_COUNT_4,
 708     &game.panel.element_count[3],
 709     TYPE_INTEGER,
 710   },
 711   {
 712     GAME_PANEL_ELEMENT_COUNT_5,
 713     &game.panel.element_count[4],
 714     TYPE_INTEGER,
 715   },
 716   {
 717     GAME_PANEL_ELEMENT_COUNT_6,
 718     &game.panel.element_count[5],
 719     TYPE_INTEGER,
 720   },
 721   {
 722     GAME_PANEL_ELEMENT_COUNT_7,
 723     &game.panel.element_count[6],
 724     TYPE_INTEGER,
 725   },
 726   {
 727     GAME_PANEL_ELEMENT_COUNT_8,
 728     &game.panel.element_count[7],
 729     TYPE_INTEGER,
 730   },
 731   {
 732     GAME_PANEL_CE_SCORE_1,
 733     &game.panel.ce_score[0],
 734     TYPE_INTEGER,
 735   },
 736   {
 737     GAME_PANEL_CE_SCORE_2,
 738     &game.panel.ce_score[1],
 739     TYPE_INTEGER,
 740   },
 741   {
 742     GAME_PANEL_CE_SCORE_3,
 743     &game.panel.ce_score[2],
 744     TYPE_INTEGER,
 745   },
 746   {
 747     GAME_PANEL_CE_SCORE_4,
 748     &game.panel.ce_score[3],
 749     TYPE_INTEGER,
 750   },
 751   {
 752     GAME_PANEL_CE_SCORE_5,
 753     &game.panel.ce_score[4],
 754     TYPE_INTEGER,
 755   },
 756   {
 757     GAME_PANEL_CE_SCORE_6,
 758     &game.panel.ce_score[5],
 759     TYPE_INTEGER,
 760   },
 761   {
 762     GAME_PANEL_CE_SCORE_7,
 763     &game.panel.ce_score[6],
 764     TYPE_INTEGER,
 765   },
 766   {
 767     GAME_PANEL_CE_SCORE_8,
 768     &game.panel.ce_score[7],
 769     TYPE_INTEGER,
 770   },
 771   {
 772     GAME_PANEL_CE_SCORE_1_ELEMENT,
 773     &game.panel.ce_score_element[0],
 774     TYPE_ELEMENT,
 775   },
 776   {
 777     GAME_PANEL_CE_SCORE_2_ELEMENT,
 778     &game.panel.ce_score_element[1],
 779     TYPE_ELEMENT,
 780   },
 781   {
 782     GAME_PANEL_CE_SCORE_3_ELEMENT,
 783     &game.panel.ce_score_element[2],
 784     TYPE_ELEMENT,
 785   },
 786   {
 787     GAME_PANEL_CE_SCORE_4_ELEMENT,
 788     &game.panel.ce_score_element[3],
 789     TYPE_ELEMENT,
 790   },
 791   {
 792     GAME_PANEL_CE_SCORE_5_ELEMENT,
 793     &game.panel.ce_score_element[4],
 794     TYPE_ELEMENT,
 795   },
 796   {
 797     GAME_PANEL_CE_SCORE_6_ELEMENT,
 798     &game.panel.ce_score_element[5],
 799     TYPE_ELEMENT,
 800   },
 801   {
 802     GAME_PANEL_CE_SCORE_7_ELEMENT,
 803     &game.panel.ce_score_element[6],
 804     TYPE_ELEMENT,
 805   },
 806   {
 807     GAME_PANEL_CE_SCORE_8_ELEMENT,
 808     &game.panel.ce_score_element[7],
 809     TYPE_ELEMENT,
 810   },
 811   {
 812     GAME_PANEL_PLAYER_NAME,
 813     &game.panel.player_name,
 814     TYPE_STRING,
 815   },
 816   {
 817     GAME_PANEL_LEVEL_NAME,
 818     &game.panel.level_name,
 819     TYPE_STRING,
 820   },
 821   {
 822     GAME_PANEL_LEVEL_AUTHOR,
 823     &game.panel.level_author,
 824     TYPE_STRING,
 825   },
 826
 827   {
 828     -1,
 829     NULL,
 830     -1,
 831   }
 832 };
 833
 834 // values for delayed check of falling and moving elements and for collision
 835 #define CHECK_DELAY_MOVING      3
 836 #define CHECK_DELAY_FALLING     CHECK_DELAY_MOVING
 837 #define CHECK_DELAY_COLLISION   2
 838 #define CHECK_DELAY_IMPACT      CHECK_DELAY_COLLISION
 839
 840 // values for initial player move delay (initial delay counter value)
 841 #define INITIAL_MOVE_DELAY_OFF  -1
 842 #define INITIAL_MOVE_DELAY_ON   0
 843
 844 // values for player movement speed (which is in fact a delay value)
 845 #define MOVE_DELAY_MIN_SPEED    32
 846 #define MOVE_DELAY_NORMAL_SPEED 8
 847 #define MOVE_DELAY_HIGH_SPEED   4
 848 #define MOVE_DELAY_MAX_SPEED    1
 849
 850 #define DOUBLE_MOVE_DELAY(x)    (x = (x < MOVE_DELAY_MIN_SPEED ? x * 2 : x))
 851 #define HALVE_MOVE_DELAY(x)     (x = (x > MOVE_DELAY_MAX_SPEED ? x / 2 : x))
 852
 853 #define DOUBLE_PLAYER_SPEED(p)  (HALVE_MOVE_DELAY( (p)->move_delay_value))
 854 #define HALVE_PLAYER_SPEED(p)   (DOUBLE_MOVE_DELAY((p)->move_delay_value))
 855
 856 // values for scroll positions
 857 #define SCROLL_POSITION_X(x)    ((x) < SBX_Left  + MIDPOSX ? SBX_Left : \
 858                                  (x) > SBX_Right + MIDPOSX ? SBX_Right :\
 859                                  (x) - MIDPOSX)
 860 #define SCROLL_POSITION_Y(y)    ((y) < SBY_Upper + MIDPOSY ? SBY_Upper :\
 861                                  (y) > SBY_Lower + MIDPOSY ? SBY_Lower :\
 862                                  (y) - MIDPOSY)
 863
 864 // values for other actions
 865 #define MOVE_STEPSIZE_NORMAL    (TILEX / MOVE_DELAY_NORMAL_SPEED)
 866 #define MOVE_STEPSIZE_MIN       (1)
 867 #define MOVE_STEPSIZE_MAX       (TILEX)
 868
 869 #define GET_DX_FROM_DIR(d)      ((d) == MV_LEFT ? -1 : (d) == MV_RIGHT ? 1 : 0)
 870 #define GET_DY_FROM_DIR(d)      ((d) == MV_UP   ? -1 : (d) == MV_DOWN  ? 1 : 0)
 871
 872 #define INIT_GFX_RANDOM()       (GetSimpleRandom(1000000))
 873
 874 #define GET_NEW_PUSH_DELAY(e)   (   (element_info[e].push_delay_fixed) + \
 875                                  RND(element_info[e].push_delay_random))
 876 #define GET_NEW_DROP_DELAY(e)   (   (element_info[e].drop_delay_fixed) + \
 877                                  RND(element_info[e].drop_delay_random))
 878 #define GET_NEW_MOVE_DELAY(e)   (   (element_info[e].move_delay_fixed) + \
 879                                  RND(element_info[e].move_delay_random))
 880 #define GET_MAX_MOVE_DELAY(e)   (   (element_info[e].move_delay_fixed) + \
 881                                     (element_info[e].move_delay_random))
 882 #define GET_NEW_STEP_DELAY(e)   (   (element_info[e].step_delay_fixed) + \
 883                                  RND(element_info[e].step_delay_random))
 884 #define GET_MAX_STEP_DELAY(e)   (   (element_info[e].step_delay_fixed) + \
 885                                     (element_info[e].step_delay_random))
 886 #define GET_NEW_CE_VALUE(e)     (   (element_info[e].ce_value_fixed_initial) +\
 887                                  RND(element_info[e].ce_value_random_initial))
 888 #define GET_CE_SCORE(e)         (   (element_info[e].collect_score))
 889 #define GET_CHANGE_DELAY(c)     (   ((c)->delay_fixed  * (c)->delay_frames) + \
 890                                  RND((c)->delay_random * (c)->delay_frames))
 891 #define GET_CE_DELAY_VALUE(c)   (   ((c)->delay_fixed) + \
 892                                  RND((c)->delay_random))
 893
 894
 895 #define GET_VALID_RUNTIME_ELEMENT(e)                                    \
 896          ((e) >= NUM_RUNTIME_ELEMENTS ? EL_UNKNOWN : (e))
 897
 898 #define RESOLVED_REFERENCE_ELEMENT(be, e)                               \
 899         ((be) + (e) - EL_SELF < EL_CUSTOM_START ? EL_CUSTOM_START :     \
 900          (be) + (e) - EL_SELF > EL_CUSTOM_END   ? EL_CUSTOM_END :       \
 901          (be) + (e) - EL_SELF)
 902
 903 #define GET_PLAYER_FROM_BITS(p)                                         \
 904         (EL_PLAYER_1 + ((p) != PLAYER_BITS_ANY ? log_2(p) : 0))
 905
 906 #define GET_TARGET_ELEMENT(be, e, ch, cv, cs)                           \
 907         ((e) == EL_TRIGGER_PLAYER   ? (ch)->actual_trigger_player    :  \
 908          (e) == EL_TRIGGER_ELEMENT  ? (ch)->actual_trigger_element   :  \
 909          (e) == EL_TRIGGER_CE_VALUE ? (ch)->actual_trigger_ce_value  :  \
 910          (e) == EL_TRIGGER_CE_SCORE ? (ch)->actual_trigger_ce_score  :  \
 911          (e) == EL_CURRENT_CE_VALUE ? (cv) :                            \
 912          (e) == EL_CURRENT_CE_SCORE ? (cs) :                            \
 913          (e) >= EL_PREV_CE_8 && (e) <= EL_NEXT_CE_8 ?                   \
 914          RESOLVED_REFERENCE_ELEMENT(be, e) :                            \
 915          (e))
 916
 917 #define CAN_GROW_INTO(e)                                                \
 918         ((e) == EL_SAND || (IS_DIGGABLE(e) && level.grow_into_diggable))
 919
 920 #define ELEMENT_CAN_ENTER_FIELD_BASE_X(x, y, condition)                 \
 921                 (IN_LEV_FIELD(x, y) && (IS_FREE(x, y) ||                \
 922                                         (condition)))
 923
 924 #define ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, condition)              \
 925                 (IN_LEV_FIELD(x, y) && (IS_FREE(x, y) ||                \
 926                                         (CAN_MOVE_INTO_ACID(e) &&       \
 927                                          Tile[x][y] == EL_ACID) ||      \
 928                                         (condition)))
 929
 930 #define ELEMENT_CAN_ENTER_FIELD_BASE_3(e, x, y, condition)              \
 931                 (IN_LEV_FIELD(x, y) && (IS_FREE_OR_PLAYER(x, y) ||      \
 932                                         (CAN_MOVE_INTO_ACID(e) &&       \
 933                                          Tile[x][y] == EL_ACID) ||      \
 934                                         (condition)))
 935
 936 #define ELEMENT_CAN_ENTER_FIELD_BASE_4(e, x, y, condition)              \
 937                 (IN_LEV_FIELD(x, y) && (IS_FREE(x, y) ||                \
 938                                         (condition) ||                  \
 939                                         (CAN_MOVE_INTO_ACID(e) &&       \
 940                                          Tile[x][y] == EL_ACID) ||      \
 941                                         (DONT_COLLIDE_WITH(e) &&        \
 942                                          IS_PLAYER(x, y) &&             \
 943                                          !PLAYER_ENEMY_PROTECTED(x, y))))
 944
 945 #define ELEMENT_CAN_ENTER_FIELD(e, x, y)                                \
 946         ELEMENT_CAN_ENTER_FIELD_BASE_4(e, x, y, 0)
 947
 948 #define SATELLITE_CAN_ENTER_FIELD(x, y)                                 \
 949         ELEMENT_CAN_ENTER_FIELD_BASE_2(EL_SATELLITE, x, y, 0)
 950
 951 #define ANDROID_CAN_ENTER_FIELD(e, x, y)                                \
 952         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, Tile[x][y] == EL_EMC_PLANT)
 953
 954 #define ANDROID_CAN_CLONE_FIELD(x, y)                                   \
 955         (IN_LEV_FIELD(x, y) && (CAN_BE_CLONED_BY_ANDROID(Tile[x][y]) || \
 956                                 CAN_BE_CLONED_BY_ANDROID(EL_TRIGGER_ELEMENT)))
 957
 958 #define ENEMY_CAN_ENTER_FIELD(e, x, y)                                  \
 959         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, 0)
 960
 961 #define YAMYAM_CAN_ENTER_FIELD(e, x, y)                                 \
 962         ELEMENT_CAN_ENTER_FIELD_BASE_3(e, x, y, Tile[x][y] == EL_DIAMOND)
 963
 964 #define DARK_YAMYAM_CAN_ENTER_FIELD(e, x, y)                            \
 965         ELEMENT_CAN_ENTER_FIELD_BASE_3(e, x,y, IS_FOOD_DARK_YAMYAM(Tile[x][y]))
 966
 967 #define PACMAN_CAN_ENTER_FIELD(e, x, y)                                 \
 968         ELEMENT_CAN_ENTER_FIELD_BASE_3(e, x, y, IS_AMOEBOID(Tile[x][y]))
 969
 970 #define PIG_CAN_ENTER_FIELD(e, x, y)                                    \
 971         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, IS_FOOD_PIG(Tile[x][y]))
 972
 973 #define PENGUIN_CAN_ENTER_FIELD(e, x, y)                                \
 974         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, (Tile[x][y] == EL_EXIT_OPEN || \
 975                                                  Tile[x][y] == EL_EM_EXIT_OPEN || \
 976                                                  Tile[x][y] == EL_STEEL_EXIT_OPEN || \
 977                                                  Tile[x][y] == EL_EM_STEEL_EXIT_OPEN || \
 978                                                  IS_FOOD_PENGUIN(Tile[x][y])))
 979 #define DRAGON_CAN_ENTER_FIELD(e, x, y)                                 \
 980         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, 0)
 981
 982 #define MOLE_CAN_ENTER_FIELD(e, x, y, condition)                        \
 983         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, (condition))
 984
 985 #define SPRING_CAN_ENTER_FIELD(e, x, y)                                 \
 986         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, 0)
 987
 988 #define SPRING_CAN_BUMP_FROM_FIELD(x, y)                                \
 989         (IN_LEV_FIELD(x, y) && (Tile[x][y] == EL_EMC_SPRING_BUMPER ||   \
 990                                 Tile[x][y] == EL_EMC_SPRING_BUMPER_ACTIVE))
 991
 992 #define MOVE_ENTER_EL(e)        (element_info[e].move_enter_element)
 993
 994 #define CE_ENTER_FIELD_COND(e, x, y)                                    \
 995                 (!IS_PLAYER(x, y) &&                                    \
 996                  IS_EQUAL_OR_IN_GROUP(Tile[x][y], MOVE_ENTER_EL(e)))
 997
 998 #define CUSTOM_ELEMENT_CAN_ENTER_FIELD(e, x, y)                         \
 999         ELEMENT_CAN_ENTER_FIELD_BASE_4(e, x, y, CE_ENTER_FIELD_COND(e, x, y))
1000
1001 #define IN_LEV_FIELD_AND_IS_FREE(x, y)  (IN_LEV_FIELD(x, y) &&  IS_FREE(x, y))
1002 #define IN_LEV_FIELD_AND_NOT_FREE(x, y) (IN_LEV_FIELD(x, y) && !IS_FREE(x, y))
1003
1004 #define ACCESS_FROM(e, d)               (element_info[e].access_direction &(d))
1005 #define IS_WALKABLE_FROM(e, d)          (IS_WALKABLE(e)   && ACCESS_FROM(e, d))
1006 #define IS_PASSABLE_FROM(e, d)          (IS_PASSABLE(e)   && ACCESS_FROM(e, d))
1007 #define IS_ACCESSIBLE_FROM(e, d)        (IS_ACCESSIBLE(e) && ACCESS_FROM(e, d))
1008
1009 #define MM_HEALTH(x)            (MIN(MAX(0, MAX_HEALTH - (x)), MAX_HEALTH))
1010
1011 // game button identifiers
1012 #define GAME_CTRL_ID_STOP               0
1013 #define GAME_CTRL_ID_PAUSE              1
1014 #define GAME_CTRL_ID_PLAY               2
1015 #define GAME_CTRL_ID_UNDO               3
1016 #define GAME_CTRL_ID_REDO               4
1017 #define GAME_CTRL_ID_SAVE               5
1018 #define GAME_CTRL_ID_PAUSE2             6
1019 #define GAME_CTRL_ID_LOAD               7
1020 #define GAME_CTRL_ID_PANEL_STOP         8
1021 #define GAME_CTRL_ID_PANEL_PAUSE        9
1022 #define GAME_CTRL_ID_PANEL_PLAY         10
1023 #define GAME_CTRL_ID_TOUCH_STOP         11
1024 #define GAME_CTRL_ID_TOUCH_PAUSE        12
1025 #define SOUND_CTRL_ID_MUSIC             13
1026 #define SOUND_CTRL_ID_LOOPS             14
1027 #define SOUND_CTRL_ID_SIMPLE            15
1028 #define SOUND_CTRL_ID_PANEL_MUSIC       16
1029 #define SOUND_CTRL_ID_PANEL_LOOPS       17
1030 #define SOUND_CTRL_ID_PANEL_SIMPLE      18
1031
1032 #define NUM_GAME_BUTTONS                19
1033
1034
1035 // forward declaration for internal use
1036
1037 static void CreateField(int, int, int);
1038
1039 static void ResetGfxAnimation(int, int);
1040
1041 static void SetPlayerWaiting(struct PlayerInfo *, boolean);
1042 static void AdvanceFrameAndPlayerCounters(int);
1043
1044 static boolean MovePlayerOneStep(struct PlayerInfo *, int, int, int, int);
1045 static boolean MovePlayer(struct PlayerInfo *, int, int);
1046 static void ScrollPlayer(struct PlayerInfo *, int);
1047 static void ScrollScreen(struct PlayerInfo *, int);
1048
1049 static int DigField(struct PlayerInfo *, int, int, int, int, int, int, int);
1050 static boolean DigFieldByCE(int, int, int);
1051 static boolean SnapField(struct PlayerInfo *, int, int);
1052 static boolean DropElement(struct PlayerInfo *);
1053
1054 static void InitBeltMovement(void);
1055 static void CloseAllOpenTimegates(void);
1056 static void CheckGravityMovement(struct PlayerInfo *);
1057 static void CheckGravityMovementWhenNotMoving(struct PlayerInfo *);
1058 static void KillPlayerUnlessEnemyProtected(int, int);
1059 static void KillPlayerUnlessExplosionProtected(int, int);
1060
1061 static void TestIfPlayerTouchesCustomElement(int, int);
1062 static void TestIfElementTouchesCustomElement(int, int);
1063 static void TestIfElementHitsCustomElement(int, int, int);
1064
1065 static void HandleElementChange(int, int, int);
1066 static void ExecuteCustomElementAction(int, int, int, int);
1067 static boolean ChangeElement(int, int, int, int);
1068
1069 static boolean CheckTriggeredElementChangeExt(int, int, int, int, int,int,int);
1070 #define CheckTriggeredElementChange(x, y, e, ev)                        \
1071         CheckTriggeredElementChangeExt(x,y,e,ev, CH_PLAYER_ANY,CH_SIDE_ANY, -1)
1072 #define CheckTriggeredElementChangeByPlayer(x, y, e, ev, p, s)          \
1073         CheckTriggeredElementChangeExt(x, y, e, ev, p, s, -1)
1074 #define CheckTriggeredElementChangeBySide(x, y, e, ev, s)               \
1075         CheckTriggeredElementChangeExt(x, y, e, ev, CH_PLAYER_ANY, s, -1)
1076 #define CheckTriggeredElementChangeByPage(x, y, e, ev, p)               \
1077         CheckTriggeredElementChangeExt(x,y,e,ev, CH_PLAYER_ANY, CH_SIDE_ANY, p)
1078 #define CheckTriggeredElementChangeByMouse(x, y, e, ev, s)              \
1079         CheckTriggeredElementChangeExt(x, y, e, ev, CH_PLAYER_ANY, s, -1)
1080
1081 static boolean CheckElementChangeExt(int, int, int, int, int, int, int);
1082 #define CheckElementChange(x, y, e, te, ev)                             \
1083         CheckElementChangeExt(x, y, e, te, ev, CH_PLAYER_ANY, CH_SIDE_ANY)
1084 #define CheckElementChangeByPlayer(x, y, e, ev, p, s)                   \
1085         CheckElementChangeExt(x, y, e, EL_EMPTY, ev, p, s)
1086 #define CheckElementChangeBySide(x, y, e, te, ev, s)                    \
1087         CheckElementChangeExt(x, y, e, te, ev, CH_PLAYER_ANY, s)
1088 #define CheckElementChangeByMouse(x, y, e, ev, s)                       \
1089         CheckElementChangeExt(x, y, e, EL_UNDEFINED, ev, CH_PLAYER_ANY, s)
1090
1091 static void PlayLevelSound(int, int, int);
1092 static void PlayLevelSoundNearest(int, int, int);
1093 static void PlayLevelSoundAction(int, int, int);
1094 static void PlayLevelSoundElementAction(int, int, int, int);
1095 static void PlayLevelSoundElementActionIfLoop(int, int, int, int);
1096 static void PlayLevelSoundActionIfLoop(int, int, int);
1097 static void StopLevelSoundActionIfLoop(int, int, int);
1098 static void PlayLevelMusic(void);
1099 static void FadeLevelSoundsAndMusic(void);
1100
1101 static void HandleGameButtons(struct GadgetInfo *);
1102
1103 int AmoebaNeighbourNr(int, int);
1104 void AmoebaToDiamond(int, int);
1105 void ContinueMoving(int, int);
1106 void Bang(int, int);
1107 void InitMovDir(int, int);
1108 void InitAmoebaNr(int, int);
1109 void NewHighScore(int);
1110
1111 void TestIfGoodThingHitsBadThing(int, int, int);
1112 void TestIfBadThingHitsGoodThing(int, int, int);
1113 void TestIfPlayerTouchesBadThing(int, int);
1114 void TestIfPlayerRunsIntoBadThing(int, int, int);
1115 void TestIfBadThingTouchesPlayer(int, int);
1116 void TestIfBadThingRunsIntoPlayer(int, int, int);
1117 void TestIfFriendTouchesBadThing(int, int);
1118 void TestIfBadThingTouchesFriend(int, int);
1119 void TestIfBadThingTouchesOtherBadThing(int, int);
1120 void TestIfGoodThingGetsHitByBadThing(int, int, int);
1121
1122 void KillPlayer(struct PlayerInfo *);
1123 void BuryPlayer(struct PlayerInfo *);
1124 void RemovePlayer(struct PlayerInfo *);
1125 void ExitPlayer(struct PlayerInfo *);
1126
1127 static int getInvisibleActiveFromInvisibleElement(int);
1128 static int getInvisibleFromInvisibleActiveElement(int);
1129
1130 static void TestFieldAfterSnapping(int, int, int, int, int);
1131
1132 static struct GadgetInfo *game_gadget[NUM_GAME_BUTTONS];
1133
1134 // for detection of endless loops, caused by custom element programming
1135 // (using maximal playfield width x 10 is just a rough approximation)
1136 #define MAX_ELEMENT_CHANGE_RECURSION_DEPTH      (MAX_PLAYFIELD_WIDTH * 10)
1137
1138 #define RECURSION_LOOP_DETECTION_START(e, rc)                           \
1139 {                                                                       \
1140   if (recursion_loop_detected)                                          \
1141     return (rc);                                                        \
1142                                                                         \
1143   if (recursion_loop_depth > MAX_ELEMENT_CHANGE_RECURSION_DEPTH)        \
1144   {                                                                     \
1145     recursion_loop_detected = TRUE;                                     \
1146     recursion_loop_element = (e);                                       \
1147   }                                                                     \
1148                                                                         \
1149   recursion_loop_depth++;                                               \
1150 }
1151
1152 #define RECURSION_LOOP_DETECTION_END()                                  \
1153 {                                                                       \
1154   recursion_loop_depth--;                                               \
1155 }
1156
1157 static int recursion_loop_depth;
1158 static boolean recursion_loop_detected;
1159 static boolean recursion_loop_element;
1160
1161 static int map_player_action[MAX_PLAYERS];
1162
1163
1164 // ----------------------------------------------------------------------------
1165 // definition of elements that automatically change to other elements after
1166 // a specified time, eventually calling a function when changing
1167 // ----------------------------------------------------------------------------
1168
1169 // forward declaration for changer functions
1170 static void InitBuggyBase(int, int);
1171 static void WarnBuggyBase(int, int);
1172
1173 static void InitTrap(int, int);
1174 static void ActivateTrap(int, int);
1175 static void ChangeActiveTrap(int, int);
1176
1177 static void InitRobotWheel(int, int);
1178 static void RunRobotWheel(int, int);
1179 static void StopRobotWheel(int, int);
1180
1181 static void InitTimegateWheel(int, int);
1182 static void RunTimegateWheel(int, int);
1183
1184 static void InitMagicBallDelay(int, int);
1185 static void ActivateMagicBall(int, int);
1186
1187 struct ChangingElementInfo
1188 {
1189   int element;
1190   int target_element;
1191   int change_delay;
1192   void (*pre_change_function)(int x, int y);
1193   void (*change_function)(int x, int y);
1194   void (*post_change_function)(int x, int y);
1195 };
1196
1197 static struct ChangingElementInfo change_delay_list[] =
1198 {
1199   {
1200     EL_NUT_BREAKING,
1201     EL_EMERALD,
1202     6,
1203     NULL,
1204     NULL,
1205     NULL
1206   },
1207   {
1208     EL_PEARL_BREAKING,
1209     EL_EMPTY,
1210     8,
1211     NULL,
1212     NULL,
1213     NULL
1214   },
1215   {
1216     EL_EXIT_OPENING,
1217     EL_EXIT_OPEN,
1218     29,
1219     NULL,
1220     NULL,
1221     NULL
1222   },
1223   {
1224     EL_EXIT_CLOSING,
1225     EL_EXIT_CLOSED,
1226     29,
1227     NULL,
1228     NULL,
1229     NULL
1230   },
1231   {
1232     EL_STEEL_EXIT_OPENING,
1233     EL_STEEL_EXIT_OPEN,
1234     29,
1235     NULL,
1236     NULL,
1237     NULL
1238   },
1239   {
1240     EL_STEEL_EXIT_CLOSING,
1241     EL_STEEL_EXIT_CLOSED,
1242     29,
1243     NULL,
1244     NULL,
1245     NULL
1246   },
1247   {
1248     EL_EM_EXIT_OPENING,
1249     EL_EM_EXIT_OPEN,
1250     29,
1251     NULL,
1252     NULL,
1253     NULL
1254   },
1255   {
1256     EL_EM_EXIT_CLOSING,
1257     EL_EMPTY,
1258     29,
1259     NULL,
1260     NULL,
1261     NULL
1262   },
1263   {
1264     EL_EM_STEEL_EXIT_OPENING,
1265     EL_EM_STEEL_EXIT_OPEN,
1266     29,
1267     NULL,
1268     NULL,
1269     NULL
1270   },
1271   {
1272     EL_EM_STEEL_EXIT_CLOSING,
1273     EL_STEELWALL,
1274     29,
1275     NULL,
1276     NULL,
1277     NULL
1278   },
1279   {
1280     EL_SP_EXIT_OPENING,
1281     EL_SP_EXIT_OPEN,
1282     29,
1283     NULL,
1284     NULL,
1285     NULL
1286   },
1287   {
1288     EL_SP_EXIT_CLOSING,
1289     EL_SP_EXIT_CLOSED,
1290     29,
1291     NULL,
1292     NULL,
1293     NULL
1294   },
1295   {
1296     EL_SWITCHGATE_OPENING,
1297     EL_SWITCHGATE_OPEN,
1298     29,
1299     NULL,
1300     NULL,
1301     NULL
1302   },
1303   {
1304     EL_SWITCHGATE_CLOSING,
1305     EL_SWITCHGATE_CLOSED,
1306     29,
1307     NULL,
1308     NULL,
1309     NULL
1310   },
1311   {
1312     EL_TIMEGATE_OPENING,
1313     EL_TIMEGATE_OPEN,
1314     29,
1315     NULL,
1316     NULL,
1317     NULL
1318   },
1319   {
1320     EL_TIMEGATE_CLOSING,
1321     EL_TIMEGATE_CLOSED,
1322     29,
1323     NULL,
1324     NULL,
1325     NULL
1326   },
1327
1328   {
1329     EL_ACID_SPLASH_LEFT,
1330     EL_EMPTY,
1331     8,
1332     NULL,
1333     NULL,
1334     NULL
1335   },
1336   {
1337     EL_ACID_SPLASH_RIGHT,
1338     EL_EMPTY,
1339     8,
1340     NULL,
1341     NULL,
1342     NULL
1343   },
1344   {
1345     EL_SP_BUGGY_BASE,
1346     EL_SP_BUGGY_BASE_ACTIVATING,
1347     0,
1348     InitBuggyBase,
1349     NULL,
1350     NULL
1351   },
1352   {
1353     EL_SP_BUGGY_BASE_ACTIVATING,
1354     EL_SP_BUGGY_BASE_ACTIVE,
1355     0,
1356     InitBuggyBase,
1357     NULL,
1358     NULL
1359   },
1360   {
1361     EL_SP_BUGGY_BASE_ACTIVE,
1362     EL_SP_BUGGY_BASE,
1363     0,
1364     InitBuggyBase,
1365     WarnBuggyBase,
1366     NULL
1367   },
1368   {
1369     EL_TRAP,
1370     EL_TRAP_ACTIVE,
1371     0,
1372     InitTrap,
1373     NULL,
1374     ActivateTrap
1375   },
1376   {
1377     EL_TRAP_ACTIVE,
1378     EL_TRAP,
1379     31,
1380     NULL,
1381     ChangeActiveTrap,
1382     NULL
1383   },
1384   {
1385     EL_ROBOT_WHEEL_ACTIVE,
1386     EL_ROBOT_WHEEL,
1387     0,
1388     InitRobotWheel,
1389     RunRobotWheel,
1390     StopRobotWheel
1391   },
1392   {
1393     EL_TIMEGATE_SWITCH_ACTIVE,
1394     EL_TIMEGATE_SWITCH,
1395     0,
1396     InitTimegateWheel,
1397     RunTimegateWheel,
1398     NULL
1399   },
1400   {
1401     EL_DC_TIMEGATE_SWITCH_ACTIVE,
1402     EL_DC_TIMEGATE_SWITCH,
1403     0,
1404     InitTimegateWheel,
1405     RunTimegateWheel,
1406     NULL
1407   },
1408   {
1409     EL_EMC_MAGIC_BALL_ACTIVE,
1410     EL_EMC_MAGIC_BALL_ACTIVE,
1411     0,
1412     InitMagicBallDelay,
1413     NULL,
1414     ActivateMagicBall
1415   },
1416   {
1417     EL_EMC_SPRING_BUMPER_ACTIVE,
1418     EL_EMC_SPRING_BUMPER,
1419     8,
1420     NULL,
1421     NULL,
1422     NULL
1423   },
1424   {
1425     EL_DIAGONAL_SHRINKING,
1426     EL_UNDEFINED,
1427     0,
1428     NULL,
1429     NULL,
1430     NULL
1431   },
1432   {
1433     EL_DIAGONAL_GROWING,
1434     EL_UNDEFINED,
1435     0,
1436     NULL,
1437     NULL,
1438     NULL,
1439   },
1440
1441   {
1442     EL_UNDEFINED,
1443     EL_UNDEFINED,
1444     -1,
1445     NULL,
1446     NULL,
1447     NULL
1448   }
1449 };
1450
1451 struct
1452 {
1453   int element;
1454   int push_delay_fixed, push_delay_random;
1455 }
1456 push_delay_list[] =
1457 {
1458   { EL_SPRING,                  0, 0 },
1459   { EL_BALLOON,                 0, 0 },
1460
1461   { EL_SOKOBAN_OBJECT,          2, 0 },
1462   { EL_SOKOBAN_FIELD_FULL,      2, 0 },
1463   { EL_SATELLITE,               2, 0 },
1464   { EL_SP_DISK_YELLOW,          2, 0 },
1465
1466   { EL_UNDEFINED,               0, 0 },
1467 };
1468
1469 struct
1470 {
1471   int element;
1472   int move_stepsize;
1473 }
1474 move_stepsize_list[] =
1475 {
1476   { EL_AMOEBA_DROP,             2 },
1477   { EL_AMOEBA_DROPPING,         2 },
1478   { EL_QUICKSAND_FILLING,       1 },
1479   { EL_QUICKSAND_EMPTYING,      1 },
1480   { EL_QUICKSAND_FAST_FILLING,  2 },
1481   { EL_QUICKSAND_FAST_EMPTYING, 2 },
1482   { EL_MAGIC_WALL_FILLING,      2 },
1483   { EL_MAGIC_WALL_EMPTYING,     2 },
1484   { EL_BD_MAGIC_WALL_FILLING,   2 },
1485   { EL_BD_MAGIC_WALL_EMPTYING,  2 },
1486   { EL_DC_MAGIC_WALL_FILLING,   2 },
1487   { EL_DC_MAGIC_WALL_EMPTYING,  2 },
1488
1489   { EL_UNDEFINED,               0 },
1490 };
1491
1492 struct
1493 {
1494   int element;
1495   int count;
1496 }
1497 collect_count_list[] =
1498 {
1499   { EL_EMERALD,                 1 },
1500   { EL_BD_DIAMOND,              1 },
1501   { EL_EMERALD_YELLOW,          1 },
1502   { EL_EMERALD_RED,             1 },
1503   { EL_EMERALD_PURPLE,          1 },
1504   { EL_DIAMOND,                 3 },
1505   { EL_SP_INFOTRON,             1 },
1506   { EL_PEARL,                   5 },
1507   { EL_CRYSTAL,                 8 },
1508
1509   { EL_UNDEFINED,               0 },
1510 };
1511
1512 struct
1513 {
1514   int element;
1515   int direction;
1516 }
1517 access_direction_list[] =
1518 {
1519   { EL_TUBE_ANY,                        MV_LEFT | MV_RIGHT | MV_UP | MV_DOWN },
1520   { EL_TUBE_VERTICAL,                                        MV_UP | MV_DOWN },
1521   { EL_TUBE_HORIZONTAL,                 MV_LEFT | MV_RIGHT                   },
1522   { EL_TUBE_VERTICAL_LEFT,              MV_LEFT |            MV_UP | MV_DOWN },
1523   { EL_TUBE_VERTICAL_RIGHT,                       MV_RIGHT | MV_UP | MV_DOWN },
1524   { EL_TUBE_HORIZONTAL_UP,              MV_LEFT | MV_RIGHT | MV_UP           },
1525   { EL_TUBE_HORIZONTAL_DOWN,            MV_LEFT | MV_RIGHT |         MV_DOWN },
1526   { EL_TUBE_LEFT_UP,                    MV_LEFT |            MV_UP           },
1527   { EL_TUBE_LEFT_DOWN,                  MV_LEFT |                    MV_DOWN },
1528   { EL_TUBE_RIGHT_UP,                             MV_RIGHT | MV_UP           },
1529   { EL_TUBE_RIGHT_DOWN,                           MV_RIGHT |         MV_DOWN },
1530
1531   { EL_SP_PORT_LEFT,                              MV_RIGHT                   },
1532   { EL_SP_PORT_RIGHT,                   MV_LEFT                              },
1533   { EL_SP_PORT_UP,                                                   MV_DOWN },
1534   { EL_SP_PORT_DOWN,                                         MV_UP           },
1535   { EL_SP_PORT_HORIZONTAL,              MV_LEFT | MV_RIGHT                   },
1536   { EL_SP_PORT_VERTICAL,                                     MV_UP | MV_DOWN },
1537   { EL_SP_PORT_ANY,                     MV_LEFT | MV_RIGHT | MV_UP | MV_DOWN },
1538   { EL_SP_GRAVITY_PORT_LEFT,                      MV_RIGHT                   },
1539   { EL_SP_GRAVITY_PORT_RIGHT,           MV_LEFT                              },
1540   { EL_SP_GRAVITY_PORT_UP,                                           MV_DOWN },
1541   { EL_SP_GRAVITY_PORT_DOWN,                                 MV_UP           },
1542   { EL_SP_GRAVITY_ON_PORT_LEFT,                   MV_RIGHT                   },
1543   { EL_SP_GRAVITY_ON_PORT_RIGHT,        MV_LEFT                              },
1544   { EL_SP_GRAVITY_ON_PORT_UP,                                        MV_DOWN },
1545   { EL_SP_GRAVITY_ON_PORT_DOWN,                              MV_UP           },
1546   { EL_SP_GRAVITY_OFF_PORT_LEFT,                  MV_RIGHT                   },
1547   { EL_SP_GRAVITY_OFF_PORT_RIGHT,       MV_LEFT                              },
1548   { EL_SP_GRAVITY_OFF_PORT_UP,                                       MV_DOWN },
1549   { EL_SP_GRAVITY_OFF_PORT_DOWN,                             MV_UP           },
1550
1551   { EL_UNDEFINED,                       MV_NONE                              }
1552 };
1553
1554 static boolean trigger_events[MAX_NUM_ELEMENTS][NUM_CHANGE_EVENTS];
1555
1556 #define IS_AUTO_CHANGING(e)     (element_info[e].has_change_event[CE_DELAY])
1557 #define IS_JUST_CHANGING(x, y)  (ChangeDelay[x][y] != 0)
1558 #define IS_CHANGING(x, y)       (IS_AUTO_CHANGING(Tile[x][y]) || \
1559                                  IS_JUST_CHANGING(x, y))
1560
1561 #define CE_PAGE(e, ce)          (element_info[e].event_page[ce])
1562
1563 // static variables for playfield scan mode (scanning forward or backward)
1564 static int playfield_scan_start_x = 0;
1565 static int playfield_scan_start_y = 0;
1566 static int playfield_scan_delta_x = 1;
1567 static int playfield_scan_delta_y = 1;
1568
1569 #define SCAN_PLAYFIELD(x, y)    for ((y) = playfield_scan_start_y;      \
1570                                      (y) >= 0 && (y) <= lev_fieldy - 1; \
1571                                      (y) += playfield_scan_delta_y)     \
1572                                 for ((x) = playfield_scan_start_x;      \
1573                                      (x) >= 0 && (x) <= lev_fieldx - 1; \
1574                                      (x) += playfield_scan_delta_x)
1575
1576 #ifdef DEBUG
1577 void DEBUG_SetMaximumDynamite(void)
1578 {
1579   int i;
1580
1581   for (i = 0; i < MAX_INVENTORY_SIZE; i++)
1582     if (local_player->inventory_size < MAX_INVENTORY_SIZE)
1583       local_player->inventory_element[local_player->inventory_size++] =
1584         EL_DYNAMITE;
1585 }
1586 #endif
1587
1588 static void InitPlayfieldScanModeVars(void)
1589 {
1590   if (game.use_reverse_scan_direction)
1591   {
1592     playfield_scan_start_x = lev_fieldx - 1;
1593     playfield_scan_start_y = lev_fieldy - 1;
1594
1595     playfield_scan_delta_x = -1;
1596     playfield_scan_delta_y = -1;
1597   }
1598   else
1599   {
1600     playfield_scan_start_x = 0;
1601     playfield_scan_start_y = 0;
1602
1603     playfield_scan_delta_x = 1;
1604     playfield_scan_delta_y = 1;
1605   }
1606 }
1607
1608 static void InitPlayfieldScanMode(int mode)
1609 {
1610   game.use_reverse_scan_direction =
1611     (mode == CA_ARG_SCAN_MODE_REVERSE ? TRUE : FALSE);
1612
1613   InitPlayfieldScanModeVars();
1614 }
1615
1616 static int get_move_delay_from_stepsize(int move_stepsize)
1617 {
1618   move_stepsize =
1619     MIN(MAX(MOVE_STEPSIZE_MIN, move_stepsize), MOVE_STEPSIZE_MAX);
1620
1621   // make sure that stepsize value is always a power of 2
1622   move_stepsize = (1 << log_2(move_stepsize));
1623
1624   return TILEX / move_stepsize;
1625 }
1626
1627 static void SetPlayerMoveSpeed(struct PlayerInfo *player, int move_stepsize,
1628                                boolean init_game)
1629 {
1630   int player_nr = player->index_nr;
1631   int move_delay = get_move_delay_from_stepsize(move_stepsize);
1632   boolean cannot_move = (move_stepsize == STEPSIZE_NOT_MOVING ? TRUE : FALSE);
1633
1634   // do no immediately change move delay -- the player might just be moving
1635   player->move_delay_value_next = move_delay;
1636
1637   // information if player can move must be set separately
1638   player->cannot_move = cannot_move;
1639
1640   if (init_game)
1641   {
1642     player->move_delay       = game.initial_move_delay[player_nr];
1643     player->move_delay_value = game.initial_move_delay_value[player_nr];
1644
1645     player->move_delay_value_next = -1;
1646
1647     player->move_delay_reset_counter = 0;
1648   }
1649 }
1650
1651 void GetPlayerConfig(void)
1652 {
1653   GameFrameDelay = setup.game_frame_delay;
1654
1655   if (!audio.sound_available)
1656     setup.sound_simple = FALSE;
1657
1658   if (!audio.loops_available)
1659     setup.sound_loops = FALSE;
1660
1661   if (!audio.music_available)
1662     setup.sound_music = FALSE;
1663
1664   if (!video.fullscreen_available)
1665     setup.fullscreen = FALSE;
1666
1667   setup.sound = (setup.sound_simple || setup.sound_loops || setup.sound_music);
1668
1669   SetAudioMode(setup.sound);
1670 }
1671
1672 int GetElementFromGroupElement(int element)
1673 {
1674   if (IS_GROUP_ELEMENT(element))
1675   {
1676     struct ElementGroupInfo *group = element_info[element].group;
1677     int last_anim_random_frame = gfx.anim_random_frame;
1678     int element_pos;
1679
1680     if (group->choice_mode == ANIM_RANDOM)
1681       gfx.anim_random_frame = RND(group->num_elements_resolved);
1682
1683     element_pos = getAnimationFrame(group->num_elements_resolved, 1,
1684                                     group->choice_mode, 0,
1685                                     group->choice_pos);
1686
1687     if (group->choice_mode == ANIM_RANDOM)
1688       gfx.anim_random_frame = last_anim_random_frame;
1689
1690     group->choice_pos++;
1691
1692     element = group->element_resolved[element_pos];
1693   }
1694
1695   return element;
1696 }
1697
1698 static void IncrementSokobanFieldsNeeded(void)
1699 {
1700   if (level.sb_fields_needed)
1701     game.sokoban_fields_still_needed++;
1702 }
1703
1704 static void IncrementSokobanObjectsNeeded(void)
1705 {
1706   if (level.sb_objects_needed)
1707     game.sokoban_objects_still_needed++;
1708 }
1709
1710 static void DecrementSokobanFieldsNeeded(void)
1711 {
1712   if (game.sokoban_fields_still_needed > 0)
1713     game.sokoban_fields_still_needed--;
1714 }
1715
1716 static void DecrementSokobanObjectsNeeded(void)
1717 {
1718   if (game.sokoban_objects_still_needed > 0)
1719     game.sokoban_objects_still_needed--;
1720 }
1721
1722 static void InitPlayerField(int x, int y, int element, boolean init_game)
1723 {
1724   if (element == EL_SP_MURPHY)
1725   {
1726     if (init_game)
1727     {
1728       if (stored_player[0].present)
1729       {
1730         Tile[x][y] = EL_SP_MURPHY_CLONE;
1731
1732         return;
1733       }
1734       else
1735       {
1736         stored_player[0].initial_element = element;
1737         stored_player[0].use_murphy = TRUE;
1738
1739         if (!level.use_artwork_element[0])
1740           stored_player[0].artwork_element = EL_SP_MURPHY;
1741       }
1742
1743       Tile[x][y] = EL_PLAYER_1;
1744     }
1745   }
1746
1747   if (init_game)
1748   {
1749     struct PlayerInfo *player = &stored_player[Tile[x][y] - EL_PLAYER_1];
1750     int jx = player->jx, jy = player->jy;
1751
1752     player->present = TRUE;
1753
1754     player->block_last_field = (element == EL_SP_MURPHY ?
1755                                 level.sp_block_last_field :
1756                                 level.block_last_field);
1757
1758     // ---------- initialize player's last field block delay ------------------
1759
1760     // always start with reliable default value (no adjustment needed)
1761     player->block_delay_adjustment = 0;
1762
1763     // special case 1: in Supaplex, Murphy blocks last field one more frame
1764     if (player->block_last_field && element == EL_SP_MURPHY)
1765       player->block_delay_adjustment = 1;
1766
1767     // special case 2: in game engines before 3.1.1, blocking was different
1768     if (game.use_block_last_field_bug)
1769       player->block_delay_adjustment = (player->block_last_field ? -1 : 1);
1770
1771     if (!network.enabled || player->connected_network)
1772     {
1773       player->active = TRUE;
1774
1775       // remove potentially duplicate players
1776       if (StorePlayer[jx][jy] == Tile[x][y])
1777         StorePlayer[jx][jy] = 0;
1778
1779       StorePlayer[x][y] = Tile[x][y];
1780
1781 #if DEBUG_INIT_PLAYER
1782       Debug("game:init:player", "- player element %d activated",
1783             player->element_nr);
1784       Debug("game:init:player", "  (local player is %d and currently %s)",
1785             local_player->element_nr,
1786             local_player->active ? "active" : "not active");
1787     }
1788 #endif
1789
1790     Tile[x][y] = EL_EMPTY;
1791
1792     player->jx = player->last_jx = x;
1793     player->jy = player->last_jy = y;
1794   }
1795
1796   // always check if player was just killed and should be reanimated
1797   {
1798     int player_nr = GET_PLAYER_NR(element);
1799     struct PlayerInfo *player = &stored_player[player_nr];
1800
1801     if (player->active && player->killed)
1802       player->reanimated = TRUE; // if player was just killed, reanimate him
1803   }
1804 }
1805
1806 static void InitField(int x, int y, boolean init_game)
1807 {
1808   int element = Tile[x][y];
1809
1810   switch (element)
1811   {
1812     case EL_SP_MURPHY:
1813     case EL_PLAYER_1:
1814     case EL_PLAYER_2:
1815     case EL_PLAYER_3:
1816     case EL_PLAYER_4:
1817       InitPlayerField(x, y, element, init_game);
1818       break;
1819
1820     case EL_SOKOBAN_FIELD_PLAYER:
1821       element = Tile[x][y] = EL_PLAYER_1;
1822       InitField(x, y, init_game);
1823
1824       element = Tile[x][y] = EL_SOKOBAN_FIELD_EMPTY;
1825       InitField(x, y, init_game);
1826       break;
1827
1828     case EL_SOKOBAN_FIELD_EMPTY:
1829       IncrementSokobanFieldsNeeded();
1830       break;
1831
1832     case EL_SOKOBAN_OBJECT:
1833       IncrementSokobanObjectsNeeded();
1834       break;
1835
1836     case EL_STONEBLOCK:
1837       if (x < lev_fieldx-1 && Tile[x+1][y] == EL_ACID)
1838         Tile[x][y] = EL_ACID_POOL_TOPLEFT;
1839       else if (x > 0 && Tile[x-1][y] == EL_ACID)
1840         Tile[x][y] = EL_ACID_POOL_TOPRIGHT;
1841       else if (y > 0 && Tile[x][y-1] == EL_ACID_POOL_TOPLEFT)
1842         Tile[x][y] = EL_ACID_POOL_BOTTOMLEFT;
1843       else if (y > 0 && Tile[x][y-1] == EL_ACID)
1844         Tile[x][y] = EL_ACID_POOL_BOTTOM;
1845       else if (y > 0 && Tile[x][y-1] == EL_ACID_POOL_TOPRIGHT)
1846         Tile[x][y] = EL_ACID_POOL_BOTTOMRIGHT;
1847       break;
1848
1849     case EL_BUG:
1850     case EL_BUG_RIGHT:
1851     case EL_BUG_UP:
1852     case EL_BUG_LEFT:
1853     case EL_BUG_DOWN:
1854     case EL_SPACESHIP:
1855     case EL_SPACESHIP_RIGHT:
1856     case EL_SPACESHIP_UP:
1857     case EL_SPACESHIP_LEFT:
1858     case EL_SPACESHIP_DOWN:
1859     case EL_BD_BUTTERFLY:
1860     case EL_BD_BUTTERFLY_RIGHT:
1861     case EL_BD_BUTTERFLY_UP:
1862     case EL_BD_BUTTERFLY_LEFT:
1863     case EL_BD_BUTTERFLY_DOWN:
1864     case EL_BD_FIREFLY:
1865     case EL_BD_FIREFLY_RIGHT:
1866     case EL_BD_FIREFLY_UP:
1867     case EL_BD_FIREFLY_LEFT:
1868     case EL_BD_FIREFLY_DOWN:
1869     case EL_PACMAN_RIGHT:
1870     case EL_PACMAN_UP:
1871     case EL_PACMAN_LEFT:
1872     case EL_PACMAN_DOWN:
1873     case EL_YAMYAM:
1874     case EL_YAMYAM_LEFT:
1875     case EL_YAMYAM_RIGHT:
1876     case EL_YAMYAM_UP:
1877     case EL_YAMYAM_DOWN:
1878     case EL_DARK_YAMYAM:
1879     case EL_ROBOT:
1880     case EL_PACMAN:
1881     case EL_SP_SNIKSNAK:
1882     case EL_SP_ELECTRON:
1883     case EL_MOLE:
1884     case EL_MOLE_LEFT:
1885     case EL_MOLE_RIGHT:
1886     case EL_MOLE_UP:
1887     case EL_MOLE_DOWN:
1888     case EL_SPRING_LEFT:
1889     case EL_SPRING_RIGHT:
1890       InitMovDir(x, y);
1891       break;
1892
1893     case EL_AMOEBA_FULL:
1894     case EL_BD_AMOEBA:
1895       InitAmoebaNr(x, y);
1896       break;
1897
1898     case EL_AMOEBA_DROP:
1899       if (y == lev_fieldy - 1)
1900       {
1901         Tile[x][y] = EL_AMOEBA_GROWING;
1902         Store[x][y] = EL_AMOEBA_WET;
1903       }
1904       break;
1905
1906     case EL_DYNAMITE_ACTIVE:
1907     case EL_SP_DISK_RED_ACTIVE:
1908     case EL_DYNABOMB_PLAYER_1_ACTIVE:
1909     case EL_DYNABOMB_PLAYER_2_ACTIVE:
1910     case EL_DYNABOMB_PLAYER_3_ACTIVE:
1911     case EL_DYNABOMB_PLAYER_4_ACTIVE:
1912       MovDelay[x][y] = 96;
1913       break;
1914
1915     case EL_EM_DYNAMITE_ACTIVE:
1916       MovDelay[x][y] = 32;
1917       break;
1918
1919     case EL_LAMP:
1920       game.lights_still_needed++;
1921       break;
1922
1923     case EL_PENGUIN:
1924       game.friends_still_needed++;
1925       break;
1926
1927     case EL_PIG:
1928     case EL_DRAGON:
1929       GfxDir[x][y] = MovDir[x][y] = 1 << RND(4);
1930       break;
1931
1932     case EL_CONVEYOR_BELT_1_SWITCH_LEFT:
1933     case EL_CONVEYOR_BELT_1_SWITCH_MIDDLE:
1934     case EL_CONVEYOR_BELT_1_SWITCH_RIGHT:
1935     case EL_CONVEYOR_BELT_2_SWITCH_LEFT:
1936     case EL_CONVEYOR_BELT_2_SWITCH_MIDDLE:
1937     case EL_CONVEYOR_BELT_2_SWITCH_RIGHT:
1938     case EL_CONVEYOR_BELT_3_SWITCH_LEFT:
1939     case EL_CONVEYOR_BELT_3_SWITCH_MIDDLE:
1940     case EL_CONVEYOR_BELT_3_SWITCH_RIGHT:
1941     case EL_CONVEYOR_BELT_4_SWITCH_LEFT:
1942     case EL_CONVEYOR_BELT_4_SWITCH_MIDDLE:
1943     case EL_CONVEYOR_BELT_4_SWITCH_RIGHT:
1944       if (init_game)
1945       {
1946         int belt_nr = getBeltNrFromBeltSwitchElement(Tile[x][y]);
1947         int belt_dir = getBeltDirFromBeltSwitchElement(Tile[x][y]);
1948         int belt_dir_nr = getBeltDirNrFromBeltSwitchElement(Tile[x][y]);
1949
1950         if (game.belt_dir_nr[belt_nr] == 3)     // initial value
1951         {
1952           game.belt_dir[belt_nr] = belt_dir;
1953           game.belt_dir_nr[belt_nr] = belt_dir_nr;
1954         }
1955         else    // more than one switch -- set it like the first switch
1956         {
1957           Tile[x][y] = Tile[x][y] - belt_dir_nr + game.belt_dir_nr[belt_nr];
1958         }
1959       }
1960       break;
1961
1962     case EL_LIGHT_SWITCH_ACTIVE:
1963       if (init_game)
1964         game.light_time_left = level.time_light * FRAMES_PER_SECOND;
1965       break;
1966
1967     case EL_INVISIBLE_STEELWALL:
1968     case EL_INVISIBLE_WALL:
1969     case EL_INVISIBLE_SAND:
1970       if (game.light_time_left > 0 ||
1971           game.lenses_time_left > 0)
1972         Tile[x][y] = getInvisibleActiveFromInvisibleElement(element);
1973       break;
1974
1975     case EL_EMC_MAGIC_BALL:
1976       if (game.ball_active)
1977         Tile[x][y] = EL_EMC_MAGIC_BALL_ACTIVE;
1978       break;
1979
1980     case EL_EMC_MAGIC_BALL_SWITCH:
1981       if (game.ball_active)
1982         Tile[x][y] = EL_EMC_MAGIC_BALL_SWITCH_ACTIVE;
1983       break;
1984
1985     case EL_TRIGGER_PLAYER:
1986     case EL_TRIGGER_ELEMENT:
1987     case EL_TRIGGER_CE_VALUE:
1988     case EL_TRIGGER_CE_SCORE:
1989     case EL_SELF:
1990     case EL_ANY_ELEMENT:
1991     case EL_CURRENT_CE_VALUE:
1992     case EL_CURRENT_CE_SCORE:
1993     case EL_PREV_CE_1:
1994     case EL_PREV_CE_2:
1995     case EL_PREV_CE_3:
1996     case EL_PREV_CE_4:
1997     case EL_PREV_CE_5:
1998     case EL_PREV_CE_6:
1999     case EL_PREV_CE_7:
2000     case EL_PREV_CE_8:
2001     case EL_NEXT_CE_1:
2002     case EL_NEXT_CE_2:
2003     case EL_NEXT_CE_3:
2004     case EL_NEXT_CE_4:
2005     case EL_NEXT_CE_5:
2006     case EL_NEXT_CE_6:
2007     case EL_NEXT_CE_7:
2008     case EL_NEXT_CE_8:
2009       // reference elements should not be used on the playfield
2010       Tile[x][y] = EL_EMPTY;
2011       break;
2012
2013     default:
2014       if (IS_CUSTOM_ELEMENT(element))
2015       {
2016         if (CAN_MOVE(element))
2017           InitMovDir(x, y);
2018
2019         if (!element_info[element].use_last_ce_value || init_game)
2020           CustomValue[x][y] = GET_NEW_CE_VALUE(Tile[x][y]);
2021       }
2022       else if (IS_GROUP_ELEMENT(element))
2023       {
2024         Tile[x][y] = GetElementFromGroupElement(element);
2025
2026         InitField(x, y, init_game);
2027       }
2028
2029       break;
2030   }
2031
2032   if (!init_game)
2033     CheckTriggeredElementChange(x, y, element, CE_CREATION_OF_X);
2034 }
2035
2036 static void InitField_WithBug1(int x, int y, boolean init_game)
2037 {
2038   InitField(x, y, init_game);
2039
2040   // not needed to call InitMovDir() -- already done by InitField()!
2041   if (game.engine_version < VERSION_IDENT(3,1,0,0) &&
2042       CAN_MOVE(Tile[x][y]))
2043     InitMovDir(x, y);
2044 }
2045
2046 static void InitField_WithBug2(int x, int y, boolean init_game)
2047 {
2048   int old_element = Tile[x][y];
2049
2050   InitField(x, y, init_game);
2051
2052   // not needed to call InitMovDir() -- already done by InitField()!
2053   if (game.engine_version < VERSION_IDENT(3,1,0,0) &&
2054       CAN_MOVE(old_element) &&
2055       (old_element < EL_MOLE_LEFT || old_element > EL_MOLE_DOWN))
2056     InitMovDir(x, y);
2057
2058   /* this case is in fact a combination of not less than three bugs:
2059      first, it calls InitMovDir() for elements that can move, although this is
2060      already done by InitField(); then, it checks the element that was at this
2061      field _before_ the call to InitField() (which can change it); lastly, it
2062      was not called for "mole with direction" elements, which were treated as
2063      "cannot move" due to (fixed) wrong element initialization in "src/init.c"
2064   */
2065 }
2066
2067 static int get_key_element_from_nr(int key_nr)
2068 {
2069   int key_base_element = (key_nr >= STD_NUM_KEYS ? EL_EMC_KEY_5 - STD_NUM_KEYS :
2070                           level.game_engine_type == GAME_ENGINE_TYPE_EM ?
2071                           EL_EM_KEY_1 : EL_KEY_1);
2072
2073   return key_base_element + key_nr;
2074 }
2075
2076 static int get_next_dropped_element(struct PlayerInfo *player)
2077 {
2078   return (player->inventory_size > 0 ?
2079           player->inventory_element[player->inventory_size - 1] :
2080           player->inventory_infinite_element != EL_UNDEFINED ?
2081           player->inventory_infinite_element :
2082           player->dynabombs_left > 0 ?
2083           EL_DYNABOMB_PLAYER_1_ACTIVE + player->index_nr :
2084           EL_UNDEFINED);
2085 }
2086
2087 static int get_inventory_element_from_pos(struct PlayerInfo *player, int pos)
2088 {
2089   // pos >= 0: get element from bottom of the stack;
2090   // pos <  0: get element from top of the stack
2091
2092   if (pos < 0)
2093   {
2094     int min_inventory_size = -pos;
2095     int inventory_pos = player->inventory_size - min_inventory_size;
2096     int min_dynabombs_left = min_inventory_size - player->inventory_size;
2097
2098     return (player->inventory_size >= min_inventory_size ?
2099             player->inventory_element[inventory_pos] :
2100             player->inventory_infinite_element != EL_UNDEFINED ?
2101             player->inventory_infinite_element :
2102             player->dynabombs_left >= min_dynabombs_left ?
2103             EL_DYNABOMB_PLAYER_1 + player->index_nr :
2104             EL_UNDEFINED);
2105   }
2106   else
2107   {
2108     int min_dynabombs_left = pos + 1;
2109     int min_inventory_size = pos + 1 - player->dynabombs_left;
2110     int inventory_pos = pos - player->dynabombs_left;
2111
2112     return (player->inventory_infinite_element != EL_UNDEFINED ?
2113             player->inventory_infinite_element :
2114             player->dynabombs_left >= min_dynabombs_left ?
2115             EL_DYNABOMB_PLAYER_1 + player->index_nr :
2116             player->inventory_size >= min_inventory_size ?
2117             player->inventory_element[inventory_pos] :
2118             EL_UNDEFINED);
2119   }
2120 }
2121
2122 static int compareGamePanelOrderInfo(const void *object1, const void *object2)
2123 {
2124   const struct GamePanelOrderInfo *gpo1 = (struct GamePanelOrderInfo *)object1;
2125   const struct GamePanelOrderInfo *gpo2 = (struct GamePanelOrderInfo *)object2;
2126   int compare_result;
2127
2128   if (gpo1->sort_priority != gpo2->sort_priority)
2129     compare_result = gpo1->sort_priority - gpo2->sort_priority;
2130   else
2131     compare_result = gpo1->nr - gpo2->nr;
2132
2133   return compare_result;
2134 }
2135
2136 int getPlayerInventorySize(int player_nr)
2137 {
2138   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
2139     return game_em.ply[player_nr]->dynamite;
2140   else if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
2141     return game_sp.red_disk_count;
2142   else
2143     return stored_player[player_nr].inventory_size;
2144 }
2145
2146 static void InitGameControlValues(void)
2147 {
2148   int i;
2149
2150   for (i = 0; game_panel_controls[i].nr != -1; i++)
2151   {
2152     struct GamePanelControlInfo *gpc = &game_panel_controls[i];
2153     struct GamePanelOrderInfo *gpo = &game_panel_order[i];
2154     struct TextPosInfo *pos = gpc->pos;
2155     int nr = gpc->nr;
2156     int type = gpc->type;
2157
2158     if (nr != i)
2159     {
2160       Error("'game_panel_controls' structure corrupted at %d", i);
2161
2162       Fail("this should not happen -- please debug");
2163     }
2164
2165     // force update of game controls after initialization
2166     gpc->value = gpc->last_value = -1;
2167     gpc->frame = gpc->last_frame = -1;
2168     gpc->gfx_frame = -1;
2169
2170     // determine panel value width for later calculation of alignment
2171     if (type == TYPE_INTEGER || type == TYPE_STRING)
2172     {
2173       pos->width = pos->size * getFontWidth(pos->font);
2174       pos->height = getFontHeight(pos->font);
2175     }
2176     else if (type == TYPE_ELEMENT)
2177     {
2178       pos->width = pos->size;
2179       pos->height = pos->size;
2180     }
2181
2182     // fill structure for game panel draw order
2183     gpo->nr = gpc->nr;
2184     gpo->sort_priority = pos->sort_priority;
2185   }
2186
2187   // sort game panel controls according to sort_priority and control number
2188   qsort(game_panel_order, NUM_GAME_PANEL_CONTROLS,
2189         sizeof(struct GamePanelOrderInfo), compareGamePanelOrderInfo);
2190 }
2191
2192 static void UpdatePlayfieldElementCount(void)
2193 {
2194   boolean use_element_count = FALSE;
2195   int i, j, x, y;
2196
2197   // first check if it is needed at all to calculate playfield element count
2198   for (i = GAME_PANEL_ELEMENT_COUNT_1; i <= GAME_PANEL_ELEMENT_COUNT_8; i++)
2199     if (!PANEL_DEACTIVATED(game_panel_controls[i].pos))
2200       use_element_count = TRUE;
2201
2202   if (!use_element_count)
2203     return;
2204
2205   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
2206     element_info[i].element_count = 0;
2207
2208   SCAN_PLAYFIELD(x, y)
2209   {
2210     element_info[Tile[x][y]].element_count++;
2211   }
2212
2213   for (i = 0; i < NUM_GROUP_ELEMENTS; i++)
2214     for (j = 0; j < MAX_NUM_ELEMENTS; j++)
2215       if (IS_IN_GROUP(j, i))
2216         element_info[EL_GROUP_START + i].element_count +=
2217           element_info[j].element_count;
2218 }
2219
2220 static void UpdateGameControlValues(void)
2221 {
2222   int i, k;
2223   int time = (game.LevelSolved ?
2224               game.LevelSolved_CountingTime :
2225               level.game_engine_type == GAME_ENGINE_TYPE_EM ?
2226               game_em.lev->time :
2227               level.game_engine_type == GAME_ENGINE_TYPE_SP ?
2228               game_sp.time_played :
2229               level.game_engine_type == GAME_ENGINE_TYPE_MM ?
2230               game_mm.energy_left :
2231               game.no_time_limit ? TimePlayed : TimeLeft);
2232   int score = (game.LevelSolved ?
2233                game.LevelSolved_CountingScore :
2234                level.game_engine_type == GAME_ENGINE_TYPE_EM ?
2235                game_em.lev->score :
2236                level.game_engine_type == GAME_ENGINE_TYPE_SP ?
2237                game_sp.score :
2238                level.game_engine_type == GAME_ENGINE_TYPE_MM ?
2239                game_mm.score :
2240                game.score);
2241   int gems = (level.game_engine_type == GAME_ENGINE_TYPE_EM ?
2242               game_em.lev->gems_needed :
2243               level.game_engine_type == GAME_ENGINE_TYPE_SP ?
2244               game_sp.infotrons_still_needed :
2245               level.game_engine_type == GAME_ENGINE_TYPE_MM ?
2246               game_mm.kettles_still_needed :
2247               game.gems_still_needed);
2248   int exit_closed = (level.game_engine_type == GAME_ENGINE_TYPE_EM ?
2249                      game_em.lev->gems_needed > 0 :
2250                      level.game_engine_type == GAME_ENGINE_TYPE_SP ?
2251                      game_sp.infotrons_still_needed > 0 :
2252                      level.game_engine_type == GAME_ENGINE_TYPE_MM ?
2253                      game_mm.kettles_still_needed > 0 ||
2254                      game_mm.lights_still_needed > 0 :
2255                      game.gems_still_needed > 0 ||
2256                      game.sokoban_fields_still_needed > 0 ||
2257                      game.sokoban_objects_still_needed > 0 ||
2258                      game.lights_still_needed > 0);
2259   int health = (game.LevelSolved ?
2260                 game.LevelSolved_CountingHealth :
2261                 level.game_engine_type == GAME_ENGINE_TYPE_MM ?
2262                 MM_HEALTH(game_mm.laser_overload_value) :
2263                 game.health);
2264   int sync_random_frame = INIT_GFX_RANDOM();    // random, but synchronized
2265
2266   UpdatePlayfieldElementCount();
2267
2268   // update game panel control values
2269
2270   // used instead of "level_nr" (for network games)
2271   game_panel_controls[GAME_PANEL_LEVEL_NUMBER].value = levelset.level_nr;
2272   game_panel_controls[GAME_PANEL_GEMS].value = gems;
2273
2274   game_panel_controls[GAME_PANEL_INVENTORY_COUNT].value = 0;
2275   for (i = 0; i < MAX_NUM_KEYS; i++)
2276     game_panel_controls[GAME_PANEL_KEY_1 + i].value = EL_EMPTY;
2277   game_panel_controls[GAME_PANEL_KEY_WHITE].value = EL_EMPTY;
2278   game_panel_controls[GAME_PANEL_KEY_WHITE_COUNT].value = 0;
2279
2280   if (game.centered_player_nr == -1)
2281   {
2282     for (i = 0; i < MAX_PLAYERS; i++)
2283     {
2284       // only one player in Supaplex game engine
2285       if (level.game_engine_type == GAME_ENGINE_TYPE_SP && i > 0)
2286         break;
2287
2288       for (k = 0; k < MAX_NUM_KEYS; k++)
2289       {
2290         if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
2291         {
2292           if (game_em.ply[i]->keys & (1 << k))
2293             game_panel_controls[GAME_PANEL_KEY_1 + k].value =
2294               get_key_element_from_nr(k);
2295         }
2296         else if (stored_player[i].key[k])
2297           game_panel_controls[GAME_PANEL_KEY_1 + k].value =
2298             get_key_element_from_nr(k);
2299       }
2300
2301       game_panel_controls[GAME_PANEL_INVENTORY_COUNT].value +=
2302         getPlayerInventorySize(i);
2303
2304       if (stored_player[i].num_white_keys > 0)
2305         game_panel_controls[GAME_PANEL_KEY_WHITE].value =
2306           EL_DC_KEY_WHITE;
2307
2308       game_panel_controls[GAME_PANEL_KEY_WHITE_COUNT].value +=
2309         stored_player[i].num_white_keys;
2310     }
2311   }
2312   else
2313   {
2314     int player_nr = game.centered_player_nr;
2315
2316     for (k = 0; k < MAX_NUM_KEYS; k++)
2317     {
2318       if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
2319       {
2320         if (game_em.ply[player_nr]->keys & (1 << k))
2321           game_panel_controls[GAME_PANEL_KEY_1 + k].value =
2322             get_key_element_from_nr(k);
2323       }
2324       else if (stored_player[player_nr].key[k])
2325         game_panel_controls[GAME_PANEL_KEY_1 + k].value =
2326           get_key_element_from_nr(k);
2327     }
2328
2329     game_panel_controls[GAME_PANEL_INVENTORY_COUNT].value +=
2330       getPlayerInventorySize(player_nr);
2331
2332     if (stored_player[player_nr].num_white_keys > 0)
2333       game_panel_controls[GAME_PANEL_KEY_WHITE].value = EL_DC_KEY_WHITE;
2334
2335     game_panel_controls[GAME_PANEL_KEY_WHITE_COUNT].value +=
2336       stored_player[player_nr].num_white_keys;
2337   }
2338
2339   // re-arrange keys on game panel, if needed or if defined by style settings
2340   for (i = 0; i < MAX_NUM_KEYS + 1; i++)        // all normal keys + white key
2341   {
2342     int nr = GAME_PANEL_KEY_1 + i;
2343     struct GamePanelControlInfo *gpc = &game_panel_controls[nr];
2344     struct TextPosInfo *pos = gpc->pos;
2345
2346     // skip check if key is not in the player's inventory
2347     if (gpc->value == EL_EMPTY)
2348       continue;
2349
2350     // check if keys should be arranged on panel from left to right
2351     if (pos->style == STYLE_LEFTMOST_POSITION)
2352     {
2353       // check previous key positions (left from current key)
2354       for (k = 0; k < i; k++)
2355       {
2356         int nr_new = GAME_PANEL_KEY_1 + k;
2357
2358         if (game_panel_controls[nr_new].value == EL_EMPTY)
2359         {
2360           game_panel_controls[nr_new].value = gpc->value;
2361           gpc->value = EL_EMPTY;
2362
2363           break;
2364         }
2365       }
2366     }
2367
2368     // check if "undefined" keys can be placed at some other position
2369     if (pos->x == -1 && pos->y == -1)
2370     {
2371       int nr_new = GAME_PANEL_KEY_1 + i % STD_NUM_KEYS;
2372
2373       // 1st try: display key at the same position as normal or EM keys
2374       if (game_panel_controls[nr_new].value == EL_EMPTY)
2375       {
2376         game_panel_controls[nr_new].value = gpc->value;
2377       }
2378       else
2379       {
2380         // 2nd try: display key at the next free position in the key panel
2381         for (k = 0; k < STD_NUM_KEYS; k++)
2382         {
2383           nr_new = GAME_PANEL_KEY_1 + k;
2384
2385           if (game_panel_controls[nr_new].value == EL_EMPTY)
2386           {
2387             game_panel_controls[nr_new].value = gpc->value;
2388
2389             break;
2390           }
2391         }
2392       }
2393     }
2394   }
2395
2396   for (i = 0; i < NUM_PANEL_INVENTORY; i++)
2397   {
2398     game_panel_controls[GAME_PANEL_INVENTORY_FIRST_1 + i].value =
2399       get_inventory_element_from_pos(local_player, i);
2400     game_panel_controls[GAME_PANEL_INVENTORY_LAST_1 + i].value =
2401       get_inventory_element_from_pos(local_player, -i - 1);
2402   }
2403
2404   game_panel_controls[GAME_PANEL_SCORE].value = score;
2405   game_panel_controls[GAME_PANEL_HIGHSCORE].value = scores.entry[0].score;
2406
2407   game_panel_controls[GAME_PANEL_TIME].value = time;
2408
2409   game_panel_controls[GAME_PANEL_TIME_HH].value = time / 3600;
2410   game_panel_controls[GAME_PANEL_TIME_MM].value = (time / 60) % 60;
2411   game_panel_controls[GAME_PANEL_TIME_SS].value = time % 60;
2412
2413   if (level.time == 0)
2414     game_panel_controls[GAME_PANEL_TIME_ANIM].value = 100;
2415   else
2416     game_panel_controls[GAME_PANEL_TIME_ANIM].value = time * 100 / level.time;
2417
2418   game_panel_controls[GAME_PANEL_HEALTH].value = health;
2419   game_panel_controls[GAME_PANEL_HEALTH_ANIM].value = health;
2420
2421   game_panel_controls[GAME_PANEL_FRAME].value = FrameCounter;
2422
2423   game_panel_controls[GAME_PANEL_SHIELD_NORMAL].value =
2424     (local_player->shield_normal_time_left > 0 ? EL_SHIELD_NORMAL_ACTIVE :
2425      EL_EMPTY);
2426   game_panel_controls[GAME_PANEL_SHIELD_NORMAL_TIME].value =
2427     local_player->shield_normal_time_left;
2428   game_panel_controls[GAME_PANEL_SHIELD_DEADLY].value =
2429     (local_player->shield_deadly_time_left > 0 ? EL_SHIELD_DEADLY_ACTIVE :
2430      EL_EMPTY);
2431   game_panel_controls[GAME_PANEL_SHIELD_DEADLY_TIME].value =
2432     local_player->shield_deadly_time_left;
2433
2434   game_panel_controls[GAME_PANEL_EXIT].value =
2435     (exit_closed ? EL_EXIT_CLOSED : EL_EXIT_OPEN);
2436
2437   game_panel_controls[GAME_PANEL_EMC_MAGIC_BALL].value =
2438     (game.ball_active ? EL_EMC_MAGIC_BALL_ACTIVE : EL_EMC_MAGIC_BALL);
2439   game_panel_controls[GAME_PANEL_EMC_MAGIC_BALL_SWITCH].value =
2440     (game.ball_active ? EL_EMC_MAGIC_BALL_SWITCH_ACTIVE :
2441      EL_EMC_MAGIC_BALL_SWITCH);
2442
2443   game_panel_controls[GAME_PANEL_LIGHT_SWITCH].value =
2444     (game.light_time_left > 0 ? EL_LIGHT_SWITCH_ACTIVE : EL_LIGHT_SWITCH);
2445   game_panel_controls[GAME_PANEL_LIGHT_SWITCH_TIME].value =
2446     game.light_time_left;
2447
2448   game_panel_controls[GAME_PANEL_TIMEGATE_SWITCH].value =
2449     (game.timegate_time_left > 0 ? EL_TIMEGATE_OPEN : EL_TIMEGATE_CLOSED);
2450   game_panel_controls[GAME_PANEL_TIMEGATE_SWITCH_TIME].value =
2451     game.timegate_time_left;
2452
2453   game_panel_controls[GAME_PANEL_SWITCHGATE_SWITCH].value =
2454     EL_SWITCHGATE_SWITCH_UP + game.switchgate_pos;
2455
2456   game_panel_controls[GAME_PANEL_EMC_LENSES].value =
2457     (game.lenses_time_left > 0 ? EL_EMC_LENSES : EL_EMPTY);
2458   game_panel_controls[GAME_PANEL_EMC_LENSES_TIME].value =
2459     game.lenses_time_left;
2460
2461   game_panel_controls[GAME_PANEL_EMC_MAGNIFIER].value =
2462     (game.magnify_time_left > 0 ? EL_EMC_MAGNIFIER : EL_EMPTY);
2463   game_panel_controls[GAME_PANEL_EMC_MAGNIFIER_TIME].value =
2464     game.magnify_time_left;
2465
2466   game_panel_controls[GAME_PANEL_BALLOON_SWITCH].value =
2467     (game.wind_direction == MV_LEFT  ? EL_BALLOON_SWITCH_LEFT  :
2468      game.wind_direction == MV_RIGHT ? EL_BALLOON_SWITCH_RIGHT :
2469      game.wind_direction == MV_UP    ? EL_BALLOON_SWITCH_UP    :
2470      game.wind_direction == MV_DOWN  ? EL_BALLOON_SWITCH_DOWN  :
2471      EL_BALLOON_SWITCH_NONE);
2472
2473   game_panel_controls[GAME_PANEL_DYNABOMB_NUMBER].value =
2474     local_player->dynabomb_count;
2475   game_panel_controls[GAME_PANEL_DYNABOMB_SIZE].value =
2476     local_player->dynabomb_size;
2477   game_panel_controls[GAME_PANEL_DYNABOMB_POWER].value =
2478     (local_player->dynabomb_xl ? EL_DYNABOMB_INCREASE_POWER : EL_EMPTY);
2479
2480   game_panel_controls[GAME_PANEL_PENGUINS].value =
2481     game.friends_still_needed;
2482
2483   game_panel_controls[GAME_PANEL_SOKOBAN_OBJECTS].value =
2484     game.sokoban_objects_still_needed;
2485   game_panel_controls[GAME_PANEL_SOKOBAN_FIELDS].value =
2486     game.sokoban_fields_still_needed;
2487
2488   game_panel_controls[GAME_PANEL_ROBOT_WHEEL].value =
2489     (game.robot_wheel_active ? EL_ROBOT_WHEEL_ACTIVE : EL_ROBOT_WHEEL);
2490
2491   for (i = 0; i < NUM_BELTS; i++)
2492   {
2493     game_panel_controls[GAME_PANEL_CONVEYOR_BELT_1 + i].value =
2494       (game.belt_dir[i] != MV_NONE ? EL_CONVEYOR_BELT_1_MIDDLE_ACTIVE :
2495        EL_CONVEYOR_BELT_1_MIDDLE) + i;
2496     game_panel_controls[GAME_PANEL_CONVEYOR_BELT_1_SWITCH + i].value =
2497       getBeltSwitchElementFromBeltNrAndBeltDir(i, game.belt_dir[i]);
2498   }
2499
2500   game_panel_controls[GAME_PANEL_MAGIC_WALL].value =
2501     (game.magic_wall_active ? EL_MAGIC_WALL_ACTIVE : EL_MAGIC_WALL);
2502   game_panel_controls[GAME_PANEL_MAGIC_WALL_TIME].value =
2503     game.magic_wall_time_left;
2504
2505   game_panel_controls[GAME_PANEL_GRAVITY_STATE].value =
2506     local_player->gravity;
2507
2508   for (i = 0; i < NUM_PANEL_GRAPHICS; i++)
2509     game_panel_controls[GAME_PANEL_GRAPHIC_1 + i].value = EL_GRAPHIC_1 + i;
2510
2511   for (i = 0; i < NUM_PANEL_ELEMENTS; i++)
2512     game_panel_controls[GAME_PANEL_ELEMENT_1 + i].value =
2513       (IS_DRAWABLE_ELEMENT(game.panel.element[i].id) ?
2514        game.panel.element[i].id : EL_UNDEFINED);
2515
2516   for (i = 0; i < NUM_PANEL_ELEMENTS; i++)
2517     game_panel_controls[GAME_PANEL_ELEMENT_COUNT_1 + i].value =
2518       (IS_VALID_ELEMENT(game.panel.element_count[i].id) ?
2519        element_info[game.panel.element_count[i].id].element_count : 0);
2520
2521   for (i = 0; i < NUM_PANEL_CE_SCORE; i++)
2522     game_panel_controls[GAME_PANEL_CE_SCORE_1 + i].value =
2523       (IS_CUSTOM_ELEMENT(game.panel.ce_score[i].id) ?
2524        element_info[game.panel.ce_score[i].id].collect_score : 0);
2525
2526   for (i = 0; i < NUM_PANEL_CE_SCORE; i++)
2527     game_panel_controls[GAME_PANEL_CE_SCORE_1_ELEMENT + i].value =
2528       (IS_CUSTOM_ELEMENT(game.panel.ce_score_element[i].id) ?
2529        element_info[game.panel.ce_score_element[i].id].collect_score :
2530        EL_UNDEFINED);
2531
2532   game_panel_controls[GAME_PANEL_PLAYER_NAME].value = 0;
2533   game_panel_controls[GAME_PANEL_LEVEL_NAME].value = 0;
2534   game_panel_controls[GAME_PANEL_LEVEL_AUTHOR].value = 0;
2535
2536   // update game panel control frames
2537
2538   for (i = 0; game_panel_controls[i].nr != -1; i++)
2539   {
2540     struct GamePanelControlInfo *gpc = &game_panel_controls[i];
2541
2542     if (gpc->type == TYPE_ELEMENT)
2543     {
2544       if (gpc->value != EL_UNDEFINED && gpc->value != EL_EMPTY)
2545       {
2546         int last_anim_random_frame = gfx.anim_random_frame;
2547         int element = gpc->value;
2548         int graphic = el2panelimg(element);
2549         int init_gfx_random = (graphic_info[graphic].anim_global_sync ?
2550                                sync_random_frame : INIT_GFX_RANDOM());
2551
2552         if (gpc->value != gpc->last_value)
2553         {
2554           gpc->gfx_frame = 0;
2555           gpc->gfx_random = init_gfx_random;
2556         }
2557         else
2558         {
2559           gpc->gfx_frame++;
2560
2561           if (ANIM_MODE(graphic) == ANIM_RANDOM &&
2562               IS_NEXT_FRAME(gpc->gfx_frame, graphic))
2563             gpc->gfx_random = init_gfx_random;
2564         }
2565
2566         if (ANIM_MODE(graphic) == ANIM_RANDOM)
2567           gfx.anim_random_frame = gpc->gfx_random;
2568
2569         if (ANIM_MODE(graphic) == ANIM_CE_SCORE)
2570           gpc->gfx_frame = element_info[element].collect_score;
2571
2572         gpc->frame = getGraphicAnimationFrame(graphic, gpc->gfx_frame);
2573
2574         if (ANIM_MODE(graphic) == ANIM_RANDOM)
2575           gfx.anim_random_frame = last_anim_random_frame;
2576       }
2577     }
2578     else if (gpc->type == TYPE_GRAPHIC)
2579     {
2580       if (gpc->graphic != IMG_UNDEFINED)
2581       {
2582         int last_anim_random_frame = gfx.anim_random_frame;
2583         int graphic = gpc->graphic;
2584         int init_gfx_random = (graphic_info[graphic].anim_global_sync ?
2585                                sync_random_frame : INIT_GFX_RANDOM());
2586
2587         if (gpc->value != gpc->last_value)
2588         {
2589           gpc->gfx_frame = 0;
2590           gpc->gfx_random = init_gfx_random;
2591         }
2592         else
2593         {
2594           gpc->gfx_frame++;
2595
2596           if (ANIM_MODE(graphic) == ANIM_RANDOM &&
2597               IS_NEXT_FRAME(gpc->gfx_frame, graphic))
2598             gpc->gfx_random = init_gfx_random;
2599         }
2600
2601         if (ANIM_MODE(graphic) == ANIM_RANDOM)
2602           gfx.anim_random_frame = gpc->gfx_random;
2603
2604         gpc->frame = getGraphicAnimationFrame(graphic, gpc->gfx_frame);
2605
2606         if (ANIM_MODE(graphic) == ANIM_RANDOM)
2607           gfx.anim_random_frame = last_anim_random_frame;
2608       }
2609     }
2610   }
2611 }
2612
2613 static void DisplayGameControlValues(void)
2614 {
2615   boolean redraw_panel = FALSE;
2616   int i;
2617
2618   for (i = 0; game_panel_controls[i].nr != -1; i++)
2619   {
2620     struct GamePanelControlInfo *gpc = &game_panel_controls[i];
2621
2622     if (PANEL_DEACTIVATED(gpc->pos))
2623       continue;
2624
2625     if (gpc->value == gpc->last_value &&
2626         gpc->frame == gpc->last_frame)
2627       continue;
2628
2629     redraw_panel = TRUE;
2630   }
2631
2632   if (!redraw_panel)
2633     return;
2634
2635   // copy default game door content to main double buffer
2636
2637   // !!! CHECK AGAIN !!!
2638   SetPanelBackground();
2639   // SetDoorBackgroundImage(IMG_BACKGROUND_PANEL);
2640   DrawBackground(DX, DY, DXSIZE, DYSIZE);
2641
2642   // redraw game control buttons
2643   RedrawGameButtons();
2644
2645   SetGameStatus(GAME_MODE_PSEUDO_PANEL);
2646
2647   for (i = 0; i < NUM_GAME_PANEL_CONTROLS; i++)
2648   {
2649     int nr = game_panel_order[i].nr;
2650     struct GamePanelControlInfo *gpc = &game_panel_controls[nr];
2651     struct TextPosInfo *pos = gpc->pos;
2652     int type = gpc->type;
2653     int value = gpc->value;
2654     int frame = gpc->frame;
2655     int size = pos->size;
2656     int font = pos->font;
2657     boolean draw_masked = pos->draw_masked;
2658     int mask_mode = (draw_masked ? BLIT_MASKED : BLIT_OPAQUE);
2659
2660     if (PANEL_DEACTIVATED(pos))
2661       continue;
2662
2663     if (pos->class == get_hash_from_key("extra_panel_items") &&
2664         !setup.prefer_extra_panel_items)
2665       continue;
2666
2667     gpc->last_value = value;
2668     gpc->last_frame = frame;
2669
2670     if (type == TYPE_INTEGER)
2671     {
2672       if (nr == GAME_PANEL_LEVEL_NUMBER ||
2673           nr == GAME_PANEL_TIME)
2674       {
2675         boolean use_dynamic_size = (size == -1 ? TRUE : FALSE);
2676
2677         if (use_dynamic_size)           // use dynamic number of digits
2678         {
2679           int value_change = (nr == GAME_PANEL_LEVEL_NUMBER ? 100 : 1000);
2680           int size1 = (nr == GAME_PANEL_LEVEL_NUMBER ? 2 : 3);
2681           int size2 = size1 + 1;
2682           int font1 = pos->font;
2683           int font2 = pos->font_alt;
2684
2685           size = (value < value_change ? size1 : size2);
2686           font = (value < value_change ? font1 : font2);
2687         }
2688       }
2689
2690       // correct text size if "digits" is zero or less
2691       if (size <= 0)
2692         size = strlen(int2str(value, size));
2693
2694       // dynamically correct text alignment
2695       pos->width = size * getFontWidth(font);
2696
2697       DrawTextExt(drawto, PANEL_XPOS(pos), PANEL_YPOS(pos),
2698                   int2str(value, size), font, mask_mode);
2699     }
2700     else if (type == TYPE_ELEMENT)
2701     {
2702       int element, graphic;
2703       Bitmap *src_bitmap;
2704       int src_x, src_y;
2705       int width, height;
2706       int dst_x = PANEL_XPOS(pos);
2707       int dst_y = PANEL_YPOS(pos);
2708
2709       if (value != EL_UNDEFINED && value != EL_EMPTY)
2710       {
2711         element = value;
2712         graphic = el2panelimg(value);
2713
2714 #if 0
2715         Debug("game:DisplayGameControlValues", "%d, '%s' [%d]",
2716               element, EL_NAME(element), size);
2717 #endif
2718
2719         if (element >= EL_GRAPHIC_1 && element <= EL_GRAPHIC_8 && size == 0)
2720           size = TILESIZE;
2721
2722         getSizedGraphicSource(graphic, frame, size, &src_bitmap,
2723                               &src_x, &src_y);
2724
2725         width  = graphic_info[graphic].width  * size / TILESIZE;
2726         height = graphic_info[graphic].height * size / TILESIZE;
2727
2728         if (draw_masked)
2729           BlitBitmapMasked(src_bitmap, drawto, src_x, src_y, width, height,
2730                            dst_x, dst_y);
2731         else
2732           BlitBitmap(src_bitmap, drawto, src_x, src_y, width, height,
2733                      dst_x, dst_y);
2734       }
2735     }
2736     else if (type == TYPE_GRAPHIC)
2737     {
2738       int graphic        = gpc->graphic;
2739       int graphic_active = gpc->graphic_active;
2740       Bitmap *src_bitmap;
2741       int src_x, src_y;
2742       int width, height;
2743       int dst_x = PANEL_XPOS(pos);
2744       int dst_y = PANEL_YPOS(pos);
2745       boolean skip = (pos->class == get_hash_from_key("mm_engine_only") &&
2746                       level.game_engine_type != GAME_ENGINE_TYPE_MM);
2747
2748       if (graphic != IMG_UNDEFINED && !skip)
2749       {
2750         if (pos->style == STYLE_REVERSE)
2751           value = 100 - value;
2752
2753         getGraphicSource(graphic_active, frame, &src_bitmap, &src_x, &src_y);
2754
2755         if (pos->direction & MV_HORIZONTAL)
2756         {
2757           width  = graphic_info[graphic_active].width * value / 100;
2758           height = graphic_info[graphic_active].height;
2759
2760           if (pos->direction == MV_LEFT)
2761           {
2762             src_x += graphic_info[graphic_active].width - width;
2763             dst_x += graphic_info[graphic_active].width - width;
2764           }
2765         }
2766         else
2767         {
2768           width  = graphic_info[graphic_active].width;
2769           height = graphic_info[graphic_active].height * value / 100;
2770
2771           if (pos->direction == MV_UP)
2772           {
2773             src_y += graphic_info[graphic_active].height - height;
2774             dst_y += graphic_info[graphic_active].height - height;
2775           }
2776         }
2777
2778         if (draw_masked)
2779           BlitBitmapMasked(src_bitmap, drawto, src_x, src_y, width, height,
2780                            dst_x, dst_y);
2781         else
2782           BlitBitmap(src_bitmap, drawto, src_x, src_y, width, height,
2783                      dst_x, dst_y);
2784
2785         getGraphicSource(graphic, frame, &src_bitmap, &src_x, &src_y);
2786
2787         if (pos->direction & MV_HORIZONTAL)
2788         {
2789           if (pos->direction == MV_RIGHT)
2790           {
2791             src_x += width;
2792             dst_x += width;
2793           }
2794           else
2795           {
2796             dst_x = PANEL_XPOS(pos);
2797           }
2798
2799           width = graphic_info[graphic].width - width;
2800         }
2801         else
2802         {
2803           if (pos->direction == MV_DOWN)
2804           {
2805             src_y += height;
2806             dst_y += height;
2807           }
2808           else
2809           {
2810             dst_y = PANEL_YPOS(pos);
2811           }
2812
2813           height = graphic_info[graphic].height - height;
2814         }
2815
2816         if (draw_masked)
2817           BlitBitmapMasked(src_bitmap, drawto, src_x, src_y, width, height,
2818                            dst_x, dst_y);
2819         else
2820           BlitBitmap(src_bitmap, drawto, src_x, src_y, width, height,
2821                      dst_x, dst_y);
2822       }
2823     }
2824     else if (type == TYPE_STRING)
2825     {
2826       boolean active = (value != 0);
2827       char *state_normal = "off";
2828       char *state_active = "on";
2829       char *state = (active ? state_active : state_normal);
2830       char *s = (nr == GAME_PANEL_GRAVITY_STATE ? state :
2831                  nr == GAME_PANEL_PLAYER_NAME   ? setup.player_name :
2832                  nr == GAME_PANEL_LEVEL_NAME    ? level.name :
2833                  nr == GAME_PANEL_LEVEL_AUTHOR  ? level.author : NULL);
2834
2835       if (nr == GAME_PANEL_GRAVITY_STATE)
2836       {
2837         int font1 = pos->font;          // (used for normal state)
2838         int font2 = pos->font_alt;      // (used for active state)
2839
2840         font = (active ? font2 : font1);
2841       }
2842
2843       if (s != NULL)
2844       {
2845         char *s_cut;
2846
2847         if (size <= 0)
2848         {
2849           // don't truncate output if "chars" is zero or less
2850           size = strlen(s);
2851
2852           // dynamically correct text alignment
2853           pos->width = size * getFontWidth(font);
2854         }
2855
2856         s_cut = getStringCopyN(s, size);
2857
2858         DrawTextExt(drawto, PANEL_XPOS(pos), PANEL_YPOS(pos),
2859                     s_cut, font, mask_mode);
2860
2861         free(s_cut);
2862       }
2863     }
2864
2865     redraw_mask |= REDRAW_DOOR_1;
2866   }
2867
2868   SetGameStatus(GAME_MODE_PLAYING);
2869 }
2870
2871 void UpdateAndDisplayGameControlValues(void)
2872 {
2873   if (tape.deactivate_display)
2874     return;
2875
2876   UpdateGameControlValues();
2877   DisplayGameControlValues();
2878 }
2879
2880 void UpdateGameDoorValues(void)
2881 {
2882   UpdateGameControlValues();
2883 }
2884
2885 void DrawGameDoorValues(void)
2886 {
2887   DisplayGameControlValues();
2888 }
2889
2890
2891 // ============================================================================
2892 // InitGameEngine()
2893 // ----------------------------------------------------------------------------
2894 // initialize game engine due to level / tape version number
2895 // ============================================================================
2896
2897 static void InitGameEngine(void)
2898 {
2899   int i, j, k, l, x, y;
2900
2901   // set game engine from tape file when re-playing, else from level file
2902   game.engine_version = (tape.playing ? tape.engine_version :
2903                          level.game_version);
2904
2905   // set single or multi-player game mode (needed for re-playing tapes)
2906   game.team_mode = setup.team_mode;
2907
2908   if (tape.playing)
2909   {
2910     int num_players = 0;
2911
2912     for (i = 0; i < MAX_PLAYERS; i++)
2913       if (tape.player_participates[i])
2914         num_players++;
2915
2916     // multi-player tapes contain input data for more than one player
2917     game.team_mode = (num_players > 1);
2918   }
2919
2920 #if 0
2921   Debug("game:init:level", "level %d: level.game_version  == %06d", level_nr,
2922         level.game_version);
2923   Debug("game:init:level", "          tape.file_version   == %06d",
2924         tape.file_version);
2925   Debug("game:init:level", "          tape.game_version   == %06d",
2926         tape.game_version);
2927   Debug("game:init:level", "          tape.engine_version == %06d",
2928         tape.engine_version);
2929   Debug("game:init:level", "       => game.engine_version == %06d [tape mode: %s]",
2930         game.engine_version, (tape.playing ? "PLAYING" : "RECORDING"));
2931 #endif
2932
2933   // --------------------------------------------------------------------------
2934   // set flags for bugs and changes according to active game engine version
2935   // --------------------------------------------------------------------------
2936
2937   /*
2938     Summary of bugfix:
2939     Fixed property "can fall" for run-time element "EL_AMOEBA_DROPPING"
2940
2941     Bug was introduced in version:
2942     2.0.1
2943
2944     Bug was fixed in version:
2945     4.2.0.0
2946
2947     Description:
2948     In version 2.0.1, a new run-time element "EL_AMOEBA_DROPPING" was added,
2949     but the property "can fall" was missing, which caused some levels to be
2950     unsolvable. This was fixed in version 4.2.0.0.
2951
2952     Affected levels/tapes:
2953     An example for a tape that was fixed by this bugfix is tape 029 from the
2954     level set "rnd_sam_bateman".
2955     The wrong behaviour will still be used for all levels or tapes that were
2956     created/recorded with it. An example for this is tape 023 from the level
2957     set "rnd_gerhard_haeusler", which was recorded with a buggy game engine.
2958   */
2959
2960   boolean use_amoeba_dropping_cannot_fall_bug =
2961     ((game.engine_version >= VERSION_IDENT(2,0,1,0) &&
2962       game.engine_version <  VERSION_IDENT(4,2,0,0)) ||
2963      (tape.playing &&
2964       tape.game_version >= VERSION_IDENT(2,0,1,0) &&
2965       tape.game_version <  VERSION_IDENT(4,2,0,0)));
2966
2967   /*
2968     Summary of bugfix/change:
2969     Fixed move speed of elements entering or leaving magic wall.
2970
2971     Fixed/changed in version:
2972     2.0.1
2973
2974     Description:
2975     Before 2.0.1, move speed of elements entering or leaving magic wall was
2976     twice as fast as it is now.
2977     Since 2.0.1, this is set to a lower value by using move_stepsize_list[].
2978
2979     Affected levels/tapes:
2980     The first condition is generally needed for all levels/tapes before version
2981     2.0.1, which might use the old behaviour before it was changed; known tapes
2982     that are affected: Tape 014 from the level set "rnd_conor_mancone".
2983     The second condition is an exception from the above case and is needed for
2984     the special case of tapes recorded with game (not engine!) version 2.0.1 or
2985     above, but before it was known that this change would break tapes like the
2986     above and was fixed in 4.2.0.0, so that the changed behaviour was active
2987     although the engine version while recording maybe was before 2.0.1. There
2988     are a lot of tapes that are affected by this exception, like tape 006 from
2989     the level set "rnd_conor_mancone".
2990   */
2991
2992   boolean use_old_move_stepsize_for_magic_wall =
2993     (game.engine_version < VERSION_IDENT(2,0,1,0) &&
2994      !(tape.playing &&
2995        tape.game_version >= VERSION_IDENT(2,0,1,0) &&
2996        tape.game_version <  VERSION_IDENT(4,2,0,0)));
2997
2998   /*
2999     Summary of bugfix/change:
3000     Fixed handling for custom elements that change when pushed by the player.
3001
3002     Fixed/changed in version:
3003     3.1.0
3004
3005     Description:
3006     Before 3.1.0, custom elements that "change when pushing" changed directly
3007     after the player started pushing them (until then handled in "DigField()").
3008     Since 3.1.0, these custom elements are not changed until the "pushing"
3009     move of the element is finished (now handled in "ContinueMoving()").
3010
3011     Affected levels/tapes:
3012     The first condition is generally needed for all levels/tapes before version
3013     3.1.0, which might use the old behaviour before it was changed; known tapes
3014     that are affected are some tapes from the level set "Walpurgis Gardens" by
3015     Jamie Cullen.
3016     The second condition is an exception from the above case and is needed for
3017     the special case of tapes recorded with game (not engine!) version 3.1.0 or
3018     above (including some development versions of 3.1.0), but before it was
3019     known that this change would break tapes like the above and was fixed in
3020     3.1.1, so that the changed behaviour was active although the engine version
3021     while recording maybe was before 3.1.0. There is at least one tape that is
3022     affected by this exception, which is the tape for the one-level set "Bug
3023     Machine" by Juergen Bonhagen.
3024   */
3025
3026   game.use_change_when_pushing_bug =
3027     (game.engine_version < VERSION_IDENT(3,1,0,0) &&
3028      !(tape.playing &&
3029        tape.game_version >= VERSION_IDENT(3,1,0,0) &&
3030        tape.game_version <  VERSION_IDENT(3,1,1,0)));
3031
3032   /*
3033     Summary of bugfix/change:
3034     Fixed handling for blocking the field the player leaves when moving.
3035
3036     Fixed/changed in version:
3037     3.1.1
3038
3039     Description:
3040     Before 3.1.1, when "block last field when moving" was enabled, the field
3041     the player is leaving when moving was blocked for the time of the move,
3042     and was directly unblocked afterwards. This resulted in the last field
3043     being blocked for exactly one less than the number of frames of one player
3044     move. Additionally, even when blocking was disabled, the last field was
3045     blocked for exactly one frame.
3046     Since 3.1.1, due to changes in player movement handling, the last field
3047     is not blocked at all when blocking is disabled. When blocking is enabled,
3048     the last field is blocked for exactly the number of frames of one player
3049     move. Additionally, if the player is Murphy, the hero of Supaplex, the
3050     last field is blocked for exactly one more than the number of frames of
3051     one player move.
3052
3053     Affected levels/tapes:
3054     (!!! yet to be determined -- probably many !!!)
3055   */
3056
3057   game.use_block_last_field_bug =
3058     (game.engine_version < VERSION_IDENT(3,1,1,0));
3059
3060   /* various special flags and settings for native Emerald Mine game engine */
3061
3062   game_em.use_single_button =
3063     (game.engine_version > VERSION_IDENT(4,0,0,2));
3064
3065   game_em.use_snap_key_bug =
3066     (game.engine_version < VERSION_IDENT(4,0,1,0));
3067
3068   game_em.use_random_bug =
3069     (tape.property_bits & TAPE_PROPERTY_EM_RANDOM_BUG);
3070
3071   boolean use_old_em_engine = (game.engine_version < VERSION_IDENT(4,2,0,0));
3072
3073   game_em.use_old_explosions            = use_old_em_engine;
3074   game_em.use_old_android               = use_old_em_engine;
3075   game_em.use_old_push_elements         = use_old_em_engine;
3076   game_em.use_old_push_into_acid        = use_old_em_engine;
3077
3078   game_em.use_wrap_around               = !use_old_em_engine;
3079
3080   // --------------------------------------------------------------------------
3081
3082   // set maximal allowed number of custom element changes per game frame
3083   game.max_num_changes_per_frame = 1;
3084
3085   // default scan direction: scan playfield from top/left to bottom/right
3086   InitPlayfieldScanMode(CA_ARG_SCAN_MODE_NORMAL);
3087
3088   // dynamically adjust element properties according to game engine version
3089   InitElementPropertiesEngine(game.engine_version);
3090
3091   // ---------- initialize special element properties -------------------------
3092
3093   // "EL_AMOEBA_DROPPING" missed property "can fall" in older game versions
3094   if (use_amoeba_dropping_cannot_fall_bug)
3095     SET_PROPERTY(EL_AMOEBA_DROPPING, EP_CAN_FALL, FALSE);
3096
3097   // ---------- initialize player's initial move delay ------------------------
3098
3099   // dynamically adjust player properties according to level information
3100   for (i = 0; i < MAX_PLAYERS; i++)
3101     game.initial_move_delay_value[i] =
3102       get_move_delay_from_stepsize(level.initial_player_stepsize[i]);
3103
3104   // dynamically adjust player properties according to game engine version
3105   for (i = 0; i < MAX_PLAYERS; i++)
3106     game.initial_move_delay[i] =
3107       (game.engine_version <= VERSION_IDENT(2,0,1,0) ?
3108        game.initial_move_delay_value[i] : 0);
3109
3110   // ---------- initialize player's initial push delay ------------------------
3111
3112   // dynamically adjust player properties according to game engine version
3113   game.initial_push_delay_value =
3114     (game.engine_version < VERSION_IDENT(3,0,7,1) ? 5 : -1);
3115
3116   // ---------- initialize changing elements ----------------------------------
3117
3118   // initialize changing elements information
3119   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3120   {
3121     struct ElementInfo *ei = &element_info[i];
3122
3123     // this pointer might have been changed in the level editor
3124     ei->change = &ei->change_page[0];
3125
3126     if (!IS_CUSTOM_ELEMENT(i))
3127     {
3128       ei->change->target_element = EL_EMPTY_SPACE;
3129       ei->change->delay_fixed = 0;
3130       ei->change->delay_random = 0;
3131       ei->change->delay_frames = 1;
3132     }
3133
3134     for (j = 0; j < NUM_CHANGE_EVENTS; j++)
3135     {
3136       ei->has_change_event[j] = FALSE;
3137
3138       ei->event_page_nr[j] = 0;
3139       ei->event_page[j] = &ei->change_page[0];
3140     }
3141   }
3142
3143   // add changing elements from pre-defined list
3144   for (i = 0; change_delay_list[i].element != EL_UNDEFINED; i++)
3145   {
3146     struct ChangingElementInfo *ch_delay = &change_delay_list[i];
3147     struct ElementInfo *ei = &element_info[ch_delay->element];
3148
3149     ei->change->target_element       = ch_delay->target_element;
3150     ei->change->delay_fixed          = ch_delay->change_delay;
3151
3152     ei->change->pre_change_function  = ch_delay->pre_change_function;
3153     ei->change->change_function      = ch_delay->change_function;
3154     ei->change->post_change_function = ch_delay->post_change_function;
3155
3156     ei->change->can_change = TRUE;
3157     ei->change->can_change_or_has_action = TRUE;
3158
3159     ei->has_change_event[CE_DELAY] = TRUE;
3160
3161     SET_PROPERTY(ch_delay->element, EP_CAN_CHANGE, TRUE);
3162     SET_PROPERTY(ch_delay->element, EP_CAN_CHANGE_OR_HAS_ACTION, TRUE);
3163   }
3164
3165   // ---------- initialize internal run-time variables ------------------------
3166
3167   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
3168   {
3169     struct ElementInfo *ei = &element_info[EL_CUSTOM_START + i];
3170
3171     for (j = 0; j < ei->num_change_pages; j++)
3172     {
3173       ei->change_page[j].can_change_or_has_action =
3174         (ei->change_page[j].can_change |
3175          ei->change_page[j].has_action);
3176     }
3177   }
3178
3179   // add change events from custom element configuration
3180   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
3181   {
3182     struct ElementInfo *ei = &element_info[EL_CUSTOM_START + i];
3183
3184     for (j = 0; j < ei->num_change_pages; j++)
3185     {
3186       if (!ei->change_page[j].can_change_or_has_action)
3187         continue;
3188
3189       for (k = 0; k < NUM_CHANGE_EVENTS; k++)
3190       {
3191         // only add event page for the first page found with this event
3192         if (ei->change_page[j].has_event[k] && !(ei->has_change_event[k]))
3193         {
3194           ei->has_change_event[k] = TRUE;
3195
3196           ei->event_page_nr[k] = j;
3197           ei->event_page[k] = &ei->change_page[j];
3198         }
3199       }
3200     }
3201   }
3202
3203   // ---------- initialize reference elements in change conditions ------------
3204
3205   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
3206   {
3207     int element = EL_CUSTOM_START + i;
3208     struct ElementInfo *ei = &element_info[element];
3209
3210     for (j = 0; j < ei->num_change_pages; j++)
3211     {
3212       int trigger_element = ei->change_page[j].initial_trigger_element;
3213
3214       if (trigger_element >= EL_PREV_CE_8 &&
3215           trigger_element <= EL_NEXT_CE_8)
3216         trigger_element = RESOLVED_REFERENCE_ELEMENT(element, trigger_element);
3217
3218       ei->change_page[j].trigger_element = trigger_element;
3219     }
3220   }
3221
3222   // ---------- initialize run-time trigger player and element ----------------
3223
3224   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
3225   {
3226     struct ElementInfo *ei = &element_info[EL_CUSTOM_START + i];
3227
3228     for (j = 0; j < ei->num_change_pages; j++)
3229     {
3230       ei->change_page[j].actual_trigger_element = EL_EMPTY;
3231       ei->change_page[j].actual_trigger_player = EL_EMPTY;
3232       ei->change_page[j].actual_trigger_player_bits = CH_PLAYER_NONE;
3233       ei->change_page[j].actual_trigger_side = CH_SIDE_NONE;
3234       ei->change_page[j].actual_trigger_ce_value = 0;
3235       ei->change_page[j].actual_trigger_ce_score = 0;
3236     }
3237   }
3238
3239   // ---------- initialize trigger events -------------------------------------
3240
3241   // initialize trigger events information
3242   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3243     for (j = 0; j < NUM_CHANGE_EVENTS; j++)
3244       trigger_events[i][j] = FALSE;
3245
3246   // add trigger events from element change event properties
3247   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3248   {
3249     struct ElementInfo *ei = &element_info[i];
3250
3251     for (j = 0; j < ei->num_change_pages; j++)
3252     {
3253       if (!ei->change_page[j].can_change_or_has_action)
3254         continue;
3255
3256       if (ei->change_page[j].has_event[CE_BY_OTHER_ACTION])
3257       {
3258         int trigger_element = ei->change_page[j].trigger_element;
3259
3260         for (k = 0; k < NUM_CHANGE_EVENTS; k++)
3261         {
3262           if (ei->change_page[j].has_event[k])
3263           {
3264             if (IS_GROUP_ELEMENT(trigger_element))
3265             {
3266               struct ElementGroupInfo *group =
3267                 element_info[trigger_element].group;
3268
3269               for (l = 0; l < group->num_elements_resolved; l++)
3270                 trigger_events[group->element_resolved[l]][k] = TRUE;
3271             }
3272             else if (trigger_element == EL_ANY_ELEMENT)
3273               for (l = 0; l < MAX_NUM_ELEMENTS; l++)
3274                 trigger_events[l][k] = TRUE;
3275             else
3276               trigger_events[trigger_element][k] = TRUE;
3277           }
3278         }
3279       }
3280     }
3281   }
3282
3283   // ---------- initialize push delay -----------------------------------------
3284
3285   // initialize push delay values to default
3286   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3287   {
3288     if (!IS_CUSTOM_ELEMENT(i))
3289     {
3290       // set default push delay values (corrected since version 3.0.7-1)
3291       if (game.engine_version < VERSION_IDENT(3,0,7,1))
3292       {
3293         element_info[i].push_delay_fixed = 2;
3294         element_info[i].push_delay_random = 8;
3295       }
3296       else
3297       {
3298         element_info[i].push_delay_fixed = 8;
3299         element_info[i].push_delay_random = 8;
3300       }
3301     }
3302   }
3303
3304   // set push delay value for certain elements from pre-defined list
3305   for (i = 0; push_delay_list[i].element != EL_UNDEFINED; i++)
3306   {
3307     int e = push_delay_list[i].element;
3308
3309     element_info[e].push_delay_fixed  = push_delay_list[i].push_delay_fixed;
3310     element_info[e].push_delay_random = push_delay_list[i].push_delay_random;
3311   }
3312
3313   // set push delay value for Supaplex elements for newer engine versions
3314   if (game.engine_version >= VERSION_IDENT(3,1,0,0))
3315   {
3316     for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3317     {
3318       if (IS_SP_ELEMENT(i))
3319       {
3320         // set SP push delay to just enough to push under a falling zonk
3321         int delay = (game.engine_version >= VERSION_IDENT(3,1,1,0) ? 8 : 6);
3322
3323         element_info[i].push_delay_fixed  = delay;
3324         element_info[i].push_delay_random = 0;
3325       }
3326     }
3327   }
3328
3329   // ---------- initialize move stepsize --------------------------------------
3330
3331   // initialize move stepsize values to default
3332   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3333     if (!IS_CUSTOM_ELEMENT(i))
3334       element_info[i].move_stepsize = MOVE_STEPSIZE_NORMAL;
3335
3336   // set move stepsize value for certain elements from pre-defined list
3337   for (i = 0; move_stepsize_list[i].element != EL_UNDEFINED; i++)
3338   {
3339     int e = move_stepsize_list[i].element;
3340
3341     element_info[e].move_stepsize = move_stepsize_list[i].move_stepsize;
3342
3343     // set move stepsize value for certain elements for older engine versions
3344     if (use_old_move_stepsize_for_magic_wall)
3345     {
3346       if (e == EL_MAGIC_WALL_FILLING ||
3347           e == EL_MAGIC_WALL_EMPTYING ||
3348           e == EL_BD_MAGIC_WALL_FILLING ||
3349           e == EL_BD_MAGIC_WALL_EMPTYING)
3350         element_info[e].move_stepsize *= 2;
3351     }
3352   }
3353
3354   // ---------- initialize collect score --------------------------------------
3355
3356   // initialize collect score values for custom elements from initial value
3357   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3358     if (IS_CUSTOM_ELEMENT(i))
3359       element_info[i].collect_score = element_info[i].collect_score_initial;
3360
3361   // ---------- initialize collect count --------------------------------------
3362
3363   // initialize collect count values for non-custom elements
3364   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3365     if (!IS_CUSTOM_ELEMENT(i))
3366       element_info[i].collect_count_initial = 0;
3367
3368   // add collect count values for all elements from pre-defined list
3369   for (i = 0; collect_count_list[i].element != EL_UNDEFINED; i++)
3370     element_info[collect_count_list[i].element].collect_count_initial =
3371       collect_count_list[i].count;
3372
3373   // ---------- initialize access direction -----------------------------------
3374
3375   // initialize access direction values to default (access from every side)
3376   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3377     if (!IS_CUSTOM_ELEMENT(i))
3378       element_info[i].access_direction = MV_ALL_DIRECTIONS;
3379
3380   // set access direction value for certain elements from pre-defined list
3381   for (i = 0; access_direction_list[i].element != EL_UNDEFINED; i++)
3382     element_info[access_direction_list[i].element].access_direction =
3383       access_direction_list[i].direction;
3384
3385   // ---------- initialize explosion content ----------------------------------
3386   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3387   {
3388     if (IS_CUSTOM_ELEMENT(i))
3389       continue;
3390
3391     for (y = 0; y < 3; y++) for (x = 0; x < 3; x++)
3392     {
3393       // (content for EL_YAMYAM set at run-time with game.yamyam_content_nr)
3394
3395       element_info[i].content.e[x][y] =
3396         (i == EL_PLAYER_1 ? EL_EMERALD_YELLOW :
3397          i == EL_PLAYER_2 ? EL_EMERALD_RED :
3398          i == EL_PLAYER_3 ? EL_EMERALD :
3399          i == EL_PLAYER_4 ? EL_EMERALD_PURPLE :
3400          i == EL_MOLE ? EL_EMERALD_RED :
3401          i == EL_PENGUIN ? EL_EMERALD_PURPLE :
3402          i == EL_BUG ? (x == 1 && y == 1 ? EL_DIAMOND : EL_EMERALD) :
3403          i == EL_BD_BUTTERFLY ? EL_BD_DIAMOND :
3404          i == EL_SP_ELECTRON ? EL_SP_INFOTRON :
3405          i == EL_AMOEBA_TO_DIAMOND ? level.amoeba_content :
3406          i == EL_WALL_EMERALD ? EL_EMERALD :
3407          i == EL_WALL_DIAMOND ? EL_DIAMOND :
3408          i == EL_WALL_BD_DIAMOND ? EL_BD_DIAMOND :
3409          i == EL_WALL_EMERALD_YELLOW ? EL_EMERALD_YELLOW :
3410          i == EL_WALL_EMERALD_RED ? EL_EMERALD_RED :
3411          i == EL_WALL_EMERALD_PURPLE ? EL_EMERALD_PURPLE :
3412          i == EL_WALL_PEARL ? EL_PEARL :
3413          i == EL_WALL_CRYSTAL ? EL_CRYSTAL :
3414          EL_EMPTY);
3415     }
3416   }
3417
3418   // ---------- initialize recursion detection --------------------------------
3419   recursion_loop_depth = 0;
3420   recursion_loop_detected = FALSE;
3421   recursion_loop_element = EL_UNDEFINED;
3422
3423   // ---------- initialize graphics engine ------------------------------------
3424   game.scroll_delay_value =
3425     (game.forced_scroll_delay_value != -1 ? game.forced_scroll_delay_value :
3426      level.game_engine_type == GAME_ENGINE_TYPE_EM &&
3427      !setup.forced_scroll_delay           ? 0 :
3428      setup.scroll_delay                   ? setup.scroll_delay_value       : 0);
3429   game.scroll_delay_value =
3430     MIN(MAX(MIN_SCROLL_DELAY, game.scroll_delay_value), MAX_SCROLL_DELAY);
3431
3432   // ---------- initialize game engine snapshots ------------------------------
3433   for (i = 0; i < MAX_PLAYERS; i++)
3434     game.snapshot.last_action[i] = 0;
3435   game.snapshot.changed_action = FALSE;
3436   game.snapshot.collected_item = FALSE;
3437   game.snapshot.mode =
3438     (strEqual(setup.engine_snapshot_mode, STR_SNAPSHOT_MODE_EVERY_STEP) ?
3439      SNAPSHOT_MODE_EVERY_STEP :
3440      strEqual(setup.engine_snapshot_mode, STR_SNAPSHOT_MODE_EVERY_MOVE) ?
3441      SNAPSHOT_MODE_EVERY_MOVE :
3442      strEqual(setup.engine_snapshot_mode, STR_SNAPSHOT_MODE_EVERY_COLLECT) ?
3443      SNAPSHOT_MODE_EVERY_COLLECT : SNAPSHOT_MODE_OFF);
3444   game.snapshot.save_snapshot = FALSE;
3445
3446   // ---------- initialize level time for Supaplex engine ---------------------
3447   // Supaplex levels with time limit currently unsupported -- should be added
3448   if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
3449     level.time = 0;
3450
3451   // ---------- initialize flags for handling game actions --------------------
3452
3453   // set flags for game actions to default values
3454   game.use_key_actions = TRUE;
3455   game.use_mouse_actions = FALSE;
3456
3457   // when using Mirror Magic game engine, handle mouse events only
3458   if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
3459   {
3460     game.use_key_actions = FALSE;
3461     game.use_mouse_actions = TRUE;
3462   }
3463
3464   // check for custom elements with mouse click events
3465   if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
3466   {
3467     for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
3468     {
3469       int element = EL_CUSTOM_START + i;
3470
3471       if (HAS_CHANGE_EVENT(element, CE_CLICKED_BY_MOUSE) ||
3472           HAS_CHANGE_EVENT(element, CE_PRESSED_BY_MOUSE) ||
3473           HAS_CHANGE_EVENT(element, CE_MOUSE_CLICKED_ON_X) ||
3474           HAS_CHANGE_EVENT(element, CE_MOUSE_PRESSED_ON_X))
3475         game.use_mouse_actions = TRUE;
3476     }
3477   }
3478 }
3479
3480 static int get_num_special_action(int element, int action_first,
3481                                   int action_last)
3482 {
3483   int num_special_action = 0;
3484   int i, j;
3485
3486   for (i = action_first; i <= action_last; i++)
3487   {
3488     boolean found = FALSE;
3489
3490     for (j = 0; j < NUM_DIRECTIONS; j++)
3491       if (el_act_dir2img(element, i, j) !=
3492           el_act_dir2img(element, ACTION_DEFAULT, j))
3493         found = TRUE;
3494
3495     if (found)
3496       num_special_action++;
3497     else
3498       break;
3499   }
3500
3501   return num_special_action;
3502 }
3503
3504
3505 // ============================================================================
3506 // InitGame()
3507 // ----------------------------------------------------------------------------
3508 // initialize and start new game
3509 // ============================================================================
3510
3511 #if DEBUG_INIT_PLAYER
3512 static void DebugPrintPlayerStatus(char *message)
3513 {
3514   int i;
3515
3516   if (!options.debug)
3517     return;
3518
3519   Debug("game:init:player", "%s:", message);
3520
3521   for (i = 0; i < MAX_PLAYERS; i++)
3522   {
3523     struct PlayerInfo *player = &stored_player[i];
3524
3525     Debug("game:init:player",
3526           "- player %d: present == %d, connected == %d [%d/%d], active == %d%s",
3527           i + 1,
3528           player->present,
3529           player->connected,
3530           player->connected_locally,
3531           player->connected_network,
3532           player->active,
3533           (local_player == player ? " (local player)" : ""));
3534   }
3535 }
3536 #endif
3537
3538 void InitGame(void)
3539 {
3540   int full_lev_fieldx = lev_fieldx + (BorderElement != EL_EMPTY ? 2 : 0);
3541   int full_lev_fieldy = lev_fieldy + (BorderElement != EL_EMPTY ? 2 : 0);
3542   int fade_mask = REDRAW_FIELD;
3543
3544   boolean emulate_bd = TRUE;    // unless non-BOULDERDASH elements found
3545   boolean emulate_sb = TRUE;    // unless non-SOKOBAN     elements found
3546   boolean emulate_sp = TRUE;    // unless non-SUPAPLEX    elements found
3547   int initial_move_dir = MV_DOWN;
3548   int i, j, x, y;
3549
3550   // required here to update video display before fading (FIX THIS)
3551   DrawMaskedBorder(REDRAW_DOOR_2);
3552
3553   if (!game.restart_level)
3554     CloseDoor(DOOR_CLOSE_1);
3555
3556   SetGameStatus(GAME_MODE_PLAYING);
3557
3558   if (level_editor_test_game)
3559     FadeSkipNextFadeOut();
3560   else
3561     FadeSetEnterScreen();
3562
3563   if (CheckFadeAll())
3564     fade_mask = REDRAW_ALL;
3565
3566   FadeLevelSoundsAndMusic();
3567
3568   ExpireSoundLoops(TRUE);
3569
3570   FadeOut(fade_mask);
3571
3572   if (level_editor_test_game)
3573     FadeSkipNextFadeIn();
3574
3575   // needed if different viewport properties defined for playing
3576   ChangeViewportPropertiesIfNeeded();
3577
3578   ClearField();
3579
3580   DrawCompleteVideoDisplay();
3581
3582   OpenDoor(GetDoorState() | DOOR_NO_DELAY | DOOR_FORCE_REDRAW);
3583
3584   InitGameEngine();
3585   InitGameControlValues();
3586
3587   if (tape.recording)
3588   {
3589     // initialize tape actions from game when recording tape
3590     tape.use_key_actions   = game.use_key_actions;
3591     tape.use_mouse_actions = game.use_mouse_actions;
3592
3593     // initialize visible playfield size when recording tape (for team mode)
3594     tape.scr_fieldx = SCR_FIELDX;
3595     tape.scr_fieldy = SCR_FIELDY;
3596   }
3597
3598   // don't play tapes over network
3599   network_playing = (network.enabled && !tape.playing);
3600
3601   for (i = 0; i < MAX_PLAYERS; i++)
3602   {
3603     struct PlayerInfo *player = &stored_player[i];
3604
3605     player->index_nr = i;
3606     player->index_bit = (1 << i);
3607     player->element_nr = EL_PLAYER_1 + i;
3608
3609     player->present = FALSE;
3610     player->active = FALSE;
3611     player->mapped = FALSE;
3612
3613     player->killed = FALSE;
3614     player->reanimated = FALSE;
3615     player->buried = FALSE;
3616
3617     player->action = 0;
3618     player->effective_action = 0;
3619     player->programmed_action = 0;
3620     player->snap_action = 0;
3621
3622     player->mouse_action.lx = 0;
3623     player->mouse_action.ly = 0;
3624     player->mouse_action.button = 0;
3625     player->mouse_action.button_hint = 0;
3626
3627     player->effective_mouse_action.lx = 0;
3628     player->effective_mouse_action.ly = 0;
3629     player->effective_mouse_action.button = 0;
3630     player->effective_mouse_action.button_hint = 0;
3631
3632     for (j = 0; j < MAX_NUM_KEYS; j++)
3633       player->key[j] = FALSE;
3634
3635     player->num_white_keys = 0;
3636
3637     player->dynabomb_count = 0;
3638     player->dynabomb_size = 1;
3639     player->dynabombs_left = 0;
3640     player->dynabomb_xl = FALSE;
3641
3642     player->MovDir = initial_move_dir;
3643     player->MovPos = 0;
3644     player->GfxPos = 0;
3645     player->GfxDir = initial_move_dir;
3646     player->GfxAction = ACTION_DEFAULT;
3647     player->Frame = 0;
3648     player->StepFrame = 0;
3649
3650     player->initial_element = player->element_nr;
3651     player->artwork_element =
3652       (level.use_artwork_element[i] ? level.artwork_element[i] :
3653        player->element_nr);
3654     player->use_murphy = FALSE;
3655
3656     player->block_last_field = FALSE;   // initialized in InitPlayerField()
3657     player->block_delay_adjustment = 0; // initialized in InitPlayerField()
3658
3659     player->gravity = level.initial_player_gravity[i];
3660
3661     player->can_fall_into_acid = CAN_MOVE_INTO_ACID(player->element_nr);
3662
3663     player->actual_frame_counter = 0;
3664
3665     player->step_counter = 0;
3666
3667     player->last_move_dir = initial_move_dir;
3668
3669     player->is_active = FALSE;
3670
3671     player->is_waiting = FALSE;
3672     player->is_moving = FALSE;
3673     player->is_auto_moving = FALSE;
3674     player->is_digging = FALSE;
3675     player->is_snapping = FALSE;
3676     player->is_collecting = FALSE;
3677     player->is_pushing = FALSE;
3678     player->is_switching = FALSE;
3679     player->is_dropping = FALSE;
3680     player->is_dropping_pressed = FALSE;
3681
3682     player->is_bored = FALSE;
3683     player->is_sleeping = FALSE;
3684
3685     player->was_waiting = TRUE;
3686     player->was_moving = FALSE;
3687     player->was_snapping = FALSE;
3688     player->was_dropping = FALSE;
3689
3690     player->force_dropping = FALSE;
3691
3692     player->frame_counter_bored = -1;
3693     player->frame_counter_sleeping = -1;
3694
3695     player->anim_delay_counter = 0;
3696     player->post_delay_counter = 0;
3697
3698     player->dir_waiting = initial_move_dir;
3699     player->action_waiting = ACTION_DEFAULT;
3700     player->last_action_waiting = ACTION_DEFAULT;
3701     player->special_action_bored = ACTION_DEFAULT;
3702     player->special_action_sleeping = ACTION_DEFAULT;
3703
3704     player->switch_x = -1;
3705     player->switch_y = -1;
3706
3707     player->drop_x = -1;
3708     player->drop_y = -1;
3709
3710     player->show_envelope = 0;
3711
3712     SetPlayerMoveSpeed(player, level.initial_player_stepsize[i], TRUE);
3713
3714     player->push_delay       = -1;      // initialized when pushing starts
3715     player->push_delay_value = game.initial_push_delay_value;
3716
3717     player->drop_delay = 0;
3718     player->drop_pressed_delay = 0;
3719
3720     player->last_jx = -1;
3721     player->last_jy = -1;
3722     player->jx = -1;
3723     player->jy = -1;
3724
3725     player->shield_normal_time_left = 0;
3726     player->shield_deadly_time_left = 0;
3727
3728     player->last_removed_element = EL_UNDEFINED;
3729
3730     player->inventory_infinite_element = EL_UNDEFINED;
3731     player->inventory_size = 0;
3732
3733     if (level.use_initial_inventory[i])
3734     {
3735       for (j = 0; j < level.initial_inventory_size[i]; j++)
3736       {
3737         int element = level.initial_inventory_content[i][j];
3738         int collect_count = element_info[element].collect_count_initial;
3739         int k;
3740
3741         if (!IS_CUSTOM_ELEMENT(element))
3742           collect_count = 1;
3743
3744         if (collect_count == 0)
3745           player->inventory_infinite_element = element;
3746         else
3747           for (k = 0; k < collect_count; k++)
3748             if (player->inventory_size < MAX_INVENTORY_SIZE)
3749               player->inventory_element[player->inventory_size++] = element;
3750       }
3751     }
3752
3753     DigField(player, 0, 0, 0, 0, 0, 0, DF_NO_PUSH);
3754     SnapField(player, 0, 0);
3755
3756     map_player_action[i] = i;
3757   }
3758
3759   network_player_action_received = FALSE;
3760
3761   // initial null action
3762   if (network_playing)
3763     SendToServer_MovePlayer(MV_NONE);
3764
3765   FrameCounter = 0;
3766   TimeFrames = 0;
3767   TimePlayed = 0;
3768   TimeLeft = level.time;
3769   TapeTime = 0;
3770
3771   ScreenMovDir = MV_NONE;
3772   ScreenMovPos = 0;
3773   ScreenGfxPos = 0;
3774
3775   ScrollStepSize = 0;   // will be correctly initialized by ScrollScreen()
3776
3777   game.robot_wheel_x = -1;
3778   game.robot_wheel_y = -1;
3779
3780   game.exit_x = -1;
3781   game.exit_y = -1;
3782
3783   game.all_players_gone = FALSE;
3784
3785   game.LevelSolved = FALSE;
3786   game.GameOver = FALSE;
3787
3788   game.GamePlayed = !tape.playing;
3789
3790   game.LevelSolved_GameWon = FALSE;
3791   game.LevelSolved_GameEnd = FALSE;
3792   game.LevelSolved_SaveTape = FALSE;
3793   game.LevelSolved_SaveScore = FALSE;
3794
3795   game.LevelSolved_CountingTime = 0;
3796   game.LevelSolved_CountingScore = 0;
3797   game.LevelSolved_CountingHealth = 0;
3798
3799   game.panel.active = TRUE;
3800
3801   game.no_time_limit = (level.time == 0);
3802
3803   game.yamyam_content_nr = 0;
3804   game.robot_wheel_active = FALSE;
3805   game.magic_wall_active = FALSE;
3806   game.magic_wall_time_left = 0;
3807   game.light_time_left = 0;
3808   game.timegate_time_left = 0;
3809   game.switchgate_pos = 0;
3810   game.wind_direction = level.wind_direction_initial;
3811
3812   game.time_final = 0;
3813   game.score_time_final = 0;
3814
3815   game.score = 0;
3816   game.score_final = 0;
3817
3818   game.health = MAX_HEALTH;
3819   game.health_final = MAX_HEALTH;
3820
3821   game.gems_still_needed = level.gems_needed;
3822   game.sokoban_fields_still_needed = 0;
3823   game.sokoban_objects_still_needed = 0;
3824   game.lights_still_needed = 0;
3825   game.players_still_needed = 0;
3826   game.friends_still_needed = 0;
3827
3828   game.lenses_time_left = 0;
3829   game.magnify_time_left = 0;
3830
3831   game.ball_active = level.ball_active_initial;
3832   game.ball_content_nr = 0;
3833
3834   game.explosions_delayed = TRUE;
3835
3836   game.envelope_active = FALSE;
3837
3838   for (i = 0; i < NUM_BELTS; i++)
3839   {
3840     game.belt_dir[i] = MV_NONE;
3841     game.belt_dir_nr[i] = 3;            // not moving, next moving left
3842   }
3843
3844   for (i = 0; i < MAX_NUM_AMOEBA; i++)
3845     AmoebaCnt[i] = AmoebaCnt2[i] = 0;
3846
3847 #if DEBUG_INIT_PLAYER
3848   DebugPrintPlayerStatus("Player status at level initialization");
3849 #endif
3850
3851   SCAN_PLAYFIELD(x, y)
3852   {
3853     Tile[x][y] = Last[x][y] = level.field[x][y];
3854     MovPos[x][y] = MovDir[x][y] = MovDelay[x][y] = 0;
3855     ChangeDelay[x][y] = 0;
3856     ChangePage[x][y] = -1;
3857     CustomValue[x][y] = 0;              // initialized in InitField()
3858     Store[x][y] = Store2[x][y] = StorePlayer[x][y] = Back[x][y] = 0;
3859     AmoebaNr[x][y] = 0;
3860     WasJustMoving[x][y] = 0;
3861     WasJustFalling[x][y] = 0;
3862     CheckCollision[x][y] = 0;
3863     CheckImpact[x][y] = 0;
3864     Stop[x][y] = FALSE;
3865     Pushed[x][y] = FALSE;
3866
3867     ChangeCount[x][y] = 0;
3868     ChangeEvent[x][y] = -1;
3869
3870     ExplodePhase[x][y] = 0;
3871     ExplodeDelay[x][y] = 0;
3872     ExplodeField[x][y] = EX_TYPE_NONE;
3873
3874     RunnerVisit[x][y] = 0;
3875     PlayerVisit[x][y] = 0;
3876
3877     GfxFrame[x][y] = 0;
3878     GfxRandom[x][y] = INIT_GFX_RANDOM();
3879     GfxElement[x][y] = EL_UNDEFINED;
3880     GfxAction[x][y] = ACTION_DEFAULT;
3881     GfxDir[x][y] = MV_NONE;
3882     GfxRedraw[x][y] = GFX_REDRAW_NONE;
3883   }
3884
3885   SCAN_PLAYFIELD(x, y)
3886   {
3887     if (emulate_bd && !IS_BD_ELEMENT(Tile[x][y]))
3888       emulate_bd = FALSE;
3889     if (emulate_sb && !IS_SB_ELEMENT(Tile[x][y]))
3890       emulate_sb = FALSE;
3891     if (emulate_sp && !IS_SP_ELEMENT(Tile[x][y]))
3892       emulate_sp = FALSE;
3893
3894     InitField(x, y, TRUE);
3895
3896     ResetGfxAnimation(x, y);
3897   }
3898
3899   InitBeltMovement();
3900
3901   for (i = 0; i < MAX_PLAYERS; i++)
3902   {
3903     struct PlayerInfo *player = &stored_player[i];
3904
3905     // set number of special actions for bored and sleeping animation
3906     player->num_special_action_bored =
3907       get_num_special_action(player->artwork_element,
3908                              ACTION_BORING_1, ACTION_BORING_LAST);
3909     player->num_special_action_sleeping =
3910       get_num_special_action(player->artwork_element,
3911                              ACTION_SLEEPING_1, ACTION_SLEEPING_LAST);
3912   }
3913
3914   game.emulation = (emulate_bd ? EMU_BOULDERDASH :
3915                     emulate_sb ? EMU_SOKOBAN :
3916                     emulate_sp ? EMU_SUPAPLEX : EMU_NONE);
3917
3918   // initialize type of slippery elements
3919   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3920   {
3921     if (!IS_CUSTOM_ELEMENT(i))
3922     {
3923       // default: elements slip down either to the left or right randomly
3924       element_info[i].slippery_type = SLIPPERY_ANY_RANDOM;
3925
3926       // SP style elements prefer to slip down on the left side
3927       if (game.engine_version >= VERSION_IDENT(3,1,1,0) && IS_SP_ELEMENT(i))
3928         element_info[i].slippery_type = SLIPPERY_ANY_LEFT_RIGHT;
3929
3930       // BD style elements prefer to slip down on the left side
3931       if (game.emulation == EMU_BOULDERDASH)
3932         element_info[i].slippery_type = SLIPPERY_ANY_LEFT_RIGHT;
3933     }
3934   }
3935
3936   // initialize explosion and ignition delay
3937   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3938   {
3939     if (!IS_CUSTOM_ELEMENT(i))
3940     {
3941       int num_phase = 8;
3942       int delay = (((IS_SP_ELEMENT(i) && i != EL_EMPTY_SPACE) &&
3943                     game.engine_version >= VERSION_IDENT(3,1,0,0)) ||
3944                    game.emulation == EMU_SUPAPLEX ? 3 : 2);
3945       int last_phase = (num_phase + 1) * delay;
3946       int half_phase = (num_phase / 2) * delay;
3947
3948       element_info[i].explosion_delay = last_phase - 1;
3949       element_info[i].ignition_delay = half_phase;
3950
3951       if (i == EL_BLACK_ORB)
3952         element_info[i].ignition_delay = 1;
3953     }
3954   }
3955
3956   // correct non-moving belts to start moving left
3957   for (i = 0; i < NUM_BELTS; i++)
3958     if (game.belt_dir[i] == MV_NONE)
3959       game.belt_dir_nr[i] = 3;          // not moving, next moving left
3960
3961 #if USE_NEW_PLAYER_ASSIGNMENTS
3962   // use preferred player also in local single-player mode
3963   if (!network.enabled && !game.team_mode)
3964   {
3965     int new_index_nr = setup.network_player_nr;
3966
3967     if (new_index_nr >= 0 && new_index_nr < MAX_PLAYERS)
3968     {
3969       for (i = 0; i < MAX_PLAYERS; i++)
3970         stored_player[i].connected_locally = FALSE;
3971
3972       stored_player[new_index_nr].connected_locally = TRUE;
3973     }
3974   }
3975
3976   for (i = 0; i < MAX_PLAYERS; i++)
3977   {
3978     stored_player[i].connected = FALSE;
3979
3980     // in network game mode, the local player might not be the first player
3981     if (stored_player[i].connected_locally)
3982       local_player = &stored_player[i];
3983   }
3984
3985   if (!network.enabled)
3986     local_player->connected = TRUE;
3987
3988   if (tape.playing)
3989   {
3990     for (i = 0; i < MAX_PLAYERS; i++)
3991       stored_player[i].connected = tape.player_participates[i];
3992   }
3993   else if (network.enabled)
3994   {
3995     // add team mode players connected over the network (needed for correct
3996     // assignment of player figures from level to locally playing players)
3997
3998     for (i = 0; i < MAX_PLAYERS; i++)
3999       if (stored_player[i].connected_network)
4000         stored_player[i].connected = TRUE;
4001   }
4002   else if (game.team_mode)
4003   {
4004     // try to guess locally connected team mode players (needed for correct
4005     // assignment of player figures from level to locally playing players)
4006
4007     for (i = 0; i < MAX_PLAYERS; i++)
4008       if (setup.input[i].use_joystick ||
4009           setup.input[i].key.left != KSYM_UNDEFINED)
4010         stored_player[i].connected = TRUE;
4011   }
4012
4013 #if DEBUG_INIT_PLAYER
4014   DebugPrintPlayerStatus("Player status after level initialization");
4015 #endif
4016
4017 #if DEBUG_INIT_PLAYER
4018   Debug("game:init:player", "Reassigning players ...");
4019 #endif
4020
4021   // check if any connected player was not found in playfield
4022   for (i = 0; i < MAX_PLAYERS; i++)
4023   {
4024     struct PlayerInfo *player = &stored_player[i];
4025
4026     if (player->connected && !player->present)
4027     {
4028       struct PlayerInfo *field_player = NULL;
4029
4030 #if DEBUG_INIT_PLAYER
4031       Debug("game:init:player",
4032             "- looking for field player for player %d ...", i + 1);
4033 #endif
4034
4035       // assign first free player found that is present in the playfield
4036
4037       // first try: look for unmapped playfield player that is not connected
4038       for (j = 0; j < MAX_PLAYERS; j++)
4039         if (field_player == NULL &&
4040             stored_player[j].present &&
4041             !stored_player[j].mapped &&
4042             !stored_player[j].connected)
4043           field_player = &stored_player[j];
4044
4045       // second try: look for *any* unmapped playfield player
4046       for (j = 0; j < MAX_PLAYERS; j++)
4047         if (field_player == NULL &&
4048             stored_player[j].present &&
4049             !stored_player[j].mapped)
4050           field_player = &stored_player[j];
4051
4052       if (field_player != NULL)
4053       {
4054         int jx = field_player->jx, jy = field_player->jy;
4055
4056 #if DEBUG_INIT_PLAYER
4057         Debug("game:init:player", "- found player %d",
4058               field_player->index_nr + 1);
4059 #endif
4060
4061         player->present = FALSE;
4062         player->active = FALSE;
4063
4064         field_player->present = TRUE;
4065         field_player->active = TRUE;
4066
4067         /*
4068         player->initial_element = field_player->initial_element;
4069         player->artwork_element = field_player->artwork_element;
4070
4071         player->block_last_field       = field_player->block_last_field;
4072         player->block_delay_adjustment = field_player->block_delay_adjustment;
4073         */
4074
4075         StorePlayer[jx][jy] = field_player->element_nr;
4076
4077         field_player->jx = field_player->last_jx = jx;
4078         field_player->jy = field_player->last_jy = jy;
4079
4080         if (local_player == player)
4081           local_player = field_player;
4082
4083         map_player_action[field_player->index_nr] = i;
4084
4085         field_player->mapped = TRUE;
4086
4087 #if DEBUG_INIT_PLAYER
4088         Debug("game:init:player", "- map_player_action[%d] == %d",
4089               field_player->index_nr + 1, i + 1);
4090 #endif
4091       }
4092     }
4093
4094     if (player->connected && player->present)
4095       player->mapped = TRUE;
4096   }
4097
4098 #if DEBUG_INIT_PLAYER
4099   DebugPrintPlayerStatus("Player status after player assignment (first stage)");
4100 #endif
4101
4102 #else
4103
4104   // check if any connected player was not found in playfield
4105   for (i = 0; i < MAX_PLAYERS; i++)
4106   {
4107     struct PlayerInfo *player = &stored_player[i];
4108
4109     if (player->connected && !player->present)
4110     {
4111       for (j = 0; j < MAX_PLAYERS; j++)
4112       {
4113         struct PlayerInfo *field_player = &stored_player[j];
4114         int jx = field_player->jx, jy = field_player->jy;
4115
4116         // assign first free player found that is present in the playfield
4117         if (field_player->present && !field_player->connected)
4118         {
4119           player->present = TRUE;
4120           player->active = TRUE;
4121
4122           field_player->present = FALSE;
4123           field_player->active = FALSE;
4124
4125           player->initial_element = field_player->initial_element;
4126           player->artwork_element = field_player->artwork_element;
4127
4128           player->block_last_field       = field_player->block_last_field;
4129           player->block_delay_adjustment = field_player->block_delay_adjustment;
4130
4131           StorePlayer[jx][jy] = player->element_nr;
4132
4133           player->jx = player->last_jx = jx;
4134           player->jy = player->last_jy = jy;
4135
4136           break;
4137         }
4138       }
4139     }
4140   }
4141 #endif
4142
4143 #if 0
4144   Debug("game:init:player", "local_player->present == %d",
4145         local_player->present);
4146 #endif
4147
4148   // set focus to local player for network games, else to all players
4149   game.centered_player_nr = (network_playing ? local_player->index_nr : -1);
4150   game.centered_player_nr_next = game.centered_player_nr;
4151   game.set_centered_player = FALSE;
4152   game.set_centered_player_wrap = FALSE;
4153
4154   if (network_playing && tape.recording)
4155   {
4156     // store client dependent player focus when recording network games
4157     tape.centered_player_nr_next = game.centered_player_nr_next;
4158     tape.set_centered_player = TRUE;
4159   }
4160
4161   if (tape.playing)
4162   {
4163     // when playing a tape, eliminate all players who do not participate
4164
4165 #if USE_NEW_PLAYER_ASSIGNMENTS
4166
4167     if (!game.team_mode)
4168     {
4169       for (i = 0; i < MAX_PLAYERS; i++)
4170       {
4171         if (stored_player[i].active &&
4172             !tape.player_participates[map_player_action[i]])
4173         {
4174           struct PlayerInfo *player = &stored_player[i];
4175           int jx = player->jx, jy = player->jy;
4176
4177 #if DEBUG_INIT_PLAYER
4178           Debug("game:init:player", "Removing player %d at (%d, %d)",
4179                 i + 1, jx, jy);
4180 #endif
4181
4182           player->active = FALSE;
4183           StorePlayer[jx][jy] = 0;
4184           Tile[jx][jy] = EL_EMPTY;
4185         }
4186       }
4187     }
4188
4189 #else
4190
4191     for (i = 0; i < MAX_PLAYERS; i++)
4192     {
4193       if (stored_player[i].active &&
4194           !tape.player_participates[i])
4195       {
4196         struct PlayerInfo *player = &stored_player[i];
4197         int jx = player->jx, jy = player->jy;
4198
4199         player->active = FALSE;
4200         StorePlayer[jx][jy] = 0;
4201         Tile[jx][jy] = EL_EMPTY;
4202       }
4203     }
4204 #endif
4205   }
4206   else if (!network.enabled && !game.team_mode)         // && !tape.playing
4207   {
4208     // when in single player mode, eliminate all but the local player
4209
4210     for (i = 0; i < MAX_PLAYERS; i++)
4211     {
4212       struct PlayerInfo *player = &stored_player[i];
4213
4214       if (player->active && player != local_player)
4215       {
4216         int jx = player->jx, jy = player->jy;
4217
4218         player->active = FALSE;
4219         player->present = FALSE;
4220
4221         StorePlayer[jx][jy] = 0;
4222         Tile[jx][jy] = EL_EMPTY;
4223       }
4224     }
4225   }
4226
4227   for (i = 0; i < MAX_PLAYERS; i++)
4228     if (stored_player[i].active)
4229       game.players_still_needed++;
4230
4231   if (level.solved_by_one_player)
4232     game.players_still_needed = 1;
4233
4234   // when recording the game, store which players take part in the game
4235   if (tape.recording)
4236   {
4237 #if USE_NEW_PLAYER_ASSIGNMENTS
4238     for (i = 0; i < MAX_PLAYERS; i++)
4239       if (stored_player[i].connected)
4240         tape.player_participates[i] = TRUE;
4241 #else
4242     for (i = 0; i < MAX_PLAYERS; i++)
4243       if (stored_player[i].active)
4244         tape.player_participates[i] = TRUE;
4245 #endif
4246   }
4247
4248 #if DEBUG_INIT_PLAYER
4249   DebugPrintPlayerStatus("Player status after player assignment (final stage)");
4250 #endif
4251
4252   if (BorderElement == EL_EMPTY)
4253   {
4254     SBX_Left = 0;
4255     SBX_Right = lev_fieldx - SCR_FIELDX;
4256     SBY_Upper = 0;
4257     SBY_Lower = lev_fieldy - SCR_FIELDY;
4258   }
4259   else
4260   {
4261     SBX_Left = -1;
4262     SBX_Right = lev_fieldx - SCR_FIELDX + 1;
4263     SBY_Upper = -1;
4264     SBY_Lower = lev_fieldy - SCR_FIELDY + 1;
4265   }
4266
4267   if (full_lev_fieldx <= SCR_FIELDX)
4268     SBX_Left = SBX_Right = -1 * (SCR_FIELDX - lev_fieldx) / 2;
4269   if (full_lev_fieldy <= SCR_FIELDY)
4270     SBY_Upper = SBY_Lower = -1 * (SCR_FIELDY - lev_fieldy) / 2;
4271
4272   if (EVEN(SCR_FIELDX) && full_lev_fieldx > SCR_FIELDX)
4273     SBX_Left--;
4274   if (EVEN(SCR_FIELDY) && full_lev_fieldy > SCR_FIELDY)
4275     SBY_Upper--;
4276
4277   // if local player not found, look for custom element that might create
4278   // the player (make some assumptions about the right custom element)
4279   if (!local_player->present)
4280   {
4281     int start_x = 0, start_y = 0;
4282     int found_rating = 0;
4283     int found_element = EL_UNDEFINED;
4284     int player_nr = local_player->index_nr;
4285
4286     SCAN_PLAYFIELD(x, y)
4287     {
4288       int element = Tile[x][y];
4289       int content;
4290       int xx, yy;
4291       boolean is_player;
4292
4293       if (level.use_start_element[player_nr] &&
4294           level.start_element[player_nr] == element &&
4295           found_rating < 4)
4296       {
4297         start_x = x;
4298         start_y = y;
4299
4300         found_rating = 4;
4301         found_element = element;
4302       }
4303
4304       if (!IS_CUSTOM_ELEMENT(element))
4305         continue;
4306
4307       if (CAN_CHANGE(element))
4308       {
4309         for (i = 0; i < element_info[element].num_change_pages; i++)
4310         {
4311           // check for player created from custom element as single target
4312           content = element_info[element].change_page[i].target_element;
4313           is_player = ELEM_IS_PLAYER(content);
4314
4315           if (is_player && (found_rating < 3 ||
4316                             (found_rating == 3 && element < found_element)))
4317           {
4318             start_x = x;
4319             start_y = y;
4320
4321             found_rating = 3;
4322             found_element = element;
4323           }
4324         }
4325       }
4326
4327       for (yy = 0; yy < 3; yy++) for (xx = 0; xx < 3; xx++)
4328       {
4329         // check for player created from custom element as explosion content
4330         content = element_info[element].content.e[xx][yy];
4331         is_player = ELEM_IS_PLAYER(content);
4332
4333         if (is_player && (found_rating < 2 ||
4334                           (found_rating == 2 && element < found_element)))
4335         {
4336           start_x = x + xx - 1;
4337           start_y = y + yy - 1;
4338
4339           found_rating = 2;
4340           found_element = element;
4341         }
4342
4343         if (!CAN_CHANGE(element))
4344           continue;
4345
4346         for (i = 0; i < element_info[element].num_change_pages; i++)
4347         {
4348           // check for player created from custom element as extended target
4349           content =
4350             element_info[element].change_page[i].target_content.e[xx][yy];
4351
4352           is_player = ELEM_IS_PLAYER(content);
4353
4354           if (is_player && (found_rating < 1 ||
4355                             (found_rating == 1 && element < found_element)))
4356           {
4357             start_x = x + xx - 1;
4358             start_y = y + yy - 1;
4359
4360             found_rating = 1;
4361             found_element = element;
4362           }
4363         }
4364       }
4365     }
4366
4367     scroll_x = SCROLL_POSITION_X(start_x);
4368     scroll_y = SCROLL_POSITION_Y(start_y);
4369   }
4370   else
4371   {
4372     scroll_x = SCROLL_POSITION_X(local_player->jx);
4373     scroll_y = SCROLL_POSITION_Y(local_player->jy);
4374   }
4375
4376   // !!! FIX THIS (START) !!!
4377   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
4378   {
4379     InitGameEngine_EM();
4380   }
4381   else if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
4382   {
4383     InitGameEngine_SP();
4384   }
4385   else if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
4386   {
4387     InitGameEngine_MM();
4388   }
4389   else
4390   {
4391     DrawLevel(REDRAW_FIELD);
4392     DrawAllPlayers();
4393
4394     // after drawing the level, correct some elements
4395     if (game.timegate_time_left == 0)
4396       CloseAllOpenTimegates();
4397   }
4398
4399   // blit playfield from scroll buffer to normal back buffer for fading in
4400   BlitScreenToBitmap(backbuffer);
4401   // !!! FIX THIS (END) !!!
4402
4403   DrawMaskedBorder(fade_mask);
4404
4405   FadeIn(fade_mask);
4406
4407 #if 1
4408   // full screen redraw is required at this point in the following cases:
4409   // - special editor door undrawn when game was started from level editor
4410   // - drawing area (playfield) was changed and has to be removed completely
4411   redraw_mask = REDRAW_ALL;
4412   BackToFront();
4413 #endif
4414
4415   if (!game.restart_level)
4416   {
4417     // copy default game door content to main double buffer
4418
4419     // !!! CHECK AGAIN !!!
4420     SetPanelBackground();
4421     // SetDoorBackgroundImage(IMG_BACKGROUND_PANEL);
4422     DrawBackground(DX, DY, DXSIZE, DYSIZE);
4423   }
4424
4425   SetPanelBackground();
4426   SetDrawBackgroundMask(REDRAW_DOOR_1);
4427
4428   UpdateAndDisplayGameControlValues();
4429
4430   if (!game.restart_level)
4431   {
4432     UnmapGameButtons();
4433     UnmapTapeButtons();
4434
4435     FreeGameButtons();
4436     CreateGameButtons();
4437
4438     MapGameButtons();
4439     MapTapeButtons();
4440
4441     // copy actual game door content to door double buffer for OpenDoor()
4442     BlitBitmap(drawto, bitmap_db_door_1, DX, DY, DXSIZE, DYSIZE, 0, 0);
4443
4444     OpenDoor(DOOR_OPEN_ALL);
4445
4446     KeyboardAutoRepeatOffUnlessAutoplay();
4447
4448 #if DEBUG_INIT_PLAYER
4449     DebugPrintPlayerStatus("Player status (final)");
4450 #endif
4451   }
4452
4453   UnmapAllGadgets();
4454
4455   MapGameButtons();
4456   MapTapeButtons();
4457
4458   if (!game.restart_level && !tape.playing)
4459   {
4460     LevelStats_incPlayed(level_nr);
4461
4462     SaveLevelSetup_SeriesInfo();
4463   }
4464
4465   game.restart_level = FALSE;
4466   game.restart_game_message = NULL;
4467
4468   game.request_active = FALSE;
4469   game.request_active_or_moving = FALSE;
4470
4471   if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
4472     InitGameActions_MM();
4473
4474   SaveEngineSnapshotToListInitial();
4475
4476   if (!game.restart_level)
4477   {
4478     PlaySound(SND_GAME_STARTING);
4479
4480     if (setup.sound_music)
4481       PlayLevelMusic();
4482   }
4483 }
4484
4485 void UpdateEngineValues(int actual_scroll_x, int actual_scroll_y,
4486                         int actual_player_x, int actual_player_y)
4487 {
4488   // this is used for non-R'n'D game engines to update certain engine values
4489
4490   // needed to determine if sounds are played within the visible screen area
4491   scroll_x = actual_scroll_x;
4492   scroll_y = actual_scroll_y;
4493
4494   // needed to get player position for "follow finger" playing input method
4495   local_player->jx = actual_player_x;
4496   local_player->jy = actual_player_y;
4497 }
4498
4499 void InitMovDir(int x, int y)
4500 {
4501   int i, element = Tile[x][y];
4502   static int xy[4][2] =
4503   {
4504     {  0, +1 },
4505     { +1,  0 },
4506     {  0, -1 },
4507     { -1,  0 }
4508   };
4509   static int direction[3][4] =
4510   {
4511     { MV_RIGHT, MV_UP,   MV_LEFT,  MV_DOWN },
4512     { MV_LEFT,  MV_DOWN, MV_RIGHT, MV_UP },
4513     { MV_LEFT,  MV_RIGHT, MV_UP, MV_DOWN }
4514   };
4515
4516   switch (element)
4517   {
4518     case EL_BUG_RIGHT:
4519     case EL_BUG_UP:
4520     case EL_BUG_LEFT:
4521     case EL_BUG_DOWN:
4522       Tile[x][y] = EL_BUG;
4523       MovDir[x][y] = direction[0][element - EL_BUG_RIGHT];
4524       break;
4525
4526     case EL_SPACESHIP_RIGHT:
4527     case EL_SPACESHIP_UP:
4528     case EL_SPACESHIP_LEFT:
4529     case EL_SPACESHIP_DOWN:
4530       Tile[x][y] = EL_SPACESHIP;
4531       MovDir[x][y] = direction[0][element - EL_SPACESHIP_RIGHT];
4532       break;
4533
4534     case EL_BD_BUTTERFLY_RIGHT:
4535     case EL_BD_BUTTERFLY_UP:
4536     case EL_BD_BUTTERFLY_LEFT:
4537     case EL_BD_BUTTERFLY_DOWN:
4538       Tile[x][y] = EL_BD_BUTTERFLY;
4539       MovDir[x][y] = direction[0][element - EL_BD_BUTTERFLY_RIGHT];
4540       break;
4541
4542     case EL_BD_FIREFLY_RIGHT:
4543     case EL_BD_FIREFLY_UP:
4544     case EL_BD_FIREFLY_LEFT:
4545     case EL_BD_FIREFLY_DOWN:
4546       Tile[x][y] = EL_BD_FIREFLY;
4547       MovDir[x][y] = direction[0][element - EL_BD_FIREFLY_RIGHT];
4548       break;
4549
4550     case EL_PACMAN_RIGHT:
4551     case EL_PACMAN_UP:
4552     case EL_PACMAN_LEFT:
4553     case EL_PACMAN_DOWN:
4554       Tile[x][y] = EL_PACMAN;
4555       MovDir[x][y] = direction[0][element - EL_PACMAN_RIGHT];
4556       break;
4557
4558     case EL_YAMYAM_LEFT:
4559     case EL_YAMYAM_RIGHT:
4560     case EL_YAMYAM_UP:
4561     case EL_YAMYAM_DOWN:
4562       Tile[x][y] = EL_YAMYAM;
4563       MovDir[x][y] = direction[2][element - EL_YAMYAM_LEFT];
4564       break;
4565
4566     case EL_SP_SNIKSNAK:
4567       MovDir[x][y] = MV_UP;
4568       break;
4569
4570     case EL_SP_ELECTRON:
4571       MovDir[x][y] = MV_LEFT;
4572       break;
4573
4574     case EL_MOLE_LEFT:
4575     case EL_MOLE_RIGHT:
4576     case EL_MOLE_UP:
4577     case EL_MOLE_DOWN:
4578       Tile[x][y] = EL_MOLE;
4579       MovDir[x][y] = direction[2][element - EL_MOLE_LEFT];
4580       break;
4581
4582     case EL_SPRING_LEFT:
4583     case EL_SPRING_RIGHT:
4584       Tile[x][y] = EL_SPRING;
4585       MovDir[x][y] = direction[2][element - EL_SPRING_LEFT];
4586       break;
4587
4588     default:
4589       if (IS_CUSTOM_ELEMENT(element))
4590       {
4591         struct ElementInfo *ei = &element_info[element];
4592         int move_direction_initial = ei->move_direction_initial;
4593         int move_pattern = ei->move_pattern;
4594
4595         if (move_direction_initial == MV_START_PREVIOUS)
4596         {
4597           if (MovDir[x][y] != MV_NONE)
4598             return;
4599
4600           move_direction_initial = MV_START_AUTOMATIC;
4601         }
4602
4603         if (move_direction_initial == MV_START_RANDOM)
4604           MovDir[x][y] = 1 << RND(4);
4605         else if (move_direction_initial & MV_ANY_DIRECTION)
4606           MovDir[x][y] = move_direction_initial;
4607         else if (move_pattern == MV_ALL_DIRECTIONS ||
4608                  move_pattern == MV_TURNING_LEFT ||
4609                  move_pattern == MV_TURNING_RIGHT ||
4610                  move_pattern == MV_TURNING_LEFT_RIGHT ||
4611                  move_pattern == MV_TURNING_RIGHT_LEFT ||
4612                  move_pattern == MV_TURNING_RANDOM)
4613           MovDir[x][y] = 1 << RND(4);
4614         else if (move_pattern == MV_HORIZONTAL)
4615           MovDir[x][y] = (RND(2) ? MV_LEFT : MV_RIGHT);
4616         else if (move_pattern == MV_VERTICAL)
4617           MovDir[x][y] = (RND(2) ? MV_UP : MV_DOWN);
4618         else if (move_pattern & MV_ANY_DIRECTION)
4619           MovDir[x][y] = element_info[element].move_pattern;
4620         else if (move_pattern == MV_ALONG_LEFT_SIDE ||
4621                  move_pattern == MV_ALONG_RIGHT_SIDE)
4622         {
4623           // use random direction as default start direction
4624           if (game.engine_version >= VERSION_IDENT(3,1,0,0))
4625             MovDir[x][y] = 1 << RND(4);
4626
4627           for (i = 0; i < NUM_DIRECTIONS; i++)
4628           {
4629             int x1 = x + xy[i][0];
4630             int y1 = y + xy[i][1];
4631
4632             if (!IN_LEV_FIELD(x1, y1) || !IS_FREE(x1, y1))
4633             {
4634               if (move_pattern == MV_ALONG_RIGHT_SIDE)
4635                 MovDir[x][y] = direction[0][i];
4636               else
4637                 MovDir[x][y] = direction[1][i];
4638
4639               break;
4640             }
4641           }
4642         }
4643       }
4644       else
4645       {
4646         MovDir[x][y] = 1 << RND(4);
4647
4648         if (element != EL_BUG &&
4649             element != EL_SPACESHIP &&
4650             element != EL_BD_BUTTERFLY &&
4651             element != EL_BD_FIREFLY)
4652           break;
4653
4654         for (i = 0; i < NUM_DIRECTIONS; i++)
4655         {
4656           int x1 = x + xy[i][0];
4657           int y1 = y + xy[i][1];
4658
4659           if (!IN_LEV_FIELD(x1, y1) || !IS_FREE(x1, y1))
4660           {
4661             if (element == EL_BUG || element == EL_BD_BUTTERFLY)
4662             {
4663               MovDir[x][y] = direction[0][i];
4664               break;
4665             }
4666             else if (element == EL_SPACESHIP || element == EL_BD_FIREFLY ||
4667                      element == EL_SP_SNIKSNAK || element == EL_SP_ELECTRON)
4668             {
4669               MovDir[x][y] = direction[1][i];
4670               break;
4671             }
4672           }
4673         }
4674       }
4675       break;
4676   }
4677
4678   GfxDir[x][y] = MovDir[x][y];
4679 }
4680
4681 void InitAmoebaNr(int x, int y)
4682 {
4683   int i;
4684   int group_nr = AmoebaNeighbourNr(x, y);
4685
4686   if (group_nr == 0)
4687   {
4688     for (i = 1; i < MAX_NUM_AMOEBA; i++)
4689     {
4690       if (AmoebaCnt[i] == 0)
4691       {
4692         group_nr = i;
4693         break;
4694       }
4695     }
4696   }
4697
4698   AmoebaNr[x][y] = group_nr;
4699   AmoebaCnt[group_nr]++;
4700   AmoebaCnt2[group_nr]++;
4701 }
4702
4703 static void LevelSolved(void)
4704 {
4705   if (level.game_engine_type == GAME_ENGINE_TYPE_RND &&
4706       game.players_still_needed > 0)
4707     return;
4708
4709   game.LevelSolved = TRUE;
4710   game.GameOver = TRUE;
4711 }
4712
4713 void GameWon(void)
4714 {
4715   static int time_count_steps;
4716   static int time, time_final;
4717   static float score, score_final; // needed for time score < 10 for 10 seconds
4718   static int health, health_final;
4719   static int game_over_delay_1 = 0;
4720   static int game_over_delay_2 = 0;
4721   static int game_over_delay_3 = 0;
4722   int time_score_base = MIN(MAX(1, level.time_score_base), 10);
4723   float time_score = (float)level.score[SC_TIME_BONUS] / time_score_base;
4724
4725   if (!game.LevelSolved_GameWon)
4726   {
4727     int i;
4728
4729     // do not start end game actions before the player stops moving (to exit)
4730     if (local_player->active && local_player->MovPos)
4731       return;
4732
4733     game.time_final = (game.no_time_limit ? TimePlayed : TimeLeft);
4734     game.score_time_final = (level.use_step_counter ? TimePlayed :
4735                              TimePlayed * FRAMES_PER_SECOND + TimeFrames);
4736
4737     game.score_final = (level.game_engine_type == GAME_ENGINE_TYPE_EM ?
4738                         game_em.lev->score :
4739                         level.game_engine_type == GAME_ENGINE_TYPE_MM ?
4740                         game_mm.score :
4741                         game.score);
4742
4743     game.health_final = (level.game_engine_type == GAME_ENGINE_TYPE_MM ?
4744                          MM_HEALTH(game_mm.laser_overload_value) :
4745                          game.health);
4746
4747     game.LevelSolved_CountingTime = game.time_final;
4748     game.LevelSolved_CountingScore = game.score_final;
4749     game.LevelSolved_CountingHealth = game.health_final;
4750
4751     game.LevelSolved_GameWon = TRUE;
4752     game.LevelSolved_SaveTape = tape.recording;
4753     game.LevelSolved_SaveScore = !tape.playing;
4754
4755     if (!tape.playing)
4756     {
4757       LevelStats_incSolved(level_nr);
4758
4759       SaveLevelSetup_SeriesInfo();
4760     }
4761
4762     if (tape.auto_play)         // tape might already be stopped here
4763       tape.auto_play_level_solved = TRUE;
4764
4765     TapeStop();
4766
4767     game_over_delay_1 = FRAMES_PER_SECOND;      // delay before counting time
4768     game_over_delay_2 = FRAMES_PER_SECOND / 2;  // delay before counting health
4769     game_over_delay_3 = FRAMES_PER_SECOND;      // delay before ending the game
4770
4771     time = time_final = game.time_final;
4772     score = score_final = game.score_final;
4773     health = health_final = game.health_final;
4774
4775     if (time_score > 0)
4776     {
4777       int time_final_max = 999;
4778       int time_frames_final_max = time_final_max * FRAMES_PER_SECOND;
4779       int time_frames = 0;
4780       int time_frames_left = TimeLeft * FRAMES_PER_SECOND - TimeFrames;
4781       int time_frames_played = TimePlayed * FRAMES_PER_SECOND + TimeFrames;
4782
4783       if (TimeLeft > 0)
4784       {
4785         time_final = 0;
4786         time_frames = time_frames_left;
4787       }
4788       else if (game.no_time_limit && TimePlayed < time_final_max)
4789       {
4790         time_final = time_final_max;
4791         time_frames = time_frames_final_max - time_frames_played;
4792       }
4793
4794       score_final += time_score * time_frames / FRAMES_PER_SECOND + 0.5;
4795
4796       time_count_steps = MAX(1, ABS(time_final - time) / 100);
4797
4798       if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
4799       {
4800         health_final = 0;
4801         score_final += health * time_score;
4802       }
4803
4804       game.score_final = score_final;
4805       game.health_final = health_final;
4806     }
4807
4808     if (level_editor_test_game || !setup.count_score_after_game)
4809     {
4810       time = time_final;
4811       score = score_final;
4812
4813       game.LevelSolved_CountingTime = time;
4814       game.LevelSolved_CountingScore = score;
4815
4816       game_panel_controls[GAME_PANEL_TIME].value = time;
4817       game_panel_controls[GAME_PANEL_SCORE].value = score;
4818
4819       DisplayGameControlValues();
4820     }
4821
4822     if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
4823     {
4824       // check if last player has left the level
4825       if (game.exit_x >= 0 &&
4826           game.exit_y >= 0)
4827       {
4828         int x = game.exit_x;
4829         int y = game.exit_y;
4830         int element = Tile[x][y];
4831
4832         // close exit door after last player
4833         if ((game.all_players_gone &&
4834              (element == EL_EXIT_OPEN ||
4835               element == EL_SP_EXIT_OPEN ||
4836               element == EL_STEEL_EXIT_OPEN)) ||
4837             element == EL_EM_EXIT_OPEN ||
4838             element == EL_EM_STEEL_EXIT_OPEN)
4839         {
4840
4841           Tile[x][y] =
4842             (element == EL_EXIT_OPEN            ? EL_EXIT_CLOSING :
4843              element == EL_EM_EXIT_OPEN         ? EL_EM_EXIT_CLOSING :
4844              element == EL_SP_EXIT_OPEN         ? EL_SP_EXIT_CLOSING:
4845              element == EL_STEEL_EXIT_OPEN      ? EL_STEEL_EXIT_CLOSING:
4846              EL_EM_STEEL_EXIT_CLOSING);
4847
4848           PlayLevelSoundElementAction(x, y, element, ACTION_CLOSING);
4849         }
4850
4851         // player disappears
4852         DrawLevelField(x, y);
4853       }
4854
4855       for (i = 0; i < MAX_PLAYERS; i++)
4856       {
4857         struct PlayerInfo *player = &stored_player[i];
4858
4859         if (player->present)
4860         {
4861           RemovePlayer(player);
4862
4863           // player disappears
4864           DrawLevelField(player->jx, player->jy);
4865         }
4866       }
4867     }
4868
4869     PlaySound(SND_GAME_WINNING);
4870   }
4871
4872   if (setup.count_score_after_game)
4873   {
4874     if (time != time_final)
4875     {
4876       if (game_over_delay_1 > 0)
4877       {
4878         game_over_delay_1--;
4879
4880         return;
4881       }
4882
4883       int time_to_go = ABS(time_final - time);
4884       int time_count_dir = (time < time_final ? +1 : -1);
4885
4886       if (time_to_go < time_count_steps)
4887         time_count_steps = 1;
4888
4889       time  += time_count_steps * time_count_dir;
4890       score += time_count_steps * time_score;
4891
4892       // set final score to correct rounding differences after counting score
4893       if (time == time_final)
4894         score = score_final;
4895
4896       game.LevelSolved_CountingTime = time;
4897       game.LevelSolved_CountingScore = score;
4898
4899       game_panel_controls[GAME_PANEL_TIME].value = time;
4900       game_panel_controls[GAME_PANEL_SCORE].value = score;
4901
4902       DisplayGameControlValues();
4903
4904       if (time == time_final)
4905         StopSound(SND_GAME_LEVELTIME_BONUS);
4906       else if (setup.sound_loops)
4907         PlaySoundLoop(SND_GAME_LEVELTIME_BONUS);
4908       else
4909         PlaySound(SND_GAME_LEVELTIME_BONUS);
4910
4911       return;
4912     }
4913
4914     if (health != health_final)
4915     {
4916       if (game_over_delay_2 > 0)
4917       {
4918         game_over_delay_2--;
4919
4920         return;
4921       }
4922
4923       int health_count_dir = (health < health_final ? +1 : -1);
4924
4925       health += health_count_dir;
4926       score  += time_score;
4927
4928       game.LevelSolved_CountingHealth = health;
4929       game.LevelSolved_CountingScore = score;
4930
4931       game_panel_controls[GAME_PANEL_HEALTH].value = health;
4932       game_panel_controls[GAME_PANEL_SCORE].value = score;
4933
4934       DisplayGameControlValues();
4935
4936       if (health == health_final)
4937         StopSound(SND_GAME_LEVELTIME_BONUS);
4938       else if (setup.sound_loops)
4939         PlaySoundLoop(SND_GAME_LEVELTIME_BONUS);
4940       else
4941         PlaySound(SND_GAME_LEVELTIME_BONUS);
4942
4943       return;
4944     }
4945   }
4946
4947   game.panel.active = FALSE;
4948
4949   if (game_over_delay_3 > 0)
4950   {
4951     game_over_delay_3--;
4952
4953     return;
4954   }
4955
4956   GameEnd();
4957 }
4958
4959 void GameEnd(void)
4960 {
4961   // used instead of "level_nr" (needed for network games)
4962   int last_level_nr = levelset.level_nr;
4963
4964   game.LevelSolved_GameEnd = TRUE;
4965
4966   if (game.LevelSolved_SaveTape)
4967   {
4968     // make sure that request dialog to save tape does not open door again
4969     if (!global.use_envelope_request)
4970       CloseDoor(DOOR_CLOSE_1);
4971
4972     SaveTapeChecked_LevelSolved(tape.level_nr);         // ask to save tape
4973
4974     // set unique basename for score tape (also saved in high score table)
4975     strcpy(tape.score_tape_basename, getScoreTapeBasename(setup.player_name));
4976   }
4977
4978   // if no tape is to be saved, close both doors simultaneously
4979   CloseDoor(DOOR_CLOSE_ALL);
4980
4981   if (level_editor_test_game)
4982   {
4983     SetGameStatus(GAME_MODE_MAIN);
4984
4985     DrawMainMenu();
4986
4987     return;
4988   }
4989
4990   if (!game.LevelSolved_SaveScore)
4991   {
4992     SetGameStatus(GAME_MODE_MAIN);
4993
4994     DrawMainMenu();
4995
4996     return;
4997   }
4998
4999   if (level_nr == leveldir_current->handicap_level)
5000   {
5001     leveldir_current->handicap_level++;
5002
5003     SaveLevelSetup_SeriesInfo();
5004   }
5005
5006   // save score and score tape before potentially erasing tape below
5007   NewHighScore(last_level_nr);
5008
5009   if (setup.increment_levels &&
5010       level_nr < leveldir_current->last_level &&
5011       !network_playing)
5012   {
5013     level_nr++;         // advance to next level
5014     TapeErase();        // start with empty tape
5015
5016     if (setup.auto_play_next_level)
5017     {
5018       LoadLevel(level_nr);
5019
5020       SaveLevelSetup_SeriesInfo();
5021     }
5022   }
5023
5024   if (scores.last_added >= 0 && setup.show_scores_after_game)
5025   {
5026     SetGameStatus(GAME_MODE_SCORES);
5027
5028     DrawHallOfFame(last_level_nr);
5029   }
5030   else if (setup.auto_play_next_level && setup.increment_levels &&
5031            last_level_nr < leveldir_current->last_level &&
5032            !network_playing)
5033   {
5034     StartGameActions(network.enabled, setup.autorecord, level.random_seed);
5035   }
5036   else
5037   {
5038     SetGameStatus(GAME_MODE_MAIN);
5039
5040     DrawMainMenu();
5041   }
5042 }
5043
5044 static int addScoreEntry(struct ScoreInfo *list, struct ScoreEntry *new_entry,
5045                          boolean one_score_entry_per_name)
5046 {
5047   int i;
5048
5049   if (strEqual(new_entry->name, EMPTY_PLAYER_NAME))
5050     return -1;
5051
5052   for (i = 0; i < MAX_SCORE_ENTRIES; i++)
5053   {
5054     struct ScoreEntry *entry = &list->entry[i];
5055     boolean score_is_better = (new_entry->score >  entry->score);
5056     boolean score_is_equal  = (new_entry->score == entry->score);
5057     boolean time_is_better  = (new_entry->time  <  entry->time);
5058     boolean time_is_equal   = (new_entry->time  == entry->time);
5059     boolean better_by_score = (score_is_better ||
5060                                (score_is_equal && time_is_better));
5061     boolean better_by_time  = (time_is_better ||
5062                                (time_is_equal && score_is_better));
5063     boolean is_better = (level.rate_time_over_score ? better_by_time :
5064                          better_by_score);
5065     boolean entry_is_empty = (entry->score == 0 &&
5066                               entry->time == 0);
5067
5068     // prevent adding server score entries if also existing in local score file
5069     // (special case: historic score entries have an empty tape basename entry)
5070     if (strEqual(new_entry->tape_basename, entry->tape_basename) &&
5071         !strEqual(new_entry->tape_basename, UNDEFINED_FILENAME))
5072       return -1;
5073
5074     if (is_better || entry_is_empty)
5075     {
5076       // player has made it to the hall of fame
5077
5078       if (i < MAX_SCORE_ENTRIES - 1)
5079       {
5080         int m = MAX_SCORE_ENTRIES - 1;
5081         int l;
5082
5083         if (one_score_entry_per_name)
5084         {
5085           for (l = i; l < MAX_SCORE_ENTRIES; l++)
5086             if (strEqual(list->entry[l].name, new_entry->name))
5087               m = l;
5088
5089           if (m == i)   // player's new highscore overwrites his old one
5090             goto put_into_list;
5091         }
5092
5093         for (l = m; l > i; l--)
5094           list->entry[l] = list->entry[l - 1];
5095       }
5096
5097       put_into_list:
5098
5099       *entry = *new_entry;
5100
5101       return i;
5102     }
5103     else if (one_score_entry_per_name &&
5104              strEqual(entry->name, new_entry->name))
5105     {
5106       // player already in high score list with better score or time
5107
5108       return -1;
5109     }
5110   }
5111
5112   return -1;
5113 }
5114
5115 void NewHighScore(int level_nr)
5116 {
5117   struct ScoreEntry new_entry = {{ 0 }}; // (prevent warning from GCC bug 53119)
5118   boolean one_per_name = FALSE;
5119
5120   strncpy(new_entry.tape_basename, tape.score_tape_basename, MAX_FILENAME_LEN);
5121   strncpy(new_entry.name, setup.player_name, MAX_PLAYER_NAME_LEN);
5122
5123   new_entry.score = game.score_final;
5124   new_entry.time = game.score_time_final;
5125
5126   LoadScore(level_nr);
5127
5128   scores.last_added = addScoreEntry(&scores, &new_entry, one_per_name);
5129
5130   if (scores.last_added >= 0)
5131   {
5132     SaveScore(level_nr);
5133
5134     // store last added local score entry (before merging server scores)
5135     scores.last_added_local = scores.last_added;
5136   }
5137
5138   if (game.LevelSolved_SaveTape)
5139   {
5140     SaveScoreTape(level_nr);
5141     SaveServerScore(level_nr);
5142   }
5143 }
5144
5145 void MergeServerScore(void)
5146 {
5147   struct ScoreEntry last_added_entry;
5148   boolean one_per_name = FALSE;
5149   int i;
5150
5151   if (scores.last_added >= 0)
5152     last_added_entry = scores.entry[scores.last_added];
5153
5154   for (i = 0; i < server_scores.num_entries; i++)
5155   {
5156     int pos = addScoreEntry(&scores, &server_scores.entry[i], one_per_name);
5157
5158     if (pos >= 0 && pos <= scores.last_added)
5159       scores.last_added++;
5160   }
5161
5162   if (scores.last_added >= MAX_SCORE_ENTRIES)
5163   {
5164     scores.last_added = MAX_SCORE_ENTRIES - 1;
5165     scores.force_last_added = TRUE;
5166
5167     scores.entry[scores.last_added] = last_added_entry;
5168   }
5169 }
5170
5171 static int getElementMoveStepsizeExt(int x, int y, int direction)
5172 {
5173   int element = Tile[x][y];
5174   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
5175   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
5176   int horiz_move = (dx != 0);
5177   int sign = (horiz_move ? dx : dy);
5178   int step = sign * element_info[element].move_stepsize;
5179
5180   // special values for move stepsize for spring and things on conveyor belt
5181   if (horiz_move)
5182   {
5183     if (CAN_FALL(element) &&
5184         y < lev_fieldy - 1 && IS_BELT_ACTIVE(Tile[x][y + 1]))
5185       step = sign * MOVE_STEPSIZE_NORMAL / 2;
5186     else if (element == EL_SPRING)
5187       step = sign * MOVE_STEPSIZE_NORMAL * 2;
5188   }
5189
5190   return step;
5191 }
5192
5193 static int getElementMoveStepsize(int x, int y)
5194 {
5195   return getElementMoveStepsizeExt(x, y, MovDir[x][y]);
5196 }
5197
5198 void InitPlayerGfxAnimation(struct PlayerInfo *player, int action, int dir)
5199 {
5200   if (player->GfxAction != action || player->GfxDir != dir)
5201   {
5202     player->GfxAction = action;
5203     player->GfxDir = dir;
5204     player->Frame = 0;
5205     player->StepFrame = 0;
5206   }
5207 }
5208
5209 static void ResetGfxFrame(int x, int y)
5210 {
5211   // profiling showed that "autotest" spends 10~20% of its time in this function
5212   if (DrawingDeactivatedField())
5213     return;
5214
5215   int element = Tile[x][y];
5216   int graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
5217
5218   if (graphic_info[graphic].anim_global_sync)
5219     GfxFrame[x][y] = FrameCounter;
5220   else if (ANIM_MODE(graphic) == ANIM_CE_VALUE)
5221     GfxFrame[x][y] = CustomValue[x][y];
5222   else if (ANIM_MODE(graphic) == ANIM_CE_SCORE)
5223     GfxFrame[x][y] = element_info[element].collect_score;
5224   else if (ANIM_MODE(graphic) == ANIM_CE_DELAY)
5225     GfxFrame[x][y] = ChangeDelay[x][y];
5226 }
5227
5228 static void ResetGfxAnimation(int x, int y)
5229 {
5230   GfxAction[x][y] = ACTION_DEFAULT;
5231   GfxDir[x][y] = MovDir[x][y];
5232   GfxFrame[x][y] = 0;
5233
5234   ResetGfxFrame(x, y);
5235 }
5236
5237 static void ResetRandomAnimationValue(int x, int y)
5238 {
5239   GfxRandom[x][y] = INIT_GFX_RANDOM();
5240 }
5241
5242 static void InitMovingField(int x, int y, int direction)
5243 {
5244   int element = Tile[x][y];
5245   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
5246   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
5247   int newx = x + dx;
5248   int newy = y + dy;
5249   boolean is_moving_before, is_moving_after;
5250
5251   // check if element was/is moving or being moved before/after mode change
5252   is_moving_before = (WasJustMoving[x][y] != 0);
5253   is_moving_after  = (getElementMoveStepsizeExt(x, y, direction)    != 0);
5254
5255   // reset animation only for moving elements which change direction of moving
5256   // or which just started or stopped moving
5257   // (else CEs with property "can move" / "not moving" are reset each frame)
5258   if (is_moving_before != is_moving_after ||
5259       direction != MovDir[x][y])
5260     ResetGfxAnimation(x, y);
5261
5262   MovDir[x][y] = direction;
5263   GfxDir[x][y] = direction;
5264
5265   GfxAction[x][y] = (!is_moving_after ? ACTION_WAITING :
5266                      direction == MV_DOWN && CAN_FALL(element) ?
5267                      ACTION_FALLING : ACTION_MOVING);
5268
5269   // this is needed for CEs with property "can move" / "not moving"
5270
5271   if (is_moving_after)
5272   {
5273     if (Tile[newx][newy] == EL_EMPTY)
5274       Tile[newx][newy] = EL_BLOCKED;
5275
5276     MovDir[newx][newy] = MovDir[x][y];
5277
5278     CustomValue[newx][newy] = CustomValue[x][y];
5279
5280     GfxFrame[newx][newy] = GfxFrame[x][y];
5281     GfxRandom[newx][newy] = GfxRandom[x][y];
5282     GfxAction[newx][newy] = GfxAction[x][y];
5283     GfxDir[newx][newy] = GfxDir[x][y];
5284   }
5285 }
5286
5287 void Moving2Blocked(int x, int y, int *goes_to_x, int *goes_to_y)
5288 {
5289   int direction = MovDir[x][y];
5290   int newx = x + (direction & MV_LEFT ? -1 : direction & MV_RIGHT ? +1 : 0);
5291   int newy = y + (direction & MV_UP   ? -1 : direction & MV_DOWN  ? +1 : 0);
5292
5293   *goes_to_x = newx;
5294   *goes_to_y = newy;
5295 }
5296
5297 void Blocked2Moving(int x, int y, int *comes_from_x, int *comes_from_y)
5298 {
5299   int oldx = x, oldy = y;
5300   int direction = MovDir[x][y];
5301
5302   if (direction == MV_LEFT)
5303     oldx++;
5304   else if (direction == MV_RIGHT)
5305     oldx--;
5306   else if (direction == MV_UP)
5307     oldy++;
5308   else if (direction == MV_DOWN)
5309     oldy--;
5310
5311   *comes_from_x = oldx;
5312   *comes_from_y = oldy;
5313 }
5314
5315 static int MovingOrBlocked2Element(int x, int y)
5316 {
5317   int element = Tile[x][y];
5318
5319   if (element == EL_BLOCKED)
5320   {
5321     int oldx, oldy;
5322
5323     Blocked2Moving(x, y, &oldx, &oldy);
5324     return Tile[oldx][oldy];
5325   }
5326   else
5327     return element;
5328 }
5329
5330 static int MovingOrBlocked2ElementIfNotLeaving(int x, int y)
5331 {
5332   // like MovingOrBlocked2Element(), but if element is moving
5333   // and (x,y) is the field the moving element is just leaving,
5334   // return EL_BLOCKED instead of the element value
5335   int element = Tile[x][y];
5336
5337   if (IS_MOVING(x, y))
5338   {
5339     if (element == EL_BLOCKED)
5340     {
5341       int oldx, oldy;
5342
5343       Blocked2Moving(x, y, &oldx, &oldy);
5344       return Tile[oldx][oldy];
5345     }
5346     else
5347       return EL_BLOCKED;
5348   }
5349   else
5350     return element;
5351 }
5352
5353 static void RemoveField(int x, int y)
5354 {
5355   Tile[x][y] = EL_EMPTY;
5356
5357   MovPos[x][y] = 0;
5358   MovDir[x][y] = 0;
5359   MovDelay[x][y] = 0;
5360
5361   CustomValue[x][y] = 0;
5362
5363   AmoebaNr[x][y] = 0;
5364   ChangeDelay[x][y] = 0;
5365   ChangePage[x][y] = -1;
5366   Pushed[x][y] = FALSE;
5367
5368   GfxElement[x][y] = EL_UNDEFINED;
5369   GfxAction[x][y] = ACTION_DEFAULT;
5370   GfxDir[x][y] = MV_NONE;
5371 }
5372
5373 static void RemoveMovingField(int x, int y)
5374 {
5375   int oldx = x, oldy = y, newx = x, newy = y;
5376   int element = Tile[x][y];
5377   int next_element = EL_UNDEFINED;
5378
5379   if (element != EL_BLOCKED && !IS_MOVING(x, y))
5380     return;
5381
5382   if (IS_MOVING(x, y))
5383   {
5384     Moving2Blocked(x, y, &newx, &newy);
5385
5386     if (Tile[newx][newy] != EL_BLOCKED)
5387     {
5388       // element is moving, but target field is not free (blocked), but
5389       // already occupied by something different (example: acid pool);
5390       // in this case, only remove the moving field, but not the target
5391
5392       RemoveField(oldx, oldy);
5393
5394       Store[oldx][oldy] = Store2[oldx][oldy] = 0;
5395
5396       TEST_DrawLevelField(oldx, oldy);
5397
5398       return;
5399     }
5400   }
5401   else if (element == EL_BLOCKED)
5402   {
5403     Blocked2Moving(x, y, &oldx, &oldy);
5404     if (!IS_MOVING(oldx, oldy))
5405       return;
5406   }
5407
5408   if (element == EL_BLOCKED &&
5409       (Tile[oldx][oldy] == EL_QUICKSAND_EMPTYING ||
5410        Tile[oldx][oldy] == EL_QUICKSAND_FAST_EMPTYING ||
5411        Tile[oldx][oldy] == EL_MAGIC_WALL_EMPTYING ||
5412        Tile[oldx][oldy] == EL_BD_MAGIC_WALL_EMPTYING ||
5413        Tile[oldx][oldy] == EL_DC_MAGIC_WALL_EMPTYING ||
5414        Tile[oldx][oldy] == EL_AMOEBA_DROPPING))
5415     next_element = get_next_element(Tile[oldx][oldy]);
5416
5417   RemoveField(oldx, oldy);
5418   RemoveField(newx, newy);
5419
5420   Store[oldx][oldy] = Store2[oldx][oldy] = 0;
5421
5422   if (next_element != EL_UNDEFINED)
5423     Tile[oldx][oldy] = next_element;
5424
5425   TEST_DrawLevelField(oldx, oldy);
5426   TEST_DrawLevelField(newx, newy);
5427 }
5428
5429 void DrawDynamite(int x, int y)
5430 {
5431   int sx = SCREENX(x), sy = SCREENY(y);
5432   int graphic = el2img(Tile[x][y]);
5433   int frame;
5434
5435   if (!IN_SCR_FIELD(sx, sy) || IS_PLAYER(x, y))
5436     return;
5437
5438   if (IS_WALKABLE_INSIDE(Back[x][y]))
5439     return;
5440
5441   if (Back[x][y])
5442     DrawLevelElement(x, y, Back[x][y]);
5443   else if (Store[x][y])
5444     DrawLevelElement(x, y, Store[x][y]);
5445   else if (game.use_masked_elements)
5446     DrawLevelElement(x, y, EL_EMPTY);
5447
5448   frame = getGraphicAnimationFrame(graphic, GfxFrame[x][y]);
5449
5450   if (Back[x][y] || Store[x][y] || game.use_masked_elements)
5451     DrawGraphicThruMask(sx, sy, graphic, frame);
5452   else
5453     DrawGraphic(sx, sy, graphic, frame);
5454 }
5455
5456 static void CheckDynamite(int x, int y)
5457 {
5458   if (MovDelay[x][y] != 0)      // dynamite is still waiting to explode
5459   {
5460     MovDelay[x][y]--;
5461
5462     if (MovDelay[x][y] != 0)
5463     {
5464       DrawDynamite(x, y);
5465       PlayLevelSoundActionIfLoop(x, y, ACTION_ACTIVE);
5466
5467       return;
5468     }
5469   }
5470
5471   StopLevelSoundActionIfLoop(x, y, ACTION_ACTIVE);
5472
5473   Bang(x, y);
5474 }
5475
5476 static void setMinimalPlayerBoundaries(int *sx1, int *sy1, int *sx2, int *sy2)
5477 {
5478   boolean num_checked_players = 0;
5479   int i;
5480
5481   for (i = 0; i < MAX_PLAYERS; i++)
5482   {
5483     if (stored_player[i].active)
5484     {
5485       int sx = stored_player[i].jx;
5486       int sy = stored_player[i].jy;
5487
5488       if (num_checked_players == 0)
5489       {
5490         *sx1 = *sx2 = sx;
5491         *sy1 = *sy2 = sy;
5492       }
5493       else
5494       {
5495         *sx1 = MIN(*sx1, sx);
5496         *sy1 = MIN(*sy1, sy);
5497         *sx2 = MAX(*sx2, sx);
5498         *sy2 = MAX(*sy2, sy);
5499       }
5500
5501       num_checked_players++;
5502     }
5503   }
5504 }
5505
5506 static boolean checkIfAllPlayersFitToScreen_RND(void)
5507 {
5508   int sx1 = 0, sy1 = 0, sx2 = 0, sy2 = 0;
5509
5510   setMinimalPlayerBoundaries(&sx1, &sy1, &sx2, &sy2);
5511
5512   return (sx2 - sx1 < SCR_FIELDX &&
5513           sy2 - sy1 < SCR_FIELDY);
5514 }
5515
5516 static void setScreenCenteredToAllPlayers(int *sx, int *sy)
5517 {
5518   int sx1 = scroll_x, sy1 = scroll_y, sx2 = scroll_x, sy2 = scroll_y;
5519
5520   setMinimalPlayerBoundaries(&sx1, &sy1, &sx2, &sy2);
5521
5522   *sx = (sx1 + sx2) / 2;
5523   *sy = (sy1 + sy2) / 2;
5524 }
5525
5526 static void DrawRelocateScreen(int old_x, int old_y, int x, int y, int move_dir,
5527                                boolean center_screen, boolean quick_relocation)
5528 {
5529   unsigned int frame_delay_value_old = GetVideoFrameDelay();
5530   boolean ffwd_delay = (tape.playing && tape.fast_forward);
5531   boolean no_delay = (tape.warp_forward);
5532   int frame_delay_value = (ffwd_delay ? FfwdFrameDelay : GameFrameDelay);
5533   int wait_delay_value = (no_delay ? 0 : frame_delay_value);
5534   int new_scroll_x, new_scroll_y;
5535
5536   if (level.lazy_relocation && IN_VIS_FIELD(SCREENX(x), SCREENY(y)))
5537   {
5538     // case 1: quick relocation inside visible screen (without scrolling)
5539
5540     RedrawPlayfield();
5541
5542     return;
5543   }
5544
5545   if (!level.shifted_relocation || center_screen)
5546   {
5547     // relocation _with_ centering of screen
5548
5549     new_scroll_x = SCROLL_POSITION_X(x);
5550     new_scroll_y = SCROLL_POSITION_Y(y);
5551   }
5552   else
5553   {
5554     // relocation _without_ centering of screen
5555
5556     int center_scroll_x = SCROLL_POSITION_X(old_x);
5557     int center_scroll_y = SCROLL_POSITION_Y(old_y);
5558     int offset_x = x + (scroll_x - center_scroll_x);
5559     int offset_y = y + (scroll_y - center_scroll_y);
5560
5561     // for new screen position, apply previous offset to center position
5562     new_scroll_x = SCROLL_POSITION_X(offset_x);
5563     new_scroll_y = SCROLL_POSITION_Y(offset_y);
5564   }
5565
5566   if (quick_relocation)
5567   {
5568     // case 2: quick relocation (redraw without visible scrolling)
5569
5570     scroll_x = new_scroll_x;
5571     scroll_y = new_scroll_y;
5572
5573     RedrawPlayfield();
5574
5575     return;
5576   }
5577
5578   // case 3: visible relocation (with scrolling to new position)
5579
5580   ScrollScreen(NULL, SCROLL_GO_ON);     // scroll last frame to full tile
5581
5582   SetVideoFrameDelay(wait_delay_value);
5583
5584   while (scroll_x != new_scroll_x || scroll_y != new_scroll_y)
5585   {
5586     int dx = (new_scroll_x < scroll_x ? +1 : new_scroll_x > scroll_x ? -1 : 0);
5587     int dy = (new_scroll_y < scroll_y ? +1 : new_scroll_y > scroll_y ? -1 : 0);
5588
5589     if (dx == 0 && dy == 0)             // no scrolling needed at all
5590       break;
5591
5592     scroll_x -= dx;
5593     scroll_y -= dy;
5594
5595     // set values for horizontal/vertical screen scrolling (half tile size)
5596     int dir_x = (dx != 0 ? MV_HORIZONTAL : 0);
5597     int dir_y = (dy != 0 ? MV_VERTICAL   : 0);
5598     int pos_x = dx * TILEX / 2;
5599     int pos_y = dy * TILEY / 2;
5600     int fx = getFieldbufferOffsetX_RND(dir_x, pos_x);
5601     int fy = getFieldbufferOffsetY_RND(dir_y, pos_y);
5602
5603     ScrollLevel(dx, dy);
5604     DrawAllPlayers();
5605
5606     // scroll in two steps of half tile size to make things smoother
5607     BlitScreenToBitmapExt_RND(window, fx, fy);
5608
5609     // scroll second step to align at full tile size
5610     BlitScreenToBitmap(window);
5611   }
5612
5613   DrawAllPlayers();
5614   BackToFront();
5615
5616   SetVideoFrameDelay(frame_delay_value_old);
5617 }
5618
5619 static void RelocatePlayer(int jx, int jy, int el_player_raw)
5620 {
5621   int el_player = GET_PLAYER_ELEMENT(el_player_raw);
5622   int player_nr = GET_PLAYER_NR(el_player);
5623   struct PlayerInfo *player = &stored_player[player_nr];
5624   boolean ffwd_delay = (tape.playing && tape.fast_forward);
5625   boolean no_delay = (tape.warp_forward);
5626   int frame_delay_value = (ffwd_delay ? FfwdFrameDelay : GameFrameDelay);
5627   int wait_delay_value = (no_delay ? 0 : frame_delay_value);
5628   int old_jx = player->jx;
5629   int old_jy = player->jy;
5630   int old_element = Tile[old_jx][old_jy];
5631   int element = Tile[jx][jy];
5632   boolean player_relocated = (old_jx != jx || old_jy != jy);
5633
5634   int move_dir_horiz = (jx < old_jx ? MV_LEFT : jx > old_jx ? MV_RIGHT : 0);
5635   int move_dir_vert  = (jy < old_jy ? MV_UP   : jy > old_jy ? MV_DOWN  : 0);
5636   int enter_side_horiz = MV_DIR_OPPOSITE(move_dir_horiz);
5637   int enter_side_vert  = MV_DIR_OPPOSITE(move_dir_vert);
5638   int leave_side_horiz = move_dir_horiz;
5639   int leave_side_vert  = move_dir_vert;
5640   int enter_side = enter_side_horiz | enter_side_vert;
5641   int leave_side = leave_side_horiz | leave_side_vert;
5642
5643   if (player->buried)           // do not reanimate dead player
5644     return;
5645
5646   if (!player_relocated)        // no need to relocate the player
5647     return;
5648
5649   if (IS_PLAYER(jx, jy))        // player already placed at new position
5650   {
5651     RemoveField(jx, jy);        // temporarily remove newly placed player
5652     DrawLevelField(jx, jy);
5653   }
5654
5655   if (player->present)
5656   {
5657     while (player->MovPos)
5658     {
5659       ScrollPlayer(player, SCROLL_GO_ON);
5660       ScrollScreen(NULL, SCROLL_GO_ON);
5661
5662       AdvanceFrameAndPlayerCounters(player->index_nr);
5663
5664       DrawPlayer(player);
5665
5666       BackToFront_WithFrameDelay(wait_delay_value);
5667     }
5668
5669     DrawPlayer(player);         // needed here only to cleanup last field
5670     DrawLevelField(player->jx, player->jy);     // remove player graphic
5671
5672     player->is_moving = FALSE;
5673   }
5674
5675   if (IS_CUSTOM_ELEMENT(old_element))
5676     CheckElementChangeByPlayer(old_jx, old_jy, old_element,
5677                                CE_LEFT_BY_PLAYER,
5678                                player->index_bit, leave_side);
5679
5680   CheckTriggeredElementChangeByPlayer(old_jx, old_jy, old_element,
5681                                       CE_PLAYER_LEAVES_X,
5682                                       player->index_bit, leave_side);
5683
5684   Tile[jx][jy] = el_player;
5685   InitPlayerField(jx, jy, el_player, TRUE);
5686
5687   /* "InitPlayerField()" above sets Tile[jx][jy] to EL_EMPTY, but it may be
5688      possible that the relocation target field did not contain a player element,
5689      but a walkable element, to which the new player was relocated -- in this
5690      case, restore that (already initialized!) element on the player field */
5691   if (!ELEM_IS_PLAYER(element)) // player may be set on walkable element
5692   {
5693     Tile[jx][jy] = element;     // restore previously existing element
5694   }
5695
5696   // only visually relocate centered player
5697   DrawRelocateScreen(old_jx, old_jy, player->jx, player->jy, player->MovDir,
5698                      FALSE, level.instant_relocation);
5699
5700   TestIfPlayerTouchesBadThing(jx, jy);
5701   TestIfPlayerTouchesCustomElement(jx, jy);
5702
5703   if (IS_CUSTOM_ELEMENT(element))
5704     CheckElementChangeByPlayer(jx, jy, element, CE_ENTERED_BY_PLAYER,
5705                                player->index_bit, enter_side);
5706
5707   CheckTriggeredElementChangeByPlayer(jx, jy, element, CE_PLAYER_ENTERS_X,
5708                                       player->index_bit, enter_side);
5709
5710   if (player->is_switching)
5711   {
5712     /* ensure that relocation while still switching an element does not cause
5713        a new element to be treated as also switched directly after relocation
5714        (this is important for teleporter switches that teleport the player to
5715        a place where another teleporter switch is in the same direction, which
5716        would then incorrectly be treated as immediately switched before the
5717        direction key that caused the switch was released) */
5718
5719     player->switch_x += jx - old_jx;
5720     player->switch_y += jy - old_jy;
5721   }
5722 }
5723
5724 static void Explode(int ex, int ey, int phase, int mode)
5725 {
5726   int x, y;
5727   int last_phase;
5728   int border_element;
5729
5730   // !!! eliminate this variable !!!
5731   int delay = (game.emulation == EMU_SUPAPLEX ? 3 : 2);
5732
5733   if (game.explosions_delayed)
5734   {
5735     ExplodeField[ex][ey] = mode;
5736     return;
5737   }
5738
5739   if (phase == EX_PHASE_START)          // initialize 'Store[][]' field
5740   {
5741     int center_element = Tile[ex][ey];
5742     int artwork_element, explosion_element;     // set these values later
5743
5744     // remove things displayed in background while burning dynamite
5745     if (Back[ex][ey] != EL_EMPTY && !IS_INDESTRUCTIBLE(Back[ex][ey]))
5746       Back[ex][ey] = 0;
5747
5748     if (IS_MOVING(ex, ey) || IS_BLOCKED(ex, ey))
5749     {
5750       // put moving element to center field (and let it explode there)
5751       center_element = MovingOrBlocked2Element(ex, ey);
5752       RemoveMovingField(ex, ey);
5753       Tile[ex][ey] = center_element;
5754     }
5755
5756     // now "center_element" is finally determined -- set related values now
5757     artwork_element = center_element;           // for custom player artwork
5758     explosion_element = center_element;         // for custom player artwork
5759
5760     if (IS_PLAYER(ex, ey))
5761     {
5762       int player_nr = GET_PLAYER_NR(StorePlayer[ex][ey]);
5763
5764       artwork_element = stored_player[player_nr].artwork_element;
5765
5766       if (level.use_explosion_element[player_nr])
5767       {
5768         explosion_element = level.explosion_element[player_nr];
5769         artwork_element = explosion_element;
5770       }
5771     }
5772
5773     if (mode == EX_TYPE_NORMAL ||
5774         mode == EX_TYPE_CENTER ||
5775         mode == EX_TYPE_CROSS)
5776       PlayLevelSoundElementAction(ex, ey, artwork_element, ACTION_EXPLODING);
5777
5778     last_phase = element_info[explosion_element].explosion_delay + 1;
5779
5780     for (y = ey - 1; y <= ey + 1; y++) for (x = ex - 1; x <= ex + 1; x++)
5781     {
5782       int xx = x - ex + 1;
5783       int yy = y - ey + 1;
5784       int element;
5785
5786       if (!IN_LEV_FIELD(x, y) ||
5787           (mode & EX_TYPE_SINGLE_TILE && (x != ex || y != ey)) ||
5788           (mode == EX_TYPE_CROSS      && (x != ex && y != ey)))
5789         continue;
5790
5791       element = Tile[x][y];
5792
5793       if (IS_MOVING(x, y) || IS_BLOCKED(x, y))
5794       {
5795         element = MovingOrBlocked2Element(x, y);
5796
5797         if (!IS_EXPLOSION_PROOF(element))
5798           RemoveMovingField(x, y);
5799       }
5800
5801       // indestructible elements can only explode in center (but not flames)
5802       if ((IS_EXPLOSION_PROOF(element) && (x != ex || y != ey ||
5803                                            mode == EX_TYPE_BORDER)) ||
5804           element == EL_FLAMES)
5805         continue;
5806
5807       /* no idea why this was changed from 3.0.8 to 3.1.0 -- this causes buggy
5808          behaviour, for example when touching a yamyam that explodes to rocks
5809          with active deadly shield, a rock is created under the player !!! */
5810       // (case 1 (surely buggy): >= 3.1.0, case 2 (maybe buggy): <= 3.0.8)
5811 #if 0
5812       if (IS_PLAYER(x, y) && SHIELD_ON(PLAYERINFO(x, y)) &&
5813           (game.engine_version < VERSION_IDENT(3,1,0,0) ||
5814            (x == ex && y == ey && mode != EX_TYPE_BORDER)))
5815 #else
5816       if (IS_PLAYER(x, y) && SHIELD_ON(PLAYERINFO(x, y)))
5817 #endif
5818       {
5819         if (IS_ACTIVE_BOMB(element))
5820         {
5821           // re-activate things under the bomb like gate or penguin
5822           Tile[x][y] = (Back[x][y] ? Back[x][y] : EL_EMPTY);
5823           Back[x][y] = 0;
5824         }
5825
5826         continue;
5827       }
5828
5829       // save walkable background elements while explosion on same tile
5830       if (IS_WALKABLE(element) && IS_INDESTRUCTIBLE(element) &&
5831           (x != ex || y != ey || mode == EX_TYPE_BORDER))
5832         Back[x][y] = element;
5833
5834       // ignite explodable elements reached by other explosion
5835       if (element == EL_EXPLOSION)
5836         element = Store2[x][y];
5837
5838       if (AmoebaNr[x][y] &&
5839           (element == EL_AMOEBA_FULL ||
5840            element == EL_BD_AMOEBA ||
5841            element == EL_AMOEBA_GROWING))
5842       {
5843         AmoebaCnt[AmoebaNr[x][y]]--;
5844         AmoebaCnt2[AmoebaNr[x][y]]--;
5845       }
5846
5847       RemoveField(x, y);
5848
5849       if (IS_PLAYER(ex, ey) && !PLAYER_EXPLOSION_PROTECTED(ex, ey))
5850       {
5851         int player_nr = StorePlayer[ex][ey] - EL_PLAYER_1;
5852
5853         Store[x][y] = EL_PLAYER_IS_EXPLODING_1 + player_nr;
5854
5855         if (PLAYERINFO(ex, ey)->use_murphy)
5856           Store[x][y] = EL_EMPTY;
5857       }
5858
5859       // !!! check this case -- currently needed for rnd_rado_negundo_v,
5860       // !!! levels 015 018 019 020 021 022 023 026 027 028 !!!
5861       else if (ELEM_IS_PLAYER(center_element))
5862         Store[x][y] = EL_EMPTY;
5863       else if (center_element == EL_YAMYAM)
5864         Store[x][y] = level.yamyam_content[game.yamyam_content_nr].e[xx][yy];
5865       else if (element_info[center_element].content.e[xx][yy] != EL_EMPTY)
5866         Store[x][y] = element_info[center_element].content.e[xx][yy];
5867 #if 1
5868       // needed because EL_BD_BUTTERFLY is not defined as "CAN_EXPLODE"
5869       // (killing EL_BD_BUTTERFLY with dynamite would result in BD diamond
5870       // otherwise) -- FIX THIS !!!
5871       else if (!CAN_EXPLODE(element) && element != EL_BD_BUTTERFLY)
5872         Store[x][y] = element_info[element].content.e[1][1];
5873 #else
5874       else if (!CAN_EXPLODE(element))
5875         Store[x][y] = element_info[element].content.e[1][1];
5876 #endif
5877       else
5878         Store[x][y] = EL_EMPTY;
5879
5880       if (x != ex || y != ey || mode == EX_TYPE_BORDER ||
5881           center_element == EL_AMOEBA_TO_DIAMOND)
5882         Store2[x][y] = element;
5883
5884       Tile[x][y] = EL_EXPLOSION;
5885       GfxElement[x][y] = artwork_element;
5886
5887       ExplodePhase[x][y] = 1;
5888       ExplodeDelay[x][y] = last_phase;
5889
5890       Stop[x][y] = TRUE;
5891     }
5892
5893     if (center_element == EL_YAMYAM)
5894       game.yamyam_content_nr =
5895         (game.yamyam_content_nr + 1) % level.num_yamyam_contents;
5896
5897     return;
5898   }
5899
5900   if (Stop[ex][ey])
5901     return;
5902
5903   x = ex;
5904   y = ey;
5905
5906   if (phase == 1)
5907     GfxFrame[x][y] = 0;         // restart explosion animation
5908
5909   last_phase = ExplodeDelay[x][y];
5910
5911   ExplodePhase[x][y] = (phase < last_phase ? phase + 1 : 0);
5912
5913   // this can happen if the player leaves an explosion just in time
5914   if (GfxElement[x][y] == EL_UNDEFINED)
5915     GfxElement[x][y] = EL_EMPTY;
5916
5917   border_element = Store2[x][y];
5918   if (IS_PLAYER(x, y) && !PLAYER_EXPLOSION_PROTECTED(x, y))
5919     border_element = StorePlayer[x][y];
5920
5921   if (phase == element_info[border_element].ignition_delay ||
5922       phase == last_phase)
5923   {
5924     boolean border_explosion = FALSE;
5925
5926     if (IS_PLAYER(x, y) && PLAYERINFO(x, y)->present &&
5927         !PLAYER_EXPLOSION_PROTECTED(x, y))
5928     {
5929       KillPlayerUnlessExplosionProtected(x, y);
5930       border_explosion = TRUE;
5931     }
5932     else if (CAN_EXPLODE_BY_EXPLOSION(border_element))
5933     {
5934       Tile[x][y] = Store2[x][y];
5935       Store2[x][y] = 0;
5936       Bang(x, y);
5937       border_explosion = TRUE;
5938     }
5939     else if (border_element == EL_AMOEBA_TO_DIAMOND)
5940     {
5941       AmoebaToDiamond(x, y);
5942       Store2[x][y] = 0;
5943       border_explosion = TRUE;
5944     }
5945
5946     // if an element just explodes due to another explosion (chain-reaction),
5947     // do not immediately end the new explosion when it was the last frame of
5948     // the explosion (as it would be done in the following "if"-statement!)
5949     if (border_explosion && phase == last_phase)
5950       return;
5951   }
5952
5953   if (phase == last_phase)
5954   {
5955     int element;
5956
5957     element = Tile[x][y] = Store[x][y];
5958     Store[x][y] = Store2[x][y] = 0;
5959     GfxElement[x][y] = EL_UNDEFINED;
5960
5961     // player can escape from explosions and might therefore be still alive
5962     if (element >= EL_PLAYER_IS_EXPLODING_1 &&
5963         element <= EL_PLAYER_IS_EXPLODING_4)
5964     {
5965       int player_nr = element - EL_PLAYER_IS_EXPLODING_1;
5966       int explosion_element = EL_PLAYER_1 + player_nr;
5967       int xx = MIN(MAX(0, x - stored_player[player_nr].jx + 1), 2);
5968       int yy = MIN(MAX(0, y - stored_player[player_nr].jy + 1), 2);
5969
5970       if (level.use_explosion_element[player_nr])
5971         explosion_element = level.explosion_element[player_nr];
5972
5973       Tile[x][y] = (stored_player[player_nr].active ? EL_EMPTY :
5974                     element_info[explosion_element].content.e[xx][yy]);
5975     }
5976
5977     // restore probably existing indestructible background element
5978     if (Back[x][y] && IS_INDESTRUCTIBLE(Back[x][y]))
5979       element = Tile[x][y] = Back[x][y];
5980     Back[x][y] = 0;
5981
5982     MovDir[x][y] = MovPos[x][y] = MovDelay[x][y] = 0;
5983     GfxDir[x][y] = MV_NONE;
5984     ChangeDelay[x][y] = 0;
5985     ChangePage[x][y] = -1;
5986
5987     CustomValue[x][y] = 0;
5988
5989     InitField_WithBug2(x, y, FALSE);
5990
5991     TEST_DrawLevelField(x, y);
5992
5993     TestIfElementTouchesCustomElement(x, y);
5994
5995     if (GFX_CRUMBLED(element))
5996       TEST_DrawLevelFieldCrumbledNeighbours(x, y);
5997
5998     if (IS_PLAYER(x, y) && !PLAYERINFO(x, y)->present)
5999       StorePlayer[x][y] = 0;
6000
6001     if (ELEM_IS_PLAYER(element))
6002       RelocatePlayer(x, y, element);
6003   }
6004   else if (IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
6005   {
6006     int graphic = el_act2img(GfxElement[x][y], ACTION_EXPLODING);
6007     int frame = getGraphicAnimationFrame(graphic, GfxFrame[x][y]);
6008
6009     if (phase == delay)
6010       TEST_DrawLevelFieldCrumbled(x, y);
6011
6012     if (IS_WALKABLE_OVER(Back[x][y]) && Back[x][y] != EL_EMPTY)
6013     {
6014       DrawLevelElement(x, y, Back[x][y]);
6015       DrawGraphicThruMask(SCREENX(x), SCREENY(y), graphic, frame);
6016     }
6017     else if (IS_WALKABLE_UNDER(Back[x][y]))
6018     {
6019       DrawGraphic(SCREENX(x), SCREENY(y), graphic, frame);
6020       DrawLevelElementThruMask(x, y, Back[x][y]);
6021     }
6022     else if (!IS_WALKABLE_INSIDE(Back[x][y]))
6023       DrawScreenGraphic(SCREENX(x), SCREENY(y), graphic, frame);
6024   }
6025 }
6026
6027 static void DynaExplode(int ex, int ey)
6028 {
6029   int i, j;
6030   int dynabomb_element = Tile[ex][ey];
6031   int dynabomb_size = 1;
6032   boolean dynabomb_xl = FALSE;
6033   struct PlayerInfo *player;
6034   static int xy[4][2] =
6035   {
6036     { 0, -1 },
6037     { -1, 0 },
6038     { +1, 0 },
6039     { 0, +1 }
6040   };
6041
6042   if (IS_ACTIVE_BOMB(dynabomb_element))
6043   {
6044     player = &stored_player[dynabomb_element - EL_DYNABOMB_PLAYER_1_ACTIVE];
6045     dynabomb_size = player->dynabomb_size;
6046     dynabomb_xl = player->dynabomb_xl;
6047     player->dynabombs_left++;
6048   }
6049
6050   Explode(ex, ey, EX_PHASE_START, EX_TYPE_CENTER);
6051
6052   for (i = 0; i < NUM_DIRECTIONS; i++)
6053   {
6054     for (j = 1; j <= dynabomb_size; j++)
6055     {
6056       int x = ex + j * xy[i][0];
6057       int y = ey + j * xy[i][1];
6058       int element;
6059
6060       if (!IN_LEV_FIELD(x, y) || IS_INDESTRUCTIBLE(Tile[x][y]))
6061         break;
6062
6063       element = Tile[x][y];
6064
6065       // do not restart explosions of fields with active bombs
6066       if (element == EL_EXPLOSION && IS_ACTIVE_BOMB(Store2[x][y]))
6067         continue;
6068
6069       Explode(x, y, EX_PHASE_START, EX_TYPE_BORDER);
6070
6071       if (element != EL_EMPTY && element != EL_EXPLOSION &&
6072           !IS_DIGGABLE(element) && !dynabomb_xl)
6073         break;
6074     }
6075   }
6076 }
6077
6078 void Bang(int x, int y)
6079 {
6080   int element = MovingOrBlocked2Element(x, y);
6081   int explosion_type = EX_TYPE_NORMAL;
6082
6083   if (IS_PLAYER(x, y) && !PLAYER_EXPLOSION_PROTECTED(x, y))
6084   {
6085     struct PlayerInfo *player = PLAYERINFO(x, y);
6086
6087     element = Tile[x][y] = player->initial_element;
6088
6089     if (level.use_explosion_element[player->index_nr])
6090     {
6091       int explosion_element = level.explosion_element[player->index_nr];
6092
6093       if (element_info[explosion_element].explosion_type == EXPLODES_CROSS)
6094         explosion_type = EX_TYPE_CROSS;
6095       else if (element_info[explosion_element].explosion_type == EXPLODES_1X1)
6096         explosion_type = EX_TYPE_CENTER;
6097     }
6098   }
6099
6100   switch (element)
6101   {
6102     case EL_BUG:
6103     case EL_SPACESHIP:
6104     case EL_BD_BUTTERFLY:
6105     case EL_BD_FIREFLY:
6106     case EL_YAMYAM:
6107     case EL_DARK_YAMYAM:
6108     case EL_ROBOT:
6109     case EL_PACMAN:
6110     case EL_MOLE:
6111       RaiseScoreElement(element);
6112       break;
6113
6114     case EL_DYNABOMB_PLAYER_1_ACTIVE:
6115     case EL_DYNABOMB_PLAYER_2_ACTIVE:
6116     case EL_DYNABOMB_PLAYER_3_ACTIVE:
6117     case EL_DYNABOMB_PLAYER_4_ACTIVE:
6118     case EL_DYNABOMB_INCREASE_NUMBER:
6119     case EL_DYNABOMB_INCREASE_SIZE:
6120     case EL_DYNABOMB_INCREASE_POWER:
6121       explosion_type = EX_TYPE_DYNA;
6122       break;
6123
6124     case EL_DC_LANDMINE:
6125       explosion_type = EX_TYPE_CENTER;
6126       break;
6127
6128     case EL_PENGUIN:
6129     case EL_LAMP:
6130     case EL_LAMP_ACTIVE:
6131     case EL_AMOEBA_TO_DIAMOND:
6132       if (!IS_PLAYER(x, y))     // penguin and player may be at same field
6133         explosion_type = EX_TYPE_CENTER;
6134       break;
6135
6136     default:
6137       if (element_info[element].explosion_type == EXPLODES_CROSS)
6138         explosion_type = EX_TYPE_CROSS;
6139       else if (element_info[element].explosion_type == EXPLODES_1X1)
6140         explosion_type = EX_TYPE_CENTER;
6141       break;
6142   }
6143
6144   if (explosion_type == EX_TYPE_DYNA)
6145     DynaExplode(x, y);
6146   else
6147     Explode(x, y, EX_PHASE_START, explosion_type);
6148
6149   CheckTriggeredElementChange(x, y, element, CE_EXPLOSION_OF_X);
6150 }
6151
6152 static void SplashAcid(int x, int y)
6153 {
6154   if (IN_LEV_FIELD(x - 1, y - 1) && IS_FREE(x - 1, y - 1) &&
6155       (!IN_LEV_FIELD(x - 1, y - 2) ||
6156        !CAN_FALL(MovingOrBlocked2Element(x - 1, y - 2))))
6157     Tile[x - 1][y - 1] = EL_ACID_SPLASH_LEFT;
6158
6159   if (IN_LEV_FIELD(x + 1, y - 1) && IS_FREE(x + 1, y - 1) &&
6160       (!IN_LEV_FIELD(x + 1, y - 2) ||
6161        !CAN_FALL(MovingOrBlocked2Element(x + 1, y - 2))))
6162     Tile[x + 1][y - 1] = EL_ACID_SPLASH_RIGHT;
6163
6164   PlayLevelSound(x, y, SND_ACID_SPLASHING);
6165 }
6166
6167 static void InitBeltMovement(void)
6168 {
6169   static int belt_base_element[4] =
6170   {
6171     EL_CONVEYOR_BELT_1_LEFT,
6172     EL_CONVEYOR_BELT_2_LEFT,
6173     EL_CONVEYOR_BELT_3_LEFT,
6174     EL_CONVEYOR_BELT_4_LEFT
6175   };
6176   static int belt_base_active_element[4] =
6177   {
6178     EL_CONVEYOR_BELT_1_LEFT_ACTIVE,
6179     EL_CONVEYOR_BELT_2_LEFT_ACTIVE,
6180     EL_CONVEYOR_BELT_3_LEFT_ACTIVE,
6181     EL_CONVEYOR_BELT_4_LEFT_ACTIVE
6182   };
6183
6184   int x, y, i, j;
6185
6186   // set frame order for belt animation graphic according to belt direction
6187   for (i = 0; i < NUM_BELTS; i++)
6188   {
6189     int belt_nr = i;
6190
6191     for (j = 0; j < NUM_BELT_PARTS; j++)
6192     {
6193       int element = belt_base_active_element[belt_nr] + j;
6194       int graphic_1 = el2img(element);
6195       int graphic_2 = el2panelimg(element);
6196
6197       if (game.belt_dir[i] == MV_LEFT)
6198       {
6199         graphic_info[graphic_1].anim_mode &= ~ANIM_REVERSE;
6200         graphic_info[graphic_2].anim_mode &= ~ANIM_REVERSE;
6201       }
6202       else
6203       {
6204         graphic_info[graphic_1].anim_mode |=  ANIM_REVERSE;
6205         graphic_info[graphic_2].anim_mode |=  ANIM_REVERSE;
6206       }
6207     }
6208   }
6209
6210   SCAN_PLAYFIELD(x, y)
6211   {
6212     int element = Tile[x][y];
6213
6214     for (i = 0; i < NUM_BELTS; i++)
6215     {
6216       if (IS_BELT(element) && game.belt_dir[i] != MV_NONE)
6217       {
6218         int e_belt_nr = getBeltNrFromBeltElement(element);
6219         int belt_nr = i;
6220
6221         if (e_belt_nr == belt_nr)
6222         {
6223           int belt_part = Tile[x][y] - belt_base_element[belt_nr];
6224
6225           Tile[x][y] = belt_base_active_element[belt_nr] + belt_part;
6226         }
6227       }
6228     }
6229   }
6230 }
6231
6232 static void ToggleBeltSwitch(int x, int y)
6233 {
6234   static int belt_base_element[4] =
6235   {
6236     EL_CONVEYOR_BELT_1_LEFT,
6237     EL_CONVEYOR_BELT_2_LEFT,
6238     EL_CONVEYOR_BELT_3_LEFT,
6239     EL_CONVEYOR_BELT_4_LEFT
6240   };
6241   static int belt_base_active_element[4] =
6242   {
6243     EL_CONVEYOR_BELT_1_LEFT_ACTIVE,
6244     EL_CONVEYOR_BELT_2_LEFT_ACTIVE,
6245     EL_CONVEYOR_BELT_3_LEFT_ACTIVE,
6246     EL_CONVEYOR_BELT_4_LEFT_ACTIVE
6247   };
6248   static int belt_base_switch_element[4] =
6249   {
6250     EL_CONVEYOR_BELT_1_SWITCH_LEFT,
6251     EL_CONVEYOR_BELT_2_SWITCH_LEFT,
6252     EL_CONVEYOR_BELT_3_SWITCH_LEFT,
6253     EL_CONVEYOR_BELT_4_SWITCH_LEFT
6254   };
6255   static int belt_move_dir[4] =
6256   {
6257     MV_LEFT,
6258     MV_NONE,
6259     MV_RIGHT,
6260     MV_NONE,
6261   };
6262
6263   int element = Tile[x][y];
6264   int belt_nr = getBeltNrFromBeltSwitchElement(element);
6265   int belt_dir_nr = (game.belt_dir_nr[belt_nr] + 1) % 4;
6266   int belt_dir = belt_move_dir[belt_dir_nr];
6267   int xx, yy, i;
6268
6269   if (!IS_BELT_SWITCH(element))
6270     return;
6271
6272   game.belt_dir_nr[belt_nr] = belt_dir_nr;
6273   game.belt_dir[belt_nr] = belt_dir;
6274
6275   if (belt_dir_nr == 3)
6276     belt_dir_nr = 1;
6277
6278   // set frame order for belt animation graphic according to belt direction
6279   for (i = 0; i < NUM_BELT_PARTS; i++)
6280   {
6281     int element = belt_base_active_element[belt_nr] + i;
6282     int graphic_1 = el2img(element);
6283     int graphic_2 = el2panelimg(element);
6284
6285     if (belt_dir == MV_LEFT)
6286     {
6287       graphic_info[graphic_1].anim_mode &= ~ANIM_REVERSE;
6288       graphic_info[graphic_2].anim_mode &= ~ANIM_REVERSE;
6289     }
6290     else
6291     {
6292       graphic_info[graphic_1].anim_mode |=  ANIM_REVERSE;
6293       graphic_info[graphic_2].anim_mode |=  ANIM_REVERSE;
6294     }
6295   }
6296
6297   SCAN_PLAYFIELD(xx, yy)
6298   {
6299     int element = Tile[xx][yy];
6300
6301     if (IS_BELT_SWITCH(element))
6302     {
6303       int e_belt_nr = getBeltNrFromBeltSwitchElement(element);
6304
6305       if (e_belt_nr == belt_nr)
6306       {
6307         Tile[xx][yy] = belt_base_switch_element[belt_nr] + belt_dir_nr;
6308         TEST_DrawLevelField(xx, yy);
6309       }
6310     }
6311     else if (IS_BELT(element) && belt_dir != MV_NONE)
6312     {
6313       int e_belt_nr = getBeltNrFromBeltElement(element);
6314
6315       if (e_belt_nr == belt_nr)
6316       {
6317         int belt_part = Tile[xx][yy] - belt_base_element[belt_nr];
6318
6319         Tile[xx][yy] = belt_base_active_element[belt_nr] + belt_part;
6320         TEST_DrawLevelField(xx, yy);
6321       }
6322     }
6323     else if (IS_BELT_ACTIVE(element) && belt_dir == MV_NONE)
6324     {
6325       int e_belt_nr = getBeltNrFromBeltActiveElement(element);
6326
6327       if (e_belt_nr == belt_nr)
6328       {
6329         int belt_part = Tile[xx][yy] - belt_base_active_element[belt_nr];
6330
6331         Tile[xx][yy] = belt_base_element[belt_nr] + belt_part;
6332         TEST_DrawLevelField(xx, yy);
6333       }
6334     }
6335   }
6336 }
6337
6338 static void ToggleSwitchgateSwitch(int x, int y)
6339 {
6340   int xx, yy;
6341
6342   game.switchgate_pos = !game.switchgate_pos;
6343
6344   SCAN_PLAYFIELD(xx, yy)
6345   {
6346     int element = Tile[xx][yy];
6347
6348     if (element == EL_SWITCHGATE_SWITCH_UP)
6349     {
6350       Tile[xx][yy] = EL_SWITCHGATE_SWITCH_DOWN;
6351       TEST_DrawLevelField(xx, yy);
6352     }
6353     else if (element == EL_SWITCHGATE_SWITCH_DOWN)
6354     {
6355       Tile[xx][yy] = EL_SWITCHGATE_SWITCH_UP;
6356       TEST_DrawLevelField(xx, yy);
6357     }
6358     else if (element == EL_DC_SWITCHGATE_SWITCH_UP)
6359     {
6360       Tile[xx][yy] = EL_DC_SWITCHGATE_SWITCH_DOWN;
6361       TEST_DrawLevelField(xx, yy);
6362     }
6363     else if (element == EL_DC_SWITCHGATE_SWITCH_DOWN)
6364     {
6365       Tile[xx][yy] = EL_DC_SWITCHGATE_SWITCH_UP;
6366       TEST_DrawLevelField(xx, yy);
6367     }
6368     else if (element == EL_SWITCHGATE_OPEN ||
6369              element == EL_SWITCHGATE_OPENING)
6370     {
6371       Tile[xx][yy] = EL_SWITCHGATE_CLOSING;
6372
6373       PlayLevelSoundAction(xx, yy, ACTION_CLOSING);
6374     }
6375     else if (element == EL_SWITCHGATE_CLOSED ||
6376              element == EL_SWITCHGATE_CLOSING)
6377     {
6378       Tile[xx][yy] = EL_SWITCHGATE_OPENING;
6379
6380       PlayLevelSoundAction(xx, yy, ACTION_OPENING);
6381     }
6382   }
6383 }
6384
6385 static int getInvisibleActiveFromInvisibleElement(int element)
6386 {
6387   return (element == EL_INVISIBLE_STEELWALL ? EL_INVISIBLE_STEELWALL_ACTIVE :
6388           element == EL_INVISIBLE_WALL      ? EL_INVISIBLE_WALL_ACTIVE :
6389           element == EL_INVISIBLE_SAND      ? EL_INVISIBLE_SAND_ACTIVE :
6390           element);
6391 }
6392
6393 static int getInvisibleFromInvisibleActiveElement(int element)
6394 {
6395   return (element == EL_INVISIBLE_STEELWALL_ACTIVE ? EL_INVISIBLE_STEELWALL :
6396           element == EL_INVISIBLE_WALL_ACTIVE      ? EL_INVISIBLE_WALL :
6397           element == EL_INVISIBLE_SAND_ACTIVE      ? EL_INVISIBLE_SAND :
6398           element);
6399 }
6400
6401 static void RedrawAllLightSwitchesAndInvisibleElements(void)
6402 {
6403   int x, y;
6404
6405   SCAN_PLAYFIELD(x, y)
6406   {
6407     int element = Tile[x][y];
6408
6409     if (element == EL_LIGHT_SWITCH &&
6410         game.light_time_left > 0)
6411     {
6412       Tile[x][y] = EL_LIGHT_SWITCH_ACTIVE;
6413       TEST_DrawLevelField(x, y);
6414     }
6415     else if (element == EL_LIGHT_SWITCH_ACTIVE &&
6416              game.light_time_left == 0)
6417     {
6418       Tile[x][y] = EL_LIGHT_SWITCH;
6419       TEST_DrawLevelField(x, y);
6420     }
6421     else if (element == EL_EMC_DRIPPER &&
6422              game.light_time_left > 0)
6423     {
6424       Tile[x][y] = EL_EMC_DRIPPER_ACTIVE;
6425       TEST_DrawLevelField(x, y);
6426     }
6427     else if (element == EL_EMC_DRIPPER_ACTIVE &&
6428              game.light_time_left == 0)
6429     {
6430       Tile[x][y] = EL_EMC_DRIPPER;
6431       TEST_DrawLevelField(x, y);
6432     }
6433     else if (element == EL_INVISIBLE_STEELWALL ||
6434              element == EL_INVISIBLE_WALL ||
6435              element == EL_INVISIBLE_SAND)
6436     {
6437       if (game.light_time_left > 0)
6438         Tile[x][y] = getInvisibleActiveFromInvisibleElement(element);
6439
6440       TEST_DrawLevelField(x, y);
6441
6442       // uncrumble neighbour fields, if needed
6443       if (element == EL_INVISIBLE_SAND)
6444         TEST_DrawLevelFieldCrumbledNeighbours(x, y);
6445     }
6446     else if (element == EL_INVISIBLE_STEELWALL_ACTIVE ||
6447              element == EL_INVISIBLE_WALL_ACTIVE ||
6448              element == EL_INVISIBLE_SAND_ACTIVE)
6449     {
6450       if (game.light_time_left == 0)
6451         Tile[x][y] = getInvisibleFromInvisibleActiveElement(element);
6452
6453       TEST_DrawLevelField(x, y);
6454
6455       // re-crumble neighbour fields, if needed
6456       if (element == EL_INVISIBLE_SAND)
6457         TEST_DrawLevelFieldCrumbledNeighbours(x, y);
6458     }
6459   }
6460 }
6461
6462 static void RedrawAllInvisibleElementsForLenses(void)
6463 {
6464   int x, y;
6465
6466   SCAN_PLAYFIELD(x, y)
6467   {
6468     int element = Tile[x][y];
6469
6470     if (element == EL_EMC_DRIPPER &&
6471         game.lenses_time_left > 0)
6472     {
6473       Tile[x][y] = EL_EMC_DRIPPER_ACTIVE;
6474       TEST_DrawLevelField(x, y);
6475     }
6476     else if (element == EL_EMC_DRIPPER_ACTIVE &&
6477              game.lenses_time_left == 0)
6478     {
6479       Tile[x][y] = EL_EMC_DRIPPER;
6480       TEST_DrawLevelField(x, y);
6481     }
6482     else if (element == EL_INVISIBLE_STEELWALL ||
6483              element == EL_INVISIBLE_WALL ||
6484              element == EL_INVISIBLE_SAND)
6485     {
6486       if (game.lenses_time_left > 0)
6487         Tile[x][y] = getInvisibleActiveFromInvisibleElement(element);
6488
6489       TEST_DrawLevelField(x, y);
6490
6491       // uncrumble neighbour fields, if needed
6492       if (element == EL_INVISIBLE_SAND)
6493         TEST_DrawLevelFieldCrumbledNeighbours(x, y);
6494     }
6495     else if (element == EL_INVISIBLE_STEELWALL_ACTIVE ||
6496              element == EL_INVISIBLE_WALL_ACTIVE ||
6497              element == EL_INVISIBLE_SAND_ACTIVE)
6498     {
6499       if (game.lenses_time_left == 0)
6500         Tile[x][y] = getInvisibleFromInvisibleActiveElement(element);
6501
6502       TEST_DrawLevelField(x, y);
6503
6504       // re-crumble neighbour fields, if needed
6505       if (element == EL_INVISIBLE_SAND)
6506         TEST_DrawLevelFieldCrumbledNeighbours(x, y);
6507     }
6508   }
6509 }
6510
6511 static void RedrawAllInvisibleElementsForMagnifier(void)
6512 {
6513   int x, y;
6514
6515   SCAN_PLAYFIELD(x, y)
6516   {
6517     int element = Tile[x][y];
6518
6519     if (element == EL_EMC_FAKE_GRASS &&
6520         game.magnify_time_left > 0)
6521     {
6522       Tile[x][y] = EL_EMC_FAKE_GRASS_ACTIVE;
6523       TEST_DrawLevelField(x, y);
6524     }
6525     else if (element == EL_EMC_FAKE_GRASS_ACTIVE &&
6526              game.magnify_time_left == 0)
6527     {
6528       Tile[x][y] = EL_EMC_FAKE_GRASS;
6529       TEST_DrawLevelField(x, y);
6530     }
6531     else if (IS_GATE_GRAY(element) &&
6532              game.magnify_time_left > 0)
6533     {
6534       Tile[x][y] = (IS_RND_GATE_GRAY(element) ?
6535                     element - EL_GATE_1_GRAY + EL_GATE_1_GRAY_ACTIVE :
6536                     IS_EM_GATE_GRAY(element) ?
6537                     element - EL_EM_GATE_1_GRAY + EL_EM_GATE_1_GRAY_ACTIVE :
6538                     IS_EMC_GATE_GRAY(element) ?
6539                     element - EL_EMC_GATE_5_GRAY + EL_EMC_GATE_5_GRAY_ACTIVE :
6540                     IS_DC_GATE_GRAY(element) ?
6541                     EL_DC_GATE_WHITE_GRAY_ACTIVE :
6542                     element);
6543       TEST_DrawLevelField(x, y);
6544     }
6545     else if (IS_GATE_GRAY_ACTIVE(element) &&
6546              game.magnify_time_left == 0)
6547     {
6548       Tile[x][y] = (IS_RND_GATE_GRAY_ACTIVE(element) ?
6549                     element - EL_GATE_1_GRAY_ACTIVE + EL_GATE_1_GRAY :
6550                     IS_EM_GATE_GRAY_ACTIVE(element) ?
6551                     element - EL_EM_GATE_1_GRAY_ACTIVE + EL_EM_GATE_1_GRAY :
6552                     IS_EMC_GATE_GRAY_ACTIVE(element) ?
6553                     element - EL_EMC_GATE_5_GRAY_ACTIVE + EL_EMC_GATE_5_GRAY :
6554                     IS_DC_GATE_GRAY_ACTIVE(element) ?
6555                     EL_DC_GATE_WHITE_GRAY :
6556                     element);
6557       TEST_DrawLevelField(x, y);
6558     }
6559   }
6560 }
6561
6562 static void ToggleLightSwitch(int x, int y)
6563 {
6564   int element = Tile[x][y];
6565
6566   game.light_time_left =
6567     (element == EL_LIGHT_SWITCH ?
6568      level.time_light * FRAMES_PER_SECOND : 0);
6569
6570   RedrawAllLightSwitchesAndInvisibleElements();
6571 }
6572
6573 static void ActivateTimegateSwitch(int x, int y)
6574 {
6575   int xx, yy;
6576
6577   game.timegate_time_left = level.time_timegate * FRAMES_PER_SECOND;
6578
6579   SCAN_PLAYFIELD(xx, yy)
6580   {
6581     int element = Tile[xx][yy];
6582
6583     if (element == EL_TIMEGATE_CLOSED ||
6584         element == EL_TIMEGATE_CLOSING)
6585     {
6586       Tile[xx][yy] = EL_TIMEGATE_OPENING;
6587       PlayLevelSound(xx, yy, SND_CLASS_TIMEGATE_OPENING);
6588     }
6589
6590     /*
6591     else if (element == EL_TIMEGATE_SWITCH_ACTIVE)
6592     {
6593       Tile[xx][yy] = EL_TIMEGATE_SWITCH;
6594       TEST_DrawLevelField(xx, yy);
6595     }
6596     */
6597
6598   }
6599
6600   Tile[x][y] = (Tile[x][y] == EL_TIMEGATE_SWITCH ? EL_TIMEGATE_SWITCH_ACTIVE :
6601                 EL_DC_TIMEGATE_SWITCH_ACTIVE);
6602 }
6603
6604 static void Impact(int x, int y)
6605 {
6606   boolean last_line = (y == lev_fieldy - 1);
6607   boolean object_hit = FALSE;
6608   boolean impact = (last_line || object_hit);
6609   int element = Tile[x][y];
6610   int smashed = EL_STEELWALL;
6611
6612   if (!last_line)       // check if element below was hit
6613   {
6614     if (Tile[x][y + 1] == EL_PLAYER_IS_LEAVING)
6615       return;
6616
6617     object_hit = (!IS_FREE(x, y + 1) && (!IS_MOVING(x, y + 1) ||
6618                                          MovDir[x][y + 1] != MV_DOWN ||
6619                                          MovPos[x][y + 1] <= TILEY / 2));
6620
6621     // do not smash moving elements that left the smashed field in time
6622     if (game.engine_version >= VERSION_IDENT(2,2,0,7) && IS_MOVING(x, y + 1) &&
6623         ABS(MovPos[x][y + 1] + getElementMoveStepsize(x, y + 1)) >= TILEX)
6624       object_hit = FALSE;
6625
6626 #if USE_QUICKSAND_IMPACT_BUGFIX
6627     if (Tile[x][y + 1] == EL_QUICKSAND_EMPTYING && object_hit == FALSE)
6628     {
6629       RemoveMovingField(x, y + 1);
6630       Tile[x][y + 1] = EL_QUICKSAND_EMPTY;
6631       Tile[x][y + 2] = EL_ROCK;
6632       TEST_DrawLevelField(x, y + 2);
6633
6634       object_hit = TRUE;
6635     }
6636
6637     if (Tile[x][y + 1] == EL_QUICKSAND_FAST_EMPTYING && object_hit == FALSE)
6638     {
6639       RemoveMovingField(x, y + 1);
6640       Tile[x][y + 1] = EL_QUICKSAND_FAST_EMPTY;
6641       Tile[x][y + 2] = EL_ROCK;
6642       TEST_DrawLevelField(x, y + 2);
6643
6644       object_hit = TRUE;
6645     }
6646 #endif
6647
6648     if (object_hit)
6649       smashed = MovingOrBlocked2Element(x, y + 1);
6650
6651     impact = (last_line || object_hit);
6652   }
6653
6654   if (!last_line && smashed == EL_ACID) // element falls into acid
6655   {
6656     SplashAcid(x, y + 1);
6657     return;
6658   }
6659
6660   // !!! not sufficient for all cases -- see EL_PEARL below !!!
6661   // only reset graphic animation if graphic really changes after impact
6662   if (impact &&
6663       el_act_dir2img(element, GfxAction[x][y], MV_DOWN) != el2img(element))
6664   {
6665     ResetGfxAnimation(x, y);
6666     TEST_DrawLevelField(x, y);
6667   }
6668
6669   if (impact && CAN_EXPLODE_IMPACT(element))
6670   {
6671     Bang(x, y);
6672     return;
6673   }
6674   else if (impact && element == EL_PEARL &&
6675            smashed != EL_DC_MAGIC_WALL && smashed != EL_DC_MAGIC_WALL_ACTIVE)
6676   {
6677     ResetGfxAnimation(x, y);
6678
6679     Tile[x][y] = EL_PEARL_BREAKING;
6680     PlayLevelSound(x, y, SND_PEARL_BREAKING);
6681     return;
6682   }
6683   else if (impact && CheckElementChange(x, y, element, smashed, CE_IMPACT))
6684   {
6685     PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
6686
6687     return;
6688   }
6689
6690   if (impact && element == EL_AMOEBA_DROP)
6691   {
6692     if (object_hit && IS_PLAYER(x, y + 1))
6693       KillPlayerUnlessEnemyProtected(x, y + 1);
6694     else if (object_hit && smashed == EL_PENGUIN)
6695       Bang(x, y + 1);
6696     else
6697     {
6698       Tile[x][y] = EL_AMOEBA_GROWING;
6699       Store[x][y] = EL_AMOEBA_WET;
6700
6701       ResetRandomAnimationValue(x, y);
6702     }
6703     return;
6704   }
6705
6706   if (object_hit)               // check which object was hit
6707   {
6708     if ((CAN_PASS_MAGIC_WALL(element) &&
6709          (smashed == EL_MAGIC_WALL ||
6710           smashed == EL_BD_MAGIC_WALL)) ||
6711         (CAN_PASS_DC_MAGIC_WALL(element) &&
6712          smashed == EL_DC_MAGIC_WALL))
6713     {
6714       int xx, yy;
6715       int activated_magic_wall =
6716         (smashed == EL_MAGIC_WALL ? EL_MAGIC_WALL_ACTIVE :
6717          smashed == EL_BD_MAGIC_WALL ? EL_BD_MAGIC_WALL_ACTIVE :
6718          EL_DC_MAGIC_WALL_ACTIVE);
6719
6720       // activate magic wall / mill
6721       SCAN_PLAYFIELD(xx, yy)
6722       {
6723         if (Tile[xx][yy] == smashed)
6724           Tile[xx][yy] = activated_magic_wall;
6725       }
6726
6727       game.magic_wall_time_left = level.time_magic_wall * FRAMES_PER_SECOND;
6728       game.magic_wall_active = TRUE;
6729
6730       PlayLevelSound(x, y, (smashed == EL_MAGIC_WALL ?
6731                             SND_MAGIC_WALL_ACTIVATING :
6732                             smashed == EL_BD_MAGIC_WALL ?
6733                             SND_BD_MAGIC_WALL_ACTIVATING :
6734                             SND_DC_MAGIC_WALL_ACTIVATING));
6735     }
6736
6737     if (IS_PLAYER(x, y + 1))
6738     {
6739       if (CAN_SMASH_PLAYER(element))
6740       {
6741         KillPlayerUnlessEnemyProtected(x, y + 1);
6742         return;
6743       }
6744     }
6745     else if (smashed == EL_PENGUIN)
6746     {
6747       if (CAN_SMASH_PLAYER(element))
6748       {
6749         Bang(x, y + 1);
6750         return;
6751       }
6752     }
6753     else if (element == EL_BD_DIAMOND)
6754     {
6755       if (IS_CLASSIC_ENEMY(smashed) && IS_BD_ELEMENT(smashed))
6756       {
6757         Bang(x, y + 1);
6758         return;
6759       }
6760     }
6761     else if (((element == EL_SP_INFOTRON ||
6762                element == EL_SP_ZONK) &&
6763               (smashed == EL_SP_SNIKSNAK ||
6764                smashed == EL_SP_ELECTRON ||
6765                smashed == EL_SP_DISK_ORANGE)) ||
6766              (element == EL_SP_INFOTRON &&
6767               smashed == EL_SP_DISK_YELLOW))
6768     {
6769       Bang(x, y + 1);
6770       return;
6771     }
6772     else if (CAN_SMASH_EVERYTHING(element))
6773     {
6774       if (IS_CLASSIC_ENEMY(smashed) ||
6775           CAN_EXPLODE_SMASHED(smashed))
6776       {
6777         Bang(x, y + 1);
6778         return;
6779       }
6780       else if (!IS_MOVING(x, y + 1) && !IS_BLOCKED(x, y + 1))
6781       {
6782         if (smashed == EL_LAMP ||
6783             smashed == EL_LAMP_ACTIVE)
6784         {
6785           Bang(x, y + 1);
6786           return;
6787         }
6788         else if (smashed == EL_NUT)
6789         {
6790           Tile[x][y + 1] = EL_NUT_BREAKING;
6791           PlayLevelSound(x, y, SND_NUT_BREAKING);
6792           RaiseScoreElement(EL_NUT);
6793           return;
6794         }
6795         else if (smashed == EL_PEARL)
6796         {
6797           ResetGfxAnimation(x, y);
6798
6799           Tile[x][y + 1] = EL_PEARL_BREAKING;
6800           PlayLevelSound(x, y, SND_PEARL_BREAKING);
6801           return;
6802         }
6803         else if (smashed == EL_DIAMOND)
6804         {
6805           Tile[x][y + 1] = EL_DIAMOND_BREAKING;
6806           PlayLevelSound(x, y, SND_DIAMOND_BREAKING);
6807           return;
6808         }
6809         else if (IS_BELT_SWITCH(smashed))
6810         {
6811           ToggleBeltSwitch(x, y + 1);
6812         }
6813         else if (smashed == EL_SWITCHGATE_SWITCH_UP ||
6814                  smashed == EL_SWITCHGATE_SWITCH_DOWN ||
6815                  smashed == EL_DC_SWITCHGATE_SWITCH_UP ||
6816                  smashed == EL_DC_SWITCHGATE_SWITCH_DOWN)
6817         {
6818           ToggleSwitchgateSwitch(x, y + 1);
6819         }
6820         else if (smashed == EL_LIGHT_SWITCH ||
6821                  smashed == EL_LIGHT_SWITCH_ACTIVE)
6822         {
6823           ToggleLightSwitch(x, y + 1);
6824         }
6825         else
6826         {
6827           CheckElementChange(x, y + 1, smashed, element, CE_SMASHED);
6828
6829           CheckElementChangeBySide(x, y + 1, smashed, element,
6830                                    CE_SWITCHED, CH_SIDE_TOP);
6831           CheckTriggeredElementChangeBySide(x, y + 1, smashed, CE_SWITCH_OF_X,
6832                                             CH_SIDE_TOP);
6833         }
6834       }
6835       else
6836       {
6837         CheckElementChange(x, y + 1, smashed, element, CE_SMASHED);
6838       }
6839     }
6840   }
6841
6842   // play sound of magic wall / mill
6843   if (!last_line &&
6844       (Tile[x][y + 1] == EL_MAGIC_WALL_ACTIVE ||
6845        Tile[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE ||
6846        Tile[x][y + 1] == EL_DC_MAGIC_WALL_ACTIVE))
6847   {
6848     if (Tile[x][y + 1] == EL_MAGIC_WALL_ACTIVE)
6849       PlayLevelSound(x, y, SND_MAGIC_WALL_FILLING);
6850     else if (Tile[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE)
6851       PlayLevelSound(x, y, SND_BD_MAGIC_WALL_FILLING);
6852     else if (Tile[x][y + 1] == EL_DC_MAGIC_WALL_ACTIVE)
6853       PlayLevelSound(x, y, SND_DC_MAGIC_WALL_FILLING);
6854
6855     return;
6856   }
6857
6858   // play sound of object that hits the ground
6859   if (last_line || object_hit)
6860     PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
6861 }
6862
6863 static void TurnRoundExt(int x, int y)
6864 {
6865   static struct
6866   {
6867     int dx, dy;
6868   } move_xy[] =
6869   {
6870     {  0,  0 },
6871     { -1,  0 },
6872     { +1,  0 },
6873     {  0,  0 },
6874     {  0, -1 },
6875     {  0,  0 }, { 0, 0 }, { 0, 0 },
6876     {  0, +1 }
6877   };
6878   static struct
6879   {
6880     int left, right, back;
6881   } turn[] =
6882   {
6883     { 0,        0,              0        },
6884     { MV_DOWN,  MV_UP,          MV_RIGHT },
6885     { MV_UP,    MV_DOWN,        MV_LEFT  },
6886     { 0,        0,              0        },
6887     { MV_LEFT,  MV_RIGHT,       MV_DOWN  },
6888     { 0,        0,              0        },
6889     { 0,        0,              0        },
6890     { 0,        0,              0        },
6891     { MV_RIGHT, MV_LEFT,        MV_UP    }
6892   };
6893
6894   int element = Tile[x][y];
6895   int move_pattern = element_info[element].move_pattern;
6896
6897   int old_move_dir = MovDir[x][y];
6898   int left_dir  = turn[old_move_dir].left;
6899   int right_dir = turn[old_move_dir].right;
6900   int back_dir  = turn[old_move_dir].back;
6901
6902   int left_dx  = move_xy[left_dir].dx,     left_dy  = move_xy[left_dir].dy;
6903   int right_dx = move_xy[right_dir].dx,    right_dy = move_xy[right_dir].dy;
6904   int move_dx  = move_xy[old_move_dir].dx, move_dy  = move_xy[old_move_dir].dy;
6905   int back_dx  = move_xy[back_dir].dx,     back_dy  = move_xy[back_dir].dy;
6906
6907   int left_x  = x + left_dx,  left_y  = y + left_dy;
6908   int right_x = x + right_dx, right_y = y + right_dy;
6909   int move_x  = x + move_dx,  move_y  = y + move_dy;
6910
6911   int xx, yy;
6912
6913   if (element == EL_BUG || element == EL_BD_BUTTERFLY)
6914   {
6915     TestIfBadThingTouchesOtherBadThing(x, y);
6916
6917     if (ENEMY_CAN_ENTER_FIELD(element, right_x, right_y))
6918       MovDir[x][y] = right_dir;
6919     else if (!ENEMY_CAN_ENTER_FIELD(element, move_x, move_y))
6920       MovDir[x][y] = left_dir;
6921
6922     if (element == EL_BUG && MovDir[x][y] != old_move_dir)
6923       MovDelay[x][y] = 9;
6924     else if (element == EL_BD_BUTTERFLY)     // && MovDir[x][y] == left_dir)
6925       MovDelay[x][y] = 1;
6926   }
6927   else if (element == EL_SPACESHIP || element == EL_BD_FIREFLY)
6928   {
6929     TestIfBadThingTouchesOtherBadThing(x, y);
6930
6931     if (ENEMY_CAN_ENTER_FIELD(element, left_x, left_y))
6932       MovDir[x][y] = left_dir;
6933     else if (!ENEMY_CAN_ENTER_FIELD(element, move_x, move_y))
6934       MovDir[x][y] = right_dir;
6935
6936     if (element == EL_SPACESHIP && MovDir[x][y] != old_move_dir)
6937       MovDelay[x][y] = 9;
6938     else if (element == EL_BD_FIREFLY)      // && MovDir[x][y] == right_dir)
6939       MovDelay[x][y] = 1;
6940   }
6941   else if (element == EL_SP_SNIKSNAK || element == EL_SP_ELECTRON)
6942   {
6943     TestIfBadThingTouchesOtherBadThing(x, y);
6944
6945     if (ELEMENT_CAN_ENTER_FIELD_BASE_4(element, left_x, left_y, 0))
6946       MovDir[x][y] = left_dir;
6947     else if (!ELEMENT_CAN_ENTER_FIELD_BASE_4(element, move_x, move_y, 0))
6948       MovDir[x][y] = right_dir;
6949
6950     if (MovDir[x][y] != old_move_dir)
6951       MovDelay[x][y] = 9;
6952   }
6953   else if (element == EL_YAMYAM)
6954   {
6955     boolean can_turn_left  = YAMYAM_CAN_ENTER_FIELD(element, left_x, left_y);
6956     boolean can_turn_right = YAMYAM_CAN_ENTER_FIELD(element, right_x, right_y);
6957
6958     if (can_turn_left && can_turn_right)
6959       MovDir[x][y] = (RND(3) ? (RND(2) ? left_dir : right_dir) : back_dir);
6960     else if (can_turn_left)
6961       MovDir[x][y] = (RND(2) ? left_dir : back_dir);
6962     else if (can_turn_right)
6963       MovDir[x][y] = (RND(2) ? right_dir : back_dir);
6964     else
6965       MovDir[x][y] = back_dir;
6966
6967     MovDelay[x][y] = 16 + 16 * RND(3);
6968   }
6969   else if (element == EL_DARK_YAMYAM)
6970   {
6971     boolean can_turn_left  = DARK_YAMYAM_CAN_ENTER_FIELD(element,
6972                                                          left_x, left_y);
6973     boolean can_turn_right = DARK_YAMYAM_CAN_ENTER_FIELD(element,
6974                                                          right_x, right_y);
6975
6976     if (can_turn_left && can_turn_right)
6977       MovDir[x][y] = (RND(3) ? (RND(2) ? left_dir : right_dir) : back_dir);
6978     else if (can_turn_left)
6979       MovDir[x][y] = (RND(2) ? left_dir : back_dir);
6980     else if (can_turn_right)
6981       MovDir[x][y] = (RND(2) ? right_dir : back_dir);
6982     else
6983       MovDir[x][y] = back_dir;
6984
6985     MovDelay[x][y] = 16 + 16 * RND(3);
6986   }
6987   else if (element == EL_PACMAN)
6988   {
6989     boolean can_turn_left  = PACMAN_CAN_ENTER_FIELD(element, left_x, left_y);
6990     boolean can_turn_right = PACMAN_CAN_ENTER_FIELD(element, right_x, right_y);
6991
6992     if (can_turn_left && can_turn_right)
6993       MovDir[x][y] = (RND(3) ? (RND(2) ? left_dir : right_dir) : back_dir);
6994     else if (can_turn_left)
6995       MovDir[x][y] = (RND(2) ? left_dir : back_dir);
6996     else if (can_turn_right)
6997       MovDir[x][y] = (RND(2) ? right_dir : back_dir);
6998     else
6999       MovDir[x][y] = back_dir;
7000
7001     MovDelay[x][y] = 6 + RND(40);
7002   }
7003   else if (element == EL_PIG)
7004   {
7005     boolean can_turn_left  = PIG_CAN_ENTER_FIELD(element, left_x, left_y);
7006     boolean can_turn_right = PIG_CAN_ENTER_FIELD(element, right_x, right_y);
7007     boolean can_move_on    = PIG_CAN_ENTER_FIELD(element, move_x, move_y);
7008     boolean should_turn_left, should_turn_right, should_move_on;
7009     int rnd_value = 24;
7010     int rnd = RND(rnd_value);
7011
7012     should_turn_left = (can_turn_left &&
7013                         (!can_move_on ||
7014                          IN_LEV_FIELD_AND_NOT_FREE(x + back_dx + left_dx,
7015                                                    y + back_dy + left_dy)));
7016     should_turn_right = (can_turn_right &&
7017                          (!can_move_on ||
7018                           IN_LEV_FIELD_AND_NOT_FREE(x + back_dx + right_dx,
7019                                                     y + back_dy + right_dy)));
7020     should_move_on = (can_move_on &&
7021                       (!can_turn_left ||
7022                        !can_turn_right ||
7023                        IN_LEV_FIELD_AND_NOT_FREE(x + move_dx + left_dx,
7024                                                  y + move_dy + left_dy) ||
7025                        IN_LEV_FIELD_AND_NOT_FREE(x + move_dx + right_dx,
7026                                                  y + move_dy + right_dy)));
7027
7028     if (should_turn_left || should_turn_right || should_move_on)
7029     {
7030       if (should_turn_left && should_turn_right && should_move_on)
7031         MovDir[x][y] = (rnd < rnd_value / 3     ? left_dir :
7032                         rnd < 2 * rnd_value / 3 ? right_dir :
7033                         old_move_dir);
7034       else if (should_turn_left && should_turn_right)
7035         MovDir[x][y] = (rnd < rnd_value / 2 ? left_dir : right_dir);
7036       else if (should_turn_left && should_move_on)
7037         MovDir[x][y] = (rnd < rnd_value / 2 ? left_dir : old_move_dir);
7038       else if (should_turn_right && should_move_on)
7039         MovDir[x][y] = (rnd < rnd_value / 2 ? right_dir : old_move_dir);
7040       else if (should_turn_left)
7041         MovDir[x][y] = left_dir;
7042       else if (should_turn_right)
7043         MovDir[x][y] = right_dir;
7044       else if (should_move_on)
7045         MovDir[x][y] = old_move_dir;
7046     }
7047     else if (can_move_on && rnd > rnd_value / 8)
7048       MovDir[x][y] = old_move_dir;
7049     else if (can_turn_left && can_turn_right)
7050       MovDir[x][y] = (rnd < rnd_value / 2 ? left_dir : right_dir);
7051     else if (can_turn_left && rnd > rnd_value / 8)
7052       MovDir[x][y] = left_dir;
7053     else if (can_turn_right && rnd > rnd_value/8)
7054       MovDir[x][y] = right_dir;
7055     else
7056       MovDir[x][y] = back_dir;
7057
7058     xx = x + move_xy[MovDir[x][y]].dx;
7059     yy = y + move_xy[MovDir[x][y]].dy;
7060
7061     if (!IN_LEV_FIELD(xx, yy) ||
7062         (!IS_FREE(xx, yy) && !IS_FOOD_PIG(Tile[xx][yy])))
7063       MovDir[x][y] = old_move_dir;
7064
7065     MovDelay[x][y] = 0;
7066   }
7067   else if (element == EL_DRAGON)
7068   {
7069     boolean can_turn_left  = DRAGON_CAN_ENTER_FIELD(element, left_x, left_y);
7070     boolean can_turn_right = DRAGON_CAN_ENTER_FIELD(element, right_x, right_y);
7071     boolean can_move_on    = DRAGON_CAN_ENTER_FIELD(element, move_x, move_y);
7072     int rnd_value = 24;
7073     int rnd = RND(rnd_value);
7074
7075     if (can_move_on && rnd > rnd_value / 8)
7076       MovDir[x][y] = old_move_dir;
7077     else if (can_turn_left && can_turn_right)
7078       MovDir[x][y] = (rnd < rnd_value / 2 ? left_dir : right_dir);
7079     else if (can_turn_left && rnd > rnd_value / 8)
7080       MovDir[x][y] = left_dir;
7081     else if (can_turn_right && rnd > rnd_value / 8)
7082       MovDir[x][y] = right_dir;
7083     else
7084       MovDir[x][y] = back_dir;
7085
7086     xx = x + move_xy[MovDir[x][y]].dx;
7087     yy = y + move_xy[MovDir[x][y]].dy;
7088
7089     if (!IN_LEV_FIELD_AND_IS_FREE(xx, yy))
7090       MovDir[x][y] = old_move_dir;
7091
7092     MovDelay[x][y] = 0;
7093   }
7094   else if (element == EL_MOLE)
7095   {
7096     boolean can_move_on =
7097       (MOLE_CAN_ENTER_FIELD(element, move_x, move_y,
7098                             IS_AMOEBOID(Tile[move_x][move_y]) ||
7099                             Tile[move_x][move_y] == EL_AMOEBA_SHRINKING));
7100     if (!can_move_on)
7101     {
7102       boolean can_turn_left =
7103         (MOLE_CAN_ENTER_FIELD(element, left_x, left_y,
7104                               IS_AMOEBOID(Tile[left_x][left_y])));
7105
7106       boolean can_turn_right =
7107         (MOLE_CAN_ENTER_FIELD(element, right_x, right_y,
7108                               IS_AMOEBOID(Tile[right_x][right_y])));
7109
7110       if (can_turn_left && can_turn_right)
7111         MovDir[x][y] = (RND(2) ? left_dir : right_dir);
7112       else if (can_turn_left)
7113         MovDir[x][y] = left_dir;
7114       else
7115         MovDir[x][y] = right_dir;
7116     }
7117
7118     if (MovDir[x][y] != old_move_dir)
7119       MovDelay[x][y] = 9;
7120   }
7121   else if (element == EL_BALLOON)
7122   {
7123     MovDir[x][y] = game.wind_direction;
7124     MovDelay[x][y] = 0;
7125   }
7126   else if (element == EL_SPRING)
7127   {
7128     if (MovDir[x][y] & MV_HORIZONTAL)
7129     {
7130       if (SPRING_CAN_BUMP_FROM_FIELD(move_x, move_y) &&
7131           !SPRING_CAN_ENTER_FIELD(element, x, y + 1))
7132       {
7133         Tile[move_x][move_y] = EL_EMC_SPRING_BUMPER_ACTIVE;
7134         ResetGfxAnimation(move_x, move_y);
7135         TEST_DrawLevelField(move_x, move_y);
7136
7137         MovDir[x][y] = back_dir;
7138       }
7139       else if (!SPRING_CAN_ENTER_FIELD(element, move_x, move_y) ||
7140                SPRING_CAN_ENTER_FIELD(element, x, y + 1))
7141         MovDir[x][y] = MV_NONE;
7142     }
7143
7144     MovDelay[x][y] = 0;
7145   }
7146   else if (element == EL_ROBOT ||
7147            element == EL_SATELLITE ||
7148            element == EL_PENGUIN ||
7149            element == EL_EMC_ANDROID)
7150   {
7151     int attr_x = -1, attr_y = -1;
7152
7153     if (game.all_players_gone)
7154     {
7155       attr_x = game.exit_x;
7156       attr_y = game.exit_y;
7157     }
7158     else
7159     {
7160       int i;
7161
7162       for (i = 0; i < MAX_PLAYERS; i++)
7163       {
7164         struct PlayerInfo *player = &stored_player[i];
7165         int jx = player->jx, jy = player->jy;
7166
7167         if (!player->active)
7168           continue;
7169
7170         if (attr_x == -1 ||
7171             ABS(jx - x) + ABS(jy - y) < ABS(attr_x - x) + ABS(attr_y - y))
7172         {
7173           attr_x = jx;
7174           attr_y = jy;
7175         }
7176       }
7177     }
7178
7179     if (element == EL_ROBOT &&
7180         game.robot_wheel_x >= 0 &&
7181         game.robot_wheel_y >= 0 &&
7182         (Tile[game.robot_wheel_x][game.robot_wheel_y] == EL_ROBOT_WHEEL_ACTIVE ||
7183          game.engine_version < VERSION_IDENT(3,1,0,0)))
7184     {
7185       attr_x = game.robot_wheel_x;
7186       attr_y = game.robot_wheel_y;
7187     }
7188
7189     if (element == EL_PENGUIN)
7190     {
7191       int i;
7192       static int xy[4][2] =
7193       {
7194         { 0, -1 },
7195         { -1, 0 },
7196         { +1, 0 },
7197         { 0, +1 }
7198       };
7199
7200       for (i = 0; i < NUM_DIRECTIONS; i++)
7201       {
7202         int ex = x + xy[i][0];
7203         int ey = y + xy[i][1];
7204
7205         if (IN_LEV_FIELD(ex, ey) && (Tile[ex][ey] == EL_EXIT_OPEN ||
7206                                      Tile[ex][ey] == EL_EM_EXIT_OPEN ||
7207                                      Tile[ex][ey] == EL_STEEL_EXIT_OPEN ||
7208                                      Tile[ex][ey] == EL_EM_STEEL_EXIT_OPEN))
7209         {
7210           attr_x = ex;
7211           attr_y = ey;
7212           break;
7213         }
7214       }
7215     }
7216
7217     MovDir[x][y] = MV_NONE;
7218     if (attr_x < x)
7219       MovDir[x][y] |= (game.all_players_gone ? MV_RIGHT : MV_LEFT);
7220     else if (attr_x > x)
7221       MovDir[x][y] |= (game.all_players_gone ? MV_LEFT : MV_RIGHT);
7222     if (attr_y < y)
7223       MovDir[x][y] |= (game.all_players_gone ? MV_DOWN : MV_UP);
7224     else if (attr_y > y)
7225       MovDir[x][y] |= (game.all_players_gone ? MV_UP : MV_DOWN);
7226
7227     if (element == EL_ROBOT)
7228     {
7229       int newx, newy;
7230
7231       if (MovDir[x][y] & MV_HORIZONTAL && MovDir[x][y] & MV_VERTICAL)
7232         MovDir[x][y] &= (RND(2) ? MV_HORIZONTAL : MV_VERTICAL);
7233       Moving2Blocked(x, y, &newx, &newy);
7234
7235       if (IN_LEV_FIELD(newx, newy) && IS_FREE_OR_PLAYER(newx, newy))
7236         MovDelay[x][y] = 8 + 8 * !RND(3);
7237       else
7238         MovDelay[x][y] = 16;
7239     }
7240     else if (element == EL_PENGUIN)
7241     {
7242       int newx, newy;
7243
7244       MovDelay[x][y] = 1;
7245
7246       if (MovDir[x][y] & MV_HORIZONTAL && MovDir[x][y] & MV_VERTICAL)
7247       {
7248         boolean first_horiz = RND(2);
7249         int new_move_dir = MovDir[x][y];
7250
7251         MovDir[x][y] =
7252           new_move_dir & (first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
7253         Moving2Blocked(x, y, &newx, &newy);
7254
7255         if (PENGUIN_CAN_ENTER_FIELD(element, newx, newy))
7256           return;
7257
7258         MovDir[x][y] =
7259           new_move_dir & (!first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
7260         Moving2Blocked(x, y, &newx, &newy);
7261
7262         if (PENGUIN_CAN_ENTER_FIELD(element, newx, newy))
7263           return;
7264
7265         MovDir[x][y] = old_move_dir;
7266         return;
7267       }
7268     }
7269     else if (element == EL_SATELLITE)
7270     {
7271       int newx, newy;
7272
7273       MovDelay[x][y] = 1;
7274
7275       if (MovDir[x][y] & MV_HORIZONTAL && MovDir[x][y] & MV_VERTICAL)
7276       {
7277         boolean first_horiz = RND(2);
7278         int new_move_dir = MovDir[x][y];
7279
7280         MovDir[x][y] =
7281           new_move_dir & (first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
7282         Moving2Blocked(x, y, &newx, &newy);
7283
7284         if (SATELLITE_CAN_ENTER_FIELD(newx, newy))
7285           return;
7286
7287         MovDir[x][y] =
7288           new_move_dir & (!first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
7289         Moving2Blocked(x, y, &newx, &newy);
7290
7291         if (SATELLITE_CAN_ENTER_FIELD(newx, newy))
7292           return;
7293
7294         MovDir[x][y] = old_move_dir;
7295         return;
7296       }
7297     }
7298     else if (element == EL_EMC_ANDROID)
7299     {
7300       static int check_pos[16] =
7301       {
7302         -1,             //  0 => (invalid)
7303         7,              //  1 => MV_LEFT
7304         3,              //  2 => MV_RIGHT
7305         -1,             //  3 => (invalid)
7306         1,              //  4 =>            MV_UP
7307         0,              //  5 => MV_LEFT  | MV_UP
7308         2,              //  6 => MV_RIGHT | MV_UP
7309         -1,             //  7 => (invalid)
7310         5,              //  8 =>            MV_DOWN
7311         6,              //  9 => MV_LEFT  | MV_DOWN
7312         4,              // 10 => MV_RIGHT | MV_DOWN
7313         -1,             // 11 => (invalid)
7314         -1,             // 12 => (invalid)
7315         -1,             // 13 => (invalid)
7316         -1,             // 14 => (invalid)
7317         -1,             // 15 => (invalid)
7318       };
7319       static struct
7320       {
7321         int dx, dy;
7322         int dir;
7323       } check_xy[8] =
7324       {
7325         { -1, -1,       MV_LEFT  | MV_UP   },
7326         {  0, -1,                  MV_UP   },
7327         { +1, -1,       MV_RIGHT | MV_UP   },
7328         { +1,  0,       MV_RIGHT           },
7329         { +1, +1,       MV_RIGHT | MV_DOWN },
7330         {  0, +1,                  MV_DOWN },
7331         { -1, +1,       MV_LEFT  | MV_DOWN },
7332         { -1,  0,       MV_LEFT            },
7333       };
7334       int start_pos, check_order;
7335       boolean can_clone = FALSE;
7336       int i;
7337
7338       // check if there is any free field around current position
7339       for (i = 0; i < 8; i++)
7340       {
7341         int newx = x + check_xy[i].dx;
7342         int newy = y + check_xy[i].dy;
7343
7344         if (IN_LEV_FIELD_AND_IS_FREE(newx, newy))
7345         {
7346           can_clone = TRUE;
7347
7348           break;
7349         }
7350       }
7351
7352       if (can_clone)            // randomly find an element to clone
7353       {
7354         can_clone = FALSE;
7355
7356         start_pos = check_pos[RND(8)];
7357         check_order = (RND(2) ? -1 : +1);
7358
7359         for (i = 0; i < 8; i++)
7360         {
7361           int pos_raw = start_pos + i * check_order;
7362           int pos = (pos_raw + 8) % 8;
7363           int newx = x + check_xy[pos].dx;
7364           int newy = y + check_xy[pos].dy;
7365
7366           if (ANDROID_CAN_CLONE_FIELD(newx, newy))
7367           {
7368             element_info[element].move_leave_type = LEAVE_TYPE_LIMITED;
7369             element_info[element].move_leave_element = EL_TRIGGER_ELEMENT;
7370
7371             Store[x][y] = Tile[newx][newy];
7372
7373             can_clone = TRUE;
7374
7375             break;
7376           }
7377         }
7378       }
7379
7380       if (can_clone)            // randomly find a direction to move
7381       {
7382         can_clone = FALSE;
7383
7384         start_pos = check_pos[RND(8)];
7385         check_order = (RND(2) ? -1 : +1);
7386
7387         for (i = 0; i < 8; i++)
7388         {
7389           int pos_raw = start_pos + i * check_order;
7390           int pos = (pos_raw + 8) % 8;
7391           int newx = x + check_xy[pos].dx;
7392           int newy = y + check_xy[pos].dy;
7393           int new_move_dir = check_xy[pos].dir;
7394
7395           if (IN_LEV_FIELD_AND_IS_FREE(newx, newy))
7396           {
7397             MovDir[x][y] = new_move_dir;
7398             MovDelay[x][y] = level.android_clone_time * 8 + 1;
7399
7400             can_clone = TRUE;
7401
7402             break;
7403           }
7404         }
7405       }
7406
7407       if (can_clone)            // cloning and moving successful
7408         return;
7409
7410       // cannot clone -- try to move towards player
7411
7412       start_pos = check_pos[MovDir[x][y] & 0x0f];
7413       check_order = (RND(2) ? -1 : +1);
7414
7415       for (i = 0; i < 3; i++)
7416       {
7417         // first check start_pos, then previous/next or (next/previous) pos
7418         int pos_raw = start_pos + (i < 2 ? i : -1) * check_order;
7419         int pos = (pos_raw + 8) % 8;
7420         int newx = x + check_xy[pos].dx;
7421         int newy = y + check_xy[pos].dy;
7422         int new_move_dir = check_xy[pos].dir;
7423
7424         if (IS_PLAYER(newx, newy))
7425           break;
7426
7427         if (ANDROID_CAN_ENTER_FIELD(element, newx, newy))
7428         {
7429           MovDir[x][y] = new_move_dir;
7430           MovDelay[x][y] = level.android_move_time * 8 + 1;
7431
7432           break;
7433         }
7434       }
7435     }
7436   }
7437   else if (move_pattern == MV_TURNING_LEFT ||
7438            move_pattern == MV_TURNING_RIGHT ||
7439            move_pattern == MV_TURNING_LEFT_RIGHT ||
7440            move_pattern == MV_TURNING_RIGHT_LEFT ||
7441            move_pattern == MV_TURNING_RANDOM ||
7442            move_pattern == MV_ALL_DIRECTIONS)
7443   {
7444     boolean can_turn_left =
7445       CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, left_x, left_y);
7446     boolean can_turn_right =
7447       CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, right_x,right_y);
7448
7449     if (element_info[element].move_stepsize == 0)       // "not moving"
7450       return;
7451
7452     if (move_pattern == MV_TURNING_LEFT)
7453       MovDir[x][y] = left_dir;
7454     else if (move_pattern == MV_TURNING_RIGHT)
7455       MovDir[x][y] = right_dir;
7456     else if (move_pattern == MV_TURNING_LEFT_RIGHT)
7457       MovDir[x][y] = (can_turn_left || !can_turn_right ? left_dir : right_dir);
7458     else if (move_pattern == MV_TURNING_RIGHT_LEFT)
7459       MovDir[x][y] = (can_turn_right || !can_turn_left ? right_dir : left_dir);
7460     else if (move_pattern == MV_TURNING_RANDOM)
7461       MovDir[x][y] = (can_turn_left && !can_turn_right ? left_dir :
7462                       can_turn_right && !can_turn_left ? right_dir :
7463                       RND(2) ? left_dir : right_dir);
7464     else if (can_turn_left && can_turn_right)
7465       MovDir[x][y] = (RND(3) ? (RND(2) ? left_dir : right_dir) : back_dir);
7466     else if (can_turn_left)
7467       MovDir[x][y] = (RND(2) ? left_dir : back_dir);
7468     else if (can_turn_right)
7469       MovDir[x][y] = (RND(2) ? right_dir : back_dir);
7470     else
7471       MovDir[x][y] = back_dir;
7472
7473     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7474   }
7475   else if (move_pattern == MV_HORIZONTAL ||
7476            move_pattern == MV_VERTICAL)
7477   {
7478     if (move_pattern & old_move_dir)
7479       MovDir[x][y] = back_dir;
7480     else if (move_pattern == MV_HORIZONTAL)
7481       MovDir[x][y] = (RND(2) ? MV_LEFT : MV_RIGHT);
7482     else if (move_pattern == MV_VERTICAL)
7483       MovDir[x][y] = (RND(2) ? MV_UP : MV_DOWN);
7484
7485     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7486   }
7487   else if (move_pattern & MV_ANY_DIRECTION)
7488   {
7489     MovDir[x][y] = move_pattern;
7490     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7491   }
7492   else if (move_pattern & MV_WIND_DIRECTION)
7493   {
7494     MovDir[x][y] = game.wind_direction;
7495     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7496   }
7497   else if (move_pattern == MV_ALONG_LEFT_SIDE)
7498   {
7499     if (CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, left_x, left_y))
7500       MovDir[x][y] = left_dir;
7501     else if (!CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, move_x, move_y))
7502       MovDir[x][y] = right_dir;
7503
7504     if (MovDir[x][y] != old_move_dir)
7505       MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7506   }
7507   else if (move_pattern == MV_ALONG_RIGHT_SIDE)
7508   {
7509     if (CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, right_x, right_y))
7510       MovDir[x][y] = right_dir;
7511     else if (!CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, move_x, move_y))
7512       MovDir[x][y] = left_dir;
7513
7514     if (MovDir[x][y] != old_move_dir)
7515       MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7516   }
7517   else if (move_pattern == MV_TOWARDS_PLAYER ||
7518            move_pattern == MV_AWAY_FROM_PLAYER)
7519   {
7520     int attr_x = -1, attr_y = -1;
7521     int newx, newy;
7522     boolean move_away = (move_pattern == MV_AWAY_FROM_PLAYER);
7523
7524     if (game.all_players_gone)
7525     {
7526       attr_x = game.exit_x;
7527       attr_y = game.exit_y;
7528     }
7529     else
7530     {
7531       int i;
7532
7533       for (i = 0; i < MAX_PLAYERS; i++)
7534       {
7535         struct PlayerInfo *player = &stored_player[i];
7536         int jx = player->jx, jy = player->jy;
7537
7538         if (!player->active)
7539           continue;
7540
7541         if (attr_x == -1 ||
7542             ABS(jx - x) + ABS(jy - y) < ABS(attr_x - x) + ABS(attr_y - y))
7543         {
7544           attr_x = jx;
7545           attr_y = jy;
7546         }
7547       }
7548     }
7549
7550     MovDir[x][y] = MV_NONE;
7551     if (attr_x < x)
7552       MovDir[x][y] |= (move_away ? MV_RIGHT : MV_LEFT);
7553     else if (attr_x > x)
7554       MovDir[x][y] |= (move_away ? MV_LEFT : MV_RIGHT);
7555     if (attr_y < y)
7556       MovDir[x][y] |= (move_away ? MV_DOWN : MV_UP);
7557     else if (attr_y > y)
7558       MovDir[x][y] |= (move_away ? MV_UP : MV_DOWN);
7559
7560     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7561
7562     if (MovDir[x][y] & MV_HORIZONTAL && MovDir[x][y] & MV_VERTICAL)
7563     {
7564       boolean first_horiz = RND(2);
7565       int new_move_dir = MovDir[x][y];
7566
7567       if (element_info[element].move_stepsize == 0)     // "not moving"
7568       {
7569         first_horiz = (ABS(attr_x - x) >= ABS(attr_y - y));
7570         MovDir[x][y] &= (first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
7571
7572         return;
7573       }
7574
7575       MovDir[x][y] =
7576         new_move_dir & (first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
7577       Moving2Blocked(x, y, &newx, &newy);
7578
7579       if (CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, newx, newy))
7580         return;
7581
7582       MovDir[x][y] =
7583         new_move_dir & (!first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
7584       Moving2Blocked(x, y, &newx, &newy);
7585
7586       if (CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, newx, newy))
7587         return;
7588
7589       MovDir[x][y] = old_move_dir;
7590     }
7591   }
7592   else if (move_pattern == MV_WHEN_PUSHED ||
7593            move_pattern == MV_WHEN_DROPPED)
7594   {
7595     if (!CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, move_x, move_y))
7596       MovDir[x][y] = MV_NONE;
7597
7598     MovDelay[x][y] = 0;
7599   }
7600   else if (move_pattern & MV_MAZE_RUNNER_STYLE)
7601   {
7602     static int test_xy[7][2] =
7603     {
7604       { 0, -1 },
7605       { -1, 0 },
7606       { +1, 0 },
7607       { 0, +1 },
7608       { 0, -1 },
7609       { -1, 0 },
7610       { +1, 0 },
7611     };
7612     static int test_dir[7] =
7613     {
7614       MV_UP,
7615       MV_LEFT,
7616       MV_RIGHT,
7617       MV_DOWN,
7618       MV_UP,
7619       MV_LEFT,
7620       MV_RIGHT,
7621     };
7622     boolean hunter_mode = (move_pattern == MV_MAZE_HUNTER);
7623     int move_preference = -1000000;     // start with very low preference
7624     int new_move_dir = MV_NONE;
7625     int start_test = RND(4);
7626     int i;
7627
7628     for (i = 0; i < NUM_DIRECTIONS; i++)
7629     {
7630       int move_dir = test_dir[start_test + i];
7631       int move_dir_preference;
7632
7633       xx = x + test_xy[start_test + i][0];
7634       yy = y + test_xy[start_test + i][1];
7635
7636       if (hunter_mode && IN_LEV_FIELD(xx, yy) &&
7637           (IS_PLAYER(xx, yy) || Tile[xx][yy] == EL_PLAYER_IS_LEAVING))
7638       {
7639         new_move_dir = move_dir;
7640
7641         break;
7642       }
7643
7644       if (!CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, xx, yy))
7645         continue;
7646
7647       move_dir_preference = -1 * RunnerVisit[xx][yy];
7648       if (hunter_mode && PlayerVisit[xx][yy] > 0)
7649         move_dir_preference = PlayerVisit[xx][yy];
7650
7651       if (move_dir_preference > move_preference)
7652       {
7653         // prefer field that has not been visited for the longest time
7654         move_preference = move_dir_preference;
7655         new_move_dir = move_dir;
7656       }
7657       else if (move_dir_preference == move_preference &&
7658                move_dir == old_move_dir)
7659       {
7660         // prefer last direction when all directions are preferred equally
7661         move_preference = move_dir_preference;
7662         new_move_dir = move_dir;
7663       }
7664     }
7665
7666     MovDir[x][y] = new_move_dir;
7667     if (old_move_dir != new_move_dir)
7668       MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7669   }
7670 }
7671
7672 static void TurnRound(int x, int y)
7673 {
7674   int direction = MovDir[x][y];
7675
7676   TurnRoundExt(x, y);
7677
7678   GfxDir[x][y] = MovDir[x][y];
7679
7680   if (direction != MovDir[x][y])
7681     GfxFrame[x][y] = 0;
7682
7683   if (MovDelay[x][y])
7684     GfxAction[x][y] = ACTION_TURNING_FROM_LEFT + MV_DIR_TO_BIT(direction);
7685
7686   ResetGfxFrame(x, y);
7687 }
7688
7689 static boolean JustBeingPushed(int x, int y)
7690 {
7691   int i;
7692
7693   for (i = 0; i < MAX_PLAYERS; i++)
7694   {
7695     struct PlayerInfo *player = &stored_player[i];
7696
7697     if (player->active && player->is_pushing && player->MovPos)
7698     {
7699       int next_jx = player->jx + (player->jx - player->last_jx);
7700       int next_jy = player->jy + (player->jy - player->last_jy);
7701
7702       if (x == next_jx && y == next_jy)
7703         return TRUE;
7704     }
7705   }
7706
7707   return FALSE;
7708 }
7709
7710 static void StartMoving(int x, int y)
7711 {
7712   boolean started_moving = FALSE;       // some elements can fall _and_ move
7713   int element = Tile[x][y];
7714
7715   if (Stop[x][y])
7716     return;
7717
7718   if (MovDelay[x][y] == 0)
7719     GfxAction[x][y] = ACTION_DEFAULT;
7720
7721   if (CAN_FALL(element) && y < lev_fieldy - 1)
7722   {
7723     if ((x > 0              && IS_PLAYER(x - 1, y)) ||
7724         (x < lev_fieldx - 1 && IS_PLAYER(x + 1, y)))
7725       if (JustBeingPushed(x, y))
7726         return;
7727
7728     if (element == EL_QUICKSAND_FULL)
7729     {
7730       if (IS_FREE(x, y + 1))
7731       {
7732         InitMovingField(x, y, MV_DOWN);
7733         started_moving = TRUE;
7734
7735         Tile[x][y] = EL_QUICKSAND_EMPTYING;
7736 #if USE_QUICKSAND_BD_ROCK_BUGFIX
7737         if (Store[x][y] != EL_ROCK && Store[x][y] != EL_BD_ROCK)
7738           Store[x][y] = EL_ROCK;
7739 #else
7740         Store[x][y] = EL_ROCK;
7741 #endif
7742
7743         PlayLevelSoundAction(x, y, ACTION_EMPTYING);
7744       }
7745       else if (Tile[x][y + 1] == EL_QUICKSAND_EMPTY)
7746       {
7747         if (!MovDelay[x][y])
7748         {
7749           MovDelay[x][y] = TILEY + 1;
7750
7751           ResetGfxAnimation(x, y);
7752           ResetGfxAnimation(x, y + 1);
7753         }
7754
7755         if (MovDelay[x][y])
7756         {
7757           DrawLevelElement(x, y, EL_QUICKSAND_EMPTYING);
7758           DrawLevelElement(x, y + 1, EL_QUICKSAND_FILLING);
7759
7760           MovDelay[x][y]--;
7761           if (MovDelay[x][y])
7762             return;
7763         }
7764
7765         Tile[x][y] = EL_QUICKSAND_EMPTY;
7766         Tile[x][y + 1] = EL_QUICKSAND_FULL;
7767         Store[x][y + 1] = Store[x][y];
7768         Store[x][y] = 0;
7769
7770         PlayLevelSoundAction(x, y, ACTION_FILLING);
7771       }
7772       else if (Tile[x][y + 1] == EL_QUICKSAND_FAST_EMPTY)
7773       {
7774         if (!MovDelay[x][y])
7775         {
7776           MovDelay[x][y] = TILEY + 1;
7777
7778           ResetGfxAnimation(x, y);
7779           ResetGfxAnimation(x, y + 1);
7780         }
7781
7782         if (MovDelay[x][y])
7783         {
7784           DrawLevelElement(x, y, EL_QUICKSAND_EMPTYING);
7785           DrawLevelElement(x, y + 1, EL_QUICKSAND_FAST_FILLING);
7786
7787           MovDelay[x][y]--;
7788           if (MovDelay[x][y])
7789             return;
7790         }
7791
7792         Tile[x][y] = EL_QUICKSAND_EMPTY;
7793         Tile[x][y + 1] = EL_QUICKSAND_FAST_FULL;
7794         Store[x][y + 1] = Store[x][y];
7795         Store[x][y] = 0;
7796
7797         PlayLevelSoundAction(x, y, ACTION_FILLING);
7798       }
7799     }
7800     else if (element == EL_QUICKSAND_FAST_FULL)
7801     {
7802       if (IS_FREE(x, y + 1))
7803       {
7804         InitMovingField(x, y, MV_DOWN);
7805         started_moving = TRUE;
7806
7807         Tile[x][y] = EL_QUICKSAND_FAST_EMPTYING;
7808 #if USE_QUICKSAND_BD_ROCK_BUGFIX
7809         if (Store[x][y] != EL_ROCK && Store[x][y] != EL_BD_ROCK)
7810           Store[x][y] = EL_ROCK;
7811 #else
7812         Store[x][y] = EL_ROCK;
7813 #endif
7814
7815         PlayLevelSoundAction(x, y, ACTION_EMPTYING);
7816       }
7817       else if (Tile[x][y + 1] == EL_QUICKSAND_FAST_EMPTY)
7818       {
7819         if (!MovDelay[x][y])
7820         {
7821           MovDelay[x][y] = TILEY + 1;
7822
7823           ResetGfxAnimation(x, y);
7824           ResetGfxAnimation(x, y + 1);
7825         }
7826
7827         if (MovDelay[x][y])
7828         {
7829           DrawLevelElement(x, y, EL_QUICKSAND_FAST_EMPTYING);
7830           DrawLevelElement(x, y + 1, EL_QUICKSAND_FAST_FILLING);
7831
7832           MovDelay[x][y]--;
7833           if (MovDelay[x][y])
7834             return;
7835         }
7836
7837         Tile[x][y] = EL_QUICKSAND_FAST_EMPTY;
7838         Tile[x][y + 1] = EL_QUICKSAND_FAST_FULL;
7839         Store[x][y + 1] = Store[x][y];
7840         Store[x][y] = 0;
7841
7842         PlayLevelSoundAction(x, y, ACTION_FILLING);
7843       }
7844       else if (Tile[x][y + 1] == EL_QUICKSAND_EMPTY)
7845       {
7846         if (!MovDelay[x][y])
7847         {
7848           MovDelay[x][y] = TILEY + 1;
7849
7850           ResetGfxAnimation(x, y);
7851           ResetGfxAnimation(x, y + 1);
7852         }
7853
7854         if (MovDelay[x][y])
7855         {
7856           DrawLevelElement(x, y, EL_QUICKSAND_FAST_EMPTYING);
7857           DrawLevelElement(x, y + 1, EL_QUICKSAND_FILLING);
7858
7859           MovDelay[x][y]--;
7860           if (MovDelay[x][y])
7861             return;
7862         }
7863
7864         Tile[x][y] = EL_QUICKSAND_FAST_EMPTY;
7865         Tile[x][y + 1] = EL_QUICKSAND_FULL;
7866         Store[x][y + 1] = Store[x][y];
7867         Store[x][y] = 0;
7868
7869         PlayLevelSoundAction(x, y, ACTION_FILLING);
7870       }
7871     }
7872     else if ((element == EL_ROCK || element == EL_BD_ROCK) &&
7873              Tile[x][y + 1] == EL_QUICKSAND_EMPTY)
7874     {
7875       InitMovingField(x, y, MV_DOWN);
7876       started_moving = TRUE;
7877
7878       Tile[x][y] = EL_QUICKSAND_FILLING;
7879       Store[x][y] = element;
7880
7881       PlayLevelSoundAction(x, y, ACTION_FILLING);
7882     }
7883     else if ((element == EL_ROCK || element == EL_BD_ROCK) &&
7884              Tile[x][y + 1] == EL_QUICKSAND_FAST_EMPTY)
7885     {
7886       InitMovingField(x, y, MV_DOWN);
7887       started_moving = TRUE;
7888
7889       Tile[x][y] = EL_QUICKSAND_FAST_FILLING;
7890       Store[x][y] = element;
7891
7892       PlayLevelSoundAction(x, y, ACTION_FILLING);
7893     }
7894     else if (element == EL_MAGIC_WALL_FULL)
7895     {
7896       if (IS_FREE(x, y + 1))
7897       {
7898         InitMovingField(x, y, MV_DOWN);
7899         started_moving = TRUE;
7900
7901         Tile[x][y] = EL_MAGIC_WALL_EMPTYING;
7902         Store[x][y] = EL_CHANGED(Store[x][y]);
7903       }
7904       else if (Tile[x][y + 1] == EL_MAGIC_WALL_ACTIVE)
7905       {
7906         if (!MovDelay[x][y])
7907           MovDelay[x][y] = TILEY / 4 + 1;
7908
7909         if (MovDelay[x][y])
7910         {
7911           MovDelay[x][y]--;
7912           if (MovDelay[x][y])
7913             return;
7914         }
7915
7916         Tile[x][y] = EL_MAGIC_WALL_ACTIVE;
7917         Tile[x][y + 1] = EL_MAGIC_WALL_FULL;
7918         Store[x][y + 1] = EL_CHANGED(Store[x][y]);
7919         Store[x][y] = 0;
7920       }
7921     }
7922     else if (element == EL_BD_MAGIC_WALL_FULL)
7923     {
7924       if (IS_FREE(x, y + 1))
7925       {
7926         InitMovingField(x, y, MV_DOWN);
7927         started_moving = TRUE;
7928
7929         Tile[x][y] = EL_BD_MAGIC_WALL_EMPTYING;
7930         Store[x][y] = EL_CHANGED_BD(Store[x][y]);
7931       }
7932       else if (Tile[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE)
7933       {
7934         if (!MovDelay[x][y])
7935           MovDelay[x][y] = TILEY / 4 + 1;
7936
7937         if (MovDelay[x][y])
7938         {
7939           MovDelay[x][y]--;
7940           if (MovDelay[x][y])
7941             return;
7942         }
7943
7944         Tile[x][y] = EL_BD_MAGIC_WALL_ACTIVE;
7945         Tile[x][y + 1] = EL_BD_MAGIC_WALL_FULL;
7946         Store[x][y + 1] = EL_CHANGED_BD(Store[x][y]);
7947         Store[x][y] = 0;
7948       }
7949     }
7950     else if (element == EL_DC_MAGIC_WALL_FULL)
7951     {
7952       if (IS_FREE(x, y + 1))
7953       {
7954         InitMovingField(x, y, MV_DOWN);
7955         started_moving = TRUE;
7956
7957         Tile[x][y] = EL_DC_MAGIC_WALL_EMPTYING;
7958         Store[x][y] = EL_CHANGED_DC(Store[x][y]);
7959       }
7960       else if (Tile[x][y + 1] == EL_DC_MAGIC_WALL_ACTIVE)
7961       {
7962         if (!MovDelay[x][y])
7963           MovDelay[x][y] = TILEY / 4 + 1;
7964
7965         if (MovDelay[x][y])
7966         {
7967           MovDelay[x][y]--;
7968           if (MovDelay[x][y])
7969             return;
7970         }
7971
7972         Tile[x][y] = EL_DC_MAGIC_WALL_ACTIVE;
7973         Tile[x][y + 1] = EL_DC_MAGIC_WALL_FULL;
7974         Store[x][y + 1] = EL_CHANGED_DC(Store[x][y]);
7975         Store[x][y] = 0;
7976       }
7977     }
7978     else if ((CAN_PASS_MAGIC_WALL(element) &&
7979               (Tile[x][y + 1] == EL_MAGIC_WALL_ACTIVE ||
7980                Tile[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE)) ||
7981              (CAN_PASS_DC_MAGIC_WALL(element) &&
7982               (Tile[x][y + 1] == EL_DC_MAGIC_WALL_ACTIVE)))
7983
7984     {
7985       InitMovingField(x, y, MV_DOWN);
7986       started_moving = TRUE;
7987
7988       Tile[x][y] =
7989         (Tile[x][y + 1] == EL_MAGIC_WALL_ACTIVE ? EL_MAGIC_WALL_FILLING :
7990          Tile[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE ? EL_BD_MAGIC_WALL_FILLING :
7991          EL_DC_MAGIC_WALL_FILLING);
7992       Store[x][y] = element;
7993     }
7994     else if (CAN_FALL(element) && Tile[x][y + 1] == EL_ACID)
7995     {
7996       SplashAcid(x, y + 1);
7997
7998       InitMovingField(x, y, MV_DOWN);
7999       started_moving = TRUE;
8000
8001       Store[x][y] = EL_ACID;
8002     }
8003     else if (
8004              (game.engine_version >= VERSION_IDENT(3,1,0,0) &&
8005               CheckImpact[x][y] && !IS_FREE(x, y + 1)) ||
8006              (game.engine_version >= VERSION_IDENT(3,0,7,0) &&
8007               CAN_FALL(element) && WasJustFalling[x][y] &&
8008               (Tile[x][y + 1] == EL_BLOCKED || IS_PLAYER(x, y + 1))) ||
8009
8010              (game.engine_version < VERSION_IDENT(2,2,0,7) &&
8011               CAN_FALL(element) && WasJustMoving[x][y] && !Pushed[x][y + 1] &&
8012               (Tile[x][y + 1] == EL_BLOCKED)))
8013     {
8014       /* this is needed for a special case not covered by calling "Impact()"
8015          from "ContinueMoving()": if an element moves to a tile directly below
8016          another element which was just falling on that tile (which was empty
8017          in the previous frame), the falling element above would just stop
8018          instead of smashing the element below (in previous version, the above
8019          element was just checked for "moving" instead of "falling", resulting
8020          in incorrect smashes caused by horizontal movement of the above
8021          element; also, the case of the player being the element to smash was
8022          simply not covered here... :-/ ) */
8023
8024       CheckCollision[x][y] = 0;
8025       CheckImpact[x][y] = 0;
8026
8027       Impact(x, y);
8028     }
8029     else if (IS_FREE(x, y + 1) && element == EL_SPRING && level.use_spring_bug)
8030     {
8031       if (MovDir[x][y] == MV_NONE)
8032       {
8033         InitMovingField(x, y, MV_DOWN);
8034         started_moving = TRUE;
8035       }
8036     }
8037     else if (IS_FREE(x, y + 1) || Tile[x][y + 1] == EL_DIAMOND_BREAKING)
8038     {
8039       if (WasJustFalling[x][y]) // prevent animation from being restarted
8040         MovDir[x][y] = MV_DOWN;
8041
8042       InitMovingField(x, y, MV_DOWN);
8043       started_moving = TRUE;
8044     }
8045     else if (element == EL_AMOEBA_DROP)
8046     {
8047       Tile[x][y] = EL_AMOEBA_GROWING;
8048       Store[x][y] = EL_AMOEBA_WET;
8049     }
8050     else if (((IS_SLIPPERY(Tile[x][y + 1]) && !IS_PLAYER(x, y + 1)) ||
8051               (IS_EM_SLIPPERY_WALL(Tile[x][y + 1]) && IS_GEM(element))) &&
8052              !IS_FALLING(x, y + 1) && !WasJustMoving[x][y + 1] &&
8053              element != EL_DX_SUPABOMB && element != EL_SP_DISK_ORANGE)
8054     {
8055       boolean can_fall_left  = (x > 0 && IS_FREE(x - 1, y) &&
8056                                 (IS_FREE(x - 1, y + 1) ||
8057                                  Tile[x - 1][y + 1] == EL_ACID));
8058       boolean can_fall_right = (x < lev_fieldx - 1 && IS_FREE(x + 1, y) &&
8059                                 (IS_FREE(x + 1, y + 1) ||
8060                                  Tile[x + 1][y + 1] == EL_ACID));
8061       boolean can_fall_any  = (can_fall_left || can_fall_right);
8062       boolean can_fall_both = (can_fall_left && can_fall_right);
8063       int slippery_type = element_info[Tile[x][y + 1]].slippery_type;
8064
8065       if (can_fall_any && slippery_type != SLIPPERY_ANY_RANDOM)
8066       {
8067         if (slippery_type == SLIPPERY_ANY_LEFT_RIGHT && can_fall_both)
8068           can_fall_right = FALSE;
8069         else if (slippery_type == SLIPPERY_ANY_RIGHT_LEFT && can_fall_both)
8070           can_fall_left = FALSE;
8071         else if (slippery_type == SLIPPERY_ONLY_LEFT)
8072           can_fall_right = FALSE;
8073         else if (slippery_type == SLIPPERY_ONLY_RIGHT)
8074           can_fall_left = FALSE;
8075
8076         can_fall_any  = (can_fall_left || can_fall_right);
8077         can_fall_both = FALSE;
8078       }
8079
8080       if (can_fall_both)
8081       {
8082         if (element == EL_BD_ROCK || element == EL_BD_DIAMOND)
8083           can_fall_right = FALSE;       // slip down on left side
8084         else
8085           can_fall_left = !(can_fall_right = RND(2));
8086
8087         can_fall_both = FALSE;
8088       }
8089
8090       if (can_fall_any)
8091       {
8092         // if not determined otherwise, prefer left side for slipping down
8093         InitMovingField(x, y, can_fall_left ? MV_LEFT : MV_RIGHT);
8094         started_moving = TRUE;
8095       }
8096     }
8097     else if (IS_BELT_ACTIVE(Tile[x][y + 1]))
8098     {
8099       boolean left_is_free  = (x > 0 && IS_FREE(x - 1, y));
8100       boolean right_is_free = (x < lev_fieldx - 1 && IS_FREE(x + 1, y));
8101       int belt_nr = getBeltNrFromBeltActiveElement(Tile[x][y + 1]);
8102       int belt_dir = game.belt_dir[belt_nr];
8103
8104       if ((belt_dir == MV_LEFT  && left_is_free) ||
8105           (belt_dir == MV_RIGHT && right_is_free))
8106       {
8107         int nextx = (belt_dir == MV_LEFT ? x - 1 : x + 1);
8108
8109         InitMovingField(x, y, belt_dir);
8110         started_moving = TRUE;
8111
8112         Pushed[x][y] = TRUE;
8113         Pushed[nextx][y] = TRUE;
8114
8115         GfxAction[x][y] = ACTION_DEFAULT;
8116       }
8117       else
8118       {
8119         MovDir[x][y] = 0;       // if element was moving, stop it
8120       }
8121     }
8122   }
8123
8124   // not "else if" because of elements that can fall and move (EL_SPRING)
8125   if (CAN_MOVE(element) && !started_moving)
8126   {
8127     int move_pattern = element_info[element].move_pattern;
8128     int newx, newy;
8129
8130     Moving2Blocked(x, y, &newx, &newy);
8131
8132     if (IS_PUSHABLE(element) && JustBeingPushed(x, y))
8133       return;
8134
8135     if (game.engine_version >= VERSION_IDENT(3,1,0,0) &&
8136         CheckCollision[x][y] && !IN_LEV_FIELD_AND_IS_FREE(newx, newy))
8137     {
8138       WasJustMoving[x][y] = 0;
8139       CheckCollision[x][y] = 0;
8140
8141       TestIfElementHitsCustomElement(x, y, MovDir[x][y]);
8142
8143       if (Tile[x][y] != element)        // element has changed
8144         return;
8145     }
8146
8147     if (!MovDelay[x][y])        // start new movement phase
8148     {
8149       // all objects that can change their move direction after each step
8150       // (YAMYAM, DARK_YAMYAM and PACMAN go straight until they hit a wall
8151
8152       if (element != EL_YAMYAM &&
8153           element != EL_DARK_YAMYAM &&
8154           element != EL_PACMAN &&
8155           !(move_pattern & MV_ANY_DIRECTION) &&
8156           move_pattern != MV_TURNING_LEFT &&
8157           move_pattern != MV_TURNING_RIGHT &&
8158           move_pattern != MV_TURNING_LEFT_RIGHT &&
8159           move_pattern != MV_TURNING_RIGHT_LEFT &&
8160           move_pattern != MV_TURNING_RANDOM)
8161       {
8162         TurnRound(x, y);
8163
8164         if (MovDelay[x][y] && (element == EL_BUG ||
8165                                element == EL_SPACESHIP ||
8166                                element == EL_SP_SNIKSNAK ||
8167                                element == EL_SP_ELECTRON ||
8168                                element == EL_MOLE))
8169           TEST_DrawLevelField(x, y);
8170       }
8171     }
8172
8173     if (MovDelay[x][y])         // wait some time before next movement
8174     {
8175       MovDelay[x][y]--;
8176
8177       if (element == EL_ROBOT ||
8178           element == EL_YAMYAM ||
8179           element == EL_DARK_YAMYAM)
8180       {
8181         DrawLevelElementAnimationIfNeeded(x, y, element);
8182         PlayLevelSoundAction(x, y, ACTION_WAITING);
8183       }
8184       else if (element == EL_SP_ELECTRON)
8185         DrawLevelElementAnimationIfNeeded(x, y, element);
8186       else if (element == EL_DRAGON)
8187       {
8188         int i;
8189         int dir = MovDir[x][y];
8190         int dx = (dir == MV_LEFT ? -1 : dir == MV_RIGHT ? +1 : 0);
8191         int dy = (dir == MV_UP   ? -1 : dir == MV_DOWN  ? +1 : 0);
8192         int graphic = (dir == MV_LEFT   ? IMG_FLAMES_1_LEFT :
8193                        dir == MV_RIGHT  ? IMG_FLAMES_1_RIGHT :
8194                        dir == MV_UP     ? IMG_FLAMES_1_UP :
8195                        dir == MV_DOWN   ? IMG_FLAMES_1_DOWN : IMG_EMPTY);
8196         int frame = getGraphicAnimationFrame(graphic, GfxFrame[x][y]);
8197
8198         GfxAction[x][y] = ACTION_ATTACKING;
8199
8200         if (IS_PLAYER(x, y))
8201           DrawPlayerField(x, y);
8202         else
8203           TEST_DrawLevelField(x, y);
8204
8205         PlayLevelSoundActionIfLoop(x, y, ACTION_ATTACKING);
8206
8207         for (i = 1; i <= 3; i++)
8208         {
8209           int xx = x + i * dx;
8210           int yy = y + i * dy;
8211           int sx = SCREENX(xx);
8212           int sy = SCREENY(yy);
8213           int flame_graphic = graphic + (i - 1);
8214
8215           if (!IN_LEV_FIELD(xx, yy) || IS_DRAGONFIRE_PROOF(Tile[xx][yy]))
8216             break;
8217
8218           if (MovDelay[x][y])
8219           {
8220             int flamed = MovingOrBlocked2Element(xx, yy);
8221
8222             if (IS_CLASSIC_ENEMY(flamed) || CAN_EXPLODE_BY_DRAGONFIRE(flamed))
8223               Bang(xx, yy);
8224             else
8225               RemoveMovingField(xx, yy);
8226
8227             ChangeDelay[xx][yy] = 0;
8228
8229             Tile[xx][yy] = EL_FLAMES;
8230
8231             if (IN_SCR_FIELD(sx, sy))
8232             {
8233               TEST_DrawLevelFieldCrumbled(xx, yy);
8234               DrawGraphic(sx, sy, flame_graphic, frame);
8235             }
8236           }
8237           else
8238           {
8239             if (Tile[xx][yy] == EL_FLAMES)
8240               Tile[xx][yy] = EL_EMPTY;
8241             TEST_DrawLevelField(xx, yy);
8242           }
8243         }
8244       }
8245
8246       if (MovDelay[x][y])       // element still has to wait some time
8247       {
8248         PlayLevelSoundAction(x, y, ACTION_WAITING);
8249
8250         return;
8251       }
8252     }
8253
8254     // now make next step
8255
8256     Moving2Blocked(x, y, &newx, &newy); // get next screen position
8257
8258     if (DONT_COLLIDE_WITH(element) &&
8259         IN_LEV_FIELD(newx, newy) && IS_PLAYER(newx, newy) &&
8260         !PLAYER_ENEMY_PROTECTED(newx, newy))
8261     {
8262       TestIfBadThingRunsIntoPlayer(x, y, MovDir[x][y]);
8263
8264       return;
8265     }
8266
8267     else if (CAN_MOVE_INTO_ACID(element) &&
8268              IN_LEV_FIELD(newx, newy) && Tile[newx][newy] == EL_ACID &&
8269              !IS_MV_DIAGONAL(MovDir[x][y]) &&
8270              (MovDir[x][y] == MV_DOWN ||
8271               game.engine_version >= VERSION_IDENT(3,1,0,0)))
8272     {
8273       SplashAcid(newx, newy);
8274       Store[x][y] = EL_ACID;
8275     }
8276     else if (element == EL_PENGUIN && IN_LEV_FIELD(newx, newy))
8277     {
8278       if (Tile[newx][newy] == EL_EXIT_OPEN ||
8279           Tile[newx][newy] == EL_EM_EXIT_OPEN ||
8280           Tile[newx][newy] == EL_STEEL_EXIT_OPEN ||
8281           Tile[newx][newy] == EL_EM_STEEL_EXIT_OPEN)
8282       {
8283         RemoveField(x, y);
8284         TEST_DrawLevelField(x, y);
8285
8286         PlayLevelSound(newx, newy, SND_PENGUIN_PASSING);
8287         if (IN_SCR_FIELD(SCREENX(newx), SCREENY(newy)))
8288           DrawGraphicThruMask(SCREENX(newx),SCREENY(newy), el2img(element), 0);
8289
8290         game.friends_still_needed--;
8291         if (!game.friends_still_needed &&
8292             !game.GameOver &&
8293             game.all_players_gone)
8294           LevelSolved();
8295
8296         return;
8297       }
8298       else if (IS_FOOD_PENGUIN(Tile[newx][newy]))
8299       {
8300         if (DigField(local_player, x, y, newx, newy, 0,0, DF_DIG) == MP_MOVING)
8301           TEST_DrawLevelField(newx, newy);
8302         else
8303           GfxDir[x][y] = MovDir[x][y] = MV_NONE;
8304       }
8305       else if (!IS_FREE(newx, newy))
8306       {
8307         GfxAction[x][y] = ACTION_WAITING;
8308
8309         if (IS_PLAYER(x, y))
8310           DrawPlayerField(x, y);
8311         else
8312           TEST_DrawLevelField(x, y);
8313
8314         return;
8315       }
8316     }
8317     else if (element == EL_PIG && IN_LEV_FIELD(newx, newy))
8318     {
8319       if (IS_FOOD_PIG(Tile[newx][newy]))
8320       {
8321         if (IS_MOVING(newx, newy))
8322           RemoveMovingField(newx, newy);
8323         else
8324         {
8325           Tile[newx][newy] = EL_EMPTY;
8326           TEST_DrawLevelField(newx, newy);
8327         }
8328
8329         PlayLevelSound(x, y, SND_PIG_DIGGING);
8330       }
8331       else if (!IS_FREE(newx, newy))
8332       {
8333         if (IS_PLAYER(x, y))
8334           DrawPlayerField(x, y);
8335         else
8336           TEST_DrawLevelField(x, y);
8337
8338         return;
8339       }
8340     }
8341     else if (element == EL_EMC_ANDROID && IN_LEV_FIELD(newx, newy))
8342     {
8343       if (Store[x][y] != EL_EMPTY)
8344       {
8345         boolean can_clone = FALSE;
8346         int xx, yy;
8347
8348         // check if element to clone is still there
8349         for (yy = y - 1; yy <= y + 1; yy++) for (xx = x - 1; xx <= x + 1; xx++)
8350         {
8351           if (IN_LEV_FIELD(xx, yy) && Tile[xx][yy] == Store[x][y])
8352           {
8353             can_clone = TRUE;
8354
8355             break;
8356           }
8357         }
8358
8359         // cannot clone or target field not free anymore -- do not clone
8360         if (!can_clone || !ANDROID_CAN_ENTER_FIELD(element, newx, newy))
8361           Store[x][y] = EL_EMPTY;
8362       }
8363
8364       if (ANDROID_CAN_ENTER_FIELD(element, newx, newy))
8365       {
8366         if (IS_MV_DIAGONAL(MovDir[x][y]))
8367         {
8368           int diagonal_move_dir = MovDir[x][y];
8369           int stored = Store[x][y];
8370           int change_delay = 8;
8371           int graphic;
8372
8373           // android is moving diagonally
8374
8375           CreateField(x, y, EL_DIAGONAL_SHRINKING);
8376
8377           Store[x][y] = (stored == EL_ACID ? EL_EMPTY : stored);
8378           GfxElement[x][y] = EL_EMC_ANDROID;
8379           GfxAction[x][y] = ACTION_SHRINKING;
8380           GfxDir[x][y] = diagonal_move_dir;
8381           ChangeDelay[x][y] = change_delay;
8382
8383           graphic = el_act_dir2img(GfxElement[x][y], GfxAction[x][y],
8384                                    GfxDir[x][y]);
8385
8386           DrawLevelGraphicAnimation(x, y, graphic);
8387           PlayLevelSoundAction(x, y, ACTION_SHRINKING);
8388
8389           if (Tile[newx][newy] == EL_ACID)
8390           {
8391             SplashAcid(newx, newy);
8392
8393             return;
8394           }
8395
8396           CreateField(newx, newy, EL_DIAGONAL_GROWING);
8397
8398           Store[newx][newy] = EL_EMC_ANDROID;
8399           GfxElement[newx][newy] = EL_EMC_ANDROID;
8400           GfxAction[newx][newy] = ACTION_GROWING;
8401           GfxDir[newx][newy] = diagonal_move_dir;
8402           ChangeDelay[newx][newy] = change_delay;
8403
8404           graphic = el_act_dir2img(GfxElement[newx][newy],
8405                                    GfxAction[newx][newy], GfxDir[newx][newy]);
8406
8407           DrawLevelGraphicAnimation(newx, newy, graphic);
8408           PlayLevelSoundAction(newx, newy, ACTION_GROWING);
8409
8410           return;
8411         }
8412         else
8413         {
8414           Tile[newx][newy] = EL_EMPTY;
8415           TEST_DrawLevelField(newx, newy);
8416
8417           PlayLevelSoundAction(x, y, ACTION_DIGGING);
8418         }
8419       }
8420       else if (!IS_FREE(newx, newy))
8421       {
8422         return;
8423       }
8424     }
8425     else if (IS_CUSTOM_ELEMENT(element) &&
8426              CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, newx, newy))
8427     {
8428       if (!DigFieldByCE(newx, newy, element))
8429         return;
8430
8431       if (move_pattern & MV_MAZE_RUNNER_STYLE)
8432       {
8433         RunnerVisit[x][y] = FrameCounter;
8434         PlayerVisit[x][y] /= 8;         // expire player visit path
8435       }
8436     }
8437     else if (element == EL_DRAGON && IN_LEV_FIELD(newx, newy))
8438     {
8439       if (!IS_FREE(newx, newy))
8440       {
8441         if (IS_PLAYER(x, y))
8442           DrawPlayerField(x, y);
8443         else
8444           TEST_DrawLevelField(x, y);
8445
8446         return;
8447       }
8448       else
8449       {
8450         boolean wanna_flame = !RND(10);
8451         int dx = newx - x, dy = newy - y;
8452         int newx1 = newx + 1 * dx, newy1 = newy + 1 * dy;
8453         int newx2 = newx + 2 * dx, newy2 = newy + 2 * dy;
8454         int element1 = (IN_LEV_FIELD(newx1, newy1) ?
8455                         MovingOrBlocked2Element(newx1, newy1) : EL_STEELWALL);
8456         int element2 = (IN_LEV_FIELD(newx2, newy2) ?
8457                         MovingOrBlocked2Element(newx2, newy2) : EL_STEELWALL);
8458
8459         if ((wanna_flame ||
8460              IS_CLASSIC_ENEMY(element1) ||
8461              IS_CLASSIC_ENEMY(element2)) &&
8462             element1 != EL_DRAGON && element2 != EL_DRAGON &&
8463             element1 != EL_FLAMES && element2 != EL_FLAMES)
8464         {
8465           ResetGfxAnimation(x, y);
8466           GfxAction[x][y] = ACTION_ATTACKING;
8467
8468           if (IS_PLAYER(x, y))
8469             DrawPlayerField(x, y);
8470           else
8471             TEST_DrawLevelField(x, y);
8472
8473           PlayLevelSound(x, y, SND_DRAGON_ATTACKING);
8474
8475           MovDelay[x][y] = 50;
8476
8477           Tile[newx][newy] = EL_FLAMES;
8478           if (IN_LEV_FIELD(newx1, newy1) && Tile[newx1][newy1] == EL_EMPTY)
8479             Tile[newx1][newy1] = EL_FLAMES;
8480           if (IN_LEV_FIELD(newx2, newy2) && Tile[newx2][newy2] == EL_EMPTY)
8481             Tile[newx2][newy2] = EL_FLAMES;
8482
8483           return;
8484         }
8485       }
8486     }
8487     else if (element == EL_YAMYAM && IN_LEV_FIELD(newx, newy) &&
8488              Tile[newx][newy] == EL_DIAMOND)
8489     {
8490       if (IS_MOVING(newx, newy))
8491         RemoveMovingField(newx, newy);
8492       else
8493       {
8494         Tile[newx][newy] = EL_EMPTY;
8495         TEST_DrawLevelField(newx, newy);
8496       }
8497
8498       PlayLevelSound(x, y, SND_YAMYAM_DIGGING);
8499     }
8500     else if (element == EL_DARK_YAMYAM && IN_LEV_FIELD(newx, newy) &&
8501              IS_FOOD_DARK_YAMYAM(Tile[newx][newy]))
8502     {
8503       if (AmoebaNr[newx][newy])
8504       {
8505         AmoebaCnt2[AmoebaNr[newx][newy]]--;
8506         if (Tile[newx][newy] == EL_AMOEBA_FULL ||
8507             Tile[newx][newy] == EL_BD_AMOEBA)
8508           AmoebaCnt[AmoebaNr[newx][newy]]--;
8509       }
8510
8511       if (IS_MOVING(newx, newy))
8512       {
8513         RemoveMovingField(newx, newy);
8514       }
8515       else
8516       {
8517         Tile[newx][newy] = EL_EMPTY;
8518         TEST_DrawLevelField(newx, newy);
8519       }
8520
8521       PlayLevelSound(x, y, SND_DARK_YAMYAM_DIGGING);
8522     }
8523     else if ((element == EL_PACMAN || element == EL_MOLE)
8524              && IN_LEV_FIELD(newx, newy) && IS_AMOEBOID(Tile[newx][newy]))
8525     {
8526       if (AmoebaNr[newx][newy])
8527       {
8528         AmoebaCnt2[AmoebaNr[newx][newy]]--;
8529         if (Tile[newx][newy] == EL_AMOEBA_FULL ||
8530             Tile[newx][newy] == EL_BD_AMOEBA)
8531           AmoebaCnt[AmoebaNr[newx][newy]]--;
8532       }
8533
8534       if (element == EL_MOLE)
8535       {
8536         Tile[newx][newy] = EL_AMOEBA_SHRINKING;
8537         PlayLevelSound(x, y, SND_MOLE_DIGGING);
8538
8539         ResetGfxAnimation(x, y);
8540         GfxAction[x][y] = ACTION_DIGGING;
8541         TEST_DrawLevelField(x, y);
8542
8543         MovDelay[newx][newy] = 0;       // start amoeba shrinking delay
8544
8545         return;                         // wait for shrinking amoeba
8546       }
8547       else      // element == EL_PACMAN
8548       {
8549         Tile[newx][newy] = EL_EMPTY;
8550         TEST_DrawLevelField(newx, newy);
8551         PlayLevelSound(x, y, SND_PACMAN_DIGGING);
8552       }
8553     }
8554     else if (element == EL_MOLE && IN_LEV_FIELD(newx, newy) &&
8555              (Tile[newx][newy] == EL_AMOEBA_SHRINKING ||
8556               (Tile[newx][newy] == EL_EMPTY && Stop[newx][newy])))
8557     {
8558       // wait for shrinking amoeba to completely disappear
8559       return;
8560     }
8561     else if (!IN_LEV_FIELD(newx, newy) || !IS_FREE(newx, newy))
8562     {
8563       // object was running against a wall
8564
8565       TurnRound(x, y);
8566
8567       if (GFX_ELEMENT(element) != EL_SAND)     // !!! FIX THIS (crumble) !!!
8568         DrawLevelElementAnimation(x, y, element);
8569
8570       if (DONT_TOUCH(element))
8571         TestIfBadThingTouchesPlayer(x, y);
8572
8573       return;
8574     }
8575
8576     InitMovingField(x, y, MovDir[x][y]);
8577
8578     PlayLevelSoundAction(x, y, ACTION_MOVING);
8579   }
8580
8581   if (MovDir[x][y])
8582     ContinueMoving(x, y);
8583 }
8584
8585 void ContinueMoving(int x, int y)
8586 {
8587   int element = Tile[x][y];
8588   struct ElementInfo *ei = &element_info[element];
8589   int direction = MovDir[x][y];
8590   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
8591   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
8592   int newx = x + dx, newy = y + dy;
8593   int stored = Store[x][y];
8594   int stored_new = Store[newx][newy];
8595   boolean pushed_by_player   = (Pushed[x][y] && IS_PLAYER(x, y));
8596   boolean pushed_by_conveyor = (Pushed[x][y] && !IS_PLAYER(x, y));
8597   boolean last_line = (newy == lev_fieldy - 1);
8598   boolean use_step_delay = (GET_MAX_STEP_DELAY(element) != 0);
8599
8600   if (pushed_by_player)         // special case: moving object pushed by player
8601   {
8602     MovPos[x][y] = SIGN(MovPos[x][y]) * (TILEX - ABS(PLAYERINFO(x,y)->MovPos));
8603   }
8604   else if (use_step_delay)      // special case: moving object has step delay
8605   {
8606     if (!MovDelay[x][y])
8607       MovPos[x][y] += getElementMoveStepsize(x, y);
8608
8609     if (MovDelay[x][y])
8610       MovDelay[x][y]--;
8611     else
8612       MovDelay[x][y] = GET_NEW_STEP_DELAY(element);
8613
8614     if (MovDelay[x][y])
8615     {
8616       TEST_DrawLevelField(x, y);
8617
8618       return;   // element is still waiting
8619     }
8620   }
8621   else                          // normal case: generically moving object
8622   {
8623     MovPos[x][y] += getElementMoveStepsize(x, y);
8624   }
8625
8626   if (ABS(MovPos[x][y]) < TILEX)
8627   {
8628     TEST_DrawLevelField(x, y);
8629
8630     return;     // element is still moving
8631   }
8632
8633   // element reached destination field
8634
8635   Tile[x][y] = EL_EMPTY;
8636   Tile[newx][newy] = element;
8637   MovPos[x][y] = 0;     // force "not moving" for "crumbled sand"
8638
8639   if (Store[x][y] == EL_ACID)   // element is moving into acid pool
8640   {
8641     element = Tile[newx][newy] = EL_ACID;
8642   }
8643   else if (element == EL_MOLE)
8644   {
8645     Tile[x][y] = EL_SAND;
8646
8647     TEST_DrawLevelFieldCrumbledNeighbours(x, y);
8648   }
8649   else if (element == EL_QUICKSAND_FILLING)
8650   {
8651     element = Tile[newx][newy] = get_next_element(element);
8652     Store[newx][newy] = Store[x][y];
8653   }
8654   else if (element == EL_QUICKSAND_EMPTYING)
8655   {
8656     Tile[x][y] = get_next_element(element);
8657     element = Tile[newx][newy] = Store[x][y];
8658   }
8659   else if (element == EL_QUICKSAND_FAST_FILLING)
8660   {
8661     element = Tile[newx][newy] = get_next_element(element);
8662     Store[newx][newy] = Store[x][y];
8663   }
8664   else if (element == EL_QUICKSAND_FAST_EMPTYING)
8665   {
8666     Tile[x][y] = get_next_element(element);
8667     element = Tile[newx][newy] = Store[x][y];
8668   }
8669   else if (element == EL_MAGIC_WALL_FILLING)
8670   {
8671     element = Tile[newx][newy] = get_next_element(element);
8672     if (!game.magic_wall_active)
8673       element = Tile[newx][newy] = EL_MAGIC_WALL_DEAD;
8674     Store[newx][newy] = Store[x][y];
8675   }
8676   else if (element == EL_MAGIC_WALL_EMPTYING)
8677   {
8678     Tile[x][y] = get_next_element(element);
8679     if (!game.magic_wall_active)
8680       Tile[x][y] = EL_MAGIC_WALL_DEAD;
8681     element = Tile[newx][newy] = Store[x][y];
8682
8683     InitField(newx, newy, FALSE);
8684   }
8685   else if (element == EL_BD_MAGIC_WALL_FILLING)
8686   {
8687     element = Tile[newx][newy] = get_next_element(element);
8688     if (!game.magic_wall_active)
8689       element = Tile[newx][newy] = EL_BD_MAGIC_WALL_DEAD;
8690     Store[newx][newy] = Store[x][y];
8691   }
8692   else if (element == EL_BD_MAGIC_WALL_EMPTYING)
8693   {
8694     Tile[x][y] = get_next_element(element);
8695     if (!game.magic_wall_active)
8696       Tile[x][y] = EL_BD_MAGIC_WALL_DEAD;
8697     element = Tile[newx][newy] = Store[x][y];
8698
8699     InitField(newx, newy, FALSE);
8700   }
8701   else if (element == EL_DC_MAGIC_WALL_FILLING)
8702   {
8703     element = Tile[newx][newy] = get_next_element(element);
8704     if (!game.magic_wall_active)
8705       element = Tile[newx][newy] = EL_DC_MAGIC_WALL_DEAD;
8706     Store[newx][newy] = Store[x][y];
8707   }
8708   else if (element == EL_DC_MAGIC_WALL_EMPTYING)
8709   {
8710     Tile[x][y] = get_next_element(element);
8711     if (!game.magic_wall_active)
8712       Tile[x][y] = EL_DC_MAGIC_WALL_DEAD;
8713     element = Tile[newx][newy] = Store[x][y];
8714
8715     InitField(newx, newy, FALSE);
8716   }
8717   else if (element == EL_AMOEBA_DROPPING)
8718   {
8719     Tile[x][y] = get_next_element(element);
8720     element = Tile[newx][newy] = Store[x][y];
8721   }
8722   else if (element == EL_SOKOBAN_OBJECT)
8723   {
8724     if (Back[x][y])
8725       Tile[x][y] = Back[x][y];
8726
8727     if (Back[newx][newy])
8728       Tile[newx][newy] = EL_SOKOBAN_FIELD_FULL;
8729
8730     Back[x][y] = Back[newx][newy] = 0;
8731   }
8732
8733   Store[x][y] = EL_EMPTY;
8734   MovPos[x][y] = 0;
8735   MovDir[x][y] = 0;
8736   MovDelay[x][y] = 0;
8737
8738   MovDelay[newx][newy] = 0;
8739
8740   if (CAN_CHANGE_OR_HAS_ACTION(element))
8741   {
8742     // copy element change control values to new field
8743     ChangeDelay[newx][newy] = ChangeDelay[x][y];
8744     ChangePage[newx][newy]  = ChangePage[x][y];
8745     ChangeCount[newx][newy] = ChangeCount[x][y];
8746     ChangeEvent[newx][newy] = ChangeEvent[x][y];
8747   }
8748
8749   CustomValue[newx][newy] = CustomValue[x][y];
8750
8751   ChangeDelay[x][y] = 0;
8752   ChangePage[x][y] = -1;
8753   ChangeCount[x][y] = 0;
8754   ChangeEvent[x][y] = -1;
8755
8756   CustomValue[x][y] = 0;
8757
8758   // copy animation control values to new field
8759   GfxFrame[newx][newy]  = GfxFrame[x][y];
8760   GfxRandom[newx][newy] = GfxRandom[x][y];      // keep same random value
8761   GfxAction[newx][newy] = GfxAction[x][y];      // keep action one frame
8762   GfxDir[newx][newy]    = GfxDir[x][y];         // keep element direction
8763
8764   Pushed[x][y] = Pushed[newx][newy] = FALSE;
8765
8766   // some elements can leave other elements behind after moving
8767   if (ei->move_leave_element != EL_EMPTY &&
8768       (ei->move_leave_type == LEAVE_TYPE_UNLIMITED || stored != EL_EMPTY) &&
8769       (!IS_PLAYER(x, y) || IS_WALKABLE(ei->move_leave_element)))
8770   {
8771     int move_leave_element = ei->move_leave_element;
8772
8773     // this makes it possible to leave the removed element again
8774     if (ei->move_leave_element == EL_TRIGGER_ELEMENT)
8775       move_leave_element = (stored == EL_ACID ? EL_EMPTY : stored);
8776
8777     Tile[x][y] = move_leave_element;
8778
8779     if (element_info[Tile[x][y]].move_direction_initial == MV_START_PREVIOUS)
8780       MovDir[x][y] = direction;
8781
8782     InitField(x, y, FALSE);
8783
8784     if (GFX_CRUMBLED(Tile[x][y]))
8785       TEST_DrawLevelFieldCrumbledNeighbours(x, y);
8786
8787     if (ELEM_IS_PLAYER(move_leave_element))
8788       RelocatePlayer(x, y, move_leave_element);
8789   }
8790
8791   // do this after checking for left-behind element
8792   ResetGfxAnimation(x, y);      // reset animation values for old field
8793
8794   if (!CAN_MOVE(element) ||
8795       (CAN_FALL(element) && direction == MV_DOWN &&
8796        (element == EL_SPRING ||
8797         element_info[element].move_pattern == MV_WHEN_PUSHED ||
8798         element_info[element].move_pattern == MV_WHEN_DROPPED)))
8799     GfxDir[x][y] = MovDir[newx][newy] = 0;
8800
8801   TEST_DrawLevelField(x, y);
8802   TEST_DrawLevelField(newx, newy);
8803
8804   Stop[newx][newy] = TRUE;      // ignore this element until the next frame
8805
8806   // prevent pushed element from moving on in pushed direction
8807   if (pushed_by_player && CAN_MOVE(element) &&
8808       element_info[element].move_pattern & MV_ANY_DIRECTION &&
8809       !(element_info[element].move_pattern & direction))
8810     TurnRound(newx, newy);
8811
8812   // prevent elements on conveyor belt from moving on in last direction
8813   if (pushed_by_conveyor && CAN_FALL(element) &&
8814       direction & MV_HORIZONTAL)
8815     MovDir[newx][newy] = 0;
8816
8817   if (!pushed_by_player)
8818   {
8819     int nextx = newx + dx, nexty = newy + dy;
8820     boolean check_collision_again = IN_LEV_FIELD_AND_IS_FREE(nextx, nexty);
8821
8822     WasJustMoving[newx][newy] = CHECK_DELAY_MOVING;
8823
8824     if (CAN_FALL(element) && direction == MV_DOWN)
8825       WasJustFalling[newx][newy] = CHECK_DELAY_FALLING;
8826
8827     if ((!CAN_FALL(element) || direction == MV_DOWN) && check_collision_again)
8828       CheckCollision[newx][newy] = CHECK_DELAY_COLLISION;
8829
8830     if (CAN_FALL(element) && direction == MV_DOWN && check_collision_again)
8831       CheckImpact[newx][newy] = CHECK_DELAY_IMPACT;
8832   }
8833
8834   if (DONT_TOUCH(element))      // object may be nasty to player or others
8835   {
8836     TestIfBadThingTouchesPlayer(newx, newy);
8837     TestIfBadThingTouchesFriend(newx, newy);
8838
8839     if (!IS_CUSTOM_ELEMENT(element))
8840       TestIfBadThingTouchesOtherBadThing(newx, newy);
8841   }
8842   else if (element == EL_PENGUIN)
8843     TestIfFriendTouchesBadThing(newx, newy);
8844
8845   if (DONT_GET_HIT_BY(element))
8846   {
8847     TestIfGoodThingGetsHitByBadThing(newx, newy, direction);
8848   }
8849
8850   // give the player one last chance (one more frame) to move away
8851   if (CAN_FALL(element) && direction == MV_DOWN &&
8852       (last_line || (!IS_FREE(x, newy + 1) &&
8853                      (!IS_PLAYER(x, newy + 1) ||
8854                       game.engine_version < VERSION_IDENT(3,1,1,0)))))
8855     Impact(x, newy);
8856
8857   if (pushed_by_player && !game.use_change_when_pushing_bug)
8858   {
8859     int push_side = MV_DIR_OPPOSITE(direction);
8860     struct PlayerInfo *player = PLAYERINFO(x, y);
8861
8862     CheckElementChangeByPlayer(newx, newy, element, CE_PUSHED_BY_PLAYER,
8863                                player->index_bit, push_side);
8864     CheckTriggeredElementChangeByPlayer(newx,newy, element, CE_PLAYER_PUSHES_X,
8865                                         player->index_bit, push_side);
8866   }
8867
8868   if (element == EL_EMC_ANDROID && pushed_by_player)    // make another move
8869     MovDelay[newx][newy] = 1;
8870
8871   CheckTriggeredElementChangeBySide(x, y, element, CE_MOVE_OF_X, direction);
8872
8873   TestIfElementTouchesCustomElement(x, y);      // empty or new element
8874   TestIfElementHitsCustomElement(newx, newy, direction);
8875   TestIfPlayerTouchesCustomElement(newx, newy);
8876   TestIfElementTouchesCustomElement(newx, newy);
8877
8878   if (IS_CUSTOM_ELEMENT(element) && ei->move_enter_element != EL_EMPTY &&
8879       IS_EQUAL_OR_IN_GROUP(stored_new, ei->move_enter_element))
8880     CheckElementChangeBySide(newx, newy, element, stored_new, CE_DIGGING_X,
8881                              MV_DIR_OPPOSITE(direction));
8882 }
8883
8884 int AmoebaNeighbourNr(int ax, int ay)
8885 {
8886   int i;
8887   int element = Tile[ax][ay];
8888   int group_nr = 0;
8889   static int xy[4][2] =
8890   {
8891     { 0, -1 },
8892     { -1, 0 },
8893     { +1, 0 },
8894     { 0, +1 }
8895   };
8896
8897   for (i = 0; i < NUM_DIRECTIONS; i++)
8898   {
8899     int x = ax + xy[i][0];
8900     int y = ay + xy[i][1];
8901
8902     if (!IN_LEV_FIELD(x, y))
8903       continue;
8904
8905     if (Tile[x][y] == element && AmoebaNr[x][y] > 0)
8906       group_nr = AmoebaNr[x][y];
8907   }
8908
8909   return group_nr;
8910 }
8911
8912 static void AmoebaMerge(int ax, int ay)
8913 {
8914   int i, x, y, xx, yy;
8915   int new_group_nr = AmoebaNr[ax][ay];
8916   static int xy[4][2] =
8917   {
8918     { 0, -1 },
8919     { -1, 0 },
8920     { +1, 0 },
8921     { 0, +1 }
8922   };
8923
8924   if (new_group_nr == 0)
8925     return;
8926
8927   for (i = 0; i < NUM_DIRECTIONS; i++)
8928   {
8929     x = ax + xy[i][0];
8930     y = ay + xy[i][1];
8931
8932     if (!IN_LEV_FIELD(x, y))
8933       continue;
8934
8935     if ((Tile[x][y] == EL_AMOEBA_FULL ||
8936          Tile[x][y] == EL_BD_AMOEBA ||
8937          Tile[x][y] == EL_AMOEBA_DEAD) &&
8938         AmoebaNr[x][y] != new_group_nr)
8939     {
8940       int old_group_nr = AmoebaNr[x][y];
8941
8942       if (old_group_nr == 0)
8943         return;
8944
8945       AmoebaCnt[new_group_nr] += AmoebaCnt[old_group_nr];
8946       AmoebaCnt[old_group_nr] = 0;
8947       AmoebaCnt2[new_group_nr] += AmoebaCnt2[old_group_nr];
8948       AmoebaCnt2[old_group_nr] = 0;
8949
8950       SCAN_PLAYFIELD(xx, yy)
8951       {
8952         if (AmoebaNr[xx][yy] == old_group_nr)
8953           AmoebaNr[xx][yy] = new_group_nr;
8954       }
8955     }
8956   }
8957 }
8958
8959 void AmoebaToDiamond(int ax, int ay)
8960 {
8961   int i, x, y;
8962
8963   if (Tile[ax][ay] == EL_AMOEBA_DEAD)
8964   {
8965     int group_nr = AmoebaNr[ax][ay];
8966
8967 #ifdef DEBUG
8968     if (group_nr == 0)
8969     {
8970       Debug("game:playing:AmoebaToDiamond", "ax = %d, ay = %d", ax, ay);
8971       Debug("game:playing:AmoebaToDiamond", "This should never happen!");
8972
8973       return;
8974     }
8975 #endif
8976
8977     SCAN_PLAYFIELD(x, y)
8978     {
8979       if (Tile[x][y] == EL_AMOEBA_DEAD && AmoebaNr[x][y] == group_nr)
8980       {
8981         AmoebaNr[x][y] = 0;
8982         Tile[x][y] = EL_AMOEBA_TO_DIAMOND;
8983       }
8984     }
8985
8986     PlayLevelSound(ax, ay, (IS_GEM(level.amoeba_content) ?
8987                             SND_AMOEBA_TURNING_TO_GEM :
8988                             SND_AMOEBA_TURNING_TO_ROCK));
8989     Bang(ax, ay);
8990   }
8991   else
8992   {
8993     static int xy[4][2] =
8994     {
8995       { 0, -1 },
8996       { -1, 0 },
8997       { +1, 0 },
8998       { 0, +1 }
8999     };
9000
9001     for (i = 0; i < NUM_DIRECTIONS; i++)
9002     {
9003       x = ax + xy[i][0];
9004       y = ay + xy[i][1];
9005
9006       if (!IN_LEV_FIELD(x, y))
9007         continue;
9008
9009       if (Tile[x][y] == EL_AMOEBA_TO_DIAMOND)
9010       {
9011         PlayLevelSound(x, y, (IS_GEM(level.amoeba_content) ?
9012                               SND_AMOEBA_TURNING_TO_GEM :
9013                               SND_AMOEBA_TURNING_TO_ROCK));
9014         Bang(x, y);
9015       }
9016     }
9017   }
9018 }
9019
9020 static void AmoebaToDiamondBD(int ax, int ay, int new_element)
9021 {
9022   int x, y;
9023   int group_nr = AmoebaNr[ax][ay];
9024   boolean done = FALSE;
9025
9026 #ifdef DEBUG
9027   if (group_nr == 0)
9028   {
9029     Debug("game:playing:AmoebaToDiamondBD", "ax = %d, ay = %d", ax, ay);
9030     Debug("game:playing:AmoebaToDiamondBD", "This should never happen!");
9031
9032     return;
9033   }
9034 #endif
9035
9036   SCAN_PLAYFIELD(x, y)
9037   {
9038     if (AmoebaNr[x][y] == group_nr &&
9039         (Tile[x][y] == EL_AMOEBA_DEAD ||
9040          Tile[x][y] == EL_BD_AMOEBA ||
9041          Tile[x][y] == EL_AMOEBA_GROWING))
9042     {
9043       AmoebaNr[x][y] = 0;
9044       Tile[x][y] = new_element;
9045       InitField(x, y, FALSE);
9046       TEST_DrawLevelField(x, y);
9047       done = TRUE;
9048     }
9049   }
9050
9051   if (done)
9052     PlayLevelSound(ax, ay, (new_element == EL_BD_ROCK ?
9053                             SND_BD_AMOEBA_TURNING_TO_ROCK :
9054                             SND_BD_AMOEBA_TURNING_TO_GEM));
9055 }
9056
9057 static void AmoebaGrowing(int x, int y)
9058 {
9059   static unsigned int sound_delay = 0;
9060   static unsigned int sound_delay_value = 0;
9061
9062   if (!MovDelay[x][y])          // start new growing cycle
9063   {
9064     MovDelay[x][y] = 7;
9065
9066     if (DelayReached(&sound_delay, sound_delay_value))
9067     {
9068       PlayLevelSoundElementAction(x, y, Store[x][y], ACTION_GROWING);
9069       sound_delay_value = 30;
9070     }
9071   }
9072
9073   if (MovDelay[x][y])           // wait some time before growing bigger
9074   {
9075     MovDelay[x][y]--;
9076     if (MovDelay[x][y]/2 && IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
9077     {
9078       int frame = getGraphicAnimationFrame(IMG_AMOEBA_GROWING,
9079                                            6 - MovDelay[x][y]);
9080
9081       DrawGraphic(SCREENX(x), SCREENY(y), IMG_AMOEBA_GROWING, frame);
9082     }
9083
9084     if (!MovDelay[x][y])
9085     {
9086       Tile[x][y] = Store[x][y];
9087       Store[x][y] = 0;
9088       TEST_DrawLevelField(x, y);
9089     }
9090   }
9091 }
9092
9093 static void AmoebaShrinking(int x, int y)
9094 {
9095   static unsigned int sound_delay = 0;
9096   static unsigned int sound_delay_value = 0;
9097
9098   if (!MovDelay[x][y])          // start new shrinking cycle
9099   {
9100     MovDelay[x][y] = 7;
9101
9102     if (DelayReached(&sound_delay, sound_delay_value))
9103       sound_delay_value = 30;
9104   }
9105
9106   if (MovDelay[x][y])           // wait some time before shrinking
9107   {
9108     MovDelay[x][y]--;
9109     if (MovDelay[x][y]/2 && IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
9110     {
9111       int frame = getGraphicAnimationFrame(IMG_AMOEBA_SHRINKING,
9112                                            6 - MovDelay[x][y]);
9113
9114       DrawGraphic(SCREENX(x), SCREENY(y), IMG_AMOEBA_SHRINKING, frame);
9115     }
9116
9117     if (!MovDelay[x][y])
9118     {
9119       Tile[x][y] = EL_EMPTY;
9120       TEST_DrawLevelField(x, y);
9121
9122       // don't let mole enter this field in this cycle;
9123       // (give priority to objects falling to this field from above)
9124       Stop[x][y] = TRUE;
9125     }
9126   }
9127 }
9128
9129 static void AmoebaReproduce(int ax, int ay)
9130 {
9131   int i;
9132   int element = Tile[ax][ay];
9133   int graphic = el2img(element);
9134   int newax = ax, neway = ay;
9135   boolean can_drop = (element == EL_AMOEBA_WET || element == EL_EMC_DRIPPER);
9136   static int xy[4][2] =
9137   {
9138     { 0, -1 },
9139     { -1, 0 },
9140     { +1, 0 },
9141     { 0, +1 }
9142   };
9143
9144   if (!level.amoeba_speed && element != EL_EMC_DRIPPER)
9145   {
9146     Tile[ax][ay] = EL_AMOEBA_DEAD;
9147     TEST_DrawLevelField(ax, ay);
9148     return;
9149   }
9150
9151   if (IS_ANIMATED(graphic))
9152     DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
9153
9154   if (!MovDelay[ax][ay])        // start making new amoeba field
9155     MovDelay[ax][ay] = RND(FRAMES_PER_SECOND * 25 / (1 + level.amoeba_speed));
9156
9157   if (MovDelay[ax][ay])         // wait some time before making new amoeba
9158   {
9159     MovDelay[ax][ay]--;
9160     if (MovDelay[ax][ay])
9161       return;
9162   }
9163
9164   if (can_drop)                 // EL_AMOEBA_WET or EL_EMC_DRIPPER
9165   {
9166     int start = RND(4);
9167     int x = ax + xy[start][0];
9168     int y = ay + xy[start][1];
9169
9170     if (!IN_LEV_FIELD(x, y))
9171       return;
9172
9173     if (IS_FREE(x, y) ||
9174         CAN_GROW_INTO(Tile[x][y]) ||
9175         Tile[x][y] == EL_QUICKSAND_EMPTY ||
9176         Tile[x][y] == EL_QUICKSAND_FAST_EMPTY)
9177     {
9178       newax = x;
9179       neway = y;
9180     }
9181
9182     if (newax == ax && neway == ay)
9183       return;
9184   }
9185   else                          // normal or "filled" (BD style) amoeba
9186   {
9187     int start = RND(4);
9188     boolean waiting_for_player = FALSE;
9189
9190     for (i = 0; i < NUM_DIRECTIONS; i++)
9191     {
9192       int j = (start + i) % 4;
9193       int x = ax + xy[j][0];
9194       int y = ay + xy[j][1];
9195
9196       if (!IN_LEV_FIELD(x, y))
9197         continue;
9198
9199       if (IS_FREE(x, y) ||
9200           CAN_GROW_INTO(Tile[x][y]) ||
9201           Tile[x][y] == EL_QUICKSAND_EMPTY ||
9202           Tile[x][y] == EL_QUICKSAND_FAST_EMPTY)
9203       {
9204         newax = x;
9205         neway = y;
9206         break;
9207       }
9208       else if (IS_PLAYER(x, y))
9209         waiting_for_player = TRUE;
9210     }
9211
9212     if (newax == ax && neway == ay)             // amoeba cannot grow
9213     {
9214       if (i == 4 && (!waiting_for_player || element == EL_BD_AMOEBA))
9215       {
9216         Tile[ax][ay] = EL_AMOEBA_DEAD;
9217         TEST_DrawLevelField(ax, ay);
9218         AmoebaCnt[AmoebaNr[ax][ay]]--;
9219
9220         if (AmoebaCnt[AmoebaNr[ax][ay]] <= 0)   // amoeba is completely dead
9221         {
9222           if (element == EL_AMOEBA_FULL)
9223             AmoebaToDiamond(ax, ay);
9224           else if (element == EL_BD_AMOEBA)
9225             AmoebaToDiamondBD(ax, ay, level.amoeba_content);
9226         }
9227       }
9228       return;
9229     }
9230     else if (element == EL_AMOEBA_FULL || element == EL_BD_AMOEBA)
9231     {
9232       // amoeba gets larger by growing in some direction
9233
9234       int new_group_nr = AmoebaNr[ax][ay];
9235
9236 #ifdef DEBUG
9237   if (new_group_nr == 0)
9238   {
9239     Debug("game:playing:AmoebaReproduce", "newax = %d, neway = %d",
9240           newax, neway);
9241     Debug("game:playing:AmoebaReproduce", "This should never happen!");
9242
9243     return;
9244   }
9245 #endif
9246
9247       AmoebaNr[newax][neway] = new_group_nr;
9248       AmoebaCnt[new_group_nr]++;
9249       AmoebaCnt2[new_group_nr]++;
9250
9251       // if amoeba touches other amoeba(s) after growing, unify them
9252       AmoebaMerge(newax, neway);
9253
9254       if (element == EL_BD_AMOEBA && AmoebaCnt2[new_group_nr] >= 200)
9255       {
9256         AmoebaToDiamondBD(newax, neway, EL_BD_ROCK);
9257         return;
9258       }
9259     }
9260   }
9261
9262   if (!can_drop || neway < ay || !IS_FREE(newax, neway) ||
9263       (neway == lev_fieldy - 1 && newax != ax))
9264   {
9265     Tile[newax][neway] = EL_AMOEBA_GROWING;     // creation of new amoeba
9266     Store[newax][neway] = element;
9267   }
9268   else if (neway == ay || element == EL_EMC_DRIPPER)
9269   {
9270     Tile[newax][neway] = EL_AMOEBA_DROP;        // drop left/right of amoeba
9271
9272     PlayLevelSoundAction(newax, neway, ACTION_GROWING);
9273   }
9274   else
9275   {
9276     InitMovingField(ax, ay, MV_DOWN);           // drop dripping from amoeba
9277     Tile[ax][ay] = EL_AMOEBA_DROPPING;
9278     Store[ax][ay] = EL_AMOEBA_DROP;
9279     ContinueMoving(ax, ay);
9280     return;
9281   }
9282
9283   TEST_DrawLevelField(newax, neway);
9284 }
9285
9286 static void Life(int ax, int ay)
9287 {
9288   int x1, y1, x2, y2;
9289   int life_time = 40;
9290   int element = Tile[ax][ay];
9291   int graphic = el2img(element);
9292   int *life_parameter = (element == EL_GAME_OF_LIFE ? level.game_of_life :
9293                          level.biomaze);
9294   boolean changed = FALSE;
9295
9296   if (IS_ANIMATED(graphic))
9297     DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
9298
9299   if (Stop[ax][ay])
9300     return;
9301
9302   if (!MovDelay[ax][ay])        // start new "game of life" cycle
9303     MovDelay[ax][ay] = life_time;
9304
9305   if (MovDelay[ax][ay])         // wait some time before next cycle
9306   {
9307     MovDelay[ax][ay]--;
9308     if (MovDelay[ax][ay])
9309       return;
9310   }
9311
9312   for (y1 = -1; y1 < 2; y1++) for (x1 = -1; x1 < 2; x1++)
9313   {
9314     int xx = ax+x1, yy = ay+y1;
9315     int old_element = Tile[xx][yy];
9316     int num_neighbours = 0;
9317
9318     if (!IN_LEV_FIELD(xx, yy))
9319       continue;
9320
9321     for (y2 = -1; y2 < 2; y2++) for (x2 = -1; x2 < 2; x2++)
9322     {
9323       int x = xx+x2, y = yy+y2;
9324
9325       if (!IN_LEV_FIELD(x, y) || (x == xx && y == yy))
9326         continue;
9327
9328       boolean is_player_cell = (element == EL_GAME_OF_LIFE && IS_PLAYER(x, y));
9329       boolean is_neighbour = FALSE;
9330
9331       if (level.use_life_bugs)
9332         is_neighbour =
9333           (((Tile[x][y] == element || is_player_cell) && !Stop[x][y]) ||
9334            (IS_FREE(x, y)                             &&  Stop[x][y]));
9335       else
9336         is_neighbour =
9337           (Last[x][y] == element || is_player_cell);
9338
9339       if (is_neighbour)
9340         num_neighbours++;
9341     }
9342
9343     boolean is_free = FALSE;
9344
9345     if (level.use_life_bugs)
9346       is_free = (IS_FREE(xx, yy));
9347     else
9348       is_free = (IS_FREE(xx, yy) && Last[xx][yy] == EL_EMPTY);
9349
9350     if (xx == ax && yy == ay)           // field in the middle
9351     {
9352       if (num_neighbours < life_parameter[0] ||
9353           num_neighbours > life_parameter[1])
9354       {
9355         Tile[xx][yy] = EL_EMPTY;
9356         if (Tile[xx][yy] != old_element)
9357           TEST_DrawLevelField(xx, yy);
9358         Stop[xx][yy] = TRUE;
9359         changed = TRUE;
9360       }
9361     }
9362     else if (is_free || CAN_GROW_INTO(Tile[xx][yy]))
9363     {                                   // free border field
9364       if (num_neighbours >= life_parameter[2] &&
9365           num_neighbours <= life_parameter[3])
9366       {
9367         Tile[xx][yy] = element;
9368         MovDelay[xx][yy] = (element == EL_GAME_OF_LIFE ? 0 : life_time-1);
9369         if (Tile[xx][yy] != old_element)
9370           TEST_DrawLevelField(xx, yy);
9371         Stop[xx][yy] = TRUE;
9372         changed = TRUE;
9373       }
9374     }
9375   }
9376
9377   if (changed)
9378     PlayLevelSound(ax, ay, element == EL_BIOMAZE ? SND_BIOMAZE_GROWING :
9379                    SND_GAME_OF_LIFE_GROWING);
9380 }
9381
9382 static void InitRobotWheel(int x, int y)
9383 {
9384   ChangeDelay[x][y] = level.time_wheel * FRAMES_PER_SECOND;
9385 }
9386
9387 static void RunRobotWheel(int x, int y)
9388 {
9389   PlayLevelSound(x, y, SND_ROBOT_WHEEL_ACTIVE);
9390 }
9391
9392 static void StopRobotWheel(int x, int y)
9393 {
9394   if (game.robot_wheel_x == x &&
9395       game.robot_wheel_y == y)
9396   {
9397     game.robot_wheel_x = -1;
9398     game.robot_wheel_y = -1;
9399     game.robot_wheel_active = FALSE;
9400   }
9401 }
9402
9403 static void InitTimegateWheel(int x, int y)
9404 {
9405   ChangeDelay[x][y] = level.time_timegate * FRAMES_PER_SECOND;
9406 }
9407
9408 static void RunTimegateWheel(int x, int y)
9409 {
9410   PlayLevelSound(x, y, SND_CLASS_TIMEGATE_SWITCH_ACTIVE);
9411 }
9412
9413 static void InitMagicBallDelay(int x, int y)
9414 {
9415   ChangeDelay[x][y] = (level.ball_time + 1) * 8 + 1;
9416 }
9417
9418 static void ActivateMagicBall(int bx, int by)
9419 {
9420   int x, y;
9421
9422   if (level.ball_random)
9423   {
9424     int pos_border = RND(8);    // select one of the eight border elements
9425     int pos_content = (pos_border > 3 ? pos_border + 1 : pos_border);
9426     int xx = pos_content % 3;
9427     int yy = pos_content / 3;
9428
9429     x = bx - 1 + xx;
9430     y = by - 1 + yy;
9431
9432     if (IN_LEV_FIELD(x, y) && Tile[x][y] == EL_EMPTY)
9433       CreateField(x, y, level.ball_content[game.ball_content_nr].e[xx][yy]);
9434   }
9435   else
9436   {
9437     for (y = by - 1; y <= by + 1; y++) for (x = bx - 1; x <= bx + 1; x++)
9438     {
9439       int xx = x - bx + 1;
9440       int yy = y - by + 1;
9441
9442       if (IN_LEV_FIELD(x, y) && Tile[x][y] == EL_EMPTY)
9443         CreateField(x, y, level.ball_content[game.ball_content_nr].e[xx][yy]);
9444     }
9445   }
9446
9447   game.ball_content_nr = (game.ball_content_nr + 1) % level.num_ball_contents;
9448 }
9449
9450 static void CheckExit(int x, int y)
9451 {
9452   if (game.gems_still_needed > 0 ||
9453       game.sokoban_fields_still_needed > 0 ||
9454       game.sokoban_objects_still_needed > 0 ||
9455       game.lights_still_needed > 0)
9456   {
9457     int element = Tile[x][y];
9458     int graphic = el2img(element);
9459
9460     if (IS_ANIMATED(graphic))
9461       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
9462
9463     return;
9464   }
9465
9466   // do not re-open exit door closed after last player
9467   if (game.all_players_gone)
9468     return;
9469
9470   Tile[x][y] = EL_EXIT_OPENING;
9471
9472   PlayLevelSoundNearest(x, y, SND_CLASS_EXIT_OPENING);
9473 }
9474
9475 static void CheckExitEM(int x, int y)
9476 {
9477   if (game.gems_still_needed > 0 ||
9478       game.sokoban_fields_still_needed > 0 ||
9479       game.sokoban_objects_still_needed > 0 ||
9480       game.lights_still_needed > 0)
9481   {
9482     int element = Tile[x][y];
9483     int graphic = el2img(element);
9484
9485     if (IS_ANIMATED(graphic))
9486       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
9487
9488     return;
9489   }
9490
9491   // do not re-open exit door closed after last player
9492   if (game.all_players_gone)
9493     return;
9494
9495   Tile[x][y] = EL_EM_EXIT_OPENING;
9496
9497   PlayLevelSoundNearest(x, y, SND_CLASS_EM_EXIT_OPENING);
9498 }
9499
9500 static void CheckExitSteel(int x, int y)
9501 {
9502   if (game.gems_still_needed > 0 ||
9503       game.sokoban_fields_still_needed > 0 ||
9504       game.sokoban_objects_still_needed > 0 ||
9505       game.lights_still_needed > 0)
9506   {
9507     int element = Tile[x][y];
9508     int graphic = el2img(element);
9509
9510     if (IS_ANIMATED(graphic))
9511       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
9512
9513     return;
9514   }
9515
9516   // do not re-open exit door closed after last player
9517   if (game.all_players_gone)
9518     return;
9519
9520   Tile[x][y] = EL_STEEL_EXIT_OPENING;
9521
9522   PlayLevelSoundNearest(x, y, SND_CLASS_STEEL_EXIT_OPENING);
9523 }
9524
9525 static void CheckExitSteelEM(int x, int y)
9526 {
9527   if (game.gems_still_needed > 0 ||
9528       game.sokoban_fields_still_needed > 0 ||
9529       game.sokoban_objects_still_needed > 0 ||
9530       game.lights_still_needed > 0)
9531   {
9532     int element = Tile[x][y];
9533     int graphic = el2img(element);
9534
9535     if (IS_ANIMATED(graphic))
9536       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
9537
9538     return;
9539   }
9540
9541   // do not re-open exit door closed after last player
9542   if (game.all_players_gone)
9543     return;
9544
9545   Tile[x][y] = EL_EM_STEEL_EXIT_OPENING;
9546
9547   PlayLevelSoundNearest(x, y, SND_CLASS_EM_STEEL_EXIT_OPENING);
9548 }
9549
9550 static void CheckExitSP(int x, int y)
9551 {
9552   if (game.gems_still_needed > 0)
9553   {
9554     int element = Tile[x][y];
9555     int graphic = el2img(element);
9556
9557     if (IS_ANIMATED(graphic))
9558       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
9559
9560     return;
9561   }
9562
9563   // do not re-open exit door closed after last player
9564   if (game.all_players_gone)
9565     return;
9566
9567   Tile[x][y] = EL_SP_EXIT_OPENING;
9568
9569   PlayLevelSoundNearest(x, y, SND_CLASS_SP_EXIT_OPENING);
9570 }
9571
9572 static void CloseAllOpenTimegates(void)
9573 {
9574   int x, y;
9575
9576   SCAN_PLAYFIELD(x, y)
9577   {
9578     int element = Tile[x][y];
9579
9580     if (element == EL_TIMEGATE_OPEN || element == EL_TIMEGATE_OPENING)
9581     {
9582       Tile[x][y] = EL_TIMEGATE_CLOSING;
9583
9584       PlayLevelSoundAction(x, y, ACTION_CLOSING);
9585     }
9586   }
9587 }
9588
9589 static void DrawTwinkleOnField(int x, int y)
9590 {
9591   if (!IN_SCR_FIELD(SCREENX(x), SCREENY(y)) || IS_MOVING(x, y))
9592     return;
9593
9594   if (Tile[x][y] == EL_BD_DIAMOND)
9595     return;
9596
9597   if (MovDelay[x][y] == 0)      // next animation frame
9598     MovDelay[x][y] = 11 * !GetSimpleRandom(500);
9599
9600   if (MovDelay[x][y] != 0)      // wait some time before next frame
9601   {
9602     MovDelay[x][y]--;
9603
9604     DrawLevelElementAnimation(x, y, Tile[x][y]);
9605
9606     if (MovDelay[x][y] != 0)
9607     {
9608       int frame = getGraphicAnimationFrame(IMG_TWINKLE_WHITE,
9609                                            10 - MovDelay[x][y]);
9610
9611       DrawGraphicThruMask(SCREENX(x), SCREENY(y), IMG_TWINKLE_WHITE, frame);
9612     }
9613   }
9614 }
9615
9616 static void MauerWaechst(int x, int y)
9617 {
9618   int delay = 6;
9619
9620   if (!MovDelay[x][y])          // next animation frame
9621     MovDelay[x][y] = 3 * delay;
9622
9623   if (MovDelay[x][y])           // wait some time before next frame
9624   {
9625     MovDelay[x][y]--;
9626
9627     if (IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
9628     {
9629       int graphic = el_dir2img(Tile[x][y], GfxDir[x][y]);
9630       int frame = getGraphicAnimationFrame(graphic, 17 - MovDelay[x][y]);
9631
9632       DrawGraphic(SCREENX(x), SCREENY(y), graphic, frame);
9633     }
9634
9635     if (!MovDelay[x][y])
9636     {
9637       if (MovDir[x][y] == MV_LEFT)
9638       {
9639         if (IN_LEV_FIELD(x - 1, y) && IS_WALL(Tile[x - 1][y]))
9640           TEST_DrawLevelField(x - 1, y);
9641       }
9642       else if (MovDir[x][y] == MV_RIGHT)
9643       {
9644         if (IN_LEV_FIELD(x + 1, y) && IS_WALL(Tile[x + 1][y]))
9645           TEST_DrawLevelField(x + 1, y);
9646       }
9647       else if (MovDir[x][y] == MV_UP)
9648       {
9649         if (IN_LEV_FIELD(x, y - 1) && IS_WALL(Tile[x][y - 1]))
9650           TEST_DrawLevelField(x, y - 1);
9651       }
9652       else
9653       {
9654         if (IN_LEV_FIELD(x, y + 1) && IS_WALL(Tile[x][y + 1]))
9655           TEST_DrawLevelField(x, y + 1);
9656       }
9657
9658       Tile[x][y] = Store[x][y];
9659       Store[x][y] = 0;
9660       GfxDir[x][y] = MovDir[x][y] = MV_NONE;
9661       TEST_DrawLevelField(x, y);
9662     }
9663   }
9664 }
9665
9666 static void MauerAbleger(int ax, int ay)
9667 {
9668   int element = Tile[ax][ay];
9669   int graphic = el2img(element);
9670   boolean oben_frei = FALSE, unten_frei = FALSE;
9671   boolean links_frei = FALSE, rechts_frei = FALSE;
9672   boolean oben_massiv = FALSE, unten_massiv = FALSE;
9673   boolean links_massiv = FALSE, rechts_massiv = FALSE;
9674   boolean new_wall = FALSE;
9675
9676   if (IS_ANIMATED(graphic))
9677     DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
9678
9679   if (!MovDelay[ax][ay])        // start building new wall
9680     MovDelay[ax][ay] = 6;
9681
9682   if (MovDelay[ax][ay])         // wait some time before building new wall
9683   {
9684     MovDelay[ax][ay]--;
9685     if (MovDelay[ax][ay])
9686       return;
9687   }
9688
9689   if (IN_LEV_FIELD(ax, ay-1) && IS_FREE(ax, ay-1))
9690     oben_frei = TRUE;
9691   if (IN_LEV_FIELD(ax, ay+1) && IS_FREE(ax, ay+1))
9692     unten_frei = TRUE;
9693   if (IN_LEV_FIELD(ax-1, ay) && IS_FREE(ax-1, ay))
9694     links_frei = TRUE;
9695   if (IN_LEV_FIELD(ax+1, ay) && IS_FREE(ax+1, ay))
9696     rechts_frei = TRUE;
9697
9698   if (element == EL_EXPANDABLE_WALL_VERTICAL ||
9699       element == EL_EXPANDABLE_WALL_ANY)
9700   {
9701     if (oben_frei)
9702     {
9703       Tile[ax][ay-1] = EL_EXPANDABLE_WALL_GROWING;
9704       Store[ax][ay-1] = element;
9705       GfxDir[ax][ay-1] = MovDir[ax][ay-1] = MV_UP;
9706       if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay-1)))
9707         DrawGraphic(SCREENX(ax), SCREENY(ay - 1),
9708                     IMG_EXPANDABLE_WALL_GROWING_UP, 0);
9709       new_wall = TRUE;
9710     }
9711     if (unten_frei)
9712     {
9713       Tile[ax][ay+1] = EL_EXPANDABLE_WALL_GROWING;
9714       Store[ax][ay+1] = element;
9715       GfxDir[ax][ay+1] = MovDir[ax][ay+1] = MV_DOWN;
9716       if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay+1)))
9717         DrawGraphic(SCREENX(ax), SCREENY(ay + 1),
9718                     IMG_EXPANDABLE_WALL_GROWING_DOWN, 0);
9719       new_wall = TRUE;
9720     }
9721   }
9722
9723   if (element == EL_EXPANDABLE_WALL_HORIZONTAL ||
9724       element == EL_EXPANDABLE_WALL_ANY ||
9725       element == EL_EXPANDABLE_WALL ||
9726       element == EL_BD_EXPANDABLE_WALL)
9727   {
9728     if (links_frei)
9729     {
9730       Tile[ax-1][ay] = EL_EXPANDABLE_WALL_GROWING;
9731       Store[ax-1][ay] = element;
9732       GfxDir[ax-1][ay] = MovDir[ax-1][ay] = MV_LEFT;
9733       if (IN_SCR_FIELD(SCREENX(ax-1), SCREENY(ay)))
9734         DrawGraphic(SCREENX(ax - 1), SCREENY(ay),
9735                     IMG_EXPANDABLE_WALL_GROWING_LEFT, 0);
9736       new_wall = TRUE;
9737     }
9738
9739     if (rechts_frei)
9740     {
9741       Tile[ax+1][ay] = EL_EXPANDABLE_WALL_GROWING;
9742       Store[ax+1][ay] = element;
9743       GfxDir[ax+1][ay] = MovDir[ax+1][ay] = MV_RIGHT;
9744       if (IN_SCR_FIELD(SCREENX(ax+1), SCREENY(ay)))
9745         DrawGraphic(SCREENX(ax + 1), SCREENY(ay),
9746                     IMG_EXPANDABLE_WALL_GROWING_RIGHT, 0);
9747       new_wall = TRUE;
9748     }
9749   }
9750
9751   if (element == EL_EXPANDABLE_WALL && (links_frei || rechts_frei))
9752     TEST_DrawLevelField(ax, ay);
9753
9754   if (!IN_LEV_FIELD(ax, ay-1) || IS_WALL(Tile[ax][ay-1]))
9755     oben_massiv = TRUE;
9756   if (!IN_LEV_FIELD(ax, ay+1) || IS_WALL(Tile[ax][ay+1]))
9757     unten_massiv = TRUE;
9758   if (!IN_LEV_FIELD(ax-1, ay) || IS_WALL(Tile[ax-1][ay]))
9759     links_massiv = TRUE;
9760   if (!IN_LEV_FIELD(ax+1, ay) || IS_WALL(Tile[ax+1][ay]))
9761     rechts_massiv = TRUE;
9762
9763   if (((oben_massiv && unten_massiv) ||
9764        element == EL_EXPANDABLE_WALL_HORIZONTAL ||
9765        element == EL_EXPANDABLE_WALL) &&
9766       ((links_massiv && rechts_massiv) ||
9767        element == EL_EXPANDABLE_WALL_VERTICAL))
9768     Tile[ax][ay] = EL_WALL;
9769
9770   if (new_wall)
9771     PlayLevelSoundAction(ax, ay, ACTION_GROWING);
9772 }
9773
9774 static void MauerAblegerStahl(int ax, int ay)
9775 {
9776   int element = Tile[ax][ay];
9777   int graphic = el2img(element);
9778   boolean oben_frei = FALSE, unten_frei = FALSE;
9779   boolean links_frei = FALSE, rechts_frei = FALSE;
9780   boolean oben_massiv = FALSE, unten_massiv = FALSE;
9781   boolean links_massiv = FALSE, rechts_massiv = FALSE;
9782   boolean new_wall = FALSE;
9783
9784   if (IS_ANIMATED(graphic))
9785     DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
9786
9787   if (!MovDelay[ax][ay])        // start building new wall
9788     MovDelay[ax][ay] = 6;
9789
9790   if (MovDelay[ax][ay])         // wait some time before building new wall
9791   {
9792     MovDelay[ax][ay]--;
9793     if (MovDelay[ax][ay])
9794       return;
9795   }
9796
9797   if (IN_LEV_FIELD(ax, ay-1) && IS_FREE(ax, ay-1))
9798     oben_frei = TRUE;
9799   if (IN_LEV_FIELD(ax, ay+1) && IS_FREE(ax, ay+1))
9800     unten_frei = TRUE;
9801   if (IN_LEV_FIELD(ax-1, ay) && IS_FREE(ax-1, ay))
9802     links_frei = TRUE;
9803   if (IN_LEV_FIELD(ax+1, ay) && IS_FREE(ax+1, ay))
9804     rechts_frei = TRUE;
9805
9806   if (element == EL_EXPANDABLE_STEELWALL_VERTICAL ||
9807       element == EL_EXPANDABLE_STEELWALL_ANY)
9808   {
9809     if (oben_frei)
9810     {
9811       Tile[ax][ay-1] = EL_EXPANDABLE_STEELWALL_GROWING;
9812       Store[ax][ay-1] = element;
9813       GfxDir[ax][ay-1] = MovDir[ax][ay-1] = MV_UP;
9814       if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay-1)))
9815         DrawGraphic(SCREENX(ax), SCREENY(ay - 1),
9816                     IMG_EXPANDABLE_STEELWALL_GROWING_UP, 0);
9817       new_wall = TRUE;
9818     }
9819     if (unten_frei)
9820     {
9821       Tile[ax][ay+1] = EL_EXPANDABLE_STEELWALL_GROWING;
9822       Store[ax][ay+1] = element;
9823       GfxDir[ax][ay+1] = MovDir[ax][ay+1] = MV_DOWN;
9824       if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay+1)))
9825         DrawGraphic(SCREENX(ax), SCREENY(ay + 1),
9826                     IMG_EXPANDABLE_STEELWALL_GROWING_DOWN, 0);
9827       new_wall = TRUE;
9828     }
9829   }
9830
9831   if (element == EL_EXPANDABLE_STEELWALL_HORIZONTAL ||
9832       element == EL_EXPANDABLE_STEELWALL_ANY)
9833   {
9834     if (links_frei)
9835     {
9836       Tile[ax-1][ay] = EL_EXPANDABLE_STEELWALL_GROWING;
9837       Store[ax-1][ay] = element;
9838       GfxDir[ax-1][ay] = MovDir[ax-1][ay] = MV_LEFT;
9839       if (IN_SCR_FIELD(SCREENX(ax-1), SCREENY(ay)))
9840         DrawGraphic(SCREENX(ax - 1), SCREENY(ay),
9841                     IMG_EXPANDABLE_STEELWALL_GROWING_LEFT, 0);
9842       new_wall = TRUE;
9843     }
9844
9845     if (rechts_frei)
9846     {
9847       Tile[ax+1][ay] = EL_EXPANDABLE_STEELWALL_GROWING;
9848       Store[ax+1][ay] = element;
9849       GfxDir[ax+1][ay] = MovDir[ax+1][ay] = MV_RIGHT;
9850       if (IN_SCR_FIELD(SCREENX(ax+1), SCREENY(ay)))
9851         DrawGraphic(SCREENX(ax + 1), SCREENY(ay),
9852                     IMG_EXPANDABLE_STEELWALL_GROWING_RIGHT, 0);
9853       new_wall = TRUE;
9854     }
9855   }
9856
9857   if (!IN_LEV_FIELD(ax, ay-1) || IS_WALL(Tile[ax][ay-1]))
9858     oben_massiv = TRUE;
9859   if (!IN_LEV_FIELD(ax, ay+1) || IS_WALL(Tile[ax][ay+1]))
9860     unten_massiv = TRUE;
9861   if (!IN_LEV_FIELD(ax-1, ay) || IS_WALL(Tile[ax-1][ay]))
9862     links_massiv = TRUE;
9863   if (!IN_LEV_FIELD(ax+1, ay) || IS_WALL(Tile[ax+1][ay]))
9864     rechts_massiv = TRUE;
9865
9866   if (((oben_massiv && unten_massiv) ||
9867        element == EL_EXPANDABLE_STEELWALL_HORIZONTAL) &&
9868       ((links_massiv && rechts_massiv) ||
9869        element == EL_EXPANDABLE_STEELWALL_VERTICAL))
9870     Tile[ax][ay] = EL_STEELWALL;
9871
9872   if (new_wall)
9873     PlayLevelSoundAction(ax, ay, ACTION_GROWING);
9874 }
9875
9876 static void CheckForDragon(int x, int y)
9877 {
9878   int i, j;
9879   boolean dragon_found = FALSE;
9880   static int xy[4][2] =
9881   {
9882     { 0, -1 },
9883     { -1, 0 },
9884     { +1, 0 },
9885     { 0, +1 }
9886   };
9887
9888   for (i = 0; i < NUM_DIRECTIONS; i++)
9889   {
9890     for (j = 0; j < 4; j++)
9891     {
9892       int xx = x + j * xy[i][0], yy = y + j * xy[i][1];
9893
9894       if (IN_LEV_FIELD(xx, yy) &&
9895           (Tile[xx][yy] == EL_FLAMES || Tile[xx][yy] == EL_DRAGON))
9896       {
9897         if (Tile[xx][yy] == EL_DRAGON)
9898           dragon_found = TRUE;
9899       }
9900       else
9901         break;
9902     }
9903   }
9904
9905   if (!dragon_found)
9906   {
9907     for (i = 0; i < NUM_DIRECTIONS; i++)
9908     {
9909       for (j = 0; j < 3; j++)
9910       {
9911         int xx = x + j * xy[i][0], yy = y + j * xy[i][1];
9912
9913         if (IN_LEV_FIELD(xx, yy) && Tile[xx][yy] == EL_FLAMES)
9914         {
9915           Tile[xx][yy] = EL_EMPTY;
9916           TEST_DrawLevelField(xx, yy);
9917         }
9918         else
9919           break;
9920       }
9921     }
9922   }
9923 }
9924
9925 static void InitBuggyBase(int x, int y)
9926 {
9927   int element = Tile[x][y];
9928   int activating_delay = FRAMES_PER_SECOND / 4;
9929
9930   ChangeDelay[x][y] =
9931     (element == EL_SP_BUGGY_BASE ?
9932      2 * FRAMES_PER_SECOND + RND(5 * FRAMES_PER_SECOND) - activating_delay :
9933      element == EL_SP_BUGGY_BASE_ACTIVATING ?
9934      activating_delay :
9935      element == EL_SP_BUGGY_BASE_ACTIVE ?
9936      1 * FRAMES_PER_SECOND + RND(1 * FRAMES_PER_SECOND) : 1);
9937 }
9938
9939 static void WarnBuggyBase(int x, int y)
9940 {
9941   int i;
9942   static int xy[4][2] =
9943   {
9944     { 0, -1 },
9945     { -1, 0 },
9946     { +1, 0 },
9947     { 0, +1 }
9948   };
9949
9950   for (i = 0; i < NUM_DIRECTIONS; i++)
9951   {
9952     int xx = x + xy[i][0];
9953     int yy = y + xy[i][1];
9954
9955     if (IN_LEV_FIELD(xx, yy) && IS_PLAYER(xx, yy))
9956     {
9957       PlayLevelSound(x, y, SND_SP_BUGGY_BASE_ACTIVE);
9958
9959       break;
9960     }
9961   }
9962 }
9963
9964 static void InitTrap(int x, int y)
9965 {
9966   ChangeDelay[x][y] = 2 * FRAMES_PER_SECOND + RND(5 * FRAMES_PER_SECOND);
9967 }
9968
9969 static void ActivateTrap(int x, int y)
9970 {
9971   PlayLevelSound(x, y, SND_TRAP_ACTIVATING);
9972 }
9973
9974 static void ChangeActiveTrap(int x, int y)
9975 {
9976   int graphic = IMG_TRAP_ACTIVE;
9977
9978   // if new animation frame was drawn, correct crumbled sand border
9979   if (IS_NEW_FRAME(GfxFrame[x][y], graphic))
9980     TEST_DrawLevelFieldCrumbled(x, y);
9981 }
9982
9983 static int getSpecialActionElement(int element, int number, int base_element)
9984 {
9985   return (element != EL_EMPTY ? element :
9986           number != -1 ? base_element + number - 1 :
9987           EL_EMPTY);
9988 }
9989
9990 static int getModifiedActionNumber(int value_old, int operator, int operand,
9991                                    int value_min, int value_max)
9992 {
9993   int value_new = (operator == CA_MODE_SET      ? operand :
9994                    operator == CA_MODE_ADD      ? value_old + operand :
9995                    operator == CA_MODE_SUBTRACT ? value_old - operand :
9996                    operator == CA_MODE_MULTIPLY ? value_old * operand :
9997                    operator == CA_MODE_DIVIDE   ? value_old / MAX(1, operand) :
9998                    operator == CA_MODE_MODULO   ? value_old % MAX(1, operand) :
9999                    value_old);
10000
10001   return (value_new < value_min ? value_min :
10002           value_new > value_max ? value_max :
10003           value_new);
10004 }
10005
10006 static void ExecuteCustomElementAction(int x, int y, int element, int page)
10007 {
10008   struct ElementInfo *ei = &element_info[element];
10009   struct ElementChangeInfo *change = &ei->change_page[page];
10010   int target_element = change->target_element;
10011   int action_type = change->action_type;
10012   int action_mode = change->action_mode;
10013   int action_arg = change->action_arg;
10014   int action_element = change->action_element;
10015   int i;
10016
10017   if (!change->has_action)
10018     return;
10019
10020   // ---------- determine action paramater values -----------------------------
10021
10022   int level_time_value =
10023     (level.time > 0 ? TimeLeft :
10024      TimePlayed);
10025
10026   int action_arg_element_raw =
10027     (action_arg == CA_ARG_PLAYER_TRIGGER  ? change->actual_trigger_player :
10028      action_arg == CA_ARG_ELEMENT_TRIGGER ? change->actual_trigger_element :
10029      action_arg == CA_ARG_ELEMENT_TARGET  ? change->target_element :
10030      action_arg == CA_ARG_ELEMENT_ACTION  ? change->action_element :
10031      action_arg == CA_ARG_INVENTORY_RM_TRIGGER ? change->actual_trigger_element:
10032      action_arg == CA_ARG_INVENTORY_RM_TARGET  ? change->target_element :
10033      action_arg == CA_ARG_INVENTORY_RM_ACTION  ? change->action_element :
10034      EL_EMPTY);
10035   int action_arg_element = GetElementFromGroupElement(action_arg_element_raw);
10036
10037   int action_arg_direction =
10038     (action_arg >= CA_ARG_DIRECTION_LEFT &&
10039      action_arg <= CA_ARG_DIRECTION_DOWN ? action_arg - CA_ARG_DIRECTION :
10040      action_arg == CA_ARG_DIRECTION_TRIGGER ?
10041      change->actual_trigger_side :
10042      action_arg == CA_ARG_DIRECTION_TRIGGER_BACK ?
10043      MV_DIR_OPPOSITE(change->actual_trigger_side) :
10044      MV_NONE);
10045
10046   int action_arg_number_min =
10047     (action_type == CA_SET_PLAYER_SPEED ? STEPSIZE_NOT_MOVING :
10048      CA_ARG_MIN);
10049
10050   int action_arg_number_max =
10051     (action_type == CA_SET_PLAYER_SPEED ? STEPSIZE_EVEN_FASTER :
10052      action_type == CA_SET_LEVEL_GEMS ? 999 :
10053      action_type == CA_SET_LEVEL_TIME ? 9999 :
10054      action_type == CA_SET_LEVEL_SCORE ? 99999 :
10055      action_type == CA_SET_CE_VALUE ? 9999 :
10056      action_type == CA_SET_CE_SCORE ? 9999 :
10057      CA_ARG_MAX);
10058
10059   int action_arg_number_reset =
10060     (action_type == CA_SET_PLAYER_SPEED ? level.initial_player_stepsize[0] :
10061      action_type == CA_SET_LEVEL_GEMS ? level.gems_needed :
10062      action_type == CA_SET_LEVEL_TIME ? level.time :
10063      action_type == CA_SET_LEVEL_SCORE ? 0 :
10064      action_type == CA_SET_CE_VALUE ? GET_NEW_CE_VALUE(element) :
10065      action_type == CA_SET_CE_SCORE ? 0 :
10066      0);
10067
10068   int action_arg_number =
10069     (action_arg <= CA_ARG_MAX ? action_arg :
10070      action_arg >= CA_ARG_SPEED_NOT_MOVING &&
10071      action_arg <= CA_ARG_SPEED_EVEN_FASTER ? (action_arg - CA_ARG_SPEED) :
10072      action_arg == CA_ARG_SPEED_RESET ? action_arg_number_reset :
10073      action_arg == CA_ARG_NUMBER_MIN ? action_arg_number_min :
10074      action_arg == CA_ARG_NUMBER_MAX ? action_arg_number_max :
10075      action_arg == CA_ARG_NUMBER_RESET ? action_arg_number_reset :
10076      action_arg == CA_ARG_NUMBER_CE_VALUE ? CustomValue[x][y] :
10077      action_arg == CA_ARG_NUMBER_CE_SCORE ? ei->collect_score :
10078      action_arg == CA_ARG_NUMBER_CE_DELAY ? GET_CE_DELAY_VALUE(change) :
10079      action_arg == CA_ARG_NUMBER_LEVEL_TIME ? level_time_value :
10080      action_arg == CA_ARG_NUMBER_LEVEL_GEMS ? game.gems_still_needed :
10081      action_arg == CA_ARG_NUMBER_LEVEL_SCORE ? game.score :
10082      action_arg == CA_ARG_ELEMENT_CV_TARGET ? GET_NEW_CE_VALUE(target_element):
10083      action_arg == CA_ARG_ELEMENT_CV_TRIGGER ? change->actual_trigger_ce_value:
10084      action_arg == CA_ARG_ELEMENT_CV_ACTION ? GET_NEW_CE_VALUE(action_element):
10085      action_arg == CA_ARG_ELEMENT_CS_TARGET ? GET_CE_SCORE(target_element) :
10086      action_arg == CA_ARG_ELEMENT_CS_TRIGGER ? change->actual_trigger_ce_score:
10087      action_arg == CA_ARG_ELEMENT_CS_ACTION ? GET_CE_SCORE(action_element) :
10088      action_arg == CA_ARG_ELEMENT_NR_TARGET  ? change->target_element :
10089      action_arg == CA_ARG_ELEMENT_NR_TRIGGER ? change->actual_trigger_element :
10090      action_arg == CA_ARG_ELEMENT_NR_ACTION  ? change->action_element :
10091      -1);
10092
10093   int action_arg_number_old =
10094     (action_type == CA_SET_LEVEL_GEMS ? game.gems_still_needed :
10095      action_type == CA_SET_LEVEL_TIME ? TimeLeft :
10096      action_type == CA_SET_LEVEL_SCORE ? game.score :
10097      action_type == CA_SET_CE_VALUE ? CustomValue[x][y] :
10098      action_type == CA_SET_CE_SCORE ? ei->collect_score :
10099      0);
10100
10101   int action_arg_number_new =
10102     getModifiedActionNumber(action_arg_number_old,
10103                             action_mode, action_arg_number,
10104                             action_arg_number_min, action_arg_number_max);
10105
10106   int trigger_player_bits =
10107     (change->actual_trigger_player_bits != CH_PLAYER_NONE ?
10108      change->actual_trigger_player_bits : change->trigger_player);
10109
10110   int action_arg_player_bits =
10111     (action_arg >= CA_ARG_PLAYER_1 &&
10112      action_arg <= CA_ARG_PLAYER_4 ? action_arg - CA_ARG_PLAYER :
10113      action_arg == CA_ARG_PLAYER_TRIGGER ? trigger_player_bits :
10114      action_arg == CA_ARG_PLAYER_ACTION ? 1 << GET_PLAYER_NR(action_element) :
10115      PLAYER_BITS_ANY);
10116
10117   // ---------- execute action  -----------------------------------------------
10118
10119   switch (action_type)
10120   {
10121     case CA_NO_ACTION:
10122     {
10123       return;
10124     }
10125
10126     // ---------- level actions  ----------------------------------------------
10127
10128     case CA_RESTART_LEVEL:
10129     {
10130       game.restart_level = TRUE;
10131
10132       break;
10133     }
10134
10135     case CA_SHOW_ENVELOPE:
10136     {
10137       int element = getSpecialActionElement(action_arg_element,
10138                                             action_arg_number, EL_ENVELOPE_1);
10139
10140       if (IS_ENVELOPE(element))
10141         local_player->show_envelope = element;
10142
10143       break;
10144     }
10145
10146     case CA_SET_LEVEL_TIME:
10147     {
10148       if (level.time > 0)       // only modify limited time value
10149       {
10150         TimeLeft = action_arg_number_new;
10151
10152         game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
10153
10154         DisplayGameControlValues();
10155
10156         if (!TimeLeft && setup.time_limit)
10157           for (i = 0; i < MAX_PLAYERS; i++)
10158             KillPlayer(&stored_player[i]);
10159       }
10160
10161       break;
10162     }
10163
10164     case CA_SET_LEVEL_SCORE:
10165     {
10166       game.score = action_arg_number_new;
10167
10168       game_panel_controls[GAME_PANEL_SCORE].value = game.score;
10169
10170       DisplayGameControlValues();
10171
10172       break;
10173     }
10174
10175     case CA_SET_LEVEL_GEMS:
10176     {
10177       game.gems_still_needed = action_arg_number_new;
10178
10179       game.snapshot.collected_item = TRUE;
10180
10181       game_panel_controls[GAME_PANEL_GEMS].value = game.gems_still_needed;
10182
10183       DisplayGameControlValues();
10184
10185       break;
10186     }
10187
10188     case CA_SET_LEVEL_WIND:
10189     {
10190       game.wind_direction = action_arg_direction;
10191
10192       break;
10193     }
10194
10195     case CA_SET_LEVEL_RANDOM_SEED:
10196     {
10197       // ensure that setting a new random seed while playing is predictable
10198       InitRND(action_arg_number_new ? action_arg_number_new : RND(1000000) + 1);
10199
10200       break;
10201     }
10202
10203     // ---------- player actions  ---------------------------------------------
10204
10205     case CA_MOVE_PLAYER:
10206     case CA_MOVE_PLAYER_NEW:
10207     {
10208       // automatically move to the next field in specified direction
10209       for (i = 0; i < MAX_PLAYERS; i++)
10210         if (trigger_player_bits & (1 << i))
10211           if (action_type == CA_MOVE_PLAYER ||
10212               stored_player[i].MovPos == 0)
10213             stored_player[i].programmed_action = action_arg_direction;
10214
10215       break;
10216     }
10217
10218     case CA_EXIT_PLAYER:
10219     {
10220       for (i = 0; i < MAX_PLAYERS; i++)
10221         if (action_arg_player_bits & (1 << i))
10222           ExitPlayer(&stored_player[i]);
10223
10224       if (game.players_still_needed == 0)
10225         LevelSolved();
10226
10227       break;
10228     }
10229
10230     case CA_KILL_PLAYER:
10231     {
10232       for (i = 0; i < MAX_PLAYERS; i++)
10233         if (action_arg_player_bits & (1 << i))
10234           KillPlayer(&stored_player[i]);
10235
10236       break;
10237     }
10238
10239     case CA_SET_PLAYER_KEYS:
10240     {
10241       int key_state = (action_mode == CA_MODE_ADD ? TRUE : FALSE);
10242       int element = getSpecialActionElement(action_arg_element,
10243                                             action_arg_number, EL_KEY_1);
10244
10245       if (IS_KEY(element))
10246       {
10247         for (i = 0; i < MAX_PLAYERS; i++)
10248         {
10249           if (trigger_player_bits & (1 << i))
10250           {
10251             stored_player[i].key[KEY_NR(element)] = key_state;
10252
10253             DrawGameDoorValues();
10254           }
10255         }
10256       }
10257
10258       break;
10259     }
10260
10261     case CA_SET_PLAYER_SPEED:
10262     {
10263       for (i = 0; i < MAX_PLAYERS; i++)
10264       {
10265         if (trigger_player_bits & (1 << i))
10266         {
10267           int move_stepsize = TILEX / stored_player[i].move_delay_value;
10268
10269           if (action_arg == CA_ARG_SPEED_FASTER &&
10270               stored_player[i].cannot_move)
10271           {
10272             action_arg_number = STEPSIZE_VERY_SLOW;
10273           }
10274           else if (action_arg == CA_ARG_SPEED_SLOWER ||
10275                    action_arg == CA_ARG_SPEED_FASTER)
10276           {
10277             action_arg_number = 2;
10278             action_mode = (action_arg == CA_ARG_SPEED_SLOWER ? CA_MODE_DIVIDE :
10279                            CA_MODE_MULTIPLY);
10280           }
10281           else if (action_arg == CA_ARG_NUMBER_RESET)
10282           {
10283             action_arg_number = level.initial_player_stepsize[i];
10284           }
10285
10286           move_stepsize =
10287             getModifiedActionNumber(move_stepsize,
10288                                     action_mode,
10289                                     action_arg_number,
10290                                     action_arg_number_min,
10291                                     action_arg_number_max);
10292
10293           SetPlayerMoveSpeed(&stored_player[i], move_stepsize, FALSE);
10294         }
10295       }
10296
10297       break;
10298     }
10299
10300     case CA_SET_PLAYER_SHIELD:
10301     {
10302       for (i = 0; i < MAX_PLAYERS; i++)
10303       {
10304         if (trigger_player_bits & (1 << i))
10305         {
10306           if (action_arg == CA_ARG_SHIELD_OFF)
10307           {
10308             stored_player[i].shield_normal_time_left = 0;
10309             stored_player[i].shield_deadly_time_left = 0;
10310           }
10311           else if (action_arg == CA_ARG_SHIELD_NORMAL)
10312           {
10313             stored_player[i].shield_normal_time_left = 999999;
10314           }
10315           else if (action_arg == CA_ARG_SHIELD_DEADLY)
10316           {
10317             stored_player[i].shield_normal_time_left = 999999;
10318             stored_player[i].shield_deadly_time_left = 999999;
10319           }
10320         }
10321       }
10322
10323       break;
10324     }
10325
10326     case CA_SET_PLAYER_GRAVITY:
10327     {
10328       for (i = 0; i < MAX_PLAYERS; i++)
10329       {
10330         if (trigger_player_bits & (1 << i))
10331         {
10332           stored_player[i].gravity =
10333             (action_arg == CA_ARG_GRAVITY_OFF    ? FALSE                     :
10334              action_arg == CA_ARG_GRAVITY_ON     ? TRUE                      :
10335              action_arg == CA_ARG_GRAVITY_TOGGLE ? !stored_player[i].gravity :
10336              stored_player[i].gravity);
10337         }
10338       }
10339
10340       break;
10341     }
10342
10343     case CA_SET_PLAYER_ARTWORK:
10344     {
10345       for (i = 0; i < MAX_PLAYERS; i++)
10346       {
10347         if (trigger_player_bits & (1 << i))
10348         {
10349           int artwork_element = action_arg_element;
10350
10351           if (action_arg == CA_ARG_ELEMENT_RESET)
10352             artwork_element =
10353               (level.use_artwork_element[i] ? level.artwork_element[i] :
10354                stored_player[i].element_nr);
10355
10356           if (stored_player[i].artwork_element != artwork_element)
10357             stored_player[i].Frame = 0;
10358
10359           stored_player[i].artwork_element = artwork_element;
10360
10361           SetPlayerWaiting(&stored_player[i], FALSE);
10362
10363           // set number of special actions for bored and sleeping animation
10364           stored_player[i].num_special_action_bored =
10365             get_num_special_action(artwork_element,
10366                                    ACTION_BORING_1, ACTION_BORING_LAST);
10367           stored_player[i].num_special_action_sleeping =
10368             get_num_special_action(artwork_element,
10369                                    ACTION_SLEEPING_1, ACTION_SLEEPING_LAST);
10370         }
10371       }
10372
10373       break;
10374     }
10375
10376     case CA_SET_PLAYER_INVENTORY:
10377     {
10378       for (i = 0; i < MAX_PLAYERS; i++)
10379       {
10380         struct PlayerInfo *player = &stored_player[i];
10381         int j, k;
10382
10383         if (trigger_player_bits & (1 << i))
10384         {
10385           int inventory_element = action_arg_element;
10386
10387           if (action_arg == CA_ARG_ELEMENT_TARGET ||
10388               action_arg == CA_ARG_ELEMENT_TRIGGER ||
10389               action_arg == CA_ARG_ELEMENT_ACTION)
10390           {
10391             int element = inventory_element;
10392             int collect_count = element_info[element].collect_count_initial;
10393
10394             if (!IS_CUSTOM_ELEMENT(element))
10395               collect_count = 1;
10396
10397             if (collect_count == 0)
10398               player->inventory_infinite_element = element;
10399             else
10400               for (k = 0; k < collect_count; k++)
10401                 if (player->inventory_size < MAX_INVENTORY_SIZE)
10402                   player->inventory_element[player->inventory_size++] =
10403                     element;
10404           }
10405           else if (action_arg == CA_ARG_INVENTORY_RM_TARGET ||
10406                    action_arg == CA_ARG_INVENTORY_RM_TRIGGER ||
10407                    action_arg == CA_ARG_INVENTORY_RM_ACTION)
10408           {
10409             if (player->inventory_infinite_element != EL_UNDEFINED &&
10410                 IS_EQUAL_OR_IN_GROUP(player->inventory_infinite_element,
10411                                      action_arg_element_raw))
10412               player->inventory_infinite_element = EL_UNDEFINED;
10413
10414             for (k = 0, j = 0; j < player->inventory_size; j++)
10415             {
10416               if (!IS_EQUAL_OR_IN_GROUP(player->inventory_element[j],
10417                                         action_arg_element_raw))
10418                 player->inventory_element[k++] = player->inventory_element[j];
10419             }
10420
10421             player->inventory_size = k;
10422           }
10423           else if (action_arg == CA_ARG_INVENTORY_RM_FIRST)
10424           {
10425             if (player->inventory_size > 0)
10426             {
10427               for (j = 0; j < player->inventory_size - 1; j++)
10428                 player->inventory_element[j] = player->inventory_element[j + 1];
10429
10430               player->inventory_size--;
10431             }
10432           }
10433           else if (action_arg == CA_ARG_INVENTORY_RM_LAST)
10434           {
10435             if (player->inventory_size > 0)
10436               player->inventory_size--;
10437           }
10438           else if (action_arg == CA_ARG_INVENTORY_RM_ALL)
10439           {
10440             player->inventory_infinite_element = EL_UNDEFINED;
10441             player->inventory_size = 0;
10442           }
10443           else if (action_arg == CA_ARG_INVENTORY_RESET)
10444           {
10445             player->inventory_infinite_element = EL_UNDEFINED;
10446             player->inventory_size = 0;
10447
10448             if (level.use_initial_inventory[i])
10449             {
10450               for (j = 0; j < level.initial_inventory_size[i]; j++)
10451               {
10452                 int element = level.initial_inventory_content[i][j];
10453                 int collect_count = element_info[element].collect_count_initial;
10454
10455                 if (!IS_CUSTOM_ELEMENT(element))
10456                   collect_count = 1;
10457
10458                 if (collect_count == 0)
10459                   player->inventory_infinite_element = element;
10460                 else
10461                   for (k = 0; k < collect_count; k++)
10462                     if (player->inventory_size < MAX_INVENTORY_SIZE)
10463                       player->inventory_element[player->inventory_size++] =
10464                         element;
10465               }
10466             }
10467           }
10468         }
10469       }
10470
10471       break;
10472     }
10473
10474     // ---------- CE actions  -------------------------------------------------
10475
10476     case CA_SET_CE_VALUE:
10477     {
10478       int last_ce_value = CustomValue[x][y];
10479
10480       CustomValue[x][y] = action_arg_number_new;
10481
10482       if (CustomValue[x][y] != last_ce_value)
10483       {
10484         CheckElementChange(x, y, element, EL_UNDEFINED, CE_VALUE_CHANGES);
10485         CheckTriggeredElementChange(x, y, element, CE_VALUE_CHANGES_OF_X);
10486
10487         if (CustomValue[x][y] == 0)
10488         {
10489           // reset change counter (else CE_VALUE_GETS_ZERO would not work)
10490           ChangeCount[x][y] = 0;        // allow at least one more change
10491
10492           CheckElementChange(x, y, element, EL_UNDEFINED, CE_VALUE_GETS_ZERO);
10493           CheckTriggeredElementChange(x, y, element, CE_VALUE_GETS_ZERO_OF_X);
10494         }
10495       }
10496
10497       break;
10498     }
10499
10500     case CA_SET_CE_SCORE:
10501     {
10502       int last_ce_score = ei->collect_score;
10503
10504       ei->collect_score = action_arg_number_new;
10505
10506       if (ei->collect_score != last_ce_score)
10507       {
10508         CheckElementChange(x, y, element, EL_UNDEFINED, CE_SCORE_CHANGES);
10509         CheckTriggeredElementChange(x, y, element, CE_SCORE_CHANGES_OF_X);
10510
10511         if (ei->collect_score == 0)
10512         {
10513           int xx, yy;
10514
10515           // reset change counter (else CE_SCORE_GETS_ZERO would not work)
10516           ChangeCount[x][y] = 0;        // allow at least one more change
10517
10518           CheckElementChange(x, y, element, EL_UNDEFINED, CE_SCORE_GETS_ZERO);
10519           CheckTriggeredElementChange(x, y, element, CE_SCORE_GETS_ZERO_OF_X);
10520
10521           /*
10522             This is a very special case that seems to be a mixture between
10523             CheckElementChange() and CheckTriggeredElementChange(): while
10524             the first one only affects single elements that are triggered
10525             directly, the second one affects multiple elements in the playfield
10526             that are triggered indirectly by another element. This is a third
10527             case: Changing the CE score always affects multiple identical CEs,
10528             so every affected CE must be checked, not only the single CE for
10529             which the CE score was changed in the first place (as every instance
10530             of that CE shares the same CE score, and therefore also can change)!
10531           */
10532           SCAN_PLAYFIELD(xx, yy)
10533           {
10534             if (Tile[xx][yy] == element)
10535               CheckElementChange(xx, yy, element, EL_UNDEFINED,
10536                                  CE_SCORE_GETS_ZERO);
10537           }
10538         }
10539       }
10540
10541       break;
10542     }
10543
10544     case CA_SET_CE_ARTWORK:
10545     {
10546       int artwork_element = action_arg_element;
10547       boolean reset_frame = FALSE;
10548       int xx, yy;
10549
10550       if (action_arg == CA_ARG_ELEMENT_RESET)
10551         artwork_element = (ei->use_gfx_element ? ei->gfx_element_initial :
10552                            element);
10553
10554       if (ei->gfx_element != artwork_element)
10555         reset_frame = TRUE;
10556
10557       ei->gfx_element = artwork_element;
10558
10559       SCAN_PLAYFIELD(xx, yy)
10560       {
10561         if (Tile[xx][yy] == element)
10562         {
10563           if (reset_frame)
10564           {
10565             ResetGfxAnimation(xx, yy);
10566             ResetRandomAnimationValue(xx, yy);
10567           }
10568
10569           TEST_DrawLevelField(xx, yy);
10570         }
10571       }
10572
10573       break;
10574     }
10575
10576     // ---------- engine actions  ---------------------------------------------
10577
10578     case CA_SET_ENGINE_SCAN_MODE:
10579     {
10580       InitPlayfieldScanMode(action_arg);
10581
10582       break;
10583     }
10584
10585     default:
10586       break;
10587   }
10588 }
10589
10590 static void CreateFieldExt(int x, int y, int element, boolean is_change)
10591 {
10592   int old_element = Tile[x][y];
10593   int new_element = GetElementFromGroupElement(element);
10594   int previous_move_direction = MovDir[x][y];
10595   int last_ce_value = CustomValue[x][y];
10596   boolean player_explosion_protected = PLAYER_EXPLOSION_PROTECTED(x, y);
10597   boolean new_element_is_player = ELEM_IS_PLAYER(new_element);
10598   boolean add_player_onto_element = (new_element_is_player &&
10599                                      new_element != EL_SOKOBAN_FIELD_PLAYER &&
10600                                      IS_WALKABLE(old_element));
10601
10602   if (!add_player_onto_element)
10603   {
10604     if (IS_MOVING(x, y) || IS_BLOCKED(x, y))
10605       RemoveMovingField(x, y);
10606     else
10607       RemoveField(x, y);
10608
10609     Tile[x][y] = new_element;
10610
10611     if (element_info[new_element].move_direction_initial == MV_START_PREVIOUS)
10612       MovDir[x][y] = previous_move_direction;
10613
10614     if (element_info[new_element].use_last_ce_value)
10615       CustomValue[x][y] = last_ce_value;
10616
10617     InitField_WithBug1(x, y, FALSE);
10618
10619     new_element = Tile[x][y];   // element may have changed
10620
10621     ResetGfxAnimation(x, y);
10622     ResetRandomAnimationValue(x, y);
10623
10624     TEST_DrawLevelField(x, y);
10625
10626     if (GFX_CRUMBLED(new_element))
10627       TEST_DrawLevelFieldCrumbledNeighbours(x, y);
10628   }
10629
10630   // check if element under the player changes from accessible to unaccessible
10631   // (needed for special case of dropping element which then changes)
10632   // (must be checked after creating new element for walkable group elements)
10633   if (IS_PLAYER(x, y) && !player_explosion_protected &&
10634       IS_ACCESSIBLE(old_element) && !IS_ACCESSIBLE(new_element))
10635   {
10636     Bang(x, y);
10637
10638     return;
10639   }
10640
10641   // "ChangeCount" not set yet to allow "entered by player" change one time
10642   if (new_element_is_player)
10643     RelocatePlayer(x, y, new_element);
10644
10645   if (is_change)
10646     ChangeCount[x][y]++;        // count number of changes in the same frame
10647
10648   TestIfBadThingTouchesPlayer(x, y);
10649   TestIfPlayerTouchesCustomElement(x, y);
10650   TestIfElementTouchesCustomElement(x, y);
10651 }
10652
10653 static void CreateField(int x, int y, int element)
10654 {
10655   CreateFieldExt(x, y, element, FALSE);
10656 }
10657
10658 static void CreateElementFromChange(int x, int y, int element)
10659 {
10660   element = GET_VALID_RUNTIME_ELEMENT(element);
10661
10662   if (game.engine_version >= VERSION_IDENT(3,2,0,7))
10663   {
10664     int old_element = Tile[x][y];
10665
10666     // prevent changed element from moving in same engine frame
10667     // unless both old and new element can either fall or move
10668     if ((!CAN_FALL(old_element) || !CAN_FALL(element)) &&
10669         (!CAN_MOVE(old_element) || !CAN_MOVE(element)))
10670       Stop[x][y] = TRUE;
10671   }
10672
10673   CreateFieldExt(x, y, element, TRUE);
10674 }
10675
10676 static boolean ChangeElement(int x, int y, int element, int page)
10677 {
10678   struct ElementInfo *ei = &element_info[element];
10679   struct ElementChangeInfo *change = &ei->change_page[page];
10680   int ce_value = CustomValue[x][y];
10681   int ce_score = ei->collect_score;
10682   int target_element;
10683   int old_element = Tile[x][y];
10684
10685   // always use default change event to prevent running into a loop
10686   if (ChangeEvent[x][y] == -1)
10687     ChangeEvent[x][y] = CE_DELAY;
10688
10689   if (ChangeEvent[x][y] == CE_DELAY)
10690   {
10691     // reset actual trigger element, trigger player and action element
10692     change->actual_trigger_element = EL_EMPTY;
10693     change->actual_trigger_player = EL_EMPTY;
10694     change->actual_trigger_player_bits = CH_PLAYER_NONE;
10695     change->actual_trigger_side = CH_SIDE_NONE;
10696     change->actual_trigger_ce_value = 0;
10697     change->actual_trigger_ce_score = 0;
10698   }
10699
10700   // do not change elements more than a specified maximum number of changes
10701   if (ChangeCount[x][y] >= game.max_num_changes_per_frame)
10702     return FALSE;
10703
10704   ChangeCount[x][y]++;          // count number of changes in the same frame
10705
10706   if (change->explode)
10707   {
10708     Bang(x, y);
10709
10710     return TRUE;
10711   }
10712
10713   if (change->use_target_content)
10714   {
10715     boolean complete_replace = TRUE;
10716     boolean can_replace[3][3];
10717     int xx, yy;
10718
10719     for (yy = 0; yy < 3; yy++) for (xx = 0; xx < 3 ; xx++)
10720     {
10721       boolean is_empty;
10722       boolean is_walkable;
10723       boolean is_diggable;
10724       boolean is_collectible;
10725       boolean is_removable;
10726       boolean is_destructible;
10727       int ex = x + xx - 1;
10728       int ey = y + yy - 1;
10729       int content_element = change->target_content.e[xx][yy];
10730       int e;
10731
10732       can_replace[xx][yy] = TRUE;
10733
10734       if (ex == x && ey == y)   // do not check changing element itself
10735         continue;
10736
10737       if (content_element == EL_EMPTY_SPACE)
10738       {
10739         can_replace[xx][yy] = FALSE;    // do not replace border with space
10740
10741         continue;
10742       }
10743
10744       if (!IN_LEV_FIELD(ex, ey))
10745       {
10746         can_replace[xx][yy] = FALSE;
10747         complete_replace = FALSE;
10748
10749         continue;
10750       }
10751
10752       e = Tile[ex][ey];
10753
10754       if (IS_MOVING(ex, ey) || IS_BLOCKED(ex, ey))
10755         e = MovingOrBlocked2Element(ex, ey);
10756
10757       is_empty = (IS_FREE(ex, ey) ||
10758                   (IS_FREE_OR_PLAYER(ex, ey) && IS_WALKABLE(content_element)));
10759
10760       is_walkable     = (is_empty || IS_WALKABLE(e));
10761       is_diggable     = (is_empty || IS_DIGGABLE(e));
10762       is_collectible  = (is_empty || IS_COLLECTIBLE(e));
10763       is_destructible = (is_empty || !IS_INDESTRUCTIBLE(e));
10764       is_removable    = (is_diggable || is_collectible);
10765
10766       can_replace[xx][yy] =
10767         (((change->replace_when == CP_WHEN_EMPTY        && is_empty) ||
10768           (change->replace_when == CP_WHEN_WALKABLE     && is_walkable) ||
10769           (change->replace_when == CP_WHEN_DIGGABLE     && is_diggable) ||
10770           (change->replace_when == CP_WHEN_COLLECTIBLE  && is_collectible) ||
10771           (change->replace_when == CP_WHEN_REMOVABLE    && is_removable) ||
10772           (change->replace_when == CP_WHEN_DESTRUCTIBLE && is_destructible)) &&
10773          !(IS_PLAYER(ex, ey) && ELEM_IS_PLAYER(content_element)));
10774
10775       if (!can_replace[xx][yy])
10776         complete_replace = FALSE;
10777     }
10778
10779     if (!change->only_if_complete || complete_replace)
10780     {
10781       boolean something_has_changed = FALSE;
10782
10783       if (change->only_if_complete && change->use_random_replace &&
10784           RND(100) < change->random_percentage)
10785         return FALSE;
10786
10787       for (yy = 0; yy < 3; yy++) for (xx = 0; xx < 3 ; xx++)
10788       {
10789         int ex = x + xx - 1;
10790         int ey = y + yy - 1;
10791         int content_element;
10792
10793         if (can_replace[xx][yy] && (!change->use_random_replace ||
10794                                     RND(100) < change->random_percentage))
10795         {
10796           if (IS_MOVING(ex, ey) || IS_BLOCKED(ex, ey))
10797             RemoveMovingField(ex, ey);
10798
10799           ChangeEvent[ex][ey] = ChangeEvent[x][y];
10800
10801           content_element = change->target_content.e[xx][yy];
10802           target_element = GET_TARGET_ELEMENT(element, content_element, change,
10803                                               ce_value, ce_score);
10804
10805           CreateElementFromChange(ex, ey, target_element);
10806
10807           something_has_changed = TRUE;
10808
10809           // for symmetry reasons, freeze newly created border elements
10810           if (ex != x || ey != y)
10811             Stop[ex][ey] = TRUE;        // no more moving in this frame
10812         }
10813       }
10814
10815       if (something_has_changed)
10816       {
10817         PlayLevelSoundElementAction(x, y, element, ACTION_CHANGING);
10818         PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + page);
10819       }
10820     }
10821   }
10822   else
10823   {
10824     target_element = GET_TARGET_ELEMENT(element, change->target_element, change,
10825                                         ce_value, ce_score);
10826
10827     if (element == EL_DIAGONAL_GROWING ||
10828         element == EL_DIAGONAL_SHRINKING)
10829     {
10830       target_element = Store[x][y];
10831
10832       Store[x][y] = EL_EMPTY;
10833     }
10834
10835     CreateElementFromChange(x, y, target_element);
10836
10837     PlayLevelSoundElementAction(x, y, element, ACTION_CHANGING);
10838     PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + page);
10839   }
10840
10841   // this uses direct change before indirect change
10842   CheckTriggeredElementChangeByPage(x, y, old_element, CE_CHANGE_OF_X, page);
10843
10844   return TRUE;
10845 }
10846
10847 static void HandleElementChange(int x, int y, int page)
10848 {
10849   int element = MovingOrBlocked2Element(x, y);
10850   struct ElementInfo *ei = &element_info[element];
10851   struct ElementChangeInfo *change = &ei->change_page[page];
10852   boolean handle_action_before_change = FALSE;
10853
10854 #ifdef DEBUG
10855   if (!CAN_CHANGE_OR_HAS_ACTION(element) &&
10856       !CAN_CHANGE_OR_HAS_ACTION(Back[x][y]))
10857   {
10858     Debug("game:playing:HandleElementChange", "%d,%d: element = %d ('%s')",
10859           x, y, element, element_info[element].token_name);
10860     Debug("game:playing:HandleElementChange", "This should never happen!");
10861   }
10862 #endif
10863
10864   // this can happen with classic bombs on walkable, changing elements
10865   if (!CAN_CHANGE_OR_HAS_ACTION(element))
10866   {
10867     return;
10868   }
10869
10870   if (ChangeDelay[x][y] == 0)           // initialize element change
10871   {
10872     ChangeDelay[x][y] = GET_CHANGE_DELAY(change) + 1;
10873
10874     if (change->can_change)
10875     {
10876       // !!! not clear why graphic animation should be reset at all here !!!
10877       // !!! UPDATE: but is needed for correct Snake Bite tail animation !!!
10878       // !!! SOLUTION: do not reset if graphics engine set to 4 or above !!!
10879
10880       /*
10881         GRAPHICAL BUG ADDRESSED BY CHECKING GRAPHICS ENGINE VERSION:
10882
10883         When using an animation frame delay of 1 (this only happens with
10884         "sp_zonk.moving.left/right" in the classic graphics), the default
10885         (non-moving) animation shows wrong animation frames (while the
10886         moving animation, like "sp_zonk.moving.left/right", is correct,
10887         so this graphical bug never shows up with the classic graphics).
10888         For an animation with 4 frames, this causes wrong frames 0,0,1,2
10889         be drawn instead of the correct frames 0,1,2,3. This is caused by
10890         "GfxFrame[][]" being reset *twice* (in two successive frames) after
10891         an element change: First when the change delay ("ChangeDelay[][]")
10892         counter has reached zero after decrementing, then a second time in
10893         the next frame (after "GfxFrame[][]" was already incremented) when
10894         "ChangeDelay[][]" is reset to the initial delay value again.
10895
10896         This causes frame 0 to be drawn twice, while the last frame won't
10897         be drawn anymore, resulting in the wrong frame sequence 0,0,1,2.
10898
10899         As some animations may already be cleverly designed around this bug
10900         (at least the "Snake Bite" snake tail animation does this), it cannot
10901         simply be fixed here without breaking such existing animations.
10902         Unfortunately, it cannot easily be detected if a graphics set was
10903         designed "before" or "after" the bug was fixed. As a workaround,
10904         a new graphics set option "game.graphics_engine_version" was added
10905         to be able to specify the game's major release version for which the
10906         graphics set was designed, which can then be used to decide if the
10907         bugfix should be used (version 4 and above) or not (version 3 or
10908         below, or if no version was specified at all, as with old sets).
10909
10910         (The wrong/fixed animation frames can be tested with the test level set
10911         "test_gfxframe" and level "000", which contains a specially prepared
10912         custom element at level position (x/y) == (11/9) which uses the zonk
10913         animation mentioned above. Using "game.graphics_engine_version: 4"
10914         fixes the wrong animation frames, showing the correct frames 0,1,2,3.
10915         This can also be seen from the debug output for this test element.)
10916       */
10917
10918       // when a custom element is about to change (for example by change delay),
10919       // do not reset graphic animation when the custom element is moving
10920       if (game.graphics_engine_version < 4 &&
10921           !IS_MOVING(x, y))
10922       {
10923         ResetGfxAnimation(x, y);
10924         ResetRandomAnimationValue(x, y);
10925       }
10926
10927       if (change->pre_change_function)
10928         change->pre_change_function(x, y);
10929     }
10930   }
10931
10932   ChangeDelay[x][y]--;
10933
10934   if (ChangeDelay[x][y] != 0)           // continue element change
10935   {
10936     if (change->can_change)
10937     {
10938       int graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
10939
10940       if (IS_ANIMATED(graphic))
10941         DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
10942
10943       if (change->change_function)
10944         change->change_function(x, y);
10945     }
10946   }
10947   else                                  // finish element change
10948   {
10949     if (ChangePage[x][y] != -1)         // remember page from delayed change
10950     {
10951       page = ChangePage[x][y];
10952       ChangePage[x][y] = -1;
10953
10954       change = &ei->change_page[page];
10955     }
10956
10957     if (IS_MOVING(x, y))                // never change a running system ;-)
10958     {
10959       ChangeDelay[x][y] = 1;            // try change after next move step
10960       ChangePage[x][y] = page;          // remember page to use for change
10961
10962       return;
10963     }
10964
10965     // special case: set new level random seed before changing element
10966     if (change->has_action && change->action_type == CA_SET_LEVEL_RANDOM_SEED)
10967       handle_action_before_change = TRUE;
10968
10969     if (change->has_action && handle_action_before_change)
10970       ExecuteCustomElementAction(x, y, element, page);
10971
10972     if (change->can_change)
10973     {
10974       if (ChangeElement(x, y, element, page))
10975       {
10976         if (change->post_change_function)
10977           change->post_change_function(x, y);
10978       }
10979     }
10980
10981     if (change->has_action && !handle_action_before_change)
10982       ExecuteCustomElementAction(x, y, element, page);
10983   }
10984 }
10985
10986 static boolean CheckTriggeredElementChangeExt(int trigger_x, int trigger_y,
10987                                               int trigger_element,
10988                                               int trigger_event,
10989                                               int trigger_player,
10990                                               int trigger_side,
10991                                               int trigger_page)
10992 {
10993   boolean change_done_any = FALSE;
10994   int trigger_page_bits = (trigger_page < 0 ? CH_PAGE_ANY : 1 << trigger_page);
10995   int i;
10996
10997   if (!(trigger_events[trigger_element][trigger_event]))
10998     return FALSE;
10999
11000   RECURSION_LOOP_DETECTION_START(trigger_element, FALSE);
11001
11002   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
11003   {
11004     int element = EL_CUSTOM_START + i;
11005     boolean change_done = FALSE;
11006     int p;
11007
11008     if (!CAN_CHANGE_OR_HAS_ACTION(element) ||
11009         !HAS_ANY_CHANGE_EVENT(element, trigger_event))
11010       continue;
11011
11012     for (p = 0; p < element_info[element].num_change_pages; p++)
11013     {
11014       struct ElementChangeInfo *change = &element_info[element].change_page[p];
11015
11016       if (change->can_change_or_has_action &&
11017           change->has_event[trigger_event] &&
11018           change->trigger_side & trigger_side &&
11019           change->trigger_player & trigger_player &&
11020           change->trigger_page & trigger_page_bits &&
11021           IS_EQUAL_OR_IN_GROUP(trigger_element, change->trigger_element))
11022       {
11023         change->actual_trigger_element = trigger_element;
11024         change->actual_trigger_player = GET_PLAYER_FROM_BITS(trigger_player);
11025         change->actual_trigger_player_bits = trigger_player;
11026         change->actual_trigger_side = trigger_side;
11027         change->actual_trigger_ce_value = CustomValue[trigger_x][trigger_y];
11028         change->actual_trigger_ce_score = GET_CE_SCORE(trigger_element);
11029
11030         if ((change->can_change && !change_done) || change->has_action)
11031         {
11032           int x, y;
11033
11034           SCAN_PLAYFIELD(x, y)
11035           {
11036             if (Tile[x][y] == element)
11037             {
11038               if (change->can_change && !change_done)
11039               {
11040                 // if element already changed in this frame, not only prevent
11041                 // another element change (checked in ChangeElement()), but
11042                 // also prevent additional element actions for this element
11043
11044                 if (ChangeCount[x][y] >= game.max_num_changes_per_frame &&
11045                     !level.use_action_after_change_bug)
11046                   continue;
11047
11048                 ChangeDelay[x][y] = 1;
11049                 ChangeEvent[x][y] = trigger_event;
11050
11051                 HandleElementChange(x, y, p);
11052               }
11053               else if (change->has_action)
11054               {
11055                 // if element already changed in this frame, not only prevent
11056                 // another element change (checked in ChangeElement()), but
11057                 // also prevent additional element actions for this element
11058
11059                 if (ChangeCount[x][y] >= game.max_num_changes_per_frame &&
11060                     !level.use_action_after_change_bug)
11061                   continue;
11062
11063                 ExecuteCustomElementAction(x, y, element, p);
11064                 PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + p);
11065               }
11066             }
11067           }
11068
11069           if (change->can_change)
11070           {
11071             change_done = TRUE;
11072             change_done_any = TRUE;
11073           }
11074         }
11075       }
11076     }
11077   }
11078
11079   RECURSION_LOOP_DETECTION_END();
11080
11081   return change_done_any;
11082 }
11083
11084 static boolean CheckElementChangeExt(int x, int y,
11085                                      int element,
11086                                      int trigger_element,
11087                                      int trigger_event,
11088                                      int trigger_player,
11089                                      int trigger_side)
11090 {
11091   boolean change_done = FALSE;
11092   int p;
11093
11094   if (!CAN_CHANGE_OR_HAS_ACTION(element) ||
11095       !HAS_ANY_CHANGE_EVENT(element, trigger_event))
11096     return FALSE;
11097
11098   if (Tile[x][y] == EL_BLOCKED)
11099   {
11100     Blocked2Moving(x, y, &x, &y);
11101     element = Tile[x][y];
11102   }
11103
11104   // check if element has already changed or is about to change after moving
11105   if ((game.engine_version < VERSION_IDENT(3,2,0,7) &&
11106        Tile[x][y] != element) ||
11107
11108       (game.engine_version >= VERSION_IDENT(3,2,0,7) &&
11109        (ChangeCount[x][y] >= game.max_num_changes_per_frame ||
11110         ChangePage[x][y] != -1)))
11111     return FALSE;
11112
11113   RECURSION_LOOP_DETECTION_START(trigger_element, FALSE);
11114
11115   for (p = 0; p < element_info[element].num_change_pages; p++)
11116   {
11117     struct ElementChangeInfo *change = &element_info[element].change_page[p];
11118
11119     /* check trigger element for all events where the element that is checked
11120        for changing interacts with a directly adjacent element -- this is
11121        different to element changes that affect other elements to change on the
11122        whole playfield (which is handeld by CheckTriggeredElementChangeExt()) */
11123     boolean check_trigger_element =
11124       (trigger_event == CE_TOUCHING_X ||
11125        trigger_event == CE_HITTING_X ||
11126        trigger_event == CE_HIT_BY_X ||
11127        trigger_event == CE_DIGGING_X); // this one was forgotten until 3.2.3
11128
11129     if (change->can_change_or_has_action &&
11130         change->has_event[trigger_event] &&
11131         change->trigger_side & trigger_side &&
11132         change->trigger_player & trigger_player &&
11133         (!check_trigger_element ||
11134          IS_EQUAL_OR_IN_GROUP(trigger_element, change->trigger_element)))
11135     {
11136       change->actual_trigger_element = trigger_element;
11137       change->actual_trigger_player = GET_PLAYER_FROM_BITS(trigger_player);
11138       change->actual_trigger_player_bits = trigger_player;
11139       change->actual_trigger_side = trigger_side;
11140       change->actual_trigger_ce_value = CustomValue[x][y];
11141       change->actual_trigger_ce_score = GET_CE_SCORE(trigger_element);
11142
11143       // special case: trigger element not at (x,y) position for some events
11144       if (check_trigger_element)
11145       {
11146         static struct
11147         {
11148           int dx, dy;
11149         } move_xy[] =
11150           {
11151             {  0,  0 },
11152             { -1,  0 },
11153             { +1,  0 },
11154             {  0,  0 },
11155             {  0, -1 },
11156             {  0,  0 }, { 0, 0 }, { 0, 0 },
11157             {  0, +1 }
11158           };
11159
11160         int xx = x + move_xy[MV_DIR_OPPOSITE(trigger_side)].dx;
11161         int yy = y + move_xy[MV_DIR_OPPOSITE(trigger_side)].dy;
11162
11163         change->actual_trigger_ce_value = CustomValue[xx][yy];
11164         change->actual_trigger_ce_score = GET_CE_SCORE(trigger_element);
11165       }
11166
11167       if (change->can_change && !change_done)
11168       {
11169         ChangeDelay[x][y] = 1;
11170         ChangeEvent[x][y] = trigger_event;
11171
11172         HandleElementChange(x, y, p);
11173
11174         change_done = TRUE;
11175       }
11176       else if (change->has_action)
11177       {
11178         ExecuteCustomElementAction(x, y, element, p);
11179         PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + p);
11180       }
11181     }
11182   }
11183
11184   RECURSION_LOOP_DETECTION_END();
11185
11186   return change_done;
11187 }
11188
11189 static void PlayPlayerSound(struct PlayerInfo *player)
11190 {
11191   int jx = player->jx, jy = player->jy;
11192   int sound_element = player->artwork_element;
11193   int last_action = player->last_action_waiting;
11194   int action = player->action_waiting;
11195
11196   if (player->is_waiting)
11197   {
11198     if (action != last_action)
11199       PlayLevelSoundElementAction(jx, jy, sound_element, action);
11200     else
11201       PlayLevelSoundElementActionIfLoop(jx, jy, sound_element, action);
11202   }
11203   else
11204   {
11205     if (action != last_action)
11206       StopSound(element_info[sound_element].sound[last_action]);
11207
11208     if (last_action == ACTION_SLEEPING)
11209       PlayLevelSoundElementAction(jx, jy, sound_element, ACTION_AWAKENING);
11210   }
11211 }
11212
11213 static void PlayAllPlayersSound(void)
11214 {
11215   int i;
11216
11217   for (i = 0; i < MAX_PLAYERS; i++)
11218     if (stored_player[i].active)
11219       PlayPlayerSound(&stored_player[i]);
11220 }
11221
11222 static void SetPlayerWaiting(struct PlayerInfo *player, boolean is_waiting)
11223 {
11224   boolean last_waiting = player->is_waiting;
11225   int move_dir = player->MovDir;
11226
11227   player->dir_waiting = move_dir;
11228   player->last_action_waiting = player->action_waiting;
11229
11230   if (is_waiting)
11231   {
11232     if (!last_waiting)          // not waiting -> waiting
11233     {
11234       player->is_waiting = TRUE;
11235
11236       player->frame_counter_bored =
11237         FrameCounter +
11238         game.player_boring_delay_fixed +
11239         GetSimpleRandom(game.player_boring_delay_random);
11240       player->frame_counter_sleeping =
11241         FrameCounter +
11242         game.player_sleeping_delay_fixed +
11243         GetSimpleRandom(game.player_sleeping_delay_random);
11244
11245       InitPlayerGfxAnimation(player, ACTION_WAITING, move_dir);
11246     }
11247
11248     if (game.player_sleeping_delay_fixed +
11249         game.player_sleeping_delay_random > 0 &&
11250         player->anim_delay_counter == 0 &&
11251         player->post_delay_counter == 0 &&
11252         FrameCounter >= player->frame_counter_sleeping)
11253       player->is_sleeping = TRUE;
11254     else if (game.player_boring_delay_fixed +
11255              game.player_boring_delay_random > 0 &&
11256              FrameCounter >= player->frame_counter_bored)
11257       player->is_bored = TRUE;
11258
11259     player->action_waiting = (player->is_sleeping ? ACTION_SLEEPING :
11260                               player->is_bored ? ACTION_BORING :
11261                               ACTION_WAITING);
11262
11263     if (player->is_sleeping && player->use_murphy)
11264     {
11265       // special case for sleeping Murphy when leaning against non-free tile
11266
11267       if (!IN_LEV_FIELD(player->jx - 1, player->jy) ||
11268           (Tile[player->jx - 1][player->jy] != EL_EMPTY &&
11269            !IS_MOVING(player->jx - 1, player->jy)))
11270         move_dir = MV_LEFT;
11271       else if (!IN_LEV_FIELD(player->jx + 1, player->jy) ||
11272                (Tile[player->jx + 1][player->jy] != EL_EMPTY &&
11273                 !IS_MOVING(player->jx + 1, player->jy)))
11274         move_dir = MV_RIGHT;
11275       else
11276         player->is_sleeping = FALSE;
11277
11278       player->dir_waiting = move_dir;
11279     }
11280
11281     if (player->is_sleeping)
11282     {
11283       if (player->num_special_action_sleeping > 0)
11284       {
11285         if (player->anim_delay_counter == 0 && player->post_delay_counter == 0)
11286         {
11287           int last_special_action = player->special_action_sleeping;
11288           int num_special_action = player->num_special_action_sleeping;
11289           int special_action =
11290             (last_special_action == ACTION_DEFAULT ? ACTION_SLEEPING_1 :
11291              last_special_action == ACTION_SLEEPING ? ACTION_SLEEPING :
11292              last_special_action < ACTION_SLEEPING_1 + num_special_action - 1 ?
11293              last_special_action + 1 : ACTION_SLEEPING);
11294           int special_graphic =
11295             el_act_dir2img(player->artwork_element, special_action, move_dir);
11296
11297           player->anim_delay_counter =
11298             graphic_info[special_graphic].anim_delay_fixed +
11299             GetSimpleRandom(graphic_info[special_graphic].anim_delay_random);
11300           player->post_delay_counter =
11301             graphic_info[special_graphic].post_delay_fixed +
11302             GetSimpleRandom(graphic_info[special_graphic].post_delay_random);
11303
11304           player->special_action_sleeping = special_action;
11305         }
11306
11307         if (player->anim_delay_counter > 0)
11308         {
11309           player->action_waiting = player->special_action_sleeping;
11310           player->anim_delay_counter--;
11311         }
11312         else if (player->post_delay_counter > 0)
11313         {
11314           player->post_delay_counter--;
11315         }
11316       }
11317     }
11318     else if (player->is_bored)
11319     {
11320       if (player->num_special_action_bored > 0)
11321       {
11322         if (player->anim_delay_counter == 0 && player->post_delay_counter == 0)
11323         {
11324           int special_action =
11325             ACTION_BORING_1 + GetSimpleRandom(player->num_special_action_bored);
11326           int special_graphic =
11327             el_act_dir2img(player->artwork_element, special_action, move_dir);
11328
11329           player->anim_delay_counter =
11330             graphic_info[special_graphic].anim_delay_fixed +
11331             GetSimpleRandom(graphic_info[special_graphic].anim_delay_random);
11332           player->post_delay_counter =
11333             graphic_info[special_graphic].post_delay_fixed +
11334             GetSimpleRandom(graphic_info[special_graphic].post_delay_random);
11335
11336           player->special_action_bored = special_action;
11337         }
11338
11339         if (player->anim_delay_counter > 0)
11340         {
11341           player->action_waiting = player->special_action_bored;
11342           player->anim_delay_counter--;
11343         }
11344         else if (player->post_delay_counter > 0)
11345         {
11346           player->post_delay_counter--;
11347         }
11348       }
11349     }
11350   }
11351   else if (last_waiting)        // waiting -> not waiting
11352   {
11353     player->is_waiting = FALSE;
11354     player->is_bored = FALSE;
11355     player->is_sleeping = FALSE;
11356
11357     player->frame_counter_bored = -1;
11358     player->frame_counter_sleeping = -1;
11359
11360     player->anim_delay_counter = 0;
11361     player->post_delay_counter = 0;
11362
11363     player->dir_waiting = player->MovDir;
11364     player->action_waiting = ACTION_DEFAULT;
11365
11366     player->special_action_bored = ACTION_DEFAULT;
11367     player->special_action_sleeping = ACTION_DEFAULT;
11368   }
11369 }
11370
11371 static void CheckSaveEngineSnapshot(struct PlayerInfo *player)
11372 {
11373   if ((!player->is_moving  && player->was_moving) ||
11374       (player->MovPos == 0 && player->was_moving) ||
11375       (player->is_snapping && !player->was_snapping) ||
11376       (player->is_dropping && !player->was_dropping))
11377   {
11378     if (!CheckSaveEngineSnapshotToList())
11379       return;
11380
11381     player->was_moving = FALSE;
11382     player->was_snapping = TRUE;
11383     player->was_dropping = TRUE;
11384   }
11385   else
11386   {
11387     if (player->is_moving)
11388       player->was_moving = TRUE;
11389
11390     if (!player->is_snapping)
11391       player->was_snapping = FALSE;
11392
11393     if (!player->is_dropping)
11394       player->was_dropping = FALSE;
11395   }
11396
11397   static struct MouseActionInfo mouse_action_last = { 0 };
11398   struct MouseActionInfo mouse_action = player->effective_mouse_action;
11399   boolean new_released = (!mouse_action.button && mouse_action_last.button);
11400
11401   if (new_released)
11402     CheckSaveEngineSnapshotToList();
11403
11404   mouse_action_last = mouse_action;
11405 }
11406
11407 static void CheckSingleStepMode(struct PlayerInfo *player)
11408 {
11409   if (tape.single_step && tape.recording && !tape.pausing)
11410   {
11411     // as it is called "single step mode", just return to pause mode when the
11412     // player stopped moving after one tile (or never starts moving at all)
11413     // (reverse logic needed here in case single step mode used in team mode)
11414     if (player->is_moving ||
11415         player->is_pushing ||
11416         player->is_dropping_pressed ||
11417         player->effective_mouse_action.button)
11418       game.enter_single_step_mode = FALSE;
11419   }
11420
11421   CheckSaveEngineSnapshot(player);
11422 }
11423
11424 static byte PlayerActions(struct PlayerInfo *player, byte player_action)
11425 {
11426   int left      = player_action & JOY_LEFT;
11427   int right     = player_action & JOY_RIGHT;
11428   int up        = player_action & JOY_UP;
11429   int down      = player_action & JOY_DOWN;
11430   int button1   = player_action & JOY_BUTTON_1;
11431   int button2   = player_action & JOY_BUTTON_2;
11432   int dx        = (left ? -1 : right ? 1 : 0);
11433   int dy        = (up   ? -1 : down  ? 1 : 0);
11434
11435   if (!player->active || tape.pausing)
11436     return 0;
11437
11438   if (player_action)
11439   {
11440     if (button1)
11441       SnapField(player, dx, dy);
11442     else
11443     {
11444       if (button2)
11445         DropElement(player);
11446
11447       MovePlayer(player, dx, dy);
11448     }
11449
11450     CheckSingleStepMode(player);
11451
11452     SetPlayerWaiting(player, FALSE);
11453
11454     return player_action;
11455   }
11456   else
11457   {
11458     // no actions for this player (no input at player's configured device)
11459
11460     DigField(player, 0, 0, 0, 0, 0, 0, DF_NO_PUSH);
11461     SnapField(player, 0, 0);
11462     CheckGravityMovementWhenNotMoving(player);
11463
11464     if (player->MovPos == 0)
11465       SetPlayerWaiting(player, TRUE);
11466
11467     if (player->MovPos == 0)    // needed for tape.playing
11468       player->is_moving = FALSE;
11469
11470     player->is_dropping = FALSE;
11471     player->is_dropping_pressed = FALSE;
11472     player->drop_pressed_delay = 0;
11473
11474     CheckSingleStepMode(player);
11475
11476     return 0;
11477   }
11478 }
11479
11480 static void SetMouseActionFromTapeAction(struct MouseActionInfo *mouse_action,
11481                                          byte *tape_action)
11482 {
11483   if (!tape.use_mouse_actions)
11484     return;
11485
11486   mouse_action->lx     = tape_action[TAPE_ACTION_LX];
11487   mouse_action->ly     = tape_action[TAPE_ACTION_LY];
11488   mouse_action->button = tape_action[TAPE_ACTION_BUTTON];
11489 }
11490
11491 static void SetTapeActionFromMouseAction(byte *tape_action,
11492                                          struct MouseActionInfo *mouse_action)
11493 {
11494   if (!tape.use_mouse_actions)
11495     return;
11496
11497   tape_action[TAPE_ACTION_LX]     = mouse_action->lx;
11498   tape_action[TAPE_ACTION_LY]     = mouse_action->ly;
11499   tape_action[TAPE_ACTION_BUTTON] = mouse_action->button;
11500 }
11501
11502 static void CheckLevelSolved(void)
11503 {
11504   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
11505   {
11506     if (game_em.level_solved &&
11507         !game_em.game_over)                             // game won
11508     {
11509       LevelSolved();
11510
11511       game_em.game_over = TRUE;
11512
11513       game.all_players_gone = TRUE;
11514     }
11515
11516     if (game_em.game_over)                              // game lost
11517       game.all_players_gone = TRUE;
11518   }
11519   else if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
11520   {
11521     if (game_sp.level_solved &&
11522         !game_sp.game_over)                             // game won
11523     {
11524       LevelSolved();
11525
11526       game_sp.game_over = TRUE;
11527
11528       game.all_players_gone = TRUE;
11529     }
11530
11531     if (game_sp.game_over)                              // game lost
11532       game.all_players_gone = TRUE;
11533   }
11534   else if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
11535   {
11536     if (game_mm.level_solved &&
11537         !game_mm.game_over)                             // game won
11538     {
11539       LevelSolved();
11540
11541       game_mm.game_over = TRUE;
11542
11543       game.all_players_gone = TRUE;
11544     }
11545
11546     if (game_mm.game_over)                              // game lost
11547       game.all_players_gone = TRUE;
11548   }
11549 }
11550
11551 static void CheckLevelTime(void)
11552 {
11553   int i;
11554
11555   if (TimeFrames >= FRAMES_PER_SECOND)
11556   {
11557     TimeFrames = 0;
11558     TapeTime++;
11559
11560     for (i = 0; i < MAX_PLAYERS; i++)
11561     {
11562       struct PlayerInfo *player = &stored_player[i];
11563
11564       if (SHIELD_ON(player))
11565       {
11566         player->shield_normal_time_left--;
11567
11568         if (player->shield_deadly_time_left > 0)
11569           player->shield_deadly_time_left--;
11570       }
11571     }
11572
11573     if (!game.LevelSolved && !level.use_step_counter)
11574     {
11575       TimePlayed++;
11576
11577       if (TimeLeft > 0)
11578       {
11579         TimeLeft--;
11580
11581         if (TimeLeft <= 10 && setup.time_limit)
11582           PlaySound(SND_GAME_RUNNING_OUT_OF_TIME);
11583
11584         /* this does not make sense: game_panel_controls[GAME_PANEL_TIME].value
11585            is reset from other values in UpdateGameDoorValues() -- FIX THIS */
11586
11587         game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
11588
11589         if (!TimeLeft && setup.time_limit)
11590         {
11591           if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
11592             game_em.lev->killed_out_of_time = TRUE;
11593           else
11594             for (i = 0; i < MAX_PLAYERS; i++)
11595               KillPlayer(&stored_player[i]);
11596         }
11597       }
11598       else if (game.no_time_limit && !game.all_players_gone)
11599       {
11600         game_panel_controls[GAME_PANEL_TIME].value = TimePlayed;
11601       }
11602
11603       game_em.lev->time = (game.no_time_limit ? TimePlayed : TimeLeft);
11604     }
11605
11606     if (tape.recording || tape.playing)
11607       DrawVideoDisplay(VIDEO_STATE_TIME_ON, TapeTime);
11608   }
11609
11610   if (tape.recording || tape.playing)
11611     DrawVideoDisplay(VIDEO_STATE_FRAME_ON, FrameCounter);
11612
11613   UpdateAndDisplayGameControlValues();
11614 }
11615
11616 void AdvanceFrameAndPlayerCounters(int player_nr)
11617 {
11618   int i;
11619
11620   // advance frame counters (global frame counter and time frame counter)
11621   FrameCounter++;
11622   TimeFrames++;
11623
11624   // advance player counters (counters for move delay, move animation etc.)
11625   for (i = 0; i < MAX_PLAYERS; i++)
11626   {
11627     boolean advance_player_counters = (player_nr == -1 || player_nr == i);
11628     int move_delay_value = stored_player[i].move_delay_value;
11629     int move_frames = MOVE_DELAY_NORMAL_SPEED / move_delay_value;
11630
11631     if (!advance_player_counters)       // not all players may be affected
11632       continue;
11633
11634     if (move_frames == 0)       // less than one move per game frame
11635     {
11636       int stepsize = TILEX / move_delay_value;
11637       int delay = move_delay_value / MOVE_DELAY_NORMAL_SPEED;
11638       int count = (stored_player[i].is_moving ?
11639                    ABS(stored_player[i].MovPos) / stepsize : FrameCounter);
11640
11641       if (count % delay == 0)
11642         move_frames = 1;
11643     }
11644
11645     stored_player[i].Frame += move_frames;
11646
11647     if (stored_player[i].MovPos != 0)
11648       stored_player[i].StepFrame += move_frames;
11649
11650     if (stored_player[i].move_delay > 0)
11651       stored_player[i].move_delay--;
11652
11653     // due to bugs in previous versions, counter must count up, not down
11654     if (stored_player[i].push_delay != -1)
11655       stored_player[i].push_delay++;
11656
11657     if (stored_player[i].drop_delay > 0)
11658       stored_player[i].drop_delay--;
11659
11660     if (stored_player[i].is_dropping_pressed)
11661       stored_player[i].drop_pressed_delay++;
11662   }
11663 }
11664
11665 void StartGameActions(boolean init_network_game, boolean record_tape,
11666                       int random_seed)
11667 {
11668   unsigned int new_random_seed = InitRND(random_seed);
11669
11670   if (record_tape)
11671     TapeStartRecording(new_random_seed);
11672
11673   if (init_network_game)
11674   {
11675     SendToServer_LevelFile();
11676     SendToServer_StartPlaying();
11677
11678     return;
11679   }
11680
11681   InitGame();
11682 }
11683
11684 static void GameActionsExt(void)
11685 {
11686 #if 0
11687   static unsigned int game_frame_delay = 0;
11688 #endif
11689   unsigned int game_frame_delay_value;
11690   byte *recorded_player_action;
11691   byte summarized_player_action = 0;
11692   byte tape_action[MAX_TAPE_ACTIONS] = { 0 };
11693   int i;
11694
11695   // detect endless loops, caused by custom element programming
11696   if (recursion_loop_detected && recursion_loop_depth == 0)
11697   {
11698     char *message = getStringCat3("Internal Error! Element ",
11699                                   EL_NAME(recursion_loop_element),
11700                                   " caused endless loop! Quit the game?");
11701
11702     Warn("element '%s' caused endless loop in game engine",
11703          EL_NAME(recursion_loop_element));
11704
11705     RequestQuitGameExt(FALSE, level_editor_test_game, message);
11706
11707     recursion_loop_detected = FALSE;    // if game should be continued
11708
11709     free(message);
11710
11711     return;
11712   }
11713
11714   if (game.restart_level)
11715     StartGameActions(network.enabled, setup.autorecord, level.random_seed);
11716
11717   CheckLevelSolved();
11718
11719   if (game.LevelSolved && !game.LevelSolved_GameEnd)
11720     GameWon();
11721
11722   if (game.all_players_gone && !TAPE_IS_STOPPED(tape))
11723     TapeStop();
11724
11725   if (game_status != GAME_MODE_PLAYING)         // status might have changed
11726     return;
11727
11728   game_frame_delay_value =
11729     (tape.playing && tape.fast_forward ? FfwdFrameDelay : GameFrameDelay);
11730
11731   if (tape.playing && tape.warp_forward && !tape.pausing)
11732     game_frame_delay_value = 0;
11733
11734   SetVideoFrameDelay(game_frame_delay_value);
11735
11736   // (de)activate virtual buttons depending on current game status
11737   if (strEqual(setup.touch.control_type, TOUCH_CONTROL_VIRTUAL_BUTTONS))
11738   {
11739     if (game.all_players_gone)  // if no players there to be controlled anymore
11740       SetOverlayActive(FALSE);
11741     else if (!tape.playing)     // if game continues after tape stopped playing
11742       SetOverlayActive(TRUE);
11743   }
11744
11745 #if 0
11746 #if 0
11747   // ---------- main game synchronization point ----------
11748
11749   int skip = WaitUntilDelayReached(&game_frame_delay, game_frame_delay_value);
11750
11751   Debug("game:playing:skip", "skip == %d", skip);
11752
11753 #else
11754   // ---------- main game synchronization point ----------
11755
11756   WaitUntilDelayReached(&game_frame_delay, game_frame_delay_value);
11757 #endif
11758 #endif
11759
11760   if (network_playing && !network_player_action_received)
11761   {
11762     // try to get network player actions in time
11763
11764     // last chance to get network player actions without main loop delay
11765     HandleNetworking();
11766
11767     // game was quit by network peer
11768     if (game_status != GAME_MODE_PLAYING)
11769       return;
11770
11771     // check if network player actions still missing and game still running
11772     if (!network_player_action_received && !checkGameEnded())
11773       return;           // failed to get network player actions in time
11774
11775     // do not yet reset "network_player_action_received" (for tape.pausing)
11776   }
11777
11778   if (tape.pausing)
11779     return;
11780
11781   // at this point we know that we really continue executing the game
11782
11783   network_player_action_received = FALSE;
11784
11785   // when playing tape, read previously recorded player input from tape data
11786   recorded_player_action = (tape.playing ? TapePlayAction() : NULL);
11787
11788   local_player->effective_mouse_action = local_player->mouse_action;
11789
11790   if (recorded_player_action != NULL)
11791     SetMouseActionFromTapeAction(&local_player->effective_mouse_action,
11792                                  recorded_player_action);
11793
11794   // TapePlayAction() may return NULL when toggling to "pause before death"
11795   if (tape.pausing)
11796     return;
11797
11798   if (tape.set_centered_player)
11799   {
11800     game.centered_player_nr_next = tape.centered_player_nr_next;
11801     game.set_centered_player = TRUE;
11802   }
11803
11804   for (i = 0; i < MAX_PLAYERS; i++)
11805   {
11806     summarized_player_action |= stored_player[i].action;
11807
11808     if (!network_playing && (game.team_mode || tape.playing))
11809       stored_player[i].effective_action = stored_player[i].action;
11810   }
11811
11812   if (network_playing && !checkGameEnded())
11813     SendToServer_MovePlayer(summarized_player_action);
11814
11815   // summarize all actions at local players mapped input device position
11816   // (this allows using different input devices in single player mode)
11817   if (!network.enabled && !game.team_mode)
11818     stored_player[map_player_action[local_player->index_nr]].effective_action =
11819       summarized_player_action;
11820
11821   // summarize all actions at centered player in local team mode
11822   if (tape.recording &&
11823       setup.team_mode && !network.enabled &&
11824       setup.input_on_focus &&
11825       game.centered_player_nr != -1)
11826   {
11827     for (i = 0; i < MAX_PLAYERS; i++)
11828       stored_player[map_player_action[i]].effective_action =
11829         (i == game.centered_player_nr ? summarized_player_action : 0);
11830   }
11831
11832   if (recorded_player_action != NULL)
11833     for (i = 0; i < MAX_PLAYERS; i++)
11834       stored_player[i].effective_action = recorded_player_action[i];
11835
11836   for (i = 0; i < MAX_PLAYERS; i++)
11837   {
11838     tape_action[i] = stored_player[i].effective_action;
11839
11840     /* (this may happen in the RND game engine if a player was not present on
11841        the playfield on level start, but appeared later from a custom element */
11842     if (setup.team_mode &&
11843         tape.recording &&
11844         tape_action[i] &&
11845         !tape.player_participates[i])
11846       tape.player_participates[i] = TRUE;
11847   }
11848
11849   SetTapeActionFromMouseAction(tape_action,
11850                                &local_player->effective_mouse_action);
11851
11852   // only record actions from input devices, but not programmed actions
11853   if (tape.recording)
11854     TapeRecordAction(tape_action);
11855
11856   // remember if game was played (especially after tape stopped playing)
11857   if (!tape.playing && summarized_player_action)
11858     game.GamePlayed = TRUE;
11859
11860 #if USE_NEW_PLAYER_ASSIGNMENTS
11861   // !!! also map player actions in single player mode !!!
11862   // if (game.team_mode)
11863   if (1)
11864   {
11865     byte mapped_action[MAX_PLAYERS];
11866
11867 #if DEBUG_PLAYER_ACTIONS
11868     for (i = 0; i < MAX_PLAYERS; i++)
11869       DebugContinued("", "%d, ", stored_player[i].effective_action);
11870 #endif
11871
11872     for (i = 0; i < MAX_PLAYERS; i++)
11873       mapped_action[i] = stored_player[map_player_action[i]].effective_action;
11874
11875     for (i = 0; i < MAX_PLAYERS; i++)
11876       stored_player[i].effective_action = mapped_action[i];
11877
11878 #if DEBUG_PLAYER_ACTIONS
11879     DebugContinued("", "=> ");
11880     for (i = 0; i < MAX_PLAYERS; i++)
11881       DebugContinued("", "%d, ", stored_player[i].effective_action);
11882     DebugContinued("game:playing:player", "\n");
11883 #endif
11884   }
11885 #if DEBUG_PLAYER_ACTIONS
11886   else
11887   {
11888     for (i = 0; i < MAX_PLAYERS; i++)
11889       DebugContinued("", "%d, ", stored_player[i].effective_action);
11890     DebugContinued("game:playing:player", "\n");
11891   }
11892 #endif
11893 #endif
11894
11895   for (i = 0; i < MAX_PLAYERS; i++)
11896   {
11897     // allow engine snapshot in case of changed movement attempt
11898     if ((game.snapshot.last_action[i] & KEY_MOTION) !=
11899         (stored_player[i].effective_action & KEY_MOTION))
11900       game.snapshot.changed_action = TRUE;
11901
11902     // allow engine snapshot in case of snapping/dropping attempt
11903     if ((game.snapshot.last_action[i] & KEY_BUTTON) == 0 &&
11904         (stored_player[i].effective_action & KEY_BUTTON) != 0)
11905       game.snapshot.changed_action = TRUE;
11906
11907     game.snapshot.last_action[i] = stored_player[i].effective_action;
11908   }
11909
11910   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
11911   {
11912     GameActions_EM_Main();
11913   }
11914   else if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
11915   {
11916     GameActions_SP_Main();
11917   }
11918   else if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
11919   {
11920     GameActions_MM_Main();
11921   }
11922   else
11923   {
11924     GameActions_RND_Main();
11925   }
11926
11927   BlitScreenToBitmap(backbuffer);
11928
11929   CheckLevelSolved();
11930   CheckLevelTime();
11931
11932   AdvanceFrameAndPlayerCounters(-1);    // advance counters for all players
11933
11934   if (global.show_frames_per_second)
11935   {
11936     static unsigned int fps_counter = 0;
11937     static int fps_frames = 0;
11938     unsigned int fps_delay_ms = Counter() - fps_counter;
11939
11940     fps_frames++;
11941
11942     if (fps_delay_ms >= 500)    // calculate FPS every 0.5 seconds
11943     {
11944       global.frames_per_second = 1000 * (float)fps_frames / fps_delay_ms;
11945
11946       fps_frames = 0;
11947       fps_counter = Counter();
11948
11949       // always draw FPS to screen after FPS value was updated
11950       redraw_mask |= REDRAW_FPS;
11951     }
11952
11953     // only draw FPS if no screen areas are deactivated (invisible warp mode)
11954     if (GetDrawDeactivationMask() == REDRAW_NONE)
11955       redraw_mask |= REDRAW_FPS;
11956   }
11957 }
11958
11959 static void GameActions_CheckSaveEngineSnapshot(void)
11960 {
11961   if (!game.snapshot.save_snapshot)
11962     return;
11963
11964   // clear flag for saving snapshot _before_ saving snapshot
11965   game.snapshot.save_snapshot = FALSE;
11966
11967   SaveEngineSnapshotToList();
11968 }
11969
11970 void GameActions(void)
11971 {
11972   GameActionsExt();
11973
11974   GameActions_CheckSaveEngineSnapshot();
11975 }
11976
11977 void GameActions_EM_Main(void)
11978 {
11979   byte effective_action[MAX_PLAYERS];
11980   boolean warp_mode = (tape.playing && tape.warp_forward && !tape.pausing);
11981   int i;
11982
11983   for (i = 0; i < MAX_PLAYERS; i++)
11984     effective_action[i] = stored_player[i].effective_action;
11985
11986   GameActions_EM(effective_action, warp_mode);
11987 }
11988
11989 void GameActions_SP_Main(void)
11990 {
11991   byte effective_action[MAX_PLAYERS];
11992   boolean warp_mode = (tape.playing && tape.warp_forward && !tape.pausing);
11993   int i;
11994
11995   for (i = 0; i < MAX_PLAYERS; i++)
11996     effective_action[i] = stored_player[i].effective_action;
11997
11998   GameActions_SP(effective_action, warp_mode);
11999
12000   for (i = 0; i < MAX_PLAYERS; i++)
12001   {
12002     if (stored_player[i].force_dropping)
12003       stored_player[i].action |= KEY_BUTTON_DROP;
12004
12005     stored_player[i].force_dropping = FALSE;
12006   }
12007 }
12008
12009 void GameActions_MM_Main(void)
12010 {
12011   boolean warp_mode = (tape.playing && tape.warp_forward && !tape.pausing);
12012
12013   GameActions_MM(local_player->effective_mouse_action, warp_mode);
12014 }
12015
12016 void GameActions_RND_Main(void)
12017 {
12018   GameActions_RND();
12019 }
12020
12021 void GameActions_RND(void)
12022 {
12023   static struct MouseActionInfo mouse_action_last = { 0 };
12024   struct MouseActionInfo mouse_action = local_player->effective_mouse_action;
12025   int magic_wall_x = 0, magic_wall_y = 0;
12026   int i, x, y, element, graphic, last_gfx_frame;
12027
12028   InitPlayfieldScanModeVars();
12029
12030   if (game.engine_version >= VERSION_IDENT(3,2,0,7))
12031   {
12032     SCAN_PLAYFIELD(x, y)
12033     {
12034       ChangeCount[x][y] = 0;
12035       ChangeEvent[x][y] = -1;
12036     }
12037   }
12038
12039   if (game.set_centered_player)
12040   {
12041     boolean all_players_fit_to_screen = checkIfAllPlayersFitToScreen_RND();
12042
12043     // switching to "all players" only possible if all players fit to screen
12044     if (game.centered_player_nr_next == -1 && !all_players_fit_to_screen)
12045     {
12046       game.centered_player_nr_next = game.centered_player_nr;
12047       game.set_centered_player = FALSE;
12048     }
12049
12050     // do not switch focus to non-existing (or non-active) player
12051     if (game.centered_player_nr_next >= 0 &&
12052         !stored_player[game.centered_player_nr_next].active)
12053     {
12054       game.centered_player_nr_next = game.centered_player_nr;
12055       game.set_centered_player = FALSE;
12056     }
12057   }
12058
12059   if (game.set_centered_player &&
12060       ScreenMovPos == 0)        // screen currently aligned at tile position
12061   {
12062     int sx, sy;
12063
12064     if (game.centered_player_nr_next == -1)
12065     {
12066       setScreenCenteredToAllPlayers(&sx, &sy);
12067     }
12068     else
12069     {
12070       sx = stored_player[game.centered_player_nr_next].jx;
12071       sy = stored_player[game.centered_player_nr_next].jy;
12072     }
12073
12074     game.centered_player_nr = game.centered_player_nr_next;
12075     game.set_centered_player = FALSE;
12076
12077     DrawRelocateScreen(0, 0, sx, sy, MV_NONE, TRUE, setup.quick_switch);
12078     DrawGameDoorValues();
12079   }
12080
12081   // check single step mode (set flag and clear again if any player is active)
12082   game.enter_single_step_mode =
12083     (tape.single_step && tape.recording && !tape.pausing);
12084
12085   for (i = 0; i < MAX_PLAYERS; i++)
12086   {
12087     int actual_player_action = stored_player[i].effective_action;
12088
12089 #if 1
12090     /* !!! THIS BREAKS THE FOLLOWING TAPES: !!!
12091        - rnd_equinox_tetrachloride 048
12092        - rnd_equinox_tetrachloride_ii 096
12093        - rnd_emanuel_schmieg 002
12094        - doctor_sloan_ww 001, 020
12095     */
12096     if (stored_player[i].MovPos == 0)
12097       CheckGravityMovement(&stored_player[i]);
12098 #endif
12099
12100     // overwrite programmed action with tape action
12101     if (stored_player[i].programmed_action)
12102       actual_player_action = stored_player[i].programmed_action;
12103
12104     PlayerActions(&stored_player[i], actual_player_action);
12105
12106     ScrollPlayer(&stored_player[i], SCROLL_GO_ON);
12107   }
12108
12109   // single step pause mode may already have been toggled by "ScrollPlayer()"
12110   if (game.enter_single_step_mode && !tape.pausing)
12111     TapeTogglePause(TAPE_TOGGLE_AUTOMATIC);
12112
12113   ScrollScreen(NULL, SCROLL_GO_ON);
12114
12115   /* for backwards compatibility, the following code emulates a fixed bug that
12116      occured when pushing elements (causing elements that just made their last
12117      pushing step to already (if possible) make their first falling step in the
12118      same game frame, which is bad); this code is also needed to use the famous
12119      "spring push bug" which is used in older levels and might be wanted to be
12120      used also in newer levels, but in this case the buggy pushing code is only
12121      affecting the "spring" element and no other elements */
12122
12123   if (game.engine_version < VERSION_IDENT(2,2,0,7) || level.use_spring_bug)
12124   {
12125     for (i = 0; i < MAX_PLAYERS; i++)
12126     {
12127       struct PlayerInfo *player = &stored_player[i];
12128       int x = player->jx;
12129       int y = player->jy;
12130
12131       if (player->active && player->is_pushing && player->is_moving &&
12132           IS_MOVING(x, y) &&
12133           (game.engine_version < VERSION_IDENT(2,2,0,7) ||
12134            Tile[x][y] == EL_SPRING))
12135       {
12136         ContinueMoving(x, y);
12137
12138         // continue moving after pushing (this is actually a bug)
12139         if (!IS_MOVING(x, y))
12140           Stop[x][y] = FALSE;
12141       }
12142     }
12143   }
12144
12145   SCAN_PLAYFIELD(x, y)
12146   {
12147     Last[x][y] = Tile[x][y];
12148
12149     ChangeCount[x][y] = 0;
12150     ChangeEvent[x][y] = -1;
12151
12152     // this must be handled before main playfield loop
12153     if (Tile[x][y] == EL_PLAYER_IS_LEAVING)
12154     {
12155       MovDelay[x][y]--;
12156       if (MovDelay[x][y] <= 0)
12157         RemoveField(x, y);
12158     }
12159
12160     if (Tile[x][y] == EL_ELEMENT_SNAPPING)
12161     {
12162       MovDelay[x][y]--;
12163       if (MovDelay[x][y] <= 0)
12164       {
12165         int element = Store[x][y];
12166         int move_direction = MovDir[x][y];
12167         int player_index_bit = Store2[x][y];
12168
12169         Store[x][y] = 0;
12170         Store2[x][y] = 0;
12171
12172         RemoveField(x, y);
12173         TEST_DrawLevelField(x, y);
12174
12175         TestFieldAfterSnapping(x, y, element, move_direction, player_index_bit);
12176       }
12177     }
12178
12179 #if DEBUG
12180     if (ChangePage[x][y] != -1 && ChangeDelay[x][y] != 1)
12181     {
12182       Debug("game:playing:GameActions_RND", "x = %d, y = %d: ChangePage != -1",
12183             x, y);
12184       Debug("game:playing:GameActions_RND", "This should never happen!");
12185
12186       ChangePage[x][y] = -1;
12187     }
12188 #endif
12189
12190     Stop[x][y] = FALSE;
12191     if (WasJustMoving[x][y] > 0)
12192       WasJustMoving[x][y]--;
12193     if (WasJustFalling[x][y] > 0)
12194       WasJustFalling[x][y]--;
12195     if (CheckCollision[x][y] > 0)
12196       CheckCollision[x][y]--;
12197     if (CheckImpact[x][y] > 0)
12198       CheckImpact[x][y]--;
12199
12200     GfxFrame[x][y]++;
12201
12202     /* reset finished pushing action (not done in ContinueMoving() to allow
12203        continuous pushing animation for elements with zero push delay) */
12204     if (GfxAction[x][y] == ACTION_PUSHING && !IS_MOVING(x, y))
12205     {
12206       ResetGfxAnimation(x, y);
12207       TEST_DrawLevelField(x, y);
12208     }
12209
12210 #if DEBUG
12211     if (IS_BLOCKED(x, y))
12212     {
12213       int oldx, oldy;
12214
12215       Blocked2Moving(x, y, &oldx, &oldy);
12216       if (!IS_MOVING(oldx, oldy))
12217       {
12218         Debug("game:playing:GameActions_RND", "(BLOCKED => MOVING) context corrupted!");
12219         Debug("game:playing:GameActions_RND", "BLOCKED: x = %d, y = %d", x, y);
12220         Debug("game:playing:GameActions_RND", "!MOVING: oldx = %d, oldy = %d", oldx, oldy);
12221         Debug("game:playing:GameActions_RND", "This should never happen!");
12222       }
12223     }
12224 #endif
12225   }
12226
12227   if (mouse_action.button)
12228   {
12229     int new_button = (mouse_action.button && mouse_action_last.button == 0);
12230     int ch_button = CH_SIDE_FROM_BUTTON(mouse_action.button);
12231
12232     x = mouse_action.lx;
12233     y = mouse_action.ly;
12234     element = Tile[x][y];
12235
12236     if (new_button)
12237     {
12238       CheckElementChangeByMouse(x, y, element, CE_CLICKED_BY_MOUSE, ch_button);
12239       CheckTriggeredElementChangeByMouse(x, y, element, CE_MOUSE_CLICKED_ON_X,
12240                                          ch_button);
12241     }
12242
12243     CheckElementChangeByMouse(x, y, element, CE_PRESSED_BY_MOUSE, ch_button);
12244     CheckTriggeredElementChangeByMouse(x, y, element, CE_MOUSE_PRESSED_ON_X,
12245                                        ch_button);
12246   }
12247
12248   SCAN_PLAYFIELD(x, y)
12249   {
12250     element = Tile[x][y];
12251     graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
12252     last_gfx_frame = GfxFrame[x][y];
12253
12254     ResetGfxFrame(x, y);
12255
12256     if (GfxFrame[x][y] != last_gfx_frame && !Stop[x][y])
12257       DrawLevelGraphicAnimation(x, y, graphic);
12258
12259     if (ANIM_MODE(graphic) == ANIM_RANDOM &&
12260         IS_NEXT_FRAME(GfxFrame[x][y], graphic))
12261       ResetRandomAnimationValue(x, y);
12262
12263     SetRandomAnimationValue(x, y);
12264
12265     PlayLevelSoundActionIfLoop(x, y, GfxAction[x][y]);
12266
12267     if (IS_INACTIVE(element))
12268     {
12269       if (IS_ANIMATED(graphic))
12270         DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
12271
12272       continue;
12273     }
12274
12275     // this may take place after moving, so 'element' may have changed
12276     if (IS_CHANGING(x, y) &&
12277         (game.engine_version < VERSION_IDENT(3,0,7,1) || !Stop[x][y]))
12278     {
12279       int page = element_info[element].event_page_nr[CE_DELAY];
12280
12281       HandleElementChange(x, y, page);
12282
12283       element = Tile[x][y];
12284       graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
12285     }
12286
12287     if (!IS_MOVING(x, y) && (CAN_FALL(element) || CAN_MOVE(element)))
12288     {
12289       StartMoving(x, y);
12290
12291       element = Tile[x][y];
12292       graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
12293
12294       if (IS_ANIMATED(graphic) &&
12295           !IS_MOVING(x, y) &&
12296           !Stop[x][y])
12297         DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
12298
12299       if (IS_GEM(element) || element == EL_SP_INFOTRON)
12300         TEST_DrawTwinkleOnField(x, y);
12301     }
12302     else if (element == EL_ACID)
12303     {
12304       if (!Stop[x][y])
12305         DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
12306     }
12307     else if ((element == EL_EXIT_OPEN ||
12308               element == EL_EM_EXIT_OPEN ||
12309               element == EL_SP_EXIT_OPEN ||
12310               element == EL_STEEL_EXIT_OPEN ||
12311               element == EL_EM_STEEL_EXIT_OPEN ||
12312               element == EL_SP_TERMINAL ||
12313               element == EL_SP_TERMINAL_ACTIVE ||
12314               element == EL_EXTRA_TIME ||
12315               element == EL_SHIELD_NORMAL ||
12316               element == EL_SHIELD_DEADLY) &&
12317              IS_ANIMATED(graphic))
12318       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
12319     else if (IS_MOVING(x, y))
12320       ContinueMoving(x, y);
12321     else if (IS_ACTIVE_BOMB(element))
12322       CheckDynamite(x, y);
12323     else if (element == EL_AMOEBA_GROWING)
12324       AmoebaGrowing(x, y);
12325     else if (element == EL_AMOEBA_SHRINKING)
12326       AmoebaShrinking(x, y);
12327
12328 #if !USE_NEW_AMOEBA_CODE
12329     else if (IS_AMOEBALIVE(element))
12330       AmoebaReproduce(x, y);
12331 #endif
12332
12333     else if (element == EL_GAME_OF_LIFE || element == EL_BIOMAZE)
12334       Life(x, y);
12335     else if (element == EL_EXIT_CLOSED)
12336       CheckExit(x, y);
12337     else if (element == EL_EM_EXIT_CLOSED)
12338       CheckExitEM(x, y);
12339     else if (element == EL_STEEL_EXIT_CLOSED)
12340       CheckExitSteel(x, y);
12341     else if (element == EL_EM_STEEL_EXIT_CLOSED)
12342       CheckExitSteelEM(x, y);
12343     else if (element == EL_SP_EXIT_CLOSED)
12344       CheckExitSP(x, y);
12345     else if (element == EL_EXPANDABLE_WALL_GROWING ||
12346              element == EL_EXPANDABLE_STEELWALL_GROWING)
12347       MauerWaechst(x, y);
12348     else if (element == EL_EXPANDABLE_WALL ||
12349              element == EL_EXPANDABLE_WALL_HORIZONTAL ||
12350              element == EL_EXPANDABLE_WALL_VERTICAL ||
12351              element == EL_EXPANDABLE_WALL_ANY ||
12352              element == EL_BD_EXPANDABLE_WALL)
12353       MauerAbleger(x, y);
12354     else if (element == EL_EXPANDABLE_STEELWALL_HORIZONTAL ||
12355              element == EL_EXPANDABLE_STEELWALL_VERTICAL ||
12356              element == EL_EXPANDABLE_STEELWALL_ANY)
12357       MauerAblegerStahl(x, y);
12358     else if (element == EL_FLAMES)
12359       CheckForDragon(x, y);
12360     else if (element == EL_EXPLOSION)
12361       ; // drawing of correct explosion animation is handled separately
12362     else if (element == EL_ELEMENT_SNAPPING ||
12363              element == EL_DIAGONAL_SHRINKING ||
12364              element == EL_DIAGONAL_GROWING)
12365     {
12366       graphic = el_act_dir2img(GfxElement[x][y], GfxAction[x][y],GfxDir[x][y]);
12367
12368       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
12369     }
12370     else if (IS_ANIMATED(graphic) && !IS_CHANGING(x, y))
12371       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
12372
12373     if (IS_BELT_ACTIVE(element))
12374       PlayLevelSoundAction(x, y, ACTION_ACTIVE);
12375
12376     if (game.magic_wall_active)
12377     {
12378       int jx = local_player->jx, jy = local_player->jy;
12379
12380       // play the element sound at the position nearest to the player
12381       if ((element == EL_MAGIC_WALL_FULL ||
12382            element == EL_MAGIC_WALL_ACTIVE ||
12383            element == EL_MAGIC_WALL_EMPTYING ||
12384            element == EL_BD_MAGIC_WALL_FULL ||
12385            element == EL_BD_MAGIC_WALL_ACTIVE ||
12386            element == EL_BD_MAGIC_WALL_EMPTYING ||
12387            element == EL_DC_MAGIC_WALL_FULL ||
12388            element == EL_DC_MAGIC_WALL_ACTIVE ||
12389            element == EL_DC_MAGIC_WALL_EMPTYING) &&
12390           ABS(x - jx) + ABS(y - jy) <
12391           ABS(magic_wall_x - jx) + ABS(magic_wall_y - jy))
12392       {
12393         magic_wall_x = x;
12394         magic_wall_y = y;
12395       }
12396     }
12397   }
12398
12399 #if USE_NEW_AMOEBA_CODE
12400   // new experimental amoeba growth stuff
12401   if (!(FrameCounter % 8))
12402   {
12403     static unsigned int random = 1684108901;
12404
12405     for (i = 0; i < level.amoeba_speed * 28 / 8; i++)
12406     {
12407       x = RND(lev_fieldx);
12408       y = RND(lev_fieldy);
12409       element = Tile[x][y];
12410
12411       if (!IS_PLAYER(x,y) &&
12412           (element == EL_EMPTY ||
12413            CAN_GROW_INTO(element) ||
12414            element == EL_QUICKSAND_EMPTY ||
12415            element == EL_QUICKSAND_FAST_EMPTY ||
12416            element == EL_ACID_SPLASH_LEFT ||
12417            element == EL_ACID_SPLASH_RIGHT))
12418       {
12419         if ((IN_LEV_FIELD(x, y-1) && Tile[x][y-1] == EL_AMOEBA_WET) ||
12420             (IN_LEV_FIELD(x-1, y) && Tile[x-1][y] == EL_AMOEBA_WET) ||
12421             (IN_LEV_FIELD(x+1, y) && Tile[x+1][y] == EL_AMOEBA_WET) ||
12422             (IN_LEV_FIELD(x, y+1) && Tile[x][y+1] == EL_AMOEBA_WET))
12423           Tile[x][y] = EL_AMOEBA_DROP;
12424       }
12425
12426       random = random * 129 + 1;
12427     }
12428   }
12429 #endif
12430
12431   game.explosions_delayed = FALSE;
12432
12433   SCAN_PLAYFIELD(x, y)
12434   {
12435     element = Tile[x][y];
12436
12437     if (ExplodeField[x][y])
12438       Explode(x, y, EX_PHASE_START, ExplodeField[x][y]);
12439     else if (element == EL_EXPLOSION)
12440       Explode(x, y, ExplodePhase[x][y], EX_TYPE_NORMAL);
12441
12442     ExplodeField[x][y] = EX_TYPE_NONE;
12443   }
12444
12445   game.explosions_delayed = TRUE;
12446
12447   if (game.magic_wall_active)
12448   {
12449     if (!(game.magic_wall_time_left % 4))
12450     {
12451       int element = Tile[magic_wall_x][magic_wall_y];
12452
12453       if (element == EL_BD_MAGIC_WALL_FULL ||
12454           element == EL_BD_MAGIC_WALL_ACTIVE ||
12455           element == EL_BD_MAGIC_WALL_EMPTYING)
12456         PlayLevelSound(magic_wall_x, magic_wall_y, SND_BD_MAGIC_WALL_ACTIVE);
12457       else if (element == EL_DC_MAGIC_WALL_FULL ||
12458                element == EL_DC_MAGIC_WALL_ACTIVE ||
12459                element == EL_DC_MAGIC_WALL_EMPTYING)
12460         PlayLevelSound(magic_wall_x, magic_wall_y, SND_DC_MAGIC_WALL_ACTIVE);
12461       else
12462         PlayLevelSound(magic_wall_x, magic_wall_y, SND_MAGIC_WALL_ACTIVE);
12463     }
12464
12465     if (game.magic_wall_time_left > 0)
12466     {
12467       game.magic_wall_time_left--;
12468
12469       if (!game.magic_wall_time_left)
12470       {
12471         SCAN_PLAYFIELD(x, y)
12472         {
12473           element = Tile[x][y];
12474
12475           if (element == EL_MAGIC_WALL_ACTIVE ||
12476               element == EL_MAGIC_WALL_FULL)
12477           {
12478             Tile[x][y] = EL_MAGIC_WALL_DEAD;
12479             TEST_DrawLevelField(x, y);
12480           }
12481           else if (element == EL_BD_MAGIC_WALL_ACTIVE ||
12482                    element == EL_BD_MAGIC_WALL_FULL)
12483           {
12484             Tile[x][y] = EL_BD_MAGIC_WALL_DEAD;
12485             TEST_DrawLevelField(x, y);
12486           }
12487           else if (element == EL_DC_MAGIC_WALL_ACTIVE ||
12488                    element == EL_DC_MAGIC_WALL_FULL)
12489           {
12490             Tile[x][y] = EL_DC_MAGIC_WALL_DEAD;
12491             TEST_DrawLevelField(x, y);
12492           }
12493         }
12494
12495         game.magic_wall_active = FALSE;
12496       }
12497     }
12498   }
12499
12500   if (game.light_time_left > 0)
12501   {
12502     game.light_time_left--;
12503
12504     if (game.light_time_left == 0)
12505       RedrawAllLightSwitchesAndInvisibleElements();
12506   }
12507
12508   if (game.timegate_time_left > 0)
12509   {
12510     game.timegate_time_left--;
12511
12512     if (game.timegate_time_left == 0)
12513       CloseAllOpenTimegates();
12514   }
12515
12516   if (game.lenses_time_left > 0)
12517   {
12518     game.lenses_time_left--;
12519
12520     if (game.lenses_time_left == 0)
12521       RedrawAllInvisibleElementsForLenses();
12522   }
12523
12524   if (game.magnify_time_left > 0)
12525   {
12526     game.magnify_time_left--;
12527
12528     if (game.magnify_time_left == 0)
12529       RedrawAllInvisibleElementsForMagnifier();
12530   }
12531
12532   for (i = 0; i < MAX_PLAYERS; i++)
12533   {
12534     struct PlayerInfo *player = &stored_player[i];
12535
12536     if (SHIELD_ON(player))
12537     {
12538       if (player->shield_deadly_time_left)
12539         PlayLevelSound(player->jx, player->jy, SND_SHIELD_DEADLY_ACTIVE);
12540       else if (player->shield_normal_time_left)
12541         PlayLevelSound(player->jx, player->jy, SND_SHIELD_NORMAL_ACTIVE);
12542     }
12543   }
12544
12545 #if USE_DELAYED_GFX_REDRAW
12546   SCAN_PLAYFIELD(x, y)
12547   {
12548     if (GfxRedraw[x][y] != GFX_REDRAW_NONE)
12549     {
12550       /* !!! PROBLEM: THIS REDRAWS THE PLAYFIELD _AFTER_ THE SCAN, BUT TILES
12551          !!! MAY HAVE CHANGED AFTER BEING DRAWN DURING PLAYFIELD SCAN !!! */
12552
12553       if (GfxRedraw[x][y] & GFX_REDRAW_TILE)
12554         DrawLevelField(x, y);
12555
12556       if (GfxRedraw[x][y] & GFX_REDRAW_TILE_CRUMBLED)
12557         DrawLevelFieldCrumbled(x, y);
12558
12559       if (GfxRedraw[x][y] & GFX_REDRAW_TILE_CRUMBLED_NEIGHBOURS)
12560         DrawLevelFieldCrumbledNeighbours(x, y);
12561
12562       if (GfxRedraw[x][y] & GFX_REDRAW_TILE_TWINKLED)
12563         DrawTwinkleOnField(x, y);
12564     }
12565
12566     GfxRedraw[x][y] = GFX_REDRAW_NONE;
12567   }
12568 #endif
12569
12570   DrawAllPlayers();
12571   PlayAllPlayersSound();
12572
12573   for (i = 0; i < MAX_PLAYERS; i++)
12574   {
12575     struct PlayerInfo *player = &stored_player[i];
12576
12577     if (player->show_envelope != 0 && (!player->active ||
12578                                        player->MovPos == 0))
12579     {
12580       ShowEnvelope(player->show_envelope - EL_ENVELOPE_1);
12581
12582       player->show_envelope = 0;
12583     }
12584   }
12585
12586   // use random number generator in every frame to make it less predictable
12587   if (game.engine_version >= VERSION_IDENT(3,1,1,0))
12588     RND(1);
12589
12590   mouse_action_last = mouse_action;
12591 }
12592
12593 static boolean AllPlayersInSight(struct PlayerInfo *player, int x, int y)
12594 {
12595   int min_x = x, min_y = y, max_x = x, max_y = y;
12596   int scr_fieldx = getScreenFieldSizeX();
12597   int scr_fieldy = getScreenFieldSizeY();
12598   int i;
12599
12600   for (i = 0; i < MAX_PLAYERS; i++)
12601   {
12602     int jx = stored_player[i].jx, jy = stored_player[i].jy;
12603
12604     if (!stored_player[i].active || &stored_player[i] == player)
12605       continue;
12606
12607     min_x = MIN(min_x, jx);
12608     min_y = MIN(min_y, jy);
12609     max_x = MAX(max_x, jx);
12610     max_y = MAX(max_y, jy);
12611   }
12612
12613   return (max_x - min_x < scr_fieldx && max_y - min_y < scr_fieldy);
12614 }
12615
12616 static boolean AllPlayersInVisibleScreen(void)
12617 {
12618   int i;
12619
12620   for (i = 0; i < MAX_PLAYERS; i++)
12621   {
12622     int jx = stored_player[i].jx, jy = stored_player[i].jy;
12623
12624     if (!stored_player[i].active)
12625       continue;
12626
12627     if (!IN_VIS_FIELD(SCREENX(jx), SCREENY(jy)))
12628       return FALSE;
12629   }
12630
12631   return TRUE;
12632 }
12633
12634 void ScrollLevel(int dx, int dy)
12635 {
12636   int scroll_offset = 2 * TILEX_VAR;
12637   int x, y;
12638
12639   BlitBitmap(drawto_field, drawto_field,
12640              FX + TILEX_VAR * (dx == -1) - scroll_offset,
12641              FY + TILEY_VAR * (dy == -1) - scroll_offset,
12642              SXSIZE - TILEX_VAR * (dx != 0) + 2 * scroll_offset,
12643              SYSIZE - TILEY_VAR * (dy != 0) + 2 * scroll_offset,
12644              FX + TILEX_VAR * (dx == 1) - scroll_offset,
12645              FY + TILEY_VAR * (dy == 1) - scroll_offset);
12646
12647   if (dx != 0)
12648   {
12649     x = (dx == 1 ? BX1 : BX2);
12650     for (y = BY1; y <= BY2; y++)
12651       DrawScreenField(x, y);
12652   }
12653
12654   if (dy != 0)
12655   {
12656     y = (dy == 1 ? BY1 : BY2);
12657     for (x = BX1; x <= BX2; x++)
12658       DrawScreenField(x, y);
12659   }
12660
12661   redraw_mask |= REDRAW_FIELD;
12662 }
12663
12664 static boolean canFallDown(struct PlayerInfo *player)
12665 {
12666   int jx = player->jx, jy = player->jy;
12667
12668   return (IN_LEV_FIELD(jx, jy + 1) &&
12669           (IS_FREE(jx, jy + 1) ||
12670            (Tile[jx][jy + 1] == EL_ACID && player->can_fall_into_acid)) &&
12671           IS_WALKABLE_FROM(Tile[jx][jy], MV_DOWN) &&
12672           !IS_WALKABLE_INSIDE(Tile[jx][jy]));
12673 }
12674
12675 static boolean canPassField(int x, int y, int move_dir)
12676 {
12677   int opposite_dir = MV_DIR_OPPOSITE(move_dir);
12678   int dx = (move_dir & MV_LEFT ? -1 : move_dir & MV_RIGHT ? +1 : 0);
12679   int dy = (move_dir & MV_UP   ? -1 : move_dir & MV_DOWN  ? +1 : 0);
12680   int nextx = x + dx;
12681   int nexty = y + dy;
12682   int element = Tile[x][y];
12683
12684   return (IS_PASSABLE_FROM(element, opposite_dir) &&
12685           !CAN_MOVE(element) &&
12686           IN_LEV_FIELD(nextx, nexty) && !IS_PLAYER(nextx, nexty) &&
12687           IS_WALKABLE_FROM(Tile[nextx][nexty], move_dir) &&
12688           (level.can_pass_to_walkable || IS_FREE(nextx, nexty)));
12689 }
12690
12691 static boolean canMoveToValidFieldWithGravity(int x, int y, int move_dir)
12692 {
12693   int opposite_dir = MV_DIR_OPPOSITE(move_dir);
12694   int dx = (move_dir & MV_LEFT ? -1 : move_dir & MV_RIGHT ? +1 : 0);
12695   int dy = (move_dir & MV_UP   ? -1 : move_dir & MV_DOWN  ? +1 : 0);
12696   int newx = x + dx;
12697   int newy = y + dy;
12698
12699   return (IN_LEV_FIELD(newx, newy) && !IS_FREE_OR_PLAYER(newx, newy) &&
12700           IS_GRAVITY_REACHABLE(Tile[newx][newy]) &&
12701           (IS_DIGGABLE(Tile[newx][newy]) ||
12702            IS_WALKABLE_FROM(Tile[newx][newy], opposite_dir) ||
12703            canPassField(newx, newy, move_dir)));
12704 }
12705
12706 static void CheckGravityMovement(struct PlayerInfo *player)
12707 {
12708   if (player->gravity && !player->programmed_action)
12709   {
12710     int move_dir_horizontal = player->effective_action & MV_HORIZONTAL;
12711     int move_dir_vertical   = player->effective_action & MV_VERTICAL;
12712     boolean player_is_snapping = (player->effective_action & JOY_BUTTON_1);
12713     int jx = player->jx, jy = player->jy;
12714     boolean player_is_moving_to_valid_field =
12715       (!player_is_snapping &&
12716        (canMoveToValidFieldWithGravity(jx, jy, move_dir_horizontal) ||
12717         canMoveToValidFieldWithGravity(jx, jy, move_dir_vertical)));
12718     boolean player_can_fall_down = canFallDown(player);
12719
12720     if (player_can_fall_down &&
12721         !player_is_moving_to_valid_field)
12722       player->programmed_action = MV_DOWN;
12723   }
12724 }
12725
12726 static void CheckGravityMovementWhenNotMoving(struct PlayerInfo *player)
12727 {
12728   return CheckGravityMovement(player);
12729
12730   if (player->gravity && !player->programmed_action)
12731   {
12732     int jx = player->jx, jy = player->jy;
12733     boolean field_under_player_is_free =
12734       (IN_LEV_FIELD(jx, jy + 1) && IS_FREE(jx, jy + 1));
12735     boolean player_is_standing_on_valid_field =
12736       (IS_WALKABLE_INSIDE(Tile[jx][jy]) ||
12737        (IS_WALKABLE(Tile[jx][jy]) &&
12738         !(element_info[Tile[jx][jy]].access_direction & MV_DOWN)));
12739
12740     if (field_under_player_is_free && !player_is_standing_on_valid_field)
12741       player->programmed_action = MV_DOWN;
12742   }
12743 }
12744
12745 /*
12746   MovePlayerOneStep()
12747   -----------------------------------------------------------------------------
12748   dx, dy:               direction (non-diagonal) to try to move the player to
12749   real_dx, real_dy:     direction as read from input device (can be diagonal)
12750 */
12751
12752 boolean MovePlayerOneStep(struct PlayerInfo *player,
12753                           int dx, int dy, int real_dx, int real_dy)
12754 {
12755   int jx = player->jx, jy = player->jy;
12756   int new_jx = jx + dx, new_jy = jy + dy;
12757   int can_move;
12758   boolean player_can_move = !player->cannot_move;
12759
12760   if (!player->active || (!dx && !dy))
12761     return MP_NO_ACTION;
12762
12763   player->MovDir = (dx < 0 ? MV_LEFT :
12764                     dx > 0 ? MV_RIGHT :
12765                     dy < 0 ? MV_UP :
12766                     dy > 0 ? MV_DOWN :  MV_NONE);
12767
12768   if (!IN_LEV_FIELD(new_jx, new_jy))
12769     return MP_NO_ACTION;
12770
12771   if (!player_can_move)
12772   {
12773     if (player->MovPos == 0)
12774     {
12775       player->is_moving = FALSE;
12776       player->is_digging = FALSE;
12777       player->is_collecting = FALSE;
12778       player->is_snapping = FALSE;
12779       player->is_pushing = FALSE;
12780     }
12781   }
12782
12783   if (!network.enabled && game.centered_player_nr == -1 &&
12784       !AllPlayersInSight(player, new_jx, new_jy))
12785     return MP_NO_ACTION;
12786
12787   can_move = DigField(player, jx, jy, new_jx, new_jy, real_dx,real_dy, DF_DIG);
12788   if (can_move != MP_MOVING)
12789     return can_move;
12790
12791   // check if DigField() has caused relocation of the player
12792   if (player->jx != jx || player->jy != jy)
12793     return MP_NO_ACTION;        // <-- !!! CHECK THIS [-> MP_ACTION ?] !!!
12794
12795   StorePlayer[jx][jy] = 0;
12796   player->last_jx = jx;
12797   player->last_jy = jy;
12798   player->jx = new_jx;
12799   player->jy = new_jy;
12800   StorePlayer[new_jx][new_jy] = player->element_nr;
12801
12802   if (player->move_delay_value_next != -1)
12803   {
12804     player->move_delay_value = player->move_delay_value_next;
12805     player->move_delay_value_next = -1;
12806   }
12807
12808   player->MovPos =
12809     (dx > 0 || dy > 0 ? -1 : 1) * (TILEX - TILEX / player->move_delay_value);
12810
12811   player->step_counter++;
12812
12813   PlayerVisit[jx][jy] = FrameCounter;
12814
12815   player->is_moving = TRUE;
12816
12817 #if 1
12818   // should better be called in MovePlayer(), but this breaks some tapes
12819   ScrollPlayer(player, SCROLL_INIT);
12820 #endif
12821
12822   return MP_MOVING;
12823 }
12824
12825 boolean MovePlayer(struct PlayerInfo *player, int dx, int dy)
12826 {
12827   int jx = player->jx, jy = player->jy;
12828   int old_jx = jx, old_jy = jy;
12829   int moved = MP_NO_ACTION;
12830
12831   if (!player->active)
12832     return FALSE;
12833
12834   if (!dx && !dy)
12835   {
12836     if (player->MovPos == 0)
12837     {
12838       player->is_moving = FALSE;
12839       player->is_digging = FALSE;
12840       player->is_collecting = FALSE;
12841       player->is_snapping = FALSE;
12842       player->is_pushing = FALSE;
12843     }
12844
12845     return FALSE;
12846   }
12847
12848   if (player->move_delay > 0)
12849     return FALSE;
12850
12851   player->move_delay = -1;              // set to "uninitialized" value
12852
12853   // store if player is automatically moved to next field
12854   player->is_auto_moving = (player->programmed_action != MV_NONE);
12855
12856   // remove the last programmed player action
12857   player->programmed_action = 0;
12858
12859   if (player->MovPos)
12860   {
12861     // should only happen if pre-1.2 tape recordings are played
12862     // this is only for backward compatibility
12863
12864     int original_move_delay_value = player->move_delay_value;
12865
12866 #if DEBUG
12867     Debug("game:playing:MovePlayer",
12868           "THIS SHOULD ONLY HAPPEN WITH PRE-1.2 LEVEL TAPES. [%d]",
12869           tape.counter);
12870 #endif
12871
12872     // scroll remaining steps with finest movement resolution
12873     player->move_delay_value = MOVE_DELAY_NORMAL_SPEED;
12874
12875     while (player->MovPos)
12876     {
12877       ScrollPlayer(player, SCROLL_GO_ON);
12878       ScrollScreen(NULL, SCROLL_GO_ON);
12879
12880       AdvanceFrameAndPlayerCounters(player->index_nr);
12881
12882       DrawAllPlayers();
12883       BackToFront_WithFrameDelay(0);
12884     }
12885
12886     player->move_delay_value = original_move_delay_value;
12887   }
12888
12889   player->is_active = FALSE;
12890
12891   if (player->last_move_dir & MV_HORIZONTAL)
12892   {
12893     if (!(moved |= MovePlayerOneStep(player, 0, dy, dx, dy)))
12894       moved |= MovePlayerOneStep(player, dx, 0, dx, dy);
12895   }
12896   else
12897   {
12898     if (!(moved |= MovePlayerOneStep(player, dx, 0, dx, dy)))
12899       moved |= MovePlayerOneStep(player, 0, dy, dx, dy);
12900   }
12901
12902   if (!moved && !player->is_active)
12903   {
12904     player->is_moving = FALSE;
12905     player->is_digging = FALSE;
12906     player->is_collecting = FALSE;
12907     player->is_snapping = FALSE;
12908     player->is_pushing = FALSE;
12909   }
12910
12911   jx = player->jx;
12912   jy = player->jy;
12913
12914   if (moved & MP_MOVING && !ScreenMovPos &&
12915       (player->index_nr == game.centered_player_nr ||
12916        game.centered_player_nr == -1))
12917   {
12918     int old_scroll_x = scroll_x, old_scroll_y = scroll_y;
12919
12920     if (!IN_VIS_FIELD(SCREENX(jx), SCREENY(jy)))
12921     {
12922       // actual player has left the screen -- scroll in that direction
12923       if (jx != old_jx)         // player has moved horizontally
12924         scroll_x += (jx - old_jx);
12925       else                      // player has moved vertically
12926         scroll_y += (jy - old_jy);
12927     }
12928     else
12929     {
12930       int offset_raw = game.scroll_delay_value;
12931
12932       if (jx != old_jx)         // player has moved horizontally
12933       {
12934         int offset = MIN(offset_raw, (SCR_FIELDX - 2) / 2);
12935         int offset_x = offset * (player->MovDir == MV_LEFT ? +1 : -1);
12936         int new_scroll_x = jx - MIDPOSX + offset_x;
12937
12938         if ((player->MovDir == MV_LEFT  && scroll_x > new_scroll_x) ||
12939             (player->MovDir == MV_RIGHT && scroll_x < new_scroll_x))
12940           scroll_x = new_scroll_x;
12941
12942         // don't scroll over playfield boundaries
12943         scroll_x = MIN(MAX(SBX_Left, scroll_x), SBX_Right);
12944
12945         // don't scroll more than one field at a time
12946         scroll_x = old_scroll_x + SIGN(scroll_x - old_scroll_x);
12947
12948         // don't scroll against the player's moving direction
12949         if ((player->MovDir == MV_LEFT  && scroll_x > old_scroll_x) ||
12950             (player->MovDir == MV_RIGHT && scroll_x < old_scroll_x))
12951           scroll_x = old_scroll_x;
12952       }
12953       else                      // player has moved vertically
12954       {
12955         int offset = MIN(offset_raw, (SCR_FIELDY - 2) / 2);
12956         int offset_y = offset * (player->MovDir == MV_UP ? +1 : -1);
12957         int new_scroll_y = jy - MIDPOSY + offset_y;
12958
12959         if ((player->MovDir == MV_UP   && scroll_y > new_scroll_y) ||
12960             (player->MovDir == MV_DOWN && scroll_y < new_scroll_y))
12961           scroll_y = new_scroll_y;
12962
12963         // don't scroll over playfield boundaries
12964         scroll_y = MIN(MAX(SBY_Upper, scroll_y), SBY_Lower);
12965
12966         // don't scroll more than one field at a time
12967         scroll_y = old_scroll_y + SIGN(scroll_y - old_scroll_y);
12968
12969         // don't scroll against the player's moving direction
12970         if ((player->MovDir == MV_UP   && scroll_y > old_scroll_y) ||
12971             (player->MovDir == MV_DOWN && scroll_y < old_scroll_y))
12972           scroll_y = old_scroll_y;
12973       }
12974     }
12975
12976     if (scroll_x != old_scroll_x || scroll_y != old_scroll_y)
12977     {
12978       if (!network.enabled && game.centered_player_nr == -1 &&
12979           !AllPlayersInVisibleScreen())
12980       {
12981         scroll_x = old_scroll_x;
12982         scroll_y = old_scroll_y;
12983       }
12984       else
12985       {
12986         ScrollScreen(player, SCROLL_INIT);
12987         ScrollLevel(old_scroll_x - scroll_x, old_scroll_y - scroll_y);
12988       }
12989     }
12990   }
12991
12992   player->StepFrame = 0;
12993
12994   if (moved & MP_MOVING)
12995   {
12996     if (old_jx != jx && old_jy == jy)
12997       player->MovDir = (old_jx < jx ? MV_RIGHT : MV_LEFT);
12998     else if (old_jx == jx && old_jy != jy)
12999       player->MovDir = (old_jy < jy ? MV_DOWN : MV_UP);
13000
13001     TEST_DrawLevelField(jx, jy);        // for "crumbled sand"
13002
13003     player->last_move_dir = player->MovDir;
13004     player->is_moving = TRUE;
13005     player->is_snapping = FALSE;
13006     player->is_switching = FALSE;
13007     player->is_dropping = FALSE;
13008     player->is_dropping_pressed = FALSE;
13009     player->drop_pressed_delay = 0;
13010
13011 #if 0
13012     // should better be called here than above, but this breaks some tapes
13013     ScrollPlayer(player, SCROLL_INIT);
13014 #endif
13015   }
13016   else
13017   {
13018     CheckGravityMovementWhenNotMoving(player);
13019
13020     player->is_moving = FALSE;
13021
13022     /* at this point, the player is allowed to move, but cannot move right now
13023        (e.g. because of something blocking the way) -- ensure that the player
13024        is also allowed to move in the next frame (in old versions before 3.1.1,
13025        the player was forced to wait again for eight frames before next try) */
13026
13027     if (game.engine_version >= VERSION_IDENT(3,1,1,0))
13028       player->move_delay = 0;   // allow direct movement in the next frame
13029   }
13030
13031   if (player->move_delay == -1)         // not yet initialized by DigField()
13032     player->move_delay = player->move_delay_value;
13033
13034   if (game.engine_version < VERSION_IDENT(3,0,7,0))
13035   {
13036     TestIfPlayerTouchesBadThing(jx, jy);
13037     TestIfPlayerTouchesCustomElement(jx, jy);
13038   }
13039
13040   if (!player->active)
13041     RemovePlayer(player);
13042
13043   return moved;
13044 }
13045
13046 void ScrollPlayer(struct PlayerInfo *player, int mode)
13047 {
13048   int jx = player->jx, jy = player->jy;
13049   int last_jx = player->last_jx, last_jy = player->last_jy;
13050   int move_stepsize = TILEX / player->move_delay_value;
13051
13052   if (!player->active)
13053     return;
13054
13055   if (player->MovPos == 0 && mode == SCROLL_GO_ON)      // player not moving
13056     return;
13057
13058   if (mode == SCROLL_INIT)
13059   {
13060     player->actual_frame_counter = FrameCounter;
13061     player->GfxPos = move_stepsize * (player->MovPos / move_stepsize);
13062
13063     if ((player->block_last_field || player->block_delay_adjustment > 0) &&
13064         Tile[last_jx][last_jy] == EL_EMPTY)
13065     {
13066       int last_field_block_delay = 0;   // start with no blocking at all
13067       int block_delay_adjustment = player->block_delay_adjustment;
13068
13069       // if player blocks last field, add delay for exactly one move
13070       if (player->block_last_field)
13071       {
13072         last_field_block_delay += player->move_delay_value;
13073
13074         // when blocking enabled, prevent moving up despite gravity
13075         if (player->gravity && player->MovDir == MV_UP)
13076           block_delay_adjustment = -1;
13077       }
13078
13079       // add block delay adjustment (also possible when not blocking)
13080       last_field_block_delay += block_delay_adjustment;
13081
13082       Tile[last_jx][last_jy] = EL_PLAYER_IS_LEAVING;
13083       MovDelay[last_jx][last_jy] = last_field_block_delay + 1;
13084     }
13085
13086     if (player->MovPos != 0)    // player has not yet reached destination
13087       return;
13088   }
13089   else if (!FrameReached(&player->actual_frame_counter, 1))
13090     return;
13091
13092   if (player->MovPos != 0)
13093   {
13094     player->MovPos += (player->MovPos > 0 ? -1 : 1) * move_stepsize;
13095     player->GfxPos = move_stepsize * (player->MovPos / move_stepsize);
13096
13097     // before DrawPlayer() to draw correct player graphic for this case
13098     if (player->MovPos == 0)
13099       CheckGravityMovement(player);
13100   }
13101
13102   if (player->MovPos == 0)      // player reached destination field
13103   {
13104     if (player->move_delay_reset_counter > 0)
13105     {
13106       player->move_delay_reset_counter--;
13107
13108       if (player->move_delay_reset_counter == 0)
13109       {
13110         // continue with normal speed after quickly moving through gate
13111         HALVE_PLAYER_SPEED(player);
13112
13113         // be able to make the next move without delay
13114         player->move_delay = 0;
13115       }
13116     }
13117
13118     player->last_jx = jx;
13119     player->last_jy = jy;
13120
13121     if (Tile[jx][jy] == EL_EXIT_OPEN ||
13122         Tile[jx][jy] == EL_EM_EXIT_OPEN ||
13123         Tile[jx][jy] == EL_EM_EXIT_OPENING ||
13124         Tile[jx][jy] == EL_STEEL_EXIT_OPEN ||
13125         Tile[jx][jy] == EL_EM_STEEL_EXIT_OPEN ||
13126         Tile[jx][jy] == EL_EM_STEEL_EXIT_OPENING ||
13127         Tile[jx][jy] == EL_SP_EXIT_OPEN ||
13128         Tile[jx][jy] == EL_SP_EXIT_OPENING)     // <-- special case
13129     {
13130       ExitPlayer(player);
13131
13132       if (game.players_still_needed == 0 &&
13133           (game.friends_still_needed == 0 ||
13134            IS_SP_ELEMENT(Tile[jx][jy])))
13135         LevelSolved();
13136     }
13137
13138     // this breaks one level: "machine", level 000
13139     {
13140       int move_direction = player->MovDir;
13141       int enter_side = MV_DIR_OPPOSITE(move_direction);
13142       int leave_side = move_direction;
13143       int old_jx = last_jx;
13144       int old_jy = last_jy;
13145       int old_element = Tile[old_jx][old_jy];
13146       int new_element = Tile[jx][jy];
13147
13148       if (IS_CUSTOM_ELEMENT(old_element))
13149         CheckElementChangeByPlayer(old_jx, old_jy, old_element,
13150                                    CE_LEFT_BY_PLAYER,
13151                                    player->index_bit, leave_side);
13152
13153       CheckTriggeredElementChangeByPlayer(old_jx, old_jy, old_element,
13154                                           CE_PLAYER_LEAVES_X,
13155                                           player->index_bit, leave_side);
13156
13157       if (IS_CUSTOM_ELEMENT(new_element))
13158         CheckElementChangeByPlayer(jx, jy, new_element, CE_ENTERED_BY_PLAYER,
13159                                    player->index_bit, enter_side);
13160
13161       CheckTriggeredElementChangeByPlayer(jx, jy, new_element,
13162                                           CE_PLAYER_ENTERS_X,
13163                                           player->index_bit, enter_side);
13164
13165       CheckTriggeredElementChangeBySide(jx, jy, player->initial_element,
13166                                         CE_MOVE_OF_X, move_direction);
13167     }
13168
13169     if (game.engine_version >= VERSION_IDENT(3,0,7,0))
13170     {
13171       TestIfPlayerTouchesBadThing(jx, jy);
13172       TestIfPlayerTouchesCustomElement(jx, jy);
13173
13174       /* needed because pushed element has not yet reached its destination,
13175          so it would trigger a change event at its previous field location */
13176       if (!player->is_pushing)
13177         TestIfElementTouchesCustomElement(jx, jy);      // for empty space
13178
13179       if (level.finish_dig_collect &&
13180           (player->is_digging || player->is_collecting))
13181       {
13182         int last_element = player->last_removed_element;
13183         int move_direction = player->MovDir;
13184         int enter_side = MV_DIR_OPPOSITE(move_direction);
13185         int change_event = (player->is_digging ? CE_PLAYER_DIGS_X :
13186                             CE_PLAYER_COLLECTS_X);
13187
13188         CheckTriggeredElementChangeByPlayer(jx, jy, last_element, change_event,
13189                                             player->index_bit, enter_side);
13190
13191         player->last_removed_element = EL_UNDEFINED;
13192       }
13193
13194       if (!player->active)
13195         RemovePlayer(player);
13196     }
13197
13198     if (level.use_step_counter)
13199     {
13200       int i;
13201
13202       TimePlayed++;
13203
13204       if (TimeLeft > 0)
13205       {
13206         TimeLeft--;
13207
13208         if (TimeLeft <= 10 && setup.time_limit && !game.LevelSolved)
13209           PlaySound(SND_GAME_RUNNING_OUT_OF_TIME);
13210
13211         game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
13212
13213         DisplayGameControlValues();
13214
13215         if (!TimeLeft && setup.time_limit && !game.LevelSolved)
13216           for (i = 0; i < MAX_PLAYERS; i++)
13217             KillPlayer(&stored_player[i]);
13218       }
13219       else if (game.no_time_limit && !game.all_players_gone)
13220       {
13221         game_panel_controls[GAME_PANEL_TIME].value = TimePlayed;
13222
13223         DisplayGameControlValues();
13224       }
13225     }
13226
13227     if (tape.single_step && tape.recording && !tape.pausing &&
13228         !player->programmed_action)
13229       TapeTogglePause(TAPE_TOGGLE_AUTOMATIC);
13230
13231     if (!player->programmed_action)
13232       CheckSaveEngineSnapshot(player);
13233   }
13234 }
13235
13236 void ScrollScreen(struct PlayerInfo *player, int mode)
13237 {
13238   static unsigned int screen_frame_counter = 0;
13239
13240   if (mode == SCROLL_INIT)
13241   {
13242     // set scrolling step size according to actual player's moving speed
13243     ScrollStepSize = TILEX / player->move_delay_value;
13244
13245     screen_frame_counter = FrameCounter;
13246     ScreenMovDir = player->MovDir;
13247     ScreenMovPos = player->MovPos;
13248     ScreenGfxPos = ScrollStepSize * (ScreenMovPos / ScrollStepSize);
13249     return;
13250   }
13251   else if (!FrameReached(&screen_frame_counter, 1))
13252     return;
13253
13254   if (ScreenMovPos)
13255   {
13256     ScreenMovPos += (ScreenMovPos > 0 ? -1 : 1) * ScrollStepSize;
13257     ScreenGfxPos = ScrollStepSize * (ScreenMovPos / ScrollStepSize);
13258     redraw_mask |= REDRAW_FIELD;
13259   }
13260   else
13261     ScreenMovDir = MV_NONE;
13262 }
13263
13264 void TestIfPlayerTouchesCustomElement(int x, int y)
13265 {
13266   static int xy[4][2] =
13267   {
13268     { 0, -1 },
13269     { -1, 0 },
13270     { +1, 0 },
13271     { 0, +1 }
13272   };
13273   static int trigger_sides[4][2] =
13274   {
13275     // center side       border side
13276     { CH_SIDE_TOP,      CH_SIDE_BOTTOM  },      // check top
13277     { CH_SIDE_LEFT,     CH_SIDE_RIGHT   },      // check left
13278     { CH_SIDE_RIGHT,    CH_SIDE_LEFT    },      // check right
13279     { CH_SIDE_BOTTOM,   CH_SIDE_TOP     }       // check bottom
13280   };
13281   static int touch_dir[4] =
13282   {
13283     MV_LEFT | MV_RIGHT,
13284     MV_UP   | MV_DOWN,
13285     MV_UP   | MV_DOWN,
13286     MV_LEFT | MV_RIGHT
13287   };
13288   int center_element = Tile[x][y];      // should always be non-moving!
13289   int i;
13290
13291   for (i = 0; i < NUM_DIRECTIONS; i++)
13292   {
13293     int xx = x + xy[i][0];
13294     int yy = y + xy[i][1];
13295     int center_side = trigger_sides[i][0];
13296     int border_side = trigger_sides[i][1];
13297     int border_element;
13298
13299     if (!IN_LEV_FIELD(xx, yy))
13300       continue;
13301
13302     if (IS_PLAYER(x, y))                // player found at center element
13303     {
13304       struct PlayerInfo *player = PLAYERINFO(x, y);
13305
13306       if (game.engine_version < VERSION_IDENT(3,0,7,0))
13307         border_element = Tile[xx][yy];          // may be moving!
13308       else if (!IS_MOVING(xx, yy) && !IS_BLOCKED(xx, yy))
13309         border_element = Tile[xx][yy];
13310       else if (MovDir[xx][yy] & touch_dir[i])   // elements are touching
13311         border_element = MovingOrBlocked2Element(xx, yy);
13312       else
13313         continue;               // center and border element do not touch
13314
13315       CheckElementChangeByPlayer(xx, yy, border_element, CE_TOUCHED_BY_PLAYER,
13316                                  player->index_bit, border_side);
13317       CheckTriggeredElementChangeByPlayer(xx, yy, border_element,
13318                                           CE_PLAYER_TOUCHES_X,
13319                                           player->index_bit, border_side);
13320
13321       {
13322         /* use player element that is initially defined in the level playfield,
13323            not the player element that corresponds to the runtime player number
13324            (example: a level that contains EL_PLAYER_3 as the only player would
13325            incorrectly give EL_PLAYER_1 for "player->element_nr") */
13326         int player_element = PLAYERINFO(x, y)->initial_element;
13327
13328         CheckElementChangeBySide(xx, yy, border_element, player_element,
13329                                  CE_TOUCHING_X, border_side);
13330       }
13331     }
13332     else if (IS_PLAYER(xx, yy))         // player found at border element
13333     {
13334       struct PlayerInfo *player = PLAYERINFO(xx, yy);
13335
13336       if (game.engine_version >= VERSION_IDENT(3,0,7,0))
13337       {
13338         if (player->MovPos != 0 && !(player->MovDir & touch_dir[i]))
13339           continue;             // center and border element do not touch
13340       }
13341
13342       CheckElementChangeByPlayer(x, y, center_element, CE_TOUCHED_BY_PLAYER,
13343                                  player->index_bit, center_side);
13344       CheckTriggeredElementChangeByPlayer(x, y, center_element,
13345                                           CE_PLAYER_TOUCHES_X,
13346                                           player->index_bit, center_side);
13347
13348       {
13349         /* use player element that is initially defined in the level playfield,
13350            not the player element that corresponds to the runtime player number
13351            (example: a level that contains EL_PLAYER_3 as the only player would
13352            incorrectly give EL_PLAYER_1 for "player->element_nr") */
13353         int player_element = PLAYERINFO(xx, yy)->initial_element;
13354
13355         CheckElementChangeBySide(x, y, center_element, player_element,
13356                                  CE_TOUCHING_X, center_side);
13357       }
13358
13359       break;
13360     }
13361   }
13362 }
13363
13364 void TestIfElementTouchesCustomElement(int x, int y)
13365 {
13366   static int xy[4][2] =
13367   {
13368     { 0, -1 },
13369     { -1, 0 },
13370     { +1, 0 },
13371     { 0, +1 }
13372   };
13373   static int trigger_sides[4][2] =
13374   {
13375     // center side      border side
13376     { CH_SIDE_TOP,      CH_SIDE_BOTTOM  },      // check top
13377     { CH_SIDE_LEFT,     CH_SIDE_RIGHT   },      // check left
13378     { CH_SIDE_RIGHT,    CH_SIDE_LEFT    },      // check right
13379     { CH_SIDE_BOTTOM,   CH_SIDE_TOP     }       // check bottom
13380   };
13381   static int touch_dir[4] =
13382   {
13383     MV_LEFT | MV_RIGHT,
13384     MV_UP   | MV_DOWN,
13385     MV_UP   | MV_DOWN,
13386     MV_LEFT | MV_RIGHT
13387   };
13388   boolean change_center_element = FALSE;
13389   int center_element = Tile[x][y];      // should always be non-moving!
13390   int border_element_old[NUM_DIRECTIONS];
13391   int i;
13392
13393   for (i = 0; i < NUM_DIRECTIONS; i++)
13394   {
13395     int xx = x + xy[i][0];
13396     int yy = y + xy[i][1];
13397     int border_element;
13398
13399     border_element_old[i] = -1;
13400
13401     if (!IN_LEV_FIELD(xx, yy))
13402       continue;
13403
13404     if (game.engine_version < VERSION_IDENT(3,0,7,0))
13405       border_element = Tile[xx][yy];    // may be moving!
13406     else if (!IS_MOVING(xx, yy) && !IS_BLOCKED(xx, yy))
13407       border_element = Tile[xx][yy];
13408     else if (MovDir[xx][yy] & touch_dir[i])     // elements are touching
13409       border_element = MovingOrBlocked2Element(xx, yy);
13410     else
13411       continue;                 // center and border element do not touch
13412
13413     border_element_old[i] = border_element;
13414   }
13415
13416   for (i = 0; i < NUM_DIRECTIONS; i++)
13417   {
13418     int xx = x + xy[i][0];
13419     int yy = y + xy[i][1];
13420     int center_side = trigger_sides[i][0];
13421     int border_element = border_element_old[i];
13422
13423     if (border_element == -1)
13424       continue;
13425
13426     // check for change of border element
13427     CheckElementChangeBySide(xx, yy, border_element, center_element,
13428                              CE_TOUCHING_X, center_side);
13429
13430     // (center element cannot be player, so we dont have to check this here)
13431   }
13432
13433   for (i = 0; i < NUM_DIRECTIONS; i++)
13434   {
13435     int xx = x + xy[i][0];
13436     int yy = y + xy[i][1];
13437     int border_side = trigger_sides[i][1];
13438     int border_element = border_element_old[i];
13439
13440     if (border_element == -1)
13441       continue;
13442
13443     // check for change of center element (but change it only once)
13444     if (!change_center_element)
13445       change_center_element =
13446         CheckElementChangeBySide(x, y, center_element, border_element,
13447                                  CE_TOUCHING_X, border_side);
13448
13449     if (IS_PLAYER(xx, yy))
13450     {
13451       /* use player element that is initially defined in the level playfield,
13452          not the player element that corresponds to the runtime player number
13453          (example: a level that contains EL_PLAYER_3 as the only player would
13454          incorrectly give EL_PLAYER_1 for "player->element_nr") */
13455       int player_element = PLAYERINFO(xx, yy)->initial_element;
13456
13457       CheckElementChangeBySide(x, y, center_element, player_element,
13458                                CE_TOUCHING_X, border_side);
13459     }
13460   }
13461 }
13462
13463 void TestIfElementHitsCustomElement(int x, int y, int direction)
13464 {
13465   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
13466   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
13467   int hitx = x + dx, hity = y + dy;
13468   int hitting_element = Tile[x][y];
13469   int touched_element;
13470
13471   if (IN_LEV_FIELD(hitx, hity) && IS_FREE(hitx, hity))
13472     return;
13473
13474   touched_element = (IN_LEV_FIELD(hitx, hity) ?
13475                      MovingOrBlocked2Element(hitx, hity) : EL_STEELWALL);
13476
13477   if (IN_LEV_FIELD(hitx, hity))
13478   {
13479     int opposite_direction = MV_DIR_OPPOSITE(direction);
13480     int hitting_side = direction;
13481     int touched_side = opposite_direction;
13482     boolean object_hit = (!IS_MOVING(hitx, hity) ||
13483                           MovDir[hitx][hity] != direction ||
13484                           ABS(MovPos[hitx][hity]) <= TILEY / 2);
13485
13486     object_hit = TRUE;
13487
13488     if (object_hit)
13489     {
13490       CheckElementChangeBySide(x, y, hitting_element, touched_element,
13491                                CE_HITTING_X, touched_side);
13492
13493       CheckElementChangeBySide(hitx, hity, touched_element, hitting_element,
13494                                CE_HIT_BY_X, hitting_side);
13495
13496       CheckElementChangeBySide(hitx, hity, touched_element, hitting_element,
13497                                CE_HIT_BY_SOMETHING, opposite_direction);
13498
13499       if (IS_PLAYER(hitx, hity))
13500       {
13501         /* use player element that is initially defined in the level playfield,
13502            not the player element that corresponds to the runtime player number
13503            (example: a level that contains EL_PLAYER_3 as the only player would
13504            incorrectly give EL_PLAYER_1 for "player->element_nr") */
13505         int player_element = PLAYERINFO(hitx, hity)->initial_element;
13506
13507         CheckElementChangeBySide(x, y, hitting_element, player_element,
13508                                  CE_HITTING_X, touched_side);
13509       }
13510     }
13511   }
13512
13513   // "hitting something" is also true when hitting the playfield border
13514   CheckElementChangeBySide(x, y, hitting_element, touched_element,
13515                            CE_HITTING_SOMETHING, direction);
13516 }
13517
13518 void TestIfGoodThingHitsBadThing(int good_x, int good_y, int good_move_dir)
13519 {
13520   int i, kill_x = -1, kill_y = -1;
13521
13522   int bad_element = -1;
13523   static int test_xy[4][2] =
13524   {
13525     { 0, -1 },
13526     { -1, 0 },
13527     { +1, 0 },
13528     { 0, +1 }
13529   };
13530   static int test_dir[4] =
13531   {
13532     MV_UP,
13533     MV_LEFT,
13534     MV_RIGHT,
13535     MV_DOWN
13536   };
13537
13538   for (i = 0; i < NUM_DIRECTIONS; i++)
13539   {
13540     int test_x, test_y, test_move_dir, test_element;
13541
13542     test_x = good_x + test_xy[i][0];
13543     test_y = good_y + test_xy[i][1];
13544
13545     if (!IN_LEV_FIELD(test_x, test_y))
13546       continue;
13547
13548     test_move_dir =
13549       (IS_MOVING(test_x, test_y) ? MovDir[test_x][test_y] : MV_NONE);
13550
13551     test_element = MovingOrBlocked2ElementIfNotLeaving(test_x, test_y);
13552
13553     /* 1st case: good thing is moving towards DONT_RUN_INTO style bad thing;
13554        2nd case: DONT_TOUCH style bad thing does not move away from good thing
13555     */
13556     if ((DONT_RUN_INTO(test_element) && good_move_dir == test_dir[i]) ||
13557         (DONT_TOUCH(test_element)    && test_move_dir != test_dir[i]))
13558     {
13559       kill_x = test_x;
13560       kill_y = test_y;
13561       bad_element = test_element;
13562
13563       break;
13564     }
13565   }
13566
13567   if (kill_x != -1 || kill_y != -1)
13568   {
13569     if (IS_PLAYER(good_x, good_y))
13570     {
13571       struct PlayerInfo *player = PLAYERINFO(good_x, good_y);
13572
13573       if (player->shield_deadly_time_left > 0 &&
13574           !IS_INDESTRUCTIBLE(bad_element))
13575         Bang(kill_x, kill_y);
13576       else if (!PLAYER_ENEMY_PROTECTED(good_x, good_y))
13577         KillPlayer(player);
13578     }
13579     else
13580       Bang(good_x, good_y);
13581   }
13582 }
13583
13584 void TestIfBadThingHitsGoodThing(int bad_x, int bad_y, int bad_move_dir)
13585 {
13586   int i, kill_x = -1, kill_y = -1;
13587   int bad_element = Tile[bad_x][bad_y];
13588   static int test_xy[4][2] =
13589   {
13590     { 0, -1 },
13591     { -1, 0 },
13592     { +1, 0 },
13593     { 0, +1 }
13594   };
13595   static int touch_dir[4] =
13596   {
13597     MV_LEFT | MV_RIGHT,
13598     MV_UP   | MV_DOWN,
13599     MV_UP   | MV_DOWN,
13600     MV_LEFT | MV_RIGHT
13601   };
13602   static int test_dir[4] =
13603   {
13604     MV_UP,
13605     MV_LEFT,
13606     MV_RIGHT,
13607     MV_DOWN
13608   };
13609
13610   if (bad_element == EL_EXPLOSION)      // skip just exploding bad things
13611     return;
13612
13613   for (i = 0; i < NUM_DIRECTIONS; i++)
13614   {
13615     int test_x, test_y, test_move_dir, test_element;
13616
13617     test_x = bad_x + test_xy[i][0];
13618     test_y = bad_y + test_xy[i][1];
13619
13620     if (!IN_LEV_FIELD(test_x, test_y))
13621       continue;
13622
13623     test_move_dir =
13624       (IS_MOVING(test_x, test_y) ? MovDir[test_x][test_y] : MV_NONE);
13625
13626     test_element = Tile[test_x][test_y];
13627
13628     /* 1st case: good thing is moving towards DONT_RUN_INTO style bad thing;
13629        2nd case: DONT_TOUCH style bad thing does not move away from good thing
13630     */
13631     if ((DONT_RUN_INTO(bad_element) &&  bad_move_dir == test_dir[i]) ||
13632         (DONT_TOUCH(bad_element)    && test_move_dir != test_dir[i]))
13633     {
13634       // good thing is player or penguin that does not move away
13635       if (IS_PLAYER(test_x, test_y))
13636       {
13637         struct PlayerInfo *player = PLAYERINFO(test_x, test_y);
13638
13639         if (bad_element == EL_ROBOT && player->is_moving)
13640           continue;     // robot does not kill player if he is moving
13641
13642         if (game.engine_version >= VERSION_IDENT(3,0,7,0))
13643         {
13644           if (player->MovPos != 0 && !(player->MovDir & touch_dir[i]))
13645             continue;           // center and border element do not touch
13646         }
13647
13648         kill_x = test_x;
13649         kill_y = test_y;
13650
13651         break;
13652       }
13653       else if (test_element == EL_PENGUIN)
13654       {
13655         kill_x = test_x;
13656         kill_y = test_y;
13657
13658         break;
13659       }
13660     }
13661   }
13662
13663   if (kill_x != -1 || kill_y != -1)
13664   {
13665     if (IS_PLAYER(kill_x, kill_y))
13666     {
13667       struct PlayerInfo *player = PLAYERINFO(kill_x, kill_y);
13668
13669       if (player->shield_deadly_time_left > 0 &&
13670           !IS_INDESTRUCTIBLE(bad_element))
13671         Bang(bad_x, bad_y);
13672       else if (!PLAYER_ENEMY_PROTECTED(kill_x, kill_y))
13673         KillPlayer(player);
13674     }
13675     else
13676       Bang(kill_x, kill_y);
13677   }
13678 }
13679
13680 void TestIfGoodThingGetsHitByBadThing(int bad_x, int bad_y, int bad_move_dir)
13681 {
13682   int bad_element = Tile[bad_x][bad_y];
13683   int dx = (bad_move_dir == MV_LEFT ? -1 : bad_move_dir == MV_RIGHT ? +1 : 0);
13684   int dy = (bad_move_dir == MV_UP   ? -1 : bad_move_dir == MV_DOWN  ? +1 : 0);
13685   int test_x = bad_x + dx, test_y = bad_y + dy;
13686   int test_move_dir, test_element;
13687   int kill_x = -1, kill_y = -1;
13688
13689   if (!IN_LEV_FIELD(test_x, test_y))
13690     return;
13691
13692   test_move_dir =
13693     (IS_MOVING(test_x, test_y) ? MovDir[test_x][test_y] : MV_NONE);
13694
13695   test_element = Tile[test_x][test_y];
13696
13697   if (test_move_dir != bad_move_dir)
13698   {
13699     // good thing can be player or penguin that does not move away
13700     if (IS_PLAYER(test_x, test_y))
13701     {
13702       struct PlayerInfo *player = PLAYERINFO(test_x, test_y);
13703
13704       /* (note: in comparison to DONT_RUN_TO and DONT_TOUCH, also handle the
13705          player as being hit when he is moving towards the bad thing, because
13706          the "get hit by" condition would be lost after the player stops) */
13707       if (player->MovPos != 0 && player->MovDir == bad_move_dir)
13708         return;         // player moves away from bad thing
13709
13710       kill_x = test_x;
13711       kill_y = test_y;
13712     }
13713     else if (test_element == EL_PENGUIN)
13714     {
13715       kill_x = test_x;
13716       kill_y = test_y;
13717     }
13718   }
13719
13720   if (kill_x != -1 || kill_y != -1)
13721   {
13722     if (IS_PLAYER(kill_x, kill_y))
13723     {
13724       struct PlayerInfo *player = PLAYERINFO(kill_x, kill_y);
13725
13726       if (player->shield_deadly_time_left > 0 &&
13727           !IS_INDESTRUCTIBLE(bad_element))
13728         Bang(bad_x, bad_y);
13729       else if (!PLAYER_ENEMY_PROTECTED(kill_x, kill_y))
13730         KillPlayer(player);
13731     }
13732     else
13733       Bang(kill_x, kill_y);
13734   }
13735 }
13736
13737 void TestIfPlayerTouchesBadThing(int x, int y)
13738 {
13739   TestIfGoodThingHitsBadThing(x, y, MV_NONE);
13740 }
13741
13742 void TestIfPlayerRunsIntoBadThing(int x, int y, int move_dir)
13743 {
13744   TestIfGoodThingHitsBadThing(x, y, move_dir);
13745 }
13746
13747 void TestIfBadThingTouchesPlayer(int x, int y)
13748 {
13749   TestIfBadThingHitsGoodThing(x, y, MV_NONE);
13750 }
13751
13752 void TestIfBadThingRunsIntoPlayer(int x, int y, int move_dir)
13753 {
13754   TestIfBadThingHitsGoodThing(x, y, move_dir);
13755 }
13756
13757 void TestIfFriendTouchesBadThing(int x, int y)
13758 {
13759   TestIfGoodThingHitsBadThing(x, y, MV_NONE);
13760 }
13761
13762 void TestIfBadThingTouchesFriend(int x, int y)
13763 {
13764   TestIfBadThingHitsGoodThing(x, y, MV_NONE);
13765 }
13766
13767 void TestIfBadThingTouchesOtherBadThing(int bad_x, int bad_y)
13768 {
13769   int i, kill_x = bad_x, kill_y = bad_y;
13770   static int xy[4][2] =
13771   {
13772     { 0, -1 },
13773     { -1, 0 },
13774     { +1, 0 },
13775     { 0, +1 }
13776   };
13777
13778   for (i = 0; i < NUM_DIRECTIONS; i++)
13779   {
13780     int x, y, element;
13781
13782     x = bad_x + xy[i][0];
13783     y = bad_y + xy[i][1];
13784     if (!IN_LEV_FIELD(x, y))
13785       continue;
13786
13787     element = Tile[x][y];
13788     if (IS_AMOEBOID(element) || element == EL_GAME_OF_LIFE ||
13789         element == EL_AMOEBA_GROWING || element == EL_AMOEBA_DROP)
13790     {
13791       kill_x = x;
13792       kill_y = y;
13793       break;
13794     }
13795   }
13796
13797   if (kill_x != bad_x || kill_y != bad_y)
13798     Bang(bad_x, bad_y);
13799 }
13800
13801 void KillPlayer(struct PlayerInfo *player)
13802 {
13803   int jx = player->jx, jy = player->jy;
13804
13805   if (!player->active)
13806     return;
13807
13808 #if 0
13809   Debug("game:playing:KillPlayer",
13810         "0: killed == %d, active == %d, reanimated == %d",
13811         player->killed, player->active, player->reanimated);
13812 #endif
13813
13814   /* the following code was introduced to prevent an infinite loop when calling
13815      -> Bang()
13816      -> CheckTriggeredElementChangeExt()
13817      -> ExecuteCustomElementAction()
13818      -> KillPlayer()
13819      -> (infinitely repeating the above sequence of function calls)
13820      which occurs when killing the player while having a CE with the setting
13821      "kill player X when explosion of <player X>"; the solution using a new
13822      field "player->killed" was chosen for backwards compatibility, although
13823      clever use of the fields "player->active" etc. would probably also work */
13824 #if 1
13825   if (player->killed)
13826     return;
13827 #endif
13828
13829   player->killed = TRUE;
13830
13831   // remove accessible field at the player's position
13832   Tile[jx][jy] = EL_EMPTY;
13833
13834   // deactivate shield (else Bang()/Explode() would not work right)
13835   player->shield_normal_time_left = 0;
13836   player->shield_deadly_time_left = 0;
13837
13838 #if 0
13839   Debug("game:playing:KillPlayer",
13840         "1: killed == %d, active == %d, reanimated == %d",
13841         player->killed, player->active, player->reanimated);
13842 #endif
13843
13844   Bang(jx, jy);
13845
13846 #if 0
13847   Debug("game:playing:KillPlayer",
13848         "2: killed == %d, active == %d, reanimated == %d",
13849         player->killed, player->active, player->reanimated);
13850 #endif
13851
13852   if (player->reanimated)       // killed player may have been reanimated
13853     player->killed = player->reanimated = FALSE;
13854   else
13855     BuryPlayer(player);
13856 }
13857
13858 static void KillPlayerUnlessEnemyProtected(int x, int y)
13859 {
13860   if (!PLAYER_ENEMY_PROTECTED(x, y))
13861     KillPlayer(PLAYERINFO(x, y));
13862 }
13863
13864 static void KillPlayerUnlessExplosionProtected(int x, int y)
13865 {
13866   if (!PLAYER_EXPLOSION_PROTECTED(x, y))
13867     KillPlayer(PLAYERINFO(x, y));
13868 }
13869
13870 void BuryPlayer(struct PlayerInfo *player)
13871 {
13872   int jx = player->jx, jy = player->jy;
13873
13874   if (!player->active)
13875     return;
13876
13877   PlayLevelSoundElementAction(jx, jy, player->artwork_element, ACTION_DYING);
13878   PlayLevelSound(jx, jy, SND_GAME_LOSING);
13879
13880   RemovePlayer(player);
13881
13882   player->buried = TRUE;
13883
13884   if (game.all_players_gone)
13885     game.GameOver = TRUE;
13886 }
13887
13888 void RemovePlayer(struct PlayerInfo *player)
13889 {
13890   int jx = player->jx, jy = player->jy;
13891   int i, found = FALSE;
13892
13893   player->present = FALSE;
13894   player->active = FALSE;
13895
13896   // required for some CE actions (even if the player is not active anymore)
13897   player->MovPos = 0;
13898
13899   if (!ExplodeField[jx][jy])
13900     StorePlayer[jx][jy] = 0;
13901
13902   if (player->is_moving)
13903     TEST_DrawLevelField(player->last_jx, player->last_jy);
13904
13905   for (i = 0; i < MAX_PLAYERS; i++)
13906     if (stored_player[i].active)
13907       found = TRUE;
13908
13909   if (!found)
13910   {
13911     game.all_players_gone = TRUE;
13912     game.GameOver = TRUE;
13913   }
13914
13915   game.exit_x = game.robot_wheel_x = jx;
13916   game.exit_y = game.robot_wheel_y = jy;
13917 }
13918
13919 void ExitPlayer(struct PlayerInfo *player)
13920 {
13921   DrawPlayer(player);   // needed here only to cleanup last field
13922   RemovePlayer(player);
13923
13924   if (game.players_still_needed > 0)
13925     game.players_still_needed--;
13926 }
13927
13928 static void SetFieldForSnapping(int x, int y, int element, int direction,
13929                                 int player_index_bit)
13930 {
13931   struct ElementInfo *ei = &element_info[element];
13932   int direction_bit = MV_DIR_TO_BIT(direction);
13933   int graphic_snapping = ei->direction_graphic[ACTION_SNAPPING][direction_bit];
13934   int action = (graphic_snapping != IMG_EMPTY_SPACE ? ACTION_SNAPPING :
13935                 IS_DIGGABLE(element) ? ACTION_DIGGING : ACTION_COLLECTING);
13936
13937   Tile[x][y] = EL_ELEMENT_SNAPPING;
13938   MovDelay[x][y] = MOVE_DELAY_NORMAL_SPEED + 1 - 1;
13939   MovDir[x][y] = direction;
13940   Store[x][y] = element;
13941   Store2[x][y] = player_index_bit;
13942
13943   ResetGfxAnimation(x, y);
13944
13945   GfxElement[x][y] = element;
13946   GfxAction[x][y] = action;
13947   GfxDir[x][y] = direction;
13948   GfxFrame[x][y] = -1;
13949 }
13950
13951 static void TestFieldAfterSnapping(int x, int y, int element, int direction,
13952                                    int player_index_bit)
13953 {
13954   TestIfElementTouchesCustomElement(x, y);      // for empty space
13955
13956   if (level.finish_dig_collect)
13957   {
13958     int dig_side = MV_DIR_OPPOSITE(direction);
13959
13960     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SNAPS_X,
13961                                         player_index_bit, dig_side);
13962   }
13963 }
13964
13965 /*
13966   =============================================================================
13967   checkDiagonalPushing()
13968   -----------------------------------------------------------------------------
13969   check if diagonal input device direction results in pushing of object
13970   (by checking if the alternative direction is walkable, diggable, ...)
13971   =============================================================================
13972 */
13973
13974 static boolean checkDiagonalPushing(struct PlayerInfo *player,
13975                                     int x, int y, int real_dx, int real_dy)
13976 {
13977   int jx, jy, dx, dy, xx, yy;
13978
13979   if (real_dx == 0 || real_dy == 0)     // no diagonal direction => push
13980     return TRUE;
13981
13982   // diagonal direction: check alternative direction
13983   jx = player->jx;
13984   jy = player->jy;
13985   dx = x - jx;
13986   dy = y - jy;
13987   xx = jx + (dx == 0 ? real_dx : 0);
13988   yy = jy + (dy == 0 ? real_dy : 0);
13989
13990   return (!IN_LEV_FIELD(xx, yy) || IS_SOLID_FOR_PUSHING(Tile[xx][yy]));
13991 }
13992
13993 /*
13994   =============================================================================
13995   DigField()
13996   -----------------------------------------------------------------------------
13997   x, y:                 field next to player (non-diagonal) to try to dig to
13998   real_dx, real_dy:     direction as read from input device (can be diagonal)
13999   =============================================================================
14000 */
14001
14002 static int DigField(struct PlayerInfo *player,
14003                     int oldx, int oldy, int x, int y,
14004                     int real_dx, int real_dy, int mode)
14005 {
14006   boolean is_player = (IS_PLAYER(oldx, oldy) || mode != DF_DIG);
14007   boolean player_was_pushing = player->is_pushing;
14008   boolean player_can_move = (!player->cannot_move && mode != DF_SNAP);
14009   boolean player_can_move_or_snap = (!player->cannot_move || mode == DF_SNAP);
14010   int jx = oldx, jy = oldy;
14011   int dx = x - jx, dy = y - jy;
14012   int nextx = x + dx, nexty = y + dy;
14013   int move_direction = (dx == -1 ? MV_LEFT  :
14014                         dx == +1 ? MV_RIGHT :
14015                         dy == -1 ? MV_UP    :
14016                         dy == +1 ? MV_DOWN  : MV_NONE);
14017   int opposite_direction = MV_DIR_OPPOSITE(move_direction);
14018   int dig_side = MV_DIR_OPPOSITE(move_direction);
14019   int old_element = Tile[jx][jy];
14020   int element = MovingOrBlocked2ElementIfNotLeaving(x, y);
14021   int collect_count;
14022
14023   if (is_player)                // function can also be called by EL_PENGUIN
14024   {
14025     if (player->MovPos == 0)
14026     {
14027       player->is_digging = FALSE;
14028       player->is_collecting = FALSE;
14029     }
14030
14031     if (player->MovPos == 0)    // last pushing move finished
14032       player->is_pushing = FALSE;
14033
14034     if (mode == DF_NO_PUSH)     // player just stopped pushing
14035     {
14036       player->is_switching = FALSE;
14037       player->push_delay = -1;
14038
14039       return MP_NO_ACTION;
14040     }
14041   }
14042
14043   if (IS_TUBE(Back[jx][jy]) && game.engine_version >= VERSION_IDENT(2,2,0,0))
14044     old_element = Back[jx][jy];
14045
14046   // in case of element dropped at player position, check background
14047   else if (Back[jx][jy] != EL_EMPTY &&
14048            game.engine_version >= VERSION_IDENT(2,2,0,0))
14049     old_element = Back[jx][jy];
14050
14051   if (IS_WALKABLE(old_element) && !ACCESS_FROM(old_element, move_direction))
14052     return MP_NO_ACTION;        // field has no opening in this direction
14053
14054   if (IS_PASSABLE(old_element) && !ACCESS_FROM(old_element,opposite_direction))
14055     return MP_NO_ACTION;        // field has no opening in this direction
14056
14057   if (player_can_move && element == EL_ACID && move_direction == MV_DOWN)
14058   {
14059     SplashAcid(x, y);
14060
14061     Tile[jx][jy] = player->artwork_element;
14062     InitMovingField(jx, jy, MV_DOWN);
14063     Store[jx][jy] = EL_ACID;
14064     ContinueMoving(jx, jy);
14065     BuryPlayer(player);
14066
14067     return MP_DONT_RUN_INTO;
14068   }
14069
14070   if (player_can_move && DONT_RUN_INTO(element))
14071   {
14072     TestIfPlayerRunsIntoBadThing(jx, jy, player->MovDir);
14073
14074     return MP_DONT_RUN_INTO;
14075   }
14076
14077   if (IS_MOVING(x, y) || IS_PLAYER(x, y))
14078     return MP_NO_ACTION;
14079
14080   collect_count = element_info[element].collect_count_initial;
14081
14082   if (!is_player && !IS_COLLECTIBLE(element))   // penguin cannot collect it
14083     return MP_NO_ACTION;
14084
14085   if (game.engine_version < VERSION_IDENT(2,2,0,0))
14086     player_can_move = player_can_move_or_snap;
14087
14088   if (mode == DF_SNAP && !IS_SNAPPABLE(element) &&
14089       game.engine_version >= VERSION_IDENT(2,2,0,0))
14090   {
14091     CheckElementChangeByPlayer(x, y, element, CE_SNAPPED_BY_PLAYER,
14092                                player->index_bit, dig_side);
14093     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SNAPS_X,
14094                                         player->index_bit, dig_side);
14095
14096     if (element == EL_DC_LANDMINE)
14097       Bang(x, y);
14098
14099     if (Tile[x][y] != element)          // field changed by snapping
14100       return MP_ACTION;
14101
14102     return MP_NO_ACTION;
14103   }
14104
14105   if (player->gravity && is_player && !player->is_auto_moving &&
14106       canFallDown(player) && move_direction != MV_DOWN &&
14107       !canMoveToValidFieldWithGravity(jx, jy, move_direction))
14108     return MP_NO_ACTION;        // player cannot walk here due to gravity
14109
14110   if (player_can_move &&
14111       IS_WALKABLE(element) && ACCESS_FROM(element, opposite_direction))
14112   {
14113     int sound_element = SND_ELEMENT(element);
14114     int sound_action = ACTION_WALKING;
14115
14116     if (IS_RND_GATE(element))
14117     {
14118       if (!player->key[RND_GATE_NR(element)])
14119         return MP_NO_ACTION;
14120     }
14121     else if (IS_RND_GATE_GRAY(element))
14122     {
14123       if (!player->key[RND_GATE_GRAY_NR(element)])
14124         return MP_NO_ACTION;
14125     }
14126     else if (IS_RND_GATE_GRAY_ACTIVE(element))
14127     {
14128       if (!player->key[RND_GATE_GRAY_ACTIVE_NR(element)])
14129         return MP_NO_ACTION;
14130     }
14131     else if (element == EL_EXIT_OPEN ||
14132              element == EL_EM_EXIT_OPEN ||
14133              element == EL_EM_EXIT_OPENING ||
14134              element == EL_STEEL_EXIT_OPEN ||
14135              element == EL_EM_STEEL_EXIT_OPEN ||
14136              element == EL_EM_STEEL_EXIT_OPENING ||
14137              element == EL_SP_EXIT_OPEN ||
14138              element == EL_SP_EXIT_OPENING)
14139     {
14140       sound_action = ACTION_PASSING;    // player is passing exit
14141     }
14142     else if (element == EL_EMPTY)
14143     {
14144       sound_action = ACTION_MOVING;             // nothing to walk on
14145     }
14146
14147     // play sound from background or player, whatever is available
14148     if (element_info[sound_element].sound[sound_action] != SND_UNDEFINED)
14149       PlayLevelSoundElementAction(x, y, sound_element, sound_action);
14150     else
14151       PlayLevelSoundElementAction(x, y, player->artwork_element, sound_action);
14152   }
14153   else if (player_can_move &&
14154            IS_PASSABLE(element) && canPassField(x, y, move_direction))
14155   {
14156     if (!ACCESS_FROM(element, opposite_direction))
14157       return MP_NO_ACTION;      // field not accessible from this direction
14158
14159     if (CAN_MOVE(element))      // only fixed elements can be passed!
14160       return MP_NO_ACTION;
14161
14162     if (IS_EM_GATE(element))
14163     {
14164       if (!player->key[EM_GATE_NR(element)])
14165         return MP_NO_ACTION;
14166     }
14167     else if (IS_EM_GATE_GRAY(element))
14168     {
14169       if (!player->key[EM_GATE_GRAY_NR(element)])
14170         return MP_NO_ACTION;
14171     }
14172     else if (IS_EM_GATE_GRAY_ACTIVE(element))
14173     {
14174       if (!player->key[EM_GATE_GRAY_ACTIVE_NR(element)])
14175         return MP_NO_ACTION;
14176     }
14177     else if (IS_EMC_GATE(element))
14178     {
14179       if (!player->key[EMC_GATE_NR(element)])
14180         return MP_NO_ACTION;
14181     }
14182     else if (IS_EMC_GATE_GRAY(element))
14183     {
14184       if (!player->key[EMC_GATE_GRAY_NR(element)])
14185         return MP_NO_ACTION;
14186     }
14187     else if (IS_EMC_GATE_GRAY_ACTIVE(element))
14188     {
14189       if (!player->key[EMC_GATE_GRAY_ACTIVE_NR(element)])
14190         return MP_NO_ACTION;
14191     }
14192     else if (element == EL_DC_GATE_WHITE ||
14193              element == EL_DC_GATE_WHITE_GRAY ||
14194              element == EL_DC_GATE_WHITE_GRAY_ACTIVE)
14195     {
14196       if (player->num_white_keys == 0)
14197         return MP_NO_ACTION;
14198
14199       player->num_white_keys--;
14200     }
14201     else if (IS_SP_PORT(element))
14202     {
14203       if (element == EL_SP_GRAVITY_PORT_LEFT ||
14204           element == EL_SP_GRAVITY_PORT_RIGHT ||
14205           element == EL_SP_GRAVITY_PORT_UP ||
14206           element == EL_SP_GRAVITY_PORT_DOWN)
14207         player->gravity = !player->gravity;
14208       else if (element == EL_SP_GRAVITY_ON_PORT_LEFT ||
14209                element == EL_SP_GRAVITY_ON_PORT_RIGHT ||
14210                element == EL_SP_GRAVITY_ON_PORT_UP ||
14211                element == EL_SP_GRAVITY_ON_PORT_DOWN)
14212         player->gravity = TRUE;
14213       else if (element == EL_SP_GRAVITY_OFF_PORT_LEFT ||
14214                element == EL_SP_GRAVITY_OFF_PORT_RIGHT ||
14215                element == EL_SP_GRAVITY_OFF_PORT_UP ||
14216                element == EL_SP_GRAVITY_OFF_PORT_DOWN)
14217         player->gravity = FALSE;
14218     }
14219
14220     // automatically move to the next field with double speed
14221     player->programmed_action = move_direction;
14222
14223     if (player->move_delay_reset_counter == 0)
14224     {
14225       player->move_delay_reset_counter = 2;     // two double speed steps
14226
14227       DOUBLE_PLAYER_SPEED(player);
14228     }
14229
14230     PlayLevelSoundAction(x, y, ACTION_PASSING);
14231   }
14232   else if (player_can_move_or_snap && IS_DIGGABLE(element))
14233   {
14234     RemoveField(x, y);
14235
14236     if (mode != DF_SNAP)
14237     {
14238       GfxElement[x][y] = GFX_ELEMENT(element);
14239       player->is_digging = TRUE;
14240     }
14241
14242     PlayLevelSoundElementAction(x, y, element, ACTION_DIGGING);
14243
14244     // use old behaviour for old levels (digging)
14245     if (!level.finish_dig_collect)
14246     {
14247       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_DIGS_X,
14248                                           player->index_bit, dig_side);
14249
14250       // if digging triggered player relocation, finish digging tile
14251       if (mode == DF_DIG && (player->jx != jx || player->jy != jy))
14252         SetFieldForSnapping(x, y, element, move_direction, player->index_bit);
14253     }
14254
14255     if (mode == DF_SNAP)
14256     {
14257       if (level.block_snap_field)
14258         SetFieldForSnapping(x, y, element, move_direction, player->index_bit);
14259       else
14260         TestFieldAfterSnapping(x, y, element, move_direction, player->index_bit);
14261
14262       // use old behaviour for old levels (snapping)
14263       if (!level.finish_dig_collect)
14264         CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SNAPS_X,
14265                                             player->index_bit, dig_side);
14266     }
14267   }
14268   else if (player_can_move_or_snap && IS_COLLECTIBLE(element))
14269   {
14270     RemoveField(x, y);
14271
14272     if (is_player && mode != DF_SNAP)
14273     {
14274       GfxElement[x][y] = element;
14275       player->is_collecting = TRUE;
14276     }
14277
14278     if (element == EL_SPEED_PILL)
14279     {
14280       player->move_delay_value = MOVE_DELAY_HIGH_SPEED;
14281     }
14282     else if (element == EL_EXTRA_TIME && level.time > 0)
14283     {
14284       TimeLeft += level.extra_time;
14285
14286       game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
14287
14288       DisplayGameControlValues();
14289     }
14290     else if (element == EL_SHIELD_NORMAL || element == EL_SHIELD_DEADLY)
14291     {
14292       player->shield_normal_time_left += level.shield_normal_time;
14293       if (element == EL_SHIELD_DEADLY)
14294         player->shield_deadly_time_left += level.shield_deadly_time;
14295     }
14296     else if (element == EL_DYNAMITE ||
14297              element == EL_EM_DYNAMITE ||
14298              element == EL_SP_DISK_RED)
14299     {
14300       if (player->inventory_size < MAX_INVENTORY_SIZE)
14301         player->inventory_element[player->inventory_size++] = element;
14302
14303       DrawGameDoorValues();
14304     }
14305     else if (element == EL_DYNABOMB_INCREASE_NUMBER)
14306     {
14307       player->dynabomb_count++;
14308       player->dynabombs_left++;
14309     }
14310     else if (element == EL_DYNABOMB_INCREASE_SIZE)
14311     {
14312       player->dynabomb_size++;
14313     }
14314     else if (element == EL_DYNABOMB_INCREASE_POWER)
14315     {
14316       player->dynabomb_xl = TRUE;
14317     }
14318     else if (IS_KEY(element))
14319     {
14320       player->key[KEY_NR(element)] = TRUE;
14321
14322       DrawGameDoorValues();
14323     }
14324     else if (element == EL_DC_KEY_WHITE)
14325     {
14326       player->num_white_keys++;
14327
14328       // display white keys?
14329       // DrawGameDoorValues();
14330     }
14331     else if (IS_ENVELOPE(element))
14332     {
14333       player->show_envelope = element;
14334     }
14335     else if (element == EL_EMC_LENSES)
14336     {
14337       game.lenses_time_left = level.lenses_time * FRAMES_PER_SECOND;
14338
14339       RedrawAllInvisibleElementsForLenses();
14340     }
14341     else if (element == EL_EMC_MAGNIFIER)
14342     {
14343       game.magnify_time_left = level.magnify_time * FRAMES_PER_SECOND;
14344
14345       RedrawAllInvisibleElementsForMagnifier();
14346     }
14347     else if (IS_DROPPABLE(element) ||
14348              IS_THROWABLE(element))     // can be collected and dropped
14349     {
14350       int i;
14351
14352       if (collect_count == 0)
14353         player->inventory_infinite_element = element;
14354       else
14355         for (i = 0; i < collect_count; i++)
14356           if (player->inventory_size < MAX_INVENTORY_SIZE)
14357             player->inventory_element[player->inventory_size++] = element;
14358
14359       DrawGameDoorValues();
14360     }
14361     else if (collect_count > 0)
14362     {
14363       game.gems_still_needed -= collect_count;
14364       if (game.gems_still_needed < 0)
14365         game.gems_still_needed = 0;
14366
14367       game.snapshot.collected_item = TRUE;
14368
14369       game_panel_controls[GAME_PANEL_GEMS].value = game.gems_still_needed;
14370
14371       DisplayGameControlValues();
14372     }
14373
14374     RaiseScoreElement(element);
14375     PlayLevelSoundElementAction(x, y, element, ACTION_COLLECTING);
14376
14377     // use old behaviour for old levels (collecting)
14378     if (!level.finish_dig_collect && is_player)
14379     {
14380       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_COLLECTS_X,
14381                                           player->index_bit, dig_side);
14382
14383       // if collecting triggered player relocation, finish collecting tile
14384       if (mode == DF_DIG && (player->jx != jx || player->jy != jy))
14385         SetFieldForSnapping(x, y, element, move_direction, player->index_bit);
14386     }
14387
14388     if (mode == DF_SNAP)
14389     {
14390       if (level.block_snap_field)
14391         SetFieldForSnapping(x, y, element, move_direction, player->index_bit);
14392       else
14393         TestFieldAfterSnapping(x, y, element, move_direction, player->index_bit);
14394
14395       // use old behaviour for old levels (snapping)
14396       if (!level.finish_dig_collect)
14397         CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SNAPS_X,
14398                                             player->index_bit, dig_side);
14399     }
14400   }
14401   else if (player_can_move_or_snap && IS_PUSHABLE(element))
14402   {
14403     if (mode == DF_SNAP && element != EL_BD_ROCK)
14404       return MP_NO_ACTION;
14405
14406     if (CAN_FALL(element) && dy)
14407       return MP_NO_ACTION;
14408
14409     if (CAN_FALL(element) && IN_LEV_FIELD(x, y + 1) && IS_FREE(x, y + 1) &&
14410         !(element == EL_SPRING && level.use_spring_bug))
14411       return MP_NO_ACTION;
14412
14413     if (CAN_MOVE(element) && GET_MAX_MOVE_DELAY(element) == 0 &&
14414         ((move_direction & MV_VERTICAL &&
14415           ((element_info[element].move_pattern & MV_LEFT &&
14416             IN_LEV_FIELD(x - 1, y) && IS_FREE(x - 1, y)) ||
14417            (element_info[element].move_pattern & MV_RIGHT &&
14418             IN_LEV_FIELD(x + 1, y) && IS_FREE(x + 1, y)))) ||
14419          (move_direction & MV_HORIZONTAL &&
14420           ((element_info[element].move_pattern & MV_UP &&
14421             IN_LEV_FIELD(x, y - 1) && IS_FREE(x, y - 1)) ||
14422            (element_info[element].move_pattern & MV_DOWN &&
14423             IN_LEV_FIELD(x, y + 1) && IS_FREE(x, y + 1))))))
14424       return MP_NO_ACTION;
14425
14426     // do not push elements already moving away faster than player
14427     if (CAN_MOVE(element) && MovDir[x][y] == move_direction &&
14428         ABS(getElementMoveStepsize(x, y)) > MOVE_STEPSIZE_NORMAL)
14429       return MP_NO_ACTION;
14430
14431     if (game.engine_version >= VERSION_IDENT(3,1,0,0))
14432     {
14433       if (player->push_delay_value == -1 || !player_was_pushing)
14434         player->push_delay_value = GET_NEW_PUSH_DELAY(element);
14435     }
14436     else if (game.engine_version >= VERSION_IDENT(3,0,7,1))
14437     {
14438       if (player->push_delay_value == -1)
14439         player->push_delay_value = GET_NEW_PUSH_DELAY(element);
14440     }
14441     else if (game.engine_version >= VERSION_IDENT(2,2,0,7))
14442     {
14443       if (!player->is_pushing)
14444         player->push_delay_value = GET_NEW_PUSH_DELAY(element);
14445     }
14446
14447     player->is_pushing = TRUE;
14448     player->is_active = TRUE;
14449
14450     if (!(IN_LEV_FIELD(nextx, nexty) &&
14451           (IS_FREE(nextx, nexty) ||
14452            (IS_SB_ELEMENT(element) &&
14453             Tile[nextx][nexty] == EL_SOKOBAN_FIELD_EMPTY) ||
14454            (IS_CUSTOM_ELEMENT(element) &&
14455             CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, nextx, nexty)))))
14456       return MP_NO_ACTION;
14457
14458     if (!checkDiagonalPushing(player, x, y, real_dx, real_dy))
14459       return MP_NO_ACTION;
14460
14461     if (player->push_delay == -1)       // new pushing; restart delay
14462       player->push_delay = 0;
14463
14464     if (player->push_delay < player->push_delay_value &&
14465         !(tape.playing && tape.file_version < FILE_VERSION_2_0) &&
14466         element != EL_SPRING && element != EL_BALLOON)
14467     {
14468       // make sure that there is no move delay before next try to push
14469       if (game.engine_version >= VERSION_IDENT(3,0,7,1))
14470         player->move_delay = 0;
14471
14472       return MP_NO_ACTION;
14473     }
14474
14475     if (IS_CUSTOM_ELEMENT(element) &&
14476         CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, nextx, nexty))
14477     {
14478       if (!DigFieldByCE(nextx, nexty, element))
14479         return MP_NO_ACTION;
14480     }
14481
14482     if (IS_SB_ELEMENT(element))
14483     {
14484       boolean sokoban_task_solved = FALSE;
14485
14486       if (element == EL_SOKOBAN_FIELD_FULL)
14487       {
14488         Back[x][y] = EL_SOKOBAN_FIELD_EMPTY;
14489
14490         IncrementSokobanFieldsNeeded();
14491         IncrementSokobanObjectsNeeded();
14492       }
14493
14494       if (Tile[nextx][nexty] == EL_SOKOBAN_FIELD_EMPTY)
14495       {
14496         Back[nextx][nexty] = EL_SOKOBAN_FIELD_EMPTY;
14497
14498         DecrementSokobanFieldsNeeded();
14499         DecrementSokobanObjectsNeeded();
14500
14501         // sokoban object was pushed from empty field to sokoban field
14502         if (Back[x][y] == EL_EMPTY)
14503           sokoban_task_solved = TRUE;
14504       }
14505
14506       Tile[x][y] = EL_SOKOBAN_OBJECT;
14507
14508       if (Back[x][y] == Back[nextx][nexty])
14509         PlayLevelSoundAction(x, y, ACTION_PUSHING);
14510       else if (Back[x][y] != 0)
14511         PlayLevelSoundElementAction(x, y, EL_SOKOBAN_FIELD_FULL,
14512                                     ACTION_EMPTYING);
14513       else
14514         PlayLevelSoundElementAction(nextx, nexty, EL_SOKOBAN_FIELD_EMPTY,
14515                                     ACTION_FILLING);
14516
14517       if (sokoban_task_solved &&
14518           game.sokoban_fields_still_needed == 0 &&
14519           game.sokoban_objects_still_needed == 0 &&
14520           (game.emulation == EMU_SOKOBAN || level.auto_exit_sokoban))
14521       {
14522         game.players_still_needed = 0;
14523
14524         LevelSolved();
14525
14526         PlayLevelSound(x, y, SND_GAME_SOKOBAN_SOLVING);
14527       }
14528     }
14529     else
14530       PlayLevelSoundElementAction(x, y, element, ACTION_PUSHING);
14531
14532     InitMovingField(x, y, move_direction);
14533     GfxAction[x][y] = ACTION_PUSHING;
14534
14535     if (mode == DF_SNAP)
14536       ContinueMoving(x, y);
14537     else
14538       MovPos[x][y] = (dx != 0 ? dx : dy);
14539
14540     Pushed[x][y] = TRUE;
14541     Pushed[nextx][nexty] = TRUE;
14542
14543     if (game.engine_version < VERSION_IDENT(2,2,0,7))
14544       player->push_delay_value = GET_NEW_PUSH_DELAY(element);
14545     else
14546       player->push_delay_value = -1;    // get new value later
14547
14548     // check for element change _after_ element has been pushed
14549     if (game.use_change_when_pushing_bug)
14550     {
14551       CheckElementChangeByPlayer(x, y, element, CE_PUSHED_BY_PLAYER,
14552                                  player->index_bit, dig_side);
14553       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_PUSHES_X,
14554                                           player->index_bit, dig_side);
14555     }
14556   }
14557   else if (IS_SWITCHABLE(element))
14558   {
14559     if (PLAYER_SWITCHING(player, x, y))
14560     {
14561       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_PRESSES_X,
14562                                           player->index_bit, dig_side);
14563
14564       return MP_ACTION;
14565     }
14566
14567     player->is_switching = TRUE;
14568     player->switch_x = x;
14569     player->switch_y = y;
14570
14571     PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVATING);
14572
14573     if (element == EL_ROBOT_WHEEL)
14574     {
14575       Tile[x][y] = EL_ROBOT_WHEEL_ACTIVE;
14576
14577       game.robot_wheel_x = x;
14578       game.robot_wheel_y = y;
14579       game.robot_wheel_active = TRUE;
14580
14581       TEST_DrawLevelField(x, y);
14582     }
14583     else if (element == EL_SP_TERMINAL)
14584     {
14585       int xx, yy;
14586
14587       SCAN_PLAYFIELD(xx, yy)
14588       {
14589         if (Tile[xx][yy] == EL_SP_DISK_YELLOW)
14590         {
14591           Bang(xx, yy);
14592         }
14593         else if (Tile[xx][yy] == EL_SP_TERMINAL)
14594         {
14595           Tile[xx][yy] = EL_SP_TERMINAL_ACTIVE;
14596
14597           ResetGfxAnimation(xx, yy);
14598           TEST_DrawLevelField(xx, yy);
14599         }
14600       }
14601     }
14602     else if (IS_BELT_SWITCH(element))
14603     {
14604       ToggleBeltSwitch(x, y);
14605     }
14606     else if (element == EL_SWITCHGATE_SWITCH_UP ||
14607              element == EL_SWITCHGATE_SWITCH_DOWN ||
14608              element == EL_DC_SWITCHGATE_SWITCH_UP ||
14609              element == EL_DC_SWITCHGATE_SWITCH_DOWN)
14610     {
14611       ToggleSwitchgateSwitch(x, y);
14612     }
14613     else if (element == EL_LIGHT_SWITCH ||
14614              element == EL_LIGHT_SWITCH_ACTIVE)
14615     {
14616       ToggleLightSwitch(x, y);
14617     }
14618     else if (element == EL_TIMEGATE_SWITCH ||
14619              element == EL_DC_TIMEGATE_SWITCH)
14620     {
14621       ActivateTimegateSwitch(x, y);
14622     }
14623     else if (element == EL_BALLOON_SWITCH_LEFT  ||
14624              element == EL_BALLOON_SWITCH_RIGHT ||
14625              element == EL_BALLOON_SWITCH_UP    ||
14626              element == EL_BALLOON_SWITCH_DOWN  ||
14627              element == EL_BALLOON_SWITCH_NONE  ||
14628              element == EL_BALLOON_SWITCH_ANY)
14629     {
14630       game.wind_direction = (element == EL_BALLOON_SWITCH_LEFT  ? MV_LEFT  :
14631                              element == EL_BALLOON_SWITCH_RIGHT ? MV_RIGHT :
14632                              element == EL_BALLOON_SWITCH_UP    ? MV_UP    :
14633                              element == EL_BALLOON_SWITCH_DOWN  ? MV_DOWN  :
14634                              element == EL_BALLOON_SWITCH_NONE  ? MV_NONE  :
14635                              move_direction);
14636     }
14637     else if (element == EL_LAMP)
14638     {
14639       Tile[x][y] = EL_LAMP_ACTIVE;
14640       game.lights_still_needed--;
14641
14642       ResetGfxAnimation(x, y);
14643       TEST_DrawLevelField(x, y);
14644     }
14645     else if (element == EL_TIME_ORB_FULL)
14646     {
14647       Tile[x][y] = EL_TIME_ORB_EMPTY;
14648
14649       if (level.time > 0 || level.use_time_orb_bug)
14650       {
14651         TimeLeft += level.time_orb_time;
14652         game.no_time_limit = FALSE;
14653
14654         game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
14655
14656         DisplayGameControlValues();
14657       }
14658
14659       ResetGfxAnimation(x, y);
14660       TEST_DrawLevelField(x, y);
14661     }
14662     else if (element == EL_EMC_MAGIC_BALL_SWITCH ||
14663              element == EL_EMC_MAGIC_BALL_SWITCH_ACTIVE)
14664     {
14665       int xx, yy;
14666
14667       game.ball_active = !game.ball_active;
14668
14669       SCAN_PLAYFIELD(xx, yy)
14670       {
14671         int e = Tile[xx][yy];
14672
14673         if (game.ball_active)
14674         {
14675           if (e == EL_EMC_MAGIC_BALL)
14676             CreateField(xx, yy, EL_EMC_MAGIC_BALL_ACTIVE);
14677           else if (e == EL_EMC_MAGIC_BALL_SWITCH)
14678             CreateField(xx, yy, EL_EMC_MAGIC_BALL_SWITCH_ACTIVE);
14679         }
14680         else
14681         {
14682           if (e == EL_EMC_MAGIC_BALL_ACTIVE)
14683             CreateField(xx, yy, EL_EMC_MAGIC_BALL);
14684           else if (e == EL_EMC_MAGIC_BALL_SWITCH_ACTIVE)
14685             CreateField(xx, yy, EL_EMC_MAGIC_BALL_SWITCH);
14686         }
14687       }
14688     }
14689
14690     CheckTriggeredElementChangeByPlayer(x, y, element, CE_SWITCH_OF_X,
14691                                         player->index_bit, dig_side);
14692
14693     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SWITCHES_X,
14694                                         player->index_bit, dig_side);
14695
14696     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_PRESSES_X,
14697                                         player->index_bit, dig_side);
14698
14699     return MP_ACTION;
14700   }
14701   else
14702   {
14703     if (!PLAYER_SWITCHING(player, x, y))
14704     {
14705       player->is_switching = TRUE;
14706       player->switch_x = x;
14707       player->switch_y = y;
14708
14709       CheckElementChangeByPlayer(x, y, element, CE_SWITCHED,
14710                                  player->index_bit, dig_side);
14711       CheckTriggeredElementChangeByPlayer(x, y, element, CE_SWITCH_OF_X,
14712                                           player->index_bit, dig_side);
14713
14714       CheckElementChangeByPlayer(x, y, element, CE_SWITCHED_BY_PLAYER,
14715                                  player->index_bit, dig_side);
14716       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SWITCHES_X,
14717                                           player->index_bit, dig_side);
14718     }
14719
14720     CheckElementChangeByPlayer(x, y, element, CE_PRESSED_BY_PLAYER,
14721                                player->index_bit, dig_side);
14722     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_PRESSES_X,
14723                                         player->index_bit, dig_side);
14724
14725     return MP_NO_ACTION;
14726   }
14727
14728   player->push_delay = -1;
14729
14730   if (is_player)                // function can also be called by EL_PENGUIN
14731   {
14732     if (Tile[x][y] != element)          // really digged/collected something
14733     {
14734       player->is_collecting = !player->is_digging;
14735       player->is_active = TRUE;
14736
14737       player->last_removed_element = element;
14738     }
14739   }
14740
14741   return MP_MOVING;
14742 }
14743
14744 static boolean DigFieldByCE(int x, int y, int digging_element)
14745 {
14746   int element = Tile[x][y];
14747
14748   if (!IS_FREE(x, y))
14749   {
14750     int action = (IS_DIGGABLE(element) ? ACTION_DIGGING :
14751                   IS_COLLECTIBLE(element) ? ACTION_COLLECTING :
14752                   ACTION_BREAKING);
14753
14754     // no element can dig solid indestructible elements
14755     if (IS_INDESTRUCTIBLE(element) &&
14756         !IS_DIGGABLE(element) &&
14757         !IS_COLLECTIBLE(element))
14758       return FALSE;
14759
14760     if (AmoebaNr[x][y] &&
14761         (element == EL_AMOEBA_FULL ||
14762          element == EL_BD_AMOEBA ||
14763          element == EL_AMOEBA_GROWING))
14764     {
14765       AmoebaCnt[AmoebaNr[x][y]]--;
14766       AmoebaCnt2[AmoebaNr[x][y]]--;
14767     }
14768
14769     if (IS_MOVING(x, y))
14770       RemoveMovingField(x, y);
14771     else
14772     {
14773       RemoveField(x, y);
14774       TEST_DrawLevelField(x, y);
14775     }
14776
14777     // if digged element was about to explode, prevent the explosion
14778     ExplodeField[x][y] = EX_TYPE_NONE;
14779
14780     PlayLevelSoundAction(x, y, action);
14781   }
14782
14783   Store[x][y] = EL_EMPTY;
14784
14785   // this makes it possible to leave the removed element again
14786   if (IS_EQUAL_OR_IN_GROUP(element, MOVE_ENTER_EL(digging_element)))
14787     Store[x][y] = element;
14788
14789   return TRUE;
14790 }
14791
14792 static boolean SnapField(struct PlayerInfo *player, int dx, int dy)
14793 {
14794   int jx = player->jx, jy = player->jy;
14795   int x = jx + dx, y = jy + dy;
14796   int snap_direction = (dx == -1 ? MV_LEFT  :
14797                         dx == +1 ? MV_RIGHT :
14798                         dy == -1 ? MV_UP    :
14799                         dy == +1 ? MV_DOWN  : MV_NONE);
14800   boolean can_continue_snapping = (level.continuous_snapping &&
14801                                    WasJustFalling[x][y] < CHECK_DELAY_FALLING);
14802
14803   if (player->MovPos != 0 && game.engine_version >= VERSION_IDENT(2,2,0,0))
14804     return FALSE;
14805
14806   if (!player->active || !IN_LEV_FIELD(x, y))
14807     return FALSE;
14808
14809   if (dx && dy)
14810     return FALSE;
14811
14812   if (!dx && !dy)
14813   {
14814     if (player->MovPos == 0)
14815       player->is_pushing = FALSE;
14816
14817     player->is_snapping = FALSE;
14818
14819     if (player->MovPos == 0)
14820     {
14821       player->is_moving = FALSE;
14822       player->is_digging = FALSE;
14823       player->is_collecting = FALSE;
14824     }
14825
14826     return FALSE;
14827   }
14828
14829   // prevent snapping with already pressed snap key when not allowed
14830   if (player->is_snapping && !can_continue_snapping)
14831     return FALSE;
14832
14833   player->MovDir = snap_direction;
14834
14835   if (player->MovPos == 0)
14836   {
14837     player->is_moving = FALSE;
14838     player->is_digging = FALSE;
14839     player->is_collecting = FALSE;
14840   }
14841
14842   player->is_dropping = FALSE;
14843   player->is_dropping_pressed = FALSE;
14844   player->drop_pressed_delay = 0;
14845
14846   if (DigField(player, jx, jy, x, y, 0, 0, DF_SNAP) == MP_NO_ACTION)
14847     return FALSE;
14848
14849   player->is_snapping = TRUE;
14850   player->is_active = TRUE;
14851
14852   if (player->MovPos == 0)
14853   {
14854     player->is_moving = FALSE;
14855     player->is_digging = FALSE;
14856     player->is_collecting = FALSE;
14857   }
14858
14859   if (player->MovPos != 0)      // prevent graphic bugs in versions < 2.2.0
14860     TEST_DrawLevelField(player->last_jx, player->last_jy);
14861
14862   TEST_DrawLevelField(x, y);
14863
14864   return TRUE;
14865 }
14866
14867 static boolean DropElement(struct PlayerInfo *player)
14868 {
14869   int old_element, new_element;
14870   int dropx = player->jx, dropy = player->jy;
14871   int drop_direction = player->MovDir;
14872   int drop_side = drop_direction;
14873   int drop_element = get_next_dropped_element(player);
14874
14875   /* do not drop an element on top of another element; when holding drop key
14876      pressed without moving, dropped element must move away before the next
14877      element can be dropped (this is especially important if the next element
14878      is dynamite, which can be placed on background for historical reasons) */
14879   if (PLAYER_DROPPING(player, dropx, dropy) && Tile[dropx][dropy] != EL_EMPTY)
14880     return MP_ACTION;
14881
14882   if (IS_THROWABLE(drop_element))
14883   {
14884     dropx += GET_DX_FROM_DIR(drop_direction);
14885     dropy += GET_DY_FROM_DIR(drop_direction);
14886
14887     if (!IN_LEV_FIELD(dropx, dropy))
14888       return FALSE;
14889   }
14890
14891   old_element = Tile[dropx][dropy];     // old element at dropping position
14892   new_element = drop_element;           // default: no change when dropping
14893
14894   // check if player is active, not moving and ready to drop
14895   if (!player->active || player->MovPos || player->drop_delay > 0)
14896     return FALSE;
14897
14898   // check if player has anything that can be dropped
14899   if (new_element == EL_UNDEFINED)
14900     return FALSE;
14901
14902   // only set if player has anything that can be dropped
14903   player->is_dropping_pressed = TRUE;
14904
14905   // check if drop key was pressed long enough for EM style dynamite
14906   if (new_element == EL_EM_DYNAMITE && player->drop_pressed_delay < 40)
14907     return FALSE;
14908
14909   // check if anything can be dropped at the current position
14910   if (IS_ACTIVE_BOMB(old_element) || old_element == EL_EXPLOSION)
14911     return FALSE;
14912
14913   // collected custom elements can only be dropped on empty fields
14914   if (IS_CUSTOM_ELEMENT(new_element) && old_element != EL_EMPTY)
14915     return FALSE;
14916
14917   if (old_element != EL_EMPTY)
14918     Back[dropx][dropy] = old_element;   // store old element on this field
14919
14920   ResetGfxAnimation(dropx, dropy);
14921   ResetRandomAnimationValue(dropx, dropy);
14922
14923   if (player->inventory_size > 0 ||
14924       player->inventory_infinite_element != EL_UNDEFINED)
14925   {
14926     if (player->inventory_size > 0)
14927     {
14928       player->inventory_size--;
14929
14930       DrawGameDoorValues();
14931
14932       if (new_element == EL_DYNAMITE)
14933         new_element = EL_DYNAMITE_ACTIVE;
14934       else if (new_element == EL_EM_DYNAMITE)
14935         new_element = EL_EM_DYNAMITE_ACTIVE;
14936       else if (new_element == EL_SP_DISK_RED)
14937         new_element = EL_SP_DISK_RED_ACTIVE;
14938     }
14939
14940     Tile[dropx][dropy] = new_element;
14941
14942     if (IN_SCR_FIELD(SCREENX(dropx), SCREENY(dropy)))
14943       DrawGraphicThruMask(SCREENX(dropx), SCREENY(dropy),
14944                           el2img(Tile[dropx][dropy]), 0);
14945
14946     PlayLevelSoundAction(dropx, dropy, ACTION_DROPPING);
14947
14948     // needed if previous element just changed to "empty" in the last frame
14949     ChangeCount[dropx][dropy] = 0;      // allow at least one more change
14950
14951     CheckElementChangeByPlayer(dropx, dropy, new_element, CE_DROPPED_BY_PLAYER,
14952                                player->index_bit, drop_side);
14953     CheckTriggeredElementChangeByPlayer(dropx, dropy, new_element,
14954                                         CE_PLAYER_DROPS_X,
14955                                         player->index_bit, drop_side);
14956
14957     TestIfElementTouchesCustomElement(dropx, dropy);
14958   }
14959   else          // player is dropping a dyna bomb
14960   {
14961     player->dynabombs_left--;
14962
14963     Tile[dropx][dropy] = new_element;
14964
14965     if (IN_SCR_FIELD(SCREENX(dropx), SCREENY(dropy)))
14966       DrawGraphicThruMask(SCREENX(dropx), SCREENY(dropy),
14967                           el2img(Tile[dropx][dropy]), 0);
14968
14969     PlayLevelSoundAction(dropx, dropy, ACTION_DROPPING);
14970   }
14971
14972   if (Tile[dropx][dropy] == new_element) // uninitialized unless CE change
14973     InitField_WithBug1(dropx, dropy, FALSE);
14974
14975   new_element = Tile[dropx][dropy];     // element might have changed
14976
14977   if (IS_CUSTOM_ELEMENT(new_element) && CAN_MOVE(new_element) &&
14978       element_info[new_element].move_pattern == MV_WHEN_DROPPED)
14979   {
14980     if (element_info[new_element].move_direction_initial == MV_START_AUTOMATIC)
14981       MovDir[dropx][dropy] = drop_direction;
14982
14983     ChangeCount[dropx][dropy] = 0;      // allow at least one more change
14984
14985     // do not cause impact style collision by dropping elements that can fall
14986     CheckCollision[dropx][dropy] = CHECK_DELAY_COLLISION;
14987   }
14988
14989   player->drop_delay = GET_NEW_DROP_DELAY(drop_element);
14990   player->is_dropping = TRUE;
14991
14992   player->drop_pressed_delay = 0;
14993   player->is_dropping_pressed = FALSE;
14994
14995   player->drop_x = dropx;
14996   player->drop_y = dropy;
14997
14998   return TRUE;
14999 }
15000
15001 // ----------------------------------------------------------------------------
15002 // game sound playing functions
15003 // ----------------------------------------------------------------------------
15004
15005 static int *loop_sound_frame = NULL;
15006 static int *loop_sound_volume = NULL;
15007
15008 void InitPlayLevelSound(void)
15009 {
15010   int num_sounds = getSoundListSize();
15011
15012   checked_free(loop_sound_frame);
15013   checked_free(loop_sound_volume);
15014
15015   loop_sound_frame  = checked_calloc(num_sounds * sizeof(int));
15016   loop_sound_volume = checked_calloc(num_sounds * sizeof(int));
15017 }
15018
15019 static void PlayLevelSound(int x, int y, int nr)
15020 {
15021   int sx = SCREENX(x), sy = SCREENY(y);
15022   int volume, stereo_position;
15023   int max_distance = 8;
15024   int type = (IS_LOOP_SOUND(nr) ? SND_CTRL_PLAY_LOOP : SND_CTRL_PLAY_SOUND);
15025
15026   if ((!setup.sound_simple && !IS_LOOP_SOUND(nr)) ||
15027       (!setup.sound_loops && IS_LOOP_SOUND(nr)))
15028     return;
15029
15030   if (!IN_LEV_FIELD(x, y) ||
15031       sx < -max_distance || sx >= SCR_FIELDX + max_distance ||
15032       sy < -max_distance || sy >= SCR_FIELDY + max_distance)
15033     return;
15034
15035   volume = SOUND_MAX_VOLUME;
15036
15037   if (!IN_SCR_FIELD(sx, sy))
15038   {
15039     int dx = ABS(sx - SCR_FIELDX / 2) - SCR_FIELDX / 2;
15040     int dy = ABS(sy - SCR_FIELDY / 2) - SCR_FIELDY / 2;
15041
15042     volume -= volume * (dx > dy ? dx : dy) / max_distance;
15043   }
15044
15045   stereo_position = (SOUND_MAX_LEFT +
15046                      (sx + max_distance) * SOUND_MAX_LEFT2RIGHT /
15047                      (SCR_FIELDX + 2 * max_distance));
15048
15049   if (IS_LOOP_SOUND(nr))
15050   {
15051     /* This assures that quieter loop sounds do not overwrite louder ones,
15052        while restarting sound volume comparison with each new game frame. */
15053
15054     if (loop_sound_volume[nr] > volume && loop_sound_frame[nr] == FrameCounter)
15055       return;
15056
15057     loop_sound_volume[nr] = volume;
15058     loop_sound_frame[nr] = FrameCounter;
15059   }
15060
15061   PlaySoundExt(nr, volume, stereo_position, type);
15062 }
15063
15064 static void PlayLevelSoundNearest(int x, int y, int sound_action)
15065 {
15066   PlayLevelSound(x < LEVELX(BX1) ? LEVELX(BX1) :
15067                  x > LEVELX(BX2) ? LEVELX(BX2) : x,
15068                  y < LEVELY(BY1) ? LEVELY(BY1) :
15069                  y > LEVELY(BY2) ? LEVELY(BY2) : y,
15070                  sound_action);
15071 }
15072
15073 static void PlayLevelSoundAction(int x, int y, int action)
15074 {
15075   PlayLevelSoundElementAction(x, y, Tile[x][y], action);
15076 }
15077
15078 static void PlayLevelSoundElementAction(int x, int y, int element, int action)
15079 {
15080   int sound_effect = element_info[SND_ELEMENT(element)].sound[action];
15081
15082   if (sound_effect != SND_UNDEFINED)
15083     PlayLevelSound(x, y, sound_effect);
15084 }
15085
15086 static void PlayLevelSoundElementActionIfLoop(int x, int y, int element,
15087                                               int action)
15088 {
15089   int sound_effect = element_info[SND_ELEMENT(element)].sound[action];
15090
15091   if (sound_effect != SND_UNDEFINED && IS_LOOP_SOUND(sound_effect))
15092     PlayLevelSound(x, y, sound_effect);
15093 }
15094
15095 static void PlayLevelSoundActionIfLoop(int x, int y, int action)
15096 {
15097   int sound_effect = element_info[SND_ELEMENT(Tile[x][y])].sound[action];
15098
15099   if (sound_effect != SND_UNDEFINED && IS_LOOP_SOUND(sound_effect))
15100     PlayLevelSound(x, y, sound_effect);
15101 }
15102
15103 static void StopLevelSoundActionIfLoop(int x, int y, int action)
15104 {
15105   int sound_effect = element_info[SND_ELEMENT(Tile[x][y])].sound[action];
15106
15107   if (sound_effect != SND_UNDEFINED && IS_LOOP_SOUND(sound_effect))
15108     StopSound(sound_effect);
15109 }
15110
15111 static int getLevelMusicNr(void)
15112 {
15113   if (levelset.music[level_nr] != MUS_UNDEFINED)
15114     return levelset.music[level_nr];            // from config file
15115   else
15116     return MAP_NOCONF_MUSIC(level_nr);          // from music dir
15117 }
15118
15119 static void FadeLevelSounds(void)
15120 {
15121   FadeSounds();
15122 }
15123
15124 static void FadeLevelMusic(void)
15125 {
15126   int music_nr = getLevelMusicNr();
15127   char *curr_music = getCurrentlyPlayingMusicFilename();
15128   char *next_music = getMusicInfoEntryFilename(music_nr);
15129
15130   if (!strEqual(curr_music, next_music))
15131     FadeMusic();
15132 }
15133
15134 void FadeLevelSoundsAndMusic(void)
15135 {
15136   FadeLevelSounds();
15137   FadeLevelMusic();
15138 }
15139
15140 static void PlayLevelMusic(void)
15141 {
15142   int music_nr = getLevelMusicNr();
15143   char *curr_music = getCurrentlyPlayingMusicFilename();
15144   char *next_music = getMusicInfoEntryFilename(music_nr);
15145
15146   if (!strEqual(curr_music, next_music))
15147     PlayMusicLoop(music_nr);
15148 }
15149
15150 void PlayLevelSound_EM(int xx, int yy, int element_em, int sample)
15151 {
15152   int element = (element_em > -1 ? map_element_EM_to_RND_game(element_em) : 0);
15153   int offset = 0;
15154   int x = xx - offset;
15155   int y = yy - offset;
15156
15157   switch (sample)
15158   {
15159     case SOUND_blank:
15160       PlayLevelSoundElementAction(x, y, element, ACTION_WALKING);
15161       break;
15162
15163     case SOUND_roll:
15164       PlayLevelSoundElementAction(x, y, element, ACTION_PUSHING);
15165       break;
15166
15167     case SOUND_stone:
15168       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
15169       break;
15170
15171     case SOUND_nut:
15172       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
15173       break;
15174
15175     case SOUND_crack:
15176       PlayLevelSoundElementAction(x, y, element, ACTION_BREAKING);
15177       break;
15178
15179     case SOUND_bug:
15180       PlayLevelSoundElementAction(x, y, element, ACTION_MOVING);
15181       break;
15182
15183     case SOUND_tank:
15184       PlayLevelSoundElementAction(x, y, element, ACTION_MOVING);
15185       break;
15186
15187     case SOUND_android_clone:
15188       PlayLevelSoundElementAction(x, y, element, ACTION_DROPPING);
15189       break;
15190
15191     case SOUND_android_move:
15192       PlayLevelSoundElementAction(x, y, element, ACTION_MOVING);
15193       break;
15194
15195     case SOUND_spring:
15196       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
15197       break;
15198
15199     case SOUND_slurp:
15200       PlayLevelSoundElementAction(x, y, element, ACTION_EATING);
15201       break;
15202
15203     case SOUND_eater:
15204       PlayLevelSoundElementAction(x, y, element, ACTION_WAITING);
15205       break;
15206
15207     case SOUND_eater_eat:
15208       PlayLevelSoundElementAction(x, y, element, ACTION_DIGGING);
15209       break;
15210
15211     case SOUND_alien:
15212       PlayLevelSoundElementAction(x, y, element, ACTION_MOVING);
15213       break;
15214
15215     case SOUND_collect:
15216       PlayLevelSoundElementAction(x, y, element, ACTION_COLLECTING);
15217       break;
15218
15219     case SOUND_diamond:
15220       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
15221       break;
15222
15223     case SOUND_squash:
15224       // !!! CHECK THIS !!!
15225 #if 1
15226       PlayLevelSoundElementAction(x, y, element, ACTION_BREAKING);
15227 #else
15228       PlayLevelSoundElementAction(x, y, element, ACTION_SMASHED_BY_ROCK);
15229 #endif
15230       break;
15231
15232     case SOUND_wonderfall:
15233       PlayLevelSoundElementAction(x, y, element, ACTION_FILLING);
15234       break;
15235
15236     case SOUND_drip:
15237       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
15238       break;
15239
15240     case SOUND_push:
15241       PlayLevelSoundElementAction(x, y, element, ACTION_PUSHING);
15242       break;
15243
15244     case SOUND_dirt:
15245       PlayLevelSoundElementAction(x, y, element, ACTION_DIGGING);
15246       break;
15247
15248     case SOUND_acid:
15249       PlayLevelSoundElementAction(x, y, element, ACTION_SPLASHING);
15250       break;
15251
15252     case SOUND_ball:
15253       PlayLevelSoundElementAction(x, y, element, ACTION_DROPPING);
15254       break;
15255
15256     case SOUND_slide:
15257       PlayLevelSoundElementAction(x, y, element, ACTION_GROWING);
15258       break;
15259
15260     case SOUND_wonder:
15261       PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVE);
15262       break;
15263
15264     case SOUND_door:
15265       PlayLevelSoundElementAction(x, y, element, ACTION_PASSING);
15266       break;
15267
15268     case SOUND_exit_open:
15269       PlayLevelSoundElementAction(x, y, element, ACTION_OPENING);
15270       break;
15271
15272     case SOUND_exit_leave:
15273       PlayLevelSoundElementAction(x, y, element, ACTION_PASSING);
15274       break;
15275
15276     case SOUND_dynamite:
15277       PlayLevelSoundElementAction(x, y, element, ACTION_DROPPING);
15278       break;
15279
15280     case SOUND_tick:
15281       PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVE);
15282       break;
15283
15284     case SOUND_press:
15285       PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVATING);
15286       break;
15287
15288     case SOUND_wheel:
15289       PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVE);
15290       break;
15291
15292     case SOUND_boom:
15293       PlayLevelSoundElementAction(x, y, element, ACTION_EXPLODING);
15294       break;
15295
15296     case SOUND_die:
15297       PlayLevelSoundElementAction(x, y, element, ACTION_DYING);
15298       break;
15299
15300     case SOUND_time:
15301       PlaySound(SND_GAME_RUNNING_OUT_OF_TIME);
15302       break;
15303
15304     default:
15305       PlayLevelSoundElementAction(x, y, element, ACTION_DEFAULT);
15306       break;
15307   }
15308 }
15309
15310 void PlayLevelSound_SP(int xx, int yy, int element_sp, int action_sp)
15311 {
15312   int element = map_element_SP_to_RND(element_sp);
15313   int action = map_action_SP_to_RND(action_sp);
15314   int offset = (setup.sp_show_border_elements ? 0 : 1);
15315   int x = xx - offset;
15316   int y = yy - offset;
15317
15318   PlayLevelSoundElementAction(x, y, element, action);
15319 }
15320
15321 void PlayLevelSound_MM(int xx, int yy, int element_mm, int action_mm)
15322 {
15323   int element = map_element_MM_to_RND(element_mm);
15324   int action = map_action_MM_to_RND(action_mm);
15325   int offset = 0;
15326   int x = xx - offset;
15327   int y = yy - offset;
15328
15329   if (!IS_MM_ELEMENT(element))
15330     element = EL_MM_DEFAULT;
15331
15332   PlayLevelSoundElementAction(x, y, element, action);
15333 }
15334
15335 void PlaySound_MM(int sound_mm)
15336 {
15337   int sound = map_sound_MM_to_RND(sound_mm);
15338
15339   if (sound == SND_UNDEFINED)
15340     return;
15341
15342   PlaySound(sound);
15343 }
15344
15345 void PlaySoundLoop_MM(int sound_mm)
15346 {
15347   int sound = map_sound_MM_to_RND(sound_mm);
15348
15349   if (sound == SND_UNDEFINED)
15350     return;
15351
15352   PlaySoundLoop(sound);
15353 }
15354
15355 void StopSound_MM(int sound_mm)
15356 {
15357   int sound = map_sound_MM_to_RND(sound_mm);
15358
15359   if (sound == SND_UNDEFINED)
15360     return;
15361
15362   StopSound(sound);
15363 }
15364
15365 void RaiseScore(int value)
15366 {
15367   game.score += value;
15368
15369   game_panel_controls[GAME_PANEL_SCORE].value = game.score;
15370
15371   DisplayGameControlValues();
15372 }
15373
15374 void RaiseScoreElement(int element)
15375 {
15376   switch (element)
15377   {
15378     case EL_EMERALD:
15379     case EL_BD_DIAMOND:
15380     case EL_EMERALD_YELLOW:
15381     case EL_EMERALD_RED:
15382     case EL_EMERALD_PURPLE:
15383     case EL_SP_INFOTRON:
15384       RaiseScore(level.score[SC_EMERALD]);
15385       break;
15386     case EL_DIAMOND:
15387       RaiseScore(level.score[SC_DIAMOND]);
15388       break;
15389     case EL_CRYSTAL:
15390       RaiseScore(level.score[SC_CRYSTAL]);
15391       break;
15392     case EL_PEARL:
15393       RaiseScore(level.score[SC_PEARL]);
15394       break;
15395     case EL_BUG:
15396     case EL_BD_BUTTERFLY:
15397     case EL_SP_ELECTRON:
15398       RaiseScore(level.score[SC_BUG]);
15399       break;
15400     case EL_SPACESHIP:
15401     case EL_BD_FIREFLY:
15402     case EL_SP_SNIKSNAK:
15403       RaiseScore(level.score[SC_SPACESHIP]);
15404       break;
15405     case EL_YAMYAM:
15406     case EL_DARK_YAMYAM:
15407       RaiseScore(level.score[SC_YAMYAM]);
15408       break;
15409     case EL_ROBOT:
15410       RaiseScore(level.score[SC_ROBOT]);
15411       break;
15412     case EL_PACMAN:
15413       RaiseScore(level.score[SC_PACMAN]);
15414       break;
15415     case EL_NUT:
15416       RaiseScore(level.score[SC_NUT]);
15417       break;
15418     case EL_DYNAMITE:
15419     case EL_EM_DYNAMITE:
15420     case EL_SP_DISK_RED:
15421     case EL_DYNABOMB_INCREASE_NUMBER:
15422     case EL_DYNABOMB_INCREASE_SIZE:
15423     case EL_DYNABOMB_INCREASE_POWER:
15424       RaiseScore(level.score[SC_DYNAMITE]);
15425       break;
15426     case EL_SHIELD_NORMAL:
15427     case EL_SHIELD_DEADLY:
15428       RaiseScore(level.score[SC_SHIELD]);
15429       break;
15430     case EL_EXTRA_TIME:
15431       RaiseScore(level.extra_time_score);
15432       break;
15433     case EL_KEY_1:
15434     case EL_KEY_2:
15435     case EL_KEY_3:
15436     case EL_KEY_4:
15437     case EL_EM_KEY_1:
15438     case EL_EM_KEY_2:
15439     case EL_EM_KEY_3:
15440     case EL_EM_KEY_4:
15441     case EL_EMC_KEY_5:
15442     case EL_EMC_KEY_6:
15443     case EL_EMC_KEY_7:
15444     case EL_EMC_KEY_8:
15445     case EL_DC_KEY_WHITE:
15446       RaiseScore(level.score[SC_KEY]);
15447       break;
15448     default:
15449       RaiseScore(element_info[element].collect_score);
15450       break;
15451   }
15452 }
15453
15454 void RequestQuitGameExt(boolean skip_request, boolean quick_quit, char *message)
15455 {
15456   if (skip_request || Request(message, REQ_ASK | REQ_STAY_CLOSED))
15457   {
15458     if (!quick_quit)
15459     {
15460       // prevent short reactivation of overlay buttons while closing door
15461       SetOverlayActive(FALSE);
15462
15463       // door may still be open due to skipped or envelope style request
15464       CloseDoor(DOOR_CLOSE_1);
15465     }
15466
15467     if (network.enabled)
15468       SendToServer_StopPlaying(NETWORK_STOP_BY_PLAYER);
15469     else
15470     {
15471       if (quick_quit)
15472         FadeSkipNextFadeIn();
15473
15474       SetGameStatus(GAME_MODE_MAIN);
15475
15476       DrawMainMenu();
15477     }
15478   }
15479   else          // continue playing the game
15480   {
15481     if (tape.playing && tape.deactivate_display)
15482       TapeDeactivateDisplayOff(TRUE);
15483
15484     OpenDoor(DOOR_OPEN_1 | DOOR_COPY_BACK);
15485
15486     if (tape.playing && tape.deactivate_display)
15487       TapeDeactivateDisplayOn();
15488   }
15489 }
15490
15491 void RequestQuitGame(boolean escape_key_pressed)
15492 {
15493   boolean ask_on_escape = (setup.ask_on_escape && setup.ask_on_quit_game);
15494   boolean quick_quit = ((escape_key_pressed && !ask_on_escape) ||
15495                         level_editor_test_game);
15496   boolean skip_request = (game.all_players_gone || !setup.ask_on_quit_game ||
15497                           quick_quit);
15498
15499   RequestQuitGameExt(skip_request, quick_quit,
15500                      "Do you really want to quit the game?");
15501 }
15502
15503 void RequestRestartGame(char *message)
15504 {
15505   game.restart_game_message = NULL;
15506
15507   boolean has_started_game = hasStartedNetworkGame();
15508   int request_mode = (has_started_game ? REQ_ASK : REQ_CONFIRM);
15509
15510   if (Request(message, request_mode | REQ_STAY_CLOSED) && has_started_game)
15511   {
15512     StartGameActions(network.enabled, setup.autorecord, level.random_seed);
15513   }
15514   else
15515   {
15516     // needed in case of envelope request to close game panel
15517     CloseDoor(DOOR_CLOSE_1);
15518
15519     SetGameStatus(GAME_MODE_MAIN);
15520
15521     DrawMainMenu();
15522   }
15523 }
15524
15525 void CheckGameOver(void)
15526 {
15527   static boolean last_game_over = FALSE;
15528   static int game_over_delay = 0;
15529   int game_over_delay_value = 50;
15530   boolean game_over = checkGameFailed();
15531
15532   // do not handle game over if request dialog is already active
15533   if (game.request_active)
15534     return;
15535
15536   // do not ask to play again if game was never actually played
15537   if (!game.GamePlayed)
15538     return;
15539
15540   if (!game_over)
15541   {
15542     last_game_over = FALSE;
15543     game_over_delay = game_over_delay_value;
15544
15545     return;
15546   }
15547
15548   if (game_over_delay > 0)
15549   {
15550     game_over_delay--;
15551
15552     return;
15553   }
15554
15555   if (last_game_over != game_over)
15556     game.restart_game_message = (hasStartedNetworkGame() ?
15557                                  "Game over! Play it again?" :
15558                                  "Game over!");
15559
15560   last_game_over = game_over;
15561 }
15562
15563 boolean checkGameSolved(void)
15564 {
15565   // set for all game engines if level was solved
15566   return game.LevelSolved_GameEnd;
15567 }
15568
15569 boolean checkGameFailed(void)
15570 {
15571   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
15572     return (game_em.game_over && !game_em.level_solved);
15573   else if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
15574     return (game_sp.game_over && !game_sp.level_solved);
15575   else if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
15576     return (game_mm.game_over && !game_mm.level_solved);
15577   else                          // GAME_ENGINE_TYPE_RND
15578     return (game.GameOver && !game.LevelSolved);
15579 }
15580
15581 boolean checkGameEnded(void)
15582 {
15583   return (checkGameSolved() || checkGameFailed());
15584 }
15585
15586
15587 // ----------------------------------------------------------------------------
15588 // random generator functions
15589 // ----------------------------------------------------------------------------
15590
15591 unsigned int InitEngineRandom_RND(int seed)
15592 {
15593   game.num_random_calls = 0;
15594
15595   return InitEngineRandom(seed);
15596 }
15597
15598 unsigned int RND(int max)
15599 {
15600   if (max > 0)
15601   {
15602     game.num_random_calls++;
15603
15604     return GetEngineRandom(max);
15605   }
15606
15607   return 0;
15608 }
15609
15610
15611 // ----------------------------------------------------------------------------
15612 // game engine snapshot handling functions
15613 // ----------------------------------------------------------------------------
15614
15615 struct EngineSnapshotInfo
15616 {
15617   // runtime values for custom element collect score
15618   int collect_score[NUM_CUSTOM_ELEMENTS];
15619
15620   // runtime values for group element choice position
15621   int choice_pos[NUM_GROUP_ELEMENTS];
15622
15623   // runtime values for belt position animations
15624   int belt_graphic[4][NUM_BELT_PARTS];
15625   int belt_anim_mode[4][NUM_BELT_PARTS];
15626 };
15627
15628 static struct EngineSnapshotInfo engine_snapshot_rnd;
15629 static char *snapshot_level_identifier = NULL;
15630 static int snapshot_level_nr = -1;
15631
15632 static void SaveEngineSnapshotValues_RND(void)
15633 {
15634   static int belt_base_active_element[4] =
15635   {
15636     EL_CONVEYOR_BELT_1_LEFT_ACTIVE,
15637     EL_CONVEYOR_BELT_2_LEFT_ACTIVE,
15638     EL_CONVEYOR_BELT_3_LEFT_ACTIVE,
15639     EL_CONVEYOR_BELT_4_LEFT_ACTIVE
15640   };
15641   int i, j;
15642
15643   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
15644   {
15645     int element = EL_CUSTOM_START + i;
15646
15647     engine_snapshot_rnd.collect_score[i] = element_info[element].collect_score;
15648   }
15649
15650   for (i = 0; i < NUM_GROUP_ELEMENTS; i++)
15651   {
15652     int element = EL_GROUP_START + i;
15653
15654     engine_snapshot_rnd.choice_pos[i] = element_info[element].group->choice_pos;
15655   }
15656
15657   for (i = 0; i < 4; i++)
15658   {
15659     for (j = 0; j < NUM_BELT_PARTS; j++)
15660     {
15661       int element = belt_base_active_element[i] + j;
15662       int graphic = el2img(element);
15663       int anim_mode = graphic_info[graphic].anim_mode;
15664
15665       engine_snapshot_rnd.belt_graphic[i][j] = graphic;
15666       engine_snapshot_rnd.belt_anim_mode[i][j] = anim_mode;
15667     }
15668   }
15669 }
15670
15671 static void LoadEngineSnapshotValues_RND(void)
15672 {
15673   unsigned int num_random_calls = game.num_random_calls;
15674   int i, j;
15675
15676   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
15677   {
15678     int element = EL_CUSTOM_START + i;
15679
15680     element_info[element].collect_score = engine_snapshot_rnd.collect_score[i];
15681   }
15682
15683   for (i = 0; i < NUM_GROUP_ELEMENTS; i++)
15684   {
15685     int element = EL_GROUP_START + i;
15686
15687     element_info[element].group->choice_pos = engine_snapshot_rnd.choice_pos[i];
15688   }
15689
15690   for (i = 0; i < 4; i++)
15691   {
15692     for (j = 0; j < NUM_BELT_PARTS; j++)
15693     {
15694       int graphic = engine_snapshot_rnd.belt_graphic[i][j];
15695       int anim_mode = engine_snapshot_rnd.belt_anim_mode[i][j];
15696
15697       graphic_info[graphic].anim_mode = anim_mode;
15698     }
15699   }
15700
15701   if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
15702   {
15703     InitRND(tape.random_seed);
15704     for (i = 0; i < num_random_calls; i++)
15705       RND(1);
15706   }
15707
15708   if (game.num_random_calls != num_random_calls)
15709   {
15710     Error("number of random calls out of sync");
15711     Error("number of random calls should be %d", num_random_calls);
15712     Error("number of random calls is %d", game.num_random_calls);
15713
15714     Fail("this should not happen -- please debug");
15715   }
15716 }
15717
15718 void FreeEngineSnapshotSingle(void)
15719 {
15720   FreeSnapshotSingle();
15721
15722   setString(&snapshot_level_identifier, NULL);
15723   snapshot_level_nr = -1;
15724 }
15725
15726 void FreeEngineSnapshotList(void)
15727 {
15728   FreeSnapshotList();
15729 }
15730
15731 static ListNode *SaveEngineSnapshotBuffers(void)
15732 {
15733   ListNode *buffers = NULL;
15734
15735   // copy some special values to a structure better suited for the snapshot
15736
15737   if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
15738     SaveEngineSnapshotValues_RND();
15739   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
15740     SaveEngineSnapshotValues_EM();
15741   if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
15742     SaveEngineSnapshotValues_SP(&buffers);
15743   if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
15744     SaveEngineSnapshotValues_MM(&buffers);
15745
15746   // save values stored in special snapshot structure
15747
15748   if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
15749     SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(engine_snapshot_rnd));
15750   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
15751     SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(engine_snapshot_em));
15752   if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
15753     SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(engine_snapshot_sp));
15754   if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
15755     SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(engine_snapshot_mm));
15756
15757   // save further RND engine values
15758
15759   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(stored_player));
15760   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(game));
15761   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(tape));
15762
15763   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(FrameCounter));
15764   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(TimeFrames));
15765   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(TimePlayed));
15766   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(TimeLeft));
15767   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(TapeTime));
15768
15769   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ScreenMovDir));
15770   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ScreenMovPos));
15771   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ScreenGfxPos));
15772
15773   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ScrollStepSize));
15774
15775   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(AmoebaCnt));
15776   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(AmoebaCnt2));
15777
15778   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Tile));
15779   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(MovPos));
15780   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(MovDir));
15781   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(MovDelay));
15782   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ChangeDelay));
15783   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ChangePage));
15784   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(CustomValue));
15785   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Store));
15786   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Store2));
15787   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(StorePlayer));
15788   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Back));
15789   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(AmoebaNr));
15790   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(WasJustMoving));
15791   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(WasJustFalling));
15792   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(CheckCollision));
15793   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(CheckImpact));
15794   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Stop));
15795   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Pushed));
15796
15797   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ChangeCount));
15798   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ChangeEvent));
15799
15800   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ExplodePhase));
15801   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ExplodeDelay));
15802   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ExplodeField));
15803
15804   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(RunnerVisit));
15805   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(PlayerVisit));
15806
15807   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxFrame));
15808   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxRandom));
15809   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxElement));
15810   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxAction));
15811   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxDir));
15812
15813   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(scroll_x));
15814   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(scroll_y));
15815
15816 #if 0
15817   ListNode *node = engine_snapshot_list_rnd;
15818   int num_bytes = 0;
15819
15820   while (node != NULL)
15821   {
15822     num_bytes += ((struct EngineSnapshotNodeInfo *)node->content)->size;
15823
15824     node = node->next;
15825   }
15826
15827   Debug("game:playing:SaveEngineSnapshotBuffers",
15828         "size of engine snapshot: %d bytes", num_bytes);
15829 #endif
15830
15831   return buffers;
15832 }
15833
15834 void SaveEngineSnapshotSingle(void)
15835 {
15836   ListNode *buffers = SaveEngineSnapshotBuffers();
15837
15838   // finally save all snapshot buffers to single snapshot
15839   SaveSnapshotSingle(buffers);
15840
15841   // save level identification information
15842   setString(&snapshot_level_identifier, leveldir_current->identifier);
15843   snapshot_level_nr = level_nr;
15844 }
15845
15846 boolean CheckSaveEngineSnapshotToList(void)
15847 {
15848   boolean save_snapshot =
15849     ((game.snapshot.mode == SNAPSHOT_MODE_EVERY_STEP) ||
15850      (game.snapshot.mode == SNAPSHOT_MODE_EVERY_MOVE &&
15851       game.snapshot.changed_action) ||
15852      (game.snapshot.mode == SNAPSHOT_MODE_EVERY_COLLECT &&
15853       game.snapshot.collected_item));
15854
15855   game.snapshot.changed_action = FALSE;
15856   game.snapshot.collected_item = FALSE;
15857   game.snapshot.save_snapshot = save_snapshot;
15858
15859   return save_snapshot;
15860 }
15861
15862 void SaveEngineSnapshotToList(void)
15863 {
15864   if (game.snapshot.mode == SNAPSHOT_MODE_OFF ||
15865       tape.quick_resume)
15866     return;
15867
15868   ListNode *buffers = SaveEngineSnapshotBuffers();
15869
15870   // finally save all snapshot buffers to snapshot list
15871   SaveSnapshotToList(buffers);
15872 }
15873
15874 void SaveEngineSnapshotToListInitial(void)
15875 {
15876   FreeEngineSnapshotList();
15877
15878   SaveEngineSnapshotToList();
15879 }
15880
15881 static void LoadEngineSnapshotValues(void)
15882 {
15883   // restore special values from snapshot structure
15884
15885   if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
15886     LoadEngineSnapshotValues_RND();
15887   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
15888     LoadEngineSnapshotValues_EM();
15889   if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
15890     LoadEngineSnapshotValues_SP();
15891   if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
15892     LoadEngineSnapshotValues_MM();
15893 }
15894
15895 void LoadEngineSnapshotSingle(void)
15896 {
15897   LoadSnapshotSingle();
15898
15899   LoadEngineSnapshotValues();
15900 }
15901
15902 static void LoadEngineSnapshot_Undo(int steps)
15903 {
15904   LoadSnapshotFromList_Older(steps);
15905
15906   LoadEngineSnapshotValues();
15907 }
15908
15909 static void LoadEngineSnapshot_Redo(int steps)
15910 {
15911   LoadSnapshotFromList_Newer(steps);
15912
15913   LoadEngineSnapshotValues();
15914 }
15915
15916 boolean CheckEngineSnapshotSingle(void)
15917 {
15918   return (strEqual(snapshot_level_identifier, leveldir_current->identifier) &&
15919           snapshot_level_nr == level_nr);
15920 }
15921
15922 boolean CheckEngineSnapshotList(void)
15923 {
15924   return CheckSnapshotList();
15925 }
15926
15927
15928 // ---------- new game button stuff -------------------------------------------
15929
15930 static struct
15931 {
15932   int graphic;
15933   struct XY *pos;
15934   int gadget_id;
15935   boolean *setup_value;
15936   boolean allowed_on_tape;
15937   boolean is_touch_button;
15938   char *infotext;
15939 } gamebutton_info[NUM_GAME_BUTTONS] =
15940 {
15941   {
15942     IMG_GFX_GAME_BUTTON_STOP,                   &game.button.stop,
15943     GAME_CTRL_ID_STOP,                          NULL,
15944     TRUE, FALSE,                                "stop game"
15945   },
15946   {
15947     IMG_GFX_GAME_BUTTON_PAUSE,                  &game.button.pause,
15948     GAME_CTRL_ID_PAUSE,                         NULL,
15949     TRUE, FALSE,                                "pause game"
15950   },
15951   {
15952     IMG_GFX_GAME_BUTTON_PLAY,                   &game.button.play,
15953     GAME_CTRL_ID_PLAY,                          NULL,
15954     TRUE, FALSE,                                "play game"
15955   },
15956   {
15957     IMG_GFX_GAME_BUTTON_UNDO,                   &game.button.undo,
15958     GAME_CTRL_ID_UNDO,                          NULL,
15959     TRUE, FALSE,                                "undo step"
15960   },
15961   {
15962     IMG_GFX_GAME_BUTTON_REDO,                   &game.button.redo,
15963     GAME_CTRL_ID_REDO,                          NULL,
15964     TRUE, FALSE,                                "redo step"
15965   },
15966   {
15967     IMG_GFX_GAME_BUTTON_SAVE,                   &game.button.save,
15968     GAME_CTRL_ID_SAVE,                          NULL,
15969     TRUE, FALSE,                                "save game"
15970   },
15971   {
15972     IMG_GFX_GAME_BUTTON_PAUSE2,                 &game.button.pause2,
15973     GAME_CTRL_ID_PAUSE2,                        NULL,
15974     TRUE, FALSE,                                "pause game"
15975   },
15976   {
15977     IMG_GFX_GAME_BUTTON_LOAD,                   &game.button.load,
15978     GAME_CTRL_ID_LOAD,                          NULL,
15979     TRUE, FALSE,                                "load game"
15980   },
15981   {
15982     IMG_GFX_GAME_BUTTON_PANEL_STOP,             &game.button.panel_stop,
15983     GAME_CTRL_ID_PANEL_STOP,                    NULL,
15984     FALSE, FALSE,                               "stop game"
15985   },
15986   {
15987     IMG_GFX_GAME_BUTTON_PANEL_PAUSE,            &game.button.panel_pause,
15988     GAME_CTRL_ID_PANEL_PAUSE,                   NULL,
15989     FALSE, FALSE,                               "pause game"
15990   },
15991   {
15992     IMG_GFX_GAME_BUTTON_PANEL_PLAY,             &game.button.panel_play,
15993     GAME_CTRL_ID_PANEL_PLAY,                    NULL,
15994     FALSE, FALSE,                               "play game"
15995   },
15996   {
15997     IMG_GFX_GAME_BUTTON_TOUCH_STOP,             &game.button.touch_stop,
15998     GAME_CTRL_ID_TOUCH_STOP,                    NULL,
15999     FALSE, TRUE,                                "stop game"
16000   },
16001   {
16002     IMG_GFX_GAME_BUTTON_TOUCH_PAUSE,            &game.button.touch_pause,
16003     GAME_CTRL_ID_TOUCH_PAUSE,                   NULL,
16004     FALSE, TRUE,                                "pause game"
16005   },
16006   {
16007     IMG_GFX_GAME_BUTTON_SOUND_MUSIC,            &game.button.sound_music,
16008     SOUND_CTRL_ID_MUSIC,                        &setup.sound_music,
16009     TRUE, FALSE,                                "background music on/off"
16010   },
16011   {
16012     IMG_GFX_GAME_BUTTON_SOUND_LOOPS,            &game.button.sound_loops,
16013     SOUND_CTRL_ID_LOOPS,                        &setup.sound_loops,
16014     TRUE, FALSE,                                "sound loops on/off"
16015   },
16016   {
16017     IMG_GFX_GAME_BUTTON_SOUND_SIMPLE,           &game.button.sound_simple,
16018     SOUND_CTRL_ID_SIMPLE,                       &setup.sound_simple,
16019     TRUE, FALSE,                                "normal sounds on/off"
16020   },
16021   {
16022     IMG_GFX_GAME_BUTTON_PANEL_SOUND_MUSIC,      &game.button.panel_sound_music,
16023     SOUND_CTRL_ID_PANEL_MUSIC,                  &setup.sound_music,
16024     FALSE, FALSE,                               "background music on/off"
16025   },
16026   {
16027     IMG_GFX_GAME_BUTTON_PANEL_SOUND_LOOPS,      &game.button.panel_sound_loops,
16028     SOUND_CTRL_ID_PANEL_LOOPS,                  &setup.sound_loops,
16029     FALSE, FALSE,                               "sound loops on/off"
16030   },
16031   {
16032     IMG_GFX_GAME_BUTTON_PANEL_SOUND_SIMPLE,     &game.button.panel_sound_simple,
16033     SOUND_CTRL_ID_PANEL_SIMPLE,                 &setup.sound_simple,
16034     FALSE, FALSE,                               "normal sounds on/off"
16035   }
16036 };
16037
16038 void CreateGameButtons(void)
16039 {
16040   int i;
16041
16042   for (i = 0; i < NUM_GAME_BUTTONS; i++)
16043   {
16044     int graphic = gamebutton_info[i].graphic;
16045     struct GraphicInfo *gfx = &graphic_info[graphic];
16046     struct XY *pos = gamebutton_info[i].pos;
16047     struct GadgetInfo *gi;
16048     int button_type;
16049     boolean checked;
16050     unsigned int event_mask;
16051     boolean is_touch_button = gamebutton_info[i].is_touch_button;
16052     boolean allowed_on_tape = gamebutton_info[i].allowed_on_tape;
16053     boolean on_tape = (tape.show_game_buttons && allowed_on_tape);
16054     int base_x = (is_touch_button ? 0 : on_tape ? VX : DX);
16055     int base_y = (is_touch_button ? 0 : on_tape ? VY : DY);
16056     int gd_x   = gfx->src_x;
16057     int gd_y   = gfx->src_y;
16058     int gd_xp  = gfx->src_x + gfx->pressed_xoffset;
16059     int gd_yp  = gfx->src_y + gfx->pressed_yoffset;
16060     int gd_xa  = gfx->src_x + gfx->active_xoffset;
16061     int gd_ya  = gfx->src_y + gfx->active_yoffset;
16062     int gd_xap = gfx->src_x + gfx->active_xoffset + gfx->pressed_xoffset;
16063     int gd_yap = gfx->src_y + gfx->active_yoffset + gfx->pressed_yoffset;
16064     int x = (is_touch_button ? pos->x : GDI_ACTIVE_POS(pos->x));
16065     int y = (is_touch_button ? pos->y : GDI_ACTIVE_POS(pos->y));
16066     int id = i;
16067
16068     if (gfx->bitmap == NULL)
16069     {
16070       game_gadget[id] = NULL;
16071
16072       continue;
16073     }
16074
16075     if (id == GAME_CTRL_ID_STOP ||
16076         id == GAME_CTRL_ID_PANEL_STOP ||
16077         id == GAME_CTRL_ID_TOUCH_STOP ||
16078         id == GAME_CTRL_ID_PLAY ||
16079         id == GAME_CTRL_ID_PANEL_PLAY ||
16080         id == GAME_CTRL_ID_SAVE ||
16081         id == GAME_CTRL_ID_LOAD)
16082     {
16083       button_type = GD_TYPE_NORMAL_BUTTON;
16084       checked = FALSE;
16085       event_mask = GD_EVENT_RELEASED;
16086     }
16087     else if (id == GAME_CTRL_ID_UNDO ||
16088              id == GAME_CTRL_ID_REDO)
16089     {
16090       button_type = GD_TYPE_NORMAL_BUTTON;
16091       checked = FALSE;
16092       event_mask = GD_EVENT_PRESSED | GD_EVENT_REPEATED;
16093     }
16094     else
16095     {
16096       button_type = GD_TYPE_CHECK_BUTTON;
16097       checked = (gamebutton_info[i].setup_value != NULL ?
16098                  *gamebutton_info[i].setup_value : FALSE);
16099       event_mask = GD_EVENT_PRESSED;
16100     }
16101
16102     gi = CreateGadget(GDI_CUSTOM_ID, id,
16103                       GDI_IMAGE_ID, graphic,
16104                       GDI_INFO_TEXT, gamebutton_info[i].infotext,
16105                       GDI_X, base_x + x,
16106                       GDI_Y, base_y + y,
16107                       GDI_WIDTH, gfx->width,
16108                       GDI_HEIGHT, gfx->height,
16109                       GDI_TYPE, button_type,
16110                       GDI_STATE, GD_BUTTON_UNPRESSED,
16111                       GDI_CHECKED, checked,
16112                       GDI_DESIGN_UNPRESSED, gfx->bitmap, gd_x, gd_y,
16113                       GDI_DESIGN_PRESSED, gfx->bitmap, gd_xp, gd_yp,
16114                       GDI_ALT_DESIGN_UNPRESSED, gfx->bitmap, gd_xa, gd_ya,
16115                       GDI_ALT_DESIGN_PRESSED, gfx->bitmap, gd_xap, gd_yap,
16116                       GDI_DIRECT_DRAW, FALSE,
16117                       GDI_OVERLAY_TOUCH_BUTTON, is_touch_button,
16118                       GDI_EVENT_MASK, event_mask,
16119                       GDI_CALLBACK_ACTION, HandleGameButtons,
16120                       GDI_END);
16121
16122     if (gi == NULL)
16123       Fail("cannot create gadget");
16124
16125     game_gadget[id] = gi;
16126   }
16127 }
16128
16129 void FreeGameButtons(void)
16130 {
16131   int i;
16132
16133   for (i = 0; i < NUM_GAME_BUTTONS; i++)
16134     FreeGadget(game_gadget[i]);
16135 }
16136
16137 static void UnmapGameButtonsAtSamePosition(int id)
16138 {
16139   int i;
16140
16141   for (i = 0; i < NUM_GAME_BUTTONS; i++)
16142     if (i != id &&
16143         gamebutton_info[i].pos->x == gamebutton_info[id].pos->x &&
16144         gamebutton_info[i].pos->y == gamebutton_info[id].pos->y)
16145       UnmapGadget(game_gadget[i]);
16146 }
16147
16148 static void UnmapGameButtonsAtSamePosition_All(void)
16149 {
16150   if (setup.show_snapshot_buttons)
16151   {
16152     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_SAVE);
16153     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PAUSE2);
16154     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_LOAD);
16155   }
16156   else
16157   {
16158     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_STOP);
16159     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PAUSE);
16160     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PLAY);
16161
16162     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PANEL_STOP);
16163     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PANEL_PAUSE);
16164     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PANEL_PLAY);
16165   }
16166 }
16167
16168 static void MapGameButtonsAtSamePosition(int id)
16169 {
16170   int i;
16171
16172   for (i = 0; i < NUM_GAME_BUTTONS; i++)
16173     if (i != id &&
16174         gamebutton_info[i].pos->x == gamebutton_info[id].pos->x &&
16175         gamebutton_info[i].pos->y == gamebutton_info[id].pos->y)
16176       MapGadget(game_gadget[i]);
16177
16178   UnmapGameButtonsAtSamePosition_All();
16179 }
16180
16181 void MapUndoRedoButtons(void)
16182 {
16183   UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_UNDO);
16184   UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_REDO);
16185
16186   MapGadget(game_gadget[GAME_CTRL_ID_UNDO]);
16187   MapGadget(game_gadget[GAME_CTRL_ID_REDO]);
16188 }
16189
16190 void UnmapUndoRedoButtons(void)
16191 {
16192   UnmapGadget(game_gadget[GAME_CTRL_ID_UNDO]);
16193   UnmapGadget(game_gadget[GAME_CTRL_ID_REDO]);
16194
16195   MapGameButtonsAtSamePosition(GAME_CTRL_ID_UNDO);
16196   MapGameButtonsAtSamePosition(GAME_CTRL_ID_REDO);
16197 }
16198
16199 void ModifyPauseButtons(void)
16200 {
16201   static int ids[] =
16202   {
16203     GAME_CTRL_ID_PAUSE,
16204     GAME_CTRL_ID_PAUSE2,
16205     GAME_CTRL_ID_PANEL_PAUSE,
16206     GAME_CTRL_ID_TOUCH_PAUSE,
16207     -1
16208   };
16209   int i;
16210
16211   for (i = 0; ids[i] > -1; i++)
16212     ModifyGadget(game_gadget[ids[i]], GDI_CHECKED, tape.pausing, GDI_END);
16213 }
16214
16215 static void MapGameButtonsExt(boolean on_tape)
16216 {
16217   int i;
16218
16219   for (i = 0; i < NUM_GAME_BUTTONS; i++)
16220     if ((!on_tape || gamebutton_info[i].allowed_on_tape) &&
16221         i != GAME_CTRL_ID_UNDO &&
16222         i != GAME_CTRL_ID_REDO)
16223       MapGadget(game_gadget[i]);
16224
16225   UnmapGameButtonsAtSamePosition_All();
16226
16227   RedrawGameButtons();
16228 }
16229
16230 static void UnmapGameButtonsExt(boolean on_tape)
16231 {
16232   int i;
16233
16234   for (i = 0; i < NUM_GAME_BUTTONS; i++)
16235     if (!on_tape || gamebutton_info[i].allowed_on_tape)
16236       UnmapGadget(game_gadget[i]);
16237 }
16238
16239 static void RedrawGameButtonsExt(boolean on_tape)
16240 {
16241   int i;
16242
16243   for (i = 0; i < NUM_GAME_BUTTONS; i++)
16244     if (!on_tape || gamebutton_info[i].allowed_on_tape)
16245       RedrawGadget(game_gadget[i]);
16246 }
16247
16248 static void SetGadgetState(struct GadgetInfo *gi, boolean state)
16249 {
16250   if (gi == NULL)
16251     return;
16252
16253   gi->checked = state;
16254 }
16255
16256 static void RedrawSoundButtonGadget(int id)
16257 {
16258   int id2 = (id == SOUND_CTRL_ID_MUSIC        ? SOUND_CTRL_ID_PANEL_MUSIC :
16259              id == SOUND_CTRL_ID_LOOPS        ? SOUND_CTRL_ID_PANEL_LOOPS :
16260              id == SOUND_CTRL_ID_SIMPLE       ? SOUND_CTRL_ID_PANEL_SIMPLE :
16261              id == SOUND_CTRL_ID_PANEL_MUSIC  ? SOUND_CTRL_ID_MUSIC :
16262              id == SOUND_CTRL_ID_PANEL_LOOPS  ? SOUND_CTRL_ID_LOOPS :
16263              id == SOUND_CTRL_ID_PANEL_SIMPLE ? SOUND_CTRL_ID_SIMPLE :
16264              id);
16265
16266   SetGadgetState(game_gadget[id2], *gamebutton_info[id2].setup_value);
16267   RedrawGadget(game_gadget[id2]);
16268 }
16269
16270 void MapGameButtons(void)
16271 {
16272   MapGameButtonsExt(FALSE);
16273 }
16274
16275 void UnmapGameButtons(void)
16276 {
16277   UnmapGameButtonsExt(FALSE);
16278 }
16279
16280 void RedrawGameButtons(void)
16281 {
16282   RedrawGameButtonsExt(FALSE);
16283 }
16284
16285 void MapGameButtonsOnTape(void)
16286 {
16287   MapGameButtonsExt(TRUE);
16288 }
16289
16290 void UnmapGameButtonsOnTape(void)
16291 {
16292   UnmapGameButtonsExt(TRUE);
16293 }
16294
16295 void RedrawGameButtonsOnTape(void)
16296 {
16297   RedrawGameButtonsExt(TRUE);
16298 }
16299
16300 static void GameUndoRedoExt(void)
16301 {
16302   ClearPlayerAction();
16303
16304   tape.pausing = TRUE;
16305
16306   RedrawPlayfield();
16307   UpdateAndDisplayGameControlValues();
16308
16309   DrawCompleteVideoDisplay();
16310   DrawVideoDisplay(VIDEO_STATE_TIME_ON, TapeTime);
16311   DrawVideoDisplay(VIDEO_STATE_FRAME_ON, FrameCounter);
16312   DrawVideoDisplay(VIDEO_STATE_1STEP(tape.single_step), 0);
16313
16314   BackToFront();
16315 }
16316
16317 static void GameUndo(int steps)
16318 {
16319   if (!CheckEngineSnapshotList())
16320     return;
16321
16322   LoadEngineSnapshot_Undo(steps);
16323
16324   GameUndoRedoExt();
16325 }
16326
16327 static void GameRedo(int steps)
16328 {
16329   if (!CheckEngineSnapshotList())
16330     return;
16331
16332   LoadEngineSnapshot_Redo(steps);
16333
16334   GameUndoRedoExt();
16335 }
16336
16337 static void HandleGameButtonsExt(int id, int button)
16338 {
16339   static boolean game_undo_executed = FALSE;
16340   int steps = BUTTON_STEPSIZE(button);
16341   boolean handle_game_buttons =
16342     (game_status == GAME_MODE_PLAYING ||
16343      (game_status == GAME_MODE_MAIN && tape.show_game_buttons));
16344
16345   if (!handle_game_buttons)
16346     return;
16347
16348   switch (id)
16349   {
16350     case GAME_CTRL_ID_STOP:
16351     case GAME_CTRL_ID_PANEL_STOP:
16352     case GAME_CTRL_ID_TOUCH_STOP:
16353       if (game_status == GAME_MODE_MAIN)
16354         break;
16355
16356       if (tape.playing)
16357         TapeStop();
16358       else
16359         RequestQuitGame(FALSE);
16360
16361       break;
16362
16363     case GAME_CTRL_ID_PAUSE:
16364     case GAME_CTRL_ID_PAUSE2:
16365     case GAME_CTRL_ID_PANEL_PAUSE:
16366     case GAME_CTRL_ID_TOUCH_PAUSE:
16367       if (network.enabled && game_status == GAME_MODE_PLAYING)
16368       {
16369         if (tape.pausing)
16370           SendToServer_ContinuePlaying();
16371         else
16372           SendToServer_PausePlaying();
16373       }
16374       else
16375         TapeTogglePause(TAPE_TOGGLE_MANUAL);
16376
16377       game_undo_executed = FALSE;
16378
16379       break;
16380
16381     case GAME_CTRL_ID_PLAY:
16382     case GAME_CTRL_ID_PANEL_PLAY:
16383       if (game_status == GAME_MODE_MAIN)
16384       {
16385         StartGameActions(network.enabled, setup.autorecord, level.random_seed);
16386       }
16387       else if (tape.pausing)
16388       {
16389         if (network.enabled)
16390           SendToServer_ContinuePlaying();
16391         else
16392           TapeTogglePause(TAPE_TOGGLE_MANUAL | TAPE_TOGGLE_PLAY_PAUSE);
16393       }
16394       break;
16395
16396     case GAME_CTRL_ID_UNDO:
16397       // Important: When using "save snapshot when collecting an item" mode,
16398       // load last (current) snapshot for first "undo" after pressing "pause"
16399       // (else the last-but-one snapshot would be loaded, because the snapshot
16400       // pointer already points to the last snapshot when pressing "pause",
16401       // which is fine for "every step/move" mode, but not for "every collect")
16402       if (game.snapshot.mode == SNAPSHOT_MODE_EVERY_COLLECT &&
16403           !game_undo_executed)
16404         steps--;
16405
16406       game_undo_executed = TRUE;
16407
16408       GameUndo(steps);
16409       break;
16410
16411     case GAME_CTRL_ID_REDO:
16412       GameRedo(steps);
16413       break;
16414
16415     case GAME_CTRL_ID_SAVE:
16416       TapeQuickSave();
16417       break;
16418
16419     case GAME_CTRL_ID_LOAD:
16420       TapeQuickLoad();
16421       break;
16422
16423     case SOUND_CTRL_ID_MUSIC:
16424     case SOUND_CTRL_ID_PANEL_MUSIC:
16425       if (setup.sound_music)
16426       {
16427         setup.sound_music = FALSE;
16428
16429         FadeMusic();
16430       }
16431       else if (audio.music_available)
16432       {
16433         setup.sound = setup.sound_music = TRUE;
16434
16435         SetAudioMode(setup.sound);
16436
16437         if (game_status == GAME_MODE_PLAYING)
16438           PlayLevelMusic();
16439       }
16440
16441       RedrawSoundButtonGadget(id);
16442
16443       break;
16444
16445     case SOUND_CTRL_ID_LOOPS:
16446     case SOUND_CTRL_ID_PANEL_LOOPS:
16447       if (setup.sound_loops)
16448         setup.sound_loops = FALSE;
16449       else if (audio.loops_available)
16450       {
16451         setup.sound = setup.sound_loops = TRUE;
16452
16453         SetAudioMode(setup.sound);
16454       }
16455
16456       RedrawSoundButtonGadget(id);
16457
16458       break;
16459
16460     case SOUND_CTRL_ID_SIMPLE:
16461     case SOUND_CTRL_ID_PANEL_SIMPLE:
16462       if (setup.sound_simple)
16463         setup.sound_simple = FALSE;
16464       else if (audio.sound_available)
16465       {
16466         setup.sound = setup.sound_simple = TRUE;
16467
16468         SetAudioMode(setup.sound);
16469       }
16470
16471       RedrawSoundButtonGadget(id);
16472
16473       break;
16474
16475     default:
16476       break;
16477   }
16478 }
16479
16480 static void HandleGameButtons(struct GadgetInfo *gi)
16481 {
16482   HandleGameButtonsExt(gi->custom_id, gi->event.button);
16483 }
16484
16485 void HandleSoundButtonKeys(Key key)
16486 {
16487   if (key == setup.shortcut.sound_simple)
16488     ClickOnGadget(game_gadget[SOUND_CTRL_ID_SIMPLE], MB_LEFTBUTTON);
16489   else if (key == setup.shortcut.sound_loops)
16490     ClickOnGadget(game_gadget[SOUND_CTRL_ID_LOOPS], MB_LEFTBUTTON);
16491   else if (key == setup.shortcut.sound_music)
16492     ClickOnGadget(game_gadget[SOUND_CTRL_ID_MUSIC], MB_LEFTBUTTON);
16493 }