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 //                  http://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()             (local_player->LevelSolved_PanelOff)
  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_CE_VALUE(e)     (   (element_info[e].ce_value_fixed_initial) +\
 883                                  RND(element_info[e].ce_value_random_initial))
 884 #define GET_CE_SCORE(e)         (   (element_info[e].collect_score))
 885 #define GET_CHANGE_DELAY(c)     (   ((c)->delay_fixed  * (c)->delay_frames) + \
 886                                  RND((c)->delay_random * (c)->delay_frames))
 887 #define GET_CE_DELAY_VALUE(c)   (   ((c)->delay_fixed) + \
 888                                  RND((c)->delay_random))
 889
 890
 891 #define GET_VALID_RUNTIME_ELEMENT(e)                                    \
 892          ((e) >= NUM_RUNTIME_ELEMENTS ? EL_UNKNOWN : (e))
 893
 894 #define RESOLVED_REFERENCE_ELEMENT(be, e)                               \
 895         ((be) + (e) - EL_SELF < EL_CUSTOM_START ? EL_CUSTOM_START :     \
 896          (be) + (e) - EL_SELF > EL_CUSTOM_END   ? EL_CUSTOM_END :       \
 897          (be) + (e) - EL_SELF)
 898
 899 #define GET_PLAYER_FROM_BITS(p)                                         \
 900         (EL_PLAYER_1 + ((p) != PLAYER_BITS_ANY ? log_2(p) : 0))
 901
 902 #define GET_TARGET_ELEMENT(be, e, ch, cv, cs)                           \
 903         ((e) == EL_TRIGGER_PLAYER   ? (ch)->actual_trigger_player    :  \
 904          (e) == EL_TRIGGER_ELEMENT  ? (ch)->actual_trigger_element   :  \
 905          (e) == EL_TRIGGER_CE_VALUE ? (ch)->actual_trigger_ce_value  :  \
 906          (e) == EL_TRIGGER_CE_SCORE ? (ch)->actual_trigger_ce_score  :  \
 907          (e) == EL_CURRENT_CE_VALUE ? (cv) :                            \
 908          (e) == EL_CURRENT_CE_SCORE ? (cs) :                            \
 909          (e) >= EL_PREV_CE_8 && (e) <= EL_NEXT_CE_8 ?                   \
 910          RESOLVED_REFERENCE_ELEMENT(be, e) :                            \
 911          (e))
 912
 913 #define CAN_GROW_INTO(e)                                                \
 914         ((e) == EL_SAND || (IS_DIGGABLE(e) && level.grow_into_diggable))
 915
 916 #define ELEMENT_CAN_ENTER_FIELD_BASE_X(x, y, condition)                 \
 917                 (IN_LEV_FIELD(x, y) && (IS_FREE(x, y) ||                \
 918                                         (condition)))
 919
 920 #define ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, condition)              \
 921                 (IN_LEV_FIELD(x, y) && (IS_FREE(x, y) ||                \
 922                                         (CAN_MOVE_INTO_ACID(e) &&       \
 923                                          Feld[x][y] == EL_ACID) ||      \
 924                                         (condition)))
 925
 926 #define ELEMENT_CAN_ENTER_FIELD_BASE_3(e, x, y, condition)              \
 927                 (IN_LEV_FIELD(x, y) && (IS_FREE_OR_PLAYER(x, y) ||      \
 928                                         (CAN_MOVE_INTO_ACID(e) &&       \
 929                                          Feld[x][y] == EL_ACID) ||      \
 930                                         (condition)))
 931
 932 #define ELEMENT_CAN_ENTER_FIELD_BASE_4(e, x, y, condition)              \
 933                 (IN_LEV_FIELD(x, y) && (IS_FREE(x, y) ||                \
 934                                         (condition) ||                  \
 935                                         (CAN_MOVE_INTO_ACID(e) &&       \
 936                                          Feld[x][y] == EL_ACID) ||      \
 937                                         (DONT_COLLIDE_WITH(e) &&        \
 938                                          IS_PLAYER(x, y) &&             \
 939                                          !PLAYER_ENEMY_PROTECTED(x, y))))
 940
 941 #define ELEMENT_CAN_ENTER_FIELD(e, x, y)                                \
 942         ELEMENT_CAN_ENTER_FIELD_BASE_4(e, x, y, 0)
 943
 944 #define SATELLITE_CAN_ENTER_FIELD(x, y)                                 \
 945         ELEMENT_CAN_ENTER_FIELD_BASE_2(EL_SATELLITE, x, y, 0)
 946
 947 #define ANDROID_CAN_ENTER_FIELD(e, x, y)                                \
 948         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, Feld[x][y] == EL_EMC_PLANT)
 949
 950 #define ANDROID_CAN_CLONE_FIELD(x, y)                                   \
 951         (IN_LEV_FIELD(x, y) && (CAN_BE_CLONED_BY_ANDROID(Feld[x][y]) || \
 952                                 CAN_BE_CLONED_BY_ANDROID(EL_TRIGGER_ELEMENT)))
 953
 954 #define ENEMY_CAN_ENTER_FIELD(e, x, y)                                  \
 955         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, 0)
 956
 957 #define YAMYAM_CAN_ENTER_FIELD(e, x, y)                                 \
 958         ELEMENT_CAN_ENTER_FIELD_BASE_3(e, x, y, Feld[x][y] == EL_DIAMOND)
 959
 960 #define DARK_YAMYAM_CAN_ENTER_FIELD(e, x, y)                            \
 961         ELEMENT_CAN_ENTER_FIELD_BASE_3(e, x,y, IS_FOOD_DARK_YAMYAM(Feld[x][y]))
 962
 963 #define PACMAN_CAN_ENTER_FIELD(e, x, y)                                 \
 964         ELEMENT_CAN_ENTER_FIELD_BASE_3(e, x, y, IS_AMOEBOID(Feld[x][y]))
 965
 966 #define PIG_CAN_ENTER_FIELD(e, x, y)                                    \
 967         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, IS_FOOD_PIG(Feld[x][y]))
 968
 969 #define PENGUIN_CAN_ENTER_FIELD(e, x, y)                                \
 970         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, (Feld[x][y] == EL_EXIT_OPEN || \
 971                                                  Feld[x][y] == EL_EM_EXIT_OPEN || \
 972                                                  Feld[x][y] == EL_STEEL_EXIT_OPEN || \
 973                                                  Feld[x][y] == EL_EM_STEEL_EXIT_OPEN || \
 974                                                  IS_FOOD_PENGUIN(Feld[x][y])))
 975 #define DRAGON_CAN_ENTER_FIELD(e, x, y)                                 \
 976         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, 0)
 977
 978 #define MOLE_CAN_ENTER_FIELD(e, x, y, condition)                        \
 979         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, (condition))
 980
 981 #define SPRING_CAN_ENTER_FIELD(e, x, y)                                 \
 982         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, 0)
 983
 984 #define SPRING_CAN_BUMP_FROM_FIELD(x, y)                                \
 985         (IN_LEV_FIELD(x, y) && (Feld[x][y] == EL_EMC_SPRING_BUMPER ||   \
 986                                 Feld[x][y] == EL_EMC_SPRING_BUMPER_ACTIVE))
 987
 988 #define MOVE_ENTER_EL(e)        (element_info[e].move_enter_element)
 989
 990 #define CE_ENTER_FIELD_COND(e, x, y)                                    \
 991                 (!IS_PLAYER(x, y) &&                                    \
 992                  IS_EQUAL_OR_IN_GROUP(Feld[x][y], MOVE_ENTER_EL(e)))
 993
 994 #define CUSTOM_ELEMENT_CAN_ENTER_FIELD(e, x, y)                         \
 995         ELEMENT_CAN_ENTER_FIELD_BASE_4(e, x, y, CE_ENTER_FIELD_COND(e, x, y))
 996
 997 #define IN_LEV_FIELD_AND_IS_FREE(x, y)  (IN_LEV_FIELD(x, y) &&  IS_FREE(x, y))
 998 #define IN_LEV_FIELD_AND_NOT_FREE(x, y) (IN_LEV_FIELD(x, y) && !IS_FREE(x, y))
 999
1000 #define ACCESS_FROM(e, d)               (element_info[e].access_direction &(d))
1001 #define IS_WALKABLE_FROM(e, d)          (IS_WALKABLE(e)   && ACCESS_FROM(e, d))
1002 #define IS_PASSABLE_FROM(e, d)          (IS_PASSABLE(e)   && ACCESS_FROM(e, d))
1003 #define IS_ACCESSIBLE_FROM(e, d)        (IS_ACCESSIBLE(e) && ACCESS_FROM(e, d))
1004
1005 #define MM_HEALTH(x)            (MIN(MAX(0, MAX_HEALTH - (x)), MAX_HEALTH))
1006
1007 /* game button identifiers */
1008 #define GAME_CTRL_ID_STOP               0
1009 #define GAME_CTRL_ID_PAUSE              1
1010 #define GAME_CTRL_ID_PLAY               2
1011 #define GAME_CTRL_ID_UNDO               3
1012 #define GAME_CTRL_ID_REDO               4
1013 #define GAME_CTRL_ID_SAVE               5
1014 #define GAME_CTRL_ID_PAUSE2             6
1015 #define GAME_CTRL_ID_LOAD               7
1016 #define GAME_CTRL_ID_PANEL_STOP         8
1017 #define GAME_CTRL_ID_PANEL_PAUSE        9
1018 #define GAME_CTRL_ID_PANEL_PLAY         10
1019 #define SOUND_CTRL_ID_MUSIC             11
1020 #define SOUND_CTRL_ID_LOOPS             12
1021 #define SOUND_CTRL_ID_SIMPLE            13
1022 #define SOUND_CTRL_ID_PANEL_MUSIC       14
1023 #define SOUND_CTRL_ID_PANEL_LOOPS       15
1024 #define SOUND_CTRL_ID_PANEL_SIMPLE      16
1025
1026 #define NUM_GAME_BUTTONS                17
1027
1028
1029 /* forward declaration for internal use */
1030
1031 static void CreateField(int, int, int);
1032
1033 static void ResetGfxAnimation(int, int);
1034
1035 static void SetPlayerWaiting(struct PlayerInfo *, boolean);
1036 static void AdvanceFrameAndPlayerCounters(int);
1037
1038 static boolean MovePlayerOneStep(struct PlayerInfo *, int, int, int, int);
1039 static boolean MovePlayer(struct PlayerInfo *, int, int);
1040 static void ScrollPlayer(struct PlayerInfo *, int);
1041 static void ScrollScreen(struct PlayerInfo *, int);
1042
1043 static int DigField(struct PlayerInfo *, int, int, int, int, int, int, int);
1044 static boolean DigFieldByCE(int, int, int);
1045 static boolean SnapField(struct PlayerInfo *, int, int);
1046 static boolean DropElement(struct PlayerInfo *);
1047
1048 static void InitBeltMovement(void);
1049 static void CloseAllOpenTimegates(void);
1050 static void CheckGravityMovement(struct PlayerInfo *);
1051 static void CheckGravityMovementWhenNotMoving(struct PlayerInfo *);
1052 static void KillPlayerUnlessEnemyProtected(int, int);
1053 static void KillPlayerUnlessExplosionProtected(int, int);
1054
1055 static void TestIfPlayerTouchesCustomElement(int, int);
1056 static void TestIfElementTouchesCustomElement(int, int);
1057 static void TestIfElementHitsCustomElement(int, int, int);
1058
1059 static void HandleElementChange(int, int, int);
1060 static void ExecuteCustomElementAction(int, int, int, int);
1061 static boolean ChangeElement(int, int, int, int);
1062
1063 static boolean CheckTriggeredElementChangeExt(int, int, int, int, int,int,int);
1064 #define CheckTriggeredElementChange(x, y, e, ev)                        \
1065         CheckTriggeredElementChangeExt(x,y,e,ev, CH_PLAYER_ANY,CH_SIDE_ANY, -1)
1066 #define CheckTriggeredElementChangeByPlayer(x, y, e, ev, p, s)          \
1067         CheckTriggeredElementChangeExt(x, y, e, ev, p, s, -1)
1068 #define CheckTriggeredElementChangeBySide(x, y, e, ev, s)               \
1069         CheckTriggeredElementChangeExt(x, y, e, ev, CH_PLAYER_ANY, s, -1)
1070 #define CheckTriggeredElementChangeByPage(x, y, e, ev, p)               \
1071         CheckTriggeredElementChangeExt(x,y,e,ev, CH_PLAYER_ANY, CH_SIDE_ANY, p)
1072
1073 static boolean CheckElementChangeExt(int, int, int, int, int, int, int);
1074 #define CheckElementChange(x, y, e, te, ev)                             \
1075         CheckElementChangeExt(x, y, e, te, ev, CH_PLAYER_ANY, CH_SIDE_ANY)
1076 #define CheckElementChangeByPlayer(x, y, e, ev, p, s)                   \
1077         CheckElementChangeExt(x, y, e, EL_EMPTY, ev, p, s)
1078 #define CheckElementChangeBySide(x, y, e, te, ev, s)                    \
1079         CheckElementChangeExt(x, y, e, te, ev, CH_PLAYER_ANY, s)
1080
1081 static void PlayLevelSound(int, int, int);
1082 static void PlayLevelSoundNearest(int, int, int);
1083 static void PlayLevelSoundAction(int, int, int);
1084 static void PlayLevelSoundElementAction(int, int, int, int);
1085 static void PlayLevelSoundElementActionIfLoop(int, int, int, int);
1086 static void PlayLevelSoundActionIfLoop(int, int, int);
1087 static void StopLevelSoundActionIfLoop(int, int, int);
1088 static void PlayLevelMusic();
1089 static void FadeLevelSoundsAndMusic();
1090
1091 static void HandleGameButtons(struct GadgetInfo *);
1092
1093 int AmoebeNachbarNr(int, int);
1094 void AmoebeUmwandeln(int, int);
1095 void ContinueMoving(int, int);
1096 void Bang(int, int);
1097 void InitMovDir(int, int);
1098 void InitAmoebaNr(int, int);
1099 int NewHiScore(int);
1100
1101 void TestIfGoodThingHitsBadThing(int, int, int);
1102 void TestIfBadThingHitsGoodThing(int, int, int);
1103 void TestIfPlayerTouchesBadThing(int, int);
1104 void TestIfPlayerRunsIntoBadThing(int, int, int);
1105 void TestIfBadThingTouchesPlayer(int, int);
1106 void TestIfBadThingRunsIntoPlayer(int, int, int);
1107 void TestIfFriendTouchesBadThing(int, int);
1108 void TestIfBadThingTouchesFriend(int, int);
1109 void TestIfBadThingTouchesOtherBadThing(int, int);
1110 void TestIfGoodThingGetsHitByBadThing(int, int, int);
1111
1112 void KillPlayer(struct PlayerInfo *);
1113 void BuryPlayer(struct PlayerInfo *);
1114 void RemovePlayer(struct PlayerInfo *);
1115 void ExitPlayer(struct PlayerInfo *);
1116
1117 static int getInvisibleActiveFromInvisibleElement(int);
1118 static int getInvisibleFromInvisibleActiveElement(int);
1119
1120 static struct GadgetInfo *game_gadget[NUM_GAME_BUTTONS];
1121
1122 /* for detection of endless loops, caused by custom element programming */
1123 /* (using maximal playfield width x 10 is just a rough approximation) */
1124 #define MAX_ELEMENT_CHANGE_RECURSION_DEPTH      (MAX_PLAYFIELD_WIDTH * 10)
1125
1126 #define RECURSION_LOOP_DETECTION_START(e, rc)                           \
1127 {                                                                       \
1128   if (recursion_loop_detected)                                          \
1129     return (rc);                                                        \
1130                                                                         \
1131   if (recursion_loop_depth > MAX_ELEMENT_CHANGE_RECURSION_DEPTH)        \
1132   {                                                                     \
1133     recursion_loop_detected = TRUE;                                     \
1134     recursion_loop_element = (e);                                       \
1135   }                                                                     \
1136                                                                         \
1137   recursion_loop_depth++;                                               \
1138 }
1139
1140 #define RECURSION_LOOP_DETECTION_END()                                  \
1141 {                                                                       \
1142   recursion_loop_depth--;                                               \
1143 }
1144
1145 static int recursion_loop_depth;
1146 static boolean recursion_loop_detected;
1147 static boolean recursion_loop_element;
1148
1149 static int map_player_action[MAX_PLAYERS];
1150
1151
1152 /* ------------------------------------------------------------------------- */
1153 /* definition of elements that automatically change to other elements after  */
1154 /* a specified time, eventually calling a function when changing             */
1155 /* ------------------------------------------------------------------------- */
1156
1157 /* forward declaration for changer functions */
1158 static void InitBuggyBase(int, int);
1159 static void WarnBuggyBase(int, int);
1160
1161 static void InitTrap(int, int);
1162 static void ActivateTrap(int, int);
1163 static void ChangeActiveTrap(int, int);
1164
1165 static void InitRobotWheel(int, int);
1166 static void RunRobotWheel(int, int);
1167 static void StopRobotWheel(int, int);
1168
1169 static void InitTimegateWheel(int, int);
1170 static void RunTimegateWheel(int, int);
1171
1172 static void InitMagicBallDelay(int, int);
1173 static void ActivateMagicBall(int, int);
1174
1175 struct ChangingElementInfo
1176 {
1177   int element;
1178   int target_element;
1179   int change_delay;
1180   void (*pre_change_function)(int x, int y);
1181   void (*change_function)(int x, int y);
1182   void (*post_change_function)(int x, int y);
1183 };
1184
1185 static struct ChangingElementInfo change_delay_list[] =
1186 {
1187   {
1188     EL_NUT_BREAKING,
1189     EL_EMERALD,
1190     6,
1191     NULL,
1192     NULL,
1193     NULL
1194   },
1195   {
1196     EL_PEARL_BREAKING,
1197     EL_EMPTY,
1198     8,
1199     NULL,
1200     NULL,
1201     NULL
1202   },
1203   {
1204     EL_EXIT_OPENING,
1205     EL_EXIT_OPEN,
1206     29,
1207     NULL,
1208     NULL,
1209     NULL
1210   },
1211   {
1212     EL_EXIT_CLOSING,
1213     EL_EXIT_CLOSED,
1214     29,
1215     NULL,
1216     NULL,
1217     NULL
1218   },
1219   {
1220     EL_STEEL_EXIT_OPENING,
1221     EL_STEEL_EXIT_OPEN,
1222     29,
1223     NULL,
1224     NULL,
1225     NULL
1226   },
1227   {
1228     EL_STEEL_EXIT_CLOSING,
1229     EL_STEEL_EXIT_CLOSED,
1230     29,
1231     NULL,
1232     NULL,
1233     NULL
1234   },
1235   {
1236     EL_EM_EXIT_OPENING,
1237     EL_EM_EXIT_OPEN,
1238     29,
1239     NULL,
1240     NULL,
1241     NULL
1242   },
1243   {
1244     EL_EM_EXIT_CLOSING,
1245     EL_EMPTY,
1246     29,
1247     NULL,
1248     NULL,
1249     NULL
1250   },
1251   {
1252     EL_EM_STEEL_EXIT_OPENING,
1253     EL_EM_STEEL_EXIT_OPEN,
1254     29,
1255     NULL,
1256     NULL,
1257     NULL
1258   },
1259   {
1260     EL_EM_STEEL_EXIT_CLOSING,
1261     EL_STEELWALL,
1262     29,
1263     NULL,
1264     NULL,
1265     NULL
1266   },
1267   {
1268     EL_SP_EXIT_OPENING,
1269     EL_SP_EXIT_OPEN,
1270     29,
1271     NULL,
1272     NULL,
1273     NULL
1274   },
1275   {
1276     EL_SP_EXIT_CLOSING,
1277     EL_SP_EXIT_CLOSED,
1278     29,
1279     NULL,
1280     NULL,
1281     NULL
1282   },
1283   {
1284     EL_SWITCHGATE_OPENING,
1285     EL_SWITCHGATE_OPEN,
1286     29,
1287     NULL,
1288     NULL,
1289     NULL
1290   },
1291   {
1292     EL_SWITCHGATE_CLOSING,
1293     EL_SWITCHGATE_CLOSED,
1294     29,
1295     NULL,
1296     NULL,
1297     NULL
1298   },
1299   {
1300     EL_TIMEGATE_OPENING,
1301     EL_TIMEGATE_OPEN,
1302     29,
1303     NULL,
1304     NULL,
1305     NULL
1306   },
1307   {
1308     EL_TIMEGATE_CLOSING,
1309     EL_TIMEGATE_CLOSED,
1310     29,
1311     NULL,
1312     NULL,
1313     NULL
1314   },
1315
1316   {
1317     EL_ACID_SPLASH_LEFT,
1318     EL_EMPTY,
1319     8,
1320     NULL,
1321     NULL,
1322     NULL
1323   },
1324   {
1325     EL_ACID_SPLASH_RIGHT,
1326     EL_EMPTY,
1327     8,
1328     NULL,
1329     NULL,
1330     NULL
1331   },
1332   {
1333     EL_SP_BUGGY_BASE,
1334     EL_SP_BUGGY_BASE_ACTIVATING,
1335     0,
1336     InitBuggyBase,
1337     NULL,
1338     NULL
1339   },
1340   {
1341     EL_SP_BUGGY_BASE_ACTIVATING,
1342     EL_SP_BUGGY_BASE_ACTIVE,
1343     0,
1344     InitBuggyBase,
1345     NULL,
1346     NULL
1347   },
1348   {
1349     EL_SP_BUGGY_BASE_ACTIVE,
1350     EL_SP_BUGGY_BASE,
1351     0,
1352     InitBuggyBase,
1353     WarnBuggyBase,
1354     NULL
1355   },
1356   {
1357     EL_TRAP,
1358     EL_TRAP_ACTIVE,
1359     0,
1360     InitTrap,
1361     NULL,
1362     ActivateTrap
1363   },
1364   {
1365     EL_TRAP_ACTIVE,
1366     EL_TRAP,
1367     31,
1368     NULL,
1369     ChangeActiveTrap,
1370     NULL
1371   },
1372   {
1373     EL_ROBOT_WHEEL_ACTIVE,
1374     EL_ROBOT_WHEEL,
1375     0,
1376     InitRobotWheel,
1377     RunRobotWheel,
1378     StopRobotWheel
1379   },
1380   {
1381     EL_TIMEGATE_SWITCH_ACTIVE,
1382     EL_TIMEGATE_SWITCH,
1383     0,
1384     InitTimegateWheel,
1385     RunTimegateWheel,
1386     NULL
1387   },
1388   {
1389     EL_DC_TIMEGATE_SWITCH_ACTIVE,
1390     EL_DC_TIMEGATE_SWITCH,
1391     0,
1392     InitTimegateWheel,
1393     RunTimegateWheel,
1394     NULL
1395   },
1396   {
1397     EL_EMC_MAGIC_BALL_ACTIVE,
1398     EL_EMC_MAGIC_BALL_ACTIVE,
1399     0,
1400     InitMagicBallDelay,
1401     NULL,
1402     ActivateMagicBall
1403   },
1404   {
1405     EL_EMC_SPRING_BUMPER_ACTIVE,
1406     EL_EMC_SPRING_BUMPER,
1407     8,
1408     NULL,
1409     NULL,
1410     NULL
1411   },
1412   {
1413     EL_DIAGONAL_SHRINKING,
1414     EL_UNDEFINED,
1415     0,
1416     NULL,
1417     NULL,
1418     NULL
1419   },
1420   {
1421     EL_DIAGONAL_GROWING,
1422     EL_UNDEFINED,
1423     0,
1424     NULL,
1425     NULL,
1426     NULL,
1427   },
1428
1429   {
1430     EL_UNDEFINED,
1431     EL_UNDEFINED,
1432     -1,
1433     NULL,
1434     NULL,
1435     NULL
1436   }
1437 };
1438
1439 struct
1440 {
1441   int element;
1442   int push_delay_fixed, push_delay_random;
1443 }
1444 push_delay_list[] =
1445 {
1446   { EL_SPRING,                  0, 0 },
1447   { EL_BALLOON,                 0, 0 },
1448
1449   { EL_SOKOBAN_OBJECT,          2, 0 },
1450   { EL_SOKOBAN_FIELD_FULL,      2, 0 },
1451   { EL_SATELLITE,               2, 0 },
1452   { EL_SP_DISK_YELLOW,          2, 0 },
1453
1454   { EL_UNDEFINED,               0, 0 },
1455 };
1456
1457 struct
1458 {
1459   int element;
1460   int move_stepsize;
1461 }
1462 move_stepsize_list[] =
1463 {
1464   { EL_AMOEBA_DROP,             2 },
1465   { EL_AMOEBA_DROPPING,         2 },
1466   { EL_QUICKSAND_FILLING,       1 },
1467   { EL_QUICKSAND_EMPTYING,      1 },
1468   { EL_QUICKSAND_FAST_FILLING,  2 },
1469   { EL_QUICKSAND_FAST_EMPTYING, 2 },
1470   { EL_MAGIC_WALL_FILLING,      2 },
1471   { EL_MAGIC_WALL_EMPTYING,     2 },
1472   { EL_BD_MAGIC_WALL_FILLING,   2 },
1473   { EL_BD_MAGIC_WALL_EMPTYING,  2 },
1474   { EL_DC_MAGIC_WALL_FILLING,   2 },
1475   { EL_DC_MAGIC_WALL_EMPTYING,  2 },
1476
1477   { EL_UNDEFINED,               0 },
1478 };
1479
1480 struct
1481 {
1482   int element;
1483   int count;
1484 }
1485 collect_count_list[] =
1486 {
1487   { EL_EMERALD,                 1 },
1488   { EL_BD_DIAMOND,              1 },
1489   { EL_EMERALD_YELLOW,          1 },
1490   { EL_EMERALD_RED,             1 },
1491   { EL_EMERALD_PURPLE,          1 },
1492   { EL_DIAMOND,                 3 },
1493   { EL_SP_INFOTRON,             1 },
1494   { EL_PEARL,                   5 },
1495   { EL_CRYSTAL,                 8 },
1496
1497   { EL_UNDEFINED,               0 },
1498 };
1499
1500 struct
1501 {
1502   int element;
1503   int direction;
1504 }
1505 access_direction_list[] =
1506 {
1507   { EL_TUBE_ANY,                        MV_LEFT | MV_RIGHT | MV_UP | MV_DOWN },
1508   { EL_TUBE_VERTICAL,                                        MV_UP | MV_DOWN },
1509   { EL_TUBE_HORIZONTAL,                 MV_LEFT | MV_RIGHT                   },
1510   { EL_TUBE_VERTICAL_LEFT,              MV_LEFT |            MV_UP | MV_DOWN },
1511   { EL_TUBE_VERTICAL_RIGHT,                       MV_RIGHT | MV_UP | MV_DOWN },
1512   { EL_TUBE_HORIZONTAL_UP,              MV_LEFT | MV_RIGHT | MV_UP           },
1513   { EL_TUBE_HORIZONTAL_DOWN,            MV_LEFT | MV_RIGHT |         MV_DOWN },
1514   { EL_TUBE_LEFT_UP,                    MV_LEFT |            MV_UP           },
1515   { EL_TUBE_LEFT_DOWN,                  MV_LEFT |                    MV_DOWN },
1516   { EL_TUBE_RIGHT_UP,                             MV_RIGHT | MV_UP           },
1517   { EL_TUBE_RIGHT_DOWN,                           MV_RIGHT |         MV_DOWN },
1518
1519   { EL_SP_PORT_LEFT,                              MV_RIGHT                   },
1520   { EL_SP_PORT_RIGHT,                   MV_LEFT                              },
1521   { EL_SP_PORT_UP,                                                   MV_DOWN },
1522   { EL_SP_PORT_DOWN,                                         MV_UP           },
1523   { EL_SP_PORT_HORIZONTAL,              MV_LEFT | MV_RIGHT                   },
1524   { EL_SP_PORT_VERTICAL,                                     MV_UP | MV_DOWN },
1525   { EL_SP_PORT_ANY,                     MV_LEFT | MV_RIGHT | MV_UP | MV_DOWN },
1526   { EL_SP_GRAVITY_PORT_LEFT,                      MV_RIGHT                   },
1527   { EL_SP_GRAVITY_PORT_RIGHT,           MV_LEFT                              },
1528   { EL_SP_GRAVITY_PORT_UP,                                           MV_DOWN },
1529   { EL_SP_GRAVITY_PORT_DOWN,                                 MV_UP           },
1530   { EL_SP_GRAVITY_ON_PORT_LEFT,                   MV_RIGHT                   },
1531   { EL_SP_GRAVITY_ON_PORT_RIGHT,        MV_LEFT                              },
1532   { EL_SP_GRAVITY_ON_PORT_UP,                                        MV_DOWN },
1533   { EL_SP_GRAVITY_ON_PORT_DOWN,                              MV_UP           },
1534   { EL_SP_GRAVITY_OFF_PORT_LEFT,                  MV_RIGHT                   },
1535   { EL_SP_GRAVITY_OFF_PORT_RIGHT,       MV_LEFT                              },
1536   { EL_SP_GRAVITY_OFF_PORT_UP,                                       MV_DOWN },
1537   { EL_SP_GRAVITY_OFF_PORT_DOWN,                             MV_UP           },
1538
1539   { EL_UNDEFINED,                       MV_NONE                              }
1540 };
1541
1542 static boolean trigger_events[MAX_NUM_ELEMENTS][NUM_CHANGE_EVENTS];
1543
1544 #define IS_AUTO_CHANGING(e)     (element_info[e].has_change_event[CE_DELAY])
1545 #define IS_JUST_CHANGING(x, y)  (ChangeDelay[x][y] != 0)
1546 #define IS_CHANGING(x, y)       (IS_AUTO_CHANGING(Feld[x][y]) || \
1547                                  IS_JUST_CHANGING(x, y))
1548
1549 #define CE_PAGE(e, ce)          (element_info[e].event_page[ce])
1550
1551 /* static variables for playfield scan mode (scanning forward or backward) */
1552 static int playfield_scan_start_x = 0;
1553 static int playfield_scan_start_y = 0;
1554 static int playfield_scan_delta_x = 1;
1555 static int playfield_scan_delta_y = 1;
1556
1557 #define SCAN_PLAYFIELD(x, y)    for ((y) = playfield_scan_start_y;      \
1558                                      (y) >= 0 && (y) <= lev_fieldy - 1; \
1559                                      (y) += playfield_scan_delta_y)     \
1560                                 for ((x) = playfield_scan_start_x;      \
1561                                      (x) >= 0 && (x) <= lev_fieldx - 1; \
1562                                      (x) += playfield_scan_delta_x)
1563
1564 #ifdef DEBUG
1565 void DEBUG_SetMaximumDynamite()
1566 {
1567   int i;
1568
1569   for (i = 0; i < MAX_INVENTORY_SIZE; i++)
1570     if (local_player->inventory_size < MAX_INVENTORY_SIZE)
1571       local_player->inventory_element[local_player->inventory_size++] =
1572         EL_DYNAMITE;
1573 }
1574 #endif
1575
1576 static void InitPlayfieldScanModeVars()
1577 {
1578   if (game.use_reverse_scan_direction)
1579   {
1580     playfield_scan_start_x = lev_fieldx - 1;
1581     playfield_scan_start_y = lev_fieldy - 1;
1582
1583     playfield_scan_delta_x = -1;
1584     playfield_scan_delta_y = -1;
1585   }
1586   else
1587   {
1588     playfield_scan_start_x = 0;
1589     playfield_scan_start_y = 0;
1590
1591     playfield_scan_delta_x = 1;
1592     playfield_scan_delta_y = 1;
1593   }
1594 }
1595
1596 static void InitPlayfieldScanMode(int mode)
1597 {
1598   game.use_reverse_scan_direction =
1599     (mode == CA_ARG_SCAN_MODE_REVERSE ? TRUE : FALSE);
1600
1601   InitPlayfieldScanModeVars();
1602 }
1603
1604 static int get_move_delay_from_stepsize(int move_stepsize)
1605 {
1606   move_stepsize =
1607     MIN(MAX(MOVE_STEPSIZE_MIN, move_stepsize), MOVE_STEPSIZE_MAX);
1608
1609   /* make sure that stepsize value is always a power of 2 */
1610   move_stepsize = (1 << log_2(move_stepsize));
1611
1612   return TILEX / move_stepsize;
1613 }
1614
1615 static void SetPlayerMoveSpeed(struct PlayerInfo *player, int move_stepsize,
1616                                boolean init_game)
1617 {
1618   int player_nr = player->index_nr;
1619   int move_delay = get_move_delay_from_stepsize(move_stepsize);
1620   boolean cannot_move = (move_stepsize == STEPSIZE_NOT_MOVING ? TRUE : FALSE);
1621
1622   /* do no immediately change move delay -- the player might just be moving */
1623   player->move_delay_value_next = move_delay;
1624
1625   /* information if player can move must be set separately */
1626   player->cannot_move = cannot_move;
1627
1628   if (init_game)
1629   {
1630     player->move_delay       = game.initial_move_delay[player_nr];
1631     player->move_delay_value = game.initial_move_delay_value[player_nr];
1632
1633     player->move_delay_value_next = -1;
1634
1635     player->move_delay_reset_counter = 0;
1636   }
1637 }
1638
1639 void GetPlayerConfig()
1640 {
1641   GameFrameDelay = setup.game_frame_delay;
1642
1643   if (!audio.sound_available)
1644     setup.sound_simple = FALSE;
1645
1646   if (!audio.loops_available)
1647     setup.sound_loops = FALSE;
1648
1649   if (!audio.music_available)
1650     setup.sound_music = FALSE;
1651
1652   if (!video.fullscreen_available)
1653     setup.fullscreen = FALSE;
1654
1655   setup.sound = (setup.sound_simple || setup.sound_loops || setup.sound_music);
1656
1657   SetAudioMode(setup.sound);
1658 }
1659
1660 int GetElementFromGroupElement(int element)
1661 {
1662   if (IS_GROUP_ELEMENT(element))
1663   {
1664     struct ElementGroupInfo *group = element_info[element].group;
1665     int last_anim_random_frame = gfx.anim_random_frame;
1666     int element_pos;
1667
1668     if (group->choice_mode == ANIM_RANDOM)
1669       gfx.anim_random_frame = RND(group->num_elements_resolved);
1670
1671     element_pos = getAnimationFrame(group->num_elements_resolved, 1,
1672                                     group->choice_mode, 0,
1673                                     group->choice_pos);
1674
1675     if (group->choice_mode == ANIM_RANDOM)
1676       gfx.anim_random_frame = last_anim_random_frame;
1677
1678     group->choice_pos++;
1679
1680     element = group->element_resolved[element_pos];
1681   }
1682
1683   return element;
1684 }
1685
1686 static void InitPlayerField(int x, int y, int element, boolean init_game)
1687 {
1688   if (element == EL_SP_MURPHY)
1689   {
1690     if (init_game)
1691     {
1692       if (stored_player[0].present)
1693       {
1694         Feld[x][y] = EL_SP_MURPHY_CLONE;
1695
1696         return;
1697       }
1698       else
1699       {
1700         stored_player[0].initial_element = element;
1701         stored_player[0].use_murphy = TRUE;
1702
1703         if (!level.use_artwork_element[0])
1704           stored_player[0].artwork_element = EL_SP_MURPHY;
1705       }
1706
1707       Feld[x][y] = EL_PLAYER_1;
1708     }
1709   }
1710
1711   if (init_game)
1712   {
1713     struct PlayerInfo *player = &stored_player[Feld[x][y] - EL_PLAYER_1];
1714     int jx = player->jx, jy = player->jy;
1715
1716     player->present = TRUE;
1717
1718     player->block_last_field = (element == EL_SP_MURPHY ?
1719                                 level.sp_block_last_field :
1720                                 level.block_last_field);
1721
1722     /* ---------- initialize player's last field block delay --------------- */
1723
1724     /* always start with reliable default value (no adjustment needed) */
1725     player->block_delay_adjustment = 0;
1726
1727     /* special case 1: in Supaplex, Murphy blocks last field one more frame */
1728     if (player->block_last_field && element == EL_SP_MURPHY)
1729       player->block_delay_adjustment = 1;
1730
1731     /* special case 2: in game engines before 3.1.1, blocking was different */
1732     if (game.use_block_last_field_bug)
1733       player->block_delay_adjustment = (player->block_last_field ? -1 : 1);
1734
1735     if (!network.enabled || player->connected_network)
1736     {
1737       player->active = TRUE;
1738
1739       /* remove potentially duplicate players */
1740       if (StorePlayer[jx][jy] == Feld[x][y])
1741         StorePlayer[jx][jy] = 0;
1742
1743       StorePlayer[x][y] = Feld[x][y];
1744
1745 #if DEBUG_INIT_PLAYER
1746       if (options.debug)
1747       {
1748         printf("- player element %d activated", player->element_nr);
1749         printf(" (local player is %d and currently %s)\n",
1750                local_player->element_nr,
1751                local_player->active ? "active" : "not active");
1752       }
1753     }
1754 #endif
1755
1756     Feld[x][y] = EL_EMPTY;
1757
1758     player->jx = player->last_jx = x;
1759     player->jy = player->last_jy = y;
1760   }
1761
1762   if (!init_game)
1763   {
1764     int player_nr = GET_PLAYER_NR(element);
1765     struct PlayerInfo *player = &stored_player[player_nr];
1766
1767     if (player->active && player->killed)
1768       player->reanimated = TRUE; /* if player was just killed, reanimate him */
1769   }
1770 }
1771
1772 static void InitField(int x, int y, boolean init_game)
1773 {
1774   int element = Feld[x][y];
1775
1776   switch (element)
1777   {
1778     case EL_SP_MURPHY:
1779     case EL_PLAYER_1:
1780     case EL_PLAYER_2:
1781     case EL_PLAYER_3:
1782     case EL_PLAYER_4:
1783       InitPlayerField(x, y, element, init_game);
1784       break;
1785
1786     case EL_SOKOBAN_FIELD_PLAYER:
1787       element = Feld[x][y] = EL_PLAYER_1;
1788       InitField(x, y, init_game);
1789
1790       element = Feld[x][y] = EL_SOKOBAN_FIELD_EMPTY;
1791       InitField(x, y, init_game);
1792       break;
1793
1794     case EL_SOKOBAN_FIELD_EMPTY:
1795       local_player->sokobanfields_still_needed++;
1796       break;
1797
1798     case EL_STONEBLOCK:
1799       if (x < lev_fieldx-1 && Feld[x+1][y] == EL_ACID)
1800         Feld[x][y] = EL_ACID_POOL_TOPLEFT;
1801       else if (x > 0 && Feld[x-1][y] == EL_ACID)
1802         Feld[x][y] = EL_ACID_POOL_TOPRIGHT;
1803       else if (y > 0 && Feld[x][y-1] == EL_ACID_POOL_TOPLEFT)
1804         Feld[x][y] = EL_ACID_POOL_BOTTOMLEFT;
1805       else if (y > 0 && Feld[x][y-1] == EL_ACID)
1806         Feld[x][y] = EL_ACID_POOL_BOTTOM;
1807       else if (y > 0 && Feld[x][y-1] == EL_ACID_POOL_TOPRIGHT)
1808         Feld[x][y] = EL_ACID_POOL_BOTTOMRIGHT;
1809       break;
1810
1811     case EL_BUG:
1812     case EL_BUG_RIGHT:
1813     case EL_BUG_UP:
1814     case EL_BUG_LEFT:
1815     case EL_BUG_DOWN:
1816     case EL_SPACESHIP:
1817     case EL_SPACESHIP_RIGHT:
1818     case EL_SPACESHIP_UP:
1819     case EL_SPACESHIP_LEFT:
1820     case EL_SPACESHIP_DOWN:
1821     case EL_BD_BUTTERFLY:
1822     case EL_BD_BUTTERFLY_RIGHT:
1823     case EL_BD_BUTTERFLY_UP:
1824     case EL_BD_BUTTERFLY_LEFT:
1825     case EL_BD_BUTTERFLY_DOWN:
1826     case EL_BD_FIREFLY:
1827     case EL_BD_FIREFLY_RIGHT:
1828     case EL_BD_FIREFLY_UP:
1829     case EL_BD_FIREFLY_LEFT:
1830     case EL_BD_FIREFLY_DOWN:
1831     case EL_PACMAN_RIGHT:
1832     case EL_PACMAN_UP:
1833     case EL_PACMAN_LEFT:
1834     case EL_PACMAN_DOWN:
1835     case EL_YAMYAM:
1836     case EL_YAMYAM_LEFT:
1837     case EL_YAMYAM_RIGHT:
1838     case EL_YAMYAM_UP:
1839     case EL_YAMYAM_DOWN:
1840     case EL_DARK_YAMYAM:
1841     case EL_ROBOT:
1842     case EL_PACMAN:
1843     case EL_SP_SNIKSNAK:
1844     case EL_SP_ELECTRON:
1845     case EL_MOLE:
1846     case EL_MOLE_LEFT:
1847     case EL_MOLE_RIGHT:
1848     case EL_MOLE_UP:
1849     case EL_MOLE_DOWN:
1850       InitMovDir(x, y);
1851       break;
1852
1853     case EL_AMOEBA_FULL:
1854     case EL_BD_AMOEBA:
1855       InitAmoebaNr(x, y);
1856       break;
1857
1858     case EL_AMOEBA_DROP:
1859       if (y == lev_fieldy - 1)
1860       {
1861         Feld[x][y] = EL_AMOEBA_GROWING;
1862         Store[x][y] = EL_AMOEBA_WET;
1863       }
1864       break;
1865
1866     case EL_DYNAMITE_ACTIVE:
1867     case EL_SP_DISK_RED_ACTIVE:
1868     case EL_DYNABOMB_PLAYER_1_ACTIVE:
1869     case EL_DYNABOMB_PLAYER_2_ACTIVE:
1870     case EL_DYNABOMB_PLAYER_3_ACTIVE:
1871     case EL_DYNABOMB_PLAYER_4_ACTIVE:
1872       MovDelay[x][y] = 96;
1873       break;
1874
1875     case EL_EM_DYNAMITE_ACTIVE:
1876       MovDelay[x][y] = 32;
1877       break;
1878
1879     case EL_LAMP:
1880       local_player->lights_still_needed++;
1881       break;
1882
1883     case EL_PENGUIN:
1884       local_player->friends_still_needed++;
1885       break;
1886
1887     case EL_PIG:
1888     case EL_DRAGON:
1889       GfxDir[x][y] = MovDir[x][y] = 1 << RND(4);
1890       break;
1891
1892     case EL_CONVEYOR_BELT_1_SWITCH_LEFT:
1893     case EL_CONVEYOR_BELT_1_SWITCH_MIDDLE:
1894     case EL_CONVEYOR_BELT_1_SWITCH_RIGHT:
1895     case EL_CONVEYOR_BELT_2_SWITCH_LEFT:
1896     case EL_CONVEYOR_BELT_2_SWITCH_MIDDLE:
1897     case EL_CONVEYOR_BELT_2_SWITCH_RIGHT:
1898     case EL_CONVEYOR_BELT_3_SWITCH_LEFT:
1899     case EL_CONVEYOR_BELT_3_SWITCH_MIDDLE:
1900     case EL_CONVEYOR_BELT_3_SWITCH_RIGHT:
1901     case EL_CONVEYOR_BELT_4_SWITCH_LEFT:
1902     case EL_CONVEYOR_BELT_4_SWITCH_MIDDLE:
1903     case EL_CONVEYOR_BELT_4_SWITCH_RIGHT:
1904       if (init_game)
1905       {
1906         int belt_nr = getBeltNrFromBeltSwitchElement(Feld[x][y]);
1907         int belt_dir = getBeltDirFromBeltSwitchElement(Feld[x][y]);
1908         int belt_dir_nr = getBeltDirNrFromBeltSwitchElement(Feld[x][y]);
1909
1910         if (game.belt_dir_nr[belt_nr] == 3)     /* initial value */
1911         {
1912           game.belt_dir[belt_nr] = belt_dir;
1913           game.belt_dir_nr[belt_nr] = belt_dir_nr;
1914         }
1915         else    /* more than one switch -- set it like the first switch */
1916         {
1917           Feld[x][y] = Feld[x][y] - belt_dir_nr + game.belt_dir_nr[belt_nr];
1918         }
1919       }
1920       break;
1921
1922     case EL_LIGHT_SWITCH_ACTIVE:
1923       if (init_game)
1924         game.light_time_left = level.time_light * FRAMES_PER_SECOND;
1925       break;
1926
1927     case EL_INVISIBLE_STEELWALL:
1928     case EL_INVISIBLE_WALL:
1929     case EL_INVISIBLE_SAND:
1930       if (game.light_time_left > 0 ||
1931           game.lenses_time_left > 0)
1932         Feld[x][y] = getInvisibleActiveFromInvisibleElement(element);
1933       break;
1934
1935     case EL_EMC_MAGIC_BALL:
1936       if (game.ball_state)
1937         Feld[x][y] = EL_EMC_MAGIC_BALL_ACTIVE;
1938       break;
1939
1940     case EL_EMC_MAGIC_BALL_SWITCH:
1941       if (game.ball_state)
1942         Feld[x][y] = EL_EMC_MAGIC_BALL_SWITCH_ACTIVE;
1943       break;
1944
1945     case EL_TRIGGER_PLAYER:
1946     case EL_TRIGGER_ELEMENT:
1947     case EL_TRIGGER_CE_VALUE:
1948     case EL_TRIGGER_CE_SCORE:
1949     case EL_SELF:
1950     case EL_ANY_ELEMENT:
1951     case EL_CURRENT_CE_VALUE:
1952     case EL_CURRENT_CE_SCORE:
1953     case EL_PREV_CE_1:
1954     case EL_PREV_CE_2:
1955     case EL_PREV_CE_3:
1956     case EL_PREV_CE_4:
1957     case EL_PREV_CE_5:
1958     case EL_PREV_CE_6:
1959     case EL_PREV_CE_7:
1960     case EL_PREV_CE_8:
1961     case EL_NEXT_CE_1:
1962     case EL_NEXT_CE_2:
1963     case EL_NEXT_CE_3:
1964     case EL_NEXT_CE_4:
1965     case EL_NEXT_CE_5:
1966     case EL_NEXT_CE_6:
1967     case EL_NEXT_CE_7:
1968     case EL_NEXT_CE_8:
1969       /* reference elements should not be used on the playfield */
1970       Feld[x][y] = EL_EMPTY;
1971       break;
1972
1973     default:
1974       if (IS_CUSTOM_ELEMENT(element))
1975       {
1976         if (CAN_MOVE(element))
1977           InitMovDir(x, y);
1978
1979         if (!element_info[element].use_last_ce_value || init_game)
1980           CustomValue[x][y] = GET_NEW_CE_VALUE(Feld[x][y]);
1981       }
1982       else if (IS_GROUP_ELEMENT(element))
1983       {
1984         Feld[x][y] = GetElementFromGroupElement(element);
1985
1986         InitField(x, y, init_game);
1987       }
1988
1989       break;
1990   }
1991
1992   if (!init_game)
1993     CheckTriggeredElementChange(x, y, element, CE_CREATION_OF_X);
1994 }
1995
1996 inline static void InitField_WithBug1(int x, int y, boolean init_game)
1997 {
1998   InitField(x, y, init_game);
1999
2000   /* not needed to call InitMovDir() -- already done by InitField()! */
2001   if (game.engine_version < VERSION_IDENT(3,1,0,0) &&
2002       CAN_MOVE(Feld[x][y]))
2003     InitMovDir(x, y);
2004 }
2005
2006 inline static void InitField_WithBug2(int x, int y, boolean init_game)
2007 {
2008   int old_element = Feld[x][y];
2009
2010   InitField(x, y, init_game);
2011
2012   /* not needed to call InitMovDir() -- already done by InitField()! */
2013   if (game.engine_version < VERSION_IDENT(3,1,0,0) &&
2014       CAN_MOVE(old_element) &&
2015       (old_element < EL_MOLE_LEFT || old_element > EL_MOLE_DOWN))
2016     InitMovDir(x, y);
2017
2018   /* this case is in fact a combination of not less than three bugs:
2019      first, it calls InitMovDir() for elements that can move, although this is
2020      already done by InitField(); then, it checks the element that was at this
2021      field _before_ the call to InitField() (which can change it); lastly, it
2022      was not called for "mole with direction" elements, which were treated as
2023      "cannot move" due to (fixed) wrong element initialization in "src/init.c"
2024   */
2025 }
2026
2027 static int get_key_element_from_nr(int key_nr)
2028 {
2029   int key_base_element = (key_nr >= STD_NUM_KEYS ? EL_EMC_KEY_5 - STD_NUM_KEYS :
2030                           level.game_engine_type == GAME_ENGINE_TYPE_EM ?
2031                           EL_EM_KEY_1 : EL_KEY_1);
2032
2033   return key_base_element + key_nr;
2034 }
2035
2036 static int get_next_dropped_element(struct PlayerInfo *player)
2037 {
2038   return (player->inventory_size > 0 ?
2039           player->inventory_element[player->inventory_size - 1] :
2040           player->inventory_infinite_element != EL_UNDEFINED ?
2041           player->inventory_infinite_element :
2042           player->dynabombs_left > 0 ?
2043           EL_DYNABOMB_PLAYER_1_ACTIVE + player->index_nr :
2044           EL_UNDEFINED);
2045 }
2046
2047 static int get_inventory_element_from_pos(struct PlayerInfo *player, int pos)
2048 {
2049   /* pos >= 0: get element from bottom of the stack;
2050      pos <  0: get element from top of the stack */
2051
2052   if (pos < 0)
2053   {
2054     int min_inventory_size = -pos;
2055     int inventory_pos = player->inventory_size - min_inventory_size;
2056     int min_dynabombs_left = min_inventory_size - player->inventory_size;
2057
2058     return (player->inventory_size >= min_inventory_size ?
2059             player->inventory_element[inventory_pos] :
2060             player->inventory_infinite_element != EL_UNDEFINED ?
2061             player->inventory_infinite_element :
2062             player->dynabombs_left >= min_dynabombs_left ?
2063             EL_DYNABOMB_PLAYER_1 + player->index_nr :
2064             EL_UNDEFINED);
2065   }
2066   else
2067   {
2068     int min_dynabombs_left = pos + 1;
2069     int min_inventory_size = pos + 1 - player->dynabombs_left;
2070     int inventory_pos = pos - player->dynabombs_left;
2071
2072     return (player->inventory_infinite_element != EL_UNDEFINED ?
2073             player->inventory_infinite_element :
2074             player->dynabombs_left >= min_dynabombs_left ?
2075             EL_DYNABOMB_PLAYER_1 + player->index_nr :
2076             player->inventory_size >= min_inventory_size ?
2077             player->inventory_element[inventory_pos] :
2078             EL_UNDEFINED);
2079   }
2080 }
2081
2082 static int compareGamePanelOrderInfo(const void *object1, const void *object2)
2083 {
2084   const struct GamePanelOrderInfo *gpo1 = (struct GamePanelOrderInfo *)object1;
2085   const struct GamePanelOrderInfo *gpo2 = (struct GamePanelOrderInfo *)object2;
2086   int compare_result;
2087
2088   if (gpo1->sort_priority != gpo2->sort_priority)
2089     compare_result = gpo1->sort_priority - gpo2->sort_priority;
2090   else
2091     compare_result = gpo1->nr - gpo2->nr;
2092
2093   return compare_result;
2094 }
2095
2096 int getPlayerInventorySize(int player_nr)
2097 {
2098   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
2099     return level.native_em_level->ply[player_nr]->dynamite;
2100   else if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
2101     return level.native_sp_level->game_sp->red_disk_count;
2102   else
2103     return stored_player[player_nr].inventory_size;
2104 }
2105
2106 void InitGameControlValues()
2107 {
2108   int i;
2109
2110   for (i = 0; game_panel_controls[i].nr != -1; i++)
2111   {
2112     struct GamePanelControlInfo *gpc = &game_panel_controls[i];
2113     struct GamePanelOrderInfo *gpo = &game_panel_order[i];
2114     struct TextPosInfo *pos = gpc->pos;
2115     int nr = gpc->nr;
2116     int type = gpc->type;
2117
2118     if (nr != i)
2119     {
2120       Error(ERR_INFO, "'game_panel_controls' structure corrupted at %d", i);
2121       Error(ERR_EXIT, "this should not happen -- please debug");
2122     }
2123
2124     /* force update of game controls after initialization */
2125     gpc->value = gpc->last_value = -1;
2126     gpc->frame = gpc->last_frame = -1;
2127     gpc->gfx_frame = -1;
2128
2129     /* determine panel value width for later calculation of alignment */
2130     if (type == TYPE_INTEGER || type == TYPE_STRING)
2131     {
2132       pos->width = pos->size * getFontWidth(pos->font);
2133       pos->height = getFontHeight(pos->font);
2134     }
2135     else if (type == TYPE_ELEMENT)
2136     {
2137       pos->width = pos->size;
2138       pos->height = pos->size;
2139     }
2140
2141     /* fill structure for game panel draw order */
2142     gpo->nr = gpc->nr;
2143     gpo->sort_priority = pos->sort_priority;
2144   }
2145
2146   /* sort game panel controls according to sort_priority and control number */
2147   qsort(game_panel_order, NUM_GAME_PANEL_CONTROLS,
2148         sizeof(struct GamePanelOrderInfo), compareGamePanelOrderInfo);
2149 }
2150
2151 void UpdatePlayfieldElementCount()
2152 {
2153   boolean use_element_count = FALSE;
2154   int i, j, x, y;
2155
2156   /* first check if it is needed at all to calculate playfield element count */
2157   for (i = GAME_PANEL_ELEMENT_COUNT_1; i <= GAME_PANEL_ELEMENT_COUNT_8; i++)
2158     if (!PANEL_DEACTIVATED(game_panel_controls[i].pos))
2159       use_element_count = TRUE;
2160
2161   if (!use_element_count)
2162     return;
2163
2164   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
2165     element_info[i].element_count = 0;
2166
2167   SCAN_PLAYFIELD(x, y)
2168   {
2169     element_info[Feld[x][y]].element_count++;
2170   }
2171
2172   for (i = 0; i < NUM_GROUP_ELEMENTS; i++)
2173     for (j = 0; j < MAX_NUM_ELEMENTS; j++)
2174       if (IS_IN_GROUP(j, i))
2175         element_info[EL_GROUP_START + i].element_count +=
2176           element_info[j].element_count;
2177 }
2178
2179 void UpdateGameControlValues()
2180 {
2181   int i, k;
2182   int time = (local_player->LevelSolved ?
2183               local_player->LevelSolved_CountingTime :
2184               level.game_engine_type == GAME_ENGINE_TYPE_EM ?
2185               level.native_em_level->lev->time :
2186               level.game_engine_type == GAME_ENGINE_TYPE_SP ?
2187               level.native_sp_level->game_sp->time_played :
2188               level.game_engine_type == GAME_ENGINE_TYPE_MM ?
2189               game_mm.energy_left :
2190               game.no_time_limit ? TimePlayed : TimeLeft);
2191   int score = (local_player->LevelSolved ?
2192                local_player->LevelSolved_CountingScore :
2193                level.game_engine_type == GAME_ENGINE_TYPE_EM ?
2194                level.native_em_level->lev->score :
2195                level.game_engine_type == GAME_ENGINE_TYPE_SP ?
2196                level.native_sp_level->game_sp->score :
2197                level.game_engine_type == GAME_ENGINE_TYPE_MM ?
2198                game_mm.score :
2199                local_player->score);
2200   int gems = (level.game_engine_type == GAME_ENGINE_TYPE_EM ?
2201               level.native_em_level->lev->required :
2202               level.game_engine_type == GAME_ENGINE_TYPE_SP ?
2203               level.native_sp_level->game_sp->infotrons_still_needed :
2204               level.game_engine_type == GAME_ENGINE_TYPE_MM ?
2205               game_mm.kettles_still_needed :
2206               local_player->gems_still_needed);
2207   int exit_closed = (level.game_engine_type == GAME_ENGINE_TYPE_EM ?
2208                      level.native_em_level->lev->required > 0 :
2209                      level.game_engine_type == GAME_ENGINE_TYPE_SP ?
2210                      level.native_sp_level->game_sp->infotrons_still_needed > 0 :
2211                      level.game_engine_type == GAME_ENGINE_TYPE_MM ?
2212                      game_mm.kettles_still_needed > 0 ||
2213                      game_mm.lights_still_needed > 0 :
2214                      local_player->gems_still_needed > 0 ||
2215                      local_player->sokobanfields_still_needed > 0 ||
2216                      local_player->lights_still_needed > 0);
2217   int health = (local_player->LevelSolved ?
2218                 local_player->LevelSolved_CountingHealth :
2219                 level.game_engine_type == GAME_ENGINE_TYPE_MM ?
2220                 MM_HEALTH(game_mm.laser_overload_value) :
2221                 local_player->health);
2222
2223   UpdatePlayfieldElementCount();
2224
2225   /* update game panel control values */
2226
2227   /* use "level.file_info.nr" instead of "level_nr" (for network games) */
2228   game_panel_controls[GAME_PANEL_LEVEL_NUMBER].value = level.file_info.nr;
2229   game_panel_controls[GAME_PANEL_GEMS].value = gems;
2230
2231   game_panel_controls[GAME_PANEL_INVENTORY_COUNT].value = 0;
2232   for (i = 0; i < MAX_NUM_KEYS; i++)
2233     game_panel_controls[GAME_PANEL_KEY_1 + i].value = EL_EMPTY;
2234   game_panel_controls[GAME_PANEL_KEY_WHITE].value = EL_EMPTY;
2235   game_panel_controls[GAME_PANEL_KEY_WHITE_COUNT].value = 0;
2236
2237   if (game.centered_player_nr == -1)
2238   {
2239     for (i = 0; i < MAX_PLAYERS; i++)
2240     {
2241       /* only one player in Supaplex game engine */
2242       if (level.game_engine_type == GAME_ENGINE_TYPE_SP && i > 0)
2243         break;
2244
2245       for (k = 0; k < MAX_NUM_KEYS; k++)
2246       {
2247         if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
2248         {
2249           if (level.native_em_level->ply[i]->keys & (1 << k))
2250             game_panel_controls[GAME_PANEL_KEY_1 + k].value =
2251               get_key_element_from_nr(k);
2252         }
2253         else if (stored_player[i].key[k])
2254           game_panel_controls[GAME_PANEL_KEY_1 + k].value =
2255             get_key_element_from_nr(k);
2256       }
2257
2258       game_panel_controls[GAME_PANEL_INVENTORY_COUNT].value +=
2259         getPlayerInventorySize(i);
2260
2261       if (stored_player[i].num_white_keys > 0)
2262         game_panel_controls[GAME_PANEL_KEY_WHITE].value =
2263           EL_DC_KEY_WHITE;
2264
2265       game_panel_controls[GAME_PANEL_KEY_WHITE_COUNT].value +=
2266         stored_player[i].num_white_keys;
2267     }
2268   }
2269   else
2270   {
2271     int player_nr = game.centered_player_nr;
2272
2273     for (k = 0; k < MAX_NUM_KEYS; k++)
2274     {
2275       if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
2276       {
2277         if (level.native_em_level->ply[player_nr]->keys & (1 << k))
2278           game_panel_controls[GAME_PANEL_KEY_1 + k].value =
2279             get_key_element_from_nr(k);
2280       }
2281       else if (stored_player[player_nr].key[k])
2282         game_panel_controls[GAME_PANEL_KEY_1 + k].value =
2283           get_key_element_from_nr(k);
2284     }
2285
2286     game_panel_controls[GAME_PANEL_INVENTORY_COUNT].value +=
2287       getPlayerInventorySize(player_nr);
2288
2289     if (stored_player[player_nr].num_white_keys > 0)
2290       game_panel_controls[GAME_PANEL_KEY_WHITE].value = EL_DC_KEY_WHITE;
2291
2292     game_panel_controls[GAME_PANEL_KEY_WHITE_COUNT].value +=
2293       stored_player[player_nr].num_white_keys;
2294   }
2295
2296   for (i = 0; i < NUM_PANEL_INVENTORY; i++)
2297   {
2298     game_panel_controls[GAME_PANEL_INVENTORY_FIRST_1 + i].value =
2299       get_inventory_element_from_pos(local_player, i);
2300     game_panel_controls[GAME_PANEL_INVENTORY_LAST_1 + i].value =
2301       get_inventory_element_from_pos(local_player, -i - 1);
2302   }
2303
2304   game_panel_controls[GAME_PANEL_SCORE].value = score;
2305   game_panel_controls[GAME_PANEL_HIGHSCORE].value = highscore[0].Score;
2306
2307   game_panel_controls[GAME_PANEL_TIME].value = time;
2308
2309   game_panel_controls[GAME_PANEL_TIME_HH].value = time / 3600;
2310   game_panel_controls[GAME_PANEL_TIME_MM].value = (time / 60) % 60;
2311   game_panel_controls[GAME_PANEL_TIME_SS].value = time % 60;
2312
2313   if (level.time == 0)
2314     game_panel_controls[GAME_PANEL_TIME_ANIM].value = 100;
2315   else
2316     game_panel_controls[GAME_PANEL_TIME_ANIM].value = time * 100 / level.time;
2317
2318   game_panel_controls[GAME_PANEL_HEALTH].value = health;
2319   game_panel_controls[GAME_PANEL_HEALTH_ANIM].value = health;
2320
2321   game_panel_controls[GAME_PANEL_FRAME].value = FrameCounter;
2322
2323   game_panel_controls[GAME_PANEL_SHIELD_NORMAL].value =
2324     (local_player->shield_normal_time_left > 0 ? EL_SHIELD_NORMAL_ACTIVE :
2325      EL_EMPTY);
2326   game_panel_controls[GAME_PANEL_SHIELD_NORMAL_TIME].value =
2327     local_player->shield_normal_time_left;
2328   game_panel_controls[GAME_PANEL_SHIELD_DEADLY].value =
2329     (local_player->shield_deadly_time_left > 0 ? EL_SHIELD_DEADLY_ACTIVE :
2330      EL_EMPTY);
2331   game_panel_controls[GAME_PANEL_SHIELD_DEADLY_TIME].value =
2332     local_player->shield_deadly_time_left;
2333
2334   game_panel_controls[GAME_PANEL_EXIT].value =
2335     (exit_closed ? EL_EXIT_CLOSED : EL_EXIT_OPEN);
2336
2337   game_panel_controls[GAME_PANEL_EMC_MAGIC_BALL].value =
2338     (game.ball_state ? EL_EMC_MAGIC_BALL_ACTIVE : EL_EMC_MAGIC_BALL);
2339   game_panel_controls[GAME_PANEL_EMC_MAGIC_BALL_SWITCH].value =
2340     (game.ball_state ? EL_EMC_MAGIC_BALL_SWITCH_ACTIVE :
2341      EL_EMC_MAGIC_BALL_SWITCH);
2342
2343   game_panel_controls[GAME_PANEL_LIGHT_SWITCH].value =
2344     (game.light_time_left > 0 ? EL_LIGHT_SWITCH_ACTIVE : EL_LIGHT_SWITCH);
2345   game_panel_controls[GAME_PANEL_LIGHT_SWITCH_TIME].value =
2346     game.light_time_left;
2347
2348   game_panel_controls[GAME_PANEL_TIMEGATE_SWITCH].value =
2349     (game.timegate_time_left > 0 ? EL_TIMEGATE_OPEN : EL_TIMEGATE_CLOSED);
2350   game_panel_controls[GAME_PANEL_TIMEGATE_SWITCH_TIME].value =
2351     game.timegate_time_left;
2352
2353   game_panel_controls[GAME_PANEL_SWITCHGATE_SWITCH].value =
2354     EL_SWITCHGATE_SWITCH_UP + game.switchgate_pos;
2355
2356   game_panel_controls[GAME_PANEL_EMC_LENSES].value =
2357     (game.lenses_time_left > 0 ? EL_EMC_LENSES : EL_EMPTY);
2358   game_panel_controls[GAME_PANEL_EMC_LENSES_TIME].value =
2359     game.lenses_time_left;
2360
2361   game_panel_controls[GAME_PANEL_EMC_MAGNIFIER].value =
2362     (game.magnify_time_left > 0 ? EL_EMC_MAGNIFIER : EL_EMPTY);
2363   game_panel_controls[GAME_PANEL_EMC_MAGNIFIER_TIME].value =
2364     game.magnify_time_left;
2365
2366   game_panel_controls[GAME_PANEL_BALLOON_SWITCH].value =
2367     (game.wind_direction == MV_LEFT  ? EL_BALLOON_SWITCH_LEFT  :
2368      game.wind_direction == MV_RIGHT ? EL_BALLOON_SWITCH_RIGHT :
2369      game.wind_direction == MV_UP    ? EL_BALLOON_SWITCH_UP    :
2370      game.wind_direction == MV_DOWN  ? EL_BALLOON_SWITCH_DOWN  :
2371      EL_BALLOON_SWITCH_NONE);
2372
2373   game_panel_controls[GAME_PANEL_DYNABOMB_NUMBER].value =
2374     local_player->dynabomb_count;
2375   game_panel_controls[GAME_PANEL_DYNABOMB_SIZE].value =
2376     local_player->dynabomb_size;
2377   game_panel_controls[GAME_PANEL_DYNABOMB_POWER].value =
2378     (local_player->dynabomb_xl ? EL_DYNABOMB_INCREASE_POWER : EL_EMPTY);
2379
2380   game_panel_controls[GAME_PANEL_PENGUINS].value =
2381     local_player->friends_still_needed;
2382
2383   game_panel_controls[GAME_PANEL_SOKOBAN_OBJECTS].value =
2384     local_player->sokobanfields_still_needed;
2385   game_panel_controls[GAME_PANEL_SOKOBAN_FIELDS].value =
2386     local_player->sokobanfields_still_needed;
2387
2388   game_panel_controls[GAME_PANEL_ROBOT_WHEEL].value =
2389     (game.robot_wheel_active ? EL_ROBOT_WHEEL_ACTIVE : EL_ROBOT_WHEEL);
2390
2391   for (i = 0; i < NUM_BELTS; i++)
2392   {
2393     game_panel_controls[GAME_PANEL_CONVEYOR_BELT_1 + i].value =
2394       (game.belt_dir[i] != MV_NONE ? EL_CONVEYOR_BELT_1_MIDDLE_ACTIVE :
2395        EL_CONVEYOR_BELT_1_MIDDLE) + i;
2396     game_panel_controls[GAME_PANEL_CONVEYOR_BELT_1_SWITCH + i].value =
2397       getBeltSwitchElementFromBeltNrAndBeltDir(i, game.belt_dir[i]);
2398   }
2399
2400   game_panel_controls[GAME_PANEL_MAGIC_WALL].value =
2401     (game.magic_wall_active ? EL_MAGIC_WALL_ACTIVE : EL_MAGIC_WALL);
2402   game_panel_controls[GAME_PANEL_MAGIC_WALL_TIME].value =
2403     game.magic_wall_time_left;
2404
2405   game_panel_controls[GAME_PANEL_GRAVITY_STATE].value =
2406     local_player->gravity;
2407
2408   for (i = 0; i < NUM_PANEL_GRAPHICS; i++)
2409     game_panel_controls[GAME_PANEL_GRAPHIC_1 + i].value = EL_GRAPHIC_1 + i;
2410
2411   for (i = 0; i < NUM_PANEL_ELEMENTS; i++)
2412     game_panel_controls[GAME_PANEL_ELEMENT_1 + i].value =
2413       (IS_DRAWABLE_ELEMENT(game.panel.element[i].id) ?
2414        game.panel.element[i].id : EL_UNDEFINED);
2415
2416   for (i = 0; i < NUM_PANEL_ELEMENTS; i++)
2417     game_panel_controls[GAME_PANEL_ELEMENT_COUNT_1 + i].value =
2418       (IS_VALID_ELEMENT(game.panel.element_count[i].id) ?
2419        element_info[game.panel.element_count[i].id].element_count : 0);
2420
2421   for (i = 0; i < NUM_PANEL_CE_SCORE; i++)
2422     game_panel_controls[GAME_PANEL_CE_SCORE_1 + i].value =
2423       (IS_CUSTOM_ELEMENT(game.panel.ce_score[i].id) ?
2424        element_info[game.panel.ce_score[i].id].collect_score : 0);
2425
2426   for (i = 0; i < NUM_PANEL_CE_SCORE; i++)
2427     game_panel_controls[GAME_PANEL_CE_SCORE_1_ELEMENT + i].value =
2428       (IS_CUSTOM_ELEMENT(game.panel.ce_score_element[i].id) ?
2429        element_info[game.panel.ce_score_element[i].id].collect_score :
2430        EL_UNDEFINED);
2431
2432   game_panel_controls[GAME_PANEL_PLAYER_NAME].value = 0;
2433   game_panel_controls[GAME_PANEL_LEVEL_NAME].value = 0;
2434   game_panel_controls[GAME_PANEL_LEVEL_AUTHOR].value = 0;
2435
2436   /* update game panel control frames */
2437
2438   for (i = 0; game_panel_controls[i].nr != -1; i++)
2439   {
2440     struct GamePanelControlInfo *gpc = &game_panel_controls[i];
2441
2442     if (gpc->type == TYPE_ELEMENT)
2443     {
2444       if (gpc->value != EL_UNDEFINED && gpc->value != EL_EMPTY)
2445       {
2446         int last_anim_random_frame = gfx.anim_random_frame;
2447         int element = gpc->value;
2448         int graphic = el2panelimg(element);
2449
2450         if (gpc->value != gpc->last_value)
2451         {
2452           gpc->gfx_frame = 0;
2453           gpc->gfx_random = INIT_GFX_RANDOM();
2454         }
2455         else
2456         {
2457           gpc->gfx_frame++;
2458
2459           if (ANIM_MODE(graphic) == ANIM_RANDOM &&
2460               IS_NEXT_FRAME(gpc->gfx_frame, graphic))
2461             gpc->gfx_random = INIT_GFX_RANDOM();
2462         }
2463
2464         if (ANIM_MODE(graphic) == ANIM_RANDOM)
2465           gfx.anim_random_frame = gpc->gfx_random;
2466
2467         if (ANIM_MODE(graphic) == ANIM_CE_SCORE)
2468           gpc->gfx_frame = element_info[element].collect_score;
2469
2470         gpc->frame = getGraphicAnimationFrame(el2panelimg(gpc->value),
2471                                               gpc->gfx_frame);
2472
2473         if (ANIM_MODE(graphic) == ANIM_RANDOM)
2474           gfx.anim_random_frame = last_anim_random_frame;
2475       }
2476     }
2477     else if (gpc->type == TYPE_GRAPHIC)
2478     {
2479       if (gpc->graphic != IMG_UNDEFINED)
2480       {
2481         int last_anim_random_frame = gfx.anim_random_frame;
2482         int graphic = gpc->graphic;
2483
2484         if (gpc->value != gpc->last_value)
2485         {
2486           gpc->gfx_frame = 0;
2487           gpc->gfx_random = INIT_GFX_RANDOM();
2488         }
2489         else
2490         {
2491           gpc->gfx_frame++;
2492
2493           if (ANIM_MODE(graphic) == ANIM_RANDOM &&
2494               IS_NEXT_FRAME(gpc->gfx_frame, graphic))
2495             gpc->gfx_random = INIT_GFX_RANDOM();
2496         }
2497
2498         if (ANIM_MODE(graphic) == ANIM_RANDOM)
2499           gfx.anim_random_frame = gpc->gfx_random;
2500
2501         gpc->frame = getGraphicAnimationFrame(graphic, gpc->gfx_frame);
2502
2503         if (ANIM_MODE(graphic) == ANIM_RANDOM)
2504           gfx.anim_random_frame = last_anim_random_frame;
2505       }
2506     }
2507   }
2508 }
2509
2510 void DisplayGameControlValues()
2511 {
2512   boolean redraw_panel = FALSE;
2513   int i;
2514
2515   for (i = 0; game_panel_controls[i].nr != -1; i++)
2516   {
2517     struct GamePanelControlInfo *gpc = &game_panel_controls[i];
2518
2519     if (PANEL_DEACTIVATED(gpc->pos))
2520       continue;
2521
2522     if (gpc->value == gpc->last_value &&
2523         gpc->frame == gpc->last_frame)
2524       continue;
2525
2526     redraw_panel = TRUE;
2527   }
2528
2529   if (!redraw_panel)
2530     return;
2531
2532   /* copy default game door content to main double buffer */
2533
2534   /* !!! CHECK AGAIN !!! */
2535   SetPanelBackground();
2536   // SetDoorBackgroundImage(IMG_BACKGROUND_PANEL);
2537   DrawBackground(DX, DY, DXSIZE, DYSIZE);
2538
2539   /* redraw game control buttons */
2540   RedrawGameButtons();
2541
2542   SetGameStatus(GAME_MODE_PSEUDO_PANEL);
2543
2544   for (i = 0; i < NUM_GAME_PANEL_CONTROLS; i++)
2545   {
2546     int nr = game_panel_order[i].nr;
2547     struct GamePanelControlInfo *gpc = &game_panel_controls[nr];
2548     struct TextPosInfo *pos = gpc->pos;
2549     int type = gpc->type;
2550     int value = gpc->value;
2551     int frame = gpc->frame;
2552     int size = pos->size;
2553     int font = pos->font;
2554     boolean draw_masked = pos->draw_masked;
2555     int mask_mode = (draw_masked ? BLIT_MASKED : BLIT_OPAQUE);
2556
2557     if (PANEL_DEACTIVATED(pos))
2558       continue;
2559
2560     gpc->last_value = value;
2561     gpc->last_frame = frame;
2562
2563     if (type == TYPE_INTEGER)
2564     {
2565       if (nr == GAME_PANEL_LEVEL_NUMBER ||
2566           nr == GAME_PANEL_TIME)
2567       {
2568         boolean use_dynamic_size = (size == -1 ? TRUE : FALSE);
2569
2570         if (use_dynamic_size)           /* use dynamic number of digits */
2571         {
2572           int value_change = (nr == GAME_PANEL_LEVEL_NUMBER ? 100 : 1000);
2573           int size1 = (nr == GAME_PANEL_LEVEL_NUMBER ? 2 : 3);
2574           int size2 = size1 + 1;
2575           int font1 = pos->font;
2576           int font2 = pos->font_alt;
2577
2578           size = (value < value_change ? size1 : size2);
2579           font = (value < value_change ? font1 : font2);
2580         }
2581       }
2582
2583       /* correct text size if "digits" is zero or less */
2584       if (size <= 0)
2585         size = strlen(int2str(value, size));
2586
2587       /* dynamically correct text alignment */
2588       pos->width = size * getFontWidth(font);
2589
2590       DrawTextExt(drawto, PANEL_XPOS(pos), PANEL_YPOS(pos),
2591                   int2str(value, size), font, mask_mode);
2592     }
2593     else if (type == TYPE_ELEMENT)
2594     {
2595       int element, graphic;
2596       Bitmap *src_bitmap;
2597       int src_x, src_y;
2598       int width, height;
2599       int dst_x = PANEL_XPOS(pos);
2600       int dst_y = PANEL_YPOS(pos);
2601
2602       if (value != EL_UNDEFINED && value != EL_EMPTY)
2603       {
2604         element = value;
2605         graphic = el2panelimg(value);
2606
2607         // printf("::: %d, '%s' [%d]\n", element, EL_NAME(element), size);
2608
2609         if (element >= EL_GRAPHIC_1 && element <= EL_GRAPHIC_8 && size == 0)
2610           size = TILESIZE;
2611
2612         getSizedGraphicSource(graphic, frame, size, &src_bitmap,
2613                               &src_x, &src_y);
2614
2615         width  = graphic_info[graphic].width  * size / TILESIZE;
2616         height = graphic_info[graphic].height * size / TILESIZE;
2617
2618         if (draw_masked)
2619           BlitBitmapMasked(src_bitmap, drawto, src_x, src_y, width, height,
2620                            dst_x, dst_y);
2621         else
2622           BlitBitmap(src_bitmap, drawto, src_x, src_y, width, height,
2623                      dst_x, dst_y);
2624       }
2625     }
2626     else if (type == TYPE_GRAPHIC)
2627     {
2628       int graphic        = gpc->graphic;
2629       int graphic_active = gpc->graphic_active;
2630       Bitmap *src_bitmap;
2631       int src_x, src_y;
2632       int width, height;
2633       int dst_x = PANEL_XPOS(pos);
2634       int dst_y = PANEL_YPOS(pos);
2635       boolean skip = (pos->class == get_hash_from_key("mm_engine_only") &&
2636                       level.game_engine_type != GAME_ENGINE_TYPE_MM);
2637
2638       if (graphic != IMG_UNDEFINED && !skip)
2639       {
2640         if (pos->style == STYLE_REVERSE)
2641           value = 100 - value;
2642
2643         getGraphicSource(graphic_active, frame, &src_bitmap, &src_x, &src_y);
2644
2645         if (pos->direction & MV_HORIZONTAL)
2646         {
2647           width  = graphic_info[graphic_active].width * value / 100;
2648           height = graphic_info[graphic_active].height;
2649
2650           if (pos->direction == MV_LEFT)
2651           {
2652             src_x += graphic_info[graphic_active].width - width;
2653             dst_x += graphic_info[graphic_active].width - width;
2654           }
2655         }
2656         else
2657         {
2658           width  = graphic_info[graphic_active].width;
2659           height = graphic_info[graphic_active].height * value / 100;
2660
2661           if (pos->direction == MV_UP)
2662           {
2663             src_y += graphic_info[graphic_active].height - height;
2664             dst_y += graphic_info[graphic_active].height - height;
2665           }
2666         }
2667
2668         if (draw_masked)
2669           BlitBitmapMasked(src_bitmap, drawto, src_x, src_y, width, height,
2670                            dst_x, dst_y);
2671         else
2672           BlitBitmap(src_bitmap, drawto, src_x, src_y, width, height,
2673                      dst_x, dst_y);
2674
2675         getGraphicSource(graphic, frame, &src_bitmap, &src_x, &src_y);
2676
2677         if (pos->direction & MV_HORIZONTAL)
2678         {
2679           if (pos->direction == MV_RIGHT)
2680           {
2681             src_x += width;
2682             dst_x += width;
2683           }
2684           else
2685           {
2686             dst_x = PANEL_XPOS(pos);
2687           }
2688
2689           width = graphic_info[graphic].width - width;
2690         }
2691         else
2692         {
2693           if (pos->direction == MV_DOWN)
2694           {
2695             src_y += height;
2696             dst_y += height;
2697           }
2698           else
2699           {
2700             dst_y = PANEL_YPOS(pos);
2701           }
2702
2703           height = graphic_info[graphic].height - height;
2704         }
2705
2706         if (draw_masked)
2707           BlitBitmapMasked(src_bitmap, drawto, src_x, src_y, width, height,
2708                            dst_x, dst_y);
2709         else
2710           BlitBitmap(src_bitmap, drawto, src_x, src_y, width, height,
2711                      dst_x, dst_y);
2712       }
2713     }
2714     else if (type == TYPE_STRING)
2715     {
2716       boolean active = (value != 0);
2717       char *state_normal = "off";
2718       char *state_active = "on";
2719       char *state = (active ? state_active : state_normal);
2720       char *s = (nr == GAME_PANEL_GRAVITY_STATE ? state :
2721                  nr == GAME_PANEL_PLAYER_NAME   ? setup.player_name :
2722                  nr == GAME_PANEL_LEVEL_NAME    ? level.name :
2723                  nr == GAME_PANEL_LEVEL_AUTHOR  ? level.author : NULL);
2724
2725       if (nr == GAME_PANEL_GRAVITY_STATE)
2726       {
2727         int font1 = pos->font;          /* (used for normal state) */
2728         int font2 = pos->font_alt;      /* (used for active state) */
2729
2730         font = (active ? font2 : font1);
2731       }
2732
2733       if (s != NULL)
2734       {
2735         char *s_cut;
2736
2737         if (size <= 0)
2738         {
2739           /* don't truncate output if "chars" is zero or less */
2740           size = strlen(s);
2741
2742           /* dynamically correct text alignment */
2743           pos->width = size * getFontWidth(font);
2744         }
2745
2746         s_cut = getStringCopyN(s, size);
2747
2748         DrawTextExt(drawto, PANEL_XPOS(pos), PANEL_YPOS(pos),
2749                     s_cut, font, mask_mode);
2750
2751         free(s_cut);
2752       }
2753     }
2754
2755     redraw_mask |= REDRAW_DOOR_1;
2756   }
2757
2758   SetGameStatus(GAME_MODE_PLAYING);
2759 }
2760
2761 void UpdateAndDisplayGameControlValues()
2762 {
2763   if (tape.deactivate_display)
2764     return;
2765
2766   UpdateGameControlValues();
2767   DisplayGameControlValues();
2768 }
2769
2770 void UpdateGameDoorValues()
2771 {
2772   UpdateGameControlValues();
2773 }
2774
2775 void DrawGameDoorValues()
2776 {
2777   DisplayGameControlValues();
2778 }
2779
2780
2781 /*
2782   =============================================================================
2783   InitGameEngine()
2784   -----------------------------------------------------------------------------
2785   initialize game engine due to level / tape version number
2786   =============================================================================
2787 */
2788
2789 static void InitGameEngine()
2790 {
2791   int i, j, k, l, x, y;
2792
2793   /* set game engine from tape file when re-playing, else from level file */
2794   game.engine_version = (tape.playing ? tape.engine_version :
2795                          level.game_version);
2796
2797   /* set single or multi-player game mode (needed for re-playing tapes) */
2798   game.team_mode = setup.team_mode;
2799
2800   if (tape.playing)
2801   {
2802     int num_players = 0;
2803
2804     for (i = 0; i < MAX_PLAYERS; i++)
2805       if (tape.player_participates[i])
2806         num_players++;
2807
2808     /* multi-player tapes contain input data for more than one player */
2809     game.team_mode = (num_players > 1);
2810   }
2811
2812   /* ---------------------------------------------------------------------- */
2813   /* set flags for bugs and changes according to active game engine version */
2814   /* ---------------------------------------------------------------------- */
2815
2816   /*
2817     Summary of bugfix/change:
2818     Fixed handling for custom elements that change when pushed by the player.
2819
2820     Fixed/changed in version:
2821     3.1.0
2822
2823     Description:
2824     Before 3.1.0, custom elements that "change when pushing" changed directly
2825     after the player started pushing them (until then handled in "DigField()").
2826     Since 3.1.0, these custom elements are not changed until the "pushing"
2827     move of the element is finished (now handled in "ContinueMoving()").
2828
2829     Affected levels/tapes:
2830     The first condition is generally needed for all levels/tapes before version
2831     3.1.0, which might use the old behaviour before it was changed; known tapes
2832     that are affected are some tapes from the level set "Walpurgis Gardens" by
2833     Jamie Cullen.
2834     The second condition is an exception from the above case and is needed for
2835     the special case of tapes recorded with game (not engine!) version 3.1.0 or
2836     above (including some development versions of 3.1.0), but before it was
2837     known that this change would break tapes like the above and was fixed in
2838     3.1.1, so that the changed behaviour was active although the engine version
2839     while recording maybe was before 3.1.0. There is at least one tape that is
2840     affected by this exception, which is the tape for the one-level set "Bug
2841     Machine" by Juergen Bonhagen.
2842   */
2843
2844   game.use_change_when_pushing_bug =
2845     (game.engine_version < VERSION_IDENT(3,1,0,0) &&
2846      !(tape.playing &&
2847        tape.game_version >= VERSION_IDENT(3,1,0,0) &&
2848        tape.game_version <  VERSION_IDENT(3,1,1,0)));
2849
2850   /*
2851     Summary of bugfix/change:
2852     Fixed handling for blocking the field the player leaves when moving.
2853
2854     Fixed/changed in version:
2855     3.1.1
2856
2857     Description:
2858     Before 3.1.1, when "block last field when moving" was enabled, the field
2859     the player is leaving when moving was blocked for the time of the move,
2860     and was directly unblocked afterwards. This resulted in the last field
2861     being blocked for exactly one less than the number of frames of one player
2862     move. Additionally, even when blocking was disabled, the last field was
2863     blocked for exactly one frame.
2864     Since 3.1.1, due to changes in player movement handling, the last field
2865     is not blocked at all when blocking is disabled. When blocking is enabled,
2866     the last field is blocked for exactly the number of frames of one player
2867     move. Additionally, if the player is Murphy, the hero of Supaplex, the
2868     last field is blocked for exactly one more than the number of frames of
2869     one player move.
2870
2871     Affected levels/tapes:
2872     (!!! yet to be determined -- probably many !!!)
2873   */
2874
2875   game.use_block_last_field_bug =
2876     (game.engine_version < VERSION_IDENT(3,1,1,0));
2877
2878   game_em.use_single_button =
2879     (game.engine_version > VERSION_IDENT(4,0,0,2));
2880
2881   game_em.use_snap_key_bug =
2882     (game.engine_version < VERSION_IDENT(4,0,1,0));
2883
2884   /* ---------------------------------------------------------------------- */
2885
2886   /* set maximal allowed number of custom element changes per game frame */
2887   game.max_num_changes_per_frame = 1;
2888
2889   /* default scan direction: scan playfield from top/left to bottom/right */
2890   InitPlayfieldScanMode(CA_ARG_SCAN_MODE_NORMAL);
2891
2892   /* dynamically adjust element properties according to game engine version */
2893   InitElementPropertiesEngine(game.engine_version);
2894
2895 #if 0
2896   printf("level %d: level version == %06d\n", level_nr, level.game_version);
2897   printf("          tape version == %06d [%s] [file: %06d]\n",
2898          tape.engine_version, (tape.playing ? "PLAYING" : "RECORDING"),
2899          tape.file_version);
2900   printf("       => game.engine_version == %06d\n", game.engine_version);
2901 #endif
2902
2903   /* ---------- initialize player's initial move delay --------------------- */
2904
2905   /* dynamically adjust player properties according to level information */
2906   for (i = 0; i < MAX_PLAYERS; i++)
2907     game.initial_move_delay_value[i] =
2908       get_move_delay_from_stepsize(level.initial_player_stepsize[i]);
2909
2910   /* dynamically adjust player properties according to game engine version */
2911   for (i = 0; i < MAX_PLAYERS; i++)
2912     game.initial_move_delay[i] =
2913       (game.engine_version <= VERSION_IDENT(2,0,1,0) ?
2914        game.initial_move_delay_value[i] : 0);
2915
2916   /* ---------- initialize player's initial push delay --------------------- */
2917
2918   /* dynamically adjust player properties according to game engine version */
2919   game.initial_push_delay_value =
2920     (game.engine_version < VERSION_IDENT(3,0,7,1) ? 5 : -1);
2921
2922   /* ---------- initialize changing elements ------------------------------- */
2923
2924   /* initialize changing elements information */
2925   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
2926   {
2927     struct ElementInfo *ei = &element_info[i];
2928
2929     /* this pointer might have been changed in the level editor */
2930     ei->change = &ei->change_page[0];
2931
2932     if (!IS_CUSTOM_ELEMENT(i))
2933     {
2934       ei->change->target_element = EL_EMPTY_SPACE;
2935       ei->change->delay_fixed = 0;
2936       ei->change->delay_random = 0;
2937       ei->change->delay_frames = 1;
2938     }
2939
2940     for (j = 0; j < NUM_CHANGE_EVENTS; j++)
2941     {
2942       ei->has_change_event[j] = FALSE;
2943
2944       ei->event_page_nr[j] = 0;
2945       ei->event_page[j] = &ei->change_page[0];
2946     }
2947   }
2948
2949   /* add changing elements from pre-defined list */
2950   for (i = 0; change_delay_list[i].element != EL_UNDEFINED; i++)
2951   {
2952     struct ChangingElementInfo *ch_delay = &change_delay_list[i];
2953     struct ElementInfo *ei = &element_info[ch_delay->element];
2954
2955     ei->change->target_element       = ch_delay->target_element;
2956     ei->change->delay_fixed          = ch_delay->change_delay;
2957
2958     ei->change->pre_change_function  = ch_delay->pre_change_function;
2959     ei->change->change_function      = ch_delay->change_function;
2960     ei->change->post_change_function = ch_delay->post_change_function;
2961
2962     ei->change->can_change = TRUE;
2963     ei->change->can_change_or_has_action = TRUE;
2964
2965     ei->has_change_event[CE_DELAY] = TRUE;
2966
2967     SET_PROPERTY(ch_delay->element, EP_CAN_CHANGE, TRUE);
2968     SET_PROPERTY(ch_delay->element, EP_CAN_CHANGE_OR_HAS_ACTION, TRUE);
2969   }
2970
2971   /* ---------- initialize internal run-time variables --------------------- */
2972
2973   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
2974   {
2975     struct ElementInfo *ei = &element_info[EL_CUSTOM_START + i];
2976
2977     for (j = 0; j < ei->num_change_pages; j++)
2978     {
2979       ei->change_page[j].can_change_or_has_action =
2980         (ei->change_page[j].can_change |
2981          ei->change_page[j].has_action);
2982     }
2983   }
2984
2985   /* add change events from custom element configuration */
2986   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
2987   {
2988     struct ElementInfo *ei = &element_info[EL_CUSTOM_START + i];
2989
2990     for (j = 0; j < ei->num_change_pages; j++)
2991     {
2992       if (!ei->change_page[j].can_change_or_has_action)
2993         continue;
2994
2995       for (k = 0; k < NUM_CHANGE_EVENTS; k++)
2996       {
2997         /* only add event page for the first page found with this event */
2998         if (ei->change_page[j].has_event[k] && !(ei->has_change_event[k]))
2999         {
3000           ei->has_change_event[k] = TRUE;
3001
3002           ei->event_page_nr[k] = j;
3003           ei->event_page[k] = &ei->change_page[j];
3004         }
3005       }
3006     }
3007   }
3008
3009   /* ---------- initialize reference elements in change conditions --------- */
3010
3011   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
3012   {
3013     int element = EL_CUSTOM_START + i;
3014     struct ElementInfo *ei = &element_info[element];
3015
3016     for (j = 0; j < ei->num_change_pages; j++)
3017     {
3018       int trigger_element = ei->change_page[j].initial_trigger_element;
3019
3020       if (trigger_element >= EL_PREV_CE_8 &&
3021           trigger_element <= EL_NEXT_CE_8)
3022         trigger_element = RESOLVED_REFERENCE_ELEMENT(element, trigger_element);
3023
3024       ei->change_page[j].trigger_element = trigger_element;
3025     }
3026   }
3027
3028   /* ---------- initialize run-time trigger player and element ------------- */
3029
3030   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
3031   {
3032     struct ElementInfo *ei = &element_info[EL_CUSTOM_START + i];
3033
3034     for (j = 0; j < ei->num_change_pages; j++)
3035     {
3036       ei->change_page[j].actual_trigger_element = EL_EMPTY;
3037       ei->change_page[j].actual_trigger_player = EL_EMPTY;
3038       ei->change_page[j].actual_trigger_player_bits = CH_PLAYER_NONE;
3039       ei->change_page[j].actual_trigger_side = CH_SIDE_NONE;
3040       ei->change_page[j].actual_trigger_ce_value = 0;
3041       ei->change_page[j].actual_trigger_ce_score = 0;
3042     }
3043   }
3044
3045   /* ---------- initialize trigger events ---------------------------------- */
3046
3047   /* initialize trigger events information */
3048   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3049     for (j = 0; j < NUM_CHANGE_EVENTS; j++)
3050       trigger_events[i][j] = FALSE;
3051
3052   /* add trigger events from element change event properties */
3053   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3054   {
3055     struct ElementInfo *ei = &element_info[i];
3056
3057     for (j = 0; j < ei->num_change_pages; j++)
3058     {
3059       if (!ei->change_page[j].can_change_or_has_action)
3060         continue;
3061
3062       if (ei->change_page[j].has_event[CE_BY_OTHER_ACTION])
3063       {
3064         int trigger_element = ei->change_page[j].trigger_element;
3065
3066         for (k = 0; k < NUM_CHANGE_EVENTS; k++)
3067         {
3068           if (ei->change_page[j].has_event[k])
3069           {
3070             if (IS_GROUP_ELEMENT(trigger_element))
3071             {
3072               struct ElementGroupInfo *group =
3073                 element_info[trigger_element].group;
3074
3075               for (l = 0; l < group->num_elements_resolved; l++)
3076                 trigger_events[group->element_resolved[l]][k] = TRUE;
3077             }
3078             else if (trigger_element == EL_ANY_ELEMENT)
3079               for (l = 0; l < MAX_NUM_ELEMENTS; l++)
3080                 trigger_events[l][k] = TRUE;
3081             else
3082               trigger_events[trigger_element][k] = TRUE;
3083           }
3084         }
3085       }
3086     }
3087   }
3088
3089   /* ---------- initialize push delay -------------------------------------- */
3090
3091   /* initialize push delay values to default */
3092   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3093   {
3094     if (!IS_CUSTOM_ELEMENT(i))
3095     {
3096       /* set default push delay values (corrected since version 3.0.7-1) */
3097       if (game.engine_version < VERSION_IDENT(3,0,7,1))
3098       {
3099         element_info[i].push_delay_fixed = 2;
3100         element_info[i].push_delay_random = 8;
3101       }
3102       else
3103       {
3104         element_info[i].push_delay_fixed = 8;
3105         element_info[i].push_delay_random = 8;
3106       }
3107     }
3108   }
3109
3110   /* set push delay value for certain elements from pre-defined list */
3111   for (i = 0; push_delay_list[i].element != EL_UNDEFINED; i++)
3112   {
3113     int e = push_delay_list[i].element;
3114
3115     element_info[e].push_delay_fixed  = push_delay_list[i].push_delay_fixed;
3116     element_info[e].push_delay_random = push_delay_list[i].push_delay_random;
3117   }
3118
3119   /* set push delay value for Supaplex elements for newer engine versions */
3120   if (game.engine_version >= VERSION_IDENT(3,1,0,0))
3121   {
3122     for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3123     {
3124       if (IS_SP_ELEMENT(i))
3125       {
3126         /* set SP push delay to just enough to push under a falling zonk */
3127         int delay = (game.engine_version >= VERSION_IDENT(3,1,1,0) ? 8 : 6);
3128
3129         element_info[i].push_delay_fixed  = delay;
3130         element_info[i].push_delay_random = 0;
3131       }
3132     }
3133   }
3134
3135   /* ---------- initialize move stepsize ----------------------------------- */
3136
3137   /* initialize move stepsize values to default */
3138   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3139     if (!IS_CUSTOM_ELEMENT(i))
3140       element_info[i].move_stepsize = MOVE_STEPSIZE_NORMAL;
3141
3142   /* set move stepsize value for certain elements from pre-defined list */
3143   for (i = 0; move_stepsize_list[i].element != EL_UNDEFINED; i++)
3144   {
3145     int e = move_stepsize_list[i].element;
3146
3147     element_info[e].move_stepsize = move_stepsize_list[i].move_stepsize;
3148   }
3149
3150   /* ---------- initialize collect score ----------------------------------- */
3151
3152   /* initialize collect score values for custom elements from initial value */
3153   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3154     if (IS_CUSTOM_ELEMENT(i))
3155       element_info[i].collect_score = element_info[i].collect_score_initial;
3156
3157   /* ---------- initialize collect count ----------------------------------- */
3158
3159   /* initialize collect count values for non-custom elements */
3160   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3161     if (!IS_CUSTOM_ELEMENT(i))
3162       element_info[i].collect_count_initial = 0;
3163
3164   /* add collect count values for all elements from pre-defined list */
3165   for (i = 0; collect_count_list[i].element != EL_UNDEFINED; i++)
3166     element_info[collect_count_list[i].element].collect_count_initial =
3167       collect_count_list[i].count;
3168
3169   /* ---------- initialize access direction -------------------------------- */
3170
3171   /* initialize access direction values to default (access from every side) */
3172   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3173     if (!IS_CUSTOM_ELEMENT(i))
3174       element_info[i].access_direction = MV_ALL_DIRECTIONS;
3175
3176   /* set access direction value for certain elements from pre-defined list */
3177   for (i = 0; access_direction_list[i].element != EL_UNDEFINED; i++)
3178     element_info[access_direction_list[i].element].access_direction =
3179       access_direction_list[i].direction;
3180
3181   /* ---------- initialize explosion content ------------------------------- */
3182   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3183   {
3184     if (IS_CUSTOM_ELEMENT(i))
3185       continue;
3186
3187     for (y = 0; y < 3; y++) for (x = 0; x < 3; x++)
3188     {
3189       /* (content for EL_YAMYAM set at run-time with game.yamyam_content_nr) */
3190
3191       element_info[i].content.e[x][y] =
3192         (i == EL_PLAYER_1 ? EL_EMERALD_YELLOW :
3193          i == EL_PLAYER_2 ? EL_EMERALD_RED :
3194          i == EL_PLAYER_3 ? EL_EMERALD :
3195          i == EL_PLAYER_4 ? EL_EMERALD_PURPLE :
3196          i == EL_MOLE ? EL_EMERALD_RED :
3197          i == EL_PENGUIN ? EL_EMERALD_PURPLE :
3198          i == EL_BUG ? (x == 1 && y == 1 ? EL_DIAMOND : EL_EMERALD) :
3199          i == EL_BD_BUTTERFLY ? EL_BD_DIAMOND :
3200          i == EL_SP_ELECTRON ? EL_SP_INFOTRON :
3201          i == EL_AMOEBA_TO_DIAMOND ? level.amoeba_content :
3202          i == EL_WALL_EMERALD ? EL_EMERALD :
3203          i == EL_WALL_DIAMOND ? EL_DIAMOND :
3204          i == EL_WALL_BD_DIAMOND ? EL_BD_DIAMOND :
3205          i == EL_WALL_EMERALD_YELLOW ? EL_EMERALD_YELLOW :
3206          i == EL_WALL_EMERALD_RED ? EL_EMERALD_RED :
3207          i == EL_WALL_EMERALD_PURPLE ? EL_EMERALD_PURPLE :
3208          i == EL_WALL_PEARL ? EL_PEARL :
3209          i == EL_WALL_CRYSTAL ? EL_CRYSTAL :
3210          EL_EMPTY);
3211     }
3212   }
3213
3214   /* ---------- initialize recursion detection ------------------------------ */
3215   recursion_loop_depth = 0;
3216   recursion_loop_detected = FALSE;
3217   recursion_loop_element = EL_UNDEFINED;
3218
3219   /* ---------- initialize graphics engine ---------------------------------- */
3220   game.scroll_delay_value =
3221     (game.forced_scroll_delay_value != -1 ? game.forced_scroll_delay_value :
3222      setup.scroll_delay                   ? setup.scroll_delay_value       : 0);
3223   game.scroll_delay_value =
3224     MIN(MAX(MIN_SCROLL_DELAY, game.scroll_delay_value), MAX_SCROLL_DELAY);
3225
3226   /* ---------- initialize game engine snapshots ---------------------------- */
3227   for (i = 0; i < MAX_PLAYERS; i++)
3228     game.snapshot.last_action[i] = 0;
3229   game.snapshot.changed_action = FALSE;
3230   game.snapshot.collected_item = FALSE;
3231   game.snapshot.mode =
3232     (strEqual(setup.engine_snapshot_mode, STR_SNAPSHOT_MODE_EVERY_STEP) ?
3233      SNAPSHOT_MODE_EVERY_STEP :
3234      strEqual(setup.engine_snapshot_mode, STR_SNAPSHOT_MODE_EVERY_MOVE) ?
3235      SNAPSHOT_MODE_EVERY_MOVE :
3236      strEqual(setup.engine_snapshot_mode, STR_SNAPSHOT_MODE_EVERY_COLLECT) ?
3237      SNAPSHOT_MODE_EVERY_COLLECT : SNAPSHOT_MODE_OFF);
3238   game.snapshot.save_snapshot = FALSE;
3239
3240   /* ---------- initialize level time for Supaplex engine ------------------- */
3241   /* Supaplex levels with time limit currently unsupported -- should be added */
3242   if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
3243     level.time = 0;
3244 }
3245
3246 int get_num_special_action(int element, int action_first, int action_last)
3247 {
3248   int num_special_action = 0;
3249   int i, j;
3250
3251   for (i = action_first; i <= action_last; i++)
3252   {
3253     boolean found = FALSE;
3254
3255     for (j = 0; j < NUM_DIRECTIONS; j++)
3256       if (el_act_dir2img(element, i, j) !=
3257           el_act_dir2img(element, ACTION_DEFAULT, j))
3258         found = TRUE;
3259
3260     if (found)
3261       num_special_action++;
3262     else
3263       break;
3264   }
3265
3266   return num_special_action;
3267 }
3268
3269
3270 /*
3271   =============================================================================
3272   InitGame()
3273   -----------------------------------------------------------------------------
3274   initialize and start new game
3275   =============================================================================
3276 */
3277
3278 #if DEBUG_INIT_PLAYER
3279 static void DebugPrintPlayerStatus(char *message)
3280 {
3281   int i;
3282
3283   if (!options.debug)
3284     return;
3285
3286   printf("%s:\n", message);
3287
3288   for (i = 0; i < MAX_PLAYERS; i++)
3289   {
3290     struct PlayerInfo *player = &stored_player[i];
3291
3292     printf("- player %d: present == %d, connected == %d [%d/%d], active == %d",
3293            i + 1,
3294            player->present,
3295            player->connected,
3296            player->connected_locally,
3297            player->connected_network,
3298            player->active);
3299
3300     if (local_player == player)
3301       printf(" (local player)");
3302
3303     printf("\n");
3304   }
3305 }
3306 #endif
3307
3308 void InitGame()
3309 {
3310   int full_lev_fieldx = lev_fieldx + (BorderElement != EL_EMPTY ? 2 : 0);
3311   int full_lev_fieldy = lev_fieldy + (BorderElement != EL_EMPTY ? 2 : 0);
3312   int fade_mask = REDRAW_FIELD;
3313
3314   boolean emulate_bd = TRUE;    /* unless non-BOULDERDASH elements found */
3315   boolean emulate_sb = TRUE;    /* unless non-SOKOBAN     elements found */
3316   boolean emulate_sp = TRUE;    /* unless non-SUPAPLEX    elements found */
3317   int initial_move_dir = MV_DOWN;
3318   int i, j, x, y;
3319
3320   // required here to update video display before fading (FIX THIS)
3321   DrawMaskedBorder(REDRAW_DOOR_2);
3322
3323   if (!game.restart_level)
3324     CloseDoor(DOOR_CLOSE_1);
3325
3326   SetGameStatus(GAME_MODE_PLAYING);
3327
3328   if (level_editor_test_game)
3329     FadeSkipNextFadeIn();
3330   else
3331     FadeSetEnterScreen();
3332
3333   if (CheckIfGlobalBorderOrPlayfieldViewportHasChanged())
3334     fade_mask = REDRAW_ALL;
3335
3336   FadeLevelSoundsAndMusic();
3337
3338   ExpireSoundLoops(TRUE);
3339
3340   if (!level_editor_test_game)
3341     FadeOut(fade_mask);
3342
3343   /* needed if different viewport properties defined for playing */
3344   ChangeViewportPropertiesIfNeeded();
3345
3346   ClearField();
3347
3348   DrawCompleteVideoDisplay();
3349
3350   OpenDoor(GetDoorState() | DOOR_NO_DELAY | DOOR_FORCE_REDRAW);
3351
3352   InitGameEngine();
3353   InitGameControlValues();
3354
3355   /* don't play tapes over network */
3356   network_playing = (network.enabled && !tape.playing);
3357
3358   for (i = 0; i < MAX_PLAYERS; i++)
3359   {
3360     struct PlayerInfo *player = &stored_player[i];
3361
3362     player->index_nr = i;
3363     player->index_bit = (1 << i);
3364     player->element_nr = EL_PLAYER_1 + i;
3365
3366     player->present = FALSE;
3367     player->active = FALSE;
3368     player->mapped = FALSE;
3369
3370     player->killed = FALSE;
3371     player->reanimated = FALSE;
3372
3373     player->action = 0;
3374     player->effective_action = 0;
3375     player->programmed_action = 0;
3376
3377     player->mouse_action.lx = 0;
3378     player->mouse_action.ly = 0;
3379     player->mouse_action.button = 0;
3380     player->mouse_action.button_hint = 0;
3381
3382     player->effective_mouse_action.lx = 0;
3383     player->effective_mouse_action.ly = 0;
3384     player->effective_mouse_action.button = 0;
3385     player->effective_mouse_action.button_hint = 0;
3386
3387     player->score = 0;
3388     player->score_final = 0;
3389
3390     player->health = MAX_HEALTH;
3391     player->health_final = MAX_HEALTH;
3392
3393     player->gems_still_needed = level.gems_needed;
3394     player->sokobanfields_still_needed = 0;
3395     player->lights_still_needed = 0;
3396     player->players_still_needed = 0;
3397     player->friends_still_needed = 0;
3398
3399     for (j = 0; j < MAX_NUM_KEYS; j++)
3400       player->key[j] = FALSE;
3401
3402     player->num_white_keys = 0;
3403
3404     player->dynabomb_count = 0;
3405     player->dynabomb_size = 1;
3406     player->dynabombs_left = 0;
3407     player->dynabomb_xl = FALSE;
3408
3409     player->MovDir = initial_move_dir;
3410     player->MovPos = 0;
3411     player->GfxPos = 0;
3412     player->GfxDir = initial_move_dir;
3413     player->GfxAction = ACTION_DEFAULT;
3414     player->Frame = 0;
3415     player->StepFrame = 0;
3416
3417     player->initial_element = player->element_nr;
3418     player->artwork_element =
3419       (level.use_artwork_element[i] ? level.artwork_element[i] :
3420        player->element_nr);
3421     player->use_murphy = FALSE;
3422
3423     player->block_last_field = FALSE;   /* initialized in InitPlayerField() */
3424     player->block_delay_adjustment = 0; /* initialized in InitPlayerField() */
3425
3426     player->gravity = level.initial_player_gravity[i];
3427
3428     player->can_fall_into_acid = CAN_MOVE_INTO_ACID(player->element_nr);
3429
3430     player->actual_frame_counter = 0;
3431
3432     player->step_counter = 0;
3433
3434     player->last_move_dir = initial_move_dir;
3435
3436     player->is_active = FALSE;
3437
3438     player->is_waiting = FALSE;
3439     player->is_moving = FALSE;
3440     player->is_auto_moving = FALSE;
3441     player->is_digging = FALSE;
3442     player->is_snapping = FALSE;
3443     player->is_collecting = FALSE;
3444     player->is_pushing = FALSE;
3445     player->is_switching = FALSE;
3446     player->is_dropping = FALSE;
3447     player->is_dropping_pressed = FALSE;
3448
3449     player->is_bored = FALSE;
3450     player->is_sleeping = FALSE;
3451
3452     player->was_waiting = TRUE;
3453     player->was_moving = FALSE;
3454     player->was_snapping = FALSE;
3455     player->was_dropping = FALSE;
3456
3457     player->force_dropping = FALSE;
3458
3459     player->frame_counter_bored = -1;
3460     player->frame_counter_sleeping = -1;
3461
3462     player->anim_delay_counter = 0;
3463     player->post_delay_counter = 0;
3464
3465     player->dir_waiting = initial_move_dir;
3466     player->action_waiting = ACTION_DEFAULT;
3467     player->last_action_waiting = ACTION_DEFAULT;
3468     player->special_action_bored = ACTION_DEFAULT;
3469     player->special_action_sleeping = ACTION_DEFAULT;
3470
3471     player->switch_x = -1;
3472     player->switch_y = -1;
3473
3474     player->drop_x = -1;
3475     player->drop_y = -1;
3476
3477     player->show_envelope = 0;
3478
3479     SetPlayerMoveSpeed(player, level.initial_player_stepsize[i], TRUE);
3480
3481     player->push_delay       = -1;      /* initialized when pushing starts */
3482     player->push_delay_value = game.initial_push_delay_value;
3483
3484     player->drop_delay = 0;
3485     player->drop_pressed_delay = 0;
3486
3487     player->last_jx = -1;
3488     player->last_jy = -1;
3489     player->jx = -1;
3490     player->jy = -1;
3491
3492     player->shield_normal_time_left = 0;
3493     player->shield_deadly_time_left = 0;
3494
3495     player->inventory_infinite_element = EL_UNDEFINED;
3496     player->inventory_size = 0;
3497
3498     if (level.use_initial_inventory[i])
3499     {
3500       for (j = 0; j < level.initial_inventory_size[i]; j++)
3501       {
3502         int element = level.initial_inventory_content[i][j];
3503         int collect_count = element_info[element].collect_count_initial;
3504         int k;
3505
3506         if (!IS_CUSTOM_ELEMENT(element))
3507           collect_count = 1;
3508
3509         if (collect_count == 0)
3510           player->inventory_infinite_element = element;
3511         else
3512           for (k = 0; k < collect_count; k++)
3513             if (player->inventory_size < MAX_INVENTORY_SIZE)
3514               player->inventory_element[player->inventory_size++] = element;
3515       }
3516     }
3517
3518     DigField(player, 0, 0, 0, 0, 0, 0, DF_NO_PUSH);
3519     SnapField(player, 0, 0);
3520
3521     player->LevelSolved = FALSE;
3522     player->GameOver = FALSE;
3523
3524     player->LevelSolved_GameWon = FALSE;
3525     player->LevelSolved_GameEnd = FALSE;
3526     player->LevelSolved_PanelOff = FALSE;
3527     player->LevelSolved_SaveTape = FALSE;
3528     player->LevelSolved_SaveScore = FALSE;
3529
3530     player->LevelSolved_CountingTime = 0;
3531     player->LevelSolved_CountingScore = 0;
3532     player->LevelSolved_CountingHealth = 0;
3533
3534     map_player_action[i] = i;
3535   }
3536
3537   network_player_action_received = FALSE;
3538
3539   /* initial null action */
3540   if (network_playing)
3541     SendToServer_MovePlayer(MV_NONE);
3542
3543   ZX = ZY = -1;
3544   ExitX = ExitY = -1;
3545
3546   FrameCounter = 0;
3547   TimeFrames = 0;
3548   TimePlayed = 0;
3549   TimeLeft = level.time;
3550   TapeTime = 0;
3551
3552   ScreenMovDir = MV_NONE;
3553   ScreenMovPos = 0;
3554   ScreenGfxPos = 0;
3555
3556   ScrollStepSize = 0;   /* will be correctly initialized by ScrollScreen() */
3557
3558   AllPlayersGone = FALSE;
3559
3560   game.no_time_limit = (level.time == 0);
3561
3562   game.yamyam_content_nr = 0;
3563   game.robot_wheel_active = FALSE;
3564   game.magic_wall_active = FALSE;
3565   game.magic_wall_time_left = 0;
3566   game.light_time_left = 0;
3567   game.timegate_time_left = 0;
3568   game.switchgate_pos = 0;
3569   game.wind_direction = level.wind_direction_initial;
3570
3571   game.lenses_time_left = 0;
3572   game.magnify_time_left = 0;
3573
3574   game.ball_state = level.ball_state_initial;
3575   game.ball_content_nr = 0;
3576
3577   game.envelope_active = FALSE;
3578
3579   for (i = 0; i < NUM_BELTS; i++)
3580   {
3581     game.belt_dir[i] = MV_NONE;
3582     game.belt_dir_nr[i] = 3;            /* not moving, next moving left */
3583   }
3584
3585   for (i = 0; i < MAX_NUM_AMOEBA; i++)
3586     AmoebaCnt[i] = AmoebaCnt2[i] = 0;
3587
3588 #if DEBUG_INIT_PLAYER
3589   DebugPrintPlayerStatus("Player status at level initialization");
3590 #endif
3591
3592   SCAN_PLAYFIELD(x, y)
3593   {
3594     Feld[x][y] = level.field[x][y];
3595     MovPos[x][y] = MovDir[x][y] = MovDelay[x][y] = 0;
3596     ChangeDelay[x][y] = 0;
3597     ChangePage[x][y] = -1;
3598     CustomValue[x][y] = 0;              /* initialized in InitField() */
3599     Store[x][y] = Store2[x][y] = StorePlayer[x][y] = Back[x][y] = 0;
3600     AmoebaNr[x][y] = 0;
3601     WasJustMoving[x][y] = 0;
3602     WasJustFalling[x][y] = 0;
3603     CheckCollision[x][y] = 0;
3604     CheckImpact[x][y] = 0;
3605     Stop[x][y] = FALSE;
3606     Pushed[x][y] = FALSE;
3607
3608     ChangeCount[x][y] = 0;
3609     ChangeEvent[x][y] = -1;
3610
3611     ExplodePhase[x][y] = 0;
3612     ExplodeDelay[x][y] = 0;
3613     ExplodeField[x][y] = EX_TYPE_NONE;
3614
3615     RunnerVisit[x][y] = 0;
3616     PlayerVisit[x][y] = 0;
3617
3618     GfxFrame[x][y] = 0;
3619     GfxRandom[x][y] = INIT_GFX_RANDOM();
3620     GfxElement[x][y] = EL_UNDEFINED;
3621     GfxAction[x][y] = ACTION_DEFAULT;
3622     GfxDir[x][y] = MV_NONE;
3623     GfxRedraw[x][y] = GFX_REDRAW_NONE;
3624   }
3625
3626   SCAN_PLAYFIELD(x, y)
3627   {
3628     if (emulate_bd && !IS_BD_ELEMENT(Feld[x][y]))
3629       emulate_bd = FALSE;
3630     if (emulate_sb && !IS_SB_ELEMENT(Feld[x][y]))
3631       emulate_sb = FALSE;
3632     if (emulate_sp && !IS_SP_ELEMENT(Feld[x][y]))
3633       emulate_sp = FALSE;
3634
3635     InitField(x, y, TRUE);
3636
3637     ResetGfxAnimation(x, y);
3638   }
3639
3640   InitBeltMovement();
3641
3642   for (i = 0; i < MAX_PLAYERS; i++)
3643   {
3644     struct PlayerInfo *player = &stored_player[i];
3645
3646     /* set number of special actions for bored and sleeping animation */
3647     player->num_special_action_bored =
3648       get_num_special_action(player->artwork_element,
3649                              ACTION_BORING_1, ACTION_BORING_LAST);
3650     player->num_special_action_sleeping =
3651       get_num_special_action(player->artwork_element,
3652                              ACTION_SLEEPING_1, ACTION_SLEEPING_LAST);
3653   }
3654
3655   game.emulation = (emulate_bd ? EMU_BOULDERDASH :
3656                     emulate_sb ? EMU_SOKOBAN :
3657                     emulate_sp ? EMU_SUPAPLEX : EMU_NONE);
3658
3659   /* initialize type of slippery elements */
3660   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3661   {
3662     if (!IS_CUSTOM_ELEMENT(i))
3663     {
3664       /* default: elements slip down either to the left or right randomly */
3665       element_info[i].slippery_type = SLIPPERY_ANY_RANDOM;
3666
3667       /* SP style elements prefer to slip down on the left side */
3668       if (game.engine_version >= VERSION_IDENT(3,1,1,0) && IS_SP_ELEMENT(i))
3669         element_info[i].slippery_type = SLIPPERY_ANY_LEFT_RIGHT;
3670
3671       /* BD style elements prefer to slip down on the left side */
3672       if (game.emulation == EMU_BOULDERDASH)
3673         element_info[i].slippery_type = SLIPPERY_ANY_LEFT_RIGHT;
3674     }
3675   }
3676
3677   /* initialize explosion and ignition delay */
3678   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3679   {
3680     if (!IS_CUSTOM_ELEMENT(i))
3681     {
3682       int num_phase = 8;
3683       int delay = (((IS_SP_ELEMENT(i) && i != EL_EMPTY_SPACE) &&
3684                     game.engine_version >= VERSION_IDENT(3,1,0,0)) ||
3685                    game.emulation == EMU_SUPAPLEX ? 3 : 2);
3686       int last_phase = (num_phase + 1) * delay;
3687       int half_phase = (num_phase / 2) * delay;
3688
3689       element_info[i].explosion_delay = last_phase - 1;
3690       element_info[i].ignition_delay = half_phase;
3691
3692       if (i == EL_BLACK_ORB)
3693         element_info[i].ignition_delay = 1;
3694     }
3695   }
3696
3697   /* correct non-moving belts to start moving left */
3698   for (i = 0; i < NUM_BELTS; i++)
3699     if (game.belt_dir[i] == MV_NONE)
3700       game.belt_dir_nr[i] = 3;          /* not moving, next moving left */
3701
3702 #if USE_NEW_PLAYER_ASSIGNMENTS
3703   for (i = 0; i < MAX_PLAYERS; i++)
3704   {
3705     stored_player[i].connected = FALSE;
3706
3707     /* in network game mode, the local player might not be the first player */
3708     if (stored_player[i].connected_locally)
3709       local_player = &stored_player[i];
3710   }
3711
3712   if (!network.enabled)
3713     local_player->connected = TRUE;
3714
3715   if (tape.playing)
3716   {
3717     for (i = 0; i < MAX_PLAYERS; i++)
3718       stored_player[i].connected = tape.player_participates[i];
3719   }
3720   else if (network.enabled)
3721   {
3722     /* add team mode players connected over the network (needed for correct
3723        assignment of player figures from level to locally playing players) */
3724
3725     for (i = 0; i < MAX_PLAYERS; i++)
3726       if (stored_player[i].connected_network)
3727         stored_player[i].connected = TRUE;
3728   }
3729   else if (game.team_mode)
3730   {
3731     /* try to guess locally connected team mode players (needed for correct
3732        assignment of player figures from level to locally playing players) */
3733
3734     for (i = 0; i < MAX_PLAYERS; i++)
3735       if (setup.input[i].use_joystick ||
3736           setup.input[i].key.left != KSYM_UNDEFINED)
3737         stored_player[i].connected = TRUE;
3738   }
3739
3740 #if DEBUG_INIT_PLAYER
3741   DebugPrintPlayerStatus("Player status after level initialization");
3742 #endif
3743
3744 #if DEBUG_INIT_PLAYER
3745   if (options.debug)
3746     printf("Reassigning players ...\n");
3747 #endif
3748
3749   /* check if any connected player was not found in playfield */
3750   for (i = 0; i < MAX_PLAYERS; i++)
3751   {
3752     struct PlayerInfo *player = &stored_player[i];
3753
3754     if (player->connected && !player->present)
3755     {
3756       struct PlayerInfo *field_player = NULL;
3757
3758 #if DEBUG_INIT_PLAYER
3759       if (options.debug)
3760         printf("- looking for field player for player %d ...\n", i + 1);
3761 #endif
3762
3763       /* assign first free player found that is present in the playfield */
3764
3765       /* first try: look for unmapped playfield player that is not connected */
3766       for (j = 0; j < MAX_PLAYERS; j++)
3767         if (field_player == NULL &&
3768             stored_player[j].present &&
3769             !stored_player[j].mapped &&
3770             !stored_player[j].connected)
3771           field_player = &stored_player[j];
3772
3773       /* second try: look for *any* unmapped playfield player */
3774       for (j = 0; j < MAX_PLAYERS; j++)
3775         if (field_player == NULL &&
3776             stored_player[j].present &&
3777             !stored_player[j].mapped)
3778           field_player = &stored_player[j];
3779
3780       if (field_player != NULL)
3781       {
3782         int jx = field_player->jx, jy = field_player->jy;
3783
3784 #if DEBUG_INIT_PLAYER
3785         if (options.debug)
3786           printf("- found player %d\n", field_player->index_nr + 1);
3787 #endif
3788
3789         player->present = FALSE;
3790         player->active = FALSE;
3791
3792         field_player->present = TRUE;
3793         field_player->active = TRUE;
3794
3795         /*
3796         player->initial_element = field_player->initial_element;
3797         player->artwork_element = field_player->artwork_element;
3798
3799         player->block_last_field       = field_player->block_last_field;
3800         player->block_delay_adjustment = field_player->block_delay_adjustment;
3801         */
3802
3803         StorePlayer[jx][jy] = field_player->element_nr;
3804
3805         field_player->jx = field_player->last_jx = jx;
3806         field_player->jy = field_player->last_jy = jy;
3807
3808         if (local_player == player)
3809           local_player = field_player;
3810
3811         map_player_action[field_player->index_nr] = i;
3812
3813         field_player->mapped = TRUE;
3814
3815 #if DEBUG_INIT_PLAYER
3816         if (options.debug)
3817           printf("- map_player_action[%d] == %d\n",
3818                  field_player->index_nr + 1, i + 1);
3819 #endif
3820       }
3821     }
3822
3823     if (player->connected && player->present)
3824       player->mapped = TRUE;
3825   }
3826
3827 #if DEBUG_INIT_PLAYER
3828   DebugPrintPlayerStatus("Player status after player assignment (first stage)");
3829 #endif
3830
3831 #else
3832
3833   /* check if any connected player was not found in playfield */
3834   for (i = 0; i < MAX_PLAYERS; i++)
3835   {
3836     struct PlayerInfo *player = &stored_player[i];
3837
3838     if (player->connected && !player->present)
3839     {
3840       for (j = 0; j < MAX_PLAYERS; j++)
3841       {
3842         struct PlayerInfo *field_player = &stored_player[j];
3843         int jx = field_player->jx, jy = field_player->jy;
3844
3845         /* assign first free player found that is present in the playfield */
3846         if (field_player->present && !field_player->connected)
3847         {
3848           player->present = TRUE;
3849           player->active = TRUE;
3850
3851           field_player->present = FALSE;
3852           field_player->active = FALSE;
3853
3854           player->initial_element = field_player->initial_element;
3855           player->artwork_element = field_player->artwork_element;
3856
3857           player->block_last_field       = field_player->block_last_field;
3858           player->block_delay_adjustment = field_player->block_delay_adjustment;
3859
3860           StorePlayer[jx][jy] = player->element_nr;
3861
3862           player->jx = player->last_jx = jx;
3863           player->jy = player->last_jy = jy;
3864
3865           break;
3866         }
3867       }
3868     }
3869   }
3870 #endif
3871
3872 #if 0
3873   printf("::: local_player->present == %d\n", local_player->present);
3874 #endif
3875
3876   /* set focus to local player for network games, else to all players */
3877   game.centered_player_nr = (network_playing ? local_player->index_nr : -1);
3878   game.centered_player_nr_next = game.centered_player_nr;
3879   game.set_centered_player = FALSE;
3880
3881   if (network_playing && tape.recording)
3882   {
3883     /* store client dependent player focus when recording network games */
3884     tape.centered_player_nr_next = game.centered_player_nr_next;
3885     tape.set_centered_player = TRUE;
3886   }
3887
3888   if (tape.playing)
3889   {
3890     /* when playing a tape, eliminate all players who do not participate */
3891
3892 #if USE_NEW_PLAYER_ASSIGNMENTS
3893
3894     if (!game.team_mode)
3895     {
3896       for (i = 0; i < MAX_PLAYERS; i++)
3897       {
3898         if (stored_player[i].active &&
3899             !tape.player_participates[map_player_action[i]])
3900         {
3901           struct PlayerInfo *player = &stored_player[i];
3902           int jx = player->jx, jy = player->jy;
3903
3904 #if DEBUG_INIT_PLAYER
3905           if (options.debug)
3906             printf("Removing player %d at (%d, %d)\n", i + 1, jx, jy);
3907 #endif
3908
3909           player->active = FALSE;
3910           StorePlayer[jx][jy] = 0;
3911           Feld[jx][jy] = EL_EMPTY;
3912         }
3913       }
3914     }
3915
3916 #else
3917
3918     for (i = 0; i < MAX_PLAYERS; i++)
3919     {
3920       if (stored_player[i].active &&
3921           !tape.player_participates[i])
3922       {
3923         struct PlayerInfo *player = &stored_player[i];
3924         int jx = player->jx, jy = player->jy;
3925
3926         player->active = FALSE;
3927         StorePlayer[jx][jy] = 0;
3928         Feld[jx][jy] = EL_EMPTY;
3929       }
3930     }
3931 #endif
3932   }
3933   else if (!network.enabled && !game.team_mode)         /* && !tape.playing */
3934   {
3935     /* when in single player mode, eliminate all but the local player */
3936
3937     for (i = 0; i < MAX_PLAYERS; i++)
3938     {
3939       struct PlayerInfo *player = &stored_player[i];
3940
3941       if (player->active && player != local_player)
3942       {
3943         int jx = player->jx, jy = player->jy;
3944
3945         player->active = FALSE;
3946         player->present = FALSE;
3947
3948         StorePlayer[jx][jy] = 0;
3949         Feld[jx][jy] = EL_EMPTY;
3950       }
3951     }
3952   }
3953
3954   for (i = 0; i < MAX_PLAYERS; i++)
3955     if (stored_player[i].active)
3956       local_player->players_still_needed++;
3957
3958   /* when recording the game, store which players take part in the game */
3959   if (tape.recording)
3960   {
3961 #if USE_NEW_PLAYER_ASSIGNMENTS
3962     for (i = 0; i < MAX_PLAYERS; i++)
3963       if (stored_player[i].connected)
3964         tape.player_participates[i] = TRUE;
3965 #else
3966     for (i = 0; i < MAX_PLAYERS; i++)
3967       if (stored_player[i].active)
3968         tape.player_participates[i] = TRUE;
3969 #endif
3970   }
3971
3972 #if DEBUG_INIT_PLAYER
3973   DebugPrintPlayerStatus("Player status after player assignment (final stage)");
3974 #endif
3975
3976   if (BorderElement == EL_EMPTY)
3977   {
3978     SBX_Left = 0;
3979     SBX_Right = lev_fieldx - SCR_FIELDX;
3980     SBY_Upper = 0;
3981     SBY_Lower = lev_fieldy - SCR_FIELDY;
3982   }
3983   else
3984   {
3985     SBX_Left = -1;
3986     SBX_Right = lev_fieldx - SCR_FIELDX + 1;
3987     SBY_Upper = -1;
3988     SBY_Lower = lev_fieldy - SCR_FIELDY + 1;
3989   }
3990
3991   if (full_lev_fieldx <= SCR_FIELDX)
3992     SBX_Left = SBX_Right = -1 * (SCR_FIELDX - lev_fieldx) / 2;
3993   if (full_lev_fieldy <= SCR_FIELDY)
3994     SBY_Upper = SBY_Lower = -1 * (SCR_FIELDY - lev_fieldy) / 2;
3995
3996   if (EVEN(SCR_FIELDX) && full_lev_fieldx > SCR_FIELDX)
3997     SBX_Left--;
3998   if (EVEN(SCR_FIELDY) && full_lev_fieldy > SCR_FIELDY)
3999     SBY_Upper--;
4000
4001   /* if local player not found, look for custom element that might create
4002      the player (make some assumptions about the right custom element) */
4003   if (!local_player->present)
4004   {
4005     int start_x = 0, start_y = 0;
4006     int found_rating = 0;
4007     int found_element = EL_UNDEFINED;
4008     int player_nr = local_player->index_nr;
4009
4010     SCAN_PLAYFIELD(x, y)
4011     {
4012       int element = Feld[x][y];
4013       int content;
4014       int xx, yy;
4015       boolean is_player;
4016
4017       if (level.use_start_element[player_nr] &&
4018           level.start_element[player_nr] == element &&
4019           found_rating < 4)
4020       {
4021         start_x = x;
4022         start_y = y;
4023
4024         found_rating = 4;
4025         found_element = element;
4026       }
4027
4028       if (!IS_CUSTOM_ELEMENT(element))
4029         continue;
4030
4031       if (CAN_CHANGE(element))
4032       {
4033         for (i = 0; i < element_info[element].num_change_pages; i++)
4034         {
4035           /* check for player created from custom element as single target */
4036           content = element_info[element].change_page[i].target_element;
4037           is_player = ELEM_IS_PLAYER(content);
4038
4039           if (is_player && (found_rating < 3 ||
4040                             (found_rating == 3 && element < found_element)))
4041           {
4042             start_x = x;
4043             start_y = y;
4044
4045             found_rating = 3;
4046             found_element = element;
4047           }
4048         }
4049       }
4050
4051       for (yy = 0; yy < 3; yy++) for (xx = 0; xx < 3; xx++)
4052       {
4053         /* check for player created from custom element as explosion content */
4054         content = element_info[element].content.e[xx][yy];
4055         is_player = ELEM_IS_PLAYER(content);
4056
4057         if (is_player && (found_rating < 2 ||
4058                           (found_rating == 2 && element < found_element)))
4059         {
4060           start_x = x + xx - 1;
4061           start_y = y + yy - 1;
4062
4063           found_rating = 2;
4064           found_element = element;
4065         }
4066
4067         if (!CAN_CHANGE(element))
4068           continue;
4069
4070         for (i = 0; i < element_info[element].num_change_pages; i++)
4071         {
4072           /* check for player created from custom element as extended target */
4073           content =
4074             element_info[element].change_page[i].target_content.e[xx][yy];
4075
4076           is_player = ELEM_IS_PLAYER(content);
4077
4078           if (is_player && (found_rating < 1 ||
4079                             (found_rating == 1 && element < found_element)))
4080           {
4081             start_x = x + xx - 1;
4082             start_y = y + yy - 1;
4083
4084             found_rating = 1;
4085             found_element = element;
4086           }
4087         }
4088       }
4089     }
4090
4091     scroll_x = SCROLL_POSITION_X(start_x);
4092     scroll_y = SCROLL_POSITION_Y(start_y);
4093   }
4094   else
4095   {
4096     scroll_x = SCROLL_POSITION_X(local_player->jx);
4097     scroll_y = SCROLL_POSITION_Y(local_player->jy);
4098   }
4099
4100   /* !!! FIX THIS (START) !!! */
4101   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
4102   {
4103     InitGameEngine_EM();
4104   }
4105   else if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
4106   {
4107     InitGameEngine_SP();
4108   }
4109   else if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
4110   {
4111     InitGameEngine_MM();
4112   }
4113   else
4114   {
4115     DrawLevel(REDRAW_FIELD);
4116     DrawAllPlayers();
4117
4118     /* after drawing the level, correct some elements */
4119     if (game.timegate_time_left == 0)
4120       CloseAllOpenTimegates();
4121   }
4122
4123   /* blit playfield from scroll buffer to normal back buffer for fading in */
4124   BlitScreenToBitmap(backbuffer);
4125   /* !!! FIX THIS (END) !!! */
4126
4127   DrawMaskedBorder(fade_mask);
4128
4129   FadeIn(fade_mask);
4130
4131 #if 1
4132   // full screen redraw is required at this point in the following cases:
4133   // - special editor door undrawn when game was started from level editor
4134   // - drawing area (playfield) was changed and has to be removed completely
4135   redraw_mask = REDRAW_ALL;
4136   BackToFront();
4137 #endif
4138
4139   if (!game.restart_level)
4140   {
4141     /* copy default game door content to main double buffer */
4142
4143     /* !!! CHECK AGAIN !!! */
4144     SetPanelBackground();
4145     // SetDoorBackgroundImage(IMG_BACKGROUND_PANEL);
4146     DrawBackground(DX, DY, DXSIZE, DYSIZE);
4147   }
4148
4149   SetPanelBackground();
4150   SetDrawBackgroundMask(REDRAW_DOOR_1);
4151
4152   UpdateAndDisplayGameControlValues();
4153
4154   if (!game.restart_level)
4155   {
4156     UnmapGameButtons();
4157     UnmapTapeButtons();
4158
4159     FreeGameButtons();
4160     CreateGameButtons();
4161
4162     MapGameButtons();
4163     MapTapeButtons();
4164
4165     /* copy actual game door content to door double buffer for OpenDoor() */
4166     BlitBitmap(drawto, bitmap_db_door_1, DX, DY, DXSIZE, DYSIZE, 0, 0);
4167
4168     OpenDoor(DOOR_OPEN_ALL);
4169
4170     KeyboardAutoRepeatOffUnlessAutoplay();
4171
4172 #if DEBUG_INIT_PLAYER
4173     DebugPrintPlayerStatus("Player status (final)");
4174 #endif
4175   }
4176
4177   UnmapAllGadgets();
4178
4179   MapGameButtons();
4180   MapTapeButtons();
4181
4182   if (!game.restart_level && !tape.playing)
4183   {
4184     LevelStats_incPlayed(level_nr);
4185
4186     SaveLevelSetup_SeriesInfo();
4187   }
4188
4189   game.restart_level = FALSE;
4190   game.restart_game_message = NULL;
4191
4192   if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
4193     InitGameActions_MM();
4194
4195   SaveEngineSnapshotToListInitial();
4196
4197   if (!game.restart_level)
4198   {
4199     PlaySound(SND_GAME_STARTING);
4200
4201     if (setup.sound_music)
4202       PlayLevelMusic();
4203   }
4204 }
4205
4206 void UpdateEngineValues(int actual_scroll_x, int actual_scroll_y,
4207                         int actual_player_x, int actual_player_y)
4208 {
4209   /* this is used for non-R'n'D game engines to update certain engine values */
4210
4211   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
4212   {
4213     actual_player_x = correctLevelPosX_EM(actual_player_x);
4214     actual_player_y = correctLevelPosY_EM(actual_player_y);
4215   }
4216
4217   /* needed to determine if sounds are played within the visible screen area */
4218   scroll_x = actual_scroll_x;
4219   scroll_y = actual_scroll_y;
4220
4221   /* needed to get player position for "follow finger" playing input method */
4222   local_player->jx = actual_player_x;
4223   local_player->jy = actual_player_y;
4224 }
4225
4226 void InitMovDir(int x, int y)
4227 {
4228   int i, element = Feld[x][y];
4229   static int xy[4][2] =
4230   {
4231     {  0, +1 },
4232     { +1,  0 },
4233     {  0, -1 },
4234     { -1,  0 }
4235   };
4236   static int direction[3][4] =
4237   {
4238     { MV_RIGHT, MV_UP,   MV_LEFT,  MV_DOWN },
4239     { MV_LEFT,  MV_DOWN, MV_RIGHT, MV_UP },
4240     { MV_LEFT,  MV_RIGHT, MV_UP, MV_DOWN }
4241   };
4242
4243   switch (element)
4244   {
4245     case EL_BUG_RIGHT:
4246     case EL_BUG_UP:
4247     case EL_BUG_LEFT:
4248     case EL_BUG_DOWN:
4249       Feld[x][y] = EL_BUG;
4250       MovDir[x][y] = direction[0][element - EL_BUG_RIGHT];
4251       break;
4252
4253     case EL_SPACESHIP_RIGHT:
4254     case EL_SPACESHIP_UP:
4255     case EL_SPACESHIP_LEFT:
4256     case EL_SPACESHIP_DOWN:
4257       Feld[x][y] = EL_SPACESHIP;
4258       MovDir[x][y] = direction[0][element - EL_SPACESHIP_RIGHT];
4259       break;
4260
4261     case EL_BD_BUTTERFLY_RIGHT:
4262     case EL_BD_BUTTERFLY_UP:
4263     case EL_BD_BUTTERFLY_LEFT:
4264     case EL_BD_BUTTERFLY_DOWN:
4265       Feld[x][y] = EL_BD_BUTTERFLY;
4266       MovDir[x][y] = direction[0][element - EL_BD_BUTTERFLY_RIGHT];
4267       break;
4268
4269     case EL_BD_FIREFLY_RIGHT:
4270     case EL_BD_FIREFLY_UP:
4271     case EL_BD_FIREFLY_LEFT:
4272     case EL_BD_FIREFLY_DOWN:
4273       Feld[x][y] = EL_BD_FIREFLY;
4274       MovDir[x][y] = direction[0][element - EL_BD_FIREFLY_RIGHT];
4275       break;
4276
4277     case EL_PACMAN_RIGHT:
4278     case EL_PACMAN_UP:
4279     case EL_PACMAN_LEFT:
4280     case EL_PACMAN_DOWN:
4281       Feld[x][y] = EL_PACMAN;
4282       MovDir[x][y] = direction[0][element - EL_PACMAN_RIGHT];
4283       break;
4284
4285     case EL_YAMYAM_LEFT:
4286     case EL_YAMYAM_RIGHT:
4287     case EL_YAMYAM_UP:
4288     case EL_YAMYAM_DOWN:
4289       Feld[x][y] = EL_YAMYAM;
4290       MovDir[x][y] = direction[2][element - EL_YAMYAM_LEFT];
4291       break;
4292
4293     case EL_SP_SNIKSNAK:
4294       MovDir[x][y] = MV_UP;
4295       break;
4296
4297     case EL_SP_ELECTRON:
4298       MovDir[x][y] = MV_LEFT;
4299       break;
4300
4301     case EL_MOLE_LEFT:
4302     case EL_MOLE_RIGHT:
4303     case EL_MOLE_UP:
4304     case EL_MOLE_DOWN:
4305       Feld[x][y] = EL_MOLE;
4306       MovDir[x][y] = direction[2][element - EL_MOLE_LEFT];
4307       break;
4308
4309     default:
4310       if (IS_CUSTOM_ELEMENT(element))
4311       {
4312         struct ElementInfo *ei = &element_info[element];
4313         int move_direction_initial = ei->move_direction_initial;
4314         int move_pattern = ei->move_pattern;
4315
4316         if (move_direction_initial == MV_START_PREVIOUS)
4317         {
4318           if (MovDir[x][y] != MV_NONE)
4319             return;
4320
4321           move_direction_initial = MV_START_AUTOMATIC;
4322         }
4323
4324         if (move_direction_initial == MV_START_RANDOM)
4325           MovDir[x][y] = 1 << RND(4);
4326         else if (move_direction_initial & MV_ANY_DIRECTION)
4327           MovDir[x][y] = move_direction_initial;
4328         else if (move_pattern == MV_ALL_DIRECTIONS ||
4329                  move_pattern == MV_TURNING_LEFT ||
4330                  move_pattern == MV_TURNING_RIGHT ||
4331                  move_pattern == MV_TURNING_LEFT_RIGHT ||
4332                  move_pattern == MV_TURNING_RIGHT_LEFT ||
4333                  move_pattern == MV_TURNING_RANDOM)
4334           MovDir[x][y] = 1 << RND(4);
4335         else if (move_pattern == MV_HORIZONTAL)
4336           MovDir[x][y] = (RND(2) ? MV_LEFT : MV_RIGHT);
4337         else if (move_pattern == MV_VERTICAL)
4338           MovDir[x][y] = (RND(2) ? MV_UP : MV_DOWN);
4339         else if (move_pattern & MV_ANY_DIRECTION)
4340           MovDir[x][y] = element_info[element].move_pattern;
4341         else if (move_pattern == MV_ALONG_LEFT_SIDE ||
4342                  move_pattern == MV_ALONG_RIGHT_SIDE)
4343         {
4344           /* use random direction as default start direction */
4345           if (game.engine_version >= VERSION_IDENT(3,1,0,0))
4346             MovDir[x][y] = 1 << RND(4);
4347
4348           for (i = 0; i < NUM_DIRECTIONS; i++)
4349           {
4350             int x1 = x + xy[i][0];
4351             int y1 = y + xy[i][1];
4352
4353             if (!IN_LEV_FIELD(x1, y1) || !IS_FREE(x1, y1))
4354             {
4355               if (move_pattern == MV_ALONG_RIGHT_SIDE)
4356                 MovDir[x][y] = direction[0][i];
4357               else
4358                 MovDir[x][y] = direction[1][i];
4359
4360               break;
4361             }
4362           }
4363         }
4364       }
4365       else
4366       {
4367         MovDir[x][y] = 1 << RND(4);
4368
4369         if (element != EL_BUG &&
4370             element != EL_SPACESHIP &&
4371             element != EL_BD_BUTTERFLY &&
4372             element != EL_BD_FIREFLY)
4373           break;
4374
4375         for (i = 0; i < NUM_DIRECTIONS; i++)
4376         {
4377           int x1 = x + xy[i][0];
4378           int y1 = y + xy[i][1];
4379
4380           if (!IN_LEV_FIELD(x1, y1) || !IS_FREE(x1, y1))
4381           {
4382             if (element == EL_BUG || element == EL_BD_BUTTERFLY)
4383             {
4384               MovDir[x][y] = direction[0][i];
4385               break;
4386             }
4387             else if (element == EL_SPACESHIP || element == EL_BD_FIREFLY ||
4388                      element == EL_SP_SNIKSNAK || element == EL_SP_ELECTRON)
4389             {
4390               MovDir[x][y] = direction[1][i];
4391               break;
4392             }
4393           }
4394         }
4395       }
4396       break;
4397   }
4398
4399   GfxDir[x][y] = MovDir[x][y];
4400 }
4401
4402 void InitAmoebaNr(int x, int y)
4403 {
4404   int i;
4405   int group_nr = AmoebeNachbarNr(x, y);
4406
4407   if (group_nr == 0)
4408   {
4409     for (i = 1; i < MAX_NUM_AMOEBA; i++)
4410     {
4411       if (AmoebaCnt[i] == 0)
4412       {
4413         group_nr = i;
4414         break;
4415       }
4416     }
4417   }
4418
4419   AmoebaNr[x][y] = group_nr;
4420   AmoebaCnt[group_nr]++;
4421   AmoebaCnt2[group_nr]++;
4422 }
4423
4424 static void PlayerWins(struct PlayerInfo *player)
4425 {
4426   if (level.game_engine_type == GAME_ENGINE_TYPE_RND &&
4427       local_player->players_still_needed > 0)
4428     return;
4429
4430   player->LevelSolved = TRUE;
4431   player->GameOver = TRUE;
4432
4433   player->score_final = (level.game_engine_type == GAME_ENGINE_TYPE_EM ?
4434                          level.native_em_level->lev->score :
4435                          level.game_engine_type == GAME_ENGINE_TYPE_MM ?
4436                          game_mm.score :
4437                          player->score);
4438   player->health_final = (level.game_engine_type == GAME_ENGINE_TYPE_MM ?
4439                           MM_HEALTH(game_mm.laser_overload_value) :
4440                           player->health);
4441
4442   player->LevelSolved_CountingTime = (game.no_time_limit ? TimePlayed :
4443                                       TimeLeft);
4444   player->LevelSolved_CountingScore = player->score_final;
4445   player->LevelSolved_CountingHealth = player->health_final;
4446 }
4447
4448 void GameWon()
4449 {
4450   static int time_count_steps;
4451   static int time, time_final;
4452   static int score, score_final;
4453   static int health, health_final;
4454   static int game_over_delay_1 = 0;
4455   static int game_over_delay_2 = 0;
4456   static int game_over_delay_3 = 0;
4457   int game_over_delay_value_1 = 50;
4458   int game_over_delay_value_2 = 25;
4459   int game_over_delay_value_3 = 50;
4460
4461   if (!local_player->LevelSolved_GameWon)
4462   {
4463     int i;
4464
4465     /* do not start end game actions before the player stops moving (to exit) */
4466     if (local_player->MovPos)
4467       return;
4468
4469     local_player->LevelSolved_GameWon = TRUE;
4470     local_player->LevelSolved_SaveTape = tape.recording;
4471     local_player->LevelSolved_SaveScore = !tape.playing;
4472
4473     if (!tape.playing)
4474     {
4475       LevelStats_incSolved(level_nr);
4476
4477       SaveLevelSetup_SeriesInfo();
4478     }
4479
4480     if (tape.auto_play)         /* tape might already be stopped here */
4481       tape.auto_play_level_solved = TRUE;
4482
4483     TapeStop();
4484
4485     game_over_delay_1 = 0;
4486     game_over_delay_2 = 0;
4487     game_over_delay_3 = game_over_delay_value_3;
4488
4489     time = time_final = (game.no_time_limit ? TimePlayed : TimeLeft);
4490     score = score_final = local_player->score_final;
4491     health = health_final = local_player->health_final;
4492
4493     if (level.score[SC_TIME_BONUS] > 0)
4494     {
4495       if (TimeLeft > 0)
4496       {
4497         time_final = 0;
4498         score_final += TimeLeft * level.score[SC_TIME_BONUS];
4499       }
4500       else if (game.no_time_limit && TimePlayed < 999)
4501       {
4502         time_final = 999;
4503         score_final += (999 - TimePlayed) * level.score[SC_TIME_BONUS];
4504       }
4505
4506       time_count_steps = MAX(1, ABS(time_final - time) / 100);
4507
4508       game_over_delay_1 = game_over_delay_value_1;
4509
4510       if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
4511       {
4512         health_final = 0;
4513         score_final += health * level.score[SC_TIME_BONUS];
4514
4515         game_over_delay_2 = game_over_delay_value_2;
4516       }
4517
4518       local_player->score_final = score_final;
4519       local_player->health_final = health_final;
4520     }
4521
4522     if (level_editor_test_game)
4523     {
4524       time = time_final;
4525       score = score_final;
4526
4527       local_player->LevelSolved_CountingTime = time;
4528       local_player->LevelSolved_CountingScore = score;
4529
4530       game_panel_controls[GAME_PANEL_TIME].value = time;
4531       game_panel_controls[GAME_PANEL_SCORE].value = score;
4532
4533       DisplayGameControlValues();
4534     }
4535
4536     if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
4537     {
4538       if (ExitX >= 0 && ExitY >= 0)     /* local player has left the level */
4539       {
4540         /* close exit door after last player */
4541         if ((AllPlayersGone &&
4542              (Feld[ExitX][ExitY] == EL_EXIT_OPEN ||
4543               Feld[ExitX][ExitY] == EL_SP_EXIT_OPEN ||
4544               Feld[ExitX][ExitY] == EL_STEEL_EXIT_OPEN)) ||
4545             Feld[ExitX][ExitY] == EL_EM_EXIT_OPEN ||
4546             Feld[ExitX][ExitY] == EL_EM_STEEL_EXIT_OPEN)
4547         {
4548           int element = Feld[ExitX][ExitY];
4549
4550           Feld[ExitX][ExitY] =
4551             (element == EL_EXIT_OPEN            ? EL_EXIT_CLOSING :
4552              element == EL_EM_EXIT_OPEN ? EL_EM_EXIT_CLOSING :
4553              element == EL_SP_EXIT_OPEN ? EL_SP_EXIT_CLOSING:
4554              element == EL_STEEL_EXIT_OPEN      ? EL_STEEL_EXIT_CLOSING:
4555              EL_EM_STEEL_EXIT_CLOSING);
4556
4557           PlayLevelSoundElementAction(ExitX, ExitY, element, ACTION_CLOSING);
4558         }
4559
4560         /* player disappears */
4561         DrawLevelField(ExitX, ExitY);
4562       }
4563
4564       for (i = 0; i < MAX_PLAYERS; i++)
4565       {
4566         struct PlayerInfo *player = &stored_player[i];
4567
4568         if (player->present)
4569         {
4570           RemovePlayer(player);
4571
4572           /* player disappears */
4573           DrawLevelField(player->jx, player->jy);
4574         }
4575       }
4576     }
4577
4578     PlaySound(SND_GAME_WINNING);
4579   }
4580
4581   if (game_over_delay_1 > 0)
4582   {
4583     game_over_delay_1--;
4584
4585     return;
4586   }
4587
4588   if (time != time_final)
4589   {
4590     int time_to_go = ABS(time_final - time);
4591     int time_count_dir = (time < time_final ? +1 : -1);
4592
4593     if (time_to_go < time_count_steps)
4594       time_count_steps = 1;
4595
4596     time  += time_count_steps * time_count_dir;
4597     score += time_count_steps * level.score[SC_TIME_BONUS];
4598
4599     local_player->LevelSolved_CountingTime = time;
4600     local_player->LevelSolved_CountingScore = score;
4601
4602     game_panel_controls[GAME_PANEL_TIME].value = time;
4603     game_panel_controls[GAME_PANEL_SCORE].value = score;
4604
4605     DisplayGameControlValues();
4606
4607     if (time == time_final)
4608       StopSound(SND_GAME_LEVELTIME_BONUS);
4609     else if (setup.sound_loops)
4610       PlaySoundLoop(SND_GAME_LEVELTIME_BONUS);
4611     else
4612       PlaySound(SND_GAME_LEVELTIME_BONUS);
4613
4614     return;
4615   }
4616
4617   if (game_over_delay_2 > 0)
4618   {
4619     game_over_delay_2--;
4620
4621     return;
4622   }
4623
4624   if (health != health_final)
4625   {
4626     int health_count_dir = (health < health_final ? +1 : -1);
4627
4628     health += health_count_dir;
4629     score  += level.score[SC_TIME_BONUS];
4630
4631     local_player->LevelSolved_CountingHealth = health;
4632     local_player->LevelSolved_CountingScore = score;
4633
4634     game_panel_controls[GAME_PANEL_HEALTH].value = health;
4635     game_panel_controls[GAME_PANEL_SCORE].value = score;
4636
4637     DisplayGameControlValues();
4638
4639     if (health == health_final)
4640       StopSound(SND_GAME_LEVELTIME_BONUS);
4641     else if (setup.sound_loops)
4642       PlaySoundLoop(SND_GAME_LEVELTIME_BONUS);
4643     else
4644       PlaySound(SND_GAME_LEVELTIME_BONUS);
4645
4646     return;
4647   }
4648
4649   local_player->LevelSolved_PanelOff = TRUE;
4650
4651   if (game_over_delay_3 > 0)
4652   {
4653     game_over_delay_3--;
4654
4655     return;
4656   }
4657
4658   GameEnd();
4659 }
4660
4661 void GameEnd()
4662 {
4663   int hi_pos;
4664   int last_level_nr = level_nr;
4665
4666   local_player->LevelSolved_GameEnd = TRUE;
4667
4668   if (local_player->LevelSolved_SaveTape)
4669   {
4670     /* make sure that request dialog to save tape does not open door again */
4671     if (!global.use_envelope_request)
4672       CloseDoor(DOOR_CLOSE_1);
4673
4674     SaveTapeChecked_LevelSolved(tape.level_nr);         /* ask to save tape */
4675   }
4676
4677   /* if no tape is to be saved, close both doors simultaneously */
4678   CloseDoor(DOOR_CLOSE_ALL);
4679
4680   if (level_editor_test_game)
4681   {
4682     SetGameStatus(GAME_MODE_MAIN);
4683
4684     DrawMainMenu();
4685
4686     return;
4687   }
4688
4689   if (!local_player->LevelSolved_SaveScore)
4690   {
4691     SetGameStatus(GAME_MODE_MAIN);
4692
4693     DrawMainMenu();
4694
4695     return;
4696   }
4697
4698   if (level_nr == leveldir_current->handicap_level)
4699   {
4700     leveldir_current->handicap_level++;
4701
4702     SaveLevelSetup_SeriesInfo();
4703   }
4704
4705   if (setup.increment_levels &&
4706       level_nr < leveldir_current->last_level)
4707   {
4708     level_nr++;         /* advance to next level */
4709     TapeErase();        /* start with empty tape */
4710
4711     if (setup.auto_play_next_level)
4712     {
4713       LoadLevel(level_nr);
4714
4715       SaveLevelSetup_SeriesInfo();
4716     }
4717   }
4718
4719   hi_pos = NewHiScore(last_level_nr);
4720
4721   if (hi_pos >= 0 && !setup.skip_scores_after_game)
4722   {
4723     SetGameStatus(GAME_MODE_SCORES);
4724
4725     DrawHallOfFame(last_level_nr, hi_pos);
4726   }
4727   else if (!setup.auto_play_next_level || !setup.increment_levels)
4728   {
4729     SetGameStatus(GAME_MODE_MAIN);
4730
4731     DrawMainMenu();
4732   }
4733   else
4734   {
4735     StartGameActions(network.enabled, setup.autorecord, level.random_seed);
4736   }
4737 }
4738
4739 int NewHiScore(int level_nr)
4740 {
4741   int k, l;
4742   int position = -1;
4743   boolean one_score_entry_per_name = !program.many_scores_per_name;
4744
4745   LoadScore(level_nr);
4746
4747   if (strEqual(setup.player_name, EMPTY_PLAYER_NAME) ||
4748       local_player->score_final < highscore[MAX_SCORE_ENTRIES - 1].Score)
4749     return -1;
4750
4751   for (k = 0; k < MAX_SCORE_ENTRIES; k++)
4752   {
4753     if (local_player->score_final > highscore[k].Score)
4754     {
4755       /* player has made it to the hall of fame */
4756
4757       if (k < MAX_SCORE_ENTRIES - 1)
4758       {
4759         int m = MAX_SCORE_ENTRIES - 1;
4760
4761         if (one_score_entry_per_name)
4762         {
4763           for (l = k; l < MAX_SCORE_ENTRIES; l++)
4764             if (strEqual(setup.player_name, highscore[l].Name))
4765               m = l;
4766
4767           if (m == k)   /* player's new highscore overwrites his old one */
4768             goto put_into_list;
4769         }
4770
4771         for (l = m; l > k; l--)
4772         {
4773           strcpy(highscore[l].Name, highscore[l - 1].Name);
4774           highscore[l].Score = highscore[l - 1].Score;
4775         }
4776       }
4777
4778       put_into_list:
4779
4780       strncpy(highscore[k].Name, setup.player_name, MAX_PLAYER_NAME_LEN);
4781       highscore[k].Name[MAX_PLAYER_NAME_LEN] = '\0';
4782       highscore[k].Score = local_player->score_final;
4783       position = k;
4784
4785       break;
4786     }
4787     else if (one_score_entry_per_name &&
4788              !strncmp(setup.player_name, highscore[k].Name,
4789                       MAX_PLAYER_NAME_LEN))
4790       break;    /* player already there with a higher score */
4791   }
4792
4793   if (position >= 0)
4794     SaveScore(level_nr);
4795
4796   return position;
4797 }
4798
4799 inline static int getElementMoveStepsizeExt(int x, int y, int direction)
4800 {
4801   int element = Feld[x][y];
4802   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
4803   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
4804   int horiz_move = (dx != 0);
4805   int sign = (horiz_move ? dx : dy);
4806   int step = sign * element_info[element].move_stepsize;
4807
4808   /* special values for move stepsize for spring and things on conveyor belt */
4809   if (horiz_move)
4810   {
4811     if (CAN_FALL(element) &&
4812         y < lev_fieldy - 1 && IS_BELT_ACTIVE(Feld[x][y + 1]))
4813       step = sign * MOVE_STEPSIZE_NORMAL / 2;
4814     else if (element == EL_SPRING)
4815       step = sign * MOVE_STEPSIZE_NORMAL * 2;
4816   }
4817
4818   return step;
4819 }
4820
4821 inline static int getElementMoveStepsize(int x, int y)
4822 {
4823   return getElementMoveStepsizeExt(x, y, MovDir[x][y]);
4824 }
4825
4826 void InitPlayerGfxAnimation(struct PlayerInfo *player, int action, int dir)
4827 {
4828   if (player->GfxAction != action || player->GfxDir != dir)
4829   {
4830     player->GfxAction = action;
4831     player->GfxDir = dir;
4832     player->Frame = 0;
4833     player->StepFrame = 0;
4834   }
4835 }
4836
4837 static void ResetGfxFrame(int x, int y)
4838 {
4839   // profiling showed that "autotest" spends 10~20% of its time in this function
4840   if (DrawingDeactivatedField())
4841     return;
4842
4843   int element = Feld[x][y];
4844   int graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
4845
4846   if (graphic_info[graphic].anim_global_sync)
4847     GfxFrame[x][y] = FrameCounter;
4848   else if (ANIM_MODE(graphic) == ANIM_CE_VALUE)
4849     GfxFrame[x][y] = CustomValue[x][y];
4850   else if (ANIM_MODE(graphic) == ANIM_CE_SCORE)
4851     GfxFrame[x][y] = element_info[element].collect_score;
4852   else if (ANIM_MODE(graphic) == ANIM_CE_DELAY)
4853     GfxFrame[x][y] = ChangeDelay[x][y];
4854 }
4855
4856 static void ResetGfxAnimation(int x, int y)
4857 {
4858   GfxAction[x][y] = ACTION_DEFAULT;
4859   GfxDir[x][y] = MovDir[x][y];
4860   GfxFrame[x][y] = 0;
4861
4862   ResetGfxFrame(x, y);
4863 }
4864
4865 static void ResetRandomAnimationValue(int x, int y)
4866 {
4867   GfxRandom[x][y] = INIT_GFX_RANDOM();
4868 }
4869
4870 void InitMovingField(int x, int y, int direction)
4871 {
4872   int element = Feld[x][y];
4873   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
4874   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
4875   int newx = x + dx;
4876   int newy = y + dy;
4877   boolean is_moving_before, is_moving_after;
4878
4879   /* check if element was/is moving or being moved before/after mode change */
4880   is_moving_before = (WasJustMoving[x][y] != 0);
4881   is_moving_after  = (getElementMoveStepsizeExt(x, y, direction)    != 0);
4882
4883   /* reset animation only for moving elements which change direction of moving
4884      or which just started or stopped moving
4885      (else CEs with property "can move" / "not moving" are reset each frame) */
4886   if (is_moving_before != is_moving_after ||
4887       direction != MovDir[x][y])
4888     ResetGfxAnimation(x, y);
4889
4890   MovDir[x][y] = direction;
4891   GfxDir[x][y] = direction;
4892
4893   GfxAction[x][y] = (!is_moving_after ? ACTION_WAITING :
4894                      direction == MV_DOWN && CAN_FALL(element) ?
4895                      ACTION_FALLING : ACTION_MOVING);
4896
4897   /* this is needed for CEs with property "can move" / "not moving" */
4898
4899   if (is_moving_after)
4900   {
4901     if (Feld[newx][newy] == EL_EMPTY)
4902       Feld[newx][newy] = EL_BLOCKED;
4903
4904     MovDir[newx][newy] = MovDir[x][y];
4905
4906     CustomValue[newx][newy] = CustomValue[x][y];
4907
4908     GfxFrame[newx][newy] = GfxFrame[x][y];
4909     GfxRandom[newx][newy] = GfxRandom[x][y];
4910     GfxAction[newx][newy] = GfxAction[x][y];
4911     GfxDir[newx][newy] = GfxDir[x][y];
4912   }
4913 }
4914
4915 void Moving2Blocked(int x, int y, int *goes_to_x, int *goes_to_y)
4916 {
4917   int direction = MovDir[x][y];
4918   int newx = x + (direction & MV_LEFT ? -1 : direction & MV_RIGHT ? +1 : 0);
4919   int newy = y + (direction & MV_UP   ? -1 : direction & MV_DOWN  ? +1 : 0);
4920
4921   *goes_to_x = newx;
4922   *goes_to_y = newy;
4923 }
4924
4925 void Blocked2Moving(int x, int y, int *comes_from_x, int *comes_from_y)
4926 {
4927   int oldx = x, oldy = y;
4928   int direction = MovDir[x][y];
4929
4930   if (direction == MV_LEFT)
4931     oldx++;
4932   else if (direction == MV_RIGHT)
4933     oldx--;
4934   else if (direction == MV_UP)
4935     oldy++;
4936   else if (direction == MV_DOWN)
4937     oldy--;
4938
4939   *comes_from_x = oldx;
4940   *comes_from_y = oldy;
4941 }
4942
4943 int MovingOrBlocked2Element(int x, int y)
4944 {
4945   int element = Feld[x][y];
4946
4947   if (element == EL_BLOCKED)
4948   {
4949     int oldx, oldy;
4950
4951     Blocked2Moving(x, y, &oldx, &oldy);
4952     return Feld[oldx][oldy];
4953   }
4954   else
4955     return element;
4956 }
4957
4958 static int MovingOrBlocked2ElementIfNotLeaving(int x, int y)
4959 {
4960   /* like MovingOrBlocked2Element(), but if element is moving
4961      and (x,y) is the field the moving element is just leaving,
4962      return EL_BLOCKED instead of the element value */
4963   int element = Feld[x][y];
4964
4965   if (IS_MOVING(x, y))
4966   {
4967     if (element == EL_BLOCKED)
4968     {
4969       int oldx, oldy;
4970
4971       Blocked2Moving(x, y, &oldx, &oldy);
4972       return Feld[oldx][oldy];
4973     }
4974     else
4975       return EL_BLOCKED;
4976   }
4977   else
4978     return element;
4979 }
4980
4981 static void RemoveField(int x, int y)
4982 {
4983   Feld[x][y] = EL_EMPTY;
4984
4985   MovPos[x][y] = 0;
4986   MovDir[x][y] = 0;
4987   MovDelay[x][y] = 0;
4988
4989   CustomValue[x][y] = 0;
4990
4991   AmoebaNr[x][y] = 0;
4992   ChangeDelay[x][y] = 0;
4993   ChangePage[x][y] = -1;
4994   Pushed[x][y] = FALSE;
4995
4996   GfxElement[x][y] = EL_UNDEFINED;
4997   GfxAction[x][y] = ACTION_DEFAULT;
4998   GfxDir[x][y] = MV_NONE;
4999 }
5000
5001 void RemoveMovingField(int x, int y)
5002 {
5003   int oldx = x, oldy = y, newx = x, newy = y;
5004   int element = Feld[x][y];
5005   int next_element = EL_UNDEFINED;
5006
5007   if (element != EL_BLOCKED && !IS_MOVING(x, y))
5008     return;
5009
5010   if (IS_MOVING(x, y))
5011   {
5012     Moving2Blocked(x, y, &newx, &newy);
5013
5014     if (Feld[newx][newy] != EL_BLOCKED)
5015     {
5016       /* element is moving, but target field is not free (blocked), but
5017          already occupied by something different (example: acid pool);
5018          in this case, only remove the moving field, but not the target */
5019
5020       RemoveField(oldx, oldy);
5021
5022       Store[oldx][oldy] = Store2[oldx][oldy] = 0;
5023
5024       TEST_DrawLevelField(oldx, oldy);
5025
5026       return;
5027     }
5028   }
5029   else if (element == EL_BLOCKED)
5030   {
5031     Blocked2Moving(x, y, &oldx, &oldy);
5032     if (!IS_MOVING(oldx, oldy))
5033       return;
5034   }
5035
5036   if (element == EL_BLOCKED &&
5037       (Feld[oldx][oldy] == EL_QUICKSAND_EMPTYING ||
5038        Feld[oldx][oldy] == EL_QUICKSAND_FAST_EMPTYING ||
5039        Feld[oldx][oldy] == EL_MAGIC_WALL_EMPTYING ||
5040        Feld[oldx][oldy] == EL_BD_MAGIC_WALL_EMPTYING ||
5041        Feld[oldx][oldy] == EL_DC_MAGIC_WALL_EMPTYING ||
5042        Feld[oldx][oldy] == EL_AMOEBA_DROPPING))
5043     next_element = get_next_element(Feld[oldx][oldy]);
5044
5045   RemoveField(oldx, oldy);
5046   RemoveField(newx, newy);
5047
5048   Store[oldx][oldy] = Store2[oldx][oldy] = 0;
5049
5050   if (next_element != EL_UNDEFINED)
5051     Feld[oldx][oldy] = next_element;
5052
5053   TEST_DrawLevelField(oldx, oldy);
5054   TEST_DrawLevelField(newx, newy);
5055 }
5056
5057 void DrawDynamite(int x, int y)
5058 {
5059   int sx = SCREENX(x), sy = SCREENY(y);
5060   int graphic = el2img(Feld[x][y]);
5061   int frame;
5062
5063   if (!IN_SCR_FIELD(sx, sy) || IS_PLAYER(x, y))
5064     return;
5065
5066   if (IS_WALKABLE_INSIDE(Back[x][y]))
5067     return;
5068
5069   if (Back[x][y])
5070     DrawGraphic(sx, sy, el2img(Back[x][y]), 0);
5071   else if (Store[x][y])
5072     DrawGraphic(sx, sy, el2img(Store[x][y]), 0);
5073
5074   frame = getGraphicAnimationFrame(graphic, GfxFrame[x][y]);
5075
5076   if (Back[x][y] || Store[x][y])
5077     DrawGraphicThruMask(sx, sy, graphic, frame);
5078   else
5079     DrawGraphic(sx, sy, graphic, frame);
5080 }
5081
5082 void CheckDynamite(int x, int y)
5083 {
5084   if (MovDelay[x][y] != 0)      /* dynamite is still waiting to explode */
5085   {
5086     MovDelay[x][y]--;
5087
5088     if (MovDelay[x][y] != 0)
5089     {
5090       DrawDynamite(x, y);
5091       PlayLevelSoundActionIfLoop(x, y, ACTION_ACTIVE);
5092
5093       return;
5094     }
5095   }
5096
5097   StopLevelSoundActionIfLoop(x, y, ACTION_ACTIVE);
5098
5099   Bang(x, y);
5100 }
5101
5102 static void setMinimalPlayerBoundaries(int *sx1, int *sy1, int *sx2, int *sy2)
5103 {
5104   boolean num_checked_players = 0;
5105   int i;
5106
5107   for (i = 0; i < MAX_PLAYERS; i++)
5108   {
5109     if (stored_player[i].active)
5110     {
5111       int sx = stored_player[i].jx;
5112       int sy = stored_player[i].jy;
5113
5114       if (num_checked_players == 0)
5115       {
5116         *sx1 = *sx2 = sx;
5117         *sy1 = *sy2 = sy;
5118       }
5119       else
5120       {
5121         *sx1 = MIN(*sx1, sx);
5122         *sy1 = MIN(*sy1, sy);
5123         *sx2 = MAX(*sx2, sx);
5124         *sy2 = MAX(*sy2, sy);
5125       }
5126
5127       num_checked_players++;
5128     }
5129   }
5130 }
5131
5132 static boolean checkIfAllPlayersFitToScreen_RND()
5133 {
5134   int sx1 = 0, sy1 = 0, sx2 = 0, sy2 = 0;
5135
5136   setMinimalPlayerBoundaries(&sx1, &sy1, &sx2, &sy2);
5137
5138   return (sx2 - sx1 < SCR_FIELDX &&
5139           sy2 - sy1 < SCR_FIELDY);
5140 }
5141
5142 static void setScreenCenteredToAllPlayers(int *sx, int *sy)
5143 {
5144   int sx1 = scroll_x, sy1 = scroll_y, sx2 = scroll_x, sy2 = scroll_y;
5145
5146   setMinimalPlayerBoundaries(&sx1, &sy1, &sx2, &sy2);
5147
5148   *sx = (sx1 + sx2) / 2;
5149   *sy = (sy1 + sy2) / 2;
5150 }
5151
5152 void DrawRelocateScreen(int old_x, int old_y, int x, int y, int move_dir,
5153                         boolean center_screen, boolean quick_relocation)
5154 {
5155   unsigned int frame_delay_value_old = GetVideoFrameDelay();
5156   boolean ffwd_delay = (tape.playing && tape.fast_forward);
5157   boolean no_delay = (tape.warp_forward);
5158   int frame_delay_value = (ffwd_delay ? FfwdFrameDelay : GameFrameDelay);
5159   int wait_delay_value = (no_delay ? 0 : frame_delay_value);
5160   int new_scroll_x, new_scroll_y;
5161
5162   if (level.lazy_relocation && IN_VIS_FIELD(SCREENX(x), SCREENY(y)))
5163   {
5164     /* case 1: quick relocation inside visible screen (without scrolling) */
5165
5166     RedrawPlayfield();
5167
5168     return;
5169   }
5170
5171   if (!level.shifted_relocation || center_screen)
5172   {
5173     /* relocation _with_ centering of screen */
5174
5175     new_scroll_x = SCROLL_POSITION_X(x);
5176     new_scroll_y = SCROLL_POSITION_Y(y);
5177   }
5178   else
5179   {
5180     /* relocation _without_ centering of screen */
5181
5182     int center_scroll_x = SCROLL_POSITION_X(old_x);
5183     int center_scroll_y = SCROLL_POSITION_Y(old_y);
5184     int offset_x = x + (scroll_x - center_scroll_x);
5185     int offset_y = y + (scroll_y - center_scroll_y);
5186
5187     /* for new screen position, apply previous offset to center position */
5188     new_scroll_x = SCROLL_POSITION_X(offset_x);
5189     new_scroll_y = SCROLL_POSITION_Y(offset_y);
5190   }
5191
5192   if (quick_relocation)
5193   {
5194     /* case 2: quick relocation (redraw without visible scrolling) */
5195
5196     scroll_x = new_scroll_x;
5197     scroll_y = new_scroll_y;
5198
5199     RedrawPlayfield();
5200
5201     return;
5202   }
5203
5204   /* case 3: visible relocation (with scrolling to new position) */
5205
5206   ScrollScreen(NULL, SCROLL_GO_ON);     /* scroll last frame to full tile */
5207
5208   SetVideoFrameDelay(wait_delay_value);
5209
5210   while (scroll_x != new_scroll_x || scroll_y != new_scroll_y)
5211   {
5212     int dx = 0, dy = 0;
5213     int fx = FX, fy = FY;
5214
5215     dx = (new_scroll_x < scroll_x ? +1 : new_scroll_x > scroll_x ? -1 : 0);
5216     dy = (new_scroll_y < scroll_y ? +1 : new_scroll_y > scroll_y ? -1 : 0);
5217
5218     if (dx == 0 && dy == 0)             /* no scrolling needed at all */
5219       break;
5220
5221     scroll_x -= dx;
5222     scroll_y -= dy;
5223
5224     fx += dx * TILEX / 2;
5225     fy += dy * TILEY / 2;
5226
5227     ScrollLevel(dx, dy);
5228     DrawAllPlayers();
5229
5230     /* scroll in two steps of half tile size to make things smoother */
5231     BlitBitmap(drawto_field, window, fx, fy, SXSIZE, SYSIZE, SX, SY);
5232
5233     /* scroll second step to align at full tile size */
5234     BlitScreenToBitmap(window);
5235   }
5236
5237   DrawAllPlayers();
5238   BackToFront();
5239
5240   SetVideoFrameDelay(frame_delay_value_old);
5241 }
5242
5243 void RelocatePlayer(int jx, int jy, int el_player_raw)
5244 {
5245   int el_player = GET_PLAYER_ELEMENT(el_player_raw);
5246   int player_nr = GET_PLAYER_NR(el_player);
5247   struct PlayerInfo *player = &stored_player[player_nr];
5248   boolean ffwd_delay = (tape.playing && tape.fast_forward);
5249   boolean no_delay = (tape.warp_forward);
5250   int frame_delay_value = (ffwd_delay ? FfwdFrameDelay : GameFrameDelay);
5251   int wait_delay_value = (no_delay ? 0 : frame_delay_value);
5252   int old_jx = player->jx;
5253   int old_jy = player->jy;
5254   int old_element = Feld[old_jx][old_jy];
5255   int element = Feld[jx][jy];
5256   boolean player_relocated = (old_jx != jx || old_jy != jy);
5257
5258   int move_dir_horiz = (jx < old_jx ? MV_LEFT : jx > old_jx ? MV_RIGHT : 0);
5259   int move_dir_vert  = (jy < old_jy ? MV_UP   : jy > old_jy ? MV_DOWN  : 0);
5260   int enter_side_horiz = MV_DIR_OPPOSITE(move_dir_horiz);
5261   int enter_side_vert  = MV_DIR_OPPOSITE(move_dir_vert);
5262   int leave_side_horiz = move_dir_horiz;
5263   int leave_side_vert  = move_dir_vert;
5264   int enter_side = enter_side_horiz | enter_side_vert;
5265   int leave_side = leave_side_horiz | leave_side_vert;
5266
5267   if (player->GameOver)         /* do not reanimate dead player */
5268     return;
5269
5270   if (!player_relocated)        /* no need to relocate the player */
5271     return;
5272
5273   if (IS_PLAYER(jx, jy))        /* player already placed at new position */
5274   {
5275     RemoveField(jx, jy);        /* temporarily remove newly placed player */
5276     DrawLevelField(jx, jy);
5277   }
5278
5279   if (player->present)
5280   {
5281     while (player->MovPos)
5282     {
5283       ScrollPlayer(player, SCROLL_GO_ON);
5284       ScrollScreen(NULL, SCROLL_GO_ON);
5285
5286       AdvanceFrameAndPlayerCounters(player->index_nr);
5287
5288       DrawPlayer(player);
5289
5290       BackToFront_WithFrameDelay(wait_delay_value);
5291     }
5292
5293     DrawPlayer(player);         /* needed here only to cleanup last field */
5294     DrawLevelField(player->jx, player->jy);     /* remove player graphic */
5295
5296     player->is_moving = FALSE;
5297   }
5298
5299   if (IS_CUSTOM_ELEMENT(old_element))
5300     CheckElementChangeByPlayer(old_jx, old_jy, old_element,
5301                                CE_LEFT_BY_PLAYER,
5302                                player->index_bit, leave_side);
5303
5304   CheckTriggeredElementChangeByPlayer(old_jx, old_jy, old_element,
5305                                       CE_PLAYER_LEAVES_X,
5306                                       player->index_bit, leave_side);
5307
5308   Feld[jx][jy] = el_player;
5309   InitPlayerField(jx, jy, el_player, TRUE);
5310
5311   /* "InitPlayerField()" above sets Feld[jx][jy] to EL_EMPTY, but it may be
5312      possible that the relocation target field did not contain a player element,
5313      but a walkable element, to which the new player was relocated -- in this
5314      case, restore that (already initialized!) element on the player field */
5315   if (!ELEM_IS_PLAYER(element)) /* player may be set on walkable element */
5316   {
5317     Feld[jx][jy] = element;     /* restore previously existing element */
5318   }
5319
5320   /* only visually relocate centered player */
5321   DrawRelocateScreen(old_jx, old_jy, player->jx, player->jy, player->MovDir,
5322                      FALSE, level.instant_relocation);
5323
5324   TestIfPlayerTouchesBadThing(jx, jy);
5325   TestIfPlayerTouchesCustomElement(jx, jy);
5326
5327   if (IS_CUSTOM_ELEMENT(element))
5328     CheckElementChangeByPlayer(jx, jy, element, CE_ENTERED_BY_PLAYER,
5329                                player->index_bit, enter_side);
5330
5331   CheckTriggeredElementChangeByPlayer(jx, jy, element, CE_PLAYER_ENTERS_X,
5332                                       player->index_bit, enter_side);
5333
5334   if (player->is_switching)
5335   {
5336     /* ensure that relocation while still switching an element does not cause
5337        a new element to be treated as also switched directly after relocation
5338        (this is important for teleporter switches that teleport the player to
5339        a place where another teleporter switch is in the same direction, which
5340        would then incorrectly be treated as immediately switched before the
5341        direction key that caused the switch was released) */
5342
5343     player->switch_x += jx - old_jx;
5344     player->switch_y += jy - old_jy;
5345   }
5346 }
5347
5348 void Explode(int ex, int ey, int phase, int mode)
5349 {
5350   int x, y;
5351   int last_phase;
5352   int border_element;
5353
5354   /* !!! eliminate this variable !!! */
5355   int delay = (game.emulation == EMU_SUPAPLEX ? 3 : 2);
5356
5357   if (game.explosions_delayed)
5358   {
5359     ExplodeField[ex][ey] = mode;
5360     return;
5361   }
5362
5363   if (phase == EX_PHASE_START)          /* initialize 'Store[][]' field */
5364   {
5365     int center_element = Feld[ex][ey];
5366     int artwork_element, explosion_element;     /* set these values later */
5367
5368     /* remove things displayed in background while burning dynamite */
5369     if (Back[ex][ey] != EL_EMPTY && !IS_INDESTRUCTIBLE(Back[ex][ey]))
5370       Back[ex][ey] = 0;
5371
5372     if (IS_MOVING(ex, ey) || IS_BLOCKED(ex, ey))
5373     {
5374       /* put moving element to center field (and let it explode there) */
5375       center_element = MovingOrBlocked2Element(ex, ey);
5376       RemoveMovingField(ex, ey);
5377       Feld[ex][ey] = center_element;
5378     }
5379
5380     /* now "center_element" is finally determined -- set related values now */
5381     artwork_element = center_element;           /* for custom player artwork */
5382     explosion_element = center_element;         /* for custom player artwork */
5383
5384     if (IS_PLAYER(ex, ey))
5385     {
5386       int player_nr = GET_PLAYER_NR(StorePlayer[ex][ey]);
5387
5388       artwork_element = stored_player[player_nr].artwork_element;
5389
5390       if (level.use_explosion_element[player_nr])
5391       {
5392         explosion_element = level.explosion_element[player_nr];
5393         artwork_element = explosion_element;
5394       }
5395     }
5396
5397     if (mode == EX_TYPE_NORMAL ||
5398         mode == EX_TYPE_CENTER ||
5399         mode == EX_TYPE_CROSS)
5400       PlayLevelSoundElementAction(ex, ey, artwork_element, ACTION_EXPLODING);
5401
5402     last_phase = element_info[explosion_element].explosion_delay + 1;
5403
5404     for (y = ey - 1; y <= ey + 1; y++) for (x = ex - 1; x <= ex + 1; x++)
5405     {
5406       int xx = x - ex + 1;
5407       int yy = y - ey + 1;
5408       int element;
5409
5410       if (!IN_LEV_FIELD(x, y) ||
5411           (mode & EX_TYPE_SINGLE_TILE && (x != ex || y != ey)) ||
5412           (mode == EX_TYPE_CROSS      && (x != ex && y != ey)))
5413         continue;
5414
5415       element = Feld[x][y];
5416
5417       if (IS_MOVING(x, y) || IS_BLOCKED(x, y))
5418       {
5419         element = MovingOrBlocked2Element(x, y);
5420
5421         if (!IS_EXPLOSION_PROOF(element))
5422           RemoveMovingField(x, y);
5423       }
5424
5425       /* indestructible elements can only explode in center (but not flames) */
5426       if ((IS_EXPLOSION_PROOF(element) && (x != ex || y != ey ||
5427                                            mode == EX_TYPE_BORDER)) ||
5428           element == EL_FLAMES)
5429         continue;
5430
5431       /* no idea why this was changed from 3.0.8 to 3.1.0 -- this causes buggy
5432          behaviour, for example when touching a yamyam that explodes to rocks
5433          with active deadly shield, a rock is created under the player !!! */
5434       /* (case 1 (surely buggy): >= 3.1.0, case 2 (maybe buggy): <= 3.0.8) */
5435 #if 0
5436       if (IS_PLAYER(x, y) && SHIELD_ON(PLAYERINFO(x, y)) &&
5437           (game.engine_version < VERSION_IDENT(3,1,0,0) ||
5438            (x == ex && y == ey && mode != EX_TYPE_BORDER)))
5439 #else
5440       if (IS_PLAYER(x, y) && SHIELD_ON(PLAYERINFO(x, y)))
5441 #endif
5442       {
5443         if (IS_ACTIVE_BOMB(element))
5444         {
5445           /* re-activate things under the bomb like gate or penguin */
5446           Feld[x][y] = (Back[x][y] ? Back[x][y] : EL_EMPTY);
5447           Back[x][y] = 0;
5448         }
5449
5450         continue;
5451       }
5452
5453       /* save walkable background elements while explosion on same tile */
5454       if (IS_WALKABLE(element) && IS_INDESTRUCTIBLE(element) &&
5455           (x != ex || y != ey || mode == EX_TYPE_BORDER))
5456         Back[x][y] = element;
5457
5458       /* ignite explodable elements reached by other explosion */
5459       if (element == EL_EXPLOSION)
5460         element = Store2[x][y];
5461
5462       if (AmoebaNr[x][y] &&
5463           (element == EL_AMOEBA_FULL ||
5464            element == EL_BD_AMOEBA ||
5465            element == EL_AMOEBA_GROWING))
5466       {
5467         AmoebaCnt[AmoebaNr[x][y]]--;
5468         AmoebaCnt2[AmoebaNr[x][y]]--;
5469       }
5470
5471       RemoveField(x, y);
5472
5473       if (IS_PLAYER(ex, ey) && !PLAYER_EXPLOSION_PROTECTED(ex, ey))
5474       {
5475         int player_nr = StorePlayer[ex][ey] - EL_PLAYER_1;
5476
5477         Store[x][y] = EL_PLAYER_IS_EXPLODING_1 + player_nr;
5478
5479         if (PLAYERINFO(ex, ey)->use_murphy)
5480           Store[x][y] = EL_EMPTY;
5481       }
5482
5483       /* !!! check this case -- currently needed for rnd_rado_negundo_v,
5484          !!! levels 015 018 019 020 021 022 023 026 027 028 !!! */
5485       else if (ELEM_IS_PLAYER(center_element))
5486         Store[x][y] = EL_EMPTY;
5487       else if (center_element == EL_YAMYAM)
5488         Store[x][y] = level.yamyam_content[game.yamyam_content_nr].e[xx][yy];
5489       else if (element_info[center_element].content.e[xx][yy] != EL_EMPTY)
5490         Store[x][y] = element_info[center_element].content.e[xx][yy];
5491 #if 1
5492       /* needed because EL_BD_BUTTERFLY is not defined as "CAN_EXPLODE"
5493          (killing EL_BD_BUTTERFLY with dynamite would result in BD diamond
5494          otherwise) -- FIX THIS !!! */
5495       else if (!CAN_EXPLODE(element) && element != EL_BD_BUTTERFLY)
5496         Store[x][y] = element_info[element].content.e[1][1];
5497 #else
5498       else if (!CAN_EXPLODE(element))
5499         Store[x][y] = element_info[element].content.e[1][1];
5500 #endif
5501       else
5502         Store[x][y] = EL_EMPTY;
5503
5504       if (x != ex || y != ey || mode == EX_TYPE_BORDER ||
5505           center_element == EL_AMOEBA_TO_DIAMOND)
5506         Store2[x][y] = element;
5507
5508       Feld[x][y] = EL_EXPLOSION;
5509       GfxElement[x][y] = artwork_element;
5510
5511       ExplodePhase[x][y] = 1;
5512       ExplodeDelay[x][y] = last_phase;
5513
5514       Stop[x][y] = TRUE;
5515     }
5516
5517     if (center_element == EL_YAMYAM)
5518       game.yamyam_content_nr =
5519         (game.yamyam_content_nr + 1) % level.num_yamyam_contents;
5520
5521     return;
5522   }
5523
5524   if (Stop[ex][ey])
5525     return;
5526
5527   x = ex;
5528   y = ey;
5529
5530   if (phase == 1)
5531     GfxFrame[x][y] = 0;         /* restart explosion animation */
5532
5533   last_phase = ExplodeDelay[x][y];
5534
5535   ExplodePhase[x][y] = (phase < last_phase ? phase + 1 : 0);
5536
5537   /* this can happen if the player leaves an explosion just in time */
5538   if (GfxElement[x][y] == EL_UNDEFINED)
5539     GfxElement[x][y] = EL_EMPTY;
5540
5541   border_element = Store2[x][y];
5542   if (IS_PLAYER(x, y) && !PLAYER_EXPLOSION_PROTECTED(x, y))
5543     border_element = StorePlayer[x][y];
5544
5545   if (phase == element_info[border_element].ignition_delay ||
5546       phase == last_phase)
5547   {
5548     boolean border_explosion = FALSE;
5549
5550     if (IS_PLAYER(x, y) && PLAYERINFO(x, y)->present &&
5551         !PLAYER_EXPLOSION_PROTECTED(x, y))
5552     {
5553       KillPlayerUnlessExplosionProtected(x, y);
5554       border_explosion = TRUE;
5555     }
5556     else if (CAN_EXPLODE_BY_EXPLOSION(border_element))
5557     {
5558       Feld[x][y] = Store2[x][y];
5559       Store2[x][y] = 0;
5560       Bang(x, y);
5561       border_explosion = TRUE;
5562     }
5563     else if (border_element == EL_AMOEBA_TO_DIAMOND)
5564     {
5565       AmoebeUmwandeln(x, y);
5566       Store2[x][y] = 0;
5567       border_explosion = TRUE;
5568     }
5569
5570     /* if an element just explodes due to another explosion (chain-reaction),
5571        do not immediately end the new explosion when it was the last frame of
5572        the explosion (as it would be done in the following "if"-statement!) */
5573     if (border_explosion && phase == last_phase)
5574       return;
5575   }
5576
5577   if (phase == last_phase)
5578   {
5579     int element;
5580
5581     element = Feld[x][y] = Store[x][y];
5582     Store[x][y] = Store2[x][y] = 0;
5583     GfxElement[x][y] = EL_UNDEFINED;
5584
5585     /* player can escape from explosions and might therefore be still alive */
5586     if (element >= EL_PLAYER_IS_EXPLODING_1 &&
5587         element <= EL_PLAYER_IS_EXPLODING_4)
5588     {
5589       int player_nr = element - EL_PLAYER_IS_EXPLODING_1;
5590       int explosion_element = EL_PLAYER_1 + player_nr;
5591       int xx = MIN(MAX(0, x - stored_player[player_nr].jx + 1), 2);
5592       int yy = MIN(MAX(0, y - stored_player[player_nr].jy + 1), 2);
5593
5594       if (level.use_explosion_element[player_nr])
5595         explosion_element = level.explosion_element[player_nr];
5596
5597       Feld[x][y] = (stored_player[player_nr].active ? EL_EMPTY :
5598                     element_info[explosion_element].content.e[xx][yy]);
5599     }
5600
5601     /* restore probably existing indestructible background element */
5602     if (Back[x][y] && IS_INDESTRUCTIBLE(Back[x][y]))
5603       element = Feld[x][y] = Back[x][y];
5604     Back[x][y] = 0;
5605
5606     MovDir[x][y] = MovPos[x][y] = MovDelay[x][y] = 0;
5607     GfxDir[x][y] = MV_NONE;
5608     ChangeDelay[x][y] = 0;
5609     ChangePage[x][y] = -1;
5610
5611     CustomValue[x][y] = 0;
5612
5613     InitField_WithBug2(x, y, FALSE);
5614
5615     TEST_DrawLevelField(x, y);
5616
5617     TestIfElementTouchesCustomElement(x, y);
5618
5619     if (GFX_CRUMBLED(element))
5620       TEST_DrawLevelFieldCrumbledNeighbours(x, y);
5621
5622     if (IS_PLAYER(x, y) && !PLAYERINFO(x, y)->present)
5623       StorePlayer[x][y] = 0;
5624
5625     if (ELEM_IS_PLAYER(element))
5626       RelocatePlayer(x, y, element);
5627   }
5628   else if (IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
5629   {
5630     int graphic = el_act2img(GfxElement[x][y], ACTION_EXPLODING);
5631     int frame = getGraphicAnimationFrame(graphic, GfxFrame[x][y]);
5632
5633     if (phase == delay)
5634       TEST_DrawLevelFieldCrumbled(x, y);
5635
5636     if (IS_WALKABLE_OVER(Back[x][y]) && Back[x][y] != EL_EMPTY)
5637     {
5638       DrawLevelElement(x, y, Back[x][y]);
5639       DrawGraphicThruMask(SCREENX(x), SCREENY(y), graphic, frame);
5640     }
5641     else if (IS_WALKABLE_UNDER(Back[x][y]))
5642     {
5643       DrawGraphic(SCREENX(x), SCREENY(y), graphic, frame);
5644       DrawLevelElementThruMask(x, y, Back[x][y]);
5645     }
5646     else if (!IS_WALKABLE_INSIDE(Back[x][y]))
5647       DrawGraphic(SCREENX(x), SCREENY(y), graphic, frame);
5648   }
5649 }
5650
5651 void DynaExplode(int ex, int ey)
5652 {
5653   int i, j;
5654   int dynabomb_element = Feld[ex][ey];
5655   int dynabomb_size = 1;
5656   boolean dynabomb_xl = FALSE;
5657   struct PlayerInfo *player;
5658   static int xy[4][2] =
5659   {
5660     { 0, -1 },
5661     { -1, 0 },
5662     { +1, 0 },
5663     { 0, +1 }
5664   };
5665
5666   if (IS_ACTIVE_BOMB(dynabomb_element))
5667   {
5668     player = &stored_player[dynabomb_element - EL_DYNABOMB_PLAYER_1_ACTIVE];
5669     dynabomb_size = player->dynabomb_size;
5670     dynabomb_xl = player->dynabomb_xl;
5671     player->dynabombs_left++;
5672   }
5673
5674   Explode(ex, ey, EX_PHASE_START, EX_TYPE_CENTER);
5675
5676   for (i = 0; i < NUM_DIRECTIONS; i++)
5677   {
5678     for (j = 1; j <= dynabomb_size; j++)
5679     {
5680       int x = ex + j * xy[i][0];
5681       int y = ey + j * xy[i][1];
5682       int element;
5683
5684       if (!IN_LEV_FIELD(x, y) || IS_INDESTRUCTIBLE(Feld[x][y]))
5685         break;
5686
5687       element = Feld[x][y];
5688
5689       /* do not restart explosions of fields with active bombs */
5690       if (element == EL_EXPLOSION && IS_ACTIVE_BOMB(Store2[x][y]))
5691         continue;
5692
5693       Explode(x, y, EX_PHASE_START, EX_TYPE_BORDER);
5694
5695       if (element != EL_EMPTY && element != EL_EXPLOSION &&
5696           !IS_DIGGABLE(element) && !dynabomb_xl)
5697         break;
5698     }
5699   }
5700 }
5701
5702 void Bang(int x, int y)
5703 {
5704   int element = MovingOrBlocked2Element(x, y);
5705   int explosion_type = EX_TYPE_NORMAL;
5706
5707   if (IS_PLAYER(x, y) && !PLAYER_EXPLOSION_PROTECTED(x, y))
5708   {
5709     struct PlayerInfo *player = PLAYERINFO(x, y);
5710
5711     element = Feld[x][y] = player->initial_element;
5712
5713     if (level.use_explosion_element[player->index_nr])
5714     {
5715       int explosion_element = level.explosion_element[player->index_nr];
5716
5717       if (element_info[explosion_element].explosion_type == EXPLODES_CROSS)
5718         explosion_type = EX_TYPE_CROSS;
5719       else if (element_info[explosion_element].explosion_type == EXPLODES_1X1)
5720         explosion_type = EX_TYPE_CENTER;
5721     }
5722   }
5723
5724   switch (element)
5725   {
5726     case EL_BUG:
5727     case EL_SPACESHIP:
5728     case EL_BD_BUTTERFLY:
5729     case EL_BD_FIREFLY:
5730     case EL_YAMYAM:
5731     case EL_DARK_YAMYAM:
5732     case EL_ROBOT:
5733     case EL_PACMAN:
5734     case EL_MOLE:
5735       RaiseScoreElement(element);
5736       break;
5737
5738     case EL_DYNABOMB_PLAYER_1_ACTIVE:
5739     case EL_DYNABOMB_PLAYER_2_ACTIVE:
5740     case EL_DYNABOMB_PLAYER_3_ACTIVE:
5741     case EL_DYNABOMB_PLAYER_4_ACTIVE:
5742     case EL_DYNABOMB_INCREASE_NUMBER:
5743     case EL_DYNABOMB_INCREASE_SIZE:
5744     case EL_DYNABOMB_INCREASE_POWER:
5745       explosion_type = EX_TYPE_DYNA;
5746       break;
5747
5748     case EL_DC_LANDMINE:
5749       explosion_type = EX_TYPE_CENTER;
5750       break;
5751
5752     case EL_PENGUIN:
5753     case EL_LAMP:
5754     case EL_LAMP_ACTIVE:
5755     case EL_AMOEBA_TO_DIAMOND:
5756       if (!IS_PLAYER(x, y))     /* penguin and player may be at same field */
5757         explosion_type = EX_TYPE_CENTER;
5758       break;
5759
5760     default:
5761       if (element_info[element].explosion_type == EXPLODES_CROSS)
5762         explosion_type = EX_TYPE_CROSS;
5763       else if (element_info[element].explosion_type == EXPLODES_1X1)
5764         explosion_type = EX_TYPE_CENTER;
5765       break;
5766   }
5767
5768   if (explosion_type == EX_TYPE_DYNA)
5769     DynaExplode(x, y);
5770   else
5771     Explode(x, y, EX_PHASE_START, explosion_type);
5772
5773   CheckTriggeredElementChange(x, y, element, CE_EXPLOSION_OF_X);
5774 }
5775
5776 void SplashAcid(int x, int y)
5777 {
5778   if (IN_LEV_FIELD(x - 1, y - 1) && IS_FREE(x - 1, y - 1) &&
5779       (!IN_LEV_FIELD(x - 1, y - 2) ||
5780        !CAN_FALL(MovingOrBlocked2Element(x - 1, y - 2))))
5781     Feld[x - 1][y - 1] = EL_ACID_SPLASH_LEFT;
5782
5783   if (IN_LEV_FIELD(x + 1, y - 1) && IS_FREE(x + 1, y - 1) &&
5784       (!IN_LEV_FIELD(x + 1, y - 2) ||
5785        !CAN_FALL(MovingOrBlocked2Element(x + 1, y - 2))))
5786     Feld[x + 1][y - 1] = EL_ACID_SPLASH_RIGHT;
5787
5788   PlayLevelSound(x, y, SND_ACID_SPLASHING);
5789 }
5790
5791 static void InitBeltMovement()
5792 {
5793   static int belt_base_element[4] =
5794   {
5795     EL_CONVEYOR_BELT_1_LEFT,
5796     EL_CONVEYOR_BELT_2_LEFT,
5797     EL_CONVEYOR_BELT_3_LEFT,
5798     EL_CONVEYOR_BELT_4_LEFT
5799   };
5800   static int belt_base_active_element[4] =
5801   {
5802     EL_CONVEYOR_BELT_1_LEFT_ACTIVE,
5803     EL_CONVEYOR_BELT_2_LEFT_ACTIVE,
5804     EL_CONVEYOR_BELT_3_LEFT_ACTIVE,
5805     EL_CONVEYOR_BELT_4_LEFT_ACTIVE
5806   };
5807
5808   int x, y, i, j;
5809
5810   /* set frame order for belt animation graphic according to belt direction */
5811   for (i = 0; i < NUM_BELTS; i++)
5812   {
5813     int belt_nr = i;
5814
5815     for (j = 0; j < NUM_BELT_PARTS; j++)
5816     {
5817       int element = belt_base_active_element[belt_nr] + j;
5818       int graphic_1 = el2img(element);
5819       int graphic_2 = el2panelimg(element);
5820
5821       if (game.belt_dir[i] == MV_LEFT)
5822       {
5823         graphic_info[graphic_1].anim_mode &= ~ANIM_REVERSE;
5824         graphic_info[graphic_2].anim_mode &= ~ANIM_REVERSE;
5825       }
5826       else
5827       {
5828         graphic_info[graphic_1].anim_mode |=  ANIM_REVERSE;
5829         graphic_info[graphic_2].anim_mode |=  ANIM_REVERSE;
5830       }
5831     }
5832   }
5833
5834   SCAN_PLAYFIELD(x, y)
5835   {
5836     int element = Feld[x][y];
5837
5838     for (i = 0; i < NUM_BELTS; i++)
5839     {
5840       if (IS_BELT(element) && game.belt_dir[i] != MV_NONE)
5841       {
5842         int e_belt_nr = getBeltNrFromBeltElement(element);
5843         int belt_nr = i;
5844
5845         if (e_belt_nr == belt_nr)
5846         {
5847           int belt_part = Feld[x][y] - belt_base_element[belt_nr];
5848
5849           Feld[x][y] = belt_base_active_element[belt_nr] + belt_part;
5850         }
5851       }
5852     }
5853   }
5854 }
5855
5856 static void ToggleBeltSwitch(int x, int y)
5857 {
5858   static int belt_base_element[4] =
5859   {
5860     EL_CONVEYOR_BELT_1_LEFT,
5861     EL_CONVEYOR_BELT_2_LEFT,
5862     EL_CONVEYOR_BELT_3_LEFT,
5863     EL_CONVEYOR_BELT_4_LEFT
5864   };
5865   static int belt_base_active_element[4] =
5866   {
5867     EL_CONVEYOR_BELT_1_LEFT_ACTIVE,
5868     EL_CONVEYOR_BELT_2_LEFT_ACTIVE,
5869     EL_CONVEYOR_BELT_3_LEFT_ACTIVE,
5870     EL_CONVEYOR_BELT_4_LEFT_ACTIVE
5871   };
5872   static int belt_base_switch_element[4] =
5873   {
5874     EL_CONVEYOR_BELT_1_SWITCH_LEFT,
5875     EL_CONVEYOR_BELT_2_SWITCH_LEFT,
5876     EL_CONVEYOR_BELT_3_SWITCH_LEFT,
5877     EL_CONVEYOR_BELT_4_SWITCH_LEFT
5878   };
5879   static int belt_move_dir[4] =
5880   {
5881     MV_LEFT,
5882     MV_NONE,
5883     MV_RIGHT,
5884     MV_NONE,
5885   };
5886
5887   int element = Feld[x][y];
5888   int belt_nr = getBeltNrFromBeltSwitchElement(element);
5889   int belt_dir_nr = (game.belt_dir_nr[belt_nr] + 1) % 4;
5890   int belt_dir = belt_move_dir[belt_dir_nr];
5891   int xx, yy, i;
5892
5893   if (!IS_BELT_SWITCH(element))
5894     return;
5895
5896   game.belt_dir_nr[belt_nr] = belt_dir_nr;
5897   game.belt_dir[belt_nr] = belt_dir;
5898
5899   if (belt_dir_nr == 3)
5900     belt_dir_nr = 1;
5901
5902   /* set frame order for belt animation graphic according to belt direction */
5903   for (i = 0; i < NUM_BELT_PARTS; i++)
5904   {
5905     int element = belt_base_active_element[belt_nr] + i;
5906     int graphic_1 = el2img(element);
5907     int graphic_2 = el2panelimg(element);
5908
5909     if (belt_dir == MV_LEFT)
5910     {
5911       graphic_info[graphic_1].anim_mode &= ~ANIM_REVERSE;
5912       graphic_info[graphic_2].anim_mode &= ~ANIM_REVERSE;
5913     }
5914     else
5915     {
5916       graphic_info[graphic_1].anim_mode |=  ANIM_REVERSE;
5917       graphic_info[graphic_2].anim_mode |=  ANIM_REVERSE;
5918     }
5919   }
5920
5921   SCAN_PLAYFIELD(xx, yy)
5922   {
5923     int element = Feld[xx][yy];
5924
5925     if (IS_BELT_SWITCH(element))
5926     {
5927       int e_belt_nr = getBeltNrFromBeltSwitchElement(element);
5928
5929       if (e_belt_nr == belt_nr)
5930       {
5931         Feld[xx][yy] = belt_base_switch_element[belt_nr] + belt_dir_nr;
5932         TEST_DrawLevelField(xx, yy);
5933       }
5934     }
5935     else if (IS_BELT(element) && belt_dir != MV_NONE)
5936     {
5937       int e_belt_nr = getBeltNrFromBeltElement(element);
5938
5939       if (e_belt_nr == belt_nr)
5940       {
5941         int belt_part = Feld[xx][yy] - belt_base_element[belt_nr];
5942
5943         Feld[xx][yy] = belt_base_active_element[belt_nr] + belt_part;
5944         TEST_DrawLevelField(xx, yy);
5945       }
5946     }
5947     else if (IS_BELT_ACTIVE(element) && belt_dir == MV_NONE)
5948     {
5949       int e_belt_nr = getBeltNrFromBeltActiveElement(element);
5950
5951       if (e_belt_nr == belt_nr)
5952       {
5953         int belt_part = Feld[xx][yy] - belt_base_active_element[belt_nr];
5954
5955         Feld[xx][yy] = belt_base_element[belt_nr] + belt_part;
5956         TEST_DrawLevelField(xx, yy);
5957       }
5958     }
5959   }
5960 }
5961
5962 static void ToggleSwitchgateSwitch(int x, int y)
5963 {
5964   int xx, yy;
5965
5966   game.switchgate_pos = !game.switchgate_pos;
5967
5968   SCAN_PLAYFIELD(xx, yy)
5969   {
5970     int element = Feld[xx][yy];
5971
5972     if (element == EL_SWITCHGATE_SWITCH_UP)
5973     {
5974       Feld[xx][yy] = EL_SWITCHGATE_SWITCH_DOWN;
5975       TEST_DrawLevelField(xx, yy);
5976     }
5977     else if (element == EL_SWITCHGATE_SWITCH_DOWN)
5978     {
5979       Feld[xx][yy] = EL_SWITCHGATE_SWITCH_UP;
5980       TEST_DrawLevelField(xx, yy);
5981     }
5982     else if (element == EL_DC_SWITCHGATE_SWITCH_UP)
5983     {
5984       Feld[xx][yy] = EL_DC_SWITCHGATE_SWITCH_DOWN;
5985       TEST_DrawLevelField(xx, yy);
5986     }
5987     else if (element == EL_DC_SWITCHGATE_SWITCH_DOWN)
5988     {
5989       Feld[xx][yy] = EL_DC_SWITCHGATE_SWITCH_UP;
5990       TEST_DrawLevelField(xx, yy);
5991     }
5992     else if (element == EL_SWITCHGATE_OPEN ||
5993              element == EL_SWITCHGATE_OPENING)
5994     {
5995       Feld[xx][yy] = EL_SWITCHGATE_CLOSING;
5996
5997       PlayLevelSoundAction(xx, yy, ACTION_CLOSING);
5998     }
5999     else if (element == EL_SWITCHGATE_CLOSED ||
6000              element == EL_SWITCHGATE_CLOSING)
6001     {
6002       Feld[xx][yy] = EL_SWITCHGATE_OPENING;
6003
6004       PlayLevelSoundAction(xx, yy, ACTION_OPENING);
6005     }
6006   }
6007 }
6008
6009 static int getInvisibleActiveFromInvisibleElement(int element)
6010 {
6011   return (element == EL_INVISIBLE_STEELWALL ? EL_INVISIBLE_STEELWALL_ACTIVE :
6012           element == EL_INVISIBLE_WALL      ? EL_INVISIBLE_WALL_ACTIVE :
6013           element == EL_INVISIBLE_SAND      ? EL_INVISIBLE_SAND_ACTIVE :
6014           element);
6015 }
6016
6017 static int getInvisibleFromInvisibleActiveElement(int element)
6018 {
6019   return (element == EL_INVISIBLE_STEELWALL_ACTIVE ? EL_INVISIBLE_STEELWALL :
6020           element == EL_INVISIBLE_WALL_ACTIVE      ? EL_INVISIBLE_WALL :
6021           element == EL_INVISIBLE_SAND_ACTIVE      ? EL_INVISIBLE_SAND :
6022           element);
6023 }
6024
6025 static void RedrawAllLightSwitchesAndInvisibleElements()
6026 {
6027   int x, y;
6028
6029   SCAN_PLAYFIELD(x, y)
6030   {
6031     int element = Feld[x][y];
6032
6033     if (element == EL_LIGHT_SWITCH &&
6034         game.light_time_left > 0)
6035     {
6036       Feld[x][y] = EL_LIGHT_SWITCH_ACTIVE;
6037       TEST_DrawLevelField(x, y);
6038     }
6039     else if (element == EL_LIGHT_SWITCH_ACTIVE &&
6040              game.light_time_left == 0)
6041     {
6042       Feld[x][y] = EL_LIGHT_SWITCH;
6043       TEST_DrawLevelField(x, y);
6044     }
6045     else if (element == EL_EMC_DRIPPER &&
6046              game.light_time_left > 0)
6047     {
6048       Feld[x][y] = EL_EMC_DRIPPER_ACTIVE;
6049       TEST_DrawLevelField(x, y);
6050     }
6051     else if (element == EL_EMC_DRIPPER_ACTIVE &&
6052              game.light_time_left == 0)
6053     {
6054       Feld[x][y] = EL_EMC_DRIPPER;
6055       TEST_DrawLevelField(x, y);
6056     }
6057     else if (element == EL_INVISIBLE_STEELWALL ||
6058              element == EL_INVISIBLE_WALL ||
6059              element == EL_INVISIBLE_SAND)
6060     {
6061       if (game.light_time_left > 0)
6062         Feld[x][y] = getInvisibleActiveFromInvisibleElement(element);
6063
6064       TEST_DrawLevelField(x, y);
6065
6066       /* uncrumble neighbour fields, if needed */
6067       if (element == EL_INVISIBLE_SAND)
6068         TEST_DrawLevelFieldCrumbledNeighbours(x, y);
6069     }
6070     else if (element == EL_INVISIBLE_STEELWALL_ACTIVE ||
6071              element == EL_INVISIBLE_WALL_ACTIVE ||
6072              element == EL_INVISIBLE_SAND_ACTIVE)
6073     {
6074       if (game.light_time_left == 0)
6075         Feld[x][y] = getInvisibleFromInvisibleActiveElement(element);
6076
6077       TEST_DrawLevelField(x, y);
6078
6079       /* re-crumble neighbour fields, if needed */
6080       if (element == EL_INVISIBLE_SAND)
6081         TEST_DrawLevelFieldCrumbledNeighbours(x, y);
6082     }
6083   }
6084 }
6085
6086 static void RedrawAllInvisibleElementsForLenses()
6087 {
6088   int x, y;
6089
6090   SCAN_PLAYFIELD(x, y)
6091   {
6092     int element = Feld[x][y];
6093
6094     if (element == EL_EMC_DRIPPER &&
6095         game.lenses_time_left > 0)
6096     {
6097       Feld[x][y] = EL_EMC_DRIPPER_ACTIVE;
6098       TEST_DrawLevelField(x, y);
6099     }
6100     else if (element == EL_EMC_DRIPPER_ACTIVE &&
6101              game.lenses_time_left == 0)
6102     {
6103       Feld[x][y] = EL_EMC_DRIPPER;
6104       TEST_DrawLevelField(x, y);
6105     }
6106     else if (element == EL_INVISIBLE_STEELWALL ||
6107              element == EL_INVISIBLE_WALL ||
6108              element == EL_INVISIBLE_SAND)
6109     {
6110       if (game.lenses_time_left > 0)
6111         Feld[x][y] = getInvisibleActiveFromInvisibleElement(element);
6112
6113       TEST_DrawLevelField(x, y);
6114
6115       /* uncrumble neighbour fields, if needed */
6116       if (element == EL_INVISIBLE_SAND)
6117         TEST_DrawLevelFieldCrumbledNeighbours(x, y);
6118     }
6119     else if (element == EL_INVISIBLE_STEELWALL_ACTIVE ||
6120              element == EL_INVISIBLE_WALL_ACTIVE ||
6121              element == EL_INVISIBLE_SAND_ACTIVE)
6122     {
6123       if (game.lenses_time_left == 0)
6124         Feld[x][y] = getInvisibleFromInvisibleActiveElement(element);
6125
6126       TEST_DrawLevelField(x, y);
6127
6128       /* re-crumble neighbour fields, if needed */
6129       if (element == EL_INVISIBLE_SAND)
6130         TEST_DrawLevelFieldCrumbledNeighbours(x, y);
6131     }
6132   }
6133 }
6134
6135 static void RedrawAllInvisibleElementsForMagnifier()
6136 {
6137   int x, y;
6138
6139   SCAN_PLAYFIELD(x, y)
6140   {
6141     int element = Feld[x][y];
6142
6143     if (element == EL_EMC_FAKE_GRASS &&
6144         game.magnify_time_left > 0)
6145     {
6146       Feld[x][y] = EL_EMC_FAKE_GRASS_ACTIVE;
6147       TEST_DrawLevelField(x, y);
6148     }
6149     else if (element == EL_EMC_FAKE_GRASS_ACTIVE &&
6150              game.magnify_time_left == 0)
6151     {
6152       Feld[x][y] = EL_EMC_FAKE_GRASS;
6153       TEST_DrawLevelField(x, y);
6154     }
6155     else if (IS_GATE_GRAY(element) &&
6156              game.magnify_time_left > 0)
6157     {
6158       Feld[x][y] = (IS_RND_GATE_GRAY(element) ?
6159                     element - EL_GATE_1_GRAY + EL_GATE_1_GRAY_ACTIVE :
6160                     IS_EM_GATE_GRAY(element) ?
6161                     element - EL_EM_GATE_1_GRAY + EL_EM_GATE_1_GRAY_ACTIVE :
6162                     IS_EMC_GATE_GRAY(element) ?
6163                     element - EL_EMC_GATE_5_GRAY + EL_EMC_GATE_5_GRAY_ACTIVE :
6164                     IS_DC_GATE_GRAY(element) ?
6165                     EL_DC_GATE_WHITE_GRAY_ACTIVE :
6166                     element);
6167       TEST_DrawLevelField(x, y);
6168     }
6169     else if (IS_GATE_GRAY_ACTIVE(element) &&
6170              game.magnify_time_left == 0)
6171     {
6172       Feld[x][y] = (IS_RND_GATE_GRAY_ACTIVE(element) ?
6173                     element - EL_GATE_1_GRAY_ACTIVE + EL_GATE_1_GRAY :
6174                     IS_EM_GATE_GRAY_ACTIVE(element) ?
6175                     element - EL_EM_GATE_1_GRAY_ACTIVE + EL_EM_GATE_1_GRAY :
6176                     IS_EMC_GATE_GRAY_ACTIVE(element) ?
6177                     element - EL_EMC_GATE_5_GRAY_ACTIVE + EL_EMC_GATE_5_GRAY :
6178                     IS_DC_GATE_GRAY_ACTIVE(element) ?
6179                     EL_DC_GATE_WHITE_GRAY :
6180                     element);
6181       TEST_DrawLevelField(x, y);
6182     }
6183   }
6184 }
6185
6186 static void ToggleLightSwitch(int x, int y)
6187 {
6188   int element = Feld[x][y];
6189
6190   game.light_time_left =
6191     (element == EL_LIGHT_SWITCH ?
6192      level.time_light * FRAMES_PER_SECOND : 0);
6193
6194   RedrawAllLightSwitchesAndInvisibleElements();
6195 }
6196
6197 static void ActivateTimegateSwitch(int x, int y)
6198 {
6199   int xx, yy;
6200
6201   game.timegate_time_left = level.time_timegate * FRAMES_PER_SECOND;
6202
6203   SCAN_PLAYFIELD(xx, yy)
6204   {
6205     int element = Feld[xx][yy];
6206
6207     if (element == EL_TIMEGATE_CLOSED ||
6208         element == EL_TIMEGATE_CLOSING)
6209     {
6210       Feld[xx][yy] = EL_TIMEGATE_OPENING;
6211       PlayLevelSound(xx, yy, SND_CLASS_TIMEGATE_OPENING);
6212     }
6213
6214     /*
6215     else if (element == EL_TIMEGATE_SWITCH_ACTIVE)
6216     {
6217       Feld[xx][yy] = EL_TIMEGATE_SWITCH;
6218       TEST_DrawLevelField(xx, yy);
6219     }
6220     */
6221
6222   }
6223
6224   Feld[x][y] = (Feld[x][y] == EL_TIMEGATE_SWITCH ? EL_TIMEGATE_SWITCH_ACTIVE :
6225                 EL_DC_TIMEGATE_SWITCH_ACTIVE);
6226 }
6227
6228 void Impact(int x, int y)
6229 {
6230   boolean last_line = (y == lev_fieldy - 1);
6231   boolean object_hit = FALSE;
6232   boolean impact = (last_line || object_hit);
6233   int element = Feld[x][y];
6234   int smashed = EL_STEELWALL;
6235
6236   if (!last_line)       /* check if element below was hit */
6237   {
6238     if (Feld[x][y + 1] == EL_PLAYER_IS_LEAVING)
6239       return;
6240
6241     object_hit = (!IS_FREE(x, y + 1) && (!IS_MOVING(x, y + 1) ||
6242                                          MovDir[x][y + 1] != MV_DOWN ||
6243                                          MovPos[x][y + 1] <= TILEY / 2));
6244
6245     /* do not smash moving elements that left the smashed field in time */
6246     if (game.engine_version >= VERSION_IDENT(2,2,0,7) && IS_MOVING(x, y + 1) &&
6247         ABS(MovPos[x][y + 1] + getElementMoveStepsize(x, y + 1)) >= TILEX)
6248       object_hit = FALSE;
6249
6250 #if USE_QUICKSAND_IMPACT_BUGFIX
6251     if (Feld[x][y + 1] == EL_QUICKSAND_EMPTYING && object_hit == FALSE)
6252     {
6253       RemoveMovingField(x, y + 1);
6254       Feld[x][y + 1] = EL_QUICKSAND_EMPTY;
6255       Feld[x][y + 2] = EL_ROCK;
6256       TEST_DrawLevelField(x, y + 2);
6257
6258       object_hit = TRUE;
6259     }
6260
6261     if (Feld[x][y + 1] == EL_QUICKSAND_FAST_EMPTYING && object_hit == FALSE)
6262     {
6263       RemoveMovingField(x, y + 1);
6264       Feld[x][y + 1] = EL_QUICKSAND_FAST_EMPTY;
6265       Feld[x][y + 2] = EL_ROCK;
6266       TEST_DrawLevelField(x, y + 2);
6267
6268       object_hit = TRUE;
6269     }
6270 #endif
6271
6272     if (object_hit)
6273       smashed = MovingOrBlocked2Element(x, y + 1);
6274
6275     impact = (last_line || object_hit);
6276   }
6277
6278   if (!last_line && smashed == EL_ACID) /* element falls into acid */
6279   {
6280     SplashAcid(x, y + 1);
6281     return;
6282   }
6283
6284   /* !!! not sufficient for all cases -- see EL_PEARL below !!! */
6285   /* only reset graphic animation if graphic really changes after impact */
6286   if (impact &&
6287       el_act_dir2img(element, GfxAction[x][y], MV_DOWN) != el2img(element))
6288   {
6289     ResetGfxAnimation(x, y);
6290     TEST_DrawLevelField(x, y);
6291   }
6292
6293   if (impact && CAN_EXPLODE_IMPACT(element))
6294   {
6295     Bang(x, y);
6296     return;
6297   }
6298   else if (impact && element == EL_PEARL &&
6299            smashed != EL_DC_MAGIC_WALL && smashed != EL_DC_MAGIC_WALL_ACTIVE)
6300   {
6301     ResetGfxAnimation(x, y);
6302
6303     Feld[x][y] = EL_PEARL_BREAKING;
6304     PlayLevelSound(x, y, SND_PEARL_BREAKING);
6305     return;
6306   }
6307   else if (impact && CheckElementChange(x, y, element, smashed, CE_IMPACT))
6308   {
6309     PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
6310
6311     return;
6312   }
6313
6314   if (impact && element == EL_AMOEBA_DROP)
6315   {
6316     if (object_hit && IS_PLAYER(x, y + 1))
6317       KillPlayerUnlessEnemyProtected(x, y + 1);
6318     else if (object_hit && smashed == EL_PENGUIN)
6319       Bang(x, y + 1);
6320     else
6321     {
6322       Feld[x][y] = EL_AMOEBA_GROWING;
6323       Store[x][y] = EL_AMOEBA_WET;
6324
6325       ResetRandomAnimationValue(x, y);
6326     }
6327     return;
6328   }
6329
6330   if (object_hit)               /* check which object was hit */
6331   {
6332     if ((CAN_PASS_MAGIC_WALL(element) &&
6333          (smashed == EL_MAGIC_WALL ||
6334           smashed == EL_BD_MAGIC_WALL)) ||
6335         (CAN_PASS_DC_MAGIC_WALL(element) &&
6336          smashed == EL_DC_MAGIC_WALL))
6337     {
6338       int xx, yy;
6339       int activated_magic_wall =
6340         (smashed == EL_MAGIC_WALL ? EL_MAGIC_WALL_ACTIVE :
6341          smashed == EL_BD_MAGIC_WALL ? EL_BD_MAGIC_WALL_ACTIVE :
6342          EL_DC_MAGIC_WALL_ACTIVE);
6343
6344       /* activate magic wall / mill */
6345       SCAN_PLAYFIELD(xx, yy)
6346       {
6347         if (Feld[xx][yy] == smashed)
6348           Feld[xx][yy] = activated_magic_wall;
6349       }
6350
6351       game.magic_wall_time_left = level.time_magic_wall * FRAMES_PER_SECOND;
6352       game.magic_wall_active = TRUE;
6353
6354       PlayLevelSound(x, y, (smashed == EL_MAGIC_WALL ?
6355                             SND_MAGIC_WALL_ACTIVATING :
6356                             smashed == EL_BD_MAGIC_WALL ?
6357                             SND_BD_MAGIC_WALL_ACTIVATING :
6358                             SND_DC_MAGIC_WALL_ACTIVATING));
6359     }
6360
6361     if (IS_PLAYER(x, y + 1))
6362     {
6363       if (CAN_SMASH_PLAYER(element))
6364       {
6365         KillPlayerUnlessEnemyProtected(x, y + 1);
6366         return;
6367       }
6368     }
6369     else if (smashed == EL_PENGUIN)
6370     {
6371       if (CAN_SMASH_PLAYER(element))
6372       {
6373         Bang(x, y + 1);
6374         return;
6375       }
6376     }
6377     else if (element == EL_BD_DIAMOND)
6378     {
6379       if (IS_CLASSIC_ENEMY(smashed) && IS_BD_ELEMENT(smashed))
6380       {
6381         Bang(x, y + 1);
6382         return;
6383       }
6384     }
6385     else if (((element == EL_SP_INFOTRON ||
6386                element == EL_SP_ZONK) &&
6387               (smashed == EL_SP_SNIKSNAK ||
6388                smashed == EL_SP_ELECTRON ||
6389                smashed == EL_SP_DISK_ORANGE)) ||
6390              (element == EL_SP_INFOTRON &&
6391               smashed == EL_SP_DISK_YELLOW))
6392     {
6393       Bang(x, y + 1);
6394       return;
6395     }
6396     else if (CAN_SMASH_EVERYTHING(element))
6397     {
6398       if (IS_CLASSIC_ENEMY(smashed) ||
6399           CAN_EXPLODE_SMASHED(smashed))
6400       {
6401         Bang(x, y + 1);
6402         return;
6403       }
6404       else if (!IS_MOVING(x, y + 1) && !IS_BLOCKED(x, y + 1))
6405       {
6406         if (smashed == EL_LAMP ||
6407             smashed == EL_LAMP_ACTIVE)
6408         {
6409           Bang(x, y + 1);
6410           return;
6411         }
6412         else if (smashed == EL_NUT)
6413         {
6414           Feld[x][y + 1] = EL_NUT_BREAKING;
6415           PlayLevelSound(x, y, SND_NUT_BREAKING);
6416           RaiseScoreElement(EL_NUT);
6417           return;
6418         }
6419         else if (smashed == EL_PEARL)
6420         {
6421           ResetGfxAnimation(x, y);
6422
6423           Feld[x][y + 1] = EL_PEARL_BREAKING;
6424           PlayLevelSound(x, y, SND_PEARL_BREAKING);
6425           return;
6426         }
6427         else if (smashed == EL_DIAMOND)
6428         {
6429           Feld[x][y + 1] = EL_DIAMOND_BREAKING;
6430           PlayLevelSound(x, y, SND_DIAMOND_BREAKING);
6431           return;
6432         }
6433         else if (IS_BELT_SWITCH(smashed))
6434         {
6435           ToggleBeltSwitch(x, y + 1);
6436         }
6437         else if (smashed == EL_SWITCHGATE_SWITCH_UP ||
6438                  smashed == EL_SWITCHGATE_SWITCH_DOWN ||
6439                  smashed == EL_DC_SWITCHGATE_SWITCH_UP ||
6440                  smashed == EL_DC_SWITCHGATE_SWITCH_DOWN)
6441         {
6442           ToggleSwitchgateSwitch(x, y + 1);
6443         }
6444         else if (smashed == EL_LIGHT_SWITCH ||
6445                  smashed == EL_LIGHT_SWITCH_ACTIVE)
6446         {
6447           ToggleLightSwitch(x, y + 1);
6448         }
6449         else
6450         {
6451           CheckElementChange(x, y + 1, smashed, element, CE_SMASHED);
6452
6453           CheckElementChangeBySide(x, y + 1, smashed, element,
6454                                    CE_SWITCHED, CH_SIDE_TOP);
6455           CheckTriggeredElementChangeBySide(x, y + 1, smashed, CE_SWITCH_OF_X,
6456                                             CH_SIDE_TOP);
6457         }
6458       }
6459       else
6460       {
6461         CheckElementChange(x, y + 1, smashed, element, CE_SMASHED);
6462       }
6463     }
6464   }
6465
6466   /* play sound of magic wall / mill */
6467   if (!last_line &&
6468       (Feld[x][y + 1] == EL_MAGIC_WALL_ACTIVE ||
6469        Feld[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE ||
6470        Feld[x][y + 1] == EL_DC_MAGIC_WALL_ACTIVE))
6471   {
6472     if (Feld[x][y + 1] == EL_MAGIC_WALL_ACTIVE)
6473       PlayLevelSound(x, y, SND_MAGIC_WALL_FILLING);
6474     else if (Feld[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE)
6475       PlayLevelSound(x, y, SND_BD_MAGIC_WALL_FILLING);
6476     else if (Feld[x][y + 1] == EL_DC_MAGIC_WALL_ACTIVE)
6477       PlayLevelSound(x, y, SND_DC_MAGIC_WALL_FILLING);
6478
6479     return;
6480   }
6481
6482   /* play sound of object that hits the ground */
6483   if (last_line || object_hit)
6484     PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
6485 }
6486
6487 inline static void TurnRoundExt(int x, int y)
6488 {
6489   static struct
6490   {
6491     int dx, dy;
6492   } move_xy[] =
6493   {
6494     {  0,  0 },
6495     { -1,  0 },
6496     { +1,  0 },
6497     {  0,  0 },
6498     {  0, -1 },
6499     {  0,  0 }, { 0, 0 }, { 0, 0 },
6500     {  0, +1 }
6501   };
6502   static struct
6503   {
6504     int left, right, back;
6505   } turn[] =
6506   {
6507     { 0,        0,              0        },
6508     { MV_DOWN,  MV_UP,          MV_RIGHT },
6509     { MV_UP,    MV_DOWN,        MV_LEFT  },
6510     { 0,        0,              0        },
6511     { MV_LEFT,  MV_RIGHT,       MV_DOWN  },
6512     { 0,        0,              0        },
6513     { 0,        0,              0        },
6514     { 0,        0,              0        },
6515     { MV_RIGHT, MV_LEFT,        MV_UP    }
6516   };
6517
6518   int element = Feld[x][y];
6519   int move_pattern = element_info[element].move_pattern;
6520
6521   int old_move_dir = MovDir[x][y];
6522   int left_dir  = turn[old_move_dir].left;
6523   int right_dir = turn[old_move_dir].right;
6524   int back_dir  = turn[old_move_dir].back;
6525
6526   int left_dx  = move_xy[left_dir].dx,     left_dy  = move_xy[left_dir].dy;
6527   int right_dx = move_xy[right_dir].dx,    right_dy = move_xy[right_dir].dy;
6528   int move_dx  = move_xy[old_move_dir].dx, move_dy  = move_xy[old_move_dir].dy;
6529   int back_dx  = move_xy[back_dir].dx,     back_dy  = move_xy[back_dir].dy;
6530
6531   int left_x  = x + left_dx,  left_y  = y + left_dy;
6532   int right_x = x + right_dx, right_y = y + right_dy;
6533   int move_x  = x + move_dx,  move_y  = y + move_dy;
6534
6535   int xx, yy;
6536
6537   if (element == EL_BUG || element == EL_BD_BUTTERFLY)
6538   {
6539     TestIfBadThingTouchesOtherBadThing(x, y);
6540
6541     if (ENEMY_CAN_ENTER_FIELD(element, right_x, right_y))
6542       MovDir[x][y] = right_dir;
6543     else if (!ENEMY_CAN_ENTER_FIELD(element, move_x, move_y))
6544       MovDir[x][y] = left_dir;
6545
6546     if (element == EL_BUG && MovDir[x][y] != old_move_dir)
6547       MovDelay[x][y] = 9;
6548     else if (element == EL_BD_BUTTERFLY)     /* && MovDir[x][y] == left_dir) */
6549       MovDelay[x][y] = 1;
6550   }
6551   else if (element == EL_SPACESHIP || element == EL_BD_FIREFLY)
6552   {
6553     TestIfBadThingTouchesOtherBadThing(x, y);
6554
6555     if (ENEMY_CAN_ENTER_FIELD(element, left_x, left_y))
6556       MovDir[x][y] = left_dir;
6557     else if (!ENEMY_CAN_ENTER_FIELD(element, move_x, move_y))
6558       MovDir[x][y] = right_dir;
6559
6560     if (element == EL_SPACESHIP && MovDir[x][y] != old_move_dir)
6561       MovDelay[x][y] = 9;
6562     else if (element == EL_BD_FIREFLY)      /* && MovDir[x][y] == right_dir) */
6563       MovDelay[x][y] = 1;
6564   }
6565   else if (element == EL_SP_SNIKSNAK || element == EL_SP_ELECTRON)
6566   {
6567     TestIfBadThingTouchesOtherBadThing(x, y);
6568
6569     if (ELEMENT_CAN_ENTER_FIELD_BASE_4(element, left_x, left_y, 0))
6570       MovDir[x][y] = left_dir;
6571     else if (!ELEMENT_CAN_ENTER_FIELD_BASE_4(element, move_x, move_y, 0))
6572       MovDir[x][y] = right_dir;
6573
6574     if (MovDir[x][y] != old_move_dir)
6575       MovDelay[x][y] = 9;
6576   }
6577   else if (element == EL_YAMYAM)
6578   {
6579     boolean can_turn_left  = YAMYAM_CAN_ENTER_FIELD(element, left_x, left_y);
6580     boolean can_turn_right = YAMYAM_CAN_ENTER_FIELD(element, right_x, right_y);
6581
6582     if (can_turn_left && can_turn_right)
6583       MovDir[x][y] = (RND(3) ? (RND(2) ? left_dir : right_dir) : back_dir);
6584     else if (can_turn_left)
6585       MovDir[x][y] = (RND(2) ? left_dir : back_dir);
6586     else if (can_turn_right)
6587       MovDir[x][y] = (RND(2) ? right_dir : back_dir);
6588     else
6589       MovDir[x][y] = back_dir;
6590
6591     MovDelay[x][y] = 16 + 16 * RND(3);
6592   }
6593   else if (element == EL_DARK_YAMYAM)
6594   {
6595     boolean can_turn_left  = DARK_YAMYAM_CAN_ENTER_FIELD(element,
6596                                                          left_x, left_y);
6597     boolean can_turn_right = DARK_YAMYAM_CAN_ENTER_FIELD(element,
6598                                                          right_x, right_y);
6599
6600     if (can_turn_left && can_turn_right)
6601       MovDir[x][y] = (RND(3) ? (RND(2) ? left_dir : right_dir) : back_dir);
6602     else if (can_turn_left)
6603       MovDir[x][y] = (RND(2) ? left_dir : back_dir);
6604     else if (can_turn_right)
6605       MovDir[x][y] = (RND(2) ? right_dir : back_dir);
6606     else
6607       MovDir[x][y] = back_dir;
6608
6609     MovDelay[x][y] = 16 + 16 * RND(3);
6610   }
6611   else if (element == EL_PACMAN)
6612   {
6613     boolean can_turn_left  = PACMAN_CAN_ENTER_FIELD(element, left_x, left_y);
6614     boolean can_turn_right = PACMAN_CAN_ENTER_FIELD(element, right_x, right_y);
6615
6616     if (can_turn_left && can_turn_right)
6617       MovDir[x][y] = (RND(3) ? (RND(2) ? left_dir : right_dir) : back_dir);
6618     else if (can_turn_left)
6619       MovDir[x][y] = (RND(2) ? left_dir : back_dir);
6620     else if (can_turn_right)
6621       MovDir[x][y] = (RND(2) ? right_dir : back_dir);
6622     else
6623       MovDir[x][y] = back_dir;
6624
6625     MovDelay[x][y] = 6 + RND(40);
6626   }
6627   else if (element == EL_PIG)
6628   {
6629     boolean can_turn_left  = PIG_CAN_ENTER_FIELD(element, left_x, left_y);
6630     boolean can_turn_right = PIG_CAN_ENTER_FIELD(element, right_x, right_y);
6631     boolean can_move_on    = PIG_CAN_ENTER_FIELD(element, move_x, move_y);
6632     boolean should_turn_left, should_turn_right, should_move_on;
6633     int rnd_value = 24;
6634     int rnd = RND(rnd_value);
6635
6636     should_turn_left = (can_turn_left &&
6637                         (!can_move_on ||
6638                          IN_LEV_FIELD_AND_NOT_FREE(x + back_dx + left_dx,
6639                                                    y + back_dy + left_dy)));
6640     should_turn_right = (can_turn_right &&
6641                          (!can_move_on ||
6642                           IN_LEV_FIELD_AND_NOT_FREE(x + back_dx + right_dx,
6643                                                     y + back_dy + right_dy)));
6644     should_move_on = (can_move_on &&
6645                       (!can_turn_left ||
6646                        !can_turn_right ||
6647                        IN_LEV_FIELD_AND_NOT_FREE(x + move_dx + left_dx,
6648                                                  y + move_dy + left_dy) ||
6649                        IN_LEV_FIELD_AND_NOT_FREE(x + move_dx + right_dx,
6650                                                  y + move_dy + right_dy)));
6651
6652     if (should_turn_left || should_turn_right || should_move_on)
6653     {
6654       if (should_turn_left && should_turn_right && should_move_on)
6655         MovDir[x][y] = (rnd < rnd_value / 3     ? left_dir :
6656                         rnd < 2 * rnd_value / 3 ? right_dir :
6657                         old_move_dir);
6658       else if (should_turn_left && should_turn_right)
6659         MovDir[x][y] = (rnd < rnd_value / 2 ? left_dir : right_dir);
6660       else if (should_turn_left && should_move_on)
6661         MovDir[x][y] = (rnd < rnd_value / 2 ? left_dir : old_move_dir);
6662       else if (should_turn_right && should_move_on)
6663         MovDir[x][y] = (rnd < rnd_value / 2 ? right_dir : old_move_dir);
6664       else if (should_turn_left)
6665         MovDir[x][y] = left_dir;
6666       else if (should_turn_right)
6667         MovDir[x][y] = right_dir;
6668       else if (should_move_on)
6669         MovDir[x][y] = old_move_dir;
6670     }
6671     else if (can_move_on && rnd > rnd_value / 8)
6672       MovDir[x][y] = old_move_dir;
6673     else if (can_turn_left && can_turn_right)
6674       MovDir[x][y] = (rnd < rnd_value / 2 ? left_dir : right_dir);
6675     else if (can_turn_left && rnd > rnd_value / 8)
6676       MovDir[x][y] = left_dir;
6677     else if (can_turn_right && rnd > rnd_value/8)
6678       MovDir[x][y] = right_dir;
6679     else
6680       MovDir[x][y] = back_dir;
6681
6682     xx = x + move_xy[MovDir[x][y]].dx;
6683     yy = y + move_xy[MovDir[x][y]].dy;
6684
6685     if (!IN_LEV_FIELD(xx, yy) ||
6686         (!IS_FREE(xx, yy) && !IS_FOOD_PIG(Feld[xx][yy])))
6687       MovDir[x][y] = old_move_dir;
6688
6689     MovDelay[x][y] = 0;
6690   }
6691   else if (element == EL_DRAGON)
6692   {
6693     boolean can_turn_left  = DRAGON_CAN_ENTER_FIELD(element, left_x, left_y);
6694     boolean can_turn_right = DRAGON_CAN_ENTER_FIELD(element, right_x, right_y);
6695     boolean can_move_on    = DRAGON_CAN_ENTER_FIELD(element, move_x, move_y);
6696     int rnd_value = 24;
6697     int rnd = RND(rnd_value);
6698
6699     if (can_move_on && rnd > rnd_value / 8)
6700       MovDir[x][y] = old_move_dir;
6701     else if (can_turn_left && can_turn_right)
6702       MovDir[x][y] = (rnd < rnd_value / 2 ? left_dir : right_dir);
6703     else if (can_turn_left && rnd > rnd_value / 8)
6704       MovDir[x][y] = left_dir;
6705     else if (can_turn_right && rnd > rnd_value / 8)
6706       MovDir[x][y] = right_dir;
6707     else
6708       MovDir[x][y] = back_dir;
6709
6710     xx = x + move_xy[MovDir[x][y]].dx;
6711     yy = y + move_xy[MovDir[x][y]].dy;
6712
6713     if (!IN_LEV_FIELD_AND_IS_FREE(xx, yy))
6714       MovDir[x][y] = old_move_dir;
6715
6716     MovDelay[x][y] = 0;
6717   }
6718   else if (element == EL_MOLE)
6719   {
6720     boolean can_move_on =
6721       (MOLE_CAN_ENTER_FIELD(element, move_x, move_y,
6722                             IS_AMOEBOID(Feld[move_x][move_y]) ||
6723                             Feld[move_x][move_y] == EL_AMOEBA_SHRINKING));
6724     if (!can_move_on)
6725     {
6726       boolean can_turn_left =
6727         (MOLE_CAN_ENTER_FIELD(element, left_x, left_y,
6728                               IS_AMOEBOID(Feld[left_x][left_y])));
6729
6730       boolean can_turn_right =
6731         (MOLE_CAN_ENTER_FIELD(element, right_x, right_y,
6732                               IS_AMOEBOID(Feld[right_x][right_y])));
6733
6734       if (can_turn_left && can_turn_right)
6735         MovDir[x][y] = (RND(2) ? left_dir : right_dir);
6736       else if (can_turn_left)
6737         MovDir[x][y] = left_dir;
6738       else
6739         MovDir[x][y] = right_dir;
6740     }
6741
6742     if (MovDir[x][y] != old_move_dir)
6743       MovDelay[x][y] = 9;
6744   }
6745   else if (element == EL_BALLOON)
6746   {
6747     MovDir[x][y] = game.wind_direction;
6748     MovDelay[x][y] = 0;
6749   }
6750   else if (element == EL_SPRING)
6751   {
6752     if (MovDir[x][y] & MV_HORIZONTAL)
6753     {
6754       if (SPRING_CAN_BUMP_FROM_FIELD(move_x, move_y) &&
6755           !SPRING_CAN_ENTER_FIELD(element, x, y + 1))
6756       {
6757         Feld[move_x][move_y] = EL_EMC_SPRING_BUMPER_ACTIVE;
6758         ResetGfxAnimation(move_x, move_y);
6759         TEST_DrawLevelField(move_x, move_y);
6760
6761         MovDir[x][y] = back_dir;
6762       }
6763       else if (!SPRING_CAN_ENTER_FIELD(element, move_x, move_y) ||
6764                SPRING_CAN_ENTER_FIELD(element, x, y + 1))
6765         MovDir[x][y] = MV_NONE;
6766     }
6767
6768     MovDelay[x][y] = 0;
6769   }
6770   else if (element == EL_ROBOT ||
6771            element == EL_SATELLITE ||
6772            element == EL_PENGUIN ||
6773            element == EL_EMC_ANDROID)
6774   {
6775     int attr_x = -1, attr_y = -1;
6776
6777     if (AllPlayersGone)
6778     {
6779       attr_x = ExitX;
6780       attr_y = ExitY;
6781     }
6782     else
6783     {
6784       int i;
6785
6786       for (i = 0; i < MAX_PLAYERS; i++)
6787       {
6788         struct PlayerInfo *player = &stored_player[i];
6789         int jx = player->jx, jy = player->jy;
6790
6791         if (!player->active)
6792           continue;
6793
6794         if (attr_x == -1 ||
6795             ABS(jx - x) + ABS(jy - y) < ABS(attr_x - x) + ABS(attr_y - y))
6796         {
6797           attr_x = jx;
6798           attr_y = jy;
6799         }
6800       }
6801     }
6802
6803     if (element == EL_ROBOT && ZX >= 0 && ZY >= 0 &&
6804         (Feld[ZX][ZY] == EL_ROBOT_WHEEL_ACTIVE ||
6805          game.engine_version < VERSION_IDENT(3,1,0,0)))
6806     {
6807       attr_x = ZX;
6808       attr_y = ZY;
6809     }
6810
6811     if (element == EL_PENGUIN)
6812     {
6813       int i;
6814       static int xy[4][2] =
6815       {
6816         { 0, -1 },
6817         { -1, 0 },
6818         { +1, 0 },
6819         { 0, +1 }
6820       };
6821
6822       for (i = 0; i < NUM_DIRECTIONS; i++)
6823       {
6824         int ex = x + xy[i][0];
6825         int ey = y + xy[i][1];
6826
6827         if (IN_LEV_FIELD(ex, ey) && (Feld[ex][ey] == EL_EXIT_OPEN ||
6828                                      Feld[ex][ey] == EL_EM_EXIT_OPEN ||
6829                                      Feld[ex][ey] == EL_STEEL_EXIT_OPEN ||
6830                                      Feld[ex][ey] == EL_EM_STEEL_EXIT_OPEN))
6831         {
6832           attr_x = ex;
6833           attr_y = ey;
6834           break;
6835         }
6836       }
6837     }
6838
6839     MovDir[x][y] = MV_NONE;
6840     if (attr_x < x)
6841       MovDir[x][y] |= (AllPlayersGone ? MV_RIGHT : MV_LEFT);
6842     else if (attr_x > x)
6843       MovDir[x][y] |= (AllPlayersGone ? MV_LEFT : MV_RIGHT);
6844     if (attr_y < y)
6845       MovDir[x][y] |= (AllPlayersGone ? MV_DOWN : MV_UP);
6846     else if (attr_y > y)
6847       MovDir[x][y] |= (AllPlayersGone ? MV_UP : MV_DOWN);
6848
6849     if (element == EL_ROBOT)
6850     {
6851       int newx, newy;
6852
6853       if (MovDir[x][y] & MV_HORIZONTAL && MovDir[x][y] & MV_VERTICAL)
6854         MovDir[x][y] &= (RND(2) ? MV_HORIZONTAL : MV_VERTICAL);
6855       Moving2Blocked(x, y, &newx, &newy);
6856
6857       if (IN_LEV_FIELD(newx, newy) && IS_FREE_OR_PLAYER(newx, newy))
6858         MovDelay[x][y] = 8 + 8 * !RND(3);
6859       else
6860         MovDelay[x][y] = 16;
6861     }
6862     else if (element == EL_PENGUIN)
6863     {
6864       int newx, newy;
6865
6866       MovDelay[x][y] = 1;
6867
6868       if (MovDir[x][y] & MV_HORIZONTAL && MovDir[x][y] & MV_VERTICAL)
6869       {
6870         boolean first_horiz = RND(2);
6871         int new_move_dir = MovDir[x][y];
6872
6873         MovDir[x][y] =
6874           new_move_dir & (first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
6875         Moving2Blocked(x, y, &newx, &newy);
6876
6877         if (PENGUIN_CAN_ENTER_FIELD(element, newx, newy))
6878           return;
6879
6880         MovDir[x][y] =
6881           new_move_dir & (!first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
6882         Moving2Blocked(x, y, &newx, &newy);
6883
6884         if (PENGUIN_CAN_ENTER_FIELD(element, newx, newy))
6885           return;
6886
6887         MovDir[x][y] = old_move_dir;
6888         return;
6889       }
6890     }
6891     else if (element == EL_SATELLITE)
6892     {
6893       int newx, newy;
6894
6895       MovDelay[x][y] = 1;
6896
6897       if (MovDir[x][y] & MV_HORIZONTAL && MovDir[x][y] & MV_VERTICAL)
6898       {
6899         boolean first_horiz = RND(2);
6900         int new_move_dir = MovDir[x][y];
6901
6902         MovDir[x][y] =
6903           new_move_dir & (first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
6904         Moving2Blocked(x, y, &newx, &newy);
6905
6906         if (SATELLITE_CAN_ENTER_FIELD(newx, newy))
6907           return;
6908
6909         MovDir[x][y] =
6910           new_move_dir & (!first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
6911         Moving2Blocked(x, y, &newx, &newy);
6912
6913         if (SATELLITE_CAN_ENTER_FIELD(newx, newy))
6914           return;
6915
6916         MovDir[x][y] = old_move_dir;
6917         return;
6918       }
6919     }
6920     else if (element == EL_EMC_ANDROID)
6921     {
6922       static int check_pos[16] =
6923       {
6924         -1,             /*  0 => (invalid)          */
6925         7,              /*  1 => MV_LEFT            */
6926         3,              /*  2 => MV_RIGHT           */
6927         -1,             /*  3 => (invalid)          */
6928         1,              /*  4 =>            MV_UP   */
6929         0,              /*  5 => MV_LEFT  | MV_UP   */
6930         2,              /*  6 => MV_RIGHT | MV_UP   */
6931         -1,             /*  7 => (invalid)          */
6932         5,              /*  8 =>            MV_DOWN */
6933         6,              /*  9 => MV_LEFT  | MV_DOWN */
6934         4,              /* 10 => MV_RIGHT | MV_DOWN */
6935         -1,             /* 11 => (invalid)          */
6936         -1,             /* 12 => (invalid)          */
6937         -1,             /* 13 => (invalid)          */
6938         -1,             /* 14 => (invalid)          */
6939         -1,             /* 15 => (invalid)          */
6940       };
6941       static struct
6942       {
6943         int dx, dy;
6944         int dir;
6945       } check_xy[8] =
6946       {
6947         { -1, -1,       MV_LEFT  | MV_UP   },
6948         {  0, -1,                  MV_UP   },
6949         { +1, -1,       MV_RIGHT | MV_UP   },
6950         { +1,  0,       MV_RIGHT           },
6951         { +1, +1,       MV_RIGHT | MV_DOWN },
6952         {  0, +1,                  MV_DOWN },
6953         { -1, +1,       MV_LEFT  | MV_DOWN },
6954         { -1,  0,       MV_LEFT            },
6955       };
6956       int start_pos, check_order;
6957       boolean can_clone = FALSE;
6958       int i;
6959
6960       /* check if there is any free field around current position */
6961       for (i = 0; i < 8; i++)
6962       {
6963         int newx = x + check_xy[i].dx;
6964         int newy = y + check_xy[i].dy;
6965
6966         if (IN_LEV_FIELD_AND_IS_FREE(newx, newy))
6967         {
6968           can_clone = TRUE;
6969
6970           break;
6971         }
6972       }
6973
6974       if (can_clone)            /* randomly find an element to clone */
6975       {
6976         can_clone = FALSE;
6977
6978         start_pos = check_pos[RND(8)];
6979         check_order = (RND(2) ? -1 : +1);
6980
6981         for (i = 0; i < 8; i++)
6982         {
6983           int pos_raw = start_pos + i * check_order;
6984           int pos = (pos_raw + 8) % 8;
6985           int newx = x + check_xy[pos].dx;
6986           int newy = y + check_xy[pos].dy;
6987
6988           if (ANDROID_CAN_CLONE_FIELD(newx, newy))
6989           {
6990             element_info[element].move_leave_type = LEAVE_TYPE_LIMITED;
6991             element_info[element].move_leave_element = EL_TRIGGER_ELEMENT;
6992
6993             Store[x][y] = Feld[newx][newy];
6994
6995             can_clone = TRUE;
6996
6997             break;
6998           }
6999         }
7000       }
7001
7002       if (can_clone)            /* randomly find a direction to move */
7003       {
7004         can_clone = FALSE;
7005
7006         start_pos = check_pos[RND(8)];
7007         check_order = (RND(2) ? -1 : +1);
7008
7009         for (i = 0; i < 8; i++)
7010         {
7011           int pos_raw = start_pos + i * check_order;
7012           int pos = (pos_raw + 8) % 8;
7013           int newx = x + check_xy[pos].dx;
7014           int newy = y + check_xy[pos].dy;
7015           int new_move_dir = check_xy[pos].dir;
7016
7017           if (IN_LEV_FIELD_AND_IS_FREE(newx, newy))
7018           {
7019             MovDir[x][y] = new_move_dir;
7020             MovDelay[x][y] = level.android_clone_time * 8 + 1;
7021
7022             can_clone = TRUE;
7023
7024             break;
7025           }
7026         }
7027       }
7028
7029       if (can_clone)            /* cloning and moving successful */
7030         return;
7031
7032       /* cannot clone -- try to move towards player */
7033
7034       start_pos = check_pos[MovDir[x][y] & 0x0f];
7035       check_order = (RND(2) ? -1 : +1);
7036
7037       for (i = 0; i < 3; i++)
7038       {
7039         /* first check start_pos, then previous/next or (next/previous) pos */
7040         int pos_raw = start_pos + (i < 2 ? i : -1) * check_order;
7041         int pos = (pos_raw + 8) % 8;
7042         int newx = x + check_xy[pos].dx;
7043         int newy = y + check_xy[pos].dy;
7044         int new_move_dir = check_xy[pos].dir;
7045
7046         if (IS_PLAYER(newx, newy))
7047           break;
7048
7049         if (ANDROID_CAN_ENTER_FIELD(element, newx, newy))
7050         {
7051           MovDir[x][y] = new_move_dir;
7052           MovDelay[x][y] = level.android_move_time * 8 + 1;
7053
7054           break;
7055         }
7056       }
7057     }
7058   }
7059   else if (move_pattern == MV_TURNING_LEFT ||
7060            move_pattern == MV_TURNING_RIGHT ||
7061            move_pattern == MV_TURNING_LEFT_RIGHT ||
7062            move_pattern == MV_TURNING_RIGHT_LEFT ||
7063            move_pattern == MV_TURNING_RANDOM ||
7064            move_pattern == MV_ALL_DIRECTIONS)
7065   {
7066     boolean can_turn_left =
7067       CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, left_x, left_y);
7068     boolean can_turn_right =
7069       CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, right_x,right_y);
7070
7071     if (element_info[element].move_stepsize == 0)       /* "not moving" */
7072       return;
7073
7074     if (move_pattern == MV_TURNING_LEFT)
7075       MovDir[x][y] = left_dir;
7076     else if (move_pattern == MV_TURNING_RIGHT)
7077       MovDir[x][y] = right_dir;
7078     else if (move_pattern == MV_TURNING_LEFT_RIGHT)
7079       MovDir[x][y] = (can_turn_left || !can_turn_right ? left_dir : right_dir);
7080     else if (move_pattern == MV_TURNING_RIGHT_LEFT)
7081       MovDir[x][y] = (can_turn_right || !can_turn_left ? right_dir : left_dir);
7082     else if (move_pattern == MV_TURNING_RANDOM)
7083       MovDir[x][y] = (can_turn_left && !can_turn_right ? left_dir :
7084                       can_turn_right && !can_turn_left ? right_dir :
7085                       RND(2) ? left_dir : right_dir);
7086     else if (can_turn_left && can_turn_right)
7087       MovDir[x][y] = (RND(3) ? (RND(2) ? left_dir : right_dir) : back_dir);
7088     else if (can_turn_left)
7089       MovDir[x][y] = (RND(2) ? left_dir : back_dir);
7090     else if (can_turn_right)
7091       MovDir[x][y] = (RND(2) ? right_dir : back_dir);
7092     else
7093       MovDir[x][y] = back_dir;
7094
7095     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7096   }
7097   else if (move_pattern == MV_HORIZONTAL ||
7098            move_pattern == MV_VERTICAL)
7099   {
7100     if (move_pattern & old_move_dir)
7101       MovDir[x][y] = back_dir;
7102     else if (move_pattern == MV_HORIZONTAL)
7103       MovDir[x][y] = (RND(2) ? MV_LEFT : MV_RIGHT);
7104     else if (move_pattern == MV_VERTICAL)
7105       MovDir[x][y] = (RND(2) ? MV_UP : MV_DOWN);
7106
7107     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7108   }
7109   else if (move_pattern & MV_ANY_DIRECTION)
7110   {
7111     MovDir[x][y] = move_pattern;
7112     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7113   }
7114   else if (move_pattern & MV_WIND_DIRECTION)
7115   {
7116     MovDir[x][y] = game.wind_direction;
7117     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7118   }
7119   else if (move_pattern == MV_ALONG_LEFT_SIDE)
7120   {
7121     if (CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, left_x, left_y))
7122       MovDir[x][y] = left_dir;
7123     else if (!CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, move_x, move_y))
7124       MovDir[x][y] = right_dir;
7125
7126     if (MovDir[x][y] != old_move_dir)
7127       MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7128   }
7129   else if (move_pattern == MV_ALONG_RIGHT_SIDE)
7130   {
7131     if (CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, right_x, right_y))
7132       MovDir[x][y] = right_dir;
7133     else if (!CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, move_x, move_y))
7134       MovDir[x][y] = left_dir;
7135
7136     if (MovDir[x][y] != old_move_dir)
7137       MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7138   }
7139   else if (move_pattern == MV_TOWARDS_PLAYER ||
7140            move_pattern == MV_AWAY_FROM_PLAYER)
7141   {
7142     int attr_x = -1, attr_y = -1;
7143     int newx, newy;
7144     boolean move_away = (move_pattern == MV_AWAY_FROM_PLAYER);
7145
7146     if (AllPlayersGone)
7147     {
7148       attr_x = ExitX;
7149       attr_y = ExitY;
7150     }
7151     else
7152     {
7153       int i;
7154
7155       for (i = 0; i < MAX_PLAYERS; i++)
7156       {
7157         struct PlayerInfo *player = &stored_player[i];
7158         int jx = player->jx, jy = player->jy;
7159
7160         if (!player->active)
7161           continue;
7162
7163         if (attr_x == -1 ||
7164             ABS(jx - x) + ABS(jy - y) < ABS(attr_x - x) + ABS(attr_y - y))
7165         {
7166           attr_x = jx;
7167           attr_y = jy;
7168         }
7169       }
7170     }
7171
7172     MovDir[x][y] = MV_NONE;
7173     if (attr_x < x)
7174       MovDir[x][y] |= (move_away ? MV_RIGHT : MV_LEFT);
7175     else if (attr_x > x)
7176       MovDir[x][y] |= (move_away ? MV_LEFT : MV_RIGHT);
7177     if (attr_y < y)
7178       MovDir[x][y] |= (move_away ? MV_DOWN : MV_UP);
7179     else if (attr_y > y)
7180       MovDir[x][y] |= (move_away ? MV_UP : MV_DOWN);
7181
7182     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7183
7184     if (MovDir[x][y] & MV_HORIZONTAL && MovDir[x][y] & MV_VERTICAL)
7185     {
7186       boolean first_horiz = RND(2);
7187       int new_move_dir = MovDir[x][y];
7188
7189       if (element_info[element].move_stepsize == 0)     /* "not moving" */
7190       {
7191         first_horiz = (ABS(attr_x - x) >= ABS(attr_y - y));
7192         MovDir[x][y] &= (first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
7193
7194         return;
7195       }
7196
7197       MovDir[x][y] =
7198         new_move_dir & (first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
7199       Moving2Blocked(x, y, &newx, &newy);
7200
7201       if (CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, newx, newy))
7202         return;
7203
7204       MovDir[x][y] =
7205         new_move_dir & (!first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
7206       Moving2Blocked(x, y, &newx, &newy);
7207
7208       if (CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, newx, newy))
7209         return;
7210
7211       MovDir[x][y] = old_move_dir;
7212     }
7213   }
7214   else if (move_pattern == MV_WHEN_PUSHED ||
7215            move_pattern == MV_WHEN_DROPPED)
7216   {
7217     if (!CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, move_x, move_y))
7218       MovDir[x][y] = MV_NONE;
7219
7220     MovDelay[x][y] = 0;
7221   }
7222   else if (move_pattern & MV_MAZE_RUNNER_STYLE)
7223   {
7224     static int test_xy[7][2] =
7225     {
7226       { 0, -1 },
7227       { -1, 0 },
7228       { +1, 0 },
7229       { 0, +1 },
7230       { 0, -1 },
7231       { -1, 0 },
7232       { +1, 0 },
7233     };
7234     static int test_dir[7] =
7235     {
7236       MV_UP,
7237       MV_LEFT,
7238       MV_RIGHT,
7239       MV_DOWN,
7240       MV_UP,
7241       MV_LEFT,
7242       MV_RIGHT,
7243     };
7244     boolean hunter_mode = (move_pattern == MV_MAZE_HUNTER);
7245     int move_preference = -1000000;     /* start with very low preference */
7246     int new_move_dir = MV_NONE;
7247     int start_test = RND(4);
7248     int i;
7249
7250     for (i = 0; i < NUM_DIRECTIONS; i++)
7251     {
7252       int move_dir = test_dir[start_test + i];
7253       int move_dir_preference;
7254
7255       xx = x + test_xy[start_test + i][0];
7256       yy = y + test_xy[start_test + i][1];
7257
7258       if (hunter_mode && IN_LEV_FIELD(xx, yy) &&
7259           (IS_PLAYER(xx, yy) || Feld[xx][yy] == EL_PLAYER_IS_LEAVING))
7260       {
7261         new_move_dir = move_dir;
7262
7263         break;
7264       }
7265
7266       if (!CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, xx, yy))
7267         continue;
7268
7269       move_dir_preference = -1 * RunnerVisit[xx][yy];
7270       if (hunter_mode && PlayerVisit[xx][yy] > 0)
7271         move_dir_preference = PlayerVisit[xx][yy];
7272
7273       if (move_dir_preference > move_preference)
7274       {
7275         /* prefer field that has not been visited for the longest time */
7276         move_preference = move_dir_preference;
7277         new_move_dir = move_dir;
7278       }
7279       else if (move_dir_preference == move_preference &&
7280                move_dir == old_move_dir)
7281       {
7282         /* prefer last direction when all directions are preferred equally */
7283         move_preference = move_dir_preference;
7284         new_move_dir = move_dir;
7285       }
7286     }
7287
7288     MovDir[x][y] = new_move_dir;
7289     if (old_move_dir != new_move_dir)
7290       MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7291   }
7292 }
7293
7294 static void TurnRound(int x, int y)
7295 {
7296   int direction = MovDir[x][y];
7297
7298   TurnRoundExt(x, y);
7299
7300   GfxDir[x][y] = MovDir[x][y];
7301
7302   if (direction != MovDir[x][y])
7303     GfxFrame[x][y] = 0;
7304
7305   if (MovDelay[x][y])
7306     GfxAction[x][y] = ACTION_TURNING_FROM_LEFT + MV_DIR_TO_BIT(direction);
7307
7308   ResetGfxFrame(x, y);
7309 }
7310
7311 static boolean JustBeingPushed(int x, int y)
7312 {
7313   int i;
7314
7315   for (i = 0; i < MAX_PLAYERS; i++)
7316   {
7317     struct PlayerInfo *player = &stored_player[i];
7318
7319     if (player->active && player->is_pushing && player->MovPos)
7320     {
7321       int next_jx = player->jx + (player->jx - player->last_jx);
7322       int next_jy = player->jy + (player->jy - player->last_jy);
7323
7324       if (x == next_jx && y == next_jy)
7325         return TRUE;
7326     }
7327   }
7328
7329   return FALSE;
7330 }
7331
7332 void StartMoving(int x, int y)
7333 {
7334   boolean started_moving = FALSE;       /* some elements can fall _and_ move */
7335   int element = Feld[x][y];
7336
7337   if (Stop[x][y])
7338     return;
7339
7340   if (MovDelay[x][y] == 0)
7341     GfxAction[x][y] = ACTION_DEFAULT;
7342
7343   if (CAN_FALL(element) && y < lev_fieldy - 1)
7344   {
7345     if ((x > 0              && IS_PLAYER(x - 1, y)) ||
7346         (x < lev_fieldx - 1 && IS_PLAYER(x + 1, y)))
7347       if (JustBeingPushed(x, y))
7348         return;
7349
7350     if (element == EL_QUICKSAND_FULL)
7351     {
7352       if (IS_FREE(x, y + 1))
7353       {
7354         InitMovingField(x, y, MV_DOWN);
7355         started_moving = TRUE;
7356
7357         Feld[x][y] = EL_QUICKSAND_EMPTYING;
7358 #if USE_QUICKSAND_BD_ROCK_BUGFIX
7359         if (Store[x][y] != EL_ROCK && Store[x][y] != EL_BD_ROCK)
7360           Store[x][y] = EL_ROCK;
7361 #else
7362         Store[x][y] = EL_ROCK;
7363 #endif
7364
7365         PlayLevelSoundAction(x, y, ACTION_EMPTYING);
7366       }
7367       else if (Feld[x][y + 1] == EL_QUICKSAND_EMPTY)
7368       {
7369         if (!MovDelay[x][y])
7370         {
7371           MovDelay[x][y] = TILEY + 1;
7372
7373           ResetGfxAnimation(x, y);
7374           ResetGfxAnimation(x, y + 1);
7375         }
7376
7377         if (MovDelay[x][y])
7378         {
7379           DrawLevelElement(x, y, EL_QUICKSAND_EMPTYING);
7380           DrawLevelElement(x, y + 1, EL_QUICKSAND_FILLING);
7381
7382           MovDelay[x][y]--;
7383           if (MovDelay[x][y])
7384             return;
7385         }
7386
7387         Feld[x][y] = EL_QUICKSAND_EMPTY;
7388         Feld[x][y + 1] = EL_QUICKSAND_FULL;
7389         Store[x][y + 1] = Store[x][y];
7390         Store[x][y] = 0;
7391
7392         PlayLevelSoundAction(x, y, ACTION_FILLING);
7393       }
7394       else if (Feld[x][y + 1] == EL_QUICKSAND_FAST_EMPTY)
7395       {
7396         if (!MovDelay[x][y])
7397         {
7398           MovDelay[x][y] = TILEY + 1;
7399
7400           ResetGfxAnimation(x, y);
7401           ResetGfxAnimation(x, y + 1);
7402         }
7403
7404         if (MovDelay[x][y])
7405         {
7406           DrawLevelElement(x, y, EL_QUICKSAND_EMPTYING);
7407           DrawLevelElement(x, y + 1, EL_QUICKSAND_FAST_FILLING);
7408
7409           MovDelay[x][y]--;
7410           if (MovDelay[x][y])
7411             return;
7412         }
7413
7414         Feld[x][y] = EL_QUICKSAND_EMPTY;
7415         Feld[x][y + 1] = EL_QUICKSAND_FAST_FULL;
7416         Store[x][y + 1] = Store[x][y];
7417         Store[x][y] = 0;
7418
7419         PlayLevelSoundAction(x, y, ACTION_FILLING);
7420       }
7421     }
7422     else if (element == EL_QUICKSAND_FAST_FULL)
7423     {
7424       if (IS_FREE(x, y + 1))
7425       {
7426         InitMovingField(x, y, MV_DOWN);
7427         started_moving = TRUE;
7428
7429         Feld[x][y] = EL_QUICKSAND_FAST_EMPTYING;
7430 #if USE_QUICKSAND_BD_ROCK_BUGFIX
7431         if (Store[x][y] != EL_ROCK && Store[x][y] != EL_BD_ROCK)
7432           Store[x][y] = EL_ROCK;
7433 #else
7434         Store[x][y] = EL_ROCK;
7435 #endif
7436
7437         PlayLevelSoundAction(x, y, ACTION_EMPTYING);
7438       }
7439       else if (Feld[x][y + 1] == EL_QUICKSAND_FAST_EMPTY)
7440       {
7441         if (!MovDelay[x][y])
7442         {
7443           MovDelay[x][y] = TILEY + 1;
7444
7445           ResetGfxAnimation(x, y);
7446           ResetGfxAnimation(x, y + 1);
7447         }
7448
7449         if (MovDelay[x][y])
7450         {
7451           DrawLevelElement(x, y, EL_QUICKSAND_FAST_EMPTYING);
7452           DrawLevelElement(x, y + 1, EL_QUICKSAND_FAST_FILLING);
7453
7454           MovDelay[x][y]--;
7455           if (MovDelay[x][y])
7456             return;
7457         }
7458
7459         Feld[x][y] = EL_QUICKSAND_FAST_EMPTY;
7460         Feld[x][y + 1] = EL_QUICKSAND_FAST_FULL;
7461         Store[x][y + 1] = Store[x][y];
7462         Store[x][y] = 0;
7463
7464         PlayLevelSoundAction(x, y, ACTION_FILLING);
7465       }
7466       else if (Feld[x][y + 1] == EL_QUICKSAND_EMPTY)
7467       {
7468         if (!MovDelay[x][y])
7469         {
7470           MovDelay[x][y] = TILEY + 1;
7471
7472           ResetGfxAnimation(x, y);
7473           ResetGfxAnimation(x, y + 1);
7474         }
7475
7476         if (MovDelay[x][y])
7477         {
7478           DrawLevelElement(x, y, EL_QUICKSAND_FAST_EMPTYING);
7479           DrawLevelElement(x, y + 1, EL_QUICKSAND_FILLING);
7480
7481           MovDelay[x][y]--;
7482           if (MovDelay[x][y])
7483             return;
7484         }
7485
7486         Feld[x][y] = EL_QUICKSAND_FAST_EMPTY;
7487         Feld[x][y + 1] = EL_QUICKSAND_FULL;
7488         Store[x][y + 1] = Store[x][y];
7489         Store[x][y] = 0;
7490
7491         PlayLevelSoundAction(x, y, ACTION_FILLING);
7492       }
7493     }
7494     else if ((element == EL_ROCK || element == EL_BD_ROCK) &&
7495              Feld[x][y + 1] == EL_QUICKSAND_EMPTY)
7496     {
7497       InitMovingField(x, y, MV_DOWN);
7498       started_moving = TRUE;
7499
7500       Feld[x][y] = EL_QUICKSAND_FILLING;
7501       Store[x][y] = element;
7502
7503       PlayLevelSoundAction(x, y, ACTION_FILLING);
7504     }
7505     else if ((element == EL_ROCK || element == EL_BD_ROCK) &&
7506              Feld[x][y + 1] == EL_QUICKSAND_FAST_EMPTY)
7507     {
7508       InitMovingField(x, y, MV_DOWN);
7509       started_moving = TRUE;
7510
7511       Feld[x][y] = EL_QUICKSAND_FAST_FILLING;
7512       Store[x][y] = element;
7513
7514       PlayLevelSoundAction(x, y, ACTION_FILLING);
7515     }
7516     else if (element == EL_MAGIC_WALL_FULL)
7517     {
7518       if (IS_FREE(x, y + 1))
7519       {
7520         InitMovingField(x, y, MV_DOWN);
7521         started_moving = TRUE;
7522
7523         Feld[x][y] = EL_MAGIC_WALL_EMPTYING;
7524         Store[x][y] = EL_CHANGED(Store[x][y]);
7525       }
7526       else if (Feld[x][y + 1] == EL_MAGIC_WALL_ACTIVE)
7527       {
7528         if (!MovDelay[x][y])
7529           MovDelay[x][y] = TILEY / 4 + 1;
7530
7531         if (MovDelay[x][y])
7532         {
7533           MovDelay[x][y]--;
7534           if (MovDelay[x][y])
7535             return;
7536         }
7537
7538         Feld[x][y] = EL_MAGIC_WALL_ACTIVE;
7539         Feld[x][y + 1] = EL_MAGIC_WALL_FULL;
7540         Store[x][y + 1] = EL_CHANGED(Store[x][y]);
7541         Store[x][y] = 0;
7542       }
7543     }
7544     else if (element == EL_BD_MAGIC_WALL_FULL)
7545     {
7546       if (IS_FREE(x, y + 1))
7547       {
7548         InitMovingField(x, y, MV_DOWN);
7549         started_moving = TRUE;
7550
7551         Feld[x][y] = EL_BD_MAGIC_WALL_EMPTYING;
7552         Store[x][y] = EL_CHANGED_BD(Store[x][y]);
7553       }
7554       else if (Feld[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE)
7555       {
7556         if (!MovDelay[x][y])
7557           MovDelay[x][y] = TILEY / 4 + 1;
7558
7559         if (MovDelay[x][y])
7560         {
7561           MovDelay[x][y]--;
7562           if (MovDelay[x][y])
7563             return;
7564         }
7565
7566         Feld[x][y] = EL_BD_MAGIC_WALL_ACTIVE;
7567         Feld[x][y + 1] = EL_BD_MAGIC_WALL_FULL;
7568         Store[x][y + 1] = EL_CHANGED_BD(Store[x][y]);
7569         Store[x][y] = 0;
7570       }
7571     }
7572     else if (element == EL_DC_MAGIC_WALL_FULL)
7573     {
7574       if (IS_FREE(x, y + 1))
7575       {
7576         InitMovingField(x, y, MV_DOWN);
7577         started_moving = TRUE;
7578
7579         Feld[x][y] = EL_DC_MAGIC_WALL_EMPTYING;
7580         Store[x][y] = EL_CHANGED_DC(Store[x][y]);
7581       }
7582       else if (Feld[x][y + 1] == EL_DC_MAGIC_WALL_ACTIVE)
7583       {
7584         if (!MovDelay[x][y])
7585           MovDelay[x][y] = TILEY / 4 + 1;
7586
7587         if (MovDelay[x][y])
7588         {
7589           MovDelay[x][y]--;
7590           if (MovDelay[x][y])
7591             return;
7592         }
7593
7594         Feld[x][y] = EL_DC_MAGIC_WALL_ACTIVE;
7595         Feld[x][y + 1] = EL_DC_MAGIC_WALL_FULL;
7596         Store[x][y + 1] = EL_CHANGED_DC(Store[x][y]);
7597         Store[x][y] = 0;
7598       }
7599     }
7600     else if ((CAN_PASS_MAGIC_WALL(element) &&
7601               (Feld[x][y + 1] == EL_MAGIC_WALL_ACTIVE ||
7602                Feld[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE)) ||
7603              (CAN_PASS_DC_MAGIC_WALL(element) &&
7604               (Feld[x][y + 1] == EL_DC_MAGIC_WALL_ACTIVE)))
7605
7606     {
7607       InitMovingField(x, y, MV_DOWN);
7608       started_moving = TRUE;
7609
7610       Feld[x][y] =
7611         (Feld[x][y + 1] == EL_MAGIC_WALL_ACTIVE ? EL_MAGIC_WALL_FILLING :
7612          Feld[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE ? EL_BD_MAGIC_WALL_FILLING :
7613          EL_DC_MAGIC_WALL_FILLING);
7614       Store[x][y] = element;
7615     }
7616     else if (CAN_FALL(element) && Feld[x][y + 1] == EL_ACID)
7617     {
7618       SplashAcid(x, y + 1);
7619
7620       InitMovingField(x, y, MV_DOWN);
7621       started_moving = TRUE;
7622
7623       Store[x][y] = EL_ACID;
7624     }
7625     else if (
7626              (game.engine_version >= VERSION_IDENT(3,1,0,0) &&
7627               CheckImpact[x][y] && !IS_FREE(x, y + 1)) ||
7628              (game.engine_version >= VERSION_IDENT(3,0,7,0) &&
7629               CAN_FALL(element) && WasJustFalling[x][y] &&
7630               (Feld[x][y + 1] == EL_BLOCKED || IS_PLAYER(x, y + 1))) ||
7631
7632              (game.engine_version < VERSION_IDENT(2,2,0,7) &&
7633               CAN_FALL(element) && WasJustMoving[x][y] && !Pushed[x][y + 1] &&
7634               (Feld[x][y + 1] == EL_BLOCKED)))
7635     {
7636       /* this is needed for a special case not covered by calling "Impact()"
7637          from "ContinueMoving()": if an element moves to a tile directly below
7638          another element which was just falling on that tile (which was empty
7639          in the previous frame), the falling element above would just stop
7640          instead of smashing the element below (in previous version, the above
7641          element was just checked for "moving" instead of "falling", resulting
7642          in incorrect smashes caused by horizontal movement of the above
7643          element; also, the case of the player being the element to smash was
7644          simply not covered here... :-/ ) */
7645
7646       CheckCollision[x][y] = 0;
7647       CheckImpact[x][y] = 0;
7648
7649       Impact(x, y);
7650     }
7651     else if (IS_FREE(x, y + 1) && element == EL_SPRING && level.use_spring_bug)
7652     {
7653       if (MovDir[x][y] == MV_NONE)
7654       {
7655         InitMovingField(x, y, MV_DOWN);
7656         started_moving = TRUE;
7657       }
7658     }
7659     else if (IS_FREE(x, y + 1) || Feld[x][y + 1] == EL_DIAMOND_BREAKING)
7660     {
7661       if (WasJustFalling[x][y]) /* prevent animation from being restarted */
7662         MovDir[x][y] = MV_DOWN;
7663
7664       InitMovingField(x, y, MV_DOWN);
7665       started_moving = TRUE;
7666     }
7667     else if (element == EL_AMOEBA_DROP)
7668     {
7669       Feld[x][y] = EL_AMOEBA_GROWING;
7670       Store[x][y] = EL_AMOEBA_WET;
7671     }
7672     else if (((IS_SLIPPERY(Feld[x][y + 1]) && !IS_PLAYER(x, y + 1)) ||
7673               (IS_EM_SLIPPERY_WALL(Feld[x][y + 1]) && IS_GEM(element))) &&
7674              !IS_FALLING(x, y + 1) && !WasJustMoving[x][y + 1] &&
7675              element != EL_DX_SUPABOMB && element != EL_SP_DISK_ORANGE)
7676     {
7677       boolean can_fall_left  = (x > 0 && IS_FREE(x - 1, y) &&
7678                                 (IS_FREE(x - 1, y + 1) ||
7679                                  Feld[x - 1][y + 1] == EL_ACID));
7680       boolean can_fall_right = (x < lev_fieldx - 1 && IS_FREE(x + 1, y) &&
7681                                 (IS_FREE(x + 1, y + 1) ||
7682                                  Feld[x + 1][y + 1] == EL_ACID));
7683       boolean can_fall_any  = (can_fall_left || can_fall_right);
7684       boolean can_fall_both = (can_fall_left && can_fall_right);
7685       int slippery_type = element_info[Feld[x][y + 1]].slippery_type;
7686
7687       if (can_fall_any && slippery_type != SLIPPERY_ANY_RANDOM)
7688       {
7689         if (slippery_type == SLIPPERY_ANY_LEFT_RIGHT && can_fall_both)
7690           can_fall_right = FALSE;
7691         else if (slippery_type == SLIPPERY_ANY_RIGHT_LEFT && can_fall_both)
7692           can_fall_left = FALSE;
7693         else if (slippery_type == SLIPPERY_ONLY_LEFT)
7694           can_fall_right = FALSE;
7695         else if (slippery_type == SLIPPERY_ONLY_RIGHT)
7696           can_fall_left = FALSE;
7697
7698         can_fall_any  = (can_fall_left || can_fall_right);
7699         can_fall_both = FALSE;
7700       }
7701
7702       if (can_fall_both)
7703       {
7704         if (element == EL_BD_ROCK || element == EL_BD_DIAMOND)
7705           can_fall_right = FALSE;       /* slip down on left side */
7706         else
7707           can_fall_left = !(can_fall_right = RND(2));
7708
7709         can_fall_both = FALSE;
7710       }
7711
7712       if (can_fall_any)
7713       {
7714         /* if not determined otherwise, prefer left side for slipping down */
7715         InitMovingField(x, y, can_fall_left ? MV_LEFT : MV_RIGHT);
7716         started_moving = TRUE;
7717       }
7718     }
7719     else if (IS_BELT_ACTIVE(Feld[x][y + 1]))
7720     {
7721       boolean left_is_free  = (x > 0 && IS_FREE(x - 1, y));
7722       boolean right_is_free = (x < lev_fieldx - 1 && IS_FREE(x + 1, y));
7723       int belt_nr = getBeltNrFromBeltActiveElement(Feld[x][y + 1]);
7724       int belt_dir = game.belt_dir[belt_nr];
7725
7726       if ((belt_dir == MV_LEFT  && left_is_free) ||
7727           (belt_dir == MV_RIGHT && right_is_free))
7728       {
7729         int nextx = (belt_dir == MV_LEFT ? x - 1 : x + 1);
7730
7731         InitMovingField(x, y, belt_dir);
7732         started_moving = TRUE;
7733
7734         Pushed[x][y] = TRUE;
7735         Pushed[nextx][y] = TRUE;
7736
7737         GfxAction[x][y] = ACTION_DEFAULT;
7738       }
7739       else
7740       {
7741         MovDir[x][y] = 0;       /* if element was moving, stop it */
7742       }
7743     }
7744   }
7745
7746   /* not "else if" because of elements that can fall and move (EL_SPRING) */
7747   if (CAN_MOVE(element) && !started_moving)
7748   {
7749     int move_pattern = element_info[element].move_pattern;
7750     int newx, newy;
7751
7752     Moving2Blocked(x, y, &newx, &newy);
7753
7754     if (IS_PUSHABLE(element) && JustBeingPushed(x, y))
7755       return;
7756
7757     if (game.engine_version >= VERSION_IDENT(3,1,0,0) &&
7758         CheckCollision[x][y] && !IN_LEV_FIELD_AND_IS_FREE(newx, newy))
7759     {
7760       WasJustMoving[x][y] = 0;
7761       CheckCollision[x][y] = 0;
7762
7763       TestIfElementHitsCustomElement(x, y, MovDir[x][y]);
7764
7765       if (Feld[x][y] != element)        /* element has changed */
7766         return;
7767     }
7768
7769     if (!MovDelay[x][y])        /* start new movement phase */
7770     {
7771       /* all objects that can change their move direction after each step
7772          (YAMYAM, DARK_YAMYAM and PACMAN go straight until they hit a wall */
7773
7774       if (element != EL_YAMYAM &&
7775           element != EL_DARK_YAMYAM &&
7776           element != EL_PACMAN &&
7777           !(move_pattern & MV_ANY_DIRECTION) &&
7778           move_pattern != MV_TURNING_LEFT &&
7779           move_pattern != MV_TURNING_RIGHT &&
7780           move_pattern != MV_TURNING_LEFT_RIGHT &&
7781           move_pattern != MV_TURNING_RIGHT_LEFT &&
7782           move_pattern != MV_TURNING_RANDOM)
7783       {
7784         TurnRound(x, y);
7785
7786         if (MovDelay[x][y] && (element == EL_BUG ||
7787                                element == EL_SPACESHIP ||
7788                                element == EL_SP_SNIKSNAK ||
7789                                element == EL_SP_ELECTRON ||
7790                                element == EL_MOLE))
7791           TEST_DrawLevelField(x, y);
7792       }
7793     }
7794
7795     if (MovDelay[x][y])         /* wait some time before next movement */
7796     {
7797       MovDelay[x][y]--;
7798
7799       if (element == EL_ROBOT ||
7800           element == EL_YAMYAM ||
7801           element == EL_DARK_YAMYAM)
7802       {
7803         DrawLevelElementAnimationIfNeeded(x, y, element);
7804         PlayLevelSoundAction(x, y, ACTION_WAITING);
7805       }
7806       else if (element == EL_SP_ELECTRON)
7807         DrawLevelElementAnimationIfNeeded(x, y, element);
7808       else if (element == EL_DRAGON)
7809       {
7810         int i;
7811         int dir = MovDir[x][y];
7812         int dx = (dir == MV_LEFT ? -1 : dir == MV_RIGHT ? +1 : 0);
7813         int dy = (dir == MV_UP   ? -1 : dir == MV_DOWN  ? +1 : 0);
7814         int graphic = (dir == MV_LEFT   ? IMG_FLAMES_1_LEFT :
7815                        dir == MV_RIGHT  ? IMG_FLAMES_1_RIGHT :
7816                        dir == MV_UP     ? IMG_FLAMES_1_UP :
7817                        dir == MV_DOWN   ? IMG_FLAMES_1_DOWN : IMG_EMPTY);
7818         int frame = getGraphicAnimationFrame(graphic, GfxFrame[x][y]);
7819
7820         GfxAction[x][y] = ACTION_ATTACKING;
7821
7822         if (IS_PLAYER(x, y))
7823           DrawPlayerField(x, y);
7824         else
7825           TEST_DrawLevelField(x, y);
7826
7827         PlayLevelSoundActionIfLoop(x, y, ACTION_ATTACKING);
7828
7829         for (i = 1; i <= 3; i++)
7830         {
7831           int xx = x + i * dx;
7832           int yy = y + i * dy;
7833           int sx = SCREENX(xx);
7834           int sy = SCREENY(yy);
7835           int flame_graphic = graphic + (i - 1);
7836
7837           if (!IN_LEV_FIELD(xx, yy) || IS_DRAGONFIRE_PROOF(Feld[xx][yy]))
7838             break;
7839
7840           if (MovDelay[x][y])
7841           {
7842             int flamed = MovingOrBlocked2Element(xx, yy);
7843
7844             if (IS_CLASSIC_ENEMY(flamed) || CAN_EXPLODE_BY_DRAGONFIRE(flamed))
7845               Bang(xx, yy);
7846             else
7847               RemoveMovingField(xx, yy);
7848
7849             ChangeDelay[xx][yy] = 0;
7850
7851             Feld[xx][yy] = EL_FLAMES;
7852
7853             if (IN_SCR_FIELD(sx, sy))
7854             {
7855               TEST_DrawLevelFieldCrumbled(xx, yy);
7856               DrawGraphic(sx, sy, flame_graphic, frame);
7857             }
7858           }
7859           else
7860           {
7861             if (Feld[xx][yy] == EL_FLAMES)
7862               Feld[xx][yy] = EL_EMPTY;
7863             TEST_DrawLevelField(xx, yy);
7864           }
7865         }
7866       }
7867
7868       if (MovDelay[x][y])       /* element still has to wait some time */
7869       {
7870         PlayLevelSoundAction(x, y, ACTION_WAITING);
7871
7872         return;
7873       }
7874     }
7875
7876     /* now make next step */
7877
7878     Moving2Blocked(x, y, &newx, &newy); /* get next screen position */
7879
7880     if (DONT_COLLIDE_WITH(element) &&
7881         IN_LEV_FIELD(newx, newy) && IS_PLAYER(newx, newy) &&
7882         !PLAYER_ENEMY_PROTECTED(newx, newy))
7883     {
7884       TestIfBadThingRunsIntoPlayer(x, y, MovDir[x][y]);
7885
7886       return;
7887     }
7888
7889     else if (CAN_MOVE_INTO_ACID(element) &&
7890              IN_LEV_FIELD(newx, newy) && Feld[newx][newy] == EL_ACID &&
7891              !IS_MV_DIAGONAL(MovDir[x][y]) &&
7892              (MovDir[x][y] == MV_DOWN ||
7893               game.engine_version >= VERSION_IDENT(3,1,0,0)))
7894     {
7895       SplashAcid(newx, newy);
7896       Store[x][y] = EL_ACID;
7897     }
7898     else if (element == EL_PENGUIN && IN_LEV_FIELD(newx, newy))
7899     {
7900       if (Feld[newx][newy] == EL_EXIT_OPEN ||
7901           Feld[newx][newy] == EL_EM_EXIT_OPEN ||
7902           Feld[newx][newy] == EL_STEEL_EXIT_OPEN ||
7903           Feld[newx][newy] == EL_EM_STEEL_EXIT_OPEN)
7904       {
7905         RemoveField(x, y);
7906         TEST_DrawLevelField(x, y);
7907
7908         PlayLevelSound(newx, newy, SND_PENGUIN_PASSING);
7909         if (IN_SCR_FIELD(SCREENX(newx), SCREENY(newy)))
7910           DrawGraphicThruMask(SCREENX(newx),SCREENY(newy), el2img(element), 0);
7911
7912         local_player->friends_still_needed--;
7913         if (!local_player->friends_still_needed &&
7914             !local_player->GameOver && AllPlayersGone)
7915           PlayerWins(local_player);
7916
7917         return;
7918       }
7919       else if (IS_FOOD_PENGUIN(Feld[newx][newy]))
7920       {
7921         if (DigField(local_player, x, y, newx, newy, 0,0, DF_DIG) == MP_MOVING)
7922           TEST_DrawLevelField(newx, newy);
7923         else
7924           GfxDir[x][y] = MovDir[x][y] = MV_NONE;
7925       }
7926       else if (!IS_FREE(newx, newy))
7927       {
7928         GfxAction[x][y] = ACTION_WAITING;
7929
7930         if (IS_PLAYER(x, y))
7931           DrawPlayerField(x, y);
7932         else
7933           TEST_DrawLevelField(x, y);
7934
7935         return;
7936       }
7937     }
7938     else if (element == EL_PIG && IN_LEV_FIELD(newx, newy))
7939     {
7940       if (IS_FOOD_PIG(Feld[newx][newy]))
7941       {
7942         if (IS_MOVING(newx, newy))
7943           RemoveMovingField(newx, newy);
7944         else
7945         {
7946           Feld[newx][newy] = EL_EMPTY;
7947           TEST_DrawLevelField(newx, newy);
7948         }
7949
7950         PlayLevelSound(x, y, SND_PIG_DIGGING);
7951       }
7952       else if (!IS_FREE(newx, newy))
7953       {
7954         if (IS_PLAYER(x, y))
7955           DrawPlayerField(x, y);
7956         else
7957           TEST_DrawLevelField(x, y);
7958
7959         return;
7960       }
7961     }
7962     else if (element == EL_EMC_ANDROID && IN_LEV_FIELD(newx, newy))
7963     {
7964       if (Store[x][y] != EL_EMPTY)
7965       {
7966         boolean can_clone = FALSE;
7967         int xx, yy;
7968
7969         /* check if element to clone is still there */
7970         for (yy = y - 1; yy <= y + 1; yy++) for (xx = x - 1; xx <= x + 1; xx++)
7971         {
7972           if (IN_LEV_FIELD(xx, yy) && Feld[xx][yy] == Store[x][y])
7973           {
7974             can_clone = TRUE;
7975
7976             break;
7977           }
7978         }
7979
7980         /* cannot clone or target field not free anymore -- do not clone */
7981         if (!can_clone || !ANDROID_CAN_ENTER_FIELD(element, newx, newy))
7982           Store[x][y] = EL_EMPTY;
7983       }
7984
7985       if (ANDROID_CAN_ENTER_FIELD(element, newx, newy))
7986       {
7987         if (IS_MV_DIAGONAL(MovDir[x][y]))
7988         {
7989           int diagonal_move_dir = MovDir[x][y];
7990           int stored = Store[x][y];
7991           int change_delay = 8;
7992           int graphic;
7993
7994           /* android is moving diagonally */
7995
7996           CreateField(x, y, EL_DIAGONAL_SHRINKING);
7997
7998           Store[x][y] = (stored == EL_ACID ? EL_EMPTY : stored);
7999           GfxElement[x][y] = EL_EMC_ANDROID;
8000           GfxAction[x][y] = ACTION_SHRINKING;
8001           GfxDir[x][y] = diagonal_move_dir;
8002           ChangeDelay[x][y] = change_delay;
8003
8004           graphic = el_act_dir2img(GfxElement[x][y], GfxAction[x][y],
8005                                    GfxDir[x][y]);
8006
8007           DrawLevelGraphicAnimation(x, y, graphic);
8008           PlayLevelSoundAction(x, y, ACTION_SHRINKING);
8009
8010           if (Feld[newx][newy] == EL_ACID)
8011           {
8012             SplashAcid(newx, newy);
8013
8014             return;
8015           }
8016
8017           CreateField(newx, newy, EL_DIAGONAL_GROWING);
8018
8019           Store[newx][newy] = EL_EMC_ANDROID;
8020           GfxElement[newx][newy] = EL_EMC_ANDROID;
8021           GfxAction[newx][newy] = ACTION_GROWING;
8022           GfxDir[newx][newy] = diagonal_move_dir;
8023           ChangeDelay[newx][newy] = change_delay;
8024
8025           graphic = el_act_dir2img(GfxElement[newx][newy],
8026                                    GfxAction[newx][newy], GfxDir[newx][newy]);
8027
8028           DrawLevelGraphicAnimation(newx, newy, graphic);
8029           PlayLevelSoundAction(newx, newy, ACTION_GROWING);
8030
8031           return;
8032         }
8033         else
8034         {
8035           Feld[newx][newy] = EL_EMPTY;
8036           TEST_DrawLevelField(newx, newy);
8037
8038           PlayLevelSoundAction(x, y, ACTION_DIGGING);
8039         }
8040       }
8041       else if (!IS_FREE(newx, newy))
8042       {
8043         return;
8044       }
8045     }
8046     else if (IS_CUSTOM_ELEMENT(element) &&
8047              CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, newx, newy))
8048     {
8049       if (!DigFieldByCE(newx, newy, element))
8050         return;
8051
8052       if (move_pattern & MV_MAZE_RUNNER_STYLE)
8053       {
8054         RunnerVisit[x][y] = FrameCounter;
8055         PlayerVisit[x][y] /= 8;         /* expire player visit path */
8056       }
8057     }
8058     else if (element == EL_DRAGON && IN_LEV_FIELD(newx, newy))
8059     {
8060       if (!IS_FREE(newx, newy))
8061       {
8062         if (IS_PLAYER(x, y))
8063           DrawPlayerField(x, y);
8064         else
8065           TEST_DrawLevelField(x, y);
8066
8067         return;
8068       }
8069       else
8070       {
8071         boolean wanna_flame = !RND(10);
8072         int dx = newx - x, dy = newy - y;
8073         int newx1 = newx + 1 * dx, newy1 = newy + 1 * dy;
8074         int newx2 = newx + 2 * dx, newy2 = newy + 2 * dy;
8075         int element1 = (IN_LEV_FIELD(newx1, newy1) ?
8076                         MovingOrBlocked2Element(newx1, newy1) : EL_STEELWALL);
8077         int element2 = (IN_LEV_FIELD(newx2, newy2) ?
8078                         MovingOrBlocked2Element(newx2, newy2) : EL_STEELWALL);
8079
8080         if ((wanna_flame ||
8081              IS_CLASSIC_ENEMY(element1) ||
8082              IS_CLASSIC_ENEMY(element2)) &&
8083             element1 != EL_DRAGON && element2 != EL_DRAGON &&
8084             element1 != EL_FLAMES && element2 != EL_FLAMES)
8085         {
8086           ResetGfxAnimation(x, y);
8087           GfxAction[x][y] = ACTION_ATTACKING;
8088
8089           if (IS_PLAYER(x, y))
8090             DrawPlayerField(x, y);
8091           else
8092             TEST_DrawLevelField(x, y);
8093
8094           PlayLevelSound(x, y, SND_DRAGON_ATTACKING);
8095
8096           MovDelay[x][y] = 50;
8097
8098           Feld[newx][newy] = EL_FLAMES;
8099           if (IN_LEV_FIELD(newx1, newy1) && Feld[newx1][newy1] == EL_EMPTY)
8100             Feld[newx1][newy1] = EL_FLAMES;
8101           if (IN_LEV_FIELD(newx2, newy2) && Feld[newx2][newy2] == EL_EMPTY)
8102             Feld[newx2][newy2] = EL_FLAMES;
8103
8104           return;
8105         }
8106       }
8107     }
8108     else if (element == EL_YAMYAM && IN_LEV_FIELD(newx, newy) &&
8109              Feld[newx][newy] == EL_DIAMOND)
8110     {
8111       if (IS_MOVING(newx, newy))
8112         RemoveMovingField(newx, newy);
8113       else
8114       {
8115         Feld[newx][newy] = EL_EMPTY;
8116         TEST_DrawLevelField(newx, newy);
8117       }
8118
8119       PlayLevelSound(x, y, SND_YAMYAM_DIGGING);
8120     }
8121     else if (element == EL_DARK_YAMYAM && IN_LEV_FIELD(newx, newy) &&
8122              IS_FOOD_DARK_YAMYAM(Feld[newx][newy]))
8123     {
8124       if (AmoebaNr[newx][newy])
8125       {
8126         AmoebaCnt2[AmoebaNr[newx][newy]]--;
8127         if (Feld[newx][newy] == EL_AMOEBA_FULL ||
8128             Feld[newx][newy] == EL_BD_AMOEBA)
8129           AmoebaCnt[AmoebaNr[newx][newy]]--;
8130       }
8131
8132       if (IS_MOVING(newx, newy))
8133       {
8134         RemoveMovingField(newx, newy);
8135       }
8136       else
8137       {
8138         Feld[newx][newy] = EL_EMPTY;
8139         TEST_DrawLevelField(newx, newy);
8140       }
8141
8142       PlayLevelSound(x, y, SND_DARK_YAMYAM_DIGGING);
8143     }
8144     else if ((element == EL_PACMAN || element == EL_MOLE)
8145              && IN_LEV_FIELD(newx, newy) && IS_AMOEBOID(Feld[newx][newy]))
8146     {
8147       if (AmoebaNr[newx][newy])
8148       {
8149         AmoebaCnt2[AmoebaNr[newx][newy]]--;
8150         if (Feld[newx][newy] == EL_AMOEBA_FULL ||
8151             Feld[newx][newy] == EL_BD_AMOEBA)
8152           AmoebaCnt[AmoebaNr[newx][newy]]--;
8153       }
8154
8155       if (element == EL_MOLE)
8156       {
8157         Feld[newx][newy] = EL_AMOEBA_SHRINKING;
8158         PlayLevelSound(x, y, SND_MOLE_DIGGING);
8159
8160         ResetGfxAnimation(x, y);
8161         GfxAction[x][y] = ACTION_DIGGING;
8162         TEST_DrawLevelField(x, y);
8163
8164         MovDelay[newx][newy] = 0;       /* start amoeba shrinking delay */
8165
8166         return;                         /* wait for shrinking amoeba */
8167       }
8168       else      /* element == EL_PACMAN */
8169       {
8170         Feld[newx][newy] = EL_EMPTY;
8171         TEST_DrawLevelField(newx, newy);
8172         PlayLevelSound(x, y, SND_PACMAN_DIGGING);
8173       }
8174     }
8175     else if (element == EL_MOLE && IN_LEV_FIELD(newx, newy) &&
8176              (Feld[newx][newy] == EL_AMOEBA_SHRINKING ||
8177               (Feld[newx][newy] == EL_EMPTY && Stop[newx][newy])))
8178     {
8179       /* wait for shrinking amoeba to completely disappear */
8180       return;
8181     }
8182     else if (!IN_LEV_FIELD(newx, newy) || !IS_FREE(newx, newy))
8183     {
8184       /* object was running against a wall */
8185
8186       TurnRound(x, y);
8187
8188       if (GFX_ELEMENT(element) != EL_SAND)     /* !!! FIX THIS (crumble) !!! */
8189         DrawLevelElementAnimation(x, y, element);
8190
8191       if (DONT_TOUCH(element))
8192         TestIfBadThingTouchesPlayer(x, y);
8193
8194       return;
8195     }
8196
8197     InitMovingField(x, y, MovDir[x][y]);
8198
8199     PlayLevelSoundAction(x, y, ACTION_MOVING);
8200   }
8201
8202   if (MovDir[x][y])
8203     ContinueMoving(x, y);
8204 }
8205
8206 void ContinueMoving(int x, int y)
8207 {
8208   int element = Feld[x][y];
8209   struct ElementInfo *ei = &element_info[element];
8210   int direction = MovDir[x][y];
8211   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
8212   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
8213   int newx = x + dx, newy = y + dy;
8214   int stored = Store[x][y];
8215   int stored_new = Store[newx][newy];
8216   boolean pushed_by_player   = (Pushed[x][y] && IS_PLAYER(x, y));
8217   boolean pushed_by_conveyor = (Pushed[x][y] && !IS_PLAYER(x, y));
8218   boolean last_line = (newy == lev_fieldy - 1);
8219
8220   MovPos[x][y] += getElementMoveStepsize(x, y);
8221
8222   if (pushed_by_player) /* special case: moving object pushed by player */
8223     MovPos[x][y] = SIGN(MovPos[x][y]) * (TILEX - ABS(PLAYERINFO(x,y)->MovPos));
8224
8225   if (ABS(MovPos[x][y]) < TILEX)
8226   {
8227     TEST_DrawLevelField(x, y);
8228
8229     return;     /* element is still moving */
8230   }
8231
8232   /* element reached destination field */
8233
8234   Feld[x][y] = EL_EMPTY;
8235   Feld[newx][newy] = element;
8236   MovPos[x][y] = 0;     /* force "not moving" for "crumbled sand" */
8237
8238   if (Store[x][y] == EL_ACID)   /* element is moving into acid pool */
8239   {
8240     element = Feld[newx][newy] = EL_ACID;
8241   }
8242   else if (element == EL_MOLE)
8243   {
8244     Feld[x][y] = EL_SAND;
8245
8246     TEST_DrawLevelFieldCrumbledNeighbours(x, y);
8247   }
8248   else if (element == EL_QUICKSAND_FILLING)
8249   {
8250     element = Feld[newx][newy] = get_next_element(element);
8251     Store[newx][newy] = Store[x][y];
8252   }
8253   else if (element == EL_QUICKSAND_EMPTYING)
8254   {
8255     Feld[x][y] = get_next_element(element);
8256     element = Feld[newx][newy] = Store[x][y];
8257   }
8258   else if (element == EL_QUICKSAND_FAST_FILLING)
8259   {
8260     element = Feld[newx][newy] = get_next_element(element);
8261     Store[newx][newy] = Store[x][y];
8262   }
8263   else if (element == EL_QUICKSAND_FAST_EMPTYING)
8264   {
8265     Feld[x][y] = get_next_element(element);
8266     element = Feld[newx][newy] = Store[x][y];
8267   }
8268   else if (element == EL_MAGIC_WALL_FILLING)
8269   {
8270     element = Feld[newx][newy] = get_next_element(element);
8271     if (!game.magic_wall_active)
8272       element = Feld[newx][newy] = EL_MAGIC_WALL_DEAD;
8273     Store[newx][newy] = Store[x][y];
8274   }
8275   else if (element == EL_MAGIC_WALL_EMPTYING)
8276   {
8277     Feld[x][y] = get_next_element(element);
8278     if (!game.magic_wall_active)
8279       Feld[x][y] = EL_MAGIC_WALL_DEAD;
8280     element = Feld[newx][newy] = Store[x][y];
8281
8282     InitField(newx, newy, FALSE);
8283   }
8284   else if (element == EL_BD_MAGIC_WALL_FILLING)
8285   {
8286     element = Feld[newx][newy] = get_next_element(element);
8287     if (!game.magic_wall_active)
8288       element = Feld[newx][newy] = EL_BD_MAGIC_WALL_DEAD;
8289     Store[newx][newy] = Store[x][y];
8290   }
8291   else if (element == EL_BD_MAGIC_WALL_EMPTYING)
8292   {
8293     Feld[x][y] = get_next_element(element);
8294     if (!game.magic_wall_active)
8295       Feld[x][y] = EL_BD_MAGIC_WALL_DEAD;
8296     element = Feld[newx][newy] = Store[x][y];
8297
8298     InitField(newx, newy, FALSE);
8299   }
8300   else if (element == EL_DC_MAGIC_WALL_FILLING)
8301   {
8302     element = Feld[newx][newy] = get_next_element(element);
8303     if (!game.magic_wall_active)
8304       element = Feld[newx][newy] = EL_DC_MAGIC_WALL_DEAD;
8305     Store[newx][newy] = Store[x][y];
8306   }
8307   else if (element == EL_DC_MAGIC_WALL_EMPTYING)
8308   {
8309     Feld[x][y] = get_next_element(element);
8310     if (!game.magic_wall_active)
8311       Feld[x][y] = EL_DC_MAGIC_WALL_DEAD;
8312     element = Feld[newx][newy] = Store[x][y];
8313
8314     InitField(newx, newy, FALSE);
8315   }
8316   else if (element == EL_AMOEBA_DROPPING)
8317   {
8318     Feld[x][y] = get_next_element(element);
8319     element = Feld[newx][newy] = Store[x][y];
8320   }
8321   else if (element == EL_SOKOBAN_OBJECT)
8322   {
8323     if (Back[x][y])
8324       Feld[x][y] = Back[x][y];
8325
8326     if (Back[newx][newy])
8327       Feld[newx][newy] = EL_SOKOBAN_FIELD_FULL;
8328
8329     Back[x][y] = Back[newx][newy] = 0;
8330   }
8331
8332   Store[x][y] = EL_EMPTY;
8333   MovPos[x][y] = 0;
8334   MovDir[x][y] = 0;
8335   MovDelay[x][y] = 0;
8336
8337   MovDelay[newx][newy] = 0;
8338
8339   if (CAN_CHANGE_OR_HAS_ACTION(element))
8340   {
8341     /* copy element change control values to new field */
8342     ChangeDelay[newx][newy] = ChangeDelay[x][y];
8343     ChangePage[newx][newy]  = ChangePage[x][y];
8344     ChangeCount[newx][newy] = ChangeCount[x][y];
8345     ChangeEvent[newx][newy] = ChangeEvent[x][y];
8346   }
8347
8348   CustomValue[newx][newy] = CustomValue[x][y];
8349
8350   ChangeDelay[x][y] = 0;
8351   ChangePage[x][y] = -1;
8352   ChangeCount[x][y] = 0;
8353   ChangeEvent[x][y] = -1;
8354
8355   CustomValue[x][y] = 0;
8356
8357   /* copy animation control values to new field */
8358   GfxFrame[newx][newy]  = GfxFrame[x][y];
8359   GfxRandom[newx][newy] = GfxRandom[x][y];      /* keep same random value */
8360   GfxAction[newx][newy] = GfxAction[x][y];      /* keep action one frame  */
8361   GfxDir[newx][newy]    = GfxDir[x][y];         /* keep element direction */
8362
8363   Pushed[x][y] = Pushed[newx][newy] = FALSE;
8364
8365   /* some elements can leave other elements behind after moving */
8366   if (ei->move_leave_element != EL_EMPTY &&
8367       (ei->move_leave_type == LEAVE_TYPE_UNLIMITED || stored != EL_EMPTY) &&
8368       (!IS_PLAYER(x, y) || IS_WALKABLE(ei->move_leave_element)))
8369   {
8370     int move_leave_element = ei->move_leave_element;
8371
8372     /* this makes it possible to leave the removed element again */
8373     if (ei->move_leave_element == EL_TRIGGER_ELEMENT)
8374       move_leave_element = (stored == EL_ACID ? EL_EMPTY : stored);
8375
8376     Feld[x][y] = move_leave_element;
8377
8378     if (element_info[Feld[x][y]].move_direction_initial == MV_START_PREVIOUS)
8379       MovDir[x][y] = direction;
8380
8381     InitField(x, y, FALSE);
8382
8383     if (GFX_CRUMBLED(Feld[x][y]))
8384       TEST_DrawLevelFieldCrumbledNeighbours(x, y);
8385
8386     if (ELEM_IS_PLAYER(move_leave_element))
8387       RelocatePlayer(x, y, move_leave_element);
8388   }
8389
8390   /* do this after checking for left-behind element */
8391   ResetGfxAnimation(x, y);      /* reset animation values for old field */
8392
8393   if (!CAN_MOVE(element) ||
8394       (CAN_FALL(element) && direction == MV_DOWN &&
8395        (element == EL_SPRING ||
8396         element_info[element].move_pattern == MV_WHEN_PUSHED ||
8397         element_info[element].move_pattern == MV_WHEN_DROPPED)))
8398     GfxDir[x][y] = MovDir[newx][newy] = 0;
8399
8400   TEST_DrawLevelField(x, y);
8401   TEST_DrawLevelField(newx, newy);
8402
8403   Stop[newx][newy] = TRUE;      /* ignore this element until the next frame */
8404
8405   /* prevent pushed element from moving on in pushed direction */
8406   if (pushed_by_player && CAN_MOVE(element) &&
8407       element_info[element].move_pattern & MV_ANY_DIRECTION &&
8408       !(element_info[element].move_pattern & direction))
8409     TurnRound(newx, newy);
8410
8411   /* prevent elements on conveyor belt from moving on in last direction */
8412   if (pushed_by_conveyor && CAN_FALL(element) &&
8413       direction & MV_HORIZONTAL)
8414     MovDir[newx][newy] = 0;
8415
8416   if (!pushed_by_player)
8417   {
8418     int nextx = newx + dx, nexty = newy + dy;
8419     boolean check_collision_again = IN_LEV_FIELD_AND_IS_FREE(nextx, nexty);
8420
8421     WasJustMoving[newx][newy] = CHECK_DELAY_MOVING;
8422
8423     if (CAN_FALL(element) && direction == MV_DOWN)
8424       WasJustFalling[newx][newy] = CHECK_DELAY_FALLING;
8425
8426     if ((!CAN_FALL(element) || direction == MV_DOWN) && check_collision_again)
8427       CheckCollision[newx][newy] = CHECK_DELAY_COLLISION;
8428
8429     if (CAN_FALL(element) && direction == MV_DOWN && check_collision_again)
8430       CheckImpact[newx][newy] = CHECK_DELAY_IMPACT;
8431   }
8432
8433   if (DONT_TOUCH(element))      /* object may be nasty to player or others */
8434   {
8435     TestIfBadThingTouchesPlayer(newx, newy);
8436     TestIfBadThingTouchesFriend(newx, newy);
8437
8438     if (!IS_CUSTOM_ELEMENT(element))
8439       TestIfBadThingTouchesOtherBadThing(newx, newy);
8440   }
8441   else if (element == EL_PENGUIN)
8442     TestIfFriendTouchesBadThing(newx, newy);
8443
8444   if (DONT_GET_HIT_BY(element))
8445   {
8446     TestIfGoodThingGetsHitByBadThing(newx, newy, direction);
8447   }
8448
8449   /* give the player one last chance (one more frame) to move away */
8450   if (CAN_FALL(element) && direction == MV_DOWN &&
8451       (last_line || (!IS_FREE(x, newy + 1) &&
8452                      (!IS_PLAYER(x, newy + 1) ||
8453                       game.engine_version < VERSION_IDENT(3,1,1,0)))))
8454     Impact(x, newy);
8455
8456   if (pushed_by_player && !game.use_change_when_pushing_bug)
8457   {
8458     int push_side = MV_DIR_OPPOSITE(direction);
8459     struct PlayerInfo *player = PLAYERINFO(x, y);
8460
8461     CheckElementChangeByPlayer(newx, newy, element, CE_PUSHED_BY_PLAYER,
8462                                player->index_bit, push_side);
8463     CheckTriggeredElementChangeByPlayer(newx,newy, element, CE_PLAYER_PUSHES_X,
8464                                         player->index_bit, push_side);
8465   }
8466
8467   if (element == EL_EMC_ANDROID && pushed_by_player)    /* make another move */
8468     MovDelay[newx][newy] = 1;
8469
8470   CheckTriggeredElementChangeBySide(x, y, element, CE_MOVE_OF_X, direction);
8471
8472   TestIfElementTouchesCustomElement(x, y);      /* empty or new element */
8473   TestIfElementHitsCustomElement(newx, newy, direction);
8474   TestIfPlayerTouchesCustomElement(newx, newy);
8475   TestIfElementTouchesCustomElement(newx, newy);
8476
8477   if (IS_CUSTOM_ELEMENT(element) && ei->move_enter_element != EL_EMPTY &&
8478       IS_EQUAL_OR_IN_GROUP(stored_new, ei->move_enter_element))
8479     CheckElementChangeBySide(newx, newy, element, stored_new, CE_DIGGING_X,
8480                              MV_DIR_OPPOSITE(direction));
8481 }
8482
8483 int AmoebeNachbarNr(int ax, int ay)
8484 {
8485   int i;
8486   int element = Feld[ax][ay];
8487   int group_nr = 0;
8488   static int xy[4][2] =
8489   {
8490     { 0, -1 },
8491     { -1, 0 },
8492     { +1, 0 },
8493     { 0, +1 }
8494   };
8495
8496   for (i = 0; i < NUM_DIRECTIONS; i++)
8497   {
8498     int x = ax + xy[i][0];
8499     int y = ay + xy[i][1];
8500
8501     if (!IN_LEV_FIELD(x, y))
8502       continue;
8503
8504     if (Feld[x][y] == element && AmoebaNr[x][y] > 0)
8505       group_nr = AmoebaNr[x][y];
8506   }
8507
8508   return group_nr;
8509 }
8510
8511 void AmoebenVereinigen(int ax, int ay)
8512 {
8513   int i, x, y, xx, yy;
8514   int new_group_nr = AmoebaNr[ax][ay];
8515   static int xy[4][2] =
8516   {
8517     { 0, -1 },
8518     { -1, 0 },
8519     { +1, 0 },
8520     { 0, +1 }
8521   };
8522
8523   if (new_group_nr == 0)
8524     return;
8525
8526   for (i = 0; i < NUM_DIRECTIONS; i++)
8527   {
8528     x = ax + xy[i][0];
8529     y = ay + xy[i][1];
8530
8531     if (!IN_LEV_FIELD(x, y))
8532       continue;
8533
8534     if ((Feld[x][y] == EL_AMOEBA_FULL ||
8535          Feld[x][y] == EL_BD_AMOEBA ||
8536          Feld[x][y] == EL_AMOEBA_DEAD) &&
8537         AmoebaNr[x][y] != new_group_nr)
8538     {
8539       int old_group_nr = AmoebaNr[x][y];
8540
8541       if (old_group_nr == 0)
8542         return;
8543
8544       AmoebaCnt[new_group_nr] += AmoebaCnt[old_group_nr];
8545       AmoebaCnt[old_group_nr] = 0;
8546       AmoebaCnt2[new_group_nr] += AmoebaCnt2[old_group_nr];
8547       AmoebaCnt2[old_group_nr] = 0;
8548
8549       SCAN_PLAYFIELD(xx, yy)
8550       {
8551         if (AmoebaNr[xx][yy] == old_group_nr)
8552           AmoebaNr[xx][yy] = new_group_nr;
8553       }
8554     }
8555   }
8556 }
8557
8558 void AmoebeUmwandeln(int ax, int ay)
8559 {
8560   int i, x, y;
8561
8562   if (Feld[ax][ay] == EL_AMOEBA_DEAD)
8563   {
8564     int group_nr = AmoebaNr[ax][ay];
8565
8566 #ifdef DEBUG
8567     if (group_nr == 0)
8568     {
8569       printf("AmoebeUmwandeln(): ax = %d, ay = %d\n", ax, ay);
8570       printf("AmoebeUmwandeln(): This should never happen!\n");
8571       return;
8572     }
8573 #endif
8574
8575     SCAN_PLAYFIELD(x, y)
8576     {
8577       if (Feld[x][y] == EL_AMOEBA_DEAD && AmoebaNr[x][y] == group_nr)
8578       {
8579         AmoebaNr[x][y] = 0;
8580         Feld[x][y] = EL_AMOEBA_TO_DIAMOND;
8581       }
8582     }
8583
8584     PlayLevelSound(ax, ay, (IS_GEM(level.amoeba_content) ?
8585                             SND_AMOEBA_TURNING_TO_GEM :
8586                             SND_AMOEBA_TURNING_TO_ROCK));
8587     Bang(ax, ay);
8588   }
8589   else
8590   {
8591     static int xy[4][2] =
8592     {
8593       { 0, -1 },
8594       { -1, 0 },
8595       { +1, 0 },
8596       { 0, +1 }
8597     };
8598
8599     for (i = 0; i < NUM_DIRECTIONS; i++)
8600     {
8601       x = ax + xy[i][0];
8602       y = ay + xy[i][1];
8603
8604       if (!IN_LEV_FIELD(x, y))
8605         continue;
8606
8607       if (Feld[x][y] == EL_AMOEBA_TO_DIAMOND)
8608       {
8609         PlayLevelSound(x, y, (IS_GEM(level.amoeba_content) ?
8610                               SND_AMOEBA_TURNING_TO_GEM :
8611                               SND_AMOEBA_TURNING_TO_ROCK));
8612         Bang(x, y);
8613       }
8614     }
8615   }
8616 }
8617
8618 void AmoebeUmwandelnBD(int ax, int ay, int new_element)
8619 {
8620   int x, y;
8621   int group_nr = AmoebaNr[ax][ay];
8622   boolean done = FALSE;
8623
8624 #ifdef DEBUG
8625   if (group_nr == 0)
8626   {
8627     printf("AmoebeUmwandelnBD(): ax = %d, ay = %d\n", ax, ay);
8628     printf("AmoebeUmwandelnBD(): This should never happen!\n");
8629     return;
8630   }
8631 #endif
8632
8633   SCAN_PLAYFIELD(x, y)
8634   {
8635     if (AmoebaNr[x][y] == group_nr &&
8636         (Feld[x][y] == EL_AMOEBA_DEAD ||
8637          Feld[x][y] == EL_BD_AMOEBA ||
8638          Feld[x][y] == EL_AMOEBA_GROWING))
8639     {
8640       AmoebaNr[x][y] = 0;
8641       Feld[x][y] = new_element;
8642       InitField(x, y, FALSE);
8643       TEST_DrawLevelField(x, y);
8644       done = TRUE;
8645     }
8646   }
8647
8648   if (done)
8649     PlayLevelSound(ax, ay, (new_element == EL_BD_ROCK ?
8650                             SND_BD_AMOEBA_TURNING_TO_ROCK :
8651                             SND_BD_AMOEBA_TURNING_TO_GEM));
8652 }
8653
8654 void AmoebeWaechst(int x, int y)
8655 {
8656   static unsigned int sound_delay = 0;
8657   static unsigned int sound_delay_value = 0;
8658
8659   if (!MovDelay[x][y])          /* start new growing cycle */
8660   {
8661     MovDelay[x][y] = 7;
8662
8663     if (DelayReached(&sound_delay, sound_delay_value))
8664     {
8665       PlayLevelSoundElementAction(x, y, Store[x][y], ACTION_GROWING);
8666       sound_delay_value = 30;
8667     }
8668   }
8669
8670   if (MovDelay[x][y])           /* wait some time before growing bigger */
8671   {
8672     MovDelay[x][y]--;
8673     if (MovDelay[x][y]/2 && IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
8674     {
8675       int frame = getGraphicAnimationFrame(IMG_AMOEBA_GROWING,
8676                                            6 - MovDelay[x][y]);
8677
8678       DrawGraphic(SCREENX(x), SCREENY(y), IMG_AMOEBA_GROWING, frame);
8679     }
8680
8681     if (!MovDelay[x][y])
8682     {
8683       Feld[x][y] = Store[x][y];
8684       Store[x][y] = 0;
8685       TEST_DrawLevelField(x, y);
8686     }
8687   }
8688 }
8689
8690 void AmoebaDisappearing(int x, int y)
8691 {
8692   static unsigned int sound_delay = 0;
8693   static unsigned int sound_delay_value = 0;
8694
8695   if (!MovDelay[x][y])          /* start new shrinking cycle */
8696   {
8697     MovDelay[x][y] = 7;
8698
8699     if (DelayReached(&sound_delay, sound_delay_value))
8700       sound_delay_value = 30;
8701   }
8702
8703   if (MovDelay[x][y])           /* wait some time before shrinking */
8704   {
8705     MovDelay[x][y]--;
8706     if (MovDelay[x][y]/2 && IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
8707     {
8708       int frame = getGraphicAnimationFrame(IMG_AMOEBA_SHRINKING,
8709                                            6 - MovDelay[x][y]);
8710
8711       DrawGraphic(SCREENX(x), SCREENY(y), IMG_AMOEBA_SHRINKING, frame);
8712     }
8713
8714     if (!MovDelay[x][y])
8715     {
8716       Feld[x][y] = EL_EMPTY;
8717       TEST_DrawLevelField(x, y);
8718
8719       /* don't let mole enter this field in this cycle;
8720          (give priority to objects falling to this field from above) */
8721       Stop[x][y] = TRUE;
8722     }
8723   }
8724 }
8725
8726 void AmoebeAbleger(int ax, int ay)
8727 {
8728   int i;
8729   int element = Feld[ax][ay];
8730   int graphic = el2img(element);
8731   int newax = ax, neway = ay;
8732   boolean can_drop = (element == EL_AMOEBA_WET || element == EL_EMC_DRIPPER);
8733   static int xy[4][2] =
8734   {
8735     { 0, -1 },
8736     { -1, 0 },
8737     { +1, 0 },
8738     { 0, +1 }
8739   };
8740
8741   if (!level.amoeba_speed && element != EL_EMC_DRIPPER)
8742   {
8743     Feld[ax][ay] = EL_AMOEBA_DEAD;
8744     TEST_DrawLevelField(ax, ay);
8745     return;
8746   }
8747
8748   if (IS_ANIMATED(graphic))
8749     DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
8750
8751   if (!MovDelay[ax][ay])        /* start making new amoeba field */
8752     MovDelay[ax][ay] = RND(FRAMES_PER_SECOND * 25 / (1 + level.amoeba_speed));
8753
8754   if (MovDelay[ax][ay])         /* wait some time before making new amoeba */
8755   {
8756     MovDelay[ax][ay]--;
8757     if (MovDelay[ax][ay])
8758       return;
8759   }
8760
8761   if (can_drop)                 /* EL_AMOEBA_WET or EL_EMC_DRIPPER */
8762   {
8763     int start = RND(4);
8764     int x = ax + xy[start][0];
8765     int y = ay + xy[start][1];
8766
8767     if (!IN_LEV_FIELD(x, y))
8768       return;
8769
8770     if (IS_FREE(x, y) ||
8771         CAN_GROW_INTO(Feld[x][y]) ||
8772         Feld[x][y] == EL_QUICKSAND_EMPTY ||
8773         Feld[x][y] == EL_QUICKSAND_FAST_EMPTY)
8774     {
8775       newax = x;
8776       neway = y;
8777     }
8778
8779     if (newax == ax && neway == ay)
8780       return;
8781   }
8782   else                          /* normal or "filled" (BD style) amoeba */
8783   {
8784     int start = RND(4);
8785     boolean waiting_for_player = FALSE;
8786
8787     for (i = 0; i < NUM_DIRECTIONS; i++)
8788     {
8789       int j = (start + i) % 4;
8790       int x = ax + xy[j][0];
8791       int y = ay + xy[j][1];
8792
8793       if (!IN_LEV_FIELD(x, y))
8794         continue;
8795
8796       if (IS_FREE(x, y) ||
8797           CAN_GROW_INTO(Feld[x][y]) ||
8798           Feld[x][y] == EL_QUICKSAND_EMPTY ||
8799           Feld[x][y] == EL_QUICKSAND_FAST_EMPTY)
8800       {
8801         newax = x;
8802         neway = y;
8803         break;
8804       }
8805       else if (IS_PLAYER(x, y))
8806         waiting_for_player = TRUE;
8807     }
8808
8809     if (newax == ax && neway == ay)             /* amoeba cannot grow */
8810     {
8811       if (i == 4 && (!waiting_for_player || element == EL_BD_AMOEBA))
8812       {
8813         Feld[ax][ay] = EL_AMOEBA_DEAD;
8814         TEST_DrawLevelField(ax, ay);
8815         AmoebaCnt[AmoebaNr[ax][ay]]--;
8816
8817         if (AmoebaCnt[AmoebaNr[ax][ay]] <= 0)   /* amoeba is completely dead */
8818         {
8819           if (element == EL_AMOEBA_FULL)
8820             AmoebeUmwandeln(ax, ay);
8821           else if (element == EL_BD_AMOEBA)
8822             AmoebeUmwandelnBD(ax, ay, level.amoeba_content);
8823         }
8824       }
8825       return;
8826     }
8827     else if (element == EL_AMOEBA_FULL || element == EL_BD_AMOEBA)
8828     {
8829       /* amoeba gets larger by growing in some direction */
8830
8831       int new_group_nr = AmoebaNr[ax][ay];
8832
8833 #ifdef DEBUG
8834   if (new_group_nr == 0)
8835   {
8836     printf("AmoebeAbleger(): newax = %d, neway = %d\n", newax, neway);
8837     printf("AmoebeAbleger(): This should never happen!\n");
8838     return;
8839   }
8840 #endif
8841
8842       AmoebaNr[newax][neway] = new_group_nr;
8843       AmoebaCnt[new_group_nr]++;
8844       AmoebaCnt2[new_group_nr]++;
8845
8846       /* if amoeba touches other amoeba(s) after growing, unify them */
8847       AmoebenVereinigen(newax, neway);
8848
8849       if (element == EL_BD_AMOEBA && AmoebaCnt2[new_group_nr] >= 200)
8850       {
8851         AmoebeUmwandelnBD(newax, neway, EL_BD_ROCK);
8852         return;
8853       }
8854     }
8855   }
8856
8857   if (!can_drop || neway < ay || !IS_FREE(newax, neway) ||
8858       (neway == lev_fieldy - 1 && newax != ax))
8859   {
8860     Feld[newax][neway] = EL_AMOEBA_GROWING;     /* creation of new amoeba */
8861     Store[newax][neway] = element;
8862   }
8863   else if (neway == ay || element == EL_EMC_DRIPPER)
8864   {
8865     Feld[newax][neway] = EL_AMOEBA_DROP;        /* drop left/right of amoeba */
8866
8867     PlayLevelSoundAction(newax, neway, ACTION_GROWING);
8868   }
8869   else
8870   {
8871     InitMovingField(ax, ay, MV_DOWN);           /* drop dripping from amoeba */
8872     Feld[ax][ay] = EL_AMOEBA_DROPPING;
8873     Store[ax][ay] = EL_AMOEBA_DROP;
8874     ContinueMoving(ax, ay);
8875     return;
8876   }
8877
8878   TEST_DrawLevelField(newax, neway);
8879 }
8880
8881 void Life(int ax, int ay)
8882 {
8883   int x1, y1, x2, y2;
8884   int life_time = 40;
8885   int element = Feld[ax][ay];
8886   int graphic = el2img(element);
8887   int *life_parameter = (element == EL_GAME_OF_LIFE ? level.game_of_life :
8888                          level.biomaze);
8889   boolean changed = FALSE;
8890
8891   if (IS_ANIMATED(graphic))
8892     DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
8893
8894   if (Stop[ax][ay])
8895     return;
8896
8897   if (!MovDelay[ax][ay])        /* start new "game of life" cycle */
8898     MovDelay[ax][ay] = life_time;
8899
8900   if (MovDelay[ax][ay])         /* wait some time before next cycle */
8901   {
8902     MovDelay[ax][ay]--;
8903     if (MovDelay[ax][ay])
8904       return;
8905   }
8906
8907   for (y1 = -1; y1 < 2; y1++) for (x1 = -1; x1 < 2; x1++)
8908   {
8909     int xx = ax+x1, yy = ay+y1;
8910     int nachbarn = 0;
8911
8912     if (!IN_LEV_FIELD(xx, yy))
8913       continue;
8914
8915     for (y2 = -1; y2 < 2; y2++) for (x2 = -1; x2 < 2; x2++)
8916     {
8917       int x = xx+x2, y = yy+y2;
8918
8919       if (!IN_LEV_FIELD(x, y) || (x == xx && y == yy))
8920         continue;
8921
8922       if (((Feld[x][y] == element ||
8923             (element == EL_GAME_OF_LIFE && IS_PLAYER(x, y))) &&
8924            !Stop[x][y]) ||
8925           (IS_FREE(x, y) && Stop[x][y]))
8926         nachbarn++;
8927     }
8928
8929     if (xx == ax && yy == ay)           /* field in the middle */
8930     {
8931       if (nachbarn < life_parameter[0] ||
8932           nachbarn > life_parameter[1])
8933       {
8934         Feld[xx][yy] = EL_EMPTY;
8935         if (!Stop[xx][yy])
8936           TEST_DrawLevelField(xx, yy);
8937         Stop[xx][yy] = TRUE;
8938         changed = TRUE;
8939       }
8940     }
8941     else if (IS_FREE(xx, yy) || CAN_GROW_INTO(Feld[xx][yy]))
8942     {                                   /* free border field */
8943       if (nachbarn >= life_parameter[2] &&
8944           nachbarn <= life_parameter[3])
8945       {
8946         Feld[xx][yy] = element;
8947         MovDelay[xx][yy] = (element == EL_GAME_OF_LIFE ? 0 : life_time-1);
8948         if (!Stop[xx][yy])
8949           TEST_DrawLevelField(xx, yy);
8950         Stop[xx][yy] = TRUE;
8951         changed = TRUE;
8952       }
8953     }
8954   }
8955
8956   if (changed)
8957     PlayLevelSound(ax, ay, element == EL_BIOMAZE ? SND_BIOMAZE_GROWING :
8958                    SND_GAME_OF_LIFE_GROWING);
8959 }
8960
8961 static void InitRobotWheel(int x, int y)
8962 {
8963   ChangeDelay[x][y] = level.time_wheel * FRAMES_PER_SECOND;
8964 }
8965
8966 static void RunRobotWheel(int x, int y)
8967 {
8968   PlayLevelSound(x, y, SND_ROBOT_WHEEL_ACTIVE);
8969 }
8970
8971 static void StopRobotWheel(int x, int y)
8972 {
8973   if (ZX == x && ZY == y)
8974   {
8975     ZX = ZY = -1;
8976
8977     game.robot_wheel_active = FALSE;
8978   }
8979 }
8980
8981 static void InitTimegateWheel(int x, int y)
8982 {
8983   ChangeDelay[x][y] = level.time_timegate * FRAMES_PER_SECOND;
8984 }
8985
8986 static void RunTimegateWheel(int x, int y)
8987 {
8988   PlayLevelSound(x, y, SND_CLASS_TIMEGATE_SWITCH_ACTIVE);
8989 }
8990
8991 static void InitMagicBallDelay(int x, int y)
8992 {
8993   ChangeDelay[x][y] = (level.ball_time + 1) * 8 + 1;
8994 }
8995
8996 static void ActivateMagicBall(int bx, int by)
8997 {
8998   int x, y;
8999
9000   if (level.ball_random)
9001   {
9002     int pos_border = RND(8);    /* select one of the eight border elements */
9003     int pos_content = (pos_border > 3 ? pos_border + 1 : pos_border);
9004     int xx = pos_content % 3;
9005     int yy = pos_content / 3;
9006
9007     x = bx - 1 + xx;
9008     y = by - 1 + yy;
9009
9010     if (IN_LEV_FIELD(x, y) && Feld[x][y] == EL_EMPTY)
9011       CreateField(x, y, level.ball_content[game.ball_content_nr].e[xx][yy]);
9012   }
9013   else
9014   {
9015     for (y = by - 1; y <= by + 1; y++) for (x = bx - 1; x <= bx + 1; x++)
9016     {
9017       int xx = x - bx + 1;
9018       int yy = y - by + 1;
9019
9020       if (IN_LEV_FIELD(x, y) && Feld[x][y] == EL_EMPTY)
9021         CreateField(x, y, level.ball_content[game.ball_content_nr].e[xx][yy]);
9022     }
9023   }
9024
9025   game.ball_content_nr = (game.ball_content_nr + 1) % level.num_ball_contents;
9026 }
9027
9028 void CheckExit(int x, int y)
9029 {
9030   if (local_player->gems_still_needed > 0 ||
9031       local_player->sokobanfields_still_needed > 0 ||
9032       local_player->lights_still_needed > 0)
9033   {
9034     int element = Feld[x][y];
9035     int graphic = el2img(element);
9036
9037     if (IS_ANIMATED(graphic))
9038       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
9039
9040     return;
9041   }
9042
9043   if (AllPlayersGone)   /* do not re-open exit door closed after last player */
9044     return;
9045
9046   Feld[x][y] = EL_EXIT_OPENING;
9047
9048   PlayLevelSoundNearest(x, y, SND_CLASS_EXIT_OPENING);
9049 }
9050
9051 void CheckExitEM(int x, int y)
9052 {
9053   if (local_player->gems_still_needed > 0 ||
9054       local_player->sokobanfields_still_needed > 0 ||
9055       local_player->lights_still_needed > 0)
9056   {
9057     int element = Feld[x][y];
9058     int graphic = el2img(element);
9059
9060     if (IS_ANIMATED(graphic))
9061       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
9062
9063     return;
9064   }
9065
9066   if (AllPlayersGone)   /* do not re-open exit door closed after last player */
9067     return;
9068
9069   Feld[x][y] = EL_EM_EXIT_OPENING;
9070
9071   PlayLevelSoundNearest(x, y, SND_CLASS_EM_EXIT_OPENING);
9072 }
9073
9074 void CheckExitSteel(int x, int y)
9075 {
9076   if (local_player->gems_still_needed > 0 ||
9077       local_player->sokobanfields_still_needed > 0 ||
9078       local_player->lights_still_needed > 0)
9079   {
9080     int element = Feld[x][y];
9081     int graphic = el2img(element);
9082
9083     if (IS_ANIMATED(graphic))
9084       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
9085
9086     return;
9087   }
9088
9089   if (AllPlayersGone)   /* do not re-open exit door closed after last player */
9090     return;
9091
9092   Feld[x][y] = EL_STEEL_EXIT_OPENING;
9093
9094   PlayLevelSoundNearest(x, y, SND_CLASS_STEEL_EXIT_OPENING);
9095 }
9096
9097 void CheckExitSteelEM(int x, int y)
9098 {
9099   if (local_player->gems_still_needed > 0 ||
9100       local_player->sokobanfields_still_needed > 0 ||
9101       local_player->lights_still_needed > 0)
9102   {
9103     int element = Feld[x][y];
9104     int graphic = el2img(element);
9105
9106     if (IS_ANIMATED(graphic))
9107       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
9108
9109     return;
9110   }
9111
9112   if (AllPlayersGone)   /* do not re-open exit door closed after last player */
9113     return;
9114
9115   Feld[x][y] = EL_EM_STEEL_EXIT_OPENING;
9116
9117   PlayLevelSoundNearest(x, y, SND_CLASS_EM_STEEL_EXIT_OPENING);
9118 }
9119
9120 void CheckExitSP(int x, int y)
9121 {
9122   if (local_player->gems_still_needed > 0)
9123   {
9124     int element = Feld[x][y];
9125     int graphic = el2img(element);
9126
9127     if (IS_ANIMATED(graphic))
9128       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
9129
9130     return;
9131   }
9132
9133   if (AllPlayersGone)   /* do not re-open exit door closed after last player */
9134     return;
9135
9136   Feld[x][y] = EL_SP_EXIT_OPENING;
9137
9138   PlayLevelSoundNearest(x, y, SND_CLASS_SP_EXIT_OPENING);
9139 }
9140
9141 static void CloseAllOpenTimegates()
9142 {
9143   int x, y;
9144
9145   SCAN_PLAYFIELD(x, y)
9146   {
9147     int element = Feld[x][y];
9148
9149     if (element == EL_TIMEGATE_OPEN || element == EL_TIMEGATE_OPENING)
9150     {
9151       Feld[x][y] = EL_TIMEGATE_CLOSING;
9152
9153       PlayLevelSoundAction(x, y, ACTION_CLOSING);
9154     }
9155   }
9156 }
9157
9158 void DrawTwinkleOnField(int x, int y)
9159 {
9160   if (!IN_SCR_FIELD(SCREENX(x), SCREENY(y)) || IS_MOVING(x, y))
9161     return;
9162
9163   if (Feld[x][y] == EL_BD_DIAMOND)
9164     return;
9165
9166   if (MovDelay[x][y] == 0)      /* next animation frame */
9167     MovDelay[x][y] = 11 * !GetSimpleRandom(500);
9168
9169   if (MovDelay[x][y] != 0)      /* wait some time before next frame */
9170   {
9171     MovDelay[x][y]--;
9172
9173     DrawLevelElementAnimation(x, y, Feld[x][y]);
9174
9175     if (MovDelay[x][y] != 0)
9176     {
9177       int frame = getGraphicAnimationFrame(IMG_TWINKLE_WHITE,
9178                                            10 - MovDelay[x][y]);
9179
9180       DrawGraphicThruMask(SCREENX(x), SCREENY(y), IMG_TWINKLE_WHITE, frame);
9181     }
9182   }
9183 }
9184
9185 void MauerWaechst(int x, int y)
9186 {
9187   int delay = 6;
9188
9189   if (!MovDelay[x][y])          /* next animation frame */
9190     MovDelay[x][y] = 3 * delay;
9191
9192   if (MovDelay[x][y])           /* wait some time before next frame */
9193   {
9194     MovDelay[x][y]--;
9195
9196     if (IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
9197     {
9198       int graphic = el_dir2img(Feld[x][y], GfxDir[x][y]);
9199       int frame = getGraphicAnimationFrame(graphic, 17 - MovDelay[x][y]);
9200
9201       DrawGraphic(SCREENX(x), SCREENY(y), graphic, frame);
9202     }
9203
9204     if (!MovDelay[x][y])
9205     {
9206       if (MovDir[x][y] == MV_LEFT)
9207       {
9208         if (IN_LEV_FIELD(x - 1, y) && IS_WALL(Feld[x - 1][y]))
9209           TEST_DrawLevelField(x - 1, y);
9210       }
9211       else if (MovDir[x][y] == MV_RIGHT)
9212       {
9213         if (IN_LEV_FIELD(x + 1, y) && IS_WALL(Feld[x + 1][y]))
9214           TEST_DrawLevelField(x + 1, y);
9215       }
9216       else if (MovDir[x][y] == MV_UP)
9217       {
9218         if (IN_LEV_FIELD(x, y - 1) && IS_WALL(Feld[x][y - 1]))
9219           TEST_DrawLevelField(x, y - 1);
9220       }
9221       else
9222       {
9223         if (IN_LEV_FIELD(x, y + 1) && IS_WALL(Feld[x][y + 1]))
9224           TEST_DrawLevelField(x, y + 1);
9225       }
9226
9227       Feld[x][y] = Store[x][y];
9228       Store[x][y] = 0;
9229       GfxDir[x][y] = MovDir[x][y] = MV_NONE;
9230       TEST_DrawLevelField(x, y);
9231     }
9232   }
9233 }
9234
9235 void MauerAbleger(int ax, int ay)
9236 {
9237   int element = Feld[ax][ay];
9238   int graphic = el2img(element);
9239   boolean oben_frei = FALSE, unten_frei = FALSE;
9240   boolean links_frei = FALSE, rechts_frei = FALSE;
9241   boolean oben_massiv = FALSE, unten_massiv = FALSE;
9242   boolean links_massiv = FALSE, rechts_massiv = FALSE;
9243   boolean new_wall = FALSE;
9244
9245   if (IS_ANIMATED(graphic))
9246     DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
9247
9248   if (!MovDelay[ax][ay])        /* start building new wall */
9249     MovDelay[ax][ay] = 6;
9250
9251   if (MovDelay[ax][ay])         /* wait some time before building new wall */
9252   {
9253     MovDelay[ax][ay]--;
9254     if (MovDelay[ax][ay])
9255       return;
9256   }
9257
9258   if (IN_LEV_FIELD(ax, ay-1) && IS_FREE(ax, ay-1))
9259     oben_frei = TRUE;
9260   if (IN_LEV_FIELD(ax, ay+1) && IS_FREE(ax, ay+1))
9261     unten_frei = TRUE;
9262   if (IN_LEV_FIELD(ax-1, ay) && IS_FREE(ax-1, ay))
9263     links_frei = TRUE;
9264   if (IN_LEV_FIELD(ax+1, ay) && IS_FREE(ax+1, ay))
9265     rechts_frei = TRUE;
9266
9267   if (element == EL_EXPANDABLE_WALL_VERTICAL ||
9268       element == EL_EXPANDABLE_WALL_ANY)
9269   {
9270     if (oben_frei)
9271     {
9272       Feld[ax][ay-1] = EL_EXPANDABLE_WALL_GROWING;
9273       Store[ax][ay-1] = element;
9274       GfxDir[ax][ay-1] = MovDir[ax][ay-1] = MV_UP;
9275       if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay-1)))
9276         DrawGraphic(SCREENX(ax), SCREENY(ay - 1),
9277                     IMG_EXPANDABLE_WALL_GROWING_UP, 0);
9278       new_wall = TRUE;
9279     }
9280     if (unten_frei)
9281     {
9282       Feld[ax][ay+1] = EL_EXPANDABLE_WALL_GROWING;
9283       Store[ax][ay+1] = element;
9284       GfxDir[ax][ay+1] = MovDir[ax][ay+1] = MV_DOWN;
9285       if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay+1)))
9286         DrawGraphic(SCREENX(ax), SCREENY(ay + 1),
9287                     IMG_EXPANDABLE_WALL_GROWING_DOWN, 0);
9288       new_wall = TRUE;
9289     }
9290   }
9291
9292   if (element == EL_EXPANDABLE_WALL_HORIZONTAL ||
9293       element == EL_EXPANDABLE_WALL_ANY ||
9294       element == EL_EXPANDABLE_WALL ||
9295       element == EL_BD_EXPANDABLE_WALL)
9296   {
9297     if (links_frei)
9298     {
9299       Feld[ax-1][ay] = EL_EXPANDABLE_WALL_GROWING;
9300       Store[ax-1][ay] = element;
9301       GfxDir[ax-1][ay] = MovDir[ax-1][ay] = MV_LEFT;
9302       if (IN_SCR_FIELD(SCREENX(ax-1), SCREENY(ay)))
9303         DrawGraphic(SCREENX(ax - 1), SCREENY(ay),
9304                     IMG_EXPANDABLE_WALL_GROWING_LEFT, 0);
9305       new_wall = TRUE;
9306     }
9307
9308     if (rechts_frei)
9309     {
9310       Feld[ax+1][ay] = EL_EXPANDABLE_WALL_GROWING;
9311       Store[ax+1][ay] = element;
9312       GfxDir[ax+1][ay] = MovDir[ax+1][ay] = MV_RIGHT;
9313       if (IN_SCR_FIELD(SCREENX(ax+1), SCREENY(ay)))
9314         DrawGraphic(SCREENX(ax + 1), SCREENY(ay),
9315                     IMG_EXPANDABLE_WALL_GROWING_RIGHT, 0);
9316       new_wall = TRUE;
9317     }
9318   }
9319
9320   if (element == EL_EXPANDABLE_WALL && (links_frei || rechts_frei))
9321     TEST_DrawLevelField(ax, ay);
9322
9323   if (!IN_LEV_FIELD(ax, ay-1) || IS_WALL(Feld[ax][ay-1]))
9324     oben_massiv = TRUE;
9325   if (!IN_LEV_FIELD(ax, ay+1) || IS_WALL(Feld[ax][ay+1]))
9326     unten_massiv = TRUE;
9327   if (!IN_LEV_FIELD(ax-1, ay) || IS_WALL(Feld[ax-1][ay]))
9328     links_massiv = TRUE;
9329   if (!IN_LEV_FIELD(ax+1, ay) || IS_WALL(Feld[ax+1][ay]))
9330     rechts_massiv = TRUE;
9331
9332   if (((oben_massiv && unten_massiv) ||
9333        element == EL_EXPANDABLE_WALL_HORIZONTAL ||
9334        element == EL_EXPANDABLE_WALL) &&
9335       ((links_massiv && rechts_massiv) ||
9336        element == EL_EXPANDABLE_WALL_VERTICAL))
9337     Feld[ax][ay] = EL_WALL;
9338
9339   if (new_wall)
9340     PlayLevelSoundAction(ax, ay, ACTION_GROWING);
9341 }
9342
9343 void MauerAblegerStahl(int ax, int ay)
9344 {
9345   int element = Feld[ax][ay];
9346   int graphic = el2img(element);
9347   boolean oben_frei = FALSE, unten_frei = FALSE;
9348   boolean links_frei = FALSE, rechts_frei = FALSE;
9349   boolean oben_massiv = FALSE, unten_massiv = FALSE;
9350   boolean links_massiv = FALSE, rechts_massiv = FALSE;
9351   boolean new_wall = FALSE;
9352
9353   if (IS_ANIMATED(graphic))
9354     DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
9355
9356   if (!MovDelay[ax][ay])        /* start building new wall */
9357     MovDelay[ax][ay] = 6;
9358
9359   if (MovDelay[ax][ay])         /* wait some time before building new wall */
9360   {
9361     MovDelay[ax][ay]--;
9362     if (MovDelay[ax][ay])
9363       return;
9364   }
9365
9366   if (IN_LEV_FIELD(ax, ay-1) && IS_FREE(ax, ay-1))
9367     oben_frei = TRUE;
9368   if (IN_LEV_FIELD(ax, ay+1) && IS_FREE(ax, ay+1))
9369     unten_frei = TRUE;
9370   if (IN_LEV_FIELD(ax-1, ay) && IS_FREE(ax-1, ay))
9371     links_frei = TRUE;
9372   if (IN_LEV_FIELD(ax+1, ay) && IS_FREE(ax+1, ay))
9373     rechts_frei = TRUE;
9374
9375   if (element == EL_EXPANDABLE_STEELWALL_VERTICAL ||
9376       element == EL_EXPANDABLE_STEELWALL_ANY)
9377   {
9378     if (oben_frei)
9379     {
9380       Feld[ax][ay-1] = EL_EXPANDABLE_STEELWALL_GROWING;
9381       Store[ax][ay-1] = element;
9382       GfxDir[ax][ay-1] = MovDir[ax][ay-1] = MV_UP;
9383       if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay-1)))
9384         DrawGraphic(SCREENX(ax), SCREENY(ay - 1),
9385                     IMG_EXPANDABLE_STEELWALL_GROWING_UP, 0);
9386       new_wall = TRUE;
9387     }
9388     if (unten_frei)
9389     {
9390       Feld[ax][ay+1] = EL_EXPANDABLE_STEELWALL_GROWING;
9391       Store[ax][ay+1] = element;
9392       GfxDir[ax][ay+1] = MovDir[ax][ay+1] = MV_DOWN;
9393       if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay+1)))
9394         DrawGraphic(SCREENX(ax), SCREENY(ay + 1),
9395                     IMG_EXPANDABLE_STEELWALL_GROWING_DOWN, 0);
9396       new_wall = TRUE;
9397     }
9398   }
9399
9400   if (element == EL_EXPANDABLE_STEELWALL_HORIZONTAL ||
9401       element == EL_EXPANDABLE_STEELWALL_ANY)
9402   {
9403     if (links_frei)
9404     {
9405       Feld[ax-1][ay] = EL_EXPANDABLE_STEELWALL_GROWING;
9406       Store[ax-1][ay] = element;
9407       GfxDir[ax-1][ay] = MovDir[ax-1][ay] = MV_LEFT;
9408       if (IN_SCR_FIELD(SCREENX(ax-1), SCREENY(ay)))
9409         DrawGraphic(SCREENX(ax - 1), SCREENY(ay),
9410                     IMG_EXPANDABLE_STEELWALL_GROWING_LEFT, 0);
9411       new_wall = TRUE;
9412     }
9413
9414     if (rechts_frei)
9415     {
9416       Feld[ax+1][ay] = EL_EXPANDABLE_STEELWALL_GROWING;
9417       Store[ax+1][ay] = element;
9418       GfxDir[ax+1][ay] = MovDir[ax+1][ay] = MV_RIGHT;
9419       if (IN_SCR_FIELD(SCREENX(ax+1), SCREENY(ay)))
9420         DrawGraphic(SCREENX(ax + 1), SCREENY(ay),
9421                     IMG_EXPANDABLE_STEELWALL_GROWING_RIGHT, 0);
9422       new_wall = TRUE;
9423     }
9424   }
9425
9426   if (!IN_LEV_FIELD(ax, ay-1) || IS_WALL(Feld[ax][ay-1]))
9427     oben_massiv = TRUE;
9428   if (!IN_LEV_FIELD(ax, ay+1) || IS_WALL(Feld[ax][ay+1]))
9429     unten_massiv = TRUE;
9430   if (!IN_LEV_FIELD(ax-1, ay) || IS_WALL(Feld[ax-1][ay]))
9431     links_massiv = TRUE;
9432   if (!IN_LEV_FIELD(ax+1, ay) || IS_WALL(Feld[ax+1][ay]))
9433     rechts_massiv = TRUE;
9434
9435   if (((oben_massiv && unten_massiv) ||
9436        element == EL_EXPANDABLE_STEELWALL_HORIZONTAL) &&
9437       ((links_massiv && rechts_massiv) ||
9438        element == EL_EXPANDABLE_STEELWALL_VERTICAL))
9439     Feld[ax][ay] = EL_STEELWALL;
9440
9441   if (new_wall)
9442     PlayLevelSoundAction(ax, ay, ACTION_GROWING);
9443 }
9444
9445 void CheckForDragon(int x, int y)
9446 {
9447   int i, j;
9448   boolean dragon_found = FALSE;
9449   static int xy[4][2] =
9450   {
9451     { 0, -1 },
9452     { -1, 0 },
9453     { +1, 0 },
9454     { 0, +1 }
9455   };
9456
9457   for (i = 0; i < NUM_DIRECTIONS; i++)
9458   {
9459     for (j = 0; j < 4; j++)
9460     {
9461       int xx = x + j * xy[i][0], yy = y + j * xy[i][1];
9462
9463       if (IN_LEV_FIELD(xx, yy) &&
9464           (Feld[xx][yy] == EL_FLAMES || Feld[xx][yy] == EL_DRAGON))
9465       {
9466         if (Feld[xx][yy] == EL_DRAGON)
9467           dragon_found = TRUE;
9468       }
9469       else
9470         break;
9471     }
9472   }
9473
9474   if (!dragon_found)
9475   {
9476     for (i = 0; i < NUM_DIRECTIONS; i++)
9477     {
9478       for (j = 0; j < 3; j++)
9479       {
9480         int xx = x + j * xy[i][0], yy = y + j * xy[i][1];
9481
9482         if (IN_LEV_FIELD(xx, yy) && Feld[xx][yy] == EL_FLAMES)
9483         {
9484           Feld[xx][yy] = EL_EMPTY;
9485           TEST_DrawLevelField(xx, yy);
9486         }
9487         else
9488           break;
9489       }
9490     }
9491   }
9492 }
9493
9494 static void InitBuggyBase(int x, int y)
9495 {
9496   int element = Feld[x][y];
9497   int activating_delay = FRAMES_PER_SECOND / 4;
9498
9499   ChangeDelay[x][y] =
9500     (element == EL_SP_BUGGY_BASE ?
9501      2 * FRAMES_PER_SECOND + RND(5 * FRAMES_PER_SECOND) - activating_delay :
9502      element == EL_SP_BUGGY_BASE_ACTIVATING ?
9503      activating_delay :
9504      element == EL_SP_BUGGY_BASE_ACTIVE ?
9505      1 * FRAMES_PER_SECOND + RND(1 * FRAMES_PER_SECOND) : 1);
9506 }
9507
9508 static void WarnBuggyBase(int x, int y)
9509 {
9510   int i;
9511   static int xy[4][2] =
9512   {
9513     { 0, -1 },
9514     { -1, 0 },
9515     { +1, 0 },
9516     { 0, +1 }
9517   };
9518
9519   for (i = 0; i < NUM_DIRECTIONS; i++)
9520   {
9521     int xx = x + xy[i][0];
9522     int yy = y + xy[i][1];
9523
9524     if (IN_LEV_FIELD(xx, yy) && IS_PLAYER(xx, yy))
9525     {
9526       PlayLevelSound(x, y, SND_SP_BUGGY_BASE_ACTIVE);
9527
9528       break;
9529     }
9530   }
9531 }
9532
9533 static void InitTrap(int x, int y)
9534 {
9535   ChangeDelay[x][y] = 2 * FRAMES_PER_SECOND + RND(5 * FRAMES_PER_SECOND);
9536 }
9537
9538 static void ActivateTrap(int x, int y)
9539 {
9540   PlayLevelSound(x, y, SND_TRAP_ACTIVATING);
9541 }
9542
9543 static void ChangeActiveTrap(int x, int y)
9544 {
9545   int graphic = IMG_TRAP_ACTIVE;
9546
9547   /* if new animation frame was drawn, correct crumbled sand border */
9548   if (IS_NEW_FRAME(GfxFrame[x][y], graphic))
9549     TEST_DrawLevelFieldCrumbled(x, y);
9550 }
9551
9552 static int getSpecialActionElement(int element, int number, int base_element)
9553 {
9554   return (element != EL_EMPTY ? element :
9555           number != -1 ? base_element + number - 1 :
9556           EL_EMPTY);
9557 }
9558
9559 static int getModifiedActionNumber(int value_old, int operator, int operand,
9560                                    int value_min, int value_max)
9561 {
9562   int value_new = (operator == CA_MODE_SET      ? operand :
9563                    operator == CA_MODE_ADD      ? value_old + operand :
9564                    operator == CA_MODE_SUBTRACT ? value_old - operand :
9565                    operator == CA_MODE_MULTIPLY ? value_old * operand :
9566                    operator == CA_MODE_DIVIDE   ? value_old / MAX(1, operand) :
9567                    operator == CA_MODE_MODULO   ? value_old % MAX(1, operand) :
9568                    value_old);
9569
9570   return (value_new < value_min ? value_min :
9571           value_new > value_max ? value_max :
9572           value_new);
9573 }
9574
9575 static void ExecuteCustomElementAction(int x, int y, int element, int page)
9576 {
9577   struct ElementInfo *ei = &element_info[element];
9578   struct ElementChangeInfo *change = &ei->change_page[page];
9579   int target_element = change->target_element;
9580   int action_type = change->action_type;
9581   int action_mode = change->action_mode;
9582   int action_arg = change->action_arg;
9583   int action_element = change->action_element;
9584   int i;
9585
9586   if (!change->has_action)
9587     return;
9588
9589   /* ---------- determine action paramater values -------------------------- */
9590
9591   int level_time_value =
9592     (level.time > 0 ? TimeLeft :
9593      TimePlayed);
9594
9595   int action_arg_element_raw =
9596     (action_arg == CA_ARG_PLAYER_TRIGGER  ? change->actual_trigger_player :
9597      action_arg == CA_ARG_ELEMENT_TRIGGER ? change->actual_trigger_element :
9598      action_arg == CA_ARG_ELEMENT_TARGET  ? change->target_element :
9599      action_arg == CA_ARG_ELEMENT_ACTION  ? change->action_element :
9600      action_arg == CA_ARG_INVENTORY_RM_TRIGGER ? change->actual_trigger_element:
9601      action_arg == CA_ARG_INVENTORY_RM_TARGET  ? change->target_element :
9602      action_arg == CA_ARG_INVENTORY_RM_ACTION  ? change->action_element :
9603      EL_EMPTY);
9604   int action_arg_element = GetElementFromGroupElement(action_arg_element_raw);
9605
9606   int action_arg_direction =
9607     (action_arg >= CA_ARG_DIRECTION_LEFT &&
9608      action_arg <= CA_ARG_DIRECTION_DOWN ? action_arg - CA_ARG_DIRECTION :
9609      action_arg == CA_ARG_DIRECTION_TRIGGER ?
9610      change->actual_trigger_side :
9611      action_arg == CA_ARG_DIRECTION_TRIGGER_BACK ?
9612      MV_DIR_OPPOSITE(change->actual_trigger_side) :
9613      MV_NONE);
9614
9615   int action_arg_number_min =
9616     (action_type == CA_SET_PLAYER_SPEED ? STEPSIZE_NOT_MOVING :
9617      CA_ARG_MIN);
9618
9619   int action_arg_number_max =
9620     (action_type == CA_SET_PLAYER_SPEED ? STEPSIZE_EVEN_FASTER :
9621      action_type == CA_SET_LEVEL_GEMS ? 999 :
9622      action_type == CA_SET_LEVEL_TIME ? 9999 :
9623      action_type == CA_SET_LEVEL_SCORE ? 99999 :
9624      action_type == CA_SET_CE_VALUE ? 9999 :
9625      action_type == CA_SET_CE_SCORE ? 9999 :
9626      CA_ARG_MAX);
9627
9628   int action_arg_number_reset =
9629     (action_type == CA_SET_PLAYER_SPEED ? level.initial_player_stepsize[0] :
9630      action_type == CA_SET_LEVEL_GEMS ? level.gems_needed :
9631      action_type == CA_SET_LEVEL_TIME ? level.time :
9632      action_type == CA_SET_LEVEL_SCORE ? 0 :
9633      action_type == CA_SET_CE_VALUE ? GET_NEW_CE_VALUE(element) :
9634      action_type == CA_SET_CE_SCORE ? 0 :
9635      0);
9636
9637   int action_arg_number =
9638     (action_arg <= CA_ARG_MAX ? action_arg :
9639      action_arg >= CA_ARG_SPEED_NOT_MOVING &&
9640      action_arg <= CA_ARG_SPEED_EVEN_FASTER ? (action_arg - CA_ARG_SPEED) :
9641      action_arg == CA_ARG_SPEED_RESET ? action_arg_number_reset :
9642      action_arg == CA_ARG_NUMBER_MIN ? action_arg_number_min :
9643      action_arg == CA_ARG_NUMBER_MAX ? action_arg_number_max :
9644      action_arg == CA_ARG_NUMBER_RESET ? action_arg_number_reset :
9645      action_arg == CA_ARG_NUMBER_CE_VALUE ? CustomValue[x][y] :
9646      action_arg == CA_ARG_NUMBER_CE_SCORE ? ei->collect_score :
9647      action_arg == CA_ARG_NUMBER_CE_DELAY ? GET_CE_DELAY_VALUE(change) :
9648      action_arg == CA_ARG_NUMBER_LEVEL_TIME ? level_time_value :
9649      action_arg == CA_ARG_NUMBER_LEVEL_GEMS ? local_player->gems_still_needed :
9650      action_arg == CA_ARG_NUMBER_LEVEL_SCORE ? local_player->score :
9651      action_arg == CA_ARG_ELEMENT_CV_TARGET ? GET_NEW_CE_VALUE(target_element):
9652      action_arg == CA_ARG_ELEMENT_CV_TRIGGER ? change->actual_trigger_ce_value:
9653      action_arg == CA_ARG_ELEMENT_CV_ACTION ? GET_NEW_CE_VALUE(action_element):
9654      action_arg == CA_ARG_ELEMENT_CS_TARGET ? GET_CE_SCORE(target_element) :
9655      action_arg == CA_ARG_ELEMENT_CS_TRIGGER ? change->actual_trigger_ce_score:
9656      action_arg == CA_ARG_ELEMENT_CS_ACTION ? GET_CE_SCORE(action_element) :
9657      action_arg == CA_ARG_ELEMENT_NR_TARGET  ? change->target_element :
9658      action_arg == CA_ARG_ELEMENT_NR_TRIGGER ? change->actual_trigger_element :
9659      action_arg == CA_ARG_ELEMENT_NR_ACTION  ? change->action_element :
9660      -1);
9661
9662   int action_arg_number_old =
9663     (action_type == CA_SET_LEVEL_GEMS ? local_player->gems_still_needed :
9664      action_type == CA_SET_LEVEL_TIME ? TimeLeft :
9665      action_type == CA_SET_LEVEL_SCORE ? local_player->score :
9666      action_type == CA_SET_CE_VALUE ? CustomValue[x][y] :
9667      action_type == CA_SET_CE_SCORE ? ei->collect_score :
9668      0);
9669
9670   int action_arg_number_new =
9671     getModifiedActionNumber(action_arg_number_old,
9672                             action_mode, action_arg_number,
9673                             action_arg_number_min, action_arg_number_max);
9674
9675   int trigger_player_bits =
9676     (change->actual_trigger_player_bits != CH_PLAYER_NONE ?
9677      change->actual_trigger_player_bits : change->trigger_player);
9678
9679   int action_arg_player_bits =
9680     (action_arg >= CA_ARG_PLAYER_1 &&
9681      action_arg <= CA_ARG_PLAYER_4 ? action_arg - CA_ARG_PLAYER :
9682      action_arg == CA_ARG_PLAYER_TRIGGER ? trigger_player_bits :
9683      action_arg == CA_ARG_PLAYER_ACTION ? 1 << GET_PLAYER_NR(action_element) :
9684      PLAYER_BITS_ANY);
9685
9686   /* ---------- execute action  -------------------------------------------- */
9687
9688   switch (action_type)
9689   {
9690     case CA_NO_ACTION:
9691     {
9692       return;
9693     }
9694
9695     /* ---------- level actions  ------------------------------------------- */
9696
9697     case CA_RESTART_LEVEL:
9698     {
9699       game.restart_level = TRUE;
9700
9701       break;
9702     }
9703
9704     case CA_SHOW_ENVELOPE:
9705     {
9706       int element = getSpecialActionElement(action_arg_element,
9707                                             action_arg_number, EL_ENVELOPE_1);
9708
9709       if (IS_ENVELOPE(element))
9710         local_player->show_envelope = element;
9711
9712       break;
9713     }
9714
9715     case CA_SET_LEVEL_TIME:
9716     {
9717       if (level.time > 0)       /* only modify limited time value */
9718       {
9719         TimeLeft = action_arg_number_new;
9720
9721         game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
9722
9723         DisplayGameControlValues();
9724
9725         if (!TimeLeft && setup.time_limit)
9726           for (i = 0; i < MAX_PLAYERS; i++)
9727             KillPlayer(&stored_player[i]);
9728       }
9729
9730       break;
9731     }
9732
9733     case CA_SET_LEVEL_SCORE:
9734     {
9735       local_player->score = action_arg_number_new;
9736
9737       game_panel_controls[GAME_PANEL_SCORE].value = local_player->score;
9738
9739       DisplayGameControlValues();
9740
9741       break;
9742     }
9743
9744     case CA_SET_LEVEL_GEMS:
9745     {
9746       local_player->gems_still_needed = action_arg_number_new;
9747
9748       game.snapshot.collected_item = TRUE;
9749
9750       game_panel_controls[GAME_PANEL_GEMS].value =
9751         local_player->gems_still_needed;
9752
9753       DisplayGameControlValues();
9754
9755       break;
9756     }
9757
9758     case CA_SET_LEVEL_WIND:
9759     {
9760       game.wind_direction = action_arg_direction;
9761
9762       break;
9763     }
9764
9765     case CA_SET_LEVEL_RANDOM_SEED:
9766     {
9767       /* ensure that setting a new random seed while playing is predictable */
9768       InitRND(action_arg_number_new ? action_arg_number_new : RND(1000000) + 1);
9769
9770       break;
9771     }
9772
9773     /* ---------- player actions  ------------------------------------------ */
9774
9775     case CA_MOVE_PLAYER:
9776     {
9777       /* automatically move to the next field in specified direction */
9778       for (i = 0; i < MAX_PLAYERS; i++)
9779         if (trigger_player_bits & (1 << i))
9780           stored_player[i].programmed_action = action_arg_direction;
9781
9782       break;
9783     }
9784
9785     case CA_EXIT_PLAYER:
9786     {
9787       for (i = 0; i < MAX_PLAYERS; i++)
9788         if (action_arg_player_bits & (1 << i))
9789           ExitPlayer(&stored_player[i]);
9790
9791       if (AllPlayersGone)
9792         PlayerWins(local_player);
9793
9794       break;
9795     }
9796
9797     case CA_KILL_PLAYER:
9798     {
9799       for (i = 0; i < MAX_PLAYERS; i++)
9800         if (action_arg_player_bits & (1 << i))
9801           KillPlayer(&stored_player[i]);
9802
9803       break;
9804     }
9805
9806     case CA_SET_PLAYER_KEYS:
9807     {
9808       int key_state = (action_mode == CA_MODE_ADD ? TRUE : FALSE);
9809       int element = getSpecialActionElement(action_arg_element,
9810                                             action_arg_number, EL_KEY_1);
9811
9812       if (IS_KEY(element))
9813       {
9814         for (i = 0; i < MAX_PLAYERS; i++)
9815         {
9816           if (trigger_player_bits & (1 << i))
9817           {
9818             stored_player[i].key[KEY_NR(element)] = key_state;
9819
9820             DrawGameDoorValues();
9821           }
9822         }
9823       }
9824
9825       break;
9826     }
9827
9828     case CA_SET_PLAYER_SPEED:
9829     {
9830       for (i = 0; i < MAX_PLAYERS; i++)
9831       {
9832         if (trigger_player_bits & (1 << i))
9833         {
9834           int move_stepsize = TILEX / stored_player[i].move_delay_value;
9835
9836           if (action_arg == CA_ARG_SPEED_FASTER &&
9837               stored_player[i].cannot_move)
9838           {
9839             action_arg_number = STEPSIZE_VERY_SLOW;
9840           }
9841           else if (action_arg == CA_ARG_SPEED_SLOWER ||
9842                    action_arg == CA_ARG_SPEED_FASTER)
9843           {
9844             action_arg_number = 2;
9845             action_mode = (action_arg == CA_ARG_SPEED_SLOWER ? CA_MODE_DIVIDE :
9846                            CA_MODE_MULTIPLY);
9847           }
9848           else if (action_arg == CA_ARG_NUMBER_RESET)
9849           {
9850             action_arg_number = level.initial_player_stepsize[i];
9851           }
9852
9853           move_stepsize =
9854             getModifiedActionNumber(move_stepsize,
9855                                     action_mode,
9856                                     action_arg_number,
9857                                     action_arg_number_min,
9858                                     action_arg_number_max);
9859
9860           SetPlayerMoveSpeed(&stored_player[i], move_stepsize, FALSE);
9861         }
9862       }
9863
9864       break;
9865     }
9866
9867     case CA_SET_PLAYER_SHIELD:
9868     {
9869       for (i = 0; i < MAX_PLAYERS; i++)
9870       {
9871         if (trigger_player_bits & (1 << i))
9872         {
9873           if (action_arg == CA_ARG_SHIELD_OFF)
9874           {
9875             stored_player[i].shield_normal_time_left = 0;
9876             stored_player[i].shield_deadly_time_left = 0;
9877           }
9878           else if (action_arg == CA_ARG_SHIELD_NORMAL)
9879           {
9880             stored_player[i].shield_normal_time_left = 999999;
9881           }
9882           else if (action_arg == CA_ARG_SHIELD_DEADLY)
9883           {
9884             stored_player[i].shield_normal_time_left = 999999;
9885             stored_player[i].shield_deadly_time_left = 999999;
9886           }
9887         }
9888       }
9889
9890       break;
9891     }
9892
9893     case CA_SET_PLAYER_GRAVITY:
9894     {
9895       for (i = 0; i < MAX_PLAYERS; i++)
9896       {
9897         if (trigger_player_bits & (1 << i))
9898         {
9899           stored_player[i].gravity =
9900             (action_arg == CA_ARG_GRAVITY_OFF    ? FALSE                     :
9901              action_arg == CA_ARG_GRAVITY_ON     ? TRUE                      :
9902              action_arg == CA_ARG_GRAVITY_TOGGLE ? !stored_player[i].gravity :
9903              stored_player[i].gravity);
9904         }
9905       }
9906
9907       break;
9908     }
9909
9910     case CA_SET_PLAYER_ARTWORK:
9911     {
9912       for (i = 0; i < MAX_PLAYERS; i++)
9913       {
9914         if (trigger_player_bits & (1 << i))
9915         {
9916           int artwork_element = action_arg_element;
9917
9918           if (action_arg == CA_ARG_ELEMENT_RESET)
9919             artwork_element =
9920               (level.use_artwork_element[i] ? level.artwork_element[i] :
9921                stored_player[i].element_nr);
9922
9923           if (stored_player[i].artwork_element != artwork_element)
9924             stored_player[i].Frame = 0;
9925
9926           stored_player[i].artwork_element = artwork_element;
9927
9928           SetPlayerWaiting(&stored_player[i], FALSE);
9929
9930           /* set number of special actions for bored and sleeping animation */
9931           stored_player[i].num_special_action_bored =
9932             get_num_special_action(artwork_element,
9933                                    ACTION_BORING_1, ACTION_BORING_LAST);
9934           stored_player[i].num_special_action_sleeping =
9935             get_num_special_action(artwork_element,
9936                                    ACTION_SLEEPING_1, ACTION_SLEEPING_LAST);
9937         }
9938       }
9939
9940       break;
9941     }
9942
9943     case CA_SET_PLAYER_INVENTORY:
9944     {
9945       for (i = 0; i < MAX_PLAYERS; i++)
9946       {
9947         struct PlayerInfo *player = &stored_player[i];
9948         int j, k;
9949
9950         if (trigger_player_bits & (1 << i))
9951         {
9952           int inventory_element = action_arg_element;
9953
9954           if (action_arg == CA_ARG_ELEMENT_TARGET ||
9955               action_arg == CA_ARG_ELEMENT_TRIGGER ||
9956               action_arg == CA_ARG_ELEMENT_ACTION)
9957           {
9958             int element = inventory_element;
9959             int collect_count = element_info[element].collect_count_initial;
9960
9961             if (!IS_CUSTOM_ELEMENT(element))
9962               collect_count = 1;
9963
9964             if (collect_count == 0)
9965               player->inventory_infinite_element = element;
9966             else
9967               for (k = 0; k < collect_count; k++)
9968                 if (player->inventory_size < MAX_INVENTORY_SIZE)
9969                   player->inventory_element[player->inventory_size++] =
9970                     element;
9971           }
9972           else if (action_arg == CA_ARG_INVENTORY_RM_TARGET ||
9973                    action_arg == CA_ARG_INVENTORY_RM_TRIGGER ||
9974                    action_arg == CA_ARG_INVENTORY_RM_ACTION)
9975           {
9976             if (player->inventory_infinite_element != EL_UNDEFINED &&
9977                 IS_EQUAL_OR_IN_GROUP(player->inventory_infinite_element,
9978                                      action_arg_element_raw))
9979               player->inventory_infinite_element = EL_UNDEFINED;
9980
9981             for (k = 0, j = 0; j < player->inventory_size; j++)
9982             {
9983               if (!IS_EQUAL_OR_IN_GROUP(player->inventory_element[j],
9984                                         action_arg_element_raw))
9985                 player->inventory_element[k++] = player->inventory_element[j];
9986             }
9987
9988             player->inventory_size = k;
9989           }
9990           else if (action_arg == CA_ARG_INVENTORY_RM_FIRST)
9991           {
9992             if (player->inventory_size > 0)
9993             {
9994               for (j = 0; j < player->inventory_size - 1; j++)
9995                 player->inventory_element[j] = player->inventory_element[j + 1];
9996
9997               player->inventory_size--;
9998             }
9999           }
10000           else if (action_arg == CA_ARG_INVENTORY_RM_LAST)
10001           {
10002             if (player->inventory_size > 0)
10003               player->inventory_size--;
10004           }
10005           else if (action_arg == CA_ARG_INVENTORY_RM_ALL)
10006           {
10007             player->inventory_infinite_element = EL_UNDEFINED;
10008             player->inventory_size = 0;
10009           }
10010           else if (action_arg == CA_ARG_INVENTORY_RESET)
10011           {
10012             player->inventory_infinite_element = EL_UNDEFINED;
10013             player->inventory_size = 0;
10014
10015             if (level.use_initial_inventory[i])
10016             {
10017               for (j = 0; j < level.initial_inventory_size[i]; j++)
10018               {
10019                 int element = level.initial_inventory_content[i][j];
10020                 int collect_count = element_info[element].collect_count_initial;
10021
10022                 if (!IS_CUSTOM_ELEMENT(element))
10023                   collect_count = 1;
10024
10025                 if (collect_count == 0)
10026                   player->inventory_infinite_element = element;
10027                 else
10028                   for (k = 0; k < collect_count; k++)
10029                     if (player->inventory_size < MAX_INVENTORY_SIZE)
10030                       player->inventory_element[player->inventory_size++] =
10031                         element;
10032               }
10033             }
10034           }
10035         }
10036       }
10037
10038       break;
10039     }
10040
10041     /* ---------- CE actions  ---------------------------------------------- */
10042
10043     case CA_SET_CE_VALUE:
10044     {
10045       int last_ce_value = CustomValue[x][y];
10046
10047       CustomValue[x][y] = action_arg_number_new;
10048
10049       if (CustomValue[x][y] != last_ce_value)
10050       {
10051         CheckElementChange(x, y, element, EL_UNDEFINED, CE_VALUE_CHANGES);
10052         CheckTriggeredElementChange(x, y, element, CE_VALUE_CHANGES_OF_X);
10053
10054         if (CustomValue[x][y] == 0)
10055         {
10056           CheckElementChange(x, y, element, EL_UNDEFINED, CE_VALUE_GETS_ZERO);
10057           CheckTriggeredElementChange(x, y, element, CE_VALUE_GETS_ZERO_OF_X);
10058         }
10059       }
10060
10061       break;
10062     }
10063
10064     case CA_SET_CE_SCORE:
10065     {
10066       int last_ce_score = ei->collect_score;
10067
10068       ei->collect_score = action_arg_number_new;
10069
10070       if (ei->collect_score != last_ce_score)
10071       {
10072         CheckElementChange(x, y, element, EL_UNDEFINED, CE_SCORE_CHANGES);
10073         CheckTriggeredElementChange(x, y, element, CE_SCORE_CHANGES_OF_X);
10074
10075         if (ei->collect_score == 0)
10076         {
10077           int xx, yy;
10078
10079           CheckElementChange(x, y, element, EL_UNDEFINED, CE_SCORE_GETS_ZERO);
10080           CheckTriggeredElementChange(x, y, element, CE_SCORE_GETS_ZERO_OF_X);
10081
10082           /*
10083             This is a very special case that seems to be a mixture between
10084             CheckElementChange() and CheckTriggeredElementChange(): while
10085             the first one only affects single elements that are triggered
10086             directly, the second one affects multiple elements in the playfield
10087             that are triggered indirectly by another element. This is a third
10088             case: Changing the CE score always affects multiple identical CEs,
10089             so every affected CE must be checked, not only the single CE for
10090             which the CE score was changed in the first place (as every instance
10091             of that CE shares the same CE score, and therefore also can change)!
10092           */
10093           SCAN_PLAYFIELD(xx, yy)
10094           {
10095             if (Feld[xx][yy] == element)
10096               CheckElementChange(xx, yy, element, EL_UNDEFINED,
10097                                  CE_SCORE_GETS_ZERO);
10098           }
10099         }
10100       }
10101
10102       break;
10103     }
10104
10105     case CA_SET_CE_ARTWORK:
10106     {
10107       int artwork_element = action_arg_element;
10108       boolean reset_frame = FALSE;
10109       int xx, yy;
10110
10111       if (action_arg == CA_ARG_ELEMENT_RESET)
10112         artwork_element = (ei->use_gfx_element ? ei->gfx_element_initial :
10113                            element);
10114
10115       if (ei->gfx_element != artwork_element)
10116         reset_frame = TRUE;
10117
10118       ei->gfx_element = artwork_element;
10119
10120       SCAN_PLAYFIELD(xx, yy)
10121       {
10122         if (Feld[xx][yy] == element)
10123         {
10124           if (reset_frame)
10125           {
10126             ResetGfxAnimation(xx, yy);
10127             ResetRandomAnimationValue(xx, yy);
10128           }
10129
10130           TEST_DrawLevelField(xx, yy);
10131         }
10132       }
10133
10134       break;
10135     }
10136
10137     /* ---------- engine actions  ------------------------------------------ */
10138
10139     case CA_SET_ENGINE_SCAN_MODE:
10140     {
10141       InitPlayfieldScanMode(action_arg);
10142
10143       break;
10144     }
10145
10146     default:
10147       break;
10148   }
10149 }
10150
10151 static void CreateFieldExt(int x, int y, int element, boolean is_change)
10152 {
10153   int old_element = Feld[x][y];
10154   int new_element = GetElementFromGroupElement(element);
10155   int previous_move_direction = MovDir[x][y];
10156   int last_ce_value = CustomValue[x][y];
10157   boolean player_explosion_protected = PLAYER_EXPLOSION_PROTECTED(x, y);
10158   boolean new_element_is_player = ELEM_IS_PLAYER(new_element);
10159   boolean add_player_onto_element = (new_element_is_player &&
10160                                      new_element != EL_SOKOBAN_FIELD_PLAYER &&
10161                                      IS_WALKABLE(old_element));
10162
10163   if (!add_player_onto_element)
10164   {
10165     if (IS_MOVING(x, y) || IS_BLOCKED(x, y))
10166       RemoveMovingField(x, y);
10167     else
10168       RemoveField(x, y);
10169
10170     Feld[x][y] = new_element;
10171
10172     if (element_info[new_element].move_direction_initial == MV_START_PREVIOUS)
10173       MovDir[x][y] = previous_move_direction;
10174
10175     if (element_info[new_element].use_last_ce_value)
10176       CustomValue[x][y] = last_ce_value;
10177
10178     InitField_WithBug1(x, y, FALSE);
10179
10180     new_element = Feld[x][y];   /* element may have changed */
10181
10182     ResetGfxAnimation(x, y);
10183     ResetRandomAnimationValue(x, y);
10184
10185     TEST_DrawLevelField(x, y);
10186
10187     if (GFX_CRUMBLED(new_element))
10188       TEST_DrawLevelFieldCrumbledNeighbours(x, y);
10189   }
10190
10191   /* check if element under the player changes from accessible to unaccessible
10192      (needed for special case of dropping element which then changes) */
10193   /* (must be checked after creating new element for walkable group elements) */
10194   if (IS_PLAYER(x, y) && !player_explosion_protected &&
10195       IS_ACCESSIBLE(old_element) && !IS_ACCESSIBLE(new_element))
10196   {
10197     Bang(x, y);
10198
10199     return;
10200   }
10201
10202   /* "ChangeCount" not set yet to allow "entered by player" change one time */
10203   if (new_element_is_player)
10204     RelocatePlayer(x, y, new_element);
10205
10206   if (is_change)
10207     ChangeCount[x][y]++;        /* count number of changes in the same frame */
10208
10209   TestIfBadThingTouchesPlayer(x, y);
10210   TestIfPlayerTouchesCustomElement(x, y);
10211   TestIfElementTouchesCustomElement(x, y);
10212 }
10213
10214 static void CreateField(int x, int y, int element)
10215 {
10216   CreateFieldExt(x, y, element, FALSE);
10217 }
10218
10219 static void CreateElementFromChange(int x, int y, int element)
10220 {
10221   element = GET_VALID_RUNTIME_ELEMENT(element);
10222
10223   if (game.engine_version >= VERSION_IDENT(3,2,0,7))
10224   {
10225     int old_element = Feld[x][y];
10226
10227     /* prevent changed element from moving in same engine frame
10228        unless both old and new element can either fall or move */
10229     if ((!CAN_FALL(old_element) || !CAN_FALL(element)) &&
10230         (!CAN_MOVE(old_element) || !CAN_MOVE(element)))
10231       Stop[x][y] = TRUE;
10232   }
10233
10234   CreateFieldExt(x, y, element, TRUE);
10235 }
10236
10237 static boolean ChangeElement(int x, int y, int element, int page)
10238 {
10239   struct ElementInfo *ei = &element_info[element];
10240   struct ElementChangeInfo *change = &ei->change_page[page];
10241   int ce_value = CustomValue[x][y];
10242   int ce_score = ei->collect_score;
10243   int target_element;
10244   int old_element = Feld[x][y];
10245
10246   /* always use default change event to prevent running into a loop */
10247   if (ChangeEvent[x][y] == -1)
10248     ChangeEvent[x][y] = CE_DELAY;
10249
10250   if (ChangeEvent[x][y] == CE_DELAY)
10251   {
10252     /* reset actual trigger element, trigger player and action element */
10253     change->actual_trigger_element = EL_EMPTY;
10254     change->actual_trigger_player = EL_EMPTY;
10255     change->actual_trigger_player_bits = CH_PLAYER_NONE;
10256     change->actual_trigger_side = CH_SIDE_NONE;
10257     change->actual_trigger_ce_value = 0;
10258     change->actual_trigger_ce_score = 0;
10259   }
10260
10261   /* do not change elements more than a specified maximum number of changes */
10262   if (ChangeCount[x][y] >= game.max_num_changes_per_frame)
10263     return FALSE;
10264
10265   ChangeCount[x][y]++;          /* count number of changes in the same frame */
10266
10267   if (change->explode)
10268   {
10269     Bang(x, y);
10270
10271     return TRUE;
10272   }
10273
10274   if (change->use_target_content)
10275   {
10276     boolean complete_replace = TRUE;
10277     boolean can_replace[3][3];
10278     int xx, yy;
10279
10280     for (yy = 0; yy < 3; yy++) for (xx = 0; xx < 3 ; xx++)
10281     {
10282       boolean is_empty;
10283       boolean is_walkable;
10284       boolean is_diggable;
10285       boolean is_collectible;
10286       boolean is_removable;
10287       boolean is_destructible;
10288       int ex = x + xx - 1;
10289       int ey = y + yy - 1;
10290       int content_element = change->target_content.e[xx][yy];
10291       int e;
10292
10293       can_replace[xx][yy] = TRUE;
10294
10295       if (ex == x && ey == y)   /* do not check changing element itself */
10296         continue;
10297
10298       if (content_element == EL_EMPTY_SPACE)
10299       {
10300         can_replace[xx][yy] = FALSE;    /* do not replace border with space */
10301
10302         continue;
10303       }
10304
10305       if (!IN_LEV_FIELD(ex, ey))
10306       {
10307         can_replace[xx][yy] = FALSE;
10308         complete_replace = FALSE;
10309
10310         continue;
10311       }
10312
10313       e = Feld[ex][ey];
10314
10315       if (IS_MOVING(ex, ey) || IS_BLOCKED(ex, ey))
10316         e = MovingOrBlocked2Element(ex, ey);
10317
10318       is_empty = (IS_FREE(ex, ey) ||
10319                   (IS_FREE_OR_PLAYER(ex, ey) && IS_WALKABLE(content_element)));
10320
10321       is_walkable     = (is_empty || IS_WALKABLE(e));
10322       is_diggable     = (is_empty || IS_DIGGABLE(e));
10323       is_collectible  = (is_empty || IS_COLLECTIBLE(e));
10324       is_destructible = (is_empty || !IS_INDESTRUCTIBLE(e));
10325       is_removable    = (is_diggable || is_collectible);
10326
10327       can_replace[xx][yy] =
10328         (((change->replace_when == CP_WHEN_EMPTY        && is_empty) ||
10329           (change->replace_when == CP_WHEN_WALKABLE     && is_walkable) ||
10330           (change->replace_when == CP_WHEN_DIGGABLE     && is_diggable) ||
10331           (change->replace_when == CP_WHEN_COLLECTIBLE  && is_collectible) ||
10332           (change->replace_when == CP_WHEN_REMOVABLE    && is_removable) ||
10333           (change->replace_when == CP_WHEN_DESTRUCTIBLE && is_destructible)) &&
10334          !(IS_PLAYER(ex, ey) && ELEM_IS_PLAYER(content_element)));
10335
10336       if (!can_replace[xx][yy])
10337         complete_replace = FALSE;
10338     }
10339
10340     if (!change->only_if_complete || complete_replace)
10341     {
10342       boolean something_has_changed = FALSE;
10343
10344       if (change->only_if_complete && change->use_random_replace &&
10345           RND(100) < change->random_percentage)
10346         return FALSE;
10347
10348       for (yy = 0; yy < 3; yy++) for (xx = 0; xx < 3 ; xx++)
10349       {
10350         int ex = x + xx - 1;
10351         int ey = y + yy - 1;
10352         int content_element;
10353
10354         if (can_replace[xx][yy] && (!change->use_random_replace ||
10355                                     RND(100) < change->random_percentage))
10356         {
10357           if (IS_MOVING(ex, ey) || IS_BLOCKED(ex, ey))
10358             RemoveMovingField(ex, ey);
10359
10360           ChangeEvent[ex][ey] = ChangeEvent[x][y];
10361
10362           content_element = change->target_content.e[xx][yy];
10363           target_element = GET_TARGET_ELEMENT(element, content_element, change,
10364                                               ce_value, ce_score);
10365
10366           CreateElementFromChange(ex, ey, target_element);
10367
10368           something_has_changed = TRUE;
10369
10370           /* for symmetry reasons, freeze newly created border elements */
10371           if (ex != x || ey != y)
10372             Stop[ex][ey] = TRUE;        /* no more moving in this frame */
10373         }
10374       }
10375
10376       if (something_has_changed)
10377       {
10378         PlayLevelSoundElementAction(x, y, element, ACTION_CHANGING);
10379         PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + page);
10380       }
10381     }
10382   }
10383   else
10384   {
10385     target_element = GET_TARGET_ELEMENT(element, change->target_element, change,
10386                                         ce_value, ce_score);
10387
10388     if (element == EL_DIAGONAL_GROWING ||
10389         element == EL_DIAGONAL_SHRINKING)
10390     {
10391       target_element = Store[x][y];
10392
10393       Store[x][y] = EL_EMPTY;
10394     }
10395
10396     CreateElementFromChange(x, y, target_element);
10397
10398     PlayLevelSoundElementAction(x, y, element, ACTION_CHANGING);
10399     PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + page);
10400   }
10401
10402   /* this uses direct change before indirect change */
10403   CheckTriggeredElementChangeByPage(x, y, old_element, CE_CHANGE_OF_X, page);
10404
10405   return TRUE;
10406 }
10407
10408 static void HandleElementChange(int x, int y, int page)
10409 {
10410   int element = MovingOrBlocked2Element(x, y);
10411   struct ElementInfo *ei = &element_info[element];
10412   struct ElementChangeInfo *change = &ei->change_page[page];
10413   boolean handle_action_before_change = FALSE;
10414
10415 #ifdef DEBUG
10416   if (!CAN_CHANGE_OR_HAS_ACTION(element) &&
10417       !CAN_CHANGE_OR_HAS_ACTION(Back[x][y]))
10418   {
10419     printf("\n\n");
10420     printf("HandleElementChange(): %d,%d: element = %d ('%s')\n",
10421            x, y, element, element_info[element].token_name);
10422     printf("HandleElementChange(): This should never happen!\n");
10423     printf("\n\n");
10424   }
10425 #endif
10426
10427   /* this can happen with classic bombs on walkable, changing elements */
10428   if (!CAN_CHANGE_OR_HAS_ACTION(element))
10429   {
10430     return;
10431   }
10432
10433   if (ChangeDelay[x][y] == 0)           /* initialize element change */
10434   {
10435     ChangeDelay[x][y] = GET_CHANGE_DELAY(change) + 1;
10436
10437     if (change->can_change)
10438     {
10439       /* !!! not clear why graphic animation should be reset at all here !!! */
10440       /* !!! UPDATE: but is needed for correct Snake Bite tail animation !!! */
10441       /* !!! SOLUTION: do not reset if graphics engine set to 4 or above !!! */
10442
10443       /*
10444         GRAPHICAL BUG ADDRESSED BY CHECKING GRAPHICS ENGINE VERSION:
10445
10446         When using an animation frame delay of 1 (this only happens with
10447         "sp_zonk.moving.left/right" in the classic graphics), the default
10448         (non-moving) animation shows wrong animation frames (while the
10449         moving animation, like "sp_zonk.moving.left/right", is correct,
10450         so this graphical bug never shows up with the classic graphics).
10451         For an animation with 4 frames, this causes wrong frames 0,0,1,2
10452         be drawn instead of the correct frames 0,1,2,3. This is caused by
10453         "GfxFrame[][]" being reset *twice* (in two successive frames) after
10454         an element change: First when the change delay ("ChangeDelay[][]")
10455         counter has reached zero after decrementing, then a second time in
10456         the next frame (after "GfxFrame[][]" was already incremented) when
10457         "ChangeDelay[][]" is reset to the initial delay value again.
10458
10459         This causes frame 0 to be drawn twice, while the last frame won't
10460         be drawn anymore, resulting in the wrong frame sequence 0,0,1,2.
10461
10462         As some animations may already be cleverly designed around this bug
10463         (at least the "Snake Bite" snake tail animation does this), it cannot
10464         simply be fixed here without breaking such existing animations.
10465         Unfortunately, it cannot easily be detected if a graphics set was
10466         designed "before" or "after" the bug was fixed. As a workaround,
10467         a new graphics set option "game.graphics_engine_version" was added
10468         to be able to specify the game's major release version for which the
10469         graphics set was designed, which can then be used to decide if the
10470         bugfix should be used (version 4 and above) or not (version 3 or
10471         below, or if no version was specified at all, as with old sets).
10472
10473         (The wrong/fixed animation frames can be tested with the test level set
10474         "test_gfxframe" and level "000", which contains a specially prepared
10475         custom element at level position (x/y) == (11/9) which uses the zonk
10476         animation mentioned above. Using "game.graphics_engine_version: 4"
10477         fixes the wrong animation frames, showing the correct frames 0,1,2,3.
10478         This can also be seen from the debug output for this test element.)
10479       */
10480
10481       /* when a custom element is about to change (for example by change delay),
10482          do not reset graphic animation when the custom element is moving */
10483       if (game.graphics_engine_version < 4 &&
10484           !IS_MOVING(x, y))
10485       {
10486         ResetGfxAnimation(x, y);
10487         ResetRandomAnimationValue(x, y);
10488       }
10489
10490       if (change->pre_change_function)
10491         change->pre_change_function(x, y);
10492     }
10493   }
10494
10495   ChangeDelay[x][y]--;
10496
10497   if (ChangeDelay[x][y] != 0)           /* continue element change */
10498   {
10499     if (change->can_change)
10500     {
10501       int graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
10502
10503       if (IS_ANIMATED(graphic))
10504         DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
10505
10506       if (change->change_function)
10507         change->change_function(x, y);
10508     }
10509   }
10510   else                                  /* finish element change */
10511   {
10512     if (ChangePage[x][y] != -1)         /* remember page from delayed change */
10513     {
10514       page = ChangePage[x][y];
10515       ChangePage[x][y] = -1;
10516
10517       change = &ei->change_page[page];
10518     }
10519
10520     if (IS_MOVING(x, y))                /* never change a running system ;-) */
10521     {
10522       ChangeDelay[x][y] = 1;            /* try change after next move step */
10523       ChangePage[x][y] = page;          /* remember page to use for change */
10524
10525       return;
10526     }
10527
10528     /* special case: set new level random seed before changing element */
10529     if (change->has_action && change->action_type == CA_SET_LEVEL_RANDOM_SEED)
10530       handle_action_before_change = TRUE;
10531
10532     if (change->has_action && handle_action_before_change)
10533       ExecuteCustomElementAction(x, y, element, page);
10534
10535     if (change->can_change)
10536     {
10537       if (ChangeElement(x, y, element, page))
10538       {
10539         if (change->post_change_function)
10540           change->post_change_function(x, y);
10541       }
10542     }
10543
10544     if (change->has_action && !handle_action_before_change)
10545       ExecuteCustomElementAction(x, y, element, page);
10546   }
10547 }
10548
10549 static boolean CheckTriggeredElementChangeExt(int trigger_x, int trigger_y,
10550                                               int trigger_element,
10551                                               int trigger_event,
10552                                               int trigger_player,
10553                                               int trigger_side,
10554                                               int trigger_page)
10555 {
10556   boolean change_done_any = FALSE;
10557   int trigger_page_bits = (trigger_page < 0 ? CH_PAGE_ANY : 1 << trigger_page);
10558   int i;
10559
10560   if (!(trigger_events[trigger_element][trigger_event]))
10561     return FALSE;
10562
10563   RECURSION_LOOP_DETECTION_START(trigger_element, FALSE);
10564
10565   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
10566   {
10567     int element = EL_CUSTOM_START + i;
10568     boolean change_done = FALSE;
10569     int p;
10570
10571     if (!CAN_CHANGE_OR_HAS_ACTION(element) ||
10572         !HAS_ANY_CHANGE_EVENT(element, trigger_event))
10573       continue;
10574
10575     for (p = 0; p < element_info[element].num_change_pages; p++)
10576     {
10577       struct ElementChangeInfo *change = &element_info[element].change_page[p];
10578
10579       if (change->can_change_or_has_action &&
10580           change->has_event[trigger_event] &&
10581           change->trigger_side & trigger_side &&
10582           change->trigger_player & trigger_player &&
10583           change->trigger_page & trigger_page_bits &&
10584           IS_EQUAL_OR_IN_GROUP(trigger_element, change->trigger_element))
10585       {
10586         change->actual_trigger_element = trigger_element;
10587         change->actual_trigger_player = GET_PLAYER_FROM_BITS(trigger_player);
10588         change->actual_trigger_player_bits = trigger_player;
10589         change->actual_trigger_side = trigger_side;
10590         change->actual_trigger_ce_value = CustomValue[trigger_x][trigger_y];
10591         change->actual_trigger_ce_score = GET_CE_SCORE(trigger_element);
10592
10593         if ((change->can_change && !change_done) || change->has_action)
10594         {
10595           int x, y;
10596
10597           SCAN_PLAYFIELD(x, y)
10598           {
10599             if (Feld[x][y] == element)
10600             {
10601               if (change->can_change && !change_done)
10602               {
10603                 /* if element already changed in this frame, not only prevent
10604                    another element change (checked in ChangeElement()), but
10605                    also prevent additional element actions for this element */
10606
10607                 if (ChangeCount[x][y] >= game.max_num_changes_per_frame &&
10608                     !level.use_action_after_change_bug)
10609                   continue;
10610
10611                 ChangeDelay[x][y] = 1;
10612                 ChangeEvent[x][y] = trigger_event;
10613
10614                 HandleElementChange(x, y, p);
10615               }
10616               else if (change->has_action)
10617               {
10618                 /* if element already changed in this frame, not only prevent
10619                    another element change (checked in ChangeElement()), but
10620                    also prevent additional element actions for this element */
10621
10622                 if (ChangeCount[x][y] >= game.max_num_changes_per_frame &&
10623                     !level.use_action_after_change_bug)
10624                   continue;
10625
10626                 ExecuteCustomElementAction(x, y, element, p);
10627                 PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + p);
10628               }
10629             }
10630           }
10631
10632           if (change->can_change)
10633           {
10634             change_done = TRUE;
10635             change_done_any = TRUE;
10636           }
10637         }
10638       }
10639     }
10640   }
10641
10642   RECURSION_LOOP_DETECTION_END();
10643
10644   return change_done_any;
10645 }
10646
10647 static boolean CheckElementChangeExt(int x, int y,
10648                                      int element,
10649                                      int trigger_element,
10650                                      int trigger_event,
10651                                      int trigger_player,
10652                                      int trigger_side)
10653 {
10654   boolean change_done = FALSE;
10655   int p;
10656
10657   if (!CAN_CHANGE_OR_HAS_ACTION(element) ||
10658       !HAS_ANY_CHANGE_EVENT(element, trigger_event))
10659     return FALSE;
10660
10661   if (Feld[x][y] == EL_BLOCKED)
10662   {
10663     Blocked2Moving(x, y, &x, &y);
10664     element = Feld[x][y];
10665   }
10666
10667   /* check if element has already changed or is about to change after moving */
10668   if ((game.engine_version < VERSION_IDENT(3,2,0,7) &&
10669        Feld[x][y] != element) ||
10670
10671       (game.engine_version >= VERSION_IDENT(3,2,0,7) &&
10672        (ChangeCount[x][y] >= game.max_num_changes_per_frame ||
10673         ChangePage[x][y] != -1)))
10674     return FALSE;
10675
10676   RECURSION_LOOP_DETECTION_START(trigger_element, FALSE);
10677
10678   for (p = 0; p < element_info[element].num_change_pages; p++)
10679   {
10680     struct ElementChangeInfo *change = &element_info[element].change_page[p];
10681
10682     /* check trigger element for all events where the element that is checked
10683        for changing interacts with a directly adjacent element -- this is
10684        different to element changes that affect other elements to change on the
10685        whole playfield (which is handeld by CheckTriggeredElementChangeExt()) */
10686     boolean check_trigger_element =
10687       (trigger_event == CE_TOUCHING_X ||
10688        trigger_event == CE_HITTING_X ||
10689        trigger_event == CE_HIT_BY_X ||
10690        trigger_event == CE_DIGGING_X); /* this one was forgotten until 3.2.3 */
10691
10692     if (change->can_change_or_has_action &&
10693         change->has_event[trigger_event] &&
10694         change->trigger_side & trigger_side &&
10695         change->trigger_player & trigger_player &&
10696         (!check_trigger_element ||
10697          IS_EQUAL_OR_IN_GROUP(trigger_element, change->trigger_element)))
10698     {
10699       change->actual_trigger_element = trigger_element;
10700       change->actual_trigger_player = GET_PLAYER_FROM_BITS(trigger_player);
10701       change->actual_trigger_player_bits = trigger_player;
10702       change->actual_trigger_side = trigger_side;
10703       change->actual_trigger_ce_value = CustomValue[x][y];
10704       change->actual_trigger_ce_score = GET_CE_SCORE(trigger_element);
10705
10706       /* special case: trigger element not at (x,y) position for some events */
10707       if (check_trigger_element)
10708       {
10709         static struct
10710         {
10711           int dx, dy;
10712         } move_xy[] =
10713           {
10714             {  0,  0 },
10715             { -1,  0 },
10716             { +1,  0 },
10717             {  0,  0 },
10718             {  0, -1 },
10719             {  0,  0 }, { 0, 0 }, { 0, 0 },
10720             {  0, +1 }
10721           };
10722
10723         int xx = x + move_xy[MV_DIR_OPPOSITE(trigger_side)].dx;
10724         int yy = y + move_xy[MV_DIR_OPPOSITE(trigger_side)].dy;
10725
10726         change->actual_trigger_ce_value = CustomValue[xx][yy];
10727         change->actual_trigger_ce_score = GET_CE_SCORE(trigger_element);
10728       }
10729
10730       if (change->can_change && !change_done)
10731       {
10732         ChangeDelay[x][y] = 1;
10733         ChangeEvent[x][y] = trigger_event;
10734
10735         HandleElementChange(x, y, p);
10736
10737         change_done = TRUE;
10738       }
10739       else if (change->has_action)
10740       {
10741         ExecuteCustomElementAction(x, y, element, p);
10742         PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + p);
10743       }
10744     }
10745   }
10746
10747   RECURSION_LOOP_DETECTION_END();
10748
10749   return change_done;
10750 }
10751
10752 static void PlayPlayerSound(struct PlayerInfo *player)
10753 {
10754   int jx = player->jx, jy = player->jy;
10755   int sound_element = player->artwork_element;
10756   int last_action = player->last_action_waiting;
10757   int action = player->action_waiting;
10758
10759   if (player->is_waiting)
10760   {
10761     if (action != last_action)
10762       PlayLevelSoundElementAction(jx, jy, sound_element, action);
10763     else
10764       PlayLevelSoundElementActionIfLoop(jx, jy, sound_element, action);
10765   }
10766   else
10767   {
10768     if (action != last_action)
10769       StopSound(element_info[sound_element].sound[last_action]);
10770
10771     if (last_action == ACTION_SLEEPING)
10772       PlayLevelSoundElementAction(jx, jy, sound_element, ACTION_AWAKENING);
10773   }
10774 }
10775
10776 static void PlayAllPlayersSound()
10777 {
10778   int i;
10779
10780   for (i = 0; i < MAX_PLAYERS; i++)
10781     if (stored_player[i].active)
10782       PlayPlayerSound(&stored_player[i]);
10783 }
10784
10785 static void SetPlayerWaiting(struct PlayerInfo *player, boolean is_waiting)
10786 {
10787   boolean last_waiting = player->is_waiting;
10788   int move_dir = player->MovDir;
10789
10790   player->dir_waiting = move_dir;
10791   player->last_action_waiting = player->action_waiting;
10792
10793   if (is_waiting)
10794   {
10795     if (!last_waiting)          /* not waiting -> waiting */
10796     {
10797       player->is_waiting = TRUE;
10798
10799       player->frame_counter_bored =
10800         FrameCounter +
10801         game.player_boring_delay_fixed +
10802         GetSimpleRandom(game.player_boring_delay_random);
10803       player->frame_counter_sleeping =
10804         FrameCounter +
10805         game.player_sleeping_delay_fixed +
10806         GetSimpleRandom(game.player_sleeping_delay_random);
10807
10808       InitPlayerGfxAnimation(player, ACTION_WAITING, move_dir);
10809     }
10810
10811     if (game.player_sleeping_delay_fixed +
10812         game.player_sleeping_delay_random > 0 &&
10813         player->anim_delay_counter == 0 &&
10814         player->post_delay_counter == 0 &&
10815         FrameCounter >= player->frame_counter_sleeping)
10816       player->is_sleeping = TRUE;
10817     else if (game.player_boring_delay_fixed +
10818              game.player_boring_delay_random > 0 &&
10819              FrameCounter >= player->frame_counter_bored)
10820       player->is_bored = TRUE;
10821
10822     player->action_waiting = (player->is_sleeping ? ACTION_SLEEPING :
10823                               player->is_bored ? ACTION_BORING :
10824                               ACTION_WAITING);
10825
10826     if (player->is_sleeping && player->use_murphy)
10827     {
10828       /* special case for sleeping Murphy when leaning against non-free tile */
10829
10830       if (!IN_LEV_FIELD(player->jx - 1, player->jy) ||
10831           (Feld[player->jx - 1][player->jy] != EL_EMPTY &&
10832            !IS_MOVING(player->jx - 1, player->jy)))
10833         move_dir = MV_LEFT;
10834       else if (!IN_LEV_FIELD(player->jx + 1, player->jy) ||
10835                (Feld[player->jx + 1][player->jy] != EL_EMPTY &&
10836                 !IS_MOVING(player->jx + 1, player->jy)))
10837         move_dir = MV_RIGHT;
10838       else
10839         player->is_sleeping = FALSE;
10840
10841       player->dir_waiting = move_dir;
10842     }
10843
10844     if (player->is_sleeping)
10845     {
10846       if (player->num_special_action_sleeping > 0)
10847       {
10848         if (player->anim_delay_counter == 0 && player->post_delay_counter == 0)
10849         {
10850           int last_special_action = player->special_action_sleeping;
10851           int num_special_action = player->num_special_action_sleeping;
10852           int special_action =
10853             (last_special_action == ACTION_DEFAULT ? ACTION_SLEEPING_1 :
10854              last_special_action == ACTION_SLEEPING ? ACTION_SLEEPING :
10855              last_special_action < ACTION_SLEEPING_1 + num_special_action - 1 ?
10856              last_special_action + 1 : ACTION_SLEEPING);
10857           int special_graphic =
10858             el_act_dir2img(player->artwork_element, special_action, move_dir);
10859
10860           player->anim_delay_counter =
10861             graphic_info[special_graphic].anim_delay_fixed +
10862             GetSimpleRandom(graphic_info[special_graphic].anim_delay_random);
10863           player->post_delay_counter =
10864             graphic_info[special_graphic].post_delay_fixed +
10865             GetSimpleRandom(graphic_info[special_graphic].post_delay_random);
10866
10867           player->special_action_sleeping = special_action;
10868         }
10869
10870         if (player->anim_delay_counter > 0)
10871         {
10872           player->action_waiting = player->special_action_sleeping;
10873           player->anim_delay_counter--;
10874         }
10875         else if (player->post_delay_counter > 0)
10876         {
10877           player->post_delay_counter--;
10878         }
10879       }
10880     }
10881     else if (player->is_bored)
10882     {
10883       if (player->num_special_action_bored > 0)
10884       {
10885         if (player->anim_delay_counter == 0 && player->post_delay_counter == 0)
10886         {
10887           int special_action =
10888             ACTION_BORING_1 + GetSimpleRandom(player->num_special_action_bored);
10889           int special_graphic =
10890             el_act_dir2img(player->artwork_element, special_action, move_dir);
10891
10892           player->anim_delay_counter =
10893             graphic_info[special_graphic].anim_delay_fixed +
10894             GetSimpleRandom(graphic_info[special_graphic].anim_delay_random);
10895           player->post_delay_counter =
10896             graphic_info[special_graphic].post_delay_fixed +
10897             GetSimpleRandom(graphic_info[special_graphic].post_delay_random);
10898
10899           player->special_action_bored = special_action;
10900         }
10901
10902         if (player->anim_delay_counter > 0)
10903         {
10904           player->action_waiting = player->special_action_bored;
10905           player->anim_delay_counter--;
10906         }
10907         else if (player->post_delay_counter > 0)
10908         {
10909           player->post_delay_counter--;
10910         }
10911       }
10912     }
10913   }
10914   else if (last_waiting)        /* waiting -> not waiting */
10915   {
10916     player->is_waiting = FALSE;
10917     player->is_bored = FALSE;
10918     player->is_sleeping = FALSE;
10919
10920     player->frame_counter_bored = -1;
10921     player->frame_counter_sleeping = -1;
10922
10923     player->anim_delay_counter = 0;
10924     player->post_delay_counter = 0;
10925
10926     player->dir_waiting = player->MovDir;
10927     player->action_waiting = ACTION_DEFAULT;
10928
10929     player->special_action_bored = ACTION_DEFAULT;
10930     player->special_action_sleeping = ACTION_DEFAULT;
10931   }
10932 }
10933
10934 static void CheckSaveEngineSnapshot(struct PlayerInfo *player)
10935 {
10936   if ((!player->is_moving  && player->was_moving) ||
10937       (player->MovPos == 0 && player->was_moving) ||
10938       (player->is_snapping && !player->was_snapping) ||
10939       (player->is_dropping && !player->was_dropping))
10940   {
10941     if (!CheckSaveEngineSnapshotToList())
10942       return;
10943
10944     player->was_moving = FALSE;
10945     player->was_snapping = TRUE;
10946     player->was_dropping = TRUE;
10947   }
10948   else
10949   {
10950     if (player->is_moving)
10951       player->was_moving = TRUE;
10952
10953     if (!player->is_snapping)
10954       player->was_snapping = FALSE;
10955
10956     if (!player->is_dropping)
10957       player->was_dropping = FALSE;
10958   }
10959 }
10960
10961 static void CheckSingleStepMode(struct PlayerInfo *player)
10962 {
10963   if (tape.single_step && tape.recording && !tape.pausing)
10964   {
10965     /* as it is called "single step mode", just return to pause mode when the
10966        player stopped moving after one tile (or never starts moving at all) */
10967     if (!player->is_moving &&
10968         !player->is_pushing &&
10969         !player->is_dropping_pressed)
10970     {
10971       TapeTogglePause(TAPE_TOGGLE_AUTOMATIC);
10972       SnapField(player, 0, 0);                  /* stop snapping */
10973     }
10974   }
10975
10976   CheckSaveEngineSnapshot(player);
10977 }
10978
10979 static byte PlayerActions(struct PlayerInfo *player, byte player_action)
10980 {
10981   int left      = player_action & JOY_LEFT;
10982   int right     = player_action & JOY_RIGHT;
10983   int up        = player_action & JOY_UP;
10984   int down      = player_action & JOY_DOWN;
10985   int button1   = player_action & JOY_BUTTON_1;
10986   int button2   = player_action & JOY_BUTTON_2;
10987   int dx        = (left ? -1 : right ? 1 : 0);
10988   int dy        = (up   ? -1 : down  ? 1 : 0);
10989
10990   if (!player->active || tape.pausing)
10991     return 0;
10992
10993   if (player_action)
10994   {
10995     if (button1)
10996       SnapField(player, dx, dy);
10997     else
10998     {
10999       if (button2)
11000         DropElement(player);
11001
11002       MovePlayer(player, dx, dy);
11003     }
11004
11005     CheckSingleStepMode(player);
11006
11007     SetPlayerWaiting(player, FALSE);
11008
11009     return player_action;
11010   }
11011   else
11012   {
11013     /* no actions for this player (no input at player's configured device) */
11014
11015     DigField(player, 0, 0, 0, 0, 0, 0, DF_NO_PUSH);
11016     SnapField(player, 0, 0);
11017     CheckGravityMovementWhenNotMoving(player);
11018
11019     if (player->MovPos == 0)
11020       SetPlayerWaiting(player, TRUE);
11021
11022     if (player->MovPos == 0)    /* needed for tape.playing */
11023       player->is_moving = FALSE;
11024
11025     player->is_dropping = FALSE;
11026     player->is_dropping_pressed = FALSE;
11027     player->drop_pressed_delay = 0;
11028
11029     CheckSingleStepMode(player);
11030
11031     return 0;
11032   }
11033 }
11034
11035 static void SetMouseActionFromTapeAction(struct MouseActionInfo *mouse_action,
11036                                          byte *tape_action)
11037 {
11038   if (!tape.use_mouse)
11039     return;
11040
11041   mouse_action->lx     = tape_action[TAPE_ACTION_LX];
11042   mouse_action->ly     = tape_action[TAPE_ACTION_LY];
11043   mouse_action->button = tape_action[TAPE_ACTION_BUTTON];
11044 }
11045
11046 static void SetTapeActionFromMouseAction(byte *tape_action,
11047                                          struct MouseActionInfo *mouse_action)
11048 {
11049   if (!tape.use_mouse)
11050     return;
11051
11052   tape_action[TAPE_ACTION_LX]     = mouse_action->lx;
11053   tape_action[TAPE_ACTION_LY]     = mouse_action->ly;
11054   tape_action[TAPE_ACTION_BUTTON] = mouse_action->button;
11055 }
11056
11057 static void CheckLevelTime()
11058 {
11059   int i;
11060
11061   /* !!! SAME CODE AS IN "GameActions()" -- FIX THIS !!! */
11062   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
11063   {
11064     if (level.native_em_level->lev->home == 0)  /* all players at home */
11065     {
11066       PlayerWins(local_player);
11067
11068       AllPlayersGone = TRUE;
11069
11070       level.native_em_level->lev->home = -1;
11071     }
11072
11073     if (level.native_em_level->ply[0]->alive == 0 &&
11074         level.native_em_level->ply[1]->alive == 0 &&
11075         level.native_em_level->ply[2]->alive == 0 &&
11076         level.native_em_level->ply[3]->alive == 0)      /* all dead */
11077       AllPlayersGone = TRUE;
11078   }
11079   else if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
11080   {
11081     if (game_sp.LevelSolved &&
11082         !game_sp.GameOver)                              /* game won */
11083     {
11084       PlayerWins(local_player);
11085
11086       game_sp.GameOver = TRUE;
11087
11088       AllPlayersGone = TRUE;
11089     }
11090
11091     if (game_sp.GameOver)                               /* game lost */
11092       AllPlayersGone = TRUE;
11093   }
11094   else if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
11095   {
11096     if (game_mm.level_solved &&
11097         !game_mm.game_over)                             /* game won */
11098     {
11099       PlayerWins(local_player);
11100
11101       game_mm.game_over = TRUE;
11102
11103       AllPlayersGone = TRUE;
11104     }
11105
11106     if (game_mm.game_over)                              /* game lost */
11107       AllPlayersGone = TRUE;
11108   }
11109
11110   if (TimeFrames >= FRAMES_PER_SECOND)
11111   {
11112     TimeFrames = 0;
11113     TapeTime++;
11114
11115     for (i = 0; i < MAX_PLAYERS; i++)
11116     {
11117       struct PlayerInfo *player = &stored_player[i];
11118
11119       if (SHIELD_ON(player))
11120       {
11121         player->shield_normal_time_left--;
11122
11123         if (player->shield_deadly_time_left > 0)
11124           player->shield_deadly_time_left--;
11125       }
11126     }
11127
11128     if (!local_player->LevelSolved && !level.use_step_counter)
11129     {
11130       TimePlayed++;
11131
11132       if (TimeLeft > 0)
11133       {
11134         TimeLeft--;
11135
11136         if (TimeLeft <= 10 && setup.time_limit)
11137           PlaySound(SND_GAME_RUNNING_OUT_OF_TIME);
11138
11139         /* this does not make sense: game_panel_controls[GAME_PANEL_TIME].value
11140            is reset from other values in UpdateGameDoorValues() -- FIX THIS */
11141
11142         game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
11143
11144         if (!TimeLeft && setup.time_limit)
11145         {
11146           if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
11147             level.native_em_level->lev->killed_out_of_time = TRUE;
11148           else
11149             for (i = 0; i < MAX_PLAYERS; i++)
11150               KillPlayer(&stored_player[i]);
11151         }
11152       }
11153       else if (game.no_time_limit && !AllPlayersGone) /* level w/o time limit */
11154       {
11155         game_panel_controls[GAME_PANEL_TIME].value = TimePlayed;
11156       }
11157
11158       level.native_em_level->lev->time =
11159         (game.no_time_limit ? TimePlayed : TimeLeft);
11160     }
11161
11162     if (tape.recording || tape.playing)
11163       DrawVideoDisplay(VIDEO_STATE_TIME_ON, TapeTime);
11164   }
11165
11166   if (tape.recording || tape.playing)
11167     DrawVideoDisplay(VIDEO_STATE_FRAME_ON, FrameCounter);
11168
11169   UpdateAndDisplayGameControlValues();
11170 }
11171
11172 void AdvanceFrameAndPlayerCounters(int player_nr)
11173 {
11174   int i;
11175
11176   /* advance frame counters (global frame counter and time frame counter) */
11177   FrameCounter++;
11178   TimeFrames++;
11179
11180   /* advance player counters (counters for move delay, move animation etc.) */
11181   for (i = 0; i < MAX_PLAYERS; i++)
11182   {
11183     boolean advance_player_counters = (player_nr == -1 || player_nr == i);
11184     int move_delay_value = stored_player[i].move_delay_value;
11185     int move_frames = MOVE_DELAY_NORMAL_SPEED / move_delay_value;
11186
11187     if (!advance_player_counters)       /* not all players may be affected */
11188       continue;
11189
11190     if (move_frames == 0)       /* less than one move per game frame */
11191     {
11192       int stepsize = TILEX / move_delay_value;
11193       int delay = move_delay_value / MOVE_DELAY_NORMAL_SPEED;
11194       int count = (stored_player[i].is_moving ?
11195                    ABS(stored_player[i].MovPos) / stepsize : FrameCounter);
11196
11197       if (count % delay == 0)
11198         move_frames = 1;
11199     }
11200
11201     stored_player[i].Frame += move_frames;
11202
11203     if (stored_player[i].MovPos != 0)
11204       stored_player[i].StepFrame += move_frames;
11205
11206     if (stored_player[i].move_delay > 0)
11207       stored_player[i].move_delay--;
11208
11209     /* due to bugs in previous versions, counter must count up, not down */
11210     if (stored_player[i].push_delay != -1)
11211       stored_player[i].push_delay++;
11212
11213     if (stored_player[i].drop_delay > 0)
11214       stored_player[i].drop_delay--;
11215
11216     if (stored_player[i].is_dropping_pressed)
11217       stored_player[i].drop_pressed_delay++;
11218   }
11219 }
11220
11221 void StartGameActions(boolean init_network_game, boolean record_tape,
11222                       int random_seed)
11223 {
11224   unsigned int new_random_seed = InitRND(random_seed);
11225
11226   if (record_tape)
11227     TapeStartRecording(new_random_seed);
11228
11229   if (init_network_game)
11230   {
11231     SendToServer_StartPlaying();
11232
11233     return;
11234   }
11235
11236   InitGame();
11237 }
11238
11239 void GameActionsExt()
11240 {
11241 #if 0
11242   static unsigned int game_frame_delay = 0;
11243 #endif
11244   unsigned int game_frame_delay_value;
11245   byte *recorded_player_action;
11246   byte summarized_player_action = 0;
11247   byte tape_action[MAX_PLAYERS];
11248   int i;
11249
11250   /* detect endless loops, caused by custom element programming */
11251   if (recursion_loop_detected && recursion_loop_depth == 0)
11252   {
11253     char *message = getStringCat3("Internal Error! Element ",
11254                                   EL_NAME(recursion_loop_element),
11255                                   " caused endless loop! Quit the game?");
11256
11257     Error(ERR_WARN, "element '%s' caused endless loop in game engine",
11258           EL_NAME(recursion_loop_element));
11259
11260     RequestQuitGameExt(FALSE, level_editor_test_game, message);
11261
11262     recursion_loop_detected = FALSE;    /* if game should be continued */
11263
11264     free(message);
11265
11266     return;
11267   }
11268
11269   if (game.restart_level)
11270     StartGameActions(network.enabled, setup.autorecord, level.random_seed);
11271
11272   /* !!! SAME CODE AS IN "CheckLevelTime()" -- FIX THIS !!! */
11273   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
11274   {
11275     if (level.native_em_level->lev->home == 0)  /* all players at home */
11276     {
11277       PlayerWins(local_player);
11278
11279       AllPlayersGone = TRUE;
11280
11281       level.native_em_level->lev->home = -1;
11282     }
11283
11284     if (level.native_em_level->ply[0]->alive == 0 &&
11285         level.native_em_level->ply[1]->alive == 0 &&
11286         level.native_em_level->ply[2]->alive == 0 &&
11287         level.native_em_level->ply[3]->alive == 0)      /* all dead */
11288       AllPlayersGone = TRUE;
11289   }
11290   else if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
11291   {
11292     if (game_sp.LevelSolved &&
11293         !game_sp.GameOver)                              /* game won */
11294     {
11295       PlayerWins(local_player);
11296
11297       game_sp.GameOver = TRUE;
11298
11299       AllPlayersGone = TRUE;
11300     }
11301
11302     if (game_sp.GameOver)                               /* game lost */
11303       AllPlayersGone = TRUE;
11304   }
11305   else if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
11306   {
11307     if (game_mm.level_solved &&
11308         !game_mm.game_over)                             /* game won */
11309     {
11310       PlayerWins(local_player);
11311
11312       game_mm.game_over = TRUE;
11313
11314       AllPlayersGone = TRUE;
11315     }
11316
11317     if (game_mm.game_over)                              /* game lost */
11318       AllPlayersGone = TRUE;
11319   }
11320
11321   if (local_player->LevelSolved && !local_player->LevelSolved_GameEnd)
11322     GameWon();
11323
11324   if (AllPlayersGone && !TAPE_IS_STOPPED(tape))
11325     TapeStop();
11326
11327   if (game_status != GAME_MODE_PLAYING)         /* status might have changed */
11328     return;
11329
11330   game_frame_delay_value =
11331     (tape.playing && tape.fast_forward ? FfwdFrameDelay : GameFrameDelay);
11332
11333   if (tape.playing && tape.warp_forward && !tape.pausing)
11334     game_frame_delay_value = 0;
11335
11336   SetVideoFrameDelay(game_frame_delay_value);
11337
11338 #if 0
11339 #if 0
11340   /* ---------- main game synchronization point ---------- */
11341
11342   int skip = WaitUntilDelayReached(&game_frame_delay, game_frame_delay_value);
11343
11344   printf("::: skip == %d\n", skip);
11345
11346 #else
11347   /* ---------- main game synchronization point ---------- */
11348
11349   WaitUntilDelayReached(&game_frame_delay, game_frame_delay_value);
11350 #endif
11351 #endif
11352
11353   if (network_playing && !network_player_action_received)
11354   {
11355     /* try to get network player actions in time */
11356
11357     /* last chance to get network player actions without main loop delay */
11358     HandleNetworking();
11359
11360     /* game was quit by network peer */
11361     if (game_status != GAME_MODE_PLAYING)
11362       return;
11363
11364     if (!network_player_action_received)
11365       return;           /* failed to get network player actions in time */
11366
11367     /* do not yet reset "network_player_action_received" (for tape.pausing) */
11368   }
11369
11370   if (tape.pausing)
11371     return;
11372
11373   /* at this point we know that we really continue executing the game */
11374
11375   network_player_action_received = FALSE;
11376
11377   /* when playing tape, read previously recorded player input from tape data */
11378   recorded_player_action = (tape.playing ? TapePlayAction() : NULL);
11379
11380   local_player->effective_mouse_action = local_player->mouse_action;
11381
11382   if (recorded_player_action != NULL)
11383     SetMouseActionFromTapeAction(&local_player->effective_mouse_action,
11384                                  recorded_player_action);
11385
11386   /* TapePlayAction() may return NULL when toggling to "pause before death" */
11387   if (tape.pausing)
11388     return;
11389
11390   if (tape.set_centered_player)
11391   {
11392     game.centered_player_nr_next = tape.centered_player_nr_next;
11393     game.set_centered_player = TRUE;
11394   }
11395
11396   for (i = 0; i < MAX_PLAYERS; i++)
11397   {
11398     summarized_player_action |= stored_player[i].action;
11399
11400     if (!network_playing && (game.team_mode || tape.playing))
11401       stored_player[i].effective_action = stored_player[i].action;
11402   }
11403
11404   if (network_playing)
11405     SendToServer_MovePlayer(summarized_player_action);
11406
11407   // summarize all actions at local players mapped input device position
11408   // (this allows using different input devices in single player mode)
11409   if (!network.enabled && !game.team_mode)
11410     stored_player[map_player_action[local_player->index_nr]].effective_action =
11411       summarized_player_action;
11412
11413   if (tape.recording &&
11414       setup.team_mode &&
11415       setup.input_on_focus &&
11416       game.centered_player_nr != -1)
11417   {
11418     for (i = 0; i < MAX_PLAYERS; i++)
11419       stored_player[i].effective_action =
11420         (i == game.centered_player_nr ? summarized_player_action : 0);
11421   }
11422
11423   if (recorded_player_action != NULL)
11424     for (i = 0; i < MAX_PLAYERS; i++)
11425       stored_player[i].effective_action = recorded_player_action[i];
11426
11427   for (i = 0; i < MAX_PLAYERS; i++)
11428   {
11429     tape_action[i] = stored_player[i].effective_action;
11430
11431     /* (this may happen in the RND game engine if a player was not present on
11432        the playfield on level start, but appeared later from a custom element */
11433     if (setup.team_mode &&
11434         tape.recording &&
11435         tape_action[i] &&
11436         !tape.player_participates[i])
11437       tape.player_participates[i] = TRUE;
11438   }
11439
11440   SetTapeActionFromMouseAction(tape_action,
11441                                &local_player->effective_mouse_action);
11442
11443   /* only record actions from input devices, but not programmed actions */
11444   if (tape.recording)
11445     TapeRecordAction(tape_action);
11446
11447 #if USE_NEW_PLAYER_ASSIGNMENTS
11448   // !!! also map player actions in single player mode !!!
11449   // if (game.team_mode)
11450   if (1)
11451   {
11452     byte mapped_action[MAX_PLAYERS];
11453
11454 #if DEBUG_PLAYER_ACTIONS
11455     printf(":::");
11456     for (i = 0; i < MAX_PLAYERS; i++)
11457       printf(" %d, ", stored_player[i].effective_action);
11458 #endif
11459
11460     for (i = 0; i < MAX_PLAYERS; i++)
11461       mapped_action[i] = stored_player[map_player_action[i]].effective_action;
11462
11463     for (i = 0; i < MAX_PLAYERS; i++)
11464       stored_player[i].effective_action = mapped_action[i];
11465
11466 #if DEBUG_PLAYER_ACTIONS
11467     printf(" =>");
11468     for (i = 0; i < MAX_PLAYERS; i++)
11469       printf(" %d, ", stored_player[i].effective_action);
11470     printf("\n");
11471 #endif
11472   }
11473 #if DEBUG_PLAYER_ACTIONS
11474   else
11475   {
11476     printf(":::");
11477     for (i = 0; i < MAX_PLAYERS; i++)
11478       printf(" %d, ", stored_player[i].effective_action);
11479     printf("\n");
11480   }
11481 #endif
11482 #endif
11483
11484   for (i = 0; i < MAX_PLAYERS; i++)
11485   {
11486     // allow engine snapshot in case of changed movement attempt
11487     if ((game.snapshot.last_action[i] & KEY_MOTION) !=
11488         (stored_player[i].effective_action & KEY_MOTION))
11489       game.snapshot.changed_action = TRUE;
11490
11491     // allow engine snapshot in case of snapping/dropping attempt
11492     if ((game.snapshot.last_action[i] & KEY_BUTTON) == 0 &&
11493         (stored_player[i].effective_action & KEY_BUTTON) != 0)
11494       game.snapshot.changed_action = TRUE;
11495
11496     game.snapshot.last_action[i] = stored_player[i].effective_action;
11497   }
11498
11499   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
11500   {
11501     GameActions_EM_Main();
11502   }
11503   else if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
11504   {
11505     GameActions_SP_Main();
11506   }
11507   else if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
11508   {
11509     GameActions_MM_Main();
11510   }
11511   else
11512   {
11513     GameActions_RND_Main();
11514   }
11515
11516   BlitScreenToBitmap(backbuffer);
11517
11518   CheckLevelTime();
11519
11520   AdvanceFrameAndPlayerCounters(-1);    /* advance counters for all players */
11521
11522   if (global.show_frames_per_second)
11523   {
11524     static unsigned int fps_counter = 0;
11525     static int fps_frames = 0;
11526     unsigned int fps_delay_ms = Counter() - fps_counter;
11527
11528     fps_frames++;
11529
11530     if (fps_delay_ms >= 500)    /* calculate FPS every 0.5 seconds */
11531     {
11532       global.frames_per_second = 1000 * (float)fps_frames / fps_delay_ms;
11533
11534       fps_frames = 0;
11535       fps_counter = Counter();
11536
11537       /* always draw FPS to screen after FPS value was updated */
11538       redraw_mask |= REDRAW_FPS;
11539     }
11540
11541     /* only draw FPS if no screen areas are deactivated (invisible warp mode) */
11542     if (GetDrawDeactivationMask() == REDRAW_NONE)
11543       redraw_mask |= REDRAW_FPS;
11544   }
11545 }
11546
11547 static void GameActions_CheckSaveEngineSnapshot()
11548 {
11549   if (!game.snapshot.save_snapshot)
11550     return;
11551
11552   // clear flag for saving snapshot _before_ saving snapshot
11553   game.snapshot.save_snapshot = FALSE;
11554
11555   SaveEngineSnapshotToList();
11556 }
11557
11558 void GameActions()
11559 {
11560   GameActionsExt();
11561
11562   GameActions_CheckSaveEngineSnapshot();
11563 }
11564
11565 void GameActions_EM_Main()
11566 {
11567   byte effective_action[MAX_PLAYERS];
11568   boolean warp_mode = (tape.playing && tape.warp_forward && !tape.pausing);
11569   int i;
11570
11571   for (i = 0; i < MAX_PLAYERS; i++)
11572     effective_action[i] = stored_player[i].effective_action;
11573
11574   GameActions_EM(effective_action, warp_mode);
11575 }
11576
11577 void GameActions_SP_Main()
11578 {
11579   byte effective_action[MAX_PLAYERS];
11580   boolean warp_mode = (tape.playing && tape.warp_forward && !tape.pausing);
11581   int i;
11582
11583   for (i = 0; i < MAX_PLAYERS; i++)
11584     effective_action[i] = stored_player[i].effective_action;
11585
11586   GameActions_SP(effective_action, warp_mode);
11587
11588   for (i = 0; i < MAX_PLAYERS; i++)
11589   {
11590     if (stored_player[i].force_dropping)
11591       stored_player[i].action |= KEY_BUTTON_DROP;
11592
11593     stored_player[i].force_dropping = FALSE;
11594   }
11595 }
11596
11597 void GameActions_MM_Main()
11598 {
11599   boolean warp_mode = (tape.playing && tape.warp_forward && !tape.pausing);
11600
11601   GameActions_MM(local_player->effective_mouse_action, warp_mode);
11602 }
11603
11604 void GameActions_RND_Main()
11605 {
11606   GameActions_RND();
11607 }
11608
11609 void GameActions_RND()
11610 {
11611   int magic_wall_x = 0, magic_wall_y = 0;
11612   int i, x, y, element, graphic, last_gfx_frame;
11613
11614   InitPlayfieldScanModeVars();
11615
11616   if (game.engine_version >= VERSION_IDENT(3,2,0,7))
11617   {
11618     SCAN_PLAYFIELD(x, y)
11619     {
11620       ChangeCount[x][y] = 0;
11621       ChangeEvent[x][y] = -1;
11622     }
11623   }
11624
11625   if (game.set_centered_player)
11626   {
11627     boolean all_players_fit_to_screen = checkIfAllPlayersFitToScreen_RND();
11628
11629     /* switching to "all players" only possible if all players fit to screen */
11630     if (game.centered_player_nr_next == -1 && !all_players_fit_to_screen)
11631     {
11632       game.centered_player_nr_next = game.centered_player_nr;
11633       game.set_centered_player = FALSE;
11634     }
11635
11636     /* do not switch focus to non-existing (or non-active) player */
11637     if (game.centered_player_nr_next >= 0 &&
11638         !stored_player[game.centered_player_nr_next].active)
11639     {
11640       game.centered_player_nr_next = game.centered_player_nr;
11641       game.set_centered_player = FALSE;
11642     }
11643   }
11644
11645   if (game.set_centered_player &&
11646       ScreenMovPos == 0)        /* screen currently aligned at tile position */
11647   {
11648     int sx, sy;
11649
11650     if (game.centered_player_nr_next == -1)
11651     {
11652       setScreenCenteredToAllPlayers(&sx, &sy);
11653     }
11654     else
11655     {
11656       sx = stored_player[game.centered_player_nr_next].jx;
11657       sy = stored_player[game.centered_player_nr_next].jy;
11658     }
11659
11660     game.centered_player_nr = game.centered_player_nr_next;
11661     game.set_centered_player = FALSE;
11662
11663     DrawRelocateScreen(0, 0, sx, sy, MV_NONE, TRUE, setup.quick_switch);
11664     DrawGameDoorValues();
11665   }
11666
11667   for (i = 0; i < MAX_PLAYERS; i++)
11668   {
11669     int actual_player_action = stored_player[i].effective_action;
11670
11671 #if 1
11672     /* !!! THIS BREAKS THE FOLLOWING TAPES: !!!
11673        - rnd_equinox_tetrachloride 048
11674        - rnd_equinox_tetrachloride_ii 096
11675        - rnd_emanuel_schmieg 002
11676        - doctor_sloan_ww 001, 020
11677     */
11678     if (stored_player[i].MovPos == 0)
11679       CheckGravityMovement(&stored_player[i]);
11680 #endif
11681
11682     /* overwrite programmed action with tape action */
11683     if (stored_player[i].programmed_action)
11684       actual_player_action = stored_player[i].programmed_action;
11685
11686     PlayerActions(&stored_player[i], actual_player_action);
11687
11688     ScrollPlayer(&stored_player[i], SCROLL_GO_ON);
11689   }
11690
11691   ScrollScreen(NULL, SCROLL_GO_ON);
11692
11693   /* for backwards compatibility, the following code emulates a fixed bug that
11694      occured when pushing elements (causing elements that just made their last
11695      pushing step to already (if possible) make their first falling step in the
11696      same game frame, which is bad); this code is also needed to use the famous
11697      "spring push bug" which is used in older levels and might be wanted to be
11698      used also in newer levels, but in this case the buggy pushing code is only
11699      affecting the "spring" element and no other elements */
11700
11701   if (game.engine_version < VERSION_IDENT(2,2,0,7) || level.use_spring_bug)
11702   {
11703     for (i = 0; i < MAX_PLAYERS; i++)
11704     {
11705       struct PlayerInfo *player = &stored_player[i];
11706       int x = player->jx;
11707       int y = player->jy;
11708
11709       if (player->active && player->is_pushing && player->is_moving &&
11710           IS_MOVING(x, y) &&
11711           (game.engine_version < VERSION_IDENT(2,2,0,7) ||
11712            Feld[x][y] == EL_SPRING))
11713       {
11714         ContinueMoving(x, y);
11715
11716         /* continue moving after pushing (this is actually a bug) */
11717         if (!IS_MOVING(x, y))
11718           Stop[x][y] = FALSE;
11719       }
11720     }
11721   }
11722
11723   SCAN_PLAYFIELD(x, y)
11724   {
11725     ChangeCount[x][y] = 0;
11726     ChangeEvent[x][y] = -1;
11727
11728     /* this must be handled before main playfield loop */
11729     if (Feld[x][y] == EL_PLAYER_IS_LEAVING)
11730     {
11731       MovDelay[x][y]--;
11732       if (MovDelay[x][y] <= 0)
11733         RemoveField(x, y);
11734     }
11735
11736     if (Feld[x][y] == EL_ELEMENT_SNAPPING)
11737     {
11738       MovDelay[x][y]--;
11739       if (MovDelay[x][y] <= 0)
11740       {
11741         RemoveField(x, y);
11742         TEST_DrawLevelField(x, y);
11743
11744         TestIfElementTouchesCustomElement(x, y);        /* for empty space */
11745       }
11746     }
11747
11748 #if DEBUG
11749     if (ChangePage[x][y] != -1 && ChangeDelay[x][y] != 1)
11750     {
11751       printf("GameActions(): x = %d, y = %d: ChangePage != -1\n", x, y);
11752       printf("GameActions(): This should never happen!\n");
11753
11754       ChangePage[x][y] = -1;
11755     }
11756 #endif
11757
11758     Stop[x][y] = FALSE;
11759     if (WasJustMoving[x][y] > 0)
11760       WasJustMoving[x][y]--;
11761     if (WasJustFalling[x][y] > 0)
11762       WasJustFalling[x][y]--;
11763     if (CheckCollision[x][y] > 0)
11764       CheckCollision[x][y]--;
11765     if (CheckImpact[x][y] > 0)
11766       CheckImpact[x][y]--;
11767
11768     GfxFrame[x][y]++;
11769
11770     /* reset finished pushing action (not done in ContinueMoving() to allow
11771        continuous pushing animation for elements with zero push delay) */
11772     if (GfxAction[x][y] == ACTION_PUSHING && !IS_MOVING(x, y))
11773     {
11774       ResetGfxAnimation(x, y);
11775       TEST_DrawLevelField(x, y);
11776     }
11777
11778 #if DEBUG
11779     if (IS_BLOCKED(x, y))
11780     {
11781       int oldx, oldy;
11782
11783       Blocked2Moving(x, y, &oldx, &oldy);
11784       if (!IS_MOVING(oldx, oldy))
11785       {
11786         printf("GameActions(): (BLOCKED => MOVING) context corrupted!\n");
11787         printf("GameActions(): BLOCKED: x = %d, y = %d\n", x, y);
11788         printf("GameActions(): !MOVING: oldx = %d, oldy = %d\n", oldx, oldy);
11789         printf("GameActions(): This should never happen!\n");
11790       }
11791     }
11792 #endif
11793   }
11794
11795   SCAN_PLAYFIELD(x, y)
11796   {
11797     element = Feld[x][y];
11798     graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
11799     last_gfx_frame = GfxFrame[x][y];
11800
11801     ResetGfxFrame(x, y);
11802
11803     if (GfxFrame[x][y] != last_gfx_frame && !Stop[x][y])
11804       DrawLevelGraphicAnimation(x, y, graphic);
11805
11806     if (ANIM_MODE(graphic) == ANIM_RANDOM &&
11807         IS_NEXT_FRAME(GfxFrame[x][y], graphic))
11808       ResetRandomAnimationValue(x, y);
11809
11810     SetRandomAnimationValue(x, y);
11811
11812     PlayLevelSoundActionIfLoop(x, y, GfxAction[x][y]);
11813
11814     if (IS_INACTIVE(element))
11815     {
11816       if (IS_ANIMATED(graphic))
11817         DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
11818
11819       continue;
11820     }
11821
11822     /* this may take place after moving, so 'element' may have changed */
11823     if (IS_CHANGING(x, y) &&
11824         (game.engine_version < VERSION_IDENT(3,0,7,1) || !Stop[x][y]))
11825     {
11826       int page = element_info[element].event_page_nr[CE_DELAY];
11827
11828       HandleElementChange(x, y, page);
11829
11830       element = Feld[x][y];
11831       graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
11832     }
11833
11834     if (!IS_MOVING(x, y) && (CAN_FALL(element) || CAN_MOVE(element)))
11835     {
11836       StartMoving(x, y);
11837
11838       element = Feld[x][y];
11839       graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
11840
11841       if (IS_ANIMATED(graphic) &&
11842           !IS_MOVING(x, y) &&
11843           !Stop[x][y])
11844         DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
11845
11846       if (IS_GEM(element) || element == EL_SP_INFOTRON)
11847         TEST_DrawTwinkleOnField(x, y);
11848     }
11849     else if (element == EL_ACID)
11850     {
11851       if (!Stop[x][y])
11852         DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
11853     }
11854     else if ((element == EL_EXIT_OPEN ||
11855               element == EL_EM_EXIT_OPEN ||
11856               element == EL_SP_EXIT_OPEN ||
11857               element == EL_STEEL_EXIT_OPEN ||
11858               element == EL_EM_STEEL_EXIT_OPEN ||
11859               element == EL_SP_TERMINAL ||
11860               element == EL_SP_TERMINAL_ACTIVE ||
11861               element == EL_EXTRA_TIME ||
11862               element == EL_SHIELD_NORMAL ||
11863               element == EL_SHIELD_DEADLY) &&
11864              IS_ANIMATED(graphic))
11865       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
11866     else if (IS_MOVING(x, y))
11867       ContinueMoving(x, y);
11868     else if (IS_ACTIVE_BOMB(element))
11869       CheckDynamite(x, y);
11870     else if (element == EL_AMOEBA_GROWING)
11871       AmoebeWaechst(x, y);
11872     else if (element == EL_AMOEBA_SHRINKING)
11873       AmoebaDisappearing(x, y);
11874
11875 #if !USE_NEW_AMOEBA_CODE
11876     else if (IS_AMOEBALIVE(element))
11877       AmoebeAbleger(x, y);
11878 #endif
11879
11880     else if (element == EL_GAME_OF_LIFE || element == EL_BIOMAZE)
11881       Life(x, y);
11882     else if (element == EL_EXIT_CLOSED)
11883       CheckExit(x, y);
11884     else if (element == EL_EM_EXIT_CLOSED)
11885       CheckExitEM(x, y);
11886     else if (element == EL_STEEL_EXIT_CLOSED)
11887       CheckExitSteel(x, y);
11888     else if (element == EL_EM_STEEL_EXIT_CLOSED)
11889       CheckExitSteelEM(x, y);
11890     else if (element == EL_SP_EXIT_CLOSED)
11891       CheckExitSP(x, y);
11892     else if (element == EL_EXPANDABLE_WALL_GROWING ||
11893              element == EL_EXPANDABLE_STEELWALL_GROWING)
11894       MauerWaechst(x, y);
11895     else if (element == EL_EXPANDABLE_WALL ||
11896              element == EL_EXPANDABLE_WALL_HORIZONTAL ||
11897              element == EL_EXPANDABLE_WALL_VERTICAL ||
11898              element == EL_EXPANDABLE_WALL_ANY ||
11899              element == EL_BD_EXPANDABLE_WALL)
11900       MauerAbleger(x, y);
11901     else if (element == EL_EXPANDABLE_STEELWALL_HORIZONTAL ||
11902              element == EL_EXPANDABLE_STEELWALL_VERTICAL ||
11903              element == EL_EXPANDABLE_STEELWALL_ANY)
11904       MauerAblegerStahl(x, y);
11905     else if (element == EL_FLAMES)
11906       CheckForDragon(x, y);
11907     else if (element == EL_EXPLOSION)
11908       ; /* drawing of correct explosion animation is handled separately */
11909     else if (element == EL_ELEMENT_SNAPPING ||
11910              element == EL_DIAGONAL_SHRINKING ||
11911              element == EL_DIAGONAL_GROWING)
11912     {
11913       graphic = el_act_dir2img(GfxElement[x][y], GfxAction[x][y],GfxDir[x][y]);
11914
11915       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
11916     }
11917     else if (IS_ANIMATED(graphic) && !IS_CHANGING(x, y))
11918       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
11919
11920     if (IS_BELT_ACTIVE(element))
11921       PlayLevelSoundAction(x, y, ACTION_ACTIVE);
11922
11923     if (game.magic_wall_active)
11924     {
11925       int jx = local_player->jx, jy = local_player->jy;
11926
11927       /* play the element sound at the position nearest to the player */
11928       if ((element == EL_MAGIC_WALL_FULL ||
11929            element == EL_MAGIC_WALL_ACTIVE ||
11930            element == EL_MAGIC_WALL_EMPTYING ||
11931            element == EL_BD_MAGIC_WALL_FULL ||
11932            element == EL_BD_MAGIC_WALL_ACTIVE ||
11933            element == EL_BD_MAGIC_WALL_EMPTYING ||
11934            element == EL_DC_MAGIC_WALL_FULL ||
11935            element == EL_DC_MAGIC_WALL_ACTIVE ||
11936            element == EL_DC_MAGIC_WALL_EMPTYING) &&
11937           ABS(x-jx) + ABS(y-jy) < ABS(magic_wall_x-jx) + ABS(magic_wall_y-jy))
11938       {
11939         magic_wall_x = x;
11940         magic_wall_y = y;
11941       }
11942     }
11943   }
11944
11945 #if USE_NEW_AMOEBA_CODE
11946   /* new experimental amoeba growth stuff */
11947   if (!(FrameCounter % 8))
11948   {
11949     static unsigned int random = 1684108901;
11950
11951     for (i = 0; i < level.amoeba_speed * 28 / 8; i++)
11952     {
11953       x = RND(lev_fieldx);
11954       y = RND(lev_fieldy);
11955       element = Feld[x][y];
11956
11957       if (!IS_PLAYER(x,y) &&
11958           (element == EL_EMPTY ||
11959            CAN_GROW_INTO(element) ||
11960            element == EL_QUICKSAND_EMPTY ||
11961            element == EL_QUICKSAND_FAST_EMPTY ||
11962            element == EL_ACID_SPLASH_LEFT ||
11963            element == EL_ACID_SPLASH_RIGHT))
11964       {
11965         if ((IN_LEV_FIELD(x, y-1) && Feld[x][y-1] == EL_AMOEBA_WET) ||
11966             (IN_LEV_FIELD(x-1, y) && Feld[x-1][y] == EL_AMOEBA_WET) ||
11967             (IN_LEV_FIELD(x+1, y) && Feld[x+1][y] == EL_AMOEBA_WET) ||
11968             (IN_LEV_FIELD(x, y+1) && Feld[x][y+1] == EL_AMOEBA_WET))
11969           Feld[x][y] = EL_AMOEBA_DROP;
11970       }
11971
11972       random = random * 129 + 1;
11973     }
11974   }
11975 #endif
11976
11977   game.explosions_delayed = FALSE;
11978
11979   SCAN_PLAYFIELD(x, y)
11980   {
11981     element = Feld[x][y];
11982
11983     if (ExplodeField[x][y])
11984       Explode(x, y, EX_PHASE_START, ExplodeField[x][y]);
11985     else if (element == EL_EXPLOSION)
11986       Explode(x, y, ExplodePhase[x][y], EX_TYPE_NORMAL);
11987
11988     ExplodeField[x][y] = EX_TYPE_NONE;
11989   }
11990
11991   game.explosions_delayed = TRUE;
11992
11993   if (game.magic_wall_active)
11994   {
11995     if (!(game.magic_wall_time_left % 4))
11996     {
11997       int element = Feld[magic_wall_x][magic_wall_y];
11998
11999       if (element == EL_BD_MAGIC_WALL_FULL ||
12000           element == EL_BD_MAGIC_WALL_ACTIVE ||
12001           element == EL_BD_MAGIC_WALL_EMPTYING)
12002         PlayLevelSound(magic_wall_x, magic_wall_y, SND_BD_MAGIC_WALL_ACTIVE);
12003       else if (element == EL_DC_MAGIC_WALL_FULL ||
12004                element == EL_DC_MAGIC_WALL_ACTIVE ||
12005                element == EL_DC_MAGIC_WALL_EMPTYING)
12006         PlayLevelSound(magic_wall_x, magic_wall_y, SND_DC_MAGIC_WALL_ACTIVE);
12007       else
12008         PlayLevelSound(magic_wall_x, magic_wall_y, SND_MAGIC_WALL_ACTIVE);
12009     }
12010
12011     if (game.magic_wall_time_left > 0)
12012     {
12013       game.magic_wall_time_left--;
12014
12015       if (!game.magic_wall_time_left)
12016       {
12017         SCAN_PLAYFIELD(x, y)
12018         {
12019           element = Feld[x][y];
12020
12021           if (element == EL_MAGIC_WALL_ACTIVE ||
12022               element == EL_MAGIC_WALL_FULL)
12023           {
12024             Feld[x][y] = EL_MAGIC_WALL_DEAD;
12025             TEST_DrawLevelField(x, y);
12026           }
12027           else if (element == EL_BD_MAGIC_WALL_ACTIVE ||
12028                    element == EL_BD_MAGIC_WALL_FULL)
12029           {
12030             Feld[x][y] = EL_BD_MAGIC_WALL_DEAD;
12031             TEST_DrawLevelField(x, y);
12032           }
12033           else if (element == EL_DC_MAGIC_WALL_ACTIVE ||
12034                    element == EL_DC_MAGIC_WALL_FULL)
12035           {
12036             Feld[x][y] = EL_DC_MAGIC_WALL_DEAD;
12037             TEST_DrawLevelField(x, y);
12038           }
12039         }
12040
12041         game.magic_wall_active = FALSE;
12042       }
12043     }
12044   }
12045
12046   if (game.light_time_left > 0)
12047   {
12048     game.light_time_left--;
12049
12050     if (game.light_time_left == 0)
12051       RedrawAllLightSwitchesAndInvisibleElements();
12052   }
12053
12054   if (game.timegate_time_left > 0)
12055   {
12056     game.timegate_time_left--;
12057
12058     if (game.timegate_time_left == 0)
12059       CloseAllOpenTimegates();
12060   }
12061
12062   if (game.lenses_time_left > 0)
12063   {
12064     game.lenses_time_left--;
12065
12066     if (game.lenses_time_left == 0)
12067       RedrawAllInvisibleElementsForLenses();
12068   }
12069
12070   if (game.magnify_time_left > 0)
12071   {
12072     game.magnify_time_left--;
12073
12074     if (game.magnify_time_left == 0)
12075       RedrawAllInvisibleElementsForMagnifier();
12076   }
12077
12078   for (i = 0; i < MAX_PLAYERS; i++)
12079   {
12080     struct PlayerInfo *player = &stored_player[i];
12081
12082     if (SHIELD_ON(player))
12083     {
12084       if (player->shield_deadly_time_left)
12085         PlayLevelSound(player->jx, player->jy, SND_SHIELD_DEADLY_ACTIVE);
12086       else if (player->shield_normal_time_left)
12087         PlayLevelSound(player->jx, player->jy, SND_SHIELD_NORMAL_ACTIVE);
12088     }
12089   }
12090
12091 #if USE_DELAYED_GFX_REDRAW
12092   SCAN_PLAYFIELD(x, y)
12093   {
12094     if (GfxRedraw[x][y] != GFX_REDRAW_NONE)
12095     {
12096       /* !!! PROBLEM: THIS REDRAWS THE PLAYFIELD _AFTER_ THE SCAN, BUT TILES
12097          !!! MAY HAVE CHANGED AFTER BEING DRAWN DURING PLAYFIELD SCAN !!! */
12098
12099       if (GfxRedraw[x][y] & GFX_REDRAW_TILE)
12100         DrawLevelField(x, y);
12101
12102       if (GfxRedraw[x][y] & GFX_REDRAW_TILE_CRUMBLED)
12103         DrawLevelFieldCrumbled(x, y);
12104
12105       if (GfxRedraw[x][y] & GFX_REDRAW_TILE_CRUMBLED_NEIGHBOURS)
12106         DrawLevelFieldCrumbledNeighbours(x, y);
12107
12108       if (GfxRedraw[x][y] & GFX_REDRAW_TILE_TWINKLED)
12109         DrawTwinkleOnField(x, y);
12110     }
12111
12112     GfxRedraw[x][y] = GFX_REDRAW_NONE;
12113   }
12114 #endif
12115
12116   DrawAllPlayers();
12117   PlayAllPlayersSound();
12118
12119   if (local_player->show_envelope != 0 && local_player->MovPos == 0)
12120   {
12121     ShowEnvelope(local_player->show_envelope - EL_ENVELOPE_1);
12122
12123     local_player->show_envelope = 0;
12124   }
12125
12126   /* use random number generator in every frame to make it less predictable */
12127   if (game.engine_version >= VERSION_IDENT(3,1,1,0))
12128     RND(1);
12129 }
12130
12131 static boolean AllPlayersInSight(struct PlayerInfo *player, int x, int y)
12132 {
12133   int min_x = x, min_y = y, max_x = x, max_y = y;
12134   int i;
12135
12136   for (i = 0; i < MAX_PLAYERS; i++)
12137   {
12138     int jx = stored_player[i].jx, jy = stored_player[i].jy;
12139
12140     if (!stored_player[i].active || &stored_player[i] == player)
12141       continue;
12142
12143     min_x = MIN(min_x, jx);
12144     min_y = MIN(min_y, jy);
12145     max_x = MAX(max_x, jx);
12146     max_y = MAX(max_y, jy);
12147   }
12148
12149   return (max_x - min_x < SCR_FIELDX && max_y - min_y < SCR_FIELDY);
12150 }
12151
12152 static boolean AllPlayersInVisibleScreen()
12153 {
12154   int i;
12155
12156   for (i = 0; i < MAX_PLAYERS; i++)
12157   {
12158     int jx = stored_player[i].jx, jy = stored_player[i].jy;
12159
12160     if (!stored_player[i].active)
12161       continue;
12162
12163     if (!IN_VIS_FIELD(SCREENX(jx), SCREENY(jy)))
12164       return FALSE;
12165   }
12166
12167   return TRUE;
12168 }
12169
12170 void ScrollLevel(int dx, int dy)
12171 {
12172   int scroll_offset = 2 * TILEX_VAR;
12173   int x, y;
12174
12175   BlitBitmap(drawto_field, drawto_field,
12176              FX + TILEX_VAR * (dx == -1) - scroll_offset,
12177              FY + TILEY_VAR * (dy == -1) - scroll_offset,
12178              SXSIZE - TILEX_VAR * (dx != 0) + 2 * scroll_offset,
12179              SYSIZE - TILEY_VAR * (dy != 0) + 2 * scroll_offset,
12180              FX + TILEX_VAR * (dx == 1) - scroll_offset,
12181              FY + TILEY_VAR * (dy == 1) - scroll_offset);
12182
12183   if (dx != 0)
12184   {
12185     x = (dx == 1 ? BX1 : BX2);
12186     for (y = BY1; y <= BY2; y++)
12187       DrawScreenField(x, y);
12188   }
12189
12190   if (dy != 0)
12191   {
12192     y = (dy == 1 ? BY1 : BY2);
12193     for (x = BX1; x <= BX2; x++)
12194       DrawScreenField(x, y);
12195   }
12196
12197   redraw_mask |= REDRAW_FIELD;
12198 }
12199
12200 static boolean canFallDown(struct PlayerInfo *player)
12201 {
12202   int jx = player->jx, jy = player->jy;
12203
12204   return (IN_LEV_FIELD(jx, jy + 1) &&
12205           (IS_FREE(jx, jy + 1) ||
12206            (Feld[jx][jy + 1] == EL_ACID && player->can_fall_into_acid)) &&
12207           IS_WALKABLE_FROM(Feld[jx][jy], MV_DOWN) &&
12208           !IS_WALKABLE_INSIDE(Feld[jx][jy]));
12209 }
12210
12211 static boolean canPassField(int x, int y, int move_dir)
12212 {
12213   int opposite_dir = MV_DIR_OPPOSITE(move_dir);
12214   int dx = (move_dir & MV_LEFT ? -1 : move_dir & MV_RIGHT ? +1 : 0);
12215   int dy = (move_dir & MV_UP   ? -1 : move_dir & MV_DOWN  ? +1 : 0);
12216   int nextx = x + dx;
12217   int nexty = y + dy;
12218   int element = Feld[x][y];
12219
12220   return (IS_PASSABLE_FROM(element, opposite_dir) &&
12221           !CAN_MOVE(element) &&
12222           IN_LEV_FIELD(nextx, nexty) && !IS_PLAYER(nextx, nexty) &&
12223           IS_WALKABLE_FROM(Feld[nextx][nexty], move_dir) &&
12224           (level.can_pass_to_walkable || IS_FREE(nextx, nexty)));
12225 }
12226
12227 static boolean canMoveToValidFieldWithGravity(int x, int y, int move_dir)
12228 {
12229   int opposite_dir = MV_DIR_OPPOSITE(move_dir);
12230   int dx = (move_dir & MV_LEFT ? -1 : move_dir & MV_RIGHT ? +1 : 0);
12231   int dy = (move_dir & MV_UP   ? -1 : move_dir & MV_DOWN  ? +1 : 0);
12232   int newx = x + dx;
12233   int newy = y + dy;
12234
12235   return (IN_LEV_FIELD(newx, newy) && !IS_FREE_OR_PLAYER(newx, newy) &&
12236           IS_GRAVITY_REACHABLE(Feld[newx][newy]) &&
12237           (IS_DIGGABLE(Feld[newx][newy]) ||
12238            IS_WALKABLE_FROM(Feld[newx][newy], opposite_dir) ||
12239            canPassField(newx, newy, move_dir)));
12240 }
12241
12242 static void CheckGravityMovement(struct PlayerInfo *player)
12243 {
12244   if (player->gravity && !player->programmed_action)
12245   {
12246     int move_dir_horizontal = player->effective_action & MV_HORIZONTAL;
12247     int move_dir_vertical   = player->effective_action & MV_VERTICAL;
12248     boolean player_is_snapping = (player->effective_action & JOY_BUTTON_1);
12249     int jx = player->jx, jy = player->jy;
12250     boolean player_is_moving_to_valid_field =
12251       (!player_is_snapping &&
12252        (canMoveToValidFieldWithGravity(jx, jy, move_dir_horizontal) ||
12253         canMoveToValidFieldWithGravity(jx, jy, move_dir_vertical)));
12254     boolean player_can_fall_down = canFallDown(player);
12255
12256     if (player_can_fall_down &&
12257         !player_is_moving_to_valid_field)
12258       player->programmed_action = MV_DOWN;
12259   }
12260 }
12261
12262 static void CheckGravityMovementWhenNotMoving(struct PlayerInfo *player)
12263 {
12264   return CheckGravityMovement(player);
12265
12266   if (player->gravity && !player->programmed_action)
12267   {
12268     int jx = player->jx, jy = player->jy;
12269     boolean field_under_player_is_free =
12270       (IN_LEV_FIELD(jx, jy + 1) && IS_FREE(jx, jy + 1));
12271     boolean player_is_standing_on_valid_field =
12272       (IS_WALKABLE_INSIDE(Feld[jx][jy]) ||
12273        (IS_WALKABLE(Feld[jx][jy]) &&
12274         !(element_info[Feld[jx][jy]].access_direction & MV_DOWN)));
12275
12276     if (field_under_player_is_free && !player_is_standing_on_valid_field)
12277       player->programmed_action = MV_DOWN;
12278   }
12279 }
12280
12281 /*
12282   MovePlayerOneStep()
12283   -----------------------------------------------------------------------------
12284   dx, dy:               direction (non-diagonal) to try to move the player to
12285   real_dx, real_dy:     direction as read from input device (can be diagonal)
12286 */
12287
12288 boolean MovePlayerOneStep(struct PlayerInfo *player,
12289                           int dx, int dy, int real_dx, int real_dy)
12290 {
12291   int jx = player->jx, jy = player->jy;
12292   int new_jx = jx + dx, new_jy = jy + dy;
12293   int can_move;
12294   boolean player_can_move = !player->cannot_move;
12295
12296   if (!player->active || (!dx && !dy))
12297     return MP_NO_ACTION;
12298
12299   player->MovDir = (dx < 0 ? MV_LEFT :
12300                     dx > 0 ? MV_RIGHT :
12301                     dy < 0 ? MV_UP :
12302                     dy > 0 ? MV_DOWN :  MV_NONE);
12303
12304   if (!IN_LEV_FIELD(new_jx, new_jy))
12305     return MP_NO_ACTION;
12306
12307   if (!player_can_move)
12308   {
12309     if (player->MovPos == 0)
12310     {
12311       player->is_moving = FALSE;
12312       player->is_digging = FALSE;
12313       player->is_collecting = FALSE;
12314       player->is_snapping = FALSE;
12315       player->is_pushing = FALSE;
12316     }
12317   }
12318
12319   if (!network.enabled && game.centered_player_nr == -1 &&
12320       !AllPlayersInSight(player, new_jx, new_jy))
12321     return MP_NO_ACTION;
12322
12323   can_move = DigField(player, jx, jy, new_jx, new_jy, real_dx,real_dy, DF_DIG);
12324   if (can_move != MP_MOVING)
12325     return can_move;
12326
12327   /* check if DigField() has caused relocation of the player */
12328   if (player->jx != jx || player->jy != jy)
12329     return MP_NO_ACTION;        /* <-- !!! CHECK THIS [-> MP_ACTION ?] !!! */
12330
12331   StorePlayer[jx][jy] = 0;
12332   player->last_jx = jx;
12333   player->last_jy = jy;
12334   player->jx = new_jx;
12335   player->jy = new_jy;
12336   StorePlayer[new_jx][new_jy] = player->element_nr;
12337
12338   if (player->move_delay_value_next != -1)
12339   {
12340     player->move_delay_value = player->move_delay_value_next;
12341     player->move_delay_value_next = -1;
12342   }
12343
12344   player->MovPos =
12345     (dx > 0 || dy > 0 ? -1 : 1) * (TILEX - TILEX / player->move_delay_value);
12346
12347   player->step_counter++;
12348
12349   PlayerVisit[jx][jy] = FrameCounter;
12350
12351   player->is_moving = TRUE;
12352
12353 #if 1
12354   /* should better be called in MovePlayer(), but this breaks some tapes */
12355   ScrollPlayer(player, SCROLL_INIT);
12356 #endif
12357
12358   return MP_MOVING;
12359 }
12360
12361 boolean MovePlayer(struct PlayerInfo *player, int dx, int dy)
12362 {
12363   int jx = player->jx, jy = player->jy;
12364   int old_jx = jx, old_jy = jy;
12365   int moved = MP_NO_ACTION;
12366
12367   if (!player->active)
12368     return FALSE;
12369
12370   if (!dx && !dy)
12371   {
12372     if (player->MovPos == 0)
12373     {
12374       player->is_moving = FALSE;
12375       player->is_digging = FALSE;
12376       player->is_collecting = FALSE;
12377       player->is_snapping = FALSE;
12378       player->is_pushing = FALSE;
12379     }
12380
12381     return FALSE;
12382   }
12383
12384   if (player->move_delay > 0)
12385     return FALSE;
12386
12387   player->move_delay = -1;              /* set to "uninitialized" value */
12388
12389   /* store if player is automatically moved to next field */
12390   player->is_auto_moving = (player->programmed_action != MV_NONE);
12391
12392   /* remove the last programmed player action */
12393   player->programmed_action = 0;
12394
12395   if (player->MovPos)
12396   {
12397     /* should only happen if pre-1.2 tape recordings are played */
12398     /* this is only for backward compatibility */
12399
12400     int original_move_delay_value = player->move_delay_value;
12401
12402 #if DEBUG
12403     printf("THIS SHOULD ONLY HAPPEN WITH PRE-1.2 LEVEL TAPES. [%d]\n",
12404            tape.counter);
12405 #endif
12406
12407     /* scroll remaining steps with finest movement resolution */
12408     player->move_delay_value = MOVE_DELAY_NORMAL_SPEED;
12409
12410     while (player->MovPos)
12411     {
12412       ScrollPlayer(player, SCROLL_GO_ON);
12413       ScrollScreen(NULL, SCROLL_GO_ON);
12414
12415       AdvanceFrameAndPlayerCounters(player->index_nr);
12416
12417       DrawAllPlayers();
12418       BackToFront_WithFrameDelay(0);
12419     }
12420
12421     player->move_delay_value = original_move_delay_value;
12422   }
12423
12424   player->is_active = FALSE;
12425
12426   if (player->last_move_dir & MV_HORIZONTAL)
12427   {
12428     if (!(moved |= MovePlayerOneStep(player, 0, dy, dx, dy)))
12429       moved |= MovePlayerOneStep(player, dx, 0, dx, dy);
12430   }
12431   else
12432   {
12433     if (!(moved |= MovePlayerOneStep(player, dx, 0, dx, dy)))
12434       moved |= MovePlayerOneStep(player, 0, dy, dx, dy);
12435   }
12436
12437   if (!moved && !player->is_active)
12438   {
12439     player->is_moving = FALSE;
12440     player->is_digging = FALSE;
12441     player->is_collecting = FALSE;
12442     player->is_snapping = FALSE;
12443     player->is_pushing = FALSE;
12444   }
12445
12446   jx = player->jx;
12447   jy = player->jy;
12448
12449   if (moved & MP_MOVING && !ScreenMovPos &&
12450       (player->index_nr == game.centered_player_nr ||
12451        game.centered_player_nr == -1))
12452   {
12453     int old_scroll_x = scroll_x, old_scroll_y = scroll_y;
12454     int offset = game.scroll_delay_value;
12455
12456     if (!IN_VIS_FIELD(SCREENX(jx), SCREENY(jy)))
12457     {
12458       /* actual player has left the screen -- scroll in that direction */
12459       if (jx != old_jx)         /* player has moved horizontally */
12460         scroll_x += (jx - old_jx);
12461       else                      /* player has moved vertically */
12462         scroll_y += (jy - old_jy);
12463     }
12464     else
12465     {
12466       if (jx != old_jx)         /* player has moved horizontally */
12467       {
12468         if ((player->MovDir == MV_LEFT  && scroll_x > jx - MIDPOSX + offset) ||
12469             (player->MovDir == MV_RIGHT && scroll_x < jx - MIDPOSX - offset))
12470           scroll_x = jx-MIDPOSX + (scroll_x < jx-MIDPOSX ? -offset : +offset);
12471
12472         /* don't scroll over playfield boundaries */
12473         if (scroll_x < SBX_Left || scroll_x > SBX_Right)
12474           scroll_x = (scroll_x < SBX_Left ? SBX_Left : SBX_Right);
12475
12476         /* don't scroll more than one field at a time */
12477         scroll_x = old_scroll_x + SIGN(scroll_x - old_scroll_x);
12478
12479         /* don't scroll against the player's moving direction */
12480         if ((player->MovDir == MV_LEFT  && scroll_x > old_scroll_x) ||
12481             (player->MovDir == MV_RIGHT && scroll_x < old_scroll_x))
12482           scroll_x = old_scroll_x;
12483       }
12484       else                      /* player has moved vertically */
12485       {
12486         if ((player->MovDir == MV_UP   && scroll_y > jy - MIDPOSY + offset) ||
12487             (player->MovDir == MV_DOWN && scroll_y < jy - MIDPOSY - offset))
12488           scroll_y = jy-MIDPOSY + (scroll_y < jy-MIDPOSY ? -offset : +offset);
12489
12490         /* don't scroll over playfield boundaries */
12491         if (scroll_y < SBY_Upper || scroll_y > SBY_Lower)
12492           scroll_y = (scroll_y < SBY_Upper ? SBY_Upper : SBY_Lower);
12493
12494         /* don't scroll more than one field at a time */
12495         scroll_y = old_scroll_y + SIGN(scroll_y - old_scroll_y);
12496
12497         /* don't scroll against the player's moving direction */
12498         if ((player->MovDir == MV_UP   && scroll_y > old_scroll_y) ||
12499             (player->MovDir == MV_DOWN && scroll_y < old_scroll_y))
12500           scroll_y = old_scroll_y;
12501       }
12502     }
12503
12504     if (scroll_x != old_scroll_x || scroll_y != old_scroll_y)
12505     {
12506       if (!network.enabled && game.centered_player_nr == -1 &&
12507           !AllPlayersInVisibleScreen())
12508       {
12509         scroll_x = old_scroll_x;
12510         scroll_y = old_scroll_y;
12511       }
12512       else
12513       {
12514         ScrollScreen(player, SCROLL_INIT);
12515         ScrollLevel(old_scroll_x - scroll_x, old_scroll_y - scroll_y);
12516       }
12517     }
12518   }
12519
12520   player->StepFrame = 0;
12521
12522   if (moved & MP_MOVING)
12523   {
12524     if (old_jx != jx && old_jy == jy)
12525       player->MovDir = (old_jx < jx ? MV_RIGHT : MV_LEFT);
12526     else if (old_jx == jx && old_jy != jy)
12527       player->MovDir = (old_jy < jy ? MV_DOWN : MV_UP);
12528
12529     TEST_DrawLevelField(jx, jy);        /* for "crumbled sand" */
12530
12531     player->last_move_dir = player->MovDir;
12532     player->is_moving = TRUE;
12533     player->is_snapping = FALSE;
12534     player->is_switching = FALSE;
12535     player->is_dropping = FALSE;
12536     player->is_dropping_pressed = FALSE;
12537     player->drop_pressed_delay = 0;
12538
12539 #if 0
12540     /* should better be called here than above, but this breaks some tapes */
12541     ScrollPlayer(player, SCROLL_INIT);
12542 #endif
12543   }
12544   else
12545   {
12546     CheckGravityMovementWhenNotMoving(player);
12547
12548     player->is_moving = FALSE;
12549
12550     /* at this point, the player is allowed to move, but cannot move right now
12551        (e.g. because of something blocking the way) -- ensure that the player
12552        is also allowed to move in the next frame (in old versions before 3.1.1,
12553        the player was forced to wait again for eight frames before next try) */
12554
12555     if (game.engine_version >= VERSION_IDENT(3,1,1,0))
12556       player->move_delay = 0;   /* allow direct movement in the next frame */
12557   }
12558
12559   if (player->move_delay == -1)         /* not yet initialized by DigField() */
12560     player->move_delay = player->move_delay_value;
12561
12562   if (game.engine_version < VERSION_IDENT(3,0,7,0))
12563   {
12564     TestIfPlayerTouchesBadThing(jx, jy);
12565     TestIfPlayerTouchesCustomElement(jx, jy);
12566   }
12567
12568   if (!player->active)
12569     RemovePlayer(player);
12570
12571   return moved;
12572 }
12573
12574 void ScrollPlayer(struct PlayerInfo *player, int mode)
12575 {
12576   int jx = player->jx, jy = player->jy;
12577   int last_jx = player->last_jx, last_jy = player->last_jy;
12578   int move_stepsize = TILEX / player->move_delay_value;
12579
12580   if (!player->active)
12581     return;
12582
12583   if (player->MovPos == 0 && mode == SCROLL_GO_ON)      /* player not moving */
12584     return;
12585
12586   if (mode == SCROLL_INIT)
12587   {
12588     player->actual_frame_counter = FrameCounter;
12589     player->GfxPos = move_stepsize * (player->MovPos / move_stepsize);
12590
12591     if ((player->block_last_field || player->block_delay_adjustment > 0) &&
12592         Feld[last_jx][last_jy] == EL_EMPTY)
12593     {
12594       int last_field_block_delay = 0;   /* start with no blocking at all */
12595       int block_delay_adjustment = player->block_delay_adjustment;
12596
12597       /* if player blocks last field, add delay for exactly one move */
12598       if (player->block_last_field)
12599       {
12600         last_field_block_delay += player->move_delay_value;
12601
12602         /* when blocking enabled, prevent moving up despite gravity */
12603         if (player->gravity && player->MovDir == MV_UP)
12604           block_delay_adjustment = -1;
12605       }
12606
12607       /* add block delay adjustment (also possible when not blocking) */
12608       last_field_block_delay += block_delay_adjustment;
12609
12610       Feld[last_jx][last_jy] = EL_PLAYER_IS_LEAVING;
12611       MovDelay[last_jx][last_jy] = last_field_block_delay + 1;
12612     }
12613
12614     if (player->MovPos != 0)    /* player has not yet reached destination */
12615       return;
12616   }
12617   else if (!FrameReached(&player->actual_frame_counter, 1))
12618     return;
12619
12620   if (player->MovPos != 0)
12621   {
12622     player->MovPos += (player->MovPos > 0 ? -1 : 1) * move_stepsize;
12623     player->GfxPos = move_stepsize * (player->MovPos / move_stepsize);
12624
12625     /* before DrawPlayer() to draw correct player graphic for this case */
12626     if (player->MovPos == 0)
12627       CheckGravityMovement(player);
12628   }
12629
12630   if (player->MovPos == 0)      /* player reached destination field */
12631   {
12632     if (player->move_delay_reset_counter > 0)
12633     {
12634       player->move_delay_reset_counter--;
12635
12636       if (player->move_delay_reset_counter == 0)
12637       {
12638         /* continue with normal speed after quickly moving through gate */
12639         HALVE_PLAYER_SPEED(player);
12640
12641         /* be able to make the next move without delay */
12642         player->move_delay = 0;
12643       }
12644     }
12645
12646     player->last_jx = jx;
12647     player->last_jy = jy;
12648
12649     if (Feld[jx][jy] == EL_EXIT_OPEN ||
12650         Feld[jx][jy] == EL_EM_EXIT_OPEN ||
12651         Feld[jx][jy] == EL_EM_EXIT_OPENING ||
12652         Feld[jx][jy] == EL_STEEL_EXIT_OPEN ||
12653         Feld[jx][jy] == EL_EM_STEEL_EXIT_OPEN ||
12654         Feld[jx][jy] == EL_EM_STEEL_EXIT_OPENING ||
12655         Feld[jx][jy] == EL_SP_EXIT_OPEN ||
12656         Feld[jx][jy] == EL_SP_EXIT_OPENING)     /* <-- special case */
12657     {
12658       ExitPlayer(player);
12659
12660       if ((local_player->friends_still_needed == 0 ||
12661            IS_SP_ELEMENT(Feld[jx][jy])) &&
12662           AllPlayersGone)
12663         PlayerWins(local_player);
12664     }
12665
12666     /* this breaks one level: "machine", level 000 */
12667     {
12668       int move_direction = player->MovDir;
12669       int enter_side = MV_DIR_OPPOSITE(move_direction);
12670       int leave_side = move_direction;
12671       int old_jx = last_jx;
12672       int old_jy = last_jy;
12673       int old_element = Feld[old_jx][old_jy];
12674       int new_element = Feld[jx][jy];
12675
12676       if (IS_CUSTOM_ELEMENT(old_element))
12677         CheckElementChangeByPlayer(old_jx, old_jy, old_element,
12678                                    CE_LEFT_BY_PLAYER,
12679                                    player->index_bit, leave_side);
12680
12681       CheckTriggeredElementChangeByPlayer(old_jx, old_jy, old_element,
12682                                           CE_PLAYER_LEAVES_X,
12683                                           player->index_bit, leave_side);
12684
12685       if (IS_CUSTOM_ELEMENT(new_element))
12686         CheckElementChangeByPlayer(jx, jy, new_element, CE_ENTERED_BY_PLAYER,
12687                                    player->index_bit, enter_side);
12688
12689       CheckTriggeredElementChangeByPlayer(jx, jy, new_element,
12690                                           CE_PLAYER_ENTERS_X,
12691                                           player->index_bit, enter_side);
12692
12693       CheckTriggeredElementChangeBySide(jx, jy, player->initial_element,
12694                                         CE_MOVE_OF_X, move_direction);
12695     }
12696
12697     if (game.engine_version >= VERSION_IDENT(3,0,7,0))
12698     {
12699       TestIfPlayerTouchesBadThing(jx, jy);
12700       TestIfPlayerTouchesCustomElement(jx, jy);
12701
12702       /* needed because pushed element has not yet reached its destination,
12703          so it would trigger a change event at its previous field location */
12704       if (!player->is_pushing)
12705         TestIfElementTouchesCustomElement(jx, jy);      /* for empty space */
12706
12707       if (!player->active)
12708         RemovePlayer(player);
12709     }
12710
12711     if (!local_player->LevelSolved && level.use_step_counter)
12712     {
12713       int i;
12714
12715       TimePlayed++;
12716
12717       if (TimeLeft > 0)
12718       {
12719         TimeLeft--;
12720
12721         if (TimeLeft <= 10 && setup.time_limit)
12722           PlaySound(SND_GAME_RUNNING_OUT_OF_TIME);
12723
12724         game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
12725
12726         DisplayGameControlValues();
12727
12728         if (!TimeLeft && setup.time_limit)
12729           for (i = 0; i < MAX_PLAYERS; i++)
12730             KillPlayer(&stored_player[i]);
12731       }
12732       else if (game.no_time_limit && !AllPlayersGone) /* level w/o time limit */
12733       {
12734         game_panel_controls[GAME_PANEL_TIME].value = TimePlayed;
12735
12736         DisplayGameControlValues();
12737       }
12738     }
12739
12740     if (tape.single_step && tape.recording && !tape.pausing &&
12741         !player->programmed_action)
12742       TapeTogglePause(TAPE_TOGGLE_AUTOMATIC);
12743
12744     if (!player->programmed_action)
12745       CheckSaveEngineSnapshot(player);
12746   }
12747 }
12748
12749 void ScrollScreen(struct PlayerInfo *player, int mode)
12750 {
12751   static unsigned int screen_frame_counter = 0;
12752
12753   if (mode == SCROLL_INIT)
12754   {
12755     /* set scrolling step size according to actual player's moving speed */
12756     ScrollStepSize = TILEX / player->move_delay_value;
12757
12758     screen_frame_counter = FrameCounter;
12759     ScreenMovDir = player->MovDir;
12760     ScreenMovPos = player->MovPos;
12761     ScreenGfxPos = ScrollStepSize * (ScreenMovPos / ScrollStepSize);
12762     return;
12763   }
12764   else if (!FrameReached(&screen_frame_counter, 1))
12765     return;
12766
12767   if (ScreenMovPos)
12768   {
12769     ScreenMovPos += (ScreenMovPos > 0 ? -1 : 1) * ScrollStepSize;
12770     ScreenGfxPos = ScrollStepSize * (ScreenMovPos / ScrollStepSize);
12771     redraw_mask |= REDRAW_FIELD;
12772   }
12773   else
12774     ScreenMovDir = MV_NONE;
12775 }
12776
12777 void TestIfPlayerTouchesCustomElement(int x, int y)
12778 {
12779   static int xy[4][2] =
12780   {
12781     { 0, -1 },
12782     { -1, 0 },
12783     { +1, 0 },
12784     { 0, +1 }
12785   };
12786   static int trigger_sides[4][2] =
12787   {
12788     /* center side       border side */
12789     { CH_SIDE_TOP,      CH_SIDE_BOTTOM  },      /* check top    */
12790     { CH_SIDE_LEFT,     CH_SIDE_RIGHT   },      /* check left   */
12791     { CH_SIDE_RIGHT,    CH_SIDE_LEFT    },      /* check right  */
12792     { CH_SIDE_BOTTOM,   CH_SIDE_TOP     }       /* check bottom */
12793   };
12794   static int touch_dir[4] =
12795   {
12796     MV_LEFT | MV_RIGHT,
12797     MV_UP   | MV_DOWN,
12798     MV_UP   | MV_DOWN,
12799     MV_LEFT | MV_RIGHT
12800   };
12801   int center_element = Feld[x][y];      /* should always be non-moving! */
12802   int i;
12803
12804   for (i = 0; i < NUM_DIRECTIONS; i++)
12805   {
12806     int xx = x + xy[i][0];
12807     int yy = y + xy[i][1];
12808     int center_side = trigger_sides[i][0];
12809     int border_side = trigger_sides[i][1];
12810     int border_element;
12811
12812     if (!IN_LEV_FIELD(xx, yy))
12813       continue;
12814
12815     if (IS_PLAYER(x, y))                /* player found at center element */
12816     {
12817       struct PlayerInfo *player = PLAYERINFO(x, y);
12818
12819       if (game.engine_version < VERSION_IDENT(3,0,7,0))
12820         border_element = Feld[xx][yy];          /* may be moving! */
12821       else if (!IS_MOVING(xx, yy) && !IS_BLOCKED(xx, yy))
12822         border_element = Feld[xx][yy];
12823       else if (MovDir[xx][yy] & touch_dir[i])   /* elements are touching */
12824         border_element = MovingOrBlocked2Element(xx, yy);
12825       else
12826         continue;               /* center and border element do not touch */
12827
12828       CheckElementChangeByPlayer(xx, yy, border_element, CE_TOUCHED_BY_PLAYER,
12829                                  player->index_bit, border_side);
12830       CheckTriggeredElementChangeByPlayer(xx, yy, border_element,
12831                                           CE_PLAYER_TOUCHES_X,
12832                                           player->index_bit, border_side);
12833
12834       {
12835         /* use player element that is initially defined in the level playfield,
12836            not the player element that corresponds to the runtime player number
12837            (example: a level that contains EL_PLAYER_3 as the only player would
12838            incorrectly give EL_PLAYER_1 for "player->element_nr") */
12839         int player_element = PLAYERINFO(x, y)->initial_element;
12840
12841         CheckElementChangeBySide(xx, yy, border_element, player_element,
12842                                  CE_TOUCHING_X, border_side);
12843       }
12844     }
12845     else if (IS_PLAYER(xx, yy))         /* player found at border element */
12846     {
12847       struct PlayerInfo *player = PLAYERINFO(xx, yy);
12848
12849       if (game.engine_version >= VERSION_IDENT(3,0,7,0))
12850       {
12851         if (player->MovPos != 0 && !(player->MovDir & touch_dir[i]))
12852           continue;             /* center and border element do not touch */
12853       }
12854
12855       CheckElementChangeByPlayer(x, y, center_element, CE_TOUCHED_BY_PLAYER,
12856                                  player->index_bit, center_side);
12857       CheckTriggeredElementChangeByPlayer(x, y, center_element,
12858                                           CE_PLAYER_TOUCHES_X,
12859                                           player->index_bit, center_side);
12860
12861       {
12862         /* use player element that is initially defined in the level playfield,
12863            not the player element that corresponds to the runtime player number
12864            (example: a level that contains EL_PLAYER_3 as the only player would
12865            incorrectly give EL_PLAYER_1 for "player->element_nr") */
12866         int player_element = PLAYERINFO(xx, yy)->initial_element;
12867
12868         CheckElementChangeBySide(x, y, center_element, player_element,
12869                                  CE_TOUCHING_X, center_side);
12870       }
12871
12872       break;
12873     }
12874   }
12875 }
12876
12877 void TestIfElementTouchesCustomElement(int x, int y)
12878 {
12879   static int xy[4][2] =
12880   {
12881     { 0, -1 },
12882     { -1, 0 },
12883     { +1, 0 },
12884     { 0, +1 }
12885   };
12886   static int trigger_sides[4][2] =
12887   {
12888     /* center side      border side */
12889     { CH_SIDE_TOP,      CH_SIDE_BOTTOM  },      /* check top    */
12890     { CH_SIDE_LEFT,     CH_SIDE_RIGHT   },      /* check left   */
12891     { CH_SIDE_RIGHT,    CH_SIDE_LEFT    },      /* check right  */
12892     { CH_SIDE_BOTTOM,   CH_SIDE_TOP     }       /* check bottom */
12893   };
12894   static int touch_dir[4] =
12895   {
12896     MV_LEFT | MV_RIGHT,
12897     MV_UP   | MV_DOWN,
12898     MV_UP   | MV_DOWN,
12899     MV_LEFT | MV_RIGHT
12900   };
12901   boolean change_center_element = FALSE;
12902   int center_element = Feld[x][y];      /* should always be non-moving! */
12903   int border_element_old[NUM_DIRECTIONS];
12904   int i;
12905
12906   for (i = 0; i < NUM_DIRECTIONS; i++)
12907   {
12908     int xx = x + xy[i][0];
12909     int yy = y + xy[i][1];
12910     int border_element;
12911
12912     border_element_old[i] = -1;
12913
12914     if (!IN_LEV_FIELD(xx, yy))
12915       continue;
12916
12917     if (game.engine_version < VERSION_IDENT(3,0,7,0))
12918       border_element = Feld[xx][yy];    /* may be moving! */
12919     else if (!IS_MOVING(xx, yy) && !IS_BLOCKED(xx, yy))
12920       border_element = Feld[xx][yy];
12921     else if (MovDir[xx][yy] & touch_dir[i])     /* elements are touching */
12922       border_element = MovingOrBlocked2Element(xx, yy);
12923     else
12924       continue;                 /* center and border element do not touch */
12925
12926     border_element_old[i] = border_element;
12927   }
12928
12929   for (i = 0; i < NUM_DIRECTIONS; i++)
12930   {
12931     int xx = x + xy[i][0];
12932     int yy = y + xy[i][1];
12933     int center_side = trigger_sides[i][0];
12934     int border_element = border_element_old[i];
12935
12936     if (border_element == -1)
12937       continue;
12938
12939     /* check for change of border element */
12940     CheckElementChangeBySide(xx, yy, border_element, center_element,
12941                              CE_TOUCHING_X, center_side);
12942
12943     /* (center element cannot be player, so we dont have to check this here) */
12944   }
12945
12946   for (i = 0; i < NUM_DIRECTIONS; i++)
12947   {
12948     int xx = x + xy[i][0];
12949     int yy = y + xy[i][1];
12950     int border_side = trigger_sides[i][1];
12951     int border_element = border_element_old[i];
12952
12953     if (border_element == -1)
12954       continue;
12955
12956     /* check for change of center element (but change it only once) */
12957     if (!change_center_element)
12958       change_center_element =
12959         CheckElementChangeBySide(x, y, center_element, border_element,
12960                                  CE_TOUCHING_X, border_side);
12961
12962     if (IS_PLAYER(xx, yy))
12963     {
12964       /* use player element that is initially defined in the level playfield,
12965          not the player element that corresponds to the runtime player number
12966          (example: a level that contains EL_PLAYER_3 as the only player would
12967          incorrectly give EL_PLAYER_1 for "player->element_nr") */
12968       int player_element = PLAYERINFO(xx, yy)->initial_element;
12969
12970       CheckElementChangeBySide(x, y, center_element, player_element,
12971                                CE_TOUCHING_X, border_side);
12972     }
12973   }
12974 }
12975
12976 void TestIfElementHitsCustomElement(int x, int y, int direction)
12977 {
12978   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
12979   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
12980   int hitx = x + dx, hity = y + dy;
12981   int hitting_element = Feld[x][y];
12982   int touched_element;
12983
12984   if (IN_LEV_FIELD(hitx, hity) && IS_FREE(hitx, hity))
12985     return;
12986
12987   touched_element = (IN_LEV_FIELD(hitx, hity) ?
12988                      MovingOrBlocked2Element(hitx, hity) : EL_STEELWALL);
12989
12990   if (IN_LEV_FIELD(hitx, hity))
12991   {
12992     int opposite_direction = MV_DIR_OPPOSITE(direction);
12993     int hitting_side = direction;
12994     int touched_side = opposite_direction;
12995     boolean object_hit = (!IS_MOVING(hitx, hity) ||
12996                           MovDir[hitx][hity] != direction ||
12997                           ABS(MovPos[hitx][hity]) <= TILEY / 2);
12998
12999     object_hit = TRUE;
13000
13001     if (object_hit)
13002     {
13003       CheckElementChangeBySide(x, y, hitting_element, touched_element,
13004                                CE_HITTING_X, touched_side);
13005
13006       CheckElementChangeBySide(hitx, hity, touched_element, hitting_element,
13007                                CE_HIT_BY_X, hitting_side);
13008
13009       CheckElementChangeBySide(hitx, hity, touched_element, hitting_element,
13010                                CE_HIT_BY_SOMETHING, opposite_direction);
13011
13012       if (IS_PLAYER(hitx, hity))
13013       {
13014         /* use player element that is initially defined in the level playfield,
13015            not the player element that corresponds to the runtime player number
13016            (example: a level that contains EL_PLAYER_3 as the only player would
13017            incorrectly give EL_PLAYER_1 for "player->element_nr") */
13018         int player_element = PLAYERINFO(hitx, hity)->initial_element;
13019
13020         CheckElementChangeBySide(x, y, hitting_element, player_element,
13021                                  CE_HITTING_X, touched_side);
13022       }
13023     }
13024   }
13025
13026   /* "hitting something" is also true when hitting the playfield border */
13027   CheckElementChangeBySide(x, y, hitting_element, touched_element,
13028                            CE_HITTING_SOMETHING, direction);
13029 }
13030
13031 void TestIfGoodThingHitsBadThing(int good_x, int good_y, int good_move_dir)
13032 {
13033   int i, kill_x = -1, kill_y = -1;
13034
13035   int bad_element = -1;
13036   static int test_xy[4][2] =
13037   {
13038     { 0, -1 },
13039     { -1, 0 },
13040     { +1, 0 },
13041     { 0, +1 }
13042   };
13043   static int test_dir[4] =
13044   {
13045     MV_UP,
13046     MV_LEFT,
13047     MV_RIGHT,
13048     MV_DOWN
13049   };
13050
13051   for (i = 0; i < NUM_DIRECTIONS; i++)
13052   {
13053     int test_x, test_y, test_move_dir, test_element;
13054
13055     test_x = good_x + test_xy[i][0];
13056     test_y = good_y + test_xy[i][1];
13057
13058     if (!IN_LEV_FIELD(test_x, test_y))
13059       continue;
13060
13061     test_move_dir =
13062       (IS_MOVING(test_x, test_y) ? MovDir[test_x][test_y] : MV_NONE);
13063
13064     test_element = MovingOrBlocked2ElementIfNotLeaving(test_x, test_y);
13065
13066     /* 1st case: good thing is moving towards DONT_RUN_INTO style bad thing;
13067        2nd case: DONT_TOUCH style bad thing does not move away from good thing
13068     */
13069     if ((DONT_RUN_INTO(test_element) && good_move_dir == test_dir[i]) ||
13070         (DONT_TOUCH(test_element)    && test_move_dir != test_dir[i]))
13071     {
13072       kill_x = test_x;
13073       kill_y = test_y;
13074       bad_element = test_element;
13075
13076       break;
13077     }
13078   }
13079
13080   if (kill_x != -1 || kill_y != -1)
13081   {
13082     if (IS_PLAYER(good_x, good_y))
13083     {
13084       struct PlayerInfo *player = PLAYERINFO(good_x, good_y);
13085
13086       if (player->shield_deadly_time_left > 0 &&
13087           !IS_INDESTRUCTIBLE(bad_element))
13088         Bang(kill_x, kill_y);
13089       else if (!PLAYER_ENEMY_PROTECTED(good_x, good_y))
13090         KillPlayer(player);
13091     }
13092     else
13093       Bang(good_x, good_y);
13094   }
13095 }
13096
13097 void TestIfBadThingHitsGoodThing(int bad_x, int bad_y, int bad_move_dir)
13098 {
13099   int i, kill_x = -1, kill_y = -1;
13100   int bad_element = Feld[bad_x][bad_y];
13101   static int test_xy[4][2] =
13102   {
13103     { 0, -1 },
13104     { -1, 0 },
13105     { +1, 0 },
13106     { 0, +1 }
13107   };
13108   static int touch_dir[4] =
13109   {
13110     MV_LEFT | MV_RIGHT,
13111     MV_UP   | MV_DOWN,
13112     MV_UP   | MV_DOWN,
13113     MV_LEFT | MV_RIGHT
13114   };
13115   static int test_dir[4] =
13116   {
13117     MV_UP,
13118     MV_LEFT,
13119     MV_RIGHT,
13120     MV_DOWN
13121   };
13122
13123   if (bad_element == EL_EXPLOSION)      /* skip just exploding bad things */
13124     return;
13125
13126   for (i = 0; i < NUM_DIRECTIONS; i++)
13127   {
13128     int test_x, test_y, test_move_dir, test_element;
13129
13130     test_x = bad_x + test_xy[i][0];
13131     test_y = bad_y + test_xy[i][1];
13132
13133     if (!IN_LEV_FIELD(test_x, test_y))
13134       continue;
13135
13136     test_move_dir =
13137       (IS_MOVING(test_x, test_y) ? MovDir[test_x][test_y] : MV_NONE);
13138
13139     test_element = Feld[test_x][test_y];
13140
13141     /* 1st case: good thing is moving towards DONT_RUN_INTO style bad thing;
13142        2nd case: DONT_TOUCH style bad thing does not move away from good thing
13143     */
13144     if ((DONT_RUN_INTO(bad_element) &&  bad_move_dir == test_dir[i]) ||
13145         (DONT_TOUCH(bad_element)    && test_move_dir != test_dir[i]))
13146     {
13147       /* good thing is player or penguin that does not move away */
13148       if (IS_PLAYER(test_x, test_y))
13149       {
13150         struct PlayerInfo *player = PLAYERINFO(test_x, test_y);
13151
13152         if (bad_element == EL_ROBOT && player->is_moving)
13153           continue;     /* robot does not kill player if he is moving */
13154
13155         if (game.engine_version >= VERSION_IDENT(3,0,7,0))
13156         {
13157           if (player->MovPos != 0 && !(player->MovDir & touch_dir[i]))
13158             continue;           /* center and border element do not touch */
13159         }
13160
13161         kill_x = test_x;
13162         kill_y = test_y;
13163
13164         break;
13165       }
13166       else if (test_element == EL_PENGUIN)
13167       {
13168         kill_x = test_x;
13169         kill_y = test_y;
13170
13171         break;
13172       }
13173     }
13174   }
13175
13176   if (kill_x != -1 || kill_y != -1)
13177   {
13178     if (IS_PLAYER(kill_x, kill_y))
13179     {
13180       struct PlayerInfo *player = PLAYERINFO(kill_x, kill_y);
13181
13182       if (player->shield_deadly_time_left > 0 &&
13183           !IS_INDESTRUCTIBLE(bad_element))
13184         Bang(bad_x, bad_y);
13185       else if (!PLAYER_ENEMY_PROTECTED(kill_x, kill_y))
13186         KillPlayer(player);
13187     }
13188     else
13189       Bang(kill_x, kill_y);
13190   }
13191 }
13192
13193 void TestIfGoodThingGetsHitByBadThing(int bad_x, int bad_y, int bad_move_dir)
13194 {
13195   int bad_element = Feld[bad_x][bad_y];
13196   int dx = (bad_move_dir == MV_LEFT ? -1 : bad_move_dir == MV_RIGHT ? +1 : 0);
13197   int dy = (bad_move_dir == MV_UP   ? -1 : bad_move_dir == MV_DOWN  ? +1 : 0);
13198   int test_x = bad_x + dx, test_y = bad_y + dy;
13199   int test_move_dir, test_element;
13200   int kill_x = -1, kill_y = -1;
13201
13202   if (!IN_LEV_FIELD(test_x, test_y))
13203     return;
13204
13205   test_move_dir =
13206     (IS_MOVING(test_x, test_y) ? MovDir[test_x][test_y] : MV_NONE);
13207
13208   test_element = Feld[test_x][test_y];
13209
13210   if (test_move_dir != bad_move_dir)
13211   {
13212     /* good thing can be player or penguin that does not move away */
13213     if (IS_PLAYER(test_x, test_y))
13214     {
13215       struct PlayerInfo *player = PLAYERINFO(test_x, test_y);
13216
13217       /* (note: in comparison to DONT_RUN_TO and DONT_TOUCH, also handle the
13218          player as being hit when he is moving towards the bad thing, because
13219          the "get hit by" condition would be lost after the player stops) */
13220       if (player->MovPos != 0 && player->MovDir == bad_move_dir)
13221         return;         /* player moves away from bad thing */
13222
13223       kill_x = test_x;
13224       kill_y = test_y;
13225     }
13226     else if (test_element == EL_PENGUIN)
13227     {
13228       kill_x = test_x;
13229       kill_y = test_y;
13230     }
13231   }
13232
13233   if (kill_x != -1 || kill_y != -1)
13234   {
13235     if (IS_PLAYER(kill_x, kill_y))
13236     {
13237       struct PlayerInfo *player = PLAYERINFO(kill_x, kill_y);
13238
13239       if (player->shield_deadly_time_left > 0 &&
13240           !IS_INDESTRUCTIBLE(bad_element))
13241         Bang(bad_x, bad_y);
13242       else if (!PLAYER_ENEMY_PROTECTED(kill_x, kill_y))
13243         KillPlayer(player);
13244     }
13245     else
13246       Bang(kill_x, kill_y);
13247   }
13248 }
13249
13250 void TestIfPlayerTouchesBadThing(int x, int y)
13251 {
13252   TestIfGoodThingHitsBadThing(x, y, MV_NONE);
13253 }
13254
13255 void TestIfPlayerRunsIntoBadThing(int x, int y, int move_dir)
13256 {
13257   TestIfGoodThingHitsBadThing(x, y, move_dir);
13258 }
13259
13260 void TestIfBadThingTouchesPlayer(int x, int y)
13261 {
13262   TestIfBadThingHitsGoodThing(x, y, MV_NONE);
13263 }
13264
13265 void TestIfBadThingRunsIntoPlayer(int x, int y, int move_dir)
13266 {
13267   TestIfBadThingHitsGoodThing(x, y, move_dir);
13268 }
13269
13270 void TestIfFriendTouchesBadThing(int x, int y)
13271 {
13272   TestIfGoodThingHitsBadThing(x, y, MV_NONE);
13273 }
13274
13275 void TestIfBadThingTouchesFriend(int x, int y)
13276 {
13277   TestIfBadThingHitsGoodThing(x, y, MV_NONE);
13278 }
13279
13280 void TestIfBadThingTouchesOtherBadThing(int bad_x, int bad_y)
13281 {
13282   int i, kill_x = bad_x, kill_y = bad_y;
13283   static int xy[4][2] =
13284   {
13285     { 0, -1 },
13286     { -1, 0 },
13287     { +1, 0 },
13288     { 0, +1 }
13289   };
13290
13291   for (i = 0; i < NUM_DIRECTIONS; i++)
13292   {
13293     int x, y, element;
13294
13295     x = bad_x + xy[i][0];
13296     y = bad_y + xy[i][1];
13297     if (!IN_LEV_FIELD(x, y))
13298       continue;
13299
13300     element = Feld[x][y];
13301     if (IS_AMOEBOID(element) || element == EL_GAME_OF_LIFE ||
13302         element == EL_AMOEBA_GROWING || element == EL_AMOEBA_DROP)
13303     {
13304       kill_x = x;
13305       kill_y = y;
13306       break;
13307     }
13308   }
13309
13310   if (kill_x != bad_x || kill_y != bad_y)
13311     Bang(bad_x, bad_y);
13312 }
13313
13314 void KillPlayer(struct PlayerInfo *player)
13315 {
13316   int jx = player->jx, jy = player->jy;
13317
13318   if (!player->active)
13319     return;
13320
13321 #if 0
13322   printf("::: 0: killed == %d, active == %d, reanimated == %d\n",
13323          player->killed, player->active, player->reanimated);
13324 #endif
13325
13326   /* the following code was introduced to prevent an infinite loop when calling
13327      -> Bang()
13328      -> CheckTriggeredElementChangeExt()
13329      -> ExecuteCustomElementAction()
13330      -> KillPlayer()
13331      -> (infinitely repeating the above sequence of function calls)
13332      which occurs when killing the player while having a CE with the setting
13333      "kill player X when explosion of <player X>"; the solution using a new
13334      field "player->killed" was chosen for backwards compatibility, although
13335      clever use of the fields "player->active" etc. would probably also work */
13336 #if 1
13337   if (player->killed)
13338     return;
13339 #endif
13340
13341   player->killed = TRUE;
13342
13343   /* remove accessible field at the player's position */
13344   Feld[jx][jy] = EL_EMPTY;
13345
13346   /* deactivate shield (else Bang()/Explode() would not work right) */
13347   player->shield_normal_time_left = 0;
13348   player->shield_deadly_time_left = 0;
13349
13350 #if 0
13351   printf("::: 1: killed == %d, active == %d, reanimated == %d\n",
13352          player->killed, player->active, player->reanimated);
13353 #endif
13354
13355   Bang(jx, jy);
13356
13357 #if 0
13358   printf("::: 2: killed == %d, active == %d, reanimated == %d\n",
13359          player->killed, player->active, player->reanimated);
13360 #endif
13361
13362   if (player->reanimated)       /* killed player may have been reanimated */
13363     player->killed = player->reanimated = FALSE;
13364   else
13365     BuryPlayer(player);
13366 }
13367
13368 static void KillPlayerUnlessEnemyProtected(int x, int y)
13369 {
13370   if (!PLAYER_ENEMY_PROTECTED(x, y))
13371     KillPlayer(PLAYERINFO(x, y));
13372 }
13373
13374 static void KillPlayerUnlessExplosionProtected(int x, int y)
13375 {
13376   if (!PLAYER_EXPLOSION_PROTECTED(x, y))
13377     KillPlayer(PLAYERINFO(x, y));
13378 }
13379
13380 void BuryPlayer(struct PlayerInfo *player)
13381 {
13382   int jx = player->jx, jy = player->jy;
13383
13384   if (!player->active)
13385     return;
13386
13387   PlayLevelSoundElementAction(jx, jy, player->artwork_element, ACTION_DYING);
13388   PlayLevelSound(jx, jy, SND_GAME_LOSING);
13389
13390   player->GameOver = TRUE;
13391   RemovePlayer(player);
13392 }
13393
13394 void RemovePlayer(struct PlayerInfo *player)
13395 {
13396   int jx = player->jx, jy = player->jy;
13397   int i, found = FALSE;
13398
13399   player->present = FALSE;
13400   player->active = FALSE;
13401
13402   if (!ExplodeField[jx][jy])
13403     StorePlayer[jx][jy] = 0;
13404
13405   if (player->is_moving)
13406     TEST_DrawLevelField(player->last_jx, player->last_jy);
13407
13408   for (i = 0; i < MAX_PLAYERS; i++)
13409     if (stored_player[i].active)
13410       found = TRUE;
13411
13412   if (!found)
13413     AllPlayersGone = TRUE;
13414
13415   ExitX = ZX = jx;
13416   ExitY = ZY = jy;
13417 }
13418
13419 void ExitPlayer(struct PlayerInfo *player)
13420 {
13421   DrawPlayer(player);   /* needed here only to cleanup last field */
13422   RemovePlayer(player);
13423
13424   local_player->players_still_needed--;
13425 }
13426
13427 static void setFieldForSnapping(int x, int y, int element, int direction)
13428 {
13429   struct ElementInfo *ei = &element_info[element];
13430   int direction_bit = MV_DIR_TO_BIT(direction);
13431   int graphic_snapping = ei->direction_graphic[ACTION_SNAPPING][direction_bit];
13432   int action = (graphic_snapping != IMG_EMPTY_SPACE ? ACTION_SNAPPING :
13433                 IS_DIGGABLE(element) ? ACTION_DIGGING : ACTION_COLLECTING);
13434
13435   Feld[x][y] = EL_ELEMENT_SNAPPING;
13436   MovDelay[x][y] = MOVE_DELAY_NORMAL_SPEED + 1 - 1;
13437
13438   ResetGfxAnimation(x, y);
13439
13440   GfxElement[x][y] = element;
13441   GfxAction[x][y] = action;
13442   GfxDir[x][y] = direction;
13443   GfxFrame[x][y] = -1;
13444 }
13445
13446 /*
13447   =============================================================================
13448   checkDiagonalPushing()
13449   -----------------------------------------------------------------------------
13450   check if diagonal input device direction results in pushing of object
13451   (by checking if the alternative direction is walkable, diggable, ...)
13452   =============================================================================
13453 */
13454
13455 static boolean checkDiagonalPushing(struct PlayerInfo *player,
13456                                     int x, int y, int real_dx, int real_dy)
13457 {
13458   int jx, jy, dx, dy, xx, yy;
13459
13460   if (real_dx == 0 || real_dy == 0)     /* no diagonal direction => push */
13461     return TRUE;
13462
13463   /* diagonal direction: check alternative direction */
13464   jx = player->jx;
13465   jy = player->jy;
13466   dx = x - jx;
13467   dy = y - jy;
13468   xx = jx + (dx == 0 ? real_dx : 0);
13469   yy = jy + (dy == 0 ? real_dy : 0);
13470
13471   return (!IN_LEV_FIELD(xx, yy) || IS_SOLID_FOR_PUSHING(Feld[xx][yy]));
13472 }
13473
13474 /*
13475   =============================================================================
13476   DigField()
13477   -----------------------------------------------------------------------------
13478   x, y:                 field next to player (non-diagonal) to try to dig to
13479   real_dx, real_dy:     direction as read from input device (can be diagonal)
13480   =============================================================================
13481 */
13482
13483 static int DigField(struct PlayerInfo *player,
13484                     int oldx, int oldy, int x, int y,
13485                     int real_dx, int real_dy, int mode)
13486 {
13487   boolean is_player = (IS_PLAYER(oldx, oldy) || mode != DF_DIG);
13488   boolean player_was_pushing = player->is_pushing;
13489   boolean player_can_move = (!player->cannot_move && mode != DF_SNAP);
13490   boolean player_can_move_or_snap = (!player->cannot_move || mode == DF_SNAP);
13491   int jx = oldx, jy = oldy;
13492   int dx = x - jx, dy = y - jy;
13493   int nextx = x + dx, nexty = y + dy;
13494   int move_direction = (dx == -1 ? MV_LEFT  :
13495                         dx == +1 ? MV_RIGHT :
13496                         dy == -1 ? MV_UP    :
13497                         dy == +1 ? MV_DOWN  : MV_NONE);
13498   int opposite_direction = MV_DIR_OPPOSITE(move_direction);
13499   int dig_side = MV_DIR_OPPOSITE(move_direction);
13500   int old_element = Feld[jx][jy];
13501   int element = MovingOrBlocked2ElementIfNotLeaving(x, y);
13502   int collect_count;
13503
13504   if (is_player)                /* function can also be called by EL_PENGUIN */
13505   {
13506     if (player->MovPos == 0)
13507     {
13508       player->is_digging = FALSE;
13509       player->is_collecting = FALSE;
13510     }
13511
13512     if (player->MovPos == 0)    /* last pushing move finished */
13513       player->is_pushing = FALSE;
13514
13515     if (mode == DF_NO_PUSH)     /* player just stopped pushing */
13516     {
13517       player->is_switching = FALSE;
13518       player->push_delay = -1;
13519
13520       return MP_NO_ACTION;
13521     }
13522   }
13523
13524   if (IS_TUBE(Back[jx][jy]) && game.engine_version >= VERSION_IDENT(2,2,0,0))
13525     old_element = Back[jx][jy];
13526
13527   /* in case of element dropped at player position, check background */
13528   else if (Back[jx][jy] != EL_EMPTY &&
13529            game.engine_version >= VERSION_IDENT(2,2,0,0))
13530     old_element = Back[jx][jy];
13531
13532   if (IS_WALKABLE(old_element) && !ACCESS_FROM(old_element, move_direction))
13533     return MP_NO_ACTION;        /* field has no opening in this direction */
13534
13535   if (IS_PASSABLE(old_element) && !ACCESS_FROM(old_element,opposite_direction))
13536     return MP_NO_ACTION;        /* field has no opening in this direction */
13537
13538   if (player_can_move && element == EL_ACID && move_direction == MV_DOWN)
13539   {
13540     SplashAcid(x, y);
13541
13542     Feld[jx][jy] = player->artwork_element;
13543     InitMovingField(jx, jy, MV_DOWN);
13544     Store[jx][jy] = EL_ACID;
13545     ContinueMoving(jx, jy);
13546     BuryPlayer(player);
13547
13548     return MP_DONT_RUN_INTO;
13549   }
13550
13551   if (player_can_move && DONT_RUN_INTO(element))
13552   {
13553     TestIfPlayerRunsIntoBadThing(jx, jy, player->MovDir);
13554
13555     return MP_DONT_RUN_INTO;
13556   }
13557
13558   if (IS_MOVING(x, y) || IS_PLAYER(x, y))
13559     return MP_NO_ACTION;
13560
13561   collect_count = element_info[element].collect_count_initial;
13562
13563   if (!is_player && !IS_COLLECTIBLE(element))   /* penguin cannot collect it */
13564     return MP_NO_ACTION;
13565
13566   if (game.engine_version < VERSION_IDENT(2,2,0,0))
13567     player_can_move = player_can_move_or_snap;
13568
13569   if (mode == DF_SNAP && !IS_SNAPPABLE(element) &&
13570       game.engine_version >= VERSION_IDENT(2,2,0,0))
13571   {
13572     CheckElementChangeByPlayer(x, y, element, CE_SNAPPED_BY_PLAYER,
13573                                player->index_bit, dig_side);
13574     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SNAPS_X,
13575                                         player->index_bit, dig_side);
13576
13577     if (element == EL_DC_LANDMINE)
13578       Bang(x, y);
13579
13580     if (Feld[x][y] != element)          /* field changed by snapping */
13581       return MP_ACTION;
13582
13583     return MP_NO_ACTION;
13584   }
13585
13586   if (player->gravity && is_player && !player->is_auto_moving &&
13587       canFallDown(player) && move_direction != MV_DOWN &&
13588       !canMoveToValidFieldWithGravity(jx, jy, move_direction))
13589     return MP_NO_ACTION;        /* player cannot walk here due to gravity */
13590
13591   if (player_can_move &&
13592       IS_WALKABLE(element) && ACCESS_FROM(element, opposite_direction))
13593   {
13594     int sound_element = SND_ELEMENT(element);
13595     int sound_action = ACTION_WALKING;
13596
13597     if (IS_RND_GATE(element))
13598     {
13599       if (!player->key[RND_GATE_NR(element)])
13600         return MP_NO_ACTION;
13601     }
13602     else if (IS_RND_GATE_GRAY(element))
13603     {
13604       if (!player->key[RND_GATE_GRAY_NR(element)])
13605         return MP_NO_ACTION;
13606     }
13607     else if (IS_RND_GATE_GRAY_ACTIVE(element))
13608     {
13609       if (!player->key[RND_GATE_GRAY_ACTIVE_NR(element)])
13610         return MP_NO_ACTION;
13611     }
13612     else if (element == EL_EXIT_OPEN ||
13613              element == EL_EM_EXIT_OPEN ||
13614              element == EL_EM_EXIT_OPENING ||
13615              element == EL_STEEL_EXIT_OPEN ||
13616              element == EL_EM_STEEL_EXIT_OPEN ||
13617              element == EL_EM_STEEL_EXIT_OPENING ||
13618              element == EL_SP_EXIT_OPEN ||
13619              element == EL_SP_EXIT_OPENING)
13620     {
13621       sound_action = ACTION_PASSING;    /* player is passing exit */
13622     }
13623     else if (element == EL_EMPTY)
13624     {
13625       sound_action = ACTION_MOVING;             /* nothing to walk on */
13626     }
13627
13628     /* play sound from background or player, whatever is available */
13629     if (element_info[sound_element].sound[sound_action] != SND_UNDEFINED)
13630       PlayLevelSoundElementAction(x, y, sound_element, sound_action);
13631     else
13632       PlayLevelSoundElementAction(x, y, player->artwork_element, sound_action);
13633   }
13634   else if (player_can_move &&
13635            IS_PASSABLE(element) && canPassField(x, y, move_direction))
13636   {
13637     if (!ACCESS_FROM(element, opposite_direction))
13638       return MP_NO_ACTION;      /* field not accessible from this direction */
13639
13640     if (CAN_MOVE(element))      /* only fixed elements can be passed! */
13641       return MP_NO_ACTION;
13642
13643     if (IS_EM_GATE(element))
13644     {
13645       if (!player->key[EM_GATE_NR(element)])
13646         return MP_NO_ACTION;
13647     }
13648     else if (IS_EM_GATE_GRAY(element))
13649     {
13650       if (!player->key[EM_GATE_GRAY_NR(element)])
13651         return MP_NO_ACTION;
13652     }
13653     else if (IS_EM_GATE_GRAY_ACTIVE(element))
13654     {
13655       if (!player->key[EM_GATE_GRAY_ACTIVE_NR(element)])
13656         return MP_NO_ACTION;
13657     }
13658     else if (IS_EMC_GATE(element))
13659     {
13660       if (!player->key[EMC_GATE_NR(element)])
13661         return MP_NO_ACTION;
13662     }
13663     else if (IS_EMC_GATE_GRAY(element))
13664     {
13665       if (!player->key[EMC_GATE_GRAY_NR(element)])
13666         return MP_NO_ACTION;
13667     }
13668     else if (IS_EMC_GATE_GRAY_ACTIVE(element))
13669     {
13670       if (!player->key[EMC_GATE_GRAY_ACTIVE_NR(element)])
13671         return MP_NO_ACTION;
13672     }
13673     else if (element == EL_DC_GATE_WHITE ||
13674              element == EL_DC_GATE_WHITE_GRAY ||
13675              element == EL_DC_GATE_WHITE_GRAY_ACTIVE)
13676     {
13677       if (player->num_white_keys == 0)
13678         return MP_NO_ACTION;
13679
13680       player->num_white_keys--;
13681     }
13682     else if (IS_SP_PORT(element))
13683     {
13684       if (element == EL_SP_GRAVITY_PORT_LEFT ||
13685           element == EL_SP_GRAVITY_PORT_RIGHT ||
13686           element == EL_SP_GRAVITY_PORT_UP ||
13687           element == EL_SP_GRAVITY_PORT_DOWN)
13688         player->gravity = !player->gravity;
13689       else if (element == EL_SP_GRAVITY_ON_PORT_LEFT ||
13690                element == EL_SP_GRAVITY_ON_PORT_RIGHT ||
13691                element == EL_SP_GRAVITY_ON_PORT_UP ||
13692                element == EL_SP_GRAVITY_ON_PORT_DOWN)
13693         player->gravity = TRUE;
13694       else if (element == EL_SP_GRAVITY_OFF_PORT_LEFT ||
13695                element == EL_SP_GRAVITY_OFF_PORT_RIGHT ||
13696                element == EL_SP_GRAVITY_OFF_PORT_UP ||
13697                element == EL_SP_GRAVITY_OFF_PORT_DOWN)
13698         player->gravity = FALSE;
13699     }
13700
13701     /* automatically move to the next field with double speed */
13702     player->programmed_action = move_direction;
13703
13704     if (player->move_delay_reset_counter == 0)
13705     {
13706       player->move_delay_reset_counter = 2;     /* two double speed steps */
13707
13708       DOUBLE_PLAYER_SPEED(player);
13709     }
13710
13711     PlayLevelSoundAction(x, y, ACTION_PASSING);
13712   }
13713   else if (player_can_move_or_snap && IS_DIGGABLE(element))
13714   {
13715     RemoveField(x, y);
13716
13717     if (mode != DF_SNAP)
13718     {
13719       GfxElement[x][y] = GFX_ELEMENT(element);
13720       player->is_digging = TRUE;
13721     }
13722
13723     PlayLevelSoundElementAction(x, y, element, ACTION_DIGGING);
13724
13725     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_DIGS_X,
13726                                         player->index_bit, dig_side);
13727
13728     if (mode == DF_SNAP)
13729     {
13730       if (level.block_snap_field)
13731         setFieldForSnapping(x, y, element, move_direction);
13732       else
13733         TestIfElementTouchesCustomElement(x, y);        /* for empty space */
13734
13735       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SNAPS_X,
13736                                           player->index_bit, dig_side);
13737     }
13738   }
13739   else if (player_can_move_or_snap && IS_COLLECTIBLE(element))
13740   {
13741     RemoveField(x, y);
13742
13743     if (is_player && mode != DF_SNAP)
13744     {
13745       GfxElement[x][y] = element;
13746       player->is_collecting = TRUE;
13747     }
13748
13749     if (element == EL_SPEED_PILL)
13750     {
13751       player->move_delay_value = MOVE_DELAY_HIGH_SPEED;
13752     }
13753     else if (element == EL_EXTRA_TIME && level.time > 0)
13754     {
13755       TimeLeft += level.extra_time;
13756
13757       game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
13758
13759       DisplayGameControlValues();
13760     }
13761     else if (element == EL_SHIELD_NORMAL || element == EL_SHIELD_DEADLY)
13762     {
13763       player->shield_normal_time_left += level.shield_normal_time;
13764       if (element == EL_SHIELD_DEADLY)
13765         player->shield_deadly_time_left += level.shield_deadly_time;
13766     }
13767     else if (element == EL_DYNAMITE ||
13768              element == EL_EM_DYNAMITE ||
13769              element == EL_SP_DISK_RED)
13770     {
13771       if (player->inventory_size < MAX_INVENTORY_SIZE)
13772         player->inventory_element[player->inventory_size++] = element;
13773
13774       DrawGameDoorValues();
13775     }
13776     else if (element == EL_DYNABOMB_INCREASE_NUMBER)
13777     {
13778       player->dynabomb_count++;
13779       player->dynabombs_left++;
13780     }
13781     else if (element == EL_DYNABOMB_INCREASE_SIZE)
13782     {
13783       player->dynabomb_size++;
13784     }
13785     else if (element == EL_DYNABOMB_INCREASE_POWER)
13786     {
13787       player->dynabomb_xl = TRUE;
13788     }
13789     else if (IS_KEY(element))
13790     {
13791       player->key[KEY_NR(element)] = TRUE;
13792
13793       DrawGameDoorValues();
13794     }
13795     else if (element == EL_DC_KEY_WHITE)
13796     {
13797       player->num_white_keys++;
13798
13799       /* display white keys? */
13800       /* DrawGameDoorValues(); */
13801     }
13802     else if (IS_ENVELOPE(element))
13803     {
13804       player->show_envelope = element;
13805     }
13806     else if (element == EL_EMC_LENSES)
13807     {
13808       game.lenses_time_left = level.lenses_time * FRAMES_PER_SECOND;
13809
13810       RedrawAllInvisibleElementsForLenses();
13811     }
13812     else if (element == EL_EMC_MAGNIFIER)
13813     {
13814       game.magnify_time_left = level.magnify_time * FRAMES_PER_SECOND;
13815
13816       RedrawAllInvisibleElementsForMagnifier();
13817     }
13818     else if (IS_DROPPABLE(element) ||
13819              IS_THROWABLE(element))     /* can be collected and dropped */
13820     {
13821       int i;
13822
13823       if (collect_count == 0)
13824         player->inventory_infinite_element = element;
13825       else
13826         for (i = 0; i < collect_count; i++)
13827           if (player->inventory_size < MAX_INVENTORY_SIZE)
13828             player->inventory_element[player->inventory_size++] = element;
13829
13830       DrawGameDoorValues();
13831     }
13832     else if (collect_count > 0)
13833     {
13834       local_player->gems_still_needed -= collect_count;
13835       if (local_player->gems_still_needed < 0)
13836         local_player->gems_still_needed = 0;
13837
13838       game.snapshot.collected_item = TRUE;
13839
13840       game_panel_controls[GAME_PANEL_GEMS].value = local_player->gems_still_needed;
13841
13842       DisplayGameControlValues();
13843     }
13844
13845     RaiseScoreElement(element);
13846     PlayLevelSoundElementAction(x, y, element, ACTION_COLLECTING);
13847
13848     if (is_player)
13849       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_COLLECTS_X,
13850                                           player->index_bit, dig_side);
13851
13852     if (mode == DF_SNAP)
13853     {
13854       if (level.block_snap_field)
13855         setFieldForSnapping(x, y, element, move_direction);
13856       else
13857         TestIfElementTouchesCustomElement(x, y);        /* for empty space */
13858
13859       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SNAPS_X,
13860                                           player->index_bit, dig_side);
13861     }
13862   }
13863   else if (player_can_move_or_snap && IS_PUSHABLE(element))
13864   {
13865     if (mode == DF_SNAP && element != EL_BD_ROCK)
13866       return MP_NO_ACTION;
13867
13868     if (CAN_FALL(element) && dy)
13869       return MP_NO_ACTION;
13870
13871     if (CAN_FALL(element) && IN_LEV_FIELD(x, y + 1) && IS_FREE(x, y + 1) &&
13872         !(element == EL_SPRING && level.use_spring_bug))
13873       return MP_NO_ACTION;
13874
13875     if (CAN_MOVE(element) && GET_MAX_MOVE_DELAY(element) == 0 &&
13876         ((move_direction & MV_VERTICAL &&
13877           ((element_info[element].move_pattern & MV_LEFT &&
13878             IN_LEV_FIELD(x - 1, y) && IS_FREE(x - 1, y)) ||
13879            (element_info[element].move_pattern & MV_RIGHT &&
13880             IN_LEV_FIELD(x + 1, y) && IS_FREE(x + 1, y)))) ||
13881          (move_direction & MV_HORIZONTAL &&
13882           ((element_info[element].move_pattern & MV_UP &&
13883             IN_LEV_FIELD(x, y - 1) && IS_FREE(x, y - 1)) ||
13884            (element_info[element].move_pattern & MV_DOWN &&
13885             IN_LEV_FIELD(x, y + 1) && IS_FREE(x, y + 1))))))
13886       return MP_NO_ACTION;
13887
13888     /* do not push elements already moving away faster than player */
13889     if (CAN_MOVE(element) && MovDir[x][y] == move_direction &&
13890         ABS(getElementMoveStepsize(x, y)) > MOVE_STEPSIZE_NORMAL)
13891       return MP_NO_ACTION;
13892
13893     if (game.engine_version >= VERSION_IDENT(3,1,0,0))
13894     {
13895       if (player->push_delay_value == -1 || !player_was_pushing)
13896         player->push_delay_value = GET_NEW_PUSH_DELAY(element);
13897     }
13898     else if (game.engine_version >= VERSION_IDENT(3,0,7,1))
13899     {
13900       if (player->push_delay_value == -1)
13901         player->push_delay_value = GET_NEW_PUSH_DELAY(element);
13902     }
13903     else if (game.engine_version >= VERSION_IDENT(2,2,0,7))
13904     {
13905       if (!player->is_pushing)
13906         player->push_delay_value = GET_NEW_PUSH_DELAY(element);
13907     }
13908
13909     player->is_pushing = TRUE;
13910     player->is_active = TRUE;
13911
13912     if (!(IN_LEV_FIELD(nextx, nexty) &&
13913           (IS_FREE(nextx, nexty) ||
13914            (IS_SB_ELEMENT(element) &&
13915             Feld[nextx][nexty] == EL_SOKOBAN_FIELD_EMPTY) ||
13916            (IS_CUSTOM_ELEMENT(element) &&
13917             CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, nextx, nexty)))))
13918       return MP_NO_ACTION;
13919
13920     if (!checkDiagonalPushing(player, x, y, real_dx, real_dy))
13921       return MP_NO_ACTION;
13922
13923     if (player->push_delay == -1)       /* new pushing; restart delay */
13924       player->push_delay = 0;
13925
13926     if (player->push_delay < player->push_delay_value &&
13927         !(tape.playing && tape.file_version < FILE_VERSION_2_0) &&
13928         element != EL_SPRING && element != EL_BALLOON)
13929     {
13930       /* make sure that there is no move delay before next try to push */
13931       if (game.engine_version >= VERSION_IDENT(3,0,7,1))
13932         player->move_delay = 0;
13933
13934       return MP_NO_ACTION;
13935     }
13936
13937     if (IS_CUSTOM_ELEMENT(element) &&
13938         CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, nextx, nexty))
13939     {
13940       if (!DigFieldByCE(nextx, nexty, element))
13941         return MP_NO_ACTION;
13942     }
13943
13944     if (IS_SB_ELEMENT(element))
13945     {
13946       if (element == EL_SOKOBAN_FIELD_FULL)
13947       {
13948         Back[x][y] = EL_SOKOBAN_FIELD_EMPTY;
13949         local_player->sokobanfields_still_needed++;
13950       }
13951
13952       if (Feld[nextx][nexty] == EL_SOKOBAN_FIELD_EMPTY)
13953       {
13954         Back[nextx][nexty] = EL_SOKOBAN_FIELD_EMPTY;
13955         local_player->sokobanfields_still_needed--;
13956       }
13957
13958       Feld[x][y] = EL_SOKOBAN_OBJECT;
13959
13960       if (Back[x][y] == Back[nextx][nexty])
13961         PlayLevelSoundAction(x, y, ACTION_PUSHING);
13962       else if (Back[x][y] != 0)
13963         PlayLevelSoundElementAction(x, y, EL_SOKOBAN_FIELD_FULL,
13964                                     ACTION_EMPTYING);
13965       else
13966         PlayLevelSoundElementAction(nextx, nexty, EL_SOKOBAN_FIELD_EMPTY,
13967                                     ACTION_FILLING);
13968
13969       if (local_player->sokobanfields_still_needed == 0 &&
13970           (game.emulation == EMU_SOKOBAN || level.auto_exit_sokoban))
13971       {
13972         local_player->players_still_needed = 0;
13973
13974         PlayerWins(player);
13975
13976         PlayLevelSound(x, y, SND_GAME_SOKOBAN_SOLVING);
13977       }
13978     }
13979     else
13980       PlayLevelSoundElementAction(x, y, element, ACTION_PUSHING);
13981
13982     InitMovingField(x, y, move_direction);
13983     GfxAction[x][y] = ACTION_PUSHING;
13984
13985     if (mode == DF_SNAP)
13986       ContinueMoving(x, y);
13987     else
13988       MovPos[x][y] = (dx != 0 ? dx : dy);
13989
13990     Pushed[x][y] = TRUE;
13991     Pushed[nextx][nexty] = TRUE;
13992
13993     if (game.engine_version < VERSION_IDENT(2,2,0,7))
13994       player->push_delay_value = GET_NEW_PUSH_DELAY(element);
13995     else
13996       player->push_delay_value = -1;    /* get new value later */
13997
13998     /* check for element change _after_ element has been pushed */
13999     if (game.use_change_when_pushing_bug)
14000     {
14001       CheckElementChangeByPlayer(x, y, element, CE_PUSHED_BY_PLAYER,
14002                                  player->index_bit, dig_side);
14003       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_PUSHES_X,
14004                                           player->index_bit, dig_side);
14005     }
14006   }
14007   else if (IS_SWITCHABLE(element))
14008   {
14009     if (PLAYER_SWITCHING(player, x, y))
14010     {
14011       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_PRESSES_X,
14012                                           player->index_bit, dig_side);
14013
14014       return MP_ACTION;
14015     }
14016
14017     player->is_switching = TRUE;
14018     player->switch_x = x;
14019     player->switch_y = y;
14020
14021     PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVATING);
14022
14023     if (element == EL_ROBOT_WHEEL)
14024     {
14025       Feld[x][y] = EL_ROBOT_WHEEL_ACTIVE;
14026       ZX = x;
14027       ZY = y;
14028
14029       game.robot_wheel_active = TRUE;
14030
14031       TEST_DrawLevelField(x, y);
14032     }
14033     else if (element == EL_SP_TERMINAL)
14034     {
14035       int xx, yy;
14036
14037       SCAN_PLAYFIELD(xx, yy)
14038       {
14039         if (Feld[xx][yy] == EL_SP_DISK_YELLOW)
14040         {
14041           Bang(xx, yy);
14042         }
14043         else if (Feld[xx][yy] == EL_SP_TERMINAL)
14044         {
14045           Feld[xx][yy] = EL_SP_TERMINAL_ACTIVE;
14046
14047           ResetGfxAnimation(xx, yy);
14048           TEST_DrawLevelField(xx, yy);
14049         }
14050       }
14051     }
14052     else if (IS_BELT_SWITCH(element))
14053     {
14054       ToggleBeltSwitch(x, y);
14055     }
14056     else if (element == EL_SWITCHGATE_SWITCH_UP ||
14057              element == EL_SWITCHGATE_SWITCH_DOWN ||
14058              element == EL_DC_SWITCHGATE_SWITCH_UP ||
14059              element == EL_DC_SWITCHGATE_SWITCH_DOWN)
14060     {
14061       ToggleSwitchgateSwitch(x, y);
14062     }
14063     else if (element == EL_LIGHT_SWITCH ||
14064              element == EL_LIGHT_SWITCH_ACTIVE)
14065     {
14066       ToggleLightSwitch(x, y);
14067     }
14068     else if (element == EL_TIMEGATE_SWITCH ||
14069              element == EL_DC_TIMEGATE_SWITCH)
14070     {
14071       ActivateTimegateSwitch(x, y);
14072     }
14073     else if (element == EL_BALLOON_SWITCH_LEFT  ||
14074              element == EL_BALLOON_SWITCH_RIGHT ||
14075              element == EL_BALLOON_SWITCH_UP    ||
14076              element == EL_BALLOON_SWITCH_DOWN  ||
14077              element == EL_BALLOON_SWITCH_NONE  ||
14078              element == EL_BALLOON_SWITCH_ANY)
14079     {
14080       game.wind_direction = (element == EL_BALLOON_SWITCH_LEFT  ? MV_LEFT  :
14081                              element == EL_BALLOON_SWITCH_RIGHT ? MV_RIGHT :
14082                              element == EL_BALLOON_SWITCH_UP    ? MV_UP    :
14083                              element == EL_BALLOON_SWITCH_DOWN  ? MV_DOWN  :
14084                              element == EL_BALLOON_SWITCH_NONE  ? MV_NONE  :
14085                              move_direction);
14086     }
14087     else if (element == EL_LAMP)
14088     {
14089       Feld[x][y] = EL_LAMP_ACTIVE;
14090       local_player->lights_still_needed--;
14091
14092       ResetGfxAnimation(x, y);
14093       TEST_DrawLevelField(x, y);
14094     }
14095     else if (element == EL_TIME_ORB_FULL)
14096     {
14097       Feld[x][y] = EL_TIME_ORB_EMPTY;
14098
14099       if (level.time > 0 || level.use_time_orb_bug)
14100       {
14101         TimeLeft += level.time_orb_time;
14102         game.no_time_limit = FALSE;
14103
14104         game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
14105
14106         DisplayGameControlValues();
14107       }
14108
14109       ResetGfxAnimation(x, y);
14110       TEST_DrawLevelField(x, y);
14111     }
14112     else if (element == EL_EMC_MAGIC_BALL_SWITCH ||
14113              element == EL_EMC_MAGIC_BALL_SWITCH_ACTIVE)
14114     {
14115       int xx, yy;
14116
14117       game.ball_state = !game.ball_state;
14118
14119       SCAN_PLAYFIELD(xx, yy)
14120       {
14121         int e = Feld[xx][yy];
14122
14123         if (game.ball_state)
14124         {
14125           if (e == EL_EMC_MAGIC_BALL)
14126             CreateField(xx, yy, EL_EMC_MAGIC_BALL_ACTIVE);
14127           else if (e == EL_EMC_MAGIC_BALL_SWITCH)
14128             CreateField(xx, yy, EL_EMC_MAGIC_BALL_SWITCH_ACTIVE);
14129         }
14130         else
14131         {
14132           if (e == EL_EMC_MAGIC_BALL_ACTIVE)
14133             CreateField(xx, yy, EL_EMC_MAGIC_BALL);
14134           else if (e == EL_EMC_MAGIC_BALL_SWITCH_ACTIVE)
14135             CreateField(xx, yy, EL_EMC_MAGIC_BALL_SWITCH);
14136         }
14137       }
14138     }
14139
14140     CheckTriggeredElementChangeByPlayer(x, y, element, CE_SWITCH_OF_X,
14141                                         player->index_bit, dig_side);
14142
14143     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SWITCHES_X,
14144                                         player->index_bit, dig_side);
14145
14146     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_PRESSES_X,
14147                                         player->index_bit, dig_side);
14148
14149     return MP_ACTION;
14150   }
14151   else
14152   {
14153     if (!PLAYER_SWITCHING(player, x, y))
14154     {
14155       player->is_switching = TRUE;
14156       player->switch_x = x;
14157       player->switch_y = y;
14158
14159       CheckElementChangeByPlayer(x, y, element, CE_SWITCHED,
14160                                  player->index_bit, dig_side);
14161       CheckTriggeredElementChangeByPlayer(x, y, element, CE_SWITCH_OF_X,
14162                                           player->index_bit, dig_side);
14163
14164       CheckElementChangeByPlayer(x, y, element, CE_SWITCHED_BY_PLAYER,
14165                                  player->index_bit, dig_side);
14166       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SWITCHES_X,
14167                                           player->index_bit, dig_side);
14168     }
14169
14170     CheckElementChangeByPlayer(x, y, element, CE_PRESSED_BY_PLAYER,
14171                                player->index_bit, dig_side);
14172     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_PRESSES_X,
14173                                         player->index_bit, dig_side);
14174
14175     return MP_NO_ACTION;
14176   }
14177
14178   player->push_delay = -1;
14179
14180   if (is_player)                /* function can also be called by EL_PENGUIN */
14181   {
14182     if (Feld[x][y] != element)          /* really digged/collected something */
14183     {
14184       player->is_collecting = !player->is_digging;
14185       player->is_active = TRUE;
14186     }
14187   }
14188
14189   return MP_MOVING;
14190 }
14191
14192 static boolean DigFieldByCE(int x, int y, int digging_element)
14193 {
14194   int element = Feld[x][y];
14195
14196   if (!IS_FREE(x, y))
14197   {
14198     int action = (IS_DIGGABLE(element) ? ACTION_DIGGING :
14199                   IS_COLLECTIBLE(element) ? ACTION_COLLECTING :
14200                   ACTION_BREAKING);
14201
14202     /* no element can dig solid indestructible elements */
14203     if (IS_INDESTRUCTIBLE(element) &&
14204         !IS_DIGGABLE(element) &&
14205         !IS_COLLECTIBLE(element))
14206       return FALSE;
14207
14208     if (AmoebaNr[x][y] &&
14209         (element == EL_AMOEBA_FULL ||
14210          element == EL_BD_AMOEBA ||
14211          element == EL_AMOEBA_GROWING))
14212     {
14213       AmoebaCnt[AmoebaNr[x][y]]--;
14214       AmoebaCnt2[AmoebaNr[x][y]]--;
14215     }
14216
14217     if (IS_MOVING(x, y))
14218       RemoveMovingField(x, y);
14219     else
14220     {
14221       RemoveField(x, y);
14222       TEST_DrawLevelField(x, y);
14223     }
14224
14225     /* if digged element was about to explode, prevent the explosion */
14226     ExplodeField[x][y] = EX_TYPE_NONE;
14227
14228     PlayLevelSoundAction(x, y, action);
14229   }
14230
14231   Store[x][y] = EL_EMPTY;
14232
14233   /* this makes it possible to leave the removed element again */
14234   if (IS_EQUAL_OR_IN_GROUP(element, MOVE_ENTER_EL(digging_element)))
14235     Store[x][y] = element;
14236
14237   return TRUE;
14238 }
14239
14240 static boolean SnapField(struct PlayerInfo *player, int dx, int dy)
14241 {
14242   int jx = player->jx, jy = player->jy;
14243   int x = jx + dx, y = jy + dy;
14244   int snap_direction = (dx == -1 ? MV_LEFT  :
14245                         dx == +1 ? MV_RIGHT :
14246                         dy == -1 ? MV_UP    :
14247                         dy == +1 ? MV_DOWN  : MV_NONE);
14248   boolean can_continue_snapping = (level.continuous_snapping &&
14249                                    WasJustFalling[x][y] < CHECK_DELAY_FALLING);
14250
14251   if (player->MovPos != 0 && game.engine_version >= VERSION_IDENT(2,2,0,0))
14252     return FALSE;
14253
14254   if (!player->active || !IN_LEV_FIELD(x, y))
14255     return FALSE;
14256
14257   if (dx && dy)
14258     return FALSE;
14259
14260   if (!dx && !dy)
14261   {
14262     if (player->MovPos == 0)
14263       player->is_pushing = FALSE;
14264
14265     player->is_snapping = FALSE;
14266
14267     if (player->MovPos == 0)
14268     {
14269       player->is_moving = FALSE;
14270       player->is_digging = FALSE;
14271       player->is_collecting = FALSE;
14272     }
14273
14274     return FALSE;
14275   }
14276
14277   /* prevent snapping with already pressed snap key when not allowed */
14278   if (player->is_snapping && !can_continue_snapping)
14279     return FALSE;
14280
14281   player->MovDir = snap_direction;
14282
14283   if (player->MovPos == 0)
14284   {
14285     player->is_moving = FALSE;
14286     player->is_digging = FALSE;
14287     player->is_collecting = FALSE;
14288   }
14289
14290   player->is_dropping = FALSE;
14291   player->is_dropping_pressed = FALSE;
14292   player->drop_pressed_delay = 0;
14293
14294   if (DigField(player, jx, jy, x, y, 0, 0, DF_SNAP) == MP_NO_ACTION)
14295     return FALSE;
14296
14297   player->is_snapping = TRUE;
14298   player->is_active = TRUE;
14299
14300   if (player->MovPos == 0)
14301   {
14302     player->is_moving = FALSE;
14303     player->is_digging = FALSE;
14304     player->is_collecting = FALSE;
14305   }
14306
14307   if (player->MovPos != 0)      /* prevent graphic bugs in versions < 2.2.0 */
14308     TEST_DrawLevelField(player->last_jx, player->last_jy);
14309
14310   TEST_DrawLevelField(x, y);
14311
14312   return TRUE;
14313 }
14314
14315 static boolean DropElement(struct PlayerInfo *player)
14316 {
14317   int old_element, new_element;
14318   int dropx = player->jx, dropy = player->jy;
14319   int drop_direction = player->MovDir;
14320   int drop_side = drop_direction;
14321   int drop_element = get_next_dropped_element(player);
14322
14323   /* do not drop an element on top of another element; when holding drop key
14324      pressed without moving, dropped element must move away before the next
14325      element can be dropped (this is especially important if the next element
14326      is dynamite, which can be placed on background for historical reasons) */
14327   if (PLAYER_DROPPING(player, dropx, dropy) && Feld[dropx][dropy] != EL_EMPTY)
14328     return MP_ACTION;
14329
14330   if (IS_THROWABLE(drop_element))
14331   {
14332     dropx += GET_DX_FROM_DIR(drop_direction);
14333     dropy += GET_DY_FROM_DIR(drop_direction);
14334
14335     if (!IN_LEV_FIELD(dropx, dropy))
14336       return FALSE;
14337   }
14338
14339   old_element = Feld[dropx][dropy];     /* old element at dropping position */
14340   new_element = drop_element;           /* default: no change when dropping */
14341
14342   /* check if player is active, not moving and ready to drop */
14343   if (!player->active || player->MovPos || player->drop_delay > 0)
14344     return FALSE;
14345
14346   /* check if player has anything that can be dropped */
14347   if (new_element == EL_UNDEFINED)
14348     return FALSE;
14349
14350   /* only set if player has anything that can be dropped */
14351   player->is_dropping_pressed = TRUE;
14352
14353   /* check if drop key was pressed long enough for EM style dynamite */
14354   if (new_element == EL_EM_DYNAMITE && player->drop_pressed_delay < 40)
14355     return FALSE;
14356
14357   /* check if anything can be dropped at the current position */
14358   if (IS_ACTIVE_BOMB(old_element) || old_element == EL_EXPLOSION)
14359     return FALSE;
14360
14361   /* collected custom elements can only be dropped on empty fields */
14362   if (IS_CUSTOM_ELEMENT(new_element) && old_element != EL_EMPTY)
14363     return FALSE;
14364
14365   if (old_element != EL_EMPTY)
14366     Back[dropx][dropy] = old_element;   /* store old element on this field */
14367
14368   ResetGfxAnimation(dropx, dropy);
14369   ResetRandomAnimationValue(dropx, dropy);
14370
14371   if (player->inventory_size > 0 ||
14372       player->inventory_infinite_element != EL_UNDEFINED)
14373   {
14374     if (player->inventory_size > 0)
14375     {
14376       player->inventory_size--;
14377
14378       DrawGameDoorValues();
14379
14380       if (new_element == EL_DYNAMITE)
14381         new_element = EL_DYNAMITE_ACTIVE;
14382       else if (new_element == EL_EM_DYNAMITE)
14383         new_element = EL_EM_DYNAMITE_ACTIVE;
14384       else if (new_element == EL_SP_DISK_RED)
14385         new_element = EL_SP_DISK_RED_ACTIVE;
14386     }
14387
14388     Feld[dropx][dropy] = new_element;
14389
14390     if (IN_SCR_FIELD(SCREENX(dropx), SCREENY(dropy)))
14391       DrawGraphicThruMask(SCREENX(dropx), SCREENY(dropy),
14392                           el2img(Feld[dropx][dropy]), 0);
14393
14394     PlayLevelSoundAction(dropx, dropy, ACTION_DROPPING);
14395
14396     /* needed if previous element just changed to "empty" in the last frame */
14397     ChangeCount[dropx][dropy] = 0;      /* allow at least one more change */
14398
14399     CheckElementChangeByPlayer(dropx, dropy, new_element, CE_DROPPED_BY_PLAYER,
14400                                player->index_bit, drop_side);
14401     CheckTriggeredElementChangeByPlayer(dropx, dropy, new_element,
14402                                         CE_PLAYER_DROPS_X,
14403                                         player->index_bit, drop_side);
14404
14405     TestIfElementTouchesCustomElement(dropx, dropy);
14406   }
14407   else          /* player is dropping a dyna bomb */
14408   {
14409     player->dynabombs_left--;
14410
14411     Feld[dropx][dropy] = new_element;
14412
14413     if (IN_SCR_FIELD(SCREENX(dropx), SCREENY(dropy)))
14414       DrawGraphicThruMask(SCREENX(dropx), SCREENY(dropy),
14415                           el2img(Feld[dropx][dropy]), 0);
14416
14417     PlayLevelSoundAction(dropx, dropy, ACTION_DROPPING);
14418   }
14419
14420   if (Feld[dropx][dropy] == new_element) /* uninitialized unless CE change */
14421     InitField_WithBug1(dropx, dropy, FALSE);
14422
14423   new_element = Feld[dropx][dropy];     /* element might have changed */
14424
14425   if (IS_CUSTOM_ELEMENT(new_element) && CAN_MOVE(new_element) &&
14426       element_info[new_element].move_pattern == MV_WHEN_DROPPED)
14427   {
14428     if (element_info[new_element].move_direction_initial == MV_START_AUTOMATIC)
14429       MovDir[dropx][dropy] = drop_direction;
14430
14431     ChangeCount[dropx][dropy] = 0;      /* allow at least one more change */
14432
14433     /* do not cause impact style collision by dropping elements that can fall */
14434     CheckCollision[dropx][dropy] = CHECK_DELAY_COLLISION;
14435   }
14436
14437   player->drop_delay = GET_NEW_DROP_DELAY(drop_element);
14438   player->is_dropping = TRUE;
14439
14440   player->drop_pressed_delay = 0;
14441   player->is_dropping_pressed = FALSE;
14442
14443   player->drop_x = dropx;
14444   player->drop_y = dropy;
14445
14446   return TRUE;
14447 }
14448
14449 /* ------------------------------------------------------------------------- */
14450 /* game sound playing functions                                              */
14451 /* ------------------------------------------------------------------------- */
14452
14453 static int *loop_sound_frame = NULL;
14454 static int *loop_sound_volume = NULL;
14455
14456 void InitPlayLevelSound()
14457 {
14458   int num_sounds = getSoundListSize();
14459
14460   checked_free(loop_sound_frame);
14461   checked_free(loop_sound_volume);
14462
14463   loop_sound_frame  = checked_calloc(num_sounds * sizeof(int));
14464   loop_sound_volume = checked_calloc(num_sounds * sizeof(int));
14465 }
14466
14467 static void PlayLevelSound(int x, int y, int nr)
14468 {
14469   int sx = SCREENX(x), sy = SCREENY(y);
14470   int volume, stereo_position;
14471   int max_distance = 8;
14472   int type = (IS_LOOP_SOUND(nr) ? SND_CTRL_PLAY_LOOP : SND_CTRL_PLAY_SOUND);
14473
14474   if ((!setup.sound_simple && !IS_LOOP_SOUND(nr)) ||
14475       (!setup.sound_loops && IS_LOOP_SOUND(nr)))
14476     return;
14477
14478   if (!IN_LEV_FIELD(x, y) ||
14479       sx < -max_distance || sx >= SCR_FIELDX + max_distance ||
14480       sy < -max_distance || sy >= SCR_FIELDY + max_distance)
14481     return;
14482
14483   volume = SOUND_MAX_VOLUME;
14484
14485   if (!IN_SCR_FIELD(sx, sy))
14486   {
14487     int dx = ABS(sx - SCR_FIELDX / 2) - SCR_FIELDX / 2;
14488     int dy = ABS(sy - SCR_FIELDY / 2) - SCR_FIELDY / 2;
14489
14490     volume -= volume * (dx > dy ? dx : dy) / max_distance;
14491   }
14492
14493   stereo_position = (SOUND_MAX_LEFT +
14494                      (sx + max_distance) * SOUND_MAX_LEFT2RIGHT /
14495                      (SCR_FIELDX + 2 * max_distance));
14496
14497   if (IS_LOOP_SOUND(nr))
14498   {
14499     /* This assures that quieter loop sounds do not overwrite louder ones,
14500        while restarting sound volume comparison with each new game frame. */
14501
14502     if (loop_sound_volume[nr] > volume && loop_sound_frame[nr] == FrameCounter)
14503       return;
14504
14505     loop_sound_volume[nr] = volume;
14506     loop_sound_frame[nr] = FrameCounter;
14507   }
14508
14509   PlaySoundExt(nr, volume, stereo_position, type);
14510 }
14511
14512 static void PlayLevelSoundNearest(int x, int y, int sound_action)
14513 {
14514   PlayLevelSound(x < LEVELX(BX1) ? LEVELX(BX1) :
14515                  x > LEVELX(BX2) ? LEVELX(BX2) : x,
14516                  y < LEVELY(BY1) ? LEVELY(BY1) :
14517                  y > LEVELY(BY2) ? LEVELY(BY2) : y,
14518                  sound_action);
14519 }
14520
14521 static void PlayLevelSoundAction(int x, int y, int action)
14522 {
14523   PlayLevelSoundElementAction(x, y, Feld[x][y], action);
14524 }
14525
14526 static void PlayLevelSoundElementAction(int x, int y, int element, int action)
14527 {
14528   int sound_effect = element_info[SND_ELEMENT(element)].sound[action];
14529
14530   if (sound_effect != SND_UNDEFINED)
14531     PlayLevelSound(x, y, sound_effect);
14532 }
14533
14534 static void PlayLevelSoundElementActionIfLoop(int x, int y, int element,
14535                                               int action)
14536 {
14537   int sound_effect = element_info[SND_ELEMENT(element)].sound[action];
14538
14539   if (sound_effect != SND_UNDEFINED && IS_LOOP_SOUND(sound_effect))
14540     PlayLevelSound(x, y, sound_effect);
14541 }
14542
14543 static void PlayLevelSoundActionIfLoop(int x, int y, int action)
14544 {
14545   int sound_effect = element_info[SND_ELEMENT(Feld[x][y])].sound[action];
14546
14547   if (sound_effect != SND_UNDEFINED && IS_LOOP_SOUND(sound_effect))
14548     PlayLevelSound(x, y, sound_effect);
14549 }
14550
14551 static void StopLevelSoundActionIfLoop(int x, int y, int action)
14552 {
14553   int sound_effect = element_info[SND_ELEMENT(Feld[x][y])].sound[action];
14554
14555   if (sound_effect != SND_UNDEFINED && IS_LOOP_SOUND(sound_effect))
14556     StopSound(sound_effect);
14557 }
14558
14559 static int getLevelMusicNr()
14560 {
14561   if (levelset.music[level_nr] != MUS_UNDEFINED)
14562     return levelset.music[level_nr];            /* from config file */
14563   else
14564     return MAP_NOCONF_MUSIC(level_nr);          /* from music dir */
14565 }
14566
14567 static void FadeLevelSounds()
14568 {
14569   FadeSounds();
14570 }
14571
14572 static void FadeLevelMusic()
14573 {
14574   int music_nr = getLevelMusicNr();
14575   char *curr_music = getCurrentlyPlayingMusicFilename();
14576   char *next_music = getMusicInfoEntryFilename(music_nr);
14577
14578   if (!strEqual(curr_music, next_music))
14579     FadeMusic();
14580 }
14581
14582 void FadeLevelSoundsAndMusic()
14583 {
14584   FadeLevelSounds();
14585   FadeLevelMusic();
14586 }
14587
14588 static void PlayLevelMusic()
14589 {
14590   int music_nr = getLevelMusicNr();
14591   char *curr_music = getCurrentlyPlayingMusicFilename();
14592   char *next_music = getMusicInfoEntryFilename(music_nr);
14593
14594   if (!strEqual(curr_music, next_music))
14595     PlayMusic(music_nr);
14596 }
14597
14598 void PlayLevelSound_EM(int xx, int yy, int element_em, int sample)
14599 {
14600   int element = (element_em > -1 ? map_element_EM_to_RND(element_em) : 0);
14601   int offset = (BorderElement == EL_STEELWALL ? 1 : 0);
14602   int x = xx - 1 - offset;
14603   int y = yy - 1 - offset;
14604
14605   switch (sample)
14606   {
14607     case SAMPLE_blank:
14608       PlayLevelSoundElementAction(x, y, element, ACTION_WALKING);
14609       break;
14610
14611     case SAMPLE_roll:
14612       PlayLevelSoundElementAction(x, y, element, ACTION_PUSHING);
14613       break;
14614
14615     case SAMPLE_stone:
14616       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
14617       break;
14618
14619     case SAMPLE_nut:
14620       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
14621       break;
14622
14623     case SAMPLE_crack:
14624       PlayLevelSoundElementAction(x, y, element, ACTION_BREAKING);
14625       break;
14626
14627     case SAMPLE_bug:
14628       PlayLevelSoundElementAction(x, y, element, ACTION_MOVING);
14629       break;
14630
14631     case SAMPLE_tank:
14632       PlayLevelSoundElementAction(x, y, element, ACTION_MOVING);
14633       break;
14634
14635     case SAMPLE_android_clone:
14636       PlayLevelSoundElementAction(x, y, element, ACTION_DROPPING);
14637       break;
14638
14639     case SAMPLE_android_move:
14640       PlayLevelSoundElementAction(x, y, element, ACTION_MOVING);
14641       break;
14642
14643     case SAMPLE_spring:
14644       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
14645       break;
14646
14647     case SAMPLE_slurp:
14648       PlayLevelSoundElementAction(x, y, element, ACTION_EATING);
14649       break;
14650
14651     case SAMPLE_eater:
14652       PlayLevelSoundElementAction(x, y, element, ACTION_WAITING);
14653       break;
14654
14655     case SAMPLE_eater_eat:
14656       PlayLevelSoundElementAction(x, y, element, ACTION_DIGGING);
14657       break;
14658
14659     case SAMPLE_alien:
14660       PlayLevelSoundElementAction(x, y, element, ACTION_MOVING);
14661       break;
14662
14663     case SAMPLE_collect:
14664       PlayLevelSoundElementAction(x, y, element, ACTION_COLLECTING);
14665       break;
14666
14667     case SAMPLE_diamond:
14668       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
14669       break;
14670
14671     case SAMPLE_squash:
14672       /* !!! CHECK THIS !!! */
14673 #if 1
14674       PlayLevelSoundElementAction(x, y, element, ACTION_BREAKING);
14675 #else
14676       PlayLevelSoundElementAction(x, y, element, ACTION_SMASHED_BY_ROCK);
14677 #endif
14678       break;
14679
14680     case SAMPLE_wonderfall:
14681       PlayLevelSoundElementAction(x, y, element, ACTION_FILLING);
14682       break;
14683
14684     case SAMPLE_drip:
14685       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
14686       break;
14687
14688     case SAMPLE_push:
14689       PlayLevelSoundElementAction(x, y, element, ACTION_PUSHING);
14690       break;
14691
14692     case SAMPLE_dirt:
14693       PlayLevelSoundElementAction(x, y, element, ACTION_DIGGING);
14694       break;
14695
14696     case SAMPLE_acid:
14697       PlayLevelSoundElementAction(x, y, element, ACTION_SPLASHING);
14698       break;
14699
14700     case SAMPLE_ball:
14701       PlayLevelSoundElementAction(x, y, element, ACTION_DROPPING);
14702       break;
14703
14704     case SAMPLE_grow:
14705       PlayLevelSoundElementAction(x, y, element, ACTION_GROWING);
14706       break;
14707
14708     case SAMPLE_wonder:
14709       PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVE);
14710       break;
14711
14712     case SAMPLE_door:
14713       PlayLevelSoundElementAction(x, y, element, ACTION_PASSING);
14714       break;
14715
14716     case SAMPLE_exit_open:
14717       PlayLevelSoundElementAction(x, y, element, ACTION_OPENING);
14718       break;
14719
14720     case SAMPLE_exit_leave:
14721       PlayLevelSoundElementAction(x, y, element, ACTION_PASSING);
14722       break;
14723
14724     case SAMPLE_dynamite:
14725       PlayLevelSoundElementAction(x, y, element, ACTION_DROPPING);
14726       break;
14727
14728     case SAMPLE_tick:
14729       PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVE);
14730       break;
14731
14732     case SAMPLE_press:
14733       PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVATING);
14734       break;
14735
14736     case SAMPLE_wheel:
14737       PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVE);
14738       break;
14739
14740     case SAMPLE_boom:
14741       PlayLevelSoundElementAction(x, y, element, ACTION_EXPLODING);
14742       break;
14743
14744     case SAMPLE_die:
14745       PlayLevelSoundElementAction(x, y, element, ACTION_DYING);
14746       break;
14747
14748     case SAMPLE_time:
14749       PlaySound(SND_GAME_RUNNING_OUT_OF_TIME);
14750       break;
14751
14752     default:
14753       PlayLevelSoundElementAction(x, y, element, ACTION_DEFAULT);
14754       break;
14755   }
14756 }
14757
14758 void PlayLevelSound_SP(int xx, int yy, int element_sp, int action_sp)
14759 {
14760   int element = map_element_SP_to_RND(element_sp);
14761   int action = map_action_SP_to_RND(action_sp);
14762   int offset = (setup.sp_show_border_elements ? 0 : 1);
14763   int x = xx - offset;
14764   int y = yy - offset;
14765
14766   PlayLevelSoundElementAction(x, y, element, action);
14767 }
14768
14769 void PlayLevelSound_MM(int xx, int yy, int element_mm, int action_mm)
14770 {
14771   int element = map_element_MM_to_RND(element_mm);
14772   int action = map_action_MM_to_RND(action_mm);
14773   int offset = 0;
14774   int x = xx - offset;
14775   int y = yy - offset;
14776
14777   if (!IS_MM_ELEMENT(element))
14778     element = EL_MM_DEFAULT;
14779
14780   PlayLevelSoundElementAction(x, y, element, action);
14781 }
14782
14783 void PlaySound_MM(int sound_mm)
14784 {
14785   int sound = map_sound_MM_to_RND(sound_mm);
14786
14787   if (sound == SND_UNDEFINED)
14788     return;
14789
14790   PlaySound(sound);
14791 }
14792
14793 void PlaySoundLoop_MM(int sound_mm)
14794 {
14795   int sound = map_sound_MM_to_RND(sound_mm);
14796
14797   if (sound == SND_UNDEFINED)
14798     return;
14799
14800   PlaySoundLoop(sound);
14801 }
14802
14803 void StopSound_MM(int sound_mm)
14804 {
14805   int sound = map_sound_MM_to_RND(sound_mm);
14806
14807   if (sound == SND_UNDEFINED)
14808     return;
14809
14810   StopSound(sound);
14811 }
14812
14813 void RaiseScore(int value)
14814 {
14815   local_player->score += value;
14816
14817   game_panel_controls[GAME_PANEL_SCORE].value = local_player->score;
14818
14819   DisplayGameControlValues();
14820 }
14821
14822 void RaiseScoreElement(int element)
14823 {
14824   switch (element)
14825   {
14826     case EL_EMERALD:
14827     case EL_BD_DIAMOND:
14828     case EL_EMERALD_YELLOW:
14829     case EL_EMERALD_RED:
14830     case EL_EMERALD_PURPLE:
14831     case EL_SP_INFOTRON:
14832       RaiseScore(level.score[SC_EMERALD]);
14833       break;
14834     case EL_DIAMOND:
14835       RaiseScore(level.score[SC_DIAMOND]);
14836       break;
14837     case EL_CRYSTAL:
14838       RaiseScore(level.score[SC_CRYSTAL]);
14839       break;
14840     case EL_PEARL:
14841       RaiseScore(level.score[SC_PEARL]);
14842       break;
14843     case EL_BUG:
14844     case EL_BD_BUTTERFLY:
14845     case EL_SP_ELECTRON:
14846       RaiseScore(level.score[SC_BUG]);
14847       break;
14848     case EL_SPACESHIP:
14849     case EL_BD_FIREFLY:
14850     case EL_SP_SNIKSNAK:
14851       RaiseScore(level.score[SC_SPACESHIP]);
14852       break;
14853     case EL_YAMYAM:
14854     case EL_DARK_YAMYAM:
14855       RaiseScore(level.score[SC_YAMYAM]);
14856       break;
14857     case EL_ROBOT:
14858       RaiseScore(level.score[SC_ROBOT]);
14859       break;
14860     case EL_PACMAN:
14861       RaiseScore(level.score[SC_PACMAN]);
14862       break;
14863     case EL_NUT:
14864       RaiseScore(level.score[SC_NUT]);
14865       break;
14866     case EL_DYNAMITE:
14867     case EL_EM_DYNAMITE:
14868     case EL_SP_DISK_RED:
14869     case EL_DYNABOMB_INCREASE_NUMBER:
14870     case EL_DYNABOMB_INCREASE_SIZE:
14871     case EL_DYNABOMB_INCREASE_POWER:
14872       RaiseScore(level.score[SC_DYNAMITE]);
14873       break;
14874     case EL_SHIELD_NORMAL:
14875     case EL_SHIELD_DEADLY:
14876       RaiseScore(level.score[SC_SHIELD]);
14877       break;
14878     case EL_EXTRA_TIME:
14879       RaiseScore(level.extra_time_score);
14880       break;
14881     case EL_KEY_1:
14882     case EL_KEY_2:
14883     case EL_KEY_3:
14884     case EL_KEY_4:
14885     case EL_EM_KEY_1:
14886     case EL_EM_KEY_2:
14887     case EL_EM_KEY_3:
14888     case EL_EM_KEY_4:
14889     case EL_EMC_KEY_5:
14890     case EL_EMC_KEY_6:
14891     case EL_EMC_KEY_7:
14892     case EL_EMC_KEY_8:
14893     case EL_DC_KEY_WHITE:
14894       RaiseScore(level.score[SC_KEY]);
14895       break;
14896     default:
14897       RaiseScore(element_info[element].collect_score);
14898       break;
14899   }
14900 }
14901
14902 void RequestQuitGameExt(boolean skip_request, boolean quick_quit, char *message)
14903 {
14904   if (skip_request || Request(message, REQ_ASK | REQ_STAY_CLOSED))
14905   {
14906     /* closing door required in case of envelope style request dialogs */
14907     if (!skip_request)
14908       CloseDoor(DOOR_CLOSE_1);
14909
14910     if (network.enabled)
14911       SendToServer_StopPlaying(NETWORK_STOP_BY_PLAYER);
14912     else
14913     {
14914       if (quick_quit)
14915         FadeSkipNextFadeIn();
14916
14917       SetGameStatus(GAME_MODE_MAIN);
14918
14919       DrawMainMenu();
14920     }
14921   }
14922   else          /* continue playing the game */
14923   {
14924     if (tape.playing && tape.deactivate_display)
14925       TapeDeactivateDisplayOff(TRUE);
14926
14927     OpenDoor(DOOR_OPEN_1 | DOOR_COPY_BACK);
14928
14929     if (tape.playing && tape.deactivate_display)
14930       TapeDeactivateDisplayOn();
14931   }
14932 }
14933
14934 void RequestQuitGame(boolean ask_if_really_quit)
14935 {
14936   boolean quick_quit = (!ask_if_really_quit || level_editor_test_game);
14937   boolean skip_request = AllPlayersGone || quick_quit;
14938
14939   RequestQuitGameExt(skip_request, quick_quit,
14940                      "Do you really want to quit the game?");
14941 }
14942
14943 void RequestRestartGame(char *message)
14944 {
14945   game.restart_game_message = NULL;
14946
14947   if (Request(message, REQ_ASK | REQ_STAY_CLOSED))
14948   {
14949     StartGameActions(network.enabled, setup.autorecord, level.random_seed);
14950   }
14951   else
14952   {
14953     SetGameStatus(GAME_MODE_MAIN);
14954
14955     DrawMainMenu();
14956   }
14957 }
14958
14959
14960 /* ------------------------------------------------------------------------- */
14961 /* random generator functions                                                */
14962 /* ------------------------------------------------------------------------- */
14963
14964 unsigned int InitEngineRandom_RND(int seed)
14965 {
14966   game.num_random_calls = 0;
14967
14968   return InitEngineRandom(seed);
14969 }
14970
14971 unsigned int RND(int max)
14972 {
14973   if (max > 0)
14974   {
14975     game.num_random_calls++;
14976
14977     return GetEngineRandom(max);
14978   }
14979
14980   return 0;
14981 }
14982
14983
14984 /* ------------------------------------------------------------------------- */
14985 /* game engine snapshot handling functions                                   */
14986 /* ------------------------------------------------------------------------- */
14987
14988 struct EngineSnapshotInfo
14989 {
14990   /* runtime values for custom element collect score */
14991   int collect_score[NUM_CUSTOM_ELEMENTS];
14992
14993   /* runtime values for group element choice position */
14994   int choice_pos[NUM_GROUP_ELEMENTS];
14995
14996   /* runtime values for belt position animations */
14997   int belt_graphic[4][NUM_BELT_PARTS];
14998   int belt_anim_mode[4][NUM_BELT_PARTS];
14999 };
15000
15001 static struct EngineSnapshotInfo engine_snapshot_rnd;
15002 static char *snapshot_level_identifier = NULL;
15003 static int snapshot_level_nr = -1;
15004
15005 static void SaveEngineSnapshotValues_RND()
15006 {
15007   static int belt_base_active_element[4] =
15008   {
15009     EL_CONVEYOR_BELT_1_LEFT_ACTIVE,
15010     EL_CONVEYOR_BELT_2_LEFT_ACTIVE,
15011     EL_CONVEYOR_BELT_3_LEFT_ACTIVE,
15012     EL_CONVEYOR_BELT_4_LEFT_ACTIVE
15013   };
15014   int i, j;
15015
15016   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
15017   {
15018     int element = EL_CUSTOM_START + i;
15019
15020     engine_snapshot_rnd.collect_score[i] = element_info[element].collect_score;
15021   }
15022
15023   for (i = 0; i < NUM_GROUP_ELEMENTS; i++)
15024   {
15025     int element = EL_GROUP_START + i;
15026
15027     engine_snapshot_rnd.choice_pos[i] = element_info[element].group->choice_pos;
15028   }
15029
15030   for (i = 0; i < 4; i++)
15031   {
15032     for (j = 0; j < NUM_BELT_PARTS; j++)
15033     {
15034       int element = belt_base_active_element[i] + j;
15035       int graphic = el2img(element);
15036       int anim_mode = graphic_info[graphic].anim_mode;
15037
15038       engine_snapshot_rnd.belt_graphic[i][j] = graphic;
15039       engine_snapshot_rnd.belt_anim_mode[i][j] = anim_mode;
15040     }
15041   }
15042 }
15043
15044 static void LoadEngineSnapshotValues_RND()
15045 {
15046   unsigned int num_random_calls = game.num_random_calls;
15047   int i, j;
15048
15049   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
15050   {
15051     int element = EL_CUSTOM_START + i;
15052
15053     element_info[element].collect_score = engine_snapshot_rnd.collect_score[i];
15054   }
15055
15056   for (i = 0; i < NUM_GROUP_ELEMENTS; i++)
15057   {
15058     int element = EL_GROUP_START + i;
15059
15060     element_info[element].group->choice_pos = engine_snapshot_rnd.choice_pos[i];
15061   }
15062
15063   for (i = 0; i < 4; i++)
15064   {
15065     for (j = 0; j < NUM_BELT_PARTS; j++)
15066     {
15067       int graphic = engine_snapshot_rnd.belt_graphic[i][j];
15068       int anim_mode = engine_snapshot_rnd.belt_anim_mode[i][j];
15069
15070       graphic_info[graphic].anim_mode = anim_mode;
15071     }
15072   }
15073
15074   if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
15075   {
15076     InitRND(tape.random_seed);
15077     for (i = 0; i < num_random_calls; i++)
15078       RND(1);
15079   }
15080
15081   if (game.num_random_calls != num_random_calls)
15082   {
15083     Error(ERR_INFO, "number of random calls out of sync");
15084     Error(ERR_INFO, "number of random calls should be %d", num_random_calls);
15085     Error(ERR_INFO, "number of random calls is %d", game.num_random_calls);
15086     Error(ERR_EXIT, "this should not happen -- please debug");
15087   }
15088 }
15089
15090 void FreeEngineSnapshotSingle()
15091 {
15092   FreeSnapshotSingle();
15093
15094   setString(&snapshot_level_identifier, NULL);
15095   snapshot_level_nr = -1;
15096 }
15097
15098 void FreeEngineSnapshotList()
15099 {
15100   FreeSnapshotList();
15101 }
15102
15103 ListNode *SaveEngineSnapshotBuffers()
15104 {
15105   ListNode *buffers = NULL;
15106
15107   /* copy some special values to a structure better suited for the snapshot */
15108
15109   if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
15110     SaveEngineSnapshotValues_RND();
15111   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
15112     SaveEngineSnapshotValues_EM();
15113   if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
15114     SaveEngineSnapshotValues_SP(&buffers);
15115   if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
15116     SaveEngineSnapshotValues_MM(&buffers);
15117
15118   /* save values stored in special snapshot structure */
15119
15120   if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
15121     SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(engine_snapshot_rnd));
15122   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
15123     SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(engine_snapshot_em));
15124   if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
15125     SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(engine_snapshot_sp));
15126   if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
15127     SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(engine_snapshot_mm));
15128
15129   /* save further RND engine values */
15130
15131   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(stored_player));
15132   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(game));
15133   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(tape));
15134
15135   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ZX));
15136   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ZY));
15137   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ExitX));
15138   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ExitY));
15139
15140   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(FrameCounter));
15141   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(TimeFrames));
15142   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(TimePlayed));
15143   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(TimeLeft));
15144   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(TapeTime));
15145
15146   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ScreenMovDir));
15147   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ScreenMovPos));
15148   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ScreenGfxPos));
15149
15150   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ScrollStepSize));
15151
15152   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(AllPlayersGone));
15153
15154   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(AmoebaCnt));
15155   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(AmoebaCnt2));
15156
15157   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Feld));
15158   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(MovPos));
15159   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(MovDir));
15160   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(MovDelay));
15161   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ChangeDelay));
15162   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ChangePage));
15163   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(CustomValue));
15164   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Store));
15165   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Store2));
15166   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(StorePlayer));
15167   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Back));
15168   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(AmoebaNr));
15169   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(WasJustMoving));
15170   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(WasJustFalling));
15171   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(CheckCollision));
15172   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(CheckImpact));
15173   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Stop));
15174   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Pushed));
15175
15176   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ChangeCount));
15177   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ChangeEvent));
15178
15179   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ExplodePhase));
15180   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ExplodeDelay));
15181   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ExplodeField));
15182
15183   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(RunnerVisit));
15184   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(PlayerVisit));
15185
15186   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxFrame));
15187   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxRandom));
15188   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxElement));
15189   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxAction));
15190   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxDir));
15191
15192   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(scroll_x));
15193   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(scroll_y));
15194
15195 #if 0
15196   ListNode *node = engine_snapshot_list_rnd;
15197   int num_bytes = 0;
15198
15199   while (node != NULL)
15200   {
15201     num_bytes += ((struct EngineSnapshotNodeInfo *)node->content)->size;
15202
15203     node = node->next;
15204   }
15205
15206   printf("::: size of engine snapshot: %d bytes\n", num_bytes);
15207 #endif
15208
15209   return buffers;
15210 }
15211
15212 void SaveEngineSnapshotSingle()
15213 {
15214   ListNode *buffers = SaveEngineSnapshotBuffers();
15215
15216   /* finally save all snapshot buffers to single snapshot */
15217   SaveSnapshotSingle(buffers);
15218
15219   /* save level identification information */
15220   setString(&snapshot_level_identifier, leveldir_current->identifier);
15221   snapshot_level_nr = level_nr;
15222 }
15223
15224 boolean CheckSaveEngineSnapshotToList()
15225 {
15226   boolean save_snapshot =
15227     ((game.snapshot.mode == SNAPSHOT_MODE_EVERY_STEP) ||
15228      (game.snapshot.mode == SNAPSHOT_MODE_EVERY_MOVE &&
15229       game.snapshot.changed_action) ||
15230      (game.snapshot.mode == SNAPSHOT_MODE_EVERY_COLLECT &&
15231       game.snapshot.collected_item));
15232
15233   game.snapshot.changed_action = FALSE;
15234   game.snapshot.collected_item = FALSE;
15235   game.snapshot.save_snapshot = save_snapshot;
15236
15237   return save_snapshot;
15238 }
15239
15240 void SaveEngineSnapshotToList()
15241 {
15242   if (game.snapshot.mode == SNAPSHOT_MODE_OFF ||
15243       tape.quick_resume)
15244     return;
15245
15246   ListNode *buffers = SaveEngineSnapshotBuffers();
15247
15248   /* finally save all snapshot buffers to snapshot list */
15249   SaveSnapshotToList(buffers);
15250 }
15251
15252 void SaveEngineSnapshotToListInitial()
15253 {
15254   FreeEngineSnapshotList();
15255
15256   SaveEngineSnapshotToList();
15257 }
15258
15259 void LoadEngineSnapshotValues()
15260 {
15261   /* restore special values from snapshot structure */
15262
15263   if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
15264     LoadEngineSnapshotValues_RND();
15265   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
15266     LoadEngineSnapshotValues_EM();
15267   if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
15268     LoadEngineSnapshotValues_SP();
15269   if (level.game_engine_type == GAME_ENGINE_TYPE_MM)
15270     LoadEngineSnapshotValues_MM();
15271 }
15272
15273 void LoadEngineSnapshotSingle()
15274 {
15275   LoadSnapshotSingle();
15276
15277   LoadEngineSnapshotValues();
15278 }
15279
15280 void LoadEngineSnapshot_Undo(int steps)
15281 {
15282   LoadSnapshotFromList_Older(steps);
15283
15284   LoadEngineSnapshotValues();
15285 }
15286
15287 void LoadEngineSnapshot_Redo(int steps)
15288 {
15289   LoadSnapshotFromList_Newer(steps);
15290
15291   LoadEngineSnapshotValues();
15292 }
15293
15294 boolean CheckEngineSnapshotSingle()
15295 {
15296   return (strEqual(snapshot_level_identifier, leveldir_current->identifier) &&
15297           snapshot_level_nr == level_nr);
15298 }
15299
15300 boolean CheckEngineSnapshotList()
15301 {
15302   return CheckSnapshotList();
15303 }
15304
15305
15306 /* ---------- new game button stuff ---------------------------------------- */
15307
15308 static struct
15309 {
15310   int graphic;
15311   struct XY *pos;
15312   int gadget_id;
15313   boolean *setup_value;
15314   boolean allowed_on_tape;
15315   char *infotext;
15316 } gamebutton_info[NUM_GAME_BUTTONS] =
15317 {
15318   {
15319     IMG_GFX_GAME_BUTTON_STOP,                   &game.button.stop,
15320     GAME_CTRL_ID_STOP,                          NULL,
15321     TRUE,                                       "stop game"
15322   },
15323   {
15324     IMG_GFX_GAME_BUTTON_PAUSE,                  &game.button.pause,
15325     GAME_CTRL_ID_PAUSE,                         NULL,
15326     TRUE,                                       "pause game"
15327   },
15328   {
15329     IMG_GFX_GAME_BUTTON_PLAY,                   &game.button.play,
15330     GAME_CTRL_ID_PLAY,                          NULL,
15331     TRUE,                                       "play game"
15332   },
15333   {
15334     IMG_GFX_GAME_BUTTON_UNDO,                   &game.button.undo,
15335     GAME_CTRL_ID_UNDO,                          NULL,
15336     TRUE,                                       "undo step"
15337   },
15338   {
15339     IMG_GFX_GAME_BUTTON_REDO,                   &game.button.redo,
15340     GAME_CTRL_ID_REDO,                          NULL,
15341     TRUE,                                       "redo step"
15342   },
15343   {
15344     IMG_GFX_GAME_BUTTON_SAVE,                   &game.button.save,
15345     GAME_CTRL_ID_SAVE,                          NULL,
15346     TRUE,                                       "save game"
15347   },
15348   {
15349     IMG_GFX_GAME_BUTTON_PAUSE2,                 &game.button.pause2,
15350     GAME_CTRL_ID_PAUSE2,                        NULL,
15351     TRUE,                                       "pause game"
15352   },
15353   {
15354     IMG_GFX_GAME_BUTTON_LOAD,                   &game.button.load,
15355     GAME_CTRL_ID_LOAD,                          NULL,
15356     TRUE,                                       "load game"
15357   },
15358   {
15359     IMG_GFX_GAME_BUTTON_PANEL_STOP,             &game.button.panel_stop,
15360     GAME_CTRL_ID_PANEL_STOP,                    NULL,
15361     FALSE,                                      "stop game"
15362   },
15363   {
15364     IMG_GFX_GAME_BUTTON_PANEL_PAUSE,            &game.button.panel_pause,
15365     GAME_CTRL_ID_PANEL_PAUSE,                   NULL,
15366     FALSE,                                      "pause game"
15367   },
15368   {
15369     IMG_GFX_GAME_BUTTON_PANEL_PLAY,             &game.button.panel_play,
15370     GAME_CTRL_ID_PANEL_PLAY,                    NULL,
15371     FALSE,                                      "play game"
15372   },
15373   {
15374     IMG_GFX_GAME_BUTTON_SOUND_MUSIC,            &game.button.sound_music,
15375     SOUND_CTRL_ID_MUSIC,                        &setup.sound_music,
15376     TRUE,                                       "background music on/off"
15377   },
15378   {
15379     IMG_GFX_GAME_BUTTON_SOUND_LOOPS,            &game.button.sound_loops,
15380     SOUND_CTRL_ID_LOOPS,                        &setup.sound_loops,
15381     TRUE,                                       "sound loops on/off"
15382   },
15383   {
15384     IMG_GFX_GAME_BUTTON_SOUND_SIMPLE,           &game.button.sound_simple,
15385     SOUND_CTRL_ID_SIMPLE,                       &setup.sound_simple,
15386     TRUE,                                       "normal sounds on/off"
15387   },
15388   {
15389     IMG_GFX_GAME_BUTTON_PANEL_SOUND_MUSIC,      &game.button.panel_sound_music,
15390     SOUND_CTRL_ID_PANEL_MUSIC,                  &setup.sound_music,
15391     FALSE,                                      "background music on/off"
15392   },
15393   {
15394     IMG_GFX_GAME_BUTTON_PANEL_SOUND_LOOPS,      &game.button.panel_sound_loops,
15395     SOUND_CTRL_ID_PANEL_LOOPS,                  &setup.sound_loops,
15396     FALSE,                                      "sound loops on/off"
15397   },
15398   {
15399     IMG_GFX_GAME_BUTTON_PANEL_SOUND_SIMPLE,     &game.button.panel_sound_simple,
15400     SOUND_CTRL_ID_PANEL_SIMPLE,                 &setup.sound_simple,
15401     FALSE,                                      "normal sounds on/off"
15402   }
15403 };
15404
15405 void CreateGameButtons()
15406 {
15407   int i;
15408
15409   for (i = 0; i < NUM_GAME_BUTTONS; i++)
15410   {
15411     int graphic = gamebutton_info[i].graphic;
15412     struct GraphicInfo *gfx = &graphic_info[graphic];
15413     struct XY *pos = gamebutton_info[i].pos;
15414     struct GadgetInfo *gi;
15415     int button_type;
15416     boolean checked;
15417     unsigned int event_mask;
15418     boolean allowed_on_tape = gamebutton_info[i].allowed_on_tape;
15419     boolean on_tape = (tape.show_game_buttons && allowed_on_tape);
15420     int base_x = (on_tape ? VX : DX);
15421     int base_y = (on_tape ? VY : DY);
15422     int gd_x   = gfx->src_x;
15423     int gd_y   = gfx->src_y;
15424     int gd_xp  = gfx->src_x + gfx->pressed_xoffset;
15425     int gd_yp  = gfx->src_y + gfx->pressed_yoffset;
15426     int gd_xa  = gfx->src_x + gfx->active_xoffset;
15427     int gd_ya  = gfx->src_y + gfx->active_yoffset;
15428     int gd_xap = gfx->src_x + gfx->active_xoffset + gfx->pressed_xoffset;
15429     int gd_yap = gfx->src_y + gfx->active_yoffset + gfx->pressed_yoffset;
15430     int id = i;
15431
15432     if (gfx->bitmap == NULL)
15433     {
15434       game_gadget[id] = NULL;
15435
15436       continue;
15437     }
15438
15439     if (id == GAME_CTRL_ID_STOP ||
15440         id == GAME_CTRL_ID_PANEL_STOP ||
15441         id == GAME_CTRL_ID_PLAY ||
15442         id == GAME_CTRL_ID_PANEL_PLAY ||
15443         id == GAME_CTRL_ID_SAVE ||
15444         id == GAME_CTRL_ID_LOAD)
15445     {
15446       button_type = GD_TYPE_NORMAL_BUTTON;
15447       checked = FALSE;
15448       event_mask = GD_EVENT_RELEASED;
15449     }
15450     else if (id == GAME_CTRL_ID_UNDO ||
15451              id == GAME_CTRL_ID_REDO)
15452     {
15453       button_type = GD_TYPE_NORMAL_BUTTON;
15454       checked = FALSE;
15455       event_mask = GD_EVENT_PRESSED | GD_EVENT_REPEATED;
15456     }
15457     else
15458     {
15459       button_type = GD_TYPE_CHECK_BUTTON;
15460       checked = (gamebutton_info[i].setup_value != NULL ?
15461                  *gamebutton_info[i].setup_value : FALSE);
15462       event_mask = GD_EVENT_PRESSED;
15463     }
15464
15465     gi = CreateGadget(GDI_CUSTOM_ID, id,
15466                       GDI_IMAGE_ID, graphic,
15467                       GDI_INFO_TEXT, gamebutton_info[i].infotext,
15468                       GDI_X, base_x + GDI_ACTIVE_POS(pos->x),
15469                       GDI_Y, base_y + GDI_ACTIVE_POS(pos->y),
15470                       GDI_WIDTH, gfx->width,
15471                       GDI_HEIGHT, gfx->height,
15472                       GDI_TYPE, button_type,
15473                       GDI_STATE, GD_BUTTON_UNPRESSED,
15474                       GDI_CHECKED, checked,
15475                       GDI_DESIGN_UNPRESSED, gfx->bitmap, gd_x, gd_y,
15476                       GDI_DESIGN_PRESSED, gfx->bitmap, gd_xp, gd_yp,
15477                       GDI_ALT_DESIGN_UNPRESSED, gfx->bitmap, gd_xa, gd_ya,
15478                       GDI_ALT_DESIGN_PRESSED, gfx->bitmap, gd_xap, gd_yap,
15479                       GDI_DIRECT_DRAW, FALSE,
15480                       GDI_EVENT_MASK, event_mask,
15481                       GDI_CALLBACK_ACTION, HandleGameButtons,
15482                       GDI_END);
15483
15484     if (gi == NULL)
15485       Error(ERR_EXIT, "cannot create gadget");
15486
15487     game_gadget[id] = gi;
15488   }
15489 }
15490
15491 void FreeGameButtons()
15492 {
15493   int i;
15494
15495   for (i = 0; i < NUM_GAME_BUTTONS; i++)
15496     FreeGadget(game_gadget[i]);
15497 }
15498
15499 static void UnmapGameButtonsAtSamePosition(int id)
15500 {
15501   int i;
15502
15503   for (i = 0; i < NUM_GAME_BUTTONS; i++)
15504     if (i != id &&
15505         gamebutton_info[i].pos->x == gamebutton_info[id].pos->x &&
15506         gamebutton_info[i].pos->y == gamebutton_info[id].pos->y)
15507       UnmapGadget(game_gadget[i]);
15508 }
15509
15510 static void UnmapGameButtonsAtSamePosition_All()
15511 {
15512   if (setup.show_snapshot_buttons)
15513   {
15514     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_SAVE);
15515     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PAUSE2);
15516     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_LOAD);
15517   }
15518   else
15519   {
15520     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_STOP);
15521     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PAUSE);
15522     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PLAY);
15523
15524     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PANEL_STOP);
15525     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PANEL_PAUSE);
15526     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PANEL_PLAY);
15527   }
15528 }
15529
15530 static void MapGameButtonsAtSamePosition(int id)
15531 {
15532   int i;
15533
15534   for (i = 0; i < NUM_GAME_BUTTONS; i++)
15535     if (i != id &&
15536         gamebutton_info[i].pos->x == gamebutton_info[id].pos->x &&
15537         gamebutton_info[i].pos->y == gamebutton_info[id].pos->y)
15538       MapGadget(game_gadget[i]);
15539
15540   UnmapGameButtonsAtSamePosition_All();
15541 }
15542
15543 void MapUndoRedoButtons()
15544 {
15545   UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_UNDO);
15546   UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_REDO);
15547
15548   MapGadget(game_gadget[GAME_CTRL_ID_UNDO]);
15549   MapGadget(game_gadget[GAME_CTRL_ID_REDO]);
15550
15551   ModifyGadget(game_gadget[GAME_CTRL_ID_PAUSE2], GDI_CHECKED, TRUE, GDI_END);
15552 }
15553
15554 void UnmapUndoRedoButtons()
15555 {
15556   UnmapGadget(game_gadget[GAME_CTRL_ID_UNDO]);
15557   UnmapGadget(game_gadget[GAME_CTRL_ID_REDO]);
15558
15559   MapGameButtonsAtSamePosition(GAME_CTRL_ID_UNDO);
15560   MapGameButtonsAtSamePosition(GAME_CTRL_ID_REDO);
15561
15562   ModifyGadget(game_gadget[GAME_CTRL_ID_PAUSE2], GDI_CHECKED, FALSE, GDI_END);
15563 }
15564
15565 void MapGameButtonsExt(boolean on_tape)
15566 {
15567   int i;
15568
15569   for (i = 0; i < NUM_GAME_BUTTONS; i++)
15570     if ((!on_tape || gamebutton_info[i].allowed_on_tape) &&
15571         i != GAME_CTRL_ID_UNDO &&
15572         i != GAME_CTRL_ID_REDO)
15573       MapGadget(game_gadget[i]);
15574
15575   UnmapGameButtonsAtSamePosition_All();
15576
15577   RedrawGameButtons();
15578 }
15579
15580 void UnmapGameButtonsExt(boolean on_tape)
15581 {
15582   int i;
15583
15584   for (i = 0; i < NUM_GAME_BUTTONS; i++)
15585     if (!on_tape || gamebutton_info[i].allowed_on_tape)
15586       UnmapGadget(game_gadget[i]);
15587 }
15588
15589 void RedrawGameButtonsExt(boolean on_tape)
15590 {
15591   int i;
15592
15593   for (i = 0; i < NUM_GAME_BUTTONS; i++)
15594     if (!on_tape || gamebutton_info[i].allowed_on_tape)
15595       RedrawGadget(game_gadget[i]);
15596
15597   // RedrawGadget() may have set REDRAW_ALL if buttons are defined off-area
15598   redraw_mask &= ~REDRAW_ALL;
15599 }
15600
15601 void SetGadgetState(struct GadgetInfo *gi, boolean state)
15602 {
15603   if (gi == NULL)
15604     return;
15605
15606   gi->checked = state;
15607 }
15608
15609 void RedrawSoundButtonGadget(int id)
15610 {
15611   int id2 = (id == SOUND_CTRL_ID_MUSIC        ? SOUND_CTRL_ID_PANEL_MUSIC :
15612              id == SOUND_CTRL_ID_LOOPS        ? SOUND_CTRL_ID_PANEL_LOOPS :
15613              id == SOUND_CTRL_ID_SIMPLE       ? SOUND_CTRL_ID_PANEL_SIMPLE :
15614              id == SOUND_CTRL_ID_PANEL_MUSIC  ? SOUND_CTRL_ID_MUSIC :
15615              id == SOUND_CTRL_ID_PANEL_LOOPS  ? SOUND_CTRL_ID_LOOPS :
15616              id == SOUND_CTRL_ID_PANEL_SIMPLE ? SOUND_CTRL_ID_SIMPLE :
15617              id);
15618
15619   SetGadgetState(game_gadget[id2], *gamebutton_info[id2].setup_value);
15620   RedrawGadget(game_gadget[id2]);
15621 }
15622
15623 void MapGameButtons()
15624 {
15625   MapGameButtonsExt(FALSE);
15626 }
15627
15628 void UnmapGameButtons()
15629 {
15630   UnmapGameButtonsExt(FALSE);
15631 }
15632
15633 void RedrawGameButtons()
15634 {
15635   RedrawGameButtonsExt(FALSE);
15636 }
15637
15638 void MapGameButtonsOnTape()
15639 {
15640   MapGameButtonsExt(TRUE);
15641 }
15642
15643 void UnmapGameButtonsOnTape()
15644 {
15645   UnmapGameButtonsExt(TRUE);
15646 }
15647
15648 void RedrawGameButtonsOnTape()
15649 {
15650   RedrawGameButtonsExt(TRUE);
15651 }
15652
15653 void GameUndoRedoExt()
15654 {
15655   ClearPlayerAction();
15656
15657   tape.pausing = TRUE;
15658
15659   RedrawPlayfield();
15660   UpdateAndDisplayGameControlValues();
15661
15662   DrawCompleteVideoDisplay();
15663   DrawVideoDisplay(VIDEO_STATE_TIME_ON, TapeTime);
15664   DrawVideoDisplay(VIDEO_STATE_FRAME_ON, FrameCounter);
15665   DrawVideoDisplay(VIDEO_STATE_1STEP(tape.single_step), 0);
15666
15667   BackToFront();
15668 }
15669
15670 void GameUndo(int steps)
15671 {
15672   if (!CheckEngineSnapshotList())
15673     return;
15674
15675   LoadEngineSnapshot_Undo(steps);
15676
15677   GameUndoRedoExt();
15678 }
15679
15680 void GameRedo(int steps)
15681 {
15682   if (!CheckEngineSnapshotList())
15683     return;
15684
15685   LoadEngineSnapshot_Redo(steps);
15686
15687   GameUndoRedoExt();
15688 }
15689
15690 static void HandleGameButtonsExt(int id, int button)
15691 {
15692   static boolean game_undo_executed = FALSE;
15693   int steps = BUTTON_STEPSIZE(button);
15694   boolean handle_game_buttons =
15695     (game_status == GAME_MODE_PLAYING ||
15696      (game_status == GAME_MODE_MAIN && tape.show_game_buttons));
15697
15698   if (!handle_game_buttons)
15699     return;
15700
15701   switch (id)
15702   {
15703     case GAME_CTRL_ID_STOP:
15704     case GAME_CTRL_ID_PANEL_STOP:
15705       if (game_status == GAME_MODE_MAIN)
15706         break;
15707
15708       if (tape.playing)
15709         TapeStop();
15710       else
15711         RequestQuitGame(TRUE);
15712
15713       break;
15714
15715     case GAME_CTRL_ID_PAUSE:
15716     case GAME_CTRL_ID_PAUSE2:
15717     case GAME_CTRL_ID_PANEL_PAUSE:
15718       if (network.enabled && game_status == GAME_MODE_PLAYING)
15719       {
15720         if (tape.pausing)
15721           SendToServer_ContinuePlaying();
15722         else
15723           SendToServer_PausePlaying();
15724       }
15725       else
15726         TapeTogglePause(TAPE_TOGGLE_MANUAL);
15727
15728       game_undo_executed = FALSE;
15729
15730       break;
15731
15732     case GAME_CTRL_ID_PLAY:
15733     case GAME_CTRL_ID_PANEL_PLAY:
15734       if (game_status == GAME_MODE_MAIN)
15735       {
15736         StartGameActions(network.enabled, setup.autorecord, level.random_seed);
15737       }
15738       else if (tape.pausing)
15739       {
15740         if (network.enabled)
15741           SendToServer_ContinuePlaying();
15742         else
15743           TapeTogglePause(TAPE_TOGGLE_MANUAL | TAPE_TOGGLE_PLAY_PAUSE);
15744       }
15745       break;
15746
15747     case GAME_CTRL_ID_UNDO:
15748       // Important: When using "save snapshot when collecting an item" mode,
15749       // load last (current) snapshot for first "undo" after pressing "pause"
15750       // (else the last-but-one snapshot would be loaded, because the snapshot
15751       // pointer already points to the last snapshot when pressing "pause",
15752       // which is fine for "every step/move" mode, but not for "every collect")
15753       if (game.snapshot.mode == SNAPSHOT_MODE_EVERY_COLLECT &&
15754           !game_undo_executed)
15755         steps--;
15756
15757       game_undo_executed = TRUE;
15758
15759       GameUndo(steps);
15760       break;
15761
15762     case GAME_CTRL_ID_REDO:
15763       GameRedo(steps);
15764       break;
15765
15766     case GAME_CTRL_ID_SAVE:
15767       TapeQuickSave();
15768       break;
15769
15770     case GAME_CTRL_ID_LOAD:
15771       TapeQuickLoad();
15772       break;
15773
15774     case SOUND_CTRL_ID_MUSIC:
15775     case SOUND_CTRL_ID_PANEL_MUSIC:
15776       if (setup.sound_music)
15777       {
15778         setup.sound_music = FALSE;
15779
15780         FadeMusic();
15781       }
15782       else if (audio.music_available)
15783       {
15784         setup.sound = setup.sound_music = TRUE;
15785
15786         SetAudioMode(setup.sound);
15787
15788         if (game_status == GAME_MODE_PLAYING)
15789           PlayLevelMusic();
15790       }
15791
15792       RedrawSoundButtonGadget(id);
15793
15794       break;
15795
15796     case SOUND_CTRL_ID_LOOPS:
15797     case SOUND_CTRL_ID_PANEL_LOOPS:
15798       if (setup.sound_loops)
15799         setup.sound_loops = FALSE;
15800       else if (audio.loops_available)
15801       {
15802         setup.sound = setup.sound_loops = TRUE;
15803
15804         SetAudioMode(setup.sound);
15805       }
15806
15807       RedrawSoundButtonGadget(id);
15808
15809       break;
15810
15811     case SOUND_CTRL_ID_SIMPLE:
15812     case SOUND_CTRL_ID_PANEL_SIMPLE:
15813       if (setup.sound_simple)
15814         setup.sound_simple = FALSE;
15815       else if (audio.sound_available)
15816       {
15817         setup.sound = setup.sound_simple = TRUE;
15818
15819         SetAudioMode(setup.sound);
15820       }
15821
15822       RedrawSoundButtonGadget(id);
15823
15824       break;
15825
15826     default:
15827       break;
15828   }
15829 }
15830
15831 static void HandleGameButtons(struct GadgetInfo *gi)
15832 {
15833   HandleGameButtonsExt(gi->custom_id, gi->event.button);
15834 }
15835
15836 void HandleSoundButtonKeys(Key key)
15837 {
15838   if (key == setup.shortcut.sound_simple)
15839     ClickOnGadget(game_gadget[SOUND_CTRL_ID_SIMPLE], MB_LEFTBUTTON);
15840   else if (key == setup.shortcut.sound_loops)
15841     ClickOnGadget(game_gadget[SOUND_CTRL_ID_LOOPS], MB_LEFTBUTTON);
15842   else if (key == setup.shortcut.sound_music)
15843     ClickOnGadget(game_gadget[SOUND_CTRL_ID_MUSIC], MB_LEFTBUTTON);
15844 }