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_FRAME                        35
 126 #define GAME_PANEL_SHIELD_NORMAL                36
 127 #define GAME_PANEL_SHIELD_NORMAL_TIME           37
 128 #define GAME_PANEL_SHIELD_DEADLY                38
 129 #define GAME_PANEL_SHIELD_DEADLY_TIME           39
 130 #define GAME_PANEL_EXIT                         40
 131 #define GAME_PANEL_EMC_MAGIC_BALL               41
 132 #define GAME_PANEL_EMC_MAGIC_BALL_SWITCH        42
 133 #define GAME_PANEL_LIGHT_SWITCH                 43
 134 #define GAME_PANEL_LIGHT_SWITCH_TIME            44
 135 #define GAME_PANEL_TIMEGATE_SWITCH              45
 136 #define GAME_PANEL_TIMEGATE_SWITCH_TIME         46
 137 #define GAME_PANEL_SWITCHGATE_SWITCH            47
 138 #define GAME_PANEL_EMC_LENSES                   48
 139 #define GAME_PANEL_EMC_LENSES_TIME              49
 140 #define GAME_PANEL_EMC_MAGNIFIER                50
 141 #define GAME_PANEL_EMC_MAGNIFIER_TIME           51
 142 #define GAME_PANEL_BALLOON_SWITCH               52
 143 #define GAME_PANEL_DYNABOMB_NUMBER              53
 144 #define GAME_PANEL_DYNABOMB_SIZE                54
 145 #define GAME_PANEL_DYNABOMB_POWER               55
 146 #define GAME_PANEL_PENGUINS                     56
 147 #define GAME_PANEL_SOKOBAN_OBJECTS              57
 148 #define GAME_PANEL_SOKOBAN_FIELDS               58
 149 #define GAME_PANEL_ROBOT_WHEEL                  59
 150 #define GAME_PANEL_CONVEYOR_BELT_1              60
 151 #define GAME_PANEL_CONVEYOR_BELT_2              61
 152 #define GAME_PANEL_CONVEYOR_BELT_3              62
 153 #define GAME_PANEL_CONVEYOR_BELT_4              63
 154 #define GAME_PANEL_CONVEYOR_BELT_1_SWITCH       64
 155 #define GAME_PANEL_CONVEYOR_BELT_2_SWITCH       65
 156 #define GAME_PANEL_CONVEYOR_BELT_3_SWITCH       66
 157 #define GAME_PANEL_CONVEYOR_BELT_4_SWITCH       67
 158 #define GAME_PANEL_MAGIC_WALL                   68
 159 #define GAME_PANEL_MAGIC_WALL_TIME              69
 160 #define GAME_PANEL_GRAVITY_STATE                70
 161 #define GAME_PANEL_GRAPHIC_1                    71
 162 #define GAME_PANEL_GRAPHIC_2                    72
 163 #define GAME_PANEL_GRAPHIC_3                    73
 164 #define GAME_PANEL_GRAPHIC_4                    74
 165 #define GAME_PANEL_GRAPHIC_5                    75
 166 #define GAME_PANEL_GRAPHIC_6                    76
 167 #define GAME_PANEL_GRAPHIC_7                    77
 168 #define GAME_PANEL_GRAPHIC_8                    78
 169 #define GAME_PANEL_ELEMENT_1                    79
 170 #define GAME_PANEL_ELEMENT_2                    80
 171 #define GAME_PANEL_ELEMENT_3                    81
 172 #define GAME_PANEL_ELEMENT_4                    82
 173 #define GAME_PANEL_ELEMENT_5                    83
 174 #define GAME_PANEL_ELEMENT_6                    84
 175 #define GAME_PANEL_ELEMENT_7                    85
 176 #define GAME_PANEL_ELEMENT_8                    86
 177 #define GAME_PANEL_ELEMENT_COUNT_1              87
 178 #define GAME_PANEL_ELEMENT_COUNT_2              88
 179 #define GAME_PANEL_ELEMENT_COUNT_3              89
 180 #define GAME_PANEL_ELEMENT_COUNT_4              90
 181 #define GAME_PANEL_ELEMENT_COUNT_5              91
 182 #define GAME_PANEL_ELEMENT_COUNT_6              92
 183 #define GAME_PANEL_ELEMENT_COUNT_7              93
 184 #define GAME_PANEL_ELEMENT_COUNT_8              94
 185 #define GAME_PANEL_CE_SCORE_1                   95
 186 #define GAME_PANEL_CE_SCORE_2                   96
 187 #define GAME_PANEL_CE_SCORE_3                   97
 188 #define GAME_PANEL_CE_SCORE_4                   98
 189 #define GAME_PANEL_CE_SCORE_5                   99
 190 #define GAME_PANEL_CE_SCORE_6                   100
 191 #define GAME_PANEL_CE_SCORE_7                   101
 192 #define GAME_PANEL_CE_SCORE_8                   102
 193 #define GAME_PANEL_CE_SCORE_1_ELEMENT           103
 194 #define GAME_PANEL_CE_SCORE_2_ELEMENT           104
 195 #define GAME_PANEL_CE_SCORE_3_ELEMENT           105
 196 #define GAME_PANEL_CE_SCORE_4_ELEMENT           106
 197 #define GAME_PANEL_CE_SCORE_5_ELEMENT           107
 198 #define GAME_PANEL_CE_SCORE_6_ELEMENT           108
 199 #define GAME_PANEL_CE_SCORE_7_ELEMENT           109
 200 #define GAME_PANEL_CE_SCORE_8_ELEMENT           110
 201 #define GAME_PANEL_PLAYER_NAME                  111
 202 #define GAME_PANEL_LEVEL_NAME                   112
 203 #define GAME_PANEL_LEVEL_AUTHOR                 113
 204
 205 #define NUM_GAME_PANEL_CONTROLS                 114
 206
 207 struct GamePanelOrderInfo
 208 {
 209   int nr;
 210   int sort_priority;
 211 };
 212
 213 static struct GamePanelOrderInfo game_panel_order[NUM_GAME_PANEL_CONTROLS];
 214
 215 struct GamePanelControlInfo
 216 {
 217   int nr;
 218
 219   struct TextPosInfo *pos;
 220   int type;
 221
 222   int value, last_value;
 223   int frame, last_frame;
 224   int gfx_frame;
 225   int gfx_random;
 226 };
 227
 228 static struct GamePanelControlInfo game_panel_controls[] =
 229 {
 230   {
 231     GAME_PANEL_LEVEL_NUMBER,
 232     &game.panel.level_number,
 233     TYPE_INTEGER,
 234   },
 235   {
 236     GAME_PANEL_GEMS,
 237     &game.panel.gems,
 238     TYPE_INTEGER,
 239   },
 240   {
 241     GAME_PANEL_INVENTORY_COUNT,
 242     &game.panel.inventory_count,
 243     TYPE_INTEGER,
 244   },
 245   {
 246     GAME_PANEL_INVENTORY_FIRST_1,
 247     &game.panel.inventory_first[0],
 248     TYPE_ELEMENT,
 249   },
 250   {
 251     GAME_PANEL_INVENTORY_FIRST_2,
 252     &game.panel.inventory_first[1],
 253     TYPE_ELEMENT,
 254   },
 255   {
 256     GAME_PANEL_INVENTORY_FIRST_3,
 257     &game.panel.inventory_first[2],
 258     TYPE_ELEMENT,
 259   },
 260   {
 261     GAME_PANEL_INVENTORY_FIRST_4,
 262     &game.panel.inventory_first[3],
 263     TYPE_ELEMENT,
 264   },
 265   {
 266     GAME_PANEL_INVENTORY_FIRST_5,
 267     &game.panel.inventory_first[4],
 268     TYPE_ELEMENT,
 269   },
 270   {
 271     GAME_PANEL_INVENTORY_FIRST_6,
 272     &game.panel.inventory_first[5],
 273     TYPE_ELEMENT,
 274   },
 275   {
 276     GAME_PANEL_INVENTORY_FIRST_7,
 277     &game.panel.inventory_first[6],
 278     TYPE_ELEMENT,
 279   },
 280   {
 281     GAME_PANEL_INVENTORY_FIRST_8,
 282     &game.panel.inventory_first[7],
 283     TYPE_ELEMENT,
 284   },
 285   {
 286     GAME_PANEL_INVENTORY_LAST_1,
 287     &game.panel.inventory_last[0],
 288     TYPE_ELEMENT,
 289   },
 290   {
 291     GAME_PANEL_INVENTORY_LAST_2,
 292     &game.panel.inventory_last[1],
 293     TYPE_ELEMENT,
 294   },
 295   {
 296     GAME_PANEL_INVENTORY_LAST_3,
 297     &game.panel.inventory_last[2],
 298     TYPE_ELEMENT,
 299   },
 300   {
 301     GAME_PANEL_INVENTORY_LAST_4,
 302     &game.panel.inventory_last[3],
 303     TYPE_ELEMENT,
 304   },
 305   {
 306     GAME_PANEL_INVENTORY_LAST_5,
 307     &game.panel.inventory_last[4],
 308     TYPE_ELEMENT,
 309   },
 310   {
 311     GAME_PANEL_INVENTORY_LAST_6,
 312     &game.panel.inventory_last[5],
 313     TYPE_ELEMENT,
 314   },
 315   {
 316     GAME_PANEL_INVENTORY_LAST_7,
 317     &game.panel.inventory_last[6],
 318     TYPE_ELEMENT,
 319   },
 320   {
 321     GAME_PANEL_INVENTORY_LAST_8,
 322     &game.panel.inventory_last[7],
 323     TYPE_ELEMENT,
 324   },
 325   {
 326     GAME_PANEL_KEY_1,
 327     &game.panel.key[0],
 328     TYPE_ELEMENT,
 329   },
 330   {
 331     GAME_PANEL_KEY_2,
 332     &game.panel.key[1],
 333     TYPE_ELEMENT,
 334   },
 335   {
 336     GAME_PANEL_KEY_3,
 337     &game.panel.key[2],
 338     TYPE_ELEMENT,
 339   },
 340   {
 341     GAME_PANEL_KEY_4,
 342     &game.panel.key[3],
 343     TYPE_ELEMENT,
 344   },
 345   {
 346     GAME_PANEL_KEY_5,
 347     &game.panel.key[4],
 348     TYPE_ELEMENT,
 349   },
 350   {
 351     GAME_PANEL_KEY_6,
 352     &game.panel.key[5],
 353     TYPE_ELEMENT,
 354   },
 355   {
 356     GAME_PANEL_KEY_7,
 357     &game.panel.key[6],
 358     TYPE_ELEMENT,
 359   },
 360   {
 361     GAME_PANEL_KEY_8,
 362     &game.panel.key[7],
 363     TYPE_ELEMENT,
 364   },
 365   {
 366     GAME_PANEL_KEY_WHITE,
 367     &game.panel.key_white,
 368     TYPE_ELEMENT,
 369   },
 370   {
 371     GAME_PANEL_KEY_WHITE_COUNT,
 372     &game.panel.key_white_count,
 373     TYPE_INTEGER,
 374   },
 375   {
 376     GAME_PANEL_SCORE,
 377     &game.panel.score,
 378     TYPE_INTEGER,
 379   },
 380   {
 381     GAME_PANEL_HIGHSCORE,
 382     &game.panel.highscore,
 383     TYPE_INTEGER,
 384   },
 385   {
 386     GAME_PANEL_TIME,
 387     &game.panel.time,
 388     TYPE_INTEGER,
 389   },
 390   {
 391     GAME_PANEL_TIME_HH,
 392     &game.panel.time_hh,
 393     TYPE_INTEGER,
 394   },
 395   {
 396     GAME_PANEL_TIME_MM,
 397     &game.panel.time_mm,
 398     TYPE_INTEGER,
 399   },
 400   {
 401     GAME_PANEL_TIME_SS,
 402     &game.panel.time_ss,
 403     TYPE_INTEGER,
 404   },
 405   {
 406     GAME_PANEL_FRAME,
 407     &game.panel.frame,
 408     TYPE_INTEGER,
 409   },
 410   {
 411     GAME_PANEL_SHIELD_NORMAL,
 412     &game.panel.shield_normal,
 413     TYPE_ELEMENT,
 414   },
 415   {
 416     GAME_PANEL_SHIELD_NORMAL_TIME,
 417     &game.panel.shield_normal_time,
 418     TYPE_INTEGER,
 419   },
 420   {
 421     GAME_PANEL_SHIELD_DEADLY,
 422     &game.panel.shield_deadly,
 423     TYPE_ELEMENT,
 424   },
 425   {
 426     GAME_PANEL_SHIELD_DEADLY_TIME,
 427     &game.panel.shield_deadly_time,
 428     TYPE_INTEGER,
 429   },
 430   {
 431     GAME_PANEL_EXIT,
 432     &game.panel.exit,
 433     TYPE_ELEMENT,
 434   },
 435   {
 436     GAME_PANEL_EMC_MAGIC_BALL,
 437     &game.panel.emc_magic_ball,
 438     TYPE_ELEMENT,
 439   },
 440   {
 441     GAME_PANEL_EMC_MAGIC_BALL_SWITCH,
 442     &game.panel.emc_magic_ball_switch,
 443     TYPE_ELEMENT,
 444   },
 445   {
 446     GAME_PANEL_LIGHT_SWITCH,
 447     &game.panel.light_switch,
 448     TYPE_ELEMENT,
 449   },
 450   {
 451     GAME_PANEL_LIGHT_SWITCH_TIME,
 452     &game.panel.light_switch_time,
 453     TYPE_INTEGER,
 454   },
 455   {
 456     GAME_PANEL_TIMEGATE_SWITCH,
 457     &game.panel.timegate_switch,
 458     TYPE_ELEMENT,
 459   },
 460   {
 461     GAME_PANEL_TIMEGATE_SWITCH_TIME,
 462     &game.panel.timegate_switch_time,
 463     TYPE_INTEGER,
 464   },
 465   {
 466     GAME_PANEL_SWITCHGATE_SWITCH,
 467     &game.panel.switchgate_switch,
 468     TYPE_ELEMENT,
 469   },
 470   {
 471     GAME_PANEL_EMC_LENSES,
 472     &game.panel.emc_lenses,
 473     TYPE_ELEMENT,
 474   },
 475   {
 476     GAME_PANEL_EMC_LENSES_TIME,
 477     &game.panel.emc_lenses_time,
 478     TYPE_INTEGER,
 479   },
 480   {
 481     GAME_PANEL_EMC_MAGNIFIER,
 482     &game.panel.emc_magnifier,
 483     TYPE_ELEMENT,
 484   },
 485   {
 486     GAME_PANEL_EMC_MAGNIFIER_TIME,
 487     &game.panel.emc_magnifier_time,
 488     TYPE_INTEGER,
 489   },
 490   {
 491     GAME_PANEL_BALLOON_SWITCH,
 492     &game.panel.balloon_switch,
 493     TYPE_ELEMENT,
 494   },
 495   {
 496     GAME_PANEL_DYNABOMB_NUMBER,
 497     &game.panel.dynabomb_number,
 498     TYPE_INTEGER,
 499   },
 500   {
 501     GAME_PANEL_DYNABOMB_SIZE,
 502     &game.panel.dynabomb_size,
 503     TYPE_INTEGER,
 504   },
 505   {
 506     GAME_PANEL_DYNABOMB_POWER,
 507     &game.panel.dynabomb_power,
 508     TYPE_ELEMENT,
 509   },
 510   {
 511     GAME_PANEL_PENGUINS,
 512     &game.panel.penguins,
 513     TYPE_INTEGER,
 514   },
 515   {
 516     GAME_PANEL_SOKOBAN_OBJECTS,
 517     &game.panel.sokoban_objects,
 518     TYPE_INTEGER,
 519   },
 520   {
 521     GAME_PANEL_SOKOBAN_FIELDS,
 522     &game.panel.sokoban_fields,
 523     TYPE_INTEGER,
 524   },
 525   {
 526     GAME_PANEL_ROBOT_WHEEL,
 527     &game.panel.robot_wheel,
 528     TYPE_ELEMENT,
 529   },
 530   {
 531     GAME_PANEL_CONVEYOR_BELT_1,
 532     &game.panel.conveyor_belt[0],
 533     TYPE_ELEMENT,
 534   },
 535   {
 536     GAME_PANEL_CONVEYOR_BELT_2,
 537     &game.panel.conveyor_belt[1],
 538     TYPE_ELEMENT,
 539   },
 540   {
 541     GAME_PANEL_CONVEYOR_BELT_3,
 542     &game.panel.conveyor_belt[2],
 543     TYPE_ELEMENT,
 544   },
 545   {
 546     GAME_PANEL_CONVEYOR_BELT_4,
 547     &game.panel.conveyor_belt[3],
 548     TYPE_ELEMENT,
 549   },
 550   {
 551     GAME_PANEL_CONVEYOR_BELT_1_SWITCH,
 552     &game.panel.conveyor_belt_switch[0],
 553     TYPE_ELEMENT,
 554   },
 555   {
 556     GAME_PANEL_CONVEYOR_BELT_2_SWITCH,
 557     &game.panel.conveyor_belt_switch[1],
 558     TYPE_ELEMENT,
 559   },
 560   {
 561     GAME_PANEL_CONVEYOR_BELT_3_SWITCH,
 562     &game.panel.conveyor_belt_switch[2],
 563     TYPE_ELEMENT,
 564   },
 565   {
 566     GAME_PANEL_CONVEYOR_BELT_4_SWITCH,
 567     &game.panel.conveyor_belt_switch[3],
 568     TYPE_ELEMENT,
 569   },
 570   {
 571     GAME_PANEL_MAGIC_WALL,
 572     &game.panel.magic_wall,
 573     TYPE_ELEMENT,
 574   },
 575   {
 576     GAME_PANEL_MAGIC_WALL_TIME,
 577     &game.panel.magic_wall_time,
 578     TYPE_INTEGER,
 579   },
 580   {
 581     GAME_PANEL_GRAVITY_STATE,
 582     &game.panel.gravity_state,
 583     TYPE_STRING,
 584   },
 585   {
 586     GAME_PANEL_GRAPHIC_1,
 587     &game.panel.graphic[0],
 588     TYPE_ELEMENT,
 589   },
 590   {
 591     GAME_PANEL_GRAPHIC_2,
 592     &game.panel.graphic[1],
 593     TYPE_ELEMENT,
 594   },
 595   {
 596     GAME_PANEL_GRAPHIC_3,
 597     &game.panel.graphic[2],
 598     TYPE_ELEMENT,
 599   },
 600   {
 601     GAME_PANEL_GRAPHIC_4,
 602     &game.panel.graphic[3],
 603     TYPE_ELEMENT,
 604   },
 605   {
 606     GAME_PANEL_GRAPHIC_5,
 607     &game.panel.graphic[4],
 608     TYPE_ELEMENT,
 609   },
 610   {
 611     GAME_PANEL_GRAPHIC_6,
 612     &game.panel.graphic[5],
 613     TYPE_ELEMENT,
 614   },
 615   {
 616     GAME_PANEL_GRAPHIC_7,
 617     &game.panel.graphic[6],
 618     TYPE_ELEMENT,
 619   },
 620   {
 621     GAME_PANEL_GRAPHIC_8,
 622     &game.panel.graphic[7],
 623     TYPE_ELEMENT,
 624   },
 625   {
 626     GAME_PANEL_ELEMENT_1,
 627     &game.panel.element[0],
 628     TYPE_ELEMENT,
 629   },
 630   {
 631     GAME_PANEL_ELEMENT_2,
 632     &game.panel.element[1],
 633     TYPE_ELEMENT,
 634   },
 635   {
 636     GAME_PANEL_ELEMENT_3,
 637     &game.panel.element[2],
 638     TYPE_ELEMENT,
 639   },
 640   {
 641     GAME_PANEL_ELEMENT_4,
 642     &game.panel.element[3],
 643     TYPE_ELEMENT,
 644   },
 645   {
 646     GAME_PANEL_ELEMENT_5,
 647     &game.panel.element[4],
 648     TYPE_ELEMENT,
 649   },
 650   {
 651     GAME_PANEL_ELEMENT_6,
 652     &game.panel.element[5],
 653     TYPE_ELEMENT,
 654   },
 655   {
 656     GAME_PANEL_ELEMENT_7,
 657     &game.panel.element[6],
 658     TYPE_ELEMENT,
 659   },
 660   {
 661     GAME_PANEL_ELEMENT_8,
 662     &game.panel.element[7],
 663     TYPE_ELEMENT,
 664   },
 665   {
 666     GAME_PANEL_ELEMENT_COUNT_1,
 667     &game.panel.element_count[0],
 668     TYPE_INTEGER,
 669   },
 670   {
 671     GAME_PANEL_ELEMENT_COUNT_2,
 672     &game.panel.element_count[1],
 673     TYPE_INTEGER,
 674   },
 675   {
 676     GAME_PANEL_ELEMENT_COUNT_3,
 677     &game.panel.element_count[2],
 678     TYPE_INTEGER,
 679   },
 680   {
 681     GAME_PANEL_ELEMENT_COUNT_4,
 682     &game.panel.element_count[3],
 683     TYPE_INTEGER,
 684   },
 685   {
 686     GAME_PANEL_ELEMENT_COUNT_5,
 687     &game.panel.element_count[4],
 688     TYPE_INTEGER,
 689   },
 690   {
 691     GAME_PANEL_ELEMENT_COUNT_6,
 692     &game.panel.element_count[5],
 693     TYPE_INTEGER,
 694   },
 695   {
 696     GAME_PANEL_ELEMENT_COUNT_7,
 697     &game.panel.element_count[6],
 698     TYPE_INTEGER,
 699   },
 700   {
 701     GAME_PANEL_ELEMENT_COUNT_8,
 702     &game.panel.element_count[7],
 703     TYPE_INTEGER,
 704   },
 705   {
 706     GAME_PANEL_CE_SCORE_1,
 707     &game.panel.ce_score[0],
 708     TYPE_INTEGER,
 709   },
 710   {
 711     GAME_PANEL_CE_SCORE_2,
 712     &game.panel.ce_score[1],
 713     TYPE_INTEGER,
 714   },
 715   {
 716     GAME_PANEL_CE_SCORE_3,
 717     &game.panel.ce_score[2],
 718     TYPE_INTEGER,
 719   },
 720   {
 721     GAME_PANEL_CE_SCORE_4,
 722     &game.panel.ce_score[3],
 723     TYPE_INTEGER,
 724   },
 725   {
 726     GAME_PANEL_CE_SCORE_5,
 727     &game.panel.ce_score[4],
 728     TYPE_INTEGER,
 729   },
 730   {
 731     GAME_PANEL_CE_SCORE_6,
 732     &game.panel.ce_score[5],
 733     TYPE_INTEGER,
 734   },
 735   {
 736     GAME_PANEL_CE_SCORE_7,
 737     &game.panel.ce_score[6],
 738     TYPE_INTEGER,
 739   },
 740   {
 741     GAME_PANEL_CE_SCORE_8,
 742     &game.panel.ce_score[7],
 743     TYPE_INTEGER,
 744   },
 745   {
 746     GAME_PANEL_CE_SCORE_1_ELEMENT,
 747     &game.panel.ce_score_element[0],
 748     TYPE_ELEMENT,
 749   },
 750   {
 751     GAME_PANEL_CE_SCORE_2_ELEMENT,
 752     &game.panel.ce_score_element[1],
 753     TYPE_ELEMENT,
 754   },
 755   {
 756     GAME_PANEL_CE_SCORE_3_ELEMENT,
 757     &game.panel.ce_score_element[2],
 758     TYPE_ELEMENT,
 759   },
 760   {
 761     GAME_PANEL_CE_SCORE_4_ELEMENT,
 762     &game.panel.ce_score_element[3],
 763     TYPE_ELEMENT,
 764   },
 765   {
 766     GAME_PANEL_CE_SCORE_5_ELEMENT,
 767     &game.panel.ce_score_element[4],
 768     TYPE_ELEMENT,
 769   },
 770   {
 771     GAME_PANEL_CE_SCORE_6_ELEMENT,
 772     &game.panel.ce_score_element[5],
 773     TYPE_ELEMENT,
 774   },
 775   {
 776     GAME_PANEL_CE_SCORE_7_ELEMENT,
 777     &game.panel.ce_score_element[6],
 778     TYPE_ELEMENT,
 779   },
 780   {
 781     GAME_PANEL_CE_SCORE_8_ELEMENT,
 782     &game.panel.ce_score_element[7],
 783     TYPE_ELEMENT,
 784   },
 785   {
 786     GAME_PANEL_PLAYER_NAME,
 787     &game.panel.player_name,
 788     TYPE_STRING,
 789   },
 790   {
 791     GAME_PANEL_LEVEL_NAME,
 792     &game.panel.level_name,
 793     TYPE_STRING,
 794   },
 795   {
 796     GAME_PANEL_LEVEL_AUTHOR,
 797     &game.panel.level_author,
 798     TYPE_STRING,
 799   },
 800
 801   {
 802     -1,
 803     NULL,
 804     -1,
 805   }
 806 };
 807
 808 /* values for delayed check of falling and moving elements and for collision */
 809 #define CHECK_DELAY_MOVING      3
 810 #define CHECK_DELAY_FALLING     CHECK_DELAY_MOVING
 811 #define CHECK_DELAY_COLLISION   2
 812 #define CHECK_DELAY_IMPACT      CHECK_DELAY_COLLISION
 813
 814 /* values for initial player move delay (initial delay counter value) */
 815 #define INITIAL_MOVE_DELAY_OFF  -1
 816 #define INITIAL_MOVE_DELAY_ON   0
 817
 818 /* values for player movement speed (which is in fact a delay value) */
 819 #define MOVE_DELAY_MIN_SPEED    32
 820 #define MOVE_DELAY_NORMAL_SPEED 8
 821 #define MOVE_DELAY_HIGH_SPEED   4
 822 #define MOVE_DELAY_MAX_SPEED    1
 823
 824 #define DOUBLE_MOVE_DELAY(x)    (x = (x < MOVE_DELAY_MIN_SPEED ? x * 2 : x))
 825 #define HALVE_MOVE_DELAY(x)     (x = (x > MOVE_DELAY_MAX_SPEED ? x / 2 : x))
 826
 827 #define DOUBLE_PLAYER_SPEED(p)  (HALVE_MOVE_DELAY( (p)->move_delay_value))
 828 #define HALVE_PLAYER_SPEED(p)   (DOUBLE_MOVE_DELAY((p)->move_delay_value))
 829
 830 /* values for scroll positions */
 831 #define SCROLL_POSITION_X(x)    ((x) < SBX_Left  + MIDPOSX ? SBX_Left : \
 832                                  (x) > SBX_Right + MIDPOSX ? SBX_Right :\
 833                                  (x) - MIDPOSX)
 834 #define SCROLL_POSITION_Y(y)    ((y) < SBY_Upper + MIDPOSY ? SBY_Upper :\
 835                                  (y) > SBY_Lower + MIDPOSY ? SBY_Lower :\
 836                                  (y) - MIDPOSY)
 837
 838 /* values for other actions */
 839 #define MOVE_STEPSIZE_NORMAL    (TILEX / MOVE_DELAY_NORMAL_SPEED)
 840 #define MOVE_STEPSIZE_MIN       (1)
 841 #define MOVE_STEPSIZE_MAX       (TILEX)
 842
 843 #define GET_DX_FROM_DIR(d)      ((d) == MV_LEFT ? -1 : (d) == MV_RIGHT ? 1 : 0)
 844 #define GET_DY_FROM_DIR(d)      ((d) == MV_UP   ? -1 : (d) == MV_DOWN  ? 1 : 0)
 845
 846 #define INIT_GFX_RANDOM()       (GetSimpleRandom(1000000))
 847
 848 #define GET_NEW_PUSH_DELAY(e)   (   (element_info[e].push_delay_fixed) + \
 849                                  RND(element_info[e].push_delay_random))
 850 #define GET_NEW_DROP_DELAY(e)   (   (element_info[e].drop_delay_fixed) + \
 851                                  RND(element_info[e].drop_delay_random))
 852 #define GET_NEW_MOVE_DELAY(e)   (   (element_info[e].move_delay_fixed) + \
 853                                  RND(element_info[e].move_delay_random))
 854 #define GET_MAX_MOVE_DELAY(e)   (   (element_info[e].move_delay_fixed) + \
 855                                     (element_info[e].move_delay_random))
 856 #define GET_NEW_CE_VALUE(e)     (   (element_info[e].ce_value_fixed_initial) +\
 857                                  RND(element_info[e].ce_value_random_initial))
 858 #define GET_CE_SCORE(e)         (   (element_info[e].collect_score))
 859 #define GET_CHANGE_DELAY(c)     (   ((c)->delay_fixed  * (c)->delay_frames) + \
 860                                  RND((c)->delay_random * (c)->delay_frames))
 861 #define GET_CE_DELAY_VALUE(c)   (   ((c)->delay_fixed) + \
 862                                  RND((c)->delay_random))
 863
 864
 865 #define GET_VALID_RUNTIME_ELEMENT(e)                                    \
 866          ((e) >= NUM_RUNTIME_ELEMENTS ? EL_UNKNOWN : (e))
 867
 868 #define RESOLVED_REFERENCE_ELEMENT(be, e)                               \
 869         ((be) + (e) - EL_SELF < EL_CUSTOM_START ? EL_CUSTOM_START :     \
 870          (be) + (e) - EL_SELF > EL_CUSTOM_END   ? EL_CUSTOM_END :       \
 871          (be) + (e) - EL_SELF)
 872
 873 #define GET_PLAYER_FROM_BITS(p)                                         \
 874         (EL_PLAYER_1 + ((p) != PLAYER_BITS_ANY ? log_2(p) : 0))
 875
 876 #define GET_TARGET_ELEMENT(be, e, ch, cv, cs)                           \
 877         ((e) == EL_TRIGGER_PLAYER   ? (ch)->actual_trigger_player    :  \
 878          (e) == EL_TRIGGER_ELEMENT  ? (ch)->actual_trigger_element   :  \
 879          (e) == EL_TRIGGER_CE_VALUE ? (ch)->actual_trigger_ce_value  :  \
 880          (e) == EL_TRIGGER_CE_SCORE ? (ch)->actual_trigger_ce_score  :  \
 881          (e) == EL_CURRENT_CE_VALUE ? (cv) :                            \
 882          (e) == EL_CURRENT_CE_SCORE ? (cs) :                            \
 883          (e) >= EL_PREV_CE_8 && (e) <= EL_NEXT_CE_8 ?                   \
 884          RESOLVED_REFERENCE_ELEMENT(be, e) :                            \
 885          (e))
 886
 887 #define CAN_GROW_INTO(e)                                                \
 888         ((e) == EL_SAND || (IS_DIGGABLE(e) && level.grow_into_diggable))
 889
 890 #define ELEMENT_CAN_ENTER_FIELD_BASE_X(x, y, condition)                 \
 891                 (IN_LEV_FIELD(x, y) && (IS_FREE(x, y) ||                \
 892                                         (condition)))
 893
 894 #define ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, condition)              \
 895                 (IN_LEV_FIELD(x, y) && (IS_FREE(x, y) ||                \
 896                                         (CAN_MOVE_INTO_ACID(e) &&       \
 897                                          Feld[x][y] == EL_ACID) ||      \
 898                                         (condition)))
 899
 900 #define ELEMENT_CAN_ENTER_FIELD_BASE_3(e, x, y, condition)              \
 901                 (IN_LEV_FIELD(x, y) && (IS_FREE_OR_PLAYER(x, y) ||      \
 902                                         (CAN_MOVE_INTO_ACID(e) &&       \
 903                                          Feld[x][y] == EL_ACID) ||      \
 904                                         (condition)))
 905
 906 #define ELEMENT_CAN_ENTER_FIELD_BASE_4(e, x, y, condition)              \
 907                 (IN_LEV_FIELD(x, y) && (IS_FREE(x, y) ||                \
 908                                         (condition) ||                  \
 909                                         (CAN_MOVE_INTO_ACID(e) &&       \
 910                                          Feld[x][y] == EL_ACID) ||      \
 911                                         (DONT_COLLIDE_WITH(e) &&        \
 912                                          IS_PLAYER(x, y) &&             \
 913                                          !PLAYER_ENEMY_PROTECTED(x, y))))
 914
 915 #define ELEMENT_CAN_ENTER_FIELD(e, x, y)                                \
 916         ELEMENT_CAN_ENTER_FIELD_BASE_4(e, x, y, 0)
 917
 918 #define SATELLITE_CAN_ENTER_FIELD(x, y)                                 \
 919         ELEMENT_CAN_ENTER_FIELD_BASE_2(EL_SATELLITE, x, y, 0)
 920
 921 #define ANDROID_CAN_ENTER_FIELD(e, x, y)                                \
 922         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, Feld[x][y] == EL_EMC_PLANT)
 923
 924 #define ANDROID_CAN_CLONE_FIELD(x, y)                                   \
 925         (IN_LEV_FIELD(x, y) && (CAN_BE_CLONED_BY_ANDROID(Feld[x][y]) || \
 926                                 CAN_BE_CLONED_BY_ANDROID(EL_TRIGGER_ELEMENT)))
 927
 928 #define ENEMY_CAN_ENTER_FIELD(e, x, y)                                  \
 929         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, 0)
 930
 931 #define YAMYAM_CAN_ENTER_FIELD(e, x, y)                                 \
 932         ELEMENT_CAN_ENTER_FIELD_BASE_3(e, x, y, Feld[x][y] == EL_DIAMOND)
 933
 934 #define DARK_YAMYAM_CAN_ENTER_FIELD(e, x, y)                            \
 935         ELEMENT_CAN_ENTER_FIELD_BASE_3(e, x,y, IS_FOOD_DARK_YAMYAM(Feld[x][y]))
 936
 937 #define PACMAN_CAN_ENTER_FIELD(e, x, y)                                 \
 938         ELEMENT_CAN_ENTER_FIELD_BASE_3(e, x, y, IS_AMOEBOID(Feld[x][y]))
 939
 940 #define PIG_CAN_ENTER_FIELD(e, x, y)                                    \
 941         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, IS_FOOD_PIG(Feld[x][y]))
 942
 943 #define PENGUIN_CAN_ENTER_FIELD(e, x, y)                                \
 944         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, (Feld[x][y] == EL_EXIT_OPEN || \
 945                                                  Feld[x][y] == EL_EM_EXIT_OPEN || \
 946                                                  Feld[x][y] == EL_STEEL_EXIT_OPEN || \
 947                                                  Feld[x][y] == EL_EM_STEEL_EXIT_OPEN || \
 948                                                  IS_FOOD_PENGUIN(Feld[x][y])))
 949 #define DRAGON_CAN_ENTER_FIELD(e, x, y)                                 \
 950         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, 0)
 951
 952 #define MOLE_CAN_ENTER_FIELD(e, x, y, condition)                        \
 953         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, (condition))
 954
 955 #define SPRING_CAN_ENTER_FIELD(e, x, y)                                 \
 956         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, 0)
 957
 958 #define SPRING_CAN_BUMP_FROM_FIELD(x, y)                                \
 959         (IN_LEV_FIELD(x, y) && (Feld[x][y] == EL_EMC_SPRING_BUMPER ||   \
 960                                 Feld[x][y] == EL_EMC_SPRING_BUMPER_ACTIVE))
 961
 962 #define MOVE_ENTER_EL(e)        (element_info[e].move_enter_element)
 963
 964 #define CE_ENTER_FIELD_COND(e, x, y)                                    \
 965                 (!IS_PLAYER(x, y) &&                                    \
 966                  IS_EQUAL_OR_IN_GROUP(Feld[x][y], MOVE_ENTER_EL(e)))
 967
 968 #define CUSTOM_ELEMENT_CAN_ENTER_FIELD(e, x, y)                         \
 969         ELEMENT_CAN_ENTER_FIELD_BASE_4(e, x, y, CE_ENTER_FIELD_COND(e, x, y))
 970
 971 #define IN_LEV_FIELD_AND_IS_FREE(x, y)  (IN_LEV_FIELD(x, y) &&  IS_FREE(x, y))
 972 #define IN_LEV_FIELD_AND_NOT_FREE(x, y) (IN_LEV_FIELD(x, y) && !IS_FREE(x, y))
 973
 974 #define ACCESS_FROM(e, d)               (element_info[e].access_direction &(d))
 975 #define IS_WALKABLE_FROM(e, d)          (IS_WALKABLE(e)   && ACCESS_FROM(e, d))
 976 #define IS_PASSABLE_FROM(e, d)          (IS_PASSABLE(e)   && ACCESS_FROM(e, d))
 977 #define IS_ACCESSIBLE_FROM(e, d)        (IS_ACCESSIBLE(e) && ACCESS_FROM(e, d))
 978
 979 /* game button identifiers */
 980 #define GAME_CTRL_ID_STOP               0
 981 #define GAME_CTRL_ID_PAUSE              1
 982 #define GAME_CTRL_ID_PLAY               2
 983 #define GAME_CTRL_ID_UNDO               3
 984 #define GAME_CTRL_ID_REDO               4
 985 #define GAME_CTRL_ID_SAVE               5
 986 #define GAME_CTRL_ID_PAUSE2             6
 987 #define GAME_CTRL_ID_LOAD               7
 988 #define SOUND_CTRL_ID_MUSIC             8
 989 #define SOUND_CTRL_ID_LOOPS             9
 990 #define SOUND_CTRL_ID_SIMPLE            10
 991
 992 #define NUM_GAME_BUTTONS                11
 993
 994
 995 /* forward declaration for internal use */
 996
 997 static void CreateField(int, int, int);
 998
 999 static void ResetGfxAnimation(int, int);
1000
1001 static void SetPlayerWaiting(struct PlayerInfo *, boolean);
1002 static void AdvanceFrameAndPlayerCounters(int);
1003
1004 static boolean MovePlayerOneStep(struct PlayerInfo *, int, int, int, int);
1005 static boolean MovePlayer(struct PlayerInfo *, int, int);
1006 static void ScrollPlayer(struct PlayerInfo *, int);
1007 static void ScrollScreen(struct PlayerInfo *, int);
1008
1009 static int DigField(struct PlayerInfo *, int, int, int, int, int, int, int);
1010 static boolean DigFieldByCE(int, int, int);
1011 static boolean SnapField(struct PlayerInfo *, int, int);
1012 static boolean DropElement(struct PlayerInfo *);
1013
1014 static void InitBeltMovement(void);
1015 static void CloseAllOpenTimegates(void);
1016 static void CheckGravityMovement(struct PlayerInfo *);
1017 static void CheckGravityMovementWhenNotMoving(struct PlayerInfo *);
1018 static void KillPlayerUnlessEnemyProtected(int, int);
1019 static void KillPlayerUnlessExplosionProtected(int, int);
1020
1021 static void TestIfPlayerTouchesCustomElement(int, int);
1022 static void TestIfElementTouchesCustomElement(int, int);
1023 static void TestIfElementHitsCustomElement(int, int, int);
1024
1025 static void HandleElementChange(int, int, int);
1026 static void ExecuteCustomElementAction(int, int, int, int);
1027 static boolean ChangeElement(int, int, int, int);
1028
1029 static boolean CheckTriggeredElementChangeExt(int, int, int, int, int,int,int);
1030 #define CheckTriggeredElementChange(x, y, e, ev)                        \
1031         CheckTriggeredElementChangeExt(x,y,e,ev, CH_PLAYER_ANY,CH_SIDE_ANY, -1)
1032 #define CheckTriggeredElementChangeByPlayer(x, y, e, ev, p, s)          \
1033         CheckTriggeredElementChangeExt(x, y, e, ev, p, s, -1)
1034 #define CheckTriggeredElementChangeBySide(x, y, e, ev, s)               \
1035         CheckTriggeredElementChangeExt(x, y, e, ev, CH_PLAYER_ANY, s, -1)
1036 #define CheckTriggeredElementChangeByPage(x, y, e, ev, p)               \
1037         CheckTriggeredElementChangeExt(x,y,e,ev, CH_PLAYER_ANY, CH_SIDE_ANY, p)
1038
1039 static boolean CheckElementChangeExt(int, int, int, int, int, int, int);
1040 #define CheckElementChange(x, y, e, te, ev)                             \
1041         CheckElementChangeExt(x, y, e, te, ev, CH_PLAYER_ANY, CH_SIDE_ANY)
1042 #define CheckElementChangeByPlayer(x, y, e, ev, p, s)                   \
1043         CheckElementChangeExt(x, y, e, EL_EMPTY, ev, p, s)
1044 #define CheckElementChangeBySide(x, y, e, te, ev, s)                    \
1045         CheckElementChangeExt(x, y, e, te, ev, CH_PLAYER_ANY, s)
1046
1047 static void PlayLevelSound(int, int, int);
1048 static void PlayLevelSoundNearest(int, int, int);
1049 static void PlayLevelSoundAction(int, int, int);
1050 static void PlayLevelSoundElementAction(int, int, int, int);
1051 static void PlayLevelSoundElementActionIfLoop(int, int, int, int);
1052 static void PlayLevelSoundActionIfLoop(int, int, int);
1053 static void StopLevelSoundActionIfLoop(int, int, int);
1054 static void PlayLevelMusic();
1055
1056 static void HandleGameButtons(struct GadgetInfo *);
1057
1058 int AmoebeNachbarNr(int, int);
1059 void AmoebeUmwandeln(int, int);
1060 void ContinueMoving(int, int);
1061 void Bang(int, int);
1062 void InitMovDir(int, int);
1063 void InitAmoebaNr(int, int);
1064 int NewHiScore(void);
1065
1066 void TestIfGoodThingHitsBadThing(int, int, int);
1067 void TestIfBadThingHitsGoodThing(int, int, int);
1068 void TestIfPlayerTouchesBadThing(int, int);
1069 void TestIfPlayerRunsIntoBadThing(int, int, int);
1070 void TestIfBadThingTouchesPlayer(int, int);
1071 void TestIfBadThingRunsIntoPlayer(int, int, int);
1072 void TestIfFriendTouchesBadThing(int, int);
1073 void TestIfBadThingTouchesFriend(int, int);
1074 void TestIfBadThingTouchesOtherBadThing(int, int);
1075 void TestIfGoodThingGetsHitByBadThing(int, int, int);
1076
1077 void KillPlayer(struct PlayerInfo *);
1078 void BuryPlayer(struct PlayerInfo *);
1079 void RemovePlayer(struct PlayerInfo *);
1080
1081 static int getInvisibleActiveFromInvisibleElement(int);
1082 static int getInvisibleFromInvisibleActiveElement(int);
1083
1084 static struct GadgetInfo *game_gadget[NUM_GAME_BUTTONS];
1085
1086 /* for detection of endless loops, caused by custom element programming */
1087 /* (using maximal playfield width x 10 is just a rough approximation) */
1088 #define MAX_ELEMENT_CHANGE_RECURSION_DEPTH      (MAX_PLAYFIELD_WIDTH * 10)
1089
1090 #define RECURSION_LOOP_DETECTION_START(e, rc)                           \
1091 {                                                                       \
1092   if (recursion_loop_detected)                                          \
1093     return (rc);                                                        \
1094                                                                         \
1095   if (recursion_loop_depth > MAX_ELEMENT_CHANGE_RECURSION_DEPTH)        \
1096   {                                                                     \
1097     recursion_loop_detected = TRUE;                                     \
1098     recursion_loop_element = (e);                                       \
1099   }                                                                     \
1100                                                                         \
1101   recursion_loop_depth++;                                               \
1102 }
1103
1104 #define RECURSION_LOOP_DETECTION_END()                                  \
1105 {                                                                       \
1106   recursion_loop_depth--;                                               \
1107 }
1108
1109 static int recursion_loop_depth;
1110 static boolean recursion_loop_detected;
1111 static boolean recursion_loop_element;
1112
1113 static int map_player_action[MAX_PLAYERS];
1114
1115
1116 /* ------------------------------------------------------------------------- */
1117 /* definition of elements that automatically change to other elements after  */
1118 /* a specified time, eventually calling a function when changing             */
1119 /* ------------------------------------------------------------------------- */
1120
1121 /* forward declaration for changer functions */
1122 static void InitBuggyBase(int, int);
1123 static void WarnBuggyBase(int, int);
1124
1125 static void InitTrap(int, int);
1126 static void ActivateTrap(int, int);
1127 static void ChangeActiveTrap(int, int);
1128
1129 static void InitRobotWheel(int, int);
1130 static void RunRobotWheel(int, int);
1131 static void StopRobotWheel(int, int);
1132
1133 static void InitTimegateWheel(int, int);
1134 static void RunTimegateWheel(int, int);
1135
1136 static void InitMagicBallDelay(int, int);
1137 static void ActivateMagicBall(int, int);
1138
1139 struct ChangingElementInfo
1140 {
1141   int element;
1142   int target_element;
1143   int change_delay;
1144   void (*pre_change_function)(int x, int y);
1145   void (*change_function)(int x, int y);
1146   void (*post_change_function)(int x, int y);
1147 };
1148
1149 static struct ChangingElementInfo change_delay_list[] =
1150 {
1151   {
1152     EL_NUT_BREAKING,
1153     EL_EMERALD,
1154     6,
1155     NULL,
1156     NULL,
1157     NULL
1158   },
1159   {
1160     EL_PEARL_BREAKING,
1161     EL_EMPTY,
1162     8,
1163     NULL,
1164     NULL,
1165     NULL
1166   },
1167   {
1168     EL_EXIT_OPENING,
1169     EL_EXIT_OPEN,
1170     29,
1171     NULL,
1172     NULL,
1173     NULL
1174   },
1175   {
1176     EL_EXIT_CLOSING,
1177     EL_EXIT_CLOSED,
1178     29,
1179     NULL,
1180     NULL,
1181     NULL
1182   },
1183   {
1184     EL_STEEL_EXIT_OPENING,
1185     EL_STEEL_EXIT_OPEN,
1186     29,
1187     NULL,
1188     NULL,
1189     NULL
1190   },
1191   {
1192     EL_STEEL_EXIT_CLOSING,
1193     EL_STEEL_EXIT_CLOSED,
1194     29,
1195     NULL,
1196     NULL,
1197     NULL
1198   },
1199   {
1200     EL_EM_EXIT_OPENING,
1201     EL_EM_EXIT_OPEN,
1202     29,
1203     NULL,
1204     NULL,
1205     NULL
1206   },
1207   {
1208     EL_EM_EXIT_CLOSING,
1209     EL_EMPTY,
1210     29,
1211     NULL,
1212     NULL,
1213     NULL
1214   },
1215   {
1216     EL_EM_STEEL_EXIT_OPENING,
1217     EL_EM_STEEL_EXIT_OPEN,
1218     29,
1219     NULL,
1220     NULL,
1221     NULL
1222   },
1223   {
1224     EL_EM_STEEL_EXIT_CLOSING,
1225     EL_STEELWALL,
1226     29,
1227     NULL,
1228     NULL,
1229     NULL
1230   },
1231   {
1232     EL_SP_EXIT_OPENING,
1233     EL_SP_EXIT_OPEN,
1234     29,
1235     NULL,
1236     NULL,
1237     NULL
1238   },
1239   {
1240     EL_SP_EXIT_CLOSING,
1241     EL_SP_EXIT_CLOSED,
1242     29,
1243     NULL,
1244     NULL,
1245     NULL
1246   },
1247   {
1248     EL_SWITCHGATE_OPENING,
1249     EL_SWITCHGATE_OPEN,
1250     29,
1251     NULL,
1252     NULL,
1253     NULL
1254   },
1255   {
1256     EL_SWITCHGATE_CLOSING,
1257     EL_SWITCHGATE_CLOSED,
1258     29,
1259     NULL,
1260     NULL,
1261     NULL
1262   },
1263   {
1264     EL_TIMEGATE_OPENING,
1265     EL_TIMEGATE_OPEN,
1266     29,
1267     NULL,
1268     NULL,
1269     NULL
1270   },
1271   {
1272     EL_TIMEGATE_CLOSING,
1273     EL_TIMEGATE_CLOSED,
1274     29,
1275     NULL,
1276     NULL,
1277     NULL
1278   },
1279
1280   {
1281     EL_ACID_SPLASH_LEFT,
1282     EL_EMPTY,
1283     8,
1284     NULL,
1285     NULL,
1286     NULL
1287   },
1288   {
1289     EL_ACID_SPLASH_RIGHT,
1290     EL_EMPTY,
1291     8,
1292     NULL,
1293     NULL,
1294     NULL
1295   },
1296   {
1297     EL_SP_BUGGY_BASE,
1298     EL_SP_BUGGY_BASE_ACTIVATING,
1299     0,
1300     InitBuggyBase,
1301     NULL,
1302     NULL
1303   },
1304   {
1305     EL_SP_BUGGY_BASE_ACTIVATING,
1306     EL_SP_BUGGY_BASE_ACTIVE,
1307     0,
1308     InitBuggyBase,
1309     NULL,
1310     NULL
1311   },
1312   {
1313     EL_SP_BUGGY_BASE_ACTIVE,
1314     EL_SP_BUGGY_BASE,
1315     0,
1316     InitBuggyBase,
1317     WarnBuggyBase,
1318     NULL
1319   },
1320   {
1321     EL_TRAP,
1322     EL_TRAP_ACTIVE,
1323     0,
1324     InitTrap,
1325     NULL,
1326     ActivateTrap
1327   },
1328   {
1329     EL_TRAP_ACTIVE,
1330     EL_TRAP,
1331     31,
1332     NULL,
1333     ChangeActiveTrap,
1334     NULL
1335   },
1336   {
1337     EL_ROBOT_WHEEL_ACTIVE,
1338     EL_ROBOT_WHEEL,
1339     0,
1340     InitRobotWheel,
1341     RunRobotWheel,
1342     StopRobotWheel
1343   },
1344   {
1345     EL_TIMEGATE_SWITCH_ACTIVE,
1346     EL_TIMEGATE_SWITCH,
1347     0,
1348     InitTimegateWheel,
1349     RunTimegateWheel,
1350     NULL
1351   },
1352   {
1353     EL_DC_TIMEGATE_SWITCH_ACTIVE,
1354     EL_DC_TIMEGATE_SWITCH,
1355     0,
1356     InitTimegateWheel,
1357     RunTimegateWheel,
1358     NULL
1359   },
1360   {
1361     EL_EMC_MAGIC_BALL_ACTIVE,
1362     EL_EMC_MAGIC_BALL_ACTIVE,
1363     0,
1364     InitMagicBallDelay,
1365     NULL,
1366     ActivateMagicBall
1367   },
1368   {
1369     EL_EMC_SPRING_BUMPER_ACTIVE,
1370     EL_EMC_SPRING_BUMPER,
1371     8,
1372     NULL,
1373     NULL,
1374     NULL
1375   },
1376   {
1377     EL_DIAGONAL_SHRINKING,
1378     EL_UNDEFINED,
1379     0,
1380     NULL,
1381     NULL,
1382     NULL
1383   },
1384   {
1385     EL_DIAGONAL_GROWING,
1386     EL_UNDEFINED,
1387     0,
1388     NULL,
1389     NULL,
1390     NULL,
1391   },
1392
1393   {
1394     EL_UNDEFINED,
1395     EL_UNDEFINED,
1396     -1,
1397     NULL,
1398     NULL,
1399     NULL
1400   }
1401 };
1402
1403 struct
1404 {
1405   int element;
1406   int push_delay_fixed, push_delay_random;
1407 }
1408 push_delay_list[] =
1409 {
1410   { EL_SPRING,                  0, 0 },
1411   { EL_BALLOON,                 0, 0 },
1412
1413   { EL_SOKOBAN_OBJECT,          2, 0 },
1414   { EL_SOKOBAN_FIELD_FULL,      2, 0 },
1415   { EL_SATELLITE,               2, 0 },
1416   { EL_SP_DISK_YELLOW,          2, 0 },
1417
1418   { EL_UNDEFINED,               0, 0 },
1419 };
1420
1421 struct
1422 {
1423   int element;
1424   int move_stepsize;
1425 }
1426 move_stepsize_list[] =
1427 {
1428   { EL_AMOEBA_DROP,             2 },
1429   { EL_AMOEBA_DROPPING,         2 },
1430   { EL_QUICKSAND_FILLING,       1 },
1431   { EL_QUICKSAND_EMPTYING,      1 },
1432   { EL_QUICKSAND_FAST_FILLING,  2 },
1433   { EL_QUICKSAND_FAST_EMPTYING, 2 },
1434   { EL_MAGIC_WALL_FILLING,      2 },
1435   { EL_MAGIC_WALL_EMPTYING,     2 },
1436   { EL_BD_MAGIC_WALL_FILLING,   2 },
1437   { EL_BD_MAGIC_WALL_EMPTYING,  2 },
1438   { EL_DC_MAGIC_WALL_FILLING,   2 },
1439   { EL_DC_MAGIC_WALL_EMPTYING,  2 },
1440
1441   { EL_UNDEFINED,               0 },
1442 };
1443
1444 struct
1445 {
1446   int element;
1447   int count;
1448 }
1449 collect_count_list[] =
1450 {
1451   { EL_EMERALD,                 1 },
1452   { EL_BD_DIAMOND,              1 },
1453   { EL_EMERALD_YELLOW,          1 },
1454   { EL_EMERALD_RED,             1 },
1455   { EL_EMERALD_PURPLE,          1 },
1456   { EL_DIAMOND,                 3 },
1457   { EL_SP_INFOTRON,             1 },
1458   { EL_PEARL,                   5 },
1459   { EL_CRYSTAL,                 8 },
1460
1461   { EL_UNDEFINED,               0 },
1462 };
1463
1464 struct
1465 {
1466   int element;
1467   int direction;
1468 }
1469 access_direction_list[] =
1470 {
1471   { EL_TUBE_ANY,                        MV_LEFT | MV_RIGHT | MV_UP | MV_DOWN },
1472   { EL_TUBE_VERTICAL,                                        MV_UP | MV_DOWN },
1473   { EL_TUBE_HORIZONTAL,                 MV_LEFT | MV_RIGHT                   },
1474   { EL_TUBE_VERTICAL_LEFT,              MV_LEFT |            MV_UP | MV_DOWN },
1475   { EL_TUBE_VERTICAL_RIGHT,                       MV_RIGHT | MV_UP | MV_DOWN },
1476   { EL_TUBE_HORIZONTAL_UP,              MV_LEFT | MV_RIGHT | MV_UP           },
1477   { EL_TUBE_HORIZONTAL_DOWN,            MV_LEFT | MV_RIGHT |         MV_DOWN },
1478   { EL_TUBE_LEFT_UP,                    MV_LEFT |            MV_UP           },
1479   { EL_TUBE_LEFT_DOWN,                  MV_LEFT |                    MV_DOWN },
1480   { EL_TUBE_RIGHT_UP,                             MV_RIGHT | MV_UP           },
1481   { EL_TUBE_RIGHT_DOWN,                           MV_RIGHT |         MV_DOWN },
1482
1483   { EL_SP_PORT_LEFT,                              MV_RIGHT                   },
1484   { EL_SP_PORT_RIGHT,                   MV_LEFT                              },
1485   { EL_SP_PORT_UP,                                                   MV_DOWN },
1486   { EL_SP_PORT_DOWN,                                         MV_UP           },
1487   { EL_SP_PORT_HORIZONTAL,              MV_LEFT | MV_RIGHT                   },
1488   { EL_SP_PORT_VERTICAL,                                     MV_UP | MV_DOWN },
1489   { EL_SP_PORT_ANY,                     MV_LEFT | MV_RIGHT | MV_UP | MV_DOWN },
1490   { EL_SP_GRAVITY_PORT_LEFT,                      MV_RIGHT                   },
1491   { EL_SP_GRAVITY_PORT_RIGHT,           MV_LEFT                              },
1492   { EL_SP_GRAVITY_PORT_UP,                                           MV_DOWN },
1493   { EL_SP_GRAVITY_PORT_DOWN,                                 MV_UP           },
1494   { EL_SP_GRAVITY_ON_PORT_LEFT,                   MV_RIGHT                   },
1495   { EL_SP_GRAVITY_ON_PORT_RIGHT,        MV_LEFT                              },
1496   { EL_SP_GRAVITY_ON_PORT_UP,                                        MV_DOWN },
1497   { EL_SP_GRAVITY_ON_PORT_DOWN,                              MV_UP           },
1498   { EL_SP_GRAVITY_OFF_PORT_LEFT,                  MV_RIGHT                   },
1499   { EL_SP_GRAVITY_OFF_PORT_RIGHT,       MV_LEFT                              },
1500   { EL_SP_GRAVITY_OFF_PORT_UP,                                       MV_DOWN },
1501   { EL_SP_GRAVITY_OFF_PORT_DOWN,                             MV_UP           },
1502
1503   { EL_UNDEFINED,                       MV_NONE                              }
1504 };
1505
1506 static boolean trigger_events[MAX_NUM_ELEMENTS][NUM_CHANGE_EVENTS];
1507
1508 #define IS_AUTO_CHANGING(e)     (element_info[e].has_change_event[CE_DELAY])
1509 #define IS_JUST_CHANGING(x, y)  (ChangeDelay[x][y] != 0)
1510 #define IS_CHANGING(x, y)       (IS_AUTO_CHANGING(Feld[x][y]) || \
1511                                  IS_JUST_CHANGING(x, y))
1512
1513 #define CE_PAGE(e, ce)          (element_info[e].event_page[ce])
1514
1515 /* static variables for playfield scan mode (scanning forward or backward) */
1516 static int playfield_scan_start_x = 0;
1517 static int playfield_scan_start_y = 0;
1518 static int playfield_scan_delta_x = 1;
1519 static int playfield_scan_delta_y = 1;
1520
1521 #define SCAN_PLAYFIELD(x, y)    for ((y) = playfield_scan_start_y;      \
1522                                      (y) >= 0 && (y) <= lev_fieldy - 1; \
1523                                      (y) += playfield_scan_delta_y)     \
1524                                 for ((x) = playfield_scan_start_x;      \
1525                                      (x) >= 0 && (x) <= lev_fieldx - 1; \
1526                                      (x) += playfield_scan_delta_x)
1527
1528 #ifdef DEBUG
1529 void DEBUG_SetMaximumDynamite()
1530 {
1531   int i;
1532
1533   for (i = 0; i < MAX_INVENTORY_SIZE; i++)
1534     if (local_player->inventory_size < MAX_INVENTORY_SIZE)
1535       local_player->inventory_element[local_player->inventory_size++] =
1536         EL_DYNAMITE;
1537 }
1538 #endif
1539
1540 static void InitPlayfieldScanModeVars()
1541 {
1542   if (game.use_reverse_scan_direction)
1543   {
1544     playfield_scan_start_x = lev_fieldx - 1;
1545     playfield_scan_start_y = lev_fieldy - 1;
1546
1547     playfield_scan_delta_x = -1;
1548     playfield_scan_delta_y = -1;
1549   }
1550   else
1551   {
1552     playfield_scan_start_x = 0;
1553     playfield_scan_start_y = 0;
1554
1555     playfield_scan_delta_x = 1;
1556     playfield_scan_delta_y = 1;
1557   }
1558 }
1559
1560 static void InitPlayfieldScanMode(int mode)
1561 {
1562   game.use_reverse_scan_direction =
1563     (mode == CA_ARG_SCAN_MODE_REVERSE ? TRUE : FALSE);
1564
1565   InitPlayfieldScanModeVars();
1566 }
1567
1568 static int get_move_delay_from_stepsize(int move_stepsize)
1569 {
1570   move_stepsize =
1571     MIN(MAX(MOVE_STEPSIZE_MIN, move_stepsize), MOVE_STEPSIZE_MAX);
1572
1573   /* make sure that stepsize value is always a power of 2 */
1574   move_stepsize = (1 << log_2(move_stepsize));
1575
1576   return TILEX / move_stepsize;
1577 }
1578
1579 static void SetPlayerMoveSpeed(struct PlayerInfo *player, int move_stepsize,
1580                                boolean init_game)
1581 {
1582   int player_nr = player->index_nr;
1583   int move_delay = get_move_delay_from_stepsize(move_stepsize);
1584   boolean cannot_move = (move_stepsize == STEPSIZE_NOT_MOVING ? TRUE : FALSE);
1585
1586   /* do no immediately change move delay -- the player might just be moving */
1587   player->move_delay_value_next = move_delay;
1588
1589   /* information if player can move must be set separately */
1590   player->cannot_move = cannot_move;
1591
1592   if (init_game)
1593   {
1594     player->move_delay       = game.initial_move_delay[player_nr];
1595     player->move_delay_value = game.initial_move_delay_value[player_nr];
1596
1597     player->move_delay_value_next = -1;
1598
1599     player->move_delay_reset_counter = 0;
1600   }
1601 }
1602
1603 void GetPlayerConfig()
1604 {
1605   GameFrameDelay = setup.game_frame_delay;
1606
1607   if (!audio.sound_available)
1608     setup.sound_simple = FALSE;
1609
1610   if (!audio.loops_available)
1611     setup.sound_loops = FALSE;
1612
1613   if (!audio.music_available)
1614     setup.sound_music = FALSE;
1615
1616   if (!video.fullscreen_available)
1617     setup.fullscreen = FALSE;
1618
1619   setup.sound = (setup.sound_simple || setup.sound_loops || setup.sound_music);
1620
1621   SetAudioMode(setup.sound);
1622 }
1623
1624 int GetElementFromGroupElement(int element)
1625 {
1626   if (IS_GROUP_ELEMENT(element))
1627   {
1628     struct ElementGroupInfo *group = element_info[element].group;
1629     int last_anim_random_frame = gfx.anim_random_frame;
1630     int element_pos;
1631
1632     if (group->choice_mode == ANIM_RANDOM)
1633       gfx.anim_random_frame = RND(group->num_elements_resolved);
1634
1635     element_pos = getAnimationFrame(group->num_elements_resolved, 1,
1636                                     group->choice_mode, 0,
1637                                     group->choice_pos);
1638
1639     if (group->choice_mode == ANIM_RANDOM)
1640       gfx.anim_random_frame = last_anim_random_frame;
1641
1642     group->choice_pos++;
1643
1644     element = group->element_resolved[element_pos];
1645   }
1646
1647   return element;
1648 }
1649
1650 static void InitPlayerField(int x, int y, int element, boolean init_game)
1651 {
1652   if (element == EL_SP_MURPHY)
1653   {
1654     if (init_game)
1655     {
1656       if (stored_player[0].present)
1657       {
1658         Feld[x][y] = EL_SP_MURPHY_CLONE;
1659
1660         return;
1661       }
1662       else
1663       {
1664         stored_player[0].initial_element = element;
1665         stored_player[0].use_murphy = TRUE;
1666
1667         if (!level.use_artwork_element[0])
1668           stored_player[0].artwork_element = EL_SP_MURPHY;
1669       }
1670
1671       Feld[x][y] = EL_PLAYER_1;
1672     }
1673   }
1674
1675   if (init_game)
1676   {
1677     struct PlayerInfo *player = &stored_player[Feld[x][y] - EL_PLAYER_1];
1678     int jx = player->jx, jy = player->jy;
1679
1680     player->present = TRUE;
1681
1682     player->block_last_field = (element == EL_SP_MURPHY ?
1683                                 level.sp_block_last_field :
1684                                 level.block_last_field);
1685
1686     /* ---------- initialize player's last field block delay --------------- */
1687
1688     /* always start with reliable default value (no adjustment needed) */
1689     player->block_delay_adjustment = 0;
1690
1691     /* special case 1: in Supaplex, Murphy blocks last field one more frame */
1692     if (player->block_last_field && element == EL_SP_MURPHY)
1693       player->block_delay_adjustment = 1;
1694
1695     /* special case 2: in game engines before 3.1.1, blocking was different */
1696     if (game.use_block_last_field_bug)
1697       player->block_delay_adjustment = (player->block_last_field ? -1 : 1);
1698
1699     if (!options.network || player->connected)
1700     {
1701       player->active = TRUE;
1702
1703       /* remove potentially duplicate players */
1704       if (StorePlayer[jx][jy] == Feld[x][y])
1705         StorePlayer[jx][jy] = 0;
1706
1707       StorePlayer[x][y] = Feld[x][y];
1708
1709 #if DEBUG_INIT_PLAYER
1710       if (options.debug)
1711       {
1712         printf("- player element %d activated", player->element_nr);
1713         printf(" (local player is %d and currently %s)\n",
1714                local_player->element_nr,
1715                local_player->active ? "active" : "not active");
1716       }
1717     }
1718 #endif
1719
1720     Feld[x][y] = EL_EMPTY;
1721
1722     player->jx = player->last_jx = x;
1723     player->jy = player->last_jy = y;
1724   }
1725
1726   if (!init_game)
1727   {
1728     int player_nr = GET_PLAYER_NR(element);
1729     struct PlayerInfo *player = &stored_player[player_nr];
1730
1731     if (player->active && player->killed)
1732       player->reanimated = TRUE; /* if player was just killed, reanimate him */
1733   }
1734 }
1735
1736 static void InitField(int x, int y, boolean init_game)
1737 {
1738   int element = Feld[x][y];
1739
1740   switch (element)
1741   {
1742     case EL_SP_MURPHY:
1743     case EL_PLAYER_1:
1744     case EL_PLAYER_2:
1745     case EL_PLAYER_3:
1746     case EL_PLAYER_4:
1747       InitPlayerField(x, y, element, init_game);
1748       break;
1749
1750     case EL_SOKOBAN_FIELD_PLAYER:
1751       element = Feld[x][y] = EL_PLAYER_1;
1752       InitField(x, y, init_game);
1753
1754       element = Feld[x][y] = EL_SOKOBAN_FIELD_EMPTY;
1755       InitField(x, y, init_game);
1756       break;
1757
1758     case EL_SOKOBAN_FIELD_EMPTY:
1759       local_player->sokobanfields_still_needed++;
1760       break;
1761
1762     case EL_STONEBLOCK:
1763       if (x < lev_fieldx-1 && Feld[x+1][y] == EL_ACID)
1764         Feld[x][y] = EL_ACID_POOL_TOPLEFT;
1765       else if (x > 0 && Feld[x-1][y] == EL_ACID)
1766         Feld[x][y] = EL_ACID_POOL_TOPRIGHT;
1767       else if (y > 0 && Feld[x][y-1] == EL_ACID_POOL_TOPLEFT)
1768         Feld[x][y] = EL_ACID_POOL_BOTTOMLEFT;
1769       else if (y > 0 && Feld[x][y-1] == EL_ACID)
1770         Feld[x][y] = EL_ACID_POOL_BOTTOM;
1771       else if (y > 0 && Feld[x][y-1] == EL_ACID_POOL_TOPRIGHT)
1772         Feld[x][y] = EL_ACID_POOL_BOTTOMRIGHT;
1773       break;
1774
1775     case EL_BUG:
1776     case EL_BUG_RIGHT:
1777     case EL_BUG_UP:
1778     case EL_BUG_LEFT:
1779     case EL_BUG_DOWN:
1780     case EL_SPACESHIP:
1781     case EL_SPACESHIP_RIGHT:
1782     case EL_SPACESHIP_UP:
1783     case EL_SPACESHIP_LEFT:
1784     case EL_SPACESHIP_DOWN:
1785     case EL_BD_BUTTERFLY:
1786     case EL_BD_BUTTERFLY_RIGHT:
1787     case EL_BD_BUTTERFLY_UP:
1788     case EL_BD_BUTTERFLY_LEFT:
1789     case EL_BD_BUTTERFLY_DOWN:
1790     case EL_BD_FIREFLY:
1791     case EL_BD_FIREFLY_RIGHT:
1792     case EL_BD_FIREFLY_UP:
1793     case EL_BD_FIREFLY_LEFT:
1794     case EL_BD_FIREFLY_DOWN:
1795     case EL_PACMAN_RIGHT:
1796     case EL_PACMAN_UP:
1797     case EL_PACMAN_LEFT:
1798     case EL_PACMAN_DOWN:
1799     case EL_YAMYAM:
1800     case EL_YAMYAM_LEFT:
1801     case EL_YAMYAM_RIGHT:
1802     case EL_YAMYAM_UP:
1803     case EL_YAMYAM_DOWN:
1804     case EL_DARK_YAMYAM:
1805     case EL_ROBOT:
1806     case EL_PACMAN:
1807     case EL_SP_SNIKSNAK:
1808     case EL_SP_ELECTRON:
1809     case EL_MOLE:
1810     case EL_MOLE_LEFT:
1811     case EL_MOLE_RIGHT:
1812     case EL_MOLE_UP:
1813     case EL_MOLE_DOWN:
1814       InitMovDir(x, y);
1815       break;
1816
1817     case EL_AMOEBA_FULL:
1818     case EL_BD_AMOEBA:
1819       InitAmoebaNr(x, y);
1820       break;
1821
1822     case EL_AMOEBA_DROP:
1823       if (y == lev_fieldy - 1)
1824       {
1825         Feld[x][y] = EL_AMOEBA_GROWING;
1826         Store[x][y] = EL_AMOEBA_WET;
1827       }
1828       break;
1829
1830     case EL_DYNAMITE_ACTIVE:
1831     case EL_SP_DISK_RED_ACTIVE:
1832     case EL_DYNABOMB_PLAYER_1_ACTIVE:
1833     case EL_DYNABOMB_PLAYER_2_ACTIVE:
1834     case EL_DYNABOMB_PLAYER_3_ACTIVE:
1835     case EL_DYNABOMB_PLAYER_4_ACTIVE:
1836       MovDelay[x][y] = 96;
1837       break;
1838
1839     case EL_EM_DYNAMITE_ACTIVE:
1840       MovDelay[x][y] = 32;
1841       break;
1842
1843     case EL_LAMP:
1844       local_player->lights_still_needed++;
1845       break;
1846
1847     case EL_PENGUIN:
1848       local_player->friends_still_needed++;
1849       break;
1850
1851     case EL_PIG:
1852     case EL_DRAGON:
1853       GfxDir[x][y] = MovDir[x][y] = 1 << RND(4);
1854       break;
1855
1856     case EL_CONVEYOR_BELT_1_SWITCH_LEFT:
1857     case EL_CONVEYOR_BELT_1_SWITCH_MIDDLE:
1858     case EL_CONVEYOR_BELT_1_SWITCH_RIGHT:
1859     case EL_CONVEYOR_BELT_2_SWITCH_LEFT:
1860     case EL_CONVEYOR_BELT_2_SWITCH_MIDDLE:
1861     case EL_CONVEYOR_BELT_2_SWITCH_RIGHT:
1862     case EL_CONVEYOR_BELT_3_SWITCH_LEFT:
1863     case EL_CONVEYOR_BELT_3_SWITCH_MIDDLE:
1864     case EL_CONVEYOR_BELT_3_SWITCH_RIGHT:
1865     case EL_CONVEYOR_BELT_4_SWITCH_LEFT:
1866     case EL_CONVEYOR_BELT_4_SWITCH_MIDDLE:
1867     case EL_CONVEYOR_BELT_4_SWITCH_RIGHT:
1868       if (init_game)
1869       {
1870         int belt_nr = getBeltNrFromBeltSwitchElement(Feld[x][y]);
1871         int belt_dir = getBeltDirFromBeltSwitchElement(Feld[x][y]);
1872         int belt_dir_nr = getBeltDirNrFromBeltSwitchElement(Feld[x][y]);
1873
1874         if (game.belt_dir_nr[belt_nr] == 3)     /* initial value */
1875         {
1876           game.belt_dir[belt_nr] = belt_dir;
1877           game.belt_dir_nr[belt_nr] = belt_dir_nr;
1878         }
1879         else    /* more than one switch -- set it like the first switch */
1880         {
1881           Feld[x][y] = Feld[x][y] - belt_dir_nr + game.belt_dir_nr[belt_nr];
1882         }
1883       }
1884       break;
1885
1886     case EL_LIGHT_SWITCH_ACTIVE:
1887       if (init_game)
1888         game.light_time_left = level.time_light * FRAMES_PER_SECOND;
1889       break;
1890
1891     case EL_INVISIBLE_STEELWALL:
1892     case EL_INVISIBLE_WALL:
1893     case EL_INVISIBLE_SAND:
1894       if (game.light_time_left > 0 ||
1895           game.lenses_time_left > 0)
1896         Feld[x][y] = getInvisibleActiveFromInvisibleElement(element);
1897       break;
1898
1899     case EL_EMC_MAGIC_BALL:
1900       if (game.ball_state)
1901         Feld[x][y] = EL_EMC_MAGIC_BALL_ACTIVE;
1902       break;
1903
1904     case EL_EMC_MAGIC_BALL_SWITCH:
1905       if (game.ball_state)
1906         Feld[x][y] = EL_EMC_MAGIC_BALL_SWITCH_ACTIVE;
1907       break;
1908
1909     case EL_TRIGGER_PLAYER:
1910     case EL_TRIGGER_ELEMENT:
1911     case EL_TRIGGER_CE_VALUE:
1912     case EL_TRIGGER_CE_SCORE:
1913     case EL_SELF:
1914     case EL_ANY_ELEMENT:
1915     case EL_CURRENT_CE_VALUE:
1916     case EL_CURRENT_CE_SCORE:
1917     case EL_PREV_CE_1:
1918     case EL_PREV_CE_2:
1919     case EL_PREV_CE_3:
1920     case EL_PREV_CE_4:
1921     case EL_PREV_CE_5:
1922     case EL_PREV_CE_6:
1923     case EL_PREV_CE_7:
1924     case EL_PREV_CE_8:
1925     case EL_NEXT_CE_1:
1926     case EL_NEXT_CE_2:
1927     case EL_NEXT_CE_3:
1928     case EL_NEXT_CE_4:
1929     case EL_NEXT_CE_5:
1930     case EL_NEXT_CE_6:
1931     case EL_NEXT_CE_7:
1932     case EL_NEXT_CE_8:
1933       /* reference elements should not be used on the playfield */
1934       Feld[x][y] = EL_EMPTY;
1935       break;
1936
1937     default:
1938       if (IS_CUSTOM_ELEMENT(element))
1939       {
1940         if (CAN_MOVE(element))
1941           InitMovDir(x, y);
1942
1943         if (!element_info[element].use_last_ce_value || init_game)
1944           CustomValue[x][y] = GET_NEW_CE_VALUE(Feld[x][y]);
1945       }
1946       else if (IS_GROUP_ELEMENT(element))
1947       {
1948         Feld[x][y] = GetElementFromGroupElement(element);
1949
1950         InitField(x, y, init_game);
1951       }
1952
1953       break;
1954   }
1955
1956   if (!init_game)
1957     CheckTriggeredElementChange(x, y, element, CE_CREATION_OF_X);
1958 }
1959
1960 inline static void InitField_WithBug1(int x, int y, boolean init_game)
1961 {
1962   InitField(x, y, init_game);
1963
1964   /* not needed to call InitMovDir() -- already done by InitField()! */
1965   if (game.engine_version < VERSION_IDENT(3,1,0,0) &&
1966       CAN_MOVE(Feld[x][y]))
1967     InitMovDir(x, y);
1968 }
1969
1970 inline static void InitField_WithBug2(int x, int y, boolean init_game)
1971 {
1972   int old_element = Feld[x][y];
1973
1974   InitField(x, y, init_game);
1975
1976   /* not needed to call InitMovDir() -- already done by InitField()! */
1977   if (game.engine_version < VERSION_IDENT(3,1,0,0) &&
1978       CAN_MOVE(old_element) &&
1979       (old_element < EL_MOLE_LEFT || old_element > EL_MOLE_DOWN))
1980     InitMovDir(x, y);
1981
1982   /* this case is in fact a combination of not less than three bugs:
1983      first, it calls InitMovDir() for elements that can move, although this is
1984      already done by InitField(); then, it checks the element that was at this
1985      field _before_ the call to InitField() (which can change it); lastly, it
1986      was not called for "mole with direction" elements, which were treated as
1987      "cannot move" due to (fixed) wrong element initialization in "src/init.c"
1988   */
1989 }
1990
1991 static int get_key_element_from_nr(int key_nr)
1992 {
1993   int key_base_element = (key_nr >= STD_NUM_KEYS ? EL_EMC_KEY_5 - STD_NUM_KEYS :
1994                           level.game_engine_type == GAME_ENGINE_TYPE_EM ?
1995                           EL_EM_KEY_1 : EL_KEY_1);
1996
1997   return key_base_element + key_nr;
1998 }
1999
2000 static int get_next_dropped_element(struct PlayerInfo *player)
2001 {
2002   return (player->inventory_size > 0 ?
2003           player->inventory_element[player->inventory_size - 1] :
2004           player->inventory_infinite_element != EL_UNDEFINED ?
2005           player->inventory_infinite_element :
2006           player->dynabombs_left > 0 ?
2007           EL_DYNABOMB_PLAYER_1_ACTIVE + player->index_nr :
2008           EL_UNDEFINED);
2009 }
2010
2011 static int get_inventory_element_from_pos(struct PlayerInfo *player, int pos)
2012 {
2013   /* pos >= 0: get element from bottom of the stack;
2014      pos <  0: get element from top of the stack */
2015
2016   if (pos < 0)
2017   {
2018     int min_inventory_size = -pos;
2019     int inventory_pos = player->inventory_size - min_inventory_size;
2020     int min_dynabombs_left = min_inventory_size - player->inventory_size;
2021
2022     return (player->inventory_size >= min_inventory_size ?
2023             player->inventory_element[inventory_pos] :
2024             player->inventory_infinite_element != EL_UNDEFINED ?
2025             player->inventory_infinite_element :
2026             player->dynabombs_left >= min_dynabombs_left ?
2027             EL_DYNABOMB_PLAYER_1 + player->index_nr :
2028             EL_UNDEFINED);
2029   }
2030   else
2031   {
2032     int min_dynabombs_left = pos + 1;
2033     int min_inventory_size = pos + 1 - player->dynabombs_left;
2034     int inventory_pos = pos - player->dynabombs_left;
2035
2036     return (player->inventory_infinite_element != EL_UNDEFINED ?
2037             player->inventory_infinite_element :
2038             player->dynabombs_left >= min_dynabombs_left ?
2039             EL_DYNABOMB_PLAYER_1 + player->index_nr :
2040             player->inventory_size >= min_inventory_size ?
2041             player->inventory_element[inventory_pos] :
2042             EL_UNDEFINED);
2043   }
2044 }
2045
2046 static int compareGamePanelOrderInfo(const void *object1, const void *object2)
2047 {
2048   const struct GamePanelOrderInfo *gpo1 = (struct GamePanelOrderInfo *)object1;
2049   const struct GamePanelOrderInfo *gpo2 = (struct GamePanelOrderInfo *)object2;
2050   int compare_result;
2051
2052   if (gpo1->sort_priority != gpo2->sort_priority)
2053     compare_result = gpo1->sort_priority - gpo2->sort_priority;
2054   else
2055     compare_result = gpo1->nr - gpo2->nr;
2056
2057   return compare_result;
2058 }
2059
2060 int getPlayerInventorySize(int player_nr)
2061 {
2062   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
2063     return level.native_em_level->ply[player_nr]->dynamite;
2064   else if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
2065     return level.native_sp_level->game_sp->red_disk_count;
2066   else
2067     return stored_player[player_nr].inventory_size;
2068 }
2069
2070 void InitGameControlValues()
2071 {
2072   int i;
2073
2074   for (i = 0; game_panel_controls[i].nr != -1; i++)
2075   {
2076     struct GamePanelControlInfo *gpc = &game_panel_controls[i];
2077     struct GamePanelOrderInfo *gpo = &game_panel_order[i];
2078     struct TextPosInfo *pos = gpc->pos;
2079     int nr = gpc->nr;
2080     int type = gpc->type;
2081
2082     if (nr != i)
2083     {
2084       Error(ERR_INFO, "'game_panel_controls' structure corrupted at %d", i);
2085       Error(ERR_EXIT, "this should not happen -- please debug");
2086     }
2087
2088     /* force update of game controls after initialization */
2089     gpc->value = gpc->last_value = -1;
2090     gpc->frame = gpc->last_frame = -1;
2091     gpc->gfx_frame = -1;
2092
2093     /* determine panel value width for later calculation of alignment */
2094     if (type == TYPE_INTEGER || type == TYPE_STRING)
2095     {
2096       pos->width = pos->size * getFontWidth(pos->font);
2097       pos->height = getFontHeight(pos->font);
2098     }
2099     else if (type == TYPE_ELEMENT)
2100     {
2101       pos->width = pos->size;
2102       pos->height = pos->size;
2103     }
2104
2105     /* fill structure for game panel draw order */
2106     gpo->nr = gpc->nr;
2107     gpo->sort_priority = pos->sort_priority;
2108   }
2109
2110   /* sort game panel controls according to sort_priority and control number */
2111   qsort(game_panel_order, NUM_GAME_PANEL_CONTROLS,
2112         sizeof(struct GamePanelOrderInfo), compareGamePanelOrderInfo);
2113 }
2114
2115 void UpdatePlayfieldElementCount()
2116 {
2117   boolean use_element_count = FALSE;
2118   int i, j, x, y;
2119
2120   /* first check if it is needed at all to calculate playfield element count */
2121   for (i = GAME_PANEL_ELEMENT_COUNT_1; i <= GAME_PANEL_ELEMENT_COUNT_8; i++)
2122     if (!PANEL_DEACTIVATED(game_panel_controls[i].pos))
2123       use_element_count = TRUE;
2124
2125   if (!use_element_count)
2126     return;
2127
2128   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
2129     element_info[i].element_count = 0;
2130
2131   SCAN_PLAYFIELD(x, y)
2132   {
2133     element_info[Feld[x][y]].element_count++;
2134   }
2135
2136   for (i = 0; i < NUM_GROUP_ELEMENTS; i++)
2137     for (j = 0; j < MAX_NUM_ELEMENTS; j++)
2138       if (IS_IN_GROUP(j, i))
2139         element_info[EL_GROUP_START + i].element_count +=
2140           element_info[j].element_count;
2141 }
2142
2143 void UpdateGameControlValues()
2144 {
2145   int i, k;
2146   int time = (local_player->LevelSolved ?
2147               local_player->LevelSolved_CountingTime :
2148               level.game_engine_type == GAME_ENGINE_TYPE_EM ?
2149               level.native_em_level->lev->time :
2150               level.game_engine_type == GAME_ENGINE_TYPE_SP ?
2151               level.native_sp_level->game_sp->time_played :
2152               game.no_time_limit ? TimePlayed : TimeLeft);
2153   int score = (local_player->LevelSolved ?
2154                local_player->LevelSolved_CountingScore :
2155                level.game_engine_type == GAME_ENGINE_TYPE_EM ?
2156                level.native_em_level->lev->score :
2157                level.game_engine_type == GAME_ENGINE_TYPE_SP ?
2158                level.native_sp_level->game_sp->score :
2159                local_player->score);
2160   int gems = (level.game_engine_type == GAME_ENGINE_TYPE_EM ?
2161               level.native_em_level->lev->required :
2162               level.game_engine_type == GAME_ENGINE_TYPE_SP ?
2163               level.native_sp_level->game_sp->infotrons_still_needed :
2164               local_player->gems_still_needed);
2165   int exit_closed = (level.game_engine_type == GAME_ENGINE_TYPE_EM ?
2166                      level.native_em_level->lev->required > 0 :
2167                      level.game_engine_type == GAME_ENGINE_TYPE_SP ?
2168                      level.native_sp_level->game_sp->infotrons_still_needed > 0 :
2169                      local_player->gems_still_needed > 0 ||
2170                      local_player->sokobanfields_still_needed > 0 ||
2171                      local_player->lights_still_needed > 0);
2172
2173   UpdatePlayfieldElementCount();
2174
2175   /* update game panel control values */
2176
2177   game_panel_controls[GAME_PANEL_LEVEL_NUMBER].value = level_nr;
2178   game_panel_controls[GAME_PANEL_GEMS].value = gems;
2179
2180   game_panel_controls[GAME_PANEL_INVENTORY_COUNT].value = 0;
2181   for (i = 0; i < MAX_NUM_KEYS; i++)
2182     game_panel_controls[GAME_PANEL_KEY_1 + i].value = EL_EMPTY;
2183   game_panel_controls[GAME_PANEL_KEY_WHITE].value = EL_EMPTY;
2184   game_panel_controls[GAME_PANEL_KEY_WHITE_COUNT].value = 0;
2185
2186   if (game.centered_player_nr == -1)
2187   {
2188     for (i = 0; i < MAX_PLAYERS; i++)
2189     {
2190       /* only one player in Supaplex game engine */
2191       if (level.game_engine_type == GAME_ENGINE_TYPE_SP && i > 0)
2192         break;
2193
2194       for (k = 0; k < MAX_NUM_KEYS; k++)
2195       {
2196         if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
2197         {
2198           if (level.native_em_level->ply[i]->keys & (1 << k))
2199             game_panel_controls[GAME_PANEL_KEY_1 + k].value =
2200               get_key_element_from_nr(k);
2201         }
2202         else if (stored_player[i].key[k])
2203           game_panel_controls[GAME_PANEL_KEY_1 + k].value =
2204             get_key_element_from_nr(k);
2205       }
2206
2207       game_panel_controls[GAME_PANEL_INVENTORY_COUNT].value +=
2208         getPlayerInventorySize(i);
2209
2210       if (stored_player[i].num_white_keys > 0)
2211         game_panel_controls[GAME_PANEL_KEY_WHITE].value =
2212           EL_DC_KEY_WHITE;
2213
2214       game_panel_controls[GAME_PANEL_KEY_WHITE_COUNT].value +=
2215         stored_player[i].num_white_keys;
2216     }
2217   }
2218   else
2219   {
2220     int player_nr = game.centered_player_nr;
2221
2222     for (k = 0; k < MAX_NUM_KEYS; k++)
2223     {
2224       if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
2225       {
2226         if (level.native_em_level->ply[player_nr]->keys & (1 << k))
2227           game_panel_controls[GAME_PANEL_KEY_1 + k].value =
2228             get_key_element_from_nr(k);
2229       }
2230       else if (stored_player[player_nr].key[k])
2231         game_panel_controls[GAME_PANEL_KEY_1 + k].value =
2232           get_key_element_from_nr(k);
2233     }
2234
2235     game_panel_controls[GAME_PANEL_INVENTORY_COUNT].value +=
2236       getPlayerInventorySize(player_nr);
2237
2238     if (stored_player[player_nr].num_white_keys > 0)
2239       game_panel_controls[GAME_PANEL_KEY_WHITE].value = EL_DC_KEY_WHITE;
2240
2241     game_panel_controls[GAME_PANEL_KEY_WHITE_COUNT].value +=
2242       stored_player[player_nr].num_white_keys;
2243   }
2244
2245   for (i = 0; i < NUM_PANEL_INVENTORY; i++)
2246   {
2247     game_panel_controls[GAME_PANEL_INVENTORY_FIRST_1 + i].value =
2248       get_inventory_element_from_pos(local_player, i);
2249     game_panel_controls[GAME_PANEL_INVENTORY_LAST_1 + i].value =
2250       get_inventory_element_from_pos(local_player, -i - 1);
2251   }
2252
2253   game_panel_controls[GAME_PANEL_SCORE].value = score;
2254   game_panel_controls[GAME_PANEL_HIGHSCORE].value = highscore[0].Score;
2255
2256   game_panel_controls[GAME_PANEL_TIME].value = time;
2257
2258   game_panel_controls[GAME_PANEL_TIME_HH].value = time / 3600;
2259   game_panel_controls[GAME_PANEL_TIME_MM].value = (time / 60) % 60;
2260   game_panel_controls[GAME_PANEL_TIME_SS].value = time % 60;
2261
2262   game_panel_controls[GAME_PANEL_FRAME].value = FrameCounter;
2263
2264   game_panel_controls[GAME_PANEL_SHIELD_NORMAL].value =
2265     (local_player->shield_normal_time_left > 0 ? EL_SHIELD_NORMAL_ACTIVE :
2266      EL_EMPTY);
2267   game_panel_controls[GAME_PANEL_SHIELD_NORMAL_TIME].value =
2268     local_player->shield_normal_time_left;
2269   game_panel_controls[GAME_PANEL_SHIELD_DEADLY].value =
2270     (local_player->shield_deadly_time_left > 0 ? EL_SHIELD_DEADLY_ACTIVE :
2271      EL_EMPTY);
2272   game_panel_controls[GAME_PANEL_SHIELD_DEADLY_TIME].value =
2273     local_player->shield_deadly_time_left;
2274
2275   game_panel_controls[GAME_PANEL_EXIT].value =
2276     (exit_closed ? EL_EXIT_CLOSED : EL_EXIT_OPEN);
2277
2278   game_panel_controls[GAME_PANEL_EMC_MAGIC_BALL].value =
2279     (game.ball_state ? EL_EMC_MAGIC_BALL_ACTIVE : EL_EMC_MAGIC_BALL);
2280   game_panel_controls[GAME_PANEL_EMC_MAGIC_BALL_SWITCH].value =
2281     (game.ball_state ? EL_EMC_MAGIC_BALL_SWITCH_ACTIVE :
2282      EL_EMC_MAGIC_BALL_SWITCH);
2283
2284   game_panel_controls[GAME_PANEL_LIGHT_SWITCH].value =
2285     (game.light_time_left > 0 ? EL_LIGHT_SWITCH_ACTIVE : EL_LIGHT_SWITCH);
2286   game_panel_controls[GAME_PANEL_LIGHT_SWITCH_TIME].value =
2287     game.light_time_left;
2288
2289   game_panel_controls[GAME_PANEL_TIMEGATE_SWITCH].value =
2290     (game.timegate_time_left > 0 ? EL_TIMEGATE_OPEN : EL_TIMEGATE_CLOSED);
2291   game_panel_controls[GAME_PANEL_TIMEGATE_SWITCH_TIME].value =
2292     game.timegate_time_left;
2293
2294   game_panel_controls[GAME_PANEL_SWITCHGATE_SWITCH].value =
2295     EL_SWITCHGATE_SWITCH_UP + game.switchgate_pos;
2296
2297   game_panel_controls[GAME_PANEL_EMC_LENSES].value =
2298     (game.lenses_time_left > 0 ? EL_EMC_LENSES : EL_EMPTY);
2299   game_panel_controls[GAME_PANEL_EMC_LENSES_TIME].value =
2300     game.lenses_time_left;
2301
2302   game_panel_controls[GAME_PANEL_EMC_MAGNIFIER].value =
2303     (game.magnify_time_left > 0 ? EL_EMC_MAGNIFIER : EL_EMPTY);
2304   game_panel_controls[GAME_PANEL_EMC_MAGNIFIER_TIME].value =
2305     game.magnify_time_left;
2306
2307   game_panel_controls[GAME_PANEL_BALLOON_SWITCH].value =
2308     (game.wind_direction == MV_LEFT  ? EL_BALLOON_SWITCH_LEFT  :
2309      game.wind_direction == MV_RIGHT ? EL_BALLOON_SWITCH_RIGHT :
2310      game.wind_direction == MV_UP    ? EL_BALLOON_SWITCH_UP    :
2311      game.wind_direction == MV_DOWN  ? EL_BALLOON_SWITCH_DOWN  :
2312      EL_BALLOON_SWITCH_NONE);
2313
2314   game_panel_controls[GAME_PANEL_DYNABOMB_NUMBER].value =
2315     local_player->dynabomb_count;
2316   game_panel_controls[GAME_PANEL_DYNABOMB_SIZE].value =
2317     local_player->dynabomb_size;
2318   game_panel_controls[GAME_PANEL_DYNABOMB_POWER].value =
2319     (local_player->dynabomb_xl ? EL_DYNABOMB_INCREASE_POWER : EL_EMPTY);
2320
2321   game_panel_controls[GAME_PANEL_PENGUINS].value =
2322     local_player->friends_still_needed;
2323
2324   game_panel_controls[GAME_PANEL_SOKOBAN_OBJECTS].value =
2325     local_player->sokobanfields_still_needed;
2326   game_panel_controls[GAME_PANEL_SOKOBAN_FIELDS].value =
2327     local_player->sokobanfields_still_needed;
2328
2329   game_panel_controls[GAME_PANEL_ROBOT_WHEEL].value =
2330     (game.robot_wheel_active ? EL_ROBOT_WHEEL_ACTIVE : EL_ROBOT_WHEEL);
2331
2332   for (i = 0; i < NUM_BELTS; i++)
2333   {
2334     game_panel_controls[GAME_PANEL_CONVEYOR_BELT_1 + i].value =
2335       (game.belt_dir[i] != MV_NONE ? EL_CONVEYOR_BELT_1_MIDDLE_ACTIVE :
2336        EL_CONVEYOR_BELT_1_MIDDLE) + i;
2337     game_panel_controls[GAME_PANEL_CONVEYOR_BELT_1_SWITCH + i].value =
2338       getBeltSwitchElementFromBeltNrAndBeltDir(i, game.belt_dir[i]);
2339   }
2340
2341   game_panel_controls[GAME_PANEL_MAGIC_WALL].value =
2342     (game.magic_wall_active ? EL_MAGIC_WALL_ACTIVE : EL_MAGIC_WALL);
2343   game_panel_controls[GAME_PANEL_MAGIC_WALL_TIME].value =
2344     game.magic_wall_time_left;
2345
2346   game_panel_controls[GAME_PANEL_GRAVITY_STATE].value =
2347     local_player->gravity;
2348
2349   for (i = 0; i < NUM_PANEL_GRAPHICS; i++)
2350     game_panel_controls[GAME_PANEL_GRAPHIC_1 + i].value = EL_GRAPHIC_1 + i;
2351
2352   for (i = 0; i < NUM_PANEL_ELEMENTS; i++)
2353     game_panel_controls[GAME_PANEL_ELEMENT_1 + i].value =
2354       (IS_DRAWABLE_ELEMENT(game.panel.element[i].id) ?
2355        game.panel.element[i].id : EL_UNDEFINED);
2356
2357   for (i = 0; i < NUM_PANEL_ELEMENTS; i++)
2358     game_panel_controls[GAME_PANEL_ELEMENT_COUNT_1 + i].value =
2359       (IS_VALID_ELEMENT(game.panel.element_count[i].id) ?
2360        element_info[game.panel.element_count[i].id].element_count : 0);
2361
2362   for (i = 0; i < NUM_PANEL_CE_SCORE; i++)
2363     game_panel_controls[GAME_PANEL_CE_SCORE_1 + i].value =
2364       (IS_CUSTOM_ELEMENT(game.panel.ce_score[i].id) ?
2365        element_info[game.panel.ce_score[i].id].collect_score : 0);
2366
2367   for (i = 0; i < NUM_PANEL_CE_SCORE; i++)
2368     game_panel_controls[GAME_PANEL_CE_SCORE_1_ELEMENT + i].value =
2369       (IS_CUSTOM_ELEMENT(game.panel.ce_score_element[i].id) ?
2370        element_info[game.panel.ce_score_element[i].id].collect_score :
2371        EL_UNDEFINED);
2372
2373   game_panel_controls[GAME_PANEL_PLAYER_NAME].value = 0;
2374   game_panel_controls[GAME_PANEL_LEVEL_NAME].value = 0;
2375   game_panel_controls[GAME_PANEL_LEVEL_AUTHOR].value = 0;
2376
2377   /* update game panel control frames */
2378
2379   for (i = 0; game_panel_controls[i].nr != -1; i++)
2380   {
2381     struct GamePanelControlInfo *gpc = &game_panel_controls[i];
2382
2383     if (gpc->type == TYPE_ELEMENT)
2384     {
2385       if (gpc->value != EL_UNDEFINED && gpc->value != EL_EMPTY)
2386       {
2387         int last_anim_random_frame = gfx.anim_random_frame;
2388         int element = gpc->value;
2389         int graphic = el2panelimg(element);
2390
2391         if (gpc->value != gpc->last_value)
2392         {
2393           gpc->gfx_frame = 0;
2394           gpc->gfx_random = INIT_GFX_RANDOM();
2395         }
2396         else
2397         {
2398           gpc->gfx_frame++;
2399
2400           if (ANIM_MODE(graphic) == ANIM_RANDOM &&
2401               IS_NEXT_FRAME(gpc->gfx_frame, graphic))
2402             gpc->gfx_random = INIT_GFX_RANDOM();
2403         }
2404
2405         if (ANIM_MODE(graphic) == ANIM_RANDOM)
2406           gfx.anim_random_frame = gpc->gfx_random;
2407
2408         if (ANIM_MODE(graphic) == ANIM_CE_SCORE)
2409           gpc->gfx_frame = element_info[element].collect_score;
2410
2411         gpc->frame = getGraphicAnimationFrame(el2panelimg(gpc->value),
2412                                               gpc->gfx_frame);
2413
2414         if (ANIM_MODE(graphic) == ANIM_RANDOM)
2415           gfx.anim_random_frame = last_anim_random_frame;
2416       }
2417     }
2418   }
2419 }
2420
2421 void DisplayGameControlValues()
2422 {
2423   boolean redraw_panel = FALSE;
2424   int i;
2425
2426   for (i = 0; game_panel_controls[i].nr != -1; i++)
2427   {
2428     struct GamePanelControlInfo *gpc = &game_panel_controls[i];
2429
2430     if (PANEL_DEACTIVATED(gpc->pos))
2431       continue;
2432
2433     if (gpc->value == gpc->last_value &&
2434         gpc->frame == gpc->last_frame)
2435       continue;
2436
2437     redraw_panel = TRUE;
2438   }
2439
2440   if (!redraw_panel)
2441     return;
2442
2443   /* copy default game door content to main double buffer */
2444
2445   /* !!! CHECK AGAIN !!! */
2446   SetPanelBackground();
2447   // SetDoorBackgroundImage(IMG_BACKGROUND_PANEL);
2448   DrawBackground(DX, DY, DXSIZE, DYSIZE);
2449
2450   /* redraw game control buttons */
2451   RedrawGameButtons();
2452
2453   SetGameStatus(GAME_MODE_PSEUDO_PANEL);
2454
2455   for (i = 0; i < NUM_GAME_PANEL_CONTROLS; i++)
2456   {
2457     int nr = game_panel_order[i].nr;
2458     struct GamePanelControlInfo *gpc = &game_panel_controls[nr];
2459     struct TextPosInfo *pos = gpc->pos;
2460     int type = gpc->type;
2461     int value = gpc->value;
2462     int frame = gpc->frame;
2463     int size = pos->size;
2464     int font = pos->font;
2465     boolean draw_masked = pos->draw_masked;
2466     int mask_mode = (draw_masked ? BLIT_MASKED : BLIT_OPAQUE);
2467
2468     if (PANEL_DEACTIVATED(pos))
2469       continue;
2470
2471     gpc->last_value = value;
2472     gpc->last_frame = frame;
2473
2474     if (type == TYPE_INTEGER)
2475     {
2476       if (nr == GAME_PANEL_LEVEL_NUMBER ||
2477           nr == GAME_PANEL_TIME)
2478       {
2479         boolean use_dynamic_size = (size == -1 ? TRUE : FALSE);
2480
2481         if (use_dynamic_size)           /* use dynamic number of digits */
2482         {
2483           int value_change = (nr == GAME_PANEL_LEVEL_NUMBER ? 100 : 1000);
2484           int size1 = (nr == GAME_PANEL_LEVEL_NUMBER ? 2 : 3);
2485           int size2 = size1 + 1;
2486           int font1 = pos->font;
2487           int font2 = pos->font_alt;
2488
2489           size = (value < value_change ? size1 : size2);
2490           font = (value < value_change ? font1 : font2);
2491         }
2492       }
2493
2494       /* correct text size if "digits" is zero or less */
2495       if (size <= 0)
2496         size = strlen(int2str(value, size));
2497
2498       /* dynamically correct text alignment */
2499       pos->width = size * getFontWidth(font);
2500
2501       DrawTextExt(drawto, PANEL_XPOS(pos), PANEL_YPOS(pos),
2502                   int2str(value, size), font, mask_mode);
2503     }
2504     else if (type == TYPE_ELEMENT)
2505     {
2506       int element, graphic;
2507       Bitmap *src_bitmap;
2508       int src_x, src_y;
2509       int width, height;
2510       int dst_x = PANEL_XPOS(pos);
2511       int dst_y = PANEL_YPOS(pos);
2512
2513       if (value != EL_UNDEFINED && value != EL_EMPTY)
2514       {
2515         element = value;
2516         graphic = el2panelimg(value);
2517
2518         // printf("::: %d, '%s' [%d]\n", element, EL_NAME(element), size);
2519
2520         if (element >= EL_GRAPHIC_1 && element <= EL_GRAPHIC_8 && size == 0)
2521           size = TILESIZE;
2522
2523         getSizedGraphicSource(graphic, frame, size, &src_bitmap,
2524                               &src_x, &src_y);
2525
2526         width  = graphic_info[graphic].width  * size / TILESIZE;
2527         height = graphic_info[graphic].height * size / TILESIZE;
2528
2529         if (draw_masked)
2530           BlitBitmapMasked(src_bitmap, drawto, src_x, src_y, width, height,
2531                            dst_x, dst_y);
2532         else
2533           BlitBitmap(src_bitmap, drawto, src_x, src_y, width, height,
2534                      dst_x, dst_y);
2535       }
2536     }
2537     else if (type == TYPE_STRING)
2538     {
2539       boolean active = (value != 0);
2540       char *state_normal = "off";
2541       char *state_active = "on";
2542       char *state = (active ? state_active : state_normal);
2543       char *s = (nr == GAME_PANEL_GRAVITY_STATE ? state :
2544                  nr == GAME_PANEL_PLAYER_NAME   ? setup.player_name :
2545                  nr == GAME_PANEL_LEVEL_NAME    ? level.name :
2546                  nr == GAME_PANEL_LEVEL_AUTHOR  ? level.author : NULL);
2547
2548       if (nr == GAME_PANEL_GRAVITY_STATE)
2549       {
2550         int font1 = pos->font;          /* (used for normal state) */
2551         int font2 = pos->font_alt;      /* (used for active state) */
2552
2553         font = (active ? font2 : font1);
2554       }
2555
2556       if (s != NULL)
2557       {
2558         char *s_cut;
2559
2560         if (size <= 0)
2561         {
2562           /* don't truncate output if "chars" is zero or less */
2563           size = strlen(s);
2564
2565           /* dynamically correct text alignment */
2566           pos->width = size * getFontWidth(font);
2567         }
2568
2569         s_cut = getStringCopyN(s, size);
2570
2571         DrawTextExt(drawto, PANEL_XPOS(pos), PANEL_YPOS(pos),
2572                     s_cut, font, mask_mode);
2573
2574         free(s_cut);
2575       }
2576     }
2577
2578     redraw_mask |= REDRAW_DOOR_1;
2579   }
2580
2581   SetGameStatus(GAME_MODE_PLAYING);
2582 }
2583
2584 void UpdateAndDisplayGameControlValues()
2585 {
2586   if (tape.deactivate_display)
2587     return;
2588
2589   UpdateGameControlValues();
2590   DisplayGameControlValues();
2591 }
2592
2593 void UpdateGameDoorValues()
2594 {
2595   UpdateGameControlValues();
2596 }
2597
2598 void DrawGameDoorValues()
2599 {
2600   DisplayGameControlValues();
2601 }
2602
2603
2604 /*
2605   =============================================================================
2606   InitGameEngine()
2607   -----------------------------------------------------------------------------
2608   initialize game engine due to level / tape version number
2609   =============================================================================
2610 */
2611
2612 static void InitGameEngine()
2613 {
2614   int i, j, k, l, x, y;
2615
2616   /* set game engine from tape file when re-playing, else from level file */
2617   game.engine_version = (tape.playing ? tape.engine_version :
2618                          level.game_version);
2619
2620   /* set single or multi-player game mode (needed for re-playing tapes) */
2621   game.team_mode = setup.team_mode;
2622
2623   if (tape.playing)
2624   {
2625     int num_players = 0;
2626
2627     for (i = 0; i < MAX_PLAYERS; i++)
2628       if (tape.player_participates[i])
2629         num_players++;
2630
2631     /* multi-player tapes contain input data for more than one player */
2632     game.team_mode = (num_players > 1);
2633   }
2634
2635   /* ---------------------------------------------------------------------- */
2636   /* set flags for bugs and changes according to active game engine version */
2637   /* ---------------------------------------------------------------------- */
2638
2639   /*
2640     Summary of bugfix/change:
2641     Fixed handling for custom elements that change when pushed by the player.
2642
2643     Fixed/changed in version:
2644     3.1.0
2645
2646     Description:
2647     Before 3.1.0, custom elements that "change when pushing" changed directly
2648     after the player started pushing them (until then handled in "DigField()").
2649     Since 3.1.0, these custom elements are not changed until the "pushing"
2650     move of the element is finished (now handled in "ContinueMoving()").
2651
2652     Affected levels/tapes:
2653     The first condition is generally needed for all levels/tapes before version
2654     3.1.0, which might use the old behaviour before it was changed; known tapes
2655     that are affected are some tapes from the level set "Walpurgis Gardens" by
2656     Jamie Cullen.
2657     The second condition is an exception from the above case and is needed for
2658     the special case of tapes recorded with game (not engine!) version 3.1.0 or
2659     above (including some development versions of 3.1.0), but before it was
2660     known that this change would break tapes like the above and was fixed in
2661     3.1.1, so that the changed behaviour was active although the engine version
2662     while recording maybe was before 3.1.0. There is at least one tape that is
2663     affected by this exception, which is the tape for the one-level set "Bug
2664     Machine" by Juergen Bonhagen.
2665   */
2666
2667   game.use_change_when_pushing_bug =
2668     (game.engine_version < VERSION_IDENT(3,1,0,0) &&
2669      !(tape.playing &&
2670        tape.game_version >= VERSION_IDENT(3,1,0,0) &&
2671        tape.game_version <  VERSION_IDENT(3,1,1,0)));
2672
2673   /*
2674     Summary of bugfix/change:
2675     Fixed handling for blocking the field the player leaves when moving.
2676
2677     Fixed/changed in version:
2678     3.1.1
2679
2680     Description:
2681     Before 3.1.1, when "block last field when moving" was enabled, the field
2682     the player is leaving when moving was blocked for the time of the move,
2683     and was directly unblocked afterwards. This resulted in the last field
2684     being blocked for exactly one less than the number of frames of one player
2685     move. Additionally, even when blocking was disabled, the last field was
2686     blocked for exactly one frame.
2687     Since 3.1.1, due to changes in player movement handling, the last field
2688     is not blocked at all when blocking is disabled. When blocking is enabled,
2689     the last field is blocked for exactly the number of frames of one player
2690     move. Additionally, if the player is Murphy, the hero of Supaplex, the
2691     last field is blocked for exactly one more than the number of frames of
2692     one player move.
2693
2694     Affected levels/tapes:
2695     (!!! yet to be determined -- probably many !!!)
2696   */
2697
2698   game.use_block_last_field_bug =
2699     (game.engine_version < VERSION_IDENT(3,1,1,0));
2700
2701   game_em.use_single_button =
2702     (game.engine_version > VERSION_IDENT(4,0,0,2));
2703
2704   /* ---------------------------------------------------------------------- */
2705
2706   /* set maximal allowed number of custom element changes per game frame */
2707   game.max_num_changes_per_frame = 1;
2708
2709   /* default scan direction: scan playfield from top/left to bottom/right */
2710   InitPlayfieldScanMode(CA_ARG_SCAN_MODE_NORMAL);
2711
2712   /* dynamically adjust element properties according to game engine version */
2713   InitElementPropertiesEngine(game.engine_version);
2714
2715 #if 0
2716   printf("level %d: level version == %06d\n", level_nr, level.game_version);
2717   printf("          tape version == %06d [%s] [file: %06d]\n",
2718          tape.engine_version, (tape.playing ? "PLAYING" : "RECORDING"),
2719          tape.file_version);
2720   printf("       => game.engine_version == %06d\n", game.engine_version);
2721 #endif
2722
2723   /* ---------- initialize player's initial move delay --------------------- */
2724
2725   /* dynamically adjust player properties according to level information */
2726   for (i = 0; i < MAX_PLAYERS; i++)
2727     game.initial_move_delay_value[i] =
2728       get_move_delay_from_stepsize(level.initial_player_stepsize[i]);
2729
2730   /* dynamically adjust player properties according to game engine version */
2731   for (i = 0; i < MAX_PLAYERS; i++)
2732     game.initial_move_delay[i] =
2733       (game.engine_version <= VERSION_IDENT(2,0,1,0) ?
2734        game.initial_move_delay_value[i] : 0);
2735
2736   /* ---------- initialize player's initial push delay --------------------- */
2737
2738   /* dynamically adjust player properties according to game engine version */
2739   game.initial_push_delay_value =
2740     (game.engine_version < VERSION_IDENT(3,0,7,1) ? 5 : -1);
2741
2742   /* ---------- initialize changing elements ------------------------------- */
2743
2744   /* initialize changing elements information */
2745   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
2746   {
2747     struct ElementInfo *ei = &element_info[i];
2748
2749     /* this pointer might have been changed in the level editor */
2750     ei->change = &ei->change_page[0];
2751
2752     if (!IS_CUSTOM_ELEMENT(i))
2753     {
2754       ei->change->target_element = EL_EMPTY_SPACE;
2755       ei->change->delay_fixed = 0;
2756       ei->change->delay_random = 0;
2757       ei->change->delay_frames = 1;
2758     }
2759
2760     for (j = 0; j < NUM_CHANGE_EVENTS; j++)
2761     {
2762       ei->has_change_event[j] = FALSE;
2763
2764       ei->event_page_nr[j] = 0;
2765       ei->event_page[j] = &ei->change_page[0];
2766     }
2767   }
2768
2769   /* add changing elements from pre-defined list */
2770   for (i = 0; change_delay_list[i].element != EL_UNDEFINED; i++)
2771   {
2772     struct ChangingElementInfo *ch_delay = &change_delay_list[i];
2773     struct ElementInfo *ei = &element_info[ch_delay->element];
2774
2775     ei->change->target_element       = ch_delay->target_element;
2776     ei->change->delay_fixed          = ch_delay->change_delay;
2777
2778     ei->change->pre_change_function  = ch_delay->pre_change_function;
2779     ei->change->change_function      = ch_delay->change_function;
2780     ei->change->post_change_function = ch_delay->post_change_function;
2781
2782     ei->change->can_change = TRUE;
2783     ei->change->can_change_or_has_action = TRUE;
2784
2785     ei->has_change_event[CE_DELAY] = TRUE;
2786
2787     SET_PROPERTY(ch_delay->element, EP_CAN_CHANGE, TRUE);
2788     SET_PROPERTY(ch_delay->element, EP_CAN_CHANGE_OR_HAS_ACTION, TRUE);
2789   }
2790
2791   /* ---------- initialize internal run-time variables --------------------- */
2792
2793   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
2794   {
2795     struct ElementInfo *ei = &element_info[EL_CUSTOM_START + i];
2796
2797     for (j = 0; j < ei->num_change_pages; j++)
2798     {
2799       ei->change_page[j].can_change_or_has_action =
2800         (ei->change_page[j].can_change |
2801          ei->change_page[j].has_action);
2802     }
2803   }
2804
2805   /* add change events from custom element configuration */
2806   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
2807   {
2808     struct ElementInfo *ei = &element_info[EL_CUSTOM_START + i];
2809
2810     for (j = 0; j < ei->num_change_pages; j++)
2811     {
2812       if (!ei->change_page[j].can_change_or_has_action)
2813         continue;
2814
2815       for (k = 0; k < NUM_CHANGE_EVENTS; k++)
2816       {
2817         /* only add event page for the first page found with this event */
2818         if (ei->change_page[j].has_event[k] && !(ei->has_change_event[k]))
2819         {
2820           ei->has_change_event[k] = TRUE;
2821
2822           ei->event_page_nr[k] = j;
2823           ei->event_page[k] = &ei->change_page[j];
2824         }
2825       }
2826     }
2827   }
2828
2829   /* ---------- initialize reference elements in change conditions --------- */
2830
2831   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
2832   {
2833     int element = EL_CUSTOM_START + i;
2834     struct ElementInfo *ei = &element_info[element];
2835
2836     for (j = 0; j < ei->num_change_pages; j++)
2837     {
2838       int trigger_element = ei->change_page[j].initial_trigger_element;
2839
2840       if (trigger_element >= EL_PREV_CE_8 &&
2841           trigger_element <= EL_NEXT_CE_8)
2842         trigger_element = RESOLVED_REFERENCE_ELEMENT(element, trigger_element);
2843
2844       ei->change_page[j].trigger_element = trigger_element;
2845     }
2846   }
2847
2848   /* ---------- initialize run-time trigger player and element ------------- */
2849
2850   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
2851   {
2852     struct ElementInfo *ei = &element_info[EL_CUSTOM_START + i];
2853
2854     for (j = 0; j < ei->num_change_pages; j++)
2855     {
2856       ei->change_page[j].actual_trigger_element = EL_EMPTY;
2857       ei->change_page[j].actual_trigger_player = EL_EMPTY;
2858       ei->change_page[j].actual_trigger_player_bits = CH_PLAYER_NONE;
2859       ei->change_page[j].actual_trigger_side = CH_SIDE_NONE;
2860       ei->change_page[j].actual_trigger_ce_value = 0;
2861       ei->change_page[j].actual_trigger_ce_score = 0;
2862     }
2863   }
2864
2865   /* ---------- initialize trigger events ---------------------------------- */
2866
2867   /* initialize trigger events information */
2868   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
2869     for (j = 0; j < NUM_CHANGE_EVENTS; j++)
2870       trigger_events[i][j] = FALSE;
2871
2872   /* add trigger events from element change event properties */
2873   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
2874   {
2875     struct ElementInfo *ei = &element_info[i];
2876
2877     for (j = 0; j < ei->num_change_pages; j++)
2878     {
2879       if (!ei->change_page[j].can_change_or_has_action)
2880         continue;
2881
2882       if (ei->change_page[j].has_event[CE_BY_OTHER_ACTION])
2883       {
2884         int trigger_element = ei->change_page[j].trigger_element;
2885
2886         for (k = 0; k < NUM_CHANGE_EVENTS; k++)
2887         {
2888           if (ei->change_page[j].has_event[k])
2889           {
2890             if (IS_GROUP_ELEMENT(trigger_element))
2891             {
2892               struct ElementGroupInfo *group =
2893                 element_info[trigger_element].group;
2894
2895               for (l = 0; l < group->num_elements_resolved; l++)
2896                 trigger_events[group->element_resolved[l]][k] = TRUE;
2897             }
2898             else if (trigger_element == EL_ANY_ELEMENT)
2899               for (l = 0; l < MAX_NUM_ELEMENTS; l++)
2900                 trigger_events[l][k] = TRUE;
2901             else
2902               trigger_events[trigger_element][k] = TRUE;
2903           }
2904         }
2905       }
2906     }
2907   }
2908
2909   /* ---------- initialize push delay -------------------------------------- */
2910
2911   /* initialize push delay values to default */
2912   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
2913   {
2914     if (!IS_CUSTOM_ELEMENT(i))
2915     {
2916       /* set default push delay values (corrected since version 3.0.7-1) */
2917       if (game.engine_version < VERSION_IDENT(3,0,7,1))
2918       {
2919         element_info[i].push_delay_fixed = 2;
2920         element_info[i].push_delay_random = 8;
2921       }
2922       else
2923       {
2924         element_info[i].push_delay_fixed = 8;
2925         element_info[i].push_delay_random = 8;
2926       }
2927     }
2928   }
2929
2930   /* set push delay value for certain elements from pre-defined list */
2931   for (i = 0; push_delay_list[i].element != EL_UNDEFINED; i++)
2932   {
2933     int e = push_delay_list[i].element;
2934
2935     element_info[e].push_delay_fixed  = push_delay_list[i].push_delay_fixed;
2936     element_info[e].push_delay_random = push_delay_list[i].push_delay_random;
2937   }
2938
2939   /* set push delay value for Supaplex elements for newer engine versions */
2940   if (game.engine_version >= VERSION_IDENT(3,1,0,0))
2941   {
2942     for (i = 0; i < MAX_NUM_ELEMENTS; i++)
2943     {
2944       if (IS_SP_ELEMENT(i))
2945       {
2946         /* set SP push delay to just enough to push under a falling zonk */
2947         int delay = (game.engine_version >= VERSION_IDENT(3,1,1,0) ? 8 : 6);
2948
2949         element_info[i].push_delay_fixed  = delay;
2950         element_info[i].push_delay_random = 0;
2951       }
2952     }
2953   }
2954
2955   /* ---------- initialize move stepsize ----------------------------------- */
2956
2957   /* initialize move stepsize values to default */
2958   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
2959     if (!IS_CUSTOM_ELEMENT(i))
2960       element_info[i].move_stepsize = MOVE_STEPSIZE_NORMAL;
2961
2962   /* set move stepsize value for certain elements from pre-defined list */
2963   for (i = 0; move_stepsize_list[i].element != EL_UNDEFINED; i++)
2964   {
2965     int e = move_stepsize_list[i].element;
2966
2967     element_info[e].move_stepsize = move_stepsize_list[i].move_stepsize;
2968   }
2969
2970   /* ---------- initialize collect score ----------------------------------- */
2971
2972   /* initialize collect score values for custom elements from initial value */
2973   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
2974     if (IS_CUSTOM_ELEMENT(i))
2975       element_info[i].collect_score = element_info[i].collect_score_initial;
2976
2977   /* ---------- initialize collect count ----------------------------------- */
2978
2979   /* initialize collect count values for non-custom elements */
2980   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
2981     if (!IS_CUSTOM_ELEMENT(i))
2982       element_info[i].collect_count_initial = 0;
2983
2984   /* add collect count values for all elements from pre-defined list */
2985   for (i = 0; collect_count_list[i].element != EL_UNDEFINED; i++)
2986     element_info[collect_count_list[i].element].collect_count_initial =
2987       collect_count_list[i].count;
2988
2989   /* ---------- initialize access direction -------------------------------- */
2990
2991   /* initialize access direction values to default (access from every side) */
2992   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
2993     if (!IS_CUSTOM_ELEMENT(i))
2994       element_info[i].access_direction = MV_ALL_DIRECTIONS;
2995
2996   /* set access direction value for certain elements from pre-defined list */
2997   for (i = 0; access_direction_list[i].element != EL_UNDEFINED; i++)
2998     element_info[access_direction_list[i].element].access_direction =
2999       access_direction_list[i].direction;
3000
3001   /* ---------- initialize explosion content ------------------------------- */
3002   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3003   {
3004     if (IS_CUSTOM_ELEMENT(i))
3005       continue;
3006
3007     for (y = 0; y < 3; y++) for (x = 0; x < 3; x++)
3008     {
3009       /* (content for EL_YAMYAM set at run-time with game.yamyam_content_nr) */
3010
3011       element_info[i].content.e[x][y] =
3012         (i == EL_PLAYER_1 ? EL_EMERALD_YELLOW :
3013          i == EL_PLAYER_2 ? EL_EMERALD_RED :
3014          i == EL_PLAYER_3 ? EL_EMERALD :
3015          i == EL_PLAYER_4 ? EL_EMERALD_PURPLE :
3016          i == EL_MOLE ? EL_EMERALD_RED :
3017          i == EL_PENGUIN ? EL_EMERALD_PURPLE :
3018          i == EL_BUG ? (x == 1 && y == 1 ? EL_DIAMOND : EL_EMERALD) :
3019          i == EL_BD_BUTTERFLY ? EL_BD_DIAMOND :
3020          i == EL_SP_ELECTRON ? EL_SP_INFOTRON :
3021          i == EL_AMOEBA_TO_DIAMOND ? level.amoeba_content :
3022          i == EL_WALL_EMERALD ? EL_EMERALD :
3023          i == EL_WALL_DIAMOND ? EL_DIAMOND :
3024          i == EL_WALL_BD_DIAMOND ? EL_BD_DIAMOND :
3025          i == EL_WALL_EMERALD_YELLOW ? EL_EMERALD_YELLOW :
3026          i == EL_WALL_EMERALD_RED ? EL_EMERALD_RED :
3027          i == EL_WALL_EMERALD_PURPLE ? EL_EMERALD_PURPLE :
3028          i == EL_WALL_PEARL ? EL_PEARL :
3029          i == EL_WALL_CRYSTAL ? EL_CRYSTAL :
3030          EL_EMPTY);
3031     }
3032   }
3033
3034   /* ---------- initialize recursion detection ------------------------------ */
3035   recursion_loop_depth = 0;
3036   recursion_loop_detected = FALSE;
3037   recursion_loop_element = EL_UNDEFINED;
3038
3039   /* ---------- initialize graphics engine ---------------------------------- */
3040   game.scroll_delay_value =
3041     (game.forced_scroll_delay_value != -1 ? game.forced_scroll_delay_value :
3042      setup.scroll_delay                   ? setup.scroll_delay_value       : 0);
3043   game.scroll_delay_value =
3044     MIN(MAX(MIN_SCROLL_DELAY, game.scroll_delay_value), MAX_SCROLL_DELAY);
3045
3046   /* ---------- initialize game engine snapshots ---------------------------- */
3047   for (i = 0; i < MAX_PLAYERS; i++)
3048     game.snapshot.last_action[i] = 0;
3049   game.snapshot.changed_action = FALSE;
3050   game.snapshot.collected_item = FALSE;
3051   game.snapshot.mode =
3052     (strEqual(setup.engine_snapshot_mode, STR_SNAPSHOT_MODE_EVERY_STEP) ?
3053      SNAPSHOT_MODE_EVERY_STEP :
3054      strEqual(setup.engine_snapshot_mode, STR_SNAPSHOT_MODE_EVERY_MOVE) ?
3055      SNAPSHOT_MODE_EVERY_MOVE :
3056      strEqual(setup.engine_snapshot_mode, STR_SNAPSHOT_MODE_EVERY_COLLECT) ?
3057      SNAPSHOT_MODE_EVERY_COLLECT : SNAPSHOT_MODE_OFF);
3058   game.snapshot.save_snapshot = FALSE;
3059 }
3060
3061 int get_num_special_action(int element, int action_first, int action_last)
3062 {
3063   int num_special_action = 0;
3064   int i, j;
3065
3066   for (i = action_first; i <= action_last; i++)
3067   {
3068     boolean found = FALSE;
3069
3070     for (j = 0; j < NUM_DIRECTIONS; j++)
3071       if (el_act_dir2img(element, i, j) !=
3072           el_act_dir2img(element, ACTION_DEFAULT, j))
3073         found = TRUE;
3074
3075     if (found)
3076       num_special_action++;
3077     else
3078       break;
3079   }
3080
3081   return num_special_action;
3082 }
3083
3084
3085 /*
3086   =============================================================================
3087   InitGame()
3088   -----------------------------------------------------------------------------
3089   initialize and start new game
3090   =============================================================================
3091 */
3092
3093 void InitGame()
3094 {
3095   int full_lev_fieldx = lev_fieldx + (BorderElement != EL_EMPTY ? 2 : 0);
3096   int full_lev_fieldy = lev_fieldy + (BorderElement != EL_EMPTY ? 2 : 0);
3097   int fade_mask = REDRAW_FIELD;
3098
3099   boolean emulate_bd = TRUE;    /* unless non-BOULDERDASH elements found */
3100   boolean emulate_sb = TRUE;    /* unless non-SOKOBAN     elements found */
3101   boolean emulate_sp = TRUE;    /* unless non-SUPAPLEX    elements found */
3102   int initial_move_dir = MV_DOWN;
3103   int i, j, x, y;
3104
3105   // required here to update video display before fading (FIX THIS)
3106   DrawMaskedBorder(REDRAW_DOOR_2);
3107
3108   if (!game.restart_level)
3109     CloseDoor(DOOR_CLOSE_1);
3110
3111   SetGameStatus(GAME_MODE_PLAYING);
3112
3113   if (level_editor_test_game)
3114     FadeSkipNextFadeIn();
3115   else
3116     FadeSetEnterScreen();
3117
3118   if (CheckIfGlobalBorderHasChanged())
3119     fade_mask = REDRAW_ALL;
3120
3121   FadeSoundsAndMusic();
3122
3123   ExpireSoundLoops(TRUE);
3124
3125   FadeOut(fade_mask);
3126
3127   /* needed if different viewport properties defined for playing */
3128   ChangeViewportPropertiesIfNeeded();
3129
3130   ClearField();
3131
3132   OpenDoor(GetDoorState() | DOOR_NO_DELAY | DOOR_FORCE_REDRAW);
3133
3134   DrawCompleteVideoDisplay();
3135
3136   InitGameEngine();
3137   InitGameControlValues();
3138
3139   /* don't play tapes over network */
3140   network_playing = (options.network && !tape.playing);
3141
3142   for (i = 0; i < MAX_PLAYERS; i++)
3143   {
3144     struct PlayerInfo *player = &stored_player[i];
3145
3146     player->index_nr = i;
3147     player->index_bit = (1 << i);
3148     player->element_nr = EL_PLAYER_1 + i;
3149
3150     player->present = FALSE;
3151     player->active = FALSE;
3152     player->mapped = FALSE;
3153
3154     player->killed = FALSE;
3155     player->reanimated = FALSE;
3156
3157     player->action = 0;
3158     player->effective_action = 0;
3159     player->programmed_action = 0;
3160
3161     player->score = 0;
3162     player->score_final = 0;
3163
3164     player->gems_still_needed = level.gems_needed;
3165     player->sokobanfields_still_needed = 0;
3166     player->lights_still_needed = 0;
3167     player->friends_still_needed = 0;
3168
3169     for (j = 0; j < MAX_NUM_KEYS; j++)
3170       player->key[j] = FALSE;
3171
3172     player->num_white_keys = 0;
3173
3174     player->dynabomb_count = 0;
3175     player->dynabomb_size = 1;
3176     player->dynabombs_left = 0;
3177     player->dynabomb_xl = FALSE;
3178
3179     player->MovDir = initial_move_dir;
3180     player->MovPos = 0;
3181     player->GfxPos = 0;
3182     player->GfxDir = initial_move_dir;
3183     player->GfxAction = ACTION_DEFAULT;
3184     player->Frame = 0;
3185     player->StepFrame = 0;
3186
3187     player->initial_element = player->element_nr;
3188     player->artwork_element =
3189       (level.use_artwork_element[i] ? level.artwork_element[i] :
3190        player->element_nr);
3191     player->use_murphy = FALSE;
3192
3193     player->block_last_field = FALSE;   /* initialized in InitPlayerField() */
3194     player->block_delay_adjustment = 0; /* initialized in InitPlayerField() */
3195
3196     player->gravity = level.initial_player_gravity[i];
3197
3198     player->can_fall_into_acid = CAN_MOVE_INTO_ACID(player->element_nr);
3199
3200     player->actual_frame_counter = 0;
3201
3202     player->step_counter = 0;
3203
3204     player->last_move_dir = initial_move_dir;
3205
3206     player->is_active = FALSE;
3207
3208     player->is_waiting = FALSE;
3209     player->is_moving = FALSE;
3210     player->is_auto_moving = FALSE;
3211     player->is_digging = FALSE;
3212     player->is_snapping = FALSE;
3213     player->is_collecting = FALSE;
3214     player->is_pushing = FALSE;
3215     player->is_switching = FALSE;
3216     player->is_dropping = FALSE;
3217     player->is_dropping_pressed = FALSE;
3218
3219     player->is_bored = FALSE;
3220     player->is_sleeping = FALSE;
3221
3222     player->was_waiting = TRUE;
3223     player->was_moving = FALSE;
3224     player->was_snapping = FALSE;
3225     player->was_dropping = FALSE;
3226
3227     player->force_dropping = FALSE;
3228
3229     player->frame_counter_bored = -1;
3230     player->frame_counter_sleeping = -1;
3231
3232     player->anim_delay_counter = 0;
3233     player->post_delay_counter = 0;
3234
3235     player->dir_waiting = initial_move_dir;
3236     player->action_waiting = ACTION_DEFAULT;
3237     player->last_action_waiting = ACTION_DEFAULT;
3238     player->special_action_bored = ACTION_DEFAULT;
3239     player->special_action_sleeping = ACTION_DEFAULT;
3240
3241     player->switch_x = -1;
3242     player->switch_y = -1;
3243
3244     player->drop_x = -1;
3245     player->drop_y = -1;
3246
3247     player->show_envelope = 0;
3248
3249     SetPlayerMoveSpeed(player, level.initial_player_stepsize[i], TRUE);
3250
3251     player->push_delay       = -1;      /* initialized when pushing starts */
3252     player->push_delay_value = game.initial_push_delay_value;
3253
3254     player->drop_delay = 0;
3255     player->drop_pressed_delay = 0;
3256
3257     player->last_jx = -1;
3258     player->last_jy = -1;
3259     player->jx = -1;
3260     player->jy = -1;
3261
3262     player->shield_normal_time_left = 0;
3263     player->shield_deadly_time_left = 0;
3264
3265     player->inventory_infinite_element = EL_UNDEFINED;
3266     player->inventory_size = 0;
3267
3268     if (level.use_initial_inventory[i])
3269     {
3270       for (j = 0; j < level.initial_inventory_size[i]; j++)
3271       {
3272         int element = level.initial_inventory_content[i][j];
3273         int collect_count = element_info[element].collect_count_initial;
3274         int k;
3275
3276         if (!IS_CUSTOM_ELEMENT(element))
3277           collect_count = 1;
3278
3279         if (collect_count == 0)
3280           player->inventory_infinite_element = element;
3281         else
3282           for (k = 0; k < collect_count; k++)
3283             if (player->inventory_size < MAX_INVENTORY_SIZE)
3284               player->inventory_element[player->inventory_size++] = element;
3285       }
3286     }
3287
3288     DigField(player, 0, 0, 0, 0, 0, 0, DF_NO_PUSH);
3289     SnapField(player, 0, 0);
3290
3291     player->LevelSolved = FALSE;
3292     player->GameOver = FALSE;
3293
3294     player->LevelSolved_GameWon = FALSE;
3295     player->LevelSolved_GameEnd = FALSE;
3296     player->LevelSolved_PanelOff = FALSE;
3297     player->LevelSolved_SaveTape = FALSE;
3298     player->LevelSolved_SaveScore = FALSE;
3299     player->LevelSolved_CountingTime = 0;
3300     player->LevelSolved_CountingScore = 0;
3301
3302     map_player_action[i] = i;
3303   }
3304
3305   network_player_action_received = FALSE;
3306
3307 #if defined(NETWORK_AVALIABLE)
3308   /* initial null action */
3309   if (network_playing)
3310     SendToServer_MovePlayer(MV_NONE);
3311 #endif
3312
3313   ZX = ZY = -1;
3314   ExitX = ExitY = -1;
3315
3316   FrameCounter = 0;
3317   TimeFrames = 0;
3318   TimePlayed = 0;
3319   TimeLeft = level.time;
3320   TapeTime = 0;
3321
3322   ScreenMovDir = MV_NONE;
3323   ScreenMovPos = 0;
3324   ScreenGfxPos = 0;
3325
3326   ScrollStepSize = 0;   /* will be correctly initialized by ScrollScreen() */
3327
3328   AllPlayersGone = FALSE;
3329
3330   game.no_time_limit = (level.time == 0);
3331
3332   game.yamyam_content_nr = 0;
3333   game.robot_wheel_active = FALSE;
3334   game.magic_wall_active = FALSE;
3335   game.magic_wall_time_left = 0;
3336   game.light_time_left = 0;
3337   game.timegate_time_left = 0;
3338   game.switchgate_pos = 0;
3339   game.wind_direction = level.wind_direction_initial;
3340
3341   game.lenses_time_left = 0;
3342   game.magnify_time_left = 0;
3343
3344   game.ball_state = level.ball_state_initial;
3345   game.ball_content_nr = 0;
3346
3347   game.envelope_active = FALSE;
3348
3349   /* set focus to local player for network games, else to all players */
3350   game.centered_player_nr = (network_playing ? local_player->index_nr : -1);
3351   game.centered_player_nr_next = game.centered_player_nr;
3352   game.set_centered_player = FALSE;
3353
3354   if (network_playing && tape.recording)
3355   {
3356     /* store client dependent player focus when recording network games */
3357     tape.centered_player_nr_next = game.centered_player_nr_next;
3358     tape.set_centered_player = TRUE;
3359   }
3360
3361   for (i = 0; i < NUM_BELTS; i++)
3362   {
3363     game.belt_dir[i] = MV_NONE;
3364     game.belt_dir_nr[i] = 3;            /* not moving, next moving left */
3365   }
3366
3367   for (i = 0; i < MAX_NUM_AMOEBA; i++)
3368     AmoebaCnt[i] = AmoebaCnt2[i] = 0;
3369
3370 #if DEBUG_INIT_PLAYER
3371   if (options.debug)
3372   {
3373     printf("Player status at level initialization:\n");
3374   }
3375 #endif
3376
3377   SCAN_PLAYFIELD(x, y)
3378   {
3379     Feld[x][y] = level.field[x][y];
3380     MovPos[x][y] = MovDir[x][y] = MovDelay[x][y] = 0;
3381     ChangeDelay[x][y] = 0;
3382     ChangePage[x][y] = -1;
3383     CustomValue[x][y] = 0;              /* initialized in InitField() */
3384     Store[x][y] = Store2[x][y] = StorePlayer[x][y] = Back[x][y] = 0;
3385     AmoebaNr[x][y] = 0;
3386     WasJustMoving[x][y] = 0;
3387     WasJustFalling[x][y] = 0;
3388     CheckCollision[x][y] = 0;
3389     CheckImpact[x][y] = 0;
3390     Stop[x][y] = FALSE;
3391     Pushed[x][y] = FALSE;
3392
3393     ChangeCount[x][y] = 0;
3394     ChangeEvent[x][y] = -1;
3395
3396     ExplodePhase[x][y] = 0;
3397     ExplodeDelay[x][y] = 0;
3398     ExplodeField[x][y] = EX_TYPE_NONE;
3399
3400     RunnerVisit[x][y] = 0;
3401     PlayerVisit[x][y] = 0;
3402
3403     GfxFrame[x][y] = 0;
3404     GfxRandom[x][y] = INIT_GFX_RANDOM();
3405     GfxElement[x][y] = EL_UNDEFINED;
3406     GfxAction[x][y] = ACTION_DEFAULT;
3407     GfxDir[x][y] = MV_NONE;
3408     GfxRedraw[x][y] = GFX_REDRAW_NONE;
3409   }
3410
3411   SCAN_PLAYFIELD(x, y)
3412   {
3413     if (emulate_bd && !IS_BD_ELEMENT(Feld[x][y]))
3414       emulate_bd = FALSE;
3415     if (emulate_sb && !IS_SB_ELEMENT(Feld[x][y]))
3416       emulate_sb = FALSE;
3417     if (emulate_sp && !IS_SP_ELEMENT(Feld[x][y]))
3418       emulate_sp = FALSE;
3419
3420     InitField(x, y, TRUE);
3421
3422     ResetGfxAnimation(x, y);
3423   }
3424
3425   InitBeltMovement();
3426
3427   for (i = 0; i < MAX_PLAYERS; i++)
3428   {
3429     struct PlayerInfo *player = &stored_player[i];
3430
3431     /* set number of special actions for bored and sleeping animation */
3432     player->num_special_action_bored =
3433       get_num_special_action(player->artwork_element,
3434                              ACTION_BORING_1, ACTION_BORING_LAST);
3435     player->num_special_action_sleeping =
3436       get_num_special_action(player->artwork_element,
3437                              ACTION_SLEEPING_1, ACTION_SLEEPING_LAST);
3438   }
3439
3440   game.emulation = (emulate_bd ? EMU_BOULDERDASH :
3441                     emulate_sb ? EMU_SOKOBAN :
3442                     emulate_sp ? EMU_SUPAPLEX : EMU_NONE);
3443
3444   /* initialize type of slippery elements */
3445   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3446   {
3447     if (!IS_CUSTOM_ELEMENT(i))
3448     {
3449       /* default: elements slip down either to the left or right randomly */
3450       element_info[i].slippery_type = SLIPPERY_ANY_RANDOM;
3451
3452       /* SP style elements prefer to slip down on the left side */
3453       if (game.engine_version >= VERSION_IDENT(3,1,1,0) && IS_SP_ELEMENT(i))
3454         element_info[i].slippery_type = SLIPPERY_ANY_LEFT_RIGHT;
3455
3456       /* BD style elements prefer to slip down on the left side */
3457       if (game.emulation == EMU_BOULDERDASH)
3458         element_info[i].slippery_type = SLIPPERY_ANY_LEFT_RIGHT;
3459     }
3460   }
3461
3462   /* initialize explosion and ignition delay */
3463   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
3464   {
3465     if (!IS_CUSTOM_ELEMENT(i))
3466     {
3467       int num_phase = 8;
3468       int delay = (((IS_SP_ELEMENT(i) && i != EL_EMPTY_SPACE) &&
3469                     game.engine_version >= VERSION_IDENT(3,1,0,0)) ||
3470                    game.emulation == EMU_SUPAPLEX ? 3 : 2);
3471       int last_phase = (num_phase + 1) * delay;
3472       int half_phase = (num_phase / 2) * delay;
3473
3474       element_info[i].explosion_delay = last_phase - 1;
3475       element_info[i].ignition_delay = half_phase;
3476
3477       if (i == EL_BLACK_ORB)
3478         element_info[i].ignition_delay = 1;
3479     }
3480   }
3481
3482   /* correct non-moving belts to start moving left */
3483   for (i = 0; i < NUM_BELTS; i++)
3484     if (game.belt_dir[i] == MV_NONE)
3485       game.belt_dir_nr[i] = 3;          /* not moving, next moving left */
3486
3487 #if USE_NEW_PLAYER_ASSIGNMENTS
3488   /* !!! SAME AS init.c:InitPlayerInfo() -- FIX THIS !!! */
3489   /* choose default local player */
3490   local_player = &stored_player[0];
3491
3492   for (i = 0; i < MAX_PLAYERS; i++)
3493     stored_player[i].connected = FALSE;
3494
3495   local_player->connected = TRUE;
3496   /* !!! SAME AS init.c:InitPlayerInfo() -- FIX THIS !!! */
3497
3498   if (tape.playing)
3499   {
3500     for (i = 0; i < MAX_PLAYERS; i++)
3501       stored_player[i].connected = tape.player_participates[i];
3502   }
3503   else if (game.team_mode && !options.network)
3504   {
3505     /* try to guess locally connected team mode players (needed for correct
3506        assignment of player figures from level to locally playing players) */
3507
3508     for (i = 0; i < MAX_PLAYERS; i++)
3509       if (setup.input[i].use_joystick ||
3510           setup.input[i].key.left != KSYM_UNDEFINED)
3511         stored_player[i].connected = TRUE;
3512   }
3513
3514 #if DEBUG_INIT_PLAYER
3515   if (options.debug)
3516   {
3517     printf("Player status after level initialization:\n");
3518
3519     for (i = 0; i < MAX_PLAYERS; i++)
3520     {
3521       struct PlayerInfo *player = &stored_player[i];
3522
3523       printf("- player %d: present == %d, connected == %d, active == %d",
3524              i + 1,
3525              player->present,
3526              player->connected,
3527              player->active);
3528
3529       if (local_player == player)
3530         printf(" (local player)");
3531
3532       printf("\n");
3533     }
3534   }
3535 #endif
3536
3537 #if DEBUG_INIT_PLAYER
3538   if (options.debug)
3539     printf("Reassigning players ...\n");
3540 #endif
3541
3542   /* check if any connected player was not found in playfield */
3543   for (i = 0; i < MAX_PLAYERS; i++)
3544   {
3545     struct PlayerInfo *player = &stored_player[i];
3546
3547     if (player->connected && !player->present)
3548     {
3549       struct PlayerInfo *field_player = NULL;
3550
3551 #if DEBUG_INIT_PLAYER
3552       if (options.debug)
3553         printf("- looking for field player for player %d ...\n", i + 1);
3554 #endif
3555
3556       /* assign first free player found that is present in the playfield */
3557
3558       /* first try: look for unmapped playfield player that is not connected */
3559       for (j = 0; j < MAX_PLAYERS; j++)
3560         if (field_player == NULL &&
3561             stored_player[j].present &&
3562             !stored_player[j].mapped &&
3563             !stored_player[j].connected)
3564           field_player = &stored_player[j];
3565
3566       /* second try: look for *any* unmapped playfield player */
3567       for (j = 0; j < MAX_PLAYERS; j++)
3568         if (field_player == NULL &&
3569             stored_player[j].present &&
3570             !stored_player[j].mapped)
3571           field_player = &stored_player[j];
3572
3573       if (field_player != NULL)
3574       {
3575         int jx = field_player->jx, jy = field_player->jy;
3576
3577 #if DEBUG_INIT_PLAYER
3578         if (options.debug)
3579           printf("- found player %d\n", field_player->index_nr + 1);
3580 #endif
3581
3582         player->present = FALSE;
3583         player->active = FALSE;
3584
3585         field_player->present = TRUE;
3586         field_player->active = TRUE;
3587
3588         /*
3589         player->initial_element = field_player->initial_element;
3590         player->artwork_element = field_player->artwork_element;
3591
3592         player->block_last_field       = field_player->block_last_field;
3593         player->block_delay_adjustment = field_player->block_delay_adjustment;
3594         */
3595
3596         StorePlayer[jx][jy] = field_player->element_nr;
3597
3598         field_player->jx = field_player->last_jx = jx;
3599         field_player->jy = field_player->last_jy = jy;
3600
3601         if (local_player == player)
3602           local_player = field_player;
3603
3604         map_player_action[field_player->index_nr] = i;
3605
3606         field_player->mapped = TRUE;
3607
3608 #if DEBUG_INIT_PLAYER
3609         if (options.debug)
3610           printf("- map_player_action[%d] == %d\n",
3611                  field_player->index_nr + 1, i + 1);
3612 #endif
3613       }
3614     }
3615
3616     if (player->connected && player->present)
3617       player->mapped = TRUE;
3618   }
3619
3620 #if DEBUG_INIT_PLAYER
3621   if (options.debug)
3622   {
3623     printf("Player status after player assignment (first stage):\n");
3624
3625     for (i = 0; i < MAX_PLAYERS; i++)
3626     {
3627       struct PlayerInfo *player = &stored_player[i];
3628
3629       printf("- player %d: present == %d, connected == %d, active == %d",
3630              i + 1,
3631              player->present,
3632              player->connected,
3633              player->active);
3634
3635       if (local_player == player)
3636         printf(" (local player)");
3637
3638       printf("\n");
3639     }
3640   }
3641 #endif
3642
3643 #else
3644
3645   /* check if any connected player was not found in playfield */
3646   for (i = 0; i < MAX_PLAYERS; i++)
3647   {
3648     struct PlayerInfo *player = &stored_player[i];
3649
3650     if (player->connected && !player->present)
3651     {
3652       for (j = 0; j < MAX_PLAYERS; j++)
3653       {
3654         struct PlayerInfo *field_player = &stored_player[j];
3655         int jx = field_player->jx, jy = field_player->jy;
3656
3657         /* assign first free player found that is present in the playfield */
3658         if (field_player->present && !field_player->connected)
3659         {
3660           player->present = TRUE;
3661           player->active = TRUE;
3662
3663           field_player->present = FALSE;
3664           field_player->active = FALSE;
3665
3666           player->initial_element = field_player->initial_element;
3667           player->artwork_element = field_player->artwork_element;
3668
3669           player->block_last_field       = field_player->block_last_field;
3670           player->block_delay_adjustment = field_player->block_delay_adjustment;
3671
3672           StorePlayer[jx][jy] = player->element_nr;
3673
3674           player->jx = player->last_jx = jx;
3675           player->jy = player->last_jy = jy;
3676
3677           break;
3678         }
3679       }
3680     }
3681   }
3682 #endif
3683
3684 #if 0
3685   printf("::: local_player->present == %d\n", local_player->present);
3686 #endif
3687
3688   if (tape.playing)
3689   {
3690     /* when playing a tape, eliminate all players who do not participate */
3691
3692 #if USE_NEW_PLAYER_ASSIGNMENTS
3693
3694     if (!game.team_mode)
3695     {
3696       for (i = 0; i < MAX_PLAYERS; i++)
3697       {
3698         if (stored_player[i].active &&
3699             !tape.player_participates[map_player_action[i]])
3700         {
3701           struct PlayerInfo *player = &stored_player[i];
3702           int jx = player->jx, jy = player->jy;
3703
3704 #if DEBUG_INIT_PLAYER
3705           if (options.debug)
3706             printf("Removing player %d at (%d, %d)\n", i + 1, jx, jy);
3707 #endif
3708
3709           player->active = FALSE;
3710           StorePlayer[jx][jy] = 0;
3711           Feld[jx][jy] = EL_EMPTY;
3712         }
3713       }
3714     }
3715
3716 #else
3717
3718     for (i = 0; i < MAX_PLAYERS; i++)
3719     {
3720       if (stored_player[i].active &&
3721           !tape.player_participates[i])
3722       {
3723         struct PlayerInfo *player = &stored_player[i];
3724         int jx = player->jx, jy = player->jy;
3725
3726         player->active = FALSE;
3727         StorePlayer[jx][jy] = 0;
3728         Feld[jx][jy] = EL_EMPTY;
3729       }
3730     }
3731 #endif
3732   }
3733   else if (!options.network && !game.team_mode)         /* && !tape.playing */
3734   {
3735     /* when in single player mode, eliminate all but the first active player */
3736
3737     for (i = 0; i < MAX_PLAYERS; i++)
3738     {
3739       if (stored_player[i].active)
3740       {
3741         for (j = i + 1; j < MAX_PLAYERS; j++)
3742         {
3743           if (stored_player[j].active)
3744           {
3745             struct PlayerInfo *player = &stored_player[j];
3746             int jx = player->jx, jy = player->jy;
3747
3748             player->active = FALSE;
3749             player->present = FALSE;
3750
3751             StorePlayer[jx][jy] = 0;
3752             Feld[jx][jy] = EL_EMPTY;
3753           }
3754         }
3755       }
3756     }
3757   }
3758
3759   /* when recording the game, store which players take part in the game */
3760   if (tape.recording)
3761   {
3762 #if USE_NEW_PLAYER_ASSIGNMENTS
3763     for (i = 0; i < MAX_PLAYERS; i++)
3764       if (stored_player[i].connected)
3765         tape.player_participates[i] = TRUE;
3766 #else
3767     for (i = 0; i < MAX_PLAYERS; i++)
3768       if (stored_player[i].active)
3769         tape.player_participates[i] = TRUE;
3770 #endif
3771   }
3772
3773 #if DEBUG_INIT_PLAYER
3774   if (options.debug)
3775   {
3776     printf("Player status after player assignment (final stage):\n");
3777
3778     for (i = 0; i < MAX_PLAYERS; i++)
3779     {
3780       struct PlayerInfo *player = &stored_player[i];
3781
3782       printf("- player %d: present == %d, connected == %d, active == %d",
3783              i + 1,
3784              player->present,
3785              player->connected,
3786              player->active);
3787
3788       if (local_player == player)
3789         printf(" (local player)");
3790
3791       printf("\n");
3792     }
3793   }
3794 #endif
3795
3796   if (BorderElement == EL_EMPTY)
3797   {
3798     SBX_Left = 0;
3799     SBX_Right = lev_fieldx - SCR_FIELDX;
3800     SBY_Upper = 0;
3801     SBY_Lower = lev_fieldy - SCR_FIELDY;
3802   }
3803   else
3804   {
3805     SBX_Left = -1;
3806     SBX_Right = lev_fieldx - SCR_FIELDX + 1;
3807     SBY_Upper = -1;
3808     SBY_Lower = lev_fieldy - SCR_FIELDY + 1;
3809   }
3810
3811   if (full_lev_fieldx <= SCR_FIELDX)
3812     SBX_Left = SBX_Right = -1 * (SCR_FIELDX - lev_fieldx) / 2;
3813   if (full_lev_fieldy <= SCR_FIELDY)
3814     SBY_Upper = SBY_Lower = -1 * (SCR_FIELDY - lev_fieldy) / 2;
3815
3816   if (EVEN(SCR_FIELDX) && full_lev_fieldx > SCR_FIELDX)
3817     SBX_Left--;
3818   if (EVEN(SCR_FIELDY) && full_lev_fieldy > SCR_FIELDY)
3819     SBY_Upper--;
3820
3821   /* if local player not found, look for custom element that might create
3822      the player (make some assumptions about the right custom element) */
3823   if (!local_player->present)
3824   {
3825     int start_x = 0, start_y = 0;
3826     int found_rating = 0;
3827     int found_element = EL_UNDEFINED;
3828     int player_nr = local_player->index_nr;
3829
3830     SCAN_PLAYFIELD(x, y)
3831     {
3832       int element = Feld[x][y];
3833       int content;
3834       int xx, yy;
3835       boolean is_player;
3836
3837       if (level.use_start_element[player_nr] &&
3838           level.start_element[player_nr] == element &&
3839           found_rating < 4)
3840       {
3841         start_x = x;
3842         start_y = y;
3843
3844         found_rating = 4;
3845         found_element = element;
3846       }
3847
3848       if (!IS_CUSTOM_ELEMENT(element))
3849         continue;
3850
3851       if (CAN_CHANGE(element))
3852       {
3853         for (i = 0; i < element_info[element].num_change_pages; i++)
3854         {
3855           /* check for player created from custom element as single target */
3856           content = element_info[element].change_page[i].target_element;
3857           is_player = ELEM_IS_PLAYER(content);
3858
3859           if (is_player && (found_rating < 3 ||
3860                             (found_rating == 3 && element < found_element)))
3861           {
3862             start_x = x;
3863             start_y = y;
3864
3865             found_rating = 3;
3866             found_element = element;
3867           }
3868         }
3869       }
3870
3871       for (yy = 0; yy < 3; yy++) for (xx = 0; xx < 3; xx++)
3872       {
3873         /* check for player created from custom element as explosion content */
3874         content = element_info[element].content.e[xx][yy];
3875         is_player = ELEM_IS_PLAYER(content);
3876
3877         if (is_player && (found_rating < 2 ||
3878                           (found_rating == 2 && element < found_element)))
3879         {
3880           start_x = x + xx - 1;
3881           start_y = y + yy - 1;
3882
3883           found_rating = 2;
3884           found_element = element;
3885         }
3886
3887         if (!CAN_CHANGE(element))
3888           continue;
3889
3890         for (i = 0; i < element_info[element].num_change_pages; i++)
3891         {
3892           /* check for player created from custom element as extended target */
3893           content =
3894             element_info[element].change_page[i].target_content.e[xx][yy];
3895
3896           is_player = ELEM_IS_PLAYER(content);
3897
3898           if (is_player && (found_rating < 1 ||
3899                             (found_rating == 1 && element < found_element)))
3900           {
3901             start_x = x + xx - 1;
3902             start_y = y + yy - 1;
3903
3904             found_rating = 1;
3905             found_element = element;
3906           }
3907         }
3908       }
3909     }
3910
3911     scroll_x = SCROLL_POSITION_X(start_x);
3912     scroll_y = SCROLL_POSITION_Y(start_y);
3913   }
3914   else
3915   {
3916     scroll_x = SCROLL_POSITION_X(local_player->jx);
3917     scroll_y = SCROLL_POSITION_Y(local_player->jy);
3918   }
3919
3920   /* !!! FIX THIS (START) !!! */
3921   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
3922   {
3923     InitGameEngine_EM();
3924   }
3925   else if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
3926   {
3927     InitGameEngine_SP();
3928   }
3929   else
3930   {
3931     DrawLevel(REDRAW_FIELD);
3932     DrawAllPlayers();
3933
3934     /* after drawing the level, correct some elements */
3935     if (game.timegate_time_left == 0)
3936       CloseAllOpenTimegates();
3937   }
3938
3939   /* blit playfield from scroll buffer to normal back buffer for fading in */
3940   BlitScreenToBitmap(backbuffer);
3941   /* !!! FIX THIS (END) !!! */
3942
3943   DrawMaskedBorder(fade_mask);
3944
3945   FadeIn(fade_mask);
3946
3947 #if 1
3948   // full screen redraw is required at this point in the following cases:
3949   // - special editor door undrawn when game was started from level editor
3950   // - drawing area (playfield) was changed and has to be removed completely
3951   redraw_mask = REDRAW_ALL;
3952   BackToFront();
3953 #endif
3954
3955   if (!game.restart_level)
3956   {
3957     /* copy default game door content to main double buffer */
3958
3959     /* !!! CHECK AGAIN !!! */
3960     SetPanelBackground();
3961     // SetDoorBackgroundImage(IMG_BACKGROUND_PANEL);
3962     DrawBackground(DX, DY, DXSIZE, DYSIZE);
3963   }
3964
3965   SetPanelBackground();
3966   SetDrawBackgroundMask(REDRAW_DOOR_1);
3967
3968   UpdateAndDisplayGameControlValues();
3969
3970   if (!game.restart_level)
3971   {
3972     UnmapGameButtons();
3973     UnmapTapeButtons();
3974
3975     FreeGameButtons();
3976     CreateGameButtons();
3977
3978     game_gadget[SOUND_CTRL_ID_MUSIC]->checked = setup.sound_music;
3979     game_gadget[SOUND_CTRL_ID_LOOPS]->checked = setup.sound_loops;
3980     game_gadget[SOUND_CTRL_ID_SIMPLE]->checked = setup.sound_simple;
3981
3982     MapGameButtons();
3983     MapTapeButtons();
3984
3985     /* copy actual game door content to door double buffer for OpenDoor() */
3986     BlitBitmap(drawto, bitmap_db_door_1, DX, DY, DXSIZE, DYSIZE, 0, 0);
3987
3988     OpenDoor(DOOR_OPEN_ALL);
3989
3990     PlaySound(SND_GAME_STARTING);
3991
3992     if (setup.sound_music)
3993       PlayLevelMusic();
3994
3995     KeyboardAutoRepeatOffUnlessAutoplay();
3996
3997 #if DEBUG_INIT_PLAYER
3998     if (options.debug)
3999     {
4000       printf("Player status (final):\n");
4001
4002       for (i = 0; i < MAX_PLAYERS; i++)
4003       {
4004         struct PlayerInfo *player = &stored_player[i];
4005
4006         printf("- player %d: present == %d, connected == %d, active == %d",
4007                i + 1,
4008                player->present,
4009                player->connected,
4010                player->active);
4011
4012         if (local_player == player)
4013           printf(" (local player)");
4014
4015         printf("\n");
4016       }
4017     }
4018 #endif
4019   }
4020
4021   UnmapAllGadgets();
4022
4023   MapGameButtons();
4024   MapTapeButtons();
4025
4026   if (!game.restart_level && !tape.playing)
4027   {
4028     LevelStats_incPlayed(level_nr);
4029
4030     SaveLevelSetup_SeriesInfo();
4031   }
4032
4033   game.restart_level = FALSE;
4034
4035   SaveEngineSnapshotToListInitial();
4036 }
4037
4038 void UpdateEngineValues(int actual_scroll_x, int actual_scroll_y,
4039                         int actual_player_x, int actual_player_y)
4040 {
4041   /* this is used for non-R'n'D game engines to update certain engine values */
4042
4043   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
4044   {
4045     actual_player_x = correctLevelPosX_EM(actual_player_x);
4046     actual_player_y = correctLevelPosY_EM(actual_player_y);
4047   }
4048
4049   /* needed to determine if sounds are played within the visible screen area */
4050   scroll_x = actual_scroll_x;
4051   scroll_y = actual_scroll_y;
4052
4053   /* needed to get player position for "follow finger" playing input method */
4054   local_player->jx = actual_player_x;
4055   local_player->jy = actual_player_y;
4056 }
4057
4058 void InitMovDir(int x, int y)
4059 {
4060   int i, element = Feld[x][y];
4061   static int xy[4][2] =
4062   {
4063     {  0, +1 },
4064     { +1,  0 },
4065     {  0, -1 },
4066     { -1,  0 }
4067   };
4068   static int direction[3][4] =
4069   {
4070     { MV_RIGHT, MV_UP,   MV_LEFT,  MV_DOWN },
4071     { MV_LEFT,  MV_DOWN, MV_RIGHT, MV_UP },
4072     { MV_LEFT,  MV_RIGHT, MV_UP, MV_DOWN }
4073   };
4074
4075   switch (element)
4076   {
4077     case EL_BUG_RIGHT:
4078     case EL_BUG_UP:
4079     case EL_BUG_LEFT:
4080     case EL_BUG_DOWN:
4081       Feld[x][y] = EL_BUG;
4082       MovDir[x][y] = direction[0][element - EL_BUG_RIGHT];
4083       break;
4084
4085     case EL_SPACESHIP_RIGHT:
4086     case EL_SPACESHIP_UP:
4087     case EL_SPACESHIP_LEFT:
4088     case EL_SPACESHIP_DOWN:
4089       Feld[x][y] = EL_SPACESHIP;
4090       MovDir[x][y] = direction[0][element - EL_SPACESHIP_RIGHT];
4091       break;
4092
4093     case EL_BD_BUTTERFLY_RIGHT:
4094     case EL_BD_BUTTERFLY_UP:
4095     case EL_BD_BUTTERFLY_LEFT:
4096     case EL_BD_BUTTERFLY_DOWN:
4097       Feld[x][y] = EL_BD_BUTTERFLY;
4098       MovDir[x][y] = direction[0][element - EL_BD_BUTTERFLY_RIGHT];
4099       break;
4100
4101     case EL_BD_FIREFLY_RIGHT:
4102     case EL_BD_FIREFLY_UP:
4103     case EL_BD_FIREFLY_LEFT:
4104     case EL_BD_FIREFLY_DOWN:
4105       Feld[x][y] = EL_BD_FIREFLY;
4106       MovDir[x][y] = direction[0][element - EL_BD_FIREFLY_RIGHT];
4107       break;
4108
4109     case EL_PACMAN_RIGHT:
4110     case EL_PACMAN_UP:
4111     case EL_PACMAN_LEFT:
4112     case EL_PACMAN_DOWN:
4113       Feld[x][y] = EL_PACMAN;
4114       MovDir[x][y] = direction[0][element - EL_PACMAN_RIGHT];
4115       break;
4116
4117     case EL_YAMYAM_LEFT:
4118     case EL_YAMYAM_RIGHT:
4119     case EL_YAMYAM_UP:
4120     case EL_YAMYAM_DOWN:
4121       Feld[x][y] = EL_YAMYAM;
4122       MovDir[x][y] = direction[2][element - EL_YAMYAM_LEFT];
4123       break;
4124
4125     case EL_SP_SNIKSNAK:
4126       MovDir[x][y] = MV_UP;
4127       break;
4128
4129     case EL_SP_ELECTRON:
4130       MovDir[x][y] = MV_LEFT;
4131       break;
4132
4133     case EL_MOLE_LEFT:
4134     case EL_MOLE_RIGHT:
4135     case EL_MOLE_UP:
4136     case EL_MOLE_DOWN:
4137       Feld[x][y] = EL_MOLE;
4138       MovDir[x][y] = direction[2][element - EL_MOLE_LEFT];
4139       break;
4140
4141     default:
4142       if (IS_CUSTOM_ELEMENT(element))
4143       {
4144         struct ElementInfo *ei = &element_info[element];
4145         int move_direction_initial = ei->move_direction_initial;
4146         int move_pattern = ei->move_pattern;
4147
4148         if (move_direction_initial == MV_START_PREVIOUS)
4149         {
4150           if (MovDir[x][y] != MV_NONE)
4151             return;
4152
4153           move_direction_initial = MV_START_AUTOMATIC;
4154         }
4155
4156         if (move_direction_initial == MV_START_RANDOM)
4157           MovDir[x][y] = 1 << RND(4);
4158         else if (move_direction_initial & MV_ANY_DIRECTION)
4159           MovDir[x][y] = move_direction_initial;
4160         else if (move_pattern == MV_ALL_DIRECTIONS ||
4161                  move_pattern == MV_TURNING_LEFT ||
4162                  move_pattern == MV_TURNING_RIGHT ||
4163                  move_pattern == MV_TURNING_LEFT_RIGHT ||
4164                  move_pattern == MV_TURNING_RIGHT_LEFT ||
4165                  move_pattern == MV_TURNING_RANDOM)
4166           MovDir[x][y] = 1 << RND(4);
4167         else if (move_pattern == MV_HORIZONTAL)
4168           MovDir[x][y] = (RND(2) ? MV_LEFT : MV_RIGHT);
4169         else if (move_pattern == MV_VERTICAL)
4170           MovDir[x][y] = (RND(2) ? MV_UP : MV_DOWN);
4171         else if (move_pattern & MV_ANY_DIRECTION)
4172           MovDir[x][y] = element_info[element].move_pattern;
4173         else if (move_pattern == MV_ALONG_LEFT_SIDE ||
4174                  move_pattern == MV_ALONG_RIGHT_SIDE)
4175         {
4176           /* use random direction as default start direction */
4177           if (game.engine_version >= VERSION_IDENT(3,1,0,0))
4178             MovDir[x][y] = 1 << RND(4);
4179
4180           for (i = 0; i < NUM_DIRECTIONS; i++)
4181           {
4182             int x1 = x + xy[i][0];
4183             int y1 = y + xy[i][1];
4184
4185             if (!IN_LEV_FIELD(x1, y1) || !IS_FREE(x1, y1))
4186             {
4187               if (move_pattern == MV_ALONG_RIGHT_SIDE)
4188                 MovDir[x][y] = direction[0][i];
4189               else
4190                 MovDir[x][y] = direction[1][i];
4191
4192               break;
4193             }
4194           }
4195         }
4196       }
4197       else
4198       {
4199         MovDir[x][y] = 1 << RND(4);
4200
4201         if (element != EL_BUG &&
4202             element != EL_SPACESHIP &&
4203             element != EL_BD_BUTTERFLY &&
4204             element != EL_BD_FIREFLY)
4205           break;
4206
4207         for (i = 0; i < NUM_DIRECTIONS; i++)
4208         {
4209           int x1 = x + xy[i][0];
4210           int y1 = y + xy[i][1];
4211
4212           if (!IN_LEV_FIELD(x1, y1) || !IS_FREE(x1, y1))
4213           {
4214             if (element == EL_BUG || element == EL_BD_BUTTERFLY)
4215             {
4216               MovDir[x][y] = direction[0][i];
4217               break;
4218             }
4219             else if (element == EL_SPACESHIP || element == EL_BD_FIREFLY ||
4220                      element == EL_SP_SNIKSNAK || element == EL_SP_ELECTRON)
4221             {
4222               MovDir[x][y] = direction[1][i];
4223               break;
4224             }
4225           }
4226         }
4227       }
4228       break;
4229   }
4230
4231   GfxDir[x][y] = MovDir[x][y];
4232 }
4233
4234 void InitAmoebaNr(int x, int y)
4235 {
4236   int i;
4237   int group_nr = AmoebeNachbarNr(x, y);
4238
4239   if (group_nr == 0)
4240   {
4241     for (i = 1; i < MAX_NUM_AMOEBA; i++)
4242     {
4243       if (AmoebaCnt[i] == 0)
4244       {
4245         group_nr = i;
4246         break;
4247       }
4248     }
4249   }
4250
4251   AmoebaNr[x][y] = group_nr;
4252   AmoebaCnt[group_nr]++;
4253   AmoebaCnt2[group_nr]++;
4254 }
4255
4256 static void PlayerWins(struct PlayerInfo *player)
4257 {
4258   player->LevelSolved = TRUE;
4259   player->GameOver = TRUE;
4260
4261   player->score_final = (level.game_engine_type == GAME_ENGINE_TYPE_EM ?
4262                          level.native_em_level->lev->score : player->score);
4263
4264   player->LevelSolved_CountingTime = (game.no_time_limit ? TimePlayed :
4265                                       TimeLeft);
4266   player->LevelSolved_CountingScore = player->score_final;
4267 }
4268
4269 void GameWon()
4270 {
4271   static int time, time_final;
4272   static int score, score_final;
4273   static int game_over_delay_1 = 0;
4274   static int game_over_delay_2 = 0;
4275   int game_over_delay_value_1 = 50;
4276   int game_over_delay_value_2 = 50;
4277
4278   if (!local_player->LevelSolved_GameWon)
4279   {
4280     int i;
4281
4282     /* do not start end game actions before the player stops moving (to exit) */
4283     if (local_player->MovPos)
4284       return;
4285
4286     local_player->LevelSolved_GameWon = TRUE;
4287     local_player->LevelSolved_SaveTape = tape.recording;
4288     local_player->LevelSolved_SaveScore = !tape.playing;
4289
4290     if (!tape.playing)
4291     {
4292       LevelStats_incSolved(level_nr);
4293
4294       SaveLevelSetup_SeriesInfo();
4295     }
4296
4297     if (tape.auto_play)         /* tape might already be stopped here */
4298       tape.auto_play_level_solved = TRUE;
4299
4300     TapeStop();
4301
4302     game_over_delay_1 = game_over_delay_value_1;
4303     game_over_delay_2 = game_over_delay_value_2;
4304
4305     time = time_final = (game.no_time_limit ? TimePlayed : TimeLeft);
4306     score = score_final = local_player->score_final;
4307
4308     if (TimeLeft > 0)
4309     {
4310       time_final = 0;
4311       score_final += TimeLeft * level.score[SC_TIME_BONUS];
4312     }
4313     else if (game.no_time_limit && TimePlayed < 999)
4314     {
4315       time_final = 999;
4316       score_final += (999 - TimePlayed) * level.score[SC_TIME_BONUS];
4317     }
4318
4319     local_player->score_final = score_final;
4320
4321     if (level_editor_test_game)
4322     {
4323       time = time_final;
4324       score = score_final;
4325
4326       local_player->LevelSolved_CountingTime = time;
4327       local_player->LevelSolved_CountingScore = score;
4328
4329       game_panel_controls[GAME_PANEL_TIME].value = time;
4330       game_panel_controls[GAME_PANEL_SCORE].value = score;
4331
4332       DisplayGameControlValues();
4333     }
4334
4335     if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
4336     {
4337       if (ExitX >= 0 && ExitY >= 0)     /* local player has left the level */
4338       {
4339         /* close exit door after last player */
4340         if ((AllPlayersGone &&
4341              (Feld[ExitX][ExitY] == EL_EXIT_OPEN ||
4342               Feld[ExitX][ExitY] == EL_SP_EXIT_OPEN ||
4343               Feld[ExitX][ExitY] == EL_STEEL_EXIT_OPEN)) ||
4344             Feld[ExitX][ExitY] == EL_EM_EXIT_OPEN ||
4345             Feld[ExitX][ExitY] == EL_EM_STEEL_EXIT_OPEN)
4346         {
4347           int element = Feld[ExitX][ExitY];
4348
4349           Feld[ExitX][ExitY] =
4350             (element == EL_EXIT_OPEN            ? EL_EXIT_CLOSING :
4351              element == EL_EM_EXIT_OPEN ? EL_EM_EXIT_CLOSING :
4352              element == EL_SP_EXIT_OPEN ? EL_SP_EXIT_CLOSING:
4353              element == EL_STEEL_EXIT_OPEN      ? EL_STEEL_EXIT_CLOSING:
4354              EL_EM_STEEL_EXIT_CLOSING);
4355
4356           PlayLevelSoundElementAction(ExitX, ExitY, element, ACTION_CLOSING);
4357         }
4358
4359         /* player disappears */
4360         DrawLevelField(ExitX, ExitY);
4361       }
4362
4363       for (i = 0; i < MAX_PLAYERS; i++)
4364       {
4365         struct PlayerInfo *player = &stored_player[i];
4366
4367         if (player->present)
4368         {
4369           RemovePlayer(player);
4370
4371           /* player disappears */
4372           DrawLevelField(player->jx, player->jy);
4373         }
4374       }
4375     }
4376
4377     PlaySound(SND_GAME_WINNING);
4378   }
4379
4380   if (game_over_delay_1 > 0)
4381   {
4382     game_over_delay_1--;
4383
4384     return;
4385   }
4386
4387   if (time != time_final)
4388   {
4389     int time_to_go = ABS(time_final - time);
4390     int time_count_dir = (time < time_final ? +1 : -1);
4391     int time_count_steps = (time_to_go > 100 && time_to_go % 10 == 0 ? 10 : 1);
4392
4393     time  += time_count_steps * time_count_dir;
4394     score += time_count_steps * level.score[SC_TIME_BONUS];
4395
4396     local_player->LevelSolved_CountingTime = time;
4397     local_player->LevelSolved_CountingScore = score;
4398
4399     game_panel_controls[GAME_PANEL_TIME].value = time;
4400     game_panel_controls[GAME_PANEL_SCORE].value = score;
4401
4402     DisplayGameControlValues();
4403
4404     if (time == time_final)
4405       StopSound(SND_GAME_LEVELTIME_BONUS);
4406     else if (setup.sound_loops)
4407       PlaySoundLoop(SND_GAME_LEVELTIME_BONUS);
4408     else
4409       PlaySound(SND_GAME_LEVELTIME_BONUS);
4410
4411     return;
4412   }
4413
4414   local_player->LevelSolved_PanelOff = TRUE;
4415
4416   if (game_over_delay_2 > 0)
4417   {
4418     game_over_delay_2--;
4419
4420     return;
4421   }
4422
4423   GameEnd();
4424 }
4425
4426 void GameEnd()
4427 {
4428   int hi_pos;
4429   boolean raise_level = FALSE;
4430
4431   local_player->LevelSolved_GameEnd = TRUE;
4432
4433   if (!global.use_envelope_request)
4434     CloseDoor(DOOR_CLOSE_1);
4435
4436   if (local_player->LevelSolved_SaveTape)
4437   {
4438     SaveTapeChecked(tape.level_nr);     /* ask to save tape */
4439   }
4440
4441   CloseDoor(DOOR_CLOSE_ALL);
4442
4443   if (level_editor_test_game)
4444   {
4445     SetGameStatus(GAME_MODE_MAIN);
4446
4447     DrawMainMenu();
4448
4449     return;
4450   }
4451
4452   if (!local_player->LevelSolved_SaveScore)
4453   {
4454     SetGameStatus(GAME_MODE_MAIN);
4455
4456     DrawMainMenu();
4457
4458     return;
4459   }
4460
4461   if (level_nr == leveldir_current->handicap_level)
4462   {
4463     leveldir_current->handicap_level++;
4464
4465     SaveLevelSetup_SeriesInfo();
4466   }
4467
4468   if (setup.increment_levels &&
4469       level_nr < leveldir_current->last_level)
4470     raise_level = TRUE;                 /* advance to next level */
4471
4472   if ((hi_pos = NewHiScore()) >= 0)
4473   {
4474     SetGameStatus(GAME_MODE_SCORES);
4475
4476     DrawHallOfFame(hi_pos);
4477
4478     if (raise_level)
4479     {
4480       level_nr++;
4481       TapeErase();
4482     }
4483   }
4484   else
4485   {
4486     SetGameStatus(GAME_MODE_MAIN);
4487
4488     if (raise_level)
4489     {
4490       level_nr++;
4491       TapeErase();
4492     }
4493
4494     DrawMainMenu();
4495   }
4496 }
4497
4498 int NewHiScore()
4499 {
4500   int k, l;
4501   int position = -1;
4502   boolean one_score_entry_per_name = !program.many_scores_per_name;
4503
4504   LoadScore(level_nr);
4505
4506   if (strEqual(setup.player_name, EMPTY_PLAYER_NAME) ||
4507       local_player->score_final < highscore[MAX_SCORE_ENTRIES - 1].Score)
4508     return -1;
4509
4510   for (k = 0; k < MAX_SCORE_ENTRIES; k++)
4511   {
4512     if (local_player->score_final > highscore[k].Score)
4513     {
4514       /* player has made it to the hall of fame */
4515
4516       if (k < MAX_SCORE_ENTRIES - 1)
4517       {
4518         int m = MAX_SCORE_ENTRIES - 1;
4519
4520         if (one_score_entry_per_name)
4521         {
4522           for (l = k; l < MAX_SCORE_ENTRIES; l++)
4523             if (strEqual(setup.player_name, highscore[l].Name))
4524               m = l;
4525
4526           if (m == k)   /* player's new highscore overwrites his old one */
4527             goto put_into_list;
4528         }
4529
4530         for (l = m; l > k; l--)
4531         {
4532           strcpy(highscore[l].Name, highscore[l - 1].Name);
4533           highscore[l].Score = highscore[l - 1].Score;
4534         }
4535       }
4536
4537       put_into_list:
4538
4539       strncpy(highscore[k].Name, setup.player_name, MAX_PLAYER_NAME_LEN);
4540       highscore[k].Name[MAX_PLAYER_NAME_LEN] = '\0';
4541       highscore[k].Score = local_player->score_final;
4542       position = k;
4543
4544       break;
4545     }
4546     else if (one_score_entry_per_name &&
4547              !strncmp(setup.player_name, highscore[k].Name,
4548                       MAX_PLAYER_NAME_LEN))
4549       break;    /* player already there with a higher score */
4550   }
4551
4552   if (position >= 0)
4553     SaveScore(level_nr);
4554
4555   return position;
4556 }
4557
4558 inline static int getElementMoveStepsizeExt(int x, int y, int direction)
4559 {
4560   int element = Feld[x][y];
4561   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
4562   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
4563   int horiz_move = (dx != 0);
4564   int sign = (horiz_move ? dx : dy);
4565   int step = sign * element_info[element].move_stepsize;
4566
4567   /* special values for move stepsize for spring and things on conveyor belt */
4568   if (horiz_move)
4569   {
4570     if (CAN_FALL(element) &&
4571         y < lev_fieldy - 1 && IS_BELT_ACTIVE(Feld[x][y + 1]))
4572       step = sign * MOVE_STEPSIZE_NORMAL / 2;
4573     else if (element == EL_SPRING)
4574       step = sign * MOVE_STEPSIZE_NORMAL * 2;
4575   }
4576
4577   return step;
4578 }
4579
4580 inline static int getElementMoveStepsize(int x, int y)
4581 {
4582   return getElementMoveStepsizeExt(x, y, MovDir[x][y]);
4583 }
4584
4585 void InitPlayerGfxAnimation(struct PlayerInfo *player, int action, int dir)
4586 {
4587   if (player->GfxAction != action || player->GfxDir != dir)
4588   {
4589     player->GfxAction = action;
4590     player->GfxDir = dir;
4591     player->Frame = 0;
4592     player->StepFrame = 0;
4593   }
4594 }
4595
4596 static void ResetGfxFrame(int x, int y)
4597 {
4598   int element = Feld[x][y];
4599   int graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
4600
4601   if (graphic_info[graphic].anim_global_sync)
4602     GfxFrame[x][y] = FrameCounter;
4603   else if (ANIM_MODE(graphic) == ANIM_CE_VALUE)
4604     GfxFrame[x][y] = CustomValue[x][y];
4605   else if (ANIM_MODE(graphic) == ANIM_CE_SCORE)
4606     GfxFrame[x][y] = element_info[element].collect_score;
4607   else if (ANIM_MODE(graphic) == ANIM_CE_DELAY)
4608     GfxFrame[x][y] = ChangeDelay[x][y];
4609 }
4610
4611 static void ResetGfxAnimation(int x, int y)
4612 {
4613   GfxAction[x][y] = ACTION_DEFAULT;
4614   GfxDir[x][y] = MovDir[x][y];
4615   GfxFrame[x][y] = 0;
4616
4617   ResetGfxFrame(x, y);
4618 }
4619
4620 static void ResetRandomAnimationValue(int x, int y)
4621 {
4622   GfxRandom[x][y] = INIT_GFX_RANDOM();
4623 }
4624
4625 void InitMovingField(int x, int y, int direction)
4626 {
4627   int element = Feld[x][y];
4628   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
4629   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
4630   int newx = x + dx;
4631   int newy = y + dy;
4632   boolean is_moving_before, is_moving_after;
4633
4634   /* check if element was/is moving or being moved before/after mode change */
4635   is_moving_before = (WasJustMoving[x][y] != 0);
4636   is_moving_after  = (getElementMoveStepsizeExt(x, y, direction)    != 0);
4637
4638   /* reset animation only for moving elements which change direction of moving
4639      or which just started or stopped moving
4640      (else CEs with property "can move" / "not moving" are reset each frame) */
4641   if (is_moving_before != is_moving_after ||
4642       direction != MovDir[x][y])
4643     ResetGfxAnimation(x, y);
4644
4645   MovDir[x][y] = direction;
4646   GfxDir[x][y] = direction;
4647
4648   GfxAction[x][y] = (!is_moving_after ? ACTION_WAITING :
4649                      direction == MV_DOWN && CAN_FALL(element) ?
4650                      ACTION_FALLING : ACTION_MOVING);
4651
4652   /* this is needed for CEs with property "can move" / "not moving" */
4653
4654   if (is_moving_after)
4655   {
4656     if (Feld[newx][newy] == EL_EMPTY)
4657       Feld[newx][newy] = EL_BLOCKED;
4658
4659     MovDir[newx][newy] = MovDir[x][y];
4660
4661     CustomValue[newx][newy] = CustomValue[x][y];
4662
4663     GfxFrame[newx][newy] = GfxFrame[x][y];
4664     GfxRandom[newx][newy] = GfxRandom[x][y];
4665     GfxAction[newx][newy] = GfxAction[x][y];
4666     GfxDir[newx][newy] = GfxDir[x][y];
4667   }
4668 }
4669
4670 void Moving2Blocked(int x, int y, int *goes_to_x, int *goes_to_y)
4671 {
4672   int direction = MovDir[x][y];
4673   int newx = x + (direction & MV_LEFT ? -1 : direction & MV_RIGHT ? +1 : 0);
4674   int newy = y + (direction & MV_UP   ? -1 : direction & MV_DOWN  ? +1 : 0);
4675
4676   *goes_to_x = newx;
4677   *goes_to_y = newy;
4678 }
4679
4680 void Blocked2Moving(int x, int y, int *comes_from_x, int *comes_from_y)
4681 {
4682   int oldx = x, oldy = y;
4683   int direction = MovDir[x][y];
4684
4685   if (direction == MV_LEFT)
4686     oldx++;
4687   else if (direction == MV_RIGHT)
4688     oldx--;
4689   else if (direction == MV_UP)
4690     oldy++;
4691   else if (direction == MV_DOWN)
4692     oldy--;
4693
4694   *comes_from_x = oldx;
4695   *comes_from_y = oldy;
4696 }
4697
4698 int MovingOrBlocked2Element(int x, int y)
4699 {
4700   int element = Feld[x][y];
4701
4702   if (element == EL_BLOCKED)
4703   {
4704     int oldx, oldy;
4705
4706     Blocked2Moving(x, y, &oldx, &oldy);
4707     return Feld[oldx][oldy];
4708   }
4709   else
4710     return element;
4711 }
4712
4713 static int MovingOrBlocked2ElementIfNotLeaving(int x, int y)
4714 {
4715   /* like MovingOrBlocked2Element(), but if element is moving
4716      and (x,y) is the field the moving element is just leaving,
4717      return EL_BLOCKED instead of the element value */
4718   int element = Feld[x][y];
4719
4720   if (IS_MOVING(x, y))
4721   {
4722     if (element == EL_BLOCKED)
4723     {
4724       int oldx, oldy;
4725
4726       Blocked2Moving(x, y, &oldx, &oldy);
4727       return Feld[oldx][oldy];
4728     }
4729     else
4730       return EL_BLOCKED;
4731   }
4732   else
4733     return element;
4734 }
4735
4736 static void RemoveField(int x, int y)
4737 {
4738   Feld[x][y] = EL_EMPTY;
4739
4740   MovPos[x][y] = 0;
4741   MovDir[x][y] = 0;
4742   MovDelay[x][y] = 0;
4743
4744   CustomValue[x][y] = 0;
4745
4746   AmoebaNr[x][y] = 0;
4747   ChangeDelay[x][y] = 0;
4748   ChangePage[x][y] = -1;
4749   Pushed[x][y] = FALSE;
4750
4751   GfxElement[x][y] = EL_UNDEFINED;
4752   GfxAction[x][y] = ACTION_DEFAULT;
4753   GfxDir[x][y] = MV_NONE;
4754 }
4755
4756 void RemoveMovingField(int x, int y)
4757 {
4758   int oldx = x, oldy = y, newx = x, newy = y;
4759   int element = Feld[x][y];
4760   int next_element = EL_UNDEFINED;
4761
4762   if (element != EL_BLOCKED && !IS_MOVING(x, y))
4763     return;
4764
4765   if (IS_MOVING(x, y))
4766   {
4767     Moving2Blocked(x, y, &newx, &newy);
4768
4769     if (Feld[newx][newy] != EL_BLOCKED)
4770     {
4771       /* element is moving, but target field is not free (blocked), but
4772          already occupied by something different (example: acid pool);
4773          in this case, only remove the moving field, but not the target */
4774
4775       RemoveField(oldx, oldy);
4776
4777       Store[oldx][oldy] = Store2[oldx][oldy] = 0;
4778
4779       TEST_DrawLevelField(oldx, oldy);
4780
4781       return;
4782     }
4783   }
4784   else if (element == EL_BLOCKED)
4785   {
4786     Blocked2Moving(x, y, &oldx, &oldy);
4787     if (!IS_MOVING(oldx, oldy))
4788       return;
4789   }
4790
4791   if (element == EL_BLOCKED &&
4792       (Feld[oldx][oldy] == EL_QUICKSAND_EMPTYING ||
4793        Feld[oldx][oldy] == EL_QUICKSAND_FAST_EMPTYING ||
4794        Feld[oldx][oldy] == EL_MAGIC_WALL_EMPTYING ||
4795        Feld[oldx][oldy] == EL_BD_MAGIC_WALL_EMPTYING ||
4796        Feld[oldx][oldy] == EL_DC_MAGIC_WALL_EMPTYING ||
4797        Feld[oldx][oldy] == EL_AMOEBA_DROPPING))
4798     next_element = get_next_element(Feld[oldx][oldy]);
4799
4800   RemoveField(oldx, oldy);
4801   RemoveField(newx, newy);
4802
4803   Store[oldx][oldy] = Store2[oldx][oldy] = 0;
4804
4805   if (next_element != EL_UNDEFINED)
4806     Feld[oldx][oldy] = next_element;
4807
4808   TEST_DrawLevelField(oldx, oldy);
4809   TEST_DrawLevelField(newx, newy);
4810 }
4811
4812 void DrawDynamite(int x, int y)
4813 {
4814   int sx = SCREENX(x), sy = SCREENY(y);
4815   int graphic = el2img(Feld[x][y]);
4816   int frame;
4817
4818   if (!IN_SCR_FIELD(sx, sy) || IS_PLAYER(x, y))
4819     return;
4820
4821   if (IS_WALKABLE_INSIDE(Back[x][y]))
4822     return;
4823
4824   if (Back[x][y])
4825     DrawGraphic(sx, sy, el2img(Back[x][y]), 0);
4826   else if (Store[x][y])
4827     DrawGraphic(sx, sy, el2img(Store[x][y]), 0);
4828
4829   frame = getGraphicAnimationFrame(graphic, GfxFrame[x][y]);
4830
4831   if (Back[x][y] || Store[x][y])
4832     DrawGraphicThruMask(sx, sy, graphic, frame);
4833   else
4834     DrawGraphic(sx, sy, graphic, frame);
4835 }
4836
4837 void CheckDynamite(int x, int y)
4838 {
4839   if (MovDelay[x][y] != 0)      /* dynamite is still waiting to explode */
4840   {
4841     MovDelay[x][y]--;
4842
4843     if (MovDelay[x][y] != 0)
4844     {
4845       DrawDynamite(x, y);
4846       PlayLevelSoundActionIfLoop(x, y, ACTION_ACTIVE);
4847
4848       return;
4849     }
4850   }
4851
4852   StopLevelSoundActionIfLoop(x, y, ACTION_ACTIVE);
4853
4854   Bang(x, y);
4855 }
4856
4857 static void setMinimalPlayerBoundaries(int *sx1, int *sy1, int *sx2, int *sy2)
4858 {
4859   boolean num_checked_players = 0;
4860   int i;
4861
4862   for (i = 0; i < MAX_PLAYERS; i++)
4863   {
4864     if (stored_player[i].active)
4865     {
4866       int sx = stored_player[i].jx;
4867       int sy = stored_player[i].jy;
4868
4869       if (num_checked_players == 0)
4870       {
4871         *sx1 = *sx2 = sx;
4872         *sy1 = *sy2 = sy;
4873       }
4874       else
4875       {
4876         *sx1 = MIN(*sx1, sx);
4877         *sy1 = MIN(*sy1, sy);
4878         *sx2 = MAX(*sx2, sx);
4879         *sy2 = MAX(*sy2, sy);
4880       }
4881
4882       num_checked_players++;
4883     }
4884   }
4885 }
4886
4887 static boolean checkIfAllPlayersFitToScreen_RND()
4888 {
4889   int sx1 = 0, sy1 = 0, sx2 = 0, sy2 = 0;
4890
4891   setMinimalPlayerBoundaries(&sx1, &sy1, &sx2, &sy2);
4892
4893   return (sx2 - sx1 < SCR_FIELDX &&
4894           sy2 - sy1 < SCR_FIELDY);
4895 }
4896
4897 static void setScreenCenteredToAllPlayers(int *sx, int *sy)
4898 {
4899   int sx1 = scroll_x, sy1 = scroll_y, sx2 = scroll_x, sy2 = scroll_y;
4900
4901   setMinimalPlayerBoundaries(&sx1, &sy1, &sx2, &sy2);
4902
4903   *sx = (sx1 + sx2) / 2;
4904   *sy = (sy1 + sy2) / 2;
4905 }
4906
4907 void DrawRelocateScreen(int old_x, int old_y, int x, int y, int move_dir,
4908                         boolean center_screen, boolean quick_relocation)
4909 {
4910   unsigned int frame_delay_value_old = GetVideoFrameDelay();
4911   boolean ffwd_delay = (tape.playing && tape.fast_forward);
4912   boolean no_delay = (tape.warp_forward);
4913   int frame_delay_value = (ffwd_delay ? FfwdFrameDelay : GameFrameDelay);
4914   int wait_delay_value = (no_delay ? 0 : frame_delay_value);
4915   int new_scroll_x, new_scroll_y;
4916
4917   if (level.lazy_relocation && IN_VIS_FIELD(SCREENX(x), SCREENY(y)))
4918   {
4919     /* case 1: quick relocation inside visible screen (without scrolling) */
4920
4921     RedrawPlayfield();
4922
4923     return;
4924   }
4925
4926   if (!level.shifted_relocation || center_screen)
4927   {
4928     /* relocation _with_ centering of screen */
4929
4930     new_scroll_x = SCROLL_POSITION_X(x);
4931     new_scroll_y = SCROLL_POSITION_Y(y);
4932   }
4933   else
4934   {
4935     /* relocation _without_ centering of screen */
4936
4937     int center_scroll_x = SCROLL_POSITION_X(old_x);
4938     int center_scroll_y = SCROLL_POSITION_Y(old_y);
4939     int offset_x = x + (scroll_x - center_scroll_x);
4940     int offset_y = y + (scroll_y - center_scroll_y);
4941
4942     /* for new screen position, apply previous offset to center position */
4943     new_scroll_x = SCROLL_POSITION_X(offset_x);
4944     new_scroll_y = SCROLL_POSITION_Y(offset_y);
4945   }
4946
4947   if (quick_relocation)
4948   {
4949     /* case 2: quick relocation (redraw without visible scrolling) */
4950
4951     scroll_x = new_scroll_x;
4952     scroll_y = new_scroll_y;
4953
4954     RedrawPlayfield();
4955
4956     return;
4957   }
4958
4959   /* case 3: visible relocation (with scrolling to new position) */
4960
4961   ScrollScreen(NULL, SCROLL_GO_ON);     /* scroll last frame to full tile */
4962
4963   SetVideoFrameDelay(wait_delay_value);
4964
4965   while (scroll_x != new_scroll_x || scroll_y != new_scroll_y)
4966   {
4967     int dx = 0, dy = 0;
4968     int fx = FX, fy = FY;
4969
4970     dx = (new_scroll_x < scroll_x ? +1 : new_scroll_x > scroll_x ? -1 : 0);
4971     dy = (new_scroll_y < scroll_y ? +1 : new_scroll_y > scroll_y ? -1 : 0);
4972
4973     if (dx == 0 && dy == 0)             /* no scrolling needed at all */
4974       break;
4975
4976     scroll_x -= dx;
4977     scroll_y -= dy;
4978
4979     fx += dx * TILEX / 2;
4980     fy += dy * TILEY / 2;
4981
4982     ScrollLevel(dx, dy);
4983     DrawAllPlayers();
4984
4985     /* scroll in two steps of half tile size to make things smoother */
4986     BlitBitmap(drawto_field, window, fx, fy, SXSIZE, SYSIZE, SX, SY);
4987
4988     /* scroll second step to align at full tile size */
4989     BlitScreenToBitmap(window);
4990   }
4991
4992   DrawAllPlayers();
4993   BackToFront();
4994
4995   SetVideoFrameDelay(frame_delay_value_old);
4996 }
4997
4998 void RelocatePlayer(int jx, int jy, int el_player_raw)
4999 {
5000   int el_player = GET_PLAYER_ELEMENT(el_player_raw);
5001   int player_nr = GET_PLAYER_NR(el_player);
5002   struct PlayerInfo *player = &stored_player[player_nr];
5003   boolean ffwd_delay = (tape.playing && tape.fast_forward);
5004   boolean no_delay = (tape.warp_forward);
5005   int frame_delay_value = (ffwd_delay ? FfwdFrameDelay : GameFrameDelay);
5006   int wait_delay_value = (no_delay ? 0 : frame_delay_value);
5007   int old_jx = player->jx;
5008   int old_jy = player->jy;
5009   int old_element = Feld[old_jx][old_jy];
5010   int element = Feld[jx][jy];
5011   boolean player_relocated = (old_jx != jx || old_jy != jy);
5012
5013   int move_dir_horiz = (jx < old_jx ? MV_LEFT : jx > old_jx ? MV_RIGHT : 0);
5014   int move_dir_vert  = (jy < old_jy ? MV_UP   : jy > old_jy ? MV_DOWN  : 0);
5015   int enter_side_horiz = MV_DIR_OPPOSITE(move_dir_horiz);
5016   int enter_side_vert  = MV_DIR_OPPOSITE(move_dir_vert);
5017   int leave_side_horiz = move_dir_horiz;
5018   int leave_side_vert  = move_dir_vert;
5019   int enter_side = enter_side_horiz | enter_side_vert;
5020   int leave_side = leave_side_horiz | leave_side_vert;
5021
5022   if (player->GameOver)         /* do not reanimate dead player */
5023     return;
5024
5025   if (!player_relocated)        /* no need to relocate the player */
5026     return;
5027
5028   if (IS_PLAYER(jx, jy))        /* player already placed at new position */
5029   {
5030     RemoveField(jx, jy);        /* temporarily remove newly placed player */
5031     DrawLevelField(jx, jy);
5032   }
5033
5034   if (player->present)
5035   {
5036     while (player->MovPos)
5037     {
5038       ScrollPlayer(player, SCROLL_GO_ON);
5039       ScrollScreen(NULL, SCROLL_GO_ON);
5040
5041       AdvanceFrameAndPlayerCounters(player->index_nr);
5042
5043       DrawPlayer(player);
5044
5045       BackToFront_WithFrameDelay(wait_delay_value);
5046     }
5047
5048     DrawPlayer(player);         /* needed here only to cleanup last field */
5049     DrawLevelField(player->jx, player->jy);     /* remove player graphic */
5050
5051     player->is_moving = FALSE;
5052   }
5053
5054   if (IS_CUSTOM_ELEMENT(old_element))
5055     CheckElementChangeByPlayer(old_jx, old_jy, old_element,
5056                                CE_LEFT_BY_PLAYER,
5057                                player->index_bit, leave_side);
5058
5059   CheckTriggeredElementChangeByPlayer(old_jx, old_jy, old_element,
5060                                       CE_PLAYER_LEAVES_X,
5061                                       player->index_bit, leave_side);
5062
5063   Feld[jx][jy] = el_player;
5064   InitPlayerField(jx, jy, el_player, TRUE);
5065
5066   /* "InitPlayerField()" above sets Feld[jx][jy] to EL_EMPTY, but it may be
5067      possible that the relocation target field did not contain a player element,
5068      but a walkable element, to which the new player was relocated -- in this
5069      case, restore that (already initialized!) element on the player field */
5070   if (!ELEM_IS_PLAYER(element)) /* player may be set on walkable element */
5071   {
5072     Feld[jx][jy] = element;     /* restore previously existing element */
5073   }
5074
5075   /* only visually relocate centered player */
5076   DrawRelocateScreen(old_jx, old_jy, player->jx, player->jy, player->MovDir,
5077                      FALSE, level.instant_relocation);
5078
5079   TestIfPlayerTouchesBadThing(jx, jy);
5080   TestIfPlayerTouchesCustomElement(jx, jy);
5081
5082   if (IS_CUSTOM_ELEMENT(element))
5083     CheckElementChangeByPlayer(jx, jy, element, CE_ENTERED_BY_PLAYER,
5084                                player->index_bit, enter_side);
5085
5086   CheckTriggeredElementChangeByPlayer(jx, jy, element, CE_PLAYER_ENTERS_X,
5087                                       player->index_bit, enter_side);
5088
5089   if (player->is_switching)
5090   {
5091     /* ensure that relocation while still switching an element does not cause
5092        a new element to be treated as also switched directly after relocation
5093        (this is important for teleporter switches that teleport the player to
5094        a place where another teleporter switch is in the same direction, which
5095        would then incorrectly be treated as immediately switched before the
5096        direction key that caused the switch was released) */
5097
5098     player->switch_x += jx - old_jx;
5099     player->switch_y += jy - old_jy;
5100   }
5101 }
5102
5103 void Explode(int ex, int ey, int phase, int mode)
5104 {
5105   int x, y;
5106   int last_phase;
5107   int border_element;
5108
5109   /* !!! eliminate this variable !!! */
5110   int delay = (game.emulation == EMU_SUPAPLEX ? 3 : 2);
5111
5112   if (game.explosions_delayed)
5113   {
5114     ExplodeField[ex][ey] = mode;
5115     return;
5116   }
5117
5118   if (phase == EX_PHASE_START)          /* initialize 'Store[][]' field */
5119   {
5120     int center_element = Feld[ex][ey];
5121     int artwork_element, explosion_element;     /* set these values later */
5122
5123     /* remove things displayed in background while burning dynamite */
5124     if (Back[ex][ey] != EL_EMPTY && !IS_INDESTRUCTIBLE(Back[ex][ey]))
5125       Back[ex][ey] = 0;
5126
5127     if (IS_MOVING(ex, ey) || IS_BLOCKED(ex, ey))
5128     {
5129       /* put moving element to center field (and let it explode there) */
5130       center_element = MovingOrBlocked2Element(ex, ey);
5131       RemoveMovingField(ex, ey);
5132       Feld[ex][ey] = center_element;
5133     }
5134
5135     /* now "center_element" is finally determined -- set related values now */
5136     artwork_element = center_element;           /* for custom player artwork */
5137     explosion_element = center_element;         /* for custom player artwork */
5138
5139     if (IS_PLAYER(ex, ey))
5140     {
5141       int player_nr = GET_PLAYER_NR(StorePlayer[ex][ey]);
5142
5143       artwork_element = stored_player[player_nr].artwork_element;
5144
5145       if (level.use_explosion_element[player_nr])
5146       {
5147         explosion_element = level.explosion_element[player_nr];
5148         artwork_element = explosion_element;
5149       }
5150     }
5151
5152     if (mode == EX_TYPE_NORMAL ||
5153         mode == EX_TYPE_CENTER ||
5154         mode == EX_TYPE_CROSS)
5155       PlayLevelSoundElementAction(ex, ey, artwork_element, ACTION_EXPLODING);
5156
5157     last_phase = element_info[explosion_element].explosion_delay + 1;
5158
5159     for (y = ey - 1; y <= ey + 1; y++) for (x = ex - 1; x <= ex + 1; x++)
5160     {
5161       int xx = x - ex + 1;
5162       int yy = y - ey + 1;
5163       int element;
5164
5165       if (!IN_LEV_FIELD(x, y) ||
5166           (mode & EX_TYPE_SINGLE_TILE && (x != ex || y != ey)) ||
5167           (mode == EX_TYPE_CROSS      && (x != ex && y != ey)))
5168         continue;
5169
5170       element = Feld[x][y];
5171
5172       if (IS_MOVING(x, y) || IS_BLOCKED(x, y))
5173       {
5174         element = MovingOrBlocked2Element(x, y);
5175
5176         if (!IS_EXPLOSION_PROOF(element))
5177           RemoveMovingField(x, y);
5178       }
5179
5180       /* indestructible elements can only explode in center (but not flames) */
5181       if ((IS_EXPLOSION_PROOF(element) && (x != ex || y != ey ||
5182                                            mode == EX_TYPE_BORDER)) ||
5183           element == EL_FLAMES)
5184         continue;
5185
5186       /* no idea why this was changed from 3.0.8 to 3.1.0 -- this causes buggy
5187          behaviour, for example when touching a yamyam that explodes to rocks
5188          with active deadly shield, a rock is created under the player !!! */
5189       /* (case 1 (surely buggy): >= 3.1.0, case 2 (maybe buggy): <= 3.0.8) */
5190 #if 0
5191       if (IS_PLAYER(x, y) && SHIELD_ON(PLAYERINFO(x, y)) &&
5192           (game.engine_version < VERSION_IDENT(3,1,0,0) ||
5193            (x == ex && y == ey && mode != EX_TYPE_BORDER)))
5194 #else
5195       if (IS_PLAYER(x, y) && SHIELD_ON(PLAYERINFO(x, y)))
5196 #endif
5197       {
5198         if (IS_ACTIVE_BOMB(element))
5199         {
5200           /* re-activate things under the bomb like gate or penguin */
5201           Feld[x][y] = (Back[x][y] ? Back[x][y] : EL_EMPTY);
5202           Back[x][y] = 0;
5203         }
5204
5205         continue;
5206       }
5207
5208       /* save walkable background elements while explosion on same tile */
5209       if (IS_WALKABLE(element) && IS_INDESTRUCTIBLE(element) &&
5210           (x != ex || y != ey || mode == EX_TYPE_BORDER))
5211         Back[x][y] = element;
5212
5213       /* ignite explodable elements reached by other explosion */
5214       if (element == EL_EXPLOSION)
5215         element = Store2[x][y];
5216
5217       if (AmoebaNr[x][y] &&
5218           (element == EL_AMOEBA_FULL ||
5219            element == EL_BD_AMOEBA ||
5220            element == EL_AMOEBA_GROWING))
5221       {
5222         AmoebaCnt[AmoebaNr[x][y]]--;
5223         AmoebaCnt2[AmoebaNr[x][y]]--;
5224       }
5225
5226       RemoveField(x, y);
5227
5228       if (IS_PLAYER(ex, ey) && !PLAYER_EXPLOSION_PROTECTED(ex, ey))
5229       {
5230         int player_nr = StorePlayer[ex][ey] - EL_PLAYER_1;
5231
5232         Store[x][y] = EL_PLAYER_IS_EXPLODING_1 + player_nr;
5233
5234         if (PLAYERINFO(ex, ey)->use_murphy)
5235           Store[x][y] = EL_EMPTY;
5236       }
5237
5238       /* !!! check this case -- currently needed for rnd_rado_negundo_v,
5239          !!! levels 015 018 019 020 021 022 023 026 027 028 !!! */
5240       else if (ELEM_IS_PLAYER(center_element))
5241         Store[x][y] = EL_EMPTY;
5242       else if (center_element == EL_YAMYAM)
5243         Store[x][y] = level.yamyam_content[game.yamyam_content_nr].e[xx][yy];
5244       else if (element_info[center_element].content.e[xx][yy] != EL_EMPTY)
5245         Store[x][y] = element_info[center_element].content.e[xx][yy];
5246 #if 1
5247       /* needed because EL_BD_BUTTERFLY is not defined as "CAN_EXPLODE"
5248          (killing EL_BD_BUTTERFLY with dynamite would result in BD diamond
5249          otherwise) -- FIX THIS !!! */
5250       else if (!CAN_EXPLODE(element) && element != EL_BD_BUTTERFLY)
5251         Store[x][y] = element_info[element].content.e[1][1];
5252 #else
5253       else if (!CAN_EXPLODE(element))
5254         Store[x][y] = element_info[element].content.e[1][1];
5255 #endif
5256       else
5257         Store[x][y] = EL_EMPTY;
5258
5259       if (x != ex || y != ey || mode == EX_TYPE_BORDER ||
5260           center_element == EL_AMOEBA_TO_DIAMOND)
5261         Store2[x][y] = element;
5262
5263       Feld[x][y] = EL_EXPLOSION;
5264       GfxElement[x][y] = artwork_element;
5265
5266       ExplodePhase[x][y] = 1;
5267       ExplodeDelay[x][y] = last_phase;
5268
5269       Stop[x][y] = TRUE;
5270     }
5271
5272     if (center_element == EL_YAMYAM)
5273       game.yamyam_content_nr =
5274         (game.yamyam_content_nr + 1) % level.num_yamyam_contents;
5275
5276     return;
5277   }
5278
5279   if (Stop[ex][ey])
5280     return;
5281
5282   x = ex;
5283   y = ey;
5284
5285   if (phase == 1)
5286     GfxFrame[x][y] = 0;         /* restart explosion animation */
5287
5288   last_phase = ExplodeDelay[x][y];
5289
5290   ExplodePhase[x][y] = (phase < last_phase ? phase + 1 : 0);
5291
5292   /* this can happen if the player leaves an explosion just in time */
5293   if (GfxElement[x][y] == EL_UNDEFINED)
5294     GfxElement[x][y] = EL_EMPTY;
5295
5296   border_element = Store2[x][y];
5297   if (IS_PLAYER(x, y) && !PLAYER_EXPLOSION_PROTECTED(x, y))
5298     border_element = StorePlayer[x][y];
5299
5300   if (phase == element_info[border_element].ignition_delay ||
5301       phase == last_phase)
5302   {
5303     boolean border_explosion = FALSE;
5304
5305     if (IS_PLAYER(x, y) && PLAYERINFO(x, y)->present &&
5306         !PLAYER_EXPLOSION_PROTECTED(x, y))
5307     {
5308       KillPlayerUnlessExplosionProtected(x, y);
5309       border_explosion = TRUE;
5310     }
5311     else if (CAN_EXPLODE_BY_EXPLOSION(border_element))
5312     {
5313       Feld[x][y] = Store2[x][y];
5314       Store2[x][y] = 0;
5315       Bang(x, y);
5316       border_explosion = TRUE;
5317     }
5318     else if (border_element == EL_AMOEBA_TO_DIAMOND)
5319     {
5320       AmoebeUmwandeln(x, y);
5321       Store2[x][y] = 0;
5322       border_explosion = TRUE;
5323     }
5324
5325     /* if an element just explodes due to another explosion (chain-reaction),
5326        do not immediately end the new explosion when it was the last frame of
5327        the explosion (as it would be done in the following "if"-statement!) */
5328     if (border_explosion && phase == last_phase)
5329       return;
5330   }
5331
5332   if (phase == last_phase)
5333   {
5334     int element;
5335
5336     element = Feld[x][y] = Store[x][y];
5337     Store[x][y] = Store2[x][y] = 0;
5338     GfxElement[x][y] = EL_UNDEFINED;
5339
5340     /* player can escape from explosions and might therefore be still alive */
5341     if (element >= EL_PLAYER_IS_EXPLODING_1 &&
5342         element <= EL_PLAYER_IS_EXPLODING_4)
5343     {
5344       int player_nr = element - EL_PLAYER_IS_EXPLODING_1;
5345       int explosion_element = EL_PLAYER_1 + player_nr;
5346       int xx = MIN(MAX(0, x - stored_player[player_nr].jx + 1), 2);
5347       int yy = MIN(MAX(0, y - stored_player[player_nr].jy + 1), 2);
5348
5349       if (level.use_explosion_element[player_nr])
5350         explosion_element = level.explosion_element[player_nr];
5351
5352       Feld[x][y] = (stored_player[player_nr].active ? EL_EMPTY :
5353                     element_info[explosion_element].content.e[xx][yy]);
5354     }
5355
5356     /* restore probably existing indestructible background element */
5357     if (Back[x][y] && IS_INDESTRUCTIBLE(Back[x][y]))
5358       element = Feld[x][y] = Back[x][y];
5359     Back[x][y] = 0;
5360
5361     MovDir[x][y] = MovPos[x][y] = MovDelay[x][y] = 0;
5362     GfxDir[x][y] = MV_NONE;
5363     ChangeDelay[x][y] = 0;
5364     ChangePage[x][y] = -1;
5365
5366     CustomValue[x][y] = 0;
5367
5368     InitField_WithBug2(x, y, FALSE);
5369
5370     TEST_DrawLevelField(x, y);
5371
5372     TestIfElementTouchesCustomElement(x, y);
5373
5374     if (GFX_CRUMBLED(element))
5375       TEST_DrawLevelFieldCrumbledNeighbours(x, y);
5376
5377     if (IS_PLAYER(x, y) && !PLAYERINFO(x, y)->present)
5378       StorePlayer[x][y] = 0;
5379
5380     if (ELEM_IS_PLAYER(element))
5381       RelocatePlayer(x, y, element);
5382   }
5383   else if (IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
5384   {
5385     int graphic = el_act2img(GfxElement[x][y], ACTION_EXPLODING);
5386     int frame = getGraphicAnimationFrame(graphic, GfxFrame[x][y]);
5387
5388     if (phase == delay)
5389       TEST_DrawLevelFieldCrumbled(x, y);
5390
5391     if (IS_WALKABLE_OVER(Back[x][y]) && Back[x][y] != EL_EMPTY)
5392     {
5393       DrawLevelElement(x, y, Back[x][y]);
5394       DrawGraphicThruMask(SCREENX(x), SCREENY(y), graphic, frame);
5395     }
5396     else if (IS_WALKABLE_UNDER(Back[x][y]))
5397     {
5398       DrawGraphic(SCREENX(x), SCREENY(y), graphic, frame);
5399       DrawLevelElementThruMask(x, y, Back[x][y]);
5400     }
5401     else if (!IS_WALKABLE_INSIDE(Back[x][y]))
5402       DrawGraphic(SCREENX(x), SCREENY(y), graphic, frame);
5403   }
5404 }
5405
5406 void DynaExplode(int ex, int ey)
5407 {
5408   int i, j;
5409   int dynabomb_element = Feld[ex][ey];
5410   int dynabomb_size = 1;
5411   boolean dynabomb_xl = FALSE;
5412   struct PlayerInfo *player;
5413   static int xy[4][2] =
5414   {
5415     { 0, -1 },
5416     { -1, 0 },
5417     { +1, 0 },
5418     { 0, +1 }
5419   };
5420
5421   if (IS_ACTIVE_BOMB(dynabomb_element))
5422   {
5423     player = &stored_player[dynabomb_element - EL_DYNABOMB_PLAYER_1_ACTIVE];
5424     dynabomb_size = player->dynabomb_size;
5425     dynabomb_xl = player->dynabomb_xl;
5426     player->dynabombs_left++;
5427   }
5428
5429   Explode(ex, ey, EX_PHASE_START, EX_TYPE_CENTER);
5430
5431   for (i = 0; i < NUM_DIRECTIONS; i++)
5432   {
5433     for (j = 1; j <= dynabomb_size; j++)
5434     {
5435       int x = ex + j * xy[i][0];
5436       int y = ey + j * xy[i][1];
5437       int element;
5438
5439       if (!IN_LEV_FIELD(x, y) || IS_INDESTRUCTIBLE(Feld[x][y]))
5440         break;
5441
5442       element = Feld[x][y];
5443
5444       /* do not restart explosions of fields with active bombs */
5445       if (element == EL_EXPLOSION && IS_ACTIVE_BOMB(Store2[x][y]))
5446         continue;
5447
5448       Explode(x, y, EX_PHASE_START, EX_TYPE_BORDER);
5449
5450       if (element != EL_EMPTY && element != EL_EXPLOSION &&
5451           !IS_DIGGABLE(element) && !dynabomb_xl)
5452         break;
5453     }
5454   }
5455 }
5456
5457 void Bang(int x, int y)
5458 {
5459   int element = MovingOrBlocked2Element(x, y);
5460   int explosion_type = EX_TYPE_NORMAL;
5461
5462   if (IS_PLAYER(x, y) && !PLAYER_EXPLOSION_PROTECTED(x, y))
5463   {
5464     struct PlayerInfo *player = PLAYERINFO(x, y);
5465
5466     element = Feld[x][y] = player->initial_element;
5467
5468     if (level.use_explosion_element[player->index_nr])
5469     {
5470       int explosion_element = level.explosion_element[player->index_nr];
5471
5472       if (element_info[explosion_element].explosion_type == EXPLODES_CROSS)
5473         explosion_type = EX_TYPE_CROSS;
5474       else if (element_info[explosion_element].explosion_type == EXPLODES_1X1)
5475         explosion_type = EX_TYPE_CENTER;
5476     }
5477   }
5478
5479   switch (element)
5480   {
5481     case EL_BUG:
5482     case EL_SPACESHIP:
5483     case EL_BD_BUTTERFLY:
5484     case EL_BD_FIREFLY:
5485     case EL_YAMYAM:
5486     case EL_DARK_YAMYAM:
5487     case EL_ROBOT:
5488     case EL_PACMAN:
5489     case EL_MOLE:
5490       RaiseScoreElement(element);
5491       break;
5492
5493     case EL_DYNABOMB_PLAYER_1_ACTIVE:
5494     case EL_DYNABOMB_PLAYER_2_ACTIVE:
5495     case EL_DYNABOMB_PLAYER_3_ACTIVE:
5496     case EL_DYNABOMB_PLAYER_4_ACTIVE:
5497     case EL_DYNABOMB_INCREASE_NUMBER:
5498     case EL_DYNABOMB_INCREASE_SIZE:
5499     case EL_DYNABOMB_INCREASE_POWER:
5500       explosion_type = EX_TYPE_DYNA;
5501       break;
5502
5503     case EL_DC_LANDMINE:
5504       explosion_type = EX_TYPE_CENTER;
5505       break;
5506
5507     case EL_PENGUIN:
5508     case EL_LAMP:
5509     case EL_LAMP_ACTIVE:
5510     case EL_AMOEBA_TO_DIAMOND:
5511       if (!IS_PLAYER(x, y))     /* penguin and player may be at same field */
5512         explosion_type = EX_TYPE_CENTER;
5513       break;
5514
5515     default:
5516       if (element_info[element].explosion_type == EXPLODES_CROSS)
5517         explosion_type = EX_TYPE_CROSS;
5518       else if (element_info[element].explosion_type == EXPLODES_1X1)
5519         explosion_type = EX_TYPE_CENTER;
5520       break;
5521   }
5522
5523   if (explosion_type == EX_TYPE_DYNA)
5524     DynaExplode(x, y);
5525   else
5526     Explode(x, y, EX_PHASE_START, explosion_type);
5527
5528   CheckTriggeredElementChange(x, y, element, CE_EXPLOSION_OF_X);
5529 }
5530
5531 void SplashAcid(int x, int y)
5532 {
5533   if (IN_LEV_FIELD(x - 1, y - 1) && IS_FREE(x - 1, y - 1) &&
5534       (!IN_LEV_FIELD(x - 1, y - 2) ||
5535        !CAN_FALL(MovingOrBlocked2Element(x - 1, y - 2))))
5536     Feld[x - 1][y - 1] = EL_ACID_SPLASH_LEFT;
5537
5538   if (IN_LEV_FIELD(x + 1, y - 1) && IS_FREE(x + 1, y - 1) &&
5539       (!IN_LEV_FIELD(x + 1, y - 2) ||
5540        !CAN_FALL(MovingOrBlocked2Element(x + 1, y - 2))))
5541     Feld[x + 1][y - 1] = EL_ACID_SPLASH_RIGHT;
5542
5543   PlayLevelSound(x, y, SND_ACID_SPLASHING);
5544 }
5545
5546 static void InitBeltMovement()
5547 {
5548   static int belt_base_element[4] =
5549   {
5550     EL_CONVEYOR_BELT_1_LEFT,
5551     EL_CONVEYOR_BELT_2_LEFT,
5552     EL_CONVEYOR_BELT_3_LEFT,
5553     EL_CONVEYOR_BELT_4_LEFT
5554   };
5555   static int belt_base_active_element[4] =
5556   {
5557     EL_CONVEYOR_BELT_1_LEFT_ACTIVE,
5558     EL_CONVEYOR_BELT_2_LEFT_ACTIVE,
5559     EL_CONVEYOR_BELT_3_LEFT_ACTIVE,
5560     EL_CONVEYOR_BELT_4_LEFT_ACTIVE
5561   };
5562
5563   int x, y, i, j;
5564
5565   /* set frame order for belt animation graphic according to belt direction */
5566   for (i = 0; i < NUM_BELTS; i++)
5567   {
5568     int belt_nr = i;
5569
5570     for (j = 0; j < NUM_BELT_PARTS; j++)
5571     {
5572       int element = belt_base_active_element[belt_nr] + j;
5573       int graphic_1 = el2img(element);
5574       int graphic_2 = el2panelimg(element);
5575
5576       if (game.belt_dir[i] == MV_LEFT)
5577       {
5578         graphic_info[graphic_1].anim_mode &= ~ANIM_REVERSE;
5579         graphic_info[graphic_2].anim_mode &= ~ANIM_REVERSE;
5580       }
5581       else
5582       {
5583         graphic_info[graphic_1].anim_mode |=  ANIM_REVERSE;
5584         graphic_info[graphic_2].anim_mode |=  ANIM_REVERSE;
5585       }
5586     }
5587   }
5588
5589   SCAN_PLAYFIELD(x, y)
5590   {
5591     int element = Feld[x][y];
5592
5593     for (i = 0; i < NUM_BELTS; i++)
5594     {
5595       if (IS_BELT(element) && game.belt_dir[i] != MV_NONE)
5596       {
5597         int e_belt_nr = getBeltNrFromBeltElement(element);
5598         int belt_nr = i;
5599
5600         if (e_belt_nr == belt_nr)
5601         {
5602           int belt_part = Feld[x][y] - belt_base_element[belt_nr];
5603
5604           Feld[x][y] = belt_base_active_element[belt_nr] + belt_part;
5605         }
5606       }
5607     }
5608   }
5609 }
5610
5611 static void ToggleBeltSwitch(int x, int y)
5612 {
5613   static int belt_base_element[4] =
5614   {
5615     EL_CONVEYOR_BELT_1_LEFT,
5616     EL_CONVEYOR_BELT_2_LEFT,
5617     EL_CONVEYOR_BELT_3_LEFT,
5618     EL_CONVEYOR_BELT_4_LEFT
5619   };
5620   static int belt_base_active_element[4] =
5621   {
5622     EL_CONVEYOR_BELT_1_LEFT_ACTIVE,
5623     EL_CONVEYOR_BELT_2_LEFT_ACTIVE,
5624     EL_CONVEYOR_BELT_3_LEFT_ACTIVE,
5625     EL_CONVEYOR_BELT_4_LEFT_ACTIVE
5626   };
5627   static int belt_base_switch_element[4] =
5628   {
5629     EL_CONVEYOR_BELT_1_SWITCH_LEFT,
5630     EL_CONVEYOR_BELT_2_SWITCH_LEFT,
5631     EL_CONVEYOR_BELT_3_SWITCH_LEFT,
5632     EL_CONVEYOR_BELT_4_SWITCH_LEFT
5633   };
5634   static int belt_move_dir[4] =
5635   {
5636     MV_LEFT,
5637     MV_NONE,
5638     MV_RIGHT,
5639     MV_NONE,
5640   };
5641
5642   int element = Feld[x][y];
5643   int belt_nr = getBeltNrFromBeltSwitchElement(element);
5644   int belt_dir_nr = (game.belt_dir_nr[belt_nr] + 1) % 4;
5645   int belt_dir = belt_move_dir[belt_dir_nr];
5646   int xx, yy, i;
5647
5648   if (!IS_BELT_SWITCH(element))
5649     return;
5650
5651   game.belt_dir_nr[belt_nr] = belt_dir_nr;
5652   game.belt_dir[belt_nr] = belt_dir;
5653
5654   if (belt_dir_nr == 3)
5655     belt_dir_nr = 1;
5656
5657   /* set frame order for belt animation graphic according to belt direction */
5658   for (i = 0; i < NUM_BELT_PARTS; i++)
5659   {
5660     int element = belt_base_active_element[belt_nr] + i;
5661     int graphic_1 = el2img(element);
5662     int graphic_2 = el2panelimg(element);
5663
5664     if (belt_dir == MV_LEFT)
5665     {
5666       graphic_info[graphic_1].anim_mode &= ~ANIM_REVERSE;
5667       graphic_info[graphic_2].anim_mode &= ~ANIM_REVERSE;
5668     }
5669     else
5670     {
5671       graphic_info[graphic_1].anim_mode |=  ANIM_REVERSE;
5672       graphic_info[graphic_2].anim_mode |=  ANIM_REVERSE;
5673     }
5674   }
5675
5676   SCAN_PLAYFIELD(xx, yy)
5677   {
5678     int element = Feld[xx][yy];
5679
5680     if (IS_BELT_SWITCH(element))
5681     {
5682       int e_belt_nr = getBeltNrFromBeltSwitchElement(element);
5683
5684       if (e_belt_nr == belt_nr)
5685       {
5686         Feld[xx][yy] = belt_base_switch_element[belt_nr] + belt_dir_nr;
5687         TEST_DrawLevelField(xx, yy);
5688       }
5689     }
5690     else if (IS_BELT(element) && belt_dir != MV_NONE)
5691     {
5692       int e_belt_nr = getBeltNrFromBeltElement(element);
5693
5694       if (e_belt_nr == belt_nr)
5695       {
5696         int belt_part = Feld[xx][yy] - belt_base_element[belt_nr];
5697
5698         Feld[xx][yy] = belt_base_active_element[belt_nr] + belt_part;
5699         TEST_DrawLevelField(xx, yy);
5700       }
5701     }
5702     else if (IS_BELT_ACTIVE(element) && belt_dir == MV_NONE)
5703     {
5704       int e_belt_nr = getBeltNrFromBeltActiveElement(element);
5705
5706       if (e_belt_nr == belt_nr)
5707       {
5708         int belt_part = Feld[xx][yy] - belt_base_active_element[belt_nr];
5709
5710         Feld[xx][yy] = belt_base_element[belt_nr] + belt_part;
5711         TEST_DrawLevelField(xx, yy);
5712       }
5713     }
5714   }
5715 }
5716
5717 static void ToggleSwitchgateSwitch(int x, int y)
5718 {
5719   int xx, yy;
5720
5721   game.switchgate_pos = !game.switchgate_pos;
5722
5723   SCAN_PLAYFIELD(xx, yy)
5724   {
5725     int element = Feld[xx][yy];
5726
5727     if (element == EL_SWITCHGATE_SWITCH_UP)
5728     {
5729       Feld[xx][yy] = EL_SWITCHGATE_SWITCH_DOWN;
5730       TEST_DrawLevelField(xx, yy);
5731     }
5732     else if (element == EL_SWITCHGATE_SWITCH_DOWN)
5733     {
5734       Feld[xx][yy] = EL_SWITCHGATE_SWITCH_UP;
5735       TEST_DrawLevelField(xx, yy);
5736     }
5737     else if (element == EL_DC_SWITCHGATE_SWITCH_UP)
5738     {
5739       Feld[xx][yy] = EL_DC_SWITCHGATE_SWITCH_DOWN;
5740       TEST_DrawLevelField(xx, yy);
5741     }
5742     else if (element == EL_DC_SWITCHGATE_SWITCH_DOWN)
5743     {
5744       Feld[xx][yy] = EL_DC_SWITCHGATE_SWITCH_UP;
5745       TEST_DrawLevelField(xx, yy);
5746     }
5747     else if (element == EL_SWITCHGATE_OPEN ||
5748              element == EL_SWITCHGATE_OPENING)
5749     {
5750       Feld[xx][yy] = EL_SWITCHGATE_CLOSING;
5751
5752       PlayLevelSoundAction(xx, yy, ACTION_CLOSING);
5753     }
5754     else if (element == EL_SWITCHGATE_CLOSED ||
5755              element == EL_SWITCHGATE_CLOSING)
5756     {
5757       Feld[xx][yy] = EL_SWITCHGATE_OPENING;
5758
5759       PlayLevelSoundAction(xx, yy, ACTION_OPENING);
5760     }
5761   }
5762 }
5763
5764 static int getInvisibleActiveFromInvisibleElement(int element)
5765 {
5766   return (element == EL_INVISIBLE_STEELWALL ? EL_INVISIBLE_STEELWALL_ACTIVE :
5767           element == EL_INVISIBLE_WALL      ? EL_INVISIBLE_WALL_ACTIVE :
5768           element == EL_INVISIBLE_SAND      ? EL_INVISIBLE_SAND_ACTIVE :
5769           element);
5770 }
5771
5772 static int getInvisibleFromInvisibleActiveElement(int element)
5773 {
5774   return (element == EL_INVISIBLE_STEELWALL_ACTIVE ? EL_INVISIBLE_STEELWALL :
5775           element == EL_INVISIBLE_WALL_ACTIVE      ? EL_INVISIBLE_WALL :
5776           element == EL_INVISIBLE_SAND_ACTIVE      ? EL_INVISIBLE_SAND :
5777           element);
5778 }
5779
5780 static void RedrawAllLightSwitchesAndInvisibleElements()
5781 {
5782   int x, y;
5783
5784   SCAN_PLAYFIELD(x, y)
5785   {
5786     int element = Feld[x][y];
5787
5788     if (element == EL_LIGHT_SWITCH &&
5789         game.light_time_left > 0)
5790     {
5791       Feld[x][y] = EL_LIGHT_SWITCH_ACTIVE;
5792       TEST_DrawLevelField(x, y);
5793     }
5794     else if (element == EL_LIGHT_SWITCH_ACTIVE &&
5795              game.light_time_left == 0)
5796     {
5797       Feld[x][y] = EL_LIGHT_SWITCH;
5798       TEST_DrawLevelField(x, y);
5799     }
5800     else if (element == EL_EMC_DRIPPER &&
5801              game.light_time_left > 0)
5802     {
5803       Feld[x][y] = EL_EMC_DRIPPER_ACTIVE;
5804       TEST_DrawLevelField(x, y);
5805     }
5806     else if (element == EL_EMC_DRIPPER_ACTIVE &&
5807              game.light_time_left == 0)
5808     {
5809       Feld[x][y] = EL_EMC_DRIPPER;
5810       TEST_DrawLevelField(x, y);
5811     }
5812     else if (element == EL_INVISIBLE_STEELWALL ||
5813              element == EL_INVISIBLE_WALL ||
5814              element == EL_INVISIBLE_SAND)
5815     {
5816       if (game.light_time_left > 0)
5817         Feld[x][y] = getInvisibleActiveFromInvisibleElement(element);
5818
5819       TEST_DrawLevelField(x, y);
5820
5821       /* uncrumble neighbour fields, if needed */
5822       if (element == EL_INVISIBLE_SAND)
5823         TEST_DrawLevelFieldCrumbledNeighbours(x, y);
5824     }
5825     else if (element == EL_INVISIBLE_STEELWALL_ACTIVE ||
5826              element == EL_INVISIBLE_WALL_ACTIVE ||
5827              element == EL_INVISIBLE_SAND_ACTIVE)
5828     {
5829       if (game.light_time_left == 0)
5830         Feld[x][y] = getInvisibleFromInvisibleActiveElement(element);
5831
5832       TEST_DrawLevelField(x, y);
5833
5834       /* re-crumble neighbour fields, if needed */
5835       if (element == EL_INVISIBLE_SAND)
5836         TEST_DrawLevelFieldCrumbledNeighbours(x, y);
5837     }
5838   }
5839 }
5840
5841 static void RedrawAllInvisibleElementsForLenses()
5842 {
5843   int x, y;
5844
5845   SCAN_PLAYFIELD(x, y)
5846   {
5847     int element = Feld[x][y];
5848
5849     if (element == EL_EMC_DRIPPER &&
5850         game.lenses_time_left > 0)
5851     {
5852       Feld[x][y] = EL_EMC_DRIPPER_ACTIVE;
5853       TEST_DrawLevelField(x, y);
5854     }
5855     else if (element == EL_EMC_DRIPPER_ACTIVE &&
5856              game.lenses_time_left == 0)
5857     {
5858       Feld[x][y] = EL_EMC_DRIPPER;
5859       TEST_DrawLevelField(x, y);
5860     }
5861     else if (element == EL_INVISIBLE_STEELWALL ||
5862              element == EL_INVISIBLE_WALL ||
5863              element == EL_INVISIBLE_SAND)
5864     {
5865       if (game.lenses_time_left > 0)
5866         Feld[x][y] = getInvisibleActiveFromInvisibleElement(element);
5867
5868       TEST_DrawLevelField(x, y);
5869
5870       /* uncrumble neighbour fields, if needed */
5871       if (element == EL_INVISIBLE_SAND)
5872         TEST_DrawLevelFieldCrumbledNeighbours(x, y);
5873     }
5874     else if (element == EL_INVISIBLE_STEELWALL_ACTIVE ||
5875              element == EL_INVISIBLE_WALL_ACTIVE ||
5876              element == EL_INVISIBLE_SAND_ACTIVE)
5877     {
5878       if (game.lenses_time_left == 0)
5879         Feld[x][y] = getInvisibleFromInvisibleActiveElement(element);
5880
5881       TEST_DrawLevelField(x, y);
5882
5883       /* re-crumble neighbour fields, if needed */
5884       if (element == EL_INVISIBLE_SAND)
5885         TEST_DrawLevelFieldCrumbledNeighbours(x, y);
5886     }
5887   }
5888 }
5889
5890 static void RedrawAllInvisibleElementsForMagnifier()
5891 {
5892   int x, y;
5893
5894   SCAN_PLAYFIELD(x, y)
5895   {
5896     int element = Feld[x][y];
5897
5898     if (element == EL_EMC_FAKE_GRASS &&
5899         game.magnify_time_left > 0)
5900     {
5901       Feld[x][y] = EL_EMC_FAKE_GRASS_ACTIVE;
5902       TEST_DrawLevelField(x, y);
5903     }
5904     else if (element == EL_EMC_FAKE_GRASS_ACTIVE &&
5905              game.magnify_time_left == 0)
5906     {
5907       Feld[x][y] = EL_EMC_FAKE_GRASS;
5908       TEST_DrawLevelField(x, y);
5909     }
5910     else if (IS_GATE_GRAY(element) &&
5911              game.magnify_time_left > 0)
5912     {
5913       Feld[x][y] = (IS_RND_GATE_GRAY(element) ?
5914                     element - EL_GATE_1_GRAY + EL_GATE_1_GRAY_ACTIVE :
5915                     IS_EM_GATE_GRAY(element) ?
5916                     element - EL_EM_GATE_1_GRAY + EL_EM_GATE_1_GRAY_ACTIVE :
5917                     IS_EMC_GATE_GRAY(element) ?
5918                     element - EL_EMC_GATE_5_GRAY + EL_EMC_GATE_5_GRAY_ACTIVE :
5919                     IS_DC_GATE_GRAY(element) ?
5920                     EL_DC_GATE_WHITE_GRAY_ACTIVE :
5921                     element);
5922       TEST_DrawLevelField(x, y);
5923     }
5924     else if (IS_GATE_GRAY_ACTIVE(element) &&
5925              game.magnify_time_left == 0)
5926     {
5927       Feld[x][y] = (IS_RND_GATE_GRAY_ACTIVE(element) ?
5928                     element - EL_GATE_1_GRAY_ACTIVE + EL_GATE_1_GRAY :
5929                     IS_EM_GATE_GRAY_ACTIVE(element) ?
5930                     element - EL_EM_GATE_1_GRAY_ACTIVE + EL_EM_GATE_1_GRAY :
5931                     IS_EMC_GATE_GRAY_ACTIVE(element) ?
5932                     element - EL_EMC_GATE_5_GRAY_ACTIVE + EL_EMC_GATE_5_GRAY :
5933                     IS_DC_GATE_GRAY_ACTIVE(element) ?
5934                     EL_DC_GATE_WHITE_GRAY :
5935                     element);
5936       TEST_DrawLevelField(x, y);
5937     }
5938   }
5939 }
5940
5941 static void ToggleLightSwitch(int x, int y)
5942 {
5943   int element = Feld[x][y];
5944
5945   game.light_time_left =
5946     (element == EL_LIGHT_SWITCH ?
5947      level.time_light * FRAMES_PER_SECOND : 0);
5948
5949   RedrawAllLightSwitchesAndInvisibleElements();
5950 }
5951
5952 static void ActivateTimegateSwitch(int x, int y)
5953 {
5954   int xx, yy;
5955
5956   game.timegate_time_left = level.time_timegate * FRAMES_PER_SECOND;
5957
5958   SCAN_PLAYFIELD(xx, yy)
5959   {
5960     int element = Feld[xx][yy];
5961
5962     if (element == EL_TIMEGATE_CLOSED ||
5963         element == EL_TIMEGATE_CLOSING)
5964     {
5965       Feld[xx][yy] = EL_TIMEGATE_OPENING;
5966       PlayLevelSound(xx, yy, SND_CLASS_TIMEGATE_OPENING);
5967     }
5968
5969     /*
5970     else if (element == EL_TIMEGATE_SWITCH_ACTIVE)
5971     {
5972       Feld[xx][yy] = EL_TIMEGATE_SWITCH;
5973       TEST_DrawLevelField(xx, yy);
5974     }
5975     */
5976
5977   }
5978
5979   Feld[x][y] = (Feld[x][y] == EL_TIMEGATE_SWITCH ? EL_TIMEGATE_SWITCH_ACTIVE :
5980                 EL_DC_TIMEGATE_SWITCH_ACTIVE);
5981 }
5982
5983 void Impact(int x, int y)
5984 {
5985   boolean last_line = (y == lev_fieldy - 1);
5986   boolean object_hit = FALSE;
5987   boolean impact = (last_line || object_hit);
5988   int element = Feld[x][y];
5989   int smashed = EL_STEELWALL;
5990
5991   if (!last_line)       /* check if element below was hit */
5992   {
5993     if (Feld[x][y + 1] == EL_PLAYER_IS_LEAVING)
5994       return;
5995
5996     object_hit = (!IS_FREE(x, y + 1) && (!IS_MOVING(x, y + 1) ||
5997                                          MovDir[x][y + 1] != MV_DOWN ||
5998                                          MovPos[x][y + 1] <= TILEY / 2));
5999
6000     /* do not smash moving elements that left the smashed field in time */
6001     if (game.engine_version >= VERSION_IDENT(2,2,0,7) && IS_MOVING(x, y + 1) &&
6002         ABS(MovPos[x][y + 1] + getElementMoveStepsize(x, y + 1)) >= TILEX)
6003       object_hit = FALSE;
6004
6005 #if USE_QUICKSAND_IMPACT_BUGFIX
6006     if (Feld[x][y + 1] == EL_QUICKSAND_EMPTYING && object_hit == FALSE)
6007     {
6008       RemoveMovingField(x, y + 1);
6009       Feld[x][y + 1] = EL_QUICKSAND_EMPTY;
6010       Feld[x][y + 2] = EL_ROCK;
6011       TEST_DrawLevelField(x, y + 2);
6012
6013       object_hit = TRUE;
6014     }
6015
6016     if (Feld[x][y + 1] == EL_QUICKSAND_FAST_EMPTYING && object_hit == FALSE)
6017     {
6018       RemoveMovingField(x, y + 1);
6019       Feld[x][y + 1] = EL_QUICKSAND_FAST_EMPTY;
6020       Feld[x][y + 2] = EL_ROCK;
6021       TEST_DrawLevelField(x, y + 2);
6022
6023       object_hit = TRUE;
6024     }
6025 #endif
6026
6027     if (object_hit)
6028       smashed = MovingOrBlocked2Element(x, y + 1);
6029
6030     impact = (last_line || object_hit);
6031   }
6032
6033   if (!last_line && smashed == EL_ACID) /* element falls into acid */
6034   {
6035     SplashAcid(x, y + 1);
6036     return;
6037   }
6038
6039   /* !!! not sufficient for all cases -- see EL_PEARL below !!! */
6040   /* only reset graphic animation if graphic really changes after impact */
6041   if (impact &&
6042       el_act_dir2img(element, GfxAction[x][y], MV_DOWN) != el2img(element))
6043   {
6044     ResetGfxAnimation(x, y);
6045     TEST_DrawLevelField(x, y);
6046   }
6047
6048   if (impact && CAN_EXPLODE_IMPACT(element))
6049   {
6050     Bang(x, y);
6051     return;
6052   }
6053   else if (impact && element == EL_PEARL &&
6054            smashed != EL_DC_MAGIC_WALL && smashed != EL_DC_MAGIC_WALL_ACTIVE)
6055   {
6056     ResetGfxAnimation(x, y);
6057
6058     Feld[x][y] = EL_PEARL_BREAKING;
6059     PlayLevelSound(x, y, SND_PEARL_BREAKING);
6060     return;
6061   }
6062   else if (impact && CheckElementChange(x, y, element, smashed, CE_IMPACT))
6063   {
6064     PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
6065
6066     return;
6067   }
6068
6069   if (impact && element == EL_AMOEBA_DROP)
6070   {
6071     if (object_hit && IS_PLAYER(x, y + 1))
6072       KillPlayerUnlessEnemyProtected(x, y + 1);
6073     else if (object_hit && smashed == EL_PENGUIN)
6074       Bang(x, y + 1);
6075     else
6076     {
6077       Feld[x][y] = EL_AMOEBA_GROWING;
6078       Store[x][y] = EL_AMOEBA_WET;
6079
6080       ResetRandomAnimationValue(x, y);
6081     }
6082     return;
6083   }
6084
6085   if (object_hit)               /* check which object was hit */
6086   {
6087     if ((CAN_PASS_MAGIC_WALL(element) &&
6088          (smashed == EL_MAGIC_WALL ||
6089           smashed == EL_BD_MAGIC_WALL)) ||
6090         (CAN_PASS_DC_MAGIC_WALL(element) &&
6091          smashed == EL_DC_MAGIC_WALL))
6092     {
6093       int xx, yy;
6094       int activated_magic_wall =
6095         (smashed == EL_MAGIC_WALL ? EL_MAGIC_WALL_ACTIVE :
6096          smashed == EL_BD_MAGIC_WALL ? EL_BD_MAGIC_WALL_ACTIVE :
6097          EL_DC_MAGIC_WALL_ACTIVE);
6098
6099       /* activate magic wall / mill */
6100       SCAN_PLAYFIELD(xx, yy)
6101       {
6102         if (Feld[xx][yy] == smashed)
6103           Feld[xx][yy] = activated_magic_wall;
6104       }
6105
6106       game.magic_wall_time_left = level.time_magic_wall * FRAMES_PER_SECOND;
6107       game.magic_wall_active = TRUE;
6108
6109       PlayLevelSound(x, y, (smashed == EL_MAGIC_WALL ?
6110                             SND_MAGIC_WALL_ACTIVATING :
6111                             smashed == EL_BD_MAGIC_WALL ?
6112                             SND_BD_MAGIC_WALL_ACTIVATING :
6113                             SND_DC_MAGIC_WALL_ACTIVATING));
6114     }
6115
6116     if (IS_PLAYER(x, y + 1))
6117     {
6118       if (CAN_SMASH_PLAYER(element))
6119       {
6120         KillPlayerUnlessEnemyProtected(x, y + 1);
6121         return;
6122       }
6123     }
6124     else if (smashed == EL_PENGUIN)
6125     {
6126       if (CAN_SMASH_PLAYER(element))
6127       {
6128         Bang(x, y + 1);
6129         return;
6130       }
6131     }
6132     else if (element == EL_BD_DIAMOND)
6133     {
6134       if (IS_CLASSIC_ENEMY(smashed) && IS_BD_ELEMENT(smashed))
6135       {
6136         Bang(x, y + 1);
6137         return;
6138       }
6139     }
6140     else if (((element == EL_SP_INFOTRON ||
6141                element == EL_SP_ZONK) &&
6142               (smashed == EL_SP_SNIKSNAK ||
6143                smashed == EL_SP_ELECTRON ||
6144                smashed == EL_SP_DISK_ORANGE)) ||
6145              (element == EL_SP_INFOTRON &&
6146               smashed == EL_SP_DISK_YELLOW))
6147     {
6148       Bang(x, y + 1);
6149       return;
6150     }
6151     else if (CAN_SMASH_EVERYTHING(element))
6152     {
6153       if (IS_CLASSIC_ENEMY(smashed) ||
6154           CAN_EXPLODE_SMASHED(smashed))
6155       {
6156         Bang(x, y + 1);
6157         return;
6158       }
6159       else if (!IS_MOVING(x, y + 1) && !IS_BLOCKED(x, y + 1))
6160       {
6161         if (smashed == EL_LAMP ||
6162             smashed == EL_LAMP_ACTIVE)
6163         {
6164           Bang(x, y + 1);
6165           return;
6166         }
6167         else if (smashed == EL_NUT)
6168         {
6169           Feld[x][y + 1] = EL_NUT_BREAKING;
6170           PlayLevelSound(x, y, SND_NUT_BREAKING);
6171           RaiseScoreElement(EL_NUT);
6172           return;
6173         }
6174         else if (smashed == EL_PEARL)
6175         {
6176           ResetGfxAnimation(x, y);
6177
6178           Feld[x][y + 1] = EL_PEARL_BREAKING;
6179           PlayLevelSound(x, y, SND_PEARL_BREAKING);
6180           return;
6181         }
6182         else if (smashed == EL_DIAMOND)
6183         {
6184           Feld[x][y + 1] = EL_DIAMOND_BREAKING;
6185           PlayLevelSound(x, y, SND_DIAMOND_BREAKING);
6186           return;
6187         }
6188         else if (IS_BELT_SWITCH(smashed))
6189         {
6190           ToggleBeltSwitch(x, y + 1);
6191         }
6192         else if (smashed == EL_SWITCHGATE_SWITCH_UP ||
6193                  smashed == EL_SWITCHGATE_SWITCH_DOWN ||
6194                  smashed == EL_DC_SWITCHGATE_SWITCH_UP ||
6195                  smashed == EL_DC_SWITCHGATE_SWITCH_DOWN)
6196         {
6197           ToggleSwitchgateSwitch(x, y + 1);
6198         }
6199         else if (smashed == EL_LIGHT_SWITCH ||
6200                  smashed == EL_LIGHT_SWITCH_ACTIVE)
6201         {
6202           ToggleLightSwitch(x, y + 1);
6203         }
6204         else
6205         {
6206           CheckElementChange(x, y + 1, smashed, element, CE_SMASHED);
6207
6208           CheckElementChangeBySide(x, y + 1, smashed, element,
6209                                    CE_SWITCHED, CH_SIDE_TOP);
6210           CheckTriggeredElementChangeBySide(x, y + 1, smashed, CE_SWITCH_OF_X,
6211                                             CH_SIDE_TOP);
6212         }
6213       }
6214       else
6215       {
6216         CheckElementChange(x, y + 1, smashed, element, CE_SMASHED);
6217       }
6218     }
6219   }
6220
6221   /* play sound of magic wall / mill */
6222   if (!last_line &&
6223       (Feld[x][y + 1] == EL_MAGIC_WALL_ACTIVE ||
6224        Feld[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE ||
6225        Feld[x][y + 1] == EL_DC_MAGIC_WALL_ACTIVE))
6226   {
6227     if (Feld[x][y + 1] == EL_MAGIC_WALL_ACTIVE)
6228       PlayLevelSound(x, y, SND_MAGIC_WALL_FILLING);
6229     else if (Feld[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE)
6230       PlayLevelSound(x, y, SND_BD_MAGIC_WALL_FILLING);
6231     else if (Feld[x][y + 1] == EL_DC_MAGIC_WALL_ACTIVE)
6232       PlayLevelSound(x, y, SND_DC_MAGIC_WALL_FILLING);
6233
6234     return;
6235   }
6236
6237   /* play sound of object that hits the ground */
6238   if (last_line || object_hit)
6239     PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
6240 }
6241
6242 inline static void TurnRoundExt(int x, int y)
6243 {
6244   static struct
6245   {
6246     int dx, dy;
6247   } move_xy[] =
6248   {
6249     {  0,  0 },
6250     { -1,  0 },
6251     { +1,  0 },
6252     {  0,  0 },
6253     {  0, -1 },
6254     {  0,  0 }, { 0, 0 }, { 0, 0 },
6255     {  0, +1 }
6256   };
6257   static struct
6258   {
6259     int left, right, back;
6260   } turn[] =
6261   {
6262     { 0,        0,              0        },
6263     { MV_DOWN,  MV_UP,          MV_RIGHT },
6264     { MV_UP,    MV_DOWN,        MV_LEFT  },
6265     { 0,        0,              0        },
6266     { MV_LEFT,  MV_RIGHT,       MV_DOWN  },
6267     { 0,        0,              0        },
6268     { 0,        0,              0        },
6269     { 0,        0,              0        },
6270     { MV_RIGHT, MV_LEFT,        MV_UP    }
6271   };
6272
6273   int element = Feld[x][y];
6274   int move_pattern = element_info[element].move_pattern;
6275
6276   int old_move_dir = MovDir[x][y];
6277   int left_dir  = turn[old_move_dir].left;
6278   int right_dir = turn[old_move_dir].right;
6279   int back_dir  = turn[old_move_dir].back;
6280
6281   int left_dx  = move_xy[left_dir].dx,     left_dy  = move_xy[left_dir].dy;
6282   int right_dx = move_xy[right_dir].dx,    right_dy = move_xy[right_dir].dy;
6283   int move_dx  = move_xy[old_move_dir].dx, move_dy  = move_xy[old_move_dir].dy;
6284   int back_dx  = move_xy[back_dir].dx,     back_dy  = move_xy[back_dir].dy;
6285
6286   int left_x  = x + left_dx,  left_y  = y + left_dy;
6287   int right_x = x + right_dx, right_y = y + right_dy;
6288   int move_x  = x + move_dx,  move_y  = y + move_dy;
6289
6290   int xx, yy;
6291
6292   if (element == EL_BUG || element == EL_BD_BUTTERFLY)
6293   {
6294     TestIfBadThingTouchesOtherBadThing(x, y);
6295
6296     if (ENEMY_CAN_ENTER_FIELD(element, right_x, right_y))
6297       MovDir[x][y] = right_dir;
6298     else if (!ENEMY_CAN_ENTER_FIELD(element, move_x, move_y))
6299       MovDir[x][y] = left_dir;
6300
6301     if (element == EL_BUG && MovDir[x][y] != old_move_dir)
6302       MovDelay[x][y] = 9;
6303     else if (element == EL_BD_BUTTERFLY)     /* && MovDir[x][y] == left_dir) */
6304       MovDelay[x][y] = 1;
6305   }
6306   else if (element == EL_SPACESHIP || element == EL_BD_FIREFLY)
6307   {
6308     TestIfBadThingTouchesOtherBadThing(x, y);
6309
6310     if (ENEMY_CAN_ENTER_FIELD(element, left_x, left_y))
6311       MovDir[x][y] = left_dir;
6312     else if (!ENEMY_CAN_ENTER_FIELD(element, move_x, move_y))
6313       MovDir[x][y] = right_dir;
6314
6315     if (element == EL_SPACESHIP && MovDir[x][y] != old_move_dir)
6316       MovDelay[x][y] = 9;
6317     else if (element == EL_BD_FIREFLY)      /* && MovDir[x][y] == right_dir) */
6318       MovDelay[x][y] = 1;
6319   }
6320   else if (element == EL_SP_SNIKSNAK || element == EL_SP_ELECTRON)
6321   {
6322     TestIfBadThingTouchesOtherBadThing(x, y);
6323
6324     if (ELEMENT_CAN_ENTER_FIELD_BASE_4(element, left_x, left_y, 0))
6325       MovDir[x][y] = left_dir;
6326     else if (!ELEMENT_CAN_ENTER_FIELD_BASE_4(element, move_x, move_y, 0))
6327       MovDir[x][y] = right_dir;
6328
6329     if (MovDir[x][y] != old_move_dir)
6330       MovDelay[x][y] = 9;
6331   }
6332   else if (element == EL_YAMYAM)
6333   {
6334     boolean can_turn_left  = YAMYAM_CAN_ENTER_FIELD(element, left_x, left_y);
6335     boolean can_turn_right = YAMYAM_CAN_ENTER_FIELD(element, right_x, right_y);
6336
6337     if (can_turn_left && can_turn_right)
6338       MovDir[x][y] = (RND(3) ? (RND(2) ? left_dir : right_dir) : back_dir);
6339     else if (can_turn_left)
6340       MovDir[x][y] = (RND(2) ? left_dir : back_dir);
6341     else if (can_turn_right)
6342       MovDir[x][y] = (RND(2) ? right_dir : back_dir);
6343     else
6344       MovDir[x][y] = back_dir;
6345
6346     MovDelay[x][y] = 16 + 16 * RND(3);
6347   }
6348   else if (element == EL_DARK_YAMYAM)
6349   {
6350     boolean can_turn_left  = DARK_YAMYAM_CAN_ENTER_FIELD(element,
6351                                                          left_x, left_y);
6352     boolean can_turn_right = DARK_YAMYAM_CAN_ENTER_FIELD(element,
6353                                                          right_x, right_y);
6354
6355     if (can_turn_left && can_turn_right)
6356       MovDir[x][y] = (RND(3) ? (RND(2) ? left_dir : right_dir) : back_dir);
6357     else if (can_turn_left)
6358       MovDir[x][y] = (RND(2) ? left_dir : back_dir);
6359     else if (can_turn_right)
6360       MovDir[x][y] = (RND(2) ? right_dir : back_dir);
6361     else
6362       MovDir[x][y] = back_dir;
6363
6364     MovDelay[x][y] = 16 + 16 * RND(3);
6365   }
6366   else if (element == EL_PACMAN)
6367   {
6368     boolean can_turn_left  = PACMAN_CAN_ENTER_FIELD(element, left_x, left_y);
6369     boolean can_turn_right = PACMAN_CAN_ENTER_FIELD(element, right_x, right_y);
6370
6371     if (can_turn_left && can_turn_right)
6372       MovDir[x][y] = (RND(3) ? (RND(2) ? left_dir : right_dir) : back_dir);
6373     else if (can_turn_left)
6374       MovDir[x][y] = (RND(2) ? left_dir : back_dir);
6375     else if (can_turn_right)
6376       MovDir[x][y] = (RND(2) ? right_dir : back_dir);
6377     else
6378       MovDir[x][y] = back_dir;
6379
6380     MovDelay[x][y] = 6 + RND(40);
6381   }
6382   else if (element == EL_PIG)
6383   {
6384     boolean can_turn_left  = PIG_CAN_ENTER_FIELD(element, left_x, left_y);
6385     boolean can_turn_right = PIG_CAN_ENTER_FIELD(element, right_x, right_y);
6386     boolean can_move_on    = PIG_CAN_ENTER_FIELD(element, move_x, move_y);
6387     boolean should_turn_left, should_turn_right, should_move_on;
6388     int rnd_value = 24;
6389     int rnd = RND(rnd_value);
6390
6391     should_turn_left = (can_turn_left &&
6392                         (!can_move_on ||
6393                          IN_LEV_FIELD_AND_NOT_FREE(x + back_dx + left_dx,
6394                                                    y + back_dy + left_dy)));
6395     should_turn_right = (can_turn_right &&
6396                          (!can_move_on ||
6397                           IN_LEV_FIELD_AND_NOT_FREE(x + back_dx + right_dx,
6398                                                     y + back_dy + right_dy)));
6399     should_move_on = (can_move_on &&
6400                       (!can_turn_left ||
6401                        !can_turn_right ||
6402                        IN_LEV_FIELD_AND_NOT_FREE(x + move_dx + left_dx,
6403                                                  y + move_dy + left_dy) ||
6404                        IN_LEV_FIELD_AND_NOT_FREE(x + move_dx + right_dx,
6405                                                  y + move_dy + right_dy)));
6406
6407     if (should_turn_left || should_turn_right || should_move_on)
6408     {
6409       if (should_turn_left && should_turn_right && should_move_on)
6410         MovDir[x][y] = (rnd < rnd_value / 3     ? left_dir :
6411                         rnd < 2 * rnd_value / 3 ? right_dir :
6412                         old_move_dir);
6413       else if (should_turn_left && should_turn_right)
6414         MovDir[x][y] = (rnd < rnd_value / 2 ? left_dir : right_dir);
6415       else if (should_turn_left && should_move_on)
6416         MovDir[x][y] = (rnd < rnd_value / 2 ? left_dir : old_move_dir);
6417       else if (should_turn_right && should_move_on)
6418         MovDir[x][y] = (rnd < rnd_value / 2 ? right_dir : old_move_dir);
6419       else if (should_turn_left)
6420         MovDir[x][y] = left_dir;
6421       else if (should_turn_right)
6422         MovDir[x][y] = right_dir;
6423       else if (should_move_on)
6424         MovDir[x][y] = old_move_dir;
6425     }
6426     else if (can_move_on && rnd > rnd_value / 8)
6427       MovDir[x][y] = old_move_dir;
6428     else if (can_turn_left && can_turn_right)
6429       MovDir[x][y] = (rnd < rnd_value / 2 ? left_dir : right_dir);
6430     else if (can_turn_left && rnd > rnd_value / 8)
6431       MovDir[x][y] = left_dir;
6432     else if (can_turn_right && rnd > rnd_value/8)
6433       MovDir[x][y] = right_dir;
6434     else
6435       MovDir[x][y] = back_dir;
6436
6437     xx = x + move_xy[MovDir[x][y]].dx;
6438     yy = y + move_xy[MovDir[x][y]].dy;
6439
6440     if (!IN_LEV_FIELD(xx, yy) ||
6441         (!IS_FREE(xx, yy) && !IS_FOOD_PIG(Feld[xx][yy])))
6442       MovDir[x][y] = old_move_dir;
6443
6444     MovDelay[x][y] = 0;
6445   }
6446   else if (element == EL_DRAGON)
6447   {
6448     boolean can_turn_left  = DRAGON_CAN_ENTER_FIELD(element, left_x, left_y);
6449     boolean can_turn_right = DRAGON_CAN_ENTER_FIELD(element, right_x, right_y);
6450     boolean can_move_on    = DRAGON_CAN_ENTER_FIELD(element, move_x, move_y);
6451     int rnd_value = 24;
6452     int rnd = RND(rnd_value);
6453
6454     if (can_move_on && rnd > rnd_value / 8)
6455       MovDir[x][y] = old_move_dir;
6456     else if (can_turn_left && can_turn_right)
6457       MovDir[x][y] = (rnd < rnd_value / 2 ? left_dir : right_dir);
6458     else if (can_turn_left && rnd > rnd_value / 8)
6459       MovDir[x][y] = left_dir;
6460     else if (can_turn_right && rnd > rnd_value / 8)
6461       MovDir[x][y] = right_dir;
6462     else
6463       MovDir[x][y] = back_dir;
6464
6465     xx = x + move_xy[MovDir[x][y]].dx;
6466     yy = y + move_xy[MovDir[x][y]].dy;
6467
6468     if (!IN_LEV_FIELD_AND_IS_FREE(xx, yy))
6469       MovDir[x][y] = old_move_dir;
6470
6471     MovDelay[x][y] = 0;
6472   }
6473   else if (element == EL_MOLE)
6474   {
6475     boolean can_move_on =
6476       (MOLE_CAN_ENTER_FIELD(element, move_x, move_y,
6477                             IS_AMOEBOID(Feld[move_x][move_y]) ||
6478                             Feld[move_x][move_y] == EL_AMOEBA_SHRINKING));
6479     if (!can_move_on)
6480     {
6481       boolean can_turn_left =
6482         (MOLE_CAN_ENTER_FIELD(element, left_x, left_y,
6483                               IS_AMOEBOID(Feld[left_x][left_y])));
6484
6485       boolean can_turn_right =
6486         (MOLE_CAN_ENTER_FIELD(element, right_x, right_y,
6487                               IS_AMOEBOID(Feld[right_x][right_y])));
6488
6489       if (can_turn_left && can_turn_right)
6490         MovDir[x][y] = (RND(2) ? left_dir : right_dir);
6491       else if (can_turn_left)
6492         MovDir[x][y] = left_dir;
6493       else
6494         MovDir[x][y] = right_dir;
6495     }
6496
6497     if (MovDir[x][y] != old_move_dir)
6498       MovDelay[x][y] = 9;
6499   }
6500   else if (element == EL_BALLOON)
6501   {
6502     MovDir[x][y] = game.wind_direction;
6503     MovDelay[x][y] = 0;
6504   }
6505   else if (element == EL_SPRING)
6506   {
6507     if (MovDir[x][y] & MV_HORIZONTAL)
6508     {
6509       if (SPRING_CAN_BUMP_FROM_FIELD(move_x, move_y) &&
6510           !SPRING_CAN_ENTER_FIELD(element, x, y + 1))
6511       {
6512         Feld[move_x][move_y] = EL_EMC_SPRING_BUMPER_ACTIVE;
6513         ResetGfxAnimation(move_x, move_y);
6514         TEST_DrawLevelField(move_x, move_y);
6515
6516         MovDir[x][y] = back_dir;
6517       }
6518       else if (!SPRING_CAN_ENTER_FIELD(element, move_x, move_y) ||
6519                SPRING_CAN_ENTER_FIELD(element, x, y + 1))
6520         MovDir[x][y] = MV_NONE;
6521     }
6522
6523     MovDelay[x][y] = 0;
6524   }
6525   else if (element == EL_ROBOT ||
6526            element == EL_SATELLITE ||
6527            element == EL_PENGUIN ||
6528            element == EL_EMC_ANDROID)
6529   {
6530     int attr_x = -1, attr_y = -1;
6531
6532     if (AllPlayersGone)
6533     {
6534       attr_x = ExitX;
6535       attr_y = ExitY;
6536     }
6537     else
6538     {
6539       int i;
6540
6541       for (i = 0; i < MAX_PLAYERS; i++)
6542       {
6543         struct PlayerInfo *player = &stored_player[i];
6544         int jx = player->jx, jy = player->jy;
6545
6546         if (!player->active)
6547           continue;
6548
6549         if (attr_x == -1 ||
6550             ABS(jx - x) + ABS(jy - y) < ABS(attr_x - x) + ABS(attr_y - y))
6551         {
6552           attr_x = jx;
6553           attr_y = jy;
6554         }
6555       }
6556     }
6557
6558     if (element == EL_ROBOT && ZX >= 0 && ZY >= 0 &&
6559         (Feld[ZX][ZY] == EL_ROBOT_WHEEL_ACTIVE ||
6560          game.engine_version < VERSION_IDENT(3,1,0,0)))
6561     {
6562       attr_x = ZX;
6563       attr_y = ZY;
6564     }
6565
6566     if (element == EL_PENGUIN)
6567     {
6568       int i;
6569       static int xy[4][2] =
6570       {
6571         { 0, -1 },
6572         { -1, 0 },
6573         { +1, 0 },
6574         { 0, +1 }
6575       };
6576
6577       for (i = 0; i < NUM_DIRECTIONS; i++)
6578       {
6579         int ex = x + xy[i][0];
6580         int ey = y + xy[i][1];
6581
6582         if (IN_LEV_FIELD(ex, ey) && (Feld[ex][ey] == EL_EXIT_OPEN ||
6583                                      Feld[ex][ey] == EL_EM_EXIT_OPEN ||
6584                                      Feld[ex][ey] == EL_STEEL_EXIT_OPEN ||
6585                                      Feld[ex][ey] == EL_EM_STEEL_EXIT_OPEN))
6586         {
6587           attr_x = ex;
6588           attr_y = ey;
6589           break;
6590         }
6591       }
6592     }
6593
6594     MovDir[x][y] = MV_NONE;
6595     if (attr_x < x)
6596       MovDir[x][y] |= (AllPlayersGone ? MV_RIGHT : MV_LEFT);
6597     else if (attr_x > x)
6598       MovDir[x][y] |= (AllPlayersGone ? MV_LEFT : MV_RIGHT);
6599     if (attr_y < y)
6600       MovDir[x][y] |= (AllPlayersGone ? MV_DOWN : MV_UP);
6601     else if (attr_y > y)
6602       MovDir[x][y] |= (AllPlayersGone ? MV_UP : MV_DOWN);
6603
6604     if (element == EL_ROBOT)
6605     {
6606       int newx, newy;
6607
6608       if (MovDir[x][y] & MV_HORIZONTAL && MovDir[x][y] & MV_VERTICAL)
6609         MovDir[x][y] &= (RND(2) ? MV_HORIZONTAL : MV_VERTICAL);
6610       Moving2Blocked(x, y, &newx, &newy);
6611
6612       if (IN_LEV_FIELD(newx, newy) && IS_FREE_OR_PLAYER(newx, newy))
6613         MovDelay[x][y] = 8 + 8 * !RND(3);
6614       else
6615         MovDelay[x][y] = 16;
6616     }
6617     else if (element == EL_PENGUIN)
6618     {
6619       int newx, newy;
6620
6621       MovDelay[x][y] = 1;
6622
6623       if (MovDir[x][y] & MV_HORIZONTAL && MovDir[x][y] & MV_VERTICAL)
6624       {
6625         boolean first_horiz = RND(2);
6626         int new_move_dir = MovDir[x][y];
6627
6628         MovDir[x][y] =
6629           new_move_dir & (first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
6630         Moving2Blocked(x, y, &newx, &newy);
6631
6632         if (PENGUIN_CAN_ENTER_FIELD(element, newx, newy))
6633           return;
6634
6635         MovDir[x][y] =
6636           new_move_dir & (!first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
6637         Moving2Blocked(x, y, &newx, &newy);
6638
6639         if (PENGUIN_CAN_ENTER_FIELD(element, newx, newy))
6640           return;
6641
6642         MovDir[x][y] = old_move_dir;
6643         return;
6644       }
6645     }
6646     else if (element == EL_SATELLITE)
6647     {
6648       int newx, newy;
6649
6650       MovDelay[x][y] = 1;
6651
6652       if (MovDir[x][y] & MV_HORIZONTAL && MovDir[x][y] & MV_VERTICAL)
6653       {
6654         boolean first_horiz = RND(2);
6655         int new_move_dir = MovDir[x][y];
6656
6657         MovDir[x][y] =
6658           new_move_dir & (first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
6659         Moving2Blocked(x, y, &newx, &newy);
6660
6661         if (SATELLITE_CAN_ENTER_FIELD(newx, newy))
6662           return;
6663
6664         MovDir[x][y] =
6665           new_move_dir & (!first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
6666         Moving2Blocked(x, y, &newx, &newy);
6667
6668         if (SATELLITE_CAN_ENTER_FIELD(newx, newy))
6669           return;
6670
6671         MovDir[x][y] = old_move_dir;
6672         return;
6673       }
6674     }
6675     else if (element == EL_EMC_ANDROID)
6676     {
6677       static int check_pos[16] =
6678       {
6679         -1,             /*  0 => (invalid)          */
6680         7,              /*  1 => MV_LEFT            */
6681         3,              /*  2 => MV_RIGHT           */
6682         -1,             /*  3 => (invalid)          */
6683         1,              /*  4 =>            MV_UP   */
6684         0,              /*  5 => MV_LEFT  | MV_UP   */
6685         2,              /*  6 => MV_RIGHT | MV_UP   */
6686         -1,             /*  7 => (invalid)          */
6687         5,              /*  8 =>            MV_DOWN */
6688         6,              /*  9 => MV_LEFT  | MV_DOWN */
6689         4,              /* 10 => MV_RIGHT | MV_DOWN */
6690         -1,             /* 11 => (invalid)          */
6691         -1,             /* 12 => (invalid)          */
6692         -1,             /* 13 => (invalid)          */
6693         -1,             /* 14 => (invalid)          */
6694         -1,             /* 15 => (invalid)          */
6695       };
6696       static struct
6697       {
6698         int dx, dy;
6699         int dir;
6700       } check_xy[8] =
6701       {
6702         { -1, -1,       MV_LEFT  | MV_UP   },
6703         {  0, -1,                  MV_UP   },
6704         { +1, -1,       MV_RIGHT | MV_UP   },
6705         { +1,  0,       MV_RIGHT           },
6706         { +1, +1,       MV_RIGHT | MV_DOWN },
6707         {  0, +1,                  MV_DOWN },
6708         { -1, +1,       MV_LEFT  | MV_DOWN },
6709         { -1,  0,       MV_LEFT            },
6710       };
6711       int start_pos, check_order;
6712       boolean can_clone = FALSE;
6713       int i;
6714
6715       /* check if there is any free field around current position */
6716       for (i = 0; i < 8; i++)
6717       {
6718         int newx = x + check_xy[i].dx;
6719         int newy = y + check_xy[i].dy;
6720
6721         if (IN_LEV_FIELD_AND_IS_FREE(newx, newy))
6722         {
6723           can_clone = TRUE;
6724
6725           break;
6726         }
6727       }
6728
6729       if (can_clone)            /* randomly find an element to clone */
6730       {
6731         can_clone = FALSE;
6732
6733         start_pos = check_pos[RND(8)];
6734         check_order = (RND(2) ? -1 : +1);
6735
6736         for (i = 0; i < 8; i++)
6737         {
6738           int pos_raw = start_pos + i * check_order;
6739           int pos = (pos_raw + 8) % 8;
6740           int newx = x + check_xy[pos].dx;
6741           int newy = y + check_xy[pos].dy;
6742
6743           if (ANDROID_CAN_CLONE_FIELD(newx, newy))
6744           {
6745             element_info[element].move_leave_type = LEAVE_TYPE_LIMITED;
6746             element_info[element].move_leave_element = EL_TRIGGER_ELEMENT;
6747
6748             Store[x][y] = Feld[newx][newy];
6749
6750             can_clone = TRUE;
6751
6752             break;
6753           }
6754         }
6755       }
6756
6757       if (can_clone)            /* randomly find a direction to move */
6758       {
6759         can_clone = FALSE;
6760
6761         start_pos = check_pos[RND(8)];
6762         check_order = (RND(2) ? -1 : +1);
6763
6764         for (i = 0; i < 8; i++)
6765         {
6766           int pos_raw = start_pos + i * check_order;
6767           int pos = (pos_raw + 8) % 8;
6768           int newx = x + check_xy[pos].dx;
6769           int newy = y + check_xy[pos].dy;
6770           int new_move_dir = check_xy[pos].dir;
6771
6772           if (IN_LEV_FIELD_AND_IS_FREE(newx, newy))
6773           {
6774             MovDir[x][y] = new_move_dir;
6775             MovDelay[x][y] = level.android_clone_time * 8 + 1;
6776
6777             can_clone = TRUE;
6778
6779             break;
6780           }
6781         }
6782       }
6783
6784       if (can_clone)            /* cloning and moving successful */
6785         return;
6786
6787       /* cannot clone -- try to move towards player */
6788
6789       start_pos = check_pos[MovDir[x][y] & 0x0f];
6790       check_order = (RND(2) ? -1 : +1);
6791
6792       for (i = 0; i < 3; i++)
6793       {
6794         /* first check start_pos, then previous/next or (next/previous) pos */
6795         int pos_raw = start_pos + (i < 2 ? i : -1) * check_order;
6796         int pos = (pos_raw + 8) % 8;
6797         int newx = x + check_xy[pos].dx;
6798         int newy = y + check_xy[pos].dy;
6799         int new_move_dir = check_xy[pos].dir;
6800
6801         if (IS_PLAYER(newx, newy))
6802           break;
6803
6804         if (ANDROID_CAN_ENTER_FIELD(element, newx, newy))
6805         {
6806           MovDir[x][y] = new_move_dir;
6807           MovDelay[x][y] = level.android_move_time * 8 + 1;
6808
6809           break;
6810         }
6811       }
6812     }
6813   }
6814   else if (move_pattern == MV_TURNING_LEFT ||
6815            move_pattern == MV_TURNING_RIGHT ||
6816            move_pattern == MV_TURNING_LEFT_RIGHT ||
6817            move_pattern == MV_TURNING_RIGHT_LEFT ||
6818            move_pattern == MV_TURNING_RANDOM ||
6819            move_pattern == MV_ALL_DIRECTIONS)
6820   {
6821     boolean can_turn_left =
6822       CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, left_x, left_y);
6823     boolean can_turn_right =
6824       CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, right_x,right_y);
6825
6826     if (element_info[element].move_stepsize == 0)       /* "not moving" */
6827       return;
6828
6829     if (move_pattern == MV_TURNING_LEFT)
6830       MovDir[x][y] = left_dir;
6831     else if (move_pattern == MV_TURNING_RIGHT)
6832       MovDir[x][y] = right_dir;
6833     else if (move_pattern == MV_TURNING_LEFT_RIGHT)
6834       MovDir[x][y] = (can_turn_left || !can_turn_right ? left_dir : right_dir);
6835     else if (move_pattern == MV_TURNING_RIGHT_LEFT)
6836       MovDir[x][y] = (can_turn_right || !can_turn_left ? right_dir : left_dir);
6837     else if (move_pattern == MV_TURNING_RANDOM)
6838       MovDir[x][y] = (can_turn_left && !can_turn_right ? left_dir :
6839                       can_turn_right && !can_turn_left ? right_dir :
6840                       RND(2) ? left_dir : right_dir);
6841     else if (can_turn_left && can_turn_right)
6842       MovDir[x][y] = (RND(3) ? (RND(2) ? left_dir : right_dir) : back_dir);
6843     else if (can_turn_left)
6844       MovDir[x][y] = (RND(2) ? left_dir : back_dir);
6845     else if (can_turn_right)
6846       MovDir[x][y] = (RND(2) ? right_dir : back_dir);
6847     else
6848       MovDir[x][y] = back_dir;
6849
6850     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
6851   }
6852   else if (move_pattern == MV_HORIZONTAL ||
6853            move_pattern == MV_VERTICAL)
6854   {
6855     if (move_pattern & old_move_dir)
6856       MovDir[x][y] = back_dir;
6857     else if (move_pattern == MV_HORIZONTAL)
6858       MovDir[x][y] = (RND(2) ? MV_LEFT : MV_RIGHT);
6859     else if (move_pattern == MV_VERTICAL)
6860       MovDir[x][y] = (RND(2) ? MV_UP : MV_DOWN);
6861
6862     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
6863   }
6864   else if (move_pattern & MV_ANY_DIRECTION)
6865   {
6866     MovDir[x][y] = move_pattern;
6867     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
6868   }
6869   else if (move_pattern & MV_WIND_DIRECTION)
6870   {
6871     MovDir[x][y] = game.wind_direction;
6872     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
6873   }
6874   else if (move_pattern == MV_ALONG_LEFT_SIDE)
6875   {
6876     if (CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, left_x, left_y))
6877       MovDir[x][y] = left_dir;
6878     else if (!CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, move_x, move_y))
6879       MovDir[x][y] = right_dir;
6880
6881     if (MovDir[x][y] != old_move_dir)
6882       MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
6883   }
6884   else if (move_pattern == MV_ALONG_RIGHT_SIDE)
6885   {
6886     if (CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, right_x, right_y))
6887       MovDir[x][y] = right_dir;
6888     else if (!CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, move_x, move_y))
6889       MovDir[x][y] = left_dir;
6890
6891     if (MovDir[x][y] != old_move_dir)
6892       MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
6893   }
6894   else if (move_pattern == MV_TOWARDS_PLAYER ||
6895            move_pattern == MV_AWAY_FROM_PLAYER)
6896   {
6897     int attr_x = -1, attr_y = -1;
6898     int newx, newy;
6899     boolean move_away = (move_pattern == MV_AWAY_FROM_PLAYER);
6900
6901     if (AllPlayersGone)
6902     {
6903       attr_x = ExitX;
6904       attr_y = ExitY;
6905     }
6906     else
6907     {
6908       int i;
6909
6910       for (i = 0; i < MAX_PLAYERS; i++)
6911       {
6912         struct PlayerInfo *player = &stored_player[i];
6913         int jx = player->jx, jy = player->jy;
6914
6915         if (!player->active)
6916           continue;
6917
6918         if (attr_x == -1 ||
6919             ABS(jx - x) + ABS(jy - y) < ABS(attr_x - x) + ABS(attr_y - y))
6920         {
6921           attr_x = jx;
6922           attr_y = jy;
6923         }
6924       }
6925     }
6926
6927     MovDir[x][y] = MV_NONE;
6928     if (attr_x < x)
6929       MovDir[x][y] |= (move_away ? MV_RIGHT : MV_LEFT);
6930     else if (attr_x > x)
6931       MovDir[x][y] |= (move_away ? MV_LEFT : MV_RIGHT);
6932     if (attr_y < y)
6933       MovDir[x][y] |= (move_away ? MV_DOWN : MV_UP);
6934     else if (attr_y > y)
6935       MovDir[x][y] |= (move_away ? MV_UP : MV_DOWN);
6936
6937     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
6938
6939     if (MovDir[x][y] & MV_HORIZONTAL && MovDir[x][y] & MV_VERTICAL)
6940     {
6941       boolean first_horiz = RND(2);
6942       int new_move_dir = MovDir[x][y];
6943
6944       if (element_info[element].move_stepsize == 0)     /* "not moving" */
6945       {
6946         first_horiz = (ABS(attr_x - x) >= ABS(attr_y - y));
6947         MovDir[x][y] &= (first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
6948
6949         return;
6950       }
6951
6952       MovDir[x][y] =
6953         new_move_dir & (first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
6954       Moving2Blocked(x, y, &newx, &newy);
6955
6956       if (CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, newx, newy))
6957         return;
6958
6959       MovDir[x][y] =
6960         new_move_dir & (!first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
6961       Moving2Blocked(x, y, &newx, &newy);
6962
6963       if (CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, newx, newy))
6964         return;
6965
6966       MovDir[x][y] = old_move_dir;
6967     }
6968   }
6969   else if (move_pattern == MV_WHEN_PUSHED ||
6970            move_pattern == MV_WHEN_DROPPED)
6971   {
6972     if (!CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, move_x, move_y))
6973       MovDir[x][y] = MV_NONE;
6974
6975     MovDelay[x][y] = 0;
6976   }
6977   else if (move_pattern & MV_MAZE_RUNNER_STYLE)
6978   {
6979     static int test_xy[7][2] =
6980     {
6981       { 0, -1 },
6982       { -1, 0 },
6983       { +1, 0 },
6984       { 0, +1 },
6985       { 0, -1 },
6986       { -1, 0 },
6987       { +1, 0 },
6988     };
6989     static int test_dir[7] =
6990     {
6991       MV_UP,
6992       MV_LEFT,
6993       MV_RIGHT,
6994       MV_DOWN,
6995       MV_UP,
6996       MV_LEFT,
6997       MV_RIGHT,
6998     };
6999     boolean hunter_mode = (move_pattern == MV_MAZE_HUNTER);
7000     int move_preference = -1000000;     /* start with very low preference */
7001     int new_move_dir = MV_NONE;
7002     int start_test = RND(4);
7003     int i;
7004
7005     for (i = 0; i < NUM_DIRECTIONS; i++)
7006     {
7007       int move_dir = test_dir[start_test + i];
7008       int move_dir_preference;
7009
7010       xx = x + test_xy[start_test + i][0];
7011       yy = y + test_xy[start_test + i][1];
7012
7013       if (hunter_mode && IN_LEV_FIELD(xx, yy) &&
7014           (IS_PLAYER(xx, yy) || Feld[xx][yy] == EL_PLAYER_IS_LEAVING))
7015       {
7016         new_move_dir = move_dir;
7017
7018         break;
7019       }
7020
7021       if (!CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, xx, yy))
7022         continue;
7023
7024       move_dir_preference = -1 * RunnerVisit[xx][yy];
7025       if (hunter_mode && PlayerVisit[xx][yy] > 0)
7026         move_dir_preference = PlayerVisit[xx][yy];
7027
7028       if (move_dir_preference > move_preference)
7029       {
7030         /* prefer field that has not been visited for the longest time */
7031         move_preference = move_dir_preference;
7032         new_move_dir = move_dir;
7033       }
7034       else if (move_dir_preference == move_preference &&
7035                move_dir == old_move_dir)
7036       {
7037         /* prefer last direction when all directions are preferred equally */
7038         move_preference = move_dir_preference;
7039         new_move_dir = move_dir;
7040       }
7041     }
7042
7043     MovDir[x][y] = new_move_dir;
7044     if (old_move_dir != new_move_dir)
7045       MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
7046   }
7047 }
7048
7049 static void TurnRound(int x, int y)
7050 {
7051   int direction = MovDir[x][y];
7052
7053   TurnRoundExt(x, y);
7054
7055   GfxDir[x][y] = MovDir[x][y];
7056
7057   if (direction != MovDir[x][y])
7058     GfxFrame[x][y] = 0;
7059
7060   if (MovDelay[x][y])
7061     GfxAction[x][y] = ACTION_TURNING_FROM_LEFT + MV_DIR_TO_BIT(direction);
7062
7063   ResetGfxFrame(x, y);
7064 }
7065
7066 static boolean JustBeingPushed(int x, int y)
7067 {
7068   int i;
7069
7070   for (i = 0; i < MAX_PLAYERS; i++)
7071   {
7072     struct PlayerInfo *player = &stored_player[i];
7073
7074     if (player->active && player->is_pushing && player->MovPos)
7075     {
7076       int next_jx = player->jx + (player->jx - player->last_jx);
7077       int next_jy = player->jy + (player->jy - player->last_jy);
7078
7079       if (x == next_jx && y == next_jy)
7080         return TRUE;
7081     }
7082   }
7083
7084   return FALSE;
7085 }
7086
7087 void StartMoving(int x, int y)
7088 {
7089   boolean started_moving = FALSE;       /* some elements can fall _and_ move */
7090   int element = Feld[x][y];
7091
7092   if (Stop[x][y])
7093     return;
7094
7095   if (MovDelay[x][y] == 0)
7096     GfxAction[x][y] = ACTION_DEFAULT;
7097
7098   if (CAN_FALL(element) && y < lev_fieldy - 1)
7099   {
7100     if ((x > 0              && IS_PLAYER(x - 1, y)) ||
7101         (x < lev_fieldx - 1 && IS_PLAYER(x + 1, y)))
7102       if (JustBeingPushed(x, y))
7103         return;
7104
7105     if (element == EL_QUICKSAND_FULL)
7106     {
7107       if (IS_FREE(x, y + 1))
7108       {
7109         InitMovingField(x, y, MV_DOWN);
7110         started_moving = TRUE;
7111
7112         Feld[x][y] = EL_QUICKSAND_EMPTYING;
7113 #if USE_QUICKSAND_BD_ROCK_BUGFIX
7114         if (Store[x][y] != EL_ROCK && Store[x][y] != EL_BD_ROCK)
7115           Store[x][y] = EL_ROCK;
7116 #else
7117         Store[x][y] = EL_ROCK;
7118 #endif
7119
7120         PlayLevelSoundAction(x, y, ACTION_EMPTYING);
7121       }
7122       else if (Feld[x][y + 1] == EL_QUICKSAND_EMPTY)
7123       {
7124         if (!MovDelay[x][y])
7125         {
7126           MovDelay[x][y] = TILEY + 1;
7127
7128           ResetGfxAnimation(x, y);
7129           ResetGfxAnimation(x, y + 1);
7130         }
7131
7132         if (MovDelay[x][y])
7133         {
7134           DrawLevelElement(x, y, EL_QUICKSAND_EMPTYING);
7135           DrawLevelElement(x, y + 1, EL_QUICKSAND_FILLING);
7136
7137           MovDelay[x][y]--;
7138           if (MovDelay[x][y])
7139             return;
7140         }
7141
7142         Feld[x][y] = EL_QUICKSAND_EMPTY;
7143         Feld[x][y + 1] = EL_QUICKSAND_FULL;
7144         Store[x][y + 1] = Store[x][y];
7145         Store[x][y] = 0;
7146
7147         PlayLevelSoundAction(x, y, ACTION_FILLING);
7148       }
7149       else if (Feld[x][y + 1] == EL_QUICKSAND_FAST_EMPTY)
7150       {
7151         if (!MovDelay[x][y])
7152         {
7153           MovDelay[x][y] = TILEY + 1;
7154
7155           ResetGfxAnimation(x, y);
7156           ResetGfxAnimation(x, y + 1);
7157         }
7158
7159         if (MovDelay[x][y])
7160         {
7161           DrawLevelElement(x, y, EL_QUICKSAND_EMPTYING);
7162           DrawLevelElement(x, y + 1, EL_QUICKSAND_FAST_FILLING);
7163
7164           MovDelay[x][y]--;
7165           if (MovDelay[x][y])
7166             return;
7167         }
7168
7169         Feld[x][y] = EL_QUICKSAND_EMPTY;
7170         Feld[x][y + 1] = EL_QUICKSAND_FAST_FULL;
7171         Store[x][y + 1] = Store[x][y];
7172         Store[x][y] = 0;
7173
7174         PlayLevelSoundAction(x, y, ACTION_FILLING);
7175       }
7176     }
7177     else if (element == EL_QUICKSAND_FAST_FULL)
7178     {
7179       if (IS_FREE(x, y + 1))
7180       {
7181         InitMovingField(x, y, MV_DOWN);
7182         started_moving = TRUE;
7183
7184         Feld[x][y] = EL_QUICKSAND_FAST_EMPTYING;
7185 #if USE_QUICKSAND_BD_ROCK_BUGFIX
7186         if (Store[x][y] != EL_ROCK && Store[x][y] != EL_BD_ROCK)
7187           Store[x][y] = EL_ROCK;
7188 #else
7189         Store[x][y] = EL_ROCK;
7190 #endif
7191
7192         PlayLevelSoundAction(x, y, ACTION_EMPTYING);
7193       }
7194       else if (Feld[x][y + 1] == EL_QUICKSAND_FAST_EMPTY)
7195       {
7196         if (!MovDelay[x][y])
7197         {
7198           MovDelay[x][y] = TILEY + 1;
7199
7200           ResetGfxAnimation(x, y);
7201           ResetGfxAnimation(x, y + 1);
7202         }
7203
7204         if (MovDelay[x][y])
7205         {
7206           DrawLevelElement(x, y, EL_QUICKSAND_FAST_EMPTYING);
7207           DrawLevelElement(x, y + 1, EL_QUICKSAND_FAST_FILLING);
7208
7209           MovDelay[x][y]--;
7210           if (MovDelay[x][y])
7211             return;
7212         }
7213
7214         Feld[x][y] = EL_QUICKSAND_FAST_EMPTY;
7215         Feld[x][y + 1] = EL_QUICKSAND_FAST_FULL;
7216         Store[x][y + 1] = Store[x][y];
7217         Store[x][y] = 0;
7218
7219         PlayLevelSoundAction(x, y, ACTION_FILLING);
7220       }
7221       else if (Feld[x][y + 1] == EL_QUICKSAND_EMPTY)
7222       {
7223         if (!MovDelay[x][y])
7224         {
7225           MovDelay[x][y] = TILEY + 1;
7226
7227           ResetGfxAnimation(x, y);
7228           ResetGfxAnimation(x, y + 1);
7229         }
7230
7231         if (MovDelay[x][y])
7232         {
7233           DrawLevelElement(x, y, EL_QUICKSAND_FAST_EMPTYING);
7234           DrawLevelElement(x, y + 1, EL_QUICKSAND_FILLING);
7235
7236           MovDelay[x][y]--;
7237           if (MovDelay[x][y])
7238             return;
7239         }
7240
7241         Feld[x][y] = EL_QUICKSAND_FAST_EMPTY;
7242         Feld[x][y + 1] = EL_QUICKSAND_FULL;
7243         Store[x][y + 1] = Store[x][y];
7244         Store[x][y] = 0;
7245
7246         PlayLevelSoundAction(x, y, ACTION_FILLING);
7247       }
7248     }
7249     else if ((element == EL_ROCK || element == EL_BD_ROCK) &&
7250              Feld[x][y + 1] == EL_QUICKSAND_EMPTY)
7251     {
7252       InitMovingField(x, y, MV_DOWN);
7253       started_moving = TRUE;
7254
7255       Feld[x][y] = EL_QUICKSAND_FILLING;
7256       Store[x][y] = element;
7257
7258       PlayLevelSoundAction(x, y, ACTION_FILLING);
7259     }
7260     else if ((element == EL_ROCK || element == EL_BD_ROCK) &&
7261              Feld[x][y + 1] == EL_QUICKSAND_FAST_EMPTY)
7262     {
7263       InitMovingField(x, y, MV_DOWN);
7264       started_moving = TRUE;
7265
7266       Feld[x][y] = EL_QUICKSAND_FAST_FILLING;
7267       Store[x][y] = element;
7268
7269       PlayLevelSoundAction(x, y, ACTION_FILLING);
7270     }
7271     else if (element == EL_MAGIC_WALL_FULL)
7272     {
7273       if (IS_FREE(x, y + 1))
7274       {
7275         InitMovingField(x, y, MV_DOWN);
7276         started_moving = TRUE;
7277
7278         Feld[x][y] = EL_MAGIC_WALL_EMPTYING;
7279         Store[x][y] = EL_CHANGED(Store[x][y]);
7280       }
7281       else if (Feld[x][y + 1] == EL_MAGIC_WALL_ACTIVE)
7282       {
7283         if (!MovDelay[x][y])
7284           MovDelay[x][y] = TILEY / 4 + 1;
7285
7286         if (MovDelay[x][y])
7287         {
7288           MovDelay[x][y]--;
7289           if (MovDelay[x][y])
7290             return;
7291         }
7292
7293         Feld[x][y] = EL_MAGIC_WALL_ACTIVE;
7294         Feld[x][y + 1] = EL_MAGIC_WALL_FULL;
7295         Store[x][y + 1] = EL_CHANGED(Store[x][y]);
7296         Store[x][y] = 0;
7297       }
7298     }
7299     else if (element == EL_BD_MAGIC_WALL_FULL)
7300     {
7301       if (IS_FREE(x, y + 1))
7302       {
7303         InitMovingField(x, y, MV_DOWN);
7304         started_moving = TRUE;
7305
7306         Feld[x][y] = EL_BD_MAGIC_WALL_EMPTYING;
7307         Store[x][y] = EL_CHANGED_BD(Store[x][y]);
7308       }
7309       else if (Feld[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE)
7310       {
7311         if (!MovDelay[x][y])
7312           MovDelay[x][y] = TILEY / 4 + 1;
7313
7314         if (MovDelay[x][y])
7315         {
7316           MovDelay[x][y]--;
7317           if (MovDelay[x][y])
7318             return;
7319         }
7320
7321         Feld[x][y] = EL_BD_MAGIC_WALL_ACTIVE;
7322         Feld[x][y + 1] = EL_BD_MAGIC_WALL_FULL;
7323         Store[x][y + 1] = EL_CHANGED_BD(Store[x][y]);
7324         Store[x][y] = 0;
7325       }
7326     }
7327     else if (element == EL_DC_MAGIC_WALL_FULL)
7328     {
7329       if (IS_FREE(x, y + 1))
7330       {
7331         InitMovingField(x, y, MV_DOWN);
7332         started_moving = TRUE;
7333
7334         Feld[x][y] = EL_DC_MAGIC_WALL_EMPTYING;
7335         Store[x][y] = EL_CHANGED_DC(Store[x][y]);
7336       }
7337       else if (Feld[x][y + 1] == EL_DC_MAGIC_WALL_ACTIVE)
7338       {
7339         if (!MovDelay[x][y])
7340           MovDelay[x][y] = TILEY / 4 + 1;
7341
7342         if (MovDelay[x][y])
7343         {
7344           MovDelay[x][y]--;
7345           if (MovDelay[x][y])
7346             return;
7347         }
7348
7349         Feld[x][y] = EL_DC_MAGIC_WALL_ACTIVE;
7350         Feld[x][y + 1] = EL_DC_MAGIC_WALL_FULL;
7351         Store[x][y + 1] = EL_CHANGED_DC(Store[x][y]);
7352         Store[x][y] = 0;
7353       }
7354     }
7355     else if ((CAN_PASS_MAGIC_WALL(element) &&
7356               (Feld[x][y + 1] == EL_MAGIC_WALL_ACTIVE ||
7357                Feld[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE)) ||
7358              (CAN_PASS_DC_MAGIC_WALL(element) &&
7359               (Feld[x][y + 1] == EL_DC_MAGIC_WALL_ACTIVE)))
7360
7361     {
7362       InitMovingField(x, y, MV_DOWN);
7363       started_moving = TRUE;
7364
7365       Feld[x][y] =
7366         (Feld[x][y + 1] == EL_MAGIC_WALL_ACTIVE ? EL_MAGIC_WALL_FILLING :
7367          Feld[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE ? EL_BD_MAGIC_WALL_FILLING :
7368          EL_DC_MAGIC_WALL_FILLING);
7369       Store[x][y] = element;
7370     }
7371     else if (CAN_FALL(element) && Feld[x][y + 1] == EL_ACID)
7372     {
7373       SplashAcid(x, y + 1);
7374
7375       InitMovingField(x, y, MV_DOWN);
7376       started_moving = TRUE;
7377
7378       Store[x][y] = EL_ACID;
7379     }
7380     else if (
7381              (game.engine_version >= VERSION_IDENT(3,1,0,0) &&
7382               CheckImpact[x][y] && !IS_FREE(x, y + 1)) ||
7383              (game.engine_version >= VERSION_IDENT(3,0,7,0) &&
7384               CAN_FALL(element) && WasJustFalling[x][y] &&
7385               (Feld[x][y + 1] == EL_BLOCKED || IS_PLAYER(x, y + 1))) ||
7386
7387              (game.engine_version < VERSION_IDENT(2,2,0,7) &&
7388               CAN_FALL(element) && WasJustMoving[x][y] && !Pushed[x][y + 1] &&
7389               (Feld[x][y + 1] == EL_BLOCKED)))
7390     {
7391       /* this is needed for a special case not covered by calling "Impact()"
7392          from "ContinueMoving()": if an element moves to a tile directly below
7393          another element which was just falling on that tile (which was empty
7394          in the previous frame), the falling element above would just stop
7395          instead of smashing the element below (in previous version, the above
7396          element was just checked for "moving" instead of "falling", resulting
7397          in incorrect smashes caused by horizontal movement of the above
7398          element; also, the case of the player being the element to smash was
7399          simply not covered here... :-/ ) */
7400
7401       CheckCollision[x][y] = 0;
7402       CheckImpact[x][y] = 0;
7403
7404       Impact(x, y);
7405     }
7406     else if (IS_FREE(x, y + 1) && element == EL_SPRING && level.use_spring_bug)
7407     {
7408       if (MovDir[x][y] == MV_NONE)
7409       {
7410         InitMovingField(x, y, MV_DOWN);
7411         started_moving = TRUE;
7412       }
7413     }
7414     else if (IS_FREE(x, y + 1) || Feld[x][y + 1] == EL_DIAMOND_BREAKING)
7415     {
7416       if (WasJustFalling[x][y]) /* prevent animation from being restarted */
7417         MovDir[x][y] = MV_DOWN;
7418
7419       InitMovingField(x, y, MV_DOWN);
7420       started_moving = TRUE;
7421     }
7422     else if (element == EL_AMOEBA_DROP)
7423     {
7424       Feld[x][y] = EL_AMOEBA_GROWING;
7425       Store[x][y] = EL_AMOEBA_WET;
7426     }
7427     else if (((IS_SLIPPERY(Feld[x][y + 1]) && !IS_PLAYER(x, y + 1)) ||
7428               (IS_EM_SLIPPERY_WALL(Feld[x][y + 1]) && IS_GEM(element))) &&
7429              !IS_FALLING(x, y + 1) && !WasJustMoving[x][y + 1] &&
7430              element != EL_DX_SUPABOMB && element != EL_SP_DISK_ORANGE)
7431     {
7432       boolean can_fall_left  = (x > 0 && IS_FREE(x - 1, y) &&
7433                                 (IS_FREE(x - 1, y + 1) ||
7434                                  Feld[x - 1][y + 1] == EL_ACID));
7435       boolean can_fall_right = (x < lev_fieldx - 1 && IS_FREE(x + 1, y) &&
7436                                 (IS_FREE(x + 1, y + 1) ||
7437                                  Feld[x + 1][y + 1] == EL_ACID));
7438       boolean can_fall_any  = (can_fall_left || can_fall_right);
7439       boolean can_fall_both = (can_fall_left && can_fall_right);
7440       int slippery_type = element_info[Feld[x][y + 1]].slippery_type;
7441
7442       if (can_fall_any && slippery_type != SLIPPERY_ANY_RANDOM)
7443       {
7444         if (slippery_type == SLIPPERY_ANY_LEFT_RIGHT && can_fall_both)
7445           can_fall_right = FALSE;
7446         else if (slippery_type == SLIPPERY_ANY_RIGHT_LEFT && can_fall_both)
7447           can_fall_left = FALSE;
7448         else if (slippery_type == SLIPPERY_ONLY_LEFT)
7449           can_fall_right = FALSE;
7450         else if (slippery_type == SLIPPERY_ONLY_RIGHT)
7451           can_fall_left = FALSE;
7452
7453         can_fall_any  = (can_fall_left || can_fall_right);
7454         can_fall_both = FALSE;
7455       }
7456
7457       if (can_fall_both)
7458       {
7459         if (element == EL_BD_ROCK || element == EL_BD_DIAMOND)
7460           can_fall_right = FALSE;       /* slip down on left side */
7461         else
7462           can_fall_left = !(can_fall_right = RND(2));
7463
7464         can_fall_both = FALSE;
7465       }
7466
7467       if (can_fall_any)
7468       {
7469         /* if not determined otherwise, prefer left side for slipping down */
7470         InitMovingField(x, y, can_fall_left ? MV_LEFT : MV_RIGHT);
7471         started_moving = TRUE;
7472       }
7473     }
7474     else if (IS_BELT_ACTIVE(Feld[x][y + 1]))
7475     {
7476       boolean left_is_free  = (x > 0 && IS_FREE(x - 1, y));
7477       boolean right_is_free = (x < lev_fieldx - 1 && IS_FREE(x + 1, y));
7478       int belt_nr = getBeltNrFromBeltActiveElement(Feld[x][y + 1]);
7479       int belt_dir = game.belt_dir[belt_nr];
7480
7481       if ((belt_dir == MV_LEFT  && left_is_free) ||
7482           (belt_dir == MV_RIGHT && right_is_free))
7483       {
7484         int nextx = (belt_dir == MV_LEFT ? x - 1 : x + 1);
7485
7486         InitMovingField(x, y, belt_dir);
7487         started_moving = TRUE;
7488
7489         Pushed[x][y] = TRUE;
7490         Pushed[nextx][y] = TRUE;
7491
7492         GfxAction[x][y] = ACTION_DEFAULT;
7493       }
7494       else
7495       {
7496         MovDir[x][y] = 0;       /* if element was moving, stop it */
7497       }
7498     }
7499   }
7500
7501   /* not "else if" because of elements that can fall and move (EL_SPRING) */
7502   if (CAN_MOVE(element) && !started_moving)
7503   {
7504     int move_pattern = element_info[element].move_pattern;
7505     int newx, newy;
7506
7507     Moving2Blocked(x, y, &newx, &newy);
7508
7509     if (IS_PUSHABLE(element) && JustBeingPushed(x, y))
7510       return;
7511
7512     if (game.engine_version >= VERSION_IDENT(3,1,0,0) &&
7513         CheckCollision[x][y] && !IN_LEV_FIELD_AND_IS_FREE(newx, newy))
7514     {
7515       WasJustMoving[x][y] = 0;
7516       CheckCollision[x][y] = 0;
7517
7518       TestIfElementHitsCustomElement(x, y, MovDir[x][y]);
7519
7520       if (Feld[x][y] != element)        /* element has changed */
7521         return;
7522     }
7523
7524     if (!MovDelay[x][y])        /* start new movement phase */
7525     {
7526       /* all objects that can change their move direction after each step
7527          (YAMYAM, DARK_YAMYAM and PACMAN go straight until they hit a wall */
7528
7529       if (element != EL_YAMYAM &&
7530           element != EL_DARK_YAMYAM &&
7531           element != EL_PACMAN &&
7532           !(move_pattern & MV_ANY_DIRECTION) &&
7533           move_pattern != MV_TURNING_LEFT &&
7534           move_pattern != MV_TURNING_RIGHT &&
7535           move_pattern != MV_TURNING_LEFT_RIGHT &&
7536           move_pattern != MV_TURNING_RIGHT_LEFT &&
7537           move_pattern != MV_TURNING_RANDOM)
7538       {
7539         TurnRound(x, y);
7540
7541         if (MovDelay[x][y] && (element == EL_BUG ||
7542                                element == EL_SPACESHIP ||
7543                                element == EL_SP_SNIKSNAK ||
7544                                element == EL_SP_ELECTRON ||
7545                                element == EL_MOLE))
7546           TEST_DrawLevelField(x, y);
7547       }
7548     }
7549
7550     if (MovDelay[x][y])         /* wait some time before next movement */
7551     {
7552       MovDelay[x][y]--;
7553
7554       if (element == EL_ROBOT ||
7555           element == EL_YAMYAM ||
7556           element == EL_DARK_YAMYAM)
7557       {
7558         DrawLevelElementAnimationIfNeeded(x, y, element);
7559         PlayLevelSoundAction(x, y, ACTION_WAITING);
7560       }
7561       else if (element == EL_SP_ELECTRON)
7562         DrawLevelElementAnimationIfNeeded(x, y, element);
7563       else if (element == EL_DRAGON)
7564       {
7565         int i;
7566         int dir = MovDir[x][y];
7567         int dx = (dir == MV_LEFT ? -1 : dir == MV_RIGHT ? +1 : 0);
7568         int dy = (dir == MV_UP   ? -1 : dir == MV_DOWN  ? +1 : 0);
7569         int graphic = (dir == MV_LEFT   ? IMG_FLAMES_1_LEFT :
7570                        dir == MV_RIGHT  ? IMG_FLAMES_1_RIGHT :
7571                        dir == MV_UP     ? IMG_FLAMES_1_UP :
7572                        dir == MV_DOWN   ? IMG_FLAMES_1_DOWN : IMG_EMPTY);
7573         int frame = getGraphicAnimationFrame(graphic, GfxFrame[x][y]);
7574
7575         GfxAction[x][y] = ACTION_ATTACKING;
7576
7577         if (IS_PLAYER(x, y))
7578           DrawPlayerField(x, y);
7579         else
7580           TEST_DrawLevelField(x, y);
7581
7582         PlayLevelSoundActionIfLoop(x, y, ACTION_ATTACKING);
7583
7584         for (i = 1; i <= 3; i++)
7585         {
7586           int xx = x + i * dx;
7587           int yy = y + i * dy;
7588           int sx = SCREENX(xx);
7589           int sy = SCREENY(yy);
7590           int flame_graphic = graphic + (i - 1);
7591
7592           if (!IN_LEV_FIELD(xx, yy) || IS_DRAGONFIRE_PROOF(Feld[xx][yy]))
7593             break;
7594
7595           if (MovDelay[x][y])
7596           {
7597             int flamed = MovingOrBlocked2Element(xx, yy);
7598
7599             if (IS_CLASSIC_ENEMY(flamed) || CAN_EXPLODE_BY_DRAGONFIRE(flamed))
7600               Bang(xx, yy);
7601             else
7602               RemoveMovingField(xx, yy);
7603
7604             ChangeDelay[xx][yy] = 0;
7605
7606             Feld[xx][yy] = EL_FLAMES;
7607
7608             if (IN_SCR_FIELD(sx, sy))
7609             {
7610               TEST_DrawLevelFieldCrumbled(xx, yy);
7611               DrawGraphic(sx, sy, flame_graphic, frame);
7612             }
7613           }
7614           else
7615           {
7616             if (Feld[xx][yy] == EL_FLAMES)
7617               Feld[xx][yy] = EL_EMPTY;
7618             TEST_DrawLevelField(xx, yy);
7619           }
7620         }
7621       }
7622
7623       if (MovDelay[x][y])       /* element still has to wait some time */
7624       {
7625         PlayLevelSoundAction(x, y, ACTION_WAITING);
7626
7627         return;
7628       }
7629     }
7630
7631     /* now make next step */
7632
7633     Moving2Blocked(x, y, &newx, &newy); /* get next screen position */
7634
7635     if (DONT_COLLIDE_WITH(element) &&
7636         IN_LEV_FIELD(newx, newy) && IS_PLAYER(newx, newy) &&
7637         !PLAYER_ENEMY_PROTECTED(newx, newy))
7638     {
7639       TestIfBadThingRunsIntoPlayer(x, y, MovDir[x][y]);
7640
7641       return;
7642     }
7643
7644     else if (CAN_MOVE_INTO_ACID(element) &&
7645              IN_LEV_FIELD(newx, newy) && Feld[newx][newy] == EL_ACID &&
7646              !IS_MV_DIAGONAL(MovDir[x][y]) &&
7647              (MovDir[x][y] == MV_DOWN ||
7648               game.engine_version >= VERSION_IDENT(3,1,0,0)))
7649     {
7650       SplashAcid(newx, newy);
7651       Store[x][y] = EL_ACID;
7652     }
7653     else if (element == EL_PENGUIN && IN_LEV_FIELD(newx, newy))
7654     {
7655       if (Feld[newx][newy] == EL_EXIT_OPEN ||
7656           Feld[newx][newy] == EL_EM_EXIT_OPEN ||
7657           Feld[newx][newy] == EL_STEEL_EXIT_OPEN ||
7658           Feld[newx][newy] == EL_EM_STEEL_EXIT_OPEN)
7659       {
7660         RemoveField(x, y);
7661         TEST_DrawLevelField(x, y);
7662
7663         PlayLevelSound(newx, newy, SND_PENGUIN_PASSING);
7664         if (IN_SCR_FIELD(SCREENX(newx), SCREENY(newy)))
7665           DrawGraphicThruMask(SCREENX(newx),SCREENY(newy), el2img(element), 0);
7666
7667         local_player->friends_still_needed--;
7668         if (!local_player->friends_still_needed &&
7669             !local_player->GameOver && AllPlayersGone)
7670           PlayerWins(local_player);
7671
7672         return;
7673       }
7674       else if (IS_FOOD_PENGUIN(Feld[newx][newy]))
7675       {
7676         if (DigField(local_player, x, y, newx, newy, 0,0, DF_DIG) == MP_MOVING)
7677           TEST_DrawLevelField(newx, newy);
7678         else
7679           GfxDir[x][y] = MovDir[x][y] = MV_NONE;
7680       }
7681       else if (!IS_FREE(newx, newy))
7682       {
7683         GfxAction[x][y] = ACTION_WAITING;
7684
7685         if (IS_PLAYER(x, y))
7686           DrawPlayerField(x, y);
7687         else
7688           TEST_DrawLevelField(x, y);
7689
7690         return;
7691       }
7692     }
7693     else if (element == EL_PIG && IN_LEV_FIELD(newx, newy))
7694     {
7695       if (IS_FOOD_PIG(Feld[newx][newy]))
7696       {
7697         if (IS_MOVING(newx, newy))
7698           RemoveMovingField(newx, newy);
7699         else
7700         {
7701           Feld[newx][newy] = EL_EMPTY;
7702           TEST_DrawLevelField(newx, newy);
7703         }
7704
7705         PlayLevelSound(x, y, SND_PIG_DIGGING);
7706       }
7707       else if (!IS_FREE(newx, newy))
7708       {
7709         if (IS_PLAYER(x, y))
7710           DrawPlayerField(x, y);
7711         else
7712           TEST_DrawLevelField(x, y);
7713
7714         return;
7715       }
7716     }
7717     else if (element == EL_EMC_ANDROID && IN_LEV_FIELD(newx, newy))
7718     {
7719       if (Store[x][y] != EL_EMPTY)
7720       {
7721         boolean can_clone = FALSE;
7722         int xx, yy;
7723
7724         /* check if element to clone is still there */
7725         for (yy = y - 1; yy <= y + 1; yy++) for (xx = x - 1; xx <= x + 1; xx++)
7726         {
7727           if (IN_LEV_FIELD(xx, yy) && Feld[xx][yy] == Store[x][y])
7728           {
7729             can_clone = TRUE;
7730
7731             break;
7732           }
7733         }
7734
7735         /* cannot clone or target field not free anymore -- do not clone */
7736         if (!can_clone || !ANDROID_CAN_ENTER_FIELD(element, newx, newy))
7737           Store[x][y] = EL_EMPTY;
7738       }
7739
7740       if (ANDROID_CAN_ENTER_FIELD(element, newx, newy))
7741       {
7742         if (IS_MV_DIAGONAL(MovDir[x][y]))
7743         {
7744           int diagonal_move_dir = MovDir[x][y];
7745           int stored = Store[x][y];
7746           int change_delay = 8;
7747           int graphic;
7748
7749           /* android is moving diagonally */
7750
7751           CreateField(x, y, EL_DIAGONAL_SHRINKING);
7752
7753           Store[x][y] = (stored == EL_ACID ? EL_EMPTY : stored);
7754           GfxElement[x][y] = EL_EMC_ANDROID;
7755           GfxAction[x][y] = ACTION_SHRINKING;
7756           GfxDir[x][y] = diagonal_move_dir;
7757           ChangeDelay[x][y] = change_delay;
7758
7759           graphic = el_act_dir2img(GfxElement[x][y], GfxAction[x][y],
7760                                    GfxDir[x][y]);
7761
7762           DrawLevelGraphicAnimation(x, y, graphic);
7763           PlayLevelSoundAction(x, y, ACTION_SHRINKING);
7764
7765           if (Feld[newx][newy] == EL_ACID)
7766           {
7767             SplashAcid(newx, newy);
7768
7769             return;
7770           }
7771
7772           CreateField(newx, newy, EL_DIAGONAL_GROWING);
7773
7774           Store[newx][newy] = EL_EMC_ANDROID;
7775           GfxElement[newx][newy] = EL_EMC_ANDROID;
7776           GfxAction[newx][newy] = ACTION_GROWING;
7777           GfxDir[newx][newy] = diagonal_move_dir;
7778           ChangeDelay[newx][newy] = change_delay;
7779
7780           graphic = el_act_dir2img(GfxElement[newx][newy],
7781                                    GfxAction[newx][newy], GfxDir[newx][newy]);
7782
7783           DrawLevelGraphicAnimation(newx, newy, graphic);
7784           PlayLevelSoundAction(newx, newy, ACTION_GROWING);
7785
7786           return;
7787         }
7788         else
7789         {
7790           Feld[newx][newy] = EL_EMPTY;
7791           TEST_DrawLevelField(newx, newy);
7792
7793           PlayLevelSoundAction(x, y, ACTION_DIGGING);
7794         }
7795       }
7796       else if (!IS_FREE(newx, newy))
7797       {
7798         return;
7799       }
7800     }
7801     else if (IS_CUSTOM_ELEMENT(element) &&
7802              CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, newx, newy))
7803     {
7804       if (!DigFieldByCE(newx, newy, element))
7805         return;
7806
7807       if (move_pattern & MV_MAZE_RUNNER_STYLE)
7808       {
7809         RunnerVisit[x][y] = FrameCounter;
7810         PlayerVisit[x][y] /= 8;         /* expire player visit path */
7811       }
7812     }
7813     else if (element == EL_DRAGON && IN_LEV_FIELD(newx, newy))
7814     {
7815       if (!IS_FREE(newx, newy))
7816       {
7817         if (IS_PLAYER(x, y))
7818           DrawPlayerField(x, y);
7819         else
7820           TEST_DrawLevelField(x, y);
7821
7822         return;
7823       }
7824       else
7825       {
7826         boolean wanna_flame = !RND(10);
7827         int dx = newx - x, dy = newy - y;
7828         int newx1 = newx + 1 * dx, newy1 = newy + 1 * dy;
7829         int newx2 = newx + 2 * dx, newy2 = newy + 2 * dy;
7830         int element1 = (IN_LEV_FIELD(newx1, newy1) ?
7831                         MovingOrBlocked2Element(newx1, newy1) : EL_STEELWALL);
7832         int element2 = (IN_LEV_FIELD(newx2, newy2) ?
7833                         MovingOrBlocked2Element(newx2, newy2) : EL_STEELWALL);
7834
7835         if ((wanna_flame ||
7836              IS_CLASSIC_ENEMY(element1) ||
7837              IS_CLASSIC_ENEMY(element2)) &&
7838             element1 != EL_DRAGON && element2 != EL_DRAGON &&
7839             element1 != EL_FLAMES && element2 != EL_FLAMES)
7840         {
7841           ResetGfxAnimation(x, y);
7842           GfxAction[x][y] = ACTION_ATTACKING;
7843
7844           if (IS_PLAYER(x, y))
7845             DrawPlayerField(x, y);
7846           else
7847             TEST_DrawLevelField(x, y);
7848
7849           PlayLevelSound(x, y, SND_DRAGON_ATTACKING);
7850
7851           MovDelay[x][y] = 50;
7852
7853           Feld[newx][newy] = EL_FLAMES;
7854           if (IN_LEV_FIELD(newx1, newy1) && Feld[newx1][newy1] == EL_EMPTY)
7855             Feld[newx1][newy1] = EL_FLAMES;
7856           if (IN_LEV_FIELD(newx2, newy2) && Feld[newx2][newy2] == EL_EMPTY)
7857             Feld[newx2][newy2] = EL_FLAMES;
7858
7859           return;
7860         }
7861       }
7862     }
7863     else if (element == EL_YAMYAM && IN_LEV_FIELD(newx, newy) &&
7864              Feld[newx][newy] == EL_DIAMOND)
7865     {
7866       if (IS_MOVING(newx, newy))
7867         RemoveMovingField(newx, newy);
7868       else
7869       {
7870         Feld[newx][newy] = EL_EMPTY;
7871         TEST_DrawLevelField(newx, newy);
7872       }
7873
7874       PlayLevelSound(x, y, SND_YAMYAM_DIGGING);
7875     }
7876     else if (element == EL_DARK_YAMYAM && IN_LEV_FIELD(newx, newy) &&
7877              IS_FOOD_DARK_YAMYAM(Feld[newx][newy]))
7878     {
7879       if (AmoebaNr[newx][newy])
7880       {
7881         AmoebaCnt2[AmoebaNr[newx][newy]]--;
7882         if (Feld[newx][newy] == EL_AMOEBA_FULL ||
7883             Feld[newx][newy] == EL_BD_AMOEBA)
7884           AmoebaCnt[AmoebaNr[newx][newy]]--;
7885       }
7886
7887       if (IS_MOVING(newx, newy))
7888       {
7889         RemoveMovingField(newx, newy);
7890       }
7891       else
7892       {
7893         Feld[newx][newy] = EL_EMPTY;
7894         TEST_DrawLevelField(newx, newy);
7895       }
7896
7897       PlayLevelSound(x, y, SND_DARK_YAMYAM_DIGGING);
7898     }
7899     else if ((element == EL_PACMAN || element == EL_MOLE)
7900              && IN_LEV_FIELD(newx, newy) && IS_AMOEBOID(Feld[newx][newy]))
7901     {
7902       if (AmoebaNr[newx][newy])
7903       {
7904         AmoebaCnt2[AmoebaNr[newx][newy]]--;
7905         if (Feld[newx][newy] == EL_AMOEBA_FULL ||
7906             Feld[newx][newy] == EL_BD_AMOEBA)
7907           AmoebaCnt[AmoebaNr[newx][newy]]--;
7908       }
7909
7910       if (element == EL_MOLE)
7911       {
7912         Feld[newx][newy] = EL_AMOEBA_SHRINKING;
7913         PlayLevelSound(x, y, SND_MOLE_DIGGING);
7914
7915         ResetGfxAnimation(x, y);
7916         GfxAction[x][y] = ACTION_DIGGING;
7917         TEST_DrawLevelField(x, y);
7918
7919         MovDelay[newx][newy] = 0;       /* start amoeba shrinking delay */
7920
7921         return;                         /* wait for shrinking amoeba */
7922       }
7923       else      /* element == EL_PACMAN */
7924       {
7925         Feld[newx][newy] = EL_EMPTY;
7926         TEST_DrawLevelField(newx, newy);
7927         PlayLevelSound(x, y, SND_PACMAN_DIGGING);
7928       }
7929     }
7930     else if (element == EL_MOLE && IN_LEV_FIELD(newx, newy) &&
7931              (Feld[newx][newy] == EL_AMOEBA_SHRINKING ||
7932               (Feld[newx][newy] == EL_EMPTY && Stop[newx][newy])))
7933     {
7934       /* wait for shrinking amoeba to completely disappear */
7935       return;
7936     }
7937     else if (!IN_LEV_FIELD(newx, newy) || !IS_FREE(newx, newy))
7938     {
7939       /* object was running against a wall */
7940
7941       TurnRound(x, y);
7942
7943       if (GFX_ELEMENT(element) != EL_SAND)     /* !!! FIX THIS (crumble) !!! */
7944         DrawLevelElementAnimation(x, y, element);
7945
7946       if (DONT_TOUCH(element))
7947         TestIfBadThingTouchesPlayer(x, y);
7948
7949       return;
7950     }
7951
7952     InitMovingField(x, y, MovDir[x][y]);
7953
7954     PlayLevelSoundAction(x, y, ACTION_MOVING);
7955   }
7956
7957   if (MovDir[x][y])
7958     ContinueMoving(x, y);
7959 }
7960
7961 void ContinueMoving(int x, int y)
7962 {
7963   int element = Feld[x][y];
7964   struct ElementInfo *ei = &element_info[element];
7965   int direction = MovDir[x][y];
7966   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
7967   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
7968   int newx = x + dx, newy = y + dy;
7969   int stored = Store[x][y];
7970   int stored_new = Store[newx][newy];
7971   boolean pushed_by_player   = (Pushed[x][y] && IS_PLAYER(x, y));
7972   boolean pushed_by_conveyor = (Pushed[x][y] && !IS_PLAYER(x, y));
7973   boolean last_line = (newy == lev_fieldy - 1);
7974
7975   MovPos[x][y] += getElementMoveStepsize(x, y);
7976
7977   if (pushed_by_player) /* special case: moving object pushed by player */
7978     MovPos[x][y] = SIGN(MovPos[x][y]) * (TILEX - ABS(PLAYERINFO(x,y)->MovPos));
7979
7980   if (ABS(MovPos[x][y]) < TILEX)
7981   {
7982     TEST_DrawLevelField(x, y);
7983
7984     return;     /* element is still moving */
7985   }
7986
7987   /* element reached destination field */
7988
7989   Feld[x][y] = EL_EMPTY;
7990   Feld[newx][newy] = element;
7991   MovPos[x][y] = 0;     /* force "not moving" for "crumbled sand" */
7992
7993   if (Store[x][y] == EL_ACID)   /* element is moving into acid pool */
7994   {
7995     element = Feld[newx][newy] = EL_ACID;
7996   }
7997   else if (element == EL_MOLE)
7998   {
7999     Feld[x][y] = EL_SAND;
8000
8001     TEST_DrawLevelFieldCrumbledNeighbours(x, y);
8002   }
8003   else if (element == EL_QUICKSAND_FILLING)
8004   {
8005     element = Feld[newx][newy] = get_next_element(element);
8006     Store[newx][newy] = Store[x][y];
8007   }
8008   else if (element == EL_QUICKSAND_EMPTYING)
8009   {
8010     Feld[x][y] = get_next_element(element);
8011     element = Feld[newx][newy] = Store[x][y];
8012   }
8013   else if (element == EL_QUICKSAND_FAST_FILLING)
8014   {
8015     element = Feld[newx][newy] = get_next_element(element);
8016     Store[newx][newy] = Store[x][y];
8017   }
8018   else if (element == EL_QUICKSAND_FAST_EMPTYING)
8019   {
8020     Feld[x][y] = get_next_element(element);
8021     element = Feld[newx][newy] = Store[x][y];
8022   }
8023   else if (element == EL_MAGIC_WALL_FILLING)
8024   {
8025     element = Feld[newx][newy] = get_next_element(element);
8026     if (!game.magic_wall_active)
8027       element = Feld[newx][newy] = EL_MAGIC_WALL_DEAD;
8028     Store[newx][newy] = Store[x][y];
8029   }
8030   else if (element == EL_MAGIC_WALL_EMPTYING)
8031   {
8032     Feld[x][y] = get_next_element(element);
8033     if (!game.magic_wall_active)
8034       Feld[x][y] = EL_MAGIC_WALL_DEAD;
8035     element = Feld[newx][newy] = Store[x][y];
8036
8037     InitField(newx, newy, FALSE);
8038   }
8039   else if (element == EL_BD_MAGIC_WALL_FILLING)
8040   {
8041     element = Feld[newx][newy] = get_next_element(element);
8042     if (!game.magic_wall_active)
8043       element = Feld[newx][newy] = EL_BD_MAGIC_WALL_DEAD;
8044     Store[newx][newy] = Store[x][y];
8045   }
8046   else if (element == EL_BD_MAGIC_WALL_EMPTYING)
8047   {
8048     Feld[x][y] = get_next_element(element);
8049     if (!game.magic_wall_active)
8050       Feld[x][y] = EL_BD_MAGIC_WALL_DEAD;
8051     element = Feld[newx][newy] = Store[x][y];
8052
8053     InitField(newx, newy, FALSE);
8054   }
8055   else if (element == EL_DC_MAGIC_WALL_FILLING)
8056   {
8057     element = Feld[newx][newy] = get_next_element(element);
8058     if (!game.magic_wall_active)
8059       element = Feld[newx][newy] = EL_DC_MAGIC_WALL_DEAD;
8060     Store[newx][newy] = Store[x][y];
8061   }
8062   else if (element == EL_DC_MAGIC_WALL_EMPTYING)
8063   {
8064     Feld[x][y] = get_next_element(element);
8065     if (!game.magic_wall_active)
8066       Feld[x][y] = EL_DC_MAGIC_WALL_DEAD;
8067     element = Feld[newx][newy] = Store[x][y];
8068
8069     InitField(newx, newy, FALSE);
8070   }
8071   else if (element == EL_AMOEBA_DROPPING)
8072   {
8073     Feld[x][y] = get_next_element(element);
8074     element = Feld[newx][newy] = Store[x][y];
8075   }
8076   else if (element == EL_SOKOBAN_OBJECT)
8077   {
8078     if (Back[x][y])
8079       Feld[x][y] = Back[x][y];
8080
8081     if (Back[newx][newy])
8082       Feld[newx][newy] = EL_SOKOBAN_FIELD_FULL;
8083
8084     Back[x][y] = Back[newx][newy] = 0;
8085   }
8086
8087   Store[x][y] = EL_EMPTY;
8088   MovPos[x][y] = 0;
8089   MovDir[x][y] = 0;
8090   MovDelay[x][y] = 0;
8091
8092   MovDelay[newx][newy] = 0;
8093
8094   if (CAN_CHANGE_OR_HAS_ACTION(element))
8095   {
8096     /* copy element change control values to new field */
8097     ChangeDelay[newx][newy] = ChangeDelay[x][y];
8098     ChangePage[newx][newy]  = ChangePage[x][y];
8099     ChangeCount[newx][newy] = ChangeCount[x][y];
8100     ChangeEvent[newx][newy] = ChangeEvent[x][y];
8101   }
8102
8103   CustomValue[newx][newy] = CustomValue[x][y];
8104
8105   ChangeDelay[x][y] = 0;
8106   ChangePage[x][y] = -1;
8107   ChangeCount[x][y] = 0;
8108   ChangeEvent[x][y] = -1;
8109
8110   CustomValue[x][y] = 0;
8111
8112   /* copy animation control values to new field */
8113   GfxFrame[newx][newy]  = GfxFrame[x][y];
8114   GfxRandom[newx][newy] = GfxRandom[x][y];      /* keep same random value */
8115   GfxAction[newx][newy] = GfxAction[x][y];      /* keep action one frame  */
8116   GfxDir[newx][newy]    = GfxDir[x][y];         /* keep element direction */
8117
8118   Pushed[x][y] = Pushed[newx][newy] = FALSE;
8119
8120   /* some elements can leave other elements behind after moving */
8121   if (ei->move_leave_element != EL_EMPTY &&
8122       (ei->move_leave_type == LEAVE_TYPE_UNLIMITED || stored != EL_EMPTY) &&
8123       (!IS_PLAYER(x, y) || IS_WALKABLE(ei->move_leave_element)))
8124   {
8125     int move_leave_element = ei->move_leave_element;
8126
8127     /* this makes it possible to leave the removed element again */
8128     if (ei->move_leave_element == EL_TRIGGER_ELEMENT)
8129       move_leave_element = (stored == EL_ACID ? EL_EMPTY : stored);
8130
8131     Feld[x][y] = move_leave_element;
8132
8133     if (element_info[Feld[x][y]].move_direction_initial == MV_START_PREVIOUS)
8134       MovDir[x][y] = direction;
8135
8136     InitField(x, y, FALSE);
8137
8138     if (GFX_CRUMBLED(Feld[x][y]))
8139       TEST_DrawLevelFieldCrumbledNeighbours(x, y);
8140
8141     if (ELEM_IS_PLAYER(move_leave_element))
8142       RelocatePlayer(x, y, move_leave_element);
8143   }
8144
8145   /* do this after checking for left-behind element */
8146   ResetGfxAnimation(x, y);      /* reset animation values for old field */
8147
8148   if (!CAN_MOVE(element) ||
8149       (CAN_FALL(element) && direction == MV_DOWN &&
8150        (element == EL_SPRING ||
8151         element_info[element].move_pattern == MV_WHEN_PUSHED ||
8152         element_info[element].move_pattern == MV_WHEN_DROPPED)))
8153     GfxDir[x][y] = MovDir[newx][newy] = 0;
8154
8155   TEST_DrawLevelField(x, y);
8156   TEST_DrawLevelField(newx, newy);
8157
8158   Stop[newx][newy] = TRUE;      /* ignore this element until the next frame */
8159
8160   /* prevent pushed element from moving on in pushed direction */
8161   if (pushed_by_player && CAN_MOVE(element) &&
8162       element_info[element].move_pattern & MV_ANY_DIRECTION &&
8163       !(element_info[element].move_pattern & direction))
8164     TurnRound(newx, newy);
8165
8166   /* prevent elements on conveyor belt from moving on in last direction */
8167   if (pushed_by_conveyor && CAN_FALL(element) &&
8168       direction & MV_HORIZONTAL)
8169     MovDir[newx][newy] = 0;
8170
8171   if (!pushed_by_player)
8172   {
8173     int nextx = newx + dx, nexty = newy + dy;
8174     boolean check_collision_again = IN_LEV_FIELD_AND_IS_FREE(nextx, nexty);
8175
8176     WasJustMoving[newx][newy] = CHECK_DELAY_MOVING;
8177
8178     if (CAN_FALL(element) && direction == MV_DOWN)
8179       WasJustFalling[newx][newy] = CHECK_DELAY_FALLING;
8180
8181     if ((!CAN_FALL(element) || direction == MV_DOWN) && check_collision_again)
8182       CheckCollision[newx][newy] = CHECK_DELAY_COLLISION;
8183
8184     if (CAN_FALL(element) && direction == MV_DOWN && check_collision_again)
8185       CheckImpact[newx][newy] = CHECK_DELAY_IMPACT;
8186   }
8187
8188   if (DONT_TOUCH(element))      /* object may be nasty to player or others */
8189   {
8190     TestIfBadThingTouchesPlayer(newx, newy);
8191     TestIfBadThingTouchesFriend(newx, newy);
8192
8193     if (!IS_CUSTOM_ELEMENT(element))
8194       TestIfBadThingTouchesOtherBadThing(newx, newy);
8195   }
8196   else if (element == EL_PENGUIN)
8197     TestIfFriendTouchesBadThing(newx, newy);
8198
8199   if (DONT_GET_HIT_BY(element))
8200   {
8201     TestIfGoodThingGetsHitByBadThing(newx, newy, direction);
8202   }
8203
8204   /* give the player one last chance (one more frame) to move away */
8205   if (CAN_FALL(element) && direction == MV_DOWN &&
8206       (last_line || (!IS_FREE(x, newy + 1) &&
8207                      (!IS_PLAYER(x, newy + 1) ||
8208                       game.engine_version < VERSION_IDENT(3,1,1,0)))))
8209     Impact(x, newy);
8210
8211   if (pushed_by_player && !game.use_change_when_pushing_bug)
8212   {
8213     int push_side = MV_DIR_OPPOSITE(direction);
8214     struct PlayerInfo *player = PLAYERINFO(x, y);
8215
8216     CheckElementChangeByPlayer(newx, newy, element, CE_PUSHED_BY_PLAYER,
8217                                player->index_bit, push_side);
8218     CheckTriggeredElementChangeByPlayer(newx,newy, element, CE_PLAYER_PUSHES_X,
8219                                         player->index_bit, push_side);
8220   }
8221
8222   if (element == EL_EMC_ANDROID && pushed_by_player)    /* make another move */
8223     MovDelay[newx][newy] = 1;
8224
8225   CheckTriggeredElementChangeBySide(x, y, element, CE_MOVE_OF_X, direction);
8226
8227   TestIfElementTouchesCustomElement(x, y);      /* empty or new element */
8228   TestIfElementHitsCustomElement(newx, newy, direction);
8229   TestIfPlayerTouchesCustomElement(newx, newy);
8230   TestIfElementTouchesCustomElement(newx, newy);
8231
8232   if (IS_CUSTOM_ELEMENT(element) && ei->move_enter_element != EL_EMPTY &&
8233       IS_EQUAL_OR_IN_GROUP(stored_new, ei->move_enter_element))
8234     CheckElementChangeBySide(newx, newy, element, stored_new, CE_DIGGING_X,
8235                              MV_DIR_OPPOSITE(direction));
8236 }
8237
8238 int AmoebeNachbarNr(int ax, int ay)
8239 {
8240   int i;
8241   int element = Feld[ax][ay];
8242   int group_nr = 0;
8243   static int xy[4][2] =
8244   {
8245     { 0, -1 },
8246     { -1, 0 },
8247     { +1, 0 },
8248     { 0, +1 }
8249   };
8250
8251   for (i = 0; i < NUM_DIRECTIONS; i++)
8252   {
8253     int x = ax + xy[i][0];
8254     int y = ay + xy[i][1];
8255
8256     if (!IN_LEV_FIELD(x, y))
8257       continue;
8258
8259     if (Feld[x][y] == element && AmoebaNr[x][y] > 0)
8260       group_nr = AmoebaNr[x][y];
8261   }
8262
8263   return group_nr;
8264 }
8265
8266 void AmoebenVereinigen(int ax, int ay)
8267 {
8268   int i, x, y, xx, yy;
8269   int new_group_nr = AmoebaNr[ax][ay];
8270   static int xy[4][2] =
8271   {
8272     { 0, -1 },
8273     { -1, 0 },
8274     { +1, 0 },
8275     { 0, +1 }
8276   };
8277
8278   if (new_group_nr == 0)
8279     return;
8280
8281   for (i = 0; i < NUM_DIRECTIONS; i++)
8282   {
8283     x = ax + xy[i][0];
8284     y = ay + xy[i][1];
8285
8286     if (!IN_LEV_FIELD(x, y))
8287       continue;
8288
8289     if ((Feld[x][y] == EL_AMOEBA_FULL ||
8290          Feld[x][y] == EL_BD_AMOEBA ||
8291          Feld[x][y] == EL_AMOEBA_DEAD) &&
8292         AmoebaNr[x][y] != new_group_nr)
8293     {
8294       int old_group_nr = AmoebaNr[x][y];
8295
8296       if (old_group_nr == 0)
8297         return;
8298
8299       AmoebaCnt[new_group_nr] += AmoebaCnt[old_group_nr];
8300       AmoebaCnt[old_group_nr] = 0;
8301       AmoebaCnt2[new_group_nr] += AmoebaCnt2[old_group_nr];
8302       AmoebaCnt2[old_group_nr] = 0;
8303
8304       SCAN_PLAYFIELD(xx, yy)
8305       {
8306         if (AmoebaNr[xx][yy] == old_group_nr)
8307           AmoebaNr[xx][yy] = new_group_nr;
8308       }
8309     }
8310   }
8311 }
8312
8313 void AmoebeUmwandeln(int ax, int ay)
8314 {
8315   int i, x, y;
8316
8317   if (Feld[ax][ay] == EL_AMOEBA_DEAD)
8318   {
8319     int group_nr = AmoebaNr[ax][ay];
8320
8321 #ifdef DEBUG
8322     if (group_nr == 0)
8323     {
8324       printf("AmoebeUmwandeln(): ax = %d, ay = %d\n", ax, ay);
8325       printf("AmoebeUmwandeln(): This should never happen!\n");
8326       return;
8327     }
8328 #endif
8329
8330     SCAN_PLAYFIELD(x, y)
8331     {
8332       if (Feld[x][y] == EL_AMOEBA_DEAD && AmoebaNr[x][y] == group_nr)
8333       {
8334         AmoebaNr[x][y] = 0;
8335         Feld[x][y] = EL_AMOEBA_TO_DIAMOND;
8336       }
8337     }
8338
8339     PlayLevelSound(ax, ay, (IS_GEM(level.amoeba_content) ?
8340                             SND_AMOEBA_TURNING_TO_GEM :
8341                             SND_AMOEBA_TURNING_TO_ROCK));
8342     Bang(ax, ay);
8343   }
8344   else
8345   {
8346     static int xy[4][2] =
8347     {
8348       { 0, -1 },
8349       { -1, 0 },
8350       { +1, 0 },
8351       { 0, +1 }
8352     };
8353
8354     for (i = 0; i < NUM_DIRECTIONS; i++)
8355     {
8356       x = ax + xy[i][0];
8357       y = ay + xy[i][1];
8358
8359       if (!IN_LEV_FIELD(x, y))
8360         continue;
8361
8362       if (Feld[x][y] == EL_AMOEBA_TO_DIAMOND)
8363       {
8364         PlayLevelSound(x, y, (IS_GEM(level.amoeba_content) ?
8365                               SND_AMOEBA_TURNING_TO_GEM :
8366                               SND_AMOEBA_TURNING_TO_ROCK));
8367         Bang(x, y);
8368       }
8369     }
8370   }
8371 }
8372
8373 void AmoebeUmwandelnBD(int ax, int ay, int new_element)
8374 {
8375   int x, y;
8376   int group_nr = AmoebaNr[ax][ay];
8377   boolean done = FALSE;
8378
8379 #ifdef DEBUG
8380   if (group_nr == 0)
8381   {
8382     printf("AmoebeUmwandelnBD(): ax = %d, ay = %d\n", ax, ay);
8383     printf("AmoebeUmwandelnBD(): This should never happen!\n");
8384     return;
8385   }
8386 #endif
8387
8388   SCAN_PLAYFIELD(x, y)
8389   {
8390     if (AmoebaNr[x][y] == group_nr &&
8391         (Feld[x][y] == EL_AMOEBA_DEAD ||
8392          Feld[x][y] == EL_BD_AMOEBA ||
8393          Feld[x][y] == EL_AMOEBA_GROWING))
8394     {
8395       AmoebaNr[x][y] = 0;
8396       Feld[x][y] = new_element;
8397       InitField(x, y, FALSE);
8398       TEST_DrawLevelField(x, y);
8399       done = TRUE;
8400     }
8401   }
8402
8403   if (done)
8404     PlayLevelSound(ax, ay, (new_element == EL_BD_ROCK ?
8405                             SND_BD_AMOEBA_TURNING_TO_ROCK :
8406                             SND_BD_AMOEBA_TURNING_TO_GEM));
8407 }
8408
8409 void AmoebeWaechst(int x, int y)
8410 {
8411   static unsigned int sound_delay = 0;
8412   static unsigned int sound_delay_value = 0;
8413
8414   if (!MovDelay[x][y])          /* start new growing cycle */
8415   {
8416     MovDelay[x][y] = 7;
8417
8418     if (DelayReached(&sound_delay, sound_delay_value))
8419     {
8420       PlayLevelSoundElementAction(x, y, Store[x][y], ACTION_GROWING);
8421       sound_delay_value = 30;
8422     }
8423   }
8424
8425   if (MovDelay[x][y])           /* wait some time before growing bigger */
8426   {
8427     MovDelay[x][y]--;
8428     if (MovDelay[x][y]/2 && IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
8429     {
8430       int frame = getGraphicAnimationFrame(IMG_AMOEBA_GROWING,
8431                                            6 - MovDelay[x][y]);
8432
8433       DrawGraphic(SCREENX(x), SCREENY(y), IMG_AMOEBA_GROWING, frame);
8434     }
8435
8436     if (!MovDelay[x][y])
8437     {
8438       Feld[x][y] = Store[x][y];
8439       Store[x][y] = 0;
8440       TEST_DrawLevelField(x, y);
8441     }
8442   }
8443 }
8444
8445 void AmoebaDisappearing(int x, int y)
8446 {
8447   static unsigned int sound_delay = 0;
8448   static unsigned int sound_delay_value = 0;
8449
8450   if (!MovDelay[x][y])          /* start new shrinking cycle */
8451   {
8452     MovDelay[x][y] = 7;
8453
8454     if (DelayReached(&sound_delay, sound_delay_value))
8455       sound_delay_value = 30;
8456   }
8457
8458   if (MovDelay[x][y])           /* wait some time before shrinking */
8459   {
8460     MovDelay[x][y]--;
8461     if (MovDelay[x][y]/2 && IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
8462     {
8463       int frame = getGraphicAnimationFrame(IMG_AMOEBA_SHRINKING,
8464                                            6 - MovDelay[x][y]);
8465
8466       DrawGraphic(SCREENX(x), SCREENY(y), IMG_AMOEBA_SHRINKING, frame);
8467     }
8468
8469     if (!MovDelay[x][y])
8470     {
8471       Feld[x][y] = EL_EMPTY;
8472       TEST_DrawLevelField(x, y);
8473
8474       /* don't let mole enter this field in this cycle;
8475          (give priority to objects falling to this field from above) */
8476       Stop[x][y] = TRUE;
8477     }
8478   }
8479 }
8480
8481 void AmoebeAbleger(int ax, int ay)
8482 {
8483   int i;
8484   int element = Feld[ax][ay];
8485   int graphic = el2img(element);
8486   int newax = ax, neway = ay;
8487   boolean can_drop = (element == EL_AMOEBA_WET || element == EL_EMC_DRIPPER);
8488   static int xy[4][2] =
8489   {
8490     { 0, -1 },
8491     { -1, 0 },
8492     { +1, 0 },
8493     { 0, +1 }
8494   };
8495
8496   if (!level.amoeba_speed && element != EL_EMC_DRIPPER)
8497   {
8498     Feld[ax][ay] = EL_AMOEBA_DEAD;
8499     TEST_DrawLevelField(ax, ay);
8500     return;
8501   }
8502
8503   if (IS_ANIMATED(graphic))
8504     DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
8505
8506   if (!MovDelay[ax][ay])        /* start making new amoeba field */
8507     MovDelay[ax][ay] = RND(FRAMES_PER_SECOND * 25 / (1 + level.amoeba_speed));
8508
8509   if (MovDelay[ax][ay])         /* wait some time before making new amoeba */
8510   {
8511     MovDelay[ax][ay]--;
8512     if (MovDelay[ax][ay])
8513       return;
8514   }
8515
8516   if (can_drop)                 /* EL_AMOEBA_WET or EL_EMC_DRIPPER */
8517   {
8518     int start = RND(4);
8519     int x = ax + xy[start][0];
8520     int y = ay + xy[start][1];
8521
8522     if (!IN_LEV_FIELD(x, y))
8523       return;
8524
8525     if (IS_FREE(x, y) ||
8526         CAN_GROW_INTO(Feld[x][y]) ||
8527         Feld[x][y] == EL_QUICKSAND_EMPTY ||
8528         Feld[x][y] == EL_QUICKSAND_FAST_EMPTY)
8529     {
8530       newax = x;
8531       neway = y;
8532     }
8533
8534     if (newax == ax && neway == ay)
8535       return;
8536   }
8537   else                          /* normal or "filled" (BD style) amoeba */
8538   {
8539     int start = RND(4);
8540     boolean waiting_for_player = FALSE;
8541
8542     for (i = 0; i < NUM_DIRECTIONS; i++)
8543     {
8544       int j = (start + i) % 4;
8545       int x = ax + xy[j][0];
8546       int y = ay + xy[j][1];
8547
8548       if (!IN_LEV_FIELD(x, y))
8549         continue;
8550
8551       if (IS_FREE(x, y) ||
8552           CAN_GROW_INTO(Feld[x][y]) ||
8553           Feld[x][y] == EL_QUICKSAND_EMPTY ||
8554           Feld[x][y] == EL_QUICKSAND_FAST_EMPTY)
8555       {
8556         newax = x;
8557         neway = y;
8558         break;
8559       }
8560       else if (IS_PLAYER(x, y))
8561         waiting_for_player = TRUE;
8562     }
8563
8564     if (newax == ax && neway == ay)             /* amoeba cannot grow */
8565     {
8566       if (i == 4 && (!waiting_for_player || element == EL_BD_AMOEBA))
8567       {
8568         Feld[ax][ay] = EL_AMOEBA_DEAD;
8569         TEST_DrawLevelField(ax, ay);
8570         AmoebaCnt[AmoebaNr[ax][ay]]--;
8571
8572         if (AmoebaCnt[AmoebaNr[ax][ay]] <= 0)   /* amoeba is completely dead */
8573         {
8574           if (element == EL_AMOEBA_FULL)
8575             AmoebeUmwandeln(ax, ay);
8576           else if (element == EL_BD_AMOEBA)
8577             AmoebeUmwandelnBD(ax, ay, level.amoeba_content);
8578         }
8579       }
8580       return;
8581     }
8582     else if (element == EL_AMOEBA_FULL || element == EL_BD_AMOEBA)
8583     {
8584       /* amoeba gets larger by growing in some direction */
8585
8586       int new_group_nr = AmoebaNr[ax][ay];
8587
8588 #ifdef DEBUG
8589   if (new_group_nr == 0)
8590   {
8591     printf("AmoebeAbleger(): newax = %d, neway = %d\n", newax, neway);
8592     printf("AmoebeAbleger(): This should never happen!\n");
8593     return;
8594   }
8595 #endif
8596
8597       AmoebaNr[newax][neway] = new_group_nr;
8598       AmoebaCnt[new_group_nr]++;
8599       AmoebaCnt2[new_group_nr]++;
8600
8601       /* if amoeba touches other amoeba(s) after growing, unify them */
8602       AmoebenVereinigen(newax, neway);
8603
8604       if (element == EL_BD_AMOEBA && AmoebaCnt2[new_group_nr] >= 200)
8605       {
8606         AmoebeUmwandelnBD(newax, neway, EL_BD_ROCK);
8607         return;
8608       }
8609     }
8610   }
8611
8612   if (!can_drop || neway < ay || !IS_FREE(newax, neway) ||
8613       (neway == lev_fieldy - 1 && newax != ax))
8614   {
8615     Feld[newax][neway] = EL_AMOEBA_GROWING;     /* creation of new amoeba */
8616     Store[newax][neway] = element;
8617   }
8618   else if (neway == ay || element == EL_EMC_DRIPPER)
8619   {
8620     Feld[newax][neway] = EL_AMOEBA_DROP;        /* drop left/right of amoeba */
8621
8622     PlayLevelSoundAction(newax, neway, ACTION_GROWING);
8623   }
8624   else
8625   {
8626     InitMovingField(ax, ay, MV_DOWN);           /* drop dripping from amoeba */
8627     Feld[ax][ay] = EL_AMOEBA_DROPPING;
8628     Store[ax][ay] = EL_AMOEBA_DROP;
8629     ContinueMoving(ax, ay);
8630     return;
8631   }
8632
8633   TEST_DrawLevelField(newax, neway);
8634 }
8635
8636 void Life(int ax, int ay)
8637 {
8638   int x1, y1, x2, y2;
8639   int life_time = 40;
8640   int element = Feld[ax][ay];
8641   int graphic = el2img(element);
8642   int *life_parameter = (element == EL_GAME_OF_LIFE ? level.game_of_life :
8643                          level.biomaze);
8644   boolean changed = FALSE;
8645
8646   if (IS_ANIMATED(graphic))
8647     DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
8648
8649   if (Stop[ax][ay])
8650     return;
8651
8652   if (!MovDelay[ax][ay])        /* start new "game of life" cycle */
8653     MovDelay[ax][ay] = life_time;
8654
8655   if (MovDelay[ax][ay])         /* wait some time before next cycle */
8656   {
8657     MovDelay[ax][ay]--;
8658     if (MovDelay[ax][ay])
8659       return;
8660   }
8661
8662   for (y1 = -1; y1 < 2; y1++) for (x1 = -1; x1 < 2; x1++)
8663   {
8664     int xx = ax+x1, yy = ay+y1;
8665     int nachbarn = 0;
8666
8667     if (!IN_LEV_FIELD(xx, yy))
8668       continue;
8669
8670     for (y2 = -1; y2 < 2; y2++) for (x2 = -1; x2 < 2; x2++)
8671     {
8672       int x = xx+x2, y = yy+y2;
8673
8674       if (!IN_LEV_FIELD(x, y) || (x == xx && y == yy))
8675         continue;
8676
8677       if (((Feld[x][y] == element ||
8678             (element == EL_GAME_OF_LIFE && IS_PLAYER(x, y))) &&
8679            !Stop[x][y]) ||
8680           (IS_FREE(x, y) && Stop[x][y]))
8681         nachbarn++;
8682     }
8683
8684     if (xx == ax && yy == ay)           /* field in the middle */
8685     {
8686       if (nachbarn < life_parameter[0] ||
8687           nachbarn > life_parameter[1])
8688       {
8689         Feld[xx][yy] = EL_EMPTY;
8690         if (!Stop[xx][yy])
8691           TEST_DrawLevelField(xx, yy);
8692         Stop[xx][yy] = TRUE;
8693         changed = TRUE;
8694       }
8695     }
8696     else if (IS_FREE(xx, yy) || CAN_GROW_INTO(Feld[xx][yy]))
8697     {                                   /* free border field */
8698       if (nachbarn >= life_parameter[2] &&
8699           nachbarn <= life_parameter[3])
8700       {
8701         Feld[xx][yy] = element;
8702         MovDelay[xx][yy] = (element == EL_GAME_OF_LIFE ? 0 : life_time-1);
8703         if (!Stop[xx][yy])
8704           TEST_DrawLevelField(xx, yy);
8705         Stop[xx][yy] = TRUE;
8706         changed = TRUE;
8707       }
8708     }
8709   }
8710
8711   if (changed)
8712     PlayLevelSound(ax, ay, element == EL_BIOMAZE ? SND_BIOMAZE_GROWING :
8713                    SND_GAME_OF_LIFE_GROWING);
8714 }
8715
8716 static void InitRobotWheel(int x, int y)
8717 {
8718   ChangeDelay[x][y] = level.time_wheel * FRAMES_PER_SECOND;
8719 }
8720
8721 static void RunRobotWheel(int x, int y)
8722 {
8723   PlayLevelSound(x, y, SND_ROBOT_WHEEL_ACTIVE);
8724 }
8725
8726 static void StopRobotWheel(int x, int y)
8727 {
8728   if (ZX == x && ZY == y)
8729   {
8730     ZX = ZY = -1;
8731
8732     game.robot_wheel_active = FALSE;
8733   }
8734 }
8735
8736 static void InitTimegateWheel(int x, int y)
8737 {
8738   ChangeDelay[x][y] = level.time_timegate * FRAMES_PER_SECOND;
8739 }
8740
8741 static void RunTimegateWheel(int x, int y)
8742 {
8743   PlayLevelSound(x, y, SND_CLASS_TIMEGATE_SWITCH_ACTIVE);
8744 }
8745
8746 static void InitMagicBallDelay(int x, int y)
8747 {
8748   ChangeDelay[x][y] = (level.ball_time + 1) * 8 + 1;
8749 }
8750
8751 static void ActivateMagicBall(int bx, int by)
8752 {
8753   int x, y;
8754
8755   if (level.ball_random)
8756   {
8757     int pos_border = RND(8);    /* select one of the eight border elements */
8758     int pos_content = (pos_border > 3 ? pos_border + 1 : pos_border);
8759     int xx = pos_content % 3;
8760     int yy = pos_content / 3;
8761
8762     x = bx - 1 + xx;
8763     y = by - 1 + yy;
8764
8765     if (IN_LEV_FIELD(x, y) && Feld[x][y] == EL_EMPTY)
8766       CreateField(x, y, level.ball_content[game.ball_content_nr].e[xx][yy]);
8767   }
8768   else
8769   {
8770     for (y = by - 1; y <= by + 1; y++) for (x = bx - 1; x <= bx + 1; x++)
8771     {
8772       int xx = x - bx + 1;
8773       int yy = y - by + 1;
8774
8775       if (IN_LEV_FIELD(x, y) && Feld[x][y] == EL_EMPTY)
8776         CreateField(x, y, level.ball_content[game.ball_content_nr].e[xx][yy]);
8777     }
8778   }
8779
8780   game.ball_content_nr = (game.ball_content_nr + 1) % level.num_ball_contents;
8781 }
8782
8783 void CheckExit(int x, int y)
8784 {
8785   if (local_player->gems_still_needed > 0 ||
8786       local_player->sokobanfields_still_needed > 0 ||
8787       local_player->lights_still_needed > 0)
8788   {
8789     int element = Feld[x][y];
8790     int graphic = el2img(element);
8791
8792     if (IS_ANIMATED(graphic))
8793       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
8794
8795     return;
8796   }
8797
8798   if (AllPlayersGone)   /* do not re-open exit door closed after last player */
8799     return;
8800
8801   Feld[x][y] = EL_EXIT_OPENING;
8802
8803   PlayLevelSoundNearest(x, y, SND_CLASS_EXIT_OPENING);
8804 }
8805
8806 void CheckExitEM(int x, int y)
8807 {
8808   if (local_player->gems_still_needed > 0 ||
8809       local_player->sokobanfields_still_needed > 0 ||
8810       local_player->lights_still_needed > 0)
8811   {
8812     int element = Feld[x][y];
8813     int graphic = el2img(element);
8814
8815     if (IS_ANIMATED(graphic))
8816       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
8817
8818     return;
8819   }
8820
8821   if (AllPlayersGone)   /* do not re-open exit door closed after last player */
8822     return;
8823
8824   Feld[x][y] = EL_EM_EXIT_OPENING;
8825
8826   PlayLevelSoundNearest(x, y, SND_CLASS_EM_EXIT_OPENING);
8827 }
8828
8829 void CheckExitSteel(int x, int y)
8830 {
8831   if (local_player->gems_still_needed > 0 ||
8832       local_player->sokobanfields_still_needed > 0 ||
8833       local_player->lights_still_needed > 0)
8834   {
8835     int element = Feld[x][y];
8836     int graphic = el2img(element);
8837
8838     if (IS_ANIMATED(graphic))
8839       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
8840
8841     return;
8842   }
8843
8844   if (AllPlayersGone)   /* do not re-open exit door closed after last player */
8845     return;
8846
8847   Feld[x][y] = EL_STEEL_EXIT_OPENING;
8848
8849   PlayLevelSoundNearest(x, y, SND_CLASS_STEEL_EXIT_OPENING);
8850 }
8851
8852 void CheckExitSteelEM(int x, int y)
8853 {
8854   if (local_player->gems_still_needed > 0 ||
8855       local_player->sokobanfields_still_needed > 0 ||
8856       local_player->lights_still_needed > 0)
8857   {
8858     int element = Feld[x][y];
8859     int graphic = el2img(element);
8860
8861     if (IS_ANIMATED(graphic))
8862       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
8863
8864     return;
8865   }
8866
8867   if (AllPlayersGone)   /* do not re-open exit door closed after last player */
8868     return;
8869
8870   Feld[x][y] = EL_EM_STEEL_EXIT_OPENING;
8871
8872   PlayLevelSoundNearest(x, y, SND_CLASS_EM_STEEL_EXIT_OPENING);
8873 }
8874
8875 void CheckExitSP(int x, int y)
8876 {
8877   if (local_player->gems_still_needed > 0)
8878   {
8879     int element = Feld[x][y];
8880     int graphic = el2img(element);
8881
8882     if (IS_ANIMATED(graphic))
8883       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
8884
8885     return;
8886   }
8887
8888   if (AllPlayersGone)   /* do not re-open exit door closed after last player */
8889     return;
8890
8891   Feld[x][y] = EL_SP_EXIT_OPENING;
8892
8893   PlayLevelSoundNearest(x, y, SND_CLASS_SP_EXIT_OPENING);
8894 }
8895
8896 static void CloseAllOpenTimegates()
8897 {
8898   int x, y;
8899
8900   SCAN_PLAYFIELD(x, y)
8901   {
8902     int element = Feld[x][y];
8903
8904     if (element == EL_TIMEGATE_OPEN || element == EL_TIMEGATE_OPENING)
8905     {
8906       Feld[x][y] = EL_TIMEGATE_CLOSING;
8907
8908       PlayLevelSoundAction(x, y, ACTION_CLOSING);
8909     }
8910   }
8911 }
8912
8913 void DrawTwinkleOnField(int x, int y)
8914 {
8915   if (!IN_SCR_FIELD(SCREENX(x), SCREENY(y)) || IS_MOVING(x, y))
8916     return;
8917
8918   if (Feld[x][y] == EL_BD_DIAMOND)
8919     return;
8920
8921   if (MovDelay[x][y] == 0)      /* next animation frame */
8922     MovDelay[x][y] = 11 * !GetSimpleRandom(500);
8923
8924   if (MovDelay[x][y] != 0)      /* wait some time before next frame */
8925   {
8926     MovDelay[x][y]--;
8927
8928     DrawLevelElementAnimation(x, y, Feld[x][y]);
8929
8930     if (MovDelay[x][y] != 0)
8931     {
8932       int frame = getGraphicAnimationFrame(IMG_TWINKLE_WHITE,
8933                                            10 - MovDelay[x][y]);
8934
8935       DrawGraphicThruMask(SCREENX(x), SCREENY(y), IMG_TWINKLE_WHITE, frame);
8936     }
8937   }
8938 }
8939
8940 void MauerWaechst(int x, int y)
8941 {
8942   int delay = 6;
8943
8944   if (!MovDelay[x][y])          /* next animation frame */
8945     MovDelay[x][y] = 3 * delay;
8946
8947   if (MovDelay[x][y])           /* wait some time before next frame */
8948   {
8949     MovDelay[x][y]--;
8950
8951     if (IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
8952     {
8953       int graphic = el_dir2img(Feld[x][y], GfxDir[x][y]);
8954       int frame = getGraphicAnimationFrame(graphic, 17 - MovDelay[x][y]);
8955
8956       DrawGraphic(SCREENX(x), SCREENY(y), graphic, frame);
8957     }
8958
8959     if (!MovDelay[x][y])
8960     {
8961       if (MovDir[x][y] == MV_LEFT)
8962       {
8963         if (IN_LEV_FIELD(x - 1, y) && IS_WALL(Feld[x - 1][y]))
8964           TEST_DrawLevelField(x - 1, y);
8965       }
8966       else if (MovDir[x][y] == MV_RIGHT)
8967       {
8968         if (IN_LEV_FIELD(x + 1, y) && IS_WALL(Feld[x + 1][y]))
8969           TEST_DrawLevelField(x + 1, y);
8970       }
8971       else if (MovDir[x][y] == MV_UP)
8972       {
8973         if (IN_LEV_FIELD(x, y - 1) && IS_WALL(Feld[x][y - 1]))
8974           TEST_DrawLevelField(x, y - 1);
8975       }
8976       else
8977       {
8978         if (IN_LEV_FIELD(x, y + 1) && IS_WALL(Feld[x][y + 1]))
8979           TEST_DrawLevelField(x, y + 1);
8980       }
8981
8982       Feld[x][y] = Store[x][y];
8983       Store[x][y] = 0;
8984       GfxDir[x][y] = MovDir[x][y] = MV_NONE;
8985       TEST_DrawLevelField(x, y);
8986     }
8987   }
8988 }
8989
8990 void MauerAbleger(int ax, int ay)
8991 {
8992   int element = Feld[ax][ay];
8993   int graphic = el2img(element);
8994   boolean oben_frei = FALSE, unten_frei = FALSE;
8995   boolean links_frei = FALSE, rechts_frei = FALSE;
8996   boolean oben_massiv = FALSE, unten_massiv = FALSE;
8997   boolean links_massiv = FALSE, rechts_massiv = FALSE;
8998   boolean new_wall = FALSE;
8999
9000   if (IS_ANIMATED(graphic))
9001     DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
9002
9003   if (!MovDelay[ax][ay])        /* start building new wall */
9004     MovDelay[ax][ay] = 6;
9005
9006   if (MovDelay[ax][ay])         /* wait some time before building new wall */
9007   {
9008     MovDelay[ax][ay]--;
9009     if (MovDelay[ax][ay])
9010       return;
9011   }
9012
9013   if (IN_LEV_FIELD(ax, ay-1) && IS_FREE(ax, ay-1))
9014     oben_frei = TRUE;
9015   if (IN_LEV_FIELD(ax, ay+1) && IS_FREE(ax, ay+1))
9016     unten_frei = TRUE;
9017   if (IN_LEV_FIELD(ax-1, ay) && IS_FREE(ax-1, ay))
9018     links_frei = TRUE;
9019   if (IN_LEV_FIELD(ax+1, ay) && IS_FREE(ax+1, ay))
9020     rechts_frei = TRUE;
9021
9022   if (element == EL_EXPANDABLE_WALL_VERTICAL ||
9023       element == EL_EXPANDABLE_WALL_ANY)
9024   {
9025     if (oben_frei)
9026     {
9027       Feld[ax][ay-1] = EL_EXPANDABLE_WALL_GROWING;
9028       Store[ax][ay-1] = element;
9029       GfxDir[ax][ay-1] = MovDir[ax][ay-1] = MV_UP;
9030       if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay-1)))
9031         DrawGraphic(SCREENX(ax), SCREENY(ay - 1),
9032                     IMG_EXPANDABLE_WALL_GROWING_UP, 0);
9033       new_wall = TRUE;
9034     }
9035     if (unten_frei)
9036     {
9037       Feld[ax][ay+1] = EL_EXPANDABLE_WALL_GROWING;
9038       Store[ax][ay+1] = element;
9039       GfxDir[ax][ay+1] = MovDir[ax][ay+1] = MV_DOWN;
9040       if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay+1)))
9041         DrawGraphic(SCREENX(ax), SCREENY(ay + 1),
9042                     IMG_EXPANDABLE_WALL_GROWING_DOWN, 0);
9043       new_wall = TRUE;
9044     }
9045   }
9046
9047   if (element == EL_EXPANDABLE_WALL_HORIZONTAL ||
9048       element == EL_EXPANDABLE_WALL_ANY ||
9049       element == EL_EXPANDABLE_WALL ||
9050       element == EL_BD_EXPANDABLE_WALL)
9051   {
9052     if (links_frei)
9053     {
9054       Feld[ax-1][ay] = EL_EXPANDABLE_WALL_GROWING;
9055       Store[ax-1][ay] = element;
9056       GfxDir[ax-1][ay] = MovDir[ax-1][ay] = MV_LEFT;
9057       if (IN_SCR_FIELD(SCREENX(ax-1), SCREENY(ay)))
9058         DrawGraphic(SCREENX(ax - 1), SCREENY(ay),
9059                     IMG_EXPANDABLE_WALL_GROWING_LEFT, 0);
9060       new_wall = TRUE;
9061     }
9062
9063     if (rechts_frei)
9064     {
9065       Feld[ax+1][ay] = EL_EXPANDABLE_WALL_GROWING;
9066       Store[ax+1][ay] = element;
9067       GfxDir[ax+1][ay] = MovDir[ax+1][ay] = MV_RIGHT;
9068       if (IN_SCR_FIELD(SCREENX(ax+1), SCREENY(ay)))
9069         DrawGraphic(SCREENX(ax + 1), SCREENY(ay),
9070                     IMG_EXPANDABLE_WALL_GROWING_RIGHT, 0);
9071       new_wall = TRUE;
9072     }
9073   }
9074
9075   if (element == EL_EXPANDABLE_WALL && (links_frei || rechts_frei))
9076     TEST_DrawLevelField(ax, ay);
9077
9078   if (!IN_LEV_FIELD(ax, ay-1) || IS_WALL(Feld[ax][ay-1]))
9079     oben_massiv = TRUE;
9080   if (!IN_LEV_FIELD(ax, ay+1) || IS_WALL(Feld[ax][ay+1]))
9081     unten_massiv = TRUE;
9082   if (!IN_LEV_FIELD(ax-1, ay) || IS_WALL(Feld[ax-1][ay]))
9083     links_massiv = TRUE;
9084   if (!IN_LEV_FIELD(ax+1, ay) || IS_WALL(Feld[ax+1][ay]))
9085     rechts_massiv = TRUE;
9086
9087   if (((oben_massiv && unten_massiv) ||
9088        element == EL_EXPANDABLE_WALL_HORIZONTAL ||
9089        element == EL_EXPANDABLE_WALL) &&
9090       ((links_massiv && rechts_massiv) ||
9091        element == EL_EXPANDABLE_WALL_VERTICAL))
9092     Feld[ax][ay] = EL_WALL;
9093
9094   if (new_wall)
9095     PlayLevelSoundAction(ax, ay, ACTION_GROWING);
9096 }
9097
9098 void MauerAblegerStahl(int ax, int ay)
9099 {
9100   int element = Feld[ax][ay];
9101   int graphic = el2img(element);
9102   boolean oben_frei = FALSE, unten_frei = FALSE;
9103   boolean links_frei = FALSE, rechts_frei = FALSE;
9104   boolean oben_massiv = FALSE, unten_massiv = FALSE;
9105   boolean links_massiv = FALSE, rechts_massiv = FALSE;
9106   boolean new_wall = FALSE;
9107
9108   if (IS_ANIMATED(graphic))
9109     DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
9110
9111   if (!MovDelay[ax][ay])        /* start building new wall */
9112     MovDelay[ax][ay] = 6;
9113
9114   if (MovDelay[ax][ay])         /* wait some time before building new wall */
9115   {
9116     MovDelay[ax][ay]--;
9117     if (MovDelay[ax][ay])
9118       return;
9119   }
9120
9121   if (IN_LEV_FIELD(ax, ay-1) && IS_FREE(ax, ay-1))
9122     oben_frei = TRUE;
9123   if (IN_LEV_FIELD(ax, ay+1) && IS_FREE(ax, ay+1))
9124     unten_frei = TRUE;
9125   if (IN_LEV_FIELD(ax-1, ay) && IS_FREE(ax-1, ay))
9126     links_frei = TRUE;
9127   if (IN_LEV_FIELD(ax+1, ay) && IS_FREE(ax+1, ay))
9128     rechts_frei = TRUE;
9129
9130   if (element == EL_EXPANDABLE_STEELWALL_VERTICAL ||
9131       element == EL_EXPANDABLE_STEELWALL_ANY)
9132   {
9133     if (oben_frei)
9134     {
9135       Feld[ax][ay-1] = EL_EXPANDABLE_STEELWALL_GROWING;
9136       Store[ax][ay-1] = element;
9137       GfxDir[ax][ay-1] = MovDir[ax][ay-1] = MV_UP;
9138       if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay-1)))
9139         DrawGraphic(SCREENX(ax), SCREENY(ay - 1),
9140                     IMG_EXPANDABLE_STEELWALL_GROWING_UP, 0);
9141       new_wall = TRUE;
9142     }
9143     if (unten_frei)
9144     {
9145       Feld[ax][ay+1] = EL_EXPANDABLE_STEELWALL_GROWING;
9146       Store[ax][ay+1] = element;
9147       GfxDir[ax][ay+1] = MovDir[ax][ay+1] = MV_DOWN;
9148       if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay+1)))
9149         DrawGraphic(SCREENX(ax), SCREENY(ay + 1),
9150                     IMG_EXPANDABLE_STEELWALL_GROWING_DOWN, 0);
9151       new_wall = TRUE;
9152     }
9153   }
9154
9155   if (element == EL_EXPANDABLE_STEELWALL_HORIZONTAL ||
9156       element == EL_EXPANDABLE_STEELWALL_ANY)
9157   {
9158     if (links_frei)
9159     {
9160       Feld[ax-1][ay] = EL_EXPANDABLE_STEELWALL_GROWING;
9161       Store[ax-1][ay] = element;
9162       GfxDir[ax-1][ay] = MovDir[ax-1][ay] = MV_LEFT;
9163       if (IN_SCR_FIELD(SCREENX(ax-1), SCREENY(ay)))
9164         DrawGraphic(SCREENX(ax - 1), SCREENY(ay),
9165                     IMG_EXPANDABLE_STEELWALL_GROWING_LEFT, 0);
9166       new_wall = TRUE;
9167     }
9168
9169     if (rechts_frei)
9170     {
9171       Feld[ax+1][ay] = EL_EXPANDABLE_STEELWALL_GROWING;
9172       Store[ax+1][ay] = element;
9173       GfxDir[ax+1][ay] = MovDir[ax+1][ay] = MV_RIGHT;
9174       if (IN_SCR_FIELD(SCREENX(ax+1), SCREENY(ay)))
9175         DrawGraphic(SCREENX(ax + 1), SCREENY(ay),
9176                     IMG_EXPANDABLE_STEELWALL_GROWING_RIGHT, 0);
9177       new_wall = TRUE;
9178     }
9179   }
9180
9181   if (!IN_LEV_FIELD(ax, ay-1) || IS_WALL(Feld[ax][ay-1]))
9182     oben_massiv = TRUE;
9183   if (!IN_LEV_FIELD(ax, ay+1) || IS_WALL(Feld[ax][ay+1]))
9184     unten_massiv = TRUE;
9185   if (!IN_LEV_FIELD(ax-1, ay) || IS_WALL(Feld[ax-1][ay]))
9186     links_massiv = TRUE;
9187   if (!IN_LEV_FIELD(ax+1, ay) || IS_WALL(Feld[ax+1][ay]))
9188     rechts_massiv = TRUE;
9189
9190   if (((oben_massiv && unten_massiv) ||
9191        element == EL_EXPANDABLE_STEELWALL_HORIZONTAL) &&
9192       ((links_massiv && rechts_massiv) ||
9193        element == EL_EXPANDABLE_STEELWALL_VERTICAL))
9194     Feld[ax][ay] = EL_STEELWALL;
9195
9196   if (new_wall)
9197     PlayLevelSoundAction(ax, ay, ACTION_GROWING);
9198 }
9199
9200 void CheckForDragon(int x, int y)
9201 {
9202   int i, j;
9203   boolean dragon_found = FALSE;
9204   static int xy[4][2] =
9205   {
9206     { 0, -1 },
9207     { -1, 0 },
9208     { +1, 0 },
9209     { 0, +1 }
9210   };
9211
9212   for (i = 0; i < NUM_DIRECTIONS; i++)
9213   {
9214     for (j = 0; j < 4; j++)
9215     {
9216       int xx = x + j * xy[i][0], yy = y + j * xy[i][1];
9217
9218       if (IN_LEV_FIELD(xx, yy) &&
9219           (Feld[xx][yy] == EL_FLAMES || Feld[xx][yy] == EL_DRAGON))
9220       {
9221         if (Feld[xx][yy] == EL_DRAGON)
9222           dragon_found = TRUE;
9223       }
9224       else
9225         break;
9226     }
9227   }
9228
9229   if (!dragon_found)
9230   {
9231     for (i = 0; i < NUM_DIRECTIONS; i++)
9232     {
9233       for (j = 0; j < 3; j++)
9234       {
9235         int xx = x + j * xy[i][0], yy = y + j * xy[i][1];
9236
9237         if (IN_LEV_FIELD(xx, yy) && Feld[xx][yy] == EL_FLAMES)
9238         {
9239           Feld[xx][yy] = EL_EMPTY;
9240           TEST_DrawLevelField(xx, yy);
9241         }
9242         else
9243           break;
9244       }
9245     }
9246   }
9247 }
9248
9249 static void InitBuggyBase(int x, int y)
9250 {
9251   int element = Feld[x][y];
9252   int activating_delay = FRAMES_PER_SECOND / 4;
9253
9254   ChangeDelay[x][y] =
9255     (element == EL_SP_BUGGY_BASE ?
9256      2 * FRAMES_PER_SECOND + RND(5 * FRAMES_PER_SECOND) - activating_delay :
9257      element == EL_SP_BUGGY_BASE_ACTIVATING ?
9258      activating_delay :
9259      element == EL_SP_BUGGY_BASE_ACTIVE ?
9260      1 * FRAMES_PER_SECOND + RND(1 * FRAMES_PER_SECOND) : 1);
9261 }
9262
9263 static void WarnBuggyBase(int x, int y)
9264 {
9265   int i;
9266   static int xy[4][2] =
9267   {
9268     { 0, -1 },
9269     { -1, 0 },
9270     { +1, 0 },
9271     { 0, +1 }
9272   };
9273
9274   for (i = 0; i < NUM_DIRECTIONS; i++)
9275   {
9276     int xx = x + xy[i][0];
9277     int yy = y + xy[i][1];
9278
9279     if (IN_LEV_FIELD(xx, yy) && IS_PLAYER(xx, yy))
9280     {
9281       PlayLevelSound(x, y, SND_SP_BUGGY_BASE_ACTIVE);
9282
9283       break;
9284     }
9285   }
9286 }
9287
9288 static void InitTrap(int x, int y)
9289 {
9290   ChangeDelay[x][y] = 2 * FRAMES_PER_SECOND + RND(5 * FRAMES_PER_SECOND);
9291 }
9292
9293 static void ActivateTrap(int x, int y)
9294 {
9295   PlayLevelSound(x, y, SND_TRAP_ACTIVATING);
9296 }
9297
9298 static void ChangeActiveTrap(int x, int y)
9299 {
9300   int graphic = IMG_TRAP_ACTIVE;
9301
9302   /* if new animation frame was drawn, correct crumbled sand border */
9303   if (IS_NEW_FRAME(GfxFrame[x][y], graphic))
9304     TEST_DrawLevelFieldCrumbled(x, y);
9305 }
9306
9307 static int getSpecialActionElement(int element, int number, int base_element)
9308 {
9309   return (element != EL_EMPTY ? element :
9310           number != -1 ? base_element + number - 1 :
9311           EL_EMPTY);
9312 }
9313
9314 static int getModifiedActionNumber(int value_old, int operator, int operand,
9315                                    int value_min, int value_max)
9316 {
9317   int value_new = (operator == CA_MODE_SET      ? operand :
9318                    operator == CA_MODE_ADD      ? value_old + operand :
9319                    operator == CA_MODE_SUBTRACT ? value_old - operand :
9320                    operator == CA_MODE_MULTIPLY ? value_old * operand :
9321                    operator == CA_MODE_DIVIDE   ? value_old / MAX(1, operand) :
9322                    operator == CA_MODE_MODULO   ? value_old % MAX(1, operand) :
9323                    value_old);
9324
9325   return (value_new < value_min ? value_min :
9326           value_new > value_max ? value_max :
9327           value_new);
9328 }
9329
9330 static void ExecuteCustomElementAction(int x, int y, int element, int page)
9331 {
9332   struct ElementInfo *ei = &element_info[element];
9333   struct ElementChangeInfo *change = &ei->change_page[page];
9334   int target_element = change->target_element;
9335   int action_type = change->action_type;
9336   int action_mode = change->action_mode;
9337   int action_arg = change->action_arg;
9338   int action_element = change->action_element;
9339   int i;
9340
9341   if (!change->has_action)
9342     return;
9343
9344   /* ---------- determine action paramater values -------------------------- */
9345
9346   int level_time_value =
9347     (level.time > 0 ? TimeLeft :
9348      TimePlayed);
9349
9350   int action_arg_element_raw =
9351     (action_arg == CA_ARG_PLAYER_TRIGGER  ? change->actual_trigger_player :
9352      action_arg == CA_ARG_ELEMENT_TRIGGER ? change->actual_trigger_element :
9353      action_arg == CA_ARG_ELEMENT_TARGET  ? change->target_element :
9354      action_arg == CA_ARG_ELEMENT_ACTION  ? change->action_element :
9355      action_arg == CA_ARG_INVENTORY_RM_TRIGGER ? change->actual_trigger_element:
9356      action_arg == CA_ARG_INVENTORY_RM_TARGET  ? change->target_element :
9357      action_arg == CA_ARG_INVENTORY_RM_ACTION  ? change->action_element :
9358      EL_EMPTY);
9359   int action_arg_element = GetElementFromGroupElement(action_arg_element_raw);
9360
9361   int action_arg_direction =
9362     (action_arg >= CA_ARG_DIRECTION_LEFT &&
9363      action_arg <= CA_ARG_DIRECTION_DOWN ? action_arg - CA_ARG_DIRECTION :
9364      action_arg == CA_ARG_DIRECTION_TRIGGER ?
9365      change->actual_trigger_side :
9366      action_arg == CA_ARG_DIRECTION_TRIGGER_BACK ?
9367      MV_DIR_OPPOSITE(change->actual_trigger_side) :
9368      MV_NONE);
9369
9370   int action_arg_number_min =
9371     (action_type == CA_SET_PLAYER_SPEED ? STEPSIZE_NOT_MOVING :
9372      CA_ARG_MIN);
9373
9374   int action_arg_number_max =
9375     (action_type == CA_SET_PLAYER_SPEED ? STEPSIZE_EVEN_FASTER :
9376      action_type == CA_SET_LEVEL_GEMS ? 999 :
9377      action_type == CA_SET_LEVEL_TIME ? 9999 :
9378      action_type == CA_SET_LEVEL_SCORE ? 99999 :
9379      action_type == CA_SET_CE_VALUE ? 9999 :
9380      action_type == CA_SET_CE_SCORE ? 9999 :
9381      CA_ARG_MAX);
9382
9383   int action_arg_number_reset =
9384     (action_type == CA_SET_PLAYER_SPEED ? level.initial_player_stepsize[0] :
9385      action_type == CA_SET_LEVEL_GEMS ? level.gems_needed :
9386      action_type == CA_SET_LEVEL_TIME ? level.time :
9387      action_type == CA_SET_LEVEL_SCORE ? 0 :
9388      action_type == CA_SET_CE_VALUE ? GET_NEW_CE_VALUE(element) :
9389      action_type == CA_SET_CE_SCORE ? 0 :
9390      0);
9391
9392   int action_arg_number =
9393     (action_arg <= CA_ARG_MAX ? action_arg :
9394      action_arg >= CA_ARG_SPEED_NOT_MOVING &&
9395      action_arg <= CA_ARG_SPEED_EVEN_FASTER ? (action_arg - CA_ARG_SPEED) :
9396      action_arg == CA_ARG_SPEED_RESET ? action_arg_number_reset :
9397      action_arg == CA_ARG_NUMBER_MIN ? action_arg_number_min :
9398      action_arg == CA_ARG_NUMBER_MAX ? action_arg_number_max :
9399      action_arg == CA_ARG_NUMBER_RESET ? action_arg_number_reset :
9400      action_arg == CA_ARG_NUMBER_CE_VALUE ? CustomValue[x][y] :
9401      action_arg == CA_ARG_NUMBER_CE_SCORE ? ei->collect_score :
9402      action_arg == CA_ARG_NUMBER_CE_DELAY ? GET_CE_DELAY_VALUE(change) :
9403      action_arg == CA_ARG_NUMBER_LEVEL_TIME ? level_time_value :
9404      action_arg == CA_ARG_NUMBER_LEVEL_GEMS ? local_player->gems_still_needed :
9405      action_arg == CA_ARG_NUMBER_LEVEL_SCORE ? local_player->score :
9406      action_arg == CA_ARG_ELEMENT_CV_TARGET ? GET_NEW_CE_VALUE(target_element):
9407      action_arg == CA_ARG_ELEMENT_CV_TRIGGER ? change->actual_trigger_ce_value:
9408      action_arg == CA_ARG_ELEMENT_CV_ACTION ? GET_NEW_CE_VALUE(action_element):
9409      action_arg == CA_ARG_ELEMENT_CS_TARGET ? GET_CE_SCORE(target_element) :
9410      action_arg == CA_ARG_ELEMENT_CS_TRIGGER ? change->actual_trigger_ce_score:
9411      action_arg == CA_ARG_ELEMENT_CS_ACTION ? GET_CE_SCORE(action_element) :
9412      action_arg == CA_ARG_ELEMENT_NR_TARGET  ? change->target_element :
9413      action_arg == CA_ARG_ELEMENT_NR_TRIGGER ? change->actual_trigger_element :
9414      action_arg == CA_ARG_ELEMENT_NR_ACTION  ? change->action_element :
9415      -1);
9416
9417   int action_arg_number_old =
9418     (action_type == CA_SET_LEVEL_GEMS ? local_player->gems_still_needed :
9419      action_type == CA_SET_LEVEL_TIME ? TimeLeft :
9420      action_type == CA_SET_LEVEL_SCORE ? local_player->score :
9421      action_type == CA_SET_CE_VALUE ? CustomValue[x][y] :
9422      action_type == CA_SET_CE_SCORE ? ei->collect_score :
9423      0);
9424
9425   int action_arg_number_new =
9426     getModifiedActionNumber(action_arg_number_old,
9427                             action_mode, action_arg_number,
9428                             action_arg_number_min, action_arg_number_max);
9429
9430   int trigger_player_bits =
9431     (change->actual_trigger_player_bits != CH_PLAYER_NONE ?
9432      change->actual_trigger_player_bits : change->trigger_player);
9433
9434   int action_arg_player_bits =
9435     (action_arg >= CA_ARG_PLAYER_1 &&
9436      action_arg <= CA_ARG_PLAYER_4 ? action_arg - CA_ARG_PLAYER :
9437      action_arg == CA_ARG_PLAYER_TRIGGER ? trigger_player_bits :
9438      action_arg == CA_ARG_PLAYER_ACTION ? 1 << GET_PLAYER_NR(action_element) :
9439      PLAYER_BITS_ANY);
9440
9441   /* ---------- execute action  -------------------------------------------- */
9442
9443   switch (action_type)
9444   {
9445     case CA_NO_ACTION:
9446     {
9447       return;
9448     }
9449
9450     /* ---------- level actions  ------------------------------------------- */
9451
9452     case CA_RESTART_LEVEL:
9453     {
9454       game.restart_level = TRUE;
9455
9456       break;
9457     }
9458
9459     case CA_SHOW_ENVELOPE:
9460     {
9461       int element = getSpecialActionElement(action_arg_element,
9462                                             action_arg_number, EL_ENVELOPE_1);
9463
9464       if (IS_ENVELOPE(element))
9465         local_player->show_envelope = element;
9466
9467       break;
9468     }
9469
9470     case CA_SET_LEVEL_TIME:
9471     {
9472       if (level.time > 0)       /* only modify limited time value */
9473       {
9474         TimeLeft = action_arg_number_new;
9475
9476         game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
9477
9478         DisplayGameControlValues();
9479
9480         if (!TimeLeft && setup.time_limit)
9481           for (i = 0; i < MAX_PLAYERS; i++)
9482             KillPlayer(&stored_player[i]);
9483       }
9484
9485       break;
9486     }
9487
9488     case CA_SET_LEVEL_SCORE:
9489     {
9490       local_player->score = action_arg_number_new;
9491
9492       game_panel_controls[GAME_PANEL_SCORE].value = local_player->score;
9493
9494       DisplayGameControlValues();
9495
9496       break;
9497     }
9498
9499     case CA_SET_LEVEL_GEMS:
9500     {
9501       local_player->gems_still_needed = action_arg_number_new;
9502
9503       game.snapshot.collected_item = TRUE;
9504
9505       game_panel_controls[GAME_PANEL_GEMS].value =
9506         local_player->gems_still_needed;
9507
9508       DisplayGameControlValues();
9509
9510       break;
9511     }
9512
9513     case CA_SET_LEVEL_WIND:
9514     {
9515       game.wind_direction = action_arg_direction;
9516
9517       break;
9518     }
9519
9520     case CA_SET_LEVEL_RANDOM_SEED:
9521     {
9522       /* ensure that setting a new random seed while playing is predictable */
9523       InitRND(action_arg_number_new ? action_arg_number_new : RND(1000000) + 1);
9524
9525       break;
9526     }
9527
9528     /* ---------- player actions  ------------------------------------------ */
9529
9530     case CA_MOVE_PLAYER:
9531     {
9532       /* automatically move to the next field in specified direction */
9533       for (i = 0; i < MAX_PLAYERS; i++)
9534         if (trigger_player_bits & (1 << i))
9535           stored_player[i].programmed_action = action_arg_direction;
9536
9537       break;
9538     }
9539
9540     case CA_EXIT_PLAYER:
9541     {
9542       for (i = 0; i < MAX_PLAYERS; i++)
9543         if (action_arg_player_bits & (1 << i))
9544           PlayerWins(&stored_player[i]);
9545
9546       break;
9547     }
9548
9549     case CA_KILL_PLAYER:
9550     {
9551       for (i = 0; i < MAX_PLAYERS; i++)
9552         if (action_arg_player_bits & (1 << i))
9553           KillPlayer(&stored_player[i]);
9554
9555       break;
9556     }
9557
9558     case CA_SET_PLAYER_KEYS:
9559     {
9560       int key_state = (action_mode == CA_MODE_ADD ? TRUE : FALSE);
9561       int element = getSpecialActionElement(action_arg_element,
9562                                             action_arg_number, EL_KEY_1);
9563
9564       if (IS_KEY(element))
9565       {
9566         for (i = 0; i < MAX_PLAYERS; i++)
9567         {
9568           if (trigger_player_bits & (1 << i))
9569           {
9570             stored_player[i].key[KEY_NR(element)] = key_state;
9571
9572             DrawGameDoorValues();
9573           }
9574         }
9575       }
9576
9577       break;
9578     }
9579
9580     case CA_SET_PLAYER_SPEED:
9581     {
9582       for (i = 0; i < MAX_PLAYERS; i++)
9583       {
9584         if (trigger_player_bits & (1 << i))
9585         {
9586           int move_stepsize = TILEX / stored_player[i].move_delay_value;
9587
9588           if (action_arg == CA_ARG_SPEED_FASTER &&
9589               stored_player[i].cannot_move)
9590           {
9591             action_arg_number = STEPSIZE_VERY_SLOW;
9592           }
9593           else if (action_arg == CA_ARG_SPEED_SLOWER ||
9594                    action_arg == CA_ARG_SPEED_FASTER)
9595           {
9596             action_arg_number = 2;
9597             action_mode = (action_arg == CA_ARG_SPEED_SLOWER ? CA_MODE_DIVIDE :
9598                            CA_MODE_MULTIPLY);
9599           }
9600           else if (action_arg == CA_ARG_NUMBER_RESET)
9601           {
9602             action_arg_number = level.initial_player_stepsize[i];
9603           }
9604
9605           move_stepsize =
9606             getModifiedActionNumber(move_stepsize,
9607                                     action_mode,
9608                                     action_arg_number,
9609                                     action_arg_number_min,
9610                                     action_arg_number_max);
9611
9612           SetPlayerMoveSpeed(&stored_player[i], move_stepsize, FALSE);
9613         }
9614       }
9615
9616       break;
9617     }
9618
9619     case CA_SET_PLAYER_SHIELD:
9620     {
9621       for (i = 0; i < MAX_PLAYERS; i++)
9622       {
9623         if (trigger_player_bits & (1 << i))
9624         {
9625           if (action_arg == CA_ARG_SHIELD_OFF)
9626           {
9627             stored_player[i].shield_normal_time_left = 0;
9628             stored_player[i].shield_deadly_time_left = 0;
9629           }
9630           else if (action_arg == CA_ARG_SHIELD_NORMAL)
9631           {
9632             stored_player[i].shield_normal_time_left = 999999;
9633           }
9634           else if (action_arg == CA_ARG_SHIELD_DEADLY)
9635           {
9636             stored_player[i].shield_normal_time_left = 999999;
9637             stored_player[i].shield_deadly_time_left = 999999;
9638           }
9639         }
9640       }
9641
9642       break;
9643     }
9644
9645     case CA_SET_PLAYER_GRAVITY:
9646     {
9647       for (i = 0; i < MAX_PLAYERS; i++)
9648       {
9649         if (trigger_player_bits & (1 << i))
9650         {
9651           stored_player[i].gravity =
9652             (action_arg == CA_ARG_GRAVITY_OFF    ? FALSE                     :
9653              action_arg == CA_ARG_GRAVITY_ON     ? TRUE                      :
9654              action_arg == CA_ARG_GRAVITY_TOGGLE ? !stored_player[i].gravity :
9655              stored_player[i].gravity);
9656         }
9657       }
9658
9659       break;
9660     }
9661
9662     case CA_SET_PLAYER_ARTWORK:
9663     {
9664       for (i = 0; i < MAX_PLAYERS; i++)
9665       {
9666         if (trigger_player_bits & (1 << i))
9667         {
9668           int artwork_element = action_arg_element;
9669
9670           if (action_arg == CA_ARG_ELEMENT_RESET)
9671             artwork_element =
9672               (level.use_artwork_element[i] ? level.artwork_element[i] :
9673                stored_player[i].element_nr);
9674
9675           if (stored_player[i].artwork_element != artwork_element)
9676             stored_player[i].Frame = 0;
9677
9678           stored_player[i].artwork_element = artwork_element;
9679
9680           SetPlayerWaiting(&stored_player[i], FALSE);
9681
9682           /* set number of special actions for bored and sleeping animation */
9683           stored_player[i].num_special_action_bored =
9684             get_num_special_action(artwork_element,
9685                                    ACTION_BORING_1, ACTION_BORING_LAST);
9686           stored_player[i].num_special_action_sleeping =
9687             get_num_special_action(artwork_element,
9688                                    ACTION_SLEEPING_1, ACTION_SLEEPING_LAST);
9689         }
9690       }
9691
9692       break;
9693     }
9694
9695     case CA_SET_PLAYER_INVENTORY:
9696     {
9697       for (i = 0; i < MAX_PLAYERS; i++)
9698       {
9699         struct PlayerInfo *player = &stored_player[i];
9700         int j, k;
9701
9702         if (trigger_player_bits & (1 << i))
9703         {
9704           int inventory_element = action_arg_element;
9705
9706           if (action_arg == CA_ARG_ELEMENT_TARGET ||
9707               action_arg == CA_ARG_ELEMENT_TRIGGER ||
9708               action_arg == CA_ARG_ELEMENT_ACTION)
9709           {
9710             int element = inventory_element;
9711             int collect_count = element_info[element].collect_count_initial;
9712
9713             if (!IS_CUSTOM_ELEMENT(element))
9714               collect_count = 1;
9715
9716             if (collect_count == 0)
9717               player->inventory_infinite_element = element;
9718             else
9719               for (k = 0; k < collect_count; k++)
9720                 if (player->inventory_size < MAX_INVENTORY_SIZE)
9721                   player->inventory_element[player->inventory_size++] =
9722                     element;
9723           }
9724           else if (action_arg == CA_ARG_INVENTORY_RM_TARGET ||
9725                    action_arg == CA_ARG_INVENTORY_RM_TRIGGER ||
9726                    action_arg == CA_ARG_INVENTORY_RM_ACTION)
9727           {
9728             if (player->inventory_infinite_element != EL_UNDEFINED &&
9729                 IS_EQUAL_OR_IN_GROUP(player->inventory_infinite_element,
9730                                      action_arg_element_raw))
9731               player->inventory_infinite_element = EL_UNDEFINED;
9732
9733             for (k = 0, j = 0; j < player->inventory_size; j++)
9734             {
9735               if (!IS_EQUAL_OR_IN_GROUP(player->inventory_element[j],
9736                                         action_arg_element_raw))
9737                 player->inventory_element[k++] = player->inventory_element[j];
9738             }
9739
9740             player->inventory_size = k;
9741           }
9742           else if (action_arg == CA_ARG_INVENTORY_RM_FIRST)
9743           {
9744             if (player->inventory_size > 0)
9745             {
9746               for (j = 0; j < player->inventory_size - 1; j++)
9747                 player->inventory_element[j] = player->inventory_element[j + 1];
9748
9749               player->inventory_size--;
9750             }
9751           }
9752           else if (action_arg == CA_ARG_INVENTORY_RM_LAST)
9753           {
9754             if (player->inventory_size > 0)
9755               player->inventory_size--;
9756           }
9757           else if (action_arg == CA_ARG_INVENTORY_RM_ALL)
9758           {
9759             player->inventory_infinite_element = EL_UNDEFINED;
9760             player->inventory_size = 0;
9761           }
9762           else if (action_arg == CA_ARG_INVENTORY_RESET)
9763           {
9764             player->inventory_infinite_element = EL_UNDEFINED;
9765             player->inventory_size = 0;
9766
9767             if (level.use_initial_inventory[i])
9768             {
9769               for (j = 0; j < level.initial_inventory_size[i]; j++)
9770               {
9771                 int element = level.initial_inventory_content[i][j];
9772                 int collect_count = element_info[element].collect_count_initial;
9773
9774                 if (!IS_CUSTOM_ELEMENT(element))
9775                   collect_count = 1;
9776
9777                 if (collect_count == 0)
9778                   player->inventory_infinite_element = element;
9779                 else
9780                   for (k = 0; k < collect_count; k++)
9781                     if (player->inventory_size < MAX_INVENTORY_SIZE)
9782                       player->inventory_element[player->inventory_size++] =
9783                         element;
9784               }
9785             }
9786           }
9787         }
9788       }
9789
9790       break;
9791     }
9792
9793     /* ---------- CE actions  ---------------------------------------------- */
9794
9795     case CA_SET_CE_VALUE:
9796     {
9797       int last_ce_value = CustomValue[x][y];
9798
9799       CustomValue[x][y] = action_arg_number_new;
9800
9801       if (CustomValue[x][y] != last_ce_value)
9802       {
9803         CheckElementChange(x, y, element, EL_UNDEFINED, CE_VALUE_CHANGES);
9804         CheckTriggeredElementChange(x, y, element, CE_VALUE_CHANGES_OF_X);
9805
9806         if (CustomValue[x][y] == 0)
9807         {
9808           CheckElementChange(x, y, element, EL_UNDEFINED, CE_VALUE_GETS_ZERO);
9809           CheckTriggeredElementChange(x, y, element, CE_VALUE_GETS_ZERO_OF_X);
9810         }
9811       }
9812
9813       break;
9814     }
9815
9816     case CA_SET_CE_SCORE:
9817     {
9818       int last_ce_score = ei->collect_score;
9819
9820       ei->collect_score = action_arg_number_new;
9821
9822       if (ei->collect_score != last_ce_score)
9823       {
9824         CheckElementChange(x, y, element, EL_UNDEFINED, CE_SCORE_CHANGES);
9825         CheckTriggeredElementChange(x, y, element, CE_SCORE_CHANGES_OF_X);
9826
9827         if (ei->collect_score == 0)
9828         {
9829           int xx, yy;
9830
9831           CheckElementChange(x, y, element, EL_UNDEFINED, CE_SCORE_GETS_ZERO);
9832           CheckTriggeredElementChange(x, y, element, CE_SCORE_GETS_ZERO_OF_X);
9833
9834           /*
9835             This is a very special case that seems to be a mixture between
9836             CheckElementChange() and CheckTriggeredElementChange(): while
9837             the first one only affects single elements that are triggered
9838             directly, the second one affects multiple elements in the playfield
9839             that are triggered indirectly by another element. This is a third
9840             case: Changing the CE score always affects multiple identical CEs,
9841             so every affected CE must be checked, not only the single CE for
9842             which the CE score was changed in the first place (as every instance
9843             of that CE shares the same CE score, and therefore also can change)!
9844           */
9845           SCAN_PLAYFIELD(xx, yy)
9846           {
9847             if (Feld[xx][yy] == element)
9848               CheckElementChange(xx, yy, element, EL_UNDEFINED,
9849                                  CE_SCORE_GETS_ZERO);
9850           }
9851         }
9852       }
9853
9854       break;
9855     }
9856
9857     case CA_SET_CE_ARTWORK:
9858     {
9859       int artwork_element = action_arg_element;
9860       boolean reset_frame = FALSE;
9861       int xx, yy;
9862
9863       if (action_arg == CA_ARG_ELEMENT_RESET)
9864         artwork_element = (ei->use_gfx_element ? ei->gfx_element_initial :
9865                            element);
9866
9867       if (ei->gfx_element != artwork_element)
9868         reset_frame = TRUE;
9869
9870       ei->gfx_element = artwork_element;
9871
9872       SCAN_PLAYFIELD(xx, yy)
9873       {
9874         if (Feld[xx][yy] == element)
9875         {
9876           if (reset_frame)
9877           {
9878             ResetGfxAnimation(xx, yy);
9879             ResetRandomAnimationValue(xx, yy);
9880           }
9881
9882           TEST_DrawLevelField(xx, yy);
9883         }
9884       }
9885
9886       break;
9887     }
9888
9889     /* ---------- engine actions  ------------------------------------------ */
9890
9891     case CA_SET_ENGINE_SCAN_MODE:
9892     {
9893       InitPlayfieldScanMode(action_arg);
9894
9895       break;
9896     }
9897
9898     default:
9899       break;
9900   }
9901 }
9902
9903 static void CreateFieldExt(int x, int y, int element, boolean is_change)
9904 {
9905   int old_element = Feld[x][y];
9906   int new_element = GetElementFromGroupElement(element);
9907   int previous_move_direction = MovDir[x][y];
9908   int last_ce_value = CustomValue[x][y];
9909   boolean player_explosion_protected = PLAYER_EXPLOSION_PROTECTED(x, y);
9910   boolean new_element_is_player = ELEM_IS_PLAYER(new_element);
9911   boolean add_player_onto_element = (new_element_is_player &&
9912                                      new_element != EL_SOKOBAN_FIELD_PLAYER &&
9913                                      IS_WALKABLE(old_element));
9914
9915   if (!add_player_onto_element)
9916   {
9917     if (IS_MOVING(x, y) || IS_BLOCKED(x, y))
9918       RemoveMovingField(x, y);
9919     else
9920       RemoveField(x, y);
9921
9922     Feld[x][y] = new_element;
9923
9924     if (element_info[new_element].move_direction_initial == MV_START_PREVIOUS)
9925       MovDir[x][y] = previous_move_direction;
9926
9927     if (element_info[new_element].use_last_ce_value)
9928       CustomValue[x][y] = last_ce_value;
9929
9930     InitField_WithBug1(x, y, FALSE);
9931
9932     new_element = Feld[x][y];   /* element may have changed */
9933
9934     ResetGfxAnimation(x, y);
9935     ResetRandomAnimationValue(x, y);
9936
9937     TEST_DrawLevelField(x, y);
9938
9939     if (GFX_CRUMBLED(new_element))
9940       TEST_DrawLevelFieldCrumbledNeighbours(x, y);
9941   }
9942
9943   /* check if element under the player changes from accessible to unaccessible
9944      (needed for special case of dropping element which then changes) */
9945   /* (must be checked after creating new element for walkable group elements) */
9946   if (IS_PLAYER(x, y) && !player_explosion_protected &&
9947       IS_ACCESSIBLE(old_element) && !IS_ACCESSIBLE(new_element))
9948   {
9949     Bang(x, y);
9950
9951     return;
9952   }
9953
9954   /* "ChangeCount" not set yet to allow "entered by player" change one time */
9955   if (new_element_is_player)
9956     RelocatePlayer(x, y, new_element);
9957
9958   if (is_change)
9959     ChangeCount[x][y]++;        /* count number of changes in the same frame */
9960
9961   TestIfBadThingTouchesPlayer(x, y);
9962   TestIfPlayerTouchesCustomElement(x, y);
9963   TestIfElementTouchesCustomElement(x, y);
9964 }
9965
9966 static void CreateField(int x, int y, int element)
9967 {
9968   CreateFieldExt(x, y, element, FALSE);
9969 }
9970
9971 static void CreateElementFromChange(int x, int y, int element)
9972 {
9973   element = GET_VALID_RUNTIME_ELEMENT(element);
9974
9975   if (game.engine_version >= VERSION_IDENT(3,2,0,7))
9976   {
9977     int old_element = Feld[x][y];
9978
9979     /* prevent changed element from moving in same engine frame
9980        unless both old and new element can either fall or move */
9981     if ((!CAN_FALL(old_element) || !CAN_FALL(element)) &&
9982         (!CAN_MOVE(old_element) || !CAN_MOVE(element)))
9983       Stop[x][y] = TRUE;
9984   }
9985
9986   CreateFieldExt(x, y, element, TRUE);
9987 }
9988
9989 static boolean ChangeElement(int x, int y, int element, int page)
9990 {
9991   struct ElementInfo *ei = &element_info[element];
9992   struct ElementChangeInfo *change = &ei->change_page[page];
9993   int ce_value = CustomValue[x][y];
9994   int ce_score = ei->collect_score;
9995   int target_element;
9996   int old_element = Feld[x][y];
9997
9998   /* always use default change event to prevent running into a loop */
9999   if (ChangeEvent[x][y] == -1)
10000     ChangeEvent[x][y] = CE_DELAY;
10001
10002   if (ChangeEvent[x][y] == CE_DELAY)
10003   {
10004     /* reset actual trigger element, trigger player and action element */
10005     change->actual_trigger_element = EL_EMPTY;
10006     change->actual_trigger_player = EL_EMPTY;
10007     change->actual_trigger_player_bits = CH_PLAYER_NONE;
10008     change->actual_trigger_side = CH_SIDE_NONE;
10009     change->actual_trigger_ce_value = 0;
10010     change->actual_trigger_ce_score = 0;
10011   }
10012
10013   /* do not change elements more than a specified maximum number of changes */
10014   if (ChangeCount[x][y] >= game.max_num_changes_per_frame)
10015     return FALSE;
10016
10017   ChangeCount[x][y]++;          /* count number of changes in the same frame */
10018
10019   if (change->explode)
10020   {
10021     Bang(x, y);
10022
10023     return TRUE;
10024   }
10025
10026   if (change->use_target_content)
10027   {
10028     boolean complete_replace = TRUE;
10029     boolean can_replace[3][3];
10030     int xx, yy;
10031
10032     for (yy = 0; yy < 3; yy++) for (xx = 0; xx < 3 ; xx++)
10033     {
10034       boolean is_empty;
10035       boolean is_walkable;
10036       boolean is_diggable;
10037       boolean is_collectible;
10038       boolean is_removable;
10039       boolean is_destructible;
10040       int ex = x + xx - 1;
10041       int ey = y + yy - 1;
10042       int content_element = change->target_content.e[xx][yy];
10043       int e;
10044
10045       can_replace[xx][yy] = TRUE;
10046
10047       if (ex == x && ey == y)   /* do not check changing element itself */
10048         continue;
10049
10050       if (content_element == EL_EMPTY_SPACE)
10051       {
10052         can_replace[xx][yy] = FALSE;    /* do not replace border with space */
10053
10054         continue;
10055       }
10056
10057       if (!IN_LEV_FIELD(ex, ey))
10058       {
10059         can_replace[xx][yy] = FALSE;
10060         complete_replace = FALSE;
10061
10062         continue;
10063       }
10064
10065       e = Feld[ex][ey];
10066
10067       if (IS_MOVING(ex, ey) || IS_BLOCKED(ex, ey))
10068         e = MovingOrBlocked2Element(ex, ey);
10069
10070       is_empty = (IS_FREE(ex, ey) ||
10071                   (IS_FREE_OR_PLAYER(ex, ey) && IS_WALKABLE(content_element)));
10072
10073       is_walkable     = (is_empty || IS_WALKABLE(e));
10074       is_diggable     = (is_empty || IS_DIGGABLE(e));
10075       is_collectible  = (is_empty || IS_COLLECTIBLE(e));
10076       is_destructible = (is_empty || !IS_INDESTRUCTIBLE(e));
10077       is_removable    = (is_diggable || is_collectible);
10078
10079       can_replace[xx][yy] =
10080         (((change->replace_when == CP_WHEN_EMPTY        && is_empty) ||
10081           (change->replace_when == CP_WHEN_WALKABLE     && is_walkable) ||
10082           (change->replace_when == CP_WHEN_DIGGABLE     && is_diggable) ||
10083           (change->replace_when == CP_WHEN_COLLECTIBLE  && is_collectible) ||
10084           (change->replace_when == CP_WHEN_REMOVABLE    && is_removable) ||
10085           (change->replace_when == CP_WHEN_DESTRUCTIBLE && is_destructible)) &&
10086          !(IS_PLAYER(ex, ey) && ELEM_IS_PLAYER(content_element)));
10087
10088       if (!can_replace[xx][yy])
10089         complete_replace = FALSE;
10090     }
10091
10092     if (!change->only_if_complete || complete_replace)
10093     {
10094       boolean something_has_changed = FALSE;
10095
10096       if (change->only_if_complete && change->use_random_replace &&
10097           RND(100) < change->random_percentage)
10098         return FALSE;
10099
10100       for (yy = 0; yy < 3; yy++) for (xx = 0; xx < 3 ; xx++)
10101       {
10102         int ex = x + xx - 1;
10103         int ey = y + yy - 1;
10104         int content_element;
10105
10106         if (can_replace[xx][yy] && (!change->use_random_replace ||
10107                                     RND(100) < change->random_percentage))
10108         {
10109           if (IS_MOVING(ex, ey) || IS_BLOCKED(ex, ey))
10110             RemoveMovingField(ex, ey);
10111
10112           ChangeEvent[ex][ey] = ChangeEvent[x][y];
10113
10114           content_element = change->target_content.e[xx][yy];
10115           target_element = GET_TARGET_ELEMENT(element, content_element, change,
10116                                               ce_value, ce_score);
10117
10118           CreateElementFromChange(ex, ey, target_element);
10119
10120           something_has_changed = TRUE;
10121
10122           /* for symmetry reasons, freeze newly created border elements */
10123           if (ex != x || ey != y)
10124             Stop[ex][ey] = TRUE;        /* no more moving in this frame */
10125         }
10126       }
10127
10128       if (something_has_changed)
10129       {
10130         PlayLevelSoundElementAction(x, y, element, ACTION_CHANGING);
10131         PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + page);
10132       }
10133     }
10134   }
10135   else
10136   {
10137     target_element = GET_TARGET_ELEMENT(element, change->target_element, change,
10138                                         ce_value, ce_score);
10139
10140     if (element == EL_DIAGONAL_GROWING ||
10141         element == EL_DIAGONAL_SHRINKING)
10142     {
10143       target_element = Store[x][y];
10144
10145       Store[x][y] = EL_EMPTY;
10146     }
10147
10148     CreateElementFromChange(x, y, target_element);
10149
10150     PlayLevelSoundElementAction(x, y, element, ACTION_CHANGING);
10151     PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + page);
10152   }
10153
10154   /* this uses direct change before indirect change */
10155   CheckTriggeredElementChangeByPage(x, y, old_element, CE_CHANGE_OF_X, page);
10156
10157   return TRUE;
10158 }
10159
10160 static void HandleElementChange(int x, int y, int page)
10161 {
10162   int element = MovingOrBlocked2Element(x, y);
10163   struct ElementInfo *ei = &element_info[element];
10164   struct ElementChangeInfo *change = &ei->change_page[page];
10165   boolean handle_action_before_change = FALSE;
10166
10167 #ifdef DEBUG
10168   if (!CAN_CHANGE_OR_HAS_ACTION(element) &&
10169       !CAN_CHANGE_OR_HAS_ACTION(Back[x][y]))
10170   {
10171     printf("\n\n");
10172     printf("HandleElementChange(): %d,%d: element = %d ('%s')\n",
10173            x, y, element, element_info[element].token_name);
10174     printf("HandleElementChange(): This should never happen!\n");
10175     printf("\n\n");
10176   }
10177 #endif
10178
10179   /* this can happen with classic bombs on walkable, changing elements */
10180   if (!CAN_CHANGE_OR_HAS_ACTION(element))
10181   {
10182     return;
10183   }
10184
10185   if (ChangeDelay[x][y] == 0)           /* initialize element change */
10186   {
10187     ChangeDelay[x][y] = GET_CHANGE_DELAY(change) + 1;
10188
10189     if (change->can_change)
10190     {
10191       /* !!! not clear why graphic animation should be reset at all here !!! */
10192       /* !!! UPDATE: but is needed for correct Snake Bite tail animation !!! */
10193       /* !!! SOLUTION: do not reset if graphics engine set to 4 or above !!! */
10194
10195       /*
10196         GRAPHICAL BUG ADDRESSED BY CHECKING GRAPHICS ENGINE VERSION:
10197
10198         When using an animation frame delay of 1 (this only happens with
10199         "sp_zonk.moving.left/right" in the classic graphics), the default
10200         (non-moving) animation shows wrong animation frames (while the
10201         moving animation, like "sp_zonk.moving.left/right", is correct,
10202         so this graphical bug never shows up with the classic graphics).
10203         For an animation with 4 frames, this causes wrong frames 0,0,1,2
10204         be drawn instead of the correct frames 0,1,2,3. This is caused by
10205         "GfxFrame[][]" being reset *twice* (in two successive frames) after
10206         an element change: First when the change delay ("ChangeDelay[][]")
10207         counter has reached zero after decrementing, then a second time in
10208         the next frame (after "GfxFrame[][]" was already incremented) when
10209         "ChangeDelay[][]" is reset to the initial delay value again.
10210
10211         This causes frame 0 to be drawn twice, while the last frame won't
10212         be drawn anymore, resulting in the wrong frame sequence 0,0,1,2.
10213
10214         As some animations may already be cleverly designed around this bug
10215         (at least the "Snake Bite" snake tail animation does this), it cannot
10216         simply be fixed here without breaking such existing animations.
10217         Unfortunately, it cannot easily be detected if a graphics set was
10218         designed "before" or "after" the bug was fixed. As a workaround,
10219         a new graphics set option "game.graphics_engine_version" was added
10220         to be able to specify the game's major release version for which the
10221         graphics set was designed, which can then be used to decide if the
10222         bugfix should be used (version 4 and above) or not (version 3 or
10223         below, or if no version was specified at all, as with old sets).
10224
10225         (The wrong/fixed animation frames can be tested with the test level set
10226         "test_gfxframe" and level "000", which contains a specially prepared
10227         custom element at level position (x/y) == (11/9) which uses the zonk
10228         animation mentioned above. Using "game.graphics_engine_version: 4"
10229         fixes the wrong animation frames, showing the correct frames 0,1,2,3.
10230         This can also be seen from the debug output for this test element.)
10231       */
10232
10233       /* when a custom element is about to change (for example by change delay),
10234          do not reset graphic animation when the custom element is moving */
10235       if (game.graphics_engine_version < 4 &&
10236           !IS_MOVING(x, y))
10237       {
10238         ResetGfxAnimation(x, y);
10239         ResetRandomAnimationValue(x, y);
10240       }
10241
10242       if (change->pre_change_function)
10243         change->pre_change_function(x, y);
10244     }
10245   }
10246
10247   ChangeDelay[x][y]--;
10248
10249   if (ChangeDelay[x][y] != 0)           /* continue element change */
10250   {
10251     if (change->can_change)
10252     {
10253       int graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
10254
10255       if (IS_ANIMATED(graphic))
10256         DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
10257
10258       if (change->change_function)
10259         change->change_function(x, y);
10260     }
10261   }
10262   else                                  /* finish element change */
10263   {
10264     if (ChangePage[x][y] != -1)         /* remember page from delayed change */
10265     {
10266       page = ChangePage[x][y];
10267       ChangePage[x][y] = -1;
10268
10269       change = &ei->change_page[page];
10270     }
10271
10272     if (IS_MOVING(x, y))                /* never change a running system ;-) */
10273     {
10274       ChangeDelay[x][y] = 1;            /* try change after next move step */
10275       ChangePage[x][y] = page;          /* remember page to use for change */
10276
10277       return;
10278     }
10279
10280     /* special case: set new level random seed before changing element */
10281     if (change->has_action && change->action_type == CA_SET_LEVEL_RANDOM_SEED)
10282       handle_action_before_change = TRUE;
10283
10284     if (change->has_action && handle_action_before_change)
10285       ExecuteCustomElementAction(x, y, element, page);
10286
10287     if (change->can_change)
10288     {
10289       if (ChangeElement(x, y, element, page))
10290       {
10291         if (change->post_change_function)
10292           change->post_change_function(x, y);
10293       }
10294     }
10295
10296     if (change->has_action && !handle_action_before_change)
10297       ExecuteCustomElementAction(x, y, element, page);
10298   }
10299 }
10300
10301 static boolean CheckTriggeredElementChangeExt(int trigger_x, int trigger_y,
10302                                               int trigger_element,
10303                                               int trigger_event,
10304                                               int trigger_player,
10305                                               int trigger_side,
10306                                               int trigger_page)
10307 {
10308   boolean change_done_any = FALSE;
10309   int trigger_page_bits = (trigger_page < 0 ? CH_PAGE_ANY : 1 << trigger_page);
10310   int i;
10311
10312   if (!(trigger_events[trigger_element][trigger_event]))
10313     return FALSE;
10314
10315   RECURSION_LOOP_DETECTION_START(trigger_element, FALSE);
10316
10317   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
10318   {
10319     int element = EL_CUSTOM_START + i;
10320     boolean change_done = FALSE;
10321     int p;
10322
10323     if (!CAN_CHANGE_OR_HAS_ACTION(element) ||
10324         !HAS_ANY_CHANGE_EVENT(element, trigger_event))
10325       continue;
10326
10327     for (p = 0; p < element_info[element].num_change_pages; p++)
10328     {
10329       struct ElementChangeInfo *change = &element_info[element].change_page[p];
10330
10331       if (change->can_change_or_has_action &&
10332           change->has_event[trigger_event] &&
10333           change->trigger_side & trigger_side &&
10334           change->trigger_player & trigger_player &&
10335           change->trigger_page & trigger_page_bits &&
10336           IS_EQUAL_OR_IN_GROUP(trigger_element, change->trigger_element))
10337       {
10338         change->actual_trigger_element = trigger_element;
10339         change->actual_trigger_player = GET_PLAYER_FROM_BITS(trigger_player);
10340         change->actual_trigger_player_bits = trigger_player;
10341         change->actual_trigger_side = trigger_side;
10342         change->actual_trigger_ce_value = CustomValue[trigger_x][trigger_y];
10343         change->actual_trigger_ce_score = GET_CE_SCORE(trigger_element);
10344
10345         if ((change->can_change && !change_done) || change->has_action)
10346         {
10347           int x, y;
10348
10349           SCAN_PLAYFIELD(x, y)
10350           {
10351             if (Feld[x][y] == element)
10352             {
10353               if (change->can_change && !change_done)
10354               {
10355                 /* if element already changed in this frame, not only prevent
10356                    another element change (checked in ChangeElement()), but
10357                    also prevent additional element actions for this element */
10358
10359                 if (ChangeCount[x][y] >= game.max_num_changes_per_frame &&
10360                     !level.use_action_after_change_bug)
10361                   continue;
10362
10363                 ChangeDelay[x][y] = 1;
10364                 ChangeEvent[x][y] = trigger_event;
10365
10366                 HandleElementChange(x, y, p);
10367               }
10368               else if (change->has_action)
10369               {
10370                 /* if element already changed in this frame, not only prevent
10371                    another element change (checked in ChangeElement()), but
10372                    also prevent additional element actions for this element */
10373
10374                 if (ChangeCount[x][y] >= game.max_num_changes_per_frame &&
10375                     !level.use_action_after_change_bug)
10376                   continue;
10377
10378                 ExecuteCustomElementAction(x, y, element, p);
10379                 PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + p);
10380               }
10381             }
10382           }
10383
10384           if (change->can_change)
10385           {
10386             change_done = TRUE;
10387             change_done_any = TRUE;
10388           }
10389         }
10390       }
10391     }
10392   }
10393
10394   RECURSION_LOOP_DETECTION_END();
10395
10396   return change_done_any;
10397 }
10398
10399 static boolean CheckElementChangeExt(int x, int y,
10400                                      int element,
10401                                      int trigger_element,
10402                                      int trigger_event,
10403                                      int trigger_player,
10404                                      int trigger_side)
10405 {
10406   boolean change_done = FALSE;
10407   int p;
10408
10409   if (!CAN_CHANGE_OR_HAS_ACTION(element) ||
10410       !HAS_ANY_CHANGE_EVENT(element, trigger_event))
10411     return FALSE;
10412
10413   if (Feld[x][y] == EL_BLOCKED)
10414   {
10415     Blocked2Moving(x, y, &x, &y);
10416     element = Feld[x][y];
10417   }
10418
10419   /* check if element has already changed or is about to change after moving */
10420   if ((game.engine_version < VERSION_IDENT(3,2,0,7) &&
10421        Feld[x][y] != element) ||
10422
10423       (game.engine_version >= VERSION_IDENT(3,2,0,7) &&
10424        (ChangeCount[x][y] >= game.max_num_changes_per_frame ||
10425         ChangePage[x][y] != -1)))
10426     return FALSE;
10427
10428   RECURSION_LOOP_DETECTION_START(trigger_element, FALSE);
10429
10430   for (p = 0; p < element_info[element].num_change_pages; p++)
10431   {
10432     struct ElementChangeInfo *change = &element_info[element].change_page[p];
10433
10434     /* check trigger element for all events where the element that is checked
10435        for changing interacts with a directly adjacent element -- this is
10436        different to element changes that affect other elements to change on the
10437        whole playfield (which is handeld by CheckTriggeredElementChangeExt()) */
10438     boolean check_trigger_element =
10439       (trigger_event == CE_TOUCHING_X ||
10440        trigger_event == CE_HITTING_X ||
10441        trigger_event == CE_HIT_BY_X ||
10442        trigger_event == CE_DIGGING_X); /* this one was forgotten until 3.2.3 */
10443
10444     if (change->can_change_or_has_action &&
10445         change->has_event[trigger_event] &&
10446         change->trigger_side & trigger_side &&
10447         change->trigger_player & trigger_player &&
10448         (!check_trigger_element ||
10449          IS_EQUAL_OR_IN_GROUP(trigger_element, change->trigger_element)))
10450     {
10451       change->actual_trigger_element = trigger_element;
10452       change->actual_trigger_player = GET_PLAYER_FROM_BITS(trigger_player);
10453       change->actual_trigger_player_bits = trigger_player;
10454       change->actual_trigger_side = trigger_side;
10455       change->actual_trigger_ce_value = CustomValue[x][y];
10456       change->actual_trigger_ce_score = GET_CE_SCORE(trigger_element);
10457
10458       /* special case: trigger element not at (x,y) position for some events */
10459       if (check_trigger_element)
10460       {
10461         static struct
10462         {
10463           int dx, dy;
10464         } move_xy[] =
10465           {
10466             {  0,  0 },
10467             { -1,  0 },
10468             { +1,  0 },
10469             {  0,  0 },
10470             {  0, -1 },
10471             {  0,  0 }, { 0, 0 }, { 0, 0 },
10472             {  0, +1 }
10473           };
10474
10475         int xx = x + move_xy[MV_DIR_OPPOSITE(trigger_side)].dx;
10476         int yy = y + move_xy[MV_DIR_OPPOSITE(trigger_side)].dy;
10477
10478         change->actual_trigger_ce_value = CustomValue[xx][yy];
10479         change->actual_trigger_ce_score = GET_CE_SCORE(trigger_element);
10480       }
10481
10482       if (change->can_change && !change_done)
10483       {
10484         ChangeDelay[x][y] = 1;
10485         ChangeEvent[x][y] = trigger_event;
10486
10487         HandleElementChange(x, y, p);
10488
10489         change_done = TRUE;
10490       }
10491       else if (change->has_action)
10492       {
10493         ExecuteCustomElementAction(x, y, element, p);
10494         PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + p);
10495       }
10496     }
10497   }
10498
10499   RECURSION_LOOP_DETECTION_END();
10500
10501   return change_done;
10502 }
10503
10504 static void PlayPlayerSound(struct PlayerInfo *player)
10505 {
10506   int jx = player->jx, jy = player->jy;
10507   int sound_element = player->artwork_element;
10508   int last_action = player->last_action_waiting;
10509   int action = player->action_waiting;
10510
10511   if (player->is_waiting)
10512   {
10513     if (action != last_action)
10514       PlayLevelSoundElementAction(jx, jy, sound_element, action);
10515     else
10516       PlayLevelSoundElementActionIfLoop(jx, jy, sound_element, action);
10517   }
10518   else
10519   {
10520     if (action != last_action)
10521       StopSound(element_info[sound_element].sound[last_action]);
10522
10523     if (last_action == ACTION_SLEEPING)
10524       PlayLevelSoundElementAction(jx, jy, sound_element, ACTION_AWAKENING);
10525   }
10526 }
10527
10528 static void PlayAllPlayersSound()
10529 {
10530   int i;
10531
10532   for (i = 0; i < MAX_PLAYERS; i++)
10533     if (stored_player[i].active)
10534       PlayPlayerSound(&stored_player[i]);
10535 }
10536
10537 static void SetPlayerWaiting(struct PlayerInfo *player, boolean is_waiting)
10538 {
10539   boolean last_waiting = player->is_waiting;
10540   int move_dir = player->MovDir;
10541
10542   player->dir_waiting = move_dir;
10543   player->last_action_waiting = player->action_waiting;
10544
10545   if (is_waiting)
10546   {
10547     if (!last_waiting)          /* not waiting -> waiting */
10548     {
10549       player->is_waiting = TRUE;
10550
10551       player->frame_counter_bored =
10552         FrameCounter +
10553         game.player_boring_delay_fixed +
10554         GetSimpleRandom(game.player_boring_delay_random);
10555       player->frame_counter_sleeping =
10556         FrameCounter +
10557         game.player_sleeping_delay_fixed +
10558         GetSimpleRandom(game.player_sleeping_delay_random);
10559
10560       InitPlayerGfxAnimation(player, ACTION_WAITING, move_dir);
10561     }
10562
10563     if (game.player_sleeping_delay_fixed +
10564         game.player_sleeping_delay_random > 0 &&
10565         player->anim_delay_counter == 0 &&
10566         player->post_delay_counter == 0 &&
10567         FrameCounter >= player->frame_counter_sleeping)
10568       player->is_sleeping = TRUE;
10569     else if (game.player_boring_delay_fixed +
10570              game.player_boring_delay_random > 0 &&
10571              FrameCounter >= player->frame_counter_bored)
10572       player->is_bored = TRUE;
10573
10574     player->action_waiting = (player->is_sleeping ? ACTION_SLEEPING :
10575                               player->is_bored ? ACTION_BORING :
10576                               ACTION_WAITING);
10577
10578     if (player->is_sleeping && player->use_murphy)
10579     {
10580       /* special case for sleeping Murphy when leaning against non-free tile */
10581
10582       if (!IN_LEV_FIELD(player->jx - 1, player->jy) ||
10583           (Feld[player->jx - 1][player->jy] != EL_EMPTY &&
10584            !IS_MOVING(player->jx - 1, player->jy)))
10585         move_dir = MV_LEFT;
10586       else if (!IN_LEV_FIELD(player->jx + 1, player->jy) ||
10587                (Feld[player->jx + 1][player->jy] != EL_EMPTY &&
10588                 !IS_MOVING(player->jx + 1, player->jy)))
10589         move_dir = MV_RIGHT;
10590       else
10591         player->is_sleeping = FALSE;
10592
10593       player->dir_waiting = move_dir;
10594     }
10595
10596     if (player->is_sleeping)
10597     {
10598       if (player->num_special_action_sleeping > 0)
10599       {
10600         if (player->anim_delay_counter == 0 && player->post_delay_counter == 0)
10601         {
10602           int last_special_action = player->special_action_sleeping;
10603           int num_special_action = player->num_special_action_sleeping;
10604           int special_action =
10605             (last_special_action == ACTION_DEFAULT ? ACTION_SLEEPING_1 :
10606              last_special_action == ACTION_SLEEPING ? ACTION_SLEEPING :
10607              last_special_action < ACTION_SLEEPING_1 + num_special_action - 1 ?
10608              last_special_action + 1 : ACTION_SLEEPING);
10609           int special_graphic =
10610             el_act_dir2img(player->artwork_element, special_action, move_dir);
10611
10612           player->anim_delay_counter =
10613             graphic_info[special_graphic].anim_delay_fixed +
10614             GetSimpleRandom(graphic_info[special_graphic].anim_delay_random);
10615           player->post_delay_counter =
10616             graphic_info[special_graphic].post_delay_fixed +
10617             GetSimpleRandom(graphic_info[special_graphic].post_delay_random);
10618
10619           player->special_action_sleeping = special_action;
10620         }
10621
10622         if (player->anim_delay_counter > 0)
10623         {
10624           player->action_waiting = player->special_action_sleeping;
10625           player->anim_delay_counter--;
10626         }
10627         else if (player->post_delay_counter > 0)
10628         {
10629           player->post_delay_counter--;
10630         }
10631       }
10632     }
10633     else if (player->is_bored)
10634     {
10635       if (player->num_special_action_bored > 0)
10636       {
10637         if (player->anim_delay_counter == 0 && player->post_delay_counter == 0)
10638         {
10639           int special_action =
10640             ACTION_BORING_1 + GetSimpleRandom(player->num_special_action_bored);
10641           int special_graphic =
10642             el_act_dir2img(player->artwork_element, special_action, move_dir);
10643
10644           player->anim_delay_counter =
10645             graphic_info[special_graphic].anim_delay_fixed +
10646             GetSimpleRandom(graphic_info[special_graphic].anim_delay_random);
10647           player->post_delay_counter =
10648             graphic_info[special_graphic].post_delay_fixed +
10649             GetSimpleRandom(graphic_info[special_graphic].post_delay_random);
10650
10651           player->special_action_bored = special_action;
10652         }
10653
10654         if (player->anim_delay_counter > 0)
10655         {
10656           player->action_waiting = player->special_action_bored;
10657           player->anim_delay_counter--;
10658         }
10659         else if (player->post_delay_counter > 0)
10660         {
10661           player->post_delay_counter--;
10662         }
10663       }
10664     }
10665   }
10666   else if (last_waiting)        /* waiting -> not waiting */
10667   {
10668     player->is_waiting = FALSE;
10669     player->is_bored = FALSE;
10670     player->is_sleeping = FALSE;
10671
10672     player->frame_counter_bored = -1;
10673     player->frame_counter_sleeping = -1;
10674
10675     player->anim_delay_counter = 0;
10676     player->post_delay_counter = 0;
10677
10678     player->dir_waiting = player->MovDir;
10679     player->action_waiting = ACTION_DEFAULT;
10680
10681     player->special_action_bored = ACTION_DEFAULT;
10682     player->special_action_sleeping = ACTION_DEFAULT;
10683   }
10684 }
10685
10686 static void CheckSaveEngineSnapshot(struct PlayerInfo *player)
10687 {
10688   if ((!player->is_moving  && player->was_moving) ||
10689       (player->MovPos == 0 && player->was_moving) ||
10690       (player->is_snapping && !player->was_snapping) ||
10691       (player->is_dropping && !player->was_dropping))
10692   {
10693     if (!CheckSaveEngineSnapshotToList())
10694       return;
10695
10696     player->was_moving = FALSE;
10697     player->was_snapping = TRUE;
10698     player->was_dropping = TRUE;
10699   }
10700   else
10701   {
10702     if (player->is_moving)
10703       player->was_moving = TRUE;
10704
10705     if (!player->is_snapping)
10706       player->was_snapping = FALSE;
10707
10708     if (!player->is_dropping)
10709       player->was_dropping = FALSE;
10710   }
10711 }
10712
10713 static void CheckSingleStepMode(struct PlayerInfo *player)
10714 {
10715   if (tape.single_step && tape.recording && !tape.pausing)
10716   {
10717     /* as it is called "single step mode", just return to pause mode when the
10718        player stopped moving after one tile (or never starts moving at all) */
10719     if (!player->is_moving &&
10720         !player->is_pushing &&
10721         !player->is_dropping_pressed)
10722     {
10723       TapeTogglePause(TAPE_TOGGLE_AUTOMATIC);
10724       SnapField(player, 0, 0);                  /* stop snapping */
10725     }
10726   }
10727
10728   CheckSaveEngineSnapshot(player);
10729 }
10730
10731 static byte PlayerActions(struct PlayerInfo *player, byte player_action)
10732 {
10733   int left      = player_action & JOY_LEFT;
10734   int right     = player_action & JOY_RIGHT;
10735   int up        = player_action & JOY_UP;
10736   int down      = player_action & JOY_DOWN;
10737   int button1   = player_action & JOY_BUTTON_1;
10738   int button2   = player_action & JOY_BUTTON_2;
10739   int dx        = (left ? -1 : right ? 1 : 0);
10740   int dy        = (up   ? -1 : down  ? 1 : 0);
10741
10742   if (!player->active || tape.pausing)
10743     return 0;
10744
10745   if (player_action)
10746   {
10747     if (button1)
10748       SnapField(player, dx, dy);
10749     else
10750     {
10751       if (button2)
10752         DropElement(player);
10753
10754       MovePlayer(player, dx, dy);
10755     }
10756
10757     CheckSingleStepMode(player);
10758
10759     SetPlayerWaiting(player, FALSE);
10760
10761     return player_action;
10762   }
10763   else
10764   {
10765     /* no actions for this player (no input at player's configured device) */
10766
10767     DigField(player, 0, 0, 0, 0, 0, 0, DF_NO_PUSH);
10768     SnapField(player, 0, 0);
10769     CheckGravityMovementWhenNotMoving(player);
10770
10771     if (player->MovPos == 0)
10772       SetPlayerWaiting(player, TRUE);
10773
10774     if (player->MovPos == 0)    /* needed for tape.playing */
10775       player->is_moving = FALSE;
10776
10777     player->is_dropping = FALSE;
10778     player->is_dropping_pressed = FALSE;
10779     player->drop_pressed_delay = 0;
10780
10781     CheckSingleStepMode(player);
10782
10783     return 0;
10784   }
10785 }
10786
10787 static void CheckLevelTime()
10788 {
10789   int i;
10790
10791   /* !!! SAME CODE AS IN "GameActions()" -- FIX THIS !!! */
10792   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
10793   {
10794     if (level.native_em_level->lev->home == 0)  /* all players at home */
10795     {
10796       PlayerWins(local_player);
10797
10798       AllPlayersGone = TRUE;
10799
10800       level.native_em_level->lev->home = -1;
10801     }
10802
10803     if (level.native_em_level->ply[0]->alive == 0 &&
10804         level.native_em_level->ply[1]->alive == 0 &&
10805         level.native_em_level->ply[2]->alive == 0 &&
10806         level.native_em_level->ply[3]->alive == 0)      /* all dead */
10807       AllPlayersGone = TRUE;
10808   }
10809   else if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
10810   {
10811     if (game_sp.LevelSolved &&
10812         !game_sp.GameOver)                              /* game won */
10813     {
10814       PlayerWins(local_player);
10815
10816       game_sp.GameOver = TRUE;
10817
10818       AllPlayersGone = TRUE;
10819     }
10820
10821     if (game_sp.GameOver)                               /* game lost */
10822       AllPlayersGone = TRUE;
10823   }
10824
10825   if (TimeFrames >= FRAMES_PER_SECOND)
10826   {
10827     TimeFrames = 0;
10828     TapeTime++;
10829
10830     for (i = 0; i < MAX_PLAYERS; i++)
10831     {
10832       struct PlayerInfo *player = &stored_player[i];
10833
10834       if (SHIELD_ON(player))
10835       {
10836         player->shield_normal_time_left--;
10837
10838         if (player->shield_deadly_time_left > 0)
10839           player->shield_deadly_time_left--;
10840       }
10841     }
10842
10843     if (!local_player->LevelSolved && !level.use_step_counter)
10844     {
10845       TimePlayed++;
10846
10847       if (TimeLeft > 0)
10848       {
10849         TimeLeft--;
10850
10851         if (TimeLeft <= 10 && setup.time_limit)
10852           PlaySound(SND_GAME_RUNNING_OUT_OF_TIME);
10853
10854         /* this does not make sense: game_panel_controls[GAME_PANEL_TIME].value
10855            is reset from other values in UpdateGameDoorValues() -- FIX THIS */
10856
10857         game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
10858
10859         if (!TimeLeft && setup.time_limit)
10860         {
10861           if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
10862             level.native_em_level->lev->killed_out_of_time = TRUE;
10863           else
10864             for (i = 0; i < MAX_PLAYERS; i++)
10865               KillPlayer(&stored_player[i]);
10866         }
10867       }
10868       else if (game.no_time_limit && !AllPlayersGone) /* level w/o time limit */
10869       {
10870         game_panel_controls[GAME_PANEL_TIME].value = TimePlayed;
10871       }
10872
10873       level.native_em_level->lev->time =
10874         (game.no_time_limit ? TimePlayed : TimeLeft);
10875     }
10876
10877     if (tape.recording || tape.playing)
10878       DrawVideoDisplay(VIDEO_STATE_TIME_ON, TapeTime);
10879   }
10880
10881   if (tape.recording || tape.playing)
10882     DrawVideoDisplay(VIDEO_STATE_FRAME_ON, FrameCounter);
10883
10884   UpdateAndDisplayGameControlValues();
10885 }
10886
10887 void AdvanceFrameAndPlayerCounters(int player_nr)
10888 {
10889   int i;
10890
10891   /* advance frame counters (global frame counter and time frame counter) */
10892   FrameCounter++;
10893   TimeFrames++;
10894
10895   /* advance player counters (counters for move delay, move animation etc.) */
10896   for (i = 0; i < MAX_PLAYERS; i++)
10897   {
10898     boolean advance_player_counters = (player_nr == -1 || player_nr == i);
10899     int move_delay_value = stored_player[i].move_delay_value;
10900     int move_frames = MOVE_DELAY_NORMAL_SPEED / move_delay_value;
10901
10902     if (!advance_player_counters)       /* not all players may be affected */
10903       continue;
10904
10905     if (move_frames == 0)       /* less than one move per game frame */
10906     {
10907       int stepsize = TILEX / move_delay_value;
10908       int delay = move_delay_value / MOVE_DELAY_NORMAL_SPEED;
10909       int count = (stored_player[i].is_moving ?
10910                    ABS(stored_player[i].MovPos) / stepsize : FrameCounter);
10911
10912       if (count % delay == 0)
10913         move_frames = 1;
10914     }
10915
10916     stored_player[i].Frame += move_frames;
10917
10918     if (stored_player[i].MovPos != 0)
10919       stored_player[i].StepFrame += move_frames;
10920
10921     if (stored_player[i].move_delay > 0)
10922       stored_player[i].move_delay--;
10923
10924     /* due to bugs in previous versions, counter must count up, not down */
10925     if (stored_player[i].push_delay != -1)
10926       stored_player[i].push_delay++;
10927
10928     if (stored_player[i].drop_delay > 0)
10929       stored_player[i].drop_delay--;
10930
10931     if (stored_player[i].is_dropping_pressed)
10932       stored_player[i].drop_pressed_delay++;
10933   }
10934 }
10935
10936 void StartGameActions(boolean init_network_game, boolean record_tape,
10937                       int random_seed)
10938 {
10939   unsigned int new_random_seed = InitRND(random_seed);
10940
10941   if (record_tape)
10942     TapeStartRecording(new_random_seed);
10943
10944 #if defined(NETWORK_AVALIABLE)
10945   if (init_network_game)
10946   {
10947     SendToServer_StartPlaying();
10948
10949     return;
10950   }
10951 #endif
10952
10953   InitGame();
10954 }
10955
10956 void GameActionsExt()
10957 {
10958 #if 0
10959   static unsigned int game_frame_delay = 0;
10960 #endif
10961   unsigned int game_frame_delay_value;
10962   byte *recorded_player_action;
10963   byte summarized_player_action = 0;
10964   byte tape_action[MAX_PLAYERS];
10965   int i;
10966
10967   /* detect endless loops, caused by custom element programming */
10968   if (recursion_loop_detected && recursion_loop_depth == 0)
10969   {
10970     char *message = getStringCat3("Internal Error! Element ",
10971                                   EL_NAME(recursion_loop_element),
10972                                   " caused endless loop! Quit the game?");
10973
10974     Error(ERR_WARN, "element '%s' caused endless loop in game engine",
10975           EL_NAME(recursion_loop_element));
10976
10977     RequestQuitGameExt(FALSE, level_editor_test_game, message);
10978
10979     recursion_loop_detected = FALSE;    /* if game should be continued */
10980
10981     free(message);
10982
10983     return;
10984   }
10985
10986   if (game.restart_level)
10987     StartGameActions(options.network, setup.autorecord, level.random_seed);
10988
10989   /* !!! SAME CODE AS IN "CheckLevelTime()" -- FIX THIS !!! */
10990   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
10991   {
10992     if (level.native_em_level->lev->home == 0)  /* all players at home */
10993     {
10994       PlayerWins(local_player);
10995
10996       AllPlayersGone = TRUE;
10997
10998       level.native_em_level->lev->home = -1;
10999     }
11000
11001     if (level.native_em_level->ply[0]->alive == 0 &&
11002         level.native_em_level->ply[1]->alive == 0 &&
11003         level.native_em_level->ply[2]->alive == 0 &&
11004         level.native_em_level->ply[3]->alive == 0)      /* all dead */
11005       AllPlayersGone = TRUE;
11006   }
11007   else if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
11008   {
11009     if (game_sp.LevelSolved &&
11010         !game_sp.GameOver)                              /* game won */
11011     {
11012       PlayerWins(local_player);
11013
11014       game_sp.GameOver = TRUE;
11015
11016       AllPlayersGone = TRUE;
11017     }
11018
11019     if (game_sp.GameOver)                               /* game lost */
11020       AllPlayersGone = TRUE;
11021   }
11022
11023   if (local_player->LevelSolved && !local_player->LevelSolved_GameEnd)
11024     GameWon();
11025
11026   if (AllPlayersGone && !TAPE_IS_STOPPED(tape))
11027     TapeStop();
11028
11029   if (game_status != GAME_MODE_PLAYING)         /* status might have changed */
11030     return;
11031
11032   game_frame_delay_value =
11033     (tape.playing && tape.fast_forward ? FfwdFrameDelay : GameFrameDelay);
11034
11035   if (tape.playing && tape.warp_forward && !tape.pausing)
11036     game_frame_delay_value = 0;
11037
11038   SetVideoFrameDelay(game_frame_delay_value);
11039
11040 #if 0
11041 #if 0
11042   /* ---------- main game synchronization point ---------- */
11043
11044   int skip = WaitUntilDelayReached(&game_frame_delay, game_frame_delay_value);
11045
11046   printf("::: skip == %d\n", skip);
11047
11048 #else
11049   /* ---------- main game synchronization point ---------- */
11050
11051   WaitUntilDelayReached(&game_frame_delay, game_frame_delay_value);
11052 #endif
11053 #endif
11054
11055   if (network_playing && !network_player_action_received)
11056   {
11057     /* try to get network player actions in time */
11058
11059 #if defined(NETWORK_AVALIABLE)
11060     /* last chance to get network player actions without main loop delay */
11061     HandleNetworking();
11062 #endif
11063
11064     /* game was quit by network peer */
11065     if (game_status != GAME_MODE_PLAYING)
11066       return;
11067
11068     if (!network_player_action_received)
11069       return;           /* failed to get network player actions in time */
11070
11071     /* do not yet reset "network_player_action_received" (for tape.pausing) */
11072   }
11073
11074   if (tape.pausing)
11075     return;
11076
11077   /* at this point we know that we really continue executing the game */
11078
11079   network_player_action_received = FALSE;
11080
11081   /* when playing tape, read previously recorded player input from tape data */
11082   recorded_player_action = (tape.playing ? TapePlayAction() : NULL);
11083
11084   /* TapePlayAction() may return NULL when toggling to "pause before death" */
11085   if (tape.pausing)
11086     return;
11087
11088   if (tape.set_centered_player)
11089   {
11090     game.centered_player_nr_next = tape.centered_player_nr_next;
11091     game.set_centered_player = TRUE;
11092   }
11093
11094   for (i = 0; i < MAX_PLAYERS; i++)
11095   {
11096     summarized_player_action |= stored_player[i].action;
11097
11098     if (!network_playing && (game.team_mode || tape.playing))
11099       stored_player[i].effective_action = stored_player[i].action;
11100   }
11101
11102 #if defined(NETWORK_AVALIABLE)
11103   if (network_playing)
11104     SendToServer_MovePlayer(summarized_player_action);
11105 #endif
11106
11107   // summarize all actions at local players mapped input device position
11108   // (this allows using different input devices in single player mode)
11109   if (!options.network && !game.team_mode)
11110     stored_player[map_player_action[local_player->index_nr]].effective_action =
11111       summarized_player_action;
11112
11113   if (tape.recording &&
11114       setup.team_mode &&
11115       setup.input_on_focus &&
11116       game.centered_player_nr != -1)
11117   {
11118     for (i = 0; i < MAX_PLAYERS; i++)
11119       stored_player[i].effective_action =
11120         (i == game.centered_player_nr ? summarized_player_action : 0);
11121   }
11122
11123   if (recorded_player_action != NULL)
11124     for (i = 0; i < MAX_PLAYERS; i++)
11125       stored_player[i].effective_action = recorded_player_action[i];
11126
11127   for (i = 0; i < MAX_PLAYERS; i++)
11128   {
11129     tape_action[i] = stored_player[i].effective_action;
11130
11131     /* (this may happen in the RND game engine if a player was not present on
11132        the playfield on level start, but appeared later from a custom element */
11133     if (setup.team_mode &&
11134         tape.recording &&
11135         tape_action[i] &&
11136         !tape.player_participates[i])
11137       tape.player_participates[i] = TRUE;
11138   }
11139
11140   /* only record actions from input devices, but not programmed actions */
11141   if (tape.recording)
11142     TapeRecordAction(tape_action);
11143
11144 #if USE_NEW_PLAYER_ASSIGNMENTS
11145   // !!! also map player actions in single player mode !!!
11146   // if (game.team_mode)
11147   if (1)
11148   {
11149     byte mapped_action[MAX_PLAYERS];
11150
11151 #if DEBUG_PLAYER_ACTIONS
11152     printf(":::");
11153     for (i = 0; i < MAX_PLAYERS; i++)
11154       printf(" %d, ", stored_player[i].effective_action);
11155 #endif
11156
11157     for (i = 0; i < MAX_PLAYERS; i++)
11158       mapped_action[i] = stored_player[map_player_action[i]].effective_action;
11159
11160     for (i = 0; i < MAX_PLAYERS; i++)
11161       stored_player[i].effective_action = mapped_action[i];
11162
11163 #if DEBUG_PLAYER_ACTIONS
11164     printf(" =>");
11165     for (i = 0; i < MAX_PLAYERS; i++)
11166       printf(" %d, ", stored_player[i].effective_action);
11167     printf("\n");
11168 #endif
11169   }
11170 #if DEBUG_PLAYER_ACTIONS
11171   else
11172   {
11173     printf(":::");
11174     for (i = 0; i < MAX_PLAYERS; i++)
11175       printf(" %d, ", stored_player[i].effective_action);
11176     printf("\n");
11177   }
11178 #endif
11179 #endif
11180
11181   for (i = 0; i < MAX_PLAYERS; i++)
11182   {
11183     // allow engine snapshot in case of changed movement attempt
11184     if ((game.snapshot.last_action[i] & KEY_MOTION) !=
11185         (stored_player[i].effective_action & KEY_MOTION))
11186       game.snapshot.changed_action = TRUE;
11187
11188     // allow engine snapshot in case of snapping/dropping attempt
11189     if ((game.snapshot.last_action[i] & KEY_BUTTON) == 0 &&
11190         (stored_player[i].effective_action & KEY_BUTTON) != 0)
11191       game.snapshot.changed_action = TRUE;
11192
11193     game.snapshot.last_action[i] = stored_player[i].effective_action;
11194   }
11195
11196   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
11197   {
11198     GameActions_EM_Main();
11199   }
11200   else if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
11201   {
11202     GameActions_SP_Main();
11203   }
11204   else
11205   {
11206     GameActions_RND_Main();
11207   }
11208
11209   BlitScreenToBitmap(backbuffer);
11210
11211   CheckLevelTime();
11212
11213   AdvanceFrameAndPlayerCounters(-1);    /* advance counters for all players */
11214
11215   if (options.debug)                    /* calculate frames per second */
11216   {
11217     static unsigned int fps_counter = 0;
11218     static int fps_frames = 0;
11219     unsigned int fps_delay_ms = Counter() - fps_counter;
11220
11221     fps_frames++;
11222
11223     if (fps_delay_ms >= 500)    /* calculate fps every 0.5 seconds */
11224     {
11225       global.frames_per_second = 1000 * (float)fps_frames / fps_delay_ms;
11226
11227       fps_frames = 0;
11228       fps_counter = Counter();
11229     }
11230
11231     redraw_mask |= REDRAW_FPS;
11232   }
11233 }
11234
11235 static void GameActions_CheckSaveEngineSnapshot()
11236 {
11237   if (!game.snapshot.save_snapshot)
11238     return;
11239
11240   // clear flag for saving snapshot _before_ saving snapshot
11241   game.snapshot.save_snapshot = FALSE;
11242
11243   SaveEngineSnapshotToList();
11244 }
11245
11246 void GameActions()
11247 {
11248   GameActionsExt();
11249
11250   GameActions_CheckSaveEngineSnapshot();
11251 }
11252
11253 void GameActions_EM_Main()
11254 {
11255   byte effective_action[MAX_PLAYERS];
11256   boolean warp_mode = (tape.playing && tape.warp_forward && !tape.pausing);
11257   int i;
11258
11259   for (i = 0; i < MAX_PLAYERS; i++)
11260     effective_action[i] = stored_player[i].effective_action;
11261
11262   GameActions_EM(effective_action, warp_mode);
11263 }
11264
11265 void GameActions_SP_Main()
11266 {
11267   byte effective_action[MAX_PLAYERS];
11268   boolean warp_mode = (tape.playing && tape.warp_forward && !tape.pausing);
11269   int i;
11270
11271   for (i = 0; i < MAX_PLAYERS; i++)
11272     effective_action[i] = stored_player[i].effective_action;
11273
11274   GameActions_SP(effective_action, warp_mode);
11275
11276   for (i = 0; i < MAX_PLAYERS; i++)
11277   {
11278     if (stored_player[i].force_dropping)
11279       stored_player[i].action |= KEY_BUTTON_DROP;
11280
11281     stored_player[i].force_dropping = FALSE;
11282   }
11283 }
11284
11285 void GameActions_RND_Main()
11286 {
11287   GameActions_RND();
11288 }
11289
11290 void GameActions_RND()
11291 {
11292   int magic_wall_x = 0, magic_wall_y = 0;
11293   int i, x, y, element, graphic, last_gfx_frame;
11294
11295   InitPlayfieldScanModeVars();
11296
11297   if (game.engine_version >= VERSION_IDENT(3,2,0,7))
11298   {
11299     SCAN_PLAYFIELD(x, y)
11300     {
11301       ChangeCount[x][y] = 0;
11302       ChangeEvent[x][y] = -1;
11303     }
11304   }
11305
11306   if (game.set_centered_player)
11307   {
11308     boolean all_players_fit_to_screen = checkIfAllPlayersFitToScreen_RND();
11309
11310     /* switching to "all players" only possible if all players fit to screen */
11311     if (game.centered_player_nr_next == -1 && !all_players_fit_to_screen)
11312     {
11313       game.centered_player_nr_next = game.centered_player_nr;
11314       game.set_centered_player = FALSE;
11315     }
11316
11317     /* do not switch focus to non-existing (or non-active) player */
11318     if (game.centered_player_nr_next >= 0 &&
11319         !stored_player[game.centered_player_nr_next].active)
11320     {
11321       game.centered_player_nr_next = game.centered_player_nr;
11322       game.set_centered_player = FALSE;
11323     }
11324   }
11325
11326   if (game.set_centered_player &&
11327       ScreenMovPos == 0)        /* screen currently aligned at tile position */
11328   {
11329     int sx, sy;
11330
11331     if (game.centered_player_nr_next == -1)
11332     {
11333       setScreenCenteredToAllPlayers(&sx, &sy);
11334     }
11335     else
11336     {
11337       sx = stored_player[game.centered_player_nr_next].jx;
11338       sy = stored_player[game.centered_player_nr_next].jy;
11339     }
11340
11341     game.centered_player_nr = game.centered_player_nr_next;
11342     game.set_centered_player = FALSE;
11343
11344     DrawRelocateScreen(0, 0, sx, sy, MV_NONE, TRUE, setup.quick_switch);
11345     DrawGameDoorValues();
11346   }
11347
11348   for (i = 0; i < MAX_PLAYERS; i++)
11349   {
11350     int actual_player_action = stored_player[i].effective_action;
11351
11352 #if 1
11353     /* !!! THIS BREAKS THE FOLLOWING TAPES: !!!
11354        - rnd_equinox_tetrachloride 048
11355        - rnd_equinox_tetrachloride_ii 096
11356        - rnd_emanuel_schmieg 002
11357        - doctor_sloan_ww 001, 020
11358     */
11359     if (stored_player[i].MovPos == 0)
11360       CheckGravityMovement(&stored_player[i]);
11361 #endif
11362
11363     /* overwrite programmed action with tape action */
11364     if (stored_player[i].programmed_action)
11365       actual_player_action = stored_player[i].programmed_action;
11366
11367     PlayerActions(&stored_player[i], actual_player_action);
11368
11369     ScrollPlayer(&stored_player[i], SCROLL_GO_ON);
11370   }
11371
11372   ScrollScreen(NULL, SCROLL_GO_ON);
11373
11374   /* for backwards compatibility, the following code emulates a fixed bug that
11375      occured when pushing elements (causing elements that just made their last
11376      pushing step to already (if possible) make their first falling step in the
11377      same game frame, which is bad); this code is also needed to use the famous
11378      "spring push bug" which is used in older levels and might be wanted to be
11379      used also in newer levels, but in this case the buggy pushing code is only
11380      affecting the "spring" element and no other elements */
11381
11382   if (game.engine_version < VERSION_IDENT(2,2,0,7) || level.use_spring_bug)
11383   {
11384     for (i = 0; i < MAX_PLAYERS; i++)
11385     {
11386       struct PlayerInfo *player = &stored_player[i];
11387       int x = player->jx;
11388       int y = player->jy;
11389
11390       if (player->active && player->is_pushing && player->is_moving &&
11391           IS_MOVING(x, y) &&
11392           (game.engine_version < VERSION_IDENT(2,2,0,7) ||
11393            Feld[x][y] == EL_SPRING))
11394       {
11395         ContinueMoving(x, y);
11396
11397         /* continue moving after pushing (this is actually a bug) */
11398         if (!IS_MOVING(x, y))
11399           Stop[x][y] = FALSE;
11400       }
11401     }
11402   }
11403
11404   SCAN_PLAYFIELD(x, y)
11405   {
11406     ChangeCount[x][y] = 0;
11407     ChangeEvent[x][y] = -1;
11408
11409     /* this must be handled before main playfield loop */
11410     if (Feld[x][y] == EL_PLAYER_IS_LEAVING)
11411     {
11412       MovDelay[x][y]--;
11413       if (MovDelay[x][y] <= 0)
11414         RemoveField(x, y);
11415     }
11416
11417     if (Feld[x][y] == EL_ELEMENT_SNAPPING)
11418     {
11419       MovDelay[x][y]--;
11420       if (MovDelay[x][y] <= 0)
11421       {
11422         RemoveField(x, y);
11423         TEST_DrawLevelField(x, y);
11424
11425         TestIfElementTouchesCustomElement(x, y);        /* for empty space */
11426       }
11427     }
11428
11429 #if DEBUG
11430     if (ChangePage[x][y] != -1 && ChangeDelay[x][y] != 1)
11431     {
11432       printf("GameActions(): x = %d, y = %d: ChangePage != -1\n", x, y);
11433       printf("GameActions(): This should never happen!\n");
11434
11435       ChangePage[x][y] = -1;
11436     }
11437 #endif
11438
11439     Stop[x][y] = FALSE;
11440     if (WasJustMoving[x][y] > 0)
11441       WasJustMoving[x][y]--;
11442     if (WasJustFalling[x][y] > 0)
11443       WasJustFalling[x][y]--;
11444     if (CheckCollision[x][y] > 0)
11445       CheckCollision[x][y]--;
11446     if (CheckImpact[x][y] > 0)
11447       CheckImpact[x][y]--;
11448
11449     GfxFrame[x][y]++;
11450
11451     /* reset finished pushing action (not done in ContinueMoving() to allow
11452        continuous pushing animation for elements with zero push delay) */
11453     if (GfxAction[x][y] == ACTION_PUSHING && !IS_MOVING(x, y))
11454     {
11455       ResetGfxAnimation(x, y);
11456       TEST_DrawLevelField(x, y);
11457     }
11458
11459 #if DEBUG
11460     if (IS_BLOCKED(x, y))
11461     {
11462       int oldx, oldy;
11463
11464       Blocked2Moving(x, y, &oldx, &oldy);
11465       if (!IS_MOVING(oldx, oldy))
11466       {
11467         printf("GameActions(): (BLOCKED => MOVING) context corrupted!\n");
11468         printf("GameActions(): BLOCKED: x = %d, y = %d\n", x, y);
11469         printf("GameActions(): !MOVING: oldx = %d, oldy = %d\n", oldx, oldy);
11470         printf("GameActions(): This should never happen!\n");
11471       }
11472     }
11473 #endif
11474   }
11475
11476   SCAN_PLAYFIELD(x, y)
11477   {
11478     element = Feld[x][y];
11479     graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
11480     last_gfx_frame = GfxFrame[x][y];
11481
11482     ResetGfxFrame(x, y);
11483
11484     if (GfxFrame[x][y] != last_gfx_frame && !Stop[x][y])
11485       DrawLevelGraphicAnimation(x, y, graphic);
11486
11487     if (ANIM_MODE(graphic) == ANIM_RANDOM &&
11488         IS_NEXT_FRAME(GfxFrame[x][y], graphic))
11489       ResetRandomAnimationValue(x, y);
11490
11491     SetRandomAnimationValue(x, y);
11492
11493     PlayLevelSoundActionIfLoop(x, y, GfxAction[x][y]);
11494
11495     if (IS_INACTIVE(element))
11496     {
11497       if (IS_ANIMATED(graphic))
11498         DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
11499
11500       continue;
11501     }
11502
11503     /* this may take place after moving, so 'element' may have changed */
11504     if (IS_CHANGING(x, y) &&
11505         (game.engine_version < VERSION_IDENT(3,0,7,1) || !Stop[x][y]))
11506     {
11507       int page = element_info[element].event_page_nr[CE_DELAY];
11508
11509       HandleElementChange(x, y, page);
11510
11511       element = Feld[x][y];
11512       graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
11513     }
11514
11515     if (!IS_MOVING(x, y) && (CAN_FALL(element) || CAN_MOVE(element)))
11516     {
11517       StartMoving(x, y);
11518
11519       element = Feld[x][y];
11520       graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
11521
11522       if (IS_ANIMATED(graphic) &&
11523           !IS_MOVING(x, y) &&
11524           !Stop[x][y])
11525         DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
11526
11527       if (IS_GEM(element) || element == EL_SP_INFOTRON)
11528         TEST_DrawTwinkleOnField(x, y);
11529     }
11530     else if (element == EL_ACID)
11531     {
11532       if (!Stop[x][y])
11533         DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
11534     }
11535     else if ((element == EL_EXIT_OPEN ||
11536               element == EL_EM_EXIT_OPEN ||
11537               element == EL_SP_EXIT_OPEN ||
11538               element == EL_STEEL_EXIT_OPEN ||
11539               element == EL_EM_STEEL_EXIT_OPEN ||
11540               element == EL_SP_TERMINAL ||
11541               element == EL_SP_TERMINAL_ACTIVE ||
11542               element == EL_EXTRA_TIME ||
11543               element == EL_SHIELD_NORMAL ||
11544               element == EL_SHIELD_DEADLY) &&
11545              IS_ANIMATED(graphic))
11546       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
11547     else if (IS_MOVING(x, y))
11548       ContinueMoving(x, y);
11549     else if (IS_ACTIVE_BOMB(element))
11550       CheckDynamite(x, y);
11551     else if (element == EL_AMOEBA_GROWING)
11552       AmoebeWaechst(x, y);
11553     else if (element == EL_AMOEBA_SHRINKING)
11554       AmoebaDisappearing(x, y);
11555
11556 #if !USE_NEW_AMOEBA_CODE
11557     else if (IS_AMOEBALIVE(element))
11558       AmoebeAbleger(x, y);
11559 #endif
11560
11561     else if (element == EL_GAME_OF_LIFE || element == EL_BIOMAZE)
11562       Life(x, y);
11563     else if (element == EL_EXIT_CLOSED)
11564       CheckExit(x, y);
11565     else if (element == EL_EM_EXIT_CLOSED)
11566       CheckExitEM(x, y);
11567     else if (element == EL_STEEL_EXIT_CLOSED)
11568       CheckExitSteel(x, y);
11569     else if (element == EL_EM_STEEL_EXIT_CLOSED)
11570       CheckExitSteelEM(x, y);
11571     else if (element == EL_SP_EXIT_CLOSED)
11572       CheckExitSP(x, y);
11573     else if (element == EL_EXPANDABLE_WALL_GROWING ||
11574              element == EL_EXPANDABLE_STEELWALL_GROWING)
11575       MauerWaechst(x, y);
11576     else if (element == EL_EXPANDABLE_WALL ||
11577              element == EL_EXPANDABLE_WALL_HORIZONTAL ||
11578              element == EL_EXPANDABLE_WALL_VERTICAL ||
11579              element == EL_EXPANDABLE_WALL_ANY ||
11580              element == EL_BD_EXPANDABLE_WALL)
11581       MauerAbleger(x, y);
11582     else if (element == EL_EXPANDABLE_STEELWALL_HORIZONTAL ||
11583              element == EL_EXPANDABLE_STEELWALL_VERTICAL ||
11584              element == EL_EXPANDABLE_STEELWALL_ANY)
11585       MauerAblegerStahl(x, y);
11586     else if (element == EL_FLAMES)
11587       CheckForDragon(x, y);
11588     else if (element == EL_EXPLOSION)
11589       ; /* drawing of correct explosion animation is handled separately */
11590     else if (element == EL_ELEMENT_SNAPPING ||
11591              element == EL_DIAGONAL_SHRINKING ||
11592              element == EL_DIAGONAL_GROWING)
11593     {
11594       graphic = el_act_dir2img(GfxElement[x][y], GfxAction[x][y],GfxDir[x][y]);
11595
11596       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
11597     }
11598     else if (IS_ANIMATED(graphic) && !IS_CHANGING(x, y))
11599       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
11600
11601     if (IS_BELT_ACTIVE(element))
11602       PlayLevelSoundAction(x, y, ACTION_ACTIVE);
11603
11604     if (game.magic_wall_active)
11605     {
11606       int jx = local_player->jx, jy = local_player->jy;
11607
11608       /* play the element sound at the position nearest to the player */
11609       if ((element == EL_MAGIC_WALL_FULL ||
11610            element == EL_MAGIC_WALL_ACTIVE ||
11611            element == EL_MAGIC_WALL_EMPTYING ||
11612            element == EL_BD_MAGIC_WALL_FULL ||
11613            element == EL_BD_MAGIC_WALL_ACTIVE ||
11614            element == EL_BD_MAGIC_WALL_EMPTYING ||
11615            element == EL_DC_MAGIC_WALL_FULL ||
11616            element == EL_DC_MAGIC_WALL_ACTIVE ||
11617            element == EL_DC_MAGIC_WALL_EMPTYING) &&
11618           ABS(x-jx) + ABS(y-jy) < ABS(magic_wall_x-jx) + ABS(magic_wall_y-jy))
11619       {
11620         magic_wall_x = x;
11621         magic_wall_y = y;
11622       }
11623     }
11624   }
11625
11626 #if USE_NEW_AMOEBA_CODE
11627   /* new experimental amoeba growth stuff */
11628   if (!(FrameCounter % 8))
11629   {
11630     static unsigned int random = 1684108901;
11631
11632     for (i = 0; i < level.amoeba_speed * 28 / 8; i++)
11633     {
11634       x = RND(lev_fieldx);
11635       y = RND(lev_fieldy);
11636       element = Feld[x][y];
11637
11638       if (!IS_PLAYER(x,y) &&
11639           (element == EL_EMPTY ||
11640            CAN_GROW_INTO(element) ||
11641            element == EL_QUICKSAND_EMPTY ||
11642            element == EL_QUICKSAND_FAST_EMPTY ||
11643            element == EL_ACID_SPLASH_LEFT ||
11644            element == EL_ACID_SPLASH_RIGHT))
11645       {
11646         if ((IN_LEV_FIELD(x, y-1) && Feld[x][y-1] == EL_AMOEBA_WET) ||
11647             (IN_LEV_FIELD(x-1, y) && Feld[x-1][y] == EL_AMOEBA_WET) ||
11648             (IN_LEV_FIELD(x+1, y) && Feld[x+1][y] == EL_AMOEBA_WET) ||
11649             (IN_LEV_FIELD(x, y+1) && Feld[x][y+1] == EL_AMOEBA_WET))
11650           Feld[x][y] = EL_AMOEBA_DROP;
11651       }
11652
11653       random = random * 129 + 1;
11654     }
11655   }
11656 #endif
11657
11658   game.explosions_delayed = FALSE;
11659
11660   SCAN_PLAYFIELD(x, y)
11661   {
11662     element = Feld[x][y];
11663
11664     if (ExplodeField[x][y])
11665       Explode(x, y, EX_PHASE_START, ExplodeField[x][y]);
11666     else if (element == EL_EXPLOSION)
11667       Explode(x, y, ExplodePhase[x][y], EX_TYPE_NORMAL);
11668
11669     ExplodeField[x][y] = EX_TYPE_NONE;
11670   }
11671
11672   game.explosions_delayed = TRUE;
11673
11674   if (game.magic_wall_active)
11675   {
11676     if (!(game.magic_wall_time_left % 4))
11677     {
11678       int element = Feld[magic_wall_x][magic_wall_y];
11679
11680       if (element == EL_BD_MAGIC_WALL_FULL ||
11681           element == EL_BD_MAGIC_WALL_ACTIVE ||
11682           element == EL_BD_MAGIC_WALL_EMPTYING)
11683         PlayLevelSound(magic_wall_x, magic_wall_y, SND_BD_MAGIC_WALL_ACTIVE);
11684       else if (element == EL_DC_MAGIC_WALL_FULL ||
11685                element == EL_DC_MAGIC_WALL_ACTIVE ||
11686                element == EL_DC_MAGIC_WALL_EMPTYING)
11687         PlayLevelSound(magic_wall_x, magic_wall_y, SND_DC_MAGIC_WALL_ACTIVE);
11688       else
11689         PlayLevelSound(magic_wall_x, magic_wall_y, SND_MAGIC_WALL_ACTIVE);
11690     }
11691
11692     if (game.magic_wall_time_left > 0)
11693     {
11694       game.magic_wall_time_left--;
11695
11696       if (!game.magic_wall_time_left)
11697       {
11698         SCAN_PLAYFIELD(x, y)
11699         {
11700           element = Feld[x][y];
11701
11702           if (element == EL_MAGIC_WALL_ACTIVE ||
11703               element == EL_MAGIC_WALL_FULL)
11704           {
11705             Feld[x][y] = EL_MAGIC_WALL_DEAD;
11706             TEST_DrawLevelField(x, y);
11707           }
11708           else if (element == EL_BD_MAGIC_WALL_ACTIVE ||
11709                    element == EL_BD_MAGIC_WALL_FULL)
11710           {
11711             Feld[x][y] = EL_BD_MAGIC_WALL_DEAD;
11712             TEST_DrawLevelField(x, y);
11713           }
11714           else if (element == EL_DC_MAGIC_WALL_ACTIVE ||
11715                    element == EL_DC_MAGIC_WALL_FULL)
11716           {
11717             Feld[x][y] = EL_DC_MAGIC_WALL_DEAD;
11718             TEST_DrawLevelField(x, y);
11719           }
11720         }
11721
11722         game.magic_wall_active = FALSE;
11723       }
11724     }
11725   }
11726
11727   if (game.light_time_left > 0)
11728   {
11729     game.light_time_left--;
11730
11731     if (game.light_time_left == 0)
11732       RedrawAllLightSwitchesAndInvisibleElements();
11733   }
11734
11735   if (game.timegate_time_left > 0)
11736   {
11737     game.timegate_time_left--;
11738
11739     if (game.timegate_time_left == 0)
11740       CloseAllOpenTimegates();
11741   }
11742
11743   if (game.lenses_time_left > 0)
11744   {
11745     game.lenses_time_left--;
11746
11747     if (game.lenses_time_left == 0)
11748       RedrawAllInvisibleElementsForLenses();
11749   }
11750
11751   if (game.magnify_time_left > 0)
11752   {
11753     game.magnify_time_left--;
11754
11755     if (game.magnify_time_left == 0)
11756       RedrawAllInvisibleElementsForMagnifier();
11757   }
11758
11759   for (i = 0; i < MAX_PLAYERS; i++)
11760   {
11761     struct PlayerInfo *player = &stored_player[i];
11762
11763     if (SHIELD_ON(player))
11764     {
11765       if (player->shield_deadly_time_left)
11766         PlayLevelSound(player->jx, player->jy, SND_SHIELD_DEADLY_ACTIVE);
11767       else if (player->shield_normal_time_left)
11768         PlayLevelSound(player->jx, player->jy, SND_SHIELD_NORMAL_ACTIVE);
11769     }
11770   }
11771
11772 #if USE_DELAYED_GFX_REDRAW
11773   SCAN_PLAYFIELD(x, y)
11774   {
11775     if (GfxRedraw[x][y] != GFX_REDRAW_NONE)
11776     {
11777       /* !!! PROBLEM: THIS REDRAWS THE PLAYFIELD _AFTER_ THE SCAN, BUT TILES
11778          !!! MAY HAVE CHANGED AFTER BEING DRAWN DURING PLAYFIELD SCAN !!! */
11779
11780       if (GfxRedraw[x][y] & GFX_REDRAW_TILE)
11781         DrawLevelField(x, y);
11782
11783       if (GfxRedraw[x][y] & GFX_REDRAW_TILE_CRUMBLED)
11784         DrawLevelFieldCrumbled(x, y);
11785
11786       if (GfxRedraw[x][y] & GFX_REDRAW_TILE_CRUMBLED_NEIGHBOURS)
11787         DrawLevelFieldCrumbledNeighbours(x, y);
11788
11789       if (GfxRedraw[x][y] & GFX_REDRAW_TILE_TWINKLED)
11790         DrawTwinkleOnField(x, y);
11791     }
11792
11793     GfxRedraw[x][y] = GFX_REDRAW_NONE;
11794   }
11795 #endif
11796
11797   DrawAllPlayers();
11798   PlayAllPlayersSound();
11799
11800   if (local_player->show_envelope != 0 && local_player->MovPos == 0)
11801   {
11802     ShowEnvelope(local_player->show_envelope - EL_ENVELOPE_1);
11803
11804     local_player->show_envelope = 0;
11805   }
11806
11807   /* use random number generator in every frame to make it less predictable */
11808   if (game.engine_version >= VERSION_IDENT(3,1,1,0))
11809     RND(1);
11810 }
11811
11812 static boolean AllPlayersInSight(struct PlayerInfo *player, int x, int y)
11813 {
11814   int min_x = x, min_y = y, max_x = x, max_y = y;
11815   int i;
11816
11817   for (i = 0; i < MAX_PLAYERS; i++)
11818   {
11819     int jx = stored_player[i].jx, jy = stored_player[i].jy;
11820
11821     if (!stored_player[i].active || &stored_player[i] == player)
11822       continue;
11823
11824     min_x = MIN(min_x, jx);
11825     min_y = MIN(min_y, jy);
11826     max_x = MAX(max_x, jx);
11827     max_y = MAX(max_y, jy);
11828   }
11829
11830   return (max_x - min_x < SCR_FIELDX && max_y - min_y < SCR_FIELDY);
11831 }
11832
11833 static boolean AllPlayersInVisibleScreen()
11834 {
11835   int i;
11836
11837   for (i = 0; i < MAX_PLAYERS; i++)
11838   {
11839     int jx = stored_player[i].jx, jy = stored_player[i].jy;
11840
11841     if (!stored_player[i].active)
11842       continue;
11843
11844     if (!IN_VIS_FIELD(SCREENX(jx), SCREENY(jy)))
11845       return FALSE;
11846   }
11847
11848   return TRUE;
11849 }
11850
11851 void ScrollLevel(int dx, int dy)
11852 {
11853   int scroll_offset = 2 * TILEX_VAR;
11854   int x, y;
11855
11856   BlitBitmap(drawto_field, drawto_field,
11857              FX + TILEX_VAR * (dx == -1) - scroll_offset,
11858              FY + TILEY_VAR * (dy == -1) - scroll_offset,
11859              SXSIZE - TILEX_VAR * (dx != 0) + 2 * scroll_offset,
11860              SYSIZE - TILEY_VAR * (dy != 0) + 2 * scroll_offset,
11861              FX + TILEX_VAR * (dx == 1) - scroll_offset,
11862              FY + TILEY_VAR * (dy == 1) - scroll_offset);
11863
11864   if (dx != 0)
11865   {
11866     x = (dx == 1 ? BX1 : BX2);
11867     for (y = BY1; y <= BY2; y++)
11868       DrawScreenField(x, y);
11869   }
11870
11871   if (dy != 0)
11872   {
11873     y = (dy == 1 ? BY1 : BY2);
11874     for (x = BX1; x <= BX2; x++)
11875       DrawScreenField(x, y);
11876   }
11877
11878   redraw_mask |= REDRAW_FIELD;
11879 }
11880
11881 static boolean canFallDown(struct PlayerInfo *player)
11882 {
11883   int jx = player->jx, jy = player->jy;
11884
11885   return (IN_LEV_FIELD(jx, jy + 1) &&
11886           (IS_FREE(jx, jy + 1) ||
11887            (Feld[jx][jy + 1] == EL_ACID && player->can_fall_into_acid)) &&
11888           IS_WALKABLE_FROM(Feld[jx][jy], MV_DOWN) &&
11889           !IS_WALKABLE_INSIDE(Feld[jx][jy]));
11890 }
11891
11892 static boolean canPassField(int x, int y, int move_dir)
11893 {
11894   int opposite_dir = MV_DIR_OPPOSITE(move_dir);
11895   int dx = (move_dir & MV_LEFT ? -1 : move_dir & MV_RIGHT ? +1 : 0);
11896   int dy = (move_dir & MV_UP   ? -1 : move_dir & MV_DOWN  ? +1 : 0);
11897   int nextx = x + dx;
11898   int nexty = y + dy;
11899   int element = Feld[x][y];
11900
11901   return (IS_PASSABLE_FROM(element, opposite_dir) &&
11902           !CAN_MOVE(element) &&
11903           IN_LEV_FIELD(nextx, nexty) && !IS_PLAYER(nextx, nexty) &&
11904           IS_WALKABLE_FROM(Feld[nextx][nexty], move_dir) &&
11905           (level.can_pass_to_walkable || IS_FREE(nextx, nexty)));
11906 }
11907
11908 static boolean canMoveToValidFieldWithGravity(int x, int y, int move_dir)
11909 {
11910   int opposite_dir = MV_DIR_OPPOSITE(move_dir);
11911   int dx = (move_dir & MV_LEFT ? -1 : move_dir & MV_RIGHT ? +1 : 0);
11912   int dy = (move_dir & MV_UP   ? -1 : move_dir & MV_DOWN  ? +1 : 0);
11913   int newx = x + dx;
11914   int newy = y + dy;
11915
11916   return (IN_LEV_FIELD(newx, newy) && !IS_FREE_OR_PLAYER(newx, newy) &&
11917           IS_GRAVITY_REACHABLE(Feld[newx][newy]) &&
11918           (IS_DIGGABLE(Feld[newx][newy]) ||
11919            IS_WALKABLE_FROM(Feld[newx][newy], opposite_dir) ||
11920            canPassField(newx, newy, move_dir)));
11921 }
11922
11923 static void CheckGravityMovement(struct PlayerInfo *player)
11924 {
11925   if (player->gravity && !player->programmed_action)
11926   {
11927     int move_dir_horizontal = player->effective_action & MV_HORIZONTAL;
11928     int move_dir_vertical   = player->effective_action & MV_VERTICAL;
11929     boolean player_is_snapping = (player->effective_action & JOY_BUTTON_1);
11930     int jx = player->jx, jy = player->jy;
11931     boolean player_is_moving_to_valid_field =
11932       (!player_is_snapping &&
11933        (canMoveToValidFieldWithGravity(jx, jy, move_dir_horizontal) ||
11934         canMoveToValidFieldWithGravity(jx, jy, move_dir_vertical)));
11935     boolean player_can_fall_down = canFallDown(player);
11936
11937     if (player_can_fall_down &&
11938         !player_is_moving_to_valid_field)
11939       player->programmed_action = MV_DOWN;
11940   }
11941 }
11942
11943 static void CheckGravityMovementWhenNotMoving(struct PlayerInfo *player)
11944 {
11945   return CheckGravityMovement(player);
11946
11947   if (player->gravity && !player->programmed_action)
11948   {
11949     int jx = player->jx, jy = player->jy;
11950     boolean field_under_player_is_free =
11951       (IN_LEV_FIELD(jx, jy + 1) && IS_FREE(jx, jy + 1));
11952     boolean player_is_standing_on_valid_field =
11953       (IS_WALKABLE_INSIDE(Feld[jx][jy]) ||
11954        (IS_WALKABLE(Feld[jx][jy]) &&
11955         !(element_info[Feld[jx][jy]].access_direction & MV_DOWN)));
11956
11957     if (field_under_player_is_free && !player_is_standing_on_valid_field)
11958       player->programmed_action = MV_DOWN;
11959   }
11960 }
11961
11962 /*
11963   MovePlayerOneStep()
11964   -----------------------------------------------------------------------------
11965   dx, dy:               direction (non-diagonal) to try to move the player to
11966   real_dx, real_dy:     direction as read from input device (can be diagonal)
11967 */
11968
11969 boolean MovePlayerOneStep(struct PlayerInfo *player,
11970                           int dx, int dy, int real_dx, int real_dy)
11971 {
11972   int jx = player->jx, jy = player->jy;
11973   int new_jx = jx + dx, new_jy = jy + dy;
11974   int can_move;
11975   boolean player_can_move = !player->cannot_move;
11976
11977   if (!player->active || (!dx && !dy))
11978     return MP_NO_ACTION;
11979
11980   player->MovDir = (dx < 0 ? MV_LEFT :
11981                     dx > 0 ? MV_RIGHT :
11982                     dy < 0 ? MV_UP :
11983                     dy > 0 ? MV_DOWN :  MV_NONE);
11984
11985   if (!IN_LEV_FIELD(new_jx, new_jy))
11986     return MP_NO_ACTION;
11987
11988   if (!player_can_move)
11989   {
11990     if (player->MovPos == 0)
11991     {
11992       player->is_moving = FALSE;
11993       player->is_digging = FALSE;
11994       player->is_collecting = FALSE;
11995       player->is_snapping = FALSE;
11996       player->is_pushing = FALSE;
11997     }
11998   }
11999
12000   if (!options.network && game.centered_player_nr == -1 &&
12001       !AllPlayersInSight(player, new_jx, new_jy))
12002     return MP_NO_ACTION;
12003
12004   can_move = DigField(player, jx, jy, new_jx, new_jy, real_dx,real_dy, DF_DIG);
12005   if (can_move != MP_MOVING)
12006     return can_move;
12007
12008   /* check if DigField() has caused relocation of the player */
12009   if (player->jx != jx || player->jy != jy)
12010     return MP_NO_ACTION;        /* <-- !!! CHECK THIS [-> MP_ACTION ?] !!! */
12011
12012   StorePlayer[jx][jy] = 0;
12013   player->last_jx = jx;
12014   player->last_jy = jy;
12015   player->jx = new_jx;
12016   player->jy = new_jy;
12017   StorePlayer[new_jx][new_jy] = player->element_nr;
12018
12019   if (player->move_delay_value_next != -1)
12020   {
12021     player->move_delay_value = player->move_delay_value_next;
12022     player->move_delay_value_next = -1;
12023   }
12024
12025   player->MovPos =
12026     (dx > 0 || dy > 0 ? -1 : 1) * (TILEX - TILEX / player->move_delay_value);
12027
12028   player->step_counter++;
12029
12030   PlayerVisit[jx][jy] = FrameCounter;
12031
12032   player->is_moving = TRUE;
12033
12034 #if 1
12035   /* should better be called in MovePlayer(), but this breaks some tapes */
12036   ScrollPlayer(player, SCROLL_INIT);
12037 #endif
12038
12039   return MP_MOVING;
12040 }
12041
12042 boolean MovePlayer(struct PlayerInfo *player, int dx, int dy)
12043 {
12044   int jx = player->jx, jy = player->jy;
12045   int old_jx = jx, old_jy = jy;
12046   int moved = MP_NO_ACTION;
12047
12048   if (!player->active)
12049     return FALSE;
12050
12051   if (!dx && !dy)
12052   {
12053     if (player->MovPos == 0)
12054     {
12055       player->is_moving = FALSE;
12056       player->is_digging = FALSE;
12057       player->is_collecting = FALSE;
12058       player->is_snapping = FALSE;
12059       player->is_pushing = FALSE;
12060     }
12061
12062     return FALSE;
12063   }
12064
12065   if (player->move_delay > 0)
12066     return FALSE;
12067
12068   player->move_delay = -1;              /* set to "uninitialized" value */
12069
12070   /* store if player is automatically moved to next field */
12071   player->is_auto_moving = (player->programmed_action != MV_NONE);
12072
12073   /* remove the last programmed player action */
12074   player->programmed_action = 0;
12075
12076   if (player->MovPos)
12077   {
12078     /* should only happen if pre-1.2 tape recordings are played */
12079     /* this is only for backward compatibility */
12080
12081     int original_move_delay_value = player->move_delay_value;
12082
12083 #if DEBUG
12084     printf("THIS SHOULD ONLY HAPPEN WITH PRE-1.2 LEVEL TAPES. [%d]\n",
12085            tape.counter);
12086 #endif
12087
12088     /* scroll remaining steps with finest movement resolution */
12089     player->move_delay_value = MOVE_DELAY_NORMAL_SPEED;
12090
12091     while (player->MovPos)
12092     {
12093       ScrollPlayer(player, SCROLL_GO_ON);
12094       ScrollScreen(NULL, SCROLL_GO_ON);
12095
12096       AdvanceFrameAndPlayerCounters(player->index_nr);
12097
12098       DrawAllPlayers();
12099       BackToFront_WithFrameDelay(0);
12100     }
12101
12102     player->move_delay_value = original_move_delay_value;
12103   }
12104
12105   player->is_active = FALSE;
12106
12107   if (player->last_move_dir & MV_HORIZONTAL)
12108   {
12109     if (!(moved |= MovePlayerOneStep(player, 0, dy, dx, dy)))
12110       moved |= MovePlayerOneStep(player, dx, 0, dx, dy);
12111   }
12112   else
12113   {
12114     if (!(moved |= MovePlayerOneStep(player, dx, 0, dx, dy)))
12115       moved |= MovePlayerOneStep(player, 0, dy, dx, dy);
12116   }
12117
12118   if (!moved && !player->is_active)
12119   {
12120     player->is_moving = FALSE;
12121     player->is_digging = FALSE;
12122     player->is_collecting = FALSE;
12123     player->is_snapping = FALSE;
12124     player->is_pushing = FALSE;
12125   }
12126
12127   jx = player->jx;
12128   jy = player->jy;
12129
12130   if (moved & MP_MOVING && !ScreenMovPos &&
12131       (player->index_nr == game.centered_player_nr ||
12132        game.centered_player_nr == -1))
12133   {
12134     int old_scroll_x = scroll_x, old_scroll_y = scroll_y;
12135     int offset = game.scroll_delay_value;
12136
12137     if (!IN_VIS_FIELD(SCREENX(jx), SCREENY(jy)))
12138     {
12139       /* actual player has left the screen -- scroll in that direction */
12140       if (jx != old_jx)         /* player has moved horizontally */
12141         scroll_x += (jx - old_jx);
12142       else                      /* player has moved vertically */
12143         scroll_y += (jy - old_jy);
12144     }
12145     else
12146     {
12147       if (jx != old_jx)         /* player has moved horizontally */
12148       {
12149         if ((player->MovDir == MV_LEFT  && scroll_x > jx - MIDPOSX + offset) ||
12150             (player->MovDir == MV_RIGHT && scroll_x < jx - MIDPOSX - offset))
12151           scroll_x = jx-MIDPOSX + (scroll_x < jx-MIDPOSX ? -offset : +offset);
12152
12153         /* don't scroll over playfield boundaries */
12154         if (scroll_x < SBX_Left || scroll_x > SBX_Right)
12155           scroll_x = (scroll_x < SBX_Left ? SBX_Left : SBX_Right);
12156
12157         /* don't scroll more than one field at a time */
12158         scroll_x = old_scroll_x + SIGN(scroll_x - old_scroll_x);
12159
12160         /* don't scroll against the player's moving direction */
12161         if ((player->MovDir == MV_LEFT  && scroll_x > old_scroll_x) ||
12162             (player->MovDir == MV_RIGHT && scroll_x < old_scroll_x))
12163           scroll_x = old_scroll_x;
12164       }
12165       else                      /* player has moved vertically */
12166       {
12167         if ((player->MovDir == MV_UP   && scroll_y > jy - MIDPOSY + offset) ||
12168             (player->MovDir == MV_DOWN && scroll_y < jy - MIDPOSY - offset))
12169           scroll_y = jy-MIDPOSY + (scroll_y < jy-MIDPOSY ? -offset : +offset);
12170
12171         /* don't scroll over playfield boundaries */
12172         if (scroll_y < SBY_Upper || scroll_y > SBY_Lower)
12173           scroll_y = (scroll_y < SBY_Upper ? SBY_Upper : SBY_Lower);
12174
12175         /* don't scroll more than one field at a time */
12176         scroll_y = old_scroll_y + SIGN(scroll_y - old_scroll_y);
12177
12178         /* don't scroll against the player's moving direction */
12179         if ((player->MovDir == MV_UP   && scroll_y > old_scroll_y) ||
12180             (player->MovDir == MV_DOWN && scroll_y < old_scroll_y))
12181           scroll_y = old_scroll_y;
12182       }
12183     }
12184
12185     if (scroll_x != old_scroll_x || scroll_y != old_scroll_y)
12186     {
12187       if (!options.network && game.centered_player_nr == -1 &&
12188           !AllPlayersInVisibleScreen())
12189       {
12190         scroll_x = old_scroll_x;
12191         scroll_y = old_scroll_y;
12192       }
12193       else
12194       {
12195         ScrollScreen(player, SCROLL_INIT);
12196         ScrollLevel(old_scroll_x - scroll_x, old_scroll_y - scroll_y);
12197       }
12198     }
12199   }
12200
12201   player->StepFrame = 0;
12202
12203   if (moved & MP_MOVING)
12204   {
12205     if (old_jx != jx && old_jy == jy)
12206       player->MovDir = (old_jx < jx ? MV_RIGHT : MV_LEFT);
12207     else if (old_jx == jx && old_jy != jy)
12208       player->MovDir = (old_jy < jy ? MV_DOWN : MV_UP);
12209
12210     TEST_DrawLevelField(jx, jy);        /* for "crumbled sand" */
12211
12212     player->last_move_dir = player->MovDir;
12213     player->is_moving = TRUE;
12214     player->is_snapping = FALSE;
12215     player->is_switching = FALSE;
12216     player->is_dropping = FALSE;
12217     player->is_dropping_pressed = FALSE;
12218     player->drop_pressed_delay = 0;
12219
12220 #if 0
12221     /* should better be called here than above, but this breaks some tapes */
12222     ScrollPlayer(player, SCROLL_INIT);
12223 #endif
12224   }
12225   else
12226   {
12227     CheckGravityMovementWhenNotMoving(player);
12228
12229     player->is_moving = FALSE;
12230
12231     /* at this point, the player is allowed to move, but cannot move right now
12232        (e.g. because of something blocking the way) -- ensure that the player
12233        is also allowed to move in the next frame (in old versions before 3.1.1,
12234        the player was forced to wait again for eight frames before next try) */
12235
12236     if (game.engine_version >= VERSION_IDENT(3,1,1,0))
12237       player->move_delay = 0;   /* allow direct movement in the next frame */
12238   }
12239
12240   if (player->move_delay == -1)         /* not yet initialized by DigField() */
12241     player->move_delay = player->move_delay_value;
12242
12243   if (game.engine_version < VERSION_IDENT(3,0,7,0))
12244   {
12245     TestIfPlayerTouchesBadThing(jx, jy);
12246     TestIfPlayerTouchesCustomElement(jx, jy);
12247   }
12248
12249   if (!player->active)
12250     RemovePlayer(player);
12251
12252   return moved;
12253 }
12254
12255 void ScrollPlayer(struct PlayerInfo *player, int mode)
12256 {
12257   int jx = player->jx, jy = player->jy;
12258   int last_jx = player->last_jx, last_jy = player->last_jy;
12259   int move_stepsize = TILEX / player->move_delay_value;
12260
12261   if (!player->active)
12262     return;
12263
12264   if (player->MovPos == 0 && mode == SCROLL_GO_ON)      /* player not moving */
12265     return;
12266
12267   if (mode == SCROLL_INIT)
12268   {
12269     player->actual_frame_counter = FrameCounter;
12270     player->GfxPos = move_stepsize * (player->MovPos / move_stepsize);
12271
12272     if ((player->block_last_field || player->block_delay_adjustment > 0) &&
12273         Feld[last_jx][last_jy] == EL_EMPTY)
12274     {
12275       int last_field_block_delay = 0;   /* start with no blocking at all */
12276       int block_delay_adjustment = player->block_delay_adjustment;
12277
12278       /* if player blocks last field, add delay for exactly one move */
12279       if (player->block_last_field)
12280       {
12281         last_field_block_delay += player->move_delay_value;
12282
12283         /* when blocking enabled, prevent moving up despite gravity */
12284         if (player->gravity && player->MovDir == MV_UP)
12285           block_delay_adjustment = -1;
12286       }
12287
12288       /* add block delay adjustment (also possible when not blocking) */
12289       last_field_block_delay += block_delay_adjustment;
12290
12291       Feld[last_jx][last_jy] = EL_PLAYER_IS_LEAVING;
12292       MovDelay[last_jx][last_jy] = last_field_block_delay + 1;
12293     }
12294
12295     if (player->MovPos != 0)    /* player has not yet reached destination */
12296       return;
12297   }
12298   else if (!FrameReached(&player->actual_frame_counter, 1))
12299     return;
12300
12301   if (player->MovPos != 0)
12302   {
12303     player->MovPos += (player->MovPos > 0 ? -1 : 1) * move_stepsize;
12304     player->GfxPos = move_stepsize * (player->MovPos / move_stepsize);
12305
12306     /* before DrawPlayer() to draw correct player graphic for this case */
12307     if (player->MovPos == 0)
12308       CheckGravityMovement(player);
12309   }
12310
12311   if (player->MovPos == 0)      /* player reached destination field */
12312   {
12313     if (player->move_delay_reset_counter > 0)
12314     {
12315       player->move_delay_reset_counter--;
12316
12317       if (player->move_delay_reset_counter == 0)
12318       {
12319         /* continue with normal speed after quickly moving through gate */
12320         HALVE_PLAYER_SPEED(player);
12321
12322         /* be able to make the next move without delay */
12323         player->move_delay = 0;
12324       }
12325     }
12326
12327     player->last_jx = jx;
12328     player->last_jy = jy;
12329
12330     if (Feld[jx][jy] == EL_EXIT_OPEN ||
12331         Feld[jx][jy] == EL_EM_EXIT_OPEN ||
12332         Feld[jx][jy] == EL_EM_EXIT_OPENING ||
12333         Feld[jx][jy] == EL_STEEL_EXIT_OPEN ||
12334         Feld[jx][jy] == EL_EM_STEEL_EXIT_OPEN ||
12335         Feld[jx][jy] == EL_EM_STEEL_EXIT_OPENING ||
12336         Feld[jx][jy] == EL_SP_EXIT_OPEN ||
12337         Feld[jx][jy] == EL_SP_EXIT_OPENING)     /* <-- special case */
12338     {
12339       DrawPlayer(player);       /* needed here only to cleanup last field */
12340       RemovePlayer(player);
12341
12342       if (local_player->friends_still_needed == 0 ||
12343           IS_SP_ELEMENT(Feld[jx][jy]))
12344         PlayerWins(player);
12345     }
12346
12347     /* this breaks one level: "machine", level 000 */
12348     {
12349       int move_direction = player->MovDir;
12350       int enter_side = MV_DIR_OPPOSITE(move_direction);
12351       int leave_side = move_direction;
12352       int old_jx = last_jx;
12353       int old_jy = last_jy;
12354       int old_element = Feld[old_jx][old_jy];
12355       int new_element = Feld[jx][jy];
12356
12357       if (IS_CUSTOM_ELEMENT(old_element))
12358         CheckElementChangeByPlayer(old_jx, old_jy, old_element,
12359                                    CE_LEFT_BY_PLAYER,
12360                                    player->index_bit, leave_side);
12361
12362       CheckTriggeredElementChangeByPlayer(old_jx, old_jy, old_element,
12363                                           CE_PLAYER_LEAVES_X,
12364                                           player->index_bit, leave_side);
12365
12366       if (IS_CUSTOM_ELEMENT(new_element))
12367         CheckElementChangeByPlayer(jx, jy, new_element, CE_ENTERED_BY_PLAYER,
12368                                    player->index_bit, enter_side);
12369
12370       CheckTriggeredElementChangeByPlayer(jx, jy, new_element,
12371                                           CE_PLAYER_ENTERS_X,
12372                                           player->index_bit, enter_side);
12373
12374       CheckTriggeredElementChangeBySide(jx, jy, player->initial_element,
12375                                         CE_MOVE_OF_X, move_direction);
12376     }
12377
12378     if (game.engine_version >= VERSION_IDENT(3,0,7,0))
12379     {
12380       TestIfPlayerTouchesBadThing(jx, jy);
12381       TestIfPlayerTouchesCustomElement(jx, jy);
12382
12383       /* needed because pushed element has not yet reached its destination,
12384          so it would trigger a change event at its previous field location */
12385       if (!player->is_pushing)
12386         TestIfElementTouchesCustomElement(jx, jy);      /* for empty space */
12387
12388       if (!player->active)
12389         RemovePlayer(player);
12390     }
12391
12392     if (!local_player->LevelSolved && level.use_step_counter)
12393     {
12394       int i;
12395
12396       TimePlayed++;
12397
12398       if (TimeLeft > 0)
12399       {
12400         TimeLeft--;
12401
12402         if (TimeLeft <= 10 && setup.time_limit)
12403           PlaySound(SND_GAME_RUNNING_OUT_OF_TIME);
12404
12405         game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
12406
12407         DisplayGameControlValues();
12408
12409         if (!TimeLeft && setup.time_limit)
12410           for (i = 0; i < MAX_PLAYERS; i++)
12411             KillPlayer(&stored_player[i]);
12412       }
12413       else if (game.no_time_limit && !AllPlayersGone) /* level w/o time limit */
12414       {
12415         game_panel_controls[GAME_PANEL_TIME].value = TimePlayed;
12416
12417         DisplayGameControlValues();
12418       }
12419     }
12420
12421     if (tape.single_step && tape.recording && !tape.pausing &&
12422         !player->programmed_action)
12423       TapeTogglePause(TAPE_TOGGLE_AUTOMATIC);
12424
12425     if (!player->programmed_action)
12426       CheckSaveEngineSnapshot(player);
12427   }
12428 }
12429
12430 void ScrollScreen(struct PlayerInfo *player, int mode)
12431 {
12432   static unsigned int screen_frame_counter = 0;
12433
12434   if (mode == SCROLL_INIT)
12435   {
12436     /* set scrolling step size according to actual player's moving speed */
12437     ScrollStepSize = TILEX / player->move_delay_value;
12438
12439     screen_frame_counter = FrameCounter;
12440     ScreenMovDir = player->MovDir;
12441     ScreenMovPos = player->MovPos;
12442     ScreenGfxPos = ScrollStepSize * (ScreenMovPos / ScrollStepSize);
12443     return;
12444   }
12445   else if (!FrameReached(&screen_frame_counter, 1))
12446     return;
12447
12448   if (ScreenMovPos)
12449   {
12450     ScreenMovPos += (ScreenMovPos > 0 ? -1 : 1) * ScrollStepSize;
12451     ScreenGfxPos = ScrollStepSize * (ScreenMovPos / ScrollStepSize);
12452     redraw_mask |= REDRAW_FIELD;
12453   }
12454   else
12455     ScreenMovDir = MV_NONE;
12456 }
12457
12458 void TestIfPlayerTouchesCustomElement(int x, int y)
12459 {
12460   static int xy[4][2] =
12461   {
12462     { 0, -1 },
12463     { -1, 0 },
12464     { +1, 0 },
12465     { 0, +1 }
12466   };
12467   static int trigger_sides[4][2] =
12468   {
12469     /* center side       border side */
12470     { CH_SIDE_TOP,      CH_SIDE_BOTTOM  },      /* check top    */
12471     { CH_SIDE_LEFT,     CH_SIDE_RIGHT   },      /* check left   */
12472     { CH_SIDE_RIGHT,    CH_SIDE_LEFT    },      /* check right  */
12473     { CH_SIDE_BOTTOM,   CH_SIDE_TOP     }       /* check bottom */
12474   };
12475   static int touch_dir[4] =
12476   {
12477     MV_LEFT | MV_RIGHT,
12478     MV_UP   | MV_DOWN,
12479     MV_UP   | MV_DOWN,
12480     MV_LEFT | MV_RIGHT
12481   };
12482   int center_element = Feld[x][y];      /* should always be non-moving! */
12483   int i;
12484
12485   for (i = 0; i < NUM_DIRECTIONS; i++)
12486   {
12487     int xx = x + xy[i][0];
12488     int yy = y + xy[i][1];
12489     int center_side = trigger_sides[i][0];
12490     int border_side = trigger_sides[i][1];
12491     int border_element;
12492
12493     if (!IN_LEV_FIELD(xx, yy))
12494       continue;
12495
12496     if (IS_PLAYER(x, y))                /* player found at center element */
12497     {
12498       struct PlayerInfo *player = PLAYERINFO(x, y);
12499
12500       if (game.engine_version < VERSION_IDENT(3,0,7,0))
12501         border_element = Feld[xx][yy];          /* may be moving! */
12502       else if (!IS_MOVING(xx, yy) && !IS_BLOCKED(xx, yy))
12503         border_element = Feld[xx][yy];
12504       else if (MovDir[xx][yy] & touch_dir[i])   /* elements are touching */
12505         border_element = MovingOrBlocked2Element(xx, yy);
12506       else
12507         continue;               /* center and border element do not touch */
12508
12509       CheckElementChangeByPlayer(xx, yy, border_element, CE_TOUCHED_BY_PLAYER,
12510                                  player->index_bit, border_side);
12511       CheckTriggeredElementChangeByPlayer(xx, yy, border_element,
12512                                           CE_PLAYER_TOUCHES_X,
12513                                           player->index_bit, border_side);
12514
12515       {
12516         /* use player element that is initially defined in the level playfield,
12517            not the player element that corresponds to the runtime player number
12518            (example: a level that contains EL_PLAYER_3 as the only player would
12519            incorrectly give EL_PLAYER_1 for "player->element_nr") */
12520         int player_element = PLAYERINFO(x, y)->initial_element;
12521
12522         CheckElementChangeBySide(xx, yy, border_element, player_element,
12523                                  CE_TOUCHING_X, border_side);
12524       }
12525     }
12526     else if (IS_PLAYER(xx, yy))         /* player found at border element */
12527     {
12528       struct PlayerInfo *player = PLAYERINFO(xx, yy);
12529
12530       if (game.engine_version >= VERSION_IDENT(3,0,7,0))
12531       {
12532         if (player->MovPos != 0 && !(player->MovDir & touch_dir[i]))
12533           continue;             /* center and border element do not touch */
12534       }
12535
12536       CheckElementChangeByPlayer(x, y, center_element, CE_TOUCHED_BY_PLAYER,
12537                                  player->index_bit, center_side);
12538       CheckTriggeredElementChangeByPlayer(x, y, center_element,
12539                                           CE_PLAYER_TOUCHES_X,
12540                                           player->index_bit, center_side);
12541
12542       {
12543         /* use player element that is initially defined in the level playfield,
12544            not the player element that corresponds to the runtime player number
12545            (example: a level that contains EL_PLAYER_3 as the only player would
12546            incorrectly give EL_PLAYER_1 for "player->element_nr") */
12547         int player_element = PLAYERINFO(xx, yy)->initial_element;
12548
12549         CheckElementChangeBySide(x, y, center_element, player_element,
12550                                  CE_TOUCHING_X, center_side);
12551       }
12552
12553       break;
12554     }
12555   }
12556 }
12557
12558 void TestIfElementTouchesCustomElement(int x, int y)
12559 {
12560   static int xy[4][2] =
12561   {
12562     { 0, -1 },
12563     { -1, 0 },
12564     { +1, 0 },
12565     { 0, +1 }
12566   };
12567   static int trigger_sides[4][2] =
12568   {
12569     /* center side      border side */
12570     { CH_SIDE_TOP,      CH_SIDE_BOTTOM  },      /* check top    */
12571     { CH_SIDE_LEFT,     CH_SIDE_RIGHT   },      /* check left   */
12572     { CH_SIDE_RIGHT,    CH_SIDE_LEFT    },      /* check right  */
12573     { CH_SIDE_BOTTOM,   CH_SIDE_TOP     }       /* check bottom */
12574   };
12575   static int touch_dir[4] =
12576   {
12577     MV_LEFT | MV_RIGHT,
12578     MV_UP   | MV_DOWN,
12579     MV_UP   | MV_DOWN,
12580     MV_LEFT | MV_RIGHT
12581   };
12582   boolean change_center_element = FALSE;
12583   int center_element = Feld[x][y];      /* should always be non-moving! */
12584   int border_element_old[NUM_DIRECTIONS];
12585   int i;
12586
12587   for (i = 0; i < NUM_DIRECTIONS; i++)
12588   {
12589     int xx = x + xy[i][0];
12590     int yy = y + xy[i][1];
12591     int border_element;
12592
12593     border_element_old[i] = -1;
12594
12595     if (!IN_LEV_FIELD(xx, yy))
12596       continue;
12597
12598     if (game.engine_version < VERSION_IDENT(3,0,7,0))
12599       border_element = Feld[xx][yy];    /* may be moving! */
12600     else if (!IS_MOVING(xx, yy) && !IS_BLOCKED(xx, yy))
12601       border_element = Feld[xx][yy];
12602     else if (MovDir[xx][yy] & touch_dir[i])     /* elements are touching */
12603       border_element = MovingOrBlocked2Element(xx, yy);
12604     else
12605       continue;                 /* center and border element do not touch */
12606
12607     border_element_old[i] = border_element;
12608   }
12609
12610   for (i = 0; i < NUM_DIRECTIONS; i++)
12611   {
12612     int xx = x + xy[i][0];
12613     int yy = y + xy[i][1];
12614     int center_side = trigger_sides[i][0];
12615     int border_element = border_element_old[i];
12616
12617     if (border_element == -1)
12618       continue;
12619
12620     /* check for change of border element */
12621     CheckElementChangeBySide(xx, yy, border_element, center_element,
12622                              CE_TOUCHING_X, center_side);
12623
12624     /* (center element cannot be player, so we dont have to check this here) */
12625   }
12626
12627   for (i = 0; i < NUM_DIRECTIONS; i++)
12628   {
12629     int xx = x + xy[i][0];
12630     int yy = y + xy[i][1];
12631     int border_side = trigger_sides[i][1];
12632     int border_element = border_element_old[i];
12633
12634     if (border_element == -1)
12635       continue;
12636
12637     /* check for change of center element (but change it only once) */
12638     if (!change_center_element)
12639       change_center_element =
12640         CheckElementChangeBySide(x, y, center_element, border_element,
12641                                  CE_TOUCHING_X, border_side);
12642
12643     if (IS_PLAYER(xx, yy))
12644     {
12645       /* use player element that is initially defined in the level playfield,
12646          not the player element that corresponds to the runtime player number
12647          (example: a level that contains EL_PLAYER_3 as the only player would
12648          incorrectly give EL_PLAYER_1 for "player->element_nr") */
12649       int player_element = PLAYERINFO(xx, yy)->initial_element;
12650
12651       CheckElementChangeBySide(x, y, center_element, player_element,
12652                                CE_TOUCHING_X, border_side);
12653     }
12654   }
12655 }
12656
12657 void TestIfElementHitsCustomElement(int x, int y, int direction)
12658 {
12659   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
12660   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
12661   int hitx = x + dx, hity = y + dy;
12662   int hitting_element = Feld[x][y];
12663   int touched_element;
12664
12665   if (IN_LEV_FIELD(hitx, hity) && IS_FREE(hitx, hity))
12666     return;
12667
12668   touched_element = (IN_LEV_FIELD(hitx, hity) ?
12669                      MovingOrBlocked2Element(hitx, hity) : EL_STEELWALL);
12670
12671   if (IN_LEV_FIELD(hitx, hity))
12672   {
12673     int opposite_direction = MV_DIR_OPPOSITE(direction);
12674     int hitting_side = direction;
12675     int touched_side = opposite_direction;
12676     boolean object_hit = (!IS_MOVING(hitx, hity) ||
12677                           MovDir[hitx][hity] != direction ||
12678                           ABS(MovPos[hitx][hity]) <= TILEY / 2);
12679
12680     object_hit = TRUE;
12681
12682     if (object_hit)
12683     {
12684       CheckElementChangeBySide(x, y, hitting_element, touched_element,
12685                                CE_HITTING_X, touched_side);
12686
12687       CheckElementChangeBySide(hitx, hity, touched_element, hitting_element,
12688                                CE_HIT_BY_X, hitting_side);
12689
12690       CheckElementChangeBySide(hitx, hity, touched_element, hitting_element,
12691                                CE_HIT_BY_SOMETHING, opposite_direction);
12692
12693       if (IS_PLAYER(hitx, hity))
12694       {
12695         /* use player element that is initially defined in the level playfield,
12696            not the player element that corresponds to the runtime player number
12697            (example: a level that contains EL_PLAYER_3 as the only player would
12698            incorrectly give EL_PLAYER_1 for "player->element_nr") */
12699         int player_element = PLAYERINFO(hitx, hity)->initial_element;
12700
12701         CheckElementChangeBySide(x, y, hitting_element, player_element,
12702                                  CE_HITTING_X, touched_side);
12703       }
12704     }
12705   }
12706
12707   /* "hitting something" is also true when hitting the playfield border */
12708   CheckElementChangeBySide(x, y, hitting_element, touched_element,
12709                            CE_HITTING_SOMETHING, direction);
12710 }
12711
12712 void TestIfGoodThingHitsBadThing(int good_x, int good_y, int good_move_dir)
12713 {
12714   int i, kill_x = -1, kill_y = -1;
12715
12716   int bad_element = -1;
12717   static int test_xy[4][2] =
12718   {
12719     { 0, -1 },
12720     { -1, 0 },
12721     { +1, 0 },
12722     { 0, +1 }
12723   };
12724   static int test_dir[4] =
12725   {
12726     MV_UP,
12727     MV_LEFT,
12728     MV_RIGHT,
12729     MV_DOWN
12730   };
12731
12732   for (i = 0; i < NUM_DIRECTIONS; i++)
12733   {
12734     int test_x, test_y, test_move_dir, test_element;
12735
12736     test_x = good_x + test_xy[i][0];
12737     test_y = good_y + test_xy[i][1];
12738
12739     if (!IN_LEV_FIELD(test_x, test_y))
12740       continue;
12741
12742     test_move_dir =
12743       (IS_MOVING(test_x, test_y) ? MovDir[test_x][test_y] : MV_NONE);
12744
12745     test_element = MovingOrBlocked2ElementIfNotLeaving(test_x, test_y);
12746
12747     /* 1st case: good thing is moving towards DONT_RUN_INTO style bad thing;
12748        2nd case: DONT_TOUCH style bad thing does not move away from good thing
12749     */
12750     if ((DONT_RUN_INTO(test_element) && good_move_dir == test_dir[i]) ||
12751         (DONT_TOUCH(test_element)    && test_move_dir != test_dir[i]))
12752     {
12753       kill_x = test_x;
12754       kill_y = test_y;
12755       bad_element = test_element;
12756
12757       break;
12758     }
12759   }
12760
12761   if (kill_x != -1 || kill_y != -1)
12762   {
12763     if (IS_PLAYER(good_x, good_y))
12764     {
12765       struct PlayerInfo *player = PLAYERINFO(good_x, good_y);
12766
12767       if (player->shield_deadly_time_left > 0 &&
12768           !IS_INDESTRUCTIBLE(bad_element))
12769         Bang(kill_x, kill_y);
12770       else if (!PLAYER_ENEMY_PROTECTED(good_x, good_y))
12771         KillPlayer(player);
12772     }
12773     else
12774       Bang(good_x, good_y);
12775   }
12776 }
12777
12778 void TestIfBadThingHitsGoodThing(int bad_x, int bad_y, int bad_move_dir)
12779 {
12780   int i, kill_x = -1, kill_y = -1;
12781   int bad_element = Feld[bad_x][bad_y];
12782   static int test_xy[4][2] =
12783   {
12784     { 0, -1 },
12785     { -1, 0 },
12786     { +1, 0 },
12787     { 0, +1 }
12788   };
12789   static int touch_dir[4] =
12790   {
12791     MV_LEFT | MV_RIGHT,
12792     MV_UP   | MV_DOWN,
12793     MV_UP   | MV_DOWN,
12794     MV_LEFT | MV_RIGHT
12795   };
12796   static int test_dir[4] =
12797   {
12798     MV_UP,
12799     MV_LEFT,
12800     MV_RIGHT,
12801     MV_DOWN
12802   };
12803
12804   if (bad_element == EL_EXPLOSION)      /* skip just exploding bad things */
12805     return;
12806
12807   for (i = 0; i < NUM_DIRECTIONS; i++)
12808   {
12809     int test_x, test_y, test_move_dir, test_element;
12810
12811     test_x = bad_x + test_xy[i][0];
12812     test_y = bad_y + test_xy[i][1];
12813
12814     if (!IN_LEV_FIELD(test_x, test_y))
12815       continue;
12816
12817     test_move_dir =
12818       (IS_MOVING(test_x, test_y) ? MovDir[test_x][test_y] : MV_NONE);
12819
12820     test_element = Feld[test_x][test_y];
12821
12822     /* 1st case: good thing is moving towards DONT_RUN_INTO style bad thing;
12823        2nd case: DONT_TOUCH style bad thing does not move away from good thing
12824     */
12825     if ((DONT_RUN_INTO(bad_element) &&  bad_move_dir == test_dir[i]) ||
12826         (DONT_TOUCH(bad_element)    && test_move_dir != test_dir[i]))
12827     {
12828       /* good thing is player or penguin that does not move away */
12829       if (IS_PLAYER(test_x, test_y))
12830       {
12831         struct PlayerInfo *player = PLAYERINFO(test_x, test_y);
12832
12833         if (bad_element == EL_ROBOT && player->is_moving)
12834           continue;     /* robot does not kill player if he is moving */
12835
12836         if (game.engine_version >= VERSION_IDENT(3,0,7,0))
12837         {
12838           if (player->MovPos != 0 && !(player->MovDir & touch_dir[i]))
12839             continue;           /* center and border element do not touch */
12840         }
12841
12842         kill_x = test_x;
12843         kill_y = test_y;
12844
12845         break;
12846       }
12847       else if (test_element == EL_PENGUIN)
12848       {
12849         kill_x = test_x;
12850         kill_y = test_y;
12851
12852         break;
12853       }
12854     }
12855   }
12856
12857   if (kill_x != -1 || kill_y != -1)
12858   {
12859     if (IS_PLAYER(kill_x, kill_y))
12860     {
12861       struct PlayerInfo *player = PLAYERINFO(kill_x, kill_y);
12862
12863       if (player->shield_deadly_time_left > 0 &&
12864           !IS_INDESTRUCTIBLE(bad_element))
12865         Bang(bad_x, bad_y);
12866       else if (!PLAYER_ENEMY_PROTECTED(kill_x, kill_y))
12867         KillPlayer(player);
12868     }
12869     else
12870       Bang(kill_x, kill_y);
12871   }
12872 }
12873
12874 void TestIfGoodThingGetsHitByBadThing(int bad_x, int bad_y, int bad_move_dir)
12875 {
12876   int bad_element = Feld[bad_x][bad_y];
12877   int dx = (bad_move_dir == MV_LEFT ? -1 : bad_move_dir == MV_RIGHT ? +1 : 0);
12878   int dy = (bad_move_dir == MV_UP   ? -1 : bad_move_dir == MV_DOWN  ? +1 : 0);
12879   int test_x = bad_x + dx, test_y = bad_y + dy;
12880   int test_move_dir, test_element;
12881   int kill_x = -1, kill_y = -1;
12882
12883   if (!IN_LEV_FIELD(test_x, test_y))
12884     return;
12885
12886   test_move_dir =
12887     (IS_MOVING(test_x, test_y) ? MovDir[test_x][test_y] : MV_NONE);
12888
12889   test_element = Feld[test_x][test_y];
12890
12891   if (test_move_dir != bad_move_dir)
12892   {
12893     /* good thing can be player or penguin that does not move away */
12894     if (IS_PLAYER(test_x, test_y))
12895     {
12896       struct PlayerInfo *player = PLAYERINFO(test_x, test_y);
12897
12898       /* (note: in comparison to DONT_RUN_TO and DONT_TOUCH, also handle the
12899          player as being hit when he is moving towards the bad thing, because
12900          the "get hit by" condition would be lost after the player stops) */
12901       if (player->MovPos != 0 && player->MovDir == bad_move_dir)
12902         return;         /* player moves away from bad thing */
12903
12904       kill_x = test_x;
12905       kill_y = test_y;
12906     }
12907     else if (test_element == EL_PENGUIN)
12908     {
12909       kill_x = test_x;
12910       kill_y = test_y;
12911     }
12912   }
12913
12914   if (kill_x != -1 || kill_y != -1)
12915   {
12916     if (IS_PLAYER(kill_x, kill_y))
12917     {
12918       struct PlayerInfo *player = PLAYERINFO(kill_x, kill_y);
12919
12920       if (player->shield_deadly_time_left > 0 &&
12921           !IS_INDESTRUCTIBLE(bad_element))
12922         Bang(bad_x, bad_y);
12923       else if (!PLAYER_ENEMY_PROTECTED(kill_x, kill_y))
12924         KillPlayer(player);
12925     }
12926     else
12927       Bang(kill_x, kill_y);
12928   }
12929 }
12930
12931 void TestIfPlayerTouchesBadThing(int x, int y)
12932 {
12933   TestIfGoodThingHitsBadThing(x, y, MV_NONE);
12934 }
12935
12936 void TestIfPlayerRunsIntoBadThing(int x, int y, int move_dir)
12937 {
12938   TestIfGoodThingHitsBadThing(x, y, move_dir);
12939 }
12940
12941 void TestIfBadThingTouchesPlayer(int x, int y)
12942 {
12943   TestIfBadThingHitsGoodThing(x, y, MV_NONE);
12944 }
12945
12946 void TestIfBadThingRunsIntoPlayer(int x, int y, int move_dir)
12947 {
12948   TestIfBadThingHitsGoodThing(x, y, move_dir);
12949 }
12950
12951 void TestIfFriendTouchesBadThing(int x, int y)
12952 {
12953   TestIfGoodThingHitsBadThing(x, y, MV_NONE);
12954 }
12955
12956 void TestIfBadThingTouchesFriend(int x, int y)
12957 {
12958   TestIfBadThingHitsGoodThing(x, y, MV_NONE);
12959 }
12960
12961 void TestIfBadThingTouchesOtherBadThing(int bad_x, int bad_y)
12962 {
12963   int i, kill_x = bad_x, kill_y = bad_y;
12964   static int xy[4][2] =
12965   {
12966     { 0, -1 },
12967     { -1, 0 },
12968     { +1, 0 },
12969     { 0, +1 }
12970   };
12971
12972   for (i = 0; i < NUM_DIRECTIONS; i++)
12973   {
12974     int x, y, element;
12975
12976     x = bad_x + xy[i][0];
12977     y = bad_y + xy[i][1];
12978     if (!IN_LEV_FIELD(x, y))
12979       continue;
12980
12981     element = Feld[x][y];
12982     if (IS_AMOEBOID(element) || element == EL_GAME_OF_LIFE ||
12983         element == EL_AMOEBA_GROWING || element == EL_AMOEBA_DROP)
12984     {
12985       kill_x = x;
12986       kill_y = y;
12987       break;
12988     }
12989   }
12990
12991   if (kill_x != bad_x || kill_y != bad_y)
12992     Bang(bad_x, bad_y);
12993 }
12994
12995 void KillPlayer(struct PlayerInfo *player)
12996 {
12997   int jx = player->jx, jy = player->jy;
12998
12999   if (!player->active)
13000     return;
13001
13002 #if 0
13003   printf("::: 0: killed == %d, active == %d, reanimated == %d\n",
13004          player->killed, player->active, player->reanimated);
13005 #endif
13006
13007   /* the following code was introduced to prevent an infinite loop when calling
13008      -> Bang()
13009      -> CheckTriggeredElementChangeExt()
13010      -> ExecuteCustomElementAction()
13011      -> KillPlayer()
13012      -> (infinitely repeating the above sequence of function calls)
13013      which occurs when killing the player while having a CE with the setting
13014      "kill player X when explosion of <player X>"; the solution using a new
13015      field "player->killed" was chosen for backwards compatibility, although
13016      clever use of the fields "player->active" etc. would probably also work */
13017 #if 1
13018   if (player->killed)
13019     return;
13020 #endif
13021
13022   player->killed = TRUE;
13023
13024   /* remove accessible field at the player's position */
13025   Feld[jx][jy] = EL_EMPTY;
13026
13027   /* deactivate shield (else Bang()/Explode() would not work right) */
13028   player->shield_normal_time_left = 0;
13029   player->shield_deadly_time_left = 0;
13030
13031 #if 0
13032   printf("::: 1: killed == %d, active == %d, reanimated == %d\n",
13033          player->killed, player->active, player->reanimated);
13034 #endif
13035
13036   Bang(jx, jy);
13037
13038 #if 0
13039   printf("::: 2: killed == %d, active == %d, reanimated == %d\n",
13040          player->killed, player->active, player->reanimated);
13041 #endif
13042
13043   if (player->reanimated)       /* killed player may have been reanimated */
13044     player->killed = player->reanimated = FALSE;
13045   else
13046     BuryPlayer(player);
13047 }
13048
13049 static void KillPlayerUnlessEnemyProtected(int x, int y)
13050 {
13051   if (!PLAYER_ENEMY_PROTECTED(x, y))
13052     KillPlayer(PLAYERINFO(x, y));
13053 }
13054
13055 static void KillPlayerUnlessExplosionProtected(int x, int y)
13056 {
13057   if (!PLAYER_EXPLOSION_PROTECTED(x, y))
13058     KillPlayer(PLAYERINFO(x, y));
13059 }
13060
13061 void BuryPlayer(struct PlayerInfo *player)
13062 {
13063   int jx = player->jx, jy = player->jy;
13064
13065   if (!player->active)
13066     return;
13067
13068   PlayLevelSoundElementAction(jx, jy, player->artwork_element, ACTION_DYING);
13069   PlayLevelSound(jx, jy, SND_GAME_LOSING);
13070
13071   player->GameOver = TRUE;
13072   RemovePlayer(player);
13073 }
13074
13075 void RemovePlayer(struct PlayerInfo *player)
13076 {
13077   int jx = player->jx, jy = player->jy;
13078   int i, found = FALSE;
13079
13080   player->present = FALSE;
13081   player->active = FALSE;
13082
13083   if (!ExplodeField[jx][jy])
13084     StorePlayer[jx][jy] = 0;
13085
13086   if (player->is_moving)
13087     TEST_DrawLevelField(player->last_jx, player->last_jy);
13088
13089   for (i = 0; i < MAX_PLAYERS; i++)
13090     if (stored_player[i].active)
13091       found = TRUE;
13092
13093   if (!found)
13094     AllPlayersGone = TRUE;
13095
13096   ExitX = ZX = jx;
13097   ExitY = ZY = jy;
13098 }
13099
13100 static void setFieldForSnapping(int x, int y, int element, int direction)
13101 {
13102   struct ElementInfo *ei = &element_info[element];
13103   int direction_bit = MV_DIR_TO_BIT(direction);
13104   int graphic_snapping = ei->direction_graphic[ACTION_SNAPPING][direction_bit];
13105   int action = (graphic_snapping != IMG_EMPTY_SPACE ? ACTION_SNAPPING :
13106                 IS_DIGGABLE(element) ? ACTION_DIGGING : ACTION_COLLECTING);
13107
13108   Feld[x][y] = EL_ELEMENT_SNAPPING;
13109   MovDelay[x][y] = MOVE_DELAY_NORMAL_SPEED + 1 - 1;
13110
13111   ResetGfxAnimation(x, y);
13112
13113   GfxElement[x][y] = element;
13114   GfxAction[x][y] = action;
13115   GfxDir[x][y] = direction;
13116   GfxFrame[x][y] = -1;
13117 }
13118
13119 /*
13120   =============================================================================
13121   checkDiagonalPushing()
13122   -----------------------------------------------------------------------------
13123   check if diagonal input device direction results in pushing of object
13124   (by checking if the alternative direction is walkable, diggable, ...)
13125   =============================================================================
13126 */
13127
13128 static boolean checkDiagonalPushing(struct PlayerInfo *player,
13129                                     int x, int y, int real_dx, int real_dy)
13130 {
13131   int jx, jy, dx, dy, xx, yy;
13132
13133   if (real_dx == 0 || real_dy == 0)     /* no diagonal direction => push */
13134     return TRUE;
13135
13136   /* diagonal direction: check alternative direction */
13137   jx = player->jx;
13138   jy = player->jy;
13139   dx = x - jx;
13140   dy = y - jy;
13141   xx = jx + (dx == 0 ? real_dx : 0);
13142   yy = jy + (dy == 0 ? real_dy : 0);
13143
13144   return (!IN_LEV_FIELD(xx, yy) || IS_SOLID_FOR_PUSHING(Feld[xx][yy]));
13145 }
13146
13147 /*
13148   =============================================================================
13149   DigField()
13150   -----------------------------------------------------------------------------
13151   x, y:                 field next to player (non-diagonal) to try to dig to
13152   real_dx, real_dy:     direction as read from input device (can be diagonal)
13153   =============================================================================
13154 */
13155
13156 static int DigField(struct PlayerInfo *player,
13157                     int oldx, int oldy, int x, int y,
13158                     int real_dx, int real_dy, int mode)
13159 {
13160   boolean is_player = (IS_PLAYER(oldx, oldy) || mode != DF_DIG);
13161   boolean player_was_pushing = player->is_pushing;
13162   boolean player_can_move = (!player->cannot_move && mode != DF_SNAP);
13163   boolean player_can_move_or_snap = (!player->cannot_move || mode == DF_SNAP);
13164   int jx = oldx, jy = oldy;
13165   int dx = x - jx, dy = y - jy;
13166   int nextx = x + dx, nexty = y + dy;
13167   int move_direction = (dx == -1 ? MV_LEFT  :
13168                         dx == +1 ? MV_RIGHT :
13169                         dy == -1 ? MV_UP    :
13170                         dy == +1 ? MV_DOWN  : MV_NONE);
13171   int opposite_direction = MV_DIR_OPPOSITE(move_direction);
13172   int dig_side = MV_DIR_OPPOSITE(move_direction);
13173   int old_element = Feld[jx][jy];
13174   int element = MovingOrBlocked2ElementIfNotLeaving(x, y);
13175   int collect_count;
13176
13177   if (is_player)                /* function can also be called by EL_PENGUIN */
13178   {
13179     if (player->MovPos == 0)
13180     {
13181       player->is_digging = FALSE;
13182       player->is_collecting = FALSE;
13183     }
13184
13185     if (player->MovPos == 0)    /* last pushing move finished */
13186       player->is_pushing = FALSE;
13187
13188     if (mode == DF_NO_PUSH)     /* player just stopped pushing */
13189     {
13190       player->is_switching = FALSE;
13191       player->push_delay = -1;
13192
13193       return MP_NO_ACTION;
13194     }
13195   }
13196
13197   if (IS_TUBE(Back[jx][jy]) && game.engine_version >= VERSION_IDENT(2,2,0,0))
13198     old_element = Back[jx][jy];
13199
13200   /* in case of element dropped at player position, check background */
13201   else if (Back[jx][jy] != EL_EMPTY &&
13202            game.engine_version >= VERSION_IDENT(2,2,0,0))
13203     old_element = Back[jx][jy];
13204
13205   if (IS_WALKABLE(old_element) && !ACCESS_FROM(old_element, move_direction))
13206     return MP_NO_ACTION;        /* field has no opening in this direction */
13207
13208   if (IS_PASSABLE(old_element) && !ACCESS_FROM(old_element,opposite_direction))
13209     return MP_NO_ACTION;        /* field has no opening in this direction */
13210
13211   if (player_can_move && element == EL_ACID && move_direction == MV_DOWN)
13212   {
13213     SplashAcid(x, y);
13214
13215     Feld[jx][jy] = player->artwork_element;
13216     InitMovingField(jx, jy, MV_DOWN);
13217     Store[jx][jy] = EL_ACID;
13218     ContinueMoving(jx, jy);
13219     BuryPlayer(player);
13220
13221     return MP_DONT_RUN_INTO;
13222   }
13223
13224   if (player_can_move && DONT_RUN_INTO(element))
13225   {
13226     TestIfPlayerRunsIntoBadThing(jx, jy, player->MovDir);
13227
13228     return MP_DONT_RUN_INTO;
13229   }
13230
13231   if (IS_MOVING(x, y) || IS_PLAYER(x, y))
13232     return MP_NO_ACTION;
13233
13234   collect_count = element_info[element].collect_count_initial;
13235
13236   if (!is_player && !IS_COLLECTIBLE(element))   /* penguin cannot collect it */
13237     return MP_NO_ACTION;
13238
13239   if (game.engine_version < VERSION_IDENT(2,2,0,0))
13240     player_can_move = player_can_move_or_snap;
13241
13242   if (mode == DF_SNAP && !IS_SNAPPABLE(element) &&
13243       game.engine_version >= VERSION_IDENT(2,2,0,0))
13244   {
13245     CheckElementChangeByPlayer(x, y, element, CE_SNAPPED_BY_PLAYER,
13246                                player->index_bit, dig_side);
13247     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SNAPS_X,
13248                                         player->index_bit, dig_side);
13249
13250     if (element == EL_DC_LANDMINE)
13251       Bang(x, y);
13252
13253     if (Feld[x][y] != element)          /* field changed by snapping */
13254       return MP_ACTION;
13255
13256     return MP_NO_ACTION;
13257   }
13258
13259   if (player->gravity && is_player && !player->is_auto_moving &&
13260       canFallDown(player) && move_direction != MV_DOWN &&
13261       !canMoveToValidFieldWithGravity(jx, jy, move_direction))
13262     return MP_NO_ACTION;        /* player cannot walk here due to gravity */
13263
13264   if (player_can_move &&
13265       IS_WALKABLE(element) && ACCESS_FROM(element, opposite_direction))
13266   {
13267     int sound_element = SND_ELEMENT(element);
13268     int sound_action = ACTION_WALKING;
13269
13270     if (IS_RND_GATE(element))
13271     {
13272       if (!player->key[RND_GATE_NR(element)])
13273         return MP_NO_ACTION;
13274     }
13275     else if (IS_RND_GATE_GRAY(element))
13276     {
13277       if (!player->key[RND_GATE_GRAY_NR(element)])
13278         return MP_NO_ACTION;
13279     }
13280     else if (IS_RND_GATE_GRAY_ACTIVE(element))
13281     {
13282       if (!player->key[RND_GATE_GRAY_ACTIVE_NR(element)])
13283         return MP_NO_ACTION;
13284     }
13285     else if (element == EL_EXIT_OPEN ||
13286              element == EL_EM_EXIT_OPEN ||
13287              element == EL_EM_EXIT_OPENING ||
13288              element == EL_STEEL_EXIT_OPEN ||
13289              element == EL_EM_STEEL_EXIT_OPEN ||
13290              element == EL_EM_STEEL_EXIT_OPENING ||
13291              element == EL_SP_EXIT_OPEN ||
13292              element == EL_SP_EXIT_OPENING)
13293     {
13294       sound_action = ACTION_PASSING;    /* player is passing exit */
13295     }
13296     else if (element == EL_EMPTY)
13297     {
13298       sound_action = ACTION_MOVING;             /* nothing to walk on */
13299     }
13300
13301     /* play sound from background or player, whatever is available */
13302     if (element_info[sound_element].sound[sound_action] != SND_UNDEFINED)
13303       PlayLevelSoundElementAction(x, y, sound_element, sound_action);
13304     else
13305       PlayLevelSoundElementAction(x, y, player->artwork_element, sound_action);
13306   }
13307   else if (player_can_move &&
13308            IS_PASSABLE(element) && canPassField(x, y, move_direction))
13309   {
13310     if (!ACCESS_FROM(element, opposite_direction))
13311       return MP_NO_ACTION;      /* field not accessible from this direction */
13312
13313     if (CAN_MOVE(element))      /* only fixed elements can be passed! */
13314       return MP_NO_ACTION;
13315
13316     if (IS_EM_GATE(element))
13317     {
13318       if (!player->key[EM_GATE_NR(element)])
13319         return MP_NO_ACTION;
13320     }
13321     else if (IS_EM_GATE_GRAY(element))
13322     {
13323       if (!player->key[EM_GATE_GRAY_NR(element)])
13324         return MP_NO_ACTION;
13325     }
13326     else if (IS_EM_GATE_GRAY_ACTIVE(element))
13327     {
13328       if (!player->key[EM_GATE_GRAY_ACTIVE_NR(element)])
13329         return MP_NO_ACTION;
13330     }
13331     else if (IS_EMC_GATE(element))
13332     {
13333       if (!player->key[EMC_GATE_NR(element)])
13334         return MP_NO_ACTION;
13335     }
13336     else if (IS_EMC_GATE_GRAY(element))
13337     {
13338       if (!player->key[EMC_GATE_GRAY_NR(element)])
13339         return MP_NO_ACTION;
13340     }
13341     else if (IS_EMC_GATE_GRAY_ACTIVE(element))
13342     {
13343       if (!player->key[EMC_GATE_GRAY_ACTIVE_NR(element)])
13344         return MP_NO_ACTION;
13345     }
13346     else if (element == EL_DC_GATE_WHITE ||
13347              element == EL_DC_GATE_WHITE_GRAY ||
13348              element == EL_DC_GATE_WHITE_GRAY_ACTIVE)
13349     {
13350       if (player->num_white_keys == 0)
13351         return MP_NO_ACTION;
13352
13353       player->num_white_keys--;
13354     }
13355     else if (IS_SP_PORT(element))
13356     {
13357       if (element == EL_SP_GRAVITY_PORT_LEFT ||
13358           element == EL_SP_GRAVITY_PORT_RIGHT ||
13359           element == EL_SP_GRAVITY_PORT_UP ||
13360           element == EL_SP_GRAVITY_PORT_DOWN)
13361         player->gravity = !player->gravity;
13362       else if (element == EL_SP_GRAVITY_ON_PORT_LEFT ||
13363                element == EL_SP_GRAVITY_ON_PORT_RIGHT ||
13364                element == EL_SP_GRAVITY_ON_PORT_UP ||
13365                element == EL_SP_GRAVITY_ON_PORT_DOWN)
13366         player->gravity = TRUE;
13367       else if (element == EL_SP_GRAVITY_OFF_PORT_LEFT ||
13368                element == EL_SP_GRAVITY_OFF_PORT_RIGHT ||
13369                element == EL_SP_GRAVITY_OFF_PORT_UP ||
13370                element == EL_SP_GRAVITY_OFF_PORT_DOWN)
13371         player->gravity = FALSE;
13372     }
13373
13374     /* automatically move to the next field with double speed */
13375     player->programmed_action = move_direction;
13376
13377     if (player->move_delay_reset_counter == 0)
13378     {
13379       player->move_delay_reset_counter = 2;     /* two double speed steps */
13380
13381       DOUBLE_PLAYER_SPEED(player);
13382     }
13383
13384     PlayLevelSoundAction(x, y, ACTION_PASSING);
13385   }
13386   else if (player_can_move_or_snap && IS_DIGGABLE(element))
13387   {
13388     RemoveField(x, y);
13389
13390     if (mode != DF_SNAP)
13391     {
13392       GfxElement[x][y] = GFX_ELEMENT(element);
13393       player->is_digging = TRUE;
13394     }
13395
13396     PlayLevelSoundElementAction(x, y, element, ACTION_DIGGING);
13397
13398     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_DIGS_X,
13399                                         player->index_bit, dig_side);
13400
13401     if (mode == DF_SNAP)
13402     {
13403       if (level.block_snap_field)
13404         setFieldForSnapping(x, y, element, move_direction);
13405       else
13406         TestIfElementTouchesCustomElement(x, y);        /* for empty space */
13407
13408       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SNAPS_X,
13409                                           player->index_bit, dig_side);
13410     }
13411   }
13412   else if (player_can_move_or_snap && IS_COLLECTIBLE(element))
13413   {
13414     RemoveField(x, y);
13415
13416     if (is_player && mode != DF_SNAP)
13417     {
13418       GfxElement[x][y] = element;
13419       player->is_collecting = TRUE;
13420     }
13421
13422     if (element == EL_SPEED_PILL)
13423     {
13424       player->move_delay_value = MOVE_DELAY_HIGH_SPEED;
13425     }
13426     else if (element == EL_EXTRA_TIME && level.time > 0)
13427     {
13428       TimeLeft += level.extra_time;
13429
13430       game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
13431
13432       DisplayGameControlValues();
13433     }
13434     else if (element == EL_SHIELD_NORMAL || element == EL_SHIELD_DEADLY)
13435     {
13436       player->shield_normal_time_left += level.shield_normal_time;
13437       if (element == EL_SHIELD_DEADLY)
13438         player->shield_deadly_time_left += level.shield_deadly_time;
13439     }
13440     else if (element == EL_DYNAMITE ||
13441              element == EL_EM_DYNAMITE ||
13442              element == EL_SP_DISK_RED)
13443     {
13444       if (player->inventory_size < MAX_INVENTORY_SIZE)
13445         player->inventory_element[player->inventory_size++] = element;
13446
13447       DrawGameDoorValues();
13448     }
13449     else if (element == EL_DYNABOMB_INCREASE_NUMBER)
13450     {
13451       player->dynabomb_count++;
13452       player->dynabombs_left++;
13453     }
13454     else if (element == EL_DYNABOMB_INCREASE_SIZE)
13455     {
13456       player->dynabomb_size++;
13457     }
13458     else if (element == EL_DYNABOMB_INCREASE_POWER)
13459     {
13460       player->dynabomb_xl = TRUE;
13461     }
13462     else if (IS_KEY(element))
13463     {
13464       player->key[KEY_NR(element)] = TRUE;
13465
13466       DrawGameDoorValues();
13467     }
13468     else if (element == EL_DC_KEY_WHITE)
13469     {
13470       player->num_white_keys++;
13471
13472       /* display white keys? */
13473       /* DrawGameDoorValues(); */
13474     }
13475     else if (IS_ENVELOPE(element))
13476     {
13477       player->show_envelope = element;
13478     }
13479     else if (element == EL_EMC_LENSES)
13480     {
13481       game.lenses_time_left = level.lenses_time * FRAMES_PER_SECOND;
13482
13483       RedrawAllInvisibleElementsForLenses();
13484     }
13485     else if (element == EL_EMC_MAGNIFIER)
13486     {
13487       game.magnify_time_left = level.magnify_time * FRAMES_PER_SECOND;
13488
13489       RedrawAllInvisibleElementsForMagnifier();
13490     }
13491     else if (IS_DROPPABLE(element) ||
13492              IS_THROWABLE(element))     /* can be collected and dropped */
13493     {
13494       int i;
13495
13496       if (collect_count == 0)
13497         player->inventory_infinite_element = element;
13498       else
13499         for (i = 0; i < collect_count; i++)
13500           if (player->inventory_size < MAX_INVENTORY_SIZE)
13501             player->inventory_element[player->inventory_size++] = element;
13502
13503       DrawGameDoorValues();
13504     }
13505     else if (collect_count > 0)
13506     {
13507       local_player->gems_still_needed -= collect_count;
13508       if (local_player->gems_still_needed < 0)
13509         local_player->gems_still_needed = 0;
13510
13511       game.snapshot.collected_item = TRUE;
13512
13513       game_panel_controls[GAME_PANEL_GEMS].value = local_player->gems_still_needed;
13514
13515       DisplayGameControlValues();
13516     }
13517
13518     RaiseScoreElement(element);
13519     PlayLevelSoundElementAction(x, y, element, ACTION_COLLECTING);
13520
13521     if (is_player)
13522       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_COLLECTS_X,
13523                                           player->index_bit, dig_side);
13524
13525     if (mode == DF_SNAP)
13526     {
13527       if (level.block_snap_field)
13528         setFieldForSnapping(x, y, element, move_direction);
13529       else
13530         TestIfElementTouchesCustomElement(x, y);        /* for empty space */
13531
13532       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SNAPS_X,
13533                                           player->index_bit, dig_side);
13534     }
13535   }
13536   else if (player_can_move_or_snap && IS_PUSHABLE(element))
13537   {
13538     if (mode == DF_SNAP && element != EL_BD_ROCK)
13539       return MP_NO_ACTION;
13540
13541     if (CAN_FALL(element) && dy)
13542       return MP_NO_ACTION;
13543
13544     if (CAN_FALL(element) && IN_LEV_FIELD(x, y + 1) && IS_FREE(x, y + 1) &&
13545         !(element == EL_SPRING && level.use_spring_bug))
13546       return MP_NO_ACTION;
13547
13548     if (CAN_MOVE(element) && GET_MAX_MOVE_DELAY(element) == 0 &&
13549         ((move_direction & MV_VERTICAL &&
13550           ((element_info[element].move_pattern & MV_LEFT &&
13551             IN_LEV_FIELD(x - 1, y) && IS_FREE(x - 1, y)) ||
13552            (element_info[element].move_pattern & MV_RIGHT &&
13553             IN_LEV_FIELD(x + 1, y) && IS_FREE(x + 1, y)))) ||
13554          (move_direction & MV_HORIZONTAL &&
13555           ((element_info[element].move_pattern & MV_UP &&
13556             IN_LEV_FIELD(x, y - 1) && IS_FREE(x, y - 1)) ||
13557            (element_info[element].move_pattern & MV_DOWN &&
13558             IN_LEV_FIELD(x, y + 1) && IS_FREE(x, y + 1))))))
13559       return MP_NO_ACTION;
13560
13561     /* do not push elements already moving away faster than player */
13562     if (CAN_MOVE(element) && MovDir[x][y] == move_direction &&
13563         ABS(getElementMoveStepsize(x, y)) > MOVE_STEPSIZE_NORMAL)
13564       return MP_NO_ACTION;
13565
13566     if (game.engine_version >= VERSION_IDENT(3,1,0,0))
13567     {
13568       if (player->push_delay_value == -1 || !player_was_pushing)
13569         player->push_delay_value = GET_NEW_PUSH_DELAY(element);
13570     }
13571     else if (game.engine_version >= VERSION_IDENT(3,0,7,1))
13572     {
13573       if (player->push_delay_value == -1)
13574         player->push_delay_value = GET_NEW_PUSH_DELAY(element);
13575     }
13576     else if (game.engine_version >= VERSION_IDENT(2,2,0,7))
13577     {
13578       if (!player->is_pushing)
13579         player->push_delay_value = GET_NEW_PUSH_DELAY(element);
13580     }
13581
13582     player->is_pushing = TRUE;
13583     player->is_active = TRUE;
13584
13585     if (!(IN_LEV_FIELD(nextx, nexty) &&
13586           (IS_FREE(nextx, nexty) ||
13587            (IS_SB_ELEMENT(element) &&
13588             Feld[nextx][nexty] == EL_SOKOBAN_FIELD_EMPTY) ||
13589            (IS_CUSTOM_ELEMENT(element) &&
13590             CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, nextx, nexty)))))
13591       return MP_NO_ACTION;
13592
13593     if (!checkDiagonalPushing(player, x, y, real_dx, real_dy))
13594       return MP_NO_ACTION;
13595
13596     if (player->push_delay == -1)       /* new pushing; restart delay */
13597       player->push_delay = 0;
13598
13599     if (player->push_delay < player->push_delay_value &&
13600         !(tape.playing && tape.file_version < FILE_VERSION_2_0) &&
13601         element != EL_SPRING && element != EL_BALLOON)
13602     {
13603       /* make sure that there is no move delay before next try to push */
13604       if (game.engine_version >= VERSION_IDENT(3,0,7,1))
13605         player->move_delay = 0;
13606
13607       return MP_NO_ACTION;
13608     }
13609
13610     if (IS_CUSTOM_ELEMENT(element) &&
13611         CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, nextx, nexty))
13612     {
13613       if (!DigFieldByCE(nextx, nexty, element))
13614         return MP_NO_ACTION;
13615     }
13616
13617     if (IS_SB_ELEMENT(element))
13618     {
13619       if (element == EL_SOKOBAN_FIELD_FULL)
13620       {
13621         Back[x][y] = EL_SOKOBAN_FIELD_EMPTY;
13622         local_player->sokobanfields_still_needed++;
13623       }
13624
13625       if (Feld[nextx][nexty] == EL_SOKOBAN_FIELD_EMPTY)
13626       {
13627         Back[nextx][nexty] = EL_SOKOBAN_FIELD_EMPTY;
13628         local_player->sokobanfields_still_needed--;
13629       }
13630
13631       Feld[x][y] = EL_SOKOBAN_OBJECT;
13632
13633       if (Back[x][y] == Back[nextx][nexty])
13634         PlayLevelSoundAction(x, y, ACTION_PUSHING);
13635       else if (Back[x][y] != 0)
13636         PlayLevelSoundElementAction(x, y, EL_SOKOBAN_FIELD_FULL,
13637                                     ACTION_EMPTYING);
13638       else
13639         PlayLevelSoundElementAction(nextx, nexty, EL_SOKOBAN_FIELD_EMPTY,
13640                                     ACTION_FILLING);
13641
13642       if (local_player->sokobanfields_still_needed == 0 &&
13643           (game.emulation == EMU_SOKOBAN || level.auto_exit_sokoban))
13644       {
13645         PlayerWins(player);
13646
13647         PlayLevelSound(x, y, SND_GAME_SOKOBAN_SOLVING);
13648       }
13649     }
13650     else
13651       PlayLevelSoundElementAction(x, y, element, ACTION_PUSHING);
13652
13653     InitMovingField(x, y, move_direction);
13654     GfxAction[x][y] = ACTION_PUSHING;
13655
13656     if (mode == DF_SNAP)
13657       ContinueMoving(x, y);
13658     else
13659       MovPos[x][y] = (dx != 0 ? dx : dy);
13660
13661     Pushed[x][y] = TRUE;
13662     Pushed[nextx][nexty] = TRUE;
13663
13664     if (game.engine_version < VERSION_IDENT(2,2,0,7))
13665       player->push_delay_value = GET_NEW_PUSH_DELAY(element);
13666     else
13667       player->push_delay_value = -1;    /* get new value later */
13668
13669     /* check for element change _after_ element has been pushed */
13670     if (game.use_change_when_pushing_bug)
13671     {
13672       CheckElementChangeByPlayer(x, y, element, CE_PUSHED_BY_PLAYER,
13673                                  player->index_bit, dig_side);
13674       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_PUSHES_X,
13675                                           player->index_bit, dig_side);
13676     }
13677   }
13678   else if (IS_SWITCHABLE(element))
13679   {
13680     if (PLAYER_SWITCHING(player, x, y))
13681     {
13682       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_PRESSES_X,
13683                                           player->index_bit, dig_side);
13684
13685       return MP_ACTION;
13686     }
13687
13688     player->is_switching = TRUE;
13689     player->switch_x = x;
13690     player->switch_y = y;
13691
13692     PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVATING);
13693
13694     if (element == EL_ROBOT_WHEEL)
13695     {
13696       Feld[x][y] = EL_ROBOT_WHEEL_ACTIVE;
13697       ZX = x;
13698       ZY = y;
13699
13700       game.robot_wheel_active = TRUE;
13701
13702       TEST_DrawLevelField(x, y);
13703     }
13704     else if (element == EL_SP_TERMINAL)
13705     {
13706       int xx, yy;
13707
13708       SCAN_PLAYFIELD(xx, yy)
13709       {
13710         if (Feld[xx][yy] == EL_SP_DISK_YELLOW)
13711         {
13712           Bang(xx, yy);
13713         }
13714         else if (Feld[xx][yy] == EL_SP_TERMINAL)
13715         {
13716           Feld[xx][yy] = EL_SP_TERMINAL_ACTIVE;
13717
13718           ResetGfxAnimation(xx, yy);
13719           TEST_DrawLevelField(xx, yy);
13720         }
13721       }
13722     }
13723     else if (IS_BELT_SWITCH(element))
13724     {
13725       ToggleBeltSwitch(x, y);
13726     }
13727     else if (element == EL_SWITCHGATE_SWITCH_UP ||
13728              element == EL_SWITCHGATE_SWITCH_DOWN ||
13729              element == EL_DC_SWITCHGATE_SWITCH_UP ||
13730              element == EL_DC_SWITCHGATE_SWITCH_DOWN)
13731     {
13732       ToggleSwitchgateSwitch(x, y);
13733     }
13734     else if (element == EL_LIGHT_SWITCH ||
13735              element == EL_LIGHT_SWITCH_ACTIVE)
13736     {
13737       ToggleLightSwitch(x, y);
13738     }
13739     else if (element == EL_TIMEGATE_SWITCH ||
13740              element == EL_DC_TIMEGATE_SWITCH)
13741     {
13742       ActivateTimegateSwitch(x, y);
13743     }
13744     else if (element == EL_BALLOON_SWITCH_LEFT  ||
13745              element == EL_BALLOON_SWITCH_RIGHT ||
13746              element == EL_BALLOON_SWITCH_UP    ||
13747              element == EL_BALLOON_SWITCH_DOWN  ||
13748              element == EL_BALLOON_SWITCH_NONE  ||
13749              element == EL_BALLOON_SWITCH_ANY)
13750     {
13751       game.wind_direction = (element == EL_BALLOON_SWITCH_LEFT  ? MV_LEFT  :
13752                              element == EL_BALLOON_SWITCH_RIGHT ? MV_RIGHT :
13753                              element == EL_BALLOON_SWITCH_UP    ? MV_UP    :
13754                              element == EL_BALLOON_SWITCH_DOWN  ? MV_DOWN  :
13755                              element == EL_BALLOON_SWITCH_NONE  ? MV_NONE  :
13756                              move_direction);
13757     }
13758     else if (element == EL_LAMP)
13759     {
13760       Feld[x][y] = EL_LAMP_ACTIVE;
13761       local_player->lights_still_needed--;
13762
13763       ResetGfxAnimation(x, y);
13764       TEST_DrawLevelField(x, y);
13765     }
13766     else if (element == EL_TIME_ORB_FULL)
13767     {
13768       Feld[x][y] = EL_TIME_ORB_EMPTY;
13769
13770       if (level.time > 0 || level.use_time_orb_bug)
13771       {
13772         TimeLeft += level.time_orb_time;
13773         game.no_time_limit = FALSE;
13774
13775         game_panel_controls[GAME_PANEL_TIME].value = TimeLeft;
13776
13777         DisplayGameControlValues();
13778       }
13779
13780       ResetGfxAnimation(x, y);
13781       TEST_DrawLevelField(x, y);
13782     }
13783     else if (element == EL_EMC_MAGIC_BALL_SWITCH ||
13784              element == EL_EMC_MAGIC_BALL_SWITCH_ACTIVE)
13785     {
13786       int xx, yy;
13787
13788       game.ball_state = !game.ball_state;
13789
13790       SCAN_PLAYFIELD(xx, yy)
13791       {
13792         int e = Feld[xx][yy];
13793
13794         if (game.ball_state)
13795         {
13796           if (e == EL_EMC_MAGIC_BALL)
13797             CreateField(xx, yy, EL_EMC_MAGIC_BALL_ACTIVE);
13798           else if (e == EL_EMC_MAGIC_BALL_SWITCH)
13799             CreateField(xx, yy, EL_EMC_MAGIC_BALL_SWITCH_ACTIVE);
13800         }
13801         else
13802         {
13803           if (e == EL_EMC_MAGIC_BALL_ACTIVE)
13804             CreateField(xx, yy, EL_EMC_MAGIC_BALL);
13805           else if (e == EL_EMC_MAGIC_BALL_SWITCH_ACTIVE)
13806             CreateField(xx, yy, EL_EMC_MAGIC_BALL_SWITCH);
13807         }
13808       }
13809     }
13810
13811     CheckTriggeredElementChangeByPlayer(x, y, element, CE_SWITCH_OF_X,
13812                                         player->index_bit, dig_side);
13813
13814     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SWITCHES_X,
13815                                         player->index_bit, dig_side);
13816
13817     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_PRESSES_X,
13818                                         player->index_bit, dig_side);
13819
13820     return MP_ACTION;
13821   }
13822   else
13823   {
13824     if (!PLAYER_SWITCHING(player, x, y))
13825     {
13826       player->is_switching = TRUE;
13827       player->switch_x = x;
13828       player->switch_y = y;
13829
13830       CheckElementChangeByPlayer(x, y, element, CE_SWITCHED,
13831                                  player->index_bit, dig_side);
13832       CheckTriggeredElementChangeByPlayer(x, y, element, CE_SWITCH_OF_X,
13833                                           player->index_bit, dig_side);
13834
13835       CheckElementChangeByPlayer(x, y, element, CE_SWITCHED_BY_PLAYER,
13836                                  player->index_bit, dig_side);
13837       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SWITCHES_X,
13838                                           player->index_bit, dig_side);
13839     }
13840
13841     CheckElementChangeByPlayer(x, y, element, CE_PRESSED_BY_PLAYER,
13842                                player->index_bit, dig_side);
13843     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_PRESSES_X,
13844                                         player->index_bit, dig_side);
13845
13846     return MP_NO_ACTION;
13847   }
13848
13849   player->push_delay = -1;
13850
13851   if (is_player)                /* function can also be called by EL_PENGUIN */
13852   {
13853     if (Feld[x][y] != element)          /* really digged/collected something */
13854     {
13855       player->is_collecting = !player->is_digging;
13856       player->is_active = TRUE;
13857     }
13858   }
13859
13860   return MP_MOVING;
13861 }
13862
13863 static boolean DigFieldByCE(int x, int y, int digging_element)
13864 {
13865   int element = Feld[x][y];
13866
13867   if (!IS_FREE(x, y))
13868   {
13869     int action = (IS_DIGGABLE(element) ? ACTION_DIGGING :
13870                   IS_COLLECTIBLE(element) ? ACTION_COLLECTING :
13871                   ACTION_BREAKING);
13872
13873     /* no element can dig solid indestructible elements */
13874     if (IS_INDESTRUCTIBLE(element) &&
13875         !IS_DIGGABLE(element) &&
13876         !IS_COLLECTIBLE(element))
13877       return FALSE;
13878
13879     if (AmoebaNr[x][y] &&
13880         (element == EL_AMOEBA_FULL ||
13881          element == EL_BD_AMOEBA ||
13882          element == EL_AMOEBA_GROWING))
13883     {
13884       AmoebaCnt[AmoebaNr[x][y]]--;
13885       AmoebaCnt2[AmoebaNr[x][y]]--;
13886     }
13887
13888     if (IS_MOVING(x, y))
13889       RemoveMovingField(x, y);
13890     else
13891     {
13892       RemoveField(x, y);
13893       TEST_DrawLevelField(x, y);
13894     }
13895
13896     /* if digged element was about to explode, prevent the explosion */
13897     ExplodeField[x][y] = EX_TYPE_NONE;
13898
13899     PlayLevelSoundAction(x, y, action);
13900   }
13901
13902   Store[x][y] = EL_EMPTY;
13903
13904   /* this makes it possible to leave the removed element again */
13905   if (IS_EQUAL_OR_IN_GROUP(element, MOVE_ENTER_EL(digging_element)))
13906     Store[x][y] = element;
13907
13908   return TRUE;
13909 }
13910
13911 static boolean SnapField(struct PlayerInfo *player, int dx, int dy)
13912 {
13913   int jx = player->jx, jy = player->jy;
13914   int x = jx + dx, y = jy + dy;
13915   int snap_direction = (dx == -1 ? MV_LEFT  :
13916                         dx == +1 ? MV_RIGHT :
13917                         dy == -1 ? MV_UP    :
13918                         dy == +1 ? MV_DOWN  : MV_NONE);
13919   boolean can_continue_snapping = (level.continuous_snapping &&
13920                                    WasJustFalling[x][y] < CHECK_DELAY_FALLING);
13921
13922   if (player->MovPos != 0 && game.engine_version >= VERSION_IDENT(2,2,0,0))
13923     return FALSE;
13924
13925   if (!player->active || !IN_LEV_FIELD(x, y))
13926     return FALSE;
13927
13928   if (dx && dy)
13929     return FALSE;
13930
13931   if (!dx && !dy)
13932   {
13933     if (player->MovPos == 0)
13934       player->is_pushing = FALSE;
13935
13936     player->is_snapping = FALSE;
13937
13938     if (player->MovPos == 0)
13939     {
13940       player->is_moving = FALSE;
13941       player->is_digging = FALSE;
13942       player->is_collecting = FALSE;
13943     }
13944
13945     return FALSE;
13946   }
13947
13948   /* prevent snapping with already pressed snap key when not allowed */
13949   if (player->is_snapping && !can_continue_snapping)
13950     return FALSE;
13951
13952   player->MovDir = snap_direction;
13953
13954   if (player->MovPos == 0)
13955   {
13956     player->is_moving = FALSE;
13957     player->is_digging = FALSE;
13958     player->is_collecting = FALSE;
13959   }
13960
13961   player->is_dropping = FALSE;
13962   player->is_dropping_pressed = FALSE;
13963   player->drop_pressed_delay = 0;
13964
13965   if (DigField(player, jx, jy, x, y, 0, 0, DF_SNAP) == MP_NO_ACTION)
13966     return FALSE;
13967
13968   player->is_snapping = TRUE;
13969   player->is_active = TRUE;
13970
13971   if (player->MovPos == 0)
13972   {
13973     player->is_moving = FALSE;
13974     player->is_digging = FALSE;
13975     player->is_collecting = FALSE;
13976   }
13977
13978   if (player->MovPos != 0)      /* prevent graphic bugs in versions < 2.2.0 */
13979     TEST_DrawLevelField(player->last_jx, player->last_jy);
13980
13981   TEST_DrawLevelField(x, y);
13982
13983   return TRUE;
13984 }
13985
13986 static boolean DropElement(struct PlayerInfo *player)
13987 {
13988   int old_element, new_element;
13989   int dropx = player->jx, dropy = player->jy;
13990   int drop_direction = player->MovDir;
13991   int drop_side = drop_direction;
13992   int drop_element = get_next_dropped_element(player);
13993
13994   /* do not drop an element on top of another element; when holding drop key
13995      pressed without moving, dropped element must move away before the next
13996      element can be dropped (this is especially important if the next element
13997      is dynamite, which can be placed on background for historical reasons) */
13998   if (PLAYER_DROPPING(player, dropx, dropy) && Feld[dropx][dropy] != EL_EMPTY)
13999     return MP_ACTION;
14000
14001   if (IS_THROWABLE(drop_element))
14002   {
14003     dropx += GET_DX_FROM_DIR(drop_direction);
14004     dropy += GET_DY_FROM_DIR(drop_direction);
14005
14006     if (!IN_LEV_FIELD(dropx, dropy))
14007       return FALSE;
14008   }
14009
14010   old_element = Feld[dropx][dropy];     /* old element at dropping position */
14011   new_element = drop_element;           /* default: no change when dropping */
14012
14013   /* check if player is active, not moving and ready to drop */
14014   if (!player->active || player->MovPos || player->drop_delay > 0)
14015     return FALSE;
14016
14017   /* check if player has anything that can be dropped */
14018   if (new_element == EL_UNDEFINED)
14019     return FALSE;
14020
14021   /* only set if player has anything that can be dropped */
14022   player->is_dropping_pressed = TRUE;
14023
14024   /* check if drop key was pressed long enough for EM style dynamite */
14025   if (new_element == EL_EM_DYNAMITE && player->drop_pressed_delay < 40)
14026     return FALSE;
14027
14028   /* check if anything can be dropped at the current position */
14029   if (IS_ACTIVE_BOMB(old_element) || old_element == EL_EXPLOSION)
14030     return FALSE;
14031
14032   /* collected custom elements can only be dropped on empty fields */
14033   if (IS_CUSTOM_ELEMENT(new_element) && old_element != EL_EMPTY)
14034     return FALSE;
14035
14036   if (old_element != EL_EMPTY)
14037     Back[dropx][dropy] = old_element;   /* store old element on this field */
14038
14039   ResetGfxAnimation(dropx, dropy);
14040   ResetRandomAnimationValue(dropx, dropy);
14041
14042   if (player->inventory_size > 0 ||
14043       player->inventory_infinite_element != EL_UNDEFINED)
14044   {
14045     if (player->inventory_size > 0)
14046     {
14047       player->inventory_size--;
14048
14049       DrawGameDoorValues();
14050
14051       if (new_element == EL_DYNAMITE)
14052         new_element = EL_DYNAMITE_ACTIVE;
14053       else if (new_element == EL_EM_DYNAMITE)
14054         new_element = EL_EM_DYNAMITE_ACTIVE;
14055       else if (new_element == EL_SP_DISK_RED)
14056         new_element = EL_SP_DISK_RED_ACTIVE;
14057     }
14058
14059     Feld[dropx][dropy] = new_element;
14060
14061     if (IN_SCR_FIELD(SCREENX(dropx), SCREENY(dropy)))
14062       DrawGraphicThruMask(SCREENX(dropx), SCREENY(dropy),
14063                           el2img(Feld[dropx][dropy]), 0);
14064
14065     PlayLevelSoundAction(dropx, dropy, ACTION_DROPPING);
14066
14067     /* needed if previous element just changed to "empty" in the last frame */
14068     ChangeCount[dropx][dropy] = 0;      /* allow at least one more change */
14069
14070     CheckElementChangeByPlayer(dropx, dropy, new_element, CE_DROPPED_BY_PLAYER,
14071                                player->index_bit, drop_side);
14072     CheckTriggeredElementChangeByPlayer(dropx, dropy, new_element,
14073                                         CE_PLAYER_DROPS_X,
14074                                         player->index_bit, drop_side);
14075
14076     TestIfElementTouchesCustomElement(dropx, dropy);
14077   }
14078   else          /* player is dropping a dyna bomb */
14079   {
14080     player->dynabombs_left--;
14081
14082     Feld[dropx][dropy] = new_element;
14083
14084     if (IN_SCR_FIELD(SCREENX(dropx), SCREENY(dropy)))
14085       DrawGraphicThruMask(SCREENX(dropx), SCREENY(dropy),
14086                           el2img(Feld[dropx][dropy]), 0);
14087
14088     PlayLevelSoundAction(dropx, dropy, ACTION_DROPPING);
14089   }
14090
14091   if (Feld[dropx][dropy] == new_element) /* uninitialized unless CE change */
14092     InitField_WithBug1(dropx, dropy, FALSE);
14093
14094   new_element = Feld[dropx][dropy];     /* element might have changed */
14095
14096   if (IS_CUSTOM_ELEMENT(new_element) && CAN_MOVE(new_element) &&
14097       element_info[new_element].move_pattern == MV_WHEN_DROPPED)
14098   {
14099     if (element_info[new_element].move_direction_initial == MV_START_AUTOMATIC)
14100       MovDir[dropx][dropy] = drop_direction;
14101
14102     ChangeCount[dropx][dropy] = 0;      /* allow at least one more change */
14103
14104     /* do not cause impact style collision by dropping elements that can fall */
14105     CheckCollision[dropx][dropy] = CHECK_DELAY_COLLISION;
14106   }
14107
14108   player->drop_delay = GET_NEW_DROP_DELAY(drop_element);
14109   player->is_dropping = TRUE;
14110
14111   player->drop_pressed_delay = 0;
14112   player->is_dropping_pressed = FALSE;
14113
14114   player->drop_x = dropx;
14115   player->drop_y = dropy;
14116
14117   return TRUE;
14118 }
14119
14120 /* ------------------------------------------------------------------------- */
14121 /* game sound playing functions                                              */
14122 /* ------------------------------------------------------------------------- */
14123
14124 static int *loop_sound_frame = NULL;
14125 static int *loop_sound_volume = NULL;
14126
14127 void InitPlayLevelSound()
14128 {
14129   int num_sounds = getSoundListSize();
14130
14131   checked_free(loop_sound_frame);
14132   checked_free(loop_sound_volume);
14133
14134   loop_sound_frame  = checked_calloc(num_sounds * sizeof(int));
14135   loop_sound_volume = checked_calloc(num_sounds * sizeof(int));
14136 }
14137
14138 static void PlayLevelSound(int x, int y, int nr)
14139 {
14140   int sx = SCREENX(x), sy = SCREENY(y);
14141   int volume, stereo_position;
14142   int max_distance = 8;
14143   int type = (IS_LOOP_SOUND(nr) ? SND_CTRL_PLAY_LOOP : SND_CTRL_PLAY_SOUND);
14144
14145   if ((!setup.sound_simple && !IS_LOOP_SOUND(nr)) ||
14146       (!setup.sound_loops && IS_LOOP_SOUND(nr)))
14147     return;
14148
14149   if (!IN_LEV_FIELD(x, y) ||
14150       sx < -max_distance || sx >= SCR_FIELDX + max_distance ||
14151       sy < -max_distance || sy >= SCR_FIELDY + max_distance)
14152     return;
14153
14154   volume = SOUND_MAX_VOLUME;
14155
14156   if (!IN_SCR_FIELD(sx, sy))
14157   {
14158     int dx = ABS(sx - SCR_FIELDX / 2) - SCR_FIELDX / 2;
14159     int dy = ABS(sy - SCR_FIELDY / 2) - SCR_FIELDY / 2;
14160
14161     volume -= volume * (dx > dy ? dx : dy) / max_distance;
14162   }
14163
14164   stereo_position = (SOUND_MAX_LEFT +
14165                      (sx + max_distance) * SOUND_MAX_LEFT2RIGHT /
14166                      (SCR_FIELDX + 2 * max_distance));
14167
14168   if (IS_LOOP_SOUND(nr))
14169   {
14170     /* This assures that quieter loop sounds do not overwrite louder ones,
14171        while restarting sound volume comparison with each new game frame. */
14172
14173     if (loop_sound_volume[nr] > volume && loop_sound_frame[nr] == FrameCounter)
14174       return;
14175
14176     loop_sound_volume[nr] = volume;
14177     loop_sound_frame[nr] = FrameCounter;
14178   }
14179
14180   PlaySoundExt(nr, volume, stereo_position, type);
14181 }
14182
14183 static void PlayLevelSoundNearest(int x, int y, int sound_action)
14184 {
14185   PlayLevelSound(x < LEVELX(BX1) ? LEVELX(BX1) :
14186                  x > LEVELX(BX2) ? LEVELX(BX2) : x,
14187                  y < LEVELY(BY1) ? LEVELY(BY1) :
14188                  y > LEVELY(BY2) ? LEVELY(BY2) : y,
14189                  sound_action);
14190 }
14191
14192 static void PlayLevelSoundAction(int x, int y, int action)
14193 {
14194   PlayLevelSoundElementAction(x, y, Feld[x][y], action);
14195 }
14196
14197 static void PlayLevelSoundElementAction(int x, int y, int element, int action)
14198 {
14199   int sound_effect = element_info[SND_ELEMENT(element)].sound[action];
14200
14201   if (sound_effect != SND_UNDEFINED)
14202     PlayLevelSound(x, y, sound_effect);
14203 }
14204
14205 static void PlayLevelSoundElementActionIfLoop(int x, int y, int element,
14206                                               int action)
14207 {
14208   int sound_effect = element_info[SND_ELEMENT(element)].sound[action];
14209
14210   if (sound_effect != SND_UNDEFINED && IS_LOOP_SOUND(sound_effect))
14211     PlayLevelSound(x, y, sound_effect);
14212 }
14213
14214 static void PlayLevelSoundActionIfLoop(int x, int y, int action)
14215 {
14216   int sound_effect = element_info[SND_ELEMENT(Feld[x][y])].sound[action];
14217
14218   if (sound_effect != SND_UNDEFINED && IS_LOOP_SOUND(sound_effect))
14219     PlayLevelSound(x, y, sound_effect);
14220 }
14221
14222 static void StopLevelSoundActionIfLoop(int x, int y, int action)
14223 {
14224   int sound_effect = element_info[SND_ELEMENT(Feld[x][y])].sound[action];
14225
14226   if (sound_effect != SND_UNDEFINED && IS_LOOP_SOUND(sound_effect))
14227     StopSound(sound_effect);
14228 }
14229
14230 static void PlayLevelMusic()
14231 {
14232   if (levelset.music[level_nr] != MUS_UNDEFINED)
14233     PlayMusic(levelset.music[level_nr]);        /* from config file */
14234   else
14235     PlayMusic(MAP_NOCONF_MUSIC(level_nr));      /* from music dir */
14236 }
14237
14238 void PlayLevelSound_EM(int xx, int yy, int element_em, int sample)
14239 {
14240   int element = (element_em > -1 ? map_element_EM_to_RND(element_em) : 0);
14241   int offset = (BorderElement == EL_STEELWALL ? 1 : 0);
14242   int x = xx - 1 - offset;
14243   int y = yy - 1 - offset;
14244
14245   switch (sample)
14246   {
14247     case SAMPLE_blank:
14248       PlayLevelSoundElementAction(x, y, element, ACTION_WALKING);
14249       break;
14250
14251     case SAMPLE_roll:
14252       PlayLevelSoundElementAction(x, y, element, ACTION_PUSHING);
14253       break;
14254
14255     case SAMPLE_stone:
14256       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
14257       break;
14258
14259     case SAMPLE_nut:
14260       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
14261       break;
14262
14263     case SAMPLE_crack:
14264       PlayLevelSoundElementAction(x, y, element, ACTION_BREAKING);
14265       break;
14266
14267     case SAMPLE_bug:
14268       PlayLevelSoundElementAction(x, y, element, ACTION_MOVING);
14269       break;
14270
14271     case SAMPLE_tank:
14272       PlayLevelSoundElementAction(x, y, element, ACTION_MOVING);
14273       break;
14274
14275     case SAMPLE_android_clone:
14276       PlayLevelSoundElementAction(x, y, element, ACTION_DROPPING);
14277       break;
14278
14279     case SAMPLE_android_move:
14280       PlayLevelSoundElementAction(x, y, element, ACTION_MOVING);
14281       break;
14282
14283     case SAMPLE_spring:
14284       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
14285       break;
14286
14287     case SAMPLE_slurp:
14288       PlayLevelSoundElementAction(x, y, element, ACTION_EATING);
14289       break;
14290
14291     case SAMPLE_eater:
14292       PlayLevelSoundElementAction(x, y, element, ACTION_WAITING);
14293       break;
14294
14295     case SAMPLE_eater_eat:
14296       PlayLevelSoundElementAction(x, y, element, ACTION_DIGGING);
14297       break;
14298
14299     case SAMPLE_alien:
14300       PlayLevelSoundElementAction(x, y, element, ACTION_MOVING);
14301       break;
14302
14303     case SAMPLE_collect:
14304       PlayLevelSoundElementAction(x, y, element, ACTION_COLLECTING);
14305       break;
14306
14307     case SAMPLE_diamond:
14308       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
14309       break;
14310
14311     case SAMPLE_squash:
14312       /* !!! CHECK THIS !!! */
14313 #if 1
14314       PlayLevelSoundElementAction(x, y, element, ACTION_BREAKING);
14315 #else
14316       PlayLevelSoundElementAction(x, y, element, ACTION_SMASHED_BY_ROCK);
14317 #endif
14318       break;
14319
14320     case SAMPLE_wonderfall:
14321       PlayLevelSoundElementAction(x, y, element, ACTION_FILLING);
14322       break;
14323
14324     case SAMPLE_drip:
14325       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
14326       break;
14327
14328     case SAMPLE_push:
14329       PlayLevelSoundElementAction(x, y, element, ACTION_PUSHING);
14330       break;
14331
14332     case SAMPLE_dirt:
14333       PlayLevelSoundElementAction(x, y, element, ACTION_DIGGING);
14334       break;
14335
14336     case SAMPLE_acid:
14337       PlayLevelSoundElementAction(x, y, element, ACTION_SPLASHING);
14338       break;
14339
14340     case SAMPLE_ball:
14341       PlayLevelSoundElementAction(x, y, element, ACTION_DROPPING);
14342       break;
14343
14344     case SAMPLE_grow:
14345       PlayLevelSoundElementAction(x, y, element, ACTION_GROWING);
14346       break;
14347
14348     case SAMPLE_wonder:
14349       PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVE);
14350       break;
14351
14352     case SAMPLE_door:
14353       PlayLevelSoundElementAction(x, y, element, ACTION_PASSING);
14354       break;
14355
14356     case SAMPLE_exit_open:
14357       PlayLevelSoundElementAction(x, y, element, ACTION_OPENING);
14358       break;
14359
14360     case SAMPLE_exit_leave:
14361       PlayLevelSoundElementAction(x, y, element, ACTION_PASSING);
14362       break;
14363
14364     case SAMPLE_dynamite:
14365       PlayLevelSoundElementAction(x, y, element, ACTION_DROPPING);
14366       break;
14367
14368     case SAMPLE_tick:
14369       PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVE);
14370       break;
14371
14372     case SAMPLE_press:
14373       PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVATING);
14374       break;
14375
14376     case SAMPLE_wheel:
14377       PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVE);
14378       break;
14379
14380     case SAMPLE_boom:
14381       PlayLevelSoundElementAction(x, y, element, ACTION_EXPLODING);
14382       break;
14383
14384     case SAMPLE_die:
14385       PlayLevelSoundElementAction(x, y, element, ACTION_DYING);
14386       break;
14387
14388     case SAMPLE_time:
14389       PlaySound(SND_GAME_RUNNING_OUT_OF_TIME);
14390       break;
14391
14392     default:
14393       PlayLevelSoundElementAction(x, y, element, ACTION_DEFAULT);
14394       break;
14395   }
14396 }
14397
14398 void PlayLevelSound_SP(int xx, int yy, int element_sp, int action_sp)
14399 {
14400   int element = map_element_SP_to_RND(element_sp);
14401   int action = map_action_SP_to_RND(action_sp);
14402   int offset = (setup.sp_show_border_elements ? 0 : 1);
14403   int x = xx - offset;
14404   int y = yy - offset;
14405
14406   PlayLevelSoundElementAction(x, y, element, action);
14407 }
14408
14409 void RaiseScore(int value)
14410 {
14411   local_player->score += value;
14412
14413   game_panel_controls[GAME_PANEL_SCORE].value = local_player->score;
14414
14415   DisplayGameControlValues();
14416 }
14417
14418 void RaiseScoreElement(int element)
14419 {
14420   switch (element)
14421   {
14422     case EL_EMERALD:
14423     case EL_BD_DIAMOND:
14424     case EL_EMERALD_YELLOW:
14425     case EL_EMERALD_RED:
14426     case EL_EMERALD_PURPLE:
14427     case EL_SP_INFOTRON:
14428       RaiseScore(level.score[SC_EMERALD]);
14429       break;
14430     case EL_DIAMOND:
14431       RaiseScore(level.score[SC_DIAMOND]);
14432       break;
14433     case EL_CRYSTAL:
14434       RaiseScore(level.score[SC_CRYSTAL]);
14435       break;
14436     case EL_PEARL:
14437       RaiseScore(level.score[SC_PEARL]);
14438       break;
14439     case EL_BUG:
14440     case EL_BD_BUTTERFLY:
14441     case EL_SP_ELECTRON:
14442       RaiseScore(level.score[SC_BUG]);
14443       break;
14444     case EL_SPACESHIP:
14445     case EL_BD_FIREFLY:
14446     case EL_SP_SNIKSNAK:
14447       RaiseScore(level.score[SC_SPACESHIP]);
14448       break;
14449     case EL_YAMYAM:
14450     case EL_DARK_YAMYAM:
14451       RaiseScore(level.score[SC_YAMYAM]);
14452       break;
14453     case EL_ROBOT:
14454       RaiseScore(level.score[SC_ROBOT]);
14455       break;
14456     case EL_PACMAN:
14457       RaiseScore(level.score[SC_PACMAN]);
14458       break;
14459     case EL_NUT:
14460       RaiseScore(level.score[SC_NUT]);
14461       break;
14462     case EL_DYNAMITE:
14463     case EL_EM_DYNAMITE:
14464     case EL_SP_DISK_RED:
14465     case EL_DYNABOMB_INCREASE_NUMBER:
14466     case EL_DYNABOMB_INCREASE_SIZE:
14467     case EL_DYNABOMB_INCREASE_POWER:
14468       RaiseScore(level.score[SC_DYNAMITE]);
14469       break;
14470     case EL_SHIELD_NORMAL:
14471     case EL_SHIELD_DEADLY:
14472       RaiseScore(level.score[SC_SHIELD]);
14473       break;
14474     case EL_EXTRA_TIME:
14475       RaiseScore(level.extra_time_score);
14476       break;
14477     case EL_KEY_1:
14478     case EL_KEY_2:
14479     case EL_KEY_3:
14480     case EL_KEY_4:
14481     case EL_EM_KEY_1:
14482     case EL_EM_KEY_2:
14483     case EL_EM_KEY_3:
14484     case EL_EM_KEY_4:
14485     case EL_EMC_KEY_5:
14486     case EL_EMC_KEY_6:
14487     case EL_EMC_KEY_7:
14488     case EL_EMC_KEY_8:
14489     case EL_DC_KEY_WHITE:
14490       RaiseScore(level.score[SC_KEY]);
14491       break;
14492     default:
14493       RaiseScore(element_info[element].collect_score);
14494       break;
14495   }
14496 }
14497
14498 void RequestQuitGameExt(boolean skip_request, boolean quick_quit, char *message)
14499 {
14500   if (skip_request || Request(message, REQ_ASK | REQ_STAY_CLOSED))
14501   {
14502     /* closing door required in case of envelope style request dialogs */
14503     if (!skip_request)
14504       CloseDoor(DOOR_CLOSE_1);
14505
14506 #if defined(NETWORK_AVALIABLE)
14507     if (options.network)
14508       SendToServer_StopPlaying(NETWORK_STOP_BY_PLAYER);
14509     else
14510 #endif
14511     {
14512       if (quick_quit)
14513         FadeSkipNextFadeIn();
14514
14515       SetGameStatus(GAME_MODE_MAIN);
14516
14517       DrawMainMenu();
14518     }
14519   }
14520   else          /* continue playing the game */
14521   {
14522     if (tape.playing && tape.deactivate_display)
14523       TapeDeactivateDisplayOff(TRUE);
14524
14525     OpenDoor(DOOR_OPEN_1 | DOOR_COPY_BACK);
14526
14527     if (tape.playing && tape.deactivate_display)
14528       TapeDeactivateDisplayOn();
14529   }
14530 }
14531
14532 void RequestQuitGame(boolean ask_if_really_quit)
14533 {
14534   boolean quick_quit = (!ask_if_really_quit || level_editor_test_game);
14535   boolean skip_request = AllPlayersGone || quick_quit;
14536
14537   RequestQuitGameExt(skip_request, quick_quit,
14538                      "Do you really want to quit the game?");
14539 }
14540
14541
14542 /* ------------------------------------------------------------------------- */
14543 /* random generator functions                                                */
14544 /* ------------------------------------------------------------------------- */
14545
14546 unsigned int InitEngineRandom_RND(int seed)
14547 {
14548   game.num_random_calls = 0;
14549
14550   return InitEngineRandom(seed);
14551 }
14552
14553 unsigned int RND(int max)
14554 {
14555   if (max > 0)
14556   {
14557     game.num_random_calls++;
14558
14559     return GetEngineRandom(max);
14560   }
14561
14562   return 0;
14563 }
14564
14565
14566 /* ------------------------------------------------------------------------- */
14567 /* game engine snapshot handling functions                                   */
14568 /* ------------------------------------------------------------------------- */
14569
14570 struct EngineSnapshotInfo
14571 {
14572   /* runtime values for custom element collect score */
14573   int collect_score[NUM_CUSTOM_ELEMENTS];
14574
14575   /* runtime values for group element choice position */
14576   int choice_pos[NUM_GROUP_ELEMENTS];
14577
14578   /* runtime values for belt position animations */
14579   int belt_graphic[4][NUM_BELT_PARTS];
14580   int belt_anim_mode[4][NUM_BELT_PARTS];
14581 };
14582
14583 static struct EngineSnapshotInfo engine_snapshot_rnd;
14584 static char *snapshot_level_identifier = NULL;
14585 static int snapshot_level_nr = -1;
14586
14587 static void SaveEngineSnapshotValues_RND()
14588 {
14589   static int belt_base_active_element[4] =
14590   {
14591     EL_CONVEYOR_BELT_1_LEFT_ACTIVE,
14592     EL_CONVEYOR_BELT_2_LEFT_ACTIVE,
14593     EL_CONVEYOR_BELT_3_LEFT_ACTIVE,
14594     EL_CONVEYOR_BELT_4_LEFT_ACTIVE
14595   };
14596   int i, j;
14597
14598   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
14599   {
14600     int element = EL_CUSTOM_START + i;
14601
14602     engine_snapshot_rnd.collect_score[i] = element_info[element].collect_score;
14603   }
14604
14605   for (i = 0; i < NUM_GROUP_ELEMENTS; i++)
14606   {
14607     int element = EL_GROUP_START + i;
14608
14609     engine_snapshot_rnd.choice_pos[i] = element_info[element].group->choice_pos;
14610   }
14611
14612   for (i = 0; i < 4; i++)
14613   {
14614     for (j = 0; j < NUM_BELT_PARTS; j++)
14615     {
14616       int element = belt_base_active_element[i] + j;
14617       int graphic = el2img(element);
14618       int anim_mode = graphic_info[graphic].anim_mode;
14619
14620       engine_snapshot_rnd.belt_graphic[i][j] = graphic;
14621       engine_snapshot_rnd.belt_anim_mode[i][j] = anim_mode;
14622     }
14623   }
14624 }
14625
14626 static void LoadEngineSnapshotValues_RND()
14627 {
14628   unsigned int num_random_calls = game.num_random_calls;
14629   int i, j;
14630
14631   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
14632   {
14633     int element = EL_CUSTOM_START + i;
14634
14635     element_info[element].collect_score = engine_snapshot_rnd.collect_score[i];
14636   }
14637
14638   for (i = 0; i < NUM_GROUP_ELEMENTS; i++)
14639   {
14640     int element = EL_GROUP_START + i;
14641
14642     element_info[element].group->choice_pos = engine_snapshot_rnd.choice_pos[i];
14643   }
14644
14645   for (i = 0; i < 4; i++)
14646   {
14647     for (j = 0; j < NUM_BELT_PARTS; j++)
14648     {
14649       int graphic = engine_snapshot_rnd.belt_graphic[i][j];
14650       int anim_mode = engine_snapshot_rnd.belt_anim_mode[i][j];
14651
14652       graphic_info[graphic].anim_mode = anim_mode;
14653     }
14654   }
14655
14656   if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
14657   {
14658     InitRND(tape.random_seed);
14659     for (i = 0; i < num_random_calls; i++)
14660       RND(1);
14661   }
14662
14663   if (game.num_random_calls != num_random_calls)
14664   {
14665     Error(ERR_INFO, "number of random calls out of sync");
14666     Error(ERR_INFO, "number of random calls should be %d", num_random_calls);
14667     Error(ERR_INFO, "number of random calls is %d", game.num_random_calls);
14668     Error(ERR_EXIT, "this should not happen -- please debug");
14669   }
14670 }
14671
14672 void FreeEngineSnapshotSingle()
14673 {
14674   FreeSnapshotSingle();
14675
14676   setString(&snapshot_level_identifier, NULL);
14677   snapshot_level_nr = -1;
14678 }
14679
14680 void FreeEngineSnapshotList()
14681 {
14682   FreeSnapshotList();
14683 }
14684
14685 ListNode *SaveEngineSnapshotBuffers()
14686 {
14687   ListNode *buffers = NULL;
14688
14689   /* copy some special values to a structure better suited for the snapshot */
14690
14691   if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
14692     SaveEngineSnapshotValues_RND();
14693   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
14694     SaveEngineSnapshotValues_EM();
14695   if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
14696     SaveEngineSnapshotValues_SP(&buffers);
14697
14698   /* save values stored in special snapshot structure */
14699
14700   if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
14701     SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(engine_snapshot_rnd));
14702   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
14703     SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(engine_snapshot_em));
14704   if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
14705     SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(engine_snapshot_sp));
14706
14707   /* save further RND engine values */
14708
14709   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(stored_player));
14710   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(game));
14711   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(tape));
14712
14713   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ZX));
14714   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ZY));
14715   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ExitX));
14716   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ExitY));
14717
14718   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(FrameCounter));
14719   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(TimeFrames));
14720   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(TimePlayed));
14721   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(TimeLeft));
14722   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(TapeTime));
14723
14724   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ScreenMovDir));
14725   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ScreenMovPos));
14726   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ScreenGfxPos));
14727
14728   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ScrollStepSize));
14729
14730   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(AllPlayersGone));
14731
14732   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(AmoebaCnt));
14733   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(AmoebaCnt2));
14734
14735   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Feld));
14736   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(MovPos));
14737   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(MovDir));
14738   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(MovDelay));
14739   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ChangeDelay));
14740   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ChangePage));
14741   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(CustomValue));
14742   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Store));
14743   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Store2));
14744   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(StorePlayer));
14745   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Back));
14746   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(AmoebaNr));
14747   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(WasJustMoving));
14748   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(WasJustFalling));
14749   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(CheckCollision));
14750   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(CheckImpact));
14751   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Stop));
14752   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(Pushed));
14753
14754   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ChangeCount));
14755   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ChangeEvent));
14756
14757   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ExplodePhase));
14758   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ExplodeDelay));
14759   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(ExplodeField));
14760
14761   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(RunnerVisit));
14762   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(PlayerVisit));
14763
14764   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxFrame));
14765   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxRandom));
14766   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxElement));
14767   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxAction));
14768   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(GfxDir));
14769
14770   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(scroll_x));
14771   SaveSnapshotBuffer(&buffers, ARGS_ADDRESS_AND_SIZEOF(scroll_y));
14772
14773 #if 0
14774   ListNode *node = engine_snapshot_list_rnd;
14775   int num_bytes = 0;
14776
14777   while (node != NULL)
14778   {
14779     num_bytes += ((struct EngineSnapshotNodeInfo *)node->content)->size;
14780
14781     node = node->next;
14782   }
14783
14784   printf("::: size of engine snapshot: %d bytes\n", num_bytes);
14785 #endif
14786
14787   return buffers;
14788 }
14789
14790 void SaveEngineSnapshotSingle()
14791 {
14792   ListNode *buffers = SaveEngineSnapshotBuffers();
14793
14794   /* finally save all snapshot buffers to single snapshot */
14795   SaveSnapshotSingle(buffers);
14796
14797   /* save level identification information */
14798   setString(&snapshot_level_identifier, leveldir_current->identifier);
14799   snapshot_level_nr = level_nr;
14800 }
14801
14802 boolean CheckSaveEngineSnapshotToList()
14803 {
14804   boolean save_snapshot =
14805     ((game.snapshot.mode == SNAPSHOT_MODE_EVERY_STEP) ||
14806      (game.snapshot.mode == SNAPSHOT_MODE_EVERY_MOVE &&
14807       game.snapshot.changed_action) ||
14808      (game.snapshot.mode == SNAPSHOT_MODE_EVERY_COLLECT &&
14809       game.snapshot.collected_item));
14810
14811   game.snapshot.changed_action = FALSE;
14812   game.snapshot.collected_item = FALSE;
14813   game.snapshot.save_snapshot = save_snapshot;
14814
14815   return save_snapshot;
14816 }
14817
14818 void SaveEngineSnapshotToList()
14819 {
14820   if (game.snapshot.mode == SNAPSHOT_MODE_OFF ||
14821       tape.quick_resume)
14822     return;
14823
14824   ListNode *buffers = SaveEngineSnapshotBuffers();
14825
14826   /* finally save all snapshot buffers to snapshot list */
14827   SaveSnapshotToList(buffers);
14828 }
14829
14830 void SaveEngineSnapshotToListInitial()
14831 {
14832   FreeEngineSnapshotList();
14833
14834   SaveEngineSnapshotToList();
14835 }
14836
14837 void LoadEngineSnapshotValues()
14838 {
14839   /* restore special values from snapshot structure */
14840
14841   if (level.game_engine_type == GAME_ENGINE_TYPE_RND)
14842     LoadEngineSnapshotValues_RND();
14843   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
14844     LoadEngineSnapshotValues_EM();
14845   if (level.game_engine_type == GAME_ENGINE_TYPE_SP)
14846     LoadEngineSnapshotValues_SP();
14847 }
14848
14849 void LoadEngineSnapshotSingle()
14850 {
14851   LoadSnapshotSingle();
14852
14853   LoadEngineSnapshotValues();
14854 }
14855
14856 void LoadEngineSnapshot_Undo(int steps)
14857 {
14858   LoadSnapshotFromList_Older(steps);
14859
14860   LoadEngineSnapshotValues();
14861 }
14862
14863 void LoadEngineSnapshot_Redo(int steps)
14864 {
14865   LoadSnapshotFromList_Newer(steps);
14866
14867   LoadEngineSnapshotValues();
14868 }
14869
14870 boolean CheckEngineSnapshotSingle()
14871 {
14872   return (strEqual(snapshot_level_identifier, leveldir_current->identifier) &&
14873           snapshot_level_nr == level_nr);
14874 }
14875
14876 boolean CheckEngineSnapshotList()
14877 {
14878   return CheckSnapshotList();
14879 }
14880
14881
14882 /* ---------- new game button stuff ---------------------------------------- */
14883
14884 static struct
14885 {
14886   int graphic;
14887   struct XY *pos;
14888   int gadget_id;
14889   char *infotext;
14890 } gamebutton_info[NUM_GAME_BUTTONS] =
14891 {
14892   {
14893     IMG_GFX_GAME_BUTTON_STOP,           &game.button.stop,
14894     GAME_CTRL_ID_STOP,                  "stop game"
14895   },
14896   {
14897     IMG_GFX_GAME_BUTTON_PAUSE,          &game.button.pause,
14898     GAME_CTRL_ID_PAUSE,                 "pause game"
14899   },
14900   {
14901     IMG_GFX_GAME_BUTTON_PLAY,           &game.button.play,
14902     GAME_CTRL_ID_PLAY,                  "play game"
14903   },
14904   {
14905     IMG_GFX_GAME_BUTTON_UNDO,           &game.button.undo,
14906     GAME_CTRL_ID_UNDO,                  "undo step"
14907   },
14908   {
14909     IMG_GFX_GAME_BUTTON_REDO,           &game.button.redo,
14910     GAME_CTRL_ID_REDO,                  "redo step"
14911   },
14912   {
14913     IMG_GFX_GAME_BUTTON_SAVE,           &game.button.save,
14914     GAME_CTRL_ID_SAVE,                  "save game"
14915   },
14916   {
14917     IMG_GFX_GAME_BUTTON_PAUSE2,         &game.button.pause2,
14918     GAME_CTRL_ID_PAUSE2,                "pause game"
14919   },
14920   {
14921     IMG_GFX_GAME_BUTTON_LOAD,           &game.button.load,
14922     GAME_CTRL_ID_LOAD,                  "load game"
14923   },
14924   {
14925     IMG_GFX_GAME_BUTTON_SOUND_MUSIC,    &game.button.sound_music,
14926     SOUND_CTRL_ID_MUSIC,                "background music on/off"
14927   },
14928   {
14929     IMG_GFX_GAME_BUTTON_SOUND_LOOPS,    &game.button.sound_loops,
14930     SOUND_CTRL_ID_LOOPS,                "sound loops on/off"
14931   },
14932   {
14933     IMG_GFX_GAME_BUTTON_SOUND_SIMPLE,   &game.button.sound_simple,
14934     SOUND_CTRL_ID_SIMPLE,               "normal sounds on/off"
14935   }
14936 };
14937
14938 void CreateGameButtons()
14939 {
14940   int i;
14941
14942   for (i = 0; i < NUM_GAME_BUTTONS; i++)
14943   {
14944     struct GraphicInfo *gfx = &graphic_info[gamebutton_info[i].graphic];
14945     struct XY *pos = gamebutton_info[i].pos;
14946     struct GadgetInfo *gi;
14947     int button_type;
14948     boolean checked;
14949     unsigned int event_mask;
14950     int base_x = (tape.show_game_buttons ? VX : DX);
14951     int base_y = (tape.show_game_buttons ? VY : DY);
14952     int gd_x   = gfx->src_x;
14953     int gd_y   = gfx->src_y;
14954     int gd_xp  = gfx->src_x + gfx->pressed_xoffset;
14955     int gd_yp  = gfx->src_y + gfx->pressed_yoffset;
14956     int gd_xa  = gfx->src_x + gfx->active_xoffset;
14957     int gd_ya  = gfx->src_y + gfx->active_yoffset;
14958     int gd_xap = gfx->src_x + gfx->active_xoffset + gfx->pressed_xoffset;
14959     int gd_yap = gfx->src_y + gfx->active_yoffset + gfx->pressed_yoffset;
14960     int id = i;
14961
14962     if (gfx->bitmap == NULL)
14963     {
14964       game_gadget[id] = NULL;
14965
14966       continue;
14967     }
14968
14969     if (id == GAME_CTRL_ID_STOP ||
14970         id == GAME_CTRL_ID_PLAY ||
14971         id == GAME_CTRL_ID_SAVE ||
14972         id == GAME_CTRL_ID_LOAD)
14973     {
14974       button_type = GD_TYPE_NORMAL_BUTTON;
14975       checked = FALSE;
14976       event_mask = GD_EVENT_RELEASED;
14977     }
14978     else if (id == GAME_CTRL_ID_UNDO ||
14979              id == GAME_CTRL_ID_REDO)
14980     {
14981       button_type = GD_TYPE_NORMAL_BUTTON;
14982       checked = FALSE;
14983       event_mask = GD_EVENT_PRESSED | GD_EVENT_REPEATED;
14984     }
14985     else
14986     {
14987       button_type = GD_TYPE_CHECK_BUTTON;
14988       checked =
14989         ((id == SOUND_CTRL_ID_MUSIC && setup.sound_music) ||
14990          (id == SOUND_CTRL_ID_LOOPS && setup.sound_loops) ||
14991          (id == SOUND_CTRL_ID_SIMPLE && setup.sound_simple) ? TRUE : FALSE);
14992       event_mask = GD_EVENT_PRESSED;
14993     }
14994
14995     gi = CreateGadget(GDI_CUSTOM_ID, id,
14996                       GDI_INFO_TEXT, gamebutton_info[i].infotext,
14997                       GDI_X, base_x + GDI_ACTIVE_POS(pos->x),
14998                       GDI_Y, base_y + GDI_ACTIVE_POS(pos->y),
14999                       GDI_WIDTH, gfx->width,
15000                       GDI_HEIGHT, gfx->height,
15001                       GDI_TYPE, button_type,
15002                       GDI_STATE, GD_BUTTON_UNPRESSED,
15003                       GDI_CHECKED, checked,
15004                       GDI_DESIGN_UNPRESSED, gfx->bitmap, gd_x, gd_y,
15005                       GDI_DESIGN_PRESSED, gfx->bitmap, gd_xp, gd_yp,
15006                       GDI_ALT_DESIGN_UNPRESSED, gfx->bitmap, gd_xa, gd_ya,
15007                       GDI_ALT_DESIGN_PRESSED, gfx->bitmap, gd_xap, gd_yap,
15008                       GDI_DIRECT_DRAW, FALSE,
15009                       GDI_EVENT_MASK, event_mask,
15010                       GDI_CALLBACK_ACTION, HandleGameButtons,
15011                       GDI_END);
15012
15013     if (gi == NULL)
15014       Error(ERR_EXIT, "cannot create gadget");
15015
15016     game_gadget[id] = gi;
15017   }
15018 }
15019
15020 void FreeGameButtons()
15021 {
15022   int i;
15023
15024   for (i = 0; i < NUM_GAME_BUTTONS; i++)
15025     FreeGadget(game_gadget[i]);
15026 }
15027
15028 static void UnmapGameButtonsAtSamePosition(int id)
15029 {
15030   int i;
15031
15032   for (i = 0; i < NUM_GAME_BUTTONS; i++)
15033     if (i != id &&
15034         gamebutton_info[i].pos->x == gamebutton_info[id].pos->x &&
15035         gamebutton_info[i].pos->y == gamebutton_info[id].pos->y)
15036       UnmapGadget(game_gadget[i]);
15037 }
15038
15039 static void UnmapGameButtonsAtSamePosition_All()
15040 {
15041   if (setup.show_snapshot_buttons)
15042   {
15043     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_SAVE);
15044     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PAUSE2);
15045     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_LOAD);
15046   }
15047   else
15048   {
15049     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_STOP);
15050     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PAUSE);
15051     UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_PLAY);
15052   }
15053 }
15054
15055 static void MapGameButtonsAtSamePosition(int id)
15056 {
15057   int i;
15058
15059   for (i = 0; i < NUM_GAME_BUTTONS; i++)
15060     if (i != id &&
15061         gamebutton_info[i].pos->x == gamebutton_info[id].pos->x &&
15062         gamebutton_info[i].pos->y == gamebutton_info[id].pos->y)
15063       MapGadget(game_gadget[i]);
15064
15065   UnmapGameButtonsAtSamePosition_All();
15066 }
15067
15068 void MapUndoRedoButtons()
15069 {
15070   UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_UNDO);
15071   UnmapGameButtonsAtSamePosition(GAME_CTRL_ID_REDO);
15072
15073   MapGadget(game_gadget[GAME_CTRL_ID_UNDO]);
15074   MapGadget(game_gadget[GAME_CTRL_ID_REDO]);
15075
15076   ModifyGadget(game_gadget[GAME_CTRL_ID_PAUSE2], GDI_CHECKED, TRUE, GDI_END);
15077 }
15078
15079 void UnmapUndoRedoButtons()
15080 {
15081   UnmapGadget(game_gadget[GAME_CTRL_ID_UNDO]);
15082   UnmapGadget(game_gadget[GAME_CTRL_ID_REDO]);
15083
15084   MapGameButtonsAtSamePosition(GAME_CTRL_ID_UNDO);
15085   MapGameButtonsAtSamePosition(GAME_CTRL_ID_REDO);
15086
15087   ModifyGadget(game_gadget[GAME_CTRL_ID_PAUSE2], GDI_CHECKED, FALSE, GDI_END);
15088 }
15089
15090 void MapGameButtons()
15091 {
15092   int i;
15093
15094   for (i = 0; i < NUM_GAME_BUTTONS; i++)
15095     if (i != GAME_CTRL_ID_UNDO &&
15096         i != GAME_CTRL_ID_REDO)
15097       MapGadget(game_gadget[i]);
15098
15099   UnmapGameButtonsAtSamePosition_All();
15100
15101   RedrawGameButtons();
15102 }
15103
15104 void UnmapGameButtons()
15105 {
15106   int i;
15107
15108   for (i = 0; i < NUM_GAME_BUTTONS; i++)
15109     UnmapGadget(game_gadget[i]);
15110 }
15111
15112 void RedrawGameButtons()
15113 {
15114   int i;
15115
15116   for (i = 0; i < NUM_GAME_BUTTONS; i++)
15117     RedrawGadget(game_gadget[i]);
15118
15119   // RedrawGadget() may have set REDRAW_ALL if buttons are defined off-area
15120   redraw_mask &= ~REDRAW_ALL;
15121 }
15122
15123 void GameUndoRedoExt()
15124 {
15125   ClearPlayerAction();
15126
15127   tape.pausing = TRUE;
15128
15129   RedrawPlayfield();
15130   UpdateAndDisplayGameControlValues();
15131
15132   DrawCompleteVideoDisplay();
15133   DrawVideoDisplay(VIDEO_STATE_TIME_ON, TapeTime);
15134   DrawVideoDisplay(VIDEO_STATE_FRAME_ON, FrameCounter);
15135   DrawVideoDisplay(VIDEO_STATE_1STEP(tape.single_step), 0);
15136
15137   BackToFront();
15138 }
15139
15140 void GameUndo(int steps)
15141 {
15142   if (!CheckEngineSnapshotList())
15143     return;
15144
15145   LoadEngineSnapshot_Undo(steps);
15146
15147   GameUndoRedoExt();
15148 }
15149
15150 void GameRedo(int steps)
15151 {
15152   if (!CheckEngineSnapshotList())
15153     return;
15154
15155   LoadEngineSnapshot_Redo(steps);
15156
15157   GameUndoRedoExt();
15158 }
15159
15160 static void HandleGameButtonsExt(int id, int button)
15161 {
15162   static boolean game_undo_executed = FALSE;
15163   int steps = BUTTON_STEPSIZE(button);
15164   boolean handle_game_buttons =
15165     (game_status == GAME_MODE_PLAYING ||
15166      (game_status == GAME_MODE_MAIN && tape.show_game_buttons));
15167
15168   if (!handle_game_buttons)
15169     return;
15170
15171   switch (id)
15172   {
15173     case GAME_CTRL_ID_STOP:
15174       if (game_status == GAME_MODE_MAIN)
15175         break;
15176
15177       if (tape.playing)
15178         TapeStop();
15179       else
15180         RequestQuitGame(TRUE);
15181
15182       break;
15183
15184     case GAME_CTRL_ID_PAUSE:
15185     case GAME_CTRL_ID_PAUSE2:
15186       if (options.network && game_status == GAME_MODE_PLAYING)
15187       {
15188 #if defined(NETWORK_AVALIABLE)
15189         if (tape.pausing)
15190           SendToServer_ContinuePlaying();
15191         else
15192           SendToServer_PausePlaying();
15193 #endif
15194       }
15195       else
15196         TapeTogglePause(TAPE_TOGGLE_MANUAL);
15197
15198       game_undo_executed = FALSE;
15199
15200       break;
15201
15202     case GAME_CTRL_ID_PLAY:
15203       if (game_status == GAME_MODE_MAIN)
15204       {
15205         StartGameActions(options.network, setup.autorecord, level.random_seed);
15206       }
15207       else if (tape.pausing)
15208       {
15209 #if defined(NETWORK_AVALIABLE)
15210         if (options.network)
15211           SendToServer_ContinuePlaying();
15212         else
15213 #endif
15214           TapeTogglePause(TAPE_TOGGLE_MANUAL | TAPE_TOGGLE_PLAY_PAUSE);
15215       }
15216       break;
15217
15218     case GAME_CTRL_ID_UNDO:
15219       // Important: When using "save snapshot when collecting an item" mode,
15220       // load last (current) snapshot for first "undo" after pressing "pause"
15221       // (else the last-but-one snapshot would be loaded, because the snapshot
15222       // pointer already points to the last snapshot when pressing "pause",
15223       // which is fine for "every step/move" mode, but not for "every collect")
15224       if (game.snapshot.mode == SNAPSHOT_MODE_EVERY_COLLECT &&
15225           !game_undo_executed)
15226         steps--;
15227
15228       game_undo_executed = TRUE;
15229
15230       GameUndo(steps);
15231       break;
15232
15233     case GAME_CTRL_ID_REDO:
15234       GameRedo(steps);
15235       break;
15236
15237     case GAME_CTRL_ID_SAVE:
15238       TapeQuickSave();
15239       break;
15240
15241     case GAME_CTRL_ID_LOAD:
15242       TapeQuickLoad();
15243       break;
15244
15245     case SOUND_CTRL_ID_MUSIC:
15246       if (setup.sound_music)
15247       {
15248         setup.sound_music = FALSE;
15249
15250         FadeMusic();
15251       }
15252       else if (audio.music_available)
15253       {
15254         setup.sound = setup.sound_music = TRUE;
15255
15256         SetAudioMode(setup.sound);
15257
15258         PlayLevelMusic();
15259       }
15260       break;
15261
15262     case SOUND_CTRL_ID_LOOPS:
15263       if (setup.sound_loops)
15264         setup.sound_loops = FALSE;
15265       else if (audio.loops_available)
15266       {
15267         setup.sound = setup.sound_loops = TRUE;
15268
15269         SetAudioMode(setup.sound);
15270       }
15271       break;
15272
15273     case SOUND_CTRL_ID_SIMPLE:
15274       if (setup.sound_simple)
15275         setup.sound_simple = FALSE;
15276       else if (audio.sound_available)
15277       {
15278         setup.sound = setup.sound_simple = TRUE;
15279
15280         SetAudioMode(setup.sound);
15281       }
15282       break;
15283
15284     default:
15285       break;
15286   }
15287 }
15288
15289 static void HandleGameButtons(struct GadgetInfo *gi)
15290 {
15291   HandleGameButtonsExt(gi->custom_id, gi->event.button);
15292 }
15293
15294 void HandleSoundButtonKeys(Key key)
15295 {
15296
15297   if (key == setup.shortcut.sound_simple)
15298     ClickOnGadget(game_gadget[SOUND_CTRL_ID_SIMPLE], MB_LEFTBUTTON);
15299   else if (key == setup.shortcut.sound_loops)
15300     ClickOnGadget(game_gadget[SOUND_CTRL_ID_LOOPS], MB_LEFTBUTTON);
15301   else if (key == setup.shortcut.sound_music)
15302     ClickOnGadget(game_gadget[SOUND_CTRL_ID_MUSIC], MB_LEFTBUTTON);
15303 }