OpenTTD
newgrf_house.cpp
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1 /* $Id: newgrf_house.cpp 26580 2014-05-11 18:02:11Z rubidium $ */
2 
3 /*
4  * This file is part of OpenTTD.
5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
6  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
8  */
9 
12 #include "stdafx.h"
13 #include "debug.h"
14 #include "landscape.h"
15 #include "newgrf_house.h"
16 #include "newgrf_spritegroup.h"
17 #include "newgrf_town.h"
18 #include "newgrf_sound.h"
19 #include "company_func.h"
20 #include "company_base.h"
21 #include "town.h"
22 #include "genworld.h"
23 #include "newgrf_animation_base.h"
24 #include "newgrf_cargo.h"
25 #include "station_base.h"
26 
27 #include "safeguards.h"
28 
29 static BuildingCounts<uint32> _building_counts;
30 static HouseClassMapping _class_mapping[HOUSE_CLASS_MAX];
31 
32 HouseOverrideManager _house_mngr(NEW_HOUSE_OFFSET, NUM_HOUSES, INVALID_HOUSE_ID);
33 
45  bool not_yet_constructed, uint8 initial_random_bits, uint32 watched_cargo_triggers)
46  : ScopeResolver(ro)
47 {
48  this->house_id = house_id;
49  this->tile = tile;
50  this->town = town;
51  this->not_yet_constructed = not_yet_constructed;
52  this->initial_random_bits = initial_random_bits;
53  this->watched_cargo_triggers = watched_cargo_triggers;
54 }
55 
61 static const GRFFile *GetHouseSpecGrf(HouseID house_id)
62 {
63  const HouseSpec *hs = HouseSpec::Get(house_id);
64  return (hs != NULL) ? hs->grf_prop.grffile : NULL;
65 }
66 
80  CallbackID callback, uint32 param1, uint32 param2,
81  bool not_yet_constructed, uint8 initial_random_bits, uint32 watched_cargo_triggers)
82  : ResolverObject(GetHouseSpecGrf(house_id), callback, param1, param2),
83  house_scope(*this, house_id, tile, town, not_yet_constructed, initial_random_bits, watched_cargo_triggers),
84  town_scope(*this, town, not_yet_constructed) // Don't access StorePSA if house is not yet constructed.
85 {
86  this->root_spritegroup = HouseSpec::Get(house_id)->grf_prop.spritegroup[0];
87 }
88 
89 HouseClassID AllocateHouseClassID(byte grf_class_id, uint32 grfid)
90 {
91  /* Start from 1 because 0 means that no class has been assigned. */
92  for (int i = 1; i != lengthof(_class_mapping); i++) {
93  HouseClassMapping *map = &_class_mapping[i];
94 
95  if (map->class_id == grf_class_id && map->grfid == grfid) return (HouseClassID)i;
96 
97  if (map->class_id == 0 && map->grfid == 0) {
98  map->class_id = grf_class_id;
99  map->grfid = grfid;
100  return (HouseClassID)i;
101  }
102  }
103  return HOUSE_NO_CLASS;
104 }
105 
106 void InitializeBuildingCounts()
107 {
108  memset(&_building_counts, 0, sizeof(_building_counts));
109 
110  Town *t;
111  FOR_ALL_TOWNS(t) {
112  memset(&t->cache.building_counts, 0, sizeof(t->cache.building_counts));
113  }
114 }
115 
123 {
124  HouseClassID class_id = HouseSpec::Get(house_id)->class_id;
125 
127 
128  t->cache.building_counts.id_count[house_id]++;
129  _building_counts.id_count[house_id]++;
130 
131  if (class_id == HOUSE_NO_CLASS) return;
132 
133  t->cache.building_counts.class_count[class_id]++;
134  _building_counts.class_count[class_id]++;
135 }
136 
144 {
145  HouseClassID class_id = HouseSpec::Get(house_id)->class_id;
146 
148 
149  if (t->cache.building_counts.id_count[house_id] > 0) t->cache.building_counts.id_count[house_id]--;
150  if (_building_counts.id_count[house_id] > 0) _building_counts.id_count[house_id]--;
151 
152  if (class_id == HOUSE_NO_CLASS) return;
153 
154  if (t->cache.building_counts.class_count[class_id] > 0) t->cache.building_counts.class_count[class_id]--;
155  if (_building_counts.class_count[class_id] > 0) _building_counts.class_count[class_id]--;
156 }
157 
158 /* virtual */ uint32 HouseScopeResolver::GetRandomBits() const
159 {
160  /* Note: Towns build houses over houses. So during construction checks 'tile' may be a valid but unrelated house. */
161  assert(IsValidTile(this->tile) && (this->not_yet_constructed || IsTileType(this->tile, MP_HOUSE)));
162  return this->not_yet_constructed ? this->initial_random_bits : GetHouseRandomBits(this->tile);
163 }
164 
165 /* virtual */ uint32 HouseScopeResolver::GetTriggers() const
166 {
167  /* Note: Towns build houses over houses. So during construction checks 'tile' may be a valid but unrelated house. */
168  assert(IsValidTile(this->tile) && (this->not_yet_constructed || IsTileType(this->tile, MP_HOUSE)));
169  return this->not_yet_constructed ? 0 : GetHouseTriggers(this->tile);
170 }
171 
172 /* virtual */ void HouseScopeResolver::SetTriggers(int triggers) const
173 {
174  assert(!this->not_yet_constructed && IsValidTile(this->tile) && IsTileType(this->tile, MP_HOUSE));
175  SetHouseTriggers(this->tile, triggers);
176 }
177 
178 static uint32 GetNumHouses(HouseID house_id, const Town *town)
179 {
180  uint8 map_id_count, town_id_count, map_class_count, town_class_count;
181  HouseClassID class_id = HouseSpec::Get(house_id)->class_id;
182 
183  map_id_count = ClampU(_building_counts.id_count[house_id], 0, 255);
184  map_class_count = ClampU(_building_counts.class_count[class_id], 0, 255);
185  town_id_count = ClampU(town->cache.building_counts.id_count[house_id], 0, 255);
186  town_class_count = ClampU(town->cache.building_counts.class_count[class_id], 0, 255);
187 
188  return map_class_count << 24 | town_class_count << 16 | map_id_count << 8 | town_id_count;
189 }
190 
198 static uint32 GetNearbyTileInformation(byte parameter, TileIndex tile, bool grf_version8)
199 {
200  tile = GetNearbyTile(parameter, tile);
201  return GetNearbyTileInformation(tile, grf_version8);
202 }
203 
206  const HouseSpec *hs;
208 };
209 
216 static bool SearchNearbyHouseID(TileIndex tile, void *user_data)
217 {
218  if (IsTileType(tile, MP_HOUSE)) {
219  HouseID house = GetHouseType(tile); // tile been examined
220  const HouseSpec *hs = HouseSpec::Get(house);
221  if (hs->grf_prop.grffile != NULL) { // must be one from a grf file
222  SearchNearbyHouseData *nbhd = (SearchNearbyHouseData *)user_data;
223 
224  TileIndex north_tile = tile + GetHouseNorthPart(house); // modifies 'house'!
225  if (north_tile == nbhd->north_tile) return false; // Always ignore origin house
226 
227  return hs->grf_prop.local_id == nbhd->hs->grf_prop.local_id && // same local id as the one requested
228  hs->grf_prop.grffile->grfid == nbhd->hs->grf_prop.grffile->grfid; // from the same grf
229  }
230  }
231  return false;
232 }
233 
240 static bool SearchNearbyHouseClass(TileIndex tile, void *user_data)
241 {
242  if (IsTileType(tile, MP_HOUSE)) {
243  HouseID house = GetHouseType(tile); // tile been examined
244  const HouseSpec *hs = HouseSpec::Get(house);
245  if (hs->grf_prop.grffile != NULL) { // must be one from a grf file
246  SearchNearbyHouseData *nbhd = (SearchNearbyHouseData *)user_data;
247 
248  TileIndex north_tile = tile + GetHouseNorthPart(house); // modifies 'house'!
249  if (north_tile == nbhd->north_tile) return false; // Always ignore origin house
250 
251  return hs->class_id == nbhd->hs->class_id && // same classid as the one requested
252  hs->grf_prop.grffile->grfid == nbhd->hs->grf_prop.grffile->grfid; // from the same grf
253  }
254  }
255  return false;
256 }
257 
264 static bool SearchNearbyHouseGRFID(TileIndex tile, void *user_data)
265 {
266  if (IsTileType(tile, MP_HOUSE)) {
267  HouseID house = GetHouseType(tile); // tile been examined
268  const HouseSpec *hs = HouseSpec::Get(house);
269  if (hs->grf_prop.grffile != NULL) { // must be one from a grf file
270  SearchNearbyHouseData *nbhd = (SearchNearbyHouseData *)user_data;
271 
272  TileIndex north_tile = tile + GetHouseNorthPart(house); // modifies 'house'!
273  if (north_tile == nbhd->north_tile) return false; // Always ignore origin house
274 
275  return hs->grf_prop.grffile->grfid == nbhd->hs->grf_prop.grffile->grfid; // from the same grf
276  }
277  }
278  return false;
279 }
280 
291 static uint32 GetDistanceFromNearbyHouse(uint8 parameter, TileIndex tile, HouseID house)
292 {
293  static TestTileOnSearchProc * const search_procs[3] = {
297  };
298  TileIndex found_tile = tile;
299  uint8 searchtype = GB(parameter, 6, 2);
300  uint8 searchradius = GB(parameter, 0, 6);
301  if (searchtype >= lengthof(search_procs)) return 0; // do not run on ill-defined code
302  if (searchradius < 1) return 0; // do not use a too low radius
303 
305  nbhd.hs = HouseSpec::Get(house);
306  nbhd.north_tile = tile + GetHouseNorthPart(house); // modifies 'house'!
307 
308  /* Use a pointer for the tile to start the search. Will be required for calculating the distance*/
309  if (CircularTileSearch(&found_tile, 2 * searchradius + 1, search_procs[searchtype], &nbhd)) {
310  return DistanceManhattan(found_tile, tile);
311  }
312  return 0;
313 }
314 
318 /* virtual */ uint32 HouseScopeResolver::GetVariable(byte variable, uint32 parameter, bool *available) const
319 {
320  switch (variable) {
321  /* Construction stage. */
322  case 0x40: return (IsTileType(this->tile, MP_HOUSE) ? GetHouseBuildingStage(this->tile) : 0) | TileHash2Bit(TileX(this->tile), TileY(this->tile)) << 2;
323 
324  /* Building age. */
325  case 0x41: return IsTileType(this->tile, MP_HOUSE) ? GetHouseAge(this->tile) : 0;
326 
327  /* Town zone */
328  case 0x42: return GetTownRadiusGroup(this->town, this->tile);
329 
330  /* Terrain type */
331  case 0x43: return GetTerrainType(this->tile);
332 
333  /* Number of this type of building on the map. */
334  case 0x44: return GetNumHouses(this->house_id, this->town);
335 
336  /* Whether the town is being created or just expanded. */
337  case 0x45: return _generating_world ? 1 : 0;
338 
339  /* Current animation frame. */
340  case 0x46: return IsTileType(this->tile, MP_HOUSE) ? GetAnimationFrame(this->tile) : 0;
341 
342  /* Position of the house */
343  case 0x47: return TileY(this->tile) << 16 | TileX(this->tile);
344 
345  /* Building counts for old houses with id = parameter. */
346  case 0x60: return parameter < NEW_HOUSE_OFFSET ? GetNumHouses(parameter, this->town) : 0;
347 
348  /* Building counts for new houses with id = parameter. */
349  case 0x61: {
350  const HouseSpec *hs = HouseSpec::Get(this->house_id);
351  if (hs->grf_prop.grffile == NULL) return 0;
352 
353  HouseID new_house = _house_mngr.GetID(parameter, hs->grf_prop.grffile->grfid);
354  return new_house == INVALID_HOUSE_ID ? 0 : GetNumHouses(new_house, this->town);
355  }
356 
357  /* Land info for nearby tiles. */
358  case 0x62: return GetNearbyTileInformation(parameter, this->tile, this->ro.grffile->grf_version >= 8);
359 
360  /* Current animation frame of nearby house tiles */
361  case 0x63: {
362  TileIndex testtile = GetNearbyTile(parameter, this->tile);
363  return IsTileType(testtile, MP_HOUSE) ? GetAnimationFrame(testtile) : 0;
364  }
365 
366  /* Cargo acceptance history of nearby stations */
367  case 0x64: {
368  CargoID cid = GetCargoTranslation(parameter, this->ro.grffile);
369  if (cid == CT_INVALID) return 0;
370 
371  /* Extract tile offset. */
372  int8 x_offs = GB(GetRegister(0x100), 0, 8);
373  int8 y_offs = GB(GetRegister(0x100), 8, 8);
374  TileIndex testtile = TILE_MASK(this->tile + TileDiffXY(x_offs, y_offs));
375 
376  StationFinder stations(TileArea(testtile, 1, 1));
377  const StationList *sl = stations.GetStations();
378 
379  /* Collect acceptance stats. */
380  uint32 res = 0;
381  for (Station * const * st_iter = sl->Begin(); st_iter != sl->End(); st_iter++) {
382  const Station *st = *st_iter;
383  if (HasBit(st->goods[cid].status, GoodsEntry::GES_EVER_ACCEPTED)) SetBit(res, 0);
384  if (HasBit(st->goods[cid].status, GoodsEntry::GES_LAST_MONTH)) SetBit(res, 1);
385  if (HasBit(st->goods[cid].status, GoodsEntry::GES_CURRENT_MONTH)) SetBit(res, 2);
387  }
388 
389  /* Cargo triggered CB 148? */
390  if (HasBit(this->watched_cargo_triggers, cid)) SetBit(res, 4);
391 
392  return res;
393  }
394 
395  /* Distance test for some house types */
396  case 0x65: return GetDistanceFromNearbyHouse(parameter, this->tile, this->house_id);
397 
398  /* Class and ID of nearby house tile */
399  case 0x66: {
400  TileIndex testtile = GetNearbyTile(parameter, this->tile);
401  if (!IsTileType(testtile, MP_HOUSE)) return 0xFFFFFFFF;
402  HouseSpec *hs = HouseSpec::Get(GetHouseType(testtile));
403  /* Information about the grf local classid if the house has a class */
404  uint houseclass = 0;
405  if (hs->class_id != HOUSE_NO_CLASS) {
406  houseclass = (hs->grf_prop.grffile == this->ro.grffile ? 1 : 2) << 8;
407  houseclass |= _class_mapping[hs->class_id].class_id;
408  }
409  /* old house type or grf-local houseid */
410  uint local_houseid = 0;
411  if (this->house_id < NEW_HOUSE_OFFSET) {
412  local_houseid = this->house_id;
413  } else {
414  local_houseid = (hs->grf_prop.grffile == this->ro.grffile ? 1 : 2) << 8;
415  local_houseid |= hs->grf_prop.local_id;
416  }
417  return houseclass << 16 | local_houseid;
418  }
419 
420  /* GRFID of nearby house tile */
421  case 0x67: {
422  TileIndex testtile = GetNearbyTile(parameter, this->tile);
423  if (!IsTileType(testtile, MP_HOUSE)) return 0xFFFFFFFF;
424  HouseID house_id = GetHouseType(testtile);
425  if (house_id < NEW_HOUSE_OFFSET) return 0;
426  /* Checking the grffile information via HouseSpec doesn't work
427  * in case the newgrf was removed. */
428  return _house_mngr.GetGRFID(house_id);
429  }
430  }
431 
432  DEBUG(grf, 1, "Unhandled house variable 0x%X", variable);
433 
434  *available = false;
435  return UINT_MAX;
436 }
437 
438 uint16 GetHouseCallback(CallbackID callback, uint32 param1, uint32 param2, HouseID house_id, Town *town, TileIndex tile,
439  bool not_yet_constructed, uint8 initial_random_bits, uint32 watched_cargo_triggers)
440 {
441  assert(IsValidTile(tile) && (not_yet_constructed || IsTileType(tile, MP_HOUSE)));
442 
443  HouseResolverObject object(house_id, tile, town, callback, param1, param2,
444  not_yet_constructed, initial_random_bits, watched_cargo_triggers);
445  return object.ResolveCallback();
446 }
447 
448 static void DrawTileLayout(const TileInfo *ti, const TileLayoutSpriteGroup *group, byte stage, HouseID house_id)
449 {
450  const DrawTileSprites *dts = group->ProcessRegisters(&stage);
451 
452  const HouseSpec *hs = HouseSpec::Get(house_id);
453  PaletteID palette = hs->random_colour[TileHash2Bit(ti->x, ti->y)] + PALETTE_RECOLOUR_START;
455  uint16 callback = GetHouseCallback(CBID_HOUSE_COLOUR, 0, 0, house_id, Town::GetByTile(ti->tile), ti->tile);
456  if (callback != CALLBACK_FAILED) {
457  /* If bit 14 is set, we should use a 2cc colour map, else use the callback value. */
458  palette = HasBit(callback, 14) ? GB(callback, 0, 8) + SPR_2CCMAP_BASE : callback;
459  }
460  }
461 
462  SpriteID image = dts->ground.sprite;
463  PaletteID pal = dts->ground.pal;
464 
465  if (HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE)) image += stage;
466  if (HasBit(pal, SPRITE_MODIFIER_CUSTOM_SPRITE)) pal += stage;
467 
468  if (GB(image, 0, SPRITE_WIDTH) != 0) {
469  DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, palette));
470  }
471 
472  DrawNewGRFTileSeq(ti, dts, TO_HOUSES, stage, palette);
473 }
474 
475 void DrawNewHouseTile(TileInfo *ti, HouseID house_id)
476 {
477  const HouseSpec *hs = HouseSpec::Get(house_id);
478 
479  if (ti->tileh != SLOPE_FLAT) {
480  bool draw_old_one = true;
482  /* Called to determine the type (if any) of foundation to draw for the house tile */
483  uint32 callback_res = GetHouseCallback(CBID_HOUSE_DRAW_FOUNDATIONS, 0, 0, house_id, Town::GetByTile(ti->tile), ti->tile);
484  if (callback_res != CALLBACK_FAILED) draw_old_one = ConvertBooleanCallback(hs->grf_prop.grffile, CBID_HOUSE_DRAW_FOUNDATIONS, callback_res);
485  }
486 
487  if (draw_old_one) DrawFoundation(ti, FOUNDATION_LEVELED);
488  }
489 
490  HouseResolverObject object(house_id, ti->tile, Town::GetByTile(ti->tile));
491 
492  const SpriteGroup *group = object.Resolve();
493  if (group != NULL && group->type == SGT_TILELAYOUT) {
494  /* Limit the building stage to the number of stages supplied. */
495  const TileLayoutSpriteGroup *tlgroup = (const TileLayoutSpriteGroup *)group;
496  byte stage = GetHouseBuildingStage(ti->tile);
497  DrawTileLayout(ti, tlgroup, stage, house_id);
498  }
499 }
500 
501 /* Simple wrapper for GetHouseCallback to keep the animation unified. */
502 uint16 GetSimpleHouseCallback(CallbackID callback, uint32 param1, uint32 param2, const HouseSpec *spec, Town *town, TileIndex tile, uint32 extra_data)
503 {
504  return GetHouseCallback(callback, param1, param2, spec - HouseSpec::Get(0), town, tile, false, 0, extra_data);
505 }
506 
508 struct HouseAnimationBase : public AnimationBase<HouseAnimationBase, HouseSpec, Town, uint32, GetSimpleHouseCallback> {
509  static const CallbackID cb_animation_speed = CBID_HOUSE_ANIMATION_SPEED;
510  static const CallbackID cb_animation_next_frame = CBID_HOUSE_ANIMATION_NEXT_FRAME;
511 
512  static const HouseCallbackMask cbm_animation_speed = CBM_HOUSE_ANIMATION_SPEED;
513  static const HouseCallbackMask cbm_animation_next_frame = CBM_HOUSE_ANIMATION_NEXT_FRAME;
514 };
515 
516 void AnimateNewHouseTile(TileIndex tile)
517 {
518  const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
519  if (hs == NULL) return;
520 
521  HouseAnimationBase::AnimateTile(hs, Town::GetByTile(tile), tile, HasBit(hs->extra_flags, CALLBACK_1A_RANDOM_BITS));
522 }
523 
524 void AnimateNewHouseConstruction(TileIndex tile)
525 {
526  const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
527 
530  }
531 }
532 
533 bool CanDeleteHouse(TileIndex tile)
534 {
535  const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
536 
537  /* Humans are always allowed to remove buildings, as is water and disasters and
538  * anyone using the scenario editor. */
540  return true;
541  }
542 
544  uint16 callback_res = GetHouseCallback(CBID_HOUSE_DENY_DESTRUCTION, 0, 0, GetHouseType(tile), Town::GetByTile(tile), tile);
545  return (callback_res == CALLBACK_FAILED || !ConvertBooleanCallback(hs->grf_prop.grffile, CBID_HOUSE_DENY_DESTRUCTION, callback_res));
546  } else {
547  return !(hs->extra_flags & BUILDING_IS_PROTECTED);
548  }
549 }
550 
551 static void AnimationControl(TileIndex tile, uint16 random_bits)
552 {
553  const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
554 
556  uint32 param = (hs->extra_flags & SYNCHRONISED_CALLBACK_1B) ? (GB(Random(), 0, 16) | random_bits << 16) : Random();
557  HouseAnimationBase::ChangeAnimationFrame(CBID_HOUSE_ANIMATION_START_STOP, hs, Town::GetByTile(tile), tile, param, 0);
558  }
559 }
560 
561 bool NewHouseTileLoop(TileIndex tile)
562 {
563  const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
564 
565  if (GetHouseProcessingTime(tile) > 0) {
567  return true;
568  }
569 
570  TriggerHouse(tile, HOUSE_TRIGGER_TILE_LOOP);
571  if (hs->building_flags & BUILDING_HAS_1_TILE) TriggerHouse(tile, HOUSE_TRIGGER_TILE_LOOP_TOP);
572 
574  /* If this house is marked as having a synchronised callback, all the
575  * tiles will have the callback called at once, rather than when the
576  * tile loop reaches them. This should only be enabled for the northern
577  * tile, or strange things will happen (here, and in TTDPatch). */
579  uint16 random = GB(Random(), 0, 16);
580 
581  if (hs->building_flags & BUILDING_HAS_1_TILE) AnimationControl(tile, random);
582  if (hs->building_flags & BUILDING_2_TILES_Y) AnimationControl(TILE_ADDXY(tile, 0, 1), random);
583  if (hs->building_flags & BUILDING_2_TILES_X) AnimationControl(TILE_ADDXY(tile, 1, 0), random);
584  if (hs->building_flags & BUILDING_HAS_4_TILES) AnimationControl(TILE_ADDXY(tile, 1, 1), random);
585  } else {
586  AnimationControl(tile, 0);
587  }
588  }
589 
590  /* Check callback 21, which determines if a house should be destroyed. */
592  uint16 callback_res = GetHouseCallback(CBID_HOUSE_DESTRUCTION, 0, 0, GetHouseType(tile), Town::GetByTile(tile), tile);
593  if (callback_res != CALLBACK_FAILED && Convert8bitBooleanCallback(hs->grf_prop.grffile, CBID_HOUSE_DESTRUCTION, callback_res)) {
594  ClearTownHouse(Town::GetByTile(tile), tile);
595  return false;
596  }
597  }
598 
600  MarkTileDirtyByTile(tile);
601  return true;
602 }
603 
604 static void DoTriggerHouse(TileIndex tile, HouseTrigger trigger, byte base_random, bool first)
605 {
606  /* We can't trigger a non-existent building... */
607  assert(IsTileType(tile, MP_HOUSE));
608 
609  HouseID hid = GetHouseType(tile);
610  HouseSpec *hs = HouseSpec::Get(hid);
611 
612  if (hs->grf_prop.spritegroup[0] == NULL) return;
613 
614  HouseResolverObject object(hid, tile, Town::GetByTile(tile), CBID_RANDOM_TRIGGER);
615  object.trigger = trigger;
616 
617  const SpriteGroup *group = object.Resolve();
618  if (group == NULL) return;
619 
620  byte new_random_bits = Random();
621  byte random_bits = GetHouseRandomBits(tile);
622  uint32 reseed = object.GetReseedSum(); // The scope only affects triggers, not the reseeding
623  random_bits &= ~reseed;
624  random_bits |= (first ? new_random_bits : base_random) & reseed;
625  SetHouseRandomBits(tile, random_bits);
626 
627  switch (trigger) {
628  case HOUSE_TRIGGER_TILE_LOOP:
629  /* Random value already set. */
630  break;
631 
632  case HOUSE_TRIGGER_TILE_LOOP_TOP:
633  if (!first) {
634  /* The top tile is marked dirty by the usual TileLoop */
635  MarkTileDirtyByTile(tile);
636  break;
637  }
638  /* Random value of first tile already set. */
639  if (hs->building_flags & BUILDING_2_TILES_Y) DoTriggerHouse(TILE_ADDXY(tile, 0, 1), trigger, random_bits, false);
640  if (hs->building_flags & BUILDING_2_TILES_X) DoTriggerHouse(TILE_ADDXY(tile, 1, 0), trigger, random_bits, false);
641  if (hs->building_flags & BUILDING_HAS_4_TILES) DoTriggerHouse(TILE_ADDXY(tile, 1, 1), trigger, random_bits, false);
642  break;
643  }
644 }
645 
646 void TriggerHouse(TileIndex t, HouseTrigger trigger)
647 {
648  DoTriggerHouse(t, trigger, 0, true);
649 }
650 
658 void DoWatchedCargoCallback(TileIndex tile, TileIndex origin, uint32 trigger_cargoes, uint16 random)
659 {
660  TileIndexDiffC diff = TileIndexToTileIndexDiffC(origin, tile);
661  uint32 cb_info = random << 16 | (uint8)diff.y << 8 | (uint8)diff.x;
662  HouseAnimationBase::ChangeAnimationFrame(CBID_HOUSE_WATCHED_CARGO_ACCEPTED, HouseSpec::Get(GetHouseType(tile)), Town::GetByTile(tile), tile, 0, cb_info, trigger_cargoes);
663 }
664 
671 void WatchedCargoCallback(TileIndex tile, uint32 trigger_cargoes)
672 {
673  assert(IsTileType(tile, MP_HOUSE));
674  HouseID id = GetHouseType(tile);
675  const HouseSpec *hs = HouseSpec::Get(id);
676 
677  trigger_cargoes &= hs->watched_cargoes;
678  /* None of the trigger cargoes is watched? */
679  if (trigger_cargoes == 0) return;
680 
681  /* Same random value for all tiles of a multi-tile house. */
682  uint16 r = Random();
683 
684  /* Do the callback, start at northern tile. */
685  TileIndex north = tile + GetHouseNorthPart(id);
686  hs = HouseSpec::Get(id);
687 
688  DoWatchedCargoCallback(north, tile, trigger_cargoes, r);
689  if (hs->building_flags & BUILDING_2_TILES_Y) DoWatchedCargoCallback(TILE_ADDXY(north, 0, 1), tile, trigger_cargoes, r);
690  if (hs->building_flags & BUILDING_2_TILES_X) DoWatchedCargoCallback(TILE_ADDXY(north, 1, 0), tile, trigger_cargoes, r);
691  if (hs->building_flags & BUILDING_HAS_4_TILES) DoWatchedCargoCallback(TILE_ADDXY(north, 1, 1), tile, trigger_cargoes, r);
692 }
693