src/newgrf_house.cpp

   1 /* $Id$ */
   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
  10 /** @file newgrf_house.cpp Implementation of NewGRF houses. */
  11
  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 static BuildingCounts<uint32> _building_counts;
  28 static HouseClassMapping _class_mapping[HOUSE_CLASS_MAX];
  29
  30 HouseOverrideManager _house_mngr(NEW_HOUSE_OFFSET, NUM_HOUSES, INVALID_HOUSE_ID);
  31
  32 /**
  33  * Constructor of a house scope resolver.
  34  * @param ro Surrounding resolver.
  35  * @param house_id House type being queried.
  36  * @param tile %Tile containing the house.
  37  * @param town %Town containing the house.
  38  * @param not_yet_constructed House is still under construction.
  39  * @param initial_random_bits Random bits during construction checks.
  40  * @param watched_cargo_triggers Cargo types that triggered the watched cargo callback.
  41  */
  42 HouseScopeResolver::HouseScopeResolver(ResolverObject &ro, HouseID house_id, TileIndex tile, Town *town,
  43                         bool not_yet_constructed, uint8 initial_random_bits, uint32 watched_cargo_triggers)
  44                 : ScopeResolver(ro)
  45 {
  46         this->house_id = house_id;
  47         this->tile = tile;
  48         this->town = town;
  49         this->not_yet_constructed = not_yet_constructed;
  50         this->initial_random_bits = initial_random_bits;
  51         this->watched_cargo_triggers = watched_cargo_triggers;
  52 }
  53
  54 /**
  55  * Retrieve the grf file associated with a house.
  56  * @param house_id House to query.
  57  * @return The associated GRF file (may be \c NULL).
  58  */
  59 static const GRFFile *GetHouseSpecGrf(HouseID house_id)
  60 {
  61         const HouseSpec *hs  = HouseSpec::Get(house_id);
  62         return (hs != NULL) ? hs->grf_prop.grffile : NULL;
  63 }
  64
  65 /**
  66  * Construct a resolver for a house.
  67  * @param house_id House to query.
  68  * @param tile %Tile containing the house.
  69  * @param town %Town containing the house.
  70  * @param callback Callback ID.
  71  * @param param1 First parameter (var 10) of the callback.
  72  * @param param2 Second parameter (var 18) of the callback.
  73  * @param not_yet_constructed House is still under construction.
  74  * @param initial_random_bits Random bits during construction checks.
  75  * @param watched_cargo_triggers Cargo types that triggered the watched cargo callback.
  76  */
  77 HouseResolverObject::HouseResolverObject(HouseID house_id, TileIndex tile, Town *town,
  78                 CallbackID callback, uint32 param1, uint32 param2,
  79                 bool not_yet_constructed, uint8 initial_random_bits, uint32 watched_cargo_triggers)
  80         : ResolverObject(GetHouseSpecGrf(house_id), callback, param1, param2),
  81         house_scope(*this, house_id, tile, town, not_yet_constructed, initial_random_bits, watched_cargo_triggers),
  82         town_scope(*this, town, not_yet_constructed) // Don't access StorePSA if house is not yet constructed.
  83 {
  84 }
  85
  86 HouseClassID AllocateHouseClassID(byte grf_class_id, uint32 grfid)
  87 {
  88         /* Start from 1 because 0 means that no class has been assigned. */
  89         for (int i = 1; i != lengthof(_class_mapping); i++) {
  90                 HouseClassMapping *map = &_class_mapping[i];
  91
  92                 if (map->class_id == grf_class_id && map->grfid == grfid) return (HouseClassID)i;
  93
  94                 if (map->class_id == 0 && map->grfid == 0) {
  95                         map->class_id = grf_class_id;
  96                         map->grfid    = grfid;
  97                         return (HouseClassID)i;
  98                 }
  99         }
 100         return HOUSE_NO_CLASS;
 101 }
 102
 103 void InitializeBuildingCounts()
 104 {
 105         memset(&_building_counts, 0, sizeof(_building_counts));
 106
 107         Town *t;
 108         FOR_ALL_TOWNS(t) {
 109                 memset(&t->cache.building_counts, 0, sizeof(t->cache.building_counts));
 110         }
 111 }
 112
 113 /**
 114  * IncreaseBuildingCount()
 115  * Increase the count of a building when it has been added by a town.
 116  * @param t The town that the building is being built in
 117  * @param house_id The id of the house being added
 118  */
 119 void IncreaseBuildingCount(Town *t, HouseID house_id)
 120 {
 121         HouseClassID class_id = HouseSpec::Get(house_id)->class_id;
 122
 123         if (!_loaded_newgrf_features.has_newhouses) return;
 124
 125         t->cache.building_counts.id_count[house_id]++;
 126         _building_counts.id_count[house_id]++;
 127
 128         if (class_id == HOUSE_NO_CLASS) return;
 129
 130         t->cache.building_counts.class_count[class_id]++;
 131         _building_counts.class_count[class_id]++;
 132 }
 133
 134 /**
 135  * DecreaseBuildingCount()
 136  * Decrease the number of a building when it is deleted.
 137  * @param t The town that the building was built in
 138  * @param house_id The id of the house being removed
 139  */
 140 void DecreaseBuildingCount(Town *t, HouseID house_id)
 141 {
 142         HouseClassID class_id = HouseSpec::Get(house_id)->class_id;
 143
 144         if (!_loaded_newgrf_features.has_newhouses) return;
 145
 146         if (t->cache.building_counts.id_count[house_id] > 0) t->cache.building_counts.id_count[house_id]--;
 147         if (_building_counts.id_count[house_id] > 0) _building_counts.id_count[house_id]--;
 148
 149         if (class_id == HOUSE_NO_CLASS) return;
 150
 151         if (t->cache.building_counts.class_count[class_id] > 0) t->cache.building_counts.class_count[class_id]--;
 152         if (_building_counts.class_count[class_id] > 0) _building_counts.class_count[class_id]--;
 153 }
 154
 155 /* virtual */ uint32 HouseScopeResolver::GetRandomBits() const
 156 {
 157         /* Note: Towns build houses over houses. So during construction checks 'tile' may be a valid but unrelated house. */
 158         assert(IsValidTile(this->tile) && (this->not_yet_constructed || IsHouseTile(this->tile)));
 159         return this->not_yet_constructed ? this->initial_random_bits : GetHouseRandomBits(this->tile);
 160 }
 161
 162 /* virtual */ uint32 HouseScopeResolver::GetTriggers() const
 163 {
 164         /* Note: Towns build houses over houses. So during construction checks 'tile' may be a valid but unrelated house. */
 165         assert(IsValidTile(this->tile) && (this->not_yet_constructed || IsHouseTile(this->tile)));
 166         return this->not_yet_constructed ? 0 : GetHouseTriggers(this->tile);
 167 }
 168
 169 /* virtual */ void HouseScopeResolver::SetTriggers(int triggers) const
 170 {
 171         assert(!this->not_yet_constructed && IsValidTile(this->tile) && IsHouseTile(this->tile));
 172         SetHouseTriggers(this->tile, triggers);
 173 }
 174
 175 static uint32 GetNumHouses(HouseID house_id, const Town *town)
 176 {
 177         uint8 map_id_count, town_id_count, map_class_count, town_class_count;
 178         HouseClassID class_id = HouseSpec::Get(house_id)->class_id;
 179
 180         map_id_count     = ClampU(_building_counts.id_count[house_id], 0, 255);
 181         map_class_count  = ClampU(_building_counts.class_count[class_id], 0, 255);
 182         town_id_count    = ClampU(town->cache.building_counts.id_count[house_id], 0, 255);
 183         town_class_count = ClampU(town->cache.building_counts.class_count[class_id], 0, 255);
 184
 185         return map_class_count << 24 | town_class_count << 16 | map_id_count << 8 | town_id_count;
 186 }
 187
 188 /**
 189  * Get information about a nearby tile.
 190  * @param parameter from callback. It's in fact a pair of coordinates
 191  * @param tile TileIndex from which the callback was initiated
 192  * @param grf_version8 True, if we are dealing with a new NewGRF which uses GRF version >= 8.
 193  * @return a construction of bits obeying the newgrf format
 194  */
 195 static uint32 GetNearbyTileInformation(byte parameter, TileIndex tile, bool grf_version8)
 196 {
 197         tile = GetNearbyTile(parameter, tile);
 198         return GetNearbyTileInformation(tile, grf_version8);
 199 }
 200
 201 /** Structure with user-data for SearchNearbyHouseXXX - functions */
 202 struct SearchNearbyHouseData {
 203         const HouseSpec *hs;  ///< Specs of the house that started the search.
 204         TileIndex north_tile; ///< Northern tile of the house.
 205 };
 206
 207 /**
 208  * Callback function to search a house by its HouseID
 209  * @param tile TileIndex to be examined
 210  * @param user_data SearchNearbyHouseData
 211  * @return true or false, if found or not
 212  */
 213 static bool SearchNearbyHouseID(TileIndex tile, void *user_data)
 214 {
 215         if (IsHouseTile(tile)) {
 216                 HouseID house = GetHouseType(tile); // tile been examined
 217                 const HouseSpec *hs = HouseSpec::Get(house);
 218                 if (hs->grf_prop.grffile != NULL) { // must be one from a grf file
 219                         SearchNearbyHouseData *nbhd = (SearchNearbyHouseData *)user_data;
 220
 221                         TileIndex north_tile = tile + GetHouseNorthPart(house); // modifies 'house'!
 222                         if (north_tile == nbhd->north_tile) return false; // Always ignore origin house
 223
 224                         return hs->grf_prop.local_id == nbhd->hs->grf_prop.local_id &&  // same local id as the one requested
 225                                 hs->grf_prop.grffile->grfid == nbhd->hs->grf_prop.grffile->grfid;  // from the same grf
 226                 }
 227         }
 228         return false;
 229 }
 230
 231 /**
 232  * Callback function to search a house by its classID
 233  * @param tile TileIndex to be examined
 234  * @param user_data SearchNearbyHouseData
 235  * @return true or false, if found or not
 236  */
 237 static bool SearchNearbyHouseClass(TileIndex tile, void *user_data)
 238 {
 239         if (IsHouseTile(tile)) {
 240                 HouseID house = GetHouseType(tile); // tile been examined
 241                 const HouseSpec *hs = HouseSpec::Get(house);
 242                 if (hs->grf_prop.grffile != NULL) { // must be one from a grf file
 243                         SearchNearbyHouseData *nbhd = (SearchNearbyHouseData *)user_data;
 244
 245                         TileIndex north_tile = tile + GetHouseNorthPart(house); // modifies 'house'!
 246                         if (north_tile == nbhd->north_tile) return false; // Always ignore origin house
 247
 248                         return hs->class_id == nbhd->hs->class_id &&  // same classid as the one requested
 249                                 hs->grf_prop.grffile->grfid == nbhd->hs->grf_prop.grffile->grfid;  // from the same grf
 250                 }
 251         }
 252         return false;
 253 }
 254
 255 /**
 256  * Callback function to search a house by its grfID
 257  * @param tile TileIndex to be examined
 258  * @param user_data SearchNearbyHouseData
 259  * @return true or false, if found or not
 260  */
 261 static bool SearchNearbyHouseGRFID(TileIndex tile, void *user_data)
 262 {
 263         if (IsHouseTile(tile)) {
 264                 HouseID house = GetHouseType(tile); // tile been examined
 265                 const HouseSpec *hs = HouseSpec::Get(house);
 266                 if (hs->grf_prop.grffile != NULL) { // must be one from a grf file
 267                         SearchNearbyHouseData *nbhd = (SearchNearbyHouseData *)user_data;
 268
 269                         TileIndex north_tile = tile + GetHouseNorthPart(house); // modifies 'house'!
 270                         if (north_tile == nbhd->north_tile) return false; // Always ignore origin house
 271
 272                         return hs->grf_prop.grffile->grfid == nbhd->hs->grf_prop.grffile->grfid;  // from the same grf
 273                 }
 274         }
 275         return false;
 276 }
 277
 278 /**
 279  * This function will activate a search around a central tile, looking for some houses
 280  * that fit the requested characteristics
 281  * @param parameter that is given by the callback.
 282  *                  bits 0..6 radius of the search
 283  *                  bits 7..8 search type i.e.: 0 = houseID/ 1 = classID/ 2 = grfID
 284  * @param tile TileIndex from which to start the search
 285  * @param house the HouseID that is associated to the house, the callback is called for
 286  * @return the Manhattan distance from the center tile, if any, and 0 if failure
 287  */
 288 static uint32 GetDistanceFromNearbyHouse(uint8 parameter, TileIndex tile, HouseID house)
 289 {
 290         static TestTileOnSearchProc * const search_procs[3] = {
 291                 SearchNearbyHouseID,
 292                 SearchNearbyHouseClass,
 293                 SearchNearbyHouseGRFID,
 294         };
 295         TileIndex found_tile = tile;
 296         uint8 searchtype = GB(parameter, 6, 2);
 297         uint8 searchradius = GB(parameter, 0, 6);
 298         if (searchtype >= lengthof(search_procs)) return 0;  // do not run on ill-defined code
 299         if (searchradius < 1) return 0; // do not use a too low radius
 300
 301         SearchNearbyHouseData nbhd;
 302         nbhd.hs = HouseSpec::Get(house);
 303         nbhd.north_tile = tile + GetHouseNorthPart(house); // modifies 'house'!
 304
 305         /* Use a pointer for the tile to start the search. Will be required for calculating the distance*/
 306         if (CircularTileSearch(&found_tile, 2 * searchradius + 1, search_procs[searchtype], &nbhd)) {
 307                 return DistanceManhattan(found_tile, tile);
 308         }
 309         return 0;
 310 }
 311
 312 /**
 313  * @note Used by the resolver to get values for feature 07 deterministic spritegroups.
 314  */
 315 /* virtual */ uint32 HouseScopeResolver::GetVariable(byte variable, uint32 parameter, bool *available) const
 316 {
 317         switch (variable) {
 318                 /* Construction stage. */
 319                 case 0x40: return (IsHouseTile(this->tile) ? GetHouseBuildingStage(this->tile) : 0) | TileHash2Bit(TileX(this->tile), TileY(this->tile)) << 2;
 320
 321                 /* Building age. */
 322                 case 0x41: return IsHouseTile(this->tile) ? GetHouseAge(this->tile) : 0;
 323
 324                 /* Town zone */
 325                 case 0x42: return GetTownRadiusGroup(this->town, this->tile);
 326
 327                 /* Terrain type */
 328                 case 0x43: return GetTerrainType(this->tile);
 329
 330                 /* Number of this type of building on the map. */
 331                 case 0x44: return GetNumHouses(this->house_id, this->town);
 332
 333                 /* Whether the town is being created or just expanded. */
 334                 case 0x45: return _generating_world ? 1 : 0;
 335
 336                 /* Current animation frame. */
 337                 case 0x46: return IsHouseTile(this->tile) ? GetAnimationFrame(this->tile) : 0;
 338
 339                 /* Position of the house */
 340                 case 0x47: return TileY(this->tile) << 16 | TileX(this->tile);
 341
 342                 /* Building counts for old houses with id = parameter. */
 343                 case 0x60: return parameter < NEW_HOUSE_OFFSET ? GetNumHouses(parameter, this->town) : 0;
 344
 345                 /* Building counts for new houses with id = parameter. */
 346                 case 0x61: {
 347                         const HouseSpec *hs = HouseSpec::Get(this->house_id);
 348                         if (hs->grf_prop.grffile == NULL) return 0;
 349
 350                         HouseID new_house = _house_mngr.GetID(parameter, hs->grf_prop.grffile->grfid);
 351                         return new_house == INVALID_HOUSE_ID ? 0 : GetNumHouses(new_house, this->town);
 352                 }
 353
 354                 /* Land info for nearby tiles. */
 355                 case 0x62: return GetNearbyTileInformation(parameter, this->tile, this->ro.grffile->grf_version >= 8);
 356
 357                 /* Current animation frame of nearby house tiles */
 358                 case 0x63: {
 359                         TileIndex testtile = GetNearbyTile(parameter, this->tile);
 360                         return IsHouseTile(testtile) ? GetAnimationFrame(testtile) : 0;
 361                 }
 362
 363                 /* Cargo acceptance history of nearby stations */
 364                 case 0x64: {
 365                         CargoID cid = GetCargoTranslation(parameter, this->ro.grffile);
 366                         if (cid == CT_INVALID) return 0;
 367
 368                         /* Extract tile offset. */
 369                         int8 x_offs = GB(GetRegister(0x100), 0, 8);
 370                         int8 y_offs = GB(GetRegister(0x100), 8, 8);
 371                         TileIndex testtile = TILE_MASK(this->tile + TileDiffXY(x_offs, y_offs));
 372
 373                         StationFinder stations(TileArea(testtile, 1, 1));
 374                         const StationList *sl = stations.GetStations();
 375
 376                         /* Collect acceptance stats. */
 377                         uint32 res = 0;
 378                         for (Station * const * st_iter = sl->Begin(); st_iter != sl->End(); st_iter++) {
 379                                 const Station *st = *st_iter;
 380                                 if (HasBit(st->goods[cid].acceptance_pickup, GoodsEntry::GES_EVER_ACCEPTED))    SetBit(res, 0);
 381                                 if (HasBit(st->goods[cid].acceptance_pickup, GoodsEntry::GES_LAST_MONTH))       SetBit(res, 1);
 382                                 if (HasBit(st->goods[cid].acceptance_pickup, GoodsEntry::GES_CURRENT_MONTH))    SetBit(res, 2);
 383                                 if (HasBit(st->goods[cid].acceptance_pickup, GoodsEntry::GES_ACCEPTED_BIGTICK)) SetBit(res, 3);
 384                         }
 385
 386                         /* Cargo triggered CB 148? */
 387                         if (HasBit(this->watched_cargo_triggers, cid)) SetBit(res, 4);
 388
 389                         return res;
 390                 }
 391
 392                 /* Distance test for some house types */
 393                 case 0x65: return GetDistanceFromNearbyHouse(parameter, this->tile, this->house_id);
 394
 395                 /* Class and ID of nearby house tile */
 396                 case 0x66: {
 397                         TileIndex testtile = GetNearbyTile(parameter, this->tile);
 398                         if (!IsHouseTile(testtile)) return 0xFFFFFFFF;
 399                         HouseSpec *hs = HouseSpec::Get(GetHouseType(testtile));
 400                         /* Information about the grf local classid if the house has a class */
 401                         uint houseclass = 0;
 402                         if (hs->class_id != HOUSE_NO_CLASS) {
 403                                 houseclass = (hs->grf_prop.grffile == this->ro.grffile ? 1 : 2) << 8;
 404                                 houseclass |= _class_mapping[hs->class_id].class_id;
 405                         }
 406                         /* old house type or grf-local houseid */
 407                         uint local_houseid = 0;
 408                         if (this->house_id < NEW_HOUSE_OFFSET) {
 409                                 local_houseid = this->house_id;
 410                         } else {
 411                                 local_houseid = (hs->grf_prop.grffile == this->ro.grffile ? 1 : 2) << 8;
 412                                 local_houseid |= hs->grf_prop.local_id;
 413                         }
 414                         return houseclass << 16 | local_houseid;
 415                 }
 416
 417                 /* GRFID of nearby house tile */
 418                 case 0x67: {
 419                         TileIndex testtile = GetNearbyTile(parameter, this->tile);
 420                         if (!IsHouseTile(testtile)) return 0xFFFFFFFF;
 421                         HouseID house_id = GetHouseType(testtile);
 422                         if (house_id < NEW_HOUSE_OFFSET) return 0;
 423                         /* Checking the grffile information via HouseSpec doesn't work
 424                          * in case the newgrf was removed. */
 425                         return _house_mngr.GetGRFID(house_id);
 426                 }
 427         }
 428
 429         DEBUG(grf, 1, "Unhandled house variable 0x%X", variable);
 430
 431         *available = false;
 432         return UINT_MAX;
 433 }
 434
 435 uint16 GetHouseCallback(CallbackID callback, uint32 param1, uint32 param2, HouseID house_id, Town *town, TileIndex tile,
 436                 bool not_yet_constructed, uint8 initial_random_bits, uint32 watched_cargo_triggers)
 437 {
 438         assert(IsValidTile(tile) && (not_yet_constructed || IsHouseTile(tile)));
 439
 440         HouseResolverObject object(house_id, tile, town, callback, param1, param2,
 441                         not_yet_constructed, initial_random_bits, watched_cargo_triggers);
 442
 443         const SpriteGroup *group = SpriteGroup::Resolve(HouseSpec::Get(house_id)->grf_prop.spritegroup[0], object);
 444         if (group == NULL) return CALLBACK_FAILED;
 445
 446         return group->GetCallbackResult();
 447 }
 448
 449 static void DrawTileLayout(const TileInfo *ti, const TileLayoutSpriteGroup *group, byte stage, HouseID house_id)
 450 {
 451         const DrawTileSprites *dts = group->ProcessRegisters(&stage);
 452
 453         const HouseSpec *hs = HouseSpec::Get(house_id);
 454         PaletteID palette = hs->random_colour[TileHash2Bit(ti->x, ti->y)] + PALETTE_RECOLOUR_START;
 455         if (HasBit(hs->callback_mask, CBM_HOUSE_COLOUR)) {
 456                 uint16 callback = GetHouseCallback(CBID_HOUSE_COLOUR, 0, 0, house_id, Town::GetByTile(ti->tile), ti->tile);
 457                 if (callback != CALLBACK_FAILED) {
 458                         /* If bit 14 is set, we should use a 2cc colour map, else use the callback value. */
 459                         palette = HasBit(callback, 14) ? GB(callback, 0, 8) + SPR_2CCMAP_BASE : callback;
 460                 }
 461         }
 462
 463         SpriteID image = dts->ground.sprite;
 464         PaletteID pal  = dts->ground.pal;
 465
 466         if (HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE)) image += stage;
 467         if (HasBit(pal, SPRITE_MODIFIER_CUSTOM_SPRITE)) pal += stage;
 468
 469         if (GB(image, 0, SPRITE_WIDTH) != 0) {
 470                 DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, palette));
 471         }
 472
 473         DrawNewGRFTileSeq(ti, dts, TO_HOUSES, stage, palette);
 474 }
 475
 476 void DrawNewHouseTile(TileInfo *ti, HouseID house_id)
 477 {
 478         const HouseSpec *hs = HouseSpec::Get(house_id);
 479
 480         if (ti->tileh != SLOPE_FLAT) {
 481                 bool draw_old_one = true;
 482                 if (HasBit(hs->callback_mask, CBM_HOUSE_DRAW_FOUNDATIONS)) {
 483                         /* Called to determine the type (if any) of foundation to draw for the house tile */
 484                         uint32 callback_res = GetHouseCallback(CBID_HOUSE_DRAW_FOUNDATIONS, 0, 0, house_id, Town::GetByTile(ti->tile), ti->tile);
 485                         if (callback_res != CALLBACK_FAILED) draw_old_one = ConvertBooleanCallback(hs->grf_prop.grffile, CBID_HOUSE_DRAW_FOUNDATIONS, callback_res);
 486                 }
 487
 488                 if (draw_old_one) DrawFoundation(ti, FOUNDATION_LEVELED);
 489         }
 490
 491         HouseResolverObject object(house_id, ti->tile, Town::GetByTile(ti->tile));
 492
 493         const SpriteGroup *group = SpriteGroup::Resolve(hs->grf_prop.spritegroup[0], object);
 494         if (group != NULL && group->type == SGT_TILELAYOUT) {
 495                 /* Limit the building stage to the number of stages supplied. */
 496                 const TileLayoutSpriteGroup *tlgroup = (const TileLayoutSpriteGroup *)group;
 497                 byte stage = GetHouseBuildingStage(ti->tile);
 498                 DrawTileLayout(ti, tlgroup, stage, house_id);
 499         }
 500 }
 501
 502 /* Simple wrapper for GetHouseCallback to keep the animation unified. */
 503 uint16 GetSimpleHouseCallback(CallbackID callback, uint32 param1, uint32 param2, const HouseSpec *spec, Town *town, TileIndex tile, uint32 extra_data)
 504 {
 505         return GetHouseCallback(callback, param1, param2, spec - HouseSpec::Get(0), town, tile, false, 0, extra_data);
 506 }
 507
 508 /** Helper class for animation control. */
 509 struct HouseAnimationBase : public AnimationBase<HouseAnimationBase, HouseSpec, Town, uint32, GetSimpleHouseCallback> {
 510         static const CallbackID cb_animation_speed      = CBID_HOUSE_ANIMATION_SPEED;
 511         static const CallbackID cb_animation_next_frame = CBID_HOUSE_ANIMATION_NEXT_FRAME;
 512
 513         static const HouseCallbackMask cbm_animation_speed      = CBM_HOUSE_ANIMATION_SPEED;
 514         static const HouseCallbackMask cbm_animation_next_frame = CBM_HOUSE_ANIMATION_NEXT_FRAME;
 515 };
 516
 517 void AnimateNewHouseTile(TileIndex tile)
 518 {
 519         const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
 520         if (hs == NULL) return;
 521
 522         HouseAnimationBase::AnimateTile(hs, Town::GetByTile(tile), tile, HasBit(hs->extra_flags, CALLBACK_1A_RANDOM_BITS));
 523 }
 524
 525 void AnimateNewHouseConstruction(TileIndex tile)
 526 {
 527         const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
 528
 529         if (HasBit(hs->callback_mask, CBM_HOUSE_CONSTRUCTION_STATE_CHANGE)) {
 530                 HouseAnimationBase::ChangeAnimationFrame(CBID_HOUSE_CONSTRUCTION_STATE_CHANGE, hs, Town::GetByTile(tile), tile, 0, 0);
 531         }
 532 }
 533
 534 bool CanDeleteHouse(TileIndex tile)
 535 {
 536         const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
 537
 538         /* Humans are always allowed to remove buildings, as is water and disasters and
 539          * anyone using the scenario editor. */
 540         if (Company::IsValidHumanID(_current_company) || _current_company == OWNER_WATER || _current_company == OWNER_NONE || _game_mode == GM_EDITOR || _generating_world) {
 541                 return true;
 542         }
 543
 544         if (HasBit(hs->callback_mask, CBM_HOUSE_DENY_DESTRUCTION)) {
 545                 uint16 callback_res = GetHouseCallback(CBID_HOUSE_DENY_DESTRUCTION, 0, 0, GetHouseType(tile), Town::GetByTile(tile), tile);
 546                 return (callback_res == CALLBACK_FAILED || !ConvertBooleanCallback(hs->grf_prop.grffile, CBID_HOUSE_DENY_DESTRUCTION, callback_res));
 547         } else {
 548                 return !(hs->extra_flags & BUILDING_IS_PROTECTED);
 549         }
 550 }
 551
 552 static void AnimationControl(TileIndex tile, uint16 random_bits)
 553 {
 554         const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
 555
 556         if (HasBit(hs->callback_mask, CBM_HOUSE_ANIMATION_START_STOP)) {
 557                 uint32 param = (hs->extra_flags & SYNCHRONISED_CALLBACK_1B) ? (GB(Random(), 0, 16) | random_bits << 16) : Random();
 558                 HouseAnimationBase::ChangeAnimationFrame(CBID_HOUSE_ANIMATION_START_STOP, hs, Town::GetByTile(tile), tile, param, 0);
 559         }
 560 }
 561
 562 bool NewHouseTileLoop(TileIndex tile)
 563 {
 564         const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
 565
 566         if (GetHouseProcessingTime(tile) > 0) {
 567                 DecHouseProcessingTime(tile);
 568                 return true;
 569         }
 570
 571         TriggerHouse(tile, HOUSE_TRIGGER_TILE_LOOP);
 572         if (hs->building_flags & BUILDING_HAS_1_TILE) TriggerHouse(tile, HOUSE_TRIGGER_TILE_LOOP_TOP);
 573
 574         if (HasBit(hs->callback_mask, CBM_HOUSE_ANIMATION_START_STOP)) {
 575                 /* If this house is marked as having a synchronised callback, all the
 576                  * tiles will have the callback called at once, rather than when the
 577                  * tile loop reaches them. This should only be enabled for the northern
 578                  * tile, or strange things will happen (here, and in TTDPatch). */
 579                 if (hs->extra_flags & SYNCHRONISED_CALLBACK_1B) {
 580                         uint16 random = GB(Random(), 0, 16);
 581
 582                         if (hs->building_flags & BUILDING_HAS_1_TILE)  AnimationControl(tile, random);
 583                         if (hs->building_flags & BUILDING_2_TILES_Y)   AnimationControl(TILE_ADDXY(tile, 0, 1), random);
 584                         if (hs->building_flags & BUILDING_2_TILES_X)   AnimationControl(TILE_ADDXY(tile, 1, 0), random);
 585                         if (hs->building_flags & BUILDING_HAS_4_TILES) AnimationControl(TILE_ADDXY(tile, 1, 1), random);
 586                 } else {
 587                         AnimationControl(tile, 0);
 588                 }
 589         }
 590
 591         /* Check callback 21, which determines if a house should be destroyed. */
 592         if (HasBit(hs->callback_mask, CBM_HOUSE_DESTRUCTION)) {
 593                 uint16 callback_res = GetHouseCallback(CBID_HOUSE_DESTRUCTION, 0, 0, GetHouseType(tile), Town::GetByTile(tile), tile);
 594                 if (callback_res != CALLBACK_FAILED && Convert8bitBooleanCallback(hs->grf_prop.grffile, CBID_HOUSE_DESTRUCTION, callback_res)) {
 595                         ClearTownHouse(Town::GetByTile(tile), tile);
 596                         return false;
 597                 }
 598         }
 599
 600         SetHouseProcessingTime(tile, hs->processing_time);
 601         MarkTileDirtyByTile(tile);
 602         return true;
 603 }
 604
 605 static void DoTriggerHouse(TileIndex tile, HouseTrigger trigger, byte base_random, bool first)
 606 {
 607         /* We can't trigger a non-existent building... */
 608         assert(IsHouseTile(tile));
 609
 610         HouseID hid = GetHouseType(tile);
 611         HouseSpec *hs = HouseSpec::Get(hid);
 612
 613         if (hs->grf_prop.spritegroup[0] == NULL) return;
 614
 615         HouseResolverObject object(hid, tile, Town::GetByTile(tile), CBID_RANDOM_TRIGGER);
 616         object.trigger = trigger;
 617
 618         const SpriteGroup *group = SpriteGroup::Resolve(hs->grf_prop.spritegroup[0], object);
 619         if (group == NULL) return;
 620
 621         byte new_random_bits = Random();
 622         byte random_bits = GetHouseRandomBits(tile);
 623         uint32 reseed = object.GetReseedSum(); // The scope only affects triggers, not the reseeding
 624         random_bits &= ~reseed;
 625         random_bits |= (first ? new_random_bits : base_random) & reseed;
 626         SetHouseRandomBits(tile, random_bits);
 627
 628         switch (trigger) {
 629                 case HOUSE_TRIGGER_TILE_LOOP:
 630                         /* Random value already set. */
 631                         break;
 632
 633                 case HOUSE_TRIGGER_TILE_LOOP_TOP:
 634                         if (!first) {
 635                                 /* The top tile is marked dirty by the usual TileLoop */
 636                                 MarkTileDirtyByTile(tile);
 637                                 break;
 638                         }
 639                         /* Random value of first tile already set. */
 640                         if (hs->building_flags & BUILDING_2_TILES_Y)   DoTriggerHouse(TILE_ADDXY(tile, 0, 1), trigger, random_bits, false);
 641                         if (hs->building_flags & BUILDING_2_TILES_X)   DoTriggerHouse(TILE_ADDXY(tile, 1, 0), trigger, random_bits, false);
 642                         if (hs->building_flags & BUILDING_HAS_4_TILES) DoTriggerHouse(TILE_ADDXY(tile, 1, 1), trigger, random_bits, false);
 643                         break;
 644         }
 645 }
 646
 647 void TriggerHouse(TileIndex t, HouseTrigger trigger)
 648 {
 649         DoTriggerHouse(t, trigger, 0, true);
 650 }
 651
 652 /**
 653  * Run the watched cargo accepted callback for a single house tile.
 654  * @param tile The house tile.
 655  * @param origin The triggering tile.
 656  * @param trigger_cargoes Cargo types that triggered the callback.
 657  * @param random Random bits.
 658  */
 659 void DoWatchedCargoCallback(TileIndex tile, TileIndex origin, uint32 trigger_cargoes, uint16 random)
 660 {
 661         CoordDiff diff = TileCoordDiff(origin, tile);
 662         uint32 cb_info = random << 16 | (uint8)diff.y << 8 | (uint8)diff.x;
 663         HouseAnimationBase::ChangeAnimationFrame(CBID_HOUSE_WATCHED_CARGO_ACCEPTED, HouseSpec::Get(GetHouseType(tile)), Town::GetByTile(tile), tile, 0, cb_info, trigger_cargoes);
 664 }
 665
 666 /**
 667  * Run watched cargo accepted callback for a house.
 668  * @param tile House tile.
 669  * @param trigger_cargoes Triggering cargo types.
 670  * @pre IsHouseTile(t)
 671  */
 672 void WatchedCargoCallback(TileIndex tile, uint32 trigger_cargoes)
 673 {
 674         assert(IsHouseTile(tile));
 675         HouseID id = GetHouseType(tile);
 676         const HouseSpec *hs = HouseSpec::Get(id);
 677
 678         trigger_cargoes &= hs->watched_cargoes;
 679         /* None of the trigger cargoes is watched? */
 680         if (trigger_cargoes == 0) return;
 681
 682         /* Same random value for all tiles of a multi-tile house. */
 683         uint16 r = Random();
 684
 685         /* Do the callback, start at northern tile. */
 686         TileIndex north = tile + GetHouseNorthPart(id);
 687         hs = HouseSpec::Get(id);
 688
 689         DoWatchedCargoCallback(north, tile, trigger_cargoes, r);
 690         if (hs->building_flags & BUILDING_2_TILES_Y)   DoWatchedCargoCallback(TILE_ADDXY(north, 0, 1), tile, trigger_cargoes, r);
 691         if (hs->building_flags & BUILDING_2_TILES_X)   DoWatchedCargoCallback(TILE_ADDXY(north, 1, 0), tile, trigger_cargoes, r);
 692         if (hs->building_flags & BUILDING_HAS_4_TILES) DoWatchedCargoCallback(TILE_ADDXY(north, 1, 1), tile, trigger_cargoes, r);
 693 }
 694