newgrf_house.cpp

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00001 /* $Id: newgrf_house.cpp 18872 2010-01-21 01:38:13Z rubidium $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * 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.
00006  * 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.
00007  * 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/>.
00008  */
00009 
00012 #include "stdafx.h"
00013 #include "variables.h"
00014 #include "debug.h"
00015 #include "viewport_func.h"
00016 #include "landscape.h"
00017 #include "newgrf.h"
00018 #include "newgrf_house.h"
00019 #include "newgrf_spritegroup.h"
00020 #include "newgrf_town.h"
00021 #include "newgrf_sound.h"
00022 #include "newgrf_commons.h"
00023 #include "functions.h"
00024 #include "company_func.h"
00025 #include "animated_tile_func.h"
00026 #include "company_base.h"
00027 #include "town.h"
00028 #include "core/random_func.hpp"
00029 #include "sprite.h"
00030 
00031 static BuildingCounts<uint32> _building_counts;
00032 static HouseClassMapping _class_mapping[HOUSE_CLASS_MAX];
00033 
00034 HouseOverrideManager _house_mngr(NEW_HOUSE_OFFSET, HOUSE_MAX, INVALID_HOUSE_ID);
00035 
00036 HouseClassID AllocateHouseClassID(byte grf_class_id, uint32 grfid)
00037 {
00038   /* Start from 1 because 0 means that no class has been assigned. */
00039   for (int i = 1; i != lengthof(_class_mapping); i++) {
00040     HouseClassMapping *map = &_class_mapping[i];
00041 
00042     if (map->class_id == grf_class_id && map->grfid == grfid) return (HouseClassID)i;
00043 
00044     if (map->class_id == 0 && map->grfid == 0) {
00045       map->class_id = grf_class_id;
00046       map->grfid    = grfid;
00047       return (HouseClassID)i;
00048     }
00049   }
00050   return HOUSE_NO_CLASS;
00051 }
00052 
00053 void InitializeBuildingCounts()
00054 {
00055   memset(&_building_counts, 0, sizeof(_building_counts));
00056 }
00057 
00064 void IncreaseBuildingCount(Town *t, HouseID house_id)
00065 {
00066   HouseClassID class_id = HouseSpec::Get(house_id)->class_id;
00067 
00068   if (!_loaded_newgrf_features.has_newhouses) return;
00069 
00070   t->building_counts.id_count[house_id]++;
00071   _building_counts.id_count[house_id]++;
00072 
00073   if (class_id == HOUSE_NO_CLASS) return;
00074 
00075   t->building_counts.class_count[class_id]++;
00076   _building_counts.class_count[class_id]++;
00077 }
00078 
00085 void DecreaseBuildingCount(Town *t, HouseID house_id)
00086 {
00087   HouseClassID class_id = HouseSpec::Get(house_id)->class_id;
00088 
00089   if (!_loaded_newgrf_features.has_newhouses) return;
00090 
00091   if (t->building_counts.id_count[house_id] > 0) t->building_counts.id_count[house_id]--;
00092   if (_building_counts.id_count[house_id] > 0)   _building_counts.id_count[house_id]--;
00093 
00094   if (class_id == HOUSE_NO_CLASS) return;
00095 
00096   if (t->building_counts.class_count[class_id] > 0) t->building_counts.class_count[class_id]--;
00097   if (_building_counts.class_count[class_id] > 0)   _building_counts.class_count[class_id]--;
00098 }
00099 
00100 static uint32 HouseGetRandomBits(const ResolverObject *object)
00101 {
00102   const TileIndex tile = object->u.house.tile;
00103   return (tile == INVALID_TILE || !IsTileType(tile, MP_HOUSE)) ? 0 : GetHouseRandomBits(tile);
00104 }
00105 
00106 static uint32 HouseGetTriggers(const ResolverObject *object)
00107 {
00108   const TileIndex tile = object->u.house.tile;
00109   return (tile == INVALID_TILE || !IsTileType(tile, MP_HOUSE)) ? 0 : GetHouseTriggers(tile);
00110 }
00111 
00112 static void HouseSetTriggers(const ResolverObject *object, int triggers)
00113 {
00114   const TileIndex tile = object->u.house.tile;
00115   if (IsTileType(tile, MP_HOUSE)) SetHouseTriggers(tile, triggers);
00116 }
00117 
00118 static uint32 GetNumHouses(HouseID house_id, const Town *town)
00119 {
00120   uint8 map_id_count, town_id_count, map_class_count, town_class_count;
00121   HouseClassID class_id = HouseSpec::Get(house_id)->class_id;
00122 
00123   map_id_count     = ClampU(_building_counts.id_count[house_id], 0, 255);
00124   map_class_count  = ClampU(_building_counts.class_count[class_id], 0, 255);
00125   town_id_count    = ClampU(town->building_counts.id_count[house_id], 0, 255);
00126   town_class_count = ClampU(town->building_counts.class_count[class_id], 0, 255);
00127 
00128   return map_class_count << 24 | town_class_count << 16 | map_id_count << 8 | town_id_count;
00129 }
00130 
00131 uint32 GetNearbyTileInformation(byte parameter, TileIndex tile)
00132 {
00133   tile = GetNearbyTile(parameter, tile);
00134   return GetNearbyTileInformation(tile);
00135 }
00136 
00138 typedef struct {
00139   const HouseSpec *hs;  
00140   TileIndex north_tile; 
00141 } SearchNearbyHouseData;
00142 
00148 static bool SearchNearbyHouseID(TileIndex tile, void *user_data)
00149 {
00150   if (IsTileType(tile, MP_HOUSE)) {
00151     HouseID house = GetHouseType(tile); // tile been examined
00152     const HouseSpec *hs = HouseSpec::Get(house);
00153     if (hs->grffile != NULL) { // must be one from a grf file
00154       SearchNearbyHouseData *nbhd = (SearchNearbyHouseData *)user_data;
00155 
00156       TileIndex north_tile = tile + GetHouseNorthPart(house); // modifies 'house'!
00157       if (north_tile == nbhd->north_tile) return false; // Always ignore origin house
00158 
00159       return hs->local_id == nbhd->hs->local_id &&  // same local id as the one requested
00160         hs->grffile->grfid == nbhd->hs->grffile->grfid;  // from the same grf
00161     }
00162   }
00163   return false;
00164 }
00165 
00171 static bool SearchNearbyHouseClass(TileIndex tile, void *user_data)
00172 {
00173   if (IsTileType(tile, MP_HOUSE)) {
00174     HouseID house = GetHouseType(tile); // tile been examined
00175     const HouseSpec *hs = HouseSpec::Get(house);
00176     if (hs->grffile != NULL) { // must be one from a grf file
00177       SearchNearbyHouseData *nbhd = (SearchNearbyHouseData *)user_data;
00178 
00179       TileIndex north_tile = tile + GetHouseNorthPart(house); // modifies 'house'!
00180       if (north_tile == nbhd->north_tile) return false; // Always ignore origin house
00181 
00182       return hs->class_id == nbhd->hs->class_id &&  // same classid as the one requested
00183         hs->grffile->grfid == nbhd->hs->grffile->grfid;  // from the same grf
00184     }
00185   }
00186   return false;
00187 }
00188 
00194 static bool SearchNearbyHouseGRFID(TileIndex tile, void *user_data)
00195 {
00196   if (IsTileType(tile, MP_HOUSE)) {
00197     HouseID house = GetHouseType(tile); // tile been examined
00198     const HouseSpec *hs = HouseSpec::Get(house);
00199     if (hs->grffile != NULL) { // must be one from a grf file
00200       SearchNearbyHouseData *nbhd = (SearchNearbyHouseData *)user_data;
00201 
00202       TileIndex north_tile = tile + GetHouseNorthPart(house); // modifies 'house'!
00203       if (north_tile == nbhd->north_tile) return false; // Always ignore origin house
00204 
00205       return hs->grffile->grfid == nbhd->hs->grffile->grfid;  // from the same grf
00206     }
00207   }
00208   return false;
00209 }
00210 
00220 static uint32 GetDistanceFromNearbyHouse(uint8 parameter, TileIndex tile, HouseID house)
00221 {
00222   static TestTileOnSearchProc * const search_procs[3] = {
00223     SearchNearbyHouseID,
00224     SearchNearbyHouseClass,
00225     SearchNearbyHouseGRFID,
00226   };
00227   TileIndex found_tile = tile;
00228   uint8 searchtype = GB(parameter, 6, 2);
00229   uint8 searchradius = GB(parameter, 0, 6);
00230   if (searchtype >= lengthof(search_procs)) return 0;  // do not run on ill-defined code
00231   if (searchradius < 1) return 0; // do not use a too low radius
00232 
00233   SearchNearbyHouseData nbhd;
00234   nbhd.hs = HouseSpec::Get(house);
00235   nbhd.north_tile = tile + GetHouseNorthPart(house); // modifies 'house'!
00236 
00237   /* Use a pointer for the tile to start the search. Will be required for calculating the distance*/
00238   if (CircularTileSearch(&found_tile, 2 * searchradius + 1, search_procs[searchtype], &nbhd)) {
00239     return DistanceManhattan(found_tile, tile);
00240   }
00241   return 0;
00242 }
00243 
00249 static uint32 HouseGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
00250 {
00251   const Town *town = object->u.house.town;
00252   TileIndex tile   = object->u.house.tile;
00253   HouseID house_id = object->u.house.house_id;
00254 
00255   if (object->scope == VSG_SCOPE_PARENT) {
00256     return TownGetVariable(variable, parameter, available, town);
00257   }
00258 
00259   switch (variable) {
00260     /* Construction stage. */
00261     case 0x40: return (IsTileType(tile, MP_HOUSE) ? GetHouseBuildingStage(tile) : 0) | TileHash2Bit(TileX(tile), TileY(tile)) << 2;
00262 
00263     /* Building age. */
00264     case 0x41: return IsTileType(tile, MP_HOUSE) ? GetHouseAge(tile) : 0;
00265 
00266     /* Town zone */
00267     case 0x42: return GetTownRadiusGroup(town, tile);
00268 
00269     /* Terrain type */
00270     case 0x43: return GetTerrainType(tile);
00271 
00272     /* Number of this type of building on the map. */
00273     case 0x44: return GetNumHouses(house_id, town);
00274 
00275     /* Whether the town is being created or just expanded. */
00276     case 0x45: return _generating_world ? 1 : 0;
00277 
00278     /* Current animation frame. */
00279     case 0x46: return IsTileType(tile, MP_HOUSE) ? GetHouseAnimationFrame(tile) : 0;
00280 
00281     /* Position of the house */
00282     case 0x47: return TileY(tile) << 16 | TileX(tile);
00283 
00284     /* Building counts for old houses with id = parameter. */
00285     case 0x60: return GetNumHouses(parameter, town);
00286 
00287     /* Building counts for new houses with id = parameter. */
00288     case 0x61: {
00289       const HouseSpec *hs = HouseSpec::Get(house_id);
00290       if (hs->grffile == NULL) return 0;
00291 
00292       HouseID new_house = _house_mngr.GetID(parameter, hs->grffile->grfid);
00293       return new_house == INVALID_HOUSE_ID ? 0 : GetNumHouses(new_house, town);
00294     }
00295 
00296     /* Land info for nearby tiles. */
00297     case 0x62: return GetNearbyTileInformation(parameter, tile);
00298 
00299     /* Current animation frame of nearby house tiles */
00300     case 0x63: {
00301       TileIndex testtile = GetNearbyTile(parameter, tile);
00302       return IsTileType(testtile, MP_HOUSE) ? GetHouseAnimationFrame(testtile) : 0;
00303     }
00304 
00305     /* Cargo acceptance history of nearby stations */
00306     /*case 0x64: not implemented yet */
00307 
00308     /* Distance test for some house types */
00309     case 0x65: return GetDistanceFromNearbyHouse(parameter, tile, object->u.house.house_id);
00310 
00311     /* Class and ID of nearby house tile */
00312     case 0x66: {
00313       TileIndex testtile = GetNearbyTile(parameter, tile);
00314       if (!IsTileType(testtile, MP_HOUSE)) return 0xFFFFFFFF;
00315       HouseSpec *hs = HouseSpec::Get(GetHouseType(testtile));
00316       /* Information about the grf local classid if the house has a class */
00317       uint houseclass = 0;
00318       if (hs->class_id != HOUSE_NO_CLASS) {
00319         houseclass = (hs->grffile == object->grffile ? 1 : 2) << 8;
00320         houseclass |= _class_mapping[hs->class_id].class_id;
00321       }
00322       /* old house type or grf-local houseid */
00323       uint local_houseid = 0;
00324       if (house_id < NEW_HOUSE_OFFSET) {
00325         local_houseid = house_id;
00326       } else {
00327         local_houseid = (hs->grffile == object->grffile ? 1 : 2) << 8;
00328         local_houseid |= hs->local_id;
00329       }
00330       return houseclass << 16 | local_houseid;
00331     }
00332 
00333     /* GRFID of nearby house tile */
00334     case 0x67: {
00335       TileIndex testtile = GetNearbyTile(parameter, tile);
00336       if (!IsTileType(testtile, MP_HOUSE)) return 0xFFFFFFFF;
00337       HouseID house_id = GetHouseType(testtile);
00338       if (house_id < NEW_HOUSE_OFFSET) return 0;
00339       /* Checking the grffile information via HouseSpec doesn't work
00340        * in case the newgrf was removed. */
00341       return _house_mngr.mapping_ID[house_id].grfid;
00342     }
00343   }
00344 
00345   DEBUG(grf, 1, "Unhandled house property 0x%X", variable);
00346 
00347   *available = false;
00348   return UINT_MAX;
00349 }
00350 
00351 static const SpriteGroup *HouseResolveReal(const ResolverObject *object, const RealSpriteGroup *group)
00352 {
00353   /* Houses do not have 'real' groups */
00354   return NULL;
00355 }
00356 
00362 static void NewHouseResolver(ResolverObject *res, HouseID house_id, TileIndex tile, Town *town)
00363 {
00364   res->GetRandomBits = HouseGetRandomBits;
00365   res->GetTriggers   = HouseGetTriggers;
00366   res->SetTriggers   = HouseSetTriggers;
00367   res->GetVariable   = HouseGetVariable;
00368   res->ResolveReal   = HouseResolveReal;
00369 
00370   res->u.house.tile     = tile;
00371   res->u.house.town     = town;
00372   res->u.house.house_id = house_id;
00373 
00374   res->callback        = CBID_NO_CALLBACK;
00375   res->callback_param1 = 0;
00376   res->callback_param2 = 0;
00377   res->last_value      = 0;
00378   res->trigger         = 0;
00379   res->reseed          = 0;
00380   res->count           = 0;
00381 
00382   const HouseSpec *hs = HouseSpec::Get(house_id);
00383   res->grffile         = (hs != NULL ? hs->grffile : NULL);
00384 }
00385 
00386 uint16 GetHouseCallback(CallbackID callback, uint32 param1, uint32 param2, HouseID house_id, Town *town, TileIndex tile)
00387 {
00388   ResolverObject object;
00389   const SpriteGroup *group;
00390 
00391   NewHouseResolver(&object, house_id, tile, town);
00392   object.callback = callback;
00393   object.callback_param1 = param1;
00394   object.callback_param2 = param2;
00395 
00396   group = SpriteGroup::Resolve(HouseSpec::Get(house_id)->spritegroup, &object);
00397   if (group == NULL) return CALLBACK_FAILED;
00398 
00399   return group->GetCallbackResult();
00400 }
00401 
00402 static void DrawTileLayout(const TileInfo *ti, const TileLayoutSpriteGroup *group, byte stage, HouseID house_id)
00403 {
00404   const DrawTileSprites *dts = group->dts;
00405 
00406   const HouseSpec *hs = HouseSpec::Get(house_id);
00407   PaletteID palette = hs->random_colour[TileHash2Bit(ti->x, ti->y)] + PALETTE_RECOLOUR_START;
00408   if (HasBit(hs->callback_mask, CBM_HOUSE_COLOUR)) {
00409     uint16 callback = GetHouseCallback(CBID_HOUSE_COLOUR, 0, 0, house_id, Town::GetByTile(ti->tile), ti->tile);
00410     if (callback != CALLBACK_FAILED) {
00411       /* If bit 14 is set, we should use a 2cc colour map, else use the callback value. */
00412       palette = HasBit(callback, 14) ? GB(callback, 0, 8) + SPR_2CCMAP_BASE : callback;
00413     }
00414   }
00415 
00416   SpriteID image = dts->ground.sprite;
00417   PaletteID pal  = dts->ground.pal;
00418 
00419   if (HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE)) image += stage;
00420 
00421   if (GB(image, 0, SPRITE_WIDTH) != 0) {
00422     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, palette));
00423   }
00424 
00425   DrawNewGRFTileSeq(ti, dts, TO_HOUSES, stage, palette);
00426 }
00427 
00428 void DrawNewHouseTile(TileInfo *ti, HouseID house_id)
00429 {
00430   const HouseSpec *hs = HouseSpec::Get(house_id);
00431   const SpriteGroup *group;
00432   ResolverObject object;
00433 
00434   if (ti->tileh != SLOPE_FLAT) {
00435     bool draw_old_one = true;
00436     if (HasBit(hs->callback_mask, CBM_HOUSE_DRAW_FOUNDATIONS)) {
00437       /* Called to determine the type (if any) of foundation to draw for the house tile */
00438       uint32 callback_res = GetHouseCallback(CBID_HOUSE_DRAW_FOUNDATIONS, 0, 0, house_id, Town::GetByTile(ti->tile), ti->tile);
00439       draw_old_one = (callback_res != 0);
00440     }
00441 
00442     if (draw_old_one) DrawFoundation(ti, FOUNDATION_LEVELED);
00443   }
00444 
00445   NewHouseResolver(&object, house_id, ti->tile, Town::GetByTile(ti->tile));
00446 
00447   group = SpriteGroup::Resolve(hs->spritegroup, &object);
00448   if (group == NULL || group->type != SGT_TILELAYOUT) {
00449     return;
00450   } else {
00451     /* Limit the building stage to the number of stages supplied. */
00452     const TileLayoutSpriteGroup *tlgroup = (const TileLayoutSpriteGroup *)group;
00453     byte stage = GetHouseBuildingStage(ti->tile);
00454     stage = Clamp(stage - 4 + tlgroup->num_building_stages, 0, tlgroup->num_building_stages - 1);
00455     DrawTileLayout(ti, tlgroup, stage, house_id);
00456   }
00457 }
00458 
00459 void AnimateNewHouseTile(TileIndex tile)
00460 {
00461   const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
00462   byte animation_speed = hs->animation_speed;
00463   bool frame_set_by_callback = false;
00464 
00465   if (HasBit(hs->callback_mask, CBM_HOUSE_ANIMATION_SPEED)) {
00466     uint16 callback_res = GetHouseCallback(CBID_HOUSE_ANIMATION_SPEED, 0, 0, GetHouseType(tile), Town::GetByTile(tile), tile);
00467     if (callback_res != CALLBACK_FAILED) animation_speed = Clamp(callback_res & 0xFF, 2, 16);
00468   }
00469 
00470   /* An animation speed of 2 means the animation frame changes 4 ticks, and
00471    * increasing this value by one doubles the wait. 2 is the minimum value
00472    * allowed for animation_speed, which corresponds to 120ms, and 16 is the
00473    * maximum, corresponding to around 33 minutes. */
00474   if (_tick_counter % (1 << animation_speed) != 0) return;
00475 
00476   byte frame      = GetHouseAnimationFrame(tile);
00477   byte num_frames = GB(hs->animation_frames, 0, 7);
00478 
00479   if (HasBit(hs->callback_mask, CBM_HOUSE_ANIMATION_NEXT_FRAME)) {
00480     uint32 param = (hs->extra_flags & CALLBACK_1A_RANDOM_BITS) ? Random() : 0;
00481     uint16 callback_res = GetHouseCallback(CBID_HOUSE_ANIMATION_NEXT_FRAME, param, 0, GetHouseType(tile), Town::GetByTile(tile), tile);
00482 
00483     if (callback_res != CALLBACK_FAILED) {
00484       frame_set_by_callback = true;
00485 
00486       switch (callback_res & 0xFF) {
00487         case 0xFF:
00488           DeleteAnimatedTile(tile);
00489           break;
00490         case 0xFE:
00491           /* Carry on as normal. */
00492           frame_set_by_callback = false;
00493           break;
00494         default:
00495           frame = callback_res & 0xFF;
00496           break;
00497       }
00498 
00499       /* If the lower 7 bits of the upper byte of the callback
00500        * result are not empty, it is a sound effect. */
00501       if (GB(callback_res, 8, 7) != 0) PlayTileSound(hs->grffile, GB(callback_res, 8, 7), tile);
00502     }
00503   }
00504 
00505   if (!frame_set_by_callback) {
00506     if (frame < num_frames) {
00507       frame++;
00508     } else if (frame == num_frames && HasBit(hs->animation_frames, 7)) {
00509       /* This animation loops, so start again from the beginning */
00510       frame = 0;
00511     } else {
00512       /* This animation doesn't loop, so stay here */
00513       DeleteAnimatedTile(tile);
00514     }
00515   }
00516 
00517   SetHouseAnimationFrame(tile, frame);
00518   MarkTileDirtyByTile(tile);
00519 }
00520 
00521 void ChangeHouseAnimationFrame(const GRFFile *file, TileIndex tile, uint16 callback_result)
00522 {
00523   switch (callback_result & 0xFF) {
00524     case 0xFD: /* Do nothing. */         break;
00525     case 0xFE: AddAnimatedTile(tile);    break;
00526     case 0xFF: DeleteAnimatedTile(tile); break;
00527     default:
00528       SetHouseAnimationFrame(tile, callback_result & 0xFF);
00529       AddAnimatedTile(tile);
00530       break;
00531   }
00532   /* If the lower 7 bits of the upper byte of the callback
00533    * result are not empty, it is a sound effect. */
00534   if (GB(callback_result, 8, 7) != 0) PlayTileSound(file, GB(callback_result, 8, 7), tile);
00535 }
00536 
00537 bool CanDeleteHouse(TileIndex tile)
00538 {
00539   const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
00540 
00541   /* Humans are always allowed to remove buildings, as is water and
00542    * anyone using the scenario editor. */
00543   if (Company::IsValidHumanID(_current_company) || _current_company == OWNER_WATER || _current_company == OWNER_NONE) {
00544     return true;
00545   }
00546 
00547   if (HasBit(hs->callback_mask, CBM_HOUSE_DENY_DESTRUCTION)) {
00548     uint16 callback_res = GetHouseCallback(CBID_HOUSE_DENY_DESTRUCTION, 0, 0, GetHouseType(tile), Town::GetByTile(tile), tile);
00549     return (callback_res == CALLBACK_FAILED || callback_res == 0);
00550   } else {
00551     return !(hs->extra_flags & BUILDING_IS_PROTECTED);
00552   }
00553 }
00554 
00555 static void AnimationControl(TileIndex tile, uint16 random_bits)
00556 {
00557   const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
00558 
00559   if (HasBit(hs->callback_mask, CBM_HOUSE_ANIMATION_START_STOP)) {
00560     uint32 param = (hs->extra_flags & SYNCHRONISED_CALLBACK_1B) ? (GB(Random(), 0, 16) | random_bits << 16) : Random();
00561     uint16 callback_res = GetHouseCallback(CBID_HOUSE_ANIMATION_START_STOP, param, 0, GetHouseType(tile), Town::GetByTile(tile), tile);
00562 
00563     if (callback_res != CALLBACK_FAILED) ChangeHouseAnimationFrame(hs->grffile, tile, callback_res);
00564   }
00565 }
00566 
00567 bool NewHouseTileLoop(TileIndex tile)
00568 {
00569   const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
00570 
00571   if (GetHouseProcessingTime(tile) > 0) {
00572     DecHouseProcessingTime(tile);
00573     return true;
00574   }
00575 
00576   TriggerHouse(tile, HOUSE_TRIGGER_TILE_LOOP);
00577   if (hs->building_flags & BUILDING_HAS_1_TILE) TriggerHouse(tile, HOUSE_TRIGGER_TILE_LOOP_TOP);
00578 
00579   if (HasBit(hs->callback_mask, CBM_HOUSE_ANIMATION_START_STOP)) {
00580     /* If this house is marked as having a synchronised callback, all the
00581      * tiles will have the callback called at once, rather than when the
00582      * tile loop reaches them. This should only be enabled for the northern
00583      * tile, or strange things will happen (here, and in TTDPatch). */
00584     if (hs->extra_flags & SYNCHRONISED_CALLBACK_1B) {
00585       uint16 random = GB(Random(), 0, 16);
00586 
00587       if (hs->building_flags & BUILDING_HAS_1_TILE)  AnimationControl(tile, random);
00588       if (hs->building_flags & BUILDING_2_TILES_Y)   AnimationControl(TILE_ADDXY(tile, 0, 1), random);
00589       if (hs->building_flags & BUILDING_2_TILES_X)   AnimationControl(TILE_ADDXY(tile, 1, 0), random);
00590       if (hs->building_flags & BUILDING_HAS_4_TILES) AnimationControl(TILE_ADDXY(tile, 1, 1), random);
00591     } else {
00592       AnimationControl(tile, 0);
00593     }
00594   }
00595 
00596   /* Check callback 21, which determines if a house should be destroyed. */
00597   if (HasBit(hs->callback_mask, CBM_HOUSE_DESTRUCTION)) {
00598     uint16 callback_res = GetHouseCallback(CBID_HOUSE_DESTRUCTION, 0, 0, GetHouseType(tile), Town::GetByTile(tile), tile);
00599     if (callback_res != CALLBACK_FAILED && GB(callback_res, 0, 8) > 0) {
00600       ClearTownHouse(Town::GetByTile(tile), tile);
00601       return false;
00602     }
00603   }
00604 
00605   SetHouseProcessingTime(tile, hs->processing_time);
00606   MarkTileDirtyByTile(tile);
00607   return true;
00608 }
00609 
00610 static void DoTriggerHouse(TileIndex tile, HouseTrigger trigger, byte base_random, bool first)
00611 {
00612   ResolverObject object;
00613 
00614   /* We can't trigger a non-existent building... */
00615   assert(IsTileType(tile, MP_HOUSE));
00616 
00617   HouseID hid = GetHouseType(tile);
00618   HouseSpec *hs = HouseSpec::Get(hid);
00619 
00620   if (hs->spritegroup == NULL) return;
00621 
00622   NewHouseResolver(&object, hid, tile, Town::GetByTile(tile));
00623 
00624   object.callback = CBID_RANDOM_TRIGGER;
00625   object.trigger = trigger;
00626 
00627   const SpriteGroup *group = SpriteGroup::Resolve(hs->spritegroup, &object);
00628   if (group == NULL) return;
00629 
00630   byte new_random_bits = Random();
00631   byte random_bits = GetHouseRandomBits(tile);
00632   random_bits &= ~object.reseed;
00633   random_bits |= (first ? new_random_bits : base_random) & object.reseed;
00634   SetHouseRandomBits(tile, random_bits);
00635 
00636   switch (trigger) {
00637     case HOUSE_TRIGGER_TILE_LOOP:
00638       /* Random value already set. */
00639       break;
00640 
00641     case HOUSE_TRIGGER_TILE_LOOP_TOP:
00642       if (!first) {
00643         /* The top tile is marked dirty by the usual TileLoop */
00644         MarkTileDirtyByTile(tile);
00645         break;
00646       }
00647       /* Random value of first tile already set. */
00648       if (hs->building_flags & BUILDING_2_TILES_Y)   DoTriggerHouse(TILE_ADDXY(tile, 0, 1), trigger, random_bits, false);
00649       if (hs->building_flags & BUILDING_2_TILES_X)   DoTriggerHouse(TILE_ADDXY(tile, 1, 0), trigger, random_bits, false);
00650       if (hs->building_flags & BUILDING_HAS_4_TILES) DoTriggerHouse(TILE_ADDXY(tile, 1, 1), trigger, random_bits, false);
00651       break;
00652   }
00653 }
00654 
00655 void TriggerHouse(TileIndex t, HouseTrigger trigger)
00656 {
00657   DoTriggerHouse(t, trigger, 0, true);
00658 }

Generated on Thu Feb 4 17:20:26 2010 for OpenTTD by  doxygen 1.5.6