src/newgrf_station.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_station.cpp Functions for dealing with station classes and custom stations. */
  11
  12 #include "stdafx.h"
  13 #include "debug.h"
  14 #include "station_base.h"
  15 #include "waypoint_base.h"
  16 #include "roadstop_base.h"
  17 #include "newgrf_cargo.h"
  18 #include "newgrf_station.h"
  19 #include "newgrf_spritegroup.h"
  20 #include "newgrf_sound.h"
  21 #include "newgrf_railtype.h"
  22 #include "town.h"
  23 #include "newgrf_town.h"
  24 #include "company_func.h"
  25 #include "tunnelbridge_map.h"
  26 #include "newgrf_animation_base.h"
  27 #include "newgrf_class_func.h"
  28
  29 #include "safeguards.h"
  30
  31
  32 template <typename Tspec, typename Tid, Tid Tmax>
  33 /* static */ void NewGRFClass<Tspec, Tid, Tmax>::InsertDefaults()
  34 {
  35         /* Set up initial data */
  36         classes[0].global_id = 'DFLT';
  37         classes[0].name = STR_STATION_CLASS_DFLT;
  38         classes[0].Insert(NULL);
  39
  40         classes[1].global_id = 'WAYP';
  41         classes[1].name = STR_STATION_CLASS_WAYP;
  42         classes[1].Insert(NULL);
  43 }
  44
  45 template <typename Tspec, typename Tid, Tid Tmax>
  46 bool NewGRFClass<Tspec, Tid, Tmax>::IsUIAvailable(uint index) const
  47 {
  48         return true;
  49 }
  50
  51 INSTANTIATE_NEWGRF_CLASS_METHODS(StationClass, StationSpec, StationClassID, STAT_CLASS_MAX)
  52
  53 static const uint NUM_STATIONSSPECS_PER_STATION = 255; ///< Maximum number of parts per station.
  54
  55 enum TriggerArea {
  56         TA_TILE,
  57         TA_PLATFORM,
  58         TA_WHOLE,
  59 };
  60
  61 struct ETileArea : TileArea {
  62         ETileArea(const BaseStation *st, TileIndex tile, TriggerArea ta)
  63         {
  64                 switch (ta) {
  65                         default: NOT_REACHED();
  66
  67                         case TA_TILE:
  68                                 this->tile = tile;
  69                                 this->w    = 1;
  70                                 this->h    = 1;
  71                                 break;
  72
  73                         case TA_PLATFORM: {
  74                                 TileIndex start, end;
  75                                 Axis axis = GetRailStationAxis(tile);
  76                                 TileIndexDiff delta = TileOffsByDiagDir(AxisToDiagDir(axis));
  77
  78                                 for (end = tile; IsRailStationTile(end + delta) && IsCompatibleTrainStationTile(end + delta, tile); end += delta) { /* Nothing */ }
  79                                 for (start = tile; IsRailStationTile(start - delta) && IsCompatibleTrainStationTile(start - delta, tile); start -= delta) { /* Nothing */ }
  80
  81                                 this->tile = start;
  82                                 this->w = TileX(end) - TileX(start) + 1;
  83                                 this->h = TileY(end) - TileY(start) + 1;
  84                                 break;
  85                         }
  86
  87                         case TA_WHOLE:
  88                                 st->GetTileArea(this, Station::IsExpected(st) ? STATION_RAIL : STATION_WAYPOINT);
  89                                 break;
  90                 }
  91         }
  92 };
  93
  94
  95 /**
  96  * Evaluate a tile's position within a station, and return the result in a bit-stuffed format.
  97  * if not centered: .TNLcCpP, if centered: .TNL..CP
  98  * - T = Tile layout number (#GetStationGfx)
  99  * - N = Number of platforms
 100  * - L = Length of platforms
 101  * - C = Current platform number from start, c = from end
 102  * - P = Position along platform from start, p = from end
 103  * .
 104  * if centered, C/P start from the centre and c/p are not available.
 105  * @return Platform information in bit-stuffed format.
 106  */
 107 uint32 GetPlatformInfo(Axis axis, byte tile, int platforms, int length, int x, int y, bool centred)
 108 {
 109         uint32 retval = 0;
 110
 111         if (axis == AXIS_X) {
 112                 Swap(platforms, length);
 113                 Swap(x, y);
 114         }
 115
 116         if (centred) {
 117                 x -= platforms / 2;
 118                 y -= length / 2;
 119                 x = Clamp(x, -8, 7);
 120                 y = Clamp(y, -8, 7);
 121                 SB(retval,  0, 4, y & 0xF);
 122                 SB(retval,  4, 4, x & 0xF);
 123         } else {
 124                 SB(retval,  0, 4, min(15, y));
 125                 SB(retval,  4, 4, min(15, length - y - 1));
 126                 SB(retval,  8, 4, min(15, x));
 127                 SB(retval, 12, 4, min(15, platforms - x - 1));
 128         }
 129         SB(retval, 16, 4, min(15, length));
 130         SB(retval, 20, 4, min(15, platforms));
 131         SB(retval, 24, 4, tile);
 132
 133         return retval;
 134 }
 135
 136
 137 /**
 138  * Find the end of a railway station, from the \a tile, in the direction of \a delta.
 139  * @param tile Start tile.
 140  * @param delta Movement direction.
 141  * @param check_type Stop when the custom station type changes.
 142  * @param check_axis Stop when the station direction changes.
 143  * @return Found end of the railway station.
 144  */
 145 static TileIndex FindRailStationEnd(TileIndex tile, TileIndexDiff delta, bool check_type, bool check_axis)
 146 {
 147         byte orig_type = 0;
 148         Axis orig_axis = AXIS_X;
 149         StationID sid = GetStationIndex(tile);
 150
 151         if (check_type) orig_type = GetCustomStationSpecIndex(tile);
 152         if (check_axis) orig_axis = GetRailStationAxis(tile);
 153
 154         for (;;) {
 155                 TileIndex new_tile = TILE_ADD(tile, delta);
 156
 157                 if (!IsTileType(new_tile, MP_STATION) || GetStationIndex(new_tile) != sid) break;
 158                 if (!HasStationRail(new_tile)) break;
 159                 if (check_type && GetCustomStationSpecIndex(new_tile) != orig_type) break;
 160                 if (check_axis && GetRailStationAxis(new_tile) != orig_axis) break;
 161
 162                 tile = new_tile;
 163         }
 164         return tile;
 165 }
 166
 167
 168 static uint32 GetPlatformInfoHelper(TileIndex tile, bool check_type, bool check_axis, bool centred)
 169 {
 170         int tx = TileX(tile);
 171         int ty = TileY(tile);
 172         int sx = TileX(FindRailStationEnd(tile, TileDiffXY(-1,  0), check_type, check_axis));
 173         int sy = TileY(FindRailStationEnd(tile, TileDiffXY( 0, -1), check_type, check_axis));
 174         int ex = TileX(FindRailStationEnd(tile, TileDiffXY( 1,  0), check_type, check_axis)) + 1;
 175         int ey = TileY(FindRailStationEnd(tile, TileDiffXY( 0,  1), check_type, check_axis)) + 1;
 176
 177         tx -= sx; ex -= sx;
 178         ty -= sy; ey -= sy;
 179
 180         return GetPlatformInfo(GetRailStationAxis(tile), GetStationGfx(tile), ex, ey, tx, ty, centred);
 181 }
 182
 183
 184 static uint32 GetRailContinuationInfo(TileIndex tile)
 185 {
 186         /* Tile offsets and exit dirs for X axis */
 187         static const Direction x_dir[8] = { DIR_SW, DIR_NE, DIR_SE, DIR_NW, DIR_S, DIR_E, DIR_W, DIR_N };
 188         static const DiagDirection x_exits[8] = { DIAGDIR_SW, DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_NW, DIAGDIR_SW, DIAGDIR_NE, DIAGDIR_SW, DIAGDIR_NE };
 189
 190         /* Tile offsets and exit dirs for Y axis */
 191         static const Direction y_dir[8] = { DIR_SE, DIR_NW, DIR_SW, DIR_NE, DIR_S, DIR_W, DIR_E, DIR_N };
 192         static const DiagDirection y_exits[8] = { DIAGDIR_SE, DIAGDIR_NW, DIAGDIR_SW, DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_NW, DIAGDIR_SE, DIAGDIR_NW };
 193
 194         Axis axis = GetRailStationAxis(tile);
 195
 196         /* Choose appropriate lookup table to use */
 197         const Direction *dir = axis == AXIS_X ? x_dir : y_dir;
 198         const DiagDirection *diagdir = axis == AXIS_X ? x_exits : y_exits;
 199
 200         uint32 res = 0;
 201         uint i;
 202
 203         for (i = 0; i < lengthof(x_dir); i++, dir++, diagdir++) {
 204                 TileIndex neighbour_tile = tile + TileOffsByDir(*dir);
 205                 TrackBits trackbits = TrackStatusToTrackBits(GetTileTrackStatus(neighbour_tile, TRANSPORT_RAIL, 0));
 206                 if (trackbits != TRACK_BIT_NONE) {
 207                         /* If there is any track on the tile, set the bit in the second byte */
 208                         SetBit(res, i + 8);
 209
 210                         /* With tunnels and bridges the tile has tracks, but they are not necessarily connected
 211                          * with the next tile because the ramp is not going in the right direction. */
 212                         if (IsTileType(neighbour_tile, MP_TUNNELBRIDGE) && GetTunnelBridgeDirection(neighbour_tile) != *diagdir) {
 213                                 continue;
 214                         }
 215
 216                         /* If any track reaches our exit direction, set the bit in the lower byte */
 217                         if (trackbits & DiagdirReachesTracks(*diagdir)) SetBit(res, i);
 218                 }
 219         }
 220
 221         return res;
 222 }
 223
 224
 225 /* Station Resolver Functions */
 226 /* virtual */ uint32 StationScopeResolver::GetRandomBits() const
 227 {
 228         return (this->st == NULL ? 0 : this->st->random_bits) | (this->tile == INVALID_TILE ? 0 : GetStationTileRandomBits(this->tile) << 16);
 229 }
 230
 231
 232 /* virtual */ uint32 StationScopeResolver::GetTriggers() const
 233 {
 234         return this->st == NULL ? 0 : this->st->waiting_triggers;
 235 }
 236
 237
 238 /* virtual */ void StationScopeResolver::SetTriggers(int triggers) const
 239 {
 240         BaseStation *st = const_cast<BaseStation *>(this->st);
 241         assert(st != NULL);
 242         st->waiting_triggers = triggers;
 243 }
 244
 245 /**
 246  * Station variable cache
 247  * This caches 'expensive' station variable lookups which iterate over
 248  * several tiles that may be called multiple times per Resolve().
 249  */
 250 static struct {
 251         uint32 v40;
 252         uint32 v41;
 253         uint32 v45;
 254         uint32 v46;
 255         uint32 v47;
 256         uint32 v49;
 257         uint8 valid; ///< Bits indicating what variable is valid (for each bit, \c 0 is invalid, \c 1 is valid).
 258 } _svc;
 259
 260 /**
 261  * Get the town scope associated with a station, if it exists.
 262  * On the first call, the town scope is created (if possible).
 263  * @return Town scope, if available.
 264  */
 265 TownScopeResolver *StationResolverObject::GetTown()
 266 {
 267         if (this->town_scope == NULL) {
 268                 Town *t = NULL;
 269                 if (this->station_scope.st != NULL) {
 270                         t = this->station_scope.st->town;
 271                 } else if (this->station_scope.tile != INVALID_TILE) {
 272                         t = ClosestTownFromTile(this->station_scope.tile, UINT_MAX);
 273                 }
 274                 if (t == NULL) return NULL;
 275                 this->town_scope = new TownScopeResolver(*this, t, this->station_scope.st == NULL);
 276         }
 277         return this->town_scope;
 278 }
 279
 280 /* virtual */ uint32 StationScopeResolver::GetVariable(byte variable, uint32 parameter, bool *available) const
 281 {
 282         if (this->st == NULL) {
 283                 /* Station does not exist, so we're in a purchase list or the land slope check callback. */
 284                 switch (variable) {
 285                         case 0x40:
 286                         case 0x41:
 287                         case 0x46:
 288                         case 0x47:
 289                         case 0x49: return 0x2110000;        // Platforms, tracks & position
 290                         case 0x42: return 0;                // Rail type (XXX Get current type from GUI?)
 291                         case 0x43: return GetCompanyInfo(_current_company); // Station owner
 292                         case 0x44: return 2;                // PBS status
 293                         case 0x67: // Land info of nearby tile
 294                                 if (this->axis != INVALID_AXIS && this->tile != INVALID_TILE) {
 295                                         TileIndex tile = this->tile;
 296                                         if (parameter != 0) tile = GetNearbyTile(parameter, tile, true, this->axis); // only perform if it is required
 297
 298                                         Slope tileh = GetTileSlope(tile);
 299                                         bool swap = (this->axis == AXIS_Y && HasBit(tileh, CORNER_W) != HasBit(tileh, CORNER_E));
 300
 301                                         return GetNearbyTileInformation(tile, this->ro.grffile->grf_version >= 8) ^ (swap ? SLOPE_EW : 0);
 302                                 }
 303                                 break;
 304
 305                         case 0xFA: return Clamp(_date - DAYS_TILL_ORIGINAL_BASE_YEAR, 0, 65535); // Build date, clamped to a 16 bit value
 306                 }
 307
 308                 *available = false;
 309                 return UINT_MAX;
 310         }
 311
 312         switch (variable) {
 313                 /* Calculated station variables */
 314                 case 0x40:
 315                         if (!HasBit(_svc.valid, 0)) { _svc.v40 = GetPlatformInfoHelper(this->tile, false, false, false); SetBit(_svc.valid, 0); }
 316                         return _svc.v40;
 317
 318                 case 0x41:
 319                         if (!HasBit(_svc.valid, 1)) { _svc.v41 = GetPlatformInfoHelper(this->tile, true,  false, false); SetBit(_svc.valid, 1); }
 320                         return _svc.v41;
 321
 322                 case 0x42: return GetTerrainType(this->tile) | (GetReverseRailTypeTranslation(GetRailType(this->tile), this->statspec->grf_prop.grffile) << 8);
 323                 case 0x43: return GetCompanyInfo(this->st->owner); // Station owner
 324                 case 0x44: return HasStationReservation(this->tile) ? 7 : 4; // PBS status
 325                 case 0x45:
 326                         if (!HasBit(_svc.valid, 2)) { _svc.v45 = GetRailContinuationInfo(this->tile); SetBit(_svc.valid, 2); }
 327                         return _svc.v45;
 328
 329                 case 0x46:
 330                         if (!HasBit(_svc.valid, 3)) { _svc.v46 = GetPlatformInfoHelper(this->tile, false, false, true); SetBit(_svc.valid, 3); }
 331                         return _svc.v46;
 332
 333                 case 0x47:
 334                         if (!HasBit(_svc.valid, 4)) { _svc.v47 = GetPlatformInfoHelper(this->tile, true,  false, true); SetBit(_svc.valid, 4); }
 335                         return _svc.v47;
 336
 337                 case 0x49:
 338                         if (!HasBit(_svc.valid, 5)) { _svc.v49 = GetPlatformInfoHelper(this->tile, false, true, false); SetBit(_svc.valid, 5); }
 339                         return _svc.v49;
 340
 341                 case 0x4A: // Animation frame of tile
 342                         return GetAnimationFrame(this->tile);
 343
 344                 /* Variables which use the parameter */
 345                 /* Variables 0x60 to 0x65 and 0x69 are handled separately below */
 346                 case 0x66: { // Animation frame of nearby tile
 347                         TileIndex tile = this->tile;
 348                         if (parameter != 0) tile = GetNearbyTile(parameter, tile);
 349                         return this->st->TileBelongsToRailStation(tile) ? GetAnimationFrame(tile) : UINT_MAX;
 350                 }
 351
 352                 case 0x67: { // Land info of nearby tile
 353                         Axis axis = GetRailStationAxis(this->tile);
 354                         TileIndex tile = this->tile;
 355                         if (parameter != 0) tile = GetNearbyTile(parameter, tile); // only perform if it is required
 356
 357                         Slope tileh = GetTileSlope(tile);
 358                         bool swap = (axis == AXIS_Y && HasBit(tileh, CORNER_W) != HasBit(tileh, CORNER_E));
 359
 360                         return GetNearbyTileInformation(tile, this->ro.grffile->grf_version >= 8) ^ (swap ? SLOPE_EW : 0);
 361                 }
 362
 363                 case 0x68: { // Station info of nearby tiles
 364                         TileIndex nearby_tile = GetNearbyTile(parameter, this->tile);
 365
 366                         if (!HasStationTileRail(nearby_tile)) return 0xFFFFFFFF;
 367
 368                         uint32 grfid = this->st->speclist[GetCustomStationSpecIndex(this->tile)].grfid;
 369                         bool perpendicular = GetRailStationAxis(this->tile) != GetRailStationAxis(nearby_tile);
 370                         bool same_station = this->st->TileBelongsToRailStation(nearby_tile);
 371                         uint32 res = GB(GetStationGfx(nearby_tile), 1, 2) << 12 | !!perpendicular << 11 | !!same_station << 10;
 372
 373                         if (IsCustomStationSpecIndex(nearby_tile)) {
 374                                 const StationSpecList ssl = BaseStation::GetByTile(nearby_tile)->speclist[GetCustomStationSpecIndex(nearby_tile)];
 375                                 res |= 1 << (ssl.grfid != grfid ? 9 : 8) | ssl.localidx;
 376                         }
 377                         return res;
 378                 }
 379
 380                 /* General station variables */
 381                 case 0x82: return 50;
 382                 case 0x84: return this->st->string_id;
 383                 case 0x86: return 0;
 384                 case 0xF0: return this->st->facilities;
 385                 case 0xFA: return Clamp(this->st->build_date - DAYS_TILL_ORIGINAL_BASE_YEAR, 0, 65535);
 386         }
 387
 388         return this->st->GetNewGRFVariable(this->ro, variable, parameter, available);
 389 }
 390
 391 uint32 Station::GetNewGRFVariable(const ResolverObject &object, byte variable, byte parameter, bool *available) const
 392 {
 393         switch (variable) {
 394                 case 0x48: { // Accepted cargo types
 395                         CargoID cargo_type;
 396                         uint32 value = 0;
 397
 398                         for (cargo_type = 0; cargo_type < NUM_CARGO; cargo_type++) {
 399                                 if (HasBit(this->goods[cargo_type].status, GoodsEntry::GES_ACCEPTANCE)) SetBit(value, cargo_type);
 400                         }
 401                         return value;
 402                 }
 403
 404                 case 0x8A: return this->had_vehicle_of_type;
 405                 case 0xF1: return (this->airport.tile != INVALID_TILE) ? this->airport.GetSpec()->ttd_airport_type : ATP_TTDP_LARGE;
 406                 case 0xF2: return (this->truck_stops != NULL) ? this->truck_stops->status : 0;
 407                 case 0xF3: return (this->bus_stops != NULL)   ? this->bus_stops->status   : 0;
 408                 case 0xF6: return this->airport.flags;
 409                 case 0xF7: return GB(this->airport.flags, 8, 8);
 410         }
 411
 412         /* Handle cargo variables with parameter, 0x60 to 0x65 and 0x69 */
 413         if ((variable >= 0x60 && variable <= 0x65) || variable == 0x69) {
 414                 CargoID c = GetCargoTranslation(parameter, object.grffile);
 415
 416                 if (c == CT_INVALID) {
 417                         switch (variable) {
 418                                 case 0x62: return 0xFFFFFFFF;
 419                                 case 0x64: return 0xFF00;
 420                                 default:   return 0;
 421                         }
 422                 }
 423                 const GoodsEntry *ge = &this->goods[c];
 424
 425                 switch (variable) {
 426                         case 0x60: return min(ge->cargo.TotalCount(), 4095);
 427                         case 0x61: return ge->HasVehicleEverTriedLoading() ? ge->time_since_pickup : 0;
 428                         case 0x62: return ge->HasRating() ? ge->rating : 0xFFFFFFFF;
 429                         case 0x63: return ge->cargo.DaysInTransit();
 430                         case 0x64: return ge->HasVehicleEverTriedLoading() ? ge->last_speed | (ge->last_age << 8) : 0xFF00;
 431                         case 0x65: return GB(ge->status, GoodsEntry::GES_ACCEPTANCE, 1) << 3;
 432                         case 0x69: {
 433                                 assert_compile((int)GoodsEntry::GES_EVER_ACCEPTED + 1 == (int)GoodsEntry::GES_LAST_MONTH);
 434                                 assert_compile((int)GoodsEntry::GES_EVER_ACCEPTED + 2 == (int)GoodsEntry::GES_CURRENT_MONTH);
 435                                 assert_compile((int)GoodsEntry::GES_EVER_ACCEPTED + 3 == (int)GoodsEntry::GES_ACCEPTED_BIGTICK);
 436                                 return GB(ge->status, GoodsEntry::GES_EVER_ACCEPTED, 4);
 437                         }
 438                 }
 439         }
 440
 441         /* Handle cargo variables (deprecated) */
 442         if (variable >= 0x8C && variable <= 0xEC) {
 443                 const GoodsEntry *g = &this->goods[GB(variable - 0x8C, 3, 4)];
 444                 switch (GB(variable - 0x8C, 0, 3)) {
 445                         case 0: return g->cargo.TotalCount();
 446                         case 1: return GB(min(g->cargo.TotalCount(), 4095), 0, 4) | (GB(g->status, GoodsEntry::GES_ACCEPTANCE, 1) << 7);
 447                         case 2: return g->time_since_pickup;
 448                         case 3: return g->rating;
 449                         case 4: return g->cargo.Source();
 450                         case 5: return g->cargo.DaysInTransit();
 451                         case 6: return g->last_speed;
 452                         case 7: return g->last_age;
 453                 }
 454         }
 455
 456         DEBUG(grf, 1, "Unhandled station variable 0x%X", variable);
 457
 458         *available = false;
 459         return UINT_MAX;
 460 }
 461
 462 uint32 Waypoint::GetNewGRFVariable(const ResolverObject &object, byte variable, byte parameter, bool *available) const
 463 {
 464         switch (variable) {
 465                 case 0x48: return 0; // Accepted cargo types
 466                 case 0x8A: return HVOT_WAYPOINT;
 467                 case 0xF1: return 0; // airport type
 468                 case 0xF2: return 0; // truck stop status
 469                 case 0xF3: return 0; // bus stop status
 470                 case 0xF6: return 0; // airport flags
 471                 case 0xF7: return 0; // airport flags cont.
 472         }
 473
 474         /* Handle cargo variables with parameter, 0x60 to 0x65 */
 475         if (variable >= 0x60 && variable <= 0x65) {
 476                 return 0;
 477         }
 478
 479         /* Handle cargo variables (deprecated) */
 480         if (variable >= 0x8C && variable <= 0xEC) {
 481                 switch (GB(variable - 0x8C, 0, 3)) {
 482                         case 3: return INITIAL_STATION_RATING;
 483                         case 4: return INVALID_STATION;
 484                         default: return 0;
 485                 }
 486         }
 487
 488         DEBUG(grf, 1, "Unhandled station variable 0x%X", variable);
 489
 490         *available = false;
 491         return UINT_MAX;
 492 }
 493
 494 /* virtual */ const SpriteGroup *StationResolverObject::ResolveReal(const RealSpriteGroup *group) const
 495 {
 496         if (this->station_scope.st == NULL || this->station_scope.statspec->cls_id == STAT_CLASS_WAYP) {
 497                 return group->loading[0];
 498         }
 499
 500         uint cargo = 0;
 501         const Station *st = Station::From(this->station_scope.st);
 502
 503         switch (this->station_scope.cargo_type) {
 504                 case CT_INVALID:
 505                 case CT_DEFAULT_NA:
 506                 case CT_PURCHASE:
 507                         cargo = 0;
 508                         break;
 509
 510                 case CT_DEFAULT:
 511                         for (CargoID cargo_type = 0; cargo_type < NUM_CARGO; cargo_type++) {
 512                                 cargo += st->goods[cargo_type].cargo.TotalCount();
 513                         }
 514                         break;
 515
 516                 default:
 517                         cargo = st->goods[this->station_scope.cargo_type].cargo.TotalCount();
 518                         break;
 519         }
 520
 521         if (HasBit(this->station_scope.statspec->flags, SSF_DIV_BY_STATION_SIZE)) cargo /= (st->train_station.w + st->train_station.h);
 522         cargo = min(0xfff, cargo);
 523
 524         if (cargo > this->station_scope.statspec->cargo_threshold) {
 525                 if (group->num_loading > 0) {
 526                         uint set = ((cargo - this->station_scope.statspec->cargo_threshold) * group->num_loading) / (4096 - this->station_scope.statspec->cargo_threshold);
 527                         return group->loading[set];
 528                 }
 529         } else {
 530                 if (group->num_loaded > 0) {
 531                         uint set = (cargo * group->num_loaded) / (this->station_scope.statspec->cargo_threshold + 1);
 532                         return group->loaded[set];
 533                 }
 534         }
 535
 536         return group->loading[0];
 537 }
 538
 539 /**
 540  * Resolver for stations.
 541  * @param statspec Station (type) specification.
 542  * @param st Instance of the station.
 543  * @param tile %Tile of the station.
 544  * @param callback Callback ID.
 545  * @param callback_param1 First parameter (var 10) of the callback.
 546  * @param callback_param2 Second parameter (var 18) of the callback.
 547  */
 548 StationResolverObject::StationResolverObject(const StationSpec *statspec, BaseStation *st, TileIndex tile,
 549                 CallbackID callback, uint32 callback_param1, uint32 callback_param2)
 550         : ResolverObject(statspec->grf_prop.grffile, callback, callback_param1, callback_param2),
 551         station_scope(*this, statspec, st, tile), town_scope(NULL)
 552 {
 553         /* Invalidate all cached vars */
 554         _svc.valid = 0;
 555
 556         CargoID ctype = CT_DEFAULT_NA;
 557
 558         if (this->station_scope.st == NULL) {
 559                 /* No station, so we are in a purchase list */
 560                 ctype = CT_PURCHASE;
 561         } else if (Station::IsExpected(this->station_scope.st)) {
 562                 const Station *st = Station::From(this->station_scope.st);
 563                 /* Pick the first cargo that we have waiting */
 564                 const CargoSpec *cs;
 565                 FOR_ALL_CARGOSPECS(cs) {
 566                         if (this->station_scope.statspec->grf_prop.spritegroup[cs->Index()] != NULL &&
 567                                         st->goods[cs->Index()].cargo.TotalCount() > 0) {
 568                                 ctype = cs->Index();
 569                                 break;
 570                         }
 571                 }
 572         }
 573
 574         if (this->station_scope.statspec->grf_prop.spritegroup[ctype] == NULL) {
 575                 ctype = CT_DEFAULT;
 576         }
 577
 578         /* Remember the cargo type we've picked */
 579         this->station_scope.cargo_type = ctype;
 580         this->root_spritegroup = this->station_scope.statspec->grf_prop.spritegroup[this->station_scope.cargo_type];
 581 }
 582
 583 StationResolverObject::~StationResolverObject()
 584 {
 585         delete this->town_scope;
 586 }
 587
 588 /**
 589  * Constructor for station scopes.
 590  * @param ro Surrounding resolver.
 591  * @param statspec Station (type) specification.
 592  * @param st Instance of the station.
 593  * @param tile %Tile of the station.
 594  */
 595 StationScopeResolver::StationScopeResolver(ResolverObject &ro, const StationSpec *statspec, BaseStation *st, TileIndex tile)
 596         : ScopeResolver(ro)
 597 {
 598         this->tile = tile;
 599         this->st = st;
 600         this->statspec = statspec;
 601         this->cargo_type = CT_INVALID;
 602         this->axis = INVALID_AXIS;
 603 }
 604
 605 /**
 606  * Resolve sprites for drawing a station tile.
 607  * @param statspec Station spec
 608  * @param st Station (NULL in GUI)
 609  * @param tile Station tile being drawn (INVALID_TILE in GUI)
 610  * @param var10 Value to put in variable 10; normally 0; 1 when resolving the groundsprite and SSF_SEPARATE_GROUND is set.
 611  * @return First sprite of the Action 1 spriteset to use, minus an offset of 0x42D to accommodate for weird NewGRF specs.
 612  */
 613 SpriteID GetCustomStationRelocation(const StationSpec *statspec, BaseStation *st, TileIndex tile, uint32 var10)
 614 {
 615         StationResolverObject object(statspec, st, tile, CBID_NO_CALLBACK, var10);
 616         const SpriteGroup *group = object.Resolve();
 617         if (group == NULL || group->type != SGT_RESULT) return 0;
 618         return group->GetResult() - 0x42D;
 619 }
 620
 621 /**
 622  * Resolve the sprites for custom station foundations.
 623  * @param statspec Station spec
 624  * @param st Station
 625  * @param tile Station tile being drawn
 626  * @param layout Spritelayout as returned by previous callback
 627  * @param edge_info Information about northern tile edges; whether they need foundations or merge into adjacent tile's foundations.
 628  * @return First sprite of a set of foundation sprites for various slopes, or 0 if default foundations shall be drawn.
 629  */
 630 SpriteID GetCustomStationFoundationRelocation(const StationSpec *statspec, BaseStation *st, TileIndex tile, uint layout, uint edge_info)
 631 {
 632         /* callback_param1 == 2 means  we are resolving the foundation sprites. */
 633         StationResolverObject object(statspec, st, tile, CBID_NO_CALLBACK, 2, layout | (edge_info << 16));
 634
 635         const SpriteGroup *group = object.Resolve();
 636         if (group == NULL || group->type != SGT_RESULT) return 0;
 637
 638         /* Note: SpriteGroup::Resolve zeroes all registers, so register 0x100 is initialised to 0. (compatibility) */
 639         return group->GetResult() + GetRegister(0x100);
 640 }
 641
 642
 643 uint16 GetStationCallback(CallbackID callback, uint32 param1, uint32 param2, const StationSpec *statspec, BaseStation *st, TileIndex tile)
 644 {
 645         StationResolverObject object(statspec, st, tile, callback, param1, param2);
 646         return object.ResolveCallback();
 647 }
 648
 649 /**
 650  * Check the slope of a tile of a new station.
 651  * @param north_tile Norther tile of the station rect.
 652  * @param cur_tile Tile to check.
 653  * @param statspec Station spec.
 654  * @param axis Axis of the new station.
 655  * @param plat_len Platform length.
 656  * @param numtracks Number of platforms.
 657  * @return Succeeded or failed command.
 658  */
 659 CommandCost PerformStationTileSlopeCheck(TileIndex north_tile, TileIndex cur_tile, const StationSpec *statspec, Axis axis, byte plat_len, byte numtracks)
 660 {
 661         TileIndexDiff diff = cur_tile - north_tile;
 662         Slope slope = GetTileSlope(cur_tile);
 663
 664         StationResolverObject object(statspec, NULL, cur_tile, CBID_STATION_LAND_SLOPE_CHECK,
 665                         (slope << 4) | (slope ^ (axis == AXIS_Y && HasBit(slope, CORNER_W) != HasBit(slope, CORNER_E) ? SLOPE_EW : 0)),
 666                         (numtracks << 24) | (plat_len << 16) | (axis == AXIS_Y ? TileX(diff) << 8 | TileY(diff) : TileY(diff) << 8 | TileX(diff)));
 667         object.station_scope.axis = axis;
 668
 669         uint16 cb_res = object.ResolveCallback();
 670
 671         /* Failed callback means success. */
 672         if (cb_res == CALLBACK_FAILED) return CommandCost();
 673
 674         /* The meaning of bit 10 is inverted for a grf version < 8. */
 675         if (statspec->grf_prop.grffile->grf_version < 8) ToggleBit(cb_res, 10);
 676         return GetErrorMessageFromLocationCallbackResult(cb_res, statspec->grf_prop.grffile, STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
 677 }
 678
 679
 680 /**
 681  * Allocate a StationSpec to a Station. This is called once per build operation.
 682  * @param statspec StationSpec to allocate.
 683  * @param st Station to allocate it to.
 684  * @param exec Whether to actually allocate the spec.
 685  * @return Index within the Station's spec list, or -1 if the allocation failed.
 686  */
 687 int AllocateSpecToStation(const StationSpec *statspec, BaseStation *st, bool exec)
 688 {
 689         uint i;
 690
 691         if (statspec == NULL || st == NULL) return 0;
 692
 693         for (i = 1; i < st->num_specs && i < NUM_STATIONSSPECS_PER_STATION; i++) {
 694                 if (st->speclist[i].spec == NULL && st->speclist[i].grfid == 0) break;
 695         }
 696
 697         if (i == NUM_STATIONSSPECS_PER_STATION) {
 698                 /* As final effort when the spec list is already full...
 699                  * try to find the same spec and return that one. This might
 700                  * result in slightly "wrong" (as per specs) looking stations,
 701                  * but it's fairly unlikely that one reaches the limit anyways.
 702                  */
 703                 for (i = 1; i < st->num_specs && i < NUM_STATIONSSPECS_PER_STATION; i++) {
 704                         if (st->speclist[i].spec == statspec) return i;
 705                 }
 706
 707                 return -1;
 708         }
 709
 710         if (exec) {
 711                 if (i >= st->num_specs) {
 712                         st->num_specs = i + 1;
 713                         st->speclist = ReallocT(st->speclist, st->num_specs);
 714
 715                         if (st->num_specs == 2) {
 716                                 /* Initial allocation */
 717                                 st->speclist[0].spec     = NULL;
 718                                 st->speclist[0].grfid    = 0;
 719                                 st->speclist[0].localidx = 0;
 720                         }
 721                 }
 722
 723                 st->speclist[i].spec     = statspec;
 724                 st->speclist[i].grfid    = statspec->grf_prop.grffile->grfid;
 725                 st->speclist[i].localidx = statspec->grf_prop.local_id;
 726
 727                 StationUpdateCachedTriggers(st);
 728         }
 729
 730         return i;
 731 }
 732
 733
 734 /**
 735  * Deallocate a StationSpec from a Station. Called when removing a single station tile.
 736  * @param st Station to work with.
 737  * @param specindex Index of the custom station within the Station's spec list.
 738  * @return Indicates whether the StationSpec was deallocated.
 739  */
 740 void DeallocateSpecFromStation(BaseStation *st, byte specindex)
 741 {
 742         /* specindex of 0 (default) is never freeable */
 743         if (specindex == 0) return;
 744
 745         ETileArea area = ETileArea(st, INVALID_TILE, TA_WHOLE);
 746         /* Check all tiles over the station to check if the specindex is still in use */
 747         TILE_AREA_LOOP(tile, area) {
 748                 if (st->TileBelongsToRailStation(tile) && GetCustomStationSpecIndex(tile) == specindex) {
 749                         return;
 750                 }
 751         }
 752
 753         /* This specindex is no longer in use, so deallocate it */
 754         st->speclist[specindex].spec     = NULL;
 755         st->speclist[specindex].grfid    = 0;
 756         st->speclist[specindex].localidx = 0;
 757
 758         /* If this was the highest spec index, reallocate */
 759         if (specindex == st->num_specs - 1) {
 760                 for (; st->speclist[st->num_specs - 1].grfid == 0 && st->num_specs > 1; st->num_specs--) {}
 761
 762                 if (st->num_specs > 1) {
 763                         st->speclist = ReallocT(st->speclist, st->num_specs);
 764                 } else {
 765                         free(st->speclist);
 766                         st->num_specs = 0;
 767                         st->speclist  = NULL;
 768                         st->cached_anim_triggers = 0;
 769                         st->cached_cargo_triggers = 0;
 770                         return;
 771                 }
 772         }
 773
 774         StationUpdateCachedTriggers(st);
 775 }
 776
 777 /**
 778  * Draw representation of a station tile for GUI purposes.
 779  * @param x Position x of image.
 780  * @param y Position y of image.
 781  * @param axis Axis.
 782  * @param railtype Rail type.
 783  * @param sclass, station Type of station.
 784  * @param station station ID
 785  * @return True if the tile was drawn (allows for fallback to default graphic)
 786  */
 787 bool DrawStationTile(int x, int y, RailType railtype, Axis axis, StationClassID sclass, uint station)
 788 {
 789         const DrawTileSprites *sprites = NULL;
 790         const RailtypeInfo *rti = GetRailTypeInfo(railtype);
 791         PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
 792         uint tile = 2;
 793
 794         const StationSpec *statspec = StationClass::Get(sclass)->GetSpec(station);
 795         if (statspec == NULL) return false;
 796
 797         if (HasBit(statspec->callback_mask, CBM_STATION_SPRITE_LAYOUT)) {
 798                 uint16 callback = GetStationCallback(CBID_STATION_SPRITE_LAYOUT, 0x2110000, 0, statspec, NULL, INVALID_TILE);
 799                 if (callback != CALLBACK_FAILED) tile = callback;
 800         }
 801
 802         uint32 total_offset = rti->GetRailtypeSpriteOffset();
 803         uint32 relocation = 0;
 804         uint32 ground_relocation = 0;
 805         const NewGRFSpriteLayout *layout = NULL;
 806         DrawTileSprites tmp_rail_layout;
 807
 808         if (statspec->renderdata == NULL) {
 809                 sprites = GetStationTileLayout(STATION_RAIL, tile + axis);
 810         } else {
 811                 layout = &statspec->renderdata[(tile < statspec->tiles) ? tile + axis : (uint)axis];
 812                 if (!layout->NeedsPreprocessing()) {
 813                         sprites = layout;
 814                         layout = NULL;
 815                 }
 816         }
 817
 818         if (layout != NULL) {
 819                 /* Sprite layout which needs preprocessing */
 820                 bool separate_ground = HasBit(statspec->flags, SSF_SEPARATE_GROUND);
 821                 uint32 var10_values = layout->PrepareLayout(total_offset, rti->fallback_railtype, 0, 0, separate_ground);
 822                 uint8 var10;
 823                 FOR_EACH_SET_BIT(var10, var10_values) {
 824                         uint32 var10_relocation = GetCustomStationRelocation(statspec, NULL, INVALID_TILE, var10);
 825                         layout->ProcessRegisters(var10, var10_relocation, separate_ground);
 826                 }
 827
 828                 tmp_rail_layout.seq = layout->GetLayout(&tmp_rail_layout.ground);
 829                 sprites = &tmp_rail_layout;
 830                 total_offset = 0;
 831         } else {
 832                 /* Simple sprite layout */
 833                 ground_relocation = relocation = GetCustomStationRelocation(statspec, NULL, INVALID_TILE, 0);
 834                 if (HasBit(sprites->ground.sprite, SPRITE_MODIFIER_CUSTOM_SPRITE)) {
 835                         ground_relocation = GetCustomStationRelocation(statspec, NULL, INVALID_TILE, 1);
 836                 }
 837                 ground_relocation += rti->fallback_railtype;
 838         }
 839
 840         SpriteID image = sprites->ground.sprite;
 841         PaletteID pal = sprites->ground.pal;
 842         RailTrackOffset overlay_offset;
 843         if (rti->UsesOverlay() && SplitGroundSpriteForOverlay(NULL, &image, &overlay_offset)) {
 844                 SpriteID ground = GetCustomRailSprite(rti, INVALID_TILE, RTSG_GROUND);
 845                 DrawSprite(image, PAL_NONE, x, y);
 846                 DrawSprite(ground + overlay_offset, PAL_NONE, x, y);
 847         } else {
 848                 image += HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE) ? ground_relocation : total_offset;
 849                 if (HasBit(pal, SPRITE_MODIFIER_CUSTOM_SPRITE)) pal += ground_relocation;
 850                 DrawSprite(image, GroundSpritePaletteTransform(image, pal, palette), x, y);
 851         }
 852
 853         DrawRailTileSeqInGUI(x, y, sprites, total_offset, relocation, palette);
 854
 855         return true;
 856 }
 857
 858
 859 const StationSpec *GetStationSpec(TileIndex t)
 860 {
 861         if (!IsCustomStationSpecIndex(t)) return NULL;
 862
 863         const BaseStation *st = BaseStation::GetByTile(t);
 864         uint specindex = GetCustomStationSpecIndex(t);
 865         return specindex < st->num_specs ? st->speclist[specindex].spec : NULL;
 866 }
 867
 868
 869 /**
 870  * Check whether a rail station tile is NOT traversable.
 871  * @param tile %Tile to test.
 872  * @return Station tile is blocked.
 873  * @note This could be cached (during build) in the map array to save on all the dereferencing.
 874  */
 875 bool IsStationTileBlocked(TileIndex tile)
 876 {
 877         const StationSpec *statspec = GetStationSpec(tile);
 878
 879         return statspec != NULL && HasBit(statspec->blocked, GetStationGfx(tile));
 880 }
 881
 882 /**
 883  * Check if a rail station tile shall have pylons when electrified.
 884  * @param tile %Tile to test.
 885  * @return Tile shall have pylons.
 886  * @note This could be cached (during build) in the map array to save on all the dereferencing.
 887  */
 888 bool CanStationTileHavePylons(TileIndex tile)
 889 {
 890         const StationSpec *statspec = GetStationSpec(tile);
 891         uint gfx = GetStationGfx(tile);
 892         /* Default stations do not draw pylons under roofs (gfx >= 4) */
 893         return statspec != NULL ? HasBit(statspec->pylons, gfx) : gfx < 4;
 894 }
 895
 896 /**
 897  * Check if a rail station tile shall have wires when electrified.
 898  * @param tile %Tile to test.
 899  * @return Tile shall have wires.
 900  * @note This could be cached (during build) in the map array to save on all the dereferencing.
 901  */
 902 bool CanStationTileHaveWires(TileIndex tile)
 903 {
 904         const StationSpec *statspec = GetStationSpec(tile);
 905         return statspec == NULL || !HasBit(statspec->wires, GetStationGfx(tile));
 906 }
 907
 908 /** Wrapper for animation control, see #GetStationCallback. */
 909 uint16 GetAnimStationCallback(CallbackID callback, uint32 param1, uint32 param2, const StationSpec *statspec, BaseStation *st, TileIndex tile, int extra_data)
 910 {
 911         return GetStationCallback(callback, param1, param2, statspec, st, tile);
 912 }
 913
 914 /** Helper class for animation control. */
 915 struct StationAnimationBase : public AnimationBase<StationAnimationBase, StationSpec, BaseStation, int, GetAnimStationCallback> {
 916         static const CallbackID cb_animation_speed      = CBID_STATION_ANIMATION_SPEED;
 917         static const CallbackID cb_animation_next_frame = CBID_STATION_ANIM_NEXT_FRAME;
 918
 919         static const StationCallbackMask cbm_animation_speed      = CBM_STATION_ANIMATION_SPEED;
 920         static const StationCallbackMask cbm_animation_next_frame = CBM_STATION_ANIMATION_NEXT_FRAME;
 921 };
 922
 923 void AnimateStationTile(TileIndex tile)
 924 {
 925         const StationSpec *ss = GetStationSpec(tile);
 926         if (ss == NULL) return;
 927
 928         StationAnimationBase::AnimateTile(ss, BaseStation::GetByTile(tile), tile, HasBit(ss->flags, SSF_CB141_RANDOM_BITS));
 929 }
 930
 931 void TriggerStationAnimation(BaseStation *st, TileIndex tile, StationAnimationTrigger trigger, CargoID cargo_type)
 932 {
 933         /* List of coverage areas for each animation trigger */
 934         static const TriggerArea tas[] = {
 935                 TA_TILE, TA_WHOLE, TA_WHOLE, TA_PLATFORM, TA_PLATFORM, TA_PLATFORM, TA_WHOLE
 936         };
 937
 938         /* Get Station if it wasn't supplied */
 939         if (st == NULL) st = BaseStation::GetByTile(tile);
 940
 941         /* Check the cached animation trigger bitmask to see if we need
 942          * to bother with any further processing. */
 943         if (!HasBit(st->cached_anim_triggers, trigger)) return;
 944
 945         uint16 random_bits = Random();
 946         ETileArea area = ETileArea(st, tile, tas[trigger]);
 947
 948         /* Check all tiles over the station to check if the specindex is still in use */
 949         TILE_AREA_LOOP(tile, area) {
 950                 if (st->TileBelongsToRailStation(tile)) {
 951                         const StationSpec *ss = GetStationSpec(tile);
 952                         if (ss != NULL && HasBit(ss->animation.triggers, trigger)) {
 953                                 CargoID cargo;
 954                                 if (cargo_type == CT_INVALID) {
 955                                         cargo = CT_INVALID;
 956                                 } else {
 957                                         cargo = ss->grf_prop.grffile->cargo_map[cargo_type];
 958                                 }
 959                                 StationAnimationBase::ChangeAnimationFrame(CBID_STATION_ANIM_START_STOP, ss, st, tile, (random_bits << 16) | Random(), (uint8)trigger | (cargo << 8));
 960                         }
 961                 }
 962         }
 963 }
 964
 965 /**
 966  * Trigger station randomisation
 967  * @param st station being triggered
 968  * @param tile specific tile of platform to trigger
 969  * @param trigger trigger type
 970  * @param cargo_type cargo type causing trigger
 971  */
 972 void TriggerStationRandomisation(Station *st, TileIndex tile, StationRandomTrigger trigger, CargoID cargo_type)
 973 {
 974         /* List of coverage areas for each animation trigger */
 975         static const TriggerArea tas[] = {
 976                 TA_WHOLE, TA_WHOLE, TA_PLATFORM, TA_PLATFORM, TA_PLATFORM, TA_PLATFORM
 977         };
 978
 979         /* Get Station if it wasn't supplied */
 980         if (st == NULL) st = Station::GetByTile(tile);
 981
 982         /* Check the cached cargo trigger bitmask to see if we need
 983          * to bother with any further processing. */
 984         if (st->cached_cargo_triggers == 0) return;
 985         if (cargo_type != CT_INVALID && !HasBit(st->cached_cargo_triggers, cargo_type)) return;
 986
 987         uint32 whole_reseed = 0;
 988         ETileArea area = ETileArea(st, tile, tas[trigger]);
 989
 990         uint32 empty_mask = 0;
 991         if (trigger == SRT_CARGO_TAKEN) {
 992                 /* Create a bitmask of completely empty cargo types to be matched */
 993                 for (CargoID i = 0; i < NUM_CARGO; i++) {
 994                         if (st->goods[i].cargo.TotalCount() == 0) {
 995                                 SetBit(empty_mask, i);
 996                         }
 997                 }
 998         }
 999
1000         /* Convert trigger to bit */
1001         uint8 trigger_bit = 1 << trigger;
1002
1003         /* Check all tiles over the station to check if the specindex is still in use */
1004         TILE_AREA_LOOP(tile, area) {
1005                 if (st->TileBelongsToRailStation(tile)) {
1006                         const StationSpec *ss = GetStationSpec(tile);
1007                         if (ss == NULL) continue;
1008
1009                         /* Cargo taken "will only be triggered if all of those
1010                          * cargo types have no more cargo waiting." */
1011                         if (trigger == SRT_CARGO_TAKEN) {
1012                                 if ((ss->cargo_triggers & ~empty_mask) != 0) continue;
1013                         }
1014
1015                         if (cargo_type == CT_INVALID || HasBit(ss->cargo_triggers, cargo_type)) {
1016                                 StationResolverObject object(ss, st, tile, CBID_RANDOM_TRIGGER, 0);
1017                                 object.trigger = trigger_bit;
1018
1019                                 const SpriteGroup *group = object.Resolve();
1020                                 if (group == NULL) continue;
1021
1022                                 uint32 reseed = object.GetReseedSum();
1023                                 if (reseed != 0) {
1024                                         whole_reseed |= reseed;
1025                                         reseed >>= 16;
1026
1027                                         /* Set individual tile random bits */
1028                                         uint8 random_bits = GetStationTileRandomBits(tile);
1029                                         random_bits &= ~reseed;
1030                                         random_bits |= Random() & reseed;
1031                                         SetStationTileRandomBits(tile, random_bits);
1032
1033                                         MarkTileDirtyByTile(tile);
1034                                 }
1035                         }
1036                 }
1037         }
1038
1039         /* Update whole station random bits */
1040         if ((whole_reseed & 0xFFFF) != 0) {
1041                 st->random_bits &= ~whole_reseed;
1042                 st->random_bits |= Random() & whole_reseed;
1043         }
1044 }
1045
1046 /**
1047  * Update the cached animation trigger bitmask for a station.
1048  * @param st Station to update.
1049  */
1050 void StationUpdateCachedTriggers(BaseStation *st)
1051 {
1052         st->cached_anim_triggers = 0;
1053         st->cached_cargo_triggers = 0;
1054
1055         /* Combine animation trigger bitmask for all station specs
1056          * of this station. */
1057         for (uint i = 0; i < st->num_specs; i++) {
1058                 const StationSpec *ss = st->speclist[i].spec;
1059                 if (ss != NULL) {
1060                         st->cached_anim_triggers |= ss->animation.triggers;
1061                         st->cached_cargo_triggers |= ss->cargo_triggers;
1062                 }
1063         }
1064 }
1065