src/newgrf_industries.cpp

   1 /* $Id: newgrf_industries.cpp 26388 2014-03-03 20:02:31Z frosch $ */
   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_industries.cpp Handling of NewGRF industries. */
  11
  12 #include "stdafx.h"
  13 #include "debug.h"
  14 #include "industry.h"
  15 #include "newgrf_industries.h"
  16 #include "newgrf_town.h"
  17 #include "newgrf_cargo.h"
  18 #include "window_func.h"
  19 #include "town.h"
  20 #include "company_base.h"
  21 #include "error.h"
  22 #include "strings_func.h"
  23 #include "core/random_func.hpp"
  24
  25 #include "table/strings.h"
  26
  27 #include "safeguards.h"
  28
  29 /* Since the industry IDs defined by the GRF file don't necessarily correlate
  30  * to those used by the game, the IDs used for overriding old industries must be
  31  * translated when the idustry spec is set. */
  32 IndustryOverrideManager _industry_mngr(NEW_INDUSTRYOFFSET, NUM_INDUSTRYTYPES, INVALID_INDUSTRYTYPE);
  33 IndustryTileOverrideManager _industile_mngr(NEW_INDUSTRYTILEOFFSET, NUM_INDUSTRYTILES, INVALID_INDUSTRYTILE);
  34
  35 /**
  36  * Map the GRF local type to an industry type.
  37  * @param grf_type The GRF local type.
  38  * @param grf_id The GRF of the local type.
  39  * @return The industry type in the global scope.
  40  */
  41 IndustryType MapNewGRFIndustryType(IndustryType grf_type, uint32 grf_id)
  42 {
  43         if (grf_type == IT_INVALID) return IT_INVALID;
  44         if (!HasBit(grf_type, 7)) return GB(grf_type, 0, 7);
  45
  46         return _industry_mngr.GetID(GB(grf_type, 0, 7), grf_id);
  47 }
  48
  49 /**
  50  * Make an analysis of a tile and check for its belonging to the same
  51  * industry, and/or the same grf file
  52  * @param tile TileIndex of the tile to query
  53  * @param i Industry to which to compare the tile to
  54  * @param cur_grfid GRFID of the current callback chain
  55  * @return value encoded as per NFO specs
  56  */
  57 uint32 GetIndustryIDAtOffset(TileIndex tile, const Industry *i, uint32 cur_grfid)
  58 {
  59         if (!i->TileBelongsToIndustry(tile)) {
  60                 /* No industry and/or the tile does not have the same industry as the one we match it with */
  61                 return 0xFFFF;
  62         }
  63
  64         IndustryGfx gfx = GetCleanIndustryGfx(tile);
  65         const IndustryTileSpec *indtsp = GetIndustryTileSpec(gfx);
  66
  67         if (gfx < NEW_INDUSTRYTILEOFFSET) { // Does it belongs to an old type?
  68                 /* It is an old tile.  We have to see if it's been overridden */
  69                 if (indtsp->grf_prop.override == INVALID_INDUSTRYTILE) { // has it been overridden?
  70                         return 0xFF << 8 | gfx; // no. Tag FF + the gfx id of that tile
  71                 }
  72                 /* Overridden */
  73                 const IndustryTileSpec *tile_ovr = GetIndustryTileSpec(indtsp->grf_prop.override);
  74
  75                 if (tile_ovr->grf_prop.grffile->grfid == cur_grfid) {
  76                         return tile_ovr->grf_prop.local_id; // same grf file
  77                 } else {
  78                         return 0xFFFE; // not the same grf file
  79                 }
  80         }
  81         /* Not an 'old type' tile */
  82         if (indtsp->grf_prop.spritegroup[0] != nullptr) { // tile has a spritegroup ?
  83                 if (indtsp->grf_prop.grffile->grfid == cur_grfid) { // same industry, same grf ?
  84                         return indtsp->grf_prop.local_id;
  85                 } else {
  86                         return 0xFFFE; // Defined in another grf file
  87                 }
  88         }
  89         /* The tile has no spritegroup */
  90         return 0xFF << 8 | indtsp->grf_prop.subst_id; // so just give him the substitute
  91 }
  92
  93 static uint32 GetClosestIndustry(TileIndex tile, IndustryType type, const Industry *current)
  94 {
  95         uint32 best_dist = UINT32_MAX;
  96         const Industry *i;
  97         FOR_ALL_INDUSTRIES(i) {
  98                 if (i->type != type || i == current) continue;
  99
 100                 best_dist = min(best_dist, DistanceManhattan(tile, i->location.tile));
 101         }
 102
 103         return best_dist;
 104 }
 105
 106 /**
 107  * Implementation of both var 67 and 68
 108  * since the mechanism is almost the same, it is easier to regroup them on the same
 109  * function.
 110  * @param param_setID parameter given to the callback, which is the set id, or the local id, in our terminology
 111  * @param layout_filter on what layout do we filter?
 112  * @param town_filter Do we filter on the same town as the current industry?
 113  * @param current Industry for which the inquiry is made
 114  * @return the formatted answer to the callback : rr(reserved) cc(count) dddd(manhattan distance of closest sister)
 115  */
 116 static uint32 GetCountAndDistanceOfClosestInstance(byte param_setID, byte layout_filter, bool town_filter, const Industry *current)
 117 {
 118         uint32 GrfID = GetRegister(0x100);  ///< Get the GRFID of the definition to look for in register 100h
 119         IndustryType ind_index;
 120         uint32 closest_dist = UINT32_MAX;
 121         byte count = 0;
 122
 123         /* Determine what will be the industry type to look for */
 124         switch (GrfID) {
 125                 case 0:  // this is a default industry type
 126                         ind_index = param_setID;
 127                         break;
 128
 129                 case 0xFFFFFFFF: // current grf
 130                         GrfID = GetIndustrySpec(current->type)->grf_prop.grffile->grfid;
 131                         FALLTHROUGH;
 132
 133                 default: // use the grfid specified in register 100h
 134                         SetBit(param_setID, 7); // bit 7 means it is not an old type
 135                         ind_index = MapNewGRFIndustryType(param_setID, GrfID);
 136                         break;
 137         }
 138
 139         /* If the industry type is invalid, there is none and the closest is far away. */
 140         if (ind_index >= NUM_INDUSTRYTYPES) return 0 | 0xFFFF;
 141
 142         if (layout_filter == 0 && !town_filter) {
 143                 /* If the filter is 0, it could be because none was specified as well as being really a 0.
 144                  * In either case, just do the regular var67 */
 145                 closest_dist = GetClosestIndustry(current->location.tile, ind_index, current);
 146                 count = min(Industry::GetIndustryTypeCount(ind_index), UINT8_MAX); // clamp to 8 bit
 147         } else {
 148                 /* Count only those who match the same industry type and layout filter
 149                  * Unfortunately, we have to do it manually */
 150                 const Industry *i;
 151                 FOR_ALL_INDUSTRIES(i) {
 152                         if (i->type == ind_index && i != current && (i->selected_layout == layout_filter || layout_filter == 0) && (!town_filter || i->town == current->town)) {
 153                                 closest_dist = min(closest_dist, DistanceManhattan(current->location.tile, i->location.tile));
 154                                 count++;
 155                         }
 156                 }
 157         }
 158
 159         return count << 16 | GB(closest_dist, 0, 16);
 160 }
 161
 162 /* virtual */ uint32 IndustriesScopeResolver::GetVariable(byte variable, uint32 parameter, bool *available) const
 163 {
 164         if (this->ro.callback == CBID_INDUSTRY_LOCATION) {
 165                 /* Variables available during construction check. */
 166
 167                 switch (variable) {
 168                         case 0x80: return this->tile;
 169                         case 0x81: return GB(this->tile, 8, 8);
 170
 171                         /* Pointer to the town the industry is associated with */
 172                         case 0x82: return this->industry->town->index;
 173                         case 0x83:
 174                         case 0x84:
 175                         case 0x85: DEBUG(grf, 0, "NewGRFs shouldn't be doing pointer magic"); break; // not supported
 176
 177                         /* Number of the layout */
 178                         case 0x86: return this->industry->selected_layout;
 179
 180                         /* Ground type */
 181                         case 0x87: return GetTerrainType(this->tile);
 182
 183                         /* Town zone */
 184                         case 0x88: return GetTownRadiusGroup(this->industry->town, this->tile);
 185
 186                         /* Manhattan distance of the closest town */
 187                         case 0x89: return min(DistanceManhattan(this->industry->town->xy, this->tile), 255);
 188
 189                         /* Lowest height of the tile */
 190                         case 0x8A: return Clamp(GetTileZ(this->tile) * (this->ro.grffile->grf_version >= 8 ? 1 : TILE_HEIGHT), 0, 0xFF);
 191
 192                         /* Distance to the nearest water/land tile */
 193                         case 0x8B: return GetClosestWaterDistance(this->tile, (GetIndustrySpec(this->industry->type)->behaviour & INDUSTRYBEH_BUILT_ONWATER) == 0);
 194
 195                         /* Square of Euclidian distance from town */
 196                         case 0x8D: return min(DistanceSquare(this->industry->town->xy, this->tile), 65535);
 197
 198                         /* 32 random bits */
 199                         case 0x8F: return this->random_bits;
 200                 }
 201         }
 202
 203         const IndustrySpec *indspec = GetIndustrySpec(this->type);
 204
 205         if (this->industry == nullptr) {
 206                 DEBUG(grf, 1, "Unhandled variable 0x%X (no available industry) in callback 0x%x", variable, this->ro.callback);
 207
 208                 *available = false;
 209                 return UINT_MAX;
 210         }
 211
 212         switch (variable) {
 213                 case 0x40:
 214                 case 0x41:
 215                 case 0x42: { // waiting cargo, but only if those two callback flags are set
 216                         uint16 callback = indspec->callback_mask;
 217                         if (HasBit(callback, CBM_IND_PRODUCTION_CARGO_ARRIVAL) || HasBit(callback, CBM_IND_PRODUCTION_256_TICKS)) {
 218                                 if ((indspec->behaviour & INDUSTRYBEH_PROD_MULTI_HNDLING) != 0) {
 219                                         if (this->industry->prod_level == 0) return 0;
 220                                         return min(this->industry->incoming_cargo_waiting[variable - 0x40] / this->industry->prod_level, (uint16)0xFFFF);
 221                                 } else {
 222                                         return min(this->industry->incoming_cargo_waiting[variable - 0x40], (uint16)0xFFFF);
 223                                 }
 224                         } else {
 225                                 return 0;
 226                         }
 227                 }
 228
 229                 /* Manhattan distance of closes dry/water tile */
 230                 case 0x43:
 231                         if (this->tile == INVALID_TILE) break;
 232                         return GetClosestWaterDistance(this->tile, (indspec->behaviour & INDUSTRYBEH_BUILT_ONWATER) == 0);
 233
 234                 /* Layout number */
 235                 case 0x44: return this->industry->selected_layout;
 236
 237                 /* Company info */
 238                 case 0x45: {
 239                         byte colours = 0;
 240                         bool is_ai = false;
 241
 242                         const Company *c = Company::GetIfValid(this->industry->founder);
 243                         if (c != nullptr) {
 244                                 const Livery *l = &c->livery[LS_DEFAULT];
 245
 246                                 is_ai = c->is_ai;
 247                                 colours = l->colour1 + l->colour2 * 16;
 248                         }
 249
 250                         return this->industry->founder | (is_ai ? 0x10000 : 0) | (colours << 24);
 251                 }
 252
 253                 case 0x46: return this->industry->construction_date; // Date when built - long format - (in days)
 254
 255                 /* Get industry ID at offset param */
 256                 case 0x60: return GetIndustryIDAtOffset(GetNearbyTile(parameter, this->industry->location.tile, false), this->industry, this->ro.grffile->grfid);
 257
 258                 /* Get random tile bits at offset param */
 259                 case 0x61: {
 260                         if (this->tile == INVALID_TILE) break;
 261                         TileIndex tile = GetNearbyTile(parameter, this->tile, false);
 262                         return this->industry->TileBelongsToIndustry(tile) ? GetIndustryRandomBits(tile) : 0;
 263                 }
 264
 265                 /* Land info of nearby tiles */
 266                 case 0x62:
 267                         if (this->tile == INVALID_TILE) break;
 268                         return GetNearbyIndustryTileInformation(parameter, this->tile, INVALID_INDUSTRY, false, this->ro.grffile->grf_version >= 8);
 269
 270                 /* Animation stage of nearby tiles */
 271                 case 0x63: {
 272                         if (this->tile == INVALID_TILE) break;
 273                         TileIndex tile = GetNearbyTile(parameter, this->tile, false);
 274                         if (this->industry->TileBelongsToIndustry(tile)) {
 275                                 return GetAnimationFrame(tile);
 276                         }
 277                         return 0xFFFFFFFF;
 278                 }
 279
 280                 /* Distance of nearest industry of given type */
 281                 case 0x64:
 282                         if (this->tile == INVALID_TILE) break;
 283                         return GetClosestIndustry(this->tile, MapNewGRFIndustryType(parameter, indspec->grf_prop.grffile->grfid), this->industry);
 284                 /* Get town zone and Manhattan distance of closest town */
 285                 case 0x65:
 286                         if (this->tile == INVALID_TILE) break;
 287                         return GetTownRadiusGroup(this->industry->town, this->tile) << 16 | min(DistanceManhattan(this->tile, this->industry->town->xy), 0xFFFF);
 288                 /* Get square of Euclidian distance of closes town */
 289                 case 0x66:
 290                         if (this->tile == INVALID_TILE) break;
 291                         return GetTownRadiusGroup(this->industry->town, this->tile) << 16 | min(DistanceSquare(this->tile, this->industry->town->xy), 0xFFFF);
 292
 293                 /* Count of industry, distance of closest instance
 294                  * 68 is the same as 67, but with a filtering on selected layout */
 295                 case 0x67:
 296                 case 0x68: {
 297                         byte layout_filter = 0;
 298                         bool town_filter = false;
 299                         if (variable == 0x68) {
 300                                 uint32 reg = GetRegister(0x101);
 301                                 layout_filter = GB(reg, 0, 8);
 302                                 town_filter = HasBit(reg, 8);
 303                         }
 304                         return GetCountAndDistanceOfClosestInstance(parameter, layout_filter, town_filter, this->industry);
 305                 }
 306
 307                 /* Get a variable from the persistent storage */
 308                 case 0x7C: return (this->industry->psa != nullptr) ? this->industry->psa->GetValue(parameter) : 0;
 309
 310                 /* Industry structure access*/
 311                 case 0x80: return this->industry->location.tile;
 312                 case 0x81: return GB(this->industry->location.tile, 8, 8);
 313                 /* Pointer to the town the industry is associated with */
 314                 case 0x82: return this->industry->town->index;
 315                 case 0x83:
 316                 case 0x84:
 317                 case 0x85: DEBUG(grf, 0, "NewGRFs shouldn't be doing pointer magic"); break; // not supported
 318                 case 0x86: return this->industry->location.w;
 319                 case 0x87: return this->industry->location.h;// xy dimensions
 320
 321                 case 0x88:
 322                 case 0x89: return this->industry->produced_cargo[variable - 0x88];
 323                 case 0x8A: return this->industry->produced_cargo_waiting[0];
 324                 case 0x8B: return GB(this->industry->produced_cargo_waiting[0], 8, 8);
 325                 case 0x8C: return this->industry->produced_cargo_waiting[1];
 326                 case 0x8D: return GB(this->industry->produced_cargo_waiting[1], 8, 8);
 327                 case 0x8E:
 328                 case 0x8F: return this->industry->production_rate[variable - 0x8E];
 329                 case 0x90:
 330                 case 0x91:
 331                 case 0x92: return this->industry->accepts_cargo[variable - 0x90];
 332                 case 0x93: return this->industry->prod_level;
 333                 /* amount of cargo produced so far THIS month. */
 334                 case 0x94: return this->industry->this_month_production[0];
 335                 case 0x95: return GB(this->industry->this_month_production[0], 8, 8);
 336                 case 0x96: return this->industry->this_month_production[1];
 337                 case 0x97: return GB(this->industry->this_month_production[1], 8, 8);
 338                 /* amount of cargo transported so far THIS month. */
 339                 case 0x98: return this->industry->this_month_transported[0];
 340                 case 0x99: return GB(this->industry->this_month_transported[0], 8, 8);
 341                 case 0x9A: return this->industry->this_month_transported[1];
 342                 case 0x9B: return GB(this->industry->this_month_transported[1], 8, 8);
 343                 /* fraction of cargo transported LAST month. */
 344                 case 0x9C:
 345                 case 0x9D: return this->industry->last_month_pct_transported[variable - 0x9C];
 346                 /* amount of cargo produced LAST month. */
 347                 case 0x9E: return this->industry->last_month_production[0];
 348                 case 0x9F: return GB(this->industry->last_month_production[0], 8, 8);
 349                 case 0xA0: return this->industry->last_month_production[1];
 350                 case 0xA1: return GB(this->industry->last_month_production[1], 8, 8);
 351                 /* amount of cargo transported last month. */
 352                 case 0xA2: return this->industry->last_month_transported[0];
 353                 case 0xA3: return GB(this->industry->last_month_transported[0], 8, 8);
 354                 case 0xA4: return this->industry->last_month_transported[1];
 355                 case 0xA5: return GB(this->industry->last_month_transported[1], 8, 8);
 356
 357                 case 0xA6: return indspec->grf_prop.local_id;
 358                 case 0xA7: return this->industry->founder;
 359                 case 0xA8: return this->industry->random_colour;
 360                 case 0xA9: return Clamp(this->industry->last_prod_year - ORIGINAL_BASE_YEAR, 0, 255);
 361                 case 0xAA: return this->industry->counter;
 362                 case 0xAB: return GB(this->industry->counter, 8, 8);
 363                 case 0xAC: return this->industry->was_cargo_delivered;
 364
 365                 case 0xB0: return Clamp(this->industry->construction_date - DAYS_TILL_ORIGINAL_BASE_YEAR, 0, 65535); // Date when built since 1920 (in days)
 366                 case 0xB3: return this->industry->construction_type; // Construction type
 367                 case 0xB4: return Clamp(this->industry->last_cargo_accepted_at - DAYS_TILL_ORIGINAL_BASE_YEAR, 0, 65535); // Date last cargo accepted since 1920 (in days)
 368         }
 369
 370         DEBUG(grf, 1, "Unhandled industry variable 0x%X", variable);
 371
 372         *available = false;
 373         return UINT_MAX;
 374 }
 375
 376 /* virtual */ uint32 IndustriesScopeResolver::GetRandomBits() const
 377 {
 378         return this->industry != nullptr ? this->industry->random : 0;
 379 }
 380
 381 /* virtual */ uint32 IndustriesScopeResolver::GetTriggers() const
 382 {
 383         return 0;
 384 }
 385
 386 /* virtual */ void IndustriesScopeResolver::StorePSA(uint pos, int32 value)
 387 {
 388         if (this->industry->index == INVALID_INDUSTRY) return;
 389
 390         if (this->industry->psa == nullptr) {
 391                 /* There is no need to create a storage if the value is zero. */
 392                 if (value == 0) return;
 393
 394                 /* Create storage on first modification. */
 395                 const IndustrySpec *indsp = GetIndustrySpec(this->industry->type);
 396                 uint32 grfid = (indsp->grf_prop.grffile != nullptr) ? indsp->grf_prop.grffile->grfid : 0;
 397                 assert(PersistentStorage::CanAllocateItem());
 398                 this->industry->psa = new PersistentStorage(grfid, GSF_INDUSTRIES, this->industry->location.tile);
 399         }
 400
 401         this->industry->psa->StoreValue(pos, value);
 402 }
 403
 404 /**
 405  * Get the grf file associated with the given industry type.
 406  * @param type Industry type to query.
 407  * @return The associated GRF file, if any.
 408  */
 409 static const GRFFile *GetGrffile(IndustryType type)
 410 {
 411         const IndustrySpec *indspec = GetIndustrySpec(type);
 412         return (indspec != nullptr) ? indspec->grf_prop.grffile : nullptr;
 413 }
 414
 415 /**
 416  * Constructor of the industries resolver.
 417  * @param tile %Tile owned by the industry.
 418  * @param industry %Industry being resolved.
 419  * @param type Type of the industry.
 420  * @param random_bits Random bits of the new industry.
 421  * @param callback Callback ID.
 422  * @param callback_param1 First parameter (var 10) of the callback.
 423  * @param callback_param2 Second parameter (var 18) of the callback.
 424  */
 425 IndustriesResolverObject::IndustriesResolverObject(TileIndex tile, Industry *indus, IndustryType type, uint32 random_bits,
 426                 CallbackID callback, uint32 callback_param1, uint32 callback_param2)
 427         : ResolverObject(GetGrffile(type), callback, callback_param1, callback_param2),
 428         industries_scope(*this, tile, indus, type, random_bits),
 429         town_scope(nullptr)
 430 {
 431         this->root_spritegroup = GetIndustrySpec(type)->grf_prop.spritegroup[0];
 432 }
 433
 434 IndustriesResolverObject::~IndustriesResolverObject()
 435 {
 436         delete this->town_scope;
 437 }
 438
 439 /**
 440  * Get or create the town scope object associated with the industry.
 441  * @return The associated town scope, if it exists.
 442  */
 443 TownScopeResolver *IndustriesResolverObject::GetTown()
 444 {
 445         if (this->town_scope == nullptr) {
 446                 Town *t = nullptr;
 447                 bool readonly = true;
 448                 if (this->industries_scope.industry != nullptr) {
 449                         t = this->industries_scope.industry->town;
 450                         readonly = this->industries_scope.industry->index == INVALID_INDUSTRY;
 451                 } else if (this->industries_scope.tile != INVALID_TILE) {
 452                         t = ClosestTownFromTile(this->industries_scope.tile, UINT_MAX);
 453                 }
 454                 if (t == nullptr) return nullptr;
 455                 this->town_scope = new TownScopeResolver(*this, t, readonly);
 456         }
 457         return this->town_scope;
 458 }
 459
 460 /**
 461  * Perform an industry callback.
 462  * @param callback The callback to perform.
 463  * @param param1 The first parameter.
 464  * @param param2 The second parameter.
 465  * @param industry The industry to do the callback for.
 466  * @param type The type of industry to do the callback for.
 467  * @param tile The tile associated with the callback.
 468  * @return The callback result.
 469  */
 470 uint16 GetIndustryCallback(CallbackID callback, uint32 param1, uint32 param2, Industry *industry, IndustryType type, TileIndex tile)
 471 {
 472         IndustriesResolverObject object(tile, industry, type, 0, callback, param1, param2);
 473         return object.ResolveCallback();
 474 }
 475
 476 /**
 477  * Check that the industry callback allows creation of the industry.
 478  * @param tile %Tile to build the industry.
 479  * @param type Type of industry to build.
 480  * @param layout Layout number.
 481  * @param seed Seed for the random generator.
 482  * @param initial_random_bits The random bits the industry is going to have after construction.
 483  * @param founder Industry founder
 484  * @param creation_type The circumstances the industry is created under.
 485  * @return Succeeded or failed command.
 486  */
 487 CommandCost CheckIfCallBackAllowsCreation(TileIndex tile, IndustryType type, uint layout, uint32 seed, uint16 initial_random_bits, Owner founder, IndustryAvailabilityCallType creation_type)
 488 {
 489         const IndustrySpec *indspec = GetIndustrySpec(type);
 490
 491         Industry ind;
 492         ind.index = INVALID_INDUSTRY;
 493         ind.location.tile = tile;
 494         ind.location.w = 0; // important to mark the industry invalid
 495         ind.type = type;
 496         ind.selected_layout = layout;
 497         ind.town = ClosestTownFromTile(tile, UINT_MAX);
 498         ind.random = initial_random_bits;
 499         ind.founder = founder;
 500         ind.psa = nullptr;
 501
 502         IndustriesResolverObject object(tile, &ind, type, seed, CBID_INDUSTRY_LOCATION, 0, creation_type);
 503         uint16 result = object.ResolveCallback();
 504
 505         /* Unlike the "normal" cases, not having a valid result means we allow
 506          * the building of the industry, as that's how it's done in TTDP. */
 507         if (result == CALLBACK_FAILED) return CommandCost();
 508
 509         return GetErrorMessageFromLocationCallbackResult(result, indspec->grf_prop.grffile, STR_ERROR_SITE_UNSUITABLE);
 510 }
 511
 512 /**
 513  * Check with callback #CBID_INDUSTRY_PROBABILITY whether the industry can be built.
 514  * @param type Industry type to check.
 515  * @param creation_type Reason to construct a new industry.
 516  * @return If the industry has no callback or allows building, \c true is returned. Otherwise, \c false is returned.
 517  */
 518 uint32 GetIndustryProbabilityCallback(IndustryType type, IndustryAvailabilityCallType creation_type, uint32 default_prob)
 519 {
 520         const IndustrySpec *indspec = GetIndustrySpec(type);
 521
 522         if (HasBit(indspec->callback_mask, CBM_IND_PROBABILITY)) {
 523                 uint16 res = GetIndustryCallback(CBID_INDUSTRY_PROBABILITY, 0, creation_type, nullptr, type, INVALID_TILE);
 524                 if (res != CALLBACK_FAILED) {
 525                         if (indspec->grf_prop.grffile->grf_version < 8) {
 526                                 /* Disallow if result != 0 */
 527                                 if (res != 0) default_prob = 0;
 528                         } else {
 529                                 /* Use returned probability. 0x100 to use default */
 530                                 if (res < 0x100) {
 531                                         default_prob = res;
 532                                 } else if (res > 0x100) {
 533                                         ErrorUnknownCallbackResult(indspec->grf_prop.grffile->grfid, CBID_INDUSTRY_PROBABILITY, res);
 534                                 }
 535                         }
 536                 }
 537         }
 538         return default_prob;
 539 }
 540
 541 static int32 DerefIndProd(int field, bool use_register)
 542 {
 543         return use_register ? (int32)GetRegister(field) : field;
 544 }
 545
 546 /**
 547  * Get the industry production callback and apply it to the industry.
 548  * @param ind    the industry this callback has to be called for
 549  * @param reason the reason it is called (0 = incoming cargo, 1 = periodic tick callback)
 550  */
 551 void IndustryProductionCallback(Industry *ind, int reason)
 552 {
 553         const IndustrySpec *spec = GetIndustrySpec(ind->type);
 554         IndustriesResolverObject object(ind->location.tile, ind, ind->type);
 555         if ((spec->behaviour & INDUSTRYBEH_PRODCALLBACK_RANDOM) != 0) object.callback_param1 = Random();
 556         int multiplier = 1;
 557         if ((spec->behaviour & INDUSTRYBEH_PROD_MULTI_HNDLING) != 0) multiplier = ind->prod_level;
 558         object.callback_param2 = reason;
 559
 560         for (uint loop = 0;; loop++) {
 561                 /* limit the number of calls to break infinite loops.
 562                  * 'loop' is provided as 16 bits to the newgrf, so abort when those are exceeded. */
 563                 if (loop >= 0x10000) {
 564                         /* display error message */
 565                         SetDParamStr(0, spec->grf_prop.grffile->filename);
 566                         SetDParam(1, spec->name);
 567                         ShowErrorMessage(STR_NEWGRF_BUGGY, STR_NEWGRF_BUGGY_ENDLESS_PRODUCTION_CALLBACK, WL_WARNING);
 568
 569                         /* abort the function early, this error isn't critical and will allow the game to continue to run */
 570                         break;
 571                 }
 572
 573                 SB(object.callback_param2, 8, 16, loop);
 574                 const SpriteGroup *tgroup = object.Resolve();
 575                 if (tgroup == nullptr || tgroup->type != SGT_INDUSTRY_PRODUCTION) break;
 576                 const IndustryProductionSpriteGroup *group = (const IndustryProductionSpriteGroup *)tgroup;
 577
 578                 bool deref = (group->version == 1);
 579
 580                 for (uint i = 0; i < 3; i++) {
 581                         ind->incoming_cargo_waiting[i] = Clamp(ind->incoming_cargo_waiting[i] - DerefIndProd(group->subtract_input[i], deref) * multiplier, 0, 0xFFFF);
 582                 }
 583                 for (uint i = 0; i < 2; i++) {
 584                         ind->produced_cargo_waiting[i] = Clamp(ind->produced_cargo_waiting[i] + max(DerefIndProd(group->add_output[i], deref), 0) * multiplier, 0, 0xFFFF);
 585                 }
 586
 587                 int32 again = DerefIndProd(group->again, deref);
 588                 if (again == 0) break;
 589
 590                 SB(object.callback_param2, 24, 8, again);
 591         }
 592
 593         SetWindowDirty(WC_INDUSTRY_VIEW, ind->index);
 594 }
 595
 596 /**
 597  * Check whether an industry temporarily refuses to accept a certain cargo.
 598  * @param ind The industry to query.
 599  * @param cargo_type The cargo to get information about.
 600  * @pre cargo_type is in ind->accepts_cargo.
 601  * @return Whether the given industry refuses to accept this cargo type.
 602  */
 603 bool IndustryTemporarilyRefusesCargo(Industry *ind, CargoID cargo_type)
 604 {
 605         assert(cargo_type == ind->accepts_cargo[0] || cargo_type == ind->accepts_cargo[1] || cargo_type == ind->accepts_cargo[2]);
 606
 607         const IndustrySpec *indspec = GetIndustrySpec(ind->type);
 608         if (HasBit(indspec->callback_mask, CBM_IND_REFUSE_CARGO)) {
 609                 uint16 res = GetIndustryCallback(CBID_INDUSTRY_REFUSE_CARGO,
 610                                 0, indspec->grf_prop.grffile->cargo_map[cargo_type],
 611                                 ind, ind->type, ind->location.tile);
 612                 if (res != CALLBACK_FAILED) return !ConvertBooleanCallback(indspec->grf_prop.grffile, CBID_INDUSTRY_REFUSE_CARGO, res);
 613         }
 614         return false;
 615 }