src/subsidy.cpp

   1 /* $Id: subsidy.cpp 25882 2013-10-19 11:17:29Z fonsinchen $ */
   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 subsidy.cpp Handling of subsidies. */
  11
  12 #include "stdafx.h"
  13 #include "company_func.h"
  14 #include "industry.h"
  15 #include "town.h"
  16 #include "news_func.h"
  17 #include "ai/ai.hpp"
  18 #include "station_base.h"
  19 #include "strings_func.h"
  20 #include "window_func.h"
  21 #include "subsidy_base.h"
  22 #include "subsidy_func.h"
  23 #include "core/pool_func.hpp"
  24 #include "core/random_func.hpp"
  25 #include "game/game.hpp"
  26 #include "command_func.h"
  27 #include "string_func.h"
  28
  29 #include "table/strings.h"
  30
  31 #include "safeguards.h"
  32
  33 SubsidyPool _subsidy_pool("Subsidy"); ///< Pool for the subsidies.
  34 INSTANTIATE_POOL_METHODS(Subsidy)
  35
  36 /**
  37  * Marks subsidy as awarded, creates news and AI event
  38  * @param company awarded company
  39  */
  40 void Subsidy::AwardTo(CompanyID company)
  41 {
  42         assert(!this->IsAwarded());
  43
  44         this->awarded = company;
  45         this->remaining = SUBSIDY_CONTRACT_MONTHS;
  46
  47         char company_name[MAX_LENGTH_COMPANY_NAME_CHARS * MAX_CHAR_LENGTH];
  48         SetDParam(0, company);
  49         GetString(company_name, STR_COMPANY_NAME, lastof(company_name));
  50
  51         char *cn = stredup(company_name);
  52
  53         /* Add a news item */
  54         Pair reftype = SetupSubsidyDecodeParam(this, false);
  55         InjectDParam(1);
  56
  57         SetDParamStr(0, cn);
  58         AddNewsItem(
  59                 STR_NEWS_SERVICE_SUBSIDY_AWARDED_HALF + _settings_game.difficulty.subsidy_multiplier,
  60                 NT_SUBSIDIES, NF_NORMAL,
  61                 (NewsReferenceType)reftype.a, this->src, (NewsReferenceType)reftype.b, this->dst,
  62                 cn
  63         );
  64         AI::BroadcastNewEvent(new ScriptEventSubsidyAwarded(this->index));
  65         Game::NewEvent(new ScriptEventSubsidyAwarded(this->index));
  66
  67         InvalidateWindowData(WC_SUBSIDIES_LIST, 0);
  68 }
  69
  70 /**
  71  * Setup the string parameters for printing the subsidy at the screen, and compute the news reference for the subsidy.
  72  * @param s %Subsidy being printed.
  73  * @param mode Unit of cargo used, \c true means general name, \c false means singular form.
  74  * @return Reference of the subsidy in the news system.
  75  */
  76 Pair SetupSubsidyDecodeParam(const Subsidy *s, bool mode)
  77 {
  78         NewsReferenceType reftype1 = NR_NONE;
  79         NewsReferenceType reftype2 = NR_NONE;
  80
  81         /* if mode is false, use the singular form */
  82         const CargoSpec *cs = CargoSpec::Get(s->cargo_type);
  83         SetDParam(0, mode ? cs->name : cs->name_single);
  84
  85         switch (s->src_type) {
  86                 case ST_INDUSTRY:
  87                         reftype1 = NR_INDUSTRY;
  88                         SetDParam(1, STR_INDUSTRY_NAME);
  89                         break;
  90                 case ST_TOWN:
  91                         reftype1 = NR_TOWN;
  92                         SetDParam(1, STR_TOWN_NAME);
  93                         break;
  94                 default: NOT_REACHED();
  95         }
  96         SetDParam(2, s->src);
  97
  98         switch (s->dst_type) {
  99                 case ST_INDUSTRY:
 100                         reftype2 = NR_INDUSTRY;
 101                         SetDParam(4, STR_INDUSTRY_NAME);
 102                         break;
 103                 case ST_TOWN:
 104                         reftype2 = NR_TOWN;
 105                         SetDParam(4, STR_TOWN_NAME);
 106                         break;
 107                 default: NOT_REACHED();
 108         }
 109         SetDParam(5, s->dst);
 110
 111         Pair p;
 112         p.a = reftype1;
 113         p.b = reftype2;
 114         return p;
 115 }
 116
 117 /**
 118  * Sets a flag indicating that given town/industry is part of subsidised route.
 119  * @param type is it a town or an industry?
 120  * @param index index of town/industry
 121  * @param flag flag to set
 122  */
 123 static inline void SetPartOfSubsidyFlag(SourceType type, SourceID index, PartOfSubsidy flag)
 124 {
 125         switch (type) {
 126                 case ST_INDUSTRY: Industry::Get(index)->part_of_subsidy |= flag; return;
 127                 case ST_TOWN:   Town::Get(index)->cache.part_of_subsidy |= flag; return;
 128                 default: NOT_REACHED();
 129         }
 130 }
 131
 132 /** Perform a full rebuild of the subsidies cache. */
 133 void RebuildSubsidisedSourceAndDestinationCache()
 134 {
 135         Town *t;
 136         FOR_ALL_TOWNS(t) t->cache.part_of_subsidy = POS_NONE;
 137
 138         Industry *i;
 139         FOR_ALL_INDUSTRIES(i) i->part_of_subsidy = POS_NONE;
 140
 141         const Subsidy *s;
 142         FOR_ALL_SUBSIDIES(s) {
 143                 SetPartOfSubsidyFlag(s->src_type, s->src, POS_SRC);
 144                 SetPartOfSubsidyFlag(s->dst_type, s->dst, POS_DST);
 145         }
 146 }
 147
 148 /**
 149  * Delete the subsidies associated with a given cargo source type and id.
 150  * @param type  Cargo source type of the id.
 151  * @param index Id to remove.
 152  */
 153 void DeleteSubsidyWith(SourceType type, SourceID index)
 154 {
 155         bool dirty = false;
 156
 157         Subsidy *s;
 158         FOR_ALL_SUBSIDIES(s) {
 159                 if ((s->src_type == type && s->src == index) || (s->dst_type == type && s->dst == index)) {
 160                         delete s;
 161                         dirty = true;
 162                 }
 163         }
 164
 165         if (dirty) {
 166                 InvalidateWindowData(WC_SUBSIDIES_LIST, 0);
 167                 RebuildSubsidisedSourceAndDestinationCache();
 168         }
 169 }
 170
 171 /**
 172  * Check whether a specific subsidy already exists.
 173  * @param cargo Cargo type.
 174  * @param src_type Type of source of the cargo, affects interpretation of \a src.
 175  * @param src Id of the source.
 176  * @param dst_type Type of the destination of the cargo, affects interpretation of \a dst.
 177  * @param dst Id of the destination.
 178  * @return \c true if the subsidy already exists, \c false if not.
 179  */
 180 static bool CheckSubsidyDuplicate(CargoID cargo, SourceType src_type, SourceID src, SourceType dst_type, SourceID dst)
 181 {
 182         const Subsidy *s;
 183         FOR_ALL_SUBSIDIES(s) {
 184                 if (s->cargo_type == cargo &&
 185                                 s->src_type == src_type && s->src == src &&
 186                                 s->dst_type == dst_type && s->dst == dst) {
 187                         return true;
 188                 }
 189         }
 190         return false;
 191 }
 192
 193 /**
 194  * Checks if the source and destination of a subsidy are inside the distance limit.
 195  * @param src_type Type of \a src.
 196  * @param src      Index of source.
 197  * @param dst_type Type of \a dst.
 198  * @param dst      Index of destination.
 199  * @return True if they are inside the distance limit.
 200  */
 201 static bool CheckSubsidyDistance(SourceType src_type, SourceID src, SourceType dst_type, SourceID dst)
 202 {
 203         TileIndex tile_src = (src_type == ST_TOWN) ? Town::Get(src)->xy : Industry::Get(src)->location.tile;
 204         TileIndex tile_dst = (dst_type == ST_TOWN) ? Town::Get(dst)->xy : Industry::Get(dst)->location.tile;
 205
 206         return (DistanceManhattan(tile_src, tile_dst) <= SUBSIDY_MAX_DISTANCE);
 207 }
 208
 209 /**
 210  * Creates a subsidy with the given parameters.
 211  * @param cid      Subsidised cargo.
 212  * @param src_type Type of \a src.
 213  * @param src      Index of source.
 214  * @param dst_type Type of \a dst.
 215  * @param dst      Index of destination.
 216  */
 217 void CreateSubsidy(CargoID cid, SourceType src_type, SourceID src, SourceType dst_type, SourceID dst)
 218 {
 219         Subsidy *s = new Subsidy();
 220         s->cargo_type = cid;
 221         s->src_type = src_type;
 222         s->src = src;
 223         s->dst_type = dst_type;
 224         s->dst = dst;
 225         s->remaining = SUBSIDY_OFFER_MONTHS;
 226         s->awarded = INVALID_COMPANY;
 227
 228         Pair reftype = SetupSubsidyDecodeParam(s, false);
 229         AddNewsItem(STR_NEWS_SERVICE_SUBSIDY_OFFERED, NT_SUBSIDIES, NF_NORMAL, (NewsReferenceType)reftype.a, s->src, (NewsReferenceType)reftype.b, s->dst);
 230         SetPartOfSubsidyFlag(s->src_type, s->src, POS_SRC);
 231         SetPartOfSubsidyFlag(s->dst_type, s->dst, POS_DST);
 232         AI::BroadcastNewEvent(new ScriptEventSubsidyOffer(s->index));
 233         Game::NewEvent(new ScriptEventSubsidyOffer(s->index));
 234
 235         InvalidateWindowData(WC_SUBSIDIES_LIST, 0);
 236 }
 237
 238 /**
 239  * Create a new subsidy.
 240  * @param tile unused.
 241  * @param flags type of operation
 242  * @param p1 various bitstuffed elements
 243  * - p1 = (bit  0 -  7) - SourceType of source.
 244  * - p1 = (bit  8 - 23) - SourceID of source.
 245  * - p1 = (bit 24 - 31) - CargoID of subsidy.
 246  * @param p2 various bitstuffed elements
 247  * - p2 = (bit  0 -  7) - SourceType of destination.
 248  * - p2 = (bit  8 - 23) - SourceID of destination.
 249  * @param text unused.
 250  * @return the cost of this operation or an error
 251  */
 252 CommandCost CmdCreateSubsidy(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
 253 {
 254         if (!Subsidy::CanAllocateItem()) return CMD_ERROR;
 255
 256         CargoID cid = GB(p1, 24, 8);
 257         SourceType src_type = (SourceType)GB(p1, 0, 8);
 258         SourceID src = GB(p1, 8, 16);
 259         SourceType dst_type = (SourceType)GB(p2, 0, 8);
 260         SourceID dst = GB(p2, 8, 16);
 261
 262         if (_current_company != OWNER_DEITY) return CMD_ERROR;
 263
 264         if (cid >= NUM_CARGO || !::CargoSpec::Get(cid)->IsValid()) return CMD_ERROR;
 265
 266         switch (src_type) {
 267                 case ST_TOWN:
 268                         if (!Town::IsValidID(src)) return CMD_ERROR;
 269                         break;
 270                 case ST_INDUSTRY:
 271                         if (!Industry::IsValidID(src)) return CMD_ERROR;
 272                         break;
 273                 default:
 274                         return CMD_ERROR;
 275         }
 276         switch (dst_type) {
 277                 case ST_TOWN:
 278                         if (!Town::IsValidID(dst)) return CMD_ERROR;
 279                         break;
 280                 case ST_INDUSTRY:
 281                         if (!Industry::IsValidID(dst)) return CMD_ERROR;
 282                         break;
 283                 default:
 284                         return CMD_ERROR;
 285         }
 286
 287         if (flags & DC_EXEC) {
 288                 CreateSubsidy(cid, src_type, src, dst_type, dst);
 289         }
 290
 291         return CommandCost();
 292 }
 293
 294 /**
 295  * Tries to create a passenger subsidy between two towns.
 296  * @return True iff the subsidy was created.
 297  */
 298 bool FindSubsidyPassengerRoute()
 299 {
 300         if (!Subsidy::CanAllocateItem()) return false;
 301
 302         const Town *src = Town::GetRandom();
 303         if (src->cache.population < SUBSIDY_PAX_MIN_POPULATION ||
 304                         src->GetPercentTransported(CT_PASSENGERS) > SUBSIDY_MAX_PCT_TRANSPORTED) {
 305                 return false;
 306         }
 307
 308         const Town *dst = Town::GetRandom();
 309         if (dst->cache.population < SUBSIDY_PAX_MIN_POPULATION || src == dst) {
 310                 return false;
 311         }
 312
 313         if (DistanceManhattan(src->xy, dst->xy) > SUBSIDY_MAX_DISTANCE) return false;
 314         if (CheckSubsidyDuplicate(CT_PASSENGERS, ST_TOWN, src->index, ST_TOWN, dst->index)) return false;
 315
 316         CreateSubsidy(CT_PASSENGERS, ST_TOWN, src->index, ST_TOWN, dst->index);
 317
 318         return true;
 319 }
 320
 321 bool FindSubsidyCargoDestination(CargoID cid, SourceType src_type, SourceID src);
 322
 323
 324 /**
 325  * Tries to create a cargo subsidy with a town as source.
 326  * @return True iff the subsidy was created.
 327  */
 328 bool FindSubsidyTownCargoRoute()
 329 {
 330         if (!Subsidy::CanAllocateItem()) return false;
 331
 332         SourceType src_type = ST_TOWN;
 333
 334         /* Select a random town. */
 335         const Town *src_town = Town::GetRandom();
 336
 337         uint32 town_cargo_produced = src_town->cargo_produced;
 338
 339         /* Passenger subsidies are not handled here. */
 340         ClrBit(town_cargo_produced, CT_PASSENGERS);
 341
 342         /* No cargo produced at all? */
 343         if (town_cargo_produced == 0) return false;
 344
 345         /* Choose a random cargo that is produced in the town. */
 346         uint8 cargo_number = RandomRange(CountBits(town_cargo_produced));
 347         CargoID cid;
 348         FOR_EACH_SET_CARGO_ID(cid, town_cargo_produced) {
 349                 if (cargo_number == 0) break;
 350                 cargo_number--;
 351         }
 352
 353         /* Avoid using invalid NewGRF cargoes. */
 354         if (!CargoSpec::Get(cid)->IsValid()) {
 355                 return false;
 356         }
 357
 358         /* Quit if the percentage transported is large enough. */
 359         if (src_town->GetPercentTransported(cid) > SUBSIDY_MAX_PCT_TRANSPORTED) return false;
 360
 361         SourceID src = src_town->index;
 362
 363         return FindSubsidyCargoDestination(cid, src_type, src);
 364 }
 365
 366 /**
 367  * Tries to create a cargo subsidy with an industry as source.
 368  * @return True iff the subsidy was created.
 369  */
 370 bool FindSubsidyIndustryCargoRoute()
 371 {
 372         if (!Subsidy::CanAllocateItem()) return false;
 373
 374         SourceType src_type = ST_INDUSTRY;
 375
 376         /* Select a random industry. */
 377         const Industry *src_ind = Industry::GetRandom();
 378         if (src_ind == NULL) return false;
 379
 380         uint trans, total;
 381
 382         CargoID cid;
 383
 384         /* Randomize cargo type */
 385         if (src_ind->produced_cargo[1] != CT_INVALID && HasBit(Random(), 0)) {
 386                 cid = src_ind->produced_cargo[1];
 387                 trans = src_ind->last_month_pct_transported[1];
 388                 total = src_ind->last_month_production[1];
 389         } else {
 390                 cid = src_ind->produced_cargo[0];
 391                 trans = src_ind->last_month_pct_transported[0];
 392                 total = src_ind->last_month_production[0];
 393         }
 394
 395         /* Quit if no production in this industry
 396          * or if the pct transported is already large enough
 397          * or if the cargo is automatically distributed */
 398         if (total == 0 || trans > SUBSIDY_MAX_PCT_TRANSPORTED || cid == CT_INVALID) {
 399                 return false;
 400         }
 401
 402         SourceID src = src_ind->index;
 403
 404         return FindSubsidyCargoDestination(cid, src_type, src);
 405 }
 406
 407 /**
 408  * Tries to find a suitable destination for the given source and cargo.
 409  * @param cid      Subsidized cargo.
 410  * @param src_type Type of \a src.
 411  * @param src      Index of source.
 412  * @return True iff the subsidy was created.
 413  */
 414 bool FindSubsidyCargoDestination(CargoID cid, SourceType src_type, SourceID src)
 415 {
 416         /* Choose a random destination. Only consider towns if they can accept the cargo. */
 417         SourceType dst_type = (HasBit(_town_cargoes_accepted, cid) && Chance16(1, 2)) ? ST_TOWN : ST_INDUSTRY;
 418
 419         SourceID dst;
 420         switch (dst_type) {
 421                 case ST_TOWN: {
 422                         /* Select a random town. */
 423                         const Town *dst_town = Town::GetRandom();
 424
 425                         /* Check if the town can accept this cargo. */
 426                         if (!HasBit(dst_town->cargo_accepted_total, cid)) return false;
 427
 428                         dst = dst_town->index;
 429                         break;
 430                 }
 431
 432                 case ST_INDUSTRY: {
 433                         /* Select a random industry. */
 434                         const Industry *dst_ind = Industry::GetRandom();
 435
 436                         /* The industry must accept the cargo */
 437                         if (dst_ind == NULL ||
 438                                         (cid != dst_ind->accepts_cargo[0] &&
 439                                          cid != dst_ind->accepts_cargo[1] &&
 440                                          cid != dst_ind->accepts_cargo[2])) {
 441                                 return false;
 442                         }
 443
 444                         dst = dst_ind->index;
 445                         break;
 446                 }
 447
 448                 default: NOT_REACHED();
 449         }
 450
 451         /* Check that the source and the destination are not the same. */
 452         if (src_type == dst_type && src == dst) return false;
 453
 454         /* Check distance between source and destination. */
 455         if (!CheckSubsidyDistance(src_type, src, dst_type, dst)) return false;
 456
 457         /* Avoid duplicate subsidies. */
 458         if (CheckSubsidyDuplicate(cid, src_type, src, dst_type, dst)) return false;
 459
 460         CreateSubsidy(cid, src_type, src, dst_type, dst);
 461
 462         return true;
 463 }
 464
 465 /** Perform the monthly update of open subsidies, and try to create a new one. */
 466 void SubsidyMonthlyLoop()
 467 {
 468         bool modified = false;
 469
 470         Subsidy *s;
 471         FOR_ALL_SUBSIDIES(s) {
 472                 if (--s->remaining == 0) {
 473                         if (!s->IsAwarded()) {
 474                                 Pair reftype = SetupSubsidyDecodeParam(s, true);
 475                                 AddNewsItem(STR_NEWS_OFFER_OF_SUBSIDY_EXPIRED, NT_SUBSIDIES, NF_NORMAL, (NewsReferenceType)reftype.a, s->src, (NewsReferenceType)reftype.b, s->dst);
 476                                 AI::BroadcastNewEvent(new ScriptEventSubsidyOfferExpired(s->index));
 477                                 Game::NewEvent(new ScriptEventSubsidyOfferExpired(s->index));
 478                         } else {
 479                                 if (s->awarded == _local_company) {
 480                                         Pair reftype = SetupSubsidyDecodeParam(s, true);
 481                                         AddNewsItem(STR_NEWS_SUBSIDY_WITHDRAWN_SERVICE, NT_SUBSIDIES, NF_NORMAL, (NewsReferenceType)reftype.a, s->src, (NewsReferenceType)reftype.b, s->dst);
 482                                 }
 483                                 AI::BroadcastNewEvent(new ScriptEventSubsidyExpired(s->index));
 484                                 Game::NewEvent(new ScriptEventSubsidyExpired(s->index));
 485                         }
 486                         delete s;
 487                         modified = true;
 488                 }
 489         }
 490
 491         if (modified) {
 492                 RebuildSubsidisedSourceAndDestinationCache();
 493         }
 494
 495         bool passenger_subsidy = false;
 496         bool town_subsidy = false;
 497         bool industry_subsidy = false;
 498
 499         int random_chance = RandomRange(16);
 500
 501         if (random_chance < 2) {
 502                 /* There is a 1/8 chance each month of generating a passenger subsidy. */
 503                 int n = 1000;
 504
 505                 do {
 506                         passenger_subsidy = FindSubsidyPassengerRoute();
 507                 } while (!passenger_subsidy && n--);
 508         } else if (random_chance == 2) {
 509                 /* Cargo subsidies with a town as a source have a 1/16 chance. */
 510                 int n = 1000;
 511
 512                 do {
 513                         town_subsidy = FindSubsidyTownCargoRoute();
 514                 } while (!town_subsidy && n--);
 515         } else if (random_chance == 3) {
 516                 /* Cargo subsidies with an industry as a source have a 1/16 chance. */
 517                 int n = 1000;
 518
 519                 do {
 520                         industry_subsidy = FindSubsidyIndustryCargoRoute();
 521                 } while (!industry_subsidy && n--);
 522         }
 523
 524         modified |= passenger_subsidy || town_subsidy || industry_subsidy;
 525
 526         if (modified) InvalidateWindowData(WC_SUBSIDIES_LIST, 0);
 527 }
 528
 529 /**
 530  * Tests whether given delivery is subsidised and possibly awards the subsidy to delivering company
 531  * @param cargo_type type of cargo
 532  * @param company company delivering the cargo
 533  * @param src_type type of \a src
 534  * @param src index of source
 535  * @param st station where the cargo is delivered to
 536  * @return is the delivery subsidised?
 537  */
 538 bool CheckSubsidised(CargoID cargo_type, CompanyID company, SourceType src_type, SourceID src, const Station *st)
 539 {
 540         /* If the source isn't subsidised, don't continue */
 541         if (src == INVALID_SOURCE) return false;
 542         switch (src_type) {
 543                 case ST_INDUSTRY:
 544                         if (!(Industry::Get(src)->part_of_subsidy & POS_SRC)) return false;
 545                         break;
 546                 case ST_TOWN:
 547                         if (!(Town::Get(src)->cache.part_of_subsidy & POS_SRC)) return false;
 548                         break;
 549                 default: return false;
 550         }
 551
 552         /* Remember all towns near this station (at least one house in its catchment radius)
 553          * which are destination of subsidised path. Do that only if needed */
 554         SmallVector<const Town *, 2> towns_near;
 555         if (!st->rect.IsEmpty()) {
 556                 Subsidy *s;
 557                 FOR_ALL_SUBSIDIES(s) {
 558                         /* Don't create the cache if there is no applicable subsidy with town as destination */
 559                         if (s->dst_type != ST_TOWN) continue;
 560                         if (s->cargo_type != cargo_type || s->src_type != src_type || s->src != src) continue;
 561                         if (s->IsAwarded() && s->awarded != company) continue;
 562
 563                         Rect rect = st->GetCatchmentRect();
 564
 565                         for (int y = rect.top; y <= rect.bottom; y++) {
 566                                 for (int x = rect.left; x <= rect.right; x++) {
 567                                         TileIndex tile = TileXY(x, y);
 568                                         if (!IsTileType(tile, MP_HOUSE)) continue;
 569                                         const Town *t = Town::GetByTile(tile);
 570                                         if (t->cache.part_of_subsidy & POS_DST) towns_near.Include(t);
 571                                 }
 572                         }
 573                         break;
 574                 }
 575         }
 576
 577         bool subsidised = false;
 578
 579         /* Check if there's a (new) subsidy that applies. There can be more subsidies triggered by this delivery!
 580          * Think about the case that subsidies are A->B and A->C and station has both B and C in its catchment area */
 581         Subsidy *s;
 582         FOR_ALL_SUBSIDIES(s) {
 583                 if (s->cargo_type == cargo_type && s->src_type == src_type && s->src == src && (!s->IsAwarded() || s->awarded == company)) {
 584                         switch (s->dst_type) {
 585                                 case ST_INDUSTRY:
 586                                         for (const Industry * const *ip = st->industries_near.Begin(); ip != st->industries_near.End(); ip++) {
 587                                                 if (s->dst == (*ip)->index) {
 588                                                         assert((*ip)->part_of_subsidy & POS_DST);
 589                                                         subsidised = true;
 590                                                         if (!s->IsAwarded()) s->AwardTo(company);
 591                                                 }
 592                                         }
 593                                         break;
 594                                 case ST_TOWN:
 595                                         for (const Town * const *tp = towns_near.Begin(); tp != towns_near.End(); tp++) {
 596                                                 if (s->dst == (*tp)->index) {
 597                                                         assert((*tp)->cache.part_of_subsidy & POS_DST);
 598                                                         subsidised = true;
 599                                                         if (!s->IsAwarded()) s->AwardTo(company);
 600                                                 }
 601                                         }
 602                                         break;
 603                                 default:
 604                                         NOT_REACHED();
 605                         }
 606                 }
 607         }
 608
 609         return subsidised;
 610 }