# subsidy.cpp

Go to the documentation of this file.

    00001 /* $Id: subsidy.cpp 18717 2010-01-04 18:21:07Z rubidium $ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
    00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
    00008  */
    00009
    00012 #include "stdafx.h"
    00013 #include "company_func.h"
    00014 #include "industry.h"
    00015 #include "town.h"
    00016 #include "news_func.h"
    00017 #include "ai/ai.hpp"
    00018 #include "station_base.h"
    00019 #include "cargotype.h"
    00020 #include "strings_func.h"
    00021 #include "window_func.h"
    00022 #include "subsidy_base.h"
    00023 #include "subsidy_func.h"
    00024 #include "core/pool_func.hpp"
    00025
    00026 #include "table/strings.h"
    00027
    00028 SubsidyPool _subsidy_pool("Subsidy");
    00029 INSTANTIATE_POOL_METHODS(Subsidy)
    00030
    00031
    00035 void Subsidy::AwardTo(CompanyID company)
    00036 {
    00037   assert(!this->IsAwarded());
    00038
    00039   this->awarded = company;
    00040   this->remaining = SUBSIDY_CONTRACT_MONTHS;
    00041
    00042   char *company_name = MallocT<char>(MAX_LENGTH_COMPANY_NAME_BYTES);
    00043   SetDParam(0, company);
    00044   GetString(company_name, STR_COMPANY_NAME, company_name + MAX_LENGTH_COMPANY_NAME_BYTES - 1);
    00045
    00046   /* Add a news item */
    00047   Pair reftype = SetupSubsidyDecodeParam(this, 0);
    00048   InjectDParam(1);
    00049
    00050   SetDParamStr(0, company_name);
    00051   AddNewsItem(
    00052     STR_NEWS_SERVICE_SUBSIDY_AWARDED_HALF + _settings_game.difficulty.subsidy_multiplier,
    00053     NS_SUBSIDIES,
    00054     (NewsReferenceType)reftype.a, this->src, (NewsReferenceType)reftype.b, this->dst,
    00055     company_name
    00056   );
    00057   AI::BroadcastNewEvent(new AIEventSubsidyAwarded(this->index));
    00058
    00059   InvalidateWindowData(WC_SUBSIDIES_LIST, 0);
    00060 }
    00061
    00065 void InitializeSubsidies()
    00066 {
    00067   _subsidy_pool.CleanPool();
    00068 }
    00069
    00070 Pair SetupSubsidyDecodeParam(const Subsidy *s, bool mode)
    00071 {
    00072   NewsReferenceType reftype1 = NR_NONE;
    00073   NewsReferenceType reftype2 = NR_NONE;
    00074
    00075   /* if mode is false, use the singular form */
    00076   const CargoSpec *cs = CargoSpec::Get(s->cargo_type);
    00077   SetDParam(0, mode ? cs->name : cs->name_single);
    00078
    00079   switch (s->src_type) {
    00080     case ST_INDUSTRY:
    00081       reftype1 = NR_INDUSTRY;
    00082       SetDParam(1, STR_INDUSTRY_NAME);
    00083       break;
    00084     case ST_TOWN:
    00085       reftype1 = NR_TOWN;
    00086       SetDParam(1, STR_TOWN_NAME);
    00087       break;
    00088     default: NOT_REACHED();
    00089   }
    00090   SetDParam(2, s->src);
    00091
    00092   switch (s->dst_type) {
    00093     case ST_INDUSTRY:
    00094       reftype2 = NR_INDUSTRY;
    00095       SetDParam(4, STR_INDUSTRY_NAME);
    00096       break;
    00097     case ST_TOWN:
    00098       reftype2 = NR_TOWN;
    00099       SetDParam(4, STR_TOWN_NAME);
    00100       break;
    00101     default: NOT_REACHED();
    00102   }
    00103   SetDParam(5, s->dst);
    00104
    00105   Pair p;
    00106   p.a = reftype1;
    00107   p.b = reftype2;
    00108   return p;
    00109 }
    00110
    00117 static inline void SetPartOfSubsidyFlag(SourceType type, SourceID index, PartOfSubsidy flag)
    00118 {
    00119   switch (type) {
    00120     case ST_INDUSTRY: Industry::Get(index)->part_of_subsidy |= flag; return;
    00121     case ST_TOWN:         Town::Get(index)->part_of_subsidy |= flag; return;
    00122     default: NOT_REACHED();
    00123   }
    00124 }
    00125
    00126 void RebuildSubsidisedSourceAndDestinationCache()
    00127 {
    00128   Town *t;
    00129   FOR_ALL_TOWNS(t) t->part_of_subsidy = POS_NONE;
    00130
    00131   Industry *i;
    00132   FOR_ALL_INDUSTRIES(i) i->part_of_subsidy = POS_NONE;
    00133
    00134   const Subsidy *s;
    00135   FOR_ALL_SUBSIDIES(s) {
    00136     SetPartOfSubsidyFlag(s->src_type, s->src, POS_SRC);
    00137     SetPartOfSubsidyFlag(s->dst_type, s->dst, POS_DST);
    00138   }
    00139 }
    00140
    00141 void DeleteSubsidyWith(SourceType type, SourceID index)
    00142 {
    00143   bool dirty = false;
    00144
    00145   Subsidy *s;
    00146   FOR_ALL_SUBSIDIES(s) {
    00147     if ((s->src_type == type && s->src == index) || (s->dst_type == type && s->dst == index)) {
    00148       delete s;
    00149       dirty = true;
    00150     }
    00151   }
    00152
    00153   if (dirty) {
    00154     InvalidateWindowData(WC_SUBSIDIES_LIST, 0);
    00155     RebuildSubsidisedSourceAndDestinationCache();
    00156   }
    00157 }
    00158
    00159 static bool CheckSubsidyDuplicate(CargoID cargo, SourceType src_type, SourceID src, SourceType dst_type, SourceID dst)
    00160 {
    00161   const Subsidy *s;
    00162   FOR_ALL_SUBSIDIES(s) {
    00163     if (s->cargo_type == cargo &&
    00164         s->src_type == src_type && s->src == src &&
    00165         s->dst_type == dst_type && s->dst == dst) {
    00166       return true;
    00167     }
    00168   }
    00169   return false;
    00170 }
    00171
    00172 static Subsidy *FindSubsidyPassengerRoute()
    00173 {
    00174   assert(Subsidy::CanAllocateItem());
    00175
    00176   const Town *src = Town::GetRandom();
    00177   if (src->population < SUBSIDY_PAX_MIN_POPULATION ||
    00178       src->pct_pass_transported > SUBSIDY_MAX_PCT_TRANSPORTED) {
    00179     return NULL;
    00180   }
    00181
    00182   const Town *dst = Town::GetRandom();
    00183   if (dst->population < SUBSIDY_PAX_MIN_POPULATION || src == dst) {
    00184     return NULL;
    00185   }
    00186
    00187   if (DistanceManhattan(src->xy, dst->xy) > SUBSIDY_MAX_DISTANCE) return NULL;
    00188   if (CheckSubsidyDuplicate(CT_PASSENGERS, ST_TOWN, src->index, ST_TOWN, dst->index)) return NULL;
    00189
    00190   Subsidy *s = new Subsidy();
    00191   s->cargo_type = CT_PASSENGERS;
    00192   s->src_type = s->dst_type = ST_TOWN;
    00193   s->src = src->index;
    00194   s->dst = dst->index;
    00195
    00196   return s;
    00197 }
    00198
    00199 static Subsidy *FindSubsidyCargoRoute()
    00200 {
    00201   assert(Subsidy::CanAllocateItem());
    00202
    00203   const Industry *i = Industry::GetRandom();
    00204   if (i == NULL) return NULL;
    00205
    00206   CargoID cargo;
    00207   int trans, total;
    00208
    00209   /* Randomize cargo type */
    00210   if (i->produced_cargo[1] != CT_INVALID && HasBit(Random(), 0)) {
    00211     cargo = i->produced_cargo[1];
    00212     trans = i->last_month_pct_transported[1];
    00213     total = i->last_month_production[1];
    00214   } else {
    00215     cargo = i->produced_cargo[0];
    00216     trans = i->last_month_pct_transported[0];
    00217     total = i->last_month_production[0];
    00218   }
    00219
    00220   /* Quit if no production in this industry
    00221    * or if the pct transported is already large enough */
    00222   if (total == 0 || trans > SUBSIDY_MAX_PCT_TRANSPORTED || cargo == CT_INVALID) return NULL;
    00223
    00224   /* Don't allow passengers subsidies from industry */
    00225   const CargoSpec *cs = CargoSpec::Get(cargo);
    00226   if (cs->town_effect == TE_PASSENGERS) return NULL;
    00227
    00228   SourceType dst_type;
    00229   SourceID dst;
    00230
    00231   if (cs->town_effect == TE_GOODS || cs->town_effect == TE_FOOD) {
    00232     /*  The destination is a town */
    00233     dst_type = ST_TOWN;
    00234     const Town *t = Town::GetRandom();
    00235
    00236     /* Only want big towns */
    00237     if (t->population < SUBSIDY_CARGO_MIN_POPULATION) return NULL;
    00238
    00239     if (DistanceManhattan(i->location.tile, t->xy) > SUBSIDY_MAX_DISTANCE) return NULL;
    00240
    00241     dst = t->index;
    00242   } else {
    00243     /* The destination is an industry */
    00244     dst_type = ST_INDUSTRY;
    00245     const Industry *i2 = Industry::GetRandom();
    00246
    00247     /* The industry must accept the cargo */
    00248     if (i2 == NULL || i == i2 ||
    00249         (cargo != i2->accepts_cargo[0] &&
    00250          cargo != i2->accepts_cargo[1] &&
    00251          cargo != i2->accepts_cargo[2])) {
    00252       return NULL;
    00253     }
    00254
    00255     if (DistanceManhattan(i->location.tile, i2->location.tile) > SUBSIDY_MAX_DISTANCE) return NULL;
    00256
    00257     dst = i2->index;
    00258   }
    00259
    00260   if (CheckSubsidyDuplicate(cargo, ST_INDUSTRY, i->index, dst_type, dst)) return NULL;
    00261
    00262   Subsidy *s = new Subsidy();
    00263   s->cargo_type = cargo;
    00264   s->src_type = ST_INDUSTRY;
    00265   s->src = i->index;
    00266   s->dst_type = dst_type;
    00267   s->dst = dst;
    00268
    00269   return s;
    00270 }
    00271
    00272 void SubsidyMonthlyLoop()
    00273 {
    00274   bool modified = false;
    00275
    00276   Subsidy *s;
    00277   FOR_ALL_SUBSIDIES(s) {
    00278     if (--s->remaining == 0) {
    00279       if (!s->IsAwarded()) {
    00280         Pair reftype = SetupSubsidyDecodeParam(s, 1);
    00281         AddNewsItem(STR_NEWS_OFFER_OF_SUBSIDY_EXPIRED, NS_SUBSIDIES, (NewsReferenceType)reftype.a, s->src, (NewsReferenceType)reftype.b, s->dst);
    00282         AI::BroadcastNewEvent(new AIEventSubsidyOfferExpired(s->index));
    00283       } else {
    00284         if (s->awarded == _local_company) {
    00285           Pair reftype = SetupSubsidyDecodeParam(s, 1);
    00286           AddNewsItem(STR_NEWS_SUBSIDY_WITHDRAWN_SERVICE, NS_SUBSIDIES, (NewsReferenceType)reftype.a, s->src, (NewsReferenceType)reftype.b, s->dst);
    00287         }
    00288         AI::BroadcastNewEvent(new AIEventSubsidyExpired(s->index));
    00289       }
    00290       delete s;
    00291       modified = true;
    00292     }
    00293   }
    00294
    00295   if (modified) RebuildSubsidisedSourceAndDestinationCache();
    00296
    00297   /* 25% chance to go on */
    00298   if (Subsidy::CanAllocateItem() && Chance16(1, 4)) {
    00299     uint n = 1000;
    00300     do {
    00301       Subsidy *s = FindSubsidyPassengerRoute();
    00302       if (s == NULL) s = FindSubsidyCargoRoute();
    00303       if (s != NULL) {
    00304         s->remaining = SUBSIDY_OFFER_MONTHS;
    00305         s->awarded = INVALID_COMPANY;
    00306         Pair reftype = SetupSubsidyDecodeParam(s, 0);
    00307         AddNewsItem(STR_NEWS_SERVICE_SUBSIDY_OFFERED, NS_SUBSIDIES, (NewsReferenceType)reftype.a, s->src, (NewsReferenceType)reftype.b, s->dst);
    00308         SetPartOfSubsidyFlag(s->src_type, s->src, POS_SRC);
    00309         SetPartOfSubsidyFlag(s->dst_type, s->dst, POS_DST);
    00310         AI::BroadcastNewEvent(new AIEventSubsidyOffer(s->index));
    00311         modified = true;
    00312         break;
    00313       }
    00314     } while (n--);
    00315   }
    00316
    00317   if (modified) InvalidateWindowData(WC_SUBSIDIES_LIST, 0);
    00318 }
    00319
    00329 bool CheckSubsidised(CargoID cargo_type, CompanyID company, SourceType src_type, SourceID src, const Station *st)
    00330 {
    00331   /* If the source isn't subsidised, don't continue */
    00332   if (src == INVALID_SOURCE) return false;
    00333   switch (src_type) {
    00334     case ST_INDUSTRY:
    00335       if (!(Industry::Get(src)->part_of_subsidy & POS_SRC)) return false;
    00336       break;
    00337     case ST_TOWN:
    00338       if (!(    Town::Get(src)->part_of_subsidy & POS_SRC)) return false;
    00339       break;
    00340     default: return false;
    00341   }
    00342
    00343   /* Remember all towns near this station (at least one house in its catchment radius)
    00344    * which are destination of subsidised path. Do that only if needed */
    00345   SmallVector<const Town *, 2> towns_near;
    00346   if (!st->rect.IsEmpty()) {
    00347     Subsidy *s;
    00348     FOR_ALL_SUBSIDIES(s) {
    00349       /* Don't create the cache if there is no applicable subsidy with town as destination */
    00350       if (s->dst_type != ST_TOWN) continue;
    00351       if (s->cargo_type != cargo_type || s->src_type != src_type || s->src != src) continue;
    00352       if (s->IsAwarded() && s->awarded != company) continue;
    00353
    00354       Rect rect = st->GetCatchmentRect();
    00355
    00356       for (int y = rect.top; y <= rect.bottom; y++) {
    00357         for (int x = rect.left; x <= rect.right; x++) {
    00358           TileIndex tile = TileXY(x, y);
    00359           if (!IsTileType(tile, MP_HOUSE)) continue;
    00360           const Town *t = Town::GetByTile(tile);
    00361           if (t->part_of_subsidy & POS_DST) towns_near.Include(t);
    00362         }
    00363       }
    00364       break;
    00365     }
    00366   }
    00367
    00368   bool subsidised = false;
    00369
    00370   /* Check if there's a (new) subsidy that applies. There can be more subsidies triggered by this delivery!
    00371    * Think about the case that subsidies are A->B and A->C and station has both B and C in its catchment area */
    00372   Subsidy *s;
    00373   FOR_ALL_SUBSIDIES(s) {
    00374     if (s->cargo_type == cargo_type && s->src_type == src_type && s->src == src && (!s->IsAwarded() || s->awarded == company)) {
    00375       switch (s->dst_type) {
    00376         case ST_INDUSTRY:
    00377           for (const Industry * const *ip = st->industries_near.Begin(); ip != st->industries_near.End(); ip++) {
    00378             if (s->dst == (*ip)->index) {
    00379               assert((*ip)->part_of_subsidy & POS_DST);
    00380               subsidised = true;
    00381               if (!s->IsAwarded()) s->AwardTo(company);
    00382             }
    00383           }
    00384           break;
    00385         case ST_TOWN:
    00386           for (const Town * const *tp = towns_near.Begin(); tp != towns_near.End(); tp++) {
    00387             if (s->dst == (*tp)->index) {
    00388               assert((*tp)->part_of_subsidy & POS_DST);
    00389               subsidised = true;
    00390               if (!s->IsAwarded()) s->AwardTo(company);
    00391             }
    00392           }
    00393           break;
    00394         default:
    00395           NOT_REACHED();
    00396       }
    00397     }
    00398   }
    00399
    00400   return subsidised;
    00401 }