# town_cmd.cpp

Go to the documentation of this file.

    00001 /* $Id$ */
    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 "openttd.h"
    00014 #include "road_type.h"
    00015 #include "road_internal.h" /* Cleaning up road bits */
    00016 #include "road_cmd.h"
    00017 #include "landscape.h"
    00018 #include "viewport_func.h"
    00019 #include "command_func.h"
    00020 #include "industry.h"
    00021 #include "station_base.h"
    00022 #include "company_base.h"
    00023 #include "news_func.h"
    00024 #include "gui.h"
    00025 #include "unmovable_map.h"
    00026 #include "variables.h"
    00027 #include "genworld.h"
    00028 #include "newgrf.h"
    00029 #include "newgrf_house.h"
    00030 #include "newgrf_commons.h"
    00031 #include "newgrf_text.h"
    00032 #include "autoslope.h"
    00033 #include "transparency.h"
    00034 #include "tunnelbridge_map.h"
    00035 #include "strings_func.h"
    00036 #include "window_func.h"
    00037 #include "string_func.h"
    00038 #include "newgrf_cargo.h"
    00039 #include "cheat_type.h"
    00040 #include "functions.h"
    00041 #include "animated_tile_func.h"
    00042 #include "date_func.h"
    00043 #include "subsidy_func.h"
    00044 #include "core/smallmap_type.hpp"
    00045 #include "core/pool_func.hpp"
    00046 #include "town.h"
    00047 #include "townname_func.h"
    00048 #include "townname_type.h"
    00049
    00050 #include "table/strings.h"
    00051 #include "table/town_land.h"
    00052
    00053 static Town *_cleared_town;
    00054 static int _cleared_town_rating;
    00055 TownID _new_town_id;
    00056
    00057 /* Initialize the town-pool */
    00058 TownPool _town_pool("Town");
    00059 INSTANTIATE_POOL_METHODS(Town)
    00060
    00061 Town::~Town()
    00062 {
    00063   free(this->name);
    00064
    00065   if (CleaningPool()) return;
    00066
    00067   Industry *i;
    00068
    00069   /* Delete town authority window
    00070    * and remove from list of sorted towns */
    00071   DeleteWindowById(WC_TOWN_VIEW, this->index);
    00072
    00073   /* Delete all industries belonging to the town */
    00074   FOR_ALL_INDUSTRIES(i) if (i->town == this) delete i;
    00075
    00076   /* Go through all tiles and delete those belonging to the town */
    00077   for (TileIndex tile = 0; tile < MapSize(); ++tile) {
    00078     switch (GetTileType(tile)) {
    00079       case MP_HOUSE:
    00080         if (Town::GetByTile(tile) == this) DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
    00081         break;
    00082
    00083       case MP_ROAD:
    00084         /* Cached nearest town is updated later (after this town has been deleted) */
    00085         if (HasTownOwnedRoad(tile) && GetTownIndex(tile) == this->index) {
    00086           DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
    00087         }
    00088         break;
    00089
    00090       case MP_TUNNELBRIDGE:
    00091         if (IsTileOwner(tile, OWNER_TOWN) &&
    00092             ClosestTownFromTile(tile, UINT_MAX) == this)
    00093           DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
    00094         break;
    00095
    00096       default:
    00097         break;
    00098     }
    00099   }
    00100
    00101   DeleteSubsidyWith(ST_TOWN, this->index);
    00102   CargoPacket::InvalidateAllFrom(ST_TOWN, this->index);
    00103   MarkWholeScreenDirty();
    00104 }
    00105
    00106
    00112 void Town::PostDestructor(size_t index)
    00113 {
    00114   InvalidateWindowData(WC_TOWN_DIRECTORY, 0, 0);
    00115   UpdateNearestTownForRoadTiles(false);
    00116 }
    00117
    00121 void Town::InitializeLayout(TownLayout layout)
    00122 {
    00123   if (layout != TL_RANDOM) {
    00124     this->layout = layout;
    00125     return;
    00126   }
    00127
    00128   this->layout = TileHash(TileX(this->xy), TileY(this->xy)) % (NUM_TLS - 1);
    00129 }
    00130
    00135 /* static */ Town *Town::GetRandom()
    00136 {
    00137   if (Town::GetNumItems() == 0) return NULL;
    00138   int num = RandomRange((uint16)Town::GetNumItems());
    00139   size_t index = MAX_UVALUE(size_t);
    00140
    00141   while (num >= 0) {
    00142     num--;
    00143     index++;
    00144
    00145     /* Make sure we have a valid town */
    00146     while (!Town::IsValidID(index)) {
    00147       index++;
    00148       assert(index < Town::GetPoolSize());
    00149     }
    00150   }
    00151
    00152   return Town::Get(index);
    00153 }
    00154
    00155 Money HouseSpec::GetRemovalCost() const
    00156 {
    00157   return (_price[PR_CLEAR_HOUSE] * this->removal_cost) >> 8;
    00158 }
    00159
    00160 // Local
    00161 static int _grow_town_result;
    00162
    00163 /* Describe the possible states */
    00164 enum TownGrowthResult {
    00165   GROWTH_SUCCEED         = -1,
    00166   GROWTH_SEARCH_STOPPED  =  0
    00167 //  GROWTH_SEARCH_RUNNING >=  1
    00168 };
    00169
    00170 static bool BuildTownHouse(Town *t, TileIndex tile);
    00171 static Town *CreateRandomTown(uint attempts, uint32 townnameparts, TownSize size, bool city, TownLayout layout);
    00172
    00173 static void TownDrawHouseLift(const TileInfo *ti)
    00174 {
    00175   AddChildSpriteScreen(SPR_LIFT, PAL_NONE, 14, 60 - GetLiftPosition(ti->tile));
    00176 }
    00177
    00178 typedef void TownDrawTileProc(const TileInfo *ti);
    00179 static TownDrawTileProc * const _town_draw_tile_procs[1] = {
    00180   TownDrawHouseLift
    00181 };
    00182
    00188 static inline DiagDirection RandomDiagDir()
    00189 {
    00190   return (DiagDirection)(3 & Random());
    00191 }
    00192
    00198 static void DrawTile_Town(TileInfo *ti)
    00199 {
    00200   HouseID house_id = GetHouseType(ti->tile);
    00201
    00202   if (house_id >= NEW_HOUSE_OFFSET) {
    00203     /* Houses don't necessarily need new graphics. If they don't have a
    00204      * spritegroup associated with them, then the sprite for the substitute
    00205      * house id is drawn instead. */
    00206     if (HouseSpec::Get(house_id)->spritegroup != NULL) {
    00207       DrawNewHouseTile(ti, house_id);
    00208       return;
    00209     } else {
    00210       house_id = HouseSpec::Get(house_id)->substitute_id;
    00211     }
    00212   }
    00213
    00214   /* Retrieve pointer to the draw town tile struct */
    00215   const DrawBuildingsTileStruct *dcts = &_town_draw_tile_data[house_id << 4 | TileHash2Bit(ti->x, ti->y) << 2 | GetHouseBuildingStage(ti->tile)];
    00216
    00217   if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
    00218
    00219   DrawGroundSprite(dcts->ground.sprite, dcts->ground.pal);
    00220
    00221   /* If houses are invisible, do not draw the upper part */
    00222   if (IsInvisibilitySet(TO_HOUSES)) return;
    00223
    00224   /* Add a house on top of the ground? */
    00225   SpriteID image = dcts->building.sprite;
    00226   if (image != 0) {
    00227     AddSortableSpriteToDraw(image, dcts->building.pal,
    00228       ti->x + dcts->subtile_x,
    00229       ti->y + dcts->subtile_y,
    00230       dcts->width,
    00231       dcts->height,
    00232       dcts->dz,
    00233       ti->z,
    00234       IsTransparencySet(TO_HOUSES)
    00235     );
    00236
    00237     if (IsTransparencySet(TO_HOUSES)) return;
    00238   }
    00239
    00240   {
    00241     int proc = dcts->draw_proc - 1;
    00242
    00243     if (proc >= 0) _town_draw_tile_procs[proc](ti);
    00244   }
    00245 }
    00246
    00247 static uint GetSlopeZ_Town(TileIndex tile, uint x, uint y)
    00248 {
    00249   return GetTileMaxZ(tile);
    00250 }
    00251
    00253 static Foundation GetFoundation_Town(TileIndex tile, Slope tileh)
    00254 {
    00255   HouseID hid = GetHouseType(tile);
    00256
    00257   /* For NewGRF house tiles we might not be drawing a foundation. We need to
    00258    * account for this, as other structures should
    00259    * draw the wall of the foundation in this case.
    00260    */
    00261   if (hid >= NEW_HOUSE_OFFSET) {
    00262     const HouseSpec *hs = HouseSpec::Get(hid);
    00263     if (hs->spritegroup != NULL && HasBit(hs->callback_mask, CBM_HOUSE_DRAW_FOUNDATIONS)) {
    00264       uint32 callback_res = GetHouseCallback(CBID_HOUSE_DRAW_FOUNDATIONS, 0, 0, hid, Town::GetByTile(tile), tile);
    00265       if (callback_res == 0) return FOUNDATION_NONE;
    00266     }
    00267   }
    00268   return FlatteningFoundation(tileh);
    00269 }
    00270
    00277 static void AnimateTile_Town(TileIndex tile)
    00278 {
    00279   if (GetHouseType(tile) >= NEW_HOUSE_OFFSET) {
    00280     AnimateNewHouseTile(tile);
    00281     return;
    00282   }
    00283
    00284   if (_tick_counter & 3) return;
    00285
    00286   /* If the house is not one with a lift anymore, then stop this animating.
    00287    * Not exactly sure when this happens, but probably when a house changes.
    00288    * Before this was just a return...so it'd leak animated tiles..
    00289    * That bug seems to have been here since day 1?? */
    00290   if (!(HouseSpec::Get(GetHouseType(tile))->building_flags & BUILDING_IS_ANIMATED)) {
    00291     DeleteAnimatedTile(tile);
    00292     return;
    00293   }
    00294
    00295   if (!LiftHasDestination(tile)) {
    00296     uint i;
    00297
    00298     /* Building has 6 floors, number 0 .. 6, where 1 is illegal.
    00299      * This is due to the fact that the first floor is, in the graphics,
    00300      *  the height of 2 'normal' floors.
    00301      * Furthermore, there are 6 lift positions from floor N (incl) to floor N + 1 (excl) */
    00302     do {
    00303       i = RandomRange(7);
    00304     } while (i == 1 || i * 6 == GetLiftPosition(tile));
    00305
    00306     SetLiftDestination(tile, i);
    00307   }
    00308
    00309   int pos = GetLiftPosition(tile);
    00310   int dest = GetLiftDestination(tile) * 6;
    00311   pos += (pos < dest) ? 1 : -1;
    00312   SetLiftPosition(tile, pos);
    00313
    00314   if (pos == dest) {
    00315     HaltLift(tile);
    00316     DeleteAnimatedTile(tile);
    00317   }
    00318
    00319   MarkTileDirtyByTile(tile);
    00320 }
    00321
    00328 static bool IsCloseToTown(TileIndex tile, uint dist)
    00329 {
    00330   const Town *t;
    00331
    00332   FOR_ALL_TOWNS(t) {
    00333     if (DistanceManhattan(tile, t->xy) < dist) return true;
    00334   }
    00335   return false;
    00336 }
    00337
    00342 void Town::UpdateVirtCoord()
    00343 {
    00344   Point pt = RemapCoords2(TileX(this->xy) * TILE_SIZE, TileY(this->xy) * TILE_SIZE);
    00345   SetDParam(0, this->index);
    00346   SetDParam(1, this->population);
    00347   this->sign.UpdatePosition(pt.x, pt.y - 24,
    00348     _settings_client.gui.population_in_label ? STR_VIEWPORT_TOWN_POP : STR_VIEWPORT_TOWN);
    00349
    00350   SetWindowDirty(WC_TOWN_VIEW, this->index);
    00351 }
    00352
    00354 void UpdateAllTownVirtCoords()
    00355 {
    00356   Town *t;
    00357
    00358   FOR_ALL_TOWNS(t) {
    00359     t->UpdateVirtCoord();
    00360   }
    00361 }
    00362
    00368 static void ChangePopulation(Town *t, int mod)
    00369 {
    00370   t->population += mod;
    00371   SetWindowDirty(WC_TOWN_VIEW, t->index);
    00372   t->UpdateVirtCoord();
    00373
    00374   InvalidateWindowData(WC_TOWN_DIRECTORY, 0, 1);
    00375 }
    00376
    00382 uint32 GetWorldPopulation()
    00383 {
    00384   uint32 pop = 0;
    00385   const Town *t;
    00386
    00387   FOR_ALL_TOWNS(t) pop += t->population;
    00388   return pop;
    00389 }
    00390
    00395 static void MakeSingleHouseBigger(TileIndex tile)
    00396 {
    00397   assert(IsTileType(tile, MP_HOUSE));
    00398
    00399   /* means it is completed, get out. */
    00400   if (LiftHasDestination(tile)) return;
    00401
    00402   /* progress in construction stages */
    00403   IncHouseConstructionTick(tile);
    00404   if (GetHouseConstructionTick(tile) != 0) return;
    00405
    00406   const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
    00407
    00408   /* Check and/or  */
    00409   if (HasBit(hs->callback_mask, CBM_HOUSE_CONSTRUCTION_STATE_CHANGE)) {
    00410     uint16 callback_res = GetHouseCallback(CBID_HOUSE_CONSTRUCTION_STATE_CHANGE, 0, 0, GetHouseType(tile), Town::GetByTile(tile), tile);
    00411     if (callback_res != CALLBACK_FAILED) ChangeHouseAnimationFrame(hs->grffile, tile, callback_res);
    00412   }
    00413
    00414   if (IsHouseCompleted(tile)) {
    00415     /* Now that construction is complete, we can add the population of the
    00416      * building to the town. */
    00417     ChangePopulation(Town::GetByTile(tile), hs->population);
    00418     ResetHouseAge(tile);
    00419   }
    00420   MarkTileDirtyByTile(tile);
    00421 }
    00422
    00426 static void MakeTownHouseBigger(TileIndex tile)
    00427 {
    00428   uint flags = HouseSpec::Get(GetHouseType(tile))->building_flags;
    00429   if (flags & BUILDING_HAS_1_TILE)  MakeSingleHouseBigger(TILE_ADDXY(tile, 0, 0));
    00430   if (flags & BUILDING_2_TILES_Y)   MakeSingleHouseBigger(TILE_ADDXY(tile, 0, 1));
    00431   if (flags & BUILDING_2_TILES_X)   MakeSingleHouseBigger(TILE_ADDXY(tile, 1, 0));
    00432   if (flags & BUILDING_HAS_4_TILES) MakeSingleHouseBigger(TILE_ADDXY(tile, 1, 1));
    00433 }
    00434
    00441 static void TileLoop_Town(TileIndex tile)
    00442 {
    00443   HouseID house_id = GetHouseType(tile);
    00444
    00445   /* NewHouseTileLoop returns false if Callback 21 succeeded, i.e. the house
    00446    * doesn't exist any more, so don't continue here. */
    00447   if (house_id >= NEW_HOUSE_OFFSET && !NewHouseTileLoop(tile)) return;
    00448
    00449   if (!IsHouseCompleted(tile)) {
    00450     /* Construction is not completed. See if we can go further in construction*/
    00451     MakeTownHouseBigger(tile);
    00452     return;
    00453   }
    00454
    00455   const HouseSpec *hs = HouseSpec::Get(house_id);
    00456
    00457   /* If the lift has a destination, it is already an animated tile. */
    00458   if ((hs->building_flags & BUILDING_IS_ANIMATED) &&
    00459       house_id < NEW_HOUSE_OFFSET &&
    00460       !LiftHasDestination(tile) &&
    00461       Chance16(1, 2)) {
    00462     AddAnimatedTile(tile);
    00463   }
    00464
    00465   Town *t = Town::GetByTile(tile);
    00466   uint32 r = Random();
    00467
    00468   StationFinder stations(tile, 1, 1);
    00469
    00470   if (HasBit(hs->callback_mask, CBM_HOUSE_PRODUCE_CARGO)) {
    00471     for (uint i = 0; i < 256; i++) {
    00472       uint16 callback = GetHouseCallback(CBID_HOUSE_PRODUCE_CARGO, i, r, house_id, t, tile);
    00473
    00474       if (callback == CALLBACK_FAILED || callback == CALLBACK_HOUSEPRODCARGO_END) break;
    00475
    00476       CargoID cargo = GetCargoTranslation(GB(callback, 8, 7), hs->grffile);
    00477       if (cargo == CT_INVALID) continue;
    00478
    00479       uint amt = GB(callback, 0, 8);
    00480       if (amt == 0) continue;
    00481
    00482       uint moved = MoveGoodsToStation(cargo, amt, ST_TOWN, t->index, stations.GetStations());
    00483
    00484       const CargoSpec *cs = CargoSpec::Get(cargo);
    00485       switch (cs->town_effect) {
    00486         case TE_PASSENGERS:
    00487           t->new_max_pass += amt;
    00488           t->new_act_pass += moved;
    00489           break;
    00490
    00491         case TE_MAIL:
    00492           t->new_max_mail += amt;
    00493           t->new_act_mail += moved;
    00494           break;
    00495
    00496         default:
    00497           break;
    00498       }
    00499     }
    00500   } else {
    00501     if (GB(r, 0, 8) < hs->population) {
    00502       uint amt = GB(r, 0, 8) / 8 + 1;
    00503
    00504       if (_economy.fluct <= 0) amt = (amt + 1) >> 1;
    00505       t->new_max_pass += amt;
    00506       t->new_act_pass += MoveGoodsToStation(CT_PASSENGERS, amt, ST_TOWN, t->index, stations.GetStations());
    00507     }
    00508
    00509     if (GB(r, 8, 8) < hs->mail_generation) {
    00510       uint amt = GB(r, 8, 8) / 8 + 1;
    00511
    00512       if (_economy.fluct <= 0) amt = (amt + 1) >> 1;
    00513       t->new_max_mail += amt;
    00514       t->new_act_mail += MoveGoodsToStation(CT_MAIL, amt, ST_TOWN, t->index, stations.GetStations());
    00515     }
    00516   }
    00517
    00518   _current_company = OWNER_TOWN;
    00519
    00520   if ((hs->building_flags & BUILDING_HAS_1_TILE) &&
    00521       HasBit(t->flags, TOWN_IS_FUNDED) &&
    00522       CanDeleteHouse(tile) &&
    00523       GetHouseAge(tile) >= hs->minimum_life &&
    00524       --t->time_until_rebuild == 0) {
    00525     t->time_until_rebuild = GB(r, 16, 8) + 192;
    00526
    00527     ClearTownHouse(t, tile);
    00528
    00529     /* Rebuild with another house? */
    00530     if (GB(r, 24, 8) >= 12) BuildTownHouse(t, tile);
    00531   }
    00532
    00533   _current_company = OWNER_NONE;
    00534 }
    00535
    00536 static CommandCost ClearTile_Town(TileIndex tile, DoCommandFlag flags)
    00537 {
    00538   if (flags & DC_AUTO) return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
    00539   if (!CanDeleteHouse(tile)) return CMD_ERROR;
    00540
    00541   const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
    00542
    00543   CommandCost cost(EXPENSES_CONSTRUCTION);
    00544   cost.AddCost(hs->GetRemovalCost());
    00545
    00546   int rating = hs->remove_rating_decrease;
    00547   _cleared_town_rating += rating;
    00548   Town *t = _cleared_town = Town::GetByTile(tile);
    00549
    00550   if (Company::IsValidID(_current_company)) {
    00551     if (rating > t->ratings[_current_company] && !(flags & DC_NO_TEST_TOWN_RATING) && !_cheats.magic_bulldozer.value) {
    00552       SetDParam(0, t->index);
    00553       return_cmd_error(STR_ERROR_LOCAL_AUTHORITY_REFUSES_TO_ALLOW_THIS);
    00554     }
    00555   }
    00556
    00557   ChangeTownRating(t, -rating, RATING_HOUSE_MINIMUM, flags);
    00558   if (flags & DC_EXEC) {
    00559     ClearTownHouse(t, tile);
    00560   }
    00561
    00562   return cost;
    00563 }
    00564
    00565 static void AddProducedCargo_Town(TileIndex tile, CargoArray &produced)
    00566 {
    00567   HouseID house_id = GetHouseType(tile);
    00568   const HouseSpec *hs = HouseSpec::Get(house_id);
    00569   Town *t = Town::GetByTile(tile);
    00570
    00571   if (HasBit(hs->callback_mask, CBM_HOUSE_PRODUCE_CARGO)) {
    00572     for (uint i = 0; i < 256; i++) {
    00573       uint16 callback = GetHouseCallback(CBID_HOUSE_PRODUCE_CARGO, i, 0, house_id, t, tile);
    00574
    00575       if (callback == CALLBACK_FAILED || callback == CALLBACK_HOUSEPRODCARGO_END) break;
    00576
    00577       CargoID cargo = GetCargoTranslation(GB(callback, 8, 7), hs->grffile);
    00578
    00579       if (cargo == CT_INVALID) continue;
    00580       produced[cargo]++;
    00581     }
    00582   } else {
    00583     if (hs->population > 0) {
    00584       produced[CT_PASSENGERS]++;
    00585     }
    00586     if (hs->mail_generation > 0) {
    00587       produced[CT_MAIL]++;
    00588     }
    00589   }
    00590 }
    00591
    00592 static inline void AddAcceptedCargoSetMask(CargoID cargo, uint amount, CargoArray &acceptance, uint32 *always_accepted)
    00593 {
    00594   if (cargo == CT_INVALID || amount == 0) return;
    00595   acceptance[cargo] += amount;
    00596   SetBit(*always_accepted, cargo);
    00597 }
    00598
    00599 static void AddAcceptedCargo_Town(TileIndex tile, CargoArray &acceptance, uint32 *always_accepted)
    00600 {
    00601   const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
    00602   CargoID accepts[3];
    00603
    00604   /* Set the initial accepted cargo types */
    00605   for (uint8 i = 0; i < lengthof(accepts); i++) {
    00606     accepts[i] = hs->accepts_cargo[i];
    00607   }
    00608
    00609   /* Check for custom accepted cargo types */
    00610   if (HasBit(hs->callback_mask, CBM_HOUSE_ACCEPT_CARGO)) {
    00611     uint16 callback = GetHouseCallback(CBID_HOUSE_ACCEPT_CARGO, 0, 0, GetHouseType(tile), Town::GetByTile(tile), tile);
    00612     if (callback != CALLBACK_FAILED) {
    00613       /* Replace accepted cargo types with translated values from callback */
    00614       accepts[0] = GetCargoTranslation(GB(callback,  0, 5), hs->grffile);
    00615       accepts[1] = GetCargoTranslation(GB(callback,  5, 5), hs->grffile);
    00616       accepts[2] = GetCargoTranslation(GB(callback, 10, 5), hs->grffile);
    00617     }
    00618   }
    00619
    00620   /* Check for custom cargo acceptance */
    00621   if (HasBit(hs->callback_mask, CBM_HOUSE_CARGO_ACCEPTANCE)) {
    00622     uint16 callback = GetHouseCallback(CBID_HOUSE_CARGO_ACCEPTANCE, 0, 0, GetHouseType(tile), Town::GetByTile(tile), tile);
    00623     if (callback != CALLBACK_FAILED) {
    00624       AddAcceptedCargoSetMask(accepts[0], GB(callback, 0, 4), acceptance, always_accepted);
    00625       AddAcceptedCargoSetMask(accepts[1], GB(callback, 4, 4), acceptance, always_accepted);
    00626       if (_settings_game.game_creation.landscape != LT_TEMPERATE && HasBit(callback, 12)) {
    00627         /* The 'S' bit indicates food instead of goods */
    00628         AddAcceptedCargoSetMask(CT_FOOD, GB(callback, 8, 4), acceptance, always_accepted);
    00629       } else {
    00630         AddAcceptedCargoSetMask(accepts[2], GB(callback, 8, 4), acceptance, always_accepted);
    00631       }
    00632       return;
    00633     }
    00634   }
    00635
    00636   /* No custom acceptance, so fill in with the default values */
    00637   for (uint8 i = 0; i < lengthof(accepts); i++) {
    00638     AddAcceptedCargoSetMask(accepts[i], hs->cargo_acceptance[i], acceptance, always_accepted);
    00639   }
    00640 }
    00641
    00642 static void GetTileDesc_Town(TileIndex tile, TileDesc *td)
    00643 {
    00644   const HouseID house = GetHouseType(tile);
    00645   const HouseSpec *hs = HouseSpec::Get(house);
    00646   bool house_completed = IsHouseCompleted(tile);
    00647
    00648   td->str = hs->building_name;
    00649
    00650   uint16 callback_res = GetHouseCallback(CBID_HOUSE_CUSTOM_NAME, house_completed ? 1 : 0, 0, house, Town::GetByTile(tile), tile);
    00651   if (callback_res != CALLBACK_FAILED) {
    00652     StringID new_name = GetGRFStringID(hs->grffile->grfid, 0xD000 + callback_res);
    00653     if (new_name != STR_NULL && new_name != STR_UNDEFINED) {
    00654       td->str = new_name;
    00655     }
    00656   }
    00657
    00658   if (!house_completed) {
    00659     SetDParamX(td->dparam, 0, td->str);
    00660     td->str = STR_LAI_TOWN_INDUSTRY_DESCRIPTION_UNDER_CONSTRUCTION;
    00661   }
    00662
    00663   if (hs->grffile != NULL) {
    00664     const GRFConfig *gc = GetGRFConfig(hs->grffile->grfid);
    00665     td->grf = gc->name;
    00666   }
    00667
    00668   td->owner[0] = OWNER_TOWN;
    00669 }
    00670
    00671 static TrackStatus GetTileTrackStatus_Town(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
    00672 {
    00673   /* not used */
    00674   return 0;
    00675 }
    00676
    00677 static void ChangeTileOwner_Town(TileIndex tile, Owner old_owner, Owner new_owner)
    00678 {
    00679   /* not used */
    00680 }
    00681
    00682 static bool GrowTown(Town *t);
    00683
    00684 static void TownTickHandler(Town *t)
    00685 {
    00686   if (HasBit(t->flags, TOWN_IS_FUNDED)) {
    00687     int i = t->grow_counter - 1;
    00688     if (i < 0) {
    00689       if (GrowTown(t)) {
    00690         i = t->growth_rate;
    00691       } else {
    00692         i = 0;
    00693       }
    00694     }
    00695     t->grow_counter = i;
    00696   }
    00697
    00698   UpdateTownRadius(t);
    00699 }
    00700
    00701 void OnTick_Town()
    00702 {
    00703   if (_game_mode == GM_EDITOR) return;
    00704
    00705   Town *t;
    00706   FOR_ALL_TOWNS(t) {
    00707     /* Run town tick at regular intervals, but not all at once. */
    00708     if ((_tick_counter + t->index) % TOWN_GROWTH_FREQUENCY == 0) {
    00709       TownTickHandler(t);
    00710     }
    00711   }
    00712 }
    00713
    00722 static RoadBits GetTownRoadBits(TileIndex tile)
    00723 {
    00724   if (IsRoadDepotTile(tile) || IsStandardRoadStopTile(tile)) return ROAD_NONE;
    00725
    00726   return GetAnyRoadBits(tile, ROADTYPE_ROAD, true);
    00727 }
    00728
    00739 static bool IsNeighborRoadTile(TileIndex tile, const DiagDirection dir, uint dist_multi)
    00740 {
    00741   if (!IsValidTile(tile)) return false;
    00742
    00743   /* Lookup table for the used diff values */
    00744   const TileIndexDiff tid_lt[3] = {
    00745     TileOffsByDiagDir(ChangeDiagDir(dir, DIAGDIRDIFF_90RIGHT)),
    00746     TileOffsByDiagDir(ChangeDiagDir(dir, DIAGDIRDIFF_90LEFT)),
    00747     TileOffsByDiagDir(ReverseDiagDir(dir)),
    00748   };
    00749
    00750   dist_multi = (dist_multi + 1) * 4;
    00751   for (uint pos = 4; pos < dist_multi; pos++) {
    00752     /* Go (pos / 4) tiles to the left or the right */
    00753     TileIndexDiff cur = tid_lt[(pos & 1) ? 0 : 1] * (pos / 4);
    00754
    00755     /* Use the current tile as origin, or go one tile backwards */
    00756     if (pos & 2) cur += tid_lt[2];
    00757
    00758     /* Test for roadbit parallel to dir and facing towards the middle axis */
    00759     if (IsValidTile(tile + cur) &&
    00760       GetTownRoadBits(TILE_ADD(tile, cur)) & DiagDirToRoadBits((pos & 2) ? dir : ReverseDiagDir(dir))) return true;
    00761   }
    00762   return false;
    00763 }
    00764
    00773 static bool IsRoadAllowedHere(Town *t, TileIndex tile, DiagDirection dir)
    00774 {
    00775   if (DistanceFromEdge(tile) == 0) return false;
    00776
    00777   Slope cur_slope, desired_slope;
    00778
    00779   for (;;) {
    00780     /* Check if there already is a road at this point? */
    00781     if (GetTownRoadBits(tile) == ROAD_NONE) {
    00782       /* No, try if we are able to build a road piece there.
    00783        * If that fails clear the land, and if that fails exit.
    00784        * This is to make sure that we can build a road here later. */
    00785       if (CmdFailed(DoCommand(tile, ((dir == DIAGDIR_NW || dir == DIAGDIR_SE) ? ROAD_X : ROAD_Y), 0, DC_AUTO, CMD_BUILD_ROAD)) &&
    00786           CmdFailed(DoCommand(tile, 0, 0, DC_AUTO, CMD_LANDSCAPE_CLEAR)))
    00787         return false;
    00788     }
    00789
    00790     cur_slope = _settings_game.construction.build_on_slopes ? GetFoundationSlope(tile, NULL) : GetTileSlope(tile, NULL);
    00791     bool ret = !IsNeighborRoadTile(tile, dir, t->layout == TL_ORIGINAL ? 1 : 2);
    00792     if (cur_slope == SLOPE_FLAT) return ret;
    00793
    00794     /* If the tile is not a slope in the right direction, then
    00795      * maybe terraform some. */
    00796     desired_slope = (dir == DIAGDIR_NW || dir == DIAGDIR_SE) ? SLOPE_NW : SLOPE_NE;
    00797     if (desired_slope != cur_slope && ComplementSlope(desired_slope) != cur_slope) {
    00798       if (Chance16(1, 8)) {
    00799         CommandCost res = CMD_ERROR;
    00800         if (!_generating_world && Chance16(1, 10)) {
    00801           /* Note: Do not replace "^ SLOPE_ELEVATED" with ComplementSlope(). The slope might be steep. */
    00802           res = DoCommand(tile, Chance16(1, 16) ? cur_slope : cur_slope ^ SLOPE_ELEVATED, 0,
    00803               DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_TERRAFORM_LAND);
    00804         }
    00805         if (CmdFailed(res) && Chance16(1, 3)) {
    00806           /* We can consider building on the slope, though. */
    00807           return ret;
    00808         }
    00809       }
    00810       return false;
    00811     }
    00812     return ret;
    00813   }
    00814 }
    00815
    00816 static bool TerraformTownTile(TileIndex tile, int edges, int dir)
    00817 {
    00818   assert(tile < MapSize());
    00819
    00820   CommandCost r = DoCommand(tile, edges, dir, DC_AUTO | DC_NO_WATER, CMD_TERRAFORM_LAND);
    00821   if (CmdFailed(r) || r.GetCost() >= (_price[PR_TERRAFORM] + 2) * 8) return false;
    00822   DoCommand(tile, edges, dir, DC_AUTO | DC_NO_WATER | DC_EXEC, CMD_TERRAFORM_LAND);
    00823   return true;
    00824 }
    00825
    00826 static void LevelTownLand(TileIndex tile)
    00827 {
    00828   assert(tile < MapSize());
    00829
    00830   /* Don't terraform if land is plain or if there's a house there. */
    00831   if (IsTileType(tile, MP_HOUSE)) return;
    00832   Slope tileh = GetTileSlope(tile, NULL);
    00833   if (tileh == SLOPE_FLAT) return;
    00834
    00835   /* First try up, then down */
    00836   if (!TerraformTownTile(tile, ~tileh & SLOPE_ELEVATED, 1)) {
    00837     TerraformTownTile(tile, tileh & SLOPE_ELEVATED, 0);
    00838   }
    00839 }
    00840
    00850 static RoadBits GetTownRoadGridElement(Town *t, TileIndex tile, DiagDirection dir)
    00851 {
    00852   /* align the grid to the downtown */
    00853   TileIndexDiffC grid_pos = TileIndexToTileIndexDiffC(t->xy, tile); // Vector from downtown to the tile
    00854   RoadBits rcmd = ROAD_NONE;
    00855
    00856   switch (t->layout) {
    00857     default: NOT_REACHED();
    00858
    00859     case TL_2X2_GRID:
    00860       if ((grid_pos.x % 3) == 0) rcmd |= ROAD_Y;
    00861       if ((grid_pos.y % 3) == 0) rcmd |= ROAD_X;
    00862       break;
    00863
    00864     case TL_3X3_GRID:
    00865       if ((grid_pos.x % 4) == 0) rcmd |= ROAD_Y;
    00866       if ((grid_pos.y % 4) == 0) rcmd |= ROAD_X;
    00867       break;
    00868   }
    00869
    00870   /* Optimise only X-junctions */
    00871   if (rcmd != ROAD_ALL) return rcmd;
    00872
    00873   RoadBits rb_template;
    00874
    00875   switch (GetTileSlope(tile, NULL)) {
    00876     default:       rb_template = ROAD_ALL; break;
    00877     case SLOPE_W:  rb_template = ROAD_NW | ROAD_SW; break;
    00878     case SLOPE_SW: rb_template = ROAD_Y  | ROAD_SW; break;
    00879     case SLOPE_S:  rb_template = ROAD_SW | ROAD_SE; break;
    00880     case SLOPE_SE: rb_template = ROAD_X  | ROAD_SE; break;
    00881     case SLOPE_E:  rb_template = ROAD_SE | ROAD_NE; break;
    00882     case SLOPE_NE: rb_template = ROAD_Y  | ROAD_NE; break;
    00883     case SLOPE_N:  rb_template = ROAD_NE | ROAD_NW; break;
    00884     case SLOPE_NW: rb_template = ROAD_X  | ROAD_NW; break;
    00885     case SLOPE_STEEP_W:
    00886     case SLOPE_STEEP_S:
    00887     case SLOPE_STEEP_E:
    00888     case SLOPE_STEEP_N:
    00889       rb_template = ROAD_NONE;
    00890       break;
    00891   }
    00892
    00893   /* Stop if the template is compatible to the growth dir */
    00894   if (DiagDirToRoadBits(ReverseDiagDir(dir)) & rb_template) return rb_template;
    00895   /* If not generate a straight road in the direction of the growth */
    00896   return DiagDirToRoadBits(dir) | DiagDirToRoadBits(ReverseDiagDir(dir));
    00897 }
    00898
    00909 static bool GrowTownWithExtraHouse(Town *t, TileIndex tile)
    00910 {
    00911   /* We can't look further than that. */
    00912   if (DistanceFromEdge(tile) == 0) return false;
    00913
    00914   uint counter = 0; // counts the house neighbor tiles
    00915
    00916   /* Check the tiles E,N,W and S of the current tile for houses */
    00917   for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
    00918     /* Count both void and house tiles for checking whether there
    00919      * are enough houses in the area. This to make it likely that
    00920      * houses get build up to the edge of the map. */
    00921     switch (GetTileType(TileAddByDiagDir(tile, dir))) {
    00922       case MP_HOUSE:
    00923       case MP_VOID:
    00924         counter++;
    00925         break;
    00926
    00927       default:
    00928         break;
    00929     }
    00930
    00931     /* If there are enough neighbors stop here */
    00932     if (counter >= 3) {
    00933       if (BuildTownHouse(t, tile)) {
    00934         _grow_town_result = GROWTH_SUCCEED;
    00935         return true;
    00936       }
    00937       return false;
    00938     }
    00939   }
    00940   return false;
    00941 }
    00942
    00951 static bool GrowTownWithRoad(const Town *t, TileIndex tile, RoadBits rcmd)
    00952 {
    00953   if (CmdSucceeded(DoCommand(tile, rcmd, t->index, DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_BUILD_ROAD))) {
    00954     _grow_town_result = GROWTH_SUCCEED;
    00955     return true;
    00956   }
    00957   return false;
    00958 }
    00959
    00970 static bool GrowTownWithBridge(const Town *t, const TileIndex tile, const DiagDirection bridge_dir)
    00971 {
    00972   assert(bridge_dir < DIAGDIR_END);
    00973
    00974   const Slope slope = GetTileSlope(tile, NULL);
    00975   if (slope == SLOPE_FLAT) return false; // no slope, no bridge
    00976
    00977   /* Make sure the direction is compatible with the slope.
    00978    * Well we check if the slope has an up bit set in the
    00979    * reverse direction. */
    00980   if (slope & InclinedSlope(bridge_dir)) return false;
    00981
    00982   /* Assure that the bridge is connectable to the start side */
    00983   if (!(GetTownRoadBits(TileAddByDiagDir(tile, ReverseDiagDir(bridge_dir))) & DiagDirToRoadBits(bridge_dir))) return false;
    00984
    00985   /* We are in the right direction */
    00986   uint8 bridge_length = 0;      // This value stores the length of the possible bridge
    00987   TileIndex bridge_tile = tile; // Used to store the other waterside
    00988
    00989   const int delta = TileOffsByDiagDir(bridge_dir);
    00990   do {
    00991     if (bridge_length++ >= 11) {
    00992       /* Max 11 tile long bridges */
    00993       return false;
    00994     }
    00995     bridge_tile += delta;
    00996   } while (TileX(bridge_tile) != 0 && TileY(bridge_tile) != 0 && IsWaterTile(bridge_tile));
    00997
    00998   /* no water tiles in between? */
    00999   if (bridge_length == 1) return false;
    01000
    01001   for (uint8 times = 0; times <= 22; times++) {
    01002     byte bridge_type = RandomRange(MAX_BRIDGES - 1);
    01003
    01004     /* Can we actually build the bridge? */
    01005     if (CmdSucceeded(DoCommand(tile, bridge_tile, bridge_type | ROADTYPES_ROAD << 8 | TRANSPORT_ROAD << 15, DC_AUTO, CMD_BUILD_BRIDGE))) {
    01006       DoCommand(tile, bridge_tile, bridge_type | ROADTYPES_ROAD << 8 | TRANSPORT_ROAD << 15, DC_EXEC | DC_AUTO, CMD_BUILD_BRIDGE);
    01007       _grow_town_result = GROWTH_SUCCEED;
    01008       return true;
    01009     }
    01010   }
    01011   /* Quit if it selecting an appropiate bridge type fails a large number of times. */
    01012   return false;
    01013 }
    01014
    01032 static void GrowTownInTile(TileIndex *tile_ptr, RoadBits cur_rb, DiagDirection target_dir, Town *t1)
    01033 {
    01034   RoadBits rcmd = ROAD_NONE;  // RoadBits for the road construction command
    01035   TileIndex tile = *tile_ptr; // The main tile on which we base our growth
    01036
    01037   assert(tile < MapSize());
    01038
    01039   if (cur_rb == ROAD_NONE) {
    01040     /* Tile has no road. First reset the status counter
    01041      * to say that this is the last iteration. */
    01042     _grow_town_result = GROWTH_SEARCH_STOPPED;
    01043
    01044     if (!_settings_game.economy.allow_town_roads && !_generating_world) return;
    01045
    01046     /* Remove hills etc */
    01047     if (!_settings_game.construction.build_on_slopes || Chance16(1, 6)) LevelTownLand(tile);
    01048
    01049     /* Is a road allowed here? */
    01050     switch (t1->layout) {
    01051       default: NOT_REACHED();
    01052
    01053       case TL_3X3_GRID:
    01054       case TL_2X2_GRID:
    01055         rcmd = GetTownRoadGridElement(t1, tile, target_dir);
    01056         if (rcmd == ROAD_NONE) return;
    01057         break;
    01058
    01059       case TL_BETTER_ROADS:
    01060       case TL_ORIGINAL:
    01061         if (!IsRoadAllowedHere(t1, tile, target_dir)) return;
    01062
    01063         DiagDirection source_dir = ReverseDiagDir(target_dir);
    01064
    01065         if (Chance16(1, 4)) {
    01066           /* Randomize a new target dir */
    01067           do target_dir = RandomDiagDir(); while (target_dir == source_dir);
    01068         }
    01069
    01070         if (!IsRoadAllowedHere(t1, TileAddByDiagDir(tile, target_dir), target_dir)) {
    01071           /* A road is not allowed to continue the randomized road,
    01072            *  return if the road we're trying to build is curved. */
    01073           if (target_dir != ReverseDiagDir(source_dir)) return;
    01074
    01075           /* Return if neither side of the new road is a house */
    01076           if (!IsTileType(TileAddByDiagDir(tile, ChangeDiagDir(target_dir, DIAGDIRDIFF_90RIGHT)), MP_HOUSE) &&
    01077               !IsTileType(TileAddByDiagDir(tile, ChangeDiagDir(target_dir, DIAGDIRDIFF_90LEFT)), MP_HOUSE)) {
    01078             return;
    01079           }
    01080
    01081           /* That means that the road is only allowed if there is a house
    01082            *  at any side of the new road. */
    01083         }
    01084
    01085         rcmd = DiagDirToRoadBits(target_dir) | DiagDirToRoadBits(source_dir);
    01086         break;
    01087     }
    01088
    01089   } else if (target_dir < DIAGDIR_END && !(cur_rb & DiagDirToRoadBits(ReverseDiagDir(target_dir)))) {
    01090     /* Continue building on a partial road.
    01091      * Should be allways OK, so we only generate
    01092      * the fitting RoadBits */
    01093     _grow_town_result = GROWTH_SEARCH_STOPPED;
    01094
    01095     if (!_settings_game.economy.allow_town_roads && !_generating_world) return;
    01096
    01097     switch (t1->layout) {
    01098       default: NOT_REACHED();
    01099
    01100       case TL_3X3_GRID:
    01101       case TL_2X2_GRID:
    01102         rcmd = GetTownRoadGridElement(t1, tile, target_dir);
    01103         break;
    01104
    01105       case TL_BETTER_ROADS:
    01106       case TL_ORIGINAL:
    01107         rcmd = DiagDirToRoadBits(ReverseDiagDir(target_dir));
    01108         break;
    01109     }
    01110   } else {
    01111     bool allow_house = true; // Value which decides if we want to construct a house
    01112
    01113     /* Reached a tunnel/bridge? Then continue at the other side of it. */
    01114     if (IsTileType(tile, MP_TUNNELBRIDGE)) {
    01115       if (GetTunnelBridgeTransportType(tile) == TRANSPORT_ROAD) {
    01116         *tile_ptr = GetOtherTunnelBridgeEnd(tile);
    01117       }
    01118       return;
    01119     }
    01120
    01121     /* Possibly extend the road in a direction.
    01122      * Randomize a direction and if it has a road, bail out. */
    01123     target_dir = RandomDiagDir();
    01124     if (cur_rb & DiagDirToRoadBits(target_dir)) return;
    01125
    01126     /* This is the tile we will reach if we extend to this direction. */
    01127     TileIndex house_tile = TileAddByDiagDir(tile, target_dir); // position of a possible house
    01128
    01129     /* Don't walk into water. */
    01130     if (IsWaterTile(house_tile)) return;
    01131
    01132     if (!IsValidTile(house_tile)) return;
    01133
    01134     if (_settings_game.economy.allow_town_roads || _generating_world) {
    01135       switch (t1->layout) {
    01136         default: NOT_REACHED();
    01137
    01138         case TL_3X3_GRID: // Use 2x2 grid afterwards!
    01139           GrowTownWithExtraHouse(t1, TileAddByDiagDir(house_tile, target_dir));
    01140           /* FALL THROUGH */
    01141
    01142         case TL_2X2_GRID:
    01143           rcmd = GetTownRoadGridElement(t1, house_tile, target_dir);
    01144           allow_house = (rcmd == ROAD_NONE);
    01145           break;
    01146
    01147         case TL_BETTER_ROADS: // Use original afterwards!
    01148           GrowTownWithExtraHouse(t1, TileAddByDiagDir(house_tile, target_dir));
    01149           /* FALL THROUGH */
    01150
    01151         case TL_ORIGINAL:
    01152           /* Allow a house at the edge. 60% chance or
    01153            * always ok if no road allowed. */
    01154           rcmd = DiagDirToRoadBits(target_dir);
    01155           allow_house = (!IsRoadAllowedHere(t1, house_tile, target_dir) || Chance16(6, 10));
    01156           break;
    01157       }
    01158     }
    01159
    01160     if (allow_house) {
    01161       /* Build a house, but not if there already is a house there. */
    01162       if (!IsTileType(house_tile, MP_HOUSE)) {
    01163         /* Level the land if possible */
    01164         if (Chance16(1, 6)) LevelTownLand(house_tile);
    01165
    01166         /* And build a house.
    01167          * Set result to -1 if we managed to build it. */
    01168         if (BuildTownHouse(t1, house_tile)) {
    01169           _grow_town_result = GROWTH_SUCCEED;
    01170         }
    01171       }
    01172       return;
    01173     }
    01174
    01175     _grow_town_result = GROWTH_SEARCH_STOPPED;
    01176   }
    01177
    01178   /* Return if a water tile */
    01179   if (IsWaterTile(tile)) return;
    01180
    01181   /* Make the roads look nicer */
    01182   rcmd = CleanUpRoadBits(tile, rcmd);
    01183   if (rcmd == ROAD_NONE) return;
    01184
    01185   /* Only use the target direction for bridges to ensure they're connected.
    01186    * The target_dir is as computed previously according to town layout, so
    01187    * it will match it perfectly. */
    01188   if (GrowTownWithBridge(t1, tile, target_dir)) return;
    01189
    01190   GrowTownWithRoad(t1, tile, rcmd);
    01191 }
    01192
    01198 static int GrowTownAtRoad(Town *t, TileIndex tile)
    01199 {
    01200   /* Special case.
    01201    * @see GrowTownInTile Check the else if
    01202    */
    01203   DiagDirection target_dir = DIAGDIR_END; // The direction in which we want to extend the town
    01204
    01205   assert(tile < MapSize());
    01206
    01207   /* Number of times to search.
    01208    * Better roads, 2X2 and 3X3 grid grow quite fast so we give
    01209    * them a little handicap. */
    01210   switch (t->layout) {
    01211     case TL_BETTER_ROADS:
    01212       _grow_town_result = 10 + t->num_houses * 2 / 9;
    01213       break;
    01214
    01215     case TL_3X3_GRID:
    01216     case TL_2X2_GRID:
    01217       _grow_town_result = 10 + t->num_houses * 1 / 9;
    01218       break;
    01219
    01220     default:
    01221       _grow_town_result = 10 + t->num_houses * 4 / 9;
    01222       break;
    01223   }
    01224
    01225   do {
    01226     RoadBits cur_rb = GetTownRoadBits(tile); // The RoadBits of the current tile
    01227
    01228     /* Try to grow the town from this point */
    01229     GrowTownInTile(&tile, cur_rb, target_dir, t);
    01230
    01231     /* Exclude the source position from the bitmask
    01232      * and return if no more road blocks available */
    01233     cur_rb &= ~DiagDirToRoadBits(ReverseDiagDir(target_dir));
    01234     if (cur_rb == ROAD_NONE)
    01235       return _grow_town_result;
    01236
    01237     /* Select a random bit from the blockmask, walk a step
    01238      * and continue the search from there. */
    01239     do target_dir = RandomDiagDir(); while (!(cur_rb & DiagDirToRoadBits(target_dir)));
    01240     tile = TileAddByDiagDir(tile, target_dir);
    01241
    01242     if (IsTileType(tile, MP_ROAD) && !IsRoadDepot(tile) && HasTileRoadType(tile, ROADTYPE_ROAD)) {
    01243       /* Don't allow building over roads of other cities */
    01244       if (IsRoadOwner(tile, ROADTYPE_ROAD, OWNER_TOWN) && Town::GetByTile(tile) != t) {
    01245         _grow_town_result = GROWTH_SUCCEED;
    01246       } else if (IsRoadOwner(tile, ROADTYPE_ROAD, OWNER_NONE) && _game_mode == GM_EDITOR) {
    01247         /* If we are in the SE, and this road-piece has no town owner yet, it just found an
    01248          * owner :) (happy happy happy road now) */
    01249         SetRoadOwner(tile, ROADTYPE_ROAD, OWNER_TOWN);
    01250         SetTownIndex(tile, t->index);
    01251       }
    01252     }
    01253
    01254     /* Max number of times is checked. */
    01255   } while (--_grow_town_result >= 0);
    01256
    01257   return (_grow_town_result == -2);
    01258 }
    01259
    01267 static RoadBits GenRandomRoadBits()
    01268 {
    01269   uint32 r = Random();
    01270   uint a = GB(r, 0, 2);
    01271   uint b = GB(r, 8, 2);
    01272   if (a == b) b ^= 2;
    01273   return (RoadBits)((ROAD_NW << a) + (ROAD_NW << b));
    01274 }
    01275
    01280 static bool GrowTown(Town *t)
    01281 {
    01282   static const TileIndexDiffC _town_coord_mod[] = {
    01283     {-1,  0},
    01284     { 1,  1},
    01285     { 1, -1},
    01286     {-1, -1},
    01287     {-1,  0},
    01288     { 0,  2},
    01289     { 2,  0},
    01290     { 0, -2},
    01291     {-1, -1},
    01292     {-2,  2},
    01293     { 2,  2},
    01294     { 2, -2},
    01295     { 0,  0}
    01296   };
    01297
    01298   /* Current "company" is a town */
    01299   CompanyID old_company = _current_company;
    01300   _current_company = OWNER_TOWN;
    01301
    01302   TileIndex tile = t->xy; // The tile we are working with ATM
    01303
    01304   /* Find a road that we can base the construction on. */
    01305   const TileIndexDiffC *ptr;
    01306   for (ptr = _town_coord_mod; ptr != endof(_town_coord_mod); ++ptr) {
    01307     if (GetTownRoadBits(tile) != ROAD_NONE) {
    01308       int r = GrowTownAtRoad(t, tile);
    01309       _current_company = old_company;
    01310       return r != 0;
    01311     }
    01312     tile = TILE_ADD(tile, ToTileIndexDiff(*ptr));
    01313   }
    01314
    01315   /* No road available, try to build a random road block by
    01316    * clearing some land and then building a road there. */
    01317   if (_settings_game.economy.allow_town_roads || _generating_world) {
    01318     tile = t->xy;
    01319     for (ptr = _town_coord_mod; ptr != endof(_town_coord_mod); ++ptr) {
    01320       /* Only work with plain land that not already has a house */
    01321       if (!IsTileType(tile, MP_HOUSE) && GetTileSlope(tile, NULL) == SLOPE_FLAT) {
    01322         if (CmdSucceeded(DoCommand(tile, 0, 0, DC_AUTO | DC_NO_WATER, CMD_LANDSCAPE_CLEAR))) {
    01323           DoCommand(tile, GenRandomRoadBits(), t->index, DC_EXEC | DC_AUTO, CMD_BUILD_ROAD);
    01324           _current_company = old_company;
    01325           return true;
    01326         }
    01327       }
    01328       tile = TILE_ADD(tile, ToTileIndexDiff(*ptr));
    01329     }
    01330   }
    01331
    01332   _current_company = old_company;
    01333   return false;
    01334 }
    01335
    01336 void UpdateTownRadius(Town *t)
    01337 {
    01338   static const uint32 _town_squared_town_zone_radius_data[23][5] = {
    01339     {  4,  0,  0,  0,  0}, // 0
    01340     { 16,  0,  0,  0,  0},
    01341     { 25,  0,  0,  0,  0},
    01342     { 36,  0,  0,  0,  0},
    01343     { 49,  0,  4,  0,  0},
    01344     { 64,  0,  4,  0,  0}, // 20
    01345     { 64,  0,  9,  0,  1},
    01346     { 64,  0,  9,  0,  4},
    01347     { 64,  0, 16,  0,  4},
    01348     { 81,  0, 16,  0,  4},
    01349     { 81,  0, 16,  0,  4}, // 40
    01350     { 81,  0, 25,  0,  9},
    01351     { 81, 36, 25,  0,  9},
    01352     { 81, 36, 25, 16,  9},
    01353     { 81, 49,  0, 25,  9},
    01354     { 81, 64,  0, 25,  9}, // 60
    01355     { 81, 64,  0, 36,  9},
    01356     { 81, 64,  0, 36, 16},
    01357     {100, 81,  0, 49, 16},
    01358     {100, 81,  0, 49, 25},
    01359     {121, 81,  0, 49, 25}, // 80
    01360     {121, 81,  0, 49, 25},
    01361     {121, 81,  0, 49, 36}, // 88
    01362   };
    01363
    01364   if (t->num_houses < 92) {
    01365     memcpy(t->squared_town_zone_radius, _town_squared_town_zone_radius_data[t->num_houses / 4], sizeof(t->squared_town_zone_radius));
    01366   } else {
    01367     int mass = t->num_houses / 8;
    01368     /* Actually we are proportional to sqrt() but that's right because we are covering an area.
    01369      * The offsets are to make sure the radii do not decrease in size when going from the table
    01370      * to the calculated value.*/
    01371     t->squared_town_zone_radius[0] = mass * 15 - 40;
    01372     t->squared_town_zone_radius[1] = mass * 9 - 15;
    01373     t->squared_town_zone_radius[2] = 0;
    01374     t->squared_town_zone_radius[3] = mass * 5 - 5;
    01375     t->squared_town_zone_radius[4] = mass * 3 + 5;
    01376   }
    01377 }
    01378
    01379 void UpdateTownMaxPass(Town *t)
    01380 {
    01381   t->max_pass = t->population >> 3;
    01382   t->max_mail = t->population >> 4;
    01383 }
    01384
    01396 static void DoCreateTown(Town *t, TileIndex tile, uint32 townnameparts, TownSize size, bool city, TownLayout layout, bool manual)
    01397 {
    01398   t->xy = tile;
    01399   t->num_houses = 0;
    01400   t->time_until_rebuild = 10;
    01401   UpdateTownRadius(t);
    01402   t->flags = 0;
    01403   t->population = 0;
    01404   t->grow_counter = 0;
    01405   t->growth_rate = 250;
    01406   t->new_max_pass = 0;
    01407   t->new_max_mail = 0;
    01408   t->new_act_pass = 0;
    01409   t->new_act_mail = 0;
    01410   t->max_pass = 0;
    01411   t->max_mail = 0;
    01412   t->act_pass = 0;
    01413   t->act_mail = 0;
    01414
    01415   t->pct_pass_transported = 0;
    01416   t->pct_mail_transported = 0;
    01417   t->fund_buildings_months = 0;
    01418   t->new_act_food = 0;
    01419   t->new_act_water = 0;
    01420   t->act_food = 0;
    01421   t->act_water = 0;
    01422
    01423   for (uint i = 0; i != MAX_COMPANIES; i++) t->ratings[i] = RATING_INITIAL;
    01424
    01425   t->have_ratings = 0;
    01426   t->exclusivity = INVALID_COMPANY;
    01427   t->exclusive_counter = 0;
    01428   t->statues = 0;
    01429
    01430   extern int _nb_orig_names;
    01431   if (_settings_game.game_creation.town_name < _nb_orig_names) {
    01432     /* Original town name */
    01433     t->townnamegrfid = 0;
    01434     t->townnametype = SPECSTR_TOWNNAME_START + _settings_game.game_creation.town_name;
    01435   } else {
    01436     /* Newgrf town name */
    01437     t->townnamegrfid = GetGRFTownNameId(_settings_game.game_creation.town_name  - _nb_orig_names);
    01438     t->townnametype  = GetGRFTownNameType(_settings_game.game_creation.town_name - _nb_orig_names);
    01439   }
    01440   t->townnameparts = townnameparts;
    01441
    01442   t->UpdateVirtCoord();
    01443   InvalidateWindowData(WC_TOWN_DIRECTORY, 0, 0);
    01444
    01445   t->InitializeLayout(layout);
    01446
    01447   t->larger_town = city;
    01448
    01449   int x = (int)size * 16 + 3;
    01450   if (size == TS_RANDOM) x = (Random() & 0xF) + 8;
    01451   /* Don't create huge cities when founding town in-game */
    01452   if (city && (!manual || _game_mode == GM_EDITOR)) x *= _settings_game.economy.initial_city_size;
    01453
    01454   t->num_houses += x;
    01455   UpdateTownRadius(t);
    01456
    01457   int i = x * 4;
    01458   do {
    01459     GrowTown(t);
    01460   } while (--i);
    01461
    01462   t->num_houses -= x;
    01463   UpdateTownRadius(t);
    01464   UpdateTownMaxPass(t);
    01465   UpdateAirportsNoise();
    01466 }
    01467
    01473 static CommandCost TownCanBePlacedHere(TileIndex tile)
    01474 {
    01475   /* Check if too close to the edge of map */
    01476   if (DistanceFromEdge(tile) < 12) {
    01477     return_cmd_error(STR_ERROR_TOO_CLOSE_TO_EDGE_OF_MAP_SUB);
    01478   }
    01479
    01480   /* Check distance to all other towns. */
    01481   if (IsCloseToTown(tile, 20)) {
    01482     return_cmd_error(STR_ERROR_TOO_CLOSE_TO_ANOTHER_TOWN);
    01483   }
    01484
    01485   /* Can only build on clear flat areas, possibly with trees. */
    01486   if ((!IsTileType(tile, MP_CLEAR) && !IsTileType(tile, MP_TREES)) || GetTileSlope(tile, NULL) != SLOPE_FLAT) {
    01487     return_cmd_error(STR_ERROR_SITE_UNSUITABLE);
    01488   }
    01489
    01490   return CommandCost(EXPENSES_OTHER);
    01491 }
    01492
    01498 static bool IsUniqueTownName(const char *name)
    01499 {
    01500   const Town *t;
    01501
    01502   FOR_ALL_TOWNS(t) {
    01503     if (t->name != NULL && strcmp(t->name, name) == 0) return false;
    01504   }
    01505
    01506   return true;
    01507 }
    01508
    01521 CommandCost CmdFoundTown(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01522 {
    01523   TownSize size = (TownSize)GB(p1, 0, 2);
    01524   bool city = HasBit(p1, 2);
    01525   TownLayout layout = (TownLayout)GB(p1, 3, 3);
    01526   TownNameParams par(_settings_game.game_creation.town_name);
    01527   bool random = HasBit(p1, 6);
    01528   uint32 townnameparts = p2;
    01529
    01530   if (size > TS_RANDOM) return CMD_ERROR;
    01531   if (layout > TL_RANDOM) return CMD_ERROR;
    01532
    01533   /* Some things are allowed only in the scenario editor */
    01534   if (_game_mode != GM_EDITOR) {
    01535     if (_settings_game.economy.found_town == TF_FORBIDDEN) return CMD_ERROR;
    01536     if (size == TS_LARGE) return CMD_ERROR;
    01537     if (random) return CMD_ERROR;
    01538     if (_settings_game.economy.found_town != TF_CUSTOM_LAYOUT && layout != _settings_game.economy.town_layout) {
    01539       return CMD_ERROR;
    01540     }
    01541   }
    01542
    01543   if (StrEmpty(text)) {
    01544     /* If supplied name is empty, townnameparts has to generate unique automatic name */
    01545     if (!VerifyTownName(townnameparts, &par)) return_cmd_error(STR_ERROR_NAME_MUST_BE_UNIQUE);
    01546   } else {
    01547     /* If name is not empty, it has to be unique custom name */
    01548     if (strlen(text) >= MAX_LENGTH_TOWN_NAME_BYTES) return CMD_ERROR;
    01549     if (!IsUniqueTownName(text)) return_cmd_error(STR_ERROR_NAME_MUST_BE_UNIQUE);
    01550   }
    01551
    01552   /* Allocate town struct */
    01553   if (!Town::CanAllocateItem()) return_cmd_error(STR_ERROR_TOO_MANY_TOWNS);
    01554
    01555   if (!random) {
    01556     CommandCost ret = TownCanBePlacedHere(tile);
    01557     if (CmdFailed(ret)) return ret;
    01558   }
    01559
    01560   static const byte price_mult[][TS_RANDOM + 1] = {{ 15, 25, 40, 25 }, { 20, 35, 55, 35 }};
    01561   /* multidimensional arrays have to have defined length of non-first dimension */
    01562   assert_compile(lengthof(price_mult[0]) == 4);
    01563
    01564   CommandCost cost(EXPENSES_OTHER, _price[PR_BUILD_TOWN]);
    01565   byte mult = price_mult[city][size];
    01566
    01567   cost.MultiplyCost(mult);
    01568
    01569   /* Create the town */
    01570   if (flags & DC_EXEC) {
    01571     if (cost.GetCost() > GetAvailableMoneyForCommand()) {
    01572       _additional_cash_required = cost.GetCost();
    01573       return CommandCost(EXPENSES_OTHER);
    01574     }
    01575
    01576     _generating_world = true;
    01577     UpdateNearestTownForRoadTiles(true);
    01578     Town *t;
    01579     if (random) {
    01580       t = CreateRandomTown(20, townnameparts, size, city, layout);
    01581       if (t == NULL) {
    01582         cost = CommandCost(STR_ERROR_NO_SPACE_FOR_TOWN);
    01583       } else {
    01584         _new_town_id = t->index;
    01585       }
    01586     } else {
    01587       t = new Town(tile);
    01588       DoCreateTown(t, tile, townnameparts, size, city, layout, true);
    01589     }
    01590     UpdateNearestTownForRoadTiles(false);
    01591     _generating_world = false;
    01592
    01593     if (t != NULL && !StrEmpty(text)) {
    01594       t->name = strdup(text);
    01595       t->UpdateVirtCoord();
    01596     }
    01597
    01598     if (_game_mode != GM_EDITOR) {
    01599       /* 't' can't be NULL since 'random' is false outside scenedit */
    01600       assert(!random);
    01601       char company_name[MAX_LENGTH_COMPANY_NAME_BYTES];
    01602       SetDParam(0, _current_company);
    01603       GetString(company_name, STR_COMPANY_NAME, lastof(company_name));
    01604
    01605       char *cn = strdup(company_name);
    01606       SetDParamStr(0, cn);
    01607       SetDParam(1, t->index);
    01608
    01609       AddNewsItem(STR_NEWS_NEW_TOWN, NS_INDUSTRY_OPEN, NR_TILE, tile, NR_NONE, UINT32_MAX, cn);
    01610     }
    01611   }
    01612   return cost;
    01613 }
    01614
    01624 static TileIndex AlignTileToGrid(TileIndex tile, TownLayout layout)
    01625 {
    01626   switch (layout) {
    01627     case TL_2X2_GRID: return TileXY(TileX(tile) - TileX(tile) % 3, TileY(tile) - TileY(tile) % 3);
    01628     case TL_3X3_GRID: return TileXY(TileX(tile) & ~3, TileY(tile) & ~3);
    01629     default:          return tile;
    01630   }
    01631 }
    01632
    01642 static bool IsTileAlignedToGrid(TileIndex tile, TownLayout layout)
    01643 {
    01644   switch (layout) {
    01645     case TL_2X2_GRID: return TileX(tile) % 3 == 0 && TileY(tile) % 3 == 0;
    01646     case TL_3X3_GRID: return TileX(tile) % 4 == 0 && TileY(tile) % 4 == 0;
    01647     default:          return true;
    01648   }
    01649 }
    01650
    01654 struct SpotData {
    01655   TileIndex tile;
    01656   uint max_dist;
    01657   TownLayout layout;
    01658 };
    01659
    01676 static bool FindFurthestFromWater(TileIndex tile, void *user_data)
    01677 {
    01678   SpotData *sp = (SpotData*)user_data;
    01679   uint dist = GetClosestWaterDistance(tile, true);
    01680
    01681   if (IsTileType(tile, MP_CLEAR) &&
    01682       GetTileSlope(tile, NULL) == SLOPE_FLAT &&
    01683       IsTileAlignedToGrid(tile, sp->layout) &&
    01684       dist > sp->max_dist) {
    01685     sp->tile = tile;
    01686     sp->max_dist = dist;
    01687   }
    01688
    01689   return false;
    01690 }
    01691
    01698 static bool FindNearestEmptyLand(TileIndex tile, void *user_data)
    01699 {
    01700   return IsTileType(tile, MP_CLEAR);
    01701 }
    01702
    01715 static TileIndex FindNearestGoodCoastalTownSpot(TileIndex tile, TownLayout layout)
    01716 {
    01717   SpotData sp = { INVALID_TILE, 0, layout };
    01718
    01719   TileIndex coast = tile;
    01720   if (CircularTileSearch(&coast, 40, FindNearestEmptyLand, NULL)) {
    01721     CircularTileSearch(&coast, 10, FindFurthestFromWater, &sp);
    01722     return sp.tile;
    01723   }
    01724
    01725   /* if we get here just give up */
    01726   return INVALID_TILE;
    01727 }
    01728
    01729 static Town *CreateRandomTown(uint attempts, uint32 townnameparts, TownSize size, bool city, TownLayout layout)
    01730 {
    01731   if (!Town::CanAllocateItem()) return NULL;
    01732
    01733   do {
    01734     /* Generate a tile index not too close from the edge */
    01735     TileIndex tile = AlignTileToGrid(RandomTile(), layout);
    01736
    01737     /* if we tried to place the town on water, slide it over onto
    01738      * the nearest likely-looking spot */
    01739     if (IsTileType(tile, MP_WATER)) {
    01740       tile = FindNearestGoodCoastalTownSpot(tile, layout);
    01741       if (tile == INVALID_TILE) continue;
    01742     }
    01743
    01744     /* Make sure town can be placed here */
    01745     if (CmdFailed(TownCanBePlacedHere(tile))) continue;
    01746
    01747     /* Allocate a town struct */
    01748     Town *t = new Town(tile);
    01749
    01750     DoCreateTown(t, tile, townnameparts, size, city, layout, false);
    01751
    01752     /* if the population is still 0 at the point, then the
    01753      * placement is so bad it couldn't grow at all */
    01754     if (t->population > 0) return t;
    01755     delete t;
    01756   } while (--attempts != 0);
    01757
    01758   return NULL;
    01759 }
    01760
    01761 static const byte _num_initial_towns[4] = {5, 11, 23, 46};  // very low, low, normal, high
    01762
    01769 bool GenerateTowns(TownLayout layout)
    01770 {
    01771   uint num = 0;
    01772   uint difficulty = _settings_game.difficulty.number_towns;
    01773   uint n = (difficulty == (uint)CUSTOM_TOWN_NUMBER_DIFFICULTY) ? _settings_game.game_creation.custom_town_number : ScaleByMapSize(_num_initial_towns[difficulty] + (Random() & 7));
    01774   uint32 townnameparts;
    01775
    01776   SetGeneratingWorldProgress(GWP_TOWN, n);
    01777
    01778   /* First attempt will be made at creating the suggested number of towns.
    01779    * Note that this is really a suggested value, not a required one.
    01780    * We would not like the system to lock up just because the user wanted 100 cities on a 64*64 map, would we? */
    01781   do {
    01782     bool city = (_settings_game.economy.larger_towns != 0 && Chance16(1, _settings_game.economy.larger_towns));
    01783     IncreaseGeneratingWorldProgress(GWP_TOWN);
    01784     /* Get a unique name for the town. */
    01785     if (!GenerateTownName(&townnameparts)) continue;
    01786     /* try 20 times to create a random-sized town for the first loop. */
    01787     if (CreateRandomTown(20, townnameparts, TS_RANDOM, city, layout) != NULL) num++; // if creation successfull, raise a flag
    01788   } while (--n);
    01789
    01790   if (num != 0) return true;
    01791
    01792   /* If num is still zero at this point, it means that not a single town has been created.
    01793    * So give it a last try, but now more aggressive */
    01794   if (GenerateTownName(&townnameparts) &&
    01795       CreateRandomTown(10000, townnameparts, TS_RANDOM, _settings_game.economy.larger_towns != 0, layout) != NULL) {
    01796     return true;
    01797   }
    01798
    01799   /* If there are no towns at all and we are generating new game, bail out */
    01800   if (Town::GetNumItems() == 0 && _game_mode != GM_EDITOR) {
    01801     extern StringID _switch_mode_errorstr;
    01802     _switch_mode_errorstr = STR_ERROR_COULD_NOT_CREATE_TOWN;
    01803   }
    01804
    01805   return false;  // we are still without a town? we failed, simply
    01806 }
    01807
    01808
    01814 HouseZonesBits GetTownRadiusGroup(const Town *t, TileIndex tile)
    01815 {
    01816   uint dist = DistanceSquare(tile, t->xy);
    01817
    01818   if (t->fund_buildings_months && dist <= 25) return HZB_TOWN_CENTRE;
    01819
    01820   HouseZonesBits smallest = HZB_TOWN_EDGE;
    01821   for (HouseZonesBits i = HZB_BEGIN; i < HZB_END; i++) {
    01822     if (dist < t->squared_town_zone_radius[i]) smallest = i;
    01823   }
    01824
    01825   return smallest;
    01826 }
    01827
    01838 static inline void ClearMakeHouseTile(TileIndex tile, Town *t, byte counter, byte stage, HouseID type, byte random_bits)
    01839 {
    01840   CommandCost cc = DoCommand(tile, 0, 0, DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_LANDSCAPE_CLEAR);
    01841
    01842   assert(CmdSucceeded(cc));
    01843
    01844   IncreaseBuildingCount(t, type);
    01845   MakeHouseTile(tile, t->index, counter, stage, type, random_bits);
    01846   if (HouseSpec::Get(type)->building_flags & BUILDING_IS_ANIMATED) AddAnimatedTile(tile);
    01847
    01848   MarkTileDirtyByTile(tile);
    01849 }
    01850
    01851
    01862 static void MakeTownHouse(TileIndex t, Town *town, byte counter, byte stage, HouseID type, byte random_bits)
    01863 {
    01864   BuildingFlags size = HouseSpec::Get(type)->building_flags;
    01865
    01866   ClearMakeHouseTile(t, town, counter, stage, type, random_bits);
    01867   if (size & BUILDING_2_TILES_Y)   ClearMakeHouseTile(t + TileDiffXY(0, 1), town, counter, stage, ++type, random_bits);
    01868   if (size & BUILDING_2_TILES_X)   ClearMakeHouseTile(t + TileDiffXY(1, 0), town, counter, stage, ++type, random_bits);
    01869   if (size & BUILDING_HAS_4_TILES) ClearMakeHouseTile(t + TileDiffXY(1, 1), town, counter, stage, ++type, random_bits);
    01870 }
    01871
    01872
    01881 static inline bool CanBuildHouseHere(TileIndex tile, TownID town, bool noslope)
    01882 {
    01883   /* cannot build on these slopes... */
    01884   Slope slope = GetTileSlope(tile, NULL);
    01885   if ((noslope && slope != SLOPE_FLAT) || IsSteepSlope(slope)) return false;
    01886
    01887   /* building under a bridge? */
    01888   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return false;
    01889
    01890   /* do not try to build over house owned by another town */
    01891   if (IsTileType(tile, MP_HOUSE) && GetTownIndex(tile) != town) return false;
    01892
    01893   /* can we clear the land? */
    01894   return CmdSucceeded(DoCommand(tile, 0, 0, DC_AUTO | DC_NO_WATER, CMD_LANDSCAPE_CLEAR));
    01895 }
    01896
    01897
    01907 static inline bool CheckBuildHouseSameZ(TileIndex tile, TownID town, uint z, bool noslope)
    01908 {
    01909   if (!CanBuildHouseHere(tile, town, noslope)) return false;
    01910
    01911   /* if building on slopes is allowed, there will be flattening foundation (to tile max z) */
    01912   if (GetTileMaxZ(tile) != z) return false;
    01913
    01914   return true;
    01915 }
    01916
    01917
    01927 static bool CheckFree2x2Area(TileIndex tile, TownID town, uint z, bool noslope)
    01928 {
    01929   /* we need to check this tile too because we can be at different tile now */
    01930   if (!CheckBuildHouseSameZ(tile, town, z, noslope)) return false;
    01931
    01932   for (DiagDirection d = DIAGDIR_SE; d < DIAGDIR_END; d++) {
    01933     tile += TileOffsByDiagDir(d);
    01934     if (!CheckBuildHouseSameZ(tile, town, z, noslope)) return false;
    01935   }
    01936
    01937   return true;
    01938 }
    01939
    01940
    01948 static inline bool TownLayoutAllowsHouseHere(Town *t, TileIndex tile)
    01949 {
    01950   /* Allow towns everywhere when we don't build roads */
    01951   if (!_settings_game.economy.allow_town_roads && !_generating_world) return true;
    01952
    01953   TileIndexDiffC grid_pos = TileIndexToTileIndexDiffC(t->xy, tile);
    01954
    01955   switch (t->layout) {
    01956     case TL_2X2_GRID:
    01957       if ((grid_pos.x % 3) == 0 || (grid_pos.y % 3) == 0) return false;
    01958       break;
    01959
    01960     case TL_3X3_GRID:
    01961       if ((grid_pos.x % 4) == 0 || (grid_pos.y % 4) == 0) return false;
    01962       break;
    01963
    01964     default:
    01965       break;
    01966   }
    01967
    01968   return true;
    01969 }
    01970
    01971
    01979 static inline bool TownLayoutAllows2x2HouseHere(Town *t, TileIndex tile)
    01980 {
    01981   /* Allow towns everywhere when we don't build roads */
    01982   if (!_settings_game.economy.allow_town_roads && !_generating_world) return true;
    01983
    01984   /* MapSize() is sure dividable by both MapSizeX() and MapSizeY(),
    01985    * so to do only one memory access, use MapSize() */
    01986   uint dx = MapSize() + TileX(t->xy) - TileX(tile);
    01987   uint dy = MapSize() + TileY(t->xy) - TileY(tile);
    01988
    01989   switch (t->layout) {
    01990     case TL_2X2_GRID:
    01991       if ((dx % 3) != 0 || (dy % 3) != 0) return false;
    01992       break;
    01993
    01994     case TL_3X3_GRID:
    01995       if ((dx % 4) < 2 || (dy % 4) < 2) return false;
    01996       break;
    01997
    01998     default:
    01999       break;
    02000   }
    02001
    02002   return true;
    02003 }
    02004
    02005
    02015 static bool CheckTownBuild2House(TileIndex *tile, Town *t, uint maxz, bool noslope, DiagDirection second)
    02016 {
    02017   /* 'tile' is already checked in BuildTownHouse() - CanBuildHouseHere() and slope test */
    02018
    02019   TileIndex tile2 = *tile + TileOffsByDiagDir(second);
    02020   if (TownLayoutAllowsHouseHere(t, tile2) && CheckBuildHouseSameZ(tile2, t->index, maxz, noslope)) return true;
    02021
    02022   tile2 = *tile + TileOffsByDiagDir(ReverseDiagDir(second));
    02023   if (TownLayoutAllowsHouseHere(t, tile2) && CheckBuildHouseSameZ(tile2, t->index, maxz, noslope)) {
    02024     *tile = tile2;
    02025     return true;
    02026   }
    02027
    02028   return false;
    02029 }
    02030
    02031
    02040 static bool CheckTownBuild2x2House(TileIndex *tile, Town *t, uint maxz, bool noslope)
    02041 {
    02042   TileIndex tile2 = *tile;
    02043
    02044   for (DiagDirection d = DIAGDIR_SE;;d++) { // 'd' goes through DIAGDIR_SE, DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_END
    02045     if (TownLayoutAllows2x2HouseHere(t, tile2) && CheckFree2x2Area(tile2, t->index, maxz, noslope)) {
    02046       *tile = tile2;
    02047       return true;
    02048     }
    02049     if (d == DIAGDIR_END) break;
    02050     tile2 += TileOffsByDiagDir(ReverseDiagDir(d)); // go clockwise
    02051   }
    02052
    02053   return false;
    02054 }
    02055
    02056
    02063 static bool BuildTownHouse(Town *t, TileIndex tile)
    02064 {
    02065   /* forbidden building here by town layout */
    02066   if (!TownLayoutAllowsHouseHere(t, tile)) return false;
    02067
    02068   /* no house allowed at all, bail out */
    02069   if (!CanBuildHouseHere(tile, t->index, false)) return false;
    02070
    02071   uint z;
    02072   Slope slope = GetTileSlope(tile, &z);
    02073
    02074   /* Get the town zone type of the current tile, as well as the climate.
    02075    * This will allow to easily compare with the specs of the new house to build */
    02076   HouseZonesBits rad = GetTownRadiusGroup(t, tile);
    02077
    02078   /* Above snow? */
    02079   int land = _settings_game.game_creation.landscape;
    02080   if (land == LT_ARCTIC && z >= _settings_game.game_creation.snow_line) land = -1;
    02081
    02082   uint bitmask = (1 << rad) + (1 << (land + 12));
    02083
    02084   /* bits 0-4 are used
    02085    * bits 11-15 are used
    02086    * bits 5-10 are not used. */
    02087   HouseID houses[HOUSE_MAX];
    02088   uint num = 0;
    02089   uint probs[HOUSE_MAX];
    02090   uint probability_max = 0;
    02091
    02092   /* Generate a list of all possible houses that can be built. */
    02093   for (uint i = 0; i < HOUSE_MAX; i++) {
    02094     const HouseSpec *hs = HouseSpec::Get(i);
    02095
    02096     /* Verify that the candidate house spec matches the current tile status */
    02097     if ((~hs->building_availability & bitmask) != 0 || !hs->enabled || hs->override != INVALID_HOUSE_ID) continue;
    02098
    02099     /* Don't let these counters overflow. Global counters are 32bit, there will never be that many houses. */
    02100     if (hs->class_id != HOUSE_NO_CLASS) {
    02101       /* id_count is always <= class_count, so it doesn't need to be checked */
    02102       if (t->building_counts.class_count[hs->class_id] == UINT16_MAX) continue;
    02103     } else {
    02104       /* If the house has no class, check id_count instead */
    02105       if (t->building_counts.id_count[i] == UINT16_MAX) continue;
    02106     }
    02107
    02108     /* Without NewHouses, all houses have probability '1' */
    02109     uint cur_prob = (_loaded_newgrf_features.has_newhouses ? hs->probability : 1);
    02110     probability_max += cur_prob;
    02111     probs[num] = cur_prob;
    02112     houses[num++] = (HouseID)i;
    02113   }
    02114
    02115   uint maxz = GetTileMaxZ(tile);
    02116
    02117   while (probability_max > 0) {
    02118     uint r = RandomRange(probability_max);
    02119     uint i;
    02120     for (i = 0; i < num; i++) {
    02121       if (probs[i] > r) break;
    02122       r -= probs[i];
    02123     }
    02124
    02125     HouseID house = houses[i];
    02126     probability_max -= probs[i];
    02127
    02128     /* remove tested house from the set */
    02129     num--;
    02130     houses[i] = houses[num];
    02131     probs[i] = probs[num];
    02132
    02133     const HouseSpec *hs = HouseSpec::Get(house);
    02134
    02135     if (_loaded_newgrf_features.has_newhouses && !_generating_world &&
    02136         _game_mode != GM_EDITOR && (hs->extra_flags & BUILDING_IS_HISTORICAL) != 0) {
    02137       continue;
    02138     }
    02139
    02140     if (_cur_year < hs->min_year || _cur_year > hs->max_year) continue;
    02141
    02142     /* Special houses that there can be only one of. */
    02143     uint oneof = 0;
    02144
    02145     if (hs->building_flags & BUILDING_IS_CHURCH) {
    02146       SetBit(oneof, TOWN_HAS_CHURCH);
    02147     } else if (hs->building_flags & BUILDING_IS_STADIUM) {
    02148       SetBit(oneof, TOWN_HAS_STADIUM);
    02149     }
    02150
    02151     if (t->flags & oneof) continue;
    02152
    02153     /* Make sure there is no slope? */
    02154     bool noslope = (hs->building_flags & TILE_NOT_SLOPED) != 0;
    02155     if (noslope && slope != SLOPE_FLAT) continue;
    02156
    02157     if (hs->building_flags & TILE_SIZE_2x2) {
    02158       if (!CheckTownBuild2x2House(&tile, t, maxz, noslope)) continue;
    02159     } else if (hs->building_flags & TILE_SIZE_2x1) {
    02160       if (!CheckTownBuild2House(&tile, t, maxz, noslope, DIAGDIR_SW)) continue;
    02161     } else if (hs->building_flags & TILE_SIZE_1x2) {
    02162       if (!CheckTownBuild2House(&tile, t, maxz, noslope, DIAGDIR_SE)) continue;
    02163     } else {
    02164       /* 1x1 house checks are already done */
    02165     }
    02166
    02167     if (HasBit(hs->callback_mask, CBM_HOUSE_ALLOW_CONSTRUCTION)) {
    02168       uint16 callback_res = GetHouseCallback(CBID_HOUSE_ALLOW_CONSTRUCTION, 0, 0, house, t, tile);
    02169       if (callback_res != CALLBACK_FAILED && GB(callback_res, 0, 8) == 0) continue;
    02170     }
    02171
    02172     /* build the house */
    02173     t->num_houses++;
    02174
    02175     /* Special houses that there can be only one of. */
    02176     t->flags |= oneof;
    02177
    02178     byte construction_counter = 0;
    02179     byte construction_stage = 0;
    02180
    02181     if (_generating_world || _game_mode == GM_EDITOR) {
    02182       uint32 r = Random();
    02183
    02184       construction_stage = TOWN_HOUSE_COMPLETED;
    02185       if (Chance16(1, 7)) construction_stage = GB(r, 0, 2);
    02186
    02187       if (construction_stage == TOWN_HOUSE_COMPLETED) {
    02188         ChangePopulation(t, hs->population);
    02189       } else {
    02190         construction_counter = GB(r, 2, 2);
    02191       }
    02192     }
    02193
    02194     MakeTownHouse(tile, t, construction_counter, construction_stage, house, Random());
    02195
    02196     return true;
    02197   }
    02198
    02199   return false;
    02200 }
    02201
    02208 static void DoClearTownHouseHelper(TileIndex tile, Town *t, HouseID house)
    02209 {
    02210   assert(IsTileType(tile, MP_HOUSE));
    02211   DecreaseBuildingCount(t, house);
    02212   DoClearSquare(tile);
    02213   DeleteAnimatedTile(tile);
    02214 }
    02215
    02223 TileIndexDiff GetHouseNorthPart(HouseID &house)
    02224 {
    02225   if (house >= 3) { // house id 0,1,2 MUST be single tile houses, or this code breaks.
    02226     if (HouseSpec::Get(house - 1)->building_flags & TILE_SIZE_2x1) {
    02227       house--;
    02228       return TileDiffXY(-1, 0);
    02229     } else if (HouseSpec::Get(house - 1)->building_flags & BUILDING_2_TILES_Y) {
    02230       house--;
    02231       return TileDiffXY(0, -1);
    02232     } else if (HouseSpec::Get(house - 2)->building_flags & BUILDING_HAS_4_TILES) {
    02233       house -= 2;
    02234       return TileDiffXY(-1, 0);
    02235     } else if (HouseSpec::Get(house - 3)->building_flags & BUILDING_HAS_4_TILES) {
    02236       house -= 3;
    02237       return TileDiffXY(-1, -1);
    02238     }
    02239   }
    02240   return 0;
    02241 }
    02242
    02243 void ClearTownHouse(Town *t, TileIndex tile)
    02244 {
    02245   assert(IsTileType(tile, MP_HOUSE));
    02246
    02247   HouseID house = GetHouseType(tile);
    02248
    02249   /* need to align the tile to point to the upper left corner of the house */
    02250   tile += GetHouseNorthPart(house); // modifies house to the ID of the north tile
    02251
    02252   const HouseSpec *hs = HouseSpec::Get(house);
    02253
    02254   /* Remove population from the town if the house is finished. */
    02255   if (IsHouseCompleted(tile)) {
    02256     ChangePopulation(t, -hs->population);
    02257   }
    02258
    02259   t->num_houses--;
    02260
    02261   /* Clear flags for houses that only may exist once/town. */
    02262   if (hs->building_flags & BUILDING_IS_CHURCH) {
    02263     ClrBit(t->flags, TOWN_HAS_CHURCH);
    02264   } else if (hs->building_flags & BUILDING_IS_STADIUM) {
    02265     ClrBit(t->flags, TOWN_HAS_STADIUM);
    02266   }
    02267
    02268   /* Do the actual clearing of tiles */
    02269   uint eflags = hs->building_flags;
    02270   DoClearTownHouseHelper(tile, t, house);
    02271   if (eflags & BUILDING_2_TILES_Y)   DoClearTownHouseHelper(tile + TileDiffXY(0, 1), t, ++house);
    02272   if (eflags & BUILDING_2_TILES_X)   DoClearTownHouseHelper(tile + TileDiffXY(1, 0), t, ++house);
    02273   if (eflags & BUILDING_HAS_4_TILES) DoClearTownHouseHelper(tile + TileDiffXY(1, 1), t, ++house);
    02274 }
    02275
    02284 CommandCost CmdRenameTown(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    02285 {
    02286   Town *t = Town::GetIfValid(p1);
    02287   if (t == NULL) return CMD_ERROR;
    02288
    02289   bool reset = StrEmpty(text);
    02290
    02291   if (!reset) {
    02292     if (strlen(text) >= MAX_LENGTH_TOWN_NAME_BYTES) return CMD_ERROR;
    02293     if (!IsUniqueTownName(text)) return_cmd_error(STR_ERROR_NAME_MUST_BE_UNIQUE);
    02294   }
    02295
    02296   if (flags & DC_EXEC) {
    02297     free(t->name);
    02298     t->name = reset ? NULL : strdup(text);
    02299
    02300     t->UpdateVirtCoord();
    02301     InvalidateWindowData(WC_TOWN_DIRECTORY, 0, 1);
    02302     UpdateAllStationVirtCoords();
    02303   }
    02304   return CommandCost();
    02305 }
    02306
    02308 void ExpandTown(Town *t)
    02309 {
    02310   /* Warn the users if towns are not allowed to build roads,
    02311    * but do this only onces per openttd run. */
    02312   static bool warned_no_roads = false;
    02313   if (!_settings_game.economy.allow_town_roads && !warned_no_roads) {
    02314     ShowErrorMessage(STR_ERROR_TOWN_EXPAND_WARN_NO_ROADS, INVALID_STRING_ID, 0, 0);
    02315     warned_no_roads = true;
    02316   }
    02317
    02318   /* The more houses, the faster we grow */
    02319   uint amount = RandomRange(ClampToU16(t->num_houses / 10)) + 3;
    02320   t->num_houses += amount;
    02321   UpdateTownRadius(t);
    02322
    02323   uint n = amount * 10;
    02324   do GrowTown(t); while (--n);
    02325
    02326   t->num_houses -= amount;
    02327   UpdateTownRadius(t);
    02328
    02329   UpdateTownMaxPass(t);
    02330 }
    02331
    02335 const byte _town_action_costs[TACT_COUNT] = {
    02336   2, 4, 9, 35, 48, 53, 117, 175
    02337 };
    02338
    02339 static void TownActionAdvertiseSmall(Town *t)
    02340 {
    02341   ModifyStationRatingAround(t->xy, _current_company, 0x40, 10);
    02342 }
    02343
    02344 static void TownActionAdvertiseMedium(Town *t)
    02345 {
    02346   ModifyStationRatingAround(t->xy, _current_company, 0x70, 15);
    02347 }
    02348
    02349 static void TownActionAdvertiseLarge(Town *t)
    02350 {
    02351   ModifyStationRatingAround(t->xy, _current_company, 0xA0, 20);
    02352 }
    02353
    02354 static void TownActionRoadRebuild(Town *t)
    02355 {
    02356   t->road_build_months = 6;
    02357
    02358   char company_name[MAX_LENGTH_COMPANY_NAME_BYTES];
    02359   SetDParam(0, _current_company);
    02360   GetString(company_name, STR_COMPANY_NAME, lastof(company_name));
    02361
    02362   char *cn = strdup(company_name);
    02363   SetDParam(0, t->index);
    02364   SetDParamStr(1, cn);
    02365
    02366   AddNewsItem(STR_NEWS_ROAD_REBUILDING, NS_GENERAL, NR_TOWN, t->index, NR_NONE, UINT32_MAX, cn);
    02367 }
    02368
    02369 static bool DoBuildStatueOfCompany(TileIndex tile, TownID town_id)
    02370 {
    02371   /* Statues can be build on slopes, just like houses. Only the steep slopes is a no go. */
    02372   if (IsSteepSlope(GetTileSlope(tile, NULL))) return false;
    02373   /* Don't build statues under bridges. */
    02374   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return false;
    02375
    02376   if (!IsTileType(tile, MP_HOUSE) &&
    02377       !IsTileType(tile, MP_CLEAR) &&
    02378       !IsTileType(tile, MP_TREES)) {
    02379     return false;
    02380   }
    02381
    02382   CompanyID old = _current_company;
    02383   _current_company = OWNER_NONE;
    02384   CommandCost r = DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
    02385   _current_company = old;
    02386
    02387   if (CmdFailed(r)) return false;
    02388
    02389   MakeStatue(tile, _current_company, town_id);
    02390   MarkTileDirtyByTile(tile);
    02391
    02392   return true;
    02393 }
    02394
    02401 static bool SearchTileForStatue(TileIndex tile, void *user_data)
    02402 {
    02403   TownID *town_id = (TownID *)user_data;
    02404   return DoBuildStatueOfCompany(tile, *town_id);
    02405 }
    02406
    02412 static void TownActionBuildStatue(Town *t)
    02413 {
    02414   TileIndex tile = t->xy;
    02415
    02416   if (CircularTileSearch(&tile, 9, SearchTileForStatue, &t->index)) {
    02417     SetBit(t->statues, _current_company); // Once found and built, "inform" the Town
    02418   }
    02419 }
    02420
    02421 static void TownActionFundBuildings(Town *t)
    02422 {
    02423   /* Build next tick */
    02424   t->grow_counter = 1;
    02425   /* If we were not already growing */
    02426   SetBit(t->flags, TOWN_IS_FUNDED);
    02427   /* And grow for 3 months */
    02428   t->fund_buildings_months = 3;
    02429 }
    02430
    02431 static void TownActionBuyRights(Town *t)
    02432 {
    02433   /* Check if it's allowed to by the rights */
    02434   if (!_settings_game.economy.exclusive_rights) return;
    02435
    02436   t->exclusive_counter = 12;
    02437   t->exclusivity = _current_company;
    02438
    02439   ModifyStationRatingAround(t->xy, _current_company, 130, 17);
    02440 }
    02441
    02442 static void TownActionBribe(Town *t)
    02443 {
    02444   if (Chance16(1, 14)) {
    02445     /* set as unwanted for 6 months */
    02446     t->unwanted[_current_company] = 6;
    02447
    02448     /* set all close by station ratings to 0 */
    02449     Station *st;
    02450     FOR_ALL_STATIONS(st) {
    02451       if (st->town == t && st->owner == _current_company) {
    02452         for (CargoID i = 0; i < NUM_CARGO; i++) st->goods[i].rating = 0;
    02453       }
    02454     }
    02455
    02456     /* only show errormessage to the executing player. All errors are handled command.c
    02457      * but this is special, because it can only 'fail' on a DC_EXEC */
    02458     if (IsLocalCompany()) ShowErrorMessage(STR_ERROR_BRIBE_FAILED, STR_ERROR_BRIBE_FAILED_2, 0, 0);
    02459
    02460     /* decrease by a lot!
    02461      * ChangeTownRating is only for stuff in demolishing. Bribe failure should
    02462      * be independent of any cheat settings
    02463      */
    02464     if (t->ratings[_current_company] > RATING_BRIBE_DOWN_TO) {
    02465       t->ratings[_current_company] = RATING_BRIBE_DOWN_TO;
    02466       SetWindowDirty(WC_TOWN_AUTHORITY, t->index);
    02467     }
    02468   } else {
    02469     ChangeTownRating(t, RATING_BRIBE_UP_STEP, RATING_BRIBE_MAXIMUM, DC_EXEC);
    02470   }
    02471 }
    02472
    02473 typedef void TownActionProc(Town *t);
    02474 static TownActionProc * const _town_action_proc[] = {
    02475   TownActionAdvertiseSmall,
    02476   TownActionAdvertiseMedium,
    02477   TownActionAdvertiseLarge,
    02478   TownActionRoadRebuild,
    02479   TownActionBuildStatue,
    02480   TownActionFundBuildings,
    02481   TownActionBuyRights,
    02482   TownActionBribe
    02483 };
    02484
    02491 uint GetMaskOfTownActions(int *nump, CompanyID cid, const Town *t)
    02492 {
    02493   int num = 0;
    02494   TownActions buttons = TACT_NONE;
    02495
    02496   /* Spectators and unwanted have no options */
    02497   if (cid != COMPANY_SPECTATOR && !(_settings_game.economy.bribe && t->unwanted[cid])) {
    02498
    02499     /* Things worth more than this are not shown */
    02500     Money avail = Company::Get(cid)->money + _price[PR_STATION_VALUE] * 200;
    02501
    02502     /* Check the action bits for validity and
    02503      * if they are valid add them */
    02504     for (uint i = 0; i != lengthof(_town_action_costs); i++) {
    02505       const TownActions cur = (TownActions)(1 << i);
    02506
    02507       /* Is the company not able to bribe ? */
    02508       if (cur == TACT_BRIBE && (!_settings_game.economy.bribe || t->ratings[cid] >= RATING_BRIBE_MAXIMUM))
    02509         continue;
    02510
    02511       /* Is the company not able to buy exclusive rights ? */
    02512       if (cur == TACT_BUY_RIGHTS && !_settings_game.economy.exclusive_rights)
    02513         continue;
    02514
    02515       /* Is the company not able to build a statue ? */
    02516       if (cur == TACT_BUILD_STATUE && HasBit(t->statues, cid))
    02517         continue;
    02518
    02519       if (avail >= _town_action_costs[i] * _price[PR_TOWN_ACTION] >> 8) {
    02520         buttons |= cur;
    02521         num++;
    02522       }
    02523     }
    02524   }
    02525
    02526   if (nump != NULL) *nump = num;
    02527   return buttons;
    02528 }
    02529
    02540 CommandCost CmdDoTownAction(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    02541 {
    02542   Town *t = Town::GetIfValid(p1);
    02543   if (t == NULL || p2 >= lengthof(_town_action_proc)) return CMD_ERROR;
    02544
    02545   if (!HasBit(GetMaskOfTownActions(NULL, _current_company, t), p2)) return CMD_ERROR;
    02546
    02547   CommandCost cost(EXPENSES_OTHER, _price[PR_TOWN_ACTION] * _town_action_costs[p2] >> 8);
    02548
    02549   if (flags & DC_EXEC) {
    02550     _town_action_proc[p2](t);
    02551     SetWindowDirty(WC_TOWN_AUTHORITY, p1);
    02552   }
    02553
    02554   return cost;
    02555 }
    02556
    02557 static void UpdateTownGrowRate(Town *t)
    02558 {
    02559   /* Increase company ratings if they're low */
    02560   const Company *c;
    02561   FOR_ALL_COMPANIES(c) {
    02562     if (t->ratings[c->index] < RATING_GROWTH_MAXIMUM) {
    02563       t->ratings[c->index] = min((int)RATING_GROWTH_MAXIMUM, t->ratings[c->index] + RATING_GROWTH_UP_STEP);
    02564     }
    02565   }
    02566
    02567   int n = 0;
    02568
    02569   const Station *st;
    02570   FOR_ALL_STATIONS(st) {
    02571     if (DistanceSquare(st->xy, t->xy) <= t->squared_town_zone_radius[0]) {
    02572       if (st->time_since_load <= 20 || st->time_since_unload <= 20) {
    02573         n++;
    02574         if (Company::IsValidID(st->owner)) {
    02575           int new_rating = t->ratings[st->owner] + RATING_STATION_UP_STEP;
    02576           t->ratings[st->owner] = min(new_rating, INT16_MAX); // do not let it overflow
    02577         }
    02578       } else {
    02579         if (Company::IsValidID(st->owner)) {
    02580           int new_rating = t->ratings[st->owner] + RATING_STATION_DOWN_STEP;
    02581           t->ratings[st->owner] = max(new_rating, INT16_MIN);
    02582         }
    02583       }
    02584     }
    02585   }
    02586
    02587   /* clamp all ratings to valid values */
    02588   for (uint i = 0; i < MAX_COMPANIES; i++) {
    02589     t->ratings[i] = Clamp(t->ratings[i], RATING_MINIMUM, RATING_MAXIMUM);
    02590   }
    02591
    02592   SetWindowDirty(WC_TOWN_AUTHORITY, t->index);
    02593
    02594   ClrBit(t->flags, TOWN_IS_FUNDED);
    02595   if (_settings_game.economy.town_growth_rate == 0 && t->fund_buildings_months == 0) return;
    02596
    02599   static const uint16 _grow_count_values[2][6] = {
    02600     { 120, 120, 120, 100,  80,  60 }, // Fund new buildings has been activated
    02601     { 320, 420, 300, 220, 160, 100 }  // Normal values
    02602   };
    02603
    02604   uint16 m;
    02605
    02606   if (t->fund_buildings_months != 0) {
    02607     m = _grow_count_values[0][min(n, 5)];
    02608     t->fund_buildings_months--;
    02609   } else {
    02610     m = _grow_count_values[1][min(n, 5)];
    02611     if (n == 0 && !Chance16(1, 12)) return;
    02612   }
    02613
    02614   if (_settings_game.game_creation.landscape == LT_ARCTIC) {
    02615     if (TilePixelHeight(t->xy) >= GetSnowLine() && t->act_food == 0 && t->population > 90)
    02616       return;
    02617   } else if (_settings_game.game_creation.landscape == LT_TROPIC) {
    02618     if (GetTropicZone(t->xy) == TROPICZONE_DESERT && (t->act_food == 0 || t->act_water == 0) && t->population > 60)
    02619       return;
    02620   }
    02621
    02622   /* Use the normal growth rate values if new buildings have been funded in
    02623    * this town and the growth rate is set to none. */
    02624   uint growth_multiplier = _settings_game.economy.town_growth_rate != 0 ? _settings_game.economy.town_growth_rate - 1 : 1;
    02625
    02626   m >>= growth_multiplier;
    02627   if (t->larger_town) m /= 2;
    02628
    02629   t->growth_rate = m / (t->num_houses / 50 + 1);
    02630   if (m <= t->grow_counter)
    02631     t->grow_counter = m;
    02632
    02633   SetBit(t->flags, TOWN_IS_FUNDED);
    02634 }
    02635
    02636 static void UpdateTownAmounts(Town *t)
    02637 {
    02638   /* Using +1 here to prevent overflow and division by zero */
    02639   t->pct_pass_transported = t->new_act_pass * 256 / (t->new_max_pass + 1);
    02640
    02641   t->max_pass = t->new_max_pass; t->new_max_pass = 0;
    02642   t->act_pass = t->new_act_pass; t->new_act_pass = 0;
    02643   t->act_food = t->new_act_food; t->new_act_food = 0;
    02644   t->act_water = t->new_act_water; t->new_act_water = 0;
    02645
    02646   /* Using +1 here to prevent overflow and division by zero */
    02647   t->pct_mail_transported = t->new_act_mail * 256 / (t->new_max_mail + 1);
    02648   t->max_mail = t->new_max_mail; t->new_max_mail = 0;
    02649   t->act_mail = t->new_act_mail; t->new_act_mail = 0;
    02650
    02651   SetWindowDirty(WC_TOWN_VIEW, t->index);
    02652 }
    02653
    02654 static void UpdateTownUnwanted(Town *t)
    02655 {
    02656   const Company *c;
    02657
    02658   FOR_ALL_COMPANIES(c) {
    02659     if (t->unwanted[c->index] > 0) t->unwanted[c->index]--;
    02660   }
    02661 }
    02662
    02668 bool CheckIfAuthorityAllowsNewStation(TileIndex tile, DoCommandFlag flags)
    02669 {
    02670   if (!Company::IsValidID(_current_company) || (flags & DC_NO_TEST_TOWN_RATING)) return true;
    02671
    02672   Town *t = ClosestTownFromTile(tile, _settings_game.economy.dist_local_authority);
    02673   if (t == NULL) return true;
    02674
    02675   if (t->ratings[_current_company] > RATING_VERYPOOR) return true;
    02676
    02677   _error_message = STR_ERROR_LOCAL_AUTHORITY_REFUSES_TO_ALLOW_THIS;
    02678   SetDParam(0, t->index);
    02679
    02680   return false;
    02681 }
    02682
    02683
    02684 Town *CalcClosestTownFromTile(TileIndex tile, uint threshold)
    02685 {
    02686   Town *t;
    02687   uint best = threshold;
    02688   Town *best_town = NULL;
    02689
    02690   FOR_ALL_TOWNS(t) {
    02691     uint dist = DistanceManhattan(tile, t->xy);
    02692     if (dist < best) {
    02693       best = dist;
    02694       best_town = t;
    02695     }
    02696   }
    02697
    02698   return best_town;
    02699 }
    02700
    02701
    02702 Town *ClosestTownFromTile(TileIndex tile, uint threshold)
    02703 {
    02704   switch (GetTileType(tile)) {
    02705     case MP_ROAD:
    02706       if (IsRoadDepot(tile)) return CalcClosestTownFromTile(tile, threshold);
    02707
    02708       if (!HasTownOwnedRoad(tile)) {
    02709         TownID tid = GetTownIndex(tile);
    02710
    02711         if (tid == (TownID)INVALID_TOWN) {
    02712           /* in the case we are generating "many random towns", this value may be INVALID_TOWN */
    02713           if (_generating_world) return CalcClosestTownFromTile(tile, threshold);
    02714           assert(Town::GetNumItems() == 0);
    02715           return NULL;
    02716         }
    02717
    02718         assert(Town::IsValidID(tid));
    02719         Town *town = Town::Get(tid);
    02720
    02721         if (DistanceManhattan(tile, town->xy) >= threshold) town = NULL;
    02722
    02723         return town;
    02724       }
    02725       /* FALL THROUGH */
    02726
    02727     case MP_HOUSE:
    02728       return Town::GetByTile(tile);
    02729
    02730     default:
    02731       return CalcClosestTownFromTile(tile, threshold);
    02732   }
    02733 }
    02734
    02735 static bool _town_rating_test = false;
    02736 static SmallMap<const Town *, int, 4> _town_test_ratings;
    02737
    02738 void SetTownRatingTestMode(bool mode)
    02739 {
    02740   static int ref_count = 0;
    02741   if (mode) {
    02742     if (ref_count == 0) {
    02743       _town_test_ratings.Clear();
    02744     }
    02745     ref_count++;
    02746   } else {
    02747     assert(ref_count > 0);
    02748     ref_count--;
    02749   }
    02750   _town_rating_test = !(ref_count == 0);
    02751 }
    02752
    02753 static int GetRating(const Town *t)
    02754 {
    02755   if (_town_rating_test) {
    02756     SmallMap<const Town *, int>::iterator it = _town_test_ratings.Find(t);
    02757     if (it != _town_test_ratings.End()) {
    02758       return it->second;
    02759     }
    02760   }
    02761   return t->ratings[_current_company];
    02762 }
    02763
    02771 void ChangeTownRating(Town *t, int add, int max, DoCommandFlag flags)
    02772 {
    02773   /* if magic_bulldozer cheat is active, town doesn't penaltize for removing stuff */
    02774   if (t == NULL || (flags & DC_NO_MODIFY_TOWN_RATING) ||
    02775       !Company::IsValidID(_current_company) ||
    02776       (_cheats.magic_bulldozer.value && add < 0)) {
    02777     return;
    02778   }
    02779
    02780   int rating = GetRating(t);
    02781   if (add < 0) {
    02782     if (rating > max) {
    02783       rating += add;
    02784       if (rating < max) rating = max;
    02785     }
    02786   } else {
    02787     if (rating < max) {
    02788       rating += add;
    02789       if (rating > max) rating = max;
    02790     }
    02791   }
    02792   if (_town_rating_test) {
    02793     _town_test_ratings[t] = rating;
    02794   } else {
    02795     SetBit(t->have_ratings, _current_company);
    02796     t->ratings[_current_company] = rating;
    02797     SetWindowDirty(WC_TOWN_AUTHORITY, t->index);
    02798   }
    02799 }
    02800
    02801 bool CheckforTownRating(DoCommandFlag flags, Town *t, TownRatingCheckType type)
    02802 {
    02803   /* if magic_bulldozer cheat is active, town doesn't restrict your destructive actions */
    02804   if (t == NULL || !Company::IsValidID(_current_company) ||
    02805       _cheats.magic_bulldozer.value || (flags & DC_NO_TEST_TOWN_RATING)) {
    02806     return true;
    02807   }
    02808
    02809   /* minimum rating needed to be allowed to remove stuff */
    02810   static const int needed_rating[][TOWN_RATING_CHECK_TYPE_COUNT] = {
    02811     /*                  ROAD_REMOVE,                    TUNNELBRIDGE_REMOVE */
    02812     { RATING_ROAD_NEEDED_PERMISSIVE, RATING_TUNNEL_BRIDGE_NEEDED_PERMISSIVE}, // Permissive
    02813     {    RATING_ROAD_NEEDED_NEUTRAL,    RATING_TUNNEL_BRIDGE_NEEDED_NEUTRAL}, // Neutral
    02814     {    RATING_ROAD_NEEDED_HOSTILE,    RATING_TUNNEL_BRIDGE_NEEDED_HOSTILE}, // Hostile
    02815   };
    02816
    02817   /* check if you're allowed to remove the road/bridge/tunnel
    02818    * owned by a town no removal if rating is lower than ... depends now on
    02819    * difficulty setting. Minimum town rating selected by difficulty level
    02820    */
    02821   int needed = needed_rating[_settings_game.difficulty.town_council_tolerance][type];
    02822
    02823   if (GetRating(t) < needed) {
    02824     SetDParam(0, t->index);
    02825     _error_message = STR_ERROR_LOCAL_AUTHORITY_REFUSES_TO_ALLOW_THIS;
    02826     return false;
    02827   }
    02828
    02829   return true;
    02830 }
    02831
    02832 void TownsMonthlyLoop()
    02833 {
    02834   Town *t;
    02835
    02836   FOR_ALL_TOWNS(t) {
    02837     if (t->road_build_months != 0) t->road_build_months--;
    02838
    02839     if (t->exclusive_counter != 0)
    02840       if (--t->exclusive_counter == 0) t->exclusivity = INVALID_COMPANY;
    02841
    02842     UpdateTownGrowRate(t);
    02843     UpdateTownAmounts(t);
    02844     UpdateTownUnwanted(t);
    02845   }
    02846 }
    02847
    02848 void TownsYearlyLoop()
    02849 {
    02850   /* Increment house ages */
    02851   for (TileIndex t = 0; t < MapSize(); t++) {
    02852     if (!IsTileType(t, MP_HOUSE)) continue;
    02853     IncrementHouseAge(t);
    02854   }
    02855 }
    02856
    02857 void InitializeTowns()
    02858 {
    02859   _town_pool.CleanPool();
    02860 }
    02861
    02862 static CommandCost TerraformTile_Town(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
    02863 {
    02864   if (AutoslopeEnabled()) {
    02865     HouseID house = GetHouseType(tile);
    02866     GetHouseNorthPart(house); // modifies house to the ID of the north tile
    02867     const HouseSpec *hs = HouseSpec::Get(house);
    02868
    02869     /* Here we differ from TTDP by checking TILE_NOT_SLOPED */
    02870     if (((hs->building_flags & TILE_NOT_SLOPED) == 0) && !IsSteepSlope(tileh_new) &&
    02871         (GetTileMaxZ(tile) == z_new + GetSlopeMaxZ(tileh_new))) {
    02872       bool allow_terraform = true;
    02873
    02874       /* Call the autosloping callback per tile, not for the whole building at once. */
    02875       house = GetHouseType(tile);
    02876       hs = HouseSpec::Get(house);
    02877       if (HasBit(hs->callback_mask, CBM_HOUSE_AUTOSLOPE)) {
    02878         /* If the callback fails, allow autoslope. */
    02879         uint16 res = GetHouseCallback(CBID_HOUSE_AUTOSLOPE, 0, 0, house, Town::GetByTile(tile), tile);
    02880         if ((res != 0) && (res != CALLBACK_FAILED)) allow_terraform = false;
    02881       }
    02882
    02883       if (allow_terraform) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    02884     }
    02885   }
    02886
    02887   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    02888 }
    02889
    02891 extern const TileTypeProcs _tile_type_town_procs = {
    02892   DrawTile_Town,           // draw_tile_proc
    02893   GetSlopeZ_Town,          // get_slope_z_proc
    02894   ClearTile_Town,          // clear_tile_proc
    02895   AddAcceptedCargo_Town,   // add_accepted_cargo_proc
    02896   GetTileDesc_Town,        // get_tile_desc_proc
    02897   GetTileTrackStatus_Town, // get_tile_track_status_proc
    02898   NULL,                    // click_tile_proc
    02899   AnimateTile_Town,        // animate_tile_proc
    02900   TileLoop_Town,           // tile_loop_clear
    02901   ChangeTileOwner_Town,    // change_tile_owner_clear
    02902   AddProducedCargo_Town,   // add_produced_cargo_proc
    02903   NULL,                    // vehicle_enter_tile_proc
    02904   GetFoundation_Town,      // get_foundation_proc
    02905   TerraformTile_Town,      // terraform_tile_proc
    02906 };
    02907
    02908
    02909 HouseSpec _house_specs[HOUSE_MAX];
    02910
    02911 void ResetHouses()
    02912 {
    02913   memset(&_house_specs, 0, sizeof(_house_specs));
    02914   memcpy(&_house_specs, &_original_house_specs, sizeof(_original_house_specs));
    02915
    02916   /* Reset any overrides that have been set. */
    02917   _house_mngr.ResetOverride();
    02918 }