road_cmd.cpp

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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 "cmd_helper.h"
00014 #include "road_internal.h"
00015 #include "viewport_func.h"
00016 #include "command_func.h"
00017 #include "pathfinder/yapf/yapf_cache.h"
00018 #include "depot_base.h"
00019 #include "newgrf.h"
00020 #include "autoslope.h"
00021 #include "tunnelbridge_map.h"
00022 #include "window_func.h"
00023 #include "strings_func.h"
00024 #include "vehicle_func.h"
00025 #include "sound_func.h"
00026 #include "tunnelbridge.h"
00027 #include "cheat_type.h"
00028 #include "effectvehicle_func.h"
00029 #include "effectvehicle_base.h"
00030 #include "elrail_func.h"
00031 #include "roadveh.h"
00032 #include "town.h"
00033 #include "company_base.h"
00034 #include "core/random_func.hpp"
00035 #include "newgrf_railtype.h"
00036 #include "date_func.h"
00037 #include "genworld.h"
00038 #include "company_gui.h"
00039 
00040 #include "table/strings.h"
00041 
00046 bool RoadVehiclesAreBuilt()
00047 {
00048   const RoadVehicle *rv;
00049   FOR_ALL_ROADVEHICLES(rv) return true;
00050 
00051   return false;
00052 }
00053 
00055 static const RoadBits _invalid_tileh_slopes_road[2][15] = {
00056   /* The inverse of the mixable RoadBits on a leveled slope */
00057   {
00058     ROAD_NONE,         // SLOPE_FLAT
00059     ROAD_NE | ROAD_SE, // SLOPE_W
00060     ROAD_NE | ROAD_NW, // SLOPE_S
00061 
00062     ROAD_NE,           // SLOPE_SW
00063     ROAD_NW | ROAD_SW, // SLOPE_E
00064     ROAD_NONE,         // SLOPE_EW
00065 
00066     ROAD_NW,           // SLOPE_SE
00067     ROAD_NONE,         // SLOPE_WSE
00068     ROAD_SE | ROAD_SW, // SLOPE_N
00069 
00070     ROAD_SE,           // SLOPE_NW
00071     ROAD_NONE,         // SLOPE_NS
00072     ROAD_NONE,         // SLOPE_ENW
00073 
00074     ROAD_SW,           // SLOPE_NE
00075     ROAD_NONE,         // SLOPE_SEN
00076     ROAD_NONE          // SLOPE_NWS
00077   },
00078   /* The inverse of the allowed straight roads on a slope
00079    * (with and without a foundation). */
00080   {
00081     ROAD_NONE, // SLOPE_FLAT
00082     ROAD_NONE, // SLOPE_W    Foundation
00083     ROAD_NONE, // SLOPE_S    Foundation
00084 
00085     ROAD_Y,    // SLOPE_SW
00086     ROAD_NONE, // SLOPE_E    Foundation
00087     ROAD_ALL,  // SLOPE_EW
00088 
00089     ROAD_X,    // SLOPE_SE
00090     ROAD_ALL,  // SLOPE_WSE
00091     ROAD_NONE, // SLOPE_N    Foundation
00092 
00093     ROAD_X,    // SLOPE_NW
00094     ROAD_ALL,  // SLOPE_NS
00095     ROAD_ALL,  // SLOPE_ENW
00096 
00097     ROAD_Y,    // SLOPE_NE
00098     ROAD_ALL,  // SLOPE_SEN
00099     ROAD_ALL   // SLOPE_NW
00100   }
00101 };
00102 
00103 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits);
00104 
00115 CommandCost CheckAllowRemoveRoad(TileIndex tile, RoadBits remove, Owner owner, RoadType rt, DoCommandFlag flags, bool town_check)
00116 {
00117   if (_game_mode == GM_EDITOR || remove == ROAD_NONE) return CommandCost();
00118 
00119   /* Water can always flood and towns can always remove "normal" road pieces.
00120    * Towns are not be allowed to remove non "normal" road pieces, like tram
00121    * tracks as that would result in trams that cannot turn. */
00122   if (_current_company == OWNER_WATER ||
00123       (rt == ROADTYPE_ROAD && !Company::IsValidID(_current_company))) return CommandCost();
00124 
00125   /* Only do the special processing if the road is owned
00126    * by a town */
00127   if (owner != OWNER_TOWN) {
00128     if (owner == OWNER_NONE) return CommandCost();
00129     CommandCost ret = CheckOwnership(owner);
00130     return ret;
00131   }
00132 
00133   if (!town_check) return CommandCost();
00134 
00135   if (_cheats.magic_bulldozer.value) return CommandCost();
00136 
00137   Town *t = ClosestTownFromTile(tile, UINT_MAX);
00138   if (t == NULL) return CommandCost();
00139 
00140   /* check if you're allowed to remove the street owned by a town
00141    * removal allowance depends on difficulty setting */
00142   CommandCost ret = CheckforTownRating(flags, t, ROAD_REMOVE);
00143   if (ret.Failed()) return ret;
00144 
00145   /* Get a bitmask of which neighbouring roads has a tile */
00146   RoadBits n = ROAD_NONE;
00147   RoadBits present = GetAnyRoadBits(tile, rt);
00148   if ((present & ROAD_NE) && (GetAnyRoadBits(TILE_ADDXY(tile, -1,  0), rt) & ROAD_SW)) n |= ROAD_NE;
00149   if ((present & ROAD_SE) && (GetAnyRoadBits(TILE_ADDXY(tile,  0,  1), rt) & ROAD_NW)) n |= ROAD_SE;
00150   if ((present & ROAD_SW) && (GetAnyRoadBits(TILE_ADDXY(tile,  1,  0), rt) & ROAD_NE)) n |= ROAD_SW;
00151   if ((present & ROAD_NW) && (GetAnyRoadBits(TILE_ADDXY(tile,  0, -1), rt) & ROAD_SE)) n |= ROAD_NW;
00152 
00153   int rating_decrease = RATING_ROAD_DOWN_STEP_EDGE;
00154   /* If 0 or 1 bits are set in n, or if no bits that match the bits to remove,
00155    * then allow it */
00156   if (KillFirstBit(n) != ROAD_NONE && (n & remove) != ROAD_NONE) {
00157     /* you can remove all kind of roads with extra dynamite */
00158     if (!_settings_game.construction.extra_dynamite) {
00159       SetDParam(0, t->index);
00160       return_cmd_error(STR_ERROR_LOCAL_AUTHORITY_REFUSES_TO_ALLOW_THIS);
00161     }
00162     rating_decrease = RATING_ROAD_DOWN_STEP_INNER;
00163   }
00164   ChangeTownRating(t, rating_decrease, RATING_ROAD_MINIMUM, flags);
00165 
00166   return CommandCost();
00167 }
00168 
00169 
00179 static CommandCost RemoveRoad(TileIndex tile, DoCommandFlag flags, RoadBits pieces, RoadType rt, bool crossing_check, bool town_check = true)
00180 {
00181   RoadTypes rts = GetRoadTypes(tile);
00182   /* The tile doesn't have the given road type */
00183   if (!HasBit(rts, rt)) return_cmd_error(rt == ROADTYPE_TRAM ? STR_ERROR_THERE_IS_NO_TRAMWAY : STR_ERROR_THERE_IS_NO_ROAD);
00184 
00185   switch (GetTileType(tile)) {
00186     case MP_ROAD: {
00187       CommandCost ret = EnsureNoVehicleOnGround(tile);
00188       if (ret.Failed()) return ret;
00189       break;
00190     }
00191 
00192     case MP_STATION: {
00193       if (!IsDriveThroughStopTile(tile)) return CMD_ERROR;
00194 
00195       CommandCost ret = EnsureNoVehicleOnGround(tile);
00196       if (ret.Failed()) return ret;
00197       break;
00198     }
00199 
00200     case MP_TUNNELBRIDGE: {
00201       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) return CMD_ERROR;
00202       CommandCost ret = TunnelBridgeIsFree(tile, GetOtherTunnelBridgeEnd(tile));
00203       if (ret.Failed()) return ret;
00204       break;
00205     }
00206 
00207     default:
00208       return CMD_ERROR;
00209   }
00210 
00211   CommandCost ret = CheckAllowRemoveRoad(tile, pieces, GetRoadOwner(tile, rt), rt, flags, town_check);
00212   if (ret.Failed()) return ret;
00213 
00214   if (!IsTileType(tile, MP_ROAD)) {
00215     /* If it's the last roadtype, just clear the whole tile */
00216     if (rts == RoadTypeToRoadTypes(rt)) return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00217 
00218     CommandCost cost(EXPENSES_CONSTRUCTION);
00219     if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00220       TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
00221       /* Pay for *every* tile of the bridge or tunnel */
00222       uint len = GetTunnelBridgeLength(other_end, tile) + 2;
00223       cost.AddCost(len * _price[PR_CLEAR_ROAD]);
00224       if (flags & DC_EXEC) {
00225         Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
00226         if (c != NULL) {
00227           /* A full diagonal road tile has two road bits. */
00228           c->infrastructure.road[rt] -= len * 2 * TUNNELBRIDGE_TRACKBIT_FACTOR;
00229           DirtyCompanyInfrastructureWindows(c->index);
00230         }
00231 
00232         SetRoadTypes(other_end, GetRoadTypes(other_end) & ~RoadTypeToRoadTypes(rt));
00233         SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
00234 
00235         /* If the owner of the bridge sells all its road, also move the ownership
00236          * to the owner of the other roadtype. */
00237         RoadType other_rt = (rt == ROADTYPE_ROAD) ? ROADTYPE_TRAM : ROADTYPE_ROAD;
00238         Owner other_owner = GetRoadOwner(tile, other_rt);
00239         if (other_owner != GetTileOwner(tile)) {
00240           SetTileOwner(tile, other_owner);
00241           SetTileOwner(other_end, other_owner);
00242         }
00243 
00244         /* Mark tiles dirty that have been repaved */
00245         MarkTileDirtyByTile(tile);
00246         MarkTileDirtyByTile(other_end);
00247         if (IsBridge(tile)) {
00248           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
00249 
00250           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
00251         }
00252       }
00253     } else {
00254       assert(IsDriveThroughStopTile(tile));
00255       cost.AddCost(_price[PR_CLEAR_ROAD] * 2);
00256       if (flags & DC_EXEC) {
00257         Company *c = Company::GetIfValid(GetTileOwner(tile));
00258         if (c != NULL) {
00259           /* A full diagonal road tile has two road bits. */
00260           c->infrastructure.road[rt] -= 2;
00261           DirtyCompanyInfrastructureWindows(c->index);
00262         }
00263         SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
00264         MarkTileDirtyByTile(tile);
00265       }
00266     }
00267     return cost;
00268   }
00269 
00270   switch (GetRoadTileType(tile)) {
00271     case ROAD_TILE_NORMAL: {
00272       Slope tileh = GetTileSlope(tile);
00273 
00274       /* Steep slopes behave the same as slopes with one corner raised. */
00275       if (IsSteepSlope(tileh)) {
00276         tileh = SlopeWithOneCornerRaised(GetHighestSlopeCorner(tileh));
00277       }
00278 
00279       RoadBits present = GetRoadBits(tile, rt);
00280       const RoadBits other = GetOtherRoadBits(tile, rt);
00281       const Foundation f = GetRoadFoundation(tileh, present);
00282 
00283       if (HasRoadWorks(tile) && _current_company != OWNER_WATER) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00284 
00285       /* Autocomplete to a straight road
00286        * @li if the bits of the other roadtypes result in another foundation
00287        * @li if build on slopes is disabled */
00288       if ((IsStraightRoad(other) && (other & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) != ROAD_NONE) ||
00289           (tileh != SLOPE_FLAT && !_settings_game.construction.build_on_slopes)) {
00290         pieces |= MirrorRoadBits(pieces);
00291       }
00292 
00293       /* limit the bits to delete to the existing bits. */
00294       pieces &= present;
00295       if (pieces == ROAD_NONE) return_cmd_error(rt == ROADTYPE_TRAM ? STR_ERROR_THERE_IS_NO_TRAMWAY : STR_ERROR_THERE_IS_NO_ROAD);
00296 
00297       /* Now set present what it will be after the remove */
00298       present ^= pieces;
00299 
00300       /* Check for invalid RoadBit combinations on slopes */
00301       if (tileh != SLOPE_FLAT && present != ROAD_NONE &&
00302           (present & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) == present) {
00303         return CMD_ERROR;
00304       }
00305 
00306       if (flags & DC_EXEC) {
00307         if (HasRoadWorks(tile)) {
00308           /* flooding tile with road works, don't forget to remove the effect vehicle too */
00309           assert(_current_company == OWNER_WATER);
00310           EffectVehicle *v;
00311           FOR_ALL_EFFECTVEHICLES(v) {
00312             if (TileVirtXY(v->x_pos, v->y_pos) == tile) {
00313               delete v;
00314             }
00315           }
00316         }
00317 
00318         Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
00319         if (c != NULL) {
00320           c->infrastructure.road[rt] -= CountBits(pieces);
00321           DirtyCompanyInfrastructureWindows(c->index);
00322         }
00323 
00324         if (present == ROAD_NONE) {
00325           RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));
00326           if (rts == ROADTYPES_NONE) {
00327             /* Includes MarkTileDirtyByTile() */
00328             DoClearSquare(tile);
00329           } else {
00330             if (rt == ROADTYPE_ROAD && IsRoadOwner(tile, ROADTYPE_ROAD, OWNER_TOWN)) {
00331               /* Update nearest-town index */
00332               const Town *town = CalcClosestTownFromTile(tile);
00333               SetTownIndex(tile, town == NULL ? (TownID)INVALID_TOWN : town->index);
00334             }
00335             SetRoadBits(tile, ROAD_NONE, rt);
00336             SetRoadTypes(tile, rts);
00337             MarkTileDirtyByTile(tile);
00338           }
00339         } else {
00340           /* When bits are removed, you *always* end up with something that
00341            * is not a complete straight road tile. However, trams do not have
00342            * onewayness, so they cannot remove it either. */
00343           if (rt != ROADTYPE_TRAM) SetDisallowedRoadDirections(tile, DRD_NONE);
00344           SetRoadBits(tile, present, rt);
00345           MarkTileDirtyByTile(tile);
00346         }
00347       }
00348 
00349       CommandCost cost(EXPENSES_CONSTRUCTION, CountBits(pieces) * _price[PR_CLEAR_ROAD]);
00350       /* If we build a foundation we have to pay for it. */
00351       if (f == FOUNDATION_NONE && GetRoadFoundation(tileh, present) != FOUNDATION_NONE) cost.AddCost(_price[PR_BUILD_FOUNDATION]);
00352 
00353       return cost;
00354     }
00355 
00356     case ROAD_TILE_CROSSING: {
00357       if (pieces & ComplementRoadBits(GetCrossingRoadBits(tile))) {
00358         return CMD_ERROR;
00359       }
00360 
00361       /* Don't allow road to be removed from the crossing when there is tram;
00362        * we can't draw the crossing without roadbits ;) */
00363       if (rt == ROADTYPE_ROAD && HasTileRoadType(tile, ROADTYPE_TRAM) && (flags & DC_EXEC || crossing_check)) return CMD_ERROR;
00364 
00365       if (flags & DC_EXEC) {
00366         Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
00367         if (c != NULL) {
00368           /* A full diagonal road tile has two road bits. */
00369           c->infrastructure.road[rt] -= 2;
00370           DirtyCompanyInfrastructureWindows(c->index);
00371         }
00372 
00373         Track railtrack = GetCrossingRailTrack(tile);
00374         RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));
00375         if (rts == ROADTYPES_NONE) {
00376           TrackBits tracks = GetCrossingRailBits(tile);
00377           bool reserved = HasCrossingReservation(tile);
00378           MakeRailNormal(tile, GetTileOwner(tile), tracks, GetRailType(tile));
00379           if (reserved) SetTrackReservation(tile, tracks);
00380         } else {
00381           SetRoadTypes(tile, rts);
00382           /* If we ever get HWAY and it is possible without road then we will need to promote ownership and invalidate town index here, too */
00383         }
00384         MarkTileDirtyByTile(tile);
00385         YapfNotifyTrackLayoutChange(tile, railtrack);
00386       }
00387       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_ROAD] * 2);
00388     }
00389 
00390     default:
00391     case ROAD_TILE_DEPOT:
00392       return CMD_ERROR;
00393   }
00394 }
00395 
00396 
00408 static CommandCost CheckRoadSlope(Slope tileh, RoadBits *pieces, RoadBits existing, RoadBits other)
00409 {
00410   /* Remove already build pieces */
00411   CLRBITS(*pieces, existing);
00412 
00413   /* If we can't build anything stop here */
00414   if (*pieces == ROAD_NONE) return CMD_ERROR;
00415 
00416   /* All RoadBit combos are valid on flat land */
00417   if (tileh == SLOPE_FLAT) return CommandCost();
00418 
00419   /* Steep slopes behave the same as slopes with one corner raised. */
00420   if (IsSteepSlope(tileh)) {
00421     tileh = SlopeWithOneCornerRaised(GetHighestSlopeCorner(tileh));
00422   }
00423 
00424   /* Save the merge of all bits of the current type */
00425   RoadBits type_bits = existing | *pieces;
00426 
00427   /* Roads on slopes */
00428   if (_settings_game.construction.build_on_slopes && (_invalid_tileh_slopes_road[0][tileh] & (other | type_bits)) == ROAD_NONE) {
00429 
00430     /* If we add leveling we've got to pay for it */
00431     if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00432 
00433     return CommandCost();
00434   }
00435 
00436   /* Autocomplete uphill roads */
00437   *pieces |= MirrorRoadBits(*pieces);
00438   type_bits = existing | *pieces;
00439 
00440   /* Uphill roads */
00441   if (IsStraightRoad(type_bits) && (other == type_bits || other == ROAD_NONE) &&
00442       (_invalid_tileh_slopes_road[1][tileh] & (other | type_bits)) == ROAD_NONE) {
00443 
00444     /* Slopes with foundation ? */
00445     if (IsSlopeWithOneCornerRaised(tileh)) {
00446 
00447       /* Prevent build on slopes if it isn't allowed */
00448       if (_settings_game.construction.build_on_slopes) {
00449 
00450         /* If we add foundation we've got to pay for it */
00451         if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00452 
00453         return CommandCost();
00454       }
00455     } else {
00456       if (HasExactlyOneBit(existing) && GetRoadFoundation(tileh, existing) == FOUNDATION_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00457       return CommandCost();
00458     }
00459   }
00460   return CMD_ERROR;
00461 }
00462 
00474 CommandCost CmdBuildRoad(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00475 {
00476   CommandCost cost(EXPENSES_CONSTRUCTION);
00477 
00478   RoadBits existing = ROAD_NONE;
00479   RoadBits other_bits = ROAD_NONE;
00480 
00481   /* Road pieces are max 4 bitset values (NE, NW, SE, SW) and town can only be non-zero
00482    * if a non-company is building the road */
00483   if ((Company::IsValidID(_current_company) && p2 != 0) || (_current_company == OWNER_TOWN && !Town::IsValidID(p2))) return CMD_ERROR;
00484   if (_current_company != OWNER_TOWN) {
00485     const Town *town = CalcClosestTownFromTile(tile);
00486     p2 = (town != NULL) ? town->index : (TownID)INVALID_TOWN;
00487   }
00488 
00489   RoadBits pieces = Extract<RoadBits, 0, 4>(p1);
00490 
00491   /* do not allow building 'zero' road bits, code wouldn't handle it */
00492   if (pieces == ROAD_NONE) return CMD_ERROR;
00493 
00494   RoadType rt = Extract<RoadType, 4, 2>(p1);
00495   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00496 
00497   DisallowedRoadDirections toggle_drd = Extract<DisallowedRoadDirections, 6, 2>(p1);
00498 
00499   Slope tileh = GetTileSlope(tile);
00500 
00501   bool need_to_clear = false;
00502   switch (GetTileType(tile)) {
00503     case MP_ROAD:
00504       switch (GetRoadTileType(tile)) {
00505         case ROAD_TILE_NORMAL: {
00506           if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00507 
00508           other_bits = GetOtherRoadBits(tile, rt);
00509           if (!HasTileRoadType(tile, rt)) break;
00510 
00511           existing = GetRoadBits(tile, rt);
00512           bool crossing = !IsStraightRoad(existing | pieces);
00513           if (rt != ROADTYPE_TRAM && (GetDisallowedRoadDirections(tile) != DRD_NONE || toggle_drd != DRD_NONE) && crossing) {
00514             /* Junctions cannot be one-way */
00515             return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
00516           }
00517           if ((existing & pieces) == pieces) {
00518             /* We only want to set the (dis)allowed road directions */
00519             if (toggle_drd != DRD_NONE && rt != ROADTYPE_TRAM) {
00520               if (crossing) return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
00521 
00522               Owner owner = GetRoadOwner(tile, ROADTYPE_ROAD);
00523               if (owner != OWNER_NONE) {
00524                 CommandCost ret = CheckOwnership(owner, tile);
00525                 if (ret.Failed()) return ret;
00526               }
00527 
00528               DisallowedRoadDirections dis_existing = GetDisallowedRoadDirections(tile);
00529               DisallowedRoadDirections dis_new      = dis_existing ^ toggle_drd;
00530 
00531               /* We allow removing disallowed directions to break up
00532                * deadlocks, but adding them can break articulated
00533                * vehicles. As such, only when less is disallowed,
00534                * i.e. bits are removed, we skip the vehicle check. */
00535               if (CountBits(dis_existing) <= CountBits(dis_new)) {
00536                 CommandCost ret = EnsureNoVehicleOnGround(tile);
00537                 if (ret.Failed()) return ret;
00538               }
00539 
00540               /* Ignore half built tiles */
00541               if ((flags & DC_EXEC) && rt != ROADTYPE_TRAM && IsStraightRoad(existing)) {
00542                 SetDisallowedRoadDirections(tile, dis_new);
00543                 MarkTileDirtyByTile(tile);
00544               }
00545               return CommandCost();
00546             }
00547             return_cmd_error(STR_ERROR_ALREADY_BUILT);
00548           }
00549           break;
00550         }
00551 
00552         case ROAD_TILE_CROSSING:
00553           other_bits = GetCrossingRoadBits(tile);
00554           if (pieces & ComplementRoadBits(other_bits)) goto do_clear;
00555           pieces = other_bits; // we need to pay for both roadbits
00556 
00557           if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00558           break;
00559 
00560         case ROAD_TILE_DEPOT:
00561           if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00562           goto do_clear;
00563 
00564         default: NOT_REACHED();
00565       }
00566       break;
00567 
00568     case MP_RAILWAY: {
00569       if (IsSteepSlope(tileh)) {
00570         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00571       }
00572 
00573       /* Level crossings may only be built on these slopes */
00574       if (!HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh)) {
00575         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00576       }
00577 
00578       if (GetRailTileType(tile) != RAIL_TILE_NORMAL) goto do_clear;
00579 
00580       if (RailNoLevelCrossings(GetRailType(tile))) {
00581         return_cmd_error(STR_ERROR_CROSSING_DISALLOWED);
00582       }
00583 
00584       Axis roaddir;
00585       switch (GetTrackBits(tile)) {
00586         case TRACK_BIT_X:
00587           if (pieces & ROAD_X) goto do_clear;
00588           roaddir = AXIS_Y;
00589           break;
00590 
00591         case TRACK_BIT_Y:
00592           if (pieces & ROAD_Y) goto do_clear;
00593           roaddir = AXIS_X;
00594           break;
00595 
00596         default: goto do_clear;
00597       }
00598 
00599       CommandCost ret = EnsureNoVehicleOnGround(tile);
00600       if (ret.Failed()) return ret;
00601 
00602       if (flags & DC_EXEC) {
00603         Track railtrack = AxisToTrack(OtherAxis(roaddir));
00604         YapfNotifyTrackLayoutChange(tile, railtrack);
00605         /* Update company infrastructure counts. A level crossing has two road bits. */
00606         Company *c = Company::GetIfValid(_current_company);
00607         if (c != NULL) {
00608           c->infrastructure.road[rt] += 2;
00609           if (rt != ROADTYPE_ROAD) c->infrastructure.road[ROADTYPE_ROAD] += 2;
00610           DirtyCompanyInfrastructureWindows(_current_company);
00611         }
00612         /* Always add road to the roadtypes (can't draw without it) */
00613         bool reserved = HasBit(GetRailReservationTrackBits(tile), railtrack);
00614         MakeRoadCrossing(tile, _current_company, _current_company, GetTileOwner(tile), roaddir, GetRailType(tile), RoadTypeToRoadTypes(rt) | ROADTYPES_ROAD, p2);
00615         SetCrossingReservation(tile, reserved);
00616         UpdateLevelCrossing(tile, false);
00617         MarkTileDirtyByTile(tile);
00618       }
00619       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_ROAD] * (rt == ROADTYPE_ROAD ? 2 : 4));
00620     }
00621 
00622     case MP_STATION: {
00623       if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00624       if (!IsDriveThroughStopTile(tile)) goto do_clear;
00625 
00626       RoadBits curbits = AxisToRoadBits(DiagDirToAxis(GetRoadStopDir(tile)));
00627       if (pieces & ~curbits) goto do_clear;
00628       pieces = curbits; // we need to pay for both roadbits
00629 
00630       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00631       break;
00632     }
00633 
00634     case MP_TUNNELBRIDGE: {
00635       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) goto do_clear;
00636       if (MirrorRoadBits(DiagDirToRoadBits(GetTunnelBridgeDirection(tile))) != pieces) goto do_clear;
00637       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00638       /* Don't allow adding roadtype to the bridge/tunnel when vehicles are already driving on it */
00639       CommandCost ret = TunnelBridgeIsFree(tile, GetOtherTunnelBridgeEnd(tile));
00640       if (ret.Failed()) return ret;
00641       break;
00642     }
00643 
00644     default: {
00645 do_clear:;
00646       need_to_clear = true;
00647       break;
00648     }
00649   }
00650 
00651   if (need_to_clear) {
00652     CommandCost ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00653     if (ret.Failed()) return ret;
00654     cost.AddCost(ret);
00655   }
00656 
00657   if (other_bits != pieces) {
00658     /* Check the foundation/slopes when adding road/tram bits */
00659     CommandCost ret = CheckRoadSlope(tileh, &pieces, existing, other_bits);
00660     /* Return an error if we need to build a foundation (ret != 0) but the
00661      * current setting is turned off */
00662     if (ret.Failed() || (ret.GetCost() != 0 && !_settings_game.construction.build_on_slopes)) {
00663       return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00664     }
00665     cost.AddCost(ret);
00666   }
00667 
00668   if (!need_to_clear) {
00669     if (IsTileType(tile, MP_ROAD)) {
00670       /* Don't put the pieces that already exist */
00671       pieces &= ComplementRoadBits(existing);
00672 
00673       /* Check if new road bits will have the same foundation as other existing road types */
00674       if (IsNormalRoad(tile)) {
00675         Slope slope = GetTileSlope(tile);
00676         Foundation found_new = GetRoadFoundation(slope, pieces | existing);
00677 
00678         /* Test if all other roadtypes can be built at that foundation */
00679         for (RoadType rtest = ROADTYPE_ROAD; rtest < ROADTYPE_END; rtest++) {
00680           if (rtest != rt) { // check only other road types
00681             RoadBits bits = GetRoadBits(tile, rtest);
00682             /* do not check if there are not road bits of given type */
00683             if (bits != ROAD_NONE && GetRoadFoundation(slope, bits) != found_new) {
00684               return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00685             }
00686           }
00687         }
00688       }
00689     }
00690 
00691     CommandCost ret = EnsureNoVehicleOnGround(tile);
00692     if (ret.Failed()) return ret;
00693 
00694   }
00695 
00696   uint num_pieces = (!need_to_clear && IsTileType(tile, MP_TUNNELBRIDGE)) ?
00697       /* There are 2 pieces on *every* tile of the bridge or tunnel */
00698       2 * (GetTunnelBridgeLength(GetOtherTunnelBridgeEnd(tile), tile) + 2) :
00699       /* Count pieces */
00700       CountBits(pieces);
00701 
00702   cost.AddCost(num_pieces * _price[PR_BUILD_ROAD]);
00703 
00704   if (flags & DC_EXEC) {
00705     switch (GetTileType(tile)) {
00706       case MP_ROAD: {
00707         RoadTileType rtt = GetRoadTileType(tile);
00708         if (existing == ROAD_NONE || rtt == ROAD_TILE_CROSSING) {
00709           SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00710           SetRoadOwner(tile, rt, _current_company);
00711           if (rt == ROADTYPE_ROAD) SetTownIndex(tile, p2);
00712         }
00713         if (rtt != ROAD_TILE_CROSSING) SetRoadBits(tile, existing | pieces, rt);
00714         break;
00715       }
00716 
00717       case MP_TUNNELBRIDGE: {
00718         TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
00719 
00720         SetRoadTypes(other_end, GetRoadTypes(other_end) | RoadTypeToRoadTypes(rt));
00721         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00722         SetRoadOwner(other_end, rt, _current_company);
00723         SetRoadOwner(tile, rt, _current_company);
00724 
00725         /* Mark tiles dirty that have been repaved */
00726         MarkTileDirtyByTile(other_end);
00727         MarkTileDirtyByTile(tile);
00728         if (IsBridge(tile)) {
00729           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
00730 
00731           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
00732         }
00733         break;
00734       }
00735 
00736       case MP_STATION:
00737         assert(IsDriveThroughStopTile(tile));
00738         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00739         SetRoadOwner(tile, rt, _current_company);
00740         break;
00741 
00742       default:
00743         MakeRoadNormal(tile, pieces, RoadTypeToRoadTypes(rt), p2, _current_company, _current_company);
00744         break;
00745     }
00746 
00747     /* Update company infrastructure count. */
00748     Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
00749     if (c != NULL) {
00750       if (IsTileType(tile, MP_TUNNELBRIDGE)) num_pieces *= TUNNELBRIDGE_TRACKBIT_FACTOR;
00751       c->infrastructure.road[rt] += num_pieces;
00752       DirtyCompanyInfrastructureWindows(c->index);
00753     }
00754 
00755     if (rt != ROADTYPE_TRAM && IsNormalRoadTile(tile)) {
00756       existing |= pieces;
00757       SetDisallowedRoadDirections(tile, IsStraightRoad(existing) ?
00758           GetDisallowedRoadDirections(tile) ^ toggle_drd : DRD_NONE);
00759     }
00760 
00761     MarkTileDirtyByTile(tile);
00762   }
00763   return cost;
00764 }
00765 
00781 CommandCost CmdBuildLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00782 {
00783   DisallowedRoadDirections drd = DRD_NORTHBOUND;
00784 
00785   if (p1 >= MapSize()) return CMD_ERROR;
00786 
00787   TileIndex end_tile = p1;
00788   RoadType rt = Extract<RoadType, 3, 2>(p2);
00789   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00790 
00791   Axis axis = Extract<Axis, 2, 1>(p2);
00792   /* Only drag in X or Y direction dictated by the direction variable */
00793   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00794   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00795 
00796   DiagDirection dir = AxisToDiagDir(axis);
00797 
00798   /* Swap direction, also the half-tile drag var (bit 0 and 1) */
00799   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00800     dir = ReverseDiagDir(dir);
00801     p2 ^= 3;
00802     drd = DRD_SOUTHBOUND;
00803   }
00804 
00805   /* On the X-axis, we have to swap the initial bits, so they
00806    * will be interpreted correctly in the GTTS. Furthermore
00807    * when you just 'click' on one tile to build them. */
00808   if ((axis == AXIS_Y) == (start_tile == end_tile && HasBit(p2, 0) == HasBit(p2, 1))) drd ^= DRD_BOTH;
00809   /* No disallowed direction bits have to be toggled */
00810   if (!HasBit(p2, 5)) drd = DRD_NONE;
00811 
00812   CommandCost cost(EXPENSES_CONSTRUCTION);
00813   CommandCost last_error = CMD_ERROR;
00814   TileIndex tile = start_tile;
00815   bool had_bridge = false;
00816   bool had_tunnel = false;
00817   bool had_success = false;
00818   /* Start tile is the first tile clicked by the user. */
00819   for (;;) {
00820     RoadBits bits = AxisToRoadBits(axis);
00821 
00822     /* Road parts only have to be built at the start tile or at the end tile. */
00823     if (tile == end_tile && !HasBit(p2, 1)) bits &= DiagDirToRoadBits(ReverseDiagDir(dir));
00824     if (tile == start_tile && HasBit(p2, 0)) bits &= DiagDirToRoadBits(dir);
00825 
00826     CommandCost ret = DoCommand(tile, drd << 6 | rt << 4 | bits, 0, flags, CMD_BUILD_ROAD);
00827     if (ret.Failed()) {
00828       last_error = ret;
00829       if (last_error.GetErrorMessage() != STR_ERROR_ALREADY_BUILT) {
00830         if (HasBit(p2, 6)) return last_error;
00831         break;
00832       }
00833     } else {
00834       had_success = true;
00835       /* Only pay for the upgrade on one side of the bridges and tunnels */
00836       if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00837         if (IsBridge(tile)) {
00838           if (!had_bridge || GetTunnelBridgeDirection(tile) == dir) {
00839             cost.AddCost(ret);
00840           }
00841           had_bridge = true;
00842         } else { // IsTunnel(tile)
00843           if (!had_tunnel || GetTunnelBridgeDirection(tile) == dir) {
00844             cost.AddCost(ret);
00845           }
00846           had_tunnel = true;
00847         }
00848       } else {
00849         cost.AddCost(ret);
00850       }
00851     }
00852 
00853     if (tile == end_tile) break;
00854 
00855     tile += TileOffsByDiagDir(dir);
00856   }
00857 
00858   return had_success ? cost : last_error;
00859 }
00860 
00874 CommandCost CmdRemoveLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00875 {
00876   CommandCost cost(EXPENSES_CONSTRUCTION);
00877 
00878   if (p1 >= MapSize()) return CMD_ERROR;
00879 
00880   TileIndex end_tile = p1;
00881   RoadType rt = Extract<RoadType, 3, 2>(p2);
00882   if (!IsValidRoadType(rt)) return CMD_ERROR;
00883 
00884   Axis axis = Extract<Axis, 2, 1>(p2);
00885   /* Only drag in X or Y direction dictated by the direction variable */
00886   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00887   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00888 
00889   /* Swap start and ending tile, also the half-tile drag var (bit 0 and 1) */
00890   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00891     TileIndex t = start_tile;
00892     start_tile = end_tile;
00893     end_tile = t;
00894     p2 ^= IsInsideMM(p2 & 3, 1, 3) ? 3 : 0;
00895   }
00896 
00897   Money money = GetAvailableMoneyForCommand();
00898   TileIndex tile = start_tile;
00899   CommandCost last_error = CMD_ERROR;
00900   bool had_success = false;
00901   /* Start tile is the small number. */
00902   for (;;) {
00903     RoadBits bits = AxisToRoadBits(axis);
00904 
00905     if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
00906     if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
00907 
00908     /* try to remove the halves. */
00909     if (bits != 0) {
00910       CommandCost ret = RemoveRoad(tile, flags & ~DC_EXEC, bits, rt, true);
00911       if (ret.Succeeded()) {
00912         if (flags & DC_EXEC) {
00913           money -= ret.GetCost();
00914           if (money < 0) {
00915             _additional_cash_required = DoCommand(start_tile, end_tile, p2, flags & ~DC_EXEC, CMD_REMOVE_LONG_ROAD).GetCost();
00916             return cost;
00917           }
00918           RemoveRoad(tile, flags, bits, rt, true, false);
00919         }
00920         cost.AddCost(ret);
00921         had_success = true;
00922       } else {
00923         /* Ownership errors are more important. */
00924         if (last_error.GetErrorMessage() != STR_ERROR_OWNED_BY) last_error = ret;
00925       }
00926     }
00927 
00928     if (tile == end_tile) break;
00929 
00930     tile += (axis == AXIS_Y) ? TileDiffXY(0, 1) : TileDiffXY(1, 0);
00931   }
00932 
00933   return had_success ? cost : last_error;
00934 }
00935 
00949 CommandCost CmdBuildRoadDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00950 {
00951   DiagDirection dir = Extract<DiagDirection, 0, 2>(p1);
00952   RoadType rt = Extract<RoadType, 2, 2>(p1);
00953 
00954   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00955 
00956   Slope tileh = GetTileSlope(tile);
00957   if (tileh != SLOPE_FLAT && (
00958         !_settings_game.construction.build_on_slopes ||
00959         !CanBuildDepotByTileh(dir, tileh)
00960       )) {
00961     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00962   }
00963 
00964   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00965   if (cost.Failed()) return cost;
00966 
00967   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
00968 
00969   if (!Depot::CanAllocateItem()) return CMD_ERROR;
00970 
00971   if (flags & DC_EXEC) {
00972     Depot *dep = new Depot(tile);
00973     dep->build_date = _date;
00974 
00975     /* A road depot has two road bits. */
00976     Company::Get(_current_company)->infrastructure.road[rt] += 2;
00977     DirtyCompanyInfrastructureWindows(_current_company);
00978 
00979     MakeRoadDepot(tile, _current_company, dep->index, dir, rt);
00980     MarkTileDirtyByTile(tile);
00981     MakeDefaultName(dep);
00982   }
00983   cost.AddCost(_price[PR_BUILD_DEPOT_ROAD]);
00984   return cost;
00985 }
00986 
00987 static CommandCost RemoveRoadDepot(TileIndex tile, DoCommandFlag flags)
00988 {
00989   if (_current_company != OWNER_WATER) {
00990     CommandCost ret = CheckTileOwnership(tile);
00991     if (ret.Failed()) return ret;
00992   }
00993 
00994   CommandCost ret = EnsureNoVehicleOnGround(tile);
00995   if (ret.Failed()) return ret;
00996 
00997   if (flags & DC_EXEC) {
00998     Company *c = Company::GetIfValid(GetTileOwner(tile));
00999     if (c != NULL) {
01000       /* A road depot has two road bits. */
01001       c->infrastructure.road[FIND_FIRST_BIT(GetRoadTypes(tile))] -= 2;
01002       DirtyCompanyInfrastructureWindows(c->index);
01003     }
01004 
01005     delete Depot::GetByTile(tile);
01006     DoClearSquare(tile);
01007   }
01008 
01009   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_ROAD]);
01010 }
01011 
01012 static CommandCost ClearTile_Road(TileIndex tile, DoCommandFlag flags)
01013 {
01014   switch (GetRoadTileType(tile)) {
01015     case ROAD_TILE_NORMAL: {
01016       RoadBits b = GetAllRoadBits(tile);
01017 
01018       /* Clear the road if only one piece is on the tile OR we are not using the DC_AUTO flag */
01019       if ((HasExactlyOneBit(b) && GetRoadBits(tile, ROADTYPE_TRAM) == ROAD_NONE) || !(flags & DC_AUTO)) {
01020         CommandCost ret(EXPENSES_CONSTRUCTION);
01021         RoadType rt;
01022         FOR_EACH_SET_ROADTYPE(rt, GetRoadTypes(tile)) {
01023           CommandCost tmp_ret = RemoveRoad(tile, flags, GetRoadBits(tile, rt), rt, true);
01024           if (tmp_ret.Failed()) return tmp_ret;
01025           ret.AddCost(tmp_ret);
01026         }
01027         return ret;
01028       }
01029       return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
01030     }
01031 
01032     case ROAD_TILE_CROSSING: {
01033       RoadTypes rts = GetRoadTypes(tile);
01034       CommandCost ret(EXPENSES_CONSTRUCTION);
01035 
01036       if (flags & DC_AUTO) return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
01037 
01038       /* Must iterate over the roadtypes in a reverse manner because
01039        * tram tracks must be removed before the road bits. */
01040       RoadType rt = ROADTYPE_TRAM;
01041       do {
01042         if (HasBit(rts, rt)) {
01043           CommandCost tmp_ret = RemoveRoad(tile, flags, GetCrossingRoadBits(tile), rt, false);
01044           if (tmp_ret.Failed()) return tmp_ret;
01045           ret.AddCost(tmp_ret);
01046         }
01047       } while (rt-- != ROADTYPE_ROAD);
01048 
01049       if (flags & DC_EXEC) {
01050         DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
01051       }
01052       return ret;
01053     }
01054 
01055     default:
01056     case ROAD_TILE_DEPOT:
01057       if (flags & DC_AUTO) {
01058         return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
01059       }
01060       return RemoveRoadDepot(tile, flags);
01061   }
01062 }
01063 
01064 
01065 struct DrawRoadTileStruct {
01066   uint16 image;
01067   byte subcoord_x;
01068   byte subcoord_y;
01069 };
01070 
01071 #include "table/road_land.h"
01072 
01080 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits)
01081 {
01082   /* Flat land and land without a road doesn't require a foundation */
01083   if (tileh == SLOPE_FLAT || bits == ROAD_NONE) return FOUNDATION_NONE;
01084 
01085   /* Steep slopes behave the same as slopes with one corner raised. */
01086   if (IsSteepSlope(tileh)) {
01087     tileh = SlopeWithOneCornerRaised(GetHighestSlopeCorner(tileh));
01088   }
01089 
01090   /* Leveled RoadBits on a slope */
01091   if ((_invalid_tileh_slopes_road[0][tileh] & bits) == ROAD_NONE) return FOUNDATION_LEVELED;
01092 
01093   /* Straight roads without foundation on a slope */
01094   if (!IsSlopeWithOneCornerRaised(tileh) &&
01095       (_invalid_tileh_slopes_road[1][tileh] & bits) == ROAD_NONE)
01096     return FOUNDATION_NONE;
01097 
01098   /* Roads on steep Slopes or on Slopes with one corner raised */
01099   return (bits == ROAD_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
01100 }
01101 
01102 const byte _road_sloped_sprites[14] = {
01103   0,  0,  2,  0,
01104   0,  1,  0,  0,
01105   3,  0,  0,  0,
01106   0,  0
01107 };
01108 
01119 static bool AlwaysDrawUnpavedRoads(TileIndex tile, Roadside roadside)
01120 {
01121   return (IsOnSnow(tile) &&
01122       !(_settings_game.game_creation.landscape == LT_TROPIC && HasGrfMiscBit(GMB_DESERT_PAVED_ROADS) &&
01123         roadside != ROADSIDE_BARREN && roadside != ROADSIDE_GRASS && roadside != ROADSIDE_GRASS_ROAD_WORKS));
01124 }
01125 
01131 void DrawTramCatenary(const TileInfo *ti, RoadBits tram)
01132 {
01133   /* Do not draw catenary if it is invisible */
01134   if (IsInvisibilitySet(TO_CATENARY)) return;
01135 
01136   /* Don't draw the catenary under a low bridge */
01137   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_CATENARY)) {
01138     int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01139 
01140     if (height <= GetTileMaxZ(ti->tile) + 1) return;
01141   }
01142 
01143   SpriteID front;
01144   SpriteID back;
01145 
01146   if (ti->tileh != SLOPE_FLAT) {
01147     back  = SPR_TRAMWAY_BACK_WIRES_SLOPED  + _road_sloped_sprites[ti->tileh - 1];
01148     front = SPR_TRAMWAY_FRONT_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
01149   } else {
01150     back  = SPR_TRAMWAY_BASE + _road_backpole_sprites_1[tram];
01151     front = SPR_TRAMWAY_BASE + _road_frontwire_sprites_1[tram];
01152   }
01153 
01154   AddSortableSpriteToDraw(back,  PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01155   AddSortableSpriteToDraw(front, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01156 }
01157 
01166 static void DrawRoadDetail(SpriteID img, const TileInfo *ti, int dx, int dy, int h)
01167 {
01168   int x = ti->x | dx;
01169   int y = ti->y | dy;
01170   int z = ti->z;
01171   if (ti->tileh != SLOPE_FLAT) z = GetSlopePixelZ(x, y);
01172   AddSortableSpriteToDraw(img, PAL_NONE, x, y, 2, 2, h, z);
01173 }
01174 
01179 static void DrawRoadBits(TileInfo *ti)
01180 {
01181   RoadBits road = GetRoadBits(ti->tile, ROADTYPE_ROAD);
01182   RoadBits tram = GetRoadBits(ti->tile, ROADTYPE_TRAM);
01183 
01184   SpriteID image = 0;
01185   PaletteID pal = PAL_NONE;
01186 
01187   if (ti->tileh != SLOPE_FLAT) {
01188     DrawFoundation(ti, GetRoadFoundation(ti->tileh, road | tram));
01189 
01190     /* DrawFoundation() modifies ti.
01191      * Default sloped sprites.. */
01192     if (ti->tileh != SLOPE_FLAT) image = _road_sloped_sprites[ti->tileh - 1] + SPR_ROAD_SLOPE_START;
01193   }
01194 
01195   if (image == 0) image = _road_tile_sprites_1[road != ROAD_NONE ? road : tram];
01196 
01197   Roadside roadside = GetRoadside(ti->tile);
01198 
01199   if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01200     image += 19;
01201   } else {
01202     switch (roadside) {
01203       case ROADSIDE_BARREN:           pal = PALETTE_TO_BARE_LAND; break;
01204       case ROADSIDE_GRASS:            break;
01205       case ROADSIDE_GRASS_ROAD_WORKS: break;
01206       default:                        image -= 19; break; // Paved
01207     }
01208   }
01209 
01210   DrawGroundSprite(image, pal);
01211 
01212   /* For tram we overlay the road graphics with either tram tracks only
01213    * (when there is actual road beneath the trams) or with tram tracks
01214    * and some dirts which hides the road graphics */
01215   if (tram != ROAD_NONE) {
01216     if (ti->tileh != SLOPE_FLAT) {
01217       image = _road_sloped_sprites[ti->tileh - 1] + SPR_TRAMWAY_SLOPED_OFFSET;
01218     } else {
01219       image = _road_tile_sprites_1[tram] - SPR_ROAD_Y;
01220     }
01221     image += (road == ROAD_NONE) ? SPR_TRAMWAY_TRAM : SPR_TRAMWAY_OVERLAY;
01222     DrawGroundSprite(image, pal);
01223   }
01224 
01225   if (road != ROAD_NONE) {
01226     DisallowedRoadDirections drd = GetDisallowedRoadDirections(ti->tile);
01227     if (drd != DRD_NONE) {
01228       DrawGroundSpriteAt(SPR_ONEWAY_BASE + drd - 1 + ((road == ROAD_X) ? 0 : 3), PAL_NONE, 8, 8, GetPartialPixelZ(8, 8, ti->tileh));
01229     }
01230   }
01231 
01232   if (HasRoadWorks(ti->tile)) {
01233     /* Road works */
01234     DrawGroundSprite((road | tram) & ROAD_X ? SPR_EXCAVATION_X : SPR_EXCAVATION_Y, PAL_NONE);
01235     return;
01236   }
01237 
01238   if (tram != ROAD_NONE) DrawTramCatenary(ti, tram);
01239 
01240   /* Return if full detail is disabled, or we are zoomed fully out. */
01241   if (!HasBit(_display_opt, DO_FULL_DETAIL) || _cur_dpi->zoom > ZOOM_LVL_DETAIL) return;
01242 
01243   /* Do not draw details (street lights, trees) under low bridge */
01244   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && (roadside == ROADSIDE_TREES || roadside == ROADSIDE_STREET_LIGHTS)) {
01245     int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01246     int minz = GetTileMaxZ(ti->tile) + 2;
01247 
01248     if (roadside == ROADSIDE_TREES) minz++;
01249 
01250     if (height < minz) return;
01251   }
01252 
01253   /* If there are no road bits, return, as there is nothing left to do */
01254   if (HasAtMostOneBit(road)) return;
01255 
01256   /* Draw extra details. */
01257   for (const DrawRoadTileStruct *drts = _road_display_table[roadside][road | tram]; drts->image != 0; drts++) {
01258     DrawRoadDetail(drts->image, ti, drts->subcoord_x, drts->subcoord_y, 0x10);
01259   }
01260 }
01261 
01263 static void DrawTile_Road(TileInfo *ti)
01264 {
01265   switch (GetRoadTileType(ti->tile)) {
01266     case ROAD_TILE_NORMAL:
01267       DrawRoadBits(ti);
01268       break;
01269 
01270     case ROAD_TILE_CROSSING: {
01271       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01272 
01273       PaletteID pal = PAL_NONE;
01274       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
01275 
01276       if (rti->UsesOverlay()) {
01277         Axis axis = GetCrossingRailAxis(ti->tile);
01278         SpriteID road = SPR_ROAD_Y + axis;
01279 
01280         Roadside roadside = GetRoadside(ti->tile);
01281 
01282         if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01283           road += 19;
01284         } else {
01285           switch (roadside) {
01286             case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
01287             case ROADSIDE_GRASS:  break;
01288             default:              road -= 19; break; // Paved
01289           }
01290         }
01291 
01292         DrawGroundSprite(road, pal);
01293 
01294         SpriteID rail = GetCustomRailSprite(rti, ti->tile, RTSG_CROSSING) + axis;
01295         /* Draw tracks, but draw PBS reserved tracks darker. */
01296         pal = (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) ? PALETTE_CRASH : PAL_NONE;
01297         DrawGroundSprite(rail, pal);
01298 
01299         DrawRailTileSeq(ti, &_crossing_layout, TO_CATENARY, rail, 0, PAL_NONE);
01300       } else {
01301         SpriteID image = rti->base_sprites.crossing;
01302 
01303         if (GetCrossingRoadAxis(ti->tile) == AXIS_X) image++;
01304         if (IsCrossingBarred(ti->tile)) image += 2;
01305 
01306         Roadside roadside = GetRoadside(ti->tile);
01307 
01308         if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01309           image += 8;
01310         } else {
01311           switch (roadside) {
01312             case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
01313             case ROADSIDE_GRASS:  break;
01314             default:              image += 4; break; // Paved
01315           }
01316         }
01317 
01318         DrawGroundSprite(image, pal);
01319 
01320         /* PBS debugging, draw reserved tracks darker */
01321         if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) {
01322           DrawGroundSprite(GetCrossingRoadAxis(ti->tile) == AXIS_Y ? GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_x : GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_y, PALETTE_CRASH);
01323         }
01324       }
01325 
01326       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01327         DrawGroundSprite(SPR_TRAMWAY_OVERLAY + (GetCrossingRoadAxis(ti->tile) ^ 1), pal);
01328         DrawTramCatenary(ti, GetCrossingRoadBits(ti->tile));
01329       }
01330       if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01331       break;
01332     }
01333 
01334     default:
01335     case ROAD_TILE_DEPOT: {
01336       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01337 
01338       PaletteID palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
01339 
01340       const DrawTileSprites *dts;
01341       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01342         dts =  &_tram_depot[GetRoadDepotDirection(ti->tile)];
01343       } else {
01344         dts =  &_road_depot[GetRoadDepotDirection(ti->tile)];
01345       }
01346 
01347       DrawGroundSprite(dts->ground.sprite, PAL_NONE);
01348       DrawOrigTileSeq(ti, dts, TO_BUILDINGS, palette);
01349       break;
01350     }
01351   }
01352   DrawBridgeMiddle(ti);
01353 }
01354 
01362 void DrawRoadDepotSprite(int x, int y, DiagDirection dir, RoadType rt)
01363 {
01364   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
01365   const DrawTileSprites *dts = (rt == ROADTYPE_TRAM) ? &_tram_depot[dir] : &_road_depot[dir];
01366 
01367   x += 33;
01368   y += 17;
01369 
01370   DrawSprite(dts->ground.sprite, PAL_NONE, x, y);
01371   DrawOrigTileSeqInGUI(x, y, dts, palette);
01372 }
01373 
01379 void UpdateNearestTownForRoadTiles(bool invalidate)
01380 {
01381   assert(!invalidate || _generating_world);
01382 
01383   for (TileIndex t = 0; t < MapSize(); t++) {
01384     if (IsTileType(t, MP_ROAD) && !IsRoadDepot(t) && !HasTownOwnedRoad(t)) {
01385       TownID tid = (TownID)INVALID_TOWN;
01386       if (!invalidate) {
01387         const Town *town = CalcClosestTownFromTile(t);
01388         if (town != NULL) tid = town->index;
01389       }
01390       SetTownIndex(t, tid);
01391     }
01392   }
01393 }
01394 
01395 static int GetSlopePixelZ_Road(TileIndex tile, uint x, uint y)
01396 {
01397 
01398   if (IsNormalRoad(tile)) {
01399     int z;
01400     Slope tileh = GetTilePixelSlope(tile, &z);
01401     if (tileh == SLOPE_FLAT) return z;
01402 
01403     Foundation f = GetRoadFoundation(tileh, GetAllRoadBits(tile));
01404     z += ApplyPixelFoundationToSlope(f, &tileh);
01405     return z + GetPartialPixelZ(x & 0xF, y & 0xF, tileh);
01406   } else {
01407     return GetTileMaxPixelZ(tile);
01408   }
01409 }
01410 
01411 static Foundation GetFoundation_Road(TileIndex tile, Slope tileh)
01412 {
01413   if (IsNormalRoad(tile)) {
01414     return GetRoadFoundation(tileh, GetAllRoadBits(tile));
01415   } else {
01416     return FlatteningFoundation(tileh);
01417   }
01418 }
01419 
01420 static const Roadside _town_road_types[][2] = {
01421   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01422   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01423   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01424   { ROADSIDE_TREES,         ROADSIDE_TREES },
01425   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01426 };
01427 
01428 static const Roadside _town_road_types_2[][2] = {
01429   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01430   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01431   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01432   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01433   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01434 };
01435 
01436 
01437 static void TileLoop_Road(TileIndex tile)
01438 {
01439   switch (_settings_game.game_creation.landscape) {
01440     case LT_ARCTIC:
01441       if (IsOnSnow(tile) != (GetTileZ(tile) > GetSnowLine())) {
01442         ToggleSnow(tile);
01443         MarkTileDirtyByTile(tile);
01444       }
01445       break;
01446 
01447     case LT_TROPIC:
01448       if (GetTropicZone(tile) == TROPICZONE_DESERT && !IsOnDesert(tile)) {
01449         ToggleDesert(tile);
01450         MarkTileDirtyByTile(tile);
01451       }
01452       break;
01453   }
01454 
01455   if (IsRoadDepot(tile)) return;
01456 
01457   const Town *t = ClosestTownFromTile(tile, UINT_MAX);
01458   if (!HasRoadWorks(tile)) {
01459     HouseZonesBits grp = HZB_TOWN_EDGE;
01460 
01461     if (t != NULL) {
01462       grp = GetTownRadiusGroup(t, tile);
01463 
01464       /* Show an animation to indicate road work */
01465       if (t->road_build_months != 0 &&
01466           (DistanceManhattan(t->xy, tile) < 8 || grp != HZB_TOWN_EDGE) &&
01467           IsNormalRoad(tile) && !HasAtMostOneBit(GetAllRoadBits(tile))) {
01468         if (GetFoundationSlope(tile) == SLOPE_FLAT && EnsureNoVehicleOnGround(tile).Succeeded() && Chance16(1, 40)) {
01469           StartRoadWorks(tile);
01470 
01471           SndPlayTileFx(SND_21_JACKHAMMER, tile);
01472           CreateEffectVehicleAbove(
01473             TileX(tile) * TILE_SIZE + 7,
01474             TileY(tile) * TILE_SIZE + 7,
01475             0,
01476             EV_BULLDOZER);
01477           MarkTileDirtyByTile(tile);
01478           return;
01479         }
01480       }
01481     }
01482 
01483     {
01484       /* Adjust road ground type depending on 'grp' (grp is the distance to the center) */
01485       const Roadside *new_rs = (_settings_game.game_creation.landscape == LT_TOYLAND) ? _town_road_types_2[grp] : _town_road_types[grp];
01486       Roadside cur_rs = GetRoadside(tile);
01487 
01488       /* We have our desired type, do nothing */
01489       if (cur_rs == new_rs[0]) return;
01490 
01491       /* We have the pre-type of the desired type, switch to the desired type */
01492       if (cur_rs == new_rs[1]) {
01493         cur_rs = new_rs[0];
01494       /* We have barren land, install the pre-type */
01495       } else if (cur_rs == ROADSIDE_BARREN) {
01496         cur_rs = new_rs[1];
01497       /* We're totally off limits, remove any installation and make barren land */
01498       } else {
01499         cur_rs = ROADSIDE_BARREN;
01500       }
01501       SetRoadside(tile, cur_rs);
01502       MarkTileDirtyByTile(tile);
01503     }
01504   } else if (IncreaseRoadWorksCounter(tile)) {
01505     TerminateRoadWorks(tile);
01506 
01507     if (_settings_game.economy.mod_road_rebuild) {
01508       /* Generate a nicer town surface */
01509       const RoadBits old_rb = GetAnyRoadBits(tile, ROADTYPE_ROAD);
01510       const RoadBits new_rb = CleanUpRoadBits(tile, old_rb);
01511 
01512       if (old_rb != new_rb) {
01513         RemoveRoad(tile, DC_EXEC | DC_AUTO | DC_NO_WATER, (old_rb ^ new_rb), ROADTYPE_ROAD, true);
01514       }
01515     }
01516 
01517     MarkTileDirtyByTile(tile);
01518   }
01519 }
01520 
01521 static bool ClickTile_Road(TileIndex tile)
01522 {
01523   if (!IsRoadDepot(tile)) return false;
01524 
01525   ShowDepotWindow(tile, VEH_ROAD);
01526   return true;
01527 }
01528 
01529 /* Converts RoadBits to TrackBits */
01530 static const TrackBits _road_trackbits[16] = {
01531   TRACK_BIT_NONE,                                  // ROAD_NONE
01532   TRACK_BIT_NONE,                                  // ROAD_NW
01533   TRACK_BIT_NONE,                                  // ROAD_SW
01534   TRACK_BIT_LEFT,                                  // ROAD_W
01535   TRACK_BIT_NONE,                                  // ROAD_SE
01536   TRACK_BIT_Y,                                     // ROAD_Y
01537   TRACK_BIT_LOWER,                                 // ROAD_S
01538   TRACK_BIT_LEFT | TRACK_BIT_LOWER | TRACK_BIT_Y,  // ROAD_Y | ROAD_SW
01539   TRACK_BIT_NONE,                                  // ROAD_NE
01540   TRACK_BIT_UPPER,                                 // ROAD_N
01541   TRACK_BIT_X,                                     // ROAD_X
01542   TRACK_BIT_LEFT | TRACK_BIT_UPPER | TRACK_BIT_X,  // ROAD_X | ROAD_NW
01543   TRACK_BIT_RIGHT,                                 // ROAD_E
01544   TRACK_BIT_RIGHT | TRACK_BIT_UPPER | TRACK_BIT_Y, // ROAD_Y | ROAD_NE
01545   TRACK_BIT_RIGHT | TRACK_BIT_LOWER | TRACK_BIT_X, // ROAD_X | ROAD_SE
01546   TRACK_BIT_ALL,                                   // ROAD_ALL
01547 };
01548 
01549 static TrackStatus GetTileTrackStatus_Road(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
01550 {
01551   TrackdirBits trackdirbits = TRACKDIR_BIT_NONE;
01552   TrackdirBits red_signals = TRACKDIR_BIT_NONE; // crossing barred
01553   switch (mode) {
01554     case TRANSPORT_RAIL:
01555       if (IsLevelCrossing(tile)) trackdirbits = TrackBitsToTrackdirBits(GetCrossingRailBits(tile));
01556       break;
01557 
01558     case TRANSPORT_ROAD:
01559       if ((GetRoadTypes(tile) & sub_mode) == 0) break;
01560       switch (GetRoadTileType(tile)) {
01561         case ROAD_TILE_NORMAL: {
01562           const uint drd_to_multiplier[DRD_END] = { 0x101, 0x100, 0x1, 0x0 };
01563           RoadType rt = (RoadType)FindFirstBit(sub_mode);
01564           RoadBits bits = GetRoadBits(tile, rt);
01565 
01566           /* no roadbit at this side of tile, return 0 */
01567           if (side != INVALID_DIAGDIR && (DiagDirToRoadBits(side) & bits) == 0) break;
01568 
01569           uint multiplier = drd_to_multiplier[rt == ROADTYPE_TRAM ? DRD_NONE : GetDisallowedRoadDirections(tile)];
01570           if (!HasRoadWorks(tile)) trackdirbits = (TrackdirBits)(_road_trackbits[bits] * multiplier);
01571           break;
01572         }
01573 
01574         case ROAD_TILE_CROSSING: {
01575           Axis axis = GetCrossingRoadAxis(tile);
01576 
01577           if (side != INVALID_DIAGDIR && axis != DiagDirToAxis(side)) break;
01578 
01579           trackdirbits = TrackBitsToTrackdirBits(AxisToTrackBits(axis));
01580           if (IsCrossingBarred(tile)) red_signals = trackdirbits;
01581           break;
01582         }
01583 
01584         default:
01585         case ROAD_TILE_DEPOT: {
01586           DiagDirection dir = GetRoadDepotDirection(tile);
01587 
01588           if (side != INVALID_DIAGDIR && side != dir) break;
01589 
01590           trackdirbits = TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir));
01591           break;
01592         }
01593       }
01594       break;
01595 
01596     default: break;
01597   }
01598   return CombineTrackStatus(trackdirbits, red_signals);
01599 }
01600 
01601 static const StringID _road_tile_strings[] = {
01602   STR_LAI_ROAD_DESCRIPTION_ROAD,
01603   STR_LAI_ROAD_DESCRIPTION_ROAD,
01604   STR_LAI_ROAD_DESCRIPTION_ROAD,
01605   STR_LAI_ROAD_DESCRIPTION_ROAD_WITH_STREETLIGHTS,
01606   STR_LAI_ROAD_DESCRIPTION_ROAD,
01607   STR_LAI_ROAD_DESCRIPTION_TREE_LINED_ROAD,
01608   STR_LAI_ROAD_DESCRIPTION_ROAD,
01609   STR_LAI_ROAD_DESCRIPTION_ROAD,
01610 };
01611 
01612 static void GetTileDesc_Road(TileIndex tile, TileDesc *td)
01613 {
01614   Owner rail_owner = INVALID_OWNER;
01615   Owner road_owner = INVALID_OWNER;
01616   Owner tram_owner = INVALID_OWNER;
01617 
01618   switch (GetRoadTileType(tile)) {
01619     case ROAD_TILE_CROSSING: {
01620       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_RAIL_LEVEL_CROSSING;
01621       RoadTypes rts = GetRoadTypes(tile);
01622       rail_owner = GetTileOwner(tile);
01623       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01624       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01625 
01626       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
01627       td->rail_speed = rti->max_speed;
01628 
01629       break;
01630     }
01631 
01632     case ROAD_TILE_DEPOT:
01633       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_VEHICLE_DEPOT;
01634       road_owner = GetTileOwner(tile); // Tile has only one owner, roadtype does not matter
01635       td->build_date = Depot::GetByTile(tile)->build_date;
01636       break;
01637 
01638     default: {
01639       RoadTypes rts = GetRoadTypes(tile);
01640       td->str = (HasBit(rts, ROADTYPE_ROAD) ? _road_tile_strings[GetRoadside(tile)] : STR_LAI_ROAD_DESCRIPTION_TRAMWAY);
01641       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01642       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01643       break;
01644     }
01645   }
01646 
01647   /* Now we have to discover, if the tile has only one owner or many:
01648    *   - Find a first_owner of the tile. (Currently road or tram must be present, but this will break when the third type becomes available)
01649    *   - Compare the found owner with the other owners, and test if they differ.
01650    * Note: If road exists it will be the first_owner.
01651    */
01652   Owner first_owner = (road_owner == INVALID_OWNER ? tram_owner : road_owner);
01653   bool mixed_owners = (tram_owner != INVALID_OWNER && tram_owner != first_owner) || (rail_owner != INVALID_OWNER && rail_owner != first_owner);
01654 
01655   if (mixed_owners) {
01656     /* Multiple owners */
01657     td->owner_type[0] = (rail_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_RAIL_OWNER);
01658     td->owner[0] = rail_owner;
01659     td->owner_type[1] = (road_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_ROAD_OWNER);
01660     td->owner[1] = road_owner;
01661     td->owner_type[2] = (tram_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_TRAM_OWNER);
01662     td->owner[2] = tram_owner;
01663   } else {
01664     /* One to rule them all */
01665     td->owner[0] = first_owner;
01666   }
01667 }
01668 
01673 static const byte _roadveh_enter_depot_dir[4] = {
01674   TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE
01675 };
01676 
01677 static VehicleEnterTileStatus VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
01678 {
01679   switch (GetRoadTileType(tile)) {
01680     case ROAD_TILE_DEPOT: {
01681       if (v->type != VEH_ROAD) break;
01682 
01683       RoadVehicle *rv = RoadVehicle::From(v);
01684       if (rv->frame == RVC_DEPOT_STOP_FRAME &&
01685           _roadveh_enter_depot_dir[GetRoadDepotDirection(tile)] == rv->state) {
01686         rv->state = RVSB_IN_DEPOT;
01687         rv->vehstatus |= VS_HIDDEN;
01688         rv->direction = ReverseDir(rv->direction);
01689         if (rv->Next() == NULL) VehicleEnterDepot(rv->First());
01690         rv->tile = tile;
01691 
01692         InvalidateWindowData(WC_VEHICLE_DEPOT, rv->tile);
01693         return VETSB_ENTERED_WORMHOLE;
01694       }
01695       break;
01696     }
01697 
01698     default: break;
01699   }
01700   return VETSB_CONTINUE;
01701 }
01702 
01703 
01704 static void ChangeTileOwner_Road(TileIndex tile, Owner old_owner, Owner new_owner)
01705 {
01706   if (IsRoadDepot(tile)) {
01707     if (GetTileOwner(tile) == old_owner) {
01708       if (new_owner == INVALID_OWNER) {
01709         DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
01710       } else {
01711         /* A road depot has two road bits. No need to dirty windows here, we'll redraw the whole screen anyway. */
01712         RoadType rt = (RoadType)FIND_FIRST_BIT(GetRoadTypes(tile));
01713         Company::Get(old_owner)->infrastructure.road[rt] -= 2;
01714         Company::Get(new_owner)->infrastructure.road[rt] += 2;
01715 
01716         SetTileOwner(tile, new_owner);
01717       }
01718     }
01719     return;
01720   }
01721 
01722   for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
01723     /* Update all roadtypes, no matter if they are present */
01724     if (GetRoadOwner(tile, rt) == old_owner) {
01725       if (HasTileRoadType(tile, rt)) {
01726         /* A level crossing has two road bits. No need to dirty windows here, we'll redraw the whole screen anyway. */
01727         uint num_bits = IsLevelCrossing(tile) ? 2 : CountBits(GetRoadBits(tile, rt));
01728         Company::Get(old_owner)->infrastructure.road[rt] -= num_bits;
01729         if (new_owner != INVALID_OWNER) Company::Get(new_owner)->infrastructure.road[rt] += num_bits;
01730       }
01731 
01732       SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
01733     }
01734   }
01735 
01736   if (IsLevelCrossing(tile)) {
01737     if (GetTileOwner(tile) == old_owner) {
01738       if (new_owner == INVALID_OWNER) {
01739         DoCommand(tile, 0, GetCrossingRailTrack(tile), DC_EXEC | DC_BANKRUPT, CMD_REMOVE_SINGLE_RAIL);
01740       } else {
01741         /* Update infrastructure counts. No need to dirty windows here, we'll redraw the whole screen anyway. */
01742         Company::Get(old_owner)->infrastructure.rail[GetRailType(tile)] -= LEVELCROSSING_TRACKBIT_FACTOR;
01743         Company::Get(new_owner)->infrastructure.rail[GetRailType(tile)] += LEVELCROSSING_TRACKBIT_FACTOR;
01744 
01745         SetTileOwner(tile, new_owner);
01746       }
01747     }
01748   }
01749 }
01750 
01751 static CommandCost TerraformTile_Road(TileIndex tile, DoCommandFlag flags, int z_new, Slope tileh_new)
01752 {
01753   if (_settings_game.construction.build_on_slopes && AutoslopeEnabled()) {
01754     switch (GetRoadTileType(tile)) {
01755       case ROAD_TILE_CROSSING:
01756         if (!IsSteepSlope(tileh_new) && (GetTileMaxZ(tile) == z_new + GetSlopeMaxZ(tileh_new)) && HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01757         break;
01758 
01759       case ROAD_TILE_DEPOT:
01760         if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRoadDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01761         break;
01762 
01763       case ROAD_TILE_NORMAL: {
01764         RoadBits bits = GetAllRoadBits(tile);
01765         RoadBits bits_copy = bits;
01766         /* Check if the slope-road_bits combination is valid at all, i.e. it is safe to call GetRoadFoundation(). */
01767         if (CheckRoadSlope(tileh_new, &bits_copy, ROAD_NONE, ROAD_NONE).Succeeded()) {
01768           /* CheckRoadSlope() sometimes changes the road_bits, if it does not agree with them. */
01769           if (bits == bits_copy) {
01770             int z_old;
01771             Slope tileh_old = GetTileSlope(tile, &z_old);
01772 
01773             /* Get the slope on top of the foundation */
01774             z_old += ApplyFoundationToSlope(GetRoadFoundation(tileh_old, bits), &tileh_old);
01775             z_new += ApplyFoundationToSlope(GetRoadFoundation(tileh_new, bits), &tileh_new);
01776 
01777             /* The surface slope must not be changed */
01778             if ((z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01779           }
01780         }
01781         break;
01782       }
01783 
01784       default: NOT_REACHED();
01785     }
01786   }
01787 
01788   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
01789 }
01790 
01792 extern const TileTypeProcs _tile_type_road_procs = {
01793   DrawTile_Road,           // draw_tile_proc
01794   GetSlopePixelZ_Road,     // get_slope_z_proc
01795   ClearTile_Road,          // clear_tile_proc
01796   NULL,                    // add_accepted_cargo_proc
01797   GetTileDesc_Road,        // get_tile_desc_proc
01798   GetTileTrackStatus_Road, // get_tile_track_status_proc
01799   ClickTile_Road,          // click_tile_proc
01800   NULL,                    // animate_tile_proc
01801   TileLoop_Road,           // tile_loop_proc
01802   ChangeTileOwner_Road,    // change_tile_owner_proc
01803   NULL,                    // add_produced_cargo_proc
01804   VehicleEnter_Road,       // vehicle_enter_tile_proc
01805   GetFoundation_Road,      // get_foundation_proc
01806   TerraformTile_Road,      // terraform_tile_proc
01807 };