road_cmd.cpp

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00001 /* $Id: road_cmd.cpp 18866 2010-01-18 22:57:21Z rubidium $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #include "stdafx.h"
00013 #include "cmd_helper.h"
00014 #include "road_internal.h"
00015 #include "landscape.h"
00016 #include "viewport_func.h"
00017 #include "command_func.h"
00018 #include "pathfinder/yapf/yapf_cache.h"
00019 #include "depot_base.h"
00020 #include "newgrf.h"
00021 #include "variables.h"
00022 #include "autoslope.h"
00023 #include "tunnelbridge_map.h"
00024 #include "window_func.h"
00025 #include "strings_func.h"
00026 #include "vehicle_func.h"
00027 #include "sound_func.h"
00028 #include "tunnelbridge.h"
00029 #include "cheat_type.h"
00030 #include "functions.h"
00031 #include "effectvehicle_func.h"
00032 #include "effectvehicle_base.h"
00033 #include "elrail_func.h"
00034 #include "roadveh.h"
00035 #include "town.h"
00036 #include "company_base.h"
00037 #include "core/random_func.hpp"
00038 
00039 #include "table/strings.h"
00040 
00045 bool RoadVehiclesAreBuilt()
00046 {
00047   const RoadVehicle *rv;
00048   FOR_ALL_ROADVEHICLES(rv) return true;
00049 
00050   return false;
00051 }
00052 
00053 #define M(x) (1 << (x))
00054 /* Level crossings may only be built on these slopes */
00055 static const uint32 VALID_LEVEL_CROSSING_SLOPES = (M(SLOPE_SEN) | M(SLOPE_ENW) | M(SLOPE_NWS) | M(SLOPE_NS) | M(SLOPE_WSE) | M(SLOPE_EW) | M(SLOPE_FLAT));
00056 #undef M
00057 
00058 /* Invalid RoadBits on slopes  */
00059 static const RoadBits _invalid_tileh_slopes_road[2][15] = {
00060   /* The inverse of the mixable RoadBits on a leveled slope */
00061   {
00062     ROAD_NONE,         // SLOPE_FLAT
00063     ROAD_NE | ROAD_SE, // SLOPE_W
00064     ROAD_NE | ROAD_NW, // SLOPE_S
00065 
00066     ROAD_NE,           // SLOPE_SW
00067     ROAD_NW | ROAD_SW, // SLOPE_E
00068     ROAD_NONE,         // SLOPE_EW
00069 
00070     ROAD_NW,           // SLOPE_SE
00071     ROAD_NONE,         // SLOPE_WSE
00072     ROAD_SE | ROAD_SW, // SLOPE_N
00073 
00074     ROAD_SE,           // SLOPE_NW
00075     ROAD_NONE,         // SLOPE_NS
00076     ROAD_NONE,         // SLOPE_ENW
00077 
00078     ROAD_SW,           // SLOPE_NE
00079     ROAD_NONE,         // SLOPE_SEN
00080     ROAD_NONE          // SLOPE_NWS
00081   },
00082   /* The inverse of the allowed straight roads on a slope
00083    * (with and without a foundation). */
00084   {
00085     ROAD_NONE, // SLOPE_FLAT
00086     ROAD_NONE, // SLOPE_W    Foundation
00087     ROAD_NONE, // SLOPE_S    Foundation
00088 
00089     ROAD_Y,    // SLOPE_SW
00090     ROAD_NONE, // SLOPE_E    Foundation
00091     ROAD_ALL,  // SLOPE_EW
00092 
00093     ROAD_X,    // SLOPE_SE
00094     ROAD_ALL,  // SLOPE_WSE
00095     ROAD_NONE, // SLOPE_N    Foundation
00096 
00097     ROAD_X,    // SLOPE_NW
00098     ROAD_ALL,  // SLOPE_NS
00099     ROAD_ALL,  // SLOPE_ENW
00100 
00101     ROAD_Y,    // SLOPE_NE
00102     ROAD_ALL,  // SLOPE_SEN
00103     ROAD_ALL   // SLOPE_NW
00104   }
00105 };
00106 
00107 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits);
00108 
00119 bool CheckAllowRemoveRoad(TileIndex tile, RoadBits remove, Owner owner, RoadType rt, DoCommandFlag flags, bool town_check)
00120 {
00121   if (_game_mode == GM_EDITOR || remove == ROAD_NONE) return true;
00122 
00123   /* Water can always flood and towns can always remove "normal" road pieces.
00124    * Towns are not be allowed to remove non "normal" road pieces, like tram
00125    * tracks as that would result in trams that cannot turn. */
00126   if (_current_company == OWNER_WATER ||
00127       (rt == ROADTYPE_ROAD && !Company::IsValidID(_current_company))) return true;
00128 
00129   /* Only do the special processing if the road is owned
00130    * by a town */
00131   if (owner != OWNER_TOWN) return (owner == OWNER_NONE) || CheckOwnership(owner);
00132 
00133   if (!town_check) return true;
00134 
00135   if (_cheats.magic_bulldozer.value) return true;
00136 
00137   Town *t = ClosestTownFromTile(tile, UINT_MAX);
00138   if (t == NULL) return true;
00139 
00140   /* check if you're allowed to remove the street owned by a town
00141    * removal allowance depends on difficulty setting */
00142   if (!CheckforTownRating(flags, t, ROAD_REMOVE)) return false;
00143 
00144   /* Get a bitmask of which neighbouring roads has a tile */
00145   RoadBits n = ROAD_NONE;
00146   RoadBits present = GetAnyRoadBits(tile, rt);
00147   if ((present & ROAD_NE) && (GetAnyRoadBits(TILE_ADDXY(tile, -1,  0), rt) & ROAD_SW)) n |= ROAD_NE;
00148   if ((present & ROAD_SE) && (GetAnyRoadBits(TILE_ADDXY(tile,  0,  1), rt) & ROAD_NW)) n |= ROAD_SE;
00149   if ((present & ROAD_SW) && (GetAnyRoadBits(TILE_ADDXY(tile,  1,  0), rt) & ROAD_NE)) n |= ROAD_SW;
00150   if ((present & ROAD_NW) && (GetAnyRoadBits(TILE_ADDXY(tile,  0, -1), rt) & ROAD_SE)) n |= ROAD_NW;
00151 
00152   int rating_decrease = RATING_ROAD_DOWN_STEP_EDGE;
00153   /* If 0 or 1 bits are set in n, or if no bits that match the bits to remove,
00154    * then allow it */
00155   if (KillFirstBit(n) != ROAD_NONE && (n & remove) != ROAD_NONE) {
00156     /* you can remove all kind of roads with extra dynamite */
00157     if (!_settings_game.construction.extra_dynamite) {
00158       SetDParam(0, t->index);
00159       _error_message = STR_ERROR_LOCAL_AUTHORITY_REFUSES_TO_ALLOW_THIS;
00160       return false;
00161     }
00162     rating_decrease = RATING_ROAD_DOWN_STEP_INNER;
00163   }
00164   ChangeTownRating(t, rating_decrease, RATING_ROAD_MINIMUM, flags);
00165 
00166   return true;
00167 }
00168 
00169 
00178 static CommandCost RemoveRoad(TileIndex tile, DoCommandFlag flags, RoadBits pieces, RoadType rt, bool crossing_check, bool town_check = true)
00179 {
00180   RoadTypes rts = GetRoadTypes(tile);
00181   /* The tile doesn't have the given road type */
00182   if (!HasBit(rts, rt)) return CMD_ERROR;
00183 
00184   switch (GetTileType(tile)) {
00185     case MP_ROAD:
00186       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00187       break;
00188 
00189     case MP_STATION:
00190       if (!IsDriveThroughStopTile(tile)) return CMD_ERROR;
00191       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00192       break;
00193 
00194     case MP_TUNNELBRIDGE:
00195       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) return CMD_ERROR;
00196       if (HasVehicleOnTunnelBridge(tile, GetOtherTunnelBridgeEnd(tile))) return CMD_ERROR;
00197       break;
00198 
00199     default:
00200       return CMD_ERROR;
00201   }
00202 
00203   if (!CheckAllowRemoveRoad(tile, pieces, GetRoadOwner(tile, rt), rt, flags, town_check)) return CMD_ERROR;
00204 
00205   if (!IsTileType(tile, MP_ROAD)) {
00206     /* If it's the last roadtype, just clear the whole tile */
00207     if (rts == RoadTypeToRoadTypes(rt)) return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00208 
00209     CommandCost cost(EXPENSES_CONSTRUCTION);
00210     if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00211       TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
00212       /* Pay for *every* tile of the bridge or tunnel */
00213       cost.AddCost((GetTunnelBridgeLength(other_end, tile) + 2) * _price[PR_CLEAR_ROAD]);
00214       if (flags & DC_EXEC) {
00215         SetRoadTypes(other_end, GetRoadTypes(other_end) & ~RoadTypeToRoadTypes(rt));
00216         SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
00217 
00218         /* If the owner of the bridge sells all it's road, also move the ownership
00219          * to the owner of the other roadtype. */
00220         RoadType other_rt = (rt == ROADTYPE_ROAD) ? ROADTYPE_TRAM : ROADTYPE_ROAD;
00221         Owner other_owner = GetRoadOwner(tile, other_rt);
00222         if (other_owner != GetTileOwner(tile)) {
00223           SetTileOwner(tile, other_owner);
00224           SetTileOwner(other_end, other_owner);
00225         }
00226 
00227         /* Mark tiles diry that have been repaved */
00228         MarkTileDirtyByTile(tile);
00229         MarkTileDirtyByTile(other_end);
00230         if (IsBridge(tile)) {
00231           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
00232 
00233           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
00234         }
00235       }
00236     } else {
00237       assert(IsDriveThroughStopTile(tile));
00238       cost.AddCost(_price[PR_CLEAR_ROAD] * 2);
00239       if (flags & DC_EXEC) {
00240         SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
00241         MarkTileDirtyByTile(tile);
00242       }
00243     }
00244     return cost;
00245   }
00246 
00247   switch (GetRoadTileType(tile)) {
00248     case ROAD_TILE_NORMAL: {
00249       const Slope tileh = GetTileSlope(tile, NULL);
00250       RoadBits present = GetRoadBits(tile, rt);
00251       const RoadBits other = GetOtherRoadBits(tile, rt);
00252       const Foundation f = GetRoadFoundation(tileh, present);
00253 
00254       if (HasRoadWorks(tile) && _current_company != OWNER_WATER) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00255 
00256       /* Autocomplete to a straight road
00257        * @li on steep slopes
00258        * @li if the bits of the other roadtypes result in another foundation
00259        * @li if build on slopes is disabled */
00260       if (IsSteepSlope(tileh) || (IsStraightRoad(other) &&
00261           (other & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) != ROAD_NONE) ||
00262           (tileh != SLOPE_FLAT && !_settings_game.construction.build_on_slopes)) {
00263         pieces |= MirrorRoadBits(pieces);
00264       }
00265 
00266       /* limit the bits to delete to the existing bits. */
00267       pieces &= present;
00268       if (pieces == ROAD_NONE) return CMD_ERROR;
00269 
00270       /* Now set present what it will be after the remove */
00271       present ^= pieces;
00272 
00273       /* Check for invalid RoadBit combinations on slopes */
00274       if (tileh != SLOPE_FLAT && present != ROAD_NONE &&
00275           (present & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) == present) {
00276         return CMD_ERROR;
00277       }
00278 
00279       if (flags & DC_EXEC) {
00280         if (HasRoadWorks(tile)) {
00281           /* flooding tile with road works, don't forget to remove the effect vehicle too */
00282           assert(_current_company == OWNER_WATER);
00283           EffectVehicle *v;
00284           FOR_ALL_EFFECTVEHICLES(v) {
00285             if (TileVirtXY(v->x_pos, v->y_pos) == tile) {
00286               delete v;
00287             }
00288           }
00289         }
00290         if (present == ROAD_NONE) {
00291           RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));
00292           if (rts == ROADTYPES_NONE) {
00293             /* Includes MarkTileDirtyByTile() */
00294             DoClearSquare(tile);
00295           } else {
00296             if (rt == ROADTYPE_ROAD && IsRoadOwner(tile, ROADTYPE_ROAD, OWNER_TOWN)) {
00297               /* Update nearest-town index */
00298               const Town *town = CalcClosestTownFromTile(tile);
00299               SetTownIndex(tile, town == NULL ? (TownID)INVALID_TOWN : town->index);
00300             }
00301             SetRoadBits(tile, ROAD_NONE, rt);
00302             SetRoadTypes(tile, rts);
00303             MarkTileDirtyByTile(tile);
00304           }
00305         } else {
00306           /* When bits are removed, you *always* end up with something that
00307            * is not a complete straight road tile. However, trams do not have
00308            * onewayness, so they cannot remove it either. */
00309           if (rt != ROADTYPE_TRAM) SetDisallowedRoadDirections(tile, DRD_NONE);
00310           SetRoadBits(tile, present, rt);
00311           MarkTileDirtyByTile(tile);
00312         }
00313       }
00314 
00315       /* If we change the foundation we have to pay for it. */
00316       return CommandCost(EXPENSES_CONSTRUCTION, CountBits(pieces) * _price[PR_CLEAR_ROAD] +
00317           ((GetRoadFoundation(tileh, present) != f) ? _price[PR_BUILD_FOUNDATION] : (Money)0));
00318     }
00319 
00320     case ROAD_TILE_CROSSING: {
00321       if (pieces & ComplementRoadBits(GetCrossingRoadBits(tile))) {
00322         return CMD_ERROR;
00323       }
00324 
00325       /* Don't allow road to be removed from the crossing when there is tram;
00326        * we can't draw the crossing without roadbits ;) */
00327       if (rt == ROADTYPE_ROAD && HasTileRoadType(tile, ROADTYPE_TRAM) && (flags & DC_EXEC || crossing_check)) return CMD_ERROR;
00328 
00329       if (flags & DC_EXEC) {
00330         Track railtrack = GetCrossingRailTrack(tile);
00331         RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));
00332         if (rts == ROADTYPES_NONE) {
00333           TrackBits tracks = GetCrossingRailBits(tile);
00334           bool reserved = HasCrossingReservation(tile);
00335           MakeRailNormal(tile, GetTileOwner(tile), tracks, GetRailType(tile));
00336           if (reserved) SetTrackReservation(tile, tracks);
00337         } else {
00338           SetRoadTypes(tile, rts);
00339           /* If we ever get HWAY and it is possible without road then we will need to promote ownership and invalidate town index here, too */
00340         }
00341         MarkTileDirtyByTile(tile);
00342         YapfNotifyTrackLayoutChange(tile, railtrack);
00343       }
00344       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_ROAD] * 2);
00345     }
00346 
00347     default:
00348     case ROAD_TILE_DEPOT:
00349       return CMD_ERROR;
00350   }
00351 }
00352 
00353 
00363 CommandCost CmdRemoveRoad(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00364 {
00365   RoadType rt = (RoadType)GB(p1, 4, 2);
00366   if (!IsValidRoadType(rt)) return CMD_ERROR;
00367 
00368   RoadBits pieces = Extract<RoadBits, 0>(p1);
00369 
00370   return RemoveRoad(tile, flags, pieces, rt, true);
00371 }
00372 
00384 static CommandCost CheckRoadSlope(Slope tileh, RoadBits *pieces, RoadBits existing, RoadBits other)
00385 {
00386   /* Remove already build pieces */
00387   CLRBITS(*pieces, existing);
00388 
00389   /* If we can't build anything stop here */
00390   if (*pieces == ROAD_NONE) return CMD_ERROR;
00391 
00392   /* All RoadBit combos are valid on flat land */
00393   if (tileh == SLOPE_FLAT) return CommandCost();
00394 
00395   /* Proceed steep Slopes first to reduce lookup table size */
00396   if (IsSteepSlope(tileh)) {
00397     /* Force straight roads. */
00398     *pieces |= MirrorRoadBits(*pieces);
00399 
00400     /* Use existing as all existing since only straight
00401      * roads are allowed here. */
00402     existing |= other;
00403 
00404     if ((existing == ROAD_NONE || existing == *pieces) && IsStraightRoad(*pieces)) {
00405       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00406     }
00407     return CMD_ERROR;
00408   }
00409 
00410   /* Save the merge of all bits of the current type */
00411   RoadBits type_bits = existing | *pieces;
00412 
00413   /* Roads on slopes */
00414   if (_settings_game.construction.build_on_slopes && (_invalid_tileh_slopes_road[0][tileh] & (other | type_bits)) == ROAD_NONE) {
00415 
00416     /* If we add leveling we've got to pay for it */
00417     if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00418 
00419     return CommandCost();
00420   }
00421 
00422   /* Autocomplete uphill roads */
00423   *pieces |= MirrorRoadBits(*pieces);
00424   type_bits = existing | *pieces;
00425 
00426   /* Uphill roads */
00427   if (IsStraightRoad(type_bits) && (other == type_bits || other == ROAD_NONE) &&
00428       (_invalid_tileh_slopes_road[1][tileh] & (other | type_bits)) == ROAD_NONE) {
00429 
00430     /* Slopes with foundation ? */
00431     if (IsSlopeWithOneCornerRaised(tileh)) {
00432 
00433       /* Prevent build on slopes if it isn't allowed */
00434       if (_settings_game.construction.build_on_slopes) {
00435 
00436         /* If we add foundation we've got to pay for it */
00437         if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00438 
00439         return CommandCost();
00440       }
00441     } else {
00442       if (CountBits(existing) == 1) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00443       return CommandCost();
00444     }
00445   }
00446   return CMD_ERROR;
00447 }
00448 
00459 CommandCost CmdBuildRoad(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00460 {
00461   CommandCost cost(EXPENSES_CONSTRUCTION);
00462 
00463   RoadBits existing = ROAD_NONE;
00464   RoadBits other_bits = ROAD_NONE;
00465 
00466   /* Road pieces are max 4 bitset values (NE, NW, SE, SW) and town can only be non-zero
00467    * if a non-company is building the road */
00468   if ((Company::IsValidID(_current_company) && p2 != 0) || (_current_company == OWNER_TOWN && !Town::IsValidID(p2))) return CMD_ERROR;
00469   if (_current_company != OWNER_TOWN) {
00470     const Town *town = CalcClosestTownFromTile(tile);
00471     p2 = (town != NULL) ? town->index : (TownID)INVALID_TOWN;
00472   }
00473 
00474   RoadBits pieces = Extract<RoadBits, 0>(p1);
00475 
00476   /* do not allow building 'zero' road bits, code wouldn't handle it */
00477   if (pieces == ROAD_NONE) return CMD_ERROR;
00478 
00479   RoadType rt = (RoadType)GB(p1, 4, 2);
00480   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00481 
00482   DisallowedRoadDirections toggle_drd = (DisallowedRoadDirections)GB(p1, 6, 2);
00483 
00484   Slope tileh = GetTileSlope(tile, NULL);
00485 
00486   switch (GetTileType(tile)) {
00487     case MP_ROAD:
00488       switch (GetRoadTileType(tile)) {
00489         case ROAD_TILE_NORMAL: {
00490           if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00491 
00492           other_bits = GetOtherRoadBits(tile, rt);
00493           if (!HasTileRoadType(tile, rt)) break;
00494 
00495           existing = GetRoadBits(tile, rt);
00496           bool crossing = !IsStraightRoad(existing | pieces);
00497           if (rt != ROADTYPE_TRAM && (GetDisallowedRoadDirections(tile) != DRD_NONE || toggle_drd != DRD_NONE) && crossing) {
00498             /* Junctions cannot be one-way */
00499             return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
00500           }
00501           if ((existing & pieces) == pieces) {
00502             /* We only want to set the (dis)allowed road directions */
00503             if (toggle_drd != DRD_NONE && rt != ROADTYPE_TRAM) {
00504               if (crossing) return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
00505 
00506               Owner owner = GetRoadOwner(tile, ROADTYPE_ROAD);
00507               if (owner != OWNER_NONE && !CheckOwnership(owner, tile)) return CMD_ERROR;
00508 
00509               if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00510 
00511               /* Ignore half built tiles */
00512               if ((flags & DC_EXEC) && rt != ROADTYPE_TRAM && IsStraightRoad(existing)) {
00513                 SetDisallowedRoadDirections(tile, GetDisallowedRoadDirections(tile) ^ toggle_drd);
00514                 MarkTileDirtyByTile(tile);
00515               }
00516               return CommandCost();
00517             }
00518             return_cmd_error(STR_ERROR_ALREADY_BUILT);
00519           }
00520         } break;
00521 
00522         case ROAD_TILE_CROSSING:
00523           other_bits = GetCrossingRoadBits(tile);
00524           if (pieces & ComplementRoadBits(other_bits)) goto do_clear;
00525           pieces = other_bits; // we need to pay for both roadbits
00526 
00527           if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00528           break;
00529 
00530         case ROAD_TILE_DEPOT:
00531           if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00532           goto do_clear;
00533 
00534         default: NOT_REACHED();
00535       }
00536       break;
00537 
00538     case MP_RAILWAY: {
00539       if (IsSteepSlope(tileh)) {
00540         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00541       }
00542 
00543       /* Level crossings may only be built on these slopes */
00544       if (!HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh)) {
00545         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00546       }
00547 
00548       if (GetRailTileType(tile) != RAIL_TILE_NORMAL) goto do_clear;
00549 
00550       Axis roaddir;
00551       switch (GetTrackBits(tile)) {
00552         case TRACK_BIT_X:
00553           if (pieces & ROAD_X) goto do_clear;
00554           roaddir = AXIS_Y;
00555           break;
00556 
00557         case TRACK_BIT_Y:
00558           if (pieces & ROAD_Y) goto do_clear;
00559           roaddir = AXIS_X;
00560           break;
00561 
00562         default: goto do_clear;
00563       }
00564 
00565       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00566 
00567       if (flags & DC_EXEC) {
00568         Track railtrack = AxisToTrack(OtherAxis(roaddir));
00569         YapfNotifyTrackLayoutChange(tile, railtrack);
00570         /* Always add road to the roadtypes (can't draw without it) */
00571         bool reserved = HasBit(GetRailReservationTrackBits(tile), railtrack);
00572         MakeRoadCrossing(tile, _current_company, _current_company, GetTileOwner(tile), roaddir, GetRailType(tile), RoadTypeToRoadTypes(rt) | ROADTYPES_ROAD, p2);
00573         SetCrossingReservation(tile, reserved);
00574         UpdateLevelCrossing(tile, false);
00575         MarkTileDirtyByTile(tile);
00576       }
00577       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_ROAD] * (rt == ROADTYPE_ROAD ? 2 : 4));
00578     }
00579 
00580     case MP_STATION: {
00581       if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00582       if (!IsDriveThroughStopTile(tile)) goto do_clear;
00583 
00584       RoadBits curbits = AxisToRoadBits(DiagDirToAxis(GetRoadStopDir(tile)));
00585       if (pieces & ~curbits) goto do_clear;
00586       pieces = curbits; // we need to pay for both roadbits
00587 
00588       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00589     } break;
00590 
00591     case MP_TUNNELBRIDGE:
00592       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) goto do_clear;
00593       if (MirrorRoadBits(DiagDirToRoadBits(GetTunnelBridgeDirection(tile))) != pieces) goto do_clear;
00594       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00595       /* Don't allow adding roadtype to the bridge/tunnel when vehicles are already driving on it */
00596       if (HasVehicleOnTunnelBridge(tile, GetOtherTunnelBridgeEnd(tile))) return CMD_ERROR;
00597       break;
00598 
00599     default: {
00600 do_clear:;
00601       CommandCost ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00602       if (ret.Failed()) return ret;
00603       cost.AddCost(ret);
00604     } break;
00605   }
00606 
00607   if (other_bits != pieces) {
00608     /* Check the foundation/slopes when adding road/tram bits */
00609     CommandCost ret = CheckRoadSlope(tileh, &pieces, existing, other_bits);
00610     /* Return an error if we need to build a foundation (ret != 0) but the
00611      * current setting is turned off */
00612     if (ret.Failed() || (ret.GetCost() != 0 && !_settings_game.construction.build_on_slopes)) {
00613       return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00614     }
00615     cost.AddCost(ret);
00616   }
00617 
00618   if (IsTileType(tile, MP_ROAD)) {
00619     /* Don't put the pieces that already exist */
00620     pieces &= ComplementRoadBits(existing);
00621 
00622     /* Check if new road bits will have the same foundation as other existing road types */
00623     if (IsNormalRoad(tile)) {
00624       Slope slope = GetTileSlope(tile, NULL);
00625       Foundation found_new = GetRoadFoundation(slope, pieces | existing);
00626 
00627       /* Test if all other roadtypes can be built at that foundation */
00628       for (RoadType rtest = ROADTYPE_ROAD; rtest < ROADTYPE_END; rtest++) {
00629         if (rtest != rt) { // check only other road types
00630           RoadBits bits = GetRoadBits(tile, rtest);
00631           /* do not check if there are not road bits of given type */
00632           if (bits != ROAD_NONE && GetRoadFoundation(slope, bits) != found_new) {
00633             return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00634           }
00635         }
00636       }
00637     }
00638   }
00639 
00640   if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00641 
00642   cost.AddCost(CountBits(pieces) * _price[PR_BUILD_ROAD]);
00643   if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00644     /* Pay for *every* tile of the bridge or tunnel */
00645     cost.MultiplyCost(GetTunnelBridgeLength(GetOtherTunnelBridgeEnd(tile), tile) + 2);
00646   }
00647 
00648   if (flags & DC_EXEC) {
00649     switch (GetTileType(tile)) {
00650       case MP_ROAD: {
00651         RoadTileType rtt = GetRoadTileType(tile);
00652         if (existing == ROAD_NONE || rtt == ROAD_TILE_CROSSING) {
00653           SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00654           SetRoadOwner(tile, rt, _current_company);
00655           if (rt == ROADTYPE_ROAD) SetTownIndex(tile, p2);
00656         }
00657         if (rtt != ROAD_TILE_CROSSING) SetRoadBits(tile, existing | pieces, rt);
00658       } break;
00659 
00660       case MP_TUNNELBRIDGE: {
00661         TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
00662 
00663         SetRoadTypes(other_end, GetRoadTypes(other_end) | RoadTypeToRoadTypes(rt));
00664         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00665         SetRoadOwner(other_end, rt, _current_company);
00666         SetRoadOwner(tile, rt, _current_company);
00667 
00668         /* Mark tiles diry that have been repaved */
00669         MarkTileDirtyByTile(other_end);
00670         MarkTileDirtyByTile(tile);
00671         if (IsBridge(tile)) {
00672           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
00673 
00674           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
00675         }
00676       } break;
00677 
00678       case MP_STATION:
00679         assert(IsDriveThroughStopTile(tile));
00680         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00681         SetRoadOwner(tile, rt, _current_company);
00682         break;
00683 
00684       default:
00685         MakeRoadNormal(tile, pieces, RoadTypeToRoadTypes(rt), p2, _current_company, _current_company);
00686         break;
00687     }
00688 
00689     if (rt != ROADTYPE_TRAM && IsNormalRoadTile(tile)) {
00690       existing |= pieces;
00691       SetDisallowedRoadDirections(tile, IsStraightRoad(existing) ?
00692           GetDisallowedRoadDirections(tile) ^ toggle_drd : DRD_NONE);
00693     }
00694 
00695     MarkTileDirtyByTile(tile);
00696   }
00697   return cost;
00698 }
00699 
00713 CommandCost CmdBuildLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00714 {
00715   CommandCost cost(EXPENSES_CONSTRUCTION);
00716   bool had_bridge = false;
00717   bool had_tunnel = false;
00718   bool had_success = false;
00719   DisallowedRoadDirections drd = DRD_NORTHBOUND;
00720 
00721   _error_message = INVALID_STRING_ID;
00722 
00723   if (p1 >= MapSize()) return CMD_ERROR;
00724 
00725   TileIndex end_tile = p1;
00726   RoadType rt = (RoadType)GB(p2, 3, 2);
00727   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00728 
00729   Axis axis = Extract<Axis, 2>(p2);
00730   /* Only drag in X or Y direction dictated by the direction variable */
00731   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00732   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00733 
00734   DiagDirection dir = AxisToDiagDir(axis);
00735 
00736   /* Swap direction, also the half-tile drag var (bit 0 and 1) */
00737   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00738     dir = ReverseDiagDir(dir);
00739     p2 ^= 3;
00740     drd = DRD_SOUTHBOUND;
00741   }
00742 
00743   /* On the X-axis, we have to swap the initial bits, so they
00744    * will be interpreted correctly in the GTTS. Futhermore
00745    * when you just 'click' on one tile to build them. */
00746   if ((axis == AXIS_Y) == (start_tile == end_tile && HasBit(p2, 0) == HasBit(p2, 1))) drd ^= DRD_BOTH;
00747   /* No disallowed direction bits have to be toggled */
00748   if (!HasBit(p2, 5)) drd = DRD_NONE;
00749 
00750   TileIndex tile = start_tile;
00751   /* Start tile is the first tile clicked by the user. */
00752   for (;;) {
00753     RoadBits bits = AxisToRoadBits(axis);
00754 
00755     /* Road parts only have to be built at the start tile or at the end tile. */
00756     if (tile == end_tile && !HasBit(p2, 1)) bits &= DiagDirToRoadBits(ReverseDiagDir(dir));
00757     if (tile == start_tile && HasBit(p2, 0)) bits &= DiagDirToRoadBits(dir);
00758 
00759     _error_message = INVALID_STRING_ID;
00760     CommandCost ret = DoCommand(tile, drd << 6 | rt << 4 | bits, 0, flags, CMD_BUILD_ROAD);
00761     if (ret.Failed()) {
00762       if (_error_message != STR_ERROR_ALREADY_BUILT) break;
00763     } else {
00764       had_success = true;
00765       /* Only pay for the upgrade on one side of the bridges and tunnels */
00766       if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00767         if (IsBridge(tile)) {
00768           if ((!had_bridge || GetTunnelBridgeDirection(tile) == dir)) {
00769             cost.AddCost(ret);
00770           }
00771           had_bridge = true;
00772         } else { // IsTunnel(tile)
00773           if ((!had_tunnel || GetTunnelBridgeDirection(tile) == dir)) {
00774             cost.AddCost(ret);
00775           }
00776           had_tunnel = true;
00777         }
00778       } else {
00779         cost.AddCost(ret);
00780       }
00781     }
00782 
00783     if (tile == end_tile) break;
00784 
00785     tile += TileOffsByDiagDir(dir);
00786   }
00787 
00788   return !had_success ? CMD_ERROR : cost;
00789 }
00790 
00803 CommandCost CmdRemoveLongRoad(TileIndex end_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00804 {
00805   CommandCost cost(EXPENSES_CONSTRUCTION);
00806 
00807   if (p1 >= MapSize()) return CMD_ERROR;
00808 
00809   TileIndex start_tile = p1;
00810   RoadType rt = (RoadType)GB(p2, 3, 2);
00811   if (!IsValidRoadType(rt)) return CMD_ERROR;
00812 
00813   Axis axis = Extract<Axis, 2>(p2);
00814   /* Only drag in X or Y direction dictated by the direction variable */
00815   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00816   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00817 
00818   /* Swap start and ending tile, also the half-tile drag var (bit 0 and 1) */
00819   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00820     TileIndex t = start_tile;
00821     start_tile = end_tile;
00822     end_tile = t;
00823     p2 ^= IsInsideMM(p2 & 3, 1, 3) ? 3 : 0;
00824   }
00825 
00826   Money money = GetAvailableMoneyForCommand();
00827   TileIndex tile = start_tile;
00828   /* Start tile is the small number. */
00829   for (;;) {
00830     RoadBits bits = AxisToRoadBits(axis);
00831 
00832     if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
00833     if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
00834 
00835     /* try to remove the halves. */
00836     if (bits != 0) {
00837       CommandCost ret = RemoveRoad(tile, flags & ~DC_EXEC, bits, rt, true);
00838       if (ret.Succeeded()) {
00839         if (flags & DC_EXEC) {
00840           money -= ret.GetCost();
00841           if (money < 0) {
00842             _additional_cash_required = DoCommand(end_tile, start_tile, p2, flags & ~DC_EXEC, CMD_REMOVE_LONG_ROAD).GetCost();
00843             return cost;
00844           }
00845           RemoveRoad(tile, flags, bits, rt, true, false);
00846         }
00847         cost.AddCost(ret);
00848       }
00849     }
00850 
00851     if (tile == end_tile) break;
00852 
00853     tile += (axis == AXIS_Y) ? TileDiffXY(0, 1) : TileDiffXY(1, 0);
00854   }
00855 
00856   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
00857 }
00858 
00871 CommandCost CmdBuildRoadDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00872 {
00873   DiagDirection dir = Extract<DiagDirection, 0>(p1);
00874   RoadType rt = (RoadType)GB(p1, 2, 2);
00875 
00876   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00877 
00878   Slope tileh = GetTileSlope(tile, NULL);
00879   if (tileh != SLOPE_FLAT && (
00880         !_settings_game.construction.build_on_slopes ||
00881         IsSteepSlope(tileh) ||
00882         !CanBuildDepotByTileh(dir, tileh)
00883       )) {
00884     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00885   }
00886 
00887   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00888   if (cost.Failed()) return CMD_ERROR;
00889 
00890   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
00891 
00892   if (!Depot::CanAllocateItem()) return CMD_ERROR;
00893 
00894   if (flags & DC_EXEC) {
00895     Depot *dep = new Depot(tile);
00896     dep->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
00897 
00898     MakeRoadDepot(tile, _current_company, dep->index, dir, rt);
00899     MarkTileDirtyByTile(tile);
00900   }
00901   return cost.AddCost(_price[PR_BUILD_DEPOT_ROAD]);
00902 }
00903 
00904 static CommandCost RemoveRoadDepot(TileIndex tile, DoCommandFlag flags)
00905 {
00906   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER) return CMD_ERROR;
00907 
00908   if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00909 
00910   if (flags & DC_EXEC) {
00911     delete Depot::GetByTile(tile);
00912     DoClearSquare(tile);
00913   }
00914 
00915   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_ROAD]);
00916 }
00917 
00918 static CommandCost ClearTile_Road(TileIndex tile, DoCommandFlag flags)
00919 {
00920   switch (GetRoadTileType(tile)) {
00921     case ROAD_TILE_NORMAL: {
00922       RoadBits b = GetAllRoadBits(tile);
00923 
00924       /* Clear the road if only one piece is on the tile OR we are not using the DC_AUTO flag */
00925       if ((CountBits(b) == 1 && GetRoadBits(tile, ROADTYPE_TRAM) == ROAD_NONE) || !(flags & DC_AUTO)) {
00926         RoadTypes rts = GetRoadTypes(tile);
00927         CommandCost ret(EXPENSES_CONSTRUCTION);
00928         for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
00929           if (HasBit(rts, rt)) {
00930             CommandCost tmp_ret = RemoveRoad(tile, flags, GetRoadBits(tile, rt), rt, true);
00931             if (tmp_ret.Failed()) return tmp_ret;
00932             ret.AddCost(tmp_ret);
00933           }
00934         }
00935         return ret;
00936       }
00937       return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
00938     }
00939 
00940     case ROAD_TILE_CROSSING: {
00941       RoadTypes rts = GetRoadTypes(tile);
00942       CommandCost ret(EXPENSES_CONSTRUCTION);
00943 
00944       if (flags & DC_AUTO) return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
00945 
00946       /* Must iterate over the roadtypes in a reverse manner because
00947        * tram tracks must be removed before the road bits. */
00948       RoadType rt = ROADTYPE_TRAM;
00949       do {
00950         if (HasBit(rts, rt)) {
00951           CommandCost tmp_ret = RemoveRoad(tile, flags, GetCrossingRoadBits(tile), rt, false);
00952           if (tmp_ret.Failed()) return tmp_ret;
00953           ret.AddCost(tmp_ret);
00954         }
00955       } while (rt-- != ROADTYPE_ROAD);
00956 
00957       if (flags & DC_EXEC) {
00958         DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00959       }
00960       return ret;
00961     }
00962 
00963     default:
00964     case ROAD_TILE_DEPOT:
00965       if (flags & DC_AUTO) {
00966         return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
00967       }
00968       return RemoveRoadDepot(tile, flags);
00969   }
00970 }
00971 
00972 
00973 struct DrawRoadTileStruct {
00974   uint16 image;
00975   byte subcoord_x;
00976   byte subcoord_y;
00977 };
00978 
00979 #include "table/road_land.h"
00980 
00988 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits)
00989 {
00990   /* Flat land and land without a road doesn't require a foundation */
00991   if (tileh == SLOPE_FLAT || bits == ROAD_NONE) return FOUNDATION_NONE;
00992 
00993   if (!IsSteepSlope(tileh)) {
00994     /* Leveled RoadBits on a slope */
00995     if ((_invalid_tileh_slopes_road[0][tileh] & bits) == ROAD_NONE) return FOUNDATION_LEVELED;
00996 
00997     /* Straight roads without foundation on a slope */
00998     if (!IsSlopeWithOneCornerRaised(tileh) &&
00999         (_invalid_tileh_slopes_road[1][tileh] & bits) == ROAD_NONE)
01000       return FOUNDATION_NONE;
01001   }
01002 
01003   /* Roads on steep Slopes or on Slopes with one corner raised */
01004   return (bits == ROAD_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
01005 }
01006 
01007 const byte _road_sloped_sprites[14] = {
01008   0,  0,  2,  0,
01009   0,  1,  0,  0,
01010   3,  0,  0,  0,
01011   0,  0
01012 };
01013 
01024 static bool AlwaysDrawUnpavedRoads(TileIndex tile, Roadside roadside)
01025 {
01026   return (IsOnSnow(tile) &&
01027       !(_settings_game.game_creation.landscape == LT_TROPIC && HasGrfMiscBit(GMB_DESERT_PAVED_ROADS) &&
01028         roadside != ROADSIDE_BARREN && roadside != ROADSIDE_GRASS && roadside != ROADSIDE_GRASS_ROAD_WORKS));
01029 }
01030 
01036 void DrawTramCatenary(const TileInfo *ti, RoadBits tram)
01037 {
01038   /* Do not draw catenary if it is invisible */
01039   if (IsInvisibilitySet(TO_CATENARY)) return;
01040 
01041   /* Don't draw the catenary under a low bridge */
01042   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_CATENARY)) {
01043     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01044 
01045     if (height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) return;
01046   }
01047 
01048   SpriteID front;
01049   SpriteID back;
01050 
01051   if (ti->tileh != SLOPE_FLAT) {
01052     back  = SPR_TRAMWAY_BACK_WIRES_SLOPED  + _road_sloped_sprites[ti->tileh - 1];
01053     front = SPR_TRAMWAY_FRONT_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
01054   } else {
01055     back  = SPR_TRAMWAY_BASE + _road_backpole_sprites_1[tram];
01056     front = SPR_TRAMWAY_BASE + _road_frontwire_sprites_1[tram];
01057   }
01058 
01059   AddSortableSpriteToDraw(back,  PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01060   AddSortableSpriteToDraw(front, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01061 }
01062 
01071 static void DrawRoadDetail(SpriteID img, const TileInfo *ti, int dx, int dy, int h)
01072 {
01073   int x = ti->x | dx;
01074   int y = ti->y | dy;
01075   byte z = ti->z;
01076   if (ti->tileh != SLOPE_FLAT) z = GetSlopeZ(x, y);
01077   AddSortableSpriteToDraw(img, PAL_NONE, x, y, 2, 2, h, z);
01078 }
01079 
01084 static void DrawRoadBits(TileInfo *ti)
01085 {
01086   RoadBits road = GetRoadBits(ti->tile, ROADTYPE_ROAD);
01087   RoadBits tram = GetRoadBits(ti->tile, ROADTYPE_TRAM);
01088 
01089   SpriteID image = 0;
01090   SpriteID pal = PAL_NONE;
01091 
01092   if (ti->tileh != SLOPE_FLAT) {
01093     DrawFoundation(ti, GetRoadFoundation(ti->tileh, road | tram));
01094 
01095     /* DrawFoundation() modifies ti.
01096      * Default sloped sprites.. */
01097     if (ti->tileh != SLOPE_FLAT) image = _road_sloped_sprites[ti->tileh - 1] + 0x53F;
01098   }
01099 
01100   if (image == 0) image = _road_tile_sprites_1[road != ROAD_NONE ? road : tram];
01101 
01102   Roadside roadside = GetRoadside(ti->tile);
01103 
01104   if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01105     image += 19;
01106   } else {
01107     switch (roadside) {
01108       case ROADSIDE_BARREN:           pal = PALETTE_TO_BARE_LAND; break;
01109       case ROADSIDE_GRASS:            break;
01110       case ROADSIDE_GRASS_ROAD_WORKS: break;
01111       default:                        image -= 19; break; // Paved
01112     }
01113   }
01114 
01115   DrawGroundSprite(image, pal);
01116 
01117   /* For tram we overlay the road graphics with either tram tracks only
01118    * (when there is actual road beneath the trams) or with tram tracks
01119    * and some dirts which hides the road graphics */
01120   if (tram != ROAD_NONE) {
01121     if (ti->tileh != SLOPE_FLAT) {
01122       image = _road_sloped_sprites[ti->tileh - 1] + SPR_TRAMWAY_SLOPED_OFFSET;
01123     } else {
01124       image = _road_tile_sprites_1[tram] - SPR_ROAD_Y;
01125     }
01126     image += (road == ROAD_NONE) ? SPR_TRAMWAY_TRAM : SPR_TRAMWAY_OVERLAY;
01127     DrawGroundSprite(image, pal);
01128   }
01129 
01130   if (road != ROAD_NONE) {
01131     DisallowedRoadDirections drd = GetDisallowedRoadDirections(ti->tile);
01132     if (drd != DRD_NONE) {
01133       DrawGroundSpriteAt(SPR_ONEWAY_BASE + drd - 1 + ((road == ROAD_X) ? 0 : 3), PAL_NONE, 8, 8, GetPartialZ(8, 8, ti->tileh));
01134     }
01135   }
01136 
01137   if (HasRoadWorks(ti->tile)) {
01138     /* Road works */
01139     DrawGroundSprite((road | tram) & ROAD_X ? SPR_EXCAVATION_X : SPR_EXCAVATION_Y, PAL_NONE);
01140     return;
01141   }
01142 
01143   if (tram != ROAD_NONE) DrawTramCatenary(ti, tram);
01144 
01145   /* Return if full detail is disabled, or we are zoomed fully out. */
01146   if (!HasBit(_display_opt, DO_FULL_DETAIL) || _cur_dpi->zoom > ZOOM_LVL_DETAIL) return;
01147 
01148   /* Do not draw details (street lights, trees) under low bridge */
01149   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && (roadside == ROADSIDE_TREES || roadside == ROADSIDE_STREET_LIGHTS)) {
01150     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01151     uint minz = GetTileMaxZ(ti->tile) + 2 * TILE_HEIGHT;
01152 
01153     if (roadside == ROADSIDE_TREES) minz += TILE_HEIGHT;
01154 
01155     if (height < minz) return;
01156   }
01157 
01158   /* If there are no road bits, return, as there is nothing left to do */
01159   if (CountBits(road) < 2) return;
01160 
01161   /* Draw extra details. */
01162   for (const DrawRoadTileStruct *drts = _road_display_table[roadside][road | tram]; drts->image != 0; drts++) {
01163     DrawRoadDetail(drts->image, ti, drts->subcoord_x, drts->subcoord_y, 0x10);
01164   }
01165 }
01166 
01168 static void DrawTile_Road(TileInfo *ti)
01169 {
01170   switch (GetRoadTileType(ti->tile)) {
01171     case ROAD_TILE_NORMAL:
01172       DrawRoadBits(ti);
01173       break;
01174 
01175     case ROAD_TILE_CROSSING: {
01176       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01177 
01178       SpriteID image = GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.crossing;
01179       SpriteID pal = PAL_NONE;
01180 
01181       if (GetCrossingRoadAxis(ti->tile) == AXIS_X) image++;
01182       if (IsCrossingBarred(ti->tile)) image += 2;
01183 
01184       Roadside roadside = GetRoadside(ti->tile);
01185 
01186       if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01187         image += 8;
01188       } else {
01189         switch (roadside) {
01190           case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
01191           case ROADSIDE_GRASS:  break;
01192           default:              image += 4; break; // Paved
01193         }
01194       }
01195 
01196       DrawGroundSprite(image, pal);
01197 
01198       /* PBS debugging, draw reserved tracks darker */
01199       if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) {
01200         DrawGroundSprite(GetCrossingRoadAxis(ti->tile) == AXIS_Y ? GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_x : GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_y, PALETTE_CRASH);
01201       }
01202 
01203       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01204         DrawGroundSprite(SPR_TRAMWAY_OVERLAY + (GetCrossingRoadAxis(ti->tile) ^ 1), pal);
01205         DrawTramCatenary(ti, GetCrossingRoadBits(ti->tile));
01206       }
01207       if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01208       break;
01209     }
01210 
01211     default:
01212     case ROAD_TILE_DEPOT: {
01213       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01214 
01215       SpriteID palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
01216 
01217       const DrawTileSprites *dts;
01218       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01219         dts =  &_tram_depot[GetRoadDepotDirection(ti->tile)];
01220       } else {
01221         dts =  &_road_depot[GetRoadDepotDirection(ti->tile)];
01222       }
01223 
01224       DrawGroundSprite(dts->ground.sprite, PAL_NONE);
01225       DrawOrigTileSeq(ti, dts, TO_BUILDINGS, palette);
01226       break;
01227     }
01228   }
01229   DrawBridgeMiddle(ti);
01230 }
01231 
01232 void DrawRoadDepotSprite(int x, int y, DiagDirection dir, RoadType rt)
01233 {
01234   SpriteID palette = COMPANY_SPRITE_COLOUR(_local_company);
01235   const DrawTileSprites *dts = (rt == ROADTYPE_TRAM) ? &_tram_depot[dir] : &_road_depot[dir];
01236 
01237   x += 33;
01238   y += 17;
01239 
01240   DrawSprite(dts->ground.sprite, PAL_NONE, x, y);
01241   DrawOrigTileSeqInGUI(x, y, dts, palette);
01242 }
01243 
01249 void UpdateNearestTownForRoadTiles(bool invalidate)
01250 {
01251   assert(!invalidate || _generating_world);
01252 
01253   for (TileIndex t = 0; t < MapSize(); t++) {
01254     if (IsTileType(t, MP_ROAD) && !IsRoadDepot(t) && !HasTownOwnedRoad(t)) {
01255       TownID tid = (TownID)INVALID_TOWN;
01256       if (!invalidate) {
01257         const Town *town = CalcClosestTownFromTile(t);
01258         if (town != NULL) tid = town->index;
01259       }
01260       SetTownIndex(t, tid);
01261     }
01262   }
01263 }
01264 
01265 static uint GetSlopeZ_Road(TileIndex tile, uint x, uint y)
01266 {
01267   uint z;
01268   Slope tileh = GetTileSlope(tile, &z);
01269 
01270   if (tileh == SLOPE_FLAT) return z;
01271   if (IsNormalRoad(tile)) {
01272     Foundation f = GetRoadFoundation(tileh, GetAllRoadBits(tile));
01273     z += ApplyFoundationToSlope(f, &tileh);
01274     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
01275   } else {
01276     return z + TILE_HEIGHT;
01277   }
01278 }
01279 
01280 static Foundation GetFoundation_Road(TileIndex tile, Slope tileh)
01281 {
01282   if (IsNormalRoad(tile)) {
01283     return GetRoadFoundation(tileh, GetAllRoadBits(tile));
01284   } else {
01285     return FlatteningFoundation(tileh);
01286   }
01287 }
01288 
01289 static const Roadside _town_road_types[][2] = {
01290   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01291   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01292   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01293   { ROADSIDE_TREES,         ROADSIDE_TREES },
01294   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01295 };
01296 
01297 static const Roadside _town_road_types_2[][2] = {
01298   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01299   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01300   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01301   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01302   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01303 };
01304 
01305 
01306 static void TileLoop_Road(TileIndex tile)
01307 {
01308   switch (_settings_game.game_creation.landscape) {
01309     case LT_ARCTIC:
01310       if (IsOnSnow(tile) != (GetTileZ(tile) > GetSnowLine())) {
01311         ToggleSnow(tile);
01312         MarkTileDirtyByTile(tile);
01313       }
01314       break;
01315 
01316     case LT_TROPIC:
01317       if (GetTropicZone(tile) == TROPICZONE_DESERT && !IsOnDesert(tile)) {
01318         ToggleDesert(tile);
01319         MarkTileDirtyByTile(tile);
01320       }
01321       break;
01322   }
01323 
01324   if (IsRoadDepot(tile)) return;
01325 
01326   const Town *t = ClosestTownFromTile(tile, UINT_MAX);
01327   if (!HasRoadWorks(tile)) {
01328     HouseZonesBits grp = HZB_TOWN_EDGE;
01329 
01330     if (t != NULL) {
01331       grp = GetTownRadiusGroup(t, tile);
01332 
01333       /* Show an animation to indicate road work */
01334       if (t->road_build_months != 0 &&
01335           (DistanceManhattan(t->xy, tile) < 8 || grp != HZB_TOWN_EDGE) &&
01336           IsNormalRoad(tile) && CountBits(GetAllRoadBits(tile)) > 1 ) {
01337         if (GetFoundationSlope(tile, NULL) == SLOPE_FLAT && EnsureNoVehicleOnGround(tile) && Chance16(1, 40)) {
01338           StartRoadWorks(tile);
01339 
01340           SndPlayTileFx(SND_21_JACKHAMMER, tile);
01341           CreateEffectVehicleAbove(
01342             TileX(tile) * TILE_SIZE + 7,
01343             TileY(tile) * TILE_SIZE + 7,
01344             0,
01345             EV_BULLDOZER);
01346           MarkTileDirtyByTile(tile);
01347           return;
01348         }
01349       }
01350     }
01351 
01352     {
01353       /* Adjust road ground type depending on 'grp' (grp is the distance to the center) */
01354       const Roadside *new_rs = (_settings_game.game_creation.landscape == LT_TOYLAND) ? _town_road_types_2[grp] : _town_road_types[grp];
01355       Roadside cur_rs = GetRoadside(tile);
01356 
01357       /* We have our desired type, do nothing */
01358       if (cur_rs == new_rs[0]) return;
01359 
01360       /* We have the pre-type of the desired type, switch to the desired type */
01361       if (cur_rs == new_rs[1]) {
01362         cur_rs = new_rs[0];
01363       /* We have barren land, install the pre-type */
01364       } else if (cur_rs == ROADSIDE_BARREN) {
01365         cur_rs = new_rs[1];
01366       /* We're totally off limits, remove any installation and make barren land */
01367       } else {
01368         cur_rs = ROADSIDE_BARREN;
01369       }
01370       SetRoadside(tile, cur_rs);
01371       MarkTileDirtyByTile(tile);
01372     }
01373   } else if (IncreaseRoadWorksCounter(tile)) {
01374     TerminateRoadWorks(tile);
01375 
01376     if (_settings_game.economy.mod_road_rebuild) {
01377       /* Generate a nicer town surface */
01378       const RoadBits old_rb = GetAnyRoadBits(tile, ROADTYPE_ROAD);
01379       const RoadBits new_rb = CleanUpRoadBits(tile, old_rb);
01380 
01381       if (old_rb != new_rb) {
01382         RemoveRoad(tile, DC_EXEC | DC_AUTO | DC_NO_WATER, (old_rb ^ new_rb), ROADTYPE_ROAD, true);
01383       }
01384     }
01385 
01386     MarkTileDirtyByTile(tile);
01387   }
01388 }
01389 
01390 static bool ClickTile_Road(TileIndex tile)
01391 {
01392   if (!IsRoadDepot(tile)) return false;
01393 
01394   ShowDepotWindow(tile, VEH_ROAD);
01395   return true;
01396 }
01397 
01398 /* Converts RoadBits to TrackBits */
01399 static const byte _road_trackbits[16] = {
01400   0x0, 0x0, 0x0, 0x10, 0x0, 0x2, 0x8, 0x1A, 0x0, 0x4, 0x1, 0x15, 0x20, 0x26, 0x29, 0x3F,
01401 };
01402 
01403 static TrackStatus GetTileTrackStatus_Road(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
01404 {
01405   TrackdirBits trackdirbits = TRACKDIR_BIT_NONE;
01406   TrackdirBits red_signals = TRACKDIR_BIT_NONE; // crossing barred
01407   switch (mode) {
01408     case TRANSPORT_RAIL:
01409       if (IsLevelCrossing(tile)) trackdirbits = TrackBitsToTrackdirBits(GetCrossingRailBits(tile));
01410       break;
01411 
01412     case TRANSPORT_ROAD:
01413       if ((GetRoadTypes(tile) & sub_mode) == 0) break;
01414       switch (GetRoadTileType(tile)) {
01415         case ROAD_TILE_NORMAL: {
01416           const uint drd_to_multiplier[DRD_END] = { 0x101, 0x100, 0x1, 0x0 };
01417           RoadType rt = (RoadType)FindFirstBit(sub_mode);
01418           RoadBits bits = GetRoadBits(tile, rt);
01419 
01420           /* no roadbit at this side of tile, return 0 */
01421           if (side != INVALID_DIAGDIR && (DiagDirToRoadBits(side) & bits) == 0) break;
01422 
01423           uint multiplier = drd_to_multiplier[rt == ROADTYPE_TRAM ? DRD_NONE : GetDisallowedRoadDirections(tile)];
01424           if (!HasRoadWorks(tile)) trackdirbits = (TrackdirBits)(_road_trackbits[bits] * multiplier);
01425           break;
01426         }
01427 
01428         case ROAD_TILE_CROSSING: {
01429           Axis axis = GetCrossingRoadAxis(tile);
01430 
01431           if (side != INVALID_DIAGDIR && axis != DiagDirToAxis(side)) break;
01432 
01433           trackdirbits = TrackBitsToTrackdirBits(AxisToTrackBits(axis));
01434           if (IsCrossingBarred(tile)) red_signals = trackdirbits;
01435           break;
01436         }
01437 
01438         default:
01439         case ROAD_TILE_DEPOT: {
01440           DiagDirection dir = GetRoadDepotDirection(tile);
01441 
01442           if (side != INVALID_DIAGDIR && side != dir) break;
01443 
01444           trackdirbits = TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir));
01445           break;
01446         }
01447       }
01448       break;
01449 
01450     default: break;
01451   }
01452   return CombineTrackStatus(trackdirbits, red_signals);
01453 }
01454 
01455 static const StringID _road_tile_strings[] = {
01456   STR_LAI_ROAD_DESCRIPTION_ROAD,
01457   STR_LAI_ROAD_DESCRIPTION_ROAD,
01458   STR_LAI_ROAD_DESCRIPTION_ROAD,
01459   STR_LAI_ROAD_DESCRIPTION_ROAD_WITH_STREETLIGHTS,
01460   STR_LAI_ROAD_DESCRIPTION_ROAD,
01461   STR_LAI_ROAD_DESCRIPTION_TREE_LINED_ROAD,
01462   STR_LAI_ROAD_DESCRIPTION_ROAD,
01463   STR_LAI_ROAD_DESCRIPTION_ROAD,
01464 };
01465 
01466 static void GetTileDesc_Road(TileIndex tile, TileDesc *td)
01467 {
01468   Owner rail_owner = INVALID_OWNER;
01469   Owner road_owner = INVALID_OWNER;
01470   Owner tram_owner = INVALID_OWNER;
01471 
01472   switch (GetRoadTileType(tile)) {
01473     case ROAD_TILE_CROSSING: {
01474       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_RAIL_LEVEL_CROSSING;
01475       RoadTypes rts = GetRoadTypes(tile);
01476       rail_owner = GetTileOwner(tile);
01477       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01478       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01479       break;
01480     }
01481 
01482     case ROAD_TILE_DEPOT:
01483       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_VEHICLE_DEPOT;
01484       road_owner = GetTileOwner(tile); // Tile has only one owner, roadtype does not matter
01485       break;
01486 
01487     default: {
01488       RoadTypes rts = GetRoadTypes(tile);
01489       td->str = (HasBit(rts, ROADTYPE_ROAD) ? _road_tile_strings[GetRoadside(tile)] : STR_LAI_ROAD_DESCRIPTION_TRAMWAY);
01490       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01491       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01492       break;
01493     }
01494   }
01495 
01496   /* Now we have to discover, if the tile has only one owner or many:
01497    *   - Find a first_owner of the tile. (Currently road or tram must be present, but this will break when the third type becomes available)
01498    *   - Compare the found owner with the other owners, and test if they differ.
01499    * Note: If road exists it will be the first_owner.
01500    */
01501   Owner first_owner = (road_owner == INVALID_OWNER ? tram_owner : road_owner);
01502   bool mixed_owners = (tram_owner != INVALID_OWNER && tram_owner != first_owner) || (rail_owner != INVALID_OWNER && rail_owner != first_owner);
01503 
01504   if (mixed_owners) {
01505     /* Multiple owners */
01506     td->owner_type[0] = (rail_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_RAIL_OWNER);
01507     td->owner[0] = rail_owner;
01508     td->owner_type[1] = (road_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_ROAD_OWNER);
01509     td->owner[1] = road_owner;
01510     td->owner_type[2] = (tram_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_TRAM_OWNER);
01511     td->owner[2] = tram_owner;
01512   } else {
01513     /* One to rule them all */
01514     td->owner[0] = first_owner;
01515   }
01516 }
01517 
01522 static const byte _roadveh_enter_depot_dir[4] = {
01523   TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE
01524 };
01525 
01526 static VehicleEnterTileStatus VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
01527 {
01528   switch (GetRoadTileType(tile)) {
01529     case ROAD_TILE_DEPOT: {
01530       if (v->type != VEH_ROAD) break;
01531 
01532       RoadVehicle *rv = RoadVehicle::From(v);
01533       if (rv->frame == RVC_DEPOT_STOP_FRAME &&
01534           _roadveh_enter_depot_dir[GetRoadDepotDirection(tile)] == rv->state) {
01535         rv->state = RVSB_IN_DEPOT;
01536         rv->vehstatus |= VS_HIDDEN;
01537         rv->direction = ReverseDir(rv->direction);
01538         if (rv->Next() == NULL) VehicleEnterDepot(rv->First());
01539         rv->tile = tile;
01540 
01541         InvalidateWindowData(WC_VEHICLE_DEPOT, rv->tile);
01542         return VETSB_ENTERED_WORMHOLE;
01543       }
01544     } break;
01545 
01546     default: break;
01547   }
01548   return VETSB_CONTINUE;
01549 }
01550 
01551 
01552 static void ChangeTileOwner_Road(TileIndex tile, Owner old_owner, Owner new_owner)
01553 {
01554   if (IsRoadDepot(tile)) {
01555     if (GetTileOwner(tile) == old_owner) {
01556       if (new_owner == INVALID_OWNER) {
01557         DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
01558       } else {
01559         SetTileOwner(tile, new_owner);
01560       }
01561     }
01562     return;
01563   }
01564 
01565   for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
01566     /* Update all roadtypes, no matter if they are present */
01567     if (GetRoadOwner(tile, rt) == old_owner) {
01568       SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
01569     }
01570   }
01571 
01572   if (IsLevelCrossing(tile)) {
01573     if (GetTileOwner(tile) == old_owner) {
01574       if (new_owner == INVALID_OWNER) {
01575         DoCommand(tile, 0, GetCrossingRailTrack(tile), DC_EXEC | DC_BANKRUPT, CMD_REMOVE_SINGLE_RAIL);
01576       } else {
01577         SetTileOwner(tile, new_owner);
01578       }
01579     }
01580   }
01581 }
01582 
01583 static CommandCost TerraformTile_Road(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
01584 {
01585   if (_settings_game.construction.build_on_slopes && AutoslopeEnabled()) {
01586     switch (GetRoadTileType(tile)) {
01587       case ROAD_TILE_CROSSING:
01588         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]);
01589         break;
01590 
01591       case ROAD_TILE_DEPOT:
01592         if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRoadDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01593         break;
01594 
01595       case ROAD_TILE_NORMAL: {
01596         RoadBits bits = GetAllRoadBits(tile);
01597         RoadBits bits_copy = bits;
01598         /* Check if the slope-road_bits combination is valid at all, i.e. it is safe to call GetRoadFoundation(). */
01599         if (CheckRoadSlope(tileh_new, &bits_copy, ROAD_NONE, ROAD_NONE).Succeeded()) {
01600           /* CheckRoadSlope() sometimes changes the road_bits, if it does not agree with them. */
01601           if (bits == bits_copy) {
01602             uint z_old;
01603             Slope tileh_old = GetTileSlope(tile, &z_old);
01604 
01605             /* Get the slope on top of the foundation */
01606             z_old += ApplyFoundationToSlope(GetRoadFoundation(tileh_old, bits), &tileh_old);
01607             z_new += ApplyFoundationToSlope(GetRoadFoundation(tileh_new, bits), &tileh_new);
01608 
01609             /* The surface slope must not be changed */
01610             if ((z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01611           }
01612         }
01613         break;
01614       }
01615 
01616       default: NOT_REACHED();
01617     }
01618   }
01619 
01620   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
01621 }
01622 
01624 extern const TileTypeProcs _tile_type_road_procs = {
01625   DrawTile_Road,           // draw_tile_proc
01626   GetSlopeZ_Road,          // get_slope_z_proc
01627   ClearTile_Road,          // clear_tile_proc
01628   NULL,                    // add_accepted_cargo_proc
01629   GetTileDesc_Road,        // get_tile_desc_proc
01630   GetTileTrackStatus_Road, // get_tile_track_status_proc
01631   ClickTile_Road,          // click_tile_proc
01632   NULL,                    // animate_tile_proc
01633   TileLoop_Road,           // tile_loop_clear
01634   ChangeTileOwner_Road,    // change_tile_owner_clear
01635   NULL,                    // add_produced_cargo_proc
01636   VehicleEnter_Road,       // vehicle_enter_tile_proc
01637   GetFoundation_Road,      // get_foundation_proc
01638   TerraformTile_Road,      // terraform_tile_proc
01639 };

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