road_cmd.cpp

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00001 /* $Id: road_cmd.cpp 18509 2009-12-15 13:59:20Z peter1138 $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #include "stdafx.h"
00013 #include "openttd.h"
00014 #include "cmd_helper.h"
00015 #include "road_internal.h"
00016 #include "landscape.h"
00017 #include "viewport_func.h"
00018 #include "command_func.h"
00019 #include "pathfinder/yapf/yapf_cache.h"
00020 #include "depot_base.h"
00021 #include "newgrf.h"
00022 #include "variables.h"
00023 #include "autoslope.h"
00024 #include "tunnelbridge_map.h"
00025 #include "window_func.h"
00026 #include "strings_func.h"
00027 #include "vehicle_func.h"
00028 #include "sound_func.h"
00029 #include "tunnelbridge.h"
00030 #include "cheat_type.h"
00031 #include "functions.h"
00032 #include "effectvehicle_func.h"
00033 #include "elrail_func.h"
00034 #include "roadveh.h"
00035 #include "town.h"
00036 
00037 #include "table/sprites.h"
00038 #include "table/strings.h"
00039 
00044 bool RoadVehiclesAreBuilt()
00045 {
00046   const RoadVehicle *rv;
00047   FOR_ALL_ROADVEHICLES(rv) return true;
00048 
00049   return false;
00050 }
00051 
00052 #define M(x) (1 << (x))
00053 /* Level crossings may only be built on these slopes */
00054 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));
00055 #undef M
00056 
00057 /* Invalid RoadBits on slopes  */
00058 static const RoadBits _invalid_tileh_slopes_road[2][15] = {
00059   /* The inverse of the mixable RoadBits on a leveled slope */
00060   {
00061     ROAD_NONE,         // SLOPE_FLAT
00062     ROAD_NE | ROAD_SE, // SLOPE_W
00063     ROAD_NE | ROAD_NW, // SLOPE_S
00064 
00065     ROAD_NE,           // SLOPE_SW
00066     ROAD_NW | ROAD_SW, // SLOPE_E
00067     ROAD_NONE,         // SLOPE_EW
00068 
00069     ROAD_NW,           // SLOPE_SE
00070     ROAD_NONE,         // SLOPE_WSE
00071     ROAD_SE | ROAD_SW, // SLOPE_N
00072 
00073     ROAD_SE,           // SLOPE_NW
00074     ROAD_NONE,         // SLOPE_NS
00075     ROAD_NONE,         // SLOPE_ENW
00076 
00077     ROAD_SW,           // SLOPE_NE
00078     ROAD_NONE,         // SLOPE_SEN
00079     ROAD_NONE          // SLOPE_NWS
00080   },
00081   /* The inverse of the allowed straight roads on a slope
00082    * (with and without a foundation). */
00083   {
00084     ROAD_NONE, // SLOPE_FLAT
00085     ROAD_NONE, // SLOPE_W    Foundation
00086     ROAD_NONE, // SLOPE_S    Foundation
00087 
00088     ROAD_Y,    // SLOPE_SW
00089     ROAD_NONE, // SLOPE_E    Foundation
00090     ROAD_ALL,  // SLOPE_EW
00091 
00092     ROAD_X,    // SLOPE_SE
00093     ROAD_ALL,  // SLOPE_WSE
00094     ROAD_NONE, // SLOPE_N    Foundation
00095 
00096     ROAD_X,    // SLOPE_NW
00097     ROAD_ALL,  // SLOPE_NS
00098     ROAD_ALL,  // SLOPE_ENW
00099 
00100     ROAD_Y,    // SLOPE_NE
00101     ROAD_ALL,  // SLOPE_SEN
00102     ROAD_ALL   // SLOPE_NW
00103   }
00104 };
00105 
00106 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits);
00107 
00118 bool CheckAllowRemoveRoad(TileIndex tile, RoadBits remove, Owner owner, RoadType rt, DoCommandFlag flags, bool town_check)
00119 {
00120   if (_game_mode == GM_EDITOR || remove == ROAD_NONE) return true;
00121 
00122   /* Water can always flood and towns can always remove "normal" road pieces.
00123    * Towns are not be allowed to remove non "normal" road pieces, like tram
00124    * tracks as that would result in trams that cannot turn. */
00125   if (_current_company == OWNER_WATER ||
00126       (rt == ROADTYPE_ROAD && !Company::IsValidID(_current_company))) return true;
00127 
00128   /* Only do the special processing if the road is owned
00129    * by a town */
00130   if (owner != OWNER_TOWN) return (owner == OWNER_NONE) || CheckOwnership(owner);
00131 
00132   if (!town_check) return true;
00133 
00134   if (_cheats.magic_bulldozer.value) return true;
00135 
00136   Town *t = ClosestTownFromTile(tile, UINT_MAX);
00137   if (t == NULL) return true;
00138 
00139   /* check if you're allowed to remove the street owned by a town
00140    * removal allowance depends on difficulty setting */
00141   if (!CheckforTownRating(flags, t, ROAD_REMOVE)) return false;
00142 
00143   /* Get a bitmask of which neighbouring roads has a tile */
00144   RoadBits n = ROAD_NONE;
00145   RoadBits present = GetAnyRoadBits(tile, rt);
00146   if ((present & ROAD_NE) && (GetAnyRoadBits(TILE_ADDXY(tile, -1,  0), rt) & ROAD_SW)) n |= ROAD_NE;
00147   if ((present & ROAD_SE) && (GetAnyRoadBits(TILE_ADDXY(tile,  0,  1), rt) & ROAD_NW)) n |= ROAD_SE;
00148   if ((present & ROAD_SW) && (GetAnyRoadBits(TILE_ADDXY(tile,  1,  0), rt) & ROAD_NE)) n |= ROAD_SW;
00149   if ((present & ROAD_NW) && (GetAnyRoadBits(TILE_ADDXY(tile,  0, -1), rt) & ROAD_SE)) n |= ROAD_NW;
00150 
00151   int rating_decrease = RATING_ROAD_DOWN_STEP_EDGE;
00152   /* If 0 or 1 bits are set in n, or if no bits that match the bits to remove,
00153    * then allow it */
00154   if (KillFirstBit(n) != ROAD_NONE && (n & remove) != ROAD_NONE) {
00155     /* you can remove all kind of roads with extra dynamite */
00156     if (!_settings_game.construction.extra_dynamite) {
00157       SetDParam(0, t->index);
00158       _error_message = STR_ERROR_LOCAL_AUTHORITY_REFUSES_TO_ALLOW_THIS;
00159       return false;
00160     }
00161     rating_decrease = RATING_ROAD_DOWN_STEP_INNER;
00162   }
00163   ChangeTownRating(t, rating_decrease, RATING_ROAD_MINIMUM, flags);
00164 
00165   return true;
00166 }
00167 
00168 
00177 static CommandCost RemoveRoad(TileIndex tile, DoCommandFlag flags, RoadBits pieces, RoadType rt, bool crossing_check, bool town_check = true)
00178 {
00179   RoadTypes rts = GetRoadTypes(tile);
00180   /* The tile doesn't have the given road type */
00181   if (!HasBit(rts, rt)) return CMD_ERROR;
00182 
00183   switch (GetTileType(tile)) {
00184     case MP_ROAD:
00185       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00186       break;
00187 
00188     case MP_STATION:
00189       if (!IsDriveThroughStopTile(tile)) return CMD_ERROR;
00190       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00191       break;
00192 
00193     case MP_TUNNELBRIDGE:
00194       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) return CMD_ERROR;
00195       if (HasVehicleOnTunnelBridge(tile, GetOtherTunnelBridgeEnd(tile))) return CMD_ERROR;
00196       break;
00197 
00198     default:
00199       return CMD_ERROR;
00200   }
00201 
00202   if (!CheckAllowRemoveRoad(tile, pieces, GetRoadOwner(tile, rt), rt, flags, town_check)) return CMD_ERROR;
00203 
00204   if (!IsTileType(tile, MP_ROAD)) {
00205     /* If it's the last roadtype, just clear the whole tile */
00206     if (rts == RoadTypeToRoadTypes(rt)) return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00207 
00208     CommandCost cost(EXPENSES_CONSTRUCTION);
00209     if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00210       TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
00211       /* Pay for *every* tile of the bridge or tunnel */
00212       cost.AddCost((GetTunnelBridgeLength(other_end, tile) + 2) * _price[PR_CLEAR_ROAD]);
00213       if (flags & DC_EXEC) {
00214         SetRoadTypes(other_end, GetRoadTypes(other_end) & ~RoadTypeToRoadTypes(rt));
00215         SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
00216 
00217         /* If the owner of the bridge sells all it's road, also move the ownership
00218          * to the owner of the other roadtype. */
00219         RoadType other_rt = (rt == ROADTYPE_ROAD) ? ROADTYPE_TRAM : ROADTYPE_ROAD;
00220         Owner other_owner = GetRoadOwner(tile, other_rt);
00221         if (other_owner != GetTileOwner(tile)) {
00222           SetTileOwner(tile, other_owner);
00223           SetTileOwner(other_end, other_owner);
00224         }
00225 
00226         /* Mark tiles diry that have been repaved */
00227         MarkTileDirtyByTile(tile);
00228         MarkTileDirtyByTile(other_end);
00229         if (IsBridge(tile)) {
00230           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
00231 
00232           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
00233         }
00234       }
00235     } else {
00236       assert(IsDriveThroughStopTile(tile));
00237       cost.AddCost(_price[PR_CLEAR_ROAD] * 2);
00238       if (flags & DC_EXEC) {
00239         SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
00240         MarkTileDirtyByTile(tile);
00241       }
00242     }
00243     return cost;
00244   }
00245 
00246   switch (GetRoadTileType(tile)) {
00247     case ROAD_TILE_NORMAL: {
00248       const Slope tileh = GetTileSlope(tile, NULL);
00249       RoadBits present = GetRoadBits(tile, rt);
00250       const RoadBits other = GetOtherRoadBits(tile, rt);
00251       const Foundation f = GetRoadFoundation(tileh, present);
00252 
00253       if (HasRoadWorks(tile) && _current_company != OWNER_WATER) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00254 
00255       /* Autocomplete to a straight road
00256        * @li on steep slopes
00257        * @li if the bits of the other roadtypes result in another foundation
00258        * @li if build on slopes is disabled */
00259       if (IsSteepSlope(tileh) || (IsStraightRoad(other) &&
00260           (other & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) != ROAD_NONE) ||
00261           (tileh != SLOPE_FLAT && !_settings_game.construction.build_on_slopes)) {
00262         pieces |= MirrorRoadBits(pieces);
00263       }
00264 
00265       /* limit the bits to delete to the existing bits. */
00266       pieces &= present;
00267       if (pieces == ROAD_NONE) return CMD_ERROR;
00268 
00269       /* Now set present what it will be after the remove */
00270       present ^= pieces;
00271 
00272       /* Check for invalid RoadBit combinations on slopes */
00273       if (tileh != SLOPE_FLAT && present != ROAD_NONE &&
00274           (present & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) == present) {
00275         return CMD_ERROR;
00276       }
00277 
00278       if (flags & DC_EXEC) {
00279         if (HasRoadWorks(tile)) {
00280           /* flooding tile with road works, don't forget to remove the effect vehicle too */
00281           assert(_current_company == OWNER_WATER);
00282           EffectVehicle *v;
00283           FOR_ALL_EFFECTVEHICLES(v) {
00284             if (TileVirtXY(v->x_pos, v->y_pos) == tile) {
00285               delete v;
00286             }
00287           }
00288         }
00289         if (present == ROAD_NONE) {
00290           RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));
00291           if (rts == ROADTYPES_NONE) {
00292             /* Includes MarkTileDirtyByTile() */
00293             DoClearSquare(tile);
00294           } else {
00295             if (rt == ROADTYPE_ROAD && IsRoadOwner(tile, ROADTYPE_ROAD, OWNER_TOWN)) {
00296               /* Update nearest-town index */
00297               const Town *town = CalcClosestTownFromTile(tile);
00298               SetTownIndex(tile, town == NULL ? (TownID)INVALID_TOWN : town->index);
00299             }
00300             SetRoadBits(tile, ROAD_NONE, rt);
00301             SetRoadTypes(tile, rts);
00302             MarkTileDirtyByTile(tile);
00303           }
00304         } else {
00305           /* When bits are removed, you *always* end up with something that
00306            * is not a complete straight road tile. However, trams do not have
00307            * onewayness, so they cannot remove it either. */
00308           if (rt != ROADTYPE_TRAM) SetDisallowedRoadDirections(tile, DRD_NONE);
00309           SetRoadBits(tile, present, rt);
00310           MarkTileDirtyByTile(tile);
00311         }
00312       }
00313 
00314       /* If we change the foundation we have to pay for it. */
00315       return CommandCost(EXPENSES_CONSTRUCTION, CountBits(pieces) * _price[PR_CLEAR_ROAD] +
00316           ((GetRoadFoundation(tileh, present) != f) ? _price[PR_BUILD_FOUNDATION] : (Money)0));
00317     }
00318 
00319     case ROAD_TILE_CROSSING: {
00320       if (pieces & ComplementRoadBits(GetCrossingRoadBits(tile))) {
00321         return CMD_ERROR;
00322       }
00323 
00324       /* Don't allow road to be removed from the crossing when there is tram;
00325        * we can't draw the crossing without roadbits ;) */
00326       if (rt == ROADTYPE_ROAD && HasTileRoadType(tile, ROADTYPE_TRAM) && (flags & DC_EXEC || crossing_check)) return CMD_ERROR;
00327 
00328       if (flags & DC_EXEC) {
00329         Track railtrack = GetCrossingRailTrack(tile);
00330         RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));
00331         if (rts == ROADTYPES_NONE) {
00332           TrackBits tracks = GetCrossingRailBits(tile);
00333           bool reserved = HasCrossingReservation(tile);
00334           MakeRailNormal(tile, GetTileOwner(tile), tracks, GetRailType(tile));
00335           if (reserved) SetTrackReservation(tile, tracks);
00336         } else {
00337           SetRoadTypes(tile, rts);
00338           /* If we ever get HWAY and it is possible without road then we will need to promote ownership and invalidate town index here, too */
00339         }
00340         MarkTileDirtyByTile(tile);
00341         YapfNotifyTrackLayoutChange(tile, railtrack);
00342       }
00343       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_ROAD] * 2);
00344     }
00345 
00346     default:
00347     case ROAD_TILE_DEPOT:
00348       return CMD_ERROR;
00349   }
00350 }
00351 
00352 
00362 CommandCost CmdRemoveRoad(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00363 {
00364   RoadType rt = (RoadType)GB(p1, 4, 2);
00365   if (!IsValidRoadType(rt)) return CMD_ERROR;
00366 
00367   RoadBits pieces = Extract<RoadBits, 0>(p1);
00368 
00369   return RemoveRoad(tile, flags, pieces, rt, true);
00370 }
00371 
00383 static CommandCost CheckRoadSlope(Slope tileh, RoadBits *pieces, RoadBits existing, RoadBits other)
00384 {
00385   /* Remove already build pieces */
00386   CLRBITS(*pieces, existing);
00387 
00388   /* If we can't build anything stop here */
00389   if (*pieces == ROAD_NONE) return CMD_ERROR;
00390 
00391   /* All RoadBit combos are valid on flat land */
00392   if (tileh == SLOPE_FLAT) return CommandCost();
00393 
00394   /* Proceed steep Slopes first to reduce lookup table size */
00395   if (IsSteepSlope(tileh)) {
00396     /* Force straight roads. */
00397     *pieces |= MirrorRoadBits(*pieces);
00398 
00399     /* Use existing as all existing since only straight
00400      * roads are allowed here. */
00401     existing |= other;
00402 
00403     if ((existing == ROAD_NONE || existing == *pieces) && IsStraightRoad(*pieces)) {
00404       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00405     }
00406     return CMD_ERROR;
00407   }
00408 
00409   /* Save the merge of all bits of the current type */
00410   RoadBits type_bits = existing | *pieces;
00411 
00412   /* Roads on slopes */
00413   if (_settings_game.construction.build_on_slopes && (_invalid_tileh_slopes_road[0][tileh] & (other | type_bits)) == ROAD_NONE) {
00414 
00415     /* If we add leveling we've got to pay for it */
00416     if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00417 
00418     return CommandCost();
00419   }
00420 
00421   /* Autocomplete uphill roads */
00422   *pieces |= MirrorRoadBits(*pieces);
00423   type_bits = existing | *pieces;
00424 
00425   /* Uphill roads */
00426   if (IsStraightRoad(type_bits) && (other == type_bits || other == ROAD_NONE) &&
00427       (_invalid_tileh_slopes_road[1][tileh] & (other | type_bits)) == ROAD_NONE) {
00428 
00429     /* Slopes with foundation ? */
00430     if (IsSlopeWithOneCornerRaised(tileh)) {
00431 
00432       /* Prevent build on slopes if it isn't allowed */
00433       if (_settings_game.construction.build_on_slopes) {
00434 
00435         /* If we add foundation we've got to pay for it */
00436         if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00437 
00438         return CommandCost();
00439       }
00440     } else {
00441       if (CountBits(existing) == 1) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00442       return CommandCost();
00443     }
00444   }
00445   return CMD_ERROR;
00446 }
00447 
00458 CommandCost CmdBuildRoad(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00459 {
00460   CommandCost cost(EXPENSES_CONSTRUCTION);
00461 
00462   RoadBits existing = ROAD_NONE;
00463   RoadBits other_bits = ROAD_NONE;
00464 
00465   /* Road pieces are max 4 bitset values (NE, NW, SE, SW) and town can only be non-zero
00466    * if a non-company is building the road */
00467   if ((Company::IsValidID(_current_company) && p2 != 0) || (_current_company == OWNER_TOWN && !Town::IsValidID(p2))) return CMD_ERROR;
00468   if (_current_company != OWNER_TOWN) {
00469     const Town *town = CalcClosestTownFromTile(tile);
00470     p2 = (town != NULL) ? town->index : (TownID)INVALID_TOWN;
00471   }
00472 
00473   RoadBits pieces = Extract<RoadBits, 0>(p1);
00474 
00475   /* do not allow building 'zero' road bits, code wouldn't handle it */
00476   if (pieces == ROAD_NONE) return CMD_ERROR;
00477 
00478   RoadType rt = (RoadType)GB(p1, 4, 2);
00479   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00480 
00481   DisallowedRoadDirections toggle_drd = (DisallowedRoadDirections)GB(p1, 6, 2);
00482 
00483   Slope tileh = GetTileSlope(tile, NULL);
00484 
00485   switch (GetTileType(tile)) {
00486     case MP_ROAD:
00487       switch (GetRoadTileType(tile)) {
00488         case ROAD_TILE_NORMAL: {
00489           if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00490 
00491           other_bits = GetOtherRoadBits(tile, rt);
00492           if (!HasTileRoadType(tile, rt)) break;
00493 
00494           existing = GetRoadBits(tile, rt);
00495           bool crossing = !IsStraightRoad(existing | pieces);
00496           if (rt != ROADTYPE_TRAM && (GetDisallowedRoadDirections(tile) != DRD_NONE || toggle_drd != DRD_NONE) && crossing) {
00497             /* Junctions cannot be one-way */
00498             return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
00499           }
00500           if ((existing & pieces) == pieces) {
00501             /* We only want to set the (dis)allowed road directions */
00502             if (toggle_drd != DRD_NONE && rt != ROADTYPE_TRAM) {
00503               if (crossing) return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
00504 
00505               Owner owner = GetRoadOwner(tile, ROADTYPE_ROAD);
00506               if (owner != OWNER_NONE && !CheckOwnership(owner)) return CMD_ERROR;
00507 
00508               if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00509 
00510               /* Ignore half built tiles */
00511               if ((flags & DC_EXEC) && rt != ROADTYPE_TRAM && IsStraightRoad(existing)) {
00512                 SetDisallowedRoadDirections(tile, GetDisallowedRoadDirections(tile) ^ toggle_drd);
00513                 MarkTileDirtyByTile(tile);
00514               }
00515               return CommandCost();
00516             }
00517             return_cmd_error(STR_ERROR_ALREADY_BUILT);
00518           }
00519         } break;
00520 
00521         case ROAD_TILE_CROSSING:
00522           other_bits = GetCrossingRoadBits(tile);
00523           if (pieces & ComplementRoadBits(other_bits)) goto do_clear;
00524           pieces = other_bits; // we need to pay for both roadbits
00525 
00526           if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00527           break;
00528 
00529         case ROAD_TILE_DEPOT:
00530           if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00531           goto do_clear;
00532 
00533         default: NOT_REACHED();
00534       }
00535       break;
00536 
00537     case MP_RAILWAY: {
00538       if (IsSteepSlope(tileh)) {
00539         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00540       }
00541 
00542       /* Level crossings may only be built on these slopes */
00543       if (!HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh)) {
00544         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00545       }
00546 
00547       if (GetRailTileType(tile) != RAIL_TILE_NORMAL) goto do_clear;
00548 
00549       Axis roaddir;
00550       switch (GetTrackBits(tile)) {
00551         case TRACK_BIT_X:
00552           if (pieces & ROAD_X) goto do_clear;
00553           roaddir = AXIS_Y;
00554           break;
00555 
00556         case TRACK_BIT_Y:
00557           if (pieces & ROAD_Y) goto do_clear;
00558           roaddir = AXIS_X;
00559           break;
00560 
00561         default: goto do_clear;
00562       }
00563 
00564       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00565 
00566       if (flags & DC_EXEC) {
00567         Track railtrack = AxisToTrack(OtherAxis(roaddir));
00568         YapfNotifyTrackLayoutChange(tile, railtrack);
00569         /* Always add road to the roadtypes (can't draw without it) */
00570         bool reserved = HasBit(GetRailReservationTrackBits(tile), railtrack);
00571         MakeRoadCrossing(tile, _current_company, _current_company, GetTileOwner(tile), roaddir, GetRailType(tile), RoadTypeToRoadTypes(rt) | ROADTYPES_ROAD, p2);
00572         SetCrossingReservation(tile, reserved);
00573         UpdateLevelCrossing(tile, false);
00574         MarkTileDirtyByTile(tile);
00575       }
00576       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_ROAD] * (rt == ROADTYPE_ROAD ? 2 : 4));
00577     }
00578 
00579     case MP_STATION: {
00580       if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00581       if (!IsDriveThroughStopTile(tile)) goto do_clear;
00582 
00583       RoadBits curbits = AxisToRoadBits(DiagDirToAxis(GetRoadStopDir(tile)));
00584       if (pieces & ~curbits) goto do_clear;
00585       pieces = curbits; // we need to pay for both roadbits
00586 
00587       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00588     } break;
00589 
00590     case MP_TUNNELBRIDGE:
00591       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) goto do_clear;
00592       if (MirrorRoadBits(DiagDirToRoadBits(GetTunnelBridgeDirection(tile))) != pieces) goto do_clear;
00593       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00594       /* Don't allow adding roadtype to the bridge/tunnel when vehicles are already driving on it */
00595       if (HasVehicleOnTunnelBridge(tile, GetOtherTunnelBridgeEnd(tile))) return CMD_ERROR;
00596       break;
00597 
00598     default: {
00599 do_clear:;
00600       CommandCost ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00601       if (CmdFailed(ret)) return ret;
00602       cost.AddCost(ret);
00603     } break;
00604   }
00605 
00606   if (other_bits != pieces) {
00607     /* Check the foundation/slopes when adding road/tram bits */
00608     CommandCost ret = CheckRoadSlope(tileh, &pieces, existing, other_bits);
00609     /* Return an error if we need to build a foundation (ret != 0) but the
00610      * current setting is turned off */
00611     if (CmdFailed(ret) || (ret.GetCost() != 0 && !_settings_game.construction.build_on_slopes)) {
00612       return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00613     }
00614     cost.AddCost(ret);
00615   }
00616 
00617   if (IsTileType(tile, MP_ROAD)) {
00618     /* Don't put the pieces that already exist */
00619     pieces &= ComplementRoadBits(existing);
00620 
00621     /* Check if new road bits will have the same foundation as other existing road types */
00622     if (IsNormalRoad(tile)) {
00623       Slope slope = GetTileSlope(tile, NULL);
00624       Foundation found_new = GetRoadFoundation(slope, pieces | existing);
00625 
00626       /* Test if all other roadtypes can be built at that foundation */
00627       for (RoadType rtest = ROADTYPE_ROAD; rtest < ROADTYPE_END; rtest++) {
00628         if (rtest != rt) { // check only other road types
00629           RoadBits bits = GetRoadBits(tile, rtest);
00630           /* do not check if there are not road bits of given type */
00631           if (bits != ROAD_NONE && GetRoadFoundation(slope, bits) != found_new) {
00632             return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00633           }
00634         }
00635       }
00636     }
00637   }
00638 
00639   if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00640 
00641   cost.AddCost(CountBits(pieces) * _price[PR_BUILD_ROAD]);
00642   if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00643     /* Pay for *every* tile of the bridge or tunnel */
00644     cost.MultiplyCost(GetTunnelBridgeLength(GetOtherTunnelBridgeEnd(tile), tile) + 2);
00645   }
00646 
00647   if (flags & DC_EXEC) {
00648     switch (GetTileType(tile)) {
00649       case MP_ROAD: {
00650         RoadTileType rtt = GetRoadTileType(tile);
00651         if (existing == ROAD_NONE || rtt == ROAD_TILE_CROSSING) {
00652           SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00653           SetRoadOwner(tile, rt, _current_company);
00654           if (rt == ROADTYPE_ROAD) SetTownIndex(tile, p2);
00655         }
00656         if (rtt != ROAD_TILE_CROSSING) SetRoadBits(tile, existing | pieces, rt);
00657       } break;
00658 
00659       case MP_TUNNELBRIDGE: {
00660         TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
00661 
00662         SetRoadTypes(other_end, GetRoadTypes(other_end) | RoadTypeToRoadTypes(rt));
00663         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00664         SetRoadOwner(other_end, rt, _current_company);
00665         SetRoadOwner(tile, rt, _current_company);
00666 
00667         /* Mark tiles diry that have been repaved */
00668         MarkTileDirtyByTile(other_end);
00669         MarkTileDirtyByTile(tile);
00670         if (IsBridge(tile)) {
00671           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
00672 
00673           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
00674         }
00675       } break;
00676 
00677       case MP_STATION:
00678         assert(IsDriveThroughStopTile(tile));
00679         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00680         SetRoadOwner(tile, rt, _current_company);
00681         break;
00682 
00683       default:
00684         MakeRoadNormal(tile, pieces, RoadTypeToRoadTypes(rt), p2, _current_company, _current_company);
00685         break;
00686     }
00687 
00688     if (rt != ROADTYPE_TRAM && IsNormalRoadTile(tile)) {
00689       existing |= pieces;
00690       SetDisallowedRoadDirections(tile, IsStraightRoad(existing) ?
00691           GetDisallowedRoadDirections(tile) ^ toggle_drd : DRD_NONE);
00692     }
00693 
00694     MarkTileDirtyByTile(tile);
00695   }
00696   return cost;
00697 }
00698 
00712 CommandCost CmdBuildLongRoad(TileIndex end_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00713 {
00714   CommandCost cost(EXPENSES_CONSTRUCTION);
00715   bool had_bridge = false;
00716   bool had_tunnel = false;
00717   bool had_success = false;
00718   DisallowedRoadDirections drd = DRD_NORTHBOUND;
00719 
00720   _error_message = INVALID_STRING_ID;
00721 
00722   if (p1 >= MapSize()) return CMD_ERROR;
00723 
00724   TileIndex start_tile = p1;
00725   RoadType rt = (RoadType)GB(p2, 3, 2);
00726   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00727 
00728   /* Only drag in X or Y direction dictated by the direction variable */
00729   if (!HasBit(p2, 2) && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00730   if (HasBit(p2, 2)  && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00731 
00732   /* Swap start and ending tile, also the half-tile drag var (bit 0 and 1) */
00733   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00734     TileIndex t = start_tile;
00735     start_tile = end_tile;
00736     end_tile = t;
00737     p2 ^= IsInsideMM(p2 & 3, 1, 3) ? 3 : 0;
00738     drd = DRD_SOUTHBOUND;
00739   }
00740 
00741   /* On the X-axis, we have to swap the initial bits, so they
00742    * will be interpreted correctly in the GTTS. Futhermore
00743    * when you just 'click' on one tile to build them. */
00744   if (HasBit(p2, 2) == (start_tile == end_tile && HasBit(p2, 0) == HasBit(p2, 1))) drd ^= DRD_BOTH;
00745   /* No disallowed direction bits have to be toggled */
00746   if (!HasBit(p2, 5)) drd = DRD_NONE;
00747 
00748   TileIndex tile = start_tile;
00749   /* Start tile is the small number. */
00750   for (;;) {
00751     RoadBits bits = HasBit(p2, 2) ? ROAD_Y : ROAD_X;
00752 
00753     if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
00754     if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
00755 
00756     _error_message = INVALID_STRING_ID;
00757     CommandCost ret = DoCommand(tile, drd << 6 | rt << 4 | bits, 0, flags, CMD_BUILD_ROAD);
00758     if (CmdFailed(ret)) {
00759       if (_error_message != STR_ERROR_ALREADY_BUILT) return CMD_ERROR;
00760     } else {
00761       had_success = true;
00762       /* Only pay for the upgrade on one side of the bridges and tunnels */
00763       if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00764         if (IsBridge(tile)) {
00765           if ((!had_bridge || GetTunnelBridgeDirection(tile) == DIAGDIR_SE || GetTunnelBridgeDirection(tile) == DIAGDIR_SW)) {
00766             cost.AddCost(ret);
00767           }
00768           had_bridge = true;
00769         } else { // IsTunnel(tile)
00770           if ((!had_tunnel || GetTunnelBridgeDirection(tile) == DIAGDIR_SE || GetTunnelBridgeDirection(tile) == DIAGDIR_SW)) {
00771             cost.AddCost(ret);
00772           }
00773           had_tunnel = true;
00774         }
00775       } else {
00776         cost.AddCost(ret);
00777       }
00778     }
00779 
00780     if (tile == end_tile) break;
00781 
00782     tile += HasBit(p2, 2) ? TileDiffXY(0, 1) : TileDiffXY(1, 0);
00783   }
00784 
00785   return !had_success ? CMD_ERROR : cost;
00786 }
00787 
00800 CommandCost CmdRemoveLongRoad(TileIndex end_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00801 {
00802   CommandCost cost(EXPENSES_CONSTRUCTION);
00803 
00804   if (p1 >= MapSize()) return CMD_ERROR;
00805 
00806   TileIndex start_tile = p1;
00807   RoadType rt = (RoadType)GB(p2, 3, 2);
00808   if (!IsValidRoadType(rt)) return CMD_ERROR;
00809 
00810   /* Only drag in X or Y direction dictated by the direction variable */
00811   if (!HasBit(p2, 2) && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00812   if (HasBit(p2, 2)  && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00813 
00814   /* Swap start and ending tile, also the half-tile drag var (bit 0 and 1) */
00815   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00816     TileIndex t = start_tile;
00817     start_tile = end_tile;
00818     end_tile = t;
00819     p2 ^= IsInsideMM(p2 & 3, 1, 3) ? 3 : 0;
00820   }
00821 
00822   Money money = GetAvailableMoneyForCommand();
00823   TileIndex tile = start_tile;
00824   /* Start tile is the small number. */
00825   for (;;) {
00826     RoadBits bits = HasBit(p2, 2) ? ROAD_Y : ROAD_X;
00827 
00828     if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
00829     if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
00830 
00831     /* try to remove the halves. */
00832     if (bits != 0) {
00833       CommandCost ret = RemoveRoad(tile, flags & ~DC_EXEC, bits, rt, true);
00834       if (CmdSucceeded(ret)) {
00835         if (flags & DC_EXEC) {
00836           money -= ret.GetCost();
00837           if (money < 0) {
00838             _additional_cash_required = DoCommand(end_tile, start_tile, p2, flags & ~DC_EXEC, CMD_REMOVE_LONG_ROAD).GetCost();
00839             return cost;
00840           }
00841           RemoveRoad(tile, flags, bits, rt, true, false);
00842         }
00843         cost.AddCost(ret);
00844       }
00845     }
00846 
00847     if (tile == end_tile) break;
00848 
00849     tile += HasBit(p2, 2) ? TileDiffXY(0, 1) : TileDiffXY(1, 0);
00850   }
00851 
00852   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
00853 }
00854 
00867 CommandCost CmdBuildRoadDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00868 {
00869   DiagDirection dir = Extract<DiagDirection, 0>(p1);
00870   RoadType rt = (RoadType)GB(p1, 2, 2);
00871 
00872   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00873 
00874   Slope tileh = GetTileSlope(tile, NULL);
00875   if (tileh != SLOPE_FLAT && (
00876         !_settings_game.construction.build_on_slopes ||
00877         IsSteepSlope(tileh) ||
00878         !CanBuildDepotByTileh(dir, tileh)
00879       )) {
00880     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00881   }
00882 
00883   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00884   if (CmdFailed(cost)) return CMD_ERROR;
00885 
00886   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
00887 
00888   if (!Depot::CanAllocateItem()) return CMD_ERROR;
00889 
00890   if (flags & DC_EXEC) {
00891     Depot *dep = new Depot(tile);
00892     dep->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
00893 
00894     MakeRoadDepot(tile, _current_company, dep->index, dir, rt);
00895     MarkTileDirtyByTile(tile);
00896   }
00897   return cost.AddCost(_price[PR_BUILD_DEPOT_ROAD]);
00898 }
00899 
00900 static CommandCost RemoveRoadDepot(TileIndex tile, DoCommandFlag flags)
00901 {
00902   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER) return CMD_ERROR;
00903 
00904   if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00905 
00906   if (flags & DC_EXEC) {
00907     delete Depot::GetByTile(tile);
00908     DoClearSquare(tile);
00909   }
00910 
00911   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_ROAD]);
00912 }
00913 
00914 static CommandCost ClearTile_Road(TileIndex tile, DoCommandFlag flags)
00915 {
00916   switch (GetRoadTileType(tile)) {
00917     case ROAD_TILE_NORMAL: {
00918       RoadBits b = GetAllRoadBits(tile);
00919 
00920       /* Clear the road if only one piece is on the tile OR we are not using the DC_AUTO flag */
00921       if ((CountBits(b) == 1 && GetRoadBits(tile, ROADTYPE_TRAM) == ROAD_NONE) || !(flags & DC_AUTO)) {
00922         RoadTypes rts = GetRoadTypes(tile);
00923         CommandCost ret(EXPENSES_CONSTRUCTION);
00924         for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
00925           if (HasBit(rts, rt)) {
00926             CommandCost tmp_ret = RemoveRoad(tile, flags, GetRoadBits(tile, rt), rt, true);
00927             if (CmdFailed(tmp_ret)) return tmp_ret;
00928             ret.AddCost(tmp_ret);
00929           }
00930         }
00931         return ret;
00932       }
00933       return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
00934     }
00935 
00936     case ROAD_TILE_CROSSING: {
00937       RoadTypes rts = GetRoadTypes(tile);
00938       CommandCost ret(EXPENSES_CONSTRUCTION);
00939 
00940       if (flags & DC_AUTO) return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
00941 
00942       /* Must iterate over the roadtypes in a reverse manner because
00943        * tram tracks must be removed before the road bits. */
00944       RoadType rt = ROADTYPE_TRAM;
00945       do {
00946         if (HasBit(rts, rt)) {
00947           CommandCost tmp_ret = RemoveRoad(tile, flags, GetCrossingRoadBits(tile), rt, false);
00948           if (CmdFailed(tmp_ret)) return tmp_ret;
00949           ret.AddCost(tmp_ret);
00950         }
00951       } while (rt-- != ROADTYPE_ROAD);
00952 
00953       if (flags & DC_EXEC) {
00954         DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00955       }
00956       return ret;
00957     }
00958 
00959     default:
00960     case ROAD_TILE_DEPOT:
00961       if (flags & DC_AUTO) {
00962         return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
00963       }
00964       return RemoveRoadDepot(tile, flags);
00965   }
00966 }
00967 
00968 
00969 struct DrawRoadTileStruct {
00970   uint16 image;
00971   byte subcoord_x;
00972   byte subcoord_y;
00973 };
00974 
00975 #include "table/road_land.h"
00976 
00984 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits)
00985 {
00986   /* Flat land and land without a road doesn't require a foundation */
00987   if (tileh == SLOPE_FLAT || bits == ROAD_NONE) return FOUNDATION_NONE;
00988 
00989   if (!IsSteepSlope(tileh)) {
00990     /* Leveled RoadBits on a slope */
00991     if ((_invalid_tileh_slopes_road[0][tileh] & bits) == ROAD_NONE) return FOUNDATION_LEVELED;
00992 
00993     /* Straight roads without foundation on a slope */
00994     if (!IsSlopeWithOneCornerRaised(tileh) &&
00995         (_invalid_tileh_slopes_road[1][tileh] & bits) == ROAD_NONE)
00996       return FOUNDATION_NONE;
00997   }
00998 
00999   /* Roads on steep Slopes or on Slopes with one corner raised */
01000   return (bits == ROAD_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
01001 }
01002 
01003 const byte _road_sloped_sprites[14] = {
01004   0,  0,  2,  0,
01005   0,  1,  0,  0,
01006   3,  0,  0,  0,
01007   0,  0
01008 };
01009 
01020 static bool AlwaysDrawUnpavedRoads(TileIndex tile, Roadside roadside)
01021 {
01022   return (IsOnSnow(tile) &&
01023       !(_settings_game.game_creation.landscape == LT_TROPIC && HasGrfMiscBit(GMB_DESERT_PAVED_ROADS) &&
01024         roadside != ROADSIDE_BARREN && roadside != ROADSIDE_GRASS && roadside != ROADSIDE_GRASS_ROAD_WORKS));
01025 }
01026 
01032 void DrawTramCatenary(const TileInfo *ti, RoadBits tram)
01033 {
01034   /* Do not draw catenary if it is invisible */
01035   if (IsInvisibilitySet(TO_CATENARY)) return;
01036 
01037   /* Don't draw the catenary under a low bridge */
01038   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_CATENARY)) {
01039     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01040 
01041     if (height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) return;
01042   }
01043 
01044   SpriteID front;
01045   SpriteID back;
01046 
01047   if (ti->tileh != SLOPE_FLAT) {
01048     back  = SPR_TRAMWAY_BACK_WIRES_SLOPED  + _road_sloped_sprites[ti->tileh - 1];
01049     front = SPR_TRAMWAY_FRONT_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
01050   } else {
01051     back  = SPR_TRAMWAY_BASE + _road_backpole_sprites_1[tram];
01052     front = SPR_TRAMWAY_BASE + _road_frontwire_sprites_1[tram];
01053   }
01054 
01055   AddSortableSpriteToDraw(back,  PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01056   AddSortableSpriteToDraw(front, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01057 }
01058 
01067 static void DrawRoadDetail(SpriteID img, const TileInfo *ti, int dx, int dy, int h)
01068 {
01069   int x = ti->x | dx;
01070   int y = ti->y | dy;
01071   byte z = ti->z;
01072   if (ti->tileh != SLOPE_FLAT) z = GetSlopeZ(x, y);
01073   AddSortableSpriteToDraw(img, PAL_NONE, x, y, 2, 2, h, z);
01074 }
01075 
01080 static void DrawRoadBits(TileInfo *ti)
01081 {
01082   RoadBits road = GetRoadBits(ti->tile, ROADTYPE_ROAD);
01083   RoadBits tram = GetRoadBits(ti->tile, ROADTYPE_TRAM);
01084 
01085   SpriteID image = 0;
01086   SpriteID pal = PAL_NONE;
01087 
01088   if (ti->tileh != SLOPE_FLAT) {
01089     DrawFoundation(ti, GetRoadFoundation(ti->tileh, road | tram));
01090 
01091     /* DrawFoundation() modifies ti.
01092      * Default sloped sprites.. */
01093     if (ti->tileh != SLOPE_FLAT) image = _road_sloped_sprites[ti->tileh - 1] + 0x53F;
01094   }
01095 
01096   if (image == 0) image = _road_tile_sprites_1[road != ROAD_NONE ? road : tram];
01097 
01098   Roadside roadside = GetRoadside(ti->tile);
01099 
01100   if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01101     image += 19;
01102   } else {
01103     switch (roadside) {
01104       case ROADSIDE_BARREN:           pal = PALETTE_TO_BARE_LAND; break;
01105       case ROADSIDE_GRASS:            break;
01106       case ROADSIDE_GRASS_ROAD_WORKS: break;
01107       default:                        image -= 19; break; // Paved
01108     }
01109   }
01110 
01111   DrawGroundSprite(image, pal);
01112 
01113   /* For tram we overlay the road graphics with either tram tracks only
01114    * (when there is actual road beneath the trams) or with tram tracks
01115    * and some dirts which hides the road graphics */
01116   if (tram != ROAD_NONE) {
01117     if (ti->tileh != SLOPE_FLAT) {
01118       image = _road_sloped_sprites[ti->tileh - 1] + SPR_TRAMWAY_SLOPED_OFFSET;
01119     } else {
01120       image = _road_tile_sprites_1[tram] - SPR_ROAD_Y;
01121     }
01122     image += (road == ROAD_NONE) ? SPR_TRAMWAY_TRAM : SPR_TRAMWAY_OVERLAY;
01123     DrawGroundSprite(image, pal);
01124   }
01125 
01126   if (road != ROAD_NONE) {
01127     DisallowedRoadDirections drd = GetDisallowedRoadDirections(ti->tile);
01128     if (drd != DRD_NONE) {
01129       DrawRoadDetail(SPR_ONEWAY_BASE + drd - 1 + ((road == ROAD_X) ? 0 : 3), ti, 8, 8, 0);
01130     }
01131   }
01132 
01133   if (HasRoadWorks(ti->tile)) {
01134     /* Road works */
01135     DrawGroundSprite((road | tram) & ROAD_X ? SPR_EXCAVATION_X : SPR_EXCAVATION_Y, PAL_NONE);
01136     return;
01137   }
01138 
01139   if (tram != ROAD_NONE) DrawTramCatenary(ti, tram);
01140 
01141   /* Return if full detail is disabled, or we are zoomed fully out. */
01142   if (!HasBit(_display_opt, DO_FULL_DETAIL) || _cur_dpi->zoom > ZOOM_LVL_DETAIL) return;
01143 
01144   /* Do not draw details (street lights, trees) under low bridge */
01145   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && (roadside == ROADSIDE_TREES || roadside == ROADSIDE_STREET_LIGHTS)) {
01146     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01147     uint minz = GetTileMaxZ(ti->tile) + 2 * TILE_HEIGHT;
01148 
01149     if (roadside == ROADSIDE_TREES) minz += TILE_HEIGHT;
01150 
01151     if (height < minz) return;
01152   }
01153 
01154   /* If there are no road bits, return, as there is nothing left to do */
01155   if (CountBits(road) < 2) return;
01156 
01157   /* Draw extra details. */
01158   for (const DrawRoadTileStruct *drts = _road_display_table[roadside][road | tram]; drts->image != 0; drts++) {
01159     DrawRoadDetail(drts->image, ti, drts->subcoord_x, drts->subcoord_y, 0x10);
01160   }
01161 }
01162 
01164 static void DrawTile_Road(TileInfo *ti)
01165 {
01166   switch (GetRoadTileType(ti->tile)) {
01167     case ROAD_TILE_NORMAL:
01168       DrawRoadBits(ti);
01169       break;
01170 
01171     case ROAD_TILE_CROSSING: {
01172       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01173 
01174       SpriteID image = GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.crossing;
01175       SpriteID pal = PAL_NONE;
01176 
01177       if (GetCrossingRoadAxis(ti->tile) == AXIS_X) image++;
01178       if (IsCrossingBarred(ti->tile)) image += 2;
01179 
01180       Roadside roadside = GetRoadside(ti->tile);
01181 
01182       if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01183         image += 8;
01184       } else {
01185         switch (roadside) {
01186           case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
01187           case ROADSIDE_GRASS:  break;
01188           default:              image += 4; break; // Paved
01189         }
01190       }
01191 
01192       DrawGroundSprite(image, pal);
01193 
01194       /* PBS debugging, draw reserved tracks darker */
01195       if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) {
01196         DrawGroundSprite(GetCrossingRoadAxis(ti->tile) == AXIS_Y ? GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_x : GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_y, PALETTE_CRASH);
01197       }
01198 
01199       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01200         DrawGroundSprite(SPR_TRAMWAY_OVERLAY + (GetCrossingRoadAxis(ti->tile) ^ 1), pal);
01201         DrawTramCatenary(ti, GetCrossingRoadBits(ti->tile));
01202       }
01203       if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01204       break;
01205     }
01206 
01207     default:
01208     case ROAD_TILE_DEPOT: {
01209       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01210 
01211       SpriteID palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
01212 
01213       const DrawTileSprites *dts;
01214       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01215         dts =  &_tram_depot[GetRoadDepotDirection(ti->tile)];
01216       } else {
01217         dts =  &_road_depot[GetRoadDepotDirection(ti->tile)];
01218       }
01219 
01220       DrawGroundSprite(dts->ground.sprite, PAL_NONE);
01221 
01222       /* End now if buildings are invisible */
01223       if (IsInvisibilitySet(TO_BUILDINGS)) break;
01224 
01225       for (const DrawTileSeqStruct *dtss = dts->seq; dtss->image.sprite != 0; dtss++) {
01226         SpriteID image = dtss->image.sprite;
01227         SpriteID pal;
01228 
01229         if (!IsTransparencySet(TO_BUILDINGS) && HasBit(image, PALETTE_MODIFIER_COLOUR)) {
01230           pal = palette;
01231         } else {
01232           pal = PAL_NONE;
01233         }
01234 
01235         AddSortableSpriteToDraw(
01236           image, pal,
01237           ti->x + dtss->delta_x, ti->y + dtss->delta_y,
01238           dtss->size_x, dtss->size_y,
01239           dtss->size_z, ti->z,
01240           IsTransparencySet(TO_BUILDINGS)
01241         );
01242       }
01243       break;
01244     }
01245   }
01246   DrawBridgeMiddle(ti);
01247 }
01248 
01249 void DrawRoadDepotSprite(int x, int y, DiagDirection dir, RoadType rt)
01250 {
01251   SpriteID palette = COMPANY_SPRITE_COLOUR(_local_company);
01252   const DrawTileSprites *dts = (rt == ROADTYPE_TRAM) ? &_tram_depot[dir] : &_road_depot[dir];
01253 
01254   x += 33;
01255   y += 17;
01256 
01257   DrawSprite(dts->ground.sprite, PAL_NONE, x, y);
01258 
01259   for (const DrawTileSeqStruct *dtss = dts->seq; dtss->image.sprite != 0; dtss++) {
01260     Point pt = RemapCoords(dtss->delta_x, dtss->delta_y, dtss->delta_z);
01261     SpriteID image = dtss->image.sprite;
01262 
01263     DrawSprite(image, HasBit(image, PALETTE_MODIFIER_COLOUR) ? palette : PAL_NONE, x + pt.x, y + pt.y);
01264   }
01265 }
01266 
01272 void UpdateNearestTownForRoadTiles(bool invalidate)
01273 {
01274   assert(!invalidate || _generating_world);
01275 
01276   for (TileIndex t = 0; t < MapSize(); t++) {
01277     if (IsTileType(t, MP_ROAD) && !IsRoadDepot(t) && !HasTownOwnedRoad(t)) {
01278       TownID tid = (TownID)INVALID_TOWN;
01279       if (!invalidate) {
01280         const Town *town = CalcClosestTownFromTile(t);
01281         if (town != NULL) tid = town->index;
01282       }
01283       SetTownIndex(t, tid);
01284     }
01285   }
01286 }
01287 
01288 static uint GetSlopeZ_Road(TileIndex tile, uint x, uint y)
01289 {
01290   uint z;
01291   Slope tileh = GetTileSlope(tile, &z);
01292 
01293   if (tileh == SLOPE_FLAT) return z;
01294   if (IsNormalRoad(tile)) {
01295     Foundation f = GetRoadFoundation(tileh, GetAllRoadBits(tile));
01296     z += ApplyFoundationToSlope(f, &tileh);
01297     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
01298   } else {
01299     return z + TILE_HEIGHT;
01300   }
01301 }
01302 
01303 static Foundation GetFoundation_Road(TileIndex tile, Slope tileh)
01304 {
01305   if (IsNormalRoad(tile)) {
01306     return GetRoadFoundation(tileh, GetAllRoadBits(tile));
01307   } else {
01308     return FlatteningFoundation(tileh);
01309   }
01310 }
01311 
01312 static const Roadside _town_road_types[][2] = {
01313   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01314   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01315   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01316   { ROADSIDE_TREES,         ROADSIDE_TREES },
01317   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01318 };
01319 
01320 static const Roadside _town_road_types_2[][2] = {
01321   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01322   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01323   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01324   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01325   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01326 };
01327 
01328 
01329 static void TileLoop_Road(TileIndex tile)
01330 {
01331   switch (_settings_game.game_creation.landscape) {
01332     case LT_ARCTIC:
01333       if (IsOnSnow(tile) != (GetTileZ(tile) > GetSnowLine())) {
01334         ToggleSnow(tile);
01335         MarkTileDirtyByTile(tile);
01336       }
01337       break;
01338 
01339     case LT_TROPIC:
01340       if (GetTropicZone(tile) == TROPICZONE_DESERT && !IsOnDesert(tile)) {
01341         ToggleDesert(tile);
01342         MarkTileDirtyByTile(tile);
01343       }
01344       break;
01345   }
01346 
01347   if (IsRoadDepot(tile)) return;
01348 
01349   const Town *t = ClosestTownFromTile(tile, UINT_MAX);
01350   if (!HasRoadWorks(tile)) {
01351     HouseZonesBits grp = HZB_TOWN_EDGE;
01352 
01353     if (t != NULL) {
01354       grp = GetTownRadiusGroup(t, tile);
01355 
01356       /* Show an animation to indicate road work */
01357       if (t->road_build_months != 0 &&
01358           (DistanceManhattan(t->xy, tile) < 8 || grp != HZB_TOWN_EDGE) &&
01359           IsNormalRoad(tile) && CountBits(GetAllRoadBits(tile)) > 1 ) {
01360         if (GetFoundationSlope(tile, NULL) == SLOPE_FLAT && EnsureNoVehicleOnGround(tile) && Chance16(1, 40)) {
01361           StartRoadWorks(tile);
01362 
01363           SndPlayTileFx(SND_21_JACKHAMMER, tile);
01364           CreateEffectVehicleAbove(
01365             TileX(tile) * TILE_SIZE + 7,
01366             TileY(tile) * TILE_SIZE + 7,
01367             0,
01368             EV_BULLDOZER);
01369           MarkTileDirtyByTile(tile);
01370           return;
01371         }
01372       }
01373     }
01374 
01375     {
01376       /* Adjust road ground type depending on 'grp' (grp is the distance to the center) */
01377       const Roadside *new_rs = (_settings_game.game_creation.landscape == LT_TOYLAND) ? _town_road_types_2[grp] : _town_road_types[grp];
01378       Roadside cur_rs = GetRoadside(tile);
01379 
01380       /* We have our desired type, do nothing */
01381       if (cur_rs == new_rs[0]) return;
01382 
01383       /* We have the pre-type of the desired type, switch to the desired type */
01384       if (cur_rs == new_rs[1]) {
01385         cur_rs = new_rs[0];
01386       /* We have barren land, install the pre-type */
01387       } else if (cur_rs == ROADSIDE_BARREN) {
01388         cur_rs = new_rs[1];
01389       /* We're totally off limits, remove any installation and make barren land */
01390       } else {
01391         cur_rs = ROADSIDE_BARREN;
01392       }
01393       SetRoadside(tile, cur_rs);
01394       MarkTileDirtyByTile(tile);
01395     }
01396   } else if (IncreaseRoadWorksCounter(tile)) {
01397     TerminateRoadWorks(tile);
01398 
01399     if (_settings_game.economy.mod_road_rebuild) {
01400       /* Generate a nicer town surface */
01401       const RoadBits old_rb = GetAnyRoadBits(tile, ROADTYPE_ROAD);
01402       const RoadBits new_rb = CleanUpRoadBits(tile, old_rb);
01403 
01404       if (old_rb != new_rb) {
01405         RemoveRoad(tile, DC_EXEC | DC_AUTO | DC_NO_WATER, (old_rb ^ new_rb), ROADTYPE_ROAD, true);
01406       }
01407     }
01408 
01409     MarkTileDirtyByTile(tile);
01410   }
01411 }
01412 
01413 static bool ClickTile_Road(TileIndex tile)
01414 {
01415   if (!IsRoadDepot(tile)) return false;
01416 
01417   ShowDepotWindow(tile, VEH_ROAD);
01418   return true;
01419 }
01420 
01421 /* Converts RoadBits to TrackBits */
01422 static const byte _road_trackbits[16] = {
01423   0x0, 0x0, 0x0, 0x10, 0x0, 0x2, 0x8, 0x1A, 0x0, 0x4, 0x1, 0x15, 0x20, 0x26, 0x29, 0x3F,
01424 };
01425 
01426 static TrackStatus GetTileTrackStatus_Road(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
01427 {
01428   TrackdirBits trackdirbits = TRACKDIR_BIT_NONE;
01429   TrackdirBits red_signals = TRACKDIR_BIT_NONE; // crossing barred
01430   switch (mode) {
01431     case TRANSPORT_RAIL:
01432       if (IsLevelCrossing(tile)) trackdirbits = TrackBitsToTrackdirBits(GetCrossingRailBits(tile));
01433       break;
01434 
01435     case TRANSPORT_ROAD:
01436       if ((GetRoadTypes(tile) & sub_mode) == 0) break;
01437       switch (GetRoadTileType(tile)) {
01438         case ROAD_TILE_NORMAL: {
01439           const uint drd_to_multiplier[DRD_END] = { 0x101, 0x100, 0x1, 0x0 };
01440           RoadType rt = (RoadType)FindFirstBit(sub_mode);
01441           RoadBits bits = GetRoadBits(tile, rt);
01442 
01443           /* no roadbit at this side of tile, return 0 */
01444           if (side != INVALID_DIAGDIR && (DiagDirToRoadBits(side) & bits) == 0) break;
01445 
01446           uint multiplier = drd_to_multiplier[rt == ROADTYPE_TRAM ? DRD_NONE : GetDisallowedRoadDirections(tile)];
01447           if (!HasRoadWorks(tile)) trackdirbits = (TrackdirBits)(_road_trackbits[bits] * multiplier);
01448           break;
01449         }
01450 
01451         case ROAD_TILE_CROSSING: {
01452           Axis axis = GetCrossingRoadAxis(tile);
01453 
01454           if (side != INVALID_DIAGDIR && axis != DiagDirToAxis(side)) break;
01455 
01456           trackdirbits = TrackBitsToTrackdirBits(AxisToTrackBits(axis));
01457           if (IsCrossingBarred(tile)) red_signals = trackdirbits;
01458           break;
01459         }
01460 
01461         default:
01462         case ROAD_TILE_DEPOT: {
01463           DiagDirection dir = GetRoadDepotDirection(tile);
01464 
01465           if (side != INVALID_DIAGDIR && side != dir) break;
01466 
01467           trackdirbits = TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir));
01468           break;
01469         }
01470       }
01471       break;
01472 
01473     default: break;
01474   }
01475   return CombineTrackStatus(trackdirbits, red_signals);
01476 }
01477 
01478 static const StringID _road_tile_strings[] = {
01479   STR_LAI_ROAD_DESCRIPTION_ROAD,
01480   STR_LAI_ROAD_DESCRIPTION_ROAD,
01481   STR_LAI_ROAD_DESCRIPTION_ROAD,
01482   STR_LAI_ROAD_DESCRIPTION_ROAD_WITH_STREETLIGHTS,
01483   STR_LAI_ROAD_DESCRIPTION_ROAD,
01484   STR_LAI_ROAD_DESCRIPTION_TREE_LINED_ROAD,
01485   STR_LAI_ROAD_DESCRIPTION_ROAD,
01486   STR_LAI_ROAD_DESCRIPTION_ROAD,
01487 };
01488 
01489 static void GetTileDesc_Road(TileIndex tile, TileDesc *td)
01490 {
01491   Owner rail_owner = INVALID_OWNER;
01492   Owner road_owner = INVALID_OWNER;
01493   Owner tram_owner = INVALID_OWNER;
01494 
01495   switch (GetRoadTileType(tile)) {
01496     case ROAD_TILE_CROSSING: {
01497       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_RAIL_LEVEL_CROSSING;
01498       RoadTypes rts = GetRoadTypes(tile);
01499       rail_owner = GetTileOwner(tile);
01500       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01501       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01502       break;
01503     }
01504 
01505     case ROAD_TILE_DEPOT:
01506       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_VEHICLE_DEPOT;
01507       road_owner = GetTileOwner(tile); // Tile has only one owner, roadtype does not matter
01508       break;
01509 
01510     default: {
01511       RoadTypes rts = GetRoadTypes(tile);
01512       td->str = (HasBit(rts, ROADTYPE_ROAD) ? _road_tile_strings[GetRoadside(tile)] : STR_LAI_ROAD_DESCRIPTION_TRAMWAY);
01513       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01514       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01515       break;
01516     }
01517   }
01518 
01519   /* Now we have to discover, if the tile has only one owner or many:
01520    *   - Find a first_owner of the tile. (Currently road or tram must be present, but this will break when the third type becomes available)
01521    *   - Compare the found owner with the other owners, and test if they differ.
01522    * Note: If road exists it will be the first_owner.
01523    */
01524   Owner first_owner = (road_owner == INVALID_OWNER ? tram_owner : road_owner);
01525   bool mixed_owners = (tram_owner != INVALID_OWNER && tram_owner != first_owner) || (rail_owner != INVALID_OWNER && rail_owner != first_owner);
01526 
01527   if (mixed_owners) {
01528     /* Multiple owners */
01529     td->owner_type[0] = (rail_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_RAIL_OWNER);
01530     td->owner[0] = rail_owner;
01531     td->owner_type[1] = (road_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_ROAD_OWNER);
01532     td->owner[1] = road_owner;
01533     td->owner_type[2] = (tram_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_TRAM_OWNER);
01534     td->owner[2] = tram_owner;
01535   } else {
01536     /* One to rule them all */
01537     td->owner[0] = first_owner;
01538   }
01539 }
01540 
01545 static const byte _roadveh_enter_depot_dir[4] = {
01546   TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE
01547 };
01548 
01549 static VehicleEnterTileStatus VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
01550 {
01551   switch (GetRoadTileType(tile)) {
01552     case ROAD_TILE_DEPOT: {
01553       if (v->type != VEH_ROAD) break;
01554 
01555       RoadVehicle *rv = RoadVehicle::From(v);
01556       if (rv->frame == RVC_DEPOT_STOP_FRAME &&
01557           _roadveh_enter_depot_dir[GetRoadDepotDirection(tile)] == rv->state) {
01558         rv->state = RVSB_IN_DEPOT;
01559         rv->vehstatus |= VS_HIDDEN;
01560         rv->direction = ReverseDir(rv->direction);
01561         if (rv->Next() == NULL) VehicleEnterDepot(rv->First());
01562         rv->tile = tile;
01563 
01564         InvalidateWindowData(WC_VEHICLE_DEPOT, rv->tile);
01565         return VETSB_ENTERED_WORMHOLE;
01566       }
01567     } break;
01568 
01569     default: break;
01570   }
01571   return VETSB_CONTINUE;
01572 }
01573 
01574 
01575 static void ChangeTileOwner_Road(TileIndex tile, Owner old_owner, Owner new_owner)
01576 {
01577   if (IsRoadDepot(tile)) {
01578     if (GetTileOwner(tile) == old_owner) {
01579       if (new_owner == INVALID_OWNER) {
01580         DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
01581       } else {
01582         SetTileOwner(tile, new_owner);
01583       }
01584     }
01585     return;
01586   }
01587 
01588   for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
01589     /* Update all roadtypes, no matter if they are present */
01590     if (GetRoadOwner(tile, rt) == old_owner) {
01591       SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
01592     }
01593   }
01594 
01595   if (IsLevelCrossing(tile)) {
01596     if (GetTileOwner(tile) == old_owner) {
01597       if (new_owner == INVALID_OWNER) {
01598         DoCommand(tile, 0, GetCrossingRailTrack(tile), DC_EXEC | DC_BANKRUPT, CMD_REMOVE_SINGLE_RAIL);
01599       } else {
01600         SetTileOwner(tile, new_owner);
01601       }
01602     }
01603   }
01604 }
01605 
01606 static CommandCost TerraformTile_Road(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
01607 {
01608   if (_settings_game.construction.build_on_slopes && AutoslopeEnabled()) {
01609     switch (GetRoadTileType(tile)) {
01610       case ROAD_TILE_CROSSING:
01611         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]);
01612         break;
01613 
01614       case ROAD_TILE_DEPOT:
01615         if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRoadDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01616         break;
01617 
01618       case ROAD_TILE_NORMAL: {
01619         RoadBits bits = GetAllRoadBits(tile);
01620         RoadBits bits_copy = bits;
01621         /* Check if the slope-road_bits combination is valid at all, i.e. it is safe to call GetRoadFoundation(). */
01622         if (!CmdFailed(CheckRoadSlope(tileh_new, &bits_copy, ROAD_NONE, ROAD_NONE))) {
01623           /* CheckRoadSlope() sometimes changes the road_bits, if it does not agree with them. */
01624           if (bits == bits_copy) {
01625             uint z_old;
01626             Slope tileh_old = GetTileSlope(tile, &z_old);
01627 
01628             /* Get the slope on top of the foundation */
01629             z_old += ApplyFoundationToSlope(GetRoadFoundation(tileh_old, bits), &tileh_old);
01630             z_new += ApplyFoundationToSlope(GetRoadFoundation(tileh_new, bits), &tileh_new);
01631 
01632             /* The surface slope must not be changed */
01633             if ((z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01634           }
01635         }
01636         break;
01637       }
01638 
01639       default: NOT_REACHED();
01640     }
01641   }
01642 
01643   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
01644 }
01645 
01647 extern const TileTypeProcs _tile_type_road_procs = {
01648   DrawTile_Road,           // draw_tile_proc
01649   GetSlopeZ_Road,          // get_slope_z_proc
01650   ClearTile_Road,          // clear_tile_proc
01651   NULL,                    // add_accepted_cargo_proc
01652   GetTileDesc_Road,        // get_tile_desc_proc
01653   GetTileTrackStatus_Road, // get_tile_track_status_proc
01654   ClickTile_Road,          // click_tile_proc
01655   NULL,                    // animate_tile_proc
01656   TileLoop_Road,           // tile_loop_clear
01657   ChangeTileOwner_Road,    // change_tile_owner_clear
01658   NULL,                    // add_produced_cargo_proc
01659   VehicleEnter_Road,       // vehicle_enter_tile_proc
01660   GetFoundation_Road,      // get_foundation_proc
01661   TerraformTile_Road,      // terraform_tile_proc
01662 };

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