road_cmd.cpp

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00001 /* $Id: road_cmd.cpp 22702 2011-07-30 17:48:23Z 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 "viewport_func.h"
00016 #include "command_func.h"
00017 #include "pathfinder/yapf/yapf_cache.h"
00018 #include "depot_base.h"
00019 #include "newgrf.h"
00020 #include "autoslope.h"
00021 #include "tunnelbridge_map.h"
00022 #include "window_func.h"
00023 #include "strings_func.h"
00024 #include "vehicle_func.h"
00025 #include "sound_func.h"
00026 #include "tunnelbridge.h"
00027 #include "cheat_type.h"
00028 #include "effectvehicle_func.h"
00029 #include "effectvehicle_base.h"
00030 #include "elrail_func.h"
00031 #include "roadveh.h"
00032 #include "town.h"
00033 #include "company_base.h"
00034 #include "core/random_func.hpp"
00035 #include "newgrf_railtype.h"
00036 #include "date_func.h"
00037 #include "genworld.h"
00038 
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 
00054 static const RoadBits _invalid_tileh_slopes_road[2][15] = {
00055   /* The inverse of the mixable RoadBits on a leveled slope */
00056   {
00057     ROAD_NONE,         // SLOPE_FLAT
00058     ROAD_NE | ROAD_SE, // SLOPE_W
00059     ROAD_NE | ROAD_NW, // SLOPE_S
00060 
00061     ROAD_NE,           // SLOPE_SW
00062     ROAD_NW | ROAD_SW, // SLOPE_E
00063     ROAD_NONE,         // SLOPE_EW
00064 
00065     ROAD_NW,           // SLOPE_SE
00066     ROAD_NONE,         // SLOPE_WSE
00067     ROAD_SE | ROAD_SW, // SLOPE_N
00068 
00069     ROAD_SE,           // SLOPE_NW
00070     ROAD_NONE,         // SLOPE_NS
00071     ROAD_NONE,         // SLOPE_ENW
00072 
00073     ROAD_SW,           // SLOPE_NE
00074     ROAD_NONE,         // SLOPE_SEN
00075     ROAD_NONE          // SLOPE_NWS
00076   },
00077   /* The inverse of the allowed straight roads on a slope
00078    * (with and without a foundation). */
00079   {
00080     ROAD_NONE, // SLOPE_FLAT
00081     ROAD_NONE, // SLOPE_W    Foundation
00082     ROAD_NONE, // SLOPE_S    Foundation
00083 
00084     ROAD_Y,    // SLOPE_SW
00085     ROAD_NONE, // SLOPE_E    Foundation
00086     ROAD_ALL,  // SLOPE_EW
00087 
00088     ROAD_X,    // SLOPE_SE
00089     ROAD_ALL,  // SLOPE_WSE
00090     ROAD_NONE, // SLOPE_N    Foundation
00091 
00092     ROAD_X,    // SLOPE_NW
00093     ROAD_ALL,  // SLOPE_NS
00094     ROAD_ALL,  // SLOPE_ENW
00095 
00096     ROAD_Y,    // SLOPE_NE
00097     ROAD_ALL,  // SLOPE_SEN
00098     ROAD_ALL   // SLOPE_NW
00099   }
00100 };
00101 
00102 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits);
00103 
00114 CommandCost CheckAllowRemoveRoad(TileIndex tile, RoadBits remove, Owner owner, RoadType rt, DoCommandFlag flags, bool town_check)
00115 {
00116   if (_game_mode == GM_EDITOR || remove == ROAD_NONE) return CommandCost();
00117 
00118   /* Water can always flood and towns can always remove "normal" road pieces.
00119    * Towns are not be allowed to remove non "normal" road pieces, like tram
00120    * tracks as that would result in trams that cannot turn. */
00121   if (_current_company == OWNER_WATER ||
00122       (rt == ROADTYPE_ROAD && !Company::IsValidID(_current_company))) return CommandCost();
00123 
00124   /* Only do the special processing if the road is owned
00125    * by a town */
00126   if (owner != OWNER_TOWN) {
00127     if (owner == OWNER_NONE) return CommandCost();
00128     CommandCost ret = CheckOwnership(owner);
00129     return ret;
00130   }
00131 
00132   if (!town_check) return CommandCost();
00133 
00134   if (_cheats.magic_bulldozer.value) return CommandCost();
00135 
00136   Town *t = ClosestTownFromTile(tile, UINT_MAX);
00137   if (t == NULL) return CommandCost();
00138 
00139   /* check if you're allowed to remove the street owned by a town
00140    * removal allowance depends on difficulty setting */
00141   CommandCost ret = CheckforTownRating(flags, t, ROAD_REMOVE);
00142   if (ret.Failed()) return ret;
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       return_cmd_error(STR_ERROR_LOCAL_AUTHORITY_REFUSES_TO_ALLOW_THIS);
00160     }
00161     rating_decrease = RATING_ROAD_DOWN_STEP_INNER;
00162   }
00163   ChangeTownRating(t, rating_decrease, RATING_ROAD_MINIMUM, flags);
00164 
00165   return CommandCost();
00166 }
00167 
00168 
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(rt == ROADTYPE_TRAM ? STR_ERROR_THERE_IS_NO_TRAMWAY : STR_ERROR_THERE_IS_NO_ROAD);
00183 
00184   switch (GetTileType(tile)) {
00185     case MP_ROAD: {
00186       CommandCost ret = EnsureNoVehicleOnGround(tile);
00187       if (ret.Failed()) return ret;
00188       break;
00189     }
00190 
00191     case MP_STATION: {
00192       if (!IsDriveThroughStopTile(tile)) return CMD_ERROR;
00193 
00194       CommandCost ret = EnsureNoVehicleOnGround(tile);
00195       if (ret.Failed()) return ret;
00196       break;
00197     }
00198 
00199     case MP_TUNNELBRIDGE: {
00200       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) return CMD_ERROR;
00201       CommandCost ret = TunnelBridgeIsFree(tile, GetOtherTunnelBridgeEnd(tile));
00202       if (ret.Failed()) return ret;
00203       break;
00204     }
00205 
00206     default:
00207       return CMD_ERROR;
00208   }
00209 
00210   CommandCost ret = CheckAllowRemoveRoad(tile, pieces, GetRoadOwner(tile, rt), rt, flags, town_check);
00211   if (ret.Failed()) return ret;
00212 
00213   if (!IsTileType(tile, MP_ROAD)) {
00214     /* If it's the last roadtype, just clear the whole tile */
00215     if (rts == RoadTypeToRoadTypes(rt)) return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00216 
00217     CommandCost cost(EXPENSES_CONSTRUCTION);
00218     if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00219       TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
00220       /* Pay for *every* tile of the bridge or tunnel */
00221       cost.AddCost((GetTunnelBridgeLength(other_end, tile) + 2) * _price[PR_CLEAR_ROAD]);
00222       if (flags & DC_EXEC) {
00223         SetRoadTypes(other_end, GetRoadTypes(other_end) & ~RoadTypeToRoadTypes(rt));
00224         SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
00225 
00226         /* If the owner of the bridge sells all its road, also move the ownership
00227          * to the owner of the other roadtype. */
00228         RoadType other_rt = (rt == ROADTYPE_ROAD) ? ROADTYPE_TRAM : ROADTYPE_ROAD;
00229         Owner other_owner = GetRoadOwner(tile, other_rt);
00230         if (other_owner != GetTileOwner(tile)) {
00231           SetTileOwner(tile, other_owner);
00232           SetTileOwner(other_end, other_owner);
00233         }
00234 
00235         /* Mark tiles diry that have been repaved */
00236         MarkTileDirtyByTile(tile);
00237         MarkTileDirtyByTile(other_end);
00238         if (IsBridge(tile)) {
00239           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
00240 
00241           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
00242         }
00243       }
00244     } else {
00245       assert(IsDriveThroughStopTile(tile));
00246       cost.AddCost(_price[PR_CLEAR_ROAD] * 2);
00247       if (flags & DC_EXEC) {
00248         SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
00249         MarkTileDirtyByTile(tile);
00250       }
00251     }
00252     return cost;
00253   }
00254 
00255   switch (GetRoadTileType(tile)) {
00256     case ROAD_TILE_NORMAL: {
00257       const Slope tileh = GetTileSlope(tile, NULL);
00258       RoadBits present = GetRoadBits(tile, rt);
00259       const RoadBits other = GetOtherRoadBits(tile, rt);
00260       const Foundation f = GetRoadFoundation(tileh, present);
00261 
00262       if (HasRoadWorks(tile) && _current_company != OWNER_WATER) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00263 
00264       /* Autocomplete to a straight road
00265        * @li on steep slopes
00266        * @li if the bits of the other roadtypes result in another foundation
00267        * @li if build on slopes is disabled */
00268       if (IsSteepSlope(tileh) || (IsStraightRoad(other) &&
00269           (other & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) != ROAD_NONE) ||
00270           (tileh != SLOPE_FLAT && !_settings_game.construction.build_on_slopes)) {
00271         pieces |= MirrorRoadBits(pieces);
00272       }
00273 
00274       /* limit the bits to delete to the existing bits. */
00275       pieces &= present;
00276       if (pieces == ROAD_NONE) return_cmd_error(rt == ROADTYPE_TRAM ? STR_ERROR_THERE_IS_NO_TRAMWAY : STR_ERROR_THERE_IS_NO_ROAD);
00277 
00278       /* Now set present what it will be after the remove */
00279       present ^= pieces;
00280 
00281       /* Check for invalid RoadBit combinations on slopes */
00282       if (tileh != SLOPE_FLAT && present != ROAD_NONE &&
00283           (present & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) == present) {
00284         return CMD_ERROR;
00285       }
00286 
00287       if (flags & DC_EXEC) {
00288         if (HasRoadWorks(tile)) {
00289           /* flooding tile with road works, don't forget to remove the effect vehicle too */
00290           assert(_current_company == OWNER_WATER);
00291           EffectVehicle *v;
00292           FOR_ALL_EFFECTVEHICLES(v) {
00293             if (TileVirtXY(v->x_pos, v->y_pos) == tile) {
00294               delete v;
00295             }
00296           }
00297         }
00298         if (present == ROAD_NONE) {
00299           RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));
00300           if (rts == ROADTYPES_NONE) {
00301             /* Includes MarkTileDirtyByTile() */
00302             DoClearSquare(tile);
00303           } else {
00304             if (rt == ROADTYPE_ROAD && IsRoadOwner(tile, ROADTYPE_ROAD, OWNER_TOWN)) {
00305               /* Update nearest-town index */
00306               const Town *town = CalcClosestTownFromTile(tile);
00307               SetTownIndex(tile, town == NULL ? (TownID)INVALID_TOWN : town->index);
00308             }
00309             SetRoadBits(tile, ROAD_NONE, rt);
00310             SetRoadTypes(tile, rts);
00311             MarkTileDirtyByTile(tile);
00312           }
00313         } else {
00314           /* When bits are removed, you *always* end up with something that
00315            * is not a complete straight road tile. However, trams do not have
00316            * onewayness, so they cannot remove it either. */
00317           if (rt != ROADTYPE_TRAM) SetDisallowedRoadDirections(tile, DRD_NONE);
00318           SetRoadBits(tile, present, rt);
00319           MarkTileDirtyByTile(tile);
00320         }
00321       }
00322 
00323       CommandCost cost(EXPENSES_CONSTRUCTION, CountBits(pieces) * _price[PR_CLEAR_ROAD]);
00324       /* If we build a foundation we have to pay for it. */
00325       if (f == FOUNDATION_NONE && GetRoadFoundation(tileh, present) != FOUNDATION_NONE) cost.AddCost(_price[PR_BUILD_FOUNDATION]);
00326 
00327       return cost;
00328     }
00329 
00330     case ROAD_TILE_CROSSING: {
00331       if (pieces & ComplementRoadBits(GetCrossingRoadBits(tile))) {
00332         return CMD_ERROR;
00333       }
00334 
00335       /* Don't allow road to be removed from the crossing when there is tram;
00336        * we can't draw the crossing without roadbits ;) */
00337       if (rt == ROADTYPE_ROAD && HasTileRoadType(tile, ROADTYPE_TRAM) && (flags & DC_EXEC || crossing_check)) return CMD_ERROR;
00338 
00339       if (flags & DC_EXEC) {
00340         Track railtrack = GetCrossingRailTrack(tile);
00341         RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));
00342         if (rts == ROADTYPES_NONE) {
00343           TrackBits tracks = GetCrossingRailBits(tile);
00344           bool reserved = HasCrossingReservation(tile);
00345           MakeRailNormal(tile, GetTileOwner(tile), tracks, GetRailType(tile));
00346           if (reserved) SetTrackReservation(tile, tracks);
00347         } else {
00348           SetRoadTypes(tile, rts);
00349           /* If we ever get HWAY and it is possible without road then we will need to promote ownership and invalidate town index here, too */
00350         }
00351         MarkTileDirtyByTile(tile);
00352         YapfNotifyTrackLayoutChange(tile, railtrack);
00353       }
00354       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_ROAD] * 2);
00355     }
00356 
00357     default:
00358     case ROAD_TILE_DEPOT:
00359       return CMD_ERROR;
00360   }
00361 }
00362 
00363 
00375 static CommandCost CheckRoadSlope(Slope tileh, RoadBits *pieces, RoadBits existing, RoadBits other)
00376 {
00377   /* Remove already build pieces */
00378   CLRBITS(*pieces, existing);
00379 
00380   /* If we can't build anything stop here */
00381   if (*pieces == ROAD_NONE) return CMD_ERROR;
00382 
00383   /* All RoadBit combos are valid on flat land */
00384   if (tileh == SLOPE_FLAT) return CommandCost();
00385 
00386   /* Proceed steep Slopes first to reduce lookup table size */
00387   if (IsSteepSlope(tileh)) {
00388     /* Force straight roads. */
00389     *pieces |= MirrorRoadBits(*pieces);
00390 
00391     /* Use existing as all existing since only straight
00392      * roads are allowed here. */
00393     existing |= other;
00394 
00395     if ((existing == ROAD_NONE || existing == *pieces) && IsStraightRoad(*pieces)) {
00396       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00397     }
00398     return CMD_ERROR;
00399   }
00400 
00401   /* Save the merge of all bits of the current type */
00402   RoadBits type_bits = existing | *pieces;
00403 
00404   /* Roads on slopes */
00405   if (_settings_game.construction.build_on_slopes && (_invalid_tileh_slopes_road[0][tileh] & (other | type_bits)) == ROAD_NONE) {
00406 
00407     /* If we add leveling we've got to pay for it */
00408     if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00409 
00410     return CommandCost();
00411   }
00412 
00413   /* Autocomplete uphill roads */
00414   *pieces |= MirrorRoadBits(*pieces);
00415   type_bits = existing | *pieces;
00416 
00417   /* Uphill roads */
00418   if (IsStraightRoad(type_bits) && (other == type_bits || other == ROAD_NONE) &&
00419       (_invalid_tileh_slopes_road[1][tileh] & (other | type_bits)) == ROAD_NONE) {
00420 
00421     /* Slopes with foundation ? */
00422     if (IsSlopeWithOneCornerRaised(tileh)) {
00423 
00424       /* Prevent build on slopes if it isn't allowed */
00425       if (_settings_game.construction.build_on_slopes) {
00426 
00427         /* If we add foundation we've got to pay for it */
00428         if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00429 
00430         return CommandCost();
00431       }
00432     } else {
00433       if (HasExactlyOneBit(existing) && GetRoadFoundation(tileh, existing) == FOUNDATION_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00434       return CommandCost();
00435     }
00436   }
00437   return CMD_ERROR;
00438 }
00439 
00451 CommandCost CmdBuildRoad(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00452 {
00453   CommandCost cost(EXPENSES_CONSTRUCTION);
00454 
00455   RoadBits existing = ROAD_NONE;
00456   RoadBits other_bits = ROAD_NONE;
00457 
00458   /* Road pieces are max 4 bitset values (NE, NW, SE, SW) and town can only be non-zero
00459    * if a non-company is building the road */
00460   if ((Company::IsValidID(_current_company) && p2 != 0) || (_current_company == OWNER_TOWN && !Town::IsValidID(p2))) return CMD_ERROR;
00461   if (_current_company != OWNER_TOWN) {
00462     const Town *town = CalcClosestTownFromTile(tile);
00463     p2 = (town != NULL) ? town->index : (TownID)INVALID_TOWN;
00464   }
00465 
00466   RoadBits pieces = Extract<RoadBits, 0, 4>(p1);
00467 
00468   /* do not allow building 'zero' road bits, code wouldn't handle it */
00469   if (pieces == ROAD_NONE) return CMD_ERROR;
00470 
00471   RoadType rt = Extract<RoadType, 4, 2>(p1);
00472   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00473 
00474   DisallowedRoadDirections toggle_drd = Extract<DisallowedRoadDirections, 6, 2>(p1);
00475 
00476   Slope tileh = GetTileSlope(tile, NULL);
00477 
00478   bool need_to_clear = false;
00479   switch (GetTileType(tile)) {
00480     case MP_ROAD:
00481       switch (GetRoadTileType(tile)) {
00482         case ROAD_TILE_NORMAL: {
00483           if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00484 
00485           other_bits = GetOtherRoadBits(tile, rt);
00486           if (!HasTileRoadType(tile, rt)) break;
00487 
00488           existing = GetRoadBits(tile, rt);
00489           bool crossing = !IsStraightRoad(existing | pieces);
00490           if (rt != ROADTYPE_TRAM && (GetDisallowedRoadDirections(tile) != DRD_NONE || toggle_drd != DRD_NONE) && crossing) {
00491             /* Junctions cannot be one-way */
00492             return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
00493           }
00494           if ((existing & pieces) == pieces) {
00495             /* We only want to set the (dis)allowed road directions */
00496             if (toggle_drd != DRD_NONE && rt != ROADTYPE_TRAM) {
00497               if (crossing) return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
00498 
00499               Owner owner = GetRoadOwner(tile, ROADTYPE_ROAD);
00500               if (owner != OWNER_NONE) {
00501                 CommandCost ret = CheckOwnership(owner, tile);
00502                 if (ret.Failed()) return ret;
00503               }
00504 
00505               DisallowedRoadDirections dis_existing = GetDisallowedRoadDirections(tile);
00506               DisallowedRoadDirections dis_new      = dis_existing ^ toggle_drd;
00507 
00508               /* We allow removing disallowed directions to break up
00509                * deadlocks, but adding them can break articulated
00510                * vehicles. As such, only when less is disallowed,
00511                * i.e. bits are removed, we skip the vehicle check. */
00512               if (CountBits(dis_existing) <= CountBits(dis_new)) {
00513                 CommandCost ret = EnsureNoVehicleOnGround(tile);
00514                 if (ret.Failed()) return ret;
00515               }
00516 
00517               /* Ignore half built tiles */
00518               if ((flags & DC_EXEC) && rt != ROADTYPE_TRAM && IsStraightRoad(existing)) {
00519                 SetDisallowedRoadDirections(tile, dis_new);
00520                 MarkTileDirtyByTile(tile);
00521               }
00522               return CommandCost();
00523             }
00524             return_cmd_error(STR_ERROR_ALREADY_BUILT);
00525           }
00526           break;
00527         }
00528 
00529         case ROAD_TILE_CROSSING:
00530           other_bits = GetCrossingRoadBits(tile);
00531           if (pieces & ComplementRoadBits(other_bits)) goto do_clear;
00532           pieces = other_bits; // we need to pay for both roadbits
00533 
00534           if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00535           break;
00536 
00537         case ROAD_TILE_DEPOT:
00538           if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00539           goto do_clear;
00540 
00541         default: NOT_REACHED();
00542       }
00543       break;
00544 
00545     case MP_RAILWAY: {
00546       if (IsSteepSlope(tileh)) {
00547         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00548       }
00549 
00550       /* Level crossings may only be built on these slopes */
00551       if (!HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh)) {
00552         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00553       }
00554 
00555       if (GetRailTileType(tile) != RAIL_TILE_NORMAL) goto do_clear;
00556 
00557       if (RailNoLevelCrossings(GetRailType(tile))) {
00558         return_cmd_error(STR_ERROR_CROSSING_DISALLOWED);
00559       }
00560 
00561       Axis roaddir;
00562       switch (GetTrackBits(tile)) {
00563         case TRACK_BIT_X:
00564           if (pieces & ROAD_X) goto do_clear;
00565           roaddir = AXIS_Y;
00566           break;
00567 
00568         case TRACK_BIT_Y:
00569           if (pieces & ROAD_Y) goto do_clear;
00570           roaddir = AXIS_X;
00571           break;
00572 
00573         default: goto do_clear;
00574       }
00575 
00576       CommandCost ret = EnsureNoVehicleOnGround(tile);
00577       if (ret.Failed()) return ret;
00578 
00579       if (flags & DC_EXEC) {
00580         Track railtrack = AxisToTrack(OtherAxis(roaddir));
00581         YapfNotifyTrackLayoutChange(tile, railtrack);
00582         /* Always add road to the roadtypes (can't draw without it) */
00583         bool reserved = HasBit(GetRailReservationTrackBits(tile), railtrack);
00584         MakeRoadCrossing(tile, _current_company, _current_company, GetTileOwner(tile), roaddir, GetRailType(tile), RoadTypeToRoadTypes(rt) | ROADTYPES_ROAD, p2);
00585         SetCrossingReservation(tile, reserved);
00586         UpdateLevelCrossing(tile, false);
00587         MarkTileDirtyByTile(tile);
00588       }
00589       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_ROAD] * (rt == ROADTYPE_ROAD ? 2 : 4));
00590     }
00591 
00592     case MP_STATION: {
00593       if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00594       if (!IsDriveThroughStopTile(tile)) goto do_clear;
00595 
00596       RoadBits curbits = AxisToRoadBits(DiagDirToAxis(GetRoadStopDir(tile)));
00597       if (pieces & ~curbits) goto do_clear;
00598       pieces = curbits; // we need to pay for both roadbits
00599 
00600       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00601       break;
00602     }
00603 
00604     case MP_TUNNELBRIDGE: {
00605       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) goto do_clear;
00606       if (MirrorRoadBits(DiagDirToRoadBits(GetTunnelBridgeDirection(tile))) != pieces) goto do_clear;
00607       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00608       /* Don't allow adding roadtype to the bridge/tunnel when vehicles are already driving on it */
00609       CommandCost ret = TunnelBridgeIsFree(tile, GetOtherTunnelBridgeEnd(tile));
00610       if (ret.Failed()) return ret;
00611       break;
00612     }
00613 
00614     default: {
00615 do_clear:;
00616       need_to_clear = true;
00617       break;
00618     }
00619   }
00620 
00621   if (need_to_clear) {
00622     CommandCost ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00623     if (ret.Failed()) return ret;
00624     cost.AddCost(ret);
00625   }
00626 
00627   if (other_bits != pieces) {
00628     /* Check the foundation/slopes when adding road/tram bits */
00629     CommandCost ret = CheckRoadSlope(tileh, &pieces, existing, other_bits);
00630     /* Return an error if we need to build a foundation (ret != 0) but the
00631      * current setting is turned off */
00632     if (ret.Failed() || (ret.GetCost() != 0 && !_settings_game.construction.build_on_slopes)) {
00633       return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00634     }
00635     cost.AddCost(ret);
00636   }
00637 
00638   if (!need_to_clear) {
00639     if (IsTileType(tile, MP_ROAD)) {
00640       /* Don't put the pieces that already exist */
00641       pieces &= ComplementRoadBits(existing);
00642 
00643       /* Check if new road bits will have the same foundation as other existing road types */
00644       if (IsNormalRoad(tile)) {
00645         Slope slope = GetTileSlope(tile, NULL);
00646         Foundation found_new = GetRoadFoundation(slope, pieces | existing);
00647 
00648         /* Test if all other roadtypes can be built at that foundation */
00649         for (RoadType rtest = ROADTYPE_ROAD; rtest < ROADTYPE_END; rtest++) {
00650           if (rtest != rt) { // check only other road types
00651             RoadBits bits = GetRoadBits(tile, rtest);
00652             /* do not check if there are not road bits of given type */
00653             if (bits != ROAD_NONE && GetRoadFoundation(slope, bits) != found_new) {
00654               return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00655             }
00656           }
00657         }
00658       }
00659     }
00660 
00661     CommandCost ret = EnsureNoVehicleOnGround(tile);
00662     if (ret.Failed()) return ret;
00663 
00664   }
00665 
00666   uint num_pieces = (!need_to_clear && IsTileType(tile, MP_TUNNELBRIDGE)) ?
00667       /* There are 2 pieces on *every* tile of the bridge or tunnel */
00668       2 * (GetTunnelBridgeLength(GetOtherTunnelBridgeEnd(tile), tile) + 2) :
00669       /* Count pieces */
00670       CountBits(pieces);
00671 
00672   cost.AddCost(num_pieces * _price[PR_BUILD_ROAD]);
00673 
00674   if (flags & DC_EXEC) {
00675     switch (GetTileType(tile)) {
00676       case MP_ROAD: {
00677         RoadTileType rtt = GetRoadTileType(tile);
00678         if (existing == ROAD_NONE || rtt == ROAD_TILE_CROSSING) {
00679           SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00680           SetRoadOwner(tile, rt, _current_company);
00681           if (rt == ROADTYPE_ROAD) SetTownIndex(tile, p2);
00682         }
00683         if (rtt != ROAD_TILE_CROSSING) SetRoadBits(tile, existing | pieces, rt);
00684         break;
00685       }
00686 
00687       case MP_TUNNELBRIDGE: {
00688         TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
00689 
00690         SetRoadTypes(other_end, GetRoadTypes(other_end) | RoadTypeToRoadTypes(rt));
00691         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00692         SetRoadOwner(other_end, rt, _current_company);
00693         SetRoadOwner(tile, rt, _current_company);
00694 
00695         /* Mark tiles diry that have been repaved */
00696         MarkTileDirtyByTile(other_end);
00697         MarkTileDirtyByTile(tile);
00698         if (IsBridge(tile)) {
00699           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
00700 
00701           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
00702         }
00703         break;
00704       }
00705 
00706       case MP_STATION:
00707         assert(IsDriveThroughStopTile(tile));
00708         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00709         SetRoadOwner(tile, rt, _current_company);
00710         break;
00711 
00712       default:
00713         MakeRoadNormal(tile, pieces, RoadTypeToRoadTypes(rt), p2, _current_company, _current_company);
00714         break;
00715     }
00716 
00717     if (rt != ROADTYPE_TRAM && IsNormalRoadTile(tile)) {
00718       existing |= pieces;
00719       SetDisallowedRoadDirections(tile, IsStraightRoad(existing) ?
00720           GetDisallowedRoadDirections(tile) ^ toggle_drd : DRD_NONE);
00721     }
00722 
00723     MarkTileDirtyByTile(tile);
00724   }
00725   return cost;
00726 }
00727 
00743 CommandCost CmdBuildLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00744 {
00745   DisallowedRoadDirections drd = DRD_NORTHBOUND;
00746 
00747   if (p1 >= MapSize()) return CMD_ERROR;
00748 
00749   TileIndex end_tile = p1;
00750   RoadType rt = Extract<RoadType, 3, 2>(p2);
00751   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00752 
00753   Axis axis = Extract<Axis, 2, 1>(p2);
00754   /* Only drag in X or Y direction dictated by the direction variable */
00755   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00756   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00757 
00758   DiagDirection dir = AxisToDiagDir(axis);
00759 
00760   /* Swap direction, also the half-tile drag var (bit 0 and 1) */
00761   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00762     dir = ReverseDiagDir(dir);
00763     p2 ^= 3;
00764     drd = DRD_SOUTHBOUND;
00765   }
00766 
00767   /* On the X-axis, we have to swap the initial bits, so they
00768    * will be interpreted correctly in the GTTS. Futhermore
00769    * when you just 'click' on one tile to build them. */
00770   if ((axis == AXIS_Y) == (start_tile == end_tile && HasBit(p2, 0) == HasBit(p2, 1))) drd ^= DRD_BOTH;
00771   /* No disallowed direction bits have to be toggled */
00772   if (!HasBit(p2, 5)) drd = DRD_NONE;
00773 
00774   CommandCost cost(EXPENSES_CONSTRUCTION);
00775   CommandCost last_error = CMD_ERROR;
00776   TileIndex tile = start_tile;
00777   bool had_bridge = false;
00778   bool had_tunnel = false;
00779   bool had_success = false;
00780   /* Start tile is the first tile clicked by the user. */
00781   for (;;) {
00782     RoadBits bits = AxisToRoadBits(axis);
00783 
00784     /* Road parts only have to be built at the start tile or at the end tile. */
00785     if (tile == end_tile && !HasBit(p2, 1)) bits &= DiagDirToRoadBits(ReverseDiagDir(dir));
00786     if (tile == start_tile && HasBit(p2, 0)) bits &= DiagDirToRoadBits(dir);
00787 
00788     CommandCost ret = DoCommand(tile, drd << 6 | rt << 4 | bits, 0, flags, CMD_BUILD_ROAD);
00789     if (ret.Failed()) {
00790       last_error = ret;
00791       if (last_error.GetErrorMessage() != STR_ERROR_ALREADY_BUILT) {
00792         if (HasBit(p2, 6)) return last_error;
00793         break;
00794       }
00795     } else {
00796       had_success = true;
00797       /* Only pay for the upgrade on one side of the bridges and tunnels */
00798       if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00799         if (IsBridge(tile)) {
00800           if (!had_bridge || GetTunnelBridgeDirection(tile) == dir) {
00801             cost.AddCost(ret);
00802           }
00803           had_bridge = true;
00804         } else { // IsTunnel(tile)
00805           if (!had_tunnel || GetTunnelBridgeDirection(tile) == dir) {
00806             cost.AddCost(ret);
00807           }
00808           had_tunnel = true;
00809         }
00810       } else {
00811         cost.AddCost(ret);
00812       }
00813     }
00814 
00815     if (tile == end_tile) break;
00816 
00817     tile += TileOffsByDiagDir(dir);
00818   }
00819 
00820   return had_success ? cost : last_error;
00821 }
00822 
00836 CommandCost CmdRemoveLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00837 {
00838   CommandCost cost(EXPENSES_CONSTRUCTION);
00839 
00840   if (p1 >= MapSize()) return CMD_ERROR;
00841 
00842   TileIndex end_tile = p1;
00843   RoadType rt = Extract<RoadType, 3, 2>(p2);
00844   if (!IsValidRoadType(rt)) return CMD_ERROR;
00845 
00846   Axis axis = Extract<Axis, 2, 1>(p2);
00847   /* Only drag in X or Y direction dictated by the direction variable */
00848   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00849   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00850 
00851   /* Swap start and ending tile, also the half-tile drag var (bit 0 and 1) */
00852   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00853     TileIndex t = start_tile;
00854     start_tile = end_tile;
00855     end_tile = t;
00856     p2 ^= IsInsideMM(p2 & 3, 1, 3) ? 3 : 0;
00857   }
00858 
00859   Money money = GetAvailableMoneyForCommand();
00860   TileIndex tile = start_tile;
00861   CommandCost last_error = CMD_ERROR;
00862   bool had_success = false;
00863   /* Start tile is the small number. */
00864   for (;;) {
00865     RoadBits bits = AxisToRoadBits(axis);
00866 
00867     if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
00868     if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
00869 
00870     /* try to remove the halves. */
00871     if (bits != 0) {
00872       CommandCost ret = RemoveRoad(tile, flags & ~DC_EXEC, bits, rt, true);
00873       if (ret.Succeeded()) {
00874         if (flags & DC_EXEC) {
00875           money -= ret.GetCost();
00876           if (money < 0) {
00877             _additional_cash_required = DoCommand(start_tile, end_tile, p2, flags & ~DC_EXEC, CMD_REMOVE_LONG_ROAD).GetCost();
00878             return cost;
00879           }
00880           RemoveRoad(tile, flags, bits, rt, true, false);
00881         }
00882         cost.AddCost(ret);
00883         had_success = true;
00884       } else {
00885         /* Ownership errors are more important. */
00886         if (last_error.GetErrorMessage() != STR_ERROR_OWNED_BY) last_error = ret;
00887       }
00888     }
00889 
00890     if (tile == end_tile) break;
00891 
00892     tile += (axis == AXIS_Y) ? TileDiffXY(0, 1) : TileDiffXY(1, 0);
00893   }
00894 
00895   return had_success ? cost : last_error;
00896 }
00897 
00911 CommandCost CmdBuildRoadDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00912 {
00913   DiagDirection dir = Extract<DiagDirection, 0, 2>(p1);
00914   RoadType rt = Extract<RoadType, 2, 2>(p1);
00915 
00916   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00917 
00918   Slope tileh = GetTileSlope(tile, NULL);
00919   if (tileh != SLOPE_FLAT && (
00920         !_settings_game.construction.build_on_slopes ||
00921         IsSteepSlope(tileh) ||
00922         !CanBuildDepotByTileh(dir, tileh)
00923       )) {
00924     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00925   }
00926 
00927   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00928   if (cost.Failed()) return cost;
00929 
00930   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
00931 
00932   if (!Depot::CanAllocateItem()) return CMD_ERROR;
00933 
00934   if (flags & DC_EXEC) {
00935     Depot *dep = new Depot(tile);
00936     dep->build_date = _date;
00937 
00938     MakeRoadDepot(tile, _current_company, dep->index, dir, rt);
00939     MarkTileDirtyByTile(tile);
00940     MakeDefaultName(dep);
00941   }
00942   cost.AddCost(_price[PR_BUILD_DEPOT_ROAD]);
00943   return cost;
00944 }
00945 
00946 static CommandCost RemoveRoadDepot(TileIndex tile, DoCommandFlag flags)
00947 {
00948   if (_current_company != OWNER_WATER) {
00949     CommandCost ret = CheckTileOwnership(tile);
00950     if (ret.Failed()) return ret;
00951   }
00952 
00953   CommandCost ret = EnsureNoVehicleOnGround(tile);
00954   if (ret.Failed()) return ret;
00955 
00956   if (flags & DC_EXEC) {
00957     delete Depot::GetByTile(tile);
00958     DoClearSquare(tile);
00959   }
00960 
00961   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_ROAD]);
00962 }
00963 
00964 static CommandCost ClearTile_Road(TileIndex tile, DoCommandFlag flags)
00965 {
00966   switch (GetRoadTileType(tile)) {
00967     case ROAD_TILE_NORMAL: {
00968       RoadBits b = GetAllRoadBits(tile);
00969 
00970       /* Clear the road if only one piece is on the tile OR we are not using the DC_AUTO flag */
00971       if ((HasExactlyOneBit(b) && GetRoadBits(tile, ROADTYPE_TRAM) == ROAD_NONE) || !(flags & DC_AUTO)) {
00972         CommandCost ret(EXPENSES_CONSTRUCTION);
00973         RoadType rt;
00974         FOR_EACH_SET_ROADTYPE(rt, GetRoadTypes(tile)) {
00975           CommandCost tmp_ret = RemoveRoad(tile, flags, GetRoadBits(tile, rt), rt, true);
00976           if (tmp_ret.Failed()) return tmp_ret;
00977           ret.AddCost(tmp_ret);
00978         }
00979         return ret;
00980       }
00981       return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
00982     }
00983 
00984     case ROAD_TILE_CROSSING: {
00985       RoadTypes rts = GetRoadTypes(tile);
00986       CommandCost ret(EXPENSES_CONSTRUCTION);
00987 
00988       if (flags & DC_AUTO) return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
00989 
00990       /* Must iterate over the roadtypes in a reverse manner because
00991        * tram tracks must be removed before the road bits. */
00992       RoadType rt = ROADTYPE_TRAM;
00993       do {
00994         if (HasBit(rts, rt)) {
00995           CommandCost tmp_ret = RemoveRoad(tile, flags, GetCrossingRoadBits(tile), rt, false);
00996           if (tmp_ret.Failed()) return tmp_ret;
00997           ret.AddCost(tmp_ret);
00998         }
00999       } while (rt-- != ROADTYPE_ROAD);
01000 
01001       if (flags & DC_EXEC) {
01002         DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
01003       }
01004       return ret;
01005     }
01006 
01007     default:
01008     case ROAD_TILE_DEPOT:
01009       if (flags & DC_AUTO) {
01010         return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
01011       }
01012       return RemoveRoadDepot(tile, flags);
01013   }
01014 }
01015 
01016 
01017 struct DrawRoadTileStruct {
01018   uint16 image;
01019   byte subcoord_x;
01020   byte subcoord_y;
01021 };
01022 
01023 #include "table/road_land.h"
01024 
01032 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits)
01033 {
01034   /* Flat land and land without a road doesn't require a foundation */
01035   if (tileh == SLOPE_FLAT || bits == ROAD_NONE) return FOUNDATION_NONE;
01036 
01037   if (!IsSteepSlope(tileh)) {
01038     /* Leveled RoadBits on a slope */
01039     if ((_invalid_tileh_slopes_road[0][tileh] & bits) == ROAD_NONE) return FOUNDATION_LEVELED;
01040 
01041     /* Straight roads without foundation on a slope */
01042     if (!IsSlopeWithOneCornerRaised(tileh) &&
01043         (_invalid_tileh_slopes_road[1][tileh] & bits) == ROAD_NONE)
01044       return FOUNDATION_NONE;
01045   }
01046 
01047   /* Roads on steep Slopes or on Slopes with one corner raised */
01048   return (bits == ROAD_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
01049 }
01050 
01051 const byte _road_sloped_sprites[14] = {
01052   0,  0,  2,  0,
01053   0,  1,  0,  0,
01054   3,  0,  0,  0,
01055   0,  0
01056 };
01057 
01068 static bool AlwaysDrawUnpavedRoads(TileIndex tile, Roadside roadside)
01069 {
01070   return (IsOnSnow(tile) &&
01071       !(_settings_game.game_creation.landscape == LT_TROPIC && HasGrfMiscBit(GMB_DESERT_PAVED_ROADS) &&
01072         roadside != ROADSIDE_BARREN && roadside != ROADSIDE_GRASS && roadside != ROADSIDE_GRASS_ROAD_WORKS));
01073 }
01074 
01080 void DrawTramCatenary(const TileInfo *ti, RoadBits tram)
01081 {
01082   /* Do not draw catenary if it is invisible */
01083   if (IsInvisibilitySet(TO_CATENARY)) return;
01084 
01085   /* Don't draw the catenary under a low bridge */
01086   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_CATENARY)) {
01087     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01088 
01089     if (height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) return;
01090   }
01091 
01092   SpriteID front;
01093   SpriteID back;
01094 
01095   if (ti->tileh != SLOPE_FLAT) {
01096     back  = SPR_TRAMWAY_BACK_WIRES_SLOPED  + _road_sloped_sprites[ti->tileh - 1];
01097     front = SPR_TRAMWAY_FRONT_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
01098   } else {
01099     back  = SPR_TRAMWAY_BASE + _road_backpole_sprites_1[tram];
01100     front = SPR_TRAMWAY_BASE + _road_frontwire_sprites_1[tram];
01101   }
01102 
01103   AddSortableSpriteToDraw(back,  PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01104   AddSortableSpriteToDraw(front, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01105 }
01106 
01115 static void DrawRoadDetail(SpriteID img, const TileInfo *ti, int dx, int dy, int h)
01116 {
01117   int x = ti->x | dx;
01118   int y = ti->y | dy;
01119   byte z = ti->z;
01120   if (ti->tileh != SLOPE_FLAT) z = GetSlopeZ(x, y);
01121   AddSortableSpriteToDraw(img, PAL_NONE, x, y, 2, 2, h, z);
01122 }
01123 
01128 static void DrawRoadBits(TileInfo *ti)
01129 {
01130   RoadBits road = GetRoadBits(ti->tile, ROADTYPE_ROAD);
01131   RoadBits tram = GetRoadBits(ti->tile, ROADTYPE_TRAM);
01132 
01133   SpriteID image = 0;
01134   PaletteID pal = PAL_NONE;
01135 
01136   if (ti->tileh != SLOPE_FLAT) {
01137     DrawFoundation(ti, GetRoadFoundation(ti->tileh, road | tram));
01138 
01139     /* DrawFoundation() modifies ti.
01140      * Default sloped sprites.. */
01141     if (ti->tileh != SLOPE_FLAT) image = _road_sloped_sprites[ti->tileh - 1] + 0x53F;
01142   }
01143 
01144   if (image == 0) image = _road_tile_sprites_1[road != ROAD_NONE ? road : tram];
01145 
01146   Roadside roadside = GetRoadside(ti->tile);
01147 
01148   if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01149     image += 19;
01150   } else {
01151     switch (roadside) {
01152       case ROADSIDE_BARREN:           pal = PALETTE_TO_BARE_LAND; break;
01153       case ROADSIDE_GRASS:            break;
01154       case ROADSIDE_GRASS_ROAD_WORKS: break;
01155       default:                        image -= 19; break; // Paved
01156     }
01157   }
01158 
01159   DrawGroundSprite(image, pal);
01160 
01161   /* For tram we overlay the road graphics with either tram tracks only
01162    * (when there is actual road beneath the trams) or with tram tracks
01163    * and some dirts which hides the road graphics */
01164   if (tram != ROAD_NONE) {
01165     if (ti->tileh != SLOPE_FLAT) {
01166       image = _road_sloped_sprites[ti->tileh - 1] + SPR_TRAMWAY_SLOPED_OFFSET;
01167     } else {
01168       image = _road_tile_sprites_1[tram] - SPR_ROAD_Y;
01169     }
01170     image += (road == ROAD_NONE) ? SPR_TRAMWAY_TRAM : SPR_TRAMWAY_OVERLAY;
01171     DrawGroundSprite(image, pal);
01172   }
01173 
01174   if (road != ROAD_NONE) {
01175     DisallowedRoadDirections drd = GetDisallowedRoadDirections(ti->tile);
01176     if (drd != DRD_NONE) {
01177       DrawGroundSpriteAt(SPR_ONEWAY_BASE + drd - 1 + ((road == ROAD_X) ? 0 : 3), PAL_NONE, 8, 8, GetPartialZ(8, 8, ti->tileh));
01178     }
01179   }
01180 
01181   if (HasRoadWorks(ti->tile)) {
01182     /* Road works */
01183     DrawGroundSprite((road | tram) & ROAD_X ? SPR_EXCAVATION_X : SPR_EXCAVATION_Y, PAL_NONE);
01184     return;
01185   }
01186 
01187   if (tram != ROAD_NONE) DrawTramCatenary(ti, tram);
01188 
01189   /* Return if full detail is disabled, or we are zoomed fully out. */
01190   if (!HasBit(_display_opt, DO_FULL_DETAIL) || _cur_dpi->zoom > ZOOM_LVL_DETAIL) return;
01191 
01192   /* Do not draw details (street lights, trees) under low bridge */
01193   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && (roadside == ROADSIDE_TREES || roadside == ROADSIDE_STREET_LIGHTS)) {
01194     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01195     uint minz = GetTileMaxZ(ti->tile) + 2 * TILE_HEIGHT;
01196 
01197     if (roadside == ROADSIDE_TREES) minz += TILE_HEIGHT;
01198 
01199     if (height < minz) return;
01200   }
01201 
01202   /* If there are no road bits, return, as there is nothing left to do */
01203   if (HasAtMostOneBit(road)) return;
01204 
01205   /* Draw extra details. */
01206   for (const DrawRoadTileStruct *drts = _road_display_table[roadside][road | tram]; drts->image != 0; drts++) {
01207     DrawRoadDetail(drts->image, ti, drts->subcoord_x, drts->subcoord_y, 0x10);
01208   }
01209 }
01210 
01212 static void DrawTile_Road(TileInfo *ti)
01213 {
01214   switch (GetRoadTileType(ti->tile)) {
01215     case ROAD_TILE_NORMAL:
01216       DrawRoadBits(ti);
01217       break;
01218 
01219     case ROAD_TILE_CROSSING: {
01220       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01221 
01222       PaletteID pal = PAL_NONE;
01223       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
01224 
01225       if (rti->UsesOverlay()) {
01226         Axis axis = GetCrossingRailAxis(ti->tile);
01227         SpriteID road = SPR_ROAD_Y + axis;
01228 
01229         Roadside roadside = GetRoadside(ti->tile);
01230 
01231         if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01232           road += 19;
01233         } else {
01234           switch (roadside) {
01235             case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
01236             case ROADSIDE_GRASS:  break;
01237             default:              road -= 19; break; // Paved
01238           }
01239         }
01240 
01241         DrawGroundSprite(road, pal);
01242 
01243         SpriteID rail = GetCustomRailSprite(rti, ti->tile, RTSG_CROSSING) + axis;
01244         /* Draw tracks, but draw PBS reserved tracks darker. */
01245         pal = (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) ? PALETTE_CRASH : PAL_NONE;
01246         DrawGroundSprite(rail, pal);
01247 
01248         DrawRailTileSeq(ti, &_crossing_layout, TO_CATENARY, rail, 0, PAL_NONE);
01249       } else {
01250         SpriteID image = rti->base_sprites.crossing;
01251 
01252         if (GetCrossingRoadAxis(ti->tile) == AXIS_X) image++;
01253         if (IsCrossingBarred(ti->tile)) image += 2;
01254 
01255         Roadside roadside = GetRoadside(ti->tile);
01256 
01257         if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01258           image += 8;
01259         } else {
01260           switch (roadside) {
01261             case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
01262             case ROADSIDE_GRASS:  break;
01263             default:              image += 4; break; // Paved
01264           }
01265         }
01266 
01267         DrawGroundSprite(image, pal);
01268 
01269         /* PBS debugging, draw reserved tracks darker */
01270         if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) {
01271           DrawGroundSprite(GetCrossingRoadAxis(ti->tile) == AXIS_Y ? GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_x : GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_y, PALETTE_CRASH);
01272         }
01273       }
01274 
01275       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01276         DrawGroundSprite(SPR_TRAMWAY_OVERLAY + (GetCrossingRoadAxis(ti->tile) ^ 1), pal);
01277         DrawTramCatenary(ti, GetCrossingRoadBits(ti->tile));
01278       }
01279       if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01280       break;
01281     }
01282 
01283     default:
01284     case ROAD_TILE_DEPOT: {
01285       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01286 
01287       PaletteID palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
01288 
01289       const DrawTileSprites *dts;
01290       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01291         dts =  &_tram_depot[GetRoadDepotDirection(ti->tile)];
01292       } else {
01293         dts =  &_road_depot[GetRoadDepotDirection(ti->tile)];
01294       }
01295 
01296       DrawGroundSprite(dts->ground.sprite, PAL_NONE);
01297       DrawOrigTileSeq(ti, dts, TO_BUILDINGS, palette);
01298       break;
01299     }
01300   }
01301   DrawBridgeMiddle(ti);
01302 }
01303 
01304 void DrawRoadDepotSprite(int x, int y, DiagDirection dir, RoadType rt)
01305 {
01306   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
01307   const DrawTileSprites *dts = (rt == ROADTYPE_TRAM) ? &_tram_depot[dir] : &_road_depot[dir];
01308 
01309   x += 33;
01310   y += 17;
01311 
01312   DrawSprite(dts->ground.sprite, PAL_NONE, x, y);
01313   DrawOrigTileSeqInGUI(x, y, dts, palette);
01314 }
01315 
01321 void UpdateNearestTownForRoadTiles(bool invalidate)
01322 {
01323   assert(!invalidate || _generating_world);
01324 
01325   for (TileIndex t = 0; t < MapSize(); t++) {
01326     if (IsTileType(t, MP_ROAD) && !IsRoadDepot(t) && !HasTownOwnedRoad(t)) {
01327       TownID tid = (TownID)INVALID_TOWN;
01328       if (!invalidate) {
01329         const Town *town = CalcClosestTownFromTile(t);
01330         if (town != NULL) tid = town->index;
01331       }
01332       SetTownIndex(t, tid);
01333     }
01334   }
01335 }
01336 
01337 static uint GetSlopeZ_Road(TileIndex tile, uint x, uint y)
01338 {
01339   uint z;
01340   Slope tileh = GetTileSlope(tile, &z);
01341 
01342   if (tileh == SLOPE_FLAT) return z;
01343   if (IsNormalRoad(tile)) {
01344     Foundation f = GetRoadFoundation(tileh, GetAllRoadBits(tile));
01345     z += ApplyFoundationToSlope(f, &tileh);
01346     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
01347   } else {
01348     return z + TILE_HEIGHT;
01349   }
01350 }
01351 
01352 static Foundation GetFoundation_Road(TileIndex tile, Slope tileh)
01353 {
01354   if (IsNormalRoad(tile)) {
01355     return GetRoadFoundation(tileh, GetAllRoadBits(tile));
01356   } else {
01357     return FlatteningFoundation(tileh);
01358   }
01359 }
01360 
01361 static const Roadside _town_road_types[][2] = {
01362   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01363   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01364   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01365   { ROADSIDE_TREES,         ROADSIDE_TREES },
01366   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01367 };
01368 
01369 static const Roadside _town_road_types_2[][2] = {
01370   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01371   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01372   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01373   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01374   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01375 };
01376 
01377 
01378 static void TileLoop_Road(TileIndex tile)
01379 {
01380   switch (_settings_game.game_creation.landscape) {
01381     case LT_ARCTIC:
01382       if (IsOnSnow(tile) != (GetTileZ(tile) > GetSnowLine())) {
01383         ToggleSnow(tile);
01384         MarkTileDirtyByTile(tile);
01385       }
01386       break;
01387 
01388     case LT_TROPIC:
01389       if (GetTropicZone(tile) == TROPICZONE_DESERT && !IsOnDesert(tile)) {
01390         ToggleDesert(tile);
01391         MarkTileDirtyByTile(tile);
01392       }
01393       break;
01394   }
01395 
01396   if (IsRoadDepot(tile)) return;
01397 
01398   const Town *t = ClosestTownFromTile(tile, UINT_MAX);
01399   if (!HasRoadWorks(tile)) {
01400     HouseZonesBits grp = HZB_TOWN_EDGE;
01401 
01402     if (t != NULL) {
01403       grp = GetTownRadiusGroup(t, tile);
01404 
01405       /* Show an animation to indicate road work */
01406       if (t->road_build_months != 0 &&
01407           (DistanceManhattan(t->xy, tile) < 8 || grp != HZB_TOWN_EDGE) &&
01408           IsNormalRoad(tile) && !HasAtMostOneBit(GetAllRoadBits(tile))) {
01409         if (GetFoundationSlope(tile, NULL) == SLOPE_FLAT && EnsureNoVehicleOnGround(tile).Succeeded() && Chance16(1, 40)) {
01410           StartRoadWorks(tile);
01411 
01412           SndPlayTileFx(SND_21_JACKHAMMER, tile);
01413           CreateEffectVehicleAbove(
01414             TileX(tile) * TILE_SIZE + 7,
01415             TileY(tile) * TILE_SIZE + 7,
01416             0,
01417             EV_BULLDOZER);
01418           MarkTileDirtyByTile(tile);
01419           return;
01420         }
01421       }
01422     }
01423 
01424     {
01425       /* Adjust road ground type depending on 'grp' (grp is the distance to the center) */
01426       const Roadside *new_rs = (_settings_game.game_creation.landscape == LT_TOYLAND) ? _town_road_types_2[grp] : _town_road_types[grp];
01427       Roadside cur_rs = GetRoadside(tile);
01428 
01429       /* We have our desired type, do nothing */
01430       if (cur_rs == new_rs[0]) return;
01431 
01432       /* We have the pre-type of the desired type, switch to the desired type */
01433       if (cur_rs == new_rs[1]) {
01434         cur_rs = new_rs[0];
01435       /* We have barren land, install the pre-type */
01436       } else if (cur_rs == ROADSIDE_BARREN) {
01437         cur_rs = new_rs[1];
01438       /* We're totally off limits, remove any installation and make barren land */
01439       } else {
01440         cur_rs = ROADSIDE_BARREN;
01441       }
01442       SetRoadside(tile, cur_rs);
01443       MarkTileDirtyByTile(tile);
01444     }
01445   } else if (IncreaseRoadWorksCounter(tile)) {
01446     TerminateRoadWorks(tile);
01447 
01448     if (_settings_game.economy.mod_road_rebuild) {
01449       /* Generate a nicer town surface */
01450       const RoadBits old_rb = GetAnyRoadBits(tile, ROADTYPE_ROAD);
01451       const RoadBits new_rb = CleanUpRoadBits(tile, old_rb);
01452 
01453       if (old_rb != new_rb) {
01454         RemoveRoad(tile, DC_EXEC | DC_AUTO | DC_NO_WATER, (old_rb ^ new_rb), ROADTYPE_ROAD, true);
01455       }
01456     }
01457 
01458     MarkTileDirtyByTile(tile);
01459   }
01460 }
01461 
01462 static bool ClickTile_Road(TileIndex tile)
01463 {
01464   if (!IsRoadDepot(tile)) return false;
01465 
01466   ShowDepotWindow(tile, VEH_ROAD);
01467   return true;
01468 }
01469 
01470 /* Converts RoadBits to TrackBits */
01471 static const byte _road_trackbits[16] = {
01472   0x0, 0x0, 0x0, 0x10, 0x0, 0x2, 0x8, 0x1A, 0x0, 0x4, 0x1, 0x15, 0x20, 0x26, 0x29, 0x3F,
01473 };
01474 
01475 static TrackStatus GetTileTrackStatus_Road(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
01476 {
01477   TrackdirBits trackdirbits = TRACKDIR_BIT_NONE;
01478   TrackdirBits red_signals = TRACKDIR_BIT_NONE; // crossing barred
01479   switch (mode) {
01480     case TRANSPORT_RAIL:
01481       if (IsLevelCrossing(tile)) trackdirbits = TrackBitsToTrackdirBits(GetCrossingRailBits(tile));
01482       break;
01483 
01484     case TRANSPORT_ROAD:
01485       if ((GetRoadTypes(tile) & sub_mode) == 0) break;
01486       switch (GetRoadTileType(tile)) {
01487         case ROAD_TILE_NORMAL: {
01488           const uint drd_to_multiplier[DRD_END] = { 0x101, 0x100, 0x1, 0x0 };
01489           RoadType rt = (RoadType)FindFirstBit(sub_mode);
01490           RoadBits bits = GetRoadBits(tile, rt);
01491 
01492           /* no roadbit at this side of tile, return 0 */
01493           if (side != INVALID_DIAGDIR && (DiagDirToRoadBits(side) & bits) == 0) break;
01494 
01495           uint multiplier = drd_to_multiplier[rt == ROADTYPE_TRAM ? DRD_NONE : GetDisallowedRoadDirections(tile)];
01496           if (!HasRoadWorks(tile)) trackdirbits = (TrackdirBits)(_road_trackbits[bits] * multiplier);
01497           break;
01498         }
01499 
01500         case ROAD_TILE_CROSSING: {
01501           Axis axis = GetCrossingRoadAxis(tile);
01502 
01503           if (side != INVALID_DIAGDIR && axis != DiagDirToAxis(side)) break;
01504 
01505           trackdirbits = TrackBitsToTrackdirBits(AxisToTrackBits(axis));
01506           if (IsCrossingBarred(tile)) red_signals = trackdirbits;
01507           break;
01508         }
01509 
01510         default:
01511         case ROAD_TILE_DEPOT: {
01512           DiagDirection dir = GetRoadDepotDirection(tile);
01513 
01514           if (side != INVALID_DIAGDIR && side != dir) break;
01515 
01516           trackdirbits = TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir));
01517           break;
01518         }
01519       }
01520       break;
01521 
01522     default: break;
01523   }
01524   return CombineTrackStatus(trackdirbits, red_signals);
01525 }
01526 
01527 static const StringID _road_tile_strings[] = {
01528   STR_LAI_ROAD_DESCRIPTION_ROAD,
01529   STR_LAI_ROAD_DESCRIPTION_ROAD,
01530   STR_LAI_ROAD_DESCRIPTION_ROAD,
01531   STR_LAI_ROAD_DESCRIPTION_ROAD_WITH_STREETLIGHTS,
01532   STR_LAI_ROAD_DESCRIPTION_ROAD,
01533   STR_LAI_ROAD_DESCRIPTION_TREE_LINED_ROAD,
01534   STR_LAI_ROAD_DESCRIPTION_ROAD,
01535   STR_LAI_ROAD_DESCRIPTION_ROAD,
01536 };
01537 
01538 static void GetTileDesc_Road(TileIndex tile, TileDesc *td)
01539 {
01540   Owner rail_owner = INVALID_OWNER;
01541   Owner road_owner = INVALID_OWNER;
01542   Owner tram_owner = INVALID_OWNER;
01543 
01544   switch (GetRoadTileType(tile)) {
01545     case ROAD_TILE_CROSSING: {
01546       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_RAIL_LEVEL_CROSSING;
01547       RoadTypes rts = GetRoadTypes(tile);
01548       rail_owner = GetTileOwner(tile);
01549       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01550       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01551 
01552       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
01553       td->rail_speed = rti->max_speed;
01554 
01555       break;
01556     }
01557 
01558     case ROAD_TILE_DEPOT:
01559       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_VEHICLE_DEPOT;
01560       road_owner = GetTileOwner(tile); // Tile has only one owner, roadtype does not matter
01561       td->build_date = Depot::GetByTile(tile)->build_date;
01562       break;
01563 
01564     default: {
01565       RoadTypes rts = GetRoadTypes(tile);
01566       td->str = (HasBit(rts, ROADTYPE_ROAD) ? _road_tile_strings[GetRoadside(tile)] : STR_LAI_ROAD_DESCRIPTION_TRAMWAY);
01567       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01568       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01569       break;
01570     }
01571   }
01572 
01573   /* Now we have to discover, if the tile has only one owner or many:
01574    *   - Find a first_owner of the tile. (Currently road or tram must be present, but this will break when the third type becomes available)
01575    *   - Compare the found owner with the other owners, and test if they differ.
01576    * Note: If road exists it will be the first_owner.
01577    */
01578   Owner first_owner = (road_owner == INVALID_OWNER ? tram_owner : road_owner);
01579   bool mixed_owners = (tram_owner != INVALID_OWNER && tram_owner != first_owner) || (rail_owner != INVALID_OWNER && rail_owner != first_owner);
01580 
01581   if (mixed_owners) {
01582     /* Multiple owners */
01583     td->owner_type[0] = (rail_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_RAIL_OWNER);
01584     td->owner[0] = rail_owner;
01585     td->owner_type[1] = (road_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_ROAD_OWNER);
01586     td->owner[1] = road_owner;
01587     td->owner_type[2] = (tram_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_TRAM_OWNER);
01588     td->owner[2] = tram_owner;
01589   } else {
01590     /* One to rule them all */
01591     td->owner[0] = first_owner;
01592   }
01593 }
01594 
01599 static const byte _roadveh_enter_depot_dir[4] = {
01600   TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE
01601 };
01602 
01603 static VehicleEnterTileStatus VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
01604 {
01605   switch (GetRoadTileType(tile)) {
01606     case ROAD_TILE_DEPOT: {
01607       if (v->type != VEH_ROAD) break;
01608 
01609       RoadVehicle *rv = RoadVehicle::From(v);
01610       if (rv->frame == RVC_DEPOT_STOP_FRAME &&
01611           _roadveh_enter_depot_dir[GetRoadDepotDirection(tile)] == rv->state) {
01612         rv->state = RVSB_IN_DEPOT;
01613         rv->vehstatus |= VS_HIDDEN;
01614         rv->direction = ReverseDir(rv->direction);
01615         if (rv->Next() == NULL) VehicleEnterDepot(rv->First());
01616         rv->tile = tile;
01617 
01618         InvalidateWindowData(WC_VEHICLE_DEPOT, rv->tile);
01619         return VETSB_ENTERED_WORMHOLE;
01620       }
01621       break;
01622     }
01623 
01624     default: break;
01625   }
01626   return VETSB_CONTINUE;
01627 }
01628 
01629 
01630 static void ChangeTileOwner_Road(TileIndex tile, Owner old_owner, Owner new_owner)
01631 {
01632   if (IsRoadDepot(tile)) {
01633     if (GetTileOwner(tile) == old_owner) {
01634       if (new_owner == INVALID_OWNER) {
01635         DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
01636       } else {
01637         SetTileOwner(tile, new_owner);
01638       }
01639     }
01640     return;
01641   }
01642 
01643   for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
01644     /* Update all roadtypes, no matter if they are present */
01645     if (GetRoadOwner(tile, rt) == old_owner) {
01646       SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
01647     }
01648   }
01649 
01650   if (IsLevelCrossing(tile)) {
01651     if (GetTileOwner(tile) == old_owner) {
01652       if (new_owner == INVALID_OWNER) {
01653         DoCommand(tile, 0, GetCrossingRailTrack(tile), DC_EXEC | DC_BANKRUPT, CMD_REMOVE_SINGLE_RAIL);
01654       } else {
01655         SetTileOwner(tile, new_owner);
01656       }
01657     }
01658   }
01659 }
01660 
01661 static CommandCost TerraformTile_Road(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
01662 {
01663   if (_settings_game.construction.build_on_slopes && AutoslopeEnabled()) {
01664     switch (GetRoadTileType(tile)) {
01665       case ROAD_TILE_CROSSING:
01666         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]);
01667         break;
01668 
01669       case ROAD_TILE_DEPOT:
01670         if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRoadDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01671         break;
01672 
01673       case ROAD_TILE_NORMAL: {
01674         RoadBits bits = GetAllRoadBits(tile);
01675         RoadBits bits_copy = bits;
01676         /* Check if the slope-road_bits combination is valid at all, i.e. it is safe to call GetRoadFoundation(). */
01677         if (CheckRoadSlope(tileh_new, &bits_copy, ROAD_NONE, ROAD_NONE).Succeeded()) {
01678           /* CheckRoadSlope() sometimes changes the road_bits, if it does not agree with them. */
01679           if (bits == bits_copy) {
01680             uint z_old;
01681             Slope tileh_old = GetTileSlope(tile, &z_old);
01682 
01683             /* Get the slope on top of the foundation */
01684             z_old += ApplyFoundationToSlope(GetRoadFoundation(tileh_old, bits), &tileh_old);
01685             z_new += ApplyFoundationToSlope(GetRoadFoundation(tileh_new, bits), &tileh_new);
01686 
01687             /* The surface slope must not be changed */
01688             if ((z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01689           }
01690         }
01691         break;
01692       }
01693 
01694       default: NOT_REACHED();
01695     }
01696   }
01697 
01698   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
01699 }
01700 
01702 extern const TileTypeProcs _tile_type_road_procs = {
01703   DrawTile_Road,           // draw_tile_proc
01704   GetSlopeZ_Road,          // get_slope_z_proc
01705   ClearTile_Road,          // clear_tile_proc
01706   NULL,                    // add_accepted_cargo_proc
01707   GetTileDesc_Road,        // get_tile_desc_proc
01708   GetTileTrackStatus_Road, // get_tile_track_status_proc
01709   ClickTile_Road,          // click_tile_proc
01710   NULL,                    // animate_tile_proc
01711   TileLoop_Road,           // tile_loop_clear
01712   ChangeTileOwner_Road,    // change_tile_owner_clear
01713   NULL,                    // add_produced_cargo_proc
01714   VehicleEnter_Road,       // vehicle_enter_tile_proc
01715   GetFoundation_Road,      // get_foundation_proc
01716   TerraformTile_Road,      // terraform_tile_proc
01717 };