# road_cmd.cpp

Go to the documentation of this file.

    00001 /* $Id: road_cmd.cpp 18986 2010-02-02 21:25:01Z terkhen $ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
    00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
    00008  */
    00009
    00012 #include "stdafx.h"
    00013 #include "cmd_helper.h"
    00014 #include "road_internal.h"
    00015 #include "landscape.h"
    00016 #include "viewport_func.h"
    00017 #include "command_func.h"
    00018 #include "pathfinder/yapf/yapf_cache.h"
    00019 #include "depot_base.h"
    00020 #include "newgrf.h"
    00021 #include "variables.h"
    00022 #include "autoslope.h"
    00023 #include "tunnelbridge_map.h"
    00024 #include "window_func.h"
    00025 #include "strings_func.h"
    00026 #include "vehicle_func.h"
    00027 #include "sound_func.h"
    00028 #include "tunnelbridge.h"
    00029 #include "cheat_type.h"
    00030 #include "functions.h"
    00031 #include "effectvehicle_func.h"
    00032 #include "effectvehicle_base.h"
    00033 #include "elrail_func.h"
    00034 #include "roadveh.h"
    00035 #include "town.h"
    00036 #include "company_base.h"
    00037 #include "core/random_func.hpp"
    00038
    00039 #include "table/strings.h"
    00040
    00045 bool RoadVehiclesAreBuilt()
    00046 {
    00047   const RoadVehicle *rv;
    00048   FOR_ALL_ROADVEHICLES(rv) return true;
    00049
    00050   return false;
    00051 }
    00052
    00053 #define M(x) (1 << (x))
    00054 /* Level crossings may only be built on these slopes */
    00055 static const uint32 VALID_LEVEL_CROSSING_SLOPES = (M(SLOPE_SEN) | M(SLOPE_ENW) | M(SLOPE_NWS) | M(SLOPE_NS) | M(SLOPE_WSE) | M(SLOPE_EW) | M(SLOPE_FLAT));
    00056 #undef M
    00057
    00058 /* Invalid RoadBits on slopes  */
    00059 static const RoadBits _invalid_tileh_slopes_road[2][15] = {
    00060   /* The inverse of the mixable RoadBits on a leveled slope */
    00061   {
    00062     ROAD_NONE,         // SLOPE_FLAT
    00063     ROAD_NE | ROAD_SE, // SLOPE_W
    00064     ROAD_NE | ROAD_NW, // SLOPE_S
    00065
    00066     ROAD_NE,           // SLOPE_SW
    00067     ROAD_NW | ROAD_SW, // SLOPE_E
    00068     ROAD_NONE,         // SLOPE_EW
    00069
    00070     ROAD_NW,           // SLOPE_SE
    00071     ROAD_NONE,         // SLOPE_WSE
    00072     ROAD_SE | ROAD_SW, // SLOPE_N
    00073
    00074     ROAD_SE,           // SLOPE_NW
    00075     ROAD_NONE,         // SLOPE_NS
    00076     ROAD_NONE,         // SLOPE_ENW
    00077
    00078     ROAD_SW,           // SLOPE_NE
    00079     ROAD_NONE,         // SLOPE_SEN
    00080     ROAD_NONE          // SLOPE_NWS
    00081   },
    00082   /* The inverse of the allowed straight roads on a slope
    00083    * (with and without a foundation). */
    00084   {
    00085     ROAD_NONE, // SLOPE_FLAT
    00086     ROAD_NONE, // SLOPE_W    Foundation
    00087     ROAD_NONE, // SLOPE_S    Foundation
    00088
    00089     ROAD_Y,    // SLOPE_SW
    00090     ROAD_NONE, // SLOPE_E    Foundation
    00091     ROAD_ALL,  // SLOPE_EW
    00092
    00093     ROAD_X,    // SLOPE_SE
    00094     ROAD_ALL,  // SLOPE_WSE
    00095     ROAD_NONE, // SLOPE_N    Foundation
    00096
    00097     ROAD_X,    // SLOPE_NW
    00098     ROAD_ALL,  // SLOPE_NS
    00099     ROAD_ALL,  // SLOPE_ENW
    00100
    00101     ROAD_Y,    // SLOPE_NE
    00102     ROAD_ALL,  // SLOPE_SEN
    00103     ROAD_ALL   // SLOPE_NW
    00104   }
    00105 };
    00106
    00107 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits);
    00108
    00119 bool CheckAllowRemoveRoad(TileIndex tile, RoadBits remove, Owner owner, RoadType rt, DoCommandFlag flags, bool town_check)
    00120 {
    00121   if (_game_mode == GM_EDITOR || remove == ROAD_NONE) return true;
    00122
    00123   /* Water can always flood and towns can always remove "normal" road pieces.
    00124    * Towns are not be allowed to remove non "normal" road pieces, like tram
    00125    * tracks as that would result in trams that cannot turn. */
    00126   if (_current_company == OWNER_WATER ||
    00127       (rt == ROADTYPE_ROAD && !Company::IsValidID(_current_company))) return true;
    00128
    00129   /* Only do the special processing if the road is owned
    00130    * by a town */
    00131   if (owner != OWNER_TOWN) return (owner == OWNER_NONE) || CheckOwnership(owner);
    00132
    00133   if (!town_check) return true;
    00134
    00135   if (_cheats.magic_bulldozer.value) return true;
    00136
    00137   Town *t = ClosestTownFromTile(tile, UINT_MAX);
    00138   if (t == NULL) return true;
    00139
    00140   /* check if you're allowed to remove the street owned by a town
    00141    * removal allowance depends on difficulty setting */
    00142   if (!CheckforTownRating(flags, t, ROAD_REMOVE)) return false;
    00143
    00144   /* Get a bitmask of which neighbouring roads has a tile */
    00145   RoadBits n = ROAD_NONE;
    00146   RoadBits present = GetAnyRoadBits(tile, rt);
    00147   if ((present & ROAD_NE) && (GetAnyRoadBits(TILE_ADDXY(tile, -1,  0), rt) & ROAD_SW)) n |= ROAD_NE;
    00148   if ((present & ROAD_SE) && (GetAnyRoadBits(TILE_ADDXY(tile,  0,  1), rt) & ROAD_NW)) n |= ROAD_SE;
    00149   if ((present & ROAD_SW) && (GetAnyRoadBits(TILE_ADDXY(tile,  1,  0), rt) & ROAD_NE)) n |= ROAD_SW;
    00150   if ((present & ROAD_NW) && (GetAnyRoadBits(TILE_ADDXY(tile,  0, -1), rt) & ROAD_SE)) n |= ROAD_NW;
    00151
    00152   int rating_decrease = RATING_ROAD_DOWN_STEP_EDGE;
    00153   /* If 0 or 1 bits are set in n, or if no bits that match the bits to remove,
    00154    * then allow it */
    00155   if (KillFirstBit(n) != ROAD_NONE && (n & remove) != ROAD_NONE) {
    00156     /* you can remove all kind of roads with extra dynamite */
    00157     if (!_settings_game.construction.extra_dynamite) {
    00158       SetDParam(0, t->index);
    00159       _error_message = STR_ERROR_LOCAL_AUTHORITY_REFUSES_TO_ALLOW_THIS;
    00160       return false;
    00161     }
    00162     rating_decrease = RATING_ROAD_DOWN_STEP_INNER;
    00163   }
    00164   ChangeTownRating(t, rating_decrease, RATING_ROAD_MINIMUM, flags);
    00165
    00166   return true;
    00167 }
    00168
    00169
    00178 static CommandCost RemoveRoad(TileIndex tile, DoCommandFlag flags, RoadBits pieces, RoadType rt, bool crossing_check, bool town_check = true)
    00179 {
    00180   RoadTypes rts = GetRoadTypes(tile);
    00181   /* The tile doesn't have the given road type */
    00182   if (!HasBit(rts, rt)) return CMD_ERROR;
    00183
    00184   switch (GetTileType(tile)) {
    00185     case MP_ROAD:
    00186       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00187       break;
    00188
    00189     case MP_STATION:
    00190       if (!IsDriveThroughStopTile(tile)) return CMD_ERROR;
    00191       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00192       break;
    00193
    00194     case MP_TUNNELBRIDGE:
    00195       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) return CMD_ERROR;
    00196       if (HasVehicleOnTunnelBridge(tile, GetOtherTunnelBridgeEnd(tile))) return CMD_ERROR;
    00197       break;
    00198
    00199     default:
    00200       return CMD_ERROR;
    00201   }
    00202
    00203   if (!CheckAllowRemoveRoad(tile, pieces, GetRoadOwner(tile, rt), rt, flags, town_check)) return CMD_ERROR;
    00204
    00205   if (!IsTileType(tile, MP_ROAD)) {
    00206     /* If it's the last roadtype, just clear the whole tile */
    00207     if (rts == RoadTypeToRoadTypes(rt)) return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00208
    00209     CommandCost cost(EXPENSES_CONSTRUCTION);
    00210     if (IsTileType(tile, MP_TUNNELBRIDGE)) {
    00211       TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
    00212       /* Pay for *every* tile of the bridge or tunnel */
    00213       cost.AddCost((GetTunnelBridgeLength(other_end, tile) + 2) * _price[PR_CLEAR_ROAD]);
    00214       if (flags & DC_EXEC) {
    00215         SetRoadTypes(other_end, GetRoadTypes(other_end) & ~RoadTypeToRoadTypes(rt));
    00216         SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
    00217
    00218         /* If the owner of the bridge sells all it's road, also move the ownership
    00219          * to the owner of the other roadtype. */
    00220         RoadType other_rt = (rt == ROADTYPE_ROAD) ? ROADTYPE_TRAM : ROADTYPE_ROAD;
    00221         Owner other_owner = GetRoadOwner(tile, other_rt);
    00222         if (other_owner != GetTileOwner(tile)) {
    00223           SetTileOwner(tile, other_owner);
    00224           SetTileOwner(other_end, other_owner);
    00225         }
    00226
    00227         /* Mark tiles diry that have been repaved */
    00228         MarkTileDirtyByTile(tile);
    00229         MarkTileDirtyByTile(other_end);
    00230         if (IsBridge(tile)) {
    00231           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
    00232
    00233           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
    00234         }
    00235       }
    00236     } else {
    00237       assert(IsDriveThroughStopTile(tile));
    00238       cost.AddCost(_price[PR_CLEAR_ROAD] * 2);
    00239       if (flags & DC_EXEC) {
    00240         SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
    00241         MarkTileDirtyByTile(tile);
    00242       }
    00243     }
    00244     return cost;
    00245   }
    00246
    00247   switch (GetRoadTileType(tile)) {
    00248     case ROAD_TILE_NORMAL: {
    00249       const Slope tileh = GetTileSlope(tile, NULL);
    00250       RoadBits present = GetRoadBits(tile, rt);
    00251       const RoadBits other = GetOtherRoadBits(tile, rt);
    00252       const Foundation f = GetRoadFoundation(tileh, present);
    00253
    00254       if (HasRoadWorks(tile) && _current_company != OWNER_WATER) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
    00255
    00256       /* Autocomplete to a straight road
    00257        * @li on steep slopes
    00258        * @li if the bits of the other roadtypes result in another foundation
    00259        * @li if build on slopes is disabled */
    00260       if (IsSteepSlope(tileh) || (IsStraightRoad(other) &&
    00261           (other & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) != ROAD_NONE) ||
    00262           (tileh != SLOPE_FLAT && !_settings_game.construction.build_on_slopes)) {
    00263         pieces |= MirrorRoadBits(pieces);
    00264       }
    00265
    00266       /* limit the bits to delete to the existing bits. */
    00267       pieces &= present;
    00268       if (pieces == ROAD_NONE) return CMD_ERROR;
    00269
    00270       /* Now set present what it will be after the remove */
    00271       present ^= pieces;
    00272
    00273       /* Check for invalid RoadBit combinations on slopes */
    00274       if (tileh != SLOPE_FLAT && present != ROAD_NONE &&
    00275           (present & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) == present) {
    00276         return CMD_ERROR;
    00277       }
    00278
    00279       if (flags & DC_EXEC) {
    00280         if (HasRoadWorks(tile)) {
    00281           /* flooding tile with road works, don't forget to remove the effect vehicle too */
    00282           assert(_current_company == OWNER_WATER);
    00283           EffectVehicle *v;
    00284           FOR_ALL_EFFECTVEHICLES(v) {
    00285             if (TileVirtXY(v->x_pos, v->y_pos) == tile) {
    00286               delete v;
    00287             }
    00288           }
    00289         }
    00290         if (present == ROAD_NONE) {
    00291           RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));
    00292           if (rts == ROADTYPES_NONE) {
    00293             /* Includes MarkTileDirtyByTile() */
    00294             DoClearSquare(tile);
    00295           } else {
    00296             if (rt == ROADTYPE_ROAD && IsRoadOwner(tile, ROADTYPE_ROAD, OWNER_TOWN)) {
    00297               /* Update nearest-town index */
    00298               const Town *town = CalcClosestTownFromTile(tile);
    00299               SetTownIndex(tile, town == NULL ? (TownID)INVALID_TOWN : town->index);
    00300             }
    00301             SetRoadBits(tile, ROAD_NONE, rt);
    00302             SetRoadTypes(tile, rts);
    00303             MarkTileDirtyByTile(tile);
    00304           }
    00305         } else {
    00306           /* When bits are removed, you *always* end up with something that
    00307            * is not a complete straight road tile. However, trams do not have
    00308            * onewayness, so they cannot remove it either. */
    00309           if (rt != ROADTYPE_TRAM) SetDisallowedRoadDirections(tile, DRD_NONE);
    00310           SetRoadBits(tile, present, rt);
    00311           MarkTileDirtyByTile(tile);
    00312         }
    00313       }
    00314
    00315       /* If we change the foundation we have to pay for it. */
    00316       return CommandCost(EXPENSES_CONSTRUCTION, CountBits(pieces) * _price[PR_CLEAR_ROAD] +
    00317           ((GetRoadFoundation(tileh, present) != f) ? _price[PR_BUILD_FOUNDATION] : (Money)0));
    00318     }
    00319
    00320     case ROAD_TILE_CROSSING: {
    00321       if (pieces & ComplementRoadBits(GetCrossingRoadBits(tile))) {
    00322         return CMD_ERROR;
    00323       }
    00324
    00325       /* Don't allow road to be removed from the crossing when there is tram;
    00326        * we can't draw the crossing without roadbits ;) */
    00327       if (rt == ROADTYPE_ROAD && HasTileRoadType(tile, ROADTYPE_TRAM) && (flags & DC_EXEC || crossing_check)) return CMD_ERROR;
    00328
    00329       if (flags & DC_EXEC) {
    00330         Track railtrack = GetCrossingRailTrack(tile);
    00331         RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));
    00332         if (rts == ROADTYPES_NONE) {
    00333           TrackBits tracks = GetCrossingRailBits(tile);
    00334           bool reserved = HasCrossingReservation(tile);
    00335           MakeRailNormal(tile, GetTileOwner(tile), tracks, GetRailType(tile));
    00336           if (reserved) SetTrackReservation(tile, tracks);
    00337         } else {
    00338           SetRoadTypes(tile, rts);
    00339           /* If we ever get HWAY and it is possible without road then we will need to promote ownership and invalidate town index here, too */
    00340         }
    00341         MarkTileDirtyByTile(tile);
    00342         YapfNotifyTrackLayoutChange(tile, railtrack);
    00343       }
    00344       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_ROAD] * 2);
    00345     }
    00346
    00347     default:
    00348     case ROAD_TILE_DEPOT:
    00349       return CMD_ERROR;
    00350   }
    00351 }
    00352
    00353
    00365 static CommandCost CheckRoadSlope(Slope tileh, RoadBits *pieces, RoadBits existing, RoadBits other)
    00366 {
    00367   /* Remove already build pieces */
    00368   CLRBITS(*pieces, existing);
    00369
    00370   /* If we can't build anything stop here */
    00371   if (*pieces == ROAD_NONE) return CMD_ERROR;
    00372
    00373   /* All RoadBit combos are valid on flat land */
    00374   if (tileh == SLOPE_FLAT) return CommandCost();
    00375
    00376   /* Proceed steep Slopes first to reduce lookup table size */
    00377   if (IsSteepSlope(tileh)) {
    00378     /* Force straight roads. */
    00379     *pieces |= MirrorRoadBits(*pieces);
    00380
    00381     /* Use existing as all existing since only straight
    00382      * roads are allowed here. */
    00383     existing |= other;
    00384
    00385     if ((existing == ROAD_NONE || existing == *pieces) && IsStraightRoad(*pieces)) {
    00386       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    00387     }
    00388     return CMD_ERROR;
    00389   }
    00390
    00391   /* Save the merge of all bits of the current type */
    00392   RoadBits type_bits = existing | *pieces;
    00393
    00394   /* Roads on slopes */
    00395   if (_settings_game.construction.build_on_slopes && (_invalid_tileh_slopes_road[0][tileh] & (other | type_bits)) == ROAD_NONE) {
    00396
    00397     /* If we add leveling we've got to pay for it */
    00398     if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    00399
    00400     return CommandCost();
    00401   }
    00402
    00403   /* Autocomplete uphill roads */
    00404   *pieces |= MirrorRoadBits(*pieces);
    00405   type_bits = existing | *pieces;
    00406
    00407   /* Uphill roads */
    00408   if (IsStraightRoad(type_bits) && (other == type_bits || other == ROAD_NONE) &&
    00409       (_invalid_tileh_slopes_road[1][tileh] & (other | type_bits)) == ROAD_NONE) {
    00410
    00411     /* Slopes with foundation ? */
    00412     if (IsSlopeWithOneCornerRaised(tileh)) {
    00413
    00414       /* Prevent build on slopes if it isn't allowed */
    00415       if (_settings_game.construction.build_on_slopes) {
    00416
    00417         /* If we add foundation we've got to pay for it */
    00418         if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    00419
    00420         return CommandCost();
    00421       }
    00422     } else {
    00423       if (CountBits(existing) == 1) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    00424       return CommandCost();
    00425     }
    00426   }
    00427   return CMD_ERROR;
    00428 }
    00429
    00440 CommandCost CmdBuildRoad(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00441 {
    00442   CommandCost cost(EXPENSES_CONSTRUCTION);
    00443
    00444   RoadBits existing = ROAD_NONE;
    00445   RoadBits other_bits = ROAD_NONE;
    00446
    00447   /* Road pieces are max 4 bitset values (NE, NW, SE, SW) and town can only be non-zero
    00448    * if a non-company is building the road */
    00449   if ((Company::IsValidID(_current_company) && p2 != 0) || (_current_company == OWNER_TOWN && !Town::IsValidID(p2))) return CMD_ERROR;
    00450   if (_current_company != OWNER_TOWN) {
    00451     const Town *town = CalcClosestTownFromTile(tile);
    00452     p2 = (town != NULL) ? town->index : (TownID)INVALID_TOWN;
    00453   }
    00454
    00455   RoadBits pieces = Extract<RoadBits, 0>(p1);
    00456
    00457   /* do not allow building 'zero' road bits, code wouldn't handle it */
    00458   if (pieces == ROAD_NONE) return CMD_ERROR;
    00459
    00460   RoadType rt = (RoadType)GB(p1, 4, 2);
    00461   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
    00462
    00463   DisallowedRoadDirections toggle_drd = (DisallowedRoadDirections)GB(p1, 6, 2);
    00464
    00465   Slope tileh = GetTileSlope(tile, NULL);
    00466
    00467   bool tile_cleared = false; // Used to remember that the tile was cleared during test run
    00468   switch (GetTileType(tile)) {
    00469     case MP_ROAD:
    00470       switch (GetRoadTileType(tile)) {
    00471         case ROAD_TILE_NORMAL: {
    00472           if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
    00473
    00474           other_bits = GetOtherRoadBits(tile, rt);
    00475           if (!HasTileRoadType(tile, rt)) break;
    00476
    00477           existing = GetRoadBits(tile, rt);
    00478           bool crossing = !IsStraightRoad(existing | pieces);
    00479           if (rt != ROADTYPE_TRAM && (GetDisallowedRoadDirections(tile) != DRD_NONE || toggle_drd != DRD_NONE) && crossing) {
    00480             /* Junctions cannot be one-way */
    00481             return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
    00482           }
    00483           if ((existing & pieces) == pieces) {
    00484             /* We only want to set the (dis)allowed road directions */
    00485             if (toggle_drd != DRD_NONE && rt != ROADTYPE_TRAM) {
    00486               if (crossing) return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
    00487
    00488               Owner owner = GetRoadOwner(tile, ROADTYPE_ROAD);
    00489               if (owner != OWNER_NONE && !CheckOwnership(owner, tile)) return CMD_ERROR;
    00490
    00491               if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00492
    00493               /* Ignore half built tiles */
    00494               if ((flags & DC_EXEC) && rt != ROADTYPE_TRAM && IsStraightRoad(existing)) {
    00495                 SetDisallowedRoadDirections(tile, GetDisallowedRoadDirections(tile) ^ toggle_drd);
    00496                 MarkTileDirtyByTile(tile);
    00497               }
    00498               return CommandCost();
    00499             }
    00500             return_cmd_error(STR_ERROR_ALREADY_BUILT);
    00501           }
    00502         } break;
    00503
    00504         case ROAD_TILE_CROSSING:
    00505           other_bits = GetCrossingRoadBits(tile);
    00506           if (pieces & ComplementRoadBits(other_bits)) goto do_clear;
    00507           pieces = other_bits; // we need to pay for both roadbits
    00508
    00509           if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
    00510           break;
    00511
    00512         case ROAD_TILE_DEPOT:
    00513           if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
    00514           goto do_clear;
    00515
    00516         default: NOT_REACHED();
    00517       }
    00518       break;
    00519
    00520     case MP_RAILWAY: {
    00521       if (IsSteepSlope(tileh)) {
    00522         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
    00523       }
    00524
    00525       /* Level crossings may only be built on these slopes */
    00526       if (!HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh)) {
    00527         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
    00528       }
    00529
    00530       if (GetRailTileType(tile) != RAIL_TILE_NORMAL) goto do_clear;
    00531
    00532       Axis roaddir;
    00533       switch (GetTrackBits(tile)) {
    00534         case TRACK_BIT_X:
    00535           if (pieces & ROAD_X) goto do_clear;
    00536           roaddir = AXIS_Y;
    00537           break;
    00538
    00539         case TRACK_BIT_Y:
    00540           if (pieces & ROAD_Y) goto do_clear;
    00541           roaddir = AXIS_X;
    00542           break;
    00543
    00544         default: goto do_clear;
    00545       }
    00546
    00547       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00548
    00549       if (flags & DC_EXEC) {
    00550         Track railtrack = AxisToTrack(OtherAxis(roaddir));
    00551         YapfNotifyTrackLayoutChange(tile, railtrack);
    00552         /* Always add road to the roadtypes (can't draw without it) */
    00553         bool reserved = HasBit(GetRailReservationTrackBits(tile), railtrack);
    00554         MakeRoadCrossing(tile, _current_company, _current_company, GetTileOwner(tile), roaddir, GetRailType(tile), RoadTypeToRoadTypes(rt) | ROADTYPES_ROAD, p2);
    00555         SetCrossingReservation(tile, reserved);
    00556         UpdateLevelCrossing(tile, false);
    00557         MarkTileDirtyByTile(tile);
    00558       }
    00559       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_ROAD] * (rt == ROADTYPE_ROAD ? 2 : 4));
    00560     }
    00561
    00562     case MP_STATION: {
    00563       if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
    00564       if (!IsDriveThroughStopTile(tile)) goto do_clear;
    00565
    00566       RoadBits curbits = AxisToRoadBits(DiagDirToAxis(GetRoadStopDir(tile)));
    00567       if (pieces & ~curbits) goto do_clear;
    00568       pieces = curbits; // we need to pay for both roadbits
    00569
    00570       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
    00571     } break;
    00572
    00573     case MP_TUNNELBRIDGE:
    00574       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) goto do_clear;
    00575       if (MirrorRoadBits(DiagDirToRoadBits(GetTunnelBridgeDirection(tile))) != pieces) goto do_clear;
    00576       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
    00577       /* Don't allow adding roadtype to the bridge/tunnel when vehicles are already driving on it */
    00578       if (HasVehicleOnTunnelBridge(tile, GetOtherTunnelBridgeEnd(tile))) return CMD_ERROR;
    00579       break;
    00580
    00581     default: {
    00582 do_clear:;
    00583       CommandCost ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00584       if (ret.Failed()) return ret;
    00585       cost.AddCost(ret);
    00586       tile_cleared = true;
    00587     } break;
    00588   }
    00589
    00590   if (other_bits != pieces) {
    00591     /* Check the foundation/slopes when adding road/tram bits */
    00592     CommandCost ret = CheckRoadSlope(tileh, &pieces, existing, other_bits);
    00593     /* Return an error if we need to build a foundation (ret != 0) but the
    00594      * current setting is turned off */
    00595     if (ret.Failed() || (ret.GetCost() != 0 && !_settings_game.construction.build_on_slopes)) {
    00596       return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
    00597     }
    00598     cost.AddCost(ret);
    00599   }
    00600
    00601   if (!tile_cleared && IsTileType(tile, MP_ROAD)) {
    00602     /* Don't put the pieces that already exist */
    00603     pieces &= ComplementRoadBits(existing);
    00604
    00605     /* Check if new road bits will have the same foundation as other existing road types */
    00606     if (IsNormalRoad(tile)) {
    00607       Slope slope = GetTileSlope(tile, NULL);
    00608       Foundation found_new = GetRoadFoundation(slope, pieces | existing);
    00609
    00610       /* Test if all other roadtypes can be built at that foundation */
    00611       for (RoadType rtest = ROADTYPE_ROAD; rtest < ROADTYPE_END; rtest++) {
    00612         if (rtest != rt) { // check only other road types
    00613           RoadBits bits = GetRoadBits(tile, rtest);
    00614           /* do not check if there are not road bits of given type */
    00615           if (bits != ROAD_NONE && GetRoadFoundation(slope, bits) != found_new) {
    00616             return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
    00617           }
    00618         }
    00619       }
    00620     }
    00621   }
    00622
    00623   if (!tile_cleared && !EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00624
    00625   cost.AddCost(CountBits(pieces) * _price[PR_BUILD_ROAD]);
    00626   if (!tile_cleared && IsTileType(tile, MP_TUNNELBRIDGE)) {
    00627     /* Pay for *every* tile of the bridge or tunnel */
    00628     cost.MultiplyCost(GetTunnelBridgeLength(GetOtherTunnelBridgeEnd(tile), tile) + 2);
    00629   }
    00630
    00631   if (flags & DC_EXEC) {
    00632     switch (GetTileType(tile)) {
    00633       case MP_ROAD: {
    00634         RoadTileType rtt = GetRoadTileType(tile);
    00635         if (existing == ROAD_NONE || rtt == ROAD_TILE_CROSSING) {
    00636           SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
    00637           SetRoadOwner(tile, rt, _current_company);
    00638           if (rt == ROADTYPE_ROAD) SetTownIndex(tile, p2);
    00639         }
    00640         if (rtt != ROAD_TILE_CROSSING) SetRoadBits(tile, existing | pieces, rt);
    00641       } break;
    00642
    00643       case MP_TUNNELBRIDGE: {
    00644         TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
    00645
    00646         SetRoadTypes(other_end, GetRoadTypes(other_end) | RoadTypeToRoadTypes(rt));
    00647         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
    00648         SetRoadOwner(other_end, rt, _current_company);
    00649         SetRoadOwner(tile, rt, _current_company);
    00650
    00651         /* Mark tiles diry that have been repaved */
    00652         MarkTileDirtyByTile(other_end);
    00653         MarkTileDirtyByTile(tile);
    00654         if (IsBridge(tile)) {
    00655           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
    00656
    00657           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
    00658         }
    00659       } break;
    00660
    00661       case MP_STATION:
    00662         assert(IsDriveThroughStopTile(tile));
    00663         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
    00664         SetRoadOwner(tile, rt, _current_company);
    00665         break;
    00666
    00667       default:
    00668         MakeRoadNormal(tile, pieces, RoadTypeToRoadTypes(rt), p2, _current_company, _current_company);
    00669         break;
    00670     }
    00671
    00672     if (rt != ROADTYPE_TRAM && IsNormalRoadTile(tile)) {
    00673       existing |= pieces;
    00674       SetDisallowedRoadDirections(tile, IsStraightRoad(existing) ?
    00675           GetDisallowedRoadDirections(tile) ^ toggle_drd : DRD_NONE);
    00676     }
    00677
    00678     MarkTileDirtyByTile(tile);
    00679   }
    00680   return cost;
    00681 }
    00682
    00697 CommandCost CmdBuildLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00698 {
    00699   CommandCost cost(EXPENSES_CONSTRUCTION);
    00700   bool had_bridge = false;
    00701   bool had_tunnel = false;
    00702   bool had_success = false;
    00703   DisallowedRoadDirections drd = DRD_NORTHBOUND;
    00704
    00705   _error_message = INVALID_STRING_ID;
    00706
    00707   if (p1 >= MapSize()) return CMD_ERROR;
    00708
    00709   TileIndex end_tile = p1;
    00710   RoadType rt = (RoadType)GB(p2, 3, 2);
    00711   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
    00712
    00713   Axis axis = Extract<Axis, 2>(p2);
    00714   /* Only drag in X or Y direction dictated by the direction variable */
    00715   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
    00716   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
    00717
    00718   DiagDirection dir = AxisToDiagDir(axis);
    00719
    00720   /* Swap direction, also the half-tile drag var (bit 0 and 1) */
    00721   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
    00722     dir = ReverseDiagDir(dir);
    00723     p2 ^= 3;
    00724     drd = DRD_SOUTHBOUND;
    00725   }
    00726
    00727   /* On the X-axis, we have to swap the initial bits, so they
    00728    * will be interpreted correctly in the GTTS. Futhermore
    00729    * when you just 'click' on one tile to build them. */
    00730   if ((axis == AXIS_Y) == (start_tile == end_tile && HasBit(p2, 0) == HasBit(p2, 1))) drd ^= DRD_BOTH;
    00731   /* No disallowed direction bits have to be toggled */
    00732   if (!HasBit(p2, 5)) drd = DRD_NONE;
    00733
    00734   TileIndex tile = start_tile;
    00735   /* Start tile is the first tile clicked by the user. */
    00736   for (;;) {
    00737     RoadBits bits = AxisToRoadBits(axis);
    00738
    00739     /* Road parts only have to be built at the start tile or at the end tile. */
    00740     if (tile == end_tile && !HasBit(p2, 1)) bits &= DiagDirToRoadBits(ReverseDiagDir(dir));
    00741     if (tile == start_tile && HasBit(p2, 0)) bits &= DiagDirToRoadBits(dir);
    00742
    00743     _error_message = INVALID_STRING_ID;
    00744     CommandCost ret = DoCommand(tile, drd << 6 | rt << 4 | bits, 0, flags, CMD_BUILD_ROAD);
    00745     if (ret.Failed()) {
    00746       if (_error_message != STR_ERROR_ALREADY_BUILT) {
    00747         if (HasBit(p2, 6)) return CMD_ERROR;
    00748         break;
    00749       }
    00750     } else {
    00751       had_success = true;
    00752       /* Only pay for the upgrade on one side of the bridges and tunnels */
    00753       if (IsTileType(tile, MP_TUNNELBRIDGE)) {
    00754         if (IsBridge(tile)) {
    00755           if ((!had_bridge || GetTunnelBridgeDirection(tile) == dir)) {
    00756             cost.AddCost(ret);
    00757           }
    00758           had_bridge = true;
    00759         } else { // IsTunnel(tile)
    00760           if ((!had_tunnel || GetTunnelBridgeDirection(tile) == dir)) {
    00761             cost.AddCost(ret);
    00762           }
    00763           had_tunnel = true;
    00764         }
    00765       } else {
    00766         cost.AddCost(ret);
    00767       }
    00768     }
    00769
    00770     if (tile == end_tile) break;
    00771
    00772     tile += TileOffsByDiagDir(dir);
    00773   }
    00774
    00775   return !had_success ? CMD_ERROR : cost;
    00776 }
    00777
    00790 CommandCost CmdRemoveLongRoad(TileIndex end_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00791 {
    00792   CommandCost cost(EXPENSES_CONSTRUCTION);
    00793
    00794   if (p1 >= MapSize()) return CMD_ERROR;
    00795
    00796   TileIndex start_tile = p1;
    00797   RoadType rt = (RoadType)GB(p2, 3, 2);
    00798   if (!IsValidRoadType(rt)) return CMD_ERROR;
    00799
    00800   Axis axis = Extract<Axis, 2>(p2);
    00801   /* Only drag in X or Y direction dictated by the direction variable */
    00802   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
    00803   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
    00804
    00805   /* Swap start and ending tile, also the half-tile drag var (bit 0 and 1) */
    00806   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
    00807     TileIndex t = start_tile;
    00808     start_tile = end_tile;
    00809     end_tile = t;
    00810     p2 ^= IsInsideMM(p2 & 3, 1, 3) ? 3 : 0;
    00811   }
    00812
    00813   Money money = GetAvailableMoneyForCommand();
    00814   TileIndex tile = start_tile;
    00815   /* Start tile is the small number. */
    00816   for (;;) {
    00817     RoadBits bits = AxisToRoadBits(axis);
    00818
    00819     if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
    00820     if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
    00821
    00822     /* try to remove the halves. */
    00823     if (bits != 0) {
    00824       CommandCost ret = RemoveRoad(tile, flags & ~DC_EXEC, bits, rt, true);
    00825       if (ret.Succeeded()) {
    00826         if (flags & DC_EXEC) {
    00827           money -= ret.GetCost();
    00828           if (money < 0) {
    00829             _additional_cash_required = DoCommand(end_tile, start_tile, p2, flags & ~DC_EXEC, CMD_REMOVE_LONG_ROAD).GetCost();
    00830             return cost;
    00831           }
    00832           RemoveRoad(tile, flags, bits, rt, true, false);
    00833         }
    00834         cost.AddCost(ret);
    00835       }
    00836     }
    00837
    00838     if (tile == end_tile) break;
    00839
    00840     tile += (axis == AXIS_Y) ? TileDiffXY(0, 1) : TileDiffXY(1, 0);
    00841   }
    00842
    00843   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
    00844 }
    00845
    00858 CommandCost CmdBuildRoadDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00859 {
    00860   DiagDirection dir = Extract<DiagDirection, 0>(p1);
    00861   RoadType rt = (RoadType)GB(p1, 2, 2);
    00862
    00863   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
    00864
    00865   Slope tileh = GetTileSlope(tile, NULL);
    00866   if (tileh != SLOPE_FLAT && (
    00867         !_settings_game.construction.build_on_slopes ||
    00868         IsSteepSlope(tileh) ||
    00869         !CanBuildDepotByTileh(dir, tileh)
    00870       )) {
    00871     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
    00872   }
    00873
    00874   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00875   if (cost.Failed()) return CMD_ERROR;
    00876
    00877   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
    00878
    00879   if (!Depot::CanAllocateItem()) return CMD_ERROR;
    00880
    00881   if (flags & DC_EXEC) {
    00882     Depot *dep = new Depot(tile);
    00883     dep->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
    00884
    00885     MakeRoadDepot(tile, _current_company, dep->index, dir, rt);
    00886     MarkTileDirtyByTile(tile);
    00887   }
    00888   return cost.AddCost(_price[PR_BUILD_DEPOT_ROAD]);
    00889 }
    00890
    00891 static CommandCost RemoveRoadDepot(TileIndex tile, DoCommandFlag flags)
    00892 {
    00893   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER) return CMD_ERROR;
    00894
    00895   if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00896
    00897   if (flags & DC_EXEC) {
    00898     delete Depot::GetByTile(tile);
    00899     DoClearSquare(tile);
    00900   }
    00901
    00902   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_ROAD]);
    00903 }
    00904
    00905 static CommandCost ClearTile_Road(TileIndex tile, DoCommandFlag flags)
    00906 {
    00907   switch (GetRoadTileType(tile)) {
    00908     case ROAD_TILE_NORMAL: {
    00909       RoadBits b = GetAllRoadBits(tile);
    00910
    00911       /* Clear the road if only one piece is on the tile OR we are not using the DC_AUTO flag */
    00912       if ((CountBits(b) == 1 && GetRoadBits(tile, ROADTYPE_TRAM) == ROAD_NONE) || !(flags & DC_AUTO)) {
    00913         RoadTypes rts = GetRoadTypes(tile);
    00914         CommandCost ret(EXPENSES_CONSTRUCTION);
    00915         for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
    00916           if (HasBit(rts, rt)) {
    00917             CommandCost tmp_ret = RemoveRoad(tile, flags, GetRoadBits(tile, rt), rt, true);
    00918             if (tmp_ret.Failed()) return tmp_ret;
    00919             ret.AddCost(tmp_ret);
    00920           }
    00921         }
    00922         return ret;
    00923       }
    00924       return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
    00925     }
    00926
    00927     case ROAD_TILE_CROSSING: {
    00928       RoadTypes rts = GetRoadTypes(tile);
    00929       CommandCost ret(EXPENSES_CONSTRUCTION);
    00930
    00931       if (flags & DC_AUTO) return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
    00932
    00933       /* Must iterate over the roadtypes in a reverse manner because
    00934        * tram tracks must be removed before the road bits. */
    00935       RoadType rt = ROADTYPE_TRAM;
    00936       do {
    00937         if (HasBit(rts, rt)) {
    00938           CommandCost tmp_ret = RemoveRoad(tile, flags, GetCrossingRoadBits(tile), rt, false);
    00939           if (tmp_ret.Failed()) return tmp_ret;
    00940           ret.AddCost(tmp_ret);
    00941         }
    00942       } while (rt-- != ROADTYPE_ROAD);
    00943
    00944       if (flags & DC_EXEC) {
    00945         DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00946       }
    00947       return ret;
    00948     }
    00949
    00950     default:
    00951     case ROAD_TILE_DEPOT:
    00952       if (flags & DC_AUTO) {
    00953         return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
    00954       }
    00955       return RemoveRoadDepot(tile, flags);
    00956   }
    00957 }
    00958
    00959
    00960 struct DrawRoadTileStruct {
    00961   uint16 image;
    00962   byte subcoord_x;
    00963   byte subcoord_y;
    00964 };
    00965
    00966 #include "table/road_land.h"
    00967
    00975 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits)
    00976 {
    00977   /* Flat land and land without a road doesn't require a foundation */
    00978   if (tileh == SLOPE_FLAT || bits == ROAD_NONE) return FOUNDATION_NONE;
    00979
    00980   if (!IsSteepSlope(tileh)) {
    00981     /* Leveled RoadBits on a slope */
    00982     if ((_invalid_tileh_slopes_road[0][tileh] & bits) == ROAD_NONE) return FOUNDATION_LEVELED;
    00983
    00984     /* Straight roads without foundation on a slope */
    00985     if (!IsSlopeWithOneCornerRaised(tileh) &&
    00986         (_invalid_tileh_slopes_road[1][tileh] & bits) == ROAD_NONE)
    00987       return FOUNDATION_NONE;
    00988   }
    00989
    00990   /* Roads on steep Slopes or on Slopes with one corner raised */
    00991   return (bits == ROAD_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
    00992 }
    00993
    00994 const byte _road_sloped_sprites[14] = {
    00995   0,  0,  2,  0,
    00996   0,  1,  0,  0,
    00997   3,  0,  0,  0,
    00998   0,  0
    00999 };
    01000
    01011 static bool AlwaysDrawUnpavedRoads(TileIndex tile, Roadside roadside)
    01012 {
    01013   return (IsOnSnow(tile) &&
    01014       !(_settings_game.game_creation.landscape == LT_TROPIC && HasGrfMiscBit(GMB_DESERT_PAVED_ROADS) &&
    01015         roadside != ROADSIDE_BARREN && roadside != ROADSIDE_GRASS && roadside != ROADSIDE_GRASS_ROAD_WORKS));
    01016 }
    01017
    01023 void DrawTramCatenary(const TileInfo *ti, RoadBits tram)
    01024 {
    01025   /* Do not draw catenary if it is invisible */
    01026   if (IsInvisibilitySet(TO_CATENARY)) return;
    01027
    01028   /* Don't draw the catenary under a low bridge */
    01029   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_CATENARY)) {
    01030     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
    01031
    01032     if (height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) return;
    01033   }
    01034
    01035   SpriteID front;
    01036   SpriteID back;
    01037
    01038   if (ti->tileh != SLOPE_FLAT) {
    01039     back  = SPR_TRAMWAY_BACK_WIRES_SLOPED  + _road_sloped_sprites[ti->tileh - 1];
    01040     front = SPR_TRAMWAY_FRONT_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
    01041   } else {
    01042     back  = SPR_TRAMWAY_BASE + _road_backpole_sprites_1[tram];
    01043     front = SPR_TRAMWAY_BASE + _road_frontwire_sprites_1[tram];
    01044   }
    01045
    01046   AddSortableSpriteToDraw(back,  PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
    01047   AddSortableSpriteToDraw(front, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
    01048 }
    01049
    01058 static void DrawRoadDetail(SpriteID img, const TileInfo *ti, int dx, int dy, int h)
    01059 {
    01060   int x = ti->x | dx;
    01061   int y = ti->y | dy;
    01062   byte z = ti->z;
    01063   if (ti->tileh != SLOPE_FLAT) z = GetSlopeZ(x, y);
    01064   AddSortableSpriteToDraw(img, PAL_NONE, x, y, 2, 2, h, z);
    01065 }
    01066
    01071 static void DrawRoadBits(TileInfo *ti)
    01072 {
    01073   RoadBits road = GetRoadBits(ti->tile, ROADTYPE_ROAD);
    01074   RoadBits tram = GetRoadBits(ti->tile, ROADTYPE_TRAM);
    01075
    01076   SpriteID image = 0;
    01077   PaletteID pal = PAL_NONE;
    01078
    01079   if (ti->tileh != SLOPE_FLAT) {
    01080     DrawFoundation(ti, GetRoadFoundation(ti->tileh, road | tram));
    01081
    01082     /* DrawFoundation() modifies ti.
    01083      * Default sloped sprites.. */
    01084     if (ti->tileh != SLOPE_FLAT) image = _road_sloped_sprites[ti->tileh - 1] + 0x53F;
    01085   }
    01086
    01087   if (image == 0) image = _road_tile_sprites_1[road != ROAD_NONE ? road : tram];
    01088
    01089   Roadside roadside = GetRoadside(ti->tile);
    01090
    01091   if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
    01092     image += 19;
    01093   } else {
    01094     switch (roadside) {
    01095       case ROADSIDE_BARREN:           pal = PALETTE_TO_BARE_LAND; break;
    01096       case ROADSIDE_GRASS:            break;
    01097       case ROADSIDE_GRASS_ROAD_WORKS: break;
    01098       default:                        image -= 19; break; // Paved
    01099     }
    01100   }
    01101
    01102   DrawGroundSprite(image, pal);
    01103
    01104   /* For tram we overlay the road graphics with either tram tracks only
    01105    * (when there is actual road beneath the trams) or with tram tracks
    01106    * and some dirts which hides the road graphics */
    01107   if (tram != ROAD_NONE) {
    01108     if (ti->tileh != SLOPE_FLAT) {
    01109       image = _road_sloped_sprites[ti->tileh - 1] + SPR_TRAMWAY_SLOPED_OFFSET;
    01110     } else {
    01111       image = _road_tile_sprites_1[tram] - SPR_ROAD_Y;
    01112     }
    01113     image += (road == ROAD_NONE) ? SPR_TRAMWAY_TRAM : SPR_TRAMWAY_OVERLAY;
    01114     DrawGroundSprite(image, pal);
    01115   }
    01116
    01117   if (road != ROAD_NONE) {
    01118     DisallowedRoadDirections drd = GetDisallowedRoadDirections(ti->tile);
    01119     if (drd != DRD_NONE) {
    01120       DrawGroundSpriteAt(SPR_ONEWAY_BASE + drd - 1 + ((road == ROAD_X) ? 0 : 3), PAL_NONE, 8, 8, GetPartialZ(8, 8, ti->tileh));
    01121     }
    01122   }
    01123
    01124   if (HasRoadWorks(ti->tile)) {
    01125     /* Road works */
    01126     DrawGroundSprite((road | tram) & ROAD_X ? SPR_EXCAVATION_X : SPR_EXCAVATION_Y, PAL_NONE);
    01127     return;
    01128   }
    01129
    01130   if (tram != ROAD_NONE) DrawTramCatenary(ti, tram);
    01131
    01132   /* Return if full detail is disabled, or we are zoomed fully out. */
    01133   if (!HasBit(_display_opt, DO_FULL_DETAIL) || _cur_dpi->zoom > ZOOM_LVL_DETAIL) return;
    01134
    01135   /* Do not draw details (street lights, trees) under low bridge */
    01136   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && (roadside == ROADSIDE_TREES || roadside == ROADSIDE_STREET_LIGHTS)) {
    01137     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
    01138     uint minz = GetTileMaxZ(ti->tile) + 2 * TILE_HEIGHT;
    01139
    01140     if (roadside == ROADSIDE_TREES) minz += TILE_HEIGHT;
    01141
    01142     if (height < minz) return;
    01143   }
    01144
    01145   /* If there are no road bits, return, as there is nothing left to do */
    01146   if (CountBits(road) < 2) return;
    01147
    01148   /* Draw extra details. */
    01149   for (const DrawRoadTileStruct *drts = _road_display_table[roadside][road | tram]; drts->image != 0; drts++) {
    01150     DrawRoadDetail(drts->image, ti, drts->subcoord_x, drts->subcoord_y, 0x10);
    01151   }
    01152 }
    01153
    01155 static void DrawTile_Road(TileInfo *ti)
    01156 {
    01157   switch (GetRoadTileType(ti->tile)) {
    01158     case ROAD_TILE_NORMAL:
    01159       DrawRoadBits(ti);
    01160       break;
    01161
    01162     case ROAD_TILE_CROSSING: {
    01163       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
    01164
    01165       SpriteID image = GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.crossing;
    01166       PaletteID pal = PAL_NONE;
    01167
    01168       if (GetCrossingRoadAxis(ti->tile) == AXIS_X) image++;
    01169       if (IsCrossingBarred(ti->tile)) image += 2;
    01170
    01171       Roadside roadside = GetRoadside(ti->tile);
    01172
    01173       if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
    01174         image += 8;
    01175       } else {
    01176         switch (roadside) {
    01177           case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
    01178           case ROADSIDE_GRASS:  break;
    01179           default:              image += 4; break; // Paved
    01180         }
    01181       }
    01182
    01183       DrawGroundSprite(image, pal);
    01184
    01185       /* PBS debugging, draw reserved tracks darker */
    01186       if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) {
    01187         DrawGroundSprite(GetCrossingRoadAxis(ti->tile) == AXIS_Y ? GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_x : GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_y, PALETTE_CRASH);
    01188       }
    01189
    01190       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
    01191         DrawGroundSprite(SPR_TRAMWAY_OVERLAY + (GetCrossingRoadAxis(ti->tile) ^ 1), pal);
    01192         DrawTramCatenary(ti, GetCrossingRoadBits(ti->tile));
    01193       }
    01194       if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    01195       break;
    01196     }
    01197
    01198     default:
    01199     case ROAD_TILE_DEPOT: {
    01200       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
    01201
    01202       PaletteID palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
    01203
    01204       const DrawTileSprites *dts;
    01205       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
    01206         dts =  &_tram_depot[GetRoadDepotDirection(ti->tile)];
    01207       } else {
    01208         dts =  &_road_depot[GetRoadDepotDirection(ti->tile)];
    01209       }
    01210
    01211       DrawGroundSprite(dts->ground.sprite, PAL_NONE);
    01212       DrawOrigTileSeq(ti, dts, TO_BUILDINGS, palette);
    01213       break;
    01214     }
    01215   }
    01216   DrawBridgeMiddle(ti);
    01217 }
    01218
    01219 void DrawRoadDepotSprite(int x, int y, DiagDirection dir, RoadType rt)
    01220 {
    01221   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
    01222   const DrawTileSprites *dts = (rt == ROADTYPE_TRAM) ? &_tram_depot[dir] : &_road_depot[dir];
    01223
    01224   x += 33;
    01225   y += 17;
    01226
    01227   DrawSprite(dts->ground.sprite, PAL_NONE, x, y);
    01228   DrawOrigTileSeqInGUI(x, y, dts, palette);
    01229 }
    01230
    01236 void UpdateNearestTownForRoadTiles(bool invalidate)
    01237 {
    01238   assert(!invalidate || _generating_world);
    01239
    01240   for (TileIndex t = 0; t < MapSize(); t++) {
    01241     if (IsTileType(t, MP_ROAD) && !IsRoadDepot(t) && !HasTownOwnedRoad(t)) {
    01242       TownID tid = (TownID)INVALID_TOWN;
    01243       if (!invalidate) {
    01244         const Town *town = CalcClosestTownFromTile(t);
    01245         if (town != NULL) tid = town->index;
    01246       }
    01247       SetTownIndex(t, tid);
    01248     }
    01249   }
    01250 }
    01251
    01252 static uint GetSlopeZ_Road(TileIndex tile, uint x, uint y)
    01253 {
    01254   uint z;
    01255   Slope tileh = GetTileSlope(tile, &z);
    01256
    01257   if (tileh == SLOPE_FLAT) return z;
    01258   if (IsNormalRoad(tile)) {
    01259     Foundation f = GetRoadFoundation(tileh, GetAllRoadBits(tile));
    01260     z += ApplyFoundationToSlope(f, &tileh);
    01261     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
    01262   } else {
    01263     return z + TILE_HEIGHT;
    01264   }
    01265 }
    01266
    01267 static Foundation GetFoundation_Road(TileIndex tile, Slope tileh)
    01268 {
    01269   if (IsNormalRoad(tile)) {
    01270     return GetRoadFoundation(tileh, GetAllRoadBits(tile));
    01271   } else {
    01272     return FlatteningFoundation(tileh);
    01273   }
    01274 }
    01275
    01276 static const Roadside _town_road_types[][2] = {
    01277   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
    01278   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
    01279   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
    01280   { ROADSIDE_TREES,         ROADSIDE_TREES },
    01281   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
    01282 };
    01283
    01284 static const Roadside _town_road_types_2[][2] = {
    01285   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
    01286   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
    01287   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
    01288   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
    01289   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
    01290 };
    01291
    01292
    01293 static void TileLoop_Road(TileIndex tile)
    01294 {
    01295   switch (_settings_game.game_creation.landscape) {
    01296     case LT_ARCTIC:
    01297       if (IsOnSnow(tile) != (GetTileZ(tile) > GetSnowLine())) {
    01298         ToggleSnow(tile);
    01299         MarkTileDirtyByTile(tile);
    01300       }
    01301       break;
    01302
    01303     case LT_TROPIC:
    01304       if (GetTropicZone(tile) == TROPICZONE_DESERT && !IsOnDesert(tile)) {
    01305         ToggleDesert(tile);
    01306         MarkTileDirtyByTile(tile);
    01307       }
    01308       break;
    01309   }
    01310
    01311   if (IsRoadDepot(tile)) return;
    01312
    01313   const Town *t = ClosestTownFromTile(tile, UINT_MAX);
    01314   if (!HasRoadWorks(tile)) {
    01315     HouseZonesBits grp = HZB_TOWN_EDGE;
    01316
    01317     if (t != NULL) {
    01318       grp = GetTownRadiusGroup(t, tile);
    01319
    01320       /* Show an animation to indicate road work */
    01321       if (t->road_build_months != 0 &&
    01322           (DistanceManhattan(t->xy, tile) < 8 || grp != HZB_TOWN_EDGE) &&
    01323           IsNormalRoad(tile) && CountBits(GetAllRoadBits(tile)) > 1 ) {
    01324         if (GetFoundationSlope(tile, NULL) == SLOPE_FLAT && EnsureNoVehicleOnGround(tile) && Chance16(1, 40)) {
    01325           StartRoadWorks(tile);
    01326
    01327           SndPlayTileFx(SND_21_JACKHAMMER, tile);
    01328           CreateEffectVehicleAbove(
    01329             TileX(tile) * TILE_SIZE + 7,
    01330             TileY(tile) * TILE_SIZE + 7,
    01331             0,
    01332             EV_BULLDOZER);
    01333           MarkTileDirtyByTile(tile);
    01334           return;
    01335         }
    01336       }
    01337     }
    01338
    01339     {
    01340       /* Adjust road ground type depending on 'grp' (grp is the distance to the center) */
    01341       const Roadside *new_rs = (_settings_game.game_creation.landscape == LT_TOYLAND) ? _town_road_types_2[grp] : _town_road_types[grp];
    01342       Roadside cur_rs = GetRoadside(tile);
    01343
    01344       /* We have our desired type, do nothing */
    01345       if (cur_rs == new_rs[0]) return;
    01346
    01347       /* We have the pre-type of the desired type, switch to the desired type */
    01348       if (cur_rs == new_rs[1]) {
    01349         cur_rs = new_rs[0];
    01350       /* We have barren land, install the pre-type */
    01351       } else if (cur_rs == ROADSIDE_BARREN) {
    01352         cur_rs = new_rs[1];
    01353       /* We're totally off limits, remove any installation and make barren land */
    01354       } else {
    01355         cur_rs = ROADSIDE_BARREN;
    01356       }
    01357       SetRoadside(tile, cur_rs);
    01358       MarkTileDirtyByTile(tile);
    01359     }
    01360   } else if (IncreaseRoadWorksCounter(tile)) {
    01361     TerminateRoadWorks(tile);
    01362
    01363     if (_settings_game.economy.mod_road_rebuild) {
    01364       /* Generate a nicer town surface */
    01365       const RoadBits old_rb = GetAnyRoadBits(tile, ROADTYPE_ROAD);
    01366       const RoadBits new_rb = CleanUpRoadBits(tile, old_rb);
    01367
    01368       if (old_rb != new_rb) {
    01369         RemoveRoad(tile, DC_EXEC | DC_AUTO | DC_NO_WATER, (old_rb ^ new_rb), ROADTYPE_ROAD, true);
    01370       }
    01371     }
    01372
    01373     MarkTileDirtyByTile(tile);
    01374   }
    01375 }
    01376
    01377 static bool ClickTile_Road(TileIndex tile)
    01378 {
    01379   if (!IsRoadDepot(tile)) return false;
    01380
    01381   ShowDepotWindow(tile, VEH_ROAD);
    01382   return true;
    01383 }
    01384
    01385 /* Converts RoadBits to TrackBits */
    01386 static const byte _road_trackbits[16] = {
    01387   0x0, 0x0, 0x0, 0x10, 0x0, 0x2, 0x8, 0x1A, 0x0, 0x4, 0x1, 0x15, 0x20, 0x26, 0x29, 0x3F,
    01388 };
    01389
    01390 static TrackStatus GetTileTrackStatus_Road(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
    01391 {
    01392   TrackdirBits trackdirbits = TRACKDIR_BIT_NONE;
    01393   TrackdirBits red_signals = TRACKDIR_BIT_NONE; // crossing barred
    01394   switch (mode) {
    01395     case TRANSPORT_RAIL:
    01396       if (IsLevelCrossing(tile)) trackdirbits = TrackBitsToTrackdirBits(GetCrossingRailBits(tile));
    01397       break;
    01398
    01399     case TRANSPORT_ROAD:
    01400       if ((GetRoadTypes(tile) & sub_mode) == 0) break;
    01401       switch (GetRoadTileType(tile)) {
    01402         case ROAD_TILE_NORMAL: {
    01403           const uint drd_to_multiplier[DRD_END] = { 0x101, 0x100, 0x1, 0x0 };
    01404           RoadType rt = (RoadType)FindFirstBit(sub_mode);
    01405           RoadBits bits = GetRoadBits(tile, rt);
    01406
    01407           /* no roadbit at this side of tile, return 0 */
    01408           if (side != INVALID_DIAGDIR && (DiagDirToRoadBits(side) & bits) == 0) break;
    01409
    01410           uint multiplier = drd_to_multiplier[rt == ROADTYPE_TRAM ? DRD_NONE : GetDisallowedRoadDirections(tile)];
    01411           if (!HasRoadWorks(tile)) trackdirbits = (TrackdirBits)(_road_trackbits[bits] * multiplier);
    01412           break;
    01413         }
    01414
    01415         case ROAD_TILE_CROSSING: {
    01416           Axis axis = GetCrossingRoadAxis(tile);
    01417
    01418           if (side != INVALID_DIAGDIR && axis != DiagDirToAxis(side)) break;
    01419
    01420           trackdirbits = TrackBitsToTrackdirBits(AxisToTrackBits(axis));
    01421           if (IsCrossingBarred(tile)) red_signals = trackdirbits;
    01422           break;
    01423         }
    01424
    01425         default:
    01426         case ROAD_TILE_DEPOT: {
    01427           DiagDirection dir = GetRoadDepotDirection(tile);
    01428
    01429           if (side != INVALID_DIAGDIR && side != dir) break;
    01430
    01431           trackdirbits = TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir));
    01432           break;
    01433         }
    01434       }
    01435       break;
    01436
    01437     default: break;
    01438   }
    01439   return CombineTrackStatus(trackdirbits, red_signals);
    01440 }
    01441
    01442 static const StringID _road_tile_strings[] = {
    01443   STR_LAI_ROAD_DESCRIPTION_ROAD,
    01444   STR_LAI_ROAD_DESCRIPTION_ROAD,
    01445   STR_LAI_ROAD_DESCRIPTION_ROAD,
    01446   STR_LAI_ROAD_DESCRIPTION_ROAD_WITH_STREETLIGHTS,
    01447   STR_LAI_ROAD_DESCRIPTION_ROAD,
    01448   STR_LAI_ROAD_DESCRIPTION_TREE_LINED_ROAD,
    01449   STR_LAI_ROAD_DESCRIPTION_ROAD,
    01450   STR_LAI_ROAD_DESCRIPTION_ROAD,
    01451 };
    01452
    01453 static void GetTileDesc_Road(TileIndex tile, TileDesc *td)
    01454 {
    01455   Owner rail_owner = INVALID_OWNER;
    01456   Owner road_owner = INVALID_OWNER;
    01457   Owner tram_owner = INVALID_OWNER;
    01458
    01459   switch (GetRoadTileType(tile)) {
    01460     case ROAD_TILE_CROSSING: {
    01461       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_RAIL_LEVEL_CROSSING;
    01462       RoadTypes rts = GetRoadTypes(tile);
    01463       rail_owner = GetTileOwner(tile);
    01464       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
    01465       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
    01466       break;
    01467     }
    01468
    01469     case ROAD_TILE_DEPOT:
    01470       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_VEHICLE_DEPOT;
    01471       road_owner = GetTileOwner(tile); // Tile has only one owner, roadtype does not matter
    01472       break;
    01473
    01474     default: {
    01475       RoadTypes rts = GetRoadTypes(tile);
    01476       td->str = (HasBit(rts, ROADTYPE_ROAD) ? _road_tile_strings[GetRoadside(tile)] : STR_LAI_ROAD_DESCRIPTION_TRAMWAY);
    01477       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
    01478       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
    01479       break;
    01480     }
    01481   }
    01482
    01483   /* Now we have to discover, if the tile has only one owner or many:
    01484    *   - Find a first_owner of the tile. (Currently road or tram must be present, but this will break when the third type becomes available)
    01485    *   - Compare the found owner with the other owners, and test if they differ.
    01486    * Note: If road exists it will be the first_owner.
    01487    */
    01488   Owner first_owner = (road_owner == INVALID_OWNER ? tram_owner : road_owner);
    01489   bool mixed_owners = (tram_owner != INVALID_OWNER && tram_owner != first_owner) || (rail_owner != INVALID_OWNER && rail_owner != first_owner);
    01490
    01491   if (mixed_owners) {
    01492     /* Multiple owners */
    01493     td->owner_type[0] = (rail_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_RAIL_OWNER);
    01494     td->owner[0] = rail_owner;
    01495     td->owner_type[1] = (road_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_ROAD_OWNER);
    01496     td->owner[1] = road_owner;
    01497     td->owner_type[2] = (tram_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_TRAM_OWNER);
    01498     td->owner[2] = tram_owner;
    01499   } else {
    01500     /* One to rule them all */
    01501     td->owner[0] = first_owner;
    01502   }
    01503 }
    01504
    01509 static const byte _roadveh_enter_depot_dir[4] = {
    01510   TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE
    01511 };
    01512
    01513 static VehicleEnterTileStatus VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
    01514 {
    01515   switch (GetRoadTileType(tile)) {
    01516     case ROAD_TILE_DEPOT: {
    01517       if (v->type != VEH_ROAD) break;
    01518
    01519       RoadVehicle *rv = RoadVehicle::From(v);
    01520       if (rv->frame == RVC_DEPOT_STOP_FRAME &&
    01521           _roadveh_enter_depot_dir[GetRoadDepotDirection(tile)] == rv->state) {
    01522         rv->state = RVSB_IN_DEPOT;
    01523         rv->vehstatus |= VS_HIDDEN;
    01524         rv->direction = ReverseDir(rv->direction);
    01525         if (rv->Next() == NULL) VehicleEnterDepot(rv->First());
    01526         rv->tile = tile;
    01527
    01528         InvalidateWindowData(WC_VEHICLE_DEPOT, rv->tile);
    01529         return VETSB_ENTERED_WORMHOLE;
    01530       }
    01531     } break;
    01532
    01533     default: break;
    01534   }
    01535   return VETSB_CONTINUE;
    01536 }
    01537
    01538
    01539 static void ChangeTileOwner_Road(TileIndex tile, Owner old_owner, Owner new_owner)
    01540 {
    01541   if (IsRoadDepot(tile)) {
    01542     if (GetTileOwner(tile) == old_owner) {
    01543       if (new_owner == INVALID_OWNER) {
    01544         DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
    01545       } else {
    01546         SetTileOwner(tile, new_owner);
    01547       }
    01548     }
    01549     return;
    01550   }
    01551
    01552   for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
    01553     /* Update all roadtypes, no matter if they are present */
    01554     if (GetRoadOwner(tile, rt) == old_owner) {
    01555       SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
    01556     }
    01557   }
    01558
    01559   if (IsLevelCrossing(tile)) {
    01560     if (GetTileOwner(tile) == old_owner) {
    01561       if (new_owner == INVALID_OWNER) {
    01562         DoCommand(tile, 0, GetCrossingRailTrack(tile), DC_EXEC | DC_BANKRUPT, CMD_REMOVE_SINGLE_RAIL);
    01563       } else {
    01564         SetTileOwner(tile, new_owner);
    01565       }
    01566     }
    01567   }
    01568 }
    01569
    01570 static CommandCost TerraformTile_Road(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
    01571 {
    01572   if (_settings_game.construction.build_on_slopes && AutoslopeEnabled()) {
    01573     switch (GetRoadTileType(tile)) {
    01574       case ROAD_TILE_CROSSING:
    01575         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]);
    01576         break;
    01577
    01578       case ROAD_TILE_DEPOT:
    01579         if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRoadDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    01580         break;
    01581
    01582       case ROAD_TILE_NORMAL: {
    01583         RoadBits bits = GetAllRoadBits(tile);
    01584         RoadBits bits_copy = bits;
    01585         /* Check if the slope-road_bits combination is valid at all, i.e. it is safe to call GetRoadFoundation(). */
    01586         if (CheckRoadSlope(tileh_new, &bits_copy, ROAD_NONE, ROAD_NONE).Succeeded()) {
    01587           /* CheckRoadSlope() sometimes changes the road_bits, if it does not agree with them. */
    01588           if (bits == bits_copy) {
    01589             uint z_old;
    01590             Slope tileh_old = GetTileSlope(tile, &z_old);
    01591
    01592             /* Get the slope on top of the foundation */
    01593             z_old += ApplyFoundationToSlope(GetRoadFoundation(tileh_old, bits), &tileh_old);
    01594             z_new += ApplyFoundationToSlope(GetRoadFoundation(tileh_new, bits), &tileh_new);
    01595
    01596             /* The surface slope must not be changed */
    01597             if ((z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    01598           }
    01599         }
    01600         break;
    01601       }
    01602
    01603       default: NOT_REACHED();
    01604     }
    01605   }
    01606
    01607   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    01608 }
    01609
    01611 extern const TileTypeProcs _tile_type_road_procs = {
    01612   DrawTile_Road,           // draw_tile_proc
    01613   GetSlopeZ_Road,          // get_slope_z_proc
    01614   ClearTile_Road,          // clear_tile_proc
    01615   NULL,                    // add_accepted_cargo_proc
    01616   GetTileDesc_Road,        // get_tile_desc_proc
    01617   GetTileTrackStatus_Road, // get_tile_track_status_proc
    01618   ClickTile_Road,          // click_tile_proc
    01619   NULL,                    // animate_tile_proc
    01620   TileLoop_Road,           // tile_loop_clear
    01621   ChangeTileOwner_Road,    // change_tile_owner_clear
    01622   NULL,                    // add_produced_cargo_proc
    01623   VehicleEnter_Road,       // vehicle_enter_tile_proc
    01624   GetFoundation_Road,      // get_foundation_proc
    01625   TerraformTile_Road,      // terraform_tile_proc
    01626 };