road_cmd.cpp

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00001 /* $Id: road_cmd.cpp 22080 2011-02-14 19:52:26Z planetmaker $ */
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   cost.AddCost(CountBits(pieces) * _price[PR_BUILD_ROAD]);
00666 
00667   if (!need_to_clear && IsTileType(tile, MP_TUNNELBRIDGE)) {
00668     /* Pay for *every* tile of the bridge or tunnel */
00669     cost.MultiplyCost(GetTunnelBridgeLength(GetOtherTunnelBridgeEnd(tile), tile) + 2);
00670   }
00671 
00672   if (flags & DC_EXEC) {
00673     switch (GetTileType(tile)) {
00674       case MP_ROAD: {
00675         RoadTileType rtt = GetRoadTileType(tile);
00676         if (existing == ROAD_NONE || rtt == ROAD_TILE_CROSSING) {
00677           SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00678           SetRoadOwner(tile, rt, _current_company);
00679           if (rt == ROADTYPE_ROAD) SetTownIndex(tile, p2);
00680         }
00681         if (rtt != ROAD_TILE_CROSSING) SetRoadBits(tile, existing | pieces, rt);
00682         break;
00683       }
00684 
00685       case MP_TUNNELBRIDGE: {
00686         TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
00687 
00688         SetRoadTypes(other_end, GetRoadTypes(other_end) | RoadTypeToRoadTypes(rt));
00689         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00690         SetRoadOwner(other_end, rt, _current_company);
00691         SetRoadOwner(tile, rt, _current_company);
00692 
00693         /* Mark tiles diry that have been repaved */
00694         MarkTileDirtyByTile(other_end);
00695         MarkTileDirtyByTile(tile);
00696         if (IsBridge(tile)) {
00697           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
00698 
00699           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
00700         }
00701         break;
00702       }
00703 
00704       case MP_STATION:
00705         assert(IsDriveThroughStopTile(tile));
00706         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00707         SetRoadOwner(tile, rt, _current_company);
00708         break;
00709 
00710       default:
00711         MakeRoadNormal(tile, pieces, RoadTypeToRoadTypes(rt), p2, _current_company, _current_company);
00712         break;
00713     }
00714 
00715     if (rt != ROADTYPE_TRAM && IsNormalRoadTile(tile)) {
00716       existing |= pieces;
00717       SetDisallowedRoadDirections(tile, IsStraightRoad(existing) ?
00718           GetDisallowedRoadDirections(tile) ^ toggle_drd : DRD_NONE);
00719     }
00720 
00721     MarkTileDirtyByTile(tile);
00722   }
00723   return cost;
00724 }
00725 
00741 CommandCost CmdBuildLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00742 {
00743   DisallowedRoadDirections drd = DRD_NORTHBOUND;
00744 
00745   if (p1 >= MapSize()) return CMD_ERROR;
00746 
00747   TileIndex end_tile = p1;
00748   RoadType rt = Extract<RoadType, 3, 2>(p2);
00749   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00750 
00751   Axis axis = Extract<Axis, 2, 1>(p2);
00752   /* Only drag in X or Y direction dictated by the direction variable */
00753   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00754   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00755 
00756   DiagDirection dir = AxisToDiagDir(axis);
00757 
00758   /* Swap direction, also the half-tile drag var (bit 0 and 1) */
00759   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00760     dir = ReverseDiagDir(dir);
00761     p2 ^= 3;
00762     drd = DRD_SOUTHBOUND;
00763   }
00764 
00765   /* On the X-axis, we have to swap the initial bits, so they
00766    * will be interpreted correctly in the GTTS. Futhermore
00767    * when you just 'click' on one tile to build them. */
00768   if ((axis == AXIS_Y) == (start_tile == end_tile && HasBit(p2, 0) == HasBit(p2, 1))) drd ^= DRD_BOTH;
00769   /* No disallowed direction bits have to be toggled */
00770   if (!HasBit(p2, 5)) drd = DRD_NONE;
00771 
00772   CommandCost cost(EXPENSES_CONSTRUCTION);
00773   CommandCost last_error = CMD_ERROR;
00774   TileIndex tile = start_tile;
00775   bool had_bridge = false;
00776   bool had_tunnel = false;
00777   bool had_success = false;
00778   /* Start tile is the first tile clicked by the user. */
00779   for (;;) {
00780     RoadBits bits = AxisToRoadBits(axis);
00781 
00782     /* Road parts only have to be built at the start tile or at the end tile. */
00783     if (tile == end_tile && !HasBit(p2, 1)) bits &= DiagDirToRoadBits(ReverseDiagDir(dir));
00784     if (tile == start_tile && HasBit(p2, 0)) bits &= DiagDirToRoadBits(dir);
00785 
00786     CommandCost ret = DoCommand(tile, drd << 6 | rt << 4 | bits, 0, flags, CMD_BUILD_ROAD);
00787     if (ret.Failed()) {
00788       last_error = ret;
00789       if (last_error.GetErrorMessage() != STR_ERROR_ALREADY_BUILT) {
00790         if (HasBit(p2, 6)) return last_error;
00791         break;
00792       }
00793     } else {
00794       had_success = true;
00795       /* Only pay for the upgrade on one side of the bridges and tunnels */
00796       if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00797         if (IsBridge(tile)) {
00798           if (!had_bridge || GetTunnelBridgeDirection(tile) == dir) {
00799             cost.AddCost(ret);
00800           }
00801           had_bridge = true;
00802         } else { // IsTunnel(tile)
00803           if (!had_tunnel || GetTunnelBridgeDirection(tile) == dir) {
00804             cost.AddCost(ret);
00805           }
00806           had_tunnel = true;
00807         }
00808       } else {
00809         cost.AddCost(ret);
00810       }
00811     }
00812 
00813     if (tile == end_tile) break;
00814 
00815     tile += TileOffsByDiagDir(dir);
00816   }
00817 
00818   return had_success ? cost : last_error;
00819 }
00820 
00834 CommandCost CmdRemoveLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00835 {
00836   CommandCost cost(EXPENSES_CONSTRUCTION);
00837 
00838   if (p1 >= MapSize()) return CMD_ERROR;
00839 
00840   TileIndex end_tile = p1;
00841   RoadType rt = Extract<RoadType, 3, 2>(p2);
00842   if (!IsValidRoadType(rt)) return CMD_ERROR;
00843 
00844   Axis axis = Extract<Axis, 2, 1>(p2);
00845   /* Only drag in X or Y direction dictated by the direction variable */
00846   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00847   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00848 
00849   /* Swap start and ending tile, also the half-tile drag var (bit 0 and 1) */
00850   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00851     TileIndex t = start_tile;
00852     start_tile = end_tile;
00853     end_tile = t;
00854     p2 ^= IsInsideMM(p2 & 3, 1, 3) ? 3 : 0;
00855   }
00856 
00857   Money money = GetAvailableMoneyForCommand();
00858   TileIndex tile = start_tile;
00859   CommandCost last_error = CMD_ERROR;
00860   bool had_success = false;
00861   /* Start tile is the small number. */
00862   for (;;) {
00863     RoadBits bits = AxisToRoadBits(axis);
00864 
00865     if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
00866     if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
00867 
00868     /* try to remove the halves. */
00869     if (bits != 0) {
00870       CommandCost ret = RemoveRoad(tile, flags & ~DC_EXEC, bits, rt, true);
00871       if (ret.Succeeded()) {
00872         if (flags & DC_EXEC) {
00873           money -= ret.GetCost();
00874           if (money < 0) {
00875             _additional_cash_required = DoCommand(start_tile, end_tile, p2, flags & ~DC_EXEC, CMD_REMOVE_LONG_ROAD).GetCost();
00876             return cost;
00877           }
00878           RemoveRoad(tile, flags, bits, rt, true, false);
00879         }
00880         cost.AddCost(ret);
00881         had_success = true;
00882       } else {
00883         /* Ownership errors are more important. */
00884         if (last_error.GetErrorMessage() != STR_ERROR_OWNED_BY) last_error = ret;
00885       }
00886     }
00887 
00888     if (tile == end_tile) break;
00889 
00890     tile += (axis == AXIS_Y) ? TileDiffXY(0, 1) : TileDiffXY(1, 0);
00891   }
00892 
00893   return had_success ? cost : last_error;
00894 }
00895 
00909 CommandCost CmdBuildRoadDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00910 {
00911   DiagDirection dir = Extract<DiagDirection, 0, 2>(p1);
00912   RoadType rt = Extract<RoadType, 2, 2>(p1);
00913 
00914   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00915 
00916   Slope tileh = GetTileSlope(tile, NULL);
00917   if (tileh != SLOPE_FLAT && (
00918         !_settings_game.construction.build_on_slopes ||
00919         IsSteepSlope(tileh) ||
00920         !CanBuildDepotByTileh(dir, tileh)
00921       )) {
00922     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00923   }
00924 
00925   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00926   if (cost.Failed()) return cost;
00927 
00928   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
00929 
00930   if (!Depot::CanAllocateItem()) return CMD_ERROR;
00931 
00932   if (flags & DC_EXEC) {
00933     Depot *dep = new Depot(tile);
00934     dep->build_date = _date;
00935 
00936     MakeRoadDepot(tile, _current_company, dep->index, dir, rt);
00937     MarkTileDirtyByTile(tile);
00938     MakeDefaultName(dep);
00939   }
00940   cost.AddCost(_price[PR_BUILD_DEPOT_ROAD]);
00941   return cost;
00942 }
00943 
00944 static CommandCost RemoveRoadDepot(TileIndex tile, DoCommandFlag flags)
00945 {
00946   if (_current_company != OWNER_WATER) {
00947     CommandCost ret = CheckTileOwnership(tile);
00948     if (ret.Failed()) return ret;
00949   }
00950 
00951   CommandCost ret = EnsureNoVehicleOnGround(tile);
00952   if (ret.Failed()) return ret;
00953 
00954   if (flags & DC_EXEC) {
00955     delete Depot::GetByTile(tile);
00956     DoClearSquare(tile);
00957   }
00958 
00959   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_ROAD]);
00960 }
00961 
00962 static CommandCost ClearTile_Road(TileIndex tile, DoCommandFlag flags)
00963 {
00964   switch (GetRoadTileType(tile)) {
00965     case ROAD_TILE_NORMAL: {
00966       RoadBits b = GetAllRoadBits(tile);
00967 
00968       /* Clear the road if only one piece is on the tile OR we are not using the DC_AUTO flag */
00969       if ((HasExactlyOneBit(b) && GetRoadBits(tile, ROADTYPE_TRAM) == ROAD_NONE) || !(flags & DC_AUTO)) {
00970         CommandCost ret(EXPENSES_CONSTRUCTION);
00971         RoadType rt;
00972         FOR_EACH_SET_ROADTYPE(rt, GetRoadTypes(tile)) {
00973           CommandCost tmp_ret = RemoveRoad(tile, flags, GetRoadBits(tile, rt), rt, true);
00974           if (tmp_ret.Failed()) return tmp_ret;
00975           ret.AddCost(tmp_ret);
00976         }
00977         return ret;
00978       }
00979       return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
00980     }
00981 
00982     case ROAD_TILE_CROSSING: {
00983       RoadTypes rts = GetRoadTypes(tile);
00984       CommandCost ret(EXPENSES_CONSTRUCTION);
00985 
00986       if (flags & DC_AUTO) return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
00987 
00988       /* Must iterate over the roadtypes in a reverse manner because
00989        * tram tracks must be removed before the road bits. */
00990       RoadType rt = ROADTYPE_TRAM;
00991       do {
00992         if (HasBit(rts, rt)) {
00993           CommandCost tmp_ret = RemoveRoad(tile, flags, GetCrossingRoadBits(tile), rt, false);
00994           if (tmp_ret.Failed()) return tmp_ret;
00995           ret.AddCost(tmp_ret);
00996         }
00997       } while (rt-- != ROADTYPE_ROAD);
00998 
00999       if (flags & DC_EXEC) {
01000         DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
01001       }
01002       return ret;
01003     }
01004 
01005     default:
01006     case ROAD_TILE_DEPOT:
01007       if (flags & DC_AUTO) {
01008         return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
01009       }
01010       return RemoveRoadDepot(tile, flags);
01011   }
01012 }
01013 
01014 
01015 struct DrawRoadTileStruct {
01016   uint16 image;
01017   byte subcoord_x;
01018   byte subcoord_y;
01019 };
01020 
01021 #include "table/road_land.h"
01022 
01030 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits)
01031 {
01032   /* Flat land and land without a road doesn't require a foundation */
01033   if (tileh == SLOPE_FLAT || bits == ROAD_NONE) return FOUNDATION_NONE;
01034 
01035   if (!IsSteepSlope(tileh)) {
01036     /* Leveled RoadBits on a slope */
01037     if ((_invalid_tileh_slopes_road[0][tileh] & bits) == ROAD_NONE) return FOUNDATION_LEVELED;
01038 
01039     /* Straight roads without foundation on a slope */
01040     if (!IsSlopeWithOneCornerRaised(tileh) &&
01041         (_invalid_tileh_slopes_road[1][tileh] & bits) == ROAD_NONE)
01042       return FOUNDATION_NONE;
01043   }
01044 
01045   /* Roads on steep Slopes or on Slopes with one corner raised */
01046   return (bits == ROAD_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
01047 }
01048 
01049 const byte _road_sloped_sprites[14] = {
01050   0,  0,  2,  0,
01051   0,  1,  0,  0,
01052   3,  0,  0,  0,
01053   0,  0
01054 };
01055 
01066 static bool AlwaysDrawUnpavedRoads(TileIndex tile, Roadside roadside)
01067 {
01068   return (IsOnSnow(tile) &&
01069       !(_settings_game.game_creation.landscape == LT_TROPIC && HasGrfMiscBit(GMB_DESERT_PAVED_ROADS) &&
01070         roadside != ROADSIDE_BARREN && roadside != ROADSIDE_GRASS && roadside != ROADSIDE_GRASS_ROAD_WORKS));
01071 }
01072 
01078 void DrawTramCatenary(const TileInfo *ti, RoadBits tram)
01079 {
01080   /* Do not draw catenary if it is invisible */
01081   if (IsInvisibilitySet(TO_CATENARY)) return;
01082 
01083   /* Don't draw the catenary under a low bridge */
01084   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_CATENARY)) {
01085     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01086 
01087     if (height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) return;
01088   }
01089 
01090   SpriteID front;
01091   SpriteID back;
01092 
01093   if (ti->tileh != SLOPE_FLAT) {
01094     back  = SPR_TRAMWAY_BACK_WIRES_SLOPED  + _road_sloped_sprites[ti->tileh - 1];
01095     front = SPR_TRAMWAY_FRONT_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
01096   } else {
01097     back  = SPR_TRAMWAY_BASE + _road_backpole_sprites_1[tram];
01098     front = SPR_TRAMWAY_BASE + _road_frontwire_sprites_1[tram];
01099   }
01100 
01101   AddSortableSpriteToDraw(back,  PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01102   AddSortableSpriteToDraw(front, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01103 }
01104 
01113 static void DrawRoadDetail(SpriteID img, const TileInfo *ti, int dx, int dy, int h)
01114 {
01115   int x = ti->x | dx;
01116   int y = ti->y | dy;
01117   byte z = ti->z;
01118   if (ti->tileh != SLOPE_FLAT) z = GetSlopeZ(x, y);
01119   AddSortableSpriteToDraw(img, PAL_NONE, x, y, 2, 2, h, z);
01120 }
01121 
01126 static void DrawRoadBits(TileInfo *ti)
01127 {
01128   RoadBits road = GetRoadBits(ti->tile, ROADTYPE_ROAD);
01129   RoadBits tram = GetRoadBits(ti->tile, ROADTYPE_TRAM);
01130 
01131   SpriteID image = 0;
01132   PaletteID pal = PAL_NONE;
01133 
01134   if (ti->tileh != SLOPE_FLAT) {
01135     DrawFoundation(ti, GetRoadFoundation(ti->tileh, road | tram));
01136 
01137     /* DrawFoundation() modifies ti.
01138      * Default sloped sprites.. */
01139     if (ti->tileh != SLOPE_FLAT) image = _road_sloped_sprites[ti->tileh - 1] + 0x53F;
01140   }
01141 
01142   if (image == 0) image = _road_tile_sprites_1[road != ROAD_NONE ? road : tram];
01143 
01144   Roadside roadside = GetRoadside(ti->tile);
01145 
01146   if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01147     image += 19;
01148   } else {
01149     switch (roadside) {
01150       case ROADSIDE_BARREN:           pal = PALETTE_TO_BARE_LAND; break;
01151       case ROADSIDE_GRASS:            break;
01152       case ROADSIDE_GRASS_ROAD_WORKS: break;
01153       default:                        image -= 19; break; // Paved
01154     }
01155   }
01156 
01157   DrawGroundSprite(image, pal);
01158 
01159   /* For tram we overlay the road graphics with either tram tracks only
01160    * (when there is actual road beneath the trams) or with tram tracks
01161    * and some dirts which hides the road graphics */
01162   if (tram != ROAD_NONE) {
01163     if (ti->tileh != SLOPE_FLAT) {
01164       image = _road_sloped_sprites[ti->tileh - 1] + SPR_TRAMWAY_SLOPED_OFFSET;
01165     } else {
01166       image = _road_tile_sprites_1[tram] - SPR_ROAD_Y;
01167     }
01168     image += (road == ROAD_NONE) ? SPR_TRAMWAY_TRAM : SPR_TRAMWAY_OVERLAY;
01169     DrawGroundSprite(image, pal);
01170   }
01171 
01172   if (road != ROAD_NONE) {
01173     DisallowedRoadDirections drd = GetDisallowedRoadDirections(ti->tile);
01174     if (drd != DRD_NONE) {
01175       DrawGroundSpriteAt(SPR_ONEWAY_BASE + drd - 1 + ((road == ROAD_X) ? 0 : 3), PAL_NONE, 8, 8, GetPartialZ(8, 8, ti->tileh));
01176     }
01177   }
01178 
01179   if (HasRoadWorks(ti->tile)) {
01180     /* Road works */
01181     DrawGroundSprite((road | tram) & ROAD_X ? SPR_EXCAVATION_X : SPR_EXCAVATION_Y, PAL_NONE);
01182     return;
01183   }
01184 
01185   if (tram != ROAD_NONE) DrawTramCatenary(ti, tram);
01186 
01187   /* Return if full detail is disabled, or we are zoomed fully out. */
01188   if (!HasBit(_display_opt, DO_FULL_DETAIL) || _cur_dpi->zoom > ZOOM_LVL_DETAIL) return;
01189 
01190   /* Do not draw details (street lights, trees) under low bridge */
01191   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && (roadside == ROADSIDE_TREES || roadside == ROADSIDE_STREET_LIGHTS)) {
01192     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01193     uint minz = GetTileMaxZ(ti->tile) + 2 * TILE_HEIGHT;
01194 
01195     if (roadside == ROADSIDE_TREES) minz += TILE_HEIGHT;
01196 
01197     if (height < minz) return;
01198   }
01199 
01200   /* If there are no road bits, return, as there is nothing left to do */
01201   if (HasAtMostOneBit(road)) return;
01202 
01203   /* Draw extra details. */
01204   for (const DrawRoadTileStruct *drts = _road_display_table[roadside][road | tram]; drts->image != 0; drts++) {
01205     DrawRoadDetail(drts->image, ti, drts->subcoord_x, drts->subcoord_y, 0x10);
01206   }
01207 }
01208 
01210 static void DrawTile_Road(TileInfo *ti)
01211 {
01212   switch (GetRoadTileType(ti->tile)) {
01213     case ROAD_TILE_NORMAL:
01214       DrawRoadBits(ti);
01215       break;
01216 
01217     case ROAD_TILE_CROSSING: {
01218       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01219 
01220       PaletteID pal = PAL_NONE;
01221       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
01222 
01223       if (rti->UsesOverlay()) {
01224         Axis axis = GetCrossingRailAxis(ti->tile);
01225         SpriteID road = SPR_ROAD_Y + axis;
01226 
01227         Roadside roadside = GetRoadside(ti->tile);
01228 
01229         if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01230           road += 19;
01231         } else {
01232           switch (roadside) {
01233             case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
01234             case ROADSIDE_GRASS:  break;
01235             default:              road -= 19; break; // Paved
01236           }
01237         }
01238 
01239         DrawGroundSprite(road, pal);
01240 
01241         SpriteID rail = GetCustomRailSprite(rti, ti->tile, RTSG_CROSSING) + axis;
01242         /* Draw tracks, but draw PBS reserved tracks darker. */
01243         pal = (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) ? PALETTE_CRASH : PAL_NONE;
01244         DrawGroundSprite(rail, pal);
01245 
01246         DrawRailTileSeq(ti, &_crossing_layout, TO_CATENARY, rail, 0, PAL_NONE);
01247       } else {
01248         SpriteID image = rti->base_sprites.crossing;
01249 
01250         if (GetCrossingRoadAxis(ti->tile) == AXIS_X) image++;
01251         if (IsCrossingBarred(ti->tile)) image += 2;
01252 
01253         Roadside roadside = GetRoadside(ti->tile);
01254 
01255         if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01256           image += 8;
01257         } else {
01258           switch (roadside) {
01259             case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
01260             case ROADSIDE_GRASS:  break;
01261             default:              image += 4; break; // Paved
01262           }
01263         }
01264 
01265         DrawGroundSprite(image, pal);
01266 
01267         /* PBS debugging, draw reserved tracks darker */
01268         if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) {
01269           DrawGroundSprite(GetCrossingRoadAxis(ti->tile) == AXIS_Y ? GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_x : GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_y, PALETTE_CRASH);
01270         }
01271       }
01272 
01273       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01274         DrawGroundSprite(SPR_TRAMWAY_OVERLAY + (GetCrossingRoadAxis(ti->tile) ^ 1), pal);
01275         DrawTramCatenary(ti, GetCrossingRoadBits(ti->tile));
01276       }
01277       if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01278       break;
01279     }
01280 
01281     default:
01282     case ROAD_TILE_DEPOT: {
01283       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01284 
01285       PaletteID palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
01286 
01287       const DrawTileSprites *dts;
01288       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01289         dts =  &_tram_depot[GetRoadDepotDirection(ti->tile)];
01290       } else {
01291         dts =  &_road_depot[GetRoadDepotDirection(ti->tile)];
01292       }
01293 
01294       DrawGroundSprite(dts->ground.sprite, PAL_NONE);
01295       DrawOrigTileSeq(ti, dts, TO_BUILDINGS, palette);
01296       break;
01297     }
01298   }
01299   DrawBridgeMiddle(ti);
01300 }
01301 
01302 void DrawRoadDepotSprite(int x, int y, DiagDirection dir, RoadType rt)
01303 {
01304   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
01305   const DrawTileSprites *dts = (rt == ROADTYPE_TRAM) ? &_tram_depot[dir] : &_road_depot[dir];
01306 
01307   x += 33;
01308   y += 17;
01309 
01310   DrawSprite(dts->ground.sprite, PAL_NONE, x, y);
01311   DrawOrigTileSeqInGUI(x, y, dts, palette);
01312 }
01313 
01319 void UpdateNearestTownForRoadTiles(bool invalidate)
01320 {
01321   assert(!invalidate || _generating_world);
01322 
01323   for (TileIndex t = 0; t < MapSize(); t++) {
01324     if (IsTileType(t, MP_ROAD) && !IsRoadDepot(t) && !HasTownOwnedRoad(t)) {
01325       TownID tid = (TownID)INVALID_TOWN;
01326       if (!invalidate) {
01327         const Town *town = CalcClosestTownFromTile(t);
01328         if (town != NULL) tid = town->index;
01329       }
01330       SetTownIndex(t, tid);
01331     }
01332   }
01333 }
01334 
01335 static uint GetSlopeZ_Road(TileIndex tile, uint x, uint y)
01336 {
01337   uint z;
01338   Slope tileh = GetTileSlope(tile, &z);
01339 
01340   if (tileh == SLOPE_FLAT) return z;
01341   if (IsNormalRoad(tile)) {
01342     Foundation f = GetRoadFoundation(tileh, GetAllRoadBits(tile));
01343     z += ApplyFoundationToSlope(f, &tileh);
01344     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
01345   } else {
01346     return z + TILE_HEIGHT;
01347   }
01348 }
01349 
01350 static Foundation GetFoundation_Road(TileIndex tile, Slope tileh)
01351 {
01352   if (IsNormalRoad(tile)) {
01353     return GetRoadFoundation(tileh, GetAllRoadBits(tile));
01354   } else {
01355     return FlatteningFoundation(tileh);
01356   }
01357 }
01358 
01359 static const Roadside _town_road_types[][2] = {
01360   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01361   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01362   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01363   { ROADSIDE_TREES,         ROADSIDE_TREES },
01364   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01365 };
01366 
01367 static const Roadside _town_road_types_2[][2] = {
01368   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01369   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01370   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01371   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01372   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01373 };
01374 
01375 
01376 static void TileLoop_Road(TileIndex tile)
01377 {
01378   switch (_settings_game.game_creation.landscape) {
01379     case LT_ARCTIC:
01380       if (IsOnSnow(tile) != (GetTileZ(tile) > GetSnowLine())) {
01381         ToggleSnow(tile);
01382         MarkTileDirtyByTile(tile);
01383       }
01384       break;
01385 
01386     case LT_TROPIC:
01387       if (GetTropicZone(tile) == TROPICZONE_DESERT && !IsOnDesert(tile)) {
01388         ToggleDesert(tile);
01389         MarkTileDirtyByTile(tile);
01390       }
01391       break;
01392   }
01393 
01394   if (IsRoadDepot(tile)) return;
01395 
01396   const Town *t = ClosestTownFromTile(tile, UINT_MAX);
01397   if (!HasRoadWorks(tile)) {
01398     HouseZonesBits grp = HZB_TOWN_EDGE;
01399 
01400     if (t != NULL) {
01401       grp = GetTownRadiusGroup(t, tile);
01402 
01403       /* Show an animation to indicate road work */
01404       if (t->road_build_months != 0 &&
01405           (DistanceManhattan(t->xy, tile) < 8 || grp != HZB_TOWN_EDGE) &&
01406           IsNormalRoad(tile) && !HasAtMostOneBit(GetAllRoadBits(tile))) {
01407         if (GetFoundationSlope(tile, NULL) == SLOPE_FLAT && EnsureNoVehicleOnGround(tile).Succeeded() && Chance16(1, 40)) {
01408           StartRoadWorks(tile);
01409 
01410           SndPlayTileFx(SND_21_JACKHAMMER, tile);
01411           CreateEffectVehicleAbove(
01412             TileX(tile) * TILE_SIZE + 7,
01413             TileY(tile) * TILE_SIZE + 7,
01414             0,
01415             EV_BULLDOZER);
01416           MarkTileDirtyByTile(tile);
01417           return;
01418         }
01419       }
01420     }
01421 
01422     {
01423       /* Adjust road ground type depending on 'grp' (grp is the distance to the center) */
01424       const Roadside *new_rs = (_settings_game.game_creation.landscape == LT_TOYLAND) ? _town_road_types_2[grp] : _town_road_types[grp];
01425       Roadside cur_rs = GetRoadside(tile);
01426 
01427       /* We have our desired type, do nothing */
01428       if (cur_rs == new_rs[0]) return;
01429 
01430       /* We have the pre-type of the desired type, switch to the desired type */
01431       if (cur_rs == new_rs[1]) {
01432         cur_rs = new_rs[0];
01433       /* We have barren land, install the pre-type */
01434       } else if (cur_rs == ROADSIDE_BARREN) {
01435         cur_rs = new_rs[1];
01436       /* We're totally off limits, remove any installation and make barren land */
01437       } else {
01438         cur_rs = ROADSIDE_BARREN;
01439       }
01440       SetRoadside(tile, cur_rs);
01441       MarkTileDirtyByTile(tile);
01442     }
01443   } else if (IncreaseRoadWorksCounter(tile)) {
01444     TerminateRoadWorks(tile);
01445 
01446     if (_settings_game.economy.mod_road_rebuild) {
01447       /* Generate a nicer town surface */
01448       const RoadBits old_rb = GetAnyRoadBits(tile, ROADTYPE_ROAD);
01449       const RoadBits new_rb = CleanUpRoadBits(tile, old_rb);
01450 
01451       if (old_rb != new_rb) {
01452         RemoveRoad(tile, DC_EXEC | DC_AUTO | DC_NO_WATER, (old_rb ^ new_rb), ROADTYPE_ROAD, true);
01453       }
01454     }
01455 
01456     MarkTileDirtyByTile(tile);
01457   }
01458 }
01459 
01460 static bool ClickTile_Road(TileIndex tile)
01461 {
01462   if (!IsRoadDepot(tile)) return false;
01463 
01464   ShowDepotWindow(tile, VEH_ROAD);
01465   return true;
01466 }
01467 
01468 /* Converts RoadBits to TrackBits */
01469 static const byte _road_trackbits[16] = {
01470   0x0, 0x0, 0x0, 0x10, 0x0, 0x2, 0x8, 0x1A, 0x0, 0x4, 0x1, 0x15, 0x20, 0x26, 0x29, 0x3F,
01471 };
01472 
01473 static TrackStatus GetTileTrackStatus_Road(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
01474 {
01475   TrackdirBits trackdirbits = TRACKDIR_BIT_NONE;
01476   TrackdirBits red_signals = TRACKDIR_BIT_NONE; // crossing barred
01477   switch (mode) {
01478     case TRANSPORT_RAIL:
01479       if (IsLevelCrossing(tile)) trackdirbits = TrackBitsToTrackdirBits(GetCrossingRailBits(tile));
01480       break;
01481 
01482     case TRANSPORT_ROAD:
01483       if ((GetRoadTypes(tile) & sub_mode) == 0) break;
01484       switch (GetRoadTileType(tile)) {
01485         case ROAD_TILE_NORMAL: {
01486           const uint drd_to_multiplier[DRD_END] = { 0x101, 0x100, 0x1, 0x0 };
01487           RoadType rt = (RoadType)FindFirstBit(sub_mode);
01488           RoadBits bits = GetRoadBits(tile, rt);
01489 
01490           /* no roadbit at this side of tile, return 0 */
01491           if (side != INVALID_DIAGDIR && (DiagDirToRoadBits(side) & bits) == 0) break;
01492 
01493           uint multiplier = drd_to_multiplier[rt == ROADTYPE_TRAM ? DRD_NONE : GetDisallowedRoadDirections(tile)];
01494           if (!HasRoadWorks(tile)) trackdirbits = (TrackdirBits)(_road_trackbits[bits] * multiplier);
01495           break;
01496         }
01497 
01498         case ROAD_TILE_CROSSING: {
01499           Axis axis = GetCrossingRoadAxis(tile);
01500 
01501           if (side != INVALID_DIAGDIR && axis != DiagDirToAxis(side)) break;
01502 
01503           trackdirbits = TrackBitsToTrackdirBits(AxisToTrackBits(axis));
01504           if (IsCrossingBarred(tile)) red_signals = trackdirbits;
01505           break;
01506         }
01507 
01508         default:
01509         case ROAD_TILE_DEPOT: {
01510           DiagDirection dir = GetRoadDepotDirection(tile);
01511 
01512           if (side != INVALID_DIAGDIR && side != dir) break;
01513 
01514           trackdirbits = TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir));
01515           break;
01516         }
01517       }
01518       break;
01519 
01520     default: break;
01521   }
01522   return CombineTrackStatus(trackdirbits, red_signals);
01523 }
01524 
01525 static const StringID _road_tile_strings[] = {
01526   STR_LAI_ROAD_DESCRIPTION_ROAD,
01527   STR_LAI_ROAD_DESCRIPTION_ROAD,
01528   STR_LAI_ROAD_DESCRIPTION_ROAD,
01529   STR_LAI_ROAD_DESCRIPTION_ROAD_WITH_STREETLIGHTS,
01530   STR_LAI_ROAD_DESCRIPTION_ROAD,
01531   STR_LAI_ROAD_DESCRIPTION_TREE_LINED_ROAD,
01532   STR_LAI_ROAD_DESCRIPTION_ROAD,
01533   STR_LAI_ROAD_DESCRIPTION_ROAD,
01534 };
01535 
01536 static void GetTileDesc_Road(TileIndex tile, TileDesc *td)
01537 {
01538   Owner rail_owner = INVALID_OWNER;
01539   Owner road_owner = INVALID_OWNER;
01540   Owner tram_owner = INVALID_OWNER;
01541 
01542   switch (GetRoadTileType(tile)) {
01543     case ROAD_TILE_CROSSING: {
01544       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_RAIL_LEVEL_CROSSING;
01545       RoadTypes rts = GetRoadTypes(tile);
01546       rail_owner = GetTileOwner(tile);
01547       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01548       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01549 
01550       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
01551       td->rail_speed = rti->max_speed;
01552 
01553       break;
01554     }
01555 
01556     case ROAD_TILE_DEPOT:
01557       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_VEHICLE_DEPOT;
01558       road_owner = GetTileOwner(tile); // Tile has only one owner, roadtype does not matter
01559       td->build_date = Depot::GetByTile(tile)->build_date;
01560       break;
01561 
01562     default: {
01563       RoadTypes rts = GetRoadTypes(tile);
01564       td->str = (HasBit(rts, ROADTYPE_ROAD) ? _road_tile_strings[GetRoadside(tile)] : STR_LAI_ROAD_DESCRIPTION_TRAMWAY);
01565       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01566       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01567       break;
01568     }
01569   }
01570 
01571   /* Now we have to discover, if the tile has only one owner or many:
01572    *   - Find a first_owner of the tile. (Currently road or tram must be present, but this will break when the third type becomes available)
01573    *   - Compare the found owner with the other owners, and test if they differ.
01574    * Note: If road exists it will be the first_owner.
01575    */
01576   Owner first_owner = (road_owner == INVALID_OWNER ? tram_owner : road_owner);
01577   bool mixed_owners = (tram_owner != INVALID_OWNER && tram_owner != first_owner) || (rail_owner != INVALID_OWNER && rail_owner != first_owner);
01578 
01579   if (mixed_owners) {
01580     /* Multiple owners */
01581     td->owner_type[0] = (rail_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_RAIL_OWNER);
01582     td->owner[0] = rail_owner;
01583     td->owner_type[1] = (road_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_ROAD_OWNER);
01584     td->owner[1] = road_owner;
01585     td->owner_type[2] = (tram_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_TRAM_OWNER);
01586     td->owner[2] = tram_owner;
01587   } else {
01588     /* One to rule them all */
01589     td->owner[0] = first_owner;
01590   }
01591 }
01592 
01597 static const byte _roadveh_enter_depot_dir[4] = {
01598   TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE
01599 };
01600 
01601 static VehicleEnterTileStatus VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
01602 {
01603   switch (GetRoadTileType(tile)) {
01604     case ROAD_TILE_DEPOT: {
01605       if (v->type != VEH_ROAD) break;
01606 
01607       RoadVehicle *rv = RoadVehicle::From(v);
01608       if (rv->frame == RVC_DEPOT_STOP_FRAME &&
01609           _roadveh_enter_depot_dir[GetRoadDepotDirection(tile)] == rv->state) {
01610         rv->state = RVSB_IN_DEPOT;
01611         rv->vehstatus |= VS_HIDDEN;
01612         rv->direction = ReverseDir(rv->direction);
01613         if (rv->Next() == NULL) VehicleEnterDepot(rv->First());
01614         rv->tile = tile;
01615 
01616         InvalidateWindowData(WC_VEHICLE_DEPOT, rv->tile);
01617         return VETSB_ENTERED_WORMHOLE;
01618       }
01619       break;
01620     }
01621 
01622     default: break;
01623   }
01624   return VETSB_CONTINUE;
01625 }
01626 
01627 
01628 static void ChangeTileOwner_Road(TileIndex tile, Owner old_owner, Owner new_owner)
01629 {
01630   if (IsRoadDepot(tile)) {
01631     if (GetTileOwner(tile) == old_owner) {
01632       if (new_owner == INVALID_OWNER) {
01633         DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
01634       } else {
01635         SetTileOwner(tile, new_owner);
01636       }
01637     }
01638     return;
01639   }
01640 
01641   for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
01642     /* Update all roadtypes, no matter if they are present */
01643     if (GetRoadOwner(tile, rt) == old_owner) {
01644       SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
01645     }
01646   }
01647 
01648   if (IsLevelCrossing(tile)) {
01649     if (GetTileOwner(tile) == old_owner) {
01650       if (new_owner == INVALID_OWNER) {
01651         DoCommand(tile, 0, GetCrossingRailTrack(tile), DC_EXEC | DC_BANKRUPT, CMD_REMOVE_SINGLE_RAIL);
01652       } else {
01653         SetTileOwner(tile, new_owner);
01654       }
01655     }
01656   }
01657 }
01658 
01659 static CommandCost TerraformTile_Road(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
01660 {
01661   if (_settings_game.construction.build_on_slopes && AutoslopeEnabled()) {
01662     switch (GetRoadTileType(tile)) {
01663       case ROAD_TILE_CROSSING:
01664         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]);
01665         break;
01666 
01667       case ROAD_TILE_DEPOT:
01668         if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRoadDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01669         break;
01670 
01671       case ROAD_TILE_NORMAL: {
01672         RoadBits bits = GetAllRoadBits(tile);
01673         RoadBits bits_copy = bits;
01674         /* Check if the slope-road_bits combination is valid at all, i.e. it is safe to call GetRoadFoundation(). */
01675         if (CheckRoadSlope(tileh_new, &bits_copy, ROAD_NONE, ROAD_NONE).Succeeded()) {
01676           /* CheckRoadSlope() sometimes changes the road_bits, if it does not agree with them. */
01677           if (bits == bits_copy) {
01678             uint z_old;
01679             Slope tileh_old = GetTileSlope(tile, &z_old);
01680 
01681             /* Get the slope on top of the foundation */
01682             z_old += ApplyFoundationToSlope(GetRoadFoundation(tileh_old, bits), &tileh_old);
01683             z_new += ApplyFoundationToSlope(GetRoadFoundation(tileh_new, bits), &tileh_new);
01684 
01685             /* The surface slope must not be changed */
01686             if ((z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01687           }
01688         }
01689         break;
01690       }
01691 
01692       default: NOT_REACHED();
01693     }
01694   }
01695 
01696   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
01697 }
01698 
01700 extern const TileTypeProcs _tile_type_road_procs = {
01701   DrawTile_Road,           // draw_tile_proc
01702   GetSlopeZ_Road,          // get_slope_z_proc
01703   ClearTile_Road,          // clear_tile_proc
01704   NULL,                    // add_accepted_cargo_proc
01705   GetTileDesc_Road,        // get_tile_desc_proc
01706   GetTileTrackStatus_Road, // get_tile_track_status_proc
01707   ClickTile_Road,          // click_tile_proc
01708   NULL,                    // animate_tile_proc
01709   TileLoop_Road,           // tile_loop_clear
01710   ChangeTileOwner_Road,    // change_tile_owner_clear
01711   NULL,                    // add_produced_cargo_proc
01712   VehicleEnter_Road,       // vehicle_enter_tile_proc
01713   GetFoundation_Road,      // get_foundation_proc
01714   TerraformTile_Road,      // terraform_tile_proc
01715 };

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