road_cmd.cpp

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00001 /* $Id: road_cmd.cpp 19665 2010-04-17 22:27:49Z rubidium $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #include "stdafx.h"
00013 #include "cmd_helper.h"
00014 #include "road_internal.h"
00015 #include "landscape.h"
00016 #include "viewport_func.h"
00017 #include "command_func.h"
00018 #include "pathfinder/yapf/yapf_cache.h"
00019 #include "depot_base.h"
00020 #include "newgrf.h"
00021 #include "variables.h"
00022 #include "autoslope.h"
00023 #include "tunnelbridge_map.h"
00024 #include "window_func.h"
00025 #include "strings_func.h"
00026 #include "vehicle_func.h"
00027 #include "sound_func.h"
00028 #include "tunnelbridge.h"
00029 #include "cheat_type.h"
00030 #include "functions.h"
00031 #include "effectvehicle_func.h"
00032 #include "effectvehicle_base.h"
00033 #include "elrail_func.h"
00034 #include "roadveh.h"
00035 #include "town.h"
00036 #include "company_base.h"
00037 #include "core/random_func.hpp"
00038 #include "newgrf_railtype.h"
00039 
00040 #include "table/strings.h"
00041 
00046 bool RoadVehiclesAreBuilt()
00047 {
00048   const RoadVehicle *rv;
00049   FOR_ALL_ROADVEHICLES(rv) return true;
00050 
00051   return false;
00052 }
00053 
00054 #define M(x) (1 << (x))
00055 /* Level crossings may only be built on these slopes */
00056 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));
00057 #undef M
00058 
00059 /* Invalid RoadBits on slopes  */
00060 static const RoadBits _invalid_tileh_slopes_road[2][15] = {
00061   /* The inverse of the mixable RoadBits on a leveled slope */
00062   {
00063     ROAD_NONE,         // SLOPE_FLAT
00064     ROAD_NE | ROAD_SE, // SLOPE_W
00065     ROAD_NE | ROAD_NW, // SLOPE_S
00066 
00067     ROAD_NE,           // SLOPE_SW
00068     ROAD_NW | ROAD_SW, // SLOPE_E
00069     ROAD_NONE,         // SLOPE_EW
00070 
00071     ROAD_NW,           // SLOPE_SE
00072     ROAD_NONE,         // SLOPE_WSE
00073     ROAD_SE | ROAD_SW, // SLOPE_N
00074 
00075     ROAD_SE,           // SLOPE_NW
00076     ROAD_NONE,         // SLOPE_NS
00077     ROAD_NONE,         // SLOPE_ENW
00078 
00079     ROAD_SW,           // SLOPE_NE
00080     ROAD_NONE,         // SLOPE_SEN
00081     ROAD_NONE          // SLOPE_NWS
00082   },
00083   /* The inverse of the allowed straight roads on a slope
00084    * (with and without a foundation). */
00085   {
00086     ROAD_NONE, // SLOPE_FLAT
00087     ROAD_NONE, // SLOPE_W    Foundation
00088     ROAD_NONE, // SLOPE_S    Foundation
00089 
00090     ROAD_Y,    // SLOPE_SW
00091     ROAD_NONE, // SLOPE_E    Foundation
00092     ROAD_ALL,  // SLOPE_EW
00093 
00094     ROAD_X,    // SLOPE_SE
00095     ROAD_ALL,  // SLOPE_WSE
00096     ROAD_NONE, // SLOPE_N    Foundation
00097 
00098     ROAD_X,    // SLOPE_NW
00099     ROAD_ALL,  // SLOPE_NS
00100     ROAD_ALL,  // SLOPE_ENW
00101 
00102     ROAD_Y,    // SLOPE_NE
00103     ROAD_ALL,  // SLOPE_SEN
00104     ROAD_ALL   // SLOPE_NW
00105   }
00106 };
00107 
00108 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits);
00109 
00120 bool CheckAllowRemoveRoad(TileIndex tile, RoadBits remove, Owner owner, RoadType rt, DoCommandFlag flags, bool town_check)
00121 {
00122   if (_game_mode == GM_EDITOR || remove == ROAD_NONE) return true;
00123 
00124   /* Water can always flood and towns can always remove "normal" road pieces.
00125    * Towns are not be allowed to remove non "normal" road pieces, like tram
00126    * tracks as that would result in trams that cannot turn. */
00127   if (_current_company == OWNER_WATER ||
00128       (rt == ROADTYPE_ROAD && !Company::IsValidID(_current_company))) return true;
00129 
00130   /* Only do the special processing if the road is owned
00131    * by a town */
00132   if (owner != OWNER_TOWN) return (owner == OWNER_NONE) || CheckOwnership(owner);
00133 
00134   if (!town_check) return true;
00135 
00136   if (_cheats.magic_bulldozer.value) return true;
00137 
00138   Town *t = ClosestTownFromTile(tile, UINT_MAX);
00139   if (t == NULL) return true;
00140 
00141   /* check if you're allowed to remove the street owned by a town
00142    * removal allowance depends on difficulty setting */
00143   if (!CheckforTownRating(flags, t, ROAD_REMOVE)) return false;
00144 
00145   /* Get a bitmask of which neighbouring roads has a tile */
00146   RoadBits n = ROAD_NONE;
00147   RoadBits present = GetAnyRoadBits(tile, rt);
00148   if ((present & ROAD_NE) && (GetAnyRoadBits(TILE_ADDXY(tile, -1,  0), rt) & ROAD_SW)) n |= ROAD_NE;
00149   if ((present & ROAD_SE) && (GetAnyRoadBits(TILE_ADDXY(tile,  0,  1), rt) & ROAD_NW)) n |= ROAD_SE;
00150   if ((present & ROAD_SW) && (GetAnyRoadBits(TILE_ADDXY(tile,  1,  0), rt) & ROAD_NE)) n |= ROAD_SW;
00151   if ((present & ROAD_NW) && (GetAnyRoadBits(TILE_ADDXY(tile,  0, -1), rt) & ROAD_SE)) n |= ROAD_NW;
00152 
00153   int rating_decrease = RATING_ROAD_DOWN_STEP_EDGE;
00154   /* If 0 or 1 bits are set in n, or if no bits that match the bits to remove,
00155    * then allow it */
00156   if (KillFirstBit(n) != ROAD_NONE && (n & remove) != ROAD_NONE) {
00157     /* you can remove all kind of roads with extra dynamite */
00158     if (!_settings_game.construction.extra_dynamite) {
00159       SetDParam(0, t->index);
00160       _error_message = STR_ERROR_LOCAL_AUTHORITY_REFUSES_TO_ALLOW_THIS;
00161       return false;
00162     }
00163     rating_decrease = RATING_ROAD_DOWN_STEP_INNER;
00164   }
00165   ChangeTownRating(t, rating_decrease, RATING_ROAD_MINIMUM, flags);
00166 
00167   return true;
00168 }
00169 
00170 
00179 static CommandCost RemoveRoad(TileIndex tile, DoCommandFlag flags, RoadBits pieces, RoadType rt, bool crossing_check, bool town_check = true)
00180 {
00181   RoadTypes rts = GetRoadTypes(tile);
00182   /* The tile doesn't have the given road type */
00183   if (!HasBit(rts, rt)) return CMD_ERROR;
00184 
00185   switch (GetTileType(tile)) {
00186     case MP_ROAD:
00187       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00188       break;
00189 
00190     case MP_STATION:
00191       if (!IsDriveThroughStopTile(tile)) return CMD_ERROR;
00192       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00193       break;
00194 
00195     case MP_TUNNELBRIDGE:
00196       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) return CMD_ERROR;
00197       if (HasVehicleOnTunnelBridge(tile, GetOtherTunnelBridgeEnd(tile))) return CMD_ERROR;
00198       break;
00199 
00200     default:
00201       return CMD_ERROR;
00202   }
00203 
00204   if (!CheckAllowRemoveRoad(tile, pieces, GetRoadOwner(tile, rt), rt, flags, town_check)) return CMD_ERROR;
00205 
00206   if (!IsTileType(tile, MP_ROAD)) {
00207     /* If it's the last roadtype, just clear the whole tile */
00208     if (rts == RoadTypeToRoadTypes(rt)) return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00209 
00210     CommandCost cost(EXPENSES_CONSTRUCTION);
00211     if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00212       TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
00213       /* Pay for *every* tile of the bridge or tunnel */
00214       cost.AddCost((GetTunnelBridgeLength(other_end, tile) + 2) * _price[PR_CLEAR_ROAD]);
00215       if (flags & DC_EXEC) {
00216         SetRoadTypes(other_end, GetRoadTypes(other_end) & ~RoadTypeToRoadTypes(rt));
00217         SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
00218 
00219         /* If the owner of the bridge sells all it's road, also move the ownership
00220          * to the owner of the other roadtype. */
00221         RoadType other_rt = (rt == ROADTYPE_ROAD) ? ROADTYPE_TRAM : ROADTYPE_ROAD;
00222         Owner other_owner = GetRoadOwner(tile, other_rt);
00223         if (other_owner != GetTileOwner(tile)) {
00224           SetTileOwner(tile, other_owner);
00225           SetTileOwner(other_end, other_owner);
00226         }
00227 
00228         /* Mark tiles diry that have been repaved */
00229         MarkTileDirtyByTile(tile);
00230         MarkTileDirtyByTile(other_end);
00231         if (IsBridge(tile)) {
00232           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
00233 
00234           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
00235         }
00236       }
00237     } else {
00238       assert(IsDriveThroughStopTile(tile));
00239       cost.AddCost(_price[PR_CLEAR_ROAD] * 2);
00240       if (flags & DC_EXEC) {
00241         SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
00242         MarkTileDirtyByTile(tile);
00243       }
00244     }
00245     return cost;
00246   }
00247 
00248   switch (GetRoadTileType(tile)) {
00249     case ROAD_TILE_NORMAL: {
00250       const Slope tileh = GetTileSlope(tile, NULL);
00251       RoadBits present = GetRoadBits(tile, rt);
00252       const RoadBits other = GetOtherRoadBits(tile, rt);
00253       const Foundation f = GetRoadFoundation(tileh, present);
00254 
00255       if (HasRoadWorks(tile) && _current_company != OWNER_WATER) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00256 
00257       /* Autocomplete to a straight road
00258        * @li on steep slopes
00259        * @li if the bits of the other roadtypes result in another foundation
00260        * @li if build on slopes is disabled */
00261       if (IsSteepSlope(tileh) || (IsStraightRoad(other) &&
00262           (other & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) != ROAD_NONE) ||
00263           (tileh != SLOPE_FLAT && !_settings_game.construction.build_on_slopes)) {
00264         pieces |= MirrorRoadBits(pieces);
00265       }
00266 
00267       /* limit the bits to delete to the existing bits. */
00268       pieces &= present;
00269       if (pieces == ROAD_NONE) return CMD_ERROR;
00270 
00271       /* Now set present what it will be after the remove */
00272       present ^= pieces;
00273 
00274       /* Check for invalid RoadBit combinations on slopes */
00275       if (tileh != SLOPE_FLAT && present != ROAD_NONE &&
00276           (present & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) == present) {
00277         return CMD_ERROR;
00278       }
00279 
00280       if (flags & DC_EXEC) {
00281         if (HasRoadWorks(tile)) {
00282           /* flooding tile with road works, don't forget to remove the effect vehicle too */
00283           assert(_current_company == OWNER_WATER);
00284           EffectVehicle *v;
00285           FOR_ALL_EFFECTVEHICLES(v) {
00286             if (TileVirtXY(v->x_pos, v->y_pos) == tile) {
00287               delete v;
00288             }
00289           }
00290         }
00291         if (present == ROAD_NONE) {
00292           RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));
00293           if (rts == ROADTYPES_NONE) {
00294             /* Includes MarkTileDirtyByTile() */
00295             DoClearSquare(tile);
00296           } else {
00297             if (rt == ROADTYPE_ROAD && IsRoadOwner(tile, ROADTYPE_ROAD, OWNER_TOWN)) {
00298               /* Update nearest-town index */
00299               const Town *town = CalcClosestTownFromTile(tile);
00300               SetTownIndex(tile, town == NULL ? (TownID)INVALID_TOWN : town->index);
00301             }
00302             SetRoadBits(tile, ROAD_NONE, rt);
00303             SetRoadTypes(tile, rts);
00304             MarkTileDirtyByTile(tile);
00305           }
00306         } else {
00307           /* When bits are removed, you *always* end up with something that
00308            * is not a complete straight road tile. However, trams do not have
00309            * onewayness, so they cannot remove it either. */
00310           if (rt != ROADTYPE_TRAM) SetDisallowedRoadDirections(tile, DRD_NONE);
00311           SetRoadBits(tile, present, rt);
00312           MarkTileDirtyByTile(tile);
00313         }
00314       }
00315 
00316       CommandCost cost(EXPENSES_CONSTRUCTION, CountBits(pieces) * _price[PR_CLEAR_ROAD]);
00317       /* If we build a foundation we have to pay for it. */
00318       if (f == FOUNDATION_NONE && GetRoadFoundation(tileh, present) != FOUNDATION_NONE) cost.AddCost(_price[PR_BUILD_FOUNDATION]);
00319 
00320       return cost;
00321     }
00322 
00323     case ROAD_TILE_CROSSING: {
00324       if (pieces & ComplementRoadBits(GetCrossingRoadBits(tile))) {
00325         return CMD_ERROR;
00326       }
00327 
00328       /* Don't allow road to be removed from the crossing when there is tram;
00329        * we can't draw the crossing without roadbits ;) */
00330       if (rt == ROADTYPE_ROAD && HasTileRoadType(tile, ROADTYPE_TRAM) && (flags & DC_EXEC || crossing_check)) return CMD_ERROR;
00331 
00332       if (flags & DC_EXEC) {
00333         Track railtrack = GetCrossingRailTrack(tile);
00334         RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));
00335         if (rts == ROADTYPES_NONE) {
00336           TrackBits tracks = GetCrossingRailBits(tile);
00337           bool reserved = HasCrossingReservation(tile);
00338           MakeRailNormal(tile, GetTileOwner(tile), tracks, GetRailType(tile));
00339           if (reserved) SetTrackReservation(tile, tracks);
00340         } else {
00341           SetRoadTypes(tile, rts);
00342           /* If we ever get HWAY and it is possible without road then we will need to promote ownership and invalidate town index here, too */
00343         }
00344         MarkTileDirtyByTile(tile);
00345         YapfNotifyTrackLayoutChange(tile, railtrack);
00346       }
00347       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_ROAD] * 2);
00348     }
00349 
00350     default:
00351     case ROAD_TILE_DEPOT:
00352       return CMD_ERROR;
00353   }
00354 }
00355 
00356 
00368 static CommandCost CheckRoadSlope(Slope tileh, RoadBits *pieces, RoadBits existing, RoadBits other)
00369 {
00370   /* Remove already build pieces */
00371   CLRBITS(*pieces, existing);
00372 
00373   /* If we can't build anything stop here */
00374   if (*pieces == ROAD_NONE) return CMD_ERROR;
00375 
00376   /* All RoadBit combos are valid on flat land */
00377   if (tileh == SLOPE_FLAT) return CommandCost();
00378 
00379   /* Proceed steep Slopes first to reduce lookup table size */
00380   if (IsSteepSlope(tileh)) {
00381     /* Force straight roads. */
00382     *pieces |= MirrorRoadBits(*pieces);
00383 
00384     /* Use existing as all existing since only straight
00385      * roads are allowed here. */
00386     existing |= other;
00387 
00388     if ((existing == ROAD_NONE || existing == *pieces) && IsStraightRoad(*pieces)) {
00389       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00390     }
00391     return CMD_ERROR;
00392   }
00393 
00394   /* Save the merge of all bits of the current type */
00395   RoadBits type_bits = existing | *pieces;
00396 
00397   /* Roads on slopes */
00398   if (_settings_game.construction.build_on_slopes && (_invalid_tileh_slopes_road[0][tileh] & (other | type_bits)) == ROAD_NONE) {
00399 
00400     /* If we add leveling we've got to pay for it */
00401     if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00402 
00403     return CommandCost();
00404   }
00405 
00406   /* Autocomplete uphill roads */
00407   *pieces |= MirrorRoadBits(*pieces);
00408   type_bits = existing | *pieces;
00409 
00410   /* Uphill roads */
00411   if (IsStraightRoad(type_bits) && (other == type_bits || other == ROAD_NONE) &&
00412       (_invalid_tileh_slopes_road[1][tileh] & (other | type_bits)) == ROAD_NONE) {
00413 
00414     /* Slopes with foundation ? */
00415     if (IsSlopeWithOneCornerRaised(tileh)) {
00416 
00417       /* Prevent build on slopes if it isn't allowed */
00418       if (_settings_game.construction.build_on_slopes) {
00419 
00420         /* If we add foundation we've got to pay for it */
00421         if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00422 
00423         return CommandCost();
00424       }
00425     } else {
00426       if (HasExactlyOneBit(existing) && GetRoadFoundation(tileh, existing) == FOUNDATION_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00427       return CommandCost();
00428     }
00429   }
00430   return CMD_ERROR;
00431 }
00432 
00443 CommandCost CmdBuildRoad(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00444 {
00445   CommandCost cost(EXPENSES_CONSTRUCTION);
00446 
00447   RoadBits existing = ROAD_NONE;
00448   RoadBits other_bits = ROAD_NONE;
00449 
00450   /* Road pieces are max 4 bitset values (NE, NW, SE, SW) and town can only be non-zero
00451    * if a non-company is building the road */
00452   if ((Company::IsValidID(_current_company) && p2 != 0) || (_current_company == OWNER_TOWN && !Town::IsValidID(p2))) return CMD_ERROR;
00453   if (_current_company != OWNER_TOWN) {
00454     const Town *town = CalcClosestTownFromTile(tile);
00455     p2 = (town != NULL) ? town->index : (TownID)INVALID_TOWN;
00456   }
00457 
00458   RoadBits pieces = Extract<RoadBits, 0, 4>(p1);
00459 
00460   /* do not allow building 'zero' road bits, code wouldn't handle it */
00461   if (pieces == ROAD_NONE) return CMD_ERROR;
00462 
00463   RoadType rt = Extract<RoadType, 4, 2>(p1);
00464   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00465 
00466   DisallowedRoadDirections toggle_drd = Extract<DisallowedRoadDirections, 6, 2>(p1);
00467 
00468   Slope tileh = GetTileSlope(tile, NULL);
00469 
00470   bool tile_cleared = false; // Used to remember that the tile was cleared during test run
00471   switch (GetTileType(tile)) {
00472     case MP_ROAD:
00473       switch (GetRoadTileType(tile)) {
00474         case ROAD_TILE_NORMAL: {
00475           if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00476 
00477           other_bits = GetOtherRoadBits(tile, rt);
00478           if (!HasTileRoadType(tile, rt)) break;
00479 
00480           existing = GetRoadBits(tile, rt);
00481           bool crossing = !IsStraightRoad(existing | pieces);
00482           if (rt != ROADTYPE_TRAM && (GetDisallowedRoadDirections(tile) != DRD_NONE || toggle_drd != DRD_NONE) && crossing) {
00483             /* Junctions cannot be one-way */
00484             return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
00485           }
00486           if ((existing & pieces) == pieces) {
00487             /* We only want to set the (dis)allowed road directions */
00488             if (toggle_drd != DRD_NONE && rt != ROADTYPE_TRAM) {
00489               if (crossing) return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
00490 
00491               Owner owner = GetRoadOwner(tile, ROADTYPE_ROAD);
00492               if (owner != OWNER_NONE && !CheckOwnership(owner, tile)) return CMD_ERROR;
00493 
00494               if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00495 
00496               /* Ignore half built tiles */
00497               if ((flags & DC_EXEC) && rt != ROADTYPE_TRAM && IsStraightRoad(existing)) {
00498                 SetDisallowedRoadDirections(tile, GetDisallowedRoadDirections(tile) ^ toggle_drd);
00499                 MarkTileDirtyByTile(tile);
00500               }
00501               return CommandCost();
00502             }
00503             return_cmd_error(STR_ERROR_ALREADY_BUILT);
00504           }
00505         } break;
00506 
00507         case ROAD_TILE_CROSSING:
00508           other_bits = GetCrossingRoadBits(tile);
00509           if (pieces & ComplementRoadBits(other_bits)) goto do_clear;
00510           pieces = other_bits; // we need to pay for both roadbits
00511 
00512           if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00513           break;
00514 
00515         case ROAD_TILE_DEPOT:
00516           if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00517           goto do_clear;
00518 
00519         default: NOT_REACHED();
00520       }
00521       break;
00522 
00523     case MP_RAILWAY: {
00524       if (IsSteepSlope(tileh)) {
00525         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00526       }
00527 
00528       /* Level crossings may only be built on these slopes */
00529       if (!HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh)) {
00530         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00531       }
00532 
00533       if (GetRailTileType(tile) != RAIL_TILE_NORMAL) goto do_clear;
00534 
00535       Axis roaddir;
00536       switch (GetTrackBits(tile)) {
00537         case TRACK_BIT_X:
00538           if (pieces & ROAD_X) goto do_clear;
00539           roaddir = AXIS_Y;
00540           break;
00541 
00542         case TRACK_BIT_Y:
00543           if (pieces & ROAD_Y) goto do_clear;
00544           roaddir = AXIS_X;
00545           break;
00546 
00547         default: goto do_clear;
00548       }
00549 
00550       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00551 
00552       if (flags & DC_EXEC) {
00553         Track railtrack = AxisToTrack(OtherAxis(roaddir));
00554         YapfNotifyTrackLayoutChange(tile, railtrack);
00555         /* Always add road to the roadtypes (can't draw without it) */
00556         bool reserved = HasBit(GetRailReservationTrackBits(tile), railtrack);
00557         MakeRoadCrossing(tile, _current_company, _current_company, GetTileOwner(tile), roaddir, GetRailType(tile), RoadTypeToRoadTypes(rt) | ROADTYPES_ROAD, p2);
00558         SetCrossingReservation(tile, reserved);
00559         UpdateLevelCrossing(tile, false);
00560         MarkTileDirtyByTile(tile);
00561       }
00562       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_ROAD] * (rt == ROADTYPE_ROAD ? 2 : 4));
00563     }
00564 
00565     case MP_STATION: {
00566       if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00567       if (!IsDriveThroughStopTile(tile)) goto do_clear;
00568 
00569       RoadBits curbits = AxisToRoadBits(DiagDirToAxis(GetRoadStopDir(tile)));
00570       if (pieces & ~curbits) goto do_clear;
00571       pieces = curbits; // we need to pay for both roadbits
00572 
00573       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00574     } break;
00575 
00576     case MP_TUNNELBRIDGE:
00577       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) goto do_clear;
00578       if (MirrorRoadBits(DiagDirToRoadBits(GetTunnelBridgeDirection(tile))) != pieces) goto do_clear;
00579       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00580       /* Don't allow adding roadtype to the bridge/tunnel when vehicles are already driving on it */
00581       if (HasVehicleOnTunnelBridge(tile, GetOtherTunnelBridgeEnd(tile))) return CMD_ERROR;
00582       break;
00583 
00584     default: {
00585 do_clear:;
00586       CommandCost ret = DoCommand(tile, 0, 0, flags & ~DC_EXEC, CMD_LANDSCAPE_CLEAR);
00587       if (ret.Failed()) return ret;
00588       cost.AddCost(ret);
00589       tile_cleared = true;
00590     } break;
00591   }
00592 
00593   if (other_bits != pieces) {
00594     /* Check the foundation/slopes when adding road/tram bits */
00595     CommandCost ret = CheckRoadSlope(tileh, &pieces, existing, other_bits);
00596     /* Return an error if we need to build a foundation (ret != 0) but the
00597      * current setting is turned off */
00598     if (ret.Failed() || (ret.GetCost() != 0 && !_settings_game.construction.build_on_slopes)) {
00599       return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00600     }
00601     cost.AddCost(ret);
00602   }
00603 
00604   if (!tile_cleared && IsTileType(tile, MP_ROAD)) {
00605     /* Don't put the pieces that already exist */
00606     pieces &= ComplementRoadBits(existing);
00607 
00608     /* Check if new road bits will have the same foundation as other existing road types */
00609     if (IsNormalRoad(tile)) {
00610       Slope slope = GetTileSlope(tile, NULL);
00611       Foundation found_new = GetRoadFoundation(slope, pieces | existing);
00612 
00613       /* Test if all other roadtypes can be built at that foundation */
00614       for (RoadType rtest = ROADTYPE_ROAD; rtest < ROADTYPE_END; rtest++) {
00615         if (rtest != rt) { // check only other road types
00616           RoadBits bits = GetRoadBits(tile, rtest);
00617           /* do not check if there are not road bits of given type */
00618           if (bits != ROAD_NONE && GetRoadFoundation(slope, bits) != found_new) {
00619             return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00620           }
00621         }
00622       }
00623     }
00624   }
00625 
00626   if (!tile_cleared && !EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00627 
00628   cost.AddCost(CountBits(pieces) * _price[PR_BUILD_ROAD]);
00629   if (!tile_cleared && IsTileType(tile, MP_TUNNELBRIDGE)) {
00630     /* Pay for *every* tile of the bridge or tunnel */
00631     cost.MultiplyCost(GetTunnelBridgeLength(GetOtherTunnelBridgeEnd(tile), tile) + 2);
00632   }
00633 
00634   if (flags & DC_EXEC) {
00635     /* CmdBuildLongRoad calls us directly with DC_EXEC, so we may only clear the tile after all
00636      * fail/success tests have been done. */
00637     if (tile_cleared) DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00638 
00639     switch (GetTileType(tile)) {
00640       case MP_ROAD: {
00641         RoadTileType rtt = GetRoadTileType(tile);
00642         if (existing == ROAD_NONE || rtt == ROAD_TILE_CROSSING) {
00643           SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00644           SetRoadOwner(tile, rt, _current_company);
00645           if (rt == ROADTYPE_ROAD) SetTownIndex(tile, p2);
00646         }
00647         if (rtt != ROAD_TILE_CROSSING) SetRoadBits(tile, existing | pieces, rt);
00648       } break;
00649 
00650       case MP_TUNNELBRIDGE: {
00651         TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
00652 
00653         SetRoadTypes(other_end, GetRoadTypes(other_end) | RoadTypeToRoadTypes(rt));
00654         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00655         SetRoadOwner(other_end, rt, _current_company);
00656         SetRoadOwner(tile, rt, _current_company);
00657 
00658         /* Mark tiles diry that have been repaved */
00659         MarkTileDirtyByTile(other_end);
00660         MarkTileDirtyByTile(tile);
00661         if (IsBridge(tile)) {
00662           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
00663 
00664           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
00665         }
00666       } break;
00667 
00668       case MP_STATION:
00669         assert(IsDriveThroughStopTile(tile));
00670         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00671         SetRoadOwner(tile, rt, _current_company);
00672         break;
00673 
00674       default:
00675         MakeRoadNormal(tile, pieces, RoadTypeToRoadTypes(rt), p2, _current_company, _current_company);
00676         break;
00677     }
00678 
00679     if (rt != ROADTYPE_TRAM && IsNormalRoadTile(tile)) {
00680       existing |= pieces;
00681       SetDisallowedRoadDirections(tile, IsStraightRoad(existing) ?
00682           GetDisallowedRoadDirections(tile) ^ toggle_drd : DRD_NONE);
00683     }
00684 
00685     MarkTileDirtyByTile(tile);
00686   }
00687   return cost;
00688 }
00689 
00704 CommandCost CmdBuildLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00705 {
00706   CommandCost cost(EXPENSES_CONSTRUCTION);
00707   bool had_bridge = false;
00708   bool had_tunnel = false;
00709   bool had_success = false;
00710   DisallowedRoadDirections drd = DRD_NORTHBOUND;
00711 
00712   _error_message = INVALID_STRING_ID;
00713 
00714   if (p1 >= MapSize()) return CMD_ERROR;
00715 
00716   TileIndex end_tile = p1;
00717   RoadType rt = Extract<RoadType, 3, 2>(p2);
00718   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00719 
00720   Axis axis = Extract<Axis, 2, 1>(p2);
00721   /* Only drag in X or Y direction dictated by the direction variable */
00722   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00723   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00724 
00725   DiagDirection dir = AxisToDiagDir(axis);
00726 
00727   /* Swap direction, also the half-tile drag var (bit 0 and 1) */
00728   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00729     dir = ReverseDiagDir(dir);
00730     p2 ^= 3;
00731     drd = DRD_SOUTHBOUND;
00732   }
00733 
00734   /* On the X-axis, we have to swap the initial bits, so they
00735    * will be interpreted correctly in the GTTS. Futhermore
00736    * when you just 'click' on one tile to build them. */
00737   if ((axis == AXIS_Y) == (start_tile == end_tile && HasBit(p2, 0) == HasBit(p2, 1))) drd ^= DRD_BOTH;
00738   /* No disallowed direction bits have to be toggled */
00739   if (!HasBit(p2, 5)) drd = DRD_NONE;
00740 
00741   TileIndex tile = start_tile;
00742   /* Start tile is the first tile clicked by the user. */
00743   for (;;) {
00744     RoadBits bits = AxisToRoadBits(axis);
00745 
00746     /* Road parts only have to be built at the start tile or at the end tile. */
00747     if (tile == end_tile && !HasBit(p2, 1)) bits &= DiagDirToRoadBits(ReverseDiagDir(dir));
00748     if (tile == start_tile && HasBit(p2, 0)) bits &= DiagDirToRoadBits(dir);
00749 
00750     _error_message = INVALID_STRING_ID;
00751     CommandCost ret = DoCommand(tile, drd << 6 | rt << 4 | bits, 0, flags, CMD_BUILD_ROAD);
00752     if (ret.Failed()) {
00753       if (_error_message != STR_ERROR_ALREADY_BUILT) {
00754         if (HasBit(p2, 6)) return CMD_ERROR;
00755         break;
00756       }
00757     } else {
00758       had_success = true;
00759       /* Only pay for the upgrade on one side of the bridges and tunnels */
00760       if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00761         if (IsBridge(tile)) {
00762           if ((!had_bridge || GetTunnelBridgeDirection(tile) == dir)) {
00763             cost.AddCost(ret);
00764           }
00765           had_bridge = true;
00766         } else { // IsTunnel(tile)
00767           if ((!had_tunnel || GetTunnelBridgeDirection(tile) == dir)) {
00768             cost.AddCost(ret);
00769           }
00770           had_tunnel = true;
00771         }
00772       } else {
00773         cost.AddCost(ret);
00774       }
00775     }
00776 
00777     if (tile == end_tile) break;
00778 
00779     tile += TileOffsByDiagDir(dir);
00780   }
00781 
00782   return !had_success ? CMD_ERROR : cost;
00783 }
00784 
00797 CommandCost CmdRemoveLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00798 {
00799   CommandCost cost(EXPENSES_CONSTRUCTION);
00800 
00801   if (p1 >= MapSize()) return CMD_ERROR;
00802 
00803   TileIndex end_tile = p1;
00804   RoadType rt = Extract<RoadType, 3, 2>(p2);
00805   if (!IsValidRoadType(rt)) return CMD_ERROR;
00806 
00807   Axis axis = Extract<Axis, 2, 1>(p2);
00808   /* Only drag in X or Y direction dictated by the direction variable */
00809   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00810   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00811 
00812   /* Swap start and ending tile, also the half-tile drag var (bit 0 and 1) */
00813   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00814     TileIndex t = start_tile;
00815     start_tile = end_tile;
00816     end_tile = t;
00817     p2 ^= IsInsideMM(p2 & 3, 1, 3) ? 3 : 0;
00818   }
00819 
00820   Money money = GetAvailableMoneyForCommand();
00821   TileIndex tile = start_tile;
00822   /* Start tile is the small number. */
00823   for (;;) {
00824     RoadBits bits = AxisToRoadBits(axis);
00825 
00826     if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
00827     if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
00828 
00829     /* try to remove the halves. */
00830     if (bits != 0) {
00831       CommandCost ret = RemoveRoad(tile, flags & ~DC_EXEC, bits, rt, true);
00832       if (ret.Succeeded()) {
00833         if (flags & DC_EXEC) {
00834           money -= ret.GetCost();
00835           if (money < 0) {
00836             _additional_cash_required = DoCommand(start_tile, end_tile, p2, flags & ~DC_EXEC, CMD_REMOVE_LONG_ROAD).GetCost();
00837             return cost;
00838           }
00839           RemoveRoad(tile, flags, bits, rt, true, false);
00840         }
00841         cost.AddCost(ret);
00842       }
00843     }
00844 
00845     if (tile == end_tile) break;
00846 
00847     tile += (axis == AXIS_Y) ? TileDiffXY(0, 1) : TileDiffXY(1, 0);
00848   }
00849 
00850   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
00851 }
00852 
00865 CommandCost CmdBuildRoadDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00866 {
00867   DiagDirection dir = Extract<DiagDirection, 0, 2>(p1);
00868   RoadType rt = Extract<RoadType, 2, 2>(p1);
00869 
00870   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00871 
00872   Slope tileh = GetTileSlope(tile, NULL);
00873   if (tileh != SLOPE_FLAT && (
00874         !_settings_game.construction.build_on_slopes ||
00875         IsSteepSlope(tileh) ||
00876         !CanBuildDepotByTileh(dir, tileh)
00877       )) {
00878     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00879   }
00880 
00881   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00882   if (cost.Failed()) return CMD_ERROR;
00883 
00884   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
00885 
00886   if (!Depot::CanAllocateItem()) return CMD_ERROR;
00887 
00888   if (flags & DC_EXEC) {
00889     Depot *dep = new Depot(tile);
00890     dep->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
00891 
00892     MakeRoadDepot(tile, _current_company, dep->index, dir, rt);
00893     MarkTileDirtyByTile(tile);
00894   }
00895   cost.AddCost(_price[PR_BUILD_DEPOT_ROAD]);
00896   return cost;
00897 }
00898 
00899 static CommandCost RemoveRoadDepot(TileIndex tile, DoCommandFlag flags)
00900 {
00901   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER) return CMD_ERROR;
00902 
00903   if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00904 
00905   if (flags & DC_EXEC) {
00906     delete Depot::GetByTile(tile);
00907     DoClearSquare(tile);
00908   }
00909 
00910   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_ROAD]);
00911 }
00912 
00913 static CommandCost ClearTile_Road(TileIndex tile, DoCommandFlag flags)
00914 {
00915   switch (GetRoadTileType(tile)) {
00916     case ROAD_TILE_NORMAL: {
00917       RoadBits b = GetAllRoadBits(tile);
00918 
00919       /* Clear the road if only one piece is on the tile OR we are not using the DC_AUTO flag */
00920       if ((HasExactlyOneBit(b) && GetRoadBits(tile, ROADTYPE_TRAM) == ROAD_NONE) || !(flags & DC_AUTO)) {
00921         RoadTypes rts = GetRoadTypes(tile);
00922         CommandCost ret(EXPENSES_CONSTRUCTION);
00923         for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
00924           if (HasBit(rts, rt)) {
00925             CommandCost tmp_ret = RemoveRoad(tile, flags, GetRoadBits(tile, rt), rt, true);
00926             if (tmp_ret.Failed()) return tmp_ret;
00927             ret.AddCost(tmp_ret);
00928           }
00929         }
00930         return ret;
00931       }
00932       return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
00933     }
00934 
00935     case ROAD_TILE_CROSSING: {
00936       RoadTypes rts = GetRoadTypes(tile);
00937       CommandCost ret(EXPENSES_CONSTRUCTION);
00938 
00939       if (flags & DC_AUTO) return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
00940 
00941       /* Must iterate over the roadtypes in a reverse manner because
00942        * tram tracks must be removed before the road bits. */
00943       RoadType rt = ROADTYPE_TRAM;
00944       do {
00945         if (HasBit(rts, rt)) {
00946           CommandCost tmp_ret = RemoveRoad(tile, flags, GetCrossingRoadBits(tile), rt, false);
00947           if (tmp_ret.Failed()) return tmp_ret;
00948           ret.AddCost(tmp_ret);
00949         }
00950       } while (rt-- != ROADTYPE_ROAD);
00951 
00952       if (flags & DC_EXEC) {
00953         DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00954       }
00955       return ret;
00956     }
00957 
00958     default:
00959     case ROAD_TILE_DEPOT:
00960       if (flags & DC_AUTO) {
00961         return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
00962       }
00963       return RemoveRoadDepot(tile, flags);
00964   }
00965 }
00966 
00967 
00968 struct DrawRoadTileStruct {
00969   uint16 image;
00970   byte subcoord_x;
00971   byte subcoord_y;
00972 };
00973 
00974 #include "table/road_land.h"
00975 
00983 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits)
00984 {
00985   /* Flat land and land without a road doesn't require a foundation */
00986   if (tileh == SLOPE_FLAT || bits == ROAD_NONE) return FOUNDATION_NONE;
00987 
00988   if (!IsSteepSlope(tileh)) {
00989     /* Leveled RoadBits on a slope */
00990     if ((_invalid_tileh_slopes_road[0][tileh] & bits) == ROAD_NONE) return FOUNDATION_LEVELED;
00991 
00992     /* Straight roads without foundation on a slope */
00993     if (!IsSlopeWithOneCornerRaised(tileh) &&
00994         (_invalid_tileh_slopes_road[1][tileh] & bits) == ROAD_NONE)
00995       return FOUNDATION_NONE;
00996   }
00997 
00998   /* Roads on steep Slopes or on Slopes with one corner raised */
00999   return (bits == ROAD_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
01000 }
01001 
01002 const byte _road_sloped_sprites[14] = {
01003   0,  0,  2,  0,
01004   0,  1,  0,  0,
01005   3,  0,  0,  0,
01006   0,  0
01007 };
01008 
01019 static bool AlwaysDrawUnpavedRoads(TileIndex tile, Roadside roadside)
01020 {
01021   return (IsOnSnow(tile) &&
01022       !(_settings_game.game_creation.landscape == LT_TROPIC && HasGrfMiscBit(GMB_DESERT_PAVED_ROADS) &&
01023         roadside != ROADSIDE_BARREN && roadside != ROADSIDE_GRASS && roadside != ROADSIDE_GRASS_ROAD_WORKS));
01024 }
01025 
01031 void DrawTramCatenary(const TileInfo *ti, RoadBits tram)
01032 {
01033   /* Do not draw catenary if it is invisible */
01034   if (IsInvisibilitySet(TO_CATENARY)) return;
01035 
01036   /* Don't draw the catenary under a low bridge */
01037   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_CATENARY)) {
01038     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01039 
01040     if (height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) return;
01041   }
01042 
01043   SpriteID front;
01044   SpriteID back;
01045 
01046   if (ti->tileh != SLOPE_FLAT) {
01047     back  = SPR_TRAMWAY_BACK_WIRES_SLOPED  + _road_sloped_sprites[ti->tileh - 1];
01048     front = SPR_TRAMWAY_FRONT_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
01049   } else {
01050     back  = SPR_TRAMWAY_BASE + _road_backpole_sprites_1[tram];
01051     front = SPR_TRAMWAY_BASE + _road_frontwire_sprites_1[tram];
01052   }
01053 
01054   AddSortableSpriteToDraw(back,  PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01055   AddSortableSpriteToDraw(front, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01056 }
01057 
01066 static void DrawRoadDetail(SpriteID img, const TileInfo *ti, int dx, int dy, int h)
01067 {
01068   int x = ti->x | dx;
01069   int y = ti->y | dy;
01070   byte z = ti->z;
01071   if (ti->tileh != SLOPE_FLAT) z = GetSlopeZ(x, y);
01072   AddSortableSpriteToDraw(img, PAL_NONE, x, y, 2, 2, h, z);
01073 }
01074 
01079 static void DrawRoadBits(TileInfo *ti)
01080 {
01081   RoadBits road = GetRoadBits(ti->tile, ROADTYPE_ROAD);
01082   RoadBits tram = GetRoadBits(ti->tile, ROADTYPE_TRAM);
01083 
01084   SpriteID image = 0;
01085   PaletteID pal = PAL_NONE;
01086 
01087   if (ti->tileh != SLOPE_FLAT) {
01088     DrawFoundation(ti, GetRoadFoundation(ti->tileh, road | tram));
01089 
01090     /* DrawFoundation() modifies ti.
01091      * Default sloped sprites.. */
01092     if (ti->tileh != SLOPE_FLAT) image = _road_sloped_sprites[ti->tileh - 1] + 0x53F;
01093   }
01094 
01095   if (image == 0) image = _road_tile_sprites_1[road != ROAD_NONE ? road : tram];
01096 
01097   Roadside roadside = GetRoadside(ti->tile);
01098 
01099   if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01100     image += 19;
01101   } else {
01102     switch (roadside) {
01103       case ROADSIDE_BARREN:           pal = PALETTE_TO_BARE_LAND; break;
01104       case ROADSIDE_GRASS:            break;
01105       case ROADSIDE_GRASS_ROAD_WORKS: break;
01106       default:                        image -= 19; break; // Paved
01107     }
01108   }
01109 
01110   DrawGroundSprite(image, pal);
01111 
01112   /* For tram we overlay the road graphics with either tram tracks only
01113    * (when there is actual road beneath the trams) or with tram tracks
01114    * and some dirts which hides the road graphics */
01115   if (tram != ROAD_NONE) {
01116     if (ti->tileh != SLOPE_FLAT) {
01117       image = _road_sloped_sprites[ti->tileh - 1] + SPR_TRAMWAY_SLOPED_OFFSET;
01118     } else {
01119       image = _road_tile_sprites_1[tram] - SPR_ROAD_Y;
01120     }
01121     image += (road == ROAD_NONE) ? SPR_TRAMWAY_TRAM : SPR_TRAMWAY_OVERLAY;
01122     DrawGroundSprite(image, pal);
01123   }
01124 
01125   if (road != ROAD_NONE) {
01126     DisallowedRoadDirections drd = GetDisallowedRoadDirections(ti->tile);
01127     if (drd != DRD_NONE) {
01128       DrawGroundSpriteAt(SPR_ONEWAY_BASE + drd - 1 + ((road == ROAD_X) ? 0 : 3), PAL_NONE, 8, 8, GetPartialZ(8, 8, ti->tileh));
01129     }
01130   }
01131 
01132   if (HasRoadWorks(ti->tile)) {
01133     /* Road works */
01134     DrawGroundSprite((road | tram) & ROAD_X ? SPR_EXCAVATION_X : SPR_EXCAVATION_Y, PAL_NONE);
01135     return;
01136   }
01137 
01138   if (tram != ROAD_NONE) DrawTramCatenary(ti, tram);
01139 
01140   /* Return if full detail is disabled, or we are zoomed fully out. */
01141   if (!HasBit(_display_opt, DO_FULL_DETAIL) || _cur_dpi->zoom > ZOOM_LVL_DETAIL) return;
01142 
01143   /* Do not draw details (street lights, trees) under low bridge */
01144   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && (roadside == ROADSIDE_TREES || roadside == ROADSIDE_STREET_LIGHTS)) {
01145     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01146     uint minz = GetTileMaxZ(ti->tile) + 2 * TILE_HEIGHT;
01147 
01148     if (roadside == ROADSIDE_TREES) minz += TILE_HEIGHT;
01149 
01150     if (height < minz) return;
01151   }
01152 
01153   /* If there are no road bits, return, as there is nothing left to do */
01154   if (HasAtMostOneBit(road)) return;
01155 
01156   /* Draw extra details. */
01157   for (const DrawRoadTileStruct *drts = _road_display_table[roadside][road | tram]; drts->image != 0; drts++) {
01158     DrawRoadDetail(drts->image, ti, drts->subcoord_x, drts->subcoord_y, 0x10);
01159   }
01160 }
01161 
01163 static void DrawTile_Road(TileInfo *ti)
01164 {
01165   switch (GetRoadTileType(ti->tile)) {
01166     case ROAD_TILE_NORMAL:
01167       DrawRoadBits(ti);
01168       break;
01169 
01170     case ROAD_TILE_CROSSING: {
01171       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01172 
01173       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
01174 
01175       if (rti->UsesOverlay()) {
01176         Axis axis = GetCrossingRailAxis(ti->tile);
01177         SpriteID road = SPR_ROAD_Y + axis;
01178         PaletteID pal = PAL_NONE;
01179 
01180         Roadside roadside = GetRoadside(ti->tile);
01181 
01182         if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01183           road += 19;
01184         } else {
01185           switch (roadside) {
01186             case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
01187             case ROADSIDE_GRASS:  break;
01188             default:              road -= 19; break; // Paved
01189           }
01190         }
01191 
01192         DrawGroundSprite(road, pal);
01193 
01194         SpriteID rail = GetCustomRailSprite(rti, ti->tile, RTSG_CROSSING) + axis;
01195         DrawGroundSprite(rail, PAL_NONE);
01196         DrawRailTileSeq(ti, &_crossing_layout, TO_CATENARY, rail, 0, PAL_NONE);
01197 
01198         if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01199         break;
01200       }
01201 
01202       SpriteID image = rti->base_sprites.crossing;
01203       PaletteID pal = PAL_NONE;
01204 
01205       if (GetCrossingRoadAxis(ti->tile) == AXIS_X) image++;
01206       if (IsCrossingBarred(ti->tile)) image += 2;
01207 
01208       Roadside roadside = GetRoadside(ti->tile);
01209 
01210       if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01211         image += 8;
01212       } else {
01213         switch (roadside) {
01214           case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
01215           case ROADSIDE_GRASS:  break;
01216           default:              image += 4; break; // Paved
01217         }
01218       }
01219 
01220       DrawGroundSprite(image, pal);
01221 
01222       /* PBS debugging, draw reserved tracks darker */
01223       if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) {
01224         DrawGroundSprite(GetCrossingRoadAxis(ti->tile) == AXIS_Y ? GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_x : GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_y, PALETTE_CRASH);
01225       }
01226 
01227       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01228         DrawGroundSprite(SPR_TRAMWAY_OVERLAY + (GetCrossingRoadAxis(ti->tile) ^ 1), pal);
01229         DrawTramCatenary(ti, GetCrossingRoadBits(ti->tile));
01230       }
01231       if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01232       break;
01233     }
01234 
01235     default:
01236     case ROAD_TILE_DEPOT: {
01237       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01238 
01239       PaletteID palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
01240 
01241       const DrawTileSprites *dts;
01242       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01243         dts =  &_tram_depot[GetRoadDepotDirection(ti->tile)];
01244       } else {
01245         dts =  &_road_depot[GetRoadDepotDirection(ti->tile)];
01246       }
01247 
01248       DrawGroundSprite(dts->ground.sprite, PAL_NONE);
01249       DrawOrigTileSeq(ti, dts, TO_BUILDINGS, palette);
01250       break;
01251     }
01252   }
01253   DrawBridgeMiddle(ti);
01254 }
01255 
01256 void DrawRoadDepotSprite(int x, int y, DiagDirection dir, RoadType rt)
01257 {
01258   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
01259   const DrawTileSprites *dts = (rt == ROADTYPE_TRAM) ? &_tram_depot[dir] : &_road_depot[dir];
01260 
01261   x += 33;
01262   y += 17;
01263 
01264   DrawSprite(dts->ground.sprite, PAL_NONE, x, y);
01265   DrawOrigTileSeqInGUI(x, y, dts, palette);
01266 }
01267 
01273 void UpdateNearestTownForRoadTiles(bool invalidate)
01274 {
01275   assert(!invalidate || _generating_world);
01276 
01277   for (TileIndex t = 0; t < MapSize(); t++) {
01278     if (IsTileType(t, MP_ROAD) && !IsRoadDepot(t) && !HasTownOwnedRoad(t)) {
01279       TownID tid = (TownID)INVALID_TOWN;
01280       if (!invalidate) {
01281         const Town *town = CalcClosestTownFromTile(t);
01282         if (town != NULL) tid = town->index;
01283       }
01284       SetTownIndex(t, tid);
01285     }
01286   }
01287 }
01288 
01289 static uint GetSlopeZ_Road(TileIndex tile, uint x, uint y)
01290 {
01291   uint z;
01292   Slope tileh = GetTileSlope(tile, &z);
01293 
01294   if (tileh == SLOPE_FLAT) return z;
01295   if (IsNormalRoad(tile)) {
01296     Foundation f = GetRoadFoundation(tileh, GetAllRoadBits(tile));
01297     z += ApplyFoundationToSlope(f, &tileh);
01298     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
01299   } else {
01300     return z + TILE_HEIGHT;
01301   }
01302 }
01303 
01304 static Foundation GetFoundation_Road(TileIndex tile, Slope tileh)
01305 {
01306   if (IsNormalRoad(tile)) {
01307     return GetRoadFoundation(tileh, GetAllRoadBits(tile));
01308   } else {
01309     return FlatteningFoundation(tileh);
01310   }
01311 }
01312 
01313 static const Roadside _town_road_types[][2] = {
01314   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01315   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01316   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01317   { ROADSIDE_TREES,         ROADSIDE_TREES },
01318   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01319 };
01320 
01321 static const Roadside _town_road_types_2[][2] = {
01322   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01323   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01324   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01325   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01326   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01327 };
01328 
01329 
01330 static void TileLoop_Road(TileIndex tile)
01331 {
01332   switch (_settings_game.game_creation.landscape) {
01333     case LT_ARCTIC:
01334       if (IsOnSnow(tile) != (GetTileZ(tile) > GetSnowLine())) {
01335         ToggleSnow(tile);
01336         MarkTileDirtyByTile(tile);
01337       }
01338       break;
01339 
01340     case LT_TROPIC:
01341       if (GetTropicZone(tile) == TROPICZONE_DESERT && !IsOnDesert(tile)) {
01342         ToggleDesert(tile);
01343         MarkTileDirtyByTile(tile);
01344       }
01345       break;
01346   }
01347 
01348   if (IsRoadDepot(tile)) return;
01349 
01350   const Town *t = ClosestTownFromTile(tile, UINT_MAX);
01351   if (!HasRoadWorks(tile)) {
01352     HouseZonesBits grp = HZB_TOWN_EDGE;
01353 
01354     if (t != NULL) {
01355       grp = GetTownRadiusGroup(t, tile);
01356 
01357       /* Show an animation to indicate road work */
01358       if (t->road_build_months != 0 &&
01359           (DistanceManhattan(t->xy, tile) < 8 || grp != HZB_TOWN_EDGE) &&
01360           IsNormalRoad(tile) && !HasAtMostOneBit(GetAllRoadBits(tile))) {
01361         if (GetFoundationSlope(tile, NULL) == SLOPE_FLAT && EnsureNoVehicleOnGround(tile) && Chance16(1, 40)) {
01362           StartRoadWorks(tile);
01363 
01364           SndPlayTileFx(SND_21_JACKHAMMER, tile);
01365           CreateEffectVehicleAbove(
01366             TileX(tile) * TILE_SIZE + 7,
01367             TileY(tile) * TILE_SIZE + 7,
01368             0,
01369             EV_BULLDOZER);
01370           MarkTileDirtyByTile(tile);
01371           return;
01372         }
01373       }
01374     }
01375 
01376     {
01377       /* Adjust road ground type depending on 'grp' (grp is the distance to the center) */
01378       const Roadside *new_rs = (_settings_game.game_creation.landscape == LT_TOYLAND) ? _town_road_types_2[grp] : _town_road_types[grp];
01379       Roadside cur_rs = GetRoadside(tile);
01380 
01381       /* We have our desired type, do nothing */
01382       if (cur_rs == new_rs[0]) return;
01383 
01384       /* We have the pre-type of the desired type, switch to the desired type */
01385       if (cur_rs == new_rs[1]) {
01386         cur_rs = new_rs[0];
01387       /* We have barren land, install the pre-type */
01388       } else if (cur_rs == ROADSIDE_BARREN) {
01389         cur_rs = new_rs[1];
01390       /* We're totally off limits, remove any installation and make barren land */
01391       } else {
01392         cur_rs = ROADSIDE_BARREN;
01393       }
01394       SetRoadside(tile, cur_rs);
01395       MarkTileDirtyByTile(tile);
01396     }
01397   } else if (IncreaseRoadWorksCounter(tile)) {
01398     TerminateRoadWorks(tile);
01399 
01400     if (_settings_game.economy.mod_road_rebuild) {
01401       /* Generate a nicer town surface */
01402       const RoadBits old_rb = GetAnyRoadBits(tile, ROADTYPE_ROAD);
01403       const RoadBits new_rb = CleanUpRoadBits(tile, old_rb);
01404 
01405       if (old_rb != new_rb) {
01406         RemoveRoad(tile, DC_EXEC | DC_AUTO | DC_NO_WATER, (old_rb ^ new_rb), ROADTYPE_ROAD, true);
01407       }
01408     }
01409 
01410     MarkTileDirtyByTile(tile);
01411   }
01412 }
01413 
01414 static bool ClickTile_Road(TileIndex tile)
01415 {
01416   if (!IsRoadDepot(tile)) return false;
01417 
01418   ShowDepotWindow(tile, VEH_ROAD);
01419   return true;
01420 }
01421 
01422 /* Converts RoadBits to TrackBits */
01423 static const byte _road_trackbits[16] = {
01424   0x0, 0x0, 0x0, 0x10, 0x0, 0x2, 0x8, 0x1A, 0x0, 0x4, 0x1, 0x15, 0x20, 0x26, 0x29, 0x3F,
01425 };
01426 
01427 static TrackStatus GetTileTrackStatus_Road(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
01428 {
01429   TrackdirBits trackdirbits = TRACKDIR_BIT_NONE;
01430   TrackdirBits red_signals = TRACKDIR_BIT_NONE; // crossing barred
01431   switch (mode) {
01432     case TRANSPORT_RAIL:
01433       if (IsLevelCrossing(tile)) trackdirbits = TrackBitsToTrackdirBits(GetCrossingRailBits(tile));
01434       break;
01435 
01436     case TRANSPORT_ROAD:
01437       if ((GetRoadTypes(tile) & sub_mode) == 0) break;
01438       switch (GetRoadTileType(tile)) {
01439         case ROAD_TILE_NORMAL: {
01440           const uint drd_to_multiplier[DRD_END] = { 0x101, 0x100, 0x1, 0x0 };
01441           RoadType rt = (RoadType)FindFirstBit(sub_mode);
01442           RoadBits bits = GetRoadBits(tile, rt);
01443 
01444           /* no roadbit at this side of tile, return 0 */
01445           if (side != INVALID_DIAGDIR && (DiagDirToRoadBits(side) & bits) == 0) break;
01446 
01447           uint multiplier = drd_to_multiplier[rt == ROADTYPE_TRAM ? DRD_NONE : GetDisallowedRoadDirections(tile)];
01448           if (!HasRoadWorks(tile)) trackdirbits = (TrackdirBits)(_road_trackbits[bits] * multiplier);
01449           break;
01450         }
01451 
01452         case ROAD_TILE_CROSSING: {
01453           Axis axis = GetCrossingRoadAxis(tile);
01454 
01455           if (side != INVALID_DIAGDIR && axis != DiagDirToAxis(side)) break;
01456 
01457           trackdirbits = TrackBitsToTrackdirBits(AxisToTrackBits(axis));
01458           if (IsCrossingBarred(tile)) red_signals = trackdirbits;
01459           break;
01460         }
01461 
01462         default:
01463         case ROAD_TILE_DEPOT: {
01464           DiagDirection dir = GetRoadDepotDirection(tile);
01465 
01466           if (side != INVALID_DIAGDIR && side != dir) break;
01467 
01468           trackdirbits = TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir));
01469           break;
01470         }
01471       }
01472       break;
01473 
01474     default: break;
01475   }
01476   return CombineTrackStatus(trackdirbits, red_signals);
01477 }
01478 
01479 static const StringID _road_tile_strings[] = {
01480   STR_LAI_ROAD_DESCRIPTION_ROAD,
01481   STR_LAI_ROAD_DESCRIPTION_ROAD,
01482   STR_LAI_ROAD_DESCRIPTION_ROAD,
01483   STR_LAI_ROAD_DESCRIPTION_ROAD_WITH_STREETLIGHTS,
01484   STR_LAI_ROAD_DESCRIPTION_ROAD,
01485   STR_LAI_ROAD_DESCRIPTION_TREE_LINED_ROAD,
01486   STR_LAI_ROAD_DESCRIPTION_ROAD,
01487   STR_LAI_ROAD_DESCRIPTION_ROAD,
01488 };
01489 
01490 static void GetTileDesc_Road(TileIndex tile, TileDesc *td)
01491 {
01492   Owner rail_owner = INVALID_OWNER;
01493   Owner road_owner = INVALID_OWNER;
01494   Owner tram_owner = INVALID_OWNER;
01495 
01496   switch (GetRoadTileType(tile)) {
01497     case ROAD_TILE_CROSSING: {
01498       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_RAIL_LEVEL_CROSSING;
01499       RoadTypes rts = GetRoadTypes(tile);
01500       rail_owner = GetTileOwner(tile);
01501       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01502       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01503 
01504       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
01505       td->rail_speed = rti->max_speed;
01506 
01507       break;
01508     }
01509 
01510     case ROAD_TILE_DEPOT:
01511       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_VEHICLE_DEPOT;
01512       road_owner = GetTileOwner(tile); // Tile has only one owner, roadtype does not matter
01513       break;
01514 
01515     default: {
01516       RoadTypes rts = GetRoadTypes(tile);
01517       td->str = (HasBit(rts, ROADTYPE_ROAD) ? _road_tile_strings[GetRoadside(tile)] : STR_LAI_ROAD_DESCRIPTION_TRAMWAY);
01518       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01519       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01520       break;
01521     }
01522   }
01523 
01524   /* Now we have to discover, if the tile has only one owner or many:
01525    *   - Find a first_owner of the tile. (Currently road or tram must be present, but this will break when the third type becomes available)
01526    *   - Compare the found owner with the other owners, and test if they differ.
01527    * Note: If road exists it will be the first_owner.
01528    */
01529   Owner first_owner = (road_owner == INVALID_OWNER ? tram_owner : road_owner);
01530   bool mixed_owners = (tram_owner != INVALID_OWNER && tram_owner != first_owner) || (rail_owner != INVALID_OWNER && rail_owner != first_owner);
01531 
01532   if (mixed_owners) {
01533     /* Multiple owners */
01534     td->owner_type[0] = (rail_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_RAIL_OWNER);
01535     td->owner[0] = rail_owner;
01536     td->owner_type[1] = (road_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_ROAD_OWNER);
01537     td->owner[1] = road_owner;
01538     td->owner_type[2] = (tram_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_TRAM_OWNER);
01539     td->owner[2] = tram_owner;
01540   } else {
01541     /* One to rule them all */
01542     td->owner[0] = first_owner;
01543   }
01544 }
01545 
01550 static const byte _roadveh_enter_depot_dir[4] = {
01551   TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE
01552 };
01553 
01554 static VehicleEnterTileStatus VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
01555 {
01556   switch (GetRoadTileType(tile)) {
01557     case ROAD_TILE_DEPOT: {
01558       if (v->type != VEH_ROAD) break;
01559 
01560       RoadVehicle *rv = RoadVehicle::From(v);
01561       if (rv->frame == RVC_DEPOT_STOP_FRAME &&
01562           _roadveh_enter_depot_dir[GetRoadDepotDirection(tile)] == rv->state) {
01563         rv->state = RVSB_IN_DEPOT;
01564         rv->vehstatus |= VS_HIDDEN;
01565         rv->direction = ReverseDir(rv->direction);
01566         if (rv->Next() == NULL) VehicleEnterDepot(rv->First());
01567         rv->tile = tile;
01568 
01569         InvalidateWindowData(WC_VEHICLE_DEPOT, rv->tile);
01570         return VETSB_ENTERED_WORMHOLE;
01571       }
01572     } break;
01573 
01574     default: break;
01575   }
01576   return VETSB_CONTINUE;
01577 }
01578 
01579 
01580 static void ChangeTileOwner_Road(TileIndex tile, Owner old_owner, Owner new_owner)
01581 {
01582   if (IsRoadDepot(tile)) {
01583     if (GetTileOwner(tile) == old_owner) {
01584       if (new_owner == INVALID_OWNER) {
01585         DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
01586       } else {
01587         SetTileOwner(tile, new_owner);
01588       }
01589     }
01590     return;
01591   }
01592 
01593   for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
01594     /* Update all roadtypes, no matter if they are present */
01595     if (GetRoadOwner(tile, rt) == old_owner) {
01596       SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
01597     }
01598   }
01599 
01600   if (IsLevelCrossing(tile)) {
01601     if (GetTileOwner(tile) == old_owner) {
01602       if (new_owner == INVALID_OWNER) {
01603         DoCommand(tile, 0, GetCrossingRailTrack(tile), DC_EXEC | DC_BANKRUPT, CMD_REMOVE_SINGLE_RAIL);
01604       } else {
01605         SetTileOwner(tile, new_owner);
01606       }
01607     }
01608   }
01609 }
01610 
01611 static CommandCost TerraformTile_Road(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
01612 {
01613   if (_settings_game.construction.build_on_slopes && AutoslopeEnabled()) {
01614     switch (GetRoadTileType(tile)) {
01615       case ROAD_TILE_CROSSING:
01616         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]);
01617         break;
01618 
01619       case ROAD_TILE_DEPOT:
01620         if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRoadDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01621         break;
01622 
01623       case ROAD_TILE_NORMAL: {
01624         RoadBits bits = GetAllRoadBits(tile);
01625         RoadBits bits_copy = bits;
01626         /* Check if the slope-road_bits combination is valid at all, i.e. it is safe to call GetRoadFoundation(). */
01627         if (CheckRoadSlope(tileh_new, &bits_copy, ROAD_NONE, ROAD_NONE).Succeeded()) {
01628           /* CheckRoadSlope() sometimes changes the road_bits, if it does not agree with them. */
01629           if (bits == bits_copy) {
01630             uint z_old;
01631             Slope tileh_old = GetTileSlope(tile, &z_old);
01632 
01633             /* Get the slope on top of the foundation */
01634             z_old += ApplyFoundationToSlope(GetRoadFoundation(tileh_old, bits), &tileh_old);
01635             z_new += ApplyFoundationToSlope(GetRoadFoundation(tileh_new, bits), &tileh_new);
01636 
01637             /* The surface slope must not be changed */
01638             if ((z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01639           }
01640         }
01641         break;
01642       }
01643 
01644       default: NOT_REACHED();
01645     }
01646   }
01647 
01648   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
01649 }
01650 
01652 extern const TileTypeProcs _tile_type_road_procs = {
01653   DrawTile_Road,           // draw_tile_proc
01654   GetSlopeZ_Road,          // get_slope_z_proc
01655   ClearTile_Road,          // clear_tile_proc
01656   NULL,                    // add_accepted_cargo_proc
01657   GetTileDesc_Road,        // get_tile_desc_proc
01658   GetTileTrackStatus_Road, // get_tile_track_status_proc
01659   ClickTile_Road,          // click_tile_proc
01660   NULL,                    // animate_tile_proc
01661   TileLoop_Road,           // tile_loop_clear
01662   ChangeTileOwner_Road,    // change_tile_owner_clear
01663   NULL,                    // add_produced_cargo_proc
01664   VehicleEnter_Road,       // vehicle_enter_tile_proc
01665   GetFoundation_Road,      // get_foundation_proc
01666   TerraformTile_Road,      // terraform_tile_proc
01667 };

Generated on Fri Apr 30 21:55:24 2010 for OpenTTD by  doxygen 1.6.1