road_cmd.cpp

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00001 /* $Id: road_cmd.cpp 20429 2010-08-09 21:38:18Z 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               DisallowedRoadDirections dis_existing = GetDisallowedRoadDirections(tile);
00495               DisallowedRoadDirections dis_new      = dis_existing ^ toggle_drd;
00496 
00497               /* We allow removing disallowed directions to break up
00498                * deadlocks, but adding them can break articulated
00499                * vehicles. As such, only when less is disallowed,
00500                * i.e. bits are removed, we skip the vehicle check. */
00501               if (CountBits(dis_existing) <= CountBits(dis_new)) {
00502                 if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00503               }
00504 
00505               /* Ignore half built tiles */
00506               if ((flags & DC_EXEC) && rt != ROADTYPE_TRAM && IsStraightRoad(existing)) {
00507                 SetDisallowedRoadDirections(tile, dis_new);
00508                 MarkTileDirtyByTile(tile);
00509               }
00510               return CommandCost();
00511             }
00512             return_cmd_error(STR_ERROR_ALREADY_BUILT);
00513           }
00514         } break;
00515 
00516         case ROAD_TILE_CROSSING:
00517           other_bits = GetCrossingRoadBits(tile);
00518           if (pieces & ComplementRoadBits(other_bits)) goto do_clear;
00519           pieces = other_bits; // we need to pay for both roadbits
00520 
00521           if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00522           break;
00523 
00524         case ROAD_TILE_DEPOT:
00525           if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00526           goto do_clear;
00527 
00528         default: NOT_REACHED();
00529       }
00530       break;
00531 
00532     case MP_RAILWAY: {
00533       if (IsSteepSlope(tileh)) {
00534         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00535       }
00536 
00537       /* Level crossings may only be built on these slopes */
00538       if (!HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh)) {
00539         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00540       }
00541 
00542       if (GetRailTileType(tile) != RAIL_TILE_NORMAL) goto do_clear;
00543 
00544       if (RailNoLevelCrossings(GetRailType(tile))) {
00545         return_cmd_error(STR_ERROR_CROSSING_DISALLOWED);
00546       }
00547 
00548       Axis roaddir;
00549       switch (GetTrackBits(tile)) {
00550         case TRACK_BIT_X:
00551           if (pieces & ROAD_X) goto do_clear;
00552           roaddir = AXIS_Y;
00553           break;
00554 
00555         case TRACK_BIT_Y:
00556           if (pieces & ROAD_Y) goto do_clear;
00557           roaddir = AXIS_X;
00558           break;
00559 
00560         default: goto do_clear;
00561       }
00562 
00563       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00564 
00565       if (flags & DC_EXEC) {
00566         Track railtrack = AxisToTrack(OtherAxis(roaddir));
00567         YapfNotifyTrackLayoutChange(tile, railtrack);
00568         /* Always add road to the roadtypes (can't draw without it) */
00569         bool reserved = HasBit(GetRailReservationTrackBits(tile), railtrack);
00570         MakeRoadCrossing(tile, _current_company, _current_company, GetTileOwner(tile), roaddir, GetRailType(tile), RoadTypeToRoadTypes(rt) | ROADTYPES_ROAD, p2);
00571         SetCrossingReservation(tile, reserved);
00572         UpdateLevelCrossing(tile, false);
00573         MarkTileDirtyByTile(tile);
00574       }
00575       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_ROAD] * (rt == ROADTYPE_ROAD ? 2 : 4));
00576     }
00577 
00578     case MP_STATION: {
00579       if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00580       if (!IsDriveThroughStopTile(tile)) goto do_clear;
00581 
00582       RoadBits curbits = AxisToRoadBits(DiagDirToAxis(GetRoadStopDir(tile)));
00583       if (pieces & ~curbits) goto do_clear;
00584       pieces = curbits; // we need to pay for both roadbits
00585 
00586       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00587     } break;
00588 
00589     case MP_TUNNELBRIDGE:
00590       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) goto do_clear;
00591       if (MirrorRoadBits(DiagDirToRoadBits(GetTunnelBridgeDirection(tile))) != pieces) goto do_clear;
00592       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00593       /* Don't allow adding roadtype to the bridge/tunnel when vehicles are already driving on it */
00594       if (HasVehicleOnTunnelBridge(tile, GetOtherTunnelBridgeEnd(tile))) return CMD_ERROR;
00595       break;
00596 
00597     default: {
00598 do_clear:;
00599       CommandCost ret = DoCommand(tile, 0, 0, flags & ~DC_EXEC, CMD_LANDSCAPE_CLEAR);
00600       if (ret.Failed()) return ret;
00601       cost.AddCost(ret);
00602       tile_cleared = true;
00603     } break;
00604   }
00605 
00606   if (other_bits != pieces) {
00607     /* Check the foundation/slopes when adding road/tram bits */
00608     CommandCost ret = CheckRoadSlope(tileh, &pieces, existing, other_bits);
00609     /* Return an error if we need to build a foundation (ret != 0) but the
00610      * current setting is turned off */
00611     if (ret.Failed() || (ret.GetCost() != 0 && !_settings_game.construction.build_on_slopes)) {
00612       return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00613     }
00614     cost.AddCost(ret);
00615   }
00616 
00617   if (!tile_cleared && IsTileType(tile, MP_ROAD)) {
00618     /* Don't put the pieces that already exist */
00619     pieces &= ComplementRoadBits(existing);
00620 
00621     /* Check if new road bits will have the same foundation as other existing road types */
00622     if (IsNormalRoad(tile)) {
00623       Slope slope = GetTileSlope(tile, NULL);
00624       Foundation found_new = GetRoadFoundation(slope, pieces | existing);
00625 
00626       /* Test if all other roadtypes can be built at that foundation */
00627       for (RoadType rtest = ROADTYPE_ROAD; rtest < ROADTYPE_END; rtest++) {
00628         if (rtest != rt) { // check only other road types
00629           RoadBits bits = GetRoadBits(tile, rtest);
00630           /* do not check if there are not road bits of given type */
00631           if (bits != ROAD_NONE && GetRoadFoundation(slope, bits) != found_new) {
00632             return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00633           }
00634         }
00635       }
00636     }
00637   }
00638 
00639   if (!tile_cleared && !EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00640 
00641   cost.AddCost(CountBits(pieces) * _price[PR_BUILD_ROAD]);
00642   if (!tile_cleared && IsTileType(tile, MP_TUNNELBRIDGE)) {
00643     /* Pay for *every* tile of the bridge or tunnel */
00644     cost.MultiplyCost(GetTunnelBridgeLength(GetOtherTunnelBridgeEnd(tile), tile) + 2);
00645   }
00646 
00647   if (flags & DC_EXEC) {
00648     /* CmdBuildLongRoad calls us directly with DC_EXEC, so we may only clear the tile after all
00649      * fail/success tests have been done. */
00650     if (tile_cleared) DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00651 
00652     switch (GetTileType(tile)) {
00653       case MP_ROAD: {
00654         RoadTileType rtt = GetRoadTileType(tile);
00655         if (existing == ROAD_NONE || rtt == ROAD_TILE_CROSSING) {
00656           SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00657           SetRoadOwner(tile, rt, _current_company);
00658           if (rt == ROADTYPE_ROAD) SetTownIndex(tile, p2);
00659         }
00660         if (rtt != ROAD_TILE_CROSSING) SetRoadBits(tile, existing | pieces, rt);
00661       } break;
00662 
00663       case MP_TUNNELBRIDGE: {
00664         TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
00665 
00666         SetRoadTypes(other_end, GetRoadTypes(other_end) | RoadTypeToRoadTypes(rt));
00667         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00668         SetRoadOwner(other_end, rt, _current_company);
00669         SetRoadOwner(tile, rt, _current_company);
00670 
00671         /* Mark tiles diry that have been repaved */
00672         MarkTileDirtyByTile(other_end);
00673         MarkTileDirtyByTile(tile);
00674         if (IsBridge(tile)) {
00675           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
00676 
00677           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
00678         }
00679       } break;
00680 
00681       case MP_STATION:
00682         assert(IsDriveThroughStopTile(tile));
00683         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00684         SetRoadOwner(tile, rt, _current_company);
00685         break;
00686 
00687       default:
00688         MakeRoadNormal(tile, pieces, RoadTypeToRoadTypes(rt), p2, _current_company, _current_company);
00689         break;
00690     }
00691 
00692     if (rt != ROADTYPE_TRAM && IsNormalRoadTile(tile)) {
00693       existing |= pieces;
00694       SetDisallowedRoadDirections(tile, IsStraightRoad(existing) ?
00695           GetDisallowedRoadDirections(tile) ^ toggle_drd : DRD_NONE);
00696     }
00697 
00698     MarkTileDirtyByTile(tile);
00699   }
00700   return cost;
00701 }
00702 
00717 CommandCost CmdBuildLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00718 {
00719   CommandCost cost(EXPENSES_CONSTRUCTION);
00720   bool had_bridge = false;
00721   bool had_tunnel = false;
00722   bool had_success = false;
00723   DisallowedRoadDirections drd = DRD_NORTHBOUND;
00724 
00725   _error_message = INVALID_STRING_ID;
00726 
00727   if (p1 >= MapSize()) return CMD_ERROR;
00728 
00729   TileIndex end_tile = p1;
00730   RoadType rt = Extract<RoadType, 3, 2>(p2);
00731   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00732 
00733   Axis axis = Extract<Axis, 2, 1>(p2);
00734   /* Only drag in X or Y direction dictated by the direction variable */
00735   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00736   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00737 
00738   DiagDirection dir = AxisToDiagDir(axis);
00739 
00740   /* Swap direction, also the half-tile drag var (bit 0 and 1) */
00741   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00742     dir = ReverseDiagDir(dir);
00743     p2 ^= 3;
00744     drd = DRD_SOUTHBOUND;
00745   }
00746 
00747   /* On the X-axis, we have to swap the initial bits, so they
00748    * will be interpreted correctly in the GTTS. Futhermore
00749    * when you just 'click' on one tile to build them. */
00750   if ((axis == AXIS_Y) == (start_tile == end_tile && HasBit(p2, 0) == HasBit(p2, 1))) drd ^= DRD_BOTH;
00751   /* No disallowed direction bits have to be toggled */
00752   if (!HasBit(p2, 5)) drd = DRD_NONE;
00753 
00754   TileIndex tile = start_tile;
00755   /* Start tile is the first tile clicked by the user. */
00756   for (;;) {
00757     RoadBits bits = AxisToRoadBits(axis);
00758 
00759     /* Road parts only have to be built at the start tile or at the end tile. */
00760     if (tile == end_tile && !HasBit(p2, 1)) bits &= DiagDirToRoadBits(ReverseDiagDir(dir));
00761     if (tile == start_tile && HasBit(p2, 0)) bits &= DiagDirToRoadBits(dir);
00762 
00763     _error_message = INVALID_STRING_ID;
00764     CommandCost ret = DoCommand(tile, drd << 6 | rt << 4 | bits, 0, flags, CMD_BUILD_ROAD);
00765     if (ret.Failed()) {
00766       if (_error_message != STR_ERROR_ALREADY_BUILT) {
00767         if (HasBit(p2, 6)) return CMD_ERROR;
00768         break;
00769       }
00770     } else {
00771       had_success = true;
00772       /* Only pay for the upgrade on one side of the bridges and tunnels */
00773       if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00774         if (IsBridge(tile)) {
00775           if ((!had_bridge || GetTunnelBridgeDirection(tile) == dir)) {
00776             cost.AddCost(ret);
00777           }
00778           had_bridge = true;
00779         } else { // IsTunnel(tile)
00780           if ((!had_tunnel || GetTunnelBridgeDirection(tile) == dir)) {
00781             cost.AddCost(ret);
00782           }
00783           had_tunnel = true;
00784         }
00785       } else {
00786         cost.AddCost(ret);
00787       }
00788     }
00789 
00790     if (tile == end_tile) break;
00791 
00792     tile += TileOffsByDiagDir(dir);
00793   }
00794 
00795   return !had_success ? CMD_ERROR : cost;
00796 }
00797 
00810 CommandCost CmdRemoveLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00811 {
00812   CommandCost cost(EXPENSES_CONSTRUCTION);
00813 
00814   if (p1 >= MapSize()) return CMD_ERROR;
00815 
00816   TileIndex end_tile = p1;
00817   RoadType rt = Extract<RoadType, 3, 2>(p2);
00818   if (!IsValidRoadType(rt)) return CMD_ERROR;
00819 
00820   Axis axis = Extract<Axis, 2, 1>(p2);
00821   /* Only drag in X or Y direction dictated by the direction variable */
00822   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00823   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00824 
00825   /* Swap start and ending tile, also the half-tile drag var (bit 0 and 1) */
00826   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00827     TileIndex t = start_tile;
00828     start_tile = end_tile;
00829     end_tile = t;
00830     p2 ^= IsInsideMM(p2 & 3, 1, 3) ? 3 : 0;
00831   }
00832 
00833   Money money = GetAvailableMoneyForCommand();
00834   TileIndex tile = start_tile;
00835   /* Start tile is the small number. */
00836   for (;;) {
00837     RoadBits bits = AxisToRoadBits(axis);
00838 
00839     if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
00840     if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
00841 
00842     /* try to remove the halves. */
00843     if (bits != 0) {
00844       CommandCost ret = RemoveRoad(tile, flags & ~DC_EXEC, bits, rt, true);
00845       if (ret.Succeeded()) {
00846         if (flags & DC_EXEC) {
00847           money -= ret.GetCost();
00848           if (money < 0) {
00849             _additional_cash_required = DoCommand(start_tile, end_tile, p2, flags & ~DC_EXEC, CMD_REMOVE_LONG_ROAD).GetCost();
00850             return cost;
00851           }
00852           RemoveRoad(tile, flags, bits, rt, true, false);
00853         }
00854         cost.AddCost(ret);
00855       }
00856     }
00857 
00858     if (tile == end_tile) break;
00859 
00860     tile += (axis == AXIS_Y) ? TileDiffXY(0, 1) : TileDiffXY(1, 0);
00861   }
00862 
00863   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
00864 }
00865 
00878 CommandCost CmdBuildRoadDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00879 {
00880   DiagDirection dir = Extract<DiagDirection, 0, 2>(p1);
00881   RoadType rt = Extract<RoadType, 2, 2>(p1);
00882 
00883   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00884 
00885   Slope tileh = GetTileSlope(tile, NULL);
00886   if (tileh != SLOPE_FLAT && (
00887         !_settings_game.construction.build_on_slopes ||
00888         IsSteepSlope(tileh) ||
00889         !CanBuildDepotByTileh(dir, tileh)
00890       )) {
00891     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00892   }
00893 
00894   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00895   if (cost.Failed()) return CMD_ERROR;
00896 
00897   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
00898 
00899   if (!Depot::CanAllocateItem()) return CMD_ERROR;
00900 
00901   if (flags & DC_EXEC) {
00902     Depot *dep = new Depot(tile);
00903     dep->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
00904 
00905     MakeRoadDepot(tile, _current_company, dep->index, dir, rt);
00906     MarkTileDirtyByTile(tile);
00907   }
00908   cost.AddCost(_price[PR_BUILD_DEPOT_ROAD]);
00909   return cost;
00910 }
00911 
00912 static CommandCost RemoveRoadDepot(TileIndex tile, DoCommandFlag flags)
00913 {
00914   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER) return CMD_ERROR;
00915 
00916   if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00917 
00918   if (flags & DC_EXEC) {
00919     delete Depot::GetByTile(tile);
00920     DoClearSquare(tile);
00921   }
00922 
00923   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_ROAD]);
00924 }
00925 
00926 static CommandCost ClearTile_Road(TileIndex tile, DoCommandFlag flags)
00927 {
00928   switch (GetRoadTileType(tile)) {
00929     case ROAD_TILE_NORMAL: {
00930       RoadBits b = GetAllRoadBits(tile);
00931 
00932       /* Clear the road if only one piece is on the tile OR we are not using the DC_AUTO flag */
00933       if ((HasExactlyOneBit(b) && GetRoadBits(tile, ROADTYPE_TRAM) == ROAD_NONE) || !(flags & DC_AUTO)) {
00934         RoadTypes rts = GetRoadTypes(tile);
00935         CommandCost ret(EXPENSES_CONSTRUCTION);
00936         for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
00937           if (HasBit(rts, rt)) {
00938             CommandCost tmp_ret = RemoveRoad(tile, flags, GetRoadBits(tile, rt), rt, true);
00939             if (tmp_ret.Failed()) return tmp_ret;
00940             ret.AddCost(tmp_ret);
00941           }
00942         }
00943         return ret;
00944       }
00945       return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
00946     }
00947 
00948     case ROAD_TILE_CROSSING: {
00949       RoadTypes rts = GetRoadTypes(tile);
00950       CommandCost ret(EXPENSES_CONSTRUCTION);
00951 
00952       if (flags & DC_AUTO) return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
00953 
00954       /* Must iterate over the roadtypes in a reverse manner because
00955        * tram tracks must be removed before the road bits. */
00956       RoadType rt = ROADTYPE_TRAM;
00957       do {
00958         if (HasBit(rts, rt)) {
00959           CommandCost tmp_ret = RemoveRoad(tile, flags, GetCrossingRoadBits(tile), rt, false);
00960           if (tmp_ret.Failed()) return tmp_ret;
00961           ret.AddCost(tmp_ret);
00962         }
00963       } while (rt-- != ROADTYPE_ROAD);
00964 
00965       if (flags & DC_EXEC) {
00966         DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00967       }
00968       return ret;
00969     }
00970 
00971     default:
00972     case ROAD_TILE_DEPOT:
00973       if (flags & DC_AUTO) {
00974         return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
00975       }
00976       return RemoveRoadDepot(tile, flags);
00977   }
00978 }
00979 
00980 
00981 struct DrawRoadTileStruct {
00982   uint16 image;
00983   byte subcoord_x;
00984   byte subcoord_y;
00985 };
00986 
00987 #include "table/road_land.h"
00988 
00996 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits)
00997 {
00998   /* Flat land and land without a road doesn't require a foundation */
00999   if (tileh == SLOPE_FLAT || bits == ROAD_NONE) return FOUNDATION_NONE;
01000 
01001   if (!IsSteepSlope(tileh)) {
01002     /* Leveled RoadBits on a slope */
01003     if ((_invalid_tileh_slopes_road[0][tileh] & bits) == ROAD_NONE) return FOUNDATION_LEVELED;
01004 
01005     /* Straight roads without foundation on a slope */
01006     if (!IsSlopeWithOneCornerRaised(tileh) &&
01007         (_invalid_tileh_slopes_road[1][tileh] & bits) == ROAD_NONE)
01008       return FOUNDATION_NONE;
01009   }
01010 
01011   /* Roads on steep Slopes or on Slopes with one corner raised */
01012   return (bits == ROAD_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
01013 }
01014 
01015 const byte _road_sloped_sprites[14] = {
01016   0,  0,  2,  0,
01017   0,  1,  0,  0,
01018   3,  0,  0,  0,
01019   0,  0
01020 };
01021 
01032 static bool AlwaysDrawUnpavedRoads(TileIndex tile, Roadside roadside)
01033 {
01034   return (IsOnSnow(tile) &&
01035       !(_settings_game.game_creation.landscape == LT_TROPIC && HasGrfMiscBit(GMB_DESERT_PAVED_ROADS) &&
01036         roadside != ROADSIDE_BARREN && roadside != ROADSIDE_GRASS && roadside != ROADSIDE_GRASS_ROAD_WORKS));
01037 }
01038 
01044 void DrawTramCatenary(const TileInfo *ti, RoadBits tram)
01045 {
01046   /* Do not draw catenary if it is invisible */
01047   if (IsInvisibilitySet(TO_CATENARY)) return;
01048 
01049   /* Don't draw the catenary under a low bridge */
01050   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_CATENARY)) {
01051     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01052 
01053     if (height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) return;
01054   }
01055 
01056   SpriteID front;
01057   SpriteID back;
01058 
01059   if (ti->tileh != SLOPE_FLAT) {
01060     back  = SPR_TRAMWAY_BACK_WIRES_SLOPED  + _road_sloped_sprites[ti->tileh - 1];
01061     front = SPR_TRAMWAY_FRONT_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
01062   } else {
01063     back  = SPR_TRAMWAY_BASE + _road_backpole_sprites_1[tram];
01064     front = SPR_TRAMWAY_BASE + _road_frontwire_sprites_1[tram];
01065   }
01066 
01067   AddSortableSpriteToDraw(back,  PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01068   AddSortableSpriteToDraw(front, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01069 }
01070 
01079 static void DrawRoadDetail(SpriteID img, const TileInfo *ti, int dx, int dy, int h)
01080 {
01081   int x = ti->x | dx;
01082   int y = ti->y | dy;
01083   byte z = ti->z;
01084   if (ti->tileh != SLOPE_FLAT) z = GetSlopeZ(x, y);
01085   AddSortableSpriteToDraw(img, PAL_NONE, x, y, 2, 2, h, z);
01086 }
01087 
01092 static void DrawRoadBits(TileInfo *ti)
01093 {
01094   RoadBits road = GetRoadBits(ti->tile, ROADTYPE_ROAD);
01095   RoadBits tram = GetRoadBits(ti->tile, ROADTYPE_TRAM);
01096 
01097   SpriteID image = 0;
01098   PaletteID pal = PAL_NONE;
01099 
01100   if (ti->tileh != SLOPE_FLAT) {
01101     DrawFoundation(ti, GetRoadFoundation(ti->tileh, road | tram));
01102 
01103     /* DrawFoundation() modifies ti.
01104      * Default sloped sprites.. */
01105     if (ti->tileh != SLOPE_FLAT) image = _road_sloped_sprites[ti->tileh - 1] + 0x53F;
01106   }
01107 
01108   if (image == 0) image = _road_tile_sprites_1[road != ROAD_NONE ? road : tram];
01109 
01110   Roadside roadside = GetRoadside(ti->tile);
01111 
01112   if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01113     image += 19;
01114   } else {
01115     switch (roadside) {
01116       case ROADSIDE_BARREN:           pal = PALETTE_TO_BARE_LAND; break;
01117       case ROADSIDE_GRASS:            break;
01118       case ROADSIDE_GRASS_ROAD_WORKS: break;
01119       default:                        image -= 19; break; // Paved
01120     }
01121   }
01122 
01123   DrawGroundSprite(image, pal);
01124 
01125   /* For tram we overlay the road graphics with either tram tracks only
01126    * (when there is actual road beneath the trams) or with tram tracks
01127    * and some dirts which hides the road graphics */
01128   if (tram != ROAD_NONE) {
01129     if (ti->tileh != SLOPE_FLAT) {
01130       image = _road_sloped_sprites[ti->tileh - 1] + SPR_TRAMWAY_SLOPED_OFFSET;
01131     } else {
01132       image = _road_tile_sprites_1[tram] - SPR_ROAD_Y;
01133     }
01134     image += (road == ROAD_NONE) ? SPR_TRAMWAY_TRAM : SPR_TRAMWAY_OVERLAY;
01135     DrawGroundSprite(image, pal);
01136   }
01137 
01138   if (road != ROAD_NONE) {
01139     DisallowedRoadDirections drd = GetDisallowedRoadDirections(ti->tile);
01140     if (drd != DRD_NONE) {
01141       DrawGroundSpriteAt(SPR_ONEWAY_BASE + drd - 1 + ((road == ROAD_X) ? 0 : 3), PAL_NONE, 8, 8, GetPartialZ(8, 8, ti->tileh));
01142     }
01143   }
01144 
01145   if (HasRoadWorks(ti->tile)) {
01146     /* Road works */
01147     DrawGroundSprite((road | tram) & ROAD_X ? SPR_EXCAVATION_X : SPR_EXCAVATION_Y, PAL_NONE);
01148     return;
01149   }
01150 
01151   if (tram != ROAD_NONE) DrawTramCatenary(ti, tram);
01152 
01153   /* Return if full detail is disabled, or we are zoomed fully out. */
01154   if (!HasBit(_display_opt, DO_FULL_DETAIL) || _cur_dpi->zoom > ZOOM_LVL_DETAIL) return;
01155 
01156   /* Do not draw details (street lights, trees) under low bridge */
01157   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && (roadside == ROADSIDE_TREES || roadside == ROADSIDE_STREET_LIGHTS)) {
01158     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01159     uint minz = GetTileMaxZ(ti->tile) + 2 * TILE_HEIGHT;
01160 
01161     if (roadside == ROADSIDE_TREES) minz += TILE_HEIGHT;
01162 
01163     if (height < minz) return;
01164   }
01165 
01166   /* If there are no road bits, return, as there is nothing left to do */
01167   if (HasAtMostOneBit(road)) return;
01168 
01169   /* Draw extra details. */
01170   for (const DrawRoadTileStruct *drts = _road_display_table[roadside][road | tram]; drts->image != 0; drts++) {
01171     DrawRoadDetail(drts->image, ti, drts->subcoord_x, drts->subcoord_y, 0x10);
01172   }
01173 }
01174 
01176 static void DrawTile_Road(TileInfo *ti)
01177 {
01178   switch (GetRoadTileType(ti->tile)) {
01179     case ROAD_TILE_NORMAL:
01180       DrawRoadBits(ti);
01181       break;
01182 
01183     case ROAD_TILE_CROSSING: {
01184       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01185 
01186       PaletteID pal = PAL_NONE;
01187       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
01188 
01189       if (rti->UsesOverlay()) {
01190         Axis axis = GetCrossingRailAxis(ti->tile);
01191         SpriteID road = SPR_ROAD_Y + axis;
01192 
01193         Roadside roadside = GetRoadside(ti->tile);
01194 
01195         if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01196           road += 19;
01197         } else {
01198           switch (roadside) {
01199             case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
01200             case ROADSIDE_GRASS:  break;
01201             default:              road -= 19; break; // Paved
01202           }
01203         }
01204 
01205         DrawGroundSprite(road, pal);
01206 
01207         SpriteID rail = GetCustomRailSprite(rti, ti->tile, RTSG_CROSSING) + axis;
01208         DrawGroundSprite(rail, PAL_NONE);
01209         DrawRailTileSeq(ti, &_crossing_layout, TO_CATENARY, rail, 0, PAL_NONE);
01210       } else {
01211         SpriteID image = rti->base_sprites.crossing;
01212 
01213         if (GetCrossingRoadAxis(ti->tile) == AXIS_X) image++;
01214         if (IsCrossingBarred(ti->tile)) image += 2;
01215 
01216         Roadside roadside = GetRoadside(ti->tile);
01217 
01218         if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01219           image += 8;
01220         } else {
01221           switch (roadside) {
01222             case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
01223             case ROADSIDE_GRASS:  break;
01224             default:              image += 4; break; // Paved
01225           }
01226         }
01227 
01228         DrawGroundSprite(image, pal);
01229 
01230         /* PBS debugging, draw reserved tracks darker */
01231         if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) {
01232           DrawGroundSprite(GetCrossingRoadAxis(ti->tile) == AXIS_Y ? GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_x : GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_y, PALETTE_CRASH);
01233         }
01234       }
01235 
01236       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01237         DrawGroundSprite(SPR_TRAMWAY_OVERLAY + (GetCrossingRoadAxis(ti->tile) ^ 1), pal);
01238         DrawTramCatenary(ti, GetCrossingRoadBits(ti->tile));
01239       }
01240       if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01241       break;
01242     }
01243 
01244     default:
01245     case ROAD_TILE_DEPOT: {
01246       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01247 
01248       PaletteID palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
01249 
01250       const DrawTileSprites *dts;
01251       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01252         dts =  &_tram_depot[GetRoadDepotDirection(ti->tile)];
01253       } else {
01254         dts =  &_road_depot[GetRoadDepotDirection(ti->tile)];
01255       }
01256 
01257       DrawGroundSprite(dts->ground.sprite, PAL_NONE);
01258       DrawOrigTileSeq(ti, dts, TO_BUILDINGS, palette);
01259       break;
01260     }
01261   }
01262   DrawBridgeMiddle(ti);
01263 }
01264 
01265 void DrawRoadDepotSprite(int x, int y, DiagDirection dir, RoadType rt)
01266 {
01267   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
01268   const DrawTileSprites *dts = (rt == ROADTYPE_TRAM) ? &_tram_depot[dir] : &_road_depot[dir];
01269 
01270   x += 33;
01271   y += 17;
01272 
01273   DrawSprite(dts->ground.sprite, PAL_NONE, x, y);
01274   DrawOrigTileSeqInGUI(x, y, dts, palette);
01275 }
01276 
01282 void UpdateNearestTownForRoadTiles(bool invalidate)
01283 {
01284   assert(!invalidate || _generating_world);
01285 
01286   for (TileIndex t = 0; t < MapSize(); t++) {
01287     if (IsTileType(t, MP_ROAD) && !IsRoadDepot(t) && !HasTownOwnedRoad(t)) {
01288       TownID tid = (TownID)INVALID_TOWN;
01289       if (!invalidate) {
01290         const Town *town = CalcClosestTownFromTile(t);
01291         if (town != NULL) tid = town->index;
01292       }
01293       SetTownIndex(t, tid);
01294     }
01295   }
01296 }
01297 
01298 static uint GetSlopeZ_Road(TileIndex tile, uint x, uint y)
01299 {
01300   uint z;
01301   Slope tileh = GetTileSlope(tile, &z);
01302 
01303   if (tileh == SLOPE_FLAT) return z;
01304   if (IsNormalRoad(tile)) {
01305     Foundation f = GetRoadFoundation(tileh, GetAllRoadBits(tile));
01306     z += ApplyFoundationToSlope(f, &tileh);
01307     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
01308   } else {
01309     return z + TILE_HEIGHT;
01310   }
01311 }
01312 
01313 static Foundation GetFoundation_Road(TileIndex tile, Slope tileh)
01314 {
01315   if (IsNormalRoad(tile)) {
01316     return GetRoadFoundation(tileh, GetAllRoadBits(tile));
01317   } else {
01318     return FlatteningFoundation(tileh);
01319   }
01320 }
01321 
01322 static const Roadside _town_road_types[][2] = {
01323   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01324   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01325   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01326   { ROADSIDE_TREES,         ROADSIDE_TREES },
01327   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01328 };
01329 
01330 static const Roadside _town_road_types_2[][2] = {
01331   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01332   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01333   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01334   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01335   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01336 };
01337 
01338 
01339 static void TileLoop_Road(TileIndex tile)
01340 {
01341   switch (_settings_game.game_creation.landscape) {
01342     case LT_ARCTIC:
01343       if (IsOnSnow(tile) != (GetTileZ(tile) > GetSnowLine())) {
01344         ToggleSnow(tile);
01345         MarkTileDirtyByTile(tile);
01346       }
01347       break;
01348 
01349     case LT_TROPIC:
01350       if (GetTropicZone(tile) == TROPICZONE_DESERT && !IsOnDesert(tile)) {
01351         ToggleDesert(tile);
01352         MarkTileDirtyByTile(tile);
01353       }
01354       break;
01355   }
01356 
01357   if (IsRoadDepot(tile)) return;
01358 
01359   const Town *t = ClosestTownFromTile(tile, UINT_MAX);
01360   if (!HasRoadWorks(tile)) {
01361     HouseZonesBits grp = HZB_TOWN_EDGE;
01362 
01363     if (t != NULL) {
01364       grp = GetTownRadiusGroup(t, tile);
01365 
01366       /* Show an animation to indicate road work */
01367       if (t->road_build_months != 0 &&
01368           (DistanceManhattan(t->xy, tile) < 8 || grp != HZB_TOWN_EDGE) &&
01369           IsNormalRoad(tile) && !HasAtMostOneBit(GetAllRoadBits(tile))) {
01370         if (GetFoundationSlope(tile, NULL) == SLOPE_FLAT && EnsureNoVehicleOnGround(tile) && Chance16(1, 40)) {
01371           StartRoadWorks(tile);
01372 
01373           SndPlayTileFx(SND_21_JACKHAMMER, tile);
01374           CreateEffectVehicleAbove(
01375             TileX(tile) * TILE_SIZE + 7,
01376             TileY(tile) * TILE_SIZE + 7,
01377             0,
01378             EV_BULLDOZER);
01379           MarkTileDirtyByTile(tile);
01380           return;
01381         }
01382       }
01383     }
01384 
01385     {
01386       /* Adjust road ground type depending on 'grp' (grp is the distance to the center) */
01387       const Roadside *new_rs = (_settings_game.game_creation.landscape == LT_TOYLAND) ? _town_road_types_2[grp] : _town_road_types[grp];
01388       Roadside cur_rs = GetRoadside(tile);
01389 
01390       /* We have our desired type, do nothing */
01391       if (cur_rs == new_rs[0]) return;
01392 
01393       /* We have the pre-type of the desired type, switch to the desired type */
01394       if (cur_rs == new_rs[1]) {
01395         cur_rs = new_rs[0];
01396       /* We have barren land, install the pre-type */
01397       } else if (cur_rs == ROADSIDE_BARREN) {
01398         cur_rs = new_rs[1];
01399       /* We're totally off limits, remove any installation and make barren land */
01400       } else {
01401         cur_rs = ROADSIDE_BARREN;
01402       }
01403       SetRoadside(tile, cur_rs);
01404       MarkTileDirtyByTile(tile);
01405     }
01406   } else if (IncreaseRoadWorksCounter(tile)) {
01407     TerminateRoadWorks(tile);
01408 
01409     if (_settings_game.economy.mod_road_rebuild) {
01410       /* Generate a nicer town surface */
01411       const RoadBits old_rb = GetAnyRoadBits(tile, ROADTYPE_ROAD);
01412       const RoadBits new_rb = CleanUpRoadBits(tile, old_rb);
01413 
01414       if (old_rb != new_rb) {
01415         RemoveRoad(tile, DC_EXEC | DC_AUTO | DC_NO_WATER, (old_rb ^ new_rb), ROADTYPE_ROAD, true);
01416       }
01417     }
01418 
01419     MarkTileDirtyByTile(tile);
01420   }
01421 }
01422 
01423 static bool ClickTile_Road(TileIndex tile)
01424 {
01425   if (!IsRoadDepot(tile)) return false;
01426 
01427   ShowDepotWindow(tile, VEH_ROAD);
01428   return true;
01429 }
01430 
01431 /* Converts RoadBits to TrackBits */
01432 static const byte _road_trackbits[16] = {
01433   0x0, 0x0, 0x0, 0x10, 0x0, 0x2, 0x8, 0x1A, 0x0, 0x4, 0x1, 0x15, 0x20, 0x26, 0x29, 0x3F,
01434 };
01435 
01436 static TrackStatus GetTileTrackStatus_Road(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
01437 {
01438   TrackdirBits trackdirbits = TRACKDIR_BIT_NONE;
01439   TrackdirBits red_signals = TRACKDIR_BIT_NONE; // crossing barred
01440   switch (mode) {
01441     case TRANSPORT_RAIL:
01442       if (IsLevelCrossing(tile)) trackdirbits = TrackBitsToTrackdirBits(GetCrossingRailBits(tile));
01443       break;
01444 
01445     case TRANSPORT_ROAD:
01446       if ((GetRoadTypes(tile) & sub_mode) == 0) break;
01447       switch (GetRoadTileType(tile)) {
01448         case ROAD_TILE_NORMAL: {
01449           const uint drd_to_multiplier[DRD_END] = { 0x101, 0x100, 0x1, 0x0 };
01450           RoadType rt = (RoadType)FindFirstBit(sub_mode);
01451           RoadBits bits = GetRoadBits(tile, rt);
01452 
01453           /* no roadbit at this side of tile, return 0 */
01454           if (side != INVALID_DIAGDIR && (DiagDirToRoadBits(side) & bits) == 0) break;
01455 
01456           uint multiplier = drd_to_multiplier[rt == ROADTYPE_TRAM ? DRD_NONE : GetDisallowedRoadDirections(tile)];
01457           if (!HasRoadWorks(tile)) trackdirbits = (TrackdirBits)(_road_trackbits[bits] * multiplier);
01458           break;
01459         }
01460 
01461         case ROAD_TILE_CROSSING: {
01462           Axis axis = GetCrossingRoadAxis(tile);
01463 
01464           if (side != INVALID_DIAGDIR && axis != DiagDirToAxis(side)) break;
01465 
01466           trackdirbits = TrackBitsToTrackdirBits(AxisToTrackBits(axis));
01467           if (IsCrossingBarred(tile)) red_signals = trackdirbits;
01468           break;
01469         }
01470 
01471         default:
01472         case ROAD_TILE_DEPOT: {
01473           DiagDirection dir = GetRoadDepotDirection(tile);
01474 
01475           if (side != INVALID_DIAGDIR && side != dir) break;
01476 
01477           trackdirbits = TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir));
01478           break;
01479         }
01480       }
01481       break;
01482 
01483     default: break;
01484   }
01485   return CombineTrackStatus(trackdirbits, red_signals);
01486 }
01487 
01488 static const StringID _road_tile_strings[] = {
01489   STR_LAI_ROAD_DESCRIPTION_ROAD,
01490   STR_LAI_ROAD_DESCRIPTION_ROAD,
01491   STR_LAI_ROAD_DESCRIPTION_ROAD,
01492   STR_LAI_ROAD_DESCRIPTION_ROAD_WITH_STREETLIGHTS,
01493   STR_LAI_ROAD_DESCRIPTION_ROAD,
01494   STR_LAI_ROAD_DESCRIPTION_TREE_LINED_ROAD,
01495   STR_LAI_ROAD_DESCRIPTION_ROAD,
01496   STR_LAI_ROAD_DESCRIPTION_ROAD,
01497 };
01498 
01499 static void GetTileDesc_Road(TileIndex tile, TileDesc *td)
01500 {
01501   Owner rail_owner = INVALID_OWNER;
01502   Owner road_owner = INVALID_OWNER;
01503   Owner tram_owner = INVALID_OWNER;
01504 
01505   switch (GetRoadTileType(tile)) {
01506     case ROAD_TILE_CROSSING: {
01507       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_RAIL_LEVEL_CROSSING;
01508       RoadTypes rts = GetRoadTypes(tile);
01509       rail_owner = GetTileOwner(tile);
01510       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01511       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01512 
01513       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
01514       td->rail_speed = rti->max_speed;
01515 
01516       break;
01517     }
01518 
01519     case ROAD_TILE_DEPOT:
01520       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_VEHICLE_DEPOT;
01521       road_owner = GetTileOwner(tile); // Tile has only one owner, roadtype does not matter
01522       break;
01523 
01524     default: {
01525       RoadTypes rts = GetRoadTypes(tile);
01526       td->str = (HasBit(rts, ROADTYPE_ROAD) ? _road_tile_strings[GetRoadside(tile)] : STR_LAI_ROAD_DESCRIPTION_TRAMWAY);
01527       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01528       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01529       break;
01530     }
01531   }
01532 
01533   /* Now we have to discover, if the tile has only one owner or many:
01534    *   - Find a first_owner of the tile. (Currently road or tram must be present, but this will break when the third type becomes available)
01535    *   - Compare the found owner with the other owners, and test if they differ.
01536    * Note: If road exists it will be the first_owner.
01537    */
01538   Owner first_owner = (road_owner == INVALID_OWNER ? tram_owner : road_owner);
01539   bool mixed_owners = (tram_owner != INVALID_OWNER && tram_owner != first_owner) || (rail_owner != INVALID_OWNER && rail_owner != first_owner);
01540 
01541   if (mixed_owners) {
01542     /* Multiple owners */
01543     td->owner_type[0] = (rail_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_RAIL_OWNER);
01544     td->owner[0] = rail_owner;
01545     td->owner_type[1] = (road_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_ROAD_OWNER);
01546     td->owner[1] = road_owner;
01547     td->owner_type[2] = (tram_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_TRAM_OWNER);
01548     td->owner[2] = tram_owner;
01549   } else {
01550     /* One to rule them all */
01551     td->owner[0] = first_owner;
01552   }
01553 }
01554 
01559 static const byte _roadveh_enter_depot_dir[4] = {
01560   TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE
01561 };
01562 
01563 static VehicleEnterTileStatus VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
01564 {
01565   switch (GetRoadTileType(tile)) {
01566     case ROAD_TILE_DEPOT: {
01567       if (v->type != VEH_ROAD) break;
01568 
01569       RoadVehicle *rv = RoadVehicle::From(v);
01570       if (rv->frame == RVC_DEPOT_STOP_FRAME &&
01571           _roadveh_enter_depot_dir[GetRoadDepotDirection(tile)] == rv->state) {
01572         rv->state = RVSB_IN_DEPOT;
01573         rv->vehstatus |= VS_HIDDEN;
01574         rv->direction = ReverseDir(rv->direction);
01575         if (rv->Next() == NULL) VehicleEnterDepot(rv->First());
01576         rv->tile = tile;
01577 
01578         InvalidateWindowData(WC_VEHICLE_DEPOT, rv->tile);
01579         return VETSB_ENTERED_WORMHOLE;
01580       }
01581     } break;
01582 
01583     default: break;
01584   }
01585   return VETSB_CONTINUE;
01586 }
01587 
01588 
01589 static void ChangeTileOwner_Road(TileIndex tile, Owner old_owner, Owner new_owner)
01590 {
01591   if (IsRoadDepot(tile)) {
01592     if (GetTileOwner(tile) == old_owner) {
01593       if (new_owner == INVALID_OWNER) {
01594         DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
01595       } else {
01596         SetTileOwner(tile, new_owner);
01597       }
01598     }
01599     return;
01600   }
01601 
01602   for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
01603     /* Update all roadtypes, no matter if they are present */
01604     if (GetRoadOwner(tile, rt) == old_owner) {
01605       SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
01606     }
01607   }
01608 
01609   if (IsLevelCrossing(tile)) {
01610     if (GetTileOwner(tile) == old_owner) {
01611       if (new_owner == INVALID_OWNER) {
01612         DoCommand(tile, 0, GetCrossingRailTrack(tile), DC_EXEC | DC_BANKRUPT, CMD_REMOVE_SINGLE_RAIL);
01613       } else {
01614         SetTileOwner(tile, new_owner);
01615       }
01616     }
01617   }
01618 }
01619 
01620 static CommandCost TerraformTile_Road(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
01621 {
01622   if (_settings_game.construction.build_on_slopes && AutoslopeEnabled()) {
01623     switch (GetRoadTileType(tile)) {
01624       case ROAD_TILE_CROSSING:
01625         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]);
01626         break;
01627 
01628       case ROAD_TILE_DEPOT:
01629         if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRoadDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01630         break;
01631 
01632       case ROAD_TILE_NORMAL: {
01633         RoadBits bits = GetAllRoadBits(tile);
01634         RoadBits bits_copy = bits;
01635         /* Check if the slope-road_bits combination is valid at all, i.e. it is safe to call GetRoadFoundation(). */
01636         if (CheckRoadSlope(tileh_new, &bits_copy, ROAD_NONE, ROAD_NONE).Succeeded()) {
01637           /* CheckRoadSlope() sometimes changes the road_bits, if it does not agree with them. */
01638           if (bits == bits_copy) {
01639             uint z_old;
01640             Slope tileh_old = GetTileSlope(tile, &z_old);
01641 
01642             /* Get the slope on top of the foundation */
01643             z_old += ApplyFoundationToSlope(GetRoadFoundation(tileh_old, bits), &tileh_old);
01644             z_new += ApplyFoundationToSlope(GetRoadFoundation(tileh_new, bits), &tileh_new);
01645 
01646             /* The surface slope must not be changed */
01647             if ((z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01648           }
01649         }
01650         break;
01651       }
01652 
01653       default: NOT_REACHED();
01654     }
01655   }
01656 
01657   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
01658 }
01659 
01661 extern const TileTypeProcs _tile_type_road_procs = {
01662   DrawTile_Road,           // draw_tile_proc
01663   GetSlopeZ_Road,          // get_slope_z_proc
01664   ClearTile_Road,          // clear_tile_proc
01665   NULL,                    // add_accepted_cargo_proc
01666   GetTileDesc_Road,        // get_tile_desc_proc
01667   GetTileTrackStatus_Road, // get_tile_track_status_proc
01668   ClickTile_Road,          // click_tile_proc
01669   NULL,                    // animate_tile_proc
01670   TileLoop_Road,           // tile_loop_clear
01671   ChangeTileOwner_Road,    // change_tile_owner_clear
01672   NULL,                    // add_produced_cargo_proc
01673   VehicleEnter_Road,       // vehicle_enter_tile_proc
01674   GetFoundation_Road,      // get_foundation_proc
01675   TerraformTile_Road,      // terraform_tile_proc
01676 };

Generated on Tue Sep 14 17:06:53 2010 for OpenTTD by  doxygen 1.6.1