# road_cmd.cpp

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    00001 /* $Id: road_cmd.cpp 15454 2009-02-11 20:41:17Z rubidium $ */
    00002
    00005 #include "stdafx.h"
    00006 #include "openttd.h"
    00007 #include "cmd_helper.h"
    00008 #include "road_internal.h"
    00009 #include "landscape.h"
    00010 #include "town_map.h"
    00011 #include "viewport_func.h"
    00012 #include "command_func.h"
    00013 #include "yapf/yapf.h"
    00014 #include "depot_base.h"
    00015 #include "newgrf.h"
    00016 #include "station_map.h"
    00017 #include "variables.h"
    00018 #include "autoslope.h"
    00019 #include "tunnelbridge_map.h"
    00020 #include "window_func.h"
    00021 #include "strings_func.h"
    00022 #include "vehicle_func.h"
    00023 #include "vehicle_base.h"
    00024 #include "sound_func.h"
    00025 #include "tunnelbridge.h"
    00026 #include "cheat_type.h"
    00027 #include "functions.h"
    00028 #include "effectvehicle_func.h"
    00029 #include "elrail_func.h"
    00030 #include "roadveh.h"
    00031
    00032 #include "table/sprites.h"
    00033 #include "table/strings.h"
    00034
    00039 bool RoadVehiclesAreBuilt()
    00040 {
    00041   const Vehicle *v;
    00042
    00043   FOR_ALL_VEHICLES(v) {
    00044     if (v->type == VEH_ROAD) return true;
    00045   }
    00046   return false;
    00047 }
    00048
    00049 #define M(x) (1 << (x))
    00050 /* Level crossings may only be built on these slopes */
    00051 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));
    00052 #undef M
    00053
    00054 /* Invalid RoadBits on slopes  */
    00055 static const RoadBits _invalid_tileh_slopes_road[2][15] = {
    00056   /* The inverse of the mixable RoadBits on a leveled slope */
    00057   {
    00058     ROAD_NONE,         // SLOPE_FLAT
    00059     ROAD_NE | ROAD_SE, // SLOPE_W
    00060     ROAD_NE | ROAD_NW, // SLOPE_S
    00061
    00062     ROAD_NE,           // SLOPE_SW
    00063     ROAD_NW | ROAD_SW, // SLOPE_E
    00064     ROAD_NONE,         // SLOPE_EW
    00065
    00066     ROAD_NW,           // SLOPE_SE
    00067     ROAD_NONE,         // SLOPE_WSE
    00068     ROAD_SE | ROAD_SW, // SLOPE_N
    00069
    00070     ROAD_SE,           // SLOPE_NW
    00071     ROAD_NONE,         // SLOPE_NS
    00072     ROAD_NONE,         // SLOPE_ENW
    00073
    00074     ROAD_SW,           // SLOPE_NE
    00075     ROAD_NONE,         // SLOPE_SEN
    00076     ROAD_NONE          // SLOPE_NWS
    00077   },
    00078   /* The inverse of the allowed straight roads on a slope
    00079    * (with and without a foundation). */
    00080   {
    00081     ROAD_NONE, // SLOPE_FLAT
    00082     ROAD_NONE, // SLOPE_W    Foundation
    00083     ROAD_NONE, // SLOPE_S    Foundation
    00084
    00085     ROAD_Y,    // SLOPE_SW
    00086     ROAD_NONE, // SLOPE_E    Foundation
    00087     ROAD_ALL,  // SLOPE_EW
    00088
    00089     ROAD_X,    // SLOPE_SE
    00090     ROAD_ALL,  // SLOPE_WSE
    00091     ROAD_NONE, // SLOPE_N    Foundation
    00092
    00093     ROAD_X,    // SLOPE_NW
    00094     ROAD_ALL,  // SLOPE_NS
    00095     ROAD_ALL,  // SLOPE_ENW
    00096
    00097     ROAD_Y,    // SLOPE_NE
    00098     ROAD_ALL,  // SLOPE_SEN
    00099     ROAD_ALL   // SLOPE_NW
    00100   }
    00101 };
    00102
    00103 Foundation GetRoadFoundation(Slope tileh, RoadBits bits);
    00104
    00115 bool CheckAllowRemoveRoad(TileIndex tile, RoadBits remove, Owner owner, RoadType rt, DoCommandFlag flags, bool town_check)
    00116 {
    00117   if (_game_mode == GM_EDITOR || remove == ROAD_NONE) return true;
    00118
    00119   /* Water can always flood and towns can always remove "normal" road pieces.
    00120    * Towns are not be allowed to remove non "normal" road pieces, like tram
    00121    * tracks as that would result in trams that cannot turn. */
    00122   if (_current_company == OWNER_WATER ||
    00123       (rt == ROADTYPE_ROAD && !IsValidCompanyID(_current_company))) return true;
    00124
    00125   /* Only do the special processing if the road is owned
    00126    * by a town */
    00127   if (owner != OWNER_TOWN) return (owner == OWNER_NONE) || CheckOwnership(owner);
    00128
    00129   if (!town_check) return true;
    00130
    00131   if (_cheats.magic_bulldozer.value) return true;
    00132
    00133   Town *t = ClosestTownFromTile(tile, UINT_MAX);
    00134   if (t == NULL) return true;
    00135
    00136   /* check if you're allowed to remove the street owned by a town
    00137    * removal allowance depends on difficulty setting */
    00138   if (!CheckforTownRating(flags, t, ROAD_REMOVE)) return false;
    00139
    00140   /* Get a bitmask of which neighbouring roads has a tile */
    00141   RoadBits n = ROAD_NONE;
    00142   RoadBits present = GetAnyRoadBits(tile, rt);
    00143   if (present & ROAD_NE && GetAnyRoadBits(TILE_ADDXY(tile, -1,  0), rt) & ROAD_SW) n |= ROAD_NE;
    00144   if (present & ROAD_SE && GetAnyRoadBits(TILE_ADDXY(tile,  0,  1), rt) & ROAD_NW) n |= ROAD_SE;
    00145   if (present & ROAD_SW && GetAnyRoadBits(TILE_ADDXY(tile,  1,  0), rt) & ROAD_NE) n |= ROAD_SW;
    00146   if (present & ROAD_NW && GetAnyRoadBits(TILE_ADDXY(tile,  0, -1), rt) & ROAD_SE) n |= ROAD_NW;
    00147
    00148   int rating_decrease = RATING_ROAD_DOWN_STEP_EDGE;
    00149   /* If 0 or 1 bits are set in n, or if no bits that match the bits to remove,
    00150    * then allow it */
    00151   if (KillFirstBit(n) != ROAD_NONE && (n & remove) != ROAD_NONE) {
    00152     /* you can remove all kind of roads with extra dynamite */
    00153     if (!_settings_game.construction.extra_dynamite) {
    00154       SetDParam(0, t->index);
    00155       _error_message = STR_2009_LOCAL_AUTHORITY_REFUSES;
    00156       return false;
    00157     }
    00158     rating_decrease = RATING_ROAD_DOWN_STEP_INNER;
    00159   }
    00160   ChangeTownRating(t, rating_decrease, RATING_ROAD_MINIMUM, flags);
    00161
    00162   return true;
    00163 }
    00164
    00165
    00173 static CommandCost RemoveRoad(TileIndex tile, DoCommandFlag flags, RoadBits pieces, RoadType rt, bool crossing_check, bool town_check = true)
    00174 {
    00175   RoadTypes rts = GetRoadTypes(tile);
    00176   /* The tile doesn't have the given road type */
    00177   if (!HasBit(rts, rt)) return CMD_ERROR;
    00178
    00179   bool town_road_under_stop = false;
    00180
    00181   switch (GetTileType(tile)) {
    00182     case MP_ROAD:
    00183       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00184       break;
    00185
    00186     case MP_STATION:
    00187       if (!IsDriveThroughStopTile(tile)) return CMD_ERROR;
    00188       if (rt == ROADTYPE_ROAD) town_road_under_stop = GetStopBuiltOnTownRoad(tile);
    00189       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00190       break;
    00191
    00192     case MP_TUNNELBRIDGE:
    00193       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) return CMD_ERROR;
    00194       if (HasVehicleOnTunnelBridge(tile, GetOtherTunnelBridgeEnd(tile))) return CMD_ERROR;
    00195       break;
    00196
    00197     default:
    00198       return CMD_ERROR;
    00199   }
    00200
    00201   if (!CheckAllowRemoveRoad(tile, pieces, town_road_under_stop ? OWNER_TOWN : GetRoadOwner(tile, rt), rt, flags, town_check)) return CMD_ERROR;
    00202
    00203   if (!IsTileType(tile, MP_ROAD)) {
    00204     /* If it's the last roadtype, just clear the whole tile */
    00205     if (rts == RoadTypeToRoadTypes(rt)) return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00206
    00207     CommandCost cost(EXPENSES_CONSTRUCTION);
    00208     if (IsTileType(tile, MP_TUNNELBRIDGE)) {
    00209       TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
    00210       /* Pay for *every* tile of the bridge or tunnel */
    00211       cost.AddCost((GetTunnelBridgeLength(other_end, tile) + 2) * _price.remove_road);
    00212       if (flags & DC_EXEC) {
    00213         SetRoadTypes(other_end, GetRoadTypes(other_end) & ~RoadTypeToRoadTypes(rt));
    00214         SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
    00215
    00216         /* Mark tiles diry that have been repaved */
    00217         MarkTileDirtyByTile(tile);
    00218         MarkTileDirtyByTile(other_end);
    00219         if (IsBridge(tile)) {
    00220           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
    00221
    00222           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
    00223         }
    00224       }
    00225     } else {
    00226       assert(IsDriveThroughStopTile(tile));
    00227       cost.AddCost(_price.remove_road * 2);
    00228       if (flags & DC_EXEC) {
    00229         SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
    00230         MarkTileDirtyByTile(tile);
    00231       }
    00232     }
    00233     return cost;
    00234   }
    00235
    00236   switch (GetRoadTileType(tile)) {
    00237     case ROAD_TILE_NORMAL: {
    00238       const Slope tileh = GetTileSlope(tile, NULL);
    00239       RoadBits present = GetRoadBits(tile, rt);
    00240       const RoadBits other = GetOtherRoadBits(tile, rt);
    00241       const Foundation f = GetRoadFoundation(tileh, present);
    00242
    00243       if (HasRoadWorks(tile) && _current_company != OWNER_WATER) return_cmd_error(STR_ROAD_WORKS_IN_PROGRESS);
    00244
    00245       /* Autocomplete to a straight road
    00246        * @li on steep slopes
    00247        * @li if the bits of the other roadtypes result in another foundation
    00248        * @li if build on slopes is disabled */
    00249       if (IsSteepSlope(tileh) || (IsStraightRoad(other) &&
    00250           (other & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) != ROAD_NONE) ||
    00251           (tileh != SLOPE_FLAT && !_settings_game.construction.build_on_slopes)) {
    00252         pieces |= MirrorRoadBits(pieces);
    00253       }
    00254
    00255       /* limit the bits to delete to the existing bits. */
    00256       pieces &= present;
    00257       if (pieces == ROAD_NONE) return CMD_ERROR;
    00258
    00259       /* Now set present what it will be after the remove */
    00260       present ^= pieces;
    00261
    00262       /* Check for invalid RoadBit combinations on slopes */
    00263       if (tileh != SLOPE_FLAT && present != ROAD_NONE &&
    00264           (present & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) == present) {
    00265         return CMD_ERROR;
    00266       }
    00267
    00268       if (flags & DC_EXEC) {
    00269         if (HasRoadWorks(tile)) {
    00270           /* flooding tile with road works, don't forget to remove the effect vehicle too */
    00271           assert(_current_company == OWNER_WATER);
    00272           Vehicle *v;
    00273           FOR_ALL_VEHICLES(v) {
    00274             if (v->type == VEH_EFFECT && TileVirtXY(v->x_pos, v->y_pos) == tile) {
    00275               delete v;
    00276             }
    00277           }
    00278         }
    00279         if (present == ROAD_NONE) {
    00280           RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));
    00281           if (rts == ROADTYPES_NONE) {
    00282             /* Includes MarkTileDirtyByTile() */
    00283             DoClearSquare(tile);
    00284           } else {
    00285             if (rt == ROADTYPE_ROAD && IsRoadOwner(tile, ROADTYPE_ROAD, OWNER_TOWN)) {
    00286               /* Update nearest-town index */
    00287               const Town *town = CalcClosestTownFromTile(tile, UINT_MAX);
    00288               SetTownIndex(tile, town == NULL ? (TownID)INVALID_TOWN : town->index);
    00289             }
    00290             SetRoadBits(tile, ROAD_NONE, rt);
    00291             SetRoadTypes(tile, rts);
    00292             MarkTileDirtyByTile(tile);
    00293           }
    00294         } else {
    00295           /* When bits are removed, you *always* end up with something that
    00296            * is not a complete straight road tile. However, trams do not have
    00297            * onewayness, so they cannot remove it either. */
    00298           if (rt != ROADTYPE_TRAM) SetDisallowedRoadDirections(tile, DRD_NONE);
    00299           SetRoadBits(tile, present, rt);
    00300           MarkTileDirtyByTile(tile);
    00301         }
    00302       }
    00303
    00304       /* If we change the foundation we have to pay for it. */
    00305       return CommandCost(EXPENSES_CONSTRUCTION, CountBits(pieces) * _price.remove_road +
    00306           ((GetRoadFoundation(tileh, present) != f) ? _price.terraform : (Money)0));
    00307     }
    00308
    00309     case ROAD_TILE_CROSSING: {
    00310       if (pieces & ComplementRoadBits(GetCrossingRoadBits(tile))) {
    00311         return CMD_ERROR;
    00312       }
    00313
    00314       /* Don't allow road to be removed from the crossing when there is tram;
    00315        * we can't draw the crossing without roadbits ;) */
    00316       if (rt == ROADTYPE_ROAD && HasTileRoadType(tile, ROADTYPE_TRAM) && (flags & DC_EXEC || crossing_check)) return CMD_ERROR;
    00317
    00318       if (flags & DC_EXEC) {
    00319         RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));
    00320         if (rts == ROADTYPES_NONE) {
    00321           TrackBits tracks = GetCrossingRailBits(tile);
    00322           bool reserved = GetCrossingReservation(tile);
    00323           MakeRailNormal(tile, GetTileOwner(tile), tracks, GetRailType(tile));
    00324           if (reserved) SetTrackReservation(tile, tracks);
    00325         } else {
    00326           SetRoadTypes(tile, rts);
    00327           /* If we ever get HWAY and it is possible without road then we will need to promote ownership and invalidate town index here, too */
    00328         }
    00329         MarkTileDirtyByTile(tile);
    00330         YapfNotifyTrackLayoutChange(tile, FindFirstTrack(GetTrackBits(tile)));
    00331       }
    00332       return CommandCost(EXPENSES_CONSTRUCTION, _price.remove_road * 2);
    00333     }
    00334
    00335     default:
    00336     case ROAD_TILE_DEPOT:
    00337       return CMD_ERROR;
    00338   }
    00339 }
    00340
    00341
    00349 CommandCost CmdRemoveRoad(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00350 {
    00351   RoadType rt = (RoadType)GB(p1, 4, 2);
    00352   if (!IsValidRoadType(rt)) return CMD_ERROR;
    00353
    00354   RoadBits pieces = Extract<RoadBits, 0>(p1);
    00355
    00356   return RemoveRoad(tile, flags, pieces, rt, true);
    00357 }
    00358
    00370 static CommandCost CheckRoadSlope(Slope tileh, RoadBits *pieces, RoadBits existing, RoadBits other)
    00371 {
    00372   /* Remove already build pieces */
    00373   CLRBITS(*pieces, existing);
    00374
    00375   /* If we can't build anything stop here */
    00376   if (*pieces == ROAD_NONE) return CMD_ERROR;
    00377
    00378   /* All RoadBit combos are valid on flat land */
    00379   if (tileh == SLOPE_FLAT) return CommandCost();
    00380
    00381   /* Proceed steep Slopes first to reduce lookup table size */
    00382   if (IsSteepSlope(tileh)) {
    00383     /* Force straight roads. */
    00384     *pieces |= MirrorRoadBits(*pieces);
    00385
    00386     /* Use existing as all existing since only straight
    00387      * roads are allowed here. */
    00388     existing |= other;
    00389
    00390     if ((existing == ROAD_NONE || existing == *pieces) && IsStraightRoad(*pieces)) {
    00391       return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    00392     }
    00393     return CMD_ERROR;
    00394   }
    00395
    00396   /* Save the merge of all bits of the current type */
    00397   RoadBits type_bits = existing | *pieces;
    00398
    00399   /* Roads on slopes */
    00400   if (_settings_game.construction.build_on_slopes && (_invalid_tileh_slopes_road[0][tileh] & (other | type_bits)) == ROAD_NONE) {
    00401
    00402     /* If we add leveling we've got to pay for it */
    00403     if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    00404
    00405     return CommandCost();
    00406   }
    00407
    00408   /* Autocomplete uphill roads */
    00409   *pieces |= MirrorRoadBits(*pieces);
    00410   type_bits = existing | *pieces;
    00411
    00412   /* Uphill roads */
    00413   if (IsStraightRoad(type_bits) && (other == type_bits || other == ROAD_NONE) &&
    00414       (_invalid_tileh_slopes_road[1][tileh] & (other | type_bits)) == ROAD_NONE) {
    00415
    00416     /* Slopes with foundation ? */
    00417     if (IsSlopeWithOneCornerRaised(tileh)) {
    00418
    00419       /* Prevent build on slopes if it isn't allowed */
    00420       if (_settings_game.construction.build_on_slopes) {
    00421
    00422         /* If we add foundation we've got to pay for it */
    00423         if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    00424
    00425         return CommandCost();
    00426       }
    00427     } else {
    00428       if (CountBits(existing) == 1) return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    00429       return CommandCost();
    00430     }
    00431   }
    00432   return CMD_ERROR;
    00433 }
    00434
    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 ((IsValidCompanyID(_current_company) && p2 != 0) || (_current_company == OWNER_TOWN && !IsValidTownID(p2))) return CMD_ERROR;
    00453   if (_current_company != OWNER_TOWN) {
    00454     const Town *town = CalcClosestTownFromTile(tile, UINT_MAX);
    00455     p2 = (town != NULL) ? town->index : (TownID)INVALID_TOWN;
    00456   }
    00457
    00458   RoadBits pieces = Extract<RoadBits, 0>(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 = (RoadType)GB(p1, 4, 2);
    00464   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
    00465
    00466   DisallowedRoadDirections toggle_drd = (DisallowedRoadDirections)GB(p1, 6, 2);
    00467
    00468   Slope tileh = GetTileSlope(tile, NULL);
    00469
    00470   switch (GetTileType(tile)) {
    00471     case MP_ROAD:
    00472       switch (GetRoadTileType(tile)) {
    00473         case ROAD_TILE_NORMAL: {
    00474           if (HasRoadWorks(tile)) return_cmd_error(STR_ROAD_WORKS_IN_PROGRESS);
    00475
    00476           other_bits = GetOtherRoadBits(tile, rt);
    00477           if (!HasTileRoadType(tile, rt)) break;
    00478
    00479           existing = GetRoadBits(tile, rt);
    00480           bool crossing = !IsStraightRoad(existing | pieces);
    00481           if (rt != ROADTYPE_TRAM && (GetDisallowedRoadDirections(tile) != DRD_NONE || toggle_drd != DRD_NONE) && crossing) {
    00482             /* Junctions cannot be one-way */
    00483             return_cmd_error(STR_ERR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
    00484           }
    00485           if ((existing & pieces) == pieces) {
    00486             /* We only want to set the (dis)allowed road directions */
    00487             if (toggle_drd != DRD_NONE && rt != ROADTYPE_TRAM && IsRoadOwner(tile, ROADTYPE_ROAD, _current_company)) {
    00488               if (crossing) return_cmd_error(STR_ERR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
    00489
    00490               if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00491
    00492               /* Ignore half built tiles */
    00493               if (flags & DC_EXEC && rt != ROADTYPE_TRAM && IsStraightRoad(existing)) {
    00494                 SetDisallowedRoadDirections(tile, GetDisallowedRoadDirections(tile) ^ toggle_drd);
    00495                 MarkTileDirtyByTile(tile);
    00496               }
    00497               return CommandCost();
    00498             }
    00499             return_cmd_error(STR_1007_ALREADY_BUILT);
    00500           }
    00501         } break;
    00502
    00503         case ROAD_TILE_CROSSING:
    00504           other_bits = GetCrossingRoadBits(tile);
    00505           if (pieces & ComplementRoadBits(other_bits)) goto do_clear;
    00506           pieces = other_bits; // we need to pay for both roadbits
    00507
    00508           if (HasTileRoadType(tile, rt)) return_cmd_error(STR_1007_ALREADY_BUILT);
    00509           break;
    00510
    00511         default:
    00512         case ROAD_TILE_DEPOT:
    00513           goto do_clear;
    00514       }
    00515       break;
    00516
    00517     case MP_RAILWAY: {
    00518       if (IsSteepSlope(tileh)) {
    00519         return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00520       }
    00521
    00522       /* Level crossings may only be built on these slopes */
    00523       if (!HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh)) {
    00524         return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00525       }
    00526
    00527       if (GetRailTileType(tile) != RAIL_TILE_NORMAL) goto do_clear;
    00528
    00529       Axis roaddir;
    00530       switch (GetTrackBits(tile)) {
    00531         case TRACK_BIT_X:
    00532           if (pieces & ROAD_X) goto do_clear;
    00533           roaddir = AXIS_Y;
    00534           break;
    00535
    00536         case TRACK_BIT_Y:
    00537           if (pieces & ROAD_Y) goto do_clear;
    00538           roaddir = AXIS_X;
    00539           break;
    00540
    00541         default: goto do_clear;
    00542       }
    00543
    00544       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00545
    00546       if (flags & DC_EXEC) {
    00547         YapfNotifyTrackLayoutChange(tile, FindFirstTrack(GetTrackBits(tile)));
    00548         /* Always add road to the roadtypes (can't draw without it) */
    00549         bool reserved = HasBit(GetTrackReservation(tile), AxisToTrack(OtherAxis(roaddir)));
    00550         MakeRoadCrossing(tile, _current_company, _current_company, _current_company, GetTileOwner(tile), roaddir, GetRailType(tile), RoadTypeToRoadTypes(rt) | ROADTYPES_ROAD, p2);
    00551         SetCrossingReservation(tile, reserved);
    00552         UpdateLevelCrossing(tile, false);
    00553         MarkTileDirtyByTile(tile);
    00554       }
    00555       return CommandCost(EXPENSES_CONSTRUCTION, _price.build_road * (rt == ROADTYPE_ROAD ? 2 : 4));
    00556     }
    00557
    00558     case MP_STATION: {
    00559       if (!IsDriveThroughStopTile(tile)) goto do_clear;
    00560
    00561       RoadBits curbits = AxisToRoadBits(DiagDirToAxis(GetRoadStopDir(tile)));
    00562       if (pieces & ~curbits) goto do_clear;
    00563       pieces = curbits; // we need to pay for both roadbits
    00564
    00565       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_1007_ALREADY_BUILT);
    00566     } break;
    00567
    00568     case MP_TUNNELBRIDGE:
    00569       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) return CMD_ERROR;
    00570       if (MirrorRoadBits(DiagDirToRoadBits(GetTunnelBridgeDirection(tile))) != pieces) return CMD_ERROR;
    00571       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_1007_ALREADY_BUILT);
    00572       /* Don't allow adding roadtype to the bridge/tunnel when vehicles are already driving on it */
    00573       if (HasVehicleOnTunnelBridge(tile, GetOtherTunnelBridgeEnd(tile))) return CMD_ERROR;
    00574       break;
    00575
    00576     default: {
    00577 do_clear:;
    00578       CommandCost ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00579       if (CmdFailed(ret)) return ret;
    00580       cost.AddCost(ret);
    00581     } break;
    00582   }
    00583
    00584   if (other_bits != pieces) {
    00585     /* Check the foundation/slopes when adding road/tram bits */
    00586     CommandCost ret = CheckRoadSlope(tileh, &pieces, existing, other_bits);
    00587     /* Return an error if we need to build a foundation (ret != 0) but the
    00588      * current setting is turned off */
    00589     if (CmdFailed(ret) || (ret.GetCost() != 0 && !_settings_game.construction.build_on_slopes)) {
    00590       return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00591     }
    00592     cost.AddCost(ret);
    00593   }
    00594
    00595   if (IsTileType(tile, MP_ROAD)) {
    00596     /* Don't put the pieces that already exist */
    00597     pieces &= ComplementRoadBits(existing);
    00598
    00599     /* Check if new road bits will have the same foundation as other existing road types */
    00600     if (IsNormalRoad(tile)) {
    00601       Slope slope = GetTileSlope(tile, NULL);
    00602       Foundation found_new = GetRoadFoundation(slope, pieces | existing);
    00603
    00604       /* Test if all other roadtypes can be built at that foundation */
    00605       for (RoadType rtest = ROADTYPE_ROAD; rtest < ROADTYPE_END; rtest++) {
    00606         if (rtest != rt) { // check only other road types
    00607           RoadBits bits = GetRoadBits(tile, rtest);
    00608           /* do not check if there are not road bits of given type */
    00609           if (bits != ROAD_NONE && GetRoadFoundation(slope, bits) != found_new) {
    00610             return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00611           }
    00612         }
    00613       }
    00614     }
    00615   }
    00616
    00617   if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00618
    00619   cost.AddCost(CountBits(pieces) * _price.build_road);
    00620   if (IsTileType(tile, MP_TUNNELBRIDGE)) {
    00621     /* Pay for *every* tile of the bridge or tunnel */
    00622     cost.MultiplyCost(GetTunnelBridgeLength(GetOtherTunnelBridgeEnd(tile), tile) + 2);
    00623   }
    00624
    00625   if (flags & DC_EXEC) {
    00626     switch (GetTileType(tile)) {
    00627       case MP_ROAD: {
    00628         RoadTileType rtt = GetRoadTileType(tile);
    00629         if (existing == ROAD_NONE || rtt == ROAD_TILE_CROSSING) {
    00630           SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
    00631           SetRoadOwner(tile, rt, _current_company);
    00632           if (rt == ROADTYPE_ROAD) SetTownIndex(tile, p2);
    00633         }
    00634         if (rtt != ROAD_TILE_CROSSING) SetRoadBits(tile, existing | pieces, rt);
    00635       } break;
    00636
    00637       case MP_TUNNELBRIDGE: {
    00638         TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
    00639
    00640         SetRoadTypes(other_end, GetRoadTypes(other_end) | RoadTypeToRoadTypes(rt));
    00641         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
    00642
    00643         /* Mark tiles diry that have been repaved */
    00644         MarkTileDirtyByTile(other_end);
    00645         MarkTileDirtyByTile(tile);
    00646         if (IsBridge(tile)) {
    00647           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
    00648
    00649           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
    00650         }
    00651       } break;
    00652
    00653       case MP_STATION:
    00654         assert(IsDriveThroughStopTile(tile));
    00655         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
    00656         if (rt == ROADTYPE_ROAD) SetStopBuiltOnTownRoad(tile, false);
    00657         break;
    00658
    00659       default:
    00660         MakeRoadNormal(tile, pieces, RoadTypeToRoadTypes(rt), p2, _current_company, _current_company, _current_company);
    00661         break;
    00662     }
    00663
    00664     if (rt != ROADTYPE_TRAM && IsNormalRoadTile(tile)) {
    00665       existing |= pieces;
    00666       SetDisallowedRoadDirections(tile, IsStraightRoad(existing) ?
    00667           GetDisallowedRoadDirections(tile) ^ toggle_drd : DRD_NONE);
    00668     }
    00669
    00670     MarkTileDirtyByTile(tile);
    00671   }
    00672   return cost;
    00673 }
    00674
    00686 CommandCost CmdBuildLongRoad(TileIndex end_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00687 {
    00688   CommandCost cost(EXPENSES_CONSTRUCTION);
    00689   bool had_bridge = false;
    00690   bool had_tunnel = false;
    00691   bool had_success = false;
    00692   DisallowedRoadDirections drd = DRD_NORTHBOUND;
    00693
    00694   _error_message = INVALID_STRING_ID;
    00695
    00696   if (p1 >= MapSize()) return CMD_ERROR;
    00697
    00698   TileIndex start_tile = p1;
    00699   RoadType rt = (RoadType)GB(p2, 3, 2);
    00700   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
    00701
    00702   /* Only drag in X or Y direction dictated by the direction variable */
    00703   if (!HasBit(p2, 2) && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
    00704   if (HasBit(p2, 2)  && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
    00705
    00706   /* Swap start and ending tile, also the half-tile drag var (bit 0 and 1) */
    00707   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
    00708     TileIndex t = start_tile;
    00709     start_tile = end_tile;
    00710     end_tile = t;
    00711     p2 ^= IsInsideMM(p2 & 3, 1, 3) ? 3 : 0;
    00712     drd = DRD_SOUTHBOUND;
    00713   }
    00714
    00715   /* On the X-axis, we have to swap the initial bits, so they
    00716    * will be interpreted correctly in the GTTS. Futhermore
    00717    * when you just 'click' on one tile to build them. */
    00718   if (HasBit(p2, 2) == (start_tile == end_tile && HasBit(p2, 0) == HasBit(p2, 1))) drd ^= DRD_BOTH;
    00719   /* No disallowed direction bits have to be toggled */
    00720   if (!HasBit(p2, 5)) drd = DRD_NONE;
    00721
    00722   TileIndex tile = start_tile;
    00723   /* Start tile is the small number. */
    00724   for (;;) {
    00725     RoadBits bits = HasBit(p2, 2) ? ROAD_Y : ROAD_X;
    00726
    00727     if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
    00728     if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
    00729
    00730     _error_message = INVALID_STRING_ID;
    00731     CommandCost ret = DoCommand(tile, drd << 6 | rt << 4 | bits, 0, flags, CMD_BUILD_ROAD);
    00732     if (CmdFailed(ret)) {
    00733       if (_error_message != STR_1007_ALREADY_BUILT) return CMD_ERROR;
    00734     } else {
    00735       had_success = true;
    00736       /* Only pay for the upgrade on one side of the bridges and tunnels */
    00737       if (IsTileType(tile, MP_TUNNELBRIDGE)) {
    00738         if (IsBridge(tile)) {
    00739           if ((!had_bridge || GetTunnelBridgeDirection(tile) == DIAGDIR_SE || GetTunnelBridgeDirection(tile) == DIAGDIR_SW)) {
    00740             cost.AddCost(ret);
    00741           }
    00742           had_bridge = true;
    00743         } else { // IsTunnel(tile)
    00744           if ((!had_tunnel || GetTunnelBridgeDirection(tile) == DIAGDIR_SE || GetTunnelBridgeDirection(tile) == DIAGDIR_SW)) {
    00745             cost.AddCost(ret);
    00746           }
    00747           had_tunnel = true;
    00748         }
    00749       } else {
    00750         cost.AddCost(ret);
    00751       }
    00752     }
    00753
    00754     if (tile == end_tile) break;
    00755
    00756     tile += HasBit(p2, 2) ? TileDiffXY(0, 1) : TileDiffXY(1, 0);
    00757   }
    00758
    00759   return !had_success ? CMD_ERROR : cost;
    00760 }
    00761
    00772 CommandCost CmdRemoveLongRoad(TileIndex end_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00773 {
    00774   CommandCost cost(EXPENSES_CONSTRUCTION);
    00775
    00776   if (p1 >= MapSize()) return CMD_ERROR;
    00777
    00778   TileIndex start_tile = p1;
    00779   RoadType rt = (RoadType)GB(p2, 3, 2);
    00780   if (!IsValidRoadType(rt)) return CMD_ERROR;
    00781
    00782   /* Only drag in X or Y direction dictated by the direction variable */
    00783   if (!HasBit(p2, 2) && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
    00784   if (HasBit(p2, 2)  && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
    00785
    00786   /* Swap start and ending tile, also the half-tile drag var (bit 0 and 1) */
    00787   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
    00788     TileIndex t = start_tile;
    00789     start_tile = end_tile;
    00790     end_tile = t;
    00791     p2 ^= IsInsideMM(p2 & 3, 1, 3) ? 3 : 0;
    00792   }
    00793
    00794   Money money = GetAvailableMoneyForCommand();
    00795   TileIndex tile = start_tile;
    00796   /* Start tile is the small number. */
    00797   for (;;) {
    00798     RoadBits bits = HasBit(p2, 2) ? ROAD_Y : ROAD_X;
    00799
    00800     if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
    00801     if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
    00802
    00803     /* try to remove the halves. */
    00804     if (bits != 0) {
    00805       CommandCost ret = RemoveRoad(tile, flags & ~DC_EXEC, bits, rt, true);
    00806       if (CmdSucceeded(ret)) {
    00807         if (flags & DC_EXEC) {
    00808           money -= ret.GetCost();
    00809           if (money < 0) {
    00810             _additional_cash_required = DoCommand(end_tile, start_tile, p2, flags & ~DC_EXEC, CMD_REMOVE_LONG_ROAD).GetCost();
    00811             return cost;
    00812           }
    00813           RemoveRoad(tile, flags, bits, rt, true, false);
    00814         }
    00815         cost.AddCost(ret);
    00816       }
    00817     }
    00818
    00819     if (tile == end_tile) break;
    00820
    00821     tile += HasBit(p2, 2) ? TileDiffXY(0, 1) : TileDiffXY(1, 0);
    00822   }
    00823
    00824   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
    00825 }
    00826
    00837 CommandCost CmdBuildRoadDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00838 {
    00839   DiagDirection dir = Extract<DiagDirection, 0>(p1);
    00840   RoadType rt = (RoadType)GB(p1, 2, 2);
    00841
    00842   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
    00843
    00844   Slope tileh = GetTileSlope(tile, NULL);
    00845   if (tileh != SLOPE_FLAT && (
    00846         !_settings_game.construction.build_on_slopes ||
    00847         IsSteepSlope(tileh) ||
    00848         !CanBuildDepotByTileh(dir, tileh)
    00849       )) {
    00850     return_cmd_error(STR_0007_FLAT_LAND_REQUIRED);
    00851   }
    00852
    00853   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00854   if (CmdFailed(cost)) return CMD_ERROR;
    00855
    00856   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00857
    00858   if (!Depot::CanAllocateItem()) return CMD_ERROR;
    00859
    00860   if (flags & DC_EXEC) {
    00861     Depot *dep = new Depot(tile);
    00862     dep->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
    00863
    00864     MakeRoadDepot(tile, _current_company, dir, rt, dep->town_index);
    00865     MarkTileDirtyByTile(tile);
    00866   }
    00867   return cost.AddCost(_price.build_road_depot);
    00868 }
    00869
    00870 static CommandCost RemoveRoadDepot(TileIndex tile, DoCommandFlag flags)
    00871 {
    00872   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER) return CMD_ERROR;
    00873
    00874   if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00875
    00876   if (flags & DC_EXEC) {
    00877     DoClearSquare(tile);
    00878     delete GetDepotByTile(tile);
    00879   }
    00880
    00881   return CommandCost(EXPENSES_CONSTRUCTION, _price.remove_road_depot);
    00882 }
    00883
    00884 static CommandCost ClearTile_Road(TileIndex tile, DoCommandFlag flags)
    00885 {
    00886   switch (GetRoadTileType(tile)) {
    00887     case ROAD_TILE_NORMAL: {
    00888       RoadBits b = GetAllRoadBits(tile);
    00889
    00890       /* Clear the road if only one piece is on the tile OR we are not using the DC_AUTO flag */
    00891       if ((CountBits(b) == 1 && GetRoadBits(tile, ROADTYPE_TRAM) == ROAD_NONE) || !(flags & DC_AUTO)) {
    00892         RoadTypes rts = GetRoadTypes(tile);
    00893         CommandCost ret(EXPENSES_CONSTRUCTION);
    00894         for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
    00895           if (HasBit(rts, rt)) {
    00896             CommandCost tmp_ret = RemoveRoad(tile, flags, GetRoadBits(tile, rt), rt, true);
    00897             if (CmdFailed(tmp_ret)) return tmp_ret;
    00898             ret.AddCost(tmp_ret);
    00899           }
    00900         }
    00901         return ret;
    00902       }
    00903       return_cmd_error(STR_1801_MUST_REMOVE_ROAD_FIRST);
    00904     }
    00905
    00906     case ROAD_TILE_CROSSING: {
    00907       RoadTypes rts = GetRoadTypes(tile);
    00908       CommandCost ret(EXPENSES_CONSTRUCTION);
    00909
    00910       if (flags & DC_AUTO) return_cmd_error(STR_1801_MUST_REMOVE_ROAD_FIRST);
    00911
    00912       /* Must iterate over the roadtypes in a reverse manner because
    00913        * tram tracks must be removed before the road bits. */
    00914       RoadType rt = ROADTYPE_HWAY;
    00915       do {
    00916         if (HasBit(rts, rt)) {
    00917           CommandCost tmp_ret = RemoveRoad(tile, flags, GetCrossingRoadBits(tile), rt, false);
    00918           if (CmdFailed(tmp_ret)) return tmp_ret;
    00919           ret.AddCost(tmp_ret);
    00920         }
    00921       } while (rt-- != ROADTYPE_ROAD);
    00922
    00923       if (flags & DC_EXEC) {
    00924         DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00925       }
    00926       return ret;
    00927     }
    00928
    00929     default:
    00930     case ROAD_TILE_DEPOT:
    00931       if (flags & DC_AUTO) {
    00932         return_cmd_error(STR_2004_BUILDING_MUST_BE_DEMOLISHED);
    00933       }
    00934       return RemoveRoadDepot(tile, flags);
    00935   }
    00936 }
    00937
    00938
    00939 struct DrawRoadTileStruct {
    00940   uint16 image;
    00941   byte subcoord_x;
    00942   byte subcoord_y;
    00943 };
    00944
    00945 #include "table/road_land.h"
    00946
    00954 Foundation GetRoadFoundation(Slope tileh, RoadBits bits)
    00955 {
    00956   /* Flat land and land without a road doesn't require a foundation */
    00957   if (tileh == SLOPE_FLAT || bits == ROAD_NONE) return FOUNDATION_NONE;
    00958
    00959   if (!IsSteepSlope(tileh)) {
    00960     /* Leveled RoadBits on a slope */
    00961     if ((_invalid_tileh_slopes_road[0][tileh] & bits) == ROAD_NONE) return FOUNDATION_LEVELED;
    00962
    00963     /* Straight roads without foundation on a slope */
    00964     if (!IsSlopeWithOneCornerRaised(tileh) &&
    00965         (_invalid_tileh_slopes_road[1][tileh] & bits) == ROAD_NONE)
    00966       return FOUNDATION_NONE;
    00967   }
    00968
    00969   /* Roads on steep Slopes or on Slopes with one corner raised */
    00970   return (bits == ROAD_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
    00971 }
    00972
    00973 const byte _road_sloped_sprites[14] = {
    00974   0,  0,  2,  0,
    00975   0,  1,  0,  0,
    00976   3,  0,  0,  0,
    00977   0,  0
    00978 };
    00979
    00990 static bool AlwaysDrawUnpavedRoads(TileIndex tile, Roadside roadside)
    00991 {
    00992   return (IsOnSnow(tile) &&
    00993       !(_settings_game.game_creation.landscape == LT_TROPIC && HasGrfMiscBit(GMB_DESERT_PAVED_ROADS) &&
    00994         roadside != ROADSIDE_BARREN && roadside != ROADSIDE_GRASS && roadside != ROADSIDE_GRASS_ROAD_WORKS));
    00995 }
    00996
    01002 void DrawTramCatenary(const TileInfo *ti, RoadBits tram)
    01003 {
    01004   /* Do not draw catenary if it is invisible */
    01005   if (IsInvisibilitySet(TO_CATENARY)) return;
    01006
    01007   /* Don't draw the catenary under a low bridge */
    01008   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_CATENARY)) {
    01009     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
    01010
    01011     if (height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) return;
    01012   }
    01013
    01014   SpriteID front;
    01015   SpriteID back;
    01016
    01017   if (ti->tileh != SLOPE_FLAT) {
    01018     back  = SPR_TRAMWAY_BACK_WIRES_SLOPED  + _road_sloped_sprites[ti->tileh - 1];
    01019     front = SPR_TRAMWAY_FRONT_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
    01020   } else {
    01021     back  = SPR_TRAMWAY_BASE + _road_backpole_sprites_1[tram];
    01022     front = SPR_TRAMWAY_BASE + _road_frontwire_sprites_1[tram];
    01023   }
    01024
    01025   AddSortableSpriteToDraw(back,  PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
    01026   AddSortableSpriteToDraw(front, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
    01027 }
    01028
    01037 static void DrawRoadDetail(SpriteID img, const TileInfo *ti, int dx, int dy, int h)
    01038 {
    01039   int x = ti->x | dx;
    01040   int y = ti->y | dy;
    01041   byte z = ti->z;
    01042   if (ti->tileh != SLOPE_FLAT) z = GetSlopeZ(x, y);
    01043   AddSortableSpriteToDraw(img, PAL_NONE, x, y, 2, 2, h, z);
    01044 }
    01045
    01050 static void DrawRoadBits(TileInfo *ti)
    01051 {
    01052   RoadBits road = GetRoadBits(ti->tile, ROADTYPE_ROAD);
    01053   RoadBits tram = GetRoadBits(ti->tile, ROADTYPE_TRAM);
    01054
    01055   SpriteID image = 0;
    01056   SpriteID pal = PAL_NONE;
    01057
    01058   if (ti->tileh != SLOPE_FLAT) {
    01059     DrawFoundation(ti, GetRoadFoundation(ti->tileh, road | tram));
    01060
    01061     /* DrawFoundation() modifies ti.
    01062      * Default sloped sprites.. */
    01063     if (ti->tileh != SLOPE_FLAT) image = _road_sloped_sprites[ti->tileh - 1] + 0x53F;
    01064   }
    01065
    01066   if (image == 0) image = _road_tile_sprites_1[road != ROAD_NONE ? road : tram];
    01067
    01068   Roadside roadside = GetRoadside(ti->tile);
    01069
    01070   if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
    01071     image += 19;
    01072   } else {
    01073     switch (roadside) {
    01074       case ROADSIDE_BARREN:           pal = PALETTE_TO_BARE_LAND; break;
    01075       case ROADSIDE_GRASS:            break;
    01076       case ROADSIDE_GRASS_ROAD_WORKS: break;
    01077       default:                        image -= 19; break; // Paved
    01078     }
    01079   }
    01080
    01081   DrawGroundSprite(image, pal);
    01082
    01083   /* For tram we overlay the road graphics with either tram tracks only
    01084    * (when there is actual road beneath the trams) or with tram tracks
    01085    * and some dirts which hides the road graphics */
    01086   if (tram != ROAD_NONE) {
    01087     if (ti->tileh != SLOPE_FLAT) {
    01088       image = _road_sloped_sprites[ti->tileh - 1] + SPR_TRAMWAY_SLOPED_OFFSET;
    01089     } else {
    01090       image = _road_tile_sprites_1[tram] - SPR_ROAD_Y;
    01091     }
    01092     image += (road == ROAD_NONE) ? SPR_TRAMWAY_TRAM : SPR_TRAMWAY_OVERLAY;
    01093     DrawGroundSprite(image, pal);
    01094   }
    01095
    01096   if (road != ROAD_NONE) {
    01097     DisallowedRoadDirections drd = GetDisallowedRoadDirections(ti->tile);
    01098     if (drd != DRD_NONE) {
    01099       DrawRoadDetail(SPR_ONEWAY_BASE + drd - 1 + ((road == ROAD_X) ? 0 : 3), ti, 8, 8, 0);
    01100     }
    01101   }
    01102
    01103   if (HasRoadWorks(ti->tile)) {
    01104     /* Road works */
    01105     DrawGroundSprite((road | tram) & ROAD_X ? SPR_EXCAVATION_X : SPR_EXCAVATION_Y, PAL_NONE);
    01106     return;
    01107   }
    01108
    01109   if (tram != ROAD_NONE) DrawTramCatenary(ti, tram);
    01110
    01111   /* Return if full detail is disabled, or we are zoomed fully out. */
    01112   if (!HasBit(_display_opt, DO_FULL_DETAIL) || _cur_dpi->zoom > ZOOM_LVL_DETAIL) return;
    01113
    01114   /* Do not draw details (street lights, trees) under low bridge */
    01115   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && (roadside == ROADSIDE_TREES || roadside == ROADSIDE_STREET_LIGHTS)) {
    01116     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
    01117     uint minz = GetTileMaxZ(ti->tile) + 2 * TILE_HEIGHT;
    01118
    01119     if (roadside == ROADSIDE_TREES) minz += TILE_HEIGHT;
    01120
    01121     if (height < minz) return;
    01122   }
    01123
    01124   /* If there are no road bits, return, as there is nothing left to do */
    01125   if (CountBits(road) < 2) return;
    01126
    01127   /* Draw extra details. */
    01128   for (const DrawRoadTileStruct *drts = _road_display_table[roadside][road | tram]; drts->image != 0; drts++) {
    01129     DrawRoadDetail(drts->image, ti, drts->subcoord_x, drts->subcoord_y, 0x10);
    01130   }
    01131 }
    01132
    01134 static void DrawTile_Road(TileInfo *ti)
    01135 {
    01136   switch (GetRoadTileType(ti->tile)) {
    01137     case ROAD_TILE_NORMAL:
    01138       DrawRoadBits(ti);
    01139       break;
    01140
    01141     case ROAD_TILE_CROSSING: {
    01142       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
    01143
    01144       SpriteID image = GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.crossing;
    01145       SpriteID pal = PAL_NONE;
    01146
    01147       if (GetCrossingRoadAxis(ti->tile) == AXIS_X) image++;
    01148       if (IsCrossingBarred(ti->tile)) image += 2;
    01149
    01150       Roadside roadside = GetRoadside(ti->tile);
    01151
    01152       if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
    01153         image += 8;
    01154       } else {
    01155         switch (roadside) {
    01156           case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
    01157           case ROADSIDE_GRASS:  break;
    01158           default:              image += 4; break; // Paved
    01159         }
    01160       }
    01161
    01162       DrawGroundSprite(image, pal);
    01163
    01164       /* PBS debugging, draw reserved tracks darker */
    01165       if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && GetCrossingReservation(ti->tile)) {
    01166         DrawGroundSprite(GetCrossingRoadAxis(ti->tile) == AXIS_Y ? GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_y : GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_x, PALETTE_CRASH);
    01167       }
    01168
    01169       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
    01170         DrawGroundSprite(SPR_TRAMWAY_OVERLAY + (GetCrossingRoadAxis(ti->tile) ^ 1), pal);
    01171         DrawTramCatenary(ti, GetCrossingRoadBits(ti->tile));
    01172       }
    01173       if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    01174       break;
    01175     }
    01176
    01177     default:
    01178     case ROAD_TILE_DEPOT: {
    01179       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
    01180
    01181       SpriteID palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
    01182
    01183       const DrawTileSprites *dts;
    01184       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
    01185         dts =  &_tram_depot[GetRoadDepotDirection(ti->tile)];
    01186       } else {
    01187         dts =  &_road_depot[GetRoadDepotDirection(ti->tile)];
    01188       }
    01189
    01190       DrawGroundSprite(dts->ground.sprite, PAL_NONE);
    01191
    01192       /* End now if buildings are invisible */
    01193       if (IsInvisibilitySet(TO_BUILDINGS)) break;
    01194
    01195       for (const DrawTileSeqStruct *dtss = dts->seq; dtss->image.sprite != 0; dtss++) {
    01196         SpriteID image = dtss->image.sprite;
    01197         SpriteID pal;
    01198
    01199         if (!IsTransparencySet(TO_BUILDINGS) && HasBit(image, PALETTE_MODIFIER_COLOUR)) {
    01200           pal = palette;
    01201         } else {
    01202           pal = PAL_NONE;
    01203         }
    01204
    01205         AddSortableSpriteToDraw(
    01206           image, pal,
    01207           ti->x + dtss->delta_x, ti->y + dtss->delta_y,
    01208           dtss->size_x, dtss->size_y,
    01209           dtss->size_z, ti->z,
    01210           IsTransparencySet(TO_BUILDINGS)
    01211         );
    01212       }
    01213       break;
    01214     }
    01215   }
    01216   DrawBridgeMiddle(ti);
    01217 }
    01218
    01219 void DrawRoadDepotSprite(int x, int y, DiagDirection dir, RoadType rt)
    01220 {
    01221   SpriteID palette = COMPANY_SPRITE_COLOUR(_local_company);
    01222   const DrawTileSprites *dts = (rt == ROADTYPE_TRAM) ? &_tram_depot[dir] : &_road_depot[dir];
    01223
    01224   x += 33;
    01225   y += 17;
    01226
    01227   DrawSprite(dts->ground.sprite, PAL_NONE, x, y);
    01228
    01229   for (const DrawTileSeqStruct *dtss = dts->seq; dtss->image.sprite != 0; dtss++) {
    01230     Point pt = RemapCoords(dtss->delta_x, dtss->delta_y, dtss->delta_z);
    01231     SpriteID image = dtss->image.sprite;
    01232
    01233     DrawSprite(image, HasBit(image, PALETTE_MODIFIER_COLOUR) ? palette : PAL_NONE, x + pt.x, y + pt.y);
    01234   }
    01235 }
    01236
    01241 void UpdateNearestTownForRoadTiles(bool invalidate)
    01242 {
    01243   assert(!invalidate || _generating_world);
    01244
    01245   for (TileIndex t = 0; t < MapSize(); t++) {
    01246     if (IsTileType(t, MP_ROAD) && !HasTownOwnedRoad(t)) {
    01247       TownID tid = (TownID)INVALID_TOWN;
    01248       if (!invalidate) {
    01249         const Town *town = CalcClosestTownFromTile(t, UINT_MAX);
    01250         if (town != NULL) tid = town->index;
    01251       }
    01252       SetTownIndex(t, tid);
    01253     }
    01254   }
    01255 }
    01256
    01257 static uint GetSlopeZ_Road(TileIndex tile, uint x, uint y)
    01258 {
    01259   uint z;
    01260   Slope tileh = GetTileSlope(tile, &z);
    01261
    01262   if (tileh == SLOPE_FLAT) return z;
    01263   if (IsNormalRoad(tile)) {
    01264     Foundation f = GetRoadFoundation(tileh, GetAllRoadBits(tile));
    01265     z += ApplyFoundationToSlope(f, &tileh);
    01266     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
    01267   } else {
    01268     return z + TILE_HEIGHT;
    01269   }
    01270 }
    01271
    01272 static Foundation GetFoundation_Road(TileIndex tile, Slope tileh)
    01273 {
    01274   if (IsNormalRoad(tile)) {
    01275     return GetRoadFoundation(tileh, GetAllRoadBits(tile));
    01276   } else {
    01277     return FlatteningFoundation(tileh);
    01278   }
    01279 }
    01280
    01281 static void GetAcceptedCargo_Road(TileIndex tile, AcceptedCargo ac)
    01282 {
    01283   /* not used */
    01284 }
    01285
    01286 static void AnimateTile_Road(TileIndex tile)
    01287 {
    01288   if (IsLevelCrossing(tile)) MarkTileDirtyByTile(tile);
    01289 }
    01290
    01291
    01292 static const Roadside _town_road_types[][2] = {
    01293   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
    01294   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
    01295   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
    01296   { ROADSIDE_TREES,         ROADSIDE_TREES },
    01297   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
    01298 };
    01299
    01300 static const Roadside _town_road_types_2[][2] = {
    01301   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
    01302   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
    01303   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
    01304   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
    01305   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
    01306 };
    01307
    01308
    01309 static void TileLoop_Road(TileIndex tile)
    01310 {
    01311   switch (_settings_game.game_creation.landscape) {
    01312     case LT_ARCTIC:
    01313       if (IsOnSnow(tile) != (GetTileZ(tile) > GetSnowLine())) {
    01314         ToggleSnow(tile);
    01315         MarkTileDirtyByTile(tile);
    01316       }
    01317       break;
    01318
    01319     case LT_TROPIC:
    01320       if (GetTropicZone(tile) == TROPICZONE_DESERT && !IsOnDesert(tile)) {
    01321         ToggleDesert(tile);
    01322         MarkTileDirtyByTile(tile);
    01323       }
    01324       break;
    01325   }
    01326
    01327   if (IsRoadDepot(tile)) return;
    01328
    01329   const Town *t = ClosestTownFromTile(tile, UINT_MAX);
    01330   if (!HasRoadWorks(tile)) {
    01331     HouseZonesBits grp = HZB_TOWN_EDGE;
    01332
    01333     if (t != NULL) {
    01334       grp = GetTownRadiusGroup(t, tile);
    01335
    01336       /* Show an animation to indicate road work */
    01337       if (t->road_build_months != 0 &&
    01338           (DistanceManhattan(t->xy, tile) < 8 || grp != HZB_TOWN_EDGE) &&
    01339           IsNormalRoad(tile) && CountBits(GetAllRoadBits(tile)) > 1 ) {
    01340         if (GetFoundationSlope(tile, NULL) == SLOPE_FLAT && EnsureNoVehicleOnGround(tile) && Chance16(1, 40)) {
    01341           StartRoadWorks(tile);
    01342
    01343           SndPlayTileFx(SND_21_JACKHAMMER, tile);
    01344           CreateEffectVehicleAbove(
    01345             TileX(tile) * TILE_SIZE + 7,
    01346             TileY(tile) * TILE_SIZE + 7,
    01347             0,
    01348             EV_BULLDOZER);
    01349           MarkTileDirtyByTile(tile);
    01350           return;
    01351         }
    01352       }
    01353     }
    01354
    01355     {
    01356       /* Adjust road ground type depending on 'grp' (grp is the distance to the center) */
    01357       const Roadside *new_rs = (_settings_game.game_creation.landscape == LT_TOYLAND) ? _town_road_types_2[grp] : _town_road_types[grp];
    01358       Roadside cur_rs = GetRoadside(tile);
    01359
    01360       /* We have our desired type, do nothing */
    01361       if (cur_rs == new_rs[0]) return;
    01362
    01363       /* We have the pre-type of the desired type, switch to the desired type */
    01364       if (cur_rs == new_rs[1]) {
    01365         cur_rs = new_rs[0];
    01366       /* We have barren land, install the pre-type */
    01367       } else if (cur_rs == ROADSIDE_BARREN) {
    01368         cur_rs = new_rs[1];
    01369       /* We're totally off limits, remove any installation and make barren land */
    01370       } else {
    01371         cur_rs = ROADSIDE_BARREN;
    01372       }
    01373       SetRoadside(tile, cur_rs);
    01374       MarkTileDirtyByTile(tile);
    01375     }
    01376   } else if (IncreaseRoadWorksCounter(tile)) {
    01377     TerminateRoadWorks(tile);
    01378
    01379     if (_settings_game.economy.mod_road_rebuild) {
    01380       /* Generate a nicer town surface */
    01381       const RoadBits old_rb = GetAnyRoadBits(tile, ROADTYPE_ROAD);
    01382       const RoadBits new_rb = CleanUpRoadBits(tile, old_rb);
    01383
    01384       if (old_rb != new_rb) {
    01385         RemoveRoad(tile, DC_EXEC | DC_AUTO | DC_NO_WATER, (old_rb ^ new_rb), ROADTYPE_ROAD, true);
    01386       }
    01387     }
    01388
    01389     MarkTileDirtyByTile(tile);
    01390   }
    01391 }
    01392
    01393 static bool ClickTile_Road(TileIndex tile)
    01394 {
    01395   if (!IsRoadDepot(tile)) return false;
    01396
    01397   ShowDepotWindow(tile, VEH_ROAD);
    01398   return true;
    01399 }
    01400
    01401 /* Converts RoadBits to TrackBits */
    01402 static const byte _road_trackbits[16] = {
    01403   0x0, 0x0, 0x0, 0x10, 0x0, 0x2, 0x8, 0x1A, 0x0, 0x4, 0x1, 0x15, 0x20, 0x26, 0x29, 0x3F,
    01404 };
    01405
    01406 static TrackStatus GetTileTrackStatus_Road(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
    01407 {
    01408   TrackdirBits trackdirbits = TRACKDIR_BIT_NONE;
    01409   TrackdirBits red_signals = TRACKDIR_BIT_NONE; // crossing barred
    01410   switch (mode) {
    01411     case TRANSPORT_RAIL:
    01412       if (IsLevelCrossing(tile)) trackdirbits = TrackBitsToTrackdirBits(GetCrossingRailBits(tile));
    01413       break;
    01414
    01415     case TRANSPORT_ROAD:
    01416       if ((GetRoadTypes(tile) & sub_mode) == 0) break;
    01417       switch (GetRoadTileType(tile)) {
    01418         case ROAD_TILE_NORMAL: {
    01419           const uint drd_to_multiplier[DRD_END] = { 0x101, 0x100, 0x1, 0x0 };
    01420           RoadType rt = (RoadType)FindFirstBit(sub_mode);
    01421           RoadBits bits = GetRoadBits(tile, rt);
    01422
    01423           /* no roadbit at this side of tile, return 0 */
    01424           if (side != INVALID_DIAGDIR && (DiagDirToRoadBits(side) & bits) == 0) break;
    01425
    01426           uint multiplier = drd_to_multiplier[rt == ROADTYPE_TRAM ? DRD_NONE : GetDisallowedRoadDirections(tile)];
    01427           if (!HasRoadWorks(tile)) trackdirbits = (TrackdirBits)(_road_trackbits[bits] * multiplier);
    01428           break;
    01429         }
    01430
    01431         case ROAD_TILE_CROSSING: {
    01432           Axis axis = GetCrossingRoadAxis(tile);
    01433
    01434           if (side != INVALID_DIAGDIR && axis != DiagDirToAxis(side)) break;
    01435
    01436           trackdirbits = TrackBitsToTrackdirBits(AxisToTrackBits(axis));
    01437           if (IsCrossingBarred(tile)) red_signals = trackdirbits;
    01438           break;
    01439         }
    01440
    01441         default:
    01442         case ROAD_TILE_DEPOT: {
    01443           DiagDirection dir = GetRoadDepotDirection(tile);
    01444
    01445           if (side != INVALID_DIAGDIR && side != dir) break;
    01446
    01447           trackdirbits = TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir));
    01448           break;
    01449         }
    01450       }
    01451       break;
    01452
    01453     default: break;
    01454   }
    01455   return CombineTrackStatus(trackdirbits, red_signals);
    01456 }
    01457
    01458 static const StringID _road_tile_strings[] = {
    01459   STR_1814_ROAD,
    01460   STR_1814_ROAD,
    01461   STR_1814_ROAD,
    01462   STR_1815_ROAD_WITH_STREETLIGHTS,
    01463   STR_1814_ROAD,
    01464   STR_1816_TREE_LINED_ROAD,
    01465   STR_1814_ROAD,
    01466   STR_1814_ROAD,
    01467 };
    01468
    01469 static void GetTileDesc_Road(TileIndex tile, TileDesc *td)
    01470 {
    01471   Owner rail_owner = INVALID_OWNER;
    01472   Owner road_owner = INVALID_OWNER;
    01473   Owner tram_owner = INVALID_OWNER;
    01474
    01475   switch (GetRoadTileType(tile)) {
    01476     case ROAD_TILE_CROSSING: {
    01477       td->str = STR_1818_ROAD_RAIL_LEVEL_CROSSING;
    01478       RoadTypes rts = GetRoadTypes(tile);
    01479       rail_owner = GetTileOwner(tile);
    01480       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
    01481       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
    01482       break;
    01483     }
    01484
    01485     case ROAD_TILE_DEPOT:
    01486       td->str = STR_1817_ROAD_VEHICLE_DEPOT;
    01487       road_owner = GetTileOwner(tile); // Tile has only one owner, roadtype does not matter
    01488       break;
    01489
    01490     default: {
    01491       RoadTypes rts = GetRoadTypes(tile);
    01492       td->str = (HasBit(rts, ROADTYPE_ROAD) ? _road_tile_strings[GetRoadside(tile)] : STR_TRAMWAY);
    01493       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
    01494       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
    01495       break;
    01496     }
    01497   }
    01498
    01499   /* Now we have to discover, if the tile has only one owner or many:
    01500    *   - Find a first_owner of the tile. (Currently road or tram must be present, but this will break when the third type becomes available)
    01501    *   - Compare the found owner with the other owners, and test if they differ.
    01502    * Note: If road exists it will be the first_owner.
    01503    */
    01504   Owner first_owner = (road_owner == INVALID_OWNER ? tram_owner : road_owner);
    01505   bool mixed_owners = (tram_owner != INVALID_OWNER && tram_owner != first_owner) || (rail_owner != INVALID_OWNER && rail_owner != first_owner);
    01506
    01507   if (mixed_owners) {
    01508     /* Multiple owners */
    01509     td->owner_type[0] = (rail_owner == INVALID_OWNER ? STR_NULL : STR_RAIL_OWNER);
    01510     td->owner[0] = rail_owner;
    01511     td->owner_type[1] = (road_owner == INVALID_OWNER ? STR_NULL : STR_ROAD_OWNER);
    01512     td->owner[1] = road_owner;
    01513     td->owner_type[2] = (tram_owner == INVALID_OWNER ? STR_NULL : STR_TRAM_OWNER);
    01514     td->owner[2] = tram_owner;
    01515   } else {
    01516     /* One to rule them all */
    01517     td->owner[0] = first_owner;
    01518   }
    01519 }
    01520
    01525 static const byte _roadveh_enter_depot_dir[4] = {
    01526   TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE
    01527 };
    01528
    01529 static VehicleEnterTileStatus VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
    01530 {
    01531   switch (GetRoadTileType(tile)) {
    01532     case ROAD_TILE_CROSSING:
    01533       if (v->type == VEH_TRAIN) {
    01534         /* it should be barred */
    01535         assert(IsCrossingBarred(tile));
    01536       }
    01537       break;
    01538
    01539     case ROAD_TILE_DEPOT:
    01540       if (v->type == VEH_ROAD &&
    01541           v->u.road.frame == RVC_DEPOT_STOP_FRAME &&
    01542           _roadveh_enter_depot_dir[GetRoadDepotDirection(tile)] == v->u.road.state) {
    01543         v->u.road.state = RVSB_IN_DEPOT;
    01544         v->vehstatus |= VS_HIDDEN;
    01545         v->direction = ReverseDir(v->direction);
    01546         if (v->Next() == NULL) VehicleEnterDepot(v);
    01547         v->tile = tile;
    01548
    01549         InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
    01550         return VETSB_ENTERED_WORMHOLE;
    01551       }
    01552       break;
    01553
    01554     default: break;
    01555   }
    01556   return VETSB_CONTINUE;
    01557 }
    01558
    01559
    01560 static void ChangeTileOwner_Road(TileIndex tile, Owner old_owner, Owner new_owner)
    01561 {
    01562   if (IsRoadDepot(tile)) {
    01563     if (GetTileOwner(tile) == old_owner) {
    01564       if (new_owner == INVALID_OWNER) {
    01565         DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
    01566       } else {
    01567         SetTileOwner(tile, new_owner);
    01568       }
    01569     }
    01570     return;
    01571   }
    01572
    01573   for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
    01574     /* Update all roadtypes, no matter if they are present */
    01575     if (GetRoadOwner(tile, rt) == old_owner) {
    01576       SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
    01577     }
    01578   }
    01579
    01580   if (IsLevelCrossing(tile)) {
    01581     if (GetTileOwner(tile) == old_owner) {
    01582       if (new_owner == INVALID_OWNER) {
    01583         DoCommand(tile, 0, GetCrossingRailTrack(tile), DC_EXEC | DC_BANKRUPT, CMD_REMOVE_SINGLE_RAIL);
    01584       } else {
    01585         SetTileOwner(tile, new_owner);
    01586       }
    01587     }
    01588   }
    01589 }
    01590
    01591 static CommandCost TerraformTile_Road(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
    01592 {
    01593   if (_settings_game.construction.build_on_slopes && AutoslopeEnabled()) {
    01594     switch (GetRoadTileType(tile)) {
    01595       case ROAD_TILE_CROSSING:
    01596         if (!IsSteepSlope(tileh_new) && (GetTileMaxZ(tile) == z_new + GetSlopeMaxZ(tileh_new)) && HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    01597         break;
    01598
    01599       case ROAD_TILE_DEPOT:
    01600         if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRoadDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    01601         break;
    01602
    01603       case ROAD_TILE_NORMAL: {
    01604         RoadBits bits = GetAllRoadBits(tile);
    01605         RoadBits bits_copy = bits;
    01606         /* Check if the slope-road_bits combination is valid at all, i.e. it is safe to call GetRoadFoundation(). */
    01607         if (!CmdFailed(CheckRoadSlope(tileh_new, &bits_copy, ROAD_NONE, ROAD_NONE))) {
    01608           /* CheckRoadSlope() sometimes changes the road_bits, if it does not agree with them. */
    01609           if (bits == bits_copy) {
    01610             uint z_old;
    01611             Slope tileh_old = GetTileSlope(tile, &z_old);
    01612
    01613             /* Get the slope on top of the foundation */
    01614             z_old += ApplyFoundationToSlope(GetRoadFoundation(tileh_old, bits), &tileh_old);
    01615             z_new += ApplyFoundationToSlope(GetRoadFoundation(tileh_new, bits), &tileh_new);
    01616
    01617             /* The surface slope must not be changed */
    01618             if ((z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    01619           }
    01620         }
    01621         break;
    01622       }
    01623
    01624       default: NOT_REACHED();
    01625     }
    01626   }
    01627
    01628   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    01629 }
    01630
    01632 extern const TileTypeProcs _tile_type_road_procs = {
    01633   DrawTile_Road,           // draw_tile_proc
    01634   GetSlopeZ_Road,          // get_slope_z_proc
    01635   ClearTile_Road,          // clear_tile_proc
    01636   GetAcceptedCargo_Road,   // get_accepted_cargo_proc
    01637   GetTileDesc_Road,        // get_tile_desc_proc
    01638   GetTileTrackStatus_Road, // get_tile_track_status_proc
    01639   ClickTile_Road,          // click_tile_proc
    01640   AnimateTile_Road,        // animate_tile_proc
    01641   TileLoop_Road,           // tile_loop_clear
    01642   ChangeTileOwner_Road,    // change_tile_owner_clear
    01643   NULL,                    // get_produced_cargo_proc
    01644   VehicleEnter_Road,       // vehicle_enter_tile_proc
    01645   GetFoundation_Road,      // get_foundation_proc
    01646   TerraformTile_Road,      // terraform_tile_proc
    01647 };