road_cmd.cpp

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00001 /* $Id: road_cmd.cpp 23629 2011-12-19 21:02:33Z truebrain $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #include "stdafx.h"
00013 #include "cmd_helper.h"
00014 #include "road_internal.h"
00015 #include "viewport_func.h"
00016 #include "command_func.h"
00017 #include "pathfinder/yapf/yapf_cache.h"
00018 #include "depot_base.h"
00019 #include "newgrf.h"
00020 #include "autoslope.h"
00021 #include "tunnelbridge_map.h"
00022 #include "window_func.h"
00023 #include "strings_func.h"
00024 #include "vehicle_func.h"
00025 #include "sound_func.h"
00026 #include "tunnelbridge.h"
00027 #include "cheat_type.h"
00028 #include "effectvehicle_func.h"
00029 #include "effectvehicle_base.h"
00030 #include "elrail_func.h"
00031 #include "roadveh.h"
00032 #include "town.h"
00033 #include "company_base.h"
00034 #include "core/random_func.hpp"
00035 #include "newgrf_railtype.h"
00036 #include "date_func.h"
00037 #include "genworld.h"
00038 #include "company_gui.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 
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 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits);
00104 
00115 CommandCost 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 CommandCost();
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 && !Company::IsValidID(_current_company))) return CommandCost();
00124 
00125   /* Only do the special processing if the road is owned
00126    * by a town */
00127   if (owner != OWNER_TOWN) {
00128     if (owner == OWNER_NONE) return CommandCost();
00129     CommandCost ret = CheckOwnership(owner);
00130     return ret;
00131   }
00132 
00133   if (!town_check) return CommandCost();
00134 
00135   if (_cheats.magic_bulldozer.value) return CommandCost();
00136 
00137   Town *t = ClosestTownFromTile(tile, UINT_MAX);
00138   if (t == NULL) return CommandCost();
00139 
00140   /* check if you're allowed to remove the street owned by a town
00141    * removal allowance depends on difficulty setting */
00142   CommandCost ret = CheckforTownRating(flags, t, ROAD_REMOVE);
00143   if (ret.Failed()) return ret;
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       return_cmd_error(STR_ERROR_LOCAL_AUTHORITY_REFUSES_TO_ALLOW_THIS);
00161     }
00162     rating_decrease = RATING_ROAD_DOWN_STEP_INNER;
00163   }
00164   ChangeTownRating(t, rating_decrease, RATING_ROAD_MINIMUM, flags);
00165 
00166   return CommandCost();
00167 }
00168 
00169 
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(rt == ROADTYPE_TRAM ? STR_ERROR_THERE_IS_NO_TRAMWAY : STR_ERROR_THERE_IS_NO_ROAD);
00184 
00185   switch (GetTileType(tile)) {
00186     case MP_ROAD: {
00187       CommandCost ret = EnsureNoVehicleOnGround(tile);
00188       if (ret.Failed()) return ret;
00189       break;
00190     }
00191 
00192     case MP_STATION: {
00193       if (!IsDriveThroughStopTile(tile)) return CMD_ERROR;
00194 
00195       CommandCost ret = EnsureNoVehicleOnGround(tile);
00196       if (ret.Failed()) return ret;
00197       break;
00198     }
00199 
00200     case MP_TUNNELBRIDGE: {
00201       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) return CMD_ERROR;
00202       CommandCost ret = TunnelBridgeIsFree(tile, GetOtherTunnelBridgeEnd(tile));
00203       if (ret.Failed()) return ret;
00204       break;
00205     }
00206 
00207     default:
00208       return CMD_ERROR;
00209   }
00210 
00211   CommandCost ret = CheckAllowRemoveRoad(tile, pieces, GetRoadOwner(tile, rt), rt, flags, town_check);
00212   if (ret.Failed()) return ret;
00213 
00214   if (!IsTileType(tile, MP_ROAD)) {
00215     /* If it's the last roadtype, just clear the whole tile */
00216     if (rts == RoadTypeToRoadTypes(rt)) return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00217 
00218     CommandCost cost(EXPENSES_CONSTRUCTION);
00219     if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00220       TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
00221       /* Pay for *every* tile of the bridge or tunnel */
00222       uint len = GetTunnelBridgeLength(other_end, tile) + 2;
00223       cost.AddCost(len * _price[PR_CLEAR_ROAD]);
00224       if (flags & DC_EXEC) {
00225         Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
00226         if (c != NULL) {
00227           /* A full diagonal road tile has two road bits. */
00228           c->infrastructure.road[rt] -= len * 2 * TUNNELBRIDGE_TRACKBIT_FACTOR;
00229           DirtyCompanyInfrastructureWindows(c->index);
00230         }
00231 
00232         SetRoadTypes(other_end, GetRoadTypes(other_end) & ~RoadTypeToRoadTypes(rt));
00233         SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
00234 
00235         /* If the owner of the bridge sells all its road, also move the ownership
00236          * to the owner of the other roadtype. */
00237         RoadType other_rt = (rt == ROADTYPE_ROAD) ? ROADTYPE_TRAM : ROADTYPE_ROAD;
00238         Owner other_owner = GetRoadOwner(tile, other_rt);
00239         if (other_owner != GetTileOwner(tile)) {
00240           SetTileOwner(tile, other_owner);
00241           SetTileOwner(other_end, other_owner);
00242         }
00243 
00244         /* Mark tiles dirty that have been repaved */
00245         MarkTileDirtyByTile(tile);
00246         MarkTileDirtyByTile(other_end);
00247         if (IsBridge(tile)) {
00248           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
00249 
00250           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
00251         }
00252       }
00253     } else {
00254       assert(IsDriveThroughStopTile(tile));
00255       cost.AddCost(_price[PR_CLEAR_ROAD] * 2);
00256       if (flags & DC_EXEC) {
00257         Company *c = Company::GetIfValid(GetTileOwner(tile));
00258         if (c != NULL) {
00259           /* A full diagonal road tile has two road bits. */
00260           c->infrastructure.road[rt] -= 2;
00261           DirtyCompanyInfrastructureWindows(c->index);
00262         }
00263         SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
00264         MarkTileDirtyByTile(tile);
00265       }
00266     }
00267     return cost;
00268   }
00269 
00270   switch (GetRoadTileType(tile)) {
00271     case ROAD_TILE_NORMAL: {
00272       Slope tileh = GetTileSlope(tile);
00273 
00274       /* Steep slopes behave the same as slopes with one corner raised. */
00275       if (IsSteepSlope(tileh)) {
00276         tileh = SlopeWithOneCornerRaised(GetHighestSlopeCorner(tileh));
00277       }
00278 
00279       RoadBits present = GetRoadBits(tile, rt);
00280       const RoadBits other = GetOtherRoadBits(tile, rt);
00281       const Foundation f = GetRoadFoundation(tileh, present);
00282 
00283       if (HasRoadWorks(tile) && _current_company != OWNER_WATER) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00284 
00285       /* Autocomplete to a straight road
00286        * @li if the bits of the other roadtypes result in another foundation
00287        * @li if build on slopes is disabled */
00288       if ((IsStraightRoad(other) && (other & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) != ROAD_NONE) ||
00289           (tileh != SLOPE_FLAT && !_settings_game.construction.build_on_slopes)) {
00290         pieces |= MirrorRoadBits(pieces);
00291       }
00292 
00293       /* limit the bits to delete to the existing bits. */
00294       pieces &= present;
00295       if (pieces == ROAD_NONE) return_cmd_error(rt == ROADTYPE_TRAM ? STR_ERROR_THERE_IS_NO_TRAMWAY : STR_ERROR_THERE_IS_NO_ROAD);
00296 
00297       /* Now set present what it will be after the remove */
00298       present ^= pieces;
00299 
00300       /* Check for invalid RoadBit combinations on slopes */
00301       if (tileh != SLOPE_FLAT && present != ROAD_NONE &&
00302           (present & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) == present) {
00303         return CMD_ERROR;
00304       }
00305 
00306       if (flags & DC_EXEC) {
00307         if (HasRoadWorks(tile)) {
00308           /* flooding tile with road works, don't forget to remove the effect vehicle too */
00309           assert(_current_company == OWNER_WATER);
00310           EffectVehicle *v;
00311           FOR_ALL_EFFECTVEHICLES(v) {
00312             if (TileVirtXY(v->x_pos, v->y_pos) == tile) {
00313               delete v;
00314             }
00315           }
00316         }
00317 
00318         Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
00319         if (c != NULL) {
00320           c->infrastructure.road[rt] -= CountBits(pieces);
00321           DirtyCompanyInfrastructureWindows(c->index);
00322         }
00323 
00324         if (present == ROAD_NONE) {
00325           RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));
00326           if (rts == ROADTYPES_NONE) {
00327             /* Includes MarkTileDirtyByTile() */
00328             DoClearSquare(tile);
00329           } else {
00330             if (rt == ROADTYPE_ROAD && IsRoadOwner(tile, ROADTYPE_ROAD, OWNER_TOWN)) {
00331               /* Update nearest-town index */
00332               const Town *town = CalcClosestTownFromTile(tile);
00333               SetTownIndex(tile, town == NULL ? (TownID)INVALID_TOWN : town->index);
00334             }
00335             SetRoadBits(tile, ROAD_NONE, rt);
00336             SetRoadTypes(tile, rts);
00337             MarkTileDirtyByTile(tile);
00338           }
00339         } else {
00340           /* When bits are removed, you *always* end up with something that
00341            * is not a complete straight road tile. However, trams do not have
00342            * onewayness, so they cannot remove it either. */
00343           if (rt != ROADTYPE_TRAM) SetDisallowedRoadDirections(tile, DRD_NONE);
00344           SetRoadBits(tile, present, rt);
00345           MarkTileDirtyByTile(tile);
00346         }
00347       }
00348 
00349       CommandCost cost(EXPENSES_CONSTRUCTION, CountBits(pieces) * _price[PR_CLEAR_ROAD]);
00350       /* If we build a foundation we have to pay for it. */
00351       if (f == FOUNDATION_NONE && GetRoadFoundation(tileh, present) != FOUNDATION_NONE) cost.AddCost(_price[PR_BUILD_FOUNDATION]);
00352 
00353       return cost;
00354     }
00355 
00356     case ROAD_TILE_CROSSING: {
00357       if (pieces & ComplementRoadBits(GetCrossingRoadBits(tile))) {
00358         return CMD_ERROR;
00359       }
00360 
00361       /* Don't allow road to be removed from the crossing when there is tram;
00362        * we can't draw the crossing without roadbits ;) */
00363       if (rt == ROADTYPE_ROAD && HasTileRoadType(tile, ROADTYPE_TRAM) && (flags & DC_EXEC || crossing_check)) return CMD_ERROR;
00364 
00365       if (flags & DC_EXEC) {
00366         Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
00367         if (c != NULL) {
00368           /* A full diagonal road tile has two road bits. */
00369           c->infrastructure.road[rt] -= 2;
00370           DirtyCompanyInfrastructureWindows(c->index);
00371         }
00372 
00373         Track railtrack = GetCrossingRailTrack(tile);
00374         RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));
00375         if (rts == ROADTYPES_NONE) {
00376           TrackBits tracks = GetCrossingRailBits(tile);
00377           bool reserved = HasCrossingReservation(tile);
00378           MakeRailNormal(tile, GetTileOwner(tile), tracks, GetRailType(tile));
00379           if (reserved) SetTrackReservation(tile, tracks);
00380 
00381           /* Update rail count for level crossings. The plain track should still be accounted
00382            * for, so only subtract the difference to the level crossing cost. */
00383           c = Company::GetIfValid(GetTileOwner(tile));
00384           if (c != NULL) c->infrastructure.rail[GetRailType(tile)] -= LEVELCROSSING_TRACKBIT_FACTOR - 1;
00385         } else {
00386           SetRoadTypes(tile, rts);
00387           /* If we ever get HWAY and it is possible without road then we will need to promote ownership and invalidate town index here, too */
00388         }
00389         MarkTileDirtyByTile(tile);
00390         YapfNotifyTrackLayoutChange(tile, railtrack);
00391       }
00392       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_ROAD] * 2);
00393     }
00394 
00395     default:
00396     case ROAD_TILE_DEPOT:
00397       return CMD_ERROR;
00398   }
00399 }
00400 
00401 
00413 static CommandCost CheckRoadSlope(Slope tileh, RoadBits *pieces, RoadBits existing, RoadBits other)
00414 {
00415   /* Remove already build pieces */
00416   CLRBITS(*pieces, existing);
00417 
00418   /* If we can't build anything stop here */
00419   if (*pieces == ROAD_NONE) return CMD_ERROR;
00420 
00421   /* All RoadBit combos are valid on flat land */
00422   if (tileh == SLOPE_FLAT) return CommandCost();
00423 
00424   /* Steep slopes behave the same as slopes with one corner raised. */
00425   if (IsSteepSlope(tileh)) {
00426     tileh = SlopeWithOneCornerRaised(GetHighestSlopeCorner(tileh));
00427   }
00428 
00429   /* Save the merge of all bits of the current type */
00430   RoadBits type_bits = existing | *pieces;
00431 
00432   /* Roads on slopes */
00433   if (_settings_game.construction.build_on_slopes && (_invalid_tileh_slopes_road[0][tileh] & (other | type_bits)) == ROAD_NONE) {
00434 
00435     /* If we add leveling we've got to pay for it */
00436     if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00437 
00438     return CommandCost();
00439   }
00440 
00441   /* Autocomplete uphill roads */
00442   *pieces |= MirrorRoadBits(*pieces);
00443   type_bits = existing | *pieces;
00444 
00445   /* Uphill roads */
00446   if (IsStraightRoad(type_bits) && (other == type_bits || other == ROAD_NONE) &&
00447       (_invalid_tileh_slopes_road[1][tileh] & (other | type_bits)) == ROAD_NONE) {
00448 
00449     /* Slopes with foundation ? */
00450     if (IsSlopeWithOneCornerRaised(tileh)) {
00451 
00452       /* Prevent build on slopes if it isn't allowed */
00453       if (_settings_game.construction.build_on_slopes) {
00454 
00455         /* If we add foundation we've got to pay for it */
00456         if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00457 
00458         return CommandCost();
00459       }
00460     } else {
00461       if (HasExactlyOneBit(existing) && GetRoadFoundation(tileh, existing) == FOUNDATION_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00462       return CommandCost();
00463     }
00464   }
00465   return CMD_ERROR;
00466 }
00467 
00479 CommandCost CmdBuildRoad(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00480 {
00481   CompanyID company = _current_company;
00482   CommandCost cost(EXPENSES_CONSTRUCTION);
00483 
00484   RoadBits existing = ROAD_NONE;
00485   RoadBits other_bits = ROAD_NONE;
00486 
00487   /* Road pieces are max 4 bitset values (NE, NW, SE, SW) and town can only be non-zero
00488    * if a non-company is building the road */
00489   if ((Company::IsValidID(company) && p2 != 0) || (company == OWNER_TOWN && !Town::IsValidID(p2)) || (company == OWNER_DEITY && p2 != 0)) return CMD_ERROR;
00490   if (company != OWNER_TOWN) {
00491     const Town *town = CalcClosestTownFromTile(tile);
00492     p2 = (town != NULL) ? town->index : (TownID)INVALID_TOWN;
00493 
00494     if (company == OWNER_DEITY) {
00495       company = OWNER_TOWN;
00496 
00497       /* If we are not within a town, we are not owned by the town */
00498       if (town == NULL || DistanceSquare(tile, town->xy) > town->squared_town_zone_radius[HZB_TOWN_EDGE]) {
00499         company = OWNER_NONE;
00500       }
00501     }
00502   }
00503 
00504   RoadBits pieces = Extract<RoadBits, 0, 4>(p1);
00505 
00506   /* do not allow building 'zero' road bits, code wouldn't handle it */
00507   if (pieces == ROAD_NONE) return CMD_ERROR;
00508 
00509   RoadType rt = Extract<RoadType, 4, 2>(p1);
00510   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00511 
00512   DisallowedRoadDirections toggle_drd = Extract<DisallowedRoadDirections, 6, 2>(p1);
00513 
00514   Slope tileh = GetTileSlope(tile);
00515 
00516   bool need_to_clear = false;
00517   switch (GetTileType(tile)) {
00518     case MP_ROAD:
00519       switch (GetRoadTileType(tile)) {
00520         case ROAD_TILE_NORMAL: {
00521           if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00522 
00523           other_bits = GetOtherRoadBits(tile, rt);
00524           if (!HasTileRoadType(tile, rt)) break;
00525 
00526           existing = GetRoadBits(tile, rt);
00527           bool crossing = !IsStraightRoad(existing | pieces);
00528           if (rt != ROADTYPE_TRAM && (GetDisallowedRoadDirections(tile) != DRD_NONE || toggle_drd != DRD_NONE) && crossing) {
00529             /* Junctions cannot be one-way */
00530             return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
00531           }
00532           if ((existing & pieces) == pieces) {
00533             /* We only want to set the (dis)allowed road directions */
00534             if (toggle_drd != DRD_NONE && rt != ROADTYPE_TRAM) {
00535               if (crossing) return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
00536 
00537               Owner owner = GetRoadOwner(tile, ROADTYPE_ROAD);
00538               if (owner != OWNER_NONE) {
00539                 CommandCost ret = CheckOwnership(owner, tile);
00540                 if (ret.Failed()) return ret;
00541               }
00542 
00543               DisallowedRoadDirections dis_existing = GetDisallowedRoadDirections(tile);
00544               DisallowedRoadDirections dis_new      = dis_existing ^ toggle_drd;
00545 
00546               /* We allow removing disallowed directions to break up
00547                * deadlocks, but adding them can break articulated
00548                * vehicles. As such, only when less is disallowed,
00549                * i.e. bits are removed, we skip the vehicle check. */
00550               if (CountBits(dis_existing) <= CountBits(dis_new)) {
00551                 CommandCost ret = EnsureNoVehicleOnGround(tile);
00552                 if (ret.Failed()) return ret;
00553               }
00554 
00555               /* Ignore half built tiles */
00556               if ((flags & DC_EXEC) && rt != ROADTYPE_TRAM && IsStraightRoad(existing)) {
00557                 SetDisallowedRoadDirections(tile, dis_new);
00558                 MarkTileDirtyByTile(tile);
00559               }
00560               return CommandCost();
00561             }
00562             return_cmd_error(STR_ERROR_ALREADY_BUILT);
00563           }
00564           break;
00565         }
00566 
00567         case ROAD_TILE_CROSSING:
00568           other_bits = GetCrossingRoadBits(tile);
00569           if (pieces & ComplementRoadBits(other_bits)) goto do_clear;
00570           pieces = other_bits; // we need to pay for both roadbits
00571 
00572           if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00573           break;
00574 
00575         case ROAD_TILE_DEPOT:
00576           if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00577           goto do_clear;
00578 
00579         default: NOT_REACHED();
00580       }
00581       break;
00582 
00583     case MP_RAILWAY: {
00584       if (IsSteepSlope(tileh)) {
00585         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00586       }
00587 
00588       /* Level crossings may only be built on these slopes */
00589       if (!HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh)) {
00590         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00591       }
00592 
00593       if (GetRailTileType(tile) != RAIL_TILE_NORMAL) goto do_clear;
00594 
00595       if (RailNoLevelCrossings(GetRailType(tile))) {
00596         return_cmd_error(STR_ERROR_CROSSING_DISALLOWED);
00597       }
00598 
00599       Axis roaddir;
00600       switch (GetTrackBits(tile)) {
00601         case TRACK_BIT_X:
00602           if (pieces & ROAD_X) goto do_clear;
00603           roaddir = AXIS_Y;
00604           break;
00605 
00606         case TRACK_BIT_Y:
00607           if (pieces & ROAD_Y) goto do_clear;
00608           roaddir = AXIS_X;
00609           break;
00610 
00611         default: goto do_clear;
00612       }
00613 
00614       CommandCost ret = EnsureNoVehicleOnGround(tile);
00615       if (ret.Failed()) return ret;
00616 
00617       if (flags & DC_EXEC) {
00618         Track railtrack = AxisToTrack(OtherAxis(roaddir));
00619         YapfNotifyTrackLayoutChange(tile, railtrack);
00620         /* Update company infrastructure counts. A level crossing has two road bits. */
00621         Company *c = Company::GetIfValid(company);
00622         if (c != NULL) {
00623           c->infrastructure.road[rt] += 2;
00624           if (rt != ROADTYPE_ROAD) c->infrastructure.road[ROADTYPE_ROAD] += 2;
00625           DirtyCompanyInfrastructureWindows(company);
00626         }
00627         /* Update rail count for level crossings. The plain track is already
00628          * counted, so only add the difference to the level crossing cost. */
00629         c = Company::GetIfValid(GetTileOwner(tile));
00630         if (c != NULL) c->infrastructure.rail[GetRailType(tile)] += LEVELCROSSING_TRACKBIT_FACTOR - 1;
00631 
00632         /* Always add road to the roadtypes (can't draw without it) */
00633         bool reserved = HasBit(GetRailReservationTrackBits(tile), railtrack);
00634         MakeRoadCrossing(tile, company, company, GetTileOwner(tile), roaddir, GetRailType(tile), RoadTypeToRoadTypes(rt) | ROADTYPES_ROAD, p2);
00635         SetCrossingReservation(tile, reserved);
00636         UpdateLevelCrossing(tile, false);
00637         MarkTileDirtyByTile(tile);
00638       }
00639       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_ROAD] * (rt == ROADTYPE_ROAD ? 2 : 4));
00640     }
00641 
00642     case MP_STATION: {
00643       if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00644       if (!IsDriveThroughStopTile(tile)) goto do_clear;
00645 
00646       RoadBits curbits = AxisToRoadBits(DiagDirToAxis(GetRoadStopDir(tile)));
00647       if (pieces & ~curbits) goto do_clear;
00648       pieces = curbits; // we need to pay for both roadbits
00649 
00650       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00651       break;
00652     }
00653 
00654     case MP_TUNNELBRIDGE: {
00655       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) goto do_clear;
00656       if (MirrorRoadBits(DiagDirToRoadBits(GetTunnelBridgeDirection(tile))) != pieces) goto do_clear;
00657       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00658       /* Don't allow adding roadtype to the bridge/tunnel when vehicles are already driving on it */
00659       CommandCost ret = TunnelBridgeIsFree(tile, GetOtherTunnelBridgeEnd(tile));
00660       if (ret.Failed()) return ret;
00661       break;
00662     }
00663 
00664     default: {
00665 do_clear:;
00666       need_to_clear = true;
00667       break;
00668     }
00669   }
00670 
00671   if (need_to_clear) {
00672     CommandCost ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00673     if (ret.Failed()) return ret;
00674     cost.AddCost(ret);
00675   }
00676 
00677   if (other_bits != pieces) {
00678     /* Check the foundation/slopes when adding road/tram bits */
00679     CommandCost ret = CheckRoadSlope(tileh, &pieces, existing, other_bits);
00680     /* Return an error if we need to build a foundation (ret != 0) but the
00681      * current setting is turned off */
00682     if (ret.Failed() || (ret.GetCost() != 0 && !_settings_game.construction.build_on_slopes)) {
00683       return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00684     }
00685     cost.AddCost(ret);
00686   }
00687 
00688   if (!need_to_clear) {
00689     if (IsTileType(tile, MP_ROAD)) {
00690       /* Don't put the pieces that already exist */
00691       pieces &= ComplementRoadBits(existing);
00692 
00693       /* Check if new road bits will have the same foundation as other existing road types */
00694       if (IsNormalRoad(tile)) {
00695         Slope slope = GetTileSlope(tile);
00696         Foundation found_new = GetRoadFoundation(slope, pieces | existing);
00697 
00698         /* Test if all other roadtypes can be built at that foundation */
00699         for (RoadType rtest = ROADTYPE_ROAD; rtest < ROADTYPE_END; rtest++) {
00700           if (rtest != rt) { // check only other road types
00701             RoadBits bits = GetRoadBits(tile, rtest);
00702             /* do not check if there are not road bits of given type */
00703             if (bits != ROAD_NONE && GetRoadFoundation(slope, bits) != found_new) {
00704               return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00705             }
00706           }
00707         }
00708       }
00709     }
00710 
00711     CommandCost ret = EnsureNoVehicleOnGround(tile);
00712     if (ret.Failed()) return ret;
00713 
00714   }
00715 
00716   uint num_pieces = (!need_to_clear && IsTileType(tile, MP_TUNNELBRIDGE)) ?
00717       /* There are 2 pieces on *every* tile of the bridge or tunnel */
00718       2 * (GetTunnelBridgeLength(GetOtherTunnelBridgeEnd(tile), tile) + 2) :
00719       /* Count pieces */
00720       CountBits(pieces);
00721 
00722   cost.AddCost(num_pieces * _price[PR_BUILD_ROAD]);
00723 
00724   if (flags & DC_EXEC) {
00725     switch (GetTileType(tile)) {
00726       case MP_ROAD: {
00727         RoadTileType rtt = GetRoadTileType(tile);
00728         if (existing == ROAD_NONE || rtt == ROAD_TILE_CROSSING) {
00729           SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00730           SetRoadOwner(tile, rt, company);
00731           if (rt == ROADTYPE_ROAD) SetTownIndex(tile, p2);
00732         }
00733         if (rtt != ROAD_TILE_CROSSING) SetRoadBits(tile, existing | pieces, rt);
00734         break;
00735       }
00736 
00737       case MP_TUNNELBRIDGE: {
00738         TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
00739 
00740         SetRoadTypes(other_end, GetRoadTypes(other_end) | RoadTypeToRoadTypes(rt));
00741         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00742         SetRoadOwner(other_end, rt, company);
00743         SetRoadOwner(tile, rt, company);
00744 
00745         /* Mark tiles dirty that have been repaved */
00746         MarkTileDirtyByTile(other_end);
00747         MarkTileDirtyByTile(tile);
00748         if (IsBridge(tile)) {
00749           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
00750 
00751           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
00752         }
00753         break;
00754       }
00755 
00756       case MP_STATION:
00757         assert(IsDriveThroughStopTile(tile));
00758         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00759         SetRoadOwner(tile, rt, company);
00760         break;
00761 
00762       default:
00763         MakeRoadNormal(tile, pieces, RoadTypeToRoadTypes(rt), p2, company, company);
00764         break;
00765     }
00766 
00767     /* Update company infrastructure count. */
00768     Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
00769     if (c != NULL) {
00770       if (IsTileType(tile, MP_TUNNELBRIDGE)) num_pieces *= TUNNELBRIDGE_TRACKBIT_FACTOR;
00771       c->infrastructure.road[rt] += num_pieces;
00772       DirtyCompanyInfrastructureWindows(c->index);
00773     }
00774 
00775     if (rt != ROADTYPE_TRAM && IsNormalRoadTile(tile)) {
00776       existing |= pieces;
00777       SetDisallowedRoadDirections(tile, IsStraightRoad(existing) ?
00778           GetDisallowedRoadDirections(tile) ^ toggle_drd : DRD_NONE);
00779     }
00780 
00781     MarkTileDirtyByTile(tile);
00782   }
00783   return cost;
00784 }
00785 
00801 CommandCost CmdBuildLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00802 {
00803   DisallowedRoadDirections drd = DRD_NORTHBOUND;
00804 
00805   if (p1 >= MapSize()) return CMD_ERROR;
00806 
00807   TileIndex end_tile = p1;
00808   RoadType rt = Extract<RoadType, 3, 2>(p2);
00809   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00810 
00811   Axis axis = Extract<Axis, 2, 1>(p2);
00812   /* Only drag in X or Y direction dictated by the direction variable */
00813   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00814   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00815 
00816   DiagDirection dir = AxisToDiagDir(axis);
00817 
00818   /* Swap direction, also the half-tile drag var (bit 0 and 1) */
00819   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00820     dir = ReverseDiagDir(dir);
00821     p2 ^= 3;
00822     drd = DRD_SOUTHBOUND;
00823   }
00824 
00825   /* On the X-axis, we have to swap the initial bits, so they
00826    * will be interpreted correctly in the GTTS. Furthermore
00827    * when you just 'click' on one tile to build them. */
00828   if ((axis == AXIS_Y) == (start_tile == end_tile && HasBit(p2, 0) == HasBit(p2, 1))) drd ^= DRD_BOTH;
00829   /* No disallowed direction bits have to be toggled */
00830   if (!HasBit(p2, 5)) drd = DRD_NONE;
00831 
00832   CommandCost cost(EXPENSES_CONSTRUCTION);
00833   CommandCost last_error = CMD_ERROR;
00834   TileIndex tile = start_tile;
00835   bool had_bridge = false;
00836   bool had_tunnel = false;
00837   bool had_success = false;
00838   /* Start tile is the first tile clicked by the user. */
00839   for (;;) {
00840     RoadBits bits = AxisToRoadBits(axis);
00841 
00842     /* Road parts only have to be built at the start tile or at the end tile. */
00843     if (tile == end_tile && !HasBit(p2, 1)) bits &= DiagDirToRoadBits(ReverseDiagDir(dir));
00844     if (tile == start_tile && HasBit(p2, 0)) bits &= DiagDirToRoadBits(dir);
00845 
00846     CommandCost ret = DoCommand(tile, drd << 6 | rt << 4 | bits, 0, flags, CMD_BUILD_ROAD);
00847     if (ret.Failed()) {
00848       last_error = ret;
00849       if (last_error.GetErrorMessage() != STR_ERROR_ALREADY_BUILT) {
00850         if (HasBit(p2, 6)) return last_error;
00851         break;
00852       }
00853     } else {
00854       had_success = true;
00855       /* Only pay for the upgrade on one side of the bridges and tunnels */
00856       if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00857         if (IsBridge(tile)) {
00858           if (!had_bridge || GetTunnelBridgeDirection(tile) == dir) {
00859             cost.AddCost(ret);
00860           }
00861           had_bridge = true;
00862         } else { // IsTunnel(tile)
00863           if (!had_tunnel || GetTunnelBridgeDirection(tile) == dir) {
00864             cost.AddCost(ret);
00865           }
00866           had_tunnel = true;
00867         }
00868       } else {
00869         cost.AddCost(ret);
00870       }
00871     }
00872 
00873     if (tile == end_tile) break;
00874 
00875     tile += TileOffsByDiagDir(dir);
00876   }
00877 
00878   return had_success ? cost : last_error;
00879 }
00880 
00894 CommandCost CmdRemoveLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00895 {
00896   CommandCost cost(EXPENSES_CONSTRUCTION);
00897 
00898   if (p1 >= MapSize()) return CMD_ERROR;
00899 
00900   TileIndex end_tile = p1;
00901   RoadType rt = Extract<RoadType, 3, 2>(p2);
00902   if (!IsValidRoadType(rt)) return CMD_ERROR;
00903 
00904   Axis axis = Extract<Axis, 2, 1>(p2);
00905   /* Only drag in X or Y direction dictated by the direction variable */
00906   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00907   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00908 
00909   /* Swap start and ending tile, also the half-tile drag var (bit 0 and 1) */
00910   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00911     TileIndex t = start_tile;
00912     start_tile = end_tile;
00913     end_tile = t;
00914     p2 ^= IsInsideMM(p2 & 3, 1, 3) ? 3 : 0;
00915   }
00916 
00917   Money money = GetAvailableMoneyForCommand();
00918   TileIndex tile = start_tile;
00919   CommandCost last_error = CMD_ERROR;
00920   bool had_success = false;
00921   /* Start tile is the small number. */
00922   for (;;) {
00923     RoadBits bits = AxisToRoadBits(axis);
00924 
00925     if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
00926     if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
00927 
00928     /* try to remove the halves. */
00929     if (bits != 0) {
00930       CommandCost ret = RemoveRoad(tile, flags & ~DC_EXEC, bits, rt, true);
00931       if (ret.Succeeded()) {
00932         if (flags & DC_EXEC) {
00933           money -= ret.GetCost();
00934           if (money < 0) {
00935             _additional_cash_required = DoCommand(start_tile, end_tile, p2, flags & ~DC_EXEC, CMD_REMOVE_LONG_ROAD).GetCost();
00936             return cost;
00937           }
00938           RemoveRoad(tile, flags, bits, rt, true, false);
00939         }
00940         cost.AddCost(ret);
00941         had_success = true;
00942       } else {
00943         /* Ownership errors are more important. */
00944         if (last_error.GetErrorMessage() != STR_ERROR_OWNED_BY) last_error = ret;
00945       }
00946     }
00947 
00948     if (tile == end_tile) break;
00949 
00950     tile += (axis == AXIS_Y) ? TileDiffXY(0, 1) : TileDiffXY(1, 0);
00951   }
00952 
00953   return had_success ? cost : last_error;
00954 }
00955 
00969 CommandCost CmdBuildRoadDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00970 {
00971   DiagDirection dir = Extract<DiagDirection, 0, 2>(p1);
00972   RoadType rt = Extract<RoadType, 2, 2>(p1);
00973 
00974   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00975 
00976   Slope tileh = GetTileSlope(tile);
00977   if (tileh != SLOPE_FLAT && (
00978         !_settings_game.construction.build_on_slopes ||
00979         !CanBuildDepotByTileh(dir, tileh)
00980       )) {
00981     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00982   }
00983 
00984   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00985   if (cost.Failed()) return cost;
00986 
00987   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
00988 
00989   if (!Depot::CanAllocateItem()) return CMD_ERROR;
00990 
00991   if (flags & DC_EXEC) {
00992     Depot *dep = new Depot(tile);
00993     dep->build_date = _date;
00994 
00995     /* A road depot has two road bits. */
00996     Company::Get(_current_company)->infrastructure.road[rt] += 2;
00997     DirtyCompanyInfrastructureWindows(_current_company);
00998 
00999     MakeRoadDepot(tile, _current_company, dep->index, dir, rt);
01000     MarkTileDirtyByTile(tile);
01001     MakeDefaultName(dep);
01002   }
01003   cost.AddCost(_price[PR_BUILD_DEPOT_ROAD]);
01004   return cost;
01005 }
01006 
01007 static CommandCost RemoveRoadDepot(TileIndex tile, DoCommandFlag flags)
01008 {
01009   if (_current_company != OWNER_WATER) {
01010     CommandCost ret = CheckTileOwnership(tile);
01011     if (ret.Failed()) return ret;
01012   }
01013 
01014   CommandCost ret = EnsureNoVehicleOnGround(tile);
01015   if (ret.Failed()) return ret;
01016 
01017   if (flags & DC_EXEC) {
01018     Company *c = Company::GetIfValid(GetTileOwner(tile));
01019     if (c != NULL) {
01020       /* A road depot has two road bits. */
01021       c->infrastructure.road[FIND_FIRST_BIT(GetRoadTypes(tile))] -= 2;
01022       DirtyCompanyInfrastructureWindows(c->index);
01023     }
01024 
01025     delete Depot::GetByTile(tile);
01026     DoClearSquare(tile);
01027   }
01028 
01029   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_ROAD]);
01030 }
01031 
01032 static CommandCost ClearTile_Road(TileIndex tile, DoCommandFlag flags)
01033 {
01034   switch (GetRoadTileType(tile)) {
01035     case ROAD_TILE_NORMAL: {
01036       RoadBits b = GetAllRoadBits(tile);
01037 
01038       /* Clear the road if only one piece is on the tile OR we are not using the DC_AUTO flag */
01039       if ((HasExactlyOneBit(b) && GetRoadBits(tile, ROADTYPE_TRAM) == ROAD_NONE) || !(flags & DC_AUTO)) {
01040         CommandCost ret(EXPENSES_CONSTRUCTION);
01041         RoadType rt;
01042         FOR_EACH_SET_ROADTYPE(rt, GetRoadTypes(tile)) {
01043           CommandCost tmp_ret = RemoveRoad(tile, flags, GetRoadBits(tile, rt), rt, true);
01044           if (tmp_ret.Failed()) return tmp_ret;
01045           ret.AddCost(tmp_ret);
01046         }
01047         return ret;
01048       }
01049       return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
01050     }
01051 
01052     case ROAD_TILE_CROSSING: {
01053       RoadTypes rts = GetRoadTypes(tile);
01054       CommandCost ret(EXPENSES_CONSTRUCTION);
01055 
01056       if (flags & DC_AUTO) return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
01057 
01058       /* Must iterate over the roadtypes in a reverse manner because
01059        * tram tracks must be removed before the road bits. */
01060       RoadType rt = ROADTYPE_TRAM;
01061       do {
01062         if (HasBit(rts, rt)) {
01063           CommandCost tmp_ret = RemoveRoad(tile, flags, GetCrossingRoadBits(tile), rt, false);
01064           if (tmp_ret.Failed()) return tmp_ret;
01065           ret.AddCost(tmp_ret);
01066         }
01067       } while (rt-- != ROADTYPE_ROAD);
01068 
01069       if (flags & DC_EXEC) {
01070         DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
01071       }
01072       return ret;
01073     }
01074 
01075     default:
01076     case ROAD_TILE_DEPOT:
01077       if (flags & DC_AUTO) {
01078         return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
01079       }
01080       return RemoveRoadDepot(tile, flags);
01081   }
01082 }
01083 
01084 
01085 struct DrawRoadTileStruct {
01086   uint16 image;
01087   byte subcoord_x;
01088   byte subcoord_y;
01089 };
01090 
01091 #include "table/road_land.h"
01092 
01100 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits)
01101 {
01102   /* Flat land and land without a road doesn't require a foundation */
01103   if (tileh == SLOPE_FLAT || bits == ROAD_NONE) return FOUNDATION_NONE;
01104 
01105   /* Steep slopes behave the same as slopes with one corner raised. */
01106   if (IsSteepSlope(tileh)) {
01107     tileh = SlopeWithOneCornerRaised(GetHighestSlopeCorner(tileh));
01108   }
01109 
01110   /* Leveled RoadBits on a slope */
01111   if ((_invalid_tileh_slopes_road[0][tileh] & bits) == ROAD_NONE) return FOUNDATION_LEVELED;
01112 
01113   /* Straight roads without foundation on a slope */
01114   if (!IsSlopeWithOneCornerRaised(tileh) &&
01115       (_invalid_tileh_slopes_road[1][tileh] & bits) == ROAD_NONE)
01116     return FOUNDATION_NONE;
01117 
01118   /* Roads on steep Slopes or on Slopes with one corner raised */
01119   return (bits == ROAD_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
01120 }
01121 
01122 const byte _road_sloped_sprites[14] = {
01123   0,  0,  2,  0,
01124   0,  1,  0,  0,
01125   3,  0,  0,  0,
01126   0,  0
01127 };
01128 
01139 static bool AlwaysDrawUnpavedRoads(TileIndex tile, Roadside roadside)
01140 {
01141   return (IsOnSnow(tile) &&
01142       !(_settings_game.game_creation.landscape == LT_TROPIC && HasGrfMiscBit(GMB_DESERT_PAVED_ROADS) &&
01143         roadside != ROADSIDE_BARREN && roadside != ROADSIDE_GRASS && roadside != ROADSIDE_GRASS_ROAD_WORKS));
01144 }
01145 
01151 void DrawTramCatenary(const TileInfo *ti, RoadBits tram)
01152 {
01153   /* Do not draw catenary if it is invisible */
01154   if (IsInvisibilitySet(TO_CATENARY)) return;
01155 
01156   /* Don't draw the catenary under a low bridge */
01157   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_CATENARY)) {
01158     int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01159 
01160     if (height <= GetTileMaxZ(ti->tile) + 1) return;
01161   }
01162 
01163   SpriteID front;
01164   SpriteID back;
01165 
01166   if (ti->tileh != SLOPE_FLAT) {
01167     back  = SPR_TRAMWAY_BACK_WIRES_SLOPED  + _road_sloped_sprites[ti->tileh - 1];
01168     front = SPR_TRAMWAY_FRONT_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
01169   } else {
01170     back  = SPR_TRAMWAY_BASE + _road_backpole_sprites_1[tram];
01171     front = SPR_TRAMWAY_BASE + _road_frontwire_sprites_1[tram];
01172   }
01173 
01174   AddSortableSpriteToDraw(back,  PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01175   AddSortableSpriteToDraw(front, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01176 }
01177 
01186 static void DrawRoadDetail(SpriteID img, const TileInfo *ti, int dx, int dy, int h)
01187 {
01188   int x = ti->x | dx;
01189   int y = ti->y | dy;
01190   int z = ti->z;
01191   if (ti->tileh != SLOPE_FLAT) z = GetSlopePixelZ(x, y);
01192   AddSortableSpriteToDraw(img, PAL_NONE, x, y, 2, 2, h, z);
01193 }
01194 
01199 static void DrawRoadBits(TileInfo *ti)
01200 {
01201   RoadBits road = GetRoadBits(ti->tile, ROADTYPE_ROAD);
01202   RoadBits tram = GetRoadBits(ti->tile, ROADTYPE_TRAM);
01203 
01204   SpriteID image = 0;
01205   PaletteID pal = PAL_NONE;
01206 
01207   if (ti->tileh != SLOPE_FLAT) {
01208     DrawFoundation(ti, GetRoadFoundation(ti->tileh, road | tram));
01209 
01210     /* DrawFoundation() modifies ti.
01211      * Default sloped sprites.. */
01212     if (ti->tileh != SLOPE_FLAT) image = _road_sloped_sprites[ti->tileh - 1] + SPR_ROAD_SLOPE_START;
01213   }
01214 
01215   if (image == 0) image = _road_tile_sprites_1[road != ROAD_NONE ? road : tram];
01216 
01217   Roadside roadside = GetRoadside(ti->tile);
01218 
01219   if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01220     image += 19;
01221   } else {
01222     switch (roadside) {
01223       case ROADSIDE_BARREN:           pal = PALETTE_TO_BARE_LAND; break;
01224       case ROADSIDE_GRASS:            break;
01225       case ROADSIDE_GRASS_ROAD_WORKS: break;
01226       default:                        image -= 19; break; // Paved
01227     }
01228   }
01229 
01230   DrawGroundSprite(image, pal);
01231 
01232   /* For tram we overlay the road graphics with either tram tracks only
01233    * (when there is actual road beneath the trams) or with tram tracks
01234    * and some dirts which hides the road graphics */
01235   if (tram != ROAD_NONE) {
01236     if (ti->tileh != SLOPE_FLAT) {
01237       image = _road_sloped_sprites[ti->tileh - 1] + SPR_TRAMWAY_SLOPED_OFFSET;
01238     } else {
01239       image = _road_tile_sprites_1[tram] - SPR_ROAD_Y;
01240     }
01241     image += (road == ROAD_NONE) ? SPR_TRAMWAY_TRAM : SPR_TRAMWAY_OVERLAY;
01242     DrawGroundSprite(image, pal);
01243   }
01244 
01245   if (road != ROAD_NONE) {
01246     DisallowedRoadDirections drd = GetDisallowedRoadDirections(ti->tile);
01247     if (drd != DRD_NONE) {
01248       DrawGroundSpriteAt(SPR_ONEWAY_BASE + drd - 1 + ((road == ROAD_X) ? 0 : 3), PAL_NONE, 8, 8, GetPartialPixelZ(8, 8, ti->tileh));
01249     }
01250   }
01251 
01252   if (HasRoadWorks(ti->tile)) {
01253     /* Road works */
01254     DrawGroundSprite((road | tram) & ROAD_X ? SPR_EXCAVATION_X : SPR_EXCAVATION_Y, PAL_NONE);
01255     return;
01256   }
01257 
01258   if (tram != ROAD_NONE) DrawTramCatenary(ti, tram);
01259 
01260   /* Return if full detail is disabled, or we are zoomed fully out. */
01261   if (!HasBit(_display_opt, DO_FULL_DETAIL) || _cur_dpi->zoom > ZOOM_LVL_DETAIL) return;
01262 
01263   /* Do not draw details (street lights, trees) under low bridge */
01264   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && (roadside == ROADSIDE_TREES || roadside == ROADSIDE_STREET_LIGHTS)) {
01265     int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01266     int minz = GetTileMaxZ(ti->tile) + 2;
01267 
01268     if (roadside == ROADSIDE_TREES) minz++;
01269 
01270     if (height < minz) return;
01271   }
01272 
01273   /* If there are no road bits, return, as there is nothing left to do */
01274   if (HasAtMostOneBit(road)) return;
01275 
01276   /* Draw extra details. */
01277   for (const DrawRoadTileStruct *drts = _road_display_table[roadside][road | tram]; drts->image != 0; drts++) {
01278     DrawRoadDetail(drts->image, ti, drts->subcoord_x, drts->subcoord_y, 0x10);
01279   }
01280 }
01281 
01283 static void DrawTile_Road(TileInfo *ti)
01284 {
01285   switch (GetRoadTileType(ti->tile)) {
01286     case ROAD_TILE_NORMAL:
01287       DrawRoadBits(ti);
01288       break;
01289 
01290     case ROAD_TILE_CROSSING: {
01291       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01292 
01293       PaletteID pal = PAL_NONE;
01294       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
01295 
01296       if (rti->UsesOverlay()) {
01297         Axis axis = GetCrossingRailAxis(ti->tile);
01298         SpriteID road = SPR_ROAD_Y + axis;
01299 
01300         Roadside roadside = GetRoadside(ti->tile);
01301 
01302         if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01303           road += 19;
01304         } else {
01305           switch (roadside) {
01306             case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
01307             case ROADSIDE_GRASS:  break;
01308             default:              road -= 19; break; // Paved
01309           }
01310         }
01311 
01312         DrawGroundSprite(road, pal);
01313 
01314         SpriteID rail = GetCustomRailSprite(rti, ti->tile, RTSG_CROSSING) + axis;
01315         /* Draw tracks, but draw PBS reserved tracks darker. */
01316         pal = (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) ? PALETTE_CRASH : PAL_NONE;
01317         DrawGroundSprite(rail, pal);
01318 
01319         DrawRailTileSeq(ti, &_crossing_layout, TO_CATENARY, rail, 0, PAL_NONE);
01320       } else {
01321         SpriteID image = rti->base_sprites.crossing;
01322 
01323         if (GetCrossingRoadAxis(ti->tile) == AXIS_X) image++;
01324         if (IsCrossingBarred(ti->tile)) image += 2;
01325 
01326         Roadside roadside = GetRoadside(ti->tile);
01327 
01328         if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01329           image += 8;
01330         } else {
01331           switch (roadside) {
01332             case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
01333             case ROADSIDE_GRASS:  break;
01334             default:              image += 4; break; // Paved
01335           }
01336         }
01337 
01338         DrawGroundSprite(image, pal);
01339 
01340         /* PBS debugging, draw reserved tracks darker */
01341         if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) {
01342           DrawGroundSprite(GetCrossingRoadAxis(ti->tile) == AXIS_Y ? GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_x : GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_y, PALETTE_CRASH);
01343         }
01344       }
01345 
01346       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01347         DrawGroundSprite(SPR_TRAMWAY_OVERLAY + (GetCrossingRoadAxis(ti->tile) ^ 1), pal);
01348         DrawTramCatenary(ti, GetCrossingRoadBits(ti->tile));
01349       }
01350       if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01351       break;
01352     }
01353 
01354     default:
01355     case ROAD_TILE_DEPOT: {
01356       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01357 
01358       PaletteID palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
01359 
01360       const DrawTileSprites *dts;
01361       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01362         dts =  &_tram_depot[GetRoadDepotDirection(ti->tile)];
01363       } else {
01364         dts =  &_road_depot[GetRoadDepotDirection(ti->tile)];
01365       }
01366 
01367       DrawGroundSprite(dts->ground.sprite, PAL_NONE);
01368       DrawOrigTileSeq(ti, dts, TO_BUILDINGS, palette);
01369       break;
01370     }
01371   }
01372   DrawBridgeMiddle(ti);
01373 }
01374 
01382 void DrawRoadDepotSprite(int x, int y, DiagDirection dir, RoadType rt)
01383 {
01384   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
01385   const DrawTileSprites *dts = (rt == ROADTYPE_TRAM) ? &_tram_depot[dir] : &_road_depot[dir];
01386 
01387   x += 33;
01388   y += 17;
01389 
01390   DrawSprite(dts->ground.sprite, PAL_NONE, x, y);
01391   DrawOrigTileSeqInGUI(x, y, dts, palette);
01392 }
01393 
01399 void UpdateNearestTownForRoadTiles(bool invalidate)
01400 {
01401   assert(!invalidate || _generating_world);
01402 
01403   for (TileIndex t = 0; t < MapSize(); t++) {
01404     if (IsTileType(t, MP_ROAD) && !IsRoadDepot(t) && !HasTownOwnedRoad(t)) {
01405       TownID tid = (TownID)INVALID_TOWN;
01406       if (!invalidate) {
01407         const Town *town = CalcClosestTownFromTile(t);
01408         if (town != NULL) tid = town->index;
01409       }
01410       SetTownIndex(t, tid);
01411     }
01412   }
01413 }
01414 
01415 static int GetSlopePixelZ_Road(TileIndex tile, uint x, uint y)
01416 {
01417 
01418   if (IsNormalRoad(tile)) {
01419     int z;
01420     Slope tileh = GetTilePixelSlope(tile, &z);
01421     if (tileh == SLOPE_FLAT) return z;
01422 
01423     Foundation f = GetRoadFoundation(tileh, GetAllRoadBits(tile));
01424     z += ApplyPixelFoundationToSlope(f, &tileh);
01425     return z + GetPartialPixelZ(x & 0xF, y & 0xF, tileh);
01426   } else {
01427     return GetTileMaxPixelZ(tile);
01428   }
01429 }
01430 
01431 static Foundation GetFoundation_Road(TileIndex tile, Slope tileh)
01432 {
01433   if (IsNormalRoad(tile)) {
01434     return GetRoadFoundation(tileh, GetAllRoadBits(tile));
01435   } else {
01436     return FlatteningFoundation(tileh);
01437   }
01438 }
01439 
01440 static const Roadside _town_road_types[][2] = {
01441   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01442   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01443   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01444   { ROADSIDE_TREES,         ROADSIDE_TREES },
01445   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01446 };
01447 
01448 static const Roadside _town_road_types_2[][2] = {
01449   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01450   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01451   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01452   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01453   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01454 };
01455 
01456 
01457 static void TileLoop_Road(TileIndex tile)
01458 {
01459   switch (_settings_game.game_creation.landscape) {
01460     case LT_ARCTIC:
01461       if (IsOnSnow(tile) != (GetTileZ(tile) > GetSnowLine())) {
01462         ToggleSnow(tile);
01463         MarkTileDirtyByTile(tile);
01464       }
01465       break;
01466 
01467     case LT_TROPIC:
01468       if (GetTropicZone(tile) == TROPICZONE_DESERT && !IsOnDesert(tile)) {
01469         ToggleDesert(tile);
01470         MarkTileDirtyByTile(tile);
01471       }
01472       break;
01473   }
01474 
01475   if (IsRoadDepot(tile)) return;
01476 
01477   const Town *t = ClosestTownFromTile(tile, UINT_MAX);
01478   if (!HasRoadWorks(tile)) {
01479     HouseZonesBits grp = HZB_TOWN_EDGE;
01480 
01481     if (t != NULL) {
01482       grp = GetTownRadiusGroup(t, tile);
01483 
01484       /* Show an animation to indicate road work */
01485       if (t->road_build_months != 0 &&
01486           (DistanceManhattan(t->xy, tile) < 8 || grp != HZB_TOWN_EDGE) &&
01487           IsNormalRoad(tile) && !HasAtMostOneBit(GetAllRoadBits(tile))) {
01488         if (GetFoundationSlope(tile) == SLOPE_FLAT && EnsureNoVehicleOnGround(tile).Succeeded() && Chance16(1, 40)) {
01489           StartRoadWorks(tile);
01490 
01491           SndPlayTileFx(SND_21_JACKHAMMER, tile);
01492           CreateEffectVehicleAbove(
01493             TileX(tile) * TILE_SIZE + 7,
01494             TileY(tile) * TILE_SIZE + 7,
01495             0,
01496             EV_BULLDOZER);
01497           MarkTileDirtyByTile(tile);
01498           return;
01499         }
01500       }
01501     }
01502 
01503     {
01504       /* Adjust road ground type depending on 'grp' (grp is the distance to the center) */
01505       const Roadside *new_rs = (_settings_game.game_creation.landscape == LT_TOYLAND) ? _town_road_types_2[grp] : _town_road_types[grp];
01506       Roadside cur_rs = GetRoadside(tile);
01507 
01508       /* We have our desired type, do nothing */
01509       if (cur_rs == new_rs[0]) return;
01510 
01511       /* We have the pre-type of the desired type, switch to the desired type */
01512       if (cur_rs == new_rs[1]) {
01513         cur_rs = new_rs[0];
01514       /* We have barren land, install the pre-type */
01515       } else if (cur_rs == ROADSIDE_BARREN) {
01516         cur_rs = new_rs[1];
01517       /* We're totally off limits, remove any installation and make barren land */
01518       } else {
01519         cur_rs = ROADSIDE_BARREN;
01520       }
01521       SetRoadside(tile, cur_rs);
01522       MarkTileDirtyByTile(tile);
01523     }
01524   } else if (IncreaseRoadWorksCounter(tile)) {
01525     TerminateRoadWorks(tile);
01526 
01527     if (_settings_game.economy.mod_road_rebuild) {
01528       /* Generate a nicer town surface */
01529       const RoadBits old_rb = GetAnyRoadBits(tile, ROADTYPE_ROAD);
01530       const RoadBits new_rb = CleanUpRoadBits(tile, old_rb);
01531 
01532       if (old_rb != new_rb) {
01533         RemoveRoad(tile, DC_EXEC | DC_AUTO | DC_NO_WATER, (old_rb ^ new_rb), ROADTYPE_ROAD, true);
01534       }
01535     }
01536 
01537     MarkTileDirtyByTile(tile);
01538   }
01539 }
01540 
01541 static bool ClickTile_Road(TileIndex tile)
01542 {
01543   if (!IsRoadDepot(tile)) return false;
01544 
01545   ShowDepotWindow(tile, VEH_ROAD);
01546   return true;
01547 }
01548 
01549 /* Converts RoadBits to TrackBits */
01550 static const TrackBits _road_trackbits[16] = {
01551   TRACK_BIT_NONE,                                  // ROAD_NONE
01552   TRACK_BIT_NONE,                                  // ROAD_NW
01553   TRACK_BIT_NONE,                                  // ROAD_SW
01554   TRACK_BIT_LEFT,                                  // ROAD_W
01555   TRACK_BIT_NONE,                                  // ROAD_SE
01556   TRACK_BIT_Y,                                     // ROAD_Y
01557   TRACK_BIT_LOWER,                                 // ROAD_S
01558   TRACK_BIT_LEFT | TRACK_BIT_LOWER | TRACK_BIT_Y,  // ROAD_Y | ROAD_SW
01559   TRACK_BIT_NONE,                                  // ROAD_NE
01560   TRACK_BIT_UPPER,                                 // ROAD_N
01561   TRACK_BIT_X,                                     // ROAD_X
01562   TRACK_BIT_LEFT | TRACK_BIT_UPPER | TRACK_BIT_X,  // ROAD_X | ROAD_NW
01563   TRACK_BIT_RIGHT,                                 // ROAD_E
01564   TRACK_BIT_RIGHT | TRACK_BIT_UPPER | TRACK_BIT_Y, // ROAD_Y | ROAD_NE
01565   TRACK_BIT_RIGHT | TRACK_BIT_LOWER | TRACK_BIT_X, // ROAD_X | ROAD_SE
01566   TRACK_BIT_ALL,                                   // ROAD_ALL
01567 };
01568 
01569 static TrackStatus GetTileTrackStatus_Road(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
01570 {
01571   TrackdirBits trackdirbits = TRACKDIR_BIT_NONE;
01572   TrackdirBits red_signals = TRACKDIR_BIT_NONE; // crossing barred
01573   switch (mode) {
01574     case TRANSPORT_RAIL:
01575       if (IsLevelCrossing(tile)) trackdirbits = TrackBitsToTrackdirBits(GetCrossingRailBits(tile));
01576       break;
01577 
01578     case TRANSPORT_ROAD:
01579       if ((GetRoadTypes(tile) & sub_mode) == 0) break;
01580       switch (GetRoadTileType(tile)) {
01581         case ROAD_TILE_NORMAL: {
01582           const uint drd_to_multiplier[DRD_END] = { 0x101, 0x100, 0x1, 0x0 };
01583           RoadType rt = (RoadType)FindFirstBit(sub_mode);
01584           RoadBits bits = GetRoadBits(tile, rt);
01585 
01586           /* no roadbit at this side of tile, return 0 */
01587           if (side != INVALID_DIAGDIR && (DiagDirToRoadBits(side) & bits) == 0) break;
01588 
01589           uint multiplier = drd_to_multiplier[rt == ROADTYPE_TRAM ? DRD_NONE : GetDisallowedRoadDirections(tile)];
01590           if (!HasRoadWorks(tile)) trackdirbits = (TrackdirBits)(_road_trackbits[bits] * multiplier);
01591           break;
01592         }
01593 
01594         case ROAD_TILE_CROSSING: {
01595           Axis axis = GetCrossingRoadAxis(tile);
01596 
01597           if (side != INVALID_DIAGDIR && axis != DiagDirToAxis(side)) break;
01598 
01599           trackdirbits = TrackBitsToTrackdirBits(AxisToTrackBits(axis));
01600           if (IsCrossingBarred(tile)) red_signals = trackdirbits;
01601           break;
01602         }
01603 
01604         default:
01605         case ROAD_TILE_DEPOT: {
01606           DiagDirection dir = GetRoadDepotDirection(tile);
01607 
01608           if (side != INVALID_DIAGDIR && side != dir) break;
01609 
01610           trackdirbits = TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir));
01611           break;
01612         }
01613       }
01614       break;
01615 
01616     default: break;
01617   }
01618   return CombineTrackStatus(trackdirbits, red_signals);
01619 }
01620 
01621 static const StringID _road_tile_strings[] = {
01622   STR_LAI_ROAD_DESCRIPTION_ROAD,
01623   STR_LAI_ROAD_DESCRIPTION_ROAD,
01624   STR_LAI_ROAD_DESCRIPTION_ROAD,
01625   STR_LAI_ROAD_DESCRIPTION_ROAD_WITH_STREETLIGHTS,
01626   STR_LAI_ROAD_DESCRIPTION_ROAD,
01627   STR_LAI_ROAD_DESCRIPTION_TREE_LINED_ROAD,
01628   STR_LAI_ROAD_DESCRIPTION_ROAD,
01629   STR_LAI_ROAD_DESCRIPTION_ROAD,
01630 };
01631 
01632 static void GetTileDesc_Road(TileIndex tile, TileDesc *td)
01633 {
01634   Owner rail_owner = INVALID_OWNER;
01635   Owner road_owner = INVALID_OWNER;
01636   Owner tram_owner = INVALID_OWNER;
01637 
01638   switch (GetRoadTileType(tile)) {
01639     case ROAD_TILE_CROSSING: {
01640       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_RAIL_LEVEL_CROSSING;
01641       RoadTypes rts = GetRoadTypes(tile);
01642       rail_owner = GetTileOwner(tile);
01643       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01644       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01645 
01646       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
01647       td->rail_speed = rti->max_speed;
01648 
01649       break;
01650     }
01651 
01652     case ROAD_TILE_DEPOT:
01653       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_VEHICLE_DEPOT;
01654       road_owner = GetTileOwner(tile); // Tile has only one owner, roadtype does not matter
01655       td->build_date = Depot::GetByTile(tile)->build_date;
01656       break;
01657 
01658     default: {
01659       RoadTypes rts = GetRoadTypes(tile);
01660       td->str = (HasBit(rts, ROADTYPE_ROAD) ? _road_tile_strings[GetRoadside(tile)] : STR_LAI_ROAD_DESCRIPTION_TRAMWAY);
01661       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01662       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01663       break;
01664     }
01665   }
01666 
01667   /* Now we have to discover, if the tile has only one owner or many:
01668    *   - Find a first_owner of the tile. (Currently road or tram must be present, but this will break when the third type becomes available)
01669    *   - Compare the found owner with the other owners, and test if they differ.
01670    * Note: If road exists it will be the first_owner.
01671    */
01672   Owner first_owner = (road_owner == INVALID_OWNER ? tram_owner : road_owner);
01673   bool mixed_owners = (tram_owner != INVALID_OWNER && tram_owner != first_owner) || (rail_owner != INVALID_OWNER && rail_owner != first_owner);
01674 
01675   if (mixed_owners) {
01676     /* Multiple owners */
01677     td->owner_type[0] = (rail_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_RAIL_OWNER);
01678     td->owner[0] = rail_owner;
01679     td->owner_type[1] = (road_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_ROAD_OWNER);
01680     td->owner[1] = road_owner;
01681     td->owner_type[2] = (tram_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_TRAM_OWNER);
01682     td->owner[2] = tram_owner;
01683   } else {
01684     /* One to rule them all */
01685     td->owner[0] = first_owner;
01686   }
01687 }
01688 
01693 static const byte _roadveh_enter_depot_dir[4] = {
01694   TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE
01695 };
01696 
01697 static VehicleEnterTileStatus VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
01698 {
01699   switch (GetRoadTileType(tile)) {
01700     case ROAD_TILE_DEPOT: {
01701       if (v->type != VEH_ROAD) break;
01702 
01703       RoadVehicle *rv = RoadVehicle::From(v);
01704       if (rv->frame == RVC_DEPOT_STOP_FRAME &&
01705           _roadveh_enter_depot_dir[GetRoadDepotDirection(tile)] == rv->state) {
01706         rv->state = RVSB_IN_DEPOT;
01707         rv->vehstatus |= VS_HIDDEN;
01708         rv->direction = ReverseDir(rv->direction);
01709         if (rv->Next() == NULL) VehicleEnterDepot(rv->First());
01710         rv->tile = tile;
01711 
01712         InvalidateWindowData(WC_VEHICLE_DEPOT, rv->tile);
01713         return VETSB_ENTERED_WORMHOLE;
01714       }
01715       break;
01716     }
01717 
01718     default: break;
01719   }
01720   return VETSB_CONTINUE;
01721 }
01722 
01723 
01724 static void ChangeTileOwner_Road(TileIndex tile, Owner old_owner, Owner new_owner)
01725 {
01726   if (IsRoadDepot(tile)) {
01727     if (GetTileOwner(tile) == old_owner) {
01728       if (new_owner == INVALID_OWNER) {
01729         DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
01730       } else {
01731         /* A road depot has two road bits. No need to dirty windows here, we'll redraw the whole screen anyway. */
01732         RoadType rt = (RoadType)FIND_FIRST_BIT(GetRoadTypes(tile));
01733         Company::Get(old_owner)->infrastructure.road[rt] -= 2;
01734         Company::Get(new_owner)->infrastructure.road[rt] += 2;
01735 
01736         SetTileOwner(tile, new_owner);
01737       }
01738     }
01739     return;
01740   }
01741 
01742   for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
01743     /* Update all roadtypes, no matter if they are present */
01744     if (GetRoadOwner(tile, rt) == old_owner) {
01745       if (HasTileRoadType(tile, rt)) {
01746         /* A level crossing has two road bits. No need to dirty windows here, we'll redraw the whole screen anyway. */
01747         uint num_bits = IsLevelCrossing(tile) ? 2 : CountBits(GetRoadBits(tile, rt));
01748         Company::Get(old_owner)->infrastructure.road[rt] -= num_bits;
01749         if (new_owner != INVALID_OWNER) Company::Get(new_owner)->infrastructure.road[rt] += num_bits;
01750       }
01751 
01752       SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
01753     }
01754   }
01755 
01756   if (IsLevelCrossing(tile)) {
01757     if (GetTileOwner(tile) == old_owner) {
01758       if (new_owner == INVALID_OWNER) {
01759         DoCommand(tile, 0, GetCrossingRailTrack(tile), DC_EXEC | DC_BANKRUPT, CMD_REMOVE_SINGLE_RAIL);
01760       } else {
01761         /* Update infrastructure counts. No need to dirty windows here, we'll redraw the whole screen anyway. */
01762         Company::Get(old_owner)->infrastructure.rail[GetRailType(tile)] -= LEVELCROSSING_TRACKBIT_FACTOR;
01763         Company::Get(new_owner)->infrastructure.rail[GetRailType(tile)] += LEVELCROSSING_TRACKBIT_FACTOR;
01764 
01765         SetTileOwner(tile, new_owner);
01766       }
01767     }
01768   }
01769 }
01770 
01771 static CommandCost TerraformTile_Road(TileIndex tile, DoCommandFlag flags, int z_new, Slope tileh_new)
01772 {
01773   if (_settings_game.construction.build_on_slopes && AutoslopeEnabled()) {
01774     switch (GetRoadTileType(tile)) {
01775       case ROAD_TILE_CROSSING:
01776         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]);
01777         break;
01778 
01779       case ROAD_TILE_DEPOT:
01780         if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRoadDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01781         break;
01782 
01783       case ROAD_TILE_NORMAL: {
01784         RoadBits bits = GetAllRoadBits(tile);
01785         RoadBits bits_copy = bits;
01786         /* Check if the slope-road_bits combination is valid at all, i.e. it is safe to call GetRoadFoundation(). */
01787         if (CheckRoadSlope(tileh_new, &bits_copy, ROAD_NONE, ROAD_NONE).Succeeded()) {
01788           /* CheckRoadSlope() sometimes changes the road_bits, if it does not agree with them. */
01789           if (bits == bits_copy) {
01790             int z_old;
01791             Slope tileh_old = GetTileSlope(tile, &z_old);
01792 
01793             /* Get the slope on top of the foundation */
01794             z_old += ApplyFoundationToSlope(GetRoadFoundation(tileh_old, bits), &tileh_old);
01795             z_new += ApplyFoundationToSlope(GetRoadFoundation(tileh_new, bits), &tileh_new);
01796 
01797             /* The surface slope must not be changed */
01798             if ((z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01799           }
01800         }
01801         break;
01802       }
01803 
01804       default: NOT_REACHED();
01805     }
01806   }
01807 
01808   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
01809 }
01810 
01812 extern const TileTypeProcs _tile_type_road_procs = {
01813   DrawTile_Road,           // draw_tile_proc
01814   GetSlopePixelZ_Road,     // get_slope_z_proc
01815   ClearTile_Road,          // clear_tile_proc
01816   NULL,                    // add_accepted_cargo_proc
01817   GetTileDesc_Road,        // get_tile_desc_proc
01818   GetTileTrackStatus_Road, // get_tile_track_status_proc
01819   ClickTile_Road,          // click_tile_proc
01820   NULL,                    // animate_tile_proc
01821   TileLoop_Road,           // tile_loop_proc
01822   ChangeTileOwner_Road,    // change_tile_owner_proc
01823   NULL,                    // add_produced_cargo_proc
01824   VehicleEnter_Road,       // vehicle_enter_tile_proc
01825   GetFoundation_Road,      // get_foundation_proc
01826   TerraformTile_Road,      // terraform_tile_proc
01827 };