road_cmd.cpp

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00001 /* $Id$ */
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         }
00388         MarkTileDirtyByTile(tile);
00389         YapfNotifyTrackLayoutChange(tile, railtrack);
00390       }
00391       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_ROAD] * 2);
00392     }
00393 
00394     default:
00395     case ROAD_TILE_DEPOT:
00396       return CMD_ERROR;
00397   }
00398 }
00399 
00400 
00412 static CommandCost CheckRoadSlope(Slope tileh, RoadBits *pieces, RoadBits existing, RoadBits other)
00413 {
00414   /* Remove already build pieces */
00415   CLRBITS(*pieces, existing);
00416 
00417   /* If we can't build anything stop here */
00418   if (*pieces == ROAD_NONE) return CMD_ERROR;
00419 
00420   /* All RoadBit combos are valid on flat land */
00421   if (tileh == SLOPE_FLAT) return CommandCost();
00422 
00423   /* Steep slopes behave the same as slopes with one corner raised. */
00424   if (IsSteepSlope(tileh)) {
00425     tileh = SlopeWithOneCornerRaised(GetHighestSlopeCorner(tileh));
00426   }
00427 
00428   /* Save the merge of all bits of the current type */
00429   RoadBits type_bits = existing | *pieces;
00430 
00431   /* Roads on slopes */
00432   if (_settings_game.construction.build_on_slopes && (_invalid_tileh_slopes_road[0][tileh] & (other | type_bits)) == ROAD_NONE) {
00433 
00434     /* If we add leveling we've got to pay for it */
00435     if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00436 
00437     return CommandCost();
00438   }
00439 
00440   /* Autocomplete uphill roads */
00441   *pieces |= MirrorRoadBits(*pieces);
00442   type_bits = existing | *pieces;
00443 
00444   /* Uphill roads */
00445   if (IsStraightRoad(type_bits) && (other == type_bits || other == ROAD_NONE) &&
00446       (_invalid_tileh_slopes_road[1][tileh] & (other | type_bits)) == ROAD_NONE) {
00447 
00448     /* Slopes with foundation ? */
00449     if (IsSlopeWithOneCornerRaised(tileh)) {
00450 
00451       /* Prevent build on slopes if it isn't allowed */
00452       if (_settings_game.construction.build_on_slopes) {
00453 
00454         /* If we add foundation we've got to pay for it */
00455         if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00456 
00457         return CommandCost();
00458       }
00459     } else {
00460       if (HasExactlyOneBit(existing) && GetRoadFoundation(tileh, existing) == FOUNDATION_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
00461       return CommandCost();
00462     }
00463   }
00464   return CMD_ERROR;
00465 }
00466 
00478 CommandCost CmdBuildRoad(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00479 {
00480   CompanyID company = _current_company;
00481   CommandCost cost(EXPENSES_CONSTRUCTION);
00482 
00483   RoadBits existing = ROAD_NONE;
00484   RoadBits other_bits = ROAD_NONE;
00485 
00486   /* Road pieces are max 4 bitset values (NE, NW, SE, SW) and town can only be non-zero
00487    * if a non-company is building the road */
00488   if ((Company::IsValidID(company) && p2 != 0) || (company == OWNER_TOWN && !Town::IsValidID(p2)) || (company == OWNER_DEITY && p2 != 0)) return CMD_ERROR;
00489   if (company != OWNER_TOWN) {
00490     const Town *town = CalcClosestTownFromTile(tile);
00491     p2 = (town != NULL) ? town->index : (TownID)INVALID_TOWN;
00492 
00493     if (company == OWNER_DEITY) {
00494       company = OWNER_TOWN;
00495 
00496       /* If we are not within a town, we are not owned by the town */
00497       if (town == NULL || DistanceSquare(tile, town->xy) > town->squared_town_zone_radius[HZB_TOWN_EDGE]) {
00498         company = OWNER_NONE;
00499       }
00500     }
00501   }
00502 
00503   RoadBits pieces = Extract<RoadBits, 0, 4>(p1);
00504 
00505   /* do not allow building 'zero' road bits, code wouldn't handle it */
00506   if (pieces == ROAD_NONE) return CMD_ERROR;
00507 
00508   RoadType rt = Extract<RoadType, 4, 2>(p1);
00509   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00510 
00511   DisallowedRoadDirections toggle_drd = Extract<DisallowedRoadDirections, 6, 2>(p1);
00512 
00513   Slope tileh = GetTileSlope(tile);
00514 
00515   bool need_to_clear = false;
00516   switch (GetTileType(tile)) {
00517     case MP_ROAD:
00518       switch (GetRoadTileType(tile)) {
00519         case ROAD_TILE_NORMAL: {
00520           if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00521 
00522           other_bits = GetOtherRoadBits(tile, rt);
00523           if (!HasTileRoadType(tile, rt)) break;
00524 
00525           existing = GetRoadBits(tile, rt);
00526           bool crossing = !IsStraightRoad(existing | pieces);
00527           if (rt != ROADTYPE_TRAM && (GetDisallowedRoadDirections(tile) != DRD_NONE || toggle_drd != DRD_NONE) && crossing) {
00528             /* Junctions cannot be one-way */
00529             return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
00530           }
00531           if ((existing & pieces) == pieces) {
00532             /* We only want to set the (dis)allowed road directions */
00533             if (toggle_drd != DRD_NONE && rt != ROADTYPE_TRAM) {
00534               if (crossing) return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
00535 
00536               Owner owner = GetRoadOwner(tile, ROADTYPE_ROAD);
00537               if (owner != OWNER_NONE) {
00538                 CommandCost ret = CheckOwnership(owner, tile);
00539                 if (ret.Failed()) return ret;
00540               }
00541 
00542               DisallowedRoadDirections dis_existing = GetDisallowedRoadDirections(tile);
00543               DisallowedRoadDirections dis_new      = dis_existing ^ toggle_drd;
00544 
00545               /* We allow removing disallowed directions to break up
00546                * deadlocks, but adding them can break articulated
00547                * vehicles. As such, only when less is disallowed,
00548                * i.e. bits are removed, we skip the vehicle check. */
00549               if (CountBits(dis_existing) <= CountBits(dis_new)) {
00550                 CommandCost ret = EnsureNoVehicleOnGround(tile);
00551                 if (ret.Failed()) return ret;
00552               }
00553 
00554               /* Ignore half built tiles */
00555               if ((flags & DC_EXEC) && rt != ROADTYPE_TRAM && IsStraightRoad(existing)) {
00556                 SetDisallowedRoadDirections(tile, dis_new);
00557                 MarkTileDirtyByTile(tile);
00558               }
00559               return CommandCost();
00560             }
00561             return_cmd_error(STR_ERROR_ALREADY_BUILT);
00562           }
00563           break;
00564         }
00565 
00566         case ROAD_TILE_CROSSING:
00567           other_bits = GetCrossingRoadBits(tile);
00568           if (pieces & ComplementRoadBits(other_bits)) goto do_clear;
00569           pieces = other_bits; // we need to pay for both roadbits
00570 
00571           if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00572           break;
00573 
00574         case ROAD_TILE_DEPOT:
00575           if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00576           goto do_clear;
00577 
00578         default: NOT_REACHED();
00579       }
00580       break;
00581 
00582     case MP_RAILWAY: {
00583       if (IsSteepSlope(tileh)) {
00584         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00585       }
00586 
00587       /* Level crossings may only be built on these slopes */
00588       if (!HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh)) {
00589         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00590       }
00591 
00592       if (GetRailTileType(tile) != RAIL_TILE_NORMAL) goto do_clear;
00593 
00594       if (RailNoLevelCrossings(GetRailType(tile))) {
00595         return_cmd_error(STR_ERROR_CROSSING_DISALLOWED);
00596       }
00597 
00598       Axis roaddir;
00599       switch (GetTrackBits(tile)) {
00600         case TRACK_BIT_X:
00601           if (pieces & ROAD_X) goto do_clear;
00602           roaddir = AXIS_Y;
00603           break;
00604 
00605         case TRACK_BIT_Y:
00606           if (pieces & ROAD_Y) goto do_clear;
00607           roaddir = AXIS_X;
00608           break;
00609 
00610         default: goto do_clear;
00611       }
00612 
00613       CommandCost ret = EnsureNoVehicleOnGround(tile);
00614       if (ret.Failed()) return ret;
00615 
00616       if (flags & DC_EXEC) {
00617         Track railtrack = AxisToTrack(OtherAxis(roaddir));
00618         YapfNotifyTrackLayoutChange(tile, railtrack);
00619         /* Update company infrastructure counts. A level crossing has two road bits. */
00620         Company *c = Company::GetIfValid(company);
00621         if (c != NULL) {
00622           c->infrastructure.road[rt] += 2;
00623           if (rt != ROADTYPE_ROAD) c->infrastructure.road[ROADTYPE_ROAD] += 2;
00624           DirtyCompanyInfrastructureWindows(company);
00625         }
00626         /* Update rail count for level crossings. The plain track is already
00627          * counted, so only add the difference to the level crossing cost. */
00628         c = Company::GetIfValid(GetTileOwner(tile));
00629         if (c != NULL) c->infrastructure.rail[GetRailType(tile)] += LEVELCROSSING_TRACKBIT_FACTOR - 1;
00630 
00631         /* Always add road to the roadtypes (can't draw without it) */
00632         bool reserved = HasBit(GetRailReservationTrackBits(tile), railtrack);
00633         MakeRoadCrossing(tile, company, company, GetTileOwner(tile), roaddir, GetRailType(tile), RoadTypeToRoadTypes(rt) | ROADTYPES_ROAD, p2);
00634         SetCrossingReservation(tile, reserved);
00635         UpdateLevelCrossing(tile, false);
00636         MarkTileDirtyByTile(tile);
00637       }
00638       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_ROAD] * (rt == ROADTYPE_ROAD ? 2 : 4));
00639     }
00640 
00641     case MP_STATION: {
00642       if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00643       if (!IsDriveThroughStopTile(tile)) goto do_clear;
00644 
00645       RoadBits curbits = AxisToRoadBits(DiagDirToAxis(GetRoadStopDir(tile)));
00646       if (pieces & ~curbits) goto do_clear;
00647       pieces = curbits; // we need to pay for both roadbits
00648 
00649       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00650       break;
00651     }
00652 
00653     case MP_TUNNELBRIDGE: {
00654       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) goto do_clear;
00655       if (MirrorRoadBits(DiagDirToRoadBits(GetTunnelBridgeDirection(tile))) != pieces) goto do_clear;
00656       if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
00657       /* Don't allow adding roadtype to the bridge/tunnel when vehicles are already driving on it */
00658       CommandCost ret = TunnelBridgeIsFree(tile, GetOtherTunnelBridgeEnd(tile));
00659       if (ret.Failed()) return ret;
00660       break;
00661     }
00662 
00663     default: {
00664 do_clear:;
00665       need_to_clear = true;
00666       break;
00667     }
00668   }
00669 
00670   if (need_to_clear) {
00671     CommandCost ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00672     if (ret.Failed()) return ret;
00673     cost.AddCost(ret);
00674   }
00675 
00676   if (other_bits != pieces) {
00677     /* Check the foundation/slopes when adding road/tram bits */
00678     CommandCost ret = CheckRoadSlope(tileh, &pieces, existing, other_bits);
00679     /* Return an error if we need to build a foundation (ret != 0) but the
00680      * current setting is turned off */
00681     if (ret.Failed() || (ret.GetCost() != 0 && !_settings_game.construction.build_on_slopes)) {
00682       return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00683     }
00684     cost.AddCost(ret);
00685   }
00686 
00687   if (!need_to_clear) {
00688     if (IsTileType(tile, MP_ROAD)) {
00689       /* Don't put the pieces that already exist */
00690       pieces &= ComplementRoadBits(existing);
00691 
00692       /* Check if new road bits will have the same foundation as other existing road types */
00693       if (IsNormalRoad(tile)) {
00694         Slope slope = GetTileSlope(tile);
00695         Foundation found_new = GetRoadFoundation(slope, pieces | existing);
00696 
00697         /* Test if all other roadtypes can be built at that foundation */
00698         for (RoadType rtest = ROADTYPE_ROAD; rtest < ROADTYPE_END; rtest++) {
00699           if (rtest != rt) { // check only other road types
00700             RoadBits bits = GetRoadBits(tile, rtest);
00701             /* do not check if there are not road bits of given type */
00702             if (bits != ROAD_NONE && GetRoadFoundation(slope, bits) != found_new) {
00703               return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00704             }
00705           }
00706         }
00707       }
00708     }
00709 
00710     CommandCost ret = EnsureNoVehicleOnGround(tile);
00711     if (ret.Failed()) return ret;
00712 
00713   }
00714 
00715   uint num_pieces = (!need_to_clear && IsTileType(tile, MP_TUNNELBRIDGE)) ?
00716       /* There are 2 pieces on *every* tile of the bridge or tunnel */
00717       2 * (GetTunnelBridgeLength(GetOtherTunnelBridgeEnd(tile), tile) + 2) :
00718       /* Count pieces */
00719       CountBits(pieces);
00720 
00721   cost.AddCost(num_pieces * _price[PR_BUILD_ROAD]);
00722 
00723   if (flags & DC_EXEC) {
00724     switch (GetTileType(tile)) {
00725       case MP_ROAD: {
00726         RoadTileType rtt = GetRoadTileType(tile);
00727         if (existing == ROAD_NONE || rtt == ROAD_TILE_CROSSING) {
00728           SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00729           SetRoadOwner(tile, rt, company);
00730           if (rt == ROADTYPE_ROAD) SetTownIndex(tile, p2);
00731         }
00732         if (rtt != ROAD_TILE_CROSSING) SetRoadBits(tile, existing | pieces, rt);
00733         break;
00734       }
00735 
00736       case MP_TUNNELBRIDGE: {
00737         TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
00738 
00739         SetRoadTypes(other_end, GetRoadTypes(other_end) | RoadTypeToRoadTypes(rt));
00740         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00741         SetRoadOwner(other_end, rt, company);
00742         SetRoadOwner(tile, rt, company);
00743 
00744         /* Mark tiles dirty that have been repaved */
00745         MarkTileDirtyByTile(other_end);
00746         MarkTileDirtyByTile(tile);
00747         if (IsBridge(tile)) {
00748           TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
00749 
00750           for (TileIndex t = tile + delta; t != other_end; t += delta) MarkTileDirtyByTile(t);
00751         }
00752         break;
00753       }
00754 
00755       case MP_STATION:
00756         assert(IsDriveThroughStopTile(tile));
00757         SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
00758         SetRoadOwner(tile, rt, company);
00759         break;
00760 
00761       default:
00762         MakeRoadNormal(tile, pieces, RoadTypeToRoadTypes(rt), p2, company, company);
00763         break;
00764     }
00765 
00766     /* Update company infrastructure count. */
00767     Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
00768     if (c != NULL) {
00769       if (IsTileType(tile, MP_TUNNELBRIDGE)) num_pieces *= TUNNELBRIDGE_TRACKBIT_FACTOR;
00770       c->infrastructure.road[rt] += num_pieces;
00771       DirtyCompanyInfrastructureWindows(c->index);
00772     }
00773 
00774     if (rt != ROADTYPE_TRAM && IsNormalRoadTile(tile)) {
00775       existing |= pieces;
00776       SetDisallowedRoadDirections(tile, IsStraightRoad(existing) ?
00777           GetDisallowedRoadDirections(tile) ^ toggle_drd : DRD_NONE);
00778     }
00779 
00780     MarkTileDirtyByTile(tile);
00781   }
00782   return cost;
00783 }
00784 
00800 CommandCost CmdBuildLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00801 {
00802   DisallowedRoadDirections drd = DRD_NORTHBOUND;
00803 
00804   if (p1 >= MapSize()) return CMD_ERROR;
00805 
00806   TileIndex end_tile = p1;
00807   RoadType rt = Extract<RoadType, 3, 2>(p2);
00808   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00809 
00810   Axis axis = Extract<Axis, 2, 1>(p2);
00811   /* Only drag in X or Y direction dictated by the direction variable */
00812   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00813   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00814 
00815   DiagDirection dir = AxisToDiagDir(axis);
00816 
00817   /* Swap direction, also the half-tile drag var (bit 0 and 1) */
00818   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00819     dir = ReverseDiagDir(dir);
00820     p2 ^= 3;
00821     drd = DRD_SOUTHBOUND;
00822   }
00823 
00824   /* On the X-axis, we have to swap the initial bits, so they
00825    * will be interpreted correctly in the GTTS. Furthermore
00826    * when you just 'click' on one tile to build them. */
00827   if ((axis == AXIS_Y) == (start_tile == end_tile && HasBit(p2, 0) == HasBit(p2, 1))) drd ^= DRD_BOTH;
00828   /* No disallowed direction bits have to be toggled */
00829   if (!HasBit(p2, 5)) drd = DRD_NONE;
00830 
00831   CommandCost cost(EXPENSES_CONSTRUCTION);
00832   CommandCost last_error = CMD_ERROR;
00833   TileIndex tile = start_tile;
00834   bool had_bridge = false;
00835   bool had_tunnel = false;
00836   bool had_success = false;
00837   /* Start tile is the first tile clicked by the user. */
00838   for (;;) {
00839     RoadBits bits = AxisToRoadBits(axis);
00840 
00841     /* Road parts only have to be built at the start tile or at the end tile. */
00842     if (tile == end_tile && !HasBit(p2, 1)) bits &= DiagDirToRoadBits(ReverseDiagDir(dir));
00843     if (tile == start_tile && HasBit(p2, 0)) bits &= DiagDirToRoadBits(dir);
00844 
00845     CommandCost ret = DoCommand(tile, drd << 6 | rt << 4 | bits, 0, flags, CMD_BUILD_ROAD);
00846     if (ret.Failed()) {
00847       last_error = ret;
00848       if (last_error.GetErrorMessage() != STR_ERROR_ALREADY_BUILT) {
00849         if (HasBit(p2, 6)) return last_error;
00850         break;
00851       }
00852     } else {
00853       had_success = true;
00854       /* Only pay for the upgrade on one side of the bridges and tunnels */
00855       if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00856         if (IsBridge(tile)) {
00857           if (!had_bridge || GetTunnelBridgeDirection(tile) == dir) {
00858             cost.AddCost(ret);
00859           }
00860           had_bridge = true;
00861         } else { // IsTunnel(tile)
00862           if (!had_tunnel || GetTunnelBridgeDirection(tile) == dir) {
00863             cost.AddCost(ret);
00864           }
00865           had_tunnel = true;
00866         }
00867       } else {
00868         cost.AddCost(ret);
00869       }
00870     }
00871 
00872     if (tile == end_tile) break;
00873 
00874     tile += TileOffsByDiagDir(dir);
00875   }
00876 
00877   return had_success ? cost : last_error;
00878 }
00879 
00893 CommandCost CmdRemoveLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00894 {
00895   CommandCost cost(EXPENSES_CONSTRUCTION);
00896 
00897   if (p1 >= MapSize()) return CMD_ERROR;
00898 
00899   TileIndex end_tile = p1;
00900   RoadType rt = Extract<RoadType, 3, 2>(p2);
00901   if (!IsValidRoadType(rt)) return CMD_ERROR;
00902 
00903   Axis axis = Extract<Axis, 2, 1>(p2);
00904   /* Only drag in X or Y direction dictated by the direction variable */
00905   if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
00906   if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
00907 
00908   /* Swap start and ending tile, also the half-tile drag var (bit 0 and 1) */
00909   if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
00910     TileIndex t = start_tile;
00911     start_tile = end_tile;
00912     end_tile = t;
00913     p2 ^= IsInsideMM(p2 & 3, 1, 3) ? 3 : 0;
00914   }
00915 
00916   Money money = GetAvailableMoneyForCommand();
00917   TileIndex tile = start_tile;
00918   CommandCost last_error = CMD_ERROR;
00919   bool had_success = false;
00920   /* Start tile is the small number. */
00921   for (;;) {
00922     RoadBits bits = AxisToRoadBits(axis);
00923 
00924     if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
00925     if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
00926 
00927     /* try to remove the halves. */
00928     if (bits != 0) {
00929       CommandCost ret = RemoveRoad(tile, flags & ~DC_EXEC, bits, rt, true);
00930       if (ret.Succeeded()) {
00931         if (flags & DC_EXEC) {
00932           money -= ret.GetCost();
00933           if (money < 0) {
00934             _additional_cash_required = DoCommand(start_tile, end_tile, p2, flags & ~DC_EXEC, CMD_REMOVE_LONG_ROAD).GetCost();
00935             return cost;
00936           }
00937           RemoveRoad(tile, flags, bits, rt, true, false);
00938         }
00939         cost.AddCost(ret);
00940         had_success = true;
00941       } else {
00942         /* Ownership errors are more important. */
00943         if (last_error.GetErrorMessage() != STR_ERROR_OWNED_BY) last_error = ret;
00944       }
00945     }
00946 
00947     if (tile == end_tile) break;
00948 
00949     tile += (axis == AXIS_Y) ? TileDiffXY(0, 1) : TileDiffXY(1, 0);
00950   }
00951 
00952   return had_success ? cost : last_error;
00953 }
00954 
00968 CommandCost CmdBuildRoadDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00969 {
00970   DiagDirection dir = Extract<DiagDirection, 0, 2>(p1);
00971   RoadType rt = Extract<RoadType, 2, 2>(p1);
00972 
00973   if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
00974 
00975   Slope tileh = GetTileSlope(tile);
00976   if (tileh != SLOPE_FLAT && (
00977         !_settings_game.construction.build_on_slopes ||
00978         !CanBuildDepotByTileh(dir, tileh)
00979       )) {
00980     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00981   }
00982 
00983   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00984   if (cost.Failed()) return cost;
00985 
00986   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
00987 
00988   if (!Depot::CanAllocateItem()) return CMD_ERROR;
00989 
00990   if (flags & DC_EXEC) {
00991     Depot *dep = new Depot(tile);
00992     dep->build_date = _date;
00993 
00994     /* A road depot has two road bits. */
00995     Company::Get(_current_company)->infrastructure.road[rt] += 2;
00996     DirtyCompanyInfrastructureWindows(_current_company);
00997 
00998     MakeRoadDepot(tile, _current_company, dep->index, dir, rt);
00999     MarkTileDirtyByTile(tile);
01000     MakeDefaultName(dep);
01001   }
01002   cost.AddCost(_price[PR_BUILD_DEPOT_ROAD]);
01003   return cost;
01004 }
01005 
01006 static CommandCost RemoveRoadDepot(TileIndex tile, DoCommandFlag flags)
01007 {
01008   if (_current_company != OWNER_WATER) {
01009     CommandCost ret = CheckTileOwnership(tile);
01010     if (ret.Failed()) return ret;
01011   }
01012 
01013   CommandCost ret = EnsureNoVehicleOnGround(tile);
01014   if (ret.Failed()) return ret;
01015 
01016   if (flags & DC_EXEC) {
01017     Company *c = Company::GetIfValid(GetTileOwner(tile));
01018     if (c != NULL) {
01019       /* A road depot has two road bits. */
01020       c->infrastructure.road[FIND_FIRST_BIT(GetRoadTypes(tile))] -= 2;
01021       DirtyCompanyInfrastructureWindows(c->index);
01022     }
01023 
01024     delete Depot::GetByTile(tile);
01025     DoClearSquare(tile);
01026   }
01027 
01028   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_ROAD]);
01029 }
01030 
01031 static CommandCost ClearTile_Road(TileIndex tile, DoCommandFlag flags)
01032 {
01033   switch (GetRoadTileType(tile)) {
01034     case ROAD_TILE_NORMAL: {
01035       RoadBits b = GetAllRoadBits(tile);
01036 
01037       /* Clear the road if only one piece is on the tile OR we are not using the DC_AUTO flag */
01038       if ((HasExactlyOneBit(b) && GetRoadBits(tile, ROADTYPE_TRAM) == ROAD_NONE) || !(flags & DC_AUTO)) {
01039         CommandCost ret(EXPENSES_CONSTRUCTION);
01040         RoadType rt;
01041         FOR_EACH_SET_ROADTYPE(rt, GetRoadTypes(tile)) {
01042           CommandCost tmp_ret = RemoveRoad(tile, flags, GetRoadBits(tile, rt), rt, true);
01043           if (tmp_ret.Failed()) return tmp_ret;
01044           ret.AddCost(tmp_ret);
01045         }
01046         return ret;
01047       }
01048       return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
01049     }
01050 
01051     case ROAD_TILE_CROSSING: {
01052       RoadTypes rts = GetRoadTypes(tile);
01053       CommandCost ret(EXPENSES_CONSTRUCTION);
01054 
01055       if (flags & DC_AUTO) return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
01056 
01057       /* Must iterate over the roadtypes in a reverse manner because
01058        * tram tracks must be removed before the road bits. */
01059       RoadType rt = ROADTYPE_TRAM;
01060       do {
01061         if (HasBit(rts, rt)) {
01062           CommandCost tmp_ret = RemoveRoad(tile, flags, GetCrossingRoadBits(tile), rt, false);
01063           if (tmp_ret.Failed()) return tmp_ret;
01064           ret.AddCost(tmp_ret);
01065         }
01066       } while (rt-- != ROADTYPE_ROAD);
01067 
01068       if (flags & DC_EXEC) {
01069         DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
01070       }
01071       return ret;
01072     }
01073 
01074     default:
01075     case ROAD_TILE_DEPOT:
01076       if (flags & DC_AUTO) {
01077         return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
01078       }
01079       return RemoveRoadDepot(tile, flags);
01080   }
01081 }
01082 
01083 
01084 struct DrawRoadTileStruct {
01085   uint16 image;
01086   byte subcoord_x;
01087   byte subcoord_y;
01088 };
01089 
01090 #include "table/road_land.h"
01091 
01099 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits)
01100 {
01101   /* Flat land and land without a road doesn't require a foundation */
01102   if (tileh == SLOPE_FLAT || bits == ROAD_NONE) return FOUNDATION_NONE;
01103 
01104   /* Steep slopes behave the same as slopes with one corner raised. */
01105   if (IsSteepSlope(tileh)) {
01106     tileh = SlopeWithOneCornerRaised(GetHighestSlopeCorner(tileh));
01107   }
01108 
01109   /* Leveled RoadBits on a slope */
01110   if ((_invalid_tileh_slopes_road[0][tileh] & bits) == ROAD_NONE) return FOUNDATION_LEVELED;
01111 
01112   /* Straight roads without foundation on a slope */
01113   if (!IsSlopeWithOneCornerRaised(tileh) &&
01114       (_invalid_tileh_slopes_road[1][tileh] & bits) == ROAD_NONE)
01115     return FOUNDATION_NONE;
01116 
01117   /* Roads on steep Slopes or on Slopes with one corner raised */
01118   return (bits == ROAD_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
01119 }
01120 
01121 const byte _road_sloped_sprites[14] = {
01122   0,  0,  2,  0,
01123   0,  1,  0,  0,
01124   3,  0,  0,  0,
01125   0,  0
01126 };
01127 
01138 static bool AlwaysDrawUnpavedRoads(TileIndex tile, Roadside roadside)
01139 {
01140   return (IsOnSnow(tile) &&
01141       !(_settings_game.game_creation.landscape == LT_TROPIC && HasGrfMiscBit(GMB_DESERT_PAVED_ROADS) &&
01142         roadside != ROADSIDE_BARREN && roadside != ROADSIDE_GRASS && roadside != ROADSIDE_GRASS_ROAD_WORKS));
01143 }
01144 
01150 void DrawTramCatenary(const TileInfo *ti, RoadBits tram)
01151 {
01152   /* Do not draw catenary if it is invisible */
01153   if (IsInvisibilitySet(TO_CATENARY)) return;
01154 
01155   /* Don't draw the catenary under a low bridge */
01156   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_CATENARY)) {
01157     int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01158 
01159     if (height <= GetTileMaxZ(ti->tile) + 1) return;
01160   }
01161 
01162   SpriteID front;
01163   SpriteID back;
01164 
01165   if (ti->tileh != SLOPE_FLAT) {
01166     back  = SPR_TRAMWAY_BACK_WIRES_SLOPED  + _road_sloped_sprites[ti->tileh - 1];
01167     front = SPR_TRAMWAY_FRONT_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
01168   } else {
01169     back  = SPR_TRAMWAY_BASE + _road_backpole_sprites_1[tram];
01170     front = SPR_TRAMWAY_BASE + _road_frontwire_sprites_1[tram];
01171   }
01172 
01173   AddSortableSpriteToDraw(back,  PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01174   AddSortableSpriteToDraw(front, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
01175 }
01176 
01185 static void DrawRoadDetail(SpriteID img, const TileInfo *ti, int dx, int dy, int h)
01186 {
01187   int x = ti->x | dx;
01188   int y = ti->y | dy;
01189   int z = ti->z;
01190   if (ti->tileh != SLOPE_FLAT) z = GetSlopePixelZ(x, y);
01191   AddSortableSpriteToDraw(img, PAL_NONE, x, y, 2, 2, h, z);
01192 }
01193 
01198 static void DrawRoadBits(TileInfo *ti)
01199 {
01200   RoadBits road = GetRoadBits(ti->tile, ROADTYPE_ROAD);
01201   RoadBits tram = GetRoadBits(ti->tile, ROADTYPE_TRAM);
01202 
01203   SpriteID image = 0;
01204   PaletteID pal = PAL_NONE;
01205 
01206   if (ti->tileh != SLOPE_FLAT) {
01207     DrawFoundation(ti, GetRoadFoundation(ti->tileh, road | tram));
01208 
01209     /* DrawFoundation() modifies ti.
01210      * Default sloped sprites.. */
01211     if (ti->tileh != SLOPE_FLAT) image = _road_sloped_sprites[ti->tileh - 1] + SPR_ROAD_SLOPE_START;
01212   }
01213 
01214   if (image == 0) image = _road_tile_sprites_1[road != ROAD_NONE ? road : tram];
01215 
01216   Roadside roadside = GetRoadside(ti->tile);
01217 
01218   if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01219     image += 19;
01220   } else {
01221     switch (roadside) {
01222       case ROADSIDE_BARREN:           pal = PALETTE_TO_BARE_LAND; break;
01223       case ROADSIDE_GRASS:            break;
01224       case ROADSIDE_GRASS_ROAD_WORKS: break;
01225       default:                        image -= 19; break; // Paved
01226     }
01227   }
01228 
01229   DrawGroundSprite(image, pal);
01230 
01231   /* For tram we overlay the road graphics with either tram tracks only
01232    * (when there is actual road beneath the trams) or with tram tracks
01233    * and some dirts which hides the road graphics */
01234   if (tram != ROAD_NONE) {
01235     if (ti->tileh != SLOPE_FLAT) {
01236       image = _road_sloped_sprites[ti->tileh - 1] + SPR_TRAMWAY_SLOPED_OFFSET;
01237     } else {
01238       image = _road_tile_sprites_1[tram] - SPR_ROAD_Y;
01239     }
01240     image += (road == ROAD_NONE) ? SPR_TRAMWAY_TRAM : SPR_TRAMWAY_OVERLAY;
01241     DrawGroundSprite(image, pal);
01242   }
01243 
01244   if (road != ROAD_NONE) {
01245     DisallowedRoadDirections drd = GetDisallowedRoadDirections(ti->tile);
01246     if (drd != DRD_NONE) {
01247       DrawGroundSpriteAt(SPR_ONEWAY_BASE + drd - 1 + ((road == ROAD_X) ? 0 : 3), PAL_NONE, 8, 8, GetPartialPixelZ(8, 8, ti->tileh));
01248     }
01249   }
01250 
01251   if (HasRoadWorks(ti->tile)) {
01252     /* Road works */
01253     DrawGroundSprite((road | tram) & ROAD_X ? SPR_EXCAVATION_X : SPR_EXCAVATION_Y, PAL_NONE);
01254     return;
01255   }
01256 
01257   if (tram != ROAD_NONE) DrawTramCatenary(ti, tram);
01258 
01259   /* Return if full detail is disabled, or we are zoomed fully out. */
01260   if (!HasBit(_display_opt, DO_FULL_DETAIL) || _cur_dpi->zoom > ZOOM_LVL_DETAIL) return;
01261 
01262   /* Do not draw details (street lights, trees) under low bridge */
01263   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && (roadside == ROADSIDE_TREES || roadside == ROADSIDE_STREET_LIGHTS)) {
01264     int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
01265     int minz = GetTileMaxZ(ti->tile) + 2;
01266 
01267     if (roadside == ROADSIDE_TREES) minz++;
01268 
01269     if (height < minz) return;
01270   }
01271 
01272   /* If there are no road bits, return, as there is nothing left to do */
01273   if (HasAtMostOneBit(road)) return;
01274 
01275   /* Draw extra details. */
01276   for (const DrawRoadTileStruct *drts = _road_display_table[roadside][road | tram]; drts->image != 0; drts++) {
01277     DrawRoadDetail(drts->image, ti, drts->subcoord_x, drts->subcoord_y, 0x10);
01278   }
01279 }
01280 
01282 static void DrawTile_Road(TileInfo *ti)
01283 {
01284   switch (GetRoadTileType(ti->tile)) {
01285     case ROAD_TILE_NORMAL:
01286       DrawRoadBits(ti);
01287       break;
01288 
01289     case ROAD_TILE_CROSSING: {
01290       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01291 
01292       PaletteID pal = PAL_NONE;
01293       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
01294 
01295       if (rti->UsesOverlay()) {
01296         Axis axis = GetCrossingRailAxis(ti->tile);
01297         SpriteID road = SPR_ROAD_Y + axis;
01298 
01299         Roadside roadside = GetRoadside(ti->tile);
01300 
01301         if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01302           road += 19;
01303         } else {
01304           switch (roadside) {
01305             case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
01306             case ROADSIDE_GRASS:  break;
01307             default:              road -= 19; break; // Paved
01308           }
01309         }
01310 
01311         DrawGroundSprite(road, pal);
01312 
01313         SpriteID rail = GetCustomRailSprite(rti, ti->tile, RTSG_CROSSING) + axis;
01314         /* Draw tracks, but draw PBS reserved tracks darker. */
01315         pal = (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) ? PALETTE_CRASH : PAL_NONE;
01316         DrawGroundSprite(rail, pal);
01317 
01318         DrawRailTileSeq(ti, &_crossing_layout, TO_CATENARY, rail, 0, PAL_NONE);
01319       } else {
01320         SpriteID image = rti->base_sprites.crossing;
01321 
01322         if (GetCrossingRoadAxis(ti->tile) == AXIS_X) image++;
01323         if (IsCrossingBarred(ti->tile)) image += 2;
01324 
01325         Roadside roadside = GetRoadside(ti->tile);
01326 
01327         if (AlwaysDrawUnpavedRoads(ti->tile, roadside)) {
01328           image += 8;
01329         } else {
01330           switch (roadside) {
01331             case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
01332             case ROADSIDE_GRASS:  break;
01333             default:              image += 4; break; // Paved
01334           }
01335         }
01336 
01337         DrawGroundSprite(image, pal);
01338 
01339         /* PBS debugging, draw reserved tracks darker */
01340         if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) {
01341           DrawGroundSprite(GetCrossingRoadAxis(ti->tile) == AXIS_Y ? GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_x : GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.single_y, PALETTE_CRASH);
01342         }
01343       }
01344 
01345       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01346         DrawGroundSprite(SPR_TRAMWAY_OVERLAY + (GetCrossingRoadAxis(ti->tile) ^ 1), pal);
01347         DrawTramCatenary(ti, GetCrossingRoadBits(ti->tile));
01348       }
01349       if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01350       break;
01351     }
01352 
01353     default:
01354     case ROAD_TILE_DEPOT: {
01355       if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01356 
01357       PaletteID palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
01358 
01359       const DrawTileSprites *dts;
01360       if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
01361         dts =  &_tram_depot[GetRoadDepotDirection(ti->tile)];
01362       } else {
01363         dts =  &_road_depot[GetRoadDepotDirection(ti->tile)];
01364       }
01365 
01366       DrawGroundSprite(dts->ground.sprite, PAL_NONE);
01367       DrawOrigTileSeq(ti, dts, TO_BUILDINGS, palette);
01368       break;
01369     }
01370   }
01371   DrawBridgeMiddle(ti);
01372 }
01373 
01381 void DrawRoadDepotSprite(int x, int y, DiagDirection dir, RoadType rt)
01382 {
01383   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
01384   const DrawTileSprites *dts = (rt == ROADTYPE_TRAM) ? &_tram_depot[dir] : &_road_depot[dir];
01385 
01386   x += 33;
01387   y += 17;
01388 
01389   DrawSprite(dts->ground.sprite, PAL_NONE, x, y);
01390   DrawOrigTileSeqInGUI(x, y, dts, palette);
01391 }
01392 
01398 void UpdateNearestTownForRoadTiles(bool invalidate)
01399 {
01400   assert(!invalidate || _generating_world);
01401 
01402   for (TileIndex t = 0; t < MapSize(); t++) {
01403     if (IsTileType(t, MP_ROAD) && !IsRoadDepot(t) && !HasTownOwnedRoad(t)) {
01404       TownID tid = (TownID)INVALID_TOWN;
01405       if (!invalidate) {
01406         const Town *town = CalcClosestTownFromTile(t);
01407         if (town != NULL) tid = town->index;
01408       }
01409       SetTownIndex(t, tid);
01410     }
01411   }
01412 }
01413 
01414 static int GetSlopePixelZ_Road(TileIndex tile, uint x, uint y)
01415 {
01416 
01417   if (IsNormalRoad(tile)) {
01418     int z;
01419     Slope tileh = GetTilePixelSlope(tile, &z);
01420     if (tileh == SLOPE_FLAT) return z;
01421 
01422     Foundation f = GetRoadFoundation(tileh, GetAllRoadBits(tile));
01423     z += ApplyPixelFoundationToSlope(f, &tileh);
01424     return z + GetPartialPixelZ(x & 0xF, y & 0xF, tileh);
01425   } else {
01426     return GetTileMaxPixelZ(tile);
01427   }
01428 }
01429 
01430 static Foundation GetFoundation_Road(TileIndex tile, Slope tileh)
01431 {
01432   if (IsNormalRoad(tile)) {
01433     return GetRoadFoundation(tileh, GetAllRoadBits(tile));
01434   } else {
01435     return FlatteningFoundation(tileh);
01436   }
01437 }
01438 
01439 static const Roadside _town_road_types[][2] = {
01440   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01441   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01442   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01443   { ROADSIDE_TREES,         ROADSIDE_TREES },
01444   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01445 };
01446 
01447 static const Roadside _town_road_types_2[][2] = {
01448   { ROADSIDE_GRASS,         ROADSIDE_GRASS },
01449   { ROADSIDE_PAVED,         ROADSIDE_PAVED },
01450   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01451   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED },
01452   { ROADSIDE_STREET_LIGHTS, ROADSIDE_PAVED }
01453 };
01454 
01455 
01456 static void TileLoop_Road(TileIndex tile)
01457 {
01458   switch (_settings_game.game_creation.landscape) {
01459     case LT_ARCTIC:
01460       if (IsOnSnow(tile) != (GetTileZ(tile) > GetSnowLine())) {
01461         ToggleSnow(tile);
01462         MarkTileDirtyByTile(tile);
01463       }
01464       break;
01465 
01466     case LT_TROPIC:
01467       if (GetTropicZone(tile) == TROPICZONE_DESERT && !IsOnDesert(tile)) {
01468         ToggleDesert(tile);
01469         MarkTileDirtyByTile(tile);
01470       }
01471       break;
01472   }
01473 
01474   if (IsRoadDepot(tile)) return;
01475 
01476   const Town *t = ClosestTownFromTile(tile, UINT_MAX);
01477   if (!HasRoadWorks(tile)) {
01478     HouseZonesBits grp = HZB_TOWN_EDGE;
01479 
01480     if (t != NULL) {
01481       grp = GetTownRadiusGroup(t, tile);
01482 
01483       /* Show an animation to indicate road work */
01484       if (t->road_build_months != 0 &&
01485           (DistanceManhattan(t->xy, tile) < 8 || grp != HZB_TOWN_EDGE) &&
01486           IsNormalRoad(tile) && !HasAtMostOneBit(GetAllRoadBits(tile))) {
01487         if (GetFoundationSlope(tile) == SLOPE_FLAT && EnsureNoVehicleOnGround(tile).Succeeded() && Chance16(1, 40)) {
01488           StartRoadWorks(tile);
01489 
01490           SndPlayTileFx(SND_21_JACKHAMMER, tile);
01491           CreateEffectVehicleAbove(
01492             TileX(tile) * TILE_SIZE + 7,
01493             TileY(tile) * TILE_SIZE + 7,
01494             0,
01495             EV_BULLDOZER);
01496           MarkTileDirtyByTile(tile);
01497           return;
01498         }
01499       }
01500     }
01501 
01502     {
01503       /* Adjust road ground type depending on 'grp' (grp is the distance to the center) */
01504       const Roadside *new_rs = (_settings_game.game_creation.landscape == LT_TOYLAND) ? _town_road_types_2[grp] : _town_road_types[grp];
01505       Roadside cur_rs = GetRoadside(tile);
01506 
01507       /* We have our desired type, do nothing */
01508       if (cur_rs == new_rs[0]) return;
01509 
01510       /* We have the pre-type of the desired type, switch to the desired type */
01511       if (cur_rs == new_rs[1]) {
01512         cur_rs = new_rs[0];
01513       /* We have barren land, install the pre-type */
01514       } else if (cur_rs == ROADSIDE_BARREN) {
01515         cur_rs = new_rs[1];
01516       /* We're totally off limits, remove any installation and make barren land */
01517       } else {
01518         cur_rs = ROADSIDE_BARREN;
01519       }
01520       SetRoadside(tile, cur_rs);
01521       MarkTileDirtyByTile(tile);
01522     }
01523   } else if (IncreaseRoadWorksCounter(tile)) {
01524     TerminateRoadWorks(tile);
01525 
01526     if (_settings_game.economy.mod_road_rebuild) {
01527       /* Generate a nicer town surface */
01528       const RoadBits old_rb = GetAnyRoadBits(tile, ROADTYPE_ROAD);
01529       const RoadBits new_rb = CleanUpRoadBits(tile, old_rb);
01530 
01531       if (old_rb != new_rb) {
01532         RemoveRoad(tile, DC_EXEC | DC_AUTO | DC_NO_WATER, (old_rb ^ new_rb), ROADTYPE_ROAD, true);
01533       }
01534     }
01535 
01536     MarkTileDirtyByTile(tile);
01537   }
01538 }
01539 
01540 static bool ClickTile_Road(TileIndex tile)
01541 {
01542   if (!IsRoadDepot(tile)) return false;
01543 
01544   ShowDepotWindow(tile, VEH_ROAD);
01545   return true;
01546 }
01547 
01548 /* Converts RoadBits to TrackBits */
01549 static const TrackBits _road_trackbits[16] = {
01550   TRACK_BIT_NONE,                                  // ROAD_NONE
01551   TRACK_BIT_NONE,                                  // ROAD_NW
01552   TRACK_BIT_NONE,                                  // ROAD_SW
01553   TRACK_BIT_LEFT,                                  // ROAD_W
01554   TRACK_BIT_NONE,                                  // ROAD_SE
01555   TRACK_BIT_Y,                                     // ROAD_Y
01556   TRACK_BIT_LOWER,                                 // ROAD_S
01557   TRACK_BIT_LEFT | TRACK_BIT_LOWER | TRACK_BIT_Y,  // ROAD_Y | ROAD_SW
01558   TRACK_BIT_NONE,                                  // ROAD_NE
01559   TRACK_BIT_UPPER,                                 // ROAD_N
01560   TRACK_BIT_X,                                     // ROAD_X
01561   TRACK_BIT_LEFT | TRACK_BIT_UPPER | TRACK_BIT_X,  // ROAD_X | ROAD_NW
01562   TRACK_BIT_RIGHT,                                 // ROAD_E
01563   TRACK_BIT_RIGHT | TRACK_BIT_UPPER | TRACK_BIT_Y, // ROAD_Y | ROAD_NE
01564   TRACK_BIT_RIGHT | TRACK_BIT_LOWER | TRACK_BIT_X, // ROAD_X | ROAD_SE
01565   TRACK_BIT_ALL,                                   // ROAD_ALL
01566 };
01567 
01568 static TrackStatus GetTileTrackStatus_Road(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
01569 {
01570   TrackdirBits trackdirbits = TRACKDIR_BIT_NONE;
01571   TrackdirBits red_signals = TRACKDIR_BIT_NONE; // crossing barred
01572   switch (mode) {
01573     case TRANSPORT_RAIL:
01574       if (IsLevelCrossing(tile)) trackdirbits = TrackBitsToTrackdirBits(GetCrossingRailBits(tile));
01575       break;
01576 
01577     case TRANSPORT_ROAD:
01578       if ((GetRoadTypes(tile) & sub_mode) == 0) break;
01579       switch (GetRoadTileType(tile)) {
01580         case ROAD_TILE_NORMAL: {
01581           const uint drd_to_multiplier[DRD_END] = { 0x101, 0x100, 0x1, 0x0 };
01582           RoadType rt = (RoadType)FindFirstBit(sub_mode);
01583           RoadBits bits = GetRoadBits(tile, rt);
01584 
01585           /* no roadbit at this side of tile, return 0 */
01586           if (side != INVALID_DIAGDIR && (DiagDirToRoadBits(side) & bits) == 0) break;
01587 
01588           uint multiplier = drd_to_multiplier[rt == ROADTYPE_TRAM ? DRD_NONE : GetDisallowedRoadDirections(tile)];
01589           if (!HasRoadWorks(tile)) trackdirbits = (TrackdirBits)(_road_trackbits[bits] * multiplier);
01590           break;
01591         }
01592 
01593         case ROAD_TILE_CROSSING: {
01594           Axis axis = GetCrossingRoadAxis(tile);
01595 
01596           if (side != INVALID_DIAGDIR && axis != DiagDirToAxis(side)) break;
01597 
01598           trackdirbits = TrackBitsToTrackdirBits(AxisToTrackBits(axis));
01599           if (IsCrossingBarred(tile)) red_signals = trackdirbits;
01600           break;
01601         }
01602 
01603         default:
01604         case ROAD_TILE_DEPOT: {
01605           DiagDirection dir = GetRoadDepotDirection(tile);
01606 
01607           if (side != INVALID_DIAGDIR && side != dir) break;
01608 
01609           trackdirbits = TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir));
01610           break;
01611         }
01612       }
01613       break;
01614 
01615     default: break;
01616   }
01617   return CombineTrackStatus(trackdirbits, red_signals);
01618 }
01619 
01620 static const StringID _road_tile_strings[] = {
01621   STR_LAI_ROAD_DESCRIPTION_ROAD,
01622   STR_LAI_ROAD_DESCRIPTION_ROAD,
01623   STR_LAI_ROAD_DESCRIPTION_ROAD,
01624   STR_LAI_ROAD_DESCRIPTION_ROAD_WITH_STREETLIGHTS,
01625   STR_LAI_ROAD_DESCRIPTION_ROAD,
01626   STR_LAI_ROAD_DESCRIPTION_TREE_LINED_ROAD,
01627   STR_LAI_ROAD_DESCRIPTION_ROAD,
01628   STR_LAI_ROAD_DESCRIPTION_ROAD,
01629 };
01630 
01631 static void GetTileDesc_Road(TileIndex tile, TileDesc *td)
01632 {
01633   Owner rail_owner = INVALID_OWNER;
01634   Owner road_owner = INVALID_OWNER;
01635   Owner tram_owner = INVALID_OWNER;
01636 
01637   switch (GetRoadTileType(tile)) {
01638     case ROAD_TILE_CROSSING: {
01639       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_RAIL_LEVEL_CROSSING;
01640       RoadTypes rts = GetRoadTypes(tile);
01641       rail_owner = GetTileOwner(tile);
01642       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01643       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01644 
01645       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
01646       td->rail_speed = rti->max_speed;
01647 
01648       break;
01649     }
01650 
01651     case ROAD_TILE_DEPOT:
01652       td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_VEHICLE_DEPOT;
01653       road_owner = GetTileOwner(tile); // Tile has only one owner, roadtype does not matter
01654       td->build_date = Depot::GetByTile(tile)->build_date;
01655       break;
01656 
01657     default: {
01658       RoadTypes rts = GetRoadTypes(tile);
01659       td->str = (HasBit(rts, ROADTYPE_ROAD) ? _road_tile_strings[GetRoadside(tile)] : STR_LAI_ROAD_DESCRIPTION_TRAMWAY);
01660       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01661       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01662       break;
01663     }
01664   }
01665 
01666   /* Now we have to discover, if the tile has only one owner or many:
01667    *   - Find a first_owner of the tile. (Currently road or tram must be present, but this will break when the third type becomes available)
01668    *   - Compare the found owner with the other owners, and test if they differ.
01669    * Note: If road exists it will be the first_owner.
01670    */
01671   Owner first_owner = (road_owner == INVALID_OWNER ? tram_owner : road_owner);
01672   bool mixed_owners = (tram_owner != INVALID_OWNER && tram_owner != first_owner) || (rail_owner != INVALID_OWNER && rail_owner != first_owner);
01673 
01674   if (mixed_owners) {
01675     /* Multiple owners */
01676     td->owner_type[0] = (rail_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_RAIL_OWNER);
01677     td->owner[0] = rail_owner;
01678     td->owner_type[1] = (road_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_ROAD_OWNER);
01679     td->owner[1] = road_owner;
01680     td->owner_type[2] = (tram_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_TRAM_OWNER);
01681     td->owner[2] = tram_owner;
01682   } else {
01683     /* One to rule them all */
01684     td->owner[0] = first_owner;
01685   }
01686 }
01687 
01692 static const byte _roadveh_enter_depot_dir[4] = {
01693   TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE
01694 };
01695 
01696 static VehicleEnterTileStatus VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
01697 {
01698   switch (GetRoadTileType(tile)) {
01699     case ROAD_TILE_DEPOT: {
01700       if (v->type != VEH_ROAD) break;
01701 
01702       RoadVehicle *rv = RoadVehicle::From(v);
01703       if (rv->frame == RVC_DEPOT_STOP_FRAME &&
01704           _roadveh_enter_depot_dir[GetRoadDepotDirection(tile)] == rv->state) {
01705         rv->state = RVSB_IN_DEPOT;
01706         rv->vehstatus |= VS_HIDDEN;
01707         rv->direction = ReverseDir(rv->direction);
01708         if (rv->Next() == NULL) VehicleEnterDepot(rv->First());
01709         rv->tile = tile;
01710 
01711         InvalidateWindowData(WC_VEHICLE_DEPOT, rv->tile);
01712         return VETSB_ENTERED_WORMHOLE;
01713       }
01714       break;
01715     }
01716 
01717     default: break;
01718   }
01719   return VETSB_CONTINUE;
01720 }
01721 
01722 
01723 static void ChangeTileOwner_Road(TileIndex tile, Owner old_owner, Owner new_owner)
01724 {
01725   if (IsRoadDepot(tile)) {
01726     if (GetTileOwner(tile) == old_owner) {
01727       if (new_owner == INVALID_OWNER) {
01728         DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
01729       } else {
01730         /* A road depot has two road bits. No need to dirty windows here, we'll redraw the whole screen anyway. */
01731         RoadType rt = (RoadType)FIND_FIRST_BIT(GetRoadTypes(tile));
01732         Company::Get(old_owner)->infrastructure.road[rt] -= 2;
01733         Company::Get(new_owner)->infrastructure.road[rt] += 2;
01734 
01735         SetTileOwner(tile, new_owner);
01736       }
01737     }
01738     return;
01739   }
01740 
01741   for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
01742     /* Update all roadtypes, no matter if they are present */
01743     if (GetRoadOwner(tile, rt) == old_owner) {
01744       if (HasTileRoadType(tile, rt)) {
01745         /* A level crossing has two road bits. No need to dirty windows here, we'll redraw the whole screen anyway. */
01746         uint num_bits = IsLevelCrossing(tile) ? 2 : CountBits(GetRoadBits(tile, rt));
01747         Company::Get(old_owner)->infrastructure.road[rt] -= num_bits;
01748         if (new_owner != INVALID_OWNER) Company::Get(new_owner)->infrastructure.road[rt] += num_bits;
01749       }
01750 
01751       SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
01752     }
01753   }
01754 
01755   if (IsLevelCrossing(tile)) {
01756     if (GetTileOwner(tile) == old_owner) {
01757       if (new_owner == INVALID_OWNER) {
01758         DoCommand(tile, 0, GetCrossingRailTrack(tile), DC_EXEC | DC_BANKRUPT, CMD_REMOVE_SINGLE_RAIL);
01759       } else {
01760         /* Update infrastructure counts. No need to dirty windows here, we'll redraw the whole screen anyway. */
01761         Company::Get(old_owner)->infrastructure.rail[GetRailType(tile)] -= LEVELCROSSING_TRACKBIT_FACTOR;
01762         Company::Get(new_owner)->infrastructure.rail[GetRailType(tile)] += LEVELCROSSING_TRACKBIT_FACTOR;
01763 
01764         SetTileOwner(tile, new_owner);
01765       }
01766     }
01767   }
01768 }
01769 
01770 static CommandCost TerraformTile_Road(TileIndex tile, DoCommandFlag flags, int z_new, Slope tileh_new)
01771 {
01772   if (_settings_game.construction.build_on_slopes && AutoslopeEnabled()) {
01773     switch (GetRoadTileType(tile)) {
01774       case ROAD_TILE_CROSSING:
01775         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]);
01776         break;
01777 
01778       case ROAD_TILE_DEPOT:
01779         if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRoadDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01780         break;
01781 
01782       case ROAD_TILE_NORMAL: {
01783         RoadBits bits = GetAllRoadBits(tile);
01784         RoadBits bits_copy = bits;
01785         /* Check if the slope-road_bits combination is valid at all, i.e. it is safe to call GetRoadFoundation(). */
01786         if (CheckRoadSlope(tileh_new, &bits_copy, ROAD_NONE, ROAD_NONE).Succeeded()) {
01787           /* CheckRoadSlope() sometimes changes the road_bits, if it does not agree with them. */
01788           if (bits == bits_copy) {
01789             int z_old;
01790             Slope tileh_old = GetTileSlope(tile, &z_old);
01791 
01792             /* Get the slope on top of the foundation */
01793             z_old += ApplyFoundationToSlope(GetRoadFoundation(tileh_old, bits), &tileh_old);
01794             z_new += ApplyFoundationToSlope(GetRoadFoundation(tileh_new, bits), &tileh_new);
01795 
01796             /* The surface slope must not be changed */
01797             if ((z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
01798           }
01799         }
01800         break;
01801       }
01802 
01803       default: NOT_REACHED();
01804     }
01805   }
01806 
01807   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
01808 }
01809 
01811 extern const TileTypeProcs _tile_type_road_procs = {
01812   DrawTile_Road,           // draw_tile_proc
01813   GetSlopePixelZ_Road,     // get_slope_z_proc
01814   ClearTile_Road,          // clear_tile_proc
01815   NULL,                    // add_accepted_cargo_proc
01816   GetTileDesc_Road,        // get_tile_desc_proc
01817   GetTileTrackStatus_Road, // get_tile_track_status_proc
01818   ClickTile_Road,          // click_tile_proc
01819   NULL,                    // animate_tile_proc
01820   TileLoop_Road,           // tile_loop_proc
01821   ChangeTileOwner_Road,    // change_tile_owner_proc
01822   NULL,                    // add_produced_cargo_proc
01823   VehicleEnter_Road,       // vehicle_enter_tile_proc
01824   GetFoundation_Road,      // get_foundation_proc
01825   TerraformTile_Road,      // terraform_tile_proc
01826 };