rail_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 "viewport_func.h"
00015 #include "command_func.h"
00016 #include "depot_base.h"
00017 #include "pathfinder/yapf/yapf_cache.h"
00018 #include "newgrf_debug.h"
00019 #include "newgrf_railtype.h"
00020 #include "train.h"
00021 #include "autoslope.h"
00022 #include "water.h"
00023 #include "tunnelbridge_map.h"
00024 #include "window_func.h"
00025 #include "vehicle_func.h"
00026 #include "sound_func.h"
00027 #include "tunnelbridge.h"
00028 #include "elrail_func.h"
00029 #include "town.h"
00030 #include "pbs.h"
00031 #include "company_base.h"
00032 #include "core/backup_type.hpp"
00033 #include "date_func.h"
00034 
00035 #include "table/strings.h"
00036 #include "table/railtypes.h"
00037 #include "table/track_land.h"
00038 
00040 typedef SmallVector<Train *, 16> TrainList;
00041 
00042 RailtypeInfo _railtypes[RAILTYPE_END];
00043 
00044 assert_compile(sizeof(_original_railtypes) <= sizeof(_railtypes));
00045 
00049 void ResetRailTypes()
00050 {
00051   memset(_railtypes, 0, sizeof(_railtypes));
00052   memcpy(_railtypes, _original_railtypes, sizeof(_original_railtypes));
00053 }
00054 
00055 void ResolveRailTypeGUISprites(RailtypeInfo *rti)
00056 {
00057   SpriteID cursors_base = GetCustomRailSprite(rti, INVALID_TILE, RTSG_CURSORS);
00058   if (cursors_base != 0) {
00059     rti->gui_sprites.build_ns_rail = cursors_base +  0;
00060     rti->gui_sprites.build_x_rail  = cursors_base +  1;
00061     rti->gui_sprites.build_ew_rail = cursors_base +  2;
00062     rti->gui_sprites.build_y_rail  = cursors_base +  3;
00063     rti->gui_sprites.auto_rail     = cursors_base +  4;
00064     rti->gui_sprites.build_depot   = cursors_base +  5;
00065     rti->gui_sprites.build_tunnel  = cursors_base +  6;
00066     rti->gui_sprites.convert_rail  = cursors_base +  7;
00067     rti->cursor.rail_ns   = cursors_base +  8;
00068     rti->cursor.rail_swne = cursors_base +  9;
00069     rti->cursor.rail_ew   = cursors_base + 10;
00070     rti->cursor.rail_nwse = cursors_base + 11;
00071     rti->cursor.autorail  = cursors_base + 12;
00072     rti->cursor.depot     = cursors_base + 13;
00073     rti->cursor.tunnel    = cursors_base + 14;
00074     rti->cursor.convert   = cursors_base + 15;
00075   }
00076 }
00077 
00081 void InitRailTypes()
00082 {
00083   for (RailType rt = RAILTYPE_BEGIN; rt != RAILTYPE_END; rt++) {
00084     RailtypeInfo *rti = &_railtypes[rt];
00085     ResolveRailTypeGUISprites(rti);
00086   }
00087 }
00088 
00092 RailType AllocateRailType(RailTypeLabel label)
00093 {
00094   for (RailType rt = RAILTYPE_BEGIN; rt != RAILTYPE_END; rt++) {
00095     RailtypeInfo *rti = &_railtypes[rt];
00096 
00097     if (rti->label == 0) {
00098       /* Set up new rail type */
00099       memcpy(rti, &_railtypes[RAILTYPE_RAIL], sizeof(*rti));
00100       rti->label = label;
00101 
00102       /* Make us compatible with ourself. */
00103       rti->powered_railtypes    = (RailTypes)(1 << rt);
00104       rti->compatible_railtypes = (RailTypes)(1 << rt);
00105 
00106       /* We also introduce ourself. */
00107       rti->introduces_railtypes = (RailTypes)(1 << rt);
00108 
00109       /* Default sort order; order of allocation, but with some
00110        * offsets so it's easier for NewGRF to pick a spot without
00111        * changing the order of other (original) rail types.
00112        * The << is so you can place other railtypes in between the
00113        * other railtypes, the 7 is to be able to place something
00114        * before the first (default) rail type. */
00115       rti->sorting_order = rt << 4 | 7;
00116       return rt;
00117     }
00118   }
00119 
00120   return INVALID_RAILTYPE;
00121 }
00122 
00123 static const byte _track_sloped_sprites[14] = {
00124   14, 15, 22, 13,
00125    0, 21, 17, 12,
00126   23,  0, 18, 20,
00127   19, 16
00128 };
00129 
00130 
00131 /*         4
00132  *     ---------
00133  *    |\       /|
00134  *    | \    1/ |
00135  *    |  \   /  |
00136  *    |   \ /   |
00137  *  16|    \    |32
00138  *    |   / \2  |
00139  *    |  /   \  |
00140  *    | /     \ |
00141  *    |/       \|
00142  *     ---------
00143  *         8
00144  */
00145 
00146 
00147 
00148 /* MAP2 byte:    abcd???? => Signal On? Same coding as map3lo
00149  * MAP3LO byte:  abcd???? => Signal Exists?
00150  *               a and b are for diagonals, upper and left,
00151  *               one for each direction. (ie a == NE->SW, b ==
00152  *               SW->NE, or v.v., I don't know. b and c are
00153  *               similar for lower and right.
00154  * MAP2 byte:    ????abcd => Type of ground.
00155  * MAP3LO byte:  ????abcd => Type of rail.
00156  * MAP5:         00abcdef => rail
00157  *               01abcdef => rail w/ signals
00158  *               10uuuuuu => unused
00159  *               11uuuudd => rail depot
00160  */
00161 
00170 static CommandCost EnsureNoTrainOnTrack(TileIndex tile, Track track)
00171 {
00172   TrackBits rail_bits = TrackToTrackBits(track);
00173   return EnsureNoTrainOnTrackBits(tile, rail_bits);
00174 }
00175 
00183 static CommandCost CheckTrackCombination(TileIndex tile, TrackBits to_build, uint flags)
00184 {
00185   if (!IsPlainRail(tile)) return_cmd_error(STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION);
00186 
00187   /* So, we have a tile with tracks on it (and possibly signals). Let's see
00188    * what tracks first */
00189   TrackBits current = GetTrackBits(tile); // The current track layout.
00190   TrackBits future = current | to_build;  // The track layout we want to build.
00191 
00192   /* Are we really building something new? */
00193   if (current == future) {
00194     /* Nothing new is being built */
00195     return_cmd_error(STR_ERROR_ALREADY_BUILT);
00196   }
00197 
00198   /* Let's see if we may build this */
00199   if ((flags & DC_NO_RAIL_OVERLAP) || HasSignals(tile)) {
00200     /* If we are not allowed to overlap (flag is on for ai companies or we have
00201      * signals on the tile), check that */
00202     if (future != TRACK_BIT_HORZ && future != TRACK_BIT_VERT) {
00203       return_cmd_error((flags & DC_NO_RAIL_OVERLAP) ? STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION : STR_ERROR_MUST_REMOVE_SIGNALS_FIRST);
00204     }
00205   }
00206   /* Normally, we may overlap and any combination is valid */
00207   return CommandCost();
00208 }
00209 
00210 
00212 static const TrackBits _valid_tracks_without_foundation[15] = {
00213   TRACK_BIT_ALL,
00214   TRACK_BIT_RIGHT,
00215   TRACK_BIT_UPPER,
00216   TRACK_BIT_X,
00217 
00218   TRACK_BIT_LEFT,
00219   TRACK_BIT_NONE,
00220   TRACK_BIT_Y,
00221   TRACK_BIT_LOWER,
00222 
00223   TRACK_BIT_LOWER,
00224   TRACK_BIT_Y,
00225   TRACK_BIT_NONE,
00226   TRACK_BIT_LEFT,
00227 
00228   TRACK_BIT_X,
00229   TRACK_BIT_UPPER,
00230   TRACK_BIT_RIGHT,
00231 };
00232 
00234 static const TrackBits _valid_tracks_on_leveled_foundation[15] = {
00235   TRACK_BIT_NONE,
00236   TRACK_BIT_LEFT,
00237   TRACK_BIT_LOWER,
00238   TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,
00239 
00240   TRACK_BIT_RIGHT,
00241   TRACK_BIT_ALL,
00242   TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,
00243   TRACK_BIT_ALL,
00244 
00245   TRACK_BIT_UPPER,
00246   TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,
00247   TRACK_BIT_ALL,
00248   TRACK_BIT_ALL,
00249 
00250   TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,
00251   TRACK_BIT_ALL,
00252   TRACK_BIT_ALL
00253 };
00254 
00262 Foundation GetRailFoundation(Slope tileh, TrackBits bits)
00263 {
00264   if (bits == TRACK_BIT_NONE) return FOUNDATION_NONE;
00265 
00266   if (IsSteepSlope(tileh)) {
00267     /* Test for inclined foundations */
00268     if (bits == TRACK_BIT_X) return FOUNDATION_INCLINED_X;
00269     if (bits == TRACK_BIT_Y) return FOUNDATION_INCLINED_Y;
00270 
00271     /* Get higher track */
00272     Corner highest_corner = GetHighestSlopeCorner(tileh);
00273     TrackBits higher_track = CornerToTrackBits(highest_corner);
00274 
00275     /* Only higher track? */
00276     if (bits == higher_track) return HalftileFoundation(highest_corner);
00277 
00278     /* Overlap with higher track? */
00279     if (TracksOverlap(bits | higher_track)) return FOUNDATION_INVALID;
00280 
00281     /* either lower track or both higher and lower track */
00282     return ((bits & higher_track) != 0 ? FOUNDATION_STEEP_BOTH : FOUNDATION_STEEP_LOWER);
00283   } else {
00284     if ((~_valid_tracks_without_foundation[tileh] & bits) == 0) return FOUNDATION_NONE;
00285 
00286     bool valid_on_leveled = ((~_valid_tracks_on_leveled_foundation[tileh] & bits) == 0);
00287 
00288     Corner track_corner;
00289     switch (bits) {
00290       case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
00291       case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
00292       case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
00293       case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
00294 
00295       case TRACK_BIT_HORZ:
00296         if (tileh == SLOPE_N) return HalftileFoundation(CORNER_N);
00297         if (tileh == SLOPE_S) return HalftileFoundation(CORNER_S);
00298         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00299 
00300       case TRACK_BIT_VERT:
00301         if (tileh == SLOPE_W) return HalftileFoundation(CORNER_W);
00302         if (tileh == SLOPE_E) return HalftileFoundation(CORNER_E);
00303         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00304 
00305       case TRACK_BIT_X:
00306         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_X;
00307         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00308 
00309       case TRACK_BIT_Y:
00310         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_Y;
00311         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00312 
00313       default:
00314         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00315     }
00316     /* Single diagonal track */
00317 
00318     /* Track must be at least valid on leveled foundation */
00319     if (!valid_on_leveled) return FOUNDATION_INVALID;
00320 
00321     /* If slope has three raised corners, build leveled foundation */
00322     if (IsSlopeWithThreeCornersRaised(tileh)) return FOUNDATION_LEVELED;
00323 
00324     /* If neighboured corners of track_corner are lowered, build halftile foundation */
00325     if ((tileh & SlopeWithThreeCornersRaised(OppositeCorner(track_corner))) == SlopeWithOneCornerRaised(track_corner)) return HalftileFoundation(track_corner);
00326 
00327     /* else special anti-zig-zag foundation */
00328     return SpecialRailFoundation(track_corner);
00329   }
00330 }
00331 
00332 
00342 static CommandCost CheckRailSlope(Slope tileh, TrackBits rail_bits, TrackBits existing, TileIndex tile)
00343 {
00344   /* don't allow building on the lower side of a coast */
00345   if (GetFloodingBehaviour(tile) != FLOOD_NONE) {
00346     if (!IsSteepSlope(tileh) && ((~_valid_tracks_on_leveled_foundation[tileh] & (rail_bits | existing)) != 0)) return_cmd_error(STR_ERROR_CAN_T_BUILD_ON_WATER);
00347   }
00348 
00349   Foundation f_new = GetRailFoundation(tileh, rail_bits | existing);
00350 
00351   /* check track/slope combination */
00352   if ((f_new == FOUNDATION_INVALID) ||
00353       ((f_new != FOUNDATION_NONE) && (!_settings_game.construction.build_on_slopes))) {
00354     return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00355   }
00356 
00357   Foundation f_old = GetRailFoundation(tileh, existing);
00358   return CommandCost(EXPENSES_CONSTRUCTION, f_new != f_old ? _price[PR_BUILD_FOUNDATION] : (Money)0);
00359 }
00360 
00361 /* Validate functions for rail building */
00362 static inline bool ValParamTrackOrientation(Track track)
00363 {
00364   return IsValidTrack(track);
00365 }
00366 
00376 CommandCost CmdBuildSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00377 {
00378   RailType railtype = Extract<RailType, 0, 4>(p1);
00379   Track track = Extract<Track, 0, 3>(p2);
00380   CommandCost cost(EXPENSES_CONSTRUCTION);
00381 
00382   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
00383 
00384   Slope tileh = GetTileSlope(tile, NULL);
00385   TrackBits trackbit = TrackToTrackBits(track);
00386 
00387   switch (GetTileType(tile)) {
00388     case MP_RAILWAY: {
00389       CommandCost ret = CheckTileOwnership(tile);
00390       if (ret.Failed()) return ret;
00391 
00392       if (!IsPlainRail(tile)) return CMD_ERROR;
00393 
00394       if (!IsCompatibleRail(GetRailType(tile), railtype)) return_cmd_error(STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION);
00395 
00396       ret = CheckTrackCombination(tile, trackbit, flags);
00397       if (ret.Succeeded()) ret = EnsureNoTrainOnTrack(tile, track);
00398       if (ret.Failed()) return ret;
00399 
00400       ret = CheckRailSlope(tileh, trackbit, GetTrackBits(tile), tile);
00401       if (ret.Failed()) return ret;
00402       cost.AddCost(ret);
00403 
00404       /* If the rail types don't match, try to convert only if engines of
00405        * the new rail type are not powered on the present rail type and engines of
00406        * the present rail type are powered on the new rail type. */
00407       if (GetRailType(tile) != railtype && !HasPowerOnRail(railtype, GetRailType(tile))) {
00408         if (HasPowerOnRail(GetRailType(tile), railtype)) {
00409           ret = DoCommand(tile, tile, railtype, flags, CMD_CONVERT_RAIL);
00410           if (ret.Failed()) return ret;
00411           cost.AddCost(ret);
00412         } else {
00413           return CMD_ERROR;
00414         }
00415       }
00416 
00417       if (flags & DC_EXEC) {
00418         SetRailGroundType(tile, RAIL_GROUND_BARREN);
00419         SetTrackBits(tile, GetTrackBits(tile) | trackbit);
00420       }
00421       break;
00422     }
00423 
00424     case MP_ROAD: {
00425       /* Level crossings may only be built on these slopes */
00426       if (!HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh)) return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00427 
00428       CommandCost ret = EnsureNoVehicleOnGround(tile);
00429       if (ret.Failed()) return ret;
00430 
00431       if (IsNormalRoad(tile)) {
00432         if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00433 
00434         if (GetDisallowedRoadDirections(tile) != DRD_NONE) return_cmd_error(STR_ERROR_CROSSING_ON_ONEWAY_ROAD);
00435 
00436         if (RailNoLevelCrossings(railtype)) return_cmd_error(STR_ERROR_CROSSING_DISALLOWED);
00437 
00438         RoadTypes roadtypes = GetRoadTypes(tile);
00439         RoadBits road = GetRoadBits(tile, ROADTYPE_ROAD);
00440         RoadBits tram = GetRoadBits(tile, ROADTYPE_TRAM);
00441         switch (roadtypes) {
00442           default: break;
00443           case ROADTYPES_TRAM:
00444             /* Tram crossings must always have road. */
00445             if (flags & DC_EXEC) SetRoadOwner(tile, ROADTYPE_ROAD, _current_company);
00446             roadtypes |= ROADTYPES_ROAD;
00447             break;
00448 
00449           case ROADTYPES_ALL:
00450             if (road != tram) return CMD_ERROR;
00451             break;
00452         }
00453 
00454         road |= tram;
00455 
00456         if ((track == TRACK_X && road == ROAD_Y) ||
00457             (track == TRACK_Y && road == ROAD_X)) {
00458           if (flags & DC_EXEC) {
00459             MakeRoadCrossing(tile, GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), _current_company, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, roadtypes, GetTownIndex(tile));
00460             UpdateLevelCrossing(tile, false);
00461           }
00462           break;
00463         }
00464       }
00465 
00466       if (IsLevelCrossing(tile) && GetCrossingRailBits(tile) == trackbit) {
00467         return_cmd_error(STR_ERROR_ALREADY_BUILT);
00468       }
00469       /* FALL THROUGH */
00470     }
00471 
00472     default: {
00473       /* Will there be flat water on the lower halftile? */
00474       bool water_ground = IsTileType(tile, MP_WATER) && IsSlopeWithOneCornerRaised(tileh);
00475 
00476       CommandCost ret = CheckRailSlope(tileh, trackbit, TRACK_BIT_NONE, tile);
00477       if (ret.Failed()) return ret;
00478       cost.AddCost(ret);
00479 
00480       ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00481       if (ret.Failed()) return ret;
00482       cost.AddCost(ret);
00483 
00484       if (water_ground) {
00485         cost.AddCost(-_price[PR_CLEAR_WATER]);
00486         cost.AddCost(_price[PR_CLEAR_ROUGH]);
00487       }
00488 
00489       if (flags & DC_EXEC) {
00490         MakeRailNormal(tile, _current_company, trackbit, railtype);
00491         if (water_ground) SetRailGroundType(tile, RAIL_GROUND_WATER);
00492       }
00493       break;
00494     }
00495   }
00496 
00497   if (flags & DC_EXEC) {
00498     MarkTileDirtyByTile(tile);
00499     AddTrackToSignalBuffer(tile, track, _current_company);
00500     YapfNotifyTrackLayoutChange(tile, track);
00501   }
00502 
00503   cost.AddCost(RailBuildCost(railtype));
00504   return cost;
00505 }
00506 
00516 CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00517 {
00518   Track track = Extract<Track, 0, 3>(p2);
00519   CommandCost cost(EXPENSES_CONSTRUCTION);
00520   bool crossing = false;
00521 
00522   if (!ValParamTrackOrientation(track)) return CMD_ERROR;
00523   TrackBits trackbit = TrackToTrackBits(track);
00524 
00525   /* Need to read tile owner now because it may change when the rail is removed
00526    * Also, in case of floods, _current_company != owner
00527    * There may be invalid tiletype even in exec run (when removing long track),
00528    * so do not call GetTileOwner(tile) in any case here */
00529   Owner owner = INVALID_OWNER;
00530 
00531   Train *v = NULL;
00532 
00533   switch (GetTileType(tile)) {
00534     case MP_ROAD: {
00535       if (!IsLevelCrossing(tile) || GetCrossingRailBits(tile) != trackbit) return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
00536 
00537       if (_current_company != OWNER_WATER) {
00538         CommandCost ret = CheckTileOwnership(tile);
00539         if (ret.Failed()) return ret;
00540       }
00541 
00542       if (!(flags & DC_BANKRUPT)) {
00543         CommandCost ret = EnsureNoVehicleOnGround(tile);
00544         if (ret.Failed()) return ret;
00545       }
00546 
00547       cost.AddCost(RailClearCost(GetRailType(tile)));
00548 
00549       if (flags & DC_EXEC) {
00550         if (HasReservedTracks(tile, trackbit)) {
00551           v = GetTrainForReservation(tile, track);
00552           if (v != NULL) FreeTrainTrackReservation(v);
00553         }
00554         owner = GetTileOwner(tile);
00555         MakeRoadNormal(tile, GetCrossingRoadBits(tile), GetRoadTypes(tile), GetTownIndex(tile), GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM));
00556         DeleteNewGRFInspectWindow(GSF_RAILTYPES, tile);
00557       }
00558       break;
00559     }
00560 
00561     case MP_RAILWAY: {
00562       TrackBits present;
00563       /* There are no rails present at depots. */
00564       if (!IsPlainRail(tile)) return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
00565 
00566       if (_current_company != OWNER_WATER) {
00567         CommandCost ret = CheckTileOwnership(tile);
00568         if (ret.Failed()) return ret;
00569       }
00570 
00571       CommandCost ret = EnsureNoTrainOnTrack(tile, track);
00572       if (ret.Failed()) return ret;
00573 
00574       present = GetTrackBits(tile);
00575       if ((present & trackbit) == 0) return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
00576       if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
00577 
00578       cost.AddCost(RailClearCost(GetRailType(tile)));
00579 
00580       /* Charge extra to remove signals on the track, if they are there */
00581       if (HasSignalOnTrack(tile, track)) {
00582         cost.AddCost(DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS));
00583       }
00584 
00585       if (flags & DC_EXEC) {
00586         if (HasReservedTracks(tile, trackbit)) {
00587           v = GetTrainForReservation(tile, track);
00588           if (v != NULL) FreeTrainTrackReservation(v);
00589         }
00590         owner = GetTileOwner(tile);
00591         present ^= trackbit;
00592         if (present == 0) {
00593           Slope tileh = GetTileSlope(tile, NULL);
00594           /* If there is flat water on the lower halftile, convert the tile to shore so the water remains */
00595           if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh)) {
00596             MakeShore(tile);
00597           } else {
00598             DoClearSquare(tile);
00599           }
00600           DeleteNewGRFInspectWindow(GSF_RAILTYPES, tile);
00601         } else {
00602           SetTrackBits(tile, present);
00603           SetTrackReservation(tile, GetRailReservationTrackBits(tile) & present);
00604         }
00605       }
00606       break;
00607     }
00608 
00609     default: return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
00610   }
00611 
00612   if (flags & DC_EXEC) {
00613     /* if we got that far, 'owner' variable is set correctly */
00614     assert(Company::IsValidID(owner));
00615 
00616     MarkTileDirtyByTile(tile);
00617     if (crossing) {
00618       /* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we
00619        * are removing one of these pieces, we'll need to update signals for
00620        * both directions explicitly, as after the track is removed it won't
00621        * 'connect' with the other piece. */
00622       AddTrackToSignalBuffer(tile, TRACK_X, owner);
00623       AddTrackToSignalBuffer(tile, TRACK_Y, owner);
00624       YapfNotifyTrackLayoutChange(tile, TRACK_X);
00625       YapfNotifyTrackLayoutChange(tile, TRACK_Y);
00626     } else {
00627       AddTrackToSignalBuffer(tile, track, owner);
00628       YapfNotifyTrackLayoutChange(tile, track);
00629     }
00630 
00631     if (v != NULL) TryPathReserve(v, true);
00632   }
00633 
00634   return cost;
00635 }
00636 
00637 
00645 bool FloodHalftile(TileIndex t)
00646 {
00647   assert(IsPlainRailTile(t));
00648 
00649   bool flooded = false;
00650   if (GetRailGroundType(t) == RAIL_GROUND_WATER) return flooded;
00651 
00652   Slope tileh = GetTileSlope(t, NULL);
00653   TrackBits rail_bits = GetTrackBits(t);
00654 
00655   if (IsSlopeWithOneCornerRaised(tileh)) {
00656     TrackBits lower_track = CornerToTrackBits(OppositeCorner(GetHighestSlopeCorner(tileh)));
00657 
00658     TrackBits to_remove = lower_track & rail_bits;
00659     if (to_remove != 0) {
00660       Backup<CompanyByte> cur_company(_current_company, OWNER_WATER, FILE_LINE);
00661       flooded = DoCommand(t, 0, FIND_FIRST_BIT(to_remove), DC_EXEC, CMD_REMOVE_SINGLE_RAIL).Succeeded();
00662       cur_company.Restore();
00663       if (!flooded) return flooded; // not yet floodable
00664       rail_bits = rail_bits & ~to_remove;
00665       if (rail_bits == 0) {
00666         MakeShore(t);
00667         MarkTileDirtyByTile(t);
00668         return flooded;
00669       }
00670     }
00671 
00672     if (IsNonContinuousFoundation(GetRailFoundation(tileh, rail_bits))) {
00673       flooded = true;
00674       SetRailGroundType(t, RAIL_GROUND_WATER);
00675       MarkTileDirtyByTile(t);
00676     }
00677   } else {
00678     /* Make shore on steep slopes and 'three-corners-raised'-slopes. */
00679     if (ApplyFoundationToSlope(GetRailFoundation(tileh, rail_bits), &tileh) == 0) {
00680       if (IsSteepSlope(tileh) || IsSlopeWithThreeCornersRaised(tileh)) {
00681         flooded = true;
00682         SetRailGroundType(t, RAIL_GROUND_WATER);
00683         MarkTileDirtyByTile(t);
00684       }
00685     }
00686   }
00687   return flooded;
00688 }
00689 
00690 static const TileIndexDiffC _trackdelta[] = {
00691   { -1,  0 }, {  0,  1 }, { -1,  0 }, {  0,  1 }, {  1,  0 }, {  0,  1 },
00692   {  0,  0 },
00693   {  0,  0 },
00694   {  1,  0 }, {  0, -1 }, {  0, -1 }, {  1,  0 }, {  0, -1 }, { -1,  0 },
00695   {  0,  0 },
00696   {  0,  0 }
00697 };
00698 
00699 
00700 static CommandCost ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)
00701 {
00702   int x = TileX(start);
00703   int y = TileY(start);
00704   int ex = TileX(end);
00705   int ey = TileY(end);
00706 
00707   if (!ValParamTrackOrientation(TrackdirToTrack(*trackdir))) return CMD_ERROR;
00708 
00709   /* calculate delta x,y from start to end tile */
00710   int dx = ex - x;
00711   int dy = ey - y;
00712 
00713   /* calculate delta x,y for the first direction */
00714   int trdx = _trackdelta[*trackdir].x;
00715   int trdy = _trackdelta[*trackdir].y;
00716 
00717   if (!IsDiagonalTrackdir(*trackdir)) {
00718     trdx += _trackdelta[*trackdir ^ 1].x;
00719     trdy += _trackdelta[*trackdir ^ 1].y;
00720   }
00721 
00722   /* validate the direction */
00723   while ((trdx <= 0 && dx > 0) ||
00724       (trdx >= 0 && dx < 0) ||
00725       (trdy <= 0 && dy > 0) ||
00726       (trdy >= 0 && dy < 0)) {
00727     if (!HasBit(*trackdir, 3)) { // first direction is invalid, try the other
00728       SetBit(*trackdir, 3); // reverse the direction
00729       trdx = -trdx;
00730       trdy = -trdy;
00731     } else { // other direction is invalid too, invalid drag
00732       return CMD_ERROR;
00733     }
00734   }
00735 
00736   /* (for diagonal tracks, this is already made sure of by above test), but:
00737    * for non-diagonal tracks, check if the start and end tile are on 1 line */
00738   if (!IsDiagonalTrackdir(*trackdir)) {
00739     trdx = _trackdelta[*trackdir].x;
00740     trdy = _trackdelta[*trackdir].y;
00741     if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx)) return CMD_ERROR;
00742   }
00743 
00744   return CommandCost();
00745 }
00746 
00760 static CommandCost CmdRailTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00761 {
00762   CommandCost total_cost(EXPENSES_CONSTRUCTION);
00763   Track track = Extract<Track, 4, 3>(p2);
00764   bool remove = HasBit(p2, 7);
00765   RailType railtype = Extract<RailType, 0, 4>(p2);
00766 
00767   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
00768   if (p1 >= MapSize()) return CMD_ERROR;
00769   TileIndex end_tile = p1;
00770   Trackdir trackdir = TrackToTrackdir(track);
00771 
00772   CommandCost ret = ValidateAutoDrag(&trackdir, tile, end_tile);
00773   if (ret.Failed()) return ret;
00774 
00775   if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, tile);
00776 
00777   bool had_success = false;
00778   CommandCost last_error = CMD_ERROR;
00779   for (;;) {
00780     CommandCost ret = DoCommand(tile, railtype, TrackdirToTrack(trackdir), flags, remove ? CMD_REMOVE_SINGLE_RAIL : CMD_BUILD_SINGLE_RAIL);
00781 
00782     if (ret.Failed()) {
00783       last_error = ret;
00784       if (last_error.GetErrorMessage() != STR_ERROR_ALREADY_BUILT && !remove) {
00785         if (HasBit(p2, 8)) return last_error;
00786         break;
00787       }
00788 
00789       /* Ownership errors are more important. */
00790       if (last_error.GetErrorMessage() == STR_ERROR_OWNED_BY && remove) break;
00791     } else {
00792       had_success = true;
00793       total_cost.AddCost(ret);
00794     }
00795 
00796     if (tile == end_tile) break;
00797 
00798     tile += ToTileIndexDiff(_trackdelta[trackdir]);
00799 
00800     /* toggle railbit for the non-diagonal tracks */
00801     if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
00802   }
00803 
00804   if (had_success) return total_cost;
00805   return last_error;
00806 }
00807 
00822 CommandCost CmdBuildRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00823 {
00824   return CmdRailTrackHelper(tile, flags, p1, ClrBit(p2, 7), text);
00825 }
00826 
00841 CommandCost CmdRemoveRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00842 {
00843   return CmdRailTrackHelper(tile, flags, p1, SetBit(p2, 7), text);
00844 }
00845 
00858 CommandCost CmdBuildTrainDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00859 {
00860   /* check railtype and valid direction for depot (0 through 3), 4 in total */
00861   RailType railtype = Extract<RailType, 0, 4>(p1);
00862   if (!ValParamRailtype(railtype)) return CMD_ERROR;
00863 
00864   Slope tileh = GetTileSlope(tile, NULL);
00865 
00866   DiagDirection dir = Extract<DiagDirection, 0, 2>(p2);
00867 
00868   /* Prohibit construction if
00869    * The tile is non-flat AND
00870    * 1) build-on-slopes is disabled
00871    * 2) the tile is steep i.e. spans two height levels
00872    * 3) the exit points in the wrong direction
00873    */
00874 
00875   if (tileh != SLOPE_FLAT && (
00876         !_settings_game.construction.build_on_slopes ||
00877         IsSteepSlope(tileh) ||
00878         !CanBuildDepotByTileh(dir, tileh)
00879       )) {
00880     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00881   }
00882 
00883   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00884   if (cost.Failed()) return cost;
00885 
00886   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
00887 
00888   if (!Depot::CanAllocateItem()) return CMD_ERROR;
00889 
00890   if (flags & DC_EXEC) {
00891     Depot *d = new Depot(tile);
00892     d->build_date = _date;
00893 
00894     MakeRailDepot(tile, _current_company, d->index, dir, railtype);
00895     MarkTileDirtyByTile(tile);
00896     MakeDefaultName(d);
00897 
00898     AddSideToSignalBuffer(tile, INVALID_DIAGDIR, _current_company);
00899     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
00900   }
00901 
00902   cost.AddCost(_price[PR_BUILD_DEPOT_TRAIN]);
00903   cost.AddCost(RailBuildCost(railtype));
00904   return cost;
00905 }
00906 
00928 CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00929 {
00930   Track track = Extract<Track, 0, 3>(p1);
00931   bool ctrl_pressed = HasBit(p1, 3); // was the CTRL button pressed
00932   SignalVariant sigvar = (ctrl_pressed ^ HasBit(p1, 4)) ? SIG_SEMAPHORE : SIG_ELECTRIC; // the signal variant of the new signal
00933   SignalType sigtype = Extract<SignalType, 5, 3>(p1); // the signal type of the new signal
00934   bool convert_signal = HasBit(p1, 8); // convert button pressed
00935   SignalType cycle_start = Extract<SignalType, 9, 3>(p1);
00936   SignalType cycle_stop = Extract<SignalType, 12, 3>(p1);
00937   uint num_dir_cycle = GB(p1, 15, 2);
00938 
00939   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
00940   if (cycle_start > cycle_stop || cycle_stop > SIGTYPE_LAST) return CMD_ERROR;
00941 
00942   /* You can only build signals on plain rail tiles, and the selected track must exist */
00943   if (!ValParamTrackOrientation(track) || !IsPlainRailTile(tile) ||
00944       !HasTrack(tile, track)) {
00945     return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
00946   }
00947   CommandCost ret = EnsureNoTrainOnTrack(tile, track);
00948   if (ret.Failed()) return ret;
00949 
00950   /* Protect against invalid signal copying */
00951   if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
00952 
00953   ret = CheckTileOwnership(tile);
00954   if (ret.Failed()) return ret;
00955 
00956   {
00957     /* See if this is a valid track combination for signals, (ie, no overlap) */
00958     TrackBits trackbits = GetTrackBits(tile);
00959     if (KillFirstBit(trackbits) != TRACK_BIT_NONE && // More than one track present
00960         trackbits != TRACK_BIT_HORZ &&
00961         trackbits != TRACK_BIT_VERT) {
00962       return_cmd_error(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK);
00963     }
00964   }
00965 
00966   /* In case we don't want to change an existing signal, return without error. */
00967   if (HasBit(p1, 17) && HasSignalOnTrack(tile, track)) return CommandCost();
00968 
00969   /* you can not convert a signal if no signal is on track */
00970   if (convert_signal && !HasSignalOnTrack(tile, track)) return_cmd_error(STR_ERROR_THERE_ARE_NO_SIGNALS);
00971 
00972   CommandCost cost;
00973   if (!HasSignalOnTrack(tile, track)) {
00974     /* build new signals */
00975     cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS]);
00976   } else {
00977     if (p2 != 0 && sigvar != GetSignalVariant(tile, track)) {
00978       /* convert signals <-> semaphores */
00979       cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
00980 
00981     } else if (convert_signal) {
00982       /* convert button pressed */
00983       if (ctrl_pressed || GetSignalVariant(tile, track) != sigvar) {
00984         /* convert electric <-> semaphore */
00985         cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
00986       } else {
00987         /* it is free to change signal type: normal-pre-exit-combo */
00988         cost = CommandCost();
00989       }
00990 
00991     } else {
00992       /* it is free to change orientation/pre-exit-combo signals */
00993       cost = CommandCost();
00994     }
00995   }
00996 
00997   if (flags & DC_EXEC) {
00998     Train *v = NULL;
00999     /* The new/changed signal could block our path. As this can lead to
01000      * stale reservations, we clear the path reservation here and try
01001      * to redo it later on. */
01002     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
01003       v = GetTrainForReservation(tile, track);
01004       if (v != NULL) FreeTrainTrackReservation(v);
01005     }
01006 
01007     if (!HasSignals(tile)) {
01008       /* there are no signals at all on this tile yet */
01009       SetHasSignals(tile, true);
01010       SetSignalStates(tile, 0xF); // all signals are on
01011       SetPresentSignals(tile, 0); // no signals built by default
01012       SetSignalType(tile, track, sigtype);
01013       SetSignalVariant(tile, track, sigvar);
01014     }
01015 
01016     if (p2 == 0) {
01017       if (!HasSignalOnTrack(tile, track)) {
01018         /* build new signals */
01019         SetPresentSignals(tile, GetPresentSignals(tile) | (IsPbsSignal(sigtype) ? KillFirstBit(SignalOnTrack(track)) : SignalOnTrack(track)));
01020         SetSignalType(tile, track, sigtype);
01021         SetSignalVariant(tile, track, sigvar);
01022         while (num_dir_cycle-- > 0) CycleSignalSide(tile, track);
01023       } else {
01024         if (convert_signal) {
01025           /* convert signal button pressed */
01026           if (ctrl_pressed) {
01027             /* toggle the pressent signal variant: SIG_ELECTRIC <-> SIG_SEMAPHORE */
01028             SetSignalVariant(tile, track, (GetSignalVariant(tile, track) == SIG_ELECTRIC) ? SIG_SEMAPHORE : SIG_ELECTRIC);
01029             /* Query current signal type so the check for PBS signals below works. */
01030             sigtype = GetSignalType(tile, track);
01031           } else {
01032             /* convert the present signal to the chosen type and variant */
01033             SetSignalType(tile, track, sigtype);
01034             SetSignalVariant(tile, track, sigvar);
01035             if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
01036               SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
01037             }
01038           }
01039 
01040         } else if (ctrl_pressed) {
01041           /* cycle between cycle_start and cycle_end */
01042           sigtype = (SignalType)(GetSignalType(tile, track) + 1);
01043 
01044           if (sigtype < cycle_start || sigtype > cycle_stop) sigtype = cycle_start;
01045 
01046           SetSignalType(tile, track, sigtype);
01047           if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
01048             SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
01049           }
01050         } else {
01051           /* cycle the signal side: both -> left -> right -> both -> ... */
01052           CycleSignalSide(tile, track);
01053           /* Query current signal type so the check for PBS signals below works. */
01054           sigtype = GetSignalType(tile, track);
01055         }
01056       }
01057     } else {
01058       /* If CmdBuildManySignals is called with copying signals, just copy the
01059        * direction of the first signal given as parameter by CmdBuildManySignals */
01060       SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | (p2 & SignalOnTrack(track)));
01061       SetSignalVariant(tile, track, sigvar);
01062       SetSignalType(tile, track, sigtype);
01063     }
01064 
01065     if (IsPbsSignal(sigtype)) {
01066       /* PBS signals should show red unless they are on a reservation. */
01067       uint mask = GetPresentSignals(tile) & SignalOnTrack(track);
01068       SetSignalStates(tile, (GetSignalStates(tile) & ~mask) | ((HasBit(GetRailReservationTrackBits(tile), track) ? UINT_MAX : 0) & mask));
01069     }
01070     MarkTileDirtyByTile(tile);
01071     AddTrackToSignalBuffer(tile, track, _current_company);
01072     YapfNotifyTrackLayoutChange(tile, track);
01073     if (v != NULL) {
01074       /* Extend the train's path if it's not stopped or loading, or not at a safe position. */
01075       if (!(((v->vehstatus & VS_STOPPED) && v->cur_speed == 0) || v->current_order.IsType(OT_LOADING)) ||
01076           !IsSafeWaitingPosition(v, v->tile, v->GetVehicleTrackdir(), true, _settings_game.pf.forbid_90_deg)) {
01077         TryPathReserve(v, true);
01078       }
01079     }
01080   }
01081 
01082   return cost;
01083 }
01084 
01085 static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
01086 {
01087   tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
01088   if (tile == INVALID_TILE) return false;
01089 
01090   /* Check for track bits on the new tile */
01091   TrackdirBits trackdirbits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
01092 
01093   if (TracksOverlap(TrackdirBitsToTrackBits(trackdirbits))) return false;
01094   trackdirbits &= TrackdirReachesTrackdirs(trackdir);
01095 
01096   /* No track bits, must stop */
01097   if (trackdirbits == TRACKDIR_BIT_NONE) return false;
01098 
01099   /* Get the first track dir */
01100   trackdir = RemoveFirstTrackdir(&trackdirbits);
01101 
01102   /* Any left? It's a junction so we stop */
01103   if (trackdirbits != TRACKDIR_BIT_NONE) return false;
01104 
01105   switch (GetTileType(tile)) {
01106     case MP_RAILWAY:
01107       if (IsRailDepot(tile)) return false;
01108       if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
01109       signal_ctr++;
01110       if (IsDiagonalTrackdir(trackdir)) {
01111         signal_ctr++;
01112         /* Ensure signal_ctr even so X and Y pieces get signals */
01113         ClrBit(signal_ctr, 0);
01114       }
01115       return true;
01116 
01117     case MP_ROAD:
01118       if (!IsLevelCrossing(tile)) return false;
01119       signal_ctr += 2;
01120       return true;
01121 
01122     case MP_TUNNELBRIDGE: {
01123       TileIndex orig_tile = tile; // backup old value
01124 
01125       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
01126       if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
01127 
01128       /* Skip to end of tunnel or bridge
01129        * note that tile is a parameter by reference, so it must be updated */
01130       tile = GetOtherTunnelBridgeEnd(tile);
01131 
01132       signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
01133       return true;
01134     }
01135 
01136     default: return false;
01137   }
01138 }
01139 
01156 static CommandCost CmdSignalTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01157 {
01158   CommandCost total_cost(EXPENSES_CONSTRUCTION);
01159   TileIndex start_tile = tile;
01160 
01161   Track track = Extract<Track, 0, 3>(p2);
01162   bool mode = HasBit(p2, 3);
01163   bool semaphores = HasBit(p2, 4);
01164   bool remove = HasBit(p2, 5);
01165   bool autofill = HasBit(p2, 6);
01166   byte signal_density = GB(p2, 24, 8);
01167 
01168   if (p1 >= MapSize() || !ValParamTrackOrientation(track)) return CMD_ERROR;
01169   TileIndex end_tile = p1;
01170   if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
01171 
01172   if (!IsPlainRailTile(tile)) return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
01173 
01174   /* for vertical/horizontal tracks, double the given signals density
01175    * since the original amount will be too dense (shorter tracks) */
01176   signal_density *= 2;
01177 
01178   Trackdir trackdir = TrackToTrackdir(track);
01179   CommandCost ret = ValidateAutoDrag(&trackdir, tile, end_tile);
01180   if (ret.Failed()) return ret;
01181 
01182   track = TrackdirToTrack(trackdir); // trackdir might have changed, keep track in sync
01183   Trackdir start_trackdir = trackdir;
01184 
01185   /* Must start on a valid track to be able to avoid loops */
01186   if (!HasTrack(tile, track)) return CMD_ERROR;
01187 
01188   SignalType sigtype = (SignalType)GB(p2, 7, 3);
01189   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
01190 
01191   byte signals;
01192   /* copy the signal-style of the first rail-piece if existing */
01193   if (HasSignalOnTrack(tile, track)) {
01194     signals = GetPresentSignals(tile) & SignalOnTrack(track);
01195     assert(signals != 0);
01196 
01197     /* copy signal/semaphores style (independent of CTRL) */
01198     semaphores = GetSignalVariant(tile, track) != SIG_ELECTRIC;
01199 
01200     sigtype = GetSignalType(tile, track);
01201     /* Don't but copy entry or exit-signal type */
01202     if (sigtype == SIGTYPE_ENTRY || sigtype == SIGTYPE_EXIT) sigtype = SIGTYPE_NORMAL;
01203   } else { // no signals exist, drag a two-way signal stretch
01204     signals = IsPbsSignal(sigtype) ? SignalAlongTrackdir(trackdir) : SignalOnTrack(track);
01205   }
01206 
01207   byte signal_dir = 0;
01208   if (signals & SignalAlongTrackdir(trackdir))   SetBit(signal_dir, 0);
01209   if (signals & SignalAgainstTrackdir(trackdir)) SetBit(signal_dir, 1);
01210 
01211   /* signal_ctr         - amount of tiles already processed
01212    * signals_density    - setting to put signal on every Nth tile (double space on |, -- tracks)
01213    **********
01214    * trackdir   - trackdir to build with autorail
01215    * semaphores - semaphores or signals
01216    * signals    - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
01217    *              and convert all others to semaphore/signal
01218    * remove     - 1 remove signals, 0 build signals */
01219   int signal_ctr = 0;
01220   CommandCost last_error = CMD_ERROR;
01221   bool had_success = false;
01222   for (;;) {
01223     /* only build/remove signals with the specified density */
01224     if ((remove && autofill) || signal_ctr % signal_density == 0) {
01225       uint32 p1 = GB(TrackdirToTrack(trackdir), 0, 3);
01226       SB(p1, 3, 1, mode);
01227       SB(p1, 4, 1, semaphores);
01228       SB(p1, 5, 3, sigtype);
01229       if (!remove && signal_ctr == 0) SetBit(p1, 17);
01230 
01231       /* Pick the correct orientation for the track direction */
01232       signals = 0;
01233       if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
01234       if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
01235 
01236       CommandCost ret = DoCommand(tile, p1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
01237 
01238       /* Be user-friendly and try placing signals as much as possible */
01239       if (ret.Succeeded()) {
01240         had_success = true;
01241         total_cost.AddCost(ret);
01242       } else {
01243         /* The "No railway" error is the least important one. */
01244         if (ret.GetErrorMessage() != STR_ERROR_THERE_IS_NO_RAILROAD_TRACK ||
01245             last_error.GetErrorMessage() == INVALID_STRING_ID) {
01246           last_error = ret;
01247         }
01248       }
01249     }
01250 
01251     if (autofill) {
01252       if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
01253 
01254       /* Prevent possible loops */
01255       if (tile == start_tile && trackdir == start_trackdir) break;
01256     } else {
01257       if (tile == end_tile) break;
01258 
01259       tile += ToTileIndexDiff(_trackdelta[trackdir]);
01260       signal_ctr++;
01261 
01262       /* toggle railbit for the non-diagonal tracks (|, -- tracks) */
01263       if (IsDiagonalTrackdir(trackdir)) {
01264         signal_ctr++;
01265       } else {
01266         ToggleBit(trackdir, 0);
01267       }
01268     }
01269   }
01270 
01271   return had_success ? total_cost : last_error;
01272 }
01273 
01292 CommandCost CmdBuildSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01293 {
01294   return CmdSignalTrackHelper(tile, flags, p1, p2, text);
01295 }
01296 
01309 CommandCost CmdRemoveSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01310 {
01311   Track track = Extract<Track, 0, 3>(p1);
01312 
01313   if (!ValParamTrackOrientation(track) || !IsPlainRailTile(tile) || !HasTrack(tile, track)) {
01314     return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
01315   }
01316   if (!HasSignalOnTrack(tile, track)) {
01317     return_cmd_error(STR_ERROR_THERE_ARE_NO_SIGNALS);
01318   }
01319   CommandCost ret = EnsureNoTrainOnTrack(tile, track);
01320   if (ret.Failed()) return ret;
01321 
01322   /* Only water can remove signals from anyone */
01323   if (_current_company != OWNER_WATER) {
01324     CommandCost ret = CheckTileOwnership(tile);
01325     if (ret.Failed()) return ret;
01326   }
01327 
01328   /* Do it? */
01329   if (flags & DC_EXEC) {
01330     Train *v = NULL;
01331     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
01332       v = GetTrainForReservation(tile, track);
01333     } else if (IsPbsSignal(GetSignalType(tile, track))) {
01334       /* PBS signal, might be the end of a path reservation. */
01335       Trackdir td = TrackToTrackdir(track);
01336       for (int i = 0; v == NULL && i < 2; i++, td = ReverseTrackdir(td)) {
01337         /* Only test the active signal side. */
01338         if (!HasSignalOnTrackdir(tile, ReverseTrackdir(td))) continue;
01339         TileIndex next = TileAddByDiagDir(tile, TrackdirToExitdir(td));
01340         TrackBits tracks = TrackdirBitsToTrackBits(TrackdirReachesTrackdirs(td));
01341         if (HasReservedTracks(next, tracks)) {
01342           v = GetTrainForReservation(next, TrackBitsToTrack(GetReservedTrackbits(next) & tracks));
01343         }
01344       }
01345     }
01346     SetPresentSignals(tile, GetPresentSignals(tile) & ~SignalOnTrack(track));
01347 
01348     /* removed last signal from tile? */
01349     if (GetPresentSignals(tile) == 0) {
01350       SetSignalStates(tile, 0);
01351       SetHasSignals(tile, false);
01352       SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
01353     }
01354 
01355     AddTrackToSignalBuffer(tile, track, GetTileOwner(tile));
01356     YapfNotifyTrackLayoutChange(tile, track);
01357     if (v != NULL) TryPathReserve(v, false);
01358 
01359     MarkTileDirtyByTile(tile);
01360   }
01361 
01362   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_SIGNALS]);
01363 }
01364 
01383 CommandCost CmdRemoveSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01384 {
01385   return CmdSignalTrackHelper(tile, flags, p1, SetBit(p2, 5), text); // bit 5 is remove bit
01386 }
01387 
01389 static Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
01390 {
01391   if (v->type != VEH_TRAIN) return NULL;
01392 
01393   TrainList *affected_trains = static_cast<TrainList*>(data);
01394   affected_trains->Include(Train::From(v)->First());
01395 
01396   return NULL;
01397 }
01398 
01409 CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01410 {
01411   RailType totype = Extract<RailType, 0, 4>(p2);
01412 
01413   if (!ValParamRailtype(totype)) return CMD_ERROR;
01414   if (p1 >= MapSize()) return CMD_ERROR;
01415 
01416   TrainList affected_trains;
01417 
01418   CommandCost cost(EXPENSES_CONSTRUCTION);
01419   CommandCost error = CommandCost(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK); // by default, there is no track to convert.
01420   TileArea ta(tile, p1);
01421   TILE_AREA_LOOP(tile, ta) {
01422     TileType tt = GetTileType(tile);
01423 
01424     /* Check if there is any track on tile */
01425     switch (tt) {
01426       case MP_RAILWAY:
01427         break;
01428       case MP_STATION:
01429         if (!HasStationRail(tile)) continue;
01430         break;
01431       case MP_ROAD:
01432         if (!IsLevelCrossing(tile)) continue;
01433         if (RailNoLevelCrossings(totype)) {
01434           error.MakeError(STR_ERROR_CROSSING_DISALLOWED);
01435           continue;
01436         }
01437         break;
01438       case MP_TUNNELBRIDGE:
01439         if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
01440         break;
01441       default: continue;
01442     }
01443 
01444     /* Original railtype we are converting from */
01445     RailType type = GetRailType(tile);
01446 
01447     /* Converting to the same type or converting 'hidden' elrail -> rail */
01448     if (type == totype || (_settings_game.vehicle.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
01449 
01450     /* Trying to convert other's rail */
01451     CommandCost ret = CheckTileOwnership(tile);
01452     if (ret.Failed()) {
01453       error = ret;
01454       continue;
01455     }
01456 
01457     SmallVector<Train *, 2> vehicles_affected;
01458 
01459     /* Vehicle on the tile when not converting Rail <-> ElRail
01460      * Tunnels and bridges have special check later */
01461     if (tt != MP_TUNNELBRIDGE) {
01462       if (!IsCompatibleRail(type, totype)) {
01463         CommandCost ret = EnsureNoVehicleOnGround(tile);
01464         if (ret.Failed()) {
01465           error = ret;
01466           continue;
01467         }
01468       }
01469       if (flags & DC_EXEC) { // we can safely convert, too
01470         TrackBits reserved = GetReservedTrackbits(tile);
01471         Track     track;
01472         while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
01473           Train *v = GetTrainForReservation(tile, track);
01474           if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
01475             /* No power on new rail type, reroute. */
01476             FreeTrainTrackReservation(v);
01477             *vehicles_affected.Append() = v;
01478           }
01479         }
01480 
01481         SetRailType(tile, totype);
01482         MarkTileDirtyByTile(tile);
01483         /* update power of train on this tile */
01484         FindVehicleOnPos(tile, &affected_trains, &UpdateTrainPowerProc);
01485       }
01486     }
01487 
01488     switch (tt) {
01489       case MP_RAILWAY:
01490         switch (GetRailTileType(tile)) {
01491           case RAIL_TILE_DEPOT:
01492             if (flags & DC_EXEC) {
01493               /* notify YAPF about the track layout change */
01494               YapfNotifyTrackLayoutChange(tile, GetRailDepotTrack(tile));
01495 
01496               /* Update build vehicle window related to this depot */
01497               InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
01498               InvalidateWindowData(WC_BUILD_VEHICLE, tile);
01499             }
01500             cost.AddCost(RailConvertCost(type, totype));
01501             break;
01502 
01503           default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
01504             if (flags & DC_EXEC) {
01505               /* notify YAPF about the track layout change */
01506               TrackBits tracks = GetTrackBits(tile);
01507               while (tracks != TRACK_BIT_NONE) {
01508                 YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
01509               }
01510             }
01511             cost.AddCost(RailConvertCost(type, totype) * CountBits(GetTrackBits(tile)));
01512             break;
01513         }
01514         break;
01515 
01516       case MP_TUNNELBRIDGE: {
01517         TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
01518 
01519         /* If both ends of tunnel/bridge are in the range, do not try to convert twice -
01520          * it would cause assert because of different test and exec runs */
01521         if (endtile < tile && TileX(endtile) >= TileX(ta.tile) && TileX(endtile) < TileX(ta.tile) + ta.w &&
01522             TileY(endtile) >= TileY(ta.tile) && TileY(endtile) < TileY(ta.tile) + ta.h) continue;
01523 
01524         /* When not coverting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
01525         if (!IsCompatibleRail(GetRailType(tile), totype)) {
01526           CommandCost ret = TunnelBridgeIsFree(tile, endtile);
01527           if (ret.Failed()) {
01528             error = ret;
01529             continue;
01530           }
01531         }
01532 
01533         if (flags & DC_EXEC) {
01534           Track track = DiagDirToDiagTrack(GetTunnelBridgeDirection(tile));
01535           if (HasTunnelBridgeReservation(tile)) {
01536             Train *v = GetTrainForReservation(tile, track);
01537             if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
01538               /* No power on new rail type, reroute. */
01539               FreeTrainTrackReservation(v);
01540               *vehicles_affected.Append() = v;
01541             }
01542           }
01543           SetRailType(tile, totype);
01544           SetRailType(endtile, totype);
01545 
01546           FindVehicleOnPos(tile, &affected_trains, &UpdateTrainPowerProc);
01547           FindVehicleOnPos(endtile, &affected_trains, &UpdateTrainPowerProc);
01548 
01549           YapfNotifyTrackLayoutChange(tile, track);
01550           YapfNotifyTrackLayoutChange(endtile, track);
01551 
01552           MarkTileDirtyByTile(tile);
01553           MarkTileDirtyByTile(endtile);
01554 
01555           if (IsBridge(tile)) {
01556             TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
01557             TileIndex t = tile + delta;
01558             for (; t != endtile; t += delta) MarkTileDirtyByTile(t); // TODO encapsulate this into a function
01559           }
01560         }
01561 
01562         cost.AddCost((GetTunnelBridgeLength(tile, endtile) + 2) * RailConvertCost(type, totype));
01563         break;
01564       }
01565 
01566       default: // MP_STATION, MP_ROAD
01567         if (flags & DC_EXEC) {
01568           Track track = ((tt == MP_STATION) ? GetRailStationTrack(tile) : GetCrossingRailTrack(tile));
01569           YapfNotifyTrackLayoutChange(tile, track);
01570         }
01571 
01572         cost.AddCost(RailConvertCost(type, totype));
01573         break;
01574     }
01575 
01576     for (uint i = 0; i < vehicles_affected.Length(); ++i) {
01577       TryPathReserve(vehicles_affected[i], true);
01578     }
01579   }
01580 
01581   if (flags & DC_EXEC) {
01582     /* Railtype changed, update trains as when entering different track */
01583     for (Train **v = affected_trains.Begin(); v != affected_trains.End(); v++) {
01584       (*v)->RailtypeChanged();
01585     }
01586   }
01587 
01588   return (cost.GetCost() == 0) ? error : cost;
01589 }
01590 
01591 static CommandCost RemoveTrainDepot(TileIndex tile, DoCommandFlag flags)
01592 {
01593   if (_current_company != OWNER_WATER) {
01594     CommandCost ret = CheckTileOwnership(tile);
01595     if (ret.Failed()) return ret;
01596   }
01597 
01598   CommandCost ret = EnsureNoVehicleOnGround(tile);
01599   if (ret.Failed()) return ret;
01600 
01601   if (flags & DC_EXEC) {
01602     /* read variables before the depot is removed */
01603     DiagDirection dir = GetRailDepotDirection(tile);
01604     Owner owner = GetTileOwner(tile);
01605     Train *v = NULL;
01606 
01607     if (HasDepotReservation(tile)) {
01608       v = GetTrainForReservation(tile, DiagDirToDiagTrack(dir));
01609       if (v != NULL) FreeTrainTrackReservation(v);
01610     }
01611 
01612     delete Depot::GetByTile(tile);
01613     DoClearSquare(tile);
01614     AddSideToSignalBuffer(tile, dir, owner);
01615     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
01616     if (v != NULL) TryPathReserve(v, true);
01617   }
01618 
01619   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_TRAIN]);
01620 }
01621 
01622 static CommandCost ClearTile_Track(TileIndex tile, DoCommandFlag flags)
01623 {
01624   CommandCost cost(EXPENSES_CONSTRUCTION);
01625 
01626   if (flags & DC_AUTO) {
01627     if (!IsTileOwner(tile, _current_company)) {
01628       return_cmd_error(STR_ERROR_AREA_IS_OWNED_BY_ANOTHER);
01629     }
01630 
01631     if (IsPlainRail(tile)) {
01632       return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
01633     } else {
01634       return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
01635     }
01636   }
01637 
01638   switch (GetRailTileType(tile)) {
01639     case RAIL_TILE_SIGNALS:
01640     case RAIL_TILE_NORMAL: {
01641       Slope tileh = GetTileSlope(tile, NULL);
01642       /* Is there flat water on the lower halftile that gets cleared expensively? */
01643       bool water_ground = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh));
01644 
01645       TrackBits tracks = GetTrackBits(tile);
01646       while (tracks != TRACK_BIT_NONE) {
01647         Track track = RemoveFirstTrack(&tracks);
01648         CommandCost ret = DoCommand(tile, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
01649         if (ret.Failed()) return ret;
01650         cost.AddCost(ret);
01651       }
01652 
01653       /* when bankrupting, don't make water dirty, there could be a ship on lower halftile */
01654       if (water_ground && !(flags & DC_BANKRUPT)) {
01655         CommandCost ret = EnsureNoVehicleOnGround(tile);
01656         if (ret.Failed()) return ret;
01657 
01658         /* The track was removed, and left a coast tile. Now also clear the water. */
01659         if (flags & DC_EXEC) DoClearSquare(tile);
01660         cost.AddCost(_price[PR_CLEAR_WATER]);
01661       }
01662 
01663       return cost;
01664     }
01665 
01666     case RAIL_TILE_DEPOT:
01667       return RemoveTrainDepot(tile, flags);
01668 
01669     default:
01670       return CMD_ERROR;
01671   }
01672 }
01673 
01678 static uint GetSaveSlopeZ(uint x, uint y, Track track)
01679 {
01680   switch (track) {
01681     case TRACK_UPPER: x &= ~0xF; y &= ~0xF; break;
01682     case TRACK_LOWER: x |=  0xF; y |=  0xF; break;
01683     case TRACK_LEFT:  x |=  0xF; y &= ~0xF; break;
01684     case TRACK_RIGHT: x &= ~0xF; y |=  0xF; break;
01685     default: break;
01686   }
01687   return GetSlopeZ(x, y);
01688 }
01689 
01690 static void DrawSingleSignal(TileIndex tile, Track track, byte condition, uint image, uint pos)
01691 {
01692   bool side = (_settings_game.vehicle.road_side != 0) && _settings_game.construction.signal_side;
01693   static const Point SignalPositions[2][12] = {
01694     { // Signals on the left side
01695     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
01696       { 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
01697     /*  LOWER     LOWER     X         X         Y         Y     */
01698       {11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
01699     }, { // Signals on the right side
01700     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
01701       {14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
01702     /*  LOWER     LOWER     X         X         Y         Y     */
01703       {14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
01704     }
01705   };
01706 
01707   uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
01708   uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
01709 
01710   SpriteID sprite;
01711 
01712   SignalType type       = GetSignalType(tile, track);
01713   SignalVariant variant = GetSignalVariant(tile, track);
01714 
01715   if (type == SIGTYPE_NORMAL && variant == SIG_ELECTRIC) {
01716     /* Normal electric signals are picked from original sprites. */
01717     sprite = SPR_ORIGINAL_SIGNALS_BASE + image + condition;
01718   } else {
01719     /* All other signals are picked from add on sprites. */
01720     sprite = SPR_SIGNALS_BASE + (type - 1) * 16 + variant * 64 + image + condition + (type > SIGTYPE_LAST_NOPBS ? 64 : 0);
01721   }
01722 
01723   AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, GetSaveSlopeZ(x, y, track));
01724 }
01725 
01726 static uint32 _drawtile_track_palette;
01727 
01728 
01729 static void DrawTrackFence_NW(const TileInfo *ti, SpriteID base_image)
01730 {
01731   RailFenceOffset rfo = RFO_FLAT_X;
01732   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
01733   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01734     ti->x, ti->y + 1, 16, 1, 4, ti->z);
01735 }
01736 
01737 static void DrawTrackFence_SE(const TileInfo *ti, SpriteID base_image)
01738 {
01739   RailFenceOffset rfo = RFO_FLAT_X;
01740   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
01741   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01742     ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
01743 }
01744 
01745 static void DrawTrackFence_NW_SE(const TileInfo *ti, SpriteID base_image)
01746 {
01747   DrawTrackFence_NW(ti, base_image);
01748   DrawTrackFence_SE(ti, base_image);
01749 }
01750 
01751 static void DrawTrackFence_NE(const TileInfo *ti, SpriteID base_image)
01752 {
01753   RailFenceOffset rfo = RFO_FLAT_Y;
01754   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
01755   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01756     ti->x + 1, ti->y, 1, 16, 4, ti->z);
01757 }
01758 
01759 static void DrawTrackFence_SW(const TileInfo *ti, SpriteID base_image)
01760 {
01761   RailFenceOffset rfo = RFO_FLAT_Y;
01762   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
01763   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01764     ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
01765 }
01766 
01767 static void DrawTrackFence_NE_SW(const TileInfo *ti, SpriteID base_image)
01768 {
01769   DrawTrackFence_NE(ti, base_image);
01770   DrawTrackFence_SW(ti, base_image);
01771 }
01772 
01776 static void DrawTrackFence_NS_1(const TileInfo *ti, SpriteID base_image)
01777 {
01778   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_W);
01779   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
01780     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01781 }
01782 
01786 static void DrawTrackFence_NS_2(const TileInfo *ti, SpriteID base_image)
01787 {
01788   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_E);
01789   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
01790     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01791 }
01792 
01796 static void DrawTrackFence_WE_1(const TileInfo *ti, SpriteID base_image)
01797 {
01798   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_N);
01799   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
01800     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01801 }
01802 
01806 static void DrawTrackFence_WE_2(const TileInfo *ti, SpriteID base_image)
01807 {
01808   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_S);
01809   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
01810     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01811 }
01812 
01813 
01814 static void DrawTrackDetails(const TileInfo *ti, const RailtypeInfo *rti)
01815 {
01816   /* Base sprite for track fences.
01817    * Note: Halftile slopes only have fences on the upper part. */
01818   SpriteID base_image = GetCustomRailSprite(rti, ti->tile, RTSG_FENCES, IsHalftileSlope(ti->tileh) ? TCX_UPPER_HALFTILE : TCX_NORMAL);
01819   if (base_image == 0) base_image = SPR_TRACK_FENCE_FLAT_X;
01820 
01821   switch (GetRailGroundType(ti->tile)) {
01822     case RAIL_GROUND_FENCE_NW:     DrawTrackFence_NW(ti, base_image);    break;
01823     case RAIL_GROUND_FENCE_SE:     DrawTrackFence_SE(ti, base_image);    break;
01824     case RAIL_GROUND_FENCE_SENW:   DrawTrackFence_NW_SE(ti, base_image); break;
01825     case RAIL_GROUND_FENCE_NE:     DrawTrackFence_NE(ti, base_image);    break;
01826     case RAIL_GROUND_FENCE_SW:     DrawTrackFence_SW(ti, base_image);    break;
01827     case RAIL_GROUND_FENCE_NESW:   DrawTrackFence_NE_SW(ti, base_image); break;
01828     case RAIL_GROUND_FENCE_VERT1:  DrawTrackFence_NS_1(ti, base_image);  break;
01829     case RAIL_GROUND_FENCE_VERT2:  DrawTrackFence_NS_2(ti, base_image);  break;
01830     case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti, base_image);  break;
01831     case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti, base_image);  break;
01832     case RAIL_GROUND_WATER: {
01833       Corner track_corner;
01834       if (IsHalftileSlope(ti->tileh)) {
01835         /* Steep slope or one-corner-raised slope with halftile foundation */
01836         track_corner = GetHalftileSlopeCorner(ti->tileh);
01837       } else {
01838         /* Three-corner-raised slope */
01839         track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
01840       }
01841       switch (track_corner) {
01842         case CORNER_W: DrawTrackFence_NS_1(ti, base_image); break;
01843         case CORNER_S: DrawTrackFence_WE_2(ti, base_image); break;
01844         case CORNER_E: DrawTrackFence_NS_2(ti, base_image); break;
01845         case CORNER_N: DrawTrackFence_WE_1(ti, base_image); break;
01846         default: NOT_REACHED();
01847       }
01848       break;
01849     }
01850     default: break;
01851   }
01852 }
01853 
01854 /* SubSprite for drawing the track halftile of 'three-corners-raised'-sloped rail sprites. */
01855 static const int INF = 1000; // big number compared to tilesprite size
01856 static const SubSprite _halftile_sub_sprite[4] = {
01857   { -INF    , -INF  , 32 - 33, INF     }, // CORNER_W, clip 33 pixels from right
01858   { -INF    ,  0 + 7, INF    , INF     }, // CORNER_S, clip 7 pixels from top
01859   { -31 + 33, -INF  , INF    , INF     }, // CORNER_E, clip 33 pixels from left
01860   { -INF    , -INF  , INF    , 30 - 23 }  // CORNER_N, clip 23 pixels from bottom
01861 };
01862 
01863 static inline void DrawTrackSprite(SpriteID sprite, PaletteID pal, const TileInfo *ti, Slope s)
01864 {
01865   DrawGroundSprite(sprite, pal, NULL, 0, (ti->tileh & s) ? -8 : 0);
01866 }
01867 
01868 static void DrawTrackBitsOverlay(TileInfo *ti, TrackBits track, const RailtypeInfo *rti)
01869 {
01870   RailGroundType rgt = GetRailGroundType(ti->tile);
01871   Foundation f = GetRailFoundation(ti->tileh, track);
01872   Corner halftile_corner = CORNER_INVALID;
01873 
01874   if (IsNonContinuousFoundation(f)) {
01875     /* Save halftile corner */
01876     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
01877     /* Draw lower part first */
01878     track &= ~CornerToTrackBits(halftile_corner);
01879     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
01880   }
01881 
01882   DrawFoundation(ti, f);
01883   /* DrawFoundation modifies ti */
01884 
01885   /* Draw ground */
01886   if (rgt == RAIL_GROUND_WATER) {
01887     if (track != TRACK_BIT_NONE || IsSteepSlope(ti->tileh)) {
01888       /* three-corner-raised slope or steep slope with track on upper part */
01889       DrawShoreTile(ti->tileh);
01890     } else {
01891       /* single-corner-raised slope with track on upper part */
01892       DrawGroundSprite(SPR_FLAT_WATER_TILE, PAL_NONE);
01893     }
01894   } else {
01895     SpriteID image;
01896 
01897     switch (rgt) {
01898       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
01899       case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
01900       default:                     image = SPR_FLAT_GRASS_TILE; break;
01901     }
01902 
01903     image += SlopeToSpriteOffset(ti->tileh);
01904 
01905     DrawGroundSprite(image, PAL_NONE);
01906   }
01907 
01908   SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
01909   SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
01910   TrackBits pbs = _settings_client.gui.show_track_reservation ? GetRailReservationTrackBits(ti->tile) : TRACK_BIT_NONE;
01911 
01912   if (track == TRACK_BIT_NONE) {
01913     /* Half-tile foundation, no track here? */
01914   } else if (ti->tileh == SLOPE_NW && track == TRACK_BIT_Y) {
01915     DrawGroundSprite(ground + RTO_SLOPE_NW, PAL_NONE);
01916     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 9, PALETTE_CRASH);
01917   } else if (ti->tileh == SLOPE_NE && track == TRACK_BIT_X) {
01918     DrawGroundSprite(ground + RTO_SLOPE_NE, PAL_NONE);
01919     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 6, PALETTE_CRASH);
01920   } else if (ti->tileh == SLOPE_SE && track == TRACK_BIT_Y) {
01921     DrawGroundSprite(ground + RTO_SLOPE_SE, PAL_NONE);
01922     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 7, PALETTE_CRASH);
01923   } else if (ti->tileh == SLOPE_SW && track == TRACK_BIT_X) {
01924     DrawGroundSprite(ground + RTO_SLOPE_SW, PAL_NONE);
01925     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 8, PALETTE_CRASH);
01926   } else {
01927     switch (track) {
01928       /* Draw single ground sprite when not overlapping. No track overlay
01929        * is necessary for these sprites. */
01930       case TRACK_BIT_X:     DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
01931       case TRACK_BIT_Y:     DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
01932       case TRACK_BIT_UPPER: DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N); break;
01933       case TRACK_BIT_LOWER: DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
01934       case TRACK_BIT_RIGHT: DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E); break;
01935       case TRACK_BIT_LEFT:  DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
01936       case TRACK_BIT_CROSS: DrawGroundSprite(ground + RTO_CROSSING_XY, PAL_NONE); break;
01937       case TRACK_BIT_HORZ:  DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N);
01938                             DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
01939       case TRACK_BIT_VERT:  DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E);
01940                             DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
01941 
01942       default:
01943         /* We're drawing a junction tile */
01944         if ((track & TRACK_BIT_3WAY_NE) == 0) {
01945           DrawGroundSprite(ground + RTO_JUNCTION_SW, PAL_NONE);
01946         } else if ((track & TRACK_BIT_3WAY_SW) == 0) {
01947           DrawGroundSprite(ground + RTO_JUNCTION_NE, PAL_NONE);
01948         } else if ((track & TRACK_BIT_3WAY_NW) == 0) {
01949           DrawGroundSprite(ground + RTO_JUNCTION_SE, PAL_NONE);
01950         } else if ((track & TRACK_BIT_3WAY_SE) == 0) {
01951           DrawGroundSprite(ground + RTO_JUNCTION_NW, PAL_NONE);
01952         } else {
01953           DrawGroundSprite(ground + RTO_JUNCTION_NSEW, PAL_NONE);
01954         }
01955 
01956         /* Mask out PBS bits as we shall draw them afterwards anyway. */
01957         track &= ~pbs;
01958 
01959         /* Draw regular track bits */
01960         if (track & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PAL_NONE);
01961         if (track & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PAL_NONE);
01962         if (track & TRACK_BIT_UPPER) DrawGroundSprite(overlay + RTO_N, PAL_NONE);
01963         if (track & TRACK_BIT_LOWER) DrawGroundSprite(overlay + RTO_S, PAL_NONE);
01964         if (track & TRACK_BIT_RIGHT) DrawGroundSprite(overlay + RTO_E, PAL_NONE);
01965         if (track & TRACK_BIT_LEFT)  DrawGroundSprite(overlay + RTO_W, PAL_NONE);
01966     }
01967 
01968     /* Draw reserved track bits */
01969     if (pbs & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH);
01970     if (pbs & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH);
01971     if (pbs & TRACK_BIT_UPPER) DrawTrackSprite(overlay + RTO_N, PALETTE_CRASH, ti, SLOPE_N);
01972     if (pbs & TRACK_BIT_LOWER) DrawTrackSprite(overlay + RTO_S, PALETTE_CRASH, ti, SLOPE_S);
01973     if (pbs & TRACK_BIT_RIGHT) DrawTrackSprite(overlay + RTO_E, PALETTE_CRASH, ti, SLOPE_E);
01974     if (pbs & TRACK_BIT_LEFT)  DrawTrackSprite(overlay + RTO_W, PALETTE_CRASH, ti, SLOPE_W);
01975   }
01976 
01977   if (IsValidCorner(halftile_corner)) {
01978     DrawFoundation(ti, HalftileFoundation(halftile_corner));
01979     overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY, TCX_UPPER_HALFTILE);
01980     ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND, TCX_UPPER_HALFTILE);
01981 
01982     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
01983     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
01984 
01985     SpriteID image;
01986     switch (rgt) {
01987       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
01988       case RAIL_GROUND_ICE_DESERT:
01989       case RAIL_GROUND_HALF_SNOW:  image = SPR_FLAT_SNOW_DESERT_TILE; break;
01990       default:                     image = SPR_FLAT_GRASS_TILE; break;
01991     }
01992 
01993     image += SlopeToSpriteOffset(fake_slope);
01994 
01995     DrawGroundSprite(image, PAL_NONE, &(_halftile_sub_sprite[halftile_corner]));
01996 
01997     track = CornerToTrackBits(halftile_corner);
01998 
01999     int offset;
02000     switch (track) {
02001       default: NOT_REACHED();
02002       case TRACK_BIT_UPPER: offset = RTO_N; break;
02003       case TRACK_BIT_LOWER: offset = RTO_S; break;
02004       case TRACK_BIT_RIGHT: offset = RTO_E; break;
02005       case TRACK_BIT_LEFT:  offset = RTO_W; break;
02006     }
02007 
02008     DrawTrackSprite(ground + offset, PAL_NONE, ti, fake_slope);
02009     if (_settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, track)) {
02010       DrawTrackSprite(overlay + offset, PALETTE_CRASH, ti, fake_slope);
02011     }
02012   }
02013 }
02014 
02020 static void DrawTrackBits(TileInfo *ti, TrackBits track)
02021 {
02022   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
02023 
02024   if (rti->UsesOverlay()) {
02025     DrawTrackBitsOverlay(ti, track, rti);
02026     return;
02027   }
02028 
02029   RailGroundType rgt = GetRailGroundType(ti->tile);
02030   Foundation f = GetRailFoundation(ti->tileh, track);
02031   Corner halftile_corner = CORNER_INVALID;
02032 
02033   if (IsNonContinuousFoundation(f)) {
02034     /* Save halftile corner */
02035     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
02036     /* Draw lower part first */
02037     track &= ~CornerToTrackBits(halftile_corner);
02038     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
02039   }
02040 
02041   DrawFoundation(ti, f);
02042   /* DrawFoundation modifies ti */
02043 
02044   SpriteID image;
02045   PaletteID pal = PAL_NONE;
02046   const SubSprite *sub = NULL;
02047   bool junction = false;
02048 
02049   /* Select the sprite to use. */
02050   if (track == 0) {
02051     /* Clear ground (only track on halftile foundation) */
02052     if (rgt == RAIL_GROUND_WATER) {
02053       if (IsSteepSlope(ti->tileh)) {
02054         DrawShoreTile(ti->tileh);
02055         image = 0;
02056       } else {
02057         image = SPR_FLAT_WATER_TILE;
02058       }
02059     } else {
02060       switch (rgt) {
02061         case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
02062         case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
02063         default:                     image = SPR_FLAT_GRASS_TILE; break;
02064       }
02065       image += SlopeToSpriteOffset(ti->tileh);
02066     }
02067   } else {
02068     if (ti->tileh != SLOPE_FLAT) {
02069       /* track on non-flat ground */
02070       image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
02071     } else {
02072       /* track on flat ground */
02073       (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
02074       (image++,                           track == TRACK_BIT_X) ||
02075       (image++,                           track == TRACK_BIT_UPPER) ||
02076       (image++,                           track == TRACK_BIT_LOWER) ||
02077       (image++,                           track == TRACK_BIT_RIGHT) ||
02078       (image++,                           track == TRACK_BIT_LEFT) ||
02079       (image++,                           track == TRACK_BIT_CROSS) ||
02080 
02081       (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
02082       (image++,                            track == TRACK_BIT_VERT) ||
02083 
02084       (junction = true, false) ||
02085       (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
02086       (image++,                          (track & TRACK_BIT_3WAY_SW) == 0) ||
02087       (image++,                          (track & TRACK_BIT_3WAY_NW) == 0) ||
02088       (image++,                          (track & TRACK_BIT_3WAY_SE) == 0) ||
02089       (image++, true);
02090     }
02091 
02092     switch (rgt) {
02093       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
02094       case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset;  break;
02095       case RAIL_GROUND_WATER: {
02096         /* three-corner-raised slope */
02097         DrawShoreTile(ti->tileh);
02098         Corner track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
02099         sub = &(_halftile_sub_sprite[track_corner]);
02100         break;
02101       }
02102       default: break;
02103     }
02104   }
02105 
02106   if (image != 0) DrawGroundSprite(image, pal, sub);
02107 
02108   /* Draw track pieces individually for junction tiles */
02109   if (junction) {
02110     if (track & TRACK_BIT_X)     DrawGroundSprite(rti->base_sprites.single_x, PAL_NONE);
02111     if (track & TRACK_BIT_Y)     DrawGroundSprite(rti->base_sprites.single_y, PAL_NONE);
02112     if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PAL_NONE);
02113     if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PAL_NONE);
02114     if (track & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PAL_NONE);
02115     if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PAL_NONE);
02116   }
02117 
02118   /* PBS debugging, draw reserved tracks darker */
02119   if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation) {
02120     /* Get reservation, but mask track on halftile slope */
02121     TrackBits pbs = GetRailReservationTrackBits(ti->tile) & track;
02122     if (pbs & TRACK_BIT_X) {
02123       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
02124         DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH);
02125       } else {
02126         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
02127       }
02128     }
02129     if (pbs & TRACK_BIT_Y) {
02130       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
02131         DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH);
02132       } else {
02133         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
02134       }
02135     }
02136     if (pbs & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_N ? -(int)TILE_HEIGHT : 0);
02137     if (pbs & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_S ? -(int)TILE_HEIGHT : 0);
02138     if (pbs & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_W ? -(int)TILE_HEIGHT : 0);
02139     if (pbs & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_E ? -(int)TILE_HEIGHT : 0);
02140   }
02141 
02142   if (IsValidCorner(halftile_corner)) {
02143     DrawFoundation(ti, HalftileFoundation(halftile_corner));
02144 
02145     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
02146     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
02147     image = _track_sloped_sprites[fake_slope - 1] + rti->base_sprites.track_y;
02148     pal = PAL_NONE;
02149     switch (rgt) {
02150       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
02151       case RAIL_GROUND_ICE_DESERT:
02152       case RAIL_GROUND_HALF_SNOW:  image += rti->snow_offset;  break; // higher part has snow in this case too
02153       default: break;
02154     }
02155     DrawGroundSprite(image, pal, &(_halftile_sub_sprite[halftile_corner]));
02156 
02157     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, CornerToTrackBits(halftile_corner))) {
02158       static const byte _corner_to_track_sprite[] = {3, 1, 2, 0};
02159       DrawGroundSprite(_corner_to_track_sprite[halftile_corner] + rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, -(int)TILE_HEIGHT);
02160     }
02161   }
02162 }
02163 
02171 enum SignalOffsets {
02172   SIGNAL_TO_SOUTHWEST =  0,
02173   SIGNAL_TO_NORTHEAST =  2,
02174   SIGNAL_TO_SOUTHEAST =  4,
02175   SIGNAL_TO_NORTHWEST =  6,
02176   SIGNAL_TO_EAST      =  8,
02177   SIGNAL_TO_WEST      = 10,
02178   SIGNAL_TO_SOUTH     = 12,
02179   SIGNAL_TO_NORTH     = 14,
02180 };
02181 
02182 static void DrawSignals(TileIndex tile, TrackBits rails)
02183 {
02184 #define MAYBE_DRAW_SIGNAL(x, y, z, t) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, t, GetSingleSignalState(tile, x), y, z)
02185 
02186   if (!(rails & TRACK_BIT_Y)) {
02187     if (!(rails & TRACK_BIT_X)) {
02188       if (rails & TRACK_BIT_LEFT) {
02189         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTH, 0, TRACK_LEFT);
02190         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTH, 1, TRACK_LEFT);
02191       }
02192       if (rails & TRACK_BIT_RIGHT) {
02193         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_NORTH, 2, TRACK_RIGHT);
02194         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_SOUTH, 3, TRACK_RIGHT);
02195       }
02196       if (rails & TRACK_BIT_UPPER) {
02197         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_WEST, 4, TRACK_UPPER);
02198         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_EAST, 5, TRACK_UPPER);
02199       }
02200       if (rails & TRACK_BIT_LOWER) {
02201         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_WEST, 6, TRACK_LOWER);
02202         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_EAST, 7, TRACK_LOWER);
02203       }
02204     } else {
02205       MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHWEST, 8, TRACK_X);
02206       MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHEAST, 9, TRACK_X);
02207     }
02208   } else {
02209     MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHEAST, 10, TRACK_Y);
02210     MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHWEST, 11, TRACK_Y);
02211   }
02212 }
02213 
02214 static void DrawTile_Track(TileInfo *ti)
02215 {
02216   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
02217 
02218   _drawtile_track_palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
02219 
02220   if (IsPlainRail(ti->tile)) {
02221     TrackBits rails = GetTrackBits(ti->tile);
02222 
02223     DrawTrackBits(ti, rails);
02224 
02225     if (HasBit(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti, rti);
02226 
02227     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
02228 
02229     if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
02230   } else {
02231     /* draw depot */
02232     const DrawTileSprites *dts;
02233     PaletteID pal = PAL_NONE;
02234     SpriteID relocation;
02235 
02236     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
02237 
02238     if (IsInvisibilitySet(TO_BUILDINGS)) {
02239       /* Draw rail instead of depot */
02240       dts = &_depot_invisible_gfx_table[GetRailDepotDirection(ti->tile)];
02241     } else {
02242       dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
02243     }
02244 
02245     SpriteID image;
02246     if (rti->UsesOverlay()) {
02247       image = SPR_FLAT_GRASS_TILE;
02248     } else {
02249       image = dts->ground.sprite;
02250       if (image != SPR_FLAT_GRASS_TILE) image += rti->GetRailtypeSpriteOffset();
02251     }
02252 
02253     /* adjust ground tile for desert
02254      * don't adjust for snow, because snow in depots looks weird */
02255     if (IsSnowRailGround(ti->tile) && _settings_game.game_creation.landscape == LT_TROPIC) {
02256       if (image != SPR_FLAT_GRASS_TILE) {
02257         image += rti->snow_offset; // tile with tracks
02258       } else {
02259         image = SPR_FLAT_SNOW_DESERT_TILE; // flat ground
02260       }
02261     }
02262 
02263     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, _drawtile_track_palette));
02264 
02265     if (rti->UsesOverlay()) {
02266       SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
02267 
02268       switch (GetRailDepotDirection(ti->tile)) {
02269         case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02270         case DIAGDIR_SW: DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
02271         case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02272         case DIAGDIR_SE: DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
02273         default: break;
02274       }
02275 
02276       if (_settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
02277         SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
02278 
02279         switch (GetRailDepotDirection(ti->tile)) {
02280           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02281           case DIAGDIR_SW: DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH); break;
02282           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02283           case DIAGDIR_SE: DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH); break;
02284           default: break;
02285         }
02286       }
02287 
02288       int depot_sprite = GetCustomRailSprite(rti, ti->tile, RTSG_DEPOT);
02289       relocation = depot_sprite != 0 ? depot_sprite - SPR_RAIL_DEPOT_SE_1 : rti->GetRailtypeSpriteOffset();
02290     } else {
02291       /* PBS debugging, draw reserved tracks darker */
02292       if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
02293         switch (GetRailDepotDirection(ti->tile)) {
02294           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02295           case DIAGDIR_SW: DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH); break;
02296           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02297           case DIAGDIR_SE: DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH); break;
02298           default: break;
02299         }
02300       }
02301 
02302       relocation = rti->GetRailtypeSpriteOffset();
02303     }
02304 
02305     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
02306 
02307     DrawRailTileSeq(ti, dts, TO_BUILDINGS, relocation, 0, _drawtile_track_palette);
02308   }
02309   DrawBridgeMiddle(ti);
02310 }
02311 
02312 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
02313 {
02314   const DrawTileSprites *dts = &_depot_gfx_table[dir];
02315   const RailtypeInfo *rti = GetRailTypeInfo(railtype);
02316   SpriteID image = rti->UsesOverlay() ? SPR_FLAT_GRASS_TILE : dts->ground.sprite;
02317   uint32 offset = rti->GetRailtypeSpriteOffset();
02318 
02319   x += 33;
02320   y += 17;
02321 
02322   if (image != SPR_FLAT_GRASS_TILE) image += offset;
02323   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
02324 
02325   DrawSprite(image, PAL_NONE, x, y);
02326 
02327   if (rti->UsesOverlay()) {
02328     SpriteID ground = GetCustomRailSprite(rti, INVALID_TILE, RTSG_GROUND);
02329 
02330     switch (dir) {
02331       case DIAGDIR_SW: DrawSprite(ground + RTO_X, PAL_NONE, x, y); break;
02332       case DIAGDIR_SE: DrawSprite(ground + RTO_Y, PAL_NONE, x, y); break;
02333       default: break;
02334     }
02335 
02336     int depot_sprite = GetCustomRailSprite(rti, INVALID_TILE, RTSG_DEPOT);
02337     if (depot_sprite != 0) offset = depot_sprite - SPR_RAIL_DEPOT_SE_1;
02338   }
02339 
02340   DrawRailTileSeqInGUI(x, y, dts, offset, 0, palette);
02341 }
02342 
02343 static uint GetSlopeZ_Track(TileIndex tile, uint x, uint y)
02344 {
02345   uint z;
02346   Slope tileh = GetTileSlope(tile, &z);
02347 
02348   if (tileh == SLOPE_FLAT) return z;
02349   if (IsPlainRail(tile)) {
02350     z += ApplyFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
02351     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
02352   } else {
02353     return z + TILE_HEIGHT;
02354   }
02355 }
02356 
02357 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
02358 {
02359   return IsPlainRail(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
02360 }
02361 
02362 static void TileLoop_Track(TileIndex tile)
02363 {
02364   RailGroundType old_ground = GetRailGroundType(tile);
02365   RailGroundType new_ground;
02366 
02367   if (old_ground == RAIL_GROUND_WATER) {
02368     TileLoop_Water(tile);
02369     return;
02370   }
02371 
02372   switch (_settings_game.game_creation.landscape) {
02373     case LT_ARCTIC: {
02374       uint z;
02375       Slope slope = GetTileSlope(tile, &z);
02376       bool half = false;
02377 
02378       /* for non-flat track, use lower part of track
02379        * in other cases, use the highest part with track */
02380       if (IsPlainRail(tile)) {
02381         TrackBits track = GetTrackBits(tile);
02382         Foundation f = GetRailFoundation(slope, track);
02383 
02384         switch (f) {
02385           case FOUNDATION_NONE:
02386             /* no foundation - is the track on the upper side of three corners raised tile? */
02387             if (IsSlopeWithThreeCornersRaised(slope)) z += TILE_HEIGHT;
02388             break;
02389 
02390           case FOUNDATION_INCLINED_X:
02391           case FOUNDATION_INCLINED_Y:
02392             /* sloped track - is it on a steep slope? */
02393             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
02394             break;
02395 
02396           case FOUNDATION_STEEP_LOWER:
02397             /* only lower part of steep slope */
02398             z += TILE_HEIGHT;
02399             break;
02400 
02401           default:
02402             /* if it is a steep slope, then there is a track on higher part */
02403             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
02404             z += TILE_HEIGHT;
02405             break;
02406         }
02407 
02408         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
02409       } else {
02410         /* is the depot on a non-flat tile? */
02411         if (slope != SLOPE_FLAT) z += TILE_HEIGHT;
02412       }
02413 
02414       /* 'z' is now the lowest part of the highest track bit -
02415        * for sloped track, it is 'z' of lower part
02416        * for two track bits, it is 'z' of higher track bit
02417        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
02418       if (z > GetSnowLine()) {
02419         if (half && z - GetSnowLine() == TILE_HEIGHT) {
02420           /* track on non-continuous foundation, lower part is not under snow */
02421           new_ground = RAIL_GROUND_HALF_SNOW;
02422         } else {
02423           new_ground = RAIL_GROUND_ICE_DESERT;
02424         }
02425         goto set_ground;
02426       }
02427       break;
02428       }
02429 
02430     case LT_TROPIC:
02431       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
02432         new_ground = RAIL_GROUND_ICE_DESERT;
02433         goto set_ground;
02434       }
02435       break;
02436   }
02437 
02438   new_ground = RAIL_GROUND_GRASS;
02439 
02440   if (IsPlainRail(tile) && old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
02441     /* determine direction of fence */
02442     TrackBits rail = GetTrackBits(tile);
02443 
02444     switch (rail) {
02445       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
02446       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
02447       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
02448       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
02449 
02450       default: {
02451         Owner owner = GetTileOwner(tile);
02452 
02453         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
02454               (rail & TRACK_BIT_3WAY_NW) == 0 &&
02455               (rail & TRACK_BIT_X)
02456             )) {
02457           TileIndex n = tile + TileDiffXY(0, -1);
02458           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02459 
02460           if (!IsTileType(n, MP_RAILWAY) ||
02461               !IsTileOwner(n, owner) ||
02462               nrail == TRACK_BIT_UPPER ||
02463               nrail == TRACK_BIT_LEFT) {
02464             new_ground = RAIL_GROUND_FENCE_NW;
02465           }
02466         }
02467 
02468         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
02469               (rail & TRACK_BIT_3WAY_SE) == 0 &&
02470               (rail & TRACK_BIT_X)
02471             )) {
02472           TileIndex n = tile + TileDiffXY(0, 1);
02473           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02474 
02475           if (!IsTileType(n, MP_RAILWAY) ||
02476               !IsTileOwner(n, owner) ||
02477               nrail == TRACK_BIT_LOWER ||
02478               nrail == TRACK_BIT_RIGHT) {
02479             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
02480               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
02481           }
02482         }
02483 
02484         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
02485               (rail & TRACK_BIT_3WAY_NE) == 0 &&
02486               (rail & TRACK_BIT_Y)
02487             )) {
02488           TileIndex n = tile + TileDiffXY(-1, 0);
02489           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02490 
02491           if (!IsTileType(n, MP_RAILWAY) ||
02492               !IsTileOwner(n, owner) ||
02493               nrail == TRACK_BIT_UPPER ||
02494               nrail == TRACK_BIT_RIGHT) {
02495             new_ground = RAIL_GROUND_FENCE_NE;
02496           }
02497         }
02498 
02499         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
02500               (rail & TRACK_BIT_3WAY_SW) == 0 &&
02501               (rail & TRACK_BIT_Y)
02502             )) {
02503           TileIndex n = tile + TileDiffXY(1, 0);
02504           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02505 
02506           if (!IsTileType(n, MP_RAILWAY) ||
02507               !IsTileOwner(n, owner) ||
02508               nrail == TRACK_BIT_LOWER ||
02509               nrail == TRACK_BIT_LEFT) {
02510             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
02511               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
02512           }
02513         }
02514         break;
02515       }
02516     }
02517   }
02518 
02519 set_ground:
02520   if (old_ground != new_ground) {
02521     SetRailGroundType(tile, new_ground);
02522     MarkTileDirtyByTile(tile);
02523   }
02524 }
02525 
02526 
02527 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
02528 {
02529   /* Case of half tile slope with water. */
02530   if (mode == TRANSPORT_WATER && IsPlainRail(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
02531     TrackBits tb = GetTrackBits(tile);
02532     switch (tb) {
02533       default: NOT_REACHED();
02534       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
02535       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
02536       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
02537       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
02538     }
02539     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
02540   }
02541 
02542   if (mode != TRANSPORT_RAIL) return 0;
02543 
02544   TrackBits trackbits = TRACK_BIT_NONE;
02545   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
02546 
02547   switch (GetRailTileType(tile)) {
02548     default: NOT_REACHED();
02549     case RAIL_TILE_NORMAL:
02550       trackbits = GetTrackBits(tile);
02551       break;
02552 
02553     case RAIL_TILE_SIGNALS: {
02554       trackbits = GetTrackBits(tile);
02555       byte a = GetPresentSignals(tile);
02556       uint b = GetSignalStates(tile);
02557 
02558       b &= a;
02559 
02560       /* When signals are not present (in neither direction),
02561        * we pretend them to be green. Otherwise, it depends on
02562        * the signal type. For signals that are only active from
02563        * one side, we set the missing signals explicitely to
02564        * `green'. Otherwise, they implicitely become `red'. */
02565       if (!IsOnewaySignal(tile, TRACK_UPPER) || (a & SignalOnTrack(TRACK_UPPER)) == 0) b |= ~a & SignalOnTrack(TRACK_UPPER);
02566       if (!IsOnewaySignal(tile, TRACK_LOWER) || (a & SignalOnTrack(TRACK_LOWER)) == 0) b |= ~a & SignalOnTrack(TRACK_LOWER);
02567 
02568       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
02569       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
02570       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
02571       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
02572 
02573       break;
02574     }
02575 
02576     case RAIL_TILE_DEPOT: {
02577       DiagDirection dir = GetRailDepotDirection(tile);
02578 
02579       if (side != INVALID_DIAGDIR && side != dir) break;
02580 
02581       trackbits = DiagDirToDiagTrackBits(dir);
02582       break;
02583     }
02584   }
02585 
02586   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
02587 }
02588 
02589 static bool ClickTile_Track(TileIndex tile)
02590 {
02591   if (!IsRailDepot(tile)) return false;
02592 
02593   ShowDepotWindow(tile, VEH_TRAIN);
02594   return true;
02595 }
02596 
02597 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
02598 {
02599   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
02600   td->rail_speed = rti->max_speed;
02601   td->owner[0] = GetTileOwner(tile);
02602   switch (GetRailTileType(tile)) {
02603     case RAIL_TILE_NORMAL:
02604       td->str = STR_LAI_RAIL_DESCRIPTION_TRACK;
02605       break;
02606 
02607     case RAIL_TILE_SIGNALS: {
02608       static const StringID signal_type[6][6] = {
02609         {
02610           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_SIGNALS,
02611           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
02612           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
02613           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
02614           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
02615           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS
02616         },
02617         {
02618           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
02619           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRESIGNALS,
02620           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
02621           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
02622           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
02623           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS
02624         },
02625         {
02626           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
02627           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
02628           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXITSIGNALS,
02629           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
02630           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
02631           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS
02632         },
02633         {
02634           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
02635           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
02636           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
02637           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBOSIGNALS,
02638           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
02639           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS
02640         },
02641         {
02642           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
02643           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
02644           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
02645           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
02646           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBSSIGNALS,
02647           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS
02648         },
02649         {
02650           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS,
02651           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS,
02652           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS,
02653           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS,
02654           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS,
02655           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NOENTRYSIGNALS
02656         }
02657       };
02658 
02659       SignalType primary_signal;
02660       SignalType secondary_signal;
02661       if (HasSignalOnTrack(tile, TRACK_UPPER)) {
02662         primary_signal = GetSignalType(tile, TRACK_UPPER);
02663         secondary_signal = HasSignalOnTrack(tile, TRACK_LOWER) ? GetSignalType(tile, TRACK_LOWER) : primary_signal;
02664       } else {
02665         secondary_signal = primary_signal = GetSignalType(tile, TRACK_LOWER);
02666       }
02667 
02668       td->str = signal_type[secondary_signal][primary_signal];
02669       break;
02670     }
02671 
02672     case RAIL_TILE_DEPOT:
02673       td->str = STR_LAI_RAIL_DESCRIPTION_TRAIN_DEPOT;
02674       if (_settings_game.vehicle.train_acceleration_model != AM_ORIGINAL) {
02675         if (td->rail_speed > 0) {
02676           td->rail_speed = min(td->rail_speed, 61);
02677         } else {
02678           td->rail_speed = 61;
02679         }
02680       }
02681       td->build_date = Depot::GetByTile(tile)->build_date;
02682       break;
02683 
02684     default:
02685       NOT_REACHED();
02686   }
02687 }
02688 
02689 static void ChangeTileOwner_Track(TileIndex tile, Owner old_owner, Owner new_owner)
02690 {
02691   if (!IsTileOwner(tile, old_owner)) return;
02692 
02693   if (new_owner != INVALID_OWNER) {
02694     SetTileOwner(tile, new_owner);
02695   } else {
02696     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
02697   }
02698 }
02699 
02700 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
02701 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
02702 static const int8 _deltacoord_leaveoffset[8] = {
02703   -1,  0,  1,  0, /* x */
02704    0,  1,  0, -1  /* y */
02705 };
02706 
02707 
02714 int TicksToLeaveDepot(const Train *v)
02715 {
02716   DiagDirection dir = GetRailDepotDirection(v->tile);
02717   int length = v->gcache.cached_veh_length;
02718 
02719   switch (dir) {
02720     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
02721     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
02722     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
02723     default:
02724     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
02725   }
02726 
02727   return 0; // make compilers happy
02728 }
02729 
02734 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *u, TileIndex tile, int x, int y)
02735 {
02736   /* this routine applies only to trains in depot tiles */
02737   if (u->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
02738 
02739   Train *v = Train::From(u);
02740 
02741   /* depot direction */
02742   DiagDirection dir = GetRailDepotDirection(tile);
02743 
02744   /* calculate the point where the following wagon should be activated
02745    * this depends on the length of the current vehicle */
02746   int length = v->gcache.cached_veh_length;
02747 
02748   byte fract_coord_leave =
02749     ((_fractcoords_enter[dir] & 0x0F) + // x
02750       (length + 1) * _deltacoord_leaveoffset[dir]) +
02751     (((_fractcoords_enter[dir] >> 4) +  // y
02752       ((length + 1) * _deltacoord_leaveoffset[dir + 4])) << 4);
02753 
02754   byte fract_coord = (x & 0xF) + ((y & 0xF) << 4);
02755 
02756   if (_fractcoords_behind[dir] == fract_coord) {
02757     /* make sure a train is not entering the tile from behind */
02758     return VETSB_CANNOT_ENTER;
02759   } else if (_fractcoords_enter[dir] == fract_coord) {
02760     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
02761       /* enter the depot */
02762       v->track = TRACK_BIT_DEPOT,
02763       v->vehstatus |= VS_HIDDEN; // hide it
02764       v->direction = ReverseDir(v->direction);
02765       if (v->Next() == NULL) VehicleEnterDepot(v->First());
02766       v->tile = tile;
02767 
02768       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
02769       return VETSB_ENTERED_WORMHOLE;
02770     }
02771   } else if (fract_coord_leave == fract_coord) {
02772     if (DiagDirToDir(dir) == v->direction) {
02773       /* leave the depot? */
02774       if ((v = v->Next()) != NULL) {
02775         v->vehstatus &= ~VS_HIDDEN;
02776         v->track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
02777       }
02778     }
02779   }
02780 
02781   return VETSB_CONTINUE;
02782 }
02783 
02795 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, uint z_old, Slope tileh_old, uint z_new, Slope tileh_new, TrackBits rail_bits)
02796 {
02797   if (!_settings_game.construction.build_on_slopes || !AutoslopeEnabled()) return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
02798 
02799   /* Is the slope-rail_bits combination valid in general? I.e. is it safe to call GetRailFoundation() ? */
02800   if (CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile).Failed()) return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
02801 
02802   /* Get the slopes on top of the foundations */
02803   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
02804   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
02805 
02806   Corner track_corner;
02807   switch (rail_bits) {
02808     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
02809     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
02810     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
02811     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
02812 
02813     /* Surface slope must not be changed */
02814     default:
02815       if (z_old != z_new || tileh_old != tileh_new) return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
02816       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
02817   }
02818 
02819   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
02820   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
02821   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
02822   if (z_old != z_new) return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
02823 
02824   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
02825   /* Make the ground dirty, if surface slope has changed */
02826   if (tileh_old != tileh_new) {
02827     /* If there is flat water on the lower halftile add the cost for clearing it */
02828     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price[PR_CLEAR_WATER]);
02829     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
02830   }
02831   return  cost;
02832 }
02833 
02834 static CommandCost TerraformTile_Track(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
02835 {
02836   uint z_old;
02837   Slope tileh_old = GetTileSlope(tile, &z_old);
02838   if (IsPlainRail(tile)) {
02839     TrackBits rail_bits = GetTrackBits(tile);
02840     /* Is there flat water on the lower halftile that must be cleared expensively? */
02841     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
02842 
02843     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
02844     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
02845 
02846     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
02847     Corner allowed_corner;
02848     switch (rail_bits) {
02849       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
02850       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
02851       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
02852       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
02853       default: return autoslope_result;
02854     }
02855 
02856     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
02857 
02858     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
02859     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
02860 
02861     /* Everything is valid, which only changes allowed_corner */
02862     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
02863       if (allowed_corner == corner) continue;
02864       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
02865     }
02866 
02867     /* Make the ground dirty */
02868     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
02869 
02870     /* allow terraforming */
02871     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price[PR_CLEAR_WATER] : (Money)0);
02872   } else if (_settings_game.construction.build_on_slopes && AutoslopeEnabled() &&
02873       AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) {
02874     return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
02875   }
02876   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
02877 }
02878 
02879 
02880 extern const TileTypeProcs _tile_type_rail_procs = {
02881   DrawTile_Track,           // draw_tile_proc
02882   GetSlopeZ_Track,          // get_slope_z_proc
02883   ClearTile_Track,          // clear_tile_proc
02884   NULL,                     // add_accepted_cargo_proc
02885   GetTileDesc_Track,        // get_tile_desc_proc
02886   GetTileTrackStatus_Track, // get_tile_track_status_proc
02887   ClickTile_Track,          // click_tile_proc
02888   NULL,                     // animate_tile_proc
02889   TileLoop_Track,           // tile_loop_clear
02890   ChangeTileOwner_Track,    // change_tile_owner_clear
02891   NULL,                     // add_produced_cargo_proc
02892   VehicleEnter_Track,       // vehicle_enter_tile_proc
02893   GetFoundation_Track,      // get_foundation_proc
02894   TerraformTile_Track,      // terraform_tile_proc
02895 };

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