rail_cmd.cpp

Go to the documentation of this file.
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 "vehicle_func.h"
00025 #include "sound_func.h"
00026 #include "tunnelbridge.h"
00027 #include "elrail_func.h"
00028 #include "town.h"
00029 #include "pbs.h"
00030 #include "company_base.h"
00031 #include "core/backup_type.hpp"
00032 #include "date_func.h"
00033 #include "strings_func.h"
00034 #include "company_gui.h"
00035 
00036 #include "table/strings.h"
00037 #include "table/railtypes.h"
00038 #include "table/track_land.h"
00039 
00041 typedef SmallVector<Train *, 16> TrainList;
00042 
00043 RailtypeInfo _railtypes[RAILTYPE_END];
00044 
00045 assert_compile(sizeof(_original_railtypes) <= sizeof(_railtypes));
00046 
00050 void ResetRailTypes()
00051 {
00052   memset(_railtypes, 0, sizeof(_railtypes));
00053   memcpy(_railtypes, _original_railtypes, sizeof(_original_railtypes));
00054 }
00055 
00056 void ResolveRailTypeGUISprites(RailtypeInfo *rti)
00057 {
00058   SpriteID cursors_base = GetCustomRailSprite(rti, INVALID_TILE, RTSG_CURSORS);
00059   if (cursors_base != 0) {
00060     rti->gui_sprites.build_ns_rail = cursors_base +  0;
00061     rti->gui_sprites.build_x_rail  = cursors_base +  1;
00062     rti->gui_sprites.build_ew_rail = cursors_base +  2;
00063     rti->gui_sprites.build_y_rail  = cursors_base +  3;
00064     rti->gui_sprites.auto_rail     = cursors_base +  4;
00065     rti->gui_sprites.build_depot   = cursors_base +  5;
00066     rti->gui_sprites.build_tunnel  = cursors_base +  6;
00067     rti->gui_sprites.convert_rail  = cursors_base +  7;
00068     rti->cursor.rail_ns   = cursors_base +  8;
00069     rti->cursor.rail_swne = cursors_base +  9;
00070     rti->cursor.rail_ew   = cursors_base + 10;
00071     rti->cursor.rail_nwse = cursors_base + 11;
00072     rti->cursor.autorail  = cursors_base + 12;
00073     rti->cursor.depot     = cursors_base + 13;
00074     rti->cursor.tunnel    = cursors_base + 14;
00075     rti->cursor.convert   = cursors_base + 15;
00076   }
00077 }
00078 
00082 void InitRailTypes()
00083 {
00084   for (RailType rt = RAILTYPE_BEGIN; rt != RAILTYPE_END; rt++) {
00085     RailtypeInfo *rti = &_railtypes[rt];
00086     ResolveRailTypeGUISprites(rti);
00087   }
00088 }
00089 
00093 RailType AllocateRailType(RailTypeLabel label)
00094 {
00095   for (RailType rt = RAILTYPE_BEGIN; rt != RAILTYPE_END; rt++) {
00096     RailtypeInfo *rti = &_railtypes[rt];
00097 
00098     if (rti->label == 0) {
00099       /* Set up new rail type */
00100       memcpy(rti, &_railtypes[RAILTYPE_RAIL], sizeof(*rti));
00101       rti->label = label;
00102 
00103       /* Make us compatible with ourself. */
00104       rti->powered_railtypes    = (RailTypes)(1 << rt);
00105       rti->compatible_railtypes = (RailTypes)(1 << rt);
00106 
00107       /* We also introduce ourself. */
00108       rti->introduces_railtypes = (RailTypes)(1 << rt);
00109 
00110       /* Default sort order; order of allocation, but with some
00111        * offsets so it's easier for NewGRF to pick a spot without
00112        * changing the order of other (original) rail types.
00113        * The << is so you can place other railtypes in between the
00114        * other railtypes, the 7 is to be able to place something
00115        * before the first (default) rail type. */
00116       rti->sorting_order = rt << 4 | 7;
00117       return rt;
00118     }
00119   }
00120 
00121   return INVALID_RAILTYPE;
00122 }
00123 
00124 static const byte _track_sloped_sprites[14] = {
00125   14, 15, 22, 13,
00126    0, 21, 17, 12,
00127   23,  0, 18, 20,
00128   19, 16
00129 };
00130 
00131 
00132 /*         4
00133  *     ---------
00134  *    |\       /|
00135  *    | \    1/ |
00136  *    |  \   /  |
00137  *    |   \ /   |
00138  *  16|    \    |32
00139  *    |   / \2  |
00140  *    |  /   \  |
00141  *    | /     \ |
00142  *    |/       \|
00143  *     ---------
00144  *         8
00145  */
00146 
00147 
00148 
00149 /* MAP2 byte:    abcd???? => Signal On? Same coding as map3lo
00150  * MAP3LO byte:  abcd???? => Signal Exists?
00151  *               a and b are for diagonals, upper and left,
00152  *               one for each direction. (ie a == NE->SW, b ==
00153  *               SW->NE, or v.v., I don't know. b and c are
00154  *               similar for lower and right.
00155  * MAP2 byte:    ????abcd => Type of ground.
00156  * MAP3LO byte:  ????abcd => Type of rail.
00157  * MAP5:         00abcdef => rail
00158  *               01abcdef => rail w/ signals
00159  *               10uuuuuu => unused
00160  *               11uuuudd => rail depot
00161  */
00162 
00171 static CommandCost EnsureNoTrainOnTrack(TileIndex tile, Track track)
00172 {
00173   TrackBits rail_bits = TrackToTrackBits(track);
00174   return EnsureNoTrainOnTrackBits(tile, rail_bits);
00175 }
00176 
00184 static CommandCost CheckTrackCombination(TileIndex tile, TrackBits to_build, uint flags)
00185 {
00186   if (!IsPlainRail(tile)) return_cmd_error(STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION);
00187 
00188   /* So, we have a tile with tracks on it (and possibly signals). Let's see
00189    * what tracks first */
00190   TrackBits current = GetTrackBits(tile); // The current track layout.
00191   TrackBits future = current | to_build;  // The track layout we want to build.
00192 
00193   /* Are we really building something new? */
00194   if (current == future) {
00195     /* Nothing new is being built */
00196     return_cmd_error(STR_ERROR_ALREADY_BUILT);
00197   }
00198 
00199   /* Let's see if we may build this */
00200   if ((flags & DC_NO_RAIL_OVERLAP) || HasSignals(tile)) {
00201     /* If we are not allowed to overlap (flag is on for ai companies or we have
00202      * signals on the tile), check that */
00203     if (future != TRACK_BIT_HORZ && future != TRACK_BIT_VERT) {
00204       return_cmd_error((flags & DC_NO_RAIL_OVERLAP) ? STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION : STR_ERROR_MUST_REMOVE_SIGNALS_FIRST);
00205     }
00206   }
00207   /* Normally, we may overlap and any combination is valid */
00208   return CommandCost();
00209 }
00210 
00211 
00213 static const TrackBits _valid_tracks_without_foundation[15] = {
00214   TRACK_BIT_ALL,
00215   TRACK_BIT_RIGHT,
00216   TRACK_BIT_UPPER,
00217   TRACK_BIT_X,
00218 
00219   TRACK_BIT_LEFT,
00220   TRACK_BIT_NONE,
00221   TRACK_BIT_Y,
00222   TRACK_BIT_LOWER,
00223 
00224   TRACK_BIT_LOWER,
00225   TRACK_BIT_Y,
00226   TRACK_BIT_NONE,
00227   TRACK_BIT_LEFT,
00228 
00229   TRACK_BIT_X,
00230   TRACK_BIT_UPPER,
00231   TRACK_BIT_RIGHT,
00232 };
00233 
00235 static const TrackBits _valid_tracks_on_leveled_foundation[15] = {
00236   TRACK_BIT_NONE,
00237   TRACK_BIT_LEFT,
00238   TRACK_BIT_LOWER,
00239   TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,
00240 
00241   TRACK_BIT_RIGHT,
00242   TRACK_BIT_ALL,
00243   TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,
00244   TRACK_BIT_ALL,
00245 
00246   TRACK_BIT_UPPER,
00247   TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,
00248   TRACK_BIT_ALL,
00249   TRACK_BIT_ALL,
00250 
00251   TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,
00252   TRACK_BIT_ALL,
00253   TRACK_BIT_ALL
00254 };
00255 
00263 Foundation GetRailFoundation(Slope tileh, TrackBits bits)
00264 {
00265   if (bits == TRACK_BIT_NONE) return FOUNDATION_NONE;
00266 
00267   if (IsSteepSlope(tileh)) {
00268     /* Test for inclined foundations */
00269     if (bits == TRACK_BIT_X) return FOUNDATION_INCLINED_X;
00270     if (bits == TRACK_BIT_Y) return FOUNDATION_INCLINED_Y;
00271 
00272     /* Get higher track */
00273     Corner highest_corner = GetHighestSlopeCorner(tileh);
00274     TrackBits higher_track = CornerToTrackBits(highest_corner);
00275 
00276     /* Only higher track? */
00277     if (bits == higher_track) return HalftileFoundation(highest_corner);
00278 
00279     /* Overlap with higher track? */
00280     if (TracksOverlap(bits | higher_track)) return FOUNDATION_INVALID;
00281 
00282     /* either lower track or both higher and lower track */
00283     return ((bits & higher_track) != 0 ? FOUNDATION_STEEP_BOTH : FOUNDATION_STEEP_LOWER);
00284   } else {
00285     if ((~_valid_tracks_without_foundation[tileh] & bits) == 0) return FOUNDATION_NONE;
00286 
00287     bool valid_on_leveled = ((~_valid_tracks_on_leveled_foundation[tileh] & bits) == 0);
00288 
00289     Corner track_corner;
00290     switch (bits) {
00291       case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
00292       case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
00293       case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
00294       case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
00295 
00296       case TRACK_BIT_HORZ:
00297         if (tileh == SLOPE_N) return HalftileFoundation(CORNER_N);
00298         if (tileh == SLOPE_S) return HalftileFoundation(CORNER_S);
00299         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00300 
00301       case TRACK_BIT_VERT:
00302         if (tileh == SLOPE_W) return HalftileFoundation(CORNER_W);
00303         if (tileh == SLOPE_E) return HalftileFoundation(CORNER_E);
00304         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00305 
00306       case TRACK_BIT_X:
00307         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_X;
00308         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00309 
00310       case TRACK_BIT_Y:
00311         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_Y;
00312         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00313 
00314       default:
00315         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00316     }
00317     /* Single diagonal track */
00318 
00319     /* Track must be at least valid on leveled foundation */
00320     if (!valid_on_leveled) return FOUNDATION_INVALID;
00321 
00322     /* If slope has three raised corners, build leveled foundation */
00323     if (IsSlopeWithThreeCornersRaised(tileh)) return FOUNDATION_LEVELED;
00324 
00325     /* If neighboured corners of track_corner are lowered, build halftile foundation */
00326     if ((tileh & SlopeWithThreeCornersRaised(OppositeCorner(track_corner))) == SlopeWithOneCornerRaised(track_corner)) return HalftileFoundation(track_corner);
00327 
00328     /* else special anti-zig-zag foundation */
00329     return SpecialRailFoundation(track_corner);
00330   }
00331 }
00332 
00333 
00343 static CommandCost CheckRailSlope(Slope tileh, TrackBits rail_bits, TrackBits existing, TileIndex tile)
00344 {
00345   /* don't allow building on the lower side of a coast */
00346   if (GetFloodingBehaviour(tile) != FLOOD_NONE) {
00347     if (!IsSteepSlope(tileh) && ((~_valid_tracks_on_leveled_foundation[tileh] & (rail_bits | existing)) != 0)) return_cmd_error(STR_ERROR_CAN_T_BUILD_ON_WATER);
00348   }
00349 
00350   Foundation f_new = GetRailFoundation(tileh, rail_bits | existing);
00351 
00352   /* check track/slope combination */
00353   if ((f_new == FOUNDATION_INVALID) ||
00354       ((f_new != FOUNDATION_NONE) && (!_settings_game.construction.build_on_slopes))) {
00355     return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00356   }
00357 
00358   Foundation f_old = GetRailFoundation(tileh, existing);
00359   return CommandCost(EXPENSES_CONSTRUCTION, f_new != f_old ? _price[PR_BUILD_FOUNDATION] : (Money)0);
00360 }
00361 
00362 /* Validate functions for rail building */
00363 static inline bool ValParamTrackOrientation(Track track)
00364 {
00365   return IsValidTrack(track);
00366 }
00367 
00377 CommandCost CmdBuildSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00378 {
00379   RailType railtype = Extract<RailType, 0, 4>(p1);
00380   Track track = Extract<Track, 0, 3>(p2);
00381   CommandCost cost(EXPENSES_CONSTRUCTION);
00382 
00383   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
00384 
00385   Slope tileh = GetTileSlope(tile);
00386   TrackBits trackbit = TrackToTrackBits(track);
00387 
00388   switch (GetTileType(tile)) {
00389     case MP_RAILWAY: {
00390       CommandCost ret = CheckTileOwnership(tile);
00391       if (ret.Failed()) return ret;
00392 
00393       if (!IsPlainRail(tile)) return CMD_ERROR;
00394 
00395       if (!IsCompatibleRail(GetRailType(tile), railtype)) return_cmd_error(STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION);
00396 
00397       ret = CheckTrackCombination(tile, trackbit, flags);
00398       if (ret.Succeeded()) ret = EnsureNoTrainOnTrack(tile, track);
00399       if (ret.Failed()) return ret;
00400 
00401       ret = CheckRailSlope(tileh, trackbit, GetTrackBits(tile), tile);
00402       if (ret.Failed()) return ret;
00403       cost.AddCost(ret);
00404 
00405       /* If the rail types don't match, try to convert only if engines of
00406        * the new rail type are not powered on the present rail type and engines of
00407        * the present rail type are powered on the new rail type. */
00408       if (GetRailType(tile) != railtype && !HasPowerOnRail(railtype, GetRailType(tile))) {
00409         if (HasPowerOnRail(GetRailType(tile), railtype)) {
00410           ret = DoCommand(tile, tile, railtype, flags, CMD_CONVERT_RAIL);
00411           if (ret.Failed()) return ret;
00412           cost.AddCost(ret);
00413         } else {
00414           return CMD_ERROR;
00415         }
00416       }
00417 
00418       if (flags & DC_EXEC) {
00419         SetRailGroundType(tile, RAIL_GROUND_BARREN);
00420         TrackBits bits = GetTrackBits(tile);
00421         SetTrackBits(tile, bits | trackbit);
00422         /* Subtract old infrastructure count. */
00423         uint pieces = CountBits(bits);
00424         if (TracksOverlap(bits)) pieces *= pieces;
00425         Company::Get(GetTileOwner(tile))->infrastructure.rail[GetRailType(tile)] -= pieces;
00426         /* Add new infrastructure count. */
00427         pieces = CountBits(bits | trackbit);
00428         if (TracksOverlap(bits | trackbit)) pieces *= pieces;
00429         Company::Get(GetTileOwner(tile))->infrastructure.rail[GetRailType(tile)] += pieces;
00430         DirtyCompanyInfrastructureWindows(GetTileOwner(tile));
00431       }
00432       break;
00433     }
00434 
00435     case MP_ROAD: {
00436       /* Level crossings may only be built on these slopes */
00437       if (!HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh)) return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00438 
00439       CommandCost ret = EnsureNoVehicleOnGround(tile);
00440       if (ret.Failed()) return ret;
00441 
00442       if (IsNormalRoad(tile)) {
00443         if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00444 
00445         if (GetDisallowedRoadDirections(tile) != DRD_NONE) return_cmd_error(STR_ERROR_CROSSING_ON_ONEWAY_ROAD);
00446 
00447         if (RailNoLevelCrossings(railtype)) return_cmd_error(STR_ERROR_CROSSING_DISALLOWED);
00448 
00449         RoadTypes roadtypes = GetRoadTypes(tile);
00450         RoadBits road = GetRoadBits(tile, ROADTYPE_ROAD);
00451         RoadBits tram = GetRoadBits(tile, ROADTYPE_TRAM);
00452         switch (roadtypes) {
00453           default: break;
00454           case ROADTYPES_TRAM:
00455             /* Tram crossings must always have road. */
00456             if (flags & DC_EXEC) {
00457               SetRoadOwner(tile, ROADTYPE_ROAD, _current_company);
00458               Company *c = Company::GetIfValid(_current_company);
00459               if (c != NULL) {
00460                 /* A full diagonal tile has two road bits. */
00461                 c->infrastructure.road[ROADTYPE_ROAD] += 2;
00462                 DirtyCompanyInfrastructureWindows(c->index);
00463               }
00464             }
00465             roadtypes |= ROADTYPES_ROAD;
00466             break;
00467 
00468           case ROADTYPES_ALL:
00469             if (road != tram) return CMD_ERROR;
00470             break;
00471         }
00472 
00473         road |= tram;
00474 
00475         if ((track == TRACK_X && road == ROAD_Y) ||
00476             (track == TRACK_Y && road == ROAD_X)) {
00477           if (flags & DC_EXEC) {
00478             MakeRoadCrossing(tile, GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), _current_company, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, roadtypes, GetTownIndex(tile));
00479             UpdateLevelCrossing(tile, false);
00480             Company::Get(_current_company)->infrastructure.rail[railtype] += LEVELCROSSING_TRACKBIT_FACTOR;
00481             DirtyCompanyInfrastructureWindows(_current_company);
00482           }
00483           break;
00484         }
00485       }
00486 
00487       if (IsLevelCrossing(tile) && GetCrossingRailBits(tile) == trackbit) {
00488         return_cmd_error(STR_ERROR_ALREADY_BUILT);
00489       }
00490       /* FALL THROUGH */
00491     }
00492 
00493     default: {
00494       /* Will there be flat water on the lower halftile? */
00495       bool water_ground = IsTileType(tile, MP_WATER) && IsSlopeWithOneCornerRaised(tileh);
00496 
00497       CommandCost ret = CheckRailSlope(tileh, trackbit, TRACK_BIT_NONE, tile);
00498       if (ret.Failed()) return ret;
00499       cost.AddCost(ret);
00500 
00501       ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00502       if (ret.Failed()) return ret;
00503       cost.AddCost(ret);
00504 
00505       if (water_ground) {
00506         cost.AddCost(-_price[PR_CLEAR_WATER]);
00507         cost.AddCost(_price[PR_CLEAR_ROUGH]);
00508       }
00509 
00510       if (flags & DC_EXEC) {
00511         MakeRailNormal(tile, _current_company, trackbit, railtype);
00512         if (water_ground) SetRailGroundType(tile, RAIL_GROUND_WATER);
00513         Company::Get(_current_company)->infrastructure.rail[railtype]++;
00514         DirtyCompanyInfrastructureWindows(_current_company);
00515       }
00516       break;
00517     }
00518   }
00519 
00520   if (flags & DC_EXEC) {
00521     MarkTileDirtyByTile(tile);
00522     AddTrackToSignalBuffer(tile, track, _current_company);
00523     YapfNotifyTrackLayoutChange(tile, track);
00524   }
00525 
00526   cost.AddCost(RailBuildCost(railtype));
00527   return cost;
00528 }
00529 
00539 CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00540 {
00541   Track track = Extract<Track, 0, 3>(p2);
00542   CommandCost cost(EXPENSES_CONSTRUCTION);
00543   bool crossing = false;
00544 
00545   if (!ValParamTrackOrientation(track)) return CMD_ERROR;
00546   TrackBits trackbit = TrackToTrackBits(track);
00547 
00548   /* Need to read tile owner now because it may change when the rail is removed
00549    * Also, in case of floods, _current_company != owner
00550    * There may be invalid tiletype even in exec run (when removing long track),
00551    * so do not call GetTileOwner(tile) in any case here */
00552   Owner owner = INVALID_OWNER;
00553 
00554   Train *v = NULL;
00555 
00556   switch (GetTileType(tile)) {
00557     case MP_ROAD: {
00558       if (!IsLevelCrossing(tile) || GetCrossingRailBits(tile) != trackbit) return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
00559 
00560       if (_current_company != OWNER_WATER) {
00561         CommandCost ret = CheckTileOwnership(tile);
00562         if (ret.Failed()) return ret;
00563       }
00564 
00565       if (!(flags & DC_BANKRUPT)) {
00566         CommandCost ret = EnsureNoVehicleOnGround(tile);
00567         if (ret.Failed()) return ret;
00568       }
00569 
00570       cost.AddCost(RailClearCost(GetRailType(tile)));
00571 
00572       if (flags & DC_EXEC) {
00573         if (HasReservedTracks(tile, trackbit)) {
00574           v = GetTrainForReservation(tile, track);
00575           if (v != NULL) FreeTrainTrackReservation(v);
00576         }
00577         owner = GetTileOwner(tile);
00578         Company::Get(owner)->infrastructure.rail[GetRailType(tile)] -= LEVELCROSSING_TRACKBIT_FACTOR;
00579         DirtyCompanyInfrastructureWindows(owner);
00580         MakeRoadNormal(tile, GetCrossingRoadBits(tile), GetRoadTypes(tile), GetTownIndex(tile), GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM));
00581         DeleteNewGRFInspectWindow(GSF_RAILTYPES, tile);
00582       }
00583       break;
00584     }
00585 
00586     case MP_RAILWAY: {
00587       TrackBits present;
00588       /* There are no rails present at depots. */
00589       if (!IsPlainRail(tile)) return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
00590 
00591       if (_current_company != OWNER_WATER) {
00592         CommandCost ret = CheckTileOwnership(tile);
00593         if (ret.Failed()) return ret;
00594       }
00595 
00596       CommandCost ret = EnsureNoTrainOnTrack(tile, track);
00597       if (ret.Failed()) return ret;
00598 
00599       present = GetTrackBits(tile);
00600       if ((present & trackbit) == 0) return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
00601       if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
00602 
00603       cost.AddCost(RailClearCost(GetRailType(tile)));
00604 
00605       /* Charge extra to remove signals on the track, if they are there */
00606       if (HasSignalOnTrack(tile, track)) {
00607         cost.AddCost(DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS));
00608       }
00609 
00610       if (flags & DC_EXEC) {
00611         if (HasReservedTracks(tile, trackbit)) {
00612           v = GetTrainForReservation(tile, track);
00613           if (v != NULL) FreeTrainTrackReservation(v);
00614         }
00615 
00616         owner = GetTileOwner(tile);
00617 
00618         /* Subtract old infrastructure count. */
00619         uint pieces = CountBits(present);
00620         if (TracksOverlap(present)) pieces *= pieces;
00621         Company::Get(owner)->infrastructure.rail[GetRailType(tile)] -= pieces;
00622         /* Add new infrastructure count. */
00623         present ^= trackbit;
00624         pieces = CountBits(present);
00625         if (TracksOverlap(present)) pieces *= pieces;
00626         Company::Get(owner)->infrastructure.rail[GetRailType(tile)] += pieces;
00627         DirtyCompanyInfrastructureWindows(owner);
00628 
00629         if (present == 0) {
00630           Slope tileh = GetTileSlope(tile);
00631           /* If there is flat water on the lower halftile, convert the tile to shore so the water remains */
00632           if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh)) {
00633             MakeShore(tile);
00634           } else {
00635             DoClearSquare(tile);
00636           }
00637           DeleteNewGRFInspectWindow(GSF_RAILTYPES, tile);
00638         } else {
00639           SetTrackBits(tile, present);
00640           SetTrackReservation(tile, GetRailReservationTrackBits(tile) & present);
00641         }
00642       }
00643       break;
00644     }
00645 
00646     default: return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
00647   }
00648 
00649   if (flags & DC_EXEC) {
00650     /* if we got that far, 'owner' variable is set correctly */
00651     assert(Company::IsValidID(owner));
00652 
00653     MarkTileDirtyByTile(tile);
00654     if (crossing) {
00655       /* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we
00656        * are removing one of these pieces, we'll need to update signals for
00657        * both directions explicitly, as after the track is removed it won't
00658        * 'connect' with the other piece. */
00659       AddTrackToSignalBuffer(tile, TRACK_X, owner);
00660       AddTrackToSignalBuffer(tile, TRACK_Y, owner);
00661       YapfNotifyTrackLayoutChange(tile, TRACK_X);
00662       YapfNotifyTrackLayoutChange(tile, TRACK_Y);
00663     } else {
00664       AddTrackToSignalBuffer(tile, track, owner);
00665       YapfNotifyTrackLayoutChange(tile, track);
00666     }
00667 
00668     if (v != NULL) TryPathReserve(v, true);
00669   }
00670 
00671   return cost;
00672 }
00673 
00674 
00682 bool FloodHalftile(TileIndex t)
00683 {
00684   assert(IsPlainRailTile(t));
00685 
00686   bool flooded = false;
00687   if (GetRailGroundType(t) == RAIL_GROUND_WATER) return flooded;
00688 
00689   Slope tileh = GetTileSlope(t);
00690   TrackBits rail_bits = GetTrackBits(t);
00691 
00692   if (IsSlopeWithOneCornerRaised(tileh)) {
00693     TrackBits lower_track = CornerToTrackBits(OppositeCorner(GetHighestSlopeCorner(tileh)));
00694 
00695     TrackBits to_remove = lower_track & rail_bits;
00696     if (to_remove != 0) {
00697       Backup<CompanyByte> cur_company(_current_company, OWNER_WATER, FILE_LINE);
00698       flooded = DoCommand(t, 0, FIND_FIRST_BIT(to_remove), DC_EXEC, CMD_REMOVE_SINGLE_RAIL).Succeeded();
00699       cur_company.Restore();
00700       if (!flooded) return flooded; // not yet floodable
00701       rail_bits = rail_bits & ~to_remove;
00702       if (rail_bits == 0) {
00703         MakeShore(t);
00704         MarkTileDirtyByTile(t);
00705         return flooded;
00706       }
00707     }
00708 
00709     if (IsNonContinuousFoundation(GetRailFoundation(tileh, rail_bits))) {
00710       flooded = true;
00711       SetRailGroundType(t, RAIL_GROUND_WATER);
00712       MarkTileDirtyByTile(t);
00713     }
00714   } else {
00715     /* Make shore on steep slopes and 'three-corners-raised'-slopes. */
00716     if (ApplyFoundationToSlope(GetRailFoundation(tileh, rail_bits), &tileh) == 0) {
00717       if (IsSteepSlope(tileh) || IsSlopeWithThreeCornersRaised(tileh)) {
00718         flooded = true;
00719         SetRailGroundType(t, RAIL_GROUND_WATER);
00720         MarkTileDirtyByTile(t);
00721       }
00722     }
00723   }
00724   return flooded;
00725 }
00726 
00727 static const TileIndexDiffC _trackdelta[] = {
00728   { -1,  0 }, {  0,  1 }, { -1,  0 }, {  0,  1 }, {  1,  0 }, {  0,  1 },
00729   {  0,  0 },
00730   {  0,  0 },
00731   {  1,  0 }, {  0, -1 }, {  0, -1 }, {  1,  0 }, {  0, -1 }, { -1,  0 },
00732   {  0,  0 },
00733   {  0,  0 }
00734 };
00735 
00736 
00737 static CommandCost ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)
00738 {
00739   int x = TileX(start);
00740   int y = TileY(start);
00741   int ex = TileX(end);
00742   int ey = TileY(end);
00743 
00744   if (!ValParamTrackOrientation(TrackdirToTrack(*trackdir))) return CMD_ERROR;
00745 
00746   /* calculate delta x,y from start to end tile */
00747   int dx = ex - x;
00748   int dy = ey - y;
00749 
00750   /* calculate delta x,y for the first direction */
00751   int trdx = _trackdelta[*trackdir].x;
00752   int trdy = _trackdelta[*trackdir].y;
00753 
00754   if (!IsDiagonalTrackdir(*trackdir)) {
00755     trdx += _trackdelta[*trackdir ^ 1].x;
00756     trdy += _trackdelta[*trackdir ^ 1].y;
00757   }
00758 
00759   /* validate the direction */
00760   while ((trdx <= 0 && dx > 0) ||
00761       (trdx >= 0 && dx < 0) ||
00762       (trdy <= 0 && dy > 0) ||
00763       (trdy >= 0 && dy < 0)) {
00764     if (!HasBit(*trackdir, 3)) { // first direction is invalid, try the other
00765       SetBit(*trackdir, 3); // reverse the direction
00766       trdx = -trdx;
00767       trdy = -trdy;
00768     } else { // other direction is invalid too, invalid drag
00769       return CMD_ERROR;
00770     }
00771   }
00772 
00773   /* (for diagonal tracks, this is already made sure of by above test), but:
00774    * for non-diagonal tracks, check if the start and end tile are on 1 line */
00775   if (!IsDiagonalTrackdir(*trackdir)) {
00776     trdx = _trackdelta[*trackdir].x;
00777     trdy = _trackdelta[*trackdir].y;
00778     if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx)) return CMD_ERROR;
00779   }
00780 
00781   return CommandCost();
00782 }
00783 
00797 static CommandCost CmdRailTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00798 {
00799   CommandCost total_cost(EXPENSES_CONSTRUCTION);
00800   Track track = Extract<Track, 4, 3>(p2);
00801   bool remove = HasBit(p2, 7);
00802   RailType railtype = Extract<RailType, 0, 4>(p2);
00803 
00804   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
00805   if (p1 >= MapSize()) return CMD_ERROR;
00806   TileIndex end_tile = p1;
00807   Trackdir trackdir = TrackToTrackdir(track);
00808 
00809   CommandCost ret = ValidateAutoDrag(&trackdir, tile, end_tile);
00810   if (ret.Failed()) return ret;
00811 
00812   if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, tile);
00813 
00814   bool had_success = false;
00815   CommandCost last_error = CMD_ERROR;
00816   for (;;) {
00817     CommandCost ret = DoCommand(tile, railtype, TrackdirToTrack(trackdir), flags, remove ? CMD_REMOVE_SINGLE_RAIL : CMD_BUILD_SINGLE_RAIL);
00818 
00819     if (ret.Failed()) {
00820       last_error = ret;
00821       if (last_error.GetErrorMessage() != STR_ERROR_ALREADY_BUILT && !remove) {
00822         if (HasBit(p2, 8)) return last_error;
00823         break;
00824       }
00825 
00826       /* Ownership errors are more important. */
00827       if (last_error.GetErrorMessage() == STR_ERROR_OWNED_BY && remove) break;
00828     } else {
00829       had_success = true;
00830       total_cost.AddCost(ret);
00831     }
00832 
00833     if (tile == end_tile) break;
00834 
00835     tile += ToTileIndexDiff(_trackdelta[trackdir]);
00836 
00837     /* toggle railbit for the non-diagonal tracks */
00838     if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
00839   }
00840 
00841   if (had_success) return total_cost;
00842   return last_error;
00843 }
00844 
00859 CommandCost CmdBuildRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00860 {
00861   return CmdRailTrackHelper(tile, flags, p1, ClrBit(p2, 7), text);
00862 }
00863 
00878 CommandCost CmdRemoveRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00879 {
00880   return CmdRailTrackHelper(tile, flags, p1, SetBit(p2, 7), text);
00881 }
00882 
00895 CommandCost CmdBuildTrainDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00896 {
00897   /* check railtype and valid direction for depot (0 through 3), 4 in total */
00898   RailType railtype = Extract<RailType, 0, 4>(p1);
00899   if (!ValParamRailtype(railtype)) return CMD_ERROR;
00900 
00901   Slope tileh = GetTileSlope(tile);
00902 
00903   DiagDirection dir = Extract<DiagDirection, 0, 2>(p2);
00904 
00905   /* Prohibit construction if
00906    * The tile is non-flat AND
00907    * 1) build-on-slopes is disabled
00908    * 2) the tile is steep i.e. spans two height levels
00909    * 3) the exit points in the wrong direction
00910    */
00911 
00912   if (tileh != SLOPE_FLAT && (
00913         !_settings_game.construction.build_on_slopes ||
00914         !CanBuildDepotByTileh(dir, tileh)
00915       )) {
00916     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00917   }
00918 
00919   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00920   if (cost.Failed()) return cost;
00921 
00922   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
00923 
00924   if (!Depot::CanAllocateItem()) return CMD_ERROR;
00925 
00926   if (flags & DC_EXEC) {
00927     Depot *d = new Depot(tile);
00928     d->build_date = _date;
00929 
00930     MakeRailDepot(tile, _current_company, d->index, dir, railtype);
00931     MarkTileDirtyByTile(tile);
00932     MakeDefaultName(d);
00933 
00934     Company::Get(_current_company)->infrastructure.rail[railtype]++;
00935     DirtyCompanyInfrastructureWindows(_current_company);
00936 
00937     AddSideToSignalBuffer(tile, INVALID_DIAGDIR, _current_company);
00938     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
00939   }
00940 
00941   cost.AddCost(_price[PR_BUILD_DEPOT_TRAIN]);
00942   cost.AddCost(RailBuildCost(railtype));
00943   return cost;
00944 }
00945 
00967 CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00968 {
00969   Track track = Extract<Track, 0, 3>(p1);
00970   bool ctrl_pressed = HasBit(p1, 3); // was the CTRL button pressed
00971   SignalVariant sigvar = (ctrl_pressed ^ HasBit(p1, 4)) ? SIG_SEMAPHORE : SIG_ELECTRIC; // the signal variant of the new signal
00972   SignalType sigtype = Extract<SignalType, 5, 3>(p1); // the signal type of the new signal
00973   bool convert_signal = HasBit(p1, 8); // convert button pressed
00974   SignalType cycle_start = Extract<SignalType, 9, 3>(p1);
00975   SignalType cycle_stop = Extract<SignalType, 12, 3>(p1);
00976   uint num_dir_cycle = GB(p1, 15, 2);
00977 
00978   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
00979   if (cycle_start > cycle_stop || cycle_stop > SIGTYPE_LAST) return CMD_ERROR;
00980 
00981   /* You can only build signals on plain rail tiles, and the selected track must exist */
00982   if (!ValParamTrackOrientation(track) || !IsPlainRailTile(tile) ||
00983       !HasTrack(tile, track)) {
00984     return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
00985   }
00986   CommandCost ret = EnsureNoTrainOnTrack(tile, track);
00987   if (ret.Failed()) return ret;
00988 
00989   /* Protect against invalid signal copying */
00990   if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
00991 
00992   ret = CheckTileOwnership(tile);
00993   if (ret.Failed()) return ret;
00994 
00995   {
00996     /* See if this is a valid track combination for signals, (ie, no overlap) */
00997     TrackBits trackbits = GetTrackBits(tile);
00998     if (KillFirstBit(trackbits) != TRACK_BIT_NONE && // More than one track present
00999         trackbits != TRACK_BIT_HORZ &&
01000         trackbits != TRACK_BIT_VERT) {
01001       return_cmd_error(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK);
01002     }
01003   }
01004 
01005   /* In case we don't want to change an existing signal, return without error. */
01006   if (HasBit(p1, 17) && HasSignalOnTrack(tile, track)) return CommandCost();
01007 
01008   /* you can not convert a signal if no signal is on track */
01009   if (convert_signal && !HasSignalOnTrack(tile, track)) return_cmd_error(STR_ERROR_THERE_ARE_NO_SIGNALS);
01010 
01011   CommandCost cost;
01012   if (!HasSignalOnTrack(tile, track)) {
01013     /* build new signals */
01014     cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS]);
01015   } else {
01016     if (p2 != 0 && sigvar != GetSignalVariant(tile, track)) {
01017       /* convert signals <-> semaphores */
01018       cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
01019 
01020     } else if (convert_signal) {
01021       /* convert button pressed */
01022       if (ctrl_pressed || GetSignalVariant(tile, track) != sigvar) {
01023         /* convert electric <-> semaphore */
01024         cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
01025       } else {
01026         /* it is free to change signal type: normal-pre-exit-combo */
01027         cost = CommandCost();
01028       }
01029 
01030     } else {
01031       /* it is free to change orientation/pre-exit-combo signals */
01032       cost = CommandCost();
01033     }
01034   }
01035 
01036   if (flags & DC_EXEC) {
01037     Train *v = NULL;
01038     /* The new/changed signal could block our path. As this can lead to
01039      * stale reservations, we clear the path reservation here and try
01040      * to redo it later on. */
01041     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
01042       v = GetTrainForReservation(tile, track);
01043       if (v != NULL) FreeTrainTrackReservation(v);
01044     }
01045 
01046     if (!HasSignals(tile)) {
01047       /* there are no signals at all on this tile yet */
01048       SetHasSignals(tile, true);
01049       SetSignalStates(tile, 0xF); // all signals are on
01050       SetPresentSignals(tile, 0); // no signals built by default
01051       SetSignalType(tile, track, sigtype);
01052       SetSignalVariant(tile, track, sigvar);
01053     }
01054 
01055     /* Subtract old signal infrastructure count. */
01056     Company::Get(GetTileOwner(tile))->infrastructure.signal -= CountBits(GetPresentSignals(tile));
01057 
01058     if (p2 == 0) {
01059       if (!HasSignalOnTrack(tile, track)) {
01060         /* build new signals */
01061         SetPresentSignals(tile, GetPresentSignals(tile) | (IsPbsSignal(sigtype) ? KillFirstBit(SignalOnTrack(track)) : SignalOnTrack(track)));
01062         SetSignalType(tile, track, sigtype);
01063         SetSignalVariant(tile, track, sigvar);
01064         while (num_dir_cycle-- > 0) CycleSignalSide(tile, track);
01065       } else {
01066         if (convert_signal) {
01067           /* convert signal button pressed */
01068           if (ctrl_pressed) {
01069             /* toggle the pressent signal variant: SIG_ELECTRIC <-> SIG_SEMAPHORE */
01070             SetSignalVariant(tile, track, (GetSignalVariant(tile, track) == SIG_ELECTRIC) ? SIG_SEMAPHORE : SIG_ELECTRIC);
01071             /* Query current signal type so the check for PBS signals below works. */
01072             sigtype = GetSignalType(tile, track);
01073           } else {
01074             /* convert the present signal to the chosen type and variant */
01075             SetSignalType(tile, track, sigtype);
01076             SetSignalVariant(tile, track, sigvar);
01077             if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
01078               SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
01079             }
01080           }
01081 
01082         } else if (ctrl_pressed) {
01083           /* cycle between cycle_start and cycle_end */
01084           sigtype = (SignalType)(GetSignalType(tile, track) + 1);
01085 
01086           if (sigtype < cycle_start || sigtype > cycle_stop) sigtype = cycle_start;
01087 
01088           SetSignalType(tile, track, sigtype);
01089           if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
01090             SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
01091           }
01092         } else {
01093           /* cycle the signal side: both -> left -> right -> both -> ... */
01094           CycleSignalSide(tile, track);
01095           /* Query current signal type so the check for PBS signals below works. */
01096           sigtype = GetSignalType(tile, track);
01097         }
01098       }
01099     } else {
01100       /* If CmdBuildManySignals is called with copying signals, just copy the
01101        * direction of the first signal given as parameter by CmdBuildManySignals */
01102       SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | (p2 & SignalOnTrack(track)));
01103       SetSignalVariant(tile, track, sigvar);
01104       SetSignalType(tile, track, sigtype);
01105     }
01106 
01107     /* Add new signal infrastructure count. */
01108     Company::Get(GetTileOwner(tile))->infrastructure.signal += CountBits(GetPresentSignals(tile));
01109     DirtyCompanyInfrastructureWindows(GetTileOwner(tile));
01110 
01111     if (IsPbsSignal(sigtype)) {
01112       /* PBS signals should show red unless they are on a reservation. */
01113       uint mask = GetPresentSignals(tile) & SignalOnTrack(track);
01114       SetSignalStates(tile, (GetSignalStates(tile) & ~mask) | ((HasBit(GetRailReservationTrackBits(tile), track) ? UINT_MAX : 0) & mask));
01115     }
01116     MarkTileDirtyByTile(tile);
01117     AddTrackToSignalBuffer(tile, track, _current_company);
01118     YapfNotifyTrackLayoutChange(tile, track);
01119     if (v != NULL) {
01120       /* Extend the train's path if it's not stopped or loading, or not at a safe position. */
01121       if (!(((v->vehstatus & VS_STOPPED) && v->cur_speed == 0) || v->current_order.IsType(OT_LOADING)) ||
01122           !IsSafeWaitingPosition(v, v->tile, v->GetVehicleTrackdir(), true, _settings_game.pf.forbid_90_deg)) {
01123         TryPathReserve(v, true);
01124       }
01125     }
01126   }
01127 
01128   return cost;
01129 }
01130 
01131 static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
01132 {
01133   tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
01134   if (tile == INVALID_TILE) return false;
01135 
01136   /* Check for track bits on the new tile */
01137   TrackdirBits trackdirbits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
01138 
01139   if (TracksOverlap(TrackdirBitsToTrackBits(trackdirbits))) return false;
01140   trackdirbits &= TrackdirReachesTrackdirs(trackdir);
01141 
01142   /* No track bits, must stop */
01143   if (trackdirbits == TRACKDIR_BIT_NONE) return false;
01144 
01145   /* Get the first track dir */
01146   trackdir = RemoveFirstTrackdir(&trackdirbits);
01147 
01148   /* Any left? It's a junction so we stop */
01149   if (trackdirbits != TRACKDIR_BIT_NONE) return false;
01150 
01151   switch (GetTileType(tile)) {
01152     case MP_RAILWAY:
01153       if (IsRailDepot(tile)) return false;
01154       if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
01155       signal_ctr++;
01156       if (IsDiagonalTrackdir(trackdir)) {
01157         signal_ctr++;
01158         /* Ensure signal_ctr even so X and Y pieces get signals */
01159         ClrBit(signal_ctr, 0);
01160       }
01161       return true;
01162 
01163     case MP_ROAD:
01164       if (!IsLevelCrossing(tile)) return false;
01165       signal_ctr += 2;
01166       return true;
01167 
01168     case MP_TUNNELBRIDGE: {
01169       TileIndex orig_tile = tile; // backup old value
01170 
01171       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
01172       if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
01173 
01174       /* Skip to end of tunnel or bridge
01175        * note that tile is a parameter by reference, so it must be updated */
01176       tile = GetOtherTunnelBridgeEnd(tile);
01177 
01178       signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
01179       return true;
01180     }
01181 
01182     default: return false;
01183   }
01184 }
01185 
01202 static CommandCost CmdSignalTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01203 {
01204   CommandCost total_cost(EXPENSES_CONSTRUCTION);
01205   TileIndex start_tile = tile;
01206 
01207   Track track = Extract<Track, 0, 3>(p2);
01208   bool mode = HasBit(p2, 3);
01209   bool semaphores = HasBit(p2, 4);
01210   bool remove = HasBit(p2, 5);
01211   bool autofill = HasBit(p2, 6);
01212   byte signal_density = GB(p2, 24, 8);
01213 
01214   if (p1 >= MapSize() || !ValParamTrackOrientation(track)) return CMD_ERROR;
01215   TileIndex end_tile = p1;
01216   if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
01217 
01218   if (!IsPlainRailTile(tile)) return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
01219 
01220   /* for vertical/horizontal tracks, double the given signals density
01221    * since the original amount will be too dense (shorter tracks) */
01222   signal_density *= 2;
01223 
01224   Trackdir trackdir = TrackToTrackdir(track);
01225   CommandCost ret = ValidateAutoDrag(&trackdir, tile, end_tile);
01226   if (ret.Failed()) return ret;
01227 
01228   track = TrackdirToTrack(trackdir); // trackdir might have changed, keep track in sync
01229   Trackdir start_trackdir = trackdir;
01230 
01231   /* Must start on a valid track to be able to avoid loops */
01232   if (!HasTrack(tile, track)) return CMD_ERROR;
01233 
01234   SignalType sigtype = (SignalType)GB(p2, 7, 3);
01235   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
01236 
01237   byte signals;
01238   /* copy the signal-style of the first rail-piece if existing */
01239   if (HasSignalOnTrack(tile, track)) {
01240     signals = GetPresentSignals(tile) & SignalOnTrack(track);
01241     assert(signals != 0);
01242 
01243     /* copy signal/semaphores style (independent of CTRL) */
01244     semaphores = GetSignalVariant(tile, track) != SIG_ELECTRIC;
01245 
01246     sigtype = GetSignalType(tile, track);
01247     /* Don't but copy entry or exit-signal type */
01248     if (sigtype == SIGTYPE_ENTRY || sigtype == SIGTYPE_EXIT) sigtype = SIGTYPE_NORMAL;
01249   } else { // no signals exist, drag a two-way signal stretch
01250     signals = IsPbsSignal(sigtype) ? SignalAlongTrackdir(trackdir) : SignalOnTrack(track);
01251   }
01252 
01253   byte signal_dir = 0;
01254   if (signals & SignalAlongTrackdir(trackdir))   SetBit(signal_dir, 0);
01255   if (signals & SignalAgainstTrackdir(trackdir)) SetBit(signal_dir, 1);
01256 
01257   /* signal_ctr         - amount of tiles already processed
01258    * signals_density    - setting to put signal on every Nth tile (double space on |, -- tracks)
01259    **********
01260    * trackdir   - trackdir to build with autorail
01261    * semaphores - semaphores or signals
01262    * signals    - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
01263    *              and convert all others to semaphore/signal
01264    * remove     - 1 remove signals, 0 build signals */
01265   int signal_ctr = 0;
01266   CommandCost last_error = CMD_ERROR;
01267   bool had_success = false;
01268   for (;;) {
01269     /* only build/remove signals with the specified density */
01270     if (remove || signal_ctr % signal_density == 0) {
01271       uint32 p1 = GB(TrackdirToTrack(trackdir), 0, 3);
01272       SB(p1, 3, 1, mode);
01273       SB(p1, 4, 1, semaphores);
01274       SB(p1, 5, 3, sigtype);
01275       if (!remove && signal_ctr == 0) SetBit(p1, 17);
01276 
01277       /* Pick the correct orientation for the track direction */
01278       signals = 0;
01279       if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
01280       if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
01281 
01282       CommandCost ret = DoCommand(tile, p1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
01283 
01284       /* Be user-friendly and try placing signals as much as possible */
01285       if (ret.Succeeded()) {
01286         had_success = true;
01287         total_cost.AddCost(ret);
01288       } else {
01289         /* The "No railway" error is the least important one. */
01290         if (ret.GetErrorMessage() != STR_ERROR_THERE_IS_NO_RAILROAD_TRACK ||
01291             last_error.GetErrorMessage() == INVALID_STRING_ID) {
01292           last_error = ret;
01293         }
01294       }
01295     }
01296 
01297     if (autofill) {
01298       if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
01299 
01300       /* Prevent possible loops */
01301       if (tile == start_tile && trackdir == start_trackdir) break;
01302     } else {
01303       if (tile == end_tile) break;
01304 
01305       tile += ToTileIndexDiff(_trackdelta[trackdir]);
01306       signal_ctr++;
01307 
01308       /* toggle railbit for the non-diagonal tracks (|, -- tracks) */
01309       if (IsDiagonalTrackdir(trackdir)) {
01310         signal_ctr++;
01311       } else {
01312         ToggleBit(trackdir, 0);
01313       }
01314     }
01315   }
01316 
01317   return had_success ? total_cost : last_error;
01318 }
01319 
01338 CommandCost CmdBuildSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01339 {
01340   return CmdSignalTrackHelper(tile, flags, p1, p2, text);
01341 }
01342 
01355 CommandCost CmdRemoveSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01356 {
01357   Track track = Extract<Track, 0, 3>(p1);
01358 
01359   if (!ValParamTrackOrientation(track) || !IsPlainRailTile(tile) || !HasTrack(tile, track)) {
01360     return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
01361   }
01362   if (!HasSignalOnTrack(tile, track)) {
01363     return_cmd_error(STR_ERROR_THERE_ARE_NO_SIGNALS);
01364   }
01365   CommandCost ret = EnsureNoTrainOnTrack(tile, track);
01366   if (ret.Failed()) return ret;
01367 
01368   /* Only water can remove signals from anyone */
01369   if (_current_company != OWNER_WATER) {
01370     CommandCost ret = CheckTileOwnership(tile);
01371     if (ret.Failed()) return ret;
01372   }
01373 
01374   /* Do it? */
01375   if (flags & DC_EXEC) {
01376     Train *v = NULL;
01377     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
01378       v = GetTrainForReservation(tile, track);
01379     } else if (IsPbsSignal(GetSignalType(tile, track))) {
01380       /* PBS signal, might be the end of a path reservation. */
01381       Trackdir td = TrackToTrackdir(track);
01382       for (int i = 0; v == NULL && i < 2; i++, td = ReverseTrackdir(td)) {
01383         /* Only test the active signal side. */
01384         if (!HasSignalOnTrackdir(tile, ReverseTrackdir(td))) continue;
01385         TileIndex next = TileAddByDiagDir(tile, TrackdirToExitdir(td));
01386         TrackBits tracks = TrackdirBitsToTrackBits(TrackdirReachesTrackdirs(td));
01387         if (HasReservedTracks(next, tracks)) {
01388           v = GetTrainForReservation(next, TrackBitsToTrack(GetReservedTrackbits(next) & tracks));
01389         }
01390       }
01391     }
01392     Company::Get(GetTileOwner(tile))->infrastructure.signal -= CountBits(GetPresentSignals(tile));
01393     SetPresentSignals(tile, GetPresentSignals(tile) & ~SignalOnTrack(track));
01394     Company::Get(GetTileOwner(tile))->infrastructure.signal += CountBits(GetPresentSignals(tile));
01395     DirtyCompanyInfrastructureWindows(GetTileOwner(tile));
01396 
01397     /* removed last signal from tile? */
01398     if (GetPresentSignals(tile) == 0) {
01399       SetSignalStates(tile, 0);
01400       SetHasSignals(tile, false);
01401       SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
01402     }
01403 
01404     AddTrackToSignalBuffer(tile, track, GetTileOwner(tile));
01405     YapfNotifyTrackLayoutChange(tile, track);
01406     if (v != NULL) TryPathReserve(v, false);
01407 
01408     MarkTileDirtyByTile(tile);
01409   }
01410 
01411   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_SIGNALS]);
01412 }
01413 
01432 CommandCost CmdRemoveSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01433 {
01434   return CmdSignalTrackHelper(tile, flags, p1, SetBit(p2, 5), text); // bit 5 is remove bit
01435 }
01436 
01438 static Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
01439 {
01440   if (v->type != VEH_TRAIN) return NULL;
01441 
01442   TrainList *affected_trains = static_cast<TrainList*>(data);
01443   affected_trains->Include(Train::From(v)->First());
01444 
01445   return NULL;
01446 }
01447 
01460 CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01461 {
01462   RailType totype = Extract<RailType, 0, 4>(p2);
01463 
01464   if (!ValParamRailtype(totype)) return CMD_ERROR;
01465   if (p1 >= MapSize()) return CMD_ERROR;
01466 
01467   TrainList affected_trains;
01468 
01469   CommandCost cost(EXPENSES_CONSTRUCTION);
01470   CommandCost error = CommandCost(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK); // by default, there is no track to convert.
01471   TileArea ta(tile, p1);
01472   TileIterator *iter = HasBit(p2, 4) ? (TileIterator *)new DiagonalTileIterator(tile, p1) : new OrthogonalTileIterator(ta);
01473   for (; (tile = *iter) != INVALID_TILE; ++(*iter)) {
01474     TileType tt = GetTileType(tile);
01475 
01476     /* Check if there is any track on tile */
01477     switch (tt) {
01478       case MP_RAILWAY:
01479         break;
01480       case MP_STATION:
01481         if (!HasStationRail(tile)) continue;
01482         break;
01483       case MP_ROAD:
01484         if (!IsLevelCrossing(tile)) continue;
01485         if (RailNoLevelCrossings(totype)) {
01486           error.MakeError(STR_ERROR_CROSSING_DISALLOWED);
01487           continue;
01488         }
01489         break;
01490       case MP_TUNNELBRIDGE:
01491         if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
01492         break;
01493       default: continue;
01494     }
01495 
01496     /* Original railtype we are converting from */
01497     RailType type = GetRailType(tile);
01498 
01499     /* Converting to the same type or converting 'hidden' elrail -> rail */
01500     if (type == totype || (_settings_game.vehicle.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
01501 
01502     /* Trying to convert other's rail */
01503     CommandCost ret = CheckTileOwnership(tile);
01504     if (ret.Failed()) {
01505       error = ret;
01506       continue;
01507     }
01508 
01509     SmallVector<Train *, 2> vehicles_affected;
01510 
01511     /* Vehicle on the tile when not converting Rail <-> ElRail
01512      * Tunnels and bridges have special check later */
01513     if (tt != MP_TUNNELBRIDGE) {
01514       if (!IsCompatibleRail(type, totype)) {
01515         CommandCost ret = EnsureNoVehicleOnGround(tile);
01516         if (ret.Failed()) {
01517           error = ret;
01518           continue;
01519         }
01520       }
01521       if (flags & DC_EXEC) { // we can safely convert, too
01522         TrackBits reserved = GetReservedTrackbits(tile);
01523         Track     track;
01524         while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
01525           Train *v = GetTrainForReservation(tile, track);
01526           if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
01527             /* No power on new rail type, reroute. */
01528             FreeTrainTrackReservation(v);
01529             *vehicles_affected.Append() = v;
01530           }
01531         }
01532 
01533         /* Update the company infrastructure counters. */
01534         if (!IsRailStationTile(tile) || !IsStationTileBlocked(tile)) {
01535           Company *c = Company::Get(GetTileOwner(tile));
01536           uint num_pieces = IsLevelCrossingTile(tile) ? LEVELCROSSING_TRACKBIT_FACTOR : 1;
01537           if (IsPlainRailTile(tile)) {
01538             TrackBits bits = GetTrackBits(tile);
01539             num_pieces = CountBits(bits);
01540             if (TracksOverlap(bits)) num_pieces *= num_pieces;
01541           }
01542           c->infrastructure.rail[type] -= num_pieces;
01543           c->infrastructure.rail[totype] += num_pieces;
01544           DirtyCompanyInfrastructureWindows(c->index);
01545         }
01546 
01547         SetRailType(tile, totype);
01548         MarkTileDirtyByTile(tile);
01549         /* update power of train on this tile */
01550         FindVehicleOnPos(tile, &affected_trains, &UpdateTrainPowerProc);
01551       }
01552     }
01553 
01554     switch (tt) {
01555       case MP_RAILWAY:
01556         switch (GetRailTileType(tile)) {
01557           case RAIL_TILE_DEPOT:
01558             if (flags & DC_EXEC) {
01559               /* notify YAPF about the track layout change */
01560               YapfNotifyTrackLayoutChange(tile, GetRailDepotTrack(tile));
01561 
01562               /* Update build vehicle window related to this depot */
01563               InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
01564               InvalidateWindowData(WC_BUILD_VEHICLE, tile);
01565             }
01566             cost.AddCost(RailConvertCost(type, totype));
01567             break;
01568 
01569           default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
01570             if (flags & DC_EXEC) {
01571               /* notify YAPF about the track layout change */
01572               TrackBits tracks = GetTrackBits(tile);
01573               while (tracks != TRACK_BIT_NONE) {
01574                 YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
01575               }
01576             }
01577             cost.AddCost(RailConvertCost(type, totype) * CountBits(GetTrackBits(tile)));
01578             break;
01579         }
01580         break;
01581 
01582       case MP_TUNNELBRIDGE: {
01583         TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
01584 
01585         /* If both ends of tunnel/bridge are in the range, do not try to convert twice -
01586          * it would cause assert because of different test and exec runs */
01587         if (endtile < tile && TileX(endtile) >= TileX(ta.tile) && TileX(endtile) < TileX(ta.tile) + ta.w &&
01588             TileY(endtile) >= TileY(ta.tile) && TileY(endtile) < TileY(ta.tile) + ta.h) continue;
01589 
01590         /* When not coverting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
01591         if (!IsCompatibleRail(GetRailType(tile), totype)) {
01592           CommandCost ret = TunnelBridgeIsFree(tile, endtile);
01593           if (ret.Failed()) {
01594             error = ret;
01595             continue;
01596           }
01597         }
01598 
01599         if (flags & DC_EXEC) {
01600           Track track = DiagDirToDiagTrack(GetTunnelBridgeDirection(tile));
01601           if (HasTunnelBridgeReservation(tile)) {
01602             Train *v = GetTrainForReservation(tile, track);
01603             if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
01604               /* No power on new rail type, reroute. */
01605               FreeTrainTrackReservation(v);
01606               *vehicles_affected.Append() = v;
01607             }
01608           }
01609 
01610           /* Update the company infrastructure counters. */
01611           uint num_pieces = (GetTunnelBridgeLength(tile, endtile) + 2) * TUNNELBRIDGE_TRACKBIT_FACTOR;
01612           Company *c = Company::Get(GetTileOwner(tile));
01613           c->infrastructure.rail[GetRailType(tile)] -= num_pieces;
01614           c->infrastructure.rail[totype] += num_pieces;
01615           DirtyCompanyInfrastructureWindows(c->index);
01616 
01617           SetRailType(tile, totype);
01618           SetRailType(endtile, totype);
01619 
01620           FindVehicleOnPos(tile, &affected_trains, &UpdateTrainPowerProc);
01621           FindVehicleOnPos(endtile, &affected_trains, &UpdateTrainPowerProc);
01622 
01623           YapfNotifyTrackLayoutChange(tile, track);
01624           YapfNotifyTrackLayoutChange(endtile, track);
01625 
01626           MarkTileDirtyByTile(tile);
01627           MarkTileDirtyByTile(endtile);
01628 
01629           if (IsBridge(tile)) {
01630             TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
01631             TileIndex t = tile + delta;
01632             for (; t != endtile; t += delta) MarkTileDirtyByTile(t); // TODO encapsulate this into a function
01633           }
01634         }
01635 
01636         cost.AddCost((GetTunnelBridgeLength(tile, endtile) + 2) * RailConvertCost(type, totype));
01637         break;
01638       }
01639 
01640       default: // MP_STATION, MP_ROAD
01641         if (flags & DC_EXEC) {
01642           Track track = ((tt == MP_STATION) ? GetRailStationTrack(tile) : GetCrossingRailTrack(tile));
01643           YapfNotifyTrackLayoutChange(tile, track);
01644         }
01645 
01646         cost.AddCost(RailConvertCost(type, totype));
01647         break;
01648     }
01649 
01650     for (uint i = 0; i < vehicles_affected.Length(); ++i) {
01651       TryPathReserve(vehicles_affected[i], true);
01652     }
01653   }
01654 
01655   if (flags & DC_EXEC) {
01656     /* Railtype changed, update trains as when entering different track */
01657     for (Train **v = affected_trains.Begin(); v != affected_trains.End(); v++) {
01658       (*v)->RailtypeChanged();
01659     }
01660   }
01661 
01662   delete iter;
01663   return (cost.GetCost() == 0) ? error : cost;
01664 }
01665 
01666 static CommandCost RemoveTrainDepot(TileIndex tile, DoCommandFlag flags)
01667 {
01668   if (_current_company != OWNER_WATER) {
01669     CommandCost ret = CheckTileOwnership(tile);
01670     if (ret.Failed()) return ret;
01671   }
01672 
01673   CommandCost ret = EnsureNoVehicleOnGround(tile);
01674   if (ret.Failed()) return ret;
01675 
01676   if (flags & DC_EXEC) {
01677     /* read variables before the depot is removed */
01678     DiagDirection dir = GetRailDepotDirection(tile);
01679     Owner owner = GetTileOwner(tile);
01680     Train *v = NULL;
01681 
01682     if (HasDepotReservation(tile)) {
01683       v = GetTrainForReservation(tile, DiagDirToDiagTrack(dir));
01684       if (v != NULL) FreeTrainTrackReservation(v);
01685     }
01686 
01687     Company::Get(owner)->infrastructure.rail[GetRailType(tile)]--;
01688     DirtyCompanyInfrastructureWindows(owner);
01689 
01690     delete Depot::GetByTile(tile);
01691     DoClearSquare(tile);
01692     AddSideToSignalBuffer(tile, dir, owner);
01693     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
01694     if (v != NULL) TryPathReserve(v, true);
01695   }
01696 
01697   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_TRAIN]);
01698 }
01699 
01700 static CommandCost ClearTile_Track(TileIndex tile, DoCommandFlag flags)
01701 {
01702   CommandCost cost(EXPENSES_CONSTRUCTION);
01703 
01704   if (flags & DC_AUTO) {
01705     if (!IsTileOwner(tile, _current_company)) {
01706       return_cmd_error(STR_ERROR_AREA_IS_OWNED_BY_ANOTHER);
01707     }
01708 
01709     if (IsPlainRail(tile)) {
01710       return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
01711     } else {
01712       return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
01713     }
01714   }
01715 
01716   switch (GetRailTileType(tile)) {
01717     case RAIL_TILE_SIGNALS:
01718     case RAIL_TILE_NORMAL: {
01719       Slope tileh = GetTileSlope(tile);
01720       /* Is there flat water on the lower halftile that gets cleared expensively? */
01721       bool water_ground = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh));
01722 
01723       TrackBits tracks = GetTrackBits(tile);
01724       while (tracks != TRACK_BIT_NONE) {
01725         Track track = RemoveFirstTrack(&tracks);
01726         CommandCost ret = DoCommand(tile, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
01727         if (ret.Failed()) return ret;
01728         cost.AddCost(ret);
01729       }
01730 
01731       /* when bankrupting, don't make water dirty, there could be a ship on lower halftile */
01732       if (water_ground && !(flags & DC_BANKRUPT)) {
01733         CommandCost ret = EnsureNoVehicleOnGround(tile);
01734         if (ret.Failed()) return ret;
01735 
01736         /* The track was removed, and left a coast tile. Now also clear the water. */
01737         if (flags & DC_EXEC) DoClearSquare(tile);
01738         cost.AddCost(_price[PR_CLEAR_WATER]);
01739       }
01740 
01741       return cost;
01742     }
01743 
01744     case RAIL_TILE_DEPOT:
01745       return RemoveTrainDepot(tile, flags);
01746 
01747     default:
01748       return CMD_ERROR;
01749   }
01750 }
01751 
01756 static uint GetSaveSlopeZ(uint x, uint y, Track track)
01757 {
01758   switch (track) {
01759     case TRACK_UPPER: x &= ~0xF; y &= ~0xF; break;
01760     case TRACK_LOWER: x |=  0xF; y |=  0xF; break;
01761     case TRACK_LEFT:  x |=  0xF; y &= ~0xF; break;
01762     case TRACK_RIGHT: x &= ~0xF; y |=  0xF; break;
01763     default: break;
01764   }
01765   return GetSlopePixelZ(x, y);
01766 }
01767 
01768 static void DrawSingleSignal(TileIndex tile, Track track, byte condition, uint image, uint pos)
01769 {
01770   bool side = (_settings_game.vehicle.road_side != 0) && _settings_game.construction.signal_side;
01771   static const Point SignalPositions[2][12] = {
01772     { // Signals on the left side
01773     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
01774       { 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
01775     /*  LOWER     LOWER     X         X         Y         Y     */
01776       {11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
01777     }, { // Signals on the right side
01778     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
01779       {14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
01780     /*  LOWER     LOWER     X         X         Y         Y     */
01781       {14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
01782     }
01783   };
01784 
01785   uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
01786   uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
01787 
01788   SpriteID sprite;
01789 
01790   SignalType type       = GetSignalType(tile, track);
01791   SignalVariant variant = GetSignalVariant(tile, track);
01792 
01793   if (type == SIGTYPE_NORMAL && variant == SIG_ELECTRIC) {
01794     /* Normal electric signals are picked from original sprites. */
01795     sprite = SPR_ORIGINAL_SIGNALS_BASE + image + condition;
01796   } else {
01797     /* All other signals are picked from add on sprites. */
01798     sprite = SPR_SIGNALS_BASE + (type - 1) * 16 + variant * 64 + image + condition + (type > SIGTYPE_LAST_NOPBS ? 64 : 0);
01799   }
01800 
01801   AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, GetSaveSlopeZ(x, y, track));
01802 }
01803 
01804 static uint32 _drawtile_track_palette;
01805 
01806 
01807 static void DrawTrackFence_NW(const TileInfo *ti, SpriteID base_image)
01808 {
01809   RailFenceOffset rfo = RFO_FLAT_X;
01810   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
01811   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01812     ti->x, ti->y + 1, 16, 1, 4, ti->z);
01813 }
01814 
01815 static void DrawTrackFence_SE(const TileInfo *ti, SpriteID base_image)
01816 {
01817   RailFenceOffset rfo = RFO_FLAT_X;
01818   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
01819   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01820     ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
01821 }
01822 
01823 static void DrawTrackFence_NW_SE(const TileInfo *ti, SpriteID base_image)
01824 {
01825   DrawTrackFence_NW(ti, base_image);
01826   DrawTrackFence_SE(ti, base_image);
01827 }
01828 
01829 static void DrawTrackFence_NE(const TileInfo *ti, SpriteID base_image)
01830 {
01831   RailFenceOffset rfo = RFO_FLAT_Y;
01832   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
01833   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01834     ti->x + 1, ti->y, 1, 16, 4, ti->z);
01835 }
01836 
01837 static void DrawTrackFence_SW(const TileInfo *ti, SpriteID base_image)
01838 {
01839   RailFenceOffset rfo = RFO_FLAT_Y;
01840   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
01841   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01842     ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
01843 }
01844 
01845 static void DrawTrackFence_NE_SW(const TileInfo *ti, SpriteID base_image)
01846 {
01847   DrawTrackFence_NE(ti, base_image);
01848   DrawTrackFence_SW(ti, base_image);
01849 }
01850 
01854 static void DrawTrackFence_NS_1(const TileInfo *ti, SpriteID base_image)
01855 {
01856   int z = ti->z + GetSlopePixelZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_W);
01857   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
01858     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01859 }
01860 
01864 static void DrawTrackFence_NS_2(const TileInfo *ti, SpriteID base_image)
01865 {
01866   int z = ti->z + GetSlopePixelZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_E);
01867   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
01868     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01869 }
01870 
01874 static void DrawTrackFence_WE_1(const TileInfo *ti, SpriteID base_image)
01875 {
01876   int z = ti->z + GetSlopePixelZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_N);
01877   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
01878     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01879 }
01880 
01884 static void DrawTrackFence_WE_2(const TileInfo *ti, SpriteID base_image)
01885 {
01886   int z = ti->z + GetSlopePixelZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_S);
01887   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
01888     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01889 }
01890 
01891 
01892 static void DrawTrackDetails(const TileInfo *ti, const RailtypeInfo *rti)
01893 {
01894   /* Base sprite for track fences.
01895    * Note: Halftile slopes only have fences on the upper part. */
01896   SpriteID base_image = GetCustomRailSprite(rti, ti->tile, RTSG_FENCES, IsHalftileSlope(ti->tileh) ? TCX_UPPER_HALFTILE : TCX_NORMAL);
01897   if (base_image == 0) base_image = SPR_TRACK_FENCE_FLAT_X;
01898 
01899   switch (GetRailGroundType(ti->tile)) {
01900     case RAIL_GROUND_FENCE_NW:     DrawTrackFence_NW(ti, base_image);    break;
01901     case RAIL_GROUND_FENCE_SE:     DrawTrackFence_SE(ti, base_image);    break;
01902     case RAIL_GROUND_FENCE_SENW:   DrawTrackFence_NW_SE(ti, base_image); break;
01903     case RAIL_GROUND_FENCE_NE:     DrawTrackFence_NE(ti, base_image);    break;
01904     case RAIL_GROUND_FENCE_SW:     DrawTrackFence_SW(ti, base_image);    break;
01905     case RAIL_GROUND_FENCE_NESW:   DrawTrackFence_NE_SW(ti, base_image); break;
01906     case RAIL_GROUND_FENCE_VERT1:  DrawTrackFence_NS_1(ti, base_image);  break;
01907     case RAIL_GROUND_FENCE_VERT2:  DrawTrackFence_NS_2(ti, base_image);  break;
01908     case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti, base_image);  break;
01909     case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti, base_image);  break;
01910     case RAIL_GROUND_WATER: {
01911       Corner track_corner;
01912       if (IsHalftileSlope(ti->tileh)) {
01913         /* Steep slope or one-corner-raised slope with halftile foundation */
01914         track_corner = GetHalftileSlopeCorner(ti->tileh);
01915       } else {
01916         /* Three-corner-raised slope */
01917         track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
01918       }
01919       switch (track_corner) {
01920         case CORNER_W: DrawTrackFence_NS_1(ti, base_image); break;
01921         case CORNER_S: DrawTrackFence_WE_2(ti, base_image); break;
01922         case CORNER_E: DrawTrackFence_NS_2(ti, base_image); break;
01923         case CORNER_N: DrawTrackFence_WE_1(ti, base_image); break;
01924         default: NOT_REACHED();
01925       }
01926       break;
01927     }
01928     default: break;
01929   }
01930 }
01931 
01932 /* SubSprite for drawing the track halftile of 'three-corners-raised'-sloped rail sprites. */
01933 static const int INF = 1000; // big number compared to tilesprite size
01934 static const SubSprite _halftile_sub_sprite[4] = {
01935   { -INF    , -INF  , 32 - 33, INF     }, // CORNER_W, clip 33 pixels from right
01936   { -INF    ,  0 + 7, INF    , INF     }, // CORNER_S, clip 7 pixels from top
01937   { -31 + 33, -INF  , INF    , INF     }, // CORNER_E, clip 33 pixels from left
01938   { -INF    , -INF  , INF    , 30 - 23 }  // CORNER_N, clip 23 pixels from bottom
01939 };
01940 
01941 static inline void DrawTrackSprite(SpriteID sprite, PaletteID pal, const TileInfo *ti, Slope s)
01942 {
01943   DrawGroundSprite(sprite, pal, NULL, 0, (ti->tileh & s) ? -8 : 0);
01944 }
01945 
01946 static void DrawTrackBitsOverlay(TileInfo *ti, TrackBits track, const RailtypeInfo *rti)
01947 {
01948   RailGroundType rgt = GetRailGroundType(ti->tile);
01949   Foundation f = GetRailFoundation(ti->tileh, track);
01950   Corner halftile_corner = CORNER_INVALID;
01951 
01952   if (IsNonContinuousFoundation(f)) {
01953     /* Save halftile corner */
01954     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
01955     /* Draw lower part first */
01956     track &= ~CornerToTrackBits(halftile_corner);
01957     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
01958   }
01959 
01960   DrawFoundation(ti, f);
01961   /* DrawFoundation modifies ti */
01962 
01963   /* Draw ground */
01964   if (rgt == RAIL_GROUND_WATER) {
01965     if (track != TRACK_BIT_NONE || IsSteepSlope(ti->tileh)) {
01966       /* three-corner-raised slope or steep slope with track on upper part */
01967       DrawShoreTile(ti->tileh);
01968     } else {
01969       /* single-corner-raised slope with track on upper part */
01970       DrawGroundSprite(SPR_FLAT_WATER_TILE, PAL_NONE);
01971     }
01972   } else {
01973     SpriteID image;
01974 
01975     switch (rgt) {
01976       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
01977       case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
01978       default:                     image = SPR_FLAT_GRASS_TILE; break;
01979     }
01980 
01981     image += SlopeToSpriteOffset(ti->tileh);
01982 
01983     DrawGroundSprite(image, PAL_NONE);
01984   }
01985 
01986   SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
01987   SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
01988   TrackBits pbs = _settings_client.gui.show_track_reservation ? GetRailReservationTrackBits(ti->tile) : TRACK_BIT_NONE;
01989 
01990   if (track == TRACK_BIT_NONE) {
01991     /* Half-tile foundation, no track here? */
01992   } else if (ti->tileh == SLOPE_NW && track == TRACK_BIT_Y) {
01993     DrawGroundSprite(ground + RTO_SLOPE_NW, PAL_NONE);
01994     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 9, PALETTE_CRASH);
01995   } else if (ti->tileh == SLOPE_NE && track == TRACK_BIT_X) {
01996     DrawGroundSprite(ground + RTO_SLOPE_NE, PAL_NONE);
01997     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 6, PALETTE_CRASH);
01998   } else if (ti->tileh == SLOPE_SE && track == TRACK_BIT_Y) {
01999     DrawGroundSprite(ground + RTO_SLOPE_SE, PAL_NONE);
02000     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 7, PALETTE_CRASH);
02001   } else if (ti->tileh == SLOPE_SW && track == TRACK_BIT_X) {
02002     DrawGroundSprite(ground + RTO_SLOPE_SW, PAL_NONE);
02003     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 8, PALETTE_CRASH);
02004   } else {
02005     switch (track) {
02006       /* Draw single ground sprite when not overlapping. No track overlay
02007        * is necessary for these sprites. */
02008       case TRACK_BIT_X:     DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
02009       case TRACK_BIT_Y:     DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
02010       case TRACK_BIT_UPPER: DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N); break;
02011       case TRACK_BIT_LOWER: DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
02012       case TRACK_BIT_RIGHT: DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E); break;
02013       case TRACK_BIT_LEFT:  DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
02014       case TRACK_BIT_CROSS: DrawGroundSprite(ground + RTO_CROSSING_XY, PAL_NONE); break;
02015       case TRACK_BIT_HORZ:  DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N);
02016                             DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
02017       case TRACK_BIT_VERT:  DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E);
02018                             DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
02019 
02020       default:
02021         /* We're drawing a junction tile */
02022         if ((track & TRACK_BIT_3WAY_NE) == 0) {
02023           DrawGroundSprite(ground + RTO_JUNCTION_SW, PAL_NONE);
02024         } else if ((track & TRACK_BIT_3WAY_SW) == 0) {
02025           DrawGroundSprite(ground + RTO_JUNCTION_NE, PAL_NONE);
02026         } else if ((track & TRACK_BIT_3WAY_NW) == 0) {
02027           DrawGroundSprite(ground + RTO_JUNCTION_SE, PAL_NONE);
02028         } else if ((track & TRACK_BIT_3WAY_SE) == 0) {
02029           DrawGroundSprite(ground + RTO_JUNCTION_NW, PAL_NONE);
02030         } else {
02031           DrawGroundSprite(ground + RTO_JUNCTION_NSEW, PAL_NONE);
02032         }
02033 
02034         /* Mask out PBS bits as we shall draw them afterwards anyway. */
02035         track &= ~pbs;
02036 
02037         /* Draw regular track bits */
02038         if (track & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PAL_NONE);
02039         if (track & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PAL_NONE);
02040         if (track & TRACK_BIT_UPPER) DrawGroundSprite(overlay + RTO_N, PAL_NONE);
02041         if (track & TRACK_BIT_LOWER) DrawGroundSprite(overlay + RTO_S, PAL_NONE);
02042         if (track & TRACK_BIT_RIGHT) DrawGroundSprite(overlay + RTO_E, PAL_NONE);
02043         if (track & TRACK_BIT_LEFT)  DrawGroundSprite(overlay + RTO_W, PAL_NONE);
02044     }
02045 
02046     /* Draw reserved track bits */
02047     if (pbs & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH);
02048     if (pbs & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH);
02049     if (pbs & TRACK_BIT_UPPER) DrawTrackSprite(overlay + RTO_N, PALETTE_CRASH, ti, SLOPE_N);
02050     if (pbs & TRACK_BIT_LOWER) DrawTrackSprite(overlay + RTO_S, PALETTE_CRASH, ti, SLOPE_S);
02051     if (pbs & TRACK_BIT_RIGHT) DrawTrackSprite(overlay + RTO_E, PALETTE_CRASH, ti, SLOPE_E);
02052     if (pbs & TRACK_BIT_LEFT)  DrawTrackSprite(overlay + RTO_W, PALETTE_CRASH, ti, SLOPE_W);
02053   }
02054 
02055   if (IsValidCorner(halftile_corner)) {
02056     DrawFoundation(ti, HalftileFoundation(halftile_corner));
02057     overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY, TCX_UPPER_HALFTILE);
02058     ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND, TCX_UPPER_HALFTILE);
02059 
02060     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
02061     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
02062 
02063     SpriteID image;
02064     switch (rgt) {
02065       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
02066       case RAIL_GROUND_ICE_DESERT:
02067       case RAIL_GROUND_HALF_SNOW:  image = SPR_FLAT_SNOW_DESERT_TILE; break;
02068       default:                     image = SPR_FLAT_GRASS_TILE; break;
02069     }
02070 
02071     image += SlopeToSpriteOffset(fake_slope);
02072 
02073     DrawGroundSprite(image, PAL_NONE, &(_halftile_sub_sprite[halftile_corner]));
02074 
02075     track = CornerToTrackBits(halftile_corner);
02076 
02077     int offset;
02078     switch (track) {
02079       default: NOT_REACHED();
02080       case TRACK_BIT_UPPER: offset = RTO_N; break;
02081       case TRACK_BIT_LOWER: offset = RTO_S; break;
02082       case TRACK_BIT_RIGHT: offset = RTO_E; break;
02083       case TRACK_BIT_LEFT:  offset = RTO_W; break;
02084     }
02085 
02086     DrawTrackSprite(ground + offset, PAL_NONE, ti, fake_slope);
02087     if (_settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, track)) {
02088       DrawTrackSprite(overlay + offset, PALETTE_CRASH, ti, fake_slope);
02089     }
02090   }
02091 }
02092 
02098 static void DrawTrackBits(TileInfo *ti, TrackBits track)
02099 {
02100   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
02101 
02102   if (rti->UsesOverlay()) {
02103     DrawTrackBitsOverlay(ti, track, rti);
02104     return;
02105   }
02106 
02107   RailGroundType rgt = GetRailGroundType(ti->tile);
02108   Foundation f = GetRailFoundation(ti->tileh, track);
02109   Corner halftile_corner = CORNER_INVALID;
02110 
02111   if (IsNonContinuousFoundation(f)) {
02112     /* Save halftile corner */
02113     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
02114     /* Draw lower part first */
02115     track &= ~CornerToTrackBits(halftile_corner);
02116     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
02117   }
02118 
02119   DrawFoundation(ti, f);
02120   /* DrawFoundation modifies ti */
02121 
02122   SpriteID image;
02123   PaletteID pal = PAL_NONE;
02124   const SubSprite *sub = NULL;
02125   bool junction = false;
02126 
02127   /* Select the sprite to use. */
02128   if (track == 0) {
02129     /* Clear ground (only track on halftile foundation) */
02130     if (rgt == RAIL_GROUND_WATER) {
02131       if (IsSteepSlope(ti->tileh)) {
02132         DrawShoreTile(ti->tileh);
02133         image = 0;
02134       } else {
02135         image = SPR_FLAT_WATER_TILE;
02136       }
02137     } else {
02138       switch (rgt) {
02139         case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
02140         case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
02141         default:                     image = SPR_FLAT_GRASS_TILE; break;
02142       }
02143       image += SlopeToSpriteOffset(ti->tileh);
02144     }
02145   } else {
02146     if (ti->tileh != SLOPE_FLAT) {
02147       /* track on non-flat ground */
02148       image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
02149     } else {
02150       /* track on flat ground */
02151       (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
02152       (image++,                           track == TRACK_BIT_X) ||
02153       (image++,                           track == TRACK_BIT_UPPER) ||
02154       (image++,                           track == TRACK_BIT_LOWER) ||
02155       (image++,                           track == TRACK_BIT_RIGHT) ||
02156       (image++,                           track == TRACK_BIT_LEFT) ||
02157       (image++,                           track == TRACK_BIT_CROSS) ||
02158 
02159       (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
02160       (image++,                            track == TRACK_BIT_VERT) ||
02161 
02162       (junction = true, false) ||
02163       (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
02164       (image++,                          (track & TRACK_BIT_3WAY_SW) == 0) ||
02165       (image++,                          (track & TRACK_BIT_3WAY_NW) == 0) ||
02166       (image++,                          (track & TRACK_BIT_3WAY_SE) == 0) ||
02167       (image++, true);
02168     }
02169 
02170     switch (rgt) {
02171       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
02172       case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset;  break;
02173       case RAIL_GROUND_WATER: {
02174         /* three-corner-raised slope */
02175         DrawShoreTile(ti->tileh);
02176         Corner track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
02177         sub = &(_halftile_sub_sprite[track_corner]);
02178         break;
02179       }
02180       default: break;
02181     }
02182   }
02183 
02184   if (image != 0) DrawGroundSprite(image, pal, sub);
02185 
02186   /* Draw track pieces individually for junction tiles */
02187   if (junction) {
02188     if (track & TRACK_BIT_X)     DrawGroundSprite(rti->base_sprites.single_x, PAL_NONE);
02189     if (track & TRACK_BIT_Y)     DrawGroundSprite(rti->base_sprites.single_y, PAL_NONE);
02190     if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PAL_NONE);
02191     if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PAL_NONE);
02192     if (track & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PAL_NONE);
02193     if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PAL_NONE);
02194   }
02195 
02196   /* PBS debugging, draw reserved tracks darker */
02197   if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation) {
02198     /* Get reservation, but mask track on halftile slope */
02199     TrackBits pbs = GetRailReservationTrackBits(ti->tile) & track;
02200     if (pbs & TRACK_BIT_X) {
02201       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
02202         DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH);
02203       } else {
02204         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
02205       }
02206     }
02207     if (pbs & TRACK_BIT_Y) {
02208       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
02209         DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH);
02210       } else {
02211         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
02212       }
02213     }
02214     if (pbs & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_N ? -(int)TILE_HEIGHT : 0);
02215     if (pbs & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_S ? -(int)TILE_HEIGHT : 0);
02216     if (pbs & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_W ? -(int)TILE_HEIGHT : 0);
02217     if (pbs & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_E ? -(int)TILE_HEIGHT : 0);
02218   }
02219 
02220   if (IsValidCorner(halftile_corner)) {
02221     DrawFoundation(ti, HalftileFoundation(halftile_corner));
02222 
02223     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
02224     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
02225     image = _track_sloped_sprites[fake_slope - 1] + rti->base_sprites.track_y;
02226     pal = PAL_NONE;
02227     switch (rgt) {
02228       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
02229       case RAIL_GROUND_ICE_DESERT:
02230       case RAIL_GROUND_HALF_SNOW:  image += rti->snow_offset;  break; // higher part has snow in this case too
02231       default: break;
02232     }
02233     DrawGroundSprite(image, pal, &(_halftile_sub_sprite[halftile_corner]));
02234 
02235     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, CornerToTrackBits(halftile_corner))) {
02236       static const byte _corner_to_track_sprite[] = {3, 1, 2, 0};
02237       DrawGroundSprite(_corner_to_track_sprite[halftile_corner] + rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, -(int)TILE_HEIGHT);
02238     }
02239   }
02240 }
02241 
02249 enum SignalOffsets {
02250   SIGNAL_TO_SOUTHWEST =  0,
02251   SIGNAL_TO_NORTHEAST =  2,
02252   SIGNAL_TO_SOUTHEAST =  4,
02253   SIGNAL_TO_NORTHWEST =  6,
02254   SIGNAL_TO_EAST      =  8,
02255   SIGNAL_TO_WEST      = 10,
02256   SIGNAL_TO_SOUTH     = 12,
02257   SIGNAL_TO_NORTH     = 14,
02258 };
02259 
02260 static void DrawSignals(TileIndex tile, TrackBits rails)
02261 {
02262 #define MAYBE_DRAW_SIGNAL(x, y, z, t) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, t, GetSingleSignalState(tile, x), y, z)
02263 
02264   if (!(rails & TRACK_BIT_Y)) {
02265     if (!(rails & TRACK_BIT_X)) {
02266       if (rails & TRACK_BIT_LEFT) {
02267         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTH, 0, TRACK_LEFT);
02268         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTH, 1, TRACK_LEFT);
02269       }
02270       if (rails & TRACK_BIT_RIGHT) {
02271         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_NORTH, 2, TRACK_RIGHT);
02272         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_SOUTH, 3, TRACK_RIGHT);
02273       }
02274       if (rails & TRACK_BIT_UPPER) {
02275         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_WEST, 4, TRACK_UPPER);
02276         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_EAST, 5, TRACK_UPPER);
02277       }
02278       if (rails & TRACK_BIT_LOWER) {
02279         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_WEST, 6, TRACK_LOWER);
02280         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_EAST, 7, TRACK_LOWER);
02281       }
02282     } else {
02283       MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHWEST, 8, TRACK_X);
02284       MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHEAST, 9, TRACK_X);
02285     }
02286   } else {
02287     MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHEAST, 10, TRACK_Y);
02288     MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHWEST, 11, TRACK_Y);
02289   }
02290 }
02291 
02292 static void DrawTile_Track(TileInfo *ti)
02293 {
02294   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
02295 
02296   _drawtile_track_palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
02297 
02298   if (IsPlainRail(ti->tile)) {
02299     TrackBits rails = GetTrackBits(ti->tile);
02300 
02301     DrawTrackBits(ti, rails);
02302 
02303     if (HasBit(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti, rti);
02304 
02305     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
02306 
02307     if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
02308   } else {
02309     /* draw depot */
02310     const DrawTileSprites *dts;
02311     PaletteID pal = PAL_NONE;
02312     SpriteID relocation;
02313 
02314     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
02315 
02316     if (IsInvisibilitySet(TO_BUILDINGS)) {
02317       /* Draw rail instead of depot */
02318       dts = &_depot_invisible_gfx_table[GetRailDepotDirection(ti->tile)];
02319     } else {
02320       dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
02321     }
02322 
02323     SpriteID image;
02324     if (rti->UsesOverlay()) {
02325       image = SPR_FLAT_GRASS_TILE;
02326     } else {
02327       image = dts->ground.sprite;
02328       if (image != SPR_FLAT_GRASS_TILE) image += rti->GetRailtypeSpriteOffset();
02329     }
02330 
02331     /* adjust ground tile for desert
02332      * don't adjust for snow, because snow in depots looks weird */
02333     if (IsSnowRailGround(ti->tile) && _settings_game.game_creation.landscape == LT_TROPIC) {
02334       if (image != SPR_FLAT_GRASS_TILE) {
02335         image += rti->snow_offset; // tile with tracks
02336       } else {
02337         image = SPR_FLAT_SNOW_DESERT_TILE; // flat ground
02338       }
02339     }
02340 
02341     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, _drawtile_track_palette));
02342 
02343     if (rti->UsesOverlay()) {
02344       SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
02345 
02346       switch (GetRailDepotDirection(ti->tile)) {
02347         case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02348         case DIAGDIR_SW: DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
02349         case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02350         case DIAGDIR_SE: DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
02351         default: break;
02352       }
02353 
02354       if (_settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
02355         SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
02356 
02357         switch (GetRailDepotDirection(ti->tile)) {
02358           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02359           case DIAGDIR_SW: DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH); break;
02360           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02361           case DIAGDIR_SE: DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH); break;
02362           default: break;
02363         }
02364       }
02365     } else {
02366       /* PBS debugging, draw reserved tracks darker */
02367       if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
02368         switch (GetRailDepotDirection(ti->tile)) {
02369           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02370           case DIAGDIR_SW: DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH); break;
02371           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02372           case DIAGDIR_SE: DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH); break;
02373           default: break;
02374         }
02375       }
02376     }
02377     int depot_sprite = GetCustomRailSprite(rti, ti->tile, RTSG_DEPOT);
02378     relocation = depot_sprite != 0 ? depot_sprite - SPR_RAIL_DEPOT_SE_1 : rti->GetRailtypeSpriteOffset();
02379 
02380     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
02381 
02382     DrawRailTileSeq(ti, dts, TO_BUILDINGS, relocation, 0, _drawtile_track_palette);
02383   }
02384   DrawBridgeMiddle(ti);
02385 }
02386 
02387 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
02388 {
02389   const DrawTileSprites *dts = &_depot_gfx_table[dir];
02390   const RailtypeInfo *rti = GetRailTypeInfo(railtype);
02391   SpriteID image = rti->UsesOverlay() ? SPR_FLAT_GRASS_TILE : dts->ground.sprite;
02392   uint32 offset = rti->GetRailtypeSpriteOffset();
02393 
02394   x += 33;
02395   y += 17;
02396 
02397   if (image != SPR_FLAT_GRASS_TILE) image += offset;
02398   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
02399 
02400   DrawSprite(image, PAL_NONE, x, y);
02401 
02402   if (rti->UsesOverlay()) {
02403     SpriteID ground = GetCustomRailSprite(rti, INVALID_TILE, RTSG_GROUND);
02404 
02405     switch (dir) {
02406       case DIAGDIR_SW: DrawSprite(ground + RTO_X, PAL_NONE, x, y); break;
02407       case DIAGDIR_SE: DrawSprite(ground + RTO_Y, PAL_NONE, x, y); break;
02408       default: break;
02409     }
02410   }
02411   int depot_sprite = GetCustomRailSprite(rti, INVALID_TILE, RTSG_DEPOT);
02412   if (depot_sprite != 0) offset = depot_sprite - SPR_RAIL_DEPOT_SE_1;
02413 
02414   DrawRailTileSeqInGUI(x, y, dts, offset, 0, palette);
02415 }
02416 
02417 static int GetSlopePixelZ_Track(TileIndex tile, uint x, uint y)
02418 {
02419   if (IsPlainRail(tile)) {
02420     int z;
02421     Slope tileh = GetTilePixelSlope(tile, &z);
02422     if (tileh == SLOPE_FLAT) return z;
02423 
02424     z += ApplyPixelFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
02425     return z + GetPartialPixelZ(x & 0xF, y & 0xF, tileh);
02426   } else {
02427     return GetTileMaxPixelZ(tile);
02428   }
02429 }
02430 
02431 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
02432 {
02433   return IsPlainRail(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
02434 }
02435 
02436 static void TileLoop_Track(TileIndex tile)
02437 {
02438   RailGroundType old_ground = GetRailGroundType(tile);
02439   RailGroundType new_ground;
02440 
02441   if (old_ground == RAIL_GROUND_WATER) {
02442     TileLoop_Water(tile);
02443     return;
02444   }
02445 
02446   switch (_settings_game.game_creation.landscape) {
02447     case LT_ARCTIC: {
02448       int z;
02449       Slope slope = GetTileSlope(tile, &z);
02450       bool half = false;
02451 
02452       /* for non-flat track, use lower part of track
02453        * in other cases, use the highest part with track */
02454       if (IsPlainRail(tile)) {
02455         TrackBits track = GetTrackBits(tile);
02456         Foundation f = GetRailFoundation(slope, track);
02457 
02458         switch (f) {
02459           case FOUNDATION_NONE:
02460             /* no foundation - is the track on the upper side of three corners raised tile? */
02461             if (IsSlopeWithThreeCornersRaised(slope)) z++;
02462             break;
02463 
02464           case FOUNDATION_INCLINED_X:
02465           case FOUNDATION_INCLINED_Y:
02466             /* sloped track - is it on a steep slope? */
02467             if (IsSteepSlope(slope)) z++;
02468             break;
02469 
02470           case FOUNDATION_STEEP_LOWER:
02471             /* only lower part of steep slope */
02472             z++;
02473             break;
02474 
02475           default:
02476             /* if it is a steep slope, then there is a track on higher part */
02477             if (IsSteepSlope(slope)) z++;
02478             z++;
02479             break;
02480         }
02481 
02482         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
02483       } else {
02484         /* is the depot on a non-flat tile? */
02485         if (slope != SLOPE_FLAT) z++;
02486       }
02487 
02488       /* 'z' is now the lowest part of the highest track bit -
02489        * for sloped track, it is 'z' of lower part
02490        * for two track bits, it is 'z' of higher track bit
02491        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
02492       if (z > GetSnowLine()) {
02493         if (half && z - GetSnowLine() == 1) {
02494           /* track on non-continuous foundation, lower part is not under snow */
02495           new_ground = RAIL_GROUND_HALF_SNOW;
02496         } else {
02497           new_ground = RAIL_GROUND_ICE_DESERT;
02498         }
02499         goto set_ground;
02500       }
02501       break;
02502       }
02503 
02504     case LT_TROPIC:
02505       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
02506         new_ground = RAIL_GROUND_ICE_DESERT;
02507         goto set_ground;
02508       }
02509       break;
02510   }
02511 
02512   new_ground = RAIL_GROUND_GRASS;
02513 
02514   if (IsPlainRail(tile) && old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
02515     /* determine direction of fence */
02516     TrackBits rail = GetTrackBits(tile);
02517 
02518     switch (rail) {
02519       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
02520       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
02521       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
02522       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
02523 
02524       default: {
02525         Owner owner = GetTileOwner(tile);
02526 
02527         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
02528               (rail & TRACK_BIT_3WAY_NW) == 0 &&
02529               (rail & TRACK_BIT_X)
02530             )) {
02531           TileIndex n = tile + TileDiffXY(0, -1);
02532           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02533 
02534           if ((!IsTileType(n, MP_RAILWAY) && !IsRailWaypointTile(n)) ||
02535               !IsTileOwner(n, owner) ||
02536               nrail == TRACK_BIT_UPPER ||
02537               nrail == TRACK_BIT_LEFT) {
02538             new_ground = RAIL_GROUND_FENCE_NW;
02539           }
02540         }
02541 
02542         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
02543               (rail & TRACK_BIT_3WAY_SE) == 0 &&
02544               (rail & TRACK_BIT_X)
02545             )) {
02546           TileIndex n = tile + TileDiffXY(0, 1);
02547           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02548 
02549           if ((!IsTileType(n, MP_RAILWAY) && !IsRailWaypointTile(n)) ||
02550               !IsTileOwner(n, owner) ||
02551               nrail == TRACK_BIT_LOWER ||
02552               nrail == TRACK_BIT_RIGHT) {
02553             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
02554               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
02555           }
02556         }
02557 
02558         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
02559               (rail & TRACK_BIT_3WAY_NE) == 0 &&
02560               (rail & TRACK_BIT_Y)
02561             )) {
02562           TileIndex n = tile + TileDiffXY(-1, 0);
02563           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02564 
02565           if ((!IsTileType(n, MP_RAILWAY) && !IsRailWaypointTile(n)) ||
02566               !IsTileOwner(n, owner) ||
02567               nrail == TRACK_BIT_UPPER ||
02568               nrail == TRACK_BIT_RIGHT) {
02569             new_ground = RAIL_GROUND_FENCE_NE;
02570           }
02571         }
02572 
02573         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
02574               (rail & TRACK_BIT_3WAY_SW) == 0 &&
02575               (rail & TRACK_BIT_Y)
02576             )) {
02577           TileIndex n = tile + TileDiffXY(1, 0);
02578           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02579 
02580           if ((!IsTileType(n, MP_RAILWAY) && !IsRailWaypointTile(n)) ||
02581               !IsTileOwner(n, owner) ||
02582               nrail == TRACK_BIT_LOWER ||
02583               nrail == TRACK_BIT_LEFT) {
02584             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
02585               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
02586           }
02587         }
02588         break;
02589       }
02590     }
02591   }
02592 
02593 set_ground:
02594   if (old_ground != new_ground) {
02595     SetRailGroundType(tile, new_ground);
02596     MarkTileDirtyByTile(tile);
02597   }
02598 }
02599 
02600 
02601 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
02602 {
02603   /* Case of half tile slope with water. */
02604   if (mode == TRANSPORT_WATER && IsPlainRail(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
02605     TrackBits tb = GetTrackBits(tile);
02606     switch (tb) {
02607       default: NOT_REACHED();
02608       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
02609       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
02610       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
02611       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
02612     }
02613     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
02614   }
02615 
02616   if (mode != TRANSPORT_RAIL) return 0;
02617 
02618   TrackBits trackbits = TRACK_BIT_NONE;
02619   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
02620 
02621   switch (GetRailTileType(tile)) {
02622     default: NOT_REACHED();
02623     case RAIL_TILE_NORMAL:
02624       trackbits = GetTrackBits(tile);
02625       break;
02626 
02627     case RAIL_TILE_SIGNALS: {
02628       trackbits = GetTrackBits(tile);
02629       byte a = GetPresentSignals(tile);
02630       uint b = GetSignalStates(tile);
02631 
02632       b &= a;
02633 
02634       /* When signals are not present (in neither direction),
02635        * we pretend them to be green. Otherwise, it depends on
02636        * the signal type. For signals that are only active from
02637        * one side, we set the missing signals explicitely to
02638        * `green'. Otherwise, they implicitely become `red'. */
02639       if (!IsOnewaySignal(tile, TRACK_UPPER) || (a & SignalOnTrack(TRACK_UPPER)) == 0) b |= ~a & SignalOnTrack(TRACK_UPPER);
02640       if (!IsOnewaySignal(tile, TRACK_LOWER) || (a & SignalOnTrack(TRACK_LOWER)) == 0) b |= ~a & SignalOnTrack(TRACK_LOWER);
02641 
02642       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
02643       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
02644       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
02645       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
02646 
02647       break;
02648     }
02649 
02650     case RAIL_TILE_DEPOT: {
02651       DiagDirection dir = GetRailDepotDirection(tile);
02652 
02653       if (side != INVALID_DIAGDIR && side != dir) break;
02654 
02655       trackbits = DiagDirToDiagTrackBits(dir);
02656       break;
02657     }
02658   }
02659 
02660   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
02661 }
02662 
02663 static bool ClickTile_Track(TileIndex tile)
02664 {
02665   if (!IsRailDepot(tile)) return false;
02666 
02667   ShowDepotWindow(tile, VEH_TRAIN);
02668   return true;
02669 }
02670 
02671 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
02672 {
02673   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
02674   td->rail_speed = rti->max_speed;
02675   td->owner[0] = GetTileOwner(tile);
02676   SetDParamX(td->dparam, 0, rti->strings.name);
02677   switch (GetRailTileType(tile)) {
02678     case RAIL_TILE_NORMAL:
02679       td->str = STR_LAI_RAIL_DESCRIPTION_TRACK;
02680       break;
02681 
02682     case RAIL_TILE_SIGNALS: {
02683       static const StringID signal_type[6][6] = {
02684         {
02685           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_SIGNALS,
02686           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
02687           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
02688           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
02689           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
02690           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS
02691         },
02692         {
02693           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
02694           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRESIGNALS,
02695           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
02696           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
02697           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
02698           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS
02699         },
02700         {
02701           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
02702           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
02703           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXITSIGNALS,
02704           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
02705           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
02706           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS
02707         },
02708         {
02709           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
02710           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
02711           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
02712           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBOSIGNALS,
02713           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
02714           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS
02715         },
02716         {
02717           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
02718           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
02719           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
02720           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
02721           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBSSIGNALS,
02722           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS
02723         },
02724         {
02725           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS,
02726           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS,
02727           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS,
02728           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS,
02729           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS,
02730           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NOENTRYSIGNALS
02731         }
02732       };
02733 
02734       SignalType primary_signal;
02735       SignalType secondary_signal;
02736       if (HasSignalOnTrack(tile, TRACK_UPPER)) {
02737         primary_signal = GetSignalType(tile, TRACK_UPPER);
02738         secondary_signal = HasSignalOnTrack(tile, TRACK_LOWER) ? GetSignalType(tile, TRACK_LOWER) : primary_signal;
02739       } else {
02740         secondary_signal = primary_signal = GetSignalType(tile, TRACK_LOWER);
02741       }
02742 
02743       td->str = signal_type[secondary_signal][primary_signal];
02744       break;
02745     }
02746 
02747     case RAIL_TILE_DEPOT:
02748       td->str = STR_LAI_RAIL_DESCRIPTION_TRAIN_DEPOT;
02749       if (_settings_game.vehicle.train_acceleration_model != AM_ORIGINAL) {
02750         if (td->rail_speed > 0) {
02751           td->rail_speed = min(td->rail_speed, 61);
02752         } else {
02753           td->rail_speed = 61;
02754         }
02755       }
02756       td->build_date = Depot::GetByTile(tile)->build_date;
02757       break;
02758 
02759     default:
02760       NOT_REACHED();
02761   }
02762 }
02763 
02764 static void ChangeTileOwner_Track(TileIndex tile, Owner old_owner, Owner new_owner)
02765 {
02766   if (!IsTileOwner(tile, old_owner)) return;
02767 
02768   if (new_owner != INVALID_OWNER) {
02769     /* Update company infrastructure counts. No need to dirty windows here, we'll redraw the whole screen anyway. */
02770     uint num_pieces = 1;
02771     if (IsPlainRail(tile)) {
02772       TrackBits bits = GetTrackBits(tile);
02773       num_pieces = CountBits(bits);
02774       if (TracksOverlap(bits)) num_pieces *= num_pieces;
02775     }
02776     RailType rt = GetRailType(tile);
02777     Company::Get(old_owner)->infrastructure.rail[rt] -= num_pieces;
02778     Company::Get(new_owner)->infrastructure.rail[rt] += num_pieces;
02779 
02780     if (HasSignals(tile)) {
02781       uint num_sigs = CountBits(GetPresentSignals(tile));
02782       Company::Get(old_owner)->infrastructure.signal -= num_sigs;
02783       Company::Get(new_owner)->infrastructure.signal += num_sigs;
02784     }
02785 
02786     SetTileOwner(tile, new_owner);
02787   } else {
02788     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
02789   }
02790 }
02791 
02792 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
02793 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
02794 static const int8 _deltacoord_leaveoffset[8] = {
02795   -1,  0,  1,  0, /* x */
02796    0,  1,  0, -1  /* y */
02797 };
02798 
02799 
02806 int TicksToLeaveDepot(const Train *v)
02807 {
02808   DiagDirection dir = GetRailDepotDirection(v->tile);
02809   int length = v->CalcNextVehicleOffset();
02810 
02811   switch (dir) {
02812     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
02813     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
02814     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
02815     default:
02816     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
02817   }
02818 
02819   return 0; // make compilers happy
02820 }
02821 
02826 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *u, TileIndex tile, int x, int y)
02827 {
02828   /* this routine applies only to trains in depot tiles */
02829   if (u->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
02830 
02831   Train *v = Train::From(u);
02832 
02833   /* depot direction */
02834   DiagDirection dir = GetRailDepotDirection(tile);
02835 
02836   /* Calculate the point where the following wagon should be activated. */
02837   int length = v->CalcNextVehicleOffset();
02838 
02839   byte fract_coord_leave =
02840     ((_fractcoords_enter[dir] & 0x0F) + // x
02841       (length + 1) * _deltacoord_leaveoffset[dir]) +
02842     (((_fractcoords_enter[dir] >> 4) +  // y
02843       ((length + 1) * _deltacoord_leaveoffset[dir + 4])) << 4);
02844 
02845   byte fract_coord = (x & 0xF) + ((y & 0xF) << 4);
02846 
02847   if (_fractcoords_behind[dir] == fract_coord) {
02848     /* make sure a train is not entering the tile from behind */
02849     return VETSB_CANNOT_ENTER;
02850   } else if (_fractcoords_enter[dir] == fract_coord) {
02851     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
02852       /* enter the depot */
02853       v->track = TRACK_BIT_DEPOT,
02854       v->vehstatus |= VS_HIDDEN; // hide it
02855       v->direction = ReverseDir(v->direction);
02856       if (v->Next() == NULL) VehicleEnterDepot(v->First());
02857       v->tile = tile;
02858 
02859       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
02860       return VETSB_ENTERED_WORMHOLE;
02861     }
02862   } else if (fract_coord_leave == fract_coord) {
02863     if (DiagDirToDir(dir) == v->direction) {
02864       /* leave the depot? */
02865       if ((v = v->Next()) != NULL) {
02866         v->vehstatus &= ~VS_HIDDEN;
02867         v->track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
02868       }
02869     }
02870   }
02871 
02872   return VETSB_CONTINUE;
02873 }
02874 
02886 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, int z_old, Slope tileh_old, int z_new, Slope tileh_new, TrackBits rail_bits)
02887 {
02888   if (!_settings_game.construction.build_on_slopes || !AutoslopeEnabled()) return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
02889 
02890   /* Is the slope-rail_bits combination valid in general? I.e. is it safe to call GetRailFoundation() ? */
02891   if (CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile).Failed()) return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
02892 
02893   /* Get the slopes on top of the foundations */
02894   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
02895   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
02896 
02897   Corner track_corner;
02898   switch (rail_bits) {
02899     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
02900     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
02901     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
02902     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
02903 
02904     /* Surface slope must not be changed */
02905     default:
02906       if (z_old != z_new || tileh_old != tileh_new) return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
02907       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
02908   }
02909 
02910   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
02911   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
02912   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
02913   if (z_old != z_new) return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
02914 
02915   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
02916   /* Make the ground dirty, if surface slope has changed */
02917   if (tileh_old != tileh_new) {
02918     /* If there is flat water on the lower halftile add the cost for clearing it */
02919     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price[PR_CLEAR_WATER]);
02920     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
02921   }
02922   return  cost;
02923 }
02924 
02925 static CommandCost TerraformTile_Track(TileIndex tile, DoCommandFlag flags, int z_new, Slope tileh_new)
02926 {
02927   int z_old;
02928   Slope tileh_old = GetTileSlope(tile, &z_old);
02929   if (IsPlainRail(tile)) {
02930     TrackBits rail_bits = GetTrackBits(tile);
02931     /* Is there flat water on the lower halftile that must be cleared expensively? */
02932     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
02933 
02934     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
02935     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
02936 
02937     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
02938     Corner allowed_corner;
02939     switch (rail_bits) {
02940       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
02941       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
02942       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
02943       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
02944       default: return autoslope_result;
02945     }
02946 
02947     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
02948 
02949     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
02950     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
02951 
02952     /* Everything is valid, which only changes allowed_corner */
02953     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
02954       if (allowed_corner == corner) continue;
02955       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
02956     }
02957 
02958     /* Make the ground dirty */
02959     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
02960 
02961     /* allow terraforming */
02962     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price[PR_CLEAR_WATER] : (Money)0);
02963   } else if (_settings_game.construction.build_on_slopes && AutoslopeEnabled() &&
02964       AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) {
02965     return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
02966   }
02967   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
02968 }
02969 
02970 
02971 extern const TileTypeProcs _tile_type_rail_procs = {
02972   DrawTile_Track,           // draw_tile_proc
02973   GetSlopePixelZ_Track,     // get_slope_z_proc
02974   ClearTile_Track,          // clear_tile_proc
02975   NULL,                     // add_accepted_cargo_proc
02976   GetTileDesc_Track,        // get_tile_desc_proc
02977   GetTileTrackStatus_Track, // get_tile_track_status_proc
02978   ClickTile_Track,          // click_tile_proc
02979   NULL,                     // animate_tile_proc
02980   TileLoop_Track,           // tile_loop_proc
02981   ChangeTileOwner_Track,    // change_tile_owner_proc
02982   NULL,                     // add_produced_cargo_proc
02983   VehicleEnter_Track,       // vehicle_enter_tile_proc
02984   GetFoundation_Track,      // get_foundation_proc
02985   TerraformTile_Track,      // terraform_tile_proc
02986 };