# rail_cmd.cpp

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    00001 /* $Id: rail_cmd.cpp 20521 2010-08-16 23:15:33Z rubidium $ */
    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 "landscape.h"
    00015 #include "viewport_func.h"
    00016 #include "command_func.h"
    00017 #include "engine_base.h"
    00018 #include "depot_base.h"
    00019 #include "pathfinder/yapf/yapf_cache.h"
    00020 #include "newgrf_engine.h"
    00021 #include "landscape_type.h"
    00022 #include "newgrf_railtype.h"
    00023 #include "newgrf_commons.h"
    00024 #include "train.h"
    00025 #include "variables.h"
    00026 #include "autoslope.h"
    00027 #include "water.h"
    00028 #include "tunnelbridge_map.h"
    00029 #include "window_func.h"
    00030 #include "vehicle_func.h"
    00031 #include "sound_func.h"
    00032 #include "tunnelbridge.h"
    00033 #include "functions.h"
    00034 #include "elrail_func.h"
    00035 #include "town.h"
    00036 #include "pbs.h"
    00037 #include "company_base.h"
    00038
    00039 #include "table/strings.h"
    00040 #include "table/sprites.h"
    00041 #include "table/railtypes.h"
    00042 #include "table/track_land.h"
    00043
    00045 typedef SmallVector<Train *, 16> TrainList;
    00046
    00047 RailtypeInfo _railtypes[RAILTYPE_END];
    00048
    00049 assert_compile(sizeof(_original_railtypes) <= sizeof(_railtypes));
    00050
    00054 void ResetRailTypes()
    00055 {
    00056   memset(_railtypes, 0, sizeof(_railtypes));
    00057   memcpy(_railtypes, _original_railtypes, sizeof(_original_railtypes));
    00058 }
    00059
    00060 void ResolveRailTypeGUISprites(RailtypeInfo *rti)
    00061 {
    00062   SpriteID cursors_base = GetCustomRailSprite(rti, INVALID_TILE, RTSG_CURSORS);
    00063   if (cursors_base != 0) {
    00064     rti->gui_sprites.build_ns_rail = cursors_base +  0;
    00065     rti->gui_sprites.build_x_rail  = cursors_base +  1;
    00066     rti->gui_sprites.build_ew_rail = cursors_base +  2;
    00067     rti->gui_sprites.build_y_rail  = cursors_base +  3;
    00068     rti->gui_sprites.auto_rail     = cursors_base +  4;
    00069     rti->gui_sprites.build_depot   = cursors_base +  5;
    00070     rti->gui_sprites.build_tunnel  = cursors_base +  6;
    00071     rti->gui_sprites.convert_rail  = cursors_base +  7;
    00072     rti->cursor.rail_ns   = cursors_base +  8;
    00073     rti->cursor.rail_swne = cursors_base +  9;
    00074     rti->cursor.rail_ew   = cursors_base + 10;
    00075     rti->cursor.rail_nwse = cursors_base + 11;
    00076     rti->cursor.autorail  = cursors_base + 12;
    00077     rti->cursor.depot     = cursors_base + 13;
    00078     rti->cursor.tunnel    = cursors_base + 14;
    00079     rti->cursor.convert   = cursors_base + 15;
    00080   }
    00081 }
    00082
    00083 void InitRailTypes()
    00084 {
    00085   for (RailType rt = RAILTYPE_BEGIN; rt != RAILTYPE_END; rt++) {
    00086     RailtypeInfo *rti = &_railtypes[rt];
    00087     ResolveRailTypeGUISprites(rti);
    00088   }
    00089 }
    00090
    00091 RailType AllocateRailType(RailTypeLabel label)
    00092 {
    00093   for (RailType rt = RAILTYPE_BEGIN; rt != RAILTYPE_END; rt++) {
    00094     RailtypeInfo *rti = &_railtypes[rt];
    00095
    00096     if (rti->label == 0) {
    00097       /* Set up new rail type */
    00098       memcpy(rti, &_railtypes[RAILTYPE_RAIL], sizeof(*rti));
    00099       rti->label = label;
    00100
    00101       /* Make us compatible with ourself. */
    00102       rti->powered_railtypes    = (RailTypes)(1 << rt);
    00103       rti->compatible_railtypes = (RailTypes)(1 << rt);
    00104       return rt;
    00105     }
    00106   }
    00107
    00108   return INVALID_RAILTYPE;
    00109 }
    00110
    00111 static const byte _track_sloped_sprites[14] = {
    00112   14, 15, 22, 13,
    00113    0, 21, 17, 12,
    00114   23,  0, 18, 20,
    00115   19, 16
    00116 };
    00117
    00118
    00119 /*         4
    00120  *     ---------
    00121  *    |\       /|
    00122  *    | \    1/ |
    00123  *    |  \   /  |
    00124  *    |   \ /   |
    00125  *  16|    \    |32
    00126  *    |   / \2  |
    00127  *    |  /   \  |
    00128  *    | /     \ |
    00129  *    |/       \|
    00130  *     ---------
    00131  *         8
    00132  */
    00133
    00134
    00135
    00136 /* MAP2 byte:    abcd???? => Signal On? Same coding as map3lo
    00137  * MAP3LO byte:  abcd???? => Signal Exists?
    00138  *               a and b are for diagonals, upper and left,
    00139  *               one for each direction. (ie a == NE->SW, b ==
    00140  *               SW->NE, or v.v., I don't know. b and c are
    00141  *               similar for lower and right.
    00142  * MAP2 byte:    ????abcd => Type of ground.
    00143  * MAP3LO byte:  ????abcd => Type of rail.
    00144  * MAP5:         00abcdef => rail
    00145  *               01abcdef => rail w/ signals
    00146  *               10uuuuuu => unused
    00147  *               11uuuudd => rail depot
    00148  */
    00149
    00150
    00151 Vehicle *EnsureNoTrainOnTrackProc(Vehicle *v, void *data)
    00152 {
    00153   TrackBits rail_bits = *(TrackBits *)data;
    00154
    00155   if (v->type != VEH_TRAIN) return NULL;
    00156
    00157   Train *t = Train::From(v);
    00158   if ((t->track != rail_bits) && !TracksOverlap(t->track | rail_bits)) return NULL;
    00159
    00160   _error_message = STR_ERROR_TRAIN_IN_THE_WAY + v->type;
    00161   return v;
    00162 }
    00163
    00171 static bool EnsureNoTrainOnTrack(TileIndex tile, Track track)
    00172 {
    00173   TrackBits rail_bits = TrackToTrackBits(track);
    00174
    00175   return !HasVehicleOnPos(tile, &rail_bits, &EnsureNoTrainOnTrackProc);
    00176 }
    00177
    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) {return IsValidTrack(track);}
    00364
    00373 CommandCost CmdBuildSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00374 {
    00375   RailType railtype = Extract<RailType, 0, 4>(p1);
    00376   Track track = Extract<Track, 0, 3>(p2);
    00377   CommandCost cost(EXPENSES_CONSTRUCTION);
    00378
    00379   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
    00380
    00381   Slope tileh = GetTileSlope(tile, NULL);
    00382   TrackBits trackbit = TrackToTrackBits(track);
    00383
    00384   switch (GetTileType(tile)) {
    00385     case MP_RAILWAY: {
    00386       if (!CheckTileOwnership(tile)) return CMD_ERROR;
    00387
    00388       if (!IsPlainRail(tile)) return CMD_ERROR;
    00389
    00390       if (!IsCompatibleRail(GetRailType(tile), railtype)) return_cmd_error(STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION);
    00391
    00392       CommandCost ret = CheckTrackCombination(tile, trackbit, flags);
    00393       ret.SetGlobalErrorMessage();
    00394       if (ret.Failed()) return ret;
    00395
    00396       if (!EnsureNoTrainOnTrack(tile, track)) return CMD_ERROR;
    00397
    00398       ret = CheckRailSlope(tileh, trackbit, GetTrackBits(tile), tile);
    00399       if (ret.Failed()) return ret;
    00400       cost.AddCost(ret);
    00401
    00402       /* If the rail types don't match, try to convert only if engines of
    00403        * the new rail type are not powered on the present rail type and engines of
    00404        * the present rail type are powered on the new rail type. */
    00405       if (GetRailType(tile) != railtype && !HasPowerOnRail(railtype, GetRailType(tile))) {
    00406         if (HasPowerOnRail(GetRailType(tile), railtype)) {
    00407           ret = DoCommand(tile, tile, railtype, flags, CMD_CONVERT_RAIL);
    00408           if (ret.Failed()) return ret;
    00409           cost.AddCost(ret);
    00410         } else {
    00411           return CMD_ERROR;
    00412         }
    00413       }
    00414
    00415       if (flags & DC_EXEC) {
    00416         SetRailGroundType(tile, RAIL_GROUND_BARREN);
    00417         SetTrackBits(tile, GetTrackBits(tile) | trackbit);
    00418       }
    00419       break;
    00420     }
    00421
    00422     case MP_ROAD:
    00423 #define M(x) (1 << (x))
    00424       /* Level crossings may only be built on these slopes */
    00425       if (!HasBit(M(SLOPE_SEN) | M(SLOPE_ENW) | M(SLOPE_NWS) | M(SLOPE_NS) | M(SLOPE_WSE) | M(SLOPE_EW) | M(SLOPE_FLAT), tileh)) {
    00426         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
    00427       }
    00428 #undef M
    00429
    00430       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00431
    00432       if (IsNormalRoad(tile)) {
    00433         if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
    00434
    00435         if (GetDisallowedRoadDirections(tile) != DRD_NONE) return_cmd_error(STR_ERROR_CROSSING_ON_ONEWAY_ROAD);
    00436
    00437         if (RailNoLevelCrossings(railtype)) return_cmd_error(STR_ERROR_CROSSING_DISALLOWED);
    00438
    00439         RoadTypes roadtypes = GetRoadTypes(tile);
    00440         RoadBits road = GetRoadBits(tile, ROADTYPE_ROAD);
    00441         RoadBits tram = GetRoadBits(tile, ROADTYPE_TRAM);
    00442         switch (roadtypes) {
    00443           default: break;
    00444           case ROADTYPES_TRAM:
    00445             /* Tram crossings must always have road. */
    00446             if (flags & DC_EXEC) SetRoadOwner(tile, ROADTYPE_ROAD, _current_company);
    00447             roadtypes |= ROADTYPES_ROAD;
    00448             break;
    00449
    00450           case ROADTYPES_ALL:
    00451             if (road != tram) return CMD_ERROR;
    00452             break;
    00453         }
    00454
    00455         road |= tram;
    00456
    00457         if ((track == TRACK_X && road == ROAD_Y) ||
    00458             (track == TRACK_Y && road == ROAD_X)) {
    00459           if (flags & DC_EXEC) {
    00460             MakeRoadCrossing(tile, GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), _current_company, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, roadtypes, GetTownIndex(tile));
    00461             UpdateLevelCrossing(tile, false);
    00462           }
    00463           break;
    00464         }
    00465       }
    00466
    00467       if (IsLevelCrossing(tile) && GetCrossingRailBits(tile) == trackbit) {
    00468         return_cmd_error(STR_ERROR_ALREADY_BUILT);
    00469       }
    00470       /* FALLTHROUGH */
    00471
    00472     default: {
    00473       /* Will there be flat water on the lower halftile? */
    00474       bool water_ground = IsTileType(tile, MP_WATER) && IsSlopeWithOneCornerRaised(tileh);
    00475
    00476       CommandCost ret = CheckRailSlope(tileh, trackbit, TRACK_BIT_NONE, tile);
    00477       if (ret.Failed()) return ret;
    00478       cost.AddCost(ret);
    00479
    00480       ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00481       if (ret.Failed()) return ret;
    00482       cost.AddCost(ret);
    00483
    00484       if (water_ground) {
    00485         cost.AddCost(-_price[PR_CLEAR_WATER]);
    00486         cost.AddCost(_price[PR_CLEAR_ROUGH]);
    00487       }
    00488
    00489       if (flags & DC_EXEC) {
    00490         MakeRailNormal(tile, _current_company, trackbit, railtype);
    00491         if (water_ground) SetRailGroundType(tile, RAIL_GROUND_WATER);
    00492       }
    00493       break;
    00494     }
    00495   }
    00496
    00497   if (flags & DC_EXEC) {
    00498     MarkTileDirtyByTile(tile);
    00499     AddTrackToSignalBuffer(tile, track, _current_company);
    00500     YapfNotifyTrackLayoutChange(tile, track);
    00501   }
    00502
    00503   cost.AddCost(RailBuildCost(railtype));
    00504   return cost;
    00505 }
    00506
    00515 CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00516 {
    00517   Track track = Extract<Track, 0, 3>(p2);
    00518   CommandCost cost(EXPENSES_CONSTRUCTION);
    00519   bool crossing = false;
    00520
    00521   if (!ValParamTrackOrientation(track)) return CMD_ERROR;
    00522   TrackBits trackbit = TrackToTrackBits(track);
    00523
    00524   /* Need to read tile owner now because it may change when the rail is removed
    00525    * Also, in case of floods, _current_company != owner
    00526    * There may be invalid tiletype even in exec run (when removing long track),
    00527    * so do not call GetTileOwner(tile) in any case here */
    00528   Owner owner = INVALID_OWNER;
    00529
    00530   Train *v = NULL;
    00531
    00532   switch (GetTileType(tile)) {
    00533     case MP_ROAD: {
    00534       if (!IsLevelCrossing(tile) ||
    00535           GetCrossingRailBits(tile) != trackbit ||
    00536           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
    00537           (!(flags & DC_BANKRUPT) && !EnsureNoVehicleOnGround(tile))) {
    00538         return CMD_ERROR;
    00539       }
    00540
    00541       cost.AddCost(RailClearCost(GetRailType(tile)));
    00542
    00543       if (flags & DC_EXEC) {
    00544         if (HasReservedTracks(tile, trackbit)) {
    00545           v = GetTrainForReservation(tile, track);
    00546           if (v != NULL) FreeTrainTrackReservation(v);
    00547         }
    00548         owner = GetTileOwner(tile);
    00549         MakeRoadNormal(tile, GetCrossingRoadBits(tile), GetRoadTypes(tile), GetTownIndex(tile), GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM));
    00550       }
    00551       break;
    00552     }
    00553
    00554     case MP_RAILWAY: {
    00555       TrackBits present;
    00556
    00557       if (!IsPlainRail(tile) ||
    00558           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
    00559           !EnsureNoTrainOnTrack(tile, track)) {
    00560         return CMD_ERROR;
    00561       }
    00562
    00563       present = GetTrackBits(tile);
    00564       if ((present & trackbit) == 0) return CMD_ERROR;
    00565       if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
    00566
    00567       cost.AddCost(RailClearCost(GetRailType(tile)));
    00568
    00569       /* Charge extra to remove signals on the track, if they are there */
    00570       if (HasSignalOnTrack(tile, track))
    00571         cost.AddCost(DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS));
    00572
    00573       if (flags & DC_EXEC) {
    00574         if (HasReservedTracks(tile, trackbit)) {
    00575           v = GetTrainForReservation(tile, track);
    00576           if (v != NULL) FreeTrainTrackReservation(v);
    00577         }
    00578         owner = GetTileOwner(tile);
    00579         present ^= trackbit;
    00580         if (present == 0) {
    00581           Slope tileh = GetTileSlope(tile, NULL);
    00582           /* If there is flat water on the lower halftile, convert the tile to shore so the water remains */
    00583           if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh)) {
    00584             MakeShore(tile);
    00585           } else {
    00586             DoClearSquare(tile);
    00587           }
    00588         } else {
    00589           SetTrackBits(tile, present);
    00590           SetTrackReservation(tile, GetRailReservationTrackBits(tile) & present);
    00591         }
    00592       }
    00593       break;
    00594     }
    00595
    00596     default: return CMD_ERROR;
    00597   }
    00598
    00599   if (flags & DC_EXEC) {
    00600     /* if we got that far, 'owner' variable is set correctly */
    00601     assert(Company::IsValidID(owner));
    00602
    00603     MarkTileDirtyByTile(tile);
    00604     if (crossing) {
    00605       /* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we
    00606        * are removing one of these pieces, we'll need to update signals for
    00607        * both directions explicitly, as after the track is removed it won't
    00608        * 'connect' with the other piece. */
    00609       AddTrackToSignalBuffer(tile, TRACK_X, owner);
    00610       AddTrackToSignalBuffer(tile, TRACK_Y, owner);
    00611       YapfNotifyTrackLayoutChange(tile, TRACK_X);
    00612       YapfNotifyTrackLayoutChange(tile, TRACK_Y);
    00613     } else {
    00614       AddTrackToSignalBuffer(tile, track, owner);
    00615       YapfNotifyTrackLayoutChange(tile, track);
    00616     }
    00617
    00618     if (v != NULL) TryPathReserve(v, true);
    00619   }
    00620
    00621   return cost;
    00622 }
    00623
    00624
    00632 bool FloodHalftile(TileIndex t)
    00633 {
    00634   assert(IsPlainRailTile(t));
    00635
    00636   bool flooded = false;
    00637   if (GetRailGroundType(t) == RAIL_GROUND_WATER) return flooded;
    00638
    00639   Slope tileh = GetTileSlope(t, NULL);
    00640   TrackBits rail_bits = GetTrackBits(t);
    00641
    00642   if (IsSlopeWithOneCornerRaised(tileh)) {
    00643     TrackBits lower_track = CornerToTrackBits(OppositeCorner(GetHighestSlopeCorner(tileh)));
    00644
    00645     TrackBits to_remove = lower_track & rail_bits;
    00646     if (to_remove != 0) {
    00647       _current_company = OWNER_WATER;
    00648       if (DoCommand(t, 0, FIND_FIRST_BIT(to_remove), DC_EXEC, CMD_REMOVE_SINGLE_RAIL).Failed()) return flooded; // not yet floodable
    00649       flooded = true;
    00650       rail_bits = rail_bits & ~to_remove;
    00651       if (rail_bits == 0) {
    00652         MakeShore(t);
    00653         MarkTileDirtyByTile(t);
    00654         return flooded;
    00655       }
    00656     }
    00657
    00658     if (IsNonContinuousFoundation(GetRailFoundation(tileh, rail_bits))) {
    00659       flooded = true;
    00660       SetRailGroundType(t, RAIL_GROUND_WATER);
    00661       MarkTileDirtyByTile(t);
    00662     }
    00663   } else {
    00664     /* Make shore on steep slopes and 'three-corners-raised'-slopes. */
    00665     if (ApplyFoundationToSlope(GetRailFoundation(tileh, rail_bits), &tileh) == 0) {
    00666       if (IsSteepSlope(tileh) || IsSlopeWithThreeCornersRaised(tileh)) {
    00667         flooded = true;
    00668         SetRailGroundType(t, RAIL_GROUND_WATER);
    00669         MarkTileDirtyByTile(t);
    00670       }
    00671     }
    00672   }
    00673   return flooded;
    00674 }
    00675
    00676 static const TileIndexDiffC _trackdelta[] = {
    00677   { -1,  0 }, {  0,  1 }, { -1,  0 }, {  0,  1 }, {  1,  0 }, {  0,  1 },
    00678   {  0,  0 },
    00679   {  0,  0 },
    00680   {  1,  0 }, {  0, -1 }, {  0, -1 }, {  1,  0 }, {  0, -1 }, { -1,  0 },
    00681   {  0,  0 },
    00682   {  0,  0 }
    00683 };
    00684
    00685
    00686 static CommandCost ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)
    00687 {
    00688   int x = TileX(start);
    00689   int y = TileY(start);
    00690   int ex = TileX(end);
    00691   int ey = TileY(end);
    00692
    00693   if (!ValParamTrackOrientation(TrackdirToTrack(*trackdir))) return CMD_ERROR;
    00694
    00695   /* calculate delta x,y from start to end tile */
    00696   int dx = ex - x;
    00697   int dy = ey - y;
    00698
    00699   /* calculate delta x,y for the first direction */
    00700   int trdx = _trackdelta[*trackdir].x;
    00701   int trdy = _trackdelta[*trackdir].y;
    00702
    00703   if (!IsDiagonalTrackdir(*trackdir)) {
    00704     trdx += _trackdelta[*trackdir ^ 1].x;
    00705     trdy += _trackdelta[*trackdir ^ 1].y;
    00706   }
    00707
    00708   /* validate the direction */
    00709   while (
    00710     (trdx <= 0 && dx > 0) ||
    00711     (trdx >= 0 && dx < 0) ||
    00712     (trdy <= 0 && dy > 0) ||
    00713     (trdy >= 0 && dy < 0)
    00714   ) {
    00715     if (!HasBit(*trackdir, 3)) { // first direction is invalid, try the other
    00716       SetBit(*trackdir, 3); // reverse the direction
    00717       trdx = -trdx;
    00718       trdy = -trdy;
    00719     } else { // other direction is invalid too, invalid drag
    00720       return CMD_ERROR;
    00721     }
    00722   }
    00723
    00724   /* (for diagonal tracks, this is already made sure of by above test), but:
    00725    * for non-diagonal tracks, check if the start and end tile are on 1 line */
    00726   if (!IsDiagonalTrackdir(*trackdir)) {
    00727     trdx = _trackdelta[*trackdir].x;
    00728     trdy = _trackdelta[*trackdir].y;
    00729     if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx))
    00730       return CMD_ERROR;
    00731   }
    00732
    00733   return CommandCost();
    00734 }
    00735
    00748 static CommandCost CmdRailTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00749 {
    00750   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
    00751   Track track = Extract<Track, 4, 3>(p2);
    00752   bool remove = HasBit(p2, 7);
    00753   RailType railtype = Extract<RailType, 0, 4>(p2);
    00754
    00755   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
    00756   if (p1 >= MapSize()) return CMD_ERROR;
    00757   TileIndex end_tile = p1;
    00758   Trackdir trackdir = TrackToTrackdir(track);
    00759
    00760   if (ValidateAutoDrag(&trackdir, tile, end_tile).Failed()) return CMD_ERROR;
    00761
    00762   if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, tile);
    00763
    00764   for (;;) {
    00765     ret = DoCommand(tile, railtype, TrackdirToTrack(trackdir), flags, remove ? CMD_REMOVE_SINGLE_RAIL : CMD_BUILD_SINGLE_RAIL);
    00766
    00767     if (ret.Failed()) {
    00768       if (_error_message != STR_ERROR_ALREADY_BUILT && !remove) {
    00769         if (HasBit(p2, 8)) return CMD_ERROR;
    00770         break;
    00771       }
    00772       _error_message = INVALID_STRING_ID;
    00773     } else {
    00774       total_cost.AddCost(ret);
    00775     }
    00776
    00777     if (tile == end_tile) break;
    00778
    00779     tile += ToTileIndexDiff(_trackdelta[trackdir]);
    00780
    00781     /* toggle railbit for the non-diagonal tracks */
    00782     if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
    00783   }
    00784
    00785   return (total_cost.GetCost() == 0) ? CommandCost(remove ? INVALID_STRING_ID : (_error_message == INVALID_STRING_ID ? STR_ERROR_ALREADY_BUILT : _error_message)) : total_cost;
    00786 }
    00787
    00801 CommandCost CmdBuildRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00802 {
    00803   return CmdRailTrackHelper(tile, flags, p1, ClrBit(p2, 7), text);
    00804 }
    00805
    00819 CommandCost CmdRemoveRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00820 {
    00821   return CmdRailTrackHelper(tile, flags, p1, SetBit(p2, 7), text);
    00822 }
    00823
    00835 CommandCost CmdBuildTrainDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00836 {
    00837   /* check railtype and valid direction for depot (0 through 3), 4 in total */
    00838   RailType railtype = Extract<RailType, 0, 4>(p1);
    00839   if (!ValParamRailtype(railtype)) return CMD_ERROR;
    00840
    00841   Slope tileh = GetTileSlope(tile, NULL);
    00842
    00843   DiagDirection dir = Extract<DiagDirection, 0, 2>(p2);
    00844
    00845   /* Prohibit construction if
    00846    * The tile is non-flat AND
    00847    * 1) build-on-slopes is disabled
    00848    * 2) the tile is steep i.e. spans two height levels
    00849    * 3) the exit points in the wrong direction
    00850    */
    00851
    00852   if (tileh != SLOPE_FLAT && (
    00853         !_settings_game.construction.build_on_slopes ||
    00854         IsSteepSlope(tileh) ||
    00855         !CanBuildDepotByTileh(dir, tileh)
    00856       )) {
    00857     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
    00858   }
    00859
    00860   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00861   if (cost.Failed()) return CMD_ERROR;
    00862
    00863   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
    00864
    00865   if (!Depot::CanAllocateItem()) return CMD_ERROR;
    00866
    00867   if (flags & DC_EXEC) {
    00868     Depot *d = new Depot(tile);
    00869     d->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
    00870
    00871     MakeRailDepot(tile, _current_company, d->index, dir, railtype);
    00872     MarkTileDirtyByTile(tile);
    00873
    00874     AddSideToSignalBuffer(tile, INVALID_DIAGDIR, _current_company);
    00875     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
    00876   }
    00877
    00878   cost.AddCost(_price[PR_BUILD_DEPOT_TRAIN]);
    00879   cost.AddCost(RailBuildCost(railtype));
    00880   return cost;
    00881 }
    00882
    00903 CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00904 {
    00905   Track track = Extract<Track, 0, 3>(p1);
    00906   bool ctrl_pressed = HasBit(p1, 3); // was the CTRL button pressed
    00907   SignalVariant sigvar = (ctrl_pressed ^ HasBit(p1, 4)) ? SIG_SEMAPHORE : SIG_ELECTRIC; // the signal variant of the new signal
    00908   SignalType sigtype = Extract<SignalType, 5, 3>(p1); // the signal type of the new signal
    00909   bool convert_signal = HasBit(p1, 8); // convert button pressed
    00910   SignalType cycle_start = Extract<SignalType, 9, 3>(p1);
    00911   SignalType cycle_stop = Extract<SignalType, 12, 3>(p1);
    00912   uint num_dir_cycle = GB(p1, 15, 2);
    00913
    00914   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
    00915   if (cycle_start > cycle_stop || cycle_stop > SIGTYPE_LAST) return CMD_ERROR;
    00916
    00917   /* You can only build signals on plain rail tiles, and the selected track must exist */
    00918   if (!ValParamTrackOrientation(track) || !IsPlainRailTile(tile) ||
    00919       !HasTrack(tile, track) || !EnsureNoTrainOnTrack(tile, track)) {
    00920     return CMD_ERROR;
    00921   }
    00922
    00923   /* Protect against invalid signal copying */
    00924   if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
    00925
    00926   if (!CheckTileOwnership(tile)) return CMD_ERROR;
    00927
    00928   {
    00929     /* See if this is a valid track combination for signals, (ie, no overlap) */
    00930     TrackBits trackbits = GetTrackBits(tile);
    00931     if (KillFirstBit(trackbits) != TRACK_BIT_NONE && // More than one track present
    00932         trackbits != TRACK_BIT_HORZ &&
    00933         trackbits != TRACK_BIT_VERT) {
    00934       return_cmd_error(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK);
    00935     }
    00936   }
    00937
    00938   /* In case we don't want to change an existing signal, return without error. */
    00939   if (HasBit(p1, 17) && HasSignalOnTrack(tile, track)) return CommandCost();
    00940
    00941   /* you can not convert a signal if no signal is on track */
    00942   if (convert_signal && !HasSignalOnTrack(tile, track)) return CMD_ERROR;
    00943
    00944   CommandCost cost;
    00945   if (!HasSignalOnTrack(tile, track)) {
    00946     /* build new signals */
    00947     cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS]);
    00948   } else {
    00949     if (p2 != 0 && sigvar != GetSignalVariant(tile, track)) {
    00950       /* convert signals <-> semaphores */
    00951       cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
    00952
    00953     } else if (convert_signal) {
    00954       /* convert button pressed */
    00955       if (ctrl_pressed || GetSignalVariant(tile, track) != sigvar) {
    00956         /* convert electric <-> semaphore */
    00957         cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
    00958       } else {
    00959         /* it is free to change signal type: normal-pre-exit-combo */
    00960         cost = CommandCost();
    00961       }
    00962
    00963     } else {
    00964       /* it is free to change orientation/pre-exit-combo signals */
    00965       cost = CommandCost();
    00966     }
    00967   }
    00968
    00969   if (flags & DC_EXEC) {
    00970     Train *v = NULL;
    00971     /* The new/changed signal could block our path. As this can lead to
    00972      * stale reservations, we clear the path reservation here and try
    00973      * to redo it later on. */
    00974     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
    00975       v = GetTrainForReservation(tile, track);
    00976       if (v != NULL) FreeTrainTrackReservation(v);
    00977     }
    00978
    00979     if (!HasSignals(tile)) {
    00980       /* there are no signals at all on this tile yet */
    00981       SetHasSignals(tile, true);
    00982       SetSignalStates(tile, 0xF); // all signals are on
    00983       SetPresentSignals(tile, 0); // no signals built by default
    00984       SetSignalType(tile, track, sigtype);
    00985       SetSignalVariant(tile, track, sigvar);
    00986     }
    00987
    00988     if (p2 == 0) {
    00989       if (!HasSignalOnTrack(tile, track)) {
    00990         /* build new signals */
    00991         SetPresentSignals(tile, GetPresentSignals(tile) | (IsPbsSignal(sigtype) ? KillFirstBit(SignalOnTrack(track)) : SignalOnTrack(track)));
    00992         SetSignalType(tile, track, sigtype);
    00993         SetSignalVariant(tile, track, sigvar);
    00994         while (num_dir_cycle-- > 0) CycleSignalSide(tile, track);
    00995       } else {
    00996         if (convert_signal) {
    00997           /* convert signal button pressed */
    00998           if (ctrl_pressed) {
    00999             /* toggle the pressent signal variant: SIG_ELECTRIC <-> SIG_SEMAPHORE */
    01000             SetSignalVariant(tile, track, (GetSignalVariant(tile, track) == SIG_ELECTRIC) ? SIG_SEMAPHORE : SIG_ELECTRIC);
    01001             /* Query current signal type so the check for PBS signals below works. */
    01002             sigtype = GetSignalType(tile, track);
    01003           } else {
    01004             /* convert the present signal to the chosen type and variant */
    01005             SetSignalType(tile, track, sigtype);
    01006             SetSignalVariant(tile, track, sigvar);
    01007             if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
    01008               SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
    01009             }
    01010           }
    01011
    01012         } else if (ctrl_pressed) {
    01013           /* cycle between cycle_start and cycle_end */
    01014           sigtype = (SignalType)(GetSignalType(tile, track) + 1);
    01015
    01016           if (sigtype < cycle_start || sigtype > cycle_stop) sigtype = cycle_start;
    01017
    01018           SetSignalType(tile, track, sigtype);
    01019           if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
    01020             SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
    01021           }
    01022         } else {
    01023           /* cycle the signal side: both -> left -> right -> both -> ... */
    01024           CycleSignalSide(tile, track);
    01025           /* Query current signal type so the check for PBS signals below works. */
    01026           sigtype = GetSignalType(tile, track);
    01027         }
    01028       }
    01029     } else {
    01030       /* If CmdBuildManySignals is called with copying signals, just copy the
    01031        * direction of the first signal given as parameter by CmdBuildManySignals */
    01032       SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | (p2 & SignalOnTrack(track)));
    01033       SetSignalVariant(tile, track, sigvar);
    01034       SetSignalType(tile, track, sigtype);
    01035     }
    01036
    01037     if (IsPbsSignal(sigtype)) {
    01038       /* PBS signals should show red unless they are on a reservation. */
    01039       uint mask = GetPresentSignals(tile) & SignalOnTrack(track);
    01040       SetSignalStates(tile, (GetSignalStates(tile) & ~mask) | ((HasBit(GetRailReservationTrackBits(tile), track) ? UINT_MAX : 0) & mask));
    01041     }
    01042     MarkTileDirtyByTile(tile);
    01043     AddTrackToSignalBuffer(tile, track, _current_company);
    01044     YapfNotifyTrackLayoutChange(tile, track);
    01045     if (v != NULL) {
    01046       /* Extend the train's path if it's not stopped or loading, or not at a safe position. */
    01047       if (!(((v->vehstatus & VS_STOPPED) && v->cur_speed == 0) || v->current_order.IsType(OT_LOADING)) ||
    01048           !IsSafeWaitingPosition(v, v->tile, v->GetVehicleTrackdir(), true, _settings_game.pf.forbid_90_deg)) {
    01049         TryPathReserve(v, true);
    01050       }
    01051     }
    01052   }
    01053
    01054   return cost;
    01055 }
    01056
    01057 static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
    01058 {
    01059   tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
    01060   if (tile == INVALID_TILE) return false;
    01061
    01062   /* Check for track bits on the new tile */
    01063   TrackdirBits trackdirbits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
    01064
    01065   if (TracksOverlap(TrackdirBitsToTrackBits(trackdirbits))) return false;
    01066   trackdirbits &= TrackdirReachesTrackdirs(trackdir);
    01067
    01068   /* No track bits, must stop */
    01069   if (trackdirbits == TRACKDIR_BIT_NONE) return false;
    01070
    01071   /* Get the first track dir */
    01072   trackdir = RemoveFirstTrackdir(&trackdirbits);
    01073
    01074   /* Any left? It's a junction so we stop */
    01075   if (trackdirbits != TRACKDIR_BIT_NONE) return false;
    01076
    01077   switch (GetTileType(tile)) {
    01078     case MP_RAILWAY:
    01079       if (IsRailDepot(tile)) return false;
    01080       if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
    01081       signal_ctr++;
    01082       if (IsDiagonalTrackdir(trackdir)) {
    01083         signal_ctr++;
    01084         /* Ensure signal_ctr even so X and Y pieces get signals */
    01085         ClrBit(signal_ctr, 0);
    01086       }
    01087       return true;
    01088
    01089     case MP_ROAD:
    01090       if (!IsLevelCrossing(tile)) return false;
    01091       signal_ctr += 2;
    01092       return true;
    01093
    01094     case MP_TUNNELBRIDGE: {
    01095       TileIndex orig_tile = tile; // backup old value
    01096
    01097       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
    01098       if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
    01099
    01100       /* Skip to end of tunnel or bridge
    01101        * note that tile is a parameter by reference, so it must be updated */
    01102       tile = GetOtherTunnelBridgeEnd(tile);
    01103
    01104       signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
    01105       return true;
    01106     }
    01107
    01108     default: return false;
    01109   }
    01110 }
    01111
    01127 static CommandCost CmdSignalTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01128 {
    01129   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
    01130   bool err = true;
    01131   TileIndex start_tile = tile;
    01132
    01133   Track track = Extract<Track, 0, 3>(p2);
    01134   bool mode = HasBit(p2, 3);
    01135   bool semaphores = HasBit(p2, 4);
    01136   bool remove = HasBit(p2, 5);
    01137   bool autofill = HasBit(p2, 6);
    01138   byte signal_density = GB(p2, 24, 8);
    01139
    01140   if (p1 >= MapSize() || !ValParamTrackOrientation(track)) return CMD_ERROR;
    01141   TileIndex end_tile = p1;
    01142   if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
    01143
    01144   if (!IsPlainRailTile(tile)) return CMD_ERROR;
    01145
    01146   /* for vertical/horizontal tracks, double the given signals density
    01147    * since the original amount will be too dense (shorter tracks) */
    01148   signal_density *= 2;
    01149
    01150   Trackdir trackdir = TrackToTrackdir(track);
    01151   if (ValidateAutoDrag(&trackdir, tile, end_tile).Failed()) return CMD_ERROR;
    01152
    01153   track = TrackdirToTrack(trackdir); // trackdir might have changed, keep track in sync
    01154   Trackdir start_trackdir = trackdir;
    01155
    01156   /* Must start on a valid track to be able to avoid loops */
    01157   if (!HasTrack(tile, track)) return CMD_ERROR;
    01158
    01159   SignalType sigtype = (SignalType)GB(p2, 7, 3);
    01160   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
    01161
    01162   byte signals;
    01163   /* copy the signal-style of the first rail-piece if existing */
    01164   if (HasSignalOnTrack(tile, track)) {
    01165     signals = GetPresentSignals(tile) & SignalOnTrack(track);
    01166     assert(signals != 0);
    01167
    01168     /* copy signal/semaphores style (independent of CTRL) */
    01169     semaphores = GetSignalVariant(tile, track) != SIG_ELECTRIC;
    01170
    01171     sigtype = GetSignalType(tile, track);
    01172     /* Don't but copy pre-signal type */
    01173     if (sigtype < SIGTYPE_PBS) sigtype = SIGTYPE_NORMAL;
    01174   } else { // no signals exist, drag a two-way signal stretch
    01175     signals = IsPbsSignal(sigtype) ? SignalAlongTrackdir(trackdir) : SignalOnTrack(track);
    01176   }
    01177
    01178   byte signal_dir = 0;
    01179   if (signals & SignalAlongTrackdir(trackdir))   SetBit(signal_dir, 0);
    01180   if (signals & SignalAgainstTrackdir(trackdir)) SetBit(signal_dir, 1);
    01181
    01182   /* signal_ctr         - amount of tiles already processed
    01183    * signals_density    - setting to put signal on every Nth tile (double space on |, -- tracks)
    01184    **********
    01185    * trackdir   - trackdir to build with autorail
    01186    * semaphores - semaphores or signals
    01187    * signals    - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
    01188    *              and convert all others to semaphore/signal
    01189    * remove     - 1 remove signals, 0 build signals */
    01190   int signal_ctr = 0;
    01191   for (;;) {
    01192     /* only build/remove signals with the specified density */
    01193     if ((remove && autofill) || signal_ctr % signal_density == 0) {
    01194       uint32 p1 = GB(TrackdirToTrack(trackdir), 0, 3);
    01195       SB(p1, 3, 1, mode);
    01196       SB(p1, 4, 1, semaphores);
    01197       SB(p1, 5, 3, sigtype);
    01198       if (!remove && signal_ctr == 0) SetBit(p1, 17);
    01199
    01200       /* Pick the correct orientation for the track direction */
    01201       signals = 0;
    01202       if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
    01203       if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
    01204
    01205       ret = DoCommand(tile, p1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
    01206
    01207       /* Be user-friendly and try placing signals as much as possible */
    01208       if (ret.Succeeded()) {
    01209         err = false;
    01210         total_cost.AddCost(ret);
    01211       }
    01212     }
    01213
    01214     if (autofill) {
    01215       if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
    01216
    01217       /* Prevent possible loops */
    01218       if (tile == start_tile && trackdir == start_trackdir) break;
    01219     } else {
    01220       if (tile == end_tile) break;
    01221
    01222       tile += ToTileIndexDiff(_trackdelta[trackdir]);
    01223       signal_ctr++;
    01224
    01225       /* toggle railbit for the non-diagonal tracks (|, -- tracks) */
    01226       if (IsDiagonalTrackdir(trackdir)) {
    01227         signal_ctr++;
    01228       } else {
    01229         ToggleBit(trackdir, 0);
    01230       }
    01231     }
    01232   }
    01233
    01234   return err ? CMD_ERROR : total_cost;
    01235 }
    01236
    01254 CommandCost CmdBuildSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01255 {
    01256   return CmdSignalTrackHelper(tile, flags, p1, p2, text);
    01257 }
    01258
    01270 CommandCost CmdRemoveSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01271 {
    01272   Track track = Extract<Track, 0, 3>(p1);
    01273
    01274   if (!ValParamTrackOrientation(track) ||
    01275       !IsPlainRailTile(tile) ||
    01276       !HasTrack(tile, track) ||
    01277       !EnsureNoTrainOnTrack(tile, track) ||
    01278       !HasSignalOnTrack(tile, track)) {
    01279     return CMD_ERROR;
    01280   }
    01281
    01282   /* Only water can remove signals from anyone */
    01283   if (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) return CMD_ERROR;
    01284
    01285   /* Do it? */
    01286   if (flags & DC_EXEC) {
    01287     Train *v = NULL;
    01288     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
    01289       v = GetTrainForReservation(tile, track);
    01290     } else if (IsPbsSignal(GetSignalType(tile, track))) {
    01291       /* PBS signal, might be the end of a path reservation. */
    01292       Trackdir td = TrackToTrackdir(track);
    01293       for (int i = 0; v == NULL && i < 2; i++, td = ReverseTrackdir(td)) {
    01294         /* Only test the active signal side. */
    01295         if (!HasSignalOnTrackdir(tile, ReverseTrackdir(td))) continue;
    01296         TileIndex next = TileAddByDiagDir(tile, TrackdirToExitdir(td));
    01297         TrackBits tracks = TrackdirBitsToTrackBits(TrackdirReachesTrackdirs(td));
    01298         if (HasReservedTracks(next, tracks)) {
    01299           v = GetTrainForReservation(next, TrackBitsToTrack(GetReservedTrackbits(next) & tracks));
    01300         }
    01301       }
    01302     }
    01303     SetPresentSignals(tile, GetPresentSignals(tile) & ~SignalOnTrack(track));
    01304
    01305     /* removed last signal from tile? */
    01306     if (GetPresentSignals(tile) == 0) {
    01307       SetSignalStates(tile, 0);
    01308       SetHasSignals(tile, false);
    01309       SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
    01310     }
    01311
    01312     AddTrackToSignalBuffer(tile, track, GetTileOwner(tile));
    01313     YapfNotifyTrackLayoutChange(tile, track);
    01314     if (v != NULL) TryPathReserve(v, false);
    01315
    01316     MarkTileDirtyByTile(tile);
    01317   }
    01318
    01319   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_SIGNALS]);
    01320 }
    01321
    01339 CommandCost CmdRemoveSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01340 {
    01341   return CmdSignalTrackHelper(tile, flags, p1, SetBit(p2, 5), text); // bit 5 is remove bit
    01342 }
    01343
    01345 static Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
    01346 {
    01347   if (v->type != VEH_TRAIN) return NULL;
    01348
    01349   TrainList *affected_trains = static_cast<TrainList*>(data);
    01350   affected_trains->Include(Train::From(v)->First());
    01351
    01352   return NULL;
    01353 }
    01354
    01364 CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01365 {
    01366   CommandCost cost(EXPENSES_CONSTRUCTION);
    01367   RailType totype = Extract<RailType, 0, 4>(p2);
    01368
    01369   if (!ValParamRailtype(totype)) return CMD_ERROR;
    01370   if (p1 >= MapSize()) return CMD_ERROR;
    01371
    01372   uint ex = TileX(tile);
    01373   uint ey = TileY(tile);
    01374   uint sx = TileX(p1);
    01375   uint sy = TileY(p1);
    01376
    01377   /* make sure sx,sy are smaller than ex,ey */
    01378   if (ex < sx) Swap(ex, sx);
    01379   if (ey < sy) Swap(ey, sy);
    01380
    01381   _error_message = STR_ERROR_NO_SUITABLE_RAILROAD_TRACK; // by default, there is no track to convert
    01382   TrainList affected_trains;
    01383
    01384   for (uint x = sx; x <= ex; ++x) {
    01385     for (uint y = sy; y <= ey; ++y) {
    01386       TileIndex tile = TileXY(x, y);
    01387       TileType tt = GetTileType(tile);
    01388
    01389       /* Check if there is any track on tile */
    01390       switch (tt) {
    01391         case MP_RAILWAY:
    01392           break;
    01393         case MP_STATION:
    01394           if (!HasStationRail(tile)) continue;
    01395           break;
    01396         case MP_ROAD:
    01397           if (!IsLevelCrossing(tile)) continue;
    01398           if (RailNoLevelCrossings(totype)) {
    01399             _error_message = STR_ERROR_CROSSING_DISALLOWED;
    01400             continue;
    01401           }
    01402           break;
    01403         case MP_TUNNELBRIDGE:
    01404           if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
    01405           break;
    01406         default: continue;
    01407       }
    01408
    01409       /* Original railtype we are converting from */
    01410       RailType type = GetRailType(tile);
    01411
    01412       /* Converting to the same type or converting 'hidden' elrail -> rail */
    01413       if (type == totype || (_settings_game.vehicle.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
    01414
    01415       /* Trying to convert other's rail */
    01416       if (!CheckTileOwnership(tile)) continue;
    01417
    01418       SmallVector<Train *, 2> vehicles_affected;
    01419
    01420       /* Vehicle on the tile when not converting Rail <-> ElRail
    01421        * Tunnels and bridges have special check later */
    01422       if (tt != MP_TUNNELBRIDGE) {
    01423         if (!IsCompatibleRail(type, totype) && !EnsureNoVehicleOnGround(tile)) continue;
    01424         if (flags & DC_EXEC) { // we can safely convert, too
    01425           TrackBits reserved = GetReservedTrackbits(tile);
    01426           Track     track;
    01427           while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
    01428             Train *v = GetTrainForReservation(tile, track);
    01429             if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
    01430               /* No power on new rail type, reroute. */
    01431               FreeTrainTrackReservation(v);
    01432               *vehicles_affected.Append() = v;
    01433             }
    01434           }
    01435
    01436           SetRailType(tile, totype);
    01437           MarkTileDirtyByTile(tile);
    01438           /* update power of train on this tile */
    01439           FindVehicleOnPos(tile, &affected_trains, &UpdateTrainPowerProc);
    01440         }
    01441       }
    01442
    01443       switch (tt) {
    01444         case MP_RAILWAY:
    01445           switch (GetRailTileType(tile)) {
    01446             case RAIL_TILE_DEPOT:
    01447               if (flags & DC_EXEC) {
    01448                 /* notify YAPF about the track layout change */
    01449                 YapfNotifyTrackLayoutChange(tile, GetRailDepotTrack(tile));
    01450
    01451                 /* Update build vehicle window related to this depot */
    01452                 InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
    01453                 InvalidateWindowData(WC_BUILD_VEHICLE, tile);
    01454               }
    01455               cost.AddCost(RailConvertCost(type, totype));
    01456               break;
    01457
    01458             default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
    01459               if (flags & DC_EXEC) {
    01460                 /* notify YAPF about the track layout change */
    01461                 TrackBits tracks = GetTrackBits(tile);
    01462                 while (tracks != TRACK_BIT_NONE) {
    01463                   YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
    01464                 }
    01465               }
    01466               cost.AddCost(RailConvertCost(type, totype) * CountBits(GetTrackBits(tile)));
    01467               break;
    01468           }
    01469           break;
    01470
    01471         case MP_TUNNELBRIDGE: {
    01472           TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
    01473
    01474           /* If both ends of tunnel/bridge are in the range, do not try to convert twice -
    01475            * it would cause assert because of different test and exec runs */
    01476           if (endtile < tile && TileX(endtile) >= sx && TileX(endtile) <= ex &&
    01477               TileY(endtile) >= sy && TileY(endtile) <= ey) continue;
    01478
    01479           /* When not coverting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
    01480           if (!IsCompatibleRail(GetRailType(tile), totype) &&
    01481               HasVehicleOnTunnelBridge(tile, endtile)) continue;
    01482
    01483           if (flags & DC_EXEC) {
    01484             Track track = DiagDirToDiagTrack(GetTunnelBridgeDirection(tile));
    01485             if (HasTunnelBridgeReservation(tile)) {
    01486               Train *v = GetTrainForReservation(tile, track);
    01487               if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
    01488                 /* No power on new rail type, reroute. */
    01489                 FreeTrainTrackReservation(v);
    01490                 *vehicles_affected.Append() = v;
    01491               }
    01492             }
    01493             SetRailType(tile, totype);
    01494             SetRailType(endtile, totype);
    01495
    01496             FindVehicleOnPos(tile, &affected_trains, &UpdateTrainPowerProc);
    01497             FindVehicleOnPos(endtile, &affected_trains, &UpdateTrainPowerProc);
    01498
    01499             YapfNotifyTrackLayoutChange(tile, track);
    01500             YapfNotifyTrackLayoutChange(endtile, track);
    01501
    01502             MarkTileDirtyByTile(tile);
    01503             MarkTileDirtyByTile(endtile);
    01504
    01505             if (IsBridge(tile)) {
    01506               TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
    01507               TileIndex t = tile + delta;
    01508               for (; t != endtile; t += delta) MarkTileDirtyByTile(t); // TODO encapsulate this into a function
    01509             }
    01510           }
    01511
    01512           cost.AddCost((GetTunnelBridgeLength(tile, endtile) + 2) * RailConvertCost(type, totype));
    01513         } break;
    01514
    01515         default: // MP_STATION, MP_ROAD
    01516           if (flags & DC_EXEC) {
    01517             Track track = ((tt == MP_STATION) ? GetRailStationTrack(tile) : GetCrossingRailTrack(tile));
    01518             YapfNotifyTrackLayoutChange(tile, track);
    01519           }
    01520
    01521           cost.AddCost(RailConvertCost(type, totype));
    01522           break;
    01523       }
    01524
    01525       for (uint i = 0; i < vehicles_affected.Length(); ++i) {
    01526         TryPathReserve(vehicles_affected[i], true);
    01527       }
    01528     }
    01529   }
    01530
    01531   if (flags & DC_EXEC) {
    01532     /* Railtype changed, update trains as when entering different track */
    01533     for (Train **v = affected_trains.Begin(); v != affected_trains.End(); v++) {
    01534       (*v)->RailtypeChanged();
    01535     }
    01536   }
    01537
    01538   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
    01539 }
    01540
    01541 static CommandCost RemoveTrainDepot(TileIndex tile, DoCommandFlag flags)
    01542 {
    01543   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER)
    01544     return CMD_ERROR;
    01545
    01546   if (!EnsureNoVehicleOnGround(tile))
    01547     return CMD_ERROR;
    01548
    01549   if (flags & DC_EXEC) {
    01550     /* read variables before the depot is removed */
    01551     DiagDirection dir = GetRailDepotDirection(tile);
    01552     Owner owner = GetTileOwner(tile);
    01553     Train *v = NULL;
    01554
    01555     if (HasDepotReservation(tile)) {
    01556       v = GetTrainForReservation(tile, DiagDirToDiagTrack(dir));
    01557       if (v != NULL) FreeTrainTrackReservation(v);
    01558     }
    01559
    01560     delete Depot::GetByTile(tile);
    01561     DoClearSquare(tile);
    01562     AddSideToSignalBuffer(tile, dir, owner);
    01563     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
    01564     if (v != NULL) TryPathReserve(v, true);
    01565   }
    01566
    01567   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_TRAIN]);
    01568 }
    01569
    01570 static CommandCost ClearTile_Track(TileIndex tile, DoCommandFlag flags)
    01571 {
    01572   CommandCost cost(EXPENSES_CONSTRUCTION);
    01573
    01574   if (flags & DC_AUTO) {
    01575     if (!IsTileOwner(tile, _current_company)) {
    01576       return_cmd_error(STR_ERROR_AREA_IS_OWNED_BY_ANOTHER);
    01577     }
    01578
    01579     if (IsPlainRail(tile)) {
    01580       return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
    01581     } else {
    01582       return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
    01583     }
    01584   }
    01585
    01586   switch (GetRailTileType(tile)) {
    01587     case RAIL_TILE_SIGNALS:
    01588     case RAIL_TILE_NORMAL: {
    01589       Slope tileh = GetTileSlope(tile, NULL);
    01590       /* Is there flat water on the lower halftile, that gets cleared expensively? */
    01591       bool water_ground = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh));
    01592
    01593       TrackBits tracks = GetTrackBits(tile);
    01594       while (tracks != TRACK_BIT_NONE) {
    01595         Track track = RemoveFirstTrack(&tracks);
    01596         CommandCost ret = DoCommand(tile, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
    01597         if (ret.Failed()) return CMD_ERROR;
    01598         cost.AddCost(ret);
    01599       }
    01600
    01601       /* when bankrupting, don't make water dirty, there could be a ship on lower halftile */
    01602       if (water_ground && !(flags & DC_BANKRUPT)) {
    01603         if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    01604
    01605         /* The track was removed, and left a coast tile. Now also clear the water. */
    01606         if (flags & DC_EXEC) DoClearSquare(tile);
    01607         cost.AddCost(_price[PR_CLEAR_WATER]);
    01608       }
    01609
    01610       return cost;
    01611     }
    01612
    01613     case RAIL_TILE_DEPOT:
    01614       return RemoveTrainDepot(tile, flags);
    01615
    01616     default:
    01617       return CMD_ERROR;
    01618   }
    01619 }
    01620
    01625 static uint GetSaveSlopeZ(uint x, uint y, Track track)
    01626 {
    01627   switch (track) {
    01628     case TRACK_UPPER: x &= ~0xF; y &= ~0xF; break;
    01629     case TRACK_LOWER: x |=  0xF; y |=  0xF; break;
    01630     case TRACK_LEFT:  x |=  0xF; y &= ~0xF; break;
    01631     case TRACK_RIGHT: x &= ~0xF; y |=  0xF; break;
    01632     default: break;
    01633   }
    01634   return GetSlopeZ(x, y);
    01635 }
    01636
    01637 static void DrawSingleSignal(TileIndex tile, Track track, byte condition, uint image, uint pos)
    01638 {
    01639   bool side = (_settings_game.vehicle.road_side != 0) && _settings_game.construction.signal_side;
    01640   static const Point SignalPositions[2][12] = {
    01641     { // Signals on the left side
    01642     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01643       { 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
    01644     /*  LOWER     LOWER     X         X         Y         Y     */
    01645       {11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
    01646     }, { // Signals on the right side
    01647     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01648       {14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
    01649     /*  LOWER     LOWER     X         X         Y         Y     */
    01650       {14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
    01651     }
    01652   };
    01653
    01654   uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
    01655   uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
    01656
    01657   SpriteID sprite;
    01658
    01659   SignalType type       = GetSignalType(tile, track);
    01660   SignalVariant variant = GetSignalVariant(tile, track);
    01661
    01662   if (type == SIGTYPE_NORMAL && variant == SIG_ELECTRIC) {
    01663     /* Normal electric signals are picked from original sprites. */
    01664     sprite = SPR_ORIGINAL_SIGNALS_BASE + image + condition;
    01665   } else {
    01666     /* All other signals are picked from add on sprites. */
    01667     sprite = SPR_SIGNALS_BASE + (type - 1) * 16 + variant * 64 + image + condition + (type > SIGTYPE_LAST_NOPBS ? 64 : 0);
    01668   }
    01669
    01670   AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, GetSaveSlopeZ(x, y, track));
    01671 }
    01672
    01673 static uint32 _drawtile_track_palette;
    01674
    01675
    01676 static void DrawTrackFence_NW(const TileInfo *ti, SpriteID base_image)
    01677 {
    01678   RailFenceOffset rfo = RFO_FLAT_X;
    01679   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
    01680   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01681     ti->x, ti->y + 1, 16, 1, 4, ti->z);
    01682 }
    01683
    01684 static void DrawTrackFence_SE(const TileInfo *ti, SpriteID base_image)
    01685 {
    01686   RailFenceOffset rfo = RFO_FLAT_X;
    01687   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
    01688   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01689     ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
    01690 }
    01691
    01692 static void DrawTrackFence_NW_SE(const TileInfo *ti, SpriteID base_image)
    01693 {
    01694   DrawTrackFence_NW(ti, base_image);
    01695   DrawTrackFence_SE(ti, base_image);
    01696 }
    01697
    01698 static void DrawTrackFence_NE(const TileInfo *ti, SpriteID base_image)
    01699 {
    01700   RailFenceOffset rfo = RFO_FLAT_Y;
    01701   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
    01702   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01703     ti->x + 1, ti->y, 1, 16, 4, ti->z);
    01704 }
    01705
    01706 static void DrawTrackFence_SW(const TileInfo *ti, SpriteID base_image)
    01707 {
    01708   RailFenceOffset rfo = RFO_FLAT_Y;
    01709   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
    01710   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01711     ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
    01712 }
    01713
    01714 static void DrawTrackFence_NE_SW(const TileInfo *ti, SpriteID base_image)
    01715 {
    01716   DrawTrackFence_NE(ti, base_image);
    01717   DrawTrackFence_SW(ti, base_image);
    01718 }
    01719
    01723 static void DrawTrackFence_NS_1(const TileInfo *ti, SpriteID base_image)
    01724 {
    01725   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_W);
    01726   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
    01727     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01728 }
    01729
    01733 static void DrawTrackFence_NS_2(const TileInfo *ti, SpriteID base_image)
    01734 {
    01735   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_E);
    01736   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
    01737     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01738 }
    01739
    01743 static void DrawTrackFence_WE_1(const TileInfo *ti, SpriteID base_image)
    01744 {
    01745   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_N);
    01746   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
    01747     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01748 }
    01749
    01753 static void DrawTrackFence_WE_2(const TileInfo *ti, SpriteID base_image)
    01754 {
    01755   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_S);
    01756   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
    01757     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01758 }
    01759
    01760
    01761 static void DrawTrackDetails(const TileInfo *ti, const RailtypeInfo *rti)
    01762 {
    01763   /* Base sprite for track fences.
    01764    * Note: Halftile slopes only have fences on the upper part. */
    01765   SpriteID base_image = GetCustomRailSprite(rti, ti->tile, RTSG_FENCES, IsHalftileSlope(ti->tileh) ? TCX_UPPER_HALFTILE : TCX_NORMAL);
    01766   if (base_image == 0) base_image = SPR_TRACK_FENCE_FLAT_X;
    01767
    01768   switch (GetRailGroundType(ti->tile)) {
    01769     case RAIL_GROUND_FENCE_NW:     DrawTrackFence_NW(ti, base_image);    break;
    01770     case RAIL_GROUND_FENCE_SE:     DrawTrackFence_SE(ti, base_image);    break;
    01771     case RAIL_GROUND_FENCE_SENW:   DrawTrackFence_NW_SE(ti, base_image); break;
    01772     case RAIL_GROUND_FENCE_NE:     DrawTrackFence_NE(ti, base_image);    break;
    01773     case RAIL_GROUND_FENCE_SW:     DrawTrackFence_SW(ti, base_image);    break;
    01774     case RAIL_GROUND_FENCE_NESW:   DrawTrackFence_NE_SW(ti, base_image); break;
    01775     case RAIL_GROUND_FENCE_VERT1:  DrawTrackFence_NS_1(ti, base_image);  break;
    01776     case RAIL_GROUND_FENCE_VERT2:  DrawTrackFence_NS_2(ti, base_image);  break;
    01777     case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti, base_image);  break;
    01778     case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti, base_image);  break;
    01779     case RAIL_GROUND_WATER: {
    01780       Corner track_corner;
    01781       if (IsHalftileSlope(ti->tileh)) {
    01782         /* Steep slope or one-corner-raised slope with halftile foundation */
    01783         track_corner = GetHalftileSlopeCorner(ti->tileh);
    01784       } else {
    01785         /* Three-corner-raised slope */
    01786         track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    01787       }
    01788       switch (track_corner) {
    01789         case CORNER_W: DrawTrackFence_NS_1(ti, base_image); break;
    01790         case CORNER_S: DrawTrackFence_WE_2(ti, base_image); break;
    01791         case CORNER_E: DrawTrackFence_NS_2(ti, base_image); break;
    01792         case CORNER_N: DrawTrackFence_WE_1(ti, base_image); break;
    01793         default: NOT_REACHED();
    01794       }
    01795       break;
    01796     }
    01797     default: break;
    01798   }
    01799 }
    01800
    01801 /* SubSprite for drawing the track halftile of 'three-corners-raised'-sloped rail sprites. */
    01802 static const int INF = 1000; // big number compared to tilesprite size
    01803 static const SubSprite _halftile_sub_sprite[4] = {
    01804   { -INF    , -INF  , 32 - 33, INF     }, // CORNER_W, clip 33 pixels from right
    01805   { -INF    ,  0 + 7, INF    , INF     }, // CORNER_S, clip 7 pixels from top
    01806   { -31 + 33, -INF  , INF    , INF     }, // CORNER_E, clip 33 pixels from left
    01807   { -INF    , -INF  , INF    , 30 - 23 }  // CORNER_N, clip 23 pixels from bottom
    01808 };
    01809
    01810 static inline void DrawTrackSprite(SpriteID sprite, PaletteID pal, const TileInfo *ti, Slope s)
    01811 {
    01812   DrawGroundSprite(sprite, pal, NULL, 0, (ti->tileh & s) ? -8 : 0);
    01813 }
    01814
    01815 static void DrawTrackBitsOverlay(TileInfo *ti, TrackBits track, const RailtypeInfo *rti)
    01816 {
    01817   RailGroundType rgt = GetRailGroundType(ti->tile);
    01818   Foundation f = GetRailFoundation(ti->tileh, track);
    01819   Corner halftile_corner = CORNER_INVALID;
    01820
    01821   if (IsNonContinuousFoundation(f)) {
    01822     /* Save halftile corner */
    01823     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
    01824     /* Draw lower part first */
    01825     track &= ~CornerToTrackBits(halftile_corner);
    01826     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
    01827   }
    01828
    01829   DrawFoundation(ti, f);
    01830   /* DrawFoundation modifies ti */
    01831
    01832   /* Draw ground */
    01833   if (track == TRACK_BIT_NONE && rgt == RAIL_GROUND_WATER) {
    01834     if (IsSteepSlope(ti->tileh)) {
    01835       DrawShoreTile(ti->tileh);
    01836     } else {
    01837       DrawGroundSprite(SPR_FLAT_WATER_TILE, PAL_NONE);
    01838     }
    01839   } else {
    01840     SpriteID image;
    01841
    01842     switch (rgt) {
    01843       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01844       case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
    01845       default:                     image = SPR_FLAT_GRASS_TILE; break;
    01846     }
    01847
    01848     image += _tileh_to_sprite[ti->tileh];
    01849
    01850     DrawGroundSprite(image, PAL_NONE);
    01851   }
    01852
    01853   SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
    01854   SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
    01855   TrackBits pbs = _settings_client.gui.show_track_reservation ? GetRailReservationTrackBits(ti->tile) : TRACK_BIT_NONE;
    01856
    01857   if (track == TRACK_BIT_NONE) {
    01858     /* Half-tile foundation, no track here? */
    01859   } else if (ti->tileh == SLOPE_NW && track == TRACK_BIT_Y) {
    01860     DrawGroundSprite(ground + RTO_SLOPE_NW, PAL_NONE);
    01861     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 9, PALETTE_CRASH);
    01862   } else if (ti->tileh == SLOPE_NE && track == TRACK_BIT_X) {
    01863     DrawGroundSprite(ground + RTO_SLOPE_NE, PAL_NONE);
    01864     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 6, PALETTE_CRASH);
    01865   } else if (ti->tileh == SLOPE_SE && track == TRACK_BIT_Y) {
    01866     DrawGroundSprite(ground + RTO_SLOPE_SE, PAL_NONE);
    01867     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 7, PALETTE_CRASH);
    01868   } else if (ti->tileh == SLOPE_SW && track == TRACK_BIT_X) {
    01869     DrawGroundSprite(ground + RTO_SLOPE_SW, PAL_NONE);
    01870     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 8, PALETTE_CRASH);
    01871   } else {
    01872     switch (track) {
    01873       /* Draw single ground sprite when not overlapping. No track overlay
    01874        * is necessary for these sprites. */
    01875       case TRACK_BIT_X:     DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
    01876       case TRACK_BIT_Y:     DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
    01877       case TRACK_BIT_UPPER: DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N); break;
    01878       case TRACK_BIT_LOWER: DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
    01879       case TRACK_BIT_RIGHT: DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E); break;
    01880       case TRACK_BIT_LEFT:  DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
    01881       case TRACK_BIT_CROSS: DrawGroundSprite(ground + RTO_CROSSING_XY, PAL_NONE); break;
    01882       case TRACK_BIT_HORZ:  DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N);
    01883                             DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
    01884       case TRACK_BIT_VERT:  DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E);
    01885                             DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
    01886
    01887       default:
    01888         /* We're drawing a junction tile */
    01889         if ((track & TRACK_BIT_3WAY_NE) == 0) {
    01890           DrawGroundSprite(ground + RTO_JUNCTION_SW, PAL_NONE);
    01891         } else if ((track & TRACK_BIT_3WAY_SW) == 0) {
    01892           DrawGroundSprite(ground + RTO_JUNCTION_NE, PAL_NONE);
    01893         } else if ((track & TRACK_BIT_3WAY_NW) == 0) {
    01894           DrawGroundSprite(ground + RTO_JUNCTION_SE, PAL_NONE);
    01895         } else if ((track & TRACK_BIT_3WAY_SE) == 0) {
    01896           DrawGroundSprite(ground + RTO_JUNCTION_NW, PAL_NONE);
    01897         } else {
    01898           DrawGroundSprite(ground + RTO_JUNCTION_NSEW, PAL_NONE);
    01899         }
    01900
    01901         /* Mask out PBS bits as we shall draw them afterwards anyway. */
    01902         track &= ~pbs;
    01903
    01904         /* Draw regular track bits */
    01905         if (track & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PAL_NONE);
    01906         if (track & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PAL_NONE);
    01907         if (track & TRACK_BIT_UPPER) DrawGroundSprite(overlay + RTO_N, PAL_NONE);
    01908         if (track & TRACK_BIT_LOWER) DrawGroundSprite(overlay + RTO_S, PAL_NONE);
    01909         if (track & TRACK_BIT_RIGHT) DrawGroundSprite(overlay + RTO_E, PAL_NONE);
    01910         if (track & TRACK_BIT_LEFT)  DrawGroundSprite(overlay + RTO_W, PAL_NONE);
    01911     }
    01912
    01913     /* Draw reserved track bits */
    01914     if (pbs & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH);
    01915     if (pbs & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH);
    01916     if (pbs & TRACK_BIT_UPPER) DrawTrackSprite(overlay + RTO_N, PALETTE_CRASH, ti, SLOPE_N);
    01917     if (pbs & TRACK_BIT_LOWER) DrawTrackSprite(overlay + RTO_S, PALETTE_CRASH, ti, SLOPE_S);
    01918     if (pbs & TRACK_BIT_RIGHT) DrawTrackSprite(overlay + RTO_E, PALETTE_CRASH, ti, SLOPE_E);
    01919     if (pbs & TRACK_BIT_LEFT)  DrawTrackSprite(overlay + RTO_W, PALETTE_CRASH, ti, SLOPE_W);
    01920   }
    01921
    01922   if (IsValidCorner(halftile_corner)) {
    01923     DrawFoundation(ti, HalftileFoundation(halftile_corner));
    01924     overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY, TCX_UPPER_HALFTILE);
    01925     ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND, TCX_UPPER_HALFTILE);
    01926
    01927     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
    01928     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    01929
    01930     SpriteID image;
    01931     switch (rgt) {
    01932       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01933       case RAIL_GROUND_ICE_DESERT:
    01934       case RAIL_GROUND_HALF_SNOW:  image = SPR_FLAT_SNOW_DESERT_TILE; break;
    01935       default:                     image = SPR_FLAT_GRASS_TILE; break;
    01936     }
    01937
    01938     image += _tileh_to_sprite[fake_slope];
    01939
    01940     DrawGroundSprite(image, PAL_NONE, &(_halftile_sub_sprite[halftile_corner]));
    01941
    01942     track = CornerToTrackBits(halftile_corner);
    01943
    01944     int offset;
    01945     switch (track) {
    01946       default: NOT_REACHED();
    01947       case TRACK_BIT_UPPER: offset = RTO_N; break;
    01948       case TRACK_BIT_LOWER: offset = RTO_S; break;
    01949       case TRACK_BIT_RIGHT: offset = RTO_E; break;
    01950       case TRACK_BIT_LEFT:  offset = RTO_W; break;
    01951     }
    01952
    01953     DrawTrackSprite(ground + offset, PAL_NONE, ti, fake_slope);
    01954     if (_settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, track)) {
    01955       DrawTrackSprite(overlay + offset, PALETTE_CRASH, ti, fake_slope);
    01956     }
    01957   }
    01958 }
    01959
    01965 static void DrawTrackBits(TileInfo *ti, TrackBits track)
    01966 {
    01967   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    01968
    01969   if (rti->UsesOverlay()) {
    01970     DrawTrackBitsOverlay(ti, track, rti);
    01971     return;
    01972   }
    01973
    01974   RailGroundType rgt = GetRailGroundType(ti->tile);
    01975   Foundation f = GetRailFoundation(ti->tileh, track);
    01976   Corner halftile_corner = CORNER_INVALID;
    01977
    01978   if (IsNonContinuousFoundation(f)) {
    01979     /* Save halftile corner */
    01980     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
    01981     /* Draw lower part first */
    01982     track &= ~CornerToTrackBits(halftile_corner);
    01983     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
    01984   }
    01985
    01986   DrawFoundation(ti, f);
    01987   /* DrawFoundation modifies ti */
    01988
    01989   SpriteID image;
    01990   PaletteID pal = PAL_NONE;
    01991   const SubSprite *sub = NULL;
    01992   bool junction = false;
    01993
    01994   /* Select the sprite to use. */
    01995   if (track == 0) {
    01996     /* Clear ground (only track on halftile foundation) */
    01997     if (rgt == RAIL_GROUND_WATER) {
    01998       if (IsSteepSlope(ti->tileh)) {
    01999         DrawShoreTile(ti->tileh);
    02000         image = 0;
    02001       } else {
    02002         image = SPR_FLAT_WATER_TILE;
    02003       }
    02004     } else {
    02005       switch (rgt) {
    02006         case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    02007         case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
    02008         default:                     image = SPR_FLAT_GRASS_TILE; break;
    02009       }
    02010       image += _tileh_to_sprite[ti->tileh];
    02011     }
    02012   } else {
    02013     if (ti->tileh != SLOPE_FLAT) {
    02014       /* track on non-flat ground */
    02015       image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
    02016     } else {
    02017       /* track on flat ground */
    02018       (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
    02019       (image++,                           track == TRACK_BIT_X) ||
    02020       (image++,                           track == TRACK_BIT_UPPER) ||
    02021       (image++,                           track == TRACK_BIT_LOWER) ||
    02022       (image++,                           track == TRACK_BIT_RIGHT) ||
    02023       (image++,                           track == TRACK_BIT_LEFT) ||
    02024       (image++,                           track == TRACK_BIT_CROSS) ||
    02025
    02026       (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
    02027       (image++,                            track == TRACK_BIT_VERT) ||
    02028
    02029       (junction = true, false) ||
    02030       (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
    02031       (image++,                          (track & TRACK_BIT_3WAY_SW) == 0) ||
    02032       (image++,                          (track & TRACK_BIT_3WAY_NW) == 0) ||
    02033       (image++,                          (track & TRACK_BIT_3WAY_SE) == 0) ||
    02034       (image++, true);
    02035     }
    02036
    02037     switch (rgt) {
    02038       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    02039       case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset;  break;
    02040       case RAIL_GROUND_WATER: {
    02041         /* three-corner-raised slope */
    02042         DrawShoreTile(ti->tileh);
    02043         Corner track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    02044         sub = &(_halftile_sub_sprite[track_corner]);
    02045         break;
    02046       }
    02047       default: break;
    02048     }
    02049   }
    02050
    02051   if (image != 0) DrawGroundSprite(image, pal, sub);
    02052
    02053   /* Draw track pieces individually for junction tiles */
    02054   if (junction) {
    02055     if (track & TRACK_BIT_X)     DrawGroundSprite(rti->base_sprites.single_x, PAL_NONE);
    02056     if (track & TRACK_BIT_Y)     DrawGroundSprite(rti->base_sprites.single_y, PAL_NONE);
    02057     if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PAL_NONE);
    02058     if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PAL_NONE);
    02059     if (track & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PAL_NONE);
    02060     if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PAL_NONE);
    02061   }
    02062
    02063   /* PBS debugging, draw reserved tracks darker */
    02064   if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation) {
    02065     /* Get reservation, but mask track on halftile slope */
    02066     TrackBits pbs = GetRailReservationTrackBits(ti->tile) & track;
    02067     if (pbs & TRACK_BIT_X) {
    02068       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
    02069         DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH);
    02070       } else {
    02071         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
    02072       }
    02073     }
    02074     if (pbs & TRACK_BIT_Y) {
    02075       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
    02076         DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH);
    02077       } else {
    02078         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
    02079       }
    02080     }
    02081     if (pbs & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_N ? -TILE_HEIGHT : 0);
    02082     if (pbs & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_S ? -TILE_HEIGHT : 0);
    02083     if (pbs & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_W ? -TILE_HEIGHT : 0);
    02084     if (pbs & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_E ? -TILE_HEIGHT : 0);
    02085   }
    02086
    02087   if (IsValidCorner(halftile_corner)) {
    02088     DrawFoundation(ti, HalftileFoundation(halftile_corner));
    02089
    02090     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
    02091     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    02092     image = _track_sloped_sprites[fake_slope - 1] + rti->base_sprites.track_y;
    02093     pal = PAL_NONE;
    02094     switch (rgt) {
    02095       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    02096       case RAIL_GROUND_ICE_DESERT:
    02097       case RAIL_GROUND_HALF_SNOW:  image += rti->snow_offset;  break; // higher part has snow in this case too
    02098       default: break;
    02099     }
    02100     DrawGroundSprite(image, pal, &(_halftile_sub_sprite[halftile_corner]));
    02101
    02102     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, CornerToTrackBits(halftile_corner))) {
    02103       static const byte _corner_to_track_sprite[] = {3, 1, 2, 0};
    02104       DrawGroundSprite(_corner_to_track_sprite[halftile_corner] + rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, -TILE_HEIGHT);
    02105     }
    02106   }
    02107 }
    02108
    02114 enum {
    02115   SIGNAL_TO_SOUTHWEST =  0,
    02116   SIGNAL_TO_NORTHEAST =  2,
    02117   SIGNAL_TO_SOUTHEAST =  4,
    02118   SIGNAL_TO_NORTHWEST =  6,
    02119   SIGNAL_TO_EAST      =  8,
    02120   SIGNAL_TO_WEST      = 10,
    02121   SIGNAL_TO_SOUTH     = 12,
    02122   SIGNAL_TO_NORTH     = 14,
    02123 };
    02124
    02125 static void DrawSignals(TileIndex tile, TrackBits rails)
    02126 {
    02127 #define MAYBE_DRAW_SIGNAL(x, y, z, t) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, t, GetSingleSignalState(tile, x), y, z)
    02128
    02129   if (!(rails & TRACK_BIT_Y)) {
    02130     if (!(rails & TRACK_BIT_X)) {
    02131       if (rails & TRACK_BIT_LEFT) {
    02132         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTH, 0, TRACK_LEFT);
    02133         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTH, 1, TRACK_LEFT);
    02134       }
    02135       if (rails & TRACK_BIT_RIGHT) {
    02136         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_NORTH, 2, TRACK_RIGHT);
    02137         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_SOUTH, 3, TRACK_RIGHT);
    02138       }
    02139       if (rails & TRACK_BIT_UPPER) {
    02140         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_WEST, 4, TRACK_UPPER);
    02141         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_EAST, 5, TRACK_UPPER);
    02142       }
    02143       if (rails & TRACK_BIT_LOWER) {
    02144         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_WEST, 6, TRACK_LOWER);
    02145         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_EAST, 7, TRACK_LOWER);
    02146       }
    02147     } else {
    02148       MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHWEST, 8, TRACK_X);
    02149       MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHEAST, 9, TRACK_X);
    02150     }
    02151   } else {
    02152     MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHEAST, 10, TRACK_Y);
    02153     MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHWEST, 11, TRACK_Y);
    02154   }
    02155 }
    02156
    02157 static void DrawTile_Track(TileInfo *ti)
    02158 {
    02159   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    02160
    02161   _drawtile_track_palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
    02162
    02163   if (IsPlainRail(ti->tile)) {
    02164     TrackBits rails = GetTrackBits(ti->tile);
    02165
    02166     DrawTrackBits(ti, rails);
    02167
    02168     if (HasBit(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti, rti);
    02169
    02170     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    02171
    02172     if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
    02173   } else {
    02174     /* draw depot */
    02175     const DrawTileSprites *dts;
    02176     PaletteID pal = PAL_NONE;
    02177     SpriteID relocation;
    02178
    02179     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
    02180
    02181     if (IsInvisibilitySet(TO_BUILDINGS)) {
    02182       /* Draw rail instead of depot */
    02183       dts = &_depot_invisible_gfx_table[GetRailDepotDirection(ti->tile)];
    02184     } else {
    02185       dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
    02186     }
    02187
    02188     SpriteID image;
    02189     if (rti->UsesOverlay()) {
    02190       image = SPR_FLAT_GRASS_TILE;
    02191     } else {
    02192       image = dts->ground.sprite;
    02193       if (image != SPR_FLAT_GRASS_TILE) image += rti->total_offset;
    02194     }
    02195
    02196     /* adjust ground tile for desert
    02197      * don't adjust for snow, because snow in depots looks weird */
    02198     if (IsSnowRailGround(ti->tile) && _settings_game.game_creation.landscape == LT_TROPIC) {
    02199       if (image != SPR_FLAT_GRASS_TILE) {
    02200         image += rti->snow_offset; // tile with tracks
    02201       } else {
    02202         image = SPR_FLAT_SNOW_DESERT_TILE; // flat ground
    02203       }
    02204     }
    02205
    02206     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, _drawtile_track_palette));
    02207
    02208     if (rti->UsesOverlay()) {
    02209       SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
    02210
    02211       switch (GetRailDepotDirection(ti->tile)) {
    02212         case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02213         case DIAGDIR_SW: DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
    02214         case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02215         case DIAGDIR_SE: DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
    02216         default: break;
    02217       }
    02218
    02219       if (_settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
    02220         SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
    02221
    02222         switch (GetRailDepotDirection(ti->tile)) {
    02223           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02224           case DIAGDIR_SW: DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH); break;
    02225           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02226           case DIAGDIR_SE: DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH); break;
    02227           default: break;
    02228         }
    02229       }
    02230
    02231       relocation  = GetCustomRailSprite(rti, ti->tile, RTSG_DEPOT);
    02232       relocation -= SPR_RAIL_DEPOT_SE_1;
    02233     } else {
    02234       /* PBS debugging, draw reserved tracks darker */
    02235       if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
    02236         switch (GetRailDepotDirection(ti->tile)) {
    02237           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02238           case DIAGDIR_SW: DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH); break;
    02239           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02240           case DIAGDIR_SE: DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH); break;
    02241           default: break;
    02242         }
    02243       }
    02244
    02245       relocation = rti->total_offset;
    02246     }
    02247
    02248     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    02249
    02250     DrawRailTileSeq(ti, dts, TO_BUILDINGS, relocation, 0, _drawtile_track_palette);
    02251   }
    02252   DrawBridgeMiddle(ti);
    02253 }
    02254
    02255 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
    02256 {
    02257   const DrawTileSprites *dts = &_depot_gfx_table[dir];
    02258   const RailtypeInfo *rti = GetRailTypeInfo(railtype);
    02259   SpriteID image = rti->UsesOverlay() ? SPR_FLAT_GRASS_TILE : dts->ground.sprite;
    02260   uint32 offset = rti->total_offset;
    02261
    02262   x += 33;
    02263   y += 17;
    02264
    02265   if (image != SPR_FLAT_GRASS_TILE) image += offset;
    02266   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
    02267
    02268   DrawSprite(image, PAL_NONE, x, y);
    02269
    02270   if (rti->UsesOverlay()) {
    02271     SpriteID ground = GetCustomRailSprite(rti, INVALID_TILE, RTSG_GROUND);
    02272
    02273     switch (dir) {
    02274       case DIAGDIR_SW: DrawSprite(ground + RTO_X, PAL_NONE, x, y); break;
    02275       case DIAGDIR_SE: DrawSprite(ground + RTO_Y, PAL_NONE, x, y); break;
    02276       default: break;
    02277     }
    02278
    02279     offset  = GetCustomRailSprite(rti, INVALID_TILE, RTSG_DEPOT);
    02280     offset -= SPR_RAIL_DEPOT_SE_1;
    02281   }
    02282
    02283   DrawRailTileSeqInGUI(x, y, dts, offset, 0, palette);
    02284 }
    02285
    02286 static uint GetSlopeZ_Track(TileIndex tile, uint x, uint y)
    02287 {
    02288   uint z;
    02289   Slope tileh = GetTileSlope(tile, &z);
    02290
    02291   if (tileh == SLOPE_FLAT) return z;
    02292   if (IsPlainRail(tile)) {
    02293     z += ApplyFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
    02294     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
    02295   } else {
    02296     return z + TILE_HEIGHT;
    02297   }
    02298 }
    02299
    02300 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
    02301 {
    02302   return IsPlainRail(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
    02303 }
    02304
    02305 static void TileLoop_Track(TileIndex tile)
    02306 {
    02307   RailGroundType old_ground = GetRailGroundType(tile);
    02308   RailGroundType new_ground;
    02309
    02310   if (old_ground == RAIL_GROUND_WATER) {
    02311     TileLoop_Water(tile);
    02312     return;
    02313   }
    02314
    02315   switch (_settings_game.game_creation.landscape) {
    02316     case LT_ARCTIC: {
    02317       uint z;
    02318       Slope slope = GetTileSlope(tile, &z);
    02319       bool half = false;
    02320
    02321       /* for non-flat track, use lower part of track
    02322        * in other cases, use the highest part with track */
    02323       if (IsPlainRail(tile)) {
    02324         TrackBits track = GetTrackBits(tile);
    02325         Foundation f = GetRailFoundation(slope, track);
    02326
    02327         switch (f) {
    02328           case FOUNDATION_NONE:
    02329             /* no foundation - is the track on the upper side of three corners raised tile? */
    02330             if (IsSlopeWithThreeCornersRaised(slope)) z += TILE_HEIGHT;
    02331             break;
    02332
    02333           case FOUNDATION_INCLINED_X:
    02334           case FOUNDATION_INCLINED_Y:
    02335             /* sloped track - is it on a steep slope? */
    02336             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    02337             break;
    02338
    02339           case FOUNDATION_STEEP_LOWER:
    02340             /* only lower part of steep slope */
    02341             z += TILE_HEIGHT;
    02342             break;
    02343
    02344           default:
    02345             /* if it is a steep slope, then there is a track on higher part */
    02346             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    02347             z += TILE_HEIGHT;
    02348             break;
    02349         }
    02350
    02351         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
    02352       } else {
    02353         /* is the depot on a non-flat tile? */
    02354         if (slope != SLOPE_FLAT) z += TILE_HEIGHT;
    02355       }
    02356
    02357       /* 'z' is now the lowest part of the highest track bit -
    02358        * for sloped track, it is 'z' of lower part
    02359        * for two track bits, it is 'z' of higher track bit
    02360        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
    02361       if (z > GetSnowLine()) {
    02362         if (half && z - GetSnowLine() == TILE_HEIGHT) {
    02363           /* track on non-continuous foundation, lower part is not under snow */
    02364           new_ground = RAIL_GROUND_HALF_SNOW;
    02365         } else {
    02366           new_ground = RAIL_GROUND_ICE_DESERT;
    02367         }
    02368         goto set_ground;
    02369       }
    02370       break;
    02371       }
    02372
    02373     case LT_TROPIC:
    02374       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
    02375         new_ground = RAIL_GROUND_ICE_DESERT;
    02376         goto set_ground;
    02377       }
    02378       break;
    02379   }
    02380
    02381   new_ground = RAIL_GROUND_GRASS;
    02382
    02383   if (IsPlainRail(tile) && old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
    02384     /* determine direction of fence */
    02385     TrackBits rail = GetTrackBits(tile);
    02386
    02387     switch (rail) {
    02388       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
    02389       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
    02390       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
    02391       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
    02392
    02393       default: {
    02394         Owner owner = GetTileOwner(tile);
    02395
    02396         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
    02397               (rail & TRACK_BIT_3WAY_NW) == 0 &&
    02398               (rail & TRACK_BIT_X)
    02399             )) {
    02400           TileIndex n = tile + TileDiffXY(0, -1);
    02401           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02402
    02403           if (!IsTileType(n, MP_RAILWAY) ||
    02404               !IsTileOwner(n, owner) ||
    02405               nrail == TRACK_BIT_UPPER ||
    02406               nrail == TRACK_BIT_LEFT) {
    02407             new_ground = RAIL_GROUND_FENCE_NW;
    02408           }
    02409         }
    02410
    02411         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
    02412               (rail & TRACK_BIT_3WAY_SE) == 0 &&
    02413               (rail & TRACK_BIT_X)
    02414             )) {
    02415           TileIndex n = tile + TileDiffXY(0, 1);
    02416           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02417
    02418           if (!IsTileType(n, MP_RAILWAY) ||
    02419               !IsTileOwner(n, owner) ||
    02420               nrail == TRACK_BIT_LOWER ||
    02421               nrail == TRACK_BIT_RIGHT) {
    02422             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
    02423               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
    02424           }
    02425         }
    02426
    02427         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
    02428               (rail & TRACK_BIT_3WAY_NE) == 0 &&
    02429               (rail & TRACK_BIT_Y)
    02430             )) {
    02431           TileIndex n = tile + TileDiffXY(-1, 0);
    02432           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02433
    02434           if (!IsTileType(n, MP_RAILWAY) ||
    02435               !IsTileOwner(n, owner) ||
    02436               nrail == TRACK_BIT_UPPER ||
    02437               nrail == TRACK_BIT_RIGHT) {
    02438             new_ground = RAIL_GROUND_FENCE_NE;
    02439           }
    02440         }
    02441
    02442         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
    02443               (rail & TRACK_BIT_3WAY_SW) == 0 &&
    02444               (rail & TRACK_BIT_Y)
    02445             )) {
    02446           TileIndex n = tile + TileDiffXY(1, 0);
    02447           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02448
    02449           if (!IsTileType(n, MP_RAILWAY) ||
    02450               !IsTileOwner(n, owner) ||
    02451               nrail == TRACK_BIT_LOWER ||
    02452               nrail == TRACK_BIT_LEFT) {
    02453             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
    02454               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
    02455           }
    02456         }
    02457         break;
    02458       }
    02459     }
    02460   }
    02461
    02462 set_ground:
    02463   if (old_ground != new_ground) {
    02464     SetRailGroundType(tile, new_ground);
    02465     MarkTileDirtyByTile(tile);
    02466   }
    02467 }
    02468
    02469
    02470 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
    02471 {
    02472   /* Case of half tile slope with water. */
    02473   if (mode == TRANSPORT_WATER && IsPlainRail(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
    02474     TrackBits tb = GetTrackBits(tile);
    02475     switch (tb) {
    02476       default: NOT_REACHED();
    02477       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
    02478       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
    02479       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
    02480       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
    02481     }
    02482     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
    02483   }
    02484
    02485   if (mode != TRANSPORT_RAIL) return 0;
    02486
    02487   TrackBits trackbits = TRACK_BIT_NONE;
    02488   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
    02489
    02490   switch (GetRailTileType(tile)) {
    02491     default: NOT_REACHED();
    02492     case RAIL_TILE_NORMAL:
    02493       trackbits = GetTrackBits(tile);
    02494       break;
    02495
    02496     case RAIL_TILE_SIGNALS: {
    02497       trackbits = GetTrackBits(tile);
    02498       byte a = GetPresentSignals(tile);
    02499       uint b = GetSignalStates(tile);
    02500
    02501       b &= a;
    02502
    02503       /* When signals are not present (in neither direction),
    02504        * we pretend them to be green. Otherwise, it depends on
    02505        * the signal type. For signals that are only active from
    02506        * one side, we set the missing signals explicitely to
    02507        * `green'. Otherwise, they implicitely become `red'. */
    02508       if (!IsOnewaySignal(tile, TRACK_UPPER) || (a & SignalOnTrack(TRACK_UPPER)) == 0) b |= ~a & SignalOnTrack(TRACK_UPPER);
    02509       if (!IsOnewaySignal(tile, TRACK_LOWER) || (a & SignalOnTrack(TRACK_LOWER)) == 0) b |= ~a & SignalOnTrack(TRACK_LOWER);
    02510
    02511       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
    02512       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
    02513       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
    02514       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
    02515
    02516       break;
    02517     }
    02518
    02519     case RAIL_TILE_DEPOT: {
    02520       DiagDirection dir = GetRailDepotDirection(tile);
    02521
    02522       if (side != INVALID_DIAGDIR && side != dir) break;
    02523
    02524       trackbits = DiagDirToDiagTrackBits(dir);
    02525       break;
    02526     }
    02527   }
    02528
    02529   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
    02530 }
    02531
    02532 static bool ClickTile_Track(TileIndex tile)
    02533 {
    02534   if (!IsRailDepot(tile)) return false;
    02535
    02536   ShowDepotWindow(tile, VEH_TRAIN);
    02537   return true;
    02538 }
    02539
    02540 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
    02541 {
    02542   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
    02543   td->rail_speed = rti->max_speed;
    02544   td->owner[0] = GetTileOwner(tile);
    02545   switch (GetRailTileType(tile)) {
    02546     case RAIL_TILE_NORMAL:
    02547       td->str = STR_LAI_RAIL_DESCRIPTION_TRACK;
    02548       break;
    02549
    02550     case RAIL_TILE_SIGNALS: {
    02551       static const StringID signal_type[6][6] = {
    02552         {
    02553           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_SIGNALS,
    02554           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
    02555           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
    02556           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02557           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
    02558           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS
    02559         },
    02560         {
    02561           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
    02562           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRESIGNALS,
    02563           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
    02564           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
    02565           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
    02566           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS
    02567         },
    02568         {
    02569           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
    02570           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
    02571           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXITSIGNALS,
    02572           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
    02573           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
    02574           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS
    02575         },
    02576         {
    02577           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02578           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
    02579           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
    02580           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBOSIGNALS,
    02581           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
    02582           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS
    02583         },
    02584         {
    02585           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
    02586           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
    02587           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
    02588           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
    02589           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBSSIGNALS,
    02590           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS
    02591         },
    02592         {
    02593           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS,
    02594           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS,
    02595           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS,
    02596           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS,
    02597           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS,
    02598           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NOENTRYSIGNALS
    02599         }
    02600       };
    02601
    02602       SignalType primary_signal;
    02603       SignalType secondary_signal;
    02604       if (HasSignalOnTrack(tile, TRACK_UPPER)) {
    02605         primary_signal = GetSignalType(tile, TRACK_UPPER);
    02606         secondary_signal = HasSignalOnTrack(tile, TRACK_LOWER) ? GetSignalType(tile, TRACK_LOWER) : primary_signal;
    02607       } else {
    02608         secondary_signal = primary_signal = GetSignalType(tile, TRACK_LOWER);
    02609       }
    02610
    02611       td->str = signal_type[secondary_signal][primary_signal];
    02612       break;
    02613     }
    02614
    02615     case RAIL_TILE_DEPOT:
    02616       td->str = STR_LAI_RAIL_DESCRIPTION_TRAIN_DEPOT;
    02617       if (_settings_game.vehicle.train_acceleration_model != AM_ORIGINAL) {
    02618         if (td->rail_speed > 0) {
    02619           td->rail_speed = min(td->rail_speed, 61);
    02620         } else {
    02621           td->rail_speed = 61;
    02622         }
    02623       }
    02624       break;
    02625
    02626     default:
    02627       NOT_REACHED();
    02628   }
    02629 }
    02630
    02631 static void ChangeTileOwner_Track(TileIndex tile, Owner old_owner, Owner new_owner)
    02632 {
    02633   if (!IsTileOwner(tile, old_owner)) return;
    02634
    02635   if (new_owner != INVALID_OWNER) {
    02636     SetTileOwner(tile, new_owner);
    02637   } else {
    02638     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
    02639   }
    02640 }
    02641
    02642 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
    02643 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
    02644 static const int8 _deltacoord_leaveoffset[8] = {
    02645   -1,  0,  1,  0, /* x */
    02646    0,  1,  0, -1  /* y */
    02647 };
    02648
    02649
    02655 int TicksToLeaveDepot(const Train *v)
    02656 {
    02657   DiagDirection dir = GetRailDepotDirection(v->tile);
    02658   int length = v->tcache.cached_veh_length;
    02659
    02660   switch (dir) {
    02661     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
    02662     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
    02663     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
    02664     default:
    02665     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
    02666   }
    02667
    02668   return 0; // make compilers happy
    02669 }
    02670
    02673 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *u, TileIndex tile, int x, int y)
    02674 {
    02675   /* this routine applies only to trains in depot tiles */
    02676   if (u->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
    02677
    02678   Train *v = Train::From(u);
    02679
    02680   /* depot direction */
    02681   DiagDirection dir = GetRailDepotDirection(tile);
    02682
    02683   /* calculate the point where the following wagon should be activated
    02684    * this depends on the length of the current vehicle */
    02685   int length = v->tcache.cached_veh_length;
    02686
    02687   byte fract_coord_leave =
    02688     ((_fractcoords_enter[dir] & 0x0F) + // x
    02689       (length + 1) * _deltacoord_leaveoffset[dir]) +
    02690     (((_fractcoords_enter[dir] >> 4) +  // y
    02691       ((length + 1) * _deltacoord_leaveoffset[dir + 4])) << 4);
    02692
    02693   byte fract_coord = (x & 0xF) + ((y & 0xF) << 4);
    02694
    02695   if (_fractcoords_behind[dir] == fract_coord) {
    02696     /* make sure a train is not entering the tile from behind */
    02697     return VETSB_CANNOT_ENTER;
    02698   } else if (_fractcoords_enter[dir] == fract_coord) {
    02699     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
    02700       /* enter the depot */
    02701       v->track = TRACK_BIT_DEPOT,
    02702       v->vehstatus |= VS_HIDDEN; // hide it
    02703       v->direction = ReverseDir(v->direction);
    02704       if (v->Next() == NULL) VehicleEnterDepot(v->First());
    02705       v->tile = tile;
    02706
    02707       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
    02708       return VETSB_ENTERED_WORMHOLE;
    02709     }
    02710   } else if (fract_coord_leave == fract_coord) {
    02711     if (DiagDirToDir(dir) == v->direction) {
    02712       /* leave the depot? */
    02713       if ((v = v->Next()) != NULL) {
    02714         v->vehstatus &= ~VS_HIDDEN;
    02715         v->track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
    02716       }
    02717     }
    02718   }
    02719
    02720   return VETSB_CONTINUE;
    02721 }
    02722
    02734 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, uint z_old, Slope tileh_old, uint z_new, Slope tileh_new, TrackBits rail_bits)
    02735 {
    02736   if (!_settings_game.construction.build_on_slopes || !AutoslopeEnabled()) return CMD_ERROR;
    02737
    02738   /* Is the slope-rail_bits combination valid in general? I.e. is it safe to call GetRailFoundation() ? */
    02739   if (CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile).Failed()) return CMD_ERROR;
    02740
    02741   /* Get the slopes on top of the foundations */
    02742   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
    02743   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
    02744
    02745   Corner track_corner;
    02746   switch (rail_bits) {
    02747     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
    02748     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
    02749     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
    02750     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
    02751
    02752     /* Surface slope must not be changed */
    02753     default: return (((z_old != z_new) || (tileh_old != tileh_new)) ? CMD_ERROR : CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]));
    02754   }
    02755
    02756   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
    02757   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
    02758   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
    02759   if (z_old != z_new) return CMD_ERROR;
    02760
    02761   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    02762   /* Make the ground dirty, if surface slope has changed */
    02763   if (tileh_old != tileh_new) {
    02764     /* If there is flat water on the lower halftile add the cost for clearing it */
    02765     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price[PR_CLEAR_WATER]);
    02766     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02767   }
    02768   return  cost;
    02769 }
    02770
    02771 static CommandCost TerraformTile_Track(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
    02772 {
    02773   uint z_old;
    02774   Slope tileh_old = GetTileSlope(tile, &z_old);
    02775   if (IsPlainRail(tile)) {
    02776     TrackBits rail_bits = GetTrackBits(tile);
    02777     /* Is there flat water on the lower halftile, that must be cleared expensively? */
    02778     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
    02779
    02780     _error_message = STR_ERROR_MUST_REMOVE_RAILROAD_TRACK;
    02781
    02782     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
    02783     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
    02784
    02785     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
    02786     Corner allowed_corner;
    02787     switch (rail_bits) {
    02788       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
    02789       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
    02790       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
    02791       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
    02792       default: return autoslope_result;
    02793     }
    02794
    02795     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
    02796
    02797     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
    02798     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
    02799
    02800     /* Everything is valid, which only changes allowed_corner */
    02801     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
    02802       if (allowed_corner == corner) continue;
    02803       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
    02804     }
    02805
    02806     /* Make the ground dirty */
    02807     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02808
    02809     /* allow terraforming */
    02810     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price[PR_CLEAR_WATER] : (Money)0);
    02811   } else if (_settings_game.construction.build_on_slopes && AutoslopeEnabled() &&
    02812       AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) {
    02813     return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    02814   }
    02815   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    02816 }
    02817
    02818
    02819 extern const TileTypeProcs _tile_type_rail_procs = {
    02820   DrawTile_Track,           // draw_tile_proc
    02821   GetSlopeZ_Track,          // get_slope_z_proc
    02822   ClearTile_Track,          // clear_tile_proc
    02823   NULL,                     // add_accepted_cargo_proc
    02824   GetTileDesc_Track,        // get_tile_desc_proc
    02825   GetTileTrackStatus_Track, // get_tile_track_status_proc
    02826   ClickTile_Track,          // click_tile_proc
    02827   NULL,                     // animate_tile_proc
    02828   TileLoop_Track,           // tile_loop_clear
    02829   ChangeTileOwner_Track,    // change_tile_owner_clear
    02830   NULL,                     // add_produced_cargo_proc
    02831   VehicleEnter_Track,       // vehicle_enter_tile_proc
    02832   GetFoundation_Track,      // get_foundation_proc
    02833   TerraformTile_Track,      // terraform_tile_proc
    02834 };