# rail_cmd.cpp

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    00001 /* $Id: rail_cmd.cpp 19222 2010-02-23 23:18:41Z 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
    00044 RailtypeInfo _railtypes[RAILTYPE_END];
    00045
    00046 assert_compile(sizeof(_original_railtypes) <= sizeof(_railtypes));
    00047
    00051 void ResetRailTypes()
    00052 {
    00053   memset(_railtypes, 0, sizeof(_railtypes));
    00054   memcpy(_railtypes, _original_railtypes, sizeof(_original_railtypes));
    00055 }
    00056
    00057 void ResolveRailTypeGUISprites(RailtypeInfo *rti)
    00058 {
    00059   SpriteID cursors_base = GetCustomRailSprite(rti, INVALID_TILE, RTSG_CURSORS);
    00060   if (cursors_base != 0) {
    00061     rti->gui_sprites.build_ns_rail = cursors_base +  0;
    00062     rti->gui_sprites.build_x_rail  = cursors_base +  1;
    00063     rti->gui_sprites.build_ew_rail = cursors_base +  2;
    00064     rti->gui_sprites.build_y_rail  = cursors_base +  3;
    00065     rti->gui_sprites.auto_rail     = cursors_base +  4;
    00066     rti->gui_sprites.build_depot   = cursors_base +  5;
    00067     rti->gui_sprites.build_tunnel  = cursors_base +  6;
    00068     rti->gui_sprites.convert_rail  = cursors_base +  7;
    00069     rti->cursor.rail_ns   = cursors_base +  8;
    00070     rti->cursor.rail_swne = cursors_base +  9;
    00071     rti->cursor.rail_ew   = cursors_base + 10;
    00072     rti->cursor.rail_nwse = cursors_base + 11;
    00073     rti->cursor.autorail  = cursors_base + 12;
    00074     rti->cursor.depot     = cursors_base + 13;
    00075     rti->cursor.tunnel    = cursors_base + 14;
    00076     rti->cursor.convert   = cursors_base + 15;
    00077   }
    00078 }
    00079
    00080 void InitRailTypes()
    00081 {
    00082   for (RailType rt = RAILTYPE_BEGIN; rt != RAILTYPE_END; rt++) {
    00083     RailtypeInfo *rti = &_railtypes[rt];
    00084     ResolveRailTypeGUISprites(rti);
    00085   }
    00086 }
    00087
    00088 RailType AllocateRailType(RailTypeLabel label)
    00089 {
    00090   for (RailType rt = RAILTYPE_BEGIN; rt != RAILTYPE_END; rt++) {
    00091     RailtypeInfo *rti = &_railtypes[rt];
    00092
    00093     if (rti->label == 0) {
    00094       /* Set up new rail type */
    00095       memcpy(rti, &_railtypes[RAILTYPE_RAIL], sizeof(*rti));
    00096       rti->label = label;
    00097
    00098       /* Make us compatible with ourself. */
    00099       rti->powered_railtypes    = (RailTypes)(1 << rt);
    00100       rti->compatible_railtypes = (RailTypes)(1 << rt);
    00101       return rt;
    00102     }
    00103   }
    00104
    00105   return INVALID_RAILTYPE;
    00106 }
    00107
    00108 static const byte _track_sloped_sprites[14] = {
    00109   14, 15, 22, 13,
    00110    0, 21, 17, 12,
    00111   23,  0, 18, 20,
    00112   19, 16
    00113 };
    00114
    00115
    00116 /*         4
    00117  *     ---------
    00118  *    |\       /|
    00119  *    | \    1/ |
    00120  *    |  \   /  |
    00121  *    |   \ /   |
    00122  *  16|    \    |32
    00123  *    |   / \2  |
    00124  *    |  /   \  |
    00125  *    | /     \ |
    00126  *    |/       \|
    00127  *     ---------
    00128  *         8
    00129  */
    00130
    00131
    00132
    00133 /* MAP2 byte:    abcd???? => Signal On? Same coding as map3lo
    00134  * MAP3LO byte:  abcd???? => Signal Exists?
    00135  *               a and b are for diagonals, upper and left,
    00136  *               one for each direction. (ie a == NE->SW, b ==
    00137  *               SW->NE, or v.v., I don't know. b and c are
    00138  *               similar for lower and right.
    00139  * MAP2 byte:    ????abcd => Type of ground.
    00140  * MAP3LO byte:  ????abcd => Type of rail.
    00141  * MAP5:         00abcdef => rail
    00142  *               01abcdef => rail w/ signals
    00143  *               10uuuuuu => unused
    00144  *               11uuuudd => rail depot
    00145  */
    00146
    00147
    00148 Vehicle *EnsureNoTrainOnTrackProc(Vehicle *v, void *data)
    00149 {
    00150   TrackBits rail_bits = *(TrackBits *)data;
    00151
    00152   if (v->type != VEH_TRAIN) return NULL;
    00153
    00154   Train *t = Train::From(v);
    00155   if ((t->track != rail_bits) && !TracksOverlap(t->track | rail_bits)) return NULL;
    00156
    00157   _error_message = STR_ERROR_TRAIN_IN_THE_WAY + v->type;
    00158   return v;
    00159 }
    00160
    00168 static bool EnsureNoTrainOnTrack(TileIndex tile, Track track)
    00169 {
    00170   TrackBits rail_bits = TrackToTrackBits(track);
    00171
    00172   return !HasVehicleOnPos(tile, &rail_bits, &EnsureNoTrainOnTrackProc);
    00173 }
    00174
    00181 static CommandCost CheckTrackCombination(TileIndex tile, TrackBits to_build, uint flags)
    00182 {
    00183   if (!IsPlainRail(tile)) return_cmd_error(STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION);
    00184
    00185   /* So, we have a tile with tracks on it (and possibly signals). Let's see
    00186    * what tracks first */
    00187   TrackBits current = GetTrackBits(tile); // The current track layout.
    00188   TrackBits future = current | to_build;  // The track layout we want to build.
    00189
    00190   /* Are we really building something new? */
    00191   if (current == future) {
    00192     /* Nothing new is being built */
    00193     return_cmd_error(STR_ERROR_ALREADY_BUILT);
    00194   }
    00195
    00196   /* Let's see if we may build this */
    00197   if ((flags & DC_NO_RAIL_OVERLAP) || HasSignals(tile)) {
    00198     /* If we are not allowed to overlap (flag is on for ai companies or we have
    00199      * signals on the tile), check that */
    00200     if (future != TRACK_BIT_HORZ && future != TRACK_BIT_VERT) {
    00201       return_cmd_error((flags & DC_NO_RAIL_OVERLAP) ? STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION : STR_ERROR_MUST_REMOVE_SIGNALS_FIRST);
    00202     }
    00203   }
    00204   /* Normally, we may overlap and any combination is valid */
    00205   return CommandCost();
    00206 }
    00207
    00208
    00210 static const TrackBits _valid_tracks_without_foundation[15] = {
    00211   TRACK_BIT_ALL,
    00212   TRACK_BIT_RIGHT,
    00213   TRACK_BIT_UPPER,
    00214   TRACK_BIT_X,
    00215
    00216   TRACK_BIT_LEFT,
    00217   TRACK_BIT_NONE,
    00218   TRACK_BIT_Y,
    00219   TRACK_BIT_LOWER,
    00220
    00221   TRACK_BIT_LOWER,
    00222   TRACK_BIT_Y,
    00223   TRACK_BIT_NONE,
    00224   TRACK_BIT_LEFT,
    00225
    00226   TRACK_BIT_X,
    00227   TRACK_BIT_UPPER,
    00228   TRACK_BIT_RIGHT,
    00229 };
    00230
    00232 static const TrackBits _valid_tracks_on_leveled_foundation[15] = {
    00233   TRACK_BIT_NONE,
    00234   TRACK_BIT_LEFT,
    00235   TRACK_BIT_LOWER,
    00236   TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,
    00237
    00238   TRACK_BIT_RIGHT,
    00239   TRACK_BIT_ALL,
    00240   TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,
    00241   TRACK_BIT_ALL,
    00242
    00243   TRACK_BIT_UPPER,
    00244   TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,
    00245   TRACK_BIT_ALL,
    00246   TRACK_BIT_ALL,
    00247
    00248   TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,
    00249   TRACK_BIT_ALL,
    00250   TRACK_BIT_ALL
    00251 };
    00252
    00260 Foundation GetRailFoundation(Slope tileh, TrackBits bits)
    00261 {
    00262   if (bits == TRACK_BIT_NONE) return FOUNDATION_NONE;
    00263
    00264   if (IsSteepSlope(tileh)) {
    00265     /* Test for inclined foundations */
    00266     if (bits == TRACK_BIT_X) return FOUNDATION_INCLINED_X;
    00267     if (bits == TRACK_BIT_Y) return FOUNDATION_INCLINED_Y;
    00268
    00269     /* Get higher track */
    00270     Corner highest_corner = GetHighestSlopeCorner(tileh);
    00271     TrackBits higher_track = CornerToTrackBits(highest_corner);
    00272
    00273     /* Only higher track? */
    00274     if (bits == higher_track) return HalftileFoundation(highest_corner);
    00275
    00276     /* Overlap with higher track? */
    00277     if (TracksOverlap(bits | higher_track)) return FOUNDATION_INVALID;
    00278
    00279     /* either lower track or both higher and lower track */
    00280     return ((bits & higher_track) != 0 ? FOUNDATION_STEEP_BOTH : FOUNDATION_STEEP_LOWER);
    00281   } else {
    00282     if ((~_valid_tracks_without_foundation[tileh] & bits) == 0) return FOUNDATION_NONE;
    00283
    00284     bool valid_on_leveled = ((~_valid_tracks_on_leveled_foundation[tileh] & bits) == 0);
    00285
    00286     Corner track_corner;
    00287     switch (bits) {
    00288       case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
    00289       case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
    00290       case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
    00291       case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
    00292
    00293       case TRACK_BIT_HORZ:
    00294         if (tileh == SLOPE_N) return HalftileFoundation(CORNER_N);
    00295         if (tileh == SLOPE_S) return HalftileFoundation(CORNER_S);
    00296         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00297
    00298       case TRACK_BIT_VERT:
    00299         if (tileh == SLOPE_W) return HalftileFoundation(CORNER_W);
    00300         if (tileh == SLOPE_E) return HalftileFoundation(CORNER_E);
    00301         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00302
    00303       case TRACK_BIT_X:
    00304         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_X;
    00305         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00306
    00307       case TRACK_BIT_Y:
    00308         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_Y;
    00309         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00310
    00311       default:
    00312         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00313     }
    00314     /* Single diagonal track */
    00315
    00316     /* Track must be at least valid on leveled foundation */
    00317     if (!valid_on_leveled) return FOUNDATION_INVALID;
    00318
    00319     /* If slope has three raised corners, build leveled foundation */
    00320     if (IsSlopeWithThreeCornersRaised(tileh)) return FOUNDATION_LEVELED;
    00321
    00322     /* If neighboured corners of track_corner are lowered, build halftile foundation */
    00323     if ((tileh & SlopeWithThreeCornersRaised(OppositeCorner(track_corner))) == SlopeWithOneCornerRaised(track_corner)) return HalftileFoundation(track_corner);
    00324
    00325     /* else special anti-zig-zag foundation */
    00326     return SpecialRailFoundation(track_corner);
    00327   }
    00328 }
    00329
    00330
    00340 static CommandCost CheckRailSlope(Slope tileh, TrackBits rail_bits, TrackBits existing, TileIndex tile)
    00341 {
    00342   /* don't allow building on the lower side of a coast */
    00343   if (IsTileType(tile, MP_WATER) || (IsTileType(tile, MP_RAILWAY) && (GetRailGroundType(tile) == RAIL_GROUND_WATER))) {
    00344     if (!IsSteepSlope(tileh) && ((~_valid_tracks_on_leveled_foundation[tileh] & (rail_bits | existing)) != 0)) return_cmd_error(STR_ERROR_CAN_T_BUILD_ON_WATER);
    00345   }
    00346
    00347   Foundation f_new = GetRailFoundation(tileh, rail_bits | existing);
    00348
    00349   /* check track/slope combination */
    00350   if ((f_new == FOUNDATION_INVALID) ||
    00351       ((f_new != FOUNDATION_NONE) && (!_settings_game.construction.build_on_slopes))) {
    00352     return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
    00353   }
    00354
    00355   Foundation f_old = GetRailFoundation(tileh, existing);
    00356   return CommandCost(EXPENSES_CONSTRUCTION, f_new != f_old ? _price[PR_BUILD_FOUNDATION] : (Money)0);
    00357 }
    00358
    00359 /* Validate functions for rail building */
    00360 static inline bool ValParamTrackOrientation(Track track) {return IsValidTrack(track);}
    00361
    00370 CommandCost CmdBuildSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00371 {
    00372   RailType railtype = (RailType)p1;
    00373   Track track = (Track)p2;
    00374   CommandCost cost(EXPENSES_CONSTRUCTION);
    00375
    00376   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
    00377
    00378   Slope tileh = GetTileSlope(tile, NULL);
    00379   TrackBits trackbit = TrackToTrackBits(track);
    00380
    00381   switch (GetTileType(tile)) {
    00382     case MP_RAILWAY: {
    00383       if (!CheckTileOwnership(tile)) return CMD_ERROR;
    00384
    00385       if (!IsPlainRail(tile)) return CMD_ERROR;
    00386
    00387       if (!IsCompatibleRail(GetRailType(tile), railtype)) return_cmd_error(STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION);
    00388
    00389       CommandCost ret = CheckTrackCombination(tile, trackbit, flags);
    00390       ret.SetGlobalErrorMessage();
    00391       if (ret.Failed()) return ret;
    00392
    00393       if (!EnsureNoTrainOnTrack(tile, track)) return CMD_ERROR;
    00394
    00395       ret = CheckRailSlope(tileh, trackbit, GetTrackBits(tile), tile);
    00396       if (ret.Failed()) return ret;
    00397       cost.AddCost(ret);
    00398
    00399       /* If the rail types don't match, try to convert only if engines of
    00400        * the new rail type are not powered on the present rail type and engines of
    00401        * the present rail type are powered on the new rail type. */
    00402       if (GetRailType(tile) != railtype && !HasPowerOnRail(railtype, GetRailType(tile))) {
    00403         if (HasPowerOnRail(GetRailType(tile), railtype)) {
    00404           ret = DoCommand(tile, tile, railtype, flags, CMD_CONVERT_RAIL);
    00405           if (ret.Failed()) return ret;
    00406           cost.AddCost(ret);
    00407         } else {
    00408           return CMD_ERROR;
    00409         }
    00410       }
    00411
    00412       if (flags & DC_EXEC) {
    00413         SetRailGroundType(tile, RAIL_GROUND_BARREN);
    00414         SetTrackBits(tile, GetTrackBits(tile) | trackbit);
    00415       }
    00416       break;
    00417     }
    00418
    00419     case MP_ROAD:
    00420 #define M(x) (1 << (x))
    00421       /* Level crossings may only be built on these slopes */
    00422       if (!HasBit(M(SLOPE_SEN) | M(SLOPE_ENW) | M(SLOPE_NWS) | M(SLOPE_NS) | M(SLOPE_WSE) | M(SLOPE_EW) | M(SLOPE_FLAT), tileh)) {
    00423         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
    00424       }
    00425 #undef M
    00426
    00427       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00428
    00429       if (IsNormalRoad(tile)) {
    00430         if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
    00431
    00432         if (GetDisallowedRoadDirections(tile) != DRD_NONE) return_cmd_error(STR_ERROR_CROSSING_ON_ONEWAY_ROAD);
    00433
    00434         RoadTypes roadtypes = GetRoadTypes(tile);
    00435         RoadBits road = GetRoadBits(tile, ROADTYPE_ROAD);
    00436         RoadBits tram = GetRoadBits(tile, ROADTYPE_TRAM);
    00437         switch (roadtypes) {
    00438           default: break;
    00439           case ROADTYPES_TRAM:
    00440             /* Tram crossings must always have road. */
    00441             if (flags & DC_EXEC) SetRoadOwner(tile, ROADTYPE_ROAD, _current_company);
    00442             roadtypes |= ROADTYPES_ROAD;
    00443             break;
    00444
    00445           case ROADTYPES_ALL:
    00446             if (road != tram) return CMD_ERROR;
    00447             break;
    00448         }
    00449
    00450         road |= tram;
    00451
    00452         if ((track == TRACK_X && road == ROAD_Y) ||
    00453             (track == TRACK_Y && road == ROAD_X)) {
    00454           if (flags & DC_EXEC) {
    00455             MakeRoadCrossing(tile, GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), _current_company, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, roadtypes, GetTownIndex(tile));
    00456             UpdateLevelCrossing(tile, false);
    00457           }
    00458           break;
    00459         }
    00460       }
    00461
    00462       if (IsLevelCrossing(tile) && GetCrossingRailBits(tile) == trackbit) {
    00463         return_cmd_error(STR_ERROR_ALREADY_BUILT);
    00464       }
    00465       /* FALLTHROUGH */
    00466
    00467     default: {
    00468       /* Will there be flat water on the lower halftile? */
    00469       bool water_ground = IsTileType(tile, MP_WATER) && IsSlopeWithOneCornerRaised(tileh);
    00470
    00471       CommandCost ret = CheckRailSlope(tileh, trackbit, TRACK_BIT_NONE, tile);
    00472       if (ret.Failed()) return ret;
    00473       cost.AddCost(ret);
    00474
    00475       ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00476       if (ret.Failed()) return ret;
    00477       cost.AddCost(ret);
    00478
    00479       if (water_ground) {
    00480         cost.AddCost(-_price[PR_CLEAR_WATER]);
    00481         cost.AddCost(_price[PR_CLEAR_ROUGH]);
    00482       }
    00483
    00484       if (flags & DC_EXEC) {
    00485         MakeRailNormal(tile, _current_company, trackbit, railtype);
    00486         if (water_ground) SetRailGroundType(tile, RAIL_GROUND_WATER);
    00487       }
    00488       break;
    00489     }
    00490   }
    00491
    00492   if (flags & DC_EXEC) {
    00493     MarkTileDirtyByTile(tile);
    00494     AddTrackToSignalBuffer(tile, track, _current_company);
    00495     YapfNotifyTrackLayoutChange(tile, track);
    00496   }
    00497
    00498   cost.AddCost(RailBuildCost(railtype));
    00499   return cost;
    00500 }
    00501
    00510 CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00511 {
    00512   Track track = (Track)p2;
    00513   CommandCost cost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_RAIL] );
    00514   bool crossing = false;
    00515
    00516   if (!ValParamTrackOrientation((Track)p2)) return CMD_ERROR;
    00517   TrackBits trackbit = TrackToTrackBits(track);
    00518
    00519   /* Need to read tile owner now because it may change when the rail is removed
    00520    * Also, in case of floods, _current_company != owner
    00521    * There may be invalid tiletype even in exec run (when removing long track),
    00522    * so do not call GetTileOwner(tile) in any case here */
    00523   Owner owner = INVALID_OWNER;
    00524
    00525   Train *v = NULL;
    00526
    00527   switch (GetTileType(tile)) {
    00528     case MP_ROAD: {
    00529       if (!IsLevelCrossing(tile) ||
    00530           GetCrossingRailBits(tile) != trackbit ||
    00531           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
    00532           (!(flags & DC_BANKRUPT) && !EnsureNoVehicleOnGround(tile))) {
    00533         return CMD_ERROR;
    00534       }
    00535
    00536       if (flags & DC_EXEC) {
    00537         if (HasReservedTracks(tile, trackbit)) {
    00538           v = GetTrainForReservation(tile, track);
    00539           if (v != NULL) FreeTrainTrackReservation(v);
    00540         }
    00541         owner = GetTileOwner(tile);
    00542         MakeRoadNormal(tile, GetCrossingRoadBits(tile), GetRoadTypes(tile), GetTownIndex(tile), GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM));
    00543       }
    00544       break;
    00545     }
    00546
    00547     case MP_RAILWAY: {
    00548       TrackBits present;
    00549
    00550       if (!IsPlainRail(tile) ||
    00551           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
    00552           !EnsureNoTrainOnTrack(tile, track)) {
    00553         return CMD_ERROR;
    00554       }
    00555
    00556       present = GetTrackBits(tile);
    00557       if ((present & trackbit) == 0) return CMD_ERROR;
    00558       if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
    00559
    00560       /* Charge extra to remove signals on the track, if they are there */
    00561       if (HasSignalOnTrack(tile, track))
    00562         cost.AddCost(DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS));
    00563
    00564       if (flags & DC_EXEC) {
    00565         if (HasReservedTracks(tile, trackbit)) {
    00566           v = GetTrainForReservation(tile, track);
    00567           if (v != NULL) FreeTrainTrackReservation(v);
    00568         }
    00569         owner = GetTileOwner(tile);
    00570         present ^= trackbit;
    00571         if (present == 0) {
    00572           Slope tileh = GetTileSlope(tile, NULL);
    00573           /* If there is flat water on the lower halftile, convert the tile to shore so the water remains */
    00574           if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh)) {
    00575             MakeShore(tile);
    00576           } else {
    00577             DoClearSquare(tile);
    00578           }
    00579         } else {
    00580           SetTrackBits(tile, present);
    00581           SetTrackReservation(tile, GetRailReservationTrackBits(tile) & present);
    00582         }
    00583       }
    00584       break;
    00585     }
    00586
    00587     default: return CMD_ERROR;
    00588   }
    00589
    00590   if (flags & DC_EXEC) {
    00591     /* if we got that far, 'owner' variable is set correctly */
    00592     assert(Company::IsValidID(owner));
    00593
    00594     MarkTileDirtyByTile(tile);
    00595     if (crossing) {
    00596       /* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we
    00597        * are removing one of these pieces, we'll need to update signals for
    00598        * both directions explicitly, as after the track is removed it won't
    00599        * 'connect' with the other piece. */
    00600       AddTrackToSignalBuffer(tile, TRACK_X, owner);
    00601       AddTrackToSignalBuffer(tile, TRACK_Y, owner);
    00602       YapfNotifyTrackLayoutChange(tile, TRACK_X);
    00603       YapfNotifyTrackLayoutChange(tile, TRACK_Y);
    00604     } else {
    00605       AddTrackToSignalBuffer(tile, track, owner);
    00606       YapfNotifyTrackLayoutChange(tile, track);
    00607     }
    00608
    00609     if (v != NULL) TryPathReserve(v, true);
    00610   }
    00611
    00612   return cost;
    00613 }
    00614
    00615
    00623 bool FloodHalftile(TileIndex t)
    00624 {
    00625   assert(IsPlainRailTile(t));
    00626
    00627   bool flooded = false;
    00628   if (GetRailGroundType(t) == RAIL_GROUND_WATER) return flooded;
    00629
    00630   Slope tileh = GetTileSlope(t, NULL);
    00631   TrackBits rail_bits = GetTrackBits(t);
    00632
    00633   if (IsSlopeWithOneCornerRaised(tileh)) {
    00634     TrackBits lower_track = CornerToTrackBits(OppositeCorner(GetHighestSlopeCorner(tileh)));
    00635
    00636     TrackBits to_remove = lower_track & rail_bits;
    00637     if (to_remove != 0) {
    00638       _current_company = OWNER_WATER;
    00639       if (DoCommand(t, 0, FIND_FIRST_BIT(to_remove), DC_EXEC, CMD_REMOVE_SINGLE_RAIL).Failed()) return flooded; // not yet floodable
    00640       flooded = true;
    00641       rail_bits = rail_bits & ~to_remove;
    00642       if (rail_bits == 0) {
    00643         MakeShore(t);
    00644         MarkTileDirtyByTile(t);
    00645         return flooded;
    00646       }
    00647     }
    00648
    00649     if (IsNonContinuousFoundation(GetRailFoundation(tileh, rail_bits))) {
    00650       flooded = true;
    00651       SetRailGroundType(t, RAIL_GROUND_WATER);
    00652       MarkTileDirtyByTile(t);
    00653     }
    00654   } else {
    00655     /* Make shore on steep slopes and 'three-corners-raised'-slopes. */
    00656     if (ApplyFoundationToSlope(GetRailFoundation(tileh, rail_bits), &tileh) == 0) {
    00657       if (IsSteepSlope(tileh) || IsSlopeWithThreeCornersRaised(tileh)) {
    00658         flooded = true;
    00659         SetRailGroundType(t, RAIL_GROUND_WATER);
    00660         MarkTileDirtyByTile(t);
    00661       }
    00662     }
    00663   }
    00664   return flooded;
    00665 }
    00666
    00667 static const TileIndexDiffC _trackdelta[] = {
    00668   { -1,  0 }, {  0,  1 }, { -1,  0 }, {  0,  1 }, {  1,  0 }, {  0,  1 },
    00669   {  0,  0 },
    00670   {  0,  0 },
    00671   {  1,  0 }, {  0, -1 }, {  0, -1 }, {  1,  0 }, {  0, -1 }, { -1,  0 },
    00672   {  0,  0 },
    00673   {  0,  0 }
    00674 };
    00675
    00676
    00677 static CommandCost ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)
    00678 {
    00679   int x = TileX(start);
    00680   int y = TileY(start);
    00681   int ex = TileX(end);
    00682   int ey = TileY(end);
    00683
    00684   if (!ValParamTrackOrientation(TrackdirToTrack(*trackdir))) return CMD_ERROR;
    00685
    00686   /* calculate delta x,y from start to end tile */
    00687   int dx = ex - x;
    00688   int dy = ey - y;
    00689
    00690   /* calculate delta x,y for the first direction */
    00691   int trdx = _trackdelta[*trackdir].x;
    00692   int trdy = _trackdelta[*trackdir].y;
    00693
    00694   if (!IsDiagonalTrackdir(*trackdir)) {
    00695     trdx += _trackdelta[*trackdir ^ 1].x;
    00696     trdy += _trackdelta[*trackdir ^ 1].y;
    00697   }
    00698
    00699   /* validate the direction */
    00700   while (
    00701     (trdx <= 0 && dx > 0) ||
    00702     (trdx >= 0 && dx < 0) ||
    00703     (trdy <= 0 && dy > 0) ||
    00704     (trdy >= 0 && dy < 0)
    00705   ) {
    00706     if (!HasBit(*trackdir, 3)) { // first direction is invalid, try the other
    00707       SetBit(*trackdir, 3); // reverse the direction
    00708       trdx = -trdx;
    00709       trdy = -trdy;
    00710     } else { // other direction is invalid too, invalid drag
    00711       return CMD_ERROR;
    00712     }
    00713   }
    00714
    00715   /* (for diagonal tracks, this is already made sure of by above test), but:
    00716    * for non-diagonal tracks, check if the start and end tile are on 1 line */
    00717   if (!IsDiagonalTrackdir(*trackdir)) {
    00718     trdx = _trackdelta[*trackdir].x;
    00719     trdy = _trackdelta[*trackdir].y;
    00720     if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx))
    00721       return CMD_ERROR;
    00722   }
    00723
    00724   return CommandCost();
    00725 }
    00726
    00739 static CommandCost CmdRailTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00740 {
    00741   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
    00742   Track track = (Track)GB(p2, 4, 3);
    00743   bool remove = HasBit(p2, 7);
    00744   RailType railtype = (RailType)GB(p2, 0, 4);
    00745
    00746   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
    00747   if (p1 >= MapSize()) return CMD_ERROR;
    00748   TileIndex end_tile = p1;
    00749   Trackdir trackdir = TrackToTrackdir(track);
    00750
    00751   if (ValidateAutoDrag(&trackdir, tile, end_tile).Failed()) return CMD_ERROR;
    00752
    00753   if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, tile);
    00754
    00755   for (;;) {
    00756     ret = DoCommand(tile, railtype, TrackdirToTrack(trackdir), flags, remove ? CMD_REMOVE_SINGLE_RAIL : CMD_BUILD_SINGLE_RAIL);
    00757
    00758     if (ret.Failed()) {
    00759       if (_error_message != STR_ERROR_ALREADY_BUILT && !remove) {
    00760         if (HasBit(p2, 8)) return CMD_ERROR;
    00761         break;
    00762       }
    00763       _error_message = INVALID_STRING_ID;
    00764     } else {
    00765       total_cost.AddCost(ret);
    00766     }
    00767
    00768     if (tile == end_tile) break;
    00769
    00770     tile += ToTileIndexDiff(_trackdelta[trackdir]);
    00771
    00772     /* toggle railbit for the non-diagonal tracks */
    00773     if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
    00774   }
    00775
    00776   return (total_cost.GetCost() == 0) ? CommandCost(remove ? INVALID_STRING_ID : (_error_message == INVALID_STRING_ID ? STR_ERROR_ALREADY_BUILT : _error_message)) : total_cost;
    00777 }
    00778
    00792 CommandCost CmdBuildRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00793 {
    00794   return CmdRailTrackHelper(tile, flags, p1, ClrBit(p2, 7), text);
    00795 }
    00796
    00810 CommandCost CmdRemoveRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00811 {
    00812   return CmdRailTrackHelper(tile, flags, p1, SetBit(p2, 7), text);
    00813 }
    00814
    00826 CommandCost CmdBuildTrainDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00827 {
    00828   /* check railtype and valid direction for depot (0 through 3), 4 in total */
    00829   if (!ValParamRailtype((RailType)p1)) return CMD_ERROR;
    00830
    00831   Slope tileh = GetTileSlope(tile, NULL);
    00832
    00833   DiagDirection dir = Extract<DiagDirection, 0>(p2);
    00834
    00835   /* Prohibit construction if
    00836    * The tile is non-flat AND
    00837    * 1) build-on-slopes is disabled
    00838    * 2) the tile is steep i.e. spans two height levels
    00839    * 3) the exit points in the wrong direction
    00840    */
    00841
    00842   if (tileh != SLOPE_FLAT && (
    00843         !_settings_game.construction.build_on_slopes ||
    00844         IsSteepSlope(tileh) ||
    00845         !CanBuildDepotByTileh(dir, tileh)
    00846       )) {
    00847     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
    00848   }
    00849
    00850   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00851   if (cost.Failed()) return CMD_ERROR;
    00852
    00853   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
    00854
    00855   if (!Depot::CanAllocateItem()) return CMD_ERROR;
    00856
    00857   if (flags & DC_EXEC) {
    00858     Depot *d = new Depot(tile);
    00859     d->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
    00860
    00861     MakeRailDepot(tile, _current_company, d->index, dir, (RailType)p1);
    00862     MarkTileDirtyByTile(tile);
    00863
    00864     AddSideToSignalBuffer(tile, INVALID_DIAGDIR, _current_company);
    00865     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
    00866   }
    00867
    00868   cost.AddCost(_price[PR_BUILD_DEPOT_TRAIN]);
    00869   return cost;
    00870 }
    00871
    00892 CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00893 {
    00894   Track track = (Track)GB(p1, 0, 3);
    00895   bool ctrl_pressed = HasBit(p1, 3); // was the CTRL button pressed
    00896   SignalVariant sigvar = (ctrl_pressed ^ HasBit(p1, 4)) ? SIG_SEMAPHORE : SIG_ELECTRIC; // the signal variant of the new signal
    00897   SignalType sigtype = (SignalType)GB(p1, 5, 3); // the signal type of the new signal
    00898   bool convert_signal = HasBit(p1, 8); // convert button pressed
    00899   SignalType cycle_start = (SignalType)GB(p1, 9, 3);
    00900   SignalType cycle_stop = (SignalType)GB(p1, 12, 3);
    00901   uint num_dir_cycle = GB(p1, 15, 2);
    00902
    00903   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
    00904
    00905   /* You can only build signals on plain rail tiles, and the selected track must exist */
    00906   if (!ValParamTrackOrientation(track) || !IsPlainRailTile(tile) ||
    00907       !HasTrack(tile, track) || !EnsureNoTrainOnTrack(tile, track)) {
    00908     return CMD_ERROR;
    00909   }
    00910
    00911   /* Protect against invalid signal copying */
    00912   if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
    00913
    00914   if (!CheckTileOwnership(tile)) return CMD_ERROR;
    00915
    00916   {
    00917     /* See if this is a valid track combination for signals, (ie, no overlap) */
    00918     TrackBits trackbits = GetTrackBits(tile);
    00919     if (KillFirstBit(trackbits) != TRACK_BIT_NONE && // More than one track present
    00920         trackbits != TRACK_BIT_HORZ &&
    00921         trackbits != TRACK_BIT_VERT) {
    00922       return_cmd_error(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK);
    00923     }
    00924   }
    00925
    00926   /* In case we don't want to change an existing signal, return without error. */
    00927   if (HasBit(p1, 17) && HasSignalOnTrack(tile, track)) return CommandCost();
    00928
    00929   /* you can not convert a signal if no signal is on track */
    00930   if (convert_signal && !HasSignalOnTrack(tile, track)) return CMD_ERROR;
    00931
    00932   CommandCost cost;
    00933   if (!HasSignalOnTrack(tile, track)) {
    00934     /* build new signals */
    00935     cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS]);
    00936   } else {
    00937     if (p2 != 0 && sigvar != GetSignalVariant(tile, track)) {
    00938       /* convert signals <-> semaphores */
    00939       cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
    00940
    00941     } else if (convert_signal) {
    00942       /* convert button pressed */
    00943       if (ctrl_pressed || GetSignalVariant(tile, track) != sigvar) {
    00944         /* convert electric <-> semaphore */
    00945         cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
    00946       } else {
    00947         /* it is free to change signal type: normal-pre-exit-combo */
    00948         cost = CommandCost();
    00949       }
    00950
    00951     } else {
    00952       /* it is free to change orientation/pre-exit-combo signals */
    00953       cost = CommandCost();
    00954     }
    00955   }
    00956
    00957   if (flags & DC_EXEC) {
    00958     Train *v = NULL;
    00959     /* The new/changed signal could block our path. As this can lead to
    00960      * stale reservations, we clear the path reservation here and try
    00961      * to redo it later on. */
    00962     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
    00963       v = GetTrainForReservation(tile, track);
    00964       if (v != NULL) FreeTrainTrackReservation(v);
    00965     }
    00966
    00967     if (!HasSignals(tile)) {
    00968       /* there are no signals at all on this tile yet */
    00969       SetHasSignals(tile, true);
    00970       SetSignalStates(tile, 0xF); // all signals are on
    00971       SetPresentSignals(tile, 0); // no signals built by default
    00972       SetSignalType(tile, track, sigtype);
    00973       SetSignalVariant(tile, track, sigvar);
    00974     }
    00975
    00976     if (p2 == 0) {
    00977       if (!HasSignalOnTrack(tile, track)) {
    00978         /* build new signals */
    00979         SetPresentSignals(tile, GetPresentSignals(tile) | (IsPbsSignal(sigtype) ? KillFirstBit(SignalOnTrack(track)) : SignalOnTrack(track)));
    00980         SetSignalType(tile, track, sigtype);
    00981         SetSignalVariant(tile, track, sigvar);
    00982         while (num_dir_cycle-- > 0) CycleSignalSide(tile, track);
    00983       } else {
    00984         if (convert_signal) {
    00985           /* convert signal button pressed */
    00986           if (ctrl_pressed) {
    00987             /* toggle the pressent signal variant: SIG_ELECTRIC <-> SIG_SEMAPHORE */
    00988             SetSignalVariant(tile, track, (GetSignalVariant(tile, track) == SIG_ELECTRIC) ? SIG_SEMAPHORE : SIG_ELECTRIC);
    00989             /* Query current signal type so the check for PBS signals below works. */
    00990             sigtype = GetSignalType(tile, track);
    00991           } else {
    00992             /* convert the present signal to the chosen type and variant */
    00993             SetSignalType(tile, track, sigtype);
    00994             SetSignalVariant(tile, track, sigvar);
    00995             if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
    00996               SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
    00997             }
    00998           }
    00999
    01000         } else if (ctrl_pressed) {
    01001           /* cycle between cycle_start and cycle_end */
    01002           sigtype = (SignalType)(GetSignalType(tile, track) + 1);
    01003
    01004           if (sigtype < cycle_start || sigtype > cycle_stop) sigtype = cycle_start;
    01005
    01006           SetSignalType(tile, track, sigtype);
    01007           if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
    01008             SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
    01009           }
    01010         } else {
    01011           /* cycle the signal side: both -> left -> right -> both -> ... */
    01012           CycleSignalSide(tile, track);
    01013           /* Query current signal type so the check for PBS signals below works. */
    01014           sigtype = GetSignalType(tile, track);
    01015         }
    01016       }
    01017     } else {
    01018       /* If CmdBuildManySignals is called with copying signals, just copy the
    01019        * direction of the first signal given as parameter by CmdBuildManySignals */
    01020       SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | (p2 & SignalOnTrack(track)));
    01021       SetSignalVariant(tile, track, sigvar);
    01022       SetSignalType(tile, track, sigtype);
    01023     }
    01024
    01025     if (IsPbsSignal(sigtype)) {
    01026       /* PBS signals should show red unless they are on a reservation. */
    01027       uint mask = GetPresentSignals(tile) & SignalOnTrack(track);
    01028       SetSignalStates(tile, (GetSignalStates(tile) & ~mask) | ((HasBit(GetRailReservationTrackBits(tile), track) ? UINT_MAX : 0) & mask));
    01029     }
    01030     MarkTileDirtyByTile(tile);
    01031     AddTrackToSignalBuffer(tile, track, _current_company);
    01032     YapfNotifyTrackLayoutChange(tile, track);
    01033     if (v != NULL) {
    01034       /* Extend the train's path if it's not stopped or loading, or not at a safe position. */
    01035       if (!(((v->vehstatus & VS_STOPPED) && v->cur_speed == 0) || v->current_order.IsType(OT_LOADING)) ||
    01036           !IsSafeWaitingPosition(v, v->tile, v->GetVehicleTrackdir(), true, _settings_game.pf.forbid_90_deg)) {
    01037         TryPathReserve(v, true);
    01038       }
    01039     }
    01040   }
    01041
    01042   return cost;
    01043 }
    01044
    01045 static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
    01046 {
    01047   tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
    01048   if (tile == INVALID_TILE) return false;
    01049
    01050   /* Check for track bits on the new tile */
    01051   TrackdirBits trackdirbits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
    01052
    01053   if (TracksOverlap(TrackdirBitsToTrackBits(trackdirbits))) return false;
    01054   trackdirbits &= TrackdirReachesTrackdirs(trackdir);
    01055
    01056   /* No track bits, must stop */
    01057   if (trackdirbits == TRACKDIR_BIT_NONE) return false;
    01058
    01059   /* Get the first track dir */
    01060   trackdir = RemoveFirstTrackdir(&trackdirbits);
    01061
    01062   /* Any left? It's a junction so we stop */
    01063   if (trackdirbits != TRACKDIR_BIT_NONE) return false;
    01064
    01065   switch (GetTileType(tile)) {
    01066     case MP_RAILWAY:
    01067       if (IsRailDepot(tile)) return false;
    01068       if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
    01069       signal_ctr++;
    01070       if (IsDiagonalTrackdir(trackdir)) {
    01071         signal_ctr++;
    01072         /* Ensure signal_ctr even so X and Y pieces get signals */
    01073         ClrBit(signal_ctr, 0);
    01074       }
    01075       return true;
    01076
    01077     case MP_ROAD:
    01078       if (!IsLevelCrossing(tile)) return false;
    01079       signal_ctr += 2;
    01080       return true;
    01081
    01082     case MP_TUNNELBRIDGE: {
    01083       TileIndex orig_tile = tile; // backup old value
    01084
    01085       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
    01086       if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
    01087
    01088       /* Skip to end of tunnel or bridge
    01089        * note that tile is a parameter by reference, so it must be updated */
    01090       tile = GetOtherTunnelBridgeEnd(tile);
    01091
    01092       signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
    01093       return true;
    01094     }
    01095
    01096     default: return false;
    01097   }
    01098 }
    01099
    01115 static CommandCost CmdSignalTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01116 {
    01117   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
    01118   bool err = true;
    01119   TileIndex start_tile = tile;
    01120
    01121   Track track = (Track)GB(p2, 0, 3);
    01122   bool mode = HasBit(p2, 3);
    01123   bool semaphores = HasBit(p2, 4);
    01124   bool remove = HasBit(p2, 5);
    01125   bool autofill = HasBit(p2, 6);
    01126   Trackdir trackdir = TrackToTrackdir(track);
    01127   byte signal_density = GB(p2, 24, 8);
    01128
    01129   if (p1 >= MapSize()) return CMD_ERROR;
    01130   TileIndex end_tile = p1;
    01131   if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
    01132
    01133   if (!IsPlainRailTile(tile)) return CMD_ERROR;
    01134
    01135   /* for vertical/horizontal tracks, double the given signals density
    01136    * since the original amount will be too dense (shorter tracks) */
    01137   signal_density *= 2;
    01138
    01139   if (ValidateAutoDrag(&trackdir, tile, end_tile).Failed()) return CMD_ERROR;
    01140
    01141   track = TrackdirToTrack(trackdir); // trackdir might have changed, keep track in sync
    01142   Trackdir start_trackdir = trackdir;
    01143
    01144   /* Must start on a valid track to be able to avoid loops */
    01145   if (!HasTrack(tile, track)) return CMD_ERROR;
    01146
    01147   SignalType sigtype = (SignalType)GB(p2, 7, 3);
    01148   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
    01149
    01150   byte signals;
    01151   /* copy the signal-style of the first rail-piece if existing */
    01152   if (HasSignalOnTrack(tile, track)) {
    01153     signals = GetPresentSignals(tile) & SignalOnTrack(track);
    01154     assert(signals != 0);
    01155
    01156     /* copy signal/semaphores style (independent of CTRL) */
    01157     semaphores = GetSignalVariant(tile, track) != SIG_ELECTRIC;
    01158
    01159     sigtype = GetSignalType(tile, track);
    01160     /* Don't but copy pre-signal type */
    01161     if (sigtype < SIGTYPE_PBS) sigtype = SIGTYPE_NORMAL;
    01162   } else { // no signals exist, drag a two-way signal stretch
    01163     signals = IsPbsSignal(sigtype) ? SignalAlongTrackdir(trackdir) : SignalOnTrack(track);
    01164   }
    01165
    01166   byte signal_dir = 0;
    01167   if (signals & SignalAlongTrackdir(trackdir))   SetBit(signal_dir, 0);
    01168   if (signals & SignalAgainstTrackdir(trackdir)) SetBit(signal_dir, 1);
    01169
    01170   /* signal_ctr         - amount of tiles already processed
    01171    * signals_density    - setting to put signal on every Nth tile (double space on |, -- tracks)
    01172    **********
    01173    * trackdir   - trackdir to build with autorail
    01174    * semaphores - semaphores or signals
    01175    * signals    - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
    01176    *              and convert all others to semaphore/signal
    01177    * remove     - 1 remove signals, 0 build signals */
    01178   int signal_ctr = 0;
    01179   for (;;) {
    01180     /* only build/remove signals with the specified density */
    01181     if ((remove && autofill) || signal_ctr % signal_density == 0) {
    01182       uint32 p1 = GB(TrackdirToTrack(trackdir), 0, 3);
    01183       SB(p1, 3, 1, mode);
    01184       SB(p1, 4, 1, semaphores);
    01185       SB(p1, 5, 3, sigtype);
    01186       if (!remove && signal_ctr == 0) SetBit(p1, 17);
    01187
    01188       /* Pick the correct orientation for the track direction */
    01189       signals = 0;
    01190       if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
    01191       if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
    01192
    01193       ret = DoCommand(tile, p1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
    01194
    01195       /* Be user-friendly and try placing signals as much as possible */
    01196       if (ret.Succeeded()) {
    01197         err = false;
    01198         total_cost.AddCost(ret);
    01199       }
    01200     }
    01201
    01202     if (autofill) {
    01203       if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
    01204
    01205       /* Prevent possible loops */
    01206       if (tile == start_tile && trackdir == start_trackdir) break;
    01207     } else {
    01208       if (tile == end_tile) break;
    01209
    01210       tile += ToTileIndexDiff(_trackdelta[trackdir]);
    01211       signal_ctr++;
    01212
    01213       /* toggle railbit for the non-diagonal tracks (|, -- tracks) */
    01214       if (IsDiagonalTrackdir(trackdir)) {
    01215         signal_ctr++;
    01216       } else {
    01217         ToggleBit(trackdir, 0);
    01218       }
    01219     }
    01220   }
    01221
    01222   return err ? CMD_ERROR : total_cost;
    01223 }
    01224
    01242 CommandCost CmdBuildSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01243 {
    01244   return CmdSignalTrackHelper(tile, flags, p1, p2, text);
    01245 }
    01246
    01258 CommandCost CmdRemoveSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01259 {
    01260   Track track = (Track)GB(p1, 0, 3);
    01261
    01262   if (!ValParamTrackOrientation(track) ||
    01263       !IsPlainRailTile(tile) ||
    01264       !HasTrack(tile, track) ||
    01265       !EnsureNoTrainOnTrack(tile, track) ||
    01266       !HasSignalOnTrack(tile, track)) {
    01267     return CMD_ERROR;
    01268   }
    01269
    01270   /* Only water can remove signals from anyone */
    01271   if (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) return CMD_ERROR;
    01272
    01273   /* Do it? */
    01274   if (flags & DC_EXEC) {
    01275     Train *v = NULL;
    01276     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
    01277       v = GetTrainForReservation(tile, track);
    01278     } else if (IsPbsSignal(GetSignalType(tile, track))) {
    01279       /* PBS signal, might be the end of a path reservation. */
    01280       Trackdir td = TrackToTrackdir(track);
    01281       for (int i = 0; v == NULL && i < 2; i++, td = ReverseTrackdir(td)) {
    01282         /* Only test the active signal side. */
    01283         if (!HasSignalOnTrackdir(tile, ReverseTrackdir(td))) continue;
    01284         TileIndex next = TileAddByDiagDir(tile, TrackdirToExitdir(td));
    01285         TrackBits tracks = TrackdirBitsToTrackBits(TrackdirReachesTrackdirs(td));
    01286         if (HasReservedTracks(next, tracks)) {
    01287           v = GetTrainForReservation(next, TrackBitsToTrack(GetReservedTrackbits(next) & tracks));
    01288         }
    01289       }
    01290     }
    01291     SetPresentSignals(tile, GetPresentSignals(tile) & ~SignalOnTrack(track));
    01292
    01293     /* removed last signal from tile? */
    01294     if (GetPresentSignals(tile) == 0) {
    01295       SetSignalStates(tile, 0);
    01296       SetHasSignals(tile, false);
    01297       SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
    01298     }
    01299
    01300     AddTrackToSignalBuffer(tile, track, GetTileOwner(tile));
    01301     YapfNotifyTrackLayoutChange(tile, track);
    01302     if (v != NULL) TryPathReserve(v, false);
    01303
    01304     MarkTileDirtyByTile(tile);
    01305   }
    01306
    01307   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_SIGNALS]);
    01308 }
    01309
    01327 CommandCost CmdRemoveSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01328 {
    01329   return CmdSignalTrackHelper(tile, flags, p1, SetBit(p2, 5), text); // bit 5 is remove bit
    01330 }
    01331
    01333 static Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
    01334 {
    01335   if (v->type != VEH_TRAIN) return NULL;
    01336
    01337   /* Similar checks as in Train::PowerChanged() */
    01338
    01339   Train *t = Train::From(v);
    01340   if (t->IsArticulatedPart()) return NULL;
    01341
    01342   const RailVehicleInfo *rvi = RailVehInfo(t->engine_type);
    01343   if (GetVehicleProperty(t, PROP_TRAIN_POWER, rvi->power) != 0) t->First()->PowerChanged();
    01344
    01345   return NULL;
    01346 }
    01347
    01357 CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01358 {
    01359   CommandCost cost(EXPENSES_CONSTRUCTION);
    01360   RailType totype = (RailType)p2;
    01361
    01362   if (!ValParamRailtype(totype)) return CMD_ERROR;
    01363   if (p1 >= MapSize()) return CMD_ERROR;
    01364
    01365   uint ex = TileX(tile);
    01366   uint ey = TileY(tile);
    01367   uint sx = TileX(p1);
    01368   uint sy = TileY(p1);
    01369
    01370   /* make sure sx,sy are smaller than ex,ey */
    01371   if (ex < sx) Swap(ex, sx);
    01372   if (ey < sy) Swap(ey, sy);
    01373
    01374   _error_message = STR_ERROR_NO_SUITABLE_RAILROAD_TRACK; // by default, there is no track to convert
    01375
    01376   for (uint x = sx; x <= ex; ++x) {
    01377     for (uint y = sy; y <= ey; ++y) {
    01378       TileIndex tile = TileXY(x, y);
    01379       TileType tt = GetTileType(tile);
    01380
    01381       /* Check if there is any track on tile */
    01382       switch (tt) {
    01383         case MP_RAILWAY:
    01384           break;
    01385         case MP_STATION:
    01386           if (!HasStationRail(tile)) continue;
    01387           break;
    01388         case MP_ROAD:
    01389           if (!IsLevelCrossing(tile)) continue;
    01390           break;
    01391         case MP_TUNNELBRIDGE:
    01392           if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
    01393           break;
    01394         default: continue;
    01395       }
    01396
    01397       /* Original railtype we are converting from */
    01398       RailType type = GetRailType(tile);
    01399
    01400       /* Converting to the same type or converting 'hidden' elrail -> rail */
    01401       if (type == totype || (_settings_game.vehicle.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
    01402
    01403       /* Trying to convert other's rail */
    01404       if (!CheckTileOwnership(tile)) continue;
    01405
    01406       SmallVector<Train *, 2> vehicles_affected;
    01407
    01408       /* Vehicle on the tile when not converting Rail <-> ElRail
    01409        * Tunnels and bridges have special check later */
    01410       if (tt != MP_TUNNELBRIDGE) {
    01411         if (!IsCompatibleRail(type, totype) && !EnsureNoVehicleOnGround(tile)) continue;
    01412         if (flags & DC_EXEC) { // we can safely convert, too
    01413           TrackBits reserved = GetReservedTrackbits(tile);
    01414           Track     track;
    01415           while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
    01416             Train *v = GetTrainForReservation(tile, track);
    01417             if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
    01418               /* No power on new rail type, reroute. */
    01419               FreeTrainTrackReservation(v);
    01420               *vehicles_affected.Append() = v;
    01421             }
    01422           }
    01423
    01424           SetRailType(tile, totype);
    01425           MarkTileDirtyByTile(tile);
    01426           /* update power of train engines on this tile */
    01427           FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
    01428         }
    01429       }
    01430
    01431       switch (tt) {
    01432         case MP_RAILWAY:
    01433           switch (GetRailTileType(tile)) {
    01434             case RAIL_TILE_DEPOT:
    01435               if (flags & DC_EXEC) {
    01436                 /* notify YAPF about the track layout change */
    01437                 YapfNotifyTrackLayoutChange(tile, GetRailDepotTrack(tile));
    01438
    01439                 /* Update build vehicle window related to this depot */
    01440                 InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
    01441                 InvalidateWindowData(WC_BUILD_VEHICLE, tile);
    01442               }
    01443               cost.AddCost(RailConvertCost(type, totype));
    01444               break;
    01445
    01446             default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
    01447               if (flags & DC_EXEC) {
    01448                 /* notify YAPF about the track layout change */
    01449                 TrackBits tracks = GetTrackBits(tile);
    01450                 while (tracks != TRACK_BIT_NONE) {
    01451                   YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
    01452                 }
    01453               }
    01454               cost.AddCost(RailConvertCost(type, totype) * CountBits(GetTrackBits(tile)));
    01455               break;
    01456           }
    01457           break;
    01458
    01459         case MP_TUNNELBRIDGE: {
    01460           TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
    01461
    01462           /* If both ends of tunnel/bridge are in the range, do not try to convert twice -
    01463            * it would cause assert because of different test and exec runs */
    01464           if (endtile < tile && TileX(endtile) >= sx && TileX(endtile) <= ex &&
    01465               TileY(endtile) >= sy && TileY(endtile) <= ey) continue;
    01466
    01467           /* When not coverting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
    01468           if (!IsCompatibleRail(GetRailType(tile), totype) &&
    01469               HasVehicleOnTunnelBridge(tile, endtile)) continue;
    01470
    01471           if (flags & DC_EXEC) {
    01472             Track track = DiagDirToDiagTrack(GetTunnelBridgeDirection(tile));
    01473             if (HasTunnelBridgeReservation(tile)) {
    01474               Train *v = GetTrainForReservation(tile, track);
    01475               if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
    01476                 /* No power on new rail type, reroute. */
    01477                 FreeTrainTrackReservation(v);
    01478                 *vehicles_affected.Append() = v;
    01479               }
    01480             }
    01481             SetRailType(tile, totype);
    01482             SetRailType(endtile, totype);
    01483
    01484             FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
    01485             FindVehicleOnPos(endtile, NULL, &UpdateTrainPowerProc);
    01486
    01487             YapfNotifyTrackLayoutChange(tile, track);
    01488             YapfNotifyTrackLayoutChange(endtile, track);
    01489
    01490             MarkTileDirtyByTile(tile);
    01491             MarkTileDirtyByTile(endtile);
    01492
    01493             if (IsBridge(tile)) {
    01494               TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
    01495               TileIndex t = tile + delta;
    01496               for (; t != endtile; t += delta) MarkTileDirtyByTile(t); // TODO encapsulate this into a function
    01497             }
    01498           }
    01499
    01500           cost.AddCost((GetTunnelBridgeLength(tile, endtile) + 2) * RailConvertCost(type, totype));
    01501         } break;
    01502
    01503         default: // MP_STATION, MP_ROAD
    01504           if (flags & DC_EXEC) {
    01505             Track track = ((tt == MP_STATION) ? GetRailStationTrack(tile) : GetCrossingRailTrack(tile));
    01506             YapfNotifyTrackLayoutChange(tile, track);
    01507           }
    01508
    01509           cost.AddCost(RailConvertCost(type, totype));
    01510           break;
    01511       }
    01512
    01513       for (uint i = 0; i < vehicles_affected.Length(); ++i) {
    01514         TryPathReserve(vehicles_affected[i], true);
    01515       }
    01516     }
    01517   }
    01518
    01519   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
    01520 }
    01521
    01522 static CommandCost RemoveTrainDepot(TileIndex tile, DoCommandFlag flags)
    01523 {
    01524   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER)
    01525     return CMD_ERROR;
    01526
    01527   if (!EnsureNoVehicleOnGround(tile))
    01528     return CMD_ERROR;
    01529
    01530   if (flags & DC_EXEC) {
    01531     /* read variables before the depot is removed */
    01532     DiagDirection dir = GetRailDepotDirection(tile);
    01533     Owner owner = GetTileOwner(tile);
    01534     Train *v = NULL;
    01535
    01536     if (HasDepotReservation(tile)) {
    01537       v = GetTrainForReservation(tile, DiagDirToDiagTrack(dir));
    01538       if (v != NULL) FreeTrainTrackReservation(v);
    01539     }
    01540
    01541     delete Depot::GetByTile(tile);
    01542     DoClearSquare(tile);
    01543     AddSideToSignalBuffer(tile, dir, owner);
    01544     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
    01545     if (v != NULL) TryPathReserve(v, true);
    01546   }
    01547
    01548   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_TRAIN]);
    01549 }
    01550
    01551 static CommandCost ClearTile_Track(TileIndex tile, DoCommandFlag flags)
    01552 {
    01553   CommandCost cost(EXPENSES_CONSTRUCTION);
    01554
    01555   if (flags & DC_AUTO) {
    01556     if (!IsTileOwner(tile, _current_company)) {
    01557       return_cmd_error(STR_ERROR_AREA_IS_OWNED_BY_ANOTHER);
    01558     }
    01559
    01560     if (IsPlainRail(tile)) {
    01561       return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
    01562     } else {
    01563       return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
    01564     }
    01565   }
    01566
    01567   switch (GetRailTileType(tile)) {
    01568     case RAIL_TILE_SIGNALS:
    01569     case RAIL_TILE_NORMAL: {
    01570       Slope tileh = GetTileSlope(tile, NULL);
    01571       /* Is there flat water on the lower halftile, that gets cleared expensively? */
    01572       bool water_ground = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh));
    01573
    01574       TrackBits tracks = GetTrackBits(tile);
    01575       while (tracks != TRACK_BIT_NONE) {
    01576         Track track = RemoveFirstTrack(&tracks);
    01577         CommandCost ret = DoCommand(tile, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
    01578         if (ret.Failed()) return CMD_ERROR;
    01579         cost.AddCost(ret);
    01580       }
    01581
    01582       /* when bankrupting, don't make water dirty, there could be a ship on lower halftile */
    01583       if (water_ground && !(flags & DC_BANKRUPT)) {
    01584         if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    01585
    01586         /* The track was removed, and left a coast tile. Now also clear the water. */
    01587         if (flags & DC_EXEC) DoClearSquare(tile);
    01588         cost.AddCost(_price[PR_CLEAR_WATER]);
    01589       }
    01590
    01591       return cost;
    01592     }
    01593
    01594     case RAIL_TILE_DEPOT:
    01595       return RemoveTrainDepot(tile, flags);
    01596
    01597     default:
    01598       return CMD_ERROR;
    01599   }
    01600 }
    01601
    01606 static uint GetSaveSlopeZ(uint x, uint y, Track track)
    01607 {
    01608   switch (track) {
    01609     case TRACK_UPPER: x &= ~0xF; y &= ~0xF; break;
    01610     case TRACK_LOWER: x |=  0xF; y |=  0xF; break;
    01611     case TRACK_LEFT:  x |=  0xF; y &= ~0xF; break;
    01612     case TRACK_RIGHT: x &= ~0xF; y |=  0xF; break;
    01613     default: break;
    01614   }
    01615   return GetSlopeZ(x, y);
    01616 }
    01617
    01618 static void DrawSingleSignal(TileIndex tile, Track track, byte condition, uint image, uint pos)
    01619 {
    01620   bool side = (_settings_game.vehicle.road_side != 0) && _settings_game.construction.signal_side;
    01621   static const Point SignalPositions[2][12] = {
    01622     { // Signals on the left side
    01623     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01624       { 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
    01625     /*  LOWER     LOWER     X         X         Y         Y     */
    01626       {11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
    01627     }, { // Signals on the right side
    01628     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01629       {14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
    01630     /*  LOWER     LOWER     X         X         Y         Y     */
    01631       {14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
    01632     }
    01633   };
    01634
    01635   uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
    01636   uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
    01637
    01638   SpriteID sprite;
    01639
    01640   SignalType type       = GetSignalType(tile, track);
    01641   SignalVariant variant = GetSignalVariant(tile, track);
    01642
    01643   if (type == SIGTYPE_NORMAL && variant == SIG_ELECTRIC) {
    01644     /* Normal electric signals are picked from original sprites. */
    01645     sprite = SPR_ORIGINAL_SIGNALS_BASE + image + condition;
    01646   } else {
    01647     /* All other signals are picked from add on sprites. */
    01648     sprite = SPR_SIGNALS_BASE + (type - 1) * 16 + variant * 64 + image + condition + (type > SIGTYPE_LAST_NOPBS ? 64 : 0);
    01649   }
    01650
    01651   AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, GetSaveSlopeZ(x, y, track));
    01652 }
    01653
    01654 static uint32 _drawtile_track_palette;
    01655
    01656
    01657 static void DrawTrackFence_NW(const TileInfo *ti, SpriteID base_image)
    01658 {
    01659   RailFenceOffset rfo = RFO_FLAT_X;
    01660   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
    01661   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01662     ti->x, ti->y + 1, 16, 1, 4, ti->z);
    01663 }
    01664
    01665 static void DrawTrackFence_SE(const TileInfo *ti, SpriteID base_image)
    01666 {
    01667   RailFenceOffset rfo = RFO_FLAT_X;
    01668   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
    01669   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01670     ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
    01671 }
    01672
    01673 static void DrawTrackFence_NW_SE(const TileInfo *ti, SpriteID base_image)
    01674 {
    01675   DrawTrackFence_NW(ti, base_image);
    01676   DrawTrackFence_SE(ti, base_image);
    01677 }
    01678
    01679 static void DrawTrackFence_NE(const TileInfo *ti, SpriteID base_image)
    01680 {
    01681   RailFenceOffset rfo = RFO_FLAT_Y;
    01682   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
    01683   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01684     ti->x + 1, ti->y, 1, 16, 4, ti->z);
    01685 }
    01686
    01687 static void DrawTrackFence_SW(const TileInfo *ti, SpriteID base_image)
    01688 {
    01689   RailFenceOffset rfo = RFO_FLAT_Y;
    01690   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
    01691   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01692     ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
    01693 }
    01694
    01695 static void DrawTrackFence_NE_SW(const TileInfo *ti, SpriteID base_image)
    01696 {
    01697   DrawTrackFence_NE(ti, base_image);
    01698   DrawTrackFence_SW(ti, base_image);
    01699 }
    01700
    01704 static void DrawTrackFence_NS_1(const TileInfo *ti, SpriteID base_image)
    01705 {
    01706   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_W);
    01707   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
    01708     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01709 }
    01710
    01714 static void DrawTrackFence_NS_2(const TileInfo *ti, SpriteID base_image)
    01715 {
    01716   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_E);
    01717   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
    01718     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01719 }
    01720
    01724 static void DrawTrackFence_WE_1(const TileInfo *ti, SpriteID base_image)
    01725 {
    01726   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_N);
    01727   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
    01728     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01729 }
    01730
    01734 static void DrawTrackFence_WE_2(const TileInfo *ti, SpriteID base_image)
    01735 {
    01736   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_S);
    01737   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
    01738     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01739 }
    01740
    01741
    01742 static void DrawTrackDetails(const TileInfo *ti, const RailtypeInfo *rti)
    01743 {
    01744   /* Base sprite for track fences. */
    01745   SpriteID base_image = GetCustomRailSprite(rti, ti->tile, RTSG_FENCES);
    01746   if (base_image == 0) base_image = SPR_TRACK_FENCE_FLAT_X;
    01747
    01748   switch (GetRailGroundType(ti->tile)) {
    01749     case RAIL_GROUND_FENCE_NW:     DrawTrackFence_NW(ti, base_image);    break;
    01750     case RAIL_GROUND_FENCE_SE:     DrawTrackFence_SE(ti, base_image);    break;
    01751     case RAIL_GROUND_FENCE_SENW:   DrawTrackFence_NW_SE(ti, base_image); break;
    01752     case RAIL_GROUND_FENCE_NE:     DrawTrackFence_NE(ti, base_image);    break;
    01753     case RAIL_GROUND_FENCE_SW:     DrawTrackFence_SW(ti, base_image);    break;
    01754     case RAIL_GROUND_FENCE_NESW:   DrawTrackFence_NE_SW(ti, base_image); break;
    01755     case RAIL_GROUND_FENCE_VERT1:  DrawTrackFence_NS_1(ti, base_image);  break;
    01756     case RAIL_GROUND_FENCE_VERT2:  DrawTrackFence_NS_2(ti, base_image);  break;
    01757     case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti, base_image);  break;
    01758     case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti, base_image);  break;
    01759     case RAIL_GROUND_WATER: {
    01760       Corner track_corner;
    01761       if (IsHalftileSlope(ti->tileh)) {
    01762         /* Steep slope or one-corner-raised slope with halftile foundation */
    01763         track_corner = GetHalftileSlopeCorner(ti->tileh);
    01764       } else {
    01765         /* Three-corner-raised slope */
    01766         track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    01767       }
    01768       switch (track_corner) {
    01769         case CORNER_W: DrawTrackFence_NS_1(ti, base_image); break;
    01770         case CORNER_S: DrawTrackFence_WE_2(ti, base_image); break;
    01771         case CORNER_E: DrawTrackFence_NS_2(ti, base_image); break;
    01772         case CORNER_N: DrawTrackFence_WE_1(ti, base_image); break;
    01773         default: NOT_REACHED();
    01774       }
    01775       break;
    01776     }
    01777     default: break;
    01778   }
    01779 }
    01780
    01781 /* SubSprite for drawing the track halftile of 'three-corners-raised'-sloped rail sprites. */
    01782 static const int INF = 1000; // big number compared to tilesprite size
    01783 static const SubSprite _halftile_sub_sprite[4] = {
    01784   { -INF    , -INF  , 32 - 33, INF     }, // CORNER_W, clip 33 pixels from right
    01785   { -INF    ,  0 + 7, INF    , INF     }, // CORNER_S, clip 7 pixels from top
    01786   { -31 + 33, -INF  , INF    , INF     }, // CORNER_E, clip 33 pixels from left
    01787   { -INF    , -INF  , INF    , 30 - 23 }  // CORNER_N, clip 23 pixels from bottom
    01788 };
    01789
    01790 static inline void DrawTrackSprite(SpriteID sprite, PaletteID pal, const TileInfo *ti, Slope s)
    01791 {
    01792   DrawGroundSprite(sprite, pal, NULL, 0, (ti->tileh & s) ? -8 : 0);
    01793 }
    01794
    01795 static void DrawTrackBitsOverlay(TileInfo *ti, TrackBits track, const RailtypeInfo *rti)
    01796 {
    01797   RailGroundType rgt = GetRailGroundType(ti->tile);
    01798   Foundation f = GetRailFoundation(ti->tileh, track);
    01799   Corner halftile_corner = CORNER_INVALID;
    01800
    01801   if (IsNonContinuousFoundation(f)) {
    01802     /* Save halftile corner */
    01803     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
    01804     /* Draw lower part first */
    01805     track &= ~CornerToTrackBits(halftile_corner);
    01806     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
    01807   }
    01808
    01809   DrawFoundation(ti, f);
    01810   /* DrawFoundation modifies ti */
    01811
    01812   /* Draw ground */
    01813   if (track == TRACK_BIT_NONE && rgt == RAIL_GROUND_WATER) {
    01814     if (IsSteepSlope(ti->tileh)) {
    01815       DrawShoreTile(ti->tileh);
    01816     } else {
    01817       DrawGroundSprite(SPR_FLAT_WATER_TILE, PAL_NONE);
    01818     }
    01819   } else {
    01820     SpriteID image;
    01821
    01822     switch (rgt) {
    01823       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01824       case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
    01825       default:                     image = SPR_FLAT_GRASS_TILE; break;
    01826     }
    01827
    01828     image += _tileh_to_sprite[ti->tileh];
    01829
    01830     DrawGroundSprite(image, PAL_NONE);
    01831   }
    01832
    01833   SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
    01834   SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
    01835   TrackBits pbs = _settings_client.gui.show_track_reservation ? GetRailReservationTrackBits(ti->tile) : TRACK_BIT_NONE;
    01836
    01837   if (track == TRACK_BIT_NONE) {
    01838     /* Half-tile foundation, no track here? */
    01839   } else if (ti->tileh == SLOPE_NW && track == TRACK_BIT_Y) {
    01840     DrawGroundSprite(ground + RTO_SLOPE_NW, PAL_NONE);
    01841     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 9, PALETTE_CRASH);
    01842   } else if (ti->tileh == SLOPE_NE && track == TRACK_BIT_X) {
    01843     DrawGroundSprite(ground + RTO_SLOPE_NE, PAL_NONE);
    01844     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 6, PALETTE_CRASH);
    01845   } else if (ti->tileh == SLOPE_SE && track == TRACK_BIT_Y) {
    01846     DrawGroundSprite(ground + RTO_SLOPE_SE, PAL_NONE);
    01847     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 7, PALETTE_CRASH);
    01848   } else if (ti->tileh == SLOPE_SW && track == TRACK_BIT_X) {
    01849     DrawGroundSprite(ground + RTO_SLOPE_SW, PAL_NONE);
    01850     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 8, PALETTE_CRASH);
    01851   } else {
    01852     switch (track) {
    01853       /* Draw single ground sprite when not overlapping. No track overlay
    01854        * is necessary for these sprites. */
    01855       case TRACK_BIT_X:     DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
    01856       case TRACK_BIT_Y:     DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
    01857       case TRACK_BIT_UPPER: DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N); break;
    01858       case TRACK_BIT_LOWER: DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
    01859       case TRACK_BIT_RIGHT: DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E); break;
    01860       case TRACK_BIT_LEFT:  DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
    01861       case TRACK_BIT_CROSS: DrawGroundSprite(ground + RTO_CROSSING_XY, PAL_NONE); break;
    01862       case TRACK_BIT_HORZ:  DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N);
    01863                             DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
    01864       case TRACK_BIT_VERT:  DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E);
    01865                             DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
    01866
    01867       default:
    01868         /* We're drawing a junction tile */
    01869         if ((track & TRACK_BIT_3WAY_NE) == 0) {
    01870           DrawGroundSprite(ground + RTO_JUNCTION_SW, PAL_NONE);
    01871         } else if ((track & TRACK_BIT_3WAY_SW) == 0) {
    01872           DrawGroundSprite(ground + RTO_JUNCTION_NE, PAL_NONE);
    01873         } else if ((track & TRACK_BIT_3WAY_NW) == 0) {
    01874           DrawGroundSprite(ground + RTO_JUNCTION_SE, PAL_NONE);
    01875         } else if ((track & TRACK_BIT_3WAY_SE) == 0) {
    01876           DrawGroundSprite(ground + RTO_JUNCTION_NW, PAL_NONE);
    01877         } else {
    01878           DrawGroundSprite(ground + RTO_JUNCTION_NSEW, PAL_NONE);
    01879         }
    01880
    01881         /* Mask out PBS bits as we shall draw them afterwards anyway. */
    01882         track &= ~pbs;
    01883
    01884         /* Draw regular track bits */
    01885         if (track & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PAL_NONE);
    01886         if (track & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PAL_NONE);
    01887         if (track & TRACK_BIT_UPPER) DrawGroundSprite(overlay + RTO_N, PAL_NONE);
    01888         if (track & TRACK_BIT_LOWER) DrawGroundSprite(overlay + RTO_S, PAL_NONE);
    01889         if (track & TRACK_BIT_RIGHT) DrawGroundSprite(overlay + RTO_E, PAL_NONE);
    01890         if (track & TRACK_BIT_LEFT)  DrawGroundSprite(overlay + RTO_W, PAL_NONE);
    01891     }
    01892
    01893     /* Draw reserved track bits */
    01894     if (pbs & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH);
    01895     if (pbs & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH);
    01896     if (pbs & TRACK_BIT_UPPER) DrawTrackSprite(overlay + RTO_N, PALETTE_CRASH, ti, SLOPE_N);
    01897     if (pbs & TRACK_BIT_LOWER) DrawTrackSprite(overlay + RTO_S, PALETTE_CRASH, ti, SLOPE_S);
    01898     if (pbs & TRACK_BIT_RIGHT) DrawTrackSprite(overlay + RTO_E, PALETTE_CRASH, ti, SLOPE_E);
    01899     if (pbs & TRACK_BIT_LEFT)  DrawTrackSprite(overlay + RTO_W, PALETTE_CRASH, ti, SLOPE_W);
    01900   }
    01901
    01902   if (IsValidCorner(halftile_corner)) {
    01903     DrawFoundation(ti, HalftileFoundation(halftile_corner));
    01904
    01905     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
    01906     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    01907
    01908     SpriteID image;
    01909     switch (rgt) {
    01910       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01911       case RAIL_GROUND_ICE_DESERT:
    01912       case RAIL_GROUND_HALF_SNOW:  image = SPR_FLAT_SNOW_DESERT_TILE; break;
    01913       default:                     image = SPR_FLAT_GRASS_TILE; break;
    01914     }
    01915
    01916     image += _tileh_to_sprite[fake_slope];
    01917
    01918     DrawGroundSprite(image, PAL_NONE, &(_halftile_sub_sprite[halftile_corner]));
    01919
    01920     track = CornerToTrackBits(halftile_corner);
    01921
    01922     int offset;
    01923     switch (track) {
    01924       default: NOT_REACHED();
    01925       case TRACK_BIT_UPPER: offset = RTO_N; break;
    01926       case TRACK_BIT_LOWER: offset = RTO_S; break;
    01927       case TRACK_BIT_RIGHT: offset = RTO_E; break;
    01928       case TRACK_BIT_LEFT:  offset = RTO_W; break;
    01929     }
    01930
    01931     DrawTrackSprite(ground + offset, PAL_NONE, ti, fake_slope);
    01932     if (HasReservedTracks(ti->tile, track)) {
    01933       DrawTrackSprite(overlay + offset, PALETTE_CRASH, ti, fake_slope);
    01934     }
    01935   }
    01936 }
    01937
    01943 static void DrawTrackBits(TileInfo *ti, TrackBits track)
    01944 {
    01945   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    01946
    01947   if (rti->UsesOverlay()) {
    01948     DrawTrackBitsOverlay(ti, track, rti);
    01949     return;
    01950   }
    01951
    01952   RailGroundType rgt = GetRailGroundType(ti->tile);
    01953   Foundation f = GetRailFoundation(ti->tileh, track);
    01954   Corner halftile_corner = CORNER_INVALID;
    01955
    01956   if (IsNonContinuousFoundation(f)) {
    01957     /* Save halftile corner */
    01958     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
    01959     /* Draw lower part first */
    01960     track &= ~CornerToTrackBits(halftile_corner);
    01961     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
    01962   }
    01963
    01964   DrawFoundation(ti, f);
    01965   /* DrawFoundation modifies ti */
    01966
    01967   SpriteID image;
    01968   PaletteID pal = PAL_NONE;
    01969   const SubSprite *sub = NULL;
    01970   bool junction = false;
    01971
    01972   /* Select the sprite to use. */
    01973   if (track == 0) {
    01974     /* Clear ground (only track on halftile foundation) */
    01975     if (rgt == RAIL_GROUND_WATER) {
    01976       if (IsSteepSlope(ti->tileh)) {
    01977         DrawShoreTile(ti->tileh);
    01978         image = 0;
    01979       } else {
    01980         image = SPR_FLAT_WATER_TILE;
    01981       }
    01982     } else {
    01983       switch (rgt) {
    01984         case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01985         case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
    01986         default:                     image = SPR_FLAT_GRASS_TILE; break;
    01987       }
    01988       image += _tileh_to_sprite[ti->tileh];
    01989     }
    01990   } else {
    01991     if (ti->tileh != SLOPE_FLAT) {
    01992       /* track on non-flat ground */
    01993       image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
    01994     } else {
    01995       /* track on flat ground */
    01996       (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
    01997       (image++,                           track == TRACK_BIT_X) ||
    01998       (image++,                           track == TRACK_BIT_UPPER) ||
    01999       (image++,                           track == TRACK_BIT_LOWER) ||
    02000       (image++,                           track == TRACK_BIT_RIGHT) ||
    02001       (image++,                           track == TRACK_BIT_LEFT) ||
    02002       (image++,                           track == TRACK_BIT_CROSS) ||
    02003
    02004       (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
    02005       (image++,                            track == TRACK_BIT_VERT) ||
    02006
    02007       (junction = true, false) ||
    02008       (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
    02009       (image++,                          (track & TRACK_BIT_3WAY_SW) == 0) ||
    02010       (image++,                          (track & TRACK_BIT_3WAY_NW) == 0) ||
    02011       (image++,                          (track & TRACK_BIT_3WAY_SE) == 0) ||
    02012       (image++, true);
    02013     }
    02014
    02015     switch (rgt) {
    02016       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    02017       case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset;  break;
    02018       case RAIL_GROUND_WATER: {
    02019         /* three-corner-raised slope */
    02020         DrawShoreTile(ti->tileh);
    02021         Corner track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    02022         sub = &(_halftile_sub_sprite[track_corner]);
    02023         break;
    02024       }
    02025       default: break;
    02026     }
    02027   }
    02028
    02029   if (image != 0) DrawGroundSprite(image, pal, sub);
    02030
    02031   /* Draw track pieces individually for junction tiles */
    02032   if (junction) {
    02033     if (track & TRACK_BIT_X)     DrawGroundSprite(rti->base_sprites.single_x, PAL_NONE);
    02034     if (track & TRACK_BIT_Y)     DrawGroundSprite(rti->base_sprites.single_y, PAL_NONE);
    02035     if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PAL_NONE);
    02036     if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PAL_NONE);
    02037     if (track & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PAL_NONE);
    02038     if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PAL_NONE);
    02039   }
    02040
    02041   /* PBS debugging, draw reserved tracks darker */
    02042   if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation) {
    02043     /* Get reservation, but mask track on halftile slope */
    02044     TrackBits pbs = GetRailReservationTrackBits(ti->tile) & track;
    02045     if (pbs & TRACK_BIT_X) {
    02046       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
    02047         DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH);
    02048       } else {
    02049         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
    02050       }
    02051     }
    02052     if (pbs & TRACK_BIT_Y) {
    02053       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
    02054         DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH);
    02055       } else {
    02056         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
    02057       }
    02058     }
    02059     if (pbs & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_N ? -TILE_HEIGHT : 0);
    02060     if (pbs & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_S ? -TILE_HEIGHT : 0);
    02061     if (pbs & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_W ? -TILE_HEIGHT : 0);
    02062     if (pbs & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_E ? -TILE_HEIGHT : 0);
    02063   }
    02064
    02065   if (IsValidCorner(halftile_corner)) {
    02066     DrawFoundation(ti, HalftileFoundation(halftile_corner));
    02067
    02068     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
    02069     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    02070     image = _track_sloped_sprites[fake_slope - 1] + rti->base_sprites.track_y;
    02071     pal = PAL_NONE;
    02072     switch (rgt) {
    02073       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    02074       case RAIL_GROUND_ICE_DESERT:
    02075       case RAIL_GROUND_HALF_SNOW:  image += rti->snow_offset;  break; // higher part has snow in this case too
    02076       default: break;
    02077     }
    02078     DrawGroundSprite(image, pal, &(_halftile_sub_sprite[halftile_corner]));
    02079
    02080     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, CornerToTrackBits(halftile_corner))) {
    02081       static const byte _corner_to_track_sprite[] = {3, 1, 2, 0};
    02082       DrawGroundSprite(_corner_to_track_sprite[halftile_corner] + rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, -TILE_HEIGHT);
    02083     }
    02084   }
    02085 }
    02086
    02092 enum {
    02093   SIGNAL_TO_SOUTHWEST =  0,
    02094   SIGNAL_TO_NORTHEAST =  2,
    02095   SIGNAL_TO_SOUTHEAST =  4,
    02096   SIGNAL_TO_NORTHWEST =  6,
    02097   SIGNAL_TO_EAST      =  8,
    02098   SIGNAL_TO_WEST      = 10,
    02099   SIGNAL_TO_SOUTH     = 12,
    02100   SIGNAL_TO_NORTH     = 14,
    02101 };
    02102
    02103 static void DrawSignals(TileIndex tile, TrackBits rails)
    02104 {
    02105 #define MAYBE_DRAW_SIGNAL(x, y, z, t) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, t, GetSingleSignalState(tile, x), y, z)
    02106
    02107   if (!(rails & TRACK_BIT_Y)) {
    02108     if (!(rails & TRACK_BIT_X)) {
    02109       if (rails & TRACK_BIT_LEFT) {
    02110         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTH, 0, TRACK_LEFT);
    02111         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTH, 1, TRACK_LEFT);
    02112       }
    02113       if (rails & TRACK_BIT_RIGHT) {
    02114         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_NORTH, 2, TRACK_RIGHT);
    02115         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_SOUTH, 3, TRACK_RIGHT);
    02116       }
    02117       if (rails & TRACK_BIT_UPPER) {
    02118         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_WEST, 4, TRACK_UPPER);
    02119         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_EAST, 5, TRACK_UPPER);
    02120       }
    02121       if (rails & TRACK_BIT_LOWER) {
    02122         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_WEST, 6, TRACK_LOWER);
    02123         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_EAST, 7, TRACK_LOWER);
    02124       }
    02125     } else {
    02126       MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHWEST, 8, TRACK_X);
    02127       MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHEAST, 9, TRACK_X);
    02128     }
    02129   } else {
    02130     MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHEAST, 10, TRACK_Y);
    02131     MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHWEST, 11, TRACK_Y);
    02132   }
    02133 }
    02134
    02135 static void DrawTile_Track(TileInfo *ti)
    02136 {
    02137   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    02138
    02139   _drawtile_track_palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
    02140
    02141   if (IsPlainRail(ti->tile)) {
    02142     TrackBits rails = GetTrackBits(ti->tile);
    02143
    02144     DrawTrackBits(ti, rails);
    02145
    02146     if (HasBit(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti, rti);
    02147
    02148     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    02149
    02150     if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
    02151   } else {
    02152     /* draw depot */
    02153     const DrawTileSprites *dts;
    02154     PaletteID pal = PAL_NONE;
    02155     SpriteID relocation;
    02156
    02157     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
    02158
    02159     if (IsInvisibilitySet(TO_BUILDINGS)) {
    02160       /* Draw rail instead of depot */
    02161       dts = &_depot_invisible_gfx_table[GetRailDepotDirection(ti->tile)];
    02162     } else {
    02163       dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
    02164     }
    02165
    02166     SpriteID image;
    02167     if (rti->UsesOverlay()) {
    02168       image = SPR_FLAT_GRASS_TILE;
    02169     } else {
    02170       image = dts->ground.sprite;
    02171       if (image != SPR_FLAT_GRASS_TILE) image += rti->total_offset;
    02172     }
    02173
    02174     /* adjust ground tile for desert
    02175      * don't adjust for snow, because snow in depots looks weird */
    02176     if (IsSnowRailGround(ti->tile) && _settings_game.game_creation.landscape == LT_TROPIC) {
    02177       if (image != SPR_FLAT_GRASS_TILE) {
    02178         image += rti->snow_offset; // tile with tracks
    02179       } else {
    02180         image = SPR_FLAT_SNOW_DESERT_TILE; // flat ground
    02181       }
    02182     }
    02183
    02184     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, _drawtile_track_palette));
    02185
    02186     if (rti->UsesOverlay()) {
    02187       SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
    02188
    02189       switch (GetRailDepotDirection(ti->tile)) {
    02190         case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02191         case DIAGDIR_SW: DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
    02192         case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02193         case DIAGDIR_SE: DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
    02194         default: break;
    02195       }
    02196
    02197       if (_settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
    02198         SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
    02199
    02200         switch (GetRailDepotDirection(ti->tile)) {
    02201           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02202           case DIAGDIR_SW: DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH); break;
    02203           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02204           case DIAGDIR_SE: DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH); break;
    02205           default: break;
    02206         }
    02207       }
    02208
    02209       relocation  = GetCustomRailSprite(rti, ti->tile, RTSG_DEPOT);
    02210       relocation -= SPR_RAIL_DEPOT_SE_1;
    02211     } else {
    02212       /* PBS debugging, draw reserved tracks darker */
    02213       if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
    02214         switch (GetRailDepotDirection(ti->tile)) {
    02215           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02216           case DIAGDIR_SW: DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH); break;
    02217           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02218           case DIAGDIR_SE: DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH); break;
    02219           default: break;
    02220         }
    02221       }
    02222
    02223       relocation = rti->total_offset;
    02224     }
    02225
    02226     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    02227
    02228     DrawRailTileSeq(ti, dts, TO_BUILDINGS, relocation, 0, _drawtile_track_palette);
    02229   }
    02230   DrawBridgeMiddle(ti);
    02231 }
    02232
    02233 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
    02234 {
    02235   const DrawTileSprites *dts = &_depot_gfx_table[dir];
    02236   const RailtypeInfo *rti = GetRailTypeInfo(railtype);
    02237   SpriteID image = rti->UsesOverlay() ? SPR_FLAT_GRASS_TILE : dts->ground.sprite;
    02238   uint32 offset = rti->total_offset;
    02239
    02240   x += 33;
    02241   y += 17;
    02242
    02243   if (image != SPR_FLAT_GRASS_TILE) image += offset;
    02244   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
    02245
    02246   DrawSprite(image, PAL_NONE, x, y);
    02247
    02248   if (rti->UsesOverlay()) {
    02249     SpriteID ground = GetCustomRailSprite(rti, INVALID_TILE, RTSG_GROUND);
    02250
    02251     switch (dir) {
    02252       case DIAGDIR_SW: DrawSprite(ground + RTO_X, PAL_NONE, x, y); break;
    02253       case DIAGDIR_SE: DrawSprite(ground + RTO_Y, PAL_NONE, x, y); break;
    02254       default: break;
    02255     }
    02256
    02257     offset  = GetCustomRailSprite(rti, INVALID_TILE, RTSG_DEPOT);
    02258     offset -= SPR_RAIL_DEPOT_SE_1;
    02259   }
    02260
    02261   DrawRailTileSeqInGUI(x, y, dts, offset, 0, palette);
    02262 }
    02263
    02264 static uint GetSlopeZ_Track(TileIndex tile, uint x, uint y)
    02265 {
    02266   uint z;
    02267   Slope tileh = GetTileSlope(tile, &z);
    02268
    02269   if (tileh == SLOPE_FLAT) return z;
    02270   if (IsPlainRail(tile)) {
    02271     z += ApplyFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
    02272     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
    02273   } else {
    02274     return z + TILE_HEIGHT;
    02275   }
    02276 }
    02277
    02278 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
    02279 {
    02280   return IsPlainRail(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
    02281 }
    02282
    02283 static void TileLoop_Track(TileIndex tile)
    02284 {
    02285   RailGroundType old_ground = GetRailGroundType(tile);
    02286   RailGroundType new_ground;
    02287
    02288   if (old_ground == RAIL_GROUND_WATER) {
    02289     TileLoop_Water(tile);
    02290     return;
    02291   }
    02292
    02293   switch (_settings_game.game_creation.landscape) {
    02294     case LT_ARCTIC: {
    02295       uint z;
    02296       Slope slope = GetTileSlope(tile, &z);
    02297       bool half = false;
    02298
    02299       /* for non-flat track, use lower part of track
    02300        * in other cases, use the highest part with track */
    02301       if (IsPlainRail(tile)) {
    02302         TrackBits track = GetTrackBits(tile);
    02303         Foundation f = GetRailFoundation(slope, track);
    02304
    02305         switch (f) {
    02306           case FOUNDATION_NONE:
    02307             /* no foundation - is the track on the upper side of three corners raised tile? */
    02308             if (IsSlopeWithThreeCornersRaised(slope)) z += TILE_HEIGHT;
    02309             break;
    02310
    02311           case FOUNDATION_INCLINED_X:
    02312           case FOUNDATION_INCLINED_Y:
    02313             /* sloped track - is it on a steep slope? */
    02314             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    02315             break;
    02316
    02317           case FOUNDATION_STEEP_LOWER:
    02318             /* only lower part of steep slope */
    02319             z += TILE_HEIGHT;
    02320             break;
    02321
    02322           default:
    02323             /* if it is a steep slope, then there is a track on higher part */
    02324             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    02325             z += TILE_HEIGHT;
    02326             break;
    02327         }
    02328
    02329         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
    02330       } else {
    02331         /* is the depot on a non-flat tile? */
    02332         if (slope != SLOPE_FLAT) z += TILE_HEIGHT;
    02333       }
    02334
    02335       /* 'z' is now the lowest part of the highest track bit -
    02336        * for sloped track, it is 'z' of lower part
    02337        * for two track bits, it is 'z' of higher track bit
    02338        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
    02339       if (z > GetSnowLine()) {
    02340         if (half && z - GetSnowLine() == TILE_HEIGHT) {
    02341           /* track on non-continuous foundation, lower part is not under snow */
    02342           new_ground = RAIL_GROUND_HALF_SNOW;
    02343         } else {
    02344           new_ground = RAIL_GROUND_ICE_DESERT;
    02345         }
    02346         goto set_ground;
    02347       }
    02348       break;
    02349       }
    02350
    02351     case LT_TROPIC:
    02352       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
    02353         new_ground = RAIL_GROUND_ICE_DESERT;
    02354         goto set_ground;
    02355       }
    02356       break;
    02357   }
    02358
    02359   if (!IsPlainRail(tile)) return;
    02360
    02361   new_ground = RAIL_GROUND_GRASS;
    02362
    02363   if (old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
    02364     /* determine direction of fence */
    02365     TrackBits rail = GetTrackBits(tile);
    02366
    02367     switch (rail) {
    02368       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
    02369       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
    02370       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
    02371       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
    02372
    02373       default: {
    02374         Owner owner = GetTileOwner(tile);
    02375
    02376         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
    02377               (rail & TRACK_BIT_3WAY_NW) == 0 &&
    02378               (rail & TRACK_BIT_X)
    02379             )) {
    02380           TileIndex n = tile + TileDiffXY(0, -1);
    02381           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02382
    02383           if (!IsTileType(n, MP_RAILWAY) ||
    02384               !IsTileOwner(n, owner) ||
    02385               nrail == TRACK_BIT_UPPER ||
    02386               nrail == TRACK_BIT_LEFT) {
    02387             new_ground = RAIL_GROUND_FENCE_NW;
    02388           }
    02389         }
    02390
    02391         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
    02392               (rail & TRACK_BIT_3WAY_SE) == 0 &&
    02393               (rail & TRACK_BIT_X)
    02394             )) {
    02395           TileIndex n = tile + TileDiffXY(0, 1);
    02396           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02397
    02398           if (!IsTileType(n, MP_RAILWAY) ||
    02399               !IsTileOwner(n, owner) ||
    02400               nrail == TRACK_BIT_LOWER ||
    02401               nrail == TRACK_BIT_RIGHT) {
    02402             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
    02403               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
    02404           }
    02405         }
    02406
    02407         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
    02408               (rail & TRACK_BIT_3WAY_NE) == 0 &&
    02409               (rail & TRACK_BIT_Y)
    02410             )) {
    02411           TileIndex n = tile + TileDiffXY(-1, 0);
    02412           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02413
    02414           if (!IsTileType(n, MP_RAILWAY) ||
    02415               !IsTileOwner(n, owner) ||
    02416               nrail == TRACK_BIT_UPPER ||
    02417               nrail == TRACK_BIT_RIGHT) {
    02418             new_ground = RAIL_GROUND_FENCE_NE;
    02419           }
    02420         }
    02421
    02422         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
    02423               (rail & TRACK_BIT_3WAY_SW) == 0 &&
    02424               (rail & TRACK_BIT_Y)
    02425             )) {
    02426           TileIndex n = tile + TileDiffXY(1, 0);
    02427           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02428
    02429           if (!IsTileType(n, MP_RAILWAY) ||
    02430               !IsTileOwner(n, owner) ||
    02431               nrail == TRACK_BIT_LOWER ||
    02432               nrail == TRACK_BIT_LEFT) {
    02433             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
    02434               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
    02435           }
    02436         }
    02437         break;
    02438       }
    02439     }
    02440   }
    02441
    02442 set_ground:
    02443   if (old_ground != new_ground) {
    02444     SetRailGroundType(tile, new_ground);
    02445     MarkTileDirtyByTile(tile);
    02446   }
    02447 }
    02448
    02449
    02450 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
    02451 {
    02452   /* Case of half tile slope with water. */
    02453   if (mode == TRANSPORT_WATER && IsPlainRail(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
    02454     TrackBits tb = GetTrackBits(tile);
    02455     switch (tb) {
    02456       default: NOT_REACHED();
    02457       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
    02458       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
    02459       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
    02460       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
    02461     }
    02462     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
    02463   }
    02464
    02465   if (mode != TRANSPORT_RAIL) return 0;
    02466
    02467   TrackBits trackbits = TRACK_BIT_NONE;
    02468   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
    02469
    02470   switch (GetRailTileType(tile)) {
    02471     default: NOT_REACHED();
    02472     case RAIL_TILE_NORMAL:
    02473       trackbits = GetTrackBits(tile);
    02474       break;
    02475
    02476     case RAIL_TILE_SIGNALS: {
    02477       trackbits = GetTrackBits(tile);
    02478       byte a = GetPresentSignals(tile);
    02479       uint b = GetSignalStates(tile);
    02480
    02481       b &= a;
    02482
    02483       /* When signals are not present (in neither direction),
    02484        * we pretend them to be green. Otherwise, it depends on
    02485        * the signal type. For signals that are only active from
    02486        * one side, we set the missing signals explicitely to
    02487        * `green'. Otherwise, they implicitely become `red'. */
    02488       if (!IsOnewaySignal(tile, TRACK_UPPER) || (a & SignalOnTrack(TRACK_UPPER)) == 0) b |= ~a & SignalOnTrack(TRACK_UPPER);
    02489       if (!IsOnewaySignal(tile, TRACK_LOWER) || (a & SignalOnTrack(TRACK_LOWER)) == 0) b |= ~a & SignalOnTrack(TRACK_LOWER);
    02490
    02491       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
    02492       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
    02493       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
    02494       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
    02495
    02496       break;
    02497     }
    02498
    02499     case RAIL_TILE_DEPOT: {
    02500       DiagDirection dir = GetRailDepotDirection(tile);
    02501
    02502       if (side != INVALID_DIAGDIR && side != dir) break;
    02503
    02504       trackbits = DiagDirToDiagTrackBits(dir);
    02505       break;
    02506     }
    02507   }
    02508
    02509   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
    02510 }
    02511
    02512 static bool ClickTile_Track(TileIndex tile)
    02513 {
    02514   if (!IsRailDepot(tile)) return false;
    02515
    02516   ShowDepotWindow(tile, VEH_TRAIN);
    02517   return true;
    02518 }
    02519
    02520 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
    02521 {
    02522   td->owner[0] = GetTileOwner(tile);
    02523   switch (GetRailTileType(tile)) {
    02524     case RAIL_TILE_NORMAL:
    02525       td->str = STR_LAI_RAIL_DESCRIPTION_TRACK;
    02526       break;
    02527
    02528     case RAIL_TILE_SIGNALS: {
    02529       static const StringID signal_type[6][6] = {
    02530         {
    02531           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_SIGNALS,
    02532           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
    02533           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
    02534           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02535           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
    02536           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS
    02537         },
    02538         {
    02539           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
    02540           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRESIGNALS,
    02541           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
    02542           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
    02543           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
    02544           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS
    02545         },
    02546         {
    02547           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
    02548           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
    02549           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXITSIGNALS,
    02550           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
    02551           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
    02552           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS
    02553         },
    02554         {
    02555           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02556           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
    02557           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
    02558           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBOSIGNALS,
    02559           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
    02560           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS
    02561         },
    02562         {
    02563           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
    02564           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
    02565           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
    02566           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
    02567           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBSSIGNALS,
    02568           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS
    02569         },
    02570         {
    02571           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS,
    02572           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS,
    02573           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS,
    02574           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS,
    02575           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS,
    02576           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NOENTRYSIGNALS
    02577         }
    02578       };
    02579
    02580       SignalType primary_signal;
    02581       SignalType secondary_signal;
    02582       if (HasSignalOnTrack(tile, TRACK_UPPER)) {
    02583         primary_signal = GetSignalType(tile, TRACK_UPPER);
    02584         secondary_signal = HasSignalOnTrack(tile, TRACK_LOWER) ? GetSignalType(tile, TRACK_LOWER) : primary_signal;
    02585       } else {
    02586         secondary_signal = primary_signal = GetSignalType(tile, TRACK_LOWER);
    02587       }
    02588
    02589       td->str = signal_type[secondary_signal][primary_signal];
    02590       break;
    02591     }
    02592
    02593     case RAIL_TILE_DEPOT:
    02594       td->str = STR_LAI_RAIL_DESCRIPTION_TRAIN_DEPOT;
    02595       break;
    02596
    02597     default:
    02598       NOT_REACHED();
    02599   }
    02600 }
    02601
    02602 static void ChangeTileOwner_Track(TileIndex tile, Owner old_owner, Owner new_owner)
    02603 {
    02604   if (!IsTileOwner(tile, old_owner)) return;
    02605
    02606   if (new_owner != INVALID_OWNER) {
    02607     SetTileOwner(tile, new_owner);
    02608   } else {
    02609     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
    02610   }
    02611 }
    02612
    02613 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
    02614 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
    02615 static const int8 _deltacoord_leaveoffset[8] = {
    02616   -1,  0,  1,  0, /* x */
    02617    0,  1,  0, -1  /* y */
    02618 };
    02619
    02620
    02626 int TicksToLeaveDepot(const Train *v)
    02627 {
    02628   DiagDirection dir = GetRailDepotDirection(v->tile);
    02629   int length = v->tcache.cached_veh_length;
    02630
    02631   switch (dir) {
    02632     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
    02633     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
    02634     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
    02635     default:
    02636     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
    02637   }
    02638
    02639   return 0; // make compilers happy
    02640 }
    02641
    02644 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *u, TileIndex tile, int x, int y)
    02645 {
    02646   /* this routine applies only to trains in depot tiles */
    02647   if (u->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
    02648
    02649   Train *v = Train::From(u);
    02650
    02651   /* depot direction */
    02652   DiagDirection dir = GetRailDepotDirection(tile);
    02653
    02654   /* calculate the point where the following wagon should be activated
    02655    * this depends on the length of the current vehicle */
    02656   int length = v->tcache.cached_veh_length;
    02657
    02658   byte fract_coord_leave =
    02659     ((_fractcoords_enter[dir] & 0x0F) + // x
    02660       (length + 1) * _deltacoord_leaveoffset[dir]) +
    02661     (((_fractcoords_enter[dir] >> 4) +  // y
    02662       ((length + 1) * _deltacoord_leaveoffset[dir + 4])) << 4);
    02663
    02664   byte fract_coord = (x & 0xF) + ((y & 0xF) << 4);
    02665
    02666   if (_fractcoords_behind[dir] == fract_coord) {
    02667     /* make sure a train is not entering the tile from behind */
    02668     return VETSB_CANNOT_ENTER;
    02669   } else if (_fractcoords_enter[dir] == fract_coord) {
    02670     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
    02671       /* enter the depot */
    02672       v->track = TRACK_BIT_DEPOT,
    02673       v->vehstatus |= VS_HIDDEN; // hide it
    02674       v->direction = ReverseDir(v->direction);
    02675       if (v->Next() == NULL) VehicleEnterDepot(v->First());
    02676       v->tile = tile;
    02677
    02678       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
    02679       return VETSB_ENTERED_WORMHOLE;
    02680     }
    02681   } else if (fract_coord_leave == fract_coord) {
    02682     if (DiagDirToDir(dir) == v->direction) {
    02683       /* leave the depot? */
    02684       if ((v = v->Next()) != NULL) {
    02685         v->vehstatus &= ~VS_HIDDEN;
    02686         v->track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
    02687       }
    02688     }
    02689   }
    02690
    02691   return VETSB_CONTINUE;
    02692 }
    02693
    02705 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, uint z_old, Slope tileh_old, uint z_new, Slope tileh_new, TrackBits rail_bits)
    02706 {
    02707   if (!_settings_game.construction.build_on_slopes || !AutoslopeEnabled()) return CMD_ERROR;
    02708
    02709   /* Is the slope-rail_bits combination valid in general? I.e. is it safe to call GetRailFoundation() ? */
    02710   if (CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile).Failed()) return CMD_ERROR;
    02711
    02712   /* Get the slopes on top of the foundations */
    02713   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
    02714   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
    02715
    02716   Corner track_corner;
    02717   switch (rail_bits) {
    02718     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
    02719     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
    02720     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
    02721     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
    02722
    02723     /* Surface slope must not be changed */
    02724     default: return (((z_old != z_new) || (tileh_old != tileh_new)) ? CMD_ERROR : CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]));
    02725   }
    02726
    02727   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
    02728   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
    02729   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
    02730   if (z_old != z_new) return CMD_ERROR;
    02731
    02732   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    02733   /* Make the ground dirty, if surface slope has changed */
    02734   if (tileh_old != tileh_new) {
    02735     /* If there is flat water on the lower halftile add the cost for clearing it */
    02736     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price[PR_CLEAR_WATER]);
    02737     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02738   }
    02739   return  cost;
    02740 }
    02741
    02742 static CommandCost TerraformTile_Track(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
    02743 {
    02744   uint z_old;
    02745   Slope tileh_old = GetTileSlope(tile, &z_old);
    02746   if (IsPlainRail(tile)) {
    02747     TrackBits rail_bits = GetTrackBits(tile);
    02748     /* Is there flat water on the lower halftile, that must be cleared expensively? */
    02749     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
    02750
    02751     _error_message = STR_ERROR_MUST_REMOVE_RAILROAD_TRACK;
    02752
    02753     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
    02754     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
    02755
    02756     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
    02757     Corner allowed_corner;
    02758     switch (rail_bits) {
    02759       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
    02760       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
    02761       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
    02762       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
    02763       default: return autoslope_result;
    02764     }
    02765
    02766     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
    02767
    02768     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
    02769     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
    02770
    02771     /* Everything is valid, which only changes allowed_corner */
    02772     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
    02773       if (allowed_corner == corner) continue;
    02774       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
    02775     }
    02776
    02777     /* Make the ground dirty */
    02778     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02779
    02780     /* allow terraforming */
    02781     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price[PR_CLEAR_WATER] : (Money)0);
    02782   } else if (_settings_game.construction.build_on_slopes && AutoslopeEnabled() &&
    02783       AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) {
    02784     return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    02785   }
    02786   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    02787 }
    02788
    02789
    02790 extern const TileTypeProcs _tile_type_rail_procs = {
    02791   DrawTile_Track,           // draw_tile_proc
    02792   GetSlopeZ_Track,          // get_slope_z_proc
    02793   ClearTile_Track,          // clear_tile_proc
    02794   NULL,                     // add_accepted_cargo_proc
    02795   GetTileDesc_Track,        // get_tile_desc_proc
    02796   GetTileTrackStatus_Track, // get_tile_track_status_proc
    02797   ClickTile_Track,          // click_tile_proc
    02798   NULL,                     // animate_tile_proc
    02799   TileLoop_Track,           // tile_loop_clear
    02800   ChangeTileOwner_Track,    // change_tile_owner_clear
    02801   NULL,                     // add_produced_cargo_proc
    02802   VehicleEnter_Track,       // vehicle_enter_tile_proc
    02803   GetFoundation_Track,      // get_foundation_proc
    02804   TerraformTile_Track,      // terraform_tile_proc
    02805 };