# rail_cmd.cpp

Go to the documentation of this file.

    00001 /* $Id: rail_cmd.cpp 19439 2010-03-16 20:54:26Z 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);
    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       cost.AddCost(RailClearCost(GetRailType(tile)));
    00537
    00538       if (flags & DC_EXEC) {
    00539         if (HasReservedTracks(tile, trackbit)) {
    00540           v = GetTrainForReservation(tile, track);
    00541           if (v != NULL) FreeTrainTrackReservation(v);
    00542         }
    00543         owner = GetTileOwner(tile);
    00544         MakeRoadNormal(tile, GetCrossingRoadBits(tile), GetRoadTypes(tile), GetTownIndex(tile), GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM));
    00545       }
    00546       break;
    00547     }
    00548
    00549     case MP_RAILWAY: {
    00550       TrackBits present;
    00551
    00552       if (!IsPlainRail(tile) ||
    00553           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
    00554           !EnsureNoTrainOnTrack(tile, track)) {
    00555         return CMD_ERROR;
    00556       }
    00557
    00558       present = GetTrackBits(tile);
    00559       if ((present & trackbit) == 0) return CMD_ERROR;
    00560       if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
    00561
    00562       cost.AddCost(RailClearCost(GetRailType(tile)));
    00563
    00564       /* Charge extra to remove signals on the track, if they are there */
    00565       if (HasSignalOnTrack(tile, track))
    00566         cost.AddCost(DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS));
    00567
    00568       if (flags & DC_EXEC) {
    00569         if (HasReservedTracks(tile, trackbit)) {
    00570           v = GetTrainForReservation(tile, track);
    00571           if (v != NULL) FreeTrainTrackReservation(v);
    00572         }
    00573         owner = GetTileOwner(tile);
    00574         present ^= trackbit;
    00575         if (present == 0) {
    00576           Slope tileh = GetTileSlope(tile, NULL);
    00577           /* If there is flat water on the lower halftile, convert the tile to shore so the water remains */
    00578           if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh)) {
    00579             MakeShore(tile);
    00580           } else {
    00581             DoClearSquare(tile);
    00582           }
    00583         } else {
    00584           SetTrackBits(tile, present);
    00585           SetTrackReservation(tile, GetRailReservationTrackBits(tile) & present);
    00586         }
    00587       }
    00588       break;
    00589     }
    00590
    00591     default: return CMD_ERROR;
    00592   }
    00593
    00594   if (flags & DC_EXEC) {
    00595     /* if we got that far, 'owner' variable is set correctly */
    00596     assert(Company::IsValidID(owner));
    00597
    00598     MarkTileDirtyByTile(tile);
    00599     if (crossing) {
    00600       /* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we
    00601        * are removing one of these pieces, we'll need to update signals for
    00602        * both directions explicitly, as after the track is removed it won't
    00603        * 'connect' with the other piece. */
    00604       AddTrackToSignalBuffer(tile, TRACK_X, owner);
    00605       AddTrackToSignalBuffer(tile, TRACK_Y, owner);
    00606       YapfNotifyTrackLayoutChange(tile, TRACK_X);
    00607       YapfNotifyTrackLayoutChange(tile, TRACK_Y);
    00608     } else {
    00609       AddTrackToSignalBuffer(tile, track, owner);
    00610       YapfNotifyTrackLayoutChange(tile, track);
    00611     }
    00612
    00613     if (v != NULL) TryPathReserve(v, true);
    00614   }
    00615
    00616   return cost;
    00617 }
    00618
    00619
    00627 bool FloodHalftile(TileIndex t)
    00628 {
    00629   assert(IsPlainRailTile(t));
    00630
    00631   bool flooded = false;
    00632   if (GetRailGroundType(t) == RAIL_GROUND_WATER) return flooded;
    00633
    00634   Slope tileh = GetTileSlope(t, NULL);
    00635   TrackBits rail_bits = GetTrackBits(t);
    00636
    00637   if (IsSlopeWithOneCornerRaised(tileh)) {
    00638     TrackBits lower_track = CornerToTrackBits(OppositeCorner(GetHighestSlopeCorner(tileh)));
    00639
    00640     TrackBits to_remove = lower_track & rail_bits;
    00641     if (to_remove != 0) {
    00642       _current_company = OWNER_WATER;
    00643       if (DoCommand(t, 0, FIND_FIRST_BIT(to_remove), DC_EXEC, CMD_REMOVE_SINGLE_RAIL).Failed()) return flooded; // not yet floodable
    00644       flooded = true;
    00645       rail_bits = rail_bits & ~to_remove;
    00646       if (rail_bits == 0) {
    00647         MakeShore(t);
    00648         MarkTileDirtyByTile(t);
    00649         return flooded;
    00650       }
    00651     }
    00652
    00653     if (IsNonContinuousFoundation(GetRailFoundation(tileh, rail_bits))) {
    00654       flooded = true;
    00655       SetRailGroundType(t, RAIL_GROUND_WATER);
    00656       MarkTileDirtyByTile(t);
    00657     }
    00658   } else {
    00659     /* Make shore on steep slopes and 'three-corners-raised'-slopes. */
    00660     if (ApplyFoundationToSlope(GetRailFoundation(tileh, rail_bits), &tileh) == 0) {
    00661       if (IsSteepSlope(tileh) || IsSlopeWithThreeCornersRaised(tileh)) {
    00662         flooded = true;
    00663         SetRailGroundType(t, RAIL_GROUND_WATER);
    00664         MarkTileDirtyByTile(t);
    00665       }
    00666     }
    00667   }
    00668   return flooded;
    00669 }
    00670
    00671 static const TileIndexDiffC _trackdelta[] = {
    00672   { -1,  0 }, {  0,  1 }, { -1,  0 }, {  0,  1 }, {  1,  0 }, {  0,  1 },
    00673   {  0,  0 },
    00674   {  0,  0 },
    00675   {  1,  0 }, {  0, -1 }, {  0, -1 }, {  1,  0 }, {  0, -1 }, { -1,  0 },
    00676   {  0,  0 },
    00677   {  0,  0 }
    00678 };
    00679
    00680
    00681 static CommandCost ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)
    00682 {
    00683   int x = TileX(start);
    00684   int y = TileY(start);
    00685   int ex = TileX(end);
    00686   int ey = TileY(end);
    00687
    00688   if (!ValParamTrackOrientation(TrackdirToTrack(*trackdir))) return CMD_ERROR;
    00689
    00690   /* calculate delta x,y from start to end tile */
    00691   int dx = ex - x;
    00692   int dy = ey - y;
    00693
    00694   /* calculate delta x,y for the first direction */
    00695   int trdx = _trackdelta[*trackdir].x;
    00696   int trdy = _trackdelta[*trackdir].y;
    00697
    00698   if (!IsDiagonalTrackdir(*trackdir)) {
    00699     trdx += _trackdelta[*trackdir ^ 1].x;
    00700     trdy += _trackdelta[*trackdir ^ 1].y;
    00701   }
    00702
    00703   /* validate the direction */
    00704   while (
    00705     (trdx <= 0 && dx > 0) ||
    00706     (trdx >= 0 && dx < 0) ||
    00707     (trdy <= 0 && dy > 0) ||
    00708     (trdy >= 0 && dy < 0)
    00709   ) {
    00710     if (!HasBit(*trackdir, 3)) { // first direction is invalid, try the other
    00711       SetBit(*trackdir, 3); // reverse the direction
    00712       trdx = -trdx;
    00713       trdy = -trdy;
    00714     } else { // other direction is invalid too, invalid drag
    00715       return CMD_ERROR;
    00716     }
    00717   }
    00718
    00719   /* (for diagonal tracks, this is already made sure of by above test), but:
    00720    * for non-diagonal tracks, check if the start and end tile are on 1 line */
    00721   if (!IsDiagonalTrackdir(*trackdir)) {
    00722     trdx = _trackdelta[*trackdir].x;
    00723     trdy = _trackdelta[*trackdir].y;
    00724     if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx))
    00725       return CMD_ERROR;
    00726   }
    00727
    00728   return CommandCost();
    00729 }
    00730
    00743 static CommandCost CmdRailTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00744 {
    00745   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
    00746   Track track = (Track)GB(p2, 4, 3);
    00747   bool remove = HasBit(p2, 7);
    00748   RailType railtype = (RailType)GB(p2, 0, 4);
    00749
    00750   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
    00751   if (p1 >= MapSize()) return CMD_ERROR;
    00752   TileIndex end_tile = p1;
    00753   Trackdir trackdir = TrackToTrackdir(track);
    00754
    00755   if (ValidateAutoDrag(&trackdir, tile, end_tile).Failed()) return CMD_ERROR;
    00756
    00757   if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, tile);
    00758
    00759   for (;;) {
    00760     ret = DoCommand(tile, railtype, TrackdirToTrack(trackdir), flags, remove ? CMD_REMOVE_SINGLE_RAIL : CMD_BUILD_SINGLE_RAIL);
    00761
    00762     if (ret.Failed()) {
    00763       if (_error_message != STR_ERROR_ALREADY_BUILT && !remove) {
    00764         if (HasBit(p2, 8)) return CMD_ERROR;
    00765         break;
    00766       }
    00767       _error_message = INVALID_STRING_ID;
    00768     } else {
    00769       total_cost.AddCost(ret);
    00770     }
    00771
    00772     if (tile == end_tile) break;
    00773
    00774     tile += ToTileIndexDiff(_trackdelta[trackdir]);
    00775
    00776     /* toggle railbit for the non-diagonal tracks */
    00777     if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
    00778   }
    00779
    00780   return (total_cost.GetCost() == 0) ? CommandCost(remove ? INVALID_STRING_ID : (_error_message == INVALID_STRING_ID ? STR_ERROR_ALREADY_BUILT : _error_message)) : total_cost;
    00781 }
    00782
    00796 CommandCost CmdBuildRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00797 {
    00798   return CmdRailTrackHelper(tile, flags, p1, ClrBit(p2, 7), text);
    00799 }
    00800
    00814 CommandCost CmdRemoveRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00815 {
    00816   return CmdRailTrackHelper(tile, flags, p1, SetBit(p2, 7), text);
    00817 }
    00818
    00830 CommandCost CmdBuildTrainDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00831 {
    00832   /* check railtype and valid direction for depot (0 through 3), 4 in total */
    00833   if (!ValParamRailtype((RailType)p1)) return CMD_ERROR;
    00834
    00835   Slope tileh = GetTileSlope(tile, NULL);
    00836
    00837   DiagDirection dir = Extract<DiagDirection, 0>(p2);
    00838
    00839   /* Prohibit construction if
    00840    * The tile is non-flat AND
    00841    * 1) build-on-slopes is disabled
    00842    * 2) the tile is steep i.e. spans two height levels
    00843    * 3) the exit points in the wrong direction
    00844    */
    00845
    00846   if (tileh != SLOPE_FLAT && (
    00847         !_settings_game.construction.build_on_slopes ||
    00848         IsSteepSlope(tileh) ||
    00849         !CanBuildDepotByTileh(dir, tileh)
    00850       )) {
    00851     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
    00852   }
    00853
    00854   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00855   if (cost.Failed()) return CMD_ERROR;
    00856
    00857   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
    00858
    00859   if (!Depot::CanAllocateItem()) return CMD_ERROR;
    00860
    00861   if (flags & DC_EXEC) {
    00862     Depot *d = new Depot(tile);
    00863     d->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
    00864
    00865     MakeRailDepot(tile, _current_company, d->index, dir, (RailType)p1);
    00866     MarkTileDirtyByTile(tile);
    00867
    00868     AddSideToSignalBuffer(tile, INVALID_DIAGDIR, _current_company);
    00869     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
    00870   }
    00871
    00872   cost.AddCost(_price[PR_BUILD_DEPOT_TRAIN]);
    00873   return cost;
    00874 }
    00875
    00896 CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00897 {
    00898   Track track = (Track)GB(p1, 0, 3);
    00899   bool ctrl_pressed = HasBit(p1, 3); // was the CTRL button pressed
    00900   SignalVariant sigvar = (ctrl_pressed ^ HasBit(p1, 4)) ? SIG_SEMAPHORE : SIG_ELECTRIC; // the signal variant of the new signal
    00901   SignalType sigtype = (SignalType)GB(p1, 5, 3); // the signal type of the new signal
    00902   bool convert_signal = HasBit(p1, 8); // convert button pressed
    00903   SignalType cycle_start = (SignalType)GB(p1, 9, 3);
    00904   SignalType cycle_stop = (SignalType)GB(p1, 12, 3);
    00905   uint num_dir_cycle = GB(p1, 15, 2);
    00906
    00907   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
    00908
    00909   /* You can only build signals on plain rail tiles, and the selected track must exist */
    00910   if (!ValParamTrackOrientation(track) || !IsPlainRailTile(tile) ||
    00911       !HasTrack(tile, track) || !EnsureNoTrainOnTrack(tile, track)) {
    00912     return CMD_ERROR;
    00913   }
    00914
    00915   /* Protect against invalid signal copying */
    00916   if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
    00917
    00918   if (!CheckTileOwnership(tile)) return CMD_ERROR;
    00919
    00920   {
    00921     /* See if this is a valid track combination for signals, (ie, no overlap) */
    00922     TrackBits trackbits = GetTrackBits(tile);
    00923     if (KillFirstBit(trackbits) != TRACK_BIT_NONE && // More than one track present
    00924         trackbits != TRACK_BIT_HORZ &&
    00925         trackbits != TRACK_BIT_VERT) {
    00926       return_cmd_error(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK);
    00927     }
    00928   }
    00929
    00930   /* In case we don't want to change an existing signal, return without error. */
    00931   if (HasBit(p1, 17) && HasSignalOnTrack(tile, track)) return CommandCost();
    00932
    00933   /* you can not convert a signal if no signal is on track */
    00934   if (convert_signal && !HasSignalOnTrack(tile, track)) return CMD_ERROR;
    00935
    00936   CommandCost cost;
    00937   if (!HasSignalOnTrack(tile, track)) {
    00938     /* build new signals */
    00939     cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS]);
    00940   } else {
    00941     if (p2 != 0 && sigvar != GetSignalVariant(tile, track)) {
    00942       /* convert signals <-> semaphores */
    00943       cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
    00944
    00945     } else if (convert_signal) {
    00946       /* convert button pressed */
    00947       if (ctrl_pressed || GetSignalVariant(tile, track) != sigvar) {
    00948         /* convert electric <-> semaphore */
    00949         cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
    00950       } else {
    00951         /* it is free to change signal type: normal-pre-exit-combo */
    00952         cost = CommandCost();
    00953       }
    00954
    00955     } else {
    00956       /* it is free to change orientation/pre-exit-combo signals */
    00957       cost = CommandCost();
    00958     }
    00959   }
    00960
    00961   if (flags & DC_EXEC) {
    00962     Train *v = NULL;
    00963     /* The new/changed signal could block our path. As this can lead to
    00964      * stale reservations, we clear the path reservation here and try
    00965      * to redo it later on. */
    00966     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
    00967       v = GetTrainForReservation(tile, track);
    00968       if (v != NULL) FreeTrainTrackReservation(v);
    00969     }
    00970
    00971     if (!HasSignals(tile)) {
    00972       /* there are no signals at all on this tile yet */
    00973       SetHasSignals(tile, true);
    00974       SetSignalStates(tile, 0xF); // all signals are on
    00975       SetPresentSignals(tile, 0); // no signals built by default
    00976       SetSignalType(tile, track, sigtype);
    00977       SetSignalVariant(tile, track, sigvar);
    00978     }
    00979
    00980     if (p2 == 0) {
    00981       if (!HasSignalOnTrack(tile, track)) {
    00982         /* build new signals */
    00983         SetPresentSignals(tile, GetPresentSignals(tile) | (IsPbsSignal(sigtype) ? KillFirstBit(SignalOnTrack(track)) : SignalOnTrack(track)));
    00984         SetSignalType(tile, track, sigtype);
    00985         SetSignalVariant(tile, track, sigvar);
    00986         while (num_dir_cycle-- > 0) CycleSignalSide(tile, track);
    00987       } else {
    00988         if (convert_signal) {
    00989           /* convert signal button pressed */
    00990           if (ctrl_pressed) {
    00991             /* toggle the pressent signal variant: SIG_ELECTRIC <-> SIG_SEMAPHORE */
    00992             SetSignalVariant(tile, track, (GetSignalVariant(tile, track) == SIG_ELECTRIC) ? SIG_SEMAPHORE : SIG_ELECTRIC);
    00993             /* Query current signal type so the check for PBS signals below works. */
    00994             sigtype = GetSignalType(tile, track);
    00995           } else {
    00996             /* convert the present signal to the chosen type and variant */
    00997             SetSignalType(tile, track, sigtype);
    00998             SetSignalVariant(tile, track, sigvar);
    00999             if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
    01000               SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
    01001             }
    01002           }
    01003
    01004         } else if (ctrl_pressed) {
    01005           /* cycle between cycle_start and cycle_end */
    01006           sigtype = (SignalType)(GetSignalType(tile, track) + 1);
    01007
    01008           if (sigtype < cycle_start || sigtype > cycle_stop) sigtype = cycle_start;
    01009
    01010           SetSignalType(tile, track, sigtype);
    01011           if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
    01012             SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
    01013           }
    01014         } else {
    01015           /* cycle the signal side: both -> left -> right -> both -> ... */
    01016           CycleSignalSide(tile, track);
    01017           /* Query current signal type so the check for PBS signals below works. */
    01018           sigtype = GetSignalType(tile, track);
    01019         }
    01020       }
    01021     } else {
    01022       /* If CmdBuildManySignals is called with copying signals, just copy the
    01023        * direction of the first signal given as parameter by CmdBuildManySignals */
    01024       SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | (p2 & SignalOnTrack(track)));
    01025       SetSignalVariant(tile, track, sigvar);
    01026       SetSignalType(tile, track, sigtype);
    01027     }
    01028
    01029     if (IsPbsSignal(sigtype)) {
    01030       /* PBS signals should show red unless they are on a reservation. */
    01031       uint mask = GetPresentSignals(tile) & SignalOnTrack(track);
    01032       SetSignalStates(tile, (GetSignalStates(tile) & ~mask) | ((HasBit(GetRailReservationTrackBits(tile), track) ? UINT_MAX : 0) & mask));
    01033     }
    01034     MarkTileDirtyByTile(tile);
    01035     AddTrackToSignalBuffer(tile, track, _current_company);
    01036     YapfNotifyTrackLayoutChange(tile, track);
    01037     if (v != NULL) {
    01038       /* Extend the train's path if it's not stopped or loading, or not at a safe position. */
    01039       if (!(((v->vehstatus & VS_STOPPED) && v->cur_speed == 0) || v->current_order.IsType(OT_LOADING)) ||
    01040           !IsSafeWaitingPosition(v, v->tile, v->GetVehicleTrackdir(), true, _settings_game.pf.forbid_90_deg)) {
    01041         TryPathReserve(v, true);
    01042       }
    01043     }
    01044   }
    01045
    01046   return cost;
    01047 }
    01048
    01049 static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
    01050 {
    01051   tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
    01052   if (tile == INVALID_TILE) return false;
    01053
    01054   /* Check for track bits on the new tile */
    01055   TrackdirBits trackdirbits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
    01056
    01057   if (TracksOverlap(TrackdirBitsToTrackBits(trackdirbits))) return false;
    01058   trackdirbits &= TrackdirReachesTrackdirs(trackdir);
    01059
    01060   /* No track bits, must stop */
    01061   if (trackdirbits == TRACKDIR_BIT_NONE) return false;
    01062
    01063   /* Get the first track dir */
    01064   trackdir = RemoveFirstTrackdir(&trackdirbits);
    01065
    01066   /* Any left? It's a junction so we stop */
    01067   if (trackdirbits != TRACKDIR_BIT_NONE) return false;
    01068
    01069   switch (GetTileType(tile)) {
    01070     case MP_RAILWAY:
    01071       if (IsRailDepot(tile)) return false;
    01072       if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
    01073       signal_ctr++;
    01074       if (IsDiagonalTrackdir(trackdir)) {
    01075         signal_ctr++;
    01076         /* Ensure signal_ctr even so X and Y pieces get signals */
    01077         ClrBit(signal_ctr, 0);
    01078       }
    01079       return true;
    01080
    01081     case MP_ROAD:
    01082       if (!IsLevelCrossing(tile)) return false;
    01083       signal_ctr += 2;
    01084       return true;
    01085
    01086     case MP_TUNNELBRIDGE: {
    01087       TileIndex orig_tile = tile; // backup old value
    01088
    01089       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
    01090       if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
    01091
    01092       /* Skip to end of tunnel or bridge
    01093        * note that tile is a parameter by reference, so it must be updated */
    01094       tile = GetOtherTunnelBridgeEnd(tile);
    01095
    01096       signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
    01097       return true;
    01098     }
    01099
    01100     default: return false;
    01101   }
    01102 }
    01103
    01119 static CommandCost CmdSignalTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01120 {
    01121   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
    01122   bool err = true;
    01123   TileIndex start_tile = tile;
    01124
    01125   Track track = (Track)GB(p2, 0, 3);
    01126   bool mode = HasBit(p2, 3);
    01127   bool semaphores = HasBit(p2, 4);
    01128   bool remove = HasBit(p2, 5);
    01129   bool autofill = HasBit(p2, 6);
    01130   Trackdir trackdir = TrackToTrackdir(track);
    01131   byte signal_density = GB(p2, 24, 8);
    01132
    01133   if (p1 >= MapSize()) return CMD_ERROR;
    01134   TileIndex end_tile = p1;
    01135   if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
    01136
    01137   if (!IsPlainRailTile(tile)) return CMD_ERROR;
    01138
    01139   /* for vertical/horizontal tracks, double the given signals density
    01140    * since the original amount will be too dense (shorter tracks) */
    01141   signal_density *= 2;
    01142
    01143   if (ValidateAutoDrag(&trackdir, tile, end_tile).Failed()) return CMD_ERROR;
    01144
    01145   track = TrackdirToTrack(trackdir); // trackdir might have changed, keep track in sync
    01146   Trackdir start_trackdir = trackdir;
    01147
    01148   /* Must start on a valid track to be able to avoid loops */
    01149   if (!HasTrack(tile, track)) return CMD_ERROR;
    01150
    01151   SignalType sigtype = (SignalType)GB(p2, 7, 3);
    01152   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
    01153
    01154   byte signals;
    01155   /* copy the signal-style of the first rail-piece if existing */
    01156   if (HasSignalOnTrack(tile, track)) {
    01157     signals = GetPresentSignals(tile) & SignalOnTrack(track);
    01158     assert(signals != 0);
    01159
    01160     /* copy signal/semaphores style (independent of CTRL) */
    01161     semaphores = GetSignalVariant(tile, track) != SIG_ELECTRIC;
    01162
    01163     sigtype = GetSignalType(tile, track);
    01164     /* Don't but copy pre-signal type */
    01165     if (sigtype < SIGTYPE_PBS) sigtype = SIGTYPE_NORMAL;
    01166   } else { // no signals exist, drag a two-way signal stretch
    01167     signals = IsPbsSignal(sigtype) ? SignalAlongTrackdir(trackdir) : SignalOnTrack(track);
    01168   }
    01169
    01170   byte signal_dir = 0;
    01171   if (signals & SignalAlongTrackdir(trackdir))   SetBit(signal_dir, 0);
    01172   if (signals & SignalAgainstTrackdir(trackdir)) SetBit(signal_dir, 1);
    01173
    01174   /* signal_ctr         - amount of tiles already processed
    01175    * signals_density    - setting to put signal on every Nth tile (double space on |, -- tracks)
    01176    **********
    01177    * trackdir   - trackdir to build with autorail
    01178    * semaphores - semaphores or signals
    01179    * signals    - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
    01180    *              and convert all others to semaphore/signal
    01181    * remove     - 1 remove signals, 0 build signals */
    01182   int signal_ctr = 0;
    01183   for (;;) {
    01184     /* only build/remove signals with the specified density */
    01185     if ((remove && autofill) || signal_ctr % signal_density == 0) {
    01186       uint32 p1 = GB(TrackdirToTrack(trackdir), 0, 3);
    01187       SB(p1, 3, 1, mode);
    01188       SB(p1, 4, 1, semaphores);
    01189       SB(p1, 5, 3, sigtype);
    01190       if (!remove && signal_ctr == 0) SetBit(p1, 17);
    01191
    01192       /* Pick the correct orientation for the track direction */
    01193       signals = 0;
    01194       if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
    01195       if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
    01196
    01197       ret = DoCommand(tile, p1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
    01198
    01199       /* Be user-friendly and try placing signals as much as possible */
    01200       if (ret.Succeeded()) {
    01201         err = false;
    01202         total_cost.AddCost(ret);
    01203       }
    01204     }
    01205
    01206     if (autofill) {
    01207       if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
    01208
    01209       /* Prevent possible loops */
    01210       if (tile == start_tile && trackdir == start_trackdir) break;
    01211     } else {
    01212       if (tile == end_tile) break;
    01213
    01214       tile += ToTileIndexDiff(_trackdelta[trackdir]);
    01215       signal_ctr++;
    01216
    01217       /* toggle railbit for the non-diagonal tracks (|, -- tracks) */
    01218       if (IsDiagonalTrackdir(trackdir)) {
    01219         signal_ctr++;
    01220       } else {
    01221         ToggleBit(trackdir, 0);
    01222       }
    01223     }
    01224   }
    01225
    01226   return err ? CMD_ERROR : total_cost;
    01227 }
    01228
    01246 CommandCost CmdBuildSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01247 {
    01248   return CmdSignalTrackHelper(tile, flags, p1, p2, text);
    01249 }
    01250
    01262 CommandCost CmdRemoveSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01263 {
    01264   Track track = (Track)GB(p1, 0, 3);
    01265
    01266   if (!ValParamTrackOrientation(track) ||
    01267       !IsPlainRailTile(tile) ||
    01268       !HasTrack(tile, track) ||
    01269       !EnsureNoTrainOnTrack(tile, track) ||
    01270       !HasSignalOnTrack(tile, track)) {
    01271     return CMD_ERROR;
    01272   }
    01273
    01274   /* Only water can remove signals from anyone */
    01275   if (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) return CMD_ERROR;
    01276
    01277   /* Do it? */
    01278   if (flags & DC_EXEC) {
    01279     Train *v = NULL;
    01280     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
    01281       v = GetTrainForReservation(tile, track);
    01282     } else if (IsPbsSignal(GetSignalType(tile, track))) {
    01283       /* PBS signal, might be the end of a path reservation. */
    01284       Trackdir td = TrackToTrackdir(track);
    01285       for (int i = 0; v == NULL && i < 2; i++, td = ReverseTrackdir(td)) {
    01286         /* Only test the active signal side. */
    01287         if (!HasSignalOnTrackdir(tile, ReverseTrackdir(td))) continue;
    01288         TileIndex next = TileAddByDiagDir(tile, TrackdirToExitdir(td));
    01289         TrackBits tracks = TrackdirBitsToTrackBits(TrackdirReachesTrackdirs(td));
    01290         if (HasReservedTracks(next, tracks)) {
    01291           v = GetTrainForReservation(next, TrackBitsToTrack(GetReservedTrackbits(next) & tracks));
    01292         }
    01293       }
    01294     }
    01295     SetPresentSignals(tile, GetPresentSignals(tile) & ~SignalOnTrack(track));
    01296
    01297     /* removed last signal from tile? */
    01298     if (GetPresentSignals(tile) == 0) {
    01299       SetSignalStates(tile, 0);
    01300       SetHasSignals(tile, false);
    01301       SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
    01302     }
    01303
    01304     AddTrackToSignalBuffer(tile, track, GetTileOwner(tile));
    01305     YapfNotifyTrackLayoutChange(tile, track);
    01306     if (v != NULL) TryPathReserve(v, false);
    01307
    01308     MarkTileDirtyByTile(tile);
    01309   }
    01310
    01311   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_SIGNALS]);
    01312 }
    01313
    01331 CommandCost CmdRemoveSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01332 {
    01333   return CmdSignalTrackHelper(tile, flags, p1, SetBit(p2, 5), text); // bit 5 is remove bit
    01334 }
    01335
    01337 static Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
    01338 {
    01339   if (v->type != VEH_TRAIN) return NULL;
    01340
    01341   /* Similar checks as in Train::PowerChanged() */
    01342
    01343   Train *t = Train::From(v);
    01344   if (t->IsArticulatedPart()) return NULL;
    01345
    01346   const RailVehicleInfo *rvi = RailVehInfo(t->engine_type);
    01347   if (GetVehicleProperty(t, PROP_TRAIN_POWER, rvi->power) != 0) t->First()->PowerChanged();
    01348
    01349   return NULL;
    01350 }
    01351
    01361 CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01362 {
    01363   CommandCost cost(EXPENSES_CONSTRUCTION);
    01364   RailType totype = (RailType)p2;
    01365
    01366   if (!ValParamRailtype(totype)) return CMD_ERROR;
    01367   if (p1 >= MapSize()) return CMD_ERROR;
    01368
    01369   uint ex = TileX(tile);
    01370   uint ey = TileY(tile);
    01371   uint sx = TileX(p1);
    01372   uint sy = TileY(p1);
    01373
    01374   /* make sure sx,sy are smaller than ex,ey */
    01375   if (ex < sx) Swap(ex, sx);
    01376   if (ey < sy) Swap(ey, sy);
    01377
    01378   _error_message = STR_ERROR_NO_SUITABLE_RAILROAD_TRACK; // by default, there is no track to convert
    01379
    01380   for (uint x = sx; x <= ex; ++x) {
    01381     for (uint y = sy; y <= ey; ++y) {
    01382       TileIndex tile = TileXY(x, y);
    01383       TileType tt = GetTileType(tile);
    01384
    01385       /* Check if there is any track on tile */
    01386       switch (tt) {
    01387         case MP_RAILWAY:
    01388           break;
    01389         case MP_STATION:
    01390           if (!HasStationRail(tile)) continue;
    01391           break;
    01392         case MP_ROAD:
    01393           if (!IsLevelCrossing(tile)) continue;
    01394           break;
    01395         case MP_TUNNELBRIDGE:
    01396           if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
    01397           break;
    01398         default: continue;
    01399       }
    01400
    01401       /* Original railtype we are converting from */
    01402       RailType type = GetRailType(tile);
    01403
    01404       /* Converting to the same type or converting 'hidden' elrail -> rail */
    01405       if (type == totype || (_settings_game.vehicle.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
    01406
    01407       /* Trying to convert other's rail */
    01408       if (!CheckTileOwnership(tile)) continue;
    01409
    01410       SmallVector<Train *, 2> vehicles_affected;
    01411
    01412       /* Vehicle on the tile when not converting Rail <-> ElRail
    01413        * Tunnels and bridges have special check later */
    01414       if (tt != MP_TUNNELBRIDGE) {
    01415         if (!IsCompatibleRail(type, totype) && !EnsureNoVehicleOnGround(tile)) continue;
    01416         if (flags & DC_EXEC) { // we can safely convert, too
    01417           TrackBits reserved = GetReservedTrackbits(tile);
    01418           Track     track;
    01419           while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
    01420             Train *v = GetTrainForReservation(tile, track);
    01421             if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
    01422               /* No power on new rail type, reroute. */
    01423               FreeTrainTrackReservation(v);
    01424               *vehicles_affected.Append() = v;
    01425             }
    01426           }
    01427
    01428           SetRailType(tile, totype);
    01429           MarkTileDirtyByTile(tile);
    01430           /* update power of train engines on this tile */
    01431           FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
    01432         }
    01433       }
    01434
    01435       switch (tt) {
    01436         case MP_RAILWAY:
    01437           switch (GetRailTileType(tile)) {
    01438             case RAIL_TILE_DEPOT:
    01439               if (flags & DC_EXEC) {
    01440                 /* notify YAPF about the track layout change */
    01441                 YapfNotifyTrackLayoutChange(tile, GetRailDepotTrack(tile));
    01442
    01443                 /* Update build vehicle window related to this depot */
    01444                 InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
    01445                 InvalidateWindowData(WC_BUILD_VEHICLE, tile);
    01446               }
    01447               cost.AddCost(RailConvertCost(type, totype));
    01448               break;
    01449
    01450             default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
    01451               if (flags & DC_EXEC) {
    01452                 /* notify YAPF about the track layout change */
    01453                 TrackBits tracks = GetTrackBits(tile);
    01454                 while (tracks != TRACK_BIT_NONE) {
    01455                   YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
    01456                 }
    01457               }
    01458               cost.AddCost(RailConvertCost(type, totype) * CountBits(GetTrackBits(tile)));
    01459               break;
    01460           }
    01461           break;
    01462
    01463         case MP_TUNNELBRIDGE: {
    01464           TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
    01465
    01466           /* If both ends of tunnel/bridge are in the range, do not try to convert twice -
    01467            * it would cause assert because of different test and exec runs */
    01468           if (endtile < tile && TileX(endtile) >= sx && TileX(endtile) <= ex &&
    01469               TileY(endtile) >= sy && TileY(endtile) <= ey) continue;
    01470
    01471           /* When not coverting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
    01472           if (!IsCompatibleRail(GetRailType(tile), totype) &&
    01473               HasVehicleOnTunnelBridge(tile, endtile)) continue;
    01474
    01475           if (flags & DC_EXEC) {
    01476             Track track = DiagDirToDiagTrack(GetTunnelBridgeDirection(tile));
    01477             if (HasTunnelBridgeReservation(tile)) {
    01478               Train *v = GetTrainForReservation(tile, track);
    01479               if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
    01480                 /* No power on new rail type, reroute. */
    01481                 FreeTrainTrackReservation(v);
    01482                 *vehicles_affected.Append() = v;
    01483               }
    01484             }
    01485             SetRailType(tile, totype);
    01486             SetRailType(endtile, totype);
    01487
    01488             FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
    01489             FindVehicleOnPos(endtile, NULL, &UpdateTrainPowerProc);
    01490
    01491             YapfNotifyTrackLayoutChange(tile, track);
    01492             YapfNotifyTrackLayoutChange(endtile, track);
    01493
    01494             MarkTileDirtyByTile(tile);
    01495             MarkTileDirtyByTile(endtile);
    01496
    01497             if (IsBridge(tile)) {
    01498               TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
    01499               TileIndex t = tile + delta;
    01500               for (; t != endtile; t += delta) MarkTileDirtyByTile(t); // TODO encapsulate this into a function
    01501             }
    01502           }
    01503
    01504           cost.AddCost((GetTunnelBridgeLength(tile, endtile) + 2) * RailConvertCost(type, totype));
    01505         } break;
    01506
    01507         default: // MP_STATION, MP_ROAD
    01508           if (flags & DC_EXEC) {
    01509             Track track = ((tt == MP_STATION) ? GetRailStationTrack(tile) : GetCrossingRailTrack(tile));
    01510             YapfNotifyTrackLayoutChange(tile, track);
    01511           }
    01512
    01513           cost.AddCost(RailConvertCost(type, totype));
    01514           break;
    01515       }
    01516
    01517       for (uint i = 0; i < vehicles_affected.Length(); ++i) {
    01518         TryPathReserve(vehicles_affected[i], true);
    01519       }
    01520     }
    01521   }
    01522
    01523   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
    01524 }
    01525
    01526 static CommandCost RemoveTrainDepot(TileIndex tile, DoCommandFlag flags)
    01527 {
    01528   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER)
    01529     return CMD_ERROR;
    01530
    01531   if (!EnsureNoVehicleOnGround(tile))
    01532     return CMD_ERROR;
    01533
    01534   if (flags & DC_EXEC) {
    01535     /* read variables before the depot is removed */
    01536     DiagDirection dir = GetRailDepotDirection(tile);
    01537     Owner owner = GetTileOwner(tile);
    01538     Train *v = NULL;
    01539
    01540     if (HasDepotReservation(tile)) {
    01541       v = GetTrainForReservation(tile, DiagDirToDiagTrack(dir));
    01542       if (v != NULL) FreeTrainTrackReservation(v);
    01543     }
    01544
    01545     delete Depot::GetByTile(tile);
    01546     DoClearSquare(tile);
    01547     AddSideToSignalBuffer(tile, dir, owner);
    01548     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
    01549     if (v != NULL) TryPathReserve(v, true);
    01550   }
    01551
    01552   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_TRAIN]);
    01553 }
    01554
    01555 static CommandCost ClearTile_Track(TileIndex tile, DoCommandFlag flags)
    01556 {
    01557   CommandCost cost(EXPENSES_CONSTRUCTION);
    01558
    01559   if (flags & DC_AUTO) {
    01560     if (!IsTileOwner(tile, _current_company)) {
    01561       return_cmd_error(STR_ERROR_AREA_IS_OWNED_BY_ANOTHER);
    01562     }
    01563
    01564     if (IsPlainRail(tile)) {
    01565       return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
    01566     } else {
    01567       return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
    01568     }
    01569   }
    01570
    01571   switch (GetRailTileType(tile)) {
    01572     case RAIL_TILE_SIGNALS:
    01573     case RAIL_TILE_NORMAL: {
    01574       Slope tileh = GetTileSlope(tile, NULL);
    01575       /* Is there flat water on the lower halftile, that gets cleared expensively? */
    01576       bool water_ground = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh));
    01577
    01578       TrackBits tracks = GetTrackBits(tile);
    01579       while (tracks != TRACK_BIT_NONE) {
    01580         Track track = RemoveFirstTrack(&tracks);
    01581         CommandCost ret = DoCommand(tile, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
    01582         if (ret.Failed()) return CMD_ERROR;
    01583         cost.AddCost(ret);
    01584       }
    01585
    01586       /* when bankrupting, don't make water dirty, there could be a ship on lower halftile */
    01587       if (water_ground && !(flags & DC_BANKRUPT)) {
    01588         if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    01589
    01590         /* The track was removed, and left a coast tile. Now also clear the water. */
    01591         if (flags & DC_EXEC) DoClearSquare(tile);
    01592         cost.AddCost(_price[PR_CLEAR_WATER]);
    01593       }
    01594
    01595       return cost;
    01596     }
    01597
    01598     case RAIL_TILE_DEPOT:
    01599       return RemoveTrainDepot(tile, flags);
    01600
    01601     default:
    01602       return CMD_ERROR;
    01603   }
    01604 }
    01605
    01610 static uint GetSaveSlopeZ(uint x, uint y, Track track)
    01611 {
    01612   switch (track) {
    01613     case TRACK_UPPER: x &= ~0xF; y &= ~0xF; break;
    01614     case TRACK_LOWER: x |=  0xF; y |=  0xF; break;
    01615     case TRACK_LEFT:  x |=  0xF; y &= ~0xF; break;
    01616     case TRACK_RIGHT: x &= ~0xF; y |=  0xF; break;
    01617     default: break;
    01618   }
    01619   return GetSlopeZ(x, y);
    01620 }
    01621
    01622 static void DrawSingleSignal(TileIndex tile, Track track, byte condition, uint image, uint pos)
    01623 {
    01624   bool side = (_settings_game.vehicle.road_side != 0) && _settings_game.construction.signal_side;
    01625   static const Point SignalPositions[2][12] = {
    01626     { // Signals on the left side
    01627     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01628       { 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
    01629     /*  LOWER     LOWER     X         X         Y         Y     */
    01630       {11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
    01631     }, { // Signals on the right side
    01632     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01633       {14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
    01634     /*  LOWER     LOWER     X         X         Y         Y     */
    01635       {14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
    01636     }
    01637   };
    01638
    01639   uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
    01640   uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
    01641
    01642   SpriteID sprite;
    01643
    01644   SignalType type       = GetSignalType(tile, track);
    01645   SignalVariant variant = GetSignalVariant(tile, track);
    01646
    01647   if (type == SIGTYPE_NORMAL && variant == SIG_ELECTRIC) {
    01648     /* Normal electric signals are picked from original sprites. */
    01649     sprite = SPR_ORIGINAL_SIGNALS_BASE + image + condition;
    01650   } else {
    01651     /* All other signals are picked from add on sprites. */
    01652     sprite = SPR_SIGNALS_BASE + (type - 1) * 16 + variant * 64 + image + condition + (type > SIGTYPE_LAST_NOPBS ? 64 : 0);
    01653   }
    01654
    01655   AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, GetSaveSlopeZ(x, y, track));
    01656 }
    01657
    01658 static uint32 _drawtile_track_palette;
    01659
    01660
    01661 static void DrawTrackFence_NW(const TileInfo *ti, SpriteID base_image)
    01662 {
    01663   RailFenceOffset rfo = RFO_FLAT_X;
    01664   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
    01665   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01666     ti->x, ti->y + 1, 16, 1, 4, ti->z);
    01667 }
    01668
    01669 static void DrawTrackFence_SE(const TileInfo *ti, SpriteID base_image)
    01670 {
    01671   RailFenceOffset rfo = RFO_FLAT_X;
    01672   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
    01673   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01674     ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
    01675 }
    01676
    01677 static void DrawTrackFence_NW_SE(const TileInfo *ti, SpriteID base_image)
    01678 {
    01679   DrawTrackFence_NW(ti, base_image);
    01680   DrawTrackFence_SE(ti, base_image);
    01681 }
    01682
    01683 static void DrawTrackFence_NE(const TileInfo *ti, SpriteID base_image)
    01684 {
    01685   RailFenceOffset rfo = RFO_FLAT_Y;
    01686   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
    01687   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01688     ti->x + 1, ti->y, 1, 16, 4, ti->z);
    01689 }
    01690
    01691 static void DrawTrackFence_SW(const TileInfo *ti, SpriteID base_image)
    01692 {
    01693   RailFenceOffset rfo = RFO_FLAT_Y;
    01694   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
    01695   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01696     ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
    01697 }
    01698
    01699 static void DrawTrackFence_NE_SW(const TileInfo *ti, SpriteID base_image)
    01700 {
    01701   DrawTrackFence_NE(ti, base_image);
    01702   DrawTrackFence_SW(ti, base_image);
    01703 }
    01704
    01708 static void DrawTrackFence_NS_1(const TileInfo *ti, SpriteID base_image)
    01709 {
    01710   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_W);
    01711   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
    01712     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01713 }
    01714
    01718 static void DrawTrackFence_NS_2(const TileInfo *ti, SpriteID base_image)
    01719 {
    01720   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_E);
    01721   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
    01722     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01723 }
    01724
    01728 static void DrawTrackFence_WE_1(const TileInfo *ti, SpriteID base_image)
    01729 {
    01730   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_N);
    01731   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
    01732     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01733 }
    01734
    01738 static void DrawTrackFence_WE_2(const TileInfo *ti, SpriteID base_image)
    01739 {
    01740   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_S);
    01741   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
    01742     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01743 }
    01744
    01745
    01746 static void DrawTrackDetails(const TileInfo *ti, const RailtypeInfo *rti)
    01747 {
    01748   /* Base sprite for track fences. */
    01749   SpriteID base_image = GetCustomRailSprite(rti, ti->tile, RTSG_FENCES);
    01750   if (base_image == 0) base_image = SPR_TRACK_FENCE_FLAT_X;
    01751
    01752   switch (GetRailGroundType(ti->tile)) {
    01753     case RAIL_GROUND_FENCE_NW:     DrawTrackFence_NW(ti, base_image);    break;
    01754     case RAIL_GROUND_FENCE_SE:     DrawTrackFence_SE(ti, base_image);    break;
    01755     case RAIL_GROUND_FENCE_SENW:   DrawTrackFence_NW_SE(ti, base_image); break;
    01756     case RAIL_GROUND_FENCE_NE:     DrawTrackFence_NE(ti, base_image);    break;
    01757     case RAIL_GROUND_FENCE_SW:     DrawTrackFence_SW(ti, base_image);    break;
    01758     case RAIL_GROUND_FENCE_NESW:   DrawTrackFence_NE_SW(ti, base_image); break;
    01759     case RAIL_GROUND_FENCE_VERT1:  DrawTrackFence_NS_1(ti, base_image);  break;
    01760     case RAIL_GROUND_FENCE_VERT2:  DrawTrackFence_NS_2(ti, base_image);  break;
    01761     case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti, base_image);  break;
    01762     case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti, base_image);  break;
    01763     case RAIL_GROUND_WATER: {
    01764       Corner track_corner;
    01765       if (IsHalftileSlope(ti->tileh)) {
    01766         /* Steep slope or one-corner-raised slope with halftile foundation */
    01767         track_corner = GetHalftileSlopeCorner(ti->tileh);
    01768       } else {
    01769         /* Three-corner-raised slope */
    01770         track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    01771       }
    01772       switch (track_corner) {
    01773         case CORNER_W: DrawTrackFence_NS_1(ti, base_image); break;
    01774         case CORNER_S: DrawTrackFence_WE_2(ti, base_image); break;
    01775         case CORNER_E: DrawTrackFence_NS_2(ti, base_image); break;
    01776         case CORNER_N: DrawTrackFence_WE_1(ti, base_image); break;
    01777         default: NOT_REACHED();
    01778       }
    01779       break;
    01780     }
    01781     default: break;
    01782   }
    01783 }
    01784
    01785 /* SubSprite for drawing the track halftile of 'three-corners-raised'-sloped rail sprites. */
    01786 static const int INF = 1000; // big number compared to tilesprite size
    01787 static const SubSprite _halftile_sub_sprite[4] = {
    01788   { -INF    , -INF  , 32 - 33, INF     }, // CORNER_W, clip 33 pixels from right
    01789   { -INF    ,  0 + 7, INF    , INF     }, // CORNER_S, clip 7 pixels from top
    01790   { -31 + 33, -INF  , INF    , INF     }, // CORNER_E, clip 33 pixels from left
    01791   { -INF    , -INF  , INF    , 30 - 23 }  // CORNER_N, clip 23 pixels from bottom
    01792 };
    01793
    01794 static inline void DrawTrackSprite(SpriteID sprite, PaletteID pal, const TileInfo *ti, Slope s)
    01795 {
    01796   DrawGroundSprite(sprite, pal, NULL, 0, (ti->tileh & s) ? -8 : 0);
    01797 }
    01798
    01799 static void DrawTrackBitsOverlay(TileInfo *ti, TrackBits track, const RailtypeInfo *rti)
    01800 {
    01801   RailGroundType rgt = GetRailGroundType(ti->tile);
    01802   Foundation f = GetRailFoundation(ti->tileh, track);
    01803   Corner halftile_corner = CORNER_INVALID;
    01804
    01805   if (IsNonContinuousFoundation(f)) {
    01806     /* Save halftile corner */
    01807     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
    01808     /* Draw lower part first */
    01809     track &= ~CornerToTrackBits(halftile_corner);
    01810     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
    01811   }
    01812
    01813   DrawFoundation(ti, f);
    01814   /* DrawFoundation modifies ti */
    01815
    01816   /* Draw ground */
    01817   if (track == TRACK_BIT_NONE && rgt == RAIL_GROUND_WATER) {
    01818     if (IsSteepSlope(ti->tileh)) {
    01819       DrawShoreTile(ti->tileh);
    01820     } else {
    01821       DrawGroundSprite(SPR_FLAT_WATER_TILE, PAL_NONE);
    01822     }
    01823   } else {
    01824     SpriteID image;
    01825
    01826     switch (rgt) {
    01827       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01828       case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
    01829       default:                     image = SPR_FLAT_GRASS_TILE; break;
    01830     }
    01831
    01832     image += _tileh_to_sprite[ti->tileh];
    01833
    01834     DrawGroundSprite(image, PAL_NONE);
    01835   }
    01836
    01837   SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
    01838   SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
    01839   TrackBits pbs = _settings_client.gui.show_track_reservation ? GetRailReservationTrackBits(ti->tile) : TRACK_BIT_NONE;
    01840
    01841   if (track == TRACK_BIT_NONE) {
    01842     /* Half-tile foundation, no track here? */
    01843   } else if (ti->tileh == SLOPE_NW && track == TRACK_BIT_Y) {
    01844     DrawGroundSprite(ground + RTO_SLOPE_NW, PAL_NONE);
    01845     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 9, PALETTE_CRASH);
    01846   } else if (ti->tileh == SLOPE_NE && track == TRACK_BIT_X) {
    01847     DrawGroundSprite(ground + RTO_SLOPE_NE, PAL_NONE);
    01848     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 6, PALETTE_CRASH);
    01849   } else if (ti->tileh == SLOPE_SE && track == TRACK_BIT_Y) {
    01850     DrawGroundSprite(ground + RTO_SLOPE_SE, PAL_NONE);
    01851     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 7, PALETTE_CRASH);
    01852   } else if (ti->tileh == SLOPE_SW && track == TRACK_BIT_X) {
    01853     DrawGroundSprite(ground + RTO_SLOPE_SW, PAL_NONE);
    01854     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 8, PALETTE_CRASH);
    01855   } else {
    01856     switch (track) {
    01857       /* Draw single ground sprite when not overlapping. No track overlay
    01858        * is necessary for these sprites. */
    01859       case TRACK_BIT_X:     DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
    01860       case TRACK_BIT_Y:     DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
    01861       case TRACK_BIT_UPPER: DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N); break;
    01862       case TRACK_BIT_LOWER: DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
    01863       case TRACK_BIT_RIGHT: DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E); break;
    01864       case TRACK_BIT_LEFT:  DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
    01865       case TRACK_BIT_CROSS: DrawGroundSprite(ground + RTO_CROSSING_XY, PAL_NONE); break;
    01866       case TRACK_BIT_HORZ:  DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N);
    01867                             DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
    01868       case TRACK_BIT_VERT:  DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E);
    01869                             DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
    01870
    01871       default:
    01872         /* We're drawing a junction tile */
    01873         if ((track & TRACK_BIT_3WAY_NE) == 0) {
    01874           DrawGroundSprite(ground + RTO_JUNCTION_SW, PAL_NONE);
    01875         } else if ((track & TRACK_BIT_3WAY_SW) == 0) {
    01876           DrawGroundSprite(ground + RTO_JUNCTION_NE, PAL_NONE);
    01877         } else if ((track & TRACK_BIT_3WAY_NW) == 0) {
    01878           DrawGroundSprite(ground + RTO_JUNCTION_SE, PAL_NONE);
    01879         } else if ((track & TRACK_BIT_3WAY_SE) == 0) {
    01880           DrawGroundSprite(ground + RTO_JUNCTION_NW, PAL_NONE);
    01881         } else {
    01882           DrawGroundSprite(ground + RTO_JUNCTION_NSEW, PAL_NONE);
    01883         }
    01884
    01885         /* Mask out PBS bits as we shall draw them afterwards anyway. */
    01886         track &= ~pbs;
    01887
    01888         /* Draw regular track bits */
    01889         if (track & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PAL_NONE);
    01890         if (track & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PAL_NONE);
    01891         if (track & TRACK_BIT_UPPER) DrawGroundSprite(overlay + RTO_N, PAL_NONE);
    01892         if (track & TRACK_BIT_LOWER) DrawGroundSprite(overlay + RTO_S, PAL_NONE);
    01893         if (track & TRACK_BIT_RIGHT) DrawGroundSprite(overlay + RTO_E, PAL_NONE);
    01894         if (track & TRACK_BIT_LEFT)  DrawGroundSprite(overlay + RTO_W, PAL_NONE);
    01895     }
    01896
    01897     /* Draw reserved track bits */
    01898     if (pbs & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH);
    01899     if (pbs & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH);
    01900     if (pbs & TRACK_BIT_UPPER) DrawTrackSprite(overlay + RTO_N, PALETTE_CRASH, ti, SLOPE_N);
    01901     if (pbs & TRACK_BIT_LOWER) DrawTrackSprite(overlay + RTO_S, PALETTE_CRASH, ti, SLOPE_S);
    01902     if (pbs & TRACK_BIT_RIGHT) DrawTrackSprite(overlay + RTO_E, PALETTE_CRASH, ti, SLOPE_E);
    01903     if (pbs & TRACK_BIT_LEFT)  DrawTrackSprite(overlay + RTO_W, PALETTE_CRASH, ti, SLOPE_W);
    01904   }
    01905
    01906   if (IsValidCorner(halftile_corner)) {
    01907     DrawFoundation(ti, HalftileFoundation(halftile_corner));
    01908
    01909     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
    01910     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    01911
    01912     SpriteID image;
    01913     switch (rgt) {
    01914       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01915       case RAIL_GROUND_ICE_DESERT:
    01916       case RAIL_GROUND_HALF_SNOW:  image = SPR_FLAT_SNOW_DESERT_TILE; break;
    01917       default:                     image = SPR_FLAT_GRASS_TILE; break;
    01918     }
    01919
    01920     image += _tileh_to_sprite[fake_slope];
    01921
    01922     DrawGroundSprite(image, PAL_NONE, &(_halftile_sub_sprite[halftile_corner]));
    01923
    01924     track = CornerToTrackBits(halftile_corner);
    01925
    01926     int offset;
    01927     switch (track) {
    01928       default: NOT_REACHED();
    01929       case TRACK_BIT_UPPER: offset = RTO_N; break;
    01930       case TRACK_BIT_LOWER: offset = RTO_S; break;
    01931       case TRACK_BIT_RIGHT: offset = RTO_E; break;
    01932       case TRACK_BIT_LEFT:  offset = RTO_W; break;
    01933     }
    01934
    01935     DrawTrackSprite(ground + offset, PAL_NONE, ti, fake_slope);
    01936     if (HasReservedTracks(ti->tile, track)) {
    01937       DrawTrackSprite(overlay + offset, PALETTE_CRASH, ti, fake_slope);
    01938     }
    01939   }
    01940 }
    01941
    01947 static void DrawTrackBits(TileInfo *ti, TrackBits track)
    01948 {
    01949   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    01950
    01951   if (rti->UsesOverlay()) {
    01952     DrawTrackBitsOverlay(ti, track, rti);
    01953     return;
    01954   }
    01955
    01956   RailGroundType rgt = GetRailGroundType(ti->tile);
    01957   Foundation f = GetRailFoundation(ti->tileh, track);
    01958   Corner halftile_corner = CORNER_INVALID;
    01959
    01960   if (IsNonContinuousFoundation(f)) {
    01961     /* Save halftile corner */
    01962     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
    01963     /* Draw lower part first */
    01964     track &= ~CornerToTrackBits(halftile_corner);
    01965     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
    01966   }
    01967
    01968   DrawFoundation(ti, f);
    01969   /* DrawFoundation modifies ti */
    01970
    01971   SpriteID image;
    01972   PaletteID pal = PAL_NONE;
    01973   const SubSprite *sub = NULL;
    01974   bool junction = false;
    01975
    01976   /* Select the sprite to use. */
    01977   if (track == 0) {
    01978     /* Clear ground (only track on halftile foundation) */
    01979     if (rgt == RAIL_GROUND_WATER) {
    01980       if (IsSteepSlope(ti->tileh)) {
    01981         DrawShoreTile(ti->tileh);
    01982         image = 0;
    01983       } else {
    01984         image = SPR_FLAT_WATER_TILE;
    01985       }
    01986     } else {
    01987       switch (rgt) {
    01988         case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01989         case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
    01990         default:                     image = SPR_FLAT_GRASS_TILE; break;
    01991       }
    01992       image += _tileh_to_sprite[ti->tileh];
    01993     }
    01994   } else {
    01995     if (ti->tileh != SLOPE_FLAT) {
    01996       /* track on non-flat ground */
    01997       image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
    01998     } else {
    01999       /* track on flat ground */
    02000       (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
    02001       (image++,                           track == TRACK_BIT_X) ||
    02002       (image++,                           track == TRACK_BIT_UPPER) ||
    02003       (image++,                           track == TRACK_BIT_LOWER) ||
    02004       (image++,                           track == TRACK_BIT_RIGHT) ||
    02005       (image++,                           track == TRACK_BIT_LEFT) ||
    02006       (image++,                           track == TRACK_BIT_CROSS) ||
    02007
    02008       (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
    02009       (image++,                            track == TRACK_BIT_VERT) ||
    02010
    02011       (junction = true, false) ||
    02012       (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
    02013       (image++,                          (track & TRACK_BIT_3WAY_SW) == 0) ||
    02014       (image++,                          (track & TRACK_BIT_3WAY_NW) == 0) ||
    02015       (image++,                          (track & TRACK_BIT_3WAY_SE) == 0) ||
    02016       (image++, true);
    02017     }
    02018
    02019     switch (rgt) {
    02020       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    02021       case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset;  break;
    02022       case RAIL_GROUND_WATER: {
    02023         /* three-corner-raised slope */
    02024         DrawShoreTile(ti->tileh);
    02025         Corner track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    02026         sub = &(_halftile_sub_sprite[track_corner]);
    02027         break;
    02028       }
    02029       default: break;
    02030     }
    02031   }
    02032
    02033   if (image != 0) DrawGroundSprite(image, pal, sub);
    02034
    02035   /* Draw track pieces individually for junction tiles */
    02036   if (junction) {
    02037     if (track & TRACK_BIT_X)     DrawGroundSprite(rti->base_sprites.single_x, PAL_NONE);
    02038     if (track & TRACK_BIT_Y)     DrawGroundSprite(rti->base_sprites.single_y, PAL_NONE);
    02039     if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PAL_NONE);
    02040     if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PAL_NONE);
    02041     if (track & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PAL_NONE);
    02042     if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PAL_NONE);
    02043   }
    02044
    02045   /* PBS debugging, draw reserved tracks darker */
    02046   if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation) {
    02047     /* Get reservation, but mask track on halftile slope */
    02048     TrackBits pbs = GetRailReservationTrackBits(ti->tile) & track;
    02049     if (pbs & TRACK_BIT_X) {
    02050       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
    02051         DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH);
    02052       } else {
    02053         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
    02054       }
    02055     }
    02056     if (pbs & TRACK_BIT_Y) {
    02057       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
    02058         DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH);
    02059       } else {
    02060         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
    02061       }
    02062     }
    02063     if (pbs & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_N ? -TILE_HEIGHT : 0);
    02064     if (pbs & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_S ? -TILE_HEIGHT : 0);
    02065     if (pbs & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_W ? -TILE_HEIGHT : 0);
    02066     if (pbs & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_E ? -TILE_HEIGHT : 0);
    02067   }
    02068
    02069   if (IsValidCorner(halftile_corner)) {
    02070     DrawFoundation(ti, HalftileFoundation(halftile_corner));
    02071
    02072     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
    02073     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    02074     image = _track_sloped_sprites[fake_slope - 1] + rti->base_sprites.track_y;
    02075     pal = PAL_NONE;
    02076     switch (rgt) {
    02077       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    02078       case RAIL_GROUND_ICE_DESERT:
    02079       case RAIL_GROUND_HALF_SNOW:  image += rti->snow_offset;  break; // higher part has snow in this case too
    02080       default: break;
    02081     }
    02082     DrawGroundSprite(image, pal, &(_halftile_sub_sprite[halftile_corner]));
    02083
    02084     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, CornerToTrackBits(halftile_corner))) {
    02085       static const byte _corner_to_track_sprite[] = {3, 1, 2, 0};
    02086       DrawGroundSprite(_corner_to_track_sprite[halftile_corner] + rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, -TILE_HEIGHT);
    02087     }
    02088   }
    02089 }
    02090
    02096 enum {
    02097   SIGNAL_TO_SOUTHWEST =  0,
    02098   SIGNAL_TO_NORTHEAST =  2,
    02099   SIGNAL_TO_SOUTHEAST =  4,
    02100   SIGNAL_TO_NORTHWEST =  6,
    02101   SIGNAL_TO_EAST      =  8,
    02102   SIGNAL_TO_WEST      = 10,
    02103   SIGNAL_TO_SOUTH     = 12,
    02104   SIGNAL_TO_NORTH     = 14,
    02105 };
    02106
    02107 static void DrawSignals(TileIndex tile, TrackBits rails)
    02108 {
    02109 #define MAYBE_DRAW_SIGNAL(x, y, z, t) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, t, GetSingleSignalState(tile, x), y, z)
    02110
    02111   if (!(rails & TRACK_BIT_Y)) {
    02112     if (!(rails & TRACK_BIT_X)) {
    02113       if (rails & TRACK_BIT_LEFT) {
    02114         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTH, 0, TRACK_LEFT);
    02115         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTH, 1, TRACK_LEFT);
    02116       }
    02117       if (rails & TRACK_BIT_RIGHT) {
    02118         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_NORTH, 2, TRACK_RIGHT);
    02119         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_SOUTH, 3, TRACK_RIGHT);
    02120       }
    02121       if (rails & TRACK_BIT_UPPER) {
    02122         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_WEST, 4, TRACK_UPPER);
    02123         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_EAST, 5, TRACK_UPPER);
    02124       }
    02125       if (rails & TRACK_BIT_LOWER) {
    02126         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_WEST, 6, TRACK_LOWER);
    02127         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_EAST, 7, TRACK_LOWER);
    02128       }
    02129     } else {
    02130       MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHWEST, 8, TRACK_X);
    02131       MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHEAST, 9, TRACK_X);
    02132     }
    02133   } else {
    02134     MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHEAST, 10, TRACK_Y);
    02135     MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHWEST, 11, TRACK_Y);
    02136   }
    02137 }
    02138
    02139 static void DrawTile_Track(TileInfo *ti)
    02140 {
    02141   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    02142
    02143   _drawtile_track_palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
    02144
    02145   if (IsPlainRail(ti->tile)) {
    02146     TrackBits rails = GetTrackBits(ti->tile);
    02147
    02148     DrawTrackBits(ti, rails);
    02149
    02150     if (HasBit(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti, rti);
    02151
    02152     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    02153
    02154     if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
    02155   } else {
    02156     /* draw depot */
    02157     const DrawTileSprites *dts;
    02158     PaletteID pal = PAL_NONE;
    02159     SpriteID relocation;
    02160
    02161     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
    02162
    02163     if (IsInvisibilitySet(TO_BUILDINGS)) {
    02164       /* Draw rail instead of depot */
    02165       dts = &_depot_invisible_gfx_table[GetRailDepotDirection(ti->tile)];
    02166     } else {
    02167       dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
    02168     }
    02169
    02170     SpriteID image;
    02171     if (rti->UsesOverlay()) {
    02172       image = SPR_FLAT_GRASS_TILE;
    02173     } else {
    02174       image = dts->ground.sprite;
    02175       if (image != SPR_FLAT_GRASS_TILE) image += rti->total_offset;
    02176     }
    02177
    02178     /* adjust ground tile for desert
    02179      * don't adjust for snow, because snow in depots looks weird */
    02180     if (IsSnowRailGround(ti->tile) && _settings_game.game_creation.landscape == LT_TROPIC) {
    02181       if (image != SPR_FLAT_GRASS_TILE) {
    02182         image += rti->snow_offset; // tile with tracks
    02183       } else {
    02184         image = SPR_FLAT_SNOW_DESERT_TILE; // flat ground
    02185       }
    02186     }
    02187
    02188     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, _drawtile_track_palette));
    02189
    02190     if (rti->UsesOverlay()) {
    02191       SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
    02192
    02193       switch (GetRailDepotDirection(ti->tile)) {
    02194         case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02195         case DIAGDIR_SW: DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
    02196         case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02197         case DIAGDIR_SE: DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
    02198         default: break;
    02199       }
    02200
    02201       if (_settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
    02202         SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
    02203
    02204         switch (GetRailDepotDirection(ti->tile)) {
    02205           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02206           case DIAGDIR_SW: DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH); break;
    02207           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02208           case DIAGDIR_SE: DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH); break;
    02209           default: break;
    02210         }
    02211       }
    02212
    02213       relocation  = GetCustomRailSprite(rti, ti->tile, RTSG_DEPOT);
    02214       relocation -= SPR_RAIL_DEPOT_SE_1;
    02215     } else {
    02216       /* PBS debugging, draw reserved tracks darker */
    02217       if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
    02218         switch (GetRailDepotDirection(ti->tile)) {
    02219           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02220           case DIAGDIR_SW: DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH); break;
    02221           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02222           case DIAGDIR_SE: DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH); break;
    02223           default: break;
    02224         }
    02225       }
    02226
    02227       relocation = rti->total_offset;
    02228     }
    02229
    02230     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    02231
    02232     DrawRailTileSeq(ti, dts, TO_BUILDINGS, relocation, 0, _drawtile_track_palette);
    02233   }
    02234   DrawBridgeMiddle(ti);
    02235 }
    02236
    02237 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
    02238 {
    02239   const DrawTileSprites *dts = &_depot_gfx_table[dir];
    02240   const RailtypeInfo *rti = GetRailTypeInfo(railtype);
    02241   SpriteID image = rti->UsesOverlay() ? SPR_FLAT_GRASS_TILE : dts->ground.sprite;
    02242   uint32 offset = rti->total_offset;
    02243
    02244   x += 33;
    02245   y += 17;
    02246
    02247   if (image != SPR_FLAT_GRASS_TILE) image += offset;
    02248   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
    02249
    02250   DrawSprite(image, PAL_NONE, x, y);
    02251
    02252   if (rti->UsesOverlay()) {
    02253     SpriteID ground = GetCustomRailSprite(rti, INVALID_TILE, RTSG_GROUND);
    02254
    02255     switch (dir) {
    02256       case DIAGDIR_SW: DrawSprite(ground + RTO_X, PAL_NONE, x, y); break;
    02257       case DIAGDIR_SE: DrawSprite(ground + RTO_Y, PAL_NONE, x, y); break;
    02258       default: break;
    02259     }
    02260
    02261     offset  = GetCustomRailSprite(rti, INVALID_TILE, RTSG_DEPOT);
    02262     offset -= SPR_RAIL_DEPOT_SE_1;
    02263   }
    02264
    02265   DrawRailTileSeqInGUI(x, y, dts, offset, 0, palette);
    02266 }
    02267
    02268 static uint GetSlopeZ_Track(TileIndex tile, uint x, uint y)
    02269 {
    02270   uint z;
    02271   Slope tileh = GetTileSlope(tile, &z);
    02272
    02273   if (tileh == SLOPE_FLAT) return z;
    02274   if (IsPlainRail(tile)) {
    02275     z += ApplyFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
    02276     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
    02277   } else {
    02278     return z + TILE_HEIGHT;
    02279   }
    02280 }
    02281
    02282 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
    02283 {
    02284   return IsPlainRail(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
    02285 }
    02286
    02287 static void TileLoop_Track(TileIndex tile)
    02288 {
    02289   RailGroundType old_ground = GetRailGroundType(tile);
    02290   RailGroundType new_ground;
    02291
    02292   if (old_ground == RAIL_GROUND_WATER) {
    02293     TileLoop_Water(tile);
    02294     return;
    02295   }
    02296
    02297   switch (_settings_game.game_creation.landscape) {
    02298     case LT_ARCTIC: {
    02299       uint z;
    02300       Slope slope = GetTileSlope(tile, &z);
    02301       bool half = false;
    02302
    02303       /* for non-flat track, use lower part of track
    02304        * in other cases, use the highest part with track */
    02305       if (IsPlainRail(tile)) {
    02306         TrackBits track = GetTrackBits(tile);
    02307         Foundation f = GetRailFoundation(slope, track);
    02308
    02309         switch (f) {
    02310           case FOUNDATION_NONE:
    02311             /* no foundation - is the track on the upper side of three corners raised tile? */
    02312             if (IsSlopeWithThreeCornersRaised(slope)) z += TILE_HEIGHT;
    02313             break;
    02314
    02315           case FOUNDATION_INCLINED_X:
    02316           case FOUNDATION_INCLINED_Y:
    02317             /* sloped track - is it on a steep slope? */
    02318             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    02319             break;
    02320
    02321           case FOUNDATION_STEEP_LOWER:
    02322             /* only lower part of steep slope */
    02323             z += TILE_HEIGHT;
    02324             break;
    02325
    02326           default:
    02327             /* if it is a steep slope, then there is a track on higher part */
    02328             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    02329             z += TILE_HEIGHT;
    02330             break;
    02331         }
    02332
    02333         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
    02334       } else {
    02335         /* is the depot on a non-flat tile? */
    02336         if (slope != SLOPE_FLAT) z += TILE_HEIGHT;
    02337       }
    02338
    02339       /* 'z' is now the lowest part of the highest track bit -
    02340        * for sloped track, it is 'z' of lower part
    02341        * for two track bits, it is 'z' of higher track bit
    02342        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
    02343       if (z > GetSnowLine()) {
    02344         if (half && z - GetSnowLine() == TILE_HEIGHT) {
    02345           /* track on non-continuous foundation, lower part is not under snow */
    02346           new_ground = RAIL_GROUND_HALF_SNOW;
    02347         } else {
    02348           new_ground = RAIL_GROUND_ICE_DESERT;
    02349         }
    02350         goto set_ground;
    02351       }
    02352       break;
    02353       }
    02354
    02355     case LT_TROPIC:
    02356       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
    02357         new_ground = RAIL_GROUND_ICE_DESERT;
    02358         goto set_ground;
    02359       }
    02360       break;
    02361   }
    02362
    02363   if (!IsPlainRail(tile)) return;
    02364
    02365   new_ground = RAIL_GROUND_GRASS;
    02366
    02367   if (old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
    02368     /* determine direction of fence */
    02369     TrackBits rail = GetTrackBits(tile);
    02370
    02371     switch (rail) {
    02372       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
    02373       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
    02374       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
    02375       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
    02376
    02377       default: {
    02378         Owner owner = GetTileOwner(tile);
    02379
    02380         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
    02381               (rail & TRACK_BIT_3WAY_NW) == 0 &&
    02382               (rail & TRACK_BIT_X)
    02383             )) {
    02384           TileIndex n = tile + TileDiffXY(0, -1);
    02385           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02386
    02387           if (!IsTileType(n, MP_RAILWAY) ||
    02388               !IsTileOwner(n, owner) ||
    02389               nrail == TRACK_BIT_UPPER ||
    02390               nrail == TRACK_BIT_LEFT) {
    02391             new_ground = RAIL_GROUND_FENCE_NW;
    02392           }
    02393         }
    02394
    02395         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
    02396               (rail & TRACK_BIT_3WAY_SE) == 0 &&
    02397               (rail & TRACK_BIT_X)
    02398             )) {
    02399           TileIndex n = tile + TileDiffXY(0, 1);
    02400           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02401
    02402           if (!IsTileType(n, MP_RAILWAY) ||
    02403               !IsTileOwner(n, owner) ||
    02404               nrail == TRACK_BIT_LOWER ||
    02405               nrail == TRACK_BIT_RIGHT) {
    02406             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
    02407               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
    02408           }
    02409         }
    02410
    02411         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
    02412               (rail & TRACK_BIT_3WAY_NE) == 0 &&
    02413               (rail & TRACK_BIT_Y)
    02414             )) {
    02415           TileIndex n = tile + TileDiffXY(-1, 0);
    02416           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02417
    02418           if (!IsTileType(n, MP_RAILWAY) ||
    02419               !IsTileOwner(n, owner) ||
    02420               nrail == TRACK_BIT_UPPER ||
    02421               nrail == TRACK_BIT_RIGHT) {
    02422             new_ground = RAIL_GROUND_FENCE_NE;
    02423           }
    02424         }
    02425
    02426         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
    02427               (rail & TRACK_BIT_3WAY_SW) == 0 &&
    02428               (rail & TRACK_BIT_Y)
    02429             )) {
    02430           TileIndex n = tile + TileDiffXY(1, 0);
    02431           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02432
    02433           if (!IsTileType(n, MP_RAILWAY) ||
    02434               !IsTileOwner(n, owner) ||
    02435               nrail == TRACK_BIT_LOWER ||
    02436               nrail == TRACK_BIT_LEFT) {
    02437             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
    02438               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
    02439           }
    02440         }
    02441         break;
    02442       }
    02443     }
    02444   }
    02445
    02446 set_ground:
    02447   if (old_ground != new_ground) {
    02448     SetRailGroundType(tile, new_ground);
    02449     MarkTileDirtyByTile(tile);
    02450   }
    02451 }
    02452
    02453
    02454 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
    02455 {
    02456   /* Case of half tile slope with water. */
    02457   if (mode == TRANSPORT_WATER && IsPlainRail(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
    02458     TrackBits tb = GetTrackBits(tile);
    02459     switch (tb) {
    02460       default: NOT_REACHED();
    02461       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
    02462       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
    02463       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
    02464       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
    02465     }
    02466     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
    02467   }
    02468
    02469   if (mode != TRANSPORT_RAIL) return 0;
    02470
    02471   TrackBits trackbits = TRACK_BIT_NONE;
    02472   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
    02473
    02474   switch (GetRailTileType(tile)) {
    02475     default: NOT_REACHED();
    02476     case RAIL_TILE_NORMAL:
    02477       trackbits = GetTrackBits(tile);
    02478       break;
    02479
    02480     case RAIL_TILE_SIGNALS: {
    02481       trackbits = GetTrackBits(tile);
    02482       byte a = GetPresentSignals(tile);
    02483       uint b = GetSignalStates(tile);
    02484
    02485       b &= a;
    02486
    02487       /* When signals are not present (in neither direction),
    02488        * we pretend them to be green. Otherwise, it depends on
    02489        * the signal type. For signals that are only active from
    02490        * one side, we set the missing signals explicitely to
    02491        * `green'. Otherwise, they implicitely become `red'. */
    02492       if (!IsOnewaySignal(tile, TRACK_UPPER) || (a & SignalOnTrack(TRACK_UPPER)) == 0) b |= ~a & SignalOnTrack(TRACK_UPPER);
    02493       if (!IsOnewaySignal(tile, TRACK_LOWER) || (a & SignalOnTrack(TRACK_LOWER)) == 0) b |= ~a & SignalOnTrack(TRACK_LOWER);
    02494
    02495       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
    02496       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
    02497       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
    02498       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
    02499
    02500       break;
    02501     }
    02502
    02503     case RAIL_TILE_DEPOT: {
    02504       DiagDirection dir = GetRailDepotDirection(tile);
    02505
    02506       if (side != INVALID_DIAGDIR && side != dir) break;
    02507
    02508       trackbits = DiagDirToDiagTrackBits(dir);
    02509       break;
    02510     }
    02511   }
    02512
    02513   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
    02514 }
    02515
    02516 static bool ClickTile_Track(TileIndex tile)
    02517 {
    02518   if (!IsRailDepot(tile)) return false;
    02519
    02520   ShowDepotWindow(tile, VEH_TRAIN);
    02521   return true;
    02522 }
    02523
    02524 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
    02525 {
    02526   td->owner[0] = GetTileOwner(tile);
    02527   switch (GetRailTileType(tile)) {
    02528     case RAIL_TILE_NORMAL:
    02529       td->str = STR_LAI_RAIL_DESCRIPTION_TRACK;
    02530       break;
    02531
    02532     case RAIL_TILE_SIGNALS: {
    02533       static const StringID signal_type[6][6] = {
    02534         {
    02535           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_SIGNALS,
    02536           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
    02537           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
    02538           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02539           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
    02540           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS
    02541         },
    02542         {
    02543           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
    02544           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRESIGNALS,
    02545           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
    02546           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
    02547           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
    02548           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS
    02549         },
    02550         {
    02551           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
    02552           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
    02553           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXITSIGNALS,
    02554           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
    02555           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
    02556           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS
    02557         },
    02558         {
    02559           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02560           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
    02561           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
    02562           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBOSIGNALS,
    02563           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
    02564           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS
    02565         },
    02566         {
    02567           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
    02568           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
    02569           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
    02570           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
    02571           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBSSIGNALS,
    02572           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS
    02573         },
    02574         {
    02575           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS,
    02576           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS,
    02577           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS,
    02578           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS,
    02579           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS,
    02580           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NOENTRYSIGNALS
    02581         }
    02582       };
    02583
    02584       SignalType primary_signal;
    02585       SignalType secondary_signal;
    02586       if (HasSignalOnTrack(tile, TRACK_UPPER)) {
    02587         primary_signal = GetSignalType(tile, TRACK_UPPER);
    02588         secondary_signal = HasSignalOnTrack(tile, TRACK_LOWER) ? GetSignalType(tile, TRACK_LOWER) : primary_signal;
    02589       } else {
    02590         secondary_signal = primary_signal = GetSignalType(tile, TRACK_LOWER);
    02591       }
    02592
    02593       td->str = signal_type[secondary_signal][primary_signal];
    02594       break;
    02595     }
    02596
    02597     case RAIL_TILE_DEPOT:
    02598       td->str = STR_LAI_RAIL_DESCRIPTION_TRAIN_DEPOT;
    02599       break;
    02600
    02601     default:
    02602       NOT_REACHED();
    02603   }
    02604 }
    02605
    02606 static void ChangeTileOwner_Track(TileIndex tile, Owner old_owner, Owner new_owner)
    02607 {
    02608   if (!IsTileOwner(tile, old_owner)) return;
    02609
    02610   if (new_owner != INVALID_OWNER) {
    02611     SetTileOwner(tile, new_owner);
    02612   } else {
    02613     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
    02614   }
    02615 }
    02616
    02617 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
    02618 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
    02619 static const int8 _deltacoord_leaveoffset[8] = {
    02620   -1,  0,  1,  0, /* x */
    02621    0,  1,  0, -1  /* y */
    02622 };
    02623
    02624
    02630 int TicksToLeaveDepot(const Train *v)
    02631 {
    02632   DiagDirection dir = GetRailDepotDirection(v->tile);
    02633   int length = v->tcache.cached_veh_length;
    02634
    02635   switch (dir) {
    02636     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
    02637     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
    02638     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
    02639     default:
    02640     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
    02641   }
    02642
    02643   return 0; // make compilers happy
    02644 }
    02645
    02648 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *u, TileIndex tile, int x, int y)
    02649 {
    02650   /* this routine applies only to trains in depot tiles */
    02651   if (u->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
    02652
    02653   Train *v = Train::From(u);
    02654
    02655   /* depot direction */
    02656   DiagDirection dir = GetRailDepotDirection(tile);
    02657
    02658   /* calculate the point where the following wagon should be activated
    02659    * this depends on the length of the current vehicle */
    02660   int length = v->tcache.cached_veh_length;
    02661
    02662   byte fract_coord_leave =
    02663     ((_fractcoords_enter[dir] & 0x0F) + // x
    02664       (length + 1) * _deltacoord_leaveoffset[dir]) +
    02665     (((_fractcoords_enter[dir] >> 4) +  // y
    02666       ((length + 1) * _deltacoord_leaveoffset[dir + 4])) << 4);
    02667
    02668   byte fract_coord = (x & 0xF) + ((y & 0xF) << 4);
    02669
    02670   if (_fractcoords_behind[dir] == fract_coord) {
    02671     /* make sure a train is not entering the tile from behind */
    02672     return VETSB_CANNOT_ENTER;
    02673   } else if (_fractcoords_enter[dir] == fract_coord) {
    02674     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
    02675       /* enter the depot */
    02676       v->track = TRACK_BIT_DEPOT,
    02677       v->vehstatus |= VS_HIDDEN; // hide it
    02678       v->direction = ReverseDir(v->direction);
    02679       if (v->Next() == NULL) VehicleEnterDepot(v->First());
    02680       v->tile = tile;
    02681
    02682       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
    02683       return VETSB_ENTERED_WORMHOLE;
    02684     }
    02685   } else if (fract_coord_leave == fract_coord) {
    02686     if (DiagDirToDir(dir) == v->direction) {
    02687       /* leave the depot? */
    02688       if ((v = v->Next()) != NULL) {
    02689         v->vehstatus &= ~VS_HIDDEN;
    02690         v->track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
    02691       }
    02692     }
    02693   }
    02694
    02695   return VETSB_CONTINUE;
    02696 }
    02697
    02709 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, uint z_old, Slope tileh_old, uint z_new, Slope tileh_new, TrackBits rail_bits)
    02710 {
    02711   if (!_settings_game.construction.build_on_slopes || !AutoslopeEnabled()) return CMD_ERROR;
    02712
    02713   /* Is the slope-rail_bits combination valid in general? I.e. is it safe to call GetRailFoundation() ? */
    02714   if (CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile).Failed()) return CMD_ERROR;
    02715
    02716   /* Get the slopes on top of the foundations */
    02717   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
    02718   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
    02719
    02720   Corner track_corner;
    02721   switch (rail_bits) {
    02722     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
    02723     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
    02724     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
    02725     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
    02726
    02727     /* Surface slope must not be changed */
    02728     default: return (((z_old != z_new) || (tileh_old != tileh_new)) ? CMD_ERROR : CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]));
    02729   }
    02730
    02731   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
    02732   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
    02733   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
    02734   if (z_old != z_new) return CMD_ERROR;
    02735
    02736   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    02737   /* Make the ground dirty, if surface slope has changed */
    02738   if (tileh_old != tileh_new) {
    02739     /* If there is flat water on the lower halftile add the cost for clearing it */
    02740     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price[PR_CLEAR_WATER]);
    02741     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02742   }
    02743   return  cost;
    02744 }
    02745
    02746 static CommandCost TerraformTile_Track(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
    02747 {
    02748   uint z_old;
    02749   Slope tileh_old = GetTileSlope(tile, &z_old);
    02750   if (IsPlainRail(tile)) {
    02751     TrackBits rail_bits = GetTrackBits(tile);
    02752     /* Is there flat water on the lower halftile, that must be cleared expensively? */
    02753     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
    02754
    02755     _error_message = STR_ERROR_MUST_REMOVE_RAILROAD_TRACK;
    02756
    02757     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
    02758     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
    02759
    02760     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
    02761     Corner allowed_corner;
    02762     switch (rail_bits) {
    02763       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
    02764       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
    02765       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
    02766       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
    02767       default: return autoslope_result;
    02768     }
    02769
    02770     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
    02771
    02772     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
    02773     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
    02774
    02775     /* Everything is valid, which only changes allowed_corner */
    02776     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
    02777       if (allowed_corner == corner) continue;
    02778       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
    02779     }
    02780
    02781     /* Make the ground dirty */
    02782     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02783
    02784     /* allow terraforming */
    02785     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price[PR_CLEAR_WATER] : (Money)0);
    02786   } else if (_settings_game.construction.build_on_slopes && AutoslopeEnabled() &&
    02787       AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) {
    02788     return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    02789   }
    02790   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    02791 }
    02792
    02793
    02794 extern const TileTypeProcs _tile_type_rail_procs = {
    02795   DrawTile_Track,           // draw_tile_proc
    02796   GetSlopeZ_Track,          // get_slope_z_proc
    02797   ClearTile_Track,          // clear_tile_proc
    02798   NULL,                     // add_accepted_cargo_proc
    02799   GetTileDesc_Track,        // get_tile_desc_proc
    02800   GetTileTrackStatus_Track, // get_tile_track_status_proc
    02801   ClickTile_Track,          // click_tile_proc
    02802   NULL,                     // animate_tile_proc
    02803   TileLoop_Track,           // tile_loop_clear
    02804   ChangeTileOwner_Track,    // change_tile_owner_clear
    02805   NULL,                     // add_produced_cargo_proc
    02806   VehicleEnter_Track,       // vehicle_enter_tile_proc
    02807   GetFoundation_Track,      // get_foundation_proc
    02808   TerraformTile_Track,      // terraform_tile_proc
    02809 };