# rail_cmd.cpp

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    00001 /* $Id: rail_cmd.cpp 20261 2010-07-31 18:27:54Z 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 (GetFloodingBehaviour(tile) != FLOOD_NONE) {
    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 = Extract<RailType, 0, 4>(p1);
    00373   Track track = Extract<Track, 0, 3>(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         if (RailNoLevelCrossings(railtype)) return_cmd_error(STR_ERROR_CROSSING_DISALLOWED);
    00435
    00436         RoadTypes roadtypes = GetRoadTypes(tile);
    00437         RoadBits road = GetRoadBits(tile, ROADTYPE_ROAD);
    00438         RoadBits tram = GetRoadBits(tile, ROADTYPE_TRAM);
    00439         switch (roadtypes) {
    00440           default: break;
    00441           case ROADTYPES_TRAM:
    00442             /* Tram crossings must always have road. */
    00443             if (flags & DC_EXEC) SetRoadOwner(tile, ROADTYPE_ROAD, _current_company);
    00444             roadtypes |= ROADTYPES_ROAD;
    00445             break;
    00446
    00447           case ROADTYPES_ALL:
    00448             if (road != tram) return CMD_ERROR;
    00449             break;
    00450         }
    00451
    00452         road |= tram;
    00453
    00454         if ((track == TRACK_X && road == ROAD_Y) ||
    00455             (track == TRACK_Y && road == ROAD_X)) {
    00456           if (flags & DC_EXEC) {
    00457             MakeRoadCrossing(tile, GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), _current_company, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, roadtypes, GetTownIndex(tile));
    00458             UpdateLevelCrossing(tile, false);
    00459           }
    00460           break;
    00461         }
    00462       }
    00463
    00464       if (IsLevelCrossing(tile) && GetCrossingRailBits(tile) == trackbit) {
    00465         return_cmd_error(STR_ERROR_ALREADY_BUILT);
    00466       }
    00467       /* FALLTHROUGH */
    00468
    00469     default: {
    00470       /* Will there be flat water on the lower halftile? */
    00471       bool water_ground = IsTileType(tile, MP_WATER) && IsSlopeWithOneCornerRaised(tileh);
    00472
    00473       CommandCost ret = CheckRailSlope(tileh, trackbit, TRACK_BIT_NONE, tile);
    00474       if (ret.Failed()) return ret;
    00475       cost.AddCost(ret);
    00476
    00477       ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00478       if (ret.Failed()) return ret;
    00479       cost.AddCost(ret);
    00480
    00481       if (water_ground) {
    00482         cost.AddCost(-_price[PR_CLEAR_WATER]);
    00483         cost.AddCost(_price[PR_CLEAR_ROUGH]);
    00484       }
    00485
    00486       if (flags & DC_EXEC) {
    00487         MakeRailNormal(tile, _current_company, trackbit, railtype);
    00488         if (water_ground) SetRailGroundType(tile, RAIL_GROUND_WATER);
    00489       }
    00490       break;
    00491     }
    00492   }
    00493
    00494   if (flags & DC_EXEC) {
    00495     MarkTileDirtyByTile(tile);
    00496     AddTrackToSignalBuffer(tile, track, _current_company);
    00497     YapfNotifyTrackLayoutChange(tile, track);
    00498   }
    00499
    00500   cost.AddCost(RailBuildCost(railtype));
    00501   return cost;
    00502 }
    00503
    00512 CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00513 {
    00514   Track track = Extract<Track, 0, 3>(p2);
    00515   CommandCost cost(EXPENSES_CONSTRUCTION);
    00516   bool crossing = false;
    00517
    00518   if (!ValParamTrackOrientation(track)) return CMD_ERROR;
    00519   TrackBits trackbit = TrackToTrackBits(track);
    00520
    00521   /* Need to read tile owner now because it may change when the rail is removed
    00522    * Also, in case of floods, _current_company != owner
    00523    * There may be invalid tiletype even in exec run (when removing long track),
    00524    * so do not call GetTileOwner(tile) in any case here */
    00525   Owner owner = INVALID_OWNER;
    00526
    00527   Train *v = NULL;
    00528
    00529   switch (GetTileType(tile)) {
    00530     case MP_ROAD: {
    00531       if (!IsLevelCrossing(tile) ||
    00532           GetCrossingRailBits(tile) != trackbit ||
    00533           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
    00534           (!(flags & DC_BANKRUPT) && !EnsureNoVehicleOnGround(tile))) {
    00535         return CMD_ERROR;
    00536       }
    00537
    00538       cost.AddCost(RailClearCost(GetRailType(tile)));
    00539
    00540       if (flags & DC_EXEC) {
    00541         if (HasReservedTracks(tile, trackbit)) {
    00542           v = GetTrainForReservation(tile, track);
    00543           if (v != NULL) FreeTrainTrackReservation(v);
    00544         }
    00545         owner = GetTileOwner(tile);
    00546         MakeRoadNormal(tile, GetCrossingRoadBits(tile), GetRoadTypes(tile), GetTownIndex(tile), GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM));
    00547       }
    00548       break;
    00549     }
    00550
    00551     case MP_RAILWAY: {
    00552       TrackBits present;
    00553
    00554       if (!IsPlainRail(tile) ||
    00555           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
    00556           !EnsureNoTrainOnTrack(tile, track)) {
    00557         return CMD_ERROR;
    00558       }
    00559
    00560       present = GetTrackBits(tile);
    00561       if ((present & trackbit) == 0) return CMD_ERROR;
    00562       if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
    00563
    00564       cost.AddCost(RailClearCost(GetRailType(tile)));
    00565
    00566       /* Charge extra to remove signals on the track, if they are there */
    00567       if (HasSignalOnTrack(tile, track))
    00568         cost.AddCost(DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS));
    00569
    00570       if (flags & DC_EXEC) {
    00571         if (HasReservedTracks(tile, trackbit)) {
    00572           v = GetTrainForReservation(tile, track);
    00573           if (v != NULL) FreeTrainTrackReservation(v);
    00574         }
    00575         owner = GetTileOwner(tile);
    00576         present ^= trackbit;
    00577         if (present == 0) {
    00578           Slope tileh = GetTileSlope(tile, NULL);
    00579           /* If there is flat water on the lower halftile, convert the tile to shore so the water remains */
    00580           if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh)) {
    00581             MakeShore(tile);
    00582           } else {
    00583             DoClearSquare(tile);
    00584           }
    00585         } else {
    00586           SetTrackBits(tile, present);
    00587           SetTrackReservation(tile, GetRailReservationTrackBits(tile) & present);
    00588         }
    00589       }
    00590       break;
    00591     }
    00592
    00593     default: return CMD_ERROR;
    00594   }
    00595
    00596   if (flags & DC_EXEC) {
    00597     /* if we got that far, 'owner' variable is set correctly */
    00598     assert(Company::IsValidID(owner));
    00599
    00600     MarkTileDirtyByTile(tile);
    00601     if (crossing) {
    00602       /* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we
    00603        * are removing one of these pieces, we'll need to update signals for
    00604        * both directions explicitly, as after the track is removed it won't
    00605        * 'connect' with the other piece. */
    00606       AddTrackToSignalBuffer(tile, TRACK_X, owner);
    00607       AddTrackToSignalBuffer(tile, TRACK_Y, owner);
    00608       YapfNotifyTrackLayoutChange(tile, TRACK_X);
    00609       YapfNotifyTrackLayoutChange(tile, TRACK_Y);
    00610     } else {
    00611       AddTrackToSignalBuffer(tile, track, owner);
    00612       YapfNotifyTrackLayoutChange(tile, track);
    00613     }
    00614
    00615     if (v != NULL) TryPathReserve(v, true);
    00616   }
    00617
    00618   return cost;
    00619 }
    00620
    00621
    00629 bool FloodHalftile(TileIndex t)
    00630 {
    00631   assert(IsPlainRailTile(t));
    00632
    00633   bool flooded = false;
    00634   if (GetRailGroundType(t) == RAIL_GROUND_WATER) return flooded;
    00635
    00636   Slope tileh = GetTileSlope(t, NULL);
    00637   TrackBits rail_bits = GetTrackBits(t);
    00638
    00639   if (IsSlopeWithOneCornerRaised(tileh)) {
    00640     TrackBits lower_track = CornerToTrackBits(OppositeCorner(GetHighestSlopeCorner(tileh)));
    00641
    00642     TrackBits to_remove = lower_track & rail_bits;
    00643     if (to_remove != 0) {
    00644       _current_company = OWNER_WATER;
    00645       if (DoCommand(t, 0, FIND_FIRST_BIT(to_remove), DC_EXEC, CMD_REMOVE_SINGLE_RAIL).Failed()) return flooded; // not yet floodable
    00646       flooded = true;
    00647       rail_bits = rail_bits & ~to_remove;
    00648       if (rail_bits == 0) {
    00649         MakeShore(t);
    00650         MarkTileDirtyByTile(t);
    00651         return flooded;
    00652       }
    00653     }
    00654
    00655     if (IsNonContinuousFoundation(GetRailFoundation(tileh, rail_bits))) {
    00656       flooded = true;
    00657       SetRailGroundType(t, RAIL_GROUND_WATER);
    00658       MarkTileDirtyByTile(t);
    00659     }
    00660   } else {
    00661     /* Make shore on steep slopes and 'three-corners-raised'-slopes. */
    00662     if (ApplyFoundationToSlope(GetRailFoundation(tileh, rail_bits), &tileh) == 0) {
    00663       if (IsSteepSlope(tileh) || IsSlopeWithThreeCornersRaised(tileh)) {
    00664         flooded = true;
    00665         SetRailGroundType(t, RAIL_GROUND_WATER);
    00666         MarkTileDirtyByTile(t);
    00667       }
    00668     }
    00669   }
    00670   return flooded;
    00671 }
    00672
    00673 static const TileIndexDiffC _trackdelta[] = {
    00674   { -1,  0 }, {  0,  1 }, { -1,  0 }, {  0,  1 }, {  1,  0 }, {  0,  1 },
    00675   {  0,  0 },
    00676   {  0,  0 },
    00677   {  1,  0 }, {  0, -1 }, {  0, -1 }, {  1,  0 }, {  0, -1 }, { -1,  0 },
    00678   {  0,  0 },
    00679   {  0,  0 }
    00680 };
    00681
    00682
    00683 static CommandCost ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)
    00684 {
    00685   int x = TileX(start);
    00686   int y = TileY(start);
    00687   int ex = TileX(end);
    00688   int ey = TileY(end);
    00689
    00690   if (!ValParamTrackOrientation(TrackdirToTrack(*trackdir))) return CMD_ERROR;
    00691
    00692   /* calculate delta x,y from start to end tile */
    00693   int dx = ex - x;
    00694   int dy = ey - y;
    00695
    00696   /* calculate delta x,y for the first direction */
    00697   int trdx = _trackdelta[*trackdir].x;
    00698   int trdy = _trackdelta[*trackdir].y;
    00699
    00700   if (!IsDiagonalTrackdir(*trackdir)) {
    00701     trdx += _trackdelta[*trackdir ^ 1].x;
    00702     trdy += _trackdelta[*trackdir ^ 1].y;
    00703   }
    00704
    00705   /* validate the direction */
    00706   while (
    00707     (trdx <= 0 && dx > 0) ||
    00708     (trdx >= 0 && dx < 0) ||
    00709     (trdy <= 0 && dy > 0) ||
    00710     (trdy >= 0 && dy < 0)
    00711   ) {
    00712     if (!HasBit(*trackdir, 3)) { // first direction is invalid, try the other
    00713       SetBit(*trackdir, 3); // reverse the direction
    00714       trdx = -trdx;
    00715       trdy = -trdy;
    00716     } else { // other direction is invalid too, invalid drag
    00717       return CMD_ERROR;
    00718     }
    00719   }
    00720
    00721   /* (for diagonal tracks, this is already made sure of by above test), but:
    00722    * for non-diagonal tracks, check if the start and end tile are on 1 line */
    00723   if (!IsDiagonalTrackdir(*trackdir)) {
    00724     trdx = _trackdelta[*trackdir].x;
    00725     trdy = _trackdelta[*trackdir].y;
    00726     if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx))
    00727       return CMD_ERROR;
    00728   }
    00729
    00730   return CommandCost();
    00731 }
    00732
    00745 static CommandCost CmdRailTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00746 {
    00747   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
    00748   Track track = Extract<Track, 4, 3>(p2);
    00749   bool remove = HasBit(p2, 7);
    00750   RailType railtype = Extract<RailType, 0, 4>(p2);
    00751
    00752   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
    00753   if (p1 >= MapSize()) return CMD_ERROR;
    00754   TileIndex end_tile = p1;
    00755   Trackdir trackdir = TrackToTrackdir(track);
    00756
    00757   if (ValidateAutoDrag(&trackdir, tile, end_tile).Failed()) return CMD_ERROR;
    00758
    00759   if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, tile);
    00760
    00761   for (;;) {
    00762     ret = DoCommand(tile, railtype, TrackdirToTrack(trackdir), flags, remove ? CMD_REMOVE_SINGLE_RAIL : CMD_BUILD_SINGLE_RAIL);
    00763
    00764     if (ret.Failed()) {
    00765       if (_error_message != STR_ERROR_ALREADY_BUILT && !remove) {
    00766         if (HasBit(p2, 8)) return CMD_ERROR;
    00767         break;
    00768       }
    00769       _error_message = INVALID_STRING_ID;
    00770     } else {
    00771       total_cost.AddCost(ret);
    00772     }
    00773
    00774     if (tile == end_tile) break;
    00775
    00776     tile += ToTileIndexDiff(_trackdelta[trackdir]);
    00777
    00778     /* toggle railbit for the non-diagonal tracks */
    00779     if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
    00780   }
    00781
    00782   return (total_cost.GetCost() == 0) ? CommandCost(remove ? INVALID_STRING_ID : (_error_message == INVALID_STRING_ID ? STR_ERROR_ALREADY_BUILT : _error_message)) : total_cost;
    00783 }
    00784
    00798 CommandCost CmdBuildRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00799 {
    00800   return CmdRailTrackHelper(tile, flags, p1, ClrBit(p2, 7), text);
    00801 }
    00802
    00816 CommandCost CmdRemoveRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00817 {
    00818   return CmdRailTrackHelper(tile, flags, p1, SetBit(p2, 7), text);
    00819 }
    00820
    00832 CommandCost CmdBuildTrainDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00833 {
    00834   /* check railtype and valid direction for depot (0 through 3), 4 in total */
    00835   RailType railtype = Extract<RailType, 0, 4>(p1);
    00836   if (!ValParamRailtype(railtype)) return CMD_ERROR;
    00837
    00838   Slope tileh = GetTileSlope(tile, NULL);
    00839
    00840   DiagDirection dir = Extract<DiagDirection, 0, 2>(p2);
    00841
    00842   /* Prohibit construction if
    00843    * The tile is non-flat AND
    00844    * 1) build-on-slopes is disabled
    00845    * 2) the tile is steep i.e. spans two height levels
    00846    * 3) the exit points in the wrong direction
    00847    */
    00848
    00849   if (tileh != SLOPE_FLAT && (
    00850         !_settings_game.construction.build_on_slopes ||
    00851         IsSteepSlope(tileh) ||
    00852         !CanBuildDepotByTileh(dir, tileh)
    00853       )) {
    00854     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
    00855   }
    00856
    00857   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00858   if (cost.Failed()) return CMD_ERROR;
    00859
    00860   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
    00861
    00862   if (!Depot::CanAllocateItem()) return CMD_ERROR;
    00863
    00864   if (flags & DC_EXEC) {
    00865     Depot *d = new Depot(tile);
    00866     d->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
    00867
    00868     MakeRailDepot(tile, _current_company, d->index, dir, railtype);
    00869     MarkTileDirtyByTile(tile);
    00870
    00871     AddSideToSignalBuffer(tile, INVALID_DIAGDIR, _current_company);
    00872     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
    00873   }
    00874
    00875   cost.AddCost(_price[PR_BUILD_DEPOT_TRAIN]);
    00876   cost.AddCost(RailBuildCost(railtype));
    00877   return cost;
    00878 }
    00879
    00900 CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00901 {
    00902   Track track = Extract<Track, 0, 3>(p1);
    00903   bool ctrl_pressed = HasBit(p1, 3); // was the CTRL button pressed
    00904   SignalVariant sigvar = (ctrl_pressed ^ HasBit(p1, 4)) ? SIG_SEMAPHORE : SIG_ELECTRIC; // the signal variant of the new signal
    00905   SignalType sigtype = Extract<SignalType, 5, 3>(p1); // the signal type of the new signal
    00906   bool convert_signal = HasBit(p1, 8); // convert button pressed
    00907   SignalType cycle_start = Extract<SignalType, 9, 3>(p1);
    00908   SignalType cycle_stop = Extract<SignalType, 12, 3>(p1);
    00909   uint num_dir_cycle = GB(p1, 15, 2);
    00910
    00911   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
    00912   if (cycle_start > cycle_stop || cycle_stop > SIGTYPE_LAST) return CMD_ERROR;
    00913
    00914   /* You can only build signals on plain rail tiles, and the selected track must exist */
    00915   if (!ValParamTrackOrientation(track) || !IsPlainRailTile(tile) ||
    00916       !HasTrack(tile, track) || !EnsureNoTrainOnTrack(tile, track)) {
    00917     return CMD_ERROR;
    00918   }
    00919
    00920   /* Protect against invalid signal copying */
    00921   if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
    00922
    00923   if (!CheckTileOwnership(tile)) return CMD_ERROR;
    00924
    00925   {
    00926     /* See if this is a valid track combination for signals, (ie, no overlap) */
    00927     TrackBits trackbits = GetTrackBits(tile);
    00928     if (KillFirstBit(trackbits) != TRACK_BIT_NONE && // More than one track present
    00929         trackbits != TRACK_BIT_HORZ &&
    00930         trackbits != TRACK_BIT_VERT) {
    00931       return_cmd_error(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK);
    00932     }
    00933   }
    00934
    00935   /* In case we don't want to change an existing signal, return without error. */
    00936   if (HasBit(p1, 17) && HasSignalOnTrack(tile, track)) return CommandCost();
    00937
    00938   /* you can not convert a signal if no signal is on track */
    00939   if (convert_signal && !HasSignalOnTrack(tile, track)) return CMD_ERROR;
    00940
    00941   CommandCost cost;
    00942   if (!HasSignalOnTrack(tile, track)) {
    00943     /* build new signals */
    00944     cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS]);
    00945   } else {
    00946     if (p2 != 0 && sigvar != GetSignalVariant(tile, track)) {
    00947       /* convert signals <-> semaphores */
    00948       cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
    00949
    00950     } else if (convert_signal) {
    00951       /* convert button pressed */
    00952       if (ctrl_pressed || GetSignalVariant(tile, track) != sigvar) {
    00953         /* convert electric <-> semaphore */
    00954         cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
    00955       } else {
    00956         /* it is free to change signal type: normal-pre-exit-combo */
    00957         cost = CommandCost();
    00958       }
    00959
    00960     } else {
    00961       /* it is free to change orientation/pre-exit-combo signals */
    00962       cost = CommandCost();
    00963     }
    00964   }
    00965
    00966   if (flags & DC_EXEC) {
    00967     Train *v = NULL;
    00968     /* The new/changed signal could block our path. As this can lead to
    00969      * stale reservations, we clear the path reservation here and try
    00970      * to redo it later on. */
    00971     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
    00972       v = GetTrainForReservation(tile, track);
    00973       if (v != NULL) FreeTrainTrackReservation(v);
    00974     }
    00975
    00976     if (!HasSignals(tile)) {
    00977       /* there are no signals at all on this tile yet */
    00978       SetHasSignals(tile, true);
    00979       SetSignalStates(tile, 0xF); // all signals are on
    00980       SetPresentSignals(tile, 0); // no signals built by default
    00981       SetSignalType(tile, track, sigtype);
    00982       SetSignalVariant(tile, track, sigvar);
    00983     }
    00984
    00985     if (p2 == 0) {
    00986       if (!HasSignalOnTrack(tile, track)) {
    00987         /* build new signals */
    00988         SetPresentSignals(tile, GetPresentSignals(tile) | (IsPbsSignal(sigtype) ? KillFirstBit(SignalOnTrack(track)) : SignalOnTrack(track)));
    00989         SetSignalType(tile, track, sigtype);
    00990         SetSignalVariant(tile, track, sigvar);
    00991         while (num_dir_cycle-- > 0) CycleSignalSide(tile, track);
    00992       } else {
    00993         if (convert_signal) {
    00994           /* convert signal button pressed */
    00995           if (ctrl_pressed) {
    00996             /* toggle the pressent signal variant: SIG_ELECTRIC <-> SIG_SEMAPHORE */
    00997             SetSignalVariant(tile, track, (GetSignalVariant(tile, track) == SIG_ELECTRIC) ? SIG_SEMAPHORE : SIG_ELECTRIC);
    00998             /* Query current signal type so the check for PBS signals below works. */
    00999             sigtype = GetSignalType(tile, track);
    01000           } else {
    01001             /* convert the present signal to the chosen type and variant */
    01002             SetSignalType(tile, track, sigtype);
    01003             SetSignalVariant(tile, track, sigvar);
    01004             if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
    01005               SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
    01006             }
    01007           }
    01008
    01009         } else if (ctrl_pressed) {
    01010           /* cycle between cycle_start and cycle_end */
    01011           sigtype = (SignalType)(GetSignalType(tile, track) + 1);
    01012
    01013           if (sigtype < cycle_start || sigtype > cycle_stop) sigtype = cycle_start;
    01014
    01015           SetSignalType(tile, track, sigtype);
    01016           if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
    01017             SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
    01018           }
    01019         } else {
    01020           /* cycle the signal side: both -> left -> right -> both -> ... */
    01021           CycleSignalSide(tile, track);
    01022           /* Query current signal type so the check for PBS signals below works. */
    01023           sigtype = GetSignalType(tile, track);
    01024         }
    01025       }
    01026     } else {
    01027       /* If CmdBuildManySignals is called with copying signals, just copy the
    01028        * direction of the first signal given as parameter by CmdBuildManySignals */
    01029       SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | (p2 & SignalOnTrack(track)));
    01030       SetSignalVariant(tile, track, sigvar);
    01031       SetSignalType(tile, track, sigtype);
    01032     }
    01033
    01034     if (IsPbsSignal(sigtype)) {
    01035       /* PBS signals should show red unless they are on a reservation. */
    01036       uint mask = GetPresentSignals(tile) & SignalOnTrack(track);
    01037       SetSignalStates(tile, (GetSignalStates(tile) & ~mask) | ((HasBit(GetRailReservationTrackBits(tile), track) ? UINT_MAX : 0) & mask));
    01038     }
    01039     MarkTileDirtyByTile(tile);
    01040     AddTrackToSignalBuffer(tile, track, _current_company);
    01041     YapfNotifyTrackLayoutChange(tile, track);
    01042     if (v != NULL) {
    01043       /* Extend the train's path if it's not stopped or loading, or not at a safe position. */
    01044       if (!(((v->vehstatus & VS_STOPPED) && v->cur_speed == 0) || v->current_order.IsType(OT_LOADING)) ||
    01045           !IsSafeWaitingPosition(v, v->tile, v->GetVehicleTrackdir(), true, _settings_game.pf.forbid_90_deg)) {
    01046         TryPathReserve(v, true);
    01047       }
    01048     }
    01049   }
    01050
    01051   return cost;
    01052 }
    01053
    01054 static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
    01055 {
    01056   tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
    01057   if (tile == INVALID_TILE) return false;
    01058
    01059   /* Check for track bits on the new tile */
    01060   TrackdirBits trackdirbits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
    01061
    01062   if (TracksOverlap(TrackdirBitsToTrackBits(trackdirbits))) return false;
    01063   trackdirbits &= TrackdirReachesTrackdirs(trackdir);
    01064
    01065   /* No track bits, must stop */
    01066   if (trackdirbits == TRACKDIR_BIT_NONE) return false;
    01067
    01068   /* Get the first track dir */
    01069   trackdir = RemoveFirstTrackdir(&trackdirbits);
    01070
    01071   /* Any left? It's a junction so we stop */
    01072   if (trackdirbits != TRACKDIR_BIT_NONE) return false;
    01073
    01074   switch (GetTileType(tile)) {
    01075     case MP_RAILWAY:
    01076       if (IsRailDepot(tile)) return false;
    01077       if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
    01078       signal_ctr++;
    01079       if (IsDiagonalTrackdir(trackdir)) {
    01080         signal_ctr++;
    01081         /* Ensure signal_ctr even so X and Y pieces get signals */
    01082         ClrBit(signal_ctr, 0);
    01083       }
    01084       return true;
    01085
    01086     case MP_ROAD:
    01087       if (!IsLevelCrossing(tile)) return false;
    01088       signal_ctr += 2;
    01089       return true;
    01090
    01091     case MP_TUNNELBRIDGE: {
    01092       TileIndex orig_tile = tile; // backup old value
    01093
    01094       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
    01095       if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
    01096
    01097       /* Skip to end of tunnel or bridge
    01098        * note that tile is a parameter by reference, so it must be updated */
    01099       tile = GetOtherTunnelBridgeEnd(tile);
    01100
    01101       signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
    01102       return true;
    01103     }
    01104
    01105     default: return false;
    01106   }
    01107 }
    01108
    01124 static CommandCost CmdSignalTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01125 {
    01126   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
    01127   bool err = true;
    01128   TileIndex start_tile = tile;
    01129
    01130   Track track = Extract<Track, 0, 3>(p2);
    01131   bool mode = HasBit(p2, 3);
    01132   bool semaphores = HasBit(p2, 4);
    01133   bool remove = HasBit(p2, 5);
    01134   bool autofill = HasBit(p2, 6);
    01135   byte signal_density = GB(p2, 24, 8);
    01136
    01137   if (p1 >= MapSize() || !ValParamTrackOrientation(track)) return CMD_ERROR;
    01138   TileIndex end_tile = p1;
    01139   if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
    01140
    01141   if (!IsPlainRailTile(tile)) return CMD_ERROR;
    01142
    01143   /* for vertical/horizontal tracks, double the given signals density
    01144    * since the original amount will be too dense (shorter tracks) */
    01145   signal_density *= 2;
    01146
    01147   Trackdir trackdir = TrackToTrackdir(track);
    01148   if (ValidateAutoDrag(&trackdir, tile, end_tile).Failed()) return CMD_ERROR;
    01149
    01150   track = TrackdirToTrack(trackdir); // trackdir might have changed, keep track in sync
    01151   Trackdir start_trackdir = trackdir;
    01152
    01153   /* Must start on a valid track to be able to avoid loops */
    01154   if (!HasTrack(tile, track)) return CMD_ERROR;
    01155
    01156   SignalType sigtype = (SignalType)GB(p2, 7, 3);
    01157   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
    01158
    01159   byte signals;
    01160   /* copy the signal-style of the first rail-piece if existing */
    01161   if (HasSignalOnTrack(tile, track)) {
    01162     signals = GetPresentSignals(tile) & SignalOnTrack(track);
    01163     assert(signals != 0);
    01164
    01165     /* copy signal/semaphores style (independent of CTRL) */
    01166     semaphores = GetSignalVariant(tile, track) != SIG_ELECTRIC;
    01167
    01168     sigtype = GetSignalType(tile, track);
    01169     /* Don't but copy pre-signal type */
    01170     if (sigtype < SIGTYPE_PBS) sigtype = SIGTYPE_NORMAL;
    01171   } else { // no signals exist, drag a two-way signal stretch
    01172     signals = IsPbsSignal(sigtype) ? SignalAlongTrackdir(trackdir) : SignalOnTrack(track);
    01173   }
    01174
    01175   byte signal_dir = 0;
    01176   if (signals & SignalAlongTrackdir(trackdir))   SetBit(signal_dir, 0);
    01177   if (signals & SignalAgainstTrackdir(trackdir)) SetBit(signal_dir, 1);
    01178
    01179   /* signal_ctr         - amount of tiles already processed
    01180    * signals_density    - setting to put signal on every Nth tile (double space on |, -- tracks)
    01181    **********
    01182    * trackdir   - trackdir to build with autorail
    01183    * semaphores - semaphores or signals
    01184    * signals    - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
    01185    *              and convert all others to semaphore/signal
    01186    * remove     - 1 remove signals, 0 build signals */
    01187   int signal_ctr = 0;
    01188   for (;;) {
    01189     /* only build/remove signals with the specified density */
    01190     if ((remove && autofill) || signal_ctr % signal_density == 0) {
    01191       uint32 p1 = GB(TrackdirToTrack(trackdir), 0, 3);
    01192       SB(p1, 3, 1, mode);
    01193       SB(p1, 4, 1, semaphores);
    01194       SB(p1, 5, 3, sigtype);
    01195       if (!remove && signal_ctr == 0) SetBit(p1, 17);
    01196
    01197       /* Pick the correct orientation for the track direction */
    01198       signals = 0;
    01199       if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
    01200       if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
    01201
    01202       ret = DoCommand(tile, p1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
    01203
    01204       /* Be user-friendly and try placing signals as much as possible */
    01205       if (ret.Succeeded()) {
    01206         err = false;
    01207         total_cost.AddCost(ret);
    01208       }
    01209     }
    01210
    01211     if (autofill) {
    01212       if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
    01213
    01214       /* Prevent possible loops */
    01215       if (tile == start_tile && trackdir == start_trackdir) break;
    01216     } else {
    01217       if (tile == end_tile) break;
    01218
    01219       tile += ToTileIndexDiff(_trackdelta[trackdir]);
    01220       signal_ctr++;
    01221
    01222       /* toggle railbit for the non-diagonal tracks (|, -- tracks) */
    01223       if (IsDiagonalTrackdir(trackdir)) {
    01224         signal_ctr++;
    01225       } else {
    01226         ToggleBit(trackdir, 0);
    01227       }
    01228     }
    01229   }
    01230
    01231   return err ? CMD_ERROR : total_cost;
    01232 }
    01233
    01251 CommandCost CmdBuildSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01252 {
    01253   return CmdSignalTrackHelper(tile, flags, p1, p2, text);
    01254 }
    01255
    01267 CommandCost CmdRemoveSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01268 {
    01269   Track track = Extract<Track, 0, 3>(p1);
    01270
    01271   if (!ValParamTrackOrientation(track) ||
    01272       !IsPlainRailTile(tile) ||
    01273       !HasTrack(tile, track) ||
    01274       !EnsureNoTrainOnTrack(tile, track) ||
    01275       !HasSignalOnTrack(tile, track)) {
    01276     return CMD_ERROR;
    01277   }
    01278
    01279   /* Only water can remove signals from anyone */
    01280   if (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) return CMD_ERROR;
    01281
    01282   /* Do it? */
    01283   if (flags & DC_EXEC) {
    01284     Train *v = NULL;
    01285     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
    01286       v = GetTrainForReservation(tile, track);
    01287     } else if (IsPbsSignal(GetSignalType(tile, track))) {
    01288       /* PBS signal, might be the end of a path reservation. */
    01289       Trackdir td = TrackToTrackdir(track);
    01290       for (int i = 0; v == NULL && i < 2; i++, td = ReverseTrackdir(td)) {
    01291         /* Only test the active signal side. */
    01292         if (!HasSignalOnTrackdir(tile, ReverseTrackdir(td))) continue;
    01293         TileIndex next = TileAddByDiagDir(tile, TrackdirToExitdir(td));
    01294         TrackBits tracks = TrackdirBitsToTrackBits(TrackdirReachesTrackdirs(td));
    01295         if (HasReservedTracks(next, tracks)) {
    01296           v = GetTrainForReservation(next, TrackBitsToTrack(GetReservedTrackbits(next) & tracks));
    01297         }
    01298       }
    01299     }
    01300     SetPresentSignals(tile, GetPresentSignals(tile) & ~SignalOnTrack(track));
    01301
    01302     /* removed last signal from tile? */
    01303     if (GetPresentSignals(tile) == 0) {
    01304       SetSignalStates(tile, 0);
    01305       SetHasSignals(tile, false);
    01306       SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
    01307     }
    01308
    01309     AddTrackToSignalBuffer(tile, track, GetTileOwner(tile));
    01310     YapfNotifyTrackLayoutChange(tile, track);
    01311     if (v != NULL) TryPathReserve(v, false);
    01312
    01313     MarkTileDirtyByTile(tile);
    01314   }
    01315
    01316   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_SIGNALS]);
    01317 }
    01318
    01336 CommandCost CmdRemoveSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01337 {
    01338   return CmdSignalTrackHelper(tile, flags, p1, SetBit(p2, 5), text); // bit 5 is remove bit
    01339 }
    01340
    01342 static Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
    01343 {
    01344   if (v->type != VEH_TRAIN) return NULL;
    01345
    01346   /* Similar checks as in Train::PowerChanged() */
    01347
    01348   Train *t = Train::From(v);
    01349   if (t->IsArticulatedPart()) return NULL;
    01350
    01351   const RailVehicleInfo *rvi = RailVehInfo(t->engine_type);
    01352   if (GetVehicleProperty(t, PROP_TRAIN_POWER, rvi->power) != 0) t->First()->PowerChanged();
    01353
    01354   return NULL;
    01355 }
    01356
    01366 CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01367 {
    01368   CommandCost cost(EXPENSES_CONSTRUCTION);
    01369   RailType totype = Extract<RailType, 0, 4>(p2);
    01370
    01371   if (!ValParamRailtype(totype)) return CMD_ERROR;
    01372   if (p1 >= MapSize()) return CMD_ERROR;
    01373
    01374   uint ex = TileX(tile);
    01375   uint ey = TileY(tile);
    01376   uint sx = TileX(p1);
    01377   uint sy = TileY(p1);
    01378
    01379   /* make sure sx,sy are smaller than ex,ey */
    01380   if (ex < sx) Swap(ex, sx);
    01381   if (ey < sy) Swap(ey, sy);
    01382
    01383   _error_message = STR_ERROR_NO_SUITABLE_RAILROAD_TRACK; // by default, there is no track to convert
    01384
    01385   for (uint x = sx; x <= ex; ++x) {
    01386     for (uint y = sy; y <= ey; ++y) {
    01387       TileIndex tile = TileXY(x, y);
    01388       TileType tt = GetTileType(tile);
    01389
    01390       /* Check if there is any track on tile */
    01391       switch (tt) {
    01392         case MP_RAILWAY:
    01393           break;
    01394         case MP_STATION:
    01395           if (!HasStationRail(tile)) continue;
    01396           break;
    01397         case MP_ROAD:
    01398           if (!IsLevelCrossing(tile)) continue;
    01399           if (RailNoLevelCrossings(totype)) {
    01400             _error_message = STR_ERROR_CROSSING_DISALLOWED;
    01401             continue;
    01402           }
    01403           break;
    01404         case MP_TUNNELBRIDGE:
    01405           if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
    01406           break;
    01407         default: continue;
    01408       }
    01409
    01410       /* Original railtype we are converting from */
    01411       RailType type = GetRailType(tile);
    01412
    01413       /* Converting to the same type or converting 'hidden' elrail -> rail */
    01414       if (type == totype || (_settings_game.vehicle.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
    01415
    01416       /* Trying to convert other's rail */
    01417       if (!CheckTileOwnership(tile)) continue;
    01418
    01419       SmallVector<Train *, 2> vehicles_affected;
    01420
    01421       /* Vehicle on the tile when not converting Rail <-> ElRail
    01422        * Tunnels and bridges have special check later */
    01423       if (tt != MP_TUNNELBRIDGE) {
    01424         if (!IsCompatibleRail(type, totype) && !EnsureNoVehicleOnGround(tile)) continue;
    01425         if (flags & DC_EXEC) { // we can safely convert, too
    01426           TrackBits reserved = GetReservedTrackbits(tile);
    01427           Track     track;
    01428           while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
    01429             Train *v = GetTrainForReservation(tile, track);
    01430             if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
    01431               /* No power on new rail type, reroute. */
    01432               FreeTrainTrackReservation(v);
    01433               *vehicles_affected.Append() = v;
    01434             }
    01435           }
    01436
    01437           SetRailType(tile, totype);
    01438           MarkTileDirtyByTile(tile);
    01439           /* update power of train engines on this tile */
    01440           FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
    01441         }
    01442       }
    01443
    01444       switch (tt) {
    01445         case MP_RAILWAY:
    01446           switch (GetRailTileType(tile)) {
    01447             case RAIL_TILE_DEPOT:
    01448               if (flags & DC_EXEC) {
    01449                 /* notify YAPF about the track layout change */
    01450                 YapfNotifyTrackLayoutChange(tile, GetRailDepotTrack(tile));
    01451
    01452                 /* Update build vehicle window related to this depot */
    01453                 InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
    01454                 InvalidateWindowData(WC_BUILD_VEHICLE, tile);
    01455               }
    01456               cost.AddCost(RailConvertCost(type, totype));
    01457               break;
    01458
    01459             default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
    01460               if (flags & DC_EXEC) {
    01461                 /* notify YAPF about the track layout change */
    01462                 TrackBits tracks = GetTrackBits(tile);
    01463                 while (tracks != TRACK_BIT_NONE) {
    01464                   YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
    01465                 }
    01466               }
    01467               cost.AddCost(RailConvertCost(type, totype) * CountBits(GetTrackBits(tile)));
    01468               break;
    01469           }
    01470           break;
    01471
    01472         case MP_TUNNELBRIDGE: {
    01473           TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
    01474
    01475           /* If both ends of tunnel/bridge are in the range, do not try to convert twice -
    01476            * it would cause assert because of different test and exec runs */
    01477           if (endtile < tile && TileX(endtile) >= sx && TileX(endtile) <= ex &&
    01478               TileY(endtile) >= sy && TileY(endtile) <= ey) continue;
    01479
    01480           /* When not coverting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
    01481           if (!IsCompatibleRail(GetRailType(tile), totype) &&
    01482               HasVehicleOnTunnelBridge(tile, endtile)) continue;
    01483
    01484           if (flags & DC_EXEC) {
    01485             Track track = DiagDirToDiagTrack(GetTunnelBridgeDirection(tile));
    01486             if (HasTunnelBridgeReservation(tile)) {
    01487               Train *v = GetTrainForReservation(tile, track);
    01488               if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
    01489                 /* No power on new rail type, reroute. */
    01490                 FreeTrainTrackReservation(v);
    01491                 *vehicles_affected.Append() = v;
    01492               }
    01493             }
    01494             SetRailType(tile, totype);
    01495             SetRailType(endtile, totype);
    01496
    01497             FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
    01498             FindVehicleOnPos(endtile, NULL, &UpdateTrainPowerProc);
    01499
    01500             YapfNotifyTrackLayoutChange(tile, track);
    01501             YapfNotifyTrackLayoutChange(endtile, track);
    01502
    01503             MarkTileDirtyByTile(tile);
    01504             MarkTileDirtyByTile(endtile);
    01505
    01506             if (IsBridge(tile)) {
    01507               TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
    01508               TileIndex t = tile + delta;
    01509               for (; t != endtile; t += delta) MarkTileDirtyByTile(t); // TODO encapsulate this into a function
    01510             }
    01511           }
    01512
    01513           cost.AddCost((GetTunnelBridgeLength(tile, endtile) + 2) * RailConvertCost(type, totype));
    01514         } break;
    01515
    01516         default: // MP_STATION, MP_ROAD
    01517           if (flags & DC_EXEC) {
    01518             Track track = ((tt == MP_STATION) ? GetRailStationTrack(tile) : GetCrossingRailTrack(tile));
    01519             YapfNotifyTrackLayoutChange(tile, track);
    01520           }
    01521
    01522           cost.AddCost(RailConvertCost(type, totype));
    01523           break;
    01524       }
    01525
    01526       for (uint i = 0; i < vehicles_affected.Length(); ++i) {
    01527         TryPathReserve(vehicles_affected[i], true);
    01528       }
    01529     }
    01530   }
    01531
    01532   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
    01533 }
    01534
    01535 static CommandCost RemoveTrainDepot(TileIndex tile, DoCommandFlag flags)
    01536 {
    01537   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER)
    01538     return CMD_ERROR;
    01539
    01540   if (!EnsureNoVehicleOnGround(tile))
    01541     return CMD_ERROR;
    01542
    01543   if (flags & DC_EXEC) {
    01544     /* read variables before the depot is removed */
    01545     DiagDirection dir = GetRailDepotDirection(tile);
    01546     Owner owner = GetTileOwner(tile);
    01547     Train *v = NULL;
    01548
    01549     if (HasDepotReservation(tile)) {
    01550       v = GetTrainForReservation(tile, DiagDirToDiagTrack(dir));
    01551       if (v != NULL) FreeTrainTrackReservation(v);
    01552     }
    01553
    01554     delete Depot::GetByTile(tile);
    01555     DoClearSquare(tile);
    01556     AddSideToSignalBuffer(tile, dir, owner);
    01557     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
    01558     if (v != NULL) TryPathReserve(v, true);
    01559   }
    01560
    01561   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_TRAIN]);
    01562 }
    01563
    01564 static CommandCost ClearTile_Track(TileIndex tile, DoCommandFlag flags)
    01565 {
    01566   CommandCost cost(EXPENSES_CONSTRUCTION);
    01567
    01568   if (flags & DC_AUTO) {
    01569     if (!IsTileOwner(tile, _current_company)) {
    01570       return_cmd_error(STR_ERROR_AREA_IS_OWNED_BY_ANOTHER);
    01571     }
    01572
    01573     if (IsPlainRail(tile)) {
    01574       return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
    01575     } else {
    01576       return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
    01577     }
    01578   }
    01579
    01580   switch (GetRailTileType(tile)) {
    01581     case RAIL_TILE_SIGNALS:
    01582     case RAIL_TILE_NORMAL: {
    01583       Slope tileh = GetTileSlope(tile, NULL);
    01584       /* Is there flat water on the lower halftile, that gets cleared expensively? */
    01585       bool water_ground = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh));
    01586
    01587       TrackBits tracks = GetTrackBits(tile);
    01588       while (tracks != TRACK_BIT_NONE) {
    01589         Track track = RemoveFirstTrack(&tracks);
    01590         CommandCost ret = DoCommand(tile, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
    01591         if (ret.Failed()) return CMD_ERROR;
    01592         cost.AddCost(ret);
    01593       }
    01594
    01595       /* when bankrupting, don't make water dirty, there could be a ship on lower halftile */
    01596       if (water_ground && !(flags & DC_BANKRUPT)) {
    01597         if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    01598
    01599         /* The track was removed, and left a coast tile. Now also clear the water. */
    01600         if (flags & DC_EXEC) DoClearSquare(tile);
    01601         cost.AddCost(_price[PR_CLEAR_WATER]);
    01602       }
    01603
    01604       return cost;
    01605     }
    01606
    01607     case RAIL_TILE_DEPOT:
    01608       return RemoveTrainDepot(tile, flags);
    01609
    01610     default:
    01611       return CMD_ERROR;
    01612   }
    01613 }
    01614
    01619 static uint GetSaveSlopeZ(uint x, uint y, Track track)
    01620 {
    01621   switch (track) {
    01622     case TRACK_UPPER: x &= ~0xF; y &= ~0xF; break;
    01623     case TRACK_LOWER: x |=  0xF; y |=  0xF; break;
    01624     case TRACK_LEFT:  x |=  0xF; y &= ~0xF; break;
    01625     case TRACK_RIGHT: x &= ~0xF; y |=  0xF; break;
    01626     default: break;
    01627   }
    01628   return GetSlopeZ(x, y);
    01629 }
    01630
    01631 static void DrawSingleSignal(TileIndex tile, Track track, byte condition, uint image, uint pos)
    01632 {
    01633   bool side = (_settings_game.vehicle.road_side != 0) && _settings_game.construction.signal_side;
    01634   static const Point SignalPositions[2][12] = {
    01635     { // Signals on the left side
    01636     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01637       { 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
    01638     /*  LOWER     LOWER     X         X         Y         Y     */
    01639       {11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
    01640     }, { // Signals on the right side
    01641     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01642       {14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
    01643     /*  LOWER     LOWER     X         X         Y         Y     */
    01644       {14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
    01645     }
    01646   };
    01647
    01648   uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
    01649   uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
    01650
    01651   SpriteID sprite;
    01652
    01653   SignalType type       = GetSignalType(tile, track);
    01654   SignalVariant variant = GetSignalVariant(tile, track);
    01655
    01656   if (type == SIGTYPE_NORMAL && variant == SIG_ELECTRIC) {
    01657     /* Normal electric signals are picked from original sprites. */
    01658     sprite = SPR_ORIGINAL_SIGNALS_BASE + image + condition;
    01659   } else {
    01660     /* All other signals are picked from add on sprites. */
    01661     sprite = SPR_SIGNALS_BASE + (type - 1) * 16 + variant * 64 + image + condition + (type > SIGTYPE_LAST_NOPBS ? 64 : 0);
    01662   }
    01663
    01664   AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, GetSaveSlopeZ(x, y, track));
    01665 }
    01666
    01667 static uint32 _drawtile_track_palette;
    01668
    01669
    01670 static void DrawTrackFence_NW(const TileInfo *ti, SpriteID base_image)
    01671 {
    01672   RailFenceOffset rfo = RFO_FLAT_X;
    01673   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
    01674   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01675     ti->x, ti->y + 1, 16, 1, 4, ti->z);
    01676 }
    01677
    01678 static void DrawTrackFence_SE(const TileInfo *ti, SpriteID base_image)
    01679 {
    01680   RailFenceOffset rfo = RFO_FLAT_X;
    01681   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
    01682   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01683     ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
    01684 }
    01685
    01686 static void DrawTrackFence_NW_SE(const TileInfo *ti, SpriteID base_image)
    01687 {
    01688   DrawTrackFence_NW(ti, base_image);
    01689   DrawTrackFence_SE(ti, base_image);
    01690 }
    01691
    01692 static void DrawTrackFence_NE(const TileInfo *ti, SpriteID base_image)
    01693 {
    01694   RailFenceOffset rfo = RFO_FLAT_Y;
    01695   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
    01696   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01697     ti->x + 1, ti->y, 1, 16, 4, ti->z);
    01698 }
    01699
    01700 static void DrawTrackFence_SW(const TileInfo *ti, SpriteID base_image)
    01701 {
    01702   RailFenceOffset rfo = RFO_FLAT_Y;
    01703   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
    01704   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01705     ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
    01706 }
    01707
    01708 static void DrawTrackFence_NE_SW(const TileInfo *ti, SpriteID base_image)
    01709 {
    01710   DrawTrackFence_NE(ti, base_image);
    01711   DrawTrackFence_SW(ti, base_image);
    01712 }
    01713
    01717 static void DrawTrackFence_NS_1(const TileInfo *ti, SpriteID base_image)
    01718 {
    01719   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_W);
    01720   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
    01721     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01722 }
    01723
    01727 static void DrawTrackFence_NS_2(const TileInfo *ti, SpriteID base_image)
    01728 {
    01729   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_E);
    01730   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
    01731     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01732 }
    01733
    01737 static void DrawTrackFence_WE_1(const TileInfo *ti, SpriteID base_image)
    01738 {
    01739   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_N);
    01740   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
    01741     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01742 }
    01743
    01747 static void DrawTrackFence_WE_2(const TileInfo *ti, SpriteID base_image)
    01748 {
    01749   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_S);
    01750   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
    01751     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01752 }
    01753
    01754
    01755 static void DrawTrackDetails(const TileInfo *ti, const RailtypeInfo *rti)
    01756 {
    01757   /* Base sprite for track fences.
    01758    * Note: Halftile slopes only have fences on the upper part. */
    01759   SpriteID base_image = GetCustomRailSprite(rti, ti->tile, RTSG_FENCES, IsHalftileSlope(ti->tileh));
    01760   if (base_image == 0) base_image = SPR_TRACK_FENCE_FLAT_X;
    01761
    01762   switch (GetRailGroundType(ti->tile)) {
    01763     case RAIL_GROUND_FENCE_NW:     DrawTrackFence_NW(ti, base_image);    break;
    01764     case RAIL_GROUND_FENCE_SE:     DrawTrackFence_SE(ti, base_image);    break;
    01765     case RAIL_GROUND_FENCE_SENW:   DrawTrackFence_NW_SE(ti, base_image); break;
    01766     case RAIL_GROUND_FENCE_NE:     DrawTrackFence_NE(ti, base_image);    break;
    01767     case RAIL_GROUND_FENCE_SW:     DrawTrackFence_SW(ti, base_image);    break;
    01768     case RAIL_GROUND_FENCE_NESW:   DrawTrackFence_NE_SW(ti, base_image); break;
    01769     case RAIL_GROUND_FENCE_VERT1:  DrawTrackFence_NS_1(ti, base_image);  break;
    01770     case RAIL_GROUND_FENCE_VERT2:  DrawTrackFence_NS_2(ti, base_image);  break;
    01771     case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti, base_image);  break;
    01772     case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti, base_image);  break;
    01773     case RAIL_GROUND_WATER: {
    01774       Corner track_corner;
    01775       if (IsHalftileSlope(ti->tileh)) {
    01776         /* Steep slope or one-corner-raised slope with halftile foundation */
    01777         track_corner = GetHalftileSlopeCorner(ti->tileh);
    01778       } else {
    01779         /* Three-corner-raised slope */
    01780         track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    01781       }
    01782       switch (track_corner) {
    01783         case CORNER_W: DrawTrackFence_NS_1(ti, base_image); break;
    01784         case CORNER_S: DrawTrackFence_WE_2(ti, base_image); break;
    01785         case CORNER_E: DrawTrackFence_NS_2(ti, base_image); break;
    01786         case CORNER_N: DrawTrackFence_WE_1(ti, base_image); break;
    01787         default: NOT_REACHED();
    01788       }
    01789       break;
    01790     }
    01791     default: break;
    01792   }
    01793 }
    01794
    01795 /* SubSprite for drawing the track halftile of 'three-corners-raised'-sloped rail sprites. */
    01796 static const int INF = 1000; // big number compared to tilesprite size
    01797 static const SubSprite _halftile_sub_sprite[4] = {
    01798   { -INF    , -INF  , 32 - 33, INF     }, // CORNER_W, clip 33 pixels from right
    01799   { -INF    ,  0 + 7, INF    , INF     }, // CORNER_S, clip 7 pixels from top
    01800   { -31 + 33, -INF  , INF    , INF     }, // CORNER_E, clip 33 pixels from left
    01801   { -INF    , -INF  , INF    , 30 - 23 }  // CORNER_N, clip 23 pixels from bottom
    01802 };
    01803
    01804 static inline void DrawTrackSprite(SpriteID sprite, PaletteID pal, const TileInfo *ti, Slope s)
    01805 {
    01806   DrawGroundSprite(sprite, pal, NULL, 0, (ti->tileh & s) ? -8 : 0);
    01807 }
    01808
    01809 static void DrawTrackBitsOverlay(TileInfo *ti, TrackBits track, const RailtypeInfo *rti)
    01810 {
    01811   RailGroundType rgt = GetRailGroundType(ti->tile);
    01812   Foundation f = GetRailFoundation(ti->tileh, track);
    01813   Corner halftile_corner = CORNER_INVALID;
    01814
    01815   if (IsNonContinuousFoundation(f)) {
    01816     /* Save halftile corner */
    01817     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
    01818     /* Draw lower part first */
    01819     track &= ~CornerToTrackBits(halftile_corner);
    01820     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
    01821   }
    01822
    01823   DrawFoundation(ti, f);
    01824   /* DrawFoundation modifies ti */
    01825
    01826   /* Draw ground */
    01827   if (track == TRACK_BIT_NONE && rgt == RAIL_GROUND_WATER) {
    01828     if (IsSteepSlope(ti->tileh)) {
    01829       DrawShoreTile(ti->tileh);
    01830     } else {
    01831       DrawGroundSprite(SPR_FLAT_WATER_TILE, PAL_NONE);
    01832     }
    01833   } else {
    01834     SpriteID image;
    01835
    01836     switch (rgt) {
    01837       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01838       case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
    01839       default:                     image = SPR_FLAT_GRASS_TILE; break;
    01840     }
    01841
    01842     image += _tileh_to_sprite[ti->tileh];
    01843
    01844     DrawGroundSprite(image, PAL_NONE);
    01845   }
    01846
    01847   SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
    01848   SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
    01849   TrackBits pbs = _settings_client.gui.show_track_reservation ? GetRailReservationTrackBits(ti->tile) : TRACK_BIT_NONE;
    01850
    01851   if (track == TRACK_BIT_NONE) {
    01852     /* Half-tile foundation, no track here? */
    01853   } else if (ti->tileh == SLOPE_NW && track == TRACK_BIT_Y) {
    01854     DrawGroundSprite(ground + RTO_SLOPE_NW, PAL_NONE);
    01855     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 9, PALETTE_CRASH);
    01856   } else if (ti->tileh == SLOPE_NE && track == TRACK_BIT_X) {
    01857     DrawGroundSprite(ground + RTO_SLOPE_NE, PAL_NONE);
    01858     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 6, PALETTE_CRASH);
    01859   } else if (ti->tileh == SLOPE_SE && track == TRACK_BIT_Y) {
    01860     DrawGroundSprite(ground + RTO_SLOPE_SE, PAL_NONE);
    01861     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 7, PALETTE_CRASH);
    01862   } else if (ti->tileh == SLOPE_SW && track == TRACK_BIT_X) {
    01863     DrawGroundSprite(ground + RTO_SLOPE_SW, PAL_NONE);
    01864     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 8, PALETTE_CRASH);
    01865   } else {
    01866     switch (track) {
    01867       /* Draw single ground sprite when not overlapping. No track overlay
    01868        * is necessary for these sprites. */
    01869       case TRACK_BIT_X:     DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
    01870       case TRACK_BIT_Y:     DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
    01871       case TRACK_BIT_UPPER: DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N); break;
    01872       case TRACK_BIT_LOWER: DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
    01873       case TRACK_BIT_RIGHT: DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E); break;
    01874       case TRACK_BIT_LEFT:  DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
    01875       case TRACK_BIT_CROSS: DrawGroundSprite(ground + RTO_CROSSING_XY, PAL_NONE); break;
    01876       case TRACK_BIT_HORZ:  DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N);
    01877                             DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
    01878       case TRACK_BIT_VERT:  DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E);
    01879                             DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
    01880
    01881       default:
    01882         /* We're drawing a junction tile */
    01883         if ((track & TRACK_BIT_3WAY_NE) == 0) {
    01884           DrawGroundSprite(ground + RTO_JUNCTION_SW, PAL_NONE);
    01885         } else if ((track & TRACK_BIT_3WAY_SW) == 0) {
    01886           DrawGroundSprite(ground + RTO_JUNCTION_NE, PAL_NONE);
    01887         } else if ((track & TRACK_BIT_3WAY_NW) == 0) {
    01888           DrawGroundSprite(ground + RTO_JUNCTION_SE, PAL_NONE);
    01889         } else if ((track & TRACK_BIT_3WAY_SE) == 0) {
    01890           DrawGroundSprite(ground + RTO_JUNCTION_NW, PAL_NONE);
    01891         } else {
    01892           DrawGroundSprite(ground + RTO_JUNCTION_NSEW, PAL_NONE);
    01893         }
    01894
    01895         /* Mask out PBS bits as we shall draw them afterwards anyway. */
    01896         track &= ~pbs;
    01897
    01898         /* Draw regular track bits */
    01899         if (track & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PAL_NONE);
    01900         if (track & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PAL_NONE);
    01901         if (track & TRACK_BIT_UPPER) DrawGroundSprite(overlay + RTO_N, PAL_NONE);
    01902         if (track & TRACK_BIT_LOWER) DrawGroundSprite(overlay + RTO_S, PAL_NONE);
    01903         if (track & TRACK_BIT_RIGHT) DrawGroundSprite(overlay + RTO_E, PAL_NONE);
    01904         if (track & TRACK_BIT_LEFT)  DrawGroundSprite(overlay + RTO_W, PAL_NONE);
    01905     }
    01906
    01907     /* Draw reserved track bits */
    01908     if (pbs & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH);
    01909     if (pbs & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH);
    01910     if (pbs & TRACK_BIT_UPPER) DrawTrackSprite(overlay + RTO_N, PALETTE_CRASH, ti, SLOPE_N);
    01911     if (pbs & TRACK_BIT_LOWER) DrawTrackSprite(overlay + RTO_S, PALETTE_CRASH, ti, SLOPE_S);
    01912     if (pbs & TRACK_BIT_RIGHT) DrawTrackSprite(overlay + RTO_E, PALETTE_CRASH, ti, SLOPE_E);
    01913     if (pbs & TRACK_BIT_LEFT)  DrawTrackSprite(overlay + RTO_W, PALETTE_CRASH, ti, SLOPE_W);
    01914   }
    01915
    01916   if (IsValidCorner(halftile_corner)) {
    01917     DrawFoundation(ti, HalftileFoundation(halftile_corner));
    01918     overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY, true);
    01919     ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND, true);
    01920
    01921     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
    01922     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    01923
    01924     SpriteID image;
    01925     switch (rgt) {
    01926       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01927       case RAIL_GROUND_ICE_DESERT:
    01928       case RAIL_GROUND_HALF_SNOW:  image = SPR_FLAT_SNOW_DESERT_TILE; break;
    01929       default:                     image = SPR_FLAT_GRASS_TILE; break;
    01930     }
    01931
    01932     image += _tileh_to_sprite[fake_slope];
    01933
    01934     DrawGroundSprite(image, PAL_NONE, &(_halftile_sub_sprite[halftile_corner]));
    01935
    01936     track = CornerToTrackBits(halftile_corner);
    01937
    01938     int offset;
    01939     switch (track) {
    01940       default: NOT_REACHED();
    01941       case TRACK_BIT_UPPER: offset = RTO_N; break;
    01942       case TRACK_BIT_LOWER: offset = RTO_S; break;
    01943       case TRACK_BIT_RIGHT: offset = RTO_E; break;
    01944       case TRACK_BIT_LEFT:  offset = RTO_W; break;
    01945     }
    01946
    01947     DrawTrackSprite(ground + offset, PAL_NONE, ti, fake_slope);
    01948     if (HasReservedTracks(ti->tile, track)) {
    01949       DrawTrackSprite(overlay + offset, PALETTE_CRASH, ti, fake_slope);
    01950     }
    01951   }
    01952 }
    01953
    01959 static void DrawTrackBits(TileInfo *ti, TrackBits track)
    01960 {
    01961   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    01962
    01963   if (rti->UsesOverlay()) {
    01964     DrawTrackBitsOverlay(ti, track, rti);
    01965     return;
    01966   }
    01967
    01968   RailGroundType rgt = GetRailGroundType(ti->tile);
    01969   Foundation f = GetRailFoundation(ti->tileh, track);
    01970   Corner halftile_corner = CORNER_INVALID;
    01971
    01972   if (IsNonContinuousFoundation(f)) {
    01973     /* Save halftile corner */
    01974     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
    01975     /* Draw lower part first */
    01976     track &= ~CornerToTrackBits(halftile_corner);
    01977     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
    01978   }
    01979
    01980   DrawFoundation(ti, f);
    01981   /* DrawFoundation modifies ti */
    01982
    01983   SpriteID image;
    01984   PaletteID pal = PAL_NONE;
    01985   const SubSprite *sub = NULL;
    01986   bool junction = false;
    01987
    01988   /* Select the sprite to use. */
    01989   if (track == 0) {
    01990     /* Clear ground (only track on halftile foundation) */
    01991     if (rgt == RAIL_GROUND_WATER) {
    01992       if (IsSteepSlope(ti->tileh)) {
    01993         DrawShoreTile(ti->tileh);
    01994         image = 0;
    01995       } else {
    01996         image = SPR_FLAT_WATER_TILE;
    01997       }
    01998     } else {
    01999       switch (rgt) {
    02000         case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    02001         case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
    02002         default:                     image = SPR_FLAT_GRASS_TILE; break;
    02003       }
    02004       image += _tileh_to_sprite[ti->tileh];
    02005     }
    02006   } else {
    02007     if (ti->tileh != SLOPE_FLAT) {
    02008       /* track on non-flat ground */
    02009       image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
    02010     } else {
    02011       /* track on flat ground */
    02012       (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
    02013       (image++,                           track == TRACK_BIT_X) ||
    02014       (image++,                           track == TRACK_BIT_UPPER) ||
    02015       (image++,                           track == TRACK_BIT_LOWER) ||
    02016       (image++,                           track == TRACK_BIT_RIGHT) ||
    02017       (image++,                           track == TRACK_BIT_LEFT) ||
    02018       (image++,                           track == TRACK_BIT_CROSS) ||
    02019
    02020       (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
    02021       (image++,                            track == TRACK_BIT_VERT) ||
    02022
    02023       (junction = true, false) ||
    02024       (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
    02025       (image++,                          (track & TRACK_BIT_3WAY_SW) == 0) ||
    02026       (image++,                          (track & TRACK_BIT_3WAY_NW) == 0) ||
    02027       (image++,                          (track & TRACK_BIT_3WAY_SE) == 0) ||
    02028       (image++, true);
    02029     }
    02030
    02031     switch (rgt) {
    02032       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    02033       case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset;  break;
    02034       case RAIL_GROUND_WATER: {
    02035         /* three-corner-raised slope */
    02036         DrawShoreTile(ti->tileh);
    02037         Corner track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    02038         sub = &(_halftile_sub_sprite[track_corner]);
    02039         break;
    02040       }
    02041       default: break;
    02042     }
    02043   }
    02044
    02045   if (image != 0) DrawGroundSprite(image, pal, sub);
    02046
    02047   /* Draw track pieces individually for junction tiles */
    02048   if (junction) {
    02049     if (track & TRACK_BIT_X)     DrawGroundSprite(rti->base_sprites.single_x, PAL_NONE);
    02050     if (track & TRACK_BIT_Y)     DrawGroundSprite(rti->base_sprites.single_y, PAL_NONE);
    02051     if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PAL_NONE);
    02052     if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PAL_NONE);
    02053     if (track & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PAL_NONE);
    02054     if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PAL_NONE);
    02055   }
    02056
    02057   /* PBS debugging, draw reserved tracks darker */
    02058   if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation) {
    02059     /* Get reservation, but mask track on halftile slope */
    02060     TrackBits pbs = GetRailReservationTrackBits(ti->tile) & track;
    02061     if (pbs & TRACK_BIT_X) {
    02062       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
    02063         DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH);
    02064       } else {
    02065         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
    02066       }
    02067     }
    02068     if (pbs & TRACK_BIT_Y) {
    02069       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
    02070         DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH);
    02071       } else {
    02072         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
    02073       }
    02074     }
    02075     if (pbs & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_N ? -TILE_HEIGHT : 0);
    02076     if (pbs & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_S ? -TILE_HEIGHT : 0);
    02077     if (pbs & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_W ? -TILE_HEIGHT : 0);
    02078     if (pbs & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_E ? -TILE_HEIGHT : 0);
    02079   }
    02080
    02081   if (IsValidCorner(halftile_corner)) {
    02082     DrawFoundation(ti, HalftileFoundation(halftile_corner));
    02083
    02084     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
    02085     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    02086     image = _track_sloped_sprites[fake_slope - 1] + rti->base_sprites.track_y;
    02087     pal = PAL_NONE;
    02088     switch (rgt) {
    02089       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    02090       case RAIL_GROUND_ICE_DESERT:
    02091       case RAIL_GROUND_HALF_SNOW:  image += rti->snow_offset;  break; // higher part has snow in this case too
    02092       default: break;
    02093     }
    02094     DrawGroundSprite(image, pal, &(_halftile_sub_sprite[halftile_corner]));
    02095
    02096     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, CornerToTrackBits(halftile_corner))) {
    02097       static const byte _corner_to_track_sprite[] = {3, 1, 2, 0};
    02098       DrawGroundSprite(_corner_to_track_sprite[halftile_corner] + rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, -TILE_HEIGHT);
    02099     }
    02100   }
    02101 }
    02102
    02108 enum {
    02109   SIGNAL_TO_SOUTHWEST =  0,
    02110   SIGNAL_TO_NORTHEAST =  2,
    02111   SIGNAL_TO_SOUTHEAST =  4,
    02112   SIGNAL_TO_NORTHWEST =  6,
    02113   SIGNAL_TO_EAST      =  8,
    02114   SIGNAL_TO_WEST      = 10,
    02115   SIGNAL_TO_SOUTH     = 12,
    02116   SIGNAL_TO_NORTH     = 14,
    02117 };
    02118
    02119 static void DrawSignals(TileIndex tile, TrackBits rails)
    02120 {
    02121 #define MAYBE_DRAW_SIGNAL(x, y, z, t) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, t, GetSingleSignalState(tile, x), y, z)
    02122
    02123   if (!(rails & TRACK_BIT_Y)) {
    02124     if (!(rails & TRACK_BIT_X)) {
    02125       if (rails & TRACK_BIT_LEFT) {
    02126         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTH, 0, TRACK_LEFT);
    02127         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTH, 1, TRACK_LEFT);
    02128       }
    02129       if (rails & TRACK_BIT_RIGHT) {
    02130         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_NORTH, 2, TRACK_RIGHT);
    02131         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_SOUTH, 3, TRACK_RIGHT);
    02132       }
    02133       if (rails & TRACK_BIT_UPPER) {
    02134         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_WEST, 4, TRACK_UPPER);
    02135         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_EAST, 5, TRACK_UPPER);
    02136       }
    02137       if (rails & TRACK_BIT_LOWER) {
    02138         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_WEST, 6, TRACK_LOWER);
    02139         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_EAST, 7, TRACK_LOWER);
    02140       }
    02141     } else {
    02142       MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHWEST, 8, TRACK_X);
    02143       MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHEAST, 9, TRACK_X);
    02144     }
    02145   } else {
    02146     MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHEAST, 10, TRACK_Y);
    02147     MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHWEST, 11, TRACK_Y);
    02148   }
    02149 }
    02150
    02151 static void DrawTile_Track(TileInfo *ti)
    02152 {
    02153   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    02154
    02155   _drawtile_track_palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
    02156
    02157   if (IsPlainRail(ti->tile)) {
    02158     TrackBits rails = GetTrackBits(ti->tile);
    02159
    02160     DrawTrackBits(ti, rails);
    02161
    02162     if (HasBit(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti, rti);
    02163
    02164     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    02165
    02166     if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
    02167   } else {
    02168     /* draw depot */
    02169     const DrawTileSprites *dts;
    02170     PaletteID pal = PAL_NONE;
    02171     SpriteID relocation;
    02172
    02173     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
    02174
    02175     if (IsInvisibilitySet(TO_BUILDINGS)) {
    02176       /* Draw rail instead of depot */
    02177       dts = &_depot_invisible_gfx_table[GetRailDepotDirection(ti->tile)];
    02178     } else {
    02179       dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
    02180     }
    02181
    02182     SpriteID image;
    02183     if (rti->UsesOverlay()) {
    02184       image = SPR_FLAT_GRASS_TILE;
    02185     } else {
    02186       image = dts->ground.sprite;
    02187       if (image != SPR_FLAT_GRASS_TILE) image += rti->total_offset;
    02188     }
    02189
    02190     /* adjust ground tile for desert
    02191      * don't adjust for snow, because snow in depots looks weird */
    02192     if (IsSnowRailGround(ti->tile) && _settings_game.game_creation.landscape == LT_TROPIC) {
    02193       if (image != SPR_FLAT_GRASS_TILE) {
    02194         image += rti->snow_offset; // tile with tracks
    02195       } else {
    02196         image = SPR_FLAT_SNOW_DESERT_TILE; // flat ground
    02197       }
    02198     }
    02199
    02200     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, _drawtile_track_palette));
    02201
    02202     if (rti->UsesOverlay()) {
    02203       SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
    02204
    02205       switch (GetRailDepotDirection(ti->tile)) {
    02206         case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02207         case DIAGDIR_SW: DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
    02208         case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02209         case DIAGDIR_SE: DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
    02210         default: break;
    02211       }
    02212
    02213       if (_settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
    02214         SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
    02215
    02216         switch (GetRailDepotDirection(ti->tile)) {
    02217           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02218           case DIAGDIR_SW: DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH); break;
    02219           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02220           case DIAGDIR_SE: DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH); break;
    02221           default: break;
    02222         }
    02223       }
    02224
    02225       relocation  = GetCustomRailSprite(rti, ti->tile, RTSG_DEPOT);
    02226       relocation -= SPR_RAIL_DEPOT_SE_1;
    02227     } else {
    02228       /* PBS debugging, draw reserved tracks darker */
    02229       if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
    02230         switch (GetRailDepotDirection(ti->tile)) {
    02231           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02232           case DIAGDIR_SW: DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH); break;
    02233           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02234           case DIAGDIR_SE: DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH); break;
    02235           default: break;
    02236         }
    02237       }
    02238
    02239       relocation = rti->total_offset;
    02240     }
    02241
    02242     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    02243
    02244     DrawRailTileSeq(ti, dts, TO_BUILDINGS, relocation, 0, _drawtile_track_palette);
    02245   }
    02246   DrawBridgeMiddle(ti);
    02247 }
    02248
    02249 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
    02250 {
    02251   const DrawTileSprites *dts = &_depot_gfx_table[dir];
    02252   const RailtypeInfo *rti = GetRailTypeInfo(railtype);
    02253   SpriteID image = rti->UsesOverlay() ? SPR_FLAT_GRASS_TILE : dts->ground.sprite;
    02254   uint32 offset = rti->total_offset;
    02255
    02256   x += 33;
    02257   y += 17;
    02258
    02259   if (image != SPR_FLAT_GRASS_TILE) image += offset;
    02260   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
    02261
    02262   DrawSprite(image, PAL_NONE, x, y);
    02263
    02264   if (rti->UsesOverlay()) {
    02265     SpriteID ground = GetCustomRailSprite(rti, INVALID_TILE, RTSG_GROUND);
    02266
    02267     switch (dir) {
    02268       case DIAGDIR_SW: DrawSprite(ground + RTO_X, PAL_NONE, x, y); break;
    02269       case DIAGDIR_SE: DrawSprite(ground + RTO_Y, PAL_NONE, x, y); break;
    02270       default: break;
    02271     }
    02272
    02273     offset  = GetCustomRailSprite(rti, INVALID_TILE, RTSG_DEPOT);
    02274     offset -= SPR_RAIL_DEPOT_SE_1;
    02275   }
    02276
    02277   DrawRailTileSeqInGUI(x, y, dts, offset, 0, palette);
    02278 }
    02279
    02280 static uint GetSlopeZ_Track(TileIndex tile, uint x, uint y)
    02281 {
    02282   uint z;
    02283   Slope tileh = GetTileSlope(tile, &z);
    02284
    02285   if (tileh == SLOPE_FLAT) return z;
    02286   if (IsPlainRail(tile)) {
    02287     z += ApplyFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
    02288     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
    02289   } else {
    02290     return z + TILE_HEIGHT;
    02291   }
    02292 }
    02293
    02294 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
    02295 {
    02296   return IsPlainRail(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
    02297 }
    02298
    02299 static void TileLoop_Track(TileIndex tile)
    02300 {
    02301   RailGroundType old_ground = GetRailGroundType(tile);
    02302   RailGroundType new_ground;
    02303
    02304   if (old_ground == RAIL_GROUND_WATER) {
    02305     TileLoop_Water(tile);
    02306     return;
    02307   }
    02308
    02309   switch (_settings_game.game_creation.landscape) {
    02310     case LT_ARCTIC: {
    02311       uint z;
    02312       Slope slope = GetTileSlope(tile, &z);
    02313       bool half = false;
    02314
    02315       /* for non-flat track, use lower part of track
    02316        * in other cases, use the highest part with track */
    02317       if (IsPlainRail(tile)) {
    02318         TrackBits track = GetTrackBits(tile);
    02319         Foundation f = GetRailFoundation(slope, track);
    02320
    02321         switch (f) {
    02322           case FOUNDATION_NONE:
    02323             /* no foundation - is the track on the upper side of three corners raised tile? */
    02324             if (IsSlopeWithThreeCornersRaised(slope)) z += TILE_HEIGHT;
    02325             break;
    02326
    02327           case FOUNDATION_INCLINED_X:
    02328           case FOUNDATION_INCLINED_Y:
    02329             /* sloped track - is it on a steep slope? */
    02330             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    02331             break;
    02332
    02333           case FOUNDATION_STEEP_LOWER:
    02334             /* only lower part of steep slope */
    02335             z += TILE_HEIGHT;
    02336             break;
    02337
    02338           default:
    02339             /* if it is a steep slope, then there is a track on higher part */
    02340             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    02341             z += TILE_HEIGHT;
    02342             break;
    02343         }
    02344
    02345         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
    02346       } else {
    02347         /* is the depot on a non-flat tile? */
    02348         if (slope != SLOPE_FLAT) z += TILE_HEIGHT;
    02349       }
    02350
    02351       /* 'z' is now the lowest part of the highest track bit -
    02352        * for sloped track, it is 'z' of lower part
    02353        * for two track bits, it is 'z' of higher track bit
    02354        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
    02355       if (z > GetSnowLine()) {
    02356         if (half && z - GetSnowLine() == TILE_HEIGHT) {
    02357           /* track on non-continuous foundation, lower part is not under snow */
    02358           new_ground = RAIL_GROUND_HALF_SNOW;
    02359         } else {
    02360           new_ground = RAIL_GROUND_ICE_DESERT;
    02361         }
    02362         goto set_ground;
    02363       }
    02364       break;
    02365       }
    02366
    02367     case LT_TROPIC:
    02368       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
    02369         new_ground = RAIL_GROUND_ICE_DESERT;
    02370         goto set_ground;
    02371       }
    02372       break;
    02373   }
    02374
    02375   if (!IsPlainRail(tile)) return;
    02376
    02377   new_ground = RAIL_GROUND_GRASS;
    02378
    02379   if (old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
    02380     /* determine direction of fence */
    02381     TrackBits rail = GetTrackBits(tile);
    02382
    02383     switch (rail) {
    02384       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
    02385       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
    02386       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
    02387       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
    02388
    02389       default: {
    02390         Owner owner = GetTileOwner(tile);
    02391
    02392         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
    02393               (rail & TRACK_BIT_3WAY_NW) == 0 &&
    02394               (rail & TRACK_BIT_X)
    02395             )) {
    02396           TileIndex n = tile + TileDiffXY(0, -1);
    02397           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02398
    02399           if (!IsTileType(n, MP_RAILWAY) ||
    02400               !IsTileOwner(n, owner) ||
    02401               nrail == TRACK_BIT_UPPER ||
    02402               nrail == TRACK_BIT_LEFT) {
    02403             new_ground = RAIL_GROUND_FENCE_NW;
    02404           }
    02405         }
    02406
    02407         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
    02408               (rail & TRACK_BIT_3WAY_SE) == 0 &&
    02409               (rail & TRACK_BIT_X)
    02410             )) {
    02411           TileIndex n = tile + TileDiffXY(0, 1);
    02412           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02413
    02414           if (!IsTileType(n, MP_RAILWAY) ||
    02415               !IsTileOwner(n, owner) ||
    02416               nrail == TRACK_BIT_LOWER ||
    02417               nrail == TRACK_BIT_RIGHT) {
    02418             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
    02419               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
    02420           }
    02421         }
    02422
    02423         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
    02424               (rail & TRACK_BIT_3WAY_NE) == 0 &&
    02425               (rail & TRACK_BIT_Y)
    02426             )) {
    02427           TileIndex n = tile + TileDiffXY(-1, 0);
    02428           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02429
    02430           if (!IsTileType(n, MP_RAILWAY) ||
    02431               !IsTileOwner(n, owner) ||
    02432               nrail == TRACK_BIT_UPPER ||
    02433               nrail == TRACK_BIT_RIGHT) {
    02434             new_ground = RAIL_GROUND_FENCE_NE;
    02435           }
    02436         }
    02437
    02438         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
    02439               (rail & TRACK_BIT_3WAY_SW) == 0 &&
    02440               (rail & TRACK_BIT_Y)
    02441             )) {
    02442           TileIndex n = tile + TileDiffXY(1, 0);
    02443           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02444
    02445           if (!IsTileType(n, MP_RAILWAY) ||
    02446               !IsTileOwner(n, owner) ||
    02447               nrail == TRACK_BIT_LOWER ||
    02448               nrail == TRACK_BIT_LEFT) {
    02449             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
    02450               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
    02451           }
    02452         }
    02453         break;
    02454       }
    02455     }
    02456   }
    02457
    02458 set_ground:
    02459   if (old_ground != new_ground) {
    02460     SetRailGroundType(tile, new_ground);
    02461     MarkTileDirtyByTile(tile);
    02462   }
    02463 }
    02464
    02465
    02466 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
    02467 {
    02468   /* Case of half tile slope with water. */
    02469   if (mode == TRANSPORT_WATER && IsPlainRail(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
    02470     TrackBits tb = GetTrackBits(tile);
    02471     switch (tb) {
    02472       default: NOT_REACHED();
    02473       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
    02474       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
    02475       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
    02476       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
    02477     }
    02478     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
    02479   }
    02480
    02481   if (mode != TRANSPORT_RAIL) return 0;
    02482
    02483   TrackBits trackbits = TRACK_BIT_NONE;
    02484   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
    02485
    02486   switch (GetRailTileType(tile)) {
    02487     default: NOT_REACHED();
    02488     case RAIL_TILE_NORMAL:
    02489       trackbits = GetTrackBits(tile);
    02490       break;
    02491
    02492     case RAIL_TILE_SIGNALS: {
    02493       trackbits = GetTrackBits(tile);
    02494       byte a = GetPresentSignals(tile);
    02495       uint b = GetSignalStates(tile);
    02496
    02497       b &= a;
    02498
    02499       /* When signals are not present (in neither direction),
    02500        * we pretend them to be green. Otherwise, it depends on
    02501        * the signal type. For signals that are only active from
    02502        * one side, we set the missing signals explicitely to
    02503        * `green'. Otherwise, they implicitely become `red'. */
    02504       if (!IsOnewaySignal(tile, TRACK_UPPER) || (a & SignalOnTrack(TRACK_UPPER)) == 0) b |= ~a & SignalOnTrack(TRACK_UPPER);
    02505       if (!IsOnewaySignal(tile, TRACK_LOWER) || (a & SignalOnTrack(TRACK_LOWER)) == 0) b |= ~a & SignalOnTrack(TRACK_LOWER);
    02506
    02507       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
    02508       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
    02509       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
    02510       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
    02511
    02512       break;
    02513     }
    02514
    02515     case RAIL_TILE_DEPOT: {
    02516       DiagDirection dir = GetRailDepotDirection(tile);
    02517
    02518       if (side != INVALID_DIAGDIR && side != dir) break;
    02519
    02520       trackbits = DiagDirToDiagTrackBits(dir);
    02521       break;
    02522     }
    02523   }
    02524
    02525   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
    02526 }
    02527
    02528 static bool ClickTile_Track(TileIndex tile)
    02529 {
    02530   if (!IsRailDepot(tile)) return false;
    02531
    02532   ShowDepotWindow(tile, VEH_TRAIN);
    02533   return true;
    02534 }
    02535
    02536 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
    02537 {
    02538   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
    02539   td->rail_speed = rti->max_speed;
    02540   td->owner[0] = GetTileOwner(tile);
    02541   switch (GetRailTileType(tile)) {
    02542     case RAIL_TILE_NORMAL:
    02543       td->str = STR_LAI_RAIL_DESCRIPTION_TRACK;
    02544       break;
    02545
    02546     case RAIL_TILE_SIGNALS: {
    02547       static const StringID signal_type[6][6] = {
    02548         {
    02549           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_SIGNALS,
    02550           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
    02551           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
    02552           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02553           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
    02554           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS
    02555         },
    02556         {
    02557           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
    02558           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRESIGNALS,
    02559           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
    02560           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
    02561           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
    02562           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS
    02563         },
    02564         {
    02565           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
    02566           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
    02567           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXITSIGNALS,
    02568           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
    02569           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
    02570           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS
    02571         },
    02572         {
    02573           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02574           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
    02575           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
    02576           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBOSIGNALS,
    02577           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
    02578           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS
    02579         },
    02580         {
    02581           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
    02582           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
    02583           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
    02584           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
    02585           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBSSIGNALS,
    02586           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS
    02587         },
    02588         {
    02589           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS,
    02590           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS,
    02591           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS,
    02592           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS,
    02593           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS,
    02594           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NOENTRYSIGNALS
    02595         }
    02596       };
    02597
    02598       SignalType primary_signal;
    02599       SignalType secondary_signal;
    02600       if (HasSignalOnTrack(tile, TRACK_UPPER)) {
    02601         primary_signal = GetSignalType(tile, TRACK_UPPER);
    02602         secondary_signal = HasSignalOnTrack(tile, TRACK_LOWER) ? GetSignalType(tile, TRACK_LOWER) : primary_signal;
    02603       } else {
    02604         secondary_signal = primary_signal = GetSignalType(tile, TRACK_LOWER);
    02605       }
    02606
    02607       td->str = signal_type[secondary_signal][primary_signal];
    02608       break;
    02609     }
    02610
    02611     case RAIL_TILE_DEPOT:
    02612       td->str = STR_LAI_RAIL_DESCRIPTION_TRAIN_DEPOT;
    02613       if (_settings_game.vehicle.train_acceleration_model != AM_ORIGINAL) {
    02614         if (td->rail_speed > 0) {
    02615           td->rail_speed = min(td->rail_speed, 61);
    02616         } else {
    02617           td->rail_speed = 61;
    02618         }
    02619       }
    02620       break;
    02621
    02622     default:
    02623       NOT_REACHED();
    02624   }
    02625 }
    02626
    02627 static void ChangeTileOwner_Track(TileIndex tile, Owner old_owner, Owner new_owner)
    02628 {
    02629   if (!IsTileOwner(tile, old_owner)) return;
    02630
    02631   if (new_owner != INVALID_OWNER) {
    02632     SetTileOwner(tile, new_owner);
    02633   } else {
    02634     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
    02635   }
    02636 }
    02637
    02638 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
    02639 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
    02640 static const int8 _deltacoord_leaveoffset[8] = {
    02641   -1,  0,  1,  0, /* x */
    02642    0,  1,  0, -1  /* y */
    02643 };
    02644
    02645
    02651 int TicksToLeaveDepot(const Train *v)
    02652 {
    02653   DiagDirection dir = GetRailDepotDirection(v->tile);
    02654   int length = v->tcache.cached_veh_length;
    02655
    02656   switch (dir) {
    02657     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
    02658     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
    02659     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
    02660     default:
    02661     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
    02662   }
    02663
    02664   return 0; // make compilers happy
    02665 }
    02666
    02669 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *u, TileIndex tile, int x, int y)
    02670 {
    02671   /* this routine applies only to trains in depot tiles */
    02672   if (u->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
    02673
    02674   Train *v = Train::From(u);
    02675
    02676   /* depot direction */
    02677   DiagDirection dir = GetRailDepotDirection(tile);
    02678
    02679   /* calculate the point where the following wagon should be activated
    02680    * this depends on the length of the current vehicle */
    02681   int length = v->tcache.cached_veh_length;
    02682
    02683   byte fract_coord_leave =
    02684     ((_fractcoords_enter[dir] & 0x0F) + // x
    02685       (length + 1) * _deltacoord_leaveoffset[dir]) +
    02686     (((_fractcoords_enter[dir] >> 4) +  // y
    02687       ((length + 1) * _deltacoord_leaveoffset[dir + 4])) << 4);
    02688
    02689   byte fract_coord = (x & 0xF) + ((y & 0xF) << 4);
    02690
    02691   if (_fractcoords_behind[dir] == fract_coord) {
    02692     /* make sure a train is not entering the tile from behind */
    02693     return VETSB_CANNOT_ENTER;
    02694   } else if (_fractcoords_enter[dir] == fract_coord) {
    02695     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
    02696       /* enter the depot */
    02697       v->track = TRACK_BIT_DEPOT,
    02698       v->vehstatus |= VS_HIDDEN; // hide it
    02699       v->direction = ReverseDir(v->direction);
    02700       if (v->Next() == NULL) VehicleEnterDepot(v->First());
    02701       v->tile = tile;
    02702
    02703       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
    02704       return VETSB_ENTERED_WORMHOLE;
    02705     }
    02706   } else if (fract_coord_leave == fract_coord) {
    02707     if (DiagDirToDir(dir) == v->direction) {
    02708       /* leave the depot? */
    02709       if ((v = v->Next()) != NULL) {
    02710         v->vehstatus &= ~VS_HIDDEN;
    02711         v->track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
    02712       }
    02713     }
    02714   }
    02715
    02716   return VETSB_CONTINUE;
    02717 }
    02718
    02730 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, uint z_old, Slope tileh_old, uint z_new, Slope tileh_new, TrackBits rail_bits)
    02731 {
    02732   if (!_settings_game.construction.build_on_slopes || !AutoslopeEnabled()) return CMD_ERROR;
    02733
    02734   /* Is the slope-rail_bits combination valid in general? I.e. is it safe to call GetRailFoundation() ? */
    02735   if (CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile).Failed()) return CMD_ERROR;
    02736
    02737   /* Get the slopes on top of the foundations */
    02738   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
    02739   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
    02740
    02741   Corner track_corner;
    02742   switch (rail_bits) {
    02743     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
    02744     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
    02745     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
    02746     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
    02747
    02748     /* Surface slope must not be changed */
    02749     default: return (((z_old != z_new) || (tileh_old != tileh_new)) ? CMD_ERROR : CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]));
    02750   }
    02751
    02752   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
    02753   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
    02754   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
    02755   if (z_old != z_new) return CMD_ERROR;
    02756
    02757   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    02758   /* Make the ground dirty, if surface slope has changed */
    02759   if (tileh_old != tileh_new) {
    02760     /* If there is flat water on the lower halftile add the cost for clearing it */
    02761     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price[PR_CLEAR_WATER]);
    02762     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02763   }
    02764   return  cost;
    02765 }
    02766
    02767 static CommandCost TerraformTile_Track(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
    02768 {
    02769   uint z_old;
    02770   Slope tileh_old = GetTileSlope(tile, &z_old);
    02771   if (IsPlainRail(tile)) {
    02772     TrackBits rail_bits = GetTrackBits(tile);
    02773     /* Is there flat water on the lower halftile, that must be cleared expensively? */
    02774     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
    02775
    02776     _error_message = STR_ERROR_MUST_REMOVE_RAILROAD_TRACK;
    02777
    02778     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
    02779     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
    02780
    02781     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
    02782     Corner allowed_corner;
    02783     switch (rail_bits) {
    02784       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
    02785       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
    02786       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
    02787       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
    02788       default: return autoslope_result;
    02789     }
    02790
    02791     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
    02792
    02793     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
    02794     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
    02795
    02796     /* Everything is valid, which only changes allowed_corner */
    02797     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
    02798       if (allowed_corner == corner) continue;
    02799       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
    02800     }
    02801
    02802     /* Make the ground dirty */
    02803     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02804
    02805     /* allow terraforming */
    02806     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price[PR_CLEAR_WATER] : (Money)0);
    02807   } else if (_settings_game.construction.build_on_slopes && AutoslopeEnabled() &&
    02808       AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) {
    02809     return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    02810   }
    02811   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    02812 }
    02813
    02814
    02815 extern const TileTypeProcs _tile_type_rail_procs = {
    02816   DrawTile_Track,           // draw_tile_proc
    02817   GetSlopeZ_Track,          // get_slope_z_proc
    02818   ClearTile_Track,          // clear_tile_proc
    02819   NULL,                     // add_accepted_cargo_proc
    02820   GetTileDesc_Track,        // get_tile_desc_proc
    02821   GetTileTrackStatus_Track, // get_tile_track_status_proc
    02822   ClickTile_Track,          // click_tile_proc
    02823   NULL,                     // animate_tile_proc
    02824   TileLoop_Track,           // tile_loop_clear
    02825   ChangeTileOwner_Track,    // change_tile_owner_clear
    02826   NULL,                     // add_produced_cargo_proc
    02827   VehicleEnter_Track,       // vehicle_enter_tile_proc
    02828   GetFoundation_Track,      // get_foundation_proc
    02829   TerraformTile_Track,      // terraform_tile_proc
    02830 };