# rail_cmd.cpp

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    00001 /* $Id: rail_cmd.cpp 19928 2010-06-04 21:14:22Z rubidium $ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
    00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
    00008  */
    00009
    00012 #include "stdafx.h"
    00013 #include "cmd_helper.h"
    00014 #include "landscape.h"
    00015 #include "viewport_func.h"
    00016 #include "command_func.h"
    00017 #include "engine_base.h"
    00018 #include "depot_base.h"
    00019 #include "pathfinder/yapf/yapf_cache.h"
    00020 #include "newgrf_engine.h"
    00021 #include "landscape_type.h"
    00022 #include "newgrf_railtype.h"
    00023 #include "newgrf_commons.h"
    00024 #include "train.h"
    00025 #include "variables.h"
    00026 #include "autoslope.h"
    00027 #include "water.h"
    00028 #include "tunnelbridge_map.h"
    00029 #include "window_func.h"
    00030 #include "vehicle_func.h"
    00031 #include "sound_func.h"
    00032 #include "tunnelbridge.h"
    00033 #include "functions.h"
    00034 #include "elrail_func.h"
    00035 #include "town.h"
    00036 #include "pbs.h"
    00037 #include "company_base.h"
    00038
    00039 #include "table/strings.h"
    00040 #include "table/sprites.h"
    00041 #include "table/railtypes.h"
    00042 #include "table/track_land.h"
    00043
    00044 RailtypeInfo _railtypes[RAILTYPE_END];
    00045
    00046 assert_compile(sizeof(_original_railtypes) <= sizeof(_railtypes));
    00047
    00051 void ResetRailTypes()
    00052 {
    00053   memset(_railtypes, 0, sizeof(_railtypes));
    00054   memcpy(_railtypes, _original_railtypes, sizeof(_original_railtypes));
    00055 }
    00056
    00057 void ResolveRailTypeGUISprites(RailtypeInfo *rti)
    00058 {
    00059   SpriteID cursors_base = GetCustomRailSprite(rti, INVALID_TILE, RTSG_CURSORS);
    00060   if (cursors_base != 0) {
    00061     rti->gui_sprites.build_ns_rail = cursors_base +  0;
    00062     rti->gui_sprites.build_x_rail  = cursors_base +  1;
    00063     rti->gui_sprites.build_ew_rail = cursors_base +  2;
    00064     rti->gui_sprites.build_y_rail  = cursors_base +  3;
    00065     rti->gui_sprites.auto_rail     = cursors_base +  4;
    00066     rti->gui_sprites.build_depot   = cursors_base +  5;
    00067     rti->gui_sprites.build_tunnel  = cursors_base +  6;
    00068     rti->gui_sprites.convert_rail  = cursors_base +  7;
    00069     rti->cursor.rail_ns   = cursors_base +  8;
    00070     rti->cursor.rail_swne = cursors_base +  9;
    00071     rti->cursor.rail_ew   = cursors_base + 10;
    00072     rti->cursor.rail_nwse = cursors_base + 11;
    00073     rti->cursor.autorail  = cursors_base + 12;
    00074     rti->cursor.depot     = cursors_base + 13;
    00075     rti->cursor.tunnel    = cursors_base + 14;
    00076     rti->cursor.convert   = cursors_base + 15;
    00077   }
    00078 }
    00079
    00080 void InitRailTypes()
    00081 {
    00082   for (RailType rt = RAILTYPE_BEGIN; rt != RAILTYPE_END; rt++) {
    00083     RailtypeInfo *rti = &_railtypes[rt];
    00084     ResolveRailTypeGUISprites(rti);
    00085   }
    00086 }
    00087
    00088 RailType AllocateRailType(RailTypeLabel label)
    00089 {
    00090   for (RailType rt = RAILTYPE_BEGIN; rt != RAILTYPE_END; rt++) {
    00091     RailtypeInfo *rti = &_railtypes[rt];
    00092
    00093     if (rti->label == 0) {
    00094       /* Set up new rail type */
    00095       memcpy(rti, &_railtypes[RAILTYPE_RAIL], sizeof(*rti));
    00096       rti->label = label;
    00097
    00098       /* Make us compatible with ourself. */
    00099       rti->powered_railtypes    = (RailTypes)(1 << rt);
    00100       rti->compatible_railtypes = (RailTypes)(1 << rt);
    00101       return rt;
    00102     }
    00103   }
    00104
    00105   return INVALID_RAILTYPE;
    00106 }
    00107
    00108 static const byte _track_sloped_sprites[14] = {
    00109   14, 15, 22, 13,
    00110    0, 21, 17, 12,
    00111   23,  0, 18, 20,
    00112   19, 16
    00113 };
    00114
    00115
    00116 /*         4
    00117  *     ---------
    00118  *    |\       /|
    00119  *    | \    1/ |
    00120  *    |  \   /  |
    00121  *    |   \ /   |
    00122  *  16|    \    |32
    00123  *    |   / \2  |
    00124  *    |  /   \  |
    00125  *    | /     \ |
    00126  *    |/       \|
    00127  *     ---------
    00128  *         8
    00129  */
    00130
    00131
    00132
    00133 /* MAP2 byte:    abcd???? => Signal On? Same coding as map3lo
    00134  * MAP3LO byte:  abcd???? => Signal Exists?
    00135  *               a and b are for diagonals, upper and left,
    00136  *               one for each direction. (ie a == NE->SW, b ==
    00137  *               SW->NE, or v.v., I don't know. b and c are
    00138  *               similar for lower and right.
    00139  * MAP2 byte:    ????abcd => Type of ground.
    00140  * MAP3LO byte:  ????abcd => Type of rail.
    00141  * MAP5:         00abcdef => rail
    00142  *               01abcdef => rail w/ signals
    00143  *               10uuuuuu => unused
    00144  *               11uuuudd => rail depot
    00145  */
    00146
    00147
    00148 Vehicle *EnsureNoTrainOnTrackProc(Vehicle *v, void *data)
    00149 {
    00150   TrackBits rail_bits = *(TrackBits *)data;
    00151
    00152   if (v->type != VEH_TRAIN) return NULL;
    00153
    00154   Train *t = Train::From(v);
    00155   if ((t->track != rail_bits) && !TracksOverlap(t->track | rail_bits)) return NULL;
    00156
    00157   _error_message = STR_ERROR_TRAIN_IN_THE_WAY + v->type;
    00158   return v;
    00159 }
    00160
    00168 static bool EnsureNoTrainOnTrack(TileIndex tile, Track track)
    00169 {
    00170   TrackBits rail_bits = TrackToTrackBits(track);
    00171
    00172   return !HasVehicleOnPos(tile, &rail_bits, &EnsureNoTrainOnTrackProc);
    00173 }
    00174
    00181 static CommandCost CheckTrackCombination(TileIndex tile, TrackBits to_build, uint flags)
    00182 {
    00183   if (!IsPlainRail(tile)) return_cmd_error(STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION);
    00184
    00185   /* So, we have a tile with tracks on it (and possibly signals). Let's see
    00186    * what tracks first */
    00187   TrackBits current = GetTrackBits(tile); // The current track layout.
    00188   TrackBits future = current | to_build;  // The track layout we want to build.
    00189
    00190   /* Are we really building something new? */
    00191   if (current == future) {
    00192     /* Nothing new is being built */
    00193     return_cmd_error(STR_ERROR_ALREADY_BUILT);
    00194   }
    00195
    00196   /* Let's see if we may build this */
    00197   if ((flags & DC_NO_RAIL_OVERLAP) || HasSignals(tile)) {
    00198     /* If we are not allowed to overlap (flag is on for ai companies or we have
    00199      * signals on the tile), check that */
    00200     if (future != TRACK_BIT_HORZ && future != TRACK_BIT_VERT) {
    00201       return_cmd_error((flags & DC_NO_RAIL_OVERLAP) ? STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION : STR_ERROR_MUST_REMOVE_SIGNALS_FIRST);
    00202     }
    00203   }
    00204   /* Normally, we may overlap and any combination is valid */
    00205   return CommandCost();
    00206 }
    00207
    00208
    00210 static const TrackBits _valid_tracks_without_foundation[15] = {
    00211   TRACK_BIT_ALL,
    00212   TRACK_BIT_RIGHT,
    00213   TRACK_BIT_UPPER,
    00214   TRACK_BIT_X,
    00215
    00216   TRACK_BIT_LEFT,
    00217   TRACK_BIT_NONE,
    00218   TRACK_BIT_Y,
    00219   TRACK_BIT_LOWER,
    00220
    00221   TRACK_BIT_LOWER,
    00222   TRACK_BIT_Y,
    00223   TRACK_BIT_NONE,
    00224   TRACK_BIT_LEFT,
    00225
    00226   TRACK_BIT_X,
    00227   TRACK_BIT_UPPER,
    00228   TRACK_BIT_RIGHT,
    00229 };
    00230
    00232 static const TrackBits _valid_tracks_on_leveled_foundation[15] = {
    00233   TRACK_BIT_NONE,
    00234   TRACK_BIT_LEFT,
    00235   TRACK_BIT_LOWER,
    00236   TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,
    00237
    00238   TRACK_BIT_RIGHT,
    00239   TRACK_BIT_ALL,
    00240   TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,
    00241   TRACK_BIT_ALL,
    00242
    00243   TRACK_BIT_UPPER,
    00244   TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,
    00245   TRACK_BIT_ALL,
    00246   TRACK_BIT_ALL,
    00247
    00248   TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,
    00249   TRACK_BIT_ALL,
    00250   TRACK_BIT_ALL
    00251 };
    00252
    00260 Foundation GetRailFoundation(Slope tileh, TrackBits bits)
    00261 {
    00262   if (bits == TRACK_BIT_NONE) return FOUNDATION_NONE;
    00263
    00264   if (IsSteepSlope(tileh)) {
    00265     /* Test for inclined foundations */
    00266     if (bits == TRACK_BIT_X) return FOUNDATION_INCLINED_X;
    00267     if (bits == TRACK_BIT_Y) return FOUNDATION_INCLINED_Y;
    00268
    00269     /* Get higher track */
    00270     Corner highest_corner = GetHighestSlopeCorner(tileh);
    00271     TrackBits higher_track = CornerToTrackBits(highest_corner);
    00272
    00273     /* Only higher track? */
    00274     if (bits == higher_track) return HalftileFoundation(highest_corner);
    00275
    00276     /* Overlap with higher track? */
    00277     if (TracksOverlap(bits | higher_track)) return FOUNDATION_INVALID;
    00278
    00279     /* either lower track or both higher and lower track */
    00280     return ((bits & higher_track) != 0 ? FOUNDATION_STEEP_BOTH : FOUNDATION_STEEP_LOWER);
    00281   } else {
    00282     if ((~_valid_tracks_without_foundation[tileh] & bits) == 0) return FOUNDATION_NONE;
    00283
    00284     bool valid_on_leveled = ((~_valid_tracks_on_leveled_foundation[tileh] & bits) == 0);
    00285
    00286     Corner track_corner;
    00287     switch (bits) {
    00288       case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
    00289       case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
    00290       case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
    00291       case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
    00292
    00293       case TRACK_BIT_HORZ:
    00294         if (tileh == SLOPE_N) return HalftileFoundation(CORNER_N);
    00295         if (tileh == SLOPE_S) return HalftileFoundation(CORNER_S);
    00296         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00297
    00298       case TRACK_BIT_VERT:
    00299         if (tileh == SLOPE_W) return HalftileFoundation(CORNER_W);
    00300         if (tileh == SLOPE_E) return HalftileFoundation(CORNER_E);
    00301         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00302
    00303       case TRACK_BIT_X:
    00304         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_X;
    00305         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00306
    00307       case TRACK_BIT_Y:
    00308         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_Y;
    00309         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00310
    00311       default:
    00312         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00313     }
    00314     /* Single diagonal track */
    00315
    00316     /* Track must be at least valid on leveled foundation */
    00317     if (!valid_on_leveled) return FOUNDATION_INVALID;
    00318
    00319     /* If slope has three raised corners, build leveled foundation */
    00320     if (IsSlopeWithThreeCornersRaised(tileh)) return FOUNDATION_LEVELED;
    00321
    00322     /* If neighboured corners of track_corner are lowered, build halftile foundation */
    00323     if ((tileh & SlopeWithThreeCornersRaised(OppositeCorner(track_corner))) == SlopeWithOneCornerRaised(track_corner)) return HalftileFoundation(track_corner);
    00324
    00325     /* else special anti-zig-zag foundation */
    00326     return SpecialRailFoundation(track_corner);
    00327   }
    00328 }
    00329
    00330
    00340 static CommandCost CheckRailSlope(Slope tileh, TrackBits rail_bits, TrackBits existing, TileIndex tile)
    00341 {
    00342   /* don't allow building on the lower side of a coast */
    00343   if (IsTileType(tile, MP_WATER) || (IsTileType(tile, MP_RAILWAY) && (GetRailGroundType(tile) == RAIL_GROUND_WATER))) {
    00344     if (!IsSteepSlope(tileh) && ((~_valid_tracks_on_leveled_foundation[tileh] & (rail_bits | existing)) != 0)) return_cmd_error(STR_ERROR_CAN_T_BUILD_ON_WATER);
    00345   }
    00346
    00347   Foundation f_new = GetRailFoundation(tileh, rail_bits | existing);
    00348
    00349   /* check track/slope combination */
    00350   if ((f_new == FOUNDATION_INVALID) ||
    00351       ((f_new != FOUNDATION_NONE) && (!_settings_game.construction.build_on_slopes))) {
    00352     return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
    00353   }
    00354
    00355   Foundation f_old = GetRailFoundation(tileh, existing);
    00356   return CommandCost(EXPENSES_CONSTRUCTION, f_new != f_old ? _price[PR_BUILD_FOUNDATION] : (Money)0);
    00357 }
    00358
    00359 /* Validate functions for rail building */
    00360 static inline bool ValParamTrackOrientation(Track track) {return IsValidTrack(track);}
    00361
    00370 CommandCost CmdBuildSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00371 {
    00372   RailType railtype = 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         RoadTypes roadtypes = GetRoadTypes(tile);
    00435         RoadBits road = GetRoadBits(tile, ROADTYPE_ROAD);
    00436         RoadBits tram = GetRoadBits(tile, ROADTYPE_TRAM);
    00437         switch (roadtypes) {
    00438           default: break;
    00439           case ROADTYPES_TRAM:
    00440             /* Tram crossings must always have road. */
    00441             if (flags & DC_EXEC) SetRoadOwner(tile, ROADTYPE_ROAD, _current_company);
    00442             roadtypes |= ROADTYPES_ROAD;
    00443             break;
    00444
    00445           case ROADTYPES_ALL:
    00446             if (road != tram) return CMD_ERROR;
    00447             break;
    00448         }
    00449
    00450         road |= tram;
    00451
    00452         if ((track == TRACK_X && road == ROAD_Y) ||
    00453             (track == TRACK_Y && road == ROAD_X)) {
    00454           if (flags & DC_EXEC) {
    00455             MakeRoadCrossing(tile, GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), _current_company, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, roadtypes, GetTownIndex(tile));
    00456             UpdateLevelCrossing(tile, false);
    00457           }
    00458           break;
    00459         }
    00460       }
    00461
    00462       if (IsLevelCrossing(tile) && GetCrossingRailBits(tile) == trackbit) {
    00463         return_cmd_error(STR_ERROR_ALREADY_BUILT);
    00464       }
    00465       /* FALLTHROUGH */
    00466
    00467     default: {
    00468       /* Will there be flat water on the lower halftile? */
    00469       bool water_ground = IsTileType(tile, MP_WATER) && IsSlopeWithOneCornerRaised(tileh);
    00470
    00471       CommandCost ret = CheckRailSlope(tileh, trackbit, TRACK_BIT_NONE, tile);
    00472       if (ret.Failed()) return ret;
    00473       cost.AddCost(ret);
    00474
    00475       ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00476       if (ret.Failed()) return ret;
    00477       cost.AddCost(ret);
    00478
    00479       if (water_ground) {
    00480         cost.AddCost(-_price[PR_CLEAR_WATER]);
    00481         cost.AddCost(_price[PR_CLEAR_ROUGH]);
    00482       }
    00483
    00484       if (flags & DC_EXEC) {
    00485         MakeRailNormal(tile, _current_company, trackbit, railtype);
    00486         if (water_ground) SetRailGroundType(tile, RAIL_GROUND_WATER);
    00487       }
    00488       break;
    00489     }
    00490   }
    00491
    00492   if (flags & DC_EXEC) {
    00493     MarkTileDirtyByTile(tile);
    00494     AddTrackToSignalBuffer(tile, track, _current_company);
    00495     YapfNotifyTrackLayoutChange(tile, track);
    00496   }
    00497
    00498   cost.AddCost(RailBuildCost(railtype));
    00499   return cost;
    00500 }
    00501
    00510 CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00511 {
    00512   Track track = Extract<Track, 0, 3>(p2);
    00513   CommandCost cost(EXPENSES_CONSTRUCTION);
    00514   bool crossing = false;
    00515
    00516   if (!ValParamTrackOrientation(track)) return CMD_ERROR;
    00517   TrackBits trackbit = TrackToTrackBits(track);
    00518
    00519   /* Need to read tile owner now because it may change when the rail is removed
    00520    * Also, in case of floods, _current_company != owner
    00521    * There may be invalid tiletype even in exec run (when removing long track),
    00522    * so do not call GetTileOwner(tile) in any case here */
    00523   Owner owner = INVALID_OWNER;
    00524
    00525   Train *v = NULL;
    00526
    00527   switch (GetTileType(tile)) {
    00528     case MP_ROAD: {
    00529       if (!IsLevelCrossing(tile) ||
    00530           GetCrossingRailBits(tile) != trackbit ||
    00531           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
    00532           (!(flags & DC_BANKRUPT) && !EnsureNoVehicleOnGround(tile))) {
    00533         return CMD_ERROR;
    00534       }
    00535
    00536       cost.AddCost(RailClearCost(GetRailType(tile)));
    00537
    00538       if (flags & DC_EXEC) {
    00539         if (HasReservedTracks(tile, trackbit)) {
    00540           v = GetTrainForReservation(tile, track);
    00541           if (v != NULL) FreeTrainTrackReservation(v);
    00542         }
    00543         owner = GetTileOwner(tile);
    00544         MakeRoadNormal(tile, GetCrossingRoadBits(tile), GetRoadTypes(tile), GetTownIndex(tile), GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM));
    00545       }
    00546       break;
    00547     }
    00548
    00549     case MP_RAILWAY: {
    00550       TrackBits present;
    00551
    00552       if (!IsPlainRail(tile) ||
    00553           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
    00554           !EnsureNoTrainOnTrack(tile, track)) {
    00555         return CMD_ERROR;
    00556       }
    00557
    00558       present = GetTrackBits(tile);
    00559       if ((present & trackbit) == 0) return CMD_ERROR;
    00560       if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
    00561
    00562       cost.AddCost(RailClearCost(GetRailType(tile)));
    00563
    00564       /* Charge extra to remove signals on the track, if they are there */
    00565       if (HasSignalOnTrack(tile, track))
    00566         cost.AddCost(DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS));
    00567
    00568       if (flags & DC_EXEC) {
    00569         if (HasReservedTracks(tile, trackbit)) {
    00570           v = GetTrainForReservation(tile, track);
    00571           if (v != NULL) FreeTrainTrackReservation(v);
    00572         }
    00573         owner = GetTileOwner(tile);
    00574         present ^= trackbit;
    00575         if (present == 0) {
    00576           Slope tileh = GetTileSlope(tile, NULL);
    00577           /* If there is flat water on the lower halftile, convert the tile to shore so the water remains */
    00578           if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh)) {
    00579             MakeShore(tile);
    00580           } else {
    00581             DoClearSquare(tile);
    00582           }
    00583         } else {
    00584           SetTrackBits(tile, present);
    00585           SetTrackReservation(tile, GetRailReservationTrackBits(tile) & present);
    00586         }
    00587       }
    00588       break;
    00589     }
    00590
    00591     default: return CMD_ERROR;
    00592   }
    00593
    00594   if (flags & DC_EXEC) {
    00595     /* if we got that far, 'owner' variable is set correctly */
    00596     assert(Company::IsValidID(owner));
    00597
    00598     MarkTileDirtyByTile(tile);
    00599     if (crossing) {
    00600       /* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we
    00601        * are removing one of these pieces, we'll need to update signals for
    00602        * both directions explicitly, as after the track is removed it won't
    00603        * 'connect' with the other piece. */
    00604       AddTrackToSignalBuffer(tile, TRACK_X, owner);
    00605       AddTrackToSignalBuffer(tile, TRACK_Y, owner);
    00606       YapfNotifyTrackLayoutChange(tile, TRACK_X);
    00607       YapfNotifyTrackLayoutChange(tile, TRACK_Y);
    00608     } else {
    00609       AddTrackToSignalBuffer(tile, track, owner);
    00610       YapfNotifyTrackLayoutChange(tile, track);
    00611     }
    00612
    00613     if (v != NULL) TryPathReserve(v, true);
    00614   }
    00615
    00616   return cost;
    00617 }
    00618
    00619
    00627 bool FloodHalftile(TileIndex t)
    00628 {
    00629   assert(IsPlainRailTile(t));
    00630
    00631   bool flooded = false;
    00632   if (GetRailGroundType(t) == RAIL_GROUND_WATER) return flooded;
    00633
    00634   Slope tileh = GetTileSlope(t, NULL);
    00635   TrackBits rail_bits = GetTrackBits(t);
    00636
    00637   if (IsSlopeWithOneCornerRaised(tileh)) {
    00638     TrackBits lower_track = CornerToTrackBits(OppositeCorner(GetHighestSlopeCorner(tileh)));
    00639
    00640     TrackBits to_remove = lower_track & rail_bits;
    00641     if (to_remove != 0) {
    00642       _current_company = OWNER_WATER;
    00643       if (DoCommand(t, 0, FIND_FIRST_BIT(to_remove), DC_EXEC, CMD_REMOVE_SINGLE_RAIL).Failed()) return flooded; // not yet floodable
    00644       flooded = true;
    00645       rail_bits = rail_bits & ~to_remove;
    00646       if (rail_bits == 0) {
    00647         MakeShore(t);
    00648         MarkTileDirtyByTile(t);
    00649         return flooded;
    00650       }
    00651     }
    00652
    00653     if (IsNonContinuousFoundation(GetRailFoundation(tileh, rail_bits))) {
    00654       flooded = true;
    00655       SetRailGroundType(t, RAIL_GROUND_WATER);
    00656       MarkTileDirtyByTile(t);
    00657     }
    00658   } else {
    00659     /* Make shore on steep slopes and 'three-corners-raised'-slopes. */
    00660     if (ApplyFoundationToSlope(GetRailFoundation(tileh, rail_bits), &tileh) == 0) {
    00661       if (IsSteepSlope(tileh) || IsSlopeWithThreeCornersRaised(tileh)) {
    00662         flooded = true;
    00663         SetRailGroundType(t, RAIL_GROUND_WATER);
    00664         MarkTileDirtyByTile(t);
    00665       }
    00666     }
    00667   }
    00668   return flooded;
    00669 }
    00670
    00671 static const TileIndexDiffC _trackdelta[] = {
    00672   { -1,  0 }, {  0,  1 }, { -1,  0 }, {  0,  1 }, {  1,  0 }, {  0,  1 },
    00673   {  0,  0 },
    00674   {  0,  0 },
    00675   {  1,  0 }, {  0, -1 }, {  0, -1 }, {  1,  0 }, {  0, -1 }, { -1,  0 },
    00676   {  0,  0 },
    00677   {  0,  0 }
    00678 };
    00679
    00680
    00681 static CommandCost ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)
    00682 {
    00683   int x = TileX(start);
    00684   int y = TileY(start);
    00685   int ex = TileX(end);
    00686   int ey = TileY(end);
    00687
    00688   if (!ValParamTrackOrientation(TrackdirToTrack(*trackdir))) return CMD_ERROR;
    00689
    00690   /* calculate delta x,y from start to end tile */
    00691   int dx = ex - x;
    00692   int dy = ey - y;
    00693
    00694   /* calculate delta x,y for the first direction */
    00695   int trdx = _trackdelta[*trackdir].x;
    00696   int trdy = _trackdelta[*trackdir].y;
    00697
    00698   if (!IsDiagonalTrackdir(*trackdir)) {
    00699     trdx += _trackdelta[*trackdir ^ 1].x;
    00700     trdy += _trackdelta[*trackdir ^ 1].y;
    00701   }
    00702
    00703   /* validate the direction */
    00704   while (
    00705     (trdx <= 0 && dx > 0) ||
    00706     (trdx >= 0 && dx < 0) ||
    00707     (trdy <= 0 && dy > 0) ||
    00708     (trdy >= 0 && dy < 0)
    00709   ) {
    00710     if (!HasBit(*trackdir, 3)) { // first direction is invalid, try the other
    00711       SetBit(*trackdir, 3); // reverse the direction
    00712       trdx = -trdx;
    00713       trdy = -trdy;
    00714     } else { // other direction is invalid too, invalid drag
    00715       return CMD_ERROR;
    00716     }
    00717   }
    00718
    00719   /* (for diagonal tracks, this is already made sure of by above test), but:
    00720    * for non-diagonal tracks, check if the start and end tile are on 1 line */
    00721   if (!IsDiagonalTrackdir(*trackdir)) {
    00722     trdx = _trackdelta[*trackdir].x;
    00723     trdy = _trackdelta[*trackdir].y;
    00724     if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx))
    00725       return CMD_ERROR;
    00726   }
    00727
    00728   return CommandCost();
    00729 }
    00730
    00743 static CommandCost CmdRailTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00744 {
    00745   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
    00746   Track track = Extract<Track, 4, 3>(p2);
    00747   bool remove = HasBit(p2, 7);
    00748   RailType railtype = Extract<RailType, 0, 4>(p2);
    00749
    00750   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
    00751   if (p1 >= MapSize()) return CMD_ERROR;
    00752   TileIndex end_tile = p1;
    00753   Trackdir trackdir = TrackToTrackdir(track);
    00754
    00755   if (ValidateAutoDrag(&trackdir, tile, end_tile).Failed()) return CMD_ERROR;
    00756
    00757   if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, tile);
    00758
    00759   for (;;) {
    00760     ret = DoCommand(tile, railtype, TrackdirToTrack(trackdir), flags, remove ? CMD_REMOVE_SINGLE_RAIL : CMD_BUILD_SINGLE_RAIL);
    00761
    00762     if (ret.Failed()) {
    00763       if (_error_message != STR_ERROR_ALREADY_BUILT && !remove) {
    00764         if (HasBit(p2, 8)) return CMD_ERROR;
    00765         break;
    00766       }
    00767       _error_message = INVALID_STRING_ID;
    00768     } else {
    00769       total_cost.AddCost(ret);
    00770     }
    00771
    00772     if (tile == end_tile) break;
    00773
    00774     tile += ToTileIndexDiff(_trackdelta[trackdir]);
    00775
    00776     /* toggle railbit for the non-diagonal tracks */
    00777     if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
    00778   }
    00779
    00780   return (total_cost.GetCost() == 0) ? CommandCost(remove ? INVALID_STRING_ID : (_error_message == INVALID_STRING_ID ? STR_ERROR_ALREADY_BUILT : _error_message)) : total_cost;
    00781 }
    00782
    00796 CommandCost CmdBuildRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00797 {
    00798   return CmdRailTrackHelper(tile, flags, p1, ClrBit(p2, 7), text);
    00799 }
    00800
    00814 CommandCost CmdRemoveRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00815 {
    00816   return CmdRailTrackHelper(tile, flags, p1, SetBit(p2, 7), text);
    00817 }
    00818
    00830 CommandCost CmdBuildTrainDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00831 {
    00832   /* check railtype and valid direction for depot (0 through 3), 4 in total */
    00833   RailType railtype = Extract<RailType, 0, 4>(p1);
    00834   if (!ValParamRailtype(railtype)) return CMD_ERROR;
    00835
    00836   Slope tileh = GetTileSlope(tile, NULL);
    00837
    00838   DiagDirection dir = Extract<DiagDirection, 0, 2>(p2);
    00839
    00840   /* Prohibit construction if
    00841    * The tile is non-flat AND
    00842    * 1) build-on-slopes is disabled
    00843    * 2) the tile is steep i.e. spans two height levels
    00844    * 3) the exit points in the wrong direction
    00845    */
    00846
    00847   if (tileh != SLOPE_FLAT && (
    00848         !_settings_game.construction.build_on_slopes ||
    00849         IsSteepSlope(tileh) ||
    00850         !CanBuildDepotByTileh(dir, tileh)
    00851       )) {
    00852     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
    00853   }
    00854
    00855   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00856   if (cost.Failed()) return CMD_ERROR;
    00857
    00858   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
    00859
    00860   if (!Depot::CanAllocateItem()) return CMD_ERROR;
    00861
    00862   if (flags & DC_EXEC) {
    00863     Depot *d = new Depot(tile);
    00864     d->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
    00865
    00866     MakeRailDepot(tile, _current_company, d->index, dir, railtype);
    00867     MarkTileDirtyByTile(tile);
    00868
    00869     AddSideToSignalBuffer(tile, INVALID_DIAGDIR, _current_company);
    00870     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
    00871   }
    00872
    00873   cost.AddCost(_price[PR_BUILD_DEPOT_TRAIN]);
    00874   cost.AddCost(RailBuildCost(railtype));
    00875   return cost;
    00876 }
    00877
    00898 CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00899 {
    00900   Track track = Extract<Track, 0, 3>(p1);
    00901   bool ctrl_pressed = HasBit(p1, 3); // was the CTRL button pressed
    00902   SignalVariant sigvar = (ctrl_pressed ^ HasBit(p1, 4)) ? SIG_SEMAPHORE : SIG_ELECTRIC; // the signal variant of the new signal
    00903   SignalType sigtype = Extract<SignalType, 5, 3>(p1); // the signal type of the new signal
    00904   bool convert_signal = HasBit(p1, 8); // convert button pressed
    00905   SignalType cycle_start = Extract<SignalType, 9, 3>(p1);
    00906   SignalType cycle_stop = Extract<SignalType, 12, 3>(p1);
    00907   uint num_dir_cycle = GB(p1, 15, 2);
    00908
    00909   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
    00910   if (cycle_start > cycle_stop || cycle_stop > SIGTYPE_LAST) return CMD_ERROR;
    00911
    00912   /* You can only build signals on plain rail tiles, and the selected track must exist */
    00913   if (!ValParamTrackOrientation(track) || !IsPlainRailTile(tile) ||
    00914       !HasTrack(tile, track) || !EnsureNoTrainOnTrack(tile, track)) {
    00915     return CMD_ERROR;
    00916   }
    00917
    00918   /* Protect against invalid signal copying */
    00919   if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
    00920
    00921   if (!CheckTileOwnership(tile)) return CMD_ERROR;
    00922
    00923   {
    00924     /* See if this is a valid track combination for signals, (ie, no overlap) */
    00925     TrackBits trackbits = GetTrackBits(tile);
    00926     if (KillFirstBit(trackbits) != TRACK_BIT_NONE && // More than one track present
    00927         trackbits != TRACK_BIT_HORZ &&
    00928         trackbits != TRACK_BIT_VERT) {
    00929       return_cmd_error(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK);
    00930     }
    00931   }
    00932
    00933   /* In case we don't want to change an existing signal, return without error. */
    00934   if (HasBit(p1, 17) && HasSignalOnTrack(tile, track)) return CommandCost();
    00935
    00936   /* you can not convert a signal if no signal is on track */
    00937   if (convert_signal && !HasSignalOnTrack(tile, track)) return CMD_ERROR;
    00938
    00939   CommandCost cost;
    00940   if (!HasSignalOnTrack(tile, track)) {
    00941     /* build new signals */
    00942     cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS]);
    00943   } else {
    00944     if (p2 != 0 && sigvar != GetSignalVariant(tile, track)) {
    00945       /* convert signals <-> semaphores */
    00946       cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
    00947
    00948     } else if (convert_signal) {
    00949       /* convert button pressed */
    00950       if (ctrl_pressed || GetSignalVariant(tile, track) != sigvar) {
    00951         /* convert electric <-> semaphore */
    00952         cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
    00953       } else {
    00954         /* it is free to change signal type: normal-pre-exit-combo */
    00955         cost = CommandCost();
    00956       }
    00957
    00958     } else {
    00959       /* it is free to change orientation/pre-exit-combo signals */
    00960       cost = CommandCost();
    00961     }
    00962   }
    00963
    00964   if (flags & DC_EXEC) {
    00965     Train *v = NULL;
    00966     /* The new/changed signal could block our path. As this can lead to
    00967      * stale reservations, we clear the path reservation here and try
    00968      * to redo it later on. */
    00969     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
    00970       v = GetTrainForReservation(tile, track);
    00971       if (v != NULL) FreeTrainTrackReservation(v);
    00972     }
    00973
    00974     if (!HasSignals(tile)) {
    00975       /* there are no signals at all on this tile yet */
    00976       SetHasSignals(tile, true);
    00977       SetSignalStates(tile, 0xF); // all signals are on
    00978       SetPresentSignals(tile, 0); // no signals built by default
    00979       SetSignalType(tile, track, sigtype);
    00980       SetSignalVariant(tile, track, sigvar);
    00981     }
    00982
    00983     if (p2 == 0) {
    00984       if (!HasSignalOnTrack(tile, track)) {
    00985         /* build new signals */
    00986         SetPresentSignals(tile, GetPresentSignals(tile) | (IsPbsSignal(sigtype) ? KillFirstBit(SignalOnTrack(track)) : SignalOnTrack(track)));
    00987         SetSignalType(tile, track, sigtype);
    00988         SetSignalVariant(tile, track, sigvar);
    00989         while (num_dir_cycle-- > 0) CycleSignalSide(tile, track);
    00990       } else {
    00991         if (convert_signal) {
    00992           /* convert signal button pressed */
    00993           if (ctrl_pressed) {
    00994             /* toggle the pressent signal variant: SIG_ELECTRIC <-> SIG_SEMAPHORE */
    00995             SetSignalVariant(tile, track, (GetSignalVariant(tile, track) == SIG_ELECTRIC) ? SIG_SEMAPHORE : SIG_ELECTRIC);
    00996             /* Query current signal type so the check for PBS signals below works. */
    00997             sigtype = GetSignalType(tile, track);
    00998           } else {
    00999             /* convert the present signal to the chosen type and variant */
    01000             SetSignalType(tile, track, sigtype);
    01001             SetSignalVariant(tile, track, sigvar);
    01002             if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
    01003               SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
    01004             }
    01005           }
    01006
    01007         } else if (ctrl_pressed) {
    01008           /* cycle between cycle_start and cycle_end */
    01009           sigtype = (SignalType)(GetSignalType(tile, track) + 1);
    01010
    01011           if (sigtype < cycle_start || sigtype > cycle_stop) sigtype = cycle_start;
    01012
    01013           SetSignalType(tile, track, sigtype);
    01014           if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
    01015             SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
    01016           }
    01017         } else {
    01018           /* cycle the signal side: both -> left -> right -> both -> ... */
    01019           CycleSignalSide(tile, track);
    01020           /* Query current signal type so the check for PBS signals below works. */
    01021           sigtype = GetSignalType(tile, track);
    01022         }
    01023       }
    01024     } else {
    01025       /* If CmdBuildManySignals is called with copying signals, just copy the
    01026        * direction of the first signal given as parameter by CmdBuildManySignals */
    01027       SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | (p2 & SignalOnTrack(track)));
    01028       SetSignalVariant(tile, track, sigvar);
    01029       SetSignalType(tile, track, sigtype);
    01030     }
    01031
    01032     if (IsPbsSignal(sigtype)) {
    01033       /* PBS signals should show red unless they are on a reservation. */
    01034       uint mask = GetPresentSignals(tile) & SignalOnTrack(track);
    01035       SetSignalStates(tile, (GetSignalStates(tile) & ~mask) | ((HasBit(GetRailReservationTrackBits(tile), track) ? UINT_MAX : 0) & mask));
    01036     }
    01037     MarkTileDirtyByTile(tile);
    01038     AddTrackToSignalBuffer(tile, track, _current_company);
    01039     YapfNotifyTrackLayoutChange(tile, track);
    01040     if (v != NULL) {
    01041       /* Extend the train's path if it's not stopped or loading, or not at a safe position. */
    01042       if (!(((v->vehstatus & VS_STOPPED) && v->cur_speed == 0) || v->current_order.IsType(OT_LOADING)) ||
    01043           !IsSafeWaitingPosition(v, v->tile, v->GetVehicleTrackdir(), true, _settings_game.pf.forbid_90_deg)) {
    01044         TryPathReserve(v, true);
    01045       }
    01046     }
    01047   }
    01048
    01049   return cost;
    01050 }
    01051
    01052 static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
    01053 {
    01054   tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
    01055   if (tile == INVALID_TILE) return false;
    01056
    01057   /* Check for track bits on the new tile */
    01058   TrackdirBits trackdirbits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
    01059
    01060   if (TracksOverlap(TrackdirBitsToTrackBits(trackdirbits))) return false;
    01061   trackdirbits &= TrackdirReachesTrackdirs(trackdir);
    01062
    01063   /* No track bits, must stop */
    01064   if (trackdirbits == TRACKDIR_BIT_NONE) return false;
    01065
    01066   /* Get the first track dir */
    01067   trackdir = RemoveFirstTrackdir(&trackdirbits);
    01068
    01069   /* Any left? It's a junction so we stop */
    01070   if (trackdirbits != TRACKDIR_BIT_NONE) return false;
    01071
    01072   switch (GetTileType(tile)) {
    01073     case MP_RAILWAY:
    01074       if (IsRailDepot(tile)) return false;
    01075       if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
    01076       signal_ctr++;
    01077       if (IsDiagonalTrackdir(trackdir)) {
    01078         signal_ctr++;
    01079         /* Ensure signal_ctr even so X and Y pieces get signals */
    01080         ClrBit(signal_ctr, 0);
    01081       }
    01082       return true;
    01083
    01084     case MP_ROAD:
    01085       if (!IsLevelCrossing(tile)) return false;
    01086       signal_ctr += 2;
    01087       return true;
    01088
    01089     case MP_TUNNELBRIDGE: {
    01090       TileIndex orig_tile = tile; // backup old value
    01091
    01092       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
    01093       if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
    01094
    01095       /* Skip to end of tunnel or bridge
    01096        * note that tile is a parameter by reference, so it must be updated */
    01097       tile = GetOtherTunnelBridgeEnd(tile);
    01098
    01099       signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
    01100       return true;
    01101     }
    01102
    01103     default: return false;
    01104   }
    01105 }
    01106
    01122 static CommandCost CmdSignalTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01123 {
    01124   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
    01125   bool err = true;
    01126   TileIndex start_tile = tile;
    01127
    01128   Track track = Extract<Track, 0, 3>(p2);
    01129   bool mode = HasBit(p2, 3);
    01130   bool semaphores = HasBit(p2, 4);
    01131   bool remove = HasBit(p2, 5);
    01132   bool autofill = HasBit(p2, 6);
    01133   byte signal_density = GB(p2, 24, 8);
    01134
    01135   if (p1 >= MapSize() || !ValParamTrackOrientation(track)) return CMD_ERROR;
    01136   TileIndex end_tile = p1;
    01137   if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
    01138
    01139   if (!IsPlainRailTile(tile)) return CMD_ERROR;
    01140
    01141   /* for vertical/horizontal tracks, double the given signals density
    01142    * since the original amount will be too dense (shorter tracks) */
    01143   signal_density *= 2;
    01144
    01145   Trackdir trackdir = TrackToTrackdir(track);
    01146   if (ValidateAutoDrag(&trackdir, tile, end_tile).Failed()) return CMD_ERROR;
    01147
    01148   track = TrackdirToTrack(trackdir); // trackdir might have changed, keep track in sync
    01149   Trackdir start_trackdir = trackdir;
    01150
    01151   /* Must start on a valid track to be able to avoid loops */
    01152   if (!HasTrack(tile, track)) return CMD_ERROR;
    01153
    01154   SignalType sigtype = (SignalType)GB(p2, 7, 3);
    01155   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
    01156
    01157   byte signals;
    01158   /* copy the signal-style of the first rail-piece if existing */
    01159   if (HasSignalOnTrack(tile, track)) {
    01160     signals = GetPresentSignals(tile) & SignalOnTrack(track);
    01161     assert(signals != 0);
    01162
    01163     /* copy signal/semaphores style (independent of CTRL) */
    01164     semaphores = GetSignalVariant(tile, track) != SIG_ELECTRIC;
    01165
    01166     sigtype = GetSignalType(tile, track);
    01167     /* Don't but copy pre-signal type */
    01168     if (sigtype < SIGTYPE_PBS) sigtype = SIGTYPE_NORMAL;
    01169   } else { // no signals exist, drag a two-way signal stretch
    01170     signals = IsPbsSignal(sigtype) ? SignalAlongTrackdir(trackdir) : SignalOnTrack(track);
    01171   }
    01172
    01173   byte signal_dir = 0;
    01174   if (signals & SignalAlongTrackdir(trackdir))   SetBit(signal_dir, 0);
    01175   if (signals & SignalAgainstTrackdir(trackdir)) SetBit(signal_dir, 1);
    01176
    01177   /* signal_ctr         - amount of tiles already processed
    01178    * signals_density    - setting to put signal on every Nth tile (double space on |, -- tracks)
    01179    **********
    01180    * trackdir   - trackdir to build with autorail
    01181    * semaphores - semaphores or signals
    01182    * signals    - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
    01183    *              and convert all others to semaphore/signal
    01184    * remove     - 1 remove signals, 0 build signals */
    01185   int signal_ctr = 0;
    01186   for (;;) {
    01187     /* only build/remove signals with the specified density */
    01188     if ((remove && autofill) || signal_ctr % signal_density == 0) {
    01189       uint32 p1 = GB(TrackdirToTrack(trackdir), 0, 3);
    01190       SB(p1, 3, 1, mode);
    01191       SB(p1, 4, 1, semaphores);
    01192       SB(p1, 5, 3, sigtype);
    01193       if (!remove && signal_ctr == 0) SetBit(p1, 17);
    01194
    01195       /* Pick the correct orientation for the track direction */
    01196       signals = 0;
    01197       if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
    01198       if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
    01199
    01200       ret = DoCommand(tile, p1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
    01201
    01202       /* Be user-friendly and try placing signals as much as possible */
    01203       if (ret.Succeeded()) {
    01204         err = false;
    01205         total_cost.AddCost(ret);
    01206       }
    01207     }
    01208
    01209     if (autofill) {
    01210       if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
    01211
    01212       /* Prevent possible loops */
    01213       if (tile == start_tile && trackdir == start_trackdir) break;
    01214     } else {
    01215       if (tile == end_tile) break;
    01216
    01217       tile += ToTileIndexDiff(_trackdelta[trackdir]);
    01218       signal_ctr++;
    01219
    01220       /* toggle railbit for the non-diagonal tracks (|, -- tracks) */
    01221       if (IsDiagonalTrackdir(trackdir)) {
    01222         signal_ctr++;
    01223       } else {
    01224         ToggleBit(trackdir, 0);
    01225       }
    01226     }
    01227   }
    01228
    01229   return err ? CMD_ERROR : total_cost;
    01230 }
    01231
    01249 CommandCost CmdBuildSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01250 {
    01251   return CmdSignalTrackHelper(tile, flags, p1, p2, text);
    01252 }
    01253
    01265 CommandCost CmdRemoveSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01266 {
    01267   Track track = Extract<Track, 0, 3>(p1);
    01268
    01269   if (!ValParamTrackOrientation(track) ||
    01270       !IsPlainRailTile(tile) ||
    01271       !HasTrack(tile, track) ||
    01272       !EnsureNoTrainOnTrack(tile, track) ||
    01273       !HasSignalOnTrack(tile, track)) {
    01274     return CMD_ERROR;
    01275   }
    01276
    01277   /* Only water can remove signals from anyone */
    01278   if (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) return CMD_ERROR;
    01279
    01280   /* Do it? */
    01281   if (flags & DC_EXEC) {
    01282     Train *v = NULL;
    01283     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
    01284       v = GetTrainForReservation(tile, track);
    01285     } else if (IsPbsSignal(GetSignalType(tile, track))) {
    01286       /* PBS signal, might be the end of a path reservation. */
    01287       Trackdir td = TrackToTrackdir(track);
    01288       for (int i = 0; v == NULL && i < 2; i++, td = ReverseTrackdir(td)) {
    01289         /* Only test the active signal side. */
    01290         if (!HasSignalOnTrackdir(tile, ReverseTrackdir(td))) continue;
    01291         TileIndex next = TileAddByDiagDir(tile, TrackdirToExitdir(td));
    01292         TrackBits tracks = TrackdirBitsToTrackBits(TrackdirReachesTrackdirs(td));
    01293         if (HasReservedTracks(next, tracks)) {
    01294           v = GetTrainForReservation(next, TrackBitsToTrack(GetReservedTrackbits(next) & tracks));
    01295         }
    01296       }
    01297     }
    01298     SetPresentSignals(tile, GetPresentSignals(tile) & ~SignalOnTrack(track));
    01299
    01300     /* removed last signal from tile? */
    01301     if (GetPresentSignals(tile) == 0) {
    01302       SetSignalStates(tile, 0);
    01303       SetHasSignals(tile, false);
    01304       SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
    01305     }
    01306
    01307     AddTrackToSignalBuffer(tile, track, GetTileOwner(tile));
    01308     YapfNotifyTrackLayoutChange(tile, track);
    01309     if (v != NULL) TryPathReserve(v, false);
    01310
    01311     MarkTileDirtyByTile(tile);
    01312   }
    01313
    01314   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_SIGNALS]);
    01315 }
    01316
    01334 CommandCost CmdRemoveSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01335 {
    01336   return CmdSignalTrackHelper(tile, flags, p1, SetBit(p2, 5), text); // bit 5 is remove bit
    01337 }
    01338
    01340 static Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
    01341 {
    01342   if (v->type != VEH_TRAIN) return NULL;
    01343
    01344   /* Similar checks as in Train::PowerChanged() */
    01345
    01346   Train *t = Train::From(v);
    01347   if (t->IsArticulatedPart()) return NULL;
    01348
    01349   const RailVehicleInfo *rvi = RailVehInfo(t->engine_type);
    01350   if (GetVehicleProperty(t, PROP_TRAIN_POWER, rvi->power) != 0) t->First()->PowerChanged();
    01351
    01352   return NULL;
    01353 }
    01354
    01364 CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01365 {
    01366   CommandCost cost(EXPENSES_CONSTRUCTION);
    01367   RailType totype = Extract<RailType, 0, 4>(p2);
    01368
    01369   if (!ValParamRailtype(totype)) return CMD_ERROR;
    01370   if (p1 >= MapSize()) return CMD_ERROR;
    01371
    01372   uint ex = TileX(tile);
    01373   uint ey = TileY(tile);
    01374   uint sx = TileX(p1);
    01375   uint sy = TileY(p1);
    01376
    01377   /* make sure sx,sy are smaller than ex,ey */
    01378   if (ex < sx) Swap(ex, sx);
    01379   if (ey < sy) Swap(ey, sy);
    01380
    01381   _error_message = STR_ERROR_NO_SUITABLE_RAILROAD_TRACK; // by default, there is no track to convert
    01382
    01383   for (uint x = sx; x <= ex; ++x) {
    01384     for (uint y = sy; y <= ey; ++y) {
    01385       TileIndex tile = TileXY(x, y);
    01386       TileType tt = GetTileType(tile);
    01387
    01388       /* Check if there is any track on tile */
    01389       switch (tt) {
    01390         case MP_RAILWAY:
    01391           break;
    01392         case MP_STATION:
    01393           if (!HasStationRail(tile)) continue;
    01394           break;
    01395         case MP_ROAD:
    01396           if (!IsLevelCrossing(tile)) continue;
    01397           break;
    01398         case MP_TUNNELBRIDGE:
    01399           if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
    01400           break;
    01401         default: continue;
    01402       }
    01403
    01404       /* Original railtype we are converting from */
    01405       RailType type = GetRailType(tile);
    01406
    01407       /* Converting to the same type or converting 'hidden' elrail -> rail */
    01408       if (type == totype || (_settings_game.vehicle.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
    01409
    01410       /* Trying to convert other's rail */
    01411       if (!CheckTileOwnership(tile)) continue;
    01412
    01413       SmallVector<Train *, 2> vehicles_affected;
    01414
    01415       /* Vehicle on the tile when not converting Rail <-> ElRail
    01416        * Tunnels and bridges have special check later */
    01417       if (tt != MP_TUNNELBRIDGE) {
    01418         if (!IsCompatibleRail(type, totype) && !EnsureNoVehicleOnGround(tile)) continue;
    01419         if (flags & DC_EXEC) { // we can safely convert, too
    01420           TrackBits reserved = GetReservedTrackbits(tile);
    01421           Track     track;
    01422           while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
    01423             Train *v = GetTrainForReservation(tile, track);
    01424             if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
    01425               /* No power on new rail type, reroute. */
    01426               FreeTrainTrackReservation(v);
    01427               *vehicles_affected.Append() = v;
    01428             }
    01429           }
    01430
    01431           SetRailType(tile, totype);
    01432           MarkTileDirtyByTile(tile);
    01433           /* update power of train engines on this tile */
    01434           FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
    01435         }
    01436       }
    01437
    01438       switch (tt) {
    01439         case MP_RAILWAY:
    01440           switch (GetRailTileType(tile)) {
    01441             case RAIL_TILE_DEPOT:
    01442               if (flags & DC_EXEC) {
    01443                 /* notify YAPF about the track layout change */
    01444                 YapfNotifyTrackLayoutChange(tile, GetRailDepotTrack(tile));
    01445
    01446                 /* Update build vehicle window related to this depot */
    01447                 InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
    01448                 InvalidateWindowData(WC_BUILD_VEHICLE, tile);
    01449               }
    01450               cost.AddCost(RailConvertCost(type, totype));
    01451               break;
    01452
    01453             default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
    01454               if (flags & DC_EXEC) {
    01455                 /* notify YAPF about the track layout change */
    01456                 TrackBits tracks = GetTrackBits(tile);
    01457                 while (tracks != TRACK_BIT_NONE) {
    01458                   YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
    01459                 }
    01460               }
    01461               cost.AddCost(RailConvertCost(type, totype) * CountBits(GetTrackBits(tile)));
    01462               break;
    01463           }
    01464           break;
    01465
    01466         case MP_TUNNELBRIDGE: {
    01467           TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
    01468
    01469           /* If both ends of tunnel/bridge are in the range, do not try to convert twice -
    01470            * it would cause assert because of different test and exec runs */
    01471           if (endtile < tile && TileX(endtile) >= sx && TileX(endtile) <= ex &&
    01472               TileY(endtile) >= sy && TileY(endtile) <= ey) continue;
    01473
    01474           /* When not coverting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
    01475           if (!IsCompatibleRail(GetRailType(tile), totype) &&
    01476               HasVehicleOnTunnelBridge(tile, endtile)) continue;
    01477
    01478           if (flags & DC_EXEC) {
    01479             Track track = DiagDirToDiagTrack(GetTunnelBridgeDirection(tile));
    01480             if (HasTunnelBridgeReservation(tile)) {
    01481               Train *v = GetTrainForReservation(tile, track);
    01482               if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
    01483                 /* No power on new rail type, reroute. */
    01484                 FreeTrainTrackReservation(v);
    01485                 *vehicles_affected.Append() = v;
    01486               }
    01487             }
    01488             SetRailType(tile, totype);
    01489             SetRailType(endtile, totype);
    01490
    01491             FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
    01492             FindVehicleOnPos(endtile, NULL, &UpdateTrainPowerProc);
    01493
    01494             YapfNotifyTrackLayoutChange(tile, track);
    01495             YapfNotifyTrackLayoutChange(endtile, track);
    01496
    01497             MarkTileDirtyByTile(tile);
    01498             MarkTileDirtyByTile(endtile);
    01499
    01500             if (IsBridge(tile)) {
    01501               TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
    01502               TileIndex t = tile + delta;
    01503               for (; t != endtile; t += delta) MarkTileDirtyByTile(t); // TODO encapsulate this into a function
    01504             }
    01505           }
    01506
    01507           cost.AddCost((GetTunnelBridgeLength(tile, endtile) + 2) * RailConvertCost(type, totype));
    01508         } break;
    01509
    01510         default: // MP_STATION, MP_ROAD
    01511           if (flags & DC_EXEC) {
    01512             Track track = ((tt == MP_STATION) ? GetRailStationTrack(tile) : GetCrossingRailTrack(tile));
    01513             YapfNotifyTrackLayoutChange(tile, track);
    01514           }
    01515
    01516           cost.AddCost(RailConvertCost(type, totype));
    01517           break;
    01518       }
    01519
    01520       for (uint i = 0; i < vehicles_affected.Length(); ++i) {
    01521         TryPathReserve(vehicles_affected[i], true);
    01522       }
    01523     }
    01524   }
    01525
    01526   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
    01527 }
    01528
    01529 static CommandCost RemoveTrainDepot(TileIndex tile, DoCommandFlag flags)
    01530 {
    01531   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER)
    01532     return CMD_ERROR;
    01533
    01534   if (!EnsureNoVehicleOnGround(tile))
    01535     return CMD_ERROR;
    01536
    01537   if (flags & DC_EXEC) {
    01538     /* read variables before the depot is removed */
    01539     DiagDirection dir = GetRailDepotDirection(tile);
    01540     Owner owner = GetTileOwner(tile);
    01541     Train *v = NULL;
    01542
    01543     if (HasDepotReservation(tile)) {
    01544       v = GetTrainForReservation(tile, DiagDirToDiagTrack(dir));
    01545       if (v != NULL) FreeTrainTrackReservation(v);
    01546     }
    01547
    01548     delete Depot::GetByTile(tile);
    01549     DoClearSquare(tile);
    01550     AddSideToSignalBuffer(tile, dir, owner);
    01551     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
    01552     if (v != NULL) TryPathReserve(v, true);
    01553   }
    01554
    01555   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_TRAIN]);
    01556 }
    01557
    01558 static CommandCost ClearTile_Track(TileIndex tile, DoCommandFlag flags)
    01559 {
    01560   CommandCost cost(EXPENSES_CONSTRUCTION);
    01561
    01562   if (flags & DC_AUTO) {
    01563     if (!IsTileOwner(tile, _current_company)) {
    01564       return_cmd_error(STR_ERROR_AREA_IS_OWNED_BY_ANOTHER);
    01565     }
    01566
    01567     if (IsPlainRail(tile)) {
    01568       return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
    01569     } else {
    01570       return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
    01571     }
    01572   }
    01573
    01574   switch (GetRailTileType(tile)) {
    01575     case RAIL_TILE_SIGNALS:
    01576     case RAIL_TILE_NORMAL: {
    01577       Slope tileh = GetTileSlope(tile, NULL);
    01578       /* Is there flat water on the lower halftile, that gets cleared expensively? */
    01579       bool water_ground = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh));
    01580
    01581       TrackBits tracks = GetTrackBits(tile);
    01582       while (tracks != TRACK_BIT_NONE) {
    01583         Track track = RemoveFirstTrack(&tracks);
    01584         CommandCost ret = DoCommand(tile, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
    01585         if (ret.Failed()) return CMD_ERROR;
    01586         cost.AddCost(ret);
    01587       }
    01588
    01589       /* when bankrupting, don't make water dirty, there could be a ship on lower halftile */
    01590       if (water_ground && !(flags & DC_BANKRUPT)) {
    01591         if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    01592
    01593         /* The track was removed, and left a coast tile. Now also clear the water. */
    01594         if (flags & DC_EXEC) DoClearSquare(tile);
    01595         cost.AddCost(_price[PR_CLEAR_WATER]);
    01596       }
    01597
    01598       return cost;
    01599     }
    01600
    01601     case RAIL_TILE_DEPOT:
    01602       return RemoveTrainDepot(tile, flags);
    01603
    01604     default:
    01605       return CMD_ERROR;
    01606   }
    01607 }
    01608
    01613 static uint GetSaveSlopeZ(uint x, uint y, Track track)
    01614 {
    01615   switch (track) {
    01616     case TRACK_UPPER: x &= ~0xF; y &= ~0xF; break;
    01617     case TRACK_LOWER: x |=  0xF; y |=  0xF; break;
    01618     case TRACK_LEFT:  x |=  0xF; y &= ~0xF; break;
    01619     case TRACK_RIGHT: x &= ~0xF; y |=  0xF; break;
    01620     default: break;
    01621   }
    01622   return GetSlopeZ(x, y);
    01623 }
    01624
    01625 static void DrawSingleSignal(TileIndex tile, Track track, byte condition, uint image, uint pos)
    01626 {
    01627   bool side = (_settings_game.vehicle.road_side != 0) && _settings_game.construction.signal_side;
    01628   static const Point SignalPositions[2][12] = {
    01629     { // Signals on the left side
    01630     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01631       { 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
    01632     /*  LOWER     LOWER     X         X         Y         Y     */
    01633       {11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
    01634     }, { // Signals on the right side
    01635     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01636       {14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
    01637     /*  LOWER     LOWER     X         X         Y         Y     */
    01638       {14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
    01639     }
    01640   };
    01641
    01642   uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
    01643   uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
    01644
    01645   SpriteID sprite;
    01646
    01647   SignalType type       = GetSignalType(tile, track);
    01648   SignalVariant variant = GetSignalVariant(tile, track);
    01649
    01650   if (type == SIGTYPE_NORMAL && variant == SIG_ELECTRIC) {
    01651     /* Normal electric signals are picked from original sprites. */
    01652     sprite = SPR_ORIGINAL_SIGNALS_BASE + image + condition;
    01653   } else {
    01654     /* All other signals are picked from add on sprites. */
    01655     sprite = SPR_SIGNALS_BASE + (type - 1) * 16 + variant * 64 + image + condition + (type > SIGTYPE_LAST_NOPBS ? 64 : 0);
    01656   }
    01657
    01658   AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, GetSaveSlopeZ(x, y, track));
    01659 }
    01660
    01661 static uint32 _drawtile_track_palette;
    01662
    01663
    01664 static void DrawTrackFence_NW(const TileInfo *ti, SpriteID base_image)
    01665 {
    01666   RailFenceOffset rfo = RFO_FLAT_X;
    01667   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
    01668   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01669     ti->x, ti->y + 1, 16, 1, 4, ti->z);
    01670 }
    01671
    01672 static void DrawTrackFence_SE(const TileInfo *ti, SpriteID base_image)
    01673 {
    01674   RailFenceOffset rfo = RFO_FLAT_X;
    01675   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
    01676   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01677     ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
    01678 }
    01679
    01680 static void DrawTrackFence_NW_SE(const TileInfo *ti, SpriteID base_image)
    01681 {
    01682   DrawTrackFence_NW(ti, base_image);
    01683   DrawTrackFence_SE(ti, base_image);
    01684 }
    01685
    01686 static void DrawTrackFence_NE(const TileInfo *ti, SpriteID base_image)
    01687 {
    01688   RailFenceOffset rfo = RFO_FLAT_Y;
    01689   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
    01690   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01691     ti->x + 1, ti->y, 1, 16, 4, ti->z);
    01692 }
    01693
    01694 static void DrawTrackFence_SW(const TileInfo *ti, SpriteID base_image)
    01695 {
    01696   RailFenceOffset rfo = RFO_FLAT_Y;
    01697   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
    01698   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01699     ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
    01700 }
    01701
    01702 static void DrawTrackFence_NE_SW(const TileInfo *ti, SpriteID base_image)
    01703 {
    01704   DrawTrackFence_NE(ti, base_image);
    01705   DrawTrackFence_SW(ti, base_image);
    01706 }
    01707
    01711 static void DrawTrackFence_NS_1(const TileInfo *ti, SpriteID base_image)
    01712 {
    01713   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_W);
    01714   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
    01715     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01716 }
    01717
    01721 static void DrawTrackFence_NS_2(const TileInfo *ti, SpriteID base_image)
    01722 {
    01723   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_E);
    01724   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
    01725     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01726 }
    01727
    01731 static void DrawTrackFence_WE_1(const TileInfo *ti, SpriteID base_image)
    01732 {
    01733   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_N);
    01734   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
    01735     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01736 }
    01737
    01741 static void DrawTrackFence_WE_2(const TileInfo *ti, SpriteID base_image)
    01742 {
    01743   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_S);
    01744   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
    01745     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01746 }
    01747
    01748
    01749 static void DrawTrackDetails(const TileInfo *ti, const RailtypeInfo *rti)
    01750 {
    01751   /* Base sprite for track fences. */
    01752   SpriteID base_image = GetCustomRailSprite(rti, ti->tile, RTSG_FENCES);
    01753   if (base_image == 0) base_image = SPR_TRACK_FENCE_FLAT_X;
    01754
    01755   switch (GetRailGroundType(ti->tile)) {
    01756     case RAIL_GROUND_FENCE_NW:     DrawTrackFence_NW(ti, base_image);    break;
    01757     case RAIL_GROUND_FENCE_SE:     DrawTrackFence_SE(ti, base_image);    break;
    01758     case RAIL_GROUND_FENCE_SENW:   DrawTrackFence_NW_SE(ti, base_image); break;
    01759     case RAIL_GROUND_FENCE_NE:     DrawTrackFence_NE(ti, base_image);    break;
    01760     case RAIL_GROUND_FENCE_SW:     DrawTrackFence_SW(ti, base_image);    break;
    01761     case RAIL_GROUND_FENCE_NESW:   DrawTrackFence_NE_SW(ti, base_image); break;
    01762     case RAIL_GROUND_FENCE_VERT1:  DrawTrackFence_NS_1(ti, base_image);  break;
    01763     case RAIL_GROUND_FENCE_VERT2:  DrawTrackFence_NS_2(ti, base_image);  break;
    01764     case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti, base_image);  break;
    01765     case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti, base_image);  break;
    01766     case RAIL_GROUND_WATER: {
    01767       Corner track_corner;
    01768       if (IsHalftileSlope(ti->tileh)) {
    01769         /* Steep slope or one-corner-raised slope with halftile foundation */
    01770         track_corner = GetHalftileSlopeCorner(ti->tileh);
    01771       } else {
    01772         /* Three-corner-raised slope */
    01773         track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    01774       }
    01775       switch (track_corner) {
    01776         case CORNER_W: DrawTrackFence_NS_1(ti, base_image); break;
    01777         case CORNER_S: DrawTrackFence_WE_2(ti, base_image); break;
    01778         case CORNER_E: DrawTrackFence_NS_2(ti, base_image); break;
    01779         case CORNER_N: DrawTrackFence_WE_1(ti, base_image); break;
    01780         default: NOT_REACHED();
    01781       }
    01782       break;
    01783     }
    01784     default: break;
    01785   }
    01786 }
    01787
    01788 /* SubSprite for drawing the track halftile of 'three-corners-raised'-sloped rail sprites. */
    01789 static const int INF = 1000; // big number compared to tilesprite size
    01790 static const SubSprite _halftile_sub_sprite[4] = {
    01791   { -INF    , -INF  , 32 - 33, INF     }, // CORNER_W, clip 33 pixels from right
    01792   { -INF    ,  0 + 7, INF    , INF     }, // CORNER_S, clip 7 pixels from top
    01793   { -31 + 33, -INF  , INF    , INF     }, // CORNER_E, clip 33 pixels from left
    01794   { -INF    , -INF  , INF    , 30 - 23 }  // CORNER_N, clip 23 pixels from bottom
    01795 };
    01796
    01797 static inline void DrawTrackSprite(SpriteID sprite, PaletteID pal, const TileInfo *ti, Slope s)
    01798 {
    01799   DrawGroundSprite(sprite, pal, NULL, 0, (ti->tileh & s) ? -8 : 0);
    01800 }
    01801
    01802 static void DrawTrackBitsOverlay(TileInfo *ti, TrackBits track, const RailtypeInfo *rti)
    01803 {
    01804   RailGroundType rgt = GetRailGroundType(ti->tile);
    01805   Foundation f = GetRailFoundation(ti->tileh, track);
    01806   Corner halftile_corner = CORNER_INVALID;
    01807
    01808   if (IsNonContinuousFoundation(f)) {
    01809     /* Save halftile corner */
    01810     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
    01811     /* Draw lower part first */
    01812     track &= ~CornerToTrackBits(halftile_corner);
    01813     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
    01814   }
    01815
    01816   DrawFoundation(ti, f);
    01817   /* DrawFoundation modifies ti */
    01818
    01819   /* Draw ground */
    01820   if (track == TRACK_BIT_NONE && rgt == RAIL_GROUND_WATER) {
    01821     if (IsSteepSlope(ti->tileh)) {
    01822       DrawShoreTile(ti->tileh);
    01823     } else {
    01824       DrawGroundSprite(SPR_FLAT_WATER_TILE, PAL_NONE);
    01825     }
    01826   } else {
    01827     SpriteID image;
    01828
    01829     switch (rgt) {
    01830       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01831       case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
    01832       default:                     image = SPR_FLAT_GRASS_TILE; break;
    01833     }
    01834
    01835     image += _tileh_to_sprite[ti->tileh];
    01836
    01837     DrawGroundSprite(image, PAL_NONE);
    01838   }
    01839
    01840   SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
    01841   SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
    01842   TrackBits pbs = _settings_client.gui.show_track_reservation ? GetRailReservationTrackBits(ti->tile) : TRACK_BIT_NONE;
    01843
    01844   if (track == TRACK_BIT_NONE) {
    01845     /* Half-tile foundation, no track here? */
    01846   } else if (ti->tileh == SLOPE_NW && track == TRACK_BIT_Y) {
    01847     DrawGroundSprite(ground + RTO_SLOPE_NW, PAL_NONE);
    01848     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 9, PALETTE_CRASH);
    01849   } else if (ti->tileh == SLOPE_NE && track == TRACK_BIT_X) {
    01850     DrawGroundSprite(ground + RTO_SLOPE_NE, PAL_NONE);
    01851     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 6, PALETTE_CRASH);
    01852   } else if (ti->tileh == SLOPE_SE && track == TRACK_BIT_Y) {
    01853     DrawGroundSprite(ground + RTO_SLOPE_SE, PAL_NONE);
    01854     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 7, PALETTE_CRASH);
    01855   } else if (ti->tileh == SLOPE_SW && track == TRACK_BIT_X) {
    01856     DrawGroundSprite(ground + RTO_SLOPE_SW, PAL_NONE);
    01857     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 8, PALETTE_CRASH);
    01858   } else {
    01859     switch (track) {
    01860       /* Draw single ground sprite when not overlapping. No track overlay
    01861        * is necessary for these sprites. */
    01862       case TRACK_BIT_X:     DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
    01863       case TRACK_BIT_Y:     DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
    01864       case TRACK_BIT_UPPER: DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N); break;
    01865       case TRACK_BIT_LOWER: DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
    01866       case TRACK_BIT_RIGHT: DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E); break;
    01867       case TRACK_BIT_LEFT:  DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
    01868       case TRACK_BIT_CROSS: DrawGroundSprite(ground + RTO_CROSSING_XY, PAL_NONE); break;
    01869       case TRACK_BIT_HORZ:  DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N);
    01870                             DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
    01871       case TRACK_BIT_VERT:  DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E);
    01872                             DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
    01873
    01874       default:
    01875         /* We're drawing a junction tile */
    01876         if ((track & TRACK_BIT_3WAY_NE) == 0) {
    01877           DrawGroundSprite(ground + RTO_JUNCTION_SW, PAL_NONE);
    01878         } else if ((track & TRACK_BIT_3WAY_SW) == 0) {
    01879           DrawGroundSprite(ground + RTO_JUNCTION_NE, PAL_NONE);
    01880         } else if ((track & TRACK_BIT_3WAY_NW) == 0) {
    01881           DrawGroundSprite(ground + RTO_JUNCTION_SE, PAL_NONE);
    01882         } else if ((track & TRACK_BIT_3WAY_SE) == 0) {
    01883           DrawGroundSprite(ground + RTO_JUNCTION_NW, PAL_NONE);
    01884         } else {
    01885           DrawGroundSprite(ground + RTO_JUNCTION_NSEW, PAL_NONE);
    01886         }
    01887
    01888         /* Mask out PBS bits as we shall draw them afterwards anyway. */
    01889         track &= ~pbs;
    01890
    01891         /* Draw regular track bits */
    01892         if (track & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PAL_NONE);
    01893         if (track & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PAL_NONE);
    01894         if (track & TRACK_BIT_UPPER) DrawGroundSprite(overlay + RTO_N, PAL_NONE);
    01895         if (track & TRACK_BIT_LOWER) DrawGroundSprite(overlay + RTO_S, PAL_NONE);
    01896         if (track & TRACK_BIT_RIGHT) DrawGroundSprite(overlay + RTO_E, PAL_NONE);
    01897         if (track & TRACK_BIT_LEFT)  DrawGroundSprite(overlay + RTO_W, PAL_NONE);
    01898     }
    01899
    01900     /* Draw reserved track bits */
    01901     if (pbs & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH);
    01902     if (pbs & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH);
    01903     if (pbs & TRACK_BIT_UPPER) DrawTrackSprite(overlay + RTO_N, PALETTE_CRASH, ti, SLOPE_N);
    01904     if (pbs & TRACK_BIT_LOWER) DrawTrackSprite(overlay + RTO_S, PALETTE_CRASH, ti, SLOPE_S);
    01905     if (pbs & TRACK_BIT_RIGHT) DrawTrackSprite(overlay + RTO_E, PALETTE_CRASH, ti, SLOPE_E);
    01906     if (pbs & TRACK_BIT_LEFT)  DrawTrackSprite(overlay + RTO_W, PALETTE_CRASH, ti, SLOPE_W);
    01907   }
    01908
    01909   if (IsValidCorner(halftile_corner)) {
    01910     DrawFoundation(ti, HalftileFoundation(halftile_corner));
    01911
    01912     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
    01913     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    01914
    01915     SpriteID image;
    01916     switch (rgt) {
    01917       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01918       case RAIL_GROUND_ICE_DESERT:
    01919       case RAIL_GROUND_HALF_SNOW:  image = SPR_FLAT_SNOW_DESERT_TILE; break;
    01920       default:                     image = SPR_FLAT_GRASS_TILE; break;
    01921     }
    01922
    01923     image += _tileh_to_sprite[fake_slope];
    01924
    01925     DrawGroundSprite(image, PAL_NONE, &(_halftile_sub_sprite[halftile_corner]));
    01926
    01927     track = CornerToTrackBits(halftile_corner);
    01928
    01929     int offset;
    01930     switch (track) {
    01931       default: NOT_REACHED();
    01932       case TRACK_BIT_UPPER: offset = RTO_N; break;
    01933       case TRACK_BIT_LOWER: offset = RTO_S; break;
    01934       case TRACK_BIT_RIGHT: offset = RTO_E; break;
    01935       case TRACK_BIT_LEFT:  offset = RTO_W; break;
    01936     }
    01937
    01938     DrawTrackSprite(ground + offset, PAL_NONE, ti, fake_slope);
    01939     if (HasReservedTracks(ti->tile, track)) {
    01940       DrawTrackSprite(overlay + offset, PALETTE_CRASH, ti, fake_slope);
    01941     }
    01942   }
    01943 }
    01944
    01950 static void DrawTrackBits(TileInfo *ti, TrackBits track)
    01951 {
    01952   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    01953
    01954   if (rti->UsesOverlay()) {
    01955     DrawTrackBitsOverlay(ti, track, rti);
    01956     return;
    01957   }
    01958
    01959   RailGroundType rgt = GetRailGroundType(ti->tile);
    01960   Foundation f = GetRailFoundation(ti->tileh, track);
    01961   Corner halftile_corner = CORNER_INVALID;
    01962
    01963   if (IsNonContinuousFoundation(f)) {
    01964     /* Save halftile corner */
    01965     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
    01966     /* Draw lower part first */
    01967     track &= ~CornerToTrackBits(halftile_corner);
    01968     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
    01969   }
    01970
    01971   DrawFoundation(ti, f);
    01972   /* DrawFoundation modifies ti */
    01973
    01974   SpriteID image;
    01975   PaletteID pal = PAL_NONE;
    01976   const SubSprite *sub = NULL;
    01977   bool junction = false;
    01978
    01979   /* Select the sprite to use. */
    01980   if (track == 0) {
    01981     /* Clear ground (only track on halftile foundation) */
    01982     if (rgt == RAIL_GROUND_WATER) {
    01983       if (IsSteepSlope(ti->tileh)) {
    01984         DrawShoreTile(ti->tileh);
    01985         image = 0;
    01986       } else {
    01987         image = SPR_FLAT_WATER_TILE;
    01988       }
    01989     } else {
    01990       switch (rgt) {
    01991         case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01992         case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
    01993         default:                     image = SPR_FLAT_GRASS_TILE; break;
    01994       }
    01995       image += _tileh_to_sprite[ti->tileh];
    01996     }
    01997   } else {
    01998     if (ti->tileh != SLOPE_FLAT) {
    01999       /* track on non-flat ground */
    02000       image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
    02001     } else {
    02002       /* track on flat ground */
    02003       (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
    02004       (image++,                           track == TRACK_BIT_X) ||
    02005       (image++,                           track == TRACK_BIT_UPPER) ||
    02006       (image++,                           track == TRACK_BIT_LOWER) ||
    02007       (image++,                           track == TRACK_BIT_RIGHT) ||
    02008       (image++,                           track == TRACK_BIT_LEFT) ||
    02009       (image++,                           track == TRACK_BIT_CROSS) ||
    02010
    02011       (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
    02012       (image++,                            track == TRACK_BIT_VERT) ||
    02013
    02014       (junction = true, false) ||
    02015       (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
    02016       (image++,                          (track & TRACK_BIT_3WAY_SW) == 0) ||
    02017       (image++,                          (track & TRACK_BIT_3WAY_NW) == 0) ||
    02018       (image++,                          (track & TRACK_BIT_3WAY_SE) == 0) ||
    02019       (image++, true);
    02020     }
    02021
    02022     switch (rgt) {
    02023       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    02024       case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset;  break;
    02025       case RAIL_GROUND_WATER: {
    02026         /* three-corner-raised slope */
    02027         DrawShoreTile(ti->tileh);
    02028         Corner track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    02029         sub = &(_halftile_sub_sprite[track_corner]);
    02030         break;
    02031       }
    02032       default: break;
    02033     }
    02034   }
    02035
    02036   if (image != 0) DrawGroundSprite(image, pal, sub);
    02037
    02038   /* Draw track pieces individually for junction tiles */
    02039   if (junction) {
    02040     if (track & TRACK_BIT_X)     DrawGroundSprite(rti->base_sprites.single_x, PAL_NONE);
    02041     if (track & TRACK_BIT_Y)     DrawGroundSprite(rti->base_sprites.single_y, PAL_NONE);
    02042     if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PAL_NONE);
    02043     if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PAL_NONE);
    02044     if (track & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PAL_NONE);
    02045     if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PAL_NONE);
    02046   }
    02047
    02048   /* PBS debugging, draw reserved tracks darker */
    02049   if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation) {
    02050     /* Get reservation, but mask track on halftile slope */
    02051     TrackBits pbs = GetRailReservationTrackBits(ti->tile) & track;
    02052     if (pbs & TRACK_BIT_X) {
    02053       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
    02054         DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH);
    02055       } else {
    02056         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
    02057       }
    02058     }
    02059     if (pbs & TRACK_BIT_Y) {
    02060       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
    02061         DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH);
    02062       } else {
    02063         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
    02064       }
    02065     }
    02066     if (pbs & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_N ? -TILE_HEIGHT : 0);
    02067     if (pbs & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_S ? -TILE_HEIGHT : 0);
    02068     if (pbs & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_W ? -TILE_HEIGHT : 0);
    02069     if (pbs & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_E ? -TILE_HEIGHT : 0);
    02070   }
    02071
    02072   if (IsValidCorner(halftile_corner)) {
    02073     DrawFoundation(ti, HalftileFoundation(halftile_corner));
    02074
    02075     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
    02076     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    02077     image = _track_sloped_sprites[fake_slope - 1] + rti->base_sprites.track_y;
    02078     pal = PAL_NONE;
    02079     switch (rgt) {
    02080       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    02081       case RAIL_GROUND_ICE_DESERT:
    02082       case RAIL_GROUND_HALF_SNOW:  image += rti->snow_offset;  break; // higher part has snow in this case too
    02083       default: break;
    02084     }
    02085     DrawGroundSprite(image, pal, &(_halftile_sub_sprite[halftile_corner]));
    02086
    02087     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, CornerToTrackBits(halftile_corner))) {
    02088       static const byte _corner_to_track_sprite[] = {3, 1, 2, 0};
    02089       DrawGroundSprite(_corner_to_track_sprite[halftile_corner] + rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, -TILE_HEIGHT);
    02090     }
    02091   }
    02092 }
    02093
    02099 enum {
    02100   SIGNAL_TO_SOUTHWEST =  0,
    02101   SIGNAL_TO_NORTHEAST =  2,
    02102   SIGNAL_TO_SOUTHEAST =  4,
    02103   SIGNAL_TO_NORTHWEST =  6,
    02104   SIGNAL_TO_EAST      =  8,
    02105   SIGNAL_TO_WEST      = 10,
    02106   SIGNAL_TO_SOUTH     = 12,
    02107   SIGNAL_TO_NORTH     = 14,
    02108 };
    02109
    02110 static void DrawSignals(TileIndex tile, TrackBits rails)
    02111 {
    02112 #define MAYBE_DRAW_SIGNAL(x, y, z, t) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, t, GetSingleSignalState(tile, x), y, z)
    02113
    02114   if (!(rails & TRACK_BIT_Y)) {
    02115     if (!(rails & TRACK_BIT_X)) {
    02116       if (rails & TRACK_BIT_LEFT) {
    02117         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTH, 0, TRACK_LEFT);
    02118         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTH, 1, TRACK_LEFT);
    02119       }
    02120       if (rails & TRACK_BIT_RIGHT) {
    02121         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_NORTH, 2, TRACK_RIGHT);
    02122         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_SOUTH, 3, TRACK_RIGHT);
    02123       }
    02124       if (rails & TRACK_BIT_UPPER) {
    02125         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_WEST, 4, TRACK_UPPER);
    02126         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_EAST, 5, TRACK_UPPER);
    02127       }
    02128       if (rails & TRACK_BIT_LOWER) {
    02129         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_WEST, 6, TRACK_LOWER);
    02130         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_EAST, 7, TRACK_LOWER);
    02131       }
    02132     } else {
    02133       MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHWEST, 8, TRACK_X);
    02134       MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHEAST, 9, TRACK_X);
    02135     }
    02136   } else {
    02137     MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHEAST, 10, TRACK_Y);
    02138     MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHWEST, 11, TRACK_Y);
    02139   }
    02140 }
    02141
    02142 static void DrawTile_Track(TileInfo *ti)
    02143 {
    02144   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    02145
    02146   _drawtile_track_palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
    02147
    02148   if (IsPlainRail(ti->tile)) {
    02149     TrackBits rails = GetTrackBits(ti->tile);
    02150
    02151     DrawTrackBits(ti, rails);
    02152
    02153     if (HasBit(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti, rti);
    02154
    02155     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    02156
    02157     if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
    02158   } else {
    02159     /* draw depot */
    02160     const DrawTileSprites *dts;
    02161     PaletteID pal = PAL_NONE;
    02162     SpriteID relocation;
    02163
    02164     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
    02165
    02166     if (IsInvisibilitySet(TO_BUILDINGS)) {
    02167       /* Draw rail instead of depot */
    02168       dts = &_depot_invisible_gfx_table[GetRailDepotDirection(ti->tile)];
    02169     } else {
    02170       dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
    02171     }
    02172
    02173     SpriteID image;
    02174     if (rti->UsesOverlay()) {
    02175       image = SPR_FLAT_GRASS_TILE;
    02176     } else {
    02177       image = dts->ground.sprite;
    02178       if (image != SPR_FLAT_GRASS_TILE) image += rti->total_offset;
    02179     }
    02180
    02181     /* adjust ground tile for desert
    02182      * don't adjust for snow, because snow in depots looks weird */
    02183     if (IsSnowRailGround(ti->tile) && _settings_game.game_creation.landscape == LT_TROPIC) {
    02184       if (image != SPR_FLAT_GRASS_TILE) {
    02185         image += rti->snow_offset; // tile with tracks
    02186       } else {
    02187         image = SPR_FLAT_SNOW_DESERT_TILE; // flat ground
    02188       }
    02189     }
    02190
    02191     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, _drawtile_track_palette));
    02192
    02193     if (rti->UsesOverlay()) {
    02194       SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
    02195
    02196       switch (GetRailDepotDirection(ti->tile)) {
    02197         case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02198         case DIAGDIR_SW: DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
    02199         case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02200         case DIAGDIR_SE: DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
    02201         default: break;
    02202       }
    02203
    02204       if (_settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
    02205         SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
    02206
    02207         switch (GetRailDepotDirection(ti->tile)) {
    02208           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02209           case DIAGDIR_SW: DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH); break;
    02210           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02211           case DIAGDIR_SE: DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH); break;
    02212           default: break;
    02213         }
    02214       }
    02215
    02216       relocation  = GetCustomRailSprite(rti, ti->tile, RTSG_DEPOT);
    02217       relocation -= SPR_RAIL_DEPOT_SE_1;
    02218     } else {
    02219       /* PBS debugging, draw reserved tracks darker */
    02220       if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
    02221         switch (GetRailDepotDirection(ti->tile)) {
    02222           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02223           case DIAGDIR_SW: DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH); break;
    02224           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02225           case DIAGDIR_SE: DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH); break;
    02226           default: break;
    02227         }
    02228       }
    02229
    02230       relocation = rti->total_offset;
    02231     }
    02232
    02233     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    02234
    02235     DrawRailTileSeq(ti, dts, TO_BUILDINGS, relocation, 0, _drawtile_track_palette);
    02236   }
    02237   DrawBridgeMiddle(ti);
    02238 }
    02239
    02240 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
    02241 {
    02242   const DrawTileSprites *dts = &_depot_gfx_table[dir];
    02243   const RailtypeInfo *rti = GetRailTypeInfo(railtype);
    02244   SpriteID image = rti->UsesOverlay() ? SPR_FLAT_GRASS_TILE : dts->ground.sprite;
    02245   uint32 offset = rti->total_offset;
    02246
    02247   x += 33;
    02248   y += 17;
    02249
    02250   if (image != SPR_FLAT_GRASS_TILE) image += offset;
    02251   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
    02252
    02253   DrawSprite(image, PAL_NONE, x, y);
    02254
    02255   if (rti->UsesOverlay()) {
    02256     SpriteID ground = GetCustomRailSprite(rti, INVALID_TILE, RTSG_GROUND);
    02257
    02258     switch (dir) {
    02259       case DIAGDIR_SW: DrawSprite(ground + RTO_X, PAL_NONE, x, y); break;
    02260       case DIAGDIR_SE: DrawSprite(ground + RTO_Y, PAL_NONE, x, y); break;
    02261       default: break;
    02262     }
    02263
    02264     offset  = GetCustomRailSprite(rti, INVALID_TILE, RTSG_DEPOT);
    02265     offset -= SPR_RAIL_DEPOT_SE_1;
    02266   }
    02267
    02268   DrawRailTileSeqInGUI(x, y, dts, offset, 0, palette);
    02269 }
    02270
    02271 static uint GetSlopeZ_Track(TileIndex tile, uint x, uint y)
    02272 {
    02273   uint z;
    02274   Slope tileh = GetTileSlope(tile, &z);
    02275
    02276   if (tileh == SLOPE_FLAT) return z;
    02277   if (IsPlainRail(tile)) {
    02278     z += ApplyFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
    02279     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
    02280   } else {
    02281     return z + TILE_HEIGHT;
    02282   }
    02283 }
    02284
    02285 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
    02286 {
    02287   return IsPlainRail(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
    02288 }
    02289
    02290 static void TileLoop_Track(TileIndex tile)
    02291 {
    02292   RailGroundType old_ground = GetRailGroundType(tile);
    02293   RailGroundType new_ground;
    02294
    02295   if (old_ground == RAIL_GROUND_WATER) {
    02296     TileLoop_Water(tile);
    02297     return;
    02298   }
    02299
    02300   switch (_settings_game.game_creation.landscape) {
    02301     case LT_ARCTIC: {
    02302       uint z;
    02303       Slope slope = GetTileSlope(tile, &z);
    02304       bool half = false;
    02305
    02306       /* for non-flat track, use lower part of track
    02307        * in other cases, use the highest part with track */
    02308       if (IsPlainRail(tile)) {
    02309         TrackBits track = GetTrackBits(tile);
    02310         Foundation f = GetRailFoundation(slope, track);
    02311
    02312         switch (f) {
    02313           case FOUNDATION_NONE:
    02314             /* no foundation - is the track on the upper side of three corners raised tile? */
    02315             if (IsSlopeWithThreeCornersRaised(slope)) z += TILE_HEIGHT;
    02316             break;
    02317
    02318           case FOUNDATION_INCLINED_X:
    02319           case FOUNDATION_INCLINED_Y:
    02320             /* sloped track - is it on a steep slope? */
    02321             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    02322             break;
    02323
    02324           case FOUNDATION_STEEP_LOWER:
    02325             /* only lower part of steep slope */
    02326             z += TILE_HEIGHT;
    02327             break;
    02328
    02329           default:
    02330             /* if it is a steep slope, then there is a track on higher part */
    02331             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    02332             z += TILE_HEIGHT;
    02333             break;
    02334         }
    02335
    02336         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
    02337       } else {
    02338         /* is the depot on a non-flat tile? */
    02339         if (slope != SLOPE_FLAT) z += TILE_HEIGHT;
    02340       }
    02341
    02342       /* 'z' is now the lowest part of the highest track bit -
    02343        * for sloped track, it is 'z' of lower part
    02344        * for two track bits, it is 'z' of higher track bit
    02345        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
    02346       if (z > GetSnowLine()) {
    02347         if (half && z - GetSnowLine() == TILE_HEIGHT) {
    02348           /* track on non-continuous foundation, lower part is not under snow */
    02349           new_ground = RAIL_GROUND_HALF_SNOW;
    02350         } else {
    02351           new_ground = RAIL_GROUND_ICE_DESERT;
    02352         }
    02353         goto set_ground;
    02354       }
    02355       break;
    02356       }
    02357
    02358     case LT_TROPIC:
    02359       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
    02360         new_ground = RAIL_GROUND_ICE_DESERT;
    02361         goto set_ground;
    02362       }
    02363       break;
    02364   }
    02365
    02366   if (!IsPlainRail(tile)) return;
    02367
    02368   new_ground = RAIL_GROUND_GRASS;
    02369
    02370   if (old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
    02371     /* determine direction of fence */
    02372     TrackBits rail = GetTrackBits(tile);
    02373
    02374     switch (rail) {
    02375       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
    02376       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
    02377       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
    02378       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
    02379
    02380       default: {
    02381         Owner owner = GetTileOwner(tile);
    02382
    02383         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
    02384               (rail & TRACK_BIT_3WAY_NW) == 0 &&
    02385               (rail & TRACK_BIT_X)
    02386             )) {
    02387           TileIndex n = tile + TileDiffXY(0, -1);
    02388           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02389
    02390           if (!IsTileType(n, MP_RAILWAY) ||
    02391               !IsTileOwner(n, owner) ||
    02392               nrail == TRACK_BIT_UPPER ||
    02393               nrail == TRACK_BIT_LEFT) {
    02394             new_ground = RAIL_GROUND_FENCE_NW;
    02395           }
    02396         }
    02397
    02398         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
    02399               (rail & TRACK_BIT_3WAY_SE) == 0 &&
    02400               (rail & TRACK_BIT_X)
    02401             )) {
    02402           TileIndex n = tile + TileDiffXY(0, 1);
    02403           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02404
    02405           if (!IsTileType(n, MP_RAILWAY) ||
    02406               !IsTileOwner(n, owner) ||
    02407               nrail == TRACK_BIT_LOWER ||
    02408               nrail == TRACK_BIT_RIGHT) {
    02409             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
    02410               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
    02411           }
    02412         }
    02413
    02414         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
    02415               (rail & TRACK_BIT_3WAY_NE) == 0 &&
    02416               (rail & TRACK_BIT_Y)
    02417             )) {
    02418           TileIndex n = tile + TileDiffXY(-1, 0);
    02419           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02420
    02421           if (!IsTileType(n, MP_RAILWAY) ||
    02422               !IsTileOwner(n, owner) ||
    02423               nrail == TRACK_BIT_UPPER ||
    02424               nrail == TRACK_BIT_RIGHT) {
    02425             new_ground = RAIL_GROUND_FENCE_NE;
    02426           }
    02427         }
    02428
    02429         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
    02430               (rail & TRACK_BIT_3WAY_SW) == 0 &&
    02431               (rail & TRACK_BIT_Y)
    02432             )) {
    02433           TileIndex n = tile + TileDiffXY(1, 0);
    02434           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02435
    02436           if (!IsTileType(n, MP_RAILWAY) ||
    02437               !IsTileOwner(n, owner) ||
    02438               nrail == TRACK_BIT_LOWER ||
    02439               nrail == TRACK_BIT_LEFT) {
    02440             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
    02441               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
    02442           }
    02443         }
    02444         break;
    02445       }
    02446     }
    02447   }
    02448
    02449 set_ground:
    02450   if (old_ground != new_ground) {
    02451     SetRailGroundType(tile, new_ground);
    02452     MarkTileDirtyByTile(tile);
    02453   }
    02454 }
    02455
    02456
    02457 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
    02458 {
    02459   /* Case of half tile slope with water. */
    02460   if (mode == TRANSPORT_WATER && IsPlainRail(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
    02461     TrackBits tb = GetTrackBits(tile);
    02462     switch (tb) {
    02463       default: NOT_REACHED();
    02464       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
    02465       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
    02466       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
    02467       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
    02468     }
    02469     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
    02470   }
    02471
    02472   if (mode != TRANSPORT_RAIL) return 0;
    02473
    02474   TrackBits trackbits = TRACK_BIT_NONE;
    02475   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
    02476
    02477   switch (GetRailTileType(tile)) {
    02478     default: NOT_REACHED();
    02479     case RAIL_TILE_NORMAL:
    02480       trackbits = GetTrackBits(tile);
    02481       break;
    02482
    02483     case RAIL_TILE_SIGNALS: {
    02484       trackbits = GetTrackBits(tile);
    02485       byte a = GetPresentSignals(tile);
    02486       uint b = GetSignalStates(tile);
    02487
    02488       b &= a;
    02489
    02490       /* When signals are not present (in neither direction),
    02491        * we pretend them to be green. Otherwise, it depends on
    02492        * the signal type. For signals that are only active from
    02493        * one side, we set the missing signals explicitely to
    02494        * `green'. Otherwise, they implicitely become `red'. */
    02495       if (!IsOnewaySignal(tile, TRACK_UPPER) || (a & SignalOnTrack(TRACK_UPPER)) == 0) b |= ~a & SignalOnTrack(TRACK_UPPER);
    02496       if (!IsOnewaySignal(tile, TRACK_LOWER) || (a & SignalOnTrack(TRACK_LOWER)) == 0) b |= ~a & SignalOnTrack(TRACK_LOWER);
    02497
    02498       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
    02499       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
    02500       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
    02501       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
    02502
    02503       break;
    02504     }
    02505
    02506     case RAIL_TILE_DEPOT: {
    02507       DiagDirection dir = GetRailDepotDirection(tile);
    02508
    02509       if (side != INVALID_DIAGDIR && side != dir) break;
    02510
    02511       trackbits = DiagDirToDiagTrackBits(dir);
    02512       break;
    02513     }
    02514   }
    02515
    02516   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
    02517 }
    02518
    02519 static bool ClickTile_Track(TileIndex tile)
    02520 {
    02521   if (!IsRailDepot(tile)) return false;
    02522
    02523   ShowDepotWindow(tile, VEH_TRAIN);
    02524   return true;
    02525 }
    02526
    02527 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
    02528 {
    02529   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
    02530   td->rail_speed = rti->max_speed;
    02531   td->owner[0] = GetTileOwner(tile);
    02532   switch (GetRailTileType(tile)) {
    02533     case RAIL_TILE_NORMAL:
    02534       td->str = STR_LAI_RAIL_DESCRIPTION_TRACK;
    02535       break;
    02536
    02537     case RAIL_TILE_SIGNALS: {
    02538       static const StringID signal_type[6][6] = {
    02539         {
    02540           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_SIGNALS,
    02541           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
    02542           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
    02543           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02544           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
    02545           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS
    02546         },
    02547         {
    02548           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
    02549           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRESIGNALS,
    02550           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
    02551           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
    02552           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
    02553           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS
    02554         },
    02555         {
    02556           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
    02557           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
    02558           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXITSIGNALS,
    02559           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
    02560           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
    02561           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS
    02562         },
    02563         {
    02564           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02565           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
    02566           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
    02567           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBOSIGNALS,
    02568           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
    02569           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS
    02570         },
    02571         {
    02572           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
    02573           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
    02574           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
    02575           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
    02576           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBSSIGNALS,
    02577           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS
    02578         },
    02579         {
    02580           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS,
    02581           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS,
    02582           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS,
    02583           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS,
    02584           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS,
    02585           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NOENTRYSIGNALS
    02586         }
    02587       };
    02588
    02589       SignalType primary_signal;
    02590       SignalType secondary_signal;
    02591       if (HasSignalOnTrack(tile, TRACK_UPPER)) {
    02592         primary_signal = GetSignalType(tile, TRACK_UPPER);
    02593         secondary_signal = HasSignalOnTrack(tile, TRACK_LOWER) ? GetSignalType(tile, TRACK_LOWER) : primary_signal;
    02594       } else {
    02595         secondary_signal = primary_signal = GetSignalType(tile, TRACK_LOWER);
    02596       }
    02597
    02598       td->str = signal_type[secondary_signal][primary_signal];
    02599       break;
    02600     }
    02601
    02602     case RAIL_TILE_DEPOT:
    02603       td->str = STR_LAI_RAIL_DESCRIPTION_TRAIN_DEPOT;
    02604       if (_settings_game.vehicle.train_acceleration_model != AM_ORIGINAL) {
    02605         if (td->rail_speed > 0) {
    02606           td->rail_speed = min(td->rail_speed, 61);
    02607         } else {
    02608           td->rail_speed = 61;
    02609         }
    02610       }
    02611       break;
    02612
    02613     default:
    02614       NOT_REACHED();
    02615   }
    02616 }
    02617
    02618 static void ChangeTileOwner_Track(TileIndex tile, Owner old_owner, Owner new_owner)
    02619 {
    02620   if (!IsTileOwner(tile, old_owner)) return;
    02621
    02622   if (new_owner != INVALID_OWNER) {
    02623     SetTileOwner(tile, new_owner);
    02624   } else {
    02625     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
    02626   }
    02627 }
    02628
    02629 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
    02630 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
    02631 static const int8 _deltacoord_leaveoffset[8] = {
    02632   -1,  0,  1,  0, /* x */
    02633    0,  1,  0, -1  /* y */
    02634 };
    02635
    02636
    02642 int TicksToLeaveDepot(const Train *v)
    02643 {
    02644   DiagDirection dir = GetRailDepotDirection(v->tile);
    02645   int length = v->tcache.cached_veh_length;
    02646
    02647   switch (dir) {
    02648     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
    02649     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
    02650     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
    02651     default:
    02652     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
    02653   }
    02654
    02655   return 0; // make compilers happy
    02656 }
    02657
    02660 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *u, TileIndex tile, int x, int y)
    02661 {
    02662   /* this routine applies only to trains in depot tiles */
    02663   if (u->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
    02664
    02665   Train *v = Train::From(u);
    02666
    02667   /* depot direction */
    02668   DiagDirection dir = GetRailDepotDirection(tile);
    02669
    02670   /* calculate the point where the following wagon should be activated
    02671    * this depends on the length of the current vehicle */
    02672   int length = v->tcache.cached_veh_length;
    02673
    02674   byte fract_coord_leave =
    02675     ((_fractcoords_enter[dir] & 0x0F) + // x
    02676       (length + 1) * _deltacoord_leaveoffset[dir]) +
    02677     (((_fractcoords_enter[dir] >> 4) +  // y
    02678       ((length + 1) * _deltacoord_leaveoffset[dir + 4])) << 4);
    02679
    02680   byte fract_coord = (x & 0xF) + ((y & 0xF) << 4);
    02681
    02682   if (_fractcoords_behind[dir] == fract_coord) {
    02683     /* make sure a train is not entering the tile from behind */
    02684     return VETSB_CANNOT_ENTER;
    02685   } else if (_fractcoords_enter[dir] == fract_coord) {
    02686     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
    02687       /* enter the depot */
    02688       v->track = TRACK_BIT_DEPOT,
    02689       v->vehstatus |= VS_HIDDEN; // hide it
    02690       v->direction = ReverseDir(v->direction);
    02691       if (v->Next() == NULL) VehicleEnterDepot(v->First());
    02692       v->tile = tile;
    02693
    02694       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
    02695       return VETSB_ENTERED_WORMHOLE;
    02696     }
    02697   } else if (fract_coord_leave == fract_coord) {
    02698     if (DiagDirToDir(dir) == v->direction) {
    02699       /* leave the depot? */
    02700       if ((v = v->Next()) != NULL) {
    02701         v->vehstatus &= ~VS_HIDDEN;
    02702         v->track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
    02703       }
    02704     }
    02705   }
    02706
    02707   return VETSB_CONTINUE;
    02708 }
    02709
    02721 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, uint z_old, Slope tileh_old, uint z_new, Slope tileh_new, TrackBits rail_bits)
    02722 {
    02723   if (!_settings_game.construction.build_on_slopes || !AutoslopeEnabled()) return CMD_ERROR;
    02724
    02725   /* Is the slope-rail_bits combination valid in general? I.e. is it safe to call GetRailFoundation() ? */
    02726   if (CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile).Failed()) return CMD_ERROR;
    02727
    02728   /* Get the slopes on top of the foundations */
    02729   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
    02730   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
    02731
    02732   Corner track_corner;
    02733   switch (rail_bits) {
    02734     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
    02735     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
    02736     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
    02737     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
    02738
    02739     /* Surface slope must not be changed */
    02740     default: return (((z_old != z_new) || (tileh_old != tileh_new)) ? CMD_ERROR : CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]));
    02741   }
    02742
    02743   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
    02744   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
    02745   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
    02746   if (z_old != z_new) return CMD_ERROR;
    02747
    02748   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    02749   /* Make the ground dirty, if surface slope has changed */
    02750   if (tileh_old != tileh_new) {
    02751     /* If there is flat water on the lower halftile add the cost for clearing it */
    02752     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price[PR_CLEAR_WATER]);
    02753     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02754   }
    02755   return  cost;
    02756 }
    02757
    02758 static CommandCost TerraformTile_Track(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
    02759 {
    02760   uint z_old;
    02761   Slope tileh_old = GetTileSlope(tile, &z_old);
    02762   if (IsPlainRail(tile)) {
    02763     TrackBits rail_bits = GetTrackBits(tile);
    02764     /* Is there flat water on the lower halftile, that must be cleared expensively? */
    02765     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
    02766
    02767     _error_message = STR_ERROR_MUST_REMOVE_RAILROAD_TRACK;
    02768
    02769     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
    02770     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
    02771
    02772     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
    02773     Corner allowed_corner;
    02774     switch (rail_bits) {
    02775       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
    02776       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
    02777       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
    02778       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
    02779       default: return autoslope_result;
    02780     }
    02781
    02782     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
    02783
    02784     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
    02785     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
    02786
    02787     /* Everything is valid, which only changes allowed_corner */
    02788     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
    02789       if (allowed_corner == corner) continue;
    02790       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
    02791     }
    02792
    02793     /* Make the ground dirty */
    02794     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02795
    02796     /* allow terraforming */
    02797     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price[PR_CLEAR_WATER] : (Money)0);
    02798   } else if (_settings_game.construction.build_on_slopes && AutoslopeEnabled() &&
    02799       AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) {
    02800     return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    02801   }
    02802   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    02803 }
    02804
    02805
    02806 extern const TileTypeProcs _tile_type_rail_procs = {
    02807   DrawTile_Track,           // draw_tile_proc
    02808   GetSlopeZ_Track,          // get_slope_z_proc
    02809   ClearTile_Track,          // clear_tile_proc
    02810   NULL,                     // add_accepted_cargo_proc
    02811   GetTileDesc_Track,        // get_tile_desc_proc
    02812   GetTileTrackStatus_Track, // get_tile_track_status_proc
    02813   ClickTile_Track,          // click_tile_proc
    02814   NULL,                     // animate_tile_proc
    02815   TileLoop_Track,           // tile_loop_clear
    02816   ChangeTileOwner_Track,    // change_tile_owner_clear
    02817   NULL,                     // add_produced_cargo_proc
    02818   VehicleEnter_Track,       // vehicle_enter_tile_proc
    02819   GetFoundation_Track,      // get_foundation_proc
    02820   TerraformTile_Track,      // terraform_tile_proc
    02821 };