rail_cmd.cpp

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00001 /* $Id: rail_cmd.cpp 19155 2010-02-17 21:29:31Z 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 
00175 static bool CheckTrackCombination(TileIndex tile, TrackBits to_build, uint flags)
00176 {
00177   _error_message = STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION;
00178 
00179   if (!IsPlainRail(tile)) return false;
00180 
00181   /* So, we have a tile with tracks on it (and possibly signals). Let's see
00182    * what tracks first */
00183   TrackBits current = GetTrackBits(tile); // The current track layout.
00184   TrackBits future = current | to_build;  // The track layout we want to build.
00185 
00186   /* Are we really building something new? */
00187   if (current == future) {
00188     /* Nothing new is being built */
00189     _error_message = STR_ERROR_ALREADY_BUILT;
00190     return false;
00191   }
00192 
00193   /* Let's see if we may build this */
00194   if ((flags & DC_NO_RAIL_OVERLAP) || HasSignals(tile)) {
00195     /* If we are not allowed to overlap (flag is on for ai companies or we have
00196      * signals on the tile), check that */
00197     return future == TRACK_BIT_HORZ || future == TRACK_BIT_VERT;
00198   } else {
00199     /* Normally, we may overlap and any combination is valid */
00200     return true;
00201   }
00202 }
00203 
00204 
00206 static const TrackBits _valid_tracks_without_foundation[15] = {
00207   TRACK_BIT_ALL,
00208   TRACK_BIT_RIGHT,
00209   TRACK_BIT_UPPER,
00210   TRACK_BIT_X,
00211 
00212   TRACK_BIT_LEFT,
00213   TRACK_BIT_NONE,
00214   TRACK_BIT_Y,
00215   TRACK_BIT_LOWER,
00216 
00217   TRACK_BIT_LOWER,
00218   TRACK_BIT_Y,
00219   TRACK_BIT_NONE,
00220   TRACK_BIT_LEFT,
00221 
00222   TRACK_BIT_X,
00223   TRACK_BIT_UPPER,
00224   TRACK_BIT_RIGHT,
00225 };
00226 
00228 static const TrackBits _valid_tracks_on_leveled_foundation[15] = {
00229   TRACK_BIT_NONE,
00230   TRACK_BIT_LEFT,
00231   TRACK_BIT_LOWER,
00232   TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,
00233 
00234   TRACK_BIT_RIGHT,
00235   TRACK_BIT_ALL,
00236   TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,
00237   TRACK_BIT_ALL,
00238 
00239   TRACK_BIT_UPPER,
00240   TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,
00241   TRACK_BIT_ALL,
00242   TRACK_BIT_ALL,
00243 
00244   TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,
00245   TRACK_BIT_ALL,
00246   TRACK_BIT_ALL
00247 };
00248 
00256 Foundation GetRailFoundation(Slope tileh, TrackBits bits)
00257 {
00258   if (bits == TRACK_BIT_NONE) return FOUNDATION_NONE;
00259 
00260   if (IsSteepSlope(tileh)) {
00261     /* Test for inclined foundations */
00262     if (bits == TRACK_BIT_X) return FOUNDATION_INCLINED_X;
00263     if (bits == TRACK_BIT_Y) return FOUNDATION_INCLINED_Y;
00264 
00265     /* Get higher track */
00266     Corner highest_corner = GetHighestSlopeCorner(tileh);
00267     TrackBits higher_track = CornerToTrackBits(highest_corner);
00268 
00269     /* Only higher track? */
00270     if (bits == higher_track) return HalftileFoundation(highest_corner);
00271 
00272     /* Overlap with higher track? */
00273     if (TracksOverlap(bits | higher_track)) return FOUNDATION_INVALID;
00274 
00275     /* either lower track or both higher and lower track */
00276     return ((bits & higher_track) != 0 ? FOUNDATION_STEEP_BOTH : FOUNDATION_STEEP_LOWER);
00277   } else {
00278     if ((~_valid_tracks_without_foundation[tileh] & bits) == 0) return FOUNDATION_NONE;
00279 
00280     bool valid_on_leveled = ((~_valid_tracks_on_leveled_foundation[tileh] & bits) == 0);
00281 
00282     Corner track_corner;
00283     switch (bits) {
00284       case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
00285       case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
00286       case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
00287       case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
00288 
00289       case TRACK_BIT_HORZ:
00290         if (tileh == SLOPE_N) return HalftileFoundation(CORNER_N);
00291         if (tileh == SLOPE_S) return HalftileFoundation(CORNER_S);
00292         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00293 
00294       case TRACK_BIT_VERT:
00295         if (tileh == SLOPE_W) return HalftileFoundation(CORNER_W);
00296         if (tileh == SLOPE_E) return HalftileFoundation(CORNER_E);
00297         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00298 
00299       case TRACK_BIT_X:
00300         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_X;
00301         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00302 
00303       case TRACK_BIT_Y:
00304         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_Y;
00305         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00306 
00307       default:
00308         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00309     }
00310     /* Single diagonal track */
00311 
00312     /* Track must be at least valid on leveled foundation */
00313     if (!valid_on_leveled) return FOUNDATION_INVALID;
00314 
00315     /* If slope has three raised corners, build leveled foundation */
00316     if (IsSlopeWithThreeCornersRaised(tileh)) return FOUNDATION_LEVELED;
00317 
00318     /* If neighboured corners of track_corner are lowered, build halftile foundation */
00319     if ((tileh & SlopeWithThreeCornersRaised(OppositeCorner(track_corner))) == SlopeWithOneCornerRaised(track_corner)) return HalftileFoundation(track_corner);
00320 
00321     /* else special anti-zig-zag foundation */
00322     return SpecialRailFoundation(track_corner);
00323   }
00324 }
00325 
00326 
00336 static CommandCost CheckRailSlope(Slope tileh, TrackBits rail_bits, TrackBits existing, TileIndex tile)
00337 {
00338   /* don't allow building on the lower side of a coast */
00339   if (IsTileType(tile, MP_WATER) || (IsTileType(tile, MP_RAILWAY) && (GetRailGroundType(tile) == RAIL_GROUND_WATER))) {
00340     if (!IsSteepSlope(tileh) && ((~_valid_tracks_on_leveled_foundation[tileh] & (rail_bits | existing)) != 0)) return_cmd_error(STR_ERROR_CAN_T_BUILD_ON_WATER);
00341   }
00342 
00343   Foundation f_new = GetRailFoundation(tileh, rail_bits | existing);
00344 
00345   /* check track/slope combination */
00346   if ((f_new == FOUNDATION_INVALID) ||
00347       ((f_new != FOUNDATION_NONE) && (!_settings_game.construction.build_on_slopes))) {
00348     return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00349   }
00350 
00351   Foundation f_old = GetRailFoundation(tileh, existing);
00352   return CommandCost(EXPENSES_CONSTRUCTION, f_new != f_old ? _price[PR_BUILD_FOUNDATION] : (Money)0);
00353 }
00354 
00355 /* Validate functions for rail building */
00356 static inline bool ValParamTrackOrientation(Track track) {return IsValidTrack(track);}
00357 
00366 CommandCost CmdBuildSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00367 {
00368   RailType railtype = (RailType)p1;
00369   Track track = (Track)p2;
00370   CommandCost cost(EXPENSES_CONSTRUCTION);
00371 
00372   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
00373 
00374   Slope tileh = GetTileSlope(tile, NULL);
00375   TrackBits trackbit = TrackToTrackBits(track);
00376 
00377   switch (GetTileType(tile)) {
00378     case MP_RAILWAY: {
00379       if (!CheckTileOwnership(tile)) return CMD_ERROR;
00380 
00381       if (!IsPlainRail(tile)) return CMD_ERROR;
00382 
00383       if (!IsCompatibleRail(GetRailType(tile), railtype)) return_cmd_error(STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION);
00384 
00385       if (!CheckTrackCombination(tile, trackbit, flags) ||
00386           !EnsureNoTrainOnTrack(tile, track)) {
00387         return CMD_ERROR;
00388       }
00389 
00390       CommandCost ret = CheckRailSlope(tileh, trackbit, GetTrackBits(tile), tile);
00391       if (ret.Failed()) return ret;
00392       cost.AddCost(ret);
00393 
00394       /* If the rail types don't match, try to convert only if engines of
00395        * the new rail type are not powered on the present rail type and engines of
00396        * the present rail type are powered on the new rail type. */
00397       if (GetRailType(tile) != railtype && !HasPowerOnRail(railtype, GetRailType(tile))) {
00398         if (HasPowerOnRail(GetRailType(tile), railtype)) {
00399           ret = DoCommand(tile, tile, railtype, flags, CMD_CONVERT_RAIL);
00400           if (ret.Failed()) return ret;
00401           cost.AddCost(ret);
00402         } else {
00403           return CMD_ERROR;
00404         }
00405       }
00406 
00407       if (flags & DC_EXEC) {
00408         SetRailGroundType(tile, RAIL_GROUND_BARREN);
00409         SetTrackBits(tile, GetTrackBits(tile) | trackbit);
00410       }
00411       break;
00412     }
00413 
00414     case MP_ROAD:
00415 #define M(x) (1 << (x))
00416       /* Level crossings may only be built on these slopes */
00417       if (!HasBit(M(SLOPE_SEN) | M(SLOPE_ENW) | M(SLOPE_NWS) | M(SLOPE_NS) | M(SLOPE_WSE) | M(SLOPE_EW) | M(SLOPE_FLAT), tileh)) {
00418         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00419       }
00420 #undef M
00421 
00422       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00423 
00424       if (IsNormalRoad(tile)) {
00425         if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00426 
00427         if (GetDisallowedRoadDirections(tile) != DRD_NONE) return_cmd_error(STR_ERROR_CROSSING_ON_ONEWAY_ROAD);
00428 
00429         RoadTypes roadtypes = GetRoadTypes(tile);
00430         RoadBits road = GetRoadBits(tile, ROADTYPE_ROAD);
00431         RoadBits tram = GetRoadBits(tile, ROADTYPE_TRAM);
00432         switch (roadtypes) {
00433           default: break;
00434           case ROADTYPES_TRAM:
00435             /* Tram crossings must always have road. */
00436             if (flags & DC_EXEC) SetRoadOwner(tile, ROADTYPE_ROAD, _current_company);
00437             roadtypes |= ROADTYPES_ROAD;
00438             break;
00439 
00440           case ROADTYPES_ALL:
00441             if (road != tram) return CMD_ERROR;
00442             break;
00443         }
00444 
00445         road |= tram;
00446 
00447         if ((track == TRACK_X && road == ROAD_Y) ||
00448             (track == TRACK_Y && road == ROAD_X)) {
00449           if (flags & DC_EXEC) {
00450             MakeRoadCrossing(tile, GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), _current_company, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, roadtypes, GetTownIndex(tile));
00451             UpdateLevelCrossing(tile, false);
00452           }
00453           break;
00454         }
00455       }
00456 
00457       if (IsLevelCrossing(tile) && GetCrossingRailBits(tile) == trackbit) {
00458         return_cmd_error(STR_ERROR_ALREADY_BUILT);
00459       }
00460       /* FALLTHROUGH */
00461 
00462     default: {
00463       /* Will there be flat water on the lower halftile? */
00464       bool water_ground = IsTileType(tile, MP_WATER) && IsSlopeWithOneCornerRaised(tileh);
00465 
00466       CommandCost ret = CheckRailSlope(tileh, trackbit, TRACK_BIT_NONE, tile);
00467       if (ret.Failed()) return ret;
00468       cost.AddCost(ret);
00469 
00470       ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00471       if (ret.Failed()) return ret;
00472       cost.AddCost(ret);
00473 
00474       if (water_ground) {
00475         cost.AddCost(-_price[PR_CLEAR_WATER]);
00476         cost.AddCost(_price[PR_CLEAR_ROUGH]);
00477       }
00478 
00479       if (flags & DC_EXEC) {
00480         MakeRailNormal(tile, _current_company, trackbit, railtype);
00481         if (water_ground) SetRailGroundType(tile, RAIL_GROUND_WATER);
00482       }
00483       break;
00484     }
00485   }
00486 
00487   if (flags & DC_EXEC) {
00488     MarkTileDirtyByTile(tile);
00489     AddTrackToSignalBuffer(tile, track, _current_company);
00490     YapfNotifyTrackLayoutChange(tile, track);
00491   }
00492 
00493   cost.AddCost(RailBuildCost(railtype));
00494   return cost;
00495 }
00496 
00505 CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00506 {
00507   Track track = (Track)p2;
00508   CommandCost cost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_RAIL] );
00509   bool crossing = false;
00510 
00511   if (!ValParamTrackOrientation((Track)p2)) return CMD_ERROR;
00512   TrackBits trackbit = TrackToTrackBits(track);
00513 
00514   /* Need to read tile owner now because it may change when the rail is removed
00515    * Also, in case of floods, _current_company != owner
00516    * There may be invalid tiletype even in exec run (when removing long track),
00517    * so do not call GetTileOwner(tile) in any case here */
00518   Owner owner = INVALID_OWNER;
00519 
00520   Train *v = NULL;
00521 
00522   switch (GetTileType(tile)) {
00523     case MP_ROAD: {
00524       if (!IsLevelCrossing(tile) ||
00525           GetCrossingRailBits(tile) != trackbit ||
00526           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
00527           (!(flags & DC_BANKRUPT) && !EnsureNoVehicleOnGround(tile))) {
00528         return CMD_ERROR;
00529       }
00530 
00531       if (flags & DC_EXEC) {
00532         if (HasReservedTracks(tile, trackbit)) {
00533           v = GetTrainForReservation(tile, track);
00534           if (v != NULL) FreeTrainTrackReservation(v);
00535         }
00536         owner = GetTileOwner(tile);
00537         MakeRoadNormal(tile, GetCrossingRoadBits(tile), GetRoadTypes(tile), GetTownIndex(tile), GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM));
00538       }
00539       break;
00540     }
00541 
00542     case MP_RAILWAY: {
00543       TrackBits present;
00544 
00545       if (!IsPlainRail(tile) ||
00546           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
00547           !EnsureNoTrainOnTrack(tile, track)) {
00548         return CMD_ERROR;
00549       }
00550 
00551       present = GetTrackBits(tile);
00552       if ((present & trackbit) == 0) return CMD_ERROR;
00553       if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
00554 
00555       /* Charge extra to remove signals on the track, if they are there */
00556       if (HasSignalOnTrack(tile, track))
00557         cost.AddCost(DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS));
00558 
00559       if (flags & DC_EXEC) {
00560         if (HasReservedTracks(tile, trackbit)) {
00561           v = GetTrainForReservation(tile, track);
00562           if (v != NULL) FreeTrainTrackReservation(v);
00563         }
00564         owner = GetTileOwner(tile);
00565         present ^= trackbit;
00566         if (present == 0) {
00567           Slope tileh = GetTileSlope(tile, NULL);
00568           /* If there is flat water on the lower halftile, convert the tile to shore so the water remains */
00569           if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh)) {
00570             MakeShore(tile);
00571           } else {
00572             DoClearSquare(tile);
00573           }
00574         } else {
00575           SetTrackBits(tile, present);
00576           SetTrackReservation(tile, GetRailReservationTrackBits(tile) & present);
00577         }
00578       }
00579       break;
00580     }
00581 
00582     default: return CMD_ERROR;
00583   }
00584 
00585   if (flags & DC_EXEC) {
00586     /* if we got that far, 'owner' variable is set correctly */
00587     assert(Company::IsValidID(owner));
00588 
00589     MarkTileDirtyByTile(tile);
00590     if (crossing) {
00591       /* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we
00592        * are removing one of these pieces, we'll need to update signals for
00593        * both directions explicitly, as after the track is removed it won't
00594        * 'connect' with the other piece. */
00595       AddTrackToSignalBuffer(tile, TRACK_X, owner);
00596       AddTrackToSignalBuffer(tile, TRACK_Y, owner);
00597       YapfNotifyTrackLayoutChange(tile, TRACK_X);
00598       YapfNotifyTrackLayoutChange(tile, TRACK_Y);
00599     } else {
00600       AddTrackToSignalBuffer(tile, track, owner);
00601       YapfNotifyTrackLayoutChange(tile, track);
00602     }
00603 
00604     if (v != NULL) TryPathReserve(v, true);
00605   }
00606 
00607   return cost;
00608 }
00609 
00610 
00618 bool FloodHalftile(TileIndex t)
00619 {
00620   assert(IsPlainRailTile(t));
00621 
00622   bool flooded = false;
00623   if (GetRailGroundType(t) == RAIL_GROUND_WATER) return flooded;
00624 
00625   Slope tileh = GetTileSlope(t, NULL);
00626   TrackBits rail_bits = GetTrackBits(t);
00627 
00628   if (IsSlopeWithOneCornerRaised(tileh)) {
00629     TrackBits lower_track = CornerToTrackBits(OppositeCorner(GetHighestSlopeCorner(tileh)));
00630 
00631     TrackBits to_remove = lower_track & rail_bits;
00632     if (to_remove != 0) {
00633       _current_company = OWNER_WATER;
00634       if (DoCommand(t, 0, FIND_FIRST_BIT(to_remove), DC_EXEC, CMD_REMOVE_SINGLE_RAIL).Failed()) return flooded; // not yet floodable
00635       flooded = true;
00636       rail_bits = rail_bits & ~to_remove;
00637       if (rail_bits == 0) {
00638         MakeShore(t);
00639         MarkTileDirtyByTile(t);
00640         return flooded;
00641       }
00642     }
00643 
00644     if (IsNonContinuousFoundation(GetRailFoundation(tileh, rail_bits))) {
00645       flooded = true;
00646       SetRailGroundType(t, RAIL_GROUND_WATER);
00647       MarkTileDirtyByTile(t);
00648     }
00649   } else {
00650     /* Make shore on steep slopes and 'three-corners-raised'-slopes. */
00651     if (ApplyFoundationToSlope(GetRailFoundation(tileh, rail_bits), &tileh) == 0) {
00652       if (IsSteepSlope(tileh) || IsSlopeWithThreeCornersRaised(tileh)) {
00653         flooded = true;
00654         SetRailGroundType(t, RAIL_GROUND_WATER);
00655         MarkTileDirtyByTile(t);
00656       }
00657     }
00658   }
00659   return flooded;
00660 }
00661 
00662 static const TileIndexDiffC _trackdelta[] = {
00663   { -1,  0 }, {  0,  1 }, { -1,  0 }, {  0,  1 }, {  1,  0 }, {  0,  1 },
00664   {  0,  0 },
00665   {  0,  0 },
00666   {  1,  0 }, {  0, -1 }, {  0, -1 }, {  1,  0 }, {  0, -1 }, { -1,  0 },
00667   {  0,  0 },
00668   {  0,  0 }
00669 };
00670 
00671 
00672 static CommandCost ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)
00673 {
00674   int x = TileX(start);
00675   int y = TileY(start);
00676   int ex = TileX(end);
00677   int ey = TileY(end);
00678 
00679   if (!ValParamTrackOrientation(TrackdirToTrack(*trackdir))) return CMD_ERROR;
00680 
00681   /* calculate delta x,y from start to end tile */
00682   int dx = ex - x;
00683   int dy = ey - y;
00684 
00685   /* calculate delta x,y for the first direction */
00686   int trdx = _trackdelta[*trackdir].x;
00687   int trdy = _trackdelta[*trackdir].y;
00688 
00689   if (!IsDiagonalTrackdir(*trackdir)) {
00690     trdx += _trackdelta[*trackdir ^ 1].x;
00691     trdy += _trackdelta[*trackdir ^ 1].y;
00692   }
00693 
00694   /* validate the direction */
00695   while (
00696     (trdx <= 0 && dx > 0) ||
00697     (trdx >= 0 && dx < 0) ||
00698     (trdy <= 0 && dy > 0) ||
00699     (trdy >= 0 && dy < 0)
00700   ) {
00701     if (!HasBit(*trackdir, 3)) { // first direction is invalid, try the other
00702       SetBit(*trackdir, 3); // reverse the direction
00703       trdx = -trdx;
00704       trdy = -trdy;
00705     } else { // other direction is invalid too, invalid drag
00706       return CMD_ERROR;
00707     }
00708   }
00709 
00710   /* (for diagonal tracks, this is already made sure of by above test), but:
00711    * for non-diagonal tracks, check if the start and end tile are on 1 line */
00712   if (!IsDiagonalTrackdir(*trackdir)) {
00713     trdx = _trackdelta[*trackdir].x;
00714     trdy = _trackdelta[*trackdir].y;
00715     if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx))
00716       return CMD_ERROR;
00717   }
00718 
00719   return CommandCost();
00720 }
00721 
00734 static CommandCost CmdRailTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00735 {
00736   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
00737   Track track = (Track)GB(p2, 4, 3);
00738   bool remove = HasBit(p2, 7);
00739   RailType railtype = (RailType)GB(p2, 0, 4);
00740 
00741   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
00742   if (p1 >= MapSize()) return CMD_ERROR;
00743   TileIndex end_tile = p1;
00744   Trackdir trackdir = TrackToTrackdir(track);
00745 
00746   if (ValidateAutoDrag(&trackdir, tile, end_tile).Failed()) return CMD_ERROR;
00747 
00748   if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, tile);
00749 
00750   for (;;) {
00751     ret = DoCommand(tile, railtype, TrackdirToTrack(trackdir), flags, remove ? CMD_REMOVE_SINGLE_RAIL : CMD_BUILD_SINGLE_RAIL);
00752 
00753     if (ret.Failed()) {
00754       if (_error_message != STR_ERROR_ALREADY_BUILT && !remove) {
00755         if (HasBit(p2, 8)) return CMD_ERROR;
00756         break;
00757       }
00758       _error_message = INVALID_STRING_ID;
00759     } else {
00760       total_cost.AddCost(ret);
00761     }
00762 
00763     if (tile == end_tile) break;
00764 
00765     tile += ToTileIndexDiff(_trackdelta[trackdir]);
00766 
00767     /* toggle railbit for the non-diagonal tracks */
00768     if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
00769   }
00770 
00771   return (total_cost.GetCost() == 0) ? CommandCost(remove ? INVALID_STRING_ID : (_error_message == INVALID_STRING_ID ? STR_ERROR_ALREADY_BUILT : _error_message)) : total_cost;
00772 }
00773 
00787 CommandCost CmdBuildRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00788 {
00789   return CmdRailTrackHelper(tile, flags, p1, ClrBit(p2, 7), text);
00790 }
00791 
00805 CommandCost CmdRemoveRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00806 {
00807   return CmdRailTrackHelper(tile, flags, p1, SetBit(p2, 7), text);
00808 }
00809 
00821 CommandCost CmdBuildTrainDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00822 {
00823   /* check railtype and valid direction for depot (0 through 3), 4 in total */
00824   if (!ValParamRailtype((RailType)p1)) return CMD_ERROR;
00825 
00826   Slope tileh = GetTileSlope(tile, NULL);
00827 
00828   DiagDirection dir = Extract<DiagDirection, 0>(p2);
00829 
00830   /* Prohibit construction if
00831    * The tile is non-flat AND
00832    * 1) build-on-slopes is disabled
00833    * 2) the tile is steep i.e. spans two height levels
00834    * 3) the exit points in the wrong direction
00835    */
00836 
00837   if (tileh != SLOPE_FLAT && (
00838         !_settings_game.construction.build_on_slopes ||
00839         IsSteepSlope(tileh) ||
00840         !CanBuildDepotByTileh(dir, tileh)
00841       )) {
00842     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00843   }
00844 
00845   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00846   if (cost.Failed()) return CMD_ERROR;
00847 
00848   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
00849 
00850   if (!Depot::CanAllocateItem()) return CMD_ERROR;
00851 
00852   if (flags & DC_EXEC) {
00853     Depot *d = new Depot(tile);
00854     d->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
00855 
00856     MakeRailDepot(tile, _current_company, d->index, dir, (RailType)p1);
00857     MarkTileDirtyByTile(tile);
00858 
00859     AddSideToSignalBuffer(tile, INVALID_DIAGDIR, _current_company);
00860     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
00861   }
00862 
00863   cost.AddCost(_price[PR_BUILD_DEPOT_TRAIN]);
00864   return cost;
00865 }
00866 
00887 CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00888 {
00889   Track track = (Track)GB(p1, 0, 3);
00890   bool ctrl_pressed = HasBit(p1, 3); // was the CTRL button pressed
00891   SignalVariant sigvar = (ctrl_pressed ^ HasBit(p1, 4)) ? SIG_SEMAPHORE : SIG_ELECTRIC; // the signal variant of the new signal
00892   SignalType sigtype = (SignalType)GB(p1, 5, 3); // the signal type of the new signal
00893   bool convert_signal = HasBit(p1, 8); // convert button pressed
00894   SignalType cycle_start = (SignalType)GB(p1, 9, 3);
00895   SignalType cycle_stop = (SignalType)GB(p1, 12, 3);
00896   uint num_dir_cycle = GB(p1, 15, 2);
00897 
00898   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
00899 
00900   /* You can only build signals on plain rail tiles, and the selected track must exist */
00901   if (!ValParamTrackOrientation(track) || !IsPlainRailTile(tile) ||
00902       !HasTrack(tile, track) || !EnsureNoTrainOnTrack(tile, track)) {
00903     return CMD_ERROR;
00904   }
00905 
00906   /* Protect against invalid signal copying */
00907   if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
00908 
00909   if (!CheckTileOwnership(tile)) return CMD_ERROR;
00910 
00911   {
00912     /* See if this is a valid track combination for signals, (ie, no overlap) */
00913     TrackBits trackbits = GetTrackBits(tile);
00914     if (KillFirstBit(trackbits) != TRACK_BIT_NONE && // More than one track present
00915         trackbits != TRACK_BIT_HORZ &&
00916         trackbits != TRACK_BIT_VERT) {
00917       return_cmd_error(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK);
00918     }
00919   }
00920 
00921   /* In case we don't want to change an existing signal, return without error. */
00922   if (HasBit(p1, 17) && HasSignalOnTrack(tile, track)) return CommandCost();
00923 
00924   /* you can not convert a signal if no signal is on track */
00925   if (convert_signal && !HasSignalOnTrack(tile, track)) return CMD_ERROR;
00926 
00927   CommandCost cost;
00928   if (!HasSignalOnTrack(tile, track)) {
00929     /* build new signals */
00930     cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS]);
00931   } else {
00932     if (p2 != 0 && sigvar != GetSignalVariant(tile, track)) {
00933       /* convert signals <-> semaphores */
00934       cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
00935 
00936     } else if (convert_signal) {
00937       /* convert button pressed */
00938       if (ctrl_pressed || GetSignalVariant(tile, track) != sigvar) {
00939         /* convert electric <-> semaphore */
00940         cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
00941       } else {
00942         /* it is free to change signal type: normal-pre-exit-combo */
00943         cost = CommandCost();
00944       }
00945 
00946     } else {
00947       /* it is free to change orientation/pre-exit-combo signals */
00948       cost = CommandCost();
00949     }
00950   }
00951 
00952   if (flags & DC_EXEC) {
00953     Train *v = NULL;
00954     /* The new/changed signal could block our path. As this can lead to
00955      * stale reservations, we clear the path reservation here and try
00956      * to redo it later on. */
00957     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
00958       v = GetTrainForReservation(tile, track);
00959       if (v != NULL) FreeTrainTrackReservation(v);
00960     }
00961 
00962     if (!HasSignals(tile)) {
00963       /* there are no signals at all on this tile yet */
00964       SetHasSignals(tile, true);
00965       SetSignalStates(tile, 0xF); // all signals are on
00966       SetPresentSignals(tile, 0); // no signals built by default
00967       SetSignalType(tile, track, sigtype);
00968       SetSignalVariant(tile, track, sigvar);
00969     }
00970 
00971     if (p2 == 0) {
00972       if (!HasSignalOnTrack(tile, track)) {
00973         /* build new signals */
00974         SetPresentSignals(tile, GetPresentSignals(tile) | (IsPbsSignal(sigtype) ? KillFirstBit(SignalOnTrack(track)) : SignalOnTrack(track)));
00975         SetSignalType(tile, track, sigtype);
00976         SetSignalVariant(tile, track, sigvar);
00977         while (num_dir_cycle-- > 0) CycleSignalSide(tile, track);
00978       } else {
00979         if (convert_signal) {
00980           /* convert signal button pressed */
00981           if (ctrl_pressed) {
00982             /* toggle the pressent signal variant: SIG_ELECTRIC <-> SIG_SEMAPHORE */
00983             SetSignalVariant(tile, track, (GetSignalVariant(tile, track) == SIG_ELECTRIC) ? SIG_SEMAPHORE : SIG_ELECTRIC);
00984             /* Query current signal type so the check for PBS signals below works. */
00985             sigtype = GetSignalType(tile, track);
00986           } else {
00987             /* convert the present signal to the chosen type and variant */
00988             SetSignalType(tile, track, sigtype);
00989             SetSignalVariant(tile, track, sigvar);
00990             if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
00991               SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
00992             }
00993           }
00994 
00995         } else if (ctrl_pressed) {
00996           /* cycle between cycle_start and cycle_end */
00997           sigtype = (SignalType)(GetSignalType(tile, track) + 1);
00998 
00999           if (sigtype < cycle_start || sigtype > cycle_stop) sigtype = cycle_start;
01000 
01001           SetSignalType(tile, track, sigtype);
01002           if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
01003             SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
01004           }
01005         } else {
01006           /* cycle the signal side: both -> left -> right -> both -> ... */
01007           CycleSignalSide(tile, track);
01008           /* Query current signal type so the check for PBS signals below works. */
01009           sigtype = GetSignalType(tile, track);
01010         }
01011       }
01012     } else {
01013       /* If CmdBuildManySignals is called with copying signals, just copy the
01014        * direction of the first signal given as parameter by CmdBuildManySignals */
01015       SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | (p2 & SignalOnTrack(track)));
01016       SetSignalVariant(tile, track, sigvar);
01017       SetSignalType(tile, track, sigtype);
01018     }
01019 
01020     if (IsPbsSignal(sigtype)) {
01021       /* PBS signals should show red unless they are on a reservation. */
01022       uint mask = GetPresentSignals(tile) & SignalOnTrack(track);
01023       SetSignalStates(tile, (GetSignalStates(tile) & ~mask) | ((HasBit(GetRailReservationTrackBits(tile), track) ? UINT_MAX : 0) & mask));
01024     }
01025     MarkTileDirtyByTile(tile);
01026     AddTrackToSignalBuffer(tile, track, _current_company);
01027     YapfNotifyTrackLayoutChange(tile, track);
01028     if (v != NULL) {
01029       /* Extend the train's path if it's not stopped or loading, or not at a safe position. */
01030       if (!(((v->vehstatus & VS_STOPPED) && v->cur_speed == 0) || v->current_order.IsType(OT_LOADING)) ||
01031           !IsSafeWaitingPosition(v, v->tile, v->GetVehicleTrackdir(), true, _settings_game.pf.forbid_90_deg)) {
01032         TryPathReserve(v, true);
01033       }
01034     }
01035   }
01036 
01037   return cost;
01038 }
01039 
01040 static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
01041 {
01042   tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
01043   if (tile == INVALID_TILE) return false;
01044 
01045   /* Check for track bits on the new tile */
01046   TrackdirBits trackdirbits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
01047 
01048   if (TracksOverlap(TrackdirBitsToTrackBits(trackdirbits))) return false;
01049   trackdirbits &= TrackdirReachesTrackdirs(trackdir);
01050 
01051   /* No track bits, must stop */
01052   if (trackdirbits == TRACKDIR_BIT_NONE) return false;
01053 
01054   /* Get the first track dir */
01055   trackdir = RemoveFirstTrackdir(&trackdirbits);
01056 
01057   /* Any left? It's a junction so we stop */
01058   if (trackdirbits != TRACKDIR_BIT_NONE) return false;
01059 
01060   switch (GetTileType(tile)) {
01061     case MP_RAILWAY:
01062       if (IsRailDepot(tile)) return false;
01063       if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
01064       signal_ctr++;
01065       if (IsDiagonalTrackdir(trackdir)) {
01066         signal_ctr++;
01067         /* Ensure signal_ctr even so X and Y pieces get signals */
01068         ClrBit(signal_ctr, 0);
01069       }
01070       return true;
01071 
01072     case MP_ROAD:
01073       if (!IsLevelCrossing(tile)) return false;
01074       signal_ctr += 2;
01075       return true;
01076 
01077     case MP_TUNNELBRIDGE: {
01078       TileIndex orig_tile = tile; // backup old value
01079 
01080       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
01081       if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
01082 
01083       /* Skip to end of tunnel or bridge
01084        * note that tile is a parameter by reference, so it must be updated */
01085       tile = GetOtherTunnelBridgeEnd(tile);
01086 
01087       signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
01088       return true;
01089     }
01090 
01091     default: return false;
01092   }
01093 }
01094 
01110 static CommandCost CmdSignalTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01111 {
01112   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
01113   bool err = true;
01114   TileIndex start_tile = tile;
01115 
01116   Track track = (Track)GB(p2, 0, 3);
01117   bool mode = HasBit(p2, 3);
01118   bool semaphores = HasBit(p2, 4);
01119   bool remove = HasBit(p2, 5);
01120   bool autofill = HasBit(p2, 6);
01121   Trackdir trackdir = TrackToTrackdir(track);
01122   byte signal_density = GB(p2, 24, 8);
01123 
01124   if (p1 >= MapSize()) return CMD_ERROR;
01125   TileIndex end_tile = p1;
01126   if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
01127 
01128   if (!IsPlainRailTile(tile)) return CMD_ERROR;
01129 
01130   /* for vertical/horizontal tracks, double the given signals density
01131    * since the original amount will be too dense (shorter tracks) */
01132   signal_density *= 2;
01133 
01134   if (ValidateAutoDrag(&trackdir, tile, end_tile).Failed()) return CMD_ERROR;
01135 
01136   track = TrackdirToTrack(trackdir); // trackdir might have changed, keep track in sync
01137   Trackdir start_trackdir = trackdir;
01138 
01139   /* Must start on a valid track to be able to avoid loops */
01140   if (!HasTrack(tile, track)) return CMD_ERROR;
01141 
01142   SignalType sigtype = (SignalType)GB(p2, 7, 3);
01143   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
01144 
01145   byte signals;
01146   /* copy the signal-style of the first rail-piece if existing */
01147   if (HasSignalOnTrack(tile, track)) {
01148     signals = GetPresentSignals(tile) & SignalOnTrack(track);
01149     assert(signals != 0);
01150 
01151     /* copy signal/semaphores style (independent of CTRL) */
01152     semaphores = GetSignalVariant(tile, track) != SIG_ELECTRIC;
01153 
01154     sigtype = GetSignalType(tile, track);
01155     /* Don't but copy pre-signal type */
01156     if (sigtype < SIGTYPE_PBS) sigtype = SIGTYPE_NORMAL;
01157   } else { // no signals exist, drag a two-way signal stretch
01158     signals = IsPbsSignal(sigtype) ? SignalAlongTrackdir(trackdir) : SignalOnTrack(track);
01159   }
01160 
01161   byte signal_dir = 0;
01162   if (signals & SignalAlongTrackdir(trackdir))   SetBit(signal_dir, 0);
01163   if (signals & SignalAgainstTrackdir(trackdir)) SetBit(signal_dir, 1);
01164 
01165   /* signal_ctr         - amount of tiles already processed
01166    * signals_density    - setting to put signal on every Nth tile (double space on |, -- tracks)
01167    **********
01168    * trackdir   - trackdir to build with autorail
01169    * semaphores - semaphores or signals
01170    * signals    - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
01171    *              and convert all others to semaphore/signal
01172    * remove     - 1 remove signals, 0 build signals */
01173   int signal_ctr = 0;
01174   for (;;) {
01175     /* only build/remove signals with the specified density */
01176     if ((remove && autofill) || signal_ctr % signal_density == 0) {
01177       uint32 p1 = GB(TrackdirToTrack(trackdir), 0, 3);
01178       SB(p1, 3, 1, mode);
01179       SB(p1, 4, 1, semaphores);
01180       SB(p1, 5, 3, sigtype);
01181       if (!remove && signal_ctr == 0) SetBit(p1, 17);
01182 
01183       /* Pick the correct orientation for the track direction */
01184       signals = 0;
01185       if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
01186       if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
01187 
01188       ret = DoCommand(tile, p1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
01189 
01190       /* Be user-friendly and try placing signals as much as possible */
01191       if (ret.Succeeded()) {
01192         err = false;
01193         total_cost.AddCost(ret);
01194       }
01195     }
01196 
01197     if (autofill) {
01198       if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
01199 
01200       /* Prevent possible loops */
01201       if (tile == start_tile && trackdir == start_trackdir) break;
01202     } else {
01203       if (tile == end_tile) break;
01204 
01205       tile += ToTileIndexDiff(_trackdelta[trackdir]);
01206       signal_ctr++;
01207 
01208       /* toggle railbit for the non-diagonal tracks (|, -- tracks) */
01209       if (IsDiagonalTrackdir(trackdir)) {
01210         signal_ctr++;
01211       } else {
01212         ToggleBit(trackdir, 0);
01213       }
01214     }
01215   }
01216 
01217   return err ? CMD_ERROR : total_cost;
01218 }
01219 
01237 CommandCost CmdBuildSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01238 {
01239   return CmdSignalTrackHelper(tile, flags, p1, p2, text);
01240 }
01241 
01253 CommandCost CmdRemoveSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01254 {
01255   Track track = (Track)GB(p1, 0, 3);
01256 
01257   if (!ValParamTrackOrientation(track) ||
01258       !IsPlainRailTile(tile) ||
01259       !HasTrack(tile, track) ||
01260       !EnsureNoTrainOnTrack(tile, track) ||
01261       !HasSignalOnTrack(tile, track)) {
01262     return CMD_ERROR;
01263   }
01264 
01265   /* Only water can remove signals from anyone */
01266   if (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) return CMD_ERROR;
01267 
01268   /* Do it? */
01269   if (flags & DC_EXEC) {
01270     Train *v = NULL;
01271     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
01272       v = GetTrainForReservation(tile, track);
01273     } else if (IsPbsSignal(GetSignalType(tile, track))) {
01274       /* PBS signal, might be the end of a path reservation. */
01275       Trackdir td = TrackToTrackdir(track);
01276       for (int i = 0; v == NULL && i < 2; i++, td = ReverseTrackdir(td)) {
01277         /* Only test the active signal side. */
01278         if (!HasSignalOnTrackdir(tile, ReverseTrackdir(td))) continue;
01279         TileIndex next = TileAddByDiagDir(tile, TrackdirToExitdir(td));
01280         TrackBits tracks = TrackdirBitsToTrackBits(TrackdirReachesTrackdirs(td));
01281         if (HasReservedTracks(next, tracks)) {
01282           v = GetTrainForReservation(next, TrackBitsToTrack(GetReservedTrackbits(next) & tracks));
01283         }
01284       }
01285     }
01286     SetPresentSignals(tile, GetPresentSignals(tile) & ~SignalOnTrack(track));
01287 
01288     /* removed last signal from tile? */
01289     if (GetPresentSignals(tile) == 0) {
01290       SetSignalStates(tile, 0);
01291       SetHasSignals(tile, false);
01292       SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
01293     }
01294 
01295     AddTrackToSignalBuffer(tile, track, GetTileOwner(tile));
01296     YapfNotifyTrackLayoutChange(tile, track);
01297     if (v != NULL) TryPathReserve(v, false);
01298 
01299     MarkTileDirtyByTile(tile);
01300   }
01301 
01302   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_SIGNALS]);
01303 }
01304 
01322 CommandCost CmdRemoveSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01323 {
01324   return CmdSignalTrackHelper(tile, flags, p1, SetBit(p2, 5), text); // bit 5 is remove bit
01325 }
01326 
01328 static Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
01329 {
01330   if (v->type != VEH_TRAIN) return NULL;
01331 
01332   /* Similar checks as in Train::PowerChanged() */
01333 
01334   Train *t = Train::From(v);
01335   if (t->IsArticulatedPart()) return NULL;
01336 
01337   const RailVehicleInfo *rvi = RailVehInfo(t->engine_type);
01338   if (GetVehicleProperty(t, PROP_TRAIN_POWER, rvi->power) != 0) t->First()->PowerChanged();
01339 
01340   return NULL;
01341 }
01342 
01352 CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01353 {
01354   CommandCost cost(EXPENSES_CONSTRUCTION);
01355   RailType totype = (RailType)p2;
01356 
01357   if (!ValParamRailtype(totype)) return CMD_ERROR;
01358   if (p1 >= MapSize()) return CMD_ERROR;
01359 
01360   uint ex = TileX(tile);
01361   uint ey = TileY(tile);
01362   uint sx = TileX(p1);
01363   uint sy = TileY(p1);
01364 
01365   /* make sure sx,sy are smaller than ex,ey */
01366   if (ex < sx) Swap(ex, sx);
01367   if (ey < sy) Swap(ey, sy);
01368 
01369   _error_message = STR_ERROR_NO_SUITABLE_RAILROAD_TRACK; // by default, there is no track to convert
01370 
01371   for (uint x = sx; x <= ex; ++x) {
01372     for (uint y = sy; y <= ey; ++y) {
01373       TileIndex tile = TileXY(x, y);
01374       TileType tt = GetTileType(tile);
01375 
01376       /* Check if there is any track on tile */
01377       switch (tt) {
01378         case MP_RAILWAY:
01379           break;
01380         case MP_STATION:
01381           if (!HasStationRail(tile)) continue;
01382           break;
01383         case MP_ROAD:
01384           if (!IsLevelCrossing(tile)) continue;
01385           break;
01386         case MP_TUNNELBRIDGE:
01387           if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
01388           break;
01389         default: continue;
01390       }
01391 
01392       /* Original railtype we are converting from */
01393       RailType type = GetRailType(tile);
01394 
01395       /* Converting to the same type or converting 'hidden' elrail -> rail */
01396       if (type == totype || (_settings_game.vehicle.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
01397 
01398       /* Trying to convert other's rail */
01399       if (!CheckTileOwnership(tile)) continue;
01400 
01401       SmallVector<Train *, 2> vehicles_affected;
01402 
01403       /* Vehicle on the tile when not converting Rail <-> ElRail
01404        * Tunnels and bridges have special check later */
01405       if (tt != MP_TUNNELBRIDGE) {
01406         if (!IsCompatibleRail(type, totype) && !EnsureNoVehicleOnGround(tile)) continue;
01407         if (flags & DC_EXEC) { // we can safely convert, too
01408           TrackBits reserved = GetReservedTrackbits(tile);
01409           Track     track;
01410           while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
01411             Train *v = GetTrainForReservation(tile, track);
01412             if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
01413               /* No power on new rail type, reroute. */
01414               FreeTrainTrackReservation(v);
01415               *vehicles_affected.Append() = v;
01416             }
01417           }
01418 
01419           SetRailType(tile, totype);
01420           MarkTileDirtyByTile(tile);
01421           /* update power of train engines on this tile */
01422           FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
01423         }
01424       }
01425 
01426       switch (tt) {
01427         case MP_RAILWAY:
01428           switch (GetRailTileType(tile)) {
01429             case RAIL_TILE_DEPOT:
01430               if (flags & DC_EXEC) {
01431                 /* notify YAPF about the track layout change */
01432                 YapfNotifyTrackLayoutChange(tile, GetRailDepotTrack(tile));
01433 
01434                 /* Update build vehicle window related to this depot */
01435                 InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
01436                 InvalidateWindowData(WC_BUILD_VEHICLE, tile);
01437               }
01438               cost.AddCost(RailConvertCost(type, totype));
01439               break;
01440 
01441             default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
01442               if (flags & DC_EXEC) {
01443                 /* notify YAPF about the track layout change */
01444                 TrackBits tracks = GetTrackBits(tile);
01445                 while (tracks != TRACK_BIT_NONE) {
01446                   YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
01447                 }
01448               }
01449               cost.AddCost(RailConvertCost(type, totype) * CountBits(GetTrackBits(tile)));
01450               break;
01451           }
01452           break;
01453 
01454         case MP_TUNNELBRIDGE: {
01455           TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
01456 
01457           /* If both ends of tunnel/bridge are in the range, do not try to convert twice -
01458            * it would cause assert because of different test and exec runs */
01459           if (endtile < tile && TileX(endtile) >= sx && TileX(endtile) <= ex &&
01460               TileY(endtile) >= sy && TileY(endtile) <= ey) continue;
01461 
01462           /* When not coverting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
01463           if (!IsCompatibleRail(GetRailType(tile), totype) &&
01464               HasVehicleOnTunnelBridge(tile, endtile)) continue;
01465 
01466           if (flags & DC_EXEC) {
01467             Track track = DiagDirToDiagTrack(GetTunnelBridgeDirection(tile));
01468             if (HasTunnelBridgeReservation(tile)) {
01469               Train *v = GetTrainForReservation(tile, track);
01470               if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
01471                 /* No power on new rail type, reroute. */
01472                 FreeTrainTrackReservation(v);
01473                 *vehicles_affected.Append() = v;
01474               }
01475             }
01476             SetRailType(tile, totype);
01477             SetRailType(endtile, totype);
01478 
01479             FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
01480             FindVehicleOnPos(endtile, NULL, &UpdateTrainPowerProc);
01481 
01482             YapfNotifyTrackLayoutChange(tile, track);
01483             YapfNotifyTrackLayoutChange(endtile, track);
01484 
01485             MarkTileDirtyByTile(tile);
01486             MarkTileDirtyByTile(endtile);
01487 
01488             if (IsBridge(tile)) {
01489               TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
01490               TileIndex t = tile + delta;
01491               for (; t != endtile; t += delta) MarkTileDirtyByTile(t); // TODO encapsulate this into a function
01492             }
01493           }
01494 
01495           cost.AddCost((GetTunnelBridgeLength(tile, endtile) + 2) * RailConvertCost(type, totype));
01496         } break;
01497 
01498         default: // MP_STATION, MP_ROAD
01499           if (flags & DC_EXEC) {
01500             Track track = ((tt == MP_STATION) ? GetRailStationTrack(tile) : GetCrossingRailTrack(tile));
01501             YapfNotifyTrackLayoutChange(tile, track);
01502           }
01503 
01504           cost.AddCost(RailConvertCost(type, totype));
01505           break;
01506       }
01507 
01508       for (uint i = 0; i < vehicles_affected.Length(); ++i) {
01509         TryPathReserve(vehicles_affected[i], true);
01510       }
01511     }
01512   }
01513 
01514   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
01515 }
01516 
01517 static CommandCost RemoveTrainDepot(TileIndex tile, DoCommandFlag flags)
01518 {
01519   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER)
01520     return CMD_ERROR;
01521 
01522   if (!EnsureNoVehicleOnGround(tile))
01523     return CMD_ERROR;
01524 
01525   if (flags & DC_EXEC) {
01526     /* read variables before the depot is removed */
01527     DiagDirection dir = GetRailDepotDirection(tile);
01528     Owner owner = GetTileOwner(tile);
01529     Train *v = NULL;
01530 
01531     if (HasDepotReservation(tile)) {
01532       v = GetTrainForReservation(tile, DiagDirToDiagTrack(dir));
01533       if (v != NULL) FreeTrainTrackReservation(v);
01534     }
01535 
01536     delete Depot::GetByTile(tile);
01537     DoClearSquare(tile);
01538     AddSideToSignalBuffer(tile, dir, owner);
01539     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
01540     if (v != NULL) TryPathReserve(v, true);
01541   }
01542 
01543   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_TRAIN]);
01544 }
01545 
01546 static CommandCost ClearTile_Track(TileIndex tile, DoCommandFlag flags)
01547 {
01548   CommandCost cost(EXPENSES_CONSTRUCTION);
01549 
01550   if (flags & DC_AUTO) {
01551     if (!IsTileOwner(tile, _current_company)) {
01552       return_cmd_error(STR_ERROR_AREA_IS_OWNED_BY_ANOTHER);
01553     }
01554 
01555     if (IsPlainRail(tile)) {
01556       return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
01557     } else {
01558       return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
01559     }
01560   }
01561 
01562   switch (GetRailTileType(tile)) {
01563     case RAIL_TILE_SIGNALS:
01564     case RAIL_TILE_NORMAL: {
01565       Slope tileh = GetTileSlope(tile, NULL);
01566       /* Is there flat water on the lower halftile, that gets cleared expensively? */
01567       bool water_ground = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh));
01568 
01569       TrackBits tracks = GetTrackBits(tile);
01570       while (tracks != TRACK_BIT_NONE) {
01571         Track track = RemoveFirstTrack(&tracks);
01572         CommandCost ret = DoCommand(tile, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
01573         if (ret.Failed()) return CMD_ERROR;
01574         cost.AddCost(ret);
01575       }
01576 
01577       /* when bankrupting, don't make water dirty, there could be a ship on lower halftile */
01578       if (water_ground && !(flags & DC_BANKRUPT)) {
01579         if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
01580 
01581         /* The track was removed, and left a coast tile. Now also clear the water. */
01582         if (flags & DC_EXEC) DoClearSquare(tile);
01583         cost.AddCost(_price[PR_CLEAR_WATER]);
01584       }
01585 
01586       return cost;
01587     }
01588 
01589     case RAIL_TILE_DEPOT:
01590       return RemoveTrainDepot(tile, flags);
01591 
01592     default:
01593       return CMD_ERROR;
01594   }
01595 }
01596 
01601 static uint GetSaveSlopeZ(uint x, uint y, Track track)
01602 {
01603   switch (track) {
01604     case TRACK_UPPER: x &= ~0xF; y &= ~0xF; break;
01605     case TRACK_LOWER: x |=  0xF; y |=  0xF; break;
01606     case TRACK_LEFT:  x |=  0xF; y &= ~0xF; break;
01607     case TRACK_RIGHT: x &= ~0xF; y |=  0xF; break;
01608     default: break;
01609   }
01610   return GetSlopeZ(x, y);
01611 }
01612 
01613 static void DrawSingleSignal(TileIndex tile, Track track, byte condition, uint image, uint pos)
01614 {
01615   bool side = (_settings_game.vehicle.road_side != 0) && _settings_game.construction.signal_side;
01616   static const Point SignalPositions[2][12] = {
01617     { // Signals on the left side
01618     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
01619       { 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
01620     /*  LOWER     LOWER     X         X         Y         Y     */
01621       {11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
01622     }, { // Signals on the right side
01623     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
01624       {14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
01625     /*  LOWER     LOWER     X         X         Y         Y     */
01626       {14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
01627     }
01628   };
01629 
01630   uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
01631   uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
01632 
01633   SpriteID sprite;
01634 
01635   SignalType type       = GetSignalType(tile, track);
01636   SignalVariant variant = GetSignalVariant(tile, track);
01637 
01638   if (type == SIGTYPE_NORMAL && variant == SIG_ELECTRIC) {
01639     /* Normal electric signals are picked from original sprites. */
01640     sprite = SPR_ORIGINAL_SIGNALS_BASE + image + condition;
01641   } else {
01642     /* All other signals are picked from add on sprites. */
01643     sprite = SPR_SIGNALS_BASE + (type - 1) * 16 + variant * 64 + image + condition + (type > SIGTYPE_LAST_NOPBS ? 64 : 0);
01644   }
01645 
01646   AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, GetSaveSlopeZ(x, y, track));
01647 }
01648 
01649 static uint32 _drawtile_track_palette;
01650 
01651 
01652 static void DrawTrackFence_NW(const TileInfo *ti, SpriteID base_image)
01653 {
01654   RailFenceOffset rfo = RFO_FLAT_X;
01655   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
01656   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01657     ti->x, ti->y + 1, 16, 1, 4, ti->z);
01658 }
01659 
01660 static void DrawTrackFence_SE(const TileInfo *ti, SpriteID base_image)
01661 {
01662   RailFenceOffset rfo = RFO_FLAT_X;
01663   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
01664   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01665     ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
01666 }
01667 
01668 static void DrawTrackFence_NW_SE(const TileInfo *ti, SpriteID base_image)
01669 {
01670   DrawTrackFence_NW(ti, base_image);
01671   DrawTrackFence_SE(ti, base_image);
01672 }
01673 
01674 static void DrawTrackFence_NE(const TileInfo *ti, SpriteID base_image)
01675 {
01676   RailFenceOffset rfo = RFO_FLAT_Y;
01677   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
01678   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01679     ti->x + 1, ti->y, 1, 16, 4, ti->z);
01680 }
01681 
01682 static void DrawTrackFence_SW(const TileInfo *ti, SpriteID base_image)
01683 {
01684   RailFenceOffset rfo = RFO_FLAT_Y;
01685   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
01686   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01687     ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
01688 }
01689 
01690 static void DrawTrackFence_NE_SW(const TileInfo *ti, SpriteID base_image)
01691 {
01692   DrawTrackFence_NE(ti, base_image);
01693   DrawTrackFence_SW(ti, base_image);
01694 }
01695 
01699 static void DrawTrackFence_NS_1(const TileInfo *ti, SpriteID base_image)
01700 {
01701   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_W);
01702   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
01703     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01704 }
01705 
01709 static void DrawTrackFence_NS_2(const TileInfo *ti, SpriteID base_image)
01710 {
01711   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_E);
01712   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
01713     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01714 }
01715 
01719 static void DrawTrackFence_WE_1(const TileInfo *ti, SpriteID base_image)
01720 {
01721   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_N);
01722   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
01723     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01724 }
01725 
01729 static void DrawTrackFence_WE_2(const TileInfo *ti, SpriteID base_image)
01730 {
01731   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_S);
01732   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
01733     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01734 }
01735 
01736 
01737 static void DrawTrackDetails(const TileInfo *ti, const RailtypeInfo *rti)
01738 {
01739   /* Base sprite for track fences. */
01740   SpriteID base_image = GetCustomRailSprite(rti, ti->tile, RTSG_FENCES);
01741   if (base_image == 0) base_image = SPR_TRACK_FENCE_FLAT_X;
01742 
01743   switch (GetRailGroundType(ti->tile)) {
01744     case RAIL_GROUND_FENCE_NW:     DrawTrackFence_NW(ti, base_image);    break;
01745     case RAIL_GROUND_FENCE_SE:     DrawTrackFence_SE(ti, base_image);    break;
01746     case RAIL_GROUND_FENCE_SENW:   DrawTrackFence_NW_SE(ti, base_image); break;
01747     case RAIL_GROUND_FENCE_NE:     DrawTrackFence_NE(ti, base_image);    break;
01748     case RAIL_GROUND_FENCE_SW:     DrawTrackFence_SW(ti, base_image);    break;
01749     case RAIL_GROUND_FENCE_NESW:   DrawTrackFence_NE_SW(ti, base_image); break;
01750     case RAIL_GROUND_FENCE_VERT1:  DrawTrackFence_NS_1(ti, base_image);  break;
01751     case RAIL_GROUND_FENCE_VERT2:  DrawTrackFence_NS_2(ti, base_image);  break;
01752     case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti, base_image);  break;
01753     case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti, base_image);  break;
01754     case RAIL_GROUND_WATER: {
01755       Corner track_corner;
01756       if (IsHalftileSlope(ti->tileh)) {
01757         /* Steep slope or one-corner-raised slope with halftile foundation */
01758         track_corner = GetHalftileSlopeCorner(ti->tileh);
01759       } else {
01760         /* Three-corner-raised slope */
01761         track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
01762       }
01763       switch (track_corner) {
01764         case CORNER_W: DrawTrackFence_NS_1(ti, base_image); break;
01765         case CORNER_S: DrawTrackFence_WE_2(ti, base_image); break;
01766         case CORNER_E: DrawTrackFence_NS_2(ti, base_image); break;
01767         case CORNER_N: DrawTrackFence_WE_1(ti, base_image); break;
01768         default: NOT_REACHED();
01769       }
01770       break;
01771     }
01772     default: break;
01773   }
01774 }
01775 
01776 /* SubSprite for drawing the track halftile of 'three-corners-raised'-sloped rail sprites. */
01777 static const int INF = 1000; // big number compared to tilesprite size
01778 static const SubSprite _halftile_sub_sprite[4] = {
01779   { -INF    , -INF  , 32 - 33, INF     }, // CORNER_W, clip 33 pixels from right
01780   { -INF    ,  0 + 7, INF    , INF     }, // CORNER_S, clip 7 pixels from top
01781   { -31 + 33, -INF  , INF    , INF     }, // CORNER_E, clip 33 pixels from left
01782   { -INF    , -INF  , INF    , 30 - 23 }  // CORNER_N, clip 23 pixels from bottom
01783 };
01784 
01785 static inline void DrawTrackSprite(SpriteID sprite, PaletteID pal, const TileInfo *ti, Slope s)
01786 {
01787   DrawGroundSprite(sprite, pal, NULL, 0, (ti->tileh & s) ? -8 : 0);
01788 }
01789 
01790 static void DrawTrackBitsOverlay(TileInfo *ti, TrackBits track, const RailtypeInfo *rti)
01791 {
01792   RailGroundType rgt = GetRailGroundType(ti->tile);
01793   Foundation f = GetRailFoundation(ti->tileh, track);
01794   Corner halftile_corner = CORNER_INVALID;
01795 
01796   if (IsNonContinuousFoundation(f)) {
01797     /* Save halftile corner */
01798     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
01799     /* Draw lower part first */
01800     track &= ~CornerToTrackBits(halftile_corner);
01801     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
01802   }
01803 
01804   DrawFoundation(ti, f);
01805   /* DrawFoundation modifies ti */
01806 
01807   /* Draw ground */
01808   if (track == TRACK_BIT_NONE && rgt == RAIL_GROUND_WATER) {
01809     if (IsSteepSlope(ti->tileh)) {
01810       DrawShoreTile(ti->tileh);
01811     } else {
01812       DrawGroundSprite(SPR_FLAT_WATER_TILE, PAL_NONE);
01813     }
01814   } else {
01815     SpriteID image;
01816 
01817     switch (rgt) {
01818       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
01819       case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
01820       default:                     image = SPR_FLAT_GRASS_TILE; break;
01821     }
01822 
01823     image += _tileh_to_sprite[ti->tileh];
01824 
01825     DrawGroundSprite(image, PAL_NONE);
01826   }
01827 
01828   SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
01829   SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
01830   TrackBits pbs = _settings_client.gui.show_track_reservation ? GetRailReservationTrackBits(ti->tile) : TRACK_BIT_NONE;
01831 
01832   if (track == TRACK_BIT_NONE) {
01833     /* Half-tile foundation, no track here? */
01834   } else if (ti->tileh == SLOPE_NW && track == TRACK_BIT_Y) {
01835     DrawGroundSprite(ground + RTO_SLOPE_NW, PAL_NONE);
01836     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 9, PALETTE_CRASH);
01837   } else if (ti->tileh == SLOPE_NE && track == TRACK_BIT_X) {
01838     DrawGroundSprite(ground + RTO_SLOPE_NE, PAL_NONE);
01839     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 6, PALETTE_CRASH);
01840   } else if (ti->tileh == SLOPE_SE && track == TRACK_BIT_Y) {
01841     DrawGroundSprite(ground + RTO_SLOPE_SE, PAL_NONE);
01842     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 7, PALETTE_CRASH);
01843   } else if (ti->tileh == SLOPE_SW && track == TRACK_BIT_X) {
01844     DrawGroundSprite(ground + RTO_SLOPE_SW, PAL_NONE);
01845     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 8, PALETTE_CRASH);
01846   } else {
01847     switch (track) {
01848       /* Draw single ground sprite when not overlapping. No track overlay
01849        * is necessary for these sprites. */
01850       case TRACK_BIT_X:     DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
01851       case TRACK_BIT_Y:     DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
01852       case TRACK_BIT_UPPER: DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N); break;
01853       case TRACK_BIT_LOWER: DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
01854       case TRACK_BIT_RIGHT: DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E); break;
01855       case TRACK_BIT_LEFT:  DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
01856       case TRACK_BIT_CROSS: DrawGroundSprite(ground + RTO_CROSSING_XY, PAL_NONE); break;
01857       case TRACK_BIT_HORZ:  DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N);
01858                             DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
01859       case TRACK_BIT_VERT:  DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E);
01860                             DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
01861 
01862       default:
01863         /* We're drawing a junction tile */
01864         if ((track & TRACK_BIT_3WAY_NE) == 0) {
01865           DrawGroundSprite(ground + RTO_JUNCTION_SW, PAL_NONE);
01866         } else if ((track & TRACK_BIT_3WAY_SW) == 0) {
01867           DrawGroundSprite(ground + RTO_JUNCTION_NE, PAL_NONE);
01868         } else if ((track & TRACK_BIT_3WAY_NW) == 0) {
01869           DrawGroundSprite(ground + RTO_JUNCTION_SE, PAL_NONE);
01870         } else if ((track & TRACK_BIT_3WAY_SE) == 0) {
01871           DrawGroundSprite(ground + RTO_JUNCTION_NW, PAL_NONE);
01872         } else {
01873           DrawGroundSprite(ground + RTO_JUNCTION_NSEW, PAL_NONE);
01874         }
01875 
01876         /* Mask out PBS bits as we shall draw them afterwards anyway. */
01877         track &= ~pbs;
01878 
01879         /* Draw regular track bits */
01880         if (track & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PAL_NONE);
01881         if (track & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PAL_NONE);
01882         if (track & TRACK_BIT_UPPER) DrawGroundSprite(overlay + RTO_N, PAL_NONE);
01883         if (track & TRACK_BIT_LOWER) DrawGroundSprite(overlay + RTO_S, PAL_NONE);
01884         if (track & TRACK_BIT_RIGHT) DrawGroundSprite(overlay + RTO_E, PAL_NONE);
01885         if (track & TRACK_BIT_LEFT)  DrawGroundSprite(overlay + RTO_W, PAL_NONE);
01886     }
01887 
01888     /* Draw reserved track bits */
01889     if (pbs & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH);
01890     if (pbs & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH);
01891     if (pbs & TRACK_BIT_UPPER) DrawTrackSprite(overlay + RTO_N, PALETTE_CRASH, ti, SLOPE_N);
01892     if (pbs & TRACK_BIT_LOWER) DrawTrackSprite(overlay + RTO_S, PALETTE_CRASH, ti, SLOPE_S);
01893     if (pbs & TRACK_BIT_RIGHT) DrawTrackSprite(overlay + RTO_E, PALETTE_CRASH, ti, SLOPE_E);
01894     if (pbs & TRACK_BIT_LEFT)  DrawTrackSprite(overlay + RTO_W, PALETTE_CRASH, ti, SLOPE_W);
01895   }
01896 
01897   if (IsValidCorner(halftile_corner)) {
01898     DrawFoundation(ti, HalftileFoundation(halftile_corner));
01899 
01900     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
01901     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
01902 
01903     SpriteID image;
01904     switch (rgt) {
01905       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
01906       case RAIL_GROUND_ICE_DESERT:
01907       case RAIL_GROUND_HALF_SNOW:  image = SPR_FLAT_SNOW_DESERT_TILE; break;
01908       default:                     image = SPR_FLAT_GRASS_TILE; break;
01909     }
01910 
01911     image += _tileh_to_sprite[fake_slope];
01912 
01913     DrawGroundSprite(image, PAL_NONE, &(_halftile_sub_sprite[halftile_corner]));
01914 
01915     track = CornerToTrackBits(halftile_corner);
01916 
01917     int offset;
01918     switch (track) {
01919       default: NOT_REACHED();
01920       case TRACK_BIT_UPPER: offset = RTO_N; break;
01921       case TRACK_BIT_LOWER: offset = RTO_S; break;
01922       case TRACK_BIT_RIGHT: offset = RTO_E; break;
01923       case TRACK_BIT_LEFT:  offset = RTO_W; break;
01924     }
01925 
01926     DrawTrackSprite(ground + offset, PAL_NONE, ti, fake_slope);
01927     if (HasReservedTracks(ti->tile, track)) {
01928       DrawTrackSprite(overlay + offset, PALETTE_CRASH, ti, fake_slope);
01929     }
01930   }
01931 }
01932 
01938 static void DrawTrackBits(TileInfo *ti, TrackBits track)
01939 {
01940   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
01941 
01942   if (rti->UsesOverlay()) {
01943     DrawTrackBitsOverlay(ti, track, rti);
01944     return;
01945   }
01946 
01947   RailGroundType rgt = GetRailGroundType(ti->tile);
01948   Foundation f = GetRailFoundation(ti->tileh, track);
01949   Corner halftile_corner = CORNER_INVALID;
01950 
01951   if (IsNonContinuousFoundation(f)) {
01952     /* Save halftile corner */
01953     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
01954     /* Draw lower part first */
01955     track &= ~CornerToTrackBits(halftile_corner);
01956     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
01957   }
01958 
01959   DrawFoundation(ti, f);
01960   /* DrawFoundation modifies ti */
01961 
01962   SpriteID image;
01963   PaletteID pal = PAL_NONE;
01964   const SubSprite *sub = NULL;
01965   bool junction = false;
01966 
01967   /* Select the sprite to use. */
01968   if (track == 0) {
01969     /* Clear ground (only track on halftile foundation) */
01970     if (rgt == RAIL_GROUND_WATER) {
01971       if (IsSteepSlope(ti->tileh)) {
01972         DrawShoreTile(ti->tileh);
01973         image = 0;
01974       } else {
01975         image = SPR_FLAT_WATER_TILE;
01976       }
01977     } else {
01978       switch (rgt) {
01979         case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
01980         case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
01981         default:                     image = SPR_FLAT_GRASS_TILE; break;
01982       }
01983       image += _tileh_to_sprite[ti->tileh];
01984     }
01985   } else {
01986     if (ti->tileh != SLOPE_FLAT) {
01987       /* track on non-flat ground */
01988       image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
01989     } else {
01990       /* track on flat ground */
01991       (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
01992       (image++,                           track == TRACK_BIT_X) ||
01993       (image++,                           track == TRACK_BIT_UPPER) ||
01994       (image++,                           track == TRACK_BIT_LOWER) ||
01995       (image++,                           track == TRACK_BIT_RIGHT) ||
01996       (image++,                           track == TRACK_BIT_LEFT) ||
01997       (image++,                           track == TRACK_BIT_CROSS) ||
01998 
01999       (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
02000       (image++,                            track == TRACK_BIT_VERT) ||
02001 
02002       (junction = true, false) ||
02003       (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
02004       (image++,                          (track & TRACK_BIT_3WAY_SW) == 0) ||
02005       (image++,                          (track & TRACK_BIT_3WAY_NW) == 0) ||
02006       (image++,                          (track & TRACK_BIT_3WAY_SE) == 0) ||
02007       (image++, true);
02008     }
02009 
02010     switch (rgt) {
02011       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
02012       case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset;  break;
02013       case RAIL_GROUND_WATER: {
02014         /* three-corner-raised slope */
02015         DrawShoreTile(ti->tileh);
02016         Corner track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
02017         sub = &(_halftile_sub_sprite[track_corner]);
02018         break;
02019       }
02020       default: break;
02021     }
02022   }
02023 
02024   if (image != 0) DrawGroundSprite(image, pal, sub);
02025 
02026   /* Draw track pieces individually for junction tiles */
02027   if (junction) {
02028     if (track & TRACK_BIT_X)     DrawGroundSprite(rti->base_sprites.single_x, PAL_NONE);
02029     if (track & TRACK_BIT_Y)     DrawGroundSprite(rti->base_sprites.single_y, PAL_NONE);
02030     if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PAL_NONE);
02031     if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PAL_NONE);
02032     if (track & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PAL_NONE);
02033     if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PAL_NONE);
02034   }
02035 
02036   /* PBS debugging, draw reserved tracks darker */
02037   if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation) {
02038     /* Get reservation, but mask track on halftile slope */
02039     TrackBits pbs = GetRailReservationTrackBits(ti->tile) & track;
02040     if (pbs & TRACK_BIT_X) {
02041       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
02042         DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH);
02043       } else {
02044         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
02045       }
02046     }
02047     if (pbs & TRACK_BIT_Y) {
02048       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
02049         DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH);
02050       } else {
02051         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
02052       }
02053     }
02054     if (pbs & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_N ? -TILE_HEIGHT : 0);
02055     if (pbs & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_S ? -TILE_HEIGHT : 0);
02056     if (pbs & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_W ? -TILE_HEIGHT : 0);
02057     if (pbs & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_E ? -TILE_HEIGHT : 0);
02058   }
02059 
02060   if (IsValidCorner(halftile_corner)) {
02061     DrawFoundation(ti, HalftileFoundation(halftile_corner));
02062 
02063     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
02064     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
02065     image = _track_sloped_sprites[fake_slope - 1] + rti->base_sprites.track_y;
02066     pal = PAL_NONE;
02067     switch (rgt) {
02068       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
02069       case RAIL_GROUND_ICE_DESERT:
02070       case RAIL_GROUND_HALF_SNOW:  image += rti->snow_offset;  break; // higher part has snow in this case too
02071       default: break;
02072     }
02073     DrawGroundSprite(image, pal, &(_halftile_sub_sprite[halftile_corner]));
02074 
02075     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, CornerToTrackBits(halftile_corner))) {
02076       static const byte _corner_to_track_sprite[] = {3, 1, 2, 0};
02077       DrawGroundSprite(_corner_to_track_sprite[halftile_corner] + rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, -TILE_HEIGHT);
02078     }
02079   }
02080 }
02081 
02087 enum {
02088   SIGNAL_TO_SOUTHWEST =  0,
02089   SIGNAL_TO_NORTHEAST =  2,
02090   SIGNAL_TO_SOUTHEAST =  4,
02091   SIGNAL_TO_NORTHWEST =  6,
02092   SIGNAL_TO_EAST      =  8,
02093   SIGNAL_TO_WEST      = 10,
02094   SIGNAL_TO_SOUTH     = 12,
02095   SIGNAL_TO_NORTH     = 14,
02096 };
02097 
02098 static void DrawSignals(TileIndex tile, TrackBits rails)
02099 {
02100 #define MAYBE_DRAW_SIGNAL(x, y, z, t) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, t, GetSingleSignalState(tile, x), y, z)
02101 
02102   if (!(rails & TRACK_BIT_Y)) {
02103     if (!(rails & TRACK_BIT_X)) {
02104       if (rails & TRACK_BIT_LEFT) {
02105         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTH, 0, TRACK_LEFT);
02106         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTH, 1, TRACK_LEFT);
02107       }
02108       if (rails & TRACK_BIT_RIGHT) {
02109         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_NORTH, 2, TRACK_RIGHT);
02110         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_SOUTH, 3, TRACK_RIGHT);
02111       }
02112       if (rails & TRACK_BIT_UPPER) {
02113         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_WEST, 4, TRACK_UPPER);
02114         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_EAST, 5, TRACK_UPPER);
02115       }
02116       if (rails & TRACK_BIT_LOWER) {
02117         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_WEST, 6, TRACK_LOWER);
02118         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_EAST, 7, TRACK_LOWER);
02119       }
02120     } else {
02121       MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHWEST, 8, TRACK_X);
02122       MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHEAST, 9, TRACK_X);
02123     }
02124   } else {
02125     MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHEAST, 10, TRACK_Y);
02126     MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHWEST, 11, TRACK_Y);
02127   }
02128 }
02129 
02130 static void DrawTile_Track(TileInfo *ti)
02131 {
02132   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
02133 
02134   _drawtile_track_palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
02135 
02136   if (IsPlainRail(ti->tile)) {
02137     TrackBits rails = GetTrackBits(ti->tile);
02138 
02139     DrawTrackBits(ti, rails);
02140 
02141     if (HasBit(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti, rti);
02142 
02143     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
02144 
02145     if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
02146   } else {
02147     /* draw depot */
02148     const DrawTileSprites *dts;
02149     PaletteID pal = PAL_NONE;
02150     SpriteID relocation;
02151 
02152     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
02153 
02154     if (IsInvisibilitySet(TO_BUILDINGS)) {
02155       /* Draw rail instead of depot */
02156       dts = &_depot_invisible_gfx_table[GetRailDepotDirection(ti->tile)];
02157     } else {
02158       dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
02159     }
02160 
02161     SpriteID image;
02162     if (rti->UsesOverlay()) {
02163       image = SPR_FLAT_GRASS_TILE;
02164     } else {
02165       image = dts->ground.sprite;
02166       if (image != SPR_FLAT_GRASS_TILE) image += rti->total_offset;
02167     }
02168 
02169     /* adjust ground tile for desert
02170      * don't adjust for snow, because snow in depots looks weird */
02171     if (IsSnowRailGround(ti->tile) && _settings_game.game_creation.landscape == LT_TROPIC) {
02172       if (image != SPR_FLAT_GRASS_TILE) {
02173         image += rti->snow_offset; // tile with tracks
02174       } else {
02175         image = SPR_FLAT_SNOW_DESERT_TILE; // flat ground
02176       }
02177     }
02178 
02179     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, _drawtile_track_palette));
02180 
02181     if (rti->UsesOverlay()) {
02182       SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
02183 
02184       switch (GetRailDepotDirection(ti->tile)) {
02185         case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02186         case DIAGDIR_SW: DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
02187         case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02188         case DIAGDIR_SE: DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
02189         default: break;
02190       }
02191 
02192       if (_settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
02193         SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
02194 
02195         switch (GetRailDepotDirection(ti->tile)) {
02196           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02197           case DIAGDIR_SW: DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH); break;
02198           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02199           case DIAGDIR_SE: DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH); break;
02200           default: break;
02201         }
02202       }
02203 
02204       relocation  = GetCustomRailSprite(rti, ti->tile, RTSG_DEPOT);
02205       relocation -= SPR_RAIL_DEPOT_SE_1;
02206     } else {
02207       /* PBS debugging, draw reserved tracks darker */
02208       if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
02209         switch (GetRailDepotDirection(ti->tile)) {
02210           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02211           case DIAGDIR_SW: DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH); break;
02212           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
02213           case DIAGDIR_SE: DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH); break;
02214           default: break;
02215         }
02216       }
02217 
02218       relocation = rti->total_offset;
02219     }
02220 
02221     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
02222 
02223     DrawRailTileSeq(ti, dts, TO_BUILDINGS, relocation, 0, _drawtile_track_palette);
02224   }
02225   DrawBridgeMiddle(ti);
02226 }
02227 
02228 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
02229 {
02230   const DrawTileSprites *dts = &_depot_gfx_table[dir];
02231   const RailtypeInfo *rti = GetRailTypeInfo(railtype);
02232   SpriteID image = rti->UsesOverlay() ? SPR_FLAT_GRASS_TILE : dts->ground.sprite;
02233   uint32 offset = rti->total_offset;
02234 
02235   x += 33;
02236   y += 17;
02237 
02238   if (image != SPR_FLAT_GRASS_TILE) image += offset;
02239   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
02240 
02241   DrawSprite(image, PAL_NONE, x, y);
02242 
02243   if (rti->UsesOverlay()) {
02244     SpriteID ground = GetCustomRailSprite(rti, INVALID_TILE, RTSG_GROUND);
02245 
02246     switch (dir) {
02247       case DIAGDIR_SW: DrawSprite(ground + RTO_X, PAL_NONE, x, y); break;
02248       case DIAGDIR_SE: DrawSprite(ground + RTO_Y, PAL_NONE, x, y); break;
02249       default: break;
02250     }
02251 
02252     offset  = GetCustomRailSprite(rti, INVALID_TILE, RTSG_DEPOT);
02253     offset -= SPR_RAIL_DEPOT_SE_1;
02254   }
02255 
02256   DrawRailTileSeqInGUI(x, y, dts, offset, 0, palette);
02257 }
02258 
02259 static uint GetSlopeZ_Track(TileIndex tile, uint x, uint y)
02260 {
02261   uint z;
02262   Slope tileh = GetTileSlope(tile, &z);
02263 
02264   if (tileh == SLOPE_FLAT) return z;
02265   if (IsPlainRail(tile)) {
02266     z += ApplyFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
02267     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
02268   } else {
02269     return z + TILE_HEIGHT;
02270   }
02271 }
02272 
02273 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
02274 {
02275   return IsPlainRail(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
02276 }
02277 
02278 static void TileLoop_Track(TileIndex tile)
02279 {
02280   RailGroundType old_ground = GetRailGroundType(tile);
02281   RailGroundType new_ground;
02282 
02283   if (old_ground == RAIL_GROUND_WATER) {
02284     TileLoop_Water(tile);
02285     return;
02286   }
02287 
02288   switch (_settings_game.game_creation.landscape) {
02289     case LT_ARCTIC: {
02290       uint z;
02291       Slope slope = GetTileSlope(tile, &z);
02292       bool half = false;
02293 
02294       /* for non-flat track, use lower part of track
02295        * in other cases, use the highest part with track */
02296       if (IsPlainRail(tile)) {
02297         TrackBits track = GetTrackBits(tile);
02298         Foundation f = GetRailFoundation(slope, track);
02299 
02300         switch (f) {
02301           case FOUNDATION_NONE:
02302             /* no foundation - is the track on the upper side of three corners raised tile? */
02303             if (IsSlopeWithThreeCornersRaised(slope)) z += TILE_HEIGHT;
02304             break;
02305 
02306           case FOUNDATION_INCLINED_X:
02307           case FOUNDATION_INCLINED_Y:
02308             /* sloped track - is it on a steep slope? */
02309             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
02310             break;
02311 
02312           case FOUNDATION_STEEP_LOWER:
02313             /* only lower part of steep slope */
02314             z += TILE_HEIGHT;
02315             break;
02316 
02317           default:
02318             /* if it is a steep slope, then there is a track on higher part */
02319             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
02320             z += TILE_HEIGHT;
02321             break;
02322         }
02323 
02324         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
02325       } else {
02326         /* is the depot on a non-flat tile? */
02327         if (slope != SLOPE_FLAT) z += TILE_HEIGHT;
02328       }
02329 
02330       /* 'z' is now the lowest part of the highest track bit -
02331        * for sloped track, it is 'z' of lower part
02332        * for two track bits, it is 'z' of higher track bit
02333        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
02334       if (z > GetSnowLine()) {
02335         if (half && z - GetSnowLine() == TILE_HEIGHT) {
02336           /* track on non-continuous foundation, lower part is not under snow */
02337           new_ground = RAIL_GROUND_HALF_SNOW;
02338         } else {
02339           new_ground = RAIL_GROUND_ICE_DESERT;
02340         }
02341         goto set_ground;
02342       }
02343       break;
02344       }
02345 
02346     case LT_TROPIC:
02347       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
02348         new_ground = RAIL_GROUND_ICE_DESERT;
02349         goto set_ground;
02350       }
02351       break;
02352   }
02353 
02354   if (!IsPlainRail(tile)) return;
02355 
02356   new_ground = RAIL_GROUND_GRASS;
02357 
02358   if (old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
02359     /* determine direction of fence */
02360     TrackBits rail = GetTrackBits(tile);
02361 
02362     switch (rail) {
02363       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
02364       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
02365       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
02366       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
02367 
02368       default: {
02369         Owner owner = GetTileOwner(tile);
02370 
02371         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
02372               (rail & TRACK_BIT_3WAY_NW) == 0 &&
02373               (rail & TRACK_BIT_X)
02374             )) {
02375           TileIndex n = tile + TileDiffXY(0, -1);
02376           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02377 
02378           if (!IsTileType(n, MP_RAILWAY) ||
02379               !IsTileOwner(n, owner) ||
02380               nrail == TRACK_BIT_UPPER ||
02381               nrail == TRACK_BIT_LEFT) {
02382             new_ground = RAIL_GROUND_FENCE_NW;
02383           }
02384         }
02385 
02386         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
02387               (rail & TRACK_BIT_3WAY_SE) == 0 &&
02388               (rail & TRACK_BIT_X)
02389             )) {
02390           TileIndex n = tile + TileDiffXY(0, 1);
02391           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02392 
02393           if (!IsTileType(n, MP_RAILWAY) ||
02394               !IsTileOwner(n, owner) ||
02395               nrail == TRACK_BIT_LOWER ||
02396               nrail == TRACK_BIT_RIGHT) {
02397             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
02398               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
02399           }
02400         }
02401 
02402         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
02403               (rail & TRACK_BIT_3WAY_NE) == 0 &&
02404               (rail & TRACK_BIT_Y)
02405             )) {
02406           TileIndex n = tile + TileDiffXY(-1, 0);
02407           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02408 
02409           if (!IsTileType(n, MP_RAILWAY) ||
02410               !IsTileOwner(n, owner) ||
02411               nrail == TRACK_BIT_UPPER ||
02412               nrail == TRACK_BIT_RIGHT) {
02413             new_ground = RAIL_GROUND_FENCE_NE;
02414           }
02415         }
02416 
02417         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
02418               (rail & TRACK_BIT_3WAY_SW) == 0 &&
02419               (rail & TRACK_BIT_Y)
02420             )) {
02421           TileIndex n = tile + TileDiffXY(1, 0);
02422           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02423 
02424           if (!IsTileType(n, MP_RAILWAY) ||
02425               !IsTileOwner(n, owner) ||
02426               nrail == TRACK_BIT_LOWER ||
02427               nrail == TRACK_BIT_LEFT) {
02428             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
02429               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
02430           }
02431         }
02432         break;
02433       }
02434     }
02435   }
02436 
02437 set_ground:
02438   if (old_ground != new_ground) {
02439     SetRailGroundType(tile, new_ground);
02440     MarkTileDirtyByTile(tile);
02441   }
02442 }
02443 
02444 
02445 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
02446 {
02447   /* Case of half tile slope with water. */
02448   if (mode == TRANSPORT_WATER && IsPlainRail(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
02449     TrackBits tb = GetTrackBits(tile);
02450     switch (tb) {
02451       default: NOT_REACHED();
02452       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
02453       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
02454       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
02455       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
02456     }
02457     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
02458   }
02459 
02460   if (mode != TRANSPORT_RAIL) return 0;
02461 
02462   TrackBits trackbits = TRACK_BIT_NONE;
02463   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
02464 
02465   switch (GetRailTileType(tile)) {
02466     default: NOT_REACHED();
02467     case RAIL_TILE_NORMAL:
02468       trackbits = GetTrackBits(tile);
02469       break;
02470 
02471     case RAIL_TILE_SIGNALS: {
02472       trackbits = GetTrackBits(tile);
02473       byte a = GetPresentSignals(tile);
02474       uint b = GetSignalStates(tile);
02475 
02476       b &= a;
02477 
02478       /* When signals are not present (in neither direction),
02479        * we pretend them to be green. Otherwise, it depends on
02480        * the signal type. For signals that are only active from
02481        * one side, we set the missing signals explicitely to
02482        * `green'. Otherwise, they implicitely become `red'. */
02483       if (!IsOnewaySignal(tile, TRACK_UPPER) || (a & SignalOnTrack(TRACK_UPPER)) == 0) b |= ~a & SignalOnTrack(TRACK_UPPER);
02484       if (!IsOnewaySignal(tile, TRACK_LOWER) || (a & SignalOnTrack(TRACK_LOWER)) == 0) b |= ~a & SignalOnTrack(TRACK_LOWER);
02485 
02486       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
02487       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
02488       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
02489       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
02490 
02491       break;
02492     }
02493 
02494     case RAIL_TILE_DEPOT: {
02495       DiagDirection dir = GetRailDepotDirection(tile);
02496 
02497       if (side != INVALID_DIAGDIR && side != dir) break;
02498 
02499       trackbits = DiagDirToDiagTrackBits(dir);
02500       break;
02501     }
02502   }
02503 
02504   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
02505 }
02506 
02507 static bool ClickTile_Track(TileIndex tile)
02508 {
02509   if (!IsRailDepot(tile)) return false;
02510 
02511   ShowDepotWindow(tile, VEH_TRAIN);
02512   return true;
02513 }
02514 
02515 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
02516 {
02517   td->owner[0] = GetTileOwner(tile);
02518   switch (GetRailTileType(tile)) {
02519     case RAIL_TILE_NORMAL:
02520       td->str = STR_LAI_RAIL_DESCRIPTION_TRACK;
02521       break;
02522 
02523     case RAIL_TILE_SIGNALS: {
02524       static const StringID signal_type[6][6] = {
02525         {
02526           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_SIGNALS,
02527           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
02528           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
02529           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
02530           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
02531           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS
02532         },
02533         {
02534           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
02535           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRESIGNALS,
02536           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
02537           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
02538           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
02539           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS
02540         },
02541         {
02542           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
02543           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
02544           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXITSIGNALS,
02545           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
02546           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
02547           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS
02548         },
02549         {
02550           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
02551           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
02552           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
02553           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBOSIGNALS,
02554           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
02555           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS
02556         },
02557         {
02558           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
02559           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
02560           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
02561           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
02562           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBSSIGNALS,
02563           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS
02564         },
02565         {
02566           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS,
02567           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS,
02568           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS,
02569           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS,
02570           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS,
02571           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NOENTRYSIGNALS
02572         }
02573       };
02574 
02575       SignalType primary_signal;
02576       SignalType secondary_signal;
02577       if (HasSignalOnTrack(tile, TRACK_UPPER)) {
02578         primary_signal = GetSignalType(tile, TRACK_UPPER);
02579         secondary_signal = HasSignalOnTrack(tile, TRACK_LOWER) ? GetSignalType(tile, TRACK_LOWER) : primary_signal;
02580       } else {
02581         secondary_signal = primary_signal = GetSignalType(tile, TRACK_LOWER);
02582       }
02583 
02584       td->str = signal_type[secondary_signal][primary_signal];
02585       break;
02586     }
02587 
02588     case RAIL_TILE_DEPOT:
02589       td->str = STR_LAI_RAIL_DESCRIPTION_TRAIN_DEPOT;
02590       break;
02591 
02592     default:
02593       NOT_REACHED();
02594   }
02595 }
02596 
02597 static void ChangeTileOwner_Track(TileIndex tile, Owner old_owner, Owner new_owner)
02598 {
02599   if (!IsTileOwner(tile, old_owner)) return;
02600 
02601   if (new_owner != INVALID_OWNER) {
02602     SetTileOwner(tile, new_owner);
02603   } else {
02604     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
02605   }
02606 }
02607 
02608 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
02609 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
02610 static const int8 _deltacoord_leaveoffset[8] = {
02611   -1,  0,  1,  0, /* x */
02612    0,  1,  0, -1  /* y */
02613 };
02614 
02615 
02621 int TicksToLeaveDepot(const Train *v)
02622 {
02623   DiagDirection dir = GetRailDepotDirection(v->tile);
02624   int length = v->tcache.cached_veh_length;
02625 
02626   switch (dir) {
02627     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
02628     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
02629     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
02630     default:
02631     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
02632   }
02633 
02634   return 0; // make compilers happy
02635 }
02636 
02639 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *u, TileIndex tile, int x, int y)
02640 {
02641   /* this routine applies only to trains in depot tiles */
02642   if (u->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
02643 
02644   Train *v = Train::From(u);
02645 
02646   /* depot direction */
02647   DiagDirection dir = GetRailDepotDirection(tile);
02648 
02649   /* calculate the point where the following wagon should be activated
02650    * this depends on the length of the current vehicle */
02651   int length = v->tcache.cached_veh_length;
02652 
02653   byte fract_coord_leave =
02654     ((_fractcoords_enter[dir] & 0x0F) + // x
02655       (length + 1) * _deltacoord_leaveoffset[dir]) +
02656     (((_fractcoords_enter[dir] >> 4) +  // y
02657       ((length + 1) * _deltacoord_leaveoffset[dir + 4])) << 4);
02658 
02659   byte fract_coord = (x & 0xF) + ((y & 0xF) << 4);
02660 
02661   if (_fractcoords_behind[dir] == fract_coord) {
02662     /* make sure a train is not entering the tile from behind */
02663     return VETSB_CANNOT_ENTER;
02664   } else if (_fractcoords_enter[dir] == fract_coord) {
02665     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
02666       /* enter the depot */
02667       v->track = TRACK_BIT_DEPOT,
02668       v->vehstatus |= VS_HIDDEN; // hide it
02669       v->direction = ReverseDir(v->direction);
02670       if (v->Next() == NULL) VehicleEnterDepot(v->First());
02671       v->tile = tile;
02672 
02673       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
02674       return VETSB_ENTERED_WORMHOLE;
02675     }
02676   } else if (fract_coord_leave == fract_coord) {
02677     if (DiagDirToDir(dir) == v->direction) {
02678       /* leave the depot? */
02679       if ((v = v->Next()) != NULL) {
02680         v->vehstatus &= ~VS_HIDDEN;
02681         v->track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
02682       }
02683     }
02684   }
02685 
02686   return VETSB_CONTINUE;
02687 }
02688 
02700 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, uint z_old, Slope tileh_old, uint z_new, Slope tileh_new, TrackBits rail_bits)
02701 {
02702   if (!_settings_game.construction.build_on_slopes || !AutoslopeEnabled()) return CMD_ERROR;
02703 
02704   /* Is the slope-rail_bits combination valid in general? I.e. is it safe to call GetRailFoundation() ? */
02705   if (CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile).Failed()) return CMD_ERROR;
02706 
02707   /* Get the slopes on top of the foundations */
02708   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
02709   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
02710 
02711   Corner track_corner;
02712   switch (rail_bits) {
02713     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
02714     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
02715     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
02716     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
02717 
02718     /* Surface slope must not be changed */
02719     default: return (((z_old != z_new) || (tileh_old != tileh_new)) ? CMD_ERROR : CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]));
02720   }
02721 
02722   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
02723   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
02724   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
02725   if (z_old != z_new) return CMD_ERROR;
02726 
02727   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
02728   /* Make the ground dirty, if surface slope has changed */
02729   if (tileh_old != tileh_new) {
02730     /* If there is flat water on the lower halftile add the cost for clearing it */
02731     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price[PR_CLEAR_WATER]);
02732     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
02733   }
02734   return  cost;
02735 }
02736 
02737 static CommandCost TerraformTile_Track(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
02738 {
02739   uint z_old;
02740   Slope tileh_old = GetTileSlope(tile, &z_old);
02741   if (IsPlainRail(tile)) {
02742     TrackBits rail_bits = GetTrackBits(tile);
02743     /* Is there flat water on the lower halftile, that must be cleared expensively? */
02744     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
02745 
02746     _error_message = STR_ERROR_MUST_REMOVE_RAILROAD_TRACK;
02747 
02748     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
02749     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
02750 
02751     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
02752     Corner allowed_corner;
02753     switch (rail_bits) {
02754       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
02755       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
02756       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
02757       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
02758       default: return autoslope_result;
02759     }
02760 
02761     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
02762 
02763     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
02764     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
02765 
02766     /* Everything is valid, which only changes allowed_corner */
02767     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
02768       if (allowed_corner == corner) continue;
02769       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
02770     }
02771 
02772     /* Make the ground dirty */
02773     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
02774 
02775     /* allow terraforming */
02776     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price[PR_CLEAR_WATER] : (Money)0);
02777   } else if (_settings_game.construction.build_on_slopes && AutoslopeEnabled() &&
02778       AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) {
02779     return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
02780   }
02781   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
02782 }
02783 
02784 
02785 extern const TileTypeProcs _tile_type_rail_procs = {
02786   DrawTile_Track,           // draw_tile_proc
02787   GetSlopeZ_Track,          // get_slope_z_proc
02788   ClearTile_Track,          // clear_tile_proc
02789   NULL,                     // add_accepted_cargo_proc
02790   GetTileDesc_Track,        // get_tile_desc_proc
02791   GetTileTrackStatus_Track, // get_tile_track_status_proc
02792   ClickTile_Track,          // click_tile_proc
02793   NULL,                     // animate_tile_proc
02794   TileLoop_Track,           // tile_loop_clear
02795   ChangeTileOwner_Track,    // change_tile_owner_clear
02796   NULL,                     // add_produced_cargo_proc
02797   VehicleEnter_Track,       // vehicle_enter_tile_proc
02798   GetFoundation_Track,      // get_foundation_proc
02799   TerraformTile_Track,      // terraform_tile_proc
02800 };

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