rail_cmd.cpp

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00001 /* $Id: rail_cmd.cpp 18509 2009-12-15 13:59:20Z peter1138 $ */
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 "openttd.h"
00014 #include "cmd_helper.h"
00015 #include "landscape.h"
00016 #include "viewport_func.h"
00017 #include "command_func.h"
00018 #include "engine_base.h"
00019 #include "depot_base.h"
00020 #include "pathfinder/yapf/yapf_cache.h"
00021 #include "newgrf_engine.h"
00022 #include "landscape_type.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 
00038 #include "table/strings.h"
00039 #include "table/railtypes.h"
00040 #include "table/track_land.h"
00041 
00042 RailtypeInfo _railtypes[RAILTYPE_END];
00043 
00044 assert_compile(sizeof(_original_railtypes) <= sizeof(_railtypes));
00045 
00049 void ResetRailTypes()
00050 {
00051   memset(_railtypes, 0, sizeof(_railtypes));
00052   memcpy(_railtypes, _original_railtypes, sizeof(_original_railtypes));
00053 }
00054 
00055 static const byte _track_sloped_sprites[14] = {
00056   14, 15, 22, 13,
00057    0, 21, 17, 12,
00058   23,  0, 18, 20,
00059   19, 16
00060 };
00061 
00062 
00063 /*         4
00064  *     ---------
00065  *    |\       /|
00066  *    | \    1/ |
00067  *    |  \   /  |
00068  *    |   \ /   |
00069  *  16|    \    |32
00070  *    |   / \2  |
00071  *    |  /   \  |
00072  *    | /     \ |
00073  *    |/       \|
00074  *     ---------
00075  *         8
00076  */
00077 
00078 
00079 
00080 /* MAP2 byte:    abcd???? => Signal On? Same coding as map3lo
00081  * MAP3LO byte:  abcd???? => Signal Exists?
00082  *               a and b are for diagonals, upper and left,
00083  *               one for each direction. (ie a == NE->SW, b ==
00084  *               SW->NE, or v.v., I don't know. b and c are
00085  *               similar for lower and right.
00086  * MAP2 byte:    ????abcd => Type of ground.
00087  * MAP3LO byte:  ????abcd => Type of rail.
00088  * MAP5:         00abcdef => rail
00089  *               01abcdef => rail w/ signals
00090  *               10uuuuuu => unused
00091  *               11uuuudd => rail depot
00092  */
00093 
00094 
00095 Vehicle *EnsureNoTrainOnTrackProc(Vehicle *v, void *data)
00096 {
00097   TrackBits rail_bits = *(TrackBits *)data;
00098 
00099   if (v->type != VEH_TRAIN) return NULL;
00100 
00101   Train *t = Train::From(v);
00102   if ((t->track != rail_bits) && !TracksOverlap(t->track | rail_bits)) return NULL;
00103 
00104   _error_message = STR_ERROR_TRAIN_IN_THE_WAY + v->type;
00105   return v;
00106 }
00107 
00115 static bool EnsureNoTrainOnTrack(TileIndex tile, Track track)
00116 {
00117   TrackBits rail_bits = TrackToTrackBits(track);
00118 
00119   return !HasVehicleOnPos(tile, &rail_bits, &EnsureNoTrainOnTrackProc);
00120 }
00121 
00122 static bool CheckTrackCombination(TileIndex tile, TrackBits to_build, uint flags)
00123 {
00124   TrackBits current; // The current track layout
00125   TrackBits future;  // The track layout we want to build
00126   _error_message = STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION;
00127 
00128   if (!IsPlainRail(tile)) return false;
00129 
00130   /* So, we have a tile with tracks on it (and possibly signals). Let's see
00131    * what tracks first */
00132   current = GetTrackBits(tile);
00133   future = current | to_build;
00134 
00135   /* Are we really building something new? */
00136   if (current == future) {
00137     /* Nothing new is being built */
00138     _error_message = STR_ERROR_ALREADY_BUILT;
00139     return false;
00140   }
00141 
00142   /* Let's see if we may build this */
00143   if ((flags & DC_NO_RAIL_OVERLAP) || HasSignals(tile)) {
00144     /* If we are not allowed to overlap (flag is on for ai companies or we have
00145      * signals on the tile), check that */
00146     return future == TRACK_BIT_HORZ || future == TRACK_BIT_VERT;
00147   } else {
00148     /* Normally, we may overlap and any combination is valid */
00149     return true;
00150   }
00151 }
00152 
00153 
00155 static const TrackBits _valid_tracks_without_foundation[15] = {
00156   TRACK_BIT_ALL,
00157   TRACK_BIT_RIGHT,
00158   TRACK_BIT_UPPER,
00159   TRACK_BIT_X,
00160 
00161   TRACK_BIT_LEFT,
00162   TRACK_BIT_NONE,
00163   TRACK_BIT_Y,
00164   TRACK_BIT_LOWER,
00165 
00166   TRACK_BIT_LOWER,
00167   TRACK_BIT_Y,
00168   TRACK_BIT_NONE,
00169   TRACK_BIT_LEFT,
00170 
00171   TRACK_BIT_X,
00172   TRACK_BIT_UPPER,
00173   TRACK_BIT_RIGHT,
00174 };
00175 
00177 static const TrackBits _valid_tracks_on_leveled_foundation[15] = {
00178   TRACK_BIT_NONE,
00179   TRACK_BIT_LEFT,
00180   TRACK_BIT_LOWER,
00181   TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,
00182 
00183   TRACK_BIT_RIGHT,
00184   TRACK_BIT_ALL,
00185   TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,
00186   TRACK_BIT_ALL,
00187 
00188   TRACK_BIT_UPPER,
00189   TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,
00190   TRACK_BIT_ALL,
00191   TRACK_BIT_ALL,
00192 
00193   TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,
00194   TRACK_BIT_ALL,
00195   TRACK_BIT_ALL
00196 };
00197 
00205 Foundation GetRailFoundation(Slope tileh, TrackBits bits)
00206 {
00207   if (bits == TRACK_BIT_NONE) return FOUNDATION_NONE;
00208 
00209   if (IsSteepSlope(tileh)) {
00210     /* Test for inclined foundations */
00211     if (bits == TRACK_BIT_X) return FOUNDATION_INCLINED_X;
00212     if (bits == TRACK_BIT_Y) return FOUNDATION_INCLINED_Y;
00213 
00214     /* Get higher track */
00215     Corner highest_corner = GetHighestSlopeCorner(tileh);
00216     TrackBits higher_track = CornerToTrackBits(highest_corner);
00217 
00218     /* Only higher track? */
00219     if (bits == higher_track) return HalftileFoundation(highest_corner);
00220 
00221     /* Overlap with higher track? */
00222     if (TracksOverlap(bits | higher_track)) return FOUNDATION_INVALID;
00223 
00224     /* either lower track or both higher and lower track */
00225     return ((bits & higher_track) != 0 ? FOUNDATION_STEEP_BOTH : FOUNDATION_STEEP_LOWER);
00226   } else {
00227     if ((~_valid_tracks_without_foundation[tileh] & bits) == 0) return FOUNDATION_NONE;
00228 
00229     bool valid_on_leveled = ((~_valid_tracks_on_leveled_foundation[tileh] & bits) == 0);
00230 
00231     Corner track_corner;
00232     switch (bits) {
00233       case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
00234       case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
00235       case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
00236       case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
00237 
00238       case TRACK_BIT_HORZ:
00239         if (tileh == SLOPE_N) return HalftileFoundation(CORNER_N);
00240         if (tileh == SLOPE_S) return HalftileFoundation(CORNER_S);
00241         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00242 
00243       case TRACK_BIT_VERT:
00244         if (tileh == SLOPE_W) return HalftileFoundation(CORNER_W);
00245         if (tileh == SLOPE_E) return HalftileFoundation(CORNER_E);
00246         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00247 
00248       case TRACK_BIT_X:
00249         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_X;
00250         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00251 
00252       case TRACK_BIT_Y:
00253         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_Y;
00254         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00255 
00256       default:
00257         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00258     }
00259     /* Single diagonal track */
00260 
00261     /* Track must be at least valid on leveled foundation */
00262     if (!valid_on_leveled) return FOUNDATION_INVALID;
00263 
00264     /* If slope has three raised corners, build leveled foundation */
00265     if (IsSlopeWithThreeCornersRaised(tileh)) return FOUNDATION_LEVELED;
00266 
00267     /* If neighboured corners of track_corner are lowered, build halftile foundation */
00268     if ((tileh & SlopeWithThreeCornersRaised(OppositeCorner(track_corner))) == SlopeWithOneCornerRaised(track_corner)) return HalftileFoundation(track_corner);
00269 
00270     /* else special anti-zig-zag foundation */
00271     return SpecialRailFoundation(track_corner);
00272   }
00273 }
00274 
00275 
00285 static CommandCost CheckRailSlope(Slope tileh, TrackBits rail_bits, TrackBits existing, TileIndex tile)
00286 {
00287   /* don't allow building on the lower side of a coast */
00288   if (IsTileType(tile, MP_WATER) || (IsTileType(tile, MP_RAILWAY) && (GetRailGroundType(tile) == RAIL_GROUND_WATER))) {
00289     if (!IsSteepSlope(tileh) && ((~_valid_tracks_on_leveled_foundation[tileh] & (rail_bits | existing)) != 0)) return_cmd_error(STR_ERROR_CAN_T_BUILD_ON_WATER);
00290   }
00291 
00292   Foundation f_new = GetRailFoundation(tileh, rail_bits | existing);
00293 
00294   /* check track/slope combination */
00295   if ((f_new == FOUNDATION_INVALID) ||
00296       ((f_new != FOUNDATION_NONE) && (!_settings_game.construction.build_on_slopes))) {
00297     return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00298   }
00299 
00300   Foundation f_old = GetRailFoundation(tileh, existing);
00301   return CommandCost(EXPENSES_CONSTRUCTION, f_new != f_old ? _price[PR_BUILD_FOUNDATION] : (Money)0);
00302 }
00303 
00304 /* Validate functions for rail building */
00305 static inline bool ValParamTrackOrientation(Track track) {return IsValidTrack(track);}
00306 
00315 CommandCost CmdBuildSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00316 {
00317   Slope tileh;
00318   RailType railtype = (RailType)p1;
00319   Track track = (Track)p2;
00320   TrackBits trackbit;
00321   CommandCost cost(EXPENSES_CONSTRUCTION);
00322   CommandCost ret;
00323 
00324   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
00325 
00326   tileh = GetTileSlope(tile, NULL);
00327   trackbit = TrackToTrackBits(track);
00328 
00329   switch (GetTileType(tile)) {
00330     case MP_RAILWAY:
00331       if (!CheckTileOwnership(tile)) return CMD_ERROR;
00332 
00333       if (!IsPlainRail(tile)) return CMD_ERROR;
00334 
00335       if (!IsCompatibleRail(GetRailType(tile), railtype)) return_cmd_error(STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION);
00336 
00337       if (!CheckTrackCombination(tile, trackbit, flags) ||
00338           !EnsureNoTrainOnTrack(tile, track)) {
00339         return CMD_ERROR;
00340       }
00341 
00342       ret = CheckRailSlope(tileh, trackbit, GetTrackBits(tile), tile);
00343       if (CmdFailed(ret)) return ret;
00344       cost.AddCost(ret);
00345 
00346       /* If the rail types don't match, try to convert only if engines of
00347        * the new rail type are not powered on the present rail type and engines of
00348        * the present rail type are powered on the new rail type. */
00349       if (GetRailType(tile) != railtype && !HasPowerOnRail(railtype, GetRailType(tile))) {
00350         if (HasPowerOnRail(GetRailType(tile), railtype)) {
00351           ret = DoCommand(tile, tile, railtype, flags, CMD_CONVERT_RAIL);
00352           if (CmdFailed(ret)) return ret;
00353           cost.AddCost(ret);
00354         } else {
00355           return CMD_ERROR;
00356         }
00357       }
00358 
00359       if (flags & DC_EXEC) {
00360         SetRailGroundType(tile, RAIL_GROUND_BARREN);
00361         SetTrackBits(tile, GetTrackBits(tile) | trackbit);
00362       }
00363       break;
00364 
00365     case MP_ROAD:
00366 #define M(x) (1 << (x))
00367       /* Level crossings may only be built on these slopes */
00368       if (!HasBit(M(SLOPE_SEN) | M(SLOPE_ENW) | M(SLOPE_NWS) | M(SLOPE_NS) | M(SLOPE_WSE) | M(SLOPE_EW) | M(SLOPE_FLAT), tileh)) {
00369         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00370       }
00371 #undef M
00372 
00373       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00374 
00375       if (IsNormalRoad(tile)) {
00376         if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00377 
00378         if (GetDisallowedRoadDirections(tile) != DRD_NONE) return_cmd_error(STR_ERROR_CROSSING_ON_ONEWAY_ROAD);
00379 
00380         RoadTypes roadtypes = GetRoadTypes(tile);
00381         RoadBits road = GetRoadBits(tile, ROADTYPE_ROAD);
00382         RoadBits tram = GetRoadBits(tile, ROADTYPE_TRAM);
00383         switch (roadtypes) {
00384           default: break;
00385           case ROADTYPES_TRAM:
00386             /* Tram crossings must always have road. */
00387             if (flags & DC_EXEC) SetRoadOwner(tile, ROADTYPE_ROAD, _current_company);
00388             roadtypes |= ROADTYPES_ROAD;
00389             break;
00390 
00391           case ROADTYPES_ALL:
00392             if (road != tram) return CMD_ERROR;
00393             break;
00394         }
00395 
00396         road |= tram;
00397 
00398         if ((track == TRACK_X && road == ROAD_Y) ||
00399             (track == TRACK_Y && road == ROAD_X)) {
00400           if (flags & DC_EXEC) {
00401             MakeRoadCrossing(tile, GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), _current_company, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, roadtypes, GetTownIndex(tile));
00402             UpdateLevelCrossing(tile, false);
00403           }
00404           break;
00405         }
00406       }
00407 
00408       if (IsLevelCrossing(tile) && GetCrossingRailBits(tile) == trackbit) {
00409         return_cmd_error(STR_ERROR_ALREADY_BUILT);
00410       }
00411       /* FALLTHROUGH */
00412 
00413     default:
00414       /* Will there be flat water on the lower halftile? */
00415       bool water_ground = IsTileType(tile, MP_WATER) && IsSlopeWithOneCornerRaised(tileh);
00416 
00417       ret = CheckRailSlope(tileh, trackbit, TRACK_BIT_NONE, tile);
00418       if (CmdFailed(ret)) return ret;
00419       cost.AddCost(ret);
00420 
00421       ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00422       if (CmdFailed(ret)) return ret;
00423       cost.AddCost(ret);
00424 
00425       if (water_ground) {
00426         cost.AddCost(-_price[PR_CLEAR_WATER]);
00427         cost.AddCost(_price[PR_CLEAR_ROUGH]);
00428       }
00429 
00430       if (flags & DC_EXEC) {
00431         MakeRailNormal(tile, _current_company, trackbit, railtype);
00432         if (water_ground) SetRailGroundType(tile, RAIL_GROUND_WATER);
00433       }
00434       break;
00435   }
00436 
00437   if (flags & DC_EXEC) {
00438     MarkTileDirtyByTile(tile);
00439     AddTrackToSignalBuffer(tile, track, _current_company);
00440     YapfNotifyTrackLayoutChange(tile, track);
00441   }
00442 
00443   return cost.AddCost(RailBuildCost(railtype));
00444 }
00445 
00454 CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00455 {
00456   Track track = (Track)p2;
00457   TrackBits trackbit;
00458   CommandCost cost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_RAIL] );
00459   bool crossing = false;
00460 
00461   if (!ValParamTrackOrientation((Track)p2)) return CMD_ERROR;
00462   trackbit = TrackToTrackBits(track);
00463 
00464   /* Need to read tile owner now because it may change when the rail is removed
00465    * Also, in case of floods, _current_company != owner
00466    * There may be invalid tiletype even in exec run (when removing long track),
00467    * so do not call GetTileOwner(tile) in any case here */
00468   Owner owner = INVALID_OWNER;
00469 
00470   Train *v = NULL;
00471 
00472   switch (GetTileType(tile)) {
00473     case MP_ROAD: {
00474       if (!IsLevelCrossing(tile) ||
00475           GetCrossingRailBits(tile) != trackbit ||
00476           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
00477           (!(flags & DC_BANKRUPT) && !EnsureNoVehicleOnGround(tile))) {
00478         return CMD_ERROR;
00479       }
00480 
00481       if (flags & DC_EXEC) {
00482         if (HasReservedTracks(tile, trackbit)) {
00483           v = GetTrainForReservation(tile, track);
00484           if (v != NULL) FreeTrainTrackReservation(v);
00485         }
00486         owner = GetTileOwner(tile);
00487         MakeRoadNormal(tile, GetCrossingRoadBits(tile), GetRoadTypes(tile), GetTownIndex(tile), GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM));
00488       }
00489       break;
00490     }
00491 
00492     case MP_RAILWAY: {
00493       TrackBits present;
00494 
00495       if (!IsPlainRail(tile) ||
00496           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
00497           !EnsureNoTrainOnTrack(tile, track)) {
00498         return CMD_ERROR;
00499       }
00500 
00501       present = GetTrackBits(tile);
00502       if ((present & trackbit) == 0) return CMD_ERROR;
00503       if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
00504 
00505       /* Charge extra to remove signals on the track, if they are there */
00506       if (HasSignalOnTrack(tile, track))
00507         cost.AddCost(DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS));
00508 
00509       if (flags & DC_EXEC) {
00510         if (HasReservedTracks(tile, trackbit)) {
00511           v = GetTrainForReservation(tile, track);
00512           if (v != NULL) FreeTrainTrackReservation(v);
00513         }
00514         owner = GetTileOwner(tile);
00515         present ^= trackbit;
00516         if (present == 0) {
00517           Slope tileh = GetTileSlope(tile, NULL);
00518           /* If there is flat water on the lower halftile, convert the tile to shore so the water remains */
00519           if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh)) {
00520             MakeShore(tile);
00521           } else {
00522             DoClearSquare(tile);
00523           }
00524         } else {
00525           SetTrackBits(tile, present);
00526           SetTrackReservation(tile, GetRailReservationTrackBits(tile) & present);
00527         }
00528       }
00529       break;
00530     }
00531 
00532     default: return CMD_ERROR;
00533   }
00534 
00535   if (flags & DC_EXEC) {
00536     /* if we got that far, 'owner' variable is set correctly */
00537     assert(Company::IsValidID(owner));
00538 
00539     MarkTileDirtyByTile(tile);
00540     if (crossing) {
00541       /* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we
00542        * are removing one of these pieces, we'll need to update signals for
00543        * both directions explicitly, as after the track is removed it won't
00544        * 'connect' with the other piece. */
00545       AddTrackToSignalBuffer(tile, TRACK_X, owner);
00546       AddTrackToSignalBuffer(tile, TRACK_Y, owner);
00547       YapfNotifyTrackLayoutChange(tile, TRACK_X);
00548       YapfNotifyTrackLayoutChange(tile, TRACK_Y);
00549     } else {
00550       AddTrackToSignalBuffer(tile, track, owner);
00551       YapfNotifyTrackLayoutChange(tile, track);
00552     }
00553 
00554     if (v != NULL) TryPathReserve(v, true);
00555   }
00556 
00557   return cost;
00558 }
00559 
00560 
00568 bool FloodHalftile(TileIndex t)
00569 {
00570   assert(IsPlainRailTile(t));
00571 
00572   bool flooded = false;
00573   if (GetRailGroundType(t) == RAIL_GROUND_WATER) return flooded;
00574 
00575   Slope tileh = GetTileSlope(t, NULL);
00576   TrackBits rail_bits = GetTrackBits(t);
00577 
00578   if (IsSlopeWithOneCornerRaised(tileh)) {
00579     TrackBits lower_track = CornerToTrackBits(OppositeCorner(GetHighestSlopeCorner(tileh)));
00580 
00581     TrackBits to_remove = lower_track & rail_bits;
00582     if (to_remove != 0) {
00583       _current_company = OWNER_WATER;
00584       if (CmdFailed(DoCommand(t, 0, FIND_FIRST_BIT(to_remove), DC_EXEC, CMD_REMOVE_SINGLE_RAIL))) return flooded; // not yet floodable
00585       flooded = true;
00586       rail_bits = rail_bits & ~to_remove;
00587       if (rail_bits == 0) {
00588         MakeShore(t);
00589         MarkTileDirtyByTile(t);
00590         return flooded;
00591       }
00592     }
00593 
00594     if (IsNonContinuousFoundation(GetRailFoundation(tileh, rail_bits))) {
00595       flooded = true;
00596       SetRailGroundType(t, RAIL_GROUND_WATER);
00597       MarkTileDirtyByTile(t);
00598     }
00599   } else {
00600     /* Make shore on steep slopes and 'three-corners-raised'-slopes. */
00601     if (ApplyFoundationToSlope(GetRailFoundation(tileh, rail_bits), &tileh) == 0) {
00602       if (IsSteepSlope(tileh) || IsSlopeWithThreeCornersRaised(tileh)) {
00603         flooded = true;
00604         SetRailGroundType(t, RAIL_GROUND_WATER);
00605         MarkTileDirtyByTile(t);
00606       }
00607     }
00608   }
00609   return flooded;
00610 }
00611 
00612 static const TileIndexDiffC _trackdelta[] = {
00613   { -1,  0 }, {  0,  1 }, { -1,  0 }, {  0,  1 }, {  1,  0 }, {  0,  1 },
00614   {  0,  0 },
00615   {  0,  0 },
00616   {  1,  0 }, {  0, -1 }, {  0, -1 }, {  1,  0 }, {  0, -1 }, { -1,  0 },
00617   {  0,  0 },
00618   {  0,  0 }
00619 };
00620 
00621 
00622 static CommandCost ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)
00623 {
00624   int x = TileX(start);
00625   int y = TileY(start);
00626   int ex = TileX(end);
00627   int ey = TileY(end);
00628   int dx, dy, trdx, trdy;
00629 
00630   if (!ValParamTrackOrientation(TrackdirToTrack(*trackdir))) return CMD_ERROR;
00631 
00632   /* calculate delta x,y from start to end tile */
00633   dx = ex - x;
00634   dy = ey - y;
00635 
00636   /* calculate delta x,y for the first direction */
00637   trdx = _trackdelta[*trackdir].x;
00638   trdy = _trackdelta[*trackdir].y;
00639 
00640   if (!IsDiagonalTrackdir(*trackdir)) {
00641     trdx += _trackdelta[*trackdir ^ 1].x;
00642     trdy += _trackdelta[*trackdir ^ 1].y;
00643   }
00644 
00645   /* validate the direction */
00646   while (
00647     (trdx <= 0 && dx > 0) ||
00648     (trdx >= 0 && dx < 0) ||
00649     (trdy <= 0 && dy > 0) ||
00650     (trdy >= 0 && dy < 0)
00651   ) {
00652     if (!HasBit(*trackdir, 3)) { // first direction is invalid, try the other
00653       SetBit(*trackdir, 3); // reverse the direction
00654       trdx = -trdx;
00655       trdy = -trdy;
00656     } else { // other direction is invalid too, invalid drag
00657       return CMD_ERROR;
00658     }
00659   }
00660 
00661   /* (for diagonal tracks, this is already made sure of by above test), but:
00662    * for non-diagonal tracks, check if the start and end tile are on 1 line */
00663   if (!IsDiagonalTrackdir(*trackdir)) {
00664     trdx = _trackdelta[*trackdir].x;
00665     trdy = _trackdelta[*trackdir].y;
00666     if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx))
00667       return CMD_ERROR;
00668   }
00669 
00670   return CommandCost();
00671 }
00672 
00684 static CommandCost CmdRailTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00685 {
00686   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
00687   Track track = (Track)GB(p2, 4, 3);
00688   bool remove = HasBit(p2, 7);
00689   RailType railtype = (RailType)GB(p2, 0, 4);
00690 
00691   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
00692   if (p1 >= MapSize()) return CMD_ERROR;
00693   TileIndex end_tile = p1;
00694   Trackdir trackdir = TrackToTrackdir(track);
00695 
00696   if (CmdFailed(ValidateAutoDrag(&trackdir, tile, end_tile))) return CMD_ERROR;
00697 
00698   if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, tile);
00699 
00700   for (;;) {
00701     ret = DoCommand(tile, railtype, TrackdirToTrack(trackdir), flags, remove ? CMD_REMOVE_SINGLE_RAIL : CMD_BUILD_SINGLE_RAIL);
00702 
00703     if (CmdFailed(ret)) {
00704       if (_error_message != STR_ERROR_ALREADY_BUILT && !remove) break;
00705       _error_message = INVALID_STRING_ID;
00706     } else {
00707       total_cost.AddCost(ret);
00708     }
00709 
00710     if (tile == end_tile) break;
00711 
00712     tile += ToTileIndexDiff(_trackdelta[trackdir]);
00713 
00714     /* toggle railbit for the non-diagonal tracks */
00715     if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
00716   }
00717 
00718   return (total_cost.GetCost() == 0) ? CommandCost(remove ? INVALID_STRING_ID : (_error_message == INVALID_STRING_ID ? STR_ERROR_ALREADY_BUILT : _error_message)) : total_cost;
00719 }
00720 
00734 CommandCost CmdBuildRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00735 {
00736   return CmdRailTrackHelper(tile, flags, p1, ClrBit(p2, 7), text);
00737 }
00738 
00752 CommandCost CmdRemoveRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00753 {
00754   return CmdRailTrackHelper(tile, flags, p1, SetBit(p2, 7), text);
00755 }
00756 
00768 CommandCost CmdBuildTrainDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00769 {
00770   Slope tileh;
00771 
00772   /* check railtype and valid direction for depot (0 through 3), 4 in total */
00773   if (!ValParamRailtype((RailType)p1)) return CMD_ERROR;
00774 
00775   tileh = GetTileSlope(tile, NULL);
00776 
00777   DiagDirection dir = Extract<DiagDirection, 0>(p2);
00778 
00779   /* Prohibit construction if
00780    * The tile is non-flat AND
00781    * 1) build-on-slopes is disabled
00782    * 2) the tile is steep i.e. spans two height levels
00783    * 3) the exit points in the wrong direction
00784    */
00785 
00786   if (tileh != SLOPE_FLAT && (
00787         !_settings_game.construction.build_on_slopes ||
00788         IsSteepSlope(tileh) ||
00789         !CanBuildDepotByTileh(dir, tileh)
00790       )) {
00791     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00792   }
00793 
00794   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00795   if (CmdFailed(cost)) return CMD_ERROR;
00796 
00797   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
00798 
00799   if (!Depot::CanAllocateItem()) return CMD_ERROR;
00800 
00801   if (flags & DC_EXEC) {
00802     Depot *d = new Depot(tile);
00803     d->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
00804 
00805     MakeRailDepot(tile, _current_company, d->index, dir, (RailType)p1);
00806     MarkTileDirtyByTile(tile);
00807 
00808     AddSideToSignalBuffer(tile, INVALID_DIAGDIR, _current_company);
00809     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
00810   }
00811 
00812   return cost.AddCost(_price[PR_BUILD_DEPOT_TRAIN]);
00813 }
00814 
00835 CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00836 {
00837   Track track = (Track)GB(p1, 0, 3);
00838   bool ctrl_pressed = HasBit(p1, 3); // was the CTRL button pressed
00839   SignalVariant sigvar = (ctrl_pressed ^ HasBit(p1, 4)) ? SIG_SEMAPHORE : SIG_ELECTRIC; // the signal variant of the new signal
00840   SignalType sigtype = (SignalType)GB(p1, 5, 3); // the signal type of the new signal
00841   bool convert_signal = HasBit(p1, 8); // convert button pressed
00842   SignalType cycle_start = (SignalType)GB(p1, 9, 3);
00843   SignalType cycle_stop = (SignalType)GB(p1, 12, 3);
00844   CommandCost cost;
00845   uint num_dir_cycle = GB(p1, 15, 2);
00846 
00847   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
00848 
00849   /* You can only build signals on plain rail tiles, and the selected track must exist */
00850   if (!ValParamTrackOrientation(track) || !IsPlainRailTile(tile) ||
00851       !HasTrack(tile, track) || !EnsureNoTrainOnTrack(tile, track)) {
00852     return CMD_ERROR;
00853   }
00854 
00855   /* Protect against invalid signal copying */
00856   if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
00857 
00858   if (!CheckTileOwnership(tile)) return CMD_ERROR;
00859 
00860   {
00861     /* See if this is a valid track combination for signals, (ie, no overlap) */
00862     TrackBits trackbits = GetTrackBits(tile);
00863     if (KillFirstBit(trackbits) != TRACK_BIT_NONE && // More than one track present
00864         trackbits != TRACK_BIT_HORZ &&
00865         trackbits != TRACK_BIT_VERT) {
00866       return_cmd_error(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK);
00867     }
00868   }
00869 
00870   /* In case we don't want to change an existing signal, return without error. */
00871   if (HasBit(p1, 17) && HasSignalOnTrack(tile, track)) return CommandCost();
00872 
00873   /* you can not convert a signal if no signal is on track */
00874   if (convert_signal && !HasSignalOnTrack(tile, track)) return CMD_ERROR;
00875 
00876   if (!HasSignalOnTrack(tile, track)) {
00877     /* build new signals */
00878     cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS]);
00879   } else {
00880     if (p2 != 0 && sigvar != GetSignalVariant(tile, track)) {
00881       /* convert signals <-> semaphores */
00882       cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
00883 
00884     } else if (convert_signal) {
00885       /* convert button pressed */
00886       if (ctrl_pressed || GetSignalVariant(tile, track) != sigvar) {
00887         /* convert electric <-> semaphore */
00888         cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
00889       } else {
00890         /* it is free to change signal type: normal-pre-exit-combo */
00891         cost = CommandCost();
00892       }
00893 
00894     } else {
00895       /* it is free to change orientation/pre-exit-combo signals */
00896       cost = CommandCost();
00897     }
00898   }
00899 
00900   if (flags & DC_EXEC) {
00901     Train *v = NULL;
00902     /* The new/changed signal could block our path. As this can lead to
00903      * stale reservations, we clear the path reservation here and try
00904      * to redo it later on. */
00905     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
00906       v = GetTrainForReservation(tile, track);
00907       if (v != NULL) FreeTrainTrackReservation(v);
00908     }
00909 
00910     if (!HasSignals(tile)) {
00911       /* there are no signals at all on this tile yet */
00912       SetHasSignals(tile, true);
00913       SetSignalStates(tile, 0xF); // all signals are on
00914       SetPresentSignals(tile, 0); // no signals built by default
00915       SetSignalType(tile, track, sigtype);
00916       SetSignalVariant(tile, track, sigvar);
00917     }
00918 
00919     if (p2 == 0) {
00920       if (!HasSignalOnTrack(tile, track)) {
00921         /* build new signals */
00922         SetPresentSignals(tile, GetPresentSignals(tile) | (IsPbsSignal(sigtype) ? KillFirstBit(SignalOnTrack(track)) : SignalOnTrack(track)));
00923         SetSignalType(tile, track, sigtype);
00924         SetSignalVariant(tile, track, sigvar);
00925         while (num_dir_cycle-- > 0) CycleSignalSide(tile, track);
00926       } else {
00927         if (convert_signal) {
00928           /* convert signal button pressed */
00929           if (ctrl_pressed) {
00930             /* toggle the pressent signal variant: SIG_ELECTRIC <-> SIG_SEMAPHORE */
00931             SetSignalVariant(tile, track, (GetSignalVariant(tile, track) == SIG_ELECTRIC) ? SIG_SEMAPHORE : SIG_ELECTRIC);
00932             /* Query current signal type so the check for PBS signals below works. */
00933             sigtype = GetSignalType(tile, track);
00934           } else {
00935             /* convert the present signal to the chosen type and variant */
00936             SetSignalType(tile, track, sigtype);
00937             SetSignalVariant(tile, track, sigvar);
00938             if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
00939               SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
00940             }
00941           }
00942 
00943         } else if (ctrl_pressed) {
00944           /* cycle between cycle_start and cycle_end */
00945           sigtype = (SignalType)(GetSignalType(tile, track) + 1);
00946 
00947           if (sigtype < cycle_start || sigtype > cycle_stop) sigtype = cycle_start;
00948 
00949           SetSignalType(tile, track, sigtype);
00950           if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
00951             SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
00952           }
00953         } else {
00954           /* cycle the signal side: both -> left -> right -> both -> ... */
00955           CycleSignalSide(tile, track);
00956           /* Query current signal type so the check for PBS signals below works. */
00957           sigtype = GetSignalType(tile, track);
00958         }
00959       }
00960     } else {
00961       /* If CmdBuildManySignals is called with copying signals, just copy the
00962        * direction of the first signal given as parameter by CmdBuildManySignals */
00963       SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | (p2 & SignalOnTrack(track)));
00964       SetSignalVariant(tile, track, sigvar);
00965       SetSignalType(tile, track, sigtype);
00966     }
00967 
00968     if (IsPbsSignal(sigtype)) {
00969       /* PBS signals should show red unless they are on a reservation. */
00970       uint mask = GetPresentSignals(tile) & SignalOnTrack(track);
00971       SetSignalStates(tile, (GetSignalStates(tile) & ~mask) | ((HasBit(GetRailReservationTrackBits(tile), track) ? UINT_MAX : 0) & mask));
00972     }
00973     MarkTileDirtyByTile(tile);
00974     AddTrackToSignalBuffer(tile, track, _current_company);
00975     YapfNotifyTrackLayoutChange(tile, track);
00976     if (v != NULL) TryPathReserve(v, true);
00977   }
00978 
00979   return cost;
00980 }
00981 
00982 static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
00983 {
00984   tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
00985   if (tile == INVALID_TILE) return false;
00986 
00987   /* Check for track bits on the new tile */
00988   TrackdirBits trackdirbits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
00989 
00990   if (TracksOverlap(TrackdirBitsToTrackBits(trackdirbits))) return false;
00991   trackdirbits &= TrackdirReachesTrackdirs(trackdir);
00992 
00993   /* No track bits, must stop */
00994   if (trackdirbits == TRACKDIR_BIT_NONE) return false;
00995 
00996   /* Get the first track dir */
00997   trackdir = RemoveFirstTrackdir(&trackdirbits);
00998 
00999   /* Any left? It's a junction so we stop */
01000   if (trackdirbits != TRACKDIR_BIT_NONE) return false;
01001 
01002   switch (GetTileType(tile)) {
01003     case MP_RAILWAY:
01004       if (IsRailDepot(tile)) return false;
01005       if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
01006       signal_ctr++;
01007       if (IsDiagonalTrackdir(trackdir)) {
01008         signal_ctr++;
01009         /* Ensure signal_ctr even so X and Y pieces get signals */
01010         ClrBit(signal_ctr, 0);
01011       }
01012       return true;
01013 
01014     case MP_ROAD:
01015       if (!IsLevelCrossing(tile)) return false;
01016       signal_ctr += 2;
01017       return true;
01018 
01019     case MP_TUNNELBRIDGE: {
01020       TileIndex orig_tile = tile; // backup old value
01021 
01022       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
01023       if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
01024 
01025       /* Skip to end of tunnel or bridge
01026        * note that tile is a parameter by reference, so it must be updated */
01027       tile = GetOtherTunnelBridgeEnd(tile);
01028 
01029       signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
01030       return true;
01031     }
01032 
01033     default: return false;
01034   }
01035 }
01036 
01052 static CommandCost CmdSignalTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01053 {
01054   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
01055   int signal_ctr;
01056   byte signals;
01057   bool err = true;
01058   TileIndex end_tile;
01059   TileIndex start_tile = tile;
01060 
01061   Track track = (Track)GB(p2, 0, 3);
01062   bool mode = HasBit(p2, 3);
01063   bool semaphores = HasBit(p2, 4);
01064   bool remove = HasBit(p2, 5);
01065   bool autofill = HasBit(p2, 6);
01066   Trackdir trackdir = TrackToTrackdir(track);
01067   byte signal_density = GB(p2, 24, 8);
01068 
01069   if (p1 >= MapSize()) return CMD_ERROR;
01070   end_tile = p1;
01071   if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
01072 
01073   if (!IsPlainRailTile(tile)) return CMD_ERROR;
01074 
01075   /* for vertical/horizontal tracks, double the given signals density
01076    * since the original amount will be too dense (shorter tracks) */
01077   signal_density *= 2;
01078 
01079   if (CmdFailed(ValidateAutoDrag(&trackdir, tile, end_tile))) return CMD_ERROR;
01080 
01081   track = TrackdirToTrack(trackdir); // trackdir might have changed, keep track in sync
01082   Trackdir start_trackdir = trackdir;
01083 
01084   /* Must start on a valid track to be able to avoid loops */
01085   if (!HasTrack(tile, track)) return CMD_ERROR;
01086 
01087   SignalType sigtype = (SignalType)GB(p2, 7, 3);
01088   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
01089 
01090   /* copy the signal-style of the first rail-piece if existing */
01091   if (HasSignalOnTrack(tile, track)) {
01092     signals = GetPresentSignals(tile) & SignalOnTrack(track);
01093     assert(signals != 0);
01094 
01095     /* copy signal/semaphores style (independent of CTRL) */
01096     semaphores = GetSignalVariant(tile, track) != SIG_ELECTRIC;
01097 
01098     sigtype = GetSignalType(tile, track);
01099     /* Don't but copy pre-signal type */
01100     if (sigtype < SIGTYPE_PBS) sigtype = SIGTYPE_NORMAL;
01101   } else { // no signals exist, drag a two-way signal stretch
01102     signals = IsPbsSignal(sigtype) ? SignalAlongTrackdir(trackdir) : SignalOnTrack(track);
01103   }
01104 
01105   byte signal_dir = 0;
01106   if (signals & SignalAlongTrackdir(trackdir))   SetBit(signal_dir, 0);
01107   if (signals & SignalAgainstTrackdir(trackdir)) SetBit(signal_dir, 1);
01108 
01109   /* signal_ctr         - amount of tiles already processed
01110    * signals_density    - setting to put signal on every Nth tile (double space on |, -- tracks)
01111    **********
01112    * trackdir   - trackdir to build with autorail
01113    * semaphores - semaphores or signals
01114    * signals    - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
01115    *              and convert all others to semaphore/signal
01116    * remove     - 1 remove signals, 0 build signals */
01117   signal_ctr = 0;
01118   for (;;) {
01119     /* only build/remove signals with the specified density */
01120     if ((remove && autofill) || signal_ctr % signal_density == 0) {
01121       uint32 p1 = GB(TrackdirToTrack(trackdir), 0, 3);
01122       SB(p1, 3, 1, mode);
01123       SB(p1, 4, 1, semaphores);
01124       SB(p1, 5, 3, sigtype);
01125       if (!remove && signal_ctr == 0) SetBit(p1, 17);
01126 
01127       /* Pick the correct orientation for the track direction */
01128       signals = 0;
01129       if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
01130       if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
01131 
01132       ret = DoCommand(tile, p1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
01133 
01134       /* Be user-friendly and try placing signals as much as possible */
01135       if (CmdSucceeded(ret)) {
01136         err = false;
01137         total_cost.AddCost(ret);
01138       }
01139     }
01140 
01141     if (autofill) {
01142       if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
01143 
01144       /* Prevent possible loops */
01145       if (tile == start_tile && trackdir == start_trackdir) break;
01146     } else {
01147       if (tile == end_tile) break;
01148 
01149       tile += ToTileIndexDiff(_trackdelta[trackdir]);
01150       signal_ctr++;
01151 
01152       /* toggle railbit for the non-diagonal tracks (|, -- tracks) */
01153       if (IsDiagonalTrackdir(trackdir)) {
01154         signal_ctr++;
01155       } else {
01156         ToggleBit(trackdir, 0);
01157       }
01158     }
01159   }
01160 
01161   return err ? CMD_ERROR : total_cost;
01162 }
01163 
01181 CommandCost CmdBuildSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01182 {
01183   return CmdSignalTrackHelper(tile, flags, p1, p2, text);
01184 }
01185 
01197 CommandCost CmdRemoveSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01198 {
01199   Track track = (Track)GB(p1, 0, 3);
01200 
01201   if (!ValParamTrackOrientation(track) ||
01202       !IsPlainRailTile(tile) ||
01203       !HasTrack(tile, track) ||
01204       !EnsureNoTrainOnTrack(tile, track) ||
01205       !HasSignalOnTrack(tile, track)) {
01206     return CMD_ERROR;
01207   }
01208 
01209   /* Only water can remove signals from anyone */
01210   if (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) return CMD_ERROR;
01211 
01212   /* Do it? */
01213   if (flags & DC_EXEC) {
01214     Train *v = NULL;
01215     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
01216       v = GetTrainForReservation(tile, track);
01217     }
01218     SetPresentSignals(tile, GetPresentSignals(tile) & ~SignalOnTrack(track));
01219 
01220     /* removed last signal from tile? */
01221     if (GetPresentSignals(tile) == 0) {
01222       SetSignalStates(tile, 0);
01223       SetHasSignals(tile, false);
01224       SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
01225     }
01226 
01227     AddTrackToSignalBuffer(tile, track, GetTileOwner(tile));
01228     YapfNotifyTrackLayoutChange(tile, track);
01229     if (v != NULL) TryPathReserve(v, false);
01230 
01231     MarkTileDirtyByTile(tile);
01232   }
01233 
01234   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_SIGNALS]);
01235 }
01236 
01254 CommandCost CmdRemoveSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01255 {
01256   return CmdSignalTrackHelper(tile, flags, p1, SetBit(p2, 5), text); // bit 5 is remove bit
01257 }
01258 
01260 static Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
01261 {
01262   if (v->type != VEH_TRAIN) return NULL;
01263 
01264   /* Similiar checks as in TrainPowerChanged() */
01265 
01266   Train *t = Train::From(v);
01267   if (t->IsArticulatedPart()) return NULL;
01268 
01269   const RailVehicleInfo *rvi = RailVehInfo(t->engine_type);
01270   if (GetVehicleProperty(t, PROP_TRAIN_POWER, rvi->power) != 0) TrainPowerChanged(t->First());
01271 
01272   return NULL;
01273 }
01274 
01284 CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01285 {
01286   CommandCost cost(EXPENSES_CONSTRUCTION);
01287   RailType totype = (RailType)p2;
01288 
01289   if (!ValParamRailtype(totype)) return CMD_ERROR;
01290   if (p1 >= MapSize()) return CMD_ERROR;
01291 
01292   uint ex = TileX(tile);
01293   uint ey = TileY(tile);
01294   uint sx = TileX(p1);
01295   uint sy = TileY(p1);
01296 
01297   /* make sure sx,sy are smaller than ex,ey */
01298   if (ex < sx) Swap(ex, sx);
01299   if (ey < sy) Swap(ey, sy);
01300 
01301   _error_message = STR_ERROR_NO_SUITABLE_RAILROAD_TRACK; // by default, there is no track to convert
01302 
01303   for (uint x = sx; x <= ex; ++x) {
01304     for (uint y = sy; y <= ey; ++y) {
01305       TileIndex tile = TileXY(x, y);
01306       TileType tt = GetTileType(tile);
01307 
01308       /* Check if there is any track on tile */
01309       switch (tt) {
01310         case MP_RAILWAY:
01311           break;
01312         case MP_STATION:
01313           if (!HasStationRail(tile)) continue;
01314           break;
01315         case MP_ROAD:
01316           if (!IsLevelCrossing(tile)) continue;
01317           break;
01318         case MP_TUNNELBRIDGE:
01319           if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
01320           break;
01321         default: continue;
01322       }
01323 
01324       /* Original railtype we are converting from */
01325       RailType type = GetRailType(tile);
01326 
01327       /* Converting to the same type or converting 'hidden' elrail -> rail */
01328       if (type == totype || (_settings_game.vehicle.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
01329 
01330       /* Trying to convert other's rail */
01331       if (!CheckTileOwnership(tile)) continue;
01332 
01333       SmallVector<Train *, 2> vehicles_affected;
01334 
01335       /* Vehicle on the tile when not converting Rail <-> ElRail
01336        * Tunnels and bridges have special check later */
01337       if (tt != MP_TUNNELBRIDGE) {
01338         if (!IsCompatibleRail(type, totype) && !EnsureNoVehicleOnGround(tile)) continue;
01339         if (flags & DC_EXEC) { // we can safely convert, too
01340           TrackBits reserved = GetReservedTrackbits(tile);
01341           Track     track;
01342           while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
01343             Train *v = GetTrainForReservation(tile, track);
01344             if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
01345               /* No power on new rail type, reroute. */
01346               FreeTrainTrackReservation(v);
01347               *vehicles_affected.Append() = v;
01348             }
01349           }
01350 
01351           SetRailType(tile, totype);
01352           MarkTileDirtyByTile(tile);
01353           /* update power of train engines on this tile */
01354           FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
01355         }
01356       }
01357 
01358       switch (tt) {
01359         case MP_RAILWAY:
01360           switch (GetRailTileType(tile)) {
01361             case RAIL_TILE_DEPOT:
01362               if (flags & DC_EXEC) {
01363                 /* notify YAPF about the track layout change */
01364                 YapfNotifyTrackLayoutChange(tile, GetRailDepotTrack(tile));
01365 
01366                 /* Update build vehicle window related to this depot */
01367                 InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
01368                 InvalidateWindowData(WC_BUILD_VEHICLE, tile);
01369               }
01370               cost.AddCost(RailConvertCost(type, totype));
01371               break;
01372 
01373             default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
01374               if (flags & DC_EXEC) {
01375                 /* notify YAPF about the track layout change */
01376                 TrackBits tracks = GetTrackBits(tile);
01377                 while (tracks != TRACK_BIT_NONE) {
01378                   YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
01379                 }
01380               }
01381               cost.AddCost(RailConvertCost(type, totype) * CountBits(GetTrackBits(tile)));
01382               break;
01383           }
01384           break;
01385 
01386         case MP_TUNNELBRIDGE: {
01387           TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
01388 
01389           /* If both ends of tunnel/bridge are in the range, do not try to convert twice -
01390            * it would cause assert because of different test and exec runs */
01391           if (endtile < tile && TileX(endtile) >= sx && TileX(endtile) <= ex &&
01392               TileY(endtile) >= sy && TileY(endtile) <= ey) continue;
01393 
01394           /* When not coverting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
01395           if (!IsCompatibleRail(GetRailType(tile), totype) &&
01396               HasVehicleOnTunnelBridge(tile, endtile)) continue;
01397 
01398           if (flags & DC_EXEC) {
01399             Track track = DiagDirToDiagTrack(GetTunnelBridgeDirection(tile));
01400             if (HasTunnelBridgeReservation(tile)) {
01401               Train *v = GetTrainForReservation(tile, track);
01402               if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
01403                 /* No power on new rail type, reroute. */
01404                 FreeTrainTrackReservation(v);
01405                 *vehicles_affected.Append() = v;
01406               }
01407             }
01408             SetRailType(tile, totype);
01409             SetRailType(endtile, totype);
01410 
01411             FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
01412             FindVehicleOnPos(endtile, NULL, &UpdateTrainPowerProc);
01413 
01414             YapfNotifyTrackLayoutChange(tile, track);
01415             YapfNotifyTrackLayoutChange(endtile, track);
01416 
01417             MarkTileDirtyByTile(tile);
01418             MarkTileDirtyByTile(endtile);
01419 
01420             if (IsBridge(tile)) {
01421               TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
01422               TileIndex t = tile + delta;
01423               for (; t != endtile; t += delta) MarkTileDirtyByTile(t); // TODO encapsulate this into a function
01424             }
01425           }
01426 
01427           cost.AddCost((GetTunnelBridgeLength(tile, endtile) + 2) * RailConvertCost(type, totype));
01428         } break;
01429 
01430         default: // MP_STATION, MP_ROAD
01431           if (flags & DC_EXEC) {
01432             Track track = ((tt == MP_STATION) ? GetRailStationTrack(tile) : GetCrossingRailTrack(tile));
01433             YapfNotifyTrackLayoutChange(tile, track);
01434           }
01435 
01436           cost.AddCost(RailConvertCost(type, totype));
01437           break;
01438       }
01439 
01440       for (uint i = 0; i < vehicles_affected.Length(); ++i) {
01441         TryPathReserve(vehicles_affected[i], true);
01442       }
01443     }
01444   }
01445 
01446   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
01447 }
01448 
01449 static CommandCost RemoveTrainDepot(TileIndex tile, DoCommandFlag flags)
01450 {
01451   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER)
01452     return CMD_ERROR;
01453 
01454   if (!EnsureNoVehicleOnGround(tile))
01455     return CMD_ERROR;
01456 
01457   if (flags & DC_EXEC) {
01458     /* read variables before the depot is removed */
01459     DiagDirection dir = GetRailDepotDirection(tile);
01460     Owner owner = GetTileOwner(tile);
01461     Train *v = NULL;
01462 
01463     if (HasDepotReservation(tile)) {
01464       v = GetTrainForReservation(tile, DiagDirToDiagTrack(dir));
01465       if (v != NULL) FreeTrainTrackReservation(v);
01466     }
01467 
01468     delete Depot::GetByTile(tile);
01469     DoClearSquare(tile);
01470     AddSideToSignalBuffer(tile, dir, owner);
01471     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
01472     if (v != NULL) TryPathReserve(v, true);
01473   }
01474 
01475   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_TRAIN]);
01476 }
01477 
01478 static CommandCost ClearTile_Track(TileIndex tile, DoCommandFlag flags)
01479 {
01480   CommandCost cost(EXPENSES_CONSTRUCTION);
01481   CommandCost ret;
01482 
01483   if (flags & DC_AUTO) {
01484     if (!IsTileOwner(tile, _current_company)) {
01485       return_cmd_error(STR_ERROR_AREA_IS_OWNED_BY_ANOTHER);
01486     }
01487 
01488     if (IsPlainRail(tile)) {
01489       return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
01490     } else {
01491       return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
01492     }
01493   }
01494 
01495   switch (GetRailTileType(tile)) {
01496     case RAIL_TILE_SIGNALS:
01497     case RAIL_TILE_NORMAL: {
01498       Slope tileh = GetTileSlope(tile, NULL);
01499       /* Is there flat water on the lower halftile, that gets cleared expensively? */
01500       bool water_ground = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh));
01501 
01502       TrackBits tracks = GetTrackBits(tile);
01503       while (tracks != TRACK_BIT_NONE) {
01504         Track track = RemoveFirstTrack(&tracks);
01505         ret = DoCommand(tile, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
01506         if (CmdFailed(ret)) return CMD_ERROR;
01507         cost.AddCost(ret);
01508       }
01509 
01510       /* when bankrupting, don't make water dirty, there could be a ship on lower halftile */
01511       if (water_ground && !(flags & DC_BANKRUPT)) {
01512         if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
01513 
01514         /* The track was removed, and left a coast tile. Now also clear the water. */
01515         if (flags & DC_EXEC) DoClearSquare(tile);
01516         cost.AddCost(_price[PR_CLEAR_WATER]);
01517       }
01518 
01519       return cost;
01520     }
01521 
01522     case RAIL_TILE_DEPOT:
01523       return RemoveTrainDepot(tile, flags);
01524 
01525     default:
01526       return CMD_ERROR;
01527   }
01528 }
01529 
01534 static uint GetSaveSlopeZ(uint x, uint y, Track track)
01535 {
01536   switch (track) {
01537     case TRACK_UPPER: x &= ~0xF; y &= ~0xF; break;
01538     case TRACK_LOWER: x |=  0xF; y |=  0xF; break;
01539     case TRACK_LEFT:  x |=  0xF; y &= ~0xF; break;
01540     case TRACK_RIGHT: x &= ~0xF; y |=  0xF; break;
01541     default: break;
01542   }
01543   return GetSlopeZ(x, y);
01544 }
01545 
01546 static void DrawSingleSignal(TileIndex tile, Track track, byte condition, uint image, uint pos)
01547 {
01548   bool side = (_settings_game.vehicle.road_side != 0) && _settings_game.construction.signal_side;
01549   static const Point SignalPositions[2][12] = {
01550     { // Signals on the left side
01551     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
01552       { 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
01553     /*  LOWER     LOWER     X         X         Y         Y     */
01554       {11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
01555     }, { // Signals on the right side
01556     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
01557       {14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
01558     /*  LOWER     LOWER     X         X         Y         Y     */
01559       {14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
01560     }
01561   };
01562 
01563   uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
01564   uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
01565 
01566   SpriteID sprite;
01567 
01568   SignalType type       = GetSignalType(tile, track);
01569   SignalVariant variant = GetSignalVariant(tile, track);
01570 
01571   if (type == SIGTYPE_NORMAL && variant == SIG_ELECTRIC) {
01572     /* Normal electric signals are picked from original sprites. */
01573     sprite = SPR_ORIGINAL_SIGNALS_BASE + image + condition;
01574   } else {
01575     /* All other signals are picked from add on sprites. */
01576     sprite = SPR_SIGNALS_BASE + (type - 1) * 16 + variant * 64 + image + condition + (type > SIGTYPE_LAST_NOPBS ? 64 : 0);
01577   }
01578 
01579   AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, GetSaveSlopeZ(x, y, track));
01580 }
01581 
01582 static uint32 _drawtile_track_palette;
01583 
01584 
01585 static void DrawTrackFence_NW(const TileInfo *ti, SpriteID base_image)
01586 {
01587   RailFenceOffset rfo = RFO_FLAT_X;
01588   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
01589   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01590     ti->x, ti->y + 1, 16, 1, 4, ti->z);
01591 }
01592 
01593 static void DrawTrackFence_SE(const TileInfo *ti, SpriteID base_image)
01594 {
01595   RailFenceOffset rfo = RFO_FLAT_X;
01596   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
01597   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01598     ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
01599 }
01600 
01601 static void DrawTrackFence_NW_SE(const TileInfo *ti, SpriteID base_image)
01602 {
01603   DrawTrackFence_NW(ti, base_image);
01604   DrawTrackFence_SE(ti, base_image);
01605 }
01606 
01607 static void DrawTrackFence_NE(const TileInfo *ti, SpriteID base_image)
01608 {
01609   RailFenceOffset rfo = RFO_FLAT_Y;
01610   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
01611   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01612     ti->x + 1, ti->y, 1, 16, 4, ti->z);
01613 }
01614 
01615 static void DrawTrackFence_SW(const TileInfo *ti, SpriteID base_image)
01616 {
01617   RailFenceOffset rfo = RFO_FLAT_Y;
01618   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
01619   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01620     ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
01621 }
01622 
01623 static void DrawTrackFence_NE_SW(const TileInfo *ti, SpriteID base_image)
01624 {
01625   DrawTrackFence_NE(ti, base_image);
01626   DrawTrackFence_SW(ti, base_image);
01627 }
01628 
01632 static void DrawTrackFence_NS_1(const TileInfo *ti, SpriteID base_image)
01633 {
01634   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_W);
01635   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
01636     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01637 }
01638 
01642 static void DrawTrackFence_NS_2(const TileInfo *ti, SpriteID base_image)
01643 {
01644   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_E);
01645   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
01646     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01647 }
01648 
01652 static void DrawTrackFence_WE_1(const TileInfo *ti, SpriteID base_image)
01653 {
01654   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_N);
01655   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
01656     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01657 }
01658 
01662 static void DrawTrackFence_WE_2(const TileInfo *ti, SpriteID base_image)
01663 {
01664   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_S);
01665   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
01666     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01667 }
01668 
01669 
01670 static void DrawTrackDetails(const TileInfo *ti)
01671 {
01672   /* Base sprite for track fences. */
01673   SpriteID base_image = SPR_TRACK_FENCE_FLAT_X;
01674 
01675   switch (GetRailGroundType(ti->tile)) {
01676     case RAIL_GROUND_FENCE_NW:     DrawTrackFence_NW(ti, base_image);    break;
01677     case RAIL_GROUND_FENCE_SE:     DrawTrackFence_SE(ti, base_image);    break;
01678     case RAIL_GROUND_FENCE_SENW:   DrawTrackFence_NW_SE(ti, base_image); break;
01679     case RAIL_GROUND_FENCE_NE:     DrawTrackFence_NE(ti, base_image);    break;
01680     case RAIL_GROUND_FENCE_SW:     DrawTrackFence_SW(ti, base_image);    break;
01681     case RAIL_GROUND_FENCE_NESW:   DrawTrackFence_NE_SW(ti, base_image); break;
01682     case RAIL_GROUND_FENCE_VERT1:  DrawTrackFence_NS_1(ti, base_image);  break;
01683     case RAIL_GROUND_FENCE_VERT2:  DrawTrackFence_NS_2(ti, base_image);  break;
01684     case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti, base_image);  break;
01685     case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti, base_image);  break;
01686     case RAIL_GROUND_WATER: {
01687       Corner track_corner;
01688       if (IsHalftileSlope(ti->tileh)) {
01689         /* Steep slope or one-corner-raised slope with halftile foundation */
01690         track_corner = GetHalftileSlopeCorner(ti->tileh);
01691       } else {
01692         /* Three-corner-raised slope */
01693         track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
01694       }
01695       switch (track_corner) {
01696         case CORNER_W: DrawTrackFence_NS_1(ti, base_image); break;
01697         case CORNER_S: DrawTrackFence_WE_2(ti, base_image); break;
01698         case CORNER_E: DrawTrackFence_NS_2(ti, base_image); break;
01699         case CORNER_N: DrawTrackFence_WE_1(ti, base_image); break;
01700         default: NOT_REACHED();
01701       }
01702       break;
01703     }
01704     default: break;
01705   }
01706 }
01707 
01708 
01714 static void DrawTrackBits(TileInfo *ti, TrackBits track)
01715 {
01716   /* SubSprite for drawing the track halftile of 'three-corners-raised'-sloped rail sprites. */
01717   static const int INF = 1000; // big number compared to tilesprite size
01718   static const SubSprite _halftile_sub_sprite[4] = {
01719     { -INF    , -INF  , 32 - 33, INF     }, // CORNER_W, clip 33 pixels from right
01720     { -INF    ,  0 + 7, INF    , INF     }, // CORNER_S, clip 7 pixels from top
01721     { -31 + 33, -INF  , INF    , INF     }, // CORNER_E, clip 33 pixels from left
01722     { -INF    , -INF  , INF    , 30 - 23 }  // CORNER_N, clip 23 pixels from bottom
01723   };
01724 
01725   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
01726   RailGroundType rgt = GetRailGroundType(ti->tile);
01727   Foundation f = GetRailFoundation(ti->tileh, track);
01728   Corner halftile_corner = CORNER_INVALID;
01729 
01730   if (IsNonContinuousFoundation(f)) {
01731     /* Save halftile corner */
01732     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
01733     /* Draw lower part first */
01734     track &= ~CornerToTrackBits(halftile_corner);
01735     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
01736   }
01737 
01738   DrawFoundation(ti, f);
01739   /* DrawFoundation modifies ti */
01740 
01741   SpriteID image;
01742   SpriteID pal = PAL_NONE;
01743   const SubSprite *sub = NULL;
01744   bool junction = false;
01745 
01746   /* Select the sprite to use. */
01747   if (track == 0) {
01748     /* Clear ground (only track on halftile foundation) */
01749     if (rgt == RAIL_GROUND_WATER) {
01750       if (IsSteepSlope(ti->tileh)) {
01751         DrawShoreTile(ti->tileh);
01752         image = 0;
01753       } else {
01754         image = SPR_FLAT_WATER_TILE;
01755       }
01756     } else {
01757       switch (rgt) {
01758         case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
01759         case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
01760         default:                     image = SPR_FLAT_GRASS_TILE; break;
01761       }
01762       image += _tileh_to_sprite[ti->tileh];
01763     }
01764   } else {
01765     if (ti->tileh != SLOPE_FLAT) {
01766       /* track on non-flat ground */
01767       image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
01768     } else {
01769       /* track on flat ground */
01770       (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
01771       (image++,                           track == TRACK_BIT_X) ||
01772       (image++,                           track == TRACK_BIT_UPPER) ||
01773       (image++,                           track == TRACK_BIT_LOWER) ||
01774       (image++,                           track == TRACK_BIT_RIGHT) ||
01775       (image++,                           track == TRACK_BIT_LEFT) ||
01776       (image++,                           track == TRACK_BIT_CROSS) ||
01777 
01778       (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
01779       (image++,                            track == TRACK_BIT_VERT) ||
01780 
01781       (junction = true, false) ||
01782       (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
01783       (image++,                          (track & TRACK_BIT_3WAY_SW) == 0) ||
01784       (image++,                          (track & TRACK_BIT_3WAY_NW) == 0) ||
01785       (image++,                          (track & TRACK_BIT_3WAY_SE) == 0) ||
01786       (image++, true);
01787     }
01788 
01789     switch (rgt) {
01790       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
01791       case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset;  break;
01792       case RAIL_GROUND_WATER: {
01793         /* three-corner-raised slope */
01794         DrawShoreTile(ti->tileh);
01795         Corner track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
01796         sub = &(_halftile_sub_sprite[track_corner]);
01797         break;
01798       }
01799       default: break;
01800     }
01801   }
01802 
01803   if (image != 0) DrawGroundSprite(image, pal, sub);
01804 
01805   /* Draw track pieces individually for junction tiles */
01806   if (junction) {
01807     if (track & TRACK_BIT_X)     DrawGroundSprite(rti->base_sprites.single_x, PAL_NONE);
01808     if (track & TRACK_BIT_Y)     DrawGroundSprite(rti->base_sprites.single_y, PAL_NONE);
01809     if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PAL_NONE);
01810     if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PAL_NONE);
01811     if (track & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PAL_NONE);
01812     if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PAL_NONE);
01813   }
01814 
01815   /* PBS debugging, draw reserved tracks darker */
01816   if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation) {
01817     /* Get reservation, but mask track on halftile slope */
01818     TrackBits pbs = GetRailReservationTrackBits(ti->tile) & track;
01819     if (pbs & TRACK_BIT_X) {
01820       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
01821         DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH);
01822       } else {
01823         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
01824       }
01825     }
01826     if (pbs & TRACK_BIT_Y) {
01827       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
01828         DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH);
01829       } else {
01830         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
01831       }
01832     }
01833     if (pbs & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_N ? -TILE_HEIGHT : 0);
01834     if (pbs & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_S ? -TILE_HEIGHT : 0);
01835     if (pbs & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_W ? -TILE_HEIGHT : 0);
01836     if (pbs & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_E ? -TILE_HEIGHT : 0);
01837   }
01838 
01839   if (IsValidCorner(halftile_corner)) {
01840     DrawFoundation(ti, HalftileFoundation(halftile_corner));
01841 
01842     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
01843     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
01844     image = _track_sloped_sprites[fake_slope - 1] + rti->base_sprites.track_y;
01845     pal = PAL_NONE;
01846     switch (rgt) {
01847       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
01848       case RAIL_GROUND_ICE_DESERT:
01849       case RAIL_GROUND_HALF_SNOW:  image += rti->snow_offset;  break; // higher part has snow in this case too
01850       default: break;
01851     }
01852     DrawGroundSprite(image, pal, &(_halftile_sub_sprite[halftile_corner]));
01853 
01854     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, CornerToTrackBits(halftile_corner))) {
01855       static const byte _corner_to_track_sprite[] = {3, 1, 2, 0};
01856       DrawGroundSprite(_corner_to_track_sprite[halftile_corner] + rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, -TILE_HEIGHT);
01857     }
01858   }
01859 }
01860 
01866 enum {
01867   SIGNAL_TO_SOUTHWEST =  0,
01868   SIGNAL_TO_NORTHEAST =  2,
01869   SIGNAL_TO_SOUTHEAST =  4,
01870   SIGNAL_TO_NORTHWEST =  6,
01871   SIGNAL_TO_EAST      =  8,
01872   SIGNAL_TO_WEST      = 10,
01873   SIGNAL_TO_SOUTH     = 12,
01874   SIGNAL_TO_NORTH     = 14,
01875 };
01876 
01877 static void DrawSignals(TileIndex tile, TrackBits rails)
01878 {
01879 #define MAYBE_DRAW_SIGNAL(x, y, z, t) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, t, GetSingleSignalState(tile, x), y, z)
01880 
01881   if (!(rails & TRACK_BIT_Y)) {
01882     if (!(rails & TRACK_BIT_X)) {
01883       if (rails & TRACK_BIT_LEFT) {
01884         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTH, 0, TRACK_LEFT);
01885         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTH, 1, TRACK_LEFT);
01886       }
01887       if (rails & TRACK_BIT_RIGHT) {
01888         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_NORTH, 2, TRACK_RIGHT);
01889         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_SOUTH, 3, TRACK_RIGHT);
01890       }
01891       if (rails & TRACK_BIT_UPPER) {
01892         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_WEST, 4, TRACK_UPPER);
01893         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_EAST, 5, TRACK_UPPER);
01894       }
01895       if (rails & TRACK_BIT_LOWER) {
01896         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_WEST, 6, TRACK_LOWER);
01897         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_EAST, 7, TRACK_LOWER);
01898       }
01899     } else {
01900       MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHWEST, 8, TRACK_X);
01901       MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHEAST, 9, TRACK_X);
01902     }
01903   } else {
01904     MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHEAST, 10, TRACK_Y);
01905     MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHWEST, 11, TRACK_Y);
01906   }
01907 }
01908 
01909 static void DrawTile_Track(TileInfo *ti)
01910 {
01911   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
01912   SpriteID image;
01913 
01914   _drawtile_track_palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
01915 
01916   if (IsPlainRail(ti->tile)) {
01917     TrackBits rails = GetTrackBits(ti->tile);
01918 
01919     DrawTrackBits(ti, rails);
01920 
01921     if (HasBit(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti);
01922 
01923     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01924 
01925     if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
01926   } else {
01927     /* draw depot */
01928     const DrawTileSprites *dts;
01929     const DrawTileSeqStruct *dtss;
01930     uint32 relocation;
01931     SpriteID pal = PAL_NONE;
01932 
01933     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01934 
01935     if (IsInvisibilitySet(TO_BUILDINGS)) {
01936       /* Draw rail instead of depot */
01937       dts = &_depot_invisible_gfx_table[GetRailDepotDirection(ti->tile)];
01938     } else {
01939       dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
01940     }
01941 
01942     relocation = rti->total_offset;
01943 
01944     image = dts->ground.sprite;
01945     if (image != SPR_FLAT_GRASS_TILE) image += rti->total_offset;
01946 
01947     /* adjust ground tile for desert
01948      * don't adjust for snow, because snow in depots looks weird */
01949     if (IsSnowRailGround(ti->tile) && _settings_game.game_creation.landscape == LT_TROPIC) {
01950       if (image != SPR_FLAT_GRASS_TILE) {
01951         image += rti->snow_offset; // tile with tracks
01952       } else {
01953         image = SPR_FLAT_SNOW_DESERT_TILE; // flat ground
01954       }
01955     }
01956 
01957     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, _drawtile_track_palette));
01958 
01959     /* PBS debugging, draw reserved tracks darker */
01960     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
01961       switch (GetRailDepotDirection(ti->tile)) {
01962         case DIAGDIR_SW: DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH); break;
01963         case DIAGDIR_SE: DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH); break;
01964         default: break;
01965       }
01966     }
01967 
01968     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01969 
01970     foreach_draw_tile_seq(dtss, dts->seq) {
01971       SpriteID image = dtss->image.sprite;
01972       SpriteID pal   = dtss->image.pal;
01973 
01974       /* Stop drawing sprite sequence once we meet a sprite that doesn't have to be opaque */
01975       if (IsInvisibilitySet(TO_BUILDINGS) && !HasBit(image, SPRITE_MODIFIER_OPAQUE)) return;
01976 
01977       /* Unlike stations, our default waypoint has no variation for
01978        * different railtype, so don't use the railtype offset if
01979        * no relocation is set */
01980       if (HasBit(image, SPRITE_MODIFIER_USE_OFFSET)) {
01981         image += rti->total_offset;
01982       } else {
01983         image += relocation;
01984       }
01985 
01986       pal = SpriteLayoutPaletteTransform(image, pal, _drawtile_track_palette);
01987 
01988       if ((byte)dtss->delta_z != 0x80) {
01989         AddSortableSpriteToDraw(
01990           image, pal,
01991           ti->x + dtss->delta_x, ti->y + dtss->delta_y,
01992           dtss->size_x, dtss->size_y,
01993           dtss->size_z, ti->z + dtss->delta_z,
01994           !HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(TO_BUILDINGS)
01995         );
01996       } else {
01997         /* For stations and original spritelayouts delta_x and delta_y are signed */
01998         AddChildSpriteScreen(image, pal, dtss->delta_x, dtss->delta_y, !HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(TO_BUILDINGS));
01999       }
02000     }
02001   }
02002   DrawBridgeMiddle(ti);
02003 }
02004 
02005 
02006 static void DrawTileSequence(int x, int y, SpriteID ground, const DrawTileSeqStruct *dtss, uint32 offset)
02007 {
02008   SpriteID palette = COMPANY_SPRITE_COLOUR(_local_company);
02009 
02010   DrawSprite(ground, PAL_NONE, x, y);
02011   for (; dtss->image.sprite != 0; dtss++) {
02012     Point pt = RemapCoords(dtss->delta_x, dtss->delta_y, dtss->delta_z);
02013     SpriteID image = dtss->image.sprite + offset;
02014 
02015     DrawSprite(image, HasBit(image, PALETTE_MODIFIER_COLOUR) ? palette : PAL_NONE, x + pt.x, y + pt.y);
02016   }
02017 }
02018 
02019 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
02020 {
02021   const DrawTileSprites *dts = &_depot_gfx_table[dir];
02022   SpriteID image = dts->ground.sprite;
02023   uint32 offset = GetRailTypeInfo(railtype)->total_offset;
02024 
02025   if (image != SPR_FLAT_GRASS_TILE) image += offset;
02026   DrawTileSequence(x + 33, y + 17, image, dts->seq, offset);
02027 }
02028 
02029 static uint GetSlopeZ_Track(TileIndex tile, uint x, uint y)
02030 {
02031   uint z;
02032   Slope tileh = GetTileSlope(tile, &z);
02033 
02034   if (tileh == SLOPE_FLAT) return z;
02035   if (IsPlainRail(tile)) {
02036     z += ApplyFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
02037     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
02038   } else {
02039     return z + TILE_HEIGHT;
02040   }
02041 }
02042 
02043 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
02044 {
02045   return IsPlainRail(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
02046 }
02047 
02048 static void TileLoop_Track(TileIndex tile)
02049 {
02050   RailGroundType old_ground = GetRailGroundType(tile);
02051   RailGroundType new_ground;
02052 
02053   if (old_ground == RAIL_GROUND_WATER) {
02054     TileLoop_Water(tile);
02055     return;
02056   }
02057 
02058   switch (_settings_game.game_creation.landscape) {
02059     case LT_ARCTIC: {
02060       uint z;
02061       Slope slope = GetTileSlope(tile, &z);
02062       bool half = false;
02063 
02064       /* for non-flat track, use lower part of track
02065        * in other cases, use the highest part with track */
02066       if (IsPlainRail(tile)) {
02067         TrackBits track = GetTrackBits(tile);
02068         Foundation f = GetRailFoundation(slope, track);
02069 
02070         switch (f) {
02071           case FOUNDATION_NONE:
02072             /* no foundation - is the track on the upper side of three corners raised tile? */
02073             if (IsSlopeWithThreeCornersRaised(slope)) z += TILE_HEIGHT;
02074             break;
02075 
02076           case FOUNDATION_INCLINED_X:
02077           case FOUNDATION_INCLINED_Y:
02078             /* sloped track - is it on a steep slope? */
02079             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
02080             break;
02081 
02082           case FOUNDATION_STEEP_LOWER:
02083             /* only lower part of steep slope */
02084             z += TILE_HEIGHT;
02085             break;
02086 
02087           default:
02088             /* if it is a steep slope, then there is a track on higher part */
02089             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
02090             z += TILE_HEIGHT;
02091             break;
02092         }
02093 
02094         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
02095       } else {
02096         /* is the depot on a non-flat tile? */
02097         if (slope != SLOPE_FLAT) z += TILE_HEIGHT;
02098       }
02099 
02100       /* 'z' is now the lowest part of the highest track bit -
02101        * for sloped track, it is 'z' of lower part
02102        * for two track bits, it is 'z' of higher track bit
02103        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
02104       if (z > GetSnowLine()) {
02105         if (half && z - GetSnowLine() == TILE_HEIGHT) {
02106           /* track on non-continuous foundation, lower part is not under snow */
02107           new_ground = RAIL_GROUND_HALF_SNOW;
02108         } else {
02109           new_ground = RAIL_GROUND_ICE_DESERT;
02110         }
02111         goto set_ground;
02112       }
02113       break;
02114       }
02115 
02116     case LT_TROPIC:
02117       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
02118         new_ground = RAIL_GROUND_ICE_DESERT;
02119         goto set_ground;
02120       }
02121       break;
02122   }
02123 
02124   if (!IsPlainRail(tile)) return;
02125 
02126   new_ground = RAIL_GROUND_GRASS;
02127 
02128   if (old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
02129     /* determine direction of fence */
02130     TrackBits rail = GetTrackBits(tile);
02131 
02132     switch (rail) {
02133       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
02134       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
02135       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
02136       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
02137 
02138       default: {
02139         Owner owner = GetTileOwner(tile);
02140 
02141         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
02142               (rail & TRACK_BIT_3WAY_NW) == 0 &&
02143               (rail & TRACK_BIT_X)
02144             )) {
02145           TileIndex n = tile + TileDiffXY(0, -1);
02146           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02147 
02148           if (!IsTileType(n, MP_RAILWAY) ||
02149               !IsTileOwner(n, owner) ||
02150               nrail == TRACK_BIT_UPPER ||
02151               nrail == TRACK_BIT_LEFT) {
02152             new_ground = RAIL_GROUND_FENCE_NW;
02153           }
02154         }
02155 
02156         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
02157               (rail & TRACK_BIT_3WAY_SE) == 0 &&
02158               (rail & TRACK_BIT_X)
02159             )) {
02160           TileIndex n = tile + TileDiffXY(0, 1);
02161           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02162 
02163           if (!IsTileType(n, MP_RAILWAY) ||
02164               !IsTileOwner(n, owner) ||
02165               nrail == TRACK_BIT_LOWER ||
02166               nrail == TRACK_BIT_RIGHT) {
02167             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
02168               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
02169           }
02170         }
02171 
02172         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
02173               (rail & TRACK_BIT_3WAY_NE) == 0 &&
02174               (rail & TRACK_BIT_Y)
02175             )) {
02176           TileIndex n = tile + TileDiffXY(-1, 0);
02177           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02178 
02179           if (!IsTileType(n, MP_RAILWAY) ||
02180               !IsTileOwner(n, owner) ||
02181               nrail == TRACK_BIT_UPPER ||
02182               nrail == TRACK_BIT_RIGHT) {
02183             new_ground = RAIL_GROUND_FENCE_NE;
02184           }
02185         }
02186 
02187         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
02188               (rail & TRACK_BIT_3WAY_SW) == 0 &&
02189               (rail & TRACK_BIT_Y)
02190             )) {
02191           TileIndex n = tile + TileDiffXY(1, 0);
02192           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02193 
02194           if (!IsTileType(n, MP_RAILWAY) ||
02195               !IsTileOwner(n, owner) ||
02196               nrail == TRACK_BIT_LOWER ||
02197               nrail == TRACK_BIT_LEFT) {
02198             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
02199               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
02200           }
02201         }
02202         break;
02203       }
02204     }
02205   }
02206 
02207 set_ground:
02208   if (old_ground != new_ground) {
02209     SetRailGroundType(tile, new_ground);
02210     MarkTileDirtyByTile(tile);
02211   }
02212 }
02213 
02214 
02215 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
02216 {
02217   /* Case of half tile slope with water. */
02218   if (mode == TRANSPORT_WATER && IsPlainRail(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
02219     TrackBits tb = GetTrackBits(tile);
02220     switch (tb) {
02221       default: NOT_REACHED();
02222       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
02223       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
02224       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
02225       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
02226     }
02227     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
02228   }
02229 
02230   if (mode != TRANSPORT_RAIL) return 0;
02231 
02232   TrackBits trackbits = TRACK_BIT_NONE;
02233   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
02234 
02235   switch (GetRailTileType(tile)) {
02236     default: NOT_REACHED();
02237     case RAIL_TILE_NORMAL:
02238       trackbits = GetTrackBits(tile);
02239       break;
02240 
02241     case RAIL_TILE_SIGNALS: {
02242       trackbits = GetTrackBits(tile);
02243       byte a = GetPresentSignals(tile);
02244       uint b = GetSignalStates(tile);
02245 
02246       b &= a;
02247 
02248       /* When signals are not present (in neither direction),
02249        * we pretend them to be green. Otherwise, it depends on
02250        * the signal type. For signals that are only active from
02251        * one side, we set the missing signals explicitely to
02252        * `green'. Otherwise, they implicitely become `red'. */
02253       if (!IsOnewaySignal(tile, TRACK_UPPER) || (a & SignalOnTrack(TRACK_UPPER)) == 0) b |= ~a & SignalOnTrack(TRACK_UPPER);
02254       if (!IsOnewaySignal(tile, TRACK_LOWER) || (a & SignalOnTrack(TRACK_LOWER)) == 0) b |= ~a & SignalOnTrack(TRACK_LOWER);
02255 
02256       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
02257       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
02258       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
02259       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
02260 
02261       break;
02262     }
02263 
02264     case RAIL_TILE_DEPOT: {
02265       DiagDirection dir = GetRailDepotDirection(tile);
02266 
02267       if (side != INVALID_DIAGDIR && side != dir) break;
02268 
02269       trackbits = DiagDirToDiagTrackBits(dir);
02270       break;
02271     }
02272   }
02273 
02274   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
02275 }
02276 
02277 static bool ClickTile_Track(TileIndex tile)
02278 {
02279   if (!IsRailDepot(tile)) return false;
02280 
02281   ShowDepotWindow(tile, VEH_TRAIN);
02282   return true;
02283 }
02284 
02285 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
02286 {
02287   td->owner[0] = GetTileOwner(tile);
02288   switch (GetRailTileType(tile)) {
02289     case RAIL_TILE_NORMAL:
02290       td->str = STR_LAI_RAIL_DESCRIPTION_TRACK;
02291       break;
02292 
02293     case RAIL_TILE_SIGNALS: {
02294       static const StringID signal_type[6][6] = {
02295         {
02296           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_SIGNALS,
02297           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
02298           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
02299           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
02300           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
02301           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS
02302         },
02303         {
02304           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
02305           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRESIGNALS,
02306           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
02307           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
02308           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
02309           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS
02310         },
02311         {
02312           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
02313           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
02314           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXITSIGNALS,
02315           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
02316           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
02317           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS
02318         },
02319         {
02320           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
02321           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
02322           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
02323           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBOSIGNALS,
02324           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
02325           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS
02326         },
02327         {
02328           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
02329           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
02330           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
02331           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
02332           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBSSIGNALS,
02333           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS
02334         },
02335         {
02336           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS,
02337           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS,
02338           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS,
02339           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS,
02340           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS,
02341           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NOENTRYSIGNALS
02342         }
02343       };
02344 
02345       SignalType primary_signal;
02346       SignalType secondary_signal;
02347       if (HasSignalOnTrack(tile, TRACK_UPPER)) {
02348         primary_signal = GetSignalType(tile, TRACK_UPPER);
02349         secondary_signal = HasSignalOnTrack(tile, TRACK_LOWER) ? GetSignalType(tile, TRACK_LOWER) : primary_signal;
02350       } else {
02351         secondary_signal = primary_signal = GetSignalType(tile, TRACK_LOWER);
02352       }
02353 
02354       td->str = signal_type[secondary_signal][primary_signal];
02355       break;
02356     }
02357 
02358     case RAIL_TILE_DEPOT:
02359       td->str = STR_LAI_RAIL_DESCRIPTION_TRAIN_DEPOT;
02360       break;
02361 
02362     default:
02363       NOT_REACHED();
02364   }
02365 }
02366 
02367 static void ChangeTileOwner_Track(TileIndex tile, Owner old_owner, Owner new_owner)
02368 {
02369   if (!IsTileOwner(tile, old_owner)) return;
02370 
02371   if (new_owner != INVALID_OWNER) {
02372     SetTileOwner(tile, new_owner);
02373   } else {
02374     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
02375   }
02376 }
02377 
02378 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
02379 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
02380 static const int8 _deltacoord_leaveoffset[8] = {
02381   -1,  0,  1,  0, /* x */
02382    0,  1,  0, -1  /* y */
02383 };
02384 
02385 
02391 int TicksToLeaveDepot(const Train *v)
02392 {
02393   DiagDirection dir = GetRailDepotDirection(v->tile);
02394   int length = v->tcache.cached_veh_length;
02395 
02396   switch (dir) {
02397     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
02398     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
02399     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
02400     default:
02401     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
02402   }
02403 
02404   return 0; // make compilers happy
02405 }
02406 
02409 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *u, TileIndex tile, int x, int y)
02410 {
02411   byte fract_coord;
02412   byte fract_coord_leave;
02413   DiagDirection dir;
02414   int length;
02415 
02416   /* this routine applies only to trains in depot tiles */
02417   if (u->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
02418 
02419   Train *v = Train::From(u);
02420 
02421   /* depot direction */
02422   dir = GetRailDepotDirection(tile);
02423 
02424   /* calculate the point where the following wagon should be activated
02425    * this depends on the length of the current vehicle */
02426   length = v->tcache.cached_veh_length;
02427 
02428   fract_coord_leave =
02429     ((_fractcoords_enter[dir] & 0x0F) + // x
02430       (length + 1) * _deltacoord_leaveoffset[dir]) +
02431     (((_fractcoords_enter[dir] >> 4) +  // y
02432       ((length + 1) * _deltacoord_leaveoffset[dir + 4])) << 4);
02433 
02434   fract_coord = (x & 0xF) + ((y & 0xF) << 4);
02435 
02436   if (_fractcoords_behind[dir] == fract_coord) {
02437     /* make sure a train is not entering the tile from behind */
02438     return VETSB_CANNOT_ENTER;
02439   } else if (_fractcoords_enter[dir] == fract_coord) {
02440     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
02441       /* enter the depot */
02442       v->track = TRACK_BIT_DEPOT,
02443       v->vehstatus |= VS_HIDDEN; // hide it
02444       v->direction = ReverseDir(v->direction);
02445       if (v->Next() == NULL) VehicleEnterDepot(v->First());
02446       v->tile = tile;
02447 
02448       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
02449       return VETSB_ENTERED_WORMHOLE;
02450     }
02451   } else if (fract_coord_leave == fract_coord) {
02452     if (DiagDirToDir(dir) == v->direction) {
02453       /* leave the depot? */
02454       if ((v = v->Next()) != NULL) {
02455         v->vehstatus &= ~VS_HIDDEN;
02456         v->track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
02457       }
02458     }
02459   }
02460 
02461   return VETSB_CONTINUE;
02462 }
02463 
02475 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, uint z_old, Slope tileh_old, uint z_new, Slope tileh_new, TrackBits rail_bits)
02476 {
02477   if (!_settings_game.construction.build_on_slopes || !AutoslopeEnabled()) return CMD_ERROR;
02478 
02479   /* Is the slope-rail_bits combination valid in general? I.e. is it safe to call GetRailFoundation() ? */
02480   if (CmdFailed(CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile))) return CMD_ERROR;
02481 
02482   /* Get the slopes on top of the foundations */
02483   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
02484   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
02485 
02486   Corner track_corner;
02487   switch (rail_bits) {
02488     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
02489     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
02490     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
02491     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
02492 
02493     /* Surface slope must not be changed */
02494     default: return (((z_old != z_new) || (tileh_old != tileh_new)) ? CMD_ERROR : CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]));
02495   }
02496 
02497   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
02498   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
02499   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
02500   if (z_old != z_new) return CMD_ERROR;
02501 
02502   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
02503   /* Make the ground dirty, if surface slope has changed */
02504   if (tileh_old != tileh_new) {
02505     /* If there is flat water on the lower halftile add the cost for clearing it */
02506     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price[PR_CLEAR_WATER]);
02507     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
02508   }
02509   return  cost;
02510 }
02511 
02512 static CommandCost TerraformTile_Track(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
02513 {
02514   uint z_old;
02515   Slope tileh_old = GetTileSlope(tile, &z_old);
02516   if (IsPlainRail(tile)) {
02517     TrackBits rail_bits = GetTrackBits(tile);
02518     /* Is there flat water on the lower halftile, that must be cleared expensively? */
02519     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
02520 
02521     _error_message = STR_ERROR_MUST_REMOVE_RAILROAD_TRACK;
02522 
02523     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
02524     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
02525 
02526     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
02527     Corner allowed_corner;
02528     switch (rail_bits) {
02529       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
02530       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
02531       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
02532       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
02533       default: return autoslope_result;
02534     }
02535 
02536     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
02537 
02538     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
02539     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
02540 
02541     /* Everything is valid, which only changes allowed_corner */
02542     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
02543       if (allowed_corner == corner) continue;
02544       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
02545     }
02546 
02547     /* Make the ground dirty */
02548     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
02549 
02550     /* allow terraforming */
02551     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price[PR_CLEAR_WATER] : (Money)0);
02552   } else if (_settings_game.construction.build_on_slopes && AutoslopeEnabled() &&
02553       AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) {
02554     return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
02555   }
02556   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
02557 }
02558 
02559 
02560 extern const TileTypeProcs _tile_type_rail_procs = {
02561   DrawTile_Track,           // draw_tile_proc
02562   GetSlopeZ_Track,          // get_slope_z_proc
02563   ClearTile_Track,          // clear_tile_proc
02564   NULL,                     // add_accepted_cargo_proc
02565   GetTileDesc_Track,        // get_tile_desc_proc
02566   GetTileTrackStatus_Track, // get_tile_track_status_proc
02567   ClickTile_Track,          // click_tile_proc
02568   NULL,                     // animate_tile_proc
02569   TileLoop_Track,           // tile_loop_clear
02570   ChangeTileOwner_Track,    // change_tile_owner_clear
02571   NULL,                     // add_produced_cargo_proc
02572   VehicleEnter_Track,       // vehicle_enter_tile_proc
02573   GetFoundation_Track,      // get_foundation_proc
02574   TerraformTile_Track,      // terraform_tile_proc
02575 };

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