rail_cmd.cpp

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00001 /* $Id$ */
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) {
00977       /* Extend the train's path if it's not stopped or loading, or not at a safe position. */
00978       if (!(((v->vehstatus & VS_STOPPED) && v->cur_speed == 0) || v->current_order.IsType(OT_LOADING)) ||
00979           !IsSafeWaitingPosition(v, v->tile, v->GetVehicleTrackdir(), true, _settings_game.pf.forbid_90_deg)) {
00980         TryPathReserve(v, true);
00981       }
00982     }
00983   }
00984 
00985   return cost;
00986 }
00987 
00988 static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
00989 {
00990   tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
00991   if (tile == INVALID_TILE) return false;
00992 
00993   /* Check for track bits on the new tile */
00994   TrackdirBits trackdirbits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
00995 
00996   if (TracksOverlap(TrackdirBitsToTrackBits(trackdirbits))) return false;
00997   trackdirbits &= TrackdirReachesTrackdirs(trackdir);
00998 
00999   /* No track bits, must stop */
01000   if (trackdirbits == TRACKDIR_BIT_NONE) return false;
01001 
01002   /* Get the first track dir */
01003   trackdir = RemoveFirstTrackdir(&trackdirbits);
01004 
01005   /* Any left? It's a junction so we stop */
01006   if (trackdirbits != TRACKDIR_BIT_NONE) return false;
01007 
01008   switch (GetTileType(tile)) {
01009     case MP_RAILWAY:
01010       if (IsRailDepot(tile)) return false;
01011       if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
01012       signal_ctr++;
01013       if (IsDiagonalTrackdir(trackdir)) {
01014         signal_ctr++;
01015         /* Ensure signal_ctr even so X and Y pieces get signals */
01016         ClrBit(signal_ctr, 0);
01017       }
01018       return true;
01019 
01020     case MP_ROAD:
01021       if (!IsLevelCrossing(tile)) return false;
01022       signal_ctr += 2;
01023       return true;
01024 
01025     case MP_TUNNELBRIDGE: {
01026       TileIndex orig_tile = tile; // backup old value
01027 
01028       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
01029       if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
01030 
01031       /* Skip to end of tunnel or bridge
01032        * note that tile is a parameter by reference, so it must be updated */
01033       tile = GetOtherTunnelBridgeEnd(tile);
01034 
01035       signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
01036       return true;
01037     }
01038 
01039     default: return false;
01040   }
01041 }
01042 
01058 static CommandCost CmdSignalTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01059 {
01060   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
01061   int signal_ctr;
01062   byte signals;
01063   bool err = true;
01064   TileIndex end_tile;
01065   TileIndex start_tile = tile;
01066 
01067   Track track = (Track)GB(p2, 0, 3);
01068   bool mode = HasBit(p2, 3);
01069   bool semaphores = HasBit(p2, 4);
01070   bool remove = HasBit(p2, 5);
01071   bool autofill = HasBit(p2, 6);
01072   Trackdir trackdir = TrackToTrackdir(track);
01073   byte signal_density = GB(p2, 24, 8);
01074 
01075   if (p1 >= MapSize()) return CMD_ERROR;
01076   end_tile = p1;
01077   if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
01078 
01079   if (!IsPlainRailTile(tile)) return CMD_ERROR;
01080 
01081   /* for vertical/horizontal tracks, double the given signals density
01082    * since the original amount will be too dense (shorter tracks) */
01083   signal_density *= 2;
01084 
01085   if (CmdFailed(ValidateAutoDrag(&trackdir, tile, end_tile))) return CMD_ERROR;
01086 
01087   track = TrackdirToTrack(trackdir); // trackdir might have changed, keep track in sync
01088   Trackdir start_trackdir = trackdir;
01089 
01090   /* Must start on a valid track to be able to avoid loops */
01091   if (!HasTrack(tile, track)) return CMD_ERROR;
01092 
01093   SignalType sigtype = (SignalType)GB(p2, 7, 3);
01094   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
01095 
01096   /* copy the signal-style of the first rail-piece if existing */
01097   if (HasSignalOnTrack(tile, track)) {
01098     signals = GetPresentSignals(tile) & SignalOnTrack(track);
01099     assert(signals != 0);
01100 
01101     /* copy signal/semaphores style (independent of CTRL) */
01102     semaphores = GetSignalVariant(tile, track) != SIG_ELECTRIC;
01103 
01104     sigtype = GetSignalType(tile, track);
01105     /* Don't but copy pre-signal type */
01106     if (sigtype < SIGTYPE_PBS) sigtype = SIGTYPE_NORMAL;
01107   } else { // no signals exist, drag a two-way signal stretch
01108     signals = IsPbsSignal(sigtype) ? SignalAlongTrackdir(trackdir) : SignalOnTrack(track);
01109   }
01110 
01111   byte signal_dir = 0;
01112   if (signals & SignalAlongTrackdir(trackdir))   SetBit(signal_dir, 0);
01113   if (signals & SignalAgainstTrackdir(trackdir)) SetBit(signal_dir, 1);
01114 
01115   /* signal_ctr         - amount of tiles already processed
01116    * signals_density    - setting to put signal on every Nth tile (double space on |, -- tracks)
01117    **********
01118    * trackdir   - trackdir to build with autorail
01119    * semaphores - semaphores or signals
01120    * signals    - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
01121    *              and convert all others to semaphore/signal
01122    * remove     - 1 remove signals, 0 build signals */
01123   signal_ctr = 0;
01124   for (;;) {
01125     /* only build/remove signals with the specified density */
01126     if ((remove && autofill) || signal_ctr % signal_density == 0) {
01127       uint32 p1 = GB(TrackdirToTrack(trackdir), 0, 3);
01128       SB(p1, 3, 1, mode);
01129       SB(p1, 4, 1, semaphores);
01130       SB(p1, 5, 3, sigtype);
01131       if (!remove && signal_ctr == 0) SetBit(p1, 17);
01132 
01133       /* Pick the correct orientation for the track direction */
01134       signals = 0;
01135       if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
01136       if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
01137 
01138       ret = DoCommand(tile, p1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
01139 
01140       /* Be user-friendly and try placing signals as much as possible */
01141       if (CmdSucceeded(ret)) {
01142         err = false;
01143         total_cost.AddCost(ret);
01144       }
01145     }
01146 
01147     if (autofill) {
01148       if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
01149 
01150       /* Prevent possible loops */
01151       if (tile == start_tile && trackdir == start_trackdir) break;
01152     } else {
01153       if (tile == end_tile) break;
01154 
01155       tile += ToTileIndexDiff(_trackdelta[trackdir]);
01156       signal_ctr++;
01157 
01158       /* toggle railbit for the non-diagonal tracks (|, -- tracks) */
01159       if (IsDiagonalTrackdir(trackdir)) {
01160         signal_ctr++;
01161       } else {
01162         ToggleBit(trackdir, 0);
01163       }
01164     }
01165   }
01166 
01167   return err ? CMD_ERROR : total_cost;
01168 }
01169 
01187 CommandCost CmdBuildSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01188 {
01189   return CmdSignalTrackHelper(tile, flags, p1, p2, text);
01190 }
01191 
01203 CommandCost CmdRemoveSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01204 {
01205   Track track = (Track)GB(p1, 0, 3);
01206 
01207   if (!ValParamTrackOrientation(track) ||
01208       !IsPlainRailTile(tile) ||
01209       !HasTrack(tile, track) ||
01210       !EnsureNoTrainOnTrack(tile, track) ||
01211       !HasSignalOnTrack(tile, track)) {
01212     return CMD_ERROR;
01213   }
01214 
01215   /* Only water can remove signals from anyone */
01216   if (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) return CMD_ERROR;
01217 
01218   /* Do it? */
01219   if (flags & DC_EXEC) {
01220     Train *v = NULL;
01221     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
01222       v = GetTrainForReservation(tile, track);
01223     } else if (IsPbsSignal(GetSignalType(tile, track))) {
01224       /* PBS signal, might be the end of a path reservation. */
01225       Trackdir td = TrackToTrackdir(track);
01226       for (int i = 0; v == NULL && i < 2; i++, td = ReverseTrackdir(td)) {
01227         /* Only test the active signal side. */
01228         if (!HasSignalOnTrackdir(tile, ReverseTrackdir(td))) continue;
01229         TileIndex next = TileAddByDiagDir(tile, TrackdirToExitdir(td));
01230         TrackBits tracks = TrackdirBitsToTrackBits(TrackdirReachesTrackdirs(td));
01231         if (HasReservedTracks(next, tracks)) {
01232           v = GetTrainForReservation(next, TrackBitsToTrack(GetReservedTrackbits(next) & tracks));
01233         }
01234       }
01235     }
01236     SetPresentSignals(tile, GetPresentSignals(tile) & ~SignalOnTrack(track));
01237 
01238     /* removed last signal from tile? */
01239     if (GetPresentSignals(tile) == 0) {
01240       SetSignalStates(tile, 0);
01241       SetHasSignals(tile, false);
01242       SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
01243     }
01244 
01245     AddTrackToSignalBuffer(tile, track, GetTileOwner(tile));
01246     YapfNotifyTrackLayoutChange(tile, track);
01247     if (v != NULL) TryPathReserve(v, false);
01248 
01249     MarkTileDirtyByTile(tile);
01250   }
01251 
01252   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_SIGNALS]);
01253 }
01254 
01272 CommandCost CmdRemoveSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01273 {
01274   return CmdSignalTrackHelper(tile, flags, p1, SetBit(p2, 5), text); // bit 5 is remove bit
01275 }
01276 
01278 static Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
01279 {
01280   if (v->type != VEH_TRAIN) return NULL;
01281 
01282   /* Similiar checks as in TrainPowerChanged() */
01283 
01284   Train *t = Train::From(v);
01285   if (t->IsArticulatedPart()) return NULL;
01286 
01287   const RailVehicleInfo *rvi = RailVehInfo(t->engine_type);
01288   if (GetVehicleProperty(t, PROP_TRAIN_POWER, rvi->power) != 0) TrainPowerChanged(t->First());
01289 
01290   return NULL;
01291 }
01292 
01302 CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01303 {
01304   CommandCost cost(EXPENSES_CONSTRUCTION);
01305   RailType totype = (RailType)p2;
01306 
01307   if (!ValParamRailtype(totype)) return CMD_ERROR;
01308   if (p1 >= MapSize()) return CMD_ERROR;
01309 
01310   uint ex = TileX(tile);
01311   uint ey = TileY(tile);
01312   uint sx = TileX(p1);
01313   uint sy = TileY(p1);
01314 
01315   /* make sure sx,sy are smaller than ex,ey */
01316   if (ex < sx) Swap(ex, sx);
01317   if (ey < sy) Swap(ey, sy);
01318 
01319   _error_message = STR_ERROR_NO_SUITABLE_RAILROAD_TRACK; // by default, there is no track to convert
01320 
01321   for (uint x = sx; x <= ex; ++x) {
01322     for (uint y = sy; y <= ey; ++y) {
01323       TileIndex tile = TileXY(x, y);
01324       TileType tt = GetTileType(tile);
01325 
01326       /* Check if there is any track on tile */
01327       switch (tt) {
01328         case MP_RAILWAY:
01329           break;
01330         case MP_STATION:
01331           if (!HasStationRail(tile)) continue;
01332           break;
01333         case MP_ROAD:
01334           if (!IsLevelCrossing(tile)) continue;
01335           break;
01336         case MP_TUNNELBRIDGE:
01337           if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
01338           break;
01339         default: continue;
01340       }
01341 
01342       /* Original railtype we are converting from */
01343       RailType type = GetRailType(tile);
01344 
01345       /* Converting to the same type or converting 'hidden' elrail -> rail */
01346       if (type == totype || (_settings_game.vehicle.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
01347 
01348       /* Trying to convert other's rail */
01349       if (!CheckTileOwnership(tile)) continue;
01350 
01351       SmallVector<Train *, 2> vehicles_affected;
01352 
01353       /* Vehicle on the tile when not converting Rail <-> ElRail
01354        * Tunnels and bridges have special check later */
01355       if (tt != MP_TUNNELBRIDGE) {
01356         if (!IsCompatibleRail(type, totype) && !EnsureNoVehicleOnGround(tile)) continue;
01357         if (flags & DC_EXEC) { // we can safely convert, too
01358           TrackBits reserved = GetReservedTrackbits(tile);
01359           Track     track;
01360           while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
01361             Train *v = GetTrainForReservation(tile, track);
01362             if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
01363               /* No power on new rail type, reroute. */
01364               FreeTrainTrackReservation(v);
01365               *vehicles_affected.Append() = v;
01366             }
01367           }
01368 
01369           SetRailType(tile, totype);
01370           MarkTileDirtyByTile(tile);
01371           /* update power of train engines on this tile */
01372           FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
01373         }
01374       }
01375 
01376       switch (tt) {
01377         case MP_RAILWAY:
01378           switch (GetRailTileType(tile)) {
01379             case RAIL_TILE_DEPOT:
01380               if (flags & DC_EXEC) {
01381                 /* notify YAPF about the track layout change */
01382                 YapfNotifyTrackLayoutChange(tile, GetRailDepotTrack(tile));
01383 
01384                 /* Update build vehicle window related to this depot */
01385                 InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
01386                 InvalidateWindowData(WC_BUILD_VEHICLE, tile);
01387               }
01388               cost.AddCost(RailConvertCost(type, totype));
01389               break;
01390 
01391             default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
01392               if (flags & DC_EXEC) {
01393                 /* notify YAPF about the track layout change */
01394                 TrackBits tracks = GetTrackBits(tile);
01395                 while (tracks != TRACK_BIT_NONE) {
01396                   YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
01397                 }
01398               }
01399               cost.AddCost(RailConvertCost(type, totype) * CountBits(GetTrackBits(tile)));
01400               break;
01401           }
01402           break;
01403 
01404         case MP_TUNNELBRIDGE: {
01405           TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
01406 
01407           /* If both ends of tunnel/bridge are in the range, do not try to convert twice -
01408            * it would cause assert because of different test and exec runs */
01409           if (endtile < tile && TileX(endtile) >= sx && TileX(endtile) <= ex &&
01410               TileY(endtile) >= sy && TileY(endtile) <= ey) continue;
01411 
01412           /* When not coverting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
01413           if (!IsCompatibleRail(GetRailType(tile), totype) &&
01414               HasVehicleOnTunnelBridge(tile, endtile)) continue;
01415 
01416           if (flags & DC_EXEC) {
01417             Track track = DiagDirToDiagTrack(GetTunnelBridgeDirection(tile));
01418             if (HasTunnelBridgeReservation(tile)) {
01419               Train *v = GetTrainForReservation(tile, track);
01420               if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
01421                 /* No power on new rail type, reroute. */
01422                 FreeTrainTrackReservation(v);
01423                 *vehicles_affected.Append() = v;
01424               }
01425             }
01426             SetRailType(tile, totype);
01427             SetRailType(endtile, totype);
01428 
01429             FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
01430             FindVehicleOnPos(endtile, NULL, &UpdateTrainPowerProc);
01431 
01432             YapfNotifyTrackLayoutChange(tile, track);
01433             YapfNotifyTrackLayoutChange(endtile, track);
01434 
01435             MarkTileDirtyByTile(tile);
01436             MarkTileDirtyByTile(endtile);
01437 
01438             if (IsBridge(tile)) {
01439               TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
01440               TileIndex t = tile + delta;
01441               for (; t != endtile; t += delta) MarkTileDirtyByTile(t); // TODO encapsulate this into a function
01442             }
01443           }
01444 
01445           cost.AddCost((GetTunnelBridgeLength(tile, endtile) + 2) * RailConvertCost(type, totype));
01446         } break;
01447 
01448         default: // MP_STATION, MP_ROAD
01449           if (flags & DC_EXEC) {
01450             Track track = ((tt == MP_STATION) ? GetRailStationTrack(tile) : GetCrossingRailTrack(tile));
01451             YapfNotifyTrackLayoutChange(tile, track);
01452           }
01453 
01454           cost.AddCost(RailConvertCost(type, totype));
01455           break;
01456       }
01457 
01458       for (uint i = 0; i < vehicles_affected.Length(); ++i) {
01459         TryPathReserve(vehicles_affected[i], true);
01460       }
01461     }
01462   }
01463 
01464   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
01465 }
01466 
01467 static CommandCost RemoveTrainDepot(TileIndex tile, DoCommandFlag flags)
01468 {
01469   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER)
01470     return CMD_ERROR;
01471 
01472   if (!EnsureNoVehicleOnGround(tile))
01473     return CMD_ERROR;
01474 
01475   if (flags & DC_EXEC) {
01476     /* read variables before the depot is removed */
01477     DiagDirection dir = GetRailDepotDirection(tile);
01478     Owner owner = GetTileOwner(tile);
01479     Train *v = NULL;
01480 
01481     if (HasDepotReservation(tile)) {
01482       v = GetTrainForReservation(tile, DiagDirToDiagTrack(dir));
01483       if (v != NULL) FreeTrainTrackReservation(v);
01484     }
01485 
01486     delete Depot::GetByTile(tile);
01487     DoClearSquare(tile);
01488     AddSideToSignalBuffer(tile, dir, owner);
01489     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
01490     if (v != NULL) TryPathReserve(v, true);
01491   }
01492 
01493   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_TRAIN]);
01494 }
01495 
01496 static CommandCost ClearTile_Track(TileIndex tile, DoCommandFlag flags)
01497 {
01498   CommandCost cost(EXPENSES_CONSTRUCTION);
01499   CommandCost ret;
01500 
01501   if (flags & DC_AUTO) {
01502     if (!IsTileOwner(tile, _current_company)) {
01503       return_cmd_error(STR_ERROR_AREA_IS_OWNED_BY_ANOTHER);
01504     }
01505 
01506     if (IsPlainRail(tile)) {
01507       return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
01508     } else {
01509       return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
01510     }
01511   }
01512 
01513   switch (GetRailTileType(tile)) {
01514     case RAIL_TILE_SIGNALS:
01515     case RAIL_TILE_NORMAL: {
01516       Slope tileh = GetTileSlope(tile, NULL);
01517       /* Is there flat water on the lower halftile, that gets cleared expensively? */
01518       bool water_ground = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh));
01519 
01520       TrackBits tracks = GetTrackBits(tile);
01521       while (tracks != TRACK_BIT_NONE) {
01522         Track track = RemoveFirstTrack(&tracks);
01523         ret = DoCommand(tile, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
01524         if (CmdFailed(ret)) return CMD_ERROR;
01525         cost.AddCost(ret);
01526       }
01527 
01528       /* when bankrupting, don't make water dirty, there could be a ship on lower halftile */
01529       if (water_ground && !(flags & DC_BANKRUPT)) {
01530         if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
01531 
01532         /* The track was removed, and left a coast tile. Now also clear the water. */
01533         if (flags & DC_EXEC) DoClearSquare(tile);
01534         cost.AddCost(_price[PR_CLEAR_WATER]);
01535       }
01536 
01537       return cost;
01538     }
01539 
01540     case RAIL_TILE_DEPOT:
01541       return RemoveTrainDepot(tile, flags);
01542 
01543     default:
01544       return CMD_ERROR;
01545   }
01546 }
01547 
01552 static uint GetSaveSlopeZ(uint x, uint y, Track track)
01553 {
01554   switch (track) {
01555     case TRACK_UPPER: x &= ~0xF; y &= ~0xF; break;
01556     case TRACK_LOWER: x |=  0xF; y |=  0xF; break;
01557     case TRACK_LEFT:  x |=  0xF; y &= ~0xF; break;
01558     case TRACK_RIGHT: x &= ~0xF; y |=  0xF; break;
01559     default: break;
01560   }
01561   return GetSlopeZ(x, y);
01562 }
01563 
01564 static void DrawSingleSignal(TileIndex tile, Track track, byte condition, uint image, uint pos)
01565 {
01566   bool side = (_settings_game.vehicle.road_side != 0) && _settings_game.construction.signal_side;
01567   static const Point SignalPositions[2][12] = {
01568     { // Signals on the left side
01569     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
01570       { 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
01571     /*  LOWER     LOWER     X         X         Y         Y     */
01572       {11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
01573     }, { // Signals on the right side
01574     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
01575       {14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
01576     /*  LOWER     LOWER     X         X         Y         Y     */
01577       {14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
01578     }
01579   };
01580 
01581   uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
01582   uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
01583 
01584   SpriteID sprite;
01585 
01586   SignalType type       = GetSignalType(tile, track);
01587   SignalVariant variant = GetSignalVariant(tile, track);
01588 
01589   if (type == SIGTYPE_NORMAL && variant == SIG_ELECTRIC) {
01590     /* Normal electric signals are picked from original sprites. */
01591     sprite = SPR_ORIGINAL_SIGNALS_BASE + image + condition;
01592   } else {
01593     /* All other signals are picked from add on sprites. */
01594     sprite = SPR_SIGNALS_BASE + (type - 1) * 16 + variant * 64 + image + condition + (type > SIGTYPE_LAST_NOPBS ? 64 : 0);
01595   }
01596 
01597   AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, GetSaveSlopeZ(x, y, track));
01598 }
01599 
01600 static uint32 _drawtile_track_palette;
01601 
01602 
01603 static void DrawTrackFence_NW(const TileInfo *ti, SpriteID base_image)
01604 {
01605   RailFenceOffset rfo = RFO_FLAT_X;
01606   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
01607   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01608     ti->x, ti->y + 1, 16, 1, 4, ti->z);
01609 }
01610 
01611 static void DrawTrackFence_SE(const TileInfo *ti, SpriteID base_image)
01612 {
01613   RailFenceOffset rfo = RFO_FLAT_X;
01614   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
01615   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01616     ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
01617 }
01618 
01619 static void DrawTrackFence_NW_SE(const TileInfo *ti, SpriteID base_image)
01620 {
01621   DrawTrackFence_NW(ti, base_image);
01622   DrawTrackFence_SE(ti, base_image);
01623 }
01624 
01625 static void DrawTrackFence_NE(const TileInfo *ti, SpriteID base_image)
01626 {
01627   RailFenceOffset rfo = RFO_FLAT_Y;
01628   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
01629   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01630     ti->x + 1, ti->y, 1, 16, 4, ti->z);
01631 }
01632 
01633 static void DrawTrackFence_SW(const TileInfo *ti, SpriteID base_image)
01634 {
01635   RailFenceOffset rfo = RFO_FLAT_Y;
01636   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
01637   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01638     ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
01639 }
01640 
01641 static void DrawTrackFence_NE_SW(const TileInfo *ti, SpriteID base_image)
01642 {
01643   DrawTrackFence_NE(ti, base_image);
01644   DrawTrackFence_SW(ti, base_image);
01645 }
01646 
01650 static void DrawTrackFence_NS_1(const TileInfo *ti, SpriteID base_image)
01651 {
01652   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_W);
01653   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
01654     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01655 }
01656 
01660 static void DrawTrackFence_NS_2(const TileInfo *ti, SpriteID base_image)
01661 {
01662   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_E);
01663   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
01664     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01665 }
01666 
01670 static void DrawTrackFence_WE_1(const TileInfo *ti, SpriteID base_image)
01671 {
01672   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_N);
01673   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
01674     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01675 }
01676 
01680 static void DrawTrackFence_WE_2(const TileInfo *ti, SpriteID base_image)
01681 {
01682   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_S);
01683   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
01684     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01685 }
01686 
01687 
01688 static void DrawTrackDetails(const TileInfo *ti)
01689 {
01690   /* Base sprite for track fences. */
01691   SpriteID base_image = SPR_TRACK_FENCE_FLAT_X;
01692 
01693   switch (GetRailGroundType(ti->tile)) {
01694     case RAIL_GROUND_FENCE_NW:     DrawTrackFence_NW(ti, base_image);    break;
01695     case RAIL_GROUND_FENCE_SE:     DrawTrackFence_SE(ti, base_image);    break;
01696     case RAIL_GROUND_FENCE_SENW:   DrawTrackFence_NW_SE(ti, base_image); break;
01697     case RAIL_GROUND_FENCE_NE:     DrawTrackFence_NE(ti, base_image);    break;
01698     case RAIL_GROUND_FENCE_SW:     DrawTrackFence_SW(ti, base_image);    break;
01699     case RAIL_GROUND_FENCE_NESW:   DrawTrackFence_NE_SW(ti, base_image); break;
01700     case RAIL_GROUND_FENCE_VERT1:  DrawTrackFence_NS_1(ti, base_image);  break;
01701     case RAIL_GROUND_FENCE_VERT2:  DrawTrackFence_NS_2(ti, base_image);  break;
01702     case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti, base_image);  break;
01703     case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti, base_image);  break;
01704     case RAIL_GROUND_WATER: {
01705       Corner track_corner;
01706       if (IsHalftileSlope(ti->tileh)) {
01707         /* Steep slope or one-corner-raised slope with halftile foundation */
01708         track_corner = GetHalftileSlopeCorner(ti->tileh);
01709       } else {
01710         /* Three-corner-raised slope */
01711         track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
01712       }
01713       switch (track_corner) {
01714         case CORNER_W: DrawTrackFence_NS_1(ti, base_image); break;
01715         case CORNER_S: DrawTrackFence_WE_2(ti, base_image); break;
01716         case CORNER_E: DrawTrackFence_NS_2(ti, base_image); break;
01717         case CORNER_N: DrawTrackFence_WE_1(ti, base_image); break;
01718         default: NOT_REACHED();
01719       }
01720       break;
01721     }
01722     default: break;
01723   }
01724 }
01725 
01726 
01732 static void DrawTrackBits(TileInfo *ti, TrackBits track)
01733 {
01734   /* SubSprite for drawing the track halftile of 'three-corners-raised'-sloped rail sprites. */
01735   static const int INF = 1000; // big number compared to tilesprite size
01736   static const SubSprite _halftile_sub_sprite[4] = {
01737     { -INF    , -INF  , 32 - 33, INF     }, // CORNER_W, clip 33 pixels from right
01738     { -INF    ,  0 + 7, INF    , INF     }, // CORNER_S, clip 7 pixels from top
01739     { -31 + 33, -INF  , INF    , INF     }, // CORNER_E, clip 33 pixels from left
01740     { -INF    , -INF  , INF    , 30 - 23 }  // CORNER_N, clip 23 pixels from bottom
01741   };
01742 
01743   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
01744   RailGroundType rgt = GetRailGroundType(ti->tile);
01745   Foundation f = GetRailFoundation(ti->tileh, track);
01746   Corner halftile_corner = CORNER_INVALID;
01747 
01748   if (IsNonContinuousFoundation(f)) {
01749     /* Save halftile corner */
01750     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
01751     /* Draw lower part first */
01752     track &= ~CornerToTrackBits(halftile_corner);
01753     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
01754   }
01755 
01756   DrawFoundation(ti, f);
01757   /* DrawFoundation modifies ti */
01758 
01759   SpriteID image;
01760   SpriteID pal = PAL_NONE;
01761   const SubSprite *sub = NULL;
01762   bool junction = false;
01763 
01764   /* Select the sprite to use. */
01765   if (track == 0) {
01766     /* Clear ground (only track on halftile foundation) */
01767     if (rgt == RAIL_GROUND_WATER) {
01768       if (IsSteepSlope(ti->tileh)) {
01769         DrawShoreTile(ti->tileh);
01770         image = 0;
01771       } else {
01772         image = SPR_FLAT_WATER_TILE;
01773       }
01774     } else {
01775       switch (rgt) {
01776         case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
01777         case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
01778         default:                     image = SPR_FLAT_GRASS_TILE; break;
01779       }
01780       image += _tileh_to_sprite[ti->tileh];
01781     }
01782   } else {
01783     if (ti->tileh != SLOPE_FLAT) {
01784       /* track on non-flat ground */
01785       image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
01786     } else {
01787       /* track on flat ground */
01788       (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
01789       (image++,                           track == TRACK_BIT_X) ||
01790       (image++,                           track == TRACK_BIT_UPPER) ||
01791       (image++,                           track == TRACK_BIT_LOWER) ||
01792       (image++,                           track == TRACK_BIT_RIGHT) ||
01793       (image++,                           track == TRACK_BIT_LEFT) ||
01794       (image++,                           track == TRACK_BIT_CROSS) ||
01795 
01796       (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
01797       (image++,                            track == TRACK_BIT_VERT) ||
01798 
01799       (junction = true, false) ||
01800       (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
01801       (image++,                          (track & TRACK_BIT_3WAY_SW) == 0) ||
01802       (image++,                          (track & TRACK_BIT_3WAY_NW) == 0) ||
01803       (image++,                          (track & TRACK_BIT_3WAY_SE) == 0) ||
01804       (image++, true);
01805     }
01806 
01807     switch (rgt) {
01808       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
01809       case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset;  break;
01810       case RAIL_GROUND_WATER: {
01811         /* three-corner-raised slope */
01812         DrawShoreTile(ti->tileh);
01813         Corner track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
01814         sub = &(_halftile_sub_sprite[track_corner]);
01815         break;
01816       }
01817       default: break;
01818     }
01819   }
01820 
01821   if (image != 0) DrawGroundSprite(image, pal, sub);
01822 
01823   /* Draw track pieces individually for junction tiles */
01824   if (junction) {
01825     if (track & TRACK_BIT_X)     DrawGroundSprite(rti->base_sprites.single_x, PAL_NONE);
01826     if (track & TRACK_BIT_Y)     DrawGroundSprite(rti->base_sprites.single_y, PAL_NONE);
01827     if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PAL_NONE);
01828     if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PAL_NONE);
01829     if (track & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PAL_NONE);
01830     if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PAL_NONE);
01831   }
01832 
01833   /* PBS debugging, draw reserved tracks darker */
01834   if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation) {
01835     /* Get reservation, but mask track on halftile slope */
01836     TrackBits pbs = GetRailReservationTrackBits(ti->tile) & track;
01837     if (pbs & TRACK_BIT_X) {
01838       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
01839         DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH);
01840       } else {
01841         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
01842       }
01843     }
01844     if (pbs & TRACK_BIT_Y) {
01845       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
01846         DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH);
01847       } else {
01848         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
01849       }
01850     }
01851     if (pbs & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_N ? -TILE_HEIGHT : 0);
01852     if (pbs & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_S ? -TILE_HEIGHT : 0);
01853     if (pbs & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_W ? -TILE_HEIGHT : 0);
01854     if (pbs & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_E ? -TILE_HEIGHT : 0);
01855   }
01856 
01857   if (IsValidCorner(halftile_corner)) {
01858     DrawFoundation(ti, HalftileFoundation(halftile_corner));
01859 
01860     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
01861     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
01862     image = _track_sloped_sprites[fake_slope - 1] + rti->base_sprites.track_y;
01863     pal = PAL_NONE;
01864     switch (rgt) {
01865       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
01866       case RAIL_GROUND_ICE_DESERT:
01867       case RAIL_GROUND_HALF_SNOW:  image += rti->snow_offset;  break; // higher part has snow in this case too
01868       default: break;
01869     }
01870     DrawGroundSprite(image, pal, &(_halftile_sub_sprite[halftile_corner]));
01871 
01872     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, CornerToTrackBits(halftile_corner))) {
01873       static const byte _corner_to_track_sprite[] = {3, 1, 2, 0};
01874       DrawGroundSprite(_corner_to_track_sprite[halftile_corner] + rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, -TILE_HEIGHT);
01875     }
01876   }
01877 }
01878 
01884 enum {
01885   SIGNAL_TO_SOUTHWEST =  0,
01886   SIGNAL_TO_NORTHEAST =  2,
01887   SIGNAL_TO_SOUTHEAST =  4,
01888   SIGNAL_TO_NORTHWEST =  6,
01889   SIGNAL_TO_EAST      =  8,
01890   SIGNAL_TO_WEST      = 10,
01891   SIGNAL_TO_SOUTH     = 12,
01892   SIGNAL_TO_NORTH     = 14,
01893 };
01894 
01895 static void DrawSignals(TileIndex tile, TrackBits rails)
01896 {
01897 #define MAYBE_DRAW_SIGNAL(x, y, z, t) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, t, GetSingleSignalState(tile, x), y, z)
01898 
01899   if (!(rails & TRACK_BIT_Y)) {
01900     if (!(rails & TRACK_BIT_X)) {
01901       if (rails & TRACK_BIT_LEFT) {
01902         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTH, 0, TRACK_LEFT);
01903         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTH, 1, TRACK_LEFT);
01904       }
01905       if (rails & TRACK_BIT_RIGHT) {
01906         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_NORTH, 2, TRACK_RIGHT);
01907         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_SOUTH, 3, TRACK_RIGHT);
01908       }
01909       if (rails & TRACK_BIT_UPPER) {
01910         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_WEST, 4, TRACK_UPPER);
01911         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_EAST, 5, TRACK_UPPER);
01912       }
01913       if (rails & TRACK_BIT_LOWER) {
01914         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_WEST, 6, TRACK_LOWER);
01915         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_EAST, 7, TRACK_LOWER);
01916       }
01917     } else {
01918       MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHWEST, 8, TRACK_X);
01919       MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHEAST, 9, TRACK_X);
01920     }
01921   } else {
01922     MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHEAST, 10, TRACK_Y);
01923     MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHWEST, 11, TRACK_Y);
01924   }
01925 }
01926 
01927 static void DrawTile_Track(TileInfo *ti)
01928 {
01929   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
01930   SpriteID image;
01931 
01932   _drawtile_track_palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
01933 
01934   if (IsPlainRail(ti->tile)) {
01935     TrackBits rails = GetTrackBits(ti->tile);
01936 
01937     DrawTrackBits(ti, rails);
01938 
01939     if (HasBit(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti);
01940 
01941     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01942 
01943     if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
01944   } else {
01945     /* draw depot */
01946     const DrawTileSprites *dts;
01947     const DrawTileSeqStruct *dtss;
01948     uint32 relocation;
01949     SpriteID pal = PAL_NONE;
01950 
01951     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01952 
01953     if (IsInvisibilitySet(TO_BUILDINGS)) {
01954       /* Draw rail instead of depot */
01955       dts = &_depot_invisible_gfx_table[GetRailDepotDirection(ti->tile)];
01956     } else {
01957       dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
01958     }
01959 
01960     relocation = rti->total_offset;
01961 
01962     image = dts->ground.sprite;
01963     if (image != SPR_FLAT_GRASS_TILE) image += rti->total_offset;
01964 
01965     /* adjust ground tile for desert
01966      * don't adjust for snow, because snow in depots looks weird */
01967     if (IsSnowRailGround(ti->tile) && _settings_game.game_creation.landscape == LT_TROPIC) {
01968       if (image != SPR_FLAT_GRASS_TILE) {
01969         image += rti->snow_offset; // tile with tracks
01970       } else {
01971         image = SPR_FLAT_SNOW_DESERT_TILE; // flat ground
01972       }
01973     }
01974 
01975     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, _drawtile_track_palette));
01976 
01977     /* PBS debugging, draw reserved tracks darker */
01978     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
01979       switch (GetRailDepotDirection(ti->tile)) {
01980         case DIAGDIR_SW: DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH); break;
01981         case DIAGDIR_SE: DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH); break;
01982         default: break;
01983       }
01984     }
01985 
01986     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01987 
01988     foreach_draw_tile_seq(dtss, dts->seq) {
01989       SpriteID image = dtss->image.sprite;
01990       SpriteID pal   = dtss->image.pal;
01991 
01992       /* Stop drawing sprite sequence once we meet a sprite that doesn't have to be opaque */
01993       if (IsInvisibilitySet(TO_BUILDINGS) && !HasBit(image, SPRITE_MODIFIER_OPAQUE)) return;
01994 
01995       /* Unlike stations, our default waypoint has no variation for
01996        * different railtype, so don't use the railtype offset if
01997        * no relocation is set */
01998       if (HasBit(image, SPRITE_MODIFIER_USE_OFFSET)) {
01999         image += rti->total_offset;
02000       } else {
02001         image += relocation;
02002       }
02003 
02004       pal = SpriteLayoutPaletteTransform(image, pal, _drawtile_track_palette);
02005 
02006       if ((byte)dtss->delta_z != 0x80) {
02007         AddSortableSpriteToDraw(
02008           image, pal,
02009           ti->x + dtss->delta_x, ti->y + dtss->delta_y,
02010           dtss->size_x, dtss->size_y,
02011           dtss->size_z, ti->z + dtss->delta_z,
02012           !HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(TO_BUILDINGS)
02013         );
02014       } else {
02015         /* For stations and original spritelayouts delta_x and delta_y are signed */
02016         AddChildSpriteScreen(image, pal, dtss->delta_x, dtss->delta_y, !HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(TO_BUILDINGS));
02017       }
02018     }
02019   }
02020   DrawBridgeMiddle(ti);
02021 }
02022 
02023 
02024 static void DrawTileSequence(int x, int y, SpriteID ground, const DrawTileSeqStruct *dtss, uint32 offset)
02025 {
02026   SpriteID palette = COMPANY_SPRITE_COLOUR(_local_company);
02027 
02028   DrawSprite(ground, PAL_NONE, x, y);
02029   for (; dtss->image.sprite != 0; dtss++) {
02030     Point pt = RemapCoords(dtss->delta_x, dtss->delta_y, dtss->delta_z);
02031     SpriteID image = dtss->image.sprite + offset;
02032 
02033     DrawSprite(image, HasBit(image, PALETTE_MODIFIER_COLOUR) ? palette : PAL_NONE, x + pt.x, y + pt.y);
02034   }
02035 }
02036 
02037 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
02038 {
02039   const DrawTileSprites *dts = &_depot_gfx_table[dir];
02040   SpriteID image = dts->ground.sprite;
02041   uint32 offset = GetRailTypeInfo(railtype)->total_offset;
02042 
02043   if (image != SPR_FLAT_GRASS_TILE) image += offset;
02044   DrawTileSequence(x + 33, y + 17, image, dts->seq, offset);
02045 }
02046 
02047 static uint GetSlopeZ_Track(TileIndex tile, uint x, uint y)
02048 {
02049   uint z;
02050   Slope tileh = GetTileSlope(tile, &z);
02051 
02052   if (tileh == SLOPE_FLAT) return z;
02053   if (IsPlainRail(tile)) {
02054     z += ApplyFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
02055     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
02056   } else {
02057     return z + TILE_HEIGHT;
02058   }
02059 }
02060 
02061 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
02062 {
02063   return IsPlainRail(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
02064 }
02065 
02066 static void TileLoop_Track(TileIndex tile)
02067 {
02068   RailGroundType old_ground = GetRailGroundType(tile);
02069   RailGroundType new_ground;
02070 
02071   if (old_ground == RAIL_GROUND_WATER) {
02072     TileLoop_Water(tile);
02073     return;
02074   }
02075 
02076   switch (_settings_game.game_creation.landscape) {
02077     case LT_ARCTIC: {
02078       uint z;
02079       Slope slope = GetTileSlope(tile, &z);
02080       bool half = false;
02081 
02082       /* for non-flat track, use lower part of track
02083        * in other cases, use the highest part with track */
02084       if (IsPlainRail(tile)) {
02085         TrackBits track = GetTrackBits(tile);
02086         Foundation f = GetRailFoundation(slope, track);
02087 
02088         switch (f) {
02089           case FOUNDATION_NONE:
02090             /* no foundation - is the track on the upper side of three corners raised tile? */
02091             if (IsSlopeWithThreeCornersRaised(slope)) z += TILE_HEIGHT;
02092             break;
02093 
02094           case FOUNDATION_INCLINED_X:
02095           case FOUNDATION_INCLINED_Y:
02096             /* sloped track - is it on a steep slope? */
02097             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
02098             break;
02099 
02100           case FOUNDATION_STEEP_LOWER:
02101             /* only lower part of steep slope */
02102             z += TILE_HEIGHT;
02103             break;
02104 
02105           default:
02106             /* if it is a steep slope, then there is a track on higher part */
02107             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
02108             z += TILE_HEIGHT;
02109             break;
02110         }
02111 
02112         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
02113       } else {
02114         /* is the depot on a non-flat tile? */
02115         if (slope != SLOPE_FLAT) z += TILE_HEIGHT;
02116       }
02117 
02118       /* 'z' is now the lowest part of the highest track bit -
02119        * for sloped track, it is 'z' of lower part
02120        * for two track bits, it is 'z' of higher track bit
02121        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
02122       if (z > GetSnowLine()) {
02123         if (half && z - GetSnowLine() == TILE_HEIGHT) {
02124           /* track on non-continuous foundation, lower part is not under snow */
02125           new_ground = RAIL_GROUND_HALF_SNOW;
02126         } else {
02127           new_ground = RAIL_GROUND_ICE_DESERT;
02128         }
02129         goto set_ground;
02130       }
02131       break;
02132       }
02133 
02134     case LT_TROPIC:
02135       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
02136         new_ground = RAIL_GROUND_ICE_DESERT;
02137         goto set_ground;
02138       }
02139       break;
02140   }
02141 
02142   if (!IsPlainRail(tile)) return;
02143 
02144   new_ground = RAIL_GROUND_GRASS;
02145 
02146   if (old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
02147     /* determine direction of fence */
02148     TrackBits rail = GetTrackBits(tile);
02149 
02150     switch (rail) {
02151       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
02152       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
02153       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
02154       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
02155 
02156       default: {
02157         Owner owner = GetTileOwner(tile);
02158 
02159         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
02160               (rail & TRACK_BIT_3WAY_NW) == 0 &&
02161               (rail & TRACK_BIT_X)
02162             )) {
02163           TileIndex n = tile + TileDiffXY(0, -1);
02164           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02165 
02166           if (!IsTileType(n, MP_RAILWAY) ||
02167               !IsTileOwner(n, owner) ||
02168               nrail == TRACK_BIT_UPPER ||
02169               nrail == TRACK_BIT_LEFT) {
02170             new_ground = RAIL_GROUND_FENCE_NW;
02171           }
02172         }
02173 
02174         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
02175               (rail & TRACK_BIT_3WAY_SE) == 0 &&
02176               (rail & TRACK_BIT_X)
02177             )) {
02178           TileIndex n = tile + TileDiffXY(0, 1);
02179           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02180 
02181           if (!IsTileType(n, MP_RAILWAY) ||
02182               !IsTileOwner(n, owner) ||
02183               nrail == TRACK_BIT_LOWER ||
02184               nrail == TRACK_BIT_RIGHT) {
02185             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
02186               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
02187           }
02188         }
02189 
02190         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
02191               (rail & TRACK_BIT_3WAY_NE) == 0 &&
02192               (rail & TRACK_BIT_Y)
02193             )) {
02194           TileIndex n = tile + TileDiffXY(-1, 0);
02195           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02196 
02197           if (!IsTileType(n, MP_RAILWAY) ||
02198               !IsTileOwner(n, owner) ||
02199               nrail == TRACK_BIT_UPPER ||
02200               nrail == TRACK_BIT_RIGHT) {
02201             new_ground = RAIL_GROUND_FENCE_NE;
02202           }
02203         }
02204 
02205         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
02206               (rail & TRACK_BIT_3WAY_SW) == 0 &&
02207               (rail & TRACK_BIT_Y)
02208             )) {
02209           TileIndex n = tile + TileDiffXY(1, 0);
02210           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02211 
02212           if (!IsTileType(n, MP_RAILWAY) ||
02213               !IsTileOwner(n, owner) ||
02214               nrail == TRACK_BIT_LOWER ||
02215               nrail == TRACK_BIT_LEFT) {
02216             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
02217               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
02218           }
02219         }
02220         break;
02221       }
02222     }
02223   }
02224 
02225 set_ground:
02226   if (old_ground != new_ground) {
02227     SetRailGroundType(tile, new_ground);
02228     MarkTileDirtyByTile(tile);
02229   }
02230 }
02231 
02232 
02233 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
02234 {
02235   /* Case of half tile slope with water. */
02236   if (mode == TRANSPORT_WATER && IsPlainRail(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
02237     TrackBits tb = GetTrackBits(tile);
02238     switch (tb) {
02239       default: NOT_REACHED();
02240       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
02241       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
02242       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
02243       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
02244     }
02245     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
02246   }
02247 
02248   if (mode != TRANSPORT_RAIL) return 0;
02249 
02250   TrackBits trackbits = TRACK_BIT_NONE;
02251   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
02252 
02253   switch (GetRailTileType(tile)) {
02254     default: NOT_REACHED();
02255     case RAIL_TILE_NORMAL:
02256       trackbits = GetTrackBits(tile);
02257       break;
02258 
02259     case RAIL_TILE_SIGNALS: {
02260       trackbits = GetTrackBits(tile);
02261       byte a = GetPresentSignals(tile);
02262       uint b = GetSignalStates(tile);
02263 
02264       b &= a;
02265 
02266       /* When signals are not present (in neither direction),
02267        * we pretend them to be green. Otherwise, it depends on
02268        * the signal type. For signals that are only active from
02269        * one side, we set the missing signals explicitely to
02270        * `green'. Otherwise, they implicitely become `red'. */
02271       if (!IsOnewaySignal(tile, TRACK_UPPER) || (a & SignalOnTrack(TRACK_UPPER)) == 0) b |= ~a & SignalOnTrack(TRACK_UPPER);
02272       if (!IsOnewaySignal(tile, TRACK_LOWER) || (a & SignalOnTrack(TRACK_LOWER)) == 0) b |= ~a & SignalOnTrack(TRACK_LOWER);
02273 
02274       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
02275       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
02276       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
02277       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
02278 
02279       break;
02280     }
02281 
02282     case RAIL_TILE_DEPOT: {
02283       DiagDirection dir = GetRailDepotDirection(tile);
02284 
02285       if (side != INVALID_DIAGDIR && side != dir) break;
02286 
02287       trackbits = DiagDirToDiagTrackBits(dir);
02288       break;
02289     }
02290   }
02291 
02292   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
02293 }
02294 
02295 static bool ClickTile_Track(TileIndex tile)
02296 {
02297   if (!IsRailDepot(tile)) return false;
02298 
02299   ShowDepotWindow(tile, VEH_TRAIN);
02300   return true;
02301 }
02302 
02303 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
02304 {
02305   td->owner[0] = GetTileOwner(tile);
02306   switch (GetRailTileType(tile)) {
02307     case RAIL_TILE_NORMAL:
02308       td->str = STR_LAI_RAIL_DESCRIPTION_TRACK;
02309       break;
02310 
02311     case RAIL_TILE_SIGNALS: {
02312       static const StringID signal_type[6][6] = {
02313         {
02314           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_SIGNALS,
02315           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
02316           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
02317           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
02318           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
02319           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS
02320         },
02321         {
02322           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
02323           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRESIGNALS,
02324           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
02325           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
02326           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
02327           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS
02328         },
02329         {
02330           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
02331           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
02332           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXITSIGNALS,
02333           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
02334           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
02335           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS
02336         },
02337         {
02338           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
02339           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
02340           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
02341           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBOSIGNALS,
02342           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
02343           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS
02344         },
02345         {
02346           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
02347           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
02348           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
02349           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
02350           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBSSIGNALS,
02351           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS
02352         },
02353         {
02354           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS,
02355           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS,
02356           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS,
02357           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS,
02358           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS,
02359           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NOENTRYSIGNALS
02360         }
02361       };
02362 
02363       SignalType primary_signal;
02364       SignalType secondary_signal;
02365       if (HasSignalOnTrack(tile, TRACK_UPPER)) {
02366         primary_signal = GetSignalType(tile, TRACK_UPPER);
02367         secondary_signal = HasSignalOnTrack(tile, TRACK_LOWER) ? GetSignalType(tile, TRACK_LOWER) : primary_signal;
02368       } else {
02369         secondary_signal = primary_signal = GetSignalType(tile, TRACK_LOWER);
02370       }
02371 
02372       td->str = signal_type[secondary_signal][primary_signal];
02373       break;
02374     }
02375 
02376     case RAIL_TILE_DEPOT:
02377       td->str = STR_LAI_RAIL_DESCRIPTION_TRAIN_DEPOT;
02378       break;
02379 
02380     default:
02381       NOT_REACHED();
02382   }
02383 }
02384 
02385 static void ChangeTileOwner_Track(TileIndex tile, Owner old_owner, Owner new_owner)
02386 {
02387   if (!IsTileOwner(tile, old_owner)) return;
02388 
02389   if (new_owner != INVALID_OWNER) {
02390     SetTileOwner(tile, new_owner);
02391   } else {
02392     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
02393   }
02394 }
02395 
02396 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
02397 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
02398 static const int8 _deltacoord_leaveoffset[8] = {
02399   -1,  0,  1,  0, /* x */
02400    0,  1,  0, -1  /* y */
02401 };
02402 
02403 
02409 int TicksToLeaveDepot(const Train *v)
02410 {
02411   DiagDirection dir = GetRailDepotDirection(v->tile);
02412   int length = v->tcache.cached_veh_length;
02413 
02414   switch (dir) {
02415     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
02416     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
02417     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
02418     default:
02419     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
02420   }
02421 
02422   return 0; // make compilers happy
02423 }
02424 
02427 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *u, TileIndex tile, int x, int y)
02428 {
02429   byte fract_coord;
02430   byte fract_coord_leave;
02431   DiagDirection dir;
02432   int length;
02433 
02434   /* this routine applies only to trains in depot tiles */
02435   if (u->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
02436 
02437   Train *v = Train::From(u);
02438 
02439   /* depot direction */
02440   dir = GetRailDepotDirection(tile);
02441 
02442   /* calculate the point where the following wagon should be activated
02443    * this depends on the length of the current vehicle */
02444   length = v->tcache.cached_veh_length;
02445 
02446   fract_coord_leave =
02447     ((_fractcoords_enter[dir] & 0x0F) + // x
02448       (length + 1) * _deltacoord_leaveoffset[dir]) +
02449     (((_fractcoords_enter[dir] >> 4) +  // y
02450       ((length + 1) * _deltacoord_leaveoffset[dir + 4])) << 4);
02451 
02452   fract_coord = (x & 0xF) + ((y & 0xF) << 4);
02453 
02454   if (_fractcoords_behind[dir] == fract_coord) {
02455     /* make sure a train is not entering the tile from behind */
02456     return VETSB_CANNOT_ENTER;
02457   } else if (_fractcoords_enter[dir] == fract_coord) {
02458     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
02459       /* enter the depot */
02460       v->track = TRACK_BIT_DEPOT,
02461       v->vehstatus |= VS_HIDDEN; // hide it
02462       v->direction = ReverseDir(v->direction);
02463       if (v->Next() == NULL) VehicleEnterDepot(v->First());
02464       v->tile = tile;
02465 
02466       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
02467       return VETSB_ENTERED_WORMHOLE;
02468     }
02469   } else if (fract_coord_leave == fract_coord) {
02470     if (DiagDirToDir(dir) == v->direction) {
02471       /* leave the depot? */
02472       if ((v = v->Next()) != NULL) {
02473         v->vehstatus &= ~VS_HIDDEN;
02474         v->track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
02475       }
02476     }
02477   }
02478 
02479   return VETSB_CONTINUE;
02480 }
02481 
02493 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, uint z_old, Slope tileh_old, uint z_new, Slope tileh_new, TrackBits rail_bits)
02494 {
02495   if (!_settings_game.construction.build_on_slopes || !AutoslopeEnabled()) return CMD_ERROR;
02496 
02497   /* Is the slope-rail_bits combination valid in general? I.e. is it safe to call GetRailFoundation() ? */
02498   if (CmdFailed(CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile))) return CMD_ERROR;
02499 
02500   /* Get the slopes on top of the foundations */
02501   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
02502   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
02503 
02504   Corner track_corner;
02505   switch (rail_bits) {
02506     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
02507     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
02508     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
02509     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
02510 
02511     /* Surface slope must not be changed */
02512     default: return (((z_old != z_new) || (tileh_old != tileh_new)) ? CMD_ERROR : CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]));
02513   }
02514 
02515   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
02516   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
02517   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
02518   if (z_old != z_new) return CMD_ERROR;
02519 
02520   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
02521   /* Make the ground dirty, if surface slope has changed */
02522   if (tileh_old != tileh_new) {
02523     /* If there is flat water on the lower halftile add the cost for clearing it */
02524     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price[PR_CLEAR_WATER]);
02525     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
02526   }
02527   return  cost;
02528 }
02529 
02530 static CommandCost TerraformTile_Track(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
02531 {
02532   uint z_old;
02533   Slope tileh_old = GetTileSlope(tile, &z_old);
02534   if (IsPlainRail(tile)) {
02535     TrackBits rail_bits = GetTrackBits(tile);
02536     /* Is there flat water on the lower halftile, that must be cleared expensively? */
02537     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
02538 
02539     _error_message = STR_ERROR_MUST_REMOVE_RAILROAD_TRACK;
02540 
02541     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
02542     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
02543 
02544     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
02545     Corner allowed_corner;
02546     switch (rail_bits) {
02547       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
02548       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
02549       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
02550       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
02551       default: return autoslope_result;
02552     }
02553 
02554     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
02555 
02556     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
02557     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
02558 
02559     /* Everything is valid, which only changes allowed_corner */
02560     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
02561       if (allowed_corner == corner) continue;
02562       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
02563     }
02564 
02565     /* Make the ground dirty */
02566     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
02567 
02568     /* allow terraforming */
02569     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price[PR_CLEAR_WATER] : (Money)0);
02570   } else if (_settings_game.construction.build_on_slopes && AutoslopeEnabled() &&
02571       AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) {
02572     return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
02573   }
02574   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
02575 }
02576 
02577 
02578 extern const TileTypeProcs _tile_type_rail_procs = {
02579   DrawTile_Track,           // draw_tile_proc
02580   GetSlopeZ_Track,          // get_slope_z_proc
02581   ClearTile_Track,          // clear_tile_proc
02582   NULL,                     // add_accepted_cargo_proc
02583   GetTileDesc_Track,        // get_tile_desc_proc
02584   GetTileTrackStatus_Track, // get_tile_track_status_proc
02585   ClickTile_Track,          // click_tile_proc
02586   NULL,                     // animate_tile_proc
02587   TileLoop_Track,           // tile_loop_clear
02588   ChangeTileOwner_Track,    // change_tile_owner_clear
02589   NULL,                     // add_produced_cargo_proc
02590   VehicleEnter_Track,       // vehicle_enter_tile_proc
02591   GetFoundation_Track,      // get_foundation_proc
02592   TerraformTile_Track,      // terraform_tile_proc
02593 };

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