# rail_cmd.cpp

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    00001 /* $Id: rail_cmd.cpp 18866 2010-01-18 22:57:21Z rubidium $ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
    00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
    00008  */
    00009
    00012 #include "stdafx.h"
    00013 #include "cmd_helper.h"
    00014 #include "landscape.h"
    00015 #include "viewport_func.h"
    00016 #include "command_func.h"
    00017 #include "engine_base.h"
    00018 #include "depot_base.h"
    00019 #include "pathfinder/yapf/yapf_cache.h"
    00020 #include "newgrf_engine.h"
    00021 #include "landscape_type.h"
    00022 #include "train.h"
    00023 #include "variables.h"
    00024 #include "autoslope.h"
    00025 #include "water.h"
    00026 #include "tunnelbridge_map.h"
    00027 #include "window_func.h"
    00028 #include "vehicle_func.h"
    00029 #include "sound_func.h"
    00030 #include "tunnelbridge.h"
    00031 #include "functions.h"
    00032 #include "elrail_func.h"
    00033 #include "town.h"
    00034 #include "pbs.h"
    00035 #include "company_base.h"
    00036
    00037 #include "table/strings.h"
    00038 #include "table/sprites.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 (ret.Failed()) 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 (ret.Failed()) 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 (ret.Failed()) return ret;
    00419       cost.AddCost(ret);
    00420
    00421       ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00422       if (ret.Failed()) 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 (DoCommand(t, 0, FIND_FIRST_BIT(to_remove), DC_EXEC, CMD_REMOVE_SINGLE_RAIL).Failed()) 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 (ValidateAutoDrag(&trackdir, tile, end_tile).Failed()) 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 (ret.Failed()) {
    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 (cost.Failed()) 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 (ValidateAutoDrag(&trackdir, tile, end_tile).Failed()) 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 (ret.Succeeded()) {
    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   /* Similar checks as in Train::PowerChanged() */
    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) t->First()->PowerChanged();
    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 (ret.Failed()) 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     SpriteID pal = PAL_NONE;
    01948
    01949     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
    01950
    01951     if (IsInvisibilitySet(TO_BUILDINGS)) {
    01952       /* Draw rail instead of depot */
    01953       dts = &_depot_invisible_gfx_table[GetRailDepotDirection(ti->tile)];
    01954     } else {
    01955       dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
    01956     }
    01957
    01958     image = dts->ground.sprite;
    01959     if (image != SPR_FLAT_GRASS_TILE) image += rti->total_offset;
    01960
    01961     /* adjust ground tile for desert
    01962      * don't adjust for snow, because snow in depots looks weird */
    01963     if (IsSnowRailGround(ti->tile) && _settings_game.game_creation.landscape == LT_TROPIC) {
    01964       if (image != SPR_FLAT_GRASS_TILE) {
    01965         image += rti->snow_offset; // tile with tracks
    01966       } else {
    01967         image = SPR_FLAT_SNOW_DESERT_TILE; // flat ground
    01968       }
    01969     }
    01970
    01971     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, _drawtile_track_palette));
    01972
    01973     /* PBS debugging, draw reserved tracks darker */
    01974     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
    01975       switch (GetRailDepotDirection(ti->tile)) {
    01976         case DIAGDIR_SW: DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH); break;
    01977         case DIAGDIR_SE: DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH); break;
    01978         default: break;
    01979       }
    01980     }
    01981
    01982     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    01983
    01984     /* No NewGRF depots, so no relocation */
    01985     DrawRailTileSeq(ti, dts, TO_BUILDINGS, rti->total_offset, 0, _drawtile_track_palette);
    01986   }
    01987   DrawBridgeMiddle(ti);
    01988 }
    01989
    01990 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
    01991 {
    01992   const DrawTileSprites *dts = &_depot_gfx_table[dir];
    01993   SpriteID image = dts->ground.sprite;
    01994   uint32 offset = GetRailTypeInfo(railtype)->total_offset;
    01995
    01996   x += 33;
    01997   y += 17;
    01998
    01999   if (image != SPR_FLAT_GRASS_TILE) image += offset;
    02000   SpriteID palette = COMPANY_SPRITE_COLOUR(_local_company);
    02001
    02002   DrawSprite(image, PAL_NONE, x, y);
    02003   DrawRailTileSeqInGUI(x, y, dts, offset, 0, palette);
    02004 }
    02005
    02006 static uint GetSlopeZ_Track(TileIndex tile, uint x, uint y)
    02007 {
    02008   uint z;
    02009   Slope tileh = GetTileSlope(tile, &z);
    02010
    02011   if (tileh == SLOPE_FLAT) return z;
    02012   if (IsPlainRail(tile)) {
    02013     z += ApplyFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
    02014     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
    02015   } else {
    02016     return z + TILE_HEIGHT;
    02017   }
    02018 }
    02019
    02020 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
    02021 {
    02022   return IsPlainRail(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
    02023 }
    02024
    02025 static void TileLoop_Track(TileIndex tile)
    02026 {
    02027   RailGroundType old_ground = GetRailGroundType(tile);
    02028   RailGroundType new_ground;
    02029
    02030   if (old_ground == RAIL_GROUND_WATER) {
    02031     TileLoop_Water(tile);
    02032     return;
    02033   }
    02034
    02035   switch (_settings_game.game_creation.landscape) {
    02036     case LT_ARCTIC: {
    02037       uint z;
    02038       Slope slope = GetTileSlope(tile, &z);
    02039       bool half = false;
    02040
    02041       /* for non-flat track, use lower part of track
    02042        * in other cases, use the highest part with track */
    02043       if (IsPlainRail(tile)) {
    02044         TrackBits track = GetTrackBits(tile);
    02045         Foundation f = GetRailFoundation(slope, track);
    02046
    02047         switch (f) {
    02048           case FOUNDATION_NONE:
    02049             /* no foundation - is the track on the upper side of three corners raised tile? */
    02050             if (IsSlopeWithThreeCornersRaised(slope)) z += TILE_HEIGHT;
    02051             break;
    02052
    02053           case FOUNDATION_INCLINED_X:
    02054           case FOUNDATION_INCLINED_Y:
    02055             /* sloped track - is it on a steep slope? */
    02056             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    02057             break;
    02058
    02059           case FOUNDATION_STEEP_LOWER:
    02060             /* only lower part of steep slope */
    02061             z += TILE_HEIGHT;
    02062             break;
    02063
    02064           default:
    02065             /* if it is a steep slope, then there is a track on higher part */
    02066             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    02067             z += TILE_HEIGHT;
    02068             break;
    02069         }
    02070
    02071         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
    02072       } else {
    02073         /* is the depot on a non-flat tile? */
    02074         if (slope != SLOPE_FLAT) z += TILE_HEIGHT;
    02075       }
    02076
    02077       /* 'z' is now the lowest part of the highest track bit -
    02078        * for sloped track, it is 'z' of lower part
    02079        * for two track bits, it is 'z' of higher track bit
    02080        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
    02081       if (z > GetSnowLine()) {
    02082         if (half && z - GetSnowLine() == TILE_HEIGHT) {
    02083           /* track on non-continuous foundation, lower part is not under snow */
    02084           new_ground = RAIL_GROUND_HALF_SNOW;
    02085         } else {
    02086           new_ground = RAIL_GROUND_ICE_DESERT;
    02087         }
    02088         goto set_ground;
    02089       }
    02090       break;
    02091       }
    02092
    02093     case LT_TROPIC:
    02094       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
    02095         new_ground = RAIL_GROUND_ICE_DESERT;
    02096         goto set_ground;
    02097       }
    02098       break;
    02099   }
    02100
    02101   if (!IsPlainRail(tile)) return;
    02102
    02103   new_ground = RAIL_GROUND_GRASS;
    02104
    02105   if (old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
    02106     /* determine direction of fence */
    02107     TrackBits rail = GetTrackBits(tile);
    02108
    02109     switch (rail) {
    02110       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
    02111       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
    02112       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
    02113       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
    02114
    02115       default: {
    02116         Owner owner = GetTileOwner(tile);
    02117
    02118         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
    02119               (rail & TRACK_BIT_3WAY_NW) == 0 &&
    02120               (rail & TRACK_BIT_X)
    02121             )) {
    02122           TileIndex n = tile + TileDiffXY(0, -1);
    02123           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02124
    02125           if (!IsTileType(n, MP_RAILWAY) ||
    02126               !IsTileOwner(n, owner) ||
    02127               nrail == TRACK_BIT_UPPER ||
    02128               nrail == TRACK_BIT_LEFT) {
    02129             new_ground = RAIL_GROUND_FENCE_NW;
    02130           }
    02131         }
    02132
    02133         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
    02134               (rail & TRACK_BIT_3WAY_SE) == 0 &&
    02135               (rail & TRACK_BIT_X)
    02136             )) {
    02137           TileIndex n = tile + TileDiffXY(0, 1);
    02138           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02139
    02140           if (!IsTileType(n, MP_RAILWAY) ||
    02141               !IsTileOwner(n, owner) ||
    02142               nrail == TRACK_BIT_LOWER ||
    02143               nrail == TRACK_BIT_RIGHT) {
    02144             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
    02145               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
    02146           }
    02147         }
    02148
    02149         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
    02150               (rail & TRACK_BIT_3WAY_NE) == 0 &&
    02151               (rail & TRACK_BIT_Y)
    02152             )) {
    02153           TileIndex n = tile + TileDiffXY(-1, 0);
    02154           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02155
    02156           if (!IsTileType(n, MP_RAILWAY) ||
    02157               !IsTileOwner(n, owner) ||
    02158               nrail == TRACK_BIT_UPPER ||
    02159               nrail == TRACK_BIT_RIGHT) {
    02160             new_ground = RAIL_GROUND_FENCE_NE;
    02161           }
    02162         }
    02163
    02164         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
    02165               (rail & TRACK_BIT_3WAY_SW) == 0 &&
    02166               (rail & TRACK_BIT_Y)
    02167             )) {
    02168           TileIndex n = tile + TileDiffXY(1, 0);
    02169           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02170
    02171           if (!IsTileType(n, MP_RAILWAY) ||
    02172               !IsTileOwner(n, owner) ||
    02173               nrail == TRACK_BIT_LOWER ||
    02174               nrail == TRACK_BIT_LEFT) {
    02175             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
    02176               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
    02177           }
    02178         }
    02179         break;
    02180       }
    02181     }
    02182   }
    02183
    02184 set_ground:
    02185   if (old_ground != new_ground) {
    02186     SetRailGroundType(tile, new_ground);
    02187     MarkTileDirtyByTile(tile);
    02188   }
    02189 }
    02190
    02191
    02192 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
    02193 {
    02194   /* Case of half tile slope with water. */
    02195   if (mode == TRANSPORT_WATER && IsPlainRail(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
    02196     TrackBits tb = GetTrackBits(tile);
    02197     switch (tb) {
    02198       default: NOT_REACHED();
    02199       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
    02200       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
    02201       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
    02202       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
    02203     }
    02204     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
    02205   }
    02206
    02207   if (mode != TRANSPORT_RAIL) return 0;
    02208
    02209   TrackBits trackbits = TRACK_BIT_NONE;
    02210   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
    02211
    02212   switch (GetRailTileType(tile)) {
    02213     default: NOT_REACHED();
    02214     case RAIL_TILE_NORMAL:
    02215       trackbits = GetTrackBits(tile);
    02216       break;
    02217
    02218     case RAIL_TILE_SIGNALS: {
    02219       trackbits = GetTrackBits(tile);
    02220       byte a = GetPresentSignals(tile);
    02221       uint b = GetSignalStates(tile);
    02222
    02223       b &= a;
    02224
    02225       /* When signals are not present (in neither direction),
    02226        * we pretend them to be green. Otherwise, it depends on
    02227        * the signal type. For signals that are only active from
    02228        * one side, we set the missing signals explicitely to
    02229        * `green'. Otherwise, they implicitely become `red'. */
    02230       if (!IsOnewaySignal(tile, TRACK_UPPER) || (a & SignalOnTrack(TRACK_UPPER)) == 0) b |= ~a & SignalOnTrack(TRACK_UPPER);
    02231       if (!IsOnewaySignal(tile, TRACK_LOWER) || (a & SignalOnTrack(TRACK_LOWER)) == 0) b |= ~a & SignalOnTrack(TRACK_LOWER);
    02232
    02233       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
    02234       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
    02235       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
    02236       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
    02237
    02238       break;
    02239     }
    02240
    02241     case RAIL_TILE_DEPOT: {
    02242       DiagDirection dir = GetRailDepotDirection(tile);
    02243
    02244       if (side != INVALID_DIAGDIR && side != dir) break;
    02245
    02246       trackbits = DiagDirToDiagTrackBits(dir);
    02247       break;
    02248     }
    02249   }
    02250
    02251   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
    02252 }
    02253
    02254 static bool ClickTile_Track(TileIndex tile)
    02255 {
    02256   if (!IsRailDepot(tile)) return false;
    02257
    02258   ShowDepotWindow(tile, VEH_TRAIN);
    02259   return true;
    02260 }
    02261
    02262 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
    02263 {
    02264   td->owner[0] = GetTileOwner(tile);
    02265   switch (GetRailTileType(tile)) {
    02266     case RAIL_TILE_NORMAL:
    02267       td->str = STR_LAI_RAIL_DESCRIPTION_TRACK;
    02268       break;
    02269
    02270     case RAIL_TILE_SIGNALS: {
    02271       static const StringID signal_type[6][6] = {
    02272         {
    02273           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_SIGNALS,
    02274           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
    02275           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
    02276           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02277           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
    02278           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS
    02279         },
    02280         {
    02281           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
    02282           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRESIGNALS,
    02283           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
    02284           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
    02285           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
    02286           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS
    02287         },
    02288         {
    02289           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
    02290           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
    02291           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXITSIGNALS,
    02292           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
    02293           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
    02294           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS
    02295         },
    02296         {
    02297           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02298           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
    02299           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
    02300           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBOSIGNALS,
    02301           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
    02302           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS
    02303         },
    02304         {
    02305           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
    02306           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
    02307           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
    02308           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
    02309           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBSSIGNALS,
    02310           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS
    02311         },
    02312         {
    02313           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS,
    02314           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS,
    02315           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS,
    02316           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS,
    02317           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS,
    02318           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NOENTRYSIGNALS
    02319         }
    02320       };
    02321
    02322       SignalType primary_signal;
    02323       SignalType secondary_signal;
    02324       if (HasSignalOnTrack(tile, TRACK_UPPER)) {
    02325         primary_signal = GetSignalType(tile, TRACK_UPPER);
    02326         secondary_signal = HasSignalOnTrack(tile, TRACK_LOWER) ? GetSignalType(tile, TRACK_LOWER) : primary_signal;
    02327       } else {
    02328         secondary_signal = primary_signal = GetSignalType(tile, TRACK_LOWER);
    02329       }
    02330
    02331       td->str = signal_type[secondary_signal][primary_signal];
    02332       break;
    02333     }
    02334
    02335     case RAIL_TILE_DEPOT:
    02336       td->str = STR_LAI_RAIL_DESCRIPTION_TRAIN_DEPOT;
    02337       break;
    02338
    02339     default:
    02340       NOT_REACHED();
    02341   }
    02342 }
    02343
    02344 static void ChangeTileOwner_Track(TileIndex tile, Owner old_owner, Owner new_owner)
    02345 {
    02346   if (!IsTileOwner(tile, old_owner)) return;
    02347
    02348   if (new_owner != INVALID_OWNER) {
    02349     SetTileOwner(tile, new_owner);
    02350   } else {
    02351     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
    02352   }
    02353 }
    02354
    02355 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
    02356 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
    02357 static const int8 _deltacoord_leaveoffset[8] = {
    02358   -1,  0,  1,  0, /* x */
    02359    0,  1,  0, -1  /* y */
    02360 };
    02361
    02362
    02368 int TicksToLeaveDepot(const Train *v)
    02369 {
    02370   DiagDirection dir = GetRailDepotDirection(v->tile);
    02371   int length = v->tcache.cached_veh_length;
    02372
    02373   switch (dir) {
    02374     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
    02375     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
    02376     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
    02377     default:
    02378     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
    02379   }
    02380
    02381   return 0; // make compilers happy
    02382 }
    02383
    02386 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *u, TileIndex tile, int x, int y)
    02387 {
    02388   byte fract_coord;
    02389   byte fract_coord_leave;
    02390   DiagDirection dir;
    02391   int length;
    02392
    02393   /* this routine applies only to trains in depot tiles */
    02394   if (u->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
    02395
    02396   Train *v = Train::From(u);
    02397
    02398   /* depot direction */
    02399   dir = GetRailDepotDirection(tile);
    02400
    02401   /* calculate the point where the following wagon should be activated
    02402    * this depends on the length of the current vehicle */
    02403   length = v->tcache.cached_veh_length;
    02404
    02405   fract_coord_leave =
    02406     ((_fractcoords_enter[dir] & 0x0F) + // x
    02407       (length + 1) * _deltacoord_leaveoffset[dir]) +
    02408     (((_fractcoords_enter[dir] >> 4) +  // y
    02409       ((length + 1) * _deltacoord_leaveoffset[dir + 4])) << 4);
    02410
    02411   fract_coord = (x & 0xF) + ((y & 0xF) << 4);
    02412
    02413   if (_fractcoords_behind[dir] == fract_coord) {
    02414     /* make sure a train is not entering the tile from behind */
    02415     return VETSB_CANNOT_ENTER;
    02416   } else if (_fractcoords_enter[dir] == fract_coord) {
    02417     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
    02418       /* enter the depot */
    02419       v->track = TRACK_BIT_DEPOT,
    02420       v->vehstatus |= VS_HIDDEN; // hide it
    02421       v->direction = ReverseDir(v->direction);
    02422       if (v->Next() == NULL) VehicleEnterDepot(v->First());
    02423       v->tile = tile;
    02424
    02425       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
    02426       return VETSB_ENTERED_WORMHOLE;
    02427     }
    02428   } else if (fract_coord_leave == fract_coord) {
    02429     if (DiagDirToDir(dir) == v->direction) {
    02430       /* leave the depot? */
    02431       if ((v = v->Next()) != NULL) {
    02432         v->vehstatus &= ~VS_HIDDEN;
    02433         v->track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
    02434       }
    02435     }
    02436   }
    02437
    02438   return VETSB_CONTINUE;
    02439 }
    02440
    02452 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, uint z_old, Slope tileh_old, uint z_new, Slope tileh_new, TrackBits rail_bits)
    02453 {
    02454   if (!_settings_game.construction.build_on_slopes || !AutoslopeEnabled()) return CMD_ERROR;
    02455
    02456   /* Is the slope-rail_bits combination valid in general? I.e. is it safe to call GetRailFoundation() ? */
    02457   if (CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile).Failed()) return CMD_ERROR;
    02458
    02459   /* Get the slopes on top of the foundations */
    02460   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
    02461   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
    02462
    02463   Corner track_corner;
    02464   switch (rail_bits) {
    02465     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
    02466     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
    02467     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
    02468     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
    02469
    02470     /* Surface slope must not be changed */
    02471     default: return (((z_old != z_new) || (tileh_old != tileh_new)) ? CMD_ERROR : CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]));
    02472   }
    02473
    02474   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
    02475   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
    02476   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
    02477   if (z_old != z_new) return CMD_ERROR;
    02478
    02479   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    02480   /* Make the ground dirty, if surface slope has changed */
    02481   if (tileh_old != tileh_new) {
    02482     /* If there is flat water on the lower halftile add the cost for clearing it */
    02483     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price[PR_CLEAR_WATER]);
    02484     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02485   }
    02486   return  cost;
    02487 }
    02488
    02489 static CommandCost TerraformTile_Track(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
    02490 {
    02491   uint z_old;
    02492   Slope tileh_old = GetTileSlope(tile, &z_old);
    02493   if (IsPlainRail(tile)) {
    02494     TrackBits rail_bits = GetTrackBits(tile);
    02495     /* Is there flat water on the lower halftile, that must be cleared expensively? */
    02496     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
    02497
    02498     _error_message = STR_ERROR_MUST_REMOVE_RAILROAD_TRACK;
    02499
    02500     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
    02501     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
    02502
    02503     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
    02504     Corner allowed_corner;
    02505     switch (rail_bits) {
    02506       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
    02507       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
    02508       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
    02509       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
    02510       default: return autoslope_result;
    02511     }
    02512
    02513     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
    02514
    02515     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
    02516     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
    02517
    02518     /* Everything is valid, which only changes allowed_corner */
    02519     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
    02520       if (allowed_corner == corner) continue;
    02521       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
    02522     }
    02523
    02524     /* Make the ground dirty */
    02525     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02526
    02527     /* allow terraforming */
    02528     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price[PR_CLEAR_WATER] : (Money)0);
    02529   } else if (_settings_game.construction.build_on_slopes && AutoslopeEnabled() &&
    02530       AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) {
    02531     return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    02532   }
    02533   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    02534 }
    02535
    02536
    02537 extern const TileTypeProcs _tile_type_rail_procs = {
    02538   DrawTile_Track,           // draw_tile_proc
    02539   GetSlopeZ_Track,          // get_slope_z_proc
    02540   ClearTile_Track,          // clear_tile_proc
    02541   NULL,                     // add_accepted_cargo_proc
    02542   GetTileDesc_Track,        // get_tile_desc_proc
    02543   GetTileTrackStatus_Track, // get_tile_track_status_proc
    02544   ClickTile_Track,          // click_tile_proc
    02545   NULL,                     // animate_tile_proc
    02546   TileLoop_Track,           // tile_loop_clear
    02547   ChangeTileOwner_Track,    // change_tile_owner_clear
    02548   NULL,                     // add_produced_cargo_proc
    02549   VehicleEnter_Track,       // vehicle_enter_tile_proc
    02550   GetFoundation_Track,      // get_foundation_proc
    02551   TerraformTile_Track,      // terraform_tile_proc
    02552 };