# rail_cmd.cpp

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    00001 /* $Id: rail_cmd.cpp 15718 2009-03-15 00:32:18Z rubidium $ */
    00002
    00005 #include "stdafx.h"
    00006 #include "openttd.h"
    00007 #include "cmd_helper.h"
    00008 #include "landscape.h"
    00009 #include "town_map.h"
    00010 #include "viewport_func.h"
    00011 #include "command_func.h"
    00012 #include "engine_base.h"
    00013 #include "depot_base.h"
    00014 #include "waypoint.h"
    00015 #include "yapf/yapf.h"
    00016 #include "newgrf_engine.h"
    00017 #include "newgrf_station.h"
    00018 #include "newgrf_commons.h"
    00019 #include "train.h"
    00020 #include "variables.h"
    00021 #include "autoslope.h"
    00022 #include "water.h"
    00023 #include "tunnelbridge_map.h"
    00024 #include "window_func.h"
    00025 #include "vehicle_func.h"
    00026 #include "sound_func.h"
    00027 #include "tunnelbridge.h"
    00028 #include "station_map.h"
    00029 #include "functions.h"
    00030 #include "elrail_func.h"
    00031
    00032 #include "table/strings.h"
    00033 #include "table/railtypes.h"
    00034 #include "table/track_land.h"
    00035
    00036 RailtypeInfo _railtypes[RAILTYPE_END];
    00037
    00038 assert_compile(sizeof(_original_railtypes) <= sizeof(_railtypes));
    00039
    00043 void ResetRailTypes()
    00044 {
    00045   memset(_railtypes, 0, sizeof(_railtypes));
    00046   memcpy(_railtypes, _original_railtypes, sizeof(_original_railtypes));
    00047 }
    00048
    00049 const byte _track_sloped_sprites[14] = {
    00050   14, 15, 22, 13,
    00051    0, 21, 17, 12,
    00052   23,  0, 18, 20,
    00053   19, 16
    00054 };
    00055
    00056
    00057 /*         4
    00058  *     ---------
    00059  *    |\       /|
    00060  *    | \    1/ |
    00061  *    |  \   /  |
    00062  *    |   \ /   |
    00063  *  16|    \    |32
    00064  *    |   / \2  |
    00065  *    |  /   \  |
    00066  *    | /     \ |
    00067  *    |/       \|
    00068  *     ---------
    00069  *         8
    00070  */
    00071
    00072
    00073
    00074 /* MAP2 byte:    abcd???? => Signal On? Same coding as map3lo
    00075  * MAP3LO byte:  abcd???? => Signal Exists?
    00076  *               a and b are for diagonals, upper and left,
    00077  *               one for each direction. (ie a == NE->SW, b ==
    00078  *               SW->NE, or v.v., I don't know. b and c are
    00079  *               similar for lower and right.
    00080  * MAP2 byte:    ????abcd => Type of ground.
    00081  * MAP3LO byte:  ????abcd => Type of rail.
    00082  * MAP5:         00abcdef => rail
    00083  *               01abcdef => rail w/ signals
    00084  *               10uuuuuu => unused
    00085  *               11uuuudd => rail depot
    00086  */
    00087
    00088
    00089 Vehicle *EnsureNoTrainOnTrackProc(Vehicle *v, void *data)
    00090 {
    00091   TrackBits rail_bits = *(TrackBits *)data;
    00092
    00093   if (v->type != VEH_TRAIN) return NULL;
    00094
    00095   if ((v->u.rail.track != rail_bits) && !TracksOverlap(v->u.rail.track | rail_bits)) return NULL;
    00096
    00097   _error_message = VehicleInTheWayErrMsg(v);
    00098   return v;
    00099 }
    00100
    00108 static bool EnsureNoTrainOnTrack(TileIndex tile, Track track)
    00109 {
    00110   TrackBits rail_bits = TrackToTrackBits(track);
    00111
    00112   return !HasVehicleOnPos(tile, &rail_bits, &EnsureNoTrainOnTrackProc);
    00113 }
    00114
    00115 static bool CheckTrackCombination(TileIndex tile, TrackBits to_build, uint flags)
    00116 {
    00117   TrackBits current; // The current track layout
    00118   TrackBits future;  // The track layout we want to build
    00119   _error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;
    00120
    00121   if (!IsPlainRailTile(tile)) return false;
    00122
    00123   /* So, we have a tile with tracks on it (and possibly signals). Let's see
    00124    * what tracks first */
    00125   current = GetTrackBits(tile);
    00126   future = current | to_build;
    00127
    00128   /* Are we really building something new? */
    00129   if (current == future) {
    00130     /* Nothing new is being built */
    00131     _error_message = STR_1007_ALREADY_BUILT;
    00132     return false;
    00133   }
    00134
    00135   /* Let's see if we may build this */
    00136   if (flags & DC_NO_RAIL_OVERLAP || HasSignals(tile)) {
    00137     /* If we are not allowed to overlap (flag is on for ai companies or we have
    00138      * signals on the tile), check that */
    00139     return future == TRACK_BIT_HORZ || future == TRACK_BIT_VERT;
    00140   } else {
    00141     /* Normally, we may overlap and any combination is valid */
    00142     return true;
    00143   }
    00144 }
    00145
    00146
    00148 static const TrackBits _valid_tracks_without_foundation[15] = {
    00149   TRACK_BIT_ALL,
    00150   TRACK_BIT_RIGHT,
    00151   TRACK_BIT_UPPER,
    00152   TRACK_BIT_X,
    00153
    00154   TRACK_BIT_LEFT,
    00155   TRACK_BIT_NONE,
    00156   TRACK_BIT_Y,
    00157   TRACK_BIT_LOWER,
    00158
    00159   TRACK_BIT_LOWER,
    00160   TRACK_BIT_Y,
    00161   TRACK_BIT_NONE,
    00162   TRACK_BIT_LEFT,
    00163
    00164   TRACK_BIT_X,
    00165   TRACK_BIT_UPPER,
    00166   TRACK_BIT_RIGHT,
    00167 };
    00168
    00170 static const TrackBits _valid_tracks_on_leveled_foundation[15] = {
    00171   TRACK_BIT_NONE,
    00172   TRACK_BIT_LEFT,
    00173   TRACK_BIT_LOWER,
    00174   TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,
    00175
    00176   TRACK_BIT_RIGHT,
    00177   TRACK_BIT_ALL,
    00178   TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,
    00179   TRACK_BIT_ALL,
    00180
    00181   TRACK_BIT_UPPER,
    00182   TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,
    00183   TRACK_BIT_ALL,
    00184   TRACK_BIT_ALL,
    00185
    00186   TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,
    00187   TRACK_BIT_ALL,
    00188   TRACK_BIT_ALL
    00189 };
    00190
    00198 Foundation GetRailFoundation(Slope tileh, TrackBits bits)
    00199 {
    00200   if (bits == TRACK_BIT_NONE) return FOUNDATION_NONE;
    00201
    00202   if (IsSteepSlope(tileh)) {
    00203     /* Test for inclined foundations */
    00204     if (bits == TRACK_BIT_X) return FOUNDATION_INCLINED_X;
    00205     if (bits == TRACK_BIT_Y) return FOUNDATION_INCLINED_Y;
    00206
    00207     /* Get higher track */
    00208     Corner highest_corner = GetHighestSlopeCorner(tileh);
    00209     TrackBits higher_track = CornerToTrackBits(highest_corner);
    00210
    00211     /* Only higher track? */
    00212     if (bits == higher_track) return HalftileFoundation(highest_corner);
    00213
    00214     /* Overlap with higher track? */
    00215     if (TracksOverlap(bits | higher_track)) return FOUNDATION_INVALID;
    00216
    00217     /* either lower track or both higher and lower track */
    00218     return ((bits & higher_track) != 0 ? FOUNDATION_STEEP_BOTH : FOUNDATION_STEEP_LOWER);
    00219   } else {
    00220     if ((~_valid_tracks_without_foundation[tileh] & bits) == 0) return FOUNDATION_NONE;
    00221
    00222     bool valid_on_leveled = ((~_valid_tracks_on_leveled_foundation[tileh] & bits) == 0);
    00223
    00224     Corner track_corner;
    00225     switch (bits) {
    00226       case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
    00227       case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
    00228       case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
    00229       case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
    00230
    00231       case TRACK_BIT_HORZ:
    00232         if (tileh == SLOPE_N) return HalftileFoundation(CORNER_N);
    00233         if (tileh == SLOPE_S) return HalftileFoundation(CORNER_S);
    00234         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00235
    00236       case TRACK_BIT_VERT:
    00237         if (tileh == SLOPE_W) return HalftileFoundation(CORNER_W);
    00238         if (tileh == SLOPE_E) return HalftileFoundation(CORNER_E);
    00239         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00240
    00241       case TRACK_BIT_X:
    00242         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_X;
    00243         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00244
    00245       case TRACK_BIT_Y:
    00246         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_Y;
    00247         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00248
    00249       default:
    00250         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00251     }
    00252     /* Single diagonal track */
    00253
    00254     /* Track must be at least valid on leveled foundation */
    00255     if (!valid_on_leveled) return FOUNDATION_INVALID;
    00256
    00257     /* If slope has three raised corners, build leveled foundation */
    00258     if (IsSlopeWithThreeCornersRaised(tileh)) return FOUNDATION_LEVELED;
    00259
    00260     /* If neighboured corners of track_corner are lowered, build halftile foundation */
    00261     if ((tileh & SlopeWithThreeCornersRaised(OppositeCorner(track_corner))) == SlopeWithOneCornerRaised(track_corner)) return HalftileFoundation(track_corner);
    00262
    00263     /* else special anti-zig-zag foundation */
    00264     return SpecialRailFoundation(track_corner);
    00265   }
    00266 }
    00267
    00268
    00278 static CommandCost CheckRailSlope(Slope tileh, TrackBits rail_bits, TrackBits existing, TileIndex tile)
    00279 {
    00280   /* don't allow building on the lower side of a coast */
    00281   if (IsTileType(tile, MP_WATER) || (IsTileType(tile, MP_RAILWAY) && (GetRailGroundType(tile) == RAIL_GROUND_WATER))) {
    00282     if (!IsSteepSlope(tileh) && ((~_valid_tracks_on_leveled_foundation[tileh] & (rail_bits | existing)) != 0)) return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);
    00283   }
    00284
    00285   Foundation f_new = GetRailFoundation(tileh, rail_bits | existing);
    00286
    00287   /* check track/slope combination */
    00288   if ((f_new == FOUNDATION_INVALID) ||
    00289       ((f_new != FOUNDATION_NONE) && (!_settings_game.construction.build_on_slopes))) {
    00290     return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00291   }
    00292
    00293   Foundation f_old = GetRailFoundation(tileh, existing);
    00294   return CommandCost(EXPENSES_CONSTRUCTION, f_new != f_old ? _price.terraform : (Money)0);
    00295 }
    00296
    00297 /* Validate functions for rail building */
    00298 static inline bool ValParamTrackOrientation(Track track) {return IsValidTrack(track);}
    00299
    00306 CommandCost CmdBuildSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00307 {
    00308   Slope tileh;
    00309   RailType railtype = (RailType)p1;
    00310   Track track = (Track)p2;
    00311   TrackBits trackbit;
    00312   CommandCost cost(EXPENSES_CONSTRUCTION);
    00313   CommandCost ret;
    00314
    00315   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
    00316
    00317   tileh = GetTileSlope(tile, NULL);
    00318   trackbit = TrackToTrackBits(track);
    00319
    00320   switch (GetTileType(tile)) {
    00321     case MP_RAILWAY:
    00322       if (!CheckTileOwnership(tile)) return CMD_ERROR;
    00323
    00324       if (!IsCompatibleRail(GetRailType(tile), railtype)) return_cmd_error(STR_1001_IMPOSSIBLE_TRACK_COMBINATION);
    00325
    00326       if (!CheckTrackCombination(tile, trackbit, flags) ||
    00327           !EnsureNoTrainOnTrack(tile, track)) {
    00328         return CMD_ERROR;
    00329       }
    00330
    00331       ret = CheckRailSlope(tileh, trackbit, GetTrackBits(tile), tile);
    00332       if (CmdFailed(ret)) return ret;
    00333       cost.AddCost(ret);
    00334
    00335       /* If the rail types don't match, try to convert only if engines of
    00336        * the new rail type are not powered on the present rail type and engines of
    00337        * the present rail type are powered on the new rail type. */
    00338       if (GetRailType(tile) != railtype && !HasPowerOnRail(railtype, GetRailType(tile))) {
    00339         if (HasPowerOnRail(GetRailType(tile), railtype)) {
    00340           ret = DoCommand(tile, tile, railtype, flags, CMD_CONVERT_RAIL);
    00341           if (CmdFailed(ret)) return ret;
    00342           cost.AddCost(ret);
    00343         } else {
    00344           return CMD_ERROR;
    00345         }
    00346       }
    00347
    00348       if (flags & DC_EXEC) {
    00349         SetRailGroundType(tile, RAIL_GROUND_BARREN);
    00350         SetTrackBits(tile, GetTrackBits(tile) | trackbit);
    00351       }
    00352       break;
    00353
    00354     case MP_ROAD:
    00355 #define M(x) (1 << (x))
    00356       /* Level crossings may only be built on these slopes */
    00357       if (!HasBit(M(SLOPE_SEN) | M(SLOPE_ENW) | M(SLOPE_NWS) | M(SLOPE_NS) | M(SLOPE_WSE) | M(SLOPE_EW) | M(SLOPE_FLAT), tileh)) {
    00358         return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00359       }
    00360 #undef M
    00361
    00362       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00363
    00364       if (IsNormalRoad(tile)) {
    00365         if (HasRoadWorks(tile)) return_cmd_error(STR_ROAD_WORKS_IN_PROGRESS);
    00366
    00367         if (GetDisallowedRoadDirections(tile) != DRD_NONE) return_cmd_error(STR_ERR_CROSSING_ON_ONEWAY_ROAD);
    00368
    00369         RoadTypes roadtypes = GetRoadTypes(tile);
    00370         RoadBits road = GetRoadBits(tile, ROADTYPE_ROAD);
    00371         RoadBits tram = GetRoadBits(tile, ROADTYPE_TRAM);
    00372         switch (roadtypes) {
    00373           default: break;
    00374           case ROADTYPES_TRAM:
    00375             /* Tram crossings must always have road. */
    00376             if (flags & DC_EXEC) SetRoadOwner(tile, ROADTYPE_ROAD, _current_company);
    00377             roadtypes |= ROADTYPES_ROAD;
    00378             break;
    00379
    00380           case ROADTYPES_ALL:
    00381             if (road != tram) return CMD_ERROR;
    00382             break;
    00383         }
    00384
    00385         road |= tram;
    00386
    00387         if ((track == TRACK_X && road == ROAD_Y) ||
    00388             (track == TRACK_Y && road == ROAD_X)) {
    00389           if (flags & DC_EXEC) {
    00390             MakeRoadCrossing(tile, GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), _current_company, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, roadtypes, GetTownIndex(tile));
    00391             UpdateLevelCrossing(tile, false);
    00392           }
    00393           break;
    00394         }
    00395       }
    00396
    00397       if (IsLevelCrossing(tile) && GetCrossingRailBits(tile) == trackbit) {
    00398         return_cmd_error(STR_1007_ALREADY_BUILT);
    00399       }
    00400       /* FALLTHROUGH */
    00401
    00402     default:
    00403       /* Will there be flat water on the lower halftile? */
    00404       bool water_ground = IsTileType(tile, MP_WATER) && IsSlopeWithOneCornerRaised(tileh);
    00405
    00406       ret = CheckRailSlope(tileh, trackbit, TRACK_BIT_NONE, tile);
    00407       if (CmdFailed(ret)) return ret;
    00408       cost.AddCost(ret);
    00409
    00410       ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00411       if (CmdFailed(ret)) return ret;
    00412       cost.AddCost(ret);
    00413
    00414       if (water_ground) {
    00415         cost.AddCost(-_price.clear_water);
    00416         cost.AddCost(_price.clear_roughland);
    00417       }
    00418
    00419       if (flags & DC_EXEC) {
    00420         MakeRailNormal(tile, _current_company, trackbit, railtype);
    00421         if (water_ground) SetRailGroundType(tile, RAIL_GROUND_WATER);
    00422       }
    00423       break;
    00424   }
    00425
    00426   if (flags & DC_EXEC) {
    00427     MarkTileDirtyByTile(tile);
    00428     AddTrackToSignalBuffer(tile, track, _current_company);
    00429     YapfNotifyTrackLayoutChange(tile, track);
    00430   }
    00431
    00432   return cost.AddCost(RailBuildCost(railtype));
    00433 }
    00434
    00441 CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00442 {
    00443   Track track = (Track)p2;
    00444   TrackBits trackbit;
    00445   CommandCost cost(EXPENSES_CONSTRUCTION, _price.remove_rail );
    00446   bool crossing = false;
    00447
    00448   if (!ValParamTrackOrientation((Track)p2)) return CMD_ERROR;
    00449   trackbit = TrackToTrackBits(track);
    00450
    00451   /* Need to read tile owner now because it may change when the rail is removed
    00452    * Also, in case of floods, _current_company != owner
    00453    * There may be invalid tiletype even in exec run (when removing long track),
    00454    * so do not call GetTileOwner(tile) in any case here */
    00455   Owner owner = INVALID_OWNER;
    00456
    00457   Vehicle *v = NULL;
    00458
    00459   switch (GetTileType(tile)) {
    00460     case MP_ROAD: {
    00461       if (!IsLevelCrossing(tile) ||
    00462           GetCrossingRailBits(tile) != trackbit ||
    00463           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
    00464           (!(flags & DC_BANKRUPT) && !EnsureNoVehicleOnGround(tile))) {
    00465         return CMD_ERROR;
    00466       }
    00467
    00468       if (flags & DC_EXEC) {
    00469         if (HasReservedTracks(tile, trackbit)) {
    00470           v = GetTrainForReservation(tile, track);
    00471           if (v != NULL) FreeTrainTrackReservation(v);
    00472         }
    00473         owner = GetTileOwner(tile);
    00474         MakeRoadNormal(tile, GetCrossingRoadBits(tile), GetRoadTypes(tile), GetTownIndex(tile), GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM));
    00475       }
    00476       break;
    00477     }
    00478
    00479     case MP_RAILWAY: {
    00480       TrackBits present;
    00481
    00482       if (!IsPlainRailTile(tile) ||
    00483           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
    00484           !EnsureNoTrainOnTrack(tile, track)) {
    00485         return CMD_ERROR;
    00486       }
    00487
    00488       present = GetTrackBits(tile);
    00489       if ((present & trackbit) == 0) return CMD_ERROR;
    00490       if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
    00491
    00492       /* Charge extra to remove signals on the track, if they are there */
    00493       if (HasSignalOnTrack(tile, track))
    00494         cost.AddCost(DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS));
    00495
    00496       if (flags & DC_EXEC) {
    00497         if (HasReservedTracks(tile, trackbit)) {
    00498           v = GetTrainForReservation(tile, track);
    00499           if (v != NULL) FreeTrainTrackReservation(v);
    00500         }
    00501         owner = GetTileOwner(tile);
    00502         present ^= trackbit;
    00503         if (present == 0) {
    00504           Slope tileh = GetTileSlope(tile, NULL);
    00505           /* If there is flat water on the lower halftile, convert the tile to shore so the water remains */
    00506           if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh)) {
    00507             MakeShore(tile);
    00508           } else {
    00509             DoClearSquare(tile);
    00510           }
    00511         } else {
    00512           SetTrackBits(tile, present);
    00513           SetTrackReservation(tile, GetTrackReservation(tile) & present);
    00514         }
    00515       }
    00516       break;
    00517     }
    00518
    00519     default: return CMD_ERROR;
    00520   }
    00521
    00522   if (flags & DC_EXEC) {
    00523     /* if we got that far, 'owner' variable is set correctly */
    00524     assert(IsValidCompanyID(owner));
    00525
    00526     MarkTileDirtyByTile(tile);
    00527     if (crossing) {
    00528       /* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we
    00529        * are removing one of these pieces, we'll need to update signals for
    00530        * both directions explicitly, as after the track is removed it won't
    00531        * 'connect' with the other piece. */
    00532       AddTrackToSignalBuffer(tile, TRACK_X, owner);
    00533       AddTrackToSignalBuffer(tile, TRACK_Y, owner);
    00534       YapfNotifyTrackLayoutChange(tile, TRACK_X);
    00535       YapfNotifyTrackLayoutChange(tile, TRACK_Y);
    00536     } else {
    00537       AddTrackToSignalBuffer(tile, track, owner);
    00538       YapfNotifyTrackLayoutChange(tile, track);
    00539     }
    00540
    00541     if (v != NULL) TryPathReserve(v, true);
    00542   }
    00543
    00544   return cost;
    00545 }
    00546
    00547
    00555 bool FloodHalftile(TileIndex t)
    00556 {
    00557   bool flooded = false;
    00558   if (GetRailGroundType(t) == RAIL_GROUND_WATER) return flooded;
    00559
    00560   Slope tileh = GetTileSlope(t, NULL);
    00561   TrackBits rail_bits = GetTrackBits(t);
    00562
    00563   if (IsSlopeWithOneCornerRaised(tileh)) {
    00564     TrackBits lower_track = CornerToTrackBits(OppositeCorner(GetHighestSlopeCorner(tileh)));
    00565
    00566     TrackBits to_remove = lower_track & rail_bits;
    00567     if (to_remove != 0) {
    00568       _current_company = OWNER_WATER;
    00569       if (CmdFailed(DoCommand(t, 0, FIND_FIRST_BIT(to_remove), DC_EXEC, CMD_REMOVE_SINGLE_RAIL))) return flooded; // not yet floodable
    00570       flooded = true;
    00571       rail_bits = rail_bits & ~to_remove;
    00572       if (rail_bits == 0) {
    00573         MakeShore(t);
    00574         MarkTileDirtyByTile(t);
    00575         return flooded;
    00576       }
    00577     }
    00578
    00579     if (IsNonContinuousFoundation(GetRailFoundation(tileh, rail_bits))) {
    00580       flooded = true;
    00581       SetRailGroundType(t, RAIL_GROUND_WATER);
    00582       MarkTileDirtyByTile(t);
    00583     }
    00584   } else {
    00585     /* Make shore on steep slopes and 'three-corners-raised'-slopes. */
    00586     if (ApplyFoundationToSlope(GetRailFoundation(tileh, rail_bits), &tileh) == 0) {
    00587       if (IsSteepSlope(tileh) || IsSlopeWithThreeCornersRaised(tileh)) {
    00588         flooded = true;
    00589         SetRailGroundType(t, RAIL_GROUND_WATER);
    00590         MarkTileDirtyByTile(t);
    00591       }
    00592     }
    00593   }
    00594   return flooded;
    00595 }
    00596
    00597 static const TileIndexDiffC _trackdelta[] = {
    00598   { -1,  0 }, {  0,  1 }, { -1,  0 }, {  0,  1 }, {  1,  0 }, {  0,  1 },
    00599   {  0,  0 },
    00600   {  0,  0 },
    00601   {  1,  0 }, {  0, -1 }, {  0, -1 }, {  1,  0 }, {  0, -1 }, { -1,  0 },
    00602   {  0,  0 },
    00603   {  0,  0 }
    00604 };
    00605
    00606
    00607 static CommandCost ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)
    00608 {
    00609   int x = TileX(start);
    00610   int y = TileY(start);
    00611   int ex = TileX(end);
    00612   int ey = TileY(end);
    00613   int dx, dy, trdx, trdy;
    00614
    00615   if (!ValParamTrackOrientation(TrackdirToTrack(*trackdir))) return CMD_ERROR;
    00616
    00617   /* calculate delta x,y from start to end tile */
    00618   dx = ex - x;
    00619   dy = ey - y;
    00620
    00621   /* calculate delta x,y for the first direction */
    00622   trdx = _trackdelta[*trackdir].x;
    00623   trdy = _trackdelta[*trackdir].y;
    00624
    00625   if (!IsDiagonalTrackdir(*trackdir)) {
    00626     trdx += _trackdelta[*trackdir ^ 1].x;
    00627     trdy += _trackdelta[*trackdir ^ 1].y;
    00628   }
    00629
    00630   /* validate the direction */
    00631   while (
    00632     (trdx <= 0 && dx > 0) ||
    00633     (trdx >= 0 && dx < 0) ||
    00634     (trdy <= 0 && dy > 0) ||
    00635     (trdy >= 0 && dy < 0)
    00636   ) {
    00637     if (!HasBit(*trackdir, 3)) { // first direction is invalid, try the other
    00638       SetBit(*trackdir, 3); // reverse the direction
    00639       trdx = -trdx;
    00640       trdy = -trdy;
    00641     } else { // other direction is invalid too, invalid drag
    00642       return CMD_ERROR;
    00643     }
    00644   }
    00645
    00646   /* (for diagonal tracks, this is already made sure of by above test), but:
    00647    * for non-diagonal tracks, check if the start and end tile are on 1 line */
    00648   if (!IsDiagonalTrackdir(*trackdir)) {
    00649     trdx = _trackdelta[*trackdir].x;
    00650     trdy = _trackdelta[*trackdir].y;
    00651     if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx))
    00652       return CMD_ERROR;
    00653   }
    00654
    00655   return CommandCost();
    00656 }
    00657
    00667 static CommandCost CmdRailTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00668 {
    00669   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
    00670   Track track = (Track)GB(p2, 4, 3);
    00671   bool remove = HasBit(p2, 7);
    00672   RailType railtype = (RailType)GB(p2, 0, 4);
    00673
    00674   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
    00675   if (p1 >= MapSize()) return CMD_ERROR;
    00676   TileIndex end_tile = p1;
    00677   Trackdir trackdir = TrackToTrackdir(track);
    00678
    00679   if (CmdFailed(ValidateAutoDrag(&trackdir, tile, end_tile))) return CMD_ERROR;
    00680
    00681   if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, tile);
    00682
    00683   for (;;) {
    00684     ret = DoCommand(tile, railtype, TrackdirToTrack(trackdir), flags, remove ? CMD_REMOVE_SINGLE_RAIL : CMD_BUILD_SINGLE_RAIL);
    00685
    00686     if (CmdFailed(ret)) {
    00687       if (_error_message != STR_1007_ALREADY_BUILT && !remove) break;
    00688       _error_message = INVALID_STRING_ID;
    00689     } else {
    00690       total_cost.AddCost(ret);
    00691     }
    00692
    00693     if (tile == end_tile) break;
    00694
    00695     tile += ToTileIndexDiff(_trackdelta[trackdir]);
    00696
    00697     /* toggle railbit for the non-diagonal tracks */
    00698     if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
    00699   }
    00700
    00701   return (total_cost.GetCost() == 0) ? CommandCost(remove ? INVALID_STRING_ID : (_error_message == INVALID_STRING_ID ? STR_1007_ALREADY_BUILT : _error_message)) : total_cost;
    00702 }
    00703
    00715 CommandCost CmdBuildRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00716 {
    00717   return CmdRailTrackHelper(tile, flags, p1, ClrBit(p2, 7), text);
    00718 }
    00719
    00731 CommandCost CmdRemoveRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00732 {
    00733   return CmdRailTrackHelper(tile, flags, p1, SetBit(p2, 7), text);
    00734 }
    00735
    00745 CommandCost CmdBuildTrainDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00746 {
    00747   Slope tileh;
    00748
    00749   /* check railtype and valid direction for depot (0 through 3), 4 in total */
    00750   if (!ValParamRailtype((RailType)p1)) return CMD_ERROR;
    00751
    00752   tileh = GetTileSlope(tile, NULL);
    00753
    00754   DiagDirection dir = Extract<DiagDirection, 0>(p2);
    00755
    00756   /* Prohibit construction if
    00757    * The tile is non-flat AND
    00758    * 1) build-on-slopes is disabled
    00759    * 2) the tile is steep i.e. spans two height levels
    00760    * 3) the exit points in the wrong direction
    00761    */
    00762
    00763   if (tileh != SLOPE_FLAT && (
    00764         !_settings_game.construction.build_on_slopes ||
    00765         IsSteepSlope(tileh) ||
    00766         !CanBuildDepotByTileh(dir, tileh)
    00767       )) {
    00768     return_cmd_error(STR_0007_FLAT_LAND_REQUIRED);
    00769   }
    00770
    00771   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00772   if (CmdFailed(cost)) return CMD_ERROR;
    00773
    00774   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00775
    00776   if (!Depot::CanAllocateItem()) return CMD_ERROR;
    00777
    00778   if (flags & DC_EXEC) {
    00779     Depot *d = new Depot(tile);
    00780     MakeRailDepot(tile, _current_company, dir, (RailType)p1);
    00781     MarkTileDirtyByTile(tile);
    00782
    00783     d->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
    00784
    00785     AddSideToSignalBuffer(tile, INVALID_DIAGDIR, _current_company);
    00786     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
    00787   }
    00788
    00789   return cost.AddCost(_price.build_train_depot);
    00790 }
    00791
    00810 CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00811 {
    00812   Track track = (Track)GB(p1, 0, 3);
    00813   bool ctrl_pressed = HasBit(p1, 3); // was the CTRL button pressed
    00814   SignalVariant sigvar = (ctrl_pressed ^ HasBit(p1, 4)) ? SIG_SEMAPHORE : SIG_ELECTRIC; // the signal variant of the new signal
    00815   SignalType sigtype = (SignalType)GB(p1, 5, 3); // the signal type of the new signal
    00816   bool convert_signal = HasBit(p1, 8); // convert button pressed
    00817   SignalType cycle_start = (SignalType)GB(p1, 9, 3);
    00818   SignalType cycle_stop = (SignalType)GB(p1, 12, 3);
    00819   CommandCost cost;
    00820   uint num_dir_cycle = GB(p1, 15, 2);
    00821
    00822   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
    00823
    00824   if (!ValParamTrackOrientation(track) || !IsTileType(tile, MP_RAILWAY) || !EnsureNoTrainOnTrack(tile, track))
    00825     return CMD_ERROR;
    00826
    00827   /* Protect against invalid signal copying */
    00828   if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
    00829
    00830   /* You can only build signals on plain rail tiles, and the selected track must exist */
    00831   if (!IsPlainRailTile(tile) || !HasTrack(tile, track)) return CMD_ERROR;
    00832
    00833   if (!CheckTileOwnership(tile)) return CMD_ERROR;
    00834
    00835   {
    00836     /* See if this is a valid track combination for signals, (ie, no overlap) */
    00837     TrackBits trackbits = GetTrackBits(tile);
    00838     if (KillFirstBit(trackbits) != TRACK_BIT_NONE && // More than one track present
    00839         trackbits != TRACK_BIT_HORZ &&
    00840         trackbits != TRACK_BIT_VERT) {
    00841       return_cmd_error(STR_1005_NO_SUITABLE_RAILROAD_TRACK);
    00842     }
    00843   }
    00844
    00845   /* In case we don't want to change an existing signal, return without error. */
    00846   if (HasBit(p1, 17) && HasSignalOnTrack(tile, track)) return CommandCost();
    00847
    00848   /* you can not convert a signal if no signal is on track */
    00849   if (convert_signal && !HasSignalOnTrack(tile, track)) return CMD_ERROR;
    00850
    00851   if (!HasSignalOnTrack(tile, track)) {
    00852     /* build new signals */
    00853     cost = CommandCost(EXPENSES_CONSTRUCTION, _price.build_signals);
    00854   } else {
    00855     if (p2 != 0 && sigvar != GetSignalVariant(tile, track)) {
    00856       /* convert signals <-> semaphores */
    00857       cost = CommandCost(EXPENSES_CONSTRUCTION, _price.build_signals + _price.remove_signals);
    00858
    00859     } else if (convert_signal) {
    00860       /* convert button pressed */
    00861       if (ctrl_pressed || GetSignalVariant(tile, track) != sigvar) {
    00862         /* convert electric <-> semaphore */
    00863         cost = CommandCost(EXPENSES_CONSTRUCTION, _price.build_signals + _price.remove_signals);
    00864       } else {
    00865         /* it is free to change signal type: normal-pre-exit-combo */
    00866         cost = CommandCost();
    00867       }
    00868
    00869     } else {
    00870       /* it is free to change orientation/pre-exit-combo signals */
    00871       cost = CommandCost();
    00872     }
    00873   }
    00874
    00875   if (flags & DC_EXEC) {
    00876     Vehicle *v = NULL;
    00877     /* The new/changed signal could block our path. As this can lead to
    00878      * stale reservations, we clear the path reservation here and try
    00879      * to redo it later on. */
    00880     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
    00881       v = GetTrainForReservation(tile, track);
    00882       if (v != NULL) FreeTrainTrackReservation(v);
    00883     }
    00884
    00885     if (!HasSignals(tile)) {
    00886       /* there are no signals at all on this tile yet */
    00887       SetHasSignals(tile, true);
    00888       SetSignalStates(tile, 0xF); // all signals are on
    00889       SetPresentSignals(tile, 0); // no signals built by default
    00890       SetSignalType(tile, track, sigtype);
    00891       SetSignalVariant(tile, track, sigvar);
    00892     }
    00893
    00894     if (p2 == 0) {
    00895       if (!HasSignalOnTrack(tile, track)) {
    00896         /* build new signals */
    00897         SetPresentSignals(tile, GetPresentSignals(tile) | (IsPbsSignal(sigtype) ? KillFirstBit(SignalOnTrack(track)) : SignalOnTrack(track)));
    00898         SetSignalType(tile, track, sigtype);
    00899         SetSignalVariant(tile, track, sigvar);
    00900         while (num_dir_cycle-- > 0) CycleSignalSide(tile, track);
    00901       } else {
    00902         if (convert_signal) {
    00903           /* convert signal button pressed */
    00904           if (ctrl_pressed) {
    00905             /* toggle the pressent signal variant: SIG_ELECTRIC <-> SIG_SEMAPHORE */
    00906             SetSignalVariant(tile, track, (GetSignalVariant(tile, track) == SIG_ELECTRIC) ? SIG_SEMAPHORE : SIG_ELECTRIC);
    00907             /* Query current signal type so the check for PBS signals below works. */
    00908             sigtype = GetSignalType(tile, track);
    00909           } else {
    00910             /* convert the present signal to the chosen type and variant */
    00911             SetSignalType(tile, track, sigtype);
    00912             SetSignalVariant(tile, track, sigvar);
    00913             if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
    00914               SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
    00915             }
    00916           }
    00917
    00918         } else if (ctrl_pressed) {
    00919           /* cycle between cycle_start and cycle_end */
    00920           sigtype = (SignalType)(GetSignalType(tile, track) + 1);
    00921
    00922           if (sigtype < cycle_start || sigtype > cycle_stop) sigtype = cycle_start;
    00923
    00924           SetSignalType(tile, track, sigtype);
    00925           if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
    00926             SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
    00927           }
    00928         } else {
    00929           /* cycle the signal side: both -> left -> right -> both -> ... */
    00930           CycleSignalSide(tile, track);
    00931           /* Query current signal type so the check for PBS signals below works. */
    00932           sigtype = GetSignalType(tile, track);
    00933         }
    00934       }
    00935     } else {
    00936       /* If CmdBuildManySignals is called with copying signals, just copy the
    00937        * direction of the first signal given as parameter by CmdBuildManySignals */
    00938       SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | (p2 & SignalOnTrack(track)));
    00939       SetSignalVariant(tile, track, sigvar);
    00940       SetSignalType(tile, track, sigtype);
    00941     }
    00942
    00943     if (IsPbsSignal(sigtype)) {
    00944       /* PBS signals should show red unless they are on a reservation. */
    00945       uint mask = GetPresentSignals(tile) & SignalOnTrack(track);
    00946       SetSignalStates(tile, (GetSignalStates(tile) & ~mask) | ((HasBit(GetTrackReservation(tile), track) ? UINT_MAX : 0) & mask));
    00947     }
    00948     MarkTileDirtyByTile(tile);
    00949     AddTrackToSignalBuffer(tile, track, _current_company);
    00950     YapfNotifyTrackLayoutChange(tile, track);
    00951     if (v != NULL) TryPathReserve(v, true);
    00952   }
    00953
    00954   return cost;
    00955 }
    00956
    00957 static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
    00958 {
    00959   tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
    00960   if (tile == INVALID_TILE) return false;
    00961
    00962   /* Check for track bits on the new tile */
    00963   TrackdirBits trackdirbits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
    00964
    00965   if (TracksOverlap(TrackdirBitsToTrackBits(trackdirbits))) return false;
    00966   trackdirbits &= TrackdirReachesTrackdirs(trackdir);
    00967
    00968   /* No track bits, must stop */
    00969   if (trackdirbits == TRACKDIR_BIT_NONE) return false;
    00970
    00971   /* Get the first track dir */
    00972   trackdir = RemoveFirstTrackdir(&trackdirbits);
    00973
    00974   /* Any left? It's a junction so we stop */
    00975   if (trackdirbits != TRACKDIR_BIT_NONE) return false;
    00976
    00977   switch (GetTileType(tile)) {
    00978     case MP_RAILWAY:
    00979       if (IsRailDepot(tile)) return false;
    00980       if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
    00981       signal_ctr++;
    00982       if (IsDiagonalTrackdir(trackdir)) {
    00983         signal_ctr++;
    00984         /* Ensure signal_ctr even so X and Y pieces get signals */
    00985         ClrBit(signal_ctr, 0);
    00986       }
    00987       return true;
    00988
    00989     case MP_ROAD:
    00990       if (!IsLevelCrossing(tile)) return false;
    00991       signal_ctr += 2;
    00992       return true;
    00993
    00994     case MP_TUNNELBRIDGE: {
    00995       TileIndex orig_tile = tile; // backup old value
    00996
    00997       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
    00998       if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
    00999
    01000       /* Skip to end of tunnel or bridge
    01001        * note that tile is a parameter by reference, so it must be updated */
    01002       tile = GetOtherTunnelBridgeEnd(tile);
    01003
    01004       signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
    01005       return true;
    01006     }
    01007
    01008     default: return false;
    01009   }
    01010 }
    01011
    01025 static CommandCost CmdSignalTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01026 {
    01027   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
    01028   int signal_ctr;
    01029   byte signals;
    01030   bool error = true;
    01031   TileIndex end_tile;
    01032   TileIndex start_tile = tile;
    01033
    01034   Track track = (Track)GB(p2, 0, 3);
    01035   bool mode = HasBit(p2, 3);
    01036   bool semaphores = HasBit(p2, 4);
    01037   bool remove = HasBit(p2, 5);
    01038   bool autofill = HasBit(p2, 6);
    01039   Trackdir trackdir = TrackToTrackdir(track);
    01040   byte signal_density = GB(p2, 24, 8);
    01041
    01042   if (p1 >= MapSize()) return CMD_ERROR;
    01043   end_tile = p1;
    01044   if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
    01045
    01046   if (!IsTileType(tile, MP_RAILWAY)) return CMD_ERROR;
    01047
    01048   /* for vertical/horizontal tracks, double the given signals density
    01049    * since the original amount will be too dense (shorter tracks) */
    01050   signal_density *= 2;
    01051
    01052   if (CmdFailed(ValidateAutoDrag(&trackdir, tile, end_tile))) return CMD_ERROR;
    01053
    01054   track = TrackdirToTrack(trackdir); // trackdir might have changed, keep track in sync
    01055   Trackdir start_trackdir = trackdir;
    01056
    01057   /* Must start on a valid track to be able to avoid loops */
    01058   if (!HasTrack(tile, track)) return CMD_ERROR;
    01059
    01060   SignalType sigtype = (SignalType)GB(p2, 7, 3);
    01061   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
    01062
    01063   /* copy the signal-style of the first rail-piece if existing */
    01064   if (HasSignalOnTrack(tile, track)) {
    01065     signals = GetPresentSignals(tile) & SignalOnTrack(track);
    01066     assert(signals != 0);
    01067
    01068     /* copy signal/semaphores style (independent of CTRL) */
    01069     semaphores = GetSignalVariant(tile, track) != SIG_ELECTRIC;
    01070
    01071     sigtype = GetSignalType(tile, track);
    01072     /* Don't but copy pre-signal type */
    01073     if (sigtype < SIGTYPE_PBS) sigtype = SIGTYPE_NORMAL;
    01074   } else { // no signals exist, drag a two-way signal stretch
    01075     signals = IsPbsSignal(sigtype) ? SignalAlongTrackdir(trackdir) : SignalOnTrack(track);
    01076   }
    01077
    01078   byte signal_dir = 0;
    01079   if (signals & SignalAlongTrackdir(trackdir))   SetBit(signal_dir, 0);
    01080   if (signals & SignalAgainstTrackdir(trackdir)) SetBit(signal_dir, 1);
    01081
    01082   /* signal_ctr         - amount of tiles already processed
    01083    * signals_density    - setting to put signal on every Nth tile (double space on |, -- tracks)
    01084    **********
    01085    * trackdir   - trackdir to build with autorail
    01086    * semaphores - semaphores or signals
    01087    * signals    - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
    01088    *              and convert all others to semaphore/signal
    01089    * remove     - 1 remove signals, 0 build signals */
    01090   signal_ctr = 0;
    01091   for (;;) {
    01092     /* only build/remove signals with the specified density */
    01093     if ((remove && autofill) || signal_ctr % signal_density == 0) {
    01094       uint32 p1 = GB(TrackdirToTrack(trackdir), 0, 3);
    01095       SB(p1, 3, 1, mode);
    01096       SB(p1, 4, 1, semaphores);
    01097       SB(p1, 5, 3, sigtype);
    01098       if (!remove && signal_ctr == 0) SetBit(p1, 17);
    01099
    01100       /* Pick the correct orientation for the track direction */
    01101       signals = 0;
    01102       if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
    01103       if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
    01104
    01105       ret = DoCommand(tile, p1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
    01106
    01107       /* Be user-friendly and try placing signals as much as possible */
    01108       if (CmdSucceeded(ret)) {
    01109         error = false;
    01110         total_cost.AddCost(ret);
    01111       }
    01112     }
    01113
    01114     if (autofill) {
    01115       if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
    01116
    01117       /* Prevent possible loops */
    01118       if (tile == start_tile && trackdir == start_trackdir) break;
    01119     } else {
    01120       if (tile == end_tile) break;
    01121
    01122       tile += ToTileIndexDiff(_trackdelta[trackdir]);
    01123       signal_ctr++;
    01124
    01125       /* toggle railbit for the non-diagonal tracks (|, -- tracks) */
    01126       if (IsDiagonalTrackdir(trackdir)) {
    01127         signal_ctr++;
    01128       } else {
    01129         ToggleBit(trackdir, 0);
    01130       }
    01131     }
    01132   }
    01133
    01134   return error ? CMD_ERROR : total_cost;
    01135 }
    01136
    01152 CommandCost CmdBuildSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01153 {
    01154   return CmdSignalTrackHelper(tile, flags, p1, p2,text);
    01155 }
    01156
    01166 CommandCost CmdRemoveSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01167 {
    01168   Track track = (Track)GB(p1, 0, 3);
    01169
    01170   if (!ValParamTrackOrientation(track) ||
    01171       !IsTileType(tile, MP_RAILWAY) ||
    01172       !HasTrack(tile, track) ||
    01173       !EnsureNoTrainOnTrack(tile, track) ||
    01174       !HasSignalOnTrack(tile, track)) {
    01175     return CMD_ERROR;
    01176   }
    01177
    01178   /* Only water can remove signals from anyone */
    01179   if (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) return CMD_ERROR;
    01180
    01181   /* Do it? */
    01182   if (flags & DC_EXEC) {
    01183     Vehicle *v = NULL;
    01184     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
    01185       v = GetTrainForReservation(tile, track);
    01186     }
    01187     SetPresentSignals(tile, GetPresentSignals(tile) & ~SignalOnTrack(track));
    01188
    01189     /* removed last signal from tile? */
    01190     if (GetPresentSignals(tile) == 0) {
    01191       SetSignalStates(tile, 0);
    01192       SetHasSignals(tile, false);
    01193       SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
    01194     }
    01195
    01196     AddTrackToSignalBuffer(tile, track, GetTileOwner(tile));
    01197     YapfNotifyTrackLayoutChange(tile, track);
    01198     if (v != NULL) TryPathReserve(v, false);
    01199
    01200     MarkTileDirtyByTile(tile);
    01201   }
    01202
    01203   return CommandCost(EXPENSES_CONSTRUCTION, _price.remove_signals);
    01204 }
    01205
    01221 CommandCost CmdRemoveSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01222 {
    01223   return CmdSignalTrackHelper(tile, flags, p1, SetBit(p2, 5), text); // bit 5 is remove bit
    01224 }
    01225
    01227 Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
    01228 {
    01229   /* Similiar checks as in TrainPowerChanged() */
    01230
    01231   if (v->type == VEH_TRAIN && !IsArticulatedPart(v)) {
    01232     const RailVehicleInfo *rvi = RailVehInfo(v->engine_type);
    01233     if (GetVehicleProperty(v, 0x0B, rvi->power) != 0) TrainPowerChanged(v->First());
    01234   }
    01235
    01236   return NULL;
    01237 }
    01238
    01246 CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01247 {
    01248   CommandCost cost(EXPENSES_CONSTRUCTION);
    01249   RailType totype = (RailType)p2;
    01250
    01251   if (!ValParamRailtype(totype)) return CMD_ERROR;
    01252   if (p1 >= MapSize()) return CMD_ERROR;
    01253
    01254   uint ex = TileX(tile);
    01255   uint ey = TileY(tile);
    01256   uint sx = TileX(p1);
    01257   uint sy = TileY(p1);
    01258
    01259   /* make sure sx,sy are smaller than ex,ey */
    01260   if (ex < sx) Swap(ex, sx);
    01261   if (ey < sy) Swap(ey, sy);
    01262
    01263   _error_message = STR_1005_NO_SUITABLE_RAILROAD_TRACK; // by default, there is no track to convert
    01264
    01265   for (uint x = sx; x <= ex; ++x) {
    01266     for (uint y = sy; y <= ey; ++y) {
    01267       TileIndex tile = TileXY(x, y);
    01268       TileType tt = GetTileType(tile);
    01269
    01270       /* Check if there is any track on tile */
    01271       switch (tt) {
    01272         case MP_RAILWAY:
    01273           break;
    01274         case MP_STATION:
    01275           if (!IsRailwayStation(tile)) continue;
    01276           break;
    01277         case MP_ROAD:
    01278           if (!IsLevelCrossing(tile)) continue;
    01279           break;
    01280         case MP_TUNNELBRIDGE:
    01281           if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
    01282           break;
    01283         default: continue;
    01284       }
    01285
    01286       /* Original railtype we are converting from */
    01287       RailType type = GetRailType(tile);
    01288
    01289       /* Converting to the same type or converting 'hidden' elrail -> rail */
    01290       if (type == totype || (_settings_game.vehicle.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
    01291
    01292       /* Trying to convert other's rail */
    01293       if (!CheckTileOwnership(tile)) continue;
    01294
    01295       SmallVector<Vehicle*, 2> vehicles_affected;
    01296
    01297       /* Vehicle on the tile when not converting Rail <-> ElRail
    01298        * Tunnels and bridges have special check later */
    01299       if (tt != MP_TUNNELBRIDGE) {
    01300         if (!IsCompatibleRail(type, totype) && !EnsureNoVehicleOnGround(tile)) continue;
    01301         if (flags & DC_EXEC) { // we can safely convert, too
    01302           TrackBits reserved = GetReservedTrackbits(tile);
    01303           Track     track;
    01304           while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
    01305             Vehicle *v = GetTrainForReservation(tile, track);
    01306             if (v != NULL && !HasPowerOnRail(v->u.rail.railtype, totype)) {
    01307               /* No power on new rail type, reroute. */
    01308               FreeTrainTrackReservation(v);
    01309               *vehicles_affected.Append() = v;
    01310             }
    01311           }
    01312
    01313           SetRailType(tile, totype);
    01314           MarkTileDirtyByTile(tile);
    01315           /* update power of train engines on this tile */
    01316           FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
    01317         }
    01318       }
    01319
    01320       switch (tt) {
    01321         case MP_RAILWAY:
    01322           switch (GetRailTileType(tile)) {
    01323             case RAIL_TILE_WAYPOINT:
    01324               if (flags & DC_EXEC) {
    01325                 /* notify YAPF about the track layout change */
    01326                 YapfNotifyTrackLayoutChange(tile, GetRailWaypointTrack(tile));
    01327               }
    01328               cost.AddCost(RailConvertCost(type, totype));
    01329               break;
    01330
    01331             case RAIL_TILE_DEPOT:
    01332               if (flags & DC_EXEC) {
    01333                 /* notify YAPF about the track layout change */
    01334                 YapfNotifyTrackLayoutChange(tile, GetRailDepotTrack(tile));
    01335
    01336                 /* Update build vehicle window related to this depot */
    01337                 InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
    01338                 InvalidateWindowData(WC_BUILD_VEHICLE, tile);
    01339               }
    01340               cost.AddCost(RailConvertCost(type, totype));
    01341               break;
    01342
    01343             default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
    01344               if (flags & DC_EXEC) {
    01345                 /* notify YAPF about the track layout change */
    01346                 TrackBits tracks = GetTrackBits(tile);
    01347                 while (tracks != TRACK_BIT_NONE) {
    01348                   YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
    01349                 }
    01350               }
    01351               cost.AddCost(RailConvertCost(type, totype) * CountBits(GetTrackBits(tile)));
    01352               break;
    01353           }
    01354           break;
    01355
    01356         case MP_TUNNELBRIDGE: {
    01357           TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
    01358
    01359           /* If both ends of tunnel/bridge are in the range, do not try to convert twice -
    01360            * it would cause assert because of different test and exec runs */
    01361           if (endtile < tile && TileX(endtile) >= sx && TileX(endtile) <= ex &&
    01362               TileY(endtile) >= sy && TileY(endtile) <= ey) continue;
    01363
    01364           /* When not coverting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
    01365           if (!IsCompatibleRail(GetRailType(tile), totype) &&
    01366               HasVehicleOnTunnelBridge(tile, endtile)) continue;
    01367
    01368           if (flags & DC_EXEC) {
    01369             Track track = DiagDirToDiagTrack(GetTunnelBridgeDirection(tile));
    01370             if (GetTunnelBridgeReservation(tile)) {
    01371               Vehicle *v = GetTrainForReservation(tile, track);
    01372               if (v != NULL && !HasPowerOnRail(v->u.rail.railtype, totype)) {
    01373                 /* No power on new rail type, reroute. */
    01374                 FreeTrainTrackReservation(v);
    01375                 *vehicles_affected.Append() = v;
    01376               }
    01377             }
    01378             SetRailType(tile, totype);
    01379             SetRailType(endtile, totype);
    01380
    01381             FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
    01382             FindVehicleOnPos(endtile, NULL, &UpdateTrainPowerProc);
    01383
    01384             YapfNotifyTrackLayoutChange(tile, track);
    01385             YapfNotifyTrackLayoutChange(endtile, track);
    01386
    01387             MarkTileDirtyByTile(tile);
    01388             MarkTileDirtyByTile(endtile);
    01389
    01390             if (IsBridge(tile)) {
    01391               TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
    01392               TileIndex t = tile + delta;
    01393               for (; t != endtile; t += delta) MarkTileDirtyByTile(t); // TODO encapsulate this into a function
    01394             }
    01395           }
    01396
    01397           cost.AddCost((GetTunnelBridgeLength(tile, endtile) + 2) * RailConvertCost(type, totype));
    01398         } break;
    01399
    01400         default: // MP_STATION, MP_ROAD
    01401           if (flags & DC_EXEC) {
    01402             Track track = ((tt == MP_STATION) ? GetRailStationTrack(tile) : GetCrossingRailTrack(tile));
    01403             YapfNotifyTrackLayoutChange(tile, track);
    01404           }
    01405
    01406           cost.AddCost(RailConvertCost(type, totype));
    01407           break;
    01408       }
    01409
    01410       for (uint i = 0; i < vehicles_affected.Length(); ++i) {
    01411         TryPathReserve(vehicles_affected[i], true);
    01412       }
    01413     }
    01414   }
    01415
    01416   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
    01417 }
    01418
    01419 static CommandCost RemoveTrainDepot(TileIndex tile, DoCommandFlag flags)
    01420 {
    01421   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER)
    01422     return CMD_ERROR;
    01423
    01424   if (!EnsureNoVehicleOnGround(tile))
    01425     return CMD_ERROR;
    01426
    01427   if (flags & DC_EXEC) {
    01428     /* read variables before the depot is removed */
    01429     DiagDirection dir = GetRailDepotDirection(tile);
    01430     Owner owner = GetTileOwner(tile);
    01431     Vehicle *v = NULL;
    01432
    01433     if (GetDepotWaypointReservation(tile)) {
    01434       v = GetTrainForReservation(tile, DiagDirToDiagTrack(dir));
    01435       if (v != NULL) FreeTrainTrackReservation(v);
    01436     }
    01437
    01438     DoClearSquare(tile);
    01439     delete GetDepotByTile(tile);
    01440     AddSideToSignalBuffer(tile, dir, owner);
    01441     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
    01442     if (v != NULL) TryPathReserve(v, true);
    01443   }
    01444
    01445   return CommandCost(EXPENSES_CONSTRUCTION, _price.remove_train_depot);
    01446 }
    01447
    01448 static CommandCost ClearTile_Track(TileIndex tile, DoCommandFlag flags)
    01449 {
    01450   CommandCost cost(EXPENSES_CONSTRUCTION);
    01451   CommandCost ret;
    01452
    01453   if (flags & DC_AUTO) {
    01454     if (!IsTileOwner(tile, _current_company))
    01455       return_cmd_error(STR_1024_AREA_IS_OWNED_BY_ANOTHER);
    01456
    01457     if (IsPlainRailTile(tile)) {
    01458       return_cmd_error(STR_1008_MUST_REMOVE_RAILROAD_TRACK);
    01459     } else {
    01460       return_cmd_error(STR_2004_BUILDING_MUST_BE_DEMOLISHED);
    01461     }
    01462   }
    01463
    01464   switch (GetRailTileType(tile)) {
    01465     case RAIL_TILE_SIGNALS:
    01466     case RAIL_TILE_NORMAL: {
    01467       Slope tileh = GetTileSlope(tile, NULL);
    01468       /* Is there flat water on the lower halftile, that gets cleared expensively? */
    01469       bool water_ground = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh));
    01470
    01471       TrackBits tracks = GetTrackBits(tile);
    01472       while (tracks != TRACK_BIT_NONE) {
    01473         Track track = RemoveFirstTrack(&tracks);
    01474         ret = DoCommand(tile, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
    01475         if (CmdFailed(ret)) return CMD_ERROR;
    01476         cost.AddCost(ret);
    01477       }
    01478
    01479       /* when bankrupting, don't make water dirty, there could be a ship on lower halftile */
    01480       if (water_ground && !(flags & DC_BANKRUPT)) {
    01481         if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    01482
    01483         /* The track was removed, and left a coast tile. Now also clear the water. */
    01484         if (flags & DC_EXEC) DoClearSquare(tile);
    01485         cost.AddCost(_price.clear_water);
    01486       }
    01487
    01488       return cost;
    01489     }
    01490
    01491     case RAIL_TILE_DEPOT:
    01492       return RemoveTrainDepot(tile, flags);
    01493
    01494     case RAIL_TILE_WAYPOINT:
    01495       return RemoveTrainWaypoint(tile, flags, false);
    01496
    01497     default:
    01498       return CMD_ERROR;
    01499   }
    01500 }
    01501
    01506 static uint GetSaveSlopeZ(uint x, uint y, Track track)
    01507 {
    01508   switch (track) {
    01509     case TRACK_UPPER: x &= ~0xF; y &= ~0xF; break;
    01510     case TRACK_LOWER: x |=  0xF; y |=  0xF; break;
    01511     case TRACK_LEFT:  x |=  0xF; y &= ~0xF; break;
    01512     case TRACK_RIGHT: x &= ~0xF; y |=  0xF; break;
    01513     default: break;
    01514   }
    01515   return GetSlopeZ(x, y);
    01516 }
    01517
    01518 static void DrawSingleSignal(TileIndex tile, Track track, byte condition, uint image, uint pos)
    01519 {
    01520   bool side = (_settings_game.vehicle.road_side != 0) && _settings_game.construction.signal_side;
    01521   static const Point SignalPositions[2][12] = {
    01522     { // Signals on the left side
    01523     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01524       { 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
    01525     /*  LOWER     LOWER     X         X         Y         Y     */
    01526       {11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
    01527     }, { // Signals on the right side
    01528     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01529       {14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
    01530     /*  LOWER     LOWER     X         X         Y         Y     */
    01531       {14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
    01532     }
    01533   };
    01534
    01535   uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
    01536   uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
    01537
    01538   SpriteID sprite;
    01539
    01540   SignalType type       = GetSignalType(tile, track);
    01541   SignalVariant variant = GetSignalVariant(tile, track);
    01542
    01543   if (type == SIGTYPE_NORMAL && variant == SIG_ELECTRIC) {
    01544     /* Normal electric signals are picked from original sprites. */
    01545     sprite = SPR_ORIGINAL_SIGNALS_BASE + image + condition;
    01546   } else {
    01547     /* All other signals are picked from add on sprites. */
    01548     sprite = SPR_SIGNALS_BASE + (type - 1) * 16 + variant * 64 + image + condition + (type > SIGTYPE_LAST_NOPBS ? 64 : 0);
    01549   }
    01550
    01551   AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, GetSaveSlopeZ(x, y, track));
    01552 }
    01553
    01554 static uint32 _drawtile_track_palette;
    01555
    01556
    01557 static void DrawTrackFence_NW(const TileInfo *ti, SpriteID base_image)
    01558 {
    01559   RailFenceOffset rfo = RFO_FLAT_X;
    01560   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
    01561   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01562     ti->x, ti->y + 1, 16, 1, 4, ti->z);
    01563 }
    01564
    01565 static void DrawTrackFence_SE(const TileInfo *ti, SpriteID base_image)
    01566 {
    01567   RailFenceOffset rfo = RFO_FLAT_X;
    01568   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
    01569   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01570     ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
    01571 }
    01572
    01573 static void DrawTrackFence_NW_SE(const TileInfo *ti, SpriteID base_image)
    01574 {
    01575   DrawTrackFence_NW(ti, base_image);
    01576   DrawTrackFence_SE(ti, base_image);
    01577 }
    01578
    01579 static void DrawTrackFence_NE(const TileInfo *ti, SpriteID base_image)
    01580 {
    01581   RailFenceOffset rfo = RFO_FLAT_Y;
    01582   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
    01583   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01584     ti->x + 1, ti->y, 1, 16, 4, ti->z);
    01585 }
    01586
    01587 static void DrawTrackFence_SW(const TileInfo *ti, SpriteID base_image)
    01588 {
    01589   RailFenceOffset rfo = RFO_FLAT_Y;
    01590   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
    01591   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01592     ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
    01593 }
    01594
    01595 static void DrawTrackFence_NE_SW(const TileInfo *ti, SpriteID base_image)
    01596 {
    01597   DrawTrackFence_NE(ti, base_image);
    01598   DrawTrackFence_SW(ti, base_image);
    01599 }
    01600
    01604 static void DrawTrackFence_NS_1(const TileInfo *ti, SpriteID base_image)
    01605 {
    01606   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_W);
    01607   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
    01608     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01609 }
    01610
    01614 static void DrawTrackFence_NS_2(const TileInfo *ti, SpriteID base_image)
    01615 {
    01616   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_E);
    01617   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
    01618     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01619 }
    01620
    01624 static void DrawTrackFence_WE_1(const TileInfo *ti, SpriteID base_image)
    01625 {
    01626   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_N);
    01627   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
    01628     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01629 }
    01630
    01634 static void DrawTrackFence_WE_2(const TileInfo *ti, SpriteID base_image)
    01635 {
    01636   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_S);
    01637   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
    01638     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01639 }
    01640
    01641
    01642 static void DrawTrackDetails(const TileInfo *ti)
    01643 {
    01644   /* Base sprite for track fences. */
    01645   SpriteID base_image = SPR_TRACK_FENCE_FLAT_X;
    01646
    01647   switch (GetRailGroundType(ti->tile)) {
    01648     case RAIL_GROUND_FENCE_NW:     DrawTrackFence_NW(ti, base_image);    break;
    01649     case RAIL_GROUND_FENCE_SE:     DrawTrackFence_SE(ti, base_image);    break;
    01650     case RAIL_GROUND_FENCE_SENW:   DrawTrackFence_NW_SE(ti, base_image); break;
    01651     case RAIL_GROUND_FENCE_NE:     DrawTrackFence_NE(ti, base_image);    break;
    01652     case RAIL_GROUND_FENCE_SW:     DrawTrackFence_SW(ti, base_image);    break;
    01653     case RAIL_GROUND_FENCE_NESW:   DrawTrackFence_NE_SW(ti, base_image); break;
    01654     case RAIL_GROUND_FENCE_VERT1:  DrawTrackFence_NS_1(ti, base_image);  break;
    01655     case RAIL_GROUND_FENCE_VERT2:  DrawTrackFence_NS_2(ti, base_image);  break;
    01656     case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti, base_image);  break;
    01657     case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti, base_image);  break;
    01658     case RAIL_GROUND_WATER: {
    01659       Corner track_corner;
    01660       if (IsHalftileSlope(ti->tileh)) {
    01661         /* Steep slope or one-corner-raised slope with halftile foundation */
    01662         track_corner = GetHalftileSlopeCorner(ti->tileh);
    01663       } else {
    01664         /* Three-corner-raised slope */
    01665         track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    01666       }
    01667       switch (track_corner) {
    01668         case CORNER_W: DrawTrackFence_NS_1(ti, base_image); break;
    01669         case CORNER_S: DrawTrackFence_WE_2(ti, base_image); break;
    01670         case CORNER_E: DrawTrackFence_NS_2(ti, base_image); break;
    01671         case CORNER_N: DrawTrackFence_WE_1(ti, base_image); break;
    01672         default: NOT_REACHED();
    01673       }
    01674       break;
    01675     }
    01676     default: break;
    01677   }
    01678 }
    01679
    01680
    01686 static void DrawTrackBits(TileInfo *ti, TrackBits track)
    01687 {
    01688   /* SubSprite for drawing the track halftile of 'three-corners-raised'-sloped rail sprites. */
    01689   static const int INF = 1000; // big number compared to tilesprite size
    01690   static const SubSprite _halftile_sub_sprite[4] = {
    01691     { -INF    , -INF  , 32 - 33, INF     }, // CORNER_W, clip 33 pixels from right
    01692     { -INF    ,  0 + 7, INF    , INF     }, // CORNER_S, clip 7 pixels from top
    01693     { -31 + 33, -INF  , INF    , INF     }, // CORNER_E, clip 33 pixels from left
    01694     { -INF    , -INF  , INF    , 30 - 23 }  // CORNER_N, clip 23 pixels from bottom
    01695   };
    01696
    01697   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    01698   RailGroundType rgt = GetRailGroundType(ti->tile);
    01699   Foundation f = GetRailFoundation(ti->tileh, track);
    01700   Corner halftile_corner = CORNER_INVALID;
    01701
    01702   if (IsNonContinuousFoundation(f)) {
    01703     /* Save halftile corner */
    01704     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
    01705     /* Draw lower part first */
    01706     track &= ~CornerToTrackBits(halftile_corner);
    01707     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
    01708   }
    01709
    01710   DrawFoundation(ti, f);
    01711   /* DrawFoundation modifies ti */
    01712
    01713   SpriteID image;
    01714   SpriteID pal = PAL_NONE;
    01715   const SubSprite *sub = NULL;
    01716   bool junction = false;
    01717
    01718   /* Select the sprite to use. */
    01719   if (track == 0) {
    01720     /* Clear ground (only track on halftile foundation) */
    01721     if (rgt == RAIL_GROUND_WATER) {
    01722       if (IsSteepSlope(ti->tileh)) {
    01723         DrawShoreTile(ti->tileh);
    01724         image = 0;
    01725       } else {
    01726         image = SPR_FLAT_WATER_TILE;
    01727       }
    01728     } else {
    01729       switch (rgt) {
    01730         case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01731         case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOWY_TILE; break;
    01732         default:                     image = SPR_FLAT_GRASS_TILE; break;
    01733       }
    01734       image += _tileh_to_sprite[ti->tileh];
    01735     }
    01736   } else {
    01737     if (ti->tileh != SLOPE_FLAT) {
    01738       /* track on non-flat ground */
    01739       image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
    01740     } else {
    01741       /* track on flat ground */
    01742       (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
    01743       (image++,                           track == TRACK_BIT_X) ||
    01744       (image++,                           track == TRACK_BIT_UPPER) ||
    01745       (image++,                           track == TRACK_BIT_LOWER) ||
    01746       (image++,                           track == TRACK_BIT_RIGHT) ||
    01747       (image++,                           track == TRACK_BIT_LEFT) ||
    01748       (image++,                           track == TRACK_BIT_CROSS) ||
    01749
    01750       (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
    01751       (image++,                            track == TRACK_BIT_VERT) ||
    01752
    01753       (junction = true, false) ||
    01754       (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
    01755       (image++,                          (track & TRACK_BIT_3WAY_SW) == 0) ||
    01756       (image++,                          (track & TRACK_BIT_3WAY_NW) == 0) ||
    01757       (image++,                          (track & TRACK_BIT_3WAY_SE) == 0) ||
    01758       (image++, true);
    01759     }
    01760
    01761     switch (rgt) {
    01762       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    01763       case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset;  break;
    01764       case RAIL_GROUND_WATER: {
    01765         /* three-corner-raised slope */
    01766         DrawShoreTile(ti->tileh);
    01767         Corner track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    01768         sub = &(_halftile_sub_sprite[track_corner]);
    01769         break;
    01770       }
    01771       default: break;
    01772     }
    01773   }
    01774
    01775   if (image != 0) DrawGroundSprite(image, pal, sub);
    01776
    01777   /* Draw track pieces individually for junction tiles */
    01778   if (junction) {
    01779     if (track & TRACK_BIT_X)     DrawGroundSprite(rti->base_sprites.single_y, PAL_NONE);
    01780     if (track & TRACK_BIT_Y)     DrawGroundSprite(rti->base_sprites.single_x, PAL_NONE);
    01781     if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PAL_NONE);
    01782     if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PAL_NONE);
    01783     if (track & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PAL_NONE);
    01784     if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PAL_NONE);
    01785   }
    01786
    01787   /* PBS debugging, draw reserved tracks darker */
    01788   if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation) {
    01789     TrackBits pbs = GetTrackReservation(ti->tile);
    01790     if (pbs & TRACK_BIT_X) {
    01791       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
    01792         DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH);
    01793       } else {
    01794         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
    01795       }
    01796     }
    01797     if (pbs & TRACK_BIT_Y) {
    01798       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
    01799         DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH);
    01800       } else {
    01801         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
    01802       }
    01803     }
    01804     if (pbs & TRACK_BIT_UPPER) AddSortableSpriteToDraw(rti->base_sprites.single_n, PALETTE_CRASH, ti->x, ti->y, 16, 16, 0, ti->z + (ti->tileh & SLOPE_N ? 8 : 0));
    01805     if (pbs & TRACK_BIT_LOWER) AddSortableSpriteToDraw(rti->base_sprites.single_s, PALETTE_CRASH, ti->x, ti->y, 16, 16, 0, ti->z + (ti->tileh & SLOPE_S ? 8 : 0));
    01806     if (pbs & TRACK_BIT_LEFT)  AddSortableSpriteToDraw(rti->base_sprites.single_w, PALETTE_CRASH, ti->x, ti->y, 16, 16, 0, ti->z + (ti->tileh & SLOPE_W ? 8 : 0));
    01807     if (pbs & TRACK_BIT_RIGHT) AddSortableSpriteToDraw(rti->base_sprites.single_e, PALETTE_CRASH, ti->x, ti->y, 16, 16, 0, ti->z + (ti->tileh & SLOPE_E ? 8 : 0));
    01808   }
    01809
    01810   if (IsValidCorner(halftile_corner)) {
    01811     DrawFoundation(ti, HalftileFoundation(halftile_corner));
    01812
    01813     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
    01814     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    01815     image = _track_sloped_sprites[fake_slope - 1] + rti->base_sprites.track_y;
    01816     pal = PAL_NONE;
    01817     switch (rgt) {
    01818       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    01819       case RAIL_GROUND_ICE_DESERT:
    01820       case RAIL_GROUND_HALF_SNOW:  image += rti->snow_offset;  break; // higher part has snow in this case too
    01821       default: break;
    01822     }
    01823     DrawGroundSprite(image, pal, &(_halftile_sub_sprite[halftile_corner]));
    01824
    01825     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && IsSteepSlope(ti->tileh) && HasReservedTracks(ti->tile, CornerToTrackBits(halftile_corner))) {
    01826       static const byte _corner_to_track_sprite[] = {3, 1, 2, 0};
    01827       AddSortableSpriteToDraw(_corner_to_track_sprite[halftile_corner] + rti->base_sprites.single_n, PALETTE_CRASH, ti->x, ti->y, 16, 16, 0, ti->z + 16);
    01828     }
    01829   }
    01830 }
    01831
    01837 enum {
    01838   SIGNAL_TO_SOUTHWEST =  0,
    01839   SIGNAL_TO_NORTHEAST =  2,
    01840   SIGNAL_TO_SOUTHEAST =  4,
    01841   SIGNAL_TO_NORTHWEST =  6,
    01842   SIGNAL_TO_EAST      =  8,
    01843   SIGNAL_TO_WEST      = 10,
    01844   SIGNAL_TO_SOUTH     = 12,
    01845   SIGNAL_TO_NORTH     = 14,
    01846 };
    01847
    01848 static void DrawSignals(TileIndex tile, TrackBits rails)
    01849 {
    01850 #define MAYBE_DRAW_SIGNAL(x,y,z,t) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, t, GetSingleSignalState(tile, x), y, z)
    01851
    01852   if (!(rails & TRACK_BIT_Y)) {
    01853     if (!(rails & TRACK_BIT_X)) {
    01854       if (rails & TRACK_BIT_LEFT) {
    01855         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTH, 0, TRACK_LEFT);
    01856         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTH, 1, TRACK_LEFT);
    01857       }
    01858       if (rails & TRACK_BIT_RIGHT) {
    01859         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_NORTH, 2, TRACK_RIGHT);
    01860         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_SOUTH, 3, TRACK_RIGHT);
    01861       }
    01862       if (rails & TRACK_BIT_UPPER) {
    01863         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_WEST, 4, TRACK_UPPER);
    01864         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_EAST, 5, TRACK_UPPER);
    01865       }
    01866       if (rails & TRACK_BIT_LOWER) {
    01867         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_WEST, 6, TRACK_LOWER);
    01868         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_EAST, 7, TRACK_LOWER);
    01869       }
    01870     } else {
    01871       MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHWEST, 8, TRACK_X);
    01872       MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHEAST, 9, TRACK_X);
    01873     }
    01874   } else {
    01875     MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHEAST, 10, TRACK_Y);
    01876     MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHWEST, 11, TRACK_Y);
    01877   }
    01878 }
    01879
    01880 static void DrawTile_Track(TileInfo *ti)
    01881 {
    01882   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    01883   SpriteID image;
    01884
    01885   _drawtile_track_palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
    01886
    01887   if (IsPlainRailTile(ti->tile)) {
    01888     TrackBits rails = GetTrackBits(ti->tile);
    01889
    01890     DrawTrackBits(ti, rails);
    01891
    01892     if (HasBit(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti);
    01893
    01894     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    01895
    01896     if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
    01897   } else {
    01898     /* draw depot/waypoint */
    01899     const DrawTileSprites *dts;
    01900     const DrawTileSeqStruct *dtss;
    01901     uint32 relocation;
    01902     SpriteID pal = PAL_NONE;
    01903
    01904     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
    01905
    01906     if (IsRailDepot(ti->tile)) {
    01907       if (IsInvisibilitySet(TO_BUILDINGS)) {
    01908         /* Draw rail instead of depot */
    01909         dts = &_depot_invisible_gfx_table[GetRailDepotDirection(ti->tile)];
    01910       } else {
    01911         dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
    01912       }
    01913
    01914       relocation = rti->total_offset;
    01915
    01916       image = dts->ground.sprite;
    01917       if (image != SPR_FLAT_GRASS_TILE) image += rti->total_offset;
    01918
    01919       /* adjust ground tile for desert
    01920        * don't adjust for snow, because snow in depots looks weird */
    01921       if (IsSnowRailGround(ti->tile) && _settings_game.game_creation.landscape == LT_TROPIC) {
    01922         if (image != SPR_FLAT_GRASS_TILE) {
    01923           image += rti->snow_offset; // tile with tracks
    01924         } else {
    01925           image = SPR_FLAT_SNOWY_TILE; // flat ground
    01926         }
    01927       }
    01928     } else {
    01929       /* look for customization */
    01930       byte stat_id = GetWaypointByTile(ti->tile)->stat_id;
    01931       const StationSpec *statspec = GetCustomStationSpec(STAT_CLASS_WAYP, stat_id);
    01932
    01933       if (statspec != NULL) {
    01934         /* emulate station tile - open with building */
    01935         const Station *st = ComposeWaypointStation(ti->tile);
    01936         uint gfx = 2;
    01937
    01938         if (HasBit(statspec->callbackmask, CBM_STATION_SPRITE_LAYOUT)) {
    01939           uint16 callback = GetStationCallback(CBID_STATION_SPRITE_LAYOUT, 0, 0, statspec, st, ti->tile);
    01940           if (callback != CALLBACK_FAILED) gfx = callback;
    01941         }
    01942
    01943         if (statspec->renderdata == NULL) {
    01944           dts = GetStationTileLayout(STATION_RAIL, gfx);
    01945         } else {
    01946           dts = &statspec->renderdata[(gfx < statspec->tiles ? gfx : 0) + GetWaypointAxis(ti->tile)];
    01947         }
    01948
    01949         if (dts != NULL && dts->seq != NULL) {
    01950           relocation = GetCustomStationRelocation(statspec, st, ti->tile);
    01951
    01952           image = dts->ground.sprite;
    01953           if (HasBit(image, SPRITE_MODIFIER_USE_OFFSET)) {
    01954             image += GetCustomStationGroundRelocation(statspec, st, ti->tile);
    01955             image += rti->custom_ground_offset;
    01956           } else {
    01957             image += rti->total_offset;
    01958           }
    01959
    01960           pal = dts->ground.pal;
    01961         } else {
    01962           goto default_waypoint;
    01963         }
    01964       } else {
    01965 default_waypoint:
    01966         /* There is no custom layout, fall back to the default graphics */
    01967         dts = &_waypoint_gfx_table[GetWaypointAxis(ti->tile)];
    01968         relocation = 0;
    01969         image = dts->ground.sprite + rti->total_offset;
    01970         if (IsSnowRailGround(ti->tile)) image += rti->snow_offset;
    01971       }
    01972     }
    01973
    01974     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, _drawtile_track_palette));
    01975
    01976     /* PBS debugging, draw reserved tracks darker */
    01977     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && GetDepotWaypointReservation(ti->tile) &&
    01978         (!IsRailDepot(ti->tile) || GetRailDepotDirection(ti->tile) == DIAGDIR_SW || GetRailDepotDirection(ti->tile) == DIAGDIR_SE)) {
    01979       DrawGroundSprite(GetWaypointAxis(ti->tile) == AXIS_X ? rti->base_sprites.single_y : rti->base_sprites.single_x, PALETTE_CRASH);
    01980     }
    01981
    01982     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    01983
    01984     foreach_draw_tile_seq(dtss, dts->seq) {
    01985       SpriteID image = dtss->image.sprite;
    01986       SpriteID pal   = dtss->image.pal;
    01987
    01988       /* Stop drawing sprite sequence once we meet a sprite that doesn't have to be opaque */
    01989       if (IsInvisibilitySet(TO_BUILDINGS) && !HasBit(image, SPRITE_MODIFIER_OPAQUE)) return;
    01990
    01991       /* Unlike stations, our default waypoint has no variation for
    01992        * different railtype, so don't use the railtype offset if
    01993        * no relocation is set */
    01994       if (HasBit(image, SPRITE_MODIFIER_USE_OFFSET)) {
    01995         image += rti->total_offset;
    01996       } else {
    01997         image += relocation;
    01998       }
    01999
    02000       pal = SpriteLayoutPaletteTransform(image, pal, _drawtile_track_palette);
    02001
    02002       if ((byte)dtss->delta_z != 0x80) {
    02003         AddSortableSpriteToDraw(
    02004           image, pal,
    02005           ti->x + dtss->delta_x, ti->y + dtss->delta_y,
    02006           dtss->size_x, dtss->size_y,
    02007           dtss->size_z, ti->z + dtss->delta_z,
    02008           !HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(TO_BUILDINGS)
    02009         );
    02010       } else {
    02011         /* For stations and original spritelayouts delta_x and delta_y are signed */
    02012         AddChildSpriteScreen(image, pal, dtss->delta_x, dtss->delta_y, !HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(TO_BUILDINGS));
    02013       }
    02014     }
    02015   }
    02016   DrawBridgeMiddle(ti);
    02017 }
    02018
    02019
    02020 static void DrawTileSequence(int x, int y, SpriteID ground, const DrawTileSeqStruct *dtss, uint32 offset)
    02021 {
    02022   SpriteID palette = COMPANY_SPRITE_COLOUR(_local_company);
    02023
    02024   DrawSprite(ground, PAL_NONE, x, y);
    02025   for (; dtss->image.sprite != 0; dtss++) {
    02026     Point pt = RemapCoords(dtss->delta_x, dtss->delta_y, dtss->delta_z);
    02027     SpriteID image = dtss->image.sprite + offset;
    02028
    02029     DrawSprite(image, HasBit(image, PALETTE_MODIFIER_COLOUR) ? palette : PAL_NONE, x + pt.x, y + pt.y);
    02030   }
    02031 }
    02032
    02033 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
    02034 {
    02035   const DrawTileSprites *dts = &_depot_gfx_table[dir];
    02036   SpriteID image = dts->ground.sprite;
    02037   uint32 offset = GetRailTypeInfo(railtype)->total_offset;
    02038
    02039   if (image != SPR_FLAT_GRASS_TILE) image += offset;
    02040   DrawTileSequence(x + 33, y + 17, image, dts->seq, offset);
    02041 }
    02042
    02043 void DrawDefaultWaypointSprite(int x, int y, RailType railtype)
    02044 {
    02045   uint32 offset = GetRailTypeInfo(railtype)->total_offset;
    02046   const DrawTileSprites *dts = &_waypoint_gfx_table[AXIS_X];
    02047
    02048   DrawTileSequence(x, y, dts->ground.sprite + offset, dts->seq, 0);
    02049 }
    02050
    02051 static uint GetSlopeZ_Track(TileIndex tile, uint x, uint y)
    02052 {
    02053   uint z;
    02054   Slope tileh = GetTileSlope(tile, &z);
    02055
    02056   if (tileh == SLOPE_FLAT) return z;
    02057   if (IsPlainRailTile(tile)) {
    02058     z += ApplyFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
    02059     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
    02060   } else {
    02061     return z + TILE_HEIGHT;
    02062   }
    02063 }
    02064
    02065 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
    02066 {
    02067   return IsPlainRailTile(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
    02068 }
    02069
    02070 static void GetAcceptedCargo_Track(TileIndex tile, AcceptedCargo ac)
    02071 {
    02072   /* not used */
    02073 }
    02074
    02075 static void AnimateTile_Track(TileIndex tile)
    02076 {
    02077   /* not used */
    02078 }
    02079
    02080 static void TileLoop_Track(TileIndex tile)
    02081 {
    02082   RailGroundType old_ground = GetRailGroundType(tile);
    02083   RailGroundType new_ground;
    02084
    02085   if (old_ground == RAIL_GROUND_WATER) {
    02086     TileLoop_Water(tile);
    02087     return;
    02088   }
    02089
    02090   switch (_settings_game.game_creation.landscape) {
    02091     case LT_ARCTIC: {
    02092       uint z;
    02093       Slope slope = GetTileSlope(tile, &z);
    02094       bool half = false;
    02095
    02096       /* for non-flat track, use lower part of track
    02097        * in other cases, use the highest part with track */
    02098       if (IsPlainRailTile(tile)) {
    02099         TrackBits track = GetTrackBits(tile);
    02100         Foundation f = GetRailFoundation(slope, track);
    02101
    02102         switch (f) {
    02103           case FOUNDATION_NONE:
    02104             /* no foundation - is the track on the upper side of three corners raised tile? */
    02105             if (IsSlopeWithThreeCornersRaised(slope)) z += TILE_HEIGHT;
    02106             break;
    02107
    02108           case FOUNDATION_INCLINED_X:
    02109           case FOUNDATION_INCLINED_Y:
    02110             /* sloped track - is it on a steep slope? */
    02111             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    02112             break;
    02113
    02114           case FOUNDATION_STEEP_LOWER:
    02115             /* only lower part of steep slope */
    02116             z += TILE_HEIGHT;
    02117             break;
    02118
    02119           default:
    02120             /* if it is a steep slope, then there is a track on higher part */
    02121             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    02122             z += TILE_HEIGHT;
    02123             break;
    02124         }
    02125
    02126         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
    02127       } else {
    02128         /* is the depot on a non-flat tile? */
    02129         if (slope != SLOPE_FLAT) z += TILE_HEIGHT;
    02130       }
    02131
    02132       /* 'z' is now the lowest part of the highest track bit -
    02133        * for sloped track, it is 'z' of lower part
    02134        * for two track bits, it is 'z' of higher track bit
    02135        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
    02136       if (z > GetSnowLine()) {
    02137         if (half && z - GetSnowLine() == TILE_HEIGHT) {
    02138           /* track on non-continuous foundation, lower part is not under snow */
    02139           new_ground = RAIL_GROUND_HALF_SNOW;
    02140         } else {
    02141           new_ground = RAIL_GROUND_ICE_DESERT;
    02142         }
    02143         goto set_ground;
    02144       }
    02145       break;
    02146       }
    02147
    02148     case LT_TROPIC:
    02149       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
    02150         new_ground = RAIL_GROUND_ICE_DESERT;
    02151         goto set_ground;
    02152       }
    02153       break;
    02154   }
    02155
    02156   if (!IsPlainRailTile(tile)) return;
    02157
    02158   new_ground = RAIL_GROUND_GRASS;
    02159
    02160   if (old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
    02161     /* determine direction of fence */
    02162     TrackBits rail = GetTrackBits(tile);
    02163
    02164     switch (rail) {
    02165       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
    02166       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
    02167       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
    02168       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
    02169
    02170       default: {
    02171         Owner owner = GetTileOwner(tile);
    02172
    02173         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
    02174               (rail & TRACK_BIT_3WAY_NW) == 0 &&
    02175               (rail & TRACK_BIT_X)
    02176             )) {
    02177           TileIndex n = tile + TileDiffXY(0, -1);
    02178           TrackBits nrail = GetTrackBits(n);
    02179
    02180           if (!IsTileType(n, MP_RAILWAY) ||
    02181               !IsTileOwner(n, owner) ||
    02182               nrail == TRACK_BIT_UPPER ||
    02183               nrail == TRACK_BIT_LEFT) {
    02184             new_ground = RAIL_GROUND_FENCE_NW;
    02185           }
    02186         }
    02187
    02188         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
    02189               (rail & TRACK_BIT_3WAY_SE) == 0 &&
    02190               (rail & TRACK_BIT_X)
    02191             )) {
    02192           TileIndex n = tile + TileDiffXY(0, 1);
    02193           TrackBits nrail = GetTrackBits(n);
    02194
    02195           if (!IsTileType(n, MP_RAILWAY) ||
    02196               !IsTileOwner(n, owner) ||
    02197               nrail == TRACK_BIT_LOWER ||
    02198               nrail == TRACK_BIT_RIGHT) {
    02199             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
    02200               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
    02201           }
    02202         }
    02203
    02204         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
    02205               (rail & TRACK_BIT_3WAY_NE) == 0 &&
    02206               (rail & TRACK_BIT_Y)
    02207             )) {
    02208           TileIndex n = tile + TileDiffXY(-1, 0);
    02209           TrackBits nrail = GetTrackBits(n);
    02210
    02211           if (!IsTileType(n, MP_RAILWAY) ||
    02212               !IsTileOwner(n, owner) ||
    02213               nrail == TRACK_BIT_UPPER ||
    02214               nrail == TRACK_BIT_RIGHT) {
    02215             new_ground = RAIL_GROUND_FENCE_NE;
    02216           }
    02217         }
    02218
    02219         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
    02220               (rail & TRACK_BIT_3WAY_SW) == 0 &&
    02221               (rail & TRACK_BIT_Y)
    02222             )) {
    02223           TileIndex n = tile + TileDiffXY(1, 0);
    02224           TrackBits nrail = GetTrackBits(n);
    02225
    02226           if (!IsTileType(n, MP_RAILWAY) ||
    02227               !IsTileOwner(n, owner) ||
    02228               nrail == TRACK_BIT_LOWER ||
    02229               nrail == TRACK_BIT_LEFT) {
    02230             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
    02231               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
    02232           }
    02233         }
    02234         break;
    02235       }
    02236     }
    02237   }
    02238
    02239 set_ground:
    02240   if (old_ground != new_ground) {
    02241     SetRailGroundType(tile, new_ground);
    02242     MarkTileDirtyByTile(tile);
    02243   }
    02244 }
    02245
    02246
    02247 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
    02248 {
    02249   /* Case of half tile slope with water. */
    02250   if (mode == TRANSPORT_WATER && IsPlainRailTile(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
    02251     TrackBits tb = GetTrackBits(tile);
    02252     switch (tb) {
    02253       default: NOT_REACHED();
    02254       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
    02255       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
    02256       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
    02257       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
    02258     }
    02259     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
    02260   }
    02261
    02262   if (mode != TRANSPORT_RAIL) return 0;
    02263
    02264   TrackBits trackbits = TRACK_BIT_NONE;
    02265   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
    02266
    02267   switch (GetRailTileType(tile)) {
    02268     default: NOT_REACHED();
    02269     case RAIL_TILE_NORMAL:
    02270       trackbits = GetTrackBits(tile);
    02271       break;
    02272
    02273     case RAIL_TILE_SIGNALS: {
    02274       trackbits = GetTrackBits(tile);
    02275       byte a = GetPresentSignals(tile);
    02276       uint b = GetSignalStates(tile);
    02277
    02278       b &= a;
    02279
    02280       /* When signals are not present (in neither direction),
    02281        * we pretend them to be green. Otherwise, it depends on
    02282        * the signal type. For signals that are only active from
    02283        * one side, we set the missing signals explicitely to
    02284        * `green'. Otherwise, they implicitely become `red'. */
    02285       if (!IsOnewaySignal(tile, TRACK_UPPER) || (a & SignalOnTrack(TRACK_UPPER)) == 0) b |= ~a & SignalOnTrack(TRACK_UPPER);
    02286       if (!IsOnewaySignal(tile, TRACK_LOWER) || (a & SignalOnTrack(TRACK_LOWER)) == 0) b |= ~a & SignalOnTrack(TRACK_LOWER);
    02287
    02288       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
    02289       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
    02290       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
    02291       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
    02292
    02293       break;
    02294     }
    02295
    02296     case RAIL_TILE_DEPOT: {
    02297       DiagDirection dir = GetRailDepotDirection(tile);
    02298
    02299       if (side != INVALID_DIAGDIR && side != dir) break;
    02300
    02301       trackbits = DiagDirToDiagTrackBits(dir);
    02302       break;
    02303     }
    02304
    02305     case RAIL_TILE_WAYPOINT:
    02306       trackbits = GetRailWaypointBits(tile);
    02307       break;
    02308   }
    02309
    02310   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
    02311 }
    02312
    02313 static bool ClickTile_Track(TileIndex tile)
    02314 {
    02315   switch (GetRailTileType(tile)) {
    02316     case RAIL_TILE_DEPOT:    ShowDepotWindow(tile, VEH_TRAIN);            return true;
    02317     case RAIL_TILE_WAYPOINT: ShowWaypointWindow(GetWaypointByTile(tile)); return true;
    02318     default: return false;
    02319   }
    02320 }
    02321
    02322 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
    02323 {
    02324   td->owner[0] = GetTileOwner(tile);
    02325   switch (GetRailTileType(tile)) {
    02326     case RAIL_TILE_NORMAL:
    02327       td->str = STR_1021_RAILROAD_TRACK;
    02328       break;
    02329
    02330     case RAIL_TILE_SIGNALS: {
    02331       const StringID signal_type[6][6] = {
    02332         {
    02333           STR_RAILROAD_TRACK_WITH_NORMAL_SIGNALS,
    02334           STR_RAILROAD_TRACK_WITH_NORMAL_PRESIGNALS,
    02335           STR_RAILROAD_TRACK_WITH_NORMAL_EXITSIGNALS,
    02336           STR_RAILROAD_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02337           STR_RAILROAD_TRACK_WITH_NORMAL_PBSSIGNALS,
    02338           STR_RAILROAD_TRACK_WITH_NORMAL_NOENTRYSIGNALS
    02339         },
    02340         {
    02341           STR_RAILROAD_TRACK_WITH_NORMAL_PRESIGNALS,
    02342           STR_RAILROAD_TRACK_WITH_PRESIGNALS,
    02343           STR_RAILROAD_TRACK_WITH_PRE_EXITSIGNALS,
    02344           STR_RAILROAD_TRACK_WITH_PRE_COMBOSIGNALS,
    02345           STR_RAILROAD_TRACK_WITH_PRE_PBSSIGNALS,
    02346           STR_RAILROAD_TRACK_WITH_PRE_NOENTRYSIGNALS
    02347         },
    02348         {
    02349           STR_RAILROAD_TRACK_WITH_NORMAL_EXITSIGNALS,
    02350           STR_RAILROAD_TRACK_WITH_PRE_EXITSIGNALS,
    02351           STR_RAILROAD_TRACK_WITH_EXITSIGNALS,
    02352           STR_RAILROAD_TRACK_WITH_EXIT_COMBOSIGNALS,
    02353           STR_RAILROAD_TRACK_WITH_EXIT_PBSSIGNALS,
    02354           STR_RAILROAD_TRACK_WITH_EXIT_NOENTRYSIGNALS
    02355         },
    02356         {
    02357           STR_RAILROAD_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02358           STR_RAILROAD_TRACK_WITH_PRE_COMBOSIGNALS,
    02359           STR_RAILROAD_TRACK_WITH_EXIT_COMBOSIGNALS,
    02360           STR_RAILROAD_TRACK_WITH_COMBOSIGNALS,
    02361           STR_RAILROAD_TRACK_WITH_COMBO_PBSSIGNALS,
    02362           STR_RAILROAD_TRACK_WITH_COMBO_NOENTRYSIGNALS
    02363         },
    02364         {
    02365           STR_RAILROAD_TRACK_WITH_NORMAL_PBSSIGNALS,
    02366           STR_RAILROAD_TRACK_WITH_PRE_PBSSIGNALS,
    02367           STR_RAILROAD_TRACK_WITH_EXIT_PBSSIGNALS,
    02368           STR_RAILROAD_TRACK_WITH_COMBO_PBSSIGNALS,
    02369           STR_RAILROAD_TRACK_WITH_PBSSIGNALS,
    02370           STR_RAILROAD_TRACK_WITH_PBS_NOENTRYSIGNALS
    02371         },
    02372         {
    02373           STR_RAILROAD_TRACK_WITH_NORMAL_NOENTRYSIGNALS,
    02374           STR_RAILROAD_TRACK_WITH_PRE_NOENTRYSIGNALS,
    02375           STR_RAILROAD_TRACK_WITH_EXIT_NOENTRYSIGNALS,
    02376           STR_RAILROAD_TRACK_WITH_COMBO_NOENTRYSIGNALS,
    02377           STR_RAILROAD_TRACK_WITH_PBS_NOENTRYSIGNALS,
    02378           STR_RAILROAD_TRACK_WITH_NOENTRYSIGNALS
    02379         }
    02380       };
    02381
    02382       SignalType primary_signal;
    02383       SignalType secondary_signal;
    02384       if (HasSignalOnTrack(tile, TRACK_UPPER)) {
    02385         primary_signal = GetSignalType(tile, TRACK_UPPER);
    02386         secondary_signal = HasSignalOnTrack(tile, TRACK_LOWER) ? GetSignalType(tile, TRACK_LOWER) : primary_signal;
    02387       } else {
    02388         secondary_signal = primary_signal = GetSignalType(tile, TRACK_LOWER);
    02389       }
    02390
    02391       td->str = signal_type[secondary_signal][primary_signal];
    02392       break;
    02393     }
    02394
    02395     case RAIL_TILE_DEPOT:
    02396       td->str = STR_1023_RAILROAD_TRAIN_DEPOT;
    02397       break;
    02398
    02399     case RAIL_TILE_WAYPOINT:
    02400     default:
    02401       td->str = STR_LANDINFO_WAYPOINT;
    02402       break;
    02403   }
    02404 }
    02405
    02406 static void ChangeTileOwner_Track(TileIndex tile, Owner old_owner, Owner new_owner)
    02407 {
    02408   if (!IsTileOwner(tile, old_owner)) return;
    02409
    02410   if (new_owner != INVALID_OWNER) {
    02411     SetTileOwner(tile, new_owner);
    02412   } else {
    02413     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
    02414   }
    02415 }
    02416
    02417 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
    02418 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
    02419 static const signed char _deltacoord_leaveoffset[8] = {
    02420   -1,  0,  1,  0, /* x */
    02421    0,  1,  0, -1  /* y */
    02422 };
    02423
    02424
    02430 int TicksToLeaveDepot(const Vehicle *v)
    02431 {
    02432   DiagDirection dir = GetRailDepotDirection(v->tile);
    02433   int length = v->u.rail.cached_veh_length;
    02434
    02435   switch (dir) {
    02436     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
    02437     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
    02438     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
    02439     default:
    02440     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
    02441   }
    02442
    02443   return 0; // make compilers happy
    02444 }
    02445
    02448 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *v, TileIndex tile, int x, int y)
    02449 {
    02450   byte fract_coord;
    02451   byte fract_coord_leave;
    02452   DiagDirection dir;
    02453   int length;
    02454
    02455   /* this routine applies only to trains in depot tiles */
    02456   if (v->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
    02457
    02458   /* depot direction */
    02459   dir = GetRailDepotDirection(tile);
    02460
    02461   /* calculate the point where the following wagon should be activated
    02462    * this depends on the length of the current vehicle */
    02463   length = v->u.rail.cached_veh_length;
    02464
    02465   fract_coord_leave =
    02466     ((_fractcoords_enter[dir] & 0x0F) + // x
    02467       (length + 1) * _deltacoord_leaveoffset[dir]) +
    02468     (((_fractcoords_enter[dir] >> 4) +  // y
    02469       ((length + 1) * _deltacoord_leaveoffset[dir+4])) << 4);
    02470
    02471   fract_coord = (x & 0xF) + ((y & 0xF) << 4);
    02472
    02473   if (_fractcoords_behind[dir] == fract_coord) {
    02474     /* make sure a train is not entering the tile from behind */
    02475     return VETSB_CANNOT_ENTER;
    02476   } else if (_fractcoords_enter[dir] == fract_coord) {
    02477     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
    02478       /* enter the depot */
    02479       v->u.rail.track = TRACK_BIT_DEPOT,
    02480       v->vehstatus |= VS_HIDDEN; // hide it
    02481       v->direction = ReverseDir(v->direction);
    02482       if (v->Next() == NULL) VehicleEnterDepot(v);
    02483       v->tile = tile;
    02484
    02485       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
    02486       return VETSB_ENTERED_WORMHOLE;
    02487     }
    02488   } else if (fract_coord_leave == fract_coord) {
    02489     if (DiagDirToDir(dir) == v->direction) {
    02490       /* leave the depot? */
    02491       if ((v = v->Next()) != NULL) {
    02492         v->vehstatus &= ~VS_HIDDEN;
    02493         v->u.rail.track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
    02494       }
    02495     }
    02496   }
    02497
    02498   return VETSB_CONTINUE;
    02499 }
    02500
    02512 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, uint z_old, Slope tileh_old, uint z_new, Slope tileh_new, TrackBits rail_bits)
    02513 {
    02514   if (!_settings_game.construction.build_on_slopes || !AutoslopeEnabled()) return CMD_ERROR;
    02515
    02516   /* Is the slope-rail_bits combination valid in general? I.e. is it safe to call GetRailFoundation() ? */
    02517   if (CmdFailed(CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile))) return CMD_ERROR;
    02518
    02519   /* Get the slopes on top of the foundations */
    02520   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
    02521   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
    02522
    02523   Corner track_corner;
    02524   switch (rail_bits) {
    02525     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
    02526     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
    02527     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
    02528     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
    02529
    02530     /* Surface slope must not be changed */
    02531     default: return (((z_old != z_new) || (tileh_old != tileh_new)) ? CMD_ERROR : CommandCost(EXPENSES_CONSTRUCTION, _price.terraform));
    02532   }
    02533
    02534   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
    02535   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
    02536   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
    02537   if (z_old != z_new) return CMD_ERROR;
    02538
    02539   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    02540   /* Make the ground dirty, if surface slope has changed */
    02541   if (tileh_old != tileh_new) {
    02542     /* If there is flat water on the lower halftile add the cost for clearing it */
    02543     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price.clear_water);
    02544     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02545   }
    02546   return  cost;
    02547 }
    02548
    02549 static CommandCost TerraformTile_Track(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
    02550 {
    02551   uint z_old;
    02552   Slope tileh_old = GetTileSlope(tile, &z_old);
    02553   if (IsPlainRailTile(tile)) {
    02554     TrackBits rail_bits = GetTrackBits(tile);
    02555     /* Is there flat water on the lower halftile, that must be cleared expensively? */
    02556     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
    02557
    02558     _error_message = STR_1008_MUST_REMOVE_RAILROAD_TRACK;
    02559
    02560     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
    02561     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
    02562
    02563     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
    02564     Corner allowed_corner;
    02565     switch (rail_bits) {
    02566       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
    02567       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
    02568       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
    02569       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
    02570       default: return autoslope_result;
    02571     }
    02572
    02573     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
    02574
    02575     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
    02576     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
    02577
    02578     /* Everything is valid, which only changes allowed_corner */
    02579     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
    02580       if (allowed_corner == corner) continue;
    02581       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
    02582     }
    02583
    02584     /* Make the ground dirty */
    02585     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02586
    02587     /* allow terraforming */
    02588     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price.clear_water : (Money)0);
    02589   } else {
    02590     if (_settings_game.construction.build_on_slopes && AutoslopeEnabled()) {
    02591       switch (GetRailTileType(tile)) {
    02592         case RAIL_TILE_WAYPOINT: {
    02593           CommandCost cost = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, GetRailWaypointBits(tile));
    02594           if (!CmdFailed(cost)) return cost; // allow autoslope
    02595           break;
    02596         }
    02597
    02598         case RAIL_TILE_DEPOT:
    02599           if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    02600           break;
    02601
    02602         default: NOT_REACHED();
    02603       }
    02604     }
    02605   }
    02606   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    02607 }
    02608
    02609
    02610 extern const TileTypeProcs _tile_type_rail_procs = {
    02611   DrawTile_Track,           // draw_tile_proc
    02612   GetSlopeZ_Track,          // get_slope_z_proc
    02613   ClearTile_Track,          // clear_tile_proc
    02614   GetAcceptedCargo_Track,   // get_accepted_cargo_proc
    02615   GetTileDesc_Track,        // get_tile_desc_proc
    02616   GetTileTrackStatus_Track, // get_tile_track_status_proc
    02617   ClickTile_Track,          // click_tile_proc
    02618   AnimateTile_Track,        // animate_tile_proc
    02619   TileLoop_Track,           // tile_loop_clear
    02620   ChangeTileOwner_Track,    // change_tile_owner_clear
    02621   NULL,                     // get_produced_cargo_proc
    02622   VehicleEnter_Track,       // vehicle_enter_tile_proc
    02623   GetFoundation_Track,      // get_foundation_proc
    02624   TerraformTile_Track,      // terraform_tile_proc
    02625 };