# rail_cmd.cpp

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    00001 /* $Id: rail_cmd.cpp 16324 2009-05-16 20:29:53Z 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 (!IsPlainRailTile(tile)) return CMD_ERROR;
    00325
    00326       if (!IsCompatibleRail(GetRailType(tile), railtype)) return_cmd_error(STR_1001_IMPOSSIBLE_TRACK_COMBINATION);
    00327
    00328       if (!CheckTrackCombination(tile, trackbit, flags) ||
    00329           !EnsureNoTrainOnTrack(tile, track)) {
    00330         return CMD_ERROR;
    00331       }
    00332
    00333       ret = CheckRailSlope(tileh, trackbit, GetTrackBits(tile), tile);
    00334       if (CmdFailed(ret)) return ret;
    00335       cost.AddCost(ret);
    00336
    00337       /* If the rail types don't match, try to convert only if engines of
    00338        * the new rail type are not powered on the present rail type and engines of
    00339        * the present rail type are powered on the new rail type. */
    00340       if (GetRailType(tile) != railtype && !HasPowerOnRail(railtype, GetRailType(tile))) {
    00341         if (HasPowerOnRail(GetRailType(tile), railtype)) {
    00342           ret = DoCommand(tile, tile, railtype, flags, CMD_CONVERT_RAIL);
    00343           if (CmdFailed(ret)) return ret;
    00344           cost.AddCost(ret);
    00345         } else {
    00346           return CMD_ERROR;
    00347         }
    00348       }
    00349
    00350       if (flags & DC_EXEC) {
    00351         SetRailGroundType(tile, RAIL_GROUND_BARREN);
    00352         SetTrackBits(tile, GetTrackBits(tile) | trackbit);
    00353       }
    00354       break;
    00355
    00356     case MP_ROAD:
    00357 #define M(x) (1 << (x))
    00358       /* Level crossings may only be built on these slopes */
    00359       if (!HasBit(M(SLOPE_SEN) | M(SLOPE_ENW) | M(SLOPE_NWS) | M(SLOPE_NS) | M(SLOPE_WSE) | M(SLOPE_EW) | M(SLOPE_FLAT), tileh)) {
    00360         return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00361       }
    00362 #undef M
    00363
    00364       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00365
    00366       if (IsNormalRoad(tile)) {
    00367         if (HasRoadWorks(tile)) return_cmd_error(STR_ROAD_WORKS_IN_PROGRESS);
    00368
    00369         if (GetDisallowedRoadDirections(tile) != DRD_NONE) return_cmd_error(STR_ERR_CROSSING_ON_ONEWAY_ROAD);
    00370
    00371         RoadTypes roadtypes = GetRoadTypes(tile);
    00372         RoadBits road = GetRoadBits(tile, ROADTYPE_ROAD);
    00373         RoadBits tram = GetRoadBits(tile, ROADTYPE_TRAM);
    00374         switch (roadtypes) {
    00375           default: break;
    00376           case ROADTYPES_TRAM:
    00377             /* Tram crossings must always have road. */
    00378             if (flags & DC_EXEC) SetRoadOwner(tile, ROADTYPE_ROAD, _current_company);
    00379             roadtypes |= ROADTYPES_ROAD;
    00380             break;
    00381
    00382           case ROADTYPES_ALL:
    00383             if (road != tram) return CMD_ERROR;
    00384             break;
    00385         }
    00386
    00387         road |= tram;
    00388
    00389         if ((track == TRACK_X && road == ROAD_Y) ||
    00390             (track == TRACK_Y && road == ROAD_X)) {
    00391           if (flags & DC_EXEC) {
    00392             MakeRoadCrossing(tile, GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), _current_company, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, roadtypes, GetTownIndex(tile));
    00393             UpdateLevelCrossing(tile, false);
    00394           }
    00395           break;
    00396         }
    00397       }
    00398
    00399       if (IsLevelCrossing(tile) && GetCrossingRailBits(tile) == trackbit) {
    00400         return_cmd_error(STR_1007_ALREADY_BUILT);
    00401       }
    00402       /* FALLTHROUGH */
    00403
    00404     default:
    00405       /* Will there be flat water on the lower halftile? */
    00406       bool water_ground = IsTileType(tile, MP_WATER) && IsSlopeWithOneCornerRaised(tileh);
    00407
    00408       ret = CheckRailSlope(tileh, trackbit, TRACK_BIT_NONE, tile);
    00409       if (CmdFailed(ret)) return ret;
    00410       cost.AddCost(ret);
    00411
    00412       ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00413       if (CmdFailed(ret)) return ret;
    00414       cost.AddCost(ret);
    00415
    00416       if (water_ground) {
    00417         cost.AddCost(-_price.clear_water);
    00418         cost.AddCost(_price.clear_roughland);
    00419       }
    00420
    00421       if (flags & DC_EXEC) {
    00422         MakeRailNormal(tile, _current_company, trackbit, railtype);
    00423         if (water_ground) SetRailGroundType(tile, RAIL_GROUND_WATER);
    00424       }
    00425       break;
    00426   }
    00427
    00428   if (flags & DC_EXEC) {
    00429     MarkTileDirtyByTile(tile);
    00430     AddTrackToSignalBuffer(tile, track, _current_company);
    00431     YapfNotifyTrackLayoutChange(tile, track);
    00432   }
    00433
    00434   return cost.AddCost(RailBuildCost(railtype));
    00435 }
    00436
    00443 CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00444 {
    00445   Track track = (Track)p2;
    00446   TrackBits trackbit;
    00447   CommandCost cost(EXPENSES_CONSTRUCTION, _price.remove_rail );
    00448   bool crossing = false;
    00449
    00450   if (!ValParamTrackOrientation((Track)p2)) return CMD_ERROR;
    00451   trackbit = TrackToTrackBits(track);
    00452
    00453   /* Need to read tile owner now because it may change when the rail is removed
    00454    * Also, in case of floods, _current_company != owner
    00455    * There may be invalid tiletype even in exec run (when removing long track),
    00456    * so do not call GetTileOwner(tile) in any case here */
    00457   Owner owner = INVALID_OWNER;
    00458
    00459   Vehicle *v = NULL;
    00460
    00461   switch (GetTileType(tile)) {
    00462     case MP_ROAD: {
    00463       if (!IsLevelCrossing(tile) ||
    00464           GetCrossingRailBits(tile) != trackbit ||
    00465           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
    00466           (!(flags & DC_BANKRUPT) && !EnsureNoVehicleOnGround(tile))) {
    00467         return CMD_ERROR;
    00468       }
    00469
    00470       if (flags & DC_EXEC) {
    00471         if (HasReservedTracks(tile, trackbit)) {
    00472           v = GetTrainForReservation(tile, track);
    00473           if (v != NULL) FreeTrainTrackReservation(v);
    00474         }
    00475         owner = GetTileOwner(tile);
    00476         MakeRoadNormal(tile, GetCrossingRoadBits(tile), GetRoadTypes(tile), GetTownIndex(tile), GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM));
    00477       }
    00478       break;
    00479     }
    00480
    00481     case MP_RAILWAY: {
    00482       TrackBits present;
    00483
    00484       if (!IsPlainRailTile(tile) ||
    00485           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
    00486           !EnsureNoTrainOnTrack(tile, track)) {
    00487         return CMD_ERROR;
    00488       }
    00489
    00490       present = GetTrackBits(tile);
    00491       if ((present & trackbit) == 0) return CMD_ERROR;
    00492       if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
    00493
    00494       /* Charge extra to remove signals on the track, if they are there */
    00495       if (HasSignalOnTrack(tile, track))
    00496         cost.AddCost(DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS));
    00497
    00498       if (flags & DC_EXEC) {
    00499         if (HasReservedTracks(tile, trackbit)) {
    00500           v = GetTrainForReservation(tile, track);
    00501           if (v != NULL) FreeTrainTrackReservation(v);
    00502         }
    00503         owner = GetTileOwner(tile);
    00504         present ^= trackbit;
    00505         if (present == 0) {
    00506           Slope tileh = GetTileSlope(tile, NULL);
    00507           /* If there is flat water on the lower halftile, convert the tile to shore so the water remains */
    00508           if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh)) {
    00509             MakeShore(tile);
    00510           } else {
    00511             DoClearSquare(tile);
    00512           }
    00513         } else {
    00514           SetTrackBits(tile, present);
    00515           SetTrackReservation(tile, GetTrackReservation(tile) & present);
    00516         }
    00517       }
    00518       break;
    00519     }
    00520
    00521     default: return CMD_ERROR;
    00522   }
    00523
    00524   if (flags & DC_EXEC) {
    00525     /* if we got that far, 'owner' variable is set correctly */
    00526     assert(IsValidCompanyID(owner));
    00527
    00528     MarkTileDirtyByTile(tile);
    00529     if (crossing) {
    00530       /* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we
    00531        * are removing one of these pieces, we'll need to update signals for
    00532        * both directions explicitly, as after the track is removed it won't
    00533        * 'connect' with the other piece. */
    00534       AddTrackToSignalBuffer(tile, TRACK_X, owner);
    00535       AddTrackToSignalBuffer(tile, TRACK_Y, owner);
    00536       YapfNotifyTrackLayoutChange(tile, TRACK_X);
    00537       YapfNotifyTrackLayoutChange(tile, TRACK_Y);
    00538     } else {
    00539       AddTrackToSignalBuffer(tile, track, owner);
    00540       YapfNotifyTrackLayoutChange(tile, track);
    00541     }
    00542
    00543     if (v != NULL) TryPathReserve(v, true);
    00544   }
    00545
    00546   return cost;
    00547 }
    00548
    00549
    00557 bool FloodHalftile(TileIndex t)
    00558 {
    00559   assert(IsPlainRailTile(t));
    00560
    00561   bool flooded = false;
    00562   if (GetRailGroundType(t) == RAIL_GROUND_WATER) return flooded;
    00563
    00564   Slope tileh = GetTileSlope(t, NULL);
    00565   TrackBits rail_bits = GetTrackBits(t);
    00566
    00567   if (IsSlopeWithOneCornerRaised(tileh)) {
    00568     TrackBits lower_track = CornerToTrackBits(OppositeCorner(GetHighestSlopeCorner(tileh)));
    00569
    00570     TrackBits to_remove = lower_track & rail_bits;
    00571     if (to_remove != 0) {
    00572       _current_company = OWNER_WATER;
    00573       if (CmdFailed(DoCommand(t, 0, FIND_FIRST_BIT(to_remove), DC_EXEC, CMD_REMOVE_SINGLE_RAIL))) return flooded; // not yet floodable
    00574       flooded = true;
    00575       rail_bits = rail_bits & ~to_remove;
    00576       if (rail_bits == 0) {
    00577         MakeShore(t);
    00578         MarkTileDirtyByTile(t);
    00579         return flooded;
    00580       }
    00581     }
    00582
    00583     if (IsNonContinuousFoundation(GetRailFoundation(tileh, rail_bits))) {
    00584       flooded = true;
    00585       SetRailGroundType(t, RAIL_GROUND_WATER);
    00586       MarkTileDirtyByTile(t);
    00587     }
    00588   } else {
    00589     /* Make shore on steep slopes and 'three-corners-raised'-slopes. */
    00590     if (ApplyFoundationToSlope(GetRailFoundation(tileh, rail_bits), &tileh) == 0) {
    00591       if (IsSteepSlope(tileh) || IsSlopeWithThreeCornersRaised(tileh)) {
    00592         flooded = true;
    00593         SetRailGroundType(t, RAIL_GROUND_WATER);
    00594         MarkTileDirtyByTile(t);
    00595       }
    00596     }
    00597   }
    00598   return flooded;
    00599 }
    00600
    00601 static const TileIndexDiffC _trackdelta[] = {
    00602   { -1,  0 }, {  0,  1 }, { -1,  0 }, {  0,  1 }, {  1,  0 }, {  0,  1 },
    00603   {  0,  0 },
    00604   {  0,  0 },
    00605   {  1,  0 }, {  0, -1 }, {  0, -1 }, {  1,  0 }, {  0, -1 }, { -1,  0 },
    00606   {  0,  0 },
    00607   {  0,  0 }
    00608 };
    00609
    00610
    00611 static CommandCost ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)
    00612 {
    00613   int x = TileX(start);
    00614   int y = TileY(start);
    00615   int ex = TileX(end);
    00616   int ey = TileY(end);
    00617   int dx, dy, trdx, trdy;
    00618
    00619   if (!ValParamTrackOrientation(TrackdirToTrack(*trackdir))) return CMD_ERROR;
    00620
    00621   /* calculate delta x,y from start to end tile */
    00622   dx = ex - x;
    00623   dy = ey - y;
    00624
    00625   /* calculate delta x,y for the first direction */
    00626   trdx = _trackdelta[*trackdir].x;
    00627   trdy = _trackdelta[*trackdir].y;
    00628
    00629   if (!IsDiagonalTrackdir(*trackdir)) {
    00630     trdx += _trackdelta[*trackdir ^ 1].x;
    00631     trdy += _trackdelta[*trackdir ^ 1].y;
    00632   }
    00633
    00634   /* validate the direction */
    00635   while (
    00636     (trdx <= 0 && dx > 0) ||
    00637     (trdx >= 0 && dx < 0) ||
    00638     (trdy <= 0 && dy > 0) ||
    00639     (trdy >= 0 && dy < 0)
    00640   ) {
    00641     if (!HasBit(*trackdir, 3)) { // first direction is invalid, try the other
    00642       SetBit(*trackdir, 3); // reverse the direction
    00643       trdx = -trdx;
    00644       trdy = -trdy;
    00645     } else { // other direction is invalid too, invalid drag
    00646       return CMD_ERROR;
    00647     }
    00648   }
    00649
    00650   /* (for diagonal tracks, this is already made sure of by above test), but:
    00651    * for non-diagonal tracks, check if the start and end tile are on 1 line */
    00652   if (!IsDiagonalTrackdir(*trackdir)) {
    00653     trdx = _trackdelta[*trackdir].x;
    00654     trdy = _trackdelta[*trackdir].y;
    00655     if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx))
    00656       return CMD_ERROR;
    00657   }
    00658
    00659   return CommandCost();
    00660 }
    00661
    00671 static CommandCost CmdRailTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00672 {
    00673   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
    00674   Track track = (Track)GB(p2, 4, 3);
    00675   bool remove = HasBit(p2, 7);
    00676   RailType railtype = (RailType)GB(p2, 0, 4);
    00677
    00678   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
    00679   if (p1 >= MapSize()) return CMD_ERROR;
    00680   TileIndex end_tile = p1;
    00681   Trackdir trackdir = TrackToTrackdir(track);
    00682
    00683   if (CmdFailed(ValidateAutoDrag(&trackdir, tile, end_tile))) return CMD_ERROR;
    00684
    00685   if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, tile);
    00686
    00687   for (;;) {
    00688     ret = DoCommand(tile, railtype, TrackdirToTrack(trackdir), flags, remove ? CMD_REMOVE_SINGLE_RAIL : CMD_BUILD_SINGLE_RAIL);
    00689
    00690     if (CmdFailed(ret)) {
    00691       if (_error_message != STR_1007_ALREADY_BUILT && !remove) break;
    00692       _error_message = INVALID_STRING_ID;
    00693     } else {
    00694       total_cost.AddCost(ret);
    00695     }
    00696
    00697     if (tile == end_tile) break;
    00698
    00699     tile += ToTileIndexDiff(_trackdelta[trackdir]);
    00700
    00701     /* toggle railbit for the non-diagonal tracks */
    00702     if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
    00703   }
    00704
    00705   return (total_cost.GetCost() == 0) ? CommandCost(remove ? INVALID_STRING_ID : (_error_message == INVALID_STRING_ID ? STR_1007_ALREADY_BUILT : _error_message)) : total_cost;
    00706 }
    00707
    00719 CommandCost CmdBuildRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00720 {
    00721   return CmdRailTrackHelper(tile, flags, p1, ClrBit(p2, 7), text);
    00722 }
    00723
    00735 CommandCost CmdRemoveRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00736 {
    00737   return CmdRailTrackHelper(tile, flags, p1, SetBit(p2, 7), text);
    00738 }
    00739
    00749 CommandCost CmdBuildTrainDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00750 {
    00751   Slope tileh;
    00752
    00753   /* check railtype and valid direction for depot (0 through 3), 4 in total */
    00754   if (!ValParamRailtype((RailType)p1)) return CMD_ERROR;
    00755
    00756   tileh = GetTileSlope(tile, NULL);
    00757
    00758   DiagDirection dir = Extract<DiagDirection, 0>(p2);
    00759
    00760   /* Prohibit construction if
    00761    * The tile is non-flat AND
    00762    * 1) build-on-slopes is disabled
    00763    * 2) the tile is steep i.e. spans two height levels
    00764    * 3) the exit points in the wrong direction
    00765    */
    00766
    00767   if (tileh != SLOPE_FLAT && (
    00768         !_settings_game.construction.build_on_slopes ||
    00769         IsSteepSlope(tileh) ||
    00770         !CanBuildDepotByTileh(dir, tileh)
    00771       )) {
    00772     return_cmd_error(STR_0007_FLAT_LAND_REQUIRED);
    00773   }
    00774
    00775   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00776   if (CmdFailed(cost)) return CMD_ERROR;
    00777
    00778   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00779
    00780   if (!Depot::CanAllocateItem()) return CMD_ERROR;
    00781
    00782   if (flags & DC_EXEC) {
    00783     Depot *d = new Depot(tile);
    00784     MakeRailDepot(tile, _current_company, dir, (RailType)p1);
    00785     MarkTileDirtyByTile(tile);
    00786
    00787     d->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
    00788
    00789     AddSideToSignalBuffer(tile, INVALID_DIAGDIR, _current_company);
    00790     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
    00791   }
    00792
    00793   return cost.AddCost(_price.build_train_depot);
    00794 }
    00795
    00814 CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00815 {
    00816   Track track = (Track)GB(p1, 0, 3);
    00817   bool ctrl_pressed = HasBit(p1, 3); // was the CTRL button pressed
    00818   SignalVariant sigvar = (ctrl_pressed ^ HasBit(p1, 4)) ? SIG_SEMAPHORE : SIG_ELECTRIC; // the signal variant of the new signal
    00819   SignalType sigtype = (SignalType)GB(p1, 5, 3); // the signal type of the new signal
    00820   bool convert_signal = HasBit(p1, 8); // convert button pressed
    00821   SignalType cycle_start = (SignalType)GB(p1, 9, 3);
    00822   SignalType cycle_stop = (SignalType)GB(p1, 12, 3);
    00823   CommandCost cost;
    00824   uint num_dir_cycle = GB(p1, 15, 2);
    00825
    00826   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
    00827
    00828   if (!ValParamTrackOrientation(track) || !IsTileType(tile, MP_RAILWAY) || !EnsureNoTrainOnTrack(tile, track))
    00829     return CMD_ERROR;
    00830
    00831   /* Protect against invalid signal copying */
    00832   if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
    00833
    00834   /* You can only build signals on plain rail tiles, and the selected track must exist */
    00835   if (!IsPlainRailTile(tile) || !HasTrack(tile, track)) return CMD_ERROR;
    00836
    00837   if (!CheckTileOwnership(tile)) return CMD_ERROR;
    00838
    00839   {
    00840     /* See if this is a valid track combination for signals, (ie, no overlap) */
    00841     TrackBits trackbits = GetTrackBits(tile);
    00842     if (KillFirstBit(trackbits) != TRACK_BIT_NONE && // More than one track present
    00843         trackbits != TRACK_BIT_HORZ &&
    00844         trackbits != TRACK_BIT_VERT) {
    00845       return_cmd_error(STR_1005_NO_SUITABLE_RAILROAD_TRACK);
    00846     }
    00847   }
    00848
    00849   /* In case we don't want to change an existing signal, return without error. */
    00850   if (HasBit(p1, 17) && HasSignalOnTrack(tile, track)) return CommandCost();
    00851
    00852   /* you can not convert a signal if no signal is on track */
    00853   if (convert_signal && !HasSignalOnTrack(tile, track)) return CMD_ERROR;
    00854
    00855   if (!HasSignalOnTrack(tile, track)) {
    00856     /* build new signals */
    00857     cost = CommandCost(EXPENSES_CONSTRUCTION, _price.build_signals);
    00858   } else {
    00859     if (p2 != 0 && sigvar != GetSignalVariant(tile, track)) {
    00860       /* convert signals <-> semaphores */
    00861       cost = CommandCost(EXPENSES_CONSTRUCTION, _price.build_signals + _price.remove_signals);
    00862
    00863     } else if (convert_signal) {
    00864       /* convert button pressed */
    00865       if (ctrl_pressed || GetSignalVariant(tile, track) != sigvar) {
    00866         /* convert electric <-> semaphore */
    00867         cost = CommandCost(EXPENSES_CONSTRUCTION, _price.build_signals + _price.remove_signals);
    00868       } else {
    00869         /* it is free to change signal type: normal-pre-exit-combo */
    00870         cost = CommandCost();
    00871       }
    00872
    00873     } else {
    00874       /* it is free to change orientation/pre-exit-combo signals */
    00875       cost = CommandCost();
    00876     }
    00877   }
    00878
    00879   if (flags & DC_EXEC) {
    00880     Vehicle *v = NULL;
    00881     /* The new/changed signal could block our path. As this can lead to
    00882      * stale reservations, we clear the path reservation here and try
    00883      * to redo it later on. */
    00884     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
    00885       v = GetTrainForReservation(tile, track);
    00886       if (v != NULL) FreeTrainTrackReservation(v);
    00887     }
    00888
    00889     if (!HasSignals(tile)) {
    00890       /* there are no signals at all on this tile yet */
    00891       SetHasSignals(tile, true);
    00892       SetSignalStates(tile, 0xF); // all signals are on
    00893       SetPresentSignals(tile, 0); // no signals built by default
    00894       SetSignalType(tile, track, sigtype);
    00895       SetSignalVariant(tile, track, sigvar);
    00896     }
    00897
    00898     if (p2 == 0) {
    00899       if (!HasSignalOnTrack(tile, track)) {
    00900         /* build new signals */
    00901         SetPresentSignals(tile, GetPresentSignals(tile) | (IsPbsSignal(sigtype) ? KillFirstBit(SignalOnTrack(track)) : SignalOnTrack(track)));
    00902         SetSignalType(tile, track, sigtype);
    00903         SetSignalVariant(tile, track, sigvar);
    00904         while (num_dir_cycle-- > 0) CycleSignalSide(tile, track);
    00905       } else {
    00906         if (convert_signal) {
    00907           /* convert signal button pressed */
    00908           if (ctrl_pressed) {
    00909             /* toggle the pressent signal variant: SIG_ELECTRIC <-> SIG_SEMAPHORE */
    00910             SetSignalVariant(tile, track, (GetSignalVariant(tile, track) == SIG_ELECTRIC) ? SIG_SEMAPHORE : SIG_ELECTRIC);
    00911             /* Query current signal type so the check for PBS signals below works. */
    00912             sigtype = GetSignalType(tile, track);
    00913           } else {
    00914             /* convert the present signal to the chosen type and variant */
    00915             SetSignalType(tile, track, sigtype);
    00916             SetSignalVariant(tile, track, sigvar);
    00917             if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
    00918               SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
    00919             }
    00920           }
    00921
    00922         } else if (ctrl_pressed) {
    00923           /* cycle between cycle_start and cycle_end */
    00924           sigtype = (SignalType)(GetSignalType(tile, track) + 1);
    00925
    00926           if (sigtype < cycle_start || sigtype > cycle_stop) sigtype = cycle_start;
    00927
    00928           SetSignalType(tile, track, sigtype);
    00929           if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
    00930             SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
    00931           }
    00932         } else {
    00933           /* cycle the signal side: both -> left -> right -> both -> ... */
    00934           CycleSignalSide(tile, track);
    00935           /* Query current signal type so the check for PBS signals below works. */
    00936           sigtype = GetSignalType(tile, track);
    00937         }
    00938       }
    00939     } else {
    00940       /* If CmdBuildManySignals is called with copying signals, just copy the
    00941        * direction of the first signal given as parameter by CmdBuildManySignals */
    00942       SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | (p2 & SignalOnTrack(track)));
    00943       SetSignalVariant(tile, track, sigvar);
    00944       SetSignalType(tile, track, sigtype);
    00945     }
    00946
    00947     if (IsPbsSignal(sigtype)) {
    00948       /* PBS signals should show red unless they are on a reservation. */
    00949       uint mask = GetPresentSignals(tile) & SignalOnTrack(track);
    00950       SetSignalStates(tile, (GetSignalStates(tile) & ~mask) | ((HasBit(GetTrackReservation(tile), track) ? UINT_MAX : 0) & mask));
    00951     }
    00952     MarkTileDirtyByTile(tile);
    00953     AddTrackToSignalBuffer(tile, track, _current_company);
    00954     YapfNotifyTrackLayoutChange(tile, track);
    00955     if (v != NULL) TryPathReserve(v, true);
    00956   }
    00957
    00958   return cost;
    00959 }
    00960
    00961 static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
    00962 {
    00963   tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
    00964   if (tile == INVALID_TILE) return false;
    00965
    00966   /* Check for track bits on the new tile */
    00967   TrackdirBits trackdirbits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
    00968
    00969   if (TracksOverlap(TrackdirBitsToTrackBits(trackdirbits))) return false;
    00970   trackdirbits &= TrackdirReachesTrackdirs(trackdir);
    00971
    00972   /* No track bits, must stop */
    00973   if (trackdirbits == TRACKDIR_BIT_NONE) return false;
    00974
    00975   /* Get the first track dir */
    00976   trackdir = RemoveFirstTrackdir(&trackdirbits);
    00977
    00978   /* Any left? It's a junction so we stop */
    00979   if (trackdirbits != TRACKDIR_BIT_NONE) return false;
    00980
    00981   switch (GetTileType(tile)) {
    00982     case MP_RAILWAY:
    00983       if (IsRailDepot(tile)) return false;
    00984       if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
    00985       signal_ctr++;
    00986       if (IsDiagonalTrackdir(trackdir)) {
    00987         signal_ctr++;
    00988         /* Ensure signal_ctr even so X and Y pieces get signals */
    00989         ClrBit(signal_ctr, 0);
    00990       }
    00991       return true;
    00992
    00993     case MP_ROAD:
    00994       if (!IsLevelCrossing(tile)) return false;
    00995       signal_ctr += 2;
    00996       return true;
    00997
    00998     case MP_TUNNELBRIDGE: {
    00999       TileIndex orig_tile = tile; // backup old value
    01000
    01001       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
    01002       if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
    01003
    01004       /* Skip to end of tunnel or bridge
    01005        * note that tile is a parameter by reference, so it must be updated */
    01006       tile = GetOtherTunnelBridgeEnd(tile);
    01007
    01008       signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
    01009       return true;
    01010     }
    01011
    01012     default: return false;
    01013   }
    01014 }
    01015
    01029 static CommandCost CmdSignalTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01030 {
    01031   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
    01032   int signal_ctr;
    01033   byte signals;
    01034   bool error = true;
    01035   TileIndex end_tile;
    01036   TileIndex start_tile = tile;
    01037
    01038   Track track = (Track)GB(p2, 0, 3);
    01039   bool mode = HasBit(p2, 3);
    01040   bool semaphores = HasBit(p2, 4);
    01041   bool remove = HasBit(p2, 5);
    01042   bool autofill = HasBit(p2, 6);
    01043   Trackdir trackdir = TrackToTrackdir(track);
    01044   byte signal_density = GB(p2, 24, 8);
    01045
    01046   if (p1 >= MapSize()) return CMD_ERROR;
    01047   end_tile = p1;
    01048   if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
    01049
    01050   if (!IsTileType(tile, MP_RAILWAY) || !IsPlainRailTile(tile)) return CMD_ERROR;
    01051
    01052   /* for vertical/horizontal tracks, double the given signals density
    01053    * since the original amount will be too dense (shorter tracks) */
    01054   signal_density *= 2;
    01055
    01056   if (CmdFailed(ValidateAutoDrag(&trackdir, tile, end_tile))) return CMD_ERROR;
    01057
    01058   track = TrackdirToTrack(trackdir); // trackdir might have changed, keep track in sync
    01059   Trackdir start_trackdir = trackdir;
    01060
    01061   /* Must start on a valid track to be able to avoid loops */
    01062   if (!HasTrack(tile, track)) return CMD_ERROR;
    01063
    01064   SignalType sigtype = (SignalType)GB(p2, 7, 3);
    01065   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
    01066
    01067   /* copy the signal-style of the first rail-piece if existing */
    01068   if (HasSignalOnTrack(tile, track)) {
    01069     signals = GetPresentSignals(tile) & SignalOnTrack(track);
    01070     assert(signals != 0);
    01071
    01072     /* copy signal/semaphores style (independent of CTRL) */
    01073     semaphores = GetSignalVariant(tile, track) != SIG_ELECTRIC;
    01074
    01075     sigtype = GetSignalType(tile, track);
    01076     /* Don't but copy pre-signal type */
    01077     if (sigtype < SIGTYPE_PBS) sigtype = SIGTYPE_NORMAL;
    01078   } else { // no signals exist, drag a two-way signal stretch
    01079     signals = IsPbsSignal(sigtype) ? SignalAlongTrackdir(trackdir) : SignalOnTrack(track);
    01080   }
    01081
    01082   byte signal_dir = 0;
    01083   if (signals & SignalAlongTrackdir(trackdir))   SetBit(signal_dir, 0);
    01084   if (signals & SignalAgainstTrackdir(trackdir)) SetBit(signal_dir, 1);
    01085
    01086   /* signal_ctr         - amount of tiles already processed
    01087    * signals_density    - setting to put signal on every Nth tile (double space on |, -- tracks)
    01088    **********
    01089    * trackdir   - trackdir to build with autorail
    01090    * semaphores - semaphores or signals
    01091    * signals    - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
    01092    *              and convert all others to semaphore/signal
    01093    * remove     - 1 remove signals, 0 build signals */
    01094   signal_ctr = 0;
    01095   for (;;) {
    01096     /* only build/remove signals with the specified density */
    01097     if ((remove && autofill) || signal_ctr % signal_density == 0) {
    01098       uint32 p1 = GB(TrackdirToTrack(trackdir), 0, 3);
    01099       SB(p1, 3, 1, mode);
    01100       SB(p1, 4, 1, semaphores);
    01101       SB(p1, 5, 3, sigtype);
    01102       if (!remove && signal_ctr == 0) SetBit(p1, 17);
    01103
    01104       /* Pick the correct orientation for the track direction */
    01105       signals = 0;
    01106       if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
    01107       if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
    01108
    01109       ret = DoCommand(tile, p1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
    01110
    01111       /* Be user-friendly and try placing signals as much as possible */
    01112       if (CmdSucceeded(ret)) {
    01113         error = false;
    01114         total_cost.AddCost(ret);
    01115       }
    01116     }
    01117
    01118     if (autofill) {
    01119       if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
    01120
    01121       /* Prevent possible loops */
    01122       if (tile == start_tile && trackdir == start_trackdir) break;
    01123     } else {
    01124       if (tile == end_tile) break;
    01125
    01126       tile += ToTileIndexDiff(_trackdelta[trackdir]);
    01127       signal_ctr++;
    01128
    01129       /* toggle railbit for the non-diagonal tracks (|, -- tracks) */
    01130       if (IsDiagonalTrackdir(trackdir)) {
    01131         signal_ctr++;
    01132       } else {
    01133         ToggleBit(trackdir, 0);
    01134       }
    01135     }
    01136   }
    01137
    01138   return error ? CMD_ERROR : total_cost;
    01139 }
    01140
    01156 CommandCost CmdBuildSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01157 {
    01158   return CmdSignalTrackHelper(tile, flags, p1, p2,text);
    01159 }
    01160
    01170 CommandCost CmdRemoveSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01171 {
    01172   Track track = (Track)GB(p1, 0, 3);
    01173
    01174   if (!ValParamTrackOrientation(track) ||
    01175       !IsTileType(tile, MP_RAILWAY) ||
    01176       !IsPlainRailTile(tile) ||
    01177       !HasTrack(tile, track) ||
    01178       !EnsureNoTrainOnTrack(tile, track) ||
    01179       !HasSignalOnTrack(tile, track)) {
    01180     return CMD_ERROR;
    01181   }
    01182
    01183   /* Only water can remove signals from anyone */
    01184   if (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) return CMD_ERROR;
    01185
    01186   /* Do it? */
    01187   if (flags & DC_EXEC) {
    01188     Vehicle *v = NULL;
    01189     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
    01190       v = GetTrainForReservation(tile, track);
    01191     }
    01192     SetPresentSignals(tile, GetPresentSignals(tile) & ~SignalOnTrack(track));
    01193
    01194     /* removed last signal from tile? */
    01195     if (GetPresentSignals(tile) == 0) {
    01196       SetSignalStates(tile, 0);
    01197       SetHasSignals(tile, false);
    01198       SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
    01199     }
    01200
    01201     AddTrackToSignalBuffer(tile, track, GetTileOwner(tile));
    01202     YapfNotifyTrackLayoutChange(tile, track);
    01203     if (v != NULL) TryPathReserve(v, false);
    01204
    01205     MarkTileDirtyByTile(tile);
    01206   }
    01207
    01208   return CommandCost(EXPENSES_CONSTRUCTION, _price.remove_signals);
    01209 }
    01210
    01226 CommandCost CmdRemoveSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01227 {
    01228   return CmdSignalTrackHelper(tile, flags, p1, SetBit(p2, 5), text); // bit 5 is remove bit
    01229 }
    01230
    01232 Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
    01233 {
    01234   /* Similiar checks as in TrainPowerChanged() */
    01235
    01236   if (v->type == VEH_TRAIN && !IsArticulatedPart(v)) {
    01237     const RailVehicleInfo *rvi = RailVehInfo(v->engine_type);
    01238     if (GetVehicleProperty(v, 0x0B, rvi->power) != 0) TrainPowerChanged(v->First());
    01239   }
    01240
    01241   return NULL;
    01242 }
    01243
    01251 CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01252 {
    01253   CommandCost cost(EXPENSES_CONSTRUCTION);
    01254   RailType totype = (RailType)p2;
    01255
    01256   if (!ValParamRailtype(totype)) return CMD_ERROR;
    01257   if (p1 >= MapSize()) return CMD_ERROR;
    01258
    01259   uint ex = TileX(tile);
    01260   uint ey = TileY(tile);
    01261   uint sx = TileX(p1);
    01262   uint sy = TileY(p1);
    01263
    01264   /* make sure sx,sy are smaller than ex,ey */
    01265   if (ex < sx) Swap(ex, sx);
    01266   if (ey < sy) Swap(ey, sy);
    01267
    01268   _error_message = STR_1005_NO_SUITABLE_RAILROAD_TRACK; // by default, there is no track to convert
    01269
    01270   for (uint x = sx; x <= ex; ++x) {
    01271     for (uint y = sy; y <= ey; ++y) {
    01272       TileIndex tile = TileXY(x, y);
    01273       TileType tt = GetTileType(tile);
    01274
    01275       /* Check if there is any track on tile */
    01276       switch (tt) {
    01277         case MP_RAILWAY:
    01278           break;
    01279         case MP_STATION:
    01280           if (!IsRailwayStation(tile)) continue;
    01281           break;
    01282         case MP_ROAD:
    01283           if (!IsLevelCrossing(tile)) continue;
    01284           break;
    01285         case MP_TUNNELBRIDGE:
    01286           if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
    01287           break;
    01288         default: continue;
    01289       }
    01290
    01291       /* Original railtype we are converting from */
    01292       RailType type = GetRailType(tile);
    01293
    01294       /* Converting to the same type or converting 'hidden' elrail -> rail */
    01295       if (type == totype || (_settings_game.vehicle.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
    01296
    01297       /* Trying to convert other's rail */
    01298       if (!CheckTileOwnership(tile)) continue;
    01299
    01300       SmallVector<Vehicle*, 2> vehicles_affected;
    01301
    01302       /* Vehicle on the tile when not converting Rail <-> ElRail
    01303        * Tunnels and bridges have special check later */
    01304       if (tt != MP_TUNNELBRIDGE) {
    01305         if (!IsCompatibleRail(type, totype) && !EnsureNoVehicleOnGround(tile)) continue;
    01306         if (flags & DC_EXEC) { // we can safely convert, too
    01307           TrackBits reserved = GetReservedTrackbits(tile);
    01308           Track     track;
    01309           while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
    01310             Vehicle *v = GetTrainForReservation(tile, track);
    01311             if (v != NULL && !HasPowerOnRail(v->u.rail.railtype, totype)) {
    01312               /* No power on new rail type, reroute. */
    01313               FreeTrainTrackReservation(v);
    01314               *vehicles_affected.Append() = v;
    01315             }
    01316           }
    01317
    01318           SetRailType(tile, totype);
    01319           MarkTileDirtyByTile(tile);
    01320           /* update power of train engines on this tile */
    01321           FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
    01322         }
    01323       }
    01324
    01325       switch (tt) {
    01326         case MP_RAILWAY:
    01327           switch (GetRailTileType(tile)) {
    01328             case RAIL_TILE_WAYPOINT:
    01329               if (flags & DC_EXEC) {
    01330                 /* notify YAPF about the track layout change */
    01331                 YapfNotifyTrackLayoutChange(tile, GetRailWaypointTrack(tile));
    01332               }
    01333               cost.AddCost(RailConvertCost(type, totype));
    01334               break;
    01335
    01336             case RAIL_TILE_DEPOT:
    01337               if (flags & DC_EXEC) {
    01338                 /* notify YAPF about the track layout change */
    01339                 YapfNotifyTrackLayoutChange(tile, GetRailDepotTrack(tile));
    01340
    01341                 /* Update build vehicle window related to this depot */
    01342                 InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
    01343                 InvalidateWindowData(WC_BUILD_VEHICLE, tile);
    01344               }
    01345               cost.AddCost(RailConvertCost(type, totype));
    01346               break;
    01347
    01348             default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
    01349               if (flags & DC_EXEC) {
    01350                 /* notify YAPF about the track layout change */
    01351                 TrackBits tracks = GetTrackBits(tile);
    01352                 while (tracks != TRACK_BIT_NONE) {
    01353                   YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
    01354                 }
    01355               }
    01356               cost.AddCost(RailConvertCost(type, totype) * CountBits(GetTrackBits(tile)));
    01357               break;
    01358           }
    01359           break;
    01360
    01361         case MP_TUNNELBRIDGE: {
    01362           TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
    01363
    01364           /* If both ends of tunnel/bridge are in the range, do not try to convert twice -
    01365            * it would cause assert because of different test and exec runs */
    01366           if (endtile < tile && TileX(endtile) >= sx && TileX(endtile) <= ex &&
    01367               TileY(endtile) >= sy && TileY(endtile) <= ey) continue;
    01368
    01369           /* When not coverting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
    01370           if (!IsCompatibleRail(GetRailType(tile), totype) &&
    01371               HasVehicleOnTunnelBridge(tile, endtile)) continue;
    01372
    01373           if (flags & DC_EXEC) {
    01374             Track track = DiagDirToDiagTrack(GetTunnelBridgeDirection(tile));
    01375             if (GetTunnelBridgeReservation(tile)) {
    01376               Vehicle *v = GetTrainForReservation(tile, track);
    01377               if (v != NULL && !HasPowerOnRail(v->u.rail.railtype, totype)) {
    01378                 /* No power on new rail type, reroute. */
    01379                 FreeTrainTrackReservation(v);
    01380                 *vehicles_affected.Append() = v;
    01381               }
    01382             }
    01383             SetRailType(tile, totype);
    01384             SetRailType(endtile, totype);
    01385
    01386             FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
    01387             FindVehicleOnPos(endtile, NULL, &UpdateTrainPowerProc);
    01388
    01389             YapfNotifyTrackLayoutChange(tile, track);
    01390             YapfNotifyTrackLayoutChange(endtile, track);
    01391
    01392             MarkTileDirtyByTile(tile);
    01393             MarkTileDirtyByTile(endtile);
    01394
    01395             if (IsBridge(tile)) {
    01396               TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
    01397               TileIndex t = tile + delta;
    01398               for (; t != endtile; t += delta) MarkTileDirtyByTile(t); // TODO encapsulate this into a function
    01399             }
    01400           }
    01401
    01402           cost.AddCost((GetTunnelBridgeLength(tile, endtile) + 2) * RailConvertCost(type, totype));
    01403         } break;
    01404
    01405         default: // MP_STATION, MP_ROAD
    01406           if (flags & DC_EXEC) {
    01407             Track track = ((tt == MP_STATION) ? GetRailStationTrack(tile) : GetCrossingRailTrack(tile));
    01408             YapfNotifyTrackLayoutChange(tile, track);
    01409           }
    01410
    01411           cost.AddCost(RailConvertCost(type, totype));
    01412           break;
    01413       }
    01414
    01415       for (uint i = 0; i < vehicles_affected.Length(); ++i) {
    01416         TryPathReserve(vehicles_affected[i], true);
    01417       }
    01418     }
    01419   }
    01420
    01421   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
    01422 }
    01423
    01424 static CommandCost RemoveTrainDepot(TileIndex tile, DoCommandFlag flags)
    01425 {
    01426   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER)
    01427     return CMD_ERROR;
    01428
    01429   if (!EnsureNoVehicleOnGround(tile))
    01430     return CMD_ERROR;
    01431
    01432   if (flags & DC_EXEC) {
    01433     /* read variables before the depot is removed */
    01434     DiagDirection dir = GetRailDepotDirection(tile);
    01435     Owner owner = GetTileOwner(tile);
    01436     Vehicle *v = NULL;
    01437
    01438     if (GetDepotWaypointReservation(tile)) {
    01439       v = GetTrainForReservation(tile, DiagDirToDiagTrack(dir));
    01440       if (v != NULL) FreeTrainTrackReservation(v);
    01441     }
    01442
    01443     DoClearSquare(tile);
    01444     delete GetDepotByTile(tile);
    01445     AddSideToSignalBuffer(tile, dir, owner);
    01446     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
    01447     if (v != NULL) TryPathReserve(v, true);
    01448   }
    01449
    01450   return CommandCost(EXPENSES_CONSTRUCTION, _price.remove_train_depot);
    01451 }
    01452
    01453 static CommandCost ClearTile_Track(TileIndex tile, DoCommandFlag flags)
    01454 {
    01455   CommandCost cost(EXPENSES_CONSTRUCTION);
    01456   CommandCost ret;
    01457
    01458   if (flags & DC_AUTO) {
    01459     if (!IsTileOwner(tile, _current_company))
    01460       return_cmd_error(STR_1024_AREA_IS_OWNED_BY_ANOTHER);
    01461
    01462     if (IsPlainRailTile(tile)) {
    01463       return_cmd_error(STR_1008_MUST_REMOVE_RAILROAD_TRACK);
    01464     } else {
    01465       return_cmd_error(STR_2004_BUILDING_MUST_BE_DEMOLISHED);
    01466     }
    01467   }
    01468
    01469   switch (GetRailTileType(tile)) {
    01470     case RAIL_TILE_SIGNALS:
    01471     case RAIL_TILE_NORMAL: {
    01472       Slope tileh = GetTileSlope(tile, NULL);
    01473       /* Is there flat water on the lower halftile, that gets cleared expensively? */
    01474       bool water_ground = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh));
    01475
    01476       TrackBits tracks = GetTrackBits(tile);
    01477       while (tracks != TRACK_BIT_NONE) {
    01478         Track track = RemoveFirstTrack(&tracks);
    01479         ret = DoCommand(tile, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
    01480         if (CmdFailed(ret)) return CMD_ERROR;
    01481         cost.AddCost(ret);
    01482       }
    01483
    01484       /* when bankrupting, don't make water dirty, there could be a ship on lower halftile */
    01485       if (water_ground && !(flags & DC_BANKRUPT)) {
    01486         if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    01487
    01488         /* The track was removed, and left a coast tile. Now also clear the water. */
    01489         if (flags & DC_EXEC) DoClearSquare(tile);
    01490         cost.AddCost(_price.clear_water);
    01491       }
    01492
    01493       return cost;
    01494     }
    01495
    01496     case RAIL_TILE_DEPOT:
    01497       return RemoveTrainDepot(tile, flags);
    01498
    01499     case RAIL_TILE_WAYPOINT:
    01500       return RemoveTrainWaypoint(tile, flags, false);
    01501
    01502     default:
    01503       return CMD_ERROR;
    01504   }
    01505 }
    01506
    01511 static uint GetSaveSlopeZ(uint x, uint y, Track track)
    01512 {
    01513   switch (track) {
    01514     case TRACK_UPPER: x &= ~0xF; y &= ~0xF; break;
    01515     case TRACK_LOWER: x |=  0xF; y |=  0xF; break;
    01516     case TRACK_LEFT:  x |=  0xF; y &= ~0xF; break;
    01517     case TRACK_RIGHT: x &= ~0xF; y |=  0xF; break;
    01518     default: break;
    01519   }
    01520   return GetSlopeZ(x, y);
    01521 }
    01522
    01523 static void DrawSingleSignal(TileIndex tile, Track track, byte condition, uint image, uint pos)
    01524 {
    01525   bool side = (_settings_game.vehicle.road_side != 0) && _settings_game.construction.signal_side;
    01526   static const Point SignalPositions[2][12] = {
    01527     { // Signals on the left side
    01528     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01529       { 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
    01530     /*  LOWER     LOWER     X         X         Y         Y     */
    01531       {11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
    01532     }, { // Signals on the right side
    01533     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01534       {14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
    01535     /*  LOWER     LOWER     X         X         Y         Y     */
    01536       {14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
    01537     }
    01538   };
    01539
    01540   uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
    01541   uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
    01542
    01543   SpriteID sprite;
    01544
    01545   SignalType type       = GetSignalType(tile, track);
    01546   SignalVariant variant = GetSignalVariant(tile, track);
    01547
    01548   if (type == SIGTYPE_NORMAL && variant == SIG_ELECTRIC) {
    01549     /* Normal electric signals are picked from original sprites. */
    01550     sprite = SPR_ORIGINAL_SIGNALS_BASE + image + condition;
    01551   } else {
    01552     /* All other signals are picked from add on sprites. */
    01553     sprite = SPR_SIGNALS_BASE + (type - 1) * 16 + variant * 64 + image + condition + (type > SIGTYPE_LAST_NOPBS ? 64 : 0);
    01554   }
    01555
    01556   AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, GetSaveSlopeZ(x, y, track));
    01557 }
    01558
    01559 static uint32 _drawtile_track_palette;
    01560
    01561
    01562 static void DrawTrackFence_NW(const TileInfo *ti, SpriteID base_image)
    01563 {
    01564   RailFenceOffset rfo = RFO_FLAT_X;
    01565   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
    01566   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01567     ti->x, ti->y + 1, 16, 1, 4, ti->z);
    01568 }
    01569
    01570 static void DrawTrackFence_SE(const TileInfo *ti, SpriteID base_image)
    01571 {
    01572   RailFenceOffset rfo = RFO_FLAT_X;
    01573   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
    01574   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01575     ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
    01576 }
    01577
    01578 static void DrawTrackFence_NW_SE(const TileInfo *ti, SpriteID base_image)
    01579 {
    01580   DrawTrackFence_NW(ti, base_image);
    01581   DrawTrackFence_SE(ti, base_image);
    01582 }
    01583
    01584 static void DrawTrackFence_NE(const TileInfo *ti, SpriteID base_image)
    01585 {
    01586   RailFenceOffset rfo = RFO_FLAT_Y;
    01587   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
    01588   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01589     ti->x + 1, ti->y, 1, 16, 4, ti->z);
    01590 }
    01591
    01592 static void DrawTrackFence_SW(const TileInfo *ti, SpriteID base_image)
    01593 {
    01594   RailFenceOffset rfo = RFO_FLAT_Y;
    01595   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
    01596   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01597     ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
    01598 }
    01599
    01600 static void DrawTrackFence_NE_SW(const TileInfo *ti, SpriteID base_image)
    01601 {
    01602   DrawTrackFence_NE(ti, base_image);
    01603   DrawTrackFence_SW(ti, base_image);
    01604 }
    01605
    01609 static void DrawTrackFence_NS_1(const TileInfo *ti, SpriteID base_image)
    01610 {
    01611   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_W);
    01612   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
    01613     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01614 }
    01615
    01619 static void DrawTrackFence_NS_2(const TileInfo *ti, SpriteID base_image)
    01620 {
    01621   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_E);
    01622   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
    01623     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01624 }
    01625
    01629 static void DrawTrackFence_WE_1(const TileInfo *ti, SpriteID base_image)
    01630 {
    01631   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_N);
    01632   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
    01633     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01634 }
    01635
    01639 static void DrawTrackFence_WE_2(const TileInfo *ti, SpriteID base_image)
    01640 {
    01641   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_S);
    01642   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
    01643     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01644 }
    01645
    01646
    01647 static void DrawTrackDetails(const TileInfo *ti)
    01648 {
    01649   /* Base sprite for track fences. */
    01650   SpriteID base_image = SPR_TRACK_FENCE_FLAT_X;
    01651
    01652   switch (GetRailGroundType(ti->tile)) {
    01653     case RAIL_GROUND_FENCE_NW:     DrawTrackFence_NW(ti, base_image);    break;
    01654     case RAIL_GROUND_FENCE_SE:     DrawTrackFence_SE(ti, base_image);    break;
    01655     case RAIL_GROUND_FENCE_SENW:   DrawTrackFence_NW_SE(ti, base_image); break;
    01656     case RAIL_GROUND_FENCE_NE:     DrawTrackFence_NE(ti, base_image);    break;
    01657     case RAIL_GROUND_FENCE_SW:     DrawTrackFence_SW(ti, base_image);    break;
    01658     case RAIL_GROUND_FENCE_NESW:   DrawTrackFence_NE_SW(ti, base_image); break;
    01659     case RAIL_GROUND_FENCE_VERT1:  DrawTrackFence_NS_1(ti, base_image);  break;
    01660     case RAIL_GROUND_FENCE_VERT2:  DrawTrackFence_NS_2(ti, base_image);  break;
    01661     case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti, base_image);  break;
    01662     case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti, base_image);  break;
    01663     case RAIL_GROUND_WATER: {
    01664       Corner track_corner;
    01665       if (IsHalftileSlope(ti->tileh)) {
    01666         /* Steep slope or one-corner-raised slope with halftile foundation */
    01667         track_corner = GetHalftileSlopeCorner(ti->tileh);
    01668       } else {
    01669         /* Three-corner-raised slope */
    01670         track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    01671       }
    01672       switch (track_corner) {
    01673         case CORNER_W: DrawTrackFence_NS_1(ti, base_image); break;
    01674         case CORNER_S: DrawTrackFence_WE_2(ti, base_image); break;
    01675         case CORNER_E: DrawTrackFence_NS_2(ti, base_image); break;
    01676         case CORNER_N: DrawTrackFence_WE_1(ti, base_image); break;
    01677         default: NOT_REACHED();
    01678       }
    01679       break;
    01680     }
    01681     default: break;
    01682   }
    01683 }
    01684
    01685
    01691 static void DrawTrackBits(TileInfo *ti, TrackBits track)
    01692 {
    01693   /* SubSprite for drawing the track halftile of 'three-corners-raised'-sloped rail sprites. */
    01694   static const int INF = 1000; // big number compared to tilesprite size
    01695   static const SubSprite _halftile_sub_sprite[4] = {
    01696     { -INF    , -INF  , 32 - 33, INF     }, // CORNER_W, clip 33 pixels from right
    01697     { -INF    ,  0 + 7, INF    , INF     }, // CORNER_S, clip 7 pixels from top
    01698     { -31 + 33, -INF  , INF    , INF     }, // CORNER_E, clip 33 pixels from left
    01699     { -INF    , -INF  , INF    , 30 - 23 }  // CORNER_N, clip 23 pixels from bottom
    01700   };
    01701
    01702   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    01703   RailGroundType rgt = GetRailGroundType(ti->tile);
    01704   Foundation f = GetRailFoundation(ti->tileh, track);
    01705   Corner halftile_corner = CORNER_INVALID;
    01706
    01707   if (IsNonContinuousFoundation(f)) {
    01708     /* Save halftile corner */
    01709     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
    01710     /* Draw lower part first */
    01711     track &= ~CornerToTrackBits(halftile_corner);
    01712     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
    01713   }
    01714
    01715   DrawFoundation(ti, f);
    01716   /* DrawFoundation modifies ti */
    01717
    01718   SpriteID image;
    01719   SpriteID pal = PAL_NONE;
    01720   const SubSprite *sub = NULL;
    01721   bool junction = false;
    01722
    01723   /* Select the sprite to use. */
    01724   if (track == 0) {
    01725     /* Clear ground (only track on halftile foundation) */
    01726     if (rgt == RAIL_GROUND_WATER) {
    01727       if (IsSteepSlope(ti->tileh)) {
    01728         DrawShoreTile(ti->tileh);
    01729         image = 0;
    01730       } else {
    01731         image = SPR_FLAT_WATER_TILE;
    01732       }
    01733     } else {
    01734       switch (rgt) {
    01735         case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01736         case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOWY_TILE; break;
    01737         default:                     image = SPR_FLAT_GRASS_TILE; break;
    01738       }
    01739       image += _tileh_to_sprite[ti->tileh];
    01740     }
    01741   } else {
    01742     if (ti->tileh != SLOPE_FLAT) {
    01743       /* track on non-flat ground */
    01744       image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
    01745     } else {
    01746       /* track on flat ground */
    01747       (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
    01748       (image++,                           track == TRACK_BIT_X) ||
    01749       (image++,                           track == TRACK_BIT_UPPER) ||
    01750       (image++,                           track == TRACK_BIT_LOWER) ||
    01751       (image++,                           track == TRACK_BIT_RIGHT) ||
    01752       (image++,                           track == TRACK_BIT_LEFT) ||
    01753       (image++,                           track == TRACK_BIT_CROSS) ||
    01754
    01755       (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
    01756       (image++,                            track == TRACK_BIT_VERT) ||
    01757
    01758       (junction = true, false) ||
    01759       (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
    01760       (image++,                          (track & TRACK_BIT_3WAY_SW) == 0) ||
    01761       (image++,                          (track & TRACK_BIT_3WAY_NW) == 0) ||
    01762       (image++,                          (track & TRACK_BIT_3WAY_SE) == 0) ||
    01763       (image++, true);
    01764     }
    01765
    01766     switch (rgt) {
    01767       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    01768       case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset;  break;
    01769       case RAIL_GROUND_WATER: {
    01770         /* three-corner-raised slope */
    01771         DrawShoreTile(ti->tileh);
    01772         Corner track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    01773         sub = &(_halftile_sub_sprite[track_corner]);
    01774         break;
    01775       }
    01776       default: break;
    01777     }
    01778   }
    01779
    01780   if (image != 0) DrawGroundSprite(image, pal, sub);
    01781
    01782   /* Draw track pieces individually for junction tiles */
    01783   if (junction) {
    01784     if (track & TRACK_BIT_X)     DrawGroundSprite(rti->base_sprites.single_y, PAL_NONE);
    01785     if (track & TRACK_BIT_Y)     DrawGroundSprite(rti->base_sprites.single_x, PAL_NONE);
    01786     if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PAL_NONE);
    01787     if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PAL_NONE);
    01788     if (track & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PAL_NONE);
    01789     if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PAL_NONE);
    01790   }
    01791
    01792   /* PBS debugging, draw reserved tracks darker */
    01793   if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation) {
    01794     TrackBits pbs = GetTrackReservation(ti->tile);
    01795     if (pbs & TRACK_BIT_X) {
    01796       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
    01797         DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH);
    01798       } else {
    01799         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
    01800       }
    01801     }
    01802     if (pbs & TRACK_BIT_Y) {
    01803       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
    01804         DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH);
    01805       } else {
    01806         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
    01807       }
    01808     }
    01809     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));
    01810     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));
    01811     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));
    01812     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));
    01813   }
    01814
    01815   if (IsValidCorner(halftile_corner)) {
    01816     DrawFoundation(ti, HalftileFoundation(halftile_corner));
    01817
    01818     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
    01819     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    01820     image = _track_sloped_sprites[fake_slope - 1] + rti->base_sprites.track_y;
    01821     pal = PAL_NONE;
    01822     switch (rgt) {
    01823       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    01824       case RAIL_GROUND_ICE_DESERT:
    01825       case RAIL_GROUND_HALF_SNOW:  image += rti->snow_offset;  break; // higher part has snow in this case too
    01826       default: break;
    01827     }
    01828     DrawGroundSprite(image, pal, &(_halftile_sub_sprite[halftile_corner]));
    01829
    01830     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && IsSteepSlope(ti->tileh) && HasReservedTracks(ti->tile, CornerToTrackBits(halftile_corner))) {
    01831       static const byte _corner_to_track_sprite[] = {3, 1, 2, 0};
    01832       AddSortableSpriteToDraw(_corner_to_track_sprite[halftile_corner] + rti->base_sprites.single_n, PALETTE_CRASH, ti->x, ti->y, 16, 16, 0, ti->z + 16);
    01833     }
    01834   }
    01835 }
    01836
    01842 enum {
    01843   SIGNAL_TO_SOUTHWEST =  0,
    01844   SIGNAL_TO_NORTHEAST =  2,
    01845   SIGNAL_TO_SOUTHEAST =  4,
    01846   SIGNAL_TO_NORTHWEST =  6,
    01847   SIGNAL_TO_EAST      =  8,
    01848   SIGNAL_TO_WEST      = 10,
    01849   SIGNAL_TO_SOUTH     = 12,
    01850   SIGNAL_TO_NORTH     = 14,
    01851 };
    01852
    01853 static void DrawSignals(TileIndex tile, TrackBits rails)
    01854 {
    01855 #define MAYBE_DRAW_SIGNAL(x,y,z,t) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, t, GetSingleSignalState(tile, x), y, z)
    01856
    01857   if (!(rails & TRACK_BIT_Y)) {
    01858     if (!(rails & TRACK_BIT_X)) {
    01859       if (rails & TRACK_BIT_LEFT) {
    01860         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTH, 0, TRACK_LEFT);
    01861         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTH, 1, TRACK_LEFT);
    01862       }
    01863       if (rails & TRACK_BIT_RIGHT) {
    01864         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_NORTH, 2, TRACK_RIGHT);
    01865         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_SOUTH, 3, TRACK_RIGHT);
    01866       }
    01867       if (rails & TRACK_BIT_UPPER) {
    01868         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_WEST, 4, TRACK_UPPER);
    01869         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_EAST, 5, TRACK_UPPER);
    01870       }
    01871       if (rails & TRACK_BIT_LOWER) {
    01872         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_WEST, 6, TRACK_LOWER);
    01873         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_EAST, 7, TRACK_LOWER);
    01874       }
    01875     } else {
    01876       MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHWEST, 8, TRACK_X);
    01877       MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHEAST, 9, TRACK_X);
    01878     }
    01879   } else {
    01880     MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHEAST, 10, TRACK_Y);
    01881     MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHWEST, 11, TRACK_Y);
    01882   }
    01883 }
    01884
    01885 static void DrawTile_Track(TileInfo *ti)
    01886 {
    01887   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    01888   SpriteID image;
    01889
    01890   _drawtile_track_palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
    01891
    01892   if (IsPlainRailTile(ti->tile)) {
    01893     TrackBits rails = GetTrackBits(ti->tile);
    01894
    01895     DrawTrackBits(ti, rails);
    01896
    01897     if (HasBit(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti);
    01898
    01899     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    01900
    01901     if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
    01902   } else {
    01903     /* draw depot/waypoint */
    01904     const DrawTileSprites *dts;
    01905     const DrawTileSeqStruct *dtss;
    01906     uint32 relocation;
    01907     SpriteID pal = PAL_NONE;
    01908
    01909     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
    01910
    01911     if (IsRailDepot(ti->tile)) {
    01912       if (IsInvisibilitySet(TO_BUILDINGS)) {
    01913         /* Draw rail instead of depot */
    01914         dts = &_depot_invisible_gfx_table[GetRailDepotDirection(ti->tile)];
    01915       } else {
    01916         dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
    01917       }
    01918
    01919       relocation = rti->total_offset;
    01920
    01921       image = dts->ground.sprite;
    01922       if (image != SPR_FLAT_GRASS_TILE) image += rti->total_offset;
    01923
    01924       /* adjust ground tile for desert
    01925        * don't adjust for snow, because snow in depots looks weird */
    01926       if (IsSnowRailGround(ti->tile) && _settings_game.game_creation.landscape == LT_TROPIC) {
    01927         if (image != SPR_FLAT_GRASS_TILE) {
    01928           image += rti->snow_offset; // tile with tracks
    01929         } else {
    01930           image = SPR_FLAT_SNOWY_TILE; // flat ground
    01931         }
    01932       }
    01933     } else {
    01934       /* look for customization */
    01935       byte stat_id = GetWaypointByTile(ti->tile)->stat_id;
    01936       const StationSpec *statspec = GetCustomStationSpec(STAT_CLASS_WAYP, stat_id);
    01937
    01938       if (statspec != NULL) {
    01939         /* emulate station tile - open with building */
    01940         const Station *st = ComposeWaypointStation(ti->tile);
    01941         uint gfx = 2;
    01942
    01943         if (HasBit(statspec->callbackmask, CBM_STATION_SPRITE_LAYOUT)) {
    01944           uint16 callback = GetStationCallback(CBID_STATION_SPRITE_LAYOUT, 0, 0, statspec, st, ti->tile);
    01945           if (callback != CALLBACK_FAILED) gfx = callback;
    01946         }
    01947
    01948         if (statspec->renderdata == NULL) {
    01949           dts = GetStationTileLayout(STATION_RAIL, gfx);
    01950         } else {
    01951           dts = &statspec->renderdata[(gfx < statspec->tiles ? gfx : 0) + GetWaypointAxis(ti->tile)];
    01952         }
    01953
    01954         if (dts != NULL && dts->seq != NULL) {
    01955           relocation = GetCustomStationRelocation(statspec, st, ti->tile);
    01956
    01957           image = dts->ground.sprite;
    01958           if (HasBit(image, SPRITE_MODIFIER_USE_OFFSET)) {
    01959             image += GetCustomStationGroundRelocation(statspec, st, ti->tile);
    01960             image += rti->custom_ground_offset;
    01961           } else {
    01962             image += rti->total_offset;
    01963           }
    01964
    01965           pal = dts->ground.pal;
    01966         } else {
    01967           goto default_waypoint;
    01968         }
    01969       } else {
    01970 default_waypoint:
    01971         /* There is no custom layout, fall back to the default graphics */
    01972         dts = &_waypoint_gfx_table[GetWaypointAxis(ti->tile)];
    01973         relocation = 0;
    01974         image = dts->ground.sprite + rti->total_offset;
    01975         if (IsSnowRailGround(ti->tile)) image += rti->snow_offset;
    01976       }
    01977     }
    01978
    01979     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, _drawtile_track_palette));
    01980
    01981     /* PBS debugging, draw reserved tracks darker */
    01982     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && GetDepotWaypointReservation(ti->tile) &&
    01983         (!IsRailDepot(ti->tile) || GetRailDepotDirection(ti->tile) == DIAGDIR_SW || GetRailDepotDirection(ti->tile) == DIAGDIR_SE)) {
    01984       DrawGroundSprite(GetWaypointAxis(ti->tile) == AXIS_X ? rti->base_sprites.single_y : rti->base_sprites.single_x, PALETTE_CRASH);
    01985     }
    01986
    01987     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    01988
    01989     foreach_draw_tile_seq(dtss, dts->seq) {
    01990       SpriteID image = dtss->image.sprite;
    01991       SpriteID pal   = dtss->image.pal;
    01992
    01993       /* Stop drawing sprite sequence once we meet a sprite that doesn't have to be opaque */
    01994       if (IsInvisibilitySet(TO_BUILDINGS) && !HasBit(image, SPRITE_MODIFIER_OPAQUE)) return;
    01995
    01996       /* Unlike stations, our default waypoint has no variation for
    01997        * different railtype, so don't use the railtype offset if
    01998        * no relocation is set */
    01999       if (HasBit(image, SPRITE_MODIFIER_USE_OFFSET)) {
    02000         image += rti->total_offset;
    02001       } else {
    02002         image += relocation;
    02003       }
    02004
    02005       pal = SpriteLayoutPaletteTransform(image, pal, _drawtile_track_palette);
    02006
    02007       if ((byte)dtss->delta_z != 0x80) {
    02008         AddSortableSpriteToDraw(
    02009           image, pal,
    02010           ti->x + dtss->delta_x, ti->y + dtss->delta_y,
    02011           dtss->size_x, dtss->size_y,
    02012           dtss->size_z, ti->z + dtss->delta_z,
    02013           !HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(TO_BUILDINGS)
    02014         );
    02015       } else {
    02016         /* For stations and original spritelayouts delta_x and delta_y are signed */
    02017         AddChildSpriteScreen(image, pal, dtss->delta_x, dtss->delta_y, !HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(TO_BUILDINGS));
    02018       }
    02019     }
    02020   }
    02021   DrawBridgeMiddle(ti);
    02022 }
    02023
    02024
    02025 static void DrawTileSequence(int x, int y, SpriteID ground, const DrawTileSeqStruct *dtss, uint32 offset)
    02026 {
    02027   SpriteID palette = COMPANY_SPRITE_COLOUR(_local_company);
    02028
    02029   DrawSprite(ground, PAL_NONE, x, y);
    02030   for (; dtss->image.sprite != 0; dtss++) {
    02031     Point pt = RemapCoords(dtss->delta_x, dtss->delta_y, dtss->delta_z);
    02032     SpriteID image = dtss->image.sprite + offset;
    02033
    02034     DrawSprite(image, HasBit(image, PALETTE_MODIFIER_COLOUR) ? palette : PAL_NONE, x + pt.x, y + pt.y);
    02035   }
    02036 }
    02037
    02038 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
    02039 {
    02040   const DrawTileSprites *dts = &_depot_gfx_table[dir];
    02041   SpriteID image = dts->ground.sprite;
    02042   uint32 offset = GetRailTypeInfo(railtype)->total_offset;
    02043
    02044   if (image != SPR_FLAT_GRASS_TILE) image += offset;
    02045   DrawTileSequence(x + 33, y + 17, image, dts->seq, offset);
    02046 }
    02047
    02048 void DrawDefaultWaypointSprite(int x, int y, RailType railtype)
    02049 {
    02050   uint32 offset = GetRailTypeInfo(railtype)->total_offset;
    02051   const DrawTileSprites *dts = &_waypoint_gfx_table[AXIS_X];
    02052
    02053   DrawTileSequence(x, y, dts->ground.sprite + offset, dts->seq, 0);
    02054 }
    02055
    02056 static uint GetSlopeZ_Track(TileIndex tile, uint x, uint y)
    02057 {
    02058   uint z;
    02059   Slope tileh = GetTileSlope(tile, &z);
    02060
    02061   if (tileh == SLOPE_FLAT) return z;
    02062   if (IsPlainRailTile(tile)) {
    02063     z += ApplyFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
    02064     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
    02065   } else {
    02066     return z + TILE_HEIGHT;
    02067   }
    02068 }
    02069
    02070 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
    02071 {
    02072   return IsPlainRailTile(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
    02073 }
    02074
    02075 static void GetAcceptedCargo_Track(TileIndex tile, AcceptedCargo ac)
    02076 {
    02077   /* not used */
    02078 }
    02079
    02080 static void AnimateTile_Track(TileIndex tile)
    02081 {
    02082   /* not used */
    02083 }
    02084
    02085 static void TileLoop_Track(TileIndex tile)
    02086 {
    02087   RailGroundType old_ground = GetRailGroundType(tile);
    02088   RailGroundType new_ground;
    02089
    02090   if (old_ground == RAIL_GROUND_WATER) {
    02091     TileLoop_Water(tile);
    02092     return;
    02093   }
    02094
    02095   switch (_settings_game.game_creation.landscape) {
    02096     case LT_ARCTIC: {
    02097       uint z;
    02098       Slope slope = GetTileSlope(tile, &z);
    02099       bool half = false;
    02100
    02101       /* for non-flat track, use lower part of track
    02102        * in other cases, use the highest part with track */
    02103       if (IsPlainRailTile(tile)) {
    02104         TrackBits track = GetTrackBits(tile);
    02105         Foundation f = GetRailFoundation(slope, track);
    02106
    02107         switch (f) {
    02108           case FOUNDATION_NONE:
    02109             /* no foundation - is the track on the upper side of three corners raised tile? */
    02110             if (IsSlopeWithThreeCornersRaised(slope)) z += TILE_HEIGHT;
    02111             break;
    02112
    02113           case FOUNDATION_INCLINED_X:
    02114           case FOUNDATION_INCLINED_Y:
    02115             /* sloped track - is it on a steep slope? */
    02116             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    02117             break;
    02118
    02119           case FOUNDATION_STEEP_LOWER:
    02120             /* only lower part of steep slope */
    02121             z += TILE_HEIGHT;
    02122             break;
    02123
    02124           default:
    02125             /* if it is a steep slope, then there is a track on higher part */
    02126             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    02127             z += TILE_HEIGHT;
    02128             break;
    02129         }
    02130
    02131         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
    02132       } else {
    02133         /* is the depot on a non-flat tile? */
    02134         if (slope != SLOPE_FLAT) z += TILE_HEIGHT;
    02135       }
    02136
    02137       /* 'z' is now the lowest part of the highest track bit -
    02138        * for sloped track, it is 'z' of lower part
    02139        * for two track bits, it is 'z' of higher track bit
    02140        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
    02141       if (z > GetSnowLine()) {
    02142         if (half && z - GetSnowLine() == TILE_HEIGHT) {
    02143           /* track on non-continuous foundation, lower part is not under snow */
    02144           new_ground = RAIL_GROUND_HALF_SNOW;
    02145         } else {
    02146           new_ground = RAIL_GROUND_ICE_DESERT;
    02147         }
    02148         goto set_ground;
    02149       }
    02150       break;
    02151       }
    02152
    02153     case LT_TROPIC:
    02154       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
    02155         new_ground = RAIL_GROUND_ICE_DESERT;
    02156         goto set_ground;
    02157       }
    02158       break;
    02159   }
    02160
    02161   if (!IsPlainRailTile(tile)) return;
    02162
    02163   new_ground = RAIL_GROUND_GRASS;
    02164
    02165   if (old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
    02166     /* determine direction of fence */
    02167     TrackBits rail = GetTrackBits(tile);
    02168
    02169     switch (rail) {
    02170       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
    02171       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
    02172       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
    02173       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
    02174
    02175       default: {
    02176         Owner owner = GetTileOwner(tile);
    02177
    02178         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
    02179               (rail & TRACK_BIT_3WAY_NW) == 0 &&
    02180               (rail & TRACK_BIT_X)
    02181             )) {
    02182           TileIndex n = tile + TileDiffXY(0, -1);
    02183           TrackBits nrail = (IsTileType(n, MP_RAILWAY) && IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02184
    02185           if (!IsTileType(n, MP_RAILWAY) ||
    02186               !IsTileOwner(n, owner) ||
    02187               nrail == TRACK_BIT_UPPER ||
    02188               nrail == TRACK_BIT_LEFT) {
    02189             new_ground = RAIL_GROUND_FENCE_NW;
    02190           }
    02191         }
    02192
    02193         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
    02194               (rail & TRACK_BIT_3WAY_SE) == 0 &&
    02195               (rail & TRACK_BIT_X)
    02196             )) {
    02197           TileIndex n = tile + TileDiffXY(0, 1);
    02198           TrackBits nrail = (IsTileType(n, MP_RAILWAY) && IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02199
    02200           if (!IsTileType(n, MP_RAILWAY) ||
    02201               !IsTileOwner(n, owner) ||
    02202               nrail == TRACK_BIT_LOWER ||
    02203               nrail == TRACK_BIT_RIGHT) {
    02204             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
    02205               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
    02206           }
    02207         }
    02208
    02209         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
    02210               (rail & TRACK_BIT_3WAY_NE) == 0 &&
    02211               (rail & TRACK_BIT_Y)
    02212             )) {
    02213           TileIndex n = tile + TileDiffXY(-1, 0);
    02214           TrackBits nrail = (IsTileType(n, MP_RAILWAY) && IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02215
    02216           if (!IsTileType(n, MP_RAILWAY) ||
    02217               !IsTileOwner(n, owner) ||
    02218               nrail == TRACK_BIT_UPPER ||
    02219               nrail == TRACK_BIT_RIGHT) {
    02220             new_ground = RAIL_GROUND_FENCE_NE;
    02221           }
    02222         }
    02223
    02224         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
    02225               (rail & TRACK_BIT_3WAY_SW) == 0 &&
    02226               (rail & TRACK_BIT_Y)
    02227             )) {
    02228           TileIndex n = tile + TileDiffXY(1, 0);
    02229           TrackBits nrail = (IsTileType(n, MP_RAILWAY) && IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02230
    02231           if (!IsTileType(n, MP_RAILWAY) ||
    02232               !IsTileOwner(n, owner) ||
    02233               nrail == TRACK_BIT_LOWER ||
    02234               nrail == TRACK_BIT_LEFT) {
    02235             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
    02236               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
    02237           }
    02238         }
    02239         break;
    02240       }
    02241     }
    02242   }
    02243
    02244 set_ground:
    02245   if (old_ground != new_ground) {
    02246     SetRailGroundType(tile, new_ground);
    02247     MarkTileDirtyByTile(tile);
    02248   }
    02249 }
    02250
    02251
    02252 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
    02253 {
    02254   /* Case of half tile slope with water. */
    02255   if (mode == TRANSPORT_WATER && IsPlainRailTile(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
    02256     TrackBits tb = GetTrackBits(tile);
    02257     switch (tb) {
    02258       default: NOT_REACHED();
    02259       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
    02260       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
    02261       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
    02262       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
    02263     }
    02264     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
    02265   }
    02266
    02267   if (mode != TRANSPORT_RAIL) return 0;
    02268
    02269   TrackBits trackbits = TRACK_BIT_NONE;
    02270   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
    02271
    02272   switch (GetRailTileType(tile)) {
    02273     default: NOT_REACHED();
    02274     case RAIL_TILE_NORMAL:
    02275       trackbits = GetTrackBits(tile);
    02276       break;
    02277
    02278     case RAIL_TILE_SIGNALS: {
    02279       trackbits = GetTrackBits(tile);
    02280       byte a = GetPresentSignals(tile);
    02281       uint b = GetSignalStates(tile);
    02282
    02283       b &= a;
    02284
    02285       /* When signals are not present (in neither direction),
    02286        * we pretend them to be green. Otherwise, it depends on
    02287        * the signal type. For signals that are only active from
    02288        * one side, we set the missing signals explicitely to
    02289        * `green'. Otherwise, they implicitely become `red'. */
    02290       if (!IsOnewaySignal(tile, TRACK_UPPER) || (a & SignalOnTrack(TRACK_UPPER)) == 0) b |= ~a & SignalOnTrack(TRACK_UPPER);
    02291       if (!IsOnewaySignal(tile, TRACK_LOWER) || (a & SignalOnTrack(TRACK_LOWER)) == 0) b |= ~a & SignalOnTrack(TRACK_LOWER);
    02292
    02293       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
    02294       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
    02295       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
    02296       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
    02297
    02298       break;
    02299     }
    02300
    02301     case RAIL_TILE_DEPOT: {
    02302       DiagDirection dir = GetRailDepotDirection(tile);
    02303
    02304       if (side != INVALID_DIAGDIR && side != dir) break;
    02305
    02306       trackbits = DiagDirToDiagTrackBits(dir);
    02307       break;
    02308     }
    02309
    02310     case RAIL_TILE_WAYPOINT:
    02311       trackbits = GetRailWaypointBits(tile);
    02312       break;
    02313   }
    02314
    02315   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
    02316 }
    02317
    02318 static bool ClickTile_Track(TileIndex tile)
    02319 {
    02320   switch (GetRailTileType(tile)) {
    02321     case RAIL_TILE_DEPOT:    ShowDepotWindow(tile, VEH_TRAIN);            return true;
    02322     case RAIL_TILE_WAYPOINT: ShowWaypointWindow(GetWaypointByTile(tile)); return true;
    02323     default: return false;
    02324   }
    02325 }
    02326
    02327 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
    02328 {
    02329   td->owner[0] = GetTileOwner(tile);
    02330   switch (GetRailTileType(tile)) {
    02331     case RAIL_TILE_NORMAL:
    02332       td->str = STR_1021_RAILROAD_TRACK;
    02333       break;
    02334
    02335     case RAIL_TILE_SIGNALS: {
    02336       const StringID signal_type[6][6] = {
    02337         {
    02338           STR_RAILROAD_TRACK_WITH_NORMAL_SIGNALS,
    02339           STR_RAILROAD_TRACK_WITH_NORMAL_PRESIGNALS,
    02340           STR_RAILROAD_TRACK_WITH_NORMAL_EXITSIGNALS,
    02341           STR_RAILROAD_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02342           STR_RAILROAD_TRACK_WITH_NORMAL_PBSSIGNALS,
    02343           STR_RAILROAD_TRACK_WITH_NORMAL_NOENTRYSIGNALS
    02344         },
    02345         {
    02346           STR_RAILROAD_TRACK_WITH_NORMAL_PRESIGNALS,
    02347           STR_RAILROAD_TRACK_WITH_PRESIGNALS,
    02348           STR_RAILROAD_TRACK_WITH_PRE_EXITSIGNALS,
    02349           STR_RAILROAD_TRACK_WITH_PRE_COMBOSIGNALS,
    02350           STR_RAILROAD_TRACK_WITH_PRE_PBSSIGNALS,
    02351           STR_RAILROAD_TRACK_WITH_PRE_NOENTRYSIGNALS
    02352         },
    02353         {
    02354           STR_RAILROAD_TRACK_WITH_NORMAL_EXITSIGNALS,
    02355           STR_RAILROAD_TRACK_WITH_PRE_EXITSIGNALS,
    02356           STR_RAILROAD_TRACK_WITH_EXITSIGNALS,
    02357           STR_RAILROAD_TRACK_WITH_EXIT_COMBOSIGNALS,
    02358           STR_RAILROAD_TRACK_WITH_EXIT_PBSSIGNALS,
    02359           STR_RAILROAD_TRACK_WITH_EXIT_NOENTRYSIGNALS
    02360         },
    02361         {
    02362           STR_RAILROAD_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02363           STR_RAILROAD_TRACK_WITH_PRE_COMBOSIGNALS,
    02364           STR_RAILROAD_TRACK_WITH_EXIT_COMBOSIGNALS,
    02365           STR_RAILROAD_TRACK_WITH_COMBOSIGNALS,
    02366           STR_RAILROAD_TRACK_WITH_COMBO_PBSSIGNALS,
    02367           STR_RAILROAD_TRACK_WITH_COMBO_NOENTRYSIGNALS
    02368         },
    02369         {
    02370           STR_RAILROAD_TRACK_WITH_NORMAL_PBSSIGNALS,
    02371           STR_RAILROAD_TRACK_WITH_PRE_PBSSIGNALS,
    02372           STR_RAILROAD_TRACK_WITH_EXIT_PBSSIGNALS,
    02373           STR_RAILROAD_TRACK_WITH_COMBO_PBSSIGNALS,
    02374           STR_RAILROAD_TRACK_WITH_PBSSIGNALS,
    02375           STR_RAILROAD_TRACK_WITH_PBS_NOENTRYSIGNALS
    02376         },
    02377         {
    02378           STR_RAILROAD_TRACK_WITH_NORMAL_NOENTRYSIGNALS,
    02379           STR_RAILROAD_TRACK_WITH_PRE_NOENTRYSIGNALS,
    02380           STR_RAILROAD_TRACK_WITH_EXIT_NOENTRYSIGNALS,
    02381           STR_RAILROAD_TRACK_WITH_COMBO_NOENTRYSIGNALS,
    02382           STR_RAILROAD_TRACK_WITH_PBS_NOENTRYSIGNALS,
    02383           STR_RAILROAD_TRACK_WITH_NOENTRYSIGNALS
    02384         }
    02385       };
    02386
    02387       SignalType primary_signal;
    02388       SignalType secondary_signal;
    02389       if (HasSignalOnTrack(tile, TRACK_UPPER)) {
    02390         primary_signal = GetSignalType(tile, TRACK_UPPER);
    02391         secondary_signal = HasSignalOnTrack(tile, TRACK_LOWER) ? GetSignalType(tile, TRACK_LOWER) : primary_signal;
    02392       } else {
    02393         secondary_signal = primary_signal = GetSignalType(tile, TRACK_LOWER);
    02394       }
    02395
    02396       td->str = signal_type[secondary_signal][primary_signal];
    02397       break;
    02398     }
    02399
    02400     case RAIL_TILE_DEPOT:
    02401       td->str = STR_1023_RAILROAD_TRAIN_DEPOT;
    02402       break;
    02403
    02404     case RAIL_TILE_WAYPOINT:
    02405     default:
    02406       td->str = STR_LANDINFO_WAYPOINT;
    02407       break;
    02408   }
    02409 }
    02410
    02411 static void ChangeTileOwner_Track(TileIndex tile, Owner old_owner, Owner new_owner)
    02412 {
    02413   if (!IsTileOwner(tile, old_owner)) return;
    02414
    02415   if (new_owner != INVALID_OWNER) {
    02416     SetTileOwner(tile, new_owner);
    02417   } else {
    02418     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
    02419   }
    02420 }
    02421
    02422 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
    02423 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
    02424 static const signed char _deltacoord_leaveoffset[8] = {
    02425   -1,  0,  1,  0, /* x */
    02426    0,  1,  0, -1  /* y */
    02427 };
    02428
    02429
    02435 int TicksToLeaveDepot(const Vehicle *v)
    02436 {
    02437   DiagDirection dir = GetRailDepotDirection(v->tile);
    02438   int length = v->u.rail.cached_veh_length;
    02439
    02440   switch (dir) {
    02441     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
    02442     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
    02443     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
    02444     default:
    02445     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
    02446   }
    02447
    02448   return 0; // make compilers happy
    02449 }
    02450
    02453 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *v, TileIndex tile, int x, int y)
    02454 {
    02455   byte fract_coord;
    02456   byte fract_coord_leave;
    02457   DiagDirection dir;
    02458   int length;
    02459
    02460   /* this routine applies only to trains in depot tiles */
    02461   if (v->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
    02462
    02463   /* depot direction */
    02464   dir = GetRailDepotDirection(tile);
    02465
    02466   /* calculate the point where the following wagon should be activated
    02467    * this depends on the length of the current vehicle */
    02468   length = v->u.rail.cached_veh_length;
    02469
    02470   fract_coord_leave =
    02471     ((_fractcoords_enter[dir] & 0x0F) + // x
    02472       (length + 1) * _deltacoord_leaveoffset[dir]) +
    02473     (((_fractcoords_enter[dir] >> 4) +  // y
    02474       ((length + 1) * _deltacoord_leaveoffset[dir+4])) << 4);
    02475
    02476   fract_coord = (x & 0xF) + ((y & 0xF) << 4);
    02477
    02478   if (_fractcoords_behind[dir] == fract_coord) {
    02479     /* make sure a train is not entering the tile from behind */
    02480     return VETSB_CANNOT_ENTER;
    02481   } else if (_fractcoords_enter[dir] == fract_coord) {
    02482     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
    02483       /* enter the depot */
    02484       v->u.rail.track = TRACK_BIT_DEPOT,
    02485       v->vehstatus |= VS_HIDDEN; // hide it
    02486       v->direction = ReverseDir(v->direction);
    02487       if (v->Next() == NULL) VehicleEnterDepot(v);
    02488       v->tile = tile;
    02489
    02490       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
    02491       return VETSB_ENTERED_WORMHOLE;
    02492     }
    02493   } else if (fract_coord_leave == fract_coord) {
    02494     if (DiagDirToDir(dir) == v->direction) {
    02495       /* leave the depot? */
    02496       if ((v = v->Next()) != NULL) {
    02497         v->vehstatus &= ~VS_HIDDEN;
    02498         v->u.rail.track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
    02499       }
    02500     }
    02501   }
    02502
    02503   return VETSB_CONTINUE;
    02504 }
    02505
    02517 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, uint z_old, Slope tileh_old, uint z_new, Slope tileh_new, TrackBits rail_bits)
    02518 {
    02519   if (!_settings_game.construction.build_on_slopes || !AutoslopeEnabled()) return CMD_ERROR;
    02520
    02521   /* Is the slope-rail_bits combination valid in general? I.e. is it safe to call GetRailFoundation() ? */
    02522   if (CmdFailed(CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile))) return CMD_ERROR;
    02523
    02524   /* Get the slopes on top of the foundations */
    02525   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
    02526   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
    02527
    02528   Corner track_corner;
    02529   switch (rail_bits) {
    02530     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
    02531     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
    02532     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
    02533     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
    02534
    02535     /* Surface slope must not be changed */
    02536     default: return (((z_old != z_new) || (tileh_old != tileh_new)) ? CMD_ERROR : CommandCost(EXPENSES_CONSTRUCTION, _price.terraform));
    02537   }
    02538
    02539   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
    02540   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
    02541   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
    02542   if (z_old != z_new) return CMD_ERROR;
    02543
    02544   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    02545   /* Make the ground dirty, if surface slope has changed */
    02546   if (tileh_old != tileh_new) {
    02547     /* If there is flat water on the lower halftile add the cost for clearing it */
    02548     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price.clear_water);
    02549     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02550   }
    02551   return  cost;
    02552 }
    02553
    02554 static CommandCost TerraformTile_Track(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
    02555 {
    02556   uint z_old;
    02557   Slope tileh_old = GetTileSlope(tile, &z_old);
    02558   if (IsPlainRailTile(tile)) {
    02559     TrackBits rail_bits = GetTrackBits(tile);
    02560     /* Is there flat water on the lower halftile, that must be cleared expensively? */
    02561     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
    02562
    02563     _error_message = STR_1008_MUST_REMOVE_RAILROAD_TRACK;
    02564
    02565     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
    02566     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
    02567
    02568     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
    02569     Corner allowed_corner;
    02570     switch (rail_bits) {
    02571       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
    02572       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
    02573       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
    02574       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
    02575       default: return autoslope_result;
    02576     }
    02577
    02578     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
    02579
    02580     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
    02581     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
    02582
    02583     /* Everything is valid, which only changes allowed_corner */
    02584     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
    02585       if (allowed_corner == corner) continue;
    02586       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
    02587     }
    02588
    02589     /* Make the ground dirty */
    02590     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02591
    02592     /* allow terraforming */
    02593     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price.clear_water : (Money)0);
    02594   } else {
    02595     if (_settings_game.construction.build_on_slopes && AutoslopeEnabled()) {
    02596       switch (GetRailTileType(tile)) {
    02597         case RAIL_TILE_WAYPOINT: {
    02598           CommandCost cost = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, GetRailWaypointBits(tile));
    02599           if (!CmdFailed(cost)) return cost; // allow autoslope
    02600           break;
    02601         }
    02602
    02603         case RAIL_TILE_DEPOT:
    02604           if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    02605           break;
    02606
    02607         default: NOT_REACHED();
    02608       }
    02609     }
    02610   }
    02611   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    02612 }
    02613
    02614
    02615 extern const TileTypeProcs _tile_type_rail_procs = {
    02616   DrawTile_Track,           // draw_tile_proc
    02617   GetSlopeZ_Track,          // get_slope_z_proc
    02618   ClearTile_Track,          // clear_tile_proc
    02619   GetAcceptedCargo_Track,   // get_accepted_cargo_proc
    02620   GetTileDesc_Track,        // get_tile_desc_proc
    02621   GetTileTrackStatus_Track, // get_tile_track_status_proc
    02622   ClickTile_Track,          // click_tile_proc
    02623   AnimateTile_Track,        // animate_tile_proc
    02624   TileLoop_Track,           // tile_loop_clear
    02625   ChangeTileOwner_Track,    // change_tile_owner_clear
    02626   NULL,                     // get_produced_cargo_proc
    02627   VehicleEnter_Track,       // vehicle_enter_tile_proc
    02628   GetFoundation_Track,      // get_foundation_proc
    02629   TerraformTile_Track,      // terraform_tile_proc
    02630 };