# rail_cmd.cpp

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    00001 /* $Id: rail_cmd.cpp 14385 2008-09-22 19:57:31Z rubidium $ */
    00002
    00005 #include "stdafx.h"
    00006 #include "openttd.h"
    00007 #include "bridge_map.h"
    00008 #include "bridge.h"
    00009 #include "cmd_helper.h"
    00010 #include "debug.h"
    00011 #include "tile_cmd.h"
    00012 #include "rail_map.h"
    00013 #include "road_map.h"
    00014 #include "landscape.h"
    00015 #include "town_map.h"
    00016 #include "tunnel_map.h"
    00017 #include "viewport_func.h"
    00018 #include "command_func.h"
    00019 #include "pathfind.h"
    00020 #include "engine.h"
    00021 #include "town.h"
    00022 #include "station.h"
    00023 #include "sprite.h"
    00024 #include "depot.h"
    00025 #include "waypoint.h"
    00026 #include "rail.h"
    00027 #include "newgrf.h"
    00028 #include "yapf/yapf.h"
    00029 #include "newgrf_engine.h"
    00030 #include "newgrf_callbacks.h"
    00031 #include "newgrf_station.h"
    00032 #include "train.h"
    00033 #include "variables.h"
    00034 #include "autoslope.h"
    00035 #include "transparency.h"
    00036 #include "water.h"
    00037 #include "tunnelbridge_map.h"
    00038 #include "window_func.h"
    00039 #include "vehicle_func.h"
    00040 #include "sound_func.h"
    00041 #include "signal_func.h"
    00042 #include "tunnelbridge.h"
    00043
    00044 #include "table/sprites.h"
    00045 #include "table/strings.h"
    00046 #include "table/railtypes.h"
    00047 #include "table/track_land.h"
    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 void *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 players 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) && (!_patches.build_on_slopes || _is_old_ai_player))
    00290      ) return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00291
    00292   Foundation f_old = GetRailFoundation(tileh, existing);
    00293   return CommandCost(EXPENSES_CONSTRUCTION, f_new != f_old ? _price.terraform : (Money)0);
    00294 }
    00295
    00296 /* Validate functions for rail building */
    00297 static inline bool ValParamTrackOrientation(Track track) {return IsValidTrack(track);}
    00298
    00305 CommandCost CmdBuildSingleRail(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
    00306 {
    00307   Slope tileh;
    00308   RailType railtype = (RailType)p1;
    00309   Track track = (Track)p2;
    00310   TrackBits trackbit;
    00311   CommandCost cost(EXPENSES_CONSTRUCTION);
    00312   CommandCost ret;
    00313
    00314   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
    00315
    00316   tileh = GetTileSlope(tile, NULL);
    00317   trackbit = TrackToTrackBits(track);
    00318
    00319   switch (GetTileType(tile)) {
    00320     case MP_RAILWAY:
    00321       if (!CheckTrackCombination(tile, trackbit, flags) ||
    00322           !EnsureNoTrainOnTrack(tile, track)) {
    00323         return CMD_ERROR;
    00324       }
    00325       if (!IsTileOwner(tile, _current_player) ||
    00326           !IsCompatibleRail(GetRailType(tile), railtype)) {
    00327         /* Get detailed error message */
    00328         return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00329       }
    00330
    00331       ret = CheckRailSlope(tileh, trackbit, GetTrackBits(tile), tile);
    00332       if (CmdFailed(ret)) return ret;
    00333       cost.AddCost(ret);
    00334
    00335       /* If the rail types don't match, try to convert only if engines of
    00336        * the present rail type are powered on the new rail type. */
    00337       if (GetRailType(tile) != railtype && HasPowerOnRail(GetRailType(tile), railtype)) {
    00338         ret = DoCommand(tile, tile, railtype, flags, CMD_CONVERT_RAIL);
    00339         if (CmdFailed(ret)) return ret;
    00340         cost.AddCost(ret);
    00341       }
    00342
    00343       if (flags & DC_EXEC) {
    00344         SetRailGroundType(tile, RAIL_GROUND_BARREN);
    00345         SetTrackBits(tile, GetTrackBits(tile) | trackbit);
    00346       }
    00347       break;
    00348
    00349     case MP_ROAD:
    00350 #define M(x) (1 << (x))
    00351       /* Level crossings may only be built on these slopes */
    00352       if (!HasBit(M(SLOPE_SEN) | M(SLOPE_ENW) | M(SLOPE_NWS) | M(SLOPE_NS) | M(SLOPE_WSE) | M(SLOPE_EW) | M(SLOPE_FLAT), tileh)) {
    00353         return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00354       }
    00355 #undef M
    00356
    00357       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    00358
    00359       if (IsNormalRoad(tile)) {
    00360         if (HasRoadWorks(tile)) return_cmd_error(STR_ROAD_WORKS_IN_PROGRESS);
    00361
    00362         if (GetDisallowedRoadDirections(tile) != DRD_NONE) return_cmd_error(STR_ERR_CROSSING_ON_ONEWAY_ROAD);
    00363
    00364         RoadTypes roadtypes = GetRoadTypes(tile);
    00365         RoadBits road = GetRoadBits(tile, ROADTYPE_ROAD);
    00366         RoadBits tram = GetRoadBits(tile, ROADTYPE_TRAM);
    00367         switch (roadtypes) {
    00368           default: break;
    00369           case ROADTYPES_TRAM:
    00370             /* Tram crossings must always have road. */
    00371             if (flags & DC_EXEC) SetRoadOwner(tile, ROADTYPE_ROAD, _current_player);
    00372             roadtypes |= ROADTYPES_ROAD;
    00373             break;
    00374
    00375           case ROADTYPES_ROADTRAM: if (road == tram) break;
    00376             /* FALL THROUGH */
    00377           case ROADTYPES_ROADHWAY: // Road and highway are incompatible in this case
    00378           case ROADTYPES_TRAMHWAY: // Tram and highway are incompatible in this case
    00379           case ROADTYPES_ALL:      // Also incompatible
    00380             return CMD_ERROR;
    00381         }
    00382
    00383         road |= tram | GetRoadBits(tile, ROADTYPE_HWAY);
    00384
    00385         if ((track == TRACK_X && road == ROAD_Y) ||
    00386             (track == TRACK_Y && road == ROAD_X)) {
    00387           if (flags & DC_EXEC) {
    00388             MakeRoadCrossing(tile, GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), GetRoadOwner(tile, ROADTYPE_HWAY), _current_player, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, roadtypes, GetTownIndex(tile));
    00389             UpdateLevelCrossing(tile, false);
    00390           }
    00391           break;
    00392         }
    00393       }
    00394
    00395       if (IsLevelCrossing(tile) && GetCrossingRailBits(tile) == trackbit) {
    00396         return_cmd_error(STR_1007_ALREADY_BUILT);
    00397       }
    00398       /* FALLTHROUGH */
    00399
    00400     default:
    00401       /* Will there be flat water on the lower halftile? */
    00402       bool water_ground = IsTileType(tile, MP_WATER) && IsSlopeWithOneCornerRaised(tileh);
    00403
    00404       ret = CheckRailSlope(tileh, trackbit, TRACK_BIT_NONE, tile);
    00405       if (CmdFailed(ret)) return ret;
    00406       cost.AddCost(ret);
    00407
    00408       ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00409       if (CmdFailed(ret)) return ret;
    00410       cost.AddCost(ret);
    00411
    00412       if (water_ground) {
    00413         cost.AddCost(-_price.clear_water);
    00414         cost.AddCost(_price.clear_roughland);
    00415       }
    00416
    00417       if (flags & DC_EXEC) {
    00418         MakeRailNormal(tile, _current_player, trackbit, railtype);
    00419         if (water_ground) SetRailGroundType(tile, RAIL_GROUND_WATER);
    00420       }
    00421       break;
    00422   }
    00423
    00424   if (flags & DC_EXEC) {
    00425     MarkTileDirtyByTile(tile);
    00426     AddTrackToSignalBuffer(tile, track, _current_player);
    00427     YapfNotifyTrackLayoutChange(tile, track);
    00428   }
    00429
    00430   return cost.AddCost(RailBuildCost(railtype));
    00431 }
    00432
    00439 CommandCost CmdRemoveSingleRail(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
    00440 {
    00441   Track track = (Track)p2;
    00442   TrackBits trackbit;
    00443   CommandCost cost(EXPENSES_CONSTRUCTION, _price.remove_rail );
    00444   bool crossing = false;
    00445
    00446   if (!ValParamTrackOrientation((Track)p2)) return CMD_ERROR;
    00447   trackbit = TrackToTrackBits(track);
    00448
    00449   /* Need to read tile owner now because it may change when the rail is removed
    00450    * Also, in case of floods, _current_player != owner
    00451    * There may be invalid tiletype even in exec run (when removing long track),
    00452    * so do not call GetTileOwner(tile) in any case here */
    00453   Owner owner = INVALID_OWNER;
    00454
    00455   switch (GetTileType(tile)) {
    00456     case MP_ROAD: {
    00457       if (!IsLevelCrossing(tile) ||
    00458           GetCrossingRailBits(tile) != trackbit ||
    00459           (_current_player != OWNER_WATER && !CheckTileOwnership(tile)) ||
    00460           (!(flags & DC_BANKRUPT) && !EnsureNoVehicleOnGround(tile))) {
    00461         return CMD_ERROR;
    00462       }
    00463
    00464       if (flags & DC_EXEC) {
    00465         owner = GetTileOwner(tile);
    00466         MakeRoadNormal(tile, GetCrossingRoadBits(tile), GetRoadTypes(tile), GetTownIndex(tile), GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), GetRoadOwner(tile, ROADTYPE_HWAY));
    00467       }
    00468       break;
    00469     }
    00470
    00471     case MP_RAILWAY: {
    00472       TrackBits present;
    00473
    00474       if (!IsPlainRailTile(tile) ||
    00475           (_current_player != OWNER_WATER && !CheckTileOwnership(tile)) ||
    00476           !EnsureNoTrainOnTrack(tile, track)) {
    00477         return CMD_ERROR;
    00478       }
    00479
    00480       present = GetTrackBits(tile);
    00481       if ((present & trackbit) == 0) return CMD_ERROR;
    00482       if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
    00483
    00484       /* Charge extra to remove signals on the track, if they are there */
    00485       if (HasSignalOnTrack(tile, track))
    00486         cost.AddCost(DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS));
    00487
    00488       if (flags & DC_EXEC) {
    00489         owner = GetTileOwner(tile);
    00490         present ^= trackbit;
    00491         if (present == 0) {
    00492           Slope tileh = GetTileSlope(tile, NULL);
    00493           /* If there is flat water on the lower halftile, convert the tile to shore so the water remains */
    00494           if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh)) {
    00495             MakeShore(tile);
    00496           } else {
    00497             DoClearSquare(tile);
    00498           }
    00499         } else {
    00500           SetTrackBits(tile, present);
    00501         }
    00502       }
    00503       break;
    00504     }
    00505
    00506     default: return CMD_ERROR;
    00507   }
    00508
    00509   if (flags & DC_EXEC) {
    00510     /* if we got that far, 'owner' variable is set correctly */
    00511     assert(IsValidPlayer(owner));
    00512
    00513     MarkTileDirtyByTile(tile);
    00514     if (crossing) {
    00515       /* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we
    00516        * are removing one of these pieces, we'll need to update signals for
    00517        * both directions explicitly, as after the track is removed it won't
    00518        * 'connect' with the other piece. */
    00519       AddTrackToSignalBuffer(tile, TRACK_X, owner);
    00520       AddTrackToSignalBuffer(tile, TRACK_Y, owner);
    00521       YapfNotifyTrackLayoutChange(tile, TRACK_X);
    00522       YapfNotifyTrackLayoutChange(tile, TRACK_Y);
    00523     } else {
    00524       AddTrackToSignalBuffer(tile, track, owner);
    00525       YapfNotifyTrackLayoutChange(tile, track);
    00526     }
    00527   }
    00528
    00529   return cost;
    00530 }
    00531
    00532
    00540 bool FloodHalftile(TileIndex t)
    00541 {
    00542   bool flooded = false;
    00543   if (GetRailGroundType(t) == RAIL_GROUND_WATER) return flooded;
    00544
    00545   Slope tileh = GetTileSlope(t, NULL);
    00546   TrackBits rail_bits = GetTrackBits(t);
    00547
    00548   if (IsSlopeWithOneCornerRaised(tileh)) {
    00549     TrackBits lower_track = CornerToTrackBits(OppositeCorner(GetHighestSlopeCorner(tileh)));
    00550
    00551     TrackBits to_remove = lower_track & rail_bits;
    00552     if (to_remove != 0) {
    00553       _current_player = OWNER_WATER;
    00554       if (CmdFailed(DoCommand(t, 0, FIND_FIRST_BIT(to_remove), DC_EXEC, CMD_REMOVE_SINGLE_RAIL))) return flooded; // not yet floodable
    00555       flooded = true;
    00556       rail_bits = rail_bits & ~to_remove;
    00557       if (rail_bits == 0) {
    00558         MakeShore(t);
    00559         MarkTileDirtyByTile(t);
    00560         return flooded;
    00561       }
    00562     }
    00563
    00564     if (IsNonContinuousFoundation(GetRailFoundation(tileh, rail_bits))) {
    00565       flooded = true;
    00566       SetRailGroundType(t, RAIL_GROUND_WATER);
    00567       MarkTileDirtyByTile(t);
    00568     }
    00569   } else {
    00570     /* Make shore on steep slopes and 'three-corners-raised'-slopes. */
    00571     if (ApplyFoundationToSlope(GetRailFoundation(tileh, rail_bits), &tileh) == 0) {
    00572       if (IsSteepSlope(tileh) || IsSlopeWithThreeCornersRaised(tileh)) {
    00573         flooded = true;
    00574         SetRailGroundType(t, RAIL_GROUND_WATER);
    00575         MarkTileDirtyByTile(t);
    00576       }
    00577     }
    00578   }
    00579   return flooded;
    00580 }
    00581
    00582 static const TileIndexDiffC _trackdelta[] = {
    00583   { -1,  0 }, {  0,  1 }, { -1,  0 }, {  0,  1 }, {  1,  0 }, {  0,  1 },
    00584   {  0,  0 },
    00585   {  0,  0 },
    00586   {  1,  0 }, {  0, -1 }, {  0, -1 }, {  1,  0 }, {  0, -1 }, { -1,  0 },
    00587   {  0,  0 },
    00588   {  0,  0 }
    00589 };
    00590
    00591
    00592 static CommandCost ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)
    00593 {
    00594   int x = TileX(start);
    00595   int y = TileY(start);
    00596   int ex = TileX(end);
    00597   int ey = TileY(end);
    00598   int dx, dy, trdx, trdy;
    00599
    00600   if (!ValParamTrackOrientation(TrackdirToTrack(*trackdir))) return CMD_ERROR;
    00601
    00602   /* calculate delta x,y from start to end tile */
    00603   dx = ex - x;
    00604   dy = ey - y;
    00605
    00606   /* calculate delta x,y for the first direction */
    00607   trdx = _trackdelta[*trackdir].x;
    00608   trdy = _trackdelta[*trackdir].y;
    00609
    00610   if (!IsDiagonalTrackdir(*trackdir)) {
    00611     trdx += _trackdelta[*trackdir ^ 1].x;
    00612     trdy += _trackdelta[*trackdir ^ 1].y;
    00613   }
    00614
    00615   /* validate the direction */
    00616   while (
    00617     (trdx <= 0 && dx > 0) ||
    00618     (trdx >= 0 && dx < 0) ||
    00619     (trdy <= 0 && dy > 0) ||
    00620     (trdy >= 0 && dy < 0)
    00621   ) {
    00622     if (!HasBit(*trackdir, 3)) { // first direction is invalid, try the other
    00623       SetBit(*trackdir, 3); // reverse the direction
    00624       trdx = -trdx;
    00625       trdy = -trdy;
    00626     } else { // other direction is invalid too, invalid drag
    00627       return CMD_ERROR;
    00628     }
    00629   }
    00630
    00631   /* (for diagonal tracks, this is already made sure of by above test), but:
    00632    * for non-diagonal tracks, check if the start and end tile are on 1 line */
    00633   if (!IsDiagonalTrackdir(*trackdir)) {
    00634     trdx = _trackdelta[*trackdir].x;
    00635     trdy = _trackdelta[*trackdir].y;
    00636     if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx))
    00637       return CMD_ERROR;
    00638   }
    00639
    00640   return CommandCost();
    00641 }
    00642
    00652 static CommandCost CmdRailTrackHelper(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
    00653 {
    00654   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
    00655   Track track = (Track)GB(p2, 4, 3);
    00656   Trackdir trackdir;
    00657   byte mode = HasBit(p2, 7);
    00658   RailType railtype = (RailType)GB(p2, 0, 4);
    00659   TileIndex end_tile;
    00660
    00661   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
    00662   if (p1 >= MapSize()) return CMD_ERROR;
    00663   end_tile = p1;
    00664   trackdir = TrackToTrackdir(track);
    00665
    00666   if (CmdFailed(ValidateAutoDrag(&trackdir, tile, end_tile))) return CMD_ERROR;
    00667
    00668   if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, tile);
    00669
    00670   for (;;) {
    00671     ret = DoCommand(tile, railtype, TrackdirToTrack(trackdir), flags, (mode == 0) ? CMD_BUILD_SINGLE_RAIL : CMD_REMOVE_SINGLE_RAIL);
    00672
    00673     if (CmdFailed(ret)) {
    00674       if ((_error_message != STR_1007_ALREADY_BUILT) && (mode == 0)) break;
    00675       _error_message = INVALID_STRING_ID;
    00676     } else {
    00677       total_cost.AddCost(ret);
    00678     }
    00679
    00680     if (tile == end_tile) break;
    00681
    00682     tile += ToTileIndexDiff(_trackdelta[trackdir]);
    00683
    00684     /* toggle railbit for the non-diagonal tracks */
    00685     if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
    00686   }
    00687
    00688   return (total_cost.GetCost() == 0) ? CMD_ERROR : total_cost;
    00689 }
    00690
    00702 CommandCost CmdBuildRailroadTrack(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
    00703 {
    00704   return CmdRailTrackHelper(tile, flags, p1, ClrBit(p2, 7));
    00705 }
    00706
    00718 CommandCost CmdRemoveRailroadTrack(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
    00719 {
    00720   return CmdRailTrackHelper(tile, flags, p1, SetBit(p2, 7));
    00721 }
    00722
    00732 CommandCost CmdBuildTrainDepot(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
    00733 {
    00734   Slope tileh;
    00735
    00736   /* check railtype and valid direction for depot (0 through 3), 4 in total */
    00737   if (!ValParamRailtype((RailType)p1)) return CMD_ERROR;
    00738
    00739   tileh = GetTileSlope(tile, NULL);
    00740
    00741   DiagDirection dir = Extract<DiagDirection, 0>(p2);
    00742
    00743   /* Prohibit construction if
    00744    * The tile is non-flat AND
    00745    * 1) The AI is "old-school"
    00746    * 2) build-on-slopes is disabled
    00747    * 3) the tile is steep i.e. spans two height levels
    00748    * 4) the exit points in the wrong direction
    00749    */
    00750
    00751   if (tileh != SLOPE_FLAT && (
    00752         _is_old_ai_player ||
    00753         !_patches.build_on_slopes ||
    00754         IsSteepSlope(tileh) ||
    00755         !CanBuildDepotByTileh(dir, tileh)
    00756       )) {
    00757     return_cmd_error(STR_0007_FLAT_LAND_REQUIRED);
    00758   }
    00759
    00760   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00761   if (CmdFailed(cost)) return CMD_ERROR;
    00762
    00763   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00764
    00765   if (!Depot::CanAllocateItem()) return CMD_ERROR;
    00766
    00767   if (flags & DC_EXEC) {
    00768     Depot *d = new Depot(tile);
    00769     MakeRailDepot(tile, _current_player, dir, (RailType)p1);
    00770     MarkTileDirtyByTile(tile);
    00771
    00772     d->town_index = ClosestTownFromTile(tile, (uint)-1)->index;
    00773
    00774     AddSideToSignalBuffer(tile, INVALID_DIAGDIR, _current_player);
    00775     YapfNotifyTrackLayoutChange(tile, TrackdirToTrack(DiagdirToDiagTrackdir(dir)));
    00776   }
    00777
    00778   return cost.AddCost(_price.build_train_depot);
    00779 }
    00780
    00795 CommandCost CmdBuildSingleSignal(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
    00796 {
    00797   Track track = (Track)GB(p1, 0, 3);
    00798   bool ctrl_pressed = HasBit(p1, 3); // was the CTRL button pressed
    00799   SignalVariant sigvar = (ctrl_pressed ^ HasBit(p1, 4)) ? SIG_SEMAPHORE : SIG_ELECTRIC; // the signal variant of the new signal
    00800   SignalType sigtype = (SignalType)GB(p1, 5, 2); // the signal type of the new signal
    00801   bool convert_signal = HasBit(p1, 7); // convert button pressed
    00802   CommandCost cost;
    00803
    00804   if (!ValParamTrackOrientation(track) || !IsTileType(tile, MP_RAILWAY) || !EnsureNoTrainOnTrack(tile, track))
    00805     return CMD_ERROR;
    00806
    00807   /* Protect against invalid signal copying */
    00808   if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
    00809
    00810   /* You can only build signals on plain rail tiles, and the selected track must exist */
    00811   if (!IsPlainRailTile(tile) || !HasTrack(tile, track)) return CMD_ERROR;
    00812
    00813   if (!CheckTileOwnership(tile)) return CMD_ERROR;
    00814
    00815   {
    00816     /* See if this is a valid track combination for signals, (ie, no overlap) */
    00817     TrackBits trackbits = GetTrackBits(tile);
    00818     if (KillFirstBit(trackbits) != TRACK_BIT_NONE && /* More than one track present */
    00819         trackbits != TRACK_BIT_HORZ &&
    00820         trackbits != TRACK_BIT_VERT) {
    00821       return_cmd_error(STR_1005_NO_SUITABLE_RAILROAD_TRACK);
    00822     }
    00823   }
    00824
    00825   /* you can not convert a signal if no signal is on track */
    00826   if (convert_signal && !HasSignalOnTrack(tile, track)) return CMD_ERROR;
    00827
    00828   if (!HasSignalOnTrack(tile, track)) {
    00829     /* build new signals */
    00830     cost = CommandCost(EXPENSES_CONSTRUCTION, _price.build_signals);
    00831   } else {
    00832     if (p2 != 0 && sigvar != GetSignalVariant(tile, track)) {
    00833       /* convert signals <-> semaphores */
    00834       cost = CommandCost(EXPENSES_CONSTRUCTION, _price.build_signals + _price.remove_signals);
    00835
    00836     } else if (convert_signal) {
    00837       /* convert button pressed */
    00838       if (ctrl_pressed || GetSignalVariant(tile, track) != sigvar) {
    00839         /* convert electric <-> semaphore */
    00840         cost = CommandCost(EXPENSES_CONSTRUCTION, _price.build_signals + _price.remove_signals);
    00841       } else {
    00842         /* it is free to change signal type: normal-pre-exit-combo */
    00843         cost = CommandCost();
    00844       }
    00845
    00846     } else {
    00847       /* it is free to change orientation/pre-exit-combo signals */
    00848       cost = CommandCost();
    00849     }
    00850   }
    00851
    00852   if (flags & DC_EXEC) {
    00853     if (!HasSignals(tile)) {
    00854       /* there are no signals at all on this tile yet */
    00855       SetHasSignals(tile, true);
    00856       SetSignalStates(tile, 0xF); // all signals are on
    00857       SetPresentSignals(tile, 0); // no signals built by default
    00858       SetSignalType(tile, track, sigtype);
    00859       SetSignalVariant(tile, track, sigvar);
    00860     }
    00861
    00862     if (p2 == 0) {
    00863       if (!HasSignalOnTrack(tile, track)) {
    00864         /* build new signals */
    00865         SetPresentSignals(tile, GetPresentSignals(tile) | SignalOnTrack(track));
    00866         SetSignalType(tile, track, sigtype);
    00867         SetSignalVariant(tile, track, sigvar);
    00868       } else {
    00869         if (convert_signal) {
    00870           /* convert signal button pressed */
    00871           if (ctrl_pressed) {
    00872             /* toggle the pressent signal variant: SIG_ELECTRIC <-> SIG_SEMAPHORE */
    00873             SetSignalVariant(tile, track, (GetSignalVariant(tile, track) == SIG_ELECTRIC) ? SIG_SEMAPHORE : SIG_ELECTRIC);
    00874
    00875           } else {
    00876             /* convert the present signal to the chosen type and variant */
    00877             SetSignalType(tile, track, sigtype);
    00878             SetSignalVariant(tile, track, sigvar);
    00879           }
    00880
    00881         } else if (ctrl_pressed) {
    00882           /* cycle between normal -> pre -> exit -> combo -> ... */
    00883           sigtype = GetSignalType(tile, track);
    00884
    00885           SetSignalType(tile, track, sigtype == SIGTYPE_COMBO ? SIGTYPE_NORMAL : (SignalType)(sigtype + 1));
    00886         } else {
    00887           /* cycle the signal side: both -> left -> right -> both -> ... */
    00888           CycleSignalSide(tile, track);
    00889         }
    00890       }
    00891     } else {
    00892       /* If CmdBuildManySignals is called with copying signals, just copy the
    00893        * direction of the first signal given as parameter by CmdBuildManySignals */
    00894       SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | (p2 & SignalOnTrack(track)));
    00895       SetSignalVariant(tile, track, sigvar);
    00896     }
    00897
    00898     MarkTileDirtyByTile(tile);
    00899     AddTrackToSignalBuffer(tile, track, _current_player);
    00900     YapfNotifyTrackLayoutChange(tile, track);
    00901   }
    00902
    00903   return cost;
    00904 }
    00905
    00906 static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
    00907 {
    00908   tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
    00909   if (tile == INVALID_TILE) return false;
    00910
    00911   /* Check for track bits on the new tile */
    00912   TrackdirBits trackdirbits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
    00913
    00914   if (TracksOverlap(TrackdirBitsToTrackBits(trackdirbits))) return false;
    00915   trackdirbits &= TrackdirReachesTrackdirs(trackdir);
    00916
    00917   /* No track bits, must stop */
    00918   if (trackdirbits == TRACKDIR_BIT_NONE) return false;
    00919
    00920   /* Get the first track dir */
    00921   trackdir = RemoveFirstTrackdir(&trackdirbits);
    00922
    00923   /* Any left? It's a junction so we stop */
    00924   if (trackdirbits != TRACKDIR_BIT_NONE) return false;
    00925
    00926   switch (GetTileType(tile)) {
    00927     case MP_RAILWAY:
    00928       if (IsRailDepot(tile)) return false;
    00929       if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
    00930       signal_ctr++;
    00931       if (IsDiagonalTrackdir(trackdir)) {
    00932         signal_ctr++;
    00933         /* Ensure signal_ctr even so X and Y pieces get signals */
    00934         ClrBit(signal_ctr, 0);
    00935       }
    00936       return true;
    00937
    00938     case MP_ROAD:
    00939       if (!IsLevelCrossing(tile)) return false;
    00940       signal_ctr += 2;
    00941       return true;
    00942
    00943     case MP_TUNNELBRIDGE: {
    00944       TileIndex orig_tile = tile; // backup old value
    00945
    00946       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
    00947       if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
    00948
    00949       /* Skip to end of tunnel or bridge
    00950        * note that tile is a parameter by reference, so it must be updated */
    00951       tile = GetOtherTunnelBridgeEnd(tile);
    00952
    00953       signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
    00954       return true;
    00955     }
    00956
    00957     default: return false;
    00958   }
    00959 }
    00960
    00973 static CommandCost CmdSignalTrackHelper(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
    00974 {
    00975   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
    00976   int signal_ctr;
    00977   byte signals;
    00978   bool error = true;
    00979   TileIndex end_tile;
    00980   TileIndex start_tile = tile;
    00981
    00982   Track track = (Track)GB(p2, 0, 3);
    00983   bool mode = HasBit(p2, 3);
    00984   bool semaphores = HasBit(p2, 4);
    00985   bool remove = HasBit(p2, 5);
    00986   bool autofill = HasBit(p2, 6);
    00987   Trackdir trackdir = TrackToTrackdir(track);
    00988   byte signal_density = GB(p2, 24, 8);
    00989
    00990   if (p1 >= MapSize()) return CMD_ERROR;
    00991   end_tile = p1;
    00992   if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
    00993
    00994   if (!IsTileType(tile, MP_RAILWAY)) return CMD_ERROR;
    00995
    00996   /* for vertical/horizontal tracks, double the given signals density
    00997    * since the original amount will be too dense (shorter tracks) */
    00998   signal_density *= 2;
    00999
    01000   if (CmdFailed(ValidateAutoDrag(&trackdir, tile, end_tile))) return CMD_ERROR;
    01001
    01002   track = TrackdirToTrack(trackdir); /* trackdir might have changed, keep track in sync */
    01003   Trackdir start_trackdir = trackdir;
    01004
    01005   /* Autofill must start on a valid track to be able to avoid loops */
    01006   if (autofill && !HasTrack(tile, track)) return CMD_ERROR;
    01007
    01008   /* copy the signal-style of the first rail-piece if existing */
    01009   if (HasSignals(tile)) {
    01010     signals = GetPresentSignals(tile) & SignalOnTrack(track);
    01011     if (signals == 0) signals = SignalOnTrack(track); /* Can this actually occur? */
    01012
    01013     /* copy signal/semaphores style (independent of CTRL) */
    01014     semaphores = GetSignalVariant(tile, track) != SIG_ELECTRIC;
    01015   } else { // no signals exist, drag a two-way signal stretch
    01016     signals = SignalOnTrack(track);
    01017   }
    01018
    01019   byte signal_dir = 0;
    01020   if (signals & SignalAlongTrackdir(trackdir))   SetBit(signal_dir, 0);
    01021   if (signals & SignalAgainstTrackdir(trackdir)) SetBit(signal_dir, 1);
    01022
    01023   /* signal_ctr         - amount of tiles already processed
    01024    * signals_density    - patch setting to put signal on every Nth tile (double space on |, -- tracks)
    01025    **********
    01026    * trackdir   - trackdir to build with autorail
    01027    * semaphores - semaphores or signals
    01028    * signals    - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
    01029    *              and convert all others to semaphore/signal
    01030    * remove     - 1 remove signals, 0 build signals */
    01031   signal_ctr = 0;
    01032   for (;;) {
    01033     /* only build/remove signals with the specified density */
    01034     if ((remove && autofill) || signal_ctr % signal_density == 0) {
    01035       uint32 p1 = GB(TrackdirToTrack(trackdir), 0, 3);
    01036       SB(p1, 3, 1, mode);
    01037       SB(p1, 4, 1, semaphores);
    01038
    01039       /* Pick the correct orientation for the track direction */
    01040       signals = 0;
    01041       if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
    01042       if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
    01043
    01044       ret = DoCommand(tile, p1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
    01045
    01046       /* Be user-friendly and try placing signals as much as possible */
    01047       if (CmdSucceeded(ret)) {
    01048         error = false;
    01049         total_cost.AddCost(ret);
    01050       }
    01051     }
    01052
    01053     if (autofill) {
    01054       if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
    01055
    01056       /* Prevent possible loops */
    01057       if (tile == start_tile && trackdir == start_trackdir) break;
    01058     } else {
    01059       if (tile == end_tile) break;
    01060
    01061       tile += ToTileIndexDiff(_trackdelta[trackdir]);
    01062       signal_ctr++;
    01063
    01064       /* toggle railbit for the non-diagonal tracks (|, -- tracks) */
    01065       if (IsDiagonalTrackdir(trackdir)) {
    01066         signal_ctr++;
    01067       } else {
    01068         ToggleBit(trackdir, 0);
    01069       }
    01070     }
    01071   }
    01072
    01073   return error ? CMD_ERROR : total_cost;
    01074 }
    01075
    01090 CommandCost CmdBuildSignalTrack(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
    01091 {
    01092   return CmdSignalTrackHelper(tile, flags, p1, p2);
    01093 }
    01094
    01104 CommandCost CmdRemoveSingleSignal(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
    01105 {
    01106   Track track = (Track)GB(p1, 0, 3);
    01107
    01108   if (!ValParamTrackOrientation(track) ||
    01109       !IsTileType(tile, MP_RAILWAY) ||
    01110       !HasTrack(tile, track) ||
    01111       !EnsureNoTrainOnTrack(tile, track) ||
    01112       !HasSignalOnTrack(tile, track)) {
    01113     return CMD_ERROR;
    01114   }
    01115
    01116   /* Only water can remove signals from anyone */
    01117   if (_current_player != OWNER_WATER && !CheckTileOwnership(tile)) return CMD_ERROR;
    01118
    01119   /* Do it? */
    01120   if (flags & DC_EXEC) {
    01121     SetPresentSignals(tile, GetPresentSignals(tile) & ~SignalOnTrack(track));
    01122
    01123     /* removed last signal from tile? */
    01124     if (GetPresentSignals(tile) == 0) {
    01125       SetSignalStates(tile, 0);
    01126       SetHasSignals(tile, false);
    01127       SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
    01128     }
    01129
    01130     AddTrackToSignalBuffer(tile, track, GetTileOwner(tile));
    01131     YapfNotifyTrackLayoutChange(tile, track);
    01132
    01133     MarkTileDirtyByTile(tile);
    01134   }
    01135
    01136   return CommandCost(EXPENSES_CONSTRUCTION, _price.remove_signals);
    01137 }
    01138
    01153 CommandCost CmdRemoveSignalTrack(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
    01154 {
    01155   return CmdSignalTrackHelper(tile, flags, p1, SetBit(p2, 5)); // bit 5 is remove bit
    01156 }
    01157
    01159 void *UpdateTrainPowerProc(Vehicle *v, void *data)
    01160 {
    01161   /* Similiar checks as in TrainPowerChanged() */
    01162
    01163   if (v->type == VEH_TRAIN && !IsArticulatedPart(v)) {
    01164     const RailVehicleInfo *rvi = RailVehInfo(v->engine_type);
    01165     if (GetVehicleProperty(v, 0x0B, rvi->power) != 0) TrainPowerChanged(v->First());
    01166   }
    01167
    01168   return NULL;
    01169 }
    01170
    01178 CommandCost CmdConvertRail(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
    01179 {
    01180   CommandCost cost(EXPENSES_CONSTRUCTION);
    01181   RailType totype = (RailType)p2;
    01182
    01183   if (!ValParamRailtype(totype)) return CMD_ERROR;
    01184   if (p1 >= MapSize()) return CMD_ERROR;
    01185
    01186   uint ex = TileX(tile);
    01187   uint ey = TileY(tile);
    01188   uint sx = TileX(p1);
    01189   uint sy = TileY(p1);
    01190
    01191   /* make sure sx,sy are smaller than ex,ey */
    01192   if (ex < sx) Swap(ex, sx);
    01193   if (ey < sy) Swap(ey, sy);
    01194
    01195   _error_message = STR_1005_NO_SUITABLE_RAILROAD_TRACK; // by default, there is no track to convert
    01196
    01197   for (uint x = sx; x <= ex; ++x) {
    01198     for (uint y = sy; y <= ey; ++y) {
    01199       TileIndex tile = TileXY(x, y);
    01200       TileType tt = GetTileType(tile);
    01201
    01202       /* Check if there is any track on tile */
    01203       switch (tt) {
    01204         case MP_RAILWAY:
    01205           break;
    01206         case MP_STATION:
    01207           if (!IsRailwayStation(tile)) continue;
    01208           break;
    01209         case MP_ROAD:
    01210           if (!IsLevelCrossing(tile)) continue;
    01211           break;
    01212         case MP_TUNNELBRIDGE:
    01213           if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
    01214           break;
    01215         default: continue;
    01216       }
    01217
    01218       /* Original railtype we are converting from */
    01219       RailType type = GetRailType(tile);
    01220
    01221       /* Converting to the same type or converting 'hidden' elrail -> rail */
    01222       if (type == totype || (_patches.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
    01223
    01224       /* Trying to convert other's rail */
    01225       if (!CheckTileOwnership(tile)) continue;
    01226
    01227       /* Vehicle on the tile when not converting Rail <-> ElRail
    01228        * Tunnels and bridges have special check later */
    01229       if (tt != MP_TUNNELBRIDGE) {
    01230         if (!IsCompatibleRail(type, totype) && !EnsureNoVehicleOnGround(tile)) continue;
    01231         if (flags & DC_EXEC) { // we can safely convert, too
    01232           SetRailType(tile, totype);
    01233           MarkTileDirtyByTile(tile);
    01234           /* update power of train engines on this tile */
    01235           FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
    01236         }
    01237       }
    01238
    01239       switch (tt) {
    01240         case MP_RAILWAY:
    01241           switch (GetRailTileType(tile)) {
    01242             case RAIL_TILE_WAYPOINT:
    01243               if (flags & DC_EXEC) {
    01244                 /* notify YAPF about the track layout change */
    01245                 YapfNotifyTrackLayoutChange(tile, AxisToTrack(GetWaypointAxis(tile)));
    01246               }
    01247               cost.AddCost(RailConvertCost(type, totype));
    01248               break;
    01249
    01250             case RAIL_TILE_DEPOT:
    01251               if (flags & DC_EXEC) {
    01252                 /* notify YAPF about the track layout change */
    01253                 YapfNotifyTrackLayoutChange(tile, AxisToTrack(DiagDirToAxis(GetRailDepotDirection(tile))));
    01254
    01255                 /* Update build vehicle window related to this depot */
    01256                 InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
    01257                 InvalidateWindowData(WC_BUILD_VEHICLE, tile);
    01258               }
    01259               cost.AddCost(RailConvertCost(type, totype));
    01260               break;
    01261
    01262             default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
    01263               if (flags & DC_EXEC) {
    01264                 /* notify YAPF about the track layout change */
    01265                 TrackBits tracks = GetTrackBits(tile);
    01266                 while (tracks != TRACK_BIT_NONE) {
    01267                   YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
    01268                 }
    01269               }
    01270               cost.AddCost(RailConvertCost(type, totype) * CountBits(GetTrackBits(tile)));
    01271               break;
    01272           }
    01273           break;
    01274
    01275         case MP_TUNNELBRIDGE: {
    01276           TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
    01277
    01278           /* If both ends of tunnel/bridge are in the range, do not try to convert twice -
    01279            * it would cause assert because of different test and exec runs */
    01280           if (endtile < tile && TileX(endtile) >= sx && TileX(endtile) <= ex &&
    01281               TileY(endtile) >= sy && TileY(endtile) <= ey) continue;
    01282
    01283           /* When not coverting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
    01284           if (!IsCompatibleRail(GetRailType(tile), totype) &&
    01285               HasVehicleOnTunnelBridge(tile, endtile)) continue;
    01286
    01287           if (flags & DC_EXEC) {
    01288             SetRailType(tile, totype);
    01289             SetRailType(endtile, totype);
    01290
    01291             FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
    01292             FindVehicleOnPos(endtile, NULL, &UpdateTrainPowerProc);
    01293
    01294             Track track = AxisToTrack(DiagDirToAxis(GetTunnelBridgeDirection(tile)));
    01295
    01296             YapfNotifyTrackLayoutChange(tile, track);
    01297             YapfNotifyTrackLayoutChange(endtile, track);
    01298
    01299             MarkTileDirtyByTile(tile);
    01300             MarkTileDirtyByTile(endtile);
    01301
    01302             if (IsBridge(tile)) {
    01303               TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
    01304               TileIndex t = tile + delta;
    01305               for (; t != endtile; t += delta) MarkTileDirtyByTile(t); // TODO encapsulate this into a function
    01306             }
    01307           }
    01308
    01309           cost.AddCost((GetTunnelBridgeLength(tile, endtile) + 2) * RailConvertCost(type, totype));
    01310         } break;
    01311
    01312         default: // MP_STATION, MP_ROAD
    01313           if (flags & DC_EXEC) {
    01314             Track track = ((tt == MP_STATION) ? GetRailStationTrack(tile) : GetCrossingRailTrack(tile));
    01315             YapfNotifyTrackLayoutChange(tile, track);
    01316           }
    01317
    01318           cost.AddCost(RailConvertCost(type, totype));
    01319           break;
    01320       }
    01321     }
    01322   }
    01323
    01324   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
    01325 }
    01326
    01327 static CommandCost RemoveTrainDepot(TileIndex tile, uint32 flags)
    01328 {
    01329   if (!CheckTileOwnership(tile) && _current_player != OWNER_WATER)
    01330     return CMD_ERROR;
    01331
    01332   if (!EnsureNoVehicleOnGround(tile))
    01333     return CMD_ERROR;
    01334
    01335   if (flags & DC_EXEC) {
    01336     /* read variables before the depot is removed */
    01337     DiagDirection dir = GetRailDepotDirection(tile);
    01338     Owner owner = GetTileOwner(tile);
    01339
    01340     DoClearSquare(tile);
    01341     delete GetDepotByTile(tile);
    01342     AddSideToSignalBuffer(tile, dir, owner);
    01343     YapfNotifyTrackLayoutChange(tile, TrackdirToTrack(DiagdirToDiagTrackdir(dir)));
    01344   }
    01345
    01346   return CommandCost(EXPENSES_CONSTRUCTION, _price.remove_train_depot);
    01347 }
    01348
    01349 static CommandCost ClearTile_Track(TileIndex tile, byte flags)
    01350 {
    01351   CommandCost cost(EXPENSES_CONSTRUCTION);
    01352   CommandCost ret;
    01353
    01354   if (flags & DC_AUTO) {
    01355     if (!IsTileOwner(tile, _current_player))
    01356       return_cmd_error(STR_1024_AREA_IS_OWNED_BY_ANOTHER);
    01357
    01358     if (IsPlainRailTile(tile)) {
    01359       return_cmd_error(STR_1008_MUST_REMOVE_RAILROAD_TRACK);
    01360     } else {
    01361       return_cmd_error(STR_2004_BUILDING_MUST_BE_DEMOLISHED);
    01362     }
    01363   }
    01364
    01365   switch (GetRailTileType(tile)) {
    01366     case RAIL_TILE_SIGNALS:
    01367     case RAIL_TILE_NORMAL: {
    01368       Slope tileh = GetTileSlope(tile, NULL);
    01369       /* Is there flat water on the lower halftile, that gets cleared expensively? */
    01370       bool water_ground = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh));
    01371
    01372       TrackBits tracks = GetTrackBits(tile);
    01373       while (tracks != TRACK_BIT_NONE) {
    01374         Track track = RemoveFirstTrack(&tracks);
    01375         ret = DoCommand(tile, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
    01376         if (CmdFailed(ret)) return CMD_ERROR;
    01377         cost.AddCost(ret);
    01378       }
    01379
    01380       /* when bankrupting, don't make water dirty, there could be a ship on lower halftile */
    01381       if (water_ground && !(flags & DC_BANKRUPT)) {
    01382         if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
    01383
    01384         /* The track was removed, and left a coast tile. Now also clear the water. */
    01385         if (flags & DC_EXEC) DoClearSquare(tile);
    01386         cost.AddCost(_price.clear_water);
    01387       }
    01388
    01389       return cost;
    01390     }
    01391
    01392     case RAIL_TILE_DEPOT:
    01393       return RemoveTrainDepot(tile, flags);
    01394
    01395     case RAIL_TILE_WAYPOINT:
    01396       return RemoveTrainWaypoint(tile, flags, false);
    01397
    01398     default:
    01399       return CMD_ERROR;
    01400   }
    01401 }
    01402
    01407 static uint GetSaveSlopeZ(uint x, uint y, Track track)
    01408 {
    01409   switch (track) {
    01410     case TRACK_UPPER: x &= ~0xF; y &= ~0xF; break;
    01411     case TRACK_LOWER: x |=  0xF; y |=  0xF; break;
    01412     case TRACK_LEFT:  x |=  0xF; y &= ~0xF; break;
    01413     case TRACK_RIGHT: x &= ~0xF; y |=  0xF; break;
    01414     default: break;
    01415   }
    01416   return GetSlopeZ(x, y);
    01417 }
    01418
    01419 static void DrawSingleSignal(TileIndex tile, Track track, byte condition, uint image, uint pos)
    01420 {
    01421   bool side = (_opt.road_side != 0) && _patches.signal_side;
    01422   static const Point SignalPositions[2][12] = {
    01423     {      /* Signals on the left side */
    01424     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01425       { 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
    01426     /*  LOWER     LOWER     X         X         Y         Y     */
    01427       {11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
    01428     }, {   /* Signals on the right side */
    01429     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01430       {14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
    01431     /*  LOWER     LOWER     X         X         Y         Y     */
    01432       {14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
    01433     }
    01434   };
    01435
    01436   uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
    01437   uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
    01438
    01439   SpriteID sprite;
    01440
    01441   SignalType type       = GetSignalType(tile, track);
    01442   SignalVariant variant = GetSignalVariant(tile, track);
    01443
    01444   if (type == SIGTYPE_NORMAL && variant == SIG_ELECTRIC) {
    01445     /* Normal electric signals are picked from original sprites. */
    01446     sprite = SPR_ORIGINAL_SIGNALS_BASE + image + condition;
    01447   } else {
    01448     /* All other signals are picked from add on sprites. */
    01449     sprite = SPR_SIGNALS_BASE + (type - 1) * 16 + variant * 64 + image + condition;
    01450   }
    01451
    01452   AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, GetSaveSlopeZ(x, y, track));
    01453 }
    01454
    01455 static uint32 _drawtile_track_palette;
    01456
    01457
    01458 static void DrawTrackFence_NW(const TileInfo *ti)
    01459 {
    01460   SpriteID image = SPR_TRACK_FENCE_FLAT_X;
    01461   if (ti->tileh != SLOPE_FLAT) image = (ti->tileh & SLOPE_S) ? SPR_TRACK_FENCE_SLOPE_SW : SPR_TRACK_FENCE_SLOPE_NE;
    01462   AddSortableSpriteToDraw(image, _drawtile_track_palette,
    01463     ti->x, ti->y + 1, 16, 1, 4, ti->z);
    01464 }
    01465
    01466 static void DrawTrackFence_SE(const TileInfo *ti)
    01467 {
    01468   SpriteID image = SPR_TRACK_FENCE_FLAT_X;
    01469   if (ti->tileh != SLOPE_FLAT) image = (ti->tileh & SLOPE_S) ? SPR_TRACK_FENCE_SLOPE_SW : SPR_TRACK_FENCE_SLOPE_NE;
    01470   AddSortableSpriteToDraw(image, _drawtile_track_palette,
    01471     ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
    01472 }
    01473
    01474 static void DrawTrackFence_NW_SE(const TileInfo *ti)
    01475 {
    01476   DrawTrackFence_NW(ti);
    01477   DrawTrackFence_SE(ti);
    01478 }
    01479
    01480 static void DrawTrackFence_NE(const TileInfo *ti)
    01481 {
    01482   SpriteID image = SPR_TRACK_FENCE_FLAT_Y;
    01483   if (ti->tileh != SLOPE_FLAT) image = (ti->tileh & SLOPE_S) ? SPR_TRACK_FENCE_SLOPE_SE : SPR_TRACK_FENCE_SLOPE_NW;
    01484   AddSortableSpriteToDraw(image, _drawtile_track_palette,
    01485     ti->x + 1, ti->y, 1, 16, 4, ti->z);
    01486 }
    01487
    01488 static void DrawTrackFence_SW(const TileInfo *ti)
    01489 {
    01490   SpriteID image = SPR_TRACK_FENCE_FLAT_Y;
    01491   if (ti->tileh != SLOPE_FLAT) image = (ti->tileh & SLOPE_S) ? SPR_TRACK_FENCE_SLOPE_SE : SPR_TRACK_FENCE_SLOPE_NW;
    01492   AddSortableSpriteToDraw(image, _drawtile_track_palette,
    01493     ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
    01494 }
    01495
    01496 static void DrawTrackFence_NE_SW(const TileInfo *ti)
    01497 {
    01498   DrawTrackFence_NE(ti);
    01499   DrawTrackFence_SW(ti);
    01500 }
    01501
    01505 static void DrawTrackFence_NS_1(const TileInfo *ti)
    01506 {
    01507   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_W);
    01508   AddSortableSpriteToDraw(SPR_TRACK_FENCE_FLAT_VERT, _drawtile_track_palette,
    01509     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01510 }
    01511
    01515 static void DrawTrackFence_NS_2(const TileInfo *ti)
    01516 {
    01517   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_E);
    01518   AddSortableSpriteToDraw(SPR_TRACK_FENCE_FLAT_VERT, _drawtile_track_palette,
    01519     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01520 }
    01521
    01525 static void DrawTrackFence_WE_1(const TileInfo *ti)
    01526 {
    01527   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_N);
    01528   AddSortableSpriteToDraw(SPR_TRACK_FENCE_FLAT_HORZ, _drawtile_track_palette,
    01529     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01530 }
    01531
    01535 static void DrawTrackFence_WE_2(const TileInfo *ti)
    01536 {
    01537   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_S);
    01538   AddSortableSpriteToDraw(SPR_TRACK_FENCE_FLAT_HORZ, _drawtile_track_palette,
    01539     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01540 }
    01541
    01542
    01543 static void DrawTrackDetails(const TileInfo* ti)
    01544 {
    01545   switch (GetRailGroundType(ti->tile)) {
    01546     case RAIL_GROUND_FENCE_NW:     DrawTrackFence_NW(ti);    break;
    01547     case RAIL_GROUND_FENCE_SE:     DrawTrackFence_SE(ti);    break;
    01548     case RAIL_GROUND_FENCE_SENW:   DrawTrackFence_NW_SE(ti); break;
    01549     case RAIL_GROUND_FENCE_NE:     DrawTrackFence_NE(ti);    break;
    01550     case RAIL_GROUND_FENCE_SW:     DrawTrackFence_SW(ti);    break;
    01551     case RAIL_GROUND_FENCE_NESW:   DrawTrackFence_NE_SW(ti); break;
    01552     case RAIL_GROUND_FENCE_VERT1:  DrawTrackFence_NS_1(ti);  break;
    01553     case RAIL_GROUND_FENCE_VERT2:  DrawTrackFence_NS_2(ti);  break;
    01554     case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti);  break;
    01555     case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti);  break;
    01556     case RAIL_GROUND_WATER: {
    01557       Corner track_corner;
    01558       if (IsHalftileSlope(ti->tileh)) {
    01559         /* Steep slope or one-corner-raised slope with halftile foundation */
    01560         track_corner = GetHalftileSlopeCorner(ti->tileh);
    01561       } else {
    01562         /* Three-corner-raised slope */
    01563         track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    01564       }
    01565       switch (track_corner) {
    01566         case CORNER_W: DrawTrackFence_NS_1(ti); break;
    01567         case CORNER_S: DrawTrackFence_WE_2(ti); break;
    01568         case CORNER_E: DrawTrackFence_NS_2(ti); break;
    01569         case CORNER_N: DrawTrackFence_WE_1(ti); break;
    01570         default: NOT_REACHED();
    01571       }
    01572       break;
    01573     }
    01574     default: break;
    01575   }
    01576 }
    01577
    01578
    01584 static void DrawTrackBits(TileInfo* ti, TrackBits track)
    01585 {
    01586   /* SubSprite for drawing the track halftile of 'three-corners-raised'-sloped rail sprites. */
    01587   static const int INF = 1000; // big number compared to tilesprite size
    01588   static const SubSprite _halftile_sub_sprite[4] = {
    01589     { -INF    , -INF  , 32 - 33, INF     }, // CORNER_W, clip 33 pixels from right
    01590     { -INF    ,  0 + 7, INF    , INF     }, // CORNER_S, clip 7 pixels from top
    01591     { -31 + 33, -INF  , INF    , INF     }, // CORNER_E, clip 33 pixels from left
    01592     { -INF    , -INF  , INF    , 30 - 23 }  // CORNER_N, clip 23 pixels from bottom
    01593   };
    01594
    01595   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    01596   RailGroundType rgt = GetRailGroundType(ti->tile);
    01597   Foundation f = GetRailFoundation(ti->tileh, track);
    01598   Corner halftile_corner = CORNER_INVALID;
    01599
    01600   if (IsNonContinuousFoundation(f)) {
    01601     /* Save halftile corner */
    01602     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
    01603     /* Draw lower part first */
    01604     track &= ~CornerToTrackBits(halftile_corner);
    01605     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
    01606   }
    01607
    01608   DrawFoundation(ti, f);
    01609   /* DrawFoundation modifies ti */
    01610
    01611   SpriteID image;
    01612   SpriteID pal = PAL_NONE;
    01613   const SubSprite *sub = NULL;
    01614   bool junction = false;
    01615
    01616   /* Select the sprite to use. */
    01617   if (track == 0) {
    01618     /* Clear ground (only track on halftile foundation) */
    01619     if (rgt == RAIL_GROUND_WATER) {
    01620       if (IsSteepSlope(ti->tileh)) {
    01621         DrawShoreTile(ti->tileh);
    01622         image = 0;
    01623       } else {
    01624         image = SPR_FLAT_WATER_TILE;
    01625       }
    01626     } else {
    01627       switch (rgt) {
    01628         case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01629         case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOWY_TILE; break;
    01630         default:                     image = SPR_FLAT_GRASS_TILE; break;
    01631       }
    01632       image += _tileh_to_sprite[ti->tileh];
    01633     }
    01634   } else {
    01635     if (ti->tileh != SLOPE_FLAT) {
    01636       /* track on non-flat ground */
    01637       image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
    01638     } else {
    01639       /* track on flat ground */
    01640       (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
    01641       (image++,                           track == TRACK_BIT_X) ||
    01642       (image++,                           track == TRACK_BIT_UPPER) ||
    01643       (image++,                           track == TRACK_BIT_LOWER) ||
    01644       (image++,                           track == TRACK_BIT_RIGHT) ||
    01645       (image++,                           track == TRACK_BIT_LEFT) ||
    01646       (image++,                           track == TRACK_BIT_CROSS) ||
    01647
    01648       (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
    01649       (image++,                            track == TRACK_BIT_VERT) ||
    01650
    01651       (junction = true, false) ||
    01652       (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
    01653       (image++,                          (track & TRACK_BIT_3WAY_SW) == 0) ||
    01654       (image++,                          (track & TRACK_BIT_3WAY_NW) == 0) ||
    01655       (image++,                          (track & TRACK_BIT_3WAY_SE) == 0) ||
    01656       (image++, true);
    01657     }
    01658
    01659     switch (rgt) {
    01660       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    01661       case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset;  break;
    01662       case RAIL_GROUND_WATER: {
    01663         /* three-corner-raised slope */
    01664         DrawShoreTile(ti->tileh);
    01665         Corner track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    01666         sub = &(_halftile_sub_sprite[track_corner]);
    01667         break;
    01668       }
    01669       default: break;
    01670     }
    01671   }
    01672
    01673   if (image != 0) DrawGroundSprite(image, pal, sub);
    01674
    01675   /* Draw track pieces individually for junction tiles */
    01676   if (junction) {
    01677     if (track & TRACK_BIT_X)     DrawGroundSprite(rti->base_sprites.single_y, PAL_NONE);
    01678     if (track & TRACK_BIT_Y)     DrawGroundSprite(rti->base_sprites.single_x, PAL_NONE);
    01679     if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PAL_NONE);
    01680     if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PAL_NONE);
    01681     if (track & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PAL_NONE);
    01682     if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PAL_NONE);
    01683   }
    01684
    01685   if (IsValidCorner(halftile_corner)) {
    01686     DrawFoundation(ti, HalftileFoundation(halftile_corner));
    01687
    01688     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
    01689     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    01690     image = _track_sloped_sprites[fake_slope - 1] + rti->base_sprites.track_y;
    01691     pal = PAL_NONE;
    01692     switch (rgt) {
    01693       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    01694       case RAIL_GROUND_ICE_DESERT:
    01695       case RAIL_GROUND_HALF_SNOW:  image += rti->snow_offset;  break; // higher part has snow in this case too
    01696       default: break;
    01697     }
    01698     DrawGroundSprite(image, pal, &(_halftile_sub_sprite[halftile_corner]));
    01699   }
    01700 }
    01701
    01707 enum {
    01708   SIGNAL_TO_SOUTHWEST =  0,
    01709   SIGNAL_TO_NORTHEAST =  2,
    01710   SIGNAL_TO_SOUTHEAST =  4,
    01711   SIGNAL_TO_NORTHWEST =  6,
    01712   SIGNAL_TO_EAST      =  8,
    01713   SIGNAL_TO_WEST      = 10,
    01714   SIGNAL_TO_SOUTH     = 12,
    01715   SIGNAL_TO_NORTH     = 14,
    01716 };
    01717
    01718 static void DrawSignals(TileIndex tile, TrackBits rails)
    01719 {
    01720 #define MAYBE_DRAW_SIGNAL(x,y,z,t) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, t, GetSingleSignalState(tile, x), y, z)
    01721
    01722   if (!(rails & TRACK_BIT_Y)) {
    01723     if (!(rails & TRACK_BIT_X)) {
    01724       if (rails & TRACK_BIT_LEFT) {
    01725         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTH, 0, TRACK_LEFT);
    01726         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTH, 1, TRACK_LEFT);
    01727       }
    01728       if (rails & TRACK_BIT_RIGHT) {
    01729         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_NORTH, 2, TRACK_RIGHT);
    01730         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_SOUTH, 3, TRACK_RIGHT);
    01731       }
    01732       if (rails & TRACK_BIT_UPPER) {
    01733         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_WEST, 4, TRACK_UPPER);
    01734         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_EAST, 5, TRACK_UPPER);
    01735       }
    01736       if (rails & TRACK_BIT_LOWER) {
    01737         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_WEST, 6, TRACK_LOWER);
    01738         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_EAST, 7, TRACK_LOWER);
    01739       }
    01740     } else {
    01741       MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHWEST, 8, TRACK_X);
    01742       MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHEAST, 9, TRACK_X);
    01743     }
    01744   } else {
    01745     MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHEAST, 10, TRACK_Y);
    01746     MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHWEST, 11, TRACK_Y);
    01747   }
    01748 }
    01749
    01750 static void DrawTile_Track(TileInfo *ti)
    01751 {
    01752   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    01753   SpriteID image;
    01754
    01755   _drawtile_track_palette = PLAYER_SPRITE_COLOR(GetTileOwner(ti->tile));
    01756
    01757   if (IsPlainRailTile(ti->tile)) {
    01758     TrackBits rails = GetTrackBits(ti->tile);
    01759
    01760     DrawTrackBits(ti, rails);
    01761
    01762     if (HasBit(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti);
    01763
    01764     if (GetRailType(ti->tile) == RAILTYPE_ELECTRIC) DrawCatenary(ti);
    01765
    01766     if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
    01767   } else {
    01768     /* draw depot/waypoint */
    01769     const DrawTileSprites* dts;
    01770     const DrawTileSeqStruct* dtss;
    01771     uint32 relocation;
    01772
    01773     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
    01774
    01775     if (IsRailDepot(ti->tile)) {
    01776       dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
    01777
    01778       relocation = rti->total_offset;
    01779
    01780       image = dts->ground.sprite;
    01781       if (image != SPR_FLAT_GRASS_TILE) image += rti->total_offset;
    01782
    01783       /* adjust ground tile for desert
    01784        * don't adjust for snow, because snow in depots looks weird */
    01785       if (IsSnowRailGround(ti->tile) && _opt.landscape == LT_TROPIC) {
    01786         if (image != SPR_FLAT_GRASS_TILE) {
    01787           image += rti->snow_offset; // tile with tracks
    01788         } else {
    01789           image = SPR_FLAT_SNOWY_TILE; // flat ground
    01790         }
    01791       }
    01792     } else {
    01793       /* look for customization */
    01794       byte stat_id = GetWaypointByTile(ti->tile)->stat_id;
    01795       const StationSpec *statspec = GetCustomStationSpec(STAT_CLASS_WAYP, stat_id);
    01796
    01797       if (statspec != NULL) {
    01798         /* emulate station tile - open with building */
    01799         const Station* st = ComposeWaypointStation(ti->tile);
    01800         uint gfx = 2;
    01801
    01802         if (HasBit(statspec->callbackmask, CBM_STATION_SPRITE_LAYOUT)) {
    01803           uint16 callback = GetStationCallback(CBID_STATION_SPRITE_LAYOUT, 0, 0, statspec, st, ti->tile);
    01804           if (callback != CALLBACK_FAILED) gfx = callback;
    01805         }
    01806
    01807         if (statspec->renderdata == NULL) {
    01808           dts = GetStationTileLayout(STATION_RAIL, gfx);
    01809         } else {
    01810           dts = &statspec->renderdata[(gfx < statspec->tiles ? gfx : 0) + GetWaypointAxis(ti->tile)];
    01811         }
    01812
    01813         if (dts != NULL && dts->seq != NULL) {
    01814           relocation = GetCustomStationRelocation(statspec, st, ti->tile);
    01815
    01816           image = dts->ground.sprite;
    01817           if (HasBit(image, SPRITE_MODIFIER_USE_OFFSET)) {
    01818             image += GetCustomStationGroundRelocation(statspec, st, ti->tile);
    01819             image += rti->custom_ground_offset;
    01820           } else {
    01821             image += rti->total_offset;
    01822           }
    01823         } else {
    01824           goto default_waypoint;
    01825         }
    01826       } else {
    01827 default_waypoint:
    01828         /* There is no custom layout, fall back to the default graphics */
    01829         dts = &_waypoint_gfx_table[GetWaypointAxis(ti->tile)];
    01830         relocation = 0;
    01831         image = dts->ground.sprite + rti->total_offset;
    01832         if (IsSnowRailGround(ti->tile)) image += rti->snow_offset;
    01833       }
    01834     }
    01835
    01836     DrawGroundSprite(image, PAL_NONE);
    01837
    01838     if (GetRailType(ti->tile) == RAILTYPE_ELECTRIC) DrawCatenary(ti);
    01839
    01840     foreach_draw_tile_seq(dtss, dts->seq) {
    01841       SpriteID image = dtss->image.sprite;
    01842       SpriteID pal;
    01843
    01844       /* Unlike stations, our default waypoint has no variation for
    01845        * different railtype, so don't use the railtype offset if
    01846        * no relocation is set */
    01847       if (HasBit(image, SPRITE_MODIFIER_USE_OFFSET)) {
    01848         image += rti->total_offset;
    01849       } else {
    01850         image += relocation;
    01851       }
    01852
    01853       if (!(!HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(TO_BUILDINGS)) && HasBit(image, PALETTE_MODIFIER_COLOR)) {
    01854         pal = _drawtile_track_palette;
    01855       } else {
    01856         pal = dtss->image.pal;
    01857       }
    01858
    01859       if ((byte)dtss->delta_z != 0x80) {
    01860         AddSortableSpriteToDraw(
    01861           image, pal,
    01862           ti->x + dtss->delta_x, ti->y + dtss->delta_y,
    01863           dtss->size_x, dtss->size_y,
    01864           dtss->size_z, ti->z + dtss->delta_z,
    01865           !HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(TO_BUILDINGS)
    01866         );
    01867       } else {
    01868         AddChildSpriteScreen(image, pal, dtss->delta_x, dtss->delta_y);
    01869       }
    01870     }
    01871   }
    01872   DrawBridgeMiddle(ti);
    01873 }
    01874
    01875
    01876 static void DrawTileSequence(int x, int y, SpriteID ground, const DrawTileSeqStruct* dtss, uint32 offset)
    01877 {
    01878   SpriteID palette = PLAYER_SPRITE_COLOR(_local_player);
    01879
    01880   DrawSprite(ground, PAL_NONE, x, y);
    01881   for (; dtss->image.sprite != 0; dtss++) {
    01882     Point pt = RemapCoords(dtss->delta_x, dtss->delta_y, dtss->delta_z);
    01883     SpriteID image = dtss->image.sprite + offset;
    01884
    01885     DrawSprite(image, HasBit(image, PALETTE_MODIFIER_COLOR) ? palette : PAL_NONE, x + pt.x, y + pt.y);
    01886   }
    01887 }
    01888
    01889 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
    01890 {
    01891   const DrawTileSprites* dts = &_depot_gfx_table[dir];
    01892   SpriteID image = dts->ground.sprite;
    01893   uint32 offset = GetRailTypeInfo(railtype)->total_offset;
    01894
    01895   if (image != SPR_FLAT_GRASS_TILE) image += offset;
    01896   DrawTileSequence(x + 33, y + 17, image, dts->seq, offset);
    01897 }
    01898
    01899 void DrawDefaultWaypointSprite(int x, int y, RailType railtype)
    01900 {
    01901   uint32 offset = GetRailTypeInfo(railtype)->total_offset;
    01902   const DrawTileSprites* dts = &_waypoint_gfx_table[AXIS_X];
    01903
    01904   DrawTileSequence(x, y, dts->ground.sprite + offset, dts->seq, 0);
    01905 }
    01906
    01907 static uint GetSlopeZ_Track(TileIndex tile, uint x, uint y)
    01908 {
    01909   uint z;
    01910   Slope tileh = GetTileSlope(tile, &z);
    01911
    01912   if (tileh == SLOPE_FLAT) return z;
    01913   if (IsPlainRailTile(tile)) {
    01914     z += ApplyFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
    01915     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
    01916   } else {
    01917     return z + TILE_HEIGHT;
    01918   }
    01919 }
    01920
    01921 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
    01922 {
    01923   return IsPlainRailTile(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
    01924 }
    01925
    01926 static void GetAcceptedCargo_Track(TileIndex tile, AcceptedCargo ac)
    01927 {
    01928   /* not used */
    01929 }
    01930
    01931 static void AnimateTile_Track(TileIndex tile)
    01932 {
    01933   /* not used */
    01934 }
    01935
    01936 static void TileLoop_Track(TileIndex tile)
    01937 {
    01938   RailGroundType old_ground = GetRailGroundType(tile);
    01939   RailGroundType new_ground;
    01940
    01941   if (old_ground == RAIL_GROUND_WATER) {
    01942     TileLoop_Water(tile);
    01943     return;
    01944   }
    01945
    01946   switch (_opt.landscape) {
    01947     case LT_ARCTIC: {
    01948       uint z;
    01949       Slope slope = GetTileSlope(tile, &z);
    01950       bool half = false;
    01951
    01952       /* for non-flat track, use lower part of track
    01953        * in other cases, use the highest part with track */
    01954       if (IsPlainRailTile(tile)) {
    01955         TrackBits track = GetTrackBits(tile);
    01956         Foundation f = GetRailFoundation(slope, track);
    01957
    01958         switch (f) {
    01959           case FOUNDATION_NONE:
    01960             /* no foundation - is the track on the upper side of three corners raised tile? */
    01961             if (IsSlopeWithThreeCornersRaised(slope)) z += TILE_HEIGHT;
    01962             break;
    01963
    01964           case FOUNDATION_INCLINED_X:
    01965           case FOUNDATION_INCLINED_Y:
    01966             /* sloped track - is it on a steep slope? */
    01967             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    01968             break;
    01969
    01970           case FOUNDATION_STEEP_LOWER:
    01971             /* only lower part of steep slope */
    01972             z += TILE_HEIGHT;
    01973             break;
    01974
    01975           default:
    01976             /* if it is a steep slope, then there is a track on higher part */
    01977             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
    01978             z += TILE_HEIGHT;
    01979             break;
    01980         }
    01981
    01982         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
    01983       } else {
    01984         /* is the depot on a non-flat tile? */
    01985         if (slope != SLOPE_FLAT) z += TILE_HEIGHT;
    01986       }
    01987
    01988       /* 'z' is now the lowest part of the highest track bit -
    01989        * for sloped track, it is 'z' of lower part
    01990        * for two track bits, it is 'z' of higher track bit
    01991        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
    01992       if (z > GetSnowLine()) {
    01993         if (half && z - GetSnowLine() == TILE_HEIGHT) {
    01994           /* track on non-continuous foundation, lower part is not under snow */
    01995           new_ground = RAIL_GROUND_HALF_SNOW;
    01996         } else {
    01997           new_ground = RAIL_GROUND_ICE_DESERT;
    01998         }
    01999         goto set_ground;
    02000       }
    02001       break;
    02002       }
    02003
    02004     case LT_TROPIC:
    02005       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
    02006         new_ground = RAIL_GROUND_ICE_DESERT;
    02007         goto set_ground;
    02008       }
    02009       break;
    02010   }
    02011
    02012   if (!IsPlainRailTile(tile)) return;
    02013
    02014   new_ground = RAIL_GROUND_GRASS;
    02015
    02016   if (old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
    02017     /* determine direction of fence */
    02018     TrackBits rail = GetTrackBits(tile);
    02019
    02020     switch (rail) {
    02021       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
    02022       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
    02023       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
    02024       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
    02025
    02026       default: {
    02027         PlayerID owner = GetTileOwner(tile);
    02028
    02029         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
    02030               (rail & TRACK_BIT_3WAY_NW) == 0 &&
    02031               (rail & TRACK_BIT_X)
    02032             )) {
    02033           TileIndex n = tile + TileDiffXY(0, -1);
    02034           TrackBits nrail = GetTrackBits(n);
    02035
    02036           if (!IsTileType(n, MP_RAILWAY) ||
    02037               !IsTileOwner(n, owner) ||
    02038               nrail == TRACK_BIT_UPPER ||
    02039               nrail == TRACK_BIT_LEFT) {
    02040             new_ground = RAIL_GROUND_FENCE_NW;
    02041           }
    02042         }
    02043
    02044         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
    02045               (rail & TRACK_BIT_3WAY_SE) == 0 &&
    02046               (rail & TRACK_BIT_X)
    02047             )) {
    02048           TileIndex n = tile + TileDiffXY(0, 1);
    02049           TrackBits nrail = GetTrackBits(n);
    02050
    02051           if (!IsTileType(n, MP_RAILWAY) ||
    02052               !IsTileOwner(n, owner) ||
    02053               nrail == TRACK_BIT_LOWER ||
    02054               nrail == TRACK_BIT_RIGHT) {
    02055             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
    02056               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
    02057           }
    02058         }
    02059
    02060         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
    02061               (rail & TRACK_BIT_3WAY_NE) == 0 &&
    02062               (rail & TRACK_BIT_Y)
    02063             )) {
    02064           TileIndex n = tile + TileDiffXY(-1, 0);
    02065           TrackBits nrail = GetTrackBits(n);
    02066
    02067           if (!IsTileType(n, MP_RAILWAY) ||
    02068               !IsTileOwner(n, owner) ||
    02069               nrail == TRACK_BIT_UPPER ||
    02070               nrail == TRACK_BIT_RIGHT) {
    02071             new_ground = RAIL_GROUND_FENCE_NE;
    02072           }
    02073         }
    02074
    02075         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
    02076               (rail & TRACK_BIT_3WAY_SW) == 0 &&
    02077               (rail & TRACK_BIT_Y)
    02078             )) {
    02079           TileIndex n = tile + TileDiffXY(1, 0);
    02080           TrackBits nrail = GetTrackBits(n);
    02081
    02082           if (!IsTileType(n, MP_RAILWAY) ||
    02083               !IsTileOwner(n, owner) ||
    02084               nrail == TRACK_BIT_LOWER ||
    02085               nrail == TRACK_BIT_LEFT) {
    02086             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
    02087               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
    02088           }
    02089         }
    02090         break;
    02091       }
    02092     }
    02093   }
    02094
    02095 set_ground:
    02096   if (old_ground != new_ground) {
    02097     SetRailGroundType(tile, new_ground);
    02098     MarkTileDirtyByTile(tile);
    02099   }
    02100 }
    02101
    02102
    02103 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
    02104 {
    02105   /* Case of half tile slope with water. */
    02106   if (mode == TRANSPORT_WATER && IsPlainRailTile(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
    02107     TrackBits tb = GetTrackBits(tile);
    02108     switch (tb) {
    02109       default: NOT_REACHED();
    02110       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
    02111       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
    02112       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
    02113       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
    02114     }
    02115     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
    02116   }
    02117
    02118   if (mode != TRANSPORT_RAIL) return 0;
    02119
    02120   TrackBits trackbits = TRACK_BIT_NONE;
    02121   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
    02122
    02123   switch (GetRailTileType(tile)) {
    02124     default: NOT_REACHED();
    02125     case RAIL_TILE_NORMAL:
    02126       trackbits = GetTrackBits(tile);
    02127       break;
    02128
    02129     case RAIL_TILE_SIGNALS: {
    02130       trackbits = GetTrackBits(tile);
    02131       byte a = GetPresentSignals(tile);
    02132       uint b = GetSignalStates(tile);
    02133
    02134       b &= a;
    02135
    02136       /* When signals are not present (in neither
    02137        * direction), we pretend them to be green. (So if
    02138        * signals are only one way, the other way will
    02139        * implicitely become `red' */
    02140       if ((a & 0xC) == 0) b |= 0xC;
    02141       if ((a & 0x3) == 0) b |= 0x3;
    02142
    02143       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
    02144       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
    02145       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
    02146       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
    02147
    02148       break;
    02149     }
    02150
    02151     case RAIL_TILE_DEPOT: {
    02152       DiagDirection dir = GetRailDepotDirection(tile);
    02153
    02154       if (side != INVALID_DIAGDIR && side != dir) break;
    02155
    02156       trackbits = AxisToTrackBits(DiagDirToAxis(dir));
    02157       break;
    02158     }
    02159
    02160     case RAIL_TILE_WAYPOINT:
    02161       trackbits = GetRailWaypointBits(tile);
    02162       break;
    02163   }
    02164
    02165   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
    02166 }
    02167
    02168 static void ClickTile_Track(TileIndex tile)
    02169 {
    02170   switch (GetRailTileType(tile)) {
    02171     case RAIL_TILE_DEPOT:    ShowDepotWindow(tile, VEH_TRAIN);                  break;
    02172     case RAIL_TILE_WAYPOINT: ShowRenameWaypointWindow(GetWaypointByTile(tile)); break;
    02173     default: break;
    02174   }
    02175 }
    02176
    02177 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
    02178 {
    02179   td->owner = GetTileOwner(tile);
    02180   switch (GetRailTileType(tile)) {
    02181     case RAIL_TILE_NORMAL:
    02182       td->str = STR_1021_RAILROAD_TRACK;
    02183       break;
    02184
    02185     case RAIL_TILE_SIGNALS: {
    02186       const StringID signal_type[4][4] = {
    02187         {
    02188           STR_RAILROAD_TRACK_WITH_NORMAL_SIGNALS,
    02189           STR_RAILROAD_TRACK_WITH_NORMAL_PRESIGNALS,
    02190           STR_RAILROAD_TRACK_WITH_NORMAL_EXITSIGNALS,
    02191           STR_RAILROAD_TRACK_WITH_NORMAL_COMBOSIGNALS
    02192         },
    02193         {
    02194           STR_RAILROAD_TRACK_WITH_NORMAL_PRESIGNALS,
    02195           STR_RAILROAD_TRACK_WITH_PRESIGNALS,
    02196           STR_RAILROAD_TRACK_WITH_PRE_EXITSIGNALS,
    02197           STR_RAILROAD_TRACK_WITH_PRE_COMBOSIGNALS
    02198         },
    02199         {
    02200           STR_RAILROAD_TRACK_WITH_NORMAL_EXITSIGNALS,
    02201           STR_RAILROAD_TRACK_WITH_PRE_EXITSIGNALS,
    02202           STR_RAILROAD_TRACK_WITH_EXITSIGNALS,
    02203           STR_RAILROAD_TRACK_WITH_EXIT_COMBOSIGNALS
    02204         },
    02205         {
    02206           STR_RAILROAD_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02207           STR_RAILROAD_TRACK_WITH_PRE_COMBOSIGNALS,
    02208           STR_RAILROAD_TRACK_WITH_EXIT_COMBOSIGNALS,
    02209           STR_RAILROAD_TRACK_WITH_COMBOSIGNALS
    02210         }
    02211       };
    02212
    02213       td->str = signal_type[GetSignalType(tile, TRACK_UPPER)][GetSignalType(tile, TRACK_LOWER)];
    02214       break;
    02215     }
    02216
    02217     case RAIL_TILE_DEPOT:
    02218       td->str = STR_1023_RAILROAD_TRAIN_DEPOT;
    02219       break;
    02220
    02221     case RAIL_TILE_WAYPOINT:
    02222     default:
    02223       td->str = STR_LANDINFO_WAYPOINT;
    02224       break;
    02225   }
    02226 }
    02227
    02228 static void ChangeTileOwner_Track(TileIndex tile, PlayerID old_player, PlayerID new_player)
    02229 {
    02230   if (!IsTileOwner(tile, old_player)) return;
    02231
    02232   if (new_player != PLAYER_SPECTATOR) {
    02233     SetTileOwner(tile, new_player);
    02234   } else {
    02235     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
    02236   }
    02237 }
    02238
    02239 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
    02240 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
    02241 static const signed char _deltacoord_leaveoffset[8] = {
    02242   -1,  0,  1,  0, /* x */
    02243    0,  1,  0, -1  /* y */
    02244 };
    02245
    02246
    02252 int TicksToLeaveDepot(const Vehicle *v)
    02253 {
    02254   DiagDirection dir = GetRailDepotDirection(v->tile);
    02255   int length = v->u.rail.cached_veh_length;
    02256
    02257   switch (dir) {
    02258     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
    02259     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
    02260     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
    02261     default:
    02262     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
    02263   }
    02264
    02265   return 0; // make compilers happy
    02266 }
    02267
    02268
    02269 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *v, TileIndex tile, int x, int y)
    02270 {
    02271   byte fract_coord;
    02272   byte fract_coord_leave;
    02273   DiagDirection dir;
    02274   int length;
    02275
    02276   /* this routine applies only to trains in depot tiles */
    02277   if (v->type != VEH_TRAIN || !IsTileDepotType(tile, TRANSPORT_RAIL)) return VETSB_CONTINUE;
    02278
    02279   /* depot direction */
    02280   dir = GetRailDepotDirection(tile);
    02281
    02282   /* calculate the point where the following wagon should be activated */
    02283   /* this depends on the length of the current vehicle */
    02284   length = v->u.rail.cached_veh_length;
    02285
    02286   fract_coord_leave =
    02287     ((_fractcoords_enter[dir] & 0x0F) + // x
    02288       (length + 1) * _deltacoord_leaveoffset[dir]) +
    02289     (((_fractcoords_enter[dir] >> 4) +  // y
    02290       ((length + 1) * _deltacoord_leaveoffset[dir+4])) << 4);
    02291
    02292   fract_coord = (x & 0xF) + ((y & 0xF) << 4);
    02293
    02294   if (_fractcoords_behind[dir] == fract_coord) {
    02295     /* make sure a train is not entering the tile from behind */
    02296     return VETSB_CANNOT_ENTER;
    02297   } else if (_fractcoords_enter[dir] == fract_coord) {
    02298     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
    02299       /* enter the depot */
    02300       v->u.rail.track = TRACK_BIT_DEPOT,
    02301       v->vehstatus |= VS_HIDDEN; /* hide it */
    02302       v->direction = ReverseDir(v->direction);
    02303       if (v->Next() == NULL) VehicleEnterDepot(v);
    02304       v->tile = tile;
    02305
    02306       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
    02307       return VETSB_ENTERED_WORMHOLE;
    02308     }
    02309   } else if (fract_coord_leave == fract_coord) {
    02310     if (DiagDirToDir(dir) == v->direction) {
    02311       /* leave the depot? */
    02312       if ((v = v->Next()) != NULL) {
    02313         v->vehstatus &= ~VS_HIDDEN;
    02314         v->u.rail.track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
    02315       }
    02316     }
    02317   }
    02318
    02319   return VETSB_CONTINUE;
    02320 }
    02321
    02333 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, uint z_old, Slope tileh_old, uint z_new, Slope tileh_new, TrackBits rail_bits)
    02334 {
    02335   if (!_patches.build_on_slopes || !AutoslopeEnabled()) return CMD_ERROR;
    02336
    02337   /* Is the slope-rail_bits combination valid in general? I.e. is it save to call GetRailFoundation() ? */
    02338   if (CmdFailed(CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile))) return CMD_ERROR;
    02339
    02340   /* Get the slopes on top of the foundations */
    02341   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
    02342   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
    02343
    02344   Corner track_corner;
    02345   switch (rail_bits) {
    02346     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
    02347     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
    02348     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
    02349     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
    02350
    02351     /* Surface slope must not be changed */
    02352     default: return (((z_old != z_new) || (tileh_old != tileh_new)) ? CMD_ERROR : CommandCost(EXPENSES_CONSTRUCTION, _price.terraform));
    02353   }
    02354
    02355   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
    02356   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
    02357   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
    02358   if (z_old != z_new) return CMD_ERROR;
    02359
    02360   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    02361   /* Make the ground dirty, if surface slope has changed */
    02362   if (tileh_old != tileh_new) {
    02363     /* If there is flat water on the lower halftile add the cost for clearing it */
    02364     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price.clear_water);
    02365     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02366   }
    02367   return  cost;
    02368 }
    02369
    02370 static CommandCost TerraformTile_Track(TileIndex tile, uint32 flags, uint z_new, Slope tileh_new)
    02371 {
    02372   uint z_old;
    02373   Slope tileh_old = GetTileSlope(tile, &z_old);
    02374   if (IsPlainRailTile(tile)) {
    02375     TrackBits rail_bits = GetTrackBits(tile);
    02376     /* Is there flat water on the lower halftile, that must be cleared expensively? */
    02377     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
    02378
    02379     _error_message = STR_1008_MUST_REMOVE_RAILROAD_TRACK;
    02380
    02381     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
    02382     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
    02383
    02384     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
    02385     Corner allowed_corner;
    02386     switch (rail_bits) {
    02387       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
    02388       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
    02389       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
    02390       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
    02391       default: return autoslope_result;
    02392     }
    02393
    02394     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
    02395
    02396     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
    02397     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
    02398
    02399     /* Everything is valid, which only changes allowed_corner */
    02400     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
    02401       if (allowed_corner == corner) continue;
    02402       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
    02403     }
    02404
    02405     /* Make the ground dirty */
    02406     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02407
    02408     /* allow terraforming */
    02409     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price.clear_water : (Money)0);
    02410   } else {
    02411     if (_patches.build_on_slopes && AutoslopeEnabled()) {
    02412       switch (GetRailTileType(tile)) {
    02413         case RAIL_TILE_WAYPOINT: {
    02414           CommandCost cost = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, GetRailWaypointBits(tile));
    02415           if (!CmdFailed(cost)) return cost; // allow autoslope
    02416           break;
    02417         }
    02418
    02419         case RAIL_TILE_DEPOT:
    02420           if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    02421           break;
    02422
    02423         default: NOT_REACHED();
    02424       }
    02425     }
    02426   }
    02427   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    02428 }
    02429
    02430
    02431 extern const TileTypeProcs _tile_type_rail_procs = {
    02432   DrawTile_Track,           /* draw_tile_proc */
    02433   GetSlopeZ_Track,          /* get_slope_z_proc */
    02434   ClearTile_Track,          /* clear_tile_proc */
    02435   GetAcceptedCargo_Track,   /* get_accepted_cargo_proc */
    02436   GetTileDesc_Track,        /* get_tile_desc_proc */
    02437   GetTileTrackStatus_Track, /* get_tile_track_status_proc */
    02438   ClickTile_Track,          /* click_tile_proc */
    02439   AnimateTile_Track,        /* animate_tile_proc */
    02440   TileLoop_Track,           /* tile_loop_clear */
    02441   ChangeTileOwner_Track,    /* change_tile_owner_clear */
    02442   NULL,                     /* get_produced_cargo_proc */
    02443   VehicleEnter_Track,       /* vehicle_enter_tile_proc */
    02444   GetFoundation_Track,      /* get_foundation_proc */
    02445   TerraformTile_Track,      /* terraform_tile_proc */
    02446 };