rail_cmd.cpp

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00001 /* $Id: rail_cmd.cpp 16744 2009-07-04 21:06:17Z rubidium $ */
00002 
00005 #include "stdafx.h"
00006 #include "openttd.h"
00007 #include "cmd_helper.h"
00008 #include "landscape.h"
00009 #include "town_map.h"
00010 #include "viewport_func.h"
00011 #include "command_func.h"
00012 #include "engine_base.h"
00013 #include "depot_base.h"
00014 #include "waypoint.h"
00015 #include "yapf/yapf.h"
00016 #include "newgrf_engine.h"
00017 #include "newgrf_station.h"
00018 #include "newgrf_commons.h"
00019 #include "train.h"
00020 #include "variables.h"
00021 #include "autoslope.h"
00022 #include "water.h"
00023 #include "tunnelbridge_map.h"
00024 #include "window_func.h"
00025 #include "vehicle_func.h"
00026 #include "sound_func.h"
00027 #include "tunnelbridge.h"
00028 #include "station_map.h"
00029 #include "functions.h"
00030 #include "elrail_func.h"
00031 
00032 #include "table/strings.h"
00033 #include "table/railtypes.h"
00034 #include "table/track_land.h"
00035 
00036 RailtypeInfo _railtypes[RAILTYPE_END];
00037 
00038 assert_compile(sizeof(_original_railtypes) <= sizeof(_railtypes));
00039 
00043 void ResetRailTypes()
00044 {
00045   memset(_railtypes, 0, sizeof(_railtypes));
00046   memcpy(_railtypes, _original_railtypes, sizeof(_original_railtypes));
00047 }
00048 
00049 const byte _track_sloped_sprites[14] = {
00050   14, 15, 22, 13,
00051    0, 21, 17, 12,
00052   23,  0, 18, 20,
00053   19, 16
00054 };
00055 
00056 
00057 /*         4
00058  *     ---------
00059  *    |\       /|
00060  *    | \    1/ |
00061  *    |  \   /  |
00062  *    |   \ /   |
00063  *  16|    \    |32
00064  *    |   / \2  |
00065  *    |  /   \  |
00066  *    | /     \ |
00067  *    |/       \|
00068  *     ---------
00069  *         8
00070  */
00071 
00072 
00073 
00074 /* MAP2 byte:    abcd???? => Signal On? Same coding as map3lo
00075  * MAP3LO byte:  abcd???? => Signal Exists?
00076  *               a and b are for diagonals, upper and left,
00077  *               one for each direction. (ie a == NE->SW, b ==
00078  *               SW->NE, or v.v., I don't know. b and c are
00079  *               similar for lower and right.
00080  * MAP2 byte:    ????abcd => Type of ground.
00081  * MAP3LO byte:  ????abcd => Type of rail.
00082  * MAP5:         00abcdef => rail
00083  *               01abcdef => rail w/ signals
00084  *               10uuuuuu => unused
00085  *               11uuuudd => rail depot
00086  */
00087 
00088 
00089 Vehicle *EnsureNoTrainOnTrackProc(Vehicle *v, void *data)
00090 {
00091   TrackBits rail_bits = *(TrackBits *)data;
00092 
00093   if (v->type != VEH_TRAIN) return NULL;
00094 
00095   if ((v->u.rail.track != rail_bits) && !TracksOverlap(v->u.rail.track | rail_bits)) return NULL;
00096 
00097   _error_message = VehicleInTheWayErrMsg(v);
00098   return v;
00099 }
00100 
00108 static bool EnsureNoTrainOnTrack(TileIndex tile, Track track)
00109 {
00110   TrackBits rail_bits = TrackToTrackBits(track);
00111 
00112   return !HasVehicleOnPos(tile, &rail_bits, &EnsureNoTrainOnTrackProc);
00113 }
00114 
00115 static bool CheckTrackCombination(TileIndex tile, TrackBits to_build, uint flags)
00116 {
00117   TrackBits current; // The current track layout
00118   TrackBits future;  // The track layout we want to build
00119   _error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;
00120 
00121   if (!IsPlainRailTile(tile)) return false;
00122 
00123   /* So, we have a tile with tracks on it (and possibly signals). Let's see
00124    * what tracks first */
00125   current = GetTrackBits(tile);
00126   future = current | to_build;
00127 
00128   /* Are we really building something new? */
00129   if (current == future) {
00130     /* Nothing new is being built */
00131     _error_message = STR_1007_ALREADY_BUILT;
00132     return false;
00133   }
00134 
00135   /* Let's see if we may build this */
00136   if (flags & DC_NO_RAIL_OVERLAP || HasSignals(tile)) {
00137     /* If we are not allowed to overlap (flag is on for ai companies or we have
00138      * signals on the tile), check that */
00139     return future == TRACK_BIT_HORZ || future == TRACK_BIT_VERT;
00140   } else {
00141     /* Normally, we may overlap and any combination is valid */
00142     return true;
00143   }
00144 }
00145 
00146 
00148 static const TrackBits _valid_tracks_without_foundation[15] = {
00149   TRACK_BIT_ALL,
00150   TRACK_BIT_RIGHT,
00151   TRACK_BIT_UPPER,
00152   TRACK_BIT_X,
00153 
00154   TRACK_BIT_LEFT,
00155   TRACK_BIT_NONE,
00156   TRACK_BIT_Y,
00157   TRACK_BIT_LOWER,
00158 
00159   TRACK_BIT_LOWER,
00160   TRACK_BIT_Y,
00161   TRACK_BIT_NONE,
00162   TRACK_BIT_LEFT,
00163 
00164   TRACK_BIT_X,
00165   TRACK_BIT_UPPER,
00166   TRACK_BIT_RIGHT,
00167 };
00168 
00170 static const TrackBits _valid_tracks_on_leveled_foundation[15] = {
00171   TRACK_BIT_NONE,
00172   TRACK_BIT_LEFT,
00173   TRACK_BIT_LOWER,
00174   TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,
00175 
00176   TRACK_BIT_RIGHT,
00177   TRACK_BIT_ALL,
00178   TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,
00179   TRACK_BIT_ALL,
00180 
00181   TRACK_BIT_UPPER,
00182   TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,
00183   TRACK_BIT_ALL,
00184   TRACK_BIT_ALL,
00185 
00186   TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,
00187   TRACK_BIT_ALL,
00188   TRACK_BIT_ALL
00189 };
00190 
00198 Foundation GetRailFoundation(Slope tileh, TrackBits bits)
00199 {
00200   if (bits == TRACK_BIT_NONE) return FOUNDATION_NONE;
00201 
00202   if (IsSteepSlope(tileh)) {
00203     /* Test for inclined foundations */
00204     if (bits == TRACK_BIT_X) return FOUNDATION_INCLINED_X;
00205     if (bits == TRACK_BIT_Y) return FOUNDATION_INCLINED_Y;
00206 
00207     /* Get higher track */
00208     Corner highest_corner = GetHighestSlopeCorner(tileh);
00209     TrackBits higher_track = CornerToTrackBits(highest_corner);
00210 
00211     /* Only higher track? */
00212     if (bits == higher_track) return HalftileFoundation(highest_corner);
00213 
00214     /* Overlap with higher track? */
00215     if (TracksOverlap(bits | higher_track)) return FOUNDATION_INVALID;
00216 
00217     /* either lower track or both higher and lower track */
00218     return ((bits & higher_track) != 0 ? FOUNDATION_STEEP_BOTH : FOUNDATION_STEEP_LOWER);
00219   } else {
00220     if ((~_valid_tracks_without_foundation[tileh] & bits) == 0) return FOUNDATION_NONE;
00221 
00222     bool valid_on_leveled = ((~_valid_tracks_on_leveled_foundation[tileh] & bits) == 0);
00223 
00224     Corner track_corner;
00225     switch (bits) {
00226       case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
00227       case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
00228       case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
00229       case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
00230 
00231       case TRACK_BIT_HORZ:
00232         if (tileh == SLOPE_N) return HalftileFoundation(CORNER_N);
00233         if (tileh == SLOPE_S) return HalftileFoundation(CORNER_S);
00234         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00235 
00236       case TRACK_BIT_VERT:
00237         if (tileh == SLOPE_W) return HalftileFoundation(CORNER_W);
00238         if (tileh == SLOPE_E) return HalftileFoundation(CORNER_E);
00239         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00240 
00241       case TRACK_BIT_X:
00242         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_X;
00243         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00244 
00245       case TRACK_BIT_Y:
00246         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_Y;
00247         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00248 
00249       default:
00250         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00251     }
00252     /* Single diagonal track */
00253 
00254     /* Track must be at least valid on leveled foundation */
00255     if (!valid_on_leveled) return FOUNDATION_INVALID;
00256 
00257     /* If slope has three raised corners, build leveled foundation */
00258     if (IsSlopeWithThreeCornersRaised(tileh)) return FOUNDATION_LEVELED;
00259 
00260     /* If neighboured corners of track_corner are lowered, build halftile foundation */
00261     if ((tileh & SlopeWithThreeCornersRaised(OppositeCorner(track_corner))) == SlopeWithOneCornerRaised(track_corner)) return HalftileFoundation(track_corner);
00262 
00263     /* else special anti-zig-zag foundation */
00264     return SpecialRailFoundation(track_corner);
00265   }
00266 }
00267 
00268 
00278 static CommandCost CheckRailSlope(Slope tileh, TrackBits rail_bits, TrackBits existing, TileIndex tile)
00279 {
00280   /* don't allow building on the lower side of a coast */
00281   if (IsTileType(tile, MP_WATER) || (IsTileType(tile, MP_RAILWAY) && (GetRailGroundType(tile) == RAIL_GROUND_WATER))) {
00282     if (!IsSteepSlope(tileh) && ((~_valid_tracks_on_leveled_foundation[tileh] & (rail_bits | existing)) != 0)) return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);
00283   }
00284 
00285   Foundation f_new = GetRailFoundation(tileh, rail_bits | existing);
00286 
00287   /* check track/slope combination */
00288   if ((f_new == FOUNDATION_INVALID) ||
00289       ((f_new != FOUNDATION_NONE) && (!_settings_game.construction.build_on_slopes))) {
00290     return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
00291   }
00292 
00293   Foundation f_old = GetRailFoundation(tileh, existing);
00294   return CommandCost(EXPENSES_CONSTRUCTION, f_new != f_old ? _price.terraform : (Money)0);
00295 }
00296 
00297 /* Validate functions for rail building */
00298 static inline bool ValParamTrackOrientation(Track track) {return IsValidTrack(track);}
00299 
00306 CommandCost CmdBuildSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00307 {
00308   Slope tileh;
00309   RailType railtype = (RailType)p1;
00310   Track track = (Track)p2;
00311   TrackBits trackbit;
00312   CommandCost cost(EXPENSES_CONSTRUCTION);
00313   CommandCost ret;
00314 
00315   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
00316 
00317   tileh = GetTileSlope(tile, NULL);
00318   trackbit = TrackToTrackBits(track);
00319 
00320   switch (GetTileType(tile)) {
00321     case MP_RAILWAY:
00322       if (!CheckTileOwnership(tile)) return CMD_ERROR;
00323 
00324       if (!IsPlainRailTile(tile)) return CMD_ERROR;
00325 
00326       if (!IsCompatibleRail(GetRailType(tile), railtype)) return_cmd_error(STR_1001_IMPOSSIBLE_TRACK_COMBINATION);
00327 
00328       if (!CheckTrackCombination(tile, trackbit, flags) ||
00329           !EnsureNoTrainOnTrack(tile, track)) {
00330         return CMD_ERROR;
00331       }
00332 
00333       ret = CheckRailSlope(tileh, trackbit, GetTrackBits(tile), tile);
00334       if (CmdFailed(ret)) return ret;
00335       cost.AddCost(ret);
00336 
00337       /* If the rail types don't match, try to convert only if engines of
00338        * the new rail type are not powered on the present rail type and engines of
00339        * the present rail type are powered on the new rail type. */
00340       if (GetRailType(tile) != railtype && !HasPowerOnRail(railtype, GetRailType(tile))) {
00341         if (HasPowerOnRail(GetRailType(tile), railtype)) {
00342           ret = DoCommand(tile, tile, railtype, flags, CMD_CONVERT_RAIL);
00343           if (CmdFailed(ret)) return ret;
00344           cost.AddCost(ret);
00345         } else {
00346           return CMD_ERROR;
00347         }
00348       }
00349 
00350       if (flags & DC_EXEC) {
00351         SetRailGroundType(tile, RAIL_GROUND_BARREN);
00352         SetTrackBits(tile, GetTrackBits(tile) | trackbit);
00353       }
00354       break;
00355 
00356     case MP_ROAD:
00357 #define M(x) (1 << (x))
00358       /* Level crossings may only be built on these slopes */
00359       if (!HasBit(M(SLOPE_SEN) | M(SLOPE_ENW) | M(SLOPE_NWS) | M(SLOPE_NS) | M(SLOPE_WSE) | M(SLOPE_EW) | M(SLOPE_FLAT), tileh)) {
00360         return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
00361       }
00362 #undef M
00363 
00364       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00365 
00366       if (IsNormalRoad(tile)) {
00367         if (HasRoadWorks(tile)) return_cmd_error(STR_ROAD_WORKS_IN_PROGRESS);
00368 
00369         if (GetDisallowedRoadDirections(tile) != DRD_NONE) return_cmd_error(STR_ERR_CROSSING_ON_ONEWAY_ROAD);
00370 
00371         RoadTypes roadtypes = GetRoadTypes(tile);
00372         RoadBits road = GetRoadBits(tile, ROADTYPE_ROAD);
00373         RoadBits tram = GetRoadBits(tile, ROADTYPE_TRAM);
00374         switch (roadtypes) {
00375           default: break;
00376           case ROADTYPES_TRAM:
00377             /* Tram crossings must always have road. */
00378             if (flags & DC_EXEC) SetRoadOwner(tile, ROADTYPE_ROAD, _current_company);
00379             roadtypes |= ROADTYPES_ROAD;
00380             break;
00381 
00382           case ROADTYPES_ALL:
00383             if (road != tram) return CMD_ERROR;
00384             break;
00385         }
00386 
00387         road |= tram;
00388 
00389         if ((track == TRACK_X && road == ROAD_Y) ||
00390             (track == TRACK_Y && road == ROAD_X)) {
00391           if (flags & DC_EXEC) {
00392             MakeRoadCrossing(tile, GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), _current_company, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, roadtypes, GetTownIndex(tile));
00393             UpdateLevelCrossing(tile, false);
00394           }
00395           break;
00396         }
00397       }
00398 
00399       if (IsLevelCrossing(tile) && GetCrossingRailBits(tile) == trackbit) {
00400         return_cmd_error(STR_1007_ALREADY_BUILT);
00401       }
00402       /* FALLTHROUGH */
00403 
00404     default:
00405       /* Will there be flat water on the lower halftile? */
00406       bool water_ground = IsTileType(tile, MP_WATER) && IsSlopeWithOneCornerRaised(tileh);
00407 
00408       ret = CheckRailSlope(tileh, trackbit, TRACK_BIT_NONE, tile);
00409       if (CmdFailed(ret)) return ret;
00410       cost.AddCost(ret);
00411 
00412       ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00413       if (CmdFailed(ret)) return ret;
00414       cost.AddCost(ret);
00415 
00416       if (water_ground) {
00417         cost.AddCost(-_price.clear_water);
00418         cost.AddCost(_price.clear_roughland);
00419       }
00420 
00421       if (flags & DC_EXEC) {
00422         MakeRailNormal(tile, _current_company, trackbit, railtype);
00423         if (water_ground) SetRailGroundType(tile, RAIL_GROUND_WATER);
00424       }
00425       break;
00426   }
00427 
00428   if (flags & DC_EXEC) {
00429     MarkTileDirtyByTile(tile);
00430     AddTrackToSignalBuffer(tile, track, _current_company);
00431     YapfNotifyTrackLayoutChange(tile, track);
00432   }
00433 
00434   return cost.AddCost(RailBuildCost(railtype));
00435 }
00436 
00443 CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00444 {
00445   Track track = (Track)p2;
00446   TrackBits trackbit;
00447   CommandCost cost(EXPENSES_CONSTRUCTION, _price.remove_rail );
00448   bool crossing = false;
00449 
00450   if (!ValParamTrackOrientation((Track)p2)) return CMD_ERROR;
00451   trackbit = TrackToTrackBits(track);
00452 
00453   /* Need to read tile owner now because it may change when the rail is removed
00454    * Also, in case of floods, _current_company != owner
00455    * There may be invalid tiletype even in exec run (when removing long track),
00456    * so do not call GetTileOwner(tile) in any case here */
00457   Owner owner = INVALID_OWNER;
00458 
00459   Vehicle *v = NULL;
00460 
00461   switch (GetTileType(tile)) {
00462     case MP_ROAD: {
00463       if (!IsLevelCrossing(tile) ||
00464           GetCrossingRailBits(tile) != trackbit ||
00465           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
00466           (!(flags & DC_BANKRUPT) && !EnsureNoVehicleOnGround(tile))) {
00467         return CMD_ERROR;
00468       }
00469 
00470       if (flags & DC_EXEC) {
00471         if (HasReservedTracks(tile, trackbit)) {
00472           v = GetTrainForReservation(tile, track);
00473           if (v != NULL) FreeTrainTrackReservation(v);
00474         }
00475         owner = GetTileOwner(tile);
00476         MakeRoadNormal(tile, GetCrossingRoadBits(tile), GetRoadTypes(tile), GetTownIndex(tile), GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM));
00477       }
00478       break;
00479     }
00480 
00481     case MP_RAILWAY: {
00482       TrackBits present;
00483 
00484       if (!IsPlainRailTile(tile) ||
00485           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
00486           !EnsureNoTrainOnTrack(tile, track)) {
00487         return CMD_ERROR;
00488       }
00489 
00490       present = GetTrackBits(tile);
00491       if ((present & trackbit) == 0) return CMD_ERROR;
00492       if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
00493 
00494       /* Charge extra to remove signals on the track, if they are there */
00495       if (HasSignalOnTrack(tile, track))
00496         cost.AddCost(DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS));
00497 
00498       if (flags & DC_EXEC) {
00499         if (HasReservedTracks(tile, trackbit)) {
00500           v = GetTrainForReservation(tile, track);
00501           if (v != NULL) FreeTrainTrackReservation(v);
00502         }
00503         owner = GetTileOwner(tile);
00504         present ^= trackbit;
00505         if (present == 0) {
00506           Slope tileh = GetTileSlope(tile, NULL);
00507           /* If there is flat water on the lower halftile, convert the tile to shore so the water remains */
00508           if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh)) {
00509             MakeShore(tile);
00510           } else {
00511             DoClearSquare(tile);
00512           }
00513         } else {
00514           SetTrackBits(tile, present);
00515           SetTrackReservation(tile, GetTrackReservation(tile) & present);
00516         }
00517       }
00518       break;
00519     }
00520 
00521     default: return CMD_ERROR;
00522   }
00523 
00524   if (flags & DC_EXEC) {
00525     /* if we got that far, 'owner' variable is set correctly */
00526     assert(IsValidCompanyID(owner));
00527 
00528     MarkTileDirtyByTile(tile);
00529     if (crossing) {
00530       /* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we
00531        * are removing one of these pieces, we'll need to update signals for
00532        * both directions explicitly, as after the track is removed it won't
00533        * 'connect' with the other piece. */
00534       AddTrackToSignalBuffer(tile, TRACK_X, owner);
00535       AddTrackToSignalBuffer(tile, TRACK_Y, owner);
00536       YapfNotifyTrackLayoutChange(tile, TRACK_X);
00537       YapfNotifyTrackLayoutChange(tile, TRACK_Y);
00538     } else {
00539       AddTrackToSignalBuffer(tile, track, owner);
00540       YapfNotifyTrackLayoutChange(tile, track);
00541     }
00542 
00543     if (v != NULL) TryPathReserve(v, true);
00544   }
00545 
00546   return cost;
00547 }
00548 
00549 
00557 bool FloodHalftile(TileIndex t)
00558 {
00559   assert(IsPlainRailTile(t));
00560 
00561   bool flooded = false;
00562   if (GetRailGroundType(t) == RAIL_GROUND_WATER) return flooded;
00563 
00564   Slope tileh = GetTileSlope(t, NULL);
00565   TrackBits rail_bits = GetTrackBits(t);
00566 
00567   if (IsSlopeWithOneCornerRaised(tileh)) {
00568     TrackBits lower_track = CornerToTrackBits(OppositeCorner(GetHighestSlopeCorner(tileh)));
00569 
00570     TrackBits to_remove = lower_track & rail_bits;
00571     if (to_remove != 0) {
00572       _current_company = OWNER_WATER;
00573       if (CmdFailed(DoCommand(t, 0, FIND_FIRST_BIT(to_remove), DC_EXEC, CMD_REMOVE_SINGLE_RAIL))) return flooded; // not yet floodable
00574       flooded = true;
00575       rail_bits = rail_bits & ~to_remove;
00576       if (rail_bits == 0) {
00577         MakeShore(t);
00578         MarkTileDirtyByTile(t);
00579         return flooded;
00580       }
00581     }
00582 
00583     if (IsNonContinuousFoundation(GetRailFoundation(tileh, rail_bits))) {
00584       flooded = true;
00585       SetRailGroundType(t, RAIL_GROUND_WATER);
00586       MarkTileDirtyByTile(t);
00587     }
00588   } else {
00589     /* Make shore on steep slopes and 'three-corners-raised'-slopes. */
00590     if (ApplyFoundationToSlope(GetRailFoundation(tileh, rail_bits), &tileh) == 0) {
00591       if (IsSteepSlope(tileh) || IsSlopeWithThreeCornersRaised(tileh)) {
00592         flooded = true;
00593         SetRailGroundType(t, RAIL_GROUND_WATER);
00594         MarkTileDirtyByTile(t);
00595       }
00596     }
00597   }
00598   return flooded;
00599 }
00600 
00601 static const TileIndexDiffC _trackdelta[] = {
00602   { -1,  0 }, {  0,  1 }, { -1,  0 }, {  0,  1 }, {  1,  0 }, {  0,  1 },
00603   {  0,  0 },
00604   {  0,  0 },
00605   {  1,  0 }, {  0, -1 }, {  0, -1 }, {  1,  0 }, {  0, -1 }, { -1,  0 },
00606   {  0,  0 },
00607   {  0,  0 }
00608 };
00609 
00610 
00611 static CommandCost ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)
00612 {
00613   int x = TileX(start);
00614   int y = TileY(start);
00615   int ex = TileX(end);
00616   int ey = TileY(end);
00617   int dx, dy, trdx, trdy;
00618 
00619   if (!ValParamTrackOrientation(TrackdirToTrack(*trackdir))) return CMD_ERROR;
00620 
00621   /* calculate delta x,y from start to end tile */
00622   dx = ex - x;
00623   dy = ey - y;
00624 
00625   /* calculate delta x,y for the first direction */
00626   trdx = _trackdelta[*trackdir].x;
00627   trdy = _trackdelta[*trackdir].y;
00628 
00629   if (!IsDiagonalTrackdir(*trackdir)) {
00630     trdx += _trackdelta[*trackdir ^ 1].x;
00631     trdy += _trackdelta[*trackdir ^ 1].y;
00632   }
00633 
00634   /* validate the direction */
00635   while (
00636     (trdx <= 0 && dx > 0) ||
00637     (trdx >= 0 && dx < 0) ||
00638     (trdy <= 0 && dy > 0) ||
00639     (trdy >= 0 && dy < 0)
00640   ) {
00641     if (!HasBit(*trackdir, 3)) { // first direction is invalid, try the other
00642       SetBit(*trackdir, 3); // reverse the direction
00643       trdx = -trdx;
00644       trdy = -trdy;
00645     } else { // other direction is invalid too, invalid drag
00646       return CMD_ERROR;
00647     }
00648   }
00649 
00650   /* (for diagonal tracks, this is already made sure of by above test), but:
00651    * for non-diagonal tracks, check if the start and end tile are on 1 line */
00652   if (!IsDiagonalTrackdir(*trackdir)) {
00653     trdx = _trackdelta[*trackdir].x;
00654     trdy = _trackdelta[*trackdir].y;
00655     if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx))
00656       return CMD_ERROR;
00657   }
00658 
00659   return CommandCost();
00660 }
00661 
00671 static CommandCost CmdRailTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00672 {
00673   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
00674   Track track = (Track)GB(p2, 4, 3);
00675   bool remove = HasBit(p2, 7);
00676   RailType railtype = (RailType)GB(p2, 0, 4);
00677 
00678   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
00679   if (p1 >= MapSize()) return CMD_ERROR;
00680   TileIndex end_tile = p1;
00681   Trackdir trackdir = TrackToTrackdir(track);
00682 
00683   if (CmdFailed(ValidateAutoDrag(&trackdir, tile, end_tile))) return CMD_ERROR;
00684 
00685   if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, tile);
00686 
00687   for (;;) {
00688     ret = DoCommand(tile, railtype, TrackdirToTrack(trackdir), flags, remove ? CMD_REMOVE_SINGLE_RAIL : CMD_BUILD_SINGLE_RAIL);
00689 
00690     if (CmdFailed(ret)) {
00691       if (_error_message != STR_1007_ALREADY_BUILT && !remove) break;
00692       _error_message = INVALID_STRING_ID;
00693     } else {
00694       total_cost.AddCost(ret);
00695     }
00696 
00697     if (tile == end_tile) break;
00698 
00699     tile += ToTileIndexDiff(_trackdelta[trackdir]);
00700 
00701     /* toggle railbit for the non-diagonal tracks */
00702     if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
00703   }
00704 
00705   return (total_cost.GetCost() == 0) ? CommandCost(remove ? INVALID_STRING_ID : (_error_message == INVALID_STRING_ID ? STR_1007_ALREADY_BUILT : _error_message)) : total_cost;
00706 }
00707 
00719 CommandCost CmdBuildRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00720 {
00721   return CmdRailTrackHelper(tile, flags, p1, ClrBit(p2, 7), text);
00722 }
00723 
00735 CommandCost CmdRemoveRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00736 {
00737   return CmdRailTrackHelper(tile, flags, p1, SetBit(p2, 7), text);
00738 }
00739 
00749 CommandCost CmdBuildTrainDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00750 {
00751   Slope tileh;
00752 
00753   /* check railtype and valid direction for depot (0 through 3), 4 in total */
00754   if (!ValParamRailtype((RailType)p1)) return CMD_ERROR;
00755 
00756   tileh = GetTileSlope(tile, NULL);
00757 
00758   DiagDirection dir = Extract<DiagDirection, 0>(p2);
00759 
00760   /* Prohibit construction if
00761    * The tile is non-flat AND
00762    * 1) build-on-slopes is disabled
00763    * 2) the tile is steep i.e. spans two height levels
00764    * 3) the exit points in the wrong direction
00765    */
00766 
00767   if (tileh != SLOPE_FLAT && (
00768         !_settings_game.construction.build_on_slopes ||
00769         IsSteepSlope(tileh) ||
00770         !CanBuildDepotByTileh(dir, tileh)
00771       )) {
00772     return_cmd_error(STR_0007_FLAT_LAND_REQUIRED);
00773   }
00774 
00775   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00776   if (CmdFailed(cost)) return CMD_ERROR;
00777 
00778   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
00779 
00780   if (!Depot::CanAllocateItem()) return CMD_ERROR;
00781 
00782   if (flags & DC_EXEC) {
00783     Depot *d = new Depot(tile);
00784     MakeRailDepot(tile, _current_company, dir, (RailType)p1);
00785     MarkTileDirtyByTile(tile);
00786 
00787     d->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
00788 
00789     AddSideToSignalBuffer(tile, INVALID_DIAGDIR, _current_company);
00790     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
00791   }
00792 
00793   return cost.AddCost(_price.build_train_depot);
00794 }
00795 
00814 CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00815 {
00816   Track track = (Track)GB(p1, 0, 3);
00817   bool ctrl_pressed = HasBit(p1, 3); // was the CTRL button pressed
00818   SignalVariant sigvar = (ctrl_pressed ^ HasBit(p1, 4)) ? SIG_SEMAPHORE : SIG_ELECTRIC; // the signal variant of the new signal
00819   SignalType sigtype = (SignalType)GB(p1, 5, 3); // the signal type of the new signal
00820   bool convert_signal = HasBit(p1, 8); // convert button pressed
00821   SignalType cycle_start = (SignalType)GB(p1, 9, 3);
00822   SignalType cycle_stop = (SignalType)GB(p1, 12, 3);
00823   CommandCost cost;
00824   uint num_dir_cycle = GB(p1, 15, 2);
00825 
00826   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
00827 
00828   if (!ValParamTrackOrientation(track) || !IsTileType(tile, MP_RAILWAY) || !EnsureNoTrainOnTrack(tile, track))
00829     return CMD_ERROR;
00830 
00831   /* Protect against invalid signal copying */
00832   if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
00833 
00834   /* You can only build signals on plain rail tiles, and the selected track must exist */
00835   if (!IsPlainRailTile(tile) || !HasTrack(tile, track)) return CMD_ERROR;
00836 
00837   if (!CheckTileOwnership(tile)) return CMD_ERROR;
00838 
00839   {
00840     /* See if this is a valid track combination for signals, (ie, no overlap) */
00841     TrackBits trackbits = GetTrackBits(tile);
00842     if (KillFirstBit(trackbits) != TRACK_BIT_NONE && // More than one track present
00843         trackbits != TRACK_BIT_HORZ &&
00844         trackbits != TRACK_BIT_VERT) {
00845       return_cmd_error(STR_1005_NO_SUITABLE_RAILROAD_TRACK);
00846     }
00847   }
00848 
00849   /* In case we don't want to change an existing signal, return without error. */
00850   if (HasBit(p1, 17) && HasSignalOnTrack(tile, track)) return CommandCost();
00851 
00852   /* you can not convert a signal if no signal is on track */
00853   if (convert_signal && !HasSignalOnTrack(tile, track)) return CMD_ERROR;
00854 
00855   if (!HasSignalOnTrack(tile, track)) {
00856     /* build new signals */
00857     cost = CommandCost(EXPENSES_CONSTRUCTION, _price.build_signals);
00858   } else {
00859     if (p2 != 0 && sigvar != GetSignalVariant(tile, track)) {
00860       /* convert signals <-> semaphores */
00861       cost = CommandCost(EXPENSES_CONSTRUCTION, _price.build_signals + _price.remove_signals);
00862 
00863     } else if (convert_signal) {
00864       /* convert button pressed */
00865       if (ctrl_pressed || GetSignalVariant(tile, track) != sigvar) {
00866         /* convert electric <-> semaphore */
00867         cost = CommandCost(EXPENSES_CONSTRUCTION, _price.build_signals + _price.remove_signals);
00868       } else {
00869         /* it is free to change signal type: normal-pre-exit-combo */
00870         cost = CommandCost();
00871       }
00872 
00873     } else {
00874       /* it is free to change orientation/pre-exit-combo signals */
00875       cost = CommandCost();
00876     }
00877   }
00878 
00879   if (flags & DC_EXEC) {
00880     Vehicle *v = NULL;
00881     /* The new/changed signal could block our path. As this can lead to
00882      * stale reservations, we clear the path reservation here and try
00883      * to redo it later on. */
00884     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
00885       v = GetTrainForReservation(tile, track);
00886       if (v != NULL) FreeTrainTrackReservation(v);
00887     }
00888 
00889     if (!HasSignals(tile)) {
00890       /* there are no signals at all on this tile yet */
00891       SetHasSignals(tile, true);
00892       SetSignalStates(tile, 0xF); // all signals are on
00893       SetPresentSignals(tile, 0); // no signals built by default
00894       SetSignalType(tile, track, sigtype);
00895       SetSignalVariant(tile, track, sigvar);
00896     }
00897 
00898     if (p2 == 0) {
00899       if (!HasSignalOnTrack(tile, track)) {
00900         /* build new signals */
00901         SetPresentSignals(tile, GetPresentSignals(tile) | (IsPbsSignal(sigtype) ? KillFirstBit(SignalOnTrack(track)) : SignalOnTrack(track)));
00902         SetSignalType(tile, track, sigtype);
00903         SetSignalVariant(tile, track, sigvar);
00904         while (num_dir_cycle-- > 0) CycleSignalSide(tile, track);
00905       } else {
00906         if (convert_signal) {
00907           /* convert signal button pressed */
00908           if (ctrl_pressed) {
00909             /* toggle the pressent signal variant: SIG_ELECTRIC <-> SIG_SEMAPHORE */
00910             SetSignalVariant(tile, track, (GetSignalVariant(tile, track) == SIG_ELECTRIC) ? SIG_SEMAPHORE : SIG_ELECTRIC);
00911             /* Query current signal type so the check for PBS signals below works. */
00912             sigtype = GetSignalType(tile, track);
00913           } else {
00914             /* convert the present signal to the chosen type and variant */
00915             SetSignalType(tile, track, sigtype);
00916             SetSignalVariant(tile, track, sigvar);
00917             if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
00918               SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
00919             }
00920           }
00921 
00922         } else if (ctrl_pressed) {
00923           /* cycle between cycle_start and cycle_end */
00924           sigtype = (SignalType)(GetSignalType(tile, track) + 1);
00925 
00926           if (sigtype < cycle_start || sigtype > cycle_stop) sigtype = cycle_start;
00927 
00928           SetSignalType(tile, track, sigtype);
00929           if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
00930             SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
00931           }
00932         } else {
00933           /* cycle the signal side: both -> left -> right -> both -> ... */
00934           CycleSignalSide(tile, track);
00935           /* Query current signal type so the check for PBS signals below works. */
00936           sigtype = GetSignalType(tile, track);
00937         }
00938       }
00939     } else {
00940       /* If CmdBuildManySignals is called with copying signals, just copy the
00941        * direction of the first signal given as parameter by CmdBuildManySignals */
00942       SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | (p2 & SignalOnTrack(track)));
00943       SetSignalVariant(tile, track, sigvar);
00944       SetSignalType(tile, track, sigtype);
00945     }
00946 
00947     if (IsPbsSignal(sigtype)) {
00948       /* PBS signals should show red unless they are on a reservation. */
00949       uint mask = GetPresentSignals(tile) & SignalOnTrack(track);
00950       SetSignalStates(tile, (GetSignalStates(tile) & ~mask) | ((HasBit(GetTrackReservation(tile), track) ? UINT_MAX : 0) & mask));
00951     }
00952     MarkTileDirtyByTile(tile);
00953     AddTrackToSignalBuffer(tile, track, _current_company);
00954     YapfNotifyTrackLayoutChange(tile, track);
00955     if (v != NULL) TryPathReserve(v, true);
00956   }
00957 
00958   return cost;
00959 }
00960 
00961 static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
00962 {
00963   tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
00964   if (tile == INVALID_TILE) return false;
00965 
00966   /* Check for track bits on the new tile */
00967   TrackdirBits trackdirbits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
00968 
00969   if (TracksOverlap(TrackdirBitsToTrackBits(trackdirbits))) return false;
00970   trackdirbits &= TrackdirReachesTrackdirs(trackdir);
00971 
00972   /* No track bits, must stop */
00973   if (trackdirbits == TRACKDIR_BIT_NONE) return false;
00974 
00975   /* Get the first track dir */
00976   trackdir = RemoveFirstTrackdir(&trackdirbits);
00977 
00978   /* Any left? It's a junction so we stop */
00979   if (trackdirbits != TRACKDIR_BIT_NONE) return false;
00980 
00981   switch (GetTileType(tile)) {
00982     case MP_RAILWAY:
00983       if (IsRailDepot(tile)) return false;
00984       if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
00985       signal_ctr++;
00986       if (IsDiagonalTrackdir(trackdir)) {
00987         signal_ctr++;
00988         /* Ensure signal_ctr even so X and Y pieces get signals */
00989         ClrBit(signal_ctr, 0);
00990       }
00991       return true;
00992 
00993     case MP_ROAD:
00994       if (!IsLevelCrossing(tile)) return false;
00995       signal_ctr += 2;
00996       return true;
00997 
00998     case MP_TUNNELBRIDGE: {
00999       TileIndex orig_tile = tile; // backup old value
01000 
01001       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
01002       if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
01003 
01004       /* Skip to end of tunnel or bridge
01005        * note that tile is a parameter by reference, so it must be updated */
01006       tile = GetOtherTunnelBridgeEnd(tile);
01007 
01008       signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
01009       return true;
01010     }
01011 
01012     default: return false;
01013   }
01014 }
01015 
01029 static CommandCost CmdSignalTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01030 {
01031   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
01032   int signal_ctr;
01033   byte signals;
01034   bool error = true;
01035   TileIndex end_tile;
01036   TileIndex start_tile = tile;
01037 
01038   Track track = (Track)GB(p2, 0, 3);
01039   bool mode = HasBit(p2, 3);
01040   bool semaphores = HasBit(p2, 4);
01041   bool remove = HasBit(p2, 5);
01042   bool autofill = HasBit(p2, 6);
01043   Trackdir trackdir = TrackToTrackdir(track);
01044   byte signal_density = GB(p2, 24, 8);
01045 
01046   if (p1 >= MapSize()) return CMD_ERROR;
01047   end_tile = p1;
01048   if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
01049 
01050   if (!IsTileType(tile, MP_RAILWAY) || !IsPlainRailTile(tile)) return CMD_ERROR;
01051 
01052   /* for vertical/horizontal tracks, double the given signals density
01053    * since the original amount will be too dense (shorter tracks) */
01054   signal_density *= 2;
01055 
01056   if (CmdFailed(ValidateAutoDrag(&trackdir, tile, end_tile))) return CMD_ERROR;
01057 
01058   track = TrackdirToTrack(trackdir); // trackdir might have changed, keep track in sync
01059   Trackdir start_trackdir = trackdir;
01060 
01061   /* Must start on a valid track to be able to avoid loops */
01062   if (!HasTrack(tile, track)) return CMD_ERROR;
01063 
01064   SignalType sigtype = (SignalType)GB(p2, 7, 3);
01065   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
01066 
01067   /* copy the signal-style of the first rail-piece if existing */
01068   if (HasSignalOnTrack(tile, track)) {
01069     signals = GetPresentSignals(tile) & SignalOnTrack(track);
01070     assert(signals != 0);
01071 
01072     /* copy signal/semaphores style (independent of CTRL) */
01073     semaphores = GetSignalVariant(tile, track) != SIG_ELECTRIC;
01074 
01075     sigtype = GetSignalType(tile, track);
01076     /* Don't but copy pre-signal type */
01077     if (sigtype < SIGTYPE_PBS) sigtype = SIGTYPE_NORMAL;
01078   } else { // no signals exist, drag a two-way signal stretch
01079     signals = IsPbsSignal(sigtype) ? SignalAlongTrackdir(trackdir) : SignalOnTrack(track);
01080   }
01081 
01082   byte signal_dir = 0;
01083   if (signals & SignalAlongTrackdir(trackdir))   SetBit(signal_dir, 0);
01084   if (signals & SignalAgainstTrackdir(trackdir)) SetBit(signal_dir, 1);
01085 
01086   /* signal_ctr         - amount of tiles already processed
01087    * signals_density    - setting to put signal on every Nth tile (double space on |, -- tracks)
01088    **********
01089    * trackdir   - trackdir to build with autorail
01090    * semaphores - semaphores or signals
01091    * signals    - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
01092    *              and convert all others to semaphore/signal
01093    * remove     - 1 remove signals, 0 build signals */
01094   signal_ctr = 0;
01095   for (;;) {
01096     /* only build/remove signals with the specified density */
01097     if ((remove && autofill) || signal_ctr % signal_density == 0) {
01098       uint32 p1 = GB(TrackdirToTrack(trackdir), 0, 3);
01099       SB(p1, 3, 1, mode);
01100       SB(p1, 4, 1, semaphores);
01101       SB(p1, 5, 3, sigtype);
01102       if (!remove && signal_ctr == 0) SetBit(p1, 17);
01103 
01104       /* Pick the correct orientation for the track direction */
01105       signals = 0;
01106       if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
01107       if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
01108 
01109       ret = DoCommand(tile, p1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
01110 
01111       /* Be user-friendly and try placing signals as much as possible */
01112       if (CmdSucceeded(ret)) {
01113         error = false;
01114         total_cost.AddCost(ret);
01115       }
01116     }
01117 
01118     if (autofill) {
01119       if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
01120 
01121       /* Prevent possible loops */
01122       if (tile == start_tile && trackdir == start_trackdir) break;
01123     } else {
01124       if (tile == end_tile) break;
01125 
01126       tile += ToTileIndexDiff(_trackdelta[trackdir]);
01127       signal_ctr++;
01128 
01129       /* toggle railbit for the non-diagonal tracks (|, -- tracks) */
01130       if (IsDiagonalTrackdir(trackdir)) {
01131         signal_ctr++;
01132       } else {
01133         ToggleBit(trackdir, 0);
01134       }
01135     }
01136   }
01137 
01138   return error ? CMD_ERROR : total_cost;
01139 }
01140 
01156 CommandCost CmdBuildSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01157 {
01158   return CmdSignalTrackHelper(tile, flags, p1, p2,text);
01159 }
01160 
01170 CommandCost CmdRemoveSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01171 {
01172   Track track = (Track)GB(p1, 0, 3);
01173 
01174   if (!ValParamTrackOrientation(track) ||
01175       !IsTileType(tile, MP_RAILWAY) ||
01176       !IsPlainRailTile(tile) ||
01177       !HasTrack(tile, track) ||
01178       !EnsureNoTrainOnTrack(tile, track) ||
01179       !HasSignalOnTrack(tile, track)) {
01180     return CMD_ERROR;
01181   }
01182 
01183   /* Only water can remove signals from anyone */
01184   if (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) return CMD_ERROR;
01185 
01186   /* Do it? */
01187   if (flags & DC_EXEC) {
01188     Vehicle *v = NULL;
01189     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
01190       v = GetTrainForReservation(tile, track);
01191     }
01192     SetPresentSignals(tile, GetPresentSignals(tile) & ~SignalOnTrack(track));
01193 
01194     /* removed last signal from tile? */
01195     if (GetPresentSignals(tile) == 0) {
01196       SetSignalStates(tile, 0);
01197       SetHasSignals(tile, false);
01198       SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
01199     }
01200 
01201     AddTrackToSignalBuffer(tile, track, GetTileOwner(tile));
01202     YapfNotifyTrackLayoutChange(tile, track);
01203     if (v != NULL) TryPathReserve(v, false);
01204 
01205     MarkTileDirtyByTile(tile);
01206   }
01207 
01208   return CommandCost(EXPENSES_CONSTRUCTION, _price.remove_signals);
01209 }
01210 
01226 CommandCost CmdRemoveSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01227 {
01228   return CmdSignalTrackHelper(tile, flags, p1, SetBit(p2, 5), text); // bit 5 is remove bit
01229 }
01230 
01232 Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
01233 {
01234   /* Similiar checks as in TrainPowerChanged() */
01235 
01236   if (v->type == VEH_TRAIN && !IsArticulatedPart(v)) {
01237     const RailVehicleInfo *rvi = RailVehInfo(v->engine_type);
01238     if (GetVehicleProperty(v, 0x0B, rvi->power) != 0) TrainPowerChanged(v->First());
01239   }
01240 
01241   return NULL;
01242 }
01243 
01251 CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01252 {
01253   CommandCost cost(EXPENSES_CONSTRUCTION);
01254   RailType totype = (RailType)p2;
01255 
01256   if (!ValParamRailtype(totype)) return CMD_ERROR;
01257   if (p1 >= MapSize()) return CMD_ERROR;
01258 
01259   uint ex = TileX(tile);
01260   uint ey = TileY(tile);
01261   uint sx = TileX(p1);
01262   uint sy = TileY(p1);
01263 
01264   /* make sure sx,sy are smaller than ex,ey */
01265   if (ex < sx) Swap(ex, sx);
01266   if (ey < sy) Swap(ey, sy);
01267 
01268   _error_message = STR_1005_NO_SUITABLE_RAILROAD_TRACK; // by default, there is no track to convert
01269 
01270   for (uint x = sx; x <= ex; ++x) {
01271     for (uint y = sy; y <= ey; ++y) {
01272       TileIndex tile = TileXY(x, y);
01273       TileType tt = GetTileType(tile);
01274 
01275       /* Check if there is any track on tile */
01276       switch (tt) {
01277         case MP_RAILWAY:
01278           break;
01279         case MP_STATION:
01280           if (!IsRailwayStation(tile)) continue;
01281           break;
01282         case MP_ROAD:
01283           if (!IsLevelCrossing(tile)) continue;
01284           break;
01285         case MP_TUNNELBRIDGE:
01286           if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
01287           break;
01288         default: continue;
01289       }
01290 
01291       /* Original railtype we are converting from */
01292       RailType type = GetRailType(tile);
01293 
01294       /* Converting to the same type or converting 'hidden' elrail -> rail */
01295       if (type == totype || (_settings_game.vehicle.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
01296 
01297       /* Trying to convert other's rail */
01298       if (!CheckTileOwnership(tile)) continue;
01299 
01300       SmallVector<Vehicle*, 2> vehicles_affected;
01301 
01302       /* Vehicle on the tile when not converting Rail <-> ElRail
01303        * Tunnels and bridges have special check later */
01304       if (tt != MP_TUNNELBRIDGE) {
01305         if (!IsCompatibleRail(type, totype) && !EnsureNoVehicleOnGround(tile)) continue;
01306         if (flags & DC_EXEC) { // we can safely convert, too
01307           TrackBits reserved = GetReservedTrackbits(tile);
01308           Track     track;
01309           while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
01310             Vehicle *v = GetTrainForReservation(tile, track);
01311             if (v != NULL && !HasPowerOnRail(v->u.rail.railtype, totype)) {
01312               /* No power on new rail type, reroute. */
01313               FreeTrainTrackReservation(v);
01314               *vehicles_affected.Append() = v;
01315             }
01316           }
01317 
01318           SetRailType(tile, totype);
01319           MarkTileDirtyByTile(tile);
01320           /* update power of train engines on this tile */
01321           FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
01322         }
01323       }
01324 
01325       switch (tt) {
01326         case MP_RAILWAY:
01327           switch (GetRailTileType(tile)) {
01328             case RAIL_TILE_WAYPOINT:
01329               if (flags & DC_EXEC) {
01330                 /* notify YAPF about the track layout change */
01331                 YapfNotifyTrackLayoutChange(tile, GetRailWaypointTrack(tile));
01332               }
01333               cost.AddCost(RailConvertCost(type, totype));
01334               break;
01335 
01336             case RAIL_TILE_DEPOT:
01337               if (flags & DC_EXEC) {
01338                 /* notify YAPF about the track layout change */
01339                 YapfNotifyTrackLayoutChange(tile, GetRailDepotTrack(tile));
01340 
01341                 /* Update build vehicle window related to this depot */
01342                 InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
01343                 InvalidateWindowData(WC_BUILD_VEHICLE, tile);
01344               }
01345               cost.AddCost(RailConvertCost(type, totype));
01346               break;
01347 
01348             default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
01349               if (flags & DC_EXEC) {
01350                 /* notify YAPF about the track layout change */
01351                 TrackBits tracks = GetTrackBits(tile);
01352                 while (tracks != TRACK_BIT_NONE) {
01353                   YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
01354                 }
01355               }
01356               cost.AddCost(RailConvertCost(type, totype) * CountBits(GetTrackBits(tile)));
01357               break;
01358           }
01359           break;
01360 
01361         case MP_TUNNELBRIDGE: {
01362           TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
01363 
01364           /* If both ends of tunnel/bridge are in the range, do not try to convert twice -
01365            * it would cause assert because of different test and exec runs */
01366           if (endtile < tile && TileX(endtile) >= sx && TileX(endtile) <= ex &&
01367               TileY(endtile) >= sy && TileY(endtile) <= ey) continue;
01368 
01369           /* When not coverting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
01370           if (!IsCompatibleRail(GetRailType(tile), totype) &&
01371               HasVehicleOnTunnelBridge(tile, endtile)) continue;
01372 
01373           if (flags & DC_EXEC) {
01374             Track track = DiagDirToDiagTrack(GetTunnelBridgeDirection(tile));
01375             if (GetTunnelBridgeReservation(tile)) {
01376               Vehicle *v = GetTrainForReservation(tile, track);
01377               if (v != NULL && !HasPowerOnRail(v->u.rail.railtype, totype)) {
01378                 /* No power on new rail type, reroute. */
01379                 FreeTrainTrackReservation(v);
01380                 *vehicles_affected.Append() = v;
01381               }
01382             }
01383             SetRailType(tile, totype);
01384             SetRailType(endtile, totype);
01385 
01386             FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
01387             FindVehicleOnPos(endtile, NULL, &UpdateTrainPowerProc);
01388 
01389             YapfNotifyTrackLayoutChange(tile, track);
01390             YapfNotifyTrackLayoutChange(endtile, track);
01391 
01392             MarkTileDirtyByTile(tile);
01393             MarkTileDirtyByTile(endtile);
01394 
01395             if (IsBridge(tile)) {
01396               TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
01397               TileIndex t = tile + delta;
01398               for (; t != endtile; t += delta) MarkTileDirtyByTile(t); // TODO encapsulate this into a function
01399             }
01400           }
01401 
01402           cost.AddCost((GetTunnelBridgeLength(tile, endtile) + 2) * RailConvertCost(type, totype));
01403         } break;
01404 
01405         default: // MP_STATION, MP_ROAD
01406           if (flags & DC_EXEC) {
01407             Track track = ((tt == MP_STATION) ? GetRailStationTrack(tile) : GetCrossingRailTrack(tile));
01408             YapfNotifyTrackLayoutChange(tile, track);
01409           }
01410 
01411           cost.AddCost(RailConvertCost(type, totype));
01412           break;
01413       }
01414 
01415       for (uint i = 0; i < vehicles_affected.Length(); ++i) {
01416         TryPathReserve(vehicles_affected[i], true);
01417       }
01418     }
01419   }
01420 
01421   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
01422 }
01423 
01424 static CommandCost RemoveTrainDepot(TileIndex tile, DoCommandFlag flags)
01425 {
01426   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER)
01427     return CMD_ERROR;
01428 
01429   if (!EnsureNoVehicleOnGround(tile))
01430     return CMD_ERROR;
01431 
01432   if (flags & DC_EXEC) {
01433     /* read variables before the depot is removed */
01434     DiagDirection dir = GetRailDepotDirection(tile);
01435     Owner owner = GetTileOwner(tile);
01436     Vehicle *v = NULL;
01437 
01438     if (GetDepotWaypointReservation(tile)) {
01439       v = GetTrainForReservation(tile, DiagDirToDiagTrack(dir));
01440       if (v != NULL) FreeTrainTrackReservation(v);
01441     }
01442 
01443     DoClearSquare(tile);
01444     delete GetDepotByTile(tile);
01445     AddSideToSignalBuffer(tile, dir, owner);
01446     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
01447     if (v != NULL) TryPathReserve(v, true);
01448   }
01449 
01450   return CommandCost(EXPENSES_CONSTRUCTION, _price.remove_train_depot);
01451 }
01452 
01453 static CommandCost ClearTile_Track(TileIndex tile, DoCommandFlag flags)
01454 {
01455   CommandCost cost(EXPENSES_CONSTRUCTION);
01456   CommandCost ret;
01457 
01458   if (flags & DC_AUTO) {
01459     if (!IsTileOwner(tile, _current_company))
01460       return_cmd_error(STR_1024_AREA_IS_OWNED_BY_ANOTHER);
01461 
01462     if (IsPlainRailTile(tile)) {
01463       return_cmd_error(STR_1008_MUST_REMOVE_RAILROAD_TRACK);
01464     } else {
01465       return_cmd_error(STR_2004_BUILDING_MUST_BE_DEMOLISHED);
01466     }
01467   }
01468 
01469   switch (GetRailTileType(tile)) {
01470     case RAIL_TILE_SIGNALS:
01471     case RAIL_TILE_NORMAL: {
01472       Slope tileh = GetTileSlope(tile, NULL);
01473       /* Is there flat water on the lower halftile, that gets cleared expensively? */
01474       bool water_ground = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh));
01475 
01476       TrackBits tracks = GetTrackBits(tile);
01477       while (tracks != TRACK_BIT_NONE) {
01478         Track track = RemoveFirstTrack(&tracks);
01479         ret = DoCommand(tile, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
01480         if (CmdFailed(ret)) return CMD_ERROR;
01481         cost.AddCost(ret);
01482       }
01483 
01484       /* when bankrupting, don't make water dirty, there could be a ship on lower halftile */
01485       if (water_ground && !(flags & DC_BANKRUPT)) {
01486         if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
01487 
01488         /* The track was removed, and left a coast tile. Now also clear the water. */
01489         if (flags & DC_EXEC) DoClearSquare(tile);
01490         cost.AddCost(_price.clear_water);
01491       }
01492 
01493       return cost;
01494     }
01495 
01496     case RAIL_TILE_DEPOT:
01497       return RemoveTrainDepot(tile, flags);
01498 
01499     case RAIL_TILE_WAYPOINT:
01500       return RemoveTrainWaypoint(tile, flags, false);
01501 
01502     default:
01503       return CMD_ERROR;
01504   }
01505 }
01506 
01511 static uint GetSaveSlopeZ(uint x, uint y, Track track)
01512 {
01513   switch (track) {
01514     case TRACK_UPPER: x &= ~0xF; y &= ~0xF; break;
01515     case TRACK_LOWER: x |=  0xF; y |=  0xF; break;
01516     case TRACK_LEFT:  x |=  0xF; y &= ~0xF; break;
01517     case TRACK_RIGHT: x &= ~0xF; y |=  0xF; break;
01518     default: break;
01519   }
01520   return GetSlopeZ(x, y);
01521 }
01522 
01523 static void DrawSingleSignal(TileIndex tile, Track track, byte condition, uint image, uint pos)
01524 {
01525   bool side = (_settings_game.vehicle.road_side != 0) && _settings_game.construction.signal_side;
01526   static const Point SignalPositions[2][12] = {
01527     { // Signals on the left side
01528     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
01529       { 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
01530     /*  LOWER     LOWER     X         X         Y         Y     */
01531       {11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
01532     }, { // Signals on the right side
01533     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
01534       {14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
01535     /*  LOWER     LOWER     X         X         Y         Y     */
01536       {14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
01537     }
01538   };
01539 
01540   uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
01541   uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
01542 
01543   SpriteID sprite;
01544 
01545   SignalType type       = GetSignalType(tile, track);
01546   SignalVariant variant = GetSignalVariant(tile, track);
01547 
01548   if (type == SIGTYPE_NORMAL && variant == SIG_ELECTRIC) {
01549     /* Normal electric signals are picked from original sprites. */
01550     sprite = SPR_ORIGINAL_SIGNALS_BASE + image + condition;
01551   } else {
01552     /* All other signals are picked from add on sprites. */
01553     sprite = SPR_SIGNALS_BASE + (type - 1) * 16 + variant * 64 + image + condition + (type > SIGTYPE_LAST_NOPBS ? 64 : 0);
01554   }
01555 
01556   AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, GetSaveSlopeZ(x, y, track));
01557 }
01558 
01559 static uint32 _drawtile_track_palette;
01560 
01561 
01562 static void DrawTrackFence_NW(const TileInfo *ti, SpriteID base_image)
01563 {
01564   RailFenceOffset rfo = RFO_FLAT_X;
01565   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
01566   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01567     ti->x, ti->y + 1, 16, 1, 4, ti->z);
01568 }
01569 
01570 static void DrawTrackFence_SE(const TileInfo *ti, SpriteID base_image)
01571 {
01572   RailFenceOffset rfo = RFO_FLAT_X;
01573   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
01574   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01575     ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
01576 }
01577 
01578 static void DrawTrackFence_NW_SE(const TileInfo *ti, SpriteID base_image)
01579 {
01580   DrawTrackFence_NW(ti, base_image);
01581   DrawTrackFence_SE(ti, base_image);
01582 }
01583 
01584 static void DrawTrackFence_NE(const TileInfo *ti, SpriteID base_image)
01585 {
01586   RailFenceOffset rfo = RFO_FLAT_Y;
01587   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
01588   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01589     ti->x + 1, ti->y, 1, 16, 4, ti->z);
01590 }
01591 
01592 static void DrawTrackFence_SW(const TileInfo *ti, SpriteID base_image)
01593 {
01594   RailFenceOffset rfo = RFO_FLAT_Y;
01595   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
01596   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01597     ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
01598 }
01599 
01600 static void DrawTrackFence_NE_SW(const TileInfo *ti, SpriteID base_image)
01601 {
01602   DrawTrackFence_NE(ti, base_image);
01603   DrawTrackFence_SW(ti, base_image);
01604 }
01605 
01609 static void DrawTrackFence_NS_1(const TileInfo *ti, SpriteID base_image)
01610 {
01611   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_W);
01612   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
01613     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01614 }
01615 
01619 static void DrawTrackFence_NS_2(const TileInfo *ti, SpriteID base_image)
01620 {
01621   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_E);
01622   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
01623     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01624 }
01625 
01629 static void DrawTrackFence_WE_1(const TileInfo *ti, SpriteID base_image)
01630 {
01631   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_N);
01632   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
01633     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01634 }
01635 
01639 static void DrawTrackFence_WE_2(const TileInfo *ti, SpriteID base_image)
01640 {
01641   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_S);
01642   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
01643     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01644 }
01645 
01646 
01647 static void DrawTrackDetails(const TileInfo *ti)
01648 {
01649   /* Base sprite for track fences. */
01650   SpriteID base_image = SPR_TRACK_FENCE_FLAT_X;
01651 
01652   switch (GetRailGroundType(ti->tile)) {
01653     case RAIL_GROUND_FENCE_NW:     DrawTrackFence_NW(ti, base_image);    break;
01654     case RAIL_GROUND_FENCE_SE:     DrawTrackFence_SE(ti, base_image);    break;
01655     case RAIL_GROUND_FENCE_SENW:   DrawTrackFence_NW_SE(ti, base_image); break;
01656     case RAIL_GROUND_FENCE_NE:     DrawTrackFence_NE(ti, base_image);    break;
01657     case RAIL_GROUND_FENCE_SW:     DrawTrackFence_SW(ti, base_image);    break;
01658     case RAIL_GROUND_FENCE_NESW:   DrawTrackFence_NE_SW(ti, base_image); break;
01659     case RAIL_GROUND_FENCE_VERT1:  DrawTrackFence_NS_1(ti, base_image);  break;
01660     case RAIL_GROUND_FENCE_VERT2:  DrawTrackFence_NS_2(ti, base_image);  break;
01661     case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti, base_image);  break;
01662     case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti, base_image);  break;
01663     case RAIL_GROUND_WATER: {
01664       Corner track_corner;
01665       if (IsHalftileSlope(ti->tileh)) {
01666         /* Steep slope or one-corner-raised slope with halftile foundation */
01667         track_corner = GetHalftileSlopeCorner(ti->tileh);
01668       } else {
01669         /* Three-corner-raised slope */
01670         track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
01671       }
01672       switch (track_corner) {
01673         case CORNER_W: DrawTrackFence_NS_1(ti, base_image); break;
01674         case CORNER_S: DrawTrackFence_WE_2(ti, base_image); break;
01675         case CORNER_E: DrawTrackFence_NS_2(ti, base_image); break;
01676         case CORNER_N: DrawTrackFence_WE_1(ti, base_image); break;
01677         default: NOT_REACHED();
01678       }
01679       break;
01680     }
01681     default: break;
01682   }
01683 }
01684 
01685 
01691 static void DrawTrackBits(TileInfo *ti, TrackBits track)
01692 {
01693   /* SubSprite for drawing the track halftile of 'three-corners-raised'-sloped rail sprites. */
01694   static const int INF = 1000; // big number compared to tilesprite size
01695   static const SubSprite _halftile_sub_sprite[4] = {
01696     { -INF    , -INF  , 32 - 33, INF     }, // CORNER_W, clip 33 pixels from right
01697     { -INF    ,  0 + 7, INF    , INF     }, // CORNER_S, clip 7 pixels from top
01698     { -31 + 33, -INF  , INF    , INF     }, // CORNER_E, clip 33 pixels from left
01699     { -INF    , -INF  , INF    , 30 - 23 }  // CORNER_N, clip 23 pixels from bottom
01700   };
01701 
01702   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
01703   RailGroundType rgt = GetRailGroundType(ti->tile);
01704   Foundation f = GetRailFoundation(ti->tileh, track);
01705   Corner halftile_corner = CORNER_INVALID;
01706 
01707   if (IsNonContinuousFoundation(f)) {
01708     /* Save halftile corner */
01709     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
01710     /* Draw lower part first */
01711     track &= ~CornerToTrackBits(halftile_corner);
01712     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
01713   }
01714 
01715   DrawFoundation(ti, f);
01716   /* DrawFoundation modifies ti */
01717 
01718   SpriteID image;
01719   SpriteID pal = PAL_NONE;
01720   const SubSprite *sub = NULL;
01721   bool junction = false;
01722 
01723   /* Select the sprite to use. */
01724   if (track == 0) {
01725     /* Clear ground (only track on halftile foundation) */
01726     if (rgt == RAIL_GROUND_WATER) {
01727       if (IsSteepSlope(ti->tileh)) {
01728         DrawShoreTile(ti->tileh);
01729         image = 0;
01730       } else {
01731         image = SPR_FLAT_WATER_TILE;
01732       }
01733     } else {
01734       switch (rgt) {
01735         case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
01736         case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOWY_TILE; break;
01737         default:                     image = SPR_FLAT_GRASS_TILE; break;
01738       }
01739       image += _tileh_to_sprite[ti->tileh];
01740     }
01741   } else {
01742     if (ti->tileh != SLOPE_FLAT) {
01743       /* track on non-flat ground */
01744       image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
01745     } else {
01746       /* track on flat ground */
01747       (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
01748       (image++,                           track == TRACK_BIT_X) ||
01749       (image++,                           track == TRACK_BIT_UPPER) ||
01750       (image++,                           track == TRACK_BIT_LOWER) ||
01751       (image++,                           track == TRACK_BIT_RIGHT) ||
01752       (image++,                           track == TRACK_BIT_LEFT) ||
01753       (image++,                           track == TRACK_BIT_CROSS) ||
01754 
01755       (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
01756       (image++,                            track == TRACK_BIT_VERT) ||
01757 
01758       (junction = true, false) ||
01759       (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
01760       (image++,                          (track & TRACK_BIT_3WAY_SW) == 0) ||
01761       (image++,                          (track & TRACK_BIT_3WAY_NW) == 0) ||
01762       (image++,                          (track & TRACK_BIT_3WAY_SE) == 0) ||
01763       (image++, true);
01764     }
01765 
01766     switch (rgt) {
01767       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
01768       case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset;  break;
01769       case RAIL_GROUND_WATER: {
01770         /* three-corner-raised slope */
01771         DrawShoreTile(ti->tileh);
01772         Corner track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
01773         sub = &(_halftile_sub_sprite[track_corner]);
01774         break;
01775       }
01776       default: break;
01777     }
01778   }
01779 
01780   if (image != 0) DrawGroundSprite(image, pal, sub);
01781 
01782   /* Draw track pieces individually for junction tiles */
01783   if (junction) {
01784     if (track & TRACK_BIT_X)     DrawGroundSprite(rti->base_sprites.single_y, PAL_NONE);
01785     if (track & TRACK_BIT_Y)     DrawGroundSprite(rti->base_sprites.single_x, PAL_NONE);
01786     if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PAL_NONE);
01787     if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PAL_NONE);
01788     if (track & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PAL_NONE);
01789     if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PAL_NONE);
01790   }
01791 
01792   /* PBS debugging, draw reserved tracks darker */
01793   if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation) {
01794     /* Get reservation, but mask track on halftile slope */
01795     TrackBits pbs = GetTrackReservation(ti->tile) & track;
01796     if (pbs & TRACK_BIT_X) {
01797       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
01798         DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH);
01799       } else {
01800         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
01801       }
01802     }
01803     if (pbs & TRACK_BIT_Y) {
01804       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
01805         DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH);
01806       } else {
01807         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
01808       }
01809     }
01810     if (pbs & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_N ? -TILE_HEIGHT : 0);
01811     if (pbs & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_S ? -TILE_HEIGHT : 0);
01812     if (pbs & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_W ? -TILE_HEIGHT : 0);
01813     if (pbs & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_E ? -TILE_HEIGHT : 0);
01814   }
01815 
01816   if (IsValidCorner(halftile_corner)) {
01817     DrawFoundation(ti, HalftileFoundation(halftile_corner));
01818 
01819     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
01820     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
01821     image = _track_sloped_sprites[fake_slope - 1] + rti->base_sprites.track_y;
01822     pal = PAL_NONE;
01823     switch (rgt) {
01824       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
01825       case RAIL_GROUND_ICE_DESERT:
01826       case RAIL_GROUND_HALF_SNOW:  image += rti->snow_offset;  break; // higher part has snow in this case too
01827       default: break;
01828     }
01829     DrawGroundSprite(image, pal, &(_halftile_sub_sprite[halftile_corner]));
01830 
01831     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, CornerToTrackBits(halftile_corner))) {
01832       static const byte _corner_to_track_sprite[] = {3, 1, 2, 0};
01833       DrawGroundSprite(_corner_to_track_sprite[halftile_corner] + rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, -TILE_HEIGHT);
01834     }
01835   }
01836 }
01837 
01843 enum {
01844   SIGNAL_TO_SOUTHWEST =  0,
01845   SIGNAL_TO_NORTHEAST =  2,
01846   SIGNAL_TO_SOUTHEAST =  4,
01847   SIGNAL_TO_NORTHWEST =  6,
01848   SIGNAL_TO_EAST      =  8,
01849   SIGNAL_TO_WEST      = 10,
01850   SIGNAL_TO_SOUTH     = 12,
01851   SIGNAL_TO_NORTH     = 14,
01852 };
01853 
01854 static void DrawSignals(TileIndex tile, TrackBits rails)
01855 {
01856 #define MAYBE_DRAW_SIGNAL(x,y,z,t) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, t, GetSingleSignalState(tile, x), y, z)
01857 
01858   if (!(rails & TRACK_BIT_Y)) {
01859     if (!(rails & TRACK_BIT_X)) {
01860       if (rails & TRACK_BIT_LEFT) {
01861         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTH, 0, TRACK_LEFT);
01862         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTH, 1, TRACK_LEFT);
01863       }
01864       if (rails & TRACK_BIT_RIGHT) {
01865         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_NORTH, 2, TRACK_RIGHT);
01866         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_SOUTH, 3, TRACK_RIGHT);
01867       }
01868       if (rails & TRACK_BIT_UPPER) {
01869         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_WEST, 4, TRACK_UPPER);
01870         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_EAST, 5, TRACK_UPPER);
01871       }
01872       if (rails & TRACK_BIT_LOWER) {
01873         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_WEST, 6, TRACK_LOWER);
01874         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_EAST, 7, TRACK_LOWER);
01875       }
01876     } else {
01877       MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHWEST, 8, TRACK_X);
01878       MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHEAST, 9, TRACK_X);
01879     }
01880   } else {
01881     MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHEAST, 10, TRACK_Y);
01882     MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHWEST, 11, TRACK_Y);
01883   }
01884 }
01885 
01886 static void DrawTile_Track(TileInfo *ti)
01887 {
01888   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
01889   SpriteID image;
01890 
01891   _drawtile_track_palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
01892 
01893   if (IsPlainRailTile(ti->tile)) {
01894     TrackBits rails = GetTrackBits(ti->tile);
01895 
01896     DrawTrackBits(ti, rails);
01897 
01898     if (HasBit(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti);
01899 
01900     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01901 
01902     if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
01903   } else {
01904     /* draw depot/waypoint */
01905     const DrawTileSprites *dts;
01906     const DrawTileSeqStruct *dtss;
01907     uint32 relocation;
01908     SpriteID pal = PAL_NONE;
01909 
01910     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01911 
01912     if (IsRailDepot(ti->tile)) {
01913       if (IsInvisibilitySet(TO_BUILDINGS)) {
01914         /* Draw rail instead of depot */
01915         dts = &_depot_invisible_gfx_table[GetRailDepotDirection(ti->tile)];
01916       } else {
01917         dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
01918       }
01919 
01920       relocation = rti->total_offset;
01921 
01922       image = dts->ground.sprite;
01923       if (image != SPR_FLAT_GRASS_TILE) image += rti->total_offset;
01924 
01925       /* adjust ground tile for desert
01926        * don't adjust for snow, because snow in depots looks weird */
01927       if (IsSnowRailGround(ti->tile) && _settings_game.game_creation.landscape == LT_TROPIC) {
01928         if (image != SPR_FLAT_GRASS_TILE) {
01929           image += rti->snow_offset; // tile with tracks
01930         } else {
01931           image = SPR_FLAT_SNOWY_TILE; // flat ground
01932         }
01933       }
01934     } else {
01935       /* look for customization */
01936       byte stat_id = GetWaypointByTile(ti->tile)->stat_id;
01937       const StationSpec *statspec = GetCustomStationSpec(STAT_CLASS_WAYP, stat_id);
01938 
01939       if (statspec != NULL) {
01940         /* emulate station tile - open with building */
01941         const Station *st = ComposeWaypointStation(ti->tile);
01942         uint gfx = 2;
01943 
01944         if (HasBit(statspec->callbackmask, CBM_STATION_SPRITE_LAYOUT)) {
01945           uint16 callback = GetStationCallback(CBID_STATION_SPRITE_LAYOUT, 0, 0, statspec, st, ti->tile);
01946           if (callback != CALLBACK_FAILED) gfx = callback;
01947         }
01948 
01949         if (statspec->renderdata == NULL) {
01950           dts = GetStationTileLayout(STATION_RAIL, gfx);
01951         } else {
01952           dts = &statspec->renderdata[(gfx < statspec->tiles ? gfx : 0) + GetWaypointAxis(ti->tile)];
01953         }
01954 
01955         if (dts != NULL && dts->seq != NULL) {
01956           relocation = GetCustomStationRelocation(statspec, st, ti->tile);
01957 
01958           image = dts->ground.sprite;
01959           if (HasBit(image, SPRITE_MODIFIER_USE_OFFSET)) {
01960             image += GetCustomStationGroundRelocation(statspec, st, ti->tile);
01961             image += rti->custom_ground_offset;
01962           } else {
01963             image += rti->total_offset;
01964           }
01965 
01966           pal = dts->ground.pal;
01967         } else {
01968           goto default_waypoint;
01969         }
01970       } else {
01971 default_waypoint:
01972         /* There is no custom layout, fall back to the default graphics */
01973         dts = &_waypoint_gfx_table[GetWaypointAxis(ti->tile)];
01974         relocation = 0;
01975         image = dts->ground.sprite + rti->total_offset;
01976         if (IsSnowRailGround(ti->tile)) image += rti->snow_offset;
01977       }
01978     }
01979 
01980     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, _drawtile_track_palette));
01981 
01982     /* PBS debugging, draw reserved tracks darker */
01983     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && GetDepotWaypointReservation(ti->tile) &&
01984         (!IsRailDepot(ti->tile) || GetRailDepotDirection(ti->tile) == DIAGDIR_SW || GetRailDepotDirection(ti->tile) == DIAGDIR_SE)) {
01985       DrawGroundSprite(GetWaypointAxis(ti->tile) == AXIS_X ? rti->base_sprites.single_y : rti->base_sprites.single_x, PALETTE_CRASH);
01986     }
01987 
01988     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01989 
01990     foreach_draw_tile_seq(dtss, dts->seq) {
01991       SpriteID image = dtss->image.sprite;
01992       SpriteID pal   = dtss->image.pal;
01993 
01994       /* Stop drawing sprite sequence once we meet a sprite that doesn't have to be opaque */
01995       if (IsInvisibilitySet(TO_BUILDINGS) && !HasBit(image, SPRITE_MODIFIER_OPAQUE)) return;
01996 
01997       /* Unlike stations, our default waypoint has no variation for
01998        * different railtype, so don't use the railtype offset if
01999        * no relocation is set */
02000       if (HasBit(image, SPRITE_MODIFIER_USE_OFFSET)) {
02001         image += rti->total_offset;
02002       } else {
02003         image += relocation;
02004       }
02005 
02006       pal = SpriteLayoutPaletteTransform(image, pal, _drawtile_track_palette);
02007 
02008       if ((byte)dtss->delta_z != 0x80) {
02009         AddSortableSpriteToDraw(
02010           image, pal,
02011           ti->x + dtss->delta_x, ti->y + dtss->delta_y,
02012           dtss->size_x, dtss->size_y,
02013           dtss->size_z, ti->z + dtss->delta_z,
02014           !HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(TO_BUILDINGS)
02015         );
02016       } else {
02017         /* For stations and original spritelayouts delta_x and delta_y are signed */
02018         AddChildSpriteScreen(image, pal, dtss->delta_x, dtss->delta_y, !HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(TO_BUILDINGS));
02019       }
02020     }
02021   }
02022   DrawBridgeMiddle(ti);
02023 }
02024 
02025 
02026 static void DrawTileSequence(int x, int y, SpriteID ground, const DrawTileSeqStruct *dtss, uint32 offset)
02027 {
02028   SpriteID palette = COMPANY_SPRITE_COLOUR(_local_company);
02029 
02030   DrawSprite(ground, PAL_NONE, x, y);
02031   for (; dtss->image.sprite != 0; dtss++) {
02032     Point pt = RemapCoords(dtss->delta_x, dtss->delta_y, dtss->delta_z);
02033     SpriteID image = dtss->image.sprite + offset;
02034 
02035     DrawSprite(image, HasBit(image, PALETTE_MODIFIER_COLOUR) ? palette : PAL_NONE, x + pt.x, y + pt.y);
02036   }
02037 }
02038 
02039 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
02040 {
02041   const DrawTileSprites *dts = &_depot_gfx_table[dir];
02042   SpriteID image = dts->ground.sprite;
02043   uint32 offset = GetRailTypeInfo(railtype)->total_offset;
02044 
02045   if (image != SPR_FLAT_GRASS_TILE) image += offset;
02046   DrawTileSequence(x + 33, y + 17, image, dts->seq, offset);
02047 }
02048 
02049 void DrawDefaultWaypointSprite(int x, int y, RailType railtype)
02050 {
02051   uint32 offset = GetRailTypeInfo(railtype)->total_offset;
02052   const DrawTileSprites *dts = &_waypoint_gfx_table[AXIS_X];
02053 
02054   DrawTileSequence(x, y, dts->ground.sprite + offset, dts->seq, 0);
02055 }
02056 
02057 static uint GetSlopeZ_Track(TileIndex tile, uint x, uint y)
02058 {
02059   uint z;
02060   Slope tileh = GetTileSlope(tile, &z);
02061 
02062   if (tileh == SLOPE_FLAT) return z;
02063   if (IsPlainRailTile(tile)) {
02064     z += ApplyFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
02065     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
02066   } else {
02067     return z + TILE_HEIGHT;
02068   }
02069 }
02070 
02071 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
02072 {
02073   return IsPlainRailTile(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
02074 }
02075 
02076 static void GetAcceptedCargo_Track(TileIndex tile, AcceptedCargo ac)
02077 {
02078   /* not used */
02079 }
02080 
02081 static void TileLoop_Track(TileIndex tile)
02082 {
02083   RailGroundType old_ground = GetRailGroundType(tile);
02084   RailGroundType new_ground;
02085 
02086   if (old_ground == RAIL_GROUND_WATER) {
02087     TileLoop_Water(tile);
02088     return;
02089   }
02090 
02091   switch (_settings_game.game_creation.landscape) {
02092     case LT_ARCTIC: {
02093       uint z;
02094       Slope slope = GetTileSlope(tile, &z);
02095       bool half = false;
02096 
02097       /* for non-flat track, use lower part of track
02098        * in other cases, use the highest part with track */
02099       if (IsPlainRailTile(tile)) {
02100         TrackBits track = GetTrackBits(tile);
02101         Foundation f = GetRailFoundation(slope, track);
02102 
02103         switch (f) {
02104           case FOUNDATION_NONE:
02105             /* no foundation - is the track on the upper side of three corners raised tile? */
02106             if (IsSlopeWithThreeCornersRaised(slope)) z += TILE_HEIGHT;
02107             break;
02108 
02109           case FOUNDATION_INCLINED_X:
02110           case FOUNDATION_INCLINED_Y:
02111             /* sloped track - is it on a steep slope? */
02112             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
02113             break;
02114 
02115           case FOUNDATION_STEEP_LOWER:
02116             /* only lower part of steep slope */
02117             z += TILE_HEIGHT;
02118             break;
02119 
02120           default:
02121             /* if it is a steep slope, then there is a track on higher part */
02122             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
02123             z += TILE_HEIGHT;
02124             break;
02125         }
02126 
02127         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
02128       } else {
02129         /* is the depot on a non-flat tile? */
02130         if (slope != SLOPE_FLAT) z += TILE_HEIGHT;
02131       }
02132 
02133       /* 'z' is now the lowest part of the highest track bit -
02134        * for sloped track, it is 'z' of lower part
02135        * for two track bits, it is 'z' of higher track bit
02136        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
02137       if (z > GetSnowLine()) {
02138         if (half && z - GetSnowLine() == TILE_HEIGHT) {
02139           /* track on non-continuous foundation, lower part is not under snow */
02140           new_ground = RAIL_GROUND_HALF_SNOW;
02141         } else {
02142           new_ground = RAIL_GROUND_ICE_DESERT;
02143         }
02144         goto set_ground;
02145       }
02146       break;
02147       }
02148 
02149     case LT_TROPIC:
02150       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
02151         new_ground = RAIL_GROUND_ICE_DESERT;
02152         goto set_ground;
02153       }
02154       break;
02155   }
02156 
02157   if (!IsPlainRailTile(tile)) return;
02158 
02159   new_ground = RAIL_GROUND_GRASS;
02160 
02161   if (old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
02162     /* determine direction of fence */
02163     TrackBits rail = GetTrackBits(tile);
02164 
02165     switch (rail) {
02166       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
02167       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
02168       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
02169       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
02170 
02171       default: {
02172         Owner owner = GetTileOwner(tile);
02173 
02174         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
02175               (rail & TRACK_BIT_3WAY_NW) == 0 &&
02176               (rail & TRACK_BIT_X)
02177             )) {
02178           TileIndex n = tile + TileDiffXY(0, -1);
02179           TrackBits nrail = (IsTileType(n, MP_RAILWAY) && IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02180 
02181           if (!IsTileType(n, MP_RAILWAY) ||
02182               !IsTileOwner(n, owner) ||
02183               nrail == TRACK_BIT_UPPER ||
02184               nrail == TRACK_BIT_LEFT) {
02185             new_ground = RAIL_GROUND_FENCE_NW;
02186           }
02187         }
02188 
02189         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
02190               (rail & TRACK_BIT_3WAY_SE) == 0 &&
02191               (rail & TRACK_BIT_X)
02192             )) {
02193           TileIndex n = tile + TileDiffXY(0, 1);
02194           TrackBits nrail = (IsTileType(n, MP_RAILWAY) && IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02195 
02196           if (!IsTileType(n, MP_RAILWAY) ||
02197               !IsTileOwner(n, owner) ||
02198               nrail == TRACK_BIT_LOWER ||
02199               nrail == TRACK_BIT_RIGHT) {
02200             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
02201               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
02202           }
02203         }
02204 
02205         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
02206               (rail & TRACK_BIT_3WAY_NE) == 0 &&
02207               (rail & TRACK_BIT_Y)
02208             )) {
02209           TileIndex n = tile + TileDiffXY(-1, 0);
02210           TrackBits nrail = (IsTileType(n, MP_RAILWAY) && IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02211 
02212           if (!IsTileType(n, MP_RAILWAY) ||
02213               !IsTileOwner(n, owner) ||
02214               nrail == TRACK_BIT_UPPER ||
02215               nrail == TRACK_BIT_RIGHT) {
02216             new_ground = RAIL_GROUND_FENCE_NE;
02217           }
02218         }
02219 
02220         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
02221               (rail & TRACK_BIT_3WAY_SW) == 0 &&
02222               (rail & TRACK_BIT_Y)
02223             )) {
02224           TileIndex n = tile + TileDiffXY(1, 0);
02225           TrackBits nrail = (IsTileType(n, MP_RAILWAY) && IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02226 
02227           if (!IsTileType(n, MP_RAILWAY) ||
02228               !IsTileOwner(n, owner) ||
02229               nrail == TRACK_BIT_LOWER ||
02230               nrail == TRACK_BIT_LEFT) {
02231             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
02232               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
02233           }
02234         }
02235         break;
02236       }
02237     }
02238   }
02239 
02240 set_ground:
02241   if (old_ground != new_ground) {
02242     SetRailGroundType(tile, new_ground);
02243     MarkTileDirtyByTile(tile);
02244   }
02245 }
02246 
02247 
02248 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
02249 {
02250   /* Case of half tile slope with water. */
02251   if (mode == TRANSPORT_WATER && IsPlainRailTile(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
02252     TrackBits tb = GetTrackBits(tile);
02253     switch (tb) {
02254       default: NOT_REACHED();
02255       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
02256       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
02257       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
02258       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
02259     }
02260     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
02261   }
02262 
02263   if (mode != TRANSPORT_RAIL) return 0;
02264 
02265   TrackBits trackbits = TRACK_BIT_NONE;
02266   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
02267 
02268   switch (GetRailTileType(tile)) {
02269     default: NOT_REACHED();
02270     case RAIL_TILE_NORMAL:
02271       trackbits = GetTrackBits(tile);
02272       break;
02273 
02274     case RAIL_TILE_SIGNALS: {
02275       trackbits = GetTrackBits(tile);
02276       byte a = GetPresentSignals(tile);
02277       uint b = GetSignalStates(tile);
02278 
02279       b &= a;
02280 
02281       /* When signals are not present (in neither direction),
02282        * we pretend them to be green. Otherwise, it depends on
02283        * the signal type. For signals that are only active from
02284        * one side, we set the missing signals explicitely to
02285        * `green'. Otherwise, they implicitely become `red'. */
02286       if (!IsOnewaySignal(tile, TRACK_UPPER) || (a & SignalOnTrack(TRACK_UPPER)) == 0) b |= ~a & SignalOnTrack(TRACK_UPPER);
02287       if (!IsOnewaySignal(tile, TRACK_LOWER) || (a & SignalOnTrack(TRACK_LOWER)) == 0) b |= ~a & SignalOnTrack(TRACK_LOWER);
02288 
02289       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
02290       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
02291       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
02292       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
02293 
02294       break;
02295     }
02296 
02297     case RAIL_TILE_DEPOT: {
02298       DiagDirection dir = GetRailDepotDirection(tile);
02299 
02300       if (side != INVALID_DIAGDIR && side != dir) break;
02301 
02302       trackbits = DiagDirToDiagTrackBits(dir);
02303       break;
02304     }
02305 
02306     case RAIL_TILE_WAYPOINT:
02307       trackbits = GetRailWaypointBits(tile);
02308       break;
02309   }
02310 
02311   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
02312 }
02313 
02314 static bool ClickTile_Track(TileIndex tile)
02315 {
02316   switch (GetRailTileType(tile)) {
02317     case RAIL_TILE_DEPOT:    ShowDepotWindow(tile, VEH_TRAIN);            return true;
02318     case RAIL_TILE_WAYPOINT: ShowWaypointWindow(GetWaypointByTile(tile)); return true;
02319     default: return false;
02320   }
02321 }
02322 
02323 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
02324 {
02325   td->owner[0] = GetTileOwner(tile);
02326   switch (GetRailTileType(tile)) {
02327     case RAIL_TILE_NORMAL:
02328       td->str = STR_1021_RAILROAD_TRACK;
02329       break;
02330 
02331     case RAIL_TILE_SIGNALS: {
02332       const StringID signal_type[6][6] = {
02333         {
02334           STR_RAILROAD_TRACK_WITH_NORMAL_SIGNALS,
02335           STR_RAILROAD_TRACK_WITH_NORMAL_PRESIGNALS,
02336           STR_RAILROAD_TRACK_WITH_NORMAL_EXITSIGNALS,
02337           STR_RAILROAD_TRACK_WITH_NORMAL_COMBOSIGNALS,
02338           STR_RAILROAD_TRACK_WITH_NORMAL_PBSSIGNALS,
02339           STR_RAILROAD_TRACK_WITH_NORMAL_NOENTRYSIGNALS
02340         },
02341         {
02342           STR_RAILROAD_TRACK_WITH_NORMAL_PRESIGNALS,
02343           STR_RAILROAD_TRACK_WITH_PRESIGNALS,
02344           STR_RAILROAD_TRACK_WITH_PRE_EXITSIGNALS,
02345           STR_RAILROAD_TRACK_WITH_PRE_COMBOSIGNALS,
02346           STR_RAILROAD_TRACK_WITH_PRE_PBSSIGNALS,
02347           STR_RAILROAD_TRACK_WITH_PRE_NOENTRYSIGNALS
02348         },
02349         {
02350           STR_RAILROAD_TRACK_WITH_NORMAL_EXITSIGNALS,
02351           STR_RAILROAD_TRACK_WITH_PRE_EXITSIGNALS,
02352           STR_RAILROAD_TRACK_WITH_EXITSIGNALS,
02353           STR_RAILROAD_TRACK_WITH_EXIT_COMBOSIGNALS,
02354           STR_RAILROAD_TRACK_WITH_EXIT_PBSSIGNALS,
02355           STR_RAILROAD_TRACK_WITH_EXIT_NOENTRYSIGNALS
02356         },
02357         {
02358           STR_RAILROAD_TRACK_WITH_NORMAL_COMBOSIGNALS,
02359           STR_RAILROAD_TRACK_WITH_PRE_COMBOSIGNALS,
02360           STR_RAILROAD_TRACK_WITH_EXIT_COMBOSIGNALS,
02361           STR_RAILROAD_TRACK_WITH_COMBOSIGNALS,
02362           STR_RAILROAD_TRACK_WITH_COMBO_PBSSIGNALS,
02363           STR_RAILROAD_TRACK_WITH_COMBO_NOENTRYSIGNALS
02364         },
02365         {
02366           STR_RAILROAD_TRACK_WITH_NORMAL_PBSSIGNALS,
02367           STR_RAILROAD_TRACK_WITH_PRE_PBSSIGNALS,
02368           STR_RAILROAD_TRACK_WITH_EXIT_PBSSIGNALS,
02369           STR_RAILROAD_TRACK_WITH_COMBO_PBSSIGNALS,
02370           STR_RAILROAD_TRACK_WITH_PBSSIGNALS,
02371           STR_RAILROAD_TRACK_WITH_PBS_NOENTRYSIGNALS
02372         },
02373         {
02374           STR_RAILROAD_TRACK_WITH_NORMAL_NOENTRYSIGNALS,
02375           STR_RAILROAD_TRACK_WITH_PRE_NOENTRYSIGNALS,
02376           STR_RAILROAD_TRACK_WITH_EXIT_NOENTRYSIGNALS,
02377           STR_RAILROAD_TRACK_WITH_COMBO_NOENTRYSIGNALS,
02378           STR_RAILROAD_TRACK_WITH_PBS_NOENTRYSIGNALS,
02379           STR_RAILROAD_TRACK_WITH_NOENTRYSIGNALS
02380         }
02381       };
02382 
02383       SignalType primary_signal;
02384       SignalType secondary_signal;
02385       if (HasSignalOnTrack(tile, TRACK_UPPER)) {
02386         primary_signal = GetSignalType(tile, TRACK_UPPER);
02387         secondary_signal = HasSignalOnTrack(tile, TRACK_LOWER) ? GetSignalType(tile, TRACK_LOWER) : primary_signal;
02388       } else {
02389         secondary_signal = primary_signal = GetSignalType(tile, TRACK_LOWER);
02390       }
02391 
02392       td->str = signal_type[secondary_signal][primary_signal];
02393       break;
02394     }
02395 
02396     case RAIL_TILE_DEPOT:
02397       td->str = STR_1023_RAILROAD_TRAIN_DEPOT;
02398       break;
02399 
02400     case RAIL_TILE_WAYPOINT:
02401     default:
02402       td->str = STR_LANDINFO_WAYPOINT;
02403       break;
02404   }
02405 }
02406 
02407 static void ChangeTileOwner_Track(TileIndex tile, Owner old_owner, Owner new_owner)
02408 {
02409   if (!IsTileOwner(tile, old_owner)) return;
02410 
02411   if (new_owner != INVALID_OWNER) {
02412     SetTileOwner(tile, new_owner);
02413   } else {
02414     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
02415   }
02416 }
02417 
02418 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
02419 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
02420 static const signed char _deltacoord_leaveoffset[8] = {
02421   -1,  0,  1,  0, /* x */
02422    0,  1,  0, -1  /* y */
02423 };
02424 
02425 
02431 int TicksToLeaveDepot(const Vehicle *v)
02432 {
02433   DiagDirection dir = GetRailDepotDirection(v->tile);
02434   int length = v->u.rail.cached_veh_length;
02435 
02436   switch (dir) {
02437     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
02438     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
02439     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
02440     default:
02441     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
02442   }
02443 
02444   return 0; // make compilers happy
02445 }
02446 
02449 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *v, TileIndex tile, int x, int y)
02450 {
02451   byte fract_coord;
02452   byte fract_coord_leave;
02453   DiagDirection dir;
02454   int length;
02455 
02456   /* this routine applies only to trains in depot tiles */
02457   if (v->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
02458 
02459   /* depot direction */
02460   dir = GetRailDepotDirection(tile);
02461 
02462   /* calculate the point where the following wagon should be activated
02463    * this depends on the length of the current vehicle */
02464   length = v->u.rail.cached_veh_length;
02465 
02466   fract_coord_leave =
02467     ((_fractcoords_enter[dir] & 0x0F) + // x
02468       (length + 1) * _deltacoord_leaveoffset[dir]) +
02469     (((_fractcoords_enter[dir] >> 4) +  // y
02470       ((length + 1) * _deltacoord_leaveoffset[dir+4])) << 4);
02471 
02472   fract_coord = (x & 0xF) + ((y & 0xF) << 4);
02473 
02474   if (_fractcoords_behind[dir] == fract_coord) {
02475     /* make sure a train is not entering the tile from behind */
02476     return VETSB_CANNOT_ENTER;
02477   } else if (_fractcoords_enter[dir] == fract_coord) {
02478     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
02479       /* enter the depot */
02480       v->u.rail.track = TRACK_BIT_DEPOT,
02481       v->vehstatus |= VS_HIDDEN; // hide it
02482       v->direction = ReverseDir(v->direction);
02483       if (v->Next() == NULL) VehicleEnterDepot(v);
02484       v->tile = tile;
02485 
02486       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
02487       return VETSB_ENTERED_WORMHOLE;
02488     }
02489   } else if (fract_coord_leave == fract_coord) {
02490     if (DiagDirToDir(dir) == v->direction) {
02491       /* leave the depot? */
02492       if ((v = v->Next()) != NULL) {
02493         v->vehstatus &= ~VS_HIDDEN;
02494         v->u.rail.track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
02495       }
02496     }
02497   }
02498 
02499   return VETSB_CONTINUE;
02500 }
02501 
02513 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, uint z_old, Slope tileh_old, uint z_new, Slope tileh_new, TrackBits rail_bits)
02514 {
02515   if (!_settings_game.construction.build_on_slopes || !AutoslopeEnabled()) return CMD_ERROR;
02516 
02517   /* Is the slope-rail_bits combination valid in general? I.e. is it safe to call GetRailFoundation() ? */
02518   if (CmdFailed(CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile))) return CMD_ERROR;
02519 
02520   /* Get the slopes on top of the foundations */
02521   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
02522   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
02523 
02524   Corner track_corner;
02525   switch (rail_bits) {
02526     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
02527     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
02528     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
02529     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
02530 
02531     /* Surface slope must not be changed */
02532     default: return (((z_old != z_new) || (tileh_old != tileh_new)) ? CMD_ERROR : CommandCost(EXPENSES_CONSTRUCTION, _price.terraform));
02533   }
02534 
02535   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
02536   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
02537   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
02538   if (z_old != z_new) return CMD_ERROR;
02539 
02540   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
02541   /* Make the ground dirty, if surface slope has changed */
02542   if (tileh_old != tileh_new) {
02543     /* If there is flat water on the lower halftile add the cost for clearing it */
02544     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price.clear_water);
02545     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
02546   }
02547   return  cost;
02548 }
02549 
02550 static CommandCost TerraformTile_Track(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
02551 {
02552   uint z_old;
02553   Slope tileh_old = GetTileSlope(tile, &z_old);
02554   if (IsPlainRailTile(tile)) {
02555     TrackBits rail_bits = GetTrackBits(tile);
02556     /* Is there flat water on the lower halftile, that must be cleared expensively? */
02557     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
02558 
02559     _error_message = STR_1008_MUST_REMOVE_RAILROAD_TRACK;
02560 
02561     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
02562     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
02563 
02564     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
02565     Corner allowed_corner;
02566     switch (rail_bits) {
02567       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
02568       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
02569       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
02570       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
02571       default: return autoslope_result;
02572     }
02573 
02574     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
02575 
02576     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
02577     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
02578 
02579     /* Everything is valid, which only changes allowed_corner */
02580     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
02581       if (allowed_corner == corner) continue;
02582       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
02583     }
02584 
02585     /* Make the ground dirty */
02586     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
02587 
02588     /* allow terraforming */
02589     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price.clear_water : (Money)0);
02590   } else {
02591     if (_settings_game.construction.build_on_slopes && AutoslopeEnabled()) {
02592       switch (GetRailTileType(tile)) {
02593         case RAIL_TILE_WAYPOINT: {
02594           CommandCost cost = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, GetRailWaypointBits(tile));
02595           if (!CmdFailed(cost)) return cost; // allow autoslope
02596           break;
02597         }
02598 
02599         case RAIL_TILE_DEPOT:
02600           if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
02601           break;
02602 
02603         default: NOT_REACHED();
02604       }
02605     }
02606   }
02607   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
02608 }
02609 
02610 
02611 extern const TileTypeProcs _tile_type_rail_procs = {
02612   DrawTile_Track,           // draw_tile_proc
02613   GetSlopeZ_Track,          // get_slope_z_proc
02614   ClearTile_Track,          // clear_tile_proc
02615   GetAcceptedCargo_Track,   // get_accepted_cargo_proc
02616   GetTileDesc_Track,        // get_tile_desc_proc
02617   GetTileTrackStatus_Track, // get_tile_track_status_proc
02618   ClickTile_Track,          // click_tile_proc
02619   NULL,                     // animate_tile_proc
02620   TileLoop_Track,           // tile_loop_clear
02621   ChangeTileOwner_Track,    // change_tile_owner_clear
02622   NULL,                     // get_produced_cargo_proc
02623   VehicleEnter_Track,       // vehicle_enter_tile_proc
02624   GetFoundation_Track,      // get_foundation_proc
02625   TerraformTile_Track,      // terraform_tile_proc
02626 };

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