rail_cmd.cpp

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00001 /* $Id: rail_cmd.cpp 18987 2010-02-02 22:27:03Z terkhen $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #include "stdafx.h"
00013 #include "cmd_helper.h"
00014 #include "landscape.h"
00015 #include "viewport_func.h"
00016 #include "command_func.h"
00017 #include "engine_base.h"
00018 #include "depot_base.h"
00019 #include "pathfinder/yapf/yapf_cache.h"
00020 #include "newgrf_engine.h"
00021 #include "landscape_type.h"
00022 #include "train.h"
00023 #include "variables.h"
00024 #include "autoslope.h"
00025 #include "water.h"
00026 #include "tunnelbridge_map.h"
00027 #include "window_func.h"
00028 #include "vehicle_func.h"
00029 #include "sound_func.h"
00030 #include "tunnelbridge.h"
00031 #include "functions.h"
00032 #include "elrail_func.h"
00033 #include "town.h"
00034 #include "pbs.h"
00035 #include "company_base.h"
00036 
00037 #include "table/strings.h"
00038 #include "table/sprites.h"
00039 #include "table/railtypes.h"
00040 #include "table/track_land.h"
00041 
00042 RailtypeInfo _railtypes[RAILTYPE_END];
00043 
00044 assert_compile(sizeof(_original_railtypes) <= sizeof(_railtypes));
00045 
00049 void ResetRailTypes()
00050 {
00051   memset(_railtypes, 0, sizeof(_railtypes));
00052   memcpy(_railtypes, _original_railtypes, sizeof(_original_railtypes));
00053 }
00054 
00055 RailType AllocateRailType(RailTypeLabel label)
00056 {
00057   for (RailType rt = RAILTYPE_BEGIN; rt != RAILTYPE_END; rt++) {
00058     RailtypeInfo *rti = &_railtypes[rt];
00059 
00060     if (rti->label == 0) {
00061       /* Set up new rail type */
00062       memcpy(rti, &_railtypes[RAILTYPE_RAIL], sizeof(*rti));
00063       rti->label = label;
00064 
00065       /* Make us compatible with ourself. */
00066       rti->powered_railtypes    = (RailTypes)(1 << rt);
00067       rti->compatible_railtypes = (RailTypes)(1 << rt);
00068       return rt;
00069     }
00070   }
00071 
00072   return INVALID_RAILTYPE;
00073 }
00074 
00075 static const byte _track_sloped_sprites[14] = {
00076   14, 15, 22, 13,
00077    0, 21, 17, 12,
00078   23,  0, 18, 20,
00079   19, 16
00080 };
00081 
00082 
00083 /*         4
00084  *     ---------
00085  *    |\       /|
00086  *    | \    1/ |
00087  *    |  \   /  |
00088  *    |   \ /   |
00089  *  16|    \    |32
00090  *    |   / \2  |
00091  *    |  /   \  |
00092  *    | /     \ |
00093  *    |/       \|
00094  *     ---------
00095  *         8
00096  */
00097 
00098 
00099 
00100 /* MAP2 byte:    abcd???? => Signal On? Same coding as map3lo
00101  * MAP3LO byte:  abcd???? => Signal Exists?
00102  *               a and b are for diagonals, upper and left,
00103  *               one for each direction. (ie a == NE->SW, b ==
00104  *               SW->NE, or v.v., I don't know. b and c are
00105  *               similar for lower and right.
00106  * MAP2 byte:    ????abcd => Type of ground.
00107  * MAP3LO byte:  ????abcd => Type of rail.
00108  * MAP5:         00abcdef => rail
00109  *               01abcdef => rail w/ signals
00110  *               10uuuuuu => unused
00111  *               11uuuudd => rail depot
00112  */
00113 
00114 
00115 Vehicle *EnsureNoTrainOnTrackProc(Vehicle *v, void *data)
00116 {
00117   TrackBits rail_bits = *(TrackBits *)data;
00118 
00119   if (v->type != VEH_TRAIN) return NULL;
00120 
00121   Train *t = Train::From(v);
00122   if ((t->track != rail_bits) && !TracksOverlap(t->track | rail_bits)) return NULL;
00123 
00124   _error_message = STR_ERROR_TRAIN_IN_THE_WAY + v->type;
00125   return v;
00126 }
00127 
00135 static bool EnsureNoTrainOnTrack(TileIndex tile, Track track)
00136 {
00137   TrackBits rail_bits = TrackToTrackBits(track);
00138 
00139   return !HasVehicleOnPos(tile, &rail_bits, &EnsureNoTrainOnTrackProc);
00140 }
00141 
00142 static bool CheckTrackCombination(TileIndex tile, TrackBits to_build, uint flags)
00143 {
00144   TrackBits current; // The current track layout
00145   TrackBits future;  // The track layout we want to build
00146   _error_message = STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION;
00147 
00148   if (!IsPlainRail(tile)) return false;
00149 
00150   /* So, we have a tile with tracks on it (and possibly signals). Let's see
00151    * what tracks first */
00152   current = GetTrackBits(tile);
00153   future = current | to_build;
00154 
00155   /* Are we really building something new? */
00156   if (current == future) {
00157     /* Nothing new is being built */
00158     _error_message = STR_ERROR_ALREADY_BUILT;
00159     return false;
00160   }
00161 
00162   /* Let's see if we may build this */
00163   if ((flags & DC_NO_RAIL_OVERLAP) || HasSignals(tile)) {
00164     /* If we are not allowed to overlap (flag is on for ai companies or we have
00165      * signals on the tile), check that */
00166     return future == TRACK_BIT_HORZ || future == TRACK_BIT_VERT;
00167   } else {
00168     /* Normally, we may overlap and any combination is valid */
00169     return true;
00170   }
00171 }
00172 
00173 
00175 static const TrackBits _valid_tracks_without_foundation[15] = {
00176   TRACK_BIT_ALL,
00177   TRACK_BIT_RIGHT,
00178   TRACK_BIT_UPPER,
00179   TRACK_BIT_X,
00180 
00181   TRACK_BIT_LEFT,
00182   TRACK_BIT_NONE,
00183   TRACK_BIT_Y,
00184   TRACK_BIT_LOWER,
00185 
00186   TRACK_BIT_LOWER,
00187   TRACK_BIT_Y,
00188   TRACK_BIT_NONE,
00189   TRACK_BIT_LEFT,
00190 
00191   TRACK_BIT_X,
00192   TRACK_BIT_UPPER,
00193   TRACK_BIT_RIGHT,
00194 };
00195 
00197 static const TrackBits _valid_tracks_on_leveled_foundation[15] = {
00198   TRACK_BIT_NONE,
00199   TRACK_BIT_LEFT,
00200   TRACK_BIT_LOWER,
00201   TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,
00202 
00203   TRACK_BIT_RIGHT,
00204   TRACK_BIT_ALL,
00205   TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,
00206   TRACK_BIT_ALL,
00207 
00208   TRACK_BIT_UPPER,
00209   TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,
00210   TRACK_BIT_ALL,
00211   TRACK_BIT_ALL,
00212 
00213   TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,
00214   TRACK_BIT_ALL,
00215   TRACK_BIT_ALL
00216 };
00217 
00225 Foundation GetRailFoundation(Slope tileh, TrackBits bits)
00226 {
00227   if (bits == TRACK_BIT_NONE) return FOUNDATION_NONE;
00228 
00229   if (IsSteepSlope(tileh)) {
00230     /* Test for inclined foundations */
00231     if (bits == TRACK_BIT_X) return FOUNDATION_INCLINED_X;
00232     if (bits == TRACK_BIT_Y) return FOUNDATION_INCLINED_Y;
00233 
00234     /* Get higher track */
00235     Corner highest_corner = GetHighestSlopeCorner(tileh);
00236     TrackBits higher_track = CornerToTrackBits(highest_corner);
00237 
00238     /* Only higher track? */
00239     if (bits == higher_track) return HalftileFoundation(highest_corner);
00240 
00241     /* Overlap with higher track? */
00242     if (TracksOverlap(bits | higher_track)) return FOUNDATION_INVALID;
00243 
00244     /* either lower track or both higher and lower track */
00245     return ((bits & higher_track) != 0 ? FOUNDATION_STEEP_BOTH : FOUNDATION_STEEP_LOWER);
00246   } else {
00247     if ((~_valid_tracks_without_foundation[tileh] & bits) == 0) return FOUNDATION_NONE;
00248 
00249     bool valid_on_leveled = ((~_valid_tracks_on_leveled_foundation[tileh] & bits) == 0);
00250 
00251     Corner track_corner;
00252     switch (bits) {
00253       case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
00254       case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
00255       case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
00256       case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
00257 
00258       case TRACK_BIT_HORZ:
00259         if (tileh == SLOPE_N) return HalftileFoundation(CORNER_N);
00260         if (tileh == SLOPE_S) return HalftileFoundation(CORNER_S);
00261         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00262 
00263       case TRACK_BIT_VERT:
00264         if (tileh == SLOPE_W) return HalftileFoundation(CORNER_W);
00265         if (tileh == SLOPE_E) return HalftileFoundation(CORNER_E);
00266         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00267 
00268       case TRACK_BIT_X:
00269         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_X;
00270         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00271 
00272       case TRACK_BIT_Y:
00273         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_Y;
00274         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00275 
00276       default:
00277         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
00278     }
00279     /* Single diagonal track */
00280 
00281     /* Track must be at least valid on leveled foundation */
00282     if (!valid_on_leveled) return FOUNDATION_INVALID;
00283 
00284     /* If slope has three raised corners, build leveled foundation */
00285     if (IsSlopeWithThreeCornersRaised(tileh)) return FOUNDATION_LEVELED;
00286 
00287     /* If neighboured corners of track_corner are lowered, build halftile foundation */
00288     if ((tileh & SlopeWithThreeCornersRaised(OppositeCorner(track_corner))) == SlopeWithOneCornerRaised(track_corner)) return HalftileFoundation(track_corner);
00289 
00290     /* else special anti-zig-zag foundation */
00291     return SpecialRailFoundation(track_corner);
00292   }
00293 }
00294 
00295 
00305 static CommandCost CheckRailSlope(Slope tileh, TrackBits rail_bits, TrackBits existing, TileIndex tile)
00306 {
00307   /* don't allow building on the lower side of a coast */
00308   if (IsTileType(tile, MP_WATER) || (IsTileType(tile, MP_RAILWAY) && (GetRailGroundType(tile) == RAIL_GROUND_WATER))) {
00309     if (!IsSteepSlope(tileh) && ((~_valid_tracks_on_leveled_foundation[tileh] & (rail_bits | existing)) != 0)) return_cmd_error(STR_ERROR_CAN_T_BUILD_ON_WATER);
00310   }
00311 
00312   Foundation f_new = GetRailFoundation(tileh, rail_bits | existing);
00313 
00314   /* check track/slope combination */
00315   if ((f_new == FOUNDATION_INVALID) ||
00316       ((f_new != FOUNDATION_NONE) && (!_settings_game.construction.build_on_slopes))) {
00317     return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00318   }
00319 
00320   Foundation f_old = GetRailFoundation(tileh, existing);
00321   return CommandCost(EXPENSES_CONSTRUCTION, f_new != f_old ? _price[PR_BUILD_FOUNDATION] : (Money)0);
00322 }
00323 
00324 /* Validate functions for rail building */
00325 static inline bool ValParamTrackOrientation(Track track) {return IsValidTrack(track);}
00326 
00335 CommandCost CmdBuildSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00336 {
00337   Slope tileh;
00338   RailType railtype = (RailType)p1;
00339   Track track = (Track)p2;
00340   TrackBits trackbit;
00341   CommandCost cost(EXPENSES_CONSTRUCTION);
00342   CommandCost ret;
00343 
00344   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
00345 
00346   tileh = GetTileSlope(tile, NULL);
00347   trackbit = TrackToTrackBits(track);
00348 
00349   switch (GetTileType(tile)) {
00350     case MP_RAILWAY:
00351       if (!CheckTileOwnership(tile)) return CMD_ERROR;
00352 
00353       if (!IsPlainRail(tile)) return CMD_ERROR;
00354 
00355       if (!IsCompatibleRail(GetRailType(tile), railtype)) return_cmd_error(STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION);
00356 
00357       if (!CheckTrackCombination(tile, trackbit, flags) ||
00358           !EnsureNoTrainOnTrack(tile, track)) {
00359         return CMD_ERROR;
00360       }
00361 
00362       ret = CheckRailSlope(tileh, trackbit, GetTrackBits(tile), tile);
00363       if (ret.Failed()) return ret;
00364       cost.AddCost(ret);
00365 
00366       /* If the rail types don't match, try to convert only if engines of
00367        * the new rail type are not powered on the present rail type and engines of
00368        * the present rail type are powered on the new rail type. */
00369       if (GetRailType(tile) != railtype && !HasPowerOnRail(railtype, GetRailType(tile))) {
00370         if (HasPowerOnRail(GetRailType(tile), railtype)) {
00371           ret = DoCommand(tile, tile, railtype, flags, CMD_CONVERT_RAIL);
00372           if (ret.Failed()) return ret;
00373           cost.AddCost(ret);
00374         } else {
00375           return CMD_ERROR;
00376         }
00377       }
00378 
00379       if (flags & DC_EXEC) {
00380         SetRailGroundType(tile, RAIL_GROUND_BARREN);
00381         SetTrackBits(tile, GetTrackBits(tile) | trackbit);
00382       }
00383       break;
00384 
00385     case MP_ROAD:
00386 #define M(x) (1 << (x))
00387       /* Level crossings may only be built on these slopes */
00388       if (!HasBit(M(SLOPE_SEN) | M(SLOPE_ENW) | M(SLOPE_NWS) | M(SLOPE_NS) | M(SLOPE_WSE) | M(SLOPE_EW) | M(SLOPE_FLAT), tileh)) {
00389         return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
00390       }
00391 #undef M
00392 
00393       if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00394 
00395       if (IsNormalRoad(tile)) {
00396         if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
00397 
00398         if (GetDisallowedRoadDirections(tile) != DRD_NONE) return_cmd_error(STR_ERROR_CROSSING_ON_ONEWAY_ROAD);
00399 
00400         RoadTypes roadtypes = GetRoadTypes(tile);
00401         RoadBits road = GetRoadBits(tile, ROADTYPE_ROAD);
00402         RoadBits tram = GetRoadBits(tile, ROADTYPE_TRAM);
00403         switch (roadtypes) {
00404           default: break;
00405           case ROADTYPES_TRAM:
00406             /* Tram crossings must always have road. */
00407             if (flags & DC_EXEC) SetRoadOwner(tile, ROADTYPE_ROAD, _current_company);
00408             roadtypes |= ROADTYPES_ROAD;
00409             break;
00410 
00411           case ROADTYPES_ALL:
00412             if (road != tram) return CMD_ERROR;
00413             break;
00414         }
00415 
00416         road |= tram;
00417 
00418         if ((track == TRACK_X && road == ROAD_Y) ||
00419             (track == TRACK_Y && road == ROAD_X)) {
00420           if (flags & DC_EXEC) {
00421             MakeRoadCrossing(tile, GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), _current_company, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, roadtypes, GetTownIndex(tile));
00422             UpdateLevelCrossing(tile, false);
00423           }
00424           break;
00425         }
00426       }
00427 
00428       if (IsLevelCrossing(tile) && GetCrossingRailBits(tile) == trackbit) {
00429         return_cmd_error(STR_ERROR_ALREADY_BUILT);
00430       }
00431       /* FALLTHROUGH */
00432 
00433     default:
00434       /* Will there be flat water on the lower halftile? */
00435       bool water_ground = IsTileType(tile, MP_WATER) && IsSlopeWithOneCornerRaised(tileh);
00436 
00437       ret = CheckRailSlope(tileh, trackbit, TRACK_BIT_NONE, tile);
00438       if (ret.Failed()) return ret;
00439       cost.AddCost(ret);
00440 
00441       ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00442       if (ret.Failed()) return ret;
00443       cost.AddCost(ret);
00444 
00445       if (water_ground) {
00446         cost.AddCost(-_price[PR_CLEAR_WATER]);
00447         cost.AddCost(_price[PR_CLEAR_ROUGH]);
00448       }
00449 
00450       if (flags & DC_EXEC) {
00451         MakeRailNormal(tile, _current_company, trackbit, railtype);
00452         if (water_ground) SetRailGroundType(tile, RAIL_GROUND_WATER);
00453       }
00454       break;
00455   }
00456 
00457   if (flags & DC_EXEC) {
00458     MarkTileDirtyByTile(tile);
00459     AddTrackToSignalBuffer(tile, track, _current_company);
00460     YapfNotifyTrackLayoutChange(tile, track);
00461   }
00462 
00463   return cost.AddCost(RailBuildCost(railtype));
00464 }
00465 
00474 CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00475 {
00476   Track track = (Track)p2;
00477   TrackBits trackbit;
00478   CommandCost cost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_RAIL] );
00479   bool crossing = false;
00480 
00481   if (!ValParamTrackOrientation((Track)p2)) return CMD_ERROR;
00482   trackbit = TrackToTrackBits(track);
00483 
00484   /* Need to read tile owner now because it may change when the rail is removed
00485    * Also, in case of floods, _current_company != owner
00486    * There may be invalid tiletype even in exec run (when removing long track),
00487    * so do not call GetTileOwner(tile) in any case here */
00488   Owner owner = INVALID_OWNER;
00489 
00490   Train *v = NULL;
00491 
00492   switch (GetTileType(tile)) {
00493     case MP_ROAD: {
00494       if (!IsLevelCrossing(tile) ||
00495           GetCrossingRailBits(tile) != trackbit ||
00496           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
00497           (!(flags & DC_BANKRUPT) && !EnsureNoVehicleOnGround(tile))) {
00498         return CMD_ERROR;
00499       }
00500 
00501       if (flags & DC_EXEC) {
00502         if (HasReservedTracks(tile, trackbit)) {
00503           v = GetTrainForReservation(tile, track);
00504           if (v != NULL) FreeTrainTrackReservation(v);
00505         }
00506         owner = GetTileOwner(tile);
00507         MakeRoadNormal(tile, GetCrossingRoadBits(tile), GetRoadTypes(tile), GetTownIndex(tile), GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM));
00508       }
00509       break;
00510     }
00511 
00512     case MP_RAILWAY: {
00513       TrackBits present;
00514 
00515       if (!IsPlainRail(tile) ||
00516           (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
00517           !EnsureNoTrainOnTrack(tile, track)) {
00518         return CMD_ERROR;
00519       }
00520 
00521       present = GetTrackBits(tile);
00522       if ((present & trackbit) == 0) return CMD_ERROR;
00523       if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
00524 
00525       /* Charge extra to remove signals on the track, if they are there */
00526       if (HasSignalOnTrack(tile, track))
00527         cost.AddCost(DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS));
00528 
00529       if (flags & DC_EXEC) {
00530         if (HasReservedTracks(tile, trackbit)) {
00531           v = GetTrainForReservation(tile, track);
00532           if (v != NULL) FreeTrainTrackReservation(v);
00533         }
00534         owner = GetTileOwner(tile);
00535         present ^= trackbit;
00536         if (present == 0) {
00537           Slope tileh = GetTileSlope(tile, NULL);
00538           /* If there is flat water on the lower halftile, convert the tile to shore so the water remains */
00539           if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh)) {
00540             MakeShore(tile);
00541           } else {
00542             DoClearSquare(tile);
00543           }
00544         } else {
00545           SetTrackBits(tile, present);
00546           SetTrackReservation(tile, GetRailReservationTrackBits(tile) & present);
00547         }
00548       }
00549       break;
00550     }
00551 
00552     default: return CMD_ERROR;
00553   }
00554 
00555   if (flags & DC_EXEC) {
00556     /* if we got that far, 'owner' variable is set correctly */
00557     assert(Company::IsValidID(owner));
00558 
00559     MarkTileDirtyByTile(tile);
00560     if (crossing) {
00561       /* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we
00562        * are removing one of these pieces, we'll need to update signals for
00563        * both directions explicitly, as after the track is removed it won't
00564        * 'connect' with the other piece. */
00565       AddTrackToSignalBuffer(tile, TRACK_X, owner);
00566       AddTrackToSignalBuffer(tile, TRACK_Y, owner);
00567       YapfNotifyTrackLayoutChange(tile, TRACK_X);
00568       YapfNotifyTrackLayoutChange(tile, TRACK_Y);
00569     } else {
00570       AddTrackToSignalBuffer(tile, track, owner);
00571       YapfNotifyTrackLayoutChange(tile, track);
00572     }
00573 
00574     if (v != NULL) TryPathReserve(v, true);
00575   }
00576 
00577   return cost;
00578 }
00579 
00580 
00588 bool FloodHalftile(TileIndex t)
00589 {
00590   assert(IsPlainRailTile(t));
00591 
00592   bool flooded = false;
00593   if (GetRailGroundType(t) == RAIL_GROUND_WATER) return flooded;
00594 
00595   Slope tileh = GetTileSlope(t, NULL);
00596   TrackBits rail_bits = GetTrackBits(t);
00597 
00598   if (IsSlopeWithOneCornerRaised(tileh)) {
00599     TrackBits lower_track = CornerToTrackBits(OppositeCorner(GetHighestSlopeCorner(tileh)));
00600 
00601     TrackBits to_remove = lower_track & rail_bits;
00602     if (to_remove != 0) {
00603       _current_company = OWNER_WATER;
00604       if (DoCommand(t, 0, FIND_FIRST_BIT(to_remove), DC_EXEC, CMD_REMOVE_SINGLE_RAIL).Failed()) return flooded; // not yet floodable
00605       flooded = true;
00606       rail_bits = rail_bits & ~to_remove;
00607       if (rail_bits == 0) {
00608         MakeShore(t);
00609         MarkTileDirtyByTile(t);
00610         return flooded;
00611       }
00612     }
00613 
00614     if (IsNonContinuousFoundation(GetRailFoundation(tileh, rail_bits))) {
00615       flooded = true;
00616       SetRailGroundType(t, RAIL_GROUND_WATER);
00617       MarkTileDirtyByTile(t);
00618     }
00619   } else {
00620     /* Make shore on steep slopes and 'three-corners-raised'-slopes. */
00621     if (ApplyFoundationToSlope(GetRailFoundation(tileh, rail_bits), &tileh) == 0) {
00622       if (IsSteepSlope(tileh) || IsSlopeWithThreeCornersRaised(tileh)) {
00623         flooded = true;
00624         SetRailGroundType(t, RAIL_GROUND_WATER);
00625         MarkTileDirtyByTile(t);
00626       }
00627     }
00628   }
00629   return flooded;
00630 }
00631 
00632 static const TileIndexDiffC _trackdelta[] = {
00633   { -1,  0 }, {  0,  1 }, { -1,  0 }, {  0,  1 }, {  1,  0 }, {  0,  1 },
00634   {  0,  0 },
00635   {  0,  0 },
00636   {  1,  0 }, {  0, -1 }, {  0, -1 }, {  1,  0 }, {  0, -1 }, { -1,  0 },
00637   {  0,  0 },
00638   {  0,  0 }
00639 };
00640 
00641 
00642 static CommandCost ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)
00643 {
00644   int x = TileX(start);
00645   int y = TileY(start);
00646   int ex = TileX(end);
00647   int ey = TileY(end);
00648   int dx, dy, trdx, trdy;
00649 
00650   if (!ValParamTrackOrientation(TrackdirToTrack(*trackdir))) return CMD_ERROR;
00651 
00652   /* calculate delta x,y from start to end tile */
00653   dx = ex - x;
00654   dy = ey - y;
00655 
00656   /* calculate delta x,y for the first direction */
00657   trdx = _trackdelta[*trackdir].x;
00658   trdy = _trackdelta[*trackdir].y;
00659 
00660   if (!IsDiagonalTrackdir(*trackdir)) {
00661     trdx += _trackdelta[*trackdir ^ 1].x;
00662     trdy += _trackdelta[*trackdir ^ 1].y;
00663   }
00664 
00665   /* validate the direction */
00666   while (
00667     (trdx <= 0 && dx > 0) ||
00668     (trdx >= 0 && dx < 0) ||
00669     (trdy <= 0 && dy > 0) ||
00670     (trdy >= 0 && dy < 0)
00671   ) {
00672     if (!HasBit(*trackdir, 3)) { // first direction is invalid, try the other
00673       SetBit(*trackdir, 3); // reverse the direction
00674       trdx = -trdx;
00675       trdy = -trdy;
00676     } else { // other direction is invalid too, invalid drag
00677       return CMD_ERROR;
00678     }
00679   }
00680 
00681   /* (for diagonal tracks, this is already made sure of by above test), but:
00682    * for non-diagonal tracks, check if the start and end tile are on 1 line */
00683   if (!IsDiagonalTrackdir(*trackdir)) {
00684     trdx = _trackdelta[*trackdir].x;
00685     trdy = _trackdelta[*trackdir].y;
00686     if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx))
00687       return CMD_ERROR;
00688   }
00689 
00690   return CommandCost();
00691 }
00692 
00705 static CommandCost CmdRailTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00706 {
00707   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
00708   Track track = (Track)GB(p2, 4, 3);
00709   bool remove = HasBit(p2, 7);
00710   RailType railtype = (RailType)GB(p2, 0, 4);
00711 
00712   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
00713   if (p1 >= MapSize()) return CMD_ERROR;
00714   TileIndex end_tile = p1;
00715   Trackdir trackdir = TrackToTrackdir(track);
00716 
00717   if (ValidateAutoDrag(&trackdir, tile, end_tile).Failed()) return CMD_ERROR;
00718 
00719   if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, tile);
00720 
00721   for (;;) {
00722     ret = DoCommand(tile, railtype, TrackdirToTrack(trackdir), flags, remove ? CMD_REMOVE_SINGLE_RAIL : CMD_BUILD_SINGLE_RAIL);
00723 
00724     if (ret.Failed()) {
00725       if (_error_message != STR_ERROR_ALREADY_BUILT && !remove) {
00726         if (HasBit(p2, 8)) return CMD_ERROR;
00727         break;
00728       }
00729       _error_message = INVALID_STRING_ID;
00730     } else {
00731       total_cost.AddCost(ret);
00732     }
00733 
00734     if (tile == end_tile) break;
00735 
00736     tile += ToTileIndexDiff(_trackdelta[trackdir]);
00737 
00738     /* toggle railbit for the non-diagonal tracks */
00739     if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
00740   }
00741 
00742   return (total_cost.GetCost() == 0) ? CommandCost(remove ? INVALID_STRING_ID : (_error_message == INVALID_STRING_ID ? STR_ERROR_ALREADY_BUILT : _error_message)) : total_cost;
00743 }
00744 
00758 CommandCost CmdBuildRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00759 {
00760   return CmdRailTrackHelper(tile, flags, p1, ClrBit(p2, 7), text);
00761 }
00762 
00776 CommandCost CmdRemoveRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00777 {
00778   return CmdRailTrackHelper(tile, flags, p1, SetBit(p2, 7), text);
00779 }
00780 
00792 CommandCost CmdBuildTrainDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00793 {
00794   Slope tileh;
00795 
00796   /* check railtype and valid direction for depot (0 through 3), 4 in total */
00797   if (!ValParamRailtype((RailType)p1)) return CMD_ERROR;
00798 
00799   tileh = GetTileSlope(tile, NULL);
00800 
00801   DiagDirection dir = Extract<DiagDirection, 0>(p2);
00802 
00803   /* Prohibit construction if
00804    * The tile is non-flat AND
00805    * 1) build-on-slopes is disabled
00806    * 2) the tile is steep i.e. spans two height levels
00807    * 3) the exit points in the wrong direction
00808    */
00809 
00810   if (tileh != SLOPE_FLAT && (
00811         !_settings_game.construction.build_on_slopes ||
00812         IsSteepSlope(tileh) ||
00813         !CanBuildDepotByTileh(dir, tileh)
00814       )) {
00815     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00816   }
00817 
00818   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00819   if (cost.Failed()) return CMD_ERROR;
00820 
00821   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
00822 
00823   if (!Depot::CanAllocateItem()) return CMD_ERROR;
00824 
00825   if (flags & DC_EXEC) {
00826     Depot *d = new Depot(tile);
00827     d->town_index = ClosestTownFromTile(tile, UINT_MAX)->index;
00828 
00829     MakeRailDepot(tile, _current_company, d->index, dir, (RailType)p1);
00830     MarkTileDirtyByTile(tile);
00831 
00832     AddSideToSignalBuffer(tile, INVALID_DIAGDIR, _current_company);
00833     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
00834   }
00835 
00836   return cost.AddCost(_price[PR_BUILD_DEPOT_TRAIN]);
00837 }
00838 
00859 CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00860 {
00861   Track track = (Track)GB(p1, 0, 3);
00862   bool ctrl_pressed = HasBit(p1, 3); // was the CTRL button pressed
00863   SignalVariant sigvar = (ctrl_pressed ^ HasBit(p1, 4)) ? SIG_SEMAPHORE : SIG_ELECTRIC; // the signal variant of the new signal
00864   SignalType sigtype = (SignalType)GB(p1, 5, 3); // the signal type of the new signal
00865   bool convert_signal = HasBit(p1, 8); // convert button pressed
00866   SignalType cycle_start = (SignalType)GB(p1, 9, 3);
00867   SignalType cycle_stop = (SignalType)GB(p1, 12, 3);
00868   CommandCost cost;
00869   uint num_dir_cycle = GB(p1, 15, 2);
00870 
00871   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
00872 
00873   /* You can only build signals on plain rail tiles, and the selected track must exist */
00874   if (!ValParamTrackOrientation(track) || !IsPlainRailTile(tile) ||
00875       !HasTrack(tile, track) || !EnsureNoTrainOnTrack(tile, track)) {
00876     return CMD_ERROR;
00877   }
00878 
00879   /* Protect against invalid signal copying */
00880   if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
00881 
00882   if (!CheckTileOwnership(tile)) return CMD_ERROR;
00883 
00884   {
00885     /* See if this is a valid track combination for signals, (ie, no overlap) */
00886     TrackBits trackbits = GetTrackBits(tile);
00887     if (KillFirstBit(trackbits) != TRACK_BIT_NONE && // More than one track present
00888         trackbits != TRACK_BIT_HORZ &&
00889         trackbits != TRACK_BIT_VERT) {
00890       return_cmd_error(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK);
00891     }
00892   }
00893 
00894   /* In case we don't want to change an existing signal, return without error. */
00895   if (HasBit(p1, 17) && HasSignalOnTrack(tile, track)) return CommandCost();
00896 
00897   /* you can not convert a signal if no signal is on track */
00898   if (convert_signal && !HasSignalOnTrack(tile, track)) return CMD_ERROR;
00899 
00900   if (!HasSignalOnTrack(tile, track)) {
00901     /* build new signals */
00902     cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS]);
00903   } else {
00904     if (p2 != 0 && sigvar != GetSignalVariant(tile, track)) {
00905       /* convert signals <-> semaphores */
00906       cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
00907 
00908     } else if (convert_signal) {
00909       /* convert button pressed */
00910       if (ctrl_pressed || GetSignalVariant(tile, track) != sigvar) {
00911         /* convert electric <-> semaphore */
00912         cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
00913       } else {
00914         /* it is free to change signal type: normal-pre-exit-combo */
00915         cost = CommandCost();
00916       }
00917 
00918     } else {
00919       /* it is free to change orientation/pre-exit-combo signals */
00920       cost = CommandCost();
00921     }
00922   }
00923 
00924   if (flags & DC_EXEC) {
00925     Train *v = NULL;
00926     /* The new/changed signal could block our path. As this can lead to
00927      * stale reservations, we clear the path reservation here and try
00928      * to redo it later on. */
00929     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
00930       v = GetTrainForReservation(tile, track);
00931       if (v != NULL) FreeTrainTrackReservation(v);
00932     }
00933 
00934     if (!HasSignals(tile)) {
00935       /* there are no signals at all on this tile yet */
00936       SetHasSignals(tile, true);
00937       SetSignalStates(tile, 0xF); // all signals are on
00938       SetPresentSignals(tile, 0); // no signals built by default
00939       SetSignalType(tile, track, sigtype);
00940       SetSignalVariant(tile, track, sigvar);
00941     }
00942 
00943     if (p2 == 0) {
00944       if (!HasSignalOnTrack(tile, track)) {
00945         /* build new signals */
00946         SetPresentSignals(tile, GetPresentSignals(tile) | (IsPbsSignal(sigtype) ? KillFirstBit(SignalOnTrack(track)) : SignalOnTrack(track)));
00947         SetSignalType(tile, track, sigtype);
00948         SetSignalVariant(tile, track, sigvar);
00949         while (num_dir_cycle-- > 0) CycleSignalSide(tile, track);
00950       } else {
00951         if (convert_signal) {
00952           /* convert signal button pressed */
00953           if (ctrl_pressed) {
00954             /* toggle the pressent signal variant: SIG_ELECTRIC <-> SIG_SEMAPHORE */
00955             SetSignalVariant(tile, track, (GetSignalVariant(tile, track) == SIG_ELECTRIC) ? SIG_SEMAPHORE : SIG_ELECTRIC);
00956             /* Query current signal type so the check for PBS signals below works. */
00957             sigtype = GetSignalType(tile, track);
00958           } else {
00959             /* convert the present signal to the chosen type and variant */
00960             SetSignalType(tile, track, sigtype);
00961             SetSignalVariant(tile, track, sigvar);
00962             if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
00963               SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
00964             }
00965           }
00966 
00967         } else if (ctrl_pressed) {
00968           /* cycle between cycle_start and cycle_end */
00969           sigtype = (SignalType)(GetSignalType(tile, track) + 1);
00970 
00971           if (sigtype < cycle_start || sigtype > cycle_stop) sigtype = cycle_start;
00972 
00973           SetSignalType(tile, track, sigtype);
00974           if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
00975             SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
00976           }
00977         } else {
00978           /* cycle the signal side: both -> left -> right -> both -> ... */
00979           CycleSignalSide(tile, track);
00980           /* Query current signal type so the check for PBS signals below works. */
00981           sigtype = GetSignalType(tile, track);
00982         }
00983       }
00984     } else {
00985       /* If CmdBuildManySignals is called with copying signals, just copy the
00986        * direction of the first signal given as parameter by CmdBuildManySignals */
00987       SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | (p2 & SignalOnTrack(track)));
00988       SetSignalVariant(tile, track, sigvar);
00989       SetSignalType(tile, track, sigtype);
00990     }
00991 
00992     if (IsPbsSignal(sigtype)) {
00993       /* PBS signals should show red unless they are on a reservation. */
00994       uint mask = GetPresentSignals(tile) & SignalOnTrack(track);
00995       SetSignalStates(tile, (GetSignalStates(tile) & ~mask) | ((HasBit(GetRailReservationTrackBits(tile), track) ? UINT_MAX : 0) & mask));
00996     }
00997     MarkTileDirtyByTile(tile);
00998     AddTrackToSignalBuffer(tile, track, _current_company);
00999     YapfNotifyTrackLayoutChange(tile, track);
01000     if (v != NULL) {
01001       /* Extend the train's path if it's not stopped or loading, or not at a safe position. */
01002       if (!(((v->vehstatus & VS_STOPPED) && v->cur_speed == 0) || v->current_order.IsType(OT_LOADING)) ||
01003           !IsSafeWaitingPosition(v, v->tile, v->GetVehicleTrackdir(), true, _settings_game.pf.forbid_90_deg)) {
01004         TryPathReserve(v, true);
01005       }
01006     }
01007   }
01008 
01009   return cost;
01010 }
01011 
01012 static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
01013 {
01014   tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
01015   if (tile == INVALID_TILE) return false;
01016 
01017   /* Check for track bits on the new tile */
01018   TrackdirBits trackdirbits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
01019 
01020   if (TracksOverlap(TrackdirBitsToTrackBits(trackdirbits))) return false;
01021   trackdirbits &= TrackdirReachesTrackdirs(trackdir);
01022 
01023   /* No track bits, must stop */
01024   if (trackdirbits == TRACKDIR_BIT_NONE) return false;
01025 
01026   /* Get the first track dir */
01027   trackdir = RemoveFirstTrackdir(&trackdirbits);
01028 
01029   /* Any left? It's a junction so we stop */
01030   if (trackdirbits != TRACKDIR_BIT_NONE) return false;
01031 
01032   switch (GetTileType(tile)) {
01033     case MP_RAILWAY:
01034       if (IsRailDepot(tile)) return false;
01035       if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
01036       signal_ctr++;
01037       if (IsDiagonalTrackdir(trackdir)) {
01038         signal_ctr++;
01039         /* Ensure signal_ctr even so X and Y pieces get signals */
01040         ClrBit(signal_ctr, 0);
01041       }
01042       return true;
01043 
01044     case MP_ROAD:
01045       if (!IsLevelCrossing(tile)) return false;
01046       signal_ctr += 2;
01047       return true;
01048 
01049     case MP_TUNNELBRIDGE: {
01050       TileIndex orig_tile = tile; // backup old value
01051 
01052       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
01053       if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
01054 
01055       /* Skip to end of tunnel or bridge
01056        * note that tile is a parameter by reference, so it must be updated */
01057       tile = GetOtherTunnelBridgeEnd(tile);
01058 
01059       signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
01060       return true;
01061     }
01062 
01063     default: return false;
01064   }
01065 }
01066 
01082 static CommandCost CmdSignalTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01083 {
01084   CommandCost ret, total_cost(EXPENSES_CONSTRUCTION);
01085   int signal_ctr;
01086   byte signals;
01087   bool err = true;
01088   TileIndex end_tile;
01089   TileIndex start_tile = tile;
01090 
01091   Track track = (Track)GB(p2, 0, 3);
01092   bool mode = HasBit(p2, 3);
01093   bool semaphores = HasBit(p2, 4);
01094   bool remove = HasBit(p2, 5);
01095   bool autofill = HasBit(p2, 6);
01096   Trackdir trackdir = TrackToTrackdir(track);
01097   byte signal_density = GB(p2, 24, 8);
01098 
01099   if (p1 >= MapSize()) return CMD_ERROR;
01100   end_tile = p1;
01101   if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
01102 
01103   if (!IsPlainRailTile(tile)) return CMD_ERROR;
01104 
01105   /* for vertical/horizontal tracks, double the given signals density
01106    * since the original amount will be too dense (shorter tracks) */
01107   signal_density *= 2;
01108 
01109   if (ValidateAutoDrag(&trackdir, tile, end_tile).Failed()) return CMD_ERROR;
01110 
01111   track = TrackdirToTrack(trackdir); // trackdir might have changed, keep track in sync
01112   Trackdir start_trackdir = trackdir;
01113 
01114   /* Must start on a valid track to be able to avoid loops */
01115   if (!HasTrack(tile, track)) return CMD_ERROR;
01116 
01117   SignalType sigtype = (SignalType)GB(p2, 7, 3);
01118   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
01119 
01120   /* copy the signal-style of the first rail-piece if existing */
01121   if (HasSignalOnTrack(tile, track)) {
01122     signals = GetPresentSignals(tile) & SignalOnTrack(track);
01123     assert(signals != 0);
01124 
01125     /* copy signal/semaphores style (independent of CTRL) */
01126     semaphores = GetSignalVariant(tile, track) != SIG_ELECTRIC;
01127 
01128     sigtype = GetSignalType(tile, track);
01129     /* Don't but copy pre-signal type */
01130     if (sigtype < SIGTYPE_PBS) sigtype = SIGTYPE_NORMAL;
01131   } else { // no signals exist, drag a two-way signal stretch
01132     signals = IsPbsSignal(sigtype) ? SignalAlongTrackdir(trackdir) : SignalOnTrack(track);
01133   }
01134 
01135   byte signal_dir = 0;
01136   if (signals & SignalAlongTrackdir(trackdir))   SetBit(signal_dir, 0);
01137   if (signals & SignalAgainstTrackdir(trackdir)) SetBit(signal_dir, 1);
01138 
01139   /* signal_ctr         - amount of tiles already processed
01140    * signals_density    - setting to put signal on every Nth tile (double space on |, -- tracks)
01141    **********
01142    * trackdir   - trackdir to build with autorail
01143    * semaphores - semaphores or signals
01144    * signals    - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
01145    *              and convert all others to semaphore/signal
01146    * remove     - 1 remove signals, 0 build signals */
01147   signal_ctr = 0;
01148   for (;;) {
01149     /* only build/remove signals with the specified density */
01150     if ((remove && autofill) || signal_ctr % signal_density == 0) {
01151       uint32 p1 = GB(TrackdirToTrack(trackdir), 0, 3);
01152       SB(p1, 3, 1, mode);
01153       SB(p1, 4, 1, semaphores);
01154       SB(p1, 5, 3, sigtype);
01155       if (!remove && signal_ctr == 0) SetBit(p1, 17);
01156 
01157       /* Pick the correct orientation for the track direction */
01158       signals = 0;
01159       if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
01160       if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
01161 
01162       ret = DoCommand(tile, p1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
01163 
01164       /* Be user-friendly and try placing signals as much as possible */
01165       if (ret.Succeeded()) {
01166         err = false;
01167         total_cost.AddCost(ret);
01168       }
01169     }
01170 
01171     if (autofill) {
01172       if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
01173 
01174       /* Prevent possible loops */
01175       if (tile == start_tile && trackdir == start_trackdir) break;
01176     } else {
01177       if (tile == end_tile) break;
01178 
01179       tile += ToTileIndexDiff(_trackdelta[trackdir]);
01180       signal_ctr++;
01181 
01182       /* toggle railbit for the non-diagonal tracks (|, -- tracks) */
01183       if (IsDiagonalTrackdir(trackdir)) {
01184         signal_ctr++;
01185       } else {
01186         ToggleBit(trackdir, 0);
01187       }
01188     }
01189   }
01190 
01191   return err ? CMD_ERROR : total_cost;
01192 }
01193 
01211 CommandCost CmdBuildSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01212 {
01213   return CmdSignalTrackHelper(tile, flags, p1, p2, text);
01214 }
01215 
01227 CommandCost CmdRemoveSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01228 {
01229   Track track = (Track)GB(p1, 0, 3);
01230 
01231   if (!ValParamTrackOrientation(track) ||
01232       !IsPlainRailTile(tile) ||
01233       !HasTrack(tile, track) ||
01234       !EnsureNoTrainOnTrack(tile, track) ||
01235       !HasSignalOnTrack(tile, track)) {
01236     return CMD_ERROR;
01237   }
01238 
01239   /* Only water can remove signals from anyone */
01240   if (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) return CMD_ERROR;
01241 
01242   /* Do it? */
01243   if (flags & DC_EXEC) {
01244     Train *v = NULL;
01245     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
01246       v = GetTrainForReservation(tile, track);
01247     } else if (IsPbsSignal(GetSignalType(tile, track))) {
01248       /* PBS signal, might be the end of a path reservation. */
01249       Trackdir td = TrackToTrackdir(track);
01250       for (int i = 0; v == NULL && i < 2; i++, td = ReverseTrackdir(td)) {
01251         /* Only test the active signal side. */
01252         if (!HasSignalOnTrackdir(tile, ReverseTrackdir(td))) continue;
01253         TileIndex next = TileAddByDiagDir(tile, TrackdirToExitdir(td));
01254         TrackBits tracks = TrackdirBitsToTrackBits(TrackdirReachesTrackdirs(td));
01255         if (HasReservedTracks(next, tracks)) {
01256           v = GetTrainForReservation(next, TrackBitsToTrack(GetReservedTrackbits(next) & tracks));
01257         }
01258       }
01259     }
01260     SetPresentSignals(tile, GetPresentSignals(tile) & ~SignalOnTrack(track));
01261 
01262     /* removed last signal from tile? */
01263     if (GetPresentSignals(tile) == 0) {
01264       SetSignalStates(tile, 0);
01265       SetHasSignals(tile, false);
01266       SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
01267     }
01268 
01269     AddTrackToSignalBuffer(tile, track, GetTileOwner(tile));
01270     YapfNotifyTrackLayoutChange(tile, track);
01271     if (v != NULL) TryPathReserve(v, false);
01272 
01273     MarkTileDirtyByTile(tile);
01274   }
01275 
01276   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_SIGNALS]);
01277 }
01278 
01296 CommandCost CmdRemoveSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01297 {
01298   return CmdSignalTrackHelper(tile, flags, p1, SetBit(p2, 5), text); // bit 5 is remove bit
01299 }
01300 
01302 static Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
01303 {
01304   if (v->type != VEH_TRAIN) return NULL;
01305 
01306   /* Similar checks as in Train::PowerChanged() */
01307 
01308   Train *t = Train::From(v);
01309   if (t->IsArticulatedPart()) return NULL;
01310 
01311   const RailVehicleInfo *rvi = RailVehInfo(t->engine_type);
01312   if (GetVehicleProperty(t, PROP_TRAIN_POWER, rvi->power) != 0) t->First()->PowerChanged();
01313 
01314   return NULL;
01315 }
01316 
01326 CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01327 {
01328   CommandCost cost(EXPENSES_CONSTRUCTION);
01329   RailType totype = (RailType)p2;
01330 
01331   if (!ValParamRailtype(totype)) return CMD_ERROR;
01332   if (p1 >= MapSize()) return CMD_ERROR;
01333 
01334   uint ex = TileX(tile);
01335   uint ey = TileY(tile);
01336   uint sx = TileX(p1);
01337   uint sy = TileY(p1);
01338 
01339   /* make sure sx,sy are smaller than ex,ey */
01340   if (ex < sx) Swap(ex, sx);
01341   if (ey < sy) Swap(ey, sy);
01342 
01343   _error_message = STR_ERROR_NO_SUITABLE_RAILROAD_TRACK; // by default, there is no track to convert
01344 
01345   for (uint x = sx; x <= ex; ++x) {
01346     for (uint y = sy; y <= ey; ++y) {
01347       TileIndex tile = TileXY(x, y);
01348       TileType tt = GetTileType(tile);
01349 
01350       /* Check if there is any track on tile */
01351       switch (tt) {
01352         case MP_RAILWAY:
01353           break;
01354         case MP_STATION:
01355           if (!HasStationRail(tile)) continue;
01356           break;
01357         case MP_ROAD:
01358           if (!IsLevelCrossing(tile)) continue;
01359           break;
01360         case MP_TUNNELBRIDGE:
01361           if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
01362           break;
01363         default: continue;
01364       }
01365 
01366       /* Original railtype we are converting from */
01367       RailType type = GetRailType(tile);
01368 
01369       /* Converting to the same type or converting 'hidden' elrail -> rail */
01370       if (type == totype || (_settings_game.vehicle.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
01371 
01372       /* Trying to convert other's rail */
01373       if (!CheckTileOwnership(tile)) continue;
01374 
01375       SmallVector<Train *, 2> vehicles_affected;
01376 
01377       /* Vehicle on the tile when not converting Rail <-> ElRail
01378        * Tunnels and bridges have special check later */
01379       if (tt != MP_TUNNELBRIDGE) {
01380         if (!IsCompatibleRail(type, totype) && !EnsureNoVehicleOnGround(tile)) continue;
01381         if (flags & DC_EXEC) { // we can safely convert, too
01382           TrackBits reserved = GetReservedTrackbits(tile);
01383           Track     track;
01384           while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
01385             Train *v = GetTrainForReservation(tile, track);
01386             if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
01387               /* No power on new rail type, reroute. */
01388               FreeTrainTrackReservation(v);
01389               *vehicles_affected.Append() = v;
01390             }
01391           }
01392 
01393           SetRailType(tile, totype);
01394           MarkTileDirtyByTile(tile);
01395           /* update power of train engines on this tile */
01396           FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
01397         }
01398       }
01399 
01400       switch (tt) {
01401         case MP_RAILWAY:
01402           switch (GetRailTileType(tile)) {
01403             case RAIL_TILE_DEPOT:
01404               if (flags & DC_EXEC) {
01405                 /* notify YAPF about the track layout change */
01406                 YapfNotifyTrackLayoutChange(tile, GetRailDepotTrack(tile));
01407 
01408                 /* Update build vehicle window related to this depot */
01409                 InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
01410                 InvalidateWindowData(WC_BUILD_VEHICLE, tile);
01411               }
01412               cost.AddCost(RailConvertCost(type, totype));
01413               break;
01414 
01415             default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
01416               if (flags & DC_EXEC) {
01417                 /* notify YAPF about the track layout change */
01418                 TrackBits tracks = GetTrackBits(tile);
01419                 while (tracks != TRACK_BIT_NONE) {
01420                   YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
01421                 }
01422               }
01423               cost.AddCost(RailConvertCost(type, totype) * CountBits(GetTrackBits(tile)));
01424               break;
01425           }
01426           break;
01427 
01428         case MP_TUNNELBRIDGE: {
01429           TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
01430 
01431           /* If both ends of tunnel/bridge are in the range, do not try to convert twice -
01432            * it would cause assert because of different test and exec runs */
01433           if (endtile < tile && TileX(endtile) >= sx && TileX(endtile) <= ex &&
01434               TileY(endtile) >= sy && TileY(endtile) <= ey) continue;
01435 
01436           /* When not coverting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
01437           if (!IsCompatibleRail(GetRailType(tile), totype) &&
01438               HasVehicleOnTunnelBridge(tile, endtile)) continue;
01439 
01440           if (flags & DC_EXEC) {
01441             Track track = DiagDirToDiagTrack(GetTunnelBridgeDirection(tile));
01442             if (HasTunnelBridgeReservation(tile)) {
01443               Train *v = GetTrainForReservation(tile, track);
01444               if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
01445                 /* No power on new rail type, reroute. */
01446                 FreeTrainTrackReservation(v);
01447                 *vehicles_affected.Append() = v;
01448               }
01449             }
01450             SetRailType(tile, totype);
01451             SetRailType(endtile, totype);
01452 
01453             FindVehicleOnPos(tile, NULL, &UpdateTrainPowerProc);
01454             FindVehicleOnPos(endtile, NULL, &UpdateTrainPowerProc);
01455 
01456             YapfNotifyTrackLayoutChange(tile, track);
01457             YapfNotifyTrackLayoutChange(endtile, track);
01458 
01459             MarkTileDirtyByTile(tile);
01460             MarkTileDirtyByTile(endtile);
01461 
01462             if (IsBridge(tile)) {
01463               TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
01464               TileIndex t = tile + delta;
01465               for (; t != endtile; t += delta) MarkTileDirtyByTile(t); // TODO encapsulate this into a function
01466             }
01467           }
01468 
01469           cost.AddCost((GetTunnelBridgeLength(tile, endtile) + 2) * RailConvertCost(type, totype));
01470         } break;
01471 
01472         default: // MP_STATION, MP_ROAD
01473           if (flags & DC_EXEC) {
01474             Track track = ((tt == MP_STATION) ? GetRailStationTrack(tile) : GetCrossingRailTrack(tile));
01475             YapfNotifyTrackLayoutChange(tile, track);
01476           }
01477 
01478           cost.AddCost(RailConvertCost(type, totype));
01479           break;
01480       }
01481 
01482       for (uint i = 0; i < vehicles_affected.Length(); ++i) {
01483         TryPathReserve(vehicles_affected[i], true);
01484       }
01485     }
01486   }
01487 
01488   return (cost.GetCost() == 0) ? CMD_ERROR : cost;
01489 }
01490 
01491 static CommandCost RemoveTrainDepot(TileIndex tile, DoCommandFlag flags)
01492 {
01493   if (!CheckTileOwnership(tile) && _current_company != OWNER_WATER)
01494     return CMD_ERROR;
01495 
01496   if (!EnsureNoVehicleOnGround(tile))
01497     return CMD_ERROR;
01498 
01499   if (flags & DC_EXEC) {
01500     /* read variables before the depot is removed */
01501     DiagDirection dir = GetRailDepotDirection(tile);
01502     Owner owner = GetTileOwner(tile);
01503     Train *v = NULL;
01504 
01505     if (HasDepotReservation(tile)) {
01506       v = GetTrainForReservation(tile, DiagDirToDiagTrack(dir));
01507       if (v != NULL) FreeTrainTrackReservation(v);
01508     }
01509 
01510     delete Depot::GetByTile(tile);
01511     DoClearSquare(tile);
01512     AddSideToSignalBuffer(tile, dir, owner);
01513     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
01514     if (v != NULL) TryPathReserve(v, true);
01515   }
01516 
01517   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_TRAIN]);
01518 }
01519 
01520 static CommandCost ClearTile_Track(TileIndex tile, DoCommandFlag flags)
01521 {
01522   CommandCost cost(EXPENSES_CONSTRUCTION);
01523   CommandCost ret;
01524 
01525   if (flags & DC_AUTO) {
01526     if (!IsTileOwner(tile, _current_company)) {
01527       return_cmd_error(STR_ERROR_AREA_IS_OWNED_BY_ANOTHER);
01528     }
01529 
01530     if (IsPlainRail(tile)) {
01531       return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
01532     } else {
01533       return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
01534     }
01535   }
01536 
01537   switch (GetRailTileType(tile)) {
01538     case RAIL_TILE_SIGNALS:
01539     case RAIL_TILE_NORMAL: {
01540       Slope tileh = GetTileSlope(tile, NULL);
01541       /* Is there flat water on the lower halftile, that gets cleared expensively? */
01542       bool water_ground = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh));
01543 
01544       TrackBits tracks = GetTrackBits(tile);
01545       while (tracks != TRACK_BIT_NONE) {
01546         Track track = RemoveFirstTrack(&tracks);
01547         ret = DoCommand(tile, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
01548         if (ret.Failed()) return CMD_ERROR;
01549         cost.AddCost(ret);
01550       }
01551 
01552       /* when bankrupting, don't make water dirty, there could be a ship on lower halftile */
01553       if (water_ground && !(flags & DC_BANKRUPT)) {
01554         if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
01555 
01556         /* The track was removed, and left a coast tile. Now also clear the water. */
01557         if (flags & DC_EXEC) DoClearSquare(tile);
01558         cost.AddCost(_price[PR_CLEAR_WATER]);
01559       }
01560 
01561       return cost;
01562     }
01563 
01564     case RAIL_TILE_DEPOT:
01565       return RemoveTrainDepot(tile, flags);
01566 
01567     default:
01568       return CMD_ERROR;
01569   }
01570 }
01571 
01576 static uint GetSaveSlopeZ(uint x, uint y, Track track)
01577 {
01578   switch (track) {
01579     case TRACK_UPPER: x &= ~0xF; y &= ~0xF; break;
01580     case TRACK_LOWER: x |=  0xF; y |=  0xF; break;
01581     case TRACK_LEFT:  x |=  0xF; y &= ~0xF; break;
01582     case TRACK_RIGHT: x &= ~0xF; y |=  0xF; break;
01583     default: break;
01584   }
01585   return GetSlopeZ(x, y);
01586 }
01587 
01588 static void DrawSingleSignal(TileIndex tile, Track track, byte condition, uint image, uint pos)
01589 {
01590   bool side = (_settings_game.vehicle.road_side != 0) && _settings_game.construction.signal_side;
01591   static const Point SignalPositions[2][12] = {
01592     { // Signals on the left side
01593     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
01594       { 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
01595     /*  LOWER     LOWER     X         X         Y         Y     */
01596       {11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
01597     }, { // Signals on the right side
01598     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
01599       {14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
01600     /*  LOWER     LOWER     X         X         Y         Y     */
01601       {14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
01602     }
01603   };
01604 
01605   uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
01606   uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
01607 
01608   SpriteID sprite;
01609 
01610   SignalType type       = GetSignalType(tile, track);
01611   SignalVariant variant = GetSignalVariant(tile, track);
01612 
01613   if (type == SIGTYPE_NORMAL && variant == SIG_ELECTRIC) {
01614     /* Normal electric signals are picked from original sprites. */
01615     sprite = SPR_ORIGINAL_SIGNALS_BASE + image + condition;
01616   } else {
01617     /* All other signals are picked from add on sprites. */
01618     sprite = SPR_SIGNALS_BASE + (type - 1) * 16 + variant * 64 + image + condition + (type > SIGTYPE_LAST_NOPBS ? 64 : 0);
01619   }
01620 
01621   AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, GetSaveSlopeZ(x, y, track));
01622 }
01623 
01624 static uint32 _drawtile_track_palette;
01625 
01626 
01627 static void DrawTrackFence_NW(const TileInfo *ti, SpriteID base_image)
01628 {
01629   RailFenceOffset rfo = RFO_FLAT_X;
01630   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
01631   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01632     ti->x, ti->y + 1, 16, 1, 4, ti->z);
01633 }
01634 
01635 static void DrawTrackFence_SE(const TileInfo *ti, SpriteID base_image)
01636 {
01637   RailFenceOffset rfo = RFO_FLAT_X;
01638   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
01639   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01640     ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
01641 }
01642 
01643 static void DrawTrackFence_NW_SE(const TileInfo *ti, SpriteID base_image)
01644 {
01645   DrawTrackFence_NW(ti, base_image);
01646   DrawTrackFence_SE(ti, base_image);
01647 }
01648 
01649 static void DrawTrackFence_NE(const TileInfo *ti, SpriteID base_image)
01650 {
01651   RailFenceOffset rfo = RFO_FLAT_Y;
01652   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
01653   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01654     ti->x + 1, ti->y, 1, 16, 4, ti->z);
01655 }
01656 
01657 static void DrawTrackFence_SW(const TileInfo *ti, SpriteID base_image)
01658 {
01659   RailFenceOffset rfo = RFO_FLAT_Y;
01660   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
01661   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
01662     ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
01663 }
01664 
01665 static void DrawTrackFence_NE_SW(const TileInfo *ti, SpriteID base_image)
01666 {
01667   DrawTrackFence_NE(ti, base_image);
01668   DrawTrackFence_SW(ti, base_image);
01669 }
01670 
01674 static void DrawTrackFence_NS_1(const TileInfo *ti, SpriteID base_image)
01675 {
01676   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_W);
01677   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
01678     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01679 }
01680 
01684 static void DrawTrackFence_NS_2(const TileInfo *ti, SpriteID base_image)
01685 {
01686   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_E);
01687   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
01688     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01689 }
01690 
01694 static void DrawTrackFence_WE_1(const TileInfo *ti, SpriteID base_image)
01695 {
01696   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_N);
01697   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
01698     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01699 }
01700 
01704 static void DrawTrackFence_WE_2(const TileInfo *ti, SpriteID base_image)
01705 {
01706   uint z = ti->z + GetSlopeZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_S);
01707   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
01708     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
01709 }
01710 
01711 
01712 static void DrawTrackDetails(const TileInfo *ti)
01713 {
01714   /* Base sprite for track fences. */
01715   SpriteID base_image = SPR_TRACK_FENCE_FLAT_X;
01716 
01717   switch (GetRailGroundType(ti->tile)) {
01718     case RAIL_GROUND_FENCE_NW:     DrawTrackFence_NW(ti, base_image);    break;
01719     case RAIL_GROUND_FENCE_SE:     DrawTrackFence_SE(ti, base_image);    break;
01720     case RAIL_GROUND_FENCE_SENW:   DrawTrackFence_NW_SE(ti, base_image); break;
01721     case RAIL_GROUND_FENCE_NE:     DrawTrackFence_NE(ti, base_image);    break;
01722     case RAIL_GROUND_FENCE_SW:     DrawTrackFence_SW(ti, base_image);    break;
01723     case RAIL_GROUND_FENCE_NESW:   DrawTrackFence_NE_SW(ti, base_image); break;
01724     case RAIL_GROUND_FENCE_VERT1:  DrawTrackFence_NS_1(ti, base_image);  break;
01725     case RAIL_GROUND_FENCE_VERT2:  DrawTrackFence_NS_2(ti, base_image);  break;
01726     case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti, base_image);  break;
01727     case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti, base_image);  break;
01728     case RAIL_GROUND_WATER: {
01729       Corner track_corner;
01730       if (IsHalftileSlope(ti->tileh)) {
01731         /* Steep slope or one-corner-raised slope with halftile foundation */
01732         track_corner = GetHalftileSlopeCorner(ti->tileh);
01733       } else {
01734         /* Three-corner-raised slope */
01735         track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
01736       }
01737       switch (track_corner) {
01738         case CORNER_W: DrawTrackFence_NS_1(ti, base_image); break;
01739         case CORNER_S: DrawTrackFence_WE_2(ti, base_image); break;
01740         case CORNER_E: DrawTrackFence_NS_2(ti, base_image); break;
01741         case CORNER_N: DrawTrackFence_WE_1(ti, base_image); break;
01742         default: NOT_REACHED();
01743       }
01744       break;
01745     }
01746     default: break;
01747   }
01748 }
01749 
01750 
01756 static void DrawTrackBits(TileInfo *ti, TrackBits track)
01757 {
01758   /* SubSprite for drawing the track halftile of 'three-corners-raised'-sloped rail sprites. */
01759   static const int INF = 1000; // big number compared to tilesprite size
01760   static const SubSprite _halftile_sub_sprite[4] = {
01761     { -INF    , -INF  , 32 - 33, INF     }, // CORNER_W, clip 33 pixels from right
01762     { -INF    ,  0 + 7, INF    , INF     }, // CORNER_S, clip 7 pixels from top
01763     { -31 + 33, -INF  , INF    , INF     }, // CORNER_E, clip 33 pixels from left
01764     { -INF    , -INF  , INF    , 30 - 23 }  // CORNER_N, clip 23 pixels from bottom
01765   };
01766 
01767   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
01768   RailGroundType rgt = GetRailGroundType(ti->tile);
01769   Foundation f = GetRailFoundation(ti->tileh, track);
01770   Corner halftile_corner = CORNER_INVALID;
01771 
01772   if (IsNonContinuousFoundation(f)) {
01773     /* Save halftile corner */
01774     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
01775     /* Draw lower part first */
01776     track &= ~CornerToTrackBits(halftile_corner);
01777     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
01778   }
01779 
01780   DrawFoundation(ti, f);
01781   /* DrawFoundation modifies ti */
01782 
01783   SpriteID image;
01784   PaletteID pal = PAL_NONE;
01785   const SubSprite *sub = NULL;
01786   bool junction = false;
01787 
01788   /* Select the sprite to use. */
01789   if (track == 0) {
01790     /* Clear ground (only track on halftile foundation) */
01791     if (rgt == RAIL_GROUND_WATER) {
01792       if (IsSteepSlope(ti->tileh)) {
01793         DrawShoreTile(ti->tileh);
01794         image = 0;
01795       } else {
01796         image = SPR_FLAT_WATER_TILE;
01797       }
01798     } else {
01799       switch (rgt) {
01800         case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
01801         case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
01802         default:                     image = SPR_FLAT_GRASS_TILE; break;
01803       }
01804       image += _tileh_to_sprite[ti->tileh];
01805     }
01806   } else {
01807     if (ti->tileh != SLOPE_FLAT) {
01808       /* track on non-flat ground */
01809       image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
01810     } else {
01811       /* track on flat ground */
01812       (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
01813       (image++,                           track == TRACK_BIT_X) ||
01814       (image++,                           track == TRACK_BIT_UPPER) ||
01815       (image++,                           track == TRACK_BIT_LOWER) ||
01816       (image++,                           track == TRACK_BIT_RIGHT) ||
01817       (image++,                           track == TRACK_BIT_LEFT) ||
01818       (image++,                           track == TRACK_BIT_CROSS) ||
01819 
01820       (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
01821       (image++,                            track == TRACK_BIT_VERT) ||
01822 
01823       (junction = true, false) ||
01824       (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
01825       (image++,                          (track & TRACK_BIT_3WAY_SW) == 0) ||
01826       (image++,                          (track & TRACK_BIT_3WAY_NW) == 0) ||
01827       (image++,                          (track & TRACK_BIT_3WAY_SE) == 0) ||
01828       (image++, true);
01829     }
01830 
01831     switch (rgt) {
01832       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
01833       case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset;  break;
01834       case RAIL_GROUND_WATER: {
01835         /* three-corner-raised slope */
01836         DrawShoreTile(ti->tileh);
01837         Corner track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
01838         sub = &(_halftile_sub_sprite[track_corner]);
01839         break;
01840       }
01841       default: break;
01842     }
01843   }
01844 
01845   if (image != 0) DrawGroundSprite(image, pal, sub);
01846 
01847   /* Draw track pieces individually for junction tiles */
01848   if (junction) {
01849     if (track & TRACK_BIT_X)     DrawGroundSprite(rti->base_sprites.single_x, PAL_NONE);
01850     if (track & TRACK_BIT_Y)     DrawGroundSprite(rti->base_sprites.single_y, PAL_NONE);
01851     if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PAL_NONE);
01852     if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PAL_NONE);
01853     if (track & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PAL_NONE);
01854     if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PAL_NONE);
01855   }
01856 
01857   /* PBS debugging, draw reserved tracks darker */
01858   if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation) {
01859     /* Get reservation, but mask track on halftile slope */
01860     TrackBits pbs = GetRailReservationTrackBits(ti->tile) & track;
01861     if (pbs & TRACK_BIT_X) {
01862       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
01863         DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH);
01864       } else {
01865         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
01866       }
01867     }
01868     if (pbs & TRACK_BIT_Y) {
01869       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
01870         DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH);
01871       } else {
01872         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
01873       }
01874     }
01875     if (pbs & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_N ? -TILE_HEIGHT : 0);
01876     if (pbs & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_S ? -TILE_HEIGHT : 0);
01877     if (pbs & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_W ? -TILE_HEIGHT : 0);
01878     if (pbs & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_E ? -TILE_HEIGHT : 0);
01879   }
01880 
01881   if (IsValidCorner(halftile_corner)) {
01882     DrawFoundation(ti, HalftileFoundation(halftile_corner));
01883 
01884     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
01885     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
01886     image = _track_sloped_sprites[fake_slope - 1] + rti->base_sprites.track_y;
01887     pal = PAL_NONE;
01888     switch (rgt) {
01889       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
01890       case RAIL_GROUND_ICE_DESERT:
01891       case RAIL_GROUND_HALF_SNOW:  image += rti->snow_offset;  break; // higher part has snow in this case too
01892       default: break;
01893     }
01894     DrawGroundSprite(image, pal, &(_halftile_sub_sprite[halftile_corner]));
01895 
01896     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, CornerToTrackBits(halftile_corner))) {
01897       static const byte _corner_to_track_sprite[] = {3, 1, 2, 0};
01898       DrawGroundSprite(_corner_to_track_sprite[halftile_corner] + rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, -TILE_HEIGHT);
01899     }
01900   }
01901 }
01902 
01908 enum {
01909   SIGNAL_TO_SOUTHWEST =  0,
01910   SIGNAL_TO_NORTHEAST =  2,
01911   SIGNAL_TO_SOUTHEAST =  4,
01912   SIGNAL_TO_NORTHWEST =  6,
01913   SIGNAL_TO_EAST      =  8,
01914   SIGNAL_TO_WEST      = 10,
01915   SIGNAL_TO_SOUTH     = 12,
01916   SIGNAL_TO_NORTH     = 14,
01917 };
01918 
01919 static void DrawSignals(TileIndex tile, TrackBits rails)
01920 {
01921 #define MAYBE_DRAW_SIGNAL(x, y, z, t) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, t, GetSingleSignalState(tile, x), y, z)
01922 
01923   if (!(rails & TRACK_BIT_Y)) {
01924     if (!(rails & TRACK_BIT_X)) {
01925       if (rails & TRACK_BIT_LEFT) {
01926         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTH, 0, TRACK_LEFT);
01927         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTH, 1, TRACK_LEFT);
01928       }
01929       if (rails & TRACK_BIT_RIGHT) {
01930         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_NORTH, 2, TRACK_RIGHT);
01931         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_SOUTH, 3, TRACK_RIGHT);
01932       }
01933       if (rails & TRACK_BIT_UPPER) {
01934         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_WEST, 4, TRACK_UPPER);
01935         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_EAST, 5, TRACK_UPPER);
01936       }
01937       if (rails & TRACK_BIT_LOWER) {
01938         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_WEST, 6, TRACK_LOWER);
01939         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_EAST, 7, TRACK_LOWER);
01940       }
01941     } else {
01942       MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHWEST, 8, TRACK_X);
01943       MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHEAST, 9, TRACK_X);
01944     }
01945   } else {
01946     MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHEAST, 10, TRACK_Y);
01947     MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHWEST, 11, TRACK_Y);
01948   }
01949 }
01950 
01951 static void DrawTile_Track(TileInfo *ti)
01952 {
01953   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
01954   SpriteID image;
01955 
01956   _drawtile_track_palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
01957 
01958   if (IsPlainRail(ti->tile)) {
01959     TrackBits rails = GetTrackBits(ti->tile);
01960 
01961     DrawTrackBits(ti, rails);
01962 
01963     if (HasBit(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti);
01964 
01965     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
01966 
01967     if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
01968   } else {
01969     /* draw depot */
01970     const DrawTileSprites *dts;
01971     PaletteID pal = PAL_NONE;
01972 
01973     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
01974 
01975     if (IsInvisibilitySet(TO_BUILDINGS)) {
01976       /* Draw rail instead of depot */
01977       dts = &_depot_invisible_gfx_table[GetRailDepotDirection(ti->tile)];
01978     } else {
01979       dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
01980     }
01981 
01982     image = dts->ground.sprite;
01983     if (image != SPR_FLAT_GRASS_TILE) image += rti->total_offset;
01984 
01985     /* adjust ground tile for desert
01986      * don't adjust for snow, because snow in depots looks weird */
01987     if (IsSnowRailGround(ti->tile) && _settings_game.game_creation.landscape == LT_TROPIC) {
01988       if (image != SPR_FLAT_GRASS_TILE) {
01989         image += rti->snow_offset; // tile with tracks
01990       } else {
01991         image = SPR_FLAT_SNOW_DESERT_TILE; // flat ground
01992       }
01993     }
01994 
01995     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, _drawtile_track_palette));
01996 
01997     /* PBS debugging, draw reserved tracks darker */
01998     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
01999       switch (GetRailDepotDirection(ti->tile)) {
02000         case DIAGDIR_SW: DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH); break;
02001         case DIAGDIR_SE: DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH); break;
02002         default: break;
02003       }
02004     }
02005 
02006     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
02007 
02008     /* No NewGRF depots, so no relocation */
02009     DrawRailTileSeq(ti, dts, TO_BUILDINGS, rti->total_offset, 0, _drawtile_track_palette);
02010   }
02011   DrawBridgeMiddle(ti);
02012 }
02013 
02014 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
02015 {
02016   const DrawTileSprites *dts = &_depot_gfx_table[dir];
02017   SpriteID image = dts->ground.sprite;
02018   uint32 offset = GetRailTypeInfo(railtype)->total_offset;
02019 
02020   x += 33;
02021   y += 17;
02022 
02023   if (image != SPR_FLAT_GRASS_TILE) image += offset;
02024   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
02025 
02026   DrawSprite(image, PAL_NONE, x, y);
02027   DrawRailTileSeqInGUI(x, y, dts, offset, 0, palette);
02028 }
02029 
02030 static uint GetSlopeZ_Track(TileIndex tile, uint x, uint y)
02031 {
02032   uint z;
02033   Slope tileh = GetTileSlope(tile, &z);
02034 
02035   if (tileh == SLOPE_FLAT) return z;
02036   if (IsPlainRail(tile)) {
02037     z += ApplyFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
02038     return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
02039   } else {
02040     return z + TILE_HEIGHT;
02041   }
02042 }
02043 
02044 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
02045 {
02046   return IsPlainRail(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
02047 }
02048 
02049 static void TileLoop_Track(TileIndex tile)
02050 {
02051   RailGroundType old_ground = GetRailGroundType(tile);
02052   RailGroundType new_ground;
02053 
02054   if (old_ground == RAIL_GROUND_WATER) {
02055     TileLoop_Water(tile);
02056     return;
02057   }
02058 
02059   switch (_settings_game.game_creation.landscape) {
02060     case LT_ARCTIC: {
02061       uint z;
02062       Slope slope = GetTileSlope(tile, &z);
02063       bool half = false;
02064 
02065       /* for non-flat track, use lower part of track
02066        * in other cases, use the highest part with track */
02067       if (IsPlainRail(tile)) {
02068         TrackBits track = GetTrackBits(tile);
02069         Foundation f = GetRailFoundation(slope, track);
02070 
02071         switch (f) {
02072           case FOUNDATION_NONE:
02073             /* no foundation - is the track on the upper side of three corners raised tile? */
02074             if (IsSlopeWithThreeCornersRaised(slope)) z += TILE_HEIGHT;
02075             break;
02076 
02077           case FOUNDATION_INCLINED_X:
02078           case FOUNDATION_INCLINED_Y:
02079             /* sloped track - is it on a steep slope? */
02080             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
02081             break;
02082 
02083           case FOUNDATION_STEEP_LOWER:
02084             /* only lower part of steep slope */
02085             z += TILE_HEIGHT;
02086             break;
02087 
02088           default:
02089             /* if it is a steep slope, then there is a track on higher part */
02090             if (IsSteepSlope(slope)) z += TILE_HEIGHT;
02091             z += TILE_HEIGHT;
02092             break;
02093         }
02094 
02095         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
02096       } else {
02097         /* is the depot on a non-flat tile? */
02098         if (slope != SLOPE_FLAT) z += TILE_HEIGHT;
02099       }
02100 
02101       /* 'z' is now the lowest part of the highest track bit -
02102        * for sloped track, it is 'z' of lower part
02103        * for two track bits, it is 'z' of higher track bit
02104        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
02105       if (z > GetSnowLine()) {
02106         if (half && z - GetSnowLine() == TILE_HEIGHT) {
02107           /* track on non-continuous foundation, lower part is not under snow */
02108           new_ground = RAIL_GROUND_HALF_SNOW;
02109         } else {
02110           new_ground = RAIL_GROUND_ICE_DESERT;
02111         }
02112         goto set_ground;
02113       }
02114       break;
02115       }
02116 
02117     case LT_TROPIC:
02118       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
02119         new_ground = RAIL_GROUND_ICE_DESERT;
02120         goto set_ground;
02121       }
02122       break;
02123   }
02124 
02125   if (!IsPlainRail(tile)) return;
02126 
02127   new_ground = RAIL_GROUND_GRASS;
02128 
02129   if (old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
02130     /* determine direction of fence */
02131     TrackBits rail = GetTrackBits(tile);
02132 
02133     switch (rail) {
02134       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
02135       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
02136       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
02137       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
02138 
02139       default: {
02140         Owner owner = GetTileOwner(tile);
02141 
02142         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
02143               (rail & TRACK_BIT_3WAY_NW) == 0 &&
02144               (rail & TRACK_BIT_X)
02145             )) {
02146           TileIndex n = tile + TileDiffXY(0, -1);
02147           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02148 
02149           if (!IsTileType(n, MP_RAILWAY) ||
02150               !IsTileOwner(n, owner) ||
02151               nrail == TRACK_BIT_UPPER ||
02152               nrail == TRACK_BIT_LEFT) {
02153             new_ground = RAIL_GROUND_FENCE_NW;
02154           }
02155         }
02156 
02157         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
02158               (rail & TRACK_BIT_3WAY_SE) == 0 &&
02159               (rail & TRACK_BIT_X)
02160             )) {
02161           TileIndex n = tile + TileDiffXY(0, 1);
02162           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02163 
02164           if (!IsTileType(n, MP_RAILWAY) ||
02165               !IsTileOwner(n, owner) ||
02166               nrail == TRACK_BIT_LOWER ||
02167               nrail == TRACK_BIT_RIGHT) {
02168             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
02169               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
02170           }
02171         }
02172 
02173         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
02174               (rail & TRACK_BIT_3WAY_NE) == 0 &&
02175               (rail & TRACK_BIT_Y)
02176             )) {
02177           TileIndex n = tile + TileDiffXY(-1, 0);
02178           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02179 
02180           if (!IsTileType(n, MP_RAILWAY) ||
02181               !IsTileOwner(n, owner) ||
02182               nrail == TRACK_BIT_UPPER ||
02183               nrail == TRACK_BIT_RIGHT) {
02184             new_ground = RAIL_GROUND_FENCE_NE;
02185           }
02186         }
02187 
02188         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
02189               (rail & TRACK_BIT_3WAY_SW) == 0 &&
02190               (rail & TRACK_BIT_Y)
02191             )) {
02192           TileIndex n = tile + TileDiffXY(1, 0);
02193           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
02194 
02195           if (!IsTileType(n, MP_RAILWAY) ||
02196               !IsTileOwner(n, owner) ||
02197               nrail == TRACK_BIT_LOWER ||
02198               nrail == TRACK_BIT_LEFT) {
02199             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
02200               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
02201           }
02202         }
02203         break;
02204       }
02205     }
02206   }
02207 
02208 set_ground:
02209   if (old_ground != new_ground) {
02210     SetRailGroundType(tile, new_ground);
02211     MarkTileDirtyByTile(tile);
02212   }
02213 }
02214 
02215 
02216 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
02217 {
02218   /* Case of half tile slope with water. */
02219   if (mode == TRANSPORT_WATER && IsPlainRail(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
02220     TrackBits tb = GetTrackBits(tile);
02221     switch (tb) {
02222       default: NOT_REACHED();
02223       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
02224       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
02225       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
02226       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
02227     }
02228     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
02229   }
02230 
02231   if (mode != TRANSPORT_RAIL) return 0;
02232 
02233   TrackBits trackbits = TRACK_BIT_NONE;
02234   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
02235 
02236   switch (GetRailTileType(tile)) {
02237     default: NOT_REACHED();
02238     case RAIL_TILE_NORMAL:
02239       trackbits = GetTrackBits(tile);
02240       break;
02241 
02242     case RAIL_TILE_SIGNALS: {
02243       trackbits = GetTrackBits(tile);
02244       byte a = GetPresentSignals(tile);
02245       uint b = GetSignalStates(tile);
02246 
02247       b &= a;
02248 
02249       /* When signals are not present (in neither direction),
02250        * we pretend them to be green. Otherwise, it depends on
02251        * the signal type. For signals that are only active from
02252        * one side, we set the missing signals explicitely to
02253        * `green'. Otherwise, they implicitely become `red'. */
02254       if (!IsOnewaySignal(tile, TRACK_UPPER) || (a & SignalOnTrack(TRACK_UPPER)) == 0) b |= ~a & SignalOnTrack(TRACK_UPPER);
02255       if (!IsOnewaySignal(tile, TRACK_LOWER) || (a & SignalOnTrack(TRACK_LOWER)) == 0) b |= ~a & SignalOnTrack(TRACK_LOWER);
02256 
02257       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
02258       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
02259       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
02260       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
02261 
02262       break;
02263     }
02264 
02265     case RAIL_TILE_DEPOT: {
02266       DiagDirection dir = GetRailDepotDirection(tile);
02267 
02268       if (side != INVALID_DIAGDIR && side != dir) break;
02269 
02270       trackbits = DiagDirToDiagTrackBits(dir);
02271       break;
02272     }
02273   }
02274 
02275   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
02276 }
02277 
02278 static bool ClickTile_Track(TileIndex tile)
02279 {
02280   if (!IsRailDepot(tile)) return false;
02281 
02282   ShowDepotWindow(tile, VEH_TRAIN);
02283   return true;
02284 }
02285 
02286 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
02287 {
02288   td->owner[0] = GetTileOwner(tile);
02289   switch (GetRailTileType(tile)) {
02290     case RAIL_TILE_NORMAL:
02291       td->str = STR_LAI_RAIL_DESCRIPTION_TRACK;
02292       break;
02293 
02294     case RAIL_TILE_SIGNALS: {
02295       static const StringID signal_type[6][6] = {
02296         {
02297           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_SIGNALS,
02298           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
02299           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
02300           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
02301           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
02302           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS
02303         },
02304         {
02305           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
02306           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRESIGNALS,
02307           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
02308           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
02309           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
02310           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS
02311         },
02312         {
02313           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
02314           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
02315           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXITSIGNALS,
02316           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
02317           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
02318           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS
02319         },
02320         {
02321           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
02322           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
02323           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
02324           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBOSIGNALS,
02325           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
02326           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS
02327         },
02328         {
02329           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
02330           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
02331           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
02332           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
02333           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBSSIGNALS,
02334           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS
02335         },
02336         {
02337           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS,
02338           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS,
02339           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS,
02340           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS,
02341           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS,
02342           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NOENTRYSIGNALS
02343         }
02344       };
02345 
02346       SignalType primary_signal;
02347       SignalType secondary_signal;
02348       if (HasSignalOnTrack(tile, TRACK_UPPER)) {
02349         primary_signal = GetSignalType(tile, TRACK_UPPER);
02350         secondary_signal = HasSignalOnTrack(tile, TRACK_LOWER) ? GetSignalType(tile, TRACK_LOWER) : primary_signal;
02351       } else {
02352         secondary_signal = primary_signal = GetSignalType(tile, TRACK_LOWER);
02353       }
02354 
02355       td->str = signal_type[secondary_signal][primary_signal];
02356       break;
02357     }
02358 
02359     case RAIL_TILE_DEPOT:
02360       td->str = STR_LAI_RAIL_DESCRIPTION_TRAIN_DEPOT;
02361       break;
02362 
02363     default:
02364       NOT_REACHED();
02365   }
02366 }
02367 
02368 static void ChangeTileOwner_Track(TileIndex tile, Owner old_owner, Owner new_owner)
02369 {
02370   if (!IsTileOwner(tile, old_owner)) return;
02371 
02372   if (new_owner != INVALID_OWNER) {
02373     SetTileOwner(tile, new_owner);
02374   } else {
02375     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
02376   }
02377 }
02378 
02379 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
02380 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
02381 static const int8 _deltacoord_leaveoffset[8] = {
02382   -1,  0,  1,  0, /* x */
02383    0,  1,  0, -1  /* y */
02384 };
02385 
02386 
02392 int TicksToLeaveDepot(const Train *v)
02393 {
02394   DiagDirection dir = GetRailDepotDirection(v->tile);
02395   int length = v->tcache.cached_veh_length;
02396 
02397   switch (dir) {
02398     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
02399     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
02400     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
02401     default:
02402     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
02403   }
02404 
02405   return 0; // make compilers happy
02406 }
02407 
02410 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *u, TileIndex tile, int x, int y)
02411 {
02412   byte fract_coord;
02413   byte fract_coord_leave;
02414   DiagDirection dir;
02415   int length;
02416 
02417   /* this routine applies only to trains in depot tiles */
02418   if (u->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
02419 
02420   Train *v = Train::From(u);
02421 
02422   /* depot direction */
02423   dir = GetRailDepotDirection(tile);
02424 
02425   /* calculate the point where the following wagon should be activated
02426    * this depends on the length of the current vehicle */
02427   length = v->tcache.cached_veh_length;
02428 
02429   fract_coord_leave =
02430     ((_fractcoords_enter[dir] & 0x0F) + // x
02431       (length + 1) * _deltacoord_leaveoffset[dir]) +
02432     (((_fractcoords_enter[dir] >> 4) +  // y
02433       ((length + 1) * _deltacoord_leaveoffset[dir + 4])) << 4);
02434 
02435   fract_coord = (x & 0xF) + ((y & 0xF) << 4);
02436 
02437   if (_fractcoords_behind[dir] == fract_coord) {
02438     /* make sure a train is not entering the tile from behind */
02439     return VETSB_CANNOT_ENTER;
02440   } else if (_fractcoords_enter[dir] == fract_coord) {
02441     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
02442       /* enter the depot */
02443       v->track = TRACK_BIT_DEPOT,
02444       v->vehstatus |= VS_HIDDEN; // hide it
02445       v->direction = ReverseDir(v->direction);
02446       if (v->Next() == NULL) VehicleEnterDepot(v->First());
02447       v->tile = tile;
02448 
02449       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
02450       return VETSB_ENTERED_WORMHOLE;
02451     }
02452   } else if (fract_coord_leave == fract_coord) {
02453     if (DiagDirToDir(dir) == v->direction) {
02454       /* leave the depot? */
02455       if ((v = v->Next()) != NULL) {
02456         v->vehstatus &= ~VS_HIDDEN;
02457         v->track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
02458       }
02459     }
02460   }
02461 
02462   return VETSB_CONTINUE;
02463 }
02464 
02476 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, uint z_old, Slope tileh_old, uint z_new, Slope tileh_new, TrackBits rail_bits)
02477 {
02478   if (!_settings_game.construction.build_on_slopes || !AutoslopeEnabled()) return CMD_ERROR;
02479 
02480   /* Is the slope-rail_bits combination valid in general? I.e. is it safe to call GetRailFoundation() ? */
02481   if (CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile).Failed()) return CMD_ERROR;
02482 
02483   /* Get the slopes on top of the foundations */
02484   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
02485   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
02486 
02487   Corner track_corner;
02488   switch (rail_bits) {
02489     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
02490     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
02491     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
02492     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
02493 
02494     /* Surface slope must not be changed */
02495     default: return (((z_old != z_new) || (tileh_old != tileh_new)) ? CMD_ERROR : CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]));
02496   }
02497 
02498   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
02499   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
02500   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
02501   if (z_old != z_new) return CMD_ERROR;
02502 
02503   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
02504   /* Make the ground dirty, if surface slope has changed */
02505   if (tileh_old != tileh_new) {
02506     /* If there is flat water on the lower halftile add the cost for clearing it */
02507     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price[PR_CLEAR_WATER]);
02508     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
02509   }
02510   return  cost;
02511 }
02512 
02513 static CommandCost TerraformTile_Track(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
02514 {
02515   uint z_old;
02516   Slope tileh_old = GetTileSlope(tile, &z_old);
02517   if (IsPlainRail(tile)) {
02518     TrackBits rail_bits = GetTrackBits(tile);
02519     /* Is there flat water on the lower halftile, that must be cleared expensively? */
02520     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
02521 
02522     _error_message = STR_ERROR_MUST_REMOVE_RAILROAD_TRACK;
02523 
02524     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
02525     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
02526 
02527     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
02528     Corner allowed_corner;
02529     switch (rail_bits) {
02530       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
02531       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
02532       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
02533       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
02534       default: return autoslope_result;
02535     }
02536 
02537     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
02538 
02539     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
02540     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
02541 
02542     /* Everything is valid, which only changes allowed_corner */
02543     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
02544       if (allowed_corner == corner) continue;
02545       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
02546     }
02547 
02548     /* Make the ground dirty */
02549     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
02550 
02551     /* allow terraforming */
02552     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price[PR_CLEAR_WATER] : (Money)0);
02553   } else if (_settings_game.construction.build_on_slopes && AutoslopeEnabled() &&
02554       AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) {
02555     return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
02556   }
02557   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
02558 }
02559 
02560 
02561 extern const TileTypeProcs _tile_type_rail_procs = {
02562   DrawTile_Track,           // draw_tile_proc
02563   GetSlopeZ_Track,          // get_slope_z_proc
02564   ClearTile_Track,          // clear_tile_proc
02565   NULL,                     // add_accepted_cargo_proc
02566   GetTileDesc_Track,        // get_tile_desc_proc
02567   GetTileTrackStatus_Track, // get_tile_track_status_proc
02568   ClickTile_Track,          // click_tile_proc
02569   NULL,                     // animate_tile_proc
02570   TileLoop_Track,           // tile_loop_clear
02571   ChangeTileOwner_Track,    // change_tile_owner_clear
02572   NULL,                     // add_produced_cargo_proc
02573   VehicleEnter_Track,       // vehicle_enter_tile_proc
02574   GetFoundation_Track,      // get_foundation_proc
02575   TerraformTile_Track,      // terraform_tile_proc
02576 };

Generated on Thu Feb 4 17:20:27 2010 for OpenTTD by  doxygen 1.5.6