# rail_cmd.cpp

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    00001 /* $Id$ */
    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 "viewport_func.h"
    00015 #include "command_func.h"
    00016 #include "depot_base.h"
    00017 #include "pathfinder/yapf/yapf_cache.h"
    00018 #include "newgrf_debug.h"
    00019 #include "newgrf_railtype.h"
    00020 #include "train.h"
    00021 #include "autoslope.h"
    00022 #include "water.h"
    00023 #include "tunnelbridge_map.h"
    00024 #include "vehicle_func.h"
    00025 #include "sound_func.h"
    00026 #include "tunnelbridge.h"
    00027 #include "elrail_func.h"
    00028 #include "town.h"
    00029 #include "pbs.h"
    00030 #include "company_base.h"
    00031 #include "core/backup_type.hpp"
    00032 #include "date_func.h"
    00033 #include "strings_func.h"
    00034 #include "company_gui.h"
    00035
    00036 #include "table/strings.h"
    00037 #include "table/railtypes.h"
    00038 #include "table/track_land.h"
    00039
    00041 typedef SmallVector<Train *, 16> TrainList;
    00042
    00043 RailtypeInfo _railtypes[RAILTYPE_END];
    00044
    00045 assert_compile(sizeof(_original_railtypes) <= sizeof(_railtypes));
    00046
    00050 void ResetRailTypes()
    00051 {
    00052   memset(_railtypes, 0, sizeof(_railtypes));
    00053   memcpy(_railtypes, _original_railtypes, sizeof(_original_railtypes));
    00054 }
    00055
    00056 void ResolveRailTypeGUISprites(RailtypeInfo *rti)
    00057 {
    00058   SpriteID cursors_base = GetCustomRailSprite(rti, INVALID_TILE, RTSG_CURSORS);
    00059   if (cursors_base != 0) {
    00060     rti->gui_sprites.build_ns_rail = cursors_base +  0;
    00061     rti->gui_sprites.build_x_rail  = cursors_base +  1;
    00062     rti->gui_sprites.build_ew_rail = cursors_base +  2;
    00063     rti->gui_sprites.build_y_rail  = cursors_base +  3;
    00064     rti->gui_sprites.auto_rail     = cursors_base +  4;
    00065     rti->gui_sprites.build_depot   = cursors_base +  5;
    00066     rti->gui_sprites.build_tunnel  = cursors_base +  6;
    00067     rti->gui_sprites.convert_rail  = cursors_base +  7;
    00068     rti->cursor.rail_ns   = cursors_base +  8;
    00069     rti->cursor.rail_swne = cursors_base +  9;
    00070     rti->cursor.rail_ew   = cursors_base + 10;
    00071     rti->cursor.rail_nwse = cursors_base + 11;
    00072     rti->cursor.autorail  = cursors_base + 12;
    00073     rti->cursor.depot     = cursors_base + 13;
    00074     rti->cursor.tunnel    = cursors_base + 14;
    00075     rti->cursor.convert   = cursors_base + 15;
    00076   }
    00077 }
    00078
    00082 void InitRailTypes()
    00083 {
    00084   for (RailType rt = RAILTYPE_BEGIN; rt != RAILTYPE_END; rt++) {
    00085     RailtypeInfo *rti = &_railtypes[rt];
    00086     ResolveRailTypeGUISprites(rti);
    00087   }
    00088 }
    00089
    00093 RailType AllocateRailType(RailTypeLabel label)
    00094 {
    00095   for (RailType rt = RAILTYPE_BEGIN; rt != RAILTYPE_END; rt++) {
    00096     RailtypeInfo *rti = &_railtypes[rt];
    00097
    00098     if (rti->label == 0) {
    00099       /* Set up new rail type */
    00100       memcpy(rti, &_railtypes[RAILTYPE_RAIL], sizeof(*rti));
    00101       rti->label = label;
    00102       /* Clear alternate label list. Can't use Reset() here as that would free
    00103        * the data pointer of RAILTYPE_RAIL and not our new rail type. */
    00104       new (&rti->alternate_labels) RailTypeLabelList;
    00105
    00106       /* Make us compatible with ourself. */
    00107       rti->powered_railtypes    = (RailTypes)(1 << rt);
    00108       rti->compatible_railtypes = (RailTypes)(1 << rt);
    00109
    00110       /* We also introduce ourself. */
    00111       rti->introduces_railtypes = (RailTypes)(1 << rt);
    00112
    00113       /* Default sort order; order of allocation, but with some
    00114        * offsets so it's easier for NewGRF to pick a spot without
    00115        * changing the order of other (original) rail types.
    00116        * The << is so you can place other railtypes in between the
    00117        * other railtypes, the 7 is to be able to place something
    00118        * before the first (default) rail type. */
    00119       rti->sorting_order = rt << 4 | 7;
    00120       return rt;
    00121     }
    00122   }
    00123
    00124   return INVALID_RAILTYPE;
    00125 }
    00126
    00127 static const byte _track_sloped_sprites[14] = {
    00128   14, 15, 22, 13,
    00129    0, 21, 17, 12,
    00130   23,  0, 18, 20,
    00131   19, 16
    00132 };
    00133
    00134
    00135 /*         4
    00136  *     ---------
    00137  *    |\       /|
    00138  *    | \    1/ |
    00139  *    |  \   /  |
    00140  *    |   \ /   |
    00141  *  16|    \    |32
    00142  *    |   / \2  |
    00143  *    |  /   \  |
    00144  *    | /     \ |
    00145  *    |/       \|
    00146  *     ---------
    00147  *         8
    00148  */
    00149
    00150
    00151
    00152 /* MAP2 byte:    abcd???? => Signal On? Same coding as map3lo
    00153  * MAP3LO byte:  abcd???? => Signal Exists?
    00154  *               a and b are for diagonals, upper and left,
    00155  *               one for each direction. (ie a == NE->SW, b ==
    00156  *               SW->NE, or v.v., I don't know. b and c are
    00157  *               similar for lower and right.
    00158  * MAP2 byte:    ????abcd => Type of ground.
    00159  * MAP3LO byte:  ????abcd => Type of rail.
    00160  * MAP5:         00abcdef => rail
    00161  *               01abcdef => rail w/ signals
    00162  *               10uuuuuu => unused
    00163  *               11uuuudd => rail depot
    00164  */
    00165
    00174 static CommandCost EnsureNoTrainOnTrack(TileIndex tile, Track track)
    00175 {
    00176   TrackBits rail_bits = TrackToTrackBits(track);
    00177   return EnsureNoTrainOnTrackBits(tile, rail_bits);
    00178 }
    00179
    00187 static CommandCost CheckTrackCombination(TileIndex tile, TrackBits to_build, uint flags)
    00188 {
    00189   if (!IsPlainRail(tile)) return_cmd_error(STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION);
    00190
    00191   /* So, we have a tile with tracks on it (and possibly signals). Let's see
    00192    * what tracks first */
    00193   TrackBits current = GetTrackBits(tile); // The current track layout.
    00194   TrackBits future = current | to_build;  // The track layout we want to build.
    00195
    00196   /* Are we really building something new? */
    00197   if (current == future) {
    00198     /* Nothing new is being built */
    00199     return_cmd_error(STR_ERROR_ALREADY_BUILT);
    00200   }
    00201
    00202   /* Let's see if we may build this */
    00203   if ((flags & DC_NO_RAIL_OVERLAP) || HasSignals(tile)) {
    00204     /* If we are not allowed to overlap (flag is on for ai companies or we have
    00205      * signals on the tile), check that */
    00206     if (future != TRACK_BIT_HORZ && future != TRACK_BIT_VERT) {
    00207       return_cmd_error((flags & DC_NO_RAIL_OVERLAP) ? STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION : STR_ERROR_MUST_REMOVE_SIGNALS_FIRST);
    00208     }
    00209   }
    00210   /* Normally, we may overlap and any combination is valid */
    00211   return CommandCost();
    00212 }
    00213
    00214
    00216 static const TrackBits _valid_tracks_without_foundation[15] = {
    00217   TRACK_BIT_ALL,
    00218   TRACK_BIT_RIGHT,
    00219   TRACK_BIT_UPPER,
    00220   TRACK_BIT_X,
    00221
    00222   TRACK_BIT_LEFT,
    00223   TRACK_BIT_NONE,
    00224   TRACK_BIT_Y,
    00225   TRACK_BIT_LOWER,
    00226
    00227   TRACK_BIT_LOWER,
    00228   TRACK_BIT_Y,
    00229   TRACK_BIT_NONE,
    00230   TRACK_BIT_LEFT,
    00231
    00232   TRACK_BIT_X,
    00233   TRACK_BIT_UPPER,
    00234   TRACK_BIT_RIGHT,
    00235 };
    00236
    00238 static const TrackBits _valid_tracks_on_leveled_foundation[15] = {
    00239   TRACK_BIT_NONE,
    00240   TRACK_BIT_LEFT,
    00241   TRACK_BIT_LOWER,
    00242   TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,
    00243
    00244   TRACK_BIT_RIGHT,
    00245   TRACK_BIT_ALL,
    00246   TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,
    00247   TRACK_BIT_ALL,
    00248
    00249   TRACK_BIT_UPPER,
    00250   TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,
    00251   TRACK_BIT_ALL,
    00252   TRACK_BIT_ALL,
    00253
    00254   TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,
    00255   TRACK_BIT_ALL,
    00256   TRACK_BIT_ALL
    00257 };
    00258
    00266 Foundation GetRailFoundation(Slope tileh, TrackBits bits)
    00267 {
    00268   if (bits == TRACK_BIT_NONE) return FOUNDATION_NONE;
    00269
    00270   if (IsSteepSlope(tileh)) {
    00271     /* Test for inclined foundations */
    00272     if (bits == TRACK_BIT_X) return FOUNDATION_INCLINED_X;
    00273     if (bits == TRACK_BIT_Y) return FOUNDATION_INCLINED_Y;
    00274
    00275     /* Get higher track */
    00276     Corner highest_corner = GetHighestSlopeCorner(tileh);
    00277     TrackBits higher_track = CornerToTrackBits(highest_corner);
    00278
    00279     /* Only higher track? */
    00280     if (bits == higher_track) return HalftileFoundation(highest_corner);
    00281
    00282     /* Overlap with higher track? */
    00283     if (TracksOverlap(bits | higher_track)) return FOUNDATION_INVALID;
    00284
    00285     /* either lower track or both higher and lower track */
    00286     return ((bits & higher_track) != 0 ? FOUNDATION_STEEP_BOTH : FOUNDATION_STEEP_LOWER);
    00287   } else {
    00288     if ((~_valid_tracks_without_foundation[tileh] & bits) == 0) return FOUNDATION_NONE;
    00289
    00290     bool valid_on_leveled = ((~_valid_tracks_on_leveled_foundation[tileh] & bits) == 0);
    00291
    00292     Corner track_corner;
    00293     switch (bits) {
    00294       case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
    00295       case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
    00296       case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
    00297       case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
    00298
    00299       case TRACK_BIT_HORZ:
    00300         if (tileh == SLOPE_N) return HalftileFoundation(CORNER_N);
    00301         if (tileh == SLOPE_S) return HalftileFoundation(CORNER_S);
    00302         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00303
    00304       case TRACK_BIT_VERT:
    00305         if (tileh == SLOPE_W) return HalftileFoundation(CORNER_W);
    00306         if (tileh == SLOPE_E) return HalftileFoundation(CORNER_E);
    00307         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00308
    00309       case TRACK_BIT_X:
    00310         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_X;
    00311         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00312
    00313       case TRACK_BIT_Y:
    00314         if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_Y;
    00315         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00316
    00317       default:
    00318         return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);
    00319     }
    00320     /* Single diagonal track */
    00321
    00322     /* Track must be at least valid on leveled foundation */
    00323     if (!valid_on_leveled) return FOUNDATION_INVALID;
    00324
    00325     /* If slope has three raised corners, build leveled foundation */
    00326     if (IsSlopeWithThreeCornersRaised(tileh)) return FOUNDATION_LEVELED;
    00327
    00328     /* If neighboured corners of track_corner are lowered, build halftile foundation */
    00329     if ((tileh & SlopeWithThreeCornersRaised(OppositeCorner(track_corner))) == SlopeWithOneCornerRaised(track_corner)) return HalftileFoundation(track_corner);
    00330
    00331     /* else special anti-zig-zag foundation */
    00332     return SpecialRailFoundation(track_corner);
    00333   }
    00334 }
    00335
    00336
    00346 static CommandCost CheckRailSlope(Slope tileh, TrackBits rail_bits, TrackBits existing, TileIndex tile)
    00347 {
    00348   /* don't allow building on the lower side of a coast */
    00349   if (GetFloodingBehaviour(tile) != FLOOD_NONE) {
    00350     if (!IsSteepSlope(tileh) && ((~_valid_tracks_on_leveled_foundation[tileh] & (rail_bits | existing)) != 0)) return_cmd_error(STR_ERROR_CAN_T_BUILD_ON_WATER);
    00351   }
    00352
    00353   Foundation f_new = GetRailFoundation(tileh, rail_bits | existing);
    00354
    00355   /* check track/slope combination */
    00356   if ((f_new == FOUNDATION_INVALID) ||
    00357       ((f_new != FOUNDATION_NONE) && (!_settings_game.construction.build_on_slopes))) {
    00358     return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
    00359   }
    00360
    00361   Foundation f_old = GetRailFoundation(tileh, existing);
    00362   return CommandCost(EXPENSES_CONSTRUCTION, f_new != f_old ? _price[PR_BUILD_FOUNDATION] : (Money)0);
    00363 }
    00364
    00365 /* Validate functions for rail building */
    00366 static inline bool ValParamTrackOrientation(Track track)
    00367 {
    00368   return IsValidTrack(track);
    00369 }
    00370
    00380 CommandCost CmdBuildSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00381 {
    00382   RailType railtype = Extract<RailType, 0, 4>(p1);
    00383   Track track = Extract<Track, 0, 3>(p2);
    00384   CommandCost cost(EXPENSES_CONSTRUCTION);
    00385
    00386   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
    00387
    00388   Slope tileh = GetTileSlope(tile);
    00389   TrackBits trackbit = TrackToTrackBits(track);
    00390
    00391   switch (GetTileType(tile)) {
    00392     case MP_RAILWAY: {
    00393       CommandCost ret = CheckTileOwnership(tile);
    00394       if (ret.Failed()) return ret;
    00395
    00396       if (!IsPlainRail(tile)) return CMD_ERROR;
    00397
    00398       if (!IsCompatibleRail(GetRailType(tile), railtype)) return_cmd_error(STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION);
    00399
    00400       ret = CheckTrackCombination(tile, trackbit, flags);
    00401       if (ret.Succeeded()) ret = EnsureNoTrainOnTrack(tile, track);
    00402       if (ret.Failed()) return ret;
    00403
    00404       ret = CheckRailSlope(tileh, trackbit, GetTrackBits(tile), tile);
    00405       if (ret.Failed()) return ret;
    00406       cost.AddCost(ret);
    00407
    00408       /* If the rail types don't match, try to convert only if engines of
    00409        * the new rail type are not powered on the present rail type and engines of
    00410        * the present rail type are powered on the new rail type. */
    00411       if (GetRailType(tile) != railtype && !HasPowerOnRail(railtype, GetRailType(tile))) {
    00412         if (HasPowerOnRail(GetRailType(tile), railtype)) {
    00413           ret = DoCommand(tile, tile, railtype, flags, CMD_CONVERT_RAIL);
    00414           if (ret.Failed()) return ret;
    00415           cost.AddCost(ret);
    00416         } else {
    00417           return CMD_ERROR;
    00418         }
    00419       }
    00420
    00421       if (flags & DC_EXEC) {
    00422         SetRailGroundType(tile, RAIL_GROUND_BARREN);
    00423         TrackBits bits = GetTrackBits(tile);
    00424         SetTrackBits(tile, bits | trackbit);
    00425         /* Subtract old infrastructure count. */
    00426         uint pieces = CountBits(bits);
    00427         if (TracksOverlap(bits)) pieces *= pieces;
    00428         Company::Get(GetTileOwner(tile))->infrastructure.rail[GetRailType(tile)] -= pieces;
    00429         /* Add new infrastructure count. */
    00430         pieces = CountBits(bits | trackbit);
    00431         if (TracksOverlap(bits | trackbit)) pieces *= pieces;
    00432         Company::Get(GetTileOwner(tile))->infrastructure.rail[GetRailType(tile)] += pieces;
    00433         DirtyCompanyInfrastructureWindows(GetTileOwner(tile));
    00434       }
    00435       break;
    00436     }
    00437
    00438     case MP_ROAD: {
    00439       /* Level crossings may only be built on these slopes */
    00440       if (!HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh)) return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
    00441
    00442       CommandCost ret = EnsureNoVehicleOnGround(tile);
    00443       if (ret.Failed()) return ret;
    00444
    00445       if (IsNormalRoad(tile)) {
    00446         if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
    00447
    00448         if (GetDisallowedRoadDirections(tile) != DRD_NONE) return_cmd_error(STR_ERROR_CROSSING_ON_ONEWAY_ROAD);
    00449
    00450         if (RailNoLevelCrossings(railtype)) return_cmd_error(STR_ERROR_CROSSING_DISALLOWED);
    00451
    00452         RoadTypes roadtypes = GetRoadTypes(tile);
    00453         RoadBits road = GetRoadBits(tile, ROADTYPE_ROAD);
    00454         RoadBits tram = GetRoadBits(tile, ROADTYPE_TRAM);
    00455         switch (roadtypes) {
    00456           default: break;
    00457           case ROADTYPES_TRAM:
    00458             /* Tram crossings must always have road. */
    00459             if (flags & DC_EXEC) {
    00460               SetRoadOwner(tile, ROADTYPE_ROAD, _current_company);
    00461               Company *c = Company::GetIfValid(_current_company);
    00462               if (c != NULL) {
    00463                 /* A full diagonal tile has two road bits. */
    00464                 c->infrastructure.road[ROADTYPE_ROAD] += 2;
    00465                 DirtyCompanyInfrastructureWindows(c->index);
    00466               }
    00467             }
    00468             roadtypes |= ROADTYPES_ROAD;
    00469             break;
    00470
    00471           case ROADTYPES_ALL:
    00472             if (road != tram) return CMD_ERROR;
    00473             break;
    00474         }
    00475
    00476         road |= tram;
    00477
    00478         if ((track == TRACK_X && road == ROAD_Y) ||
    00479             (track == TRACK_Y && road == ROAD_X)) {
    00480           if (flags & DC_EXEC) {
    00481             MakeRoadCrossing(tile, GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), _current_company, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, roadtypes, GetTownIndex(tile));
    00482             UpdateLevelCrossing(tile, false);
    00483             Company::Get(_current_company)->infrastructure.rail[railtype] += LEVELCROSSING_TRACKBIT_FACTOR;
    00484             DirtyCompanyInfrastructureWindows(_current_company);
    00485           }
    00486           break;
    00487         }
    00488       }
    00489
    00490       if (IsLevelCrossing(tile) && GetCrossingRailBits(tile) == trackbit) {
    00491         return_cmd_error(STR_ERROR_ALREADY_BUILT);
    00492       }
    00493       /* FALL THROUGH */
    00494     }
    00495
    00496     default: {
    00497       /* Will there be flat water on the lower halftile? */
    00498       bool water_ground = IsTileType(tile, MP_WATER) && IsSlopeWithOneCornerRaised(tileh);
    00499
    00500       CommandCost ret = CheckRailSlope(tileh, trackbit, TRACK_BIT_NONE, tile);
    00501       if (ret.Failed()) return ret;
    00502       cost.AddCost(ret);
    00503
    00504       ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00505       if (ret.Failed()) return ret;
    00506       cost.AddCost(ret);
    00507
    00508       if (water_ground) {
    00509         cost.AddCost(-_price[PR_CLEAR_WATER]);
    00510         cost.AddCost(_price[PR_CLEAR_ROUGH]);
    00511       }
    00512
    00513       if (flags & DC_EXEC) {
    00514         MakeRailNormal(tile, _current_company, trackbit, railtype);
    00515         if (water_ground) SetRailGroundType(tile, RAIL_GROUND_WATER);
    00516         Company::Get(_current_company)->infrastructure.rail[railtype]++;
    00517         DirtyCompanyInfrastructureWindows(_current_company);
    00518       }
    00519       break;
    00520     }
    00521   }
    00522
    00523   if (flags & DC_EXEC) {
    00524     MarkTileDirtyByTile(tile);
    00525     AddTrackToSignalBuffer(tile, track, _current_company);
    00526     YapfNotifyTrackLayoutChange(tile, track);
    00527   }
    00528
    00529   cost.AddCost(RailBuildCost(railtype));
    00530   return cost;
    00531 }
    00532
    00542 CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00543 {
    00544   Track track = Extract<Track, 0, 3>(p2);
    00545   CommandCost cost(EXPENSES_CONSTRUCTION);
    00546   bool crossing = false;
    00547
    00548   if (!ValParamTrackOrientation(track)) return CMD_ERROR;
    00549   TrackBits trackbit = TrackToTrackBits(track);
    00550
    00551   /* Need to read tile owner now because it may change when the rail is removed
    00552    * Also, in case of floods, _current_company != owner
    00553    * There may be invalid tiletype even in exec run (when removing long track),
    00554    * so do not call GetTileOwner(tile) in any case here */
    00555   Owner owner = INVALID_OWNER;
    00556
    00557   Train *v = NULL;
    00558
    00559   switch (GetTileType(tile)) {
    00560     case MP_ROAD: {
    00561       if (!IsLevelCrossing(tile) || GetCrossingRailBits(tile) != trackbit) return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
    00562
    00563       if (_current_company != OWNER_WATER) {
    00564         CommandCost ret = CheckTileOwnership(tile);
    00565         if (ret.Failed()) return ret;
    00566       }
    00567
    00568       if (!(flags & DC_BANKRUPT)) {
    00569         CommandCost ret = EnsureNoVehicleOnGround(tile);
    00570         if (ret.Failed()) return ret;
    00571       }
    00572
    00573       cost.AddCost(RailClearCost(GetRailType(tile)));
    00574
    00575       if (flags & DC_EXEC) {
    00576         if (HasReservedTracks(tile, trackbit)) {
    00577           v = GetTrainForReservation(tile, track);
    00578           if (v != NULL) FreeTrainTrackReservation(v);
    00579         }
    00580         owner = GetTileOwner(tile);
    00581         Company::Get(owner)->infrastructure.rail[GetRailType(tile)] -= LEVELCROSSING_TRACKBIT_FACTOR;
    00582         DirtyCompanyInfrastructureWindows(owner);
    00583         MakeRoadNormal(tile, GetCrossingRoadBits(tile), GetRoadTypes(tile), GetTownIndex(tile), GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM));
    00584         DeleteNewGRFInspectWindow(GSF_RAILTYPES, tile);
    00585       }
    00586       break;
    00587     }
    00588
    00589     case MP_RAILWAY: {
    00590       TrackBits present;
    00591       /* There are no rails present at depots. */
    00592       if (!IsPlainRail(tile)) return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
    00593
    00594       if (_current_company != OWNER_WATER) {
    00595         CommandCost ret = CheckTileOwnership(tile);
    00596         if (ret.Failed()) return ret;
    00597       }
    00598
    00599       CommandCost ret = EnsureNoTrainOnTrack(tile, track);
    00600       if (ret.Failed()) return ret;
    00601
    00602       present = GetTrackBits(tile);
    00603       if ((present & trackbit) == 0) return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
    00604       if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
    00605
    00606       cost.AddCost(RailClearCost(GetRailType(tile)));
    00607
    00608       /* Charge extra to remove signals on the track, if they are there */
    00609       if (HasSignalOnTrack(tile, track)) {
    00610         cost.AddCost(DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS));
    00611       }
    00612
    00613       if (flags & DC_EXEC) {
    00614         if (HasReservedTracks(tile, trackbit)) {
    00615           v = GetTrainForReservation(tile, track);
    00616           if (v != NULL) FreeTrainTrackReservation(v);
    00617         }
    00618
    00619         owner = GetTileOwner(tile);
    00620
    00621         /* Subtract old infrastructure count. */
    00622         uint pieces = CountBits(present);
    00623         if (TracksOverlap(present)) pieces *= pieces;
    00624         Company::Get(owner)->infrastructure.rail[GetRailType(tile)] -= pieces;
    00625         /* Add new infrastructure count. */
    00626         present ^= trackbit;
    00627         pieces = CountBits(present);
    00628         if (TracksOverlap(present)) pieces *= pieces;
    00629         Company::Get(owner)->infrastructure.rail[GetRailType(tile)] += pieces;
    00630         DirtyCompanyInfrastructureWindows(owner);
    00631
    00632         if (present == 0) {
    00633           Slope tileh = GetTileSlope(tile);
    00634           /* If there is flat water on the lower halftile, convert the tile to shore so the water remains */
    00635           if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh)) {
    00636             MakeShore(tile);
    00637           } else {
    00638             DoClearSquare(tile);
    00639           }
    00640           DeleteNewGRFInspectWindow(GSF_RAILTYPES, tile);
    00641         } else {
    00642           SetTrackBits(tile, present);
    00643           SetTrackReservation(tile, GetRailReservationTrackBits(tile) & present);
    00644         }
    00645       }
    00646       break;
    00647     }
    00648
    00649     default: return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
    00650   }
    00651
    00652   if (flags & DC_EXEC) {
    00653     /* if we got that far, 'owner' variable is set correctly */
    00654     assert(Company::IsValidID(owner));
    00655
    00656     MarkTileDirtyByTile(tile);
    00657     if (crossing) {
    00658       /* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we
    00659        * are removing one of these pieces, we'll need to update signals for
    00660        * both directions explicitly, as after the track is removed it won't
    00661        * 'connect' with the other piece. */
    00662       AddTrackToSignalBuffer(tile, TRACK_X, owner);
    00663       AddTrackToSignalBuffer(tile, TRACK_Y, owner);
    00664       YapfNotifyTrackLayoutChange(tile, TRACK_X);
    00665       YapfNotifyTrackLayoutChange(tile, TRACK_Y);
    00666     } else {
    00667       AddTrackToSignalBuffer(tile, track, owner);
    00668       YapfNotifyTrackLayoutChange(tile, track);
    00669     }
    00670
    00671     if (v != NULL) TryPathReserve(v, true);
    00672   }
    00673
    00674   return cost;
    00675 }
    00676
    00677
    00685 bool FloodHalftile(TileIndex t)
    00686 {
    00687   assert(IsPlainRailTile(t));
    00688
    00689   bool flooded = false;
    00690   if (GetRailGroundType(t) == RAIL_GROUND_WATER) return flooded;
    00691
    00692   Slope tileh = GetTileSlope(t);
    00693   TrackBits rail_bits = GetTrackBits(t);
    00694
    00695   if (IsSlopeWithOneCornerRaised(tileh)) {
    00696     TrackBits lower_track = CornerToTrackBits(OppositeCorner(GetHighestSlopeCorner(tileh)));
    00697
    00698     TrackBits to_remove = lower_track & rail_bits;
    00699     if (to_remove != 0) {
    00700       Backup<CompanyByte> cur_company(_current_company, OWNER_WATER, FILE_LINE);
    00701       flooded = DoCommand(t, 0, FIND_FIRST_BIT(to_remove), DC_EXEC, CMD_REMOVE_SINGLE_RAIL).Succeeded();
    00702       cur_company.Restore();
    00703       if (!flooded) return flooded; // not yet floodable
    00704       rail_bits = rail_bits & ~to_remove;
    00705       if (rail_bits == 0) {
    00706         MakeShore(t);
    00707         MarkTileDirtyByTile(t);
    00708         return flooded;
    00709       }
    00710     }
    00711
    00712     if (IsNonContinuousFoundation(GetRailFoundation(tileh, rail_bits))) {
    00713       flooded = true;
    00714       SetRailGroundType(t, RAIL_GROUND_WATER);
    00715       MarkTileDirtyByTile(t);
    00716     }
    00717   } else {
    00718     /* Make shore on steep slopes and 'three-corners-raised'-slopes. */
    00719     if (ApplyFoundationToSlope(GetRailFoundation(tileh, rail_bits), &tileh) == 0) {
    00720       if (IsSteepSlope(tileh) || IsSlopeWithThreeCornersRaised(tileh)) {
    00721         flooded = true;
    00722         SetRailGroundType(t, RAIL_GROUND_WATER);
    00723         MarkTileDirtyByTile(t);
    00724       }
    00725     }
    00726   }
    00727   return flooded;
    00728 }
    00729
    00730 static const TileIndexDiffC _trackdelta[] = {
    00731   { -1,  0 }, {  0,  1 }, { -1,  0 }, {  0,  1 }, {  1,  0 }, {  0,  1 },
    00732   {  0,  0 },
    00733   {  0,  0 },
    00734   {  1,  0 }, {  0, -1 }, {  0, -1 }, {  1,  0 }, {  0, -1 }, { -1,  0 },
    00735   {  0,  0 },
    00736   {  0,  0 }
    00737 };
    00738
    00739
    00740 static CommandCost ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)
    00741 {
    00742   int x = TileX(start);
    00743   int y = TileY(start);
    00744   int ex = TileX(end);
    00745   int ey = TileY(end);
    00746
    00747   if (!ValParamTrackOrientation(TrackdirToTrack(*trackdir))) return CMD_ERROR;
    00748
    00749   /* calculate delta x,y from start to end tile */
    00750   int dx = ex - x;
    00751   int dy = ey - y;
    00752
    00753   /* calculate delta x,y for the first direction */
    00754   int trdx = _trackdelta[*trackdir].x;
    00755   int trdy = _trackdelta[*trackdir].y;
    00756
    00757   if (!IsDiagonalTrackdir(*trackdir)) {
    00758     trdx += _trackdelta[*trackdir ^ 1].x;
    00759     trdy += _trackdelta[*trackdir ^ 1].y;
    00760   }
    00761
    00762   /* validate the direction */
    00763   while ((trdx <= 0 && dx > 0) ||
    00764       (trdx >= 0 && dx < 0) ||
    00765       (trdy <= 0 && dy > 0) ||
    00766       (trdy >= 0 && dy < 0)) {
    00767     if (!HasBit(*trackdir, 3)) { // first direction is invalid, try the other
    00768       SetBit(*trackdir, 3); // reverse the direction
    00769       trdx = -trdx;
    00770       trdy = -trdy;
    00771     } else { // other direction is invalid too, invalid drag
    00772       return CMD_ERROR;
    00773     }
    00774   }
    00775
    00776   /* (for diagonal tracks, this is already made sure of by above test), but:
    00777    * for non-diagonal tracks, check if the start and end tile are on 1 line */
    00778   if (!IsDiagonalTrackdir(*trackdir)) {
    00779     trdx = _trackdelta[*trackdir].x;
    00780     trdy = _trackdelta[*trackdir].y;
    00781     if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx)) return CMD_ERROR;
    00782   }
    00783
    00784   return CommandCost();
    00785 }
    00786
    00800 static CommandCost CmdRailTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00801 {
    00802   CommandCost total_cost(EXPENSES_CONSTRUCTION);
    00803   Track track = Extract<Track, 4, 3>(p2);
    00804   bool remove = HasBit(p2, 7);
    00805   RailType railtype = Extract<RailType, 0, 4>(p2);
    00806
    00807   if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
    00808   if (p1 >= MapSize()) return CMD_ERROR;
    00809   TileIndex end_tile = p1;
    00810   Trackdir trackdir = TrackToTrackdir(track);
    00811
    00812   CommandCost ret = ValidateAutoDrag(&trackdir, tile, end_tile);
    00813   if (ret.Failed()) return ret;
    00814
    00815   if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, tile);
    00816
    00817   bool had_success = false;
    00818   CommandCost last_error = CMD_ERROR;
    00819   for (;;) {
    00820     CommandCost ret = DoCommand(tile, railtype, TrackdirToTrack(trackdir), flags, remove ? CMD_REMOVE_SINGLE_RAIL : CMD_BUILD_SINGLE_RAIL);
    00821
    00822     if (ret.Failed()) {
    00823       last_error = ret;
    00824       if (last_error.GetErrorMessage() != STR_ERROR_ALREADY_BUILT && !remove) {
    00825         if (HasBit(p2, 8)) return last_error;
    00826         break;
    00827       }
    00828
    00829       /* Ownership errors are more important. */
    00830       if (last_error.GetErrorMessage() == STR_ERROR_OWNED_BY && remove) break;
    00831     } else {
    00832       had_success = true;
    00833       total_cost.AddCost(ret);
    00834     }
    00835
    00836     if (tile == end_tile) break;
    00837
    00838     tile += ToTileIndexDiff(_trackdelta[trackdir]);
    00839
    00840     /* toggle railbit for the non-diagonal tracks */
    00841     if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
    00842   }
    00843
    00844   if (had_success) return total_cost;
    00845   return last_error;
    00846 }
    00847
    00862 CommandCost CmdBuildRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00863 {
    00864   return CmdRailTrackHelper(tile, flags, p1, ClrBit(p2, 7), text);
    00865 }
    00866
    00881 CommandCost CmdRemoveRailroadTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00882 {
    00883   return CmdRailTrackHelper(tile, flags, p1, SetBit(p2, 7), text);
    00884 }
    00885
    00898 CommandCost CmdBuildTrainDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00899 {
    00900   /* check railtype and valid direction for depot (0 through 3), 4 in total */
    00901   RailType railtype = Extract<RailType, 0, 4>(p1);
    00902   if (!ValParamRailtype(railtype)) return CMD_ERROR;
    00903
    00904   Slope tileh = GetTileSlope(tile);
    00905
    00906   DiagDirection dir = Extract<DiagDirection, 0, 2>(p2);
    00907
    00908   /* Prohibit construction if
    00909    * The tile is non-flat AND
    00910    * 1) build-on-slopes is disabled
    00911    * 2) the tile is steep i.e. spans two height levels
    00912    * 3) the exit points in the wrong direction
    00913    */
    00914
    00915   if (tileh != SLOPE_FLAT && (
    00916         !_settings_game.construction.build_on_slopes ||
    00917         !CanBuildDepotByTileh(dir, tileh)
    00918       )) {
    00919     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
    00920   }
    00921
    00922   CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00923   if (cost.Failed()) return cost;
    00924
    00925   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
    00926
    00927   if (!Depot::CanAllocateItem()) return CMD_ERROR;
    00928
    00929   if (flags & DC_EXEC) {
    00930     Depot *d = new Depot(tile);
    00931     d->build_date = _date;
    00932
    00933     MakeRailDepot(tile, _current_company, d->index, dir, railtype);
    00934     MarkTileDirtyByTile(tile);
    00935     MakeDefaultName(d);
    00936
    00937     Company::Get(_current_company)->infrastructure.rail[railtype]++;
    00938     DirtyCompanyInfrastructureWindows(_current_company);
    00939
    00940     AddSideToSignalBuffer(tile, INVALID_DIAGDIR, _current_company);
    00941     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
    00942   }
    00943
    00944   cost.AddCost(_price[PR_BUILD_DEPOT_TRAIN]);
    00945   cost.AddCost(RailBuildCost(railtype));
    00946   return cost;
    00947 }
    00948
    00970 CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00971 {
    00972   Track track = Extract<Track, 0, 3>(p1);
    00973   bool ctrl_pressed = HasBit(p1, 3); // was the CTRL button pressed
    00974   SignalVariant sigvar = (ctrl_pressed ^ HasBit(p1, 4)) ? SIG_SEMAPHORE : SIG_ELECTRIC; // the signal variant of the new signal
    00975   SignalType sigtype = Extract<SignalType, 5, 3>(p1); // the signal type of the new signal
    00976   bool convert_signal = HasBit(p1, 8); // convert button pressed
    00977   SignalType cycle_start = Extract<SignalType, 9, 3>(p1);
    00978   SignalType cycle_stop = Extract<SignalType, 12, 3>(p1);
    00979   uint num_dir_cycle = GB(p1, 15, 2);
    00980
    00981   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
    00982   if (cycle_start > cycle_stop || cycle_stop > SIGTYPE_LAST) return CMD_ERROR;
    00983
    00984   /* You can only build signals on plain rail tiles, and the selected track must exist */
    00985   if (!ValParamTrackOrientation(track) || !IsPlainRailTile(tile) ||
    00986       !HasTrack(tile, track)) {
    00987     return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
    00988   }
    00989   CommandCost ret = EnsureNoTrainOnTrack(tile, track);
    00990   if (ret.Failed()) return ret;
    00991
    00992   /* Protect against invalid signal copying */
    00993   if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
    00994
    00995   ret = CheckTileOwnership(tile);
    00996   if (ret.Failed()) return ret;
    00997
    00998   {
    00999     /* See if this is a valid track combination for signals, (ie, no overlap) */
    01000     TrackBits trackbits = GetTrackBits(tile);
    01001     if (KillFirstBit(trackbits) != TRACK_BIT_NONE && // More than one track present
    01002         trackbits != TRACK_BIT_HORZ &&
    01003         trackbits != TRACK_BIT_VERT) {
    01004       return_cmd_error(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK);
    01005     }
    01006   }
    01007
    01008   /* In case we don't want to change an existing signal, return without error. */
    01009   if (HasBit(p1, 17) && HasSignalOnTrack(tile, track)) return CommandCost();
    01010
    01011   /* you can not convert a signal if no signal is on track */
    01012   if (convert_signal && !HasSignalOnTrack(tile, track)) return_cmd_error(STR_ERROR_THERE_ARE_NO_SIGNALS);
    01013
    01014   CommandCost cost;
    01015   if (!HasSignalOnTrack(tile, track)) {
    01016     /* build new signals */
    01017     cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS]);
    01018   } else {
    01019     if (p2 != 0 && sigvar != GetSignalVariant(tile, track)) {
    01020       /* convert signals <-> semaphores */
    01021       cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
    01022
    01023     } else if (convert_signal) {
    01024       /* convert button pressed */
    01025       if (ctrl_pressed || GetSignalVariant(tile, track) != sigvar) {
    01026         /* convert electric <-> semaphore */
    01027         cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_SIGNALS] + _price[PR_CLEAR_SIGNALS]);
    01028       } else {
    01029         /* it is free to change signal type: normal-pre-exit-combo */
    01030         cost = CommandCost();
    01031       }
    01032
    01033     } else {
    01034       /* it is free to change orientation/pre-exit-combo signals */
    01035       cost = CommandCost();
    01036     }
    01037   }
    01038
    01039   if (flags & DC_EXEC) {
    01040     Train *v = NULL;
    01041     /* The new/changed signal could block our path. As this can lead to
    01042      * stale reservations, we clear the path reservation here and try
    01043      * to redo it later on. */
    01044     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
    01045       v = GetTrainForReservation(tile, track);
    01046       if (v != NULL) FreeTrainTrackReservation(v);
    01047     }
    01048
    01049     if (!HasSignals(tile)) {
    01050       /* there are no signals at all on this tile yet */
    01051       SetHasSignals(tile, true);
    01052       SetSignalStates(tile, 0xF); // all signals are on
    01053       SetPresentSignals(tile, 0); // no signals built by default
    01054       SetSignalType(tile, track, sigtype);
    01055       SetSignalVariant(tile, track, sigvar);
    01056     }
    01057
    01058     /* Subtract old signal infrastructure count. */
    01059     Company::Get(GetTileOwner(tile))->infrastructure.signal -= CountBits(GetPresentSignals(tile));
    01060
    01061     if (p2 == 0) {
    01062       if (!HasSignalOnTrack(tile, track)) {
    01063         /* build new signals */
    01064         SetPresentSignals(tile, GetPresentSignals(tile) | (IsPbsSignal(sigtype) ? KillFirstBit(SignalOnTrack(track)) : SignalOnTrack(track)));
    01065         SetSignalType(tile, track, sigtype);
    01066         SetSignalVariant(tile, track, sigvar);
    01067         while (num_dir_cycle-- > 0) CycleSignalSide(tile, track);
    01068       } else {
    01069         if (convert_signal) {
    01070           /* convert signal button pressed */
    01071           if (ctrl_pressed) {
    01072             /* toggle the pressent signal variant: SIG_ELECTRIC <-> SIG_SEMAPHORE */
    01073             SetSignalVariant(tile, track, (GetSignalVariant(tile, track) == SIG_ELECTRIC) ? SIG_SEMAPHORE : SIG_ELECTRIC);
    01074             /* Query current signal type so the check for PBS signals below works. */
    01075             sigtype = GetSignalType(tile, track);
    01076           } else {
    01077             /* convert the present signal to the chosen type and variant */
    01078             SetSignalType(tile, track, sigtype);
    01079             SetSignalVariant(tile, track, sigvar);
    01080             if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
    01081               SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
    01082             }
    01083           }
    01084
    01085         } else if (ctrl_pressed) {
    01086           /* cycle between cycle_start and cycle_end */
    01087           sigtype = (SignalType)(GetSignalType(tile, track) + 1);
    01088
    01089           if (sigtype < cycle_start || sigtype > cycle_stop) sigtype = cycle_start;
    01090
    01091           SetSignalType(tile, track, sigtype);
    01092           if (IsPbsSignal(sigtype) && (GetPresentSignals(tile) & SignalOnTrack(track)) == SignalOnTrack(track)) {
    01093             SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | KillFirstBit(SignalOnTrack(track)));
    01094           }
    01095         } else {
    01096           /* cycle the signal side: both -> left -> right -> both -> ... */
    01097           CycleSignalSide(tile, track);
    01098           /* Query current signal type so the check for PBS signals below works. */
    01099           sigtype = GetSignalType(tile, track);
    01100         }
    01101       }
    01102     } else {
    01103       /* If CmdBuildManySignals is called with copying signals, just copy the
    01104        * direction of the first signal given as parameter by CmdBuildManySignals */
    01105       SetPresentSignals(tile, (GetPresentSignals(tile) & ~SignalOnTrack(track)) | (p2 & SignalOnTrack(track)));
    01106       SetSignalVariant(tile, track, sigvar);
    01107       SetSignalType(tile, track, sigtype);
    01108     }
    01109
    01110     /* Add new signal infrastructure count. */
    01111     Company::Get(GetTileOwner(tile))->infrastructure.signal += CountBits(GetPresentSignals(tile));
    01112     DirtyCompanyInfrastructureWindows(GetTileOwner(tile));
    01113
    01114     if (IsPbsSignal(sigtype)) {
    01115       /* PBS signals should show red unless they are on a reservation. */
    01116       uint mask = GetPresentSignals(tile) & SignalOnTrack(track);
    01117       SetSignalStates(tile, (GetSignalStates(tile) & ~mask) | ((HasBit(GetRailReservationTrackBits(tile), track) ? UINT_MAX : 0) & mask));
    01118     }
    01119     MarkTileDirtyByTile(tile);
    01120     AddTrackToSignalBuffer(tile, track, _current_company);
    01121     YapfNotifyTrackLayoutChange(tile, track);
    01122     if (v != NULL) {
    01123       /* Extend the train's path if it's not stopped or loading, or not at a safe position. */
    01124       if (!(((v->vehstatus & VS_STOPPED) && v->cur_speed == 0) || v->current_order.IsType(OT_LOADING)) ||
    01125           !IsSafeWaitingPosition(v, v->tile, v->GetVehicleTrackdir(), true, _settings_game.pf.forbid_90_deg)) {
    01126         TryPathReserve(v, true);
    01127       }
    01128     }
    01129   }
    01130
    01131   return cost;
    01132 }
    01133
    01134 static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
    01135 {
    01136   tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
    01137   if (tile == INVALID_TILE) return false;
    01138
    01139   /* Check for track bits on the new tile */
    01140   TrackdirBits trackdirbits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
    01141
    01142   if (TracksOverlap(TrackdirBitsToTrackBits(trackdirbits))) return false;
    01143   trackdirbits &= TrackdirReachesTrackdirs(trackdir);
    01144
    01145   /* No track bits, must stop */
    01146   if (trackdirbits == TRACKDIR_BIT_NONE) return false;
    01147
    01148   /* Get the first track dir */
    01149   trackdir = RemoveFirstTrackdir(&trackdirbits);
    01150
    01151   /* Any left? It's a junction so we stop */
    01152   if (trackdirbits != TRACKDIR_BIT_NONE) return false;
    01153
    01154   switch (GetTileType(tile)) {
    01155     case MP_RAILWAY:
    01156       if (IsRailDepot(tile)) return false;
    01157       if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
    01158       signal_ctr++;
    01159       if (IsDiagonalTrackdir(trackdir)) {
    01160         signal_ctr++;
    01161         /* Ensure signal_ctr even so X and Y pieces get signals */
    01162         ClrBit(signal_ctr, 0);
    01163       }
    01164       return true;
    01165
    01166     case MP_ROAD:
    01167       if (!IsLevelCrossing(tile)) return false;
    01168       signal_ctr += 2;
    01169       return true;
    01170
    01171     case MP_TUNNELBRIDGE: {
    01172       TileIndex orig_tile = tile; // backup old value
    01173
    01174       if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
    01175       if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
    01176
    01177       /* Skip to end of tunnel or bridge
    01178        * note that tile is a parameter by reference, so it must be updated */
    01179       tile = GetOtherTunnelBridgeEnd(tile);
    01180
    01181       signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
    01182       return true;
    01183     }
    01184
    01185     default: return false;
    01186   }
    01187 }
    01188
    01205 static CommandCost CmdSignalTrackHelper(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01206 {
    01207   CommandCost total_cost(EXPENSES_CONSTRUCTION);
    01208   TileIndex start_tile = tile;
    01209
    01210   Track track = Extract<Track, 0, 3>(p2);
    01211   bool mode = HasBit(p2, 3);
    01212   bool semaphores = HasBit(p2, 4);
    01213   bool remove = HasBit(p2, 5);
    01214   bool autofill = HasBit(p2, 6);
    01215   byte signal_density = GB(p2, 24, 8);
    01216
    01217   if (p1 >= MapSize() || !ValParamTrackOrientation(track)) return CMD_ERROR;
    01218   TileIndex end_tile = p1;
    01219   if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
    01220
    01221   if (!IsPlainRailTile(tile)) return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
    01222
    01223   /* for vertical/horizontal tracks, double the given signals density
    01224    * since the original amount will be too dense (shorter tracks) */
    01225   signal_density *= 2;
    01226
    01227   Trackdir trackdir = TrackToTrackdir(track);
    01228   CommandCost ret = ValidateAutoDrag(&trackdir, tile, end_tile);
    01229   if (ret.Failed()) return ret;
    01230
    01231   track = TrackdirToTrack(trackdir); // trackdir might have changed, keep track in sync
    01232   Trackdir start_trackdir = trackdir;
    01233
    01234   /* Must start on a valid track to be able to avoid loops */
    01235   if (!HasTrack(tile, track)) return CMD_ERROR;
    01236
    01237   SignalType sigtype = (SignalType)GB(p2, 7, 3);
    01238   if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
    01239
    01240   byte signals;
    01241   /* copy the signal-style of the first rail-piece if existing */
    01242   if (HasSignalOnTrack(tile, track)) {
    01243     signals = GetPresentSignals(tile) & SignalOnTrack(track);
    01244     assert(signals != 0);
    01245
    01246     /* copy signal/semaphores style (independent of CTRL) */
    01247     semaphores = GetSignalVariant(tile, track) != SIG_ELECTRIC;
    01248
    01249     sigtype = GetSignalType(tile, track);
    01250     /* Don't but copy entry or exit-signal type */
    01251     if (sigtype == SIGTYPE_ENTRY || sigtype == SIGTYPE_EXIT) sigtype = SIGTYPE_NORMAL;
    01252   } else { // no signals exist, drag a two-way signal stretch
    01253     signals = IsPbsSignal(sigtype) ? SignalAlongTrackdir(trackdir) : SignalOnTrack(track);
    01254   }
    01255
    01256   byte signal_dir = 0;
    01257   if (signals & SignalAlongTrackdir(trackdir))   SetBit(signal_dir, 0);
    01258   if (signals & SignalAgainstTrackdir(trackdir)) SetBit(signal_dir, 1);
    01259
    01260   /* signal_ctr         - amount of tiles already processed
    01261    * signals_density    - setting to put signal on every Nth tile (double space on |, -- tracks)
    01262    **********
    01263    * trackdir   - trackdir to build with autorail
    01264    * semaphores - semaphores or signals
    01265    * signals    - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
    01266    *              and convert all others to semaphore/signal
    01267    * remove     - 1 remove signals, 0 build signals */
    01268   int signal_ctr = 0;
    01269   CommandCost last_error = CMD_ERROR;
    01270   bool had_success = false;
    01271   for (;;) {
    01272     /* only build/remove signals with the specified density */
    01273     if (remove || signal_ctr % signal_density == 0) {
    01274       uint32 p1 = GB(TrackdirToTrack(trackdir), 0, 3);
    01275       SB(p1, 3, 1, mode);
    01276       SB(p1, 4, 1, semaphores);
    01277       SB(p1, 5, 3, sigtype);
    01278       if (!remove && signal_ctr == 0) SetBit(p1, 17);
    01279
    01280       /* Pick the correct orientation for the track direction */
    01281       signals = 0;
    01282       if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
    01283       if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
    01284
    01285       CommandCost ret = DoCommand(tile, p1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
    01286
    01287       /* Be user-friendly and try placing signals as much as possible */
    01288       if (ret.Succeeded()) {
    01289         had_success = true;
    01290         total_cost.AddCost(ret);
    01291       } else {
    01292         /* The "No railway" error is the least important one. */
    01293         if (ret.GetErrorMessage() != STR_ERROR_THERE_IS_NO_RAILROAD_TRACK ||
    01294             last_error.GetErrorMessage() == INVALID_STRING_ID) {
    01295           last_error = ret;
    01296         }
    01297       }
    01298     }
    01299
    01300     if (autofill) {
    01301       if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
    01302
    01303       /* Prevent possible loops */
    01304       if (tile == start_tile && trackdir == start_trackdir) break;
    01305     } else {
    01306       if (tile == end_tile) break;
    01307
    01308       tile += ToTileIndexDiff(_trackdelta[trackdir]);
    01309       signal_ctr++;
    01310
    01311       /* toggle railbit for the non-diagonal tracks (|, -- tracks) */
    01312       if (IsDiagonalTrackdir(trackdir)) {
    01313         signal_ctr++;
    01314       } else {
    01315         ToggleBit(trackdir, 0);
    01316       }
    01317     }
    01318   }
    01319
    01320   return had_success ? total_cost : last_error;
    01321 }
    01322
    01341 CommandCost CmdBuildSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01342 {
    01343   return CmdSignalTrackHelper(tile, flags, p1, p2, text);
    01344 }
    01345
    01358 CommandCost CmdRemoveSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01359 {
    01360   Track track = Extract<Track, 0, 3>(p1);
    01361
    01362   if (!ValParamTrackOrientation(track) || !IsPlainRailTile(tile) || !HasTrack(tile, track)) {
    01363     return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
    01364   }
    01365   if (!HasSignalOnTrack(tile, track)) {
    01366     return_cmd_error(STR_ERROR_THERE_ARE_NO_SIGNALS);
    01367   }
    01368   CommandCost ret = EnsureNoTrainOnTrack(tile, track);
    01369   if (ret.Failed()) return ret;
    01370
    01371   /* Only water can remove signals from anyone */
    01372   if (_current_company != OWNER_WATER) {
    01373     CommandCost ret = CheckTileOwnership(tile);
    01374     if (ret.Failed()) return ret;
    01375   }
    01376
    01377   /* Do it? */
    01378   if (flags & DC_EXEC) {
    01379     Train *v = NULL;
    01380     if (HasReservedTracks(tile, TrackToTrackBits(track))) {
    01381       v = GetTrainForReservation(tile, track);
    01382     } else if (IsPbsSignal(GetSignalType(tile, track))) {
    01383       /* PBS signal, might be the end of a path reservation. */
    01384       Trackdir td = TrackToTrackdir(track);
    01385       for (int i = 0; v == NULL && i < 2; i++, td = ReverseTrackdir(td)) {
    01386         /* Only test the active signal side. */
    01387         if (!HasSignalOnTrackdir(tile, ReverseTrackdir(td))) continue;
    01388         TileIndex next = TileAddByDiagDir(tile, TrackdirToExitdir(td));
    01389         TrackBits tracks = TrackdirBitsToTrackBits(TrackdirReachesTrackdirs(td));
    01390         if (HasReservedTracks(next, tracks)) {
    01391           v = GetTrainForReservation(next, TrackBitsToTrack(GetReservedTrackbits(next) & tracks));
    01392         }
    01393       }
    01394     }
    01395     Company::Get(GetTileOwner(tile))->infrastructure.signal -= CountBits(GetPresentSignals(tile));
    01396     SetPresentSignals(tile, GetPresentSignals(tile) & ~SignalOnTrack(track));
    01397     Company::Get(GetTileOwner(tile))->infrastructure.signal += CountBits(GetPresentSignals(tile));
    01398     DirtyCompanyInfrastructureWindows(GetTileOwner(tile));
    01399
    01400     /* removed last signal from tile? */
    01401     if (GetPresentSignals(tile) == 0) {
    01402       SetSignalStates(tile, 0);
    01403       SetHasSignals(tile, false);
    01404       SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
    01405     }
    01406
    01407     AddTrackToSignalBuffer(tile, track, GetTileOwner(tile));
    01408     YapfNotifyTrackLayoutChange(tile, track);
    01409     if (v != NULL) TryPathReserve(v, false);
    01410
    01411     MarkTileDirtyByTile(tile);
    01412   }
    01413
    01414   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_SIGNALS]);
    01415 }
    01416
    01435 CommandCost CmdRemoveSignalTrack(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01436 {
    01437   return CmdSignalTrackHelper(tile, flags, p1, SetBit(p2, 5), text); // bit 5 is remove bit
    01438 }
    01439
    01441 static Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
    01442 {
    01443   if (v->type != VEH_TRAIN) return NULL;
    01444
    01445   TrainList *affected_trains = static_cast<TrainList*>(data);
    01446   affected_trains->Include(Train::From(v)->First());
    01447
    01448   return NULL;
    01449 }
    01450
    01463 CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    01464 {
    01465   RailType totype = Extract<RailType, 0, 4>(p2);
    01466
    01467   if (!ValParamRailtype(totype)) return CMD_ERROR;
    01468   if (p1 >= MapSize()) return CMD_ERROR;
    01469
    01470   TrainList affected_trains;
    01471
    01472   CommandCost cost(EXPENSES_CONSTRUCTION);
    01473   CommandCost error = CommandCost(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK); // by default, there is no track to convert.
    01474   TileArea ta(tile, p1);
    01475   TileIterator *iter = HasBit(p2, 4) ? (TileIterator *)new DiagonalTileIterator(tile, p1) : new OrthogonalTileIterator(ta);
    01476   for (; (tile = *iter) != INVALID_TILE; ++(*iter)) {
    01477     TileType tt = GetTileType(tile);
    01478
    01479     /* Check if there is any track on tile */
    01480     switch (tt) {
    01481       case MP_RAILWAY:
    01482         break;
    01483       case MP_STATION:
    01484         if (!HasStationRail(tile)) continue;
    01485         break;
    01486       case MP_ROAD:
    01487         if (!IsLevelCrossing(tile)) continue;
    01488         if (RailNoLevelCrossings(totype)) {
    01489           error.MakeError(STR_ERROR_CROSSING_DISALLOWED);
    01490           continue;
    01491         }
    01492         break;
    01493       case MP_TUNNELBRIDGE:
    01494         if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
    01495         break;
    01496       default: continue;
    01497     }
    01498
    01499     /* Original railtype we are converting from */
    01500     RailType type = GetRailType(tile);
    01501
    01502     /* Converting to the same type or converting 'hidden' elrail -> rail */
    01503     if (type == totype || (_settings_game.vehicle.disable_elrails && totype == RAILTYPE_RAIL && type == RAILTYPE_ELECTRIC)) continue;
    01504
    01505     /* Trying to convert other's rail */
    01506     CommandCost ret = CheckTileOwnership(tile);
    01507     if (ret.Failed()) {
    01508       error = ret;
    01509       continue;
    01510     }
    01511
    01512     SmallVector<Train *, 2> vehicles_affected;
    01513
    01514     /* Vehicle on the tile when not converting Rail <-> ElRail
    01515      * Tunnels and bridges have special check later */
    01516     if (tt != MP_TUNNELBRIDGE) {
    01517       if (!IsCompatibleRail(type, totype)) {
    01518         CommandCost ret = EnsureNoVehicleOnGround(tile);
    01519         if (ret.Failed()) {
    01520           error = ret;
    01521           continue;
    01522         }
    01523       }
    01524       if (flags & DC_EXEC) { // we can safely convert, too
    01525         TrackBits reserved = GetReservedTrackbits(tile);
    01526         Track     track;
    01527         while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
    01528           Train *v = GetTrainForReservation(tile, track);
    01529           if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
    01530             /* No power on new rail type, reroute. */
    01531             FreeTrainTrackReservation(v);
    01532             *vehicles_affected.Append() = v;
    01533           }
    01534         }
    01535
    01536         /* Update the company infrastructure counters. */
    01537         if (!IsRailStationTile(tile) || !IsStationTileBlocked(tile)) {
    01538           Company *c = Company::Get(GetTileOwner(tile));
    01539           uint num_pieces = IsLevelCrossingTile(tile) ? LEVELCROSSING_TRACKBIT_FACTOR : 1;
    01540           if (IsPlainRailTile(tile)) {
    01541             TrackBits bits = GetTrackBits(tile);
    01542             num_pieces = CountBits(bits);
    01543             if (TracksOverlap(bits)) num_pieces *= num_pieces;
    01544           }
    01545           c->infrastructure.rail[type] -= num_pieces;
    01546           c->infrastructure.rail[totype] += num_pieces;
    01547           DirtyCompanyInfrastructureWindows(c->index);
    01548         }
    01549
    01550         SetRailType(tile, totype);
    01551         MarkTileDirtyByTile(tile);
    01552         /* update power of train on this tile */
    01553         FindVehicleOnPos(tile, &affected_trains, &UpdateTrainPowerProc);
    01554       }
    01555     }
    01556
    01557     switch (tt) {
    01558       case MP_RAILWAY:
    01559         switch (GetRailTileType(tile)) {
    01560           case RAIL_TILE_DEPOT:
    01561             if (flags & DC_EXEC) {
    01562               /* notify YAPF about the track layout change */
    01563               YapfNotifyTrackLayoutChange(tile, GetRailDepotTrack(tile));
    01564
    01565               /* Update build vehicle window related to this depot */
    01566               InvalidateWindowData(WC_VEHICLE_DEPOT, tile);
    01567               InvalidateWindowData(WC_BUILD_VEHICLE, tile);
    01568             }
    01569             cost.AddCost(RailConvertCost(type, totype));
    01570             break;
    01571
    01572           default: // RAIL_TILE_NORMAL, RAIL_TILE_SIGNALS
    01573             if (flags & DC_EXEC) {
    01574               /* notify YAPF about the track layout change */
    01575               TrackBits tracks = GetTrackBits(tile);
    01576               while (tracks != TRACK_BIT_NONE) {
    01577                 YapfNotifyTrackLayoutChange(tile, RemoveFirstTrack(&tracks));
    01578               }
    01579             }
    01580             cost.AddCost(RailConvertCost(type, totype) * CountBits(GetTrackBits(tile)));
    01581             break;
    01582         }
    01583         break;
    01584
    01585       case MP_TUNNELBRIDGE: {
    01586         TileIndex endtile = GetOtherTunnelBridgeEnd(tile);
    01587
    01588         /* If both ends of tunnel/bridge are in the range, do not try to convert twice -
    01589          * it would cause assert because of different test and exec runs */
    01590         if (endtile < tile && TileX(endtile) >= TileX(ta.tile) && TileX(endtile) < TileX(ta.tile) + ta.w &&
    01591             TileY(endtile) >= TileY(ta.tile) && TileY(endtile) < TileY(ta.tile) + ta.h) continue;
    01592
    01593         /* When not coverting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
    01594         if (!IsCompatibleRail(GetRailType(tile), totype)) {
    01595           CommandCost ret = TunnelBridgeIsFree(tile, endtile);
    01596           if (ret.Failed()) {
    01597             error = ret;
    01598             continue;
    01599           }
    01600         }
    01601
    01602         if (flags & DC_EXEC) {
    01603           Track track = DiagDirToDiagTrack(GetTunnelBridgeDirection(tile));
    01604           if (HasTunnelBridgeReservation(tile)) {
    01605             Train *v = GetTrainForReservation(tile, track);
    01606             if (v != NULL && !HasPowerOnRail(v->railtype, totype)) {
    01607               /* No power on new rail type, reroute. */
    01608               FreeTrainTrackReservation(v);
    01609               *vehicles_affected.Append() = v;
    01610             }
    01611           }
    01612
    01613           /* Update the company infrastructure counters. */
    01614           uint num_pieces = (GetTunnelBridgeLength(tile, endtile) + 2) * TUNNELBRIDGE_TRACKBIT_FACTOR;
    01615           Company *c = Company::Get(GetTileOwner(tile));
    01616           c->infrastructure.rail[GetRailType(tile)] -= num_pieces;
    01617           c->infrastructure.rail[totype] += num_pieces;
    01618           DirtyCompanyInfrastructureWindows(c->index);
    01619
    01620           SetRailType(tile, totype);
    01621           SetRailType(endtile, totype);
    01622
    01623           FindVehicleOnPos(tile, &affected_trains, &UpdateTrainPowerProc);
    01624           FindVehicleOnPos(endtile, &affected_trains, &UpdateTrainPowerProc);
    01625
    01626           YapfNotifyTrackLayoutChange(tile, track);
    01627           YapfNotifyTrackLayoutChange(endtile, track);
    01628
    01629           MarkTileDirtyByTile(tile);
    01630           MarkTileDirtyByTile(endtile);
    01631
    01632           if (IsBridge(tile)) {
    01633             TileIndexDiff delta = TileOffsByDiagDir(GetTunnelBridgeDirection(tile));
    01634             TileIndex t = tile + delta;
    01635             for (; t != endtile; t += delta) MarkTileDirtyByTile(t); // TODO encapsulate this into a function
    01636           }
    01637         }
    01638
    01639         cost.AddCost((GetTunnelBridgeLength(tile, endtile) + 2) * RailConvertCost(type, totype));
    01640         break;
    01641       }
    01642
    01643       default: // MP_STATION, MP_ROAD
    01644         if (flags & DC_EXEC) {
    01645           Track track = ((tt == MP_STATION) ? GetRailStationTrack(tile) : GetCrossingRailTrack(tile));
    01646           YapfNotifyTrackLayoutChange(tile, track);
    01647         }
    01648
    01649         cost.AddCost(RailConvertCost(type, totype));
    01650         break;
    01651     }
    01652
    01653     for (uint i = 0; i < vehicles_affected.Length(); ++i) {
    01654       TryPathReserve(vehicles_affected[i], true);
    01655     }
    01656   }
    01657
    01658   if (flags & DC_EXEC) {
    01659     /* Railtype changed, update trains as when entering different track */
    01660     for (Train **v = affected_trains.Begin(); v != affected_trains.End(); v++) {
    01661       (*v)->ConsistChanged(true);
    01662     }
    01663   }
    01664
    01665   delete iter;
    01666   return (cost.GetCost() == 0) ? error : cost;
    01667 }
    01668
    01669 static CommandCost RemoveTrainDepot(TileIndex tile, DoCommandFlag flags)
    01670 {
    01671   if (_current_company != OWNER_WATER) {
    01672     CommandCost ret = CheckTileOwnership(tile);
    01673     if (ret.Failed()) return ret;
    01674   }
    01675
    01676   CommandCost ret = EnsureNoVehicleOnGround(tile);
    01677   if (ret.Failed()) return ret;
    01678
    01679   if (flags & DC_EXEC) {
    01680     /* read variables before the depot is removed */
    01681     DiagDirection dir = GetRailDepotDirection(tile);
    01682     Owner owner = GetTileOwner(tile);
    01683     Train *v = NULL;
    01684
    01685     if (HasDepotReservation(tile)) {
    01686       v = GetTrainForReservation(tile, DiagDirToDiagTrack(dir));
    01687       if (v != NULL) FreeTrainTrackReservation(v);
    01688     }
    01689
    01690     Company::Get(owner)->infrastructure.rail[GetRailType(tile)]--;
    01691     DirtyCompanyInfrastructureWindows(owner);
    01692
    01693     delete Depot::GetByTile(tile);
    01694     DoClearSquare(tile);
    01695     AddSideToSignalBuffer(tile, dir, owner);
    01696     YapfNotifyTrackLayoutChange(tile, DiagDirToDiagTrack(dir));
    01697     if (v != NULL) TryPathReserve(v, true);
    01698   }
    01699
    01700   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_TRAIN]);
    01701 }
    01702
    01703 static CommandCost ClearTile_Track(TileIndex tile, DoCommandFlag flags)
    01704 {
    01705   CommandCost cost(EXPENSES_CONSTRUCTION);
    01706
    01707   if (flags & DC_AUTO) {
    01708     if (!IsTileOwner(tile, _current_company)) {
    01709       return_cmd_error(STR_ERROR_AREA_IS_OWNED_BY_ANOTHER);
    01710     }
    01711
    01712     if (IsPlainRail(tile)) {
    01713       return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
    01714     } else {
    01715       return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
    01716     }
    01717   }
    01718
    01719   switch (GetRailTileType(tile)) {
    01720     case RAIL_TILE_SIGNALS:
    01721     case RAIL_TILE_NORMAL: {
    01722       Slope tileh = GetTileSlope(tile);
    01723       /* Is there flat water on the lower halftile that gets cleared expensively? */
    01724       bool water_ground = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh));
    01725
    01726       TrackBits tracks = GetTrackBits(tile);
    01727       while (tracks != TRACK_BIT_NONE) {
    01728         Track track = RemoveFirstTrack(&tracks);
    01729         CommandCost ret = DoCommand(tile, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
    01730         if (ret.Failed()) return ret;
    01731         cost.AddCost(ret);
    01732       }
    01733
    01734       /* when bankrupting, don't make water dirty, there could be a ship on lower halftile */
    01735       if (water_ground && !(flags & DC_BANKRUPT)) {
    01736         CommandCost ret = EnsureNoVehicleOnGround(tile);
    01737         if (ret.Failed()) return ret;
    01738
    01739         /* The track was removed, and left a coast tile. Now also clear the water. */
    01740         if (flags & DC_EXEC) DoClearSquare(tile);
    01741         cost.AddCost(_price[PR_CLEAR_WATER]);
    01742       }
    01743
    01744       return cost;
    01745     }
    01746
    01747     case RAIL_TILE_DEPOT:
    01748       return RemoveTrainDepot(tile, flags);
    01749
    01750     default:
    01751       return CMD_ERROR;
    01752   }
    01753 }
    01754
    01759 static uint GetSaveSlopeZ(uint x, uint y, Track track)
    01760 {
    01761   switch (track) {
    01762     case TRACK_UPPER: x &= ~0xF; y &= ~0xF; break;
    01763     case TRACK_LOWER: x |=  0xF; y |=  0xF; break;
    01764     case TRACK_LEFT:  x |=  0xF; y &= ~0xF; break;
    01765     case TRACK_RIGHT: x &= ~0xF; y |=  0xF; break;
    01766     default: break;
    01767   }
    01768   return GetSlopePixelZ(x, y);
    01769 }
    01770
    01771 static void DrawSingleSignal(TileIndex tile, Track track, byte condition, uint image, uint pos)
    01772 {
    01773   bool side = (_settings_game.vehicle.road_side != 0) && _settings_game.construction.signal_side;
    01774   static const Point SignalPositions[2][12] = {
    01775     { // Signals on the left side
    01776     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01777       { 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
    01778     /*  LOWER     LOWER     X         X         Y         Y     */
    01779       {11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
    01780     }, { // Signals on the right side
    01781     /*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
    01782       {14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
    01783     /*  LOWER     LOWER     X         X         Y         Y     */
    01784       {14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
    01785     }
    01786   };
    01787
    01788   uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
    01789   uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
    01790
    01791   SpriteID sprite;
    01792
    01793   SignalType type       = GetSignalType(tile, track);
    01794   SignalVariant variant = GetSignalVariant(tile, track);
    01795
    01796   if (type == SIGTYPE_NORMAL && variant == SIG_ELECTRIC) {
    01797     /* Normal electric signals are picked from original sprites. */
    01798     sprite = SPR_ORIGINAL_SIGNALS_BASE + image + condition;
    01799   } else {
    01800     /* All other signals are picked from add on sprites. */
    01801     sprite = SPR_SIGNALS_BASE + (type - 1) * 16 + variant * 64 + image + condition + (type > SIGTYPE_LAST_NOPBS ? 64 : 0);
    01802   }
    01803
    01804   AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, GetSaveSlopeZ(x, y, track));
    01805 }
    01806
    01807 static uint32 _drawtile_track_palette;
    01808
    01809
    01810 static void DrawTrackFence_NW(const TileInfo *ti, SpriteID base_image)
    01811 {
    01812   RailFenceOffset rfo = RFO_FLAT_X;
    01813   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
    01814   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01815     ti->x, ti->y + 1, 16, 1, 4, ti->z);
    01816 }
    01817
    01818 static void DrawTrackFence_SE(const TileInfo *ti, SpriteID base_image)
    01819 {
    01820   RailFenceOffset rfo = RFO_FLAT_X;
    01821   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SW : RFO_SLOPE_NE;
    01822   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01823     ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
    01824 }
    01825
    01826 static void DrawTrackFence_NW_SE(const TileInfo *ti, SpriteID base_image)
    01827 {
    01828   DrawTrackFence_NW(ti, base_image);
    01829   DrawTrackFence_SE(ti, base_image);
    01830 }
    01831
    01832 static void DrawTrackFence_NE(const TileInfo *ti, SpriteID base_image)
    01833 {
    01834   RailFenceOffset rfo = RFO_FLAT_Y;
    01835   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
    01836   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01837     ti->x + 1, ti->y, 1, 16, 4, ti->z);
    01838 }
    01839
    01840 static void DrawTrackFence_SW(const TileInfo *ti, SpriteID base_image)
    01841 {
    01842   RailFenceOffset rfo = RFO_FLAT_Y;
    01843   if (ti->tileh != SLOPE_FLAT) rfo = (ti->tileh & SLOPE_S) ? RFO_SLOPE_SE : RFO_SLOPE_NW;
    01844   AddSortableSpriteToDraw(base_image + rfo, _drawtile_track_palette,
    01845     ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
    01846 }
    01847
    01848 static void DrawTrackFence_NE_SW(const TileInfo *ti, SpriteID base_image)
    01849 {
    01850   DrawTrackFence_NE(ti, base_image);
    01851   DrawTrackFence_SW(ti, base_image);
    01852 }
    01853
    01857 static void DrawTrackFence_NS_1(const TileInfo *ti, SpriteID base_image)
    01858 {
    01859   int z = ti->z + GetSlopePixelZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_W);
    01860   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
    01861     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01862 }
    01863
    01867 static void DrawTrackFence_NS_2(const TileInfo *ti, SpriteID base_image)
    01868 {
    01869   int z = ti->z + GetSlopePixelZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_E);
    01870   AddSortableSpriteToDraw(base_image + RFO_FLAT_VERT, _drawtile_track_palette,
    01871     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01872 }
    01873
    01877 static void DrawTrackFence_WE_1(const TileInfo *ti, SpriteID base_image)
    01878 {
    01879   int z = ti->z + GetSlopePixelZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_N);
    01880   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
    01881     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01882 }
    01883
    01887 static void DrawTrackFence_WE_2(const TileInfo *ti, SpriteID base_image)
    01888 {
    01889   int z = ti->z + GetSlopePixelZInCorner(RemoveHalftileSlope(ti->tileh), CORNER_S);
    01890   AddSortableSpriteToDraw(base_image + RFO_FLAT_HORZ, _drawtile_track_palette,
    01891     ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
    01892 }
    01893
    01894
    01895 static void DrawTrackDetails(const TileInfo *ti, const RailtypeInfo *rti)
    01896 {
    01897   /* Base sprite for track fences.
    01898    * Note: Halftile slopes only have fences on the upper part. */
    01899   SpriteID base_image = GetCustomRailSprite(rti, ti->tile, RTSG_FENCES, IsHalftileSlope(ti->tileh) ? TCX_UPPER_HALFTILE : TCX_NORMAL);
    01900   if (base_image == 0) base_image = SPR_TRACK_FENCE_FLAT_X;
    01901
    01902   switch (GetRailGroundType(ti->tile)) {
    01903     case RAIL_GROUND_FENCE_NW:     DrawTrackFence_NW(ti, base_image);    break;
    01904     case RAIL_GROUND_FENCE_SE:     DrawTrackFence_SE(ti, base_image);    break;
    01905     case RAIL_GROUND_FENCE_SENW:   DrawTrackFence_NW_SE(ti, base_image); break;
    01906     case RAIL_GROUND_FENCE_NE:     DrawTrackFence_NE(ti, base_image);    break;
    01907     case RAIL_GROUND_FENCE_SW:     DrawTrackFence_SW(ti, base_image);    break;
    01908     case RAIL_GROUND_FENCE_NESW:   DrawTrackFence_NE_SW(ti, base_image); break;
    01909     case RAIL_GROUND_FENCE_VERT1:  DrawTrackFence_NS_1(ti, base_image);  break;
    01910     case RAIL_GROUND_FENCE_VERT2:  DrawTrackFence_NS_2(ti, base_image);  break;
    01911     case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti, base_image);  break;
    01912     case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti, base_image);  break;
    01913     case RAIL_GROUND_WATER: {
    01914       Corner track_corner;
    01915       if (IsHalftileSlope(ti->tileh)) {
    01916         /* Steep slope or one-corner-raised slope with halftile foundation */
    01917         track_corner = GetHalftileSlopeCorner(ti->tileh);
    01918       } else {
    01919         /* Three-corner-raised slope */
    01920         track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    01921       }
    01922       switch (track_corner) {
    01923         case CORNER_W: DrawTrackFence_NS_1(ti, base_image); break;
    01924         case CORNER_S: DrawTrackFence_WE_2(ti, base_image); break;
    01925         case CORNER_E: DrawTrackFence_NS_2(ti, base_image); break;
    01926         case CORNER_N: DrawTrackFence_WE_1(ti, base_image); break;
    01927         default: NOT_REACHED();
    01928       }
    01929       break;
    01930     }
    01931     default: break;
    01932   }
    01933 }
    01934
    01935 /* SubSprite for drawing the track halftile of 'three-corners-raised'-sloped rail sprites. */
    01936 static const int INF = 1000; // big number compared to tilesprite size
    01937 static const SubSprite _halftile_sub_sprite[4] = {
    01938   { -INF    , -INF  , 32 - 33, INF     }, // CORNER_W, clip 33 pixels from right
    01939   { -INF    ,  0 + 7, INF    , INF     }, // CORNER_S, clip 7 pixels from top
    01940   { -31 + 33, -INF  , INF    , INF     }, // CORNER_E, clip 33 pixels from left
    01941   { -INF    , -INF  , INF    , 30 - 23 }  // CORNER_N, clip 23 pixels from bottom
    01942 };
    01943
    01944 static inline void DrawTrackSprite(SpriteID sprite, PaletteID pal, const TileInfo *ti, Slope s)
    01945 {
    01946   DrawGroundSprite(sprite, pal, NULL, 0, (ti->tileh & s) ? -8 : 0);
    01947 }
    01948
    01949 static void DrawTrackBitsOverlay(TileInfo *ti, TrackBits track, const RailtypeInfo *rti)
    01950 {
    01951   RailGroundType rgt = GetRailGroundType(ti->tile);
    01952   Foundation f = GetRailFoundation(ti->tileh, track);
    01953   Corner halftile_corner = CORNER_INVALID;
    01954
    01955   if (IsNonContinuousFoundation(f)) {
    01956     /* Save halftile corner */
    01957     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
    01958     /* Draw lower part first */
    01959     track &= ~CornerToTrackBits(halftile_corner);
    01960     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
    01961   }
    01962
    01963   DrawFoundation(ti, f);
    01964   /* DrawFoundation modifies ti */
    01965
    01966   /* Draw ground */
    01967   if (rgt == RAIL_GROUND_WATER) {
    01968     if (track != TRACK_BIT_NONE || IsSteepSlope(ti->tileh)) {
    01969       /* three-corner-raised slope or steep slope with track on upper part */
    01970       DrawShoreTile(ti->tileh);
    01971     } else {
    01972       /* single-corner-raised slope with track on upper part */
    01973       DrawGroundSprite(SPR_FLAT_WATER_TILE, PAL_NONE);
    01974     }
    01975   } else {
    01976     SpriteID image;
    01977
    01978     switch (rgt) {
    01979       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    01980       case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
    01981       default:                     image = SPR_FLAT_GRASS_TILE; break;
    01982     }
    01983
    01984     image += SlopeToSpriteOffset(ti->tileh);
    01985
    01986     DrawGroundSprite(image, PAL_NONE);
    01987   }
    01988
    01989   SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
    01990   SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
    01991   TrackBits pbs = _settings_client.gui.show_track_reservation ? GetRailReservationTrackBits(ti->tile) : TRACK_BIT_NONE;
    01992
    01993   if (track == TRACK_BIT_NONE) {
    01994     /* Half-tile foundation, no track here? */
    01995   } else if (ti->tileh == SLOPE_NW && track == TRACK_BIT_Y) {
    01996     DrawGroundSprite(ground + RTO_SLOPE_NW, PAL_NONE);
    01997     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 9, PALETTE_CRASH);
    01998   } else if (ti->tileh == SLOPE_NE && track == TRACK_BIT_X) {
    01999     DrawGroundSprite(ground + RTO_SLOPE_NE, PAL_NONE);
    02000     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 6, PALETTE_CRASH);
    02001   } else if (ti->tileh == SLOPE_SE && track == TRACK_BIT_Y) {
    02002     DrawGroundSprite(ground + RTO_SLOPE_SE, PAL_NONE);
    02003     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 7, PALETTE_CRASH);
    02004   } else if (ti->tileh == SLOPE_SW && track == TRACK_BIT_X) {
    02005     DrawGroundSprite(ground + RTO_SLOPE_SW, PAL_NONE);
    02006     if (pbs != TRACK_BIT_NONE) DrawGroundSprite(overlay + 8, PALETTE_CRASH);
    02007   } else {
    02008     switch (track) {
    02009       /* Draw single ground sprite when not overlapping. No track overlay
    02010        * is necessary for these sprites. */
    02011       case TRACK_BIT_X:     DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
    02012       case TRACK_BIT_Y:     DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
    02013       case TRACK_BIT_UPPER: DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N); break;
    02014       case TRACK_BIT_LOWER: DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
    02015       case TRACK_BIT_RIGHT: DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E); break;
    02016       case TRACK_BIT_LEFT:  DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
    02017       case TRACK_BIT_CROSS: DrawGroundSprite(ground + RTO_CROSSING_XY, PAL_NONE); break;
    02018       case TRACK_BIT_HORZ:  DrawTrackSprite(ground + RTO_N, PAL_NONE, ti, SLOPE_N);
    02019                             DrawTrackSprite(ground + RTO_S, PAL_NONE, ti, SLOPE_S); break;
    02020       case TRACK_BIT_VERT:  DrawTrackSprite(ground + RTO_E, PAL_NONE, ti, SLOPE_E);
    02021                             DrawTrackSprite(ground + RTO_W, PAL_NONE, ti, SLOPE_W); break;
    02022
    02023       default:
    02024         /* We're drawing a junction tile */
    02025         if ((track & TRACK_BIT_3WAY_NE) == 0) {
    02026           DrawGroundSprite(ground + RTO_JUNCTION_SW, PAL_NONE);
    02027         } else if ((track & TRACK_BIT_3WAY_SW) == 0) {
    02028           DrawGroundSprite(ground + RTO_JUNCTION_NE, PAL_NONE);
    02029         } else if ((track & TRACK_BIT_3WAY_NW) == 0) {
    02030           DrawGroundSprite(ground + RTO_JUNCTION_SE, PAL_NONE);
    02031         } else if ((track & TRACK_BIT_3WAY_SE) == 0) {
    02032           DrawGroundSprite(ground + RTO_JUNCTION_NW, PAL_NONE);
    02033         } else {
    02034           DrawGroundSprite(ground + RTO_JUNCTION_NSEW, PAL_NONE);
    02035         }
    02036
    02037         /* Mask out PBS bits as we shall draw them afterwards anyway. */
    02038         track &= ~pbs;
    02039
    02040         /* Draw regular track bits */
    02041         if (track & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PAL_NONE);
    02042         if (track & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PAL_NONE);
    02043         if (track & TRACK_BIT_UPPER) DrawGroundSprite(overlay + RTO_N, PAL_NONE);
    02044         if (track & TRACK_BIT_LOWER) DrawGroundSprite(overlay + RTO_S, PAL_NONE);
    02045         if (track & TRACK_BIT_RIGHT) DrawGroundSprite(overlay + RTO_E, PAL_NONE);
    02046         if (track & TRACK_BIT_LEFT)  DrawGroundSprite(overlay + RTO_W, PAL_NONE);
    02047     }
    02048
    02049     /* Draw reserved track bits */
    02050     if (pbs & TRACK_BIT_X)     DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH);
    02051     if (pbs & TRACK_BIT_Y)     DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH);
    02052     if (pbs & TRACK_BIT_UPPER) DrawTrackSprite(overlay + RTO_N, PALETTE_CRASH, ti, SLOPE_N);
    02053     if (pbs & TRACK_BIT_LOWER) DrawTrackSprite(overlay + RTO_S, PALETTE_CRASH, ti, SLOPE_S);
    02054     if (pbs & TRACK_BIT_RIGHT) DrawTrackSprite(overlay + RTO_E, PALETTE_CRASH, ti, SLOPE_E);
    02055     if (pbs & TRACK_BIT_LEFT)  DrawTrackSprite(overlay + RTO_W, PALETTE_CRASH, ti, SLOPE_W);
    02056   }
    02057
    02058   if (IsValidCorner(halftile_corner)) {
    02059     DrawFoundation(ti, HalftileFoundation(halftile_corner));
    02060     overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY, TCX_UPPER_HALFTILE);
    02061     ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND, TCX_UPPER_HALFTILE);
    02062
    02063     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
    02064     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    02065
    02066     SpriteID image;
    02067     switch (rgt) {
    02068       case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    02069       case RAIL_GROUND_ICE_DESERT:
    02070       case RAIL_GROUND_HALF_SNOW:  image = SPR_FLAT_SNOW_DESERT_TILE; break;
    02071       default:                     image = SPR_FLAT_GRASS_TILE; break;
    02072     }
    02073
    02074     image += SlopeToSpriteOffset(fake_slope);
    02075
    02076     DrawGroundSprite(image, PAL_NONE, &(_halftile_sub_sprite[halftile_corner]));
    02077
    02078     track = CornerToTrackBits(halftile_corner);
    02079
    02080     int offset;
    02081     switch (track) {
    02082       default: NOT_REACHED();
    02083       case TRACK_BIT_UPPER: offset = RTO_N; break;
    02084       case TRACK_BIT_LOWER: offset = RTO_S; break;
    02085       case TRACK_BIT_RIGHT: offset = RTO_E; break;
    02086       case TRACK_BIT_LEFT:  offset = RTO_W; break;
    02087     }
    02088
    02089     DrawTrackSprite(ground + offset, PAL_NONE, ti, fake_slope);
    02090     if (_settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, track)) {
    02091       DrawTrackSprite(overlay + offset, PALETTE_CRASH, ti, fake_slope);
    02092     }
    02093   }
    02094 }
    02095
    02101 static void DrawTrackBits(TileInfo *ti, TrackBits track)
    02102 {
    02103   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    02104
    02105   if (rti->UsesOverlay()) {
    02106     DrawTrackBitsOverlay(ti, track, rti);
    02107     return;
    02108   }
    02109
    02110   RailGroundType rgt = GetRailGroundType(ti->tile);
    02111   Foundation f = GetRailFoundation(ti->tileh, track);
    02112   Corner halftile_corner = CORNER_INVALID;
    02113
    02114   if (IsNonContinuousFoundation(f)) {
    02115     /* Save halftile corner */
    02116     halftile_corner = (f == FOUNDATION_STEEP_BOTH ? GetHighestSlopeCorner(ti->tileh) : GetHalftileFoundationCorner(f));
    02117     /* Draw lower part first */
    02118     track &= ~CornerToTrackBits(halftile_corner);
    02119     f = (f == FOUNDATION_STEEP_BOTH ? FOUNDATION_STEEP_LOWER : FOUNDATION_NONE);
    02120   }
    02121
    02122   DrawFoundation(ti, f);
    02123   /* DrawFoundation modifies ti */
    02124
    02125   SpriteID image;
    02126   PaletteID pal = PAL_NONE;
    02127   const SubSprite *sub = NULL;
    02128   bool junction = false;
    02129
    02130   /* Select the sprite to use. */
    02131   if (track == 0) {
    02132     /* Clear ground (only track on halftile foundation) */
    02133     if (rgt == RAIL_GROUND_WATER) {
    02134       if (IsSteepSlope(ti->tileh)) {
    02135         DrawShoreTile(ti->tileh);
    02136         image = 0;
    02137       } else {
    02138         image = SPR_FLAT_WATER_TILE;
    02139       }
    02140     } else {
    02141       switch (rgt) {
    02142         case RAIL_GROUND_BARREN:     image = SPR_FLAT_BARE_LAND;  break;
    02143         case RAIL_GROUND_ICE_DESERT: image = SPR_FLAT_SNOW_DESERT_TILE; break;
    02144         default:                     image = SPR_FLAT_GRASS_TILE; break;
    02145       }
    02146       image += SlopeToSpriteOffset(ti->tileh);
    02147     }
    02148   } else {
    02149     if (ti->tileh != SLOPE_FLAT) {
    02150       /* track on non-flat ground */
    02151       image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
    02152     } else {
    02153       /* track on flat ground */
    02154       (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
    02155       (image++,                           track == TRACK_BIT_X) ||
    02156       (image++,                           track == TRACK_BIT_UPPER) ||
    02157       (image++,                           track == TRACK_BIT_LOWER) ||
    02158       (image++,                           track == TRACK_BIT_RIGHT) ||
    02159       (image++,                           track == TRACK_BIT_LEFT) ||
    02160       (image++,                           track == TRACK_BIT_CROSS) ||
    02161
    02162       (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
    02163       (image++,                            track == TRACK_BIT_VERT) ||
    02164
    02165       (junction = true, false) ||
    02166       (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
    02167       (image++,                          (track & TRACK_BIT_3WAY_SW) == 0) ||
    02168       (image++,                          (track & TRACK_BIT_3WAY_NW) == 0) ||
    02169       (image++,                          (track & TRACK_BIT_3WAY_SE) == 0) ||
    02170       (image++, true);
    02171     }
    02172
    02173     switch (rgt) {
    02174       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    02175       case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset;  break;
    02176       case RAIL_GROUND_WATER: {
    02177         /* three-corner-raised slope */
    02178         DrawShoreTile(ti->tileh);
    02179         Corner track_corner = OppositeCorner(GetHighestSlopeCorner(ComplementSlope(ti->tileh)));
    02180         sub = &(_halftile_sub_sprite[track_corner]);
    02181         break;
    02182       }
    02183       default: break;
    02184     }
    02185   }
    02186
    02187   if (image != 0) DrawGroundSprite(image, pal, sub);
    02188
    02189   /* Draw track pieces individually for junction tiles */
    02190   if (junction) {
    02191     if (track & TRACK_BIT_X)     DrawGroundSprite(rti->base_sprites.single_x, PAL_NONE);
    02192     if (track & TRACK_BIT_Y)     DrawGroundSprite(rti->base_sprites.single_y, PAL_NONE);
    02193     if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PAL_NONE);
    02194     if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PAL_NONE);
    02195     if (track & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PAL_NONE);
    02196     if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PAL_NONE);
    02197   }
    02198
    02199   /* PBS debugging, draw reserved tracks darker */
    02200   if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation) {
    02201     /* Get reservation, but mask track on halftile slope */
    02202     TrackBits pbs = GetRailReservationTrackBits(ti->tile) & track;
    02203     if (pbs & TRACK_BIT_X) {
    02204       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
    02205         DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH);
    02206       } else {
    02207         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
    02208       }
    02209     }
    02210     if (pbs & TRACK_BIT_Y) {
    02211       if (ti->tileh == SLOPE_FLAT || ti->tileh == SLOPE_ELEVATED) {
    02212         DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH);
    02213       } else {
    02214         DrawGroundSprite(_track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.single_sloped - 20, PALETTE_CRASH);
    02215       }
    02216     }
    02217     if (pbs & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_N ? -(int)TILE_HEIGHT : 0);
    02218     if (pbs & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_S ? -(int)TILE_HEIGHT : 0);
    02219     if (pbs & TRACK_BIT_LEFT)  DrawGroundSprite(rti->base_sprites.single_w, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_W ? -(int)TILE_HEIGHT : 0);
    02220     if (pbs & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e, PALETTE_CRASH, NULL, 0, ti->tileh & SLOPE_E ? -(int)TILE_HEIGHT : 0);
    02221   }
    02222
    02223   if (IsValidCorner(halftile_corner)) {
    02224     DrawFoundation(ti, HalftileFoundation(halftile_corner));
    02225
    02226     /* Draw higher halftile-overlay: Use the sloped sprites with three corners raised. They probably best fit the lightning. */
    02227     Slope fake_slope = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    02228     image = _track_sloped_sprites[fake_slope - 1] + rti->base_sprites.track_y;
    02229     pal = PAL_NONE;
    02230     switch (rgt) {
    02231       case RAIL_GROUND_BARREN:     pal = PALETTE_TO_BARE_LAND; break;
    02232       case RAIL_GROUND_ICE_DESERT:
    02233       case RAIL_GROUND_HALF_SNOW:  image += rti->snow_offset;  break; // higher part has snow in this case too
    02234       default: break;
    02235     }
    02236     DrawGroundSprite(image, pal, &(_halftile_sub_sprite[halftile_corner]));
    02237
    02238     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasReservedTracks(ti->tile, CornerToTrackBits(halftile_corner))) {
    02239       static const byte _corner_to_track_sprite[] = {3, 1, 2, 0};
    02240       DrawGroundSprite(_corner_to_track_sprite[halftile_corner] + rti->base_sprites.single_n, PALETTE_CRASH, NULL, 0, -(int)TILE_HEIGHT);
    02241     }
    02242   }
    02243 }
    02244
    02252 enum SignalOffsets {
    02253   SIGNAL_TO_SOUTHWEST =  0,
    02254   SIGNAL_TO_NORTHEAST =  2,
    02255   SIGNAL_TO_SOUTHEAST =  4,
    02256   SIGNAL_TO_NORTHWEST =  6,
    02257   SIGNAL_TO_EAST      =  8,
    02258   SIGNAL_TO_WEST      = 10,
    02259   SIGNAL_TO_SOUTH     = 12,
    02260   SIGNAL_TO_NORTH     = 14,
    02261 };
    02262
    02263 static void DrawSignals(TileIndex tile, TrackBits rails)
    02264 {
    02265 #define MAYBE_DRAW_SIGNAL(x, y, z, t) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, t, GetSingleSignalState(tile, x), y, z)
    02266
    02267   if (!(rails & TRACK_BIT_Y)) {
    02268     if (!(rails & TRACK_BIT_X)) {
    02269       if (rails & TRACK_BIT_LEFT) {
    02270         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTH, 0, TRACK_LEFT);
    02271         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTH, 1, TRACK_LEFT);
    02272       }
    02273       if (rails & TRACK_BIT_RIGHT) {
    02274         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_NORTH, 2, TRACK_RIGHT);
    02275         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_SOUTH, 3, TRACK_RIGHT);
    02276       }
    02277       if (rails & TRACK_BIT_UPPER) {
    02278         MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_WEST, 4, TRACK_UPPER);
    02279         MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_EAST, 5, TRACK_UPPER);
    02280       }
    02281       if (rails & TRACK_BIT_LOWER) {
    02282         MAYBE_DRAW_SIGNAL(1, SIGNAL_TO_WEST, 6, TRACK_LOWER);
    02283         MAYBE_DRAW_SIGNAL(0, SIGNAL_TO_EAST, 7, TRACK_LOWER);
    02284       }
    02285     } else {
    02286       MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHWEST, 8, TRACK_X);
    02287       MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHEAST, 9, TRACK_X);
    02288     }
    02289   } else {
    02290     MAYBE_DRAW_SIGNAL(3, SIGNAL_TO_SOUTHEAST, 10, TRACK_Y);
    02291     MAYBE_DRAW_SIGNAL(2, SIGNAL_TO_NORTHWEST, 11, TRACK_Y);
    02292   }
    02293 }
    02294
    02295 static void DrawTile_Track(TileInfo *ti)
    02296 {
    02297   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    02298
    02299   _drawtile_track_palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
    02300
    02301   if (IsPlainRail(ti->tile)) {
    02302     TrackBits rails = GetTrackBits(ti->tile);
    02303
    02304     DrawTrackBits(ti, rails);
    02305
    02306     if (HasBit(_display_opt, DO_FULL_DETAIL)) DrawTrackDetails(ti, rti);
    02307
    02308     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    02309
    02310     if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
    02311   } else {
    02312     /* draw depot */
    02313     const DrawTileSprites *dts;
    02314     PaletteID pal = PAL_NONE;
    02315     SpriteID relocation;
    02316
    02317     if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);
    02318
    02319     if (IsInvisibilitySet(TO_BUILDINGS)) {
    02320       /* Draw rail instead of depot */
    02321       dts = &_depot_invisible_gfx_table[GetRailDepotDirection(ti->tile)];
    02322     } else {
    02323       dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
    02324     }
    02325
    02326     SpriteID image;
    02327     if (rti->UsesOverlay()) {
    02328       image = SPR_FLAT_GRASS_TILE;
    02329     } else {
    02330       image = dts->ground.sprite;
    02331       if (image != SPR_FLAT_GRASS_TILE) image += rti->GetRailtypeSpriteOffset();
    02332     }
    02333
    02334     /* adjust ground tile for desert
    02335      * don't adjust for snow, because snow in depots looks weird */
    02336     if (IsSnowRailGround(ti->tile) && _settings_game.game_creation.landscape == LT_TROPIC) {
    02337       if (image != SPR_FLAT_GRASS_TILE) {
    02338         image += rti->snow_offset; // tile with tracks
    02339       } else {
    02340         image = SPR_FLAT_SNOW_DESERT_TILE; // flat ground
    02341       }
    02342     }
    02343
    02344     DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, _drawtile_track_palette));
    02345
    02346     if (rti->UsesOverlay()) {
    02347       SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
    02348
    02349       switch (GetRailDepotDirection(ti->tile)) {
    02350         case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02351         case DIAGDIR_SW: DrawGroundSprite(ground + RTO_X, PAL_NONE); break;
    02352         case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02353         case DIAGDIR_SE: DrawGroundSprite(ground + RTO_Y, PAL_NONE); break;
    02354         default: break;
    02355       }
    02356
    02357       if (_settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
    02358         SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
    02359
    02360         switch (GetRailDepotDirection(ti->tile)) {
    02361           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02362           case DIAGDIR_SW: DrawGroundSprite(overlay + RTO_X, PALETTE_CRASH); break;
    02363           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02364           case DIAGDIR_SE: DrawGroundSprite(overlay + RTO_Y, PALETTE_CRASH); break;
    02365           default: break;
    02366         }
    02367       }
    02368     } else {
    02369       /* PBS debugging, draw reserved tracks darker */
    02370       if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasDepotReservation(ti->tile)) {
    02371         switch (GetRailDepotDirection(ti->tile)) {
    02372           case DIAGDIR_NE: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02373           case DIAGDIR_SW: DrawGroundSprite(rti->base_sprites.single_x, PALETTE_CRASH); break;
    02374           case DIAGDIR_NW: if (!IsInvisibilitySet(TO_BUILDINGS)) break; // else FALL THROUGH
    02375           case DIAGDIR_SE: DrawGroundSprite(rti->base_sprites.single_y, PALETTE_CRASH); break;
    02376           default: break;
    02377         }
    02378       }
    02379     }
    02380     int depot_sprite = GetCustomRailSprite(rti, ti->tile, RTSG_DEPOT);
    02381     relocation = depot_sprite != 0 ? depot_sprite - SPR_RAIL_DEPOT_SE_1 : rti->GetRailtypeSpriteOffset();
    02382
    02383     if (HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
    02384
    02385     DrawRailTileSeq(ti, dts, TO_BUILDINGS, relocation, 0, _drawtile_track_palette);
    02386   }
    02387   DrawBridgeMiddle(ti);
    02388 }
    02389
    02390 void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
    02391 {
    02392   const DrawTileSprites *dts = &_depot_gfx_table[dir];
    02393   const RailtypeInfo *rti = GetRailTypeInfo(railtype);
    02394   SpriteID image = rti->UsesOverlay() ? SPR_FLAT_GRASS_TILE : dts->ground.sprite;
    02395   uint32 offset = rti->GetRailtypeSpriteOffset();
    02396
    02397   x += 33;
    02398   y += 17;
    02399
    02400   if (image != SPR_FLAT_GRASS_TILE) image += offset;
    02401   PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
    02402
    02403   DrawSprite(image, PAL_NONE, x, y);
    02404
    02405   if (rti->UsesOverlay()) {
    02406     SpriteID ground = GetCustomRailSprite(rti, INVALID_TILE, RTSG_GROUND);
    02407
    02408     switch (dir) {
    02409       case DIAGDIR_SW: DrawSprite(ground + RTO_X, PAL_NONE, x, y); break;
    02410       case DIAGDIR_SE: DrawSprite(ground + RTO_Y, PAL_NONE, x, y); break;
    02411       default: break;
    02412     }
    02413   }
    02414   int depot_sprite = GetCustomRailSprite(rti, INVALID_TILE, RTSG_DEPOT);
    02415   if (depot_sprite != 0) offset = depot_sprite - SPR_RAIL_DEPOT_SE_1;
    02416
    02417   DrawRailTileSeqInGUI(x, y, dts, offset, 0, palette);
    02418 }
    02419
    02420 static int GetSlopePixelZ_Track(TileIndex tile, uint x, uint y)
    02421 {
    02422   if (IsPlainRail(tile)) {
    02423     int z;
    02424     Slope tileh = GetTilePixelSlope(tile, &z);
    02425     if (tileh == SLOPE_FLAT) return z;
    02426
    02427     z += ApplyPixelFoundationToSlope(GetRailFoundation(tileh, GetTrackBits(tile)), &tileh);
    02428     return z + GetPartialPixelZ(x & 0xF, y & 0xF, tileh);
    02429   } else {
    02430     return GetTileMaxPixelZ(tile);
    02431   }
    02432 }
    02433
    02434 static Foundation GetFoundation_Track(TileIndex tile, Slope tileh)
    02435 {
    02436   return IsPlainRail(tile) ? GetRailFoundation(tileh, GetTrackBits(tile)) : FlatteningFoundation(tileh);
    02437 }
    02438
    02439 static void TileLoop_Track(TileIndex tile)
    02440 {
    02441   RailGroundType old_ground = GetRailGroundType(tile);
    02442   RailGroundType new_ground;
    02443
    02444   if (old_ground == RAIL_GROUND_WATER) {
    02445     TileLoop_Water(tile);
    02446     return;
    02447   }
    02448
    02449   switch (_settings_game.game_creation.landscape) {
    02450     case LT_ARCTIC: {
    02451       int z;
    02452       Slope slope = GetTileSlope(tile, &z);
    02453       bool half = false;
    02454
    02455       /* for non-flat track, use lower part of track
    02456        * in other cases, use the highest part with track */
    02457       if (IsPlainRail(tile)) {
    02458         TrackBits track = GetTrackBits(tile);
    02459         Foundation f = GetRailFoundation(slope, track);
    02460
    02461         switch (f) {
    02462           case FOUNDATION_NONE:
    02463             /* no foundation - is the track on the upper side of three corners raised tile? */
    02464             if (IsSlopeWithThreeCornersRaised(slope)) z++;
    02465             break;
    02466
    02467           case FOUNDATION_INCLINED_X:
    02468           case FOUNDATION_INCLINED_Y:
    02469             /* sloped track - is it on a steep slope? */
    02470             if (IsSteepSlope(slope)) z++;
    02471             break;
    02472
    02473           case FOUNDATION_STEEP_LOWER:
    02474             /* only lower part of steep slope */
    02475             z++;
    02476             break;
    02477
    02478           default:
    02479             /* if it is a steep slope, then there is a track on higher part */
    02480             if (IsSteepSlope(slope)) z++;
    02481             z++;
    02482             break;
    02483         }
    02484
    02485         half = IsInsideMM(f, FOUNDATION_STEEP_BOTH, FOUNDATION_HALFTILE_N + 1);
    02486       } else {
    02487         /* is the depot on a non-flat tile? */
    02488         if (slope != SLOPE_FLAT) z++;
    02489       }
    02490
    02491       /* 'z' is now the lowest part of the highest track bit -
    02492        * for sloped track, it is 'z' of lower part
    02493        * for two track bits, it is 'z' of higher track bit
    02494        * For non-continuous foundations (and STEEP_BOTH), 'half' is set */
    02495       if (z > GetSnowLine()) {
    02496         if (half && z - GetSnowLine() == 1) {
    02497           /* track on non-continuous foundation, lower part is not under snow */
    02498           new_ground = RAIL_GROUND_HALF_SNOW;
    02499         } else {
    02500           new_ground = RAIL_GROUND_ICE_DESERT;
    02501         }
    02502         goto set_ground;
    02503       }
    02504       break;
    02505       }
    02506
    02507     case LT_TROPIC:
    02508       if (GetTropicZone(tile) == TROPICZONE_DESERT) {
    02509         new_ground = RAIL_GROUND_ICE_DESERT;
    02510         goto set_ground;
    02511       }
    02512       break;
    02513   }
    02514
    02515   new_ground = RAIL_GROUND_GRASS;
    02516
    02517   if (IsPlainRail(tile) && old_ground != RAIL_GROUND_BARREN) { // wait until bottom is green
    02518     /* determine direction of fence */
    02519     TrackBits rail = GetTrackBits(tile);
    02520
    02521     switch (rail) {
    02522       case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
    02523       case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
    02524       case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
    02525       case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
    02526
    02527       default: {
    02528         Owner owner = GetTileOwner(tile);
    02529
    02530         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
    02531               (rail & TRACK_BIT_3WAY_NW) == 0 &&
    02532               (rail & TRACK_BIT_X)
    02533             )) {
    02534           TileIndex n = tile + TileDiffXY(0, -1);
    02535           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02536
    02537           if ((!IsTileType(n, MP_RAILWAY) && !IsRailWaypointTile(n)) ||
    02538               !IsTileOwner(n, owner) ||
    02539               nrail == TRACK_BIT_UPPER ||
    02540               nrail == TRACK_BIT_LEFT) {
    02541             new_ground = RAIL_GROUND_FENCE_NW;
    02542           }
    02543         }
    02544
    02545         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
    02546               (rail & TRACK_BIT_3WAY_SE) == 0 &&
    02547               (rail & TRACK_BIT_X)
    02548             )) {
    02549           TileIndex n = tile + TileDiffXY(0, 1);
    02550           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02551
    02552           if ((!IsTileType(n, MP_RAILWAY) && !IsRailWaypointTile(n)) ||
    02553               !IsTileOwner(n, owner) ||
    02554               nrail == TRACK_BIT_LOWER ||
    02555               nrail == TRACK_BIT_RIGHT) {
    02556             new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
    02557               RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
    02558           }
    02559         }
    02560
    02561         if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
    02562               (rail & TRACK_BIT_3WAY_NE) == 0 &&
    02563               (rail & TRACK_BIT_Y)
    02564             )) {
    02565           TileIndex n = tile + TileDiffXY(-1, 0);
    02566           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02567
    02568           if ((!IsTileType(n, MP_RAILWAY) && !IsRailWaypointTile(n)) ||
    02569               !IsTileOwner(n, owner) ||
    02570               nrail == TRACK_BIT_UPPER ||
    02571               nrail == TRACK_BIT_RIGHT) {
    02572             new_ground = RAIL_GROUND_FENCE_NE;
    02573           }
    02574         }
    02575
    02576         if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
    02577               (rail & TRACK_BIT_3WAY_SW) == 0 &&
    02578               (rail & TRACK_BIT_Y)
    02579             )) {
    02580           TileIndex n = tile + TileDiffXY(1, 0);
    02581           TrackBits nrail = (IsPlainRailTile(n) ? GetTrackBits(n) : TRACK_BIT_NONE);
    02582
    02583           if ((!IsTileType(n, MP_RAILWAY) && !IsRailWaypointTile(n)) ||
    02584               !IsTileOwner(n, owner) ||
    02585               nrail == TRACK_BIT_LOWER ||
    02586               nrail == TRACK_BIT_LEFT) {
    02587             new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
    02588               RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
    02589           }
    02590         }
    02591         break;
    02592       }
    02593     }
    02594   }
    02595
    02596 set_ground:
    02597   if (old_ground != new_ground) {
    02598     SetRailGroundType(tile, new_ground);
    02599     MarkTileDirtyByTile(tile);
    02600   }
    02601 }
    02602
    02603
    02604 static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
    02605 {
    02606   /* Case of half tile slope with water. */
    02607   if (mode == TRANSPORT_WATER && IsPlainRail(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER) {
    02608     TrackBits tb = GetTrackBits(tile);
    02609     switch (tb) {
    02610       default: NOT_REACHED();
    02611       case TRACK_BIT_UPPER: tb = TRACK_BIT_LOWER; break;
    02612       case TRACK_BIT_LOWER: tb = TRACK_BIT_UPPER; break;
    02613       case TRACK_BIT_LEFT:  tb = TRACK_BIT_RIGHT; break;
    02614       case TRACK_BIT_RIGHT: tb = TRACK_BIT_LEFT;  break;
    02615     }
    02616     return CombineTrackStatus(TrackBitsToTrackdirBits(tb), TRACKDIR_BIT_NONE);
    02617   }
    02618
    02619   if (mode != TRANSPORT_RAIL) return 0;
    02620
    02621   TrackBits trackbits = TRACK_BIT_NONE;
    02622   TrackdirBits red_signals = TRACKDIR_BIT_NONE;
    02623
    02624   switch (GetRailTileType(tile)) {
    02625     default: NOT_REACHED();
    02626     case RAIL_TILE_NORMAL:
    02627       trackbits = GetTrackBits(tile);
    02628       break;
    02629
    02630     case RAIL_TILE_SIGNALS: {
    02631       trackbits = GetTrackBits(tile);
    02632       byte a = GetPresentSignals(tile);
    02633       uint b = GetSignalStates(tile);
    02634
    02635       b &= a;
    02636
    02637       /* When signals are not present (in neither direction),
    02638        * we pretend them to be green. Otherwise, it depends on
    02639        * the signal type. For signals that are only active from
    02640        * one side, we set the missing signals explicitely to
    02641        * `green'. Otherwise, they implicitely become `red'. */
    02642       if (!IsOnewaySignal(tile, TRACK_UPPER) || (a & SignalOnTrack(TRACK_UPPER)) == 0) b |= ~a & SignalOnTrack(TRACK_UPPER);
    02643       if (!IsOnewaySignal(tile, TRACK_LOWER) || (a & SignalOnTrack(TRACK_LOWER)) == 0) b |= ~a & SignalOnTrack(TRACK_LOWER);
    02644
    02645       if ((b & 0x8) == 0) red_signals |= (TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E);
    02646       if ((b & 0x4) == 0) red_signals |= (TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_UPPER_W);
    02647       if ((b & 0x2) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_E);
    02648       if ((b & 0x1) == 0) red_signals |= (TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LOWER_W);
    02649
    02650       break;
    02651     }
    02652
    02653     case RAIL_TILE_DEPOT: {
    02654       DiagDirection dir = GetRailDepotDirection(tile);
    02655
    02656       if (side != INVALID_DIAGDIR && side != dir) break;
    02657
    02658       trackbits = DiagDirToDiagTrackBits(dir);
    02659       break;
    02660     }
    02661   }
    02662
    02663   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), red_signals);
    02664 }
    02665
    02666 static bool ClickTile_Track(TileIndex tile)
    02667 {
    02668   if (!IsRailDepot(tile)) return false;
    02669
    02670   ShowDepotWindow(tile, VEH_TRAIN);
    02671   return true;
    02672 }
    02673
    02674 static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
    02675 {
    02676   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
    02677   td->rail_speed = rti->max_speed;
    02678   td->owner[0] = GetTileOwner(tile);
    02679   SetDParamX(td->dparam, 0, rti->strings.name);
    02680   switch (GetRailTileType(tile)) {
    02681     case RAIL_TILE_NORMAL:
    02682       td->str = STR_LAI_RAIL_DESCRIPTION_TRACK;
    02683       break;
    02684
    02685     case RAIL_TILE_SIGNALS: {
    02686       static const StringID signal_type[6][6] = {
    02687         {
    02688           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_SIGNALS,
    02689           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
    02690           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
    02691           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02692           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
    02693           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS
    02694         },
    02695         {
    02696           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PRESIGNALS,
    02697           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRESIGNALS,
    02698           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
    02699           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
    02700           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
    02701           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS
    02702         },
    02703         {
    02704           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_EXITSIGNALS,
    02705           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_EXITSIGNALS,
    02706           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXITSIGNALS,
    02707           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
    02708           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
    02709           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS
    02710         },
    02711         {
    02712           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_COMBOSIGNALS,
    02713           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_COMBOSIGNALS,
    02714           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_COMBOSIGNALS,
    02715           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBOSIGNALS,
    02716           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
    02717           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS
    02718         },
    02719         {
    02720           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_PBSSIGNALS,
    02721           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_PBSSIGNALS,
    02722           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_PBSSIGNALS,
    02723           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_PBSSIGNALS,
    02724           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBSSIGNALS,
    02725           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS
    02726         },
    02727         {
    02728           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NORMAL_NOENTRYSIGNALS,
    02729           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PRE_NOENTRYSIGNALS,
    02730           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_EXIT_NOENTRYSIGNALS,
    02731           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_COMBO_NOENTRYSIGNALS,
    02732           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_PBS_NOENTRYSIGNALS,
    02733           STR_LAI_RAIL_DESCRIPTION_TRACK_WITH_NOENTRYSIGNALS
    02734         }
    02735       };
    02736
    02737       SignalType primary_signal;
    02738       SignalType secondary_signal;
    02739       if (HasSignalOnTrack(tile, TRACK_UPPER)) {
    02740         primary_signal = GetSignalType(tile, TRACK_UPPER);
    02741         secondary_signal = HasSignalOnTrack(tile, TRACK_LOWER) ? GetSignalType(tile, TRACK_LOWER) : primary_signal;
    02742       } else {
    02743         secondary_signal = primary_signal = GetSignalType(tile, TRACK_LOWER);
    02744       }
    02745
    02746       td->str = signal_type[secondary_signal][primary_signal];
    02747       break;
    02748     }
    02749
    02750     case RAIL_TILE_DEPOT:
    02751       td->str = STR_LAI_RAIL_DESCRIPTION_TRAIN_DEPOT;
    02752       if (_settings_game.vehicle.train_acceleration_model != AM_ORIGINAL) {
    02753         if (td->rail_speed > 0) {
    02754           td->rail_speed = min(td->rail_speed, 61);
    02755         } else {
    02756           td->rail_speed = 61;
    02757         }
    02758       }
    02759       td->build_date = Depot::GetByTile(tile)->build_date;
    02760       break;
    02761
    02762     default:
    02763       NOT_REACHED();
    02764   }
    02765 }
    02766
    02767 static void ChangeTileOwner_Track(TileIndex tile, Owner old_owner, Owner new_owner)
    02768 {
    02769   if (!IsTileOwner(tile, old_owner)) return;
    02770
    02771   if (new_owner != INVALID_OWNER) {
    02772     /* Update company infrastructure counts. No need to dirty windows here, we'll redraw the whole screen anyway. */
    02773     uint num_pieces = 1;
    02774     if (IsPlainRail(tile)) {
    02775       TrackBits bits = GetTrackBits(tile);
    02776       num_pieces = CountBits(bits);
    02777       if (TracksOverlap(bits)) num_pieces *= num_pieces;
    02778     }
    02779     RailType rt = GetRailType(tile);
    02780     Company::Get(old_owner)->infrastructure.rail[rt] -= num_pieces;
    02781     Company::Get(new_owner)->infrastructure.rail[rt] += num_pieces;
    02782
    02783     if (HasSignals(tile)) {
    02784       uint num_sigs = CountBits(GetPresentSignals(tile));
    02785       Company::Get(old_owner)->infrastructure.signal -= num_sigs;
    02786       Company::Get(new_owner)->infrastructure.signal += num_sigs;
    02787     }
    02788
    02789     SetTileOwner(tile, new_owner);
    02790   } else {
    02791     DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
    02792   }
    02793 }
    02794
    02795 static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
    02796 static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
    02797 static const int8 _deltacoord_leaveoffset[8] = {
    02798   -1,  0,  1,  0, /* x */
    02799    0,  1,  0, -1  /* y */
    02800 };
    02801
    02802
    02809 int TicksToLeaveDepot(const Train *v)
    02810 {
    02811   DiagDirection dir = GetRailDepotDirection(v->tile);
    02812   int length = v->CalcNextVehicleOffset();
    02813
    02814   switch (dir) {
    02815     case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
    02816     case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
    02817     case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
    02818     default:
    02819     case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
    02820   }
    02821
    02822   return 0; // make compilers happy
    02823 }
    02824
    02829 static VehicleEnterTileStatus VehicleEnter_Track(Vehicle *u, TileIndex tile, int x, int y)
    02830 {
    02831   /* this routine applies only to trains in depot tiles */
    02832   if (u->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
    02833
    02834   Train *v = Train::From(u);
    02835
    02836   /* depot direction */
    02837   DiagDirection dir = GetRailDepotDirection(tile);
    02838
    02839   /* Calculate the point where the following wagon should be activated. */
    02840   int length = v->CalcNextVehicleOffset();
    02841
    02842   byte fract_coord_leave =
    02843     ((_fractcoords_enter[dir] & 0x0F) + // x
    02844       (length + 1) * _deltacoord_leaveoffset[dir]) +
    02845     (((_fractcoords_enter[dir] >> 4) +  // y
    02846       ((length + 1) * _deltacoord_leaveoffset[dir + 4])) << 4);
    02847
    02848   byte fract_coord = (x & 0xF) + ((y & 0xF) << 4);
    02849
    02850   if (_fractcoords_behind[dir] == fract_coord) {
    02851     /* make sure a train is not entering the tile from behind */
    02852     return VETSB_CANNOT_ENTER;
    02853   } else if (_fractcoords_enter[dir] == fract_coord) {
    02854     if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
    02855       /* enter the depot */
    02856       v->track = TRACK_BIT_DEPOT,
    02857       v->vehstatus |= VS_HIDDEN; // hide it
    02858       v->direction = ReverseDir(v->direction);
    02859       if (v->Next() == NULL) VehicleEnterDepot(v->First());
    02860       v->tile = tile;
    02861
    02862       InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
    02863       return VETSB_ENTERED_WORMHOLE;
    02864     }
    02865   } else if (fract_coord_leave == fract_coord) {
    02866     if (DiagDirToDir(dir) == v->direction) {
    02867       /* leave the depot? */
    02868       if ((v = v->Next()) != NULL) {
    02869         v->vehstatus &= ~VS_HIDDEN;
    02870         v->track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
    02871       }
    02872     }
    02873   }
    02874
    02875   return VETSB_CONTINUE;
    02876 }
    02877
    02889 static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, int z_old, Slope tileh_old, int z_new, Slope tileh_new, TrackBits rail_bits)
    02890 {
    02891   if (!_settings_game.construction.build_on_slopes || !AutoslopeEnabled()) return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
    02892
    02893   /* Is the slope-rail_bits combination valid in general? I.e. is it safe to call GetRailFoundation() ? */
    02894   if (CheckRailSlope(tileh_new, rail_bits, TRACK_BIT_NONE, tile).Failed()) return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
    02895
    02896   /* Get the slopes on top of the foundations */
    02897   z_old += ApplyFoundationToSlope(GetRailFoundation(tileh_old, rail_bits), &tileh_old);
    02898   z_new += ApplyFoundationToSlope(GetRailFoundation(tileh_new, rail_bits), &tileh_new);
    02899
    02900   Corner track_corner;
    02901   switch (rail_bits) {
    02902     case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;
    02903     case TRACK_BIT_LOWER: track_corner = CORNER_S; break;
    02904     case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;
    02905     case TRACK_BIT_UPPER: track_corner = CORNER_N; break;
    02906
    02907     /* Surface slope must not be changed */
    02908     default:
    02909       if (z_old != z_new || tileh_old != tileh_new) return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
    02910       return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    02911   }
    02912
    02913   /* The height of the track_corner must not be changed. The rest ensures GetRailFoundation() already. */
    02914   z_old += GetSlopeZInCorner(RemoveHalftileSlope(tileh_old), track_corner);
    02915   z_new += GetSlopeZInCorner(RemoveHalftileSlope(tileh_new), track_corner);
    02916   if (z_old != z_new) return_cmd_error(STR_ERROR_MUST_REMOVE_RAILROAD_TRACK);
    02917
    02918   CommandCost cost = CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    02919   /* Make the ground dirty, if surface slope has changed */
    02920   if (tileh_old != tileh_new) {
    02921     /* If there is flat water on the lower halftile add the cost for clearing it */
    02922     if (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old)) cost.AddCost(_price[PR_CLEAR_WATER]);
    02923     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02924   }
    02925   return  cost;
    02926 }
    02927
    02928 static CommandCost TerraformTile_Track(TileIndex tile, DoCommandFlag flags, int z_new, Slope tileh_new)
    02929 {
    02930   int z_old;
    02931   Slope tileh_old = GetTileSlope(tile, &z_old);
    02932   if (IsPlainRail(tile)) {
    02933     TrackBits rail_bits = GetTrackBits(tile);
    02934     /* Is there flat water on the lower halftile that must be cleared expensively? */
    02935     bool was_water = (GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(tileh_old));
    02936
    02937     /* First test autoslope. However if it succeeds we still have to test the rest, because non-autoslope terraforming is cheaper. */
    02938     CommandCost autoslope_result = TestAutoslopeOnRailTile(tile, flags, z_old, tileh_old, z_new, tileh_new, rail_bits);
    02939
    02940     /* When there is only a single horizontal/vertical track, one corner can be terraformed. */
    02941     Corner allowed_corner;
    02942     switch (rail_bits) {
    02943       case TRACK_BIT_RIGHT: allowed_corner = CORNER_W; break;
    02944       case TRACK_BIT_UPPER: allowed_corner = CORNER_S; break;
    02945       case TRACK_BIT_LEFT:  allowed_corner = CORNER_E; break;
    02946       case TRACK_BIT_LOWER: allowed_corner = CORNER_N; break;
    02947       default: return autoslope_result;
    02948     }
    02949
    02950     Foundation f_old = GetRailFoundation(tileh_old, rail_bits);
    02951
    02952     /* Do not allow terraforming if allowed_corner is part of anti-zig-zag foundations */
    02953     if (tileh_old != SLOPE_NS && tileh_old != SLOPE_EW && IsSpecialRailFoundation(f_old)) return autoslope_result;
    02954
    02955     /* Everything is valid, which only changes allowed_corner */
    02956     for (Corner corner = (Corner)0; corner < CORNER_END; corner = (Corner)(corner + 1)) {
    02957       if (allowed_corner == corner) continue;
    02958       if (z_old + GetSlopeZInCorner(tileh_old, corner) != z_new + GetSlopeZInCorner(tileh_new, corner)) return autoslope_result;
    02959     }
    02960
    02961     /* Make the ground dirty */
    02962     if ((flags & DC_EXEC) != 0) SetRailGroundType(tile, RAIL_GROUND_BARREN);
    02963
    02964     /* allow terraforming */
    02965     return CommandCost(EXPENSES_CONSTRUCTION, was_water ? _price[PR_CLEAR_WATER] : (Money)0);
    02966   } else if (_settings_game.construction.build_on_slopes && AutoslopeEnabled() &&
    02967       AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRailDepotDirection(tile))) {
    02968     return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
    02969   }
    02970   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    02971 }
    02972
    02973
    02974 extern const TileTypeProcs _tile_type_rail_procs = {
    02975   DrawTile_Track,           // draw_tile_proc
    02976   GetSlopePixelZ_Track,     // get_slope_z_proc
    02977   ClearTile_Track,          // clear_tile_proc
    02978   NULL,                     // add_accepted_cargo_proc
    02979   GetTileDesc_Track,        // get_tile_desc_proc
    02980   GetTileTrackStatus_Track, // get_tile_track_status_proc
    02981   ClickTile_Track,          // click_tile_proc
    02982   NULL,                     // animate_tile_proc
    02983   TileLoop_Track,           // tile_loop_proc
    02984   ChangeTileOwner_Track,    // change_tile_owner_proc
    02985   NULL,                     // add_produced_cargo_proc
    02986   VehicleEnter_Track,       // vehicle_enter_tile_proc
    02987   GetFoundation_Track,      // get_foundation_proc
    02988   TerraformTile_Track,      // terraform_tile_proc
    02989 };