# elrail.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
    00057 #include "stdafx.h"
    00058 #include "station_map.h"
    00059 #include "viewport_func.h"
    00060 #include "train.h"
    00061 #include "rail_gui.h"
    00062 #include "tunnelbridge_map.h"
    00063 #include "tunnelbridge.h"
    00064 #include "elrail_func.h"
    00065 #include "company_base.h"
    00066 #include "newgrf_railtype.h"
    00067
    00068 #include "table/elrail_data.h"
    00069
    00075 static inline TLG GetTLG(TileIndex t)
    00076 {
    00077   return (TLG)((HasBit(TileX(t), 0) << 1) + HasBit(TileY(t), 0));
    00078 }
    00079
    00086 static TrackBits GetRailTrackBitsUniversal(TileIndex t, byte *override)
    00087 {
    00088   switch (GetTileType(t)) {
    00089     case MP_RAILWAY:
    00090       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
    00091       switch (GetRailTileType(t)) {
    00092         case RAIL_TILE_NORMAL: case RAIL_TILE_SIGNALS:
    00093           return GetTrackBits(t);
    00094         default:
    00095           return TRACK_BIT_NONE;
    00096       }
    00097       break;
    00098
    00099     case MP_TUNNELBRIDGE:
    00100       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
    00101       if (override != NULL && (IsTunnel(t) || GetTunnelBridgeLength(t, GetOtherBridgeEnd(t)) > 0)) {
    00102         *override = 1 << GetTunnelBridgeDirection(t);
    00103       }
    00104       return DiagDirToDiagTrackBits(GetTunnelBridgeDirection(t));
    00105
    00106     case MP_ROAD:
    00107       if (!IsLevelCrossing(t)) return TRACK_BIT_NONE;
    00108       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
    00109       return GetCrossingRailBits(t);
    00110
    00111     case MP_STATION:
    00112       if (!HasStationRail(t)) return TRACK_BIT_NONE;
    00113       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
    00114       return TrackToTrackBits(GetRailStationTrack(t));
    00115
    00116     default:
    00117       return TRACK_BIT_NONE;
    00118   }
    00119 }
    00120
    00124 static TrackBits MaskWireBits(TileIndex t, TrackBits tracks)
    00125 {
    00126   if (!IsPlainRailTile(t)) return tracks;
    00127
    00128   TrackdirBits neighbour_tdb = TRACKDIR_BIT_NONE;
    00129   for (DiagDirection d = DIAGDIR_BEGIN; d < DIAGDIR_END; d++) {
    00130     /* If the neighbor tile is either not electrified or has no tracks that can be reached
    00131      * from this tile, mark all trackdirs that can be reached from the neighbour tile
    00132      * as needing no catenary. */
    00133     RailType rt = GetTileRailType(TileAddByDiagDir(t, d));
    00134     if (rt == INVALID_RAILTYPE || !HasCatenary(rt) || (TrackStatusToTrackBits(GetTileTrackStatus(TileAddByDiagDir(t, d), TRANSPORT_RAIL, 0)) & DiagdirReachesTracks(d)) == TRACK_BIT_NONE) {
    00135       neighbour_tdb |= DiagdirReachesTrackdirs(ReverseDiagDir(d));
    00136     }
    00137   }
    00138
    00139   /* If the tracks from either a diagonal crossing or don't overlap, both
    00140    * trackdirs have to be marked to mask the corresponding track bit. Else
    00141    * one marked trackdir is enough the mask the track bit. */
    00142   TrackBits mask;
    00143   if (tracks == TRACK_BIT_CROSS || !TracksOverlap(tracks)) {
    00144     /* If the tracks form either a diagonal crossing or don't overlap, both
    00145      * trackdirs have to be marked to mask the corresponding track bit. */
    00146     mask = ~(TrackBits)((neighbour_tdb & (neighbour_tdb >> 8)) & TRACK_BIT_MASK);
    00147     /* If that results in no masked tracks and it is not a diagonal crossing,
    00148      * require only one marked trackdir to mask. */
    00149     if (tracks != TRACK_BIT_CROSS && (mask & TRACK_BIT_MASK) == TRACK_BIT_MASK) mask = ~TrackdirBitsToTrackBits(neighbour_tdb);
    00150   } else {
    00151     /* Require only one marked trackdir to mask the track. */
    00152     mask = ~TrackdirBitsToTrackBits(neighbour_tdb);
    00153     /* If that results in an empty set, require both trackdirs for diagonal track. */
    00154     if ((tracks & mask) == TRACK_BIT_NONE) {
    00155       if ((neighbour_tdb & TRACKDIR_BIT_X_NE) == 0 || (neighbour_tdb & TRACKDIR_BIT_X_SW) == 0) mask |= TRACK_BIT_X;
    00156       if ((neighbour_tdb & TRACKDIR_BIT_Y_NW) == 0 || (neighbour_tdb & TRACKDIR_BIT_Y_SE) == 0) mask |= TRACK_BIT_Y;
    00157       /* If that still is not enough, require both trackdirs for any track. */
    00158       if ((tracks & mask) == TRACK_BIT_NONE) mask = ~(TrackBits)((neighbour_tdb & (neighbour_tdb >> 8)) & TRACK_BIT_MASK);
    00159     }
    00160   }
    00161
    00162   /* Mask the tracks only if at least one track bit would remain. */
    00163   return (tracks & mask) != TRACK_BIT_NONE ? tracks & mask : tracks;
    00164 }
    00165
    00169 static inline SpriteID GetWireBase(TileIndex tile, TileContext context = TCX_NORMAL)
    00170 {
    00171   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
    00172   SpriteID wires = GetCustomRailSprite(rti, tile, RTSG_WIRES, context);
    00173   return wires == 0 ? SPR_WIRE_BASE : wires;
    00174 }
    00175
    00179 static inline SpriteID GetPylonBase(TileIndex tile, TileContext context = TCX_NORMAL)
    00180 {
    00181   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
    00182   SpriteID pylons = GetCustomRailSprite(rti, tile, RTSG_PYLONS, context);
    00183   return pylons == 0 ? SPR_PYLON_BASE : pylons;
    00184 }
    00185
    00191 static void AdjustTileh(TileIndex tile, Slope *tileh)
    00192 {
    00193   if (IsTileType(tile, MP_TUNNELBRIDGE)) {
    00194     if (IsTunnel(tile)) {
    00195       *tileh = SLOPE_STEEP; // XXX - Hack to make tunnel entrances to always have a pylon
    00196     } else if (*tileh != SLOPE_FLAT) {
    00197       *tileh = SLOPE_FLAT;
    00198     } else {
    00199       *tileh = InclinedSlope(GetTunnelBridgeDirection(tile));
    00200     }
    00201   }
    00202 }
    00203
    00211 static int GetPCPElevation(TileIndex tile, DiagDirection PCPpos)
    00212 {
    00213   /* The elevation of the "pylon"-sprite should be the elevation at the PCP.
    00214    * PCPs are always on a tile edge.
    00215    *
    00216    * This position can be outside of the tile, i.e. ?_pcp_offset == TILE_SIZE > TILE_SIZE - 1.
    00217    * So we have to move it inside the tile, because if the neighboured tile has a foundation,
    00218    * that does not smoothly connect to the current tile, we will get a wrong elevation from GetSlopePixelZ().
    00219    *
    00220    * When we move the position inside the tile, we will get a wrong elevation if we have a slope.
    00221    * To catch all cases we round the Z position to the next (TILE_HEIGHT / 2).
    00222    * This will return the correct elevation for slopes and will also detect non-continuous elevation on edges.
    00223    *
    00224    * Also note that the result of GetSlopePixelZ() is very special on bridge-ramps.
    00225    */
    00226
    00227   int z = GetSlopePixelZ(TileX(tile) * TILE_SIZE + min(x_pcp_offsets[PCPpos], TILE_SIZE - 1), TileY(tile) * TILE_SIZE + min(y_pcp_offsets[PCPpos], TILE_SIZE - 1));
    00228   return (z + 2) & ~3; // this means z = (z + TILE_HEIGHT / 4) / (TILE_HEIGHT / 2) * (TILE_HEIGHT / 2);
    00229 }
    00230
    00238 void DrawCatenaryOnTunnel(const TileInfo *ti)
    00239 {
    00240   /* xmin, ymin, xmax + 1, ymax + 1 of BB */
    00241   static const int _tunnel_wire_BB[4][4] = {
    00242     { 0, 1, 16, 15 }, // NE
    00243     { 1, 0, 15, 16 }, // SE
    00244     { 0, 1, 16, 15 }, // SW
    00245     { 1, 0, 15, 16 }, // NW
    00246   };
    00247
    00248   DiagDirection dir = GetTunnelBridgeDirection(ti->tile);
    00249
    00250   SpriteID wire_base = GetWireBase(ti->tile);
    00251
    00252   const SortableSpriteStruct *sss = &CatenarySpriteData_Tunnel[dir];
    00253   const int *BB_data = _tunnel_wire_BB[dir];
    00254   AddSortableSpriteToDraw(
    00255     wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
    00256     BB_data[2] - sss->x_offset, BB_data[3] - sss->y_offset, BB_Z_SEPARATOR - sss->z_offset + 1,
    00257     GetTilePixelZ(ti->tile) + sss->z_offset,
    00258     IsTransparencySet(TO_CATENARY),
    00259     BB_data[0] - sss->x_offset, BB_data[1] - sss->y_offset, BB_Z_SEPARATOR - sss->z_offset
    00260   );
    00261 }
    00262
    00267 static void DrawCatenaryRailway(const TileInfo *ti)
    00268 {
    00269   /* Pylons are placed on a tile edge, so we need to take into account
    00270    * the track configuration of 2 adjacent tiles. trackconfig[0] stores the
    00271    * current tile (home tile) while [1] holds the neighbour */
    00272   TrackBits trackconfig[TS_END];
    00273   TrackBits wireconfig[TS_END];
    00274   bool isflat[TS_END];
    00275   /* Note that ti->tileh has already been adjusted for Foundations */
    00276   Slope tileh[TS_END] = { ti->tileh, SLOPE_FLAT };
    00277
    00278   /* Half tile slopes coincide only with horizontal/vertical track.
    00279    * Faking a flat slope results in the correct sprites on positions. */
    00280   Corner halftile_corner = CORNER_INVALID;
    00281   if (IsHalftileSlope(tileh[TS_HOME])) {
    00282     halftile_corner = GetHalftileSlopeCorner(tileh[TS_HOME]);
    00283     tileh[TS_HOME] = SLOPE_FLAT;
    00284   }
    00285
    00286   TLG tlg = GetTLG(ti->tile);
    00287   byte PCPstatus = 0;
    00288   byte OverridePCP = 0;
    00289   byte PPPpreferred[DIAGDIR_END];
    00290   byte PPPallowed[DIAGDIR_END];
    00291
    00292   /* Find which rail bits are present, and select the override points.
    00293    * We don't draw a pylon:
    00294    * 1) INSIDE a tunnel (we wouldn't see it anyway)
    00295    * 2) on the "far" end of a bridge head (the one that connects to bridge middle),
    00296    *    because that one is drawn on the bridge. Exception is for length 0 bridges
    00297    *    which have no middle tiles */
    00298   trackconfig[TS_HOME] = GetRailTrackBitsUniversal(ti->tile, &OverridePCP);
    00299   wireconfig[TS_HOME] = MaskWireBits(ti->tile, trackconfig[TS_HOME]);
    00300   /* If a track bit is present that is not in the main direction, the track is level */
    00301   isflat[TS_HOME] = ((trackconfig[TS_HOME] & (TRACK_BIT_HORZ | TRACK_BIT_VERT)) != 0);
    00302
    00303   AdjustTileh(ti->tile, &tileh[TS_HOME]);
    00304
    00305   SpriteID pylon_normal = GetPylonBase(ti->tile);
    00306   SpriteID pylon_halftile = (halftile_corner != CORNER_INVALID) ? GetPylonBase(ti->tile, TCX_UPPER_HALFTILE) : pylon_normal;
    00307
    00308   for (DiagDirection i = DIAGDIR_BEGIN; i < DIAGDIR_END; i++) {
    00309     static const uint edge_corners[] = {
    00310       1 << CORNER_N | 1 << CORNER_E, // DIAGDIR_NE
    00311       1 << CORNER_S | 1 << CORNER_E, // DIAGDIR_SE
    00312       1 << CORNER_S | 1 << CORNER_W, // DIAGDIR_SW
    00313       1 << CORNER_N | 1 << CORNER_W, // DIAGDIR_NW
    00314     };
    00315     SpriteID pylon_base = (halftile_corner != CORNER_INVALID && HasBit(edge_corners[i], halftile_corner)) ? pylon_halftile : pylon_normal;
    00316     TileIndex neighbour = ti->tile + TileOffsByDiagDir(i);
    00317     int elevation = GetPCPElevation(ti->tile, i);
    00318
    00319     /* Here's one of the main headaches. GetTileSlope does not correct for possibly
    00320      * existing foundataions, so we do have to do that manually later on.*/
    00321     tileh[TS_NEIGHBOUR] = GetTileSlope(neighbour);
    00322     trackconfig[TS_NEIGHBOUR] = GetRailTrackBitsUniversal(neighbour, NULL);
    00323     wireconfig[TS_NEIGHBOUR] = MaskWireBits(neighbour, trackconfig[TS_NEIGHBOUR]);
    00324     if (IsTunnelTile(neighbour) && i != GetTunnelBridgeDirection(neighbour)) wireconfig[TS_NEIGHBOUR] = trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;
    00325
    00326     /* If the neighboured tile does not smoothly connect to the current tile (because of a foundation),
    00327      * we have to draw all pillars on the current tile. */
    00328     if (elevation != GetPCPElevation(neighbour, ReverseDiagDir(i))) wireconfig[TS_NEIGHBOUR] = trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;
    00329
    00330     isflat[TS_NEIGHBOUR] = ((trackconfig[TS_NEIGHBOUR] & (TRACK_BIT_HORZ | TRACK_BIT_VERT)) != 0);
    00331
    00332     PPPpreferred[i] = 0xFF; // We start with preferring everything (end-of-line in any direction)
    00333     PPPallowed[i] = AllowedPPPonPCP[i];
    00334
    00335     /* We cycle through all the existing tracks at a PCP and see what
    00336      * PPPs we want to have, or may not have at all */
    00337     for (uint k = 0; k < NUM_TRACKS_AT_PCP; k++) {
    00338       /* Next to us, we have a bridge head, don't worry about that one, if it shows away from us */
    00339       if (TrackSourceTile[i][k] == TS_NEIGHBOUR &&
    00340           IsBridgeTile(neighbour) &&
    00341           GetTunnelBridgeDirection(neighbour) == ReverseDiagDir(i)) {
    00342         continue;
    00343       }
    00344
    00345       /* We check whether the track in question (k) is present in the tile
    00346        * (TrackSourceTile) */
    00347       DiagDirection PCPpos = i;
    00348       if (HasBit(wireconfig[TrackSourceTile[i][k]], TracksAtPCP[i][k])) {
    00349         /* track found, if track is in the neighbour tile, adjust the number
    00350          * of the PCP for preferred/allowed determination*/
    00351         PCPpos = (TrackSourceTile[i][k] == TS_HOME) ? i : ReverseDiagDir(i);
    00352         SetBit(PCPstatus, i); // This PCP is in use
    00353         PPPpreferred[i] &= PreferredPPPofTrackAtPCP[TracksAtPCP[i][k]][PCPpos];
    00354       }
    00355
    00356       if (HasBit(trackconfig[TrackSourceTile[i][k]], TracksAtPCP[i][k])) {
    00357         PPPallowed[i] &= ~DisallowedPPPofTrackAtPCP[TracksAtPCP[i][k]][PCPpos];
    00358       }
    00359     }
    00360
    00361     /* Deactivate all PPPs if PCP is not used */
    00362     if (!HasBit(PCPstatus, i)) {
    00363       PPPpreferred[i] = 0;
    00364       PPPallowed[i] = 0;
    00365     }
    00366
    00367     Foundation foundation = FOUNDATION_NONE;
    00368
    00369     /* Station and road crossings are always "flat", so adjust the tileh accordingly */
    00370     if (IsTileType(neighbour, MP_STATION) || IsTileType(neighbour, MP_ROAD)) tileh[TS_NEIGHBOUR] = SLOPE_FLAT;
    00371
    00372     /* Read the foundataions if they are present, and adjust the tileh */
    00373     if (trackconfig[TS_NEIGHBOUR] != TRACK_BIT_NONE && IsTileType(neighbour, MP_RAILWAY) && HasCatenary(GetRailType(neighbour))) foundation = GetRailFoundation(tileh[TS_NEIGHBOUR], trackconfig[TS_NEIGHBOUR]);
    00374     if (IsBridgeTile(neighbour)) {
    00375       foundation = GetBridgeFoundation(tileh[TS_NEIGHBOUR], DiagDirToAxis(GetTunnelBridgeDirection(neighbour)));
    00376     }
    00377
    00378     ApplyFoundationToSlope(foundation, &tileh[TS_NEIGHBOUR]);
    00379
    00380     /* Half tile slopes coincide only with horizontal/vertical track.
    00381      * Faking a flat slope results in the correct sprites on positions. */
    00382     if (IsHalftileSlope(tileh[TS_NEIGHBOUR])) tileh[TS_NEIGHBOUR] = SLOPE_FLAT;
    00383
    00384     AdjustTileh(neighbour, &tileh[TS_NEIGHBOUR]);
    00385
    00386     /* If we have a straight (and level) track, we want a pylon only every 2 tiles
    00387      * Delete the PCP if this is the case.
    00388      * Level means that the slope is the same, or the track is flat */
    00389     if (tileh[TS_HOME] == tileh[TS_NEIGHBOUR] || (isflat[TS_HOME] && isflat[TS_NEIGHBOUR])) {
    00390       for (uint k = 0; k < NUM_IGNORE_GROUPS; k++) {
    00391         if (PPPpreferred[i] == IgnoredPCP[k][tlg][i]) ClrBit(PCPstatus, i);
    00392       }
    00393     }
    00394
    00395     /* Now decide where we draw our pylons. First try the preferred PPPs, but they may not exist.
    00396      * In that case, we try the any of the allowed ones. if they don't exist either, don't draw
    00397      * anything. Note that the preferred PPPs still contain the end-of-line markers.
    00398      * Remove those (simply by ANDing with allowed, since these markers are never allowed) */
    00399     if ((PPPallowed[i] & PPPpreferred[i]) != 0) PPPallowed[i] &= PPPpreferred[i];
    00400
    00401     if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile)) {
    00402       Track bridgetrack = GetBridgeAxis(ti->tile) == AXIS_X ? TRACK_X : TRACK_Y;
    00403       int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
    00404
    00405       if ((height <= GetTileMaxZ(ti->tile) + 1) &&
    00406           (i == PCPpositions[bridgetrack][0] || i == PCPpositions[bridgetrack][1])) {
    00407         SetBit(OverridePCP, i);
    00408       }
    00409     }
    00410
    00411     if (PPPallowed[i] != 0 && HasBit(PCPstatus, i) && !HasBit(OverridePCP, i) &&
    00412         (!IsRailStationTile(ti->tile) || CanStationTileHavePylons(ti->tile))) {
    00413       for (Direction k = DIR_BEGIN; k < DIR_END; k++) {
    00414         byte temp = PPPorder[i][GetTLG(ti->tile)][k];
    00415
    00416         if (HasBit(PPPallowed[i], temp)) {
    00417           uint x  = ti->x + x_pcp_offsets[i] + x_ppp_offsets[temp];
    00418           uint y  = ti->y + y_pcp_offsets[i] + y_ppp_offsets[temp];
    00419
    00420           /* Don't build the pylon if it would be outside the tile */
    00421           if (!HasBit(OwnedPPPonPCP[i], temp)) {
    00422             /* We have a neighour that will draw it, bail out */
    00423             if (trackconfig[TS_NEIGHBOUR] != TRACK_BIT_NONE) break;
    00424             continue; // No neighbour, go looking for a better position
    00425           }
    00426
    00427           AddSortableSpriteToDraw(pylon_base + pylon_sprites[temp], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE,
    00428             elevation, IsTransparencySet(TO_CATENARY), -1, -1);
    00429
    00430           break; // We already have drawn a pylon, bail out
    00431         }
    00432       }
    00433     }
    00434   }
    00435
    00436   /* The wire above the tunnel is drawn together with the tunnel-roof (see DrawCatenaryOnTunnel()) */
    00437   if (IsTunnelTile(ti->tile)) return;
    00438
    00439   /* Don't draw a wire under a low bridge */
    00440   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_BRIDGES)) {
    00441     int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
    00442
    00443     if (height <= GetTileMaxZ(ti->tile) + 1) return;
    00444   }
    00445
    00446   /* Don't draw a wire if the station tile does not want any */
    00447   if (IsRailStationTile(ti->tile) && !CanStationTileHaveWires(ti->tile)) return;
    00448
    00449   SpriteID wire_normal = GetWireBase(ti->tile);
    00450   SpriteID wire_halftile = (halftile_corner != CORNER_INVALID) ? GetWireBase(ti->tile, TCX_UPPER_HALFTILE) : wire_normal;
    00451   Track halftile_track;
    00452   switch (halftile_corner) {
    00453     case CORNER_W: halftile_track = TRACK_LEFT; break;
    00454     case CORNER_S: halftile_track = TRACK_LOWER; break;
    00455     case CORNER_E: halftile_track = TRACK_RIGHT; break;
    00456     case CORNER_N: halftile_track = TRACK_UPPER; break;
    00457     default:       halftile_track = INVALID_TRACK; break;
    00458   }
    00459
    00460   /* Drawing of pylons is finished, now draw the wires */
    00461   Track t;
    00462   FOR_EACH_SET_TRACK(t, wireconfig[TS_HOME]) {
    00463     SpriteID wire_base = (t == halftile_track) ? wire_halftile : wire_normal;
    00464     byte PCPconfig = HasBit(PCPstatus, PCPpositions[t][0]) +
    00465       (HasBit(PCPstatus, PCPpositions[t][1]) << 1);
    00466
    00467     const SortableSpriteStruct *sss;
    00468     int tileh_selector = !(tileh[TS_HOME] % 3) * tileh[TS_HOME] / 3; // tileh for the slopes, 0 otherwise
    00469
    00470     assert(PCPconfig != 0); // We have a pylon on neither end of the wire, that doesn't work (since we have no sprites for that)
    00471     assert(!IsSteepSlope(tileh[TS_HOME]));
    00472     sss = &CatenarySpriteData[Wires[tileh_selector][t][PCPconfig]];
    00473
    00474     /*
    00475      * The "wire"-sprite position is inside the tile, i.e. 0 <= sss->?_offset < TILE_SIZE.
    00476      * Therefore it is safe to use GetSlopePixelZ() for the elevation.
    00477      * Also note that the result of GetSlopePixelZ() is very special for bridge-ramps.
    00478      */
    00479     AddSortableSpriteToDraw(wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
    00480       sss->x_size, sss->y_size, sss->z_size, GetSlopePixelZ(ti->x + sss->x_offset, ti->y + sss->y_offset) + sss->z_offset,
    00481       IsTransparencySet(TO_CATENARY));
    00482   }
    00483 }
    00484
    00492 void DrawCatenaryOnBridge(const TileInfo *ti)
    00493 {
    00494   TileIndex end = GetSouthernBridgeEnd(ti->tile);
    00495   TileIndex start = GetOtherBridgeEnd(end);
    00496
    00497   uint length = GetTunnelBridgeLength(start, end);
    00498   uint num = GetTunnelBridgeLength(ti->tile, start) + 1;
    00499   uint height;
    00500
    00501   const SortableSpriteStruct *sss;
    00502   Axis axis = GetBridgeAxis(ti->tile);
    00503   TLG tlg = GetTLG(ti->tile);
    00504
    00505   CatenarySprite offset = (CatenarySprite)(axis == AXIS_X ? 0 : WIRE_Y_FLAT_BOTH - WIRE_X_FLAT_BOTH);
    00506
    00507   if ((length % 2) && num == length) {
    00508     /* Draw the "short" wire on the southern end of the bridge
    00509      * only needed if the length of the bridge is odd */
    00510     sss = &CatenarySpriteData[WIRE_X_FLAT_BOTH + offset];
    00511   } else {
    00512     /* Draw "long" wires on all other tiles of the bridge (one pylon every two tiles) */
    00513     sss = &CatenarySpriteData[WIRE_X_FLAT_SW + (num % 2) + offset];
    00514   }
    00515
    00516   height = GetBridgePixelHeight(end);
    00517
    00518   SpriteID wire_base = GetWireBase(end, TCX_ON_BRIDGE);
    00519
    00520   AddSortableSpriteToDraw(wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
    00521     sss->x_size, sss->y_size, sss->z_size, height + sss->z_offset,
    00522     IsTransparencySet(TO_CATENARY)
    00523   );
    00524
    00525   SpriteID pylon_base = GetPylonBase(end, TCX_ON_BRIDGE);
    00526
    00527   /* Finished with wires, draw pylons
    00528    * every other tile needs a pylon on the northern end */
    00529   if (num % 2) {
    00530     DiagDirection PCPpos = (axis == AXIS_X ? DIAGDIR_NE : DIAGDIR_NW);
    00531     Direction PPPpos = (axis == AXIS_X ? DIR_NW : DIR_NE);
    00532     if (HasBit(tlg, (axis == AXIS_X ? 0 : 1))) PPPpos = ReverseDir(PPPpos);
    00533     uint x = ti->x + x_pcp_offsets[PCPpos] + x_ppp_offsets[PPPpos];
    00534     uint y = ti->y + y_pcp_offsets[PCPpos] + y_ppp_offsets[PPPpos];
    00535     AddSortableSpriteToDraw(pylon_base + pylon_sprites[PPPpos], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, height, IsTransparencySet(TO_CATENARY), -1, -1);
    00536   }
    00537
    00538   /* need a pylon on the southern end of the bridge */
    00539   if (GetTunnelBridgeLength(ti->tile, start) + 1 == length) {
    00540     DiagDirection PCPpos = (axis == AXIS_X ? DIAGDIR_SW : DIAGDIR_SE);
    00541     Direction PPPpos = (axis == AXIS_X ? DIR_NW : DIR_NE);
    00542     if (HasBit(tlg, (axis == AXIS_X ? 0 : 1))) PPPpos = ReverseDir(PPPpos);
    00543     uint x = ti->x + x_pcp_offsets[PCPpos] + x_ppp_offsets[PPPpos];
    00544     uint y = ti->y + y_pcp_offsets[PCPpos] + y_ppp_offsets[PPPpos];
    00545     AddSortableSpriteToDraw(pylon_base + pylon_sprites[PPPpos], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, height, IsTransparencySet(TO_CATENARY), -1, -1);
    00546   }
    00547 }
    00548
    00554 void DrawCatenary(const TileInfo *ti)
    00555 {
    00556   switch (GetTileType(ti->tile)) {
    00557     case MP_RAILWAY:
    00558       if (IsRailDepot(ti->tile)) {
    00559         const SortableSpriteStruct *sss = &CatenarySpriteData_Depot[GetRailDepotDirection(ti->tile)];
    00560
    00561         SpriteID wire_base = GetWireBase(ti->tile);
    00562
    00563         /* This wire is not visible with the default depot sprites */
    00564         AddSortableSpriteToDraw(
    00565           wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
    00566           sss->x_size, sss->y_size, sss->z_size,
    00567           GetTileMaxPixelZ(ti->tile) + sss->z_offset,
    00568           IsTransparencySet(TO_CATENARY)
    00569         );
    00570         return;
    00571       }
    00572       break;
    00573
    00574     case MP_TUNNELBRIDGE:
    00575     case MP_ROAD:
    00576     case MP_STATION:
    00577       break;
    00578
    00579     default: return;
    00580   }
    00581   DrawCatenaryRailway(ti);
    00582 }
    00583
    00584 bool SettingsDisableElrail(int32 p1)
    00585 {
    00586   Company *c;
    00587   Train *t;
    00588   bool disable = (p1 != 0);
    00589
    00590   /* we will now walk through all electric train engines and change their railtypes if it is the wrong one*/
    00591   const RailType old_railtype = disable ? RAILTYPE_ELECTRIC : RAILTYPE_RAIL;
    00592   const RailType new_railtype = disable ? RAILTYPE_RAIL : RAILTYPE_ELECTRIC;
    00593
    00594   /* walk through all train engines */
    00595   Engine *e;
    00596   FOR_ALL_ENGINES_OF_TYPE(e, VEH_TRAIN) {
    00597     RailVehicleInfo *rv_info = &e->u.rail;
    00598     /* if it is an electric rail engine and its railtype is the wrong one */
    00599     if (rv_info->engclass == 2 && rv_info->railtype == old_railtype) {
    00600       /* change it to the proper one */
    00601       rv_info->railtype = new_railtype;
    00602     }
    00603   }
    00604
    00605   /* when disabling elrails, make sure that all existing trains can run on
    00606    *  normal rail too */
    00607   if (disable) {
    00608     FOR_ALL_TRAINS(t) {
    00609       if (t->railtype == RAILTYPE_ELECTRIC) {
    00610         /* this railroad vehicle is now compatible only with elrail,
    00611          *  so add there also normal rail compatibility */
    00612         t->compatible_railtypes |= RAILTYPES_RAIL;
    00613         t->railtype = RAILTYPE_RAIL;
    00614         SetBit(t->flags, VRF_EL_ENGINE_ALLOWED_NORMAL_RAIL);
    00615       }
    00616     }
    00617   }
    00618
    00619   /* Fix the total power and acceleration for trains */
    00620   FOR_ALL_TRAINS(t) {
    00621     /* power and acceleration is cached only for front engines */
    00622     if (t->IsFrontEngine()) {
    00623       t->ConsistChanged(true);
    00624     }
    00625   }
    00626
    00627   FOR_ALL_COMPANIES(c) c->avail_railtypes = GetCompanyRailtypes(c->index);
    00628
    00629   /* This resets the _last_built_railtype, which will be invalid for electric
    00630    * rails. It may have unintended consequences if that function is ever
    00631    * extended, though. */
    00632   ReinitGuiAfterToggleElrail(disable);
    00633   return true;
    00634 }