# 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
    00070 static inline TLG GetTLG(TileIndex t)
    00071 {
    00072   return (TLG)((HasBit(TileX(t), 0) << 1) + HasBit(TileY(t), 0));
    00073 }
    00074
    00081 static TrackBits GetRailTrackBitsUniversal(TileIndex t, byte *override)
    00082 {
    00083   switch (GetTileType(t)) {
    00084     case MP_RAILWAY:
    00085       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
    00086       switch (GetRailTileType(t)) {
    00087         case RAIL_TILE_NORMAL: case RAIL_TILE_SIGNALS:
    00088           return GetTrackBits(t);
    00089         default:
    00090           return TRACK_BIT_NONE;
    00091       }
    00092       break;
    00093
    00094     case MP_TUNNELBRIDGE:
    00095       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
    00096       if (override != NULL && (IsTunnel(t) || GetTunnelBridgeLength(t, GetOtherBridgeEnd(t)) > 0)) {
    00097         *override = 1 << GetTunnelBridgeDirection(t);
    00098       }
    00099       return DiagDirToDiagTrackBits(GetTunnelBridgeDirection(t));
    00100
    00101     case MP_ROAD:
    00102       if (!IsLevelCrossing(t)) return TRACK_BIT_NONE;
    00103       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
    00104       return GetCrossingRailBits(t);
    00105
    00106     case MP_STATION:
    00107       if (!HasStationRail(t)) return TRACK_BIT_NONE;
    00108       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
    00109       if (!IsStationTileElectrifiable(t)) return TRACK_BIT_NONE;
    00110       return TrackToTrackBits(GetRailStationTrack(t));
    00111
    00112     default:
    00113       return TRACK_BIT_NONE;
    00114   }
    00115 }
    00116
    00120 static TrackBits MaskWireBits(TileIndex t, TrackBits tracks)
    00121 {
    00122   if (!IsPlainRailTile(t)) return tracks;
    00123
    00124   TrackdirBits neighbour_tdb = TRACKDIR_BIT_NONE;
    00125   for (DiagDirection d = DIAGDIR_BEGIN; d < DIAGDIR_END; d++) {
    00126     /* If the neighbor tile is either not electrified or has no tracks that can be reached
    00127      * from this tile, mark all trackdirs that can be reached from the neighbour tile
    00128      * as needing no catenary. */
    00129     RailType rt = GetTileRailType(TileAddByDiagDir(t, d));
    00130     if (rt == INVALID_RAILTYPE || !HasCatenary(rt) || (TrackStatusToTrackBits(GetTileTrackStatus(TileAddByDiagDir(t, d), TRANSPORT_RAIL, 0)) & DiagdirReachesTracks(d)) == TRACK_BIT_NONE) {
    00131       neighbour_tdb |= DiagdirReachesTrackdirs(ReverseDiagDir(d));
    00132     }
    00133   }
    00134
    00135   /* If the tracks from either a diagonal crossing or don't overlap, both
    00136    * trackdirs have to be marked to mask the corresponding track bit. Else
    00137    * one marked trackdir is enough the mask the track bit. */
    00138   TrackBits mask;
    00139   if (tracks == TRACK_BIT_CROSS || !TracksOverlap(tracks)) {
    00140     /* If the tracks form either a diagonal crossing or don't overlap, both
    00141      * trackdirs have to be marked to mask the corresponding track bit. */
    00142     mask = ~(TrackBits)((neighbour_tdb & (neighbour_tdb >> 8)) & TRACK_BIT_MASK);
    00143     /* If that results in no masked tracks and it is not a diagonal crossing,
    00144      * require only one marked trackdir to mask. */
    00145     if (tracks != TRACK_BIT_CROSS && (mask & TRACK_BIT_MASK) == TRACK_BIT_MASK) mask = ~TrackdirBitsToTrackBits(neighbour_tdb);
    00146   } else {
    00147     /* Require only one marked trackdir to mask the track. */
    00148     mask = ~TrackdirBitsToTrackBits(neighbour_tdb);
    00149     /* If that results in an empty set, require both trackdirs for diagonal track. */
    00150     if ((tracks & mask) == TRACK_BIT_NONE) {
    00151       if ((neighbour_tdb & TRACKDIR_BIT_X_NE) == 0 || (neighbour_tdb & TRACKDIR_BIT_X_SW) == 0) mask |= TRACK_BIT_X;
    00152       if ((neighbour_tdb & TRACKDIR_BIT_Y_NW) == 0 || (neighbour_tdb & TRACKDIR_BIT_Y_SE) == 0) mask |= TRACK_BIT_Y;
    00153       /* If that still is not enough, require both trackdirs for any track. */
    00154       if ((tracks & mask) == TRACK_BIT_NONE) mask = ~(TrackBits)((neighbour_tdb & (neighbour_tdb >> 8)) & TRACK_BIT_MASK);
    00155     }
    00156   }
    00157
    00158   /* Mask the tracks only if at least one track bit would remain. */
    00159   return (tracks & mask) != TRACK_BIT_NONE ? tracks & mask : tracks;
    00160 }
    00161
    00165 static inline SpriteID GetWireBase(TileIndex tile, TileContext context = TCX_NORMAL)
    00166 {
    00167   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
    00168   SpriteID wires = GetCustomRailSprite(rti, tile, RTSG_WIRES, context);
    00169   return wires == 0 ? SPR_WIRE_BASE : wires;
    00170 }
    00171
    00175 static inline SpriteID GetPylonBase(TileIndex tile, TileContext context = TCX_NORMAL)
    00176 {
    00177   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
    00178   SpriteID pylons = GetCustomRailSprite(rti, tile, RTSG_PYLONS, context);
    00179   return pylons == 0 ? SPR_PYLON_BASE : pylons;
    00180 }
    00181
    00187 static void AdjustTileh(TileIndex tile, Slope *tileh)
    00188 {
    00189   if (IsTileType(tile, MP_TUNNELBRIDGE)) {
    00190     if (IsTunnel(tile)) {
    00191       *tileh = SLOPE_STEEP; // XXX - Hack to make tunnel entrances to always have a pylon
    00192     } else if (*tileh != SLOPE_FLAT) {
    00193       *tileh = SLOPE_FLAT;
    00194     } else {
    00195       *tileh = InclinedSlope(GetTunnelBridgeDirection(tile));
    00196     }
    00197   }
    00198 }
    00199
    00207 static byte GetPCPElevation(TileIndex tile, DiagDirection PCPpos)
    00208 {
    00209   /* The elevation of the "pylon"-sprite should be the elevation at the PCP.
    00210    * PCPs are always on a tile edge.
    00211    *
    00212    * This position can be outside of the tile, i.e. ?_pcp_offset == TILE_SIZE > TILE_SIZE - 1.
    00213    * So we have to move it inside the tile, because if the neighboured tile has a foundation,
    00214    * that does not smoothly connect to the current tile, we will get a wrong elevation from GetSlopeZ().
    00215    *
    00216    * When we move the position inside the tile, we will get a wrong elevation if we have a slope.
    00217    * To catch all cases we round the Z position to the next (TILE_HEIGHT / 2).
    00218    * This will return the correct elevation for slopes and will also detect non-continuous elevation on edges.
    00219    *
    00220    * Also note that the result of GetSlopeZ() is very special on bridge-ramps.
    00221    */
    00222
    00223   byte z = GetSlopeZ(TileX(tile) * TILE_SIZE + min(x_pcp_offsets[PCPpos], TILE_SIZE - 1), TileY(tile) * TILE_SIZE + min(y_pcp_offsets[PCPpos], TILE_SIZE - 1));
    00224   return (z + 2) & ~3; // this means z = (z + TILE_HEIGHT / 4) / (TILE_HEIGHT / 2) * (TILE_HEIGHT / 2);
    00225 }
    00226
    00234 void DrawCatenaryOnTunnel(const TileInfo *ti)
    00235 {
    00236   /* xmin, ymin, xmax + 1, ymax + 1 of BB */
    00237   static const int _tunnel_wire_BB[4][4] = {
    00238     { 0, 1, 16, 15 }, // NE
    00239     { 1, 0, 15, 16 }, // SE
    00240     { 0, 1, 16, 15 }, // SW
    00241     { 1, 0, 15, 16 }, // NW
    00242   };
    00243
    00244   DiagDirection dir = GetTunnelBridgeDirection(ti->tile);
    00245
    00246   SpriteID wire_base = GetWireBase(ti->tile);
    00247
    00248   const SortableSpriteStruct *sss = &CatenarySpriteData_Tunnel[dir];
    00249   const int *BB_data = _tunnel_wire_BB[dir];
    00250   AddSortableSpriteToDraw(
    00251     wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
    00252     BB_data[2] - sss->x_offset, BB_data[3] - sss->y_offset, BB_Z_SEPARATOR - sss->z_offset + 1,
    00253     GetTileZ(ti->tile) + sss->z_offset,
    00254     IsTransparencySet(TO_CATENARY),
    00255     BB_data[0] - sss->x_offset, BB_data[1] - sss->y_offset, BB_Z_SEPARATOR - sss->z_offset
    00256   );
    00257 }
    00258
    00263 static void DrawCatenaryRailway(const TileInfo *ti)
    00264 {
    00265   /* Pylons are placed on a tile edge, so we need to take into account
    00266    * the track configuration of 2 adjacent tiles. trackconfig[0] stores the
    00267    * current tile (home tile) while [1] holds the neighbour */
    00268   TrackBits trackconfig[TS_END];
    00269   TrackBits wireconfig[TS_END];
    00270   bool isflat[TS_END];
    00271   /* Note that ti->tileh has already been adjusted for Foundations */
    00272   Slope tileh[TS_END] = { ti->tileh, SLOPE_FLAT };
    00273
    00274   /* Half tile slopes coincide only with horizontal/vertical track.
    00275    * Faking a flat slope results in the correct sprites on positions. */
    00276   Corner halftile_corner = CORNER_INVALID;
    00277   if (IsHalftileSlope(tileh[TS_HOME])) {
    00278     halftile_corner = GetHalftileSlopeCorner(tileh[TS_HOME]);
    00279     tileh[TS_HOME] = SLOPE_FLAT;
    00280   }
    00281
    00282   TLG tlg = GetTLG(ti->tile);
    00283   byte PCPstatus = 0;
    00284   byte OverridePCP = 0;
    00285   byte PPPpreferred[DIAGDIR_END];
    00286   byte PPPallowed[DIAGDIR_END];
    00287
    00288   /* Find which rail bits are present, and select the override points.
    00289    * We don't draw a pylon:
    00290    * 1) INSIDE a tunnel (we wouldn't see it anyway)
    00291    * 2) on the "far" end of a bridge head (the one that connects to bridge middle),
    00292    *    because that one is drawn on the bridge. Exception is for length 0 bridges
    00293    *    which have no middle tiles */
    00294   trackconfig[TS_HOME] = GetRailTrackBitsUniversal(ti->tile, &OverridePCP);
    00295   wireconfig[TS_HOME] = MaskWireBits(ti->tile, trackconfig[TS_HOME]);
    00296   /* If a track bit is present that is not in the main direction, the track is level */
    00297   isflat[TS_HOME] = ((trackconfig[TS_HOME] & (TRACK_BIT_HORZ | TRACK_BIT_VERT)) != 0);
    00298
    00299   AdjustTileh(ti->tile, &tileh[TS_HOME]);
    00300
    00301   SpriteID pylon_normal = GetPylonBase(ti->tile);
    00302   SpriteID pylon_halftile = (halftile_corner != CORNER_INVALID) ? GetPylonBase(ti->tile, TCX_UPPER_HALFTILE) : pylon_normal;
    00303
    00304   for (DiagDirection i = DIAGDIR_BEGIN; i < DIAGDIR_END; i++) {
    00305     static const uint edge_corners[] = {
    00306       1 << CORNER_N | 1 << CORNER_E, // DIAGDIR_NE
    00307       1 << CORNER_S | 1 << CORNER_E, // DIAGDIR_SE
    00308       1 << CORNER_S | 1 << CORNER_W, // DIAGDIR_SW
    00309       1 << CORNER_N | 1 << CORNER_W, // DIAGDIR_NW
    00310     };
    00311     SpriteID pylon_base = (halftile_corner != CORNER_INVALID && HasBit(edge_corners[i], halftile_corner)) ? pylon_halftile : pylon_normal;
    00312     TileIndex neighbour = ti->tile + TileOffsByDiagDir(i);
    00313     Foundation foundation = FOUNDATION_NONE;
    00314     byte elevation = GetPCPElevation(ti->tile, i);
    00315
    00316     /* Here's one of the main headaches. GetTileSlope does not correct for possibly
    00317      * existing foundataions, so we do have to do that manually later on.*/
    00318     tileh[TS_NEIGHBOUR] = GetTileSlope(neighbour, NULL);
    00319     trackconfig[TS_NEIGHBOUR] = GetRailTrackBitsUniversal(neighbour, NULL);
    00320     wireconfig[TS_NEIGHBOUR] = MaskWireBits(neighbour, trackconfig[TS_NEIGHBOUR]);
    00321     if (IsTunnelTile(neighbour) && i != GetTunnelBridgeDirection(neighbour)) wireconfig[TS_NEIGHBOUR] = trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;
    00322
    00323     /* If the neighboured tile does not smoothly connect to the current tile (because of a foundation),
    00324      * we have to draw all pillars on the current tile. */
    00325     if (elevation != GetPCPElevation(neighbour, ReverseDiagDir(i))) wireconfig[TS_NEIGHBOUR] = trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;
    00326
    00327     isflat[TS_NEIGHBOUR] = ((trackconfig[TS_NEIGHBOUR] & (TRACK_BIT_HORZ | TRACK_BIT_VERT)) != 0);
    00328
    00329     PPPpreferred[i] = 0xFF; // We start with preferring everything (end-of-line in any direction)
    00330     PPPallowed[i] = AllowedPPPonPCP[i];
    00331
    00332     /* We cycle through all the existing tracks at a PCP and see what
    00333      * PPPs we want to have, or may not have at all */
    00334     for (uint k = 0; k < NUM_TRACKS_AT_PCP; k++) {
    00335       /* Next to us, we have a bridge head, don't worry about that one, if it shows away from us */
    00336       if (TrackSourceTile[i][k] == TS_NEIGHBOUR &&
    00337           IsBridgeTile(neighbour) &&
    00338           GetTunnelBridgeDirection(neighbour) == ReverseDiagDir(i)) {
    00339         continue;
    00340       }
    00341
    00342       /* We check whether the track in question (k) is present in the tile
    00343        * (TrackSourceTile) */
    00344       DiagDirection PCPpos = i;
    00345       if (HasBit(wireconfig[TrackSourceTile[i][k]], TracksAtPCP[i][k])) {
    00346         /* track found, if track is in the neighbour tile, adjust the number
    00347          * of the PCP for preferred/allowed determination*/
    00348         PCPpos = (TrackSourceTile[i][k] == TS_HOME) ? i : ReverseDiagDir(i);
    00349         SetBit(PCPstatus, i); // This PCP is in use
    00350         PPPpreferred[i] &= PreferredPPPofTrackAtPCP[TracksAtPCP[i][k]][PCPpos];
    00351       }
    00352
    00353       if (HasBit(trackconfig[TrackSourceTile[i][k]], TracksAtPCP[i][k])) {
    00354         PPPallowed[i] &= ~DisallowedPPPofTrackAtPCP[TracksAtPCP[i][k]][PCPpos];
    00355       }
    00356     }
    00357
    00358     /* Deactivate all PPPs if PCP is not used */
    00359     if (!HasBit(PCPstatus, i)) {
    00360       PPPpreferred[i] = 0;
    00361       PPPallowed[i] = 0;
    00362     }
    00363
    00364     /* A station is always "flat", so adjust the tileh accordingly */
    00365     if (IsTileType(neighbour, MP_STATION)) tileh[TS_NEIGHBOUR] = SLOPE_FLAT;
    00366
    00367     /* Read the foundataions if they are present, and adjust the tileh */
    00368     if (trackconfig[TS_NEIGHBOUR] != TRACK_BIT_NONE && IsTileType(neighbour, MP_RAILWAY) && HasCatenary(GetRailType(neighbour))) foundation = GetRailFoundation(tileh[TS_NEIGHBOUR], trackconfig[TS_NEIGHBOUR]);
    00369     if (IsBridgeTile(neighbour)) {
    00370       foundation = GetBridgeFoundation(tileh[TS_NEIGHBOUR], DiagDirToAxis(GetTunnelBridgeDirection(neighbour)));
    00371     }
    00372
    00373     ApplyFoundationToSlope(foundation, &tileh[TS_NEIGHBOUR]);
    00374
    00375     /* Half tile slopes coincide only with horizontal/vertical track.
    00376      * Faking a flat slope results in the correct sprites on positions. */
    00377     if (IsHalftileSlope(tileh[TS_NEIGHBOUR])) tileh[TS_NEIGHBOUR] = SLOPE_FLAT;
    00378
    00379     AdjustTileh(neighbour, &tileh[TS_NEIGHBOUR]);
    00380
    00381     /* If we have a straight (and level) track, we want a pylon only every 2 tiles
    00382      * Delete the PCP if this is the case.
    00383      * Level means that the slope is the same, or the track is flat */
    00384     if (tileh[TS_HOME] == tileh[TS_NEIGHBOUR] || (isflat[TS_HOME] && isflat[TS_NEIGHBOUR])) {
    00385       for (uint k = 0; k < NUM_IGNORE_GROUPS; k++) {
    00386         if (PPPpreferred[i] == IgnoredPCP[k][tlg][i]) ClrBit(PCPstatus, i);
    00387       }
    00388     }
    00389
    00390     /* Now decide where we draw our pylons. First try the preferred PPPs, but they may not exist.
    00391      * In that case, we try the any of the allowed ones. if they don't exist either, don't draw
    00392      * anything. Note that the preferred PPPs still contain the end-of-line markers.
    00393      * Remove those (simply by ANDing with allowed, since these markers are never allowed) */
    00394     if ((PPPallowed[i] & PPPpreferred[i]) != 0) PPPallowed[i] &= PPPpreferred[i];
    00395
    00396     if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile)) {
    00397       Track bridgetrack = GetBridgeAxis(ti->tile) == AXIS_X ? TRACK_X : TRACK_Y;
    00398       uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
    00399
    00400       if ((height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) &&
    00401           (i == PCPpositions[bridgetrack][0] || i == PCPpositions[bridgetrack][1])) {
    00402         SetBit(OverridePCP, i);
    00403       }
    00404     }
    00405
    00406     if (PPPallowed[i] != 0 && HasBit(PCPstatus, i) && !HasBit(OverridePCP, i)) {
    00407       for (Direction k = DIR_BEGIN; k < DIR_END; k++) {
    00408         byte temp = PPPorder[i][GetTLG(ti->tile)][k];
    00409
    00410         if (HasBit(PPPallowed[i], temp)) {
    00411           uint x  = ti->x + x_pcp_offsets[i] + x_ppp_offsets[temp];
    00412           uint y  = ti->y + y_pcp_offsets[i] + y_ppp_offsets[temp];
    00413
    00414           /* Don't build the pylon if it would be outside the tile */
    00415           if (!HasBit(OwnedPPPonPCP[i], temp)) {
    00416             /* We have a neighour that will draw it, bail out */
    00417             if (trackconfig[TS_NEIGHBOUR] != TRACK_BIT_NONE) break;
    00418             continue; // No neighbour, go looking for a better position
    00419           }
    00420
    00421           AddSortableSpriteToDraw(pylon_base + pylon_sprites[temp], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE + 5,
    00422             elevation, IsTransparencySet(TO_CATENARY), -1, -1);
    00423
    00424           break; // We already have drawn a pylon, bail out
    00425         }
    00426       }
    00427     }
    00428   }
    00429
    00430   /* The wire above the tunnel is drawn together with the tunnel-roof (see DrawCatenaryOnTunnel()) */
    00431   if (IsTunnelTile(ti->tile)) return;
    00432
    00433   /* Don't draw a wire under a low bridge */
    00434   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_CATENARY)) {
    00435     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
    00436
    00437     if (height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) return;
    00438   }
    00439
    00440   SpriteID wire_normal = GetWireBase(ti->tile);
    00441   SpriteID wire_halftile = (halftile_corner != CORNER_INVALID) ? GetWireBase(ti->tile, TCX_UPPER_HALFTILE) : wire_normal;
    00442   Track halftile_track;
    00443   switch (halftile_corner) {
    00444     case CORNER_W: halftile_track = TRACK_LEFT; break;
    00445     case CORNER_S: halftile_track = TRACK_LOWER; break;
    00446     case CORNER_E: halftile_track = TRACK_RIGHT; break;
    00447     case CORNER_N: halftile_track = TRACK_UPPER; break;
    00448     default:       halftile_track = INVALID_TRACK; break;
    00449   }
    00450
    00451   /* Drawing of pylons is finished, now draw the wires */
    00452   Track t;
    00453   FOR_EACH_SET_TRACK(t, wireconfig[TS_HOME]) {
    00454     SpriteID wire_base = (t == halftile_track) ? wire_halftile : wire_normal;
    00455     byte PCPconfig = HasBit(PCPstatus, PCPpositions[t][0]) +
    00456       (HasBit(PCPstatus, PCPpositions[t][1]) << 1);
    00457
    00458     const SortableSpriteStruct *sss;
    00459     int tileh_selector = !(tileh[TS_HOME] % 3) * tileh[TS_HOME] / 3; // tileh for the slopes, 0 otherwise
    00460
    00461     assert(PCPconfig != 0); // We have a pylon on neither end of the wire, that doesn't work (since we have no sprites for that)
    00462     assert(!IsSteepSlope(tileh[TS_HOME]));
    00463     sss = &CatenarySpriteData[Wires[tileh_selector][t][PCPconfig]];
    00464
    00465     /*
    00466      * The "wire"-sprite position is inside the tile, i.e. 0 <= sss->?_offset < TILE_SIZE.
    00467      * Therefore it is safe to use GetSlopeZ() for the elevation.
    00468      * Also note that the result of GetSlopeZ() is very special for bridge-ramps.
    00469      */
    00470     AddSortableSpriteToDraw(wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
    00471       sss->x_size, sss->y_size, sss->z_size, GetSlopeZ(ti->x + sss->x_offset, ti->y + sss->y_offset) + sss->z_offset,
    00472       IsTransparencySet(TO_CATENARY));
    00473   }
    00474 }
    00475
    00483 void DrawCatenaryOnBridge(const TileInfo *ti)
    00484 {
    00485   TileIndex end = GetSouthernBridgeEnd(ti->tile);
    00486   TileIndex start = GetOtherBridgeEnd(end);
    00487
    00488   uint length = GetTunnelBridgeLength(start, end);
    00489   uint num = GetTunnelBridgeLength(ti->tile, start) + 1;
    00490   uint height;
    00491
    00492   const SortableSpriteStruct *sss;
    00493   Axis axis = GetBridgeAxis(ti->tile);
    00494   TLG tlg = GetTLG(ti->tile);
    00495
    00496   CatenarySprite offset = (CatenarySprite)(axis == AXIS_X ? 0 : WIRE_Y_FLAT_BOTH - WIRE_X_FLAT_BOTH);
    00497
    00498   if ((length % 2) && num == length) {
    00499     /* Draw the "short" wire on the southern end of the bridge
    00500      * only needed if the length of the bridge is odd */
    00501     sss = &CatenarySpriteData[WIRE_X_FLAT_BOTH + offset];
    00502   } else {
    00503     /* Draw "long" wires on all other tiles of the bridge (one pylon every two tiles) */
    00504     sss = &CatenarySpriteData[WIRE_X_FLAT_SW + (num % 2) + offset];
    00505   }
    00506
    00507   height = GetBridgeHeight(end);
    00508
    00509   SpriteID wire_base = GetWireBase(end, TCX_ON_BRIDGE);
    00510
    00511   AddSortableSpriteToDraw(wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
    00512     sss->x_size, sss->y_size, sss->z_size, height + sss->z_offset,
    00513     IsTransparencySet(TO_CATENARY)
    00514   );
    00515
    00516   SpriteID pylon_base = GetPylonBase(end, TCX_ON_BRIDGE);
    00517
    00518   /* Finished with wires, draw pylons
    00519    * every other tile needs a pylon on the northern end */
    00520   if (num % 2) {
    00521     DiagDirection PCPpos = (axis == AXIS_X ? DIAGDIR_NE : DIAGDIR_NW);
    00522     Direction PPPpos = (axis == AXIS_X ? DIR_NW : DIR_NE);
    00523     if (HasBit(tlg, (axis == AXIS_X ? 0 : 1))) PPPpos = ReverseDir(PPPpos);
    00524     uint x = ti->x + x_pcp_offsets[PCPpos] + x_ppp_offsets[PPPpos];
    00525     uint y = ti->y + y_pcp_offsets[PCPpos] + y_ppp_offsets[PPPpos];
    00526     AddSortableSpriteToDraw(pylon_base + pylon_sprites[PPPpos], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, height, IsTransparencySet(TO_CATENARY), -1, -1);
    00527   }
    00528
    00529   /* need a pylon on the southern end of the bridge */
    00530   if (GetTunnelBridgeLength(ti->tile, start) + 1 == length) {
    00531     DiagDirection PCPpos = (axis == AXIS_X ? DIAGDIR_SW : DIAGDIR_SE);
    00532     Direction PPPpos = (axis == AXIS_X ? DIR_NW : DIR_NE);
    00533     if (HasBit(tlg, (axis == AXIS_X ? 0 : 1))) PPPpos = ReverseDir(PPPpos);
    00534     uint x = ti->x + x_pcp_offsets[PCPpos] + x_ppp_offsets[PPPpos];
    00535     uint y = ti->y + y_pcp_offsets[PCPpos] + y_ppp_offsets[PPPpos];
    00536     AddSortableSpriteToDraw(pylon_base + pylon_sprites[PPPpos], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, height, IsTransparencySet(TO_CATENARY), -1, -1);
    00537   }
    00538 }
    00539
    00545 void DrawCatenary(const TileInfo *ti)
    00546 {
    00547   switch (GetTileType(ti->tile)) {
    00548     case MP_RAILWAY:
    00549       if (IsRailDepot(ti->tile)) {
    00550         const SortableSpriteStruct *sss = &CatenarySpriteData_Depot[GetRailDepotDirection(ti->tile)];
    00551
    00552         SpriteID wire_base = GetWireBase(ti->tile);
    00553
    00554         /* This wire is not visible with the default depot sprites */
    00555         AddSortableSpriteToDraw(
    00556           wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
    00557           sss->x_size, sss->y_size, sss->z_size,
    00558           GetTileMaxZ(ti->tile) + sss->z_offset,
    00559           IsTransparencySet(TO_CATENARY)
    00560         );
    00561         return;
    00562       }
    00563       break;
    00564
    00565     case MP_TUNNELBRIDGE:
    00566     case MP_ROAD:
    00567     case MP_STATION:
    00568       break;
    00569
    00570     default: return;
    00571   }
    00572   DrawCatenaryRailway(ti);
    00573 }
    00574
    00575 bool SettingsDisableElrail(int32 p1)
    00576 {
    00577   Company *c;
    00578   Train *t;
    00579   bool disable = (p1 != 0);
    00580
    00581   /* we will now walk through all electric train engines and change their railtypes if it is the wrong one*/
    00582   const RailType old_railtype = disable ? RAILTYPE_ELECTRIC : RAILTYPE_RAIL;
    00583   const RailType new_railtype = disable ? RAILTYPE_RAIL : RAILTYPE_ELECTRIC;
    00584
    00585   /* walk through all train engines */
    00586   Engine *e;
    00587   FOR_ALL_ENGINES_OF_TYPE(e, VEH_TRAIN) {
    00588     RailVehicleInfo *rv_info = &e->u.rail;
    00589     /* if it is an electric rail engine and its railtype is the wrong one */
    00590     if (rv_info->engclass == 2 && rv_info->railtype == old_railtype) {
    00591       /* change it to the proper one */
    00592       rv_info->railtype = new_railtype;
    00593     }
    00594   }
    00595
    00596   /* when disabling elrails, make sure that all existing trains can run on
    00597    *  normal rail too */
    00598   if (disable) {
    00599     FOR_ALL_TRAINS(t) {
    00600       if (t->railtype == RAILTYPE_ELECTRIC) {
    00601         /* this railroad vehicle is now compatible only with elrail,
    00602          *  so add there also normal rail compatibility */
    00603         t->compatible_railtypes |= RAILTYPES_RAIL;
    00604         t->railtype = RAILTYPE_RAIL;
    00605         SetBit(t->flags, VRF_EL_ENGINE_ALLOWED_NORMAL_RAIL);
    00606       }
    00607     }
    00608   }
    00609
    00610   /* Fix the total power and acceleration for trains */
    00611   FOR_ALL_TRAINS(t) {
    00612     /* power and acceleration is cached only for front engines */
    00613     if (t->IsFrontEngine()) {
    00614       t->ConsistChanged(true);
    00615     }
    00616   }
    00617
    00618   FOR_ALL_COMPANIES(c) c->avail_railtypes = GetCompanyRailtypes(c->index);
    00619
    00620   /* This resets the _last_built_railtype, which will be invalid for electric
    00621    * rails. It may have unintended consequences if that function is ever
    00622    * extended, though. */
    00623   ReinitGuiAfterToggleElrail(disable);
    00624   return true;
    00625 }