OpenTTD
elrail.cpp
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1 /* $Id: elrail.cpp 26879 2014-09-21 11:24:51Z rubidium $ */
2 
3 /*
4  * This file is part of OpenTTD.
5  * 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.
6  * 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.
7  * 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/>.
8  */
9 
57 #include "stdafx.h"
58 #include "station_map.h"
59 #include "viewport_func.h"
60 #include "train.h"
61 #include "rail_gui.h"
62 #include "tunnelbridge_map.h"
63 #include "tunnelbridge.h"
64 #include "elrail_func.h"
65 #include "company_base.h"
66 #include "newgrf_railtype.h"
67 
68 #include "table/elrail_data.h"
69 
70 #include "safeguards.h"
71 
77 static inline TLG GetTLG(TileIndex t)
78 {
79  return (TLG)((HasBit(TileX(t), 0) << 1) + HasBit(TileY(t), 0));
80 }
81 
89 {
90  switch (GetTileType(t)) {
91  case MP_RAILWAY:
92  if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
93  switch (GetRailTileType(t)) {
95  return GetTrackBits(t);
96  default:
97  return TRACK_BIT_NONE;
98  }
99  break;
100 
101  case MP_TUNNELBRIDGE:
102  if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
103  if (override != NULL && (IsTunnel(t) || GetTunnelBridgeLength(t, GetOtherBridgeEnd(t)) > 0)) {
104  *override = 1 << GetTunnelBridgeDirection(t);
105  }
107 
108  case MP_ROAD:
109  if (!IsLevelCrossing(t)) return TRACK_BIT_NONE;
110  if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
111  return GetCrossingRailBits(t);
112 
113  case MP_STATION:
114  if (!HasStationRail(t)) return TRACK_BIT_NONE;
115  if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
117 
118  default:
119  return TRACK_BIT_NONE;
120  }
121 }
122 
127 {
128  if (!IsPlainRailTile(t)) return tracks;
129 
130  TrackdirBits neighbour_tdb = TRACKDIR_BIT_NONE;
131  for (DiagDirection d = DIAGDIR_BEGIN; d < DIAGDIR_END; d++) {
132  /* If the neighbour tile is either not electrified or has no tracks that can be reached
133  * from this tile, mark all trackdirs that can be reached from the neighbour tile
134  * as needing no catenary. We make an exception for blocked station tiles with a matching
135  * axis that still display wires to preserve visual continuity. */
136  TileIndex next_tile = TileAddByDiagDir(t, d);
137  RailType rt = GetTileRailType(next_tile);
138  if (rt == INVALID_RAILTYPE || !HasCatenary(rt) ||
140  (!HasStationTileRail(next_tile) || GetRailStationAxis(next_tile) != DiagDirToAxis(d) || !CanStationTileHaveWires(next_tile)))) {
141  neighbour_tdb |= DiagdirReachesTrackdirs(ReverseDiagDir(d));
142  }
143  }
144 
145  /* If the tracks from either a diagonal crossing or don't overlap, both
146  * trackdirs have to be marked to mask the corresponding track bit. Else
147  * one marked trackdir is enough the mask the track bit. */
148  TrackBits mask;
149  if (tracks == TRACK_BIT_CROSS || !TracksOverlap(tracks)) {
150  /* If the tracks form either a diagonal crossing or don't overlap, both
151  * trackdirs have to be marked to mask the corresponding track bit. */
152  mask = ~(TrackBits)((neighbour_tdb & (neighbour_tdb >> 8)) & TRACK_BIT_MASK);
153  /* If that results in no masked tracks and it is not a diagonal crossing,
154  * require only one marked trackdir to mask. */
155  if (tracks != TRACK_BIT_CROSS && (mask & TRACK_BIT_MASK) == TRACK_BIT_MASK) mask = ~TrackdirBitsToTrackBits(neighbour_tdb);
156  } else {
157  /* Require only one marked trackdir to mask the track. */
158  mask = ~TrackdirBitsToTrackBits(neighbour_tdb);
159  /* If that results in an empty set, require both trackdirs for diagonal track. */
160  if ((tracks & mask) == TRACK_BIT_NONE) {
161  if ((neighbour_tdb & TRACKDIR_BIT_X_NE) == 0 || (neighbour_tdb & TRACKDIR_BIT_X_SW) == 0) mask |= TRACK_BIT_X;
162  if ((neighbour_tdb & TRACKDIR_BIT_Y_NW) == 0 || (neighbour_tdb & TRACKDIR_BIT_Y_SE) == 0) mask |= TRACK_BIT_Y;
163  /* If that still is not enough, require both trackdirs for any track. */
164  if ((tracks & mask) == TRACK_BIT_NONE) mask = ~(TrackBits)((neighbour_tdb & (neighbour_tdb >> 8)) & TRACK_BIT_MASK);
165  }
166  }
167 
168  /* Mask the tracks only if at least one track bit would remain. */
169  return (tracks & mask) != TRACK_BIT_NONE ? tracks & mask : tracks;
170 }
171 
175 static inline SpriteID GetWireBase(TileIndex tile, TileContext context = TCX_NORMAL)
176 {
177  const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
178  SpriteID wires = GetCustomRailSprite(rti, tile, RTSG_WIRES, context);
179  return wires == 0 ? SPR_WIRE_BASE : wires;
180 }
181 
185 static inline SpriteID GetPylonBase(TileIndex tile, TileContext context = TCX_NORMAL)
186 {
187  const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
188  SpriteID pylons = GetCustomRailSprite(rti, tile, RTSG_PYLONS, context);
189  return pylons == 0 ? SPR_PYLON_BASE : pylons;
190 }
191 
197 static void AdjustTileh(TileIndex tile, Slope *tileh)
198 {
199  if (IsTileType(tile, MP_TUNNELBRIDGE)) {
200  if (IsTunnel(tile)) {
201  *tileh = SLOPE_STEEP; // XXX - Hack to make tunnel entrances to always have a pylon
202  } else if (*tileh != SLOPE_FLAT) {
203  *tileh = SLOPE_FLAT;
204  } else {
205  *tileh = InclinedSlope(GetTunnelBridgeDirection(tile));
206  }
207  }
208 }
209 
217 static int GetPCPElevation(TileIndex tile, DiagDirection PCPpos)
218 {
219  /* The elevation of the "pylon"-sprite should be the elevation at the PCP.
220  * PCPs are always on a tile edge.
221  *
222  * This position can be outside of the tile, i.e. ?_pcp_offset == TILE_SIZE > TILE_SIZE - 1.
223  * So we have to move it inside the tile, because if the neighboured tile has a foundation,
224  * that does not smoothly connect to the current tile, we will get a wrong elevation from GetSlopePixelZ().
225  *
226  * When we move the position inside the tile, we will get a wrong elevation if we have a slope.
227  * To catch all cases we round the Z position to the next (TILE_HEIGHT / 2).
228  * This will return the correct elevation for slopes and will also detect non-continuous elevation on edges.
229  *
230  * Also note that the result of GetSlopePixelZ() is very special on bridge-ramps.
231  */
232 
233  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));
234  return (z + 2) & ~3; // this means z = (z + TILE_HEIGHT / 4) / (TILE_HEIGHT / 2) * (TILE_HEIGHT / 2);
235 }
236 
245 {
246  /* xmin, ymin, xmax + 1, ymax + 1 of BB */
247  static const int _tunnel_wire_BB[4][4] = {
248  { 0, 1, 16, 15 }, // NE
249  { 1, 0, 15, 16 }, // SE
250  { 0, 1, 16, 15 }, // SW
251  { 1, 0, 15, 16 }, // NW
252  };
253 
255 
256  SpriteID wire_base = GetWireBase(ti->tile);
257 
258  const SortableSpriteStruct *sss = &CatenarySpriteData_Tunnel[dir];
259  const int *BB_data = _tunnel_wire_BB[dir];
261  wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
262  BB_data[2] - sss->x_offset, BB_data[3] - sss->y_offset, BB_Z_SEPARATOR - sss->z_offset + 1,
263  GetTilePixelZ(ti->tile) + sss->z_offset,
265  BB_data[0] - sss->x_offset, BB_data[1] - sss->y_offset, BB_Z_SEPARATOR - sss->z_offset
266  );
267 }
268 
273 static void DrawCatenaryRailway(const TileInfo *ti)
274 {
275  /* Pylons are placed on a tile edge, so we need to take into account
276  * the track configuration of 2 adjacent tiles. trackconfig[0] stores the
277  * current tile (home tile) while [1] holds the neighbour */
278  TrackBits trackconfig[TS_END];
279  TrackBits wireconfig[TS_END];
280  bool isflat[TS_END];
281  /* Note that ti->tileh has already been adjusted for Foundations */
282  Slope tileh[TS_END] = { ti->tileh, SLOPE_FLAT };
283 
284  /* Half tile slopes coincide only with horizontal/vertical track.
285  * Faking a flat slope results in the correct sprites on positions. */
286  Corner halftile_corner = CORNER_INVALID;
287  if (IsHalftileSlope(tileh[TS_HOME])) {
288  halftile_corner = GetHalftileSlopeCorner(tileh[TS_HOME]);
289  tileh[TS_HOME] = SLOPE_FLAT;
290  }
291 
292  TLG tlg = GetTLG(ti->tile);
293  byte PCPstatus = 0;
294  byte OverridePCP = 0;
295  byte PPPpreferred[DIAGDIR_END];
296  byte PPPallowed[DIAGDIR_END];
297 
298  /* Find which rail bits are present, and select the override points.
299  * We don't draw a pylon:
300  * 1) INSIDE a tunnel (we wouldn't see it anyway)
301  * 2) on the "far" end of a bridge head (the one that connects to bridge middle),
302  * because that one is drawn on the bridge. Exception is for length 0 bridges
303  * which have no middle tiles */
304  trackconfig[TS_HOME] = GetRailTrackBitsUniversal(ti->tile, &OverridePCP);
305  wireconfig[TS_HOME] = MaskWireBits(ti->tile, trackconfig[TS_HOME]);
306  /* If a track bit is present that is not in the main direction, the track is level */
307  isflat[TS_HOME] = ((trackconfig[TS_HOME] & (TRACK_BIT_HORZ | TRACK_BIT_VERT)) != 0);
308 
309  AdjustTileh(ti->tile, &tileh[TS_HOME]);
310 
311  SpriteID pylon_normal = GetPylonBase(ti->tile);
312  SpriteID pylon_halftile = (halftile_corner != CORNER_INVALID) ? GetPylonBase(ti->tile, TCX_UPPER_HALFTILE) : pylon_normal;
313 
314  for (DiagDirection i = DIAGDIR_BEGIN; i < DIAGDIR_END; i++) {
315  static const uint edge_corners[] = {
316  1 << CORNER_N | 1 << CORNER_E, // DIAGDIR_NE
317  1 << CORNER_S | 1 << CORNER_E, // DIAGDIR_SE
318  1 << CORNER_S | 1 << CORNER_W, // DIAGDIR_SW
319  1 << CORNER_N | 1 << CORNER_W, // DIAGDIR_NW
320  };
321  SpriteID pylon_base = (halftile_corner != CORNER_INVALID && HasBit(edge_corners[i], halftile_corner)) ? pylon_halftile : pylon_normal;
322  TileIndex neighbour = ti->tile + TileOffsByDiagDir(i);
323  int elevation = GetPCPElevation(ti->tile, i);
324 
325  /* Here's one of the main headaches. GetTileSlope does not correct for possibly
326  * existing foundataions, so we do have to do that manually later on.*/
327  tileh[TS_NEIGHBOUR] = GetTileSlope(neighbour);
328  trackconfig[TS_NEIGHBOUR] = GetRailTrackBitsUniversal(neighbour, NULL);
329  wireconfig[TS_NEIGHBOUR] = MaskWireBits(neighbour, trackconfig[TS_NEIGHBOUR]);
330  if (IsTunnelTile(neighbour) && i != GetTunnelBridgeDirection(neighbour)) wireconfig[TS_NEIGHBOUR] = trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;
331 
332  /* Ignore station tiles that allow neither wires nor pylons. */
333  if (IsRailStationTile(neighbour) && !CanStationTileHavePylons(neighbour) && !CanStationTileHaveWires(neighbour)) wireconfig[TS_NEIGHBOUR] = trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;
334 
335  /* If the neighboured tile does not smoothly connect to the current tile (because of a foundation),
336  * we have to draw all pillars on the current tile. */
337  if (elevation != GetPCPElevation(neighbour, ReverseDiagDir(i))) wireconfig[TS_NEIGHBOUR] = trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;
338 
339  isflat[TS_NEIGHBOUR] = ((trackconfig[TS_NEIGHBOUR] & (TRACK_BIT_HORZ | TRACK_BIT_VERT)) != 0);
340 
341  PPPpreferred[i] = 0xFF; // We start with preferring everything (end-of-line in any direction)
342  PPPallowed[i] = AllowedPPPonPCP[i];
343 
344  /* We cycle through all the existing tracks at a PCP and see what
345  * PPPs we want to have, or may not have at all */
346  for (uint k = 0; k < NUM_TRACKS_AT_PCP; k++) {
347  /* Next to us, we have a bridge head, don't worry about that one, if it shows away from us */
348  if (TrackSourceTile[i][k] == TS_NEIGHBOUR &&
349  IsBridgeTile(neighbour) &&
350  GetTunnelBridgeDirection(neighbour) == ReverseDiagDir(i)) {
351  continue;
352  }
353 
354  /* We check whether the track in question (k) is present in the tile
355  * (TrackSourceTile) */
356  DiagDirection PCPpos = i;
357  if (HasBit(wireconfig[TrackSourceTile[i][k]], TracksAtPCP[i][k])) {
358  /* track found, if track is in the neighbour tile, adjust the number
359  * of the PCP for preferred/allowed determination*/
360  PCPpos = (TrackSourceTile[i][k] == TS_HOME) ? i : ReverseDiagDir(i);
361  SetBit(PCPstatus, i); // This PCP is in use
362  PPPpreferred[i] &= PreferredPPPofTrackAtPCP[TracksAtPCP[i][k]][PCPpos];
363  }
364 
365  if (HasBit(trackconfig[TrackSourceTile[i][k]], TracksAtPCP[i][k])) {
366  PPPallowed[i] &= ~DisallowedPPPofTrackAtPCP[TracksAtPCP[i][k]][PCPpos];
367  }
368  }
369 
370  /* Deactivate all PPPs if PCP is not used */
371  if (!HasBit(PCPstatus, i)) {
372  PPPpreferred[i] = 0;
373  PPPallowed[i] = 0;
374  }
375 
376  Foundation foundation = FOUNDATION_NONE;
377 
378  /* Station and road crossings are always "flat", so adjust the tileh accordingly */
379  if (IsTileType(neighbour, MP_STATION) || IsTileType(neighbour, MP_ROAD)) tileh[TS_NEIGHBOUR] = SLOPE_FLAT;
380 
381  /* Read the foundations if they are present, and adjust the tileh */
382  if (trackconfig[TS_NEIGHBOUR] != TRACK_BIT_NONE && IsTileType(neighbour, MP_RAILWAY) && HasCatenary(GetRailType(neighbour))) foundation = GetRailFoundation(tileh[TS_NEIGHBOUR], trackconfig[TS_NEIGHBOUR]);
383  if (IsBridgeTile(neighbour)) {
384  foundation = GetBridgeFoundation(tileh[TS_NEIGHBOUR], DiagDirToAxis(GetTunnelBridgeDirection(neighbour)));
385  }
386 
387  ApplyFoundationToSlope(foundation, &tileh[TS_NEIGHBOUR]);
388 
389  /* Half tile slopes coincide only with horizontal/vertical track.
390  * Faking a flat slope results in the correct sprites on positions. */
391  if (IsHalftileSlope(tileh[TS_NEIGHBOUR])) tileh[TS_NEIGHBOUR] = SLOPE_FLAT;
392 
393  AdjustTileh(neighbour, &tileh[TS_NEIGHBOUR]);
394 
395  /* If we have a straight (and level) track, we want a pylon only every 2 tiles
396  * Delete the PCP if this is the case.
397  * Level means that the slope is the same, or the track is flat */
398  if (tileh[TS_HOME] == tileh[TS_NEIGHBOUR] || (isflat[TS_HOME] && isflat[TS_NEIGHBOUR])) {
399  for (uint k = 0; k < NUM_IGNORE_GROUPS; k++) {
400  if (PPPpreferred[i] == IgnoredPCP[k][tlg][i]) ClrBit(PCPstatus, i);
401  }
402  }
403 
404  /* Now decide where we draw our pylons. First try the preferred PPPs, but they may not exist.
405  * In that case, we try the any of the allowed ones. if they don't exist either, don't draw
406  * anything. Note that the preferred PPPs still contain the end-of-line markers.
407  * Remove those (simply by ANDing with allowed, since these markers are never allowed) */
408  if ((PPPallowed[i] & PPPpreferred[i]) != 0) PPPallowed[i] &= PPPpreferred[i];
409 
410  if (IsBridgeAbove(ti->tile)) {
411  Track bridgetrack = GetBridgeAxis(ti->tile) == AXIS_X ? TRACK_X : TRACK_Y;
412  int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
413 
414  if ((height <= GetTileMaxZ(ti->tile) + 1) &&
415  (i == PCPpositions[bridgetrack][0] || i == PCPpositions[bridgetrack][1])) {
416  SetBit(OverridePCP, i);
417  }
418  }
419 
420  if (PPPallowed[i] != 0 && HasBit(PCPstatus, i) && !HasBit(OverridePCP, i) &&
422  for (Direction k = DIR_BEGIN; k < DIR_END; k++) {
423  byte temp = PPPorder[i][GetTLG(ti->tile)][k];
424 
425  if (HasBit(PPPallowed[i], temp)) {
426  uint x = ti->x + x_pcp_offsets[i] + x_ppp_offsets[temp];
427  uint y = ti->y + y_pcp_offsets[i] + y_ppp_offsets[temp];
428 
429  /* Don't build the pylon if it would be outside the tile */
430  if (!HasBit(OwnedPPPonPCP[i], temp)) {
431  /* We have a neighbour that will draw it, bail out */
432  if (trackconfig[TS_NEIGHBOUR] != TRACK_BIT_NONE) break;
433  continue; // No neighbour, go looking for a better position
434  }
435 
436  AddSortableSpriteToDraw(pylon_base + pylon_sprites[temp], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE,
437  elevation, IsTransparencySet(TO_CATENARY), -1, -1);
438 
439  break; // We already have drawn a pylon, bail out
440  }
441  }
442  }
443  }
444 
445  /* The wire above the tunnel is drawn together with the tunnel-roof (see DrawCatenaryOnTunnel()) */
446  if (IsTunnelTile(ti->tile)) return;
447 
448  /* Don't draw a wire under a low bridge */
450  int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
451 
452  if (height <= GetTileMaxZ(ti->tile) + 1) return;
453  }
454 
455  /* Don't draw a wire if the station tile does not want any */
456  if (IsRailStationTile(ti->tile) && !CanStationTileHaveWires(ti->tile)) return;
457 
458  SpriteID wire_normal = GetWireBase(ti->tile);
459  SpriteID wire_halftile = (halftile_corner != CORNER_INVALID) ? GetWireBase(ti->tile, TCX_UPPER_HALFTILE) : wire_normal;
460  Track halftile_track;
461  switch (halftile_corner) {
462  case CORNER_W: halftile_track = TRACK_LEFT; break;
463  case CORNER_S: halftile_track = TRACK_LOWER; break;
464  case CORNER_E: halftile_track = TRACK_RIGHT; break;
465  case CORNER_N: halftile_track = TRACK_UPPER; break;
466  default: halftile_track = INVALID_TRACK; break;
467  }
468 
469  /* Drawing of pylons is finished, now draw the wires */
470  Track t;
471  FOR_EACH_SET_TRACK(t, wireconfig[TS_HOME]) {
472  SpriteID wire_base = (t == halftile_track) ? wire_halftile : wire_normal;
473  byte PCPconfig = HasBit(PCPstatus, PCPpositions[t][0]) +
474  (HasBit(PCPstatus, PCPpositions[t][1]) << 1);
475 
476  const SortableSpriteStruct *sss;
477  int tileh_selector = !(tileh[TS_HOME] % 3) * tileh[TS_HOME] / 3; // tileh for the slopes, 0 otherwise
478 
479  assert(PCPconfig != 0); // We have a pylon on neither end of the wire, that doesn't work (since we have no sprites for that)
480  assert(!IsSteepSlope(tileh[TS_HOME]));
481  sss = &CatenarySpriteData[Wires[tileh_selector][t][PCPconfig]];
482 
483  /*
484  * The "wire"-sprite position is inside the tile, i.e. 0 <= sss->?_offset < TILE_SIZE.
485  * Therefore it is safe to use GetSlopePixelZ() for the elevation.
486  * Also note that the result of GetSlopePixelZ() is very special for bridge-ramps.
487  */
488  AddSortableSpriteToDraw(wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
489  sss->x_size, sss->y_size, sss->z_size, GetSlopePixelZ(ti->x + sss->x_offset, ti->y + sss->y_offset) + sss->z_offset,
491  }
492 }
493 
502 {
504  TileIndex start = GetOtherBridgeEnd(end);
505 
506  uint length = GetTunnelBridgeLength(start, end);
507  uint num = GetTunnelBridgeLength(ti->tile, start) + 1;
508  uint height;
509 
510  const SortableSpriteStruct *sss;
511  Axis axis = GetBridgeAxis(ti->tile);
512  TLG tlg = GetTLG(ti->tile);
513 
514  CatenarySprite offset = (CatenarySprite)(axis == AXIS_X ? 0 : WIRE_Y_FLAT_BOTH - WIRE_X_FLAT_BOTH);
515 
516  if ((length % 2) && num == length) {
517  /* Draw the "short" wire on the southern end of the bridge
518  * only needed if the length of the bridge is odd */
519  sss = &CatenarySpriteData[WIRE_X_FLAT_BOTH + offset];
520  } else {
521  /* Draw "long" wires on all other tiles of the bridge (one pylon every two tiles) */
522  sss = &CatenarySpriteData[WIRE_X_FLAT_SW + (num % 2) + offset];
523  }
524 
525  height = GetBridgePixelHeight(end);
526 
527  SpriteID wire_base = GetWireBase(end, TCX_ON_BRIDGE);
528 
529  AddSortableSpriteToDraw(wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
530  sss->x_size, sss->y_size, sss->z_size, height + sss->z_offset,
532  );
533 
534  SpriteID pylon_base = GetPylonBase(end, TCX_ON_BRIDGE);
535 
536  /* Finished with wires, draw pylons
537  * every other tile needs a pylon on the northern end */
538  if (num % 2) {
539  DiagDirection PCPpos = (axis == AXIS_X ? DIAGDIR_NE : DIAGDIR_NW);
540  Direction PPPpos = (axis == AXIS_X ? DIR_NW : DIR_NE);
541  if (HasBit(tlg, (axis == AXIS_X ? 0 : 1))) PPPpos = ReverseDir(PPPpos);
542  uint x = ti->x + x_pcp_offsets[PCPpos] + x_ppp_offsets[PPPpos];
543  uint y = ti->y + y_pcp_offsets[PCPpos] + y_ppp_offsets[PPPpos];
544  AddSortableSpriteToDraw(pylon_base + pylon_sprites[PPPpos], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, height, IsTransparencySet(TO_CATENARY), -1, -1);
545  }
546 
547  /* need a pylon on the southern end of the bridge */
548  if (GetTunnelBridgeLength(ti->tile, start) + 1 == length) {
549  DiagDirection PCPpos = (axis == AXIS_X ? DIAGDIR_SW : DIAGDIR_SE);
550  Direction PPPpos = (axis == AXIS_X ? DIR_NW : DIR_NE);
551  if (HasBit(tlg, (axis == AXIS_X ? 0 : 1))) PPPpos = ReverseDir(PPPpos);
552  uint x = ti->x + x_pcp_offsets[PCPpos] + x_ppp_offsets[PPPpos];
553  uint y = ti->y + y_pcp_offsets[PCPpos] + y_ppp_offsets[PPPpos];
554  AddSortableSpriteToDraw(pylon_base + pylon_sprites[PPPpos], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, height, IsTransparencySet(TO_CATENARY), -1, -1);
555  }
556 }
557 
563 void DrawCatenary(const TileInfo *ti)
564 {
565  switch (GetTileType(ti->tile)) {
566  case MP_RAILWAY:
567  if (IsRailDepot(ti->tile)) {
568  const SortableSpriteStruct *sss = &CatenarySpriteData_Depot[GetRailDepotDirection(ti->tile)];
569 
570  SpriteID wire_base = GetWireBase(ti->tile);
571 
572  /* This wire is not visible with the default depot sprites */
574  wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
575  sss->x_size, sss->y_size, sss->z_size,
576  GetTileMaxPixelZ(ti->tile) + sss->z_offset,
578  );
579  return;
580  }
581  break;
582 
583  case MP_TUNNELBRIDGE:
584  case MP_ROAD:
585  case MP_STATION:
586  break;
587 
588  default: return;
589  }
591 }
592 
593 bool SettingsDisableElrail(int32 p1)
594 {
595  Company *c;
596  Train *t;
597  bool disable = (p1 != 0);
598 
599  /* we will now walk through all electric train engines and change their railtypes if it is the wrong one*/
600  const RailType old_railtype = disable ? RAILTYPE_ELECTRIC : RAILTYPE_RAIL;
601  const RailType new_railtype = disable ? RAILTYPE_RAIL : RAILTYPE_ELECTRIC;
602 
603  /* walk through all train engines */
604  Engine *e;
605  FOR_ALL_ENGINES_OF_TYPE(e, VEH_TRAIN) {
606  RailVehicleInfo *rv_info = &e->u.rail;
607  /* if it is an electric rail engine and its railtype is the wrong one */
608  if (rv_info->engclass == 2 && rv_info->railtype == old_railtype) {
609  /* change it to the proper one */
610  rv_info->railtype = new_railtype;
611  }
612  }
613 
614  /* when disabling elrails, make sure that all existing trains can run on
615  * normal rail too */
616  if (disable) {
617  FOR_ALL_TRAINS(t) {
618  if (t->railtype == RAILTYPE_ELECTRIC) {
619  /* this railroad vehicle is now compatible only with elrail,
620  * so add there also normal rail compatibility */
621  t->compatible_railtypes |= RAILTYPES_RAIL;
622  t->railtype = RAILTYPE_RAIL;
624  }
625  }
626  }
627 
628  /* Fix the total power and acceleration for trains */
629  FOR_ALL_TRAINS(t) {
630  /* power and acceleration is cached only for front engines */
631  if (t->IsFrontEngine()) {
633  }
634  }
635 
636  FOR_ALL_COMPANIES(c) c->avail_railtypes = GetCompanyRailtypes(c->index);
637 
638  /* This resets the _last_built_railtype, which will be invalid for electric
639  * rails. It may have unintended consequences if that function is ever
640  * extended, though. */
642  return true;
643 }