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OpenTTD/src/elrail.cpp

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/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/**
* @file elrail.cpp
* This file deals with displaying wires and pylons for electric railways.
* <h2>Basics</h2>
*
* <h3>Tile Types</h3>
*
* We have two different types of tiles in the drawing code:
* Normal Railway Tiles (NRTs) which can have more than one track on it, and
* Special Railways tiles (SRTs) which have only one track (like crossings, depots
* stations, etc).
*
* <h3>Location Categories</h3>
*
* All tiles are categorized into three location groups (TLG):
* Group 0: Tiles with both an even X coordinate and an even Y coordinate
* Group 1: Tiles with an even X and an odd Y coordinate
* Group 2: Tiles with an odd X and an even Y coordinate
* Group 3: Tiles with both an odd X and Y coordinate.
*
* <h3>Pylon Points</h3>
* <h4>Control Points</h4>
* A Pylon Control Point (PCP) is a position where a wire (or rather two)
* is mounted onto a pylon.
* Each NRT does contain 4 PCPs which are bitmapped to a byte
* variable and are represented by the DiagDirection enum
*
* Each track ends on two PCPs and thus requires one pylon on each end. However,
* there is one exception: Straight-and-level tracks only have one pylon every
* other tile.
*
* Now on each edge there are two PCPs: One from each adjacent tile. Both PCPs
* are merged using an OR operation (i. e. if one tile needs a PCP at the position
* in question, both tiles get it).
*
* <h4>Position Points</h4>
* A Pylon Position Point (PPP) is a position where a pylon is located on the
* ground. Each PCP owns 8 in (45 degree steps) PPPs that are located around
* it. PPPs are represented using the Direction enum. Each track bit has PPPs
* that are impossible (because the pylon would be situated on the track) and
* some that are preferred (because the pylon would be rectangular to the track).
*
* @image html elrail_tile.png
* @image html elrail_track.png
*
*/
#include "stdafx.h"
#include "station_map.h"
#include "viewport_func.h"
#include "train.h"
#include "rail_gui.h"
#include "tunnelbridge_map.h"
#include "tunnelbridge.h"
#include "elrail_func.h"
#include "company_base.h"
#include "newgrf_railtype.h"
#include "table/elrail_data.h"
#include "safeguards.h"
/**
* Get the tile location group of a tile.
* @param t The tile to get the tile location group of.
* @return The tile location group.
*/
static inline TLG GetTLG(TileIndex t)
{
return (TLG)((HasBit(TileX(t), 0) << 1) + HasBit(TileY(t), 0));
}
/**
* Finds which Electrified Rail Bits are present on a given tile.
* @param t tile to check
* @param override pointer to PCP override, can be nullptr
* @return trackbits of tile if it is electrified
*/
static TrackBits GetRailTrackBitsUniversal(TileIndex t, uint8_t *override)
{
switch (GetTileType(t)) {
case MP_RAILWAY:
if (!HasRailCatenary(GetRailType(t))) return TRACK_BIT_NONE;
switch (GetRailTileType(t)) {
case RAIL_TILE_NORMAL: case RAIL_TILE_SIGNALS:
return GetTrackBits(t);
default:
return TRACK_BIT_NONE;
}
break;
case MP_TUNNELBRIDGE:
if (GetTunnelBridgeTransportType(t) != TRANSPORT_RAIL) return TRACK_BIT_NONE;
if (!HasRailCatenary(GetRailType(t))) return TRACK_BIT_NONE;
if (override != nullptr && (IsTunnel(t) || GetTunnelBridgeLength(t, GetOtherBridgeEnd(t)) > 0)) {
*override = 1 << GetTunnelBridgeDirection(t);
}
return DiagDirToDiagTrackBits(GetTunnelBridgeDirection(t));
case MP_ROAD:
if (!IsLevelCrossing(t)) return TRACK_BIT_NONE;
if (!HasRailCatenary(GetRailType(t))) return TRACK_BIT_NONE;
return GetCrossingRailBits(t);
case MP_STATION:
if (!HasStationRail(t)) return TRACK_BIT_NONE;
if (!HasRailCatenary(GetRailType(t))) return TRACK_BIT_NONE;
return TrackToTrackBits(GetRailStationTrack(t));
default:
return TRACK_BIT_NONE;
}
}
/**
* Masks out track bits when neighbouring tiles are unelectrified.
*/
static TrackBits MaskWireBits(TileIndex t, TrackBits tracks)
{
/* Single track bits are never masked out. */
if (HasAtMostOneBit(tracks)) [[likely]] return tracks;
if (!IsPlainRailTile(t)) return tracks;
TrackdirBits neighbour_tdb = TRACKDIR_BIT_NONE;
for (DiagDirection d = DIAGDIR_BEGIN; d < DIAGDIR_END; d++) {
/* If the neighbour tile is either not electrified or has no tracks that can be reached
* from this tile, mark all trackdirs that can be reached from the neighbour tile
* as needing no catenary. We make an exception for blocked station tiles with a matching
* axis that still display wires to preserve visual continuity. */
TileIndex next_tile = TileAddByDiagDir(t, d);
RailType rt = GetTileRailType(next_tile);
if (rt == INVALID_RAILTYPE || !HasRailCatenary(rt) ||
((TrackStatusToTrackBits(GetTileTrackStatus(next_tile, TRANSPORT_RAIL, 0)) & DiagdirReachesTracks(d)) == TRACK_BIT_NONE &&
(!HasStationTileRail(next_tile) || GetRailStationAxis(next_tile) != DiagDirToAxis(d) || !CanStationTileHaveWires(next_tile)))) {
neighbour_tdb |= DiagdirReachesTrackdirs(ReverseDiagDir(d));
}
}
/* If the tracks from either a diagonal crossing or don't overlap, both
* trackdirs have to be marked to mask the corresponding track bit. Else
* one marked trackdir is enough the mask the track bit. */
TrackBits mask;
if (tracks == TRACK_BIT_CROSS || !TracksOverlap(tracks)) {
/* If the tracks form either a diagonal crossing or don't overlap, both
* trackdirs have to be marked to mask the corresponding track bit. */
mask = ~(TrackBits)((neighbour_tdb & (neighbour_tdb >> 8)) & TRACK_BIT_MASK);
/* If that results in no masked tracks and it is not a diagonal crossing,
* require only one marked trackdir to mask. */
if (tracks != TRACK_BIT_CROSS && (mask & TRACK_BIT_MASK) == TRACK_BIT_MASK) mask = ~TrackdirBitsToTrackBits(neighbour_tdb);
} else {
/* Require only one marked trackdir to mask the track. */
mask = ~TrackdirBitsToTrackBits(neighbour_tdb);
/* If that results in an empty set, require both trackdirs for diagonal track. */
if ((tracks & mask) == TRACK_BIT_NONE) {
if ((neighbour_tdb & TRACKDIR_BIT_X_NE) == 0 || (neighbour_tdb & TRACKDIR_BIT_X_SW) == 0) mask |= TRACK_BIT_X;
if ((neighbour_tdb & TRACKDIR_BIT_Y_NW) == 0 || (neighbour_tdb & TRACKDIR_BIT_Y_SE) == 0) mask |= TRACK_BIT_Y;
/* If that still is not enough, require both trackdirs for any track. */
if ((tracks & mask) == TRACK_BIT_NONE) mask = ~(TrackBits)((neighbour_tdb & (neighbour_tdb >> 8)) & TRACK_BIT_MASK);
}
}
/* Mask the tracks only if at least one track bit would remain. */
return (tracks & mask) != TRACK_BIT_NONE ? tracks & mask : tracks;
}
/**
* Get the base wire sprite to use.
*/
static inline SpriteID GetWireBase(TileIndex tile, TileContext context = TCX_NORMAL)
{
const RailTypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
SpriteID wires = GetCustomRailSprite(rti, tile, RTSG_WIRES, context);
return wires == 0 ? SPR_WIRE_BASE : wires;
}
/**
* Get the base pylon sprite to use.
*/
static inline SpriteID GetPylonBase(TileIndex tile, TileContext context = TCX_NORMAL)
{
const RailTypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
SpriteID pylons = GetCustomRailSprite(rti, tile, RTSG_PYLONS, context);
return pylons == 0 ? SPR_PYLON_BASE : pylons;
}
/**
* Corrects the tileh for certain tile types. Returns an effective tileh for the track on the tile.
* @param tile The tile to analyse
* @param *tileh the tileh
*/
static void AdjustTileh(TileIndex tile, Slope *tileh)
{
if (IsTileType(tile, MP_TUNNELBRIDGE)) {
if (IsTunnel(tile)) {
*tileh = SLOPE_STEEP; // XXX - Hack to make tunnel entrances to always have a pylon
} else if (*tileh != SLOPE_FLAT) {
*tileh = SLOPE_FLAT;
} else {
*tileh = InclinedSlope(GetTunnelBridgeDirection(tile));
}
}
}
/**
* Returns the Z position of a Pylon Control Point.
*
* @param tile The tile the pylon should stand on.
* @param PCPpos The PCP of the tile.
* @return The Z position of the PCP.
*/
static int GetPCPElevation(TileIndex tile, DiagDirection PCPpos)
{
/* The elevation of the "pylon"-sprite should be the elevation at the PCP.
* PCPs are always on a tile edge.
*
* This position can be outside of the tile, i.e. ?_pcp_offset == TILE_SIZE > TILE_SIZE - 1.
* So we have to move it inside the tile, because if the neighboured tile has a foundation,
* that does not smoothly connect to the current tile, we will get a wrong elevation from GetSlopePixelZ().
*
* When we move the position inside the tile, we will get a wrong elevation if we have a slope.
* To catch all cases we round the Z position to the next (TILE_HEIGHT / 2).
* This will return the correct elevation for slopes and will also detect non-continuous elevation on edges.
*
* Also note that the result of GetSlopePixelZ() is very special on bridge-ramps.
*/
int z = GetSlopePixelZ(TileX(tile) * TILE_SIZE + std::min<int8_t>(x_pcp_offsets[PCPpos], TILE_SIZE - 1),
TileY(tile) * TILE_SIZE + std::min<int8_t>(y_pcp_offsets[PCPpos], TILE_SIZE - 1), true);
/* Round the Z to the nearest half tile height. */
static const uint HALF_TILE_HEIGHT = TILE_HEIGHT / 2;
return (z + HALF_TILE_HEIGHT / 2) / HALF_TILE_HEIGHT * HALF_TILE_HEIGHT;
}
/**
* Draws wires on a tunnel tile
*
* DrawTile_TunnelBridge() calls this function to draw the wires as SpriteCombine with the tunnel roof.
*
* @param ti The Tileinfo to draw the tile for
*/
void DrawRailCatenaryOnTunnel(const TileInfo *ti)
{
/* xmin, ymin, xmax + 1, ymax + 1 of BB */
static const int _tunnel_wire_BB[4][4] = {
{ 0, 1, 16, 15 }, // NE
{ 1, 0, 15, 16 }, // SE
{ 0, 1, 16, 15 }, // SW
{ 1, 0, 15, 16 }, // NW
};
DiagDirection dir = GetTunnelBridgeDirection(ti->tile);
SpriteID wire_base = GetWireBase(ti->tile);
const SortableSpriteStruct *sss = &RailCatenarySpriteData_Tunnel[dir];
const int *BB_data = _tunnel_wire_BB[dir];
AddSortableSpriteToDraw(
wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
BB_data[2] - sss->x_offset, BB_data[3] - sss->y_offset, BB_Z_SEPARATOR - sss->z_offset + 1,
GetTilePixelZ(ti->tile) + sss->z_offset,
IsTransparencySet(TO_CATENARY),
BB_data[0] - sss->x_offset, BB_data[1] - sss->y_offset, BB_Z_SEPARATOR - sss->z_offset
);
}
/**
* Draws wires and, if required, pylons on a given tile
* @param ti The Tileinfo to draw the tile for
*/
static void DrawRailCatenaryRailway(const TileInfo *ti)
{
/* Pylons are placed on a tile edge, so we need to take into account
* the track configuration of 2 adjacent tiles. trackconfig[0] stores the
* current tile (home tile) while [1] holds the neighbour */
TrackBits trackconfig[TS_END];
TrackBits wireconfig[TS_END];
bool isflat[TS_END];
/* Note that ti->tileh has already been adjusted for Foundations */
Slope tileh[TS_END] = { ti->tileh, SLOPE_FLAT };
/* Half tile slopes coincide only with horizontal/vertical track.
* Faking a flat slope results in the correct sprites on positions. */
Corner halftile_corner = CORNER_INVALID;
if (IsHalftileSlope(tileh[TS_HOME])) {
halftile_corner = GetHalftileSlopeCorner(tileh[TS_HOME]);
tileh[TS_HOME] = SLOPE_FLAT;
}
TLG tlg = GetTLG(ti->tile);
uint8_t PCPstatus = 0;
uint8_t OverridePCP = 0;
uint8_t PPPpreferred[DIAGDIR_END];
uint8_t PPPallowed[DIAGDIR_END];
/* Find which rail bits are present, and select the override points.
* We don't draw a pylon:
* 1) INSIDE a tunnel (we wouldn't see it anyway)
* 2) on the "far" end of a bridge head (the one that connects to bridge middle),
* because that one is drawn on the bridge. Exception is for length 0 bridges
* which have no middle tiles */
trackconfig[TS_HOME] = GetRailTrackBitsUniversal(ti->tile, &OverridePCP);
wireconfig[TS_HOME] = MaskWireBits(ti->tile, trackconfig[TS_HOME]);
/* If a track bit is present that is not in the main direction, the track is level */
isflat[TS_HOME] = ((trackconfig[TS_HOME] & (TRACK_BIT_HORZ | TRACK_BIT_VERT)) != 0);
AdjustTileh(ti->tile, &tileh[TS_HOME]);
SpriteID pylon_normal = GetPylonBase(ti->tile);
SpriteID pylon_halftile = (halftile_corner != CORNER_INVALID) ? GetPylonBase(ti->tile, TCX_UPPER_HALFTILE) : pylon_normal;
for (DiagDirection i = DIAGDIR_BEGIN; i < DIAGDIR_END; i++) {
static const uint edge_corners[] = {
1 << CORNER_N | 1 << CORNER_E, // DIAGDIR_NE
1 << CORNER_S | 1 << CORNER_E, // DIAGDIR_SE
1 << CORNER_S | 1 << CORNER_W, // DIAGDIR_SW
1 << CORNER_N | 1 << CORNER_W, // DIAGDIR_NW
};
SpriteID pylon_base = (halftile_corner != CORNER_INVALID && HasBit(edge_corners[i], halftile_corner)) ? pylon_halftile : pylon_normal;
TileIndex neighbour = ti->tile + TileOffsByDiagDir(i);
int elevation = GetPCPElevation(ti->tile, i);
/* Here's one of the main headaches. GetTileSlope does not correct for possibly
* existing foundataions, so we do have to do that manually later on.*/
tileh[TS_NEIGHBOUR] = GetTileSlope(neighbour);
trackconfig[TS_NEIGHBOUR] = GetRailTrackBitsUniversal(neighbour, nullptr);
wireconfig[TS_NEIGHBOUR] = MaskWireBits(neighbour, trackconfig[TS_NEIGHBOUR]);
if (IsTunnelTile(neighbour) && i != GetTunnelBridgeDirection(neighbour)) wireconfig[TS_NEIGHBOUR] = trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;
/* Ignore station tiles that allow neither wires nor pylons. */
if (IsRailStationTile(neighbour) && !CanStationTileHavePylons(neighbour) && !CanStationTileHaveWires(neighbour)) wireconfig[TS_NEIGHBOUR] = trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;
/* If the neighboured tile does not smoothly connect to the current tile (because of a foundation),
* we have to draw all pillars on the current tile. */
if (elevation != GetPCPElevation(neighbour, ReverseDiagDir(i))) wireconfig[TS_NEIGHBOUR] = trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;
isflat[TS_NEIGHBOUR] = ((trackconfig[TS_NEIGHBOUR] & (TRACK_BIT_HORZ | TRACK_BIT_VERT)) != 0);
PPPpreferred[i] = 0xFF; // We start with preferring everything (end-of-line in any direction)
PPPallowed[i] = AllowedPPPonPCP[i];
/* We cycle through all the existing tracks at a PCP and see what
* PPPs we want to have, or may not have at all */
for (uint k = 0; k < NUM_TRACKS_AT_PCP; k++) {
/* Next to us, we have a bridge head, don't worry about that one, if it shows away from us */
if (TrackSourceTile[i][k] == TS_NEIGHBOUR &&
IsBridgeTile(neighbour) &&
GetTunnelBridgeDirection(neighbour) == ReverseDiagDir(i)) {
continue;
}
/* We check whether the track in question (k) is present in the tile
* (TrackSourceTile) */
DiagDirection PCPpos = i;
if (HasBit(wireconfig[TrackSourceTile[i][k]], TracksAtPCP[i][k])) {
/* track found, if track is in the neighbour tile, adjust the number
* of the PCP for preferred/allowed determination*/
PCPpos = (TrackSourceTile[i][k] == TS_HOME) ? i : ReverseDiagDir(i);
SetBit(PCPstatus, i); // This PCP is in use
PPPpreferred[i] &= PreferredPPPofTrackAtPCP[TracksAtPCP[i][k]][PCPpos];
}
if (HasBit(trackconfig[TrackSourceTile[i][k]], TracksAtPCP[i][k])) {
PPPallowed[i] &= ~DisallowedPPPofTrackAtPCP[TracksAtPCP[i][k]][PCPpos];
}
}
/* Deactivate all PPPs if PCP is not used */
if (!HasBit(PCPstatus, i)) {
PPPpreferred[i] = 0;
PPPallowed[i] = 0;
}
Foundation foundation = FOUNDATION_NONE;
/* Station and road crossings are always "flat", so adjust the tileh accordingly */
if (IsTileType(neighbour, MP_STATION) || IsTileType(neighbour, MP_ROAD)) tileh[TS_NEIGHBOUR] = SLOPE_FLAT;
/* Read the foundations if they are present, and adjust the tileh */
if (trackconfig[TS_NEIGHBOUR] != TRACK_BIT_NONE && IsTileType(neighbour, MP_RAILWAY) && HasRailCatenary(GetRailType(neighbour))) foundation = GetRailFoundation(tileh[TS_NEIGHBOUR], trackconfig[TS_NEIGHBOUR]);
if (IsBridgeTile(neighbour)) {
foundation = GetBridgeFoundation(tileh[TS_NEIGHBOUR], DiagDirToAxis(GetTunnelBridgeDirection(neighbour)));
}
ApplyFoundationToSlope(foundation, tileh[TS_NEIGHBOUR]);
/* Half tile slopes coincide only with horizontal/vertical track.
* Faking a flat slope results in the correct sprites on positions. */
if (IsHalftileSlope(tileh[TS_NEIGHBOUR])) tileh[TS_NEIGHBOUR] = SLOPE_FLAT;
AdjustTileh(neighbour, &tileh[TS_NEIGHBOUR]);
/* If we have a straight (and level) track, we want a pylon only every 2 tiles
* Delete the PCP if this is the case.
* Level means that the slope is the same, or the track is flat */
if (tileh[TS_HOME] == tileh[TS_NEIGHBOUR] || (isflat[TS_HOME] && isflat[TS_NEIGHBOUR])) {
for (uint k = 0; k < NUM_IGNORE_GROUPS; k++) {
if (PPPpreferred[i] == IgnoredPCP[k][tlg][i]) ClrBit(PCPstatus, i);
}
}
/* Now decide where we draw our pylons. First try the preferred PPPs, but they may not exist.
* In that case, we try the any of the allowed ones. if they don't exist either, don't draw
* anything. Note that the preferred PPPs still contain the end-of-line markers.
* Remove those (simply by ANDing with allowed, since these markers are never allowed) */
if ((PPPallowed[i] & PPPpreferred[i]) != 0) PPPallowed[i] &= PPPpreferred[i];
if (IsBridgeAbove(ti->tile)) {
Track bridgetrack = GetBridgeAxis(ti->tile) == AXIS_X ? TRACK_X : TRACK_Y;
int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
if ((height <= GetTileMaxZ(ti->tile) + 1) &&
(i == PCPpositions[bridgetrack][0] || i == PCPpositions[bridgetrack][1])) {
SetBit(OverridePCP, i);
}
}
if (PPPallowed[i] != 0 && HasBit(PCPstatus, i) && !HasBit(OverridePCP, i) &&
(!IsRailStationTile(ti->tile) || CanStationTileHavePylons(ti->tile))) {
for (Direction k = DIR_BEGIN; k < DIR_END; k++) {
uint8_t temp = PPPorder[i][GetTLG(ti->tile)][k];
if (HasBit(PPPallowed[i], temp)) {
uint x = ti->x + x_pcp_offsets[i] + x_ppp_offsets[temp];
uint y = ti->y + y_pcp_offsets[i] + y_ppp_offsets[temp];
/* Don't build the pylon if it would be outside the tile */
if (!HasBit(OwnedPPPonPCP[i], temp)) {
/* We have a neighbour that will draw it, bail out */
if (trackconfig[TS_NEIGHBOUR] != TRACK_BIT_NONE) break;
continue; // No neighbour, go looking for a better position
}
AddSortableSpriteToDraw(pylon_base + pylon_sprites[temp], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE,
elevation, IsTransparencySet(TO_CATENARY), -1, -1);
break; // We already have drawn a pylon, bail out
}
}
}
}
/* The wire above the tunnel is drawn together with the tunnel-roof (see DrawRailCatenaryOnTunnel()) */
if (IsTunnelTile(ti->tile)) return;
/* Don't draw a wire under a low bridge */
if (IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_BRIDGES)) {
int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
if (height <= GetTileMaxZ(ti->tile) + 1) return;
}
/* Don't draw a wire if the station tile does not want any */
if (IsRailStationTile(ti->tile) && !CanStationTileHaveWires(ti->tile)) return;
SpriteID wire_normal = GetWireBase(ti->tile);
SpriteID wire_halftile = (halftile_corner != CORNER_INVALID) ? GetWireBase(ti->tile, TCX_UPPER_HALFTILE) : wire_normal;
Track halftile_track;
switch (halftile_corner) {
case CORNER_W: halftile_track = TRACK_LEFT; break;
case CORNER_S: halftile_track = TRACK_LOWER; break;
case CORNER_E: halftile_track = TRACK_RIGHT; break;
case CORNER_N: halftile_track = TRACK_UPPER; break;
default: halftile_track = INVALID_TRACK; break;
}
/* Drawing of pylons is finished, now draw the wires */
for (Track t : SetTrackBitIterator(wireconfig[TS_HOME])) {
SpriteID wire_base = (t == halftile_track) ? wire_halftile : wire_normal;
uint8_t PCPconfig = HasBit(PCPstatus, PCPpositions[t][0]) +
(HasBit(PCPstatus, PCPpositions[t][1]) << 1);
const SortableSpriteStruct *sss;
int tileh_selector = !(tileh[TS_HOME] % 3) * tileh[TS_HOME] / 3; // tileh for the slopes, 0 otherwise
assert(PCPconfig != 0); // We have a pylon on neither end of the wire, that doesn't work (since we have no sprites for that)
assert(!IsSteepSlope(tileh[TS_HOME]));
sss = &RailCatenarySpriteData[Wires[tileh_selector][t][PCPconfig]];
/*
* The "wire"-sprite position is inside the tile, i.e. 0 <= sss->?_offset < TILE_SIZE.
* Therefore it is safe to use GetSlopePixelZ() for the elevation.
* Also note that the result of GetSlopePixelZ() is very special for bridge-ramps, so we round the result up or
* down to the nearest full height change.
*/
AddSortableSpriteToDraw(wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
sss->x_size, sss->y_size, sss->z_size, (GetSlopePixelZ(ti->x + sss->x_offset, ti->y + sss->y_offset, true) + 4) / 8 * 8 + sss->z_offset,
IsTransparencySet(TO_CATENARY));
}
}
/**
* Draws wires on a tunnel tile
*
* DrawTile_TunnelBridge() calls this function to draw the wires on the bridge.
*
* @param ti The Tileinfo to draw the tile for
*/
void DrawRailCatenaryOnBridge(const TileInfo *ti)
{
TileIndex end = GetSouthernBridgeEnd(ti->tile);
TileIndex start = GetOtherBridgeEnd(end);
uint length = GetTunnelBridgeLength(start, end);
uint num = GetTunnelBridgeLength(ti->tile, start) + 1;
uint height;
const SortableSpriteStruct *sss;
Axis axis = GetBridgeAxis(ti->tile);
TLG tlg = GetTLG(ti->tile);
RailCatenarySprite offset = (RailCatenarySprite)(axis == AXIS_X ? 0 : WIRE_Y_FLAT_BOTH - WIRE_X_FLAT_BOTH);
if ((length % 2) && num == length) {
/* Draw the "short" wire on the southern end of the bridge
* only needed if the length of the bridge is odd */
sss = &RailCatenarySpriteData[WIRE_X_FLAT_BOTH + offset];
} else {
/* Draw "long" wires on all other tiles of the bridge (one pylon every two tiles) */
sss = &RailCatenarySpriteData[WIRE_X_FLAT_SW + (num % 2) + offset];
}
height = GetBridgePixelHeight(end);
SpriteID wire_base = GetWireBase(end, TCX_ON_BRIDGE);
AddSortableSpriteToDraw(wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
sss->x_size, sss->y_size, sss->z_size, height + sss->z_offset,
IsTransparencySet(TO_CATENARY)
);
SpriteID pylon_base = GetPylonBase(end, TCX_ON_BRIDGE);
/* Finished with wires, draw pylons
* every other tile needs a pylon on the northern end */
if (num % 2) {
DiagDirection PCPpos = (axis == AXIS_X ? DIAGDIR_NE : DIAGDIR_NW);
Direction PPPpos = (axis == AXIS_X ? DIR_NW : DIR_NE);
if (HasBit(tlg, (axis == AXIS_X ? 0 : 1))) PPPpos = ReverseDir(PPPpos);
uint x = ti->x + x_pcp_offsets[PCPpos] + x_ppp_offsets[PPPpos];
uint y = ti->y + y_pcp_offsets[PCPpos] + y_ppp_offsets[PPPpos];
AddSortableSpriteToDraw(pylon_base + pylon_sprites[PPPpos], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, height, IsTransparencySet(TO_CATENARY), -1, -1);
}
/* need a pylon on the southern end of the bridge */
if (GetTunnelBridgeLength(ti->tile, start) + 1 == length) {
DiagDirection PCPpos = (axis == AXIS_X ? DIAGDIR_SW : DIAGDIR_SE);
Direction PPPpos = (axis == AXIS_X ? DIR_NW : DIR_NE);
if (HasBit(tlg, (axis == AXIS_X ? 0 : 1))) PPPpos = ReverseDir(PPPpos);
uint x = ti->x + x_pcp_offsets[PCPpos] + x_ppp_offsets[PPPpos];
uint y = ti->y + y_pcp_offsets[PCPpos] + y_ppp_offsets[PPPpos];
AddSortableSpriteToDraw(pylon_base + pylon_sprites[PPPpos], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, height, IsTransparencySet(TO_CATENARY), -1, -1);
}
}
/**
* Draws overhead wires and pylons for electric railways.
* @param ti The TileInfo struct of the tile being drawn
* @see DrawRailCatenaryRailway
*/
void DrawRailCatenary(const TileInfo *ti)
{
switch (GetTileType(ti->tile)) {
case MP_RAILWAY:
if (IsRailDepot(ti->tile)) {
const SortableSpriteStruct *sss = &RailCatenarySpriteData_Depot[GetRailDepotDirection(ti->tile)];
SpriteID wire_base = GetWireBase(ti->tile);
/* This wire is not visible with the default depot sprites */
AddSortableSpriteToDraw(
wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
sss->x_size, sss->y_size, sss->z_size,
GetTileMaxPixelZ(ti->tile) + sss->z_offset,
IsTransparencySet(TO_CATENARY)
);
return;
}
break;
case MP_TUNNELBRIDGE:
case MP_ROAD:
case MP_STATION:
break;
default: return;
}
DrawRailCatenaryRailway(ti);
}
void SettingsDisableElrail(int32_t new_value)
{
bool disable = (new_value != 0);
/* pick appropriate railtype for elrail engines depending on setting */
const RailType new_railtype = disable ? RAILTYPE_RAIL : RAILTYPE_ELECTRIC;
/* walk through all train engines */
for (Engine *e : Engine::IterateType(VEH_TRAIN)) {
RailVehicleInfo *rv_info = &e->u.rail;
/* update railtype of engines intended to use elrail */
if (rv_info->intended_railtype == RAILTYPE_ELECTRIC) {
rv_info->railtype = new_railtype;
}
}
/* when disabling elrails, make sure that all existing trains can run on
* normal rail too */
if (disable) {
for (Train *t : Train::Iterate()) {
if (t->railtype == RAILTYPE_ELECTRIC) {
/* this railroad vehicle is now compatible only with elrail,
* so add there also normal rail compatibility */
t->compatible_railtypes |= RAILTYPES_RAIL;
t->railtype = RAILTYPE_RAIL;
SetBit(t->flags, VRF_EL_ENGINE_ALLOWED_NORMAL_RAIL);
}
}
}
/* Fix the total power and acceleration for trains */
for (Train *t : Train::Iterate()) {
/* power and acceleration is cached only for front engines */
if (t->IsFrontEngine()) {
t->ConsistChanged(CCF_TRACK);
}
}
for (Company *c : Company::Iterate()) c->avail_railtypes = GetCompanyRailTypes(c->index);
/* This resets the _last_built_railtype, which will be invalid for electric
* rails. It may have unintended consequences if that function is ever
* extended, though. */
ReinitGuiAfterToggleElrail(disable);
}
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