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/* $Id$ */
/** @file rail.cpp */
#include "stdafx.h"
#include "openttd.h"
#include "bridge_map.h"
#include "rail.h"
#include "station_map.h"
#include "tunnel_map.h"
/* XXX: Below 3 tables store duplicate data. Maybe remove some? */
/* Maps a trackdir to the bit that stores its status in the map arrays, in the
* direction along with the trackdir */
extern const byte _signal_along_trackdir[] = {
0x8, 0x8, 0x8, 0x2, 0x4, 0x1, 0, 0,
0x4, 0x4, 0x4, 0x1, 0x8, 0x2
};
/* Maps a trackdir to the bit that stores its status in the map arrays, in the
* direction against the trackdir */
extern const byte _signal_against_trackdir[] = {
0x4, 0x4, 0x4, 0x1, 0x8, 0x2, 0, 0,
0x8, 0x8, 0x8, 0x2, 0x4, 0x1
};
/* Maps a Track to the bits that store the status of the two signals that can
* be present on the given track */
extern const byte _signal_on_track[] = {
0xC, 0xC, 0xC, 0x3, 0xC, 0x3
};
/* Maps a diagonal direction to the all trackdirs that are connected to any
* track entering in this direction (including those making 90 degree turns)
*/
extern const TrackdirBits _exitdir_reaches_trackdirs[] = {
TRACKDIR_BIT_X_NE | TRACKDIR_BIT_LOWER_E | TRACKDIR_BIT_LEFT_N, /* DIAGDIR_NE */
TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_UPPER_E, /* DIAGDIR_SE */
TRACKDIR_BIT_X_SW | TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_RIGHT_S, /* DIAGDIR_SW */
TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_W /* DIAGDIR_NW */
};
extern const Trackdir _next_trackdir[] = {
TRACKDIR_X_NE, TRACKDIR_Y_SE, TRACKDIR_LOWER_E, TRACKDIR_UPPER_E, TRACKDIR_RIGHT_S, TRACKDIR_LEFT_S, INVALID_TRACKDIR, INVALID_TRACKDIR,
TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_LOWER_W, TRACKDIR_UPPER_W, TRACKDIR_RIGHT_N, TRACKDIR_LEFT_N
};
/* Maps a trackdir to all trackdirs that make 90 deg turns with it. */
extern const TrackdirBits _track_crosses_trackdirs[] = {
TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_Y_NW, /* TRACK_X */
TRACKDIR_BIT_X_NE | TRACKDIR_BIT_X_SW, /* TRACK_Y */
TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_LEFT_S, /* TRACK_UPPER */
TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_LEFT_S, /* TRACK_LOWER */
TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_UPPER_E | TRACKDIR_BIT_LOWER_W | TRACKDIR_BIT_LOWER_E, /* TRACK_LEFT */
TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_UPPER_E | TRACKDIR_BIT_LOWER_W | TRACKDIR_BIT_LOWER_E /* TRACK_RIGHT */
};
/* Maps a track to all tracks that make 90 deg turns with it. */
extern const TrackBits _track_crosses_tracks[] = {
TRACK_BIT_Y, /* TRACK_X */
TRACK_BIT_X, /* TRACK_Y */
TRACK_BIT_VERT, /* TRACK_UPPER */
TRACK_BIT_VERT, /* TRACK_LOWER */
TRACK_BIT_HORZ, /* TRACK_LEFT */
TRACK_BIT_HORZ /* TRACK_RIGHT */
};
/* Maps a trackdir to the (4-way) direction the tile is exited when following
* that trackdir */
extern const DiagDirection _trackdir_to_exitdir[] = {
DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_SW, DIAGDIR_SE, DIAGDIR_NE, DIAGDIR_NE,
DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_NW, DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_NE,
};
extern const Trackdir _track_exitdir_to_trackdir[][DIAGDIR_END] = {
{TRACKDIR_X_NE, INVALID_TRACKDIR, TRACKDIR_X_SW, INVALID_TRACKDIR},
{INVALID_TRACKDIR, TRACKDIR_Y_SE, INVALID_TRACKDIR, TRACKDIR_Y_NW},
{TRACKDIR_UPPER_E, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_UPPER_W},
{INVALID_TRACKDIR, TRACKDIR_LOWER_E, TRACKDIR_LOWER_W, INVALID_TRACKDIR},
{INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LEFT_S, TRACKDIR_LEFT_N},
{TRACKDIR_RIGHT_N, TRACKDIR_RIGHT_S, INVALID_TRACKDIR, INVALID_TRACKDIR}
};
extern const Trackdir _track_enterdir_to_trackdir[][DIAGDIR_END] = {
{TRACKDIR_X_NE, INVALID_TRACKDIR, TRACKDIR_X_SW, INVALID_TRACKDIR},
{INVALID_TRACKDIR, TRACKDIR_Y_SE, INVALID_TRACKDIR, TRACKDIR_Y_NW},
{INVALID_TRACKDIR, TRACKDIR_UPPER_E, TRACKDIR_UPPER_W, INVALID_TRACKDIR},
{TRACKDIR_LOWER_E, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LOWER_W},
{TRACKDIR_LEFT_N, TRACKDIR_LEFT_S, INVALID_TRACKDIR, INVALID_TRACKDIR},
{INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_RIGHT_S, TRACKDIR_RIGHT_N}
};
extern const Trackdir _track_direction_to_trackdir[][DIR_END] = {
{INVALID_TRACKDIR, TRACKDIR_X_NE, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_X_SW, INVALID_TRACKDIR, INVALID_TRACKDIR},
{INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_Y_SE, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_Y_NW},
{INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_UPPER_E, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_UPPER_W, INVALID_TRACKDIR},
{INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LOWER_E, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LOWER_W, INVALID_TRACKDIR},
{TRACKDIR_LEFT_N, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LEFT_S, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR},
{TRACKDIR_RIGHT_N, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_RIGHT_S, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR}
};
extern const Trackdir _dir_to_diag_trackdir[] = {
TRACKDIR_X_NE, TRACKDIR_Y_SE, TRACKDIR_X_SW, TRACKDIR_Y_NW,
};
extern const TrackBits _corner_to_trackbits[] = {
TRACK_BIT_LEFT, TRACK_BIT_LOWER, TRACK_BIT_RIGHT, TRACK_BIT_UPPER,
};
RailType GetTileRailType(TileIndex tile)
{
switch (GetTileType(tile)) {
case MP_RAILWAY:
return GetRailType(tile);
case MP_ROAD:
/* rail/road crossing */
if (IsLevelCrossing(tile)) return GetRailType(tile);
break;
case MP_STATION:
if (IsRailwayStationTile(tile)) return GetRailType(tile);
break;
case MP_TUNNELBRIDGE:
if (IsTunnel(tile)) {
if (GetTunnelTransportType(tile) == TRANSPORT_RAIL) return GetRailType(tile);
} else {
if (GetBridgeTransportType(tile) == TRANSPORT_RAIL) return GetRailType(tile);
}
break;
default:
break;
}
return INVALID_RAILTYPE;
}
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