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/* $Id$ */
#include "stdafx.h"
#include "openttd.h"
#include "rail.h"
#include "station.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 */
const byte _signal_along_trackdir[] = {
0x80, 0x80, 0x80, 0x20, 0x40, 0x10, 0, 0,
0x40, 0x40, 0x40, 0x10, 0x80, 0x20
};
/* Maps a trackdir to the bit that stores its status in the map arrays, in the
* direction against the trackdir */
const byte _signal_against_trackdir[] = {
0x40, 0x40, 0x40, 0x10, 0x80, 0x20, 0, 0,
0x80, 0x80, 0x80, 0x20, 0x40, 0x10
};
/* Maps a Track to the bits that store the status of the two signals that can
* be present on the given track */
const byte _signal_on_track[] = {
0xC0, 0xC0, 0xC0, 0x30, 0xC0, 0x30
};
/* Maps a diagonal direction to the all trackdirs that are connected to any
* track entering in this direction (including those making 90 degree turns)
*/
const TrackdirBits _exitdir_reaches_trackdirs[] = {
TRACKDIR_BIT_DIAG1_NE | TRACKDIR_BIT_LOWER_E | TRACKDIR_BIT_LEFT_N, /* DIAGDIR_NE */
TRACKDIR_BIT_DIAG2_SE | TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_UPPER_E, /* DIAGDIR_SE */
TRACKDIR_BIT_DIAG1_SW | TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_RIGHT_S, /* DIAGDIR_SW */
TRACKDIR_BIT_DIAG2_NW | TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_W /* DIAGDIR_NW */
};
const Trackdir _next_trackdir[] = {
TRACKDIR_DIAG1_NE, TRACKDIR_DIAG2_SE, TRACKDIR_LOWER_E, TRACKDIR_UPPER_E, TRACKDIR_RIGHT_S, TRACKDIR_LEFT_S, INVALID_TRACKDIR, INVALID_TRACKDIR,
TRACKDIR_DIAG1_SW, TRACKDIR_DIAG2_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. */
const TrackdirBits _track_crosses_trackdirs[] = {
TRACKDIR_BIT_DIAG2_SE | TRACKDIR_BIT_DIAG2_NW, /* TRACK_DIAG1 */
TRACKDIR_BIT_DIAG1_NE | TRACKDIR_BIT_DIAG1_SW, /* TRACK_DIAG2 */
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. */
const TrackBits _track_crosses_tracks[] = {
TRACK_BIT_DIAG2, /* TRACK_DIAG1 */
TRACK_BIT_DIAG1, /* TRACK_DIAG2 */
TRACK_BIT_LEFT | TRACK_BIT_RIGHT, /* TRACK_UPPER */
TRACK_BIT_LEFT | TRACK_BIT_RIGHT, /* TRACK_LOWER */
TRACK_BIT_UPPER | TRACK_BIT_LOWER, /* TRACK_LEFT */
TRACK_BIT_UPPER | TRACK_BIT_LOWER /* TRACK_RIGHT */
};
/* Maps a trackdir to the (4-way) direction the tile is exited when following
* that trackdir */
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,
};
const Trackdir _track_exitdir_to_trackdir[][DIAGDIR_END] = {
{TRACKDIR_DIAG1_NE, INVALID_TRACKDIR, TRACKDIR_DIAG1_SW, INVALID_TRACKDIR},
{INVALID_TRACKDIR, TRACKDIR_DIAG2_SE, INVALID_TRACKDIR, TRACKDIR_DIAG2_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}
};
const Trackdir _track_enterdir_to_trackdir[][DIAGDIR_END] = { // TODO: replace magic with enums
{TRACKDIR_DIAG1_NE, INVALID_TRACKDIR, TRACKDIR_DIAG1_SW, INVALID_TRACKDIR},
{INVALID_TRACKDIR, TRACKDIR_DIAG2_SE, INVALID_TRACKDIR, TRACKDIR_DIAG2_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}
};
const Trackdir _track_direction_to_trackdir[][DIR_END] = {
{INVALID_TRACKDIR, TRACKDIR_DIAG1_NE, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_DIAG1_SW, INVALID_TRACKDIR, INVALID_TRACKDIR},
{INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_DIAG2_SE, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_DIAG2_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}
};
const Trackdir _dir_to_diag_trackdir[] = {
TRACKDIR_DIAG1_NE, TRACKDIR_DIAG2_SE, TRACKDIR_DIAG1_SW, TRACKDIR_DIAG2_NW,
};
const DiagDirection _reverse_diagdir[] = {
DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_NE, DIAGDIR_SE
};
const Trackdir _reverse_trackdir[] = {
TRACKDIR_DIAG1_SW, TRACKDIR_DIAG2_NW, TRACKDIR_UPPER_W, TRACKDIR_LOWER_W, TRACKDIR_LEFT_N, TRACKDIR_RIGHT_N, INVALID_TRACKDIR, INVALID_TRACKDIR,
TRACKDIR_DIAG1_NE, TRACKDIR_DIAG2_SE, TRACKDIR_UPPER_E, TRACKDIR_LOWER_E, TRACKDIR_LEFT_S, TRACKDIR_RIGHT_S
};
RailType GetTileRailType(TileIndex tile, Trackdir trackdir)
{
RailType type = INVALID_RAILTYPE;
DiagDirection exitdir = TrackdirToExitdir(trackdir);
switch (GetTileType(tile)) {
case MP_RAILWAY:
/* railway track */
type = _m[tile].m3 & RAILTYPE_MASK;
break;
case MP_STREET:
/* rail/road crossing */
if (IsLevelCrossing(tile))
type = _m[tile].m4 & RAILTYPE_MASK;
break;
case MP_STATION:
if (IsTrainStationTile(tile))
type = _m[tile].m3 & RAILTYPE_MASK;
break;
case MP_TUNNELBRIDGE:
/* railway tunnel */
if ((_m[tile].m5 & 0xFC) == 0) type = _m[tile].m3 & RAILTYPE_MASK;
/* railway bridge ending */
if ((_m[tile].m5 & 0xC6) == 0x80) type = _m[tile].m3 & RAILTYPE_MASK;
/* on railway bridge */
if ((_m[tile].m5 & 0xC6) == 0xC0 && ((DiagDirection)(_m[tile].m5 & 0x1)) == (exitdir & 0x1))
type = (_m[tile].m3 >> 4) & RAILTYPE_MASK;
/* under bridge (any type) */
if ((_m[tile].m5 & 0xC0) == 0xC0 && (_m[tile].m5 & 0x1U) != (exitdir & 0x1))
type = _m[tile].m3 & RAILTYPE_MASK;
break;
default:
break;
}
return type;
}
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