146 lines
6.7 KiB
C
146 lines
6.7 KiB
C
/* $Id$ */
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#include "stdafx.h"
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#include "openttd.h"
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#include "rail.h"
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#include "station.h"
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/* XXX: Below 3 tables store duplicate data. Maybe remove some? */
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/* Maps a trackdir to the bit that stores its status in the map arrays, in the
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* direction along with the trackdir */
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const byte _signal_along_trackdir[] = {
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0x80, 0x80, 0x80, 0x20, 0x40, 0x10, 0, 0,
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0x40, 0x40, 0x40, 0x10, 0x80, 0x20
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};
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/* Maps a trackdir to the bit that stores its status in the map arrays, in the
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* direction against the trackdir */
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const byte _signal_against_trackdir[] = {
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0x40, 0x40, 0x40, 0x10, 0x80, 0x20, 0, 0,
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0x80, 0x80, 0x80, 0x20, 0x40, 0x10
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};
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/* Maps a Track to the bits that store the status of the two signals that can
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* be present on the given track */
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const byte _signal_on_track[] = {
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0xC0, 0xC0, 0xC0, 0x30, 0xC0, 0x30
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};
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/* Maps a diagonal direction to the all trackdirs that are connected to any
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* track entering in this direction (including those making 90 degree turns)
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*/
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const TrackdirBits _exitdir_reaches_trackdirs[] = {
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TRACKDIR_BIT_DIAG1_NE | TRACKDIR_BIT_LOWER_E | TRACKDIR_BIT_LEFT_N, /* DIAGDIR_NE */
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TRACKDIR_BIT_DIAG2_SE | TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_UPPER_E, /* DIAGDIR_SE */
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TRACKDIR_BIT_DIAG1_SW | TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_RIGHT_S, /* DIAGDIR_SW */
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TRACKDIR_BIT_DIAG2_NW | TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_W /* DIAGDIR_NW */
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};
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const Trackdir _next_trackdir[] = {
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TRACKDIR_DIAG1_NE, TRACKDIR_DIAG2_SE, TRACKDIR_LOWER_E, TRACKDIR_UPPER_E, TRACKDIR_RIGHT_S, TRACKDIR_LEFT_S, INVALID_TRACKDIR, INVALID_TRACKDIR,
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TRACKDIR_DIAG1_SW, TRACKDIR_DIAG2_NW, TRACKDIR_LOWER_W, TRACKDIR_UPPER_W, TRACKDIR_RIGHT_N, TRACKDIR_LEFT_N
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};
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/* Maps a trackdir to all trackdirs that make 90 deg turns with it. */
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const TrackdirBits _track_crosses_trackdirs[] = {
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TRACKDIR_BIT_DIAG2_SE | TRACKDIR_BIT_DIAG2_NW, /* TRACK_DIAG1 */
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TRACKDIR_BIT_DIAG1_NE | TRACKDIR_BIT_DIAG1_SW, /* TRACK_DIAG2 */
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TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_LEFT_S, /* TRACK_UPPER */
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TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_LEFT_S, /* TRACK_LOWER */
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TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_UPPER_E | TRACKDIR_BIT_LOWER_W | TRACKDIR_BIT_LOWER_E, /* TRACK_LEFT */
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TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_UPPER_E | TRACKDIR_BIT_LOWER_W | TRACKDIR_BIT_LOWER_E /* TRACK_RIGHT */
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};
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/* Maps a track to all tracks that make 90 deg turns with it. */
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const TrackBits _track_crosses_tracks[] = {
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TRACK_BIT_DIAG2, /* TRACK_DIAG1 */
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TRACK_BIT_DIAG1, /* TRACK_DIAG2 */
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TRACK_BIT_LEFT | TRACK_BIT_RIGHT, /* TRACK_UPPER */
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TRACK_BIT_LEFT | TRACK_BIT_RIGHT, /* TRACK_LOWER */
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TRACK_BIT_UPPER | TRACK_BIT_LOWER, /* TRACK_LEFT */
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TRACK_BIT_UPPER | TRACK_BIT_LOWER /* TRACK_RIGHT */
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};
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/* Maps a trackdir to the (4-way) direction the tile is exited when following
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* that trackdir */
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const DiagDirection _trackdir_to_exitdir[] = {
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DIAGDIR_NE,DIAGDIR_SE,DIAGDIR_NE,DIAGDIR_SE,DIAGDIR_SW,DIAGDIR_SE, DIAGDIR_NE,DIAGDIR_NE,
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DIAGDIR_SW,DIAGDIR_NW,DIAGDIR_NW,DIAGDIR_SW,DIAGDIR_NW,DIAGDIR_NE,
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};
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const Trackdir _track_exitdir_to_trackdir[][DIAGDIR_END] = {
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{TRACKDIR_DIAG1_NE, INVALID_TRACKDIR, TRACKDIR_DIAG1_SW, INVALID_TRACKDIR},
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{INVALID_TRACKDIR, TRACKDIR_DIAG2_SE, INVALID_TRACKDIR, TRACKDIR_DIAG2_NW},
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{TRACKDIR_UPPER_E, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_UPPER_W},
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{INVALID_TRACKDIR, TRACKDIR_LOWER_E, TRACKDIR_LOWER_W, INVALID_TRACKDIR},
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{INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LEFT_S, TRACKDIR_LEFT_N},
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{TRACKDIR_RIGHT_N, TRACKDIR_RIGHT_S, INVALID_TRACKDIR, INVALID_TRACKDIR}
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};
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const Trackdir _track_enterdir_to_trackdir[][DIAGDIR_END] = { // TODO: replace magic with enums
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{TRACKDIR_DIAG1_NE, INVALID_TRACKDIR, TRACKDIR_DIAG1_SW, INVALID_TRACKDIR},
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{INVALID_TRACKDIR, TRACKDIR_DIAG2_SE, INVALID_TRACKDIR, TRACKDIR_DIAG2_NW},
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{INVALID_TRACKDIR, TRACKDIR_UPPER_E, TRACKDIR_UPPER_W, INVALID_TRACKDIR},
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{TRACKDIR_LOWER_E, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LOWER_W},
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{TRACKDIR_LEFT_N, TRACKDIR_LEFT_S, INVALID_TRACKDIR, INVALID_TRACKDIR},
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{INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_RIGHT_S, TRACKDIR_RIGHT_N}
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};
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const Trackdir _track_direction_to_trackdir[][DIR_END] = {
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{INVALID_TRACKDIR, TRACKDIR_DIAG1_NE, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_DIAG1_SW, INVALID_TRACKDIR, INVALID_TRACKDIR},
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{INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_DIAG2_SE, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_DIAG2_NW},
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{INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_UPPER_E, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_UPPER_W, INVALID_TRACKDIR},
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{INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LOWER_E, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LOWER_W, INVALID_TRACKDIR},
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{TRACKDIR_LEFT_N, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LEFT_S, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR},
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{TRACKDIR_RIGHT_N, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_RIGHT_S, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR}
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};
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const Trackdir _dir_to_diag_trackdir[] = {
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TRACKDIR_DIAG1_NE, TRACKDIR_DIAG2_SE, TRACKDIR_DIAG1_SW, TRACKDIR_DIAG2_NW,
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};
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const DiagDirection _reverse_diagdir[] = {
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DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_NE, DIAGDIR_SE
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};
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const Trackdir _reverse_trackdir[] = {
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TRACKDIR_DIAG1_SW, TRACKDIR_DIAG2_NW, TRACKDIR_UPPER_W, TRACKDIR_LOWER_W, TRACKDIR_LEFT_N, TRACKDIR_RIGHT_N, INVALID_TRACKDIR, INVALID_TRACKDIR,
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TRACKDIR_DIAG1_NE, TRACKDIR_DIAG2_SE, TRACKDIR_UPPER_E, TRACKDIR_LOWER_E, TRACKDIR_LEFT_S, TRACKDIR_RIGHT_S
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};
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RailType GetTileRailType(TileIndex tile, Trackdir trackdir)
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{
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RailType type = INVALID_RAILTYPE;
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DiagDirection exitdir = TrackdirToExitdir(trackdir);
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switch (GetTileType(tile)) {
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case MP_RAILWAY:
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/* railway track */
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type = _m[tile].m3 & RAILTYPE_MASK;
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break;
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case MP_STREET:
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/* rail/road crossing */
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if (IsLevelCrossing(tile))
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type = _m[tile].m4 & RAILTYPE_MASK;
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break;
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case MP_STATION:
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if (IsTrainStationTile(tile))
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type = _m[tile].m3 & RAILTYPE_MASK;
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break;
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case MP_TUNNELBRIDGE:
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/* railway tunnel */
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if ((_m[tile].m5 & 0xFC) == 0) type = _m[tile].m3 & RAILTYPE_MASK;
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/* railway bridge ending */
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if ((_m[tile].m5 & 0xC6) == 0x80) type = _m[tile].m3 & RAILTYPE_MASK;
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/* on railway bridge */
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if ((_m[tile].m5 & 0xC6) == 0xC0 && ((DiagDirection)(_m[tile].m5 & 0x1)) == (exitdir & 0x1))
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type = (_m[tile].m3 >> 4) & RAILTYPE_MASK;
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/* under bridge (any type) */
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if ((_m[tile].m5 & 0xC0) == 0xC0 && (_m[tile].m5 & 0x1U) != (exitdir & 0x1))
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type = _m[tile].m3 & RAILTYPE_MASK;
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break;
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default:
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break;
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}
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return type;
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}
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