tron@2186: /* $Id$ */
tron@2186: 
matthijs@1948: #include "stdafx.h"
matthijs@1948: #include "openttd.h"
matthijs@1942: #include "rail.h"
matthijs@1950: #include "station.h"
matthijs@1942: 
matthijs@1944: /* XXX: Below 3 tables store duplicate data. Maybe remove some? */
matthijs@1942: /* Maps a trackdir to the bit that stores its status in the map arrays, in the
matthijs@1942:  * direction along with the trackdir */
matthijs@1942: const byte _signal_along_trackdir[] = {
matthijs@1942: 	0x80, 0x80, 0x80, 0x20, 0x40, 0x10, 0, 0,
matthijs@1942: 	0x40, 0x40, 0x40, 0x10, 0x80, 0x20
matthijs@1942: };
matthijs@1942: 
matthijs@1942: /* Maps a trackdir to the bit that stores its status in the map arrays, in the
matthijs@1942:  * direction against the trackdir */
matthijs@1942: const byte _signal_against_trackdir[] = {
matthijs@1942: 	0x40, 0x40, 0x40, 0x10, 0x80, 0x20, 0, 0,
matthijs@1942: 	0x80, 0x80, 0x80, 0x20, 0x40, 0x10
matthijs@1942: };
matthijs@1942: 
matthijs@1942: /* Maps a Track to the bits that store the status of the two signals that can
matthijs@1942:  * be present on the given track */
matthijs@1942: const byte _signal_on_track[] = {
matthijs@1942: 	0xC0, 0xC0, 0xC0, 0x30, 0xC0, 0x30
matthijs@1942: };
matthijs@1942: 
matthijs@1942: /* Maps a diagonal direction to the all trackdirs that are connected to any
matthijs@1942:  * track entering in this direction (including those making 90 degree turns)
matthijs@1942:  */
matthijs@1942: const TrackdirBits _exitdir_reaches_trackdirs[] = {
matthijs@1944: 	TRACKDIR_BIT_DIAG1_NE | TRACKDIR_BIT_LOWER_E | TRACKDIR_BIT_LEFT_N,  /* DIAGDIR_NE */
matthijs@1944: 	TRACKDIR_BIT_DIAG2_SE | TRACKDIR_BIT_LEFT_S  | TRACKDIR_BIT_UPPER_E, /* DIAGDIR_SE */
matthijs@1944: 	TRACKDIR_BIT_DIAG1_SW | TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_RIGHT_S, /* DIAGDIR_SW */
matthijs@1944: 	TRACKDIR_BIT_DIAG2_NW | TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_W  /* DIAGDIR_NW */
matthijs@1942: };
matthijs@1942: 
matthijs@1944: const Trackdir _next_trackdir[] = {
matthijs@1944: 	TRACKDIR_DIAG1_NE,  TRACKDIR_DIAG2_SE,  TRACKDIR_LOWER_E, TRACKDIR_UPPER_E, TRACKDIR_RIGHT_S, TRACKDIR_LEFT_S, INVALID_TRACKDIR, INVALID_TRACKDIR,
matthijs@1944: 	TRACKDIR_DIAG1_SW,  TRACKDIR_DIAG2_NW,  TRACKDIR_LOWER_W, TRACKDIR_UPPER_W, TRACKDIR_RIGHT_N, TRACKDIR_LEFT_N
matthijs@1942: };
matthijs@1942: 
matthijs@1942: /* Maps a trackdir to all trackdirs that make 90 deg turns with it. */
matthijs@1944: const TrackdirBits _track_crosses_trackdirs[] = {
matthijs@1944: 	TRACKDIR_BIT_DIAG2_SE | TRACKDIR_BIT_DIAG2_NW,                                               /* TRACK_DIAG1 */
matthijs@1944: 	TRACKDIR_BIT_DIAG1_NE | TRACKDIR_BIT_DIAG1_SW,                                               /* TRACK_DIAG2 */
matthijs@1944: 	TRACKDIR_BIT_RIGHT_N  | TRACKDIR_BIT_RIGHT_S  | TRACKDIR_BIT_LEFT_N  | TRACKDIR_BIT_LEFT_S,  /* TRACK_UPPER */
matthijs@1944: 	TRACKDIR_BIT_RIGHT_N  | TRACKDIR_BIT_RIGHT_S  | TRACKDIR_BIT_LEFT_N  | TRACKDIR_BIT_LEFT_S,  /* TRACK_LOWER */
matthijs@1944: 	TRACKDIR_BIT_UPPER_W  | TRACKDIR_BIT_UPPER_E  | TRACKDIR_BIT_LOWER_W | TRACKDIR_BIT_LOWER_E, /* TRACK_LEFT  */
matthijs@1944: 	TRACKDIR_BIT_UPPER_W  | TRACKDIR_BIT_UPPER_E  | TRACKDIR_BIT_LOWER_W | TRACKDIR_BIT_LOWER_E  /* TRACK_RIGHT */
matthijs@1942: };
matthijs@1942: 
matthijs@1942: /* Maps a track to all tracks that make 90 deg turns with it. */
matthijs@1942: const TrackBits _track_crosses_tracks[] = {
matthijs@1944: 	TRACK_BIT_DIAG2,                   /* TRACK_DIAG1 */
matthijs@1944: 	TRACK_BIT_DIAG1,                   /* TRACK_DIAG2 */
matthijs@1944: 	TRACK_BIT_LEFT  | TRACK_BIT_RIGHT, /* TRACK_UPPER */
matthijs@1944: 	TRACK_BIT_LEFT  | TRACK_BIT_RIGHT, /* TRACK_LOWER */
matthijs@1944: 	TRACK_BIT_UPPER | TRACK_BIT_LOWER, /* TRACK_LEFT  */
matthijs@1944: 	TRACK_BIT_UPPER | TRACK_BIT_LOWER  /* TRACK_RIGHT */
matthijs@1942: };
matthijs@1942: 
matthijs@1942: /* Maps a trackdir to the (4-way) direction the tile is exited when following
matthijs@1942:  * that trackdir */
matthijs@1942: const DiagDirection _trackdir_to_exitdir[] = {
matthijs@1944: 	DIAGDIR_NE,DIAGDIR_SE,DIAGDIR_NE,DIAGDIR_SE,DIAGDIR_SW,DIAGDIR_SE, DIAGDIR_NE,DIAGDIR_NE,
matthijs@1944: 	DIAGDIR_SW,DIAGDIR_NW,DIAGDIR_NW,DIAGDIR_SW,DIAGDIR_NW,DIAGDIR_NE,
matthijs@1942: };
matthijs@1942: 
matthijs@1942: const Trackdir _track_exitdir_to_trackdir[][DIAGDIR_END] = {
matthijs@1944: 	{TRACKDIR_DIAG1_NE, INVALID_TRACKDIR,  TRACKDIR_DIAG1_SW, INVALID_TRACKDIR},
matthijs@1944: 	{INVALID_TRACKDIR,  TRACKDIR_DIAG2_SE, INVALID_TRACKDIR,  TRACKDIR_DIAG2_NW},
matthijs@1944: 	{TRACKDIR_UPPER_E,  INVALID_TRACKDIR,  INVALID_TRACKDIR,  TRACKDIR_UPPER_W},
matthijs@1944: 	{INVALID_TRACKDIR,  TRACKDIR_LOWER_E,  TRACKDIR_LOWER_W,  INVALID_TRACKDIR},
matthijs@1944: 	{INVALID_TRACKDIR,  INVALID_TRACKDIR,  TRACKDIR_LEFT_S,   TRACKDIR_LEFT_N},
matthijs@1944: 	{TRACKDIR_RIGHT_N,  TRACKDIR_RIGHT_S,  INVALID_TRACKDIR,  INVALID_TRACKDIR}
matthijs@1942: };
matthijs@1942: 
hackykid@2008: const Trackdir _track_enterdir_to_trackdir[][DIAGDIR_END] = { // TODO: replace magic with enums
hackykid@2008: 	{TRACKDIR_DIAG1_NE, INVALID_TRACKDIR,  TRACKDIR_DIAG1_SW, INVALID_TRACKDIR},
hackykid@2008: 	{INVALID_TRACKDIR,  TRACKDIR_DIAG2_SE, INVALID_TRACKDIR,  TRACKDIR_DIAG2_NW},
hackykid@2008: 	{INVALID_TRACKDIR,  TRACKDIR_UPPER_E,  TRACKDIR_UPPER_W,  INVALID_TRACKDIR},
hackykid@2008: 	{TRACKDIR_LOWER_E,  INVALID_TRACKDIR,  INVALID_TRACKDIR,  TRACKDIR_LOWER_W},
hackykid@2008: 	{TRACKDIR_LEFT_N,   TRACKDIR_LEFT_S,   INVALID_TRACKDIR,  INVALID_TRACKDIR},
hackykid@2008: 	{INVALID_TRACKDIR,  INVALID_TRACKDIR,  TRACKDIR_RIGHT_S,  TRACKDIR_RIGHT_N}
hackykid@2008: };
hackykid@2008: 
matthijs@1942: const Trackdir _track_direction_to_trackdir[][DIR_END] = {
matthijs@1944: 	{INVALID_TRACKDIR, TRACKDIR_DIAG1_NE, INVALID_TRACKDIR, INVALID_TRACKDIR,  INVALID_TRACKDIR, TRACKDIR_DIAG1_SW, INVALID_TRACKDIR, INVALID_TRACKDIR},
matthijs@1944: 	{INVALID_TRACKDIR, INVALID_TRACKDIR,  INVALID_TRACKDIR, TRACKDIR_DIAG2_SE, INVALID_TRACKDIR, INVALID_TRACKDIR,  INVALID_TRACKDIR, TRACKDIR_DIAG2_NW},
matthijs@1944: 	{INVALID_TRACKDIR, INVALID_TRACKDIR,  TRACKDIR_UPPER_E, INVALID_TRACKDIR,  INVALID_TRACKDIR, INVALID_TRACKDIR,  TRACKDIR_UPPER_W, INVALID_TRACKDIR},
matthijs@1944: 	{INVALID_TRACKDIR, INVALID_TRACKDIR,  TRACKDIR_LOWER_E, INVALID_TRACKDIR,  INVALID_TRACKDIR, INVALID_TRACKDIR,  TRACKDIR_LOWER_W, INVALID_TRACKDIR},
matthijs@1944: 	{TRACKDIR_LEFT_N,  INVALID_TRACKDIR,  INVALID_TRACKDIR, INVALID_TRACKDIR,  TRACKDIR_LEFT_S,  INVALID_TRACKDIR,  INVALID_TRACKDIR, INVALID_TRACKDIR},
matthijs@1944: 	{TRACKDIR_RIGHT_N, INVALID_TRACKDIR,  INVALID_TRACKDIR, INVALID_TRACKDIR,  TRACKDIR_RIGHT_S, INVALID_TRACKDIR,  INVALID_TRACKDIR, INVALID_TRACKDIR}
matthijs@1942: };
matthijs@1942: 
matthijs@1942: const Trackdir _dir_to_diag_trackdir[] = {
matthijs@1944: 	TRACKDIR_DIAG1_NE, TRACKDIR_DIAG2_SE, TRACKDIR_DIAG1_SW, TRACKDIR_DIAG2_NW,
matthijs@1942: };
matthijs@1942: 
matthijs@1942: const DiagDirection _reverse_diagdir[] = {
matthijs@1944: 	DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_NE, DIAGDIR_SE
matthijs@1942: };
matthijs@1942: 
matthijs@1942: const Trackdir _reverse_trackdir[] = {
matthijs@1944: 	TRACKDIR_DIAG1_SW, TRACKDIR_DIAG2_NW, TRACKDIR_UPPER_W, TRACKDIR_LOWER_W, TRACKDIR_LEFT_N, TRACKDIR_RIGHT_N, INVALID_TRACKDIR, INVALID_TRACKDIR,
matthijs@1944: 	TRACKDIR_DIAG1_NE, TRACKDIR_DIAG2_SE, TRACKDIR_UPPER_E, TRACKDIR_LOWER_E, TRACKDIR_LEFT_S, TRACKDIR_RIGHT_S
matthijs@1942: };
matthijs@1950: 
matthijs@2006: RailType GetTileRailType(TileIndex tile, Trackdir trackdir)
matthijs@1950: {
matthijs@1950: 	RailType type = INVALID_RAILTYPE;
matthijs@2030: 	DiagDirection exitdir = TrackdirToExitdir(trackdir);
matthijs@1950: 	switch (GetTileType(tile)) {
matthijs@1950: 		case MP_RAILWAY:
matthijs@1950: 			/* railway track */
tron@2049: 			type = _m[tile].m3 & RAILTYPE_MASK;
matthijs@1950: 			break;
matthijs@1950: 		case MP_STREET:
matthijs@1950: 			/* rail/road crossing */
matthijs@1950: 			if (IsLevelCrossing(tile))
tron@2049: 				type = _m[tile].m4 & RAILTYPE_MASK;
matthijs@1950: 			break;
matthijs@1950: 		case MP_STATION:
matthijs@1950: 			if (IsTrainStationTile(tile))
tron@2049: 				type = _m[tile].m3 & RAILTYPE_MASK;
matthijs@1950: 			break;
matthijs@1950: 		case MP_TUNNELBRIDGE:
matthijs@1950: 			/* railway tunnel */
tron@2049: 			if ((_m[tile].m5 & 0xFC) == 0) type = _m[tile].m3 & RAILTYPE_MASK;
matthijs@1950: 			/* railway bridge ending */
tron@2049: 			if ((_m[tile].m5 & 0xC6) == 0x80) type = _m[tile].m3 & RAILTYPE_MASK;
matthijs@1950: 			/* on railway bridge */
tron@2049: 			if ((_m[tile].m5 & 0xC6) == 0xC0 && ((DiagDirection)(_m[tile].m5 & 0x1)) == (exitdir & 0x1))
tron@2049: 				type = (_m[tile].m3 >> 4) & RAILTYPE_MASK;
matthijs@1950: 			/* under bridge (any type) */
tron@2133: 			if ((_m[tile].m5 & 0xC0) == 0xC0 && (_m[tile].m5 & 0x1U) != (exitdir & 0x1))
tron@2049: 				type = _m[tile].m3 & RAILTYPE_MASK;
matthijs@1950: 			break;
matthijs@1950: 		default:
matthijs@1950: 			break;
matthijs@1950: 	}
matthijs@1950: 	return type;
matthijs@1950: }