diff options
Diffstat (limited to 'src/rail.c')
| -rw-r--r-- | src/rail.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/src/rail.c b/src/rail.c new file mode 100644 index 000000000..c4b20de27 --- /dev/null +++ b/src/rail.c @@ -0,0 +1,132 @@ +/* $Id$ */ + +#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 */ +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_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 */ +}; + +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. */ +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. */ +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 */ +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_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} +}; + +const Trackdir _track_enterdir_to_trackdir[][DIAGDIR_END] = { // TODO: replace magic with enums + {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} +}; + +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} +}; + +const Trackdir _dir_to_diag_trackdir[] = { + TRACKDIR_X_NE, TRACKDIR_Y_SE, TRACKDIR_X_SW, TRACKDIR_Y_NW, +}; + + +RailType GetTileRailType(TileIndex tile, Trackdir trackdir) +{ + switch (GetTileType(tile)) { + case MP_RAILWAY: + return GetRailType(tile); + + case MP_STREET: + /* rail/road crossing */ + if (IsLevelCrossing(tile)) return GetRailTypeCrossing(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; +} |