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/* $Id$ */
/** @file signal_func.h Functions related to signals. */
#ifndef SIGNAL_FUNC_H
#define SIGNAL_FUNC_H
#include "track_type.h"
#include "tile_type.h"
#include "direction_type.h"
#include "track_type.h"
#include "player_type.h"
/**
* Maps a trackdir to the bit that stores its status in the map arrays, in the
* direction along with the trackdir.
*/
static inline byte SignalAlongTrackdir(Trackdir trackdir)
{
extern const byte _signal_along_trackdir[TRACKDIR_END];
return _signal_along_trackdir[trackdir];
}
/**
* Maps a trackdir to the bit that stores its status in the map arrays, in the
* direction against the trackdir.
*/
static inline byte SignalAgainstTrackdir(Trackdir trackdir)
{
extern const byte _signal_against_trackdir[TRACKDIR_END];
return _signal_against_trackdir[trackdir];
}
/**
* Maps a Track to the bits that store the status of the two signals that can
* be present on the given track.
*/
static inline byte SignalOnTrack(Track track)
{
extern const byte _signal_on_track[TRACK_END];
return _signal_on_track[track];
}
/** State of the signal segment */
enum SigSegState {
SIGSEG_FREE, ///< Free and has no pre-signal exits or at least one green exit
SIGSEG_FULL, ///< Occupied by a train
SIGSEG_PBS, ///< Segment is a PBS segment
};
SigSegState UpdateSignalsOnSegment(TileIndex tile, DiagDirection side, Owner owner);
void SetSignalsOnBothDir(TileIndex tile, Track track, Owner owner);
void AddTrackToSignalBuffer(TileIndex tile, Track track, Owner owner);
void AddSideToSignalBuffer(TileIndex tile, DiagDirection side, Owner owner);
void UpdateSignalsInBuffer();
#endif /* SIGNAL_FUNC_H */
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