/* $Id: signal_func.h 11802 2008-01-09 23:00:59Z smatz $ */

/** @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"

/**
 * 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];
}

bool UpdateSignalsOnSegment(TileIndex tile, DiagDirection side);
void SetSignalsOnBothDir(TileIndex tile, Track track);

#endif /* SIGNAL_FUNC_H */
