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/* $Id$ */

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/** @file signal_func.h Functions related to signals. */

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#ifndef SIGNAL_FUNC_H

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#define SIGNAL_FUNC_H

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#include "track_type.h"

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#include "tile_type.h"

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#include "direction_type.h"

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#include "track_type.h"

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#include "company_type.h"

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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 along with the trackdir.

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 */

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static inline byte SignalAlongTrackdir(Trackdir trackdir)

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{

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	extern const byte _signal_along_trackdir[TRACKDIR_END];

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	return _signal_along_trackdir[trackdir];

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}

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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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 */

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static inline byte SignalAgainstTrackdir(Trackdir trackdir)

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{

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	extern const byte _signal_against_trackdir[TRACKDIR_END];

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	return _signal_against_trackdir[trackdir];

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}

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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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 */

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static inline byte SignalOnTrack(Track track)

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{

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	extern const byte _signal_on_track[TRACK_END];

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	return _signal_on_track[track];

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}

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/** State of the signal segment */

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enum SigSegState {

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	SIGSEG_FREE,    ///< Free and has no pre-signal exits or at least one green exit

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	SIGSEG_FULL,    ///< Occupied by a train

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	SIGSEG_PBS,     ///< Segment is a PBS segment

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};

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SigSegState UpdateSignalsOnSegment(TileIndex tile, DiagDirection side, Owner owner);

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void SetSignalsOnBothDir(TileIndex tile, Track track, Owner owner);

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void AddTrackToSignalBuffer(TileIndex tile, Track track, Owner owner);

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void AddSideToSignalBuffer(TileIndex tile, DiagDirection side, Owner owner);

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void UpdateSignalsInBuffer();

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#endif /* SIGNAL_FUNC_H */