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/* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @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 "company_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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