src/signal_func.h

   1 /* $Id$ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * 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.
   6  * 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.
   7  * 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/>.
   8  */
   9
  10 /** @file signal_func.h Functions related to signals. */
  11
  12 #ifndef SIGNAL_FUNC_H
  13 #define SIGNAL_FUNC_H
  14
  15 #include "track_type.h"
  16 #include "tile_type.h"
  17 #include "direction_type.h"
  18 #include "company_type.h"
  19
  20 /**
  21  * Maps a trackdir to the bit that stores its status in the map arrays, in the
  22  * direction along with the trackdir.
  23  */
  24 static inline byte SignalAlongTrackdir(Trackdir trackdir)
  25 {
  26         extern const byte _signal_along_trackdir[TRACKDIR_END];
  27         return _signal_along_trackdir[trackdir];
  28 }
  29
  30 /**
  31  * Maps a trackdir to the bit that stores its status in the map arrays, in the
  32  * direction against the trackdir.
  33  */
  34 static inline byte SignalAgainstTrackdir(Trackdir trackdir)
  35 {
  36         extern const byte _signal_against_trackdir[TRACKDIR_END];
  37         return _signal_against_trackdir[trackdir];
  38 }
  39
  40 /**
  41  * Maps a Track to the bits that store the status of the two signals that can
  42  * be present on the given track.
  43  */
  44 static inline byte SignalOnTrack(Track track)
  45 {
  46         extern const byte _signal_on_track[TRACK_END];
  47         return _signal_on_track[track];
  48 }
  49
  50 /** State of the signal segment */
  51 enum SigSegState {
  52         SIGSEG_FREE,    ///< Free and has no pre-signal exits or at least one green exit
  53         SIGSEG_FULL,    ///< Occupied by a train
  54         SIGSEG_PBS,     ///< Segment is a PBS segment
  55 };
  56
  57 SigSegState UpdateSignalsOnSegment(TileIndex tile, DiagDirection side, Owner owner);
  58 void SetSignalsOnBothDir(TileIndex tile, Track track, Owner owner);
  59 void AddTrackToSignalBuffer(TileIndex tile, Track track, Owner owner);
  60 void AddSideToSignalBuffer(TileIndex tile, DiagDirection side, Owner owner);
  61 void UpdateSignalsInBuffer();
  62
  63 #endif /* SIGNAL_FUNC_H */