src/signal_map.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_map.h Slightly cooked access to signals on the map */
  11
  12 #ifndef SIGNAL_MAP_H
  13 #define SIGNAL_MAP_H
  14
  15 #include "stdafx.h"
  16 #include "signal_type.h"
  17 #include "map/rail.h"
  18 #include "pathfinder/railpos.h"
  19
  20 /**
  21  * Sets the state of the signal along the given trackdir.
  22  */
  23 static inline void SetSignalState(TileIndex tile, Trackdir trackdir, SignalState state)
  24 {
  25         if (IsRailwayTile(tile)) {
  26                 SetSignalStateByTrackdir(tile, trackdir, state);
  27         } else {
  28                 maptile_set_tunnel_signal_state(tile, TrackdirToExitdir(trackdir) == GetTunnelBridgeDirection(tile), state);
  29         }
  30 }
  31
  32
  33 /**
  34  * Is a pbs signal present along the trackdir?
  35  * @param tile the tile to check
  36  * @param td the trackdir to check
  37  */
  38 static inline bool HasPbsSignalOnTrackdir(TileIndex tile, Trackdir td)
  39 {
  40         return IsRailwayTile(tile) ?
  41                         HasSignalOnTrackdir(tile, td) && IsPbsSignal(GetSignalType(tile, TrackdirToTrack(td))) :
  42                         maptile_is_rail_tunnel(tile) && maptile_has_tunnel_signal(tile, TrackdirToExitdir(td) == GetTunnelBridgeDirection(tile)) && IsPbsSignal(maptile_get_tunnel_signal_type(tile));
  43 }
  44
  45
  46 /**
  47  * Is a one-way signal blocking the trackdir? A one-way signal on the
  48  * trackdir against will block, but signals on both trackdirs won't.
  49  * @param tile the tile to check
  50  * @param td the trackdir to check
  51  */
  52 static inline bool HasOnewaySignalBlockingTrackdir(TileIndex tile, Trackdir td)
  53 {
  54         if (IsRailwayTile(tile)) {
  55                 return HasSignalOnTrackdir(tile, ReverseTrackdir(td)) &&
  56                         !HasSignalOnTrackdir(tile, td) && IsOnewaySignal(GetSignalType(tile, TrackdirToTrack(td)));
  57         } else if (maptile_is_rail_tunnel(tile)) {
  58                 return maptile_has_tunnel_signal(tile, TrackdirToExitdir(td) != GetTunnelBridgeDirection(tile));
  59         } else {
  60                 return false;
  61         }
  62 }
  63
  64 /**
  65  * Is a one-way signal blocking the trackdir? A one-way signal on the
  66  * trackdir against will block, but signals on both trackdirs won't.
  67  * @param pos the position to check
  68  */
  69 static inline bool HasOnewaySignalBlockingPos(const RailPathPos &pos)
  70 {
  71         return !pos.in_wormhole() && HasOnewaySignalBlockingTrackdir(pos.tile, pos.td);
  72 }
  73
  74 #endif /* SIGNAL_MAP_H */