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  * Is a pbs signal present along the trackdir?
  47  * @param pos the position to check
  48  */
  49 static inline bool HasPbsSignalAlongPos(const RailPathPos &pos)
  50 {
  51         return !pos.in_wormhole() && HasPbsSignalOnTrackdir(pos.tile, pos.td);
  52 }
  53
  54 /**
  55  * Is a pbs signal present against the trackdir?
  56  * @param pos the position to check
  57  */
  58 static inline bool HasPbsSignalAgainstPos(const RailPathPos &pos)
  59 {
  60         return !pos.in_wormhole() && HasPbsSignalOnTrackdir(pos.tile, ReverseTrackdir(pos.td));
  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 tile the tile to check
  68  * @param td the trackdir to check
  69  */
  70 static inline bool HasOnewaySignalBlockingTrackdir(TileIndex tile, Trackdir td)
  71 {
  72         if (IsRailwayTile(tile)) {
  73                 return HasSignalOnTrackdir(tile, ReverseTrackdir(td)) &&
  74                         !HasSignalOnTrackdir(tile, td) && IsOnewaySignal(GetSignalType(tile, TrackdirToTrack(td)));
  75         } else if (maptile_is_rail_tunnel(tile)) {
  76                 return maptile_has_tunnel_signal(tile, TrackdirToExitdir(td) != GetTunnelBridgeDirection(tile));
  77         } else {
  78                 return false;
  79         }
  80 }
  81
  82 /**
  83  * Is a one-way signal blocking the trackdir? A one-way signal on the
  84  * trackdir against will block, but signals on both trackdirs won't.
  85  * @param pos the position to check
  86  */
  87 static inline bool HasOnewaySignalBlockingPos(const RailPathPos &pos)
  88 {
  89         return !pos.in_wormhole() && HasOnewaySignalBlockingTrackdir(pos.tile, pos.td);
  90 }
  91
  92 #endif /* SIGNAL_MAP_H */