(svn r11802) -Fix [FS#716]: do not crash trains when leaving depot to a very long track

-Codechange: use dedicated pathfinder for signal updating, resulting in better performance and possible future improvements

1 files changed, 12 insertions, 0 deletions

diff --git a/src/rail_map.h b/src/rail_map.h
index 9b9bc16ef..d4f63c72b 100644
--- a/src/rail_map.h
+++ b/src/rail_map.h
@@ -375,6 +375,18 @@ static inline SignalState GetSignalStateByTrackdir(TileIndex tile, Trackdir trac
 		SIGNAL_STATE_GREEN : SIGNAL_STATE_RED;
 }
 
+/**
+ * Sets the state of the signal along the given trackdir.
+ */
+static inline void SetSignalStateByTrackdir(TileIndex tile, Trackdir trackdir, SignalState state)
+{
+	if (state == SIGNAL_STATE_GREEN) { // set 1
+		SetSignalStates(tile, GetSignalStates(tile) | SignalAlongTrackdir(trackdir));
+	} else {
+		SetSignalStates(tile, GetSignalStates(tile) & ~SignalAlongTrackdir(trackdir));
+	}
+}
+
 
 /**
  * Return the rail type of tile, or INVALID_RAILTYPE if this is no rail tile.