(svn r20049) -Feature: [NewGRF] Add a railtype flag to disallow level crossings per railtype.

1 files changed, 15 insertions, 3 deletions

diff --git a/src/rail.h b/src/rail.h
index 01af4f369..7a05eda73 100644
--- a/src/rail.h
+++ b/src/rail.h
@@ -22,10 +22,12 @@
 
 /** Railtype flags. */
 enum RailTypeFlags {
-	RTF_CATENARY = 0,                  ///< Bit number for drawing a catenary.
+	RTF_CATENARY          = 0,                           ///< Bit number for drawing a catenary.
+	RTF_NO_LEVEL_CROSSING = 1,                           ///< Bit number for disallowing level crossings.
 
-	RTFB_NONE     = 0,                 ///< All flags cleared.
-	RTFB_CATENARY = 1 << RTF_CATENARY, ///< Value for drawing a catenary.
+	RTFB_NONE              = 0,                          ///< All flags cleared.
+	RTFB_CATENARY          = 1 << RTF_CATENARY,          ///< Value for drawing a catenary.
+	RTFB_NO_LEVEL_CROSSING = 1 << RTF_NO_LEVEL_CROSSING, ///< Value for disallowing level crossings.
 };
 DECLARE_ENUM_AS_BIT_SET(RailTypeFlags)
 
@@ -259,6 +261,16 @@ static inline bool HasPowerOnRail(RailType enginetype, RailType tiletype)
 }
 
 /**
+ * Test if a RailType disallows build of level crossings.
+ * @param rt The RailType to check.
+ * @return Whether level crossings are not allowed.
+ */
+static inline bool RailNoLevelCrossings(RailType rt)
+{
+	return HasBit(GetRailTypeInfo(rt)->flags, RTF_NO_LEVEL_CROSSING);
+}
+
+/**
  * Returns the cost of building the specified railtype.
  * @param railtype The railtype being built.
  * @return The cost multiplier.