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-rw-r--r--src/viewport.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/src/viewport.h b/src/viewport.h
index 5f511128d..4bd9fec5a 100644
--- a/src/viewport.h
+++ b/src/viewport.h
@@ -44,6 +44,17 @@ static inline void MaxZoomInOut(int how, Window *w)
while (DoZoomInOutWindow(how, w)) {};
}
+/**
+ * Some values for constructing bounding boxes (BB). The Z positions under bridges are:
+ * z=0..5 Everything that can be built under low bridges.
+ * z=6 reserved, currently unused.
+ * z=7 Z separator between bridge/tunnel and the things under/above it.
+ */
+enum {
+ BB_HEIGHT_UNDER_BRIDGE = 6, ///< Everything that can be built under low bridges, must not exceed this Z height.
+ BB_Z_SEPARATOR = 7, ///< Separates the bridge/tunnel from the things under/above it.
+};
+
void OffsetGroundSprite(int x, int y);
void DrawGroundSprite(SpriteID image, SpriteID pal);