1 files changed, 14 insertions, 0 deletions
diff --git a/tile.c b/tile.c
new file mode 100644
index 000000000..f8641ca98
--- /dev/null
+++ b/tile.c
@@ -0,0 +1,14 @@
+#include "tile.h"
+
+void SetMapExtraBits(TileIndex tile, byte bits)
+{
+	assert(tile < MapSize());
+	_map_extra_bits[tile >> 2] &= ~(3 << ((tile & 3) * 2));
+	_map_extra_bits[tile >> 2] |= (bits&3) << ((tile & 3) * 2);
+}
+
+uint GetMapExtraBits(TileIndex tile)
+{
+	assert(tile < MapSize());
+	return (_map_extra_bits[tile >> 2] >> (tile & 3) * 2) & 3;
+}