+/* Must match MapBufferRange interface (for convenience) */
+#define MAP_READ GL_MAP_READ_BIT
+#define MAP_WRITE GL_MAP_WRITE_BIT
+#define MAP_ASYNC GL_MAP_UNSYNCHRONIZED_BIT
+#define MAP_PERSISTENT GL_MAP_PERSISTENT_BIT
+#define MAP_COHERENT GL_MAP_COHERENT_BIT
+/* internal */
+#define MAP_INTERNAL_MASK (0xff << 24)
+#define MAP_RAW (0x01 << 24)
+