+ /**
+ * Level zero image dimensions. These dimensions correspond to the
+ * physical layout of data in memory. Accordingly, they account for the
+ * extra width, height, and or depth that must be allocated in order to
+ * accommodate multisample formats, and they account for the extra factor
+ * of 6 in depth that must be allocated in order to accommodate cubemap
+ * textures.
+ */
+ GLuint physical_width0, physical_height0, physical_depth0;
+