+ /* create a RenderTarget wrapping an existing FBO.
+ * At this point this is just a hack with limited functionality.
+ * Calls which return textures might return 0. get_width/get_height
+ * will return whatever is passed here as xsz/ysz. resize will not do
+ * anything.
+ */
+ bool create_wrap_fbo(unsigned int fbo, int xsz, int ysz);