extern GLboolean
_mesa_is_depthstencil_format(GLenum format);
+extern GLboolean
+_mesa_is_depth_or_stencil_format(GLenum format);
+
extern GLboolean
_mesa_is_dudv_format(GLenum format);
+extern GLboolean
+_mesa_is_compressed_format(GLcontext *ctx, GLenum format);
extern GLvoid *
_mesa_image_address( GLuint dimensions,