-extern GLboolean
-_mesa_type_is_packed(GLenum type);
-
-extern GLint
-_mesa_sizeof_type( GLenum type );
-
-extern GLint
-_mesa_sizeof_packed_type( GLenum type );
-
-extern GLint
-_mesa_components_in_format( GLenum format );
-
-extern GLint
-_mesa_bytes_per_pixel( GLenum format, GLenum type );
-
-extern GLboolean
-_mesa_is_legal_format_and_type(const struct gl_context *ctx,
- GLenum format, GLenum type);
-
-extern GLboolean
-_mesa_is_color_format(GLenum format);
-
-extern GLboolean
-_mesa_is_depth_format(GLenum format);