pub type PFNGLMULTITEXCOORDP2UIPROC = Option<unsafe extern "C" fn(texture: GLenum, type_: GLenum, coords: GLuint)>;
enum PFNGLMULTITEXCOORDP2UIPROC { None, Some(unsafe extern "C" fn(_: u32, _: u32, _: u32)), }
No value.
Some value of type T.
T