pub type PFNGLPROGRAMUNIFORM2UIPROC = Option<unsafe extern "C" fn(program: GLuint, location: GLint, x: GLuint, y: GLuint)>;
enum PFNGLPROGRAMUNIFORM2UIPROC { None, Some(unsafe extern "C" fn(_: u32, _: i32, _: u32, _: u32)), }
No value.
Some value of type T.
T