pub type PFNGLGENNAMESAMDPROC = Option<unsafe extern "C" fn(identifier: GLenum, num: GLuint, names: *mut GLuint)>;
enum PFNGLGENNAMESAMDPROC { None, Some(unsafe extern "C" fn(_: u32, _: u32, _: *mut u32)), }
No value.
Some value of type T.
T