pub type PFNGLUNIFORM3I64VARBPROC = Option<unsafe extern "C" fn(location: GLint, count: GLsizei, value: *const GLint64)>;
enum PFNGLUNIFORM3I64VARBPROC { None, Some(unsafe extern "C" fn(_: i32, _: i32, _: *const i64)), }
No value.
Some value of type T.
T