pub type PFNGLFRAMEBUFFERPIXELLOCALSTORAGESIZEEXTPROC = Option<unsafe extern "C" fn(target: GLuint, size: GLsizei)>;
enum PFNGLFRAMEBUFFERPIXELLOCALSTORAGESIZEEXTPROC { None, Some(unsafe extern "C" fn(_: u32, _: i32)), }
No value.
Some value of type T.
T