pub type PFNGLBLENDEQUATIONSEPARATEIARBPROC = Option<unsafe extern "C" fn(buf: GLuint, modeRGB: GLenum, modeAlpha: GLenum)>;
enum PFNGLBLENDEQUATIONSEPARATEIARBPROC { None, Some(unsafe extern "C" fn(_: u32, _: u32, _: u32)), }
No value.
Some value of type T.
T