pub type PFNGLVDPAUINITNVPROC = Option<unsafe extern "C" fn(vdpDevice: *const c_void, getProcAddress: *const c_void)>;
enum PFNGLVDPAUINITNVPROC { None, Some(unsafe extern "C" fn(_: *const c_void, _: *const c_void)), }
No value.
Some value of type T.
T