pub type PFNGLDISPATCHCOMPUTEPROC = Option<unsafe extern "C" fn(num_groups_x: GLuint, num_groups_y: GLuint, num_groups_z: GLuint)>;
enum PFNGLDISPATCHCOMPUTEPROC { None, Some(unsafe extern "C" fn(_: u32, _: u32, _: u32)), }
No value.
Some value of type T.
T