type EglDebugMessageControlFun = unsafe extern "system" fn(proc: Option<unsafe extern "system" fn(error: Enum, command: *const c_char, message_type: u32, thread_label: *const c_void, object_label: *const c_void, message: *const c_char)>, attrib_list: *const Attrib) -> c_int;Available on
gles and neither Windows nor webgl only.