pub unsafe extern "C" fn CVDisplayLinkCreateWithOpenGLDisplayMask(
mask: CGOpenGLDisplayMask,
displayLinkOut: *mut CVDisplayLinkRef
) -> CVReturnpub unsafe extern "C" fn CVDisplayLinkCreateWithOpenGLDisplayMask(
mask: CGOpenGLDisplayMask,
displayLinkOut: *mut CVDisplayLinkRef
) -> CVReturn