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CGL doesn't have a way to express this directly, unlike EGL WGL and GLX. It might be implementable, but it's never actually worked, and it's a fairly niche feature so we're better off throwing an error if someone attempts it. Reviewed-by: Eric Anholt <eric@anholt.net> Reviewed-by: Emil Velikov <emil.velikov@collabora.com> Reviewed-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com> Signed-off-by: Adam Jackson <ajax@redhat.com>