The vertex order is either clockwise or counterclockwise. We can just store a "ccw" boolean rather than GLenum values. I don't want to use GLenums in a Vulkan driver, and even in GL a simple boolean works fine. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Timothy Arceri <timothy.arceri@collabora.com> Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>