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Because 0 is no longer a recognizable value (it's NEVER, which isn't a good default), we add an emit_alpha_test bool to tell the back-end when to bother alpha testing. This lets us only touch crocus with the change. Reviewed-by: Caio Oliveira <caio.oliveira@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14157>