e05930511b
Drivers may be able to optimize cases where blending is enabled but the destination colour is not used. This helps detect that case. Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Reviewed-by: Eric Anholt <eric@anholt.net> Reviewed-by: Marek Olšák <marek.olsak@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6407>