Vulkan drivers that use nir_lower_blend need to translate Vulkan enums to the
common (non-Vulkan) versions used in nir_lower_blend. We don't need to duplicate
that boilerplate in every VK driver that uses nir_lower_blend, move panvk's
versions to common code so we can use them in agxv. I suspect powervr wants this
too.
It might be useful to also share the logic to translate vk_color_blend_state
to nir_lower_blend_options wholesale, but panvk wouldn't use it and agxv is
downstream so it wouldn't have any in-tree users. So I'll keep that part
vendored (for now). For now, let's share the easy win of the enum translation.
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Italo Nicola <italonicola@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24076>
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