This allows meta to use push descriptors without disturbing user
push descriptors.
radv_meta_push_descriptor_set differs from vkCmdPushDescriptorSetKHR
in that partial updates are not supported; all descriptors used in
subsequent draw commands must be pushed at the same time.
Signed-off-by: Fredrik Höglund <fredrik@kde.org>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
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