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We'll reuse some of this code for shadow samplers, which are represented by a distinct source in NIR. Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3125>