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Now that PIPE_CAP_TEXTURE_BUFFER_SAMPLER is gone, txf does not require samplers for any texture on any Gallium driver. NIR already requires drivers to ignore sampler_index for non-sampler operation (mainly txf), and nowadays all Gallium drivers ingest NIR. So, document that samplers aren't bound for txf (etc) as part of the Gallium frontend-driver contract. Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com> Suggested-by: Marek Olšák <marek.olsak@amd.com> Reviewed-by: Marek Olšák <marek.olsak@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22223>