ad609bf55a
It is kinda surprising that image2 = fromPlanar(image, 2, NULL) mapImage(..., image2, ...) does not map the third plane. This implements that behavior in the case where the DRI frontend lowers the multi-planar textures. In the case it doesn't this would need driver support. AFAIU at least etnaviv is impacted, and while it looks possible, I don't have the etnaviv knowledge to implement it. Instead of silently returning weird results (either always plane 0 or possibly something interleaved) this adds an error return on mapping multi-planar textures otherwise. Reviewed-by: Marek Olšák <marek.olsak@amd.com> Reviewed-by: Eric Anholt <eric@anholt.net> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5200>
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