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This patch adds compressed representations of uniform grayscale blocks to piglit, in the ETC1 and FXT1 compression formats. Although they don't exercise the full capabilities of these compression formats, they should be sufficient to create basic tests of compression functionality without having to rely on the GL implementation to do compression on the fly. Reviewed-by: Brian Paul <brianp@vmware.com> Acked-by: Eric Anholt <eric@anholt.net> v2: Add S3TC.
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