Kenneth Graunke
68ef895674
This patch adds support for transcoding ASTC to BC7 (BPTC) and prefers it over BC3 (DXT5) when hardware supports that format. BC7 is a much newer format (~2009 vs. ~1999) and offers higher quality than the older BC3 format. Furthermore, our encoder seems to be faster. Tapani put together a small benchmark for transcoding a 1024x1024 ASTC texture, and switching from BC3 to BC7 improves performance of that microbenchmark by 25% on my Tigerlake NUC (with hardware ASTC disabled so we can test this path). Presumably, this isn't fundamental to the formats, but rather reflects the speed of our in-tree compressors. So, we should use BC7 where possible. Reviewed-by: Tapani Pälli <tapani.palli@intel.com> Reviewed-by: Emma Anholt <emma@anholt.net> Reviewed-by: Nanley Chery <nanley.g.chery@intel.com> Reviewed-by: Marek Olšák <marek.olsak@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15875>
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