As far as I can tell, ASTC doesn’t use BC7-style pbits. Instead it has various new tricks for encoding endpoint colors. pbits (where endpoint components share the same LSB) are quite effective if used correctly.
ASTC’s partition patterns are ugly:https://www.google.com/amp/s/rockets2000.wordpress.com/2018/01/09/astc-partitions/amp/ …
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Many of the partition patterns for 4x4 blocks look useless for all practical purposes.
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Wow. So many of those look ... useless?
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Yup, exactly.
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It’s still early but my gut feeling so far is that ASTC is flawed/unbalanced. From experience with BC7, 3+ subsets aren’t necessary, and not all partition patterns are made equal. ASTC throws the kitchen sink at the problem and hopes for the best.
End of conversation
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