The simplest RDO BC7 encoder you could probably make is mode 6 only with just selector quantization. About half of the M6 BC7 block data contains just selector bits, so this is easy and quite effective. You can dial in the overall savings from 5-40%. M6 is too blocky though.
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This is how I started, and it works quite well (so this isn't theory).
2:56 PM - 17 Oct 2018
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