We're focusing on very high quality with RDO BC7. We're using around half the modes. We use our ISPC vectorized BC7 encoder to feed the following RDO stages.
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We're currently using selector/endpoint quantization followed by Lagrangian optimization using a simple LZ model (like our RDO BC1 codec does). There are other methods, but I know this approach works well (crunch/Basis have proven that).
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