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New BC7 CPU encoder, significantly improves speed and quality.
Uses a mix of existing techniques (PCA + k-means clustering/LLS refinement) and a new one that tries to trade index precision for endpoint precision, and processes 8 blocks at once using SSE2.
Based on benchmarks against every other BC7 compressor that I'm aware of (both existing DirectXTex encoders, FasTC, Intel ISPC Texture Compressor, NVTT, Compressonator, bc7_gpu), it's roughly tied for best quality with NVTT and Compressonator, but is about 35x as fast as both of those and 10x as fast as the existing BC7 CPU encoder.