Trellis quantization has been added to XUBC7 (supercompressed universal BC7) via AC truncation. The feature activates only when the PSNR drop stays within a configurable channel-weighted PSNR window and doesn't fall below a lower limit, providing gains at higher DCT quality levels. The encoder also supports multiple forms of block-level RDO (Rate-Distortion Optimization), porting video compression techniques into GPU texture supercompression.
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