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Update README with ASTC mode details

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Rich Geldreich
2026-01-24 00:09:37 -05:00
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README.md
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@@ -104,6 +104,7 @@ Supports adaptive deblocking when transcoding from larger block sizes; this can
XUASTC LDR supports the following ASTC configurations: L/LA/RGB/RGBA CEMs; base+scale or RGB/RGBA direct; base+offset CEMs; Blue Contraction encoding; 1–3 subsets; all partition patterns; and single- or dual-plane modes. Here is the [XUASTC LDR specification](https://github.com/BinomialLLC/basis_universal/wiki/XUASTC-LDR-Specification-v1.0).
Notes:
- Mode #1 (ETC1S) has special support and optimizations for basic temporal supercompression (texture video).
- Modes #3 (UASTC HDR 4x4) and #4 (RDO ASTC HDR 6x6), and #6 (ASTC LDR 4x4-12x12) output 100% standard or plain ASTC texture data (with or without RDO), like any other ASTC encoder. The .KTX2 files are just plain textures.
- The other modes (#1, #2, #5, #7) output compressed data in various custom supercompressed formats, which our transcoder library can convert in real-time to various GPU texture or pixel formats.
- Modes #4 (ASTC HDR 6x6) and #5 (UASTC HDR 6x6) internally use the same unified ASTC HDR 6x6 encoder.