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Rich Geldreich
2026-01-19 16:32:10 -05:00
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@@ -19,7 +19,7 @@ The system supports seven modes (or codecs):
4. **ASTC HDR 6x6 (with or without RDO)**: Standard ASTC HDR 6x6
5. **UASTC HDR 6x6 Intermediate ("GPU Photo")**: Supercompressed ASTC HDR 6x6
6. **ASTC LDR 4x4-12x12 (all 14 standard ASTC block sizes)**: Standard ASTC LDR 4x4-12x12
7. **XUASTC LDR 4x4-12x12 (all 14 standard ASTC block sizes)**: Supercompressed ASTC LDR 4x4-12x12, very high quality, utilizes weight grid ([DCT - Discrete Cosine Transform](https://grokipedia.com/page/Discrete_cosine_transform)) for very high compression ratios
7. **XUASTC LDR 4x4-12x12 (all 14 standard ASTC block sizes)**: Supercompressed ASTC LDR 4x4-12x12, very high quality, utilizes Weight Grid ([DCT - Discrete Cosine Transform](https://grokipedia.com/page/Discrete_cosine_transform)) for very high compression ratios
The C/C++ encoder and transcoder libraries can be compiled to native code or WebAssembly (web or WASI), and all encoder/transcoder features can be accessed from JavaScript via a C++ wrapper library which optionally supports [WASM multithreading](https://web.dev/articles/webassembly-threads) for fast encoding in the browser. [WASM WASI](https://wasi.dev/) builds, for the command line tool and the encoder/transcoder as a WASI module using a pure C API, are also supported.
@@ -93,7 +93,7 @@ The ASTC HDR decoder, used in the transcoder module, supports the entire ASTC HD
The ASTC LDR decoder, used in the transcoder module, supports the entire standard ASTC LDR format.
7. **XUASTC LDR 4x4-12x12**: Supercompressed ASTC with weight grid DCT. Bitrate ranges between approximately .3-5.7bpp, depending on profile, block size, and weight grid DCT quality settings. Supports context-based range/arithmetic coding (for higher ratios), Zstd (for faster transcoding), or a hybrid profile using both. Supports all 14 ASTC block sizes. Transcodable to all other supported LDR texture formats. Certain common block sizes (4x4, 6x6, and 8x6) have specializations for particularly fast transcoding directly to BC7.
7. **XUASTC LDR 4x4-12x12**: Supercompressed ASTC with Weight Grid DCT. Bitrate ranges between approximately .3-5.7bpp, depending on profile, block size, and Weight Grid DCT quality settings. Supports context-based range/arithmetic coding (for higher ratios), Zstd (for faster transcoding), or a hybrid profile using both. Supports all 14 ASTC block sizes. Transcodable to all other supported LDR texture formats. Certain common block sizes (4x4, 6x6, and 8x6) have specializations for particularly fast transcoding directly to BC7.
Supported ASTC configurations: L/LA/RGB/RGBA CEM's, base+scale or RGB/RGBA direct, base+ofs CEM's, Blue Contraction encoding, 1-3 subsets, all partition patterns, single or dual plane. Here is the [XUASTC LDR specification](https://github.com/BinomialLLC/basis_universal/wiki/XUASTC-LDR-Specification-v1.0).