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Rich Geldreich
2026-01-24 00:11:20 -05:00
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@@ -73,7 +73,7 @@ Supported Texture Compression/Supercompression Modes
1. **[ETC1S](https://github.com/BinomialLLC/basis_universal/wiki/.basis-File-Format-and-ETC1S-Texture-Video-Specification)**: A roughly .3-3bpp low to medium quality supercompressed mode based on a subset of [ETC1](https://en.wikipedia.org/wiki/Ericsson_Texture_Compression) called "ETC1S". This mode supports variable quality vs. file size levels (like JPEG), alpha channels, built-in compression, and texture arrays optionally compressed as a video sequence using skip blocks ([Conditional Replenishment](https://en.wikipedia.org/wiki/MPEG-1)). This mode can be rapidly transcoded to all of the supported LDR texture formats.
2. **[UASTC LDR 4x4](https://github.com/BinomialLLC/basis_universal/wiki/UASTC-LDR-4x4-Texture-Specification)**: An 8 bits/pixel LDR high quality mode. UASTC LDR is a 19 mode subset of the standard [ASTC LDR](https://en.wikipedia.org/wiki/Adaptive_scalable_texture_compression) 4x4 (8bpp) texture format, but with a custom block format containing transcoding hints. Transcoding UASTC LDR to ASTC LDR and BC7 are particularly fast and simple, because UASTC LDR is a common subset of both BC7 and ASTC. The transcoders for the other texture formats are accelerated by several format-specific hint bits present in each UASTC LDR block.
2. **[UASTC LDR 4x4](https://github.com/BinomialLLC/basis_universal/wiki/UASTC-LDR-4x4-Texture-Specification)**: An 8 bits/pixel LDR high quality mode. UASTC LDR is a 19 mode subset of the standard [ASTC LDR](https://en.wikipedia.org/wiki/Adaptive_scalable_texture_compression) 4x4 (8bpp) texture format, but with a custom block format containing transcoding hints. Transcoding UASTC LDR to ASTC LDR and BC7 is particularly fast and simple, because UASTC LDR is a common subset of both BC7 and ASTC. The transcoders for the other texture formats are accelerated by several format-specific hint bits present in each UASTC LDR block.
This mode supports an optional [Rate-Distortion Optimized (RDO)](https://en.wikipedia.org/wiki/Rate%E2%80%93distortion_optimization) post-process stage that conditions the encoded UASTC LDR texture data in the .KTX2/.basis file so it can be more effectively LZ compressed. More details [here](https://github.com/BinomialLLC/basis_universal/wiki/UASTC-implementation-details).