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Rich Geldreich
2026-01-24 00:04:29 -05:00
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@@ -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 ("GPU Photo LDR/SDR")**: XUASTC LDR 4x4–12x12 (“GPU Photo LDR/SDR”): Supercompressed ASTC with **Weight Grid DCT**, supporting all 14 standard ASTC block sizes. Bitrates range from approximately 0.3–5.7 bpp, depending on content, profile, block size, windowed RDO, and Weight Grid DCT quality settings. Typical XUASTC LDR 4×4 (**8 bpp in memory**) transmission/on-disk bitrate with Weight Grid DCT (where it is least effective) is **1.15–3.5 bpp (typical ≈2.25 bpp)**, with larger block sizes achieving even lower usable bitrates, down to approximately 0.3 bpp.
7. **XUASTC LDR 4x4-12x12 ("GPU Photo LDR/SDR")**: Supercompressed ASTC with **Weight Grid DCT**, supporting all 14 standard ASTC block sizes. Bitrates range from approximately 0.3–5.7 bpp, depending on content, profile, block size, windowed RDO, and Weight Grid DCT quality settings. Typical XUASTC LDR 4×4 (**8 bpp in memory**) transmission/on-disk bitrate with Weight Grid DCT (where it is least effective) is **1.15–3.5 bpp (typical ≈2.25 bpp)**, with larger block sizes achieving even lower usable bitrates, down to approximately 0.3 bpp.
Supports three profiles: context-based range/arithmetic coding (for higher compression ratios), Zstd (for faster and simpler transcoding), or a hybrid profile using both approaches. Transcodable to all other supported LDR texture formats, including fully featured (all 8 modes, all dual-plane channel configurations, all mode settings) BC7. Certain common block sizes (4×4, 6×6, and 8×6) have specializations for particularly fast transcoding directly to BC7, bypassing analytical BC7 encoding (using [bc7f](https://github.com/BinomialLLC/basis_universal/wiki/Transcoder-Internals-%E2%80%90-Analytical-Real%E2%80%90Time-Encoders)) entirely for the most common ASTC configurations (solid color and single-subset CEMs).