e6da726f7b
Resolved the "colours look odd" channel-order/sRGB question for k_8_8_8_8 (T8aD 2D UI textures) with no emulator run: - sRGB: Canary's Vulkan host-format table maps plain k_8_8_8_8 to R8G8B8A8_UNORM and contains no R8G8B8A8_SRGB anywhere — gamma is a separate explicit EDRAM path. So these are raw linear bytes; apply no sRGB/gamma decode. - Channel order: measured 789 real disc textures — byte0 is the opaque alpha (==0xFF-dominant) in 97% — so on-disk is ARGB. Cross-checked against xenia-rs decode_k8888_tiled, the Canary-validated M1/M2 path, which nets the same [A,R,G,B]->[R,G,B,A]. sylpheed-formats is correct. Promotes the k8888 entry HYPOTHESIS -> CONFIRMED; INDEX updated. XPR2 skybox tiling + viewer display-gamma remain separate open items. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
30 lines
1.8 KiB
Markdown
30 lines
1.8 KiB
Markdown
# RE knowledge index
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Confidence: ✅ `CONFIRMED` · 🟡 `PROBABLE` · ❔ `HYPOTHESIS`. See [README](README.md).
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Formats we've already reversed are, for now, **documented by their parser + disc round-trip
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tests** (the executable spec) rather than a prose file — the "Spec" column points there.
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Promote to a prose `structures/…md` file when a format needs behavioural notes beyond layout.
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## Data structures / formats
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| Format | Conf. | Spec (parser + tests) | Notes |
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|--------|-------|-----------------------|-------|
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| IPFB `.pak` archive | ✅ | `sylpheed-formats/src/pak.rs` + `tests/pak_idxd_disc.rs` | header + 12-byte TOC, Z1/zlib payloads |
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| name-hash (TOC keys) | ✅ | `sylpheed-formats/src/hash.rs` | Barrett-reduction hash; recovers original paths |
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| IDXD object/table | ✅ | `sylpheed-formats/src/idxd.rs` | self-describing; ship/weapon stats verified vs known values |
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| XPR2 texture + cubemap | 🟡 | `sylpheed-formats/src/texture.rs` | de-tile + A8R8G8B8; **colours unverified** (dynamic item) |
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| T8aD 2D texture | 🟡 | `sylpheed-formats/src/t8ad.rs` | ~85% decode; **colours ✅ CONFIRMED** ([k8888](structures/texture-color-k8888.md)); ~15% variants deferred |
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| RATC bundle | 🟡 | `sylpheed-formats/src/ratc.rs` | child listing confirmed; one level deep |
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| LSTA sprite list | 🟡 | `sylpheed-formats/src/lsta.rs` | inline T8aD frames |
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| IXUD subtitle | 🟡 | `sylpheed-formats/src/ixud.rs` | timed cues; **movie↔track link unknown** (dynamic item) |
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| Fonts (ttf/otf/ttc) | ✅ | `sylpheed-formats/src/font.rs` | standard OpenType, parsed via ttf-parser |
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## Functions / code paths
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_None documented yet — populated during the dynamic-RE phase._
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| Function | Conf. | Reimpl. | Summary |
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|----------|-------|---------|---------|
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| — | — | — | — |
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