thejayman77
ba74bbd5aa
Per-vertex GS fog end-to-end (gs_stub emit incl. persp_emit5, gs_prim_list_feeder XYZ2->XYZF2 on PRIM.FGE, gs_make_sh3_scheduler_fixture.py F/FGE packing), new fog TBs, fidelity attribution tooling. Functional baseline before removing the dead bilinear lerp8 clamps (Codex: 161-node comb loop -> -0.042ns setup fail). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
81 lines
3.7 KiB
Markdown
81 lines
3.7 KiB
Markdown
# Ch429 — native PSMT4 character recovery
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## Objective
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Recover visible captured geometry that was still absent from the accepted
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Ch428 frame, while preserving authentic draw order and refusing additions
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that merely increase epoch count or worsen the presentation.
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## Deferred PSMT4 postprocess
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`zsrt139f34` appended the existing 18-epoch tiled PSMT4 overlay after the
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Ch428 frame, in its authentic late-frame position. Its 295-epoch production
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RTL replay passed every structural gate and produced framebuffer SHA-256
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`7b167db3927c6e765c464d0e8ddbfb37f23d5b980d87ebdfc9af97b20128e044`.
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The replay also established that the captured overlay is a real contrast
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operation, not an opaque texture: its alpha equation is
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`(Cd-Cs)*0xdc/128 + Cs` with COLCLAMP enabled and source RGB values of 0 or
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24. Applied to the still-underlit reconstructed base, it crushes most of the
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scene to black and worsens the mapped PCSX2 score to MAE 24.0034 / RMSE
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32.9396. The overlay is therefore deferred until the missing illumination
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and base-color population is present; f34 was not deployed.
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## Native 512x1024 PSMT4 support
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A separate captured family of 19 opaque PSMT4 triangle strips covers the
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foreground character body at draw indices 165536 through 172233. The draws
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share TBP 9216, TBW 8, a logical 512x1024 texture, and several authentic CLUT
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banks.
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The coverage planner now accepts explicit PSMT4 selection. The fixture
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generator reconstructs the canonical GS-swizzled 512x1024 PSMT4 local-memory
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image, packs its nibbles into the fixed 262,144-byte texture cache, preserves
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PSM/TBW/TW/TH in TEX0, and samples packed nibbles in the independent software
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reference. Fast-fit scaling now uses the logical texture dimensions.
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Generation is fail-closed. An independent host check confirmed that all
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262,144 emitted texture bytes exactly match the local-memory reconstruction;
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the emitted TEX0 decodes to TBP 1024, TBW 8, PSM `0x14`, TW 9, TH 10. The
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texture CRC is `0x9ecc08f5`.
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## Accepted f36 result
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`zsrt139f35` groups the 19 strips into 13 exact-state/asset epochs.
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`zsrt139f36` inserts those epochs at their authentic position before the
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final opaque draws, CT32 darken, and complete alpha family. The resulting
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frame has 290 epochs.
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Production RTL replay passed with:
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- 1,331,626 fragments fed and 1,311,991 passed;
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- 290 markers and drains;
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- zero fragment drops, color overflows, and AXI errors;
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- Z mismatch 0/307,200 and color mismatch 0/245,437;
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- framebuffer SHA-256
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`102bf7925b859bcacc91172ecdcd1755b4f01210f327ac918a1c8d7954905d2b`.
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Relative to Ch428, the recovered family changes 3,099 source pixels within
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`(319,242)..(361,479)` and restores the visible foreground character-body
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silhouette. On the mapped changed-pixel support its RMSE improves from 15.10
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to 12.82. Whole-frame mapped RMSE improves from 27.6458 to 27.6303, while
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MAE moves narrowly from 18.9378 to 18.9407. This is accepted as authentic
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structural fidelity with a mixed scalar-score result, not described as a
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broad color-fidelity win.
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## Silicon acceptance
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No new compile or RBF was required; the timing-clean Ch423 image remained
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loaded. The DE25 completed all 290 epochs with every texture CRC, palette
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checksum, staged-record count, ordered drain, and zero-drop gate passing.
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The scheduler returned `rc=0`, selected the HDMI line-buffer source, and
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reported 212,673 nonzero pixels, bounds `(0,0)..(511,479)`, sum32
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`0x00e0b761`, and xor32 `0x9622a8a3`.
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The board and production RTL framebuffer files are byte-identical at the
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SHA-256 above. The mapped board score is MAE 18.9407 / RMSE 27.6303, and the
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accepted board image is preserved as
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`captures/gs/silenthill3/extracted/sh3_zsrt139f36_ch429_board.png`.
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Ch429 is accepted on silicon and f36 is the current live HDMI baseline.
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