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>
70 lines
3.1 KiB
Markdown
70 lines
3.1 KiB
Markdown
# Ch433 — UV-optimized STQ packing
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## Root cause
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The repaired Ch432 sampler restored the missing perspective-bilinear samples,
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but the f19 base scene still showed granular spatial misregistration against
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its independent floating-point reference. Post-repair isolation rejected a
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13-bit reciprocal table and rejected nearest filtering: both worsened the
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software-reference and PCSX2 scores.
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The remaining fixture path used `--fast-fit-scale`. That shortcut selected
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the largest representable common S/T/Q scale, normally 6144, even though the
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scheduler generator already had a per-triangle search that scores packed RTL
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UVs against authentic floating-point UVs. A common scale cancels only at
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infinite precision; vertex quantization, integer gradients, and reciprocal
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quantization make the choice observable.
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## One-variable repair
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`zsrt139f43` retains f19's exact 766-draw population, 254 chronological state
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groups, 125 capacity epochs, native 12.4 geometry, textures, palettes, fog,
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bilinear reference, Z state, and alpha state. Only `--fast-fit-scale` was
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removed. The optimizer selected scales from 0.375 through 6144 rather than
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forcing almost every triangle to 6144.
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The coverage planner no longer emits the shortcut by default. It remains
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available through an explicit planner `--fast-fit-scale` option for quick
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diagnostic fixture generation.
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## Production result
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The full registered-gradient f43 replay passed all 125 epochs:
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- 282,363 fragments fed and 232,326 passed Z;
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- zero drops, color overflows, and AXI errors;
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- 125 complete markers and drains;
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- final Z mismatch 0/307,200 and color mismatch 0/176,888.
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Against its independent software reference, f43 improves from f19's
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MAE/RMSE 8.7494/18.7008 to 4.1633/11.9970. Its mapped PCSX2 score improves
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from 18.3393/25.8374 to 17.7172/24.8787.
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`zsrt139f44` substitutes the optimized f43 base slices into the complete f42
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composition while preserving the chronology-correct PSMT4 character,
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direct-color highlights, and alpha/postprocess population. The production
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replay passed all 292 epochs with 2,339,405 fragments fed, 2,285,783 passed,
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zero drops/errors, and exact final Z and color scoreboards. Relative to f42,
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87,282 pixels change. The mapped PCSX2 score improves from
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15.0765/21.9717 to 14.8127/21.5567.
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## Silicon acceptance
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No compile was required. The timing-clean Ch432 RBF ran both asset-only
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fixtures. f43 passed all 125 runtime gates and matched simulation byte for
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byte at SHA-256
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`f4ae82153791a66ae8ed7c4b3dd01f609b9706e826e971311c602181f8a08bc7`.
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The complete f44 board run passed all 292 texture, palette, staging, drain,
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and zero-drop gates. It reported 240,492 nonzero words, bounds
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`(0,0)..(511,479)`, sum32 `0x96f07662`, xor32 `0x0a031310`, and selected the
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HDMI line-buffer source. Its 307,200-word framebuffer is byte-identical to
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production simulation at SHA-256
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`3f492ab65c12415f4d0cd1aeafc64072870fd43bed237be4a923efbce30d2081`.
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The accepted board image is
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`captures/gs/silenthill3/extracted/sh3_zsrt139f44_ch433_board.png`; the mapped
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comparison is
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`captures/gs/silenthill3/extracted/recon/sh3_zsrt139f44_ch433_board_mapped.png`.
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Ch433 is accepted, and f44 is the current live HDMI baseline.
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