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thejayman77 ba74bbd5aa Snapshot: fog implementation + fidelity tooling baseline (pre bilinear-clamp fix)

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>

2026-07-20 19:56:46 -04:00

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Ch364 Audit Log - Mixed Texture Rebind And Residency

Scope

Native 640x480 persistent-Z composite of 28 ordered authentic SH3 draws.
Four early single-draw texture/CLUT rebind epochs (5328, 11671, 77112, 89164) followed by the 24-draw tbp=8192 cluster in eight 204-triangle feeder lists.
Twelve epochs total: five upload/fill operations and seven consecutive, fail-closed verified reuses of the final resident texture.

Fixture Contract

gs_make_sh3_scheduler_fixture.py now accepts --group-sizes, an explicit ordered epoch partition. Every multi-draw group must have identical feeder-visible state and byte-identical texture/CLUT data; reuse is emitted only when the immediately preceding descriptor leaves those same bytes resident.
The selected partition is 1,1,1,1,3,3,3,3,3,3,3,3. It passed authentic ordering, native bounds, state, texture/CLUT, staging-capacity, and depth-state gates.
The Ch364 BIOS and payload memory words hash identically to Ch363 MT5. The existing GUI-fitted RBF is therefore provenance-valid; no RTL, QSF, SDC, GUI compile, or RBF reload was required.

Simulation Proof

Capture/residency: PASS. Five CRC-verified fills, seven verified reuses, 12 ordered fresh drains, no writer overflow or scanout underflow, and exactly 38,400 scanout beats/frame.
Texture oracle: ALL 105761/110544 (95.7%), MULTI 40756/42861 (95.1%), clut_bad=0.
Real Z integration: PASS. 465,250 fragments fed, 214,897 persistent-Z updates, zero drops, 12 markers/drains, exact Z 0/307200, and exact color 0/110324.
Request FIFO high-water by epoch: 415,401,64,222,341,21,112,166,72,176,311,240; all remain bounded below the 1024-entry production FIFO.

Board Closure

Board host gate: all five texture uploads passed CRC, all seven cache reuses verified the resident CRC, all 12 drains returned their expected records, and every epoch reported zero fragment drops.
Final board framebuffer: 110,324 nonzero pixels, bounds (36,10)..(568,399), sum 0x61884052, xor 0x802cf68e.
Board and zint framebuffer SHA-256 match exactly: fdff2f34eac22ee140b64d8fac129627549bbb0f6db37d4b91807a9058e47a04.
Replay-color is exact: 465,250 fragments, 214,897 Z-pass updates, 110,324 covered pixels, no stray coverage, and 307200/307200 exact framebuffer pixels.

Result

Ch364 is closed on silicon: 28 authentic SH3 draws, five texture/CLUT bindings, seven verified residency reuses, native 640x480 scanout, and persistent depth all agree with integration simulation and the independent replay oracle.

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