Files

T

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

2.9 KiB

Raw Blame History

Ch360 audit log - zs640c12: 12-draw shared-texture residency at native 640x480 persistent Z

Scope

Scale Ch359's six-draw shared-texture proof to twelve authentic SH3 draws without increasing feeder-list size:

119471,119684,119897 / 120110,120323,120536 / 120749,120962,121175 / 121388,121601,121814

All draws are PSMT8 tbp=8192, share the byte-identical resident CLUT at cbp=13888, have identical feeder-visible state, and use authentic ZTE=1, GEQUAL, ZMSK=0, PSMZ16S. They form four ordered 204-triangle / 1843-word epochs: one LPDDR texture upload/fill followed by three fail-closed cache reuses.

Fixture And Fidelity Decision

The generator preflight passed native 640x480 bounds, signed-Q legality, state equality, shared texture/CLUT bytes, and all four feeder-list capacities.
Per-triangle auto PSCALE failed the content fidelity gate: isolated epochs 2/3 were 79.4%/81.5% and the full multi-epoch score was 83.6%.
Fixed PSCALE=1024 for every C12 epoch corrected that host-fixture range choice without RTL: isolated epochs 2/3 reached 92.0%/91.1%, while the full capture gate reached ALL=93.4% and MULTI=95.0%, with clut_bad=0.
C12's BIOS and payload comment lines differ from C6, but their non-comment memory words hash identically. The existing Ch359 signoff RBF therefore already contains the correct C12 bootlet contents; no QSF change or GUI fit.

Simulation Proof

Capture/residency: four 204/204 records, one fill, three verified reuses, four fresh drains, no writer overflow, exact 38400 scanout beats/frame.
Real-raster Z integration at REQ_DEPTH=1024: 151160 accepted fragments, 70796 Z passes, zero drops, four ordered scene markers/drains, and exact scoreboards (Z 0/307200, COLOR 0/36022).
Request-FIFO high-water by epoch: 478, 27, 416, 225. The 1024-depth production FIFO remains sufficient; no depth, Z-RMW, LPDDR, clock, SDC, or RTL change is warranted.

Board Closure (2026-07-10)

The Ch359 signoff RBF ad4e8c9627520dcaba9babf2019ca5b28892799e0500f8f3300f4f2a29b5218c remained loaded and was provenance-valid for C12 because the bootlet memory words are identical.
Board host gates: four 204/204 drains, one fill plus three verified reuses, zero drops, 27041 framebuffer beats, and output bounds (84,94)..(367,385) with 36022 nonzero pixels.
Board and zint framebuffer SHA-256 matched exactly: 1309fa4f307b9313231797c75973e5a42108460c19ec0a0c576d4da597d6303e.
Replay-color: 151160 fragments, 70796 persistent-Z updates, 36022 covered pixels, no stray coverage, and 307200/307200 exact framebuffer pixels. Ch360 is closed.

Next Direction

Keep draw-count scaling before motion, but first turn the C12 four-epoch test copies into one parameterized shared-texture residency harness. The next density rung should then be selected from the same census and must retain the fixed-1024 fixture contract unless a measured sweep proves another scale better for the chosen draws.

2.9 KiB Raw Blame History