Files
retroDE_ps2/docs/ch401_fuller_static_frame_closeout.md
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

1.1 KiB

Ch401 — fuller 56-draw static frame

Ch401 retains the accepted Ch400 chronological base, one correctly paired ABE draw, two later-scene anchors, and the proven 24-draw central cluster. The result is 56 authentic draws in 28 bounded epochs, within the existing 32-epoch host/testbench limit.

Simulation

  • 638,022 fragments fed
  • 321,817 fragments passed Z
  • 28 ordered drains
  • zero request drops, color FIFO overflows, or AXI BRESP errors
  • Z mismatches: 0 / 307,200
  • color mismatches: 0 / 128,998

Silicon

No RTL changed after the accepted Ch400 RBF. The 28-epoch board run passed all texture CRC, runtime palette, staging, record-count, drain, and zero-drop gates and returned rc=0.

  • nonzero pixels: 128,998
  • bounds: (36,10)..(599,399)
  • board/simulation MEM SHA-256: 0383cc739aa8e9b921489a3fc1ffca7ab2a48763cb57028d4a90e3ae9a34142f
  • board/simulation PNG SHA-256: a4806d0ba39fcea1b904375f715d11f7a81d1364c78f201f40c1bb5906ac008b

Board and simulation are byte-exact over all 307,200 framebuffer words. Ch401 is accepted on silicon and remains displayed through the LPDDR HDMI scanout.