# 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.
