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>
84 lines
3.7 KiB
Markdown
84 lines
3.7 KiB
Markdown
# Ch428 — missing blended population and logical 256x256 PSMT8
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## Objective
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Recover captured blended geometry omitted from the Ch427 baseline without
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returning to draw-count churn: census the missing PSMT8 population, preserve
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dump chronology, reject families that do not improve the PCSX2 comparison,
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and require production RTL/silicon identity for any accepted addition.
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## Population census
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The frame contains two previously omitted PSMT8 ABE families before the final
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opaque scene draws:
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- 70 triangle-strip draws interleaved with the 766 accepted opaque strips;
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- 240 triangle-list draws using a logical 256x256 PSMT8 texture, concentrated
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on the foreground character at draw indices 172601 through 175947.
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The coverage planner now supports explicit ABE inclusion, primitive subsets,
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and maximum draw-index boundaries while retaining its historical opaque-strip
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default.
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## Rejected interleaved-strip experiment
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`zsrt139f30` inserted all 70 missing ABE strips in authentic dump order and
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then retained the accepted CT32 and 93-draw alpha families. Its 307-epoch
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production RTL replay passed every structural gate and produced framebuffer
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SHA-256
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`5ec8549ab3b88d429403e5abe1a5074bd329eac576ed87421174b92c1dfe28ae`.
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The addition changed only 836 pixels and slightly worsened the mapped PCSX2
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score to MAE 18.9599 / RMSE 27.6639 from Ch427's 18.9384 / 27.6464. It was
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therefore rejected and never deployed to the board.
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## Logical 256x256 texture support
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The 240 triangle-list draws all share the same captured state and texture.
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The fixture generator now preserves TEX0 logical TW/TH=8 while padding the
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256x256 PSMT8 source row-by-row into the existing physical 512-texel LPDDR
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cache stride. No RTL or RBF change is required. Fail-closed generation
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checks require every logical row to match the reconstructed GS local memory
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byte-for-byte and require the entire unused right/lower cache padding to be
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zero. The emitted descriptor was independently decoded as TBP=1024, TBW=8,
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PSMT8, TW=8, TH=8; its texture CRC is `0x68e8cb9d`.
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The independent software-reference path was also corrected to use logical
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dimensions for UV wrap/clamp and sampling while retaining the physical
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512-texel cache stride.
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## Accepted f33 result
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`zsrt139f33` preserves chronology by inserting the three capacity-packed
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triangle-list epochs between Ch424 scene rows 122 and 123, before the final
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two opaque scene epochs, CT32 darken, and complete alpha family. The result
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has 277 epochs.
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Production RTL replay passed with:
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- 1,326,469 fragments fed and 1,306,834 passed;
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- 277 markers and drains;
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- zero fragment drops, color overflows, and AXI errors;
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- Z mismatch 0/307,200 and color mismatch 0/245,423;
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- framebuffer SHA-256
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`c4e26d4f93d9b30f98b0abe0d99ccb4be8d362401b49f07ef76ca85c316b84de`.
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Relative to Ch427, the recovered character family changes 249 pixels within
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`(323,240)..(360,280)`. The mapped PCSX2 score improves narrowly but in both
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metrics, to MAE 18.9378 / RMSE 27.6458. This is accepted as authentic local
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detail, not claimed as a broad visual milestone.
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## Silicon acceptance
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The timing-clean Ch423 RBF remained loaded. The DE25 completed all 277
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epochs with every texture CRC, palette checksum, staged-record count, ordered
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drain, and zero-drop gate passing; the host returned `rc=0` and selected the
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HDMI line-buffer source. The board dump reports 212,225 nonzero pixels,
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bounds `(0,0)..(511,479)`, sum32 `0x9c95eca0`, and xor32 `0x6e5a9090`.
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Board and production RTL framebuffer files are byte-identical at the SHA-256
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above. The accepted board image is preserved as
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`captures/gs/silenthill3/extracted/sh3_zsrt139f33_ch428_board.png`.
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Ch428 is accepted on silicon and f33 is the current live HDMI baseline.
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