89b5c39d8a
Two readback-proven root-cause fixes make the publisher-logo QuadList draw land its REAL captured vertex buffer (the texture was already correct from 3V). REFUTES iterate-3W's "logo geometry is auto-generated from vertex_id": the logo IS sourced from a 4-vertex QuadList buffer at guest physical 0x0adf60f0 (measured), it was just resolved at the wrong fetch-constant register. GPUBUG-110 (vertex fetch const_index_sel dropped). The Xenos vertex-fetch instruction encodes const_index (w0[20:24]) AND const_index_sel (w0[25:26]); the full constant index is const_index*3 + const_index_sel (canary ucode.h:700), packed 3 two-dword constants per 6-dword register group. ucode/fetch.rs decoded only const_index and read sub-slot 0 (fc*6). The logo vfetch is const_index=31, sel=2 -> the real base lives at reg 0x48BE, but ours read 0x48BA which held an unused 0x00000001 (base=0,size=0) slot. So resolve_vertex_window returned None -> has_real_vertices=false -> the logo fell to the procedural fullscreen magenta fallback. Fix: decode const_index_sel, add VertexFetch::const_reg_offset() = const_index*6 + sel*2, and use it in both draw_capture.rs (capture) and translator.rs (the WGSL endian term + no-window fallback base; the old expression there read the src_reg bits, not the const index). Measured: logo now resolves a 24-dword (4 verts x stride 6) window, base 0x0adf60f0. GPUBUG-111 (single batch encoder = last-draw-wins vertex data). In wgpu every queue.write_buffer staged before a single queue.submit is applied before ANY command in that submit runs. dispatch_xenos_captures recorded the whole batch into one encoder + one submit, so every draw read only the LAST draw's vertex buffer / per-draw uniforms. The logo quad therefore sampled the trailing fullscreen background quad's vertices and rasterized nothing where the logo was. Fix: submit one encoder per draw (frontbuffer LoadOp::Load composites identically). Measured (env-gated readback, removed): with this fix the logo draw in isolation renders real varied texels (e.g. (225,17,22)/(255,255,0)) in a centered strip (~20k px), vs 100% navy before. Determinism: all changes are UI-side (xenia-ui replay) or the UI translator / capture path (frame_captures None in headless); the fetch.rs field addition is purely additive and does not change any existing decoded value. Verified the deterministic core unchanged: check -n50M --gpu-inline --stable-digest exit 0 and all 136 metric counters byte-identical across two runs. All temp probes removed. cargo test --workspace green; new regression test vertex_fetch_const_index_sel_and_reg_offset. Known remaining (next iterate): a fullscreen flat QuadList (ps 0x03b79081, vertex color green, no texture) and other textureless draws overpaint the logo in the full composite (their per-draw blend/alpha render state is not yet replayed, and draw order alternates bg/logo). The logo artwork renders correctly in isolation; the composite is not yet clean. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>