forked from unom/punktfunk
enricobuehler
5c6b09a5c5
M3 was recorded as code complete. Its exit criteria named the HEVC gpu_smoke and gpu_parity legs, and the goldens for them were committed — 250 per-frame NV12 hashes, cross-checked between two independent FFmpeg builds, with a header saying they are "consumed the same way by the HEVC parity test". No such test existed. Both GPU files were H.264 only, with zero references to h265, so nothing had ever decoded a single HEVC frame through this crate on hardware. They exist now, and the first run answered. On AMD Adrenalin 25.10.30.02 (distinct mode, queryResultStatusSupport=false) 247 of 250 frames diverge from libavcodec, and that device's smoke leg PASSES — because smoke only reads the driver's verdict and that driver reports none. That is the Ally X class, reproduced in-house on demand: output that is wrong everywhere the picture is looked at and clean everywhere the decoder is asked. Both NVIDIA drivers reject the stream outright and name the cause themselves, "Invalid PPS/SPS id in slice header (pps_id=119 / 115)" — the identical two values, and the smoke leg dies at the identical AU 9, on a 4090 under 610.88 on Windows and on an RTX 5070 Ti under 610.43.03 on Linux. Same wrong values, same access unit, two GPU generations, two operating systems: deterministic, and therefore ours rather than any driver's. It is not an ordering fault. Five of the divergent hashes appear nowhere in the 250 goldens, so the pixels are wrong rather than correct-but-reordered. Parity dies at frame 1 while smoke dies at AU 9 only because smoke holds four frames before it looks; the first inter-predicted picture is already corrupt. The legs are committed ahead of the fix deliberately. They are the regression test for the defect, they are #[ignore]d so no CI leg changes colour, and the evidence above is worth recording in the order it was obtained. Adding a third and fourth copy of ~150 lines of unsafe Vulkan bring-up was not acceptable, so it moved to tests/common. The two behavioural differences between the callers are now named parameters rather than accidents: the parity legs read back on a graphics queue and require one, while the smoke legs accept a decode-only device and fall back to the decode family — which also decides whether pool images are EXCLUSIVE or CONCURRENT, so it is load-bearing rather than cosmetic. H.264 came through the refactor unchanged, verified two ways: argument-by-argument against the previous file, and on hardware, still 250/250 bit-identical on NVIDIA Windows, AMD Windows and now NVIDIA Linux. The loader is deliberately leaked at teardown. ash::Entry owns the Arc<Library>, so dropping it unloads the Vulkan loader with every ICD and implicit layer; harmless while each binary held one GPU leg, but each now holds two, and the second would re-open a loader the first had torn down. Three guards run without a GPU, because everything above is #[ignore]d: the golden file's count and digest shape, the HEVC access-unit split agreeing with what the CPU planner emits (with iraps == 1 pinning "no CRA anywhere", so a re-synced vector that opens with one fails here rather than as a frame-count mismatch on the fleet), the vector staying Main 4:2:0 8-bit since both legs hard-code that probe, and a refusal to run the smoke legs with PF_VKD_TEST_READBACK set, which would quietly grow the pool a usage flag production never carries.