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PyroWave's wavelet encode runs on the GPU's compute/shader cores, so a GPU-bound game starves it: submit spikes from ~2 ms to ~15 ms under a 95%+ game load and the stream fps collapses. NVENC is immune (separate encoder ASIC). Two levers to let the encode get scheduled ahead of the game's rendering: - Windows process GPU scheduling: D3DKMTSetProcessSchedulingPriorityClass, env PUNKTFUNK_GPU_PRIORITY = off|above-normal|high (default)|realtime. Best-effort, once per process, non-fatal on refusal (enc/windows/pyrowave.rs). - Global-priority Vulkan encode queue (Granite patch 0005): request a VK_KHR_global_priority queue (PYROWAVE_QUEUE_PRIORITY = off|high|realtime, default realtime), downgrading REALTIME→HIGH→none on NOT_PERMITTED so a refused class never regresses the encoder to HEVC. HONEST STATUS: on an RTX 4090 / Windows / WDDM neither moved the ~15 ms spikes — the graphics-vs-compute preemption granularity is the wall, not the priority level. Kept because both are correct, harmless (graceful fallback), and may help other GPUs/drivers. For a GPU-saturated game the working levers are reducing the encode's GPU cost (4:2:0/8-bit) or H.265; PyroWave holds full rate on the desktop and in games that leave the GPU headroom. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Vendored by scripts/vendor-pyrowave.sh — do not edit by hand.
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pyrowave: 509e4f887b585a3f97471fcc804e9de649f2c16f
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Granite: 44362775d36e0c4139352f83efd96bab4e239f66
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volk: 47cddf7ed97b94118a08aacb548a411188e016cc
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vulkan-headers: 015e25c3c91b70eb1a754d36fb14c4ba6ad9b0b9
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Tree is pruned to what the pyrowave-sys standalone build needs
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(see the rm -rf list in the script). All parts are MIT-licensed
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(pyrowave, Granite) or Apache-2.0/MIT (volk, Vulkan-Headers).
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Local patches (crates/pyrowave-sys/patches/, re-applied on re-vendor):
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0001-payload-data-444-sizing.patch — encoder payload_data worst-case buffer
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was sized for 4:2:0's 1.5 samples/px; busy 4:4:4 (3 samples/px) overran it
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on the GPU → nondeterministic corrupt bitstreams/crashes at any bitrate.
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Found + validated 2026-07-18 (RTX 5070 Ti, 1080p/4K, 8/16-bit); to be
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reported upstream.
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(0002-0003 are reserved by concurrent in-flight work and land separately.)
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0004-encoder-buffer-pool.patch — pyrowave_c.cpp allocated four Vulkan buffers
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(meta + bitstream, Device + CachedHost) on EVERY encode. At 240 fps with
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MB-scale bitstreams that per-frame churn stalled the encode itself: on an
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RTX 4090 the 5120x1440 submit+fence-wait was ~15 ms (~64 fps ceiling) and
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dropped to ~1 ms (~1025 fps) once the buffers are pooled on the encoder and
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reused. Safe under the synchronous encode model; re-validated by
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pyrowave_win_smoke. Perf fix, not a correctness fix.
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0005-global-priority-queue.patch — Context::create_device requests a global-priority Vulkan
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compute queue (VK_KHR_global_priority, PYROWAVE_QUEUE_PRIORITY=off|high|realtime, default
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realtime) so the wavelet encode can preempt a GPU-bound game on the shared shader cores. A
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create loop downgrades on NOT_PERMITTED so a refused class never regresses the encoder. Did
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not overcome the graphics-vs-compute preemption wall on an RTX 4090 (kept: correct + harmless,
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may help other HW/drivers).
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