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punktfunk/crates
enricobuehler b1e95a386f
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fix(host/windows): tiered DXGI recovery — cheap re-DuplicateOutput for the HDR ACCESS_LOST churn
The HDR path produced a constant ACCESS_LOST churn during real desktop activity (window resize /
Start menu / DWM transitions): the duplication keeps getting invalidated but the OUTPUT stays valid
(probe passes — 0 born-lost over 72 rebuilds). The old recovery did a FULL rebuild (new device +
factory) on every loss, which re-inits NVENC + seeds black + was throttled to 4x/s → mostly-frozen,
re-init churn = "broken animations".

Now recovery is tiered (mirrors Sunshine): try_reduplicate() does a fresh DuplicateOutput on the
EXISTING device+output — no new device, so NO encoder re-init, NO black seed, gpu_copy/HDR
textures/last_present kept → frames resume immediately. Only a genuine output loss (secure-desktop
switch) or a dead device (DEVICE_REMOVED/RESET) falls back to the full, throttled recreate_dupl.
Both paths probe the new duplication and reject a born-lost one.

Validated synthetically (1080p60 + 5120x1440@240 HDR): pipeline stable, 0 churn, frames flow. The
real-desktop churn needs live validation (can't synthesize DWM animations). Secure-desktop "UI never
appears in-session" is a separate issue (output gone in-session; only a fresh monitor re-add works) —
still open.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-15 21:31:14 +00:00
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