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feat(host): enable GPU zero-copy by default on all backends

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Now that the per-capture worker subprocess makes an NVENC EGL/CUDA driver
fault survivable (design/zerocopy-worker-isolation.md), the reason the NVENC
zero-copy path stayed opt-in is gone. zerocopy::enabled() now defaults ON for
both GPU backends (was ON VAAPI / OFF NVENC). Fallbacks are intact: VAAPI's
one-shot CPU auto-downgrade (VAAPI-gated, never trips for NVENC) and NVENC's
per-capture fallback + worker-death latch.

Reframe the shipped host.env examples and setup guides to rely on the default
rather than force PUNKTFUNK_ZEROCOPY=1 (an explicit =1 skips the VAAPI
auto-downgrade).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Enrico Bühler
2026-07-06 10:33:30 +00:00
parent 7257bcb6a6
commit 9814368c8c
11 changed files with 33 additions and 27 deletions
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scripts/host.env.example
+3 -2
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@@ -16,8 +16,9 @@ XDG_CURRENT_DESKTOP=KDE
# resolution+refresh (the flagship mode); `portal` captures an existing monitor.
PUNKTFUNK_VIDEO_SOURCE=virtual
# GPU zero-copy capture (EGL/Vulkan → CUDA → NVENC). Falls back to CPU automatically.
PUNKTFUNK_ZEROCOPY=1
# GPU zero-copy capture (dmabuf → CUDA → NVENC / VAAPI / Vulkan) is ON by default and falls back to
# CPU automatically. No need to set it. Set to 0 only to force the CPU path.
# PUNKTFUNK_ZEROCOPY=0
# --- Bazzite / SteamOS-like host: host-managed Steam-Deck-UI session -----------------------
# The host LAUNCHES gamescope-session-plus headless AT THE CLIENT'S mode (so games see the