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

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>
2026-07-06 10:33:30 +00:00
parent a947f48d29
commit 2f9e61d191
11 changed files with 33 additions and 27 deletions
@@ -8,7 +8,7 @@ WAYLAND_DISPLAY=wayland-kde
 XDG_CURRENT_DESKTOP=KDE
 PUNKTFUNK_COMPOSITOR=kwin
 PUNKTFUNK_VIDEO_SOURCE=virtual
-PUNKTFUNK_ZEROCOPY=1
+# GPU zero-copy (dmabuf → CUDA → NVENC) is ON by default; auto-falls back to CPU. Set =0 to force CPU.
 PUNKTFUNK_INPUT_BACKEND=libei
 # UDP Generic Segmentation Offload on the send path: coalesce a frame's equal-size packets into
 # kernel super-buffers (one sendmsg per ~64 packets instead of one per packet) — the dominant