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enricobuehlerandClaude Fable 5 5e1e64e50b perf(latency): T2.5b — NV12 compute CSC on the LINEAR/gamescope zero-copy path

design/latency-reduction-2026-07.md T2.5's Linux half: the LINEAR dmabuf path
(gamescope's only offer) fed NVENC RGB, paying its internal RGB->YUV CSC on
the SM the game is saturating — the exact contention §5.A removed everywhere
else. The Vulkan bridge now carries a buffer-to-buffer RGB->NV12 compute
shader (rgb2nv12_buf.comp, BT.709 limited, coefficient-identical to
pf-encode's rgb2yuv.comp; whole-word writes so no 8-bit-storage feature is
needed): import dmabuf -> dispatch CSC into the exportable buffer -> CUDA
de-strides both planes into a pooled two-plane NV12 buffer. PUNKTFUNK_NV12
(default-on) now covers LINEAR; a CSC failure latches RGB for the stream
(mid-frame fallback, no dropped frame); 4:4:4 LINEAR sessions stay RGB (never
silently subsample). New ImportKind::LinearNv12 rides the existing worker IPC
(appended last per the wire-tag rule); cursor stays downstream (blend_nv12).

Validated: .21 clippy -D warnings (pf-zerocopy/pf-capture/host+nvenc) + 17
zero-copy tests. Owed: on-glass gamescope session (visual + dmon sm% check).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

2026-07-17 20:14:20 +02:00

libvpl-sys

chore(libvpl-sys): silence clippy across the generated bindings

2026-07-17 19:48:17 +02:00

pf-capture

perf(latency): T2.5b — NV12 compute CSC on the LINEAR/gamescope zero-copy path

2026-07-17 20:14:20 +02:00

pf-client-core

perf(latency): tier-0 attribution + tier-1 send-path levers from the latency plan

2026-07-17 19:13:08 +02:00

pf-clipboard

Merge commit '0c9d3ee3' into HEAD