Structured per-machine table with repro commands so the pending Intel Mac
and Windows iGPU runs can be appended and compared one-to-one.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Standalone macOS spike for the frame-copy unification direction from the
2026-07-10 analysis: a helper process renders mpv offscreen into a GL FBO,
reads frames back through an async PBO ring, and publishes BGRA frames into
a 3-slot POSIX shm seqlock ring; a minimal Electron viewer copies the newest
frame via a plain-C N-API addon and uploads it to a WebGL canvas per rAF.
First numbers on M1 Pro (see spike README): 4K60 HEVC hwdec sustained at
60 fps end to end, ~1.2 ms shm copy + ~3.5 ms texture upload, ~10 ms
produce-to-upload age, zero torn frames. Remaining gates: weak hardware,
long-run pacing, HDR, latency flash test.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
