HDR (display-driven, matching the WGC path):
- CTA-861.3 HDR EDID (BT.2020 primaries + HDR Static Metadata block) so Windows
offers "Use HDR" on the virtual display. The host FOLLOWS the display's live
advanced-color state, recreating the shared ring at the matching format
(FP16 in HDR / BGRA in SDR) on a toggle — no freeze.
- Always emit Main10/BT.2020-PQ Rgb10a2 while the display is HDR; the client
auto-detects PQ from the HEVC VUI (clients under-report VIDEO_CAP_10BIT).
Generic HDR10 mastering SEI on every IDR.
- Generation-tagged `latest` (gen<<40|seq<<8|slot) + driver `is_stale` re-attach
kill the toggle-time garbage frame and any stale-ring read.
Perf:
- Pipeline the encode loop (Capturer::pipeline_depth; IDD-push = 2): submit N+1
before polling N so the convert/copy on the 3D engine overlaps the NVENC encode
of N on the ASIC. PUNKTFUNK_IDD_DEPTH overrides (1 = synchronous).
- Rotating host output ring (OUT_RING) so the in-flight encode and the next
convert never touch the same texture.
- HDR converts directly from the keyed-mutex slot's SRV into the output ring
(drops the redundant slot->fp16 scratch copy); SDR copies the BGRA slot in.
The slot mutex is held only across the convert/copy, not the encode.
RING_LEN 3->6 for publish headroom.
- Capture-health diagnostic: new_fps vs repeat_fps under PUNKTFUNK_PERF (a low
new_fps at a high send rate means the source isn't compositing, not an encode
stall).
Validated live on the RTX box: 5120x1440@240 HDR streams; driver composes
~180 new fps, encode 240 fps @ ~4.3 ms p50.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
enricobuehler
c7ef0e411a