Adds true HDR (BT.2020 PQ) and 10-bit (HEVC Main10) streaming, negotiated so an
8-bit/SDR client is never sent a stream it can't decode, plus a robust fix for the
capture losing the stream across a secure-desktop transition.
Protocol (punktfunk-core/quic.rs):
- Hello gains `video_caps` (VIDEO_CAP_10BIT / VIDEO_CAP_HDR), Welcome gains `bit_depth`,
both as optional trailing bytes (back-compat). client-rs advertises 10-bit via
PUNKTFUNK_CLIENT_10BIT; the connector advertises 0 for now (in-band detection drives
the native clients). Regenerated punktfunk_core.h.
Windows host:
- 10-bit Main10: host enables it only when the client advertised VIDEO_CAP_10BIT AND
PUNKTFUNK_10BIT is set; threaded through open_video → NVENC (profile Main10,
pixelBitDepthMinus8).
- HDR: when the captured desktop is scRGB FP16 (R16G16B16A16_FLOAT, HDR on), copy it to
an FP16 surface, composite the cursor there, convert scRGB → BT.2020 PQ 10-bit
(R10G10B10A2) via a shader, and encode HEVC Main10 with the BT.2020/PQ colour VUI
(ABGR10 input). Fixes the freeze + cursor-trail that came from feeding FP16 into the
BGRA path. Reacts dynamically to the HDR toggle.
- Capture recovery: rebuild is now a single NON-BLOCKING attempt, throttled to ~4×/s,
repeating the last good frame between attempts (format-tagged last_present). During a
secure-desktop dwell SudoVDA's output is gone; the old blocking 12 s retry starved the
send loop for seconds so the client timed out and disconnected — now the session stays
fed (frozen) until the desktop returns. Also seeds a black frame on recovery.
Apple client (PunktfunkKit):
- Detects HDR in-band from the stream VUI (PQ transfer function), decodes to 10-bit P010,
and presents via an rgba16Float + BT.2020 PQ CAMetalLayer with EDR; SDR path unchanged.
Switches automatically on a mid-session HDR toggle.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
enricobuehler
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