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enricobuehler 4543a3f529 feat(video): HDR10/P010 end to end (phase 6)

The client now advertises VIDEO_CAP_10BIT|HDR and carries the result all
the way to glass:

- csc_rows is bit-depth exact (10-bit limited code points differ from
  8-bit by ~half a code) and folds in the P010/X6 MSB-packing factor;
  new 10-bit white/black tests.
- The CSC shader grows a params block: mode 0 passes the transfer
  through (SDR as-is, or PQ onto an HDR10 swapchain); mode 1 tonemaps
  PQ→SDR in-shader (ST.2084 EOTF, 203-nit reference white exposure,
  BT.2020→709, soft maxRGB rolloff, sRGB encode) for desktops without
  an HDR surface. PUNKTFUNK_TONEMAP_PEAK tunes the rolloff.
- The presenter probes VK_EXT_swapchain_colorspace + an HDR10/ST.2084
  10-bit surface format and flips modes in-band with the stream's PQ
  signaling: fence-quiesce, then CSC pass + video image (10-bit
  A2B10G10R10 intermediate — PQ in 8 bits bands) + overlay pipe +
  swapchain rebuild through the deferred-destroy rules.
- P010 decodes through all three paths: Vulkan Video (X6 multiplanar
  pool, R10X6 plane views), VAAPI dmabuf (R16/RG1616 plane imports),
  software (swscale as before).
- session pump advertises the caps; the host still gates Main10 behind
  its PUNKTFUNK_10BIT policy.

Probed on glass hardware: the KDE/NVIDIA surface exposes
A2B10G10R10+HDR10_ST2084, so true PQ passthrough is available there.
Known v1 gaps: software-decode PQ shows untonemapped (8-bit RGBA
carries the transfer baked); the SDR overlay composites unscaled onto
an HDR10 surface (dim OSD); no vkSetHdrMetadataEXT yet.

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

2026-07-07 23:14:08 +02:00

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punktfunk-session

The Vulkan session binary: one stream per invocation in an SDL3 window — no UI toolkit, no widgets, terminal stats. The power-user / gamescope stream client, and the stage-2 presenter of the Linux client re-architecture (punktfunk-planning: linux-client-rearchitecture.md).

punktfunk-session --connect host[:port] [--fp HEX] [--launch id] [--fullscreen] [--stats]
punktfunk-session --browse host[:port] [--mgmt PORT] [--fullscreen]

--browse opens the console game library (the Skia coverflow over the animated aurora) instead of connecting: A launches the focused title as a stream in the same window, session end returns to the library, B quits (Gaming Mode returns). Paired hosts only — pairing is the desktop client / Decky plugin's job. PUNKTFUNK_FAKE_LIBRARY=<file.json> feeds canned entries with no host (portrait paths starting with / load from disk).

Reads the same identity / known-hosts / settings stores as the desktop client (punktfunk-client) — pair there (or via its headless --pair) first; this binary never connects to a host it has no pinned fingerprint for (--fp HEX overrides the store).

Stdout is the machine interface: {"ready":true} after the first presented frame, stats: … once per second (Ctrl+Alt+Shift+S toggles, --stats forces on), one {"error"|"ended": …} JSON line on the way out. Logs go to stderr. Exit codes: 0 clean end, 2 connect failed, 3 trust rejected / pairing required, 4 presenter init failed.

In-stream keys match the desktop client: click captures input (Ctrl+Alt+Shift+Q releases), Ctrl+Alt+Shift+D disconnects, F11 toggles fullscreen; the controller escape chord (L1+R1+Start+Select, hold to disconnect) works the same.

The default build carries the Skia console UI (ui feature): the stats OSD and capture hint render in-window (Ctrl+Alt+Shift+S toggles both the OSD and the stdout mirror). --no-default-features is the ~5 MB power-user build — same streaming, stats on stdout only, no Skia anywhere in the dependency tree.

Decode follows the Settings preference (auto: Vulkan Video → VAAPI → software): FFmpeg's Vulkan Video decoder runs on the presenter's own device where the stack supports it (every vendor, zero copy); VAAPI dmabufs import per-plane elsewhere; software is the universal fallback. 10-bit Main10 and HDR10 are advertised (VIDEO_CAP_10BIT|HDR): P010 decodes through all three paths, and PQ streams present on an HDR10/ST.2084 swapchain when the desktop offers one (KDE HDR, gamescope) or tone-map in-shader to SDR when it doesn't (PUNKTFUNK_TONEMAP_PEAK tunes the rolloff, default ≈1000 nits). The host still gates the upgrade behind its PUNKTFUNK_10BIT policy.

Debug/bisect knobs: PUNKTFUNK_DECODER=vulkan|vaapi|software, PUNKTFUNK_PRESENT_MODE= mailbox|immediate (default FIFO), PUNKTFUNK_VK_DEVICE=<index> (multi-GPU), and PUNKTFUNK_HW_FAULT=import (fault every VAAPI dmabuf import — proves the three-strike demotion to software on healthy hardware).

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punktfunk-session

3.0 KiB

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