forked from unom/punktfunk
enricobuehler
d6818263ce
gamescope's built-in PipeWire node has always been SDR-only: it offers BGRx and NV12, and `paint_pipewire()` hardcodes a Gamma-2.2 composite with the SDR screenshot LUT set. So an HDR game reaches punktfunk already tone-mapped down, and the whole gamescope backend streams 8-bit no matter what the client can decode. Games CAN render HDR on a headless gamescope today — only the capture half is missing. Carry the two patches that close it (packaging/gamescope/patches): the node additionally offers `xRGB_210LE`/`xBGR_210LE` with MANDATORY SMPTE ST.2084 + BT.2020 props, mapped to the same 10-bit capture texture the HDR AVIF screenshot path already allocates, and `paint_pipewire()` composites into them with the HDR screenshot LUTs + `EOTF_PQ` — which is exactly the in-tree `bHDRScreenshot` branch. The new formats are listed LAST, so every existing consumer keeps negotiating the 8-bit stream bit-for-bit. Offered upstream against ValveSoftware/gamescope#2126. Ship it as `punktfunk-gamescope`, beside the distro's own binary rather than replacing it: a Bazzite sysext payload (`build-sysext.sh --gamescope`, which refuses a binary without the marker), an Arch package, a nix derivation + `services.punktfunk.host.gamescopeHdr`, and one distro-agnostic build script the rest call. The second patch stamps `+pfhdr1` into the `--version` banner. That is not cosmetic: punktfunk fixes a session's bit depth in the Welcome, before the display exists and with no way to take it back, so its capability answer has to be a static property of the binary it will spawn.
56 lines
3.4 KiB
Bash
56 lines
3.4 KiB
Bash
# punktfunk host config for Bazzite (~/.config/punktfunk/host.env).
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#
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# The compositor + input backend are AUTO-DETECTED per connect from the ACTIVE session: the host
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# follows the box as you flip between Steam Gaming Mode (gamescope — a managed session at the
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# CLIENT's resolution) and a KDE/GNOME Desktop (KWin/Mutter virtual output at the client's mode).
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# So nothing here forces a backend, and no session anchors are needed: a `systemctl --user`
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# service inherits the correct XDG_RUNTIME_DIR and the host derives the bus from it. (Keys are
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# CASE-SENSITIVE — use the exact uppercase names.)
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PUNKTFUNK_VIDEO_SOURCE=virtual
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# GPU zero-copy capture (dmabuf -> CUDA -> NVENC) is ON by default and auto-falls back to CPU if
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# unavailable. No need to set it. Set to 0 only to force the CPU path.
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# PUNKTFUNK_ZEROCOPY=0
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#RUST_LOG=info
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# --- Optional overrides (default is active-session auto-detection) ---
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# Force a specific backend for testing (skips auto-detect + env retargeting):
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# PUNKTFUNK_COMPOSITOR=kwin|mutter|wlroots|gamescope
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# PUNKTFUNK_INPUT_BACKEND=libei|wlr|gamescope|uinput
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#
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# GAME MODE = ATTACH (the box owns its session; the host follows). The box decides whether it's in
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# Steam Gaming Mode or a Desktop — you switch with the normal Steam UI / "Switch to Desktop". The
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# host just ATTACHES to whatever's live and captures it; it never tears the session down. So
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# switching Desktop<->Game is rock-solid, and when you disconnect the box STAYS in its current
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# mode — reconnecting drops you right back where you were. On a resolution mismatch the host
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# restarts the box's own game-mode session at the CLIENT's resolution (a foreign/bare gamescope
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# instead streams at its own mode).
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PUNKTFUNK_GAMESCOPE_ATTACH=1
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#
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# Opt OUT to the MANAGED model instead (host tears the box's gamescope down on connect and launches
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# its OWN at the CLIENT's exact resolution; restores on a debounced idle). Client-mode-following, but
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# it does not coexist with a box-owned game-mode session — pick one:
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# PUNKTFUNK_GAMESCOPE_MANAGED=1 # (and remove PUNKTFUNK_GAMESCOPE_ATTACH above)
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#
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# Follow a Gaming<->Desktop switch MID-STREAM (rebuild the backend in place, no reconnect). This is
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# ON BY DEFAULT on Bazzite/SteamOS (the host detects the platform); set =0 to disable it:
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# PUNKTFUNK_SESSION_WATCH=0
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#
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# HDR (10-bit BT.2020 PQ) on the gamescope path. Needs `punktfunk-gamescope` — gamescope plus the
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# patch that teaches its capture node the 10-bit formats — which the sysext ships alongside the
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# host; it does NOT replace the system gamescope. Off by default while the feature soaks; a host
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# without the patched binary stays SDR either way. `punktfunk-host hdr-probe` says what it found.
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# PUNKTFUNK_GAMESCOPE_HDR=1
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#
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# On an HDR session, how bright SDR content (desktop, Steam overlay, SDR games) is inside the PQ
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# container. gamescope's default is 400 nits; raise it if whites look dim on your TV.
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# PUNKTFUNK_GAMESCOPE_SDR_NITS=400
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#
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# HEADLESS GAME MODE: on a box with no display attached, Bazzite's "Switch to Game Mode" normally
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# crashes (gamescope's DRM backend has no panel to drive). The host package ships
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# /etc/gamescope-session-plus/sessions.d/steam, which auto-falls-back to gamescope's HEADLESS backend
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# when no display is connected — so game mode boots offscreen and streams, with no config here. It's a
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# no-op on display-attached boxes. (The host then auto-detects Gaming and streams it.)
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