enricobuehlerandClaude Fable 5
0323158a3e
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A freshly spawned headless gamescope never delivered a single PipeWire buffer when a game was launched: gamescope only composites (and only on a composite pushes a capture buffer) when a client paints, and a nested Steam bootstrap paints nothing until its UI's first frame — far longer than the 10 s first-frame budget. The native plane's retry ladder then killed the half-booted Steam on every attempt and started from zero; the GameStream plane died on its single wait. Reused live displays worked, which pointed away from the real cause (root-caused on .41 with a raw pw_stream probe: `sleep infinity` nested → 0 buffers ever, `vkcube` nested → 60/s immediately). Every bare spawn now backgrounds the host's own splash client (`gamescope-splash`, hidden subcommand) beside the nested app: a dark window with a subtle breathing bar painted at ~2.5 Hz — damage from the first second, so capture gets its first frame within the budget on both planes. In `--steam` mode gamescope composites only windows whose appid is in the root `GAMESCOPECTRL_BASELAYER_APPID` list (live-proven: even a painting vkcube gets zero composites without it), so the splash declares itself as the Steam UI (STEAM_GAME=769) and seeds the baselayer iff unset; Steam's own rewrite at game launch hands composite focus to the game with no action on our side. PUNKTFUNK_GAMESCOPE_SPLASH=0 is the escape hatch. The dedicated Steam launch is also shaped with `-gamepadui` instead of `-silent`: the nested Steam is Big Picture — the identity gamescope's `--steam` integration is built around — so the boot shows the gamepad UI instead of the desktop client window flashing through the stream, and gamescope's focus rules (game outranks the Steam UI appid) cover what `-silent` was working around. On-glass on .41 (Bazzite, RTX 5070 Ti, gamescope c31743d): cold connect + Balatro launch delivers frames on the first attempt on both a cold and a torn-down-then-fresh spawn; Big Picture boot → game handover confirmed. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
68 lines
3.3 KiB
TOML
68 lines
3.3 KiB
TOML
# Virtual-display orchestration (plan §W6): the on-demand client-sized headless output — per-compositor
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# Linux backends (KWin zkde-screencast, wlroots swaymsg, Mutter RemoteDesktop, Hyprland) and the
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# Windows IddCx/pf-vdisplay driver backend — behind one VirtualDisplay trait, plus the mode-conflict
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# admission registry and the DDC/CI panel control. Extracted into a subsystem crate; depends on the
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# shared leaves (pf-frame's DXGI identity, pf-win-display's CCD helpers, pf-gpu, pf-paths) + pf-encode
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# (the NVENC session-budget admission gate), never on capture/inject or the orchestrator (the display
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# lifecycle events invert to a host-registered sink).
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[package]
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name = "pf-vdisplay"
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version.workspace = true
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edition = "2021"
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rust-version.workspace = true
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license = "MIT OR Apache-2.0"
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description = "punktfunk host virtual-display orchestration: per-compositor Linux backends + the Windows IddCx driver backend behind one VirtualDisplay trait."
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publish = false
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[dependencies]
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punktfunk-core = { path = "../punktfunk-core", features = ["quic"] }
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pf-frame = { path = "../pf-frame" }
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pf-gpu = { path = "../pf-gpu" }
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pf-host-config = { path = "../pf-host-config" }
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pf-paths = { path = "../pf-paths" }
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pf-win-display = { path = "../pf-win-display" }
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# The Windows admission gate consults NVENC's session budget (can_open_another_session).
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pf-encode = { path = "../pf-encode" }
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anyhow = "1"
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tracing = "0.1"
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# The platform-neutral policy/identity/custom-preset state is serde-serialized (persisted + the mgmt
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# API), and the policy/preset types derive utoipa `ToSchema` for the OpenAPI document.
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serde = { version = "1", features = ["derive"] }
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serde_json = "1"
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utoipa = { version = "5", features = ["axum_extras"] }
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sha2 = "0.10"
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hex = "0.4"
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[target.'cfg(target_os = "linux")'.dependencies]
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libc = "0.2"
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# The Mutter backend drives D-Bus RemoteDesktop + ScreenCast.RecordVirtual via ashpd on a tokio
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# runtime; the gamescope restore worker + portal handshakes use tokio too.
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ashpd = { version = "0.13", features = ["screencast", "remote_desktop"] }
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tokio = { version = "1", features = ["rt", "rt-multi-thread", "macros", "net", "time"] }
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futures-util = "0.3"
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# KWin virtual-output creation via the privileged `zkde_screencast_unstable_v1` protocol (vendored in
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# `protocols/`); the generated interface tables reference `wayland-backend`.
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wayland-client = "0.31"
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wayland-scanner = "0.31"
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wayland-backend = "0.3"
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# wayland-scanner emits `bitflags::bitflags!` for the KDE output-device protocol's bitfield enums
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# (kde-output-device-v2 `capability`/`flags`); needs the crate in scope (kwin_output_mgmt.rs).
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bitflags = "2"
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# The gamescope bare-spawn splash client (gamescope/splash.rs): pure-Rust X11 core protocol (the
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# same no-libxcb-link stance as pf-capture's XFixes cursor source), no extension features needed.
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x11rb = { version = "0.13", default-features = false }
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[target.'cfg(target_os = "windows")'.dependencies]
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# The host<->driver wire contract for the pf-vdisplay IddCx backend (control IOCTLs + Pod structs).
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pf-driver-proto = { path = "../pf-driver-proto" }
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bytemuck = { version = "1.19", features = ["derive"] }
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windows = { version = "0.62", features = [
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"Win32_Foundation",
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"Win32_Devices_DeviceAndDriverInstallation",
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"Win32_Devices_Display",
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"Win32_Graphics_Gdi",
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"Win32_Storage_FileSystem",
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"Win32_System_IO",
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"Win32_System_Threading",
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] }
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