feat(clients/windows): port the Vulkan session client to Windows — session-always
The punktfunk-session Vulkan client (clients/linux-session, now clients/session) builds and runs on Windows; the WinUI shell spawns it for every stream. Verified live: 10-bit HEVC via Vulkan Video on both AMD (iGPU) and NVIDIA, 5120x1440 at 130 fps / 8 ms end-to-end on the RTX 4090. - pf-ffvk: Windows bindgen branch (FFMPEG_DIR + PF_FFVK_VULKAN_INCLUDE, no pkg-config); provisioning fetches Vulkan-Headers (pinned v1.4.309). - pf-client-core: builds on Windows — WASAPI audio (audio_wasapi.rs, cfg-swapped via #[path], same surface as the PipeWire twin), VAAPI/dmabuf gated inline (chain = vulkan -> software), trust reads the WinUI shell's %APPDATA% stores (parity tests pin both serialized shapes), Settings gains adapter/hdr_enabled (serde-defaulted; Linux stores unaffected). - pf-presenter: builds on Windows — dmabuf module Linux-gated; SDL keyboard grab while captured (Alt+Tab/Win reach the host); pick_device ranks discrete over integrated (device 0 was the iGPU on hybrid boxes — the silent footgun) and honors PUNKTFUNK_VK_ADAPTER (the Settings GPU pick, exported by the session). - run loop: block in one SDL wait woken by input AND decoded frames (a per- session forwarder pushes a FrameWake user event) instead of a 1 ms poll — measured 111%% -> 5%% of a core (NVIDIA), 86%% -> 3.5%% (AMD), stats unchanged. The pump's decode-fence wait became once-per-window sampling (no per-frame pipeline stall; the stat now shows true backlog). - pf-console-ui: builds on Windows (skia-safe msvc prebuilts); font lookup falls through fontconfig aliases to concrete DirectWrite families (Consolas/Segoe UI) — browse/coverflow works, verified against a live host. - WinUI shell: session-always via new src/spawn.rs (GTK spawn.rs port — CREATE_NO_WINDOW, stdout contract, kill handle); the Stream screen is a status card (chips + stage lines from the child's stats). The legacy in-process D3D11VA path stays behind Settings "Streaming engine" / PUNKTFUNK_BUILTIN_ STREAM=1 as the A/B baseline until Phase 8 deletes it. SessionParams.video_caps makes the HDR toggle real. - clients/linux-session renamed to clients/session (builds for both OSes). - CI/MSIX: both workflows build/test both bins with widened path filters; the MSIX ships punktfunk-session.exe. ARM64 session builds --no-default-features (rust-skia has no aarch64-pc-windows-msvc prebuilts; flip when it does). A/B on this box (5120x1440 HEVC vs home-worker-5): NVIDIA Vulkan 130 fps / 8 ms e2e / 1.6 ms decode — clearly better than the built-in path. The AMD iGPU VCN saturates at ~52 fps where its own D3D11VA does ~70 — Adrenalin Vulkan decode is slower on APU silicon; discrete RDNA validation gates Phase 8. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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//! The shell↔session handoff: streams run in the spawned `punktfunk-session` Vulkan
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//! binary (session-always, mirroring the GTK shell's `clients/linux/src/spawn.rs`). This
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//! module owns the child's lifecycle plumbing — spawned with CREATE_NO_WINDOW (the
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//! session keeps the console subsystem for its stdout contract; without the flag a GUI
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//! parent would pop a console window), its stdout contract parsed into typed
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//! [`SpawnEvent`]s a reader thread hands to the app's navigation closure: spinner until
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//! `{"ready":true}`, banner from the `{"error"|"ended": …}` line, `trust_rejected`
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//! routed to the re-pair PIN ceremony, `stats:` lines to the session status page.
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//!
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//! The legacy in-process D3D11VA presenter remains reachable via the Settings
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//! "Streaming engine" pick or `PUNKTFUNK_BUILTIN_STREAM=1` (`app::use_builtin_stream`) —
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//! the A/B baseline until its deletion.
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use std::io::BufRead as _;
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use std::process::{Child, Command, Stdio};
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use std::sync::{Arc, Mutex};
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/// One parsed event from the session child.
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pub(crate) enum SpawnEvent {
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/// The child presented its first frame (its window is up and streaming).
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Ready,
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/// One `stats:` line, already human-formatted by the session (per 1 s window).
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Stats(String),
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/// The child exited (stdout EOF + reap; a kill lands here too). `error`/`ended`
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/// carry the contract lines seen on the way out, when any (the exit code is logged
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/// by the reader; routing keys off the lines, which say strictly more).
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Exited {
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error: Option<(String, bool)>,
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ended: Option<String>,
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},
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}
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/// Kills the spawned session child (the Disconnect button, request-access Cancel). Safe
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/// to call any time; a child that already exited is a no-op. A FRESH handle is installed
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/// per spawn (`Shared::session`) so a stale handle can never kill a newer session.
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#[derive(Clone, Default)]
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pub(crate) struct SessionChild(Arc<Mutex<Option<Child>>>);
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impl SessionChild {
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pub(crate) fn kill(&self) {
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if let Some(child) = self.0.lock().unwrap().as_mut() {
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let _ = child.kill();
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}
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}
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}
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/// One parsed stdout line of the session contract; `None` for anything unrecognized.
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enum ChildLine {
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Ready,
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Error { msg: String, trust_rejected: bool },
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Ended(String),
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Stats(String),
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}
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fn parse_line(line: &str) -> Option<ChildLine> {
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if let Some(stats) = line.strip_prefix("stats: ") {
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return Some(ChildLine::Stats(stats.to_string()));
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}
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let v: serde_json::Value = serde_json::from_str(line).ok()?;
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if v.get("ready").and_then(|r| r.as_bool()) == Some(true) {
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return Some(ChildLine::Ready);
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}
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if let Some(msg) = v.get("error").and_then(|m| m.as_str()) {
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return Some(ChildLine::Error {
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msg: msg.to_string(),
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trust_rejected: v.get("trust_rejected").and_then(|t| t.as_bool()) == Some(true),
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});
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}
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if let Some(msg) = v.get("ended").and_then(|m| m.as_str()) {
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return Some(ChildLine::Ended(msg.to_string()));
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}
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None
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}
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/// The session binary: installed next to the shell (the MSIX layout and dev
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/// `target\…` runs both land on the sibling), else `PATH`.
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pub(crate) fn session_binary() -> std::path::PathBuf {
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if let Ok(exe) = std::env::current_exe() {
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let sibling = exe.with_file_name("punktfunk-session.exe");
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if sibling.exists() {
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return sibling;
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}
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}
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"punktfunk-session".into()
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}
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/// Spawn the session binary for a connect with `fp_hex` pinned and feed its lifecycle to
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/// `on_event` from a reader thread. The child is parked in `slot` so Disconnect/Cancel
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/// can kill it. `Err` = the spawn itself failed (binary missing?) — surfaced as a
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/// connect error by the caller.
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pub(crate) fn spawn_session(
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addr: &str,
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port: u16,
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fp_hex: &str,
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connect_timeout_secs: u64,
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slot: SessionChild,
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mut on_event: impl FnMut(SpawnEvent) + Send + 'static,
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) -> Result<(), String> {
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use std::os::windows::process::CommandExt as _;
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const CREATE_NO_WINDOW: u32 = 0x0800_0000;
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let mut cmd = Command::new(session_binary());
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cmd.arg("--connect")
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.arg(format!("{addr}:{port}"))
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.arg("--fp")
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.arg(fp_hex)
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.arg("--connect-timeout")
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.arg(connect_timeout_secs.to_string())
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.stdin(Stdio::null())
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.stdout(Stdio::piped())
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.stderr(Stdio::inherit()) // session logs interleave with the shell's (dev runs)
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.creation_flags(CREATE_NO_WINDOW);
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let mut child = cmd
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.spawn()
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.map_err(|e| format!("couldn't start punktfunk-session: {e}"))?;
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tracing::info!(host = %addr, port, "session binary spawned");
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let stdout = child.stdout.take().expect("piped stdout");
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// Park the child where the kill handle (and the reader, for the final reap) reach it.
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*slot.0.lock().unwrap() = Some(child);
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std::thread::Builder::new()
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.name("punktfunk-session-io".into())
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.spawn(move || {
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let mut error: Option<(String, bool)> = None;
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let mut ended: Option<String> = None;
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for line in std::io::BufReader::new(stdout).lines() {
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let Ok(line) = line else { break };
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match parse_line(&line) {
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Some(ChildLine::Ready) => on_event(SpawnEvent::Ready),
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Some(ChildLine::Stats(s)) => on_event(SpawnEvent::Stats(s)),
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Some(ChildLine::Error {
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msg,
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trust_rejected,
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}) => error = Some((msg, trust_rejected)),
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Some(ChildLine::Ended(msg)) => ended = Some(msg),
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None => {}
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}
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}
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// EOF — reap the child (killed-by-Disconnect lands here too; -1 = no code).
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let code = slot
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.0
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.lock()
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.unwrap()
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.take()
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.and_then(|mut c| c.wait().ok())
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.and_then(|s| s.code())
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.unwrap_or(-1);
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tracing::info!(code, "session binary exited");
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on_event(SpawnEvent::Exited { error, ended });
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})
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.map_err(|e| format!("session reader thread: {e}"))?;
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Ok(())
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn parses_the_stdout_contract() {
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assert!(matches!(
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parse_line("{\"ready\":true}"),
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Some(ChildLine::Ready)
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));
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match parse_line("{\"error\":\"no route\",\"trust_rejected\":false}") {
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Some(ChildLine::Error {
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msg,
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trust_rejected,
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}) => {
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assert_eq!(msg, "no route");
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assert!(!trust_rejected);
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}
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_ => panic!("error line"),
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}
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match parse_line("{\"error\":\"pin\",\"trust_rejected\":true}") {
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Some(ChildLine::Error { trust_rejected, .. }) => assert!(trust_rejected),
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_ => panic!("trust line"),
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}
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match parse_line("{\"ended\":\"Host ended the session\"}") {
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Some(ChildLine::Ended(m)) => assert_eq!(m, "Host ended the session"),
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_ => panic!("ended line"),
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}
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// Stats lines become Stats events; stray output never becomes an event.
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match parse_line("stats: 1280\u{00D7}800@60 \u{00B7} 60 fps") {
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Some(ChildLine::Stats(s)) => assert!(s.starts_with("1280")),
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_ => panic!("stats line"),
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}
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assert!(parse_line("").is_none());
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assert!(parse_line("{\"other\":1}").is_none());
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}
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}
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