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feat(gamestream): pen P2 — SS_PEN/SS_TOUCH ingest, featureFlags advertised on capable hosts

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The Moonlight leg of design/pen-tablet-input.md §4: DESCRIBE now advertises
SS_FF_PEN_TOUCH_EVENTS wherever pen injection exists (Linux+uinput, same gate
as HOST_CAP_PEN — elsewhere the flag stays 0 and Moonlight keeps client-side
mouse emulation exactly as today). SS_PEN packets merge over last-known state
into state-full PenSamples (BUTTON_ONLY per spec carries no position; unknown
contact pressure 0.0 inks at full scale; UP keeps proximity only for clients
that demonstrated hover) and drive the same PenTracker→VirtualPen chain as the
native plane — Moonlight iOS + Apple Pencil now exercises the full injection
path end to end. SS_TOUCH forwards as wire touch on a synthetic 65535² surface
with CANCEL_ALL replayed per tracked contact. No stroke timeout on this plane:
ENet is ordered/reliable and Moonlight doesn't heartbeat a stationary pen.
Packet layouts pinned against moonlight-common-c Input.h/Limelight.h upstream.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
enricobuehler
2026-07-23 16:18:31 +02:00
co-authored by Claude Fable 5
parent aca5aa9993
commit b192825869
5 changed files with 537 additions and 2 deletions
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crates/punktfunk-host/src/gamestream/rtsp.rs
+15 -1
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@@ -309,12 +309,26 @@ fn handle_request(req: &Request, state: &AppState, peer: Option<SocketAddr>) ->
}
}
/// moonlight-common-c `LI_FF_PEN_TOUCH_EVENTS`: with this featureFlags bit set, Moonlight
/// clients send native `SS_PEN`/`SS_TOUCH` events (an iPad's Apple Pencil included) instead
/// of synthesizing mouse input client-side.
const SS_FF_PEN_TOUCH_EVENTS: u32 = 0x01;
/// Host capability SDP returned by DESCRIBE. Advertises HEVC + AV1 and no encryption
/// (plaintext streams for now; P1.5 adds the negotiated AES paths).
fn describe_sdp() -> String {
// Pen/touch events are advertised only where we can actually inject them (Linux with
// uinput — the same gate as HOST_CAP_PEN; design/pen-tablet-input.md §4). Elsewhere the
// flag stays 0 so Moonlight keeps its client-side mouse emulation for touch, exactly as
// today. PUNKTFUNK_PEN=0 clears it (the operator kill-switch inside pen_supported).
let feature_flags: u32 = if crate::inject::pen_supported() {
SS_FF_PEN_TOUCH_EVENTS
} else {
0
};
// Line-oriented a=key:value, matching what moonlight-common-c scans for.
let mut lines: Vec<String> = vec![
"a=x-ss-general.featureFlags:0".into(),
format!("a=x-ss-general.featureFlags:{feature_flags}"),
"a=x-ss-general.encryptionSupported:0".into(),
"a=x-ss-general.encryptionRequested:0".into(),
"sprop-parameter-sets=AAAAAU".into(), // HEVC capability indicator