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debug(touch): env-gated PUNKTFUNK_TOUCH_DEBUG finger/mouse logging

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Logs every raw SDL Finger{Down,Motion,Up} (with the is_direct_touch
result) and MouseMotion/MouseButton event when PUNKTFUNK_TOUCH_DEBUG=1,
to diagnose why touchscreen input is dropped on the Steam Deck under
game-mode gamescope (both trackpad and touch-passthrough dead at once =
finger events not reaching the engine). Zero behavior change when unset.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Enrico Bühler
2026-07-14 12:07:40 +02:00
parent eb4bca11c5
commit 7c72899a49
1 changed files with 46 additions and 0 deletions
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crates/pf-presenter/src/run.rs
+46
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@@ -427,6 +427,13 @@ fn run_inner(mut opts: SessionOpts, mut mode: ModeCtl) -> Result<Option<Outcome>
// events on desktop, and the door Steam's on-screen keyboard types through under
// gamescope). Toggled edge-wise — start/stop are not free on Wayland.
let mut text_input_on = false;
// One-shot on-glass touch diagnostics. Under the Deck's game-mode gamescope, Steam Input
// owns the physical touchscreen and by default emulates it as a virtual trackpad/mouse —
// so the app may see MouseMotion/MouseButton instead of the Finger* events the touch-mode
// engine feeds on (which kills BOTH trackpad and passthrough at once). Set
// `PUNKTFUNK_TOUCH_DEBUG=1` to log every raw finger AND mouse event: one run tells us
// whether native wl_touch is being delivered (Finger* with direct=true) or intercepted.
let touch_debug = std::env::var_os("PUNKTFUNK_TOUCH_DEBUG").is_some();
let outcome = 'main: loop {
// --- SDL events (input, window, gamepads) ---------------------------------------
@@ -558,11 +565,17 @@ fn run_inner(mut opts: SessionOpts, mut mode: ModeCtl) -> Result<Option<Outcome>
}
}
Event::MouseMotion { xrel, yrel, .. } => {
if touch_debug {
tracing::info!(xrel, yrel, "touch-debug: MouseMotion");
}
if let Some(cap) = stream.as_mut().and_then(|s| s.capture.as_mut()) {
cap.on_motion(xrel, yrel);
}
}
Event::MouseButtonDown { mouse_btn, .. } => {
if touch_debug {
tracing::info!(?mouse_btn, "touch-debug: MouseButtonDown");
}
if let Some(cap) = stream.as_mut().and_then(|s| s.capture.as_mut()) {
if !cap.captured() {
// The engaging click is suppressed toward the host.
@@ -574,6 +587,9 @@ fn run_inner(mut opts: SessionOpts, mut mode: ModeCtl) -> Result<Option<Outcome>
}
}
Event::MouseButtonUp { mouse_btn, .. } => {
if touch_debug {
tracing::info!(?mouse_btn, "touch-debug: MouseButtonUp");
}
if let Some(cap) = stream.as_mut().and_then(|s| s.capture.as_mut()) {
cap.on_button_up(mouse_btn);
}
@@ -597,6 +613,16 @@ fn run_inner(mut opts: SessionOpts, mut mode: ModeCtl) -> Result<Option<Outcome>
timestamp,
..
} => {
if touch_debug {
tracing::info!(
touch_id,
finger_id,
x,
y,
direct = is_direct_touch(touch_id),
"touch-debug: FingerDown"
);
}
if is_direct_touch(touch_id)
&& dispatch_finger(
FingerPhase::Down,
@@ -619,6 +645,16 @@ fn run_inner(mut opts: SessionOpts, mut mode: ModeCtl) -> Result<Option<Outcome>
timestamp,
..
} => {
if touch_debug {
tracing::info!(
touch_id,
finger_id,
x,
y,
direct = is_direct_touch(touch_id),
"touch-debug: FingerMotion"
);
}
if is_direct_touch(touch_id)
&& dispatch_finger(
FingerPhase::Move,
@@ -641,6 +677,16 @@ fn run_inner(mut opts: SessionOpts, mut mode: ModeCtl) -> Result<Option<Outcome>
timestamp,
..
} => {
if touch_debug {
tracing::info!(
touch_id,
finger_id,
x,
y,
direct = is_direct_touch(touch_id),
"touch-debug: FingerUp"
);
}
if is_direct_touch(touch_id)
&& dispatch_finger(
FingerPhase::Up,