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feat(host): fold Steam Deck to DualSense on Windows; split-pad touch + pad clicks

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A Deck client asking for 'steamdeck' on a Windows host resolved to Xbox360,
whose apply_rich is a no-op — gyro and both trackpads silently discarded.
Windows already ships a full DualSense backend (UMDF driver, touchpad +
motion, wire units 1:1), so pick_gamepad now folds SteamDeck -> DualSense
there.

The three near-identical DualSense-family appliers (Linux UHID, Windows
DualSense, Windows DS4) are hoisted into one shared
dualsense_proto::DsState::apply_rich, with two mapping upgrades for Steam
dual-pad clients everywhere:
 * the Deck's two pads SPLIT the single DualSense touchpad — left pad ->
   contact 0 on the left half, right pad -> contact 1 on the right half —
   mirroring the physical thumb layout and the split-pad zones games and
   Steam Input already use (the left pad was previously dropped outright)
 * TouchpadEx pad clicks now press the touchpad-click button (persisted
   in DsState::touch_click, OR-ed in by both serializers; previously
   dropped by every DualSense-family backend, Linux included)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Enrico Bühler
2026-07-08 10:50:53 +02:00
parent 9ca672d434
commit e6d9454251
6 changed files with 236 additions and 127 deletions
Download Patch File Download Diff File Expand all files Collapse all files
crates/punktfunk-host/src/inject/linux/dualsense.rs
+4 -44
View File
@@ -249,6 +249,7 @@ impl DualSenseManager {
s.touch = prev.touch;
s.gyro = prev.gyro;
s.accel = prev.accel;
s.touch_click = prev.touch_click;
self.state[idx] = s;
self.write(idx);
}
@@ -267,50 +268,9 @@ impl DualSenseManager {
if idx >= MAX_PADS || self.pads[idx].is_none() {
return;
}
match rich {
RichInput::Touchpad {
finger,
active,
x,
y,
..
} => {
// The DualSense touchpad carries two contacts; clamp to a valid slot and keep the
// reported contact id consistent with it (the wire `finger` is untrusted).
let slot = (finger as usize).min(1);
let t = &mut self.state[idx].touch[slot];
t.active = active;
t.id = slot as u8;
// Normalized 0..=65535 → the touchpad's coordinate range (0..=W-1 / 0..=H-1,
// what the kernel advertises as the ABS_MT extents).
t.x = ((x as u32 * (DS_TOUCH_W - 1) as u32) / u16::MAX as u32) as u16;
t.y = ((y as u32 * (DS_TOUCH_H - 1) as u32) / u16::MAX as u32) as u16;
}
RichInput::Motion { gyro, accel, .. } => {
self.state[idx].gyro = gyro;
self.state[idx].accel = accel;
}
RichInput::TouchpadEx {
surface,
finger,
touch,
x,
y,
..
} => {
// A Steam right/single pad maps onto the one DualSense touchpad (signed centre-0 →
// 0..=65535); surface 1 (the Steam left pad) has no DualSense equivalent.
if surface != 1 {
let slot = (finger as usize).min(1);
let n = |v: i16| ((v as i32) + 32768) as u32;
let t = &mut self.state[idx].touch[slot];
t.active = touch;
t.id = slot as u8;
t.x = (n(x) * (DS_TOUCH_W - 1) as u32 / u16::MAX as u32) as u16;
t.y = (n(y) * (DS_TOUCH_H - 1) as u32 / u16::MAX as u32) as u16;
}
}
}
// The shared DualSense-family mapping (dualsense_proto::DsState::apply_rich): Steam
// dual pads split the one touchpad left/right, pad clicks ride touch_click.
self.state[idx].apply_rich(rich, DS_TOUCH_W, DS_TOUCH_H);
self.write(idx);
}