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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
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crates/punktfunk-host/src/punktfunk1.rs
+12
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@@ -2091,6 +2091,11 @@ fn pick_gamepad(pref: GamepadPref, env: Option<&str>, linux: bool, windows: bool
// Steam Deck: Linux UHID hid-steam. The classic Steam Controller's backend isn't built yet,
// so it folds to Xbox360 for now (Windows Steam devices are M7).
GamepadPref::SteamDeck if linux => GamepadPref::SteamDeck,
// No virtual Deck on Windows (M7) — fold to DualSense, the closest rich pad: its
// backend keeps gyro + trackpads + pad-click alive (the Deck's dual pads split the
// DualSense touchpad left/right per DsState::apply_rich). Folding to Xbox360 dropped
// all of that silently.
GamepadPref::SteamDeck if windows => GamepadPref::DualSense,
_ => GamepadPref::Xbox360,
}
}
@@ -4180,6 +4185,13 @@ mod tests {
assert_eq!(pick_gamepad(XboxOne, None, true, false), XboxOne);
assert_eq!(pick_gamepad(Auto, Some("series"), true, false), XboxOne);
assert_eq!(pick_gamepad(XboxOne, None, false, true), Xbox360);
// Steam Deck: native on Linux; folds to DualSense on Windows (keeps gyro + trackpads
// via the UMDF backend — Xbox360 would drop the whole rich plane); Xbox360 elsewhere.
assert_eq!(pick_gamepad(SteamDeck, None, true, false), SteamDeck);
assert_eq!(pick_gamepad(SteamDeck, None, false, true), DualSense);
assert_eq!(pick_gamepad(Auto, Some("deck"), false, true), DualSense);
assert_eq!(pick_gamepad(SteamDeck, None, false, false), Xbox360);
}
#[test]