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fix/sdl3-gamepad-bugs (#19)

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Four SDL3 gamepad fixes, all affecting real users with Switch controllers.

**Crash on reconnect / broken motion** — `GetFeaturesFlag()` was calling `SDL_DestroyProperties()` on properties owned by SDL internally, causing a use-after-free. This breaks gyro after the first read and crashes on reconnect. Fix: just don't destroy them.

**Thread safety in `GetGamepads()`** — was locking the wrong objects and holding locks across `yield` boundaries, which is undefined behavior with `System.Threading.Lock`. Fix: snapshot IDs under `_lock`, iterate outside it.

**Rumble NPE on disconnect** — `UpdateRumble()` called `_gamepad.Rumble()` without a null check; throws if the controller disconnects mid-update. Fix: `_gamepad?.Rumble(...)`.

**Linux: HIDAPI conflicts with `hid_nintendo`** — when the `hid_nintendo` kernel module is loaded, it provides evdev nodes for both the gamepad and IMU that SDL3's evdev backend correctly combines. HIDAPI conflicts with it, breaking gyro and wireless hotplug. Fix: detect `/sys/module/hid_nintendo` at startup and disable HIDAPI for Switch controllers automatically. Overridable via `SDL_JOYSTICK_HIDAPI_SWITCH=1`.

Tested with an 8BitDo Ultimate Bluetooth Controller on Linux.

Co-authored-by: schuay <36006+schuay@users.noreply.github.com>
Reviewed-on: https://git.ryujinx.app/projects/Ryubing/pulls/19
This commit is contained in:
Schuay
2026-04-18 13:54:25 +00:00
committed by LotP
parent 69c22a744e
commit 7f0e82fe48
4 changed files with 20 additions and 20 deletions
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2
src/Ryujinx.Input/HLE/NpadController.cs
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@@ -563,7 +563,7 @@ namespace Ryujinx.Input.HLE
float low = Math.Min(1f, (float)((rightVibrationValue.AmplitudeLow * 0.85 + rightVibrationValue.AmplitudeHigh * 0.15) * controllerConfig.Rumble.StrongRumble));
float high = Math.Min(1f, (float)((leftVibrationValue.AmplitudeLow * 0.15 + leftVibrationValue.AmplitudeHigh * 0.85) * controllerConfig.Rumble.WeakRumble));
_gamepad.Rumble(low, high, uint.MaxValue);
_gamepad?.Rumble(low, high, uint.MaxValue);
Logger.Debug?.Print(LogClass.Hid, $"Effect for {controllerConfig.PlayerIndex} " +
$"L.low.amp={leftVibrationValue.AmplitudeLow}, " +