This is a special-case piece of functionality, generally these are expected
to go away during shutdown, but maybe someone is switching between audio
subsystems or something...
SDL2 would set a high bit in the mouse button flags to indicate when raw input had been read from, without this, if you hold down a mouse button and left raw input mode (leaving relative mode) the button would remain partially stuck, and would require two clicks to start producing mouse down events again.
SDL3's raw input code was refactored to not use the mouse button flags, but forgot to invalidate the flags, causing this bug to manifest.
- Check for specific availability instead of waiting for "device ready."
- Don't use snd_pcm_wait, just use a simple SDL_Delay (nothing to recover).
- Fixed SDL_max call that should have been SDL_min (now using SDL_clamp).
- ALSA_RecordDevice() now returns 0 if no availability, which kicks us back
to WaitDevice to try again, as an extra safety check.
Also made accelerometer threshold for drift calibration more lenient for very noisy accelerometers.
The testcontroller tool could eventually be used to come up with a better way to profile an IMU's "stationary" noise so that this threshold can be as tight as necessary for the sake of automatic drift calibration.
(thanks @HilariousCow!)
Flydigi IMU rate now matches observed rate of packets in both dongle and wired connection.
Flydigi Vader 4 Pro IMU rate correction was set at a fixed 125hz. In actuality rate is 1000hz over dongle and 500hz when wired.
Gathered correct IMU polling rate in wired mode for good gyro synchronization.
Wireless: different models had different amounts of Bluetooth packet loss.
USB_PRODUCT_8BITDO_ULTIMATE2_WIRELESS: Solid 120hz over bluetooth (note: only appears via).
USB_PRODUCT_8BITDO_PRO_2_BT: Lossy - 80-90hz registered.
SB_PRODUCT_8BITDO_SN30_PRO_BT & USB_PRODUCT_8BITDO_SN30_PRO_BT: Very Lossy - 60-90hz registered
* Added tools to Test Controller for evaluating gyroscope accuracy and IMU polling rates.
This adds a visual suite to the testcontroller tool to help validate IMU data from new gamepad drivers and HID implementations.
The 3D gizmo renders accumulated rotation using quaternion integration of gyroscope packets. If a controller is rotated 90° in real space, the gizmo should reflect a 90° change, allowing quick detection of incorrect sensitivity or misaligned axes.
Also includes:
- Euler angle readout (pitch, yaw, roll)
- Real-time drift calibration display with noise gating and progress
- Accelerometer vector overlay
- Live polling rate estimation to verify update frequency
Intended for developers working on controller firmware or SDL backend support to confirm correctness of IMU data processing.
The pointer warp protocol allows us to warp the pointer to a different position on
the surface, without any hacks like locking and unlocking the pointer.
