Controllers cause erratic movement when enabled. about opensyobonaction-snap

[tdis8629]

I ran a few more checks, and can confirm it's an issue with deadzoning. Linked below are three videos for proof, using jstest to see the direct events (axis 0/1 is the X and Y for left joystick), AntiMicro for a visual aid (default deadzone), and the reaction in OSA. In general, the two XBox controllers are not properly centered, and rely on software deadzoning to keep them center, while the wired Steam Controller (no sc-controller driver) is perfectly centered, and can run the game perfectly fine.

I'm combing over the current port's DxLib.cpp (I'm not a C++ developer), but my guess is that it is taking an absolute direction without taking into account of controller defect. Obviously, this is an issue upstream, but if SDL can either use d-pad only or define an acceptable deadzone, this issue would be solved.

Videos:
XBox 1
XBox 360
Steam Controller

EDIT: Attached is a patch to hardcode a deadzone of ±1024 to the horizontal and vertical axis of the joystick. It's quick and dirty, but it works (apparently, you cannot submit .patch files).
DxLib_manual_deadzone.txt