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Bug 5445

Summary: Incorrect Switch Pro Controller face buttons when SDL_HINT_GAMECONTROLLER_USE_BUTTON_LABELS disabled
Product: SDL Reporter: jibb
Component: joystickAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: matpow2
Version: 2.0.14   
Hardware: x86_64   
OS: Windows 10   

Description jibb 2021-01-04 13:37:55 UTC 
I'm testing with DualShock 4, DualSense, Switch Pro Controller, and PowerA Switch Controller.

I'm using the standard mapping file from here:
https://raw.github.com/gabomdq/SDL_GameControllerDB/master/gamecontrollerdb.txt

With SDL_HINT_GAMECONTROLLER_USE_BUTTON_LABELS turned off (set to "0") I expect the button positions to be the same on all devices, based on Xbox controller button naming (eg SDL_GameControllerGetButton(g, SDL_CONTROLLER_BUTTON_Y) gives me whether the North face button is pressed).

However, the Switch Pro Controller layout is wrong (matching labels rather than positions, so X and Y are swapped and A and B are swapped). And with the PowerA controller the East and West buttons are correct, but the North and South buttons are swapped instead.
Comment 1 Sam Lantinga 2021-01-04 21:40:07 UTC 
Does it work correctly with the built-in SDL mappings, if you don't use gamecontrollerdb.txt? That mapping file doesn't support the hint.
Comment 2 jibb 2021-01-05 01:12:47 UTC 
(In reply to Sam Lantinga from comment #1)
> Does it work correctly with the built-in SDL mappings, if you don't use
> gamecontrollerdb.txt? That mapping file doesn't support the hint.

I've just tested it out without loading gamecontrollerdb.txt, and it still behaves incorrectly as described.
Comment 3 Mathias Kaerlev 2021-01-12 17:31:19 UTC 
Also seeing this on 2.0.14. This is most likely a regression, since we weren't seeing this on an earlier SDL version.

I suspect it might be caused by this commit:
https://github.com/spurious/SDL-mirror/commit/a569b211881c6d4c73f3f1019e9f66e754ca546b#diff-da9344d94c66b8c702a45e7649f412039f08bba83bd82de33f5c80ea9c8c39d5

It seems like both the HIDAPI driver and SDL_gamecontroller.c will try to swap the buttons if the hint is set to 0, causing the button remap to cancel out.
Comment 4 Sam Lantinga 2021-01-14 23:16:45 UTC 
Fixed, thanks guys!
https://hg.libsdl.org/SDL/rev/abc272ee7adf