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Bug 4707

Summary: SDL_SetRelativeMouseMode fails on Vivante
Product: SDL Reporter: Cameron Gutman <cameron.gutman>
Component: videoAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: sezeroz
Version: HG 2.0Keywords: target-2.0.10
Hardware: ARM   
OS: Linux   

Description Cameron Gutman 2019-07-03 06:05:45 UTC 
The bugfix in https://hg.libsdl.org/SDL/rev/ba1a66b57385 caused SDL_SetRelativeMouseMode() to begin failing on Vivante (Steam Link). Even though Vivante doesn't have a SetRelativeMouseMode() or WarpMouse() function, it's in relative mode already (because it uses evdev) so the function was actually working as intended.

I think providing a no-op SetRelativeMouseMode() function for Vivante is a reasonable fix. Since it's already getting relative events through evdev, it really is a no-op to "enter relative mode".

In fact, this is probably the right thing to do for all backends that use evdev (vivante, raspberry, and kmsdrm). Raspberry and kmsdrm both have WarpMouse() implementations so SDL_SetRelativeMouseMode() isn't failing there, but it still seems to make sense not to have to do the fake warping if they're evdev-based anyway.
Comment 1 Sam Lantinga 2019-07-03 22:59:05 UTC 
Fixed, thanks!
https://hg.libsdl.org/SDL/rev/abb47c384db3