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Bug 4276

Summary: No way to detect orientation flip on iOS
Product: SDL Reporter: Ryan David Sheasby <ryan27968>
Component: eventsAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: API change    
Priority: P2 CC: ryan27968
Version: don't know   
Hardware: iPhone/iPod touch   
OS: iOS 9   

Description Ryan David Sheasby 2018-09-27 13:04:21 UTC 
Hi team. I've run into a problem with Love2d(based on SDL obviously) on iOS. When you do an orientation flip(not a rotation from portrait to landscape, a flip from portrait to upside-down portrait or something like that), there is no event triggered from SDL. The only orientation-based event is SDL_WINDOWEVENT_RESIZED which is only triggered when changing dimensions i.e. portrait <-> landscape. This is a crucial missing functionality. This is especially problematic due to the fact that accelerometer data is constant meaning it does not get inverted when you flip the device. Hence an accelerometer-based driving game for example would have to be locked to a single orientation as wheen you flip the device the steering would be inverted.
Comment 1 Sam Lantinga 2018-09-27 21:51:36 UTC 
In SDL 2.0.9 you use the function SDL_GetDisplayOrientation(), and watch for the event SDL_DISPLAYEVENT to detect changes.

You can get a prerelease version here:
http://www.libsdl.org/tmp/SDL-2.0.zip

Cheers!