The problem is simple enough, if you look at Android_OnTouch it creates a Touch device if none exist, and it scales the touches using Android_ScreenWidth/Android_ScreenHeight.

However, if you turn the device around, these values will of course change, but the scaling remains the same...so the touches are wrongly scaled.

It's an interesting hurdle what to do to solve it.

We can do a hacky thing and for every touch get the touch device pointer (which we already do) and update x_max and y_max blindly...or we can be a more elaborate and only update if x_max != Android_ScreenWidth for example.

I think the best would be to remove all touch devices when the screen size changes, the question is how... (SDL_TouchQuit ?)