multithreading - Android thread performance/priority on Galaxy Note 2 when screen is touched/released

Question

I have an OpenGL game for Android. It runs at a good 60fps when the screen is touched. When I release my finger it goes back down to around 30fps. Does the touch event/release raise/lower a thread's priority and if so how can I replicate this to keep it at a constant 60fps. This only seems to be an issue on Galaxy Note 2 so far.

Answer 1

I'll assume you are using onDrawFrame and setRenderMode(RENDERMODE_CONTINUOUSLY).

30 and 60FPS indicates that your implementation of onDrawFrame is called as the device's screen refreshes. Most displays refresh at 60Hz, giving you 60FPS.

It is likely that the Galaxy Note 2 has some power saving feature that limits screen refresh to 30Hz when there are no touches on screen. Check if there's any way to disable this feature.

AFAIK, OpenGL ES does not specify a standard for screen refresh rates, you will need a throttling function to ensure that your game runs/feels the same (i.e. at the same speed) despite differences in FPS.