[android-developers] Re: GLSurfaceView lag/delay on Galaxy S3.

Hi Edvinas,

I need to ask again, because I think that may be the cause of the delay: how do you communicate the touch events to your rendering thread? Because Android can bombard your UI thread with lots of touch events in no time. But your rendering thread needs to "peek" before updating the game state in regular intervals into the current state of touch input. It's your game loop / rendering thread that needs to dictate the rhythm in order to synchronize the "whole experience".

What I do in my game is the following:

1. Touch input event handler receives all motion events on UI thread
---> converts motion event data into a custom data structure and puts it into one queue that belongs to UI thread

2. Simultaneously the game loop / render thread updates the game state and checks for input first:
---> It requests the data from touch handler in a thread safe manner (synchronized)
-------> Touch handler internally swaps motion data queue A with a secondary motion data queue B
-------> Touch handler returns queue A to game loop
---> Game loop / render thread processes queue data and recycles all motion data structures (so they can be re-used in order to avoid garbage collection activity)

And that repeats like this and these two queues get always swapped. That way you let your game loop determine the pace.

On Thursday, August 1, 2013 4:30:57 AM UTC-5, Edvinas Kilbauskas wrote:

OK, I did that. And yes. It doesn't have the delay anymore! But the problem is... It's Canvas. I don't need canvas, it doesn't fulfill my needs. I need OpenGL.

What the hell could be wrong? This is REALLY strange. OpenGL ES 1.0 has delay, ES 1.1 has delay, ES 2.0 has delay. Canvas - no delay!

This should be other way around, because as far as I know canvas uses software rendering, while OpenGL uses hardware, which should be way faster!

Any more ideas?

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