thank you so much for ur precious advice. that is what we were looking for --- On Thu, 3/18/10, Andres Colubri <[email protected]> wrote:
From: Andres Colubri <[email protected]> Subject: Re: [android-developers] Re: screen flickering in GLSurfaceView To: [email protected] Date: Thursday, March 18, 2010, 6:46 AM > What happens in your case is the following (as far as i can tell). In > the first onDrawFrame() call you render some elements to the initially > black back buffer. The front buffer is also black. Now you leave > onDrawFrame() and the back buffer gets presented while the front > buffer becomes your new back buffer. But the new back buffer does not > contain the elements you just rendered! So you render your new > elements to a completely black back buffer this time so the final > image is not a composition of the first onDrawFrame and the second > one. As the buffers are constantly swaped they never have the same > content as half of the elements is in one buffer and the others are in > the other buffer. > Thanks for the explanation, this makes the source of the problem perfectly clear. > There might be a way to disable double buffering in the GLSurfaceView > if you use that. That would be nice, I wonder if it is possible to do at all... After a quick look at the source code of GLSurfaceView, it seems to me that the double buffering is hard coded into the EglHelper class. > Otherwise you will need to use EGL directly to setup > your OpenGL surface without double buffering. I'd like to avoid this, since it basically means implementing my own GLSurfaceView... > On the other hand i wonder why you don't compose your complete scene in a > single > onDrawFrame call. > Because the goal is to have an interactive drawing application controlled by the user input (brushes strokes, etc). -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
