Hi,

I'm changing a program from standard graphics to opengl. The way that
my program behave was:

1. Update internal bitmap information.
2. Draw on the offscreen.
3. Draw the offscreen image on screen.

On opengl, i just noticied that anything that you draw before calling
requestRender is IGNORED. My idea was to first send opengl commands
and then request opengl's surface to draw these. Is there a way to let
it work like this?

Another way to look at the problem: suppose two threads are updating
part of the screen using opengl. How exactly can one thread update the
part of the screen that it is drawing, leaving the other part
untouched?

thanks

   guich

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