Question

I have an opengl es application on my ipad which is basically a paint application, uses pretty much the same code as glpaint, the sample from apple.

When I run it in the simulator, everything looks fine, the lines render properly etc.
But when I put it onto the actual ipad, every time I touch the screen, the entire screen flickers as its updating, and the lines that i draw with my finger are dashed with holes in them unless I draw extremely slowly.

Any ideas?

Answer 1

You have to set the kEAGLDrawablePropertyRetainedBacking option to YES in CAEAGLLayer‘s drawableProperties property when initializing the GL view.

Reference: Apple Technical Q&A.