How to use OpenGL ES on a separate thread on iphone?

Question

The OpenGL ES rendering loop is placed on a separate thread in my iphone application. Everything goes fine except that the EAGLContext's presentRenderbuffer method fails. The result is a blank white screen. When the same code is run on the main thread, presentRenderbuffer succeeds and the graphics is properly shown. What is the correct way of doing OpenGL on a separate thread?

Answer 1

You shouldn't render the context on a different thread. Instead, do all the calculations on a different thread, and then ensure the rendering occurs on the main display thread.

Answer 2

You need to create an EAGLSharegroup.

Check out this thread on sharing OpenGL contexts between threads.