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

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You need to create an EAGLSharegroup.

Check out this thread on sharing OpenGL contexts between threads.

UPDATE
Previous to iOS5 I shared OpenGL contexts between threads to allow asynchronous loading of textures from disk. But iOS5’s CVOpenGLESTextureCaches essentially make texture uploads free so I don’t need shareGroups anymore and my code is simpler and faster.

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