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I’d like to copy the OpenGL ES framebuffer from video RAM to video RAM in my iOS game. How is this done?
Ideally I’ll do this 30 times per second. Then transfer the contents of the copied buffer to the CPU piecewise (not all at once since this causes a stutter in the game).
EDIT: I would say that you should have a look into Frame Buffer Objects (FBOs), you can find an example on the following post:
https://devforums.apple.com/message/23282#23282
This will allow you to render your scene into a texture attached to a FBO and use the texture afterwards.
PS: Thanks Christian for pointing out my mistake (I first read that MrMusic wanted to copy VRAM to RAM and wrongly suggested to use glReadPixels which is indeed unsuitable for that purpose).