title: OpenGL ES examples that don't use EAGLContext
body: <p>I'd like to better understand the creation, allocation, and binding of OpenGL ES framebuffers, renderbuffers, etc under iOS. I understand that the EAGLContext and EAGLSharegroup classes normally manage the allocation and binding of such objects. However, the apple docs suggest that it is possible to do GL offscreen rendering without using the EAGLContext class and I'm interested in how. Does anyone have any pointers to code examples?</p>
  
  <p>I would also be interested in examples showing how to accomplish offscreen rendering with EAGLContext.</p>