How can I efficiently create a CGImageRef from the EAGLView's framebuffer contents using glReadPixels? Perhaps I can "render directly to a texture"?
I'm relatively new to OpenGL ES so any help is much appreciated!
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The function glReadPixels is very expensive... if you want to render to a texture you could take a look at:
- iPhone post-processing with a single FBO with Opengl ES 2.0?
- Rendering to texture on iOS OpenGL ES—works on simulator, but not on device
- Writing to then reading from an offscreen FBO on iPhone; works on simulator but not on device? (answer is at end of question...)
- http://developer.apple.com/library/ios/#qa/qa1704/_index.html
- http://www.visualnewt.com/OpenGL/learning_iphones_opengl_es/
- http://www.khronos.org/opengles/sdk/docs/man/xhtml/glCopyTexImage2D.xml
For a reference of OpenGL ES on iOS see http://developer.apple.com/library/ios/#documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/Glossary/Glossary.html
