Is there any faster way to access the frame buffer than using glReadPixels? I would need read-only access to a small rectangular rendering area in the frame buffer to process the data further in CPU. Performance is important because I have to perform this operation repeatedly. I have searched the web and found some approach like using Pixel Buffer Object and glMapBuffer but it seems that OpenGL ES 2.0 does not support them. Is there any faster way to access the frame buf
阅读背景：
在iPhone OpenGL 2.0中更快的选择glReadPixels。
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