https://developer.apple.com/library/mac/documentation/GraphicsImaging/Conceptual/OpenGLShaderBuilderUserGuide/Introduction/Introduction.html
https://www.opengl.org/wiki/Debugging_Tools
http://blog.nobel-joergensen.com/2013/03/10/debugging-opengl-part-3-using-tools/
原文：http://www.cnblogs.com/lilei9110/p/4147955.html