Opne GL es learning experience!

Long time to update! Next, I will update my learning experience or notes of Open GL ES.
OpenGL ES 1.0 uses a fixed pipeline through its built-in functions to set things like lights, vertexes, colors, cameras, and so on.
OpenGL ES 2.0 uses a programmable pipeline, so you have to write any features yourself.
#import< UIKit/UIKit.h>
#import< QuartzCore/QuartzCore.h>
#import< OpenGLES/ES2/gl.h>
#import< OpenGLES/ES2/glext.h>

Reproduced in: https://www.cnblogs.com/pinping/archive/2012/05/17/2506082.html

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