这是一份非常好的关于openGL的入门教程，从最基本的搭建框架到最后可以比较独立的实现事物的虚拟过程，都有非常详细的讲解。(This is a very good tutorial on the openGL, from the most basic fr a mework to the last can be relatively independent of the virtual process of things, have a very detailed explanation.)