OpenGL编程轻松入门之一个简单的例子，绘制一个彩色的三角形。除此以外，我们还可以看到典型的OpenGL程序结构及openGL的运行顺序。 -OpenGL programming easy entry of a simple example, to draw a colored triangle. In addition, we can also see the running order of the typical program structure and openGL of Ope