学习三维纹理+Opengl的例子，简单易用-Study of three-dimensional texture+ Opengl examples, easy-to-use

这个是在opengl中建立X，Y坐标，在所建立的坐标中画出抛物线。这是一个基本的例子。-This is in opengl create X, Y coordinates, the coordinates in the establishment of a parabola in the draw. This is a basic example.