OpenGl中的二维裁剪算法，实现直线段相对于给定窗口的裁减，主要采用梁友栋－barsky算法，-OpenGl the two-dimensional cutting algorithm, and of the linear phase for a given window of the reduction, used mainly friends of Liang Dong-barsky algorithm,

利用OpenGL实现Cohen-Sutherland裁剪算法（编码裁剪算法），是最早的直线段裁剪算法。-The use of OpenGL implementations Cohen-Sutherland clipping algorithm (coded clipping algorithm), is the first straight line clipping algorithm.