说明：  OpenGL介绍  由SGI公司的GL发展而来的一个工业标准图形库。  OpenGL由图形库GL(Graphics Library)和应用图形库GLU(Graphics Library Utilities)两个库组成
(OpenGL# 61548 introduced by SGI's GL from the development of an industry-standard graphics library.# 61548 by the OpenGL graphics library GL (Graphics Library) and the application of graphics library GLU (Graphics Library Utilities) 2 component library)