说明：  OpenGL（全写Open Graphics Library）是个定义了一个跨编程语言、跨平台的编程接口的规格，它用于三维图象（二维的亦可）。OpenGL是个专业的图形程序接口，是一个功能强大，调用方便的底层图形库。
(OpenGL (full write Open Graphics Library) is a programming language defines a cross, cross-platform programming interface specification, which for three-dimensional images (two-dimensional also.) OpenGL is a professional graphics program interface, is a powerful, easy to call the underlying graphics library.)