自己写的多线程OPENGL程序,实现了后台资源加载,从JPEG,PNG文件创建纹理,保存屏幕截图,从高度图创建地形,加载3DS模型,视锥剔除,球型天空顶,中文显示等-OPENGL write multi-threaded program, to achieve the background load of resources, from JPEG, PNG files to create texture, save screen shots, create terrain from height