Linux SDL库，封装了声音、键盘、鼠标、显卡等设备。-This is the Simple DirectMedia Layer, a general API that provides low level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL, and 2D framebuffer across multiple platforms

Linux SDL 库的使用,使用这个源码，可以再linux 下创建图形窗口，本例子，在图形窗口中创建了一个矩形-usage of linux SDL libary