SDL 是Simple DirectMedia Layer （简易直控媒体层）的缩写。它是一个跨平台的多媒
体库， 以用于直接控制底层的多媒体硬件的接口。这些多媒体功能包括了音频、键盘和鼠标
（事件）、游戏摇杆等。当然，最为重要的是提供了2D 图形帧缓冲（ framebuffer ）的接口，
以及为OpenGL 与各种操作系统之间提供了统一的标准接口以实现3D 图形。从这些属性我
们可以看出， SDL 基本上可以认为是为以电脑游戏为核心开发的多媒体库。(SDL is the abbreviation of the Simple DirectMedia Layer (simple direct control media layer). It's a cross platform multi - medium

A body library, which is used to directly control the interface of the underlying multimedia hardware. These multimedia functions include audio, keyboard, and mouse

(event), game rocker, etc. Of course, the most important thing is to provide an interface to the 2D graphics frame buffer (framebuffer).

And provide a unified standard interface between OpenGL and various operating systems to implement 3D graphics. From these attributes I

As you can see, SDL is basically thought to be a multimedia library that is developed at the core of computer games.)