【SDL】SDL学习笔记一 SDL的子系统的初始化和退出

使用SDL库之前需要装载各个子系统，就像要放电影，必须给播放器提供影片一样，程序退出的时候，应该先退出子系统，释放资源。

​1. 初始化SDL函数​

该函数必须是在程序开始的地方调用

int SDL_Init(Uint32 flags)

flags参数的取值:

/* As of version 0.5, SDL is loaded dynamically into the application */

/* These are the flags which may be passed to SDL_Init() -- you should
   specify the subsystems which you will be using in your application.
*/
#define SDL_INIT_TIMER      0x00000001<span >   </span>//定时器
#define SDL_INIT_AUDIO      0x00000010  //音频
#define SDL_INIT_VIDEO      0x00000020  //视频
#define SDL_INIT_CDROM      0x00000100  //光驱
#define SDL_INIT_JOYSTICK   0x00000200  //游戏摇杆
#define SDL_INIT_NOPARACHUTE    0x00100000  /* Don't catch fatal signals */ //过滤异常信号
#define SDL_INIT_EVENTTHREAD    0x01000000  /* Not supported on all OS's */ 
#define SDL_INIT_EVERYTHING 0x0000FFFF //初始化全部子系统