SDL_QuitSubSystem
Use this function to shut down specific SDL subsystems.
Contents
Syntax
void SDL_QuitSubSystem(Uint32 flags)
Function Parameters
Code Examples
#include "SDL.h"
/* ... */
int main(int argc, char **argv) {
int sdl_initialized = 0;
sdl_initialized = !SDL_Init(0);
/* ... console stuff ... */
if (sdl_initialized && SDL_InitSubSystem(SDL_INIT_VIDEO)) {
display_graph();
SDL_QuitSubSystem(SDL_INIT_VIDEO);
}
/* ... more console stuff ... */
if (sdl_initialized) SDL_Quit();
return 0;
}
Remarks
These are the flags which may be passed to SDL_QuitSubSystem() and may be OR'd together to quit multiple subsystems simultaneously.
Include: Nothing found for "initiate multiple subsystems."!
Include: Nothing found for "This function loads"!
SDL_Init
Use this function to initialize the SDL library. This must be called before using most other SDL functions.
Syntax
int SDL_Init(Uint32 flags)
Function Parameters
flags |
subsystem initialization flags; see Remarks for details |
Return Value
Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.
Code Examples
#include "SDL.h"
int main(int argc, char* argv[])
{
if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_AUDIO) != 0) {
SDL_Log("Unable to initialize SDL: %s", SDL_GetError());
return 1;
}
/* ... */
SDL_Quit();
return 0;
}
Remarks
SDL_Init() simply forwards to calling SDL_InitSubSystem(). Therefore, the two may be used interchangeably. Though for readability of your code SDL_InitSubSystem() might be preferred.
The file I/O and threading subsystems are initialized by default. You must specifically initialize other subsystems if you use them in your application.
Logging works without initialization, too.
flags may be any of the following OR'd together:
SDL_INIT_TIMER |
timer subsystem |
SDL_INIT_AUDIO |
audio subsystem |
SDL_INIT_VIDEO |
video subsystem; automatically initializes the events subsystem |
SDL_INIT_JOYSTICK |
joystick subsystem; automatically initializes the events subsystem |
SDL_INIT_HAPTIC |
haptic (force feedback) subsystem |
SDL_INIT_GAMECONTROLLER |
controller subsystem; automatically initializes the joystick subsystem |
SDL_INIT_EVENTS |
events subsystem |
SDL_INIT_EVERYTHING |
all of the above subsystems |
SDL_INIT_NOPARACHUTE |
compatibility; this flag is ignored |
If you want to initialize subsystems separately you would call SDL_Init(0) followed by SDL_InitSubSystem() with the desired subsystem flag.
Related Functions
If you start a subsystem using a call to that subsystem's init function (for example SDL_VideoInit()) instead of SDL_Init() or SDL_InitSubSystem(), SDL_QuitSubSystem() and SDL_WasInit() will not work. You will need to use that subsystem's quit function (SDL_VideoQuit()) directly instead.
You still need to call SDL_Quit() even if you close all open subsystems with SDL_QuitSubSystem().
