Include File(s): SDL.h
The functions in this category are used to set up SDL for use and generally have global effects in your program.
To begin using SDL in your program SDL_Init() must be called before most other SDL functions. The role of SDL_Init() is to properly initialize the SDL library and start each of the various subsystems requested as part of the call.
It should be noted that on some operating systems, SDL_Init() will fail if SDL_main() has not been defined as the entry point for the program. Calling SDL_SetMainReady() prior to SDL_Init() will circumvent this failure condition, however, users should be careful when calling SDL_SetMainReady() as improper initialization may cause crashes and hard to diagnose problems.
SDL_Quit() should be called before an SDL application exits to safely shut down all subsystems, including the default ones.
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