sdl_gl_getattribute(3) - Linux man page
Name
SDL_GL_GetAttribute - Get the value of a special SDL/OpenGL attributeSynopsis
#include "SDL.h"
int SDL_GL_GetAttribute(SDLGLattr attr, int *value);
Description
Places the value of the SDL/OpenGL attribute attr into value. This is useful after a call to SDL_SetVideoMode to check whether your attributes have been set as you expected.
Return Value
Returns 0 on success, or -1 on an error.
See Also
SDL_GL_SetAttribute, GL Attributes