output interval value. 0 if there is no vertical retrace synchronization, 1 if the buffer swap is synchronized with the vertical retrace, and -1 if late swaps happen immediately instead of waiting for the next retrace.
true on success or false on failure; call SDL_GetError() for more information.
Threadsafety: This function should only be called on the main thread.
Page generated by adrdox
Get the swap interval for the current OpenGL context.
If the system can't determine the swap interval, or there isn't a valid current context, this function will set* interval to 0 as a safe default.