SDL_GL_GetSwapInterval - Man Page

#include <SDL3/SDL_video.h>

bool SDL_GL_GetSwapInterval(int *interval);

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.

interval

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.

Returns true on success or false on failure; call SDL_GetError() for more information.

This function should only be called on the main thread.

This function is available since SDL 3.2.0.

SDL_GL_SetSwapInterval(3)

SDL_GL_SetSwapInterval(3).