SDL_GL_GetSwapInterval - Get the swap interval for the current OpenGL context.

       This function is available since SDL 3.2.0.

       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.

       SDL_GL_GetSwapInterval - Get the swap interval for the current OpenGL context.

       for more information.

SDL_GL_SetSwapInterval(3)

Simple Directmedia Layer                           SDL 3.2.20                          SDL_GL_GetSwapInterval(3)

#include<SDL3/SDL_video.h>boolSDL_GL_GetSwapInterval(int*interval);

       This function should only be called on the main thread.