###### (This is the documentation for SDL3, which is the current stable version. [SDL2](https://wiki.libsdl.org/SDL2/) was the previous version!) # SDL_GL_GetSwapInterval Get the swap interval for the current OpenGL context. ## Header File Defined in [](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_video.h) ## Syntax ```c bool SDL_GL_GetSwapInterval(int *interval); ``` ## Function Parameters | | | | | ----- | ------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | int * | **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. | ## Return Value (bool) Returns true on success or false on failure; call [SDL_GetError](SDL_GetError)() for more information. ## Remarks 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. ## Version This function is available since SDL 3.1.3. ## See Also - [SDL_GL_SetSwapInterval](SDL_GL_SetSwapInterval) ---- [CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryVideo](CategoryVideo)