Function sdl2_sys::SDL_GL_GetSwapInterval

pub unsafe extern "C" fn SDL_GL_GetSwapInterval() -> c_int

\brief Get the swap interval for the current OpenGL context.

\return 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. If the system can't determine the swap interval, or there isn't a valid current context, this will return 0 as a safe default.

\sa SDL_GL_SetSwapInterval()