The structure that defines a display mode
Defined in SDL_video.h
typedef struct SDL_DisplayMode
{/**< pixel format */
Uint32 format; int w; /**< width, in screen coordinates */
int h; /**< height, in screen coordinates */
int refresh_rate; /**< refresh rate (or zero for unspecified) */
void *driverdata; /**< driver-specific data, initialize to 0 */
} SDL_DisplayMode;