SDL_TouchDeviceType

typedef enum SDL_TouchDeviceType
{
    SDL_TOUCH_DEVICE_INVALID = -1,
    SDL_TOUCH_DEVICE_DIRECT,            /**< touch screen with window-relative coordinates */
    SDL_TOUCH_DEVICE_INDIRECT_ABSOLUTE, /**< trackpad with absolute device coordinates */
    SDL_TOUCH_DEVICE_INDIRECT_RELATIVE  /**< trackpad with screen cursor-relative coordinates */
} SDL_TouchDeviceType;