VG3_window_update()Flush drawn data to window to show the contents.
void VG3_window_update(void *wstruct, int xdelta, int ydelta)
|xdelta||Horizontal adjustment of the window contents, or 0 = no adjustment|
|ydelta||Vertical adjustment of the window contents, or 0 = no adjustment|
This function causes the window to show the data drawn to it. Without calling this function, the window would remain black. Horizontal and/or vertical adjustment can simulate a shaking of the contents.