NAME
    ScrollVPort -- Reinterpret RasInfo information in viewport to reflect
                    the current Offset values.

SYNOPSIS
    ScrollVPort( vp )
                 a0

    void ScrollVPort(struct viewport *);

FUNCTION
    After the programmer has adjusted the Offset values in
    the RasInfo structures of viewport, change the
    the copper lists to reflect the the Scroll positions.
    Changing the bitmap ptr in rasinfo and not changing the
    the Offsets will effect a double buffering affect.

INPUTS
    vp - pointer to a viewport structure
         that is currently be displayed.
RESULTS
    modifies hardware and intermediate copperlists to reflect
    new RasInfo

BUGS
   pokes not fast enough to avoid some visible hashing of display

SEE ALSO
    makevport() mrgcop() loadview()  graphics/view.h