The system function called drawglist() looks through the list of gels and
prepares the necessary Copper instructions and memory areas to display the
data.  This function is called as follows:

    struct RastPort myRastPort = {0};
    struct ViewPort myViewPort = {0};

    DrawGList(&myRastPort, &myViewPort);

The myRastPort argument specifies the rastport containing the gelsinfo
list with the VSprites that you want to display.  The &myViewPort argument
is a pointer to the viewport for which the vsprites will be created.