NAME
    InitVPort - Initialize viewport structure.
SYNOPSIS
    InitVPort( vp )
               a0
    void InitVPort( struct viewport * );
FUNCTION
    Initialize viewport structure to default values.
INPUTS
    vp - pointer to a viewport structure
RESULT
    viewport structure set to all 0's. (1.0,1.1)
    New field added SpritePriorities, initialized to 0x24 (1.2)
BUGS
SEE ALSO
    makevport() graphics/view.h