Int 62 Fn 0061  u - Fgdriver V4.02 - "fg_inside" - Check If Point Inside   [V]

   AX = 0061h
   ES:BX -> vertex array
   CX = number of vertices
   DX = screen space column of point to test
   SI = screen space row of point to test

Return: AX = result
       0000h point is outside polygon
       0001h point is inside polygon
       undefined if not a convex polygon

Note:  the FGDRIVER functions are rearranged with each major release, but
     their parameters do not change (see #3145 at AX=0000h)

See Also: AX=0092h,AX=0093h,AX=0094h