INT 62 u - FGDRIVER v3.03 - "FG_POLYFILL" - DRAW A FILLED CONVEX POLYGON
        AX = 0078h
        CX = number of vertices
        ES:BX -> variable pointer record (see below)
Notes:  For FGDRIVER v1.10, this function was "FG_BUTTON" (see AX=0009h);
           "FG_POLYFILL" did not exist yet
        The vertex array consists of pairs of words specifying the X and Y
          coordinates of each vertex; the work array is used internally and
          must contain at least four times as many bytes as the polygon is
          high in pixels
        This function is ignored in text modes
        If the polygon is non-convex, only a portion of it may be filled
SeeAlso: AX=000Eh,AX=0025h,AX=0079h,AX=007Ah,AX=007Bh

Format of variable pointer record:
Offset  Size    Description
 00h    WORD    segment of vertex array
 02h    WORD    offset of vertex array
 04h    WORD    segment of work array
 06h    WORD    offset of work array

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