func PixelZoom(xfactor float32, yfactor float32) {
	C.glowPixelZoom(gpPixelZoom, (C.GLfloat)(xfactor), (C.GLfloat)(yfactor))
}
func PixelZoom(xfactor float32, yfactor float32) {
	C.glowPixelZoom(gpPixelZoom, (C.GLfloat)(xfactor), (C.GLfloat)(yfactor))
}
func PixelZoom ( xfactor float32 , yfactor float32 ) { C . glowPixelZoom ( gpPixelZoom , ( C . GLfloat ) ( xfactor ) , ( C . GLfloat ) ( yfactor ) ) }
// specify the pixel zoom factors
specify the pixel zoom factors