func BlendFunc(sfactor uint32, dfactor uint32) {
	C.glowBlendFunc(gpBlendFunc, (C.GLenum)(sfactor), (C.GLenum)(dfactor))
}
func BlendFunc(sfactor uint32, dfactor uint32) {
	C.glowBlendFunc(gpBlendFunc, (C.GLenum)(sfactor), (C.GLenum)(dfactor))
}
func BlendFunc ( sfactor uint32 , dfactor uint32 ) { C . glowBlendFunc ( gpBlendFunc , ( C . GLenum ) ( sfactor ) , ( C . GLenum ) ( dfactor ) ) }
// specify pixel arithmetic
specify pixel arithmetic