func (uintComponent) PutMat2(b []byte, v [2][2]uint32) {
    binary.LittleEndian.PutUint32(b, v[0][0])
    binary.LittleEndian.PutUint32(b[4:], v[1][0])
    binary.LittleEndian.PutUint32(b[8:], v[0][1])
    binary.LittleEndian.PutUint32(b[12:], v[1][1])