func (ushortComponent) PutVec4(b []byte, v [4]uint16) {
    binary.LittleEndian.PutUint16(b, v[0])
    binary.LittleEndian.PutUint16(b[2:], v[1])
    binary.LittleEndian.PutUint16(b[4:], v[2])
    binary.LittleEndian.PutUint16(b[6:], v[3])