code: public Vector2d mulPosition(Matrix3x2dc mat, Vector2d dest) {
          double rx = mat.m00() * x + mat.m10() * y + mat.m20();
          double ry = mat.m01() * x + mat.m11() * y + mat.m21();
          dest.x = rx;
          dest.y = ry;
          return dest;
      }
docs: /* (non-Javadoc)
  @see org.joml.Vector2dc#mulPosition(org.joml.Matrix3x2dc, org.joml.Vector2d)