title: How to Multiply Matrices in openGL
body: <p>How to multiply matrices in basic openGL without GLUT or other extension packages?
  Say, I want to calculate the result of T*M, both T and M are matrices. How to implement it in openGL?</p>
  
  <p>I know it is such function called <strong>glMultMatrix*()</strong>. But it only replace the current model matrix by the result. And it's not the way to calculate matrix directly.</p>