OpenGL: Stereoscopic rendering

Source: http://www.orthostereo.com/geometryopengl.html

Example:

GLvoid display(GLvoid)
{
  glDrawBuffer(GL_BACK);                                   //draw into both back buffers
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);      //clear color and depth buffers

  glDrawBuffer(GL_BACK_LEFT);                              //draw into back left buffer
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();                                        //reset modelview matrix
  gluLookAt(-IOD/2,                                        //set camera position  x=-IOD/2
            0.0,                                           //                     y=0.0
            0.0,                                           //                     z=0.0
            0.0,                                           //set camera "look at" x=0.0
            0.0,                                           //                     y=0.0
            screenZ,                                       //                     z=screenplane
            0.0,                                           //set camera up vector x=0.0
            1.0,                                           //                     y=1.0
            0.0);                                          //                     z=0.0
  
  glPushMatrix();
  {
    glTranslatef(0.0, 0.0, depthZ);                        //translate to screenplane
    drawscene();
  }
  glPopMatrix();

  glDrawBuffer(GL_BACK_RIGHT);                             //draw into back right buffer
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();                                        //reset modelview matrix
  gluLookAt(IOD/2, 0.0, 0.0, 0.0, 0.0, screenZ,            //as for left buffer with camera position at:
            0.0, 1.0, 0.0);                                //                     (IOD/2, 0.0, 0.0)

  glPushMatrix();
  {
    glTranslatef(0.0, 0.0, depthZ);                        //translate to screenplane
    drawscene();
  }
  glPopMatrix();
  
  glutSwapBuffers();
}