Basic usage of the class FrameBuffer:
-------------------------------------


  Initialization: (e.g., in main() after glutCreateWindow())
  ----------------------------------------------------------

  FrameBuffer *fbo = new FrameBuffer( 512      /* width                       */,
                                      512      /* height                      */,
                                      GL_RGBA  /* format of color buffer      */,
                                      1        /* number of color buffers     */,          
                                      1        /* 1 or 0, has a depth buffer? */, 
                                      "fbName" /* name of FBO (optional)      */ );

  if (fbo->CheckFramebufferStatus(0) != GL_FRAMEBUFFER_COMPLETE_EXT)
       ; /* Then there's an error, so you can't use fbo to render into! */




  Drawing into the framebuffer object (FrameBuffer *fbo), in your display routine:
  --------------------------------------------------------------------------------


  fbo->BindBuffer();
  glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );  /* clear the buffers           */
  glViewport( 0, 0, fbo->GetWidth(), fbo->GetHeight() ); /* set drawing area correctly  */
  
  /* put gl drawing commands here, like in your display routine                         */
  /* you need not call glutSwapBuffers(), though you might want to call glFlush();      */

  fbo->UnbindBuffer();
  glViewport( 0, 0, screen_width, screen_height ); /* set viewport back to window size. */




  Using the stuff you drew into your Framebuffer Object as a texture:
       (NOTE:  This CANNOT be between fbo->BindBuffer() and fbo->UnbindBuffer())
  ------------------------------------------------------------------------------

  glBindTexture( GL_TEXTURE_2D, fbo->GetColorTextureID(0) );  // or GetDepthTextureID() 
  glEnable( GL_TEXTURE_2D );

  /* draw geometry with texture coordinates */

  glDisable( GL_TEXTURE_2D );
  glBindTexture( GL_TEXTURE_2D, 0 ); // to make sure you can draw into the texture again!