P/S: My tutorials are designed especially for beginners
for them to understand the basic of OpenGL
quickly and thus can build their own program fast. Some explanations
might not be so clear, but it is confirmed that the sample programs
included with this tutorial is working fine (tested on my PC). If it is not working, then
please let me know. For more details or information regarding
OpenGL, here are the lists of the site that I recommended for you to
check.