Checklist :

1. Coordinates of cube vertices in 3D space
2. 3D projection matrix set up properly along with the view matrix
3. Draw lines, triangles, or quads
4. Transform coordinates using matrices and the view matrix
5. Texture your cube
6. Lighting, etc... other hard stuff

That list was more of a suggestion as to what to understand in what order. Later steps need prior steps completed, but beginning steps are not hard. How far did you get?

I recommend searching online for OpenGL tutorials. Youtube is good as well as several websites. You can do OpenGL in Allegro as well once set up right.

Good morning Edgar:
Thanks for doing this for me! Its GREAT!!
I tried compiling the SpinningCubeMain.cpp using my Linux
machine and received the following error: undefined reference
to symbol (Gl_DepthFunc). I did some research and thinking my
openGL needed to be updated. I found that the function is included
in both 3 and 4 versions. I don't know why Code:Blocks is not picking
it up. If you think Linux may be the problem, I will have to load
Allegro and openGL on my XP machine to be able to try out your code!
I also thought that I would try the g++ compiler. It is loaded on my
machine but Code:Blocks is not picking that up.
OH, my problems continue! Hope your day is going fine!
Thanks for your time! I need to quit sitting around and thinking
things up! Talk later my friend!

Hi Edgar:
I am running Code:Blocks on Ubuntu. I have been trying to find
where they put the Opengl library! All my libraries end in .so.
They are usually in /usr/lib but I can't find it! I will continue
to see what I can come up with. If I knew exactly what it was called,
I could use g++ at the command line. This is getting very interesting!
I tried to run the EXE file on XP, but there was a problem with msvcrt.dll.
Windows reported: The procedure entry point _time32 could not be located
in the dynamic link library msvcrt.dll, whatever that means. I have had
some luck with GLUT, but I have to use the command line to get anything
to work! Code:Blocks kicks out errors about not finding functions!
Hope all is well with you!

Hi Edgar:
In order to install allegro I could have used apt-get install or
went through Synaptic Package Manager.If it was a .deb package I would
have used GDebi Package Installer.
All of my libraries were found in /usr/lib/i386-linux-gnu. Then I loaded
Code:Blocks, went to Settings, Compiler, Linker Settings and typed the
libraries under Linker libraries. Everything worked fine. This morning I
also typed in the libraries for GL, GLU and GLUT. Now all that is working.
When I try to install Opengl, I get the message that I already have the
latest version installed. If I continue to have problems, I will do as you
say. But since you say I might have problems, I will backup my complete
system before I do it. Also, since GLUT calls Opengl functions, I would
believe that Opengl is fine, I just can't find it. This is very interesting
to say the least. On another note: since GLUT will do all the graphics, do
I still need to use Allegro? Just a thought. Have a great day!

Before I closed, I wanted to check to see if what you said was loaded:
libgl1-mesa-dev version 10.1.3 is loaded
libglu1-dev version 9.0.0-2 is loaded

Given the choice, Allegro is a FAR better one over GLUT. GLUT is very limited. You're better off picking the library you wish to use to make your game with and learning with it, like Allegro.

In the end, once your library like GLUT or Allegro sets up the OpenGL context, they don't have much more to do with it. But they can give you more or less options you will need for a game. And Allegro is very nice for cross platform development. Partnered with OpenGL they make a great pair.

Hi Edgar:
I am COMPLETELY LOST! I have no idea what to do now!
I am going to have to do more studying and try to figure
this thing out! There seems to be much I know nothing about!

Hi Edgar:
I am finally getting something to happen using GLUT. I never
found where the library for Opengl was located, but Glut knows
where it is because my very simple programs run fine. Also, as
far as I can determine my graphics card only supports version
2.1 of Opengl. I think they have version 3 or maybe 4 now. This
may limit me as to what I can do, but it will be way in the future
before I need to worry about that. Thanks for all you do on this
site! You seem to have it all figured out and that's a good thing!
Hope all is well with you!

Edgar:
I already have those loaded including glut.