Recently I decided to add 3D graphics to my game (swarm.bentatman.co.uk, blog.bentatman.co.uk) to make the game more enjoyable, however I am not sure of anything to do with OpenGL. Are there any good tutorials about it?

Also, if you can, can you go to the (first) website and see if there are any other things I should add to the game, and, if indeed I should add graphics (see my blog post on the second website about graphics).

OpenGL is the same regardless of language.

Not a good idea, unless you have artists. It is your decision, though.

This should get you started:
http://www.opengl.org/documentation/red_book/
http://fly.cc.fer.hr/~unreal/theredbook/

Also I liked "Computer Graphics using OpenGL" by Francis Hill - that book covers a lot of ground.

And you'll definitely want to check www.opengl.org.

To use OpenGL on multiple platforms you'll need cross-platform library to initialize it - libsdl or Qt 4.

Please note that OpenGL/3d graphics is a HUGE subject whose difficulty is on par (or surpasses) C++ programming language. Also, there are multiple versions, and starting with version 3.0 OpenGL heavily concentrates on shaders, which is another huge topic.

What I meant by that was because many of the tutorials I have found are C++ ones, so I was looking for one more centered around C.

The idea is still in the pipeline, but I thought I could try it. If it doesn't work, then it is no massive problem, but if it does, great!
Thanks for the links. I will check them out.

There's no difference between using OpenGL in C++, C, Pascal, Python or any other language. API is the same regardless of language.

If you feel particularly adventurous, you could go to opengl.org and start reading specification for version 1.4 (anything newer than that will concentrate on shaders, which will induce massive headache for beginner), but that may be difficult.

Or you could start with either "red book" or "Computer Graphics using OpenGL".

Ah, ok. I am going to read through the openGL website, and see.

Check out Nehe's series of "legacy" tutorials, which are still current and accurate. They're written for OpenGL 2, so they still work perfectly:

Nehe Productions

The ones that I've read do indeed provide example code in C.

The OpenGL Superbible, which is a very good tutorial-style book on OpenGL (you have to buy it though), also gives all its example code in C.

Nice, thanks for the links.

Well, it doesn't quite work this way. OpenGL starting with version 3 introduced core and compatibility profile. "compatibility" profile is backwards compatible with OpenGL 2, but "core" profile is not (and it is shader-centric). Deprecated features that are not present in "core" profile include glVertex2f, entire fixed-function rendering pipeline (lighting) and all matrix functions - all those functions were heavily used in OpenGL 2. See OpenGL 3.2 specification appendix E. Modern hardware supports OpenGL 3 or 4.

Fortunately, libraries such as LibSDL provide "compatibility" profile by default.

Also NeHe (in addition to weird color scheme) has a bad habit of posting windows-only tutorials (for example, tutorial that uses wglUseFontOutlines), which pretty much defeats the point of using OpenGL.

BUMP!

I've since found this free online book, which covers OpenGL 3 and is supposed to be very good:

http://www.arcsynthesis.org/gltut/

Perfect! Thanks.