OpenGL or DirectX?

Question

I know this is probably a very subjective question, but I just want to start with the one which is the easiest and fastest to learn, so that I can get started with a small project of mine as fast as possible, it's a a little 2D game, to start with at least.. Which one would you recommend me to go with? And I'm using C++

Solution 1

First question: Are you on Windows? If not, use OpenGL.

If you're on Windows, this will come down to a matter of taste. The APIs are different, but the concepts required are very similar for both OpenGL and DirectX. Most things are supported on both, although they do work a bit differently.

Microsoft provides quite a few samples and a decent framework you can use for DirectX (9 or 10), which can make it easier to get started.

That being said, if you're targetting Windows Vista/Win7 only, moving to DirectX 10 may make life easier. A lot of the annoyances in DX9 and earlier were removed in DX10, and the API is a bit more clean.

That being said, if this is for a game, I'd recommend looking at using a middleware engine like Ogre instead of writing directly in DirectX OR OpenGL. This will make your life much simpler, especially while learning.

Solution 2

I haven't used DirectX, but OpenGL is fairly simple and there are some good beginner's tutorials at NeHe. Also, if you even want to go cross-platform, you'll need OpenGL.
However, DirectX isn't just a graphics library, you can also use it for sound, etc. so it's probably worth looking into.

Solution 3

If it's just 2D, then perhaps it might be worth looking into SDL, which is already cross platform and seems pretty easy to learn. There are many tutorials on the net, but one particular site I remember is Lazy Foo's SDL Tutorials. You can also mix OpenGL with SDL, there are tutorials for that as well.

If you don't want to use SDL, and you are on windows, I would recommend DirectX. I do recognize that the choice between them ultimately ends up in a flame war pretty much anywhere on the Internet, but my understanding is that DirectX is geared towards game developers, so you will find many utility libraries, functions, and classes that might facilitate various tasks. With OpenGL, you would have the ability to write cross platform code, provided that the helper functionality such as image loading is also cross platform (For which there are indeed cross platform libraries).

So my bottom line is: Both are fine, OpenGL gives you cross platform code (Provided you write it), and DirectX gives you more game development oriented tools and libraries.

Solution 4

If it's all about getting started as fast as possible, I'd recommend OpenGL on a NVidia GPU. You can throw almost anything at it and it will display something. However, if you want to achieve decent performance with low programming effort, I'd recommend Direct3D. There are too many ways to do things in OpenGL, and beginners will most certainly discover the slow paths first since they are covered by many ancient tutorials (see NeHe). Additionally, debugging OpenGL apps is painful, although tools like gDEBugger can help.

Solution 5

If you have some COM experience and it does not make your head hurt I'd recommend DirectX, just because SDK has a lot of good examples/tutorials right out of the box. If you better prefer more C-style programming or are confused with COM stuff then I'd say OpenGL.

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