It's a DirectX9 based engine, using the D3DX sprite functions for drawing - pretty basic. I got up and running with the tutorials at http://www.directxtutorial.com/LessonList.aspx?listid=9
, and then used the DX9 references on MSDN after that. For creating the window etc. I just used the Win32 API (I learned by looking up the functions from the basic Win32 template that comes with Visual Studio 2012).
For C I read the GNU reference manual ( http://www.gnu.org/software/gnu-c-manual/gnu-c-manual.html
) and for C++ the tutorial on http://www.cplusplus.com/
, and learned the basic C/C++ libraries and STL from that site too (vector<> map<> and string<> are really useful). I used some of the Boost libraries too - property_tree, filesystem, random, and a couple others - lots of good stuff in there - http://www.boost.org/
This is getting long
. Anyway for engine structure I stole a lot of ideas from Unity - I like a lot of their architecture and organization. Tried to make it so I can swap in an OpenGL renderer and other platform windowing/input etc. pretty easy in the future.
And yeah, FMOD for sound - they have a good help file.
BMFont for sprite fonts - had to cook my own renderer using the font files it generates.
I plan to do fancy stuff in the future (shaders, advanced audio, a little 3D here and there, etc.) so am mostly building my own stuff, but for small sprite-based games something like SDL or SFML would be a lot less time up front and more portable out of the box (but less flexible for doing advanced stuff later maybe).
Hope that helps
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