help

[HP_]

i need some sites that teach DirectX (DirectShow) step by step. also , openGL. any?.

[STLDude]

Start here and specially check their forums.

[Bornish]

DirectX:
If you really want to start from somewhere, Wikipedia quite good option:
http://en.wikipedia.org/wiki/DirectX
I think it's always best to look first at the original documentation (MSDN), and a good starting point would be the FAQ:
http://msdn.microsoft.com/en-us/libr...21(VS.85).aspx
Like STLDude, it seems like a good idea for a developer to learn from other's experience, so, depending on which product you're developing, see what else is out there... if you're writting a game, search in respective forums...
OpenGL:
From my experience with OpenGL, best to start are tutorials; are plenty available online, for almost all purposes; most of them provide working code samples that help reducing the learning curve. Here's the link for tutorials provided by OpenGL organization, including a few about GLUT toolkit (easier to use for beginners):
http://www.opengl.org/code/

As a graphics developer, you should try to identify your target environments, in order to correctly define which version of DirectX / OpenGL is required for your implementation. Using OpenGL is even a bit more tricky, since many companies compile their own version of the libraries, and the OpenGL support is bound to graphics card's manufacturers ability to "respect the standard", meaning that some drivers for graphics cards mention in documentation full support for OpenGL 2.0, but in fact, many advanced APIs are not implemented or buggy.
If you haven't decided to use DirectX or OpenGL, I would suggest some sample code testing on a few common (widely available) graphics cards, before making the decision.

After preparing a draft of requirements, you are welcome to return to this forum with specific questions; I would gladly try to help.

Best regards,