What features does DirectX have?
it is difficult to give a precise answer in a couple of words: the directx libraries are huge. However, the idea is that these libraries expose an api (a set of instructions) that allow game programmers to easily develop software. For example they don't have to deal with the particular aspects of each video card: that is done by directX and by the drivers.
What kind of functionality directX expose: for ex. you have an image and you need to move it. Passing appropriate parameters, directX will do that for you. Also there are implementations for sound, etc.
This is what one can do with directX. It is the bread and butter for game programmers that target Microsoft platforms. Make no mistake though: you don't get to do something till you spend some time studying.
DirectX 9.0c is not available for Windows 7; to actually install DirectX 9.0c, you would have to downgrade to Windows XP (any edition). In order to play games which require DirectX 9.0c without downgrading your installation of Windows, you must upgrade to DirectX 10.1 or later. DirectX 10.0 (initially included in Windows 7) did not include support for DirectX 9.0c, a decision that Microsoft ultimately repealed when DirectX 10.1 was released.
Since the release of DirectX 8.0 graphics cards have used programs/instructions known as Shader Models to help interpret instructions on how to render graphics sent from the CPU to the graphic card. Many games are increasingly listing Shader Model versions in their system requirements. However these shader versions are tied to the version of DirectX that you have installed on your PC which is then in turn tied to your graphics card. This can make…
There is no need to download DirectX 3. Versions of DirectX up to DirectX 9 are backwards-compatible. So if you have one version, you can use games and programs that require a previous version. Besides, the DirectX 3 installerwasmeant to be used only on Windows 95, and would probably cause problems if installed on later versions.