DirectX 10 - major update to the DirectX API

DirectX 10 is a major update to the DirectX API. Available only in Windows Vista, earlier versions of Windows cannot run applications that rely solely on this version of the API. The changes made by DirectX 10 are profound, but they are really only affected by the Direct3D part. Many parts of the DirectX API are considered obsolete in the latest SDK version and are present only for compatibility purposes: DirectInput is replaced by XInput, DirectSound in favor of XACT and Xaudio2 and loses direct access to hardware in Windows Vista. Indeed, Vista's new sound stack introduces a new API called WASAPI, to which DirectSound functions have been redirected. The DirectPlay Library DPLAY.dll it also disappeared and was replaced by a library named dplayx.dll .

For compatibility reasons, Windows Vista has several versions of Direct3D installed.:
Direct3D 9 offers the same features as the Direct3D 9 version available for Windows XP. This will be the only version available if the Windows Display Driver model driver has not been installed since Vista, for example, immediately after an update when only the XP Graphics Driver (XPDM) is present.

Direct3D 9Ex (also known as 9.0L or 9.L, L refers to Longhorn, the codename Windows Vista used before its release): This version allows you to take advantage of some of the features that have appeared thanks to the use of WDDM drivers, and now it is compatible with applications written for Direct3D 9. The Windows Aero interface is based on D3D 9Ex and uses some features missing from Direct3D 9, such as the ability to share DirectX surfaces between multiple processes.

Direct3D 10 : Designed to provide the most direct and complete access to modern graphics cards through the new model WDDM driver. This version contains a large number of new features, such as the ability to use the HLSL language in Shader Model 4.

Direct3D 10.1 is a small update of Direct3D 10 that is distributed and requires Windows Vista Service Pack 1. This version adds some additional features that allow developers to better control the quality of the resulting image. This version has its own requirements and requires Shader Model 4.1 support for 32-bit floating point operations.

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