![]() The Windows Aero user interface relies on D3D 9Ex. * Direct3D 9Ex (previously known as 9.0L): allows full access to the new capabilities of WDDM (if WDDM drivers are installed, of course) while maintaining compatibility for existing Direct3D applications by putting it in a separate API. This is the only API available if there are only XP graphic drivers (XPDM) installed, after an upgrade to Vista for example. ![]() All the details and advantages of Vista's Windows Display Driver Model are hidden from the application if WDDM drivers are installed. * Direct3D 9: this API emulates all Direct3D 9 on Windows XP behavior (and its quirks) in order to achieve full compatibility with older applications. ![]() In order to achieve backwards compatibility with previous versions of Direct3D, DirectX 10 actually contains three versions of Direct3D: By using the new Windows Display Driver Model, Shader Model 4 and new, more strict requirements for GPU manufacturers to claim Direct3D 10 compatibility, version 10 of Direct3D represents a radical departure from the practices of previous versions and thus breaks backwards compatibility. A major new feature of DirectX 10 is Direct3D 10 (originally called Windows Graphics Foundation).
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