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in wddm 2.1, the capability to retrieve a list of physical display devices was introduced. this feature is used to allow applications to know which display device a game bar is bound to, enabling the application to have some control over the placement and movement of the game bar.wddm 2.1 drivers support a feature called present batching, which adds multi-threading support for flip model swapchains. this is an essential feature that ensures that full screen games with game bar run at the same level of performance as on earlier versions of windows.in wddm 2.1, the capability to retrieve start of graphics events timestamps in the gpu pipeline was introduced. this feature, used in conjunction with the end of pipeline timestamps, provides developers with a clear and fine-grained visualization of the parallelization, pipelining, and timing of their applications activities occurring on the gpu. provided with the execution time of each event, developers can further optimize their code and investigate inefficiencies and other performance issues.display driver model (ddm) 1.0 was released on july 10, 2008 as the first version of wddm. this version included the following functionality: user mode direct rendering of windows compositing window manager that displayed the desktop device independent interface support for secondary monitors private mode support display driver model (ddm) 1.1 was released on july 13, 2010, and was the first version of the wddm specification that was publicly available. this version included the following functionality: better device management a new direct3d runtime improved performance and security windows streaming multimedia (wm) extensions enhanced support for secondary monitors support for high refresh rate monitors support for multiple displays support for new monitor formats
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