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i found not much sample programs use IDXGIFactory3, and its function GetCreationFlags, so when to use it?

MiC
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There's really only a single defined creation flag, DXGI_CREATE_FACTORY_DEBUG, so there's not a lot of value in most programs using this method. It's there as a method for someone to determine if the debug version of DXGI is active or not...

See DXGI Debug Device

Chuck Walbourn
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