Fix vsync-off support for direct3d11 #13767
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This PR fixes vsync-off support for direct3d11 by adding the appropriate swap chain and present flags, similar to direct3d12.
Description
There are details about the flags here, under the
DXGI_PRESENT_ALLOW_TEARINGsection. These flags are also a requirement for VRR displays.This is easy to check by running
testspritewith an overlay like PresentMon, and then observing the framerate. Before this PR, the framerate was limited to the monitor's refresh rate. This resulted in significant input latency which is now reduced in vsync-off / high framerate conditions (measured with a hardware latency analyzer).The
CheckFeatureSupportmethod wasn't added untildxgi1_5.h, so an additional check is made for this header, falling back to the previous vsync-off behavior if onlydxgi1_4.his available.Existing Issue(s)
None.