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> Unreal Engine API Reference > Runtime > HeadMountedDisplay > IHeadMountedDisplayModule > IHeadMountedDisplayModule::GetGraphicsAdapterLuid

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IHeadMountedDisplayModule::GetGraphicsAdapterLuid

Get LUID of graphics adapter where the HMD was last connected.

Windows

MacOS

Linux

References

Module	HeadMountedDisplay
Header	/Engine/Source/Runtime/HeadMountedDisplay/Public/IHeadMountedDisplayModule.h
Include	#include "IHeadMountedDisplayModule.h"

Syntax

virtual uint64 GetGraphicsAdapterLuid()

Remarks

Get LUID of graphics adapter where the HMD was last connected.

currently, for mac, GetGraphicsAdapterLuid() is used to return a device index (how the function "GetGraphicsAdapter" used to work), not a ID... eventually we want the HMD module to return the MTLDevice's registryID, but we cannot fully handle that until we drop support for 10.12 NOTE: this is why we use -1 as a sentinel value representing "no device" (instead of 0, which is used in the LUID case)

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