# VkPhysicalDeviceIDProperties(3) Manual Page

## Name

VkPhysicalDeviceIDProperties - Structure specifying IDs related to the physical device

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## C Specification

The `VkPhysicalDeviceIDProperties` structure is defined as:

    // Provided by VK_VERSION_1_1
    typedef struct VkPhysicalDeviceIDProperties {
        VkStructureType    sType;
        void*              pNext;
        uint8_t            deviceUUID[VK_UUID_SIZE];
        uint8_t            driverUUID[VK_UUID_SIZE];
        uint8_t            deviceLUID[VK_LUID_SIZE];
        uint32_t           deviceNodeMask;
        VkBool32           deviceLUIDValid;
    } VkPhysicalDeviceIDProperties;

or the equivalent

    // Provided by VK_KHR_external_fence_capabilities, VK_KHR_external_memory_capabilities, VK_KHR_external_semaphore_capabilities
    typedef VkPhysicalDeviceIDProperties VkPhysicalDeviceIDPropertiesKHR;

## Members

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

## Description

- `deviceUUID` is an array of `VK_UUID_SIZE` `uint8_t` values representing a universally unique identifier for the device.

- `driverUUID` is an array of `VK_UUID_SIZE` `uint8_t` values representing a universally unique identifier for the driver build in use by the device.

- `deviceLUID` is an array of `VK_LUID_SIZE` `uint8_t` values representing a locally unique identifier for the device.

- `deviceNodeMask` is a `uint32_t` bitfield identifying the node within a linked device adapter corresponding to the device.

- `deviceLUIDValid` is a boolean value that will be `VK_TRUE` if `deviceLUID` contains a valid LUID and `deviceNodeMask` contains a valid node mask, and `VK_FALSE` if they do not.

If the `VkPhysicalDeviceIDProperties` structure is included in the `pNext` chain of the VkPhysicalDeviceProperties2 structure passed to vkGetPhysicalDeviceProperties2, it is filled in with each corresponding implementation-dependent property.

`deviceUUID` must be immutable for a given device across instances, processes, driver APIs, driver versions, and system reboots.

Applications can compare the `driverUUID` value across instance and process boundaries, and can make similar queries in external APIs to determine whether they are capable of sharing memory objects and resources using them with the device.

`deviceUUID` and/or `driverUUID` must be used to determine whether a particular external object can be shared between driver components, where such a restriction exists as defined in the compatibility table for the particular object type:

- External memory handle types compatibility

- External semaphore handle types compatibility

- External fence handle types compatibility

If `deviceLUIDValid` is `VK_FALSE`, the values of `deviceLUID` and `deviceNodeMask` are undefined. If `deviceLUIDValid` is `VK_TRUE` and Vulkan is running on the Windows operating system, the contents of `deviceLUID` can be cast to an `LUID` object and must be equal to the locally unique identifier of a `IDXGIAdapter1` object that corresponds to `physicalDevice`. If `deviceLUIDValid` is `VK_TRUE`, `deviceNodeMask` must contain exactly one bit. If Vulkan is running on an operating system that supports the Direct3D 12 API and `physicalDevice` corresponds to an individual device in a linked device adapter, `deviceNodeMask` identifies the Direct3D 12 node corresponding to `physicalDevice`. Otherwise, `deviceNodeMask` must be `1`.

Note | Although they have identical descriptions, VkPhysicalDeviceIDProperties::`deviceUUID` may differ from VkPhysicalDeviceProperties2::`pipelineCacheUUID`. The former is intended to identify and correlate devices across API and driver boundaries, while the latter is used to identify a compatible device and driver combination to use when serializing and de-serializing pipeline state. Implementations should return `deviceUUID` values which are likely to be unique even in the presence of multiple Vulkan implementations (such as a GPU driver and a software renderer; two drivers for different GPUs; or the same Vulkan driver running on two logically different devices). Khronos' conformance testing is unable to guarantee that `deviceUUID` values are actually unique, so implementors should make their own best efforts to ensure this. In particular, hard-coded `deviceUUID` values, especially all-`0` bits, should never be used. A combination of values unique to the vendor, the driver, and the hardware environment can be used to provide a `deviceUUID` which is unique to a high degree of certainty. Some possible inputs to such a computation are: Information reported by vkGetPhysicalDeviceProperties PCI device ID (if defined) PCI bus ID, or similar system configuration information. Driver binary checksums.

Note | While VkPhysicalDeviceIDProperties::`deviceUUID` is specified to remain consistent across driver versions and system reboots, it is not intended to be usable as a serializable persistent identifier for a device. It may change when a device is physically added to, removed from, or moved to a different connector in a system while that system is powered down. Further, there is no reasonable way to verify with conformance testing that a given device retains the same UUID in a given system across all driver versions supported in that system. While implementations should make every effort to report consistent device UUIDs across driver versions, applications should avoid relying on the persistence of this value for uses other than identifying compatible devices for external object sharing purposes.

Valid Usage (Implicit)

- VUID-VkPhysicalDeviceIDProperties-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_ID_PROPERTIES`

## See Also

VK_VERSION_1_1, VkBool32, VkStructureType

## Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0