# DeviceIndex(3) Manual Page

## Name

DeviceIndex - Index of the device executing the shader

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## Description

`DeviceIndex`

  The `DeviceIndex` decoration can be applied to a shader input which will be filled with the device index of the physical device that is executing the current shader invocation. This value will be in the range [0,ma x(1,p h ys i c a l De v i ce C o u n t)), where physicalDeviceCount is the `physicalDeviceCount` member of VkDeviceGroupDeviceCreateInfo.

Valid Usage

- VUID-DeviceIndex-DeviceIndex-04205
  The variable decorated with `DeviceIndex` must be declared using the `Input` `Storage` `Class`

- VUID-DeviceIndex-DeviceIndex-04206
  The variable decorated with `DeviceIndex` must be declared as a scalar 32-bit integer value

## See Also

No cross-references are available

## 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 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0