# SubgroupId(3) Manual Page

## Name

SubgroupId - Subgroup ID

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## Description

`SubgroupId`

  Decorating a variable with the `SubgroupId` built-in decoration will make that variable contain the index of the subgroup within the local workgroup. This variable is in range [0, `NumSubgroups`-1].

Valid Usage

- VUID-SubgroupId-SubgroupId-04367
  The `SubgroupId` decoration must be used only within the `GLCompute`, `MeshEXT`, `TaskEXT`, `MeshNV`, or `TaskNV` `Execution` `Model`

- VUID-SubgroupId-SubgroupId-04368
  The variable decorated with `SubgroupId` must be declared using the `Input` `Storage` `Class`

- VUID-SubgroupId-SubgroupId-04369
  The variable decorated with `SubgroupId` 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 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0