# CoreIDARM(3) Manual Page

## Name

CoreIDARM - Core ID on which a shader invocation is running

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## Description

`CoreIDARM`

  Decorating a variable with the `CoreIDARM` built-in decoration will make that variable contain the ID of the core on which the current shader invocation is running. This variable is in the range [0, `CoreMaxIDARM`].

Valid Usage

- VUID-CoreIDARM-CoreIDARM-07599
  The variable decorated with `CoreIDARM` must be declared using the `Input` `Storage` `Class`

- VUID-CoreIDARM-CoreIDARM-07600
  The variable decorated with `CoreIDARM` 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