Description

SubgroupLocalInvocationId

Decorating a variable with the SubgroupLocalInvocationId builtin decoration will make that variable contain the index of the invocation within the subgroup. This variable is in range [0,SubgroupSize-1].

Note

There is no direct relationship between SubgroupLocalInvocationId and LocalInvocationId or LocalInvocationIndex. If the shader was created with full subgroups, applications can compute their own local invocation index to serve the same purpose:

index = SubgroupLocalInvocationId + SubgroupId × SubgroupSize

If full subgroups are not enabled, some subgroups may be dispatched with inactive invocations that do not correspond to a local workgroup invocation, making the value of index unreliable.
Valid Usage

  • VUID-SubgroupLocalInvocationId-SubgroupLocalInvocationId-04380
    The variable decorated with SubgroupLocalInvocationId must be declared using the Input Storage Class

  • VUID-SubgroupLocalInvocationId-SubgroupLocalInvocationId-04381
    The variable decorated with SubgroupLocalInvocationId 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 2014-2026 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0