# PrimitiveTriangleIndicesEXT(3) Manual Page

## Name

PrimitiveTriangleIndicesEXT - Indices of triangle primitives in a mesh shader

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## Description

`PrimitiveTriangleIndicesEXT`

  Decorating a variable with the `PrimitiveTriangleIndicesEXT` decoration will make that variable contain the output array of vertex index values for triangle primitives.

Valid Usage

- VUID-PrimitiveTriangleIndicesEXT-PrimitiveTriangleIndicesEXT-07053
  The `PrimitiveTriangleIndicesEXT` decoration must be used only within the `MeshEXT` `Execution` `Model`

- VUID-PrimitiveTriangleIndicesEXT-PrimitiveTriangleIndicesEXT-07054
  The `PrimitiveTriangleIndicesEXT` decoration must be used with the `OutputTrianglesEXT` `Execution` `Mode`

- VUID-PrimitiveTriangleIndicesEXT-PrimitiveTriangleIndicesEXT-07055
  The variable decorated with `PrimitiveTriangleIndicesEXT` must be declared using the `Output` `Storage` `Class`

- VUID-PrimitiveTriangleIndicesEXT-PrimitiveTriangleIndicesEXT-07056
  The variable decorated with `PrimitiveTriangleIndicesEXT` must be declared as an array of three component vector 32-bit integer values

- VUID-PrimitiveTriangleIndicesEXT-PrimitiveTriangleIndicesEXT-07057
  All index values of the array decorated with `PrimitiveTriangleIndicesEXT` must be in the range [0, N-1], where N is the value specified by the `OutputVertices` `Execution` `Mode`

- VUID-PrimitiveTriangleIndicesEXT-PrimitiveTriangleIndicesEXT-07058
  The size of the array decorated with `PrimitiveTriangleIndicesEXT` must match the value specified by `OutputPrimitivesEXT`

## 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