# CullPrimitiveEXT(3) Manual Page

## Name

CullPrimitiveEXT - Application-specified culling state per primitive

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## Description

`CullPrimitiveEXT`

  Decorating a variable with the `CullPrimitiveEXT` built-in decoration will make that variable contain the culling state of output primitives. If the per-primitive boolean value is `true`, the primitive will be culled, if it is `false` it will not be culled.

Valid Usage

- VUID-CullPrimitiveEXT-CullPrimitiveEXT-07034
  The `CullPrimitiveEXT` decoration must be used only within the `MeshEXT` `Execution` `Model`

- VUID-CullPrimitiveEXT-CullPrimitiveEXT-07035
  The variable decorated with `CullPrimitiveEXT` must be declared using the `Output` `Storage` `Class`

- VUID-CullPrimitiveEXT-CullPrimitiveEXT-07036
  `CullPrimitiveEXT` must decorate a scalar boolean member of a structure decorated as `Block`, or decorate a variable of type `OpTypeArray` of boolean values

- VUID-CullPrimitiveEXT-CullPrimitiveEXT-10589
  If `CullPrimitiveEXT` is declared as an array of boolean values, the size of the array must match the value specified by `OutputPrimitivesEXT`

- VUID-CullPrimitiveEXT-CullPrimitiveEXT-10590
  If `CullPrimitiveEXT` decorates a member of a structure, the variable declaration of the containing `Block` type must have an array size that matches the value specified by `OutputPrimitivesEXT`

- VUID-CullPrimitiveEXT-CullPrimitiveEXT-10591
  There must be only one declaration of the `CullPrimitiveEXT` associated with a entry point’s interface

- VUID-CullPrimitiveEXT-CullPrimitiveEXT-07038
  The variable decorated with `CullPrimitiveEXT` within the `MeshEXT` `Execution` `Model` must also be decorated with the `PerPrimitiveEXT` decoration

## 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