# PositionPerViewNV(3) Manual Page

## Name

PositionPerViewNV - Vertex position per view

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## Description

`PositionPerViewNV`

  Decorating a variable with the `PositionPerViewNV` built-in decoration will make that variable contain the position of the current vertex, for each view.

  Elements of the array correspond to views in a multiview subpass, and those elements corresponding to views in the view mask of the subpass the shader is compiled against will be used as the position value for those views. For the final pre-rasterization shader stage in the pipeline, values written to an output variable decorated with `PositionPerViewNV` are used in subsequent primitive assembly, clipping, and rasterization operations, as with `Position`. `PositionPerViewNV` output in an earlier pre-rasterization shader stage is available as an input in the subsequent pre-rasterization shader stage.

  If a shader is compiled against a subpass that has the `VK_SUBPASS_DESCRIPTION_PER_VIEW_POSITION_X_ONLY_BIT_NVX` bit set, then the position values for each view must not differ in any component other than the X component. If the values do differ, one will be chosen in an implementation-dependent manner.

Valid Usage

- VUID-PositionPerViewNV-PositionPerViewNV-04322
  The `PositionPerViewNV` decoration must be used only within the `MeshNV`, `Vertex`, `TessellationControl`, `TessellationEvaluation`, or `Geometry` `Execution` `Model`

- VUID-PositionPerViewNV-PositionPerViewNV-04323
  The variable decorated with `PositionPerViewNV` within the `Vertex`, or `MeshNV` `Execution` `Model` must be declared using the `Output` `Storage` `Class`

- VUID-PositionPerViewNV-PositionPerViewNV-04324
  The variable decorated with `PositionPerViewNV` within the `TessellationControl`, `TessellationEvaluation`, or `Geometry` `Execution` `Model` must not be declared using a `Storage` `Class` other than `Input` or `Output`

- VUID-PositionPerViewNV-PositionPerViewNV-04325
  The variable decorated with `PositionPerViewNV` must be declared as an array of four-component vector of 32-bit floating-point values with at least as many elements as the maximum view in the subpass’s view mask plus one

- VUID-PositionPerViewNV-PositionPerViewNV-04326
  The array variable decorated with `PositionPerViewNV` must only be indexed by a constant or specialization constant

## 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