# InvocationsPerPixelNV(3) Manual Page

## Name

InvocationsPerPixelNV - Number of fragment shader invocations for the current pixel

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## Description

`InvocationsPerPixelNV`

  Decorating a variable with the `InvocationsPerPixelNV` built-in decoration will make that variable contain the maximum number of fragment shader invocations per pixel, as derived from the effective shading rate for the fragment. If a primitive does not fully cover a pixel, the number of fragment shader invocations for that pixel may be less than the value of `InvocationsPerPixelNV`. If the shading rate indicates a fragment covering multiple pixels, then `InvocationsPerPixelNV` will be one.

Valid Usage

- VUID-InvocationsPerPixelNV-InvocationsPerPixelNV-04260
  The `InvocationsPerPixelNV` decoration must be used only within the `Fragment` `Execution` `Model`

- VUID-InvocationsPerPixelNV-InvocationsPerPixelNV-04261
  The variable decorated with `InvocationsPerPixelNV` must be declared using the `Input` `Storage` `Class`

- VUID-InvocationsPerPixelNV-InvocationsPerPixelNV-04262
  The variable decorated with `InvocationsPerPixelNV` 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