PointSize(3)

# PointSize(3) Manual Page

## Name

PointSize - Size of a point primitive

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## Description

`PointSize`

  Decorating a variable with the `PointSize` built-in decoration will make that variable contain the size of point primitives or the final rasterization of polygons if polygon mode is VK_POLYGON_MODE_POINT when `VkPhysicalDeviceMaintenance5Properties`::`polygonModePointSize` is set to VK_TRUE . The value written to the variable decorated with `PointSize` by the last pre-rasterization shader stage in the pipeline is used as the framebuffer-space size of points produced by rasterization. If the `maintenance5` feature is enabled and a value is not written to a variable decorated with `PointSize`, a value of 1.0 is used as the size of points.

Note | When `PointSize` decorates a variable in the `Input` `Storage` `Class`, it contains the data written to the output variable decorated with `PointSize` from the previous shader stage.

Valid Usage

- VUID-PointSize-PointSize-04314
  The `PointSize` decoration must be used only within the `MeshEXT`, `MeshNV`, `Vertex`, `TessellationControl`, `TessellationEvaluation`, or `Geometry` `Execution` `Model`

- VUID-PointSize-PointSize-04315
  The variable decorated with `PointSize` within the `MeshEXT`, `MeshNV`, or `Vertex` `Execution` `Model` must be declared using the `Output` `Storage` `Class`

- VUID-PointSize-PointSize-04316
  The variable decorated with `PointSize` within the `TessellationControl`, `TessellationEvaluation`, or `Geometry` `Execution` `Model` must not be declared using a `Storage` `Class` other than `Input` or `Output`

- VUID-PointSize-PointSize-04317
  The variable decorated with `PointSize` must be declared as a scalar 32-bit floating-point 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