Description

PatchVertices

Decorating a variable with the PatchVertices built-in decoration will make that variable contain the number of vertices in the input patch being processed by the shader. In a Tessellation Control Shader, this is the same as the name:patchControlPoints member of VkPipelineTessellationStateCreateInfo. In a Tessellation Evaluation Shader, PatchVertices is equal to the tessellation control output patch size. When the same shader is used in different pipelines where the patch sizes are configured differently, the value of the PatchVertices variable will also differ.

Valid Usage

  • VUID-PatchVertices-PatchVertices-04308
    The PatchVertices decoration must be used only within the TessellationControl or TessellationEvaluation Execution Model

  • VUID-PatchVertices-PatchVertices-04309
    The variable decorated with PatchVertices must be declared using the Input Storage Class

  • VUID-PatchVertices-PatchVertices-04310
    The variable decorated with PatchVertices 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 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0