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layout: stdlib-reference
---

# attribute [patchconstantfunc]

## Description

Used on a hull shader entrypoint to specify the associated function that computes the patch constant data.

## Signature

<pre>
[<a href="patchconstantfunc.html">patchconstantfunc</a>(<a href="patchconstantfunc.html#decl-name" class="code_param">name</a>)]
</pre>

## Parameters

####  <a id="decl-name"></a>name
The name of the function (in string literal) that computes the patch constant data.