---
layout: stdlib-reference
---

# clockARB

## Description





## Signature 

<pre>
uint64_t <a href="clockarb-567.html">clockARB</a>();

</pre>

## Availability and Requirements

Defined for the following targets:

#### glsl
Available in all stages.

#### spirv
Available in all stages.

Requires capability: `spvShaderClockKHR`.