---
title: kCVOpenGLTextureCacheChromaSamplingModeKey
framework: Core Video
role: symbol
role_heading: Global Variable
platforms: [macOS 10.4+]
path: corevideo/kcvopengltexturecachechromasamplingmodekey
---

# kCVOpenGLTextureCacheChromaSamplingModeKey

The key used to define the cache’s requested chroma sampling mode.

## Declaration

```swift
let kCVOpenGLTextureCacheChromaSamplingModeKey: CFString
```