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# CVOpenGLBufferAttach(_:_:_:_:_:)

Attaches an OpenGL context to a Core Video OpenGL buffer.

```
func CVOpenGLBufferAttach(_ openGLBuffer: CVOpenGLBuffer, _ cglContext: CGLContextObj, _ face: GLenum, _ level: GLint, _ screen: GLint) -> CVReturn
```

## Parameters

`openGLBuffer`

The buffer you want to attach an OpenGL context to.

`cglContext`

The OpenGL context you want to attach.

`face`

The OpenGL face enumeration (`0` for non-cube maps.)

`level`

The mipmap level for drawing in the OpenGL context. This value cannot exceed the maximum mipmap level for this buffer.

`screen`

The virtual screen number you want to use for this context.

## Return Value

A Core Video result code. See [Core Video Constants](/documentation/CoreVideo/core-video-constants) for possible values.

## See Also

  [Core Video Programming Guide](https://developer.apple.com/library/archive/documentation/GraphicsImaging/Conceptual/CoreVideo/CVProg_Intro/CVProg_Intro.html#//apple_ref/doc/uid/TP40001536)


---

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