---
title: MTLTextureSwizzle.alpha
framework: metal
role: symbol
role_heading: Case
path: metal/mtltextureswizzle/alpha
---

# MTLTextureSwizzle.alpha

The alpha channel of the source pixel is copied to the destination channel.

## Declaration

```swift
case alpha
```

## See Also

### Specifying swizzle channels

- [MTLTextureSwizzle.blue](metal/mtltextureswizzle/blue.md)
- [MTLTextureSwizzle.green](metal/mtltextureswizzle/green.md)
- [MTLTextureSwizzle.red](metal/mtltextureswizzle/red.md)
- [MTLTextureSwizzle.one](metal/mtltextureswizzle/one.md)
- [MTLTextureSwizzle.zero](metal/mtltextureswizzle/zero.md)