---
title: sourceAlphaBlendFactor
framework: metal
role: symbol
role_heading: Instance Property
path: metal/mtlrenderpipelinecolorattachmentdescriptor/sourcealphablendfactor
---

# sourceAlphaBlendFactor

The source blend factor (SBF) used by the alpha blend operation.

## Declaration

```swift
var sourceAlphaBlendFactor: MTLBlendFactor { get set }
```

## Discussion

Discussion The default value is MTLBlendFactor.one.

## See Also

### Configuring blend factors

- [destinationAlphaBlendFactor](metal/mtlrenderpipelinecolorattachmentdescriptor/destinationalphablendfactor.md)
- [destinationRGBBlendFactor](metal/mtlrenderpipelinecolorattachmentdescriptor/destinationrgbblendfactor.md)
- [sourceRGBBlendFactor](metal/mtlrenderpipelinecolorattachmentdescriptor/sourcergbblendfactor.md)
- [MTLBlendFactor](metal/mtlblendfactor.md)