---
title: isAlphaToCoverageEnabled
framework: metal
role: symbol
role_heading: Instance Property
path: metal/mtlrenderpipelinedescriptor/isalphatocoverageenabled
---

# isAlphaToCoverageEnabled

A Boolean value that indicates whether to read and use the alpha channel fragment output for color attachments to compute a sample coverage mask.

## Declaration

```swift
var isAlphaToCoverageEnabled: Bool { get set }
```

## Discussion

Discussion The default value is false.

## See Also

### Specifying rasterization and visibility state

- [isAlphaToOneEnabled](metal/mtlrenderpipelinedescriptor/isalphatooneenabled.md)
- [isRasterizationEnabled](metal/mtlrenderpipelinedescriptor/israsterizationenabled.md)
- [inputPrimitiveTopology](metal/mtlrenderpipelinedescriptor/inputprimitivetopology.md)
- [rasterSampleCount](metal/mtlrenderpipelinedescriptor/rastersamplecount.md)
- [MTLPrimitiveTopologyClass](metal/mtlprimitivetopologyclass.md)
- [sampleCount](metal/mtlrenderpipelinedescriptor/samplecount.md)