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# MPSPurgeableState

The purgeable state of an image’s underlying texture.

```
enum MPSPurgeableState
```

## Topics

### Constants

[`MPSPurgeableState.allocationDeferred`](/documentation/MetalPerformanceShaders/MPSPurgeableState/allocationDeferred)

The image’s underlying texture hasn’t been allocated yet. Attempts to set another purgeable state using the [`setPurgeableState(_:)`](/documentation/MetalPerformanceShaders/MPSImage/setPurgeableState(_:)) method will be ignored.

[`MPSPurgeableState.keepCurrent`](/documentation/MetalPerformanceShaders/MPSPurgeableState/keepCurrent)

The current state is queried but doesn’t change.

[`MPSPurgeableState.nonVolatile`](/documentation/MetalPerformanceShaders/MPSPurgeableState/nonVolatile)

The contents of the resource aren’t allowed to be discarded.

[`MPSPurgeableState.volatile`](/documentation/MetalPerformanceShaders/MPSPurgeableState/volatile)

The system is allowed to discard the resource to free up memory.

[`MPSPurgeableState.empty`](/documentation/MetalPerformanceShaders/MPSPurgeableState/empty)

The contents of the resource are or will be discarded.


---

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