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# rasterizationRateMapDescriptorWithScreenSize:layer:

Creates a rate map descriptor with a single rate layer.

```
+ (MTLRasterizationRateMapDescriptor *) rasterizationRateMapDescriptorWithScreenSize:(MTLSize) screenSize layer:(MTLRasterizationRateLayerDescriptor *) layer;
```

## Parameters

`screenSize`

The logical size, in pixels, of the viewport coordinate system.

`layer`

A descriptor for the rate layer to create.

## Return Value

A descriptor object whose [`screenSize`](/documentation/Metal/MTLRasterizationRateMapDescriptor/screenSize) is set to the provided size. Layer 0 in the rate map is set to the provided layer descriptor.

---

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