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# MTLStitchedLibraryDescriptor

A description of a new library of procedurally generated functions.

```
class MTLStitchedLibraryDescriptor
```

## Overview

An [`MTLStitchedLibraryDescriptor`](/documentation/Metal/MTLStitchedLibraryDescriptor) describes a library of new stitched functions. A *stitched function* is a visible function you create by composing other Metal shader functions together in a function graph.

Configure a stitched library descriptor by assigning an array of one or more [`MTLFunctionStitchingGraph`](/documentation/Metal/MTLFunctionStitchingGraph) instances, each describing a stitched function, to the [`functionGraphs`](/documentation/Metal/MTLStitchedLibraryDescriptor/functionGraphs) property. Then assign an [`MTLFunction`](/documentation/Metal/MTLFunction) array that includes all the functions the graphs depend on to the [`functions`](/documentation/Metal/MTLStitchedLibraryDescriptor/functions) property.

Create a stitched library from the descriptor by passing it to the [`makeLibrary(stitchedDescriptor:)`](/documentation/Metal/MTLDevice/makeLibrary(stitchedDescriptor:)) method of an [`MTLDevice`](/documentation/Metal/MTLDevice). You can change the descriptor to create other libraries without affecting any existing ones.

## Topics

### Configuring a stitched library

[`functions`](/documentation/Metal/MTLStitchedLibraryDescriptor/functions)

The list of functions for creating the stitched library.

[`functionGraphs`](/documentation/Metal/MTLStitchedLibraryDescriptor/functionGraphs)

The function graphs that define the new stitched library’s functions.


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