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# MTLFunctionDescriptor

A description of a function object to create.

```
class MTLFunctionDescriptor
```

## Topics

### Creating a function descriptor

[`functionDescriptor`](/documentation/Metal/MTLFunctionDescriptor/functionDescriptor)

Creates a default function descriptor.

### Specifying the function configuration

[`name`](/documentation/Metal/MTLFunctionDescriptor/name)

The name of the function to fetch from the library.

[`specializedName`](/documentation/Metal/MTLFunctionDescriptor/specializedName)

A new name for the created function object.

[`constantValues`](/documentation/Metal/MTLFunctionDescriptor/constantValues)

The set of constant values assigned to the function constants.

[`options`](/documentation/Metal/MTLFunctionDescriptor/options)

Flags specifying how Metal should create the new function object.

[`binaryArchives`](/documentation/Metal/MTLFunctionDescriptor/binaryArchives)

The binary archives to search for a previously-compiled version of this function.

[`MTLFunctionOptions`](/documentation/Metal/MTLFunctionOptions)

Options that define how Metal compiles a GPU function.

[`MTLLinkedFunctions`](/documentation/Metal/MTLLinkedFunctions)

A set of related functions that Metal links to when necessary to create the function instance.

## See Also

[`makeFunction(descriptor:completionHandler:)`](/documentation/Metal/MTLLibrary/makeFunction(descriptor:completionHandler:))

Asynchronously creates an object representing a shader function, using the specified descriptor.

[`makeFunction(descriptor:)`](/documentation/Metal/MTLLibrary/makeFunction(descriptor:))

Synchronously creates an object representing a shader function, using the specified descriptor.


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