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# setBuffer(_:offset:index:)

Encodes a reference to a buffer into the argument buffer.

```
func setBuffer(_ buffer: (any MTLBuffer)?, offset: Int, index: Int)
```

## Parameters

`buffer`

A buffer the method encodes.

`offset`

A byte offset for `buffer`.

`index`

The index of a buffer within the argument buffer.
The value corresponds to either the index ID of a declaration in
Metal Shading Language (MSL) or the [`index`](/documentation/Metal/MTLArgumentDescriptor/index) property of
an [`MTLArgumentDescriptor`](/documentation/Metal/MTLArgumentDescriptor) instance.

## Discussion

---

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