---
title: "setVertexBuffer(_:offset:index:)"
framework: metal
role: symbol
role_heading: Instance Method
path: "metal/mtlrendercommandencoder/setvertexbuffer(_:offset:index:)"
---

# setVertexBuffer(_:offset:index:)

Assigns a buffer to an entry in the vertex shader argument table.

## Declaration

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

## Parameters

- `buffer`: An doc://com.apple.metal/documentation/Metal/MTLBuffer instance the command assigns to an entry in the vertex shader argument table for buffers.
- `offset`: An integer that represents the location, in bytes, from the start of buffer where the vertex shader argument data begins. See the https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf to check for offset alignment requirements for buffers in device and constant address space.
- `index`: An integer that represents the entry in the vertex shader argument table for buffers that stores a record of buffer and offset.

## Mentioned in

Improving CPU performance by using argument buffers

## Discussion

Discussion By default, the buffer at each index is nil.

## See Also

### Assigning buffers

- [setVertexBuffer(_:offset:attributeStride:index:)](metal/mtlrendercommandencoder/setvertexbuffer(_:offset:attributestride:index:).md)
- [setVertexBuffers(_:offsets:range:)](metal/mtlrendercommandencoder/setvertexbuffers(_:offsets:range:).md)
- [setVertexBuffers(_:offsets:attributeStrides:range:)](metal/mtlrendercommandencoder/setvertexbuffers(_:offsets:attributestrides:range:).md)
- [setVertexBytes(_:length:index:)](metal/mtlrendercommandencoder/setvertexbytes(_:length:index:).md)
- [setVertexBytes(_:length:attributeStride:index:)](metal/mtlrendercommandencoder/setvertexbytes(_:length:attributestride:index:).md)
- [setVertexBufferOffset(_:index:)](metal/mtlrendercommandencoder/setvertexbufferoffset(_:index:).md)
- [setVertexBufferOffset(offset:attributeStride:index:)](metal/mtlrendercommandencoder/setvertexbufferoffset(offset:attributestride:index:).md)