# copyIndirectCommandBuffer(_:sourceRange:destination:destinationIndex:) Encodes a command that copies commands from one indirect command buffer into another. ``` func copyIndirectCommandBuffer(_ buffer: any MTLIndirectCommandBuffer, sourceRange: Range, destination: any MTLIndirectCommandBuffer, destinationIndex: Int) ``` ## Parameters `buffer` An indirect command buffer the command copies from. `sourceRange` The range of commands in the source buffer to copy. The source range needs to start on a valid execution point. `destination` Another indirect command buffer the command copies to. `destinationIndex` An index in `destination` where the command copies content from `source` to. The destination index needs to be a valid execution point with enough remaining space in `destination` to accommodate `sourceRange.count` indexes. ## Discussion You can copy commands from one indirect command buffer to another, but only a compatible one. You can create compatible indirect command buffers by passing [`MTLIndirectCommandBufferDescriptor`](/documentation/Metal/MTLIndirectCommandBufferDescriptor) instances with the same configuration to the [`makeIndirectCommandBuffer(descriptor:maxCommandCount:options:)`](/documentation/Metal/MTLDevice/makeIndirectCommandBuffer(descriptor:maxCommandCount:options:)) method of [`MTLDevice`](/documentation/Metal/MTLDevice). --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)