# buffers The buffer mutability options to apply to the next kernel call. ``` var buffers: MTLPipelineBufferDescriptorArray { get } ``` ## Discussion This property holds an array of [`MTLPipelineBufferDescriptor`](/documentation/Metal/MTLPipelineBufferDescriptor) instances, where each index corresponds to the same entry in the buffer argument table. Metal can perform additional optimizations if you guarantee that neither the CPU nor the GPU modify a buffer’s contents after set in a function’s argument table and before its command buffer completes. Use immutable buffers as much as possible, for either regular buffers or argument buffers. ```objective-c // Compute setup. // Set mutability for buffer at index 9. MTLComputePipelineDescriptor *computeDescriptor = [MTLComputePipelineDescriptor new]; computeDescriptor.buffers[9].mutability = MTLMutabilityImmutable; // Compute pass. // Set immutable buffer at index 9. id computeEncoder = [_commandBuffer computeCommandEncoder]; [computeEncoder setBuffer:_buffer offset:0 atIndex:9]; ``` --- 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)