code: func (d Device) MakeBufferWithBytes(bytes unsafe.Pointer, length uintptr, opt ResourceOptions) Buffer {
  	return Buffer{C.Device_MakeBufferWithBytes(d.device, bytes, C.size_t(length), C.uint16_t(opt))}
  }
docs: // MakeBufferWithBytes allocates a new buffer of a given length
  // and initializes its contents by copying existing data into it.
  //
  // Reference: https://developer.apple.com/documentation/metal/mtldevice/1433429-makebuffer.