C Specification

To set descriptor buffer offsets in a command buffer, call:

// Provided by VK_EXT_descriptor_buffer
void vkCmdSetDescriptorBufferOffsetsEXT(
    VkCommandBuffer                             commandBuffer,
    VkPipelineBindPoint                         pipelineBindPoint,
    VkPipelineLayout                            layout,
    uint32_t                                    firstSet,
    uint32_t                                    setCount,
    const uint32_t*                             pBufferIndices,
    const VkDeviceSize*                         pOffsets);


  • commandBuffer is the command buffer in which the descriptor buffer offsets will be set.

  • pipelineBindPoint is a VkPipelineBindPoint indicating the type of the pipeline that will use the descriptors.

  • layout is a VkPipelineLayout object used to program the bindings.

  • firstSet is the number of the first set to be bound.

  • setCount is the number of elements in the pBufferIndices and pOffsets arrays.

  • pBufferIndices is a pointer to an array of indices into the descriptor buffer binding points set by vkCmdBindDescriptorBuffersEXT.

  • pOffsets is a pointer to an array of VkDeviceSize offsets to apply to the bound descriptor buffers.


vkCmdSetDescriptorBufferOffsetsEXT binds setCount pairs of descriptor buffers, specified by indices into the binding points bound using vkCmdBindDescriptorBuffersEXT, and buffer offsets to set numbers [firstSet..firstSet+descriptorSetCount-1] for subsequent bound pipeline commands set by pipelineBindPoint. Set [firstSet + i] is bound to the descriptor buffer at binding pBufferIndices[i] at an offset of pOffsets[i]. Any bindings that were previously applied via these sets, or calls to vkCmdBindDescriptorSets, are no longer valid. Other sets will also be invalidated upon calling this command if layout differs from the pipeline layout used to bind those other sets, as described in Pipeline Layout Compatibility.

After binding descriptors, applications can modify descriptor memory either by performing writes on the host or with device commands. When descriptor memory is updated with device commands, visibility for the shader stage accessing a descriptor is ensured with the VK_ACCESS_2_DESCRIPTOR_BUFFER_READ_BIT_EXT access flag. Implementations must not access resources referenced by these descriptors unless they are dynamically accessed by shaders. Descriptors bound with this call can be undefined if they are not dynamically accessed by shaders.

Implementations may read descriptor data for any statically accessed descriptor if the binding in layout is not declared with the VK_DESCRIPTOR_BINDING_VARIABLE_DESCRIPTOR_COUNT_BIT flag. If the binding in layout is declared with VK_DESCRIPTOR_BINDING_VARIABLE_DESCRIPTOR_COUNT_BIT, implementations must not read descriptor data that is not dynamically accessed.

Applications must ensure that any descriptor which the implementation may read must be in-bounds of the underlying descriptor buffer binding.


Applications can freely decide how large a variable descriptor buffer binding is, so it may not be safe to read such descriptor payloads statically. The intention of these rules is to allow implementations to speculatively prefetch descriptor payloads where feasible.

Dynamically accessing a resource through descriptor data from an unbound region of a sparse partially-resident buffer will result in invalid descriptor data being read, and therefore undefined behavior.


For descriptors written by the host, visibility is implied through the automatic visibility operation on queue submit, and there is no need to consider VK_ACCESS_2_DESCRIPTOR_BUFFER_READ_BIT. Explicit synchronization for descriptors is only required when descriptors are updated on the device.


The requirements above imply that all descriptor bindings have been defined with the equivalent of VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT, VK_DESCRIPTOR_BINDING_UPDATE_UNUSED_WHILE_PENDING_BIT and VK_DESCRIPTOR_BINDING_PARTIALLY_BOUND_BIT, but enabling those features is not required to get this behavior.

Valid Usage
  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-None-08060
    The descriptorBuffer feature must be enabled

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-pOffsets-08061
    The offsets in pOffsets must be aligned to VkPhysicalDeviceDescriptorBufferPropertiesEXT::descriptorBufferOffsetAlignment

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-pOffsets-08063
    The offsets in pOffsets must be small enough such that any descriptor binding referenced by layout without the VK_DESCRIPTOR_BINDING_VARIABLE_DESCRIPTOR_COUNT_BIT flag computes a valid address inside the underlying VkBuffer

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-pOffsets-08126
    The offsets in pOffsets must be small enough such that any location accessed by a shader as a sampler descriptor must be within VkPhysicalDeviceDescriptorBufferPropertiesEXT::maxSamplerDescriptorBufferRange of the sampler descriptor buffer binding

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-pOffsets-08127
    The offsets in pOffsets must be small enough such that any location accessed by a shader as a resource descriptor must be within VkPhysicalDeviceDescriptorBufferPropertiesEXT::maxResourceDescriptorBufferRange of the resource descriptor buffer binding

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-pBufferIndices-08064
    Each element of pBufferIndices must be less than VkPhysicalDeviceDescriptorBufferPropertiesEXT::maxDescriptorBufferBindings

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-pBufferIndices-08065
    Each element of pBufferIndices must reference a valid descriptor buffer binding set by a previous call to vkCmdBindDescriptorBuffersEXT in commandBuffer

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-firstSet-08066
    The sum of firstSet and setCount must be less than or equal to VkPipelineLayoutCreateInfo::setLayoutCount provided when layout was created

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-pipelineBindPoint-08067
    pipelineBindPoint must be supported by the commandBuffer’s parent VkCommandPool’s queue family

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-firstSet-09006
    The VkDescriptorSetLayout for each set from firstSet to firstSet + setCount when layout was created must have been created with the VK_DESCRIPTOR_SET_LAYOUT_CREATE_DESCRIPTOR_BUFFER_BIT_EXT bit set

Valid Usage (Implicit)
  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-commandBuffer-parameter
    commandBuffer must be a valid VkCommandBuffer handle

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-pipelineBindPoint-parameter
    pipelineBindPoint must be a valid VkPipelineBindPoint value

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-layout-parameter
    layout must be a valid VkPipelineLayout handle

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-pBufferIndices-parameter
    pBufferIndices must be a valid pointer to an array of setCount uint32_t values

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-pOffsets-parameter
    pOffsets must be a valid pointer to an array of setCount VkDeviceSize values

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-commandBuffer-recording
    commandBuffer must be in the recording state

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-commandBuffer-cmdpool
    The VkCommandPool that commandBuffer was allocated from must support graphics, or compute operations

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-videocoding
    This command must only be called outside of a video coding scope

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-setCount-arraylength
    setCount must be greater than 0

  • VUID-vkCmdSetDescriptorBufferOffsetsEXT-commonparent
    Both of commandBuffer, and layout must have been created, allocated, or retrieved from the same VkDevice

Host Synchronization
  • Host access to commandBuffer must be externally synchronized

  • Host access to the VkCommandPool that commandBuffer was allocated from must be externally synchronized

Command Properties
Command Buffer Levels Render Pass Scope Video Coding Scope Supported Queue Types Command Type






See Also

Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

Copyright 2014-2023 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0