## C Specification

To record a dispatch using non-zero base values for the components of WorkgroupId, call:

// Provided by VK_VERSION_1_1
void vkCmdDispatchBase(
VkCommandBuffer                             commandBuffer,
uint32_t                                    baseGroupX,
uint32_t                                    baseGroupY,
uint32_t                                    baseGroupZ,
uint32_t                                    groupCountX,
uint32_t                                    groupCountY,
uint32_t                                    groupCountZ);

or the equivalent command

// Provided by VK_KHR_device_group
void vkCmdDispatchBaseKHR(
VkCommandBuffer                             commandBuffer,
uint32_t                                    baseGroupX,
uint32_t                                    baseGroupY,
uint32_t                                    baseGroupZ,
uint32_t                                    groupCountX,
uint32_t                                    groupCountY,
uint32_t                                    groupCountZ);

## Parameters

• commandBuffer is the command buffer into which the command will be recorded.

• baseGroupX is the start value for the X component of WorkgroupId.

• baseGroupY is the start value for the Y component of WorkgroupId.

• baseGroupZ is the start value for the Z component of WorkgroupId.

• groupCountX is the number of local workgroups to dispatch in the X dimension.

• groupCountY is the number of local workgroups to dispatch in the Y dimension.

• groupCountZ is the number of local workgroups to dispatch in the Z dimension.

## Description

When the command is executed, a global workgroup consisting of groupCountX × groupCountY × groupCountZ local workgroups is assembled, with WorkgroupId values ranging from [baseGroup*, baseGroup* + groupCount*) in each component. vkCmdDispatch is equivalent to vkCmdDispatchBase(0,0,0,groupCountX,groupCountY,groupCountZ).

Valid Usage
• VUID-vkCmdDispatchBase-magFilter-04553
If a VkSampler created with magFilter or minFilter equal to VK_FILTER_LINEAR and compareEnable equal to VK_FALSE is used to sample a VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT

• VUID-vkCmdDispatchBase-mipmapMode-04770
If a VkSampler created with mipmapMode equal to VK_SAMPLER_MIPMAP_MODE_LINEAR and compareEnable equal to VK_FALSE is used to sample a VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT

• VUID-vkCmdDispatchBase-None-06479
If a VkImageView is sampled with depth comparison, the image view’s format features must contain VK_FORMAT_FEATURE_2_SAMPLED_IMAGE_DEPTH_COMPARISON_BIT

• VUID-vkCmdDispatchBase-None-02691
If a VkImageView is accessed using atomic operations as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_STORAGE_IMAGE_ATOMIC_BIT

• VUID-vkCmdDispatchBase-None-02692
If a VkImageView is sampled with VK_FILTER_CUBIC_EXT as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_CUBIC_BIT_EXT

• VUID-vkCmdDispatchBase-filterCubic-02694
Any VkImageView being sampled with VK_FILTER_CUBIC_EXT as a result of this command must have a VkImageViewType and format that supports cubic filtering, as specified by VkFilterCubicImageViewImageFormatPropertiesEXT::filterCubic returned by vkGetPhysicalDeviceImageFormatProperties2

• VUID-vkCmdDispatchBase-filterCubicMinmax-02695
Any VkImageView being sampled with VK_FILTER_CUBIC_EXT with a reduction mode of either VK_SAMPLER_REDUCTION_MODE_MIN or VK_SAMPLER_REDUCTION_MODE_MAX as a result of this command must have a VkImageViewType and format that supports cubic filtering together with minmax filtering, as specified by VkFilterCubicImageViewImageFormatPropertiesEXT::filterCubicMinmax returned by vkGetPhysicalDeviceImageFormatProperties2

• VUID-vkCmdDispatchBase-flags-02696
Any VkImage created with a VkImageCreateInfo::flags containing VK_IMAGE_CREATE_CORNER_SAMPLED_BIT_NV sampled as a result of this command must only be sampled using a VkSamplerAddressMode of VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE

• VUID-vkCmdDispatchBase-OpTypeImage-07027
For any VkImageView being written as a storage image where the image format field of the OpTypeImage is Unknown, the view’s format features must contain VK_FORMAT_FEATURE_2_STORAGE_WRITE_WITHOUT_FORMAT_BIT

• VUID-vkCmdDispatchBase-OpTypeImage-07028
For any VkImageView being read as a storage image where the image format field of the OpTypeImage is Unknown, the view’s format features must contain VK_FORMAT_FEATURE_2_STORAGE_READ_WITHOUT_FORMAT_BIT

• VUID-vkCmdDispatchBase-OpTypeImage-07029
For any VkBufferView being written as a storage texel buffer where the image format field of the OpTypeImage is Unknown, the view’s buffer features must contain VK_FORMAT_FEATURE_2_STORAGE_WRITE_WITHOUT_FORMAT_BIT

• VUID-vkCmdDispatchBase-OpTypeImage-07030
Any VkBufferView being read as a storage texel buffer where the image format field of the OpTypeImage is Unknown then the view’s buffer features must contain VK_FORMAT_FEATURE_2_STORAGE_READ_WITHOUT_FORMAT_BIT

• VUID-vkCmdDispatchBase-None-02697
For each set n that is statically used by the VkPipeline bound to the pipeline bind point used by this command, a descriptor set must have been bound to n at the same pipeline bind point, with a VkPipelineLayout that is compatible for set n, with the VkPipelineLayout used to create the current VkPipeline, as described in [descriptorsets-compatibility]

• VUID-vkCmdDispatchBase-maintenance4-06425
If the maintenance4 feature is not enabled, then for each push constant that is statically used by the VkPipeline bound to the pipeline bind point used by this command, a push constant value must have been set for the same pipeline bind point, with a VkPipelineLayout that is compatible for push constants, with the VkPipelineLayout used to create the current VkPipeline, as described in [descriptorsets-compatibility]

• VUID-vkCmdDispatchBase-None-02699
Descriptors in each bound descriptor set, specified via vkCmdBindDescriptorSets, must be valid if they are statically used by the VkPipeline bound to the pipeline bind point used by this command

• VUID-vkCmdDispatchBase-None-02700
A valid pipeline must be bound to the pipeline bind point used by this command

• VUID-vkCmdDispatchBase-commandBuffer-02701
If the VkPipeline object bound to the pipeline bind point used by this command requires any dynamic state, that state must have been set or inherited (if the VK_NV_inherited_viewport_scissor extension is enabled) for commandBuffer, and done so after any previously bound pipeline with the corresponding state not specified as dynamic

• VUID-vkCmdDispatchBase-None-02859
There must not have been any calls to dynamic state setting commands for any state not specified as dynamic in the VkPipeline object bound to the pipeline bind point used by this command, since that pipeline was bound

• VUID-vkCmdDispatchBase-None-02702
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used to sample from any VkImage with a VkImageView of the type VK_IMAGE_VIEW_TYPE_3D, VK_IMAGE_VIEW_TYPE_CUBE, VK_IMAGE_VIEW_TYPE_1D_ARRAY, VK_IMAGE_VIEW_TYPE_2D_ARRAY or VK_IMAGE_VIEW_TYPE_CUBE_ARRAY, in any shader stage

• VUID-vkCmdDispatchBase-None-02703
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used with any of the SPIR-V OpImageSample* or OpImageSparseSample* instructions with ImplicitLod, Dref or Proj in their name, in any shader stage

• VUID-vkCmdDispatchBase-None-02704
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used with any of the SPIR-V OpImageSample* or OpImageSparseSample* instructions that includes a LOD bias or any offset values, in any shader stage

• VUID-vkCmdDispatchBase-uniformBuffers-06935
If any stage of the VkPipeline object bound to the pipeline bind point used by this command accesses a uniform buffer, and that stage was created without enabling either VK_PIPELINE_ROBUSTNESS_BUFFER_BEHAVIOR_ROBUST_BUFFER_ACCESS_EXT or VK_PIPELINE_ROBUSTNESS_BUFFER_BEHAVIOR_ROBUST_BUFFER_ACCESS_2_EXT for uniformBuffers, and the robustBufferAccess feature is not enabled, that stage must not access values outside of the range of the buffer as specified in the descriptor set bound to the same pipeline bind point

• VUID-vkCmdDispatchBase-storageBuffers-06936
If any stage of the VkPipeline object bound to the pipeline bind point used by this command accesses a storage buffer, and that stage was created without enabling either VK_PIPELINE_ROBUSTNESS_BUFFER_BEHAVIOR_ROBUST_BUFFER_ACCESS_EXT or VK_PIPELINE_ROBUSTNESS_BUFFER_BEHAVIOR_ROBUST_BUFFER_ACCESS_2_EXT for storageBuffers, and the robustBufferAccess feature is not enabled, that stage must not access values outside of the range of the buffer as specified in the descriptor set bound to the same pipeline bind point

• VUID-vkCmdDispatchBase-commandBuffer-02707
If commandBuffer is an unprotected command buffer and protectedNoFault is not supported, any resource accessed by the VkPipeline object bound to the pipeline bind point used by this command must not be a protected resource

• VUID-vkCmdDispatchBase-None-06550
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler or VkImageView object that enables sampler Y′CBCR conversion, that object must only be used with OpImageSample* or OpImageSparseSample* instructions

• VUID-vkCmdDispatchBase-ConstOffset-06551
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler or VkImageView object that enables sampler Y′CBCR conversion, that object must not use the ConstOffset and Offset operands

• VUID-vkCmdDispatchBase-None-04115
If a VkImageView is accessed using OpImageWrite as a result of this command, then the Type of the Texel operand of that instruction must have at least as many components as the image view’s format

• VUID-vkCmdDispatchBase-OpImageWrite-04469
If a VkBufferView is accessed using OpImageWrite as a result of this command, then the Type of the Texel operand of that instruction must have at least as many components as the buffer view’s format

• VUID-vkCmdDispatchBase-SampledType-04470
If a VkImageView with a VkFormat that has a 64-bit component width is accessed as a result of this command, the SampledType of the OpTypeImage operand of that instruction must have a Width of 64

• VUID-vkCmdDispatchBase-SampledType-04471
If a VkImageView with a VkFormat that has a component width less than 64-bit is accessed as a result of this command, the SampledType of the OpTypeImage operand of that instruction must have a Width of 32

• VUID-vkCmdDispatchBase-SampledType-04472
If a VkBufferView with a VkFormat that has a 64-bit component width is accessed as a result of this command, the SampledType of the OpTypeImage operand of that instruction must have a Width of 64

• VUID-vkCmdDispatchBase-SampledType-04473
If a VkBufferView with a VkFormat that has a component width less than 64-bit is accessed as a result of this command, the SampledType of the OpTypeImage operand of that instruction must have a Width of 32

• VUID-vkCmdDispatchBase-sparseImageInt64Atomics-04474
If the sparseImageInt64Atomics feature is not enabled, VkImage objects created with the VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT flag must not be accessed by atomic instructions through an OpTypeImage with a SampledType with a Width of 64 by this command

• VUID-vkCmdDispatchBase-sparseImageInt64Atomics-04475
If the sparseImageInt64Atomics feature is not enabled, VkBuffer objects created with the VK_BUFFER_CREATE_SPARSE_RESIDENCY_BIT flag must not be accessed by atomic instructions through an OpTypeImage with a SampledType with a Width of 64 by this command

• VUID-vkCmdDispatchBase-OpImageWeightedSampleQCOM-06971
If OpImageWeightedSampleQCOM is used to sample a VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_2_WEIGHT_SAMPLED_IMAGE_BIT_QCOM

• VUID-vkCmdDispatchBase-OpImageWeightedSampleQCOM-06972
If OpImageWeightedSampleQCOM uses a VkImageView as a sample weight image as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_2_WEIGHT_IMAGE_BIT_QCOM

• VUID-vkCmdDispatchBase-OpImageBoxFilterQCOM-06973
If OpImageBoxFilterQCOM is used to sample a VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_2_BOX_FILTER_SAMPLED_BIT_QCOM

• VUID-vkCmdDispatchBase-OpImageBlockMatchSSDQCOM-06974
If OpImageBlockMatchSSDQCOM is used to read from an VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_2_BLOCK_MATCHING_BIT_QCOM

If OpImageBlockMatchSADQCOM is used to read from an VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_2_BLOCK_MATCHING_BIT_QCOM

If OpImageBlockMatchSADQCOM or OpImageBlockMatchSSDQCOM is used to read from a reference image as result of this command, then the specified reference coordinates must not fail integer texel coordinate validation.

• VUID-vkCmdDispatchBase-OpImageWeightedSampleQCOM-06977
If OpImageWeightedSampleQCOM, OpImageBoxFilterQCOM, OpImageBlockMatchSSDQCOM, or OpImageBlockMatchSADQCOM uses a VkSampler as a result of this command, then the sampler must have been created with VK_SAMPLER_CREATE_IMAGE_PROCESSING_BIT_QCOM.

• VUID-vkCmdDispatchBase-OpImageWeightedSampleQCOM-06978
If any command other than OpImageWeightedSampleQCOM, OpImageBoxFilterQCOM, OpImageBlockMatchSSDQCOM, or OpImageBlockMatchSADQCOM uses a VkSampler as a result of this command, then the sampler must not have been created with VK_SAMPLER_CREATE_IMAGE_PROCESSING_BIT_QCOM.

• VUID-vkCmdDispatchBase-None-07288
Any shader invocation executed by this command must terminate

• VUID-vkCmdDispatchBase-commandBuffer-02712
If commandBuffer is a protected command buffer and protectedNoFault is not supported, any resource written to by the VkPipeline object bound to the pipeline bind point used by this command must not be an unprotected resource

• VUID-vkCmdDispatchBase-commandBuffer-02713
If commandBuffer is a protected command buffer and protectedNoFault is not supported, pipeline stages other than the framebuffer-space and compute stages in the VkPipeline object bound to the pipeline bind point used by this command must not write to any resource

• VUID-vkCmdDispatchBase-commandBuffer-04617
If any of the shader stages of the VkPipeline bound to the pipeline bind point used by this command uses the RayQueryKHR capability, then commandBuffer must not be a protected command buffer

• VUID-vkCmdDispatchBase-baseGroupX-00421
baseGroupX must be less than VkPhysicalDeviceLimits::maxComputeWorkGroupCount[0]

• VUID-vkCmdDispatchBase-baseGroupX-00422
baseGroupY must be less than VkPhysicalDeviceLimits::maxComputeWorkGroupCount[1]

• VUID-vkCmdDispatchBase-baseGroupZ-00423
baseGroupZ must be less than VkPhysicalDeviceLimits::maxComputeWorkGroupCount[2]

• VUID-vkCmdDispatchBase-groupCountX-00424
groupCountX must be less than or equal to VkPhysicalDeviceLimits::maxComputeWorkGroupCount[0] minus baseGroupX

• VUID-vkCmdDispatchBase-groupCountY-00425
groupCountY must be less than or equal to VkPhysicalDeviceLimits::maxComputeWorkGroupCount[1] minus baseGroupY

• VUID-vkCmdDispatchBase-groupCountZ-00426
groupCountZ must be less than or equal to VkPhysicalDeviceLimits::maxComputeWorkGroupCount[2] minus baseGroupZ

• VUID-vkCmdDispatchBase-baseGroupX-00427
If any of baseGroupX, baseGroupY, or baseGroupZ are not zero, then the bound compute pipeline must have been created with the VK_PIPELINE_CREATE_DISPATCH_BASE flag

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

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

• VUID-vkCmdDispatchBase-commandBuffer-cmdpool
The VkCommandPool that commandBuffer was allocated from must support compute operations

• VUID-vkCmdDispatchBase-renderpass
This command must only be called outside of a render pass instance

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

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

Primary
Secondary

Outside

Outside

Compute

Action

## Document Notes

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

Copyright 2014-2022 The Khronos Group Inc.