396 lines
19 KiB
Plaintext
396 lines
19 KiB
Plaintext
// Copyright (c) 2015-2018 Khronos Group. This work is licensed under a
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// Creative Commons Attribution 4.0 International License; see
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// http://creativecommons.org/licenses/by/4.0/
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[[dispatch]]
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= Dispatching Commands
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_Dispatching commands_ (commands with ftext:Dispatch in the name) provoke
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work in a compute pipeline.
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Dispatching commands are recorded into a command buffer and when executed by
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a queue, will produce work which executes according to the bound compute
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pipeline.
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A compute pipeline must: be bound to a command buffer before any dispatch
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commands are recorded in that command buffer.
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[open,refpage='vkCmdDispatch',desc='Dispatch compute work items',type='protos']
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--
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To record a dispatch, call:
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include::../api/protos/vkCmdDispatch.txt[]
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* pname:commandBuffer is the command buffer into which the command will be
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recorded.
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* pname:groupCountX is the number of local workgroups to dispatch in the X
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dimension.
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* pname:groupCountY is the number of local workgroups to dispatch in the Y
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dimension.
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* pname:groupCountZ is the number of local workgroups to dispatch in the Z
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dimension.
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When the command is executed, a global workgroup consisting of
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[eq]#groupCountX {times} groupCountY {times} groupCountZ# local workgroups
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is assembled.
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.Valid Usage
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****
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* [[VUID-vkCmdDispatch-groupCountX-00386]]
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pname:groupCountX must: be less than or equal to
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sname:VkPhysicalDeviceLimits::pname:maxComputeWorkGroupCount[0]
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* [[VUID-vkCmdDispatch-groupCountY-00387]]
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pname:groupCountY must: be less than or equal to
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sname:VkPhysicalDeviceLimits::pname:maxComputeWorkGroupCount[1]
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* [[VUID-vkCmdDispatch-groupCountZ-00388]]
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pname:groupCountZ must: be less than or equal to
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sname:VkPhysicalDeviceLimits::pname:maxComputeWorkGroupCount[2]
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* [[VUID-vkCmdDispatch-None-00389]]
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For each set _n_ that is statically used by the sname:VkPipeline bound
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to ename:VK_PIPELINE_BIND_POINT_COMPUTE, a descriptor set must: have
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been bound to _n_ at ename:VK_PIPELINE_BIND_POINT_COMPUTE, with a
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sname:VkPipelineLayout that is compatible for set _n_, with the
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sname:VkPipelineLayout used to create the current sname:VkPipeline, as
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described in <<descriptorsets-compatibility>>
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* [[VUID-vkCmdDispatch-None-00390]]
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Descriptors in each bound descriptor set, specified via
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fname:vkCmdBindDescriptorSets, must: be valid if they are statically
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used by the bound sname:VkPipeline object, specified via
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fname:vkCmdBindPipeline
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* [[VUID-vkCmdDispatch-None-00391]]
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A valid compute pipeline must: be bound to the current command buffer
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with ename:VK_PIPELINE_BIND_POINT_COMPUTE
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* [[VUID-vkCmdDispatch-None-00392]]
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For each push constant that is statically used by the sname:VkPipeline
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bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE, a push constant value
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must: have been set for ename:VK_PIPELINE_BIND_POINT_COMPUTE, with a
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sname:VkPipelineLayout that is compatible for push constants with the
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one used to create the current sname:VkPipeline, as described in
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<<descriptorsets-compatibility>>
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* [[VUID-vkCmdDispatch-None-00393]]
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If any sname:VkSampler object that is accessed from a shader by the
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sname:VkPipeline bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE uses
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unnormalized coordinates, it must: not be used to sample from any
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sname:VkImage with a sname:VkImageView of the type
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ename:VK_IMAGE_VIEW_TYPE_3D, ename:VK_IMAGE_VIEW_TYPE_CUBE,
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ename:VK_IMAGE_VIEW_TYPE_1D_ARRAY, ename:VK_IMAGE_VIEW_TYPE_2D_ARRAY or
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ename:VK_IMAGE_VIEW_TYPE_CUBE_ARRAY, in any shader stage
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* [[VUID-vkCmdDispatch-None-00394]]
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If any sname:VkSampler object that is accessed from a shader by the
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sname:VkPipeline bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE uses
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unnormalized coordinates, it must: not be used with any of the SPIR-V
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`OpImageSample*` or `OpImageSparseSample*` instructions with
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code:ImplicitLod, code:Dref or code:Proj in their name, in any shader
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stage
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* [[VUID-vkCmdDispatch-None-00395]]
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If any sname:VkSampler object that is accessed from a shader by the
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sname:VkPipeline bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE uses
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unnormalized coordinates, it must: not be used with any of the SPIR-V
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`OpImageSample*` or `OpImageSparseSample*` instructions that includes a
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LOD bias or any offset values, in any shader stage
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* [[VUID-vkCmdDispatch-None-00396]]
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If the <<features-features-robustBufferAccess,robust buffer access>>
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feature is not enabled, and any shader stage in the sname:VkPipeline
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object bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE accesses a uniform
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buffer, it must: not access values outside of the range of that buffer
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specified in the bound descriptor set
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* [[VUID-vkCmdDispatch-None-00397]]
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If the <<features-features-robustBufferAccess,robust buffer access>>
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feature is not enabled, and any shader stage in the sname:VkPipeline
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object bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE accesses a storage
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buffer, it must: not access values outside of the range of that buffer
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specified in the bound descriptor set
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* [[VUID-vkCmdDispatch-linearTilingFeatures-00398]]
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Any sname:VkImageView being sampled with ename:VK_FILTER_LINEAR as a
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result of this command must: be of a format which supports linear
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filtering, as specified by the
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ename:VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT flag in
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sname:VkFormatProperties::pname:linearTilingFeatures (for a linear
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image) or sname:VkFormatProperties::pname:optimalTilingFeatures(for an
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optimally tiled image) returned by
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fname:vkGetPhysicalDeviceFormatProperties
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ifdef::VK_IMG_filter_cubic[]
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* [[VUID-vkCmdDispatch-linearTilingFeatures-00399]]
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Any slink:VkImageView being sampled with ename:VK_FILTER_CUBIC_IMG as a
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result of this command must: be of a format which supports cubic
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filtering, as specified by the
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ename:VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_CUBIC_BIT_IMG flag in
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sname:VkFormatProperties::pname:linearTilingFeatures (for a linear
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image) or sname:VkFormatProperties::pname:optimalTilingFeatures(for an
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optimally tiled image) returned by
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fname:vkGetPhysicalDeviceFormatProperties
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* [[VUID-vkCmdDispatch-None-00400]]
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Any slink:VkImageView being sampled with ename:VK_FILTER_CUBIC_IMG as a
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result of this command must: not have a elink:VkImageViewType of
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ename:VK_IMAGE_VIEW_TYPE_3D, ename:VK_IMAGE_VIEW_TYPE_CUBE, or
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ename:VK_IMAGE_VIEW_TYPE_CUBE_ARRAY
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endif::VK_IMG_filter_cubic[]
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ifdef::VK_VERSION_1_1[]
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* [[VUID-vkCmdDispatch-commandBuffer-01844]]
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If pname:commandBuffer is an unprotected command buffer, and any
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pipeline stage in the sname:VkPipeline object bound to
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ename:VK_PIPELINE_BIND_POINT_COMPUTE reads from or writes to any image
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or buffer, that image or buffer must: not be a protected image or
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protected buffer.
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* [[VUID-vkCmdDispatch-commandBuffer-01845]]
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If pname:commandBuffer is a protected command buffer, and any pipeline
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stage in the sname:VkPipeline object bound to
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ename:VK_PIPELINE_POINT_COMPUTE writes to any image or buffer, that
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image or buffer must: not be an unprotected image or unprotected buffer.
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* [[VUID-vkCmdDispatch-commandBuffer-01846]]
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If pname:commandBuffer is a protected command buffer, and any pipeline
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stage other than the compute pipeline stage in the sname:VkPipeline
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object bound to ename:VK_PIPELINE_POINT_COMPUTE reads from any image or
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buffer, the image or buffer must: not be a protected image or protected
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buffer.
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endif::VK_VERSION_1_1[]
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****
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include::../validity/protos/vkCmdDispatch.txt[]
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--
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[open,refpage='vkCmdDispatchIndirect',desc='Dispatch compute work items using indirect parameters',type='protos']
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--
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To record an indirect command dispatch, call:
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include::../api/protos/vkCmdDispatchIndirect.txt[]
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* pname:commandBuffer is the command buffer into which the command will be
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recorded.
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* pname:buffer is the buffer containing dispatch parameters.
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* pname:offset is the byte offset into pname:buffer where parameters
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begin.
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fname:vkCmdDispatchIndirect behaves similarly to flink:vkCmdDispatch except
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that the parameters are read by the device from a buffer during execution.
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The parameters of the dispatch are encoded in a
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slink:VkDispatchIndirectCommand structure taken from pname:buffer starting
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at pname:offset.
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.Valid Usage
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****
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* [[VUID-vkCmdDispatchIndirect-buffer-00401]]
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If pname:buffer is non-sparse then it must: be bound completely and
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contiguously to a single sname:VkDeviceMemory object
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* [[VUID-vkCmdDispatchIndirect-None-00402]]
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For each set _n_ that is statically used by the sname:VkPipeline bound
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to ename:VK_PIPELINE_BIND_POINT_COMPUTE, a descriptor set must: have
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been bound to _n_ at ename:VK_PIPELINE_BIND_POINT_COMPUTE, with a
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sname:VkPipelineLayout that is compatible for set _n_, with the
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sname:VkPipelineLayout used to create the current sname:VkPipeline, as
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described in <<descriptorsets-compatibility>>
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* [[VUID-vkCmdDispatchIndirect-None-00403]]
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Descriptors in each bound descriptor set, specified via
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fname:vkCmdBindDescriptorSets, must: be valid if they are statically
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used by the bound sname:VkPipeline object, specified via
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fname:vkCmdBindPipeline
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* [[VUID-vkCmdDispatchIndirect-None-00404]]
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A valid compute pipeline must: be bound to the current command buffer
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with ename:VK_PIPELINE_BIND_POINT_COMPUTE
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* [[VUID-vkCmdDispatchIndirect-buffer-00405]]
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pname:buffer must: have been created with the
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ename:VK_BUFFER_USAGE_INDIRECT_BUFFER_BIT bit set
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* [[VUID-vkCmdDispatchIndirect-offset-00406]]
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pname:offset must: be a multiple of `4`
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* [[VUID-vkCmdDispatchIndirect-offset-00407]]
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The sum of pname:offset and the size of sname:VkDispatchIndirectCommand
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must: be less than or equal to the size of pname:buffer
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* [[VUID-vkCmdDispatchIndirect-None-00408]]
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For each push constant that is statically used by the sname:VkPipeline
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bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE, a push constant value
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must: have been set for ename:VK_PIPELINE_BIND_POINT_COMPUTE, with a
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sname:VkPipelineLayout that is compatible for push constants with the
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one used to create the current sname:VkPipeline, as described in
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<<descriptorsets-compatibility>>
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* [[VUID-vkCmdDispatchIndirect-None-00409]]
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If any sname:VkSampler object that is accessed from a shader by the
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sname:VkPipeline bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE uses
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unnormalized coordinates, it must: not be used to sample from any
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sname:VkImage with a sname:VkImageView of the type
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ename:VK_IMAGE_VIEW_TYPE_3D, ename:VK_IMAGE_VIEW_TYPE_CUBE,
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ename:VK_IMAGE_VIEW_TYPE_1D_ARRAY, ename:VK_IMAGE_VIEW_TYPE_2D_ARRAY or
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ename:VK_IMAGE_VIEW_TYPE_CUBE_ARRAY, in any shader stage
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* [[VUID-vkCmdDispatchIndirect-None-00410]]
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If any sname:VkSampler object that is accessed from a shader by the
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sname:VkPipeline bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE uses
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unnormalized coordinates, it must: not be used with any of the SPIR-V
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`OpImageSample*` or `OpImageSparseSample*` instructions with
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code:ImplicitLod, code:Dref or code:Proj in their name, in any shader
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stage
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* [[VUID-vkCmdDispatchIndirect-None-00411]]
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If any sname:VkSampler object that is accessed from a shader by the
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sname:VkPipeline bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE uses
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unnormalized coordinates, it must: not be used with any of the SPIR-V
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`OpImageSample*` or `OpImageSparseSample*` instructions that includes a
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LOD bias or any offset values, in any shader stage
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* [[VUID-vkCmdDispatchIndirect-None-00412]]
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If the <<features-features-robustBufferAccess,robust buffer access>>
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feature is not enabled, and any shader stage in the sname:VkPipeline
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object bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE accesses a uniform
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buffer, it must: not access values outside of the range of that buffer
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specified in the bound descriptor set
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* [[VUID-vkCmdDispatchIndirect-None-00413]]
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If the <<features-features-robustBufferAccess,robust buffer access>>
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feature is not enabled, and any shader stage in the sname:VkPipeline
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object bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE accesses a storage
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buffer, it must: not access values outside of the range of that buffer
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specified in the bound descriptor set
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* [[VUID-vkCmdDispatchIndirect-linearTilingFeatures-00414]]
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Any sname:VkImageView being sampled with ename:VK_FILTER_LINEAR as a
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result of this command must: be of a format which supports linear
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filtering, as specified by the
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ename:VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT flag in
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sname:VkFormatProperties::pname:linearTilingFeatures (for a linear
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image) or sname:VkFormatProperties::pname:optimalTilingFeatures(for an
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optimally tiled image) returned by
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fname:vkGetPhysicalDeviceFormatProperties
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ifdef::VK_IMG_filter_cubic[]
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* [[VUID-vkCmdDispatchIndirect-linearTilingFeatures-00415]]
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Any slink:VkImageView being sampled with ename:VK_FILTER_CUBIC_IMG as a
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result of this command must: be of a format which supports cubic
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filtering, as specified by the
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ename:VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_CUBIC_BIT_IMG flag in
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sname:VkFormatProperties::pname:linearTilingFeatures (for a linear
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image) or sname:VkFormatProperties::pname:optimalTilingFeatures(for an
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optimally tiled image) returned by
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fname:vkGetPhysicalDeviceFormatProperties
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* [[VUID-vkCmdDispatchIndirect-None-00416]]
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Any slink:VkImageView being sampled with ename:VK_FILTER_CUBIC_IMG as a
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result of this command must: not have a elink:VkImageViewType of
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ename:VK_IMAGE_VIEW_TYPE_3D, ename:VK_IMAGE_VIEW_TYPE_CUBE, or
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ename:VK_IMAGE_VIEW_TYPE_CUBE_ARRAY
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endif::VK_IMG_filter_cubic[]
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ifdef::VK_VERSION_1_1[]
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* [[VUID-vkCmdDispatchIndirect-commandBuffer-01847]]
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If pname:commandBuffer is an unprotected command buffer, and any
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pipeline stage in the sname:VkPipeline object bound to
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ename:VK_PIPELINE_BIND_POINT_COMPUTE reads from or writes to any image
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or buffer, that image or buffer must: not be a protected image or
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protected buffer.
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* [[VUID-vkCmdDispatchIndirect-commandBuffer-01848]]
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If pname:commandBuffer is a protected command buffer, and any pipeline
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stage in the sname:VkPipeline object bound to
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ename:VK_PIPELINE_POINT_COMPUTE writes to any image or buffer, that
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image or buffer must: not be an unprotected image or unprotected buffer.
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* [[VUID-vkCmdDispatchIndirect-commandBuffer-01849]]
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If pname:commandBuffer is a protected command buffer, and any pipeline
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stage other than the compute pipeline stage in the sname:VkPipeline
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object bound to ename:VK_PIPELINE_POINT_COMPUTE reads from any image or
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buffer, the image or buffer must: not be a protected image or protected
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buffer.
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endif::VK_VERSION_1_1[]
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****
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include::../validity/protos/vkCmdDispatchIndirect.txt[]
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--
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[open,refpage='VkDispatchIndirectCommand',desc='Structure specifying a dispatch indirect command',type='structs',xrefs='vkCmdDispatchIndirect']
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--
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The sname:VkDispatchIndirectCommand structure is defined as:
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include::../api/structs/VkDispatchIndirectCommand.txt[]
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* pname:x is the number of local workgroups to dispatch in the X
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dimension.
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* pname:y is the number of local workgroups to dispatch in the Y
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dimension.
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* pname:z is the number of local workgroups to dispatch in the Z
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dimension.
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The members of sname:VkDispatchIndirectCommand have the same meaning as the
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corresponding parameters of flink:vkCmdDispatch.
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.Valid Usage
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****
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* [[VUID-VkDispatchIndirectCommand-x-00417]]
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pname:x must: be less than or equal to
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sname:VkPhysicalDeviceLimits::pname:maxComputeWorkGroupCount[0]
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* [[VUID-VkDispatchIndirectCommand-y-00418]]
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pname:y must: be less than or equal to
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sname:VkPhysicalDeviceLimits::pname:maxComputeWorkGroupCount[1]
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* [[VUID-VkDispatchIndirectCommand-z-00419]]
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pname:z must: be less than or equal to
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sname:VkPhysicalDeviceLimits::pname:maxComputeWorkGroupCount[2]
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****
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include::../validity/structs/VkDispatchIndirectCommand.txt[]
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--
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ifdef::VK_VERSION_1_1,VK_KHR_device_group[]
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[open,refpage='vkCmdDispatchBase',desc='Dispatch compute work items',type='protos']
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--
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To record a dispatch using non-zero base values for the components of
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code:WorkgroupId, call:
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ifdef::VK_VERSION_1_1[]
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include::../api/protos/vkCmdDispatchBase.txt[]
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endif::VK_VERSION_1_1[]
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ifdef::VK_VERSION_1_1+VK_KHR_device_group[or the equivalent command]
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ifdef::VK_KHR_device_group[]
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include::../api/protos/vkCmdDispatchBaseKHR.txt[]
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endif::VK_KHR_device_group[]
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* pname:commandBuffer is the command buffer into which the command will be
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recorded.
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* pname:baseGroupX is the start value for the X component of
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code:WorkgroupId.
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* pname:baseGroupY is the start value for the Y component of
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code:WorkgroupId.
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* pname:baseGroupZ is the start value for the Z component of
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code:WorkgroupId.
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* pname:groupCountX is the number of local workgroups to dispatch in the X
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dimension.
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* pname:groupCountY is the number of local workgroups to dispatch in the Y
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dimension.
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* pname:groupCountZ is the number of local workgroups to dispatch in the Z
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dimension.
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When the command is executed, a global workgroup consisting of
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[eq]#groupCountX {times} groupCountY {times} groupCountZ# local workgroups
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is assembled, with code:WorkgroupId values ranging from [eq]#[baseGroup,
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baseGroup {plus} groupCount)# in each component.
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flink:vkCmdDispatch is equivalent to
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vkCmdDispatchBase(0,0,0,groupCountX,groupCountY,groupCountZ).
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.Valid Usage
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****
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* [[VUID-vkCmdDispatchBase-None-00420]]
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All valid usage rules from flink:vkCmdDispatch apply
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* [[VUID-vkCmdDispatchBase-baseGroupX-00421]]
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pname:baseGroupX must: be less than
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sname:VkPhysicalDeviceLimits::pname:maxComputeWorkGroupCount[0]
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* [[VUID-vkCmdDispatchBase-baseGroupX-00422]]
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pname:baseGroupX must: be less than
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sname:VkPhysicalDeviceLimits::pname:maxComputeWorkGroupCount[1]
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* [[VUID-vkCmdDispatchBase-baseGroupZ-00423]]
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pname:baseGroupZ must: be less than
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sname:VkPhysicalDeviceLimits::pname:maxComputeWorkGroupCount[2]
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* [[VUID-vkCmdDispatchBase-groupCountX-00424]]
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pname:groupCountX must: be less than or equal to
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sname:VkPhysicalDeviceLimits::pname:maxComputeWorkGroupCount[0] minus
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pname:baseGroupX
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* [[VUID-vkCmdDispatchBase-groupCountY-00425]]
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pname:groupCountY must: be less than or equal to
|
|
sname:VkPhysicalDeviceLimits::pname:maxComputeWorkGroupCount[1] minus
|
|
pname:baseGroupY
|
|
* [[VUID-vkCmdDispatchBase-groupCountZ-00426]]
|
|
pname:groupCountZ must: be less than or equal to
|
|
sname:VkPhysicalDeviceLimits::pname:maxComputeWorkGroupCount[2] minus
|
|
pname:baseGroupZ
|
|
* [[VUID-vkCmdDispatchBase-baseGroupX-00427]]
|
|
If any of pname:baseGroupX, pname:baseGroupY, or pname:baseGroupZ are
|
|
not zero, then the bound compute pipeline must: have been created with
|
|
the ename:VK_PIPELINE_CREATE_DISPATCH_BASE flag.
|
|
****
|
|
|
|
include::../validity/protos/vkCmdDispatchBase.txt[]
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|
--
|
|
|
|
endif::VK_VERSION_1_1,VK_KHR_device_group[]
|