243 lines
12 KiB
Plaintext
243 lines
12 KiB
Plaintext
// Copyright (c) 2015-2017 The Khronos Group Inc.
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// Copyright notice at https://www.khronos.org/registry/speccopyright.html
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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 currently bound
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compute 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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// refBegin vkCmdDispatch Dispatch compute work items
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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: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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When the command is executed, a global workgroup consisting of [eq]#x
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{times} y {times} z# local workgroups is assembled.
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.Valid Usage
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****
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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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* pname:y must: be less than or equal to
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sname:VkPhysicalDeviceLimits::pname:maxComputeWorkGroupCount[1]
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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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* For each set _n_ that is statically used by the sname:VkPipeline
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currently bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE, a descriptor
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set must: have been bound to _n_ at
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ename:VK_PIPELINE_BIND_POINT_COMPUTE, with a sname:VkPipelineLayout that
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is compatible for set _n_, with the sname:VkPipelineLayout used to
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create the current sname:VkPipeline, as described in
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<<descriptorsets-compatibility>>
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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 currently bound sname:VkPipeline object, specified via
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fname:vkCmdBindPipeline
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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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* For each push constant that is statically used by the sname:VkPipeline
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currently bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE, a push constant
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value must: have been set for ename:VK_PIPELINE_BIND_POINT_COMPUTE, with
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a 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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* If any sname:VkSampler object that is accessed from a shader by the
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sname:VkPipeline currently bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE
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uses 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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* If any sname:VkSampler object that is accessed from a shader by the
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sname:VkPipeline currently bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE
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uses unnormalized coordinates, it must: not be used with any of the
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SPIR-V `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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* If any sname:VkSampler object that is accessed from a shader by the
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sname:VkPipeline currently bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE
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uses unnormalized coordinates, it must: not be used with any of the
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SPIR-V `OpImageSample*` or `OpImageSparseSample*` instructions that
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includes a LOD bias or any offset values, in any shader stage
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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 currently bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE accesses
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a uniform buffer, it must: not access values outside of the range of
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that buffer specified in the currently bound descriptor set
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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 currently bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE accesses
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a storage buffer, it must: not access values outside of the range of
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that buffer specified in the currently bound descriptor set
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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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* 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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* 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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****
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include::../validity/protos/vkCmdDispatch.txt[]
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// refBegin vkCmdDispatchIndirect Dispatch compute work items using indirect parameters
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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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* 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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* For each set _n_ that is statically used by the sname:VkPipeline
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currently bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE, a descriptor
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set must: have been bound to _n_ at
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ename:VK_PIPELINE_BIND_POINT_COMPUTE, with a sname:VkPipelineLayout that
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is compatible for set _n_, with the sname:VkPipelineLayout used to
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create the current sname:VkPipeline, as described in
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<<descriptorsets-compatibility>>
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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 currently bound sname:VkPipeline object, specified via
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fname:vkCmdBindPipeline
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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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* 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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* pname:offset must: be a multiple of `4`
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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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* For each push constant that is statically used by the sname:VkPipeline
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currently bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE, a push constant
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value must: have been set for ename:VK_PIPELINE_BIND_POINT_COMPUTE, with
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a 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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* If any sname:VkSampler object that is accessed from a shader by the
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sname:VkPipeline currently bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE
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uses 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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* If any sname:VkSampler object that is accessed from a shader by the
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sname:VkPipeline currently bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE
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uses unnormalized coordinates, it must: not be used with any of the
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SPIR-V `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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* If any sname:VkSampler object that is accessed from a shader by the
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sname:VkPipeline currently bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE
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uses unnormalized coordinates, it must: not be used with any of the
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SPIR-V `OpImageSample*` or `OpImageSparseSample*` instructions that
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includes a LOD bias or any offset values, in any shader stage
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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 currently bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE accesses
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a uniform buffer, it must: not access values outside of the range of
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that buffer specified in the currently bound descriptor set
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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 currently bound to ename:VK_PIPELINE_BIND_POINT_COMPUTE accesses
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a storage buffer, it must: not access values outside of the range of
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that buffer specified in the currently bound descriptor set
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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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* 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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* 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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****
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include::../validity/protos/vkCmdDispatchIndirect.txt[]
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// refBegin VkDispatchIndirectCommand Structure specifying a dispatch indirect command
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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 structure have the same
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meaning as the similarly named parameters of flink:vkCmdDispatch.
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.Valid Usage
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****
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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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* pname:y must: be less than or equal to
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sname:VkPhysicalDeviceLimits::pname:maxComputeWorkGroupCount[1]
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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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// refEnd VkDispatchIndirectCommand vkCmdDispatchIndirect
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