131 lines
4.8 KiB
Plaintext
131 lines
4.8 KiB
Plaintext
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// This section is included inside the Pipelines chapter (pipelines.txt)
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[[pipelines-raytracing]]
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== Raytracing Pipeline
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Raytracing pipelines consist of multiple shader stages, fixed-function
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traversal stages, and a pipeline layout.
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[open,refpage='vkCreateRaytracingPipelinesNVX',desc='Creates a new raytracing pipeline object',type='protos']
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--
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To create raytracing pipelines, call:
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include::../../api/protos/vkCreateRaytracingPipelinesNVX.txt[]
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* pname:device is the logical device that creates the raytracing
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pipelines.
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* pname:pipelineCache is either dlink:VK_NULL_HANDLE, indicating that
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pipeline caching is disabled; or the handle of a valid
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<<pipelines-cache,pipeline cache>> object, in which case use of that
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cache is enabled for the duration of the command.
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* pname:createInfoCount is the length of the pname:pCreateInfos and
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pname:pPipelines arrays.
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* pname:pCreateInfos is an array of
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sname:VkRaytracingPipelineCreateInfoNVX structures.
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* pname:pAllocator controls host memory allocation as described in the
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<<memory-allocation, Memory Allocation>> chapter.
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* pname:pPipelines is a pointer to an array in which the resulting compute
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pipeline objects are returned.
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.Valid Usage
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****
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****
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include::../../validity/protos/vkCreateRaytracingPipelinesNVX.txt[]
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--
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[open,refpage='VkRaytracingPipelineCreateInfoNVX',desc='Structure specifying parameters of a newly created raytracing pipeline',type='structs']
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--
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The sname:VkRaytracingPipelineCreateInfoNVX structure is defined as:
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include::../../api/structs/VkRaytracingPipelineCreateInfoNVX.txt[]
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* pname:sType is the type of this structure.
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* pname:pNext is `NULL` or a pointer to an extension-specific structure.
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* pname:flags is a bitmask of elink:VkPipelineCreateFlagBits specifying
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how the pipeline will be generated.
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* pname:stageCount is the number of entries in the pname:pStages and
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pname:pGroupNumbers arrays.
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* pname:pStages is an array of size pname:stageCount structures of type
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slink:VkPipelineShaderStageCreateInfo describing the set of the shader
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stages to be included in the raytracing pipeline.
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* pname:pGroupNumbers is an array of size pname:stageCount integers, where
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each integer indicates the hit group that the corresponding shader
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belongs to.
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* pname:maxRecursionDepth is the maximum recursion that will be called
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from this pipeline.
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* pname:layout is the description of binding locations used by both the
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pipeline and descriptor sets used with the pipeline.
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* pname:basePipelineHandle is a pipeline to derive from.
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* pname:basePipelineIndex is an index into the pname:pCreateInfos
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parameter to use as a pipeline to derive from.
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The parameters pname:basePipelineHandle and pname:basePipelineIndex are
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described in more detail in <<pipelines-pipeline-derivatives,Pipeline
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Derivatives>>.
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.Valid Usage
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****
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****
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include::../../validity/structs/VkRaytracingPipelineCreateInfoNVX.txt[]
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--
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[open,refpage='vkGetRaytracingShaderHandlesNVX',desc='Query raytracing pipeline shader handles',type='protos']
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--
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To query the opaque handles of shaders in the raytracing pipeline, call:
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include::../../api/protos/vkGetRaytracingShaderHandlesNVX.txt[]
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* pname:device is the logical device that contains the raytracing
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pipeline.
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* pname:pipeline is the raytracing pipeline object that contains the
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shaders.
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* pname:firstShader is the index of the first shader to retrieve a handle
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for from the pname:pStages array of
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sname:VkPipelineShaderStageCreateInfo entries.
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* pname:shaderCount is the number of shader handles to retrieve.
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* pname:dataSize is the size in bytes of the buffer pointed to by pData.
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* pname:pData is a pointer to a user-allocated buffer where the results
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will be written.
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.Valid Usage
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****
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****
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include::../../validity/protos/vkGetRaytracingShaderHandlesNVX.txt[]
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--
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Raytracing pipelines can contain more shaders than a graphics or compute
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pipeline, so to allow parallel compilation of shaders within a pipeline, an
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application may: choose to defer compilation until a later point in time.
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[open,refpage='vkCompileDeferredNVX',desc='Deferred compilation of shaders',type='protos']
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--
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To compile a deferred shader in a pipeline call:
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include::../../api/protos/vkCompileDeferredNVX.txt[]
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* pname:device is the logical device that contains the raytracing
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pipeline.
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* pname:pipeline is the raytracing pipeline object that contains the
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shaders.
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* pname:shader is the index of the shader to compile.
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.Valid Usage
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****
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* [[VUID-vkCompileDeferredNVX-pipeline-02237]]
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pname:pipeline must: have been created with
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VK_PIPELINE_CREATE_DEFER_COMPILE_BIT_NVX.
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* [[VUID-vkCompileDeferredNVX-shader-02238]]
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pname:shader must: not have been called as a deferred compile before.
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****
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include::../../validity/protos/vkCompileDeferredNVX.txt[]
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--
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