## C Specification

To dispatch ray tracing use:

// Provided by VK_NV_ray_tracing
void vkCmdTraceRaysNV(
VkCommandBuffer                             commandBuffer,
uint32_t                                    width,
uint32_t                                    height,
uint32_t                                    depth);

## Parameters

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

• raygenShaderBindingTableBuffer is the buffer object that holds the shader binding table data for the ray generation shader stage.

• raygenShaderBindingOffset is the offset in bytes (relative to raygenShaderBindingTableBuffer) of the ray generation shader being used for the trace.

• missShaderBindingTableBuffer is the buffer object that holds the shader binding table data for the miss shader stage.

• missShaderBindingOffset is the offset in bytes (relative to missShaderBindingTableBuffer) of the miss shader being used for the trace.

• missShaderBindingStride is the size in bytes of each shader binding table record in missShaderBindingTableBuffer.

• hitShaderBindingTableBuffer is the buffer object that holds the shader binding table data for the hit shader stages.

• hitShaderBindingOffset is the offset in bytes (relative to hitShaderBindingTableBuffer) of the hit shader group being used for the trace.

• hitShaderBindingStride is the size in bytes of each shader binding table record in hitShaderBindingTableBuffer.

• callableShaderBindingTableBuffer is the buffer object that holds the shader binding table data for the callable shader stage.

• callableShaderBindingOffset is the offset in bytes (relative to callableShaderBindingTableBuffer) of the callable shader being used for the trace.

• callableShaderBindingStride is the size in bytes of each shader binding table record in callableShaderBindingTableBuffer.

• width is the width of the ray trace query dimensions.

• height is height of the ray trace query dimensions.

• depth is depth of the ray trace query dimensions.

## Description

When the command is executed, a ray generation group of width × height × depth rays is assembled.

Valid Usage
• VUID-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-OpTypeImage-06423
Any VkImageView or VkBufferView being written as a storage image or storage texel buffer where the image format field of the OpTypeImage is Unknown then the view’s format feature must contain VK_FORMAT_FEATURE_2_STORAGE_WRITE_WITHOUT_FORMAT_BIT

• VUID-vkCmdTraceRaysNV-OpTypeImage-06424
Any VkImageView or VkBufferView being read as a storage image or storage texel buffer where the image format field of the OpTypeImage is Unknown then the view’s format feature must contain VK_FORMAT_FEATURE_2_STORAGE_READ_WITHOUT_FORMAT_BIT

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

• VUID-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-None-02705
If the robust buffer access feature is not enabled, and if the VkPipeline object bound to the pipeline bind point used by this command accesses a uniform buffer, it 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-vkCmdTraceRaysNV-None-02706
If the robust buffer access feature is not enabled, and if the VkPipeline object bound to the pipeline bind point used by this command accesses a storage buffer, it 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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-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-vkCmdTraceRaysNV-None-03429
Any shader group handle referenced by this call must have been queried from the currently bound ray tracing pipeline

• VUID-vkCmdTraceRaysNV-commandBuffer-04624
commandBuffer must not be a protected command buffer

• VUID-vkCmdTraceRaysNV-maxRecursionDepth-03625
This command must not cause a pipeline trace ray instruction to be executed from a shader invocation with a recursion depth greater than the value of maxRecursionDepth used to create the bound ray tracing pipeline

If raygenShaderBindingTableBuffer is non-sparse then it must be bound completely and contiguously to a single VkDeviceMemory object

raygenShaderBindingOffset must be less than the size of raygenShaderBindingTableBuffer

raygenShaderBindingOffset must be a multiple of VkPhysicalDeviceRayTracingPropertiesNV::shaderGroupBaseAlignment

If missShaderBindingTableBuffer is non-sparse then it must be bound completely and contiguously to a single VkDeviceMemory object

missShaderBindingOffset must be less than the size of missShaderBindingTableBuffer

missShaderBindingOffset must be a multiple of VkPhysicalDeviceRayTracingPropertiesNV::shaderGroupBaseAlignment

If hitShaderBindingTableBuffer is non-sparse then it must be bound completely and contiguously to a single VkDeviceMemory object

hitShaderBindingOffset must be less than the size of hitShaderBindingTableBuffer

hitShaderBindingOffset must be a multiple of VkPhysicalDeviceRayTracingPropertiesNV::shaderGroupBaseAlignment

If callableShaderBindingTableBuffer is non-sparse then it must be bound completely and contiguously to a single VkDeviceMemory object

callableShaderBindingOffset must be less than the size of callableShaderBindingTableBuffer

callableShaderBindingOffset must be a multiple of VkPhysicalDeviceRayTracingPropertiesNV::shaderGroupBaseAlignment

missShaderBindingStride must be a multiple of VkPhysicalDeviceRayTracingPropertiesNV::shaderGroupHandleSize

hitShaderBindingStride must be a multiple of VkPhysicalDeviceRayTracingPropertiesNV::shaderGroupHandleSize

callableShaderBindingStride must be a multiple of VkPhysicalDeviceRayTracingPropertiesNV::shaderGroupHandleSize

missShaderBindingStride must be less than or equal to VkPhysicalDeviceRayTracingPropertiesNV::maxShaderGroupStride

hitShaderBindingStride must be less than or equal to VkPhysicalDeviceRayTracingPropertiesNV::maxShaderGroupStride

callableShaderBindingStride must be less than or equal to VkPhysicalDeviceRayTracingPropertiesNV::maxShaderGroupStride

• VUID-vkCmdTraceRaysNV-width-02469
width must be less than or equal to VkPhysicalDeviceLimits::maxComputeWorkGroupCount[0]

• VUID-vkCmdTraceRaysNV-height-02470
height must be less than or equal to VkPhysicalDeviceLimits::maxComputeWorkGroupCount[1]

• VUID-vkCmdTraceRaysNV-depth-02471
depth must be less than or equal to VkPhysicalDeviceLimits::maxComputeWorkGroupCount[2]

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

raygenShaderBindingTableBuffer must be a valid VkBuffer handle

If missShaderBindingTableBuffer is not VK_NULL_HANDLE, missShaderBindingTableBuffer must be a valid VkBuffer handle

If hitShaderBindingTableBuffer is not VK_NULL_HANDLE, hitShaderBindingTableBuffer must be a valid VkBuffer handle

If callableShaderBindingTableBuffer is not VK_NULL_HANDLE, callableShaderBindingTableBuffer must be a valid VkBuffer handle

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

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

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

• VUID-vkCmdTraceRaysNV-commonparent
Each of callableShaderBindingTableBuffer, commandBuffer, hitShaderBindingTableBuffer, missShaderBindingTableBuffer, and raygenShaderBindingTableBuffer that are valid handles of non-ignored parameters 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 Supported Queue Types

Primary
Secondary

Outside

Compute

VK_NV_ray_tracing, VkBuffer, VkCommandBuffer, VkDeviceSize