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// Copyright (c) 2015-2019 Khronos Group. This work is licensed under a
// Creative Commons Attribution 4.0 International License; see
// http://creativecommons.org/licenses/by/4.0/
[appendix]
[[spirvenv]]
= Vulkan Environment for SPIR-V
Shaders for Vulkan are defined by the <<spirv-spec,Khronos SPIR-V
Specification>> as well as the <<spirv-extended,Khronos SPIR-V Extended
Instructions for GLSL>> Specification.
This appendix defines additional SPIR-V requirements applying to Vulkan
shaders.
== Versions and Formats
ifdef::VK_VERSION_1_1[]
A Vulkan 1.1 implementation must: support the 1.0, 1.1, 1.2, and 1.3
versions of SPIR-V and the 1.0 version of the SPIR-V Extended Instructions
for GLSL.
endif::VK_VERSION_1_1[]
ifndef::VK_VERSION_1_1[]
A Vulkan 1.0 implementation must: support the 1.0 version of SPIR-V and the
1.0 version of the SPIR-V Extended Instructions for GLSL.
endif::VK_VERSION_1_1[]
ifdef::VK_KHR_spirv_1_4[]
If the <<VK_KHR_spirv_1_4>> extension is enabled, the implementation must:
additionally support the 1.4 version of SPIR-V.
endif::VK_KHR_spirv_1_4[]
A SPIR-V module passed into flink:vkCreateShaderModule is interpreted as a
series of 32-bit words in host endianness, with literal strings packed as
described in section 2.2 of the SPIR-V Specification.
The first few words of the SPIR-V module must: be a magic number and a
SPIR-V version number, as described in section 2.3 of the SPIR-V
Specification.
[[spirvenv-capabilities]]
== Capabilities
The SPIR-V capabilities listed below must: be supported if the corresponding
feature or extension is enabled, or if no features or extensions are listed
for that capability.
Extensions are only listed when there is not also a feature bit associated
with that capability.
[[spirvenv-capabilities-table]]
.List of SPIR-V Capabilities and enabling features or extensions
[options="header"]
|====
| SPIR-V code:OpCapability | Vulkan feature or extension name
| code:Matrix |
| code:Shader |
| code:InputAttachment |
| code:Sampled1D |
| code:Image1D |
| code:SampledBuffer |
| code:ImageBuffer |
| code:ImageQuery |
| code:DerivativeControl |
| code:Geometry | <<features-geometryShader,geometryShader>>
| code:Tessellation | <<features-tessellationShader,tessellationShader>>
| code:Float64 | <<features-shaderFloat64,shaderFloat64>>
| code:Int64 | <<features-shaderInt64,shaderInt64>>
ifdef::VK_KHR_shader_atomic_int64[]
[[spirvenv-capabilities-table-int64atomics]]
| code:Int64Atomics | <<VK_KHR_shader_atomic_int64,VK_KHR_shader_atomic_int64>>
endif::VK_KHR_shader_atomic_int64[]
| code:Int16 | <<features-shaderInt16,shaderInt16>>
| code:TessellationPointSize | <<features-shaderTessellationAndGeometryPointSize,shaderTessellationAndGeometryPointSize>>
| code:GeometryPointSize | <<features-shaderTessellationAndGeometryPointSize,shaderTessellationAndGeometryPointSize>>
| code:ImageGatherExtended | <<features-shaderImageGatherExtended,shaderImageGatherExtended>>
| code:StorageImageMultisample | <<features-shaderStorageImageMultisample,shaderStorageImageMultisample>>
| code:UniformBufferArrayDynamicIndexing | <<features-shaderUniformBufferArrayDynamicIndexing,shaderUniformBufferArrayDynamicIndexing>>
| code:SampledImageArrayDynamicIndexing | <<features-shaderSampledImageArrayDynamicIndexing,shaderSampledImageArrayDynamicIndexing>>
| code:StorageBufferArrayDynamicIndexing | <<features-shaderStorageBufferArrayDynamicIndexing,shaderStorageBufferArrayDynamicIndexing>>
| code:StorageImageArrayDynamicIndexing | <<features-shaderStorageImageArrayDynamicIndexing,shaderStorageImageArrayDynamicIndexing>>
| code:ClipDistance | <<features-shaderClipDistance,shaderClipDistance>>
| code:CullDistance | <<features-shaderCullDistance,shaderCullDistance>>
| code:ImageCubeArray | <<features-imageCubeArray,imageCubeArray>>
| code:SampleRateShading | <<features-sampleRateShading,sampleRateShading>>
| code:SparseResidency | <<features-shaderResourceResidency,shaderResourceResidency>>
| code:MinLod | <<features-shaderResourceMinLod,shaderResourceMinLod>>
| code:SampledCubeArray | <<features-imageCubeArray,imageCubeArray>>
| code:ImageMSArray | <<features-shaderStorageImageMultisample,shaderStorageImageMultisample>>
| code:StorageImageExtendedFormats |
| code:InterpolationFunction | <<features-sampleRateShading,sampleRateShading>>
| code:StorageImageReadWithoutFormat | <<features-shaderStorageImageReadWithoutFormat,shaderStorageImageReadWithoutFormat>>
| code:StorageImageWriteWithoutFormat | <<features-shaderStorageImageWriteWithoutFormat,shaderStorageImageWriteWithoutFormat>>
| code:MultiViewport | <<features-multiViewport,multiViewport>>
ifdef::VK_VERSION_1_1,VK_KHR_shader_draw_parameters[]
| code:DrawParameters |
ifdef::VK_VERSION_1_1[]
<<features-shaderDrawParameters,shaderDrawParameters>>
endif::VK_VERSION_1_1[]
ifdef::VK_KHR_shader_draw_parameters+VK_VERSION_1_1[]
or
endif::VK_KHR_shader_draw_parameters+VK_VERSION_1_1[]
ifdef::VK_KHR_shader_draw_parameters[]
<<VK_KHR_shader_draw_parameters>>
endif::VK_KHR_shader_draw_parameters[]
endif::VK_VERSION_1_1,VK_KHR_shader_draw_parameters[]
ifdef::VK_VERSION_1_1,VK_KHR_multiview[]
[[spirvenv-capabilities-multiview]]
| code:MultiView |
ifndef::VK_VERSION_1_1[]
<<VK_KHR_multiview,VK_KHR_multiview>>
endif::VK_VERSION_1_1[]
endif::VK_VERSION_1_1,VK_KHR_multiview[]
ifdef::VK_VERSION_1_1,VK_KHR_device_group[]
| code:DeviceGroup |
ifndef::VK_VERSION_1_1[]
<<VK_KHR_device_group,VK_KHR_device_group>>
endif::VK_VERSION_1_1[]
endif::VK_VERSION_1_1,VK_KHR_device_group[]
ifdef::VK_VERSION_1_1,VK_KHR_variable_pointers[]
[[spirvenv-capabilities-table-variablepointers]]
| code:VariablePointersStorageBuffer | <<features-variablePointersStorageBuffer,variablePointersStorageBuffer>>
| code:VariablePointers | <<features-variablePointers,variablePointers>>
endif::VK_VERSION_1_1,VK_KHR_variable_pointers[]
ifdef::VK_KHR_shader_clock[]
[[spirvenv-capabilities-table-shaderclock]]
| code:ShaderClockKHR | `<<VK_KHR_shader_clock>>`
endif::VK_KHR_shader_clock[]
ifdef::VK_EXT_shader_stencil_export[]
[[spirvenv-capabilities-table-shaderstencilexportext]]
| code:StencilExportEXT | `<<VK_EXT_shader_stencil_export>>`
endif::VK_EXT_shader_stencil_export[]
ifdef::VK_EXT_shader_subgroup_ballot[]
[[spirvenv-capabilities-table-subgroupballot]]
| code:SubgroupBallotKHR | `<<VK_EXT_shader_subgroup_ballot>>`
endif::VK_EXT_shader_subgroup_ballot[]
ifdef::VK_EXT_shader_subgroup_vote[]
[[spirvenv-capabilities-table-subgroupvote]]
| code:SubgroupVoteKHR | `<<VK_EXT_shader_subgroup_vote>>`
endif::VK_EXT_shader_subgroup_vote[]
ifdef::VK_AMD_shader_image_load_store_lod[]
[[spirvenv-capabilities-table-imagereadwritelodamd]]
| code:ImageReadWriteLodAMD | `<<VK_AMD_shader_image_load_store_lod>>`
endif::VK_AMD_shader_image_load_store_lod[]
ifdef::VK_AMD_texture_gather_bias_lod[]
[[spirvenv-capabilities-table-imagegatherbiaslodamd]]
| code:ImageGatherBiasLodAMD | `<<VK_AMD_texture_gather_bias_lod>>`
endif::VK_AMD_texture_gather_bias_lod[]
ifdef::VK_AMD_shader_fragment_mask[]
[[spirvenv-capabilities-table-fragmentmaskamd]]
| code:FragmentMaskAMD | `<<VK_AMD_shader_fragment_mask>>`
endif::VK_AMD_shader_fragment_mask[]
ifdef::VK_NV_sample_mask_override_coverage[]
[[spirvenv-capabilities-table-samplemaskoverridecoverage]]
| code:SampleMaskOverrideCoverageNV | `<<VK_NV_sample_mask_override_coverage>>`
endif::VK_NV_sample_mask_override_coverage[]
ifdef::VK_NV_geometry_shader_passthrough[]
[[spirvenv-capabilities-table-geometryshaderpassthrough]]
| code:GeometryShaderPassthroughNV | `<<VK_NV_geometry_shader_passthrough>>`
endif::VK_NV_geometry_shader_passthrough[]
ifdef::VK_EXT_shader_viewport_index_layer[]
[[spirvenv-capabilities-table-shader-viewport-index-layer]]
| code:ShaderViewportIndexLayerEXT | `<<VK_EXT_shader_viewport_index_layer>>`
endif::VK_EXT_shader_viewport_index_layer[]
ifdef::VK_NV_viewport_array2[]
[[spirvenv-capabilities-table-viewportarray2]]
| code:ShaderViewportIndexLayerNV | `<<VK_NV_viewport_array2>>`
| code:ShaderViewportMaskNV | `<<VK_NV_viewport_array2>>`
endif::VK_NV_viewport_array2[]
ifdef::VK_NVX_multiview_per_view_attributes[]
[[spirvenv-capabilities-table-perviewattributes]]
| code:PerViewAttributesNV | `<<VK_NVX_multiview_per_view_attributes>>`
endif::VK_NVX_multiview_per_view_attributes[]
ifdef::VK_VERSION_1_1,VK_KHR_16bit_storage[]
[[spirvenv-capabilities-table-16bitstorage]]
| code:StorageBuffer16BitAccess | <<features-storageBuffer16BitAccess, StorageBuffer16BitAccess>>
| code:UniformAndStorageBuffer16BitAccess | <<features-uniformAndStorageBuffer16BitAccess,UniformAndStorageBuffer16BitAccess>>
| code:StoragePushConstant16 | <<features-storagePushConstant16,storagePushConstant16>>
| code:StorageInputOutput16 | <<features-storageInputOutput16,storageInputOutput16>>
endif::VK_VERSION_1_1,VK_KHR_16bit_storage[]
ifdef::VK_VERSION_1_1[]
[[spirvenv-capabilities-table-subgroup]]
| code:GroupNonUniform | <<features-subgroup-basic,VK_SUBGROUP_FEATURE_BASIC_BIT>>
| code:GroupNonUniformVote | <<features-subgroup-vote,VK_SUBGROUP_FEATURE_VOTE_BIT>>
| code:GroupNonUniformArithmetic | <<features-subgroup-arithmetic,VK_SUBGROUP_FEATURE_ARITHMETIC_BIT>>
| code:GroupNonUniformBallot | <<features-subgroup-ballot,VK_SUBGROUP_FEATURE_BALLOT_BIT>>
| code:GroupNonUniformShuffle | <<features-subgroup-shuffle,VK_SUBGROUP_FEATURE_SHUFFLE_BIT>>
| code:GroupNonUniformShuffleRelative | <<features-subgroup-shuffle-relative,VK_SUBGROUP_FEATURE_SHUFFLE_RELATIVE_BIT>>
| code:GroupNonUniformClustered | <<features-subgroup-clustered,VK_SUBGROUP_FEATURE_CLUSTERED_BIT>>
| code:GroupNonUniformQuad | <<features-subgroup-quad,VK_SUBGROUP_FEATURE_QUAD_BIT>>
ifdef::VK_NV_shader_subgroup_partitioned[]
| code:GroupNonUniformPartitionedNV | <<features-subgroup-partitioned,VK_SUBGROUP_FEATURE_PARTITIONED_BIT_NV>>
endif::VK_NV_shader_subgroup_partitioned[]
endif::VK_VERSION_1_1[]
ifdef::VK_EXT_post_depth_coverage[]
[[spirvenv-capabilities-table-postdepthcoverage]]
| code:SampleMaskPostDepthCoverage | `<<VK_EXT_post_depth_coverage>>`
endif::VK_EXT_post_depth_coverage[]
ifdef::VK_EXT_descriptor_indexing[]
[[spirvenv-capabilities-table-descriptorindexing]]
| code:ShaderNonUniformEXT | `<<VK_EXT_descriptor_indexing>>`
| code:RuntimeDescriptorArrayEXT | <<features-runtimeDescriptorArray,runtimeDescriptorArray>>
| code:InputAttachmentArrayDynamicIndexingEXT | <<features-shaderInputAttachmentArrayDynamicIndexing,shaderInputAttachmentArrayDynamicIndexing>>
| code:UniformTexelBufferArrayDynamicIndexingEXT | <<features-shaderUniformTexelBufferArrayDynamicIndexing,shaderUniformTexelBufferArrayDynamicIndexing>>
| code:StorageTexelBufferArrayDynamicIndexingEXT | <<features-shaderStorageTexelBufferArrayDynamicIndexing,shaderStorageTexelBufferArrayDynamicIndexing>>
| code:UniformBufferArrayNonUniformIndexingEXT | <<features-shaderUniformBufferArrayNonUniformIndexing,shaderUniformBufferArrayNonUniformIndexing>>
| code:SampledImageArrayNonUniformIndexingEXT | <<features-shaderSampledImageArrayNonUniformIndexing,shaderSampledImageArrayNonUniformIndexing>>
| code:StorageBufferArrayNonUniformIndexingEXT | <<features-shaderStorageBufferArrayNonUniformIndexing,shaderStorageBufferArrayNonUniformIndexing>>
| code:StorageImageArrayNonUniformIndexingEXT | <<features-shaderStorageImageArrayNonUniformIndexing,shaderStorageImageArrayNonUniformIndexing>>
| code:InputAttachmentArrayNonUniformIndexingEXT | <<features-shaderInputAttachmentArrayNonUniformIndexing,shaderInputAttachmentArrayNonUniformIndexing>>
| code:UniformTexelBufferArrayNonUniformIndexingEXT | <<features-shaderUniformTexelBufferArrayNonUniformIndexing,shaderUniformTexelBufferArrayNonUniformIndexing>>
| code:StorageTexelBufferArrayNonUniformIndexingEXT | <<features-shaderStorageTexelBufferArrayNonUniformIndexing,shaderStorageTexelBufferArrayNonUniformIndexing>>
endif::VK_EXT_descriptor_indexing[]
ifdef::VK_KHR_shader_float16_int8,VK_AMD_gpu_shader_half_float[]
| code:Float16 |
ifdef::VK_KHR_shader_float16_int8[]
<<features-shaderFloat16,shaderFloat16>>
endif::VK_KHR_shader_float16_int8[]
ifdef::VK_KHR_shader_float16_int8+VK_AMD_gpu_shader_half_float[or]
ifdef::VK_AMD_gpu_shader_half_float[]
`<<VK_AMD_gpu_shader_half_float>>`
endif::VK_AMD_gpu_shader_half_float[]
endif::VK_KHR_shader_float16_int8,VK_AMD_gpu_shader_half_float[]
ifdef::VK_KHR_shader_float16_int8[]
| code:Int8 | <<features-shaderInt8,shaderInt8>>
endif::VK_KHR_shader_float16_int8[]
ifdef::VK_KHR_8bit_storage[]
[[spirvenv-capabilities-table-8bitstorage]]
| code:StorageBuffer8BitAccess | <<features-storageBuffer8BitAccess,StorageBuffer8BitAccess>>
| code:UniformAndStorageBuffer8BitAccess | <<features-uniformAndStorageBuffer8BitAccess,UniformAndStorageBuffer8BitAccess>>
| code:StoragePushConstant8 | <<features-storagePushConstant8,StoragePushConstant8>>
endif::VK_KHR_8bit_storage[]
ifdef::VK_KHR_vulkan_memory_model[]
[[spirvenv-capabilities-table-memorymodel]]
| code:VulkanMemoryModelKHR | <<features-vulkanMemoryModel,vulkanMemoryModel>>
| code:VulkanMemoryModelDeviceScopeKHR | <<features-vulkanMemoryModel,vulkanMemoryModelDeviceScope>>
endif::VK_KHR_vulkan_memory_model[]
ifdef::VK_KHR_shader_float_controls[]
[[spirvenv-capabilities-table-shaderfloatcontrols]]
| code:DenormPreserve | <<features-shaderDenormPreserveFloat16,shaderDenormPreserveFloat16>>, <<features-shaderDenormPreserveFloat32,shaderDenormPreserveFloat32>>, <<features-shaderDenormPreserveFloat64,shaderDenormPreserveFloat64>>
| code:DenormFlushToZero | <<features-shaderDenormFlushToZeroFloat16,shaderDenormFlushToZeroFloat16>>, <<features-shaderDenormFlushToZeroFloat32,shaderDenormFlushToZeroFloat32>>, <<features-shaderDenormFlushToZeroFloat64,shaderDenormFlushToZeroFloat64>>
| code:SignedZeroInfNanPreserve | <<features-shaderSignedZeroInfNanPreserveFloat16,shaderSignedZeroInfNanPreserveFloat16>>, <<features-shaderSignedZeroInfNanPreserveFloat32,shaderSignedZeroInfNanPreserveFloat32>>, <<features-shaderSignedZeroInfNanPreserveFloat64,shaderSignedZeroInfNanPreserveFloat64>>
| code:RoundingModeRTE | <<features-shaderRoundingModeRTEFloat16,shaderRoundingModeRTEFloat16>>, <<features-shaderRoundingModeRTEFloat32,shaderRoundingModeRTEFloat32>>, <<features-shaderRoundingModeRTEFloat64,shaderRoundingModeRTEFloat64>>
| code:RoundingModeRTZ | <<features-shaderRoundingModeRTZFloat16,shaderRoundingModeRTZFloat16>>, <<features-shaderRoundingModeRTZFloat32,shaderRoundingModeRTZFloat32>>, <<features-shaderRoundingModeRTZFloat64,shaderRoundingModeRTZFloat64>>
endif::VK_KHR_shader_float_controls[]
ifdef::VK_NV_compute_shader_derivatives[]
[[spirvenv-capabilities-table-computederivatives-quads]]
| code:ComputeDerivativeGroupQuadsNV | <<features-computeShaderDerivativesQuads,computeDerivativeGroupQuads>>
[[spirvenv-capabilities-table-computederivatives-linear]]
| code:ComputeDerivativeGroupLinearNV | <<features-computeShaderDerivativesLinear,computeDerivativeGroupLinear>>
endif::VK_NV_compute_shader_derivatives[]
ifdef::VK_NV_fragment_shader_barycentric[]
[[spirvenv-capabilities-fragment-barycentric]]
| code:FragmentBarycentricNV | <<features-fragmentShaderBarycentric,fragmentShaderBarycentric>>
endif::VK_NV_fragment_shader_barycentric[]
ifdef::VK_NV_shader_image_footprint[]
[[spirvenv-capabilities-table-imagefootprint]]
| code:ImageFootprintNV | <<features-imageFootprint,imageFootprint>>
endif::VK_NV_shader_image_footprint[]
ifdef::VK_NV_shading_rate_image[]
| code:ShadingRateImageNV | <<features-shadingRateImage,shadingRateImage>>
endif::VK_NV_shading_rate_image[]
ifdef::VK_NV_mesh_shader[]
[[spirvenv-capabilities-table-meshshading]]
| code:MeshShadingNV | `<<VK_NV_mesh_shader>>`
endif::VK_NV_mesh_shader[]
ifdef::VK_NV_ray_tracing[]
[[spirvenv-capabilities-table-raytracing]]
| code:RayTracingNV | `<<VK_NV_ray_tracing>>`
endif::VK_NV_ray_tracing[]
ifdef::VK_EXT_transform_feedback[]
| code:TransformFeedback | <<features-transformFeedback,transformFeedback>>
| code:GeometryStreams | <<features-geometryStreams,geometryStreams>>
endif::VK_EXT_transform_feedback[]
ifdef::VK_EXT_fragment_density_map[]
[[spirvenv-capabilities-table-fragmentdensity]]
| code:FragmentDensityEXT | <<features-fragmentdensitymap,fragmentDensityMap>>
endif::VK_EXT_fragment_density_map[]
ifdef::VK_EXT_buffer_device_address[]
[[spirvenv-capabilities-table-physicalstoragebufferaddresses]]
| code:PhysicalStorageBufferAddressesEXT | <<features-bufferDeviceAddress,bufferDeviceAddress>>
endif::VK_EXT_buffer_device_address[]
ifdef::VK_NV_cooperative_matrix[]
[[spirvenv-capabilities-table-cooperativeMatrix]]
| code:CooperativeMatrixNV | <<features-cooperativeMatrix,cooperativeMatrix>>
endif::VK_NV_cooperative_matrix[]
ifdef::VK_INTEL_shader_integer_functions2[]
[[spirvenv-capabilities-table-shaderIntegerFunctions2]]
| code:ShaderIntegerFunctions2INTEL | <<features-shaderIntegerFunctions2,shaderIntegerFunctions2>>
endif::VK_INTEL_shader_integer_functions2[]
ifdef::VK_NV_shader_sm_builtins[]
[[spirvenv-capabilities-table-shadersmbuiltins]]
| code:ShaderSMBuiltinsNV | <<features-shadersmbuiltins,shaderSMBuiltins>>
endif::VK_NV_shader_sm_builtins[]
ifdef::VK_EXT_fragment_shader_interlock[]
[[spirvenv-capabilities-table-fragmentShaderInterlock]]
| code:FragmentShaderSampleInterlockEXT | <<features-fragmentShaderSampleInterlock,fragmentShaderSampleInterlock>>
| code:FragmentShaderPixelInterlockEXT | <<features-fragmentShaderPixelInterlock,fragmentShaderPixelInterlock>>
ifdef::VK_NV_shading_rate_image[]
| code:FragmentShaderShadingRateInterlockEXT | <<features-fragmentShaderShadingRateInterlock,fragmentShaderShadingRateInterlock>>, <<features-shadingRateImage,shadingRateImage>>
endif::VK_NV_shading_rate_image[]
endif::VK_EXT_fragment_shader_interlock[]
ifdef::VK_EXT_shader_demote_to_helper_invocation[]
[[spirvenv-capabilities-table-demote]]
| code:DemoteToHelperInvocationEXT | <<features-shaderDemoteToHelperInvocation,shaderDemoteToHelperInvocation>>
endif::VK_EXT_shader_demote_to_helper_invocation[]
|====
ifdef::VK_VERSION_1_1,VK_KHR_variable_pointers[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_KHR_variable_pointers` SPIR-V extension.
endif::VK_VERSION_1_1,VK_KHR_variable_pointers[]
ifdef::VK_AMD_shader_explicit_vertex_parameter[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_AMD_shader_explicit_vertex_parameter` SPIR-V extension.
endif::VK_AMD_shader_explicit_vertex_parameter[]
ifdef::VK_AMD_gcn_shader[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_AMD_gcn_shader` SPIR-V extension.
endif::VK_AMD_gcn_shader[]
ifdef::VK_AMD_gpu_shader_half_float[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_AMD_gpu_shader_half_float` SPIR-V extension.
endif::VK_AMD_gpu_shader_half_float[]
ifdef::VK_AMD_gpu_shader_int16[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_AMD_gpu_shader_int16` SPIR-V extension.
endif::VK_AMD_gpu_shader_int16[]
ifdef::VK_AMD_shader_ballot[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_AMD_shader_ballot` SPIR-V extension.
endif::VK_AMD_shader_ballot[]
ifdef::VK_AMD_shader_fragment_mask[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_AMD_shader_fragment_mask` SPIR-V extension.
endif::VK_AMD_shader_fragment_mask[]
ifdef::VK_AMD_shader_image_load_store_lod[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_AMD_shader_image_load_store_lod` SPIR-V extension.
endif::VK_AMD_shader_image_load_store_lod[]
ifdef::VK_AMD_shader_trinary_minmax[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_AMD_shader_trinary_minmax` SPIR-V extension.
endif::VK_AMD_shader_trinary_minmax[]
ifdef::VK_AMD_texture_gather_bias_lod[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_AMD_texture_gather_bias_lod` SPIR-V extension.
endif::VK_AMD_texture_gather_bias_lod[]
ifdef::VK_VERSION_1_1,VK_KHR_shader_draw_parameters[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_KHR_shader_draw_parameters` SPIR-V extension.
endif::VK_VERSION_1_1,VK_KHR_shader_draw_parameters[]
ifdef::VK_KHR_8bit_storage[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_KHR_8bit_storage` SPIR-V extension.
endif::VK_KHR_8bit_storage[]
ifdef::VK_VERSION_1_1,VK_KHR_16bit_storage[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_KHR_16bit_storage` SPIR-V extension.
endif::VK_VERSION_1_1,VK_KHR_16bit_storage[]
ifdef::VK_KHR_shader_clock[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the {spirv}/KHR/SPV_KHR_shader_clock.html[`SPV_KHR_shader_clock`]
SPIR-V extension.
endif::VK_KHR_shader_clock[]
ifdef::VK_KHR_shader_float_controls[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_KHR_float_controls` SPIR-V extension.
endif::VK_KHR_shader_float_controls[]
ifdef::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_KHR_storage_buffer_storage_class` SPIR-V extension.
endif::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
ifdef::VK_EXT_post_depth_coverage[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_KHR_post_depth_coverage` SPIR-V extension.
endif::VK_EXT_post_depth_coverage[]
ifdef::VK_EXT_shader_stencil_export[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_EXT_shader_stencil_export` SPIR-V extension.
endif::VK_EXT_shader_stencil_export[]
ifdef::VK_EXT_shader_subgroup_ballot[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_KHR_shader_ballot` SPIR-V extension.
endif::VK_EXT_shader_subgroup_ballot[]
ifdef::VK_EXT_shader_subgroup_vote[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_KHR_subgroup_vote` SPIR-V extension.
endif::VK_EXT_shader_subgroup_vote[]
ifdef::VK_NV_sample_mask_override_coverage[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_NV_sample_mask_override_coverage` SPIR-V extension.
endif::VK_NV_sample_mask_override_coverage[]
ifdef::VK_NV_geometry_shader_passthrough[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_NV_geometry_shader_passthrough` SPIR-V extension.
endif::VK_NV_geometry_shader_passthrough[]
ifdef::VK_NV_mesh_shader[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_NV_mesh_shader` SPIR-V extension.
endif::VK_NV_mesh_shader[]
ifdef::VK_NV_viewport_array2[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_NV_viewport_array2` SPIR-V extension.
endif::VK_NV_viewport_array2[]
ifdef::VK_NV_shader_subgroup_partitioned[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_NV_shader_subgroup_partitioned` SPIR-V extension.
endif::VK_NV_shader_subgroup_partitioned[]
ifdef::VK_EXT_shader_viewport_index_layer[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_EXT_shader_viewport_index_layer` SPIR-V extension.
endif::VK_EXT_shader_viewport_index_layer[]
ifdef::VK_NVX_multiview_per_view_attributes[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_NVX_multiview_per_view_attributes` SPIR-V extension.
endif::VK_NVX_multiview_per_view_attributes[]
ifdef::VK_EXT_descriptor_indexing[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_EXT_descriptor_indexing` SPIR-V extension.
endif::VK_EXT_descriptor_indexing[]
ifdef::VK_KHR_vulkan_memory_model[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_KHR_vulkan_memory_model` SPIR-V extension.
endif::VK_KHR_vulkan_memory_model[]
ifdef::VK_NV_compute_shader_derivatives[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_NV_compute_shader_derivatives` SPIR-V extension.
endif::VK_NV_compute_shader_derivatives[]
ifdef::VK_NV_fragment_shader_barycentric[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_NV_fragment_shader_barycentric` SPIR-V extension.
endif::VK_NV_fragment_shader_barycentric[]
ifdef::VK_NV_shader_image_footprint[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_NV_shader_image_footprint` SPIR-V extension.
endif::VK_NV_shader_image_footprint[]
ifdef::VK_NV_shading_rate_image[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_NV_shading_rate` SPIR-V extension.
endif::VK_NV_shading_rate_image[]
ifdef::VK_NV_ray_tracing[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_NV_ray_tracing` SPIR-V extension.
endif::VK_NV_ray_tracing[]
ifdef::VK_GOOGLE_hlsl_functionality1[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_GOOGLE_hlsl_functionality1` SPIR-V extension.
endif::VK_GOOGLE_hlsl_functionality1[]
ifdef::VK_GOOGLE_user_type[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_GOOGLE_user_type` SPIR-V extension.
endif::VK_GOOGLE_user_type[]
ifdef::VK_GOOGLE_decorate_string[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_GOOGLE_decorate_string` SPIR-V extension.
endif::VK_GOOGLE_decorate_string[]
ifdef::VK_EXT_fragment_density_map[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_EXT_fragment_invocation_density` SPIR-V extension.
endif::VK_EXT_fragment_density_map[]
ifdef::VK_EXT_buffer_device_address[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_EXT_physical_storage_buffer` SPIR-V extension.
endif::VK_EXT_buffer_device_address[]
ifdef::VK_NV_cooperative_matrix[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_NV_cooperative_matrix` SPIR-V extension.
endif::VK_NV_cooperative_matrix[]
ifdef::VK_NV_shader_sm_builtins[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_NV_shader_sm_builtins` SPIR-V extension.
endif::VK_NV_shader_sm_builtins[]
ifdef::VK_EXT_fragment_shader_interlock[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_EXT_fragment_shader_interlock` SPIR-V extension.
endif::VK_EXT_fragment_shader_interlock[]
ifdef::VK_EXT_shader_demote_to_helper_invocation[]
The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
uses the `SPV_EXT_demote_to_helper_invocation` SPIR-V extension.
endif::VK_EXT_shader_demote_to_helper_invocation[]
The application must: not pass a SPIR-V module containing any of the
following to flink:vkCreateShaderModule:
* any OpCapability not listed above,
* an unsupported capability, or
* a capability which corresponds to a Vulkan feature or extension which
has not been enabled.
[[spirvenv-module-validation]]
== Validation Rules within a Module
A SPIR-V module passed to flink:vkCreateShaderModule must: conform to the
following rules:
* Every entry point must: have no return value and accept no arguments.
* Recursion: The static function-call graph for an entry point must: not
contain cycles.
* The *Logical* addressing model must: be selected.
* *Scope* for execution must: be limited to:
** *Workgroup*
** *Subgroup*
* *Scope* for memory must: be limited to:
** *Device*
ifdef::VK_KHR_vulkan_memory_model[]
*** If <<features-vulkanMemoryModel,pname:vulkanMemoryModel>> is enabled
and
<<features-vulkanMemoryModelDeviceScope,pname:vulkanMemoryModelDeviceScope>>
is not enabled, *Device* scope must: not be used.
*** If <<features-vulkanMemoryModel,pname:vulkanMemoryModel>> is not
enabled, *Device* scope only extends to the queue family, not the
whole device.
endif::VK_KHR_vulkan_memory_model[]
ifndef::VK_KHR_vulkan_memory_model[]
*** *Device* scope only extends to the queue family, not the whole device.
endif::VK_KHR_vulkan_memory_model[]
ifdef::VK_KHR_vulkan_memory_model[]
** *QueueFamilyKHR*
*** If <<features-vulkanMemoryModel,pname:vulkanMemoryModel>> is not
enabled, *QueueFamilyKHR* must: not be used.
endif::VK_KHR_vulkan_memory_model[]
** *Workgroup*
ifdef::VK_VERSION_1_1[]
** *Subgroup*
endif::VK_VERSION_1_1[]
** *Invocation*
ifdef::VK_VERSION_1_1[]
* *Scope* for *Non Uniform Group Operations* must: be limited to:
** *Subgroup*
endif::VK_VERSION_1_1[]
* *Storage Class* must: be limited to:
** *UniformConstant*
** *Input*
** *Uniform*
** *Output*
** *Workgroup*
** *Private*
** *Function*
** *PushConstant*
** *Image*
ifdef::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
** *StorageBuffer*
endif::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
ifdef::VK_NV_ray_tracing[]
** *RayPayloadNV*
** *IncomingRayPayloadNV*
** *HitAttributeNV*
** *CallableDataNV*
** *IncomingCallableDataNV*
** *ShaderRecordBufferNV*
endif::VK_NV_ray_tracing[]
ifdef::VK_EXT_buffer_device_address[]
** *PhysicalStorageBufferEXT*
endif::VK_EXT_buffer_device_address[]
* Memory semantics must: obey the following rules:
** *Acquire* must: not be used with code:OpAtomicStore.
** *Release* must: not be used with code:OpAtomicLoad.
** *AcquireRelease* must: not be used with code:OpAtomicStore or
code:OpAtomicLoad.
** Sequentially consistent atomics and barriers are not supported and
*SequentiallyConsistent* is treated as *AcquireRelease*.
*SequentiallyConsistent* should: not be used.
** code:OpMemoryBarrier must: use one of *Acquire*, *Release*,
*AcquireRelease*, or *SequentiallyConsistent* and must: include at
least one storage class.
** If the semantics for code:OpControlBarrier includes one of *Acquire*,
*Release*, *AcquireRelease*, or *SequentiallyConsistent*, then it must:
include at least one storage class.
** *SubgroupMemory*, *CrossWorkgroupMemory*, and *AtomicCounterMemory* are
ignored.
ifdef::VK_KHR_shader_float16_int8[]
ifndef::VK_KHR_8bit_storage[]
* Any code:OpVariable with the result type pointing to an 8-bit integer
object or an object containing an 8-bit integer element must: not have
one of the following as its code:Storage code:Class operand:
** *Uniform*
** *PushConstant*
ifdef::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
** *StorageBuffer*
endif::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
endif::VK_KHR_8bit_storage[]
endif::VK_KHR_shader_float16_int8[]
ifdef::VK_KHR_shader_float16_int8[]
ifndef::VK_KHR_16bit_storage[]
* Any code:OpVariable with the result type pointing to a 16-bit
floating-point object or an object containing a 16-bit floating-point
element must: not have one of the following as its code:Storage
code:Class operand:
** *Uniform*
** *PushConstant*
ifdef::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
** *StorageBuffer*
endif::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
endif::VK_KHR_16bit_storage[]
endif::VK_KHR_shader_float16_int8[]
* Any code:OpVariable with an code:Initializer operand must: have one of
the following as its *Storage Class* operand:
** *Output*
** *Private*
** *Function*
ifdef::VK_KHR_shader_clock[]
* Scope for code:OpReadClockKHR must be limited to:
** code:Subgroup
*** if <<features-shaderSubgroupClock,pname:shaderSubgroupClock>> is
not enabled, the code:Subgroup scope must: not be used.
** code:Device
*** if <<features-shaderDeviceClock,pname:shaderDeviceClock>> is not
enabled, the code:Device scope must: not be used.
endif::VK_KHR_shader_clock[]
* The code:OriginLowerLeft execution mode must: not be used; fragment
entry points must: declare code:OriginUpperLeft.
* The code:PixelCenterInteger execution mode must: not be used.
Pixels are always centered at half-integer coordinates.
* Any variable in the code:UniformConstant storage class must: be typed as
either:
** code:OpTypeImage
** code:OpTypeSampler
** code:OpTypeSampledImage
** An array of one of these types.
* Images and Samplers
** code:OpTypeImage must: declare a scalar 32-bit float or 32-bit integer
type for the "`Sampled Type`".
(code:RelaxedPrecision can: be applied to a sampling instruction and to
the variable holding the result of a sampling instruction.)
** If the code:Sampled code:Type of an code:OpTypeImage declaration does
not match the numeric format of the corresponding resource in type, as
shown in the _SPIR-V Sampled Type_ column of the
<<formats-numericformat>> table, the values obtained by reading or
sampling from the image are undefined:.
** If the signedness of any read or sample operation does not match the
signedness of the corresponding resource then the values obtained are
undefined:.
** code:OpTypeImage must: have a "`Sampled`" operand of 1 (sampled image)
or 2 (storage image).
** If
<<features-shaderStorageImageReadWithoutFormat,shaderStorageImageReadWithoutFormat>>
is not enabled and an code:OpTypeImage has "`Image Format`" operand of
code:Unknown, any variables created with the given type must be
decorated with code:NonReadable.
** If
<<features-shaderStorageImageWriteWithoutFormat,shaderStorageImageWriteWithoutFormat>>
is not enabled and an code:OpTypeImage has "`Image Format`" operand of
code:Unknown, any variables created with the given type must be
decorated with code:NonWritable.
** code:OpImageQuerySizeLod, and code:OpImageQueryLevels must: only
consume an "`Image`" operand whose type has its "`Sampled`" operand set
to 1.
** The [eq]#(u,v)# coordinates used for a code:SubpassData must: be the
<id> of a constant vector [eq]#(0,0)#, or if a layer coordinate is
used, must: be a vector that was formed with constant 0 for the [eq]#u#
and [eq]#v# components.
** The "`Depth`" operand of code:OpTypeImage is ignored.
** Objects of types code:OpTypeImage, code:OpTypeSampler,
code:OpTypeSampledImage, and arrays of these types must: not be stored
to or modified.
* Any image operation must: use at most one of the code:Offset,
code:ConstOffset, and code:ConstOffsets image operands.
* Image operand code:Offset must: only be used with
code:OpImage*code:Gather instructions.
* The "`Component`" operand of code:OpImageGather, and
code:OpImageSparseGather must: be the <id> of a constant instruction.
* Structure types must: not contain opaque types.
* Decorations
** Any code:BuiltIn decoration not listed in
<<interfaces-builtin-variables>> must: not be used.
** Any code:BuiltIn decoration that corresponds only to Vulkan features or
extensions that have not been enabled must: not be used.
** The code:GLSLShared and code:GLSLPacked decorations must: not be used.
** The code:Flat, code:NoPerspective, code:Sample, and code:Centroid
decorations must: not be used on variables with storage class other
than code:Input or on variables used in the interface of non-fragment
shader entry points.
** The code:Patch decoration must: not be used on variables in the
interface of a vertex, geometry, or fragment shader stage's entry
point.
ifdef::VK_NV_viewport_array2[]
** The code:ViewportRelativeNV decoration must: only be used on a variable
decorated with code:Layer in the vertex, tessellation evaluation, or
geometry shader stages.
** The code:ViewportRelativeNV decoration must: not be used unless a
variable decorated with one of code:ViewportIndex or
code:ViewportMaskNV is also statically used by the same
code:OpEntryPoint.
** The code:ViewportMaskNV and code:ViewportIndex decorations must: not
both be statically used by one or more code:OpEntryPoint's that form
the vertex processing stages of a graphics pipeline.
endif::VK_NV_viewport_array2[]
ifdef::VK_VERSION_1_1,VK_KHR_16bit_storage[]
** Only the round-to-nearest-even and the round-towards-zero rounding
modes can: be used for the code:FPRoundingMode decoration.
** The code:FPRoundingMode decoration can: only be used for the
floating-point conversion instructions as described in the
{spirv}/KHR/SPV_KHR_16bit_storage.html[`SPV_KHR_16bit_storage`] SPIR-V
extension.
endif::VK_VERSION_1_1,VK_KHR_16bit_storage[]
** code:DescriptorSet and code:Binding decorations must: obey the
constraints on storage class, type, and descriptor type described in
<<interfaces-resources-setandbinding,DescriptorSet and Binding
Assignment>>
** Variables decorated with code:Invariant and variables with structure
types that have any members decorated with code:Invariant must: be in
the code:Output or code:Input storage class.
code:Invariant used on an code:Input storage class variable or
structure member has no effect.
* code:OpTypeRuntimeArray must: only be used for:
** the last member of an code:OpTypeStruct
ifdef::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
that is in the code:StorageBuffer storage class decorated as
code:Block, or
endif::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
ifdef::VK_EXT_buffer_device_address[]
that is in the code:PhysicalStorageBufferEXT storage class decorated as
code:Block, or
endif::VK_EXT_buffer_device_address[]
that is in the code:Uniform storage class decorated as
code:BufferBlock.
ifdef::VK_EXT_descriptor_indexing[]
** If the code:RuntimeDescriptorArrayEXT capability is supported, an array
of variables with storage class code:Uniform,
ifdef::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
code:StorageBuffer,
endif::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
or code:UniformConstant, or for the outermost dimension of an array of
arrays of such variables.
endif::VK_EXT_descriptor_indexing[]
* Linkage: See <<interfaces,Shader Interfaces>> for additional linking and
validation rules.
ifdef::VK_VERSION_1_1[]
* If code:OpControlBarrier is used in fragment, vertex, tessellation
evaluation, or geometry stages, the execution Scope must: be
code:Subgroup.
endif::VK_VERSION_1_1[]
* Compute Shaders
** For each compute shader entry point, either a code:LocalSize execution
mode or an object decorated with the code:WorkgroupSize decoration
must: be specified.
ifdef::VK_NV_compute_shader_derivatives[]
** For compute shaders using the code:DerivativeGroupQuadsNV execution
mode, the first two dimensions of the local workgroup size must: be a
multiple of two.
** For compute shaders using the code:DerivativeGroupLinearNV execution
mode, the product of the dimensions of the local workgroup size must:
be a multiple of four.
endif::VK_NV_compute_shader_derivatives[]
ifdef::VK_VERSION_1_1[]
* "`Result Type`" for *Non Uniform Group Operations* must: be limited to
32-bit floating-point, 32-bit integer, boolean, or vectors of these
types.
** If the code:Float64 capability is enabled, 64-bit floating-point and
vector of 64-bit floating-point types are also permitted.
ifdef::VK_KHR_shader_subgroup_extended_types[]
** If the code:Int8 capability is enabled and the
<<features-subgroup-extended-types,shaderSubgroupExtendedTypes>>
feature is ename:VK_TRUE, 8-bit integer and vector of 8-bit integer
types are also permitted.
** If the code:Int16 capability is enabled and the
<<features-subgroup-extended-types,shaderSubgroupExtendedTypes>>
feature is ename:VK_TRUE, 16-bit integer and vector of 16-bit integer
types are also permitted.
** If the code:Int64 capability is enabled and the
<<features-subgroup-extended-types,shaderSubgroupExtendedTypes>>
feature is ename:VK_TRUE, 64-bit integer and vector of 64-bit integer
types are also permitted.
** If the code:Float16 capability is enabled and the
<<features-subgroup-extended-types,shaderSubgroupExtendedTypes>>
feature is ename:VK_TRUE, 16-bit floating-point and vector of 16-bit
floating-point types are also permitted.
endif::VK_KHR_shader_subgroup_extended_types[]
* The "`Id`" operand of code:OpGroupNonUniformBroadcast must: be the <id>
of a constant instruction.
* If code:OpGroupNonUniformBallotBitCount is used, the group operation
must: be one of:
** *Reduce*
** *InclusiveScan*
** *ExclusiveScan*
endif::VK_VERSION_1_1[]
* Atomic instructions must: declare a scalar 32-bit integer type,
ifdef::VK_KHR_shader_atomic_int64[]
or a scalar 64-bit integer type if the code:Int64Atomics capability is
enabled,
endif::VK_KHR_shader_atomic_int64[]
for the value pointed to by _Pointer_.
ifdef::VK_KHR_shader_atomic_int64[]
** <<features-shaderBufferInt64Atomics,shaderBufferInt64Atomics>> must: be
enabled for 64-bit integer atomic operations to be supported on a
_Pointer_ with a *Storage Class* of
ifdef::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
*StorageBuffer* or
endif::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
*Uniform*.
** <<features-shaderSharedInt64Atomics,shaderSharedInt64Atomics>> must: be
enabled for 64-bit integer atomic operations to be supported on a
_Pointer_ with a *Storage Class* of *Workgroup*.
endif::VK_KHR_shader_atomic_int64[]
* The _Pointer_ operand of all atomic instructions must: have a *Storage
Class* limited to:
** *Uniform*
** *Workgroup*
** *Image*
ifdef::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
** *StorageBuffer*
endif::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
ifdef::VK_EXT_descriptor_indexing[]
* If an instruction loads from or stores to a resource (including atomics
and image instructions) and the resource descriptor being accessed is
not dynamically uniform, then the operand corresponding to that resource
(e.g. the pointer or sampled image operand) must: be decorated with
code:NonUniformEXT.
endif::VK_EXT_descriptor_indexing[]
ifdef::VK_KHR_shader_float_controls[]
* If
<<features-denormBehaviorIndependence,pname:denormBehaviorIndependence>>
is ename:VK_SHADER_FLOAT_CONTROLS_INDEPENDENCE_32_BIT_ONLY_KHR, then the
entry point must: use the same denormals execution mode for both 16-bit
and 64-bit floating-point types.
* If
<<features-denormBehaviorIndependence,pname:denormBehaviorIndependence>>
is ename:VK_SHADER_FLOAT_CONTROLS_INDEPENDENCE_NONE_KHR, then the entry
point must: use the same denormals execution mode for all floating-point
types.
* If <<features-roundingModeIndependence,pname:roundingModeIndependence>>
is ename:VK_SHADER_FLOAT_CONTROLS_INDEPENDENCE_32_BIT_ONLY_KHR, then the
entry point must: use the same rounding execution mode for both 16-bit
and 64-bit floating-point types.
* If <<features-roundingModeIndependence,pname:roundingModeIndependence>>
is ename:VK_SHADER_FLOAT_CONTROLS_INDEPENDENCE_NONE_KHR, then the entry
point must: use the same rounding execution mode for all floating-point
types.
* If
<<features-shaderSignedZeroInfNanPreserveFloat16,pname:shaderSignedZeroInfNanPreserveFloat16>>
is ename:VK_FALSE, then code:SignedZeroInfNanPreserve for 16-bit
floating-point type must: not be used.
* If
<<features-shaderSignedZeroInfNanPreserveFloat32,pname:shaderSignedZeroInfNanPreserveFloat32>>
is ename:VK_FALSE, then code:SignedZeroInfNanPreserve for 32-bit
floating-point type must: not be used.
* If
<<features-shaderSignedZeroInfNanPreserveFloat64,pname:shaderSignedZeroInfNanPreserveFloat64>>
is ename:VK_FALSE, then code:SignedZeroInfNanPreserve for 64-bit
floating-point type must: not be used.
* If
<<features-shaderDenormPreserveFloat16,pname:shaderDenormPreserveFloat16>>
is ename:VK_FALSE, then code:DenormPreserve for 16-bit floating-point
type must: not be used.
* If
<<features-shaderDenormPreserveFloat32,pname:shaderDenormPreserveFloat32>>
is ename:VK_FALSE, then code:DenormPreserve for 32-bit floating-point
type must: not be used.
* If
<<features-shaderDenormPreserveFloat64,pname:shaderDenormPreserveFloat64>>
is ename:VK_FALSE, then code:DenormPreserve for 64-bit floating-point
type must: not be used.
* If
<<features-shaderDenormFlushToZeroFloat16,pname:shaderDenormFlushToZeroFloat16>>
is ename:VK_FALSE, then code:DenormFlushToZero for 16-bit floating-point
type must: not be used.
* If
<<features-shaderDenormFlushToZeroFloat32,pname:shaderDenormFlushToZeroFloat32>>
is ename:VK_FALSE, then code:DenormFlushToZero for 32-bit floating-point
type must: not be used.
* If
<<features-shaderDenormFlushToZeroFloat64,pname:shaderDenormFlushToZeroFloat64>>
is ename:VK_FALSE, then code:DenormFlushToZero for 64-bit floating-point
type must: not be used.
* If
<<features-shaderRoundingModeRTEFloat16,pname:shaderRoundingModeRTEFloat16>>
is ename:VK_FALSE, then code:RoundingModeRTE for 16-bit floating-point
type must: not be used.
* If
<<features-shaderRoundingModeRTEFloat32,pname:shaderRoundingModeRTEFloat32>>
is ename:VK_FALSE, then code:RoundingModeRTE for 32-bit floating-point
type must: not be used.
* If
<<features-shaderRoundingModeRTEFloat64,pname:shaderRoundingModeRTEFloat64>>
is ename:VK_FALSE, then code:RoundingModeRTE for 64-bit floating-point
type must: not be used.
* If
<<features-shaderRoundingModeRTZFloat16,pname:shaderRoundingModeRTZFloat16>>
is ename:VK_FALSE, then code:RoundingModeRTZ for 16-bit floating-point
type must: not be used.
* If
<<features-shaderRoundingModeRTZFloat32,pname:shaderRoundingModeRTZFloat32>>
is ename:VK_FALSE, then code:RoundingModeRTZ for 32-bit floating-point
type must: not be used.
* If
<<features-shaderRoundingModeRTZFloat64,pname:shaderRoundingModeRTZFloat64>>
is ename:VK_FALSE, then code:RoundingModeRTZ for 64-bit floating-point
type must: not be used.
endif::VK_KHR_shader_float_controls[]
ifdef::VK_EXT_transform_feedback[]
* The code:Offset plus size of the type of each variable, in the output
interface of the entry point being compiled, decorated with
code:XfbBuffer must: not be greater than
sname:VkPhysicalDeviceTransformFeedbackPropertiesEXT::pname:maxTransformFeedbackBufferDataSize
* For any given code:XfbBuffer value, define the buffer data size to be
smallest number of bytes such that, for all outputs decorated with the
same code:XfbBuffer value, the size of the output interface variable
plus the code:Offset is less than or equal to the buffer data size.
For a given code:Stream, the sum of all the buffer data sizes for all
buffers writing to that stream the must: not exceed
sname:VkPhysicalDeviceTransformFeedbackPropertiesEXT::pname:maxTransformFeedbackStreamDataSize
* Output variables or block members decorated with code:Offset that have a
64-bit type, or a composite type containing a 64-bit type, must: specify
an code:Offset value aligned to a 8 byte boundary
* Any output block or block member decorated with code:Offset containing a
64-bit type consumes a multiple of 8 bytes
* The size of any output block containing any member decorated with
code:Offset that is a 64-bit type must: be a multiple of 8
* The first member of an output block that specifies a code:Offset
decoration must: specify a code:Offset value that is aligned to an 8
byte boundary if that block contains any member decorated with
code:Offset and is a 64-bit type
* Output variables or block members decorated with code:Offset that have a
32-bit type, or a composite type contains a 32-bit type, must: specify
an code:Offset value aligned to a 4 byte boundary
* Output variables, blocks or block members decorated with code:Offset
must: only contain base types that have components that are either
32-bit or 64-bit in size
* The Stream value to code:OpEmitStreamVertex and
code:OpEndStreamPrimitive must: be less than
sname:VkPhysicalDeviceTransformFeedbackPropertiesEXT::pname:maxTransformFeedbackStreams
* If the geometry shader emits to more than one vertex stream and
sname:VkPhysicalDeviceTransformFeedbackPropertiesEXT::pname:transformFeedbackStreamsLinesTriangles
is ename:VK_FALSE, then execution mode must: be code:OutputPoints
* Only variables or block members in the output interface decorated with
code:Offset can: be captured for transform feedback, and those variables
or block memebers must: also be decorated with code:XfbBuffer and
code:XfbStride, or inherit code:XfbBuffer and code:XfbStride decorations
from a block containing them
* All variables or block members in the output interface of the entry
point being compiled decorated with a specific code:XfbBuffer value
must: all be decorated with identical code:XfbStride values
* If any variables or block members in the output interface of the entry
point being compiled are decorated with code:Stream, then all variables
belonging to the same code:XfbBuffer must specify the same code:Stream
value
* Output variables, blocks or block members that are not decorated with
code:Stream default to vertex stream zero
* For any two variables or block members in the output interface of the
entry point being compiled with the same code:XfbBuffer value, the
ranges determined by the code:Offset decoration and the size of the type
must: not overlap
* The stream number value to code:Stream must: be less than
sname:VkPhysicalDeviceTransformFeedbackPropertiesEXT::pname:maxTransformFeedbackStreams
* The XFB Stride value to code:XfbStride must be less than or equal to
sname:VkPhysicalDeviceTransformFeedbackPropertiesEXT::pname:maxTransformFeedbackBufferDataStride
endif::VK_EXT_transform_feedback[]
ifdef::VK_NV_ray_tracing[]
* code:RayPayloadNV storage class must: only be used in ray generation,
any-hit, closest hit or miss shaders.
* code:IncomingRayPayloadNV storage class must: only be used in closest
hit, any-hit, or miss shaders.
* code:HitAttributeNV storage class must: only be used in intersection,
any-hit, or closest hit shaders.
* code:CallableDataNV storage class must: only be used in ray generation,
closest hit, miss, and callable shaders.
* code:IncomingCallableDataNV storage class must only be used in callable
shaders.
endif::VK_NV_ray_tracing[]
ifdef::VK_VERSION_1_1,VK_KHR_variable_pointers,VK_EXT_buffer_device_address[]
* The code:Base operand of code:OpPtrAccessChain must: point to one of the
following storage classes:
ifdef::VK_VERSION_1_1,VK_KHR_variable_pointers[]
** *Workgroup*, if code:VariablePointers is enabled.
** *StorageBuffer*, if code:VariablePointers or
code:VariablePointersStorageBuffer is enabled.
endif::VK_VERSION_1_1,VK_KHR_variable_pointers[]
** *PhysicalStorageBufferEXT*, if the code:PhysicalStorageBuffer64EXT
addressing model is enabled.
endif::VK_VERSION_1_1,VK_KHR_variable_pointers,VK_EXT_buffer_device_address[]
ifdef::VK_EXT_buffer_device_address[]
* If the code:PhysicalStorageBuffer64EXT addressing model is enabled:
** Any load or store through a physical pointer type must: be aligned to a
multiple of the size of the largest scalar type in the pointed-to type.
** All instructions that support memory access operands and that use a
physical pointer must: include the code:Aligned operand.
** The pointer value of a memory access instruction must be at least as
aligned as specified by the code:Aligned memory access operand.
** Any access chain instruction that accesses into a code:RowMajor matrix
must: only be used as the code:Pointer operand to code:OpLoad or
code:OpStore.
** code:OpConvertUToPtr and code:OpConvertPtrToU must: use an integer type
whose code:Width is 64.
endif::VK_EXT_buffer_device_address[]
ifdef::VK_NV_cooperative_matrix[]
* For code:OpCooperativeMatrixLoadNV and code:OpCooperativeMatrixStoreNV
instructions, the code:Pointer and code:Stride operands must: be aligned
to at least the lesser of 16 bytes or the natural alignment of a row or
column (depending on code:ColumnMajor) of the matrix (where the natural
alignment is the number of columns/rows multiplied by the component
size).
* For code:OpTypeCooperativeMatrixNV, the component type, scope, number of
rows, and number of columns must: match one of the matrices in any of
the supported slink:VkCooperativeMatrixPropertiesNV.
* For code:OpCooperativeMatrixMulAddNV, the code:Result, code:A, code:B,
and code:C matrices must: all have types that satisfy the same supported
slink:VkCooperativeMatrixPropertiesNV.
That is, for one supported supported
slink:VkCooperativeMatrixPropertiesNV, all of the following must: hold:
** The type of code:A must have pname:MSize rows and pname:KSize columns
and have a component type that matches pname:AType.
** The type of code:B must have pname:KSize rows and pname:NSize columns
and have a component type that matches pname:BType.
** The type of code:C must have pname:MSize rows and pname:NSize columns
and have a component type that matches pname:CType.
** The type of code:Result must have pname:MSize rows and pname:NSize
columns and have a component type that matches pname:DType.
** The type of code:A, code:B, code:C, and code:Result must all have a
scope of pname:scope.
* code:OpTypeCooperativeMatrixNV and code:OpCooperativeMatrix*
instructions must: not be used in shader stages not included in
slink:VkPhysicalDeviceCooperativeMatrixPropertiesNV::pname:cooperativeMatrixSupportedStages.
endif::VK_NV_cooperative_matrix[]
[[spirvenv-precision-operation]]
== Precision and Operation of SPIR-V Instructions
The following rules apply to half, single, and double-precision floating
point instructions:
* Positive and negative infinities and positive and negative zeros are
generated as dictated by <<ieee-754,IEEE 754>>, but subject to the
precisions allowed in the following table.
* Dividing a non-zero by a zero results in the appropriately signed
<<ieee-754,IEEE 754>> infinity.
* Signaling [eq]##NaN##s are not required to be generated and exceptions
are never raised.
Signaling [eq]##NaN## may: be converted to quiet [eq]##NaN##s values by
any floating point instruction.
* The following instructions must: not flush denormalized values:
code:OpConstant, code:OpConstantComposite, code:OpSpecConstant,
code:OpSpecConstantComposite, code:OpLoad, code:OpStore, code:OpBitcast,
code:OpPhi, code:OpSelect, code:OpFunctionCall, code:OpReturnValue,
code:OpVectorExtractDynamic, code:OpVectorInsertDynamic,
code:OpVectorShuffle, code:OpCompositeConstruct,
code:OpCompositeExtract, code:OpCompositeInsert, code:OpCopyMemory,
code:OpCopyObject.
ifndef::VK_KHR_shader_float_controls[]
* Any denormalized value input into a shader or potentially generated by
any instruction in a shader (except those listed above) may: be flushed
to 0.
* The rounding mode cannot: be set, and results will be
<<spirvenv-correctly-rounded, correctly rounded>>, as described below.
* [eq]##NaN##s may: not be generated.
Instructions that operate on a [eq]#NaN# may: not result in a [eq]#NaN#.
endif::VK_KHR_shader_float_controls[]
ifdef::VK_KHR_shader_float_controls[]
* By default, the implementation may: perform optimizations on half,
single, or double-precision floating-point instructions respectively
that ignore sign of a zero, or assume that arguments and results are not
[eq]##Nan##s or latexmath:[\pm\infty], this does not apply to
code:OpIsNan and code:OpIsInf, which must: always correctly detect
[eq]##Nan##s and latexmath:[\pm\infty].
If the entry point is declared with the code:SignedZeroInfNanPreserve
execution mode, then sign of a zero, [eq]##Nan##s, and
latexmath:[\pm\infty] must: not be ignored.
** The following core SPIR-V instructions must: respect the
code:SignedZeroInfNanPreserve execution mode: code:OpPhi,
code:OpSelect, code:OpReturnValue, code:OpVectorExtractDynamic,
code:OpVectorInsertDynamic, code:OpVectorShuffle,
code:OpCompositeConstruct, code:OpCompositeExtract,
code:OpCompositeInsert, code:OpCopyObject, code:OpTranspose,
code:OpFConvert, code:OpFNegate, code:OpFAdd, code:OpFSub, code:OpFMul,
code:OpStore.
This execution mode must: also be respected by code:OpLoad except for
loads from the code:Input storage class in the fragment shader stage
with the floating-point result type.
Other SPIR-V instructions may: also respect the
code:SignedZeroInfNanPreserve execution mode.
* Denormalized values are supported.
** By default, any half, single, or double-precision denormalized value
input into a shader or potentially generated by any instruction (except
those listed above) or any extended instructions for GLSL in a shader
may: be flushed to zero.
** If the entry point is declared with the code:DenormFlushToZero
execution mode then for the affected instuctions the denormalized
result must: be flushed to zero and the denormalized operands may: be
flushed to zero.
Denormalized values obtained via unpacking an integer into a vector of
values with smaller bit width and interpreting those values as
floating-point numbers must: be flushed to zero.
** The following core SPIR-V instructions must: respect the
code:DenormFlushToZero execution mode: code:OpSpecConstantOp (with
opcode code:OpFConvert), code:OpFConvert, code:OpFNegate, code:OpFAdd,
code:OpFSub, code:OpFMul, code:OpFDiv, code:OpFRem, code:OpFMod,
code:OpVectorTimesScalar, code:OpMatrixTimesScalar,
code:OpVectorTimesMatrix, code:OpMatrixTimesVector,
code:OpMatrixTimesMatrix, code:OpOuterProduct, code:OpDot; and the
following extended instructions for GLSL: code:Round, code:RoundEven,
code:Trunc, code:FAbs, code:Floor, code:Ceil, code:Fract, code:Radians,
code:Degrees, code:Sin, code:Cos, code:Tan, code:Asin, code:Acos,
code:Atan, code:Sinh, code:Cosh, code:Tanh, code:Asinh, code:Acosh,
code:Atanh, code:Atan2, code:Pow, code:Exp, code:Log, code:Exp2,
code:Log2, code:Sqrt, code:InverseSqrt, code:Determinant,
code:MatrixInverse, code:Modf, code:ModfStruct, code:FMin, code:FMax,
code:FClamp, code:FMix, code:Step, code:SmoothStep, code:Fma,
code:UnpackHalf2x16, code:UnpackDouble2x32, code:Length, code:Distance,
code:Cross, code:Normalize, code:FaceForward, code:Reflect,
code:Refract, code:NMin, code:NMax, code:NClamp.
Other SPIR-V instructions (except those excluded above) may: also flush
denormalized values.
** The following core SPIR-V instructions must: respect the
code:DenormPreserve execution mode: code:OpTranspose,
code:OpSpecConstantOp, code:OpFConvert, code:OpFNegate, code:OpFAdd,
code:OpFSub, code:OpFMul, code:OpVectorTimesScalar,
code:OpMatrixTimesScalar, code:OpVectorTimesMatrix,
code:OpMatrixTimesVector, code:OpMatrixTimesMatrix,
code:OpOuterProduct, code:OpDot, code:OpFOrdEqual, code:OpFUnordEqual,
code:OpFOrdNotEqual, code:OpFUnordNotEqual, code:OpFOrdLessThan,
code:OpFUnordLessThan, code:OpFOrdGreaterThan,
code:OpFUnordGreaterThan, code:OpFOrdLessThanEqual,
code:OpFUnordLessThanEqual, code:OpFOrdGreaterThanEqual,
code:OpFUnordGreaterThanEqual; and the following extended instructions
for GLSL: code:FAbs, code:FSign, code:Radians, code:Degrees, code:FMin,
code:FMax, code:FClamp, code:FMix, code:Fma, code:PackHalf2x16,
code:PackDouble2x32, code:UnpackHalf2x16, code:UnpackDouble2x32,
code:NMin, code:NMax, code:NClamp.
Other SPIR-V instructions may: also preserve denorm values.
endif::VK_KHR_shader_float_controls[]
The precision of double-precision instructions is at least that of single
precision.
The precision of operations is defined either in terms of rounding, as an
error bound in ULP, or as inherited from a formula as follows.
[[spirvenv-correctly-rounded]]
.Correctly Rounded
Operations described as "`correctly rounded`" will return the infinitely
precise result, [eq]#x#, rounded so as to be representable in
floating-point.
ifdef::VK_KHR_shader_float_controls[]
The rounding mode is not specified, unless the entry point is declared with
the code:RoundingModeRTE or the code:RoundingModeRTZ execution mode.
These execution modes affect only correctly rounded SPIR-V instructions.
These execution modes do not affect code:OpQuantizeToF16.
If the rounding mode is not specified then this rounding is implementation
specific, subject to the following rules.
endif::VK_KHR_shader_float_controls[]
ifndef::VK_KHR_shader_float_controls[]
The rounding mode used is not defined but must: obey the following rules.
endif::VK_KHR_shader_float_controls[]
If [eq]#x# is exactly representable then [eq]#x# will be returned.
Otherwise, either the floating-point value closest to and no less than
[eq]#x# or the value closest to and no greater than [eq]#x# will be
returned.
.ULP
Where an error bound of [eq]#n# ULP (units in the last place) is given, for
an operation with infinitely precise result #x# the value returned must: be
in the range #[x - n * ulp(x), x {plus} n * ulp(x)]#.
The function #ulp(x)# is defined as follows:
{empty}:: If there exist non-equal floating-point numbers #a# and #b# such
that [eq]#a {leq} x {leq} b# then #ulp(x)# is the minimum possible
distance between such numbers, latexmath:[ulp(x) = \mathrm{min}_{a,b} |
b - a |].
If such numbers do not exist then #ulp(x)# is defined to be the
difference between the two finite floating-point numbers nearest to #x#.
Where the range of allowed return values includes any value of magnitude
larger than that of the largest representable finite floating-point number,
operations may:, additionally, return either an infinity of the appropriate
sign or the finite number with the largest magnitude of the appropriate
sign.
If the infinitely precise result of the operation is not mathematically
defined then the value returned is undefined:.
.Inherited From ...
Where an operation's precision is described as being inherited from a
formula, the result returned must be at least as accurate as the result of
computing an approximation to [eq]#x# using a formula equivalent to the
given formula applied to the supplied inputs.
Specifically, the formula given may be transformed using the mathematical
associativity, commutativity and distributivity of the operators involved to
yield an equivalent formula.
The SPIR-V precision rules, when applied to each such formula and the given
input values, define a range of permitted values.
If [eq]#NaN# is one of the permitted values then the operation may return
any result, otherwise let the largest permitted value in any of the ranges
be [eq]#F~max~# and the smallest be [eq]#F~min~#.
The operation must return a value in the range [eq]#[x - E, x {plus} E]#
where latexmath:[E = \mathrm{max} \left( | x - F_{\mathrm{min}} |, | x -
F_{\mathrm{max}} | \right) ].
ifdef::VK_KHR_shader_float_controls[]
If the entry point is declared with the code:DenormFlushToZero execution
mode, then any intermediate denormal value(s) while evaluating the formula
may: be flushed to zero.
Denormal final results must: be flushed to zero.
If the entry point is declared with the code:DenormPreserve execution mode,
then denormals must: be preserved throughout the formula.
endif::VK_KHR_shader_float_controls[]
ifdef::VK_KHR_shader_float16_int8[]
For half- (16 bit) and single- (32 bit) precision instructions, precisions
are required: to be at least as follows:
.Precision of core SPIR-V Instructions
[options="header", cols=",,"]
|====
| Instruction
| Single precision, unless decorated with RelaxedPrecision | Half precision
| code:OpFAdd
2+| Correctly rounded.
| code:OpFSub
2+| Correctly rounded.
| code:OpFMul, code:OpVectorTimesScalar, code:OpMatrixTimesScalar
2+| Correctly rounded.
| code:OpDot(x, y)
2+a| Inherited from latexmath:[\sum_{i = 0}^{n - 1} x_{i} \times y_{i}].
| code:OpFOrdEqual, code:OpFUnordEqual
2+| Correct result.
| code:OpFOrdLessThan, code:OpFUnordLessThan
2+| Correct result.
| code:OpFOrdGreaterThan, code:OpFUnordGreaterThan
2+| Correct result.
| code:OpFOrdLessThanEqual, code:OpFUnordLessThanEqual
2+| Correct result.
| code:OpFOrdGreaterThanEqual, code:OpFUnordGreaterThanEqual
2+| Correct result.
| code:OpFDiv(x,y)
| 2.5 ULP for [eq]#{vert}y{vert}# in the range [2^-126^, 2^126^]. | 2.5 ULP for [eq]#{vert}y{vert}# in the range [2^-14^, 2^14^].
| code:OpFRem(x,y)
2+| Inherited from [eq]#x - y {times} trunc(x/y)#.
| code:OpFMod(x,y)
2+| Inherited from [eq]#x - y {times} floor(x/y)#.
| conversions between types
2+| Correctly rounded.
|====
[NOTE]
.Note
====
The code:OpFRem and code:OpFMod instructions use cheap approximations of
remainder, and the error can be large due to the discontinuity in trunc()
and floor().
This can produce mathematically unexpected results in some cases, such as
FMod(x,x) computing x rather than 0, and can also cause the result to have a
different sign than the infinitely precise result.
====
.Precision of GLSL.std.450 Instructions
[options="header", cols=",,"]
|====
|Instruction
| Single precision, unless decorated with RelaxedPrecision | Half precision
| code:fma()
2+| Inherited from code:OpFMul followed by code:OpFAdd.
| code:exp(x), code:exp2(x)
a| latexmath:[3 + 2 \times \vert x \vert] ULP. a| latexmath:[1 + 2 \times \vert x \vert] ULP.
| code:log(), code:log2()
a| 3 ULP outside the range latexmath:[[0.5, 2.0\]]. Absolute error < latexmath:[2^{-21}] inside the range latexmath:[[0.5, 2.0\]].
a| 3 ULP outside the range latexmath:[[0.5, 2.0\]]. Absolute error < latexmath:[2^{-7}] inside the range latexmath:[[0.5, 2.0\]].
| code:pow(x, y)
2+| Inherited from code:exp2(y {times} code:log2(x)).
| code:sqrt()
2+| Inherited from 1.0 / code:inversesqrt().
| code:inversesqrt()
2+| 2 ULP.
| code:radians(x)
2+a| Inherited from latexmath:[x \times \frac{\pi}{180}].
| code:degrees(x)
2+a| Inherited from latexmath:[x \times \frac{180}{\pi}].
| code:sin()
a| Absolute error latexmath:[\leq 2^{-11}] inside the range latexmath:[[-\pi, \pi\]]. a| Absolute error latexmath:[\leq 2^{-7}] inside the range latexmath:[[-\pi, \pi\]].
| code:cos()
a| Absolute error latexmath:[\leq 2^{-11}] inside the range latexmath:[[-\pi, \pi\]]. a| Absolute error latexmath:[\leq 2^{-7}] inside the range latexmath:[[-\pi, \pi\]].
| code:tan()
2+a| Inherited from latexmath:[\frac{\sin()}{\cos()}].
| code:asin(x)
2+a| Inherited from latexmath:[\mathrm{atan2}(x, sqrt(1.0 - x \times x))].
| code:acos(x)
2+a| Inherited from latexmath:[\mathrm{atan2}(sqrt(1.0 - x \times x), x)].
| code:atan(), code:atan2()
| 4096 ULP | 5 ULP.
| code:sinh(x)
2+a| Inherited from latexmath:[(\exp(x) - \exp(-x)) \times 0.5].
| code:cosh(x)
2+a| Inherited from latexmath:[(\exp(x) + \exp(-x)) \times 0.5].
| code:tanh()
2+a| Inherited from latexmath:[\frac{\sinh()}{\cosh()}].
| code:asinh(x)
2+a| Inherited from latexmath:[\log(x + sqrt(x \times x + 1.0))].
| code:acosh(x)
2+a| Inherited from latexmath:[\log(x + sqrt(x \times x - 1.0))].
| code:atanh(x)
2+a| Inherited from latexmath:[\log(\frac{1.0 + x}{1.0 - x}) \times 0.5].
| code:frexp()
2+| Correctly rounded.
| code:ldexp()
2+| Correctly rounded.
| code:length(x)
2+a| Inherited from latexmath:[sqrt(dot(x, x))].
| code:distance(x, y)
2+a| Inherited from latexmath:[length(x - y)].
| code:cross()
2+| Inherited from [eq]#code:OpFSub(code:OpFMul, code:OpFMul)#.
| code:normalize(x)
2+a| Inherited from latexmath:[\frac{x}{length(x)}].
| code:faceforward(N, I, NRef)
2+| Inherited from [eq]#code:dot(NRef, I) < 0.0 ? N : -N#.
| code:reflect(x, y)
2+| Inherited from [eq]#x - 2.0 {times} code:dot(y, x) {times} y#.
| code:refract(I, N, eta)
2+| Inherited from [eq]#k < 0.0 ? 0.0 : eta {times} I - (eta {times} code:dot(N, I) {plus} code:sqrt(k)) {times} N#, where [eq]#k = 1 - eta {times} eta {times} (1.0 - code:dot(N, I) {times} code:dot(N, I))#.
| code:round
2+| Correctly rounded.
| code:roundEven
2+| Correctly rounded.
| code:trunc
2+| Correctly rounded.
| code:fabs
2+| Correctly rounded.
| code:fsign
2+| Correctly rounded.
| code:floor
2+| Correctly rounded.
| code:ceil
2+| Correctly rounded.
| code:fract
2+| Correctly rounded.
| code:modf
2+| Correctly rounded.
| code:fmin
2+| Correctly rounded.
| code:fmax
2+| Correctly rounded.
| code:fclamp
2+| Correctly rounded.
| code:fmix(x, y, a)
2+a| Inherited from latexmath:[x \times (1.0 - a) + y \times a].
| code:step
2+| Correctly rounded.
| code:smoothStep(edge0, edge1, x)
2+a| Inherited from latexmath:[t \times t \times (3.0 - 2.0 \times t)],
where latexmath:[t = clamp(\frac{x - edge0}{edge1 - edge0}, 0.0, 1.0)].
| code:nmin
2+| Correctly rounded.
| code:nmax
2+| Correctly rounded.
| code:nclamp
2+| Correctly rounded.
|====
endif::VK_KHR_shader_float16_int8[]
ifndef::VK_KHR_shader_float16_int8[]
For single precision (32 bit) instructions, precisions are required: to be
at least as follows, unless decorated with RelaxedPrecision:
.Precision of core SPIR-V Instructions
[options="header"]
|====
| Instruction | Precision
| code:OpFAdd | Correctly rounded.
| code:OpFSub | Correctly rounded.
| code:OpFMul, code:OpVectorTimesScalar, code:OpMatrixTimesScalar | Correctly rounded.
| code:OpFOrdEqual, code:OpFUnordEqual | Correct result.
| code:OpFOrdLessThan, code:OpFUnordLessThan | Correct result.
| code:OpFOrdGreaterThan, code:OpFUnordGreaterThan | Correct result.
| code:OpFOrdLessThanEqual, code:OpFUnordLessThanEqual | Correct result.
| code:OpFOrdGreaterThanEqual, code:OpFUnordGreaterThanEqual | Correct result.
| code:OpFDiv(x,y) | 2.5 ULP for [eq]#{vert}y{vert}# in the range [2^-126^, 2^126^].
| conversions between types | Correctly rounded.
|====
.Precision of GLSL.std.450 Instructions
[options="header"]
|====
|Instruction | Precision
| code:fma() | Inherited from code:OpFMul followed by code:OpFAdd.
| code:exp(x), code:exp2(x) | [eq]#3 {plus} 2 {times} {vert}x{vert}# ULP.
| code:log(), code:log2() | 3 ULP outside the range [eq]#[0.5, 2.0]#. Absolute error < [eq]#2^-21^# inside the range [eq]#[0.5, 2.0]#.
| code:pow(x, y) | Inherited from code:exp2(y {times} code:log2(x)).
| code:sqrt() | Inherited from 1.0 / code:inversesqrt().
| code:inversesqrt() | 2 ULP.
|====
endif::VK_KHR_shader_float16_int8[]
GLSL.std.450 extended instructions specifically defined in terms of the
above instructions inherit the above errors.
GLSL.std.450 extended instructions not listed above and not defined in terms
of the above have undefined: precision.
For the code:OpSRem and code:OpSMod instructions, if either operand is
negative the result is undefined:.
[NOTE]
.Note
====
While the code:OpSRem and code:OpSMod instructions are supported by the
Vulkan environment, they require non-negative values and thus do not enable
additional functionality beyond what code:OpUMod provides.
====
ifdef::VK_NV_cooperative_matrix[]
code:OpCooperativeMatrixMulAddNV performs its operations in an
implementation-dependent order and internal precision.
endif::VK_NV_cooperative_matrix[]
[[spirvenv-image-formats]]
== Compatibility Between SPIR-V Image Formats And Vulkan Formats
Images which are read from or written to by shaders must: have SPIR-V image
formats compatible with the Vulkan image formats backing the image under the
circumstances described for <<textures-operation-validation,texture image
validation>>.
The compatibile formats are:
.SPIR-V and Vulkan Image Format Compatibility
[cols="2*", options="header"]
|====
|SPIR-V Image Format |Compatible Vulkan Format
|code:Rgba32f |ename:VK_FORMAT_R32G32B32A32_SFLOAT
|code:Rgba16f |ename:VK_FORMAT_R16G16B16A16_SFLOAT
|code:R32f |ename:VK_FORMAT_R32_SFLOAT
|code:Rgba8 |ename:VK_FORMAT_R8G8B8A8_UNORM
|code:Rgba8Snorm |ename:VK_FORMAT_R8G8B8A8_SNORM
|code:Rg32f |ename:VK_FORMAT_R32G32_SFLOAT
|code:Rg16f |ename:VK_FORMAT_R16G16_SFLOAT
|code:R11fG11fB10f |ename:VK_FORMAT_B10G11R11_UFLOAT_PACK32
|code:R16f |ename:VK_FORMAT_R16_SFLOAT
|code:Rgba16 |ename:VK_FORMAT_R16G16B16A16_UNORM
|code:Rgb10A2 |ename:VK_FORMAT_A2B10G10R10_UNORM_PACK32
|code:Rg16 |ename:VK_FORMAT_R16G16_UNORM
|code:Rg8 |ename:VK_FORMAT_R8G8_UNORM
|code:R16 |ename:VK_FORMAT_R16_UNORM
|code:R8 |ename:VK_FORMAT_R8_UNORM
|code:Rgba16Snorm |ename:VK_FORMAT_R16G16B16A16_SNORM
|code:Rg16Snorm |ename:VK_FORMAT_R16G16_SNORM
|code:Rg8Snorm |ename:VK_FORMAT_R8G8_SNORM
|code:R16Snorm |ename:VK_FORMAT_R16_SNORM
|code:R8Snorm |ename:VK_FORMAT_R8_SNORM
|code:Rgba32i |ename:VK_FORMAT_R32G32B32A32_SINT
|code:Rgba16i |ename:VK_FORMAT_R16G16B16A16_SINT
|code:Rgba8i |ename:VK_FORMAT_R8G8B8A8_SINT
|code:R32i |ename:VK_FORMAT_R32_SINT
|code:Rg32i |ename:VK_FORMAT_R32G32_SINT
|code:Rg16i |ename:VK_FORMAT_R16G16_SINT
|code:Rg8i |ename:VK_FORMAT_R8G8_SINT
|code:R16i |ename:VK_FORMAT_R16_SINT
|code:R8i |ename:VK_FORMAT_R8_SINT
|code:Rgba32ui |ename:VK_FORMAT_R32G32B32A32_UINT
|code:Rgba16ui |ename:VK_FORMAT_R16G16B16A16_UINT
|code:Rgba8ui |ename:VK_FORMAT_R8G8B8A8_UINT
|code:R32ui |ename:VK_FORMAT_R32_UINT
|code:Rgb10a2ui |ename:VK_FORMAT_A2B10G10R10_UINT_PACK32
|code:Rg32ui |ename:VK_FORMAT_R32G32_UINT
|code:Rg16ui |ename:VK_FORMAT_R16G16_UINT
|code:Rg8ui |ename:VK_FORMAT_R8G8_UINT
|code:R16ui |ename:VK_FORMAT_R16_UINT
|code:R8ui |ename:VK_FORMAT_R8_UINT
|====
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