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e958791a01
* First public update for Vulkan 1.1.
Github Issues:
* Refer to standard sparse image block shape format tables explicitly in
the <<sparsememory-standard-shapes, Standard Sparse Image Block Shapes>>
section (public issue 93).
* Add the missing definition of the code:LocalInvocationIndex decoration
in the <<interfaces-builtin-variables, Built-In Variables>> section
(public issue 532).
* Clarify dynamic state definition in the introduction to the <<pipelines,
Pipelines>> section and the new <<pipelines-dynamic-state, Dynamic
State>> subsection (public issue 620).
* Clarified deprecation statement in the `VK_AMD_negative_viewport_height`
appendix (public issue 674).
* Fix parameter descriptions for flink:vkCreateIndirectCommandsLayoutNVX
(public issue 677).
Internal Issues:
* Remove description of <<primsrast-points, rasterization point size>>
being taken from the tessellation control shader, since there are no
circumstances under which you can have TCS without TES (internal issue
522).
* Define <<copies-images-format-size-compatibility, _size-compatible_
image formats>> for flink:vkCmdCopyImage, add it to the glossary, and
use that definition for slink:VkImageViewCreateInfo (internal issue
771).
* Change brief descriptions of enumerant names, and of parameters which
are enumerants, from "`enum *indicates*`" to "`enum *specifies*`" for
consistency, and add a markup style guide rule (internal issue 862).
* Clarify how execution dependencies interact with
<<synchronization-submission-order, submission order>> at numerous
places in the <<renderpass, Render Pass>> and <<synchronization,
Synchronization>> chapters (internal issue 1062).
* Clarify statement in the <<interfaces-resources-setandbinding,
DescriptorSet and Binding Assignment>> section that only interface
variables statically used by the entry point used in a pipeline must be
present in the descriptor set layout (internal issue 1172).
* Flip sparse image diagrams with partially full mip levels vertically, to
match graph origins of other image diagrams (internal issue 1176).
* Update new SVG diagrams to have consistent style and base font size,
increase consistency of primitive topology diagrams, and add a section
to the style guide on creating and editing images in a consistent style
(internal issue 1177).
* Resolve problems with valid usage statement extraction by fixing
existing VUID tags for interfaces promoted to version 1.1 and fixing
conditional directives around
VUID-VkMemoryDedicatedAllocateInfo-image-01797 (internal issue 1184).
* Strip `KHR` suffixes from a few interfaces promoted to Vulkan 1.1 that
were missed previously (internal issue 1185).
* Restrict code:OpImageQuerySizeLod and code:OpImageQueryLevels to only
work on code:Image operands with their code:Sampled operand set to 1. In
other words, these operations are not defined to work with storage
images (internal issue 1193).
* Recycle extension slot for extension #82 in `vk.xml`. This extension was
never published (internal issue 1195).
* Add an issue to the `VK_KHR_maintenance1` appendix noting that zero
height viewports are allowed when this extension is enabled (internal
issue 1202).
* Fix slink:VkDescriptorSetLayoutBinding description so that shader stages
always use descriptor bindings, not the other way around (internal issue
1206).
* Fix field name for
slink:VkInputAttachmentAspectReference::pname:inputAttachmentIndex
(internal issue 1210).
Other Issues:
* Fix a few broken links in the <<versions-1.1, Version 1.1>> appendix.
* Replace a few old refBegin/refEnd tags with open block markup around
interfaces, and remove old KHX VUID tags that were breaking the valid
usage statement extraction.
* Fix error codes accidentally tagged as success codes in `vk.xml` for
flink:vkGetSwapchainCounterEXT.
* Added valid usage statements for ftext:vkBind*Memory2 input structures
stext:VkBind*MemoryInfo, and fix a pname:image -> pname:buffer typo in a
couple of places.
* Fix swapped descriptions of elink:VkDescriptorType enums
ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE and
ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE (reported via tweet).
New Extensions:
* `VK_ANDROID_external_memory_android_hardware_buffer`
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// Copyright (c) 2015-2018 Khronos Group. This work is licensed under a
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// Creative Commons Attribution 4.0 International License; see
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// http://creativecommons.org/licenses/by/4.0/
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[appendix]
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[[spirvenv]]
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= Vulkan Environment for SPIR-V
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Shaders for Vulkan are defined by the <<spirv-spec,Khronos SPIR-V
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Specification>> as well as the <<spirv-extended,Khronos SPIR-V Extended
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Instructions for GLSL>> Specification.
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This appendix defines additional SPIR-V requirements applying to Vulkan
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shaders.
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== Versions and Formats
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ifdef::VK_VERSION_1_1[]
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A Vulkan 1.1 implementation must: support the 1.0, 1.1, 1.2, and 1.3
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versions of SPIR-V and the 1.0 version of the SPIR-V Extended Instructions
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for GLSL.
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endif::VK_VERSION_1_1[]
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ifndef::VK_VERSION_1_1[]
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A Vulkan 1.0 implementation must: support the 1.0 version of SPIR-V and the
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1.0 version of the SPIR-V Extended Instructions for GLSL.
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endif::VK_VERSION_1_1[]
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A SPIR-V module passed into flink:vkCreateShaderModule is interpreted as a
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series of 32-bit words in host endianness, with literal strings packed as
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described in section 2.2 of the SPIR-V Specification.
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The first few words of the SPIR-V module must: be a magic number and a
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SPIR-V version number, as described in section 2.3 of the SPIR-V
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Specification.
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[[spirvenv-capabilities]]
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== Capabilities
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Implementations must: support the following capability operands declared by
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code:OpCapability:
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* code:Matrix
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* code:Shader
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* code:InputAttachment
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* code:Sampled1D
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* code:Image1D
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* code:SampledBuffer
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* code:ImageBuffer
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* code:ImageQuery
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* code:DerivativeControl
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ifdef::VK_VERSION_1_1,VK_KHR_device_group[]
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* code:DeviceGroup
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endif::VK_VERSION_1_1,VK_KHR_device_group[]
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ifdef::VK_VERSION_1_1,VK_KHR_multiview[]
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* code:MultiView
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endif::VK_VERSION_1_1,VK_KHR_multiview[]
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If the implementation supports any of the optional: features described in
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the <<features-features,Features>> chapter, then the capability operand(s)
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corresponding to that feature must: also be supported.
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[[spirvenv-capabilities-table]]
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.List of optional: SPIR-V Capabilities and corresponding feature or extension names
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[options="header"]
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|====
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| SPIR-V OpCapability | Vulkan feature or extension name
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| code:Geometry | <<features-features-geometryShader,geometryShader>>
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| code:Tessellation | <<features-features-tessellationShader,tessellationShader>>
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| code:Float64 | <<features-features-shaderFloat64,shaderFloat64>>
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| code:Int64 | <<features-features-shaderInt64,shaderInt64>>
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| code:Int16 | <<features-features-shaderInt16,shaderInt16>>
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| code:TessellationPointSize | <<features-features-shaderTessellationAndGeometryPointSize,shaderTessellationAndGeometryPointSize>>
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| code:GeometryPointSize | <<features-features-shaderTessellationAndGeometryPointSize,shaderTessellationAndGeometryPointSize>>
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| code:ImageGatherExtended | <<features-features-shaderImageGatherExtended,shaderImageGatherExtended>>
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| code:StorageImageMultisample | <<features-features-shaderStorageImageMultisample,shaderStorageImageMultisample>>
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| code:UniformBufferArrayDynamicIndexing | <<features-features-shaderUniformBufferArrayDynamicIndexing,shaderUniformBufferArrayDynamicIndexing>>
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| code:SampledImageArrayDynamicIndexing | <<features-features-shaderSampledImageArrayDynamicIndexing,shaderSampledImageArrayDynamicIndexing>>
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| code:StorageBufferArrayDynamicIndexing | <<features-features-shaderStorageBufferArrayDynamicIndexing,shaderStorageBufferArrayDynamicIndexing>>
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| code:StorageImageArrayDynamicIndexing | <<features-features-shaderStorageImageArrayDynamicIndexing,shaderStorageImageArrayDynamicIndexing>>
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| code:ClipDistance | <<features-features-shaderClipDistance,shaderClipDistance>>
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| code:CullDistance | <<features-features-shaderCullDistance,shaderCullDistance>>
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| code:ImageCubeArray | <<features-features-imageCubeArray,imageCubeArray>>
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| code:SampleRateShading | <<features-features-sampleRateShading,sampleRateShading>>
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| code:SparseResidency | <<features-features-shaderResourceResidency,shaderResourceResidency>>
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| code:MinLod | <<features-features-shaderResourceMinLod,shaderResourceMinLod>>
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| code:SampledCubeArray | <<features-features-imageCubeArray,imageCubeArray>>
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| code:ImageMSArray | <<features-features-shaderStorageImageMultisample,shaderStorageImageMultisample>>
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| code:StorageImageExtendedFormats | <<features-features-shaderStorageImageExtendedFormats,shaderStorageImageExtendedFormats>>
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| code:InterpolationFunction | <<features-features-sampleRateShading,sampleRateShading>>
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| code:StorageImageReadWithoutFormat | <<features-features-shaderStorageImageReadWithoutFormat,shaderStorageImageReadWithoutFormat>>
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| code:StorageImageWriteWithoutFormat | <<features-features-shaderStorageImageWriteWithoutFormat,shaderStorageImageWriteWithoutFormat>>
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| code:MultiViewport | <<features-features-multiViewport,multiViewport>>
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ifdef::VK_VERSION_1_1,VK_KHR_shader_draw_parameters[]
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| code:DrawParameters
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| `<<VK_KHR_shader_draw_parameters>>`
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ifdef::VK_VERSION_1_1[]
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or <<features-features-shaderDrawParameters,shaderDrawParameters>>
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endif::VK_VERSION_1_1[]
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endif::VK_VERSION_1_1,VK_KHR_shader_draw_parameters[]
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ifndef::VK_VERSION_1_1[]
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ifdef::VK_KHR_multiview[]
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| code:MultiView | <<VK_KHR_multiview,VK_KHR_multiview>>
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endif::VK_KHR_multiview[]
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ifdef::VK_KHR_device_group[]
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| code:DeviceGroup | <<VK_KHR_device_group,VK_KHR_device_group>>
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endif::VK_KHR_device_group[]
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endif::VK_VERSION_1_1[]
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ifdef::VK_VERSION_1_1,VK_KHR_variable_pointers[]
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[[spirvenv-capabilities-table-variablepointers]]
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| code:VariablePointersStorageBuffer | <<features-features-variablePointersStorageBuffer,variablePointersStorageBuffer>>
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| code:VariablePointers | <<features-features-variablePointers,variablePointers>>
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endif::VK_VERSION_1_1,VK_KHR_variable_pointers[]
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ifdef::VK_EXT_shader_stencil_export[]
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[[spirvenv-capabilities-table-shaderstencilexportext]]
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| code:StencilExportEXT | `<<VK_EXT_shader_stencil_export>>`
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endif::VK_EXT_shader_stencil_export[]
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ifdef::VK_EXT_shader_subgroup_ballot[]
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[[spirvenv-capabilities-table-subgroupballot]]
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| code:SubgroupBallotKHR | `<<VK_EXT_shader_subgroup_ballot>>`
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endif::VK_EXT_shader_subgroup_ballot[]
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ifdef::VK_EXT_shader_subgroup_vote[]
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[[spirvenv-capabilities-table-subgroupvote]]
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| code:SubgroupVoteKHR | `<<VK_EXT_shader_subgroup_vote>>`
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endif::VK_EXT_shader_subgroup_vote[]
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ifdef::VK_AMD_shader_image_load_store_lod[]
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[[spirvenv-capabilities-table-imagereadwritelodamd]]
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| code:ImageReadWriteLodAMD | `<<VK_AMD_shader_image_load_store_lod>>`
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endif::VK_AMD_shader_image_load_store_lod[]
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ifdef::VK_AMD_texture_gather_bias_lod[]
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[[spirvenv-capabilities-table-imagegatherbiaslodamd]]
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| code:ImageGatherBiasLodAMD | `<<VK_AMD_texture_gather_bias_lod>>`
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endif::VK_AMD_texture_gather_bias_lod[]
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ifdef::VK_AMD_shader_fragment_mask[]
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[[spirvenv-capabilities-table-fragmentmaskamd]]
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| code:FragmentMaskAMD | `<<VK_AMD_shader_fragment_mask>>`
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endif::VK_AMD_shader_fragment_mask[]
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ifdef::VK_NV_sample_mask_override_coverage[]
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[[spirvenv-capabilities-table-samplemaskoverridecoverage]]
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| code:SampleMaskOverrideCoverageNV | `<<VK_NV_sample_mask_override_coverage>>`
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endif::VK_NV_sample_mask_override_coverage[]
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ifdef::VK_NV_geometry_shader_passthrough[]
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[[spirvenv-capabilities-table-geometryshaderpassthrough]]
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| code:GeometryShaderPassthroughNV | `<<VK_NV_geometry_shader_passthrough>>`
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endif::VK_NV_geometry_shader_passthrough[]
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ifdef::VK_EXT_shader_viewport_index_layer[]
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[[spirvenv-capabilities-table-shader-viewport-index-layer]]
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| code:ShaderViewportIndexLayerEXT | `<<VK_EXT_shader_viewport_index_layer>>`
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endif::VK_EXT_shader_viewport_index_layer[]
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ifdef::VK_NV_viewport_array2[]
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[[spirvenv-capabilities-table-viewportarray2]]
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| code:ShaderViewportIndexLayerNV | `<<VK_NV_viewport_array2>>`
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| code:ShaderViewportMaskNV | `<<VK_NV_viewport_array2>>`
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endif::VK_NV_viewport_array2[]
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ifdef::VK_NVX_multiview_per_view_attributes[]
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[[spirvenv-capabilities-table-perviewattributes]]
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| code:PerViewAttributesNV | `<<VK_NVX_multiview_per_view_attributes>>`
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endif::VK_NVX_multiview_per_view_attributes[]
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ifdef::VK_VERSION_1_1,VK_KHR_16bit_storage[]
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[[spirvenv-capabilities-table-16bitstorage]]
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| code:StorageBuffer16BitAccess | <<features-features-storageBuffer16BitAccess, StorageBuffer16BitAccess>>
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| code:UniformAndStorageBuffer16BitAccess | <<features-features-uniformAndStorageBuffer16BitAccess,UniformAndStorageBuffer16BitAccess>>
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| code:StoragePushConstant16 | <<features-features-storagePushConstant16,storagePushConstant16>>
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| code:StorageInputOutput16 | <<features-features-storageInputOutput16,storageInputOutput16>>
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endif::VK_VERSION_1_1,VK_KHR_16bit_storage[]
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ifdef::VK_VERSION_1_1[]
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[[spirvenv-capabilities-table-subgroup]]
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| code:GroupNonUniform | <<features-features-subgroup-basic,VK_SUBGROUP_FEATURE_BASIC_BIT>>
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| code:GroupNonUniformVote | <<features-features-subgroup-vote,VK_SUBGROUP_FEATURE_VOTE_BIT>>
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| code:GroupNonUniformArithmetic | <<features-features-subgroup-arithmetic,VK_SUBGROUP_FEATURE_ARITHMETIC_BIT>>
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| code:GroupNonUniformBallot | <<features-features-subgroup-ballot,VK_SUBGROUP_FEATURE_BALLOT_BIT>>
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| code:GroupNonUniformShuffle | <<features-features-subgroup-shuffle,VK_SUBGROUP_FEATURE_SHUFFLE_BIT>>
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| code:GroupNonUniformShuffleRelative | <<features-features-subgroup-shuffle-relative,VK_SUBGROUP_FEATURE_SHUFFLE_RELATIVE_BIT>>
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| code:GroupNonUniformClustered | <<features-features-subgroup-clustered,VK_SUBGROUP_FEATURE_CLUSTERED_BIT>>
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| code:GroupNonUniformQuad | <<features-features-subgroup-quad,VK_SUBGROUP_FEATURE_QUAD_BIT>>
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endif::VK_VERSION_1_1[]
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ifdef::VK_EXT_post_depth_coverage[]
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[[spirvenv-capabilities-table-postdepthcoverage]]
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| code:SampleMaskPostDepthCoverage | `<<VK_EXT_post_depth_coverage>>`
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endif::VK_EXT_post_depth_coverage[]
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|====
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ifdef::VK_VERSION_1_1,VK_KHR_variable_pointers[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_KHR_variable_pointers` SPIR-V extension.
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endif::VK_VERSION_1_1,VK_KHR_variable_pointers[]
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ifdef::VK_AMD_shader_explicit_vertex_parameter[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_AMD_shader_explicit_vertex_parameter` SPIR-V extension.
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endif::VK_AMD_shader_explicit_vertex_parameter[]
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ifdef::VK_AMD_gcn_shader[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_AMD_gcn_shader` SPIR-V extension.
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endif::VK_AMD_gcn_shader[]
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ifdef::VK_AMD_gpu_shader_half_float[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_AMD_gpu_shader_half_float` SPIR-V extension.
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endif::VK_AMD_gpu_shader_half_float[]
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ifdef::VK_AMD_gpu_shader_int16[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_AMD_gpu_shader_int16` SPIR-V extension.
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endif::VK_AMD_gpu_shader_int16[]
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ifdef::VK_AMD_shader_ballot[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_AMD_shader_ballot` SPIR-V extension.
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endif::VK_AMD_shader_ballot[]
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ifdef::VK_AMD_shader_fragment_mask[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_AMD_shader_fragment_mask` SPIR-V extension.
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endif::VK_AMD_shader_fragment_mask[]
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ifdef::VK_AMD_shader_image_load_store_lod[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_AMD_shader_image_load_store_lod` SPIR-V extension.
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endif::VK_AMD_shader_image_load_store_lod[]
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ifdef::VK_AMD_shader_trinary_minmax[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_AMD_shader_trinary_minmax` SPIR-V extension.
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endif::VK_AMD_shader_trinary_minmax[]
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ifdef::VK_AMD_texture_gather_bias_lod[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_AMD_texture_gather_bias_lod` SPIR-V extension.
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endif::VK_AMD_texture_gather_bias_lod[]
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ifdef::VK_VERSION_1_1,VK_KHR_shader_draw_parameters[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_KHR_shader_draw_parameters` SPIR-V extension.
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endif::VK_VERSION_1_1,VK_KHR_shader_draw_parameters[]
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ifdef::VK_VERSION_1_1,VK_KHR_16bit_storage[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the
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https://www.khronos.org/registry/spir-v/extensions/KHR/SPV_KHR_16bit_storage.html[`SPV_KHR_16bit_storage`]
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SPIR-V extension.
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endif::VK_VERSION_1_1,VK_KHR_16bit_storage[]
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ifdef::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the
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https://www.khronos.org/registry/spir-v/extensions/KHR/SPV_KHR_storage_buffer_storage_class.html[`SPV_KHR_storage_buffer_storage_class`]
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SPIR-V extension.
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endif::VK_VERSION_1_1,VK_KHR_storage_buffer_storage_class[]
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ifdef::VK_EXT_post_depth_coverage[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_KHR_post_depth_coverage` SPIR-V extension.
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endif::VK_EXT_post_depth_coverage[]
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ifdef::VK_EXT_shader_stencil_export[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_EXT_shader_stencil_export` SPIR-V extension.
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endif::VK_EXT_shader_stencil_export[]
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ifdef::VK_EXT_shader_subgroup_ballot[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_KHR_shader_ballot` SPIR-V extension.
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endif::VK_EXT_shader_subgroup_ballot[]
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ifdef::VK_EXT_shader_subgroup_vote[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_KHR_subgroup_vote` SPIR-V extension.
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endif::VK_EXT_shader_subgroup_vote[]
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ifdef::VK_NV_sample_mask_override_coverage[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_NV_sample_mask_override_coverage` SPIR-V extension.
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endif::VK_NV_sample_mask_override_coverage[]
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ifdef::VK_NV_geometry_shader_passthrough[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_NV_geometry_shader_passthrough` SPIR-V extension.
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endif::VK_NV_geometry_shader_passthrough[]
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ifdef::VK_NV_viewport_array2[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_NV_viewport_array2` SPIR-V extension.
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endif::VK_NV_viewport_array2[]
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ifdef::VK_EXT_shader_viewport_index_layer[]
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The application can: pass a SPIR-V module to flink:vkCreateShaderModule that
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uses the `SPV_EXT_shader_viewport_index_layer` SPIR-V extension.
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endif::VK_EXT_shader_viewport_index_layer[]
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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[]
|
|
|
|
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*
|
|
** *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[]
|
|
* 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.
|
|
* Any code:OpVariable with an code:Initializer operand must: have one of
|
|
the following as its code:Storage code:Class operand:
|
|
** *Output*
|
|
** *Private*
|
|
** *Function*
|
|
* 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.
|
|
* Images
|
|
** 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.)
|
|
** code:OpSampledImage, 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.
|
|
* Decorations
|
|
** 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-to-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
|
|
https://www.khronos.org/registry/spir-v/extensions/KHR/SPV_KHR_16bit_storage.html[`SPV_KHR_16bit_storage`]
|
|
SPIR-V extension.
|
|
endif::VK_VERSION_1_1,VK_KHR_16bit_storage[]
|
|
* 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[]
|
|
that is in the code:Uniform storage class decorated as code:BufferBlock.
|
|
* 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_VERSION_1_1[]
|
|
* "`Result Type`" for *Non Uniform Group Operations* must: be limited to
|
|
32-bit float, 32-bit integer, boolean, or vectors of these types.
|
|
If the code:Float64 capability is enabled, double and vector of double
|
|
types are also permitted.
|
|
* "`Mask`" for code:OpGroupNonUniformShuffleXor must: be a specialization
|
|
constant or a constant, or if the dynamic instance is called within a
|
|
loop construct it must: be one of:
|
|
. A specialization constant.
|
|
. A constant.
|
|
. An arthimetic operation whose operands are 1., 2., or 4.
|
|
. A phi node whose operands are 1., 2., or 3.
|
|
* 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 for the
|
|
_Result Type_ and the type of the value pointed to by _Pointer_.
|
|
|
|
|
|
[[spirvenv-precision-operation]]
|
|
== Precision and Operation of SPIR-V Instructions
|
|
|
|
The following rules apply to both 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.
|
|
* Any denormalized value input into a shader or potentially generated by
|
|
any instruction in a shader may: be flushed to 0.
|
|
* The rounding mode cannot: be set and is undefined.
|
|
* [eq]##NaN##s may: not be generated.
|
|
Instructions that operate on a [eq]#NaN# may: not result in a [eq]#NaN#.
|
|
* Support for signaling [eq]##NaN##s is optional: and exceptions are never
|
|
raised.
|
|
|
|
The precision of double-precision instructions is at least that of single
|
|
precision.
|
|
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 | 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 | 2.5 ULP for b 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.
|
|
|====
|
|
|
|
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.
|
|
These include, for example, the trigonometric functions and determinant.
|
|
|
|
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.
|
|
====
|
|
|
|
|
|
[[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
|
|
|====
|