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Vulkan-Docs/doc/specs/vulkan/appendices/spirvenv.txt
Jon Leech b9e9296cd8 Change log for June 24, 2017 Vulkan 1.0.53 spec update: 
* Bump API patch number and header version number to 53 for this update.

Github Issues:

Internal Issues:

  * Clarify mappings of coordinates for mutable, compatible image views in
    slink:VkImageViewCreateInfo (internal issue 815).
  * Make ename:VK_BIND_SFR_BIT require a logical device with multiple
    physical devices, so that standard sparse image block dimensions are
    only required on systems that support multi-GPU (internal issue 835).
  * Convert all files from use of // refBegin .. // refEnd comments to
    delimit ref pages, to use of open blocks, and update style guide
    accordingly (internal issue 839).
  * Add valid usage for slink:VkWriteDescriptorSet when performing updates
    to a ename:VK_STORAGE_IMAGE descriptor with layout
    ename:VK_IMAGE_LAYOUT_GENERAL.
  * Add a hack to the validity generator script to support an odd
    interaction between flink:vkCmdFillBuffer and an extension (internal
    issue 853).
  * Remove redundant text describing slink:VkBufferCreateInfo::pname:usage,
    which was already covered by implicit valid usage (internal issue 854).
  * Update implicit validity generator script to properly handle the
    pname:sType and pname:pNext members of "returnedonly" structures
    (internal issue 874).
  * Note that slink:VkApplicationInfo::pname:pApplicationName &
    slink:VkApplicationInfo::pname:pEngineName are optional, and add missing
    implicit valid usage statements for flink:vkDestroyInstance.
  * Added missing valid usage for flink:vkCmdWriteTimestamp to require a
    timestamp query pool.
  * Simplify and/or split "`non-atomic`" valid usage statements.

New Extensions:

  * `VK_AMD_gpu_shader_int16`
  * `VK_EXT_blend_operation_advanced`
  * `VK_EXT_sampler_filter_minmax`
  * `VK_NV_framebuffer_mixed_samples`

-----------------------------------------------------
Note: the 1.0.52 spec wasn't published on github, so the 1.0.53 release
combines both change sets.
-----------------------------------------------------

Change log for June 13, 2017 Vulkan 1.0.52 spec update:

  * Bump API patch number and header version number to 52 for this update.

Github Issues:

Internal Issues:

  * Clarify behavior when non-coherent memory has
    <<memory-device-unmap-does-not-flush, not been flushed before being
    unmapped>> (internal issue 819).
  * Fix description of code:WorkgroupSize builtin to note it decorates an
    object, not a variable (internal issue 836).
  * Fix asciidoc attributes so that trailing '{plus}' symbols in [eq] style
    equations are rendered properly (internal issue 845).
  * Add language to the "`Extension Handles, Objects, Enums, and Typedefs`"
    section of the Procedures and Conventions document stating that any new
    handle type requires a corresponding entry in the elink:VkObjectType
    enumerated type (internal issue 856).
  * Update style guide to use slink macro for Vulkan handle type names, and
    define narrow conditions under which to use the *name and *text macros
    instead of *link (internal issue 886).
  * Add a dependency of the <<VK_KHX_device_group,VK_KHX_device_group>>
    extension on VK_KHX_device_group_creation to +vk.xml+ and the extension
    appendix.
  * Change the copyright on Vulkan specification asciidoc *source* files to
    CC-BY 4.0, and update the proprietary Khronos copyright applied to the
    generated *output* formats (internal issue 327). This enables broader
    re-use and modification of the Vulkan specification sources, while not
    affecting the Reciprocal IP License between Vulkan Adopters and Working
    Group Members.

New Extensions:

  * `VK_NV_fill_rectangle`
  * `VK_NV_fragment_coverage_to_color`
2017-06-26 19:32:10 -07:00

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// Copyright (c) 2015-2017 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.
== Required Versions and Formats
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.
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
Implementations must: support the following capability operands declared by
code:OpCapability:
* code:Matrix
* code:Shader
* code:InputAttachment
* code:Sampled1D
* code:Image1D
* code:SampledBuffer
* code:ImageBuffer
* code:ImageQuery
* code:DerivativeControl
Implementations may: support features that are not required: by the
Specification, as described in the <<features-features,Features>> chapter.
If such a feature is supported, then any capability operand(s) corresponding
to that feature must: also be supported.
[[spirvenv-capabilities-table]]
.SPIR-V Capabilities which are not required:, and corresponding feature or extension names
[options="header"]
|====
| SPIR-V OpCapability | Vulkan feature or extension name
| code:Geometry | <<features-features-geometryShader,geometryShader>>
| code:Tessellation | <<features-features-tessellationShader,tessellationShader>>
| code:Float64 | <<features-features-shaderFloat64,shaderFloat64>>
| code:Int64 | <<features-features-shaderInt64,shaderInt64>>
| code:Int16 | <<features-features-shaderInt16,shaderInt16>>
| code:TessellationPointSize | <<features-features-shaderTessellationAndGeometryPointSize,shaderTessellationAndGeometryPointSize>>
| code:GeometryPointSize | <<features-features-shaderTessellationAndGeometryPointSize,shaderTessellationAndGeometryPointSize>>
| code:ImageGatherExtended | <<features-features-shaderImageGatherExtended,shaderImageGatherExtended>>
| code:StorageImageMultisample | <<features-features-shaderStorageImageMultisample,shaderStorageImageMultisample>>
| code:UniformBufferArrayDynamicIndexing | <<features-features-shaderUniformBufferArrayDynamicIndexing,shaderUniformBufferArrayDynamicIndexing>>
| code:SampledImageArrayDynamicIndexing | <<features-features-shaderSampledImageArrayDynamicIndexing,shaderSampledImageArrayDynamicIndexing>>
| code:StorageBufferArrayDynamicIndexing | <<features-features-shaderStorageBufferArrayDynamicIndexing,shaderStorageBufferArrayDynamicIndexing>>
| code:StorageImageArrayDynamicIndexing | <<features-features-shaderStorageImageArrayDynamicIndexing,shaderStorageImageArrayDynamicIndexing>>
| code:ClipDistance | <<features-features-shaderClipDistance,shaderClipDistance>>
| code:CullDistance | <<features-features-shaderCullDistance,shaderCullDistance>>
| code:ImageCubeArray | <<features-features-imageCubeArray,imageCubeArray>>
| code:SampleRateShading | <<features-features-sampleRateShading,sampleRateShading>>
| code:SparseResidency | <<features-features-shaderResourceResidency,shaderResourceResidency>>
| code:MinLod | <<features-features-shaderResourceMinLod,shaderResourceMinLod>>
| code:SampledCubeArray | <<features-features-imageCubeArray,imageCubeArray>>
| code:ImageMSArray | <<features-features-shaderStorageImageMultisample,shaderStorageImageMultisample>>
| code:StorageImageExtendedFormats | <<features-features-shaderStorageImageExtendedFormats,shaderStorageImageExtendedFormats>>
| code:InterpolationFunction | <<features-features-sampleRateShading,sampleRateShading>>
| code:StorageImageReadWithoutFormat | <<features-features-shaderStorageImageReadWithoutFormat,shaderStorageImageReadWithoutFormat>>
| code:StorageImageWriteWithoutFormat | <<features-features-shaderStorageImageWriteWithoutFormat,shaderStorageImageWriteWithoutFormat>>
| code:MultiViewport | <<features-features-multiViewport,multiViewport>>
ifdef::VK_KHR_shader_draw_parameters[]
[[spirvenv-capabilities-table-drawparameters]]
| code:DrawParameters | <<VK_KHR_shader_draw_parameters,VK_KHR_shader_draw_parameters>>
endif::VK_KHR_shader_draw_parameters[]
ifdef::VK_EXT_shader_subgroup_ballot[]
[[spirvenv-capabilities-table-subgroupballot]]
| code:SubgroupBallotKHR | <<VK_EXT_shader_subgroup_ballot,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,VK_EXT_shader_subgroup_vote>>
endif::VK_EXT_shader_subgroup_vote[]
ifdef::VK_KHX_multiview[]
[[spirvenv-capabilities-table-multiview]]
| code:MultiView | <<VK_KHX_multiview,VK_KHX_multiview>>
endif::VK_KHX_multiview[]
ifdef::VK_KHX_device_group[]
[[spirvenv-capabilities-table-devicegroup]]
| code:DeviceGroup | <<VK_KHX_device_group,VK_KHX_device_group>>
endif::VK_KHX_device_group[]
ifdef::VK_AMD_texture_gather_bias_lod[]
[[spirvenv-capabilities-table-imagegatherbiaslodamd]]
| code:ImageGatherBiasLodAMD | <<VK_AMD_texture_gather_bias_lod,VK_AMD_texture_gather_bias_lod>>
endif::VK_AMD_texture_gather_bias_lod[]
ifdef::VK_NV_sample_mask_override_coverage[]
[[spirvenv-capabilities-table-samplemaskoverridecoverage]]
| code:SampleMaskOverrideCoverageNV | <<VK_NV_sample_mask_override_coverage,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,VK_NV_geometry_shader_passthrough>>
endif::VK_NV_geometry_shader_passthrough[]
ifdef::VK_NV_viewport_array2[]
[[spirvenv-capabilities-table-viewportarray2]]
| code:ShaderViewportIndexLayerNV | <<VK_NV_viewport_array2,VK_NV_viewport_array2>>
| code:ShaderViewportMaskNV | <<VK_NV_viewport_array2,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,VK_NVX_multiview_per_view_attributes>>
endif::VK_NVX_multiview_per_view_attributes[]
|====
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_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_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_KHR_shader_draw_parameters[]
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_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_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*
** *Invocation*
* Variables declared in the *UniformConstant* storage class must: not have
initializers.
* 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 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[]
* code:OpTypeRuntimeArray must: only be used for the last member of an
code:OpTypeStruct that is in the code:Uniform storage class and is
decorated as code:BufferBlock.
* Linkage: See <<interfaces,Shader Interfaces>> for additional linking and
validation rules.
* 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.
* Atomic instructions must: declare a scalar 32-bit integer type for the
"`Result Type`".
[[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
|====
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