skia / external / github.com / KhronosGroup / OpenGL-Registry / d15191e446614fcec3369577495dfb45b131a27a / . / extensions / KHR / KHR_shader_subgroup.txt

Name | |

KHR_shader_subgroup | |

Name Strings | |

GL_KHR_shader_subgroup | |

Contact | |

Daniel Koch, NVIDIA Corportation | |

Contributors | |

Neil Henning, Codeplay | |

Contributors to GL_KHR_shader_subgroup (GLSL) | |

James Glanville, Imagination | |

Jan-Harald Fredriksen, Arm | |

Graeme Leese, Broadcom | |

Jesse Hall, Google | |

Status | |

Complete | |

Approved by the OpenGL Working Group on 2019-05-29 | |

Approved by the OpenGL ES Working Group on 2019-05-29 | |

Approved by the Khronos Promoters on 2019-07-26 | |

Version | |

Last Modified: 2019-07-26 | |

Revision: 8 | |

Number | |

ARB Extension #196 | |

OpenGL ES Extension #321 | |

Dependencies | |

This extension is written against the OpenGL 4.6 Specification | |

(Core Profile), dated July 30, 2017. | |

This extension requires OpenGL 4.3 or OpenGL ES 3.1. | |

This extension requires the KHR_shader_subgroup GLSL extension. | |

This extension interacts with ARB_gl_spirv and OpenGL 4.6. | |

This extension interacts with ARB_spirv_extensions and OpenGL 4.6. | |

This extension interacts with OpenGL ES 3.x. | |

This extension interacts with ARB_shader_draw_parameters and | |

SPV_KHR_shader_draw_parameters. | |

This extension interacts with SPV_KHR_storage_buffer_storage_class. | |

This extension requires SPIR-V 1.3 when SPIR-V is supported in OpenGL. | |

Overview | |

This extension enables support for the KHR_shader_subgroup shading | |

language extension in OpenGL and OpenGL ES. | |

The extension adds API queries to be able to query | |

- the size of subgroups in this implementation (SUBGROUP_SIZE_KHR) | |

- which shader stages support subgroup operations | |

(SUBGROUP_SUPPORTED_STAGES_KHR) | |

- which subgroup features are supported (SUBGROUP_SUPPORTED_FEATURES_KHR) | |

- whether quad subgroup operations are supported in all | |

stages supporting subgroup operations (SUBGROUP_QUAD_ALL_STAGES_KHR) | |

In OpenGL implementations supporting SPIR-V, this extension enables the | |

minimal subset of SPIR-V 1.3 which is required to support the subgroup | |

features that are supported by the implementation. | |

In OpenGL ES implementations, this extension does NOT add support for | |

SPIR-V or for any of the built-in shading language functions (8.18) | |

that have genDType (double) prototypes. | |

New Procedures and Functions | |

None | |

New Tokens | |

Accepted as the <pname> argument for GetIntegerv and | |

GetInteger64v: | |

SUBGROUP_SIZE_KHR 0x9532 | |

SUBGROUP_SUPPORTED_STAGES_KHR 0x9533 | |

SUBGROUP_SUPPORTED_FEATURES_KHR 0x9534 | |

Accepted as the <pname> argument for GetBooleanv: | |

SUBGROUP_QUAD_ALL_STAGES_KHR 0x9535 | |

Returned as a bitfield in the <data> argument when GetIntegerv | |

is queried with a <pname> of SUBGROUP_SUPPORTED_STAGES_KHR | |

(existing tokens) | |

VERTEX_SHADER_BIT | |

TESS_CONTROL_SHADER_BIT | |

TESS_EVALUATION_SHADER_BIT | |

GEOMETRY_SHADER_BIT | |

FRAGMENT_SHADER_BIT | |

COMPUTE_SHADER_BIT | |

Returned as bitfield in the <data> argument when GetIntegerv | |

is queried with a <pname> of SUBGROUP_SUPPORTED_FEATURES_KHR: | |

SUBGROUP_FEATURE_BASIC_BIT_KHR 0x00000001 | |

SUBGROUP_FEATURE_VOTE_BIT_KHR 0x00000002 | |

SUBGROUP_FEATURE_ARITHMETIC_BIT_KHR 0x00000004 | |

SUBGROUP_FEATURE_BALLOT_BIT_KHR 0x00000008 | |

SUBGROUP_FEATURE_SHUFFLE_BIT_KHR 0x00000010 | |

SUBGROUP_FEATURE_SHUFFLE_RELATIVE_BIT_KHR 0x00000020 | |

SUBGROUP_FEATURE_CLUSTERED_BIT_KHR 0x00000040 | |

SUBGROUP_FEATURE_QUAD_BIT_KHR 0x00000080 | |

Modifications to the OpenGL 4.6 Specification (Core Profile) | |

Add a new Chapter SG, "Subgroups" | |

A subgroup is a set of invocations that can synchronize and share data | |

with each other efficiently. An invocation group is partitioned into | |

one or more subgroups. | |

Subgroup operations are divided into various categories as described | |

by SUBGROUP_SUPPORTED_FEATURES_KHR. | |

SG.1 Subgroup Operations | |

Subgroup operations are divided into a number of categories as | |

described in this section. | |

SG.1.1 Basic Subgroup Operations | |

The basic subgroup operations allow two classes of functionality within | |

shaders - elect and barrier. Invocations within a subgroup can choose a | |

single invocation to perform some task for the subgroup as a whole using | |

elect. Invocations within a subgroup can perform a subgroup barrier to | |

ensure the ordering of execution or memory accesses within a subgroup. | |

Barriers can be performed on buffer memory accesses, shared memory | |

accesses, and image memory accesses to ensure that any results written are | |

visible by other invocations within the subgroup. A _subgroupBarrier_ can | |

also be used to perform a full execution control barrier. A full execution | |

control barrier will ensure that each active invocation within the | |

subgroup reaches a point of execution before any are allowed to continue. | |

SG.1.2 Vote Subgroup Operations | |

The vote subgroup operations allow invocations within a subgroup to | |

compare values across a subgroup. The types of votes enabled are: | |

* Do all active subgroup invocations agree that an expression is true? | |

* Do any active subgroup invocations evaluate an expression to true? | |

* Do all active subgroup invocations have the same value of an expression? | |

Note: | |

These operations are useful in combination with control flow in that | |

they allow for developers to check whether conditions match across the | |

subgroup and choose potentially faster code-paths in these cases. | |

SG.1.3 Arithmetic Subgroup Operations | |

The arithmetic subgroup operations allow invocations to perform scan | |

and reduction operations across a subgroup. For reduction operations, | |

each invocation in a subgroup will obtain the same result of these | |

arithmetic operations applied across the subgroup. For scan operations, | |

each invocation in the subgroup will perform an inclusive or exclusive | |

scan, cumulatively applying the operation across the invocations in a | |

subgroup in an implementation-defined order. The operations supported | |

are add, mul, min, max, and, or, xor. | |

SG.1.4 Ballot Subgroup Operations | |

The ballot subgroup operations allow invocations to perform more | |

complex votes across the subgroup. The ballot functionality allows | |

all invocations within a subgroup to provide a boolean value and get | |

as a result what each invocation provided as their boolean value. The | |

broadcast functionality allows values to be broadcast from an | |

invocation to all other invocations within the subgroup, given that | |

the invocation to be broadcast from is known at shader compilation | |

time. | |

SG.1.5 Shuffle Subgroup Operations | |

The shuffle subgroup operations allow invocations to read values from | |

other invocations within a subgroup. | |

SG.1.6 Shuffle Relative Subgroup Operations | |

The shuffle relative subgroup operations allow invocations to read | |

values from other invocations within the subgroup relative to the | |

current invocation in the group. The relative operations supported | |

allow data to be shifted up and down through the invocations within | |

a subgroup. | |

SG.1.7 Clustered Subgroup Operations | |

The clustered subgroup operations allow invocations to perform | |

arithmetic operations among partitions of a subgroup, such that the | |

operation is only performed within the subgroup invocations within a | |

partition. The partitions for clustered subgroup operations are | |

consecutive power-of-two size groups of invocations and the cluster size | |

must be known at compilation time. The operations supported are | |

add, mul, min, max, and, or, xor. | |

SG.1.8 Quad Subgroup Operations | |

The quad subgroup operations allow clusters of 4 invocations (a quad), | |

to share data efficiently with each other. For fragment shaders, if the | |

value of SUBGROUP_SIZE_KHR is at least 4, each quad corresponds to one | |

of the groups of four shader invocations used for derivatives. The order | |

in which the fragments appear within the quad is implementation-defined. | |

Note: | |

In OpenGL and OpenGL ES, the order of invocations within a quad may | |

depend on the rendering orientation and whether rendering to a framebuffer | |

object or to the default framebuffer (window). | |

This language supersedes the quad arrangement described in the GLSL | |

KHR_shader_subgroup document. | |

SG.2 Subgroup Queries | |

SG.2.1 Subgroup Size | |

The subgroup size is the maximum number of invocations in a subgroup. | |

This is an implementation-dependent value which can be obtained by | |

calling GetIntegerv with a <pname> of SUBGROUP_SIZE_KHR. This value | |

is also provided in the gl_SubgroupSize built-in shading language | |

variable. The subgroup size must be at least 1, and must be a power | |

of 2. The maximum number of invocations an implementation can support | |

per subgroup is 128. | |

SG.2.2 Subgroup Supported Stages | |

Subgroup operations may not be supported in all shader stages. To | |

determine which shader stages support the subgroup operations, call | |

GetIntegerv with a <pname> of SUBGROUP_SUPPORTED_STAGES_KHR. On | |

return, <data> will contain the bitwise OR of the *_SHADER_BIT flags | |

indicating which of the vertex, tessellation control, tessellation | |

evaluation, geometry, fragment, and compute shader stages support | |

subgroup operations. All implementations must support at least | |

COMPUTE_SHADER_BIT. | |

SG.2.3 Subgroup Supported Operations | |

To determine which subgroup operations are supported by an | |

implementation, call GetIntegerv with a <pname> of | |

SUBGROUP_SUPPORTED_FEATURES_KHR. On return, <data> will | |

contain the bitwise OR of the SUBGROUP_FEATURE_*_BIT_KHR | |

flags indicating which subgroup operations are supported by the | |

implementation. Possible values include: | |

* SUBGROUP_FEATURE_BASIC_BIT_KHR indicates the GL supports shaders | |

with the KHR_shader_subgroup_basic extension enabled. See SG.1.1. | |

* SUBGROUP_FEATURE_VOTE_BIT_KHR indicates the GL supports shaders | |

with the KHR_shader_subgroup_vote extension enabled. See SG.1.2. | |

* SUBGROUP_FEATURE_ARITHMETIC_BIT_KHR indicates the GL supports | |

shaders with the KHR_shader_subgroup_arithmetic extension enabled. | |

See SG.1.3. | |

* SUBGROUP_FEATURE_BALLOT_BIT_KHR indicates the GL supports | |

shaders with the KHR_shader_subgroup_ballot extension enabled. | |

See SG.1.4. | |

* SUBGROUP_FEATURE_SHUFFLE_BIT_KHR indicates the GL supports | |

shaders with the KHR_shader_subgroup_shuffle extension enabled. | |

See SG.1.5. | |

* SUBGROUP_FEATURE_SHUFFLE_RELATIVE_BIT_KHR indicates the GL | |

supports shaders with the KHR_shader_subgroup_shuffle_relative | |

extension enabled. See SG.1.6. | |

* SUBGROUP_FEATURE_CLUSTERED_BIT_KHR indicates the GL supports | |

shaders with the KHR_shader_subgroup_clustered extension enabled. | |

See SG.1.7. | |

* SUBGROUP_FEATURE_QUAD_BIT_KHR indicates the GL supports shaders | |

with the GL_KHR_shader_subgroup_quad extension enabled. See SG.1.8. | |

All implementations must support SUBGROUP_FEATURE_BASIC_BIT_KHR. | |

SG.2.4 Subgroup Quads Support | |

To determine whether subgroup quad operations (See SG.1.8) are | |

available in all stages, call GetBooleanv with a <pname> of | |

SUBGROUP_QUAD_ALL_STAGES_KHR. On return, <data> will be TRUE | |

if subgroup quad operations are supported in all shader stages | |

which support subgroup operations. FALSE is returned if subgroup quad | |

operations are not supported, or if they are restricted to fragment | |

and compute stages. | |

Modifications to Appendix C of the OpenGL 4.6 (Core Profile) Specification | |

(The OpenGL SPIR-V Execution Environment) | |

Modifications to section C.1 (Required Versions and Formats) [p661] | |

Replace the first sentence with the following: | |

"Implementations must support the 1.0 and 1.3 versions of SPIR-V | |

and the 1.0 version of the SPIR-V Extended Instructions | |

for the OpenGL Shading Language (see section 1.3.4)." | |

Modifications to section C.2 (Valid SPIR-V Built-In Variable | |

Decorations) [661] | |

Add the following rows to Table C.1 (Built-in Variable Decorations) | |

NumSubgroups (if SUBGROUP_FEATURE_BASIC_BIT_KHR is supported) | |

SubgroupId (if SUBGROUP_FEATURE_BASIC_BIT_KHR is supported) | |

SubgroupSize (if SUBGROUP_FEATURE_BASIC_BIT_KHR is supported) | |

SubgroupLocalInvocationId (if SUBGROUP_FEATURE_BASIC_BIT_KHR is supported) | |

SubgroupEqMask (if SUBGROUP_FEATURE_BALLOT_BIT_KHR is supported) | |

SubgroupGeMask (if SUBGROUP_FEATURE_BALLOT_BIT_KHR is supported) | |

SubgroupGtMask (if SUBGROUP_FEATURE_BALLOT_BIT_KHR is supported) | |

SubgroupLeMask (if SUBGROUP_FEATURE_BALLOT_BIT_KHR is supported) | |

SubgroupLtMask (if SUBGROUP_FEATURE_BALLOT_BIT_KHR is supported) | |

Additions to section C.3 (Valid SPIR-V Capabilities): | |

Add the following rows to Table C.2 (Valid SPIR-V Capabilities): | |

GroupNonUniform (if SUBGROUP_FEATURE_BASIC_BIT_KHR is supported) | |

GroupNonUniformVote (if SUBGROUP_FEATURE_VOTE_BIT_KHR is supported) | |

GroupNonUniformArithmetic (if SUBGROUP_FEATURE_ARITHMETIC_BIT_KHR is supported) | |

GroupNonUniformBallot (if SUBGROUP_FEATURE_BALLOT_BIT_KHR is supported) | |

GroupNonUniformShuffle (if SUBGROUP_FEATURE_SHUFFLE_BIT_KHR is supported) | |

GroupNonUniformShuffleRelative (if SUBGROUP_FEATURE_SHUFFLE_RELATIVE_BIT_KHR is supported) | |

GroupNonUniformClustered (if SUBGROUP_FEATURE_CLUSTERED_BIT_KHR is supported) | |

GroupNonUniformQuad (if SUBGROUP_FEATURE_QUAD_BIT_KHR is supported) | |

Additions to section C.4 (Validation Rules): | |

Make the following changes to the validation rules: | |

Add *Subgroup* to the list of acceptable scopes for memory. | |

Add: | |

*Scope* for *Non Uniform Group Operations* must be limited to: | |

- *Subgroup* | |

* If OpControlBarrier is used in fragment, vertex, tessellation | |

evaluation, or geometry stages, the execution Scope must be | |

*Subgroup*. | |

* "`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 Float64 capability is enabled, double | |

and vectors of double types are also permitted. | |

* If OpGroupNonUniformBallotBitCount is used, the group operation | |

must be one of: | |

- *Reduce* | |

- *InclusiveScan* | |

- *ExclusiveScan* | |

Add the following restrictions (disallowing SPIR-V 1.1, 1.2, and | |

1.3 features not related to subgroups); | |

* The *LocalSizeId* Execution Mode must not be used. | |

[[If SPV_KHR_storage_buffer_storage_class is not supported]] | |

* The *StorageBuffer* Storage Class must not be used. | |

* The *DependencyInfinite* and *DependencyLength* Loop Control | |

masks must not be used. | |

[[If SPV_KHR_shader_draw_parameters or OpenGL 4.6 is not supported]] | |

* The *DrawParameters* Capability must not be used. | |

* The *StorageBuffer16BitAccess*, *UniformAndStorageBuffer16BitAccess*, | |

*StoragePushConstant16*, *StorageInputOutput16* Capabilities must | |

not be used. | |

* The *DeviceGroup*, *MultiView*, *VariablePointersStorageBuffer*, and | |

*VariablePointers* Capabilities must not be used. | |

* The *OpModuleProcessed*, *OpDecorateId*, and *OpExecutionModeId* | |

Instructions must not be used. | |

Modifications to the OpenGL Shading Language Specification, Version 4.60 | |

See the separate KHR_shader_subgroup GLSL document. | |

https://github.com/KhronosGroup/GLSL/blob/master/extensions/khr/GL_KHR_shader_subgroup.txt | |

Dependencies on ARB_gl_spirv and OpenGL 4.6 | |

If ARB_gl_spirv or OpenGL 4.6 are not supported, ignore all | |

references to SPIR-V functionality. | |

Dependencies on ARB_spirv_extensions and OpenGL 4.6 | |

If ARB_spirv_extensions or OpenGL 4.6 are not supported, ignore | |

references to the ability to advertise additional SPIR-V extensions. | |

Dependencies on OpenGL ES 3.x | |

If implemented in OpenGL ES, ignore all references to SPIR-V and to | |

GLSL built-in functions which utilize the genDType (double) types. | |

Dependencies on ARB_shader_draw_parameters and SPV_KHR_shader_draw_parameters | |

If neither OpenGL 4.6, nor ARB_shader_draw_parameters and | |

SPV_KHR_shader_draw_parameters are supported, the *DrawParameters* | |

Capability is not supported. | |

Dependencies on SPV_KHR_storage_buffer_storage_class | |

If SPV_KHR_storage_buffer_storage_class is not supported, the | |

*StorageBuffer* Storage Class must not be used. | |

Additions to the AGL/GLX/WGL Specifications | |

None | |

Errors | |

None | |

New State | |

None | |

New Implementation Dependent State | |

Additions to table 2.53 - Implementation Dependent Values | |

Minimum | |

Get Value Type Get Command Value Description Sec. | |

--------- ----- --------------- ------- ------------------------ ------ | |

SUBGROUP_SIZE_KHR Z+ GetIntegerv 1 No. of invocations in SG.2.1 | |

each subgroup | |

SUBGROUP_SUPPORTED_ E GetIntegerv Sec Bitfield of stages that SG.2.2 | |

STAGES_KHR SG.2.2 subgroups are supported in | |

SUBGROUP_SUPPORTED_ E GetIntegerv Sec Bitfield of subgroup SG.2.3 | |

FEATURES_KHR SG.2.3 operations supported | |

SUBGROUP_QUAD_ B GetBooleanv - Quad subgroups supported SG.2.4 | |

ALL_STAGES_KHR in all stages | |

Issues | |

1. What should we name this extension? | |

DISCUSSION. We will use the same name as the GLSL extension | |

in order to minimize confusion. This has been done for other | |

extensions and people seem to have figured it out. Other | |

options considered: KHR_subgroups, KHR_shader_subgroup_operations, | |

KHR_subgroup_operations. | |

RESOLVED: use KHR_shader_subgroup to match the GLSL extension. | |

2. What should happen if subgroup operations are attempted on | |

unsupported stages? | |

DISCUSSION: There are basically two options | |

A. compile or link-time error? | |

B. draw time invalid_op error? | |

Seems like Option (A) would be more user friendly, and there doesn't | |

seem to be much point in requiring an implementation to | |

support compiling the functionality in stages they won't work in. | |

Typically this should be detectable by an implementation at compile | |

time since this will just require them to reject shaders with | |

#extension GL_KHR_shader_subgroup* in shader stages that they don't | |

support. However, for SPIR-V implementations, this may happen at | |

lowering time, so it may happen at either compile or link-time. | |

RESOLVED: Compile or link-time error. | |

3. How should we enable SPIR-V support for this extension? | |

DISCUSSION: Options could include: | |

A. add support for SPIR-V 1.1, 1.2, and 1.3. | |

B. add support for only the subgroups capabilities from SPIR-V 1.3. | |

Doing option (A) seems like a weird way of submarining support | |

for new versions of SPIR-V into OpenGL, and it seems like there | |

should be a separate extension for that. | |

If option (B) is selected, we need to be sure to disallow other | |

new capabilities that are added in SPIR-V 1.1, 1.2, and 1.3 | |

RESOLVED: (B) only add support for subgroup capabilities from SPIR-V | |

1.3. If a future GL core version incorporates this extension it should | |

add support for all of SPIR-V 1.3. | |

4. What functionality of SPIR-V 1.1, 1.2, and 1.3 needs to be disallowed? | |

RESOLVED: | |

Additions that aren't gated by specific capabilities and are disallowed | |

are the following: | |

LocalSizeId (1.2) | |

DependencyInfinite (1.1) | |

DependencyLength (1.1) | |

OpModuleProcessed (1.1) | |

OpDecorateId (1.2) | |

OpExecutionModeId (1.2) | |

Additions that are gated by graphics-compatible capabilities not | |

being enabled by this extension (but could be enabled by other | |

extensions): | |

Capabilities Enabling extension | |

StorageBuffer (1.3) SPV_KHR_storage_buffer_storage_class | |

DrawParameters (1.3) SPV_KHR_shader_draw_parameters | |

- BaseVertex | |

- BaseInstance | |

- DrawIndex | |

DeviceGroup (1.3) SPV_KHR_device_group | |

- DeviceIndex | |

MultiView (1.3) SPV_KHR_multiview | |

- ViewIndex | |

StorageBuffer16BitAccess (1.3) SPV_KHR_16bit_storage | |

StorageUniformBufferBlock16 (1.3) SPV_KHR_16bit_storage | |

UniformAndStorageBuffer16BitAccess (1.3) SPV_KHR_16bit_storage | |

StorageUniform16 (1.3) SPV_KHR_16bit_storage | |

StoragePushConstant16 (1.3) SPV_KHR_16bit_storage | |

StorageInputOutput16 (1.3) SPV_KHR_16bit_storage | |

VariablePointersStorageBuffer (1.3) SPV_KHR_variable_pointers | |

VariablePointers (1.3) SPV_KHR_variable_pointers | |

5. Given Issues (3) and (4) what exactly are the additional SPIR-V | |

requirements are being added by this extension? | |

RESOLVED: We add support for the following from SPIR-V 1.3: | |

Capabilities (3.31) Enabling API Feature | |

GroupNonUniform SUBGROUP_FEATURE_BASIC_BIT_KHR | |

GroupNonUniformVote SUBGROUP_FEATURE_VOTE_BIT_KHR | |

GroupNonUniformArithmetic SUBGROUP_FEATURE_ARITHMETIC_BIT_KHR | |

GroupNonUniformBallot SUBGROUP_FEATURE_BALLOT_BIT_KHR | |

GroupNonUniformShuffle SUBGROUP_FEATURE_SHUFFLE_BIT_KHR | |

GroupNonUniformShuffleRelative SUBGROUP_FEATURE_SHUFFLE_RELATIVE_BIT_KHR | |

GroupNonUniformClustered SUBGROUP_FEATURE_CLUSTERED_BIT_KHR | |

GroupNonUniformQuad SUBGROUP_FEATURE_QUAD_BIT_KHR | |

Builtins (3.21) Enabling Capability | |

SubgroupSize GroupNonUniform | |

NumSubgroups GroupNonUniform | |

SubgroupId GroupNonUniform | |

SubgroupLocalInvocationId GroupNonUniform | |

SubgroupEqMask GroupNonUniformBallot | |

SubgroupGeMask GroupNonUniformBallot | |

SubgroupGtMask GroupNonUniformBallot | |

SubgroupLeMask GroupNonUniformBallot | |

SubgroupLtMask GroupNonUniformBallot | |

Group Operations Enabling Capability | |

(3.28) | |

Reduce GroupNonUniformArithmetic, GroupNonUniformBallot | |

InclusiveScan GroupNonUniformArithmetic, GroupNonUniformBallot | |

ExclusiveScan GroupNonUniformArithmetic, GroupNonUniformBallot | |

ClusteredReduce GroupNonUniformClustered | |

Non-Uniform Instructions Enabling Capability | |

(3.32.24) | |

OpGroupNonUniformElect GroupNonUniform | |

OpGroupNonUniformAll GroupNonUniformVote | |

OpGroupNonUniformAny GroupNonUniformVote | |

OpGroupNonUniformAllEqual GroupNonUniformVote | |

OpGroupNonUniformBroadcast GroupNonUniformBallot | |

OpGroupNonUniformBroadcastFirst GroupNonUniformBallot | |

OpGroupNonUniformBallot GroupNonUniformBallot | |

OpGroupNonUniformInverseBallot GroupNonUniformBallot | |

OpGroupNonUniformBallotBitExtract GroupNonUniformBallot | |

OpGroupNonUniformBallotBitCount GroupNonUniformBallot | |

OpGroupNonUniformBallotFindLSB GroupNonUniformBallot | |

OpGroupNonUniformBallotFindMSB GroupNonUniformBallot | |

OpGroupNonUniformShuffle GroupNonUniformShuffle | |

OpGroupNonUniformShuffleXor GroupNonUniformShuffle | |

OpGroupNonUniformShuffleUp GroupNonUniformShuffle | |

OpGroupNonUniformShuffleDown GroupNonUniformShuffle | |

OpGroupNonUniformIAdd GroupNonUniformArithmetic, GroupNonUniformClustered | |

OpGroupNonUniformFAdd GroupNonUniformArithmetic, GroupNonUniformClustered | |

OpGroupNonUniformIMul GroupNonUniformArithmetic, GroupNonUniformClustered | |

OpGroupNonUniformFMul GroupNonUniformArithmetic, GroupNonUniformClustered | |

OpGroupNonUniformSMin GroupNonUniformArithmetic, GroupNonUniformClustered | |

OpGroupNonUniformUMin GroupNonUniformArithmetic, GroupNonUniformClustered | |

OpGroupNonUniformFMin GroupNonUniformArithmetic, GroupNonUniformClustered | |

OpGroupNonUniformSMax GroupNonUniformArithmetic, GroupNonUniformClustered | |

OpGroupNonUniformUMax GroupNonUniformArithmetic, GroupNonUniformClustered | |

OpGroupNonUniformFMax GroupNonUniformArithmetic, GroupNonUniformClustered | |

OpGroupNonUniformBitwiseAnd GroupNonUniformArithmetic, GroupNonUniformClustered | |

OpGroupNonUniformBitwiseOr GroupNonUniformArithmetic, GroupNonUniformClustered | |

OpGroupNonUniformBitwiseXor GroupNonUniformArithmetic, GroupNonUniformClustered | |

OpGroupNonUniformLogicalAnd GroupNonUniformArithmetic, GroupNonUniformClustered | |

OpGroupNonUniformLogicalOr GroupNonUniformArithmetic, GroupNonUniformClustered | |

OpGroupNonUniformLogicalXor GroupNonUniformArithmetic, GroupNonUniformClustered | |

OpGroupNonUniformQuadBroadcast GroupNonUniformQuad | |

OpGroupNonUniformQuadSwap GroupNonUniformQuad | |

*Subgroup* as an acceptable memory scope. | |

OpControlBarrier in fragment, vertex, tessellation evaluation, tessellation | |

control, and geometry stages with the *Subgroup* execution Scope. | |

Revision History | |

Rev. Date Author Changes | |

---- ----------- -------- ------------------------------------------- | |

8 2019-07-26 dgkoch Update status and assign extension numbers | |

7 2019-05-22 dgkoch Resync language with Vulkan spec. Address feedback | |

from Graeme. Relax quad ordering definition. | |

6 2019-03-28 dgkoch rename to KHR_shader_subgroup, update some issues | |

5 2018-05-30 dgkoch Address feedback from Graeme and Jesse. | |

4 2018-05-28 dgkoch change ALLSTAGES -> ALL_STAGES, fix typos | |

3 2018-05-23 dgkoch Add overview and interactions, add SPIR-V 1.3 | |

restrictions, Issues 4 and 5. | |

2 2018-04-26 dgkoch Various updates to match latest vulkan spec | |

Assign tokens. Add SPIR-V support. | |

1 2018-01-19 dgkoch Initial revision. | |