Safe Haskell | Safe-Inferred |
---|---|
Language | Haskell2010 |
Name
VK_EXT_subgroup_size_control - device extension
VK_EXT_subgroup_size_control
- Name String
VK_EXT_subgroup_size_control
- Extension Type
- Device extension
- Registered Extension Number
- 226
- Revision
- 2
- Ratification Status
- Not ratified
- Extension and Version Dependencies
- Version 1.1
- Deprecation State
- Promoted to Vulkan 1.3
- Contact
Other Extension Metadata
- Last Modified Date
- 2019-03-05
- Interactions and External Dependencies
- Promoted to Vulkan 1.3 Core
- Contributors
- Jeff Bolz, NVIDIA
- Faith Ekstrand, Intel
- Sławek Grajewski, Intel
- Jesse Hall, Google
- Neil Henning, AMD
- Daniel Koch, NVIDIA
- Jeff Leger, Qualcomm
- Graeme Leese, Broadcom
- Allan MacKinnon, Google
- Mariusz Merecki, Intel
- Graham Wihlidal, Electronic Arts
Description
This extension enables an implementation to control the subgroup size by allowing a varying subgroup size and also specifying a required subgroup size.
It extends the subgroup support in Vulkan 1.1 to allow an implementation to expose a varying subgroup size. Previously Vulkan exposed a single subgroup size per physical device, with the expectation that implementations will behave as if all subgroups have the same size. Some implementations may dispatch shaders with a varying subgroup size for different subgroups. As a result they could implicitly split a large subgroup into smaller subgroups or represent a small subgroup as a larger subgroup, some of whose invocations were inactive on launch.
To aid developers in understanding the performance characteristics of
their programs, this extension exposes a minimum and maximum subgroup
size that a physical device supports and a pipeline create flag to
enable that pipeline to vary its subgroup size. If enabled, any
SubgroupSize
decorated variables in the SPIR-V shader modules provided
to pipeline creation may vary between the
minimum
and
maximum
subgroup sizes.
An implementation is also optionally allowed to support specifying a
required subgroup size for a given pipeline stage. Implementations
advertise which
stages support a required subgroup size,
and any pipeline of a supported stage can be passed a
PipelineShaderStageRequiredSubgroupSizeCreateInfoEXT
structure to set
the subgroup size for that shader stage of the pipeline. For compute
shaders, this requires the developer to query the
maxComputeWorkgroupSubgroups
and ensure that:
\[s = { WorkGroupSize.x \times WorkGroupSize.y \times WorkgroupSize.z \leq SubgroupSize \times maxComputeWorkgroupSubgroups }\]
Developers can also specify a new pipeline shader stage create flag that requires the implementation to have fully populated subgroups within local workgroups. This requires the workgroup size in the X dimension to be a multiple of the subgroup size.
New Structures
Extending
PhysicalDeviceProperties2
:Extending
PipelineShaderStageCreateInfo
,ShaderCreateInfoEXT
:
New Enum Constants
EXT_SUBGROUP_SIZE_CONTROL_SPEC_VERSION
Extending
PipelineShaderStageCreateFlagBits
:Extending
StructureType
:
Promotion to Vulkan 1.3
Functionality in this extension is included in core Vulkan 1.3, with the EXT suffix omitted. The original type, enum and command names are still available as aliases of the core functionality.
Version History
Revision 1, 2019-03-05 (Neil Henning)
- Initial draft
Revision 2, 2019-07-26 (Faith Ekstrand)
- Add the missing
PhysicalDeviceSubgroupSizeControlFeaturesEXT
for querying subgroup size control features.
- Add the missing
See Also
PhysicalDeviceSubgroupSizeControlFeaturesEXT
,
PhysicalDeviceSubgroupSizeControlPropertiesEXT
,
PipelineShaderStageRequiredSubgroupSizeCreateInfoEXT
Document Notes
For more information, see the Vulkan Specification
This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.
Documentation
pattern STRUCTURE_TYPE_PHYSICAL_DEVICE_SUBGROUP_SIZE_CONTROL_PROPERTIES_EXT :: StructureType Source #
pattern STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_REQUIRED_SUBGROUP_SIZE_CREATE_INFO_EXT :: StructureType Source #
pattern PIPELINE_SHADER_STAGE_CREATE_ALLOW_VARYING_SUBGROUP_SIZE_BIT_EXT :: PipelineShaderStageCreateFlagBits Source #
pattern PIPELINE_SHADER_STAGE_CREATE_REQUIRE_FULL_SUBGROUPS_BIT_EXT :: PipelineShaderStageCreateFlagBits Source #
type PhysicalDeviceSubgroupSizeControlFeaturesEXT = PhysicalDeviceSubgroupSizeControlFeatures Source #
type PhysicalDeviceSubgroupSizeControlPropertiesEXT = PhysicalDeviceSubgroupSizeControlProperties Source #
type PipelineShaderStageRequiredSubgroupSizeCreateInfoEXT = PipelineShaderStageRequiredSubgroupSizeCreateInfo Source #
pattern EXT_SUBGROUP_SIZE_CONTROL_SPEC_VERSION :: forall a. Integral a => a Source #
type EXT_SUBGROUP_SIZE_CONTROL_EXTENSION_NAME = "VK_EXT_subgroup_size_control" Source #
pattern EXT_SUBGROUP_SIZE_CONTROL_EXTENSION_NAME :: forall a. (Eq a, IsString a) => a Source #