Name

VK_EXT_shader_demote_to_helper_invocation - device extension

VK_EXT_shader_demote_to_helper_invocation

Name String

VK_EXT_shader_demote_to_helper_invocation

Extension Type

Device extension

Registered Extension Number

277

Revision

1

Ratification Status

Not ratified

Extension and Version Dependencies

VK_KHR_get_physical_device_properties2 or Vulkan Version 1.1

SPIR-V Dependencies

• SPV_EXT_demote_to_helper_invocation

Deprecation State

• Promoted to Vulkan 1.3

Contact

• Jeff Bolz @jeffbolznv%0A*Here describe the issue or question you have about the VK_EXT_shader_demote_to_helper_invocation extension*

Other Extension Metadata

Last Modified Date

2019-06-01

IP Status

No known IP claims.

Interactions and External Dependencies

• This extension provides API support for GL_EXT_demote_to_helper_invocation

Contributors

• Jeff Bolz, NVIDIA

Description

This extension adds Vulkan support for the SPV_EXT_demote_to_helper_invocation SPIR-V extension. That SPIR-V extension provides a new instruction OpDemoteToHelperInvocationEXT allowing shaders to “demote” a fragment shader invocation to behave like a helper invocation for its duration. The demoted invocation will have no further side effects and will not output to the framebuffer, but remains active and can participate in computing derivatives and in group operations. This is a better match for the “discard” instruction in HLSL.

New Structures

• Extending PhysicalDeviceFeatures2, DeviceCreateInfo:

  • PhysicalDeviceShaderDemoteToHelperInvocationFeaturesEXT

New Enum Constants

• EXT_SHADER_DEMOTE_TO_HELPER_INVOCATION_EXTENSION_NAME

• EXT_SHADER_DEMOTE_TO_HELPER_INVOCATION_SPEC_VERSION

• Extending StructureType:

  • STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_DEMOTE_TO_HELPER_INVOCATION_FEATURES_EXT

New SPIR-V Capability

• DemoteToHelperInvocationEXT

Promotion to Vulkan 1.3

Vulkan APIs in this extension are included in core Vulkan 1.3, with the EXT suffix omitted. External interactions defined by this extension, such as SPIR-V token names, retain their original names. The original Vulkan API names are still available as aliases of the core functionality.

Version History

• Revision 1, 2019-06-01 (Jeff Bolz)

  • Initial draft

See Also

No cross-references are available

Document Notes

For more information, see the Vulkan Specification.

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