VK_EXT_shader_demote_to_helper_invocation(3)

# VK_EXT_shader_demote_to_helper_invocation(3) Manual Page

## Name

VK_EXT_shader_demote_to_helper_invocation - device extension

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## Registered Extension Number

277

## Revision

1

## Extension and Version Dependencies

- Requires Vulkan 1.0

- Requires `VK_KHR_get_physical_device_properties2`

### Other Extension Metadata

Last Modified Date

  2019-06-01

IP Status

  No known IP claims.

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 VkPhysicalDeviceFeatures2, VkDeviceCreateInfo:

  - VkPhysicalDeviceShaderDemoteToHelperInvocationFeaturesEXT

### New Enum Constants

- `VK_EXT_SHADER_DEMOTE_TO_HELPER_INVOCATION_EXTENSION_NAME`

- `VK_EXT_SHADER_DEMOTE_TO_HELPER_INVOCATION_SPEC_VERSION`

- Extending VkStructureType:

  - `VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_DEMOTE_TO_HELPER_INVOCATION_FEATURES_EXT`

### New SPIR-V Capability

- DemoteToHelperInvocationEXT

### Version History

- Revision 1, 2019-06-01 (Jeff Bolz)

  - Initial draft

## See Also

VkPhysicalDeviceShaderDemoteToHelperInvocationFeaturesEXT

## 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.

## Copyright

Copyright (c) 2014-2020 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.