# VK_NV_sample_mask_override_coverage(3) Manual Page

## Name

VK_NV_sample_mask_override_coverage - device extension

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## Registered Extension Number

95

## Revision

1

## Ratification Status

Not ratified

## Extension and Version Dependencies

None

## SPIR-V Dependencies

- SPV_NV_sample_mask_override_coverage

## Contact

- Piers Daniell [GitHub]pdaniell-nv

## Other Extension Metadata

Last Modified Date

  2016-12-08

IP Status

  No known IP claims.

Interactions and External Dependencies

  - This extension provides API support for `GL_NV_sample_mask_override_coverage`

Contributors

  - Daniel Koch, NVIDIA

  - Jeff Bolz, NVIDIA

## Description

This extension adds support for the following SPIR-V extension in Vulkan:

- `SPV_NV_sample_mask_override_coverage`

The extension provides access to the `OverrideCoverageNV` decoration under the `SampleMaskOverrideCoverageNV` capability. Adding this decoration to a variable with the `SampleMask` builtin decoration allows the shader to modify the coverage mask and affect which samples are used to process the fragment.

When using GLSL source-based shader languages, the `override_coverage` layout qualifier from `GL_NV_sample_mask_override_coverage` maps to the `OverrideCoverageNV` decoration. To use the `override_coverage` layout qualifier in GLSL the `GL_NV_sample_mask_override_coverage` extension must be enabled. Behavior is described in the `GL_NV_sample_mask_override_coverage` extension spec.

## New Enum Constants

- `VK_NV_SAMPLE_MASK_OVERRIDE_COVERAGE_EXTENSION_NAME`

- `VK_NV_SAMPLE_MASK_OVERRIDE_COVERAGE_SPEC_VERSION`

## New Variable Decoration

- OverrideCoverageNV in SampleMask

## New SPIR-V Capabilities

- `SampleMaskOverrideCoverageNV`

## Version History

- Revision 1, 2016-12-08 (Piers Daniell)

  - Internal revisions

## See Also

No cross-references are available

## 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 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0