VK_NV_fragment_coverage_to_color

Other Extension Metadata

Last Modified Date

2017-05-21

Contributors

• Jeff Bolz, NVIDIA

Description

This extension allows the fragment coverage value, represented as an integer bitmask, to be substituted for a color output being written to a single-component color attachment with integer components (e.g. VK_FORMAT_R8_UINT). The functionality provided by this extension is different from simply writing the SampleMask fragment shader output, in that the coverage value written to the framebuffer is taken after stencil test and depth test, as well as after fragment operations such as alpha-to-coverage.

This functionality may be useful for deferred rendering algorithms, where the second pass needs to know which samples belong to which original fragments.

New Structures

• Extending VkPipelineMultisampleStateCreateInfo:
  • VkPipelineCoverageToColorStateCreateInfoNV

New Bitmasks

• VkPipelineCoverageToColorStateCreateFlagsNV

New Enum Constants

• VK_NV_FRAGMENT_COVERAGE_TO_COLOR_EXTENSION_NAME
• VK_NV_FRAGMENT_COVERAGE_TO_COLOR_SPEC_VERSION
• Extending VkStructureType:
  • VK_STRUCTURE_TYPE_PIPELINE_COVERAGE_TO_COLOR_STATE_CREATE_INFO_NV

Version History

• Revision 1, 2017-05-21 (Jeff Bolz)
  • Internal revisions