VK_EXT_post_depth_coverage

Other Extension Metadata

Last Modified Date

2017-07-17

Interactions and External Dependencies

• This extension provides API support for GL_ARB_post_depth_coverage and GL_EXT_post_depth_coverage

Contributors

• Jeff Bolz, NVIDIA

Description

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

• SPV_KHR_post_depth_coverage

which allows the fragment shader to control whether values in the SampleMask built-in input variable reflect the coverage after early depth and stencil tests are applied.

This extension adds a new PostDepthCoverage execution mode under the SampleMaskPostDepthCoverage capability. When this mode is specified along with EarlyFragmentTests, the value of an input variable decorated with the SampleMask built-in reflects the coverage after the early fragment tests are applied. Otherwise, it reflects the coverage before the depth and stencil tests.

When using GLSL source-based shading languages, the post_depth_coverage layout qualifier from GL_ARB_post_depth_coverage or GL_EXT_post_depth_coverage maps to the PostDepthCoverage execution mode.

New Enum Constants

• VK_EXT_POST_DEPTH_COVERAGE_EXTENSION_NAME
• VK_EXT_POST_DEPTH_COVERAGE_SPEC_VERSION

New SPIR-V Capabilities

• SampleMaskPostDepthCoverage

Version History

• Revision 1, 2017-07-17 (Daniel Koch)
  • Internal revisions