Modulevulkan-3.27GHC2021

Vulkan.Extensions.VK_EXT_post_depth_coverage

Name

VK_EXT_post_depth_coverage - device extension

VK_EXT_post_depth_coverage

Name String: VK_EXT_post_depth_coverage

Extension Type

Device extension

Registered Extension Number

156

Revision

Ratification Status

Ratified

Extension and Version Dependencies

None

SPIR-V Dependencies

SPV_KHR_post_depth_coverage

Contact

Daniel Koch @dgkoch%0A*Here describe the issue or question you have about the VK_EXT_post_depth_coverage extension*

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 https://registry.khronos.org/vulkan/specs/latest/html/vkspec.html#interfaces-builtin-variables-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.