| // Copyright 2017-2021 The Khronos Group Inc. |
| // |
| // SPDX-License-Identifier: CC-BY-4.0 |
| |
| include::{generated}/meta/{refprefix}VK_EXT_post_depth_coverage.txt[] |
| |
| === Other Extension Metadata |
| |
| *Last Modified Date*:: |
| 2017-07-17 |
| *Interactions and External Dependencies*:: |
| - This extension requires |
| {spirv}/KHR/SPV_KHR_post_depth_coverage.html[`SPV_KHR_post_depth_coverage`] |
| - This extension provides API support for |
| https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_post_depth_coverage.txt[`GL_ARB_post_depth_coverage`] |
| and |
| https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_post_depth_coverage.txt[`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 |
| code:SampleMask built-in input variable reflect the coverage after early |
| <<fragops-depth,depth>> and <<fragops-stencil,stencil>> tests are applied. |
| |
| This extension adds a new code:PostDepthCoverage execution mode under the |
| code:SampleMaskPostDepthCoverage capability. |
| When this mode is specified along with code:EarlyFragmentTests, the value of |
| an input variable decorated with the |
| <<interfaces-builtin-variables-samplemask, code:SampleMask>> built-in |
| reflects the coverage after the <<shaders-fragment-earlytest, early fragment |
| tests>> are applied. |
| Otherwise, it reflects the coverage before the depth and stencil tests. |
| |
| When using GLSL source-based shading languages, the code:post_depth_coverage |
| layout qualifier from GL_ARB_post_depth_coverage or |
| GL_EXT_post_depth_coverage maps to the code:PostDepthCoverage execution |
| mode. |
| |
| include::{generated}/interfaces/VK_EXT_post_depth_coverage.txt[] |
| |
| === New SPIR-V Capabilities |
| |
| * <<spirvenv-capabilities-table-SampleMaskPostDepthCoverage,SampleMaskPostDepthCoverage>> |
| |
| === Version History |
| |
| * Revision 1, 2017-07-17 (Daniel Koch) |
| - Internal revisions |
