| // Copyright (c) 2016-2020 NVIDIA Corporation |
| // |
| // SPDX-License-Identifier: CC-BY-4.0 |
| |
| include::{generated}/meta/{refprefix}VK_NV_sample_mask_override_coverage.txt[] |
| |
| === Other Extension Metadata |
| |
| *Last Modified Date*:: |
| 2016-12-08 |
| *IP Status*:: |
| No known IP claims. |
| *Interactions and External Dependencies*:: |
| - This extension requires |
| {spirv}/NV/SPV_NV_sample_mask_override_coverage.html[`SPV_NV_sample_mask_override_coverage`] |
| - This extension provides API support for |
| https://www.khronos.org/registry/OpenGL/extensions/NV/NV_sample_mask_override_coverage.txt[`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 code:OverrideCoverageNV decoration |
| under the code:SampleMaskOverrideCoverageNV capability. |
| Adding this decoration to a variable with the code: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 code:override_coverage |
| layout qualifier from `GL_NV_sample_mask_override_coverage` maps to the |
| code:OverrideCoverageNV decoration. |
| To use the code: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. |
| |
| include::{generated}/interfaces/VK_NV_sample_mask_override_coverage.txt[] |
| |
| === New Variable Decoration |
| |
| * <<interfaces-builtin-variables-samplemask,OverrideCoverageNV in |
| SampleMask>> |
| |
| === New SPIR-V Capabilities |
| |
| * <<spirvenv-capabilities-table-SampleMaskOverrideCoverageNV,SampleMaskOverrideCoverageNV>> |
| |
| === Version History |
| |
| * Revision 1, 2016-12-08 (Piers Daniell) |
| - Internal revisions |
