| include::meta/VK_NV_sample_mask_override_coverage.txt[] |
| |
| *Last Modified Date*:: |
| 2016-12-08 |
| *IP Status*:: |
| No known IP claims. |
| *Interactions and External Dependencies*:: |
| - This extension requires the |
| https://www.khronos.org/registry/spir-v/extensions/NV/SPV_NV_sample_mask_override_coverage.html[+SPV_NV_sample_mask_override_coverage+] |
| SPIR-V extension. |
| - This extension requires the |
| https://www.khronos.org/registry/OpenGL/extensions/NV/NV_sample_mask_override_coverage.txt[+GL_NV_sample_mask_override_coverage+] |
| extension for GLSL source languages. |
| *Contributors*:: |
| - Daniel Koch, NVIDIA |
| - Jeff Bolz, NVIDIA |
| |
| 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. |
| |
| === New Object Types |
| |
| None. |
| |
| === New Enum Constants |
| |
| None. |
| |
| === New Enums |
| |
| None. |
| |
| === New Structures |
| |
| None. |
| |
| === New Functions |
| |
| None. |
| |
| === New Built-In Variables |
| |
| None. |
| |
| === New Variable Decoration |
| |
| * <<interfaces-builtin-variables-samplemask,OverrideCoverageNV in |
| SampleMask>> |
| |
| === New SPIR-V Capabilities |
| |
| * <<spirvenv-capabilities-table-samplemaskoverridecoverage,SampleMaskOverrideCoverageNV>> |
| |
| === Issues |
| |
| None. |
| |
| === Version History |
| |
| * Revision 1, 2016-12-08 (Piers Daniell) |
| - Internal revisions |
