| // Copyright 2018-2021 The Khronos Group Inc. |
| // |
| // SPDX-License-Identifier: CC-BY-4.0 |
| |
| include::{generated}/meta/{refprefix}VK_EXT_fragment_density_map.txt[] |
| |
| === Other Extension Metadata |
| |
| *Last Modified Date*:: |
| 2021-09-30 |
| *Interactions and External Dependencies*:: |
| - This extension requires |
| {spirv}/EXT/SPV_EXT_fragment_invocation_density.html[`SPV_EXT_fragment_invocation_density`] |
| *Contributors*:: |
| - Matthew Netsch, Qualcomm Technologies, Inc. |
| - Robert VanReenen, Qualcomm Technologies, Inc. |
| - Jonathan Wicks, Qualcomm Technologies, Inc. |
| - Tate Hornbeck, Qualcomm Technologies, Inc. |
| - Sam Holmes, Qualcomm Technologies, Inc. |
| - Jeff Leger, Qualcomm Technologies, Inc. |
| - Jan-Harald Fredriksen, ARM |
| - Jeff Bolz, NVIDIA |
| - Pat Brown, NVIDIA |
| - Daniel Rakos, AMD |
| - Piers Daniell, NVIDIA |
| |
| === Description |
| |
| This extension allows an application to specify areas of the render target |
| where the fragment shader may be invoked fewer times. |
| These fragments are broadcasted out to multiple pixels to cover the render |
| target. |
| |
| The primary use of this extension is to reduce workloads in areas where |
| lower quality may not be perceived such as the distorted edges of a lens or |
| the periphery of a user's gaze. |
| |
| include::{generated}/interfaces/VK_EXT_fragment_density_map.txt[] |
| |
| === New or Modified Built-In Variables |
| |
| * <<interfaces-builtin-variables-fraginvocationcount,code:FragInvocationCountEXT>> |
| * <<interfaces-builtin-variables-fragsize,code:FragSizeEXT>> |
| |
| === New SPIR-V Capabilities |
| |
| * <<spirvenv-capabilities-table-FragmentDensityEXT,FragmentDensityEXT>> |
| |
| === Version History |
| |
| * Revision 1, 2018-09-25 (Matthew Netsch) |
| - Initial version |
| * Revision 2, 2021-09-30 (Jon Leech) |
| - Add interaction with `apiext:VK_KHR_format_feature_flags2` to `vk.xml` |
