| // Copyright (c) 2016-2020 Advanced Micro Devices, Inc. |
| // |
| // SPDX-License-Identifier: CC-BY-4.0 |
| |
| include::{generated}/meta/{refprefix}VK_AMD_negative_viewport_height.txt[] |
| |
| === Other Extension Metadata |
| |
| *Last Modified Date*:: |
| 2016-09-02 |
| *IP Status*:: |
| No known IP claims. |
| *Contributors*:: |
| - Matthaeus G. Chajdas, AMD |
| - Graham Sellers, AMD |
| - Baldur Karlsson |
| |
| === Description |
| |
| This extension allows an application to specify a negative viewport height. |
| The result is that the viewport transformation will flip along the y-axis. |
| |
| * Allow negative height to be specified in the |
| slink:VkViewport::pname:height field to perform y-inversion of the |
| clip-space to framebuffer-space transform. |
| This allows apps to avoid having to use `gl_Position.y = -gl_Position.y` |
| in shaders also targeting other APIs. |
| |
| === Obsoletion by `VK_KHR_maintenance1` and Vulkan 1.1 |
| |
| Functionality in this extension is included in `VK_KHR_maintenance1` and |
| subsequently Vulkan 1.1. |
| Due to some slight behavioral differences, this extension must: not be |
| enabled alongside `VK_KHR_maintenance1`, or in an instance created with |
| version 1.1 or later requested in slink:VkApplicationInfo::pname:apiVersion. |
| |
| include::{generated}/interfaces/VK_AMD_negative_viewport_height.txt[] |
| |
| === Version History |
| |
| * Revision 1, 2016-09-02 (Matthaeus Chajdas) |
| - Initial draft |
