# VK_AMD_negative_viewport_height(3) Manual Page

## Name

VK_AMD_negative_viewport_height - device extension

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## Registered Extension Number

36

## Revision

1

## Ratification Status

Not ratified

## Extension and Version Dependencies

None

## Deprecation State

- Obsoleted by VK_KHR_maintenance1 extension

  - Which in turn was promoted to Vulkan 1.1

## Contact

- Matthaeus G. Chajdas [GitHub]anteru

## 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 VkViewport::`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 the `VK_KHR_maintenance1` extension 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 VkApplicationInfo::`apiVersion`.

## New Enum Constants

- `VK_AMD_NEGATIVE_VIEWPORT_HEIGHT_EXTENSION_NAME`

- `VK_AMD_NEGATIVE_VIEWPORT_HEIGHT_SPEC_VERSION`

## Version History

- Revision 1, 2016-09-02 (Matthaeus Chajdas)

  - Initial draft

## See Also

No cross-references are available

## Document Notes

For more information, see the Vulkan Specification

This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.

## Copyright

Copyright 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0