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 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 VkApplicationInfo::apiVersion.

VK_AMD_negative_viewport_height

Name String

VK_AMD_negative_viewport_height

Extension Type

Device extension

Registered Extension Number

36

Revision

1

Deprecation state

• Obsoleted by VK_KHR_maintenance1 extension
  • Which in turn was promoted to Vulkan 1.1

Contact

• Matthaeus G. Chajdas 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