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VK_AMD_negative_viewport_height

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 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.

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