VK_AMD_negative_viewport_height(3)

Name

VK_AMD_negative_viewport_height - device extension

VK_AMD_negative_viewport_height

Name String

VK_AMD_negative_viewport_height

Extension Type

Device extension

Registered Extension Number

36

Revision

1

Ratification Status

Not ratified

Extension and Version Dependencies

None

Deprecation State
Contact

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.

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