This extension adds support for the following SPIR-V extension in Vulkan:

• SPV_NV_viewport_array2

which allows a single primitive to be broadcast to multiple viewports and/or multiple layers. A new shader built-in output ViewportMaskNV is provided, which allows a single primitive to be output to multiple viewports simultaneously. Also, a new SPIR-V decoration is added to control whether the effective viewport index is added into the variable decorated with the Layer built-in decoration. These capabilities allow a single primitive to be output to multiple layers simultaneously.

This extension allows variables decorated with the Layer and ViewportIndex built-ins to be exported from vertex or tessellation shaders, using the ShaderViewportIndexLayerNV capability.

This extension adds a new ViewportMaskNV built-in decoration that is available for output variables in vertex, tessellation evaluation, and geometry shaders, and a new ViewportRelativeNV decoration that can be added on variables decorated with Layer when using the ShaderViewportMaskNV capability.

When using GLSL source-based shading languages, the gl_ViewportMask[] built-in output variable and viewport_relative layout qualifier from GL_NV_viewport_array2 map to the ViewportMaskNV and ViewportRelativeNV decorations, respectively. Behaviour is described in the GL_NV_viewport_array2 extension specification.

VK_NV_viewport_array2

Name String

VK_NV_viewport_array2

Extension Type

Device extension

Registered Extension Number

97

Revision

1

Contact

• Daniel Koch dgkoch

Other Extension Metadata

Last Modified Date

2017-02-15

Interactions and External Dependencies

• This extension requires SPV_NV_viewport_array2
• This extension provides API support for GL_NV_viewport_array2
• This extension requires the geometryShader and multiViewport features.
• This extension interacts with the tessellationShader feature.

Contributors

• Piers Daniell, NVIDIA
• Jeff Bolz, NVIDIA