106 lines
3.2 KiB
Plaintext
106 lines
3.2 KiB
Plaintext
include::meta/VK_NV_viewport_array2.txt[]
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*Last Modified Date*::
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2017-02-15
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*Interactions and External Dependencies*::
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- This extension requires the
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https://www.khronos.org/registry/spir-v/extensions/NV/SPV_NV_viewport_array2.html[`SPV_NV_viewport_array2`]
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SPIR-V extension.
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- This extension requires the
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https://www.khronos.org/registry/OpenGL/extensions/NV/NV_viewport_array2.txt[`GL_NV_viewport_array2`]
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extension for GLSL source languages.
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- This extension requires the pname:geometryShader and pname:multiViewport
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features.
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- This extension interacts with the pname:tessellationShader feature.
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*Contributors*::
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- Piers Daniell, NVIDIA
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- Jeff Bolz, NVIDIA
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This extension adds support for the following SPIR-V extension in Vulkan:
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* `SPV_NV_viewport_array2`
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which allows a single primitive to be broadcast to multiple viewports and/or
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multiple layers.
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A new shader built-in output code:ViewportMaskNV is provided, which allows a
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single primitive to be output to multiple viewports simultaneously.
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Also, a new SPIR-V decoration is added to control whether the effective
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viewport index is added into the variable decorated with the code:Layer
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built-in decoration.
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These capabilities allow a single primitive to be output to multiple layers
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simultaneously.
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This extension allows variables decorated with the code:Layer and
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code:ViewportIndex built-ins to be exported from vertex or tessellation
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shaders, using the code:ShaderViewportIndexLayerNV capability.
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This extension adds a new code:ViewportMaskNV built-in decoration that is
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available for output variables in vertex, tessellation evaluation, and
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geometry shaders, and a new code:ViewportRelativeNV decoration that can be
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added on variables decorated with code:Layer when using the
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code:ShaderViewportMaskNV capability.
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When using GLSL source-based shading languages, the code:gl_ViewportMask[]
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built-in output variable and code:viewport_relative layout qualifier from
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`GL_NV_viewport_array2` map to the code:ViewportMaskNV and
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code:ViewportRelativeNV decorations, respectively.
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Behaviour is described in the `GL_NV_viewport_array2` extension
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specificiation.
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ifdef::VK_EXT_shader_viewport_index_layer[]
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[NOTE]
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.Note
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====
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The code:ShaderViewportIndexLayerNV capability is equivalent to the
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code:ShaderViewportIndexLayerEXT capability added by
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`<<VK_EXT_shader_viewport_index_layer>>`.
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====
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endif::VK_EXT_shader_viewport_index_layer[]
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=== New Object Types
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None.
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=== New Enum Constants
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None.
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=== New Enums
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None.
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=== New Structures
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None.
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=== New Functions
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None.
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=== New or Modified Built-In Variables
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* (modified) <<interfaces-builtin-variables-layer,code:Layer>>
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* (modified)
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<<interfaces-builtin-variables-viewportindex,code:ViewportIndex>>
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* <<interfaces-builtin-variables-viewportmask,code:ViewportMaskNV>>
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=== New Variable Decoration
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* <<interfaces-builtin-variables-layer,code:ViewportRelativeNV in
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code:Layer>>
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=== New SPIR-V Capabilities
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* <<spirvenv-capabilities-table-viewportarray2,code:ShaderViewportIndexLayerNV>>
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* <<spirvenv-capabilities-table-viewportarray2,code:ShaderViewportMaskNV>>
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=== Issues
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None yet!
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=== Version History
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* Revision 1, 2017-02-15 (Daniel Koch)
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- Internal revisions
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