1include::meta/VK_NV_viewport_array2.txt[] 2 3*Last Modified Date*:: 4 2017-02-15 5*Interactions and External Dependencies*:: 6 - This extension requires the 7 https://www.khronos.org/registry/spir-v/extensions/NV/SPV_NV_viewport_array2.html[+SPV_NV_viewport_array2+] 8 SPIR-V extension. 9 - This extension requires the 10 https://www.khronos.org/registry/OpenGL/extensions/NV/NV_viewport_array2.txt[+GL_NV_viewport_array2+] 11 extension for GLSL source languages. 12 - This extension requires the pname:geometryShader and pname:multiViewport 13 features. 14 - This extension interacts with the pname:tessellationShader feature. 15*Contributors*:: 16 - Piers Daniell, NVIDIA 17 - Jeff Bolz, NVIDIA 18 19This extension adds support for the following SPIR-V extension in Vulkan: 20 21 * +SPV_NV_viewport_array2+ 22 23which allows a single primitive to be broadcast to multiple viewports and/or 24multiple layers. 25A new shader built-in output code:ViewportMaskNV is provided, which allows a 26single primitive to be output to multiple viewports simultaneously. 27Also, a new SPIR-V decoration is added to control whether the effective 28viewport index is added into the variable decorated with the code:Layer 29built-in decoration. 30These capabilities allow a single primitive to be output to multiple layers 31simultaneously. 32 33This extension allows variables decorated with the code:Layer and 34code:ViewportIndex built-ins to be exported from vertex or tessellation 35shaders, using the code:ShaderViewportIndexLayerNV capability. 36 37This extension adds a new code:ViewportMaskNV built-in decoration that is 38available for output variables in vertex, tessellation evaluation, and 39geometry shaders, and a new code:ViewportRelativeNV decoration that can be 40added on variables decorated with code:Layer when using the 41code:ShaderViewportMaskNV capability. 42 43When using GLSL source-based shading languages, the code:gl_ViewportMask[] 44built-in output variable and code:viewport_relative layout qualifier from 45+GL_NV_viewport_array2+ map to the code:ViewportMaskNV and 46code:ViewportRelativeNV decorations, respectively. 47Behaviour is described in the +GL_NV_viewport_array2+ extension 48specificiation. 49 50ifdef::VK_EXT_shader_viewport_index_layer[] 51[NOTE] 52.Note 53==== 54The code:ShaderViewportIndexLayerNV capability is equivalent to the 55code:ShaderViewportIndexLayerEXT capability added by 56`<<VK_EXT_shader_viewport_index_layer>>`. 57==== 58endif::VK_EXT_shader_viewport_index_layer[] 59 60 61=== New Object Types 62 63None. 64 65=== New Enum Constants 66 67None. 68 69=== New Enums 70 71None. 72 73=== New Structures 74 75None. 76 77=== New Functions 78 79None. 80 81=== New or Modified Built-In Variables 82 83 * (modified) <<interfaces-builtin-variables-layer,code:Layer>> 84 * (modified) 85 <<interfaces-builtin-variables-viewportindex,code:ViewportIndex>> 86 * <<interfaces-builtin-variables-viewportmask,code:ViewportMaskNV>> 87 88=== New Variable Decoration 89 90 * <<interfaces-builtin-variables-layer,code:ViewportRelativeNV in 91 code:Layer>> 92 93=== New SPIR-V Capabilities 94 95 * <<spirvenv-capabilities-table-viewportarray2,code:ShaderViewportIndexLayerNV>> 96 * <<spirvenv-capabilities-table-viewportarray2,code:ShaderViewportMaskNV>> 97 98=== Issues 99 100None yet! 101 102=== Version History 103 104 * Revision 1, 2017-02-15 (Daniel Koch) 105 - Internal revisions 106