| include::meta/VK_EXT_shader_viewport_index_layer.txt[] |
| |
| *Last Modified Date*:: |
| 2017-08-08 |
| *Interactions and External Dependencies*:: |
| - This extension requires the |
| https://www.khronos.org/registry/spir-v/extensions/EXT/SPV_EXT_shader_viewport_index_layer.html[+SPV_EXT_shader_viewport_index_layer+] |
| SPIR-V extension. |
| - This extension requires the |
| https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_shader_viewport_layer_array.txt[+GL_ARB_shader_viewport_layer_array+], |
| https://www.khronos.org/registry/OpenGL/extensions/AMD/AMD_vertex_shader_layer.txt[+GL_AMD_vertex_shader_layer+], |
| https://www.khronos.org/registry/OpenGL/extensions/AMD/AMD_vertex_shader_viewport_index.txt[+GL_AMD_vertex_shader_viewport_index+], |
| or |
| https://www.khronos.org/registry/OpenGL/extensions/NV/NV_viewport_array2.txt[+GL_NV_viewport_array2+] |
| extensions for GLSL source languages. |
| - This extension requires the pname:multiViewport feature. |
| - This extension interacts with the pname:tessellationShader feature. |
| *Contributors*:: |
| - Piers Daniell, NVIDIA |
| - Jeff Bolz, NVIDIA |
| - Jan-Harald Fredriksen, ARM |
| - Daniel Rakos, AMD |
| - Slawomir Grajeswki, Intel |
| |
| This extension adds support for the code:ShaderViewportIndexLayerEXT |
| capability from the +SPV_EXT_shader_viewport_index_layer+ extension in |
| Vulkan. |
| |
| This extension allows variables decorated with the code:Layer and |
| code:ViewportIndex built-ins to be exported from vertex or tessellation |
| shaders, using the code:ShaderViewportIndexLayerEXT capability. |
| |
| When using GLSL source-based shading languages, the code:gl_ViewportIndex |
| and code:gl_Layer built-in variables map to the SPIR-V code:ViewportIndex |
| and code:Layer built-in decorations, respectively. |
| Behaviour of these variables is extended as described in the |
| +GL_ARB_shader_viewport_layer_array+ (or the precursor |
| +GL_AMD_vertex_shader_layer+, +GL_AMD_vertex_shader_viewport_index+, and |
| +GL_NV_viewport_array2 extensions+). |
| |
| ifdef::VK_NV_viewport_array2[] |
| [NOTE] |
| .Note |
| ==== |
| The code:ShaderViewportIndexLayerEXT capability is equivalent to the |
| code:ShaderViewportIndexLayerNV capability added by |
| `<<VK_NV_viewport_array2>>`. |
| ==== |
| endif::VK_NV_viewport_array2[] |
| |
| === New Object Types |
| |
| None. |
| |
| === New Enum Constants |
| |
| None. |
| |
| === New Enums |
| |
| None. |
| |
| === New Structures |
| |
| None. |
| |
| === New Functions |
| |
| None. |
| |
| === New or Modified Built-In Variables |
| |
| * (modified) <<interfaces-builtin-variables-layer,code:Layer>> |
| * (modified) |
| <<interfaces-builtin-variables-viewportindex,code:ViewportIndex>> |
| |
| === New Variable Decoration |
| |
| None. |
| |
| === New SPIR-V Capabilities |
| |
| * <<spirvenv-capabilities-table-shader-viewport-index-layer,code:ShaderViewportIndexLayerEXT>> |
| |
| === Issues |
| |
| None yet! |
| |
| === Version History |
| |
| * Revision 1, 2017-08-08 (Daniel Koch) |
| - Internal drafts |