Task list for VK_EXT_mesh_shader release

[pdaniell-nv]

Release Task List

Multi-vendor mesh shading for Vulkan. This extension provides a new mechanism allowing applications to generate collections of geometric primitives via programmable mesh shading. It is an alternative to the existing programmable primitive shading pipeline, which relied on generating input primitives by a fixed function assembler as well as fixed function vertex fetch.

The task list for the VK_EXT_mesh_shader release is:

• [x] Vulkan Specification: https://www.khronos.org/registry/vulkan/specs/1.3-extensions/html/vkspec.html#VK_EXT_mesh_shader
• [x] Proposal document: https://github.com/KhronosGroup/Vulkan-Docs/blob/main/proposals/VK_EXT_mesh_shader.adoc
• [x] Khronos blog post: https://www.khronos.org/blog/mesh-shading-for-vulkan
• [x] SPIRV specification: https://github.com/KhronosGroup/SPIRV-Registry/pull/165
  • [x] https://github.com/KhronosGroup/SPIRV-Registry/pull/166
• [x] SPIRV Headers: https://github.com/KhronosGroup/SPIRV-Headers/pull/288
• [x] SPIRV tools released: https://github.com/KhronosGroup/SPIRV-Tools/pull/4915
  • [x] https://github.com/KhronosGroup/SPIRV-Tools/pull/4924
• [x] GLSL extension: https://github.com/KhronosGroup/GLSL/pull/190
• [x] Glslang implementation: https://github.com/KhronosGroup/glslang/pull/3014
• [ ] Conformance tests released:
• [x] SDK released: (Extension released in SDK 1.3.231.1 without validation layer support)
• [x] Validation layer: (Validation layer support: https://github.com/KhronosGroup/Vulkan-ValidationLayers/pull/4524) Will be included in December 2022 SDK
• [ ] Vulkan Guide:
• [ ] API Examples:
• [x] Shaderc: https://github.com/google/shaderc/pull/1264
• [ ] HLSL mapping:
• [x] HLSL glslang support: no plan for the Vulkan Working Group to implement support, but external contributions would be welcome
• [x] HLSL DXC support: https://github.com/microsoft/DirectXShaderCompiler/pull/4725

As each component is made public, the task will be checked off. When all tasks have been completed this issue will be closed and the extension will be fully released.

[pdaniell-nv]

Beta drivers for NVIDIA GPUs are available here: https://developer.nvidia.com/vulkan-driver

[dgkoch]

• https://github.com/KhronosGroup/SPIRV-Headers/pull/288

[dgkoch]

• https://github.com/google/shaderc/pull/1264
• https://github.com/KhronosGroup/glslang/pull/3014
• https://github.com/KhronosGroup/SPIRV-Tools/pull/4915

[zeux]

Not an official example by any means but https://github.com/zeux/niagara was updated to EXT_mesh_shader (see https://github.com/zeux/niagara/pull/27), tested on latest radv (on RDNA2).

[BeastLe9enD]

There is a PR for HLSL support in DXC: https://github.com/microsoft/DirectXShaderCompiler/pull/4725 :)

[KlingelingelingDerEiermann]

Unfortunately there is currently no debugger x( In case anyone from Khronos is listening: If I were you, I would financially support RenderDoc to support the feature. It's being developed by one person right now, and you really can't ask them to do it on their spare time. https://github.com/baldurk/renderdoc/issues/2743

[Andreyogld3d]

What about HLSL DXC support ? I could compiled shaders from Direct3D12 Mesh Shader cull sample( MeshletAS.hlsl, MeshletMS.hlsl) and use them for Vulkan's test demo

[BeastLe9enD]

@Andreyogld3d DXC supports HLSL mesh shaders with VK_EXT_mesh_shader. See https://github.com/microsoft/DirectXShaderCompiler/pull/4725

[Andreyogld3d]

@BeastLe9enD, so in this case we can we check off task "DXC HLSL support"?

[BeastLe9enD]

@Andreyogld3d I think so! I worked with HLSL mesh shaders with the decompiler shipped with the new Vulkan SDK and I had no problems!

[Andreyogld3d]

@pdaniell-nv we can check off task "DXC HLSL support" https://github.com/microsoft/DirectXShaderCompiler/pull/4725