When looking at the mesh shader document (https://microsoft.github.io/DirectX-Specs/d3d/MeshShader.html#list-of-d3d-api-calls) it says that D3D12_INDIRECT_ARGUMENT_DESC should have a union for D3D12_DISPATCH_MESH_ARGUMENTS. However, D3D12_DISPATCH_MESH_ARGUMENTS is missing. I'm using this: https://github.com/microsoft/DirectX-Headers/tree/main
When looking at the mesh shader document (https://microsoft.github.io/DirectX-Specs/d3d/MeshShader.html#list-of-d3d-api-calls) it says that D3D12_INDIRECT_ARGUMENT_DESC should have a union for D3D12_DISPATCH_MESH_ARGUMENTS. However, D3D12_DISPATCH_MESH_ARGUMENTS is missing. I'm using this: https://github.com/microsoft/DirectX-Headers/tree/main