Fail to create root signature with version 3.3.4

[BarisUckardes]

//Create root signature
RootParameter vertexRootParameter = new RootParameter(
    new RootDescriptorTable()
    {
        Ranges = new DescriptorRange[]
        {
            new DescriptorRange(DescriptorRangeType.ConstantBufferView,1,0,0),
        }
    },
     ShaderVisibility.Vertex);

RootParameter pixelSRVRootParameter = new RootParameter(
   new RootDescriptorTable()
   {
       Ranges = new DescriptorRange[]
       {
            new DescriptorRange(DescriptorRangeType.ShaderResourceView,1,0,0),
       }
   },
    ShaderVisibility.Pixel);

RootParameter pixelSamplerRootParameter = new RootParameter(
    new RootDescriptorTable()
    {
        Ranges = new DescriptorRange[]
        {
            new DescriptorRange(DescriptorRangeType.Sampler,1,0)
        },
    },
    ShaderVisibility.Pixel);

RootParameter[] rootParameters = new[] { vertexRootParameter, pixelSRVRootParameter,pixelSamplerRootParameter };

RootSignatureFlags rootSignatureFlags = RootSignatureFlags.AllowInputAssemblerInputLayout;
rootSignatureFlags |= RootSignatureFlags.DenyHullShaderRootAccess;
rootSignatureFlags |= RootSignatureFlags.DenyDomainShaderRootAccess;
rootSignatureFlags |= RootSignatureFlags.DenyGeometryShaderRootAccess;
rootSignatureFlags |= RootSignatureFlags.DenyAmplificationShaderRootAccess;
rootSignatureFlags |= RootSignatureFlags.DenyMeshShaderRootAccess;

VersionedRootSignatureDescription signatureDesc = new VersionedRootSignatureDescription(new RootSignatureDescription(rootSignatureFlags,null,null));
D3D12.D3D12SerializeVersionedRootSignature(signatureDesc,out Vortice.Direct3D.Blob signatureBlob);

Result rootSignatureResult = Renderer.Device.CreateRootSignature<ID3D12RootSignature>(0,signatureBlob.BufferPointer,signatureBlob.BufferSize,out _rootSignature);
if (rootSignatureResult.Failure)
    throw new Exception(rootSignatureResult.Description);

Here's the C# code which the root signature method returns null without any error.

I have also replicated the same behaviour in the C++ and it returns a valid object without error.

Does Vortice has different workflow for creating root signatures or my code is the root of the evil here.

Note: I have also tried creating an empty root signature it fails on Vortice while exact C++ replica does not.

[amerkoleci]

Not sure what the issues are, did you tried to use 3.4.3-beta package? There are bunch of samples working without issues:

https://github.com/amerkoleci/Vortice.Windows.Samples/tree/main/src/Direct3D12

Otherwise enable native debug and see what Visual Studio Output Window outputs.

[amerkoleci]

Can you confirm if it works with latest beta version?

[BarisUckardes]

We did not get it working. However if I create a new project for testing and serialize an root signature there then it works.

So it points it's some internal logic and flags preventing us from successfully serializing an empty root signature in our main project.