It seems that one of the overloads of the ID3D12Device1.CreateRootSignature(...) method throws an exception

[Aycon3296]

Summary

One of the signatures throws an exception
InternalException: "ArgumentException: Value does not fall within the expected range."
while the other does not:

unsafe
{
  // This is work
  _hResult = s_device1.CreateRootSignature(nodeMask: 0, _signature.GetBufferPointer(), _signature.GetBufferSize(), out s_rootSignature);
  SilkMarshal.ThrowHResult(_hResult);
}

unsafe
{
  // This is NOT work
  _hResult = s_device1.CreateRootSignature(nodeMask: 0, in _signature, _signature.GetBufferSize(), out s_rootSignature);
  SilkMarshal.ThrowHResult(_hResult);
}

It seems the function is being called with different parameters pBlobWithRootSignature:

Steps to reproduce

• Platform: Desktop
• Framework Version: .NET Core 8.0
• API: DirectX 3D
• API Version: Direct3D 12

Call the "ID3D12Device1.CreateRootSignature" overload (line 5841 in Silk.NET.Direct3D12.ID3D12Device1VtblExtentions.cs):
public unsafe static int CreateRootSignature<T0, TI0>(this ComPtr<ID3D12Device1> thisVtbl, uint nodeMask, [Flow(FlowDirection.In)][RequiresLocation] in T0 pBlobWithRootSignature, nuint blobLengthInBytes, out ComPtr<TI0> ppvRootSignature) where T0 : unmanaged where TI0 : unmanaged, IComVtbl<TI0>

Full example of usage:

private static void CreateRootSignature()
{
  HResult _hResult;
  RootSignatureDesc _signatureDesc = new()
  {
    NumParameters = 0,
    PParameters = null,
    NumStaticSamplers = 0,
    PStaticSamplers = null,
    Flags = RootSignatureFlags.AllowInputAssemblerInputLayout
  };

  ComPtr<ID3D10Blob> _signature = new();
  ComPtr<ID3D10Blob> _error = new();

  _hResult = s_d3d12.SerializeRootSignature(ref _signatureDesc, D3DRootSignatureVersion.Version1, ref _signature, ref _error);
  SilkMarshal.ThrowHResult(_hResult);

  // Error handling...

  _hResult = s_device1.CreateRootSignature(nodeMask: 0, in _signature, _signature.GetBufferSize(), out s_rootSignature);
  SilkMarshal.ThrowHResult(_hResult);
}

Comments

The third line here looks quite suspicious (call nested):

fixed (T0* ptr2 = &pBlobWithRootSignature)
{
    void* ptr3 = ptr2;
    result = ((delegate* unmanaged[Stdcall]<ID3D12Device1*, uint, void*, UIntPtr, Guid*, void**, int>)ptr->LpVtbl[16])(ptr, nodeMask, ptr3, blobLengthInBytes, riid, ppvRootSignature);
}

[Perksey]

This is expected, in _signature and _signature.GetBufferPointer() are not equal.