inline HRESULT D3DX12SerializeVersionedRootSignature()

in Tools/WinMLRunner/src/d3dx12.h [2032:2145]
100 lines of code
26 McCabe index (conditional complexity)

inline HRESULT D3DX12SerializeVersionedRootSignature(
    _In_ const D3D12_VERSIONED_ROOT_SIGNATURE_DESC* pRootSignatureDesc,
    D3D_ROOT_SIGNATURE_VERSION MaxVersion,
    _Outptr_ ID3DBlob** ppBlob,
    _Always_(_Outptr_opt_result_maybenull_) ID3DBlob** ppErrorBlob)
{
    if (ppErrorBlob != nullptr)
    {
        *ppErrorBlob = nullptr;
    }

    switch (MaxVersion)
    {
        case D3D_ROOT_SIGNATURE_VERSION_1_0:
            switch (pRootSignatureDesc->Version)
            {
                case D3D_ROOT_SIGNATURE_VERSION_1_0:
                    return D3D12SerializeRootSignature(&pRootSignatureDesc->Desc_1_0, D3D_ROOT_SIGNATURE_VERSION_1, ppBlob, ppErrorBlob);

                case D3D_ROOT_SIGNATURE_VERSION_1_1:
                {
                    HRESULT hr = S_OK;
                    const D3D12_ROOT_SIGNATURE_DESC1& desc_1_1 = pRootSignatureDesc->Desc_1_1;

                    const SIZE_T ParametersSize = sizeof(D3D12_ROOT_PARAMETER) * desc_1_1.NumParameters;
                    void* pParameters = (ParametersSize > 0) ? HeapAlloc(GetProcessHeap(), 0, ParametersSize) : nullptr;
                    if (ParametersSize > 0 && pParameters == nullptr)
                    {
                        hr = E_OUTOFMEMORY;
                    }
                    auto pParameters_1_0 = reinterpret_cast<D3D12_ROOT_PARAMETER*>(pParameters);

                    if (SUCCEEDED(hr))
                    {
                        for (UINT n = 0; n < desc_1_1.NumParameters; n++)
                        {
                            __analysis_assume(ParametersSize == sizeof(D3D12_ROOT_PARAMETER) * desc_1_1.NumParameters);
                            pParameters_1_0[n].ParameterType = desc_1_1.pParameters[n].ParameterType;
                            pParameters_1_0[n].ShaderVisibility = desc_1_1.pParameters[n].ShaderVisibility;

                            switch (desc_1_1.pParameters[n].ParameterType)
                            {
                            case D3D12_ROOT_PARAMETER_TYPE_32BIT_CONSTANTS:
                                pParameters_1_0[n].Constants.Num32BitValues = desc_1_1.pParameters[n].Constants.Num32BitValues;
                                pParameters_1_0[n].Constants.RegisterSpace = desc_1_1.pParameters[n].Constants.RegisterSpace;
                                pParameters_1_0[n].Constants.ShaderRegister = desc_1_1.pParameters[n].Constants.ShaderRegister;
                                break;

                            case D3D12_ROOT_PARAMETER_TYPE_CBV:
                            case D3D12_ROOT_PARAMETER_TYPE_SRV:
                            case D3D12_ROOT_PARAMETER_TYPE_UAV:
                                pParameters_1_0[n].Descriptor.RegisterSpace = desc_1_1.pParameters[n].Descriptor.RegisterSpace;
                                pParameters_1_0[n].Descriptor.ShaderRegister = desc_1_1.pParameters[n].Descriptor.ShaderRegister;
                                break;

                            case D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE:
                                const D3D12_ROOT_DESCRIPTOR_TABLE1& table_1_1 = desc_1_1.pParameters[n].DescriptorTable;

                                const SIZE_T DescriptorRangesSize = sizeof(D3D12_DESCRIPTOR_RANGE) * table_1_1.NumDescriptorRanges;
                                void* pDescriptorRanges = (DescriptorRangesSize > 0 && SUCCEEDED(hr)) ? HeapAlloc(GetProcessHeap(), 0, DescriptorRangesSize) : nullptr;
                                if (DescriptorRangesSize > 0 && pDescriptorRanges == nullptr)
                                {
                                    hr = E_OUTOFMEMORY;
                                }
                                auto pDescriptorRanges_1_0 = reinterpret_cast<D3D12_DESCRIPTOR_RANGE*>(pDescriptorRanges);

                                if (SUCCEEDED(hr))
                                {
                                    for (UINT x = 0; x < table_1_1.NumDescriptorRanges; x++)
                                    {
                                        __analysis_assume(DescriptorRangesSize == sizeof(D3D12_DESCRIPTOR_RANGE) * table_1_1.NumDescriptorRanges);
                                        pDescriptorRanges_1_0[x].BaseShaderRegister = table_1_1.pDescriptorRanges[x].BaseShaderRegister;
                                        pDescriptorRanges_1_0[x].NumDescriptors = table_1_1.pDescriptorRanges[x].NumDescriptors;
                                        pDescriptorRanges_1_0[x].OffsetInDescriptorsFromTableStart = table_1_1.pDescriptorRanges[x].OffsetInDescriptorsFromTableStart;
                                        pDescriptorRanges_1_0[x].RangeType = table_1_1.pDescriptorRanges[x].RangeType;
                                        pDescriptorRanges_1_0[x].RegisterSpace = table_1_1.pDescriptorRanges[x].RegisterSpace;
                                    }
                                }

                                D3D12_ROOT_DESCRIPTOR_TABLE& table_1_0 = pParameters_1_0[n].DescriptorTable;
                                table_1_0.NumDescriptorRanges = table_1_1.NumDescriptorRanges;
                                table_1_0.pDescriptorRanges = pDescriptorRanges_1_0;
                            }
                        }
                    }

                    if (SUCCEEDED(hr))
                    {
                        CD3DX12_ROOT_SIGNATURE_DESC desc_1_0(desc_1_1.NumParameters, pParameters_1_0, desc_1_1.NumStaticSamplers, desc_1_1.pStaticSamplers, desc_1_1.Flags);
                        hr = D3D12SerializeRootSignature(&desc_1_0, D3D_ROOT_SIGNATURE_VERSION_1, ppBlob, ppErrorBlob);
                    }

                    if (pParameters)
                    {
                        for (UINT n = 0; n < desc_1_1.NumParameters; n++)
                        {
                            if (desc_1_1.pParameters[n].ParameterType == D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE)
                            {
                                HeapFree(GetProcessHeap(), 0, reinterpret_cast<void*>(const_cast<D3D12_DESCRIPTOR_RANGE*>(pParameters_1_0[n].DescriptorTable.pDescriptorRanges)));
                            }
                        }
                        HeapFree(GetProcessHeap(), 0, pParameters);
                    }
                    return hr;
                }
            }
            break;

        case D3D_ROOT_SIGNATURE_VERSION_1_1:
            return D3D12SerializeVersionedRootSignature(pRootSignatureDesc, ppBlob, ppErrorBlob);
    }

    return E_INVALIDARG;
}