D3D12SerializeRootSignature

HRESULT D3D12SerializeRootSignature(
    const D3D12_ROOT_SIGNATURE_DESC  pRootSignature,
    D3D_ROOT_SIGNATURE_VERSION Version,
    ID3DBlob  ppBlob,
    ID3DBlob  ppErrorBlob
)

CD3DX12_ROOT_SIGNATURE_DESC rootSignatureDesc;
rootSignatureDesc.Init(0, nullptr, 0, nullptr, D3D12_ROOT_SIGNATURE_FLAG_ALLOW_INPUT_ASSEMBLER_INPUT_LAYOUT);

ComPtr<ID3DBlob> signature;
ComPtr<ID3DBlob> error;
ThrowIfFailed(D3D12SerializeRootSignature(&rootSignatureDesc, D3D_ROOT_SIGNATURE_VERSION_1, &signature, &error));
ThrowIfFailed(m_device->CreateRootSignature(0, signature->GetBufferPointer(), signature->GetBufferSize(), IID_PPV_ARGS(&m_rootSignature)));