HRESULT Mesh::GetVertexBuffer()

in UVAtlasTool/Mesh.cpp [1095:1196]
92 lines of code
28 McCabe index (conditional complexity)

HRESULT Mesh::GetVertexBuffer(_Inout_ DirectX::VBWriter& writer) const noexcept
{
    if (!mnVerts || !mPositions)
        return E_UNEXPECTED;

    HRESULT hr = writer.Write(mPositions.get(), "SV_Position", 0, mnVerts);
    if (FAILED(hr))
        return hr;

    if (mNormals)
    {
        auto e = writer.GetElement11("NORMAL", 0);
        if (e)
        {
            bool x2bias = (e->Format == DXGI_FORMAT_R11G11B10_FLOAT);
            hr = writer.Write(mNormals.get(), "NORMAL", 0, mnVerts, x2bias);
            if (FAILED(hr))
                return hr;
        }
    }

    if (mTangents)
    {
        auto e = writer.GetElement11("TANGENT", 0);
        if (e)
        {
            bool x2bias = (e->Format == DXGI_FORMAT_R11G11B10_FLOAT);
            hr = writer.Write(mTangents.get(), "TANGENT", 0, mnVerts, x2bias);
            if (FAILED(hr))
                return hr;
        }
    }

    if (mBiTangents)
    {
        auto e = writer.GetElement11("BINORMAL", 0);
        if (e)
        {
            bool x2bias = (e->Format == DXGI_FORMAT_R11G11B10_FLOAT);
            hr = writer.Write(mBiTangents.get(), "BINORMAL", 0, mnVerts, x2bias);
            if (FAILED(hr))
                return hr;
        }
    }

    if (mTexCoords)
    {
        auto e = writer.GetElement11("TEXCOORD", 0);
        if (e)
        {
            hr = writer.Write(mTexCoords.get(), "TEXCOORD", 0, mnVerts);
            if (FAILED(hr))
                return hr;
        }
    }

    if (mTexCoords2)
    {
        auto e = writer.GetElement11("TEXCOORD", 1);
        if (e)
        {
            hr = writer.Write(mTexCoords2.get(), "TEXCOORD", 1, mnVerts);
            if (FAILED(hr))
                return hr;
        }
    }

    if (mColors)
    {
        auto e = writer.GetElement11("COLOR", 0);
        if (e)
        {
            hr = writer.Write(mColors.get(), "COLOR", 0, mnVerts);
            if (FAILED(hr))
                return hr;
        }
    }

    if (mBlendIndices)
    {
        auto e = writer.GetElement11("BLENDINDICES", 0);
        if (e)
        {
            hr = writer.Write(mBlendIndices.get(), "BLENDINDICES", 0, mnVerts);
            if (FAILED(hr))
                return hr;
        }
    }

    if (mBlendWeights)
    {
        auto e = writer.GetElement11("BLENDWEIGHT", 0);
        if (e)
        {
            hr = writer.Write(mBlendWeights.get(), "BLENDWEIGHT", 0, mnVerts);
            if (FAILED(hr))
                return hr;
        }
    }

    return S_OK;
}