Method UpdateVertexAndVaryingPrimvars

Hydrogent/src/HnMesh.cpp:502–546

}

void HnMesh::UpdateVertexAndVaryingPrimvars(pxr::HdSceneDelegate& SceneDelegate,
                                            pxr::HdRenderParam*   RenderParam,
                                            pxr::HdDirtyBits&     DirtyBits,
                                            const pxr::TfToken&   ReprToken)
{
    VERIFY_EXPR(m_StagingVertexData);
    const pxr::SdfPath& Id = GetId();

    const int NumPoints = m_Topology.GetNumPoints();

    const HnRenderPass::SupportedVertexInputsSetType SupportedPrimvars = GetSupportedPrimvars(SceneDelegate.GetRenderIndex(), GetMaterialId(), m_Topology);

    auto AddPrimvarSource = [&](const pxr::HdPrimvarDescriptor& PrimDesc) {
        if (!pxr::HdChangeTracker::IsPrimvarDirty(DirtyBits, Id, PrimDesc.name))
            return;

        // Skip unsupported primvars
        if (SupportedPrimvars.find(PrimDesc.name) == SupportedPrimvars.end())
            return;

        pxr::VtValue PrimValue = GetPrimvar(&SceneDelegate, PrimDesc.name);
        if (PrimValue.IsEmpty())
            return;

        if (auto BufferSource = CreateBufferSource(PrimDesc.name, PrimValue, NumPoints, Id))
        {
            m_StagingVertexData->Sources.emplace(PrimDesc.name, std::move(BufferSource));
        }
    };

    for (pxr::HdInterpolation Interpolation : {pxr::HdInterpolationVertex, pxr::HdInterpolationVarying})
    {
        pxr::HdPrimvarDescriptorVector PrimVarDescs = GetPrimvarDescriptors(&SceneDelegate, Interpolation);
        for (const pxr::HdPrimvarDescriptor& PrimDesc : PrimVarDescs)
        {
            AddPrimvarSource(PrimDesc);
        }

        pxr::HdExtComputationPrimvarDescriptorVector CompPrimvarsDescs = SceneDelegate.GetExtComputationPrimvarDescriptors(Id, Interpolation);
        for (const pxr::HdExtComputationPrimvarDescriptor& ExtCompPrimDesc : CompPrimvarsDescs)
        {
            AddPrimvarSource(ExtCompPrimDesc);
        }
    }
}

void HnMesh::UpdateFaceVaryingPrimvars(pxr::HdSceneDelegate& SceneDelegate,
                                       pxr::HdRenderParam*   RenderParam,