Method ProcessDrawItems

Hydrogent/src/HnMesh.cpp:105–142

template <typename HandleDrawItemFuncType, typename HandleGeomSubsetDrawItemFuncType>
void HnMesh::ProcessDrawItems(HandleDrawItemFuncType&&           HandleDrawItem,
                              HandleGeomSubsetDrawItemFuncType&& HandleGeomSubsetDrawItem)
{
    const pxr::HdGeomSubsets& GeomSubsets    = m_Topology.GetGeomSubsets();
    const size_t              NumGeomSubsets = GeomSubsets.size();
    for (auto const& token_repr : _reprs)
    {
        const pxr::TfToken&        Token = token_repr.first;
        pxr::HdReprSharedPtr       Repr  = token_repr.second;
        _MeshReprConfig::DescArray Descs = _GetReprDesc(Token);

        size_t DrawItemIdx       = 0;
        size_t GeomSubsetDescIdx = 0;
        for (const pxr::HdMeshReprDesc& Desc : Descs)
        {
            if (Desc.geomStyle == pxr::HdMeshGeomStyleInvalid)
                continue;

            {
                pxr::HdDrawItem* Item = Repr->GetDrawItem(DrawItemIdx++);
                HandleDrawItem(static_cast<HnDrawItem&>(*Item));
            }

            // Update geom subset draw items if they exist
            if (Desc.geomStyle != pxr::HdMeshGeomStylePoints)
            {
                for (size_t i = 0; i < NumGeomSubsets; ++i)
                {
                    if (pxr::HdDrawItem* Item = Repr->GetDrawItemForGeomSubset(GeomSubsetDescIdx, NumGeomSubsets, i))
                    {
                        HandleGeomSubsetDrawItem(GeomSubsets[i], static_cast<HnDrawItem&>(*Item));
                    }
                }
                ++GeomSubsetDescIdx;
            }
        }
    }
}

void HnMesh::UpdateReprMaterials(pxr::HdSceneDelegate* SceneDelegate,
                                 pxr::HdRenderParam*   RenderParam)