Method UpdateDrawList

Hydrogent/src/HnRenderPass.cpp:566–664

}

void HnRenderPass::UpdateDrawList(const pxr::TfTokenVector& RenderTags)
{
    pxr::HdRenderIndex*  pRenderIndex    = GetRenderIndex();
    HnRenderDelegate*    pRenderDelegate = static_cast<HnRenderDelegate*>(pRenderIndex->GetRenderDelegate());
    const HnRenderParam* pRenderParam    = static_cast<const HnRenderParam*>(pRenderDelegate->GetRenderParam());
    if (pRenderParam == nullptr)
    {
        UNEXPECTED("Render param is null");
        return;
    }

    bool DrawListDirty = false;
    if (pRenderParam->GetSelectedPrimId() != m_SelectedPrimId)
    {
        m_SelectedPrimId = pRenderParam->GetSelectedPrimId();
        // Only update draw list, but not the draw items list
        DrawListDirty = true;
    }

    const pxr::HdRprimCollection& Collection  = GetRprimCollection();
    const pxr::HdChangeTracker&   Tracker     = pRenderIndex->GetChangeTracker();
    const pxr::TfToken&           MaterialTag = Collection.GetMaterialTag();

    const unsigned int CollectionVersion          = Tracker.GetCollectionVersion(Collection.GetName());
    const unsigned int RprimRenderTagVersion      = Tracker.GetRenderTagVersion();
    const unsigned int TaskRenderTagsVersion      = Tracker.GetTaskRenderTagsVersion();
    const unsigned int GeomSubsetDrawItemsVersion = pRenderParam->GetAttribVersion(HnRenderParam::GlobalAttrib::GeometrySubsetDrawItems);

    const bool CollectionChanged          = (m_GlobalAttribVersions.Collection != CollectionVersion);
    const bool RprimRenderTagChanged      = (m_GlobalAttribVersions.RprimRenderTag != RprimRenderTagVersion);
    const bool MaterialTagChanged         = (m_MaterialTag != MaterialTag);
    const bool GeomSubsetDrawItemsChanged = (m_GlobalAttribVersions.GeomSubsetDrawItems != GeomSubsetDrawItemsVersion);

    bool TaskRenderTagsChanged = false;
    if (m_GlobalAttribVersions.TaskRenderTags != TaskRenderTagsVersion)
    {
        m_GlobalAttribVersions.TaskRenderTags = TaskRenderTagsVersion;
        if (m_RenderTags != RenderTags)
        {
            m_RenderTags          = RenderTags;
            TaskRenderTagsChanged = true;
        }
    }

    // Do not update draw items list when selection changes as GetDrawItems() is an expensive call.
    if (CollectionChanged ||
        RprimRenderTagChanged ||
        MaterialTagChanged ||
        GeomSubsetDrawItemsChanged ||
        TaskRenderTagsChanged)
    {
        m_DrawItems.clear();
        //const HnRenderParam* const RenderParam = static_cast<HnRenderParam*>(pRenderIndex->GetRenderDelegate()->GetRenderParam());
        //if (RenderParam->HasMaterialTag(Collection.GetMaterialTag()))
        {
            m_DrawItems = pRenderIndex->GetDrawItems(Collection, RenderTags);
            // GetDrawItems() uses multithreading, so the order of draw items is not deterministic.
            std::sort(m_DrawItems.begin(), m_DrawItems.end());