seed_from_upstream()

void MayaFlux::Nodes::Network::FieldOperator::seed_from_upstream ( const GraphicsOperator *  upstream )

overridevirtual

Seed vertex data from the upstream operator's current output.

Called by OperatorChain when consumes_upstream() is true. No-op if already initialised (m_count > 0) or if upstream is null. Derives vertex type from the upstream layout stride matching k_stride.

Reimplemented from MayaFlux::Nodes::Network::GraphicsOperator.

Definition at line 55 of file FieldOperator.cpp.

{
    if (m_count > 0 || !upstream)
        return;
 
    const auto data = upstream->get_vertex_data();
    const auto layout = upstream->get_vertex_layout();
    std::string type_name = upstream->get_vertex_type_name();
 
    if (type_name == "PointVertex") {
        m_vertex_type = VertexType::POINT;
    } else if (type_name == "LineVertex") {
        m_vertex_type = VertexType::LINE;
    } else if (type_name == "MeshVertex") {
        m_vertex_type = VertexType::MESH;
    } else {
        MF_WARN(Journal::Component::Nodes, Journal::Context::NodeProcessing,
            "FieldOperator::seed_from_upstream: unrecognized vertex type '{}', defaulting to LineVertex",
            type_name);
        m_vertex_type = VertexType::LINE;
    }
 
    if (data.empty() || layout.stride_bytes == 0)
        return;
 
    if (layout.stride_bytes != k_stride) {
        MF_WARN(Journal::Component::Nodes, Journal::Context::NodeProcessing,
            "FieldOperator::seed_from_upstream: upstream stride {} != k_stride {}, skipping",
            layout.stride_bytes, k_stride);
        return;
    }
 
    const size_t count = data.size() / k_stride;
    if (count == 0)
        return;
 
    store_reference(data.data(), count);
 
    MF_DEBUG(Journal::Component::Nodes, Journal::Context::NodeProcessing,
        "FieldOperator seeded {} vertices from upstream '{}'",
        count, upstream->get_type_name());
}

References count, MayaFlux::Nodes::Network::NetworkOperator::get_type_name(), MayaFlux::Nodes::Network::GraphicsOperator::get_vertex_data(), MayaFlux::Nodes::Network::GraphicsOperator::get_vertex_layout(), MayaFlux::Nodes::Network::GraphicsOperator::get_vertex_type_name(), k_stride, LINE, m_count, m_vertex_type, MESH, MF_DEBUG, MF_WARN, MayaFlux::Journal::NodeProcessing, MayaFlux::Journal::Nodes, POINT, and store_reference().

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