Method addNodeDefFromGraph

source/MaterialXCore/Document.cpp:180–259

}

NodeDefPtr Document::addNodeDefFromGraph(NodeGraphPtr nodeGraph, const string& nodeDefName,
                                         const string& category, const string& newGraphName)
{
    if (category.empty())
    {
        throw Exception("Cannot create a nodedef without a category identifier");
    }

    if (getNodeDef(nodeDefName))
    {
        throw Exception("Cannot create duplicate nodedef: " + nodeDefName);
    }

    if (getNodeGraph(newGraphName))
    {
        throw Exception("Cannot create duplicate nodegraph: " + newGraphName);
    }

    // Create a new functional nodegraph, and copy over the
    // contents from the compound nodegraph
    NodeGraphPtr graph = addNodeGraph(newGraphName);
    graph->copyContentFrom(nodeGraph);

    for (auto graphChild : graph->getChildren())
    {
        graphChild->removeAttribute(Element::XPOS_ATTRIBUTE);
        graphChild->removeAttribute(Element::YPOS_ATTRIBUTE);
    }
    graph->setNodeDefString(nodeDefName);

    // Create a new nodedef and set its category
    NodeDefPtr nodeDef = addNodeDef(nodeDefName, EMPTY_STRING);
    nodeDef->setNodeString(category);

    // Expose any existing interfaces from the graph.
    // Any connection attributes ("nodegraph", "nodename", "interfacename") on the
    // existing interface should be removed from the definition as well as any source URI.

    // Attributes which should not be copied over
    StringSet filterAttributes = { PortElement::NODE_GRAPH_ATTRIBUTE, PortElement::NODE_NAME_ATTRIBUTE,
                                   PortElement::INTERFACE_NAME_ATTRIBUTE, Element::XPOS_ATTRIBUTE, Element::YPOS_ATTRIBUTE };

    // Transfer input interface from the graph to the nodedef
    for (InputPtr input : graph->getInputs())
    {
        InputPtr nodeDefInput = nodeDef->addInput(input->getName(), input->getType());
        if (nodeDefInput)
        {
            nodeDefInput->copyContentFrom(input);
            for (const string& filterAttribute : filterAttributes)
            {
                nodeDefInput->removeAttribute(filterAttribute);
            }
            nodeDefInput->setSourceUri(EMPTY_STRING);
            input->setInterfaceName(nodeDefInput->getName());
        }
    }
    // Remove interfaces from the nodegraph