group_nodes.cc

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/* SPDX-FileCopyrightText: 2011-2022 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "group_nodes.h"
#include "node_parser.h"
 
#include "BLI_vector.hh"
 
#include "BKE_node.hh"
#include "BKE_node_runtime.hh"
 
namespace blender::nodes::materialx {
 
GroupNodeParser::GroupNodeParser(MaterialX::GraphElement *graph,
                                 const Depsgraph *depsgraph,
                                 const Material *material,
                                 const bNode *node,
                                 const bNodeSocket *socket_out,
                                 NodeItem::Type to_type,
                                 GroupNodeParser *group_parser,
                                 ExportParams export_params,
                                 bool use_group_default)
    : NodeParser(
          graph, depsgraph, material, node, socket_out, to_type, group_parser, export_params),
      use_group_default_(use_group_default)
{
}
 
NodeItem GroupNodeParser::compute()
{
  NodeItem res = empty();
 
  const bNodeTree *ngroup = reinterpret_cast<const bNodeTree *>(node_->id);
  ngroup->ensure_topology_cache();
  const bNode *node_out = ngroup->group_output_node();
  if (!node_out) {
    return res;
  }
 
  MaterialX::GraphElement *graph = graph_;
#ifdef USE_MATERIALX_NODEGRAPH
  std::string name = MaterialX::createValidName(ngroup->id.name);
  MaterialX::NodeGraphPtr group_graph = graph_->getChildOfType<MaterialX::NodeGraph>(name);
  if (!group_graph) {
    CLOG_INFO(LOG_MATERIALX_SHADER, 1, "<nodegraph name=%s>", name.c_str());
    group_graph = graph_->addChild<MaterialX::NodeGraph>(name);
  }
  graph = group_graph.get();
#endif
 
  NodeItem out = GroupOutputNodeParser(graph,
                                       depsgraph_,
                                       material_,
                                       node_out,
                                       socket_out_,
                                       to_type_,
                                       this,
                                       export_params_,
                                       use_group_default_)
                     .compute_full();
 
#ifdef USE_MATERIALX_NODEGRAPH
  /* We have to be in NodeParser's graph_, therefore copying output */
  res.output = out.output;
#else
  res = out;
#endif
  return res;
}
 
NodeItem GroupNodeParser::compute_full()
{
  NodeItem res = compute();
  if (NodeItem::is_arithmetic(to_type_)) {
    res = res.convert(to_type_);
  }
  return res;
}
 
NodeItem GroupOutputNodeParser::compute()
{
#ifdef USE_MATERIALX_NODEGRAPH
  Vector<NodeItem> values;
  for (auto socket_in : node_->input_sockets()) {
    NodeItem value = get_input_value(
        socket_in->index(), NodeItem::is_arithmetic(to_type_) ? NodeItem::Type::Any : to_type_);
    if (value.value) {
      value = create_node("constant", value.type(), {{"value", value}});
    }
    values.append(value);
  }
  Vector<NodeItem> outputs;
  for (int i = 0; i < values.size(); ++i) {
    if (values[i]) {
      outputs.append(create_output(out_name(node_->input_sockets()[i]), values[i]));
    }
  }
  return outputs[socket_out_->index()];
#else
  if (use_group_default_) {
    return get_input_value(socket_out_->index(), to_type_);
  }
  return get_input_link(socket_out_->index(), to_type_);
#endif
}
 
NodeItem GroupOutputNodeParser::compute_full()
{
  CLOG_INFO(LOG_MATERIALX_SHADER,
            1,
            "%s [%d] => %s",
            node_->name,
            node_->typeinfo->type,
            NodeItem::type(to_type_).c_str());
 
#ifdef USE_MATERIALX_NODEGRAPH
  NodeItem res = empty();
 
  /* Checking if output was already computed */
  res.output = graph_->getOutput(out_name(socket_out_));
  if (res.output) {
    return res;
  }
 
  res = compute();
  return res;
#else
  return compute();
#endif
}
 
std::string GroupOutputNodeParser::out_name(const bNodeSocket *out_socket)
{
  return MaterialX::createValidName(std::string("out_") + out_socket->name);
}
 
NodeItem GroupInputNodeParser::compute()
{
#ifdef USE_MATERIALX_NODEGRAPH
  NodeItem value = group_parser_->get_input_link(socket_out_->index(), to_type_);
  if (!value) {
    return empty();
  }
 
  if (value.value) {
    value = group_parser_->create_node("constant", value.type(), {{"value", value}});
  }
  return create_input(in_name(), value);
#else
  if (use_group_default_) {
    return group_parser_->get_input_value(socket_out_->index(), to_type_);
  }
  return group_parser_->get_input_link(socket_out_->index(), to_type_);
#endif
}
 
NodeItem GroupInputNodeParser::compute_full()
{
  CLOG_INFO(LOG_MATERIALX_SHADER,
            1,
            "%s [%d] => %s",
            node_->name,
            node_->typeinfo->type,
            NodeItem::type(to_type_).c_str());
 
#ifdef USE_MATERIALX_NODEGRAPH
  NodeItem res = empty();
 
  /* Checking if input was already computed */
  res.input = graph_->getInput(in_name());
  if (res.input) {
    return res;
  }
 
  res = compute();
  return res;
#else
  return compute();
#endif
}
 
std::string GroupInputNodeParser::in_name() const
{
  return MaterialX::createValidName(std::string("in_") + socket_out_->name);
}
 
}  // namespace blender::nodes::materialx