source/blender/nodes/shader/CMakeLists.txt

@@ -149,10 +149,12 @@ if(WITH_MATERIALX)
     materialx/material.cc
     materialx/node_item.cc
     materialx/node_parser.cc
+    materialx/group_nodes.cc
 
     materialx/material.h
     materialx/node_item.h
     materialx/node_parser.h
+    materialx/group_nodes.h
   )
   list(APPEND LIB
     MaterialXCore

source/blender/nodes/shader/materialx/group_nodes.cc

@@ -0,0 +1,65 @@
+/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include "node_parser.h"
+#include "group_nodes.h"
+
+namespace blender::nodes::materialx {
+
+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;
+  }
+
+  std::string name = MaterialX::createValidName(node_->name); /* or ngroup->name */
+  MaterialX::NodeGraphPtr group_graph = graph_->getChildOfType<MaterialX::NodeGraph>(name);
+  if (!group_graph) {
+    group_graph = graph_->addChild<MaterialX::NodeGraph>(name);
+  }
+
+  GroupOutputNodeParser parser(
+      group_graph.get(), depsgraph_, material_, node_out, socket_out_, NodeItem::Type::Any);
+  NodeItem out = parser.compute_full();
+  res.node = group_graph;
+  if (parser.output) {
+    res = create_node("constant", out.type());
+    res.set_input("value", parser.output);
+  }
+  return res;
+}
+
+NodeItem GroupOutputNodeParser::compute()
+{
+  NodeItem res = get_input_link(socket_out_->index(), to_type_);
+  if (res) {
+    output = graph_->addOutput(MaterialX::EMPTY_STRING, NodeItem::type(res.type()));
+    output->setValue(1.0f);
+  }
+  return res;
+}
+
+NodeItem GroupInputNodeParser::compute()
+{
+  return empty();
+}
+
+NodeItem GroupInputNodeParser::compute_full()
+{
+  CLOG_INFO(LOG_MATERIALX_SHADER,
+            1,
+            "%s [%d] => %s",
+            node_->name,
+            node_->typeinfo->type,
+            NodeItem::type(to_type_).c_str());
+
+  return compute();
+}
+
+}  // namespace blender::nodes::materialx

source/blender/nodes/shader/materialx/group_nodes.h

@@ -0,0 +1,33 @@
+/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+#pragma once
+
+#include "node_parser.h"
+
+namespace blender::nodes::materialx {
+
+class GroupNodeParser : public NodeParser {
+ public:
+  using NodeParser::NodeParser;
+  NodeItem compute() override;
+};
+
+class GroupOutputNodeParser : public NodeParser {
+ public:
+  MaterialX::OutputPtr output;
+
+ public:
+  using NodeParser::NodeParser;
+  NodeItem compute() override;
+};
+
+class GroupInputNodeParser : public NodeParser {
+ public:
+  using NodeParser::NodeParser;
+  NodeItem compute() override;
+  NodeItem compute_full() override;
+};
+
+}  // namespace blender::nodes::materialx

source/blender/nodes/shader/materialx/node_item.cc

@@ -675,13 +675,15 @@ void NodeItem::set_input(const std::string &in_name, const NodeItem &item)
   }
 }
 
+void NodeItem::set_input(const std::string &in_name, MaterialX::OutputPtr output)
+{
+  node->setConnectedOutput(in_name, output);
+}
+
 void NodeItem::set_input_output(const std::string &in_name,
                                 const NodeItem &item,
                                 const std::string &out_name)
 {
-  if (!item.node) {
-    BLI_assert_unreachable();
-  }
   node->setConnectedNode(in_name, item.node);
   node->setConnectedOutput(in_name, item.node->getOutput(out_name));
 }

source/blender/nodes/shader/materialx/node_item.h

@@ -104,6 +104,7 @@ class NodeItem {
   /* Functions to set input and output */
   template<class T> void set_input(const std::string &in_name, const T &value, Type in_type);
   void set_input(const std::string &in_name, const NodeItem &item);
+  void set_input(const std::string &in_name, MaterialX::OutputPtr output);
   void set_input_output(const std::string &in_name,
                         const NodeItem &item,
                         const std::string &out_name);

source/blender/nodes/shader/materialx/node_parser.cc

@@ -4,6 +4,8 @@
 
 #include "node_parser.h"
 
+#include "group_nodes.h"
+
 #include "BKE_node_runtime.hh"
 
 namespace blender::nodes::materialx {
@@ -54,7 +56,7 @@ NodeItem NodeParser::compute_full()
   return res;
 }
 
-std::string NodeParser::node_name()
+std::string NodeParser::node_name() const
 {
   std::string name = node_->name;
   if (node_->output_sockets().size() > 1) {
@@ -155,7 +157,7 @@ NodeItem NodeParser::get_input_link(const bNodeSocket &socket, NodeItem::Type to
   const bNode *from_node = link->fromnode;
 
   /* Passing NODE_REROUTE nodes */
-  while (from_node->type == NODE_REROUTE) {
+  while (from_node->is_reroute()) {
     link = from_node->input_socket(0).link;
     if (!(link && link->is_used())) {
       return empty();
@@ -163,6 +165,11 @@ NodeItem NodeParser::get_input_link(const bNodeSocket &socket, NodeItem::Type to
     from_node = link->fromnode;
   }
 
+  if (from_node->is_group()) {
+    return GroupNodeParser(graph_, depsgraph_, material_, from_node, link->fromsock, to_type)
+        .compute_full();
+  }
+
   if (!from_node->typeinfo->materialx_fn) {
     CLOG_WARN(LOG_MATERIALX_SHADER,
               "Unsupported node: %s [%d]",

source/blender/nodes/shader/materialx/node_parser.h

@@ -38,7 +38,7 @@ class NodeParser {
   virtual NodeItem compute_full();
 
  protected:
-  std::string node_name();
+  std::string node_name() const;
   NodeItem create_node(const std::string &category, NodeItem::Type type);
   NodeItem get_input_default(const std::string &name, NodeItem::Type to_type);
   NodeItem get_input_default(int index, NodeItem::Type to_type);

source/blender/nodes/shader/nodes/node_shader_tex_noise.cc

@@ -260,7 +260,7 @@ static void sh_node_noise_build_multi_function(NodeMultiFunctionBuilder &builder
 NODE_SHADER_MATERIALX_BEGIN
 {
   NodeItem scale = get_input_value("Scale", NodeItem::Type::Float);
-  NodeItem detail = get_input_value("Detail", NodeItem::Type::Float);
+  NodeItem detail = get_input_default("Detail", NodeItem::Type::Float);
   NodeItem lacunarity = get_input_value("Lacunarity", NodeItem::Type::Float);
 
   NodeItem position = create_node("position", NodeItem::Type::Vector3);
@@ -268,9 +268,7 @@ NODE_SHADER_MATERIALX_BEGIN
 
   NodeItem res = create_node("fractal3d", NodeItem::Type::Color3);
   res.set_input("position", position);
-  if (detail.value) {
-    res.set_input("octaves", val(int(detail.value->asA<float>())));
-  }
+  res.set_input("octaves", val(int(detail.value->asA<float>())));
   res.set_input("lacunarity", lacunarity);
   return res;
 }