1 files changed, 92 insertions, 0 deletions
diff --git a/source/blender/nodes/geometry/nodes/legacy/node_geo_select_by_material.cc b/source/blender/nodes/geometry/nodes/legacy/node_geo_select_by_material.cc
new file mode 100644
index 00000000000..eabdd2bcd5a
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+++ b/source/blender/nodes/geometry/nodes/legacy/node_geo_select_by_material.cc
@@ -0,0 +1,92 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "node_geometry_util.hh"
+
+#include "UI_interface.h"
+#include "UI_resources.h"
+
+#include "DNA_mesh_types.h"
+#include "DNA_meshdata_types.h"
+
+#include "BLI_task.hh"
+
+#include "BKE_material.h"
+
+namespace blender::nodes {
+
+static void geo_node_legacy_select_by_material_declare(NodeDeclarationBuilder &b)
+{
+  b.add_input<decl::Geometry>("Geometry");
+  b.add_input<decl::Material>("Material").hide_label();
+  b.add_input<decl::String>("Selection");
+  b.add_output<decl::Geometry>("Geometry");
+}
+
+static void select_mesh_by_material(const Mesh &mesh,
+                                    const Material *material,
+                                    const MutableSpan<bool> r_selection)
+{
+  BLI_assert(mesh.totpoly == r_selection.size());
+  Vector<int> material_indices;
+  for (const int i : IndexRange(mesh.totcol)) {
+    if (mesh.mat[i] == material) {
+      material_indices.append(i);
+    }
+  }
+  threading::parallel_for(r_selection.index_range(), 1024, [&](IndexRange range) {
+    for (const int i : range) {
+      r_selection[i] = material_indices.contains(mesh.mpoly[i].mat_nr);
+    }
+  });
+}
+
+static void geo_node_legacy_select_by_material_exec(GeoNodeExecParams params)
+{
+  Material *material = params.extract_input<Material *>("Material");
+  const std::string selection_name = params.extract_input<std::string>("Selection");
+
+  GeometrySet geometry_set = params.extract_input<GeometrySet>("Geometry");
+  geometry_set = geometry_set_realize_instances(geometry_set);
+
+  if (geometry_set.has<MeshComponent>()) {
+    MeshComponent &mesh_component = geometry_set.get_component_for_write<MeshComponent>();
+    const Mesh *mesh = mesh_component.get_for_read();
+    if (mesh != nullptr) {
+      OutputAttribute_Typed<bool> selection =
+          mesh_component.attribute_try_get_for_output_only<bool>(selection_name, ATTR_DOMAIN_FACE);
+      if (selection) {
+        select_mesh_by_material(*mesh, material, selection.as_span());
+        selection.save();
+      }
+    }
+  }
+
+  params.set_output("Geometry", std::move(geometry_set));
+}
+
+}  // namespace blender::nodes
+
+void register_node_type_geo_legacy_select_by_material()
+{
+  static bNodeType ntype;
+
+  geo_node_type_base(
+      &ntype, GEO_NODE_LEGACY_SELECT_BY_MATERIAL, "Select by Material", NODE_CLASS_GEOMETRY, 0);
+  ntype.declare = blender::nodes::geo_node_legacy_select_by_material_declare;
+  ntype.geometry_node_execute = blender::nodes::geo_node_legacy_select_by_material_exec;
+  nodeRegisterType(&ntype);
+}