node_geo_material_replace.cc

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "node_geometry_util.hh"
 
#include "DNA_mesh_types.h"
 
#include "BKE_grease_pencil.hh"
 
namespace blender::nodes::node_geo_material_replace_cc {
 
static void node_declare(NodeDeclarationBuilder &b)
{
  b.use_custom_socket_order();
  b.allow_any_socket_order();
  b.add_input<decl::Geometry>("Geometry")
      .supported_type({GeometryComponent::Type::Mesh, GeometryComponent::Type::GreasePencil});
  b.add_output<decl::Geometry>("Geometry").propagate_all().align_with_previous();
  b.add_input<decl::Material>("Old");
  b.add_input<decl::Material>("New").translation_context(BLT_I18NCONTEXT_ID_MATERIAL);
}
 
static void replace_materials(MutableSpan<Material *> materials,
                              Material *src_material,
                              Material *dst_material)
{
  for (const int i : materials.index_range()) {
    if (materials[i] == src_material) {
      materials[i] = dst_material;
    }
  }
}
 
static void node_geo_exec(GeoNodeExecParams params)
{
  Material *old_material = params.extract_input<Material *>("Old");
  Material *new_material = params.extract_input<Material *>("New");
 
  GeometrySet geometry_set = params.extract_input<GeometrySet>("Geometry");
 
  geometry_set.modify_geometry_sets([&](GeometrySet &geometry_set) {
    if (Mesh *mesh = geometry_set.get_mesh_for_write()) {
      replace_materials({mesh->mat, mesh->totcol}, old_material, new_material);
    }
    if (GreasePencil *grease_pencil = geometry_set.get_grease_pencil_for_write()) {
      replace_materials({grease_pencil->material_array, grease_pencil->material_array_num},
                        old_material,
                        new_material);
    }
  });
 
  params.set_output("Geometry", std::move(geometry_set));
}
 
static void node_register()
{
  static blender::bke::bNodeType ntype;
 
  geo_node_type_base(&ntype, "GeometryNodeReplaceMaterial", GEO_NODE_REPLACE_MATERIAL);
  ntype.ui_name = "Replace Material";
  ntype.ui_description = "Swap one material with another";
  ntype.enum_name_legacy = "REPLACE_MATERIAL";
  ntype.nclass = NODE_CLASS_GEOMETRY;
  ntype.declare = node_declare;
  ntype.geometry_node_execute = node_geo_exec;
  blender::bke::node_register_type(ntype);
}
NOD_REGISTER_NODE(node_register)
 
}  // namespace blender::nodes::node_geo_material_replace_cc