node_geo_separate_geometry.cc

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "NOD_rna_define.hh"
 
#include "UI_interface_layout.hh"
#include "UI_resources.hh"
 
#include "RNA_enum_types.hh"
 
#include "GEO_foreach_geometry.hh"
#include "GEO_separate_geometry.hh"
 
#include "node_geometry_util.hh"
 
namespace blender::nodes::node_geo_separate_geometry_cc {
 
NODE_STORAGE_FUNCS(NodeGeometrySeparateGeometry)
 
static void node_declare(NodeDeclarationBuilder &b)
{
  b.add_input<decl::Geometry>("Geometry").description("Geometry to split into two parts");
  b.add_input<decl::Bool>("Selection")
      .default_value(true)
      .hide_value()
      .field_on_all()
      .description("The parts of the geometry that go into the first output");
  b.add_output<decl::Geometry>("Selection")
      .propagate_all()
      .description("The parts of the geometry in the selection");
  b.add_output<decl::Geometry>("Inverted")
      .propagate_all()
      .description("The parts of the geometry not in the selection");
}
 
static void node_layout(uiLayout *layout, bContext * /*C*/, PointerRNA *ptr)
{
  layout->prop(ptr, "domain", UI_ITEM_NONE, "", ICON_NONE);
}
 
static void node_init(bNodeTree * /*tree*/, bNode *node)
{
  NodeGeometrySeparateGeometry *data = MEM_callocN<NodeGeometrySeparateGeometry>(__func__);
  data->domain = int8_t(AttrDomain::Point);
  node->storage = data;
}
 
static void node_geo_exec(GeoNodeExecParams params)
{
  GeometrySet geometry_set = params.extract_input<GeometrySet>("Geometry");
 
  const Field<bool> selection_field = params.extract_input<Field<bool>>("Selection");
 
  const NodeGeometrySeparateGeometry &storage = node_storage(params.node());
  const AttrDomain domain = AttrDomain(storage.domain);
 
  auto separate_geometry_maybe_recursively = [&](GeometrySet &geometry_set,
                                                 const Field<bool> &selection,
                                                 const AttributeFilter &attribute_filter) {
    bool is_error;
    if (domain == AttrDomain::Instance) {
      /* Only delete top level instances. */
      geometry::separate_geometry(geometry_set,
                                  domain,
                                  GEO_NODE_DELETE_GEOMETRY_MODE_ALL,
                                  selection,
                                  attribute_filter,
                                  is_error);
    }
    else {
      geometry::foreach_real_geometry(geometry_set, [&](GeometrySet &geometry_set) {
        geometry::separate_geometry(geometry_set,
                                    domain,
                                    GEO_NODE_DELETE_GEOMETRY_MODE_ALL,
                                    selection,
                                    attribute_filter,
                                    is_error);
      });
    }
  };
 
  GeometrySet second_set(geometry_set);
  if (params.output_is_required("Selection")) {
    separate_geometry_maybe_recursively(
        geometry_set, selection_field, params.get_attribute_filter("Selection"));
    params.set_output("Selection", std::move(geometry_set));
  }
  if (params.output_is_required("Inverted")) {
    separate_geometry_maybe_recursively(second_set,
                                        fn::invert_boolean_field(selection_field),
                                        params.get_attribute_filter("Inverted"));
    params.set_output("Inverted", std::move(second_set));
  }
}
 
static void node_rna(StructRNA *srna)
{
  RNA_def_node_enum(srna,
                    "domain",
                    "Domain",
                    "Which domain to separate on",
                    rna_enum_attribute_domain_without_corner_items,
                    NOD_storage_enum_accessors(domain),
                    int(AttrDomain::Point));
}
 
static void node_register()
{
  static blender::bke::bNodeType ntype;
 
  geo_node_type_base(&ntype, "GeometryNodeSeparateGeometry", GEO_NODE_SEPARATE_GEOMETRY);
  ntype.ui_name = "Separate Geometry";
  ntype.ui_description = "Split a geometry into two geometry outputs based on a selection";
  ntype.enum_name_legacy = "SEPARATE_GEOMETRY";
  ntype.nclass = NODE_CLASS_GEOMETRY;
  blender::bke::node_type_storage(ntype,
                                  "NodeGeometrySeparateGeometry",
                                  node_free_standard_storage,
                                  node_copy_standard_storage);
 
  ntype.initfunc = node_init;
 
  ntype.declare = node_declare;
  ntype.geometry_node_execute = node_geo_exec;
  ntype.draw_buttons = node_layout;
  blender::bke::node_register_type(ntype);
 
  node_rna(ntype.rna_ext.srna);
}
NOD_REGISTER_NODE(node_register)
 
}  // namespace blender::nodes::node_geo_separate_geometry_cc