Differential D12829 Diff 43270 source/blender/nodes/geometry/nodes/node_geo_edge_split.cc

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source/blender/nodes/geometry/nodes/node_geo_edge_split.cc

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				/*
				* 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 "BKE_mesh.h"
				#include "BKE_mesh_runtime.h"

				#include "bmesh.h"
				#include "bmesh_tools.h"

				#include "node_geometry_util.hh"

				namespace blender::nodes {

				static void geo_node_edge_split_declare(NodeDeclarationBuilder &b)
				{
				b.add_input<decl::Geometry>("Mesh");
				b.add_input<decl::Bool>("Selection").default_value(true).hide_value().supports_field();
				b.add_output<decl::Geometry>("Mesh");
				}

				static Mesh *mesh_edge_split(const Mesh &mesh, const IndexMask selection)
				{
				const BMeshCreateParams bmcp = {true};
				const BMAllocTemplate allocsize = {0, 0, 0, 0};
				BMesh *bm = BM_mesh_create(&allocsize, &bmcp);

				BMeshFromMeshParams params{};
				BM_mesh_bm_from_me(bm, &mesh, &params);

				BM_mesh_elem_table_ensure(bm, BM_EDGE);
				for (const int i : selection) {
				BMEdge *edge = BM_edge_at_index(bm, i);
				BM_elem_flag_enable(edge, BM_ELEM_TAG);
				}

				BM_mesh_edgesplit(bm, false, true, false);

				Mesh *result = BKE_mesh_from_bmesh_for_eval_nomain(bm, NULL, &mesh);
				BM_mesh_free(bm);

				BKE_mesh_normals_tag_dirty(result);

				return result;
				}

				static void geo_node_edge_split_exec(GeoNodeExecParams params)
				{
				GeometrySet geometry_set = params.extract_input<GeometrySet>("Mesh");

				const Field<bool> selection_field = params.extract_input<Field<bool>>("Selection");

				geometry_set.modify_geometry_sets([&](GeometrySet &geometry_set) {
				if (!geometry_set.has_mesh()) {
				return;
				}

				const MeshComponent &mesh_component = *geometry_set.get_component_for_read<MeshComponent>();
				GeometryComponentFieldContext field_context{mesh_component, ATTR_DOMAIN_EDGE};
				const int domain_size = mesh_component.attribute_domain_size(ATTR_DOMAIN_EDGE);
				fn::FieldEvaluator selection_evaluator{field_context, domain_size};
				selection_evaluator.add(selection_field);
				selection_evaluator.evaluate();
				const IndexMask selection = selection_evaluator.get_evaluated_as_mask(0);

				geometry_set.replace_mesh(mesh_edge_split(*mesh_component.get_for_read(), selection));
				});

				params.set_output("Mesh", std::move(geometry_set));
				}

				} // namespace blender::nodes

				void register_node_type_geo_edge_split()
				{
				static bNodeType ntype;

				geo_node_type_base(&ntype, GEO_NODE_EDGE_SPLIT, "Edge Split", NODE_CLASS_GEOMETRY, 0);
				ntype.geometry_node_execute = blender::nodes::geo_node_edge_split_exec;
				ntype.declare = blender::nodes::geo_node_edge_split_declare;
				nodeRegisterType(&ntype);
				}