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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "BKE_mesh.h"
#include "BKE_mesh_runtime.h"
#include "bmesh.h"
#include "bmesh_tools.h"
#include "node_geometry_util.hh"
namespace blender::nodes::node_geo_edge_split_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Geometry>(N_("Mesh")).supported_type(GEO_COMPONENT_TYPE_MESH);
b.add_input<decl::Bool>(N_("Selection")).default_value(true).hide_value().supports_field();
b.add_output<decl::Geometry>(N_("Mesh"));
}
static Mesh *mesh_edge_split(const Mesh &mesh, const IndexMask selection)
{
BMeshCreateParams bmesh_create_params{};
bmesh_create_params.use_toolflags = true;
const BMAllocTemplate allocsize = {0, 0, 0, 0};
BMesh *bm = BM_mesh_create(&allocsize, &bmesh_create_params);
BMeshFromMeshParams bmesh_from_mesh_params{};
bmesh_from_mesh_params.cd_mask_extra.vmask = CD_MASK_ORIGINDEX;
bmesh_from_mesh_params.cd_mask_extra.emask = CD_MASK_ORIGINDEX;
bmesh_from_mesh_params.cd_mask_extra.pmask = CD_MASK_ORIGINDEX;
BM_mesh_bm_from_me(bm, &mesh, &bmesh_from_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, nullptr, &mesh);
BM_mesh_free(bm);
return result;
}
static void node_geo_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::node_geo_edge_split_cc
void register_node_type_geo_edge_split()
{
namespace file_ns = blender::nodes::node_geo_edge_split_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_SPLIT_EDGES, "Split Edges", NODE_CLASS_GEOMETRY);
ntype.geometry_node_execute = file_ns::node_geo_exec;
ntype.declare = file_ns::node_declare;
nodeRegisterType(&ntype);
}
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