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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "BKE_mesh.h"
#include "BLI_disjoint_set.hh"
#include "node_geometry_util.hh"
namespace blender::nodes::node_geo_input_mesh_island_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_output<decl::Int>(N_("Island Index"))
.field_source()
.description(N_("The index of the each vertex's island. Indices are based on the "
"lowest vertex index contained in each island"));
b.add_output<decl::Int>(N_("Island Count"))
.field_source()
.description(N_("The total number of mesh islands"));
}
class IslandFieldInput final : public GeometryFieldInput {
public:
IslandFieldInput() : GeometryFieldInput(CPPType::get<int>(), "Island Index")
{
category_ = Category::Generated;
}
GVArray get_varray_for_context(const GeometryComponent &component,
const eAttrDomain domain,
IndexMask UNUSED(mask)) const final
{
if (component.type() != GEO_COMPONENT_TYPE_MESH) {
return {};
}
const MeshComponent &mesh_component = static_cast<const MeshComponent &>(component);
const Mesh *mesh = mesh_component.get_for_read();
if (mesh == nullptr) {
return {};
}
DisjointSet islands(mesh->totvert);
for (const int i : IndexRange(mesh->totedge)) {
islands.join(mesh->medge[i].v1, mesh->medge[i].v2);
}
Array<int> output(mesh->totvert);
VectorSet<int> ordered_roots;
for (const int i : IndexRange(mesh->totvert)) {
const int64_t root = islands.find_root(i);
output[i] = ordered_roots.index_of_or_add(root);
}
return mesh_component.attribute_try_adapt_domain<int>(
VArray<int>::ForContainer(std::move(output)), ATTR_DOMAIN_POINT, domain);
}
uint64_t hash() const override
{
/* Some random constant hash. */
return 635467354;
}
bool is_equal_to(const fn::FieldNode &other) const override
{
return dynamic_cast<const IslandFieldInput *>(&other) != nullptr;
}
};
class IslandCountFieldInput final : public GeometryFieldInput {
public:
IslandCountFieldInput() : GeometryFieldInput(CPPType::get<int>(), "Island Count")
{
category_ = Category::Generated;
}
GVArray get_varray_for_context(const GeometryComponent &component,
const eAttrDomain domain,
IndexMask UNUSED(mask)) const final
{
if (component.type() != GEO_COMPONENT_TYPE_MESH) {
return {};
}
const MeshComponent &mesh_component = static_cast<const MeshComponent &>(component);
const Mesh *mesh = mesh_component.get_for_read();
if (mesh == nullptr) {
return {};
}
DisjointSet islands(mesh->totvert);
for (const int i : IndexRange(mesh->totedge)) {
islands.join(mesh->medge[i].v1, mesh->medge[i].v2);
}
Set<int> island_list;
for (const int i_vert : IndexRange(mesh->totvert)) {
const int64_t root = islands.find_root(i_vert);
island_list.add(root);
}
return VArray<int>::ForSingle(island_list.size(), mesh_component.attribute_domain_num(domain));
}
uint64_t hash() const override
{
/* Some random hash. */
return 45634572457;
}
bool is_equal_to(const fn::FieldNode &other) const override
{
return dynamic_cast<const IslandCountFieldInput *>(&other) != nullptr;
}
};
static void node_geo_exec(GeoNodeExecParams params)
{
if (params.output_is_required("Island Index")) {
Field<int> field{std::make_shared<IslandFieldInput>()};
params.set_output("Island Index", std::move(field));
}
if (params.output_is_required("Island Count")) {
Field<int> field{std::make_shared<IslandCountFieldInput>()};
params.set_output("Island Count", std::move(field));
}
}
} // namespace blender::nodes::node_geo_input_mesh_island_cc
void register_node_type_geo_input_mesh_island()
{
namespace file_ns = blender::nodes::node_geo_input_mesh_island_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_INPUT_MESH_ISLAND, "Mesh Island", NODE_CLASS_INPUT);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
nodeRegisterType(&ntype);
}
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