node_geo_curve_topology_curve_of_point.cc

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "BKE_curves.hh"
 
#include "node_geometry_util.hh"
 
namespace blender::nodes::node_geo_curve_topology_curve_of_point_cc {
 
static void node_declare(NodeDeclarationBuilder &b)
{
  b.add_input<decl::Int>("Point Index")
      .implicit_field(implicit_field_inputs::index)
      .description("The control point to retrieve data from");
  b.add_output<decl::Int>("Curve Index")
      .field_source_reference_all()
      .description("The curve the control point is part of");
  b.add_output<decl::Int>("Index in Curve")
      .field_source_reference_all()
      .description("How far along the control point is along its curve");
}
 
class CurveOfPointInput final : public bke::CurvesFieldInput {
 public:
  CurveOfPointInput() : bke::CurvesFieldInput(CPPType::get<int>(), "Point Curve Index")
  {
    category_ = Category::Generated;
  }
 
  GVArray get_varray_for_context(const bke::CurvesGeometry &curves,
                                 const AttrDomain domain,
                                 const IndexMask & /*mask*/) const final
  {
    if (domain != AttrDomain::Point) {
      return {};
    }
    return VArray<int>::ForContainer(curves.point_to_curve_map());
  }
 
  uint64_t hash() const override
  {
    return 413209687345908697;
  }
 
  bool is_equal_to(const fn::FieldNode &other) const override
  {
    return dynamic_cast<const CurveOfPointInput *>(&other) != nullptr;
  }
 
  std::optional<AttrDomain> preferred_domain(const bke::CurvesGeometry & /*curves*/) const final
  {
    return AttrDomain::Point;
  }
};
 
class PointIndexInCurveInput final : public bke::CurvesFieldInput {
 public:
  PointIndexInCurveInput() : bke::CurvesFieldInput(CPPType::get<int>(), "Point Index in Curve")
  {
    category_ = Category::Generated;
  }
 
  GVArray get_varray_for_context(const bke::CurvesGeometry &curves,
                                 const AttrDomain domain,
                                 const IndexMask & /*mask*/) const final
  {
    if (domain != AttrDomain::Point) {
      return {};
    }
    const Span<int> offsets = curves.offsets();
    Array<int> point_to_curve_map = curves.point_to_curve_map();
    return VArray<int>::ForFunc(
        curves.points_num(),
        [offsets, point_to_curve_map = std::move(point_to_curve_map)](const int point_i) {
          const int curve_i = point_to_curve_map[point_i];
          return point_i - offsets[curve_i];
        });
  }
 
  uint64_t hash() const final
  {
    return 9834765987345677;
  }
 
  bool is_equal_to(const fn::FieldNode &other) const final
  {
    return dynamic_cast<const PointIndexInCurveInput *>(&other) != nullptr;
  }
 
  std::optional<AttrDomain> preferred_domain(const bke::CurvesGeometry & /*curves*/) const override
  {
    return AttrDomain::Point;
  }
};
 
static void node_geo_exec(GeoNodeExecParams params)
{
  const Field<int> point_index = params.extract_input<Field<int>>("Point Index");
  if (params.output_is_required("Curve Index")) {
    params.set_output(
        "Curve Index",
        Field<int>(std::make_shared<bke::EvaluateAtIndexInput>(
            point_index, Field<int>(std::make_shared<CurveOfPointInput>()), AttrDomain::Point)));
  }
  if (params.output_is_required("Index in Curve")) {
    params.set_output("Index in Curve",
                      Field<int>(std::make_shared<bke::EvaluateAtIndexInput>(
                          point_index,
                          Field<int>(std::make_shared<PointIndexInCurveInput>()),
                          AttrDomain::Point)));
  }
}
 
static void node_register()
{
  static blender::bke::bNodeType ntype;
  geo_node_type_base(
      &ntype, GEO_NODE_CURVE_TOPOLOGY_CURVE_OF_POINT, "Curve of Point", NODE_CLASS_INPUT);
  ntype.geometry_node_execute = node_geo_exec;
  ntype.declare = node_declare;
  blender::bke::node_register_type(&ntype);
}
NOD_REGISTER_NODE(node_register)
 
}  // namespace blender::nodes::node_geo_curve_topology_curve_of_point_cc