1 files changed, 121 insertions, 0 deletions
diff --git a/source/blender/nodes/geometry/nodes/node_geo_curve_topology_curve_of_point.cc b/source/blender/nodes/geometry/nodes/node_geo_curve_topology_curve_of_point.cc
new file mode 100644
index 00000000000..4d60ab939ca
--- /dev/null
+++ b/source/blender/nodes/geometry/nodes/node_geo_curve_topology_curve_of_point.cc
@@ -0,0 +1,121 @@
+/* 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>(N_("Point Index"))
+      .implicit_field(implicit_field_inputs::index)
+      .description(N_("The control point to retrieve data from"));
+  b.add_output<decl::Int>(N_("Curve Index"))
+      .dependent_field()
+      .description(N_("The curve the control point is part of"));
+  b.add_output<decl::Int>(N_("Index in Curve"))
+      .dependent_field()
+      .description(N_("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 eAttrDomain domain,
+                                 const IndexMask /*mask*/) const final
+  {
+    if (domain != ATTR_DOMAIN_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
+  {
+    if (dynamic_cast<const CurveOfPointInput *>(&other)) {
+      return true;
+    }
+    return false;
+  }
+};
+
+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 eAttrDomain domain,
+                                 const IndexMask /*mask*/) const final
+  {
+    if (domain != ATTR_DOMAIN_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
+  {
+    if (dynamic_cast<const PointIndexInCurveInput *>(&other)) {
+      return true;
+    }
+    return false;
+  }
+};
+
+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<FieldAtIndexInput>(
+            point_index, Field<int>(std::make_shared<CurveOfPointInput>()), ATTR_DOMAIN_POINT)));
+  }
+  if (params.output_is_required("Index in Curve")) {
+    params.set_output("Index in Curve",
+                      Field<int>(std::make_shared<FieldAtIndexInput>(
+                          point_index,
+                          Field<int>(std::make_shared<PointIndexInCurveInput>()),
+                          ATTR_DOMAIN_POINT)));
+  }
+}
+
+}  // namespace blender::nodes::node_geo_curve_topology_curve_of_point_cc
+
+void register_node_type_geo_curve_topology_curve_of_point()
+{
+  namespace file_ns = blender::nodes::node_geo_curve_topology_curve_of_point_cc;
+
+  static bNodeType ntype;
+  geo_node_type_base(
+      &ntype, GEO_NODE_CURVE_TOPOLOGY_CURVE_OF_POINT, "Curve of Point", NODE_CLASS_INPUT);
+  ntype.geometry_node_execute = file_ns::node_geo_exec;
+  ntype.declare = file_ns::node_declare;
+  nodeRegisterType(&ntype);
+}