1 files changed, 126 insertions, 0 deletions
diff --git a/source/blender/nodes/geometry/nodes/node_geo_mesh_topology_face_of_corner.cc b/source/blender/nodes/geometry/nodes/node_geo_mesh_topology_face_of_corner.cc
new file mode 100644
index 00000000000..2cf7ed2c687
--- /dev/null
+++ b/source/blender/nodes/geometry/nodes/node_geo_mesh_topology_face_of_corner.cc
@@ -0,0 +1,126 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include "BKE_mesh.h"
+#include "BKE_mesh_mapping.h"
+
+#include "node_geometry_util.hh"
+
+namespace blender::nodes::node_geo_mesh_topology_face_of_corner_cc {
+
+static void node_declare(NodeDeclarationBuilder &b)
+{
+  b.add_input<decl::Int>(N_("Corner Index"))
+      .implicit_field(implicit_field_inputs::index)
+      .description(
+          N_("The corner to retrieve data from. Defaults to the corner from the context"));
+  b.add_output<decl::Int>(N_("Face Index"))
+      .dependent_field()
+      .description(N_("The index of the face the corner is a part of"));
+  b.add_output<decl::Int>(N_("Index in Face"))
+      .dependent_field()
+      .description(N_("The index of the corner starting from the first corner in the face"));
+}
+
+class CornerFaceIndexInput final : public bke::MeshFieldInput {
+ public:
+  CornerFaceIndexInput() : bke::MeshFieldInput(CPPType::get<int>(), "Corner Face Index")
+  {
+    category_ = Category::Generated;
+  }
+
+  GVArray get_varray_for_context(const Mesh &mesh,
+                                 const eAttrDomain domain,
+                                 const IndexMask /*mask*/) const final
+  {
+    if (domain != ATTR_DOMAIN_CORNER) {
+      return {};
+    }
+    return VArray<int>::ForContainer(
+        bke::mesh_topology::build_loop_to_poly_map(mesh.polys(), mesh.totloop));
+  }
+
+  uint64_t hash() const final
+  {
+    return 2348712958475728;
+  }
+
+  bool is_equal_to(const fn::FieldNode &other) const final
+  {
+    return dynamic_cast<const CornerFaceIndexInput *>(&other) != nullptr;
+  }
+};
+
+class CornerIndexInFaceInput final : public bke::MeshFieldInput {
+ public:
+  CornerIndexInFaceInput() : bke::MeshFieldInput(CPPType::get<int>(), "Corner Index In Face")
+  {
+    category_ = Category::Generated;
+  }
+
+  GVArray get_varray_for_context(const Mesh &mesh,
+                                 const eAttrDomain domain,
+                                 const IndexMask /*mask*/) const final
+  {
+    if (domain != ATTR_DOMAIN_CORNER) {
+      return {};
+    }
+    const Span<MPoly> polys = mesh.polys();
+    Array<int> loop_to_poly_map = bke::mesh_topology::build_loop_to_poly_map(polys, mesh.totloop);
+    return VArray<int>::ForFunc(
+        mesh.totloop, [polys, loop_to_poly_map = std::move(loop_to_poly_map)](const int corner_i) {
+          const int poly_i = loop_to_poly_map[corner_i];
+          return corner_i - polys[poly_i].loopstart;
+        });
+  }
+
+  uint64_t hash() const final
+  {
+    return 97837176448;
+  }
+
+  bool is_equal_to(const fn::FieldNode &other) const final
+  {
+    if (dynamic_cast<const CornerIndexInFaceInput *>(&other)) {
+      return true;
+    }
+    return false;
+  }
+
+  std::optional<eAttrDomain> preferred_domain(const Mesh & /*mesh*/) const final
+  {
+    return ATTR_DOMAIN_CORNER;
+  }
+};
+
+static void node_geo_exec(GeoNodeExecParams params)
+{
+  const Field<int> corner_index = params.extract_input<Field<int>>("Corner Index");
+  if (params.output_is_required("Face Index")) {
+    params.set_output("Face Index",
+                      Field<int>(std::make_shared<FieldAtIndexInput>(
+                          corner_index,
+                          Field<int>(std::make_shared<CornerFaceIndexInput>()),
+                          ATTR_DOMAIN_CORNER)));
+  }
+  if (params.output_is_required("Index in Face")) {
+    params.set_output("Index in Face",
+                      Field<int>(std::make_shared<FieldAtIndexInput>(
+                          corner_index,
+                          Field<int>(std::make_shared<CornerIndexInFaceInput>()),
+                          ATTR_DOMAIN_CORNER)));
+  }
+}
+
+}  // namespace blender::nodes::node_geo_mesh_topology_face_of_corner_cc
+
+void register_node_type_geo_mesh_topology_face_of_corner()
+{
+  namespace file_ns = blender::nodes::node_geo_mesh_topology_face_of_corner_cc;
+
+  static bNodeType ntype;
+  geo_node_type_base(
+      &ntype, GEO_NODE_MESH_TOPOLOGY_FACE_OF_CORNER, "Face of Corner", NODE_CLASS_INPUT);
+  ntype.geometry_node_execute = file_ns::node_geo_exec;
+  ntype.declare = file_ns::node_declare;
+  nodeRegisterType(&ntype);
+}