diff options
Diffstat (limited to 'source/blender/nodes/geometry/nodes/node_geo_mesh_topology_corners_of_face.cc')
| -rw-r--r-- | source/blender/nodes/geometry/nodes/node_geo_mesh_topology_corners_of_face.cc | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/source/blender/nodes/geometry/nodes/node_geo_mesh_topology_corners_of_face.cc b/source/blender/nodes/geometry/nodes/node_geo_mesh_topology_corners_of_face.cc new file mode 100644 index 00000000000..94bca02640b --- /dev/null +++ b/source/blender/nodes/geometry/nodes/node_geo_mesh_topology_corners_of_face.cc @@ -0,0 +1,189 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#include "BLI_task.hh" + +#include "BKE_mesh.h" + +#include "node_geometry_util.hh" + +namespace blender::nodes::node_geo_mesh_topology_corners_of_face_cc { + +static void node_declare(NodeDeclarationBuilder &b) +{ + b.add_input<decl::Int>(N_("Face Index")) + .implicit_field(implicit_field_inputs::index) + .description(N_("The face to retrieve data from. Defaults to the face from the context")); + b.add_input<decl::Float>(N_("Weights")) + .supports_field() + .hide_value() + .description(N_("Values used to sort the face's corners. Uses indices by default")); + b.add_input<decl::Int>(N_("Sort Index")) + .min(0) + .supports_field() + .description(N_("Which of the sorted corners to output")); + b.add_output<decl::Int>(N_("Corner Index")) + .dependent_field() + .description(N_("A corner of the face, chosen by the sort index")); + b.add_output<decl::Int>(N_("Total")) + .dependent_field() + .description(N_("The number of corners in the face")); +} + +class CornersOfFaceInput final : public bke::MeshFieldInput { + const Field<int> face_index_; + const Field<int> sort_index_; + const Field<float> sort_weight_; + + public: + CornersOfFaceInput(Field<int> face_index, Field<int> sort_index, Field<float> sort_weight) + : bke::MeshFieldInput(CPPType::get<int>(), "Corner of Face"), + face_index_(std::move(face_index)), + sort_index_(std::move(sort_index)), + sort_weight_(std::move(sort_weight)) + { + category_ = Category::Generated; + } + + GVArray get_varray_for_context(const Mesh &mesh, + const eAttrDomain domain, + const IndexMask mask) const final + { + const Span<MPoly> polys = mesh.polys(); + + const bke::MeshFieldContext context{mesh, domain}; + fn::FieldEvaluator evaluator{context, &mask}; + evaluator.add(face_index_); + evaluator.add(sort_index_); + evaluator.evaluate(); + const VArray<int> face_indices = evaluator.get_evaluated<int>(0); + const VArray<int> indices_in_sort = evaluator.get_evaluated<int>(1); + + const bke::MeshFieldContext corner_context{mesh, ATTR_DOMAIN_CORNER}; + fn::FieldEvaluator corner_evaluator{corner_context, mesh.totloop}; + corner_evaluator.add(sort_weight_); + corner_evaluator.evaluate(); + const VArray<float> all_sort_weights = corner_evaluator.get_evaluated<float>(0); + + Array<int> corner_of_face(mask.min_array_size()); + threading::parallel_for(mask.index_range(), 1024, [&](const IndexRange range) { + /* Reuse arrays to avoid allocation. */ + Array<float> sort_weights; + Array<int> sort_indices; + + for (const int selection_i : mask.slice(range)) { + const int poly_i = face_indices[selection_i]; + const int index_in_sort = indices_in_sort[selection_i]; + if (!polys.index_range().contains(poly_i)) { + corner_of_face[selection_i] = 0; + continue; + } + + const MPoly &poly = polys[poly_i]; + const IndexRange corners(poly.loopstart, poly.totloop); + + /* Retrieve the weights for each corner. */ + sort_weights.reinitialize(corners.size()); + all_sort_weights.materialize_compressed(IndexMask(corners), + sort_weights.as_mutable_span()); + + /* Sort a separate array of compressed indices corresponding to the compressed weights. + * This allows using `materialize_compressed` to avoid virtual function call overhead + * when accessing values in the sort weights. However, it means a separate array of + * indices within the compressed array is necessary for sorting. */ + sort_indices.reinitialize(corners.size()); + std::iota(sort_indices.begin(), sort_indices.end(), 0); + std::stable_sort(sort_indices.begin(), sort_indices.end(), [&](int a, int b) { + return sort_weights[a] < sort_weights[b]; + }); + + const int index_in_sort_wrapped = mod_i(index_in_sort, corners.size()); + corner_of_face[selection_i] = corners[sort_indices[index_in_sort_wrapped]]; + } + }); + + return VArray<int>::ForContainer(std::move(corner_of_face)); + } + + uint64_t hash() const final + { + return 6927982716657; + } + + bool is_equal_to(const fn::FieldNode &other) const final + { + if (const auto *typed = dynamic_cast<const CornersOfFaceInput *>(&other)) { + return typed->face_index_ == face_index_ && typed->sort_index_ == sort_index_ && + typed->sort_weight_ == sort_weight_; + } + return false; + } +}; + +static int get_poly_totloop(const MPoly &poly) +{ + return poly.totloop; +} + +class CornersOfFaceCountInput final : public bke::MeshFieldInput { + public: + CornersOfFaceCountInput() : bke::MeshFieldInput(CPPType::get<int>(), "Face Corner Count") + { + category_ = Category::Generated; + } + + GVArray get_varray_for_context(const Mesh &mesh, + const eAttrDomain domain, + const IndexMask /*mask*/) const final + { + if (domain != ATTR_DOMAIN_FACE) { + return {}; + } + return VArray<int>::ForDerivedSpan<MPoly, get_poly_totloop>(mesh.polys()); + } + + uint64_t hash() const final + { + return 8345908765432698; + } + + bool is_equal_to(const fn::FieldNode &other) const final + { + if (dynamic_cast<const CornersOfFaceCountInput *>(&other)) { + return true; + } + return false; + } +}; + +static void node_geo_exec(GeoNodeExecParams params) +{ + const Field<int> face_index = params.extract_input<Field<int>>("Face Index"); + if (params.output_is_required("Total")) { + params.set_output("Total", + Field<int>(std::make_shared<FieldAtIndexInput>( + face_index, + Field<int>(std::make_shared<CornersOfFaceCountInput>()), + ATTR_DOMAIN_FACE))); + } + if (params.output_is_required("Corner Index")) { + params.set_output("Corner Index", + Field<int>(std::make_shared<CornersOfFaceInput>( + face_index, + params.extract_input<Field<int>>("Sort Index"), + params.extract_input<Field<float>>("Weights")))); + } +} + +} // namespace blender::nodes::node_geo_mesh_topology_corners_of_face_cc + +void register_node_type_geo_mesh_topology_corners_of_face() +{ + namespace file_ns = blender::nodes::node_geo_mesh_topology_corners_of_face_cc; + + static bNodeType ntype; + geo_node_type_base( + &ntype, GEO_NODE_MESH_TOPOLOGY_CORNERS_OF_FACE, "Corners of Face", NODE_CLASS_INPUT); + ntype.geometry_node_execute = file_ns::node_geo_exec; + ntype.declare = file_ns::node_declare; + nodeRegisterType(&ntype); +} |