diff options
Diffstat (limited to 'source/blender/nodes/geometry/nodes/node_geo_mesh_topology_corners_of_vertex.cc')
| -rw-r--r-- | source/blender/nodes/geometry/nodes/node_geo_mesh_topology_corners_of_vertex.cc | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/source/blender/nodes/geometry/nodes/node_geo_mesh_topology_corners_of_vertex.cc b/source/blender/nodes/geometry/nodes/node_geo_mesh_topology_corners_of_vertex.cc new file mode 100644 index 00000000000..036af2d3b93 --- /dev/null +++ b/source/blender/nodes/geometry/nodes/node_geo_mesh_topology_corners_of_vertex.cc @@ -0,0 +1,209 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#include "BKE_mesh.h" +#include "BKE_mesh_mapping.h" + +#include "BLI_task.hh" + +#include "node_geometry_util.hh" + +namespace blender::nodes::node_geo_mesh_topology_corners_of_vertex_cc { + +static void node_declare(NodeDeclarationBuilder &b) +{ + b.add_input<decl::Int>(N_("Vertex Index")) + .implicit_field(implicit_field_inputs::index) + .description( + N_("The vertex to retrieve data from. Defaults to the vertex from the context")); + b.add_input<decl::Float>(N_("Weights")) + .supports_field() + .hide_value() + .description( + N_("Values used to sort corners attached to the vertex. 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 connected to the face, chosen by the sort index")); + b.add_output<decl::Int>(N_("Total")) + .dependent_field() + .description(N_("The number of faces or corners connected to each vertex")); +} + +static void convert_span(const Span<int> src, MutableSpan<int64_t> dst) +{ + for (const int i : src.index_range()) { + dst[i] = src[i]; + } +} + +class CornersOfVertInput final : public bke::MeshFieldInput { + const Field<int> vert_index_; + const Field<int> sort_index_; + const Field<float> sort_weight_; + + public: + CornersOfVertInput(Field<int> vert_index, Field<int> sort_index, Field<float> sort_weight) + : bke::MeshFieldInput(CPPType::get<int>(), "Corner of Vertex"), + vert_index_(std::move(vert_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 IndexRange vert_range(mesh.totvert); + const Span<MLoop> loops = mesh.loops(); + Array<Vector<int>> vert_to_loop_map = bke::mesh_topology::build_vert_to_loop_map(loops, + mesh.totvert); + + const bke::MeshFieldContext context{mesh, domain}; + fn::FieldEvaluator evaluator{context, &mask}; + evaluator.add(vert_index_); + evaluator.add(sort_index_); + evaluator.evaluate(); + const VArray<int> vert_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, loops.size()}; + corner_evaluator.add(sort_weight_); + corner_evaluator.evaluate(); + const VArray<float> all_sort_weights = corner_evaluator.get_evaluated<float>(0); + + Array<int> corner_of_vertex(mask.min_array_size()); + threading::parallel_for(mask.index_range(), 1024, [&](const IndexRange range) { + /* Reuse arrays to avoid allocation. */ + Array<int64_t> corner_indices; + Array<float> sort_weights; + Array<int> sort_indices; + + for (const int selection_i : mask.slice(range)) { + const int vert_i = vert_indices[selection_i]; + const int index_in_sort = indices_in_sort[selection_i]; + if (!vert_range.contains(vert_i)) { + corner_of_vertex[selection_i] = 0; + continue; + } + + const Span<int> corners = vert_to_loop_map[vert_i]; + if (corners.is_empty()) { + corner_of_vertex[selection_i] = 0; + continue; + } + + /* Retrieve the connected edge indices as 64 bit integers for #materialize_compressed. */ + corner_indices.reinitialize(corners.size()); + convert_span(corners, corner_indices); + + /* Retrieve a compressed array of weights for each edge. */ + sort_weights.reinitialize(corners.size()); + all_sort_weights.materialize_compressed(IndexMask(corner_indices), + 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_vertex[selection_i] = corner_indices[sort_indices[index_in_sort_wrapped]]; + } + }); + + return VArray<int>::ForContainer(std::move(corner_of_vertex)); + } + + uint64_t hash() const final + { + return 3541871368173645; + } + + bool is_equal_to(const fn::FieldNode &other) const final + { + if (const auto *typed = dynamic_cast<const CornersOfVertInput *>(&other)) { + return typed->vert_index_ == vert_index_ && typed->sort_index_ == sort_index_ && + typed->sort_weight_ == sort_weight_; + } + return false; + } +}; + +class CornersOfVertCountInput final : public bke::MeshFieldInput { + public: + CornersOfVertCountInput() : bke::MeshFieldInput(CPPType::get<int>(), "Vertex 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_POINT) { + return {}; + } + const Span<MLoop> loops = mesh.loops(); + Array<int> counts(mesh.totvert, 0); + for (const int i : loops.index_range()) { + counts[loops[i].v]++; + } + return VArray<int>::ForContainer(std::move(counts)); + } + + uint64_t hash() const final + { + return 253098745374645; + } + + bool is_equal_to(const fn::FieldNode &other) const final + { + if (dynamic_cast<const CornersOfVertCountInput *>(&other)) { + return true; + } + return false; + } +}; + +static void node_geo_exec(GeoNodeExecParams params) +{ + const Field<int> vert_index = params.extract_input<Field<int>>("Vertex Index"); + if (params.output_is_required("Total")) { + params.set_output("Total", + Field<int>(std::make_shared<FieldAtIndexInput>( + vert_index, + Field<int>(std::make_shared<CornersOfVertCountInput>()), + ATTR_DOMAIN_POINT))); + } + if (params.output_is_required("Corner Index")) { + params.set_output("Corner Index", + Field<int>(std::make_shared<CornersOfVertInput>( + vert_index, + params.extract_input<Field<int>>("Sort Index"), + params.extract_input<Field<float>>("Weights")))); + } +} +} // namespace blender::nodes::node_geo_mesh_topology_corners_of_vertex_cc + +void register_node_type_geo_mesh_topology_corners_of_vertex() +{ + namespace file_ns = blender::nodes::node_geo_mesh_topology_corners_of_vertex_cc; + + static bNodeType ntype; + geo_node_type_base( + &ntype, GEO_NODE_MESH_TOPOLOGY_CORNERS_OF_VERTEX, "Corners of Vertex", NODE_CLASS_INPUT); + ntype.geometry_node_execute = file_ns::node_geo_exec; + ntype.declare = file_ns::node_declare; + nodeRegisterType(&ntype); +} |