node_geo_uv_pack_islands.cc

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "GEO_uv_parametrizer.hh"
 
#include "BKE_mesh.hh"
 
#include "node_geometry_util.hh"
 
namespace blender::nodes::node_geo_uv_pack_islands_cc {
 
static void node_declare(NodeDeclarationBuilder &b)
{
  b.add_input<decl::Vector>("UV").hide_value().supports_field();
  b.add_input<decl::Bool>("Selection")
      .default_value(true)
      .hide_value()
      .supports_field()
      .description("Faces to consider when packing islands");
  b.add_input<decl::Float>("Margin").default_value(0.001f).min(0.0f).max(1.0f).description(
      "Space between islands");
  b.add_input<decl::Bool>("Rotate").default_value(true).description("Rotate islands for best fit");
  b.add_output<decl::Vector>("UV").field_source_reference_all();
}
 
static VArray<float3> construct_uv_gvarray(const Mesh &mesh,
                                           const Field<bool> selection_field,
                                           const Field<float3> uv_field,
                                           const bool rotate,
                                           const float margin,
                                           const AttrDomain domain)
{
  const Span<float3> positions = mesh.vert_positions();
  const OffsetIndices faces = mesh.faces();
  const Span<int> corner_verts = mesh.corner_verts();
 
  const bke::MeshFieldContext face_context{mesh, AttrDomain::Face};
  FieldEvaluator face_evaluator{face_context, faces.size()};
  face_evaluator.add(selection_field);
  face_evaluator.evaluate();
  const IndexMask selection = face_evaluator.get_evaluated_as_mask(0);
  if (selection.is_empty()) {
    return {};
  }
 
  const bke::MeshFieldContext corner_context{mesh, AttrDomain::Corner};
  FieldEvaluator evaluator{corner_context, mesh.corners_num};
  Array<float3> uv(mesh.corners_num);
  evaluator.add_with_destination(uv_field, uv.as_mutable_span());
  evaluator.evaluate();
 
  geometry::ParamHandle *handle = new geometry::ParamHandle();
  selection.foreach_index([&](const int face_index) {
    const IndexRange face = faces[face_index];
    Array<geometry::ParamKey, 16> mp_vkeys(face.size());
    Array<bool, 16> mp_pin(face.size());
    Array<bool, 16> mp_select(face.size());
    Array<const float *, 16> mp_co(face.size());
    Array<float *, 16> mp_uv(face.size());
    for (const int i : IndexRange(face.size())) {
      const int corner = face[i];
      const int vert = corner_verts[corner];
      mp_vkeys[i] = vert;
      mp_co[i] = positions[vert];
      mp_uv[i] = uv[corner];
      mp_pin[i] = false;
      mp_select[i] = false;
    }
    geometry::uv_parametrizer_face_add(handle,
                                       face_index,
                                       face.size(),
                                       mp_vkeys.data(),
                                       mp_co.data(),
                                       mp_uv.data(),
                                       nullptr,
                                       mp_pin.data(),
                                       mp_select.data());
  });
  geometry::uv_parametrizer_construct_end(handle, true, true, nullptr);
 
  geometry::uv_parametrizer_pack(handle, margin, rotate, true);
  geometry::uv_parametrizer_flush(handle);
  delete (handle);
 
  return mesh.attributes().adapt_domain<float3>(
      VArray<float3>::ForContainer(std::move(uv)), AttrDomain::Corner, domain);
}
 
class PackIslandsFieldInput final : public bke::MeshFieldInput {
 private:
  const Field<bool> selection_field_;
  const Field<float3> uv_field_;
  const bool rotate_;
  const float margin_;
 
 public:
  PackIslandsFieldInput(const Field<bool> selection_field,
                        const Field<float3> uv_field,
                        const bool rotate,
                        const float margin)
      : bke::MeshFieldInput(CPPType::get<float3>(), "Pack UV Islands Field"),
        selection_field_(selection_field),
        uv_field_(uv_field),
        rotate_(rotate),
        margin_(margin)
  {
    category_ = Category::Generated;
  }
 
  GVArray get_varray_for_context(const Mesh &mesh,
                                 const AttrDomain domain,
                                 const IndexMask & /*mask*/) const final
  {
    return construct_uv_gvarray(mesh, selection_field_, uv_field_, rotate_, margin_, domain);
  }
 
  void for_each_field_input_recursive(FunctionRef<void(const FieldInput &)> fn) const override
  {
    selection_field_.node().for_each_field_input_recursive(fn);
    uv_field_.node().for_each_field_input_recursive(fn);
  }
 
  std::optional<AttrDomain> preferred_domain(const Mesh & /*mesh*/) const override
  {
    return AttrDomain::Corner;
  }
};
 
static void node_geo_exec(GeoNodeExecParams params)
{
  const Field<bool> selection_field = params.extract_input<Field<bool>>("Selection");
  const Field<float3> uv_field = params.extract_input<Field<float3>>("UV");
  const bool rotate = params.extract_input<bool>("Rotate");
  const float margin = params.extract_input<float>("Margin");
  params.set_output("UV",
                    Field<float3>(std::make_shared<PackIslandsFieldInput>(
                        selection_field, uv_field, rotate, margin)));
}
 
static void node_register()
{
  static blender::bke::bNodeType ntype;
 
  geo_node_type_base(&ntype, GEO_NODE_UV_PACK_ISLANDS, "Pack UV Islands", NODE_CLASS_CONVERTER);
  ntype.declare = node_declare;
  ntype.geometry_node_execute = node_geo_exec;
  blender::bke::node_register_type(&ntype);
}
NOD_REGISTER_NODE(node_register)
 
}  // namespace blender::nodes::node_geo_uv_pack_islands_cc