1 files changed, 152 insertions, 0 deletions
diff --git a/source/blender/nodes/geometry/nodes/node_geo_uv_pack_islands.cc b/source/blender/nodes/geometry/nodes/node_geo_uv_pack_islands.cc
new file mode 100644
index 00000000000..17413e64f7d
--- /dev/null
+++ b/source/blender/nodes/geometry/nodes/node_geo_uv_pack_islands.cc
@@ -0,0 +1,152 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include "GEO_uv_parametrizer.h"
+
+#include "DNA_mesh_types.h"
+#include "DNA_meshdata_types.h"
+
+#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>(N_("UV")).hide_value().supports_field();
+  b.add_input<decl::Bool>(N_("Selection"))
+      .default_value(true)
+      .hide_value()
+      .supports_field()
+      .description(N_("Faces to consider when packing islands"));
+  b.add_input<decl::Float>(N_("Margin"))
+      .default_value(0.001f)
+      .min(0.0f)
+      .max(1.0f)
+      .description(N_("Space between islands"));
+  b.add_input<decl::Bool>(N_("Rotate"))
+      .default_value(true)
+      .description(N_("Rotate islands for best fit"));
+  b.add_output<decl::Vector>(N_("UV")).field_source();
+}
+
+static VArray<float3> construct_uv_gvarray(const MeshComponent &component,
+                                           const Field<bool> selection_field,
+                                           const Field<float3> uv_field,
+                                           const bool rotate,
+                                           const float margin,
+                                           const eAttrDomain domain)
+{
+  const Mesh *mesh = component.get_for_read();
+  if (mesh == nullptr) {
+    return {};
+  }
+
+  const int face_num = component.attribute_domain_size(ATTR_DOMAIN_FACE);
+  GeometryComponentFieldContext face_context{component, ATTR_DOMAIN_FACE};
+  FieldEvaluator face_evaluator{face_context, face_num};
+  face_evaluator.add(selection_field);
+  face_evaluator.evaluate();
+  const IndexMask selection = face_evaluator.get_evaluated_as_mask(0);
+  if (selection.is_empty()) {
+    return {};
+  }
+
+  const int corner_num = component.attribute_domain_size(ATTR_DOMAIN_CORNER);
+  GeometryComponentFieldContext corner_context{component, ATTR_DOMAIN_CORNER};
+  FieldEvaluator evaluator{corner_context, corner_num};
+  Array<float3> uv(corner_num);
+  evaluator.add_with_destination(uv_field, uv.as_mutable_span());
+  evaluator.evaluate();
+
+  ParamHandle *handle = GEO_uv_parametrizer_construct_begin();
+  for (const int mp_index : selection) {
+    const MPoly &mp = mesh->mpoly[mp_index];
+    Array<ParamKey, 16> mp_vkeys(mp.totloop);
+    Array<bool, 16> mp_pin(mp.totloop);
+    Array<bool, 16> mp_select(mp.totloop);
+    Array<const float *, 16> mp_co(mp.totloop);
+    Array<float *, 16> mp_uv(mp.totloop);
+    for (const int i : IndexRange(mp.totloop)) {
+      const MLoop &ml = mesh->mloop[mp.loopstart + i];
+      mp_vkeys[i] = ml.v;
+      mp_co[i] = mesh->mvert[ml.v].co;
+      mp_uv[i] = uv[mp.loopstart + i];
+      mp_pin[i] = false;
+      mp_select[i] = false;
+    }
+    GEO_uv_parametrizer_face_add(handle,
+                                 mp_index,
+                                 mp.totloop,
+                                 mp_vkeys.data(),
+                                 mp_co.data(),
+                                 mp_uv.data(),
+                                 mp_pin.data(),
+                                 mp_select.data());
+  }
+  GEO_uv_parametrizer_construct_end(handle, true, true, nullptr);
+
+  GEO_uv_parametrizer_pack(handle, margin, rotate, true);
+  GEO_uv_parametrizer_flush(handle);
+  GEO_uv_parametrizer_delete(handle);
+
+  return component.attributes()->adapt_domain<float3>(
+      VArray<float3>::ForContainer(std::move(uv)), ATTR_DOMAIN_CORNER, domain);
+}
+
+class PackIslandsFieldInput final : public GeometryFieldInput {
+ 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)
+      : GeometryFieldInput(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 GeometryComponent &component,
+                                 const eAttrDomain domain,
+                                 IndexMask UNUSED(mask)) const final
+  {
+    if (component.type() == GEO_COMPONENT_TYPE_MESH) {
+      const MeshComponent &mesh_component = static_cast<const MeshComponent &>(component);
+      return construct_uv_gvarray(
+          mesh_component, selection_field, uv_field, rotate, margin, domain);
+    }
+    return {};
+  }
+};
+
+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)));
+}
+
+}  // namespace blender::nodes::node_geo_uv_pack_islands_cc
+
+void register_node_type_geo_uv_pack_islands()
+{
+  namespace file_ns = blender::nodes::node_geo_uv_pack_islands_cc;
+
+  static bNodeType ntype;
+
+  geo_node_type_base(&ntype, GEO_NODE_UV_PACK_ISLANDS, "Pack UV Islands", NODE_CLASS_CONVERTER);
+  ntype.declare = file_ns::node_declare;
+  ntype.geometry_node_execute = file_ns::node_geo_exec;
+  nodeRegisterType(&ntype);
+}