1 files changed, 128 insertions, 0 deletions
diff --git a/source/blender/nodes/geometry/nodes/node_geo_input_curve_handles.cc b/source/blender/nodes/geometry/nodes/node_geo_input_curve_handles.cc
new file mode 100644
index 00000000000..b1144b58c37
--- /dev/null
+++ b/source/blender/nodes/geometry/nodes/node_geo_input_curve_handles.cc
@@ -0,0 +1,128 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "BKE_spline.hh"
+
+#include "node_geometry_util.hh"
+
+namespace blender::nodes::node_geo_input_curve_handles_cc {
+
+static void node_declare(NodeDeclarationBuilder &b)
+{
+  b.add_input<decl::Bool>(N_("Relative"))
+      .default_value(false)
+      .supports_field()
+      .description(N_("Output the handle positions relative to the corresponding control point "
+                      "instead of in the local space of the geometry"));
+  b.add_output<decl::Vector>(N_("Left")).field_source();
+  b.add_output<decl::Vector>(N_("Right")).field_source();
+}
+
+class HandlePositionFieldInput final : public GeometryFieldInput {
+  Field<bool> relative_;
+  bool left_;
+
+ public:
+  HandlePositionFieldInput(Field<bool> relative, bool left)
+      : GeometryFieldInput(CPPType::get<float3>(), "Handle"), relative_(relative), left_(left)
+  {
+  }
+
+  GVArray get_varray_for_context(const GeometryComponent &component,
+                                 const AttributeDomain domain,
+                                 IndexMask mask) const final
+  {
+    if (component.type() != GEO_COMPONENT_TYPE_CURVE) {
+      return {};
+    }
+
+    GeometryComponentFieldContext field_context{component, ATTR_DOMAIN_POINT};
+    fn::FieldEvaluator evaluator(field_context, &mask);
+    evaluator.add(relative_);
+    evaluator.evaluate();
+    const VArray<bool> &relative = evaluator.get_evaluated<bool>(0);
+
+    VArray<float3> positions = component.attribute_get_for_read<float3>(
+        "position", ATTR_DOMAIN_POINT, {0, 0, 0});
+
+    StringRef side = left_ ? "handle_left" : "handle_right";
+    VArray<float3> handles = component.attribute_get_for_read<float3>(
+        side, ATTR_DOMAIN_POINT, {0, 0, 0});
+
+    if (relative.is_single()) {
+      if (relative.get_internal_single()) {
+        Array<float3> output(positions.size());
+        for (const int i : positions.index_range()) {
+          output[i] = handles[i] - positions[i];
+        }
+        return component.attribute_try_adapt_domain<float3>(
+            VArray<float3>::ForContainer(std::move(output)), ATTR_DOMAIN_POINT, domain);
+      }
+      return component.attribute_try_adapt_domain<float3>(handles, ATTR_DOMAIN_POINT, domain);
+    }
+
+    Array<float3> output(positions.size());
+    for (const int i : positions.index_range()) {
+      if (relative[i]) {
+        output[i] = handles[i] - positions[i];
+      }
+      else {
+        output[i] = handles[i];
+      }
+    }
+    return component.attribute_try_adapt_domain<float3>(
+        VArray<float3>::ForContainer(std::move(output)), ATTR_DOMAIN_POINT, domain);
+  }
+
+  uint64_t hash() const override
+  {
+    return get_default_hash_2(relative_, left_);
+  }
+
+  bool is_equal_to(const fn::FieldNode &other) const override
+  {
+    if (const HandlePositionFieldInput *other_handle =
+            dynamic_cast<const HandlePositionFieldInput *>(&other)) {
+      return relative_ == other_handle->relative_ && left_ == other_handle->left_;
+    }
+    return false;
+  }
+};
+
+static void node_geo_exec(GeoNodeExecParams params)
+{
+  Field<bool> relative = params.extract_input<Field<bool>>("Relative");
+  Field<float3> left_field{std::make_shared<HandlePositionFieldInput>(relative, true)};
+  Field<float3> right_field{std::make_shared<HandlePositionFieldInput>(relative, false)};
+
+  params.set_output("Left", std::move(left_field));
+  params.set_output("Right", std::move(right_field));
+}
+
+}  // namespace blender::nodes::node_geo_input_curve_handles_cc
+
+void register_node_type_geo_input_curve_handles()
+{
+  namespace file_ns = blender::nodes::node_geo_input_curve_handles_cc;
+
+  static bNodeType ntype;
+  geo_node_type_base(
+      &ntype, GEO_NODE_INPUT_CURVE_HANDLES, "Curve Handle Positions", NODE_CLASS_INPUT);
+  node_type_size_preset(&ntype, NODE_SIZE_MIDDLE);
+  ntype.geometry_node_execute = file_ns::node_geo_exec;
+  ntype.declare = file_ns::node_declare;
+  nodeRegisterType(&ntype);
+}