Geometry Nodes: Port sample curves node to new data-block

Use the newer more generic sampling and interpolation functions
developed recently (ab444a80a280) instead of the `CurveEval` type.
Functions are split up a bit more internally, to allow a separate mode
for supplying the curve index directly in the future (T92474).

In one basic test, the performance seems mostly unchanged from 3.1.

Differential Revision: https://developer.blender.org/D14621

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/functions/FN_field.hh b/source/blender/functions/FN_field.hh
index a8136d06c5f..bc42cab8db5 100644
--- a/source/blender/functions/FN_field.hh
+++ b/source/blender/functions/FN_field.hh
@@ -221,6 +221,17 @@ class FieldOperation : public FieldNode {
   const MultiFunction &multi_function() const;
 
   const CPPType &output_cpp_type(int output_index) const override;
+
+  static std::shared_ptr<FieldOperation> Create(std::shared_ptr<const MultiFunction> function,
+                                                Vector<GField> inputs = {})
+  {
+    return std::make_shared<FieldOperation>(FieldOperation(std::move(function), inputs));
+  }
+  static std::shared_ptr<FieldOperation> Create(const MultiFunction &function,
+                                                Vector<GField> inputs = {})
+  {
+    return std::make_shared<FieldOperation>(FieldOperation(function, inputs));
+  }
 };
 
 class FieldContext;