1 files changed, 44 insertions, 0 deletions
diff --git a/source/blender/functions/intern/multi_function_params.cc b/source/blender/functions/intern/multi_function_params.cc
new file mode 100644
index 00000000000..376c5b2deb7
--- /dev/null
+++ b/source/blender/functions/intern/multi_function_params.cc
@@ -0,0 +1,44 @@
+/*
+ * 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 "FN_multi_function_params.hh"
+
+namespace blender::fn {
+
+GMutableSpan MFParams::ensure_dummy_single_output(int data_index)
+{
+  /* Lock because we are actually modifying #builder_ and it may be used by multiple threads. */
+  std::lock_guard lock{builder_->mutex_};
+
+  for (const std::pair<int, GMutableSpan> &items : builder_->dummy_output_spans_) {
+    if (items.first == data_index) {
+      return items.second;
+    }
+  }
+
+  const CPPType &type = builder_->mutable_spans_[data_index].type();
+  void *buffer = builder_->scope_.linear_allocator().allocate(
+      builder_->min_array_size_ * type.size(), type.alignment());
+  if (!type.is_trivially_destructible()) {
+    builder_->scope_.add_destruct_call(
+        [&type, buffer, mask = builder_->mask_]() { type.destruct_indices(buffer, mask); });
+  }
+  const GMutableSpan span{type, buffer, builder_->min_array_size_};
+  builder_->dummy_output_spans_.append({data_index, span});
+  return span;
+}
+
+}  // namespace blender::fn