From 295b3aefb0bd884ebec7f838b9dffcbcce3b4eea Mon Sep 17 00:00:00 2001
From: Jacques Lucke <jacques@blender.org>
Date: Fri, 10 Jul 2020 14:19:45 +0200
Subject: Functions: make constant folding work on unfinished networks

---
 .../intern/multi_function_network_optimization.cc         | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

(limited to 'source/blender')

diff --git a/source/blender/functions/intern/multi_function_network_optimization.cc b/source/blender/functions/intern/multi_function_network_optimization.cc
index 55c6b2ec7c3..4fe0b506df8 100644
--- a/source/blender/functions/intern/multi_function_network_optimization.cc
+++ b/source/blender/functions/intern/multi_function_network_optimization.cc
@@ -142,6 +142,19 @@ void dead_node_removal(MFNetwork &network)
  *
  * \{ */
 
+static Vector<MFNode *> find_non_constant_nodes(MFNetwork &network)
+{
+  Vector<MFNode *> non_constant_nodes;
+  non_constant_nodes.extend(network.dummy_nodes());
+
+  for (MFFunctionNode *node : network.function_nodes()) {
+    if (!node->all_inputs_have_origin()) {
+      non_constant_nodes.append(node);
+    }
+  }
+  return non_constant_nodes;
+}
+
 static bool output_has_non_constant_target_node(MFOutputSocket *output_socket,
                                                 Span<bool> is_not_constant_mask)
 {
@@ -168,7 +181,7 @@ static MFInputSocket *try_find_dummy_target_socket(MFOutputSocket *output_socket
 static Vector<MFInputSocket *> find_constant_inputs_to_fold(
     MFNetwork &network, Vector<MFDummyNode *> &r_temporary_nodes)
 {
-  Span<MFNode *> non_constant_nodes = network.dummy_nodes();
+  Vector<MFNode *> non_constant_nodes = find_non_constant_nodes(network);
   Array<bool> is_not_constant_mask = mask_nodes_to_the_right(network, non_constant_nodes);
   Vector<MFNode *> constant_nodes = find_nodes_based_on_mask(network, is_not_constant_mask, false);
 
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