Little fix: don't create an empty undo/redo command when trying to add a second Input GraphNode

2 files changed, 11 insertions, 0 deletions

diff --git a/scene/resources/shader_graph.cpp b/scene/resources/shader_graph.cpp
index 108aad3c56..9522667698 100644
--- a/scene/resources/shader_graph.cpp
+++ b/scene/resources/shader_graph.cpp
@@ -142,6 +142,15 @@ ShaderGraph::GraphError ShaderGraph::get_graph_error(ShaderType p_type) const {
 	return shader[p_type].error;
 }
 
+int ShaderGraph::node_count(ShaderType p_which, int p_type)
+{
+	int count=0;
+	for (Map<int,Node>::Element *E=shader[p_which].node_map.front();E;E=E->next())
+		if (E->get().type==p_type)
+			count++;
+	return count;
+}
+
 void ShaderGraph::_bind_methods() {
 
 	ObjectTypeDB::bind_method(_MD("_update_shader"),&ShaderGraph::_update_shader);
diff --git a/scene/resources/shader_graph.h b/scene/resources/shader_graph.h
index d3a297cd6c..b93567538d 100644
--- a/scene/resources/shader_graph.h
+++ b/scene/resources/shader_graph.h
@@ -365,6 +365,8 @@ public:
 
 	GraphError get_graph_error(ShaderType p_type) const;
 
+	int node_count(ShaderType p_which, int p_type);
+
 	static int get_type_input_count(NodeType p_type);
 	static int get_type_output_count(NodeType p_type);
 	static SlotType get_type_input_type(NodeType p_type,int p_idx);