Give access to node inputs in runtime graph, initial works for marking of active nodes.

src/AnimGraphEditor.cc

@@ -7,6 +7,8 @@
 #include "AnimGraphResource.h"
 #include "imnodes.h"
 
+using namespace AnimGraphCode;
+
 ImNodesPinShape sGetSocketShapeFromSocketType(const SocketType& socket_type) {
   switch (socket_type) {
     case SocketType::SocketTypeAnimation:
@@ -26,6 +28,52 @@ ImNodesPinShape sGetSocketShapeFromSocketType(const SocketType& socket_type) {
   return ImNodesPinShape_Quad;
 }
 
+void AnimGraphEditorRenderSidebar(AnimNodeResource& node_resource) {
+  ImGui::Text("[%s]", node_resource.m_type_name.c_str());
+
+  char node_name_buffer[256];
+  memset(node_name_buffer, 0, sizeof(node_name_buffer));
+  strncpy(
+      node_name_buffer,
+      node_resource.m_name.c_str(),
+      std::min(node_resource.m_name.size(), sizeof(node_name_buffer)));
+
+  if (ImGui::InputText("Name", node_name_buffer, sizeof(node_name_buffer))) {
+    node_resource.m_name = node_name_buffer;
+  }
+
+  int num_properties = node_resource.m_socket_accessor->m_properties.size();
+  for (int i = 0; i < num_properties; i++) {
+    Socket& property = node_resource.m_socket_accessor->m_properties[i];
+    if (property.m_type == SocketType::SocketTypeFloat) {
+      ImGui::SliderFloat(
+          property.m_name.c_str(),
+          reinterpret_cast<float*>(property.m_value.ptr),
+          -100.f,
+          100.f);
+    } else if (property.m_type == SocketType::SocketTypeBool) {
+      ImGui::Checkbox(
+          property.m_name.c_str(),
+          reinterpret_cast<bool*>(property.m_value.ptr));
+    } else if (property.m_type == SocketType::SocketTypeString) {
+      std::string* property_string =
+          reinterpret_cast<std::string*>(property.m_value.ptr);
+      char string_buf[256];
+      memset(string_buf, 0, sizeof(string_buf));
+      strncpy(
+          string_buf,
+          property_string->c_str(),
+          std::min(property_string->size(), sizeof(string_buf)));
+      if (ImGui::InputText(
+              property.m_name.c_str(),
+              string_buf,
+              sizeof(string_buf))) {
+        (*property_string) = string_buf;
+      }
+    }
+  }
+}
+
 void AnimGraphEditorUpdate() {
   static AnimGraphResource graph_resource = AnimGraphResource();
 
@@ -58,6 +106,11 @@ void AnimGraphEditorUpdate() {
 
   ImGui::EndMenuBar();
 
+  ImGui::Columns(2);
+
+  //
+  // Node editor canvas
+  //
   ImNodes::BeginNodeEditor();
 
   // Popup menu
@@ -122,13 +175,20 @@ void AnimGraphEditorUpdate() {
         node_resource.m_socket_accessor->m_inputs;
     for (size_t j = 0, ni = node_inputs.size(); j < ni; j++) {
       const Socket& socket = node_inputs[j];
+
+      ImColor socket_color = ImColor(255, 255, 255, 255);
+      if (socket.m_flags & SocketFlagAffectsTime) {
+        socket_color = ImColor(255, 128, 128, 255);
+      }
+
       ImNodes::BeginInputAttribute(
           GenerateInputAttributeId(i, j),
           sGetSocketShapeFromSocketType(socket.m_type),
-          ImColor(255, 255, 255, 255));
+          socket_color);
       ImGui::Text(socket.m_name.c_str());
 
-      ImNodes::PushAttributeFlag(ImNodesAttributeFlags_EnableLinkDetachWithDragClick);
+      ImNodes::PushAttributeFlag(
+          ImNodesAttributeFlags_EnableLinkDetachWithDragClick);
       ImNodes::EndInputAttribute();
     }
 
@@ -142,19 +202,21 @@ void AnimGraphEditorUpdate() {
           sGetSocketShapeFromSocketType(socket.m_type),
           ImColor(255, 255, 255, 255));
       ImGui::Text(socket.m_name.c_str());
-      ImNodes::PushAttributeFlag(ImNodesAttributeFlags_EnableLinkDetachWithDragClick);
+      ImNodes::PushAttributeFlag(
+          ImNodesAttributeFlags_EnableLinkDetachWithDragClick);
       ImNodes::EndInputAttribute();
     }
 
     // Graph output node
     if (i == 0) {
       if (ImGui::Button("+Output")) {
-        AnimNodeResource& graph_output_node = graph_resource.getGraphOutputNode();
+        AnimNodeResource& graph_output_node =
+            graph_resource.getGraphOutputNode();
 
         static float bla = 0.f;
         std::string socket_name = "Output";
-        socket_name +=
-            std::to_string(graph_output_node.m_socket_accessor->m_inputs.size());
+        socket_name += std::to_string(
+            graph_output_node.m_socket_accessor->m_inputs.size());
         graph_output_node.m_socket_accessor->RegisterInput<float>(
             socket_name,
             nullptr);
@@ -165,8 +227,8 @@ void AnimGraphEditorUpdate() {
 
         static float bla = 0.f;
         std::string socket_name = "Input";
-        socket_name +=
-            std::to_string(graph_input_node.m_socket_accessor->m_outputs.size());
+        socket_name += std::to_string(
+            graph_input_node.m_socket_accessor->m_outputs.size());
         graph_input_node.m_socket_accessor->RegisterOutput<float>(
             socket_name,
             nullptr);
@@ -178,6 +240,9 @@ void AnimGraphEditorUpdate() {
     node_resource.m_position[0] = node_pos[0];
     node_resource.m_position[1] = node_pos[1];
     ImNodes::EndNode();
+
+    // Ensure flags such as SocketFlagAffectsTime are properly set.
+    node_resource.m_socket_accessor->UpdateFlags();
   }
 
   for (size_t i = 0, n = graph_resource.m_connections.size(); i < n; i++) {
@@ -220,6 +285,25 @@ void AnimGraphEditorUpdate() {
   // Handle link detachements.
   int link_id = 0;
   if (ImNodes::IsLinkDestroyed(&link_id)) {
-    graph_resource.m_connections.erase(graph_resource.m_connections.begin() + link_id);
+    graph_resource.m_connections.erase(
+        graph_resource.m_connections.begin() + link_id);
   }
+
+  int selected_nodes[ImNodes::NumSelectedNodes()];
+  ImNodes::GetSelectedNodes(selected_nodes);
+
+  //
+  // Sidebar
+  //
+  ImGui::NextColumn();
+
+  if (ImNodes::NumSelectedNodes() == 1) {
+    if (selected_nodes[0] < graph_resource.m_nodes.size()) {
+      AnimNodeResource& selected_node =
+          graph_resource.m_nodes[selected_nodes[0]];
+      AnimGraphEditorRenderSidebar(selected_node);
+    }
+  }
+
+  ImGui::Columns(1);
 }

src/AnimGraphResource.cc

@@ -8,6 +8,8 @@
 
 #include "3rdparty/json/json.hpp"
 
+namespace AnimGraphCode {
+
 using json = nlohmann::json;
 
 //
@@ -45,6 +47,31 @@ json sSocketToJson(const Socket& socket) {
   json result;
   result["name"] = socket.m_name;
   result["type"] = sSocketTypeToStr(socket.m_type);
+
+  if (socket.m_value.ptr != nullptr) {
+    if (socket.m_type == SocketType::SocketTypeBool) {
+      result["value"] = *reinterpret_cast<bool*>(socket.m_value.ptr);
+    } else if (socket.m_type == SocketType::SocketTypeAnimation) {
+    } else if (socket.m_type == SocketType::SocketTypeFloat) {
+      result["value"] = *reinterpret_cast<float*>(socket.m_value.ptr);
+    } else if (socket.m_type == SocketType::SocketTypeVec3) {
+      Vec3& vec3 = *reinterpret_cast<Vec3*>(socket.m_value.ptr);
+      result["value"][0] = vec3[0];
+      result["value"][1] = vec3[1];
+      result["value"][2] = vec3[2];
+    } else if (socket.m_type == SocketType::SocketTypeQuat) {
+      Quat& quat = *reinterpret_cast<Quat*>(socket.m_value.ptr);
+      result["value"][0] = quat[0];
+      result["value"][1] = quat[1];
+      result["value"][2] = quat[2];
+      result["value"][3] = quat[3];
+    } else if (socket.m_type == SocketType::SocketTypeString) {
+      result["value"] = *reinterpret_cast<std::string*>(socket.m_value.ptr);
+    } else {
+      std::cerr << "Invalid socket type '" << static_cast<int>(socket.m_type)
+                << "'." << std::endl;
+    }
+  }
   return result;
 }
 
@@ -95,6 +122,12 @@ json sAnimGraphNodeToJson(const AnimNodeResource& node) {
     result["position"][j] = node.m_position[j];
   }
 
+  for (size_t j = 0, n = node.m_socket_accessor->m_properties.size(); j < n;
+       j++) {
+    Socket& property = node.m_socket_accessor->m_properties[j];
+    result["properties"][property.m_name] = sSocketToJson(property);
+  }
+
   return result;
 }
 
@@ -110,6 +143,49 @@ AnimNodeResource sAnimGraphNodeFromJson(const json& json_node) {
   result.m_socket_accessor =
       AnimNodeAccessorFactory(result.m_type_name, result.m_anim_node);
 
+  for (size_t j = 0, n = result.m_socket_accessor->m_properties.size(); j < n;
+       j++) {
+    Socket& property = result.m_socket_accessor->m_properties[j];
+    json json_property = json_node["properties"][property.m_name];
+
+    if (sSocketTypeToStr(property.m_type) == json_property["type"]) {
+      if (property.m_type == SocketType::SocketTypeBool) {
+        result.m_socket_accessor->SetProperty<bool>(
+            property.m_name,
+            json_property["value"]);
+      } else if (property.m_type == SocketType::SocketTypeAnimation) {
+      } else if (property.m_type == SocketType::SocketTypeFloat) {
+        result.m_socket_accessor->SetProperty<float>(
+            property.m_name,
+            json_property["value"]);
+      } else if (property.m_type == SocketType::SocketTypeVec3) {
+        Vec3* property_vec3 = reinterpret_cast<Vec3*>(property.m_value.ptr);
+        (*property_vec3)[0] = json_property["value"][0];
+        (*property_vec3)[1] = json_property["value"][1];
+        (*property_vec3)[2] = json_property["value"][2];
+      } else if (property.m_type == SocketType::SocketTypeQuat) {
+        Quat* property_quat = reinterpret_cast<Quat*>(property.m_value.ptr);
+        (*property_quat)[0] = json_property["value"][0];
+        (*property_quat)[1] = json_property["value"][1];
+        (*property_quat)[2] = json_property["value"][2];
+        (*property_quat)[3] = json_property["value"][3];
+      } else if (property.m_type == SocketType::SocketTypeString) {
+        result.m_socket_accessor->SetProperty<std::string>(
+            property.m_name,
+            json_property["value"]);
+      } else {
+        std::cerr << "Invalid type for property '" << property.m_name
+                  << "'. Cannot parse json to type '"
+                  << static_cast<int>(property.m_type) << std::endl;
+        break;
+      }
+    } else {
+      std::cerr << "Invalid type for property '" << property.m_name
+                << "': expected " << sSocketTypeToStr(property.m_type)
+                << " but got " << json_property["type"] << std::endl;
+    }
+  }
+
   return result;
 }
 
@@ -144,6 +220,14 @@ AnimGraphConnection sAnimGraphConnectionFromJson(const json& json_node) {
 
 void AnimGraphResource::clear() {
   m_name = "";
+
+  clearNodes();
+  m_connections.clear();
+
+  initGraphConnectors();
+}
+
+void AnimGraphResource::clearNodes() {
   for (size_t i = 0; i < m_nodes.size(); i++) {
     delete m_nodes[i].m_socket_accessor;
     m_nodes[i].m_socket_accessor = nullptr;
@@ -151,13 +235,13 @@ void AnimGraphResource::clear() {
     m_nodes[i].m_anim_node = nullptr;
   }
   m_nodes.clear();
+}
 
+void AnimGraphResource::initGraphConnectors() {
   m_nodes.push_back(AnimNodeResourceFactory("BlendTree"));
   m_nodes[0].m_name = "Outputs";
   m_nodes.push_back(AnimNodeResourceFactory("BlendTree"));
   m_nodes[1].m_name = "Inputs";
-
-  m_connections.clear();
 }
 
 bool AnimGraphResource::saveToFile(const char* filename) const {
@@ -220,6 +304,7 @@ bool AnimGraphResource::loadFromFile(const char* filename) {
   }
 
   clear();
+  clearNodes();
 
   m_name = json_data["name"];
   for (size_t i = 0; i < json_data["nodes"].size(); i++) {
@@ -263,10 +348,16 @@ bool AnimGraphResource::loadFromFile(const char* filename) {
         sJsonToSocket(graph_inputs[i]));
   }
 
-  return false;
+  return true;
 }
 
-void* AnimGraph::GetOutput(const std::string& name) {
+void AnimGraph::MarkActiveNodes() {
+  m_frame_counter++;
+
+  // TODO: start from output and trigger updating of the frame counter.
+}
+
+void* AnimGraph::GetOutput(const std::string& name) const {
   Socket* socket = m_socket_accessor->FindInputSocket(name);
   if (socket == nullptr) {
     return nullptr;
@@ -275,11 +366,13 @@ void* AnimGraph::GetOutput(const std::string& name) {
   return socket->m_value.ptr;
 }
 
-void* AnimGraph::GetInput(const std::string& name) {
+void* AnimGraph::GetInput(const std::string& name) const {
   Socket* socket = m_socket_accessor->FindOutputSocket(name);
   if (socket == nullptr) {
     return nullptr;
   }
 
   return *(socket->m_value.ptr_ptr);
+}
+
 }

src/AnimGraphResource.h

@@ -14,6 +14,8 @@
 
 #include "SyncTrack.h"
 
+namespace AnimGraphCode {
+
 enum class SocketType {
   SocketTypeUndefined,
   SocketTypeBool,
@@ -24,6 +26,8 @@ enum class SocketType {
   SocketTypeString
 };
 
+enum SocketFlags { SocketFlagAffectsTime = 1 };
+
 struct AnimData {
   float m_bone_transforms[16];
 };
@@ -61,6 +65,7 @@ struct Socket {
     void** ptr_ptr;
   };
   SocketValue m_value = {nullptr};
+  int m_flags = 0;
   size_t m_type_size = 0;
 };
 
@@ -84,13 +89,21 @@ struct AnimNode {
   bool m_is_time_synced;
   float m_time_now;
   float m_time_last;
+  int m_frame_counter = 0;
   SyncTrack m_sync_track;
 };
 
+struct AnimNodeInput {
+  AnimNode* m_node;
+  std::string m_input_name;
+};
+
 struct NodeSocketAccessorBase {
   NodeSocketAccessorBase() {}
   virtual ~NodeSocketAccessorBase() {}
 
+  virtual void UpdateFlags(){};
+
   Socket* FindSocket(std::vector<Socket>& sockets, const std::string& name) {
     Socket* result = nullptr;
     for (size_t i = 0, n = sockets.size(); i < n; i++) {
@@ -140,11 +153,40 @@ struct NodeSocketAccessorBase {
     return -1;
   }
 
+  template <typename T>
+  T GetSocketValue(
+      const std::vector<Socket>& sockets,
+      const std::string& name,
+      T default_value) {
+    const Socket* socket = FindSocket(sockets, name);
+    if (socket == nullptr) {
+      return default_value;
+    }
+
+    return *static_cast<T*>(socket->m_value.ptr);
+  }
+
+  template <typename T>
+  void SetSocketValue(
+      const std::vector<Socket>& sockets,
+      const std::string& name,
+      const T& value) {
+    const Socket* socket = FindSocket(sockets, name);
+    if (socket == nullptr) {
+      std::cerr << "Error: could not set value of socket with name " << name
+                << ": no socket found." << std::endl;
+      return;
+    }
+
+    *static_cast<T*>(socket->m_value.ptr) = value;
+  }
+
   template <typename T>
   bool RegisterSocket(
       std::vector<Socket>& sockets,
       const std::string& name,
-      T* value_ptr) {
+      T* value_ptr,
+      int flags = 0) {
     Socket* socket = FindSocket(sockets, name);
     if (socket != nullptr) {
       std::cerr << "Socket " << name << " already registered." << std::endl;
@@ -155,6 +197,7 @@ struct NodeSocketAccessorBase {
     socket = &sockets[sockets.size() - 1];
     socket->m_name = name;
     socket->m_type_size = sizeof(T);
+    socket->m_flags = flags;
 
     if constexpr (std::is_same<T, float>::value) {
       socket->m_type = SocketType::SocketTypeFloat;
@@ -194,20 +237,20 @@ struct NodeSocketAccessorBase {
     return RegisterSocket(m_properties, name, value);
   }
   template <typename T>
-  bool SetProperty(const std::string& name, T value) {
-    return SetSocketValue(m_properties, name, value);
+  void SetProperty(const std::string& name, const T& value) {
+    SetSocketValue(m_properties, name, value);
   }
   template <typename T>
-  T GetProperty(const std::string& name, T value) {
-    return GetSocketValue(m_properties, name, value);
+  T GetProperty(const std::string& name, T default_value) {
+    return GetSocketValue(m_properties, name, default_value);
   }
   SocketType GetPropertyType(const std::string& name) {
     return GetSocketType(m_properties, name);
   }
 
   template <typename T>
-  bool RegisterInput(const std::string& name, T* value) {
-    return RegisterSocket(m_inputs, name, value);
+  bool RegisterInput(const std::string& name, T* value, int flags = 0) {
+    return RegisterSocket(m_inputs, name, value, flags);
   }
   template <typename T>
   T* GetInput(const std::string& name, T* value) {
@@ -224,8 +267,8 @@ struct NodeSocketAccessorBase {
   }
 
   template <typename T>
-  bool RegisterOutput(const std::string& name, T** value) {
-    return RegisterSocket(m_outputs, name, value);
+  bool RegisterOutput(const std::string& name, T** value, int flags = 0) {
+    return RegisterSocket(m_outputs, name, value, flags);
   }
   SocketType GetOutputType(const std::string& name) {
     return GetSocketType(m_outputs, name);
@@ -275,12 +318,26 @@ struct NodeSocketAccessor<Blend2Node> : public NodeSocketAccessorBase {
     Blend2Node* node = dynamic_cast<Blend2Node*>(node_);
     RegisterInput("Input0", &node->m_input0);
     RegisterInput("Input1", &node->m_input1);
-    RegisterInput("Weight", &node->m_blend_weight);
+    RegisterInput(
+        "Weight",
+        &node->m_blend_weight,
+        SocketFlags::SocketFlagAffectsTime);
 
     RegisterOutput("Output", &node->m_output);
 
     RegisterProperty("Sync", &node->m_sync_blend);
   }
+
+  virtual void UpdateFlags() override {
+    Socket* weight_input_socket = FindSocket(m_inputs, "Weight");
+    assert(weight_input_socket != nullptr);
+
+    if (GetProperty<bool>("Sync", false) == true) {
+      weight_input_socket->m_flags = SocketFlags::SocketFlagAffectsTime;
+    } else {
+      weight_input_socket->m_flags = 0;
+    }
+  }
 };
 
 struct SpeedScaleNode : public AnimNode {
@@ -293,7 +350,10 @@ template <>
 struct NodeSocketAccessor<SpeedScaleNode> : public NodeSocketAccessorBase {
   NodeSocketAccessor(AnimNode* node_) {
     SpeedScaleNode* node = dynamic_cast<SpeedScaleNode*>(node_);
-    RegisterInput("SpeedScale", &node->m_speed_scale);
+    RegisterInput(
+        "SpeedScale",
+        &node->m_speed_scale,
+        SocketFlags::SocketFlagAffectsTime);
     RegisterInput("Input", &node->m_input);
 
     RegisterOutput("Output", &node->m_output);
@@ -337,16 +397,14 @@ struct AnimGraphResource {
   AnimGraphResource() { clear(); }
 
   void clear();
+  void clearNodes();
+  void initGraphConnectors();
   bool saveToFile(const char* filename) const;
   bool loadFromFile(const char* filename);
 
-  AnimNodeResource& getGraphOutputNode() {
-    return m_nodes[0];
-  }
+  AnimNodeResource& getGraphOutputNode() { return m_nodes[0]; }
 
-  AnimNodeResource& getGraphInputNode() {
-    return m_nodes[1];
-  }
+  AnimNodeResource& getGraphInputNode() { return m_nodes[1]; }
 
   size_t addNode(AnimNodeResource node_resource) {
     m_nodes.push_back(node_resource);
@@ -463,12 +521,19 @@ struct AnimGraph {
     delete m_socket_accessor;
   }
 
+  void MarkActiveNodes();
+  bool CheckNodeActive(int node_index) {
+    assert(node_index < m_nodes.size());
+    return m_nodes[node_index]->m_frame_counter == m_frame_counter;
+  }
   void UpdateTime(float dt);
   void Evaluate();
 
+  int m_frame_counter;
   AnimData m_local_transforms;
+
   std::vector<AnimNode*> m_nodes;
-  std::vector<std::vector<AnimNode*> > m_node_inputs;
+  std::vector<std::vector<AnimNodeInput> > m_node_inputs;
   NodeSocketAccessorBase* m_socket_accessor;
   char* m_input_buffer = nullptr;
   char* m_output_buffer = nullptr;
@@ -476,8 +541,24 @@ struct AnimGraph {
   std::vector<Socket>& GetGraphOutputs() { return m_socket_accessor->m_inputs; }
   std::vector<Socket>& GetGraphInputs() { return m_socket_accessor->m_outputs; }
 
-  void* GetOutput(const std::string& name);
-  void* GetInput(const std::string& name);
+  void* GetOutput(const std::string& name) const;
+  void* GetInput(const std::string& name) const;
+
+  AnimNode* getAnimNodeForInput(
+      size_t node_index,
+      const std::string& input_name) {
+    assert(node_index < m_nodes.size());
+    assert(node_index < m_node_inputs.size());
+
+    std::vector<AnimNodeInput>& node_inputs = m_node_inputs[node_index];
+    for (size_t i = 0, n = node_inputs.size(); i < n; i++) {
+      if (node_inputs[i].m_input_name == input_name) {
+        return node_inputs[i].m_node;
+      }
+    }
+
+    return nullptr;
+  }
 
   AnimNode* getAnimNode(const char* name) {
     for (size_t i = 0; i < m_nodes.size(); i++) {
@@ -510,7 +591,21 @@ struct AnimGraph {
       node->m_name = node_resource.m_name;
       node->m_node_type_name = node_resource.m_type_name;
       result.m_nodes.push_back(node);
-      result.m_node_inputs.push_back(std::vector<AnimNode*>());
+
+      assert(node_resource.m_socket_accessor != nullptr);
+      result.m_node_inputs.push_back(std::vector<AnimNodeInput>());
+      std::vector<AnimNodeInput>& node_inputs = result.m_node_inputs.back();
+      for (int j = 0, n = node_resource.m_socket_accessor->m_inputs.size();
+           j < n;
+           j++) {
+        const Socket& input_socket =
+            node_resource.m_socket_accessor->m_inputs[j];
+        AnimNodeInput input;
+        input.m_node = nullptr;
+        input.m_input_name = input_socket.m_name;
+
+        node_inputs.push_back(input);
+      }
     }
 
     // Prepare graph inputs
@@ -636,7 +731,14 @@ struct AnimGraph {
       (*source_socket->m_value.ptr_ptr) = target_socket->m_value.ptr;
 
       size_t target_node_index = result.getAnimNodeIndex(target_node);
-      result.m_node_inputs[target_node_index].push_back(source_node);
+
+      std::vector<AnimNodeInput>& node_inputs =
+          result.m_node_inputs[target_node_index];
+      for (int j = 0, n = node_inputs.size(); j < n; j++) {
+        if (node_inputs[j].m_input_name == target_socket->m_name) {
+          node_inputs[j].m_node = source_node;
+        }
+      }
 
       if (target_node_accessor != result.m_socket_accessor) {
         delete target_node_accessor;
@@ -651,4 +753,6 @@ struct AnimGraph {
   }
 };
 
+}  // namespace AnimGraphCode
+
 #endif  //ANIMTESTBED_ANIMGRAPHRESOURCE_H

tests/AnimGraphResourceTests.cc

@@ -5,6 +5,8 @@
 #include "AnimGraphResource.h"
 #include "catch.hpp"
 
+using namespace AnimGraphCode;
+
 TEST_CASE("BasicGraph", "[AnimGraphResource]") {
   AnimGraphResource graph_resource;
 
@@ -100,9 +102,10 @@ TEST_CASE("BasicGraph", "[AnimGraphResource]") {
 
   CHECK(graph.m_node_inputs[anim_sampler_index0].size() == 0);
   CHECK(graph.m_node_inputs[anim_sampler_index1].size() == 0);
-  CHECK(graph.m_node_inputs[blend_index].size() == 2);
-  CHECK(graph.m_node_inputs[blend_index][0] == anim_sampler_instance0);
-  CHECK(graph.m_node_inputs[blend_index][1] == anim_sampler_instance1);
+  CHECK(graph.m_node_inputs[blend_index].size() == 3);
+  CHECK(graph.m_node_inputs[blend_index][0].m_node == anim_sampler_instance0);
+  CHECK(graph.m_node_inputs[blend_index][1].m_node == anim_sampler_instance1);
+  CHECK(graph.m_node_inputs[blend_index][2].m_node == nullptr);
 }
 
 TEST_CASE("InputAttributeConversion", "[AnimGraphResource]") {
@@ -324,12 +327,15 @@ TEST_CASE("GraphInputOutputConnectivity", "[AnimGraphResource]") {
 
         AnimData* graph_input0 = (AnimData*) anim_graph.GetInput("GraphAnimInput0");
         REQUIRE(graph_input0 == &blend2_node->m_input0);
+        REQUIRE(anim_graph.m_nodes[1] == anim_graph.getAnimNodeForInput(blend2_node_index, "Input0"));
 
         AnimData* graph_input1 = (AnimData*) anim_graph.GetInput("GraphAnimInput1");
         REQUIRE(graph_input1 == &blend2_node->m_input1);
+        REQUIRE(anim_graph.m_nodes[1] == anim_graph.getAnimNodeForInput(blend2_node_index, "Input1"));
 
         AnimData* graph_output = (AnimData*) anim_graph.GetOutput("GraphAnimOutput");
         REQUIRE(graph_output == blend2_node->m_output);
+        REQUIRE(anim_graph.m_nodes[blend2_node_index] == anim_graph.getAnimNodeForInput(0, "GraphAnimOutput"));
       }
     }
   }