Evaluation of very simple graphs works.

src/AnimGraph/AnimGraph.h

@@ -49,6 +49,27 @@ struct AnimGraph {
         }
       }
     }
+    m_node_input_connections.clear();
+
+    if (m_node_output_connections.size() > 0) {
+      std::vector<AnimGraphConnection>& graph_inputs =
+          m_node_output_connections[0];
+
+      for (size_t i = 0, n = graph_inputs.size(); i < n; i++) {
+        AnimGraphConnection& connection = graph_inputs[i];
+        if (connection.m_target_socket.m_type
+            == SocketType::SocketTypeAnimation) {
+          AnimData* graph_anim_output = static_cast<AnimData*>(
+              connection.m_target_socket.m_reference.ptr);
+          assert(graph_anim_output != nullptr);
+
+          // we have to explicitly call the destructor as the AnimData* was
+          // initialized using a placement new operator.
+          graph_anim_output->m_local_matrices.vector::~vector();
+        }
+      }
+    }
+    m_node_output_connections.clear();
 
     delete[] m_input_buffer;
     delete[] m_output_buffer;
@@ -56,6 +77,7 @@ struct AnimGraph {
     for (int i = 0; i < m_nodes.size(); i++) {
       delete m_nodes[i];
     }
+    m_nodes.clear();
 
     delete m_socket_accessor;
   }

src/AnimGraph/AnimGraphData.h

@@ -416,10 +416,10 @@ inline void NodeSocketAccessorBase::SetSocketValue<const bool&>(
 }
 
 template <>
-inline void NodeSocketAccessorBase::SetSocketValue<const float&>(
+inline void NodeSocketAccessorBase::SetSocketValue<float>(
     Socket* socket,
-    const float& value) {
-  socket->m_value.float_value = value;
+    float value) {
+  *static_cast<float*>(socket->m_reference.ptr) = value;
 }
 
 template <>

src/AnimGraph/AnimGraphEditor.cc

@@ -85,7 +85,7 @@ void AnimGraphEditorRenderSidebar(
     if (property.m_type == SocketType::SocketTypeFloat) {
       ImGui::SliderFloat(
           property.m_name.c_str(),
-          reinterpret_cast<float*>(property.m_reference.ptr),
+          reinterpret_cast<float*>(&property.m_value.float_value),
           -100.f,
           100.f);
     } else if (property.m_type == SocketType::SocketTypeBool) {
@@ -219,6 +219,10 @@ void AnimGraphEditorUpdate() {
         node_type_name = "MathFloatToVec3Node";
       }
 
+      if (ImGui::MenuItem("ConstScalarNode")) {
+        node_type_name = "ConstScalarNode";
+      }
+
       if (node_type_name != "") {
         AnimNodeResource node_resource =
             AnimNodeResourceFactory(node_type_name);

src/AnimGraph/AnimGraphNodes.cc

@@ -65,6 +65,8 @@ bool AnimSamplerNode::Init(AnimGraphContext& context) {
       return false;
     }
 
+    archive >> *m_animation;
+
     context.m_animation_map[m_filename] = m_animation;
   }
 

src/AnimGraph/AnimGraphNodes.h

@@ -197,6 +197,11 @@ struct AnimSamplerNode : public AnimNode {
 
   virtual ~AnimSamplerNode();
   virtual bool Init(AnimGraphContext& context) override;
+  void UpdateTime(float time_last, float time_now) override {
+    m_time_last = time_last;
+    m_time_now = fmodf(time_last + (time_now - time_last), m_animation->duration());
+    m_state = AnimNodeEvalState::TimeUpdated;
+  }
   virtual void Evaluate(AnimGraphContext& context) override;
 };
 
@@ -210,6 +215,27 @@ struct NodeSocketAccessor<AnimSamplerNode> : public NodeSocketAccessorBase {
   }
 };
 
+//
+// ConstScalarNode
+//
+struct ConstScalarNode : public AnimNode {
+  float* o_value = nullptr;
+  float value = 0.f;
+
+  virtual void Evaluate(AnimGraphContext& context){
+    *o_value = value;
+  };
+};
+
+template <>
+struct NodeSocketAccessor<ConstScalarNode> : public NodeSocketAccessorBase {
+  NodeSocketAccessor(AnimNode* node_) {
+    ConstScalarNode* node = dynamic_cast<ConstScalarNode*>(node_);
+    RegisterOutput("ScalarOutput", &node->o_value);
+    RegisterProperty("ScalarValue", &node->value);
+  }
+};
+
 //
 // MathAddNode
 //
@@ -236,7 +262,6 @@ struct NodeSocketAccessor<MathAddNode> : public NodeSocketAccessorBase {
   }
 };
 
-
 //
 // MathFloatToVec3Node
 //
@@ -282,6 +307,8 @@ static inline AnimNode* AnimNodeFactory(const std::string& name) {
     result = new MathAddNode;
   } else if (name == "MathFloatToVec3Node") {
     result = new MathFloatToVec3Node;
+  } else if (name == "ConstScalarNode") {
+    result = new ConstScalarNode;
   }
 
   if (result != nullptr) {
@@ -308,6 +335,8 @@ static inline NodeSocketAccessorBase* AnimNodeAccessorFactory(
     return new NodeSocketAccessor<MathAddNode>(node);
   } else if (node_type_name == "MathFloatToVec3Node") {
     return new NodeSocketAccessor<MathFloatToVec3Node>(node);
+  } else if (node_type_name == "ConstScalarNode") {
+    return new NodeSocketAccessor<ConstScalarNode>(node);
   } else {
     std::cerr << "Invalid node type name " << node_type_name << "."
               << std::endl;

src/AnimGraph/AnimGraphResource.cc

@@ -534,7 +534,7 @@ void AnimGraphResource::setRuntimeNodeProperties(AnimGraph& instance) const {
               property.m_value.flag);
           break;
         case SocketType::SocketTypeFloat:
-          node_instance_accessor->SetPropertyReferenceValue(
+          node_instance_accessor->SetPropertyValue(
               name,
               property.m_value.float_value);
           break;

src/main.cc

@@ -383,6 +383,7 @@ int main() {
 
   AnimGraph anim_graph;
   AnimGraphContext anim_graph_context;
+  AnimData* anim_graph_output = nullptr;
 
   state.time.factor = 1.0f;
 
@@ -505,15 +506,15 @@ int main() {
         &gApplicationConfig.window_size[0],
         &gApplicationConfig.window_size[1]);
 
+    state.time.frame = stm_sec(
+        stm_round_to_common_refresh_rate(stm_laptime(&state.time.laptime)));
+
     if (!state.time.paused) {
-      state.time.frame = stm_sec(
-          stm_round_to_common_refresh_rate(stm_laptime(&state.time.laptime)));
-
       state.time.absolute += state.time.frame * state.time.factor;
+    }
 
-      if (state.ozz.animation != nullptr) {
-        state.time.absolute = fmodf (state.time.absolute, state.ozz.animation->duration());
-      }
+    if (state.ozz.animation != nullptr) {
+      state.time.absolute = fmodf (state.time.absolute, state.ozz.animation->duration());
     }
 
     int cur_width, cur_height;
@@ -616,9 +617,20 @@ int main() {
 
       if (ImGui::Button("Update Runtime Graph")) {
         anim_graph.dealloc();
+        anim_graph_output = nullptr;
+
         AnimGraphEditorGetRuntimeGraph(anim_graph);
         anim_graph_context.m_skeleton = &skinned_mesh.m_skeleton;
         anim_graph.init(anim_graph_context);
+
+        // For simplicity use first animation data output
+        const std::vector<Socket>& graph_output_sockets = anim_graph.getGraphOutputs();
+        for (int i = 0; i < graph_output_sockets.size(); i++) {
+          const Socket& output = graph_output_sockets[i];
+          if (output.m_type == SocketType::SocketTypeAnimation) {
+            anim_graph_output = static_cast<AnimData*>(output.m_reference.ptr);
+          }
+        }
       }
 
       ImGui::EndMainMenuBar();
@@ -711,6 +723,11 @@ int main() {
           }
         }
 
+        ImGui::SameLine();
+        if (ImGui::Button("Step")) {
+          state.time.absolute += state.time.frame;
+        }
+
         if (state.ozz.animation != nullptr) {
           ImGui::SameLine();
 
@@ -741,6 +758,14 @@ int main() {
         skinned_mesh.CalcModelMatrices();
       }
 
+      if (state.time.use_graph && anim_graph.m_nodes.size() > 0) {
+        anim_graph.updateTime(state.time.frame);
+        anim_graph.evaluate(anim_graph_context);
+        skinned_mesh.m_local_matrices = anim_graph_output->m_local_matrices;
+
+        skinned_mesh.CalcModelMatrices();
+      }
+
       sgl_defaults();
       sgl_matrix_mode_projection();
       sgl_load_matrix((const float*)&state.camera.mtxProj);