Evaluation of very simple graphs works.

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;