shift renderer prototype to new node structure

app/node/input.h

@@ -54,6 +54,24 @@ public:
    */
   bool can_accept_type(const DataType& data_type);
 
+  /**
+   * @brief If this input is connected to an output, retrieve the output parameter
+   *
+   * @return
+   *
+   * The output parameter if connected or nullptr if not
+   */
+  NodeOutput* get_connected_output();
+
+  /**
+   * @brief If this input is connected to an output, retrieve the Node whose output is connected
+   *
+   * @return
+   *
+   * The connected Node if connected or nullptr if not
+   */
+  Node* get_connected_node();
+
   /**
    * @brief Get the value at a given time
    *
@@ -109,16 +127,6 @@ private:
    */
   QList<NodeKeyframe> keyframes_;
 
-  /**
-   * @brief Currently cached value
-   */
-  QVariant value_;
-
-  /**
-   * @brief Last timecode that a value was requested with
-   */
-  rational time_;
-
   /**
    * @brief Internal keyframing enabled setting
    */