finished prototype of nodes providing a texture to a viewer

app/node/node.cpp

@@ -24,3 +24,48 @@ Node::Node(QObject *parent) :
   QObject(parent)
 {
 }
+
+QString Node::Category()
+{
+  // Return an empty category for any nodes that don't use one
+  return QString();
+}
+
+QString Node::Description()
+{
+  // Return an empty string by default
+  return QString();
+}
+
+void Node::InvalidateCache(const rational &start_range, const rational &end_range)
+{
+  Q_UNUSED(start_range)
+  Q_UNUSED(end_range)
+
+  /*
+  ParamList params = Parameters();
+
+  for (int i=0;i<params.size();i++) {
+    NodeParam* param = params.at(i);
+
+    if (param->type() == NodeParam::kOutput
+        && param->) {
+
+    }
+  }
+  */
+}
+
+Node::ParamList Node::Parameters()
+{
+  const QObjectList& child_list = children();
+
+  ParamList params;
+  params.reserve(child_list.size());
+
+  for (int i=0;i<child_list.size();i++) {
+    params[i] = static_cast<NodeParam*>(child_list.at(i));
+  }
+
+  return params;
+}