began draft of internal node rendering structure

app/node/generator/solid/solid.h

@@ -0,0 +1,17 @@
+#ifndef SOLIDGENERATOR_H
+#define SOLIDGENERATOR_H
+
+#include "node/node.h"
+
+class SolidGenerator : public Node
+{
+public:
+  SolidGenerator(QObject* parent = nullptr);
+
+  virtual void Process(const rational &time) override;
+
+private:
+  NodeOutput* texture_output_;
+};
+
+#endif // SOLIDGENERATOR_H