Initial integration of Mixer, Views and Source classes.

First tests with user interface and Mixing View

View.h

@@ -0,0 +1,52 @@
+#ifndef VIEW_H
+#define VIEW_H
+
+#include <glm/glm.hpp>
+
+#include "Scene.h"
+class FrameBuffer;
+
+class View
+{
+public:
+    View();
+
+    virtual void update (float dt);
+    virtual void draw () = 0;
+    virtual void zoom (float) {}
+    virtual void drag (glm::vec2, glm::vec2) {}
+
+    Scene scene;
+
+protected:
+    Group backgound_;
+    Group foreground_;
+};
+
+
+class MixingView : public View
+{
+public:
+    MixingView();
+    ~MixingView();
+
+    void draw () override;
+    void zoom (float factor);
+    void drag (glm::vec2 from, glm::vec2 to);
+};
+
+class RenderView : public View
+{
+    FrameBuffer *frame_buffer_;
+
+public:
+    RenderView ();
+    ~RenderView ();
+
+    void draw () override;
+
+    void setResolution (uint width, uint height);
+    inline FrameBuffer *frameBuffer () const { return frame_buffer_; }
+
+};
+#endif // VIEW_H