Isolate implementation of RenderSource and new Non-Recursive mode

Separate files for RenderSource, make RenderSource playable, and implement two rendering mechanisms

RenderSource.h

@@ -0,0 +1,56 @@
+#ifndef RENDERSOURCE_H
+#define RENDERSOURCE_H
+
+#include "Source.h"
+
+
+
+class RenderSource : public Source
+{
+public:
+    RenderSource(uint64_t id = 0);
+    ~RenderSource();
+
+    // implementation of source API
+    void update (float dt) override;
+//    void setActive (bool on) override;
+    bool playing () const override { return !paused_; }
+    void play (bool) override;
+    void replay () override;
+    bool playable () const  override { return true; }
+    bool failed () const override;
+    uint texture() const override;
+    void accept (Visitor& v) override;
+
+    inline Session *session () const { return session_; }
+    inline void setSession (Session *se) { session_ = se; }
+
+    glm::vec3 resolution() const;
+
+    glm::ivec2 icon() const override;
+    std::string info() const override;
+
+    typedef enum {
+        RENDER_TEXTURE = 0,
+        RENDER_EXCLUSIVE
+    } RenderSourceMode;
+    static const char* render_mode_label[2];
+
+    void setRenderMode(RenderSourceMode m) { render_mode_ = m; }
+    RenderSourceMode renderMode() const { return render_mode_; }
+
+protected:
+
+    void init() override;
+    Session *session_;
+
+    FrameBuffer *rendered_output_;
+    Surface *rendered_surface_;
+
+    // control
+    bool paused_;
+    RenderSourceMode render_mode_;
+};
+
+
+#endif // RENDERSOURCE_H