minor render thread refactor

rendering/framebufferobject.h

@@ -0,0 +1,24 @@
+#ifndef FRAMEBUFFEROBJECT_H
+#define FRAMEBUFFEROBJECT_H
+
+#include <QOpenGLContext>
+
+class FramebufferObject
+{
+public:
+  FramebufferObject();
+  ~FramebufferObject();
+
+  bool IsCreated();
+  void Create(QOpenGLContext* ctx, int width, int height);
+  void Destroy();
+
+  const GLuint& buffer();
+  const GLuint& texture();
+private:
+  QOpenGLContext* ctx_;
+  GLuint buffer_;
+  GLuint texture_;
+};
+
+#endif // FRAMEBUFFEROBJECT_H