text: // Include file for debug functions
  
  int DebugRedraw(R3SurfelViewer *viewer);
  int DebugResize(R3SurfelViewer *viewer, int w, int h);
  int DebugMouseMotion(R3SurfelViewer *viewer, int x, int y);
  int DebugMouseButton(R3SurfelViewer *viewer, int x, int y, int button, int state, int shift, int ctrl, int alt);
  int DebugKeyboard(R3SurfelViewer *viewer, int x, int y, int key, int shift, int ctrl, int alt);
  
  