added changes from QOpenGL branch to enable and use GLDebugLogger when

OpenFlipper is started with the -d parameter

see https://www.graphics.rwth-aachen.de:9000/OpenFlipper-Free/OpenFlipper-Free/merge_requests/303 for build and integration status

widgets/glWidget/QtBaseViewer.cc

@@ -133,6 +133,9 @@ glViewer::glViewer( QGraphicsScene* _scene,
   projectionUpdateLocked_(false),
   glScene_(_scene),
   glWidget_(_glWidget),
+#if (QT_VERSION >= QT_VERSION_CHECK(5,1,0))
+  glDebugLogger_(0),
+#endif
   pickCache_(0),
   updatePickCache_(true),
   pickCacheSupported_(true),
@@ -210,6 +213,8 @@ glViewer::glViewer( QGraphicsScene* _scene,
 glViewer::~glViewer()
 {
   delete glstate_;
+
+  deleteGLDebugLogger();
 }
 
 
@@ -1026,6 +1031,10 @@ void glViewer::initializeGL()
     sceneGraph ( sceneGraphRoot_, maxPases,bbmin,bbmax,true);
     viewAll();
   }
+
+
+  // qt opengl  info
+  startGLDebugLogger();
 }