add wireframe paint option,

write file information on the screen,
bug fixes

QtMeshViewer/Source/OglViewerWidget.cpp

@@ -226,7 +226,7 @@ void OglViewerWidget::paintGL()
 	m_program.setUniformValue("vp_matrix", m_projection * view);
 
 	// Draw cube geometry
-	m_dataEngine->drawGeometry(&m_program);
+	m_dataEngine->drawGeometry(&m_program, m_wireframe);
 }
 
 
@@ -293,3 +293,9 @@ void OglViewerWidget::changeDirection(int direction)
 		break;
 	}
 }
+
+void OglViewerWidget::toggleWireframe()
+{
+	m_wireframe = 1 - m_wireframe;
+	update();
+}