Added glFlush before sending VB/IB to fronted renderer

drape_frontend/backend_renderer.cpp

@@ -287,6 +287,7 @@ void BackendRenderer::RecacheMyPosition()
   auto msg = make_unique_dp<MyPositionShapeMessage>(make_unique_dp<MyPosition>(m_texMng),
                                                     make_unique_dp<SelectionShape>(m_texMng));
 
+  GLFunctions::glFlush();
   m_commutator->PostMessage(ThreadsCommutator::RenderThread, move(msg), MessagePriority::High);
 }
 

drape_frontend/gui/layer_render.cpp

@@ -176,6 +176,9 @@ drape_ptr<LayerRenderer> LayerCacher::RecacheWidgets(TWidgetsInitInfo const & in
       sizeInfo[node.first] = cacheFunction->second(node.second, make_ref(renderer), textures);
   }
 
+  // Flush gui geometry.
+  GLFunctions::glFlush();
+
   return renderer;
 }
 
@@ -191,6 +194,10 @@ drape_ptr<LayerRenderer> LayerCacher::RecacheCountryStatus(ref_ptr<dp::TextureMa
   RegisterButtonHandler(handlers, CountryStatusHelper::BUTTON_TRY_AGAIN);
 
   renderer->AddShapeRenderer(WIDGET_COUNTRY_STATUS, countryStatus.Draw(textures, handlers));
+
+  // Flush gui geometry.
+  GLFunctions::glFlush();
+
   return renderer;
 }
 

drape_frontend/route_builder.cpp

@@ -25,6 +25,9 @@ void RouteBuilder::Build(m2::PolylineD const & routePolyline, vector<double> con
   routeData->m_sourceTurns = turns;
   RouteShape(params).Draw(textures, *routeData.get());
 
+  // Flush route geometry.
+  GLFunctions::glFlush();
+
   if (m_flushRouteFn != nullptr)
     m_flushRouteFn(move(routeData));
 }
@@ -45,6 +48,9 @@ void RouteBuilder::BuildSign(m2::PointD const & pos, bool isStart, bool isValid,
     RouteShape(params).CacheRouteSign(textures, *routeSignData.get());
   }
 
+  // Flush route sign geometry.
+  GLFunctions::glFlush();
+
   if (m_flushRouteSignFn != nullptr)
     m_flushRouteSignFn(move(routeSignData));
 }