Upload "fix" for globebrowsing stuttering

src/scene/scene.cpp

@@ -316,6 +316,15 @@ void Scene::render(const RenderData& data, RendererTasks& tasks) {
         if (global::callback::webBrowserPerformanceHotfix) {
             (*global::callback::webBrowserPerformanceHotfix)();
         }
+
+        // @TODO(abock 2019-08-19) This glGetError call is a hack to prevent the GPU
+        // thread and the CPU thread from diverging too much, particularly the uploading
+        // of a lot of textures for the globebrowsing planets can cause a hard stuttering
+        // effect. Asking for a glGetError after every rendering call will force the
+        // threads to implicitly synchronize and thus prevent the stuttering.  The better
+        // solution would be to reduce the number of uploads per frame, use a staggered
+        // buffer, or something else like that preventing a large spike in uploads
+        glGetError();
     }
 }