check for gl errors after creating projectm instance

Author: hack-s

src/gstglbaseaudiovisualizer.c

@@ -298,7 +298,7 @@ gst_gl_base_audio_visualizer_render (GstAudioVisualizer *bscope, GstBuffer *audi
 
     g_rec_mutex_lock (&glav->priv->context_lock);
 
-    // make params privately accessible to the plugin
+    // wrap params into cb_params struct to pass them to the GL window/thread via userdata pointer
     cb_params.glav = glav;
     cb_params.in_audio = audio;
     cb_params.out_video = video;

src/plugin.c

@@ -234,6 +234,7 @@ static gboolean gst_projectm_gl_start(GstGLBaseAudioVisualizer *glav)
       GST_ERROR_OBJECT(plugin, "ProjectM could not be initialized");
       return FALSE;
     }
+    gl_error_handler(glav->context, plugin);
   }
 
   return TRUE;