Fix issue with taking screenshots from an FBO

panda/src/display/displayRegion.cxx

@@ -491,6 +491,12 @@ get_screenshot() {
     return NULL;
   }
 
+  {
+    // Make sure that the correct viewport is active.
+    DisplayRegionPipelineReader dr_reader(this, current_thread);
+    gsg->prepare_display_region(&dr_reader);
+  }
+
   PT(Texture) tex = new Texture;
 
   RenderBuffer buffer = gsg->get_render_buffer(get_screenshot_buffer_type(),

panda/src/glstuff/glGraphicsBuffer_src.cxx

@@ -269,6 +269,9 @@ begin_frame(FrameMode mode, Thread *current_thread) {
       }
     }
 #endif
+  } else if (mode == FM_refresh) {
+    // Just bind the FBO.
+    rebuild_bitplanes();
   }
 
   _gsg->set_current_properties(&get_fb_properties());