Use the ICustomView Pointer

Back in the PluginCore's PluginCore::processMessage( ) function, we add the code to the handler for the PLUGINGUI_TIMERPING message that will pump out the queued audio data and call the repaint message on the custom view object. Note that we are sharing the same lock-free ring buffer that the PluginCore object owns and distributing (copying) data to both custom views:

case PLUGINGUI_TIMERPING:
{
   if (waveView || spectrumView)
   {
      float audioSample = 0.0;
 
      // --- try to get a value from queue
      bool success = customViewDataQueue.try_dequeue(audioSample);
 
      // --- if succeeds:
      if (success)
      {
         // --- empty queue into views; the each handle this differently
         while (success)
         {
            if (waveView)
               waveView->pushDataValue(audioSample);
 
            if (spectrumView)
               spectrumView->pushDataValue(audioSample);
 
            // -- try to get next value until queue is empty
            success = customViewDataQueue.try_dequeue(audioSample);
         }
      }
 
      // --- update and mark view as dirty
      if (waveView)
         waveView->updateView();
 
      if (spectrumView)
         spectrumView->updateView();
 
      return true;
   }
 
   return false;
}
//

This is all the code that you need to make the system work. The lock-free ring buffers and the custom view object handle the rest of the work.