private void ReturnFreeBuffer(CommandBufferPooledExclusiveUse buff)
        {
            int ccap;

            lock (_unavailable)
                ccap = _available.Count + _unavailable.Count;
            if (ccap > _capacity)
            {
                buff.Dispose();
                return;
            }

            _available.Enqueue(buff);
        }
 public void Return(CommandBufferPooledExclusiveUse buff)
 {
     buff.AssertValid();
     Debug.Assert(!buff.IsBuilding, "Command buffer is currently building");
     Debug.Assert(buff.CommandPool == this, "Command pool isn't this");
     if (buff.IsSubmitted)
     {
         lock (_unavailable)
             _unavailable.Add(buff);
     }
     else
     {
         ReturnFreeBuffer(buff);
     }
 }