call AcquireNextFrame on isolated thread

Assets/uDesktopDuplication/Examples/Scripts/DisplacementMapping.cs

@@ -45,6 +45,10 @@ public class DisplacementMapping : MonoBehaviour
             case TargetMonitor.Next: ++id; break;
             case TargetMonitor.Prev: --id; break;
         }
+        if (uDesktopDuplication.Manager.monitorCount == 0)
+        {
+            return;
+        }
         id = Mathf.Clamp(id, 0, uDesktopDuplication.Manager.monitorCount - 1);
         var monitor = uDesktopDuplication.Manager.GetMonitor(id);
         monitor.shouldBeUpdated = true;

Assets/uDesktopDuplication/Scripts/Lib.cs

@@ -86,7 +86,7 @@ public static class Lib
     [DllImport("uDesktopDuplication")]
     public static extern void Finalize();
     [DllImport("uDesktopDuplication")]
-    public static extern void Reinitialize();
+    public static extern void Reinitialize(bool useThread);
     [DllImport("uDesktopDuplication")]
     public static extern void Update();
     [DllImport("uDesktopDuplication")]

Assets/uDesktopDuplication/Scripts/Manager.cs

@@ -57,6 +57,8 @@ public class Manager : MonoBehaviour
 
     [SerializeField] int desktopDuplicationApiTimeout = 0;
     [SerializeField] float retryReinitializationDuration = 1f;
+        [SerializeField]
+        bool useThread = false;
 
     private Coroutine renderCoroutine_ = null;
     private bool shouldReinitialize_ = false;
@@ -143,7 +145,7 @@ public class Manager : MonoBehaviour
     public void Reinitialize()
     {
         Debug.Log("[uDD] Reinitialize");
-        Lib.Reinitialize();
+        Lib.Reinitialize(useThread);
         CreateMonitors();
         if (onReinitialized != null) {
             onReinitialized();