1 files changed, 7 insertions, 1 deletions
diff --git a/src/jogl/classes/com/jogamp/opengl/util/stereo/StereoDevice.java b/src/jogl/classes/com/jogamp/opengl/util/stereo/StereoDevice.java
index 6d8b85d8e..d59863530 100644
--- a/src/jogl/classes/com/jogamp/opengl/util/stereo/StereoDevice.java
+++ b/src/jogl/classes/com/jogamp/opengl/util/stereo/StereoDevice.java
@@ -44,10 +44,16 @@ public interface StereoDevice {
     /** Return the factory used to create this device. */
     public StereoDeviceFactory getFactory();
 
-    /** Disposes this {@link StereoDevice}. */
+    /** Disposes this {@link StereoDevice}, if {@link #isValid() valid}. */
     public void dispose();
 
     /**
+     * Returns {@code true}, if instance is created and not {@link #dispose() disposed},
+     * otherwise returns {@code false}.
+     */
+    public boolean isValid();
+
+    /**
      * If operation within a device spanning virtual desktop,
      * returns the device position.
      * <p>