Clock: Use Clock.currentNanos() instead of System.nanoTime(); Enhancing FPSCounterImpl accuracy by maintaining timestamps in [ns]

Idea: Perhaps we want to use [ns] for FPSCounter's method types by now?

5 files changed, 97 insertions, 49 deletions

diff --git a/src/test/com/jogamp/opengl/test/bugs/Bug735Inv0AppletAWT.java b/src/test/com/jogamp/opengl/test/bugs/Bug735Inv0AppletAWT.java
index 7430dcd38..f30cda4f3 100644
--- a/src/test/com/jogamp/opengl/test/bugs/Bug735Inv0AppletAWT.java
+++ b/src/test/com/jogamp/opengl/test/bugs/Bug735Inv0AppletAWT.java
@@ -27,6 +27,7 @@ import com.jogamp.opengl.GLRunnable;
 import com.jogamp.opengl.GLUniformData;
 import com.jogamp.opengl.awt.GLCanvas;
 import com.jogamp.opengl.glu.GLU;
+import com.jogamp.common.os.Clock;
 import com.jogamp.common.util.InterruptSource;
 import com.jogamp.newt.awt.NewtCanvasAWT;
 import com.jogamp.newt.opengl.GLWindow;
@@ -90,26 +91,29 @@ public class Bug735Inv0AppletAWT extends Applet implements Runnable {
   private int fcount = 0, lastm = 0;
   private final int fint = 1;
 
-  public void init() {
+  @Override
+public void init() {
     setSize(APPLET_WIDTH, APPLET_HEIGHT);
     setPreferredSize(new Dimension(APPLET_WIDTH, APPLET_HEIGHT));
     width = APPLET_WIDTH;
     height = APPLET_HEIGHT;
   }
 
-  public void start() {
+  @Override
+public void start() {
     thread = new InterruptSource.Thread(null, this, "Animation Thread");
     thread.start();
   }
 
-  public void run() {
+  @Override
+public void run() {
     int noDelays = 0;
     // Number of frames with a delay of 0 ms before the
     // animation thread yields to other running threads.
     final int NO_DELAYS_PER_YIELD = 15;
     final int TIMEOUT_SECONDS = 2;
 
-    long beforeTime = System.nanoTime();
+    long beforeTime = Clock.currentNanos();
     long overSleepTime = 0L;
 
     millisOffset = System.currentTimeMillis();
@@ -125,13 +129,14 @@ public class Bug735Inv0AppletAWT extends Applet implements Runnable {
 
       if (frameCount == 1) {
         EventQueue.invokeLater(new Runnable() {
-          public void run() {
+          @Override
+        public void run() {
             requestFocusInWindow();
           }
         });
       }
 
-      final long afterTime = System.nanoTime();
+      final long afterTime = Clock.currentNanos();
       final long timeDiff = afterTime - beforeTime;
       final long sleepTime = (frameRatePeriod - timeDiff) - overSleepTime;
       if (sleepTime > 0) {  // some time left in this cycle
@@ -139,7 +144,7 @@ public class Bug735Inv0AppletAWT extends Applet implements Runnable {
           Thread.sleep(sleepTime / 1000000L, (int) (sleepTime % 1000000L));
           noDelays = 0;  // Got some sleep, not delaying anymore
         } catch (final InterruptedException ex) { }
-        overSleepTime = (System.nanoTime() - afterTime) - sleepTime;
+        overSleepTime = (Clock.currentNanos() - afterTime) - sleepTime;
       } else {    // sleepTime <= 0; the frame took longer than the period
         overSleepTime = 0L;
         noDelays++;
@@ -148,7 +153,7 @@ public class Bug735Inv0AppletAWT extends Applet implements Runnable {
           noDelays = 0;
         }
       }
-      beforeTime = System.nanoTime();
+      beforeTime = Clock.currentNanos();
     }
   }
 
@@ -418,7 +423,8 @@ public class Bug735Inv0AppletAWT extends Applet implements Runnable {
 
     // This allows to close the frame.
     frame.addWindowListener(new WindowAdapter() {
-      public void windowClosing(final WindowEvent e) {
+      @Override
+    public void windowClosing(final WindowEvent e) {
         System.exit(0);
       }
     });
diff --git a/src/test/com/jogamp/opengl/test/bugs/Bug735Inv1AppletAWT.java b/src/test/com/jogamp/opengl/test/bugs/Bug735Inv1AppletAWT.java
index b31a5f410..15826a8c0 100644
--- a/src/test/com/jogamp/opengl/test/bugs/Bug735Inv1AppletAWT.java
+++ b/src/test/com/jogamp/opengl/test/bugs/Bug735Inv1AppletAWT.java
@@ -27,6 +27,7 @@ import com.jogamp.opengl.GLRunnable;
 import com.jogamp.opengl.GLUniformData;
 import com.jogamp.opengl.awt.GLCanvas;
 import com.jogamp.opengl.glu.GLU;
+import com.jogamp.common.os.Clock;
 import com.jogamp.common.util.InterruptSource;
 import com.jogamp.newt.awt.NewtCanvasAWT;
 import com.jogamp.newt.opengl.GLWindow;
@@ -92,26 +93,29 @@ public class Bug735Inv1AppletAWT extends Applet implements Runnable {
   private int fcount = 0, lastm = 0;
   private final int fint = 1;
 
-  public void init() {
+  @Override
+public void init() {
     setSize(APPLET_WIDTH, APPLET_HEIGHT);
     setPreferredSize(new Dimension(APPLET_WIDTH, APPLET_HEIGHT));
     width = APPLET_WIDTH;
     height = APPLET_HEIGHT;
   }
 
-  public void start() {
+  @Override
+public void start() {
     thread = new InterruptSource.Thread(null, this, "Animation Thread");
     thread.start();
   }
 
-  public void run() {
+  @Override
+public void run() {
     int noDelays = 0;
     // Number of frames with a delay of 0 ms before the
     // animation thread yields to other running threads.
     final int NO_DELAYS_PER_YIELD = 15;
     final int TIMEOUT_SECONDS = 2;
 
-    long beforeTime = System.nanoTime();
+    long beforeTime = Clock.currentNanos();
     long overSleepTime = 0L;
 
     millisOffset = System.currentTimeMillis();
@@ -127,13 +131,14 @@ public class Bug735Inv1AppletAWT extends Applet implements Runnable {
 
       if (frameCount == 1) {
         EventQueue.invokeLater(new Runnable() {
-          public void run() {
+          @Override
+        public void run() {
             requestFocusInWindow();
           }
         });
       }
 
-      final long afterTime = System.nanoTime();
+      final long afterTime = Clock.currentNanos();
       final long timeDiff = afterTime - beforeTime;
       final long sleepTime = (frameRatePeriod - timeDiff) - overSleepTime;
       if (sleepTime > 0) {  // some time left in this cycle
@@ -141,7 +146,7 @@ public class Bug735Inv1AppletAWT extends Applet implements Runnable {
           Thread.sleep(sleepTime / 1000000L, (int) (sleepTime % 1000000L));
           noDelays = 0;  // Got some sleep, not delaying anymore
         } catch (final InterruptedException ex) { }
-        overSleepTime = (System.nanoTime() - afterTime) - sleepTime;
+        overSleepTime = (Clock.currentNanos() - afterTime) - sleepTime;
       } else {    // sleepTime <= 0; the frame took longer than the period
         overSleepTime = 0L;
         noDelays++;
@@ -150,7 +155,7 @@ public class Bug735Inv1AppletAWT extends Applet implements Runnable {
           noDelays = 0;
         }
       }
-      beforeTime = System.nanoTime();
+      beforeTime = Clock.currentNanos();
     }
   }
 
@@ -417,7 +422,8 @@ public class Bug735Inv1AppletAWT extends Applet implements Runnable {
 
     // This allows to close the frame.
     frame.addWindowListener(new WindowAdapter() {
-      public void windowClosing(final WindowEvent e) {
+      @Override
+    public void windowClosing(final WindowEvent e) {
         System.exit(0);
       }
     });
diff --git a/src/test/com/jogamp/opengl/test/bugs/Bug735Inv2AppletAWT.java b/src/test/com/jogamp/opengl/test/bugs/Bug735Inv2AppletAWT.java
index d0e4448cc..31ff4193c 100644
--- a/src/test/com/jogamp/opengl/test/bugs/Bug735Inv2AppletAWT.java
+++ b/src/test/com/jogamp/opengl/test/bugs/Bug735Inv2AppletAWT.java
@@ -20,6 +20,7 @@ import com.jogamp.opengl.GLCapabilities;
 import com.jogamp.opengl.GLEventListener;
 import com.jogamp.opengl.GLProfile;
 import com.jogamp.opengl.awt.GLCanvas;
+import com.jogamp.common.os.Clock;
 import com.jogamp.common.util.InterruptSource;
 import com.jogamp.junit.util.JunitTracer;
 import com.jogamp.newt.awt.NewtCanvasAWT;
@@ -73,7 +74,8 @@ public class Bug735Inv2AppletAWT extends Applet implements Runnable {
   private final long frameRatePeriod = 1000000000L / TARGET_FPS;
   private int frameCount;
 
-  public void init() {
+  @Override
+public void init() {
     setSize(APPLET_WIDTH, APPLET_HEIGHT);
     setPreferredSize(new Dimension(APPLET_WIDTH, APPLET_HEIGHT));
     width = APPLET_WIDTH;
@@ -81,27 +83,30 @@ public class Bug735Inv2AppletAWT extends Applet implements Runnable {
     initGL();
   }
 
-  public void start() {
+  @Override
+public void start() {
     initDraw();
     thread = new InterruptSource.Thread(null, this, "Animation Thread");
     thread.start();
   }
 
-  public void run() {
+  @Override
+public void run() {
     int noDelays = 0;
     // Number of frames with a delay of 0 ms before the
     // animation thread yields to other running threads.
     final int NO_DELAYS_PER_YIELD = 15;
     final int TIMEOUT_SECONDS = 2;
 
-    long beforeTime = System.nanoTime();
+    long beforeTime = Clock.currentNanos();
     long overSleepTime = 0L;
 
     frameCount = 1;
     while (Thread.currentThread() == thread) {
       if (frameCount == 1) {
         EventQueue.invokeLater(new Runnable() {
-          public void run() {
+          @Override
+        public void run() {
             requestFocusInWindow();
           }
         });
@@ -117,7 +122,7 @@ public class Bug735Inv2AppletAWT extends Applet implements Runnable {
         e.printStackTrace();
       }
 
-      final long afterTime = System.nanoTime();
+      final long afterTime = Clock.currentNanos();
       final long timeDiff = afterTime - beforeTime;
       final long sleepTime = (frameRatePeriod - timeDiff) - overSleepTime;
       if (sleepTime > 0) {  // some time left in this cycle
@@ -125,7 +130,7 @@ public class Bug735Inv2AppletAWT extends Applet implements Runnable {
           Thread.sleep(sleepTime / 1000000L, (int) (sleepTime % 1000000L));
           noDelays = 0;  // Got some sleep, not delaying anymore
         } catch (final InterruptedException ex) { }
-        overSleepTime = (System.nanoTime() - afterTime) - sleepTime;
+        overSleepTime = (Clock.currentNanos() - afterTime) - sleepTime;
       } else {    // sleepTime <= 0; the frame took longer than the period
         overSleepTime = 0L;
         noDelays++;
@@ -134,7 +139,7 @@ public class Bug735Inv2AppletAWT extends Applet implements Runnable {
           noDelays = 0;
         }
       }
-      beforeTime = System.nanoTime();
+      beforeTime = Clock.currentNanos();
     }
   }
 
@@ -262,7 +267,8 @@ public class Bug735Inv2AppletAWT extends Applet implements Runnable {
 
     // This allows to close the frame.
     frame.addWindowListener(new WindowAdapter() {
-      public void windowClosing(final WindowEvent e) {
+      @Override
+    public void windowClosing(final WindowEvent e) {
         System.exit(0);
       }
     });
diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/awt/TestGLCanvasAWTActionDeadlock02AWT.java b/src/test/com/jogamp/opengl/test/junit/jogl/awt/TestGLCanvasAWTActionDeadlock02AWT.java
index 58a7a72c1..35970bc1e 100644
--- a/src/test/com/jogamp/opengl/test/junit/jogl/awt/TestGLCanvasAWTActionDeadlock02AWT.java
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/awt/TestGLCanvasAWTActionDeadlock02AWT.java
@@ -55,6 +55,7 @@ import org.junit.Test;
 import org.junit.FixMethodOrder;
 import org.junit.runners.MethodSorters;
 
+import com.jogamp.common.os.Clock;
 import com.jogamp.common.os.Platform;
 import com.jogamp.common.util.VersionNumber;
 import com.jogamp.common.util.awt.AWTEDTExecutor;
@@ -216,12 +217,14 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
         }
         // All AWT Mods on AWT-EDT, especially due to the follow-up complicated code!
         AWTEDTExecutor.singleton.invoke(true, new Runnable() {
+            @Override
             public void run() {
                 frame.setTitle("MiniPApplet");
             } } );
         if (fullScreen) {
             try {
                 javax.swing.SwingUtilities.invokeAndWait(new Runnable() {
+                    @Override
                     public void run() {
                         frame.setUndecorated(true);
                         frame.setBackground(Color.GRAY);
@@ -235,6 +238,7 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
         }
         try {
             javax.swing.SwingUtilities.invokeAndWait(new Runnable() {
+                @Override
                 public void run() {
                     frame.setLayout(null);
                     frame.add(applet);
@@ -273,7 +277,8 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
 
         frame.add(this);
         frame.addWindowListener(new WindowAdapter() {
-          public void windowClosing(final WindowEvent e) {
+          @Override
+        public void windowClosing(final WindowEvent e) {
               try {
                   dispose();
               } catch (final Exception ex) {
@@ -283,6 +288,7 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
         });
 
         javax.swing.SwingUtilities.invokeAndWait(new Runnable() {
+            @Override
             public void run() {
                 frame.setVisible(true);
             } } );
@@ -301,6 +307,7 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
         canvas.setBounds(0, 0, width, height);
 
         javax.swing.SwingUtilities.invokeAndWait(new Runnable() {
+            @Override
             public void run() {
                 MiniPApplet.this.setLayout(new BorderLayout());
                 MiniPApplet.this.add(canvas, BorderLayout.CENTER);
@@ -339,6 +346,7 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
 
         // Setting up animation again
         javax.swing.SwingUtilities.invokeAndWait(new Runnable() {
+            @Override
             public void run() {
                 MiniPApplet.this.setLayout(new BorderLayout());
                 MiniPApplet.this.add(canvas, BorderLayout.CENTER);
@@ -378,6 +386,7 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
             frame = null;
         } else {
             javax.swing.SwingUtilities.invokeAndWait(new Runnable() {
+                @Override
                 public void run() {
                     MiniPApplet.this.remove(canvas);
                     frame.remove(MiniPApplet.this);
@@ -391,6 +400,7 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
       void draw(final GL2 gl) {
         if( !osxCALayerAWTModBug || !justInitialized ) {
             AWTEDTExecutor.singleton.invoke(true, new Runnable() {
+                @Override
                 public void run() {
                     frame.setTitle("frame " + frameCount);
                 } } );
@@ -409,7 +419,7 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
           System.out.println(OPENGL_EXTENSIONS);
 
           final int[] temp = { 0 };
-          gl.glGetIntegerv(GL2ES3.GL_MAX_SAMPLES, temp, 0);
+          gl.glGetIntegerv(GL.GL_MAX_SAMPLES, temp, 0);
           System.out.println("Maximum number of samples supported by the hardware: " + temp[0]);
           System.out.println("Frame: "+frame);
           System.out.println("Applet: "+MiniPApplet.this);
@@ -475,7 +485,7 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
       }
 
       void clock() {
-        final long afterTime = System.nanoTime();
+        final long afterTime = Clock.currentNanos();
         final long timeDiff = afterTime - beforeTime;
         final long sleepTime = (frameRatePeriod - timeDiff) - overSleepTime;
 
@@ -484,13 +494,13 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
             Thread.sleep(sleepTime / 1000000L, (int) (sleepTime % 1000000L));
           } catch (final InterruptedException ex) { }
 
-          overSleepTime = (System.nanoTime() - afterTime) - sleepTime;
+          overSleepTime = (Clock.currentNanos() - afterTime) - sleepTime;
 
         } else {    // sleepTime <= 0; the frame took longer than the period
           overSleepTime = 0L;
         }
 
-        beforeTime = System.nanoTime();
+        beforeTime = Clock.currentNanos();
       }
 
       class SimpleListener implements GLEventListener {
@@ -512,31 +522,36 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
         public void reshape(final GLAutoDrawable drawable, final int x, final int y, final int w, final int h) { }
       }
 
-      public void mouseDragged(final MouseEvent ev) {
+      @Override
+    public void mouseDragged(final MouseEvent ev) {
         if (printEventInfo) {
           System.err.println("Mouse dragged event: " + ev);
         }
       }
 
-      public void mouseMoved(final MouseEvent ev) {
+      @Override
+    public void mouseMoved(final MouseEvent ev) {
         if (printEventInfo) {
           System.err.println("Mouse moved event: " + ev);
         }
       }
 
-      public void keyPressed(final KeyEvent ev) {
+      @Override
+    public void keyPressed(final KeyEvent ev) {
         if (printEventInfo) {
           System.err.println("Key pressed event: " + ev);
         }
       }
 
-      public void keyReleased(final KeyEvent ev) {
+      @Override
+    public void keyReleased(final KeyEvent ev) {
         if (printEventInfo) {
           System.err.println("Key released event: " + ev);
         }
       }
 
-      public void keyTyped(final KeyEvent ev) {
+      @Override
+    public void keyTyped(final KeyEvent ev) {
         if (printEventInfo) {
           System.err.println("Key typed event: " + ev);
         }
@@ -550,7 +565,8 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
           private TimerTask task = null;
           private volatile boolean shouldRun;
 
-          protected String getBaseName(final String prefix) {
+          @Override
+        protected String getBaseName(final String prefix) {
               return "Custom" + prefix + "Animator" ;
           }
 
@@ -566,11 +582,13 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
               shouldRun = true;
           }
 
-          public final synchronized boolean isStarted() {
+          @Override
+        public final synchronized boolean isStarted() {
               return (timer != null);
           }
 
-          public final synchronized boolean isAnimating() {
+          @Override
+        public final synchronized boolean isAnimating() {
               return (timer != null) && (task != null);
           }
 
@@ -581,7 +599,8 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
 
               task = new TimerTask() {
                   private boolean firstRun = true;
-                  public void run() {
+                  @Override
+                public void run() {
                       if (firstRun) {
                         Thread.currentThread().setName("OPENGL");
                         firstRun = false;
@@ -604,7 +623,8 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
               timer.schedule(task, 0, 1);
           }
 
-          public synchronized boolean  start() {
+          @Override
+        public synchronized boolean  start() {
               if (timer != null) {
                   return false;
               }
@@ -614,7 +634,8 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
           }
 
           /** Stops this CustomAnimator. */
-          public synchronized boolean stop() {
+          @Override
+        public synchronized boolean stop() {
               if (timer == null) {
                   return false;
               }
@@ -634,9 +655,12 @@ public class TestGLCanvasAWTActionDeadlock02AWT extends UITestCase {
               return true;
           }
 
-          public final synchronized boolean isPaused() { return false; }
-          public synchronized boolean resume() { return false; }
-          public synchronized boolean pause() { return false; }
+          @Override
+        public final synchronized boolean isPaused() { return false; }
+          @Override
+        public synchronized boolean resume() { return false; }
+          @Override
+        public synchronized boolean pause() { return false; }
       }
   }
 
diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/demos/es2/ElektronenMultiplizierer.java b/src/test/com/jogamp/opengl/test/junit/jogl/demos/es2/ElektronenMultiplizierer.java
index 1956e6fb7..88e51db8b 100644
--- a/src/test/com/jogamp/opengl/test/junit/jogl/demos/es2/ElektronenMultiplizierer.java
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/demos/es2/ElektronenMultiplizierer.java
@@ -43,6 +43,7 @@ import com.jogamp.opengl.GLUniformData;
 import com.jogamp.opengl.fixedfunc.GLMatrixFunc;
 
 import com.jogamp.common.nio.Buffers;
+import com.jogamp.common.os.Clock;
 import com.jogamp.newt.event.KeyAdapter;
 import com.jogamp.newt.event.KeyEvent;
 import com.jogamp.newt.opengl.GLWindow;
@@ -158,6 +159,7 @@ public class ElektronenMultiplizierer implements GLEventListener {
     public boolean  usesFullScreenMode()            { return mUsesFullScreenMode; }
 
     class TimeShiftKeys extends KeyAdapter {
+        @Override
         public void keyPressed(final KeyEvent e) {
             if(KeyEvent.VK_RIGHT == e.getKeyCode()) {
                 skipFrames(120);
@@ -223,6 +225,7 @@ public class ElektronenMultiplizierer implements GLEventListener {
         return mCaps;
     }
 
+    @Override
     public void init(final GLAutoDrawable drawable) {
         if(drawable instanceof GLWindow) {
             final GLWindow glw = (GLWindow) drawable;
@@ -308,16 +311,17 @@ public class ElektronenMultiplizierer implements GLEventListener {
 
         // if NO music is used sync to mainloop start ...
         // (add up current time due to possible turned back start time by skip frames)
-        mFrameSkipAverageFramerateTimeStart += System.nanoTime();
+        mFrameSkipAverageFramerateTimeStart += Clock.currentNanos();
 
 //        mBaseMusic = new BaseMusic(BaseGlobalEnvironment.getInstance().getMusicFileName());
 //        mBaseMusic.init();
 //        mBaseMusic.play();
     }
 
+    @Override
     public void display(final GLAutoDrawable drawable) {
         if (wantsFrameSkip()) {
-            mFrameSkipAverageFramerateTimeEnd = System.nanoTime();
+            mFrameSkipAverageFramerateTimeEnd = Clock.currentNanos();
             final double tDesiredFrameRate = getDesiredFramerate();
             final double tSingleFrameTime = 1000000000.0f/tDesiredFrameRate;
             final double tElapsedTime = mFrameSkipAverageFramerateTimeEnd - mFrameSkipAverageFramerateTimeStart;
@@ -342,7 +346,7 @@ public class ElektronenMultiplizierer implements GLEventListener {
 //            //if music IS used sync to first second of music ...
 //            if (BaseRoutineRuntime.getInstance().getBaseMusic().getPositionInMilliseconds()>0 && !mMusicSyncStartTimeInitialized) {
 //                BaseLogging.getInstance().info("Synching to BaseMusic ...");
-//                mFrameSkipAverageFramerateTimeStart = (long)(System.nanoTime()-((double)BaseRoutineRuntime.getInstance().getBaseMusic().getPositionInMilliseconds()*1000000.0d));
+//                mFrameSkipAverageFramerateTimeStart = (long)(Clock.currentNanos()-((double)BaseRoutineRuntime.getInstance().getBaseMusic().getPositionInMilliseconds()*1000000.0d));
 //                mMusicSyncStartTimeInitialized = true;
 //            }
 //        }
@@ -470,6 +474,7 @@ public class ElektronenMultiplizierer implements GLEventListener {
         mFrameCounter++;
     }
 
+    @Override
     public void reshape(final GLAutoDrawable drawable, final int x, final int y, final int width, final int height) {
         final GL2ES2 gl = drawable.getGL().getGL2ES2();
 
@@ -493,6 +498,7 @@ public class ElektronenMultiplizierer implements GLEventListener {
         gl.glViewport(0, 0, width, height);
     }
 
+    @Override
     public void dispose(final GLAutoDrawable drawable) {
         final GL2ES2 gl = drawable.getGL().getGL2ES2();
         gl.glDeleteFramebuffers(1, new int[] { mFrameBufferObjectID }, 0);