Exemple #1
0
/**
 * NEWT Utility class MainThread
 *
 * <p>This class provides a startup singleton <i>main thread</i>, from which a new thread with the
 * users main class is launched.<br>
 * Such behavior is necessary for native windowing toolkits, where the windowing management must
 * happen on the so called <i>main thread</i> e.g. for Mac OS X !<br>
 * Utilizing this class as a launchpad, now you are able to use a NEWT multithreaded application
 * with window handling within the different threads, even on these restricted platforms.<br>
 * To support your NEWT Window platform, you have to pass your <i>main thread</i> actions to {@link
 * #invoke invoke(..)}, have a look at the {@link com.jogamp.newt.macosx.MacWindow MacWindow}
 * implementation.<br>
 * <i>TODO</i>: Some hardcoded dependencies exist in this implementation, where you have to patch
 * this code or factor it out.
 *
 * <p>If your platform is not Mac OS X, but you want to test your code without modifying this class,
 * you have to set the system property <code>newt.MainThread.force</code> to <code>true</code>.
 *
 * <p>The code is compatible with all other platform, which support multithreaded windowing
 * handling. Since those platforms won't trigger the <i>main thread</i> serialization, the main
 * method will be simply executed, in case you haven't set <code>newt.MainThread.force</code> to
 * <code>true</code>.
 *
 * <p>Test case on Mac OS X (or any other platform):
 *
 * <PRE>
 * java -XstartOnFirstThread com.jogamp.newt.util.MainThread demos.es1.RedSquare -GL2 -GL2 -GL2 -GL2
 * </PRE>
 *
 * Which starts 4 threads, each with a window and OpenGL rendering.<br>
 */
public class MainThread implements EDTUtil {
  private static AccessControlContext localACC = AccessController.getContext();
  public static final boolean MAIN_THREAD_CRITERIA =
      (!NativeWindowFactory.isAWTAvailable()
              && NativeWindowFactory.TYPE_MACOSX.equals(
                  NativeWindowFactory.getNativeWindowType(false)))
          || Debug.getBooleanProperty("newt.MainThread.force", true, localACC);

  protected static final boolean DEBUG = Debug.debug("MainThread");

  private static MainThread singletonMainThread = new MainThread(); // one singleton MainThread

  private static boolean isExit = false;
  private static volatile boolean isRunning = false;
  private static Object taskWorkerLock = new Object();
  private static boolean shouldStop;
  private static ArrayList tasks;
  private static Thread mainThread;

  private static Timer pumpMessagesTimer = null;
  private static TimerTask pumpMessagesTimerTask = null;
  private static Map /*<Display, Runnable>*/ pumpMessageDisplayMap = new HashMap();

  private static boolean useMainThread = false;
  private static Class cAWTEventQueue = null;
  private static Method mAWTInvokeAndWait = null;
  private static Method mAWTInvokeLater = null;
  private static Method mAWTIsDispatchThread = null;

  static class MainAction extends Thread {
    private String mainClassName;
    private String[] mainClassArgs;

    private Class mainClass;
    private Method mainClassMain;

    public MainAction(String mainClassName, String[] mainClassArgs) {
      this.mainClassName = mainClassName;
      this.mainClassArgs = mainClassArgs;
    }

    public void run() {
      if (useMainThread) {
        // we have to start first to provide the service ..
        singletonMainThread.waitUntilRunning();
      }

      // start user app ..
      try {
        Class mainClass = ReflectionUtil.getClass(mainClassName, true, getClass().getClassLoader());
        if (null == mainClass) {
          throw new RuntimeException(
              new ClassNotFoundException("MainThread couldn't find main class " + mainClassName));
        }
        try {
          mainClassMain = mainClass.getDeclaredMethod("main", new Class[] {String[].class});
          mainClassMain.setAccessible(true);
        } catch (Throwable t) {
          throw new RuntimeException(t);
        }
        if (DEBUG)
          System.err.println(
              "MainAction.run(): " + Thread.currentThread().getName() + " invoke " + mainClassName);
        mainClassMain.invoke(null, new Object[] {mainClassArgs});
      } catch (InvocationTargetException ite) {
        ite.getTargetException().printStackTrace();
      } catch (Throwable t) {
        t.printStackTrace();
      }

      if (DEBUG)
        System.err.println(
            "MainAction.run(): " + Thread.currentThread().getName() + " user app fin");

      if (useMainThread) {
        singletonMainThread.stop();
        if (DEBUG)
          System.err.println(
              "MainAction.run(): " + Thread.currentThread().getName() + " MainThread fin - stop");
        System.exit(0);
      }
    }
  }

  private static MainAction mainAction;

  /** Your new java application main entry, which pipelines your application */
  public static void main(String[] args) {
    useMainThread = MAIN_THREAD_CRITERIA;

    if (DEBUG)
      System.err.println(
          "MainThread.main(): "
              + Thread.currentThread().getName()
              + " useMainThread "
              + useMainThread);

    if (args.length == 0) {
      return;
    }

    String mainClassName = args[0];
    String[] mainClassArgs = new String[args.length - 1];
    if (args.length > 1) {
      System.arraycopy(args, 1, mainClassArgs, 0, args.length - 1);
    }

    NEWTJNILibLoader.loadNEWT();

    mainAction = new MainAction(mainClassName, mainClassArgs);

    if (NativeWindowFactory.TYPE_MACOSX.equals(NativeWindowFactory.getNativeWindowType(false))) {
      ReflectionUtil.callStaticMethod(
          "com.jogamp.newt.impl.macosx.MacDisplay",
          "initSingleton",
          null,
          null,
          MainThread.class.getClassLoader());
    }

    if (useMainThread) {
      shouldStop = false;
      tasks = new ArrayList();
      mainThread = Thread.currentThread();

      // dispatch user's main thread ..
      mainAction.start();

      // do our main thread task scheduling
      singletonMainThread.run();
    } else {
      // run user's main in this thread
      mainAction.run();
    }
  }

  public static final MainThread getSingleton() {
    return singletonMainThread;
  }

  public static Runnable removePumpMessage(Display dpy) {
    synchronized (pumpMessageDisplayMap) {
      return (Runnable) pumpMessageDisplayMap.remove(dpy);
    }
  }

  public static void addPumpMessage(Display dpy, Runnable pumpMessage) {
    if (useMainThread) {
      return; // error ?
    }
    if (null == pumpMessagesTimer) {
      synchronized (MainThread.class) {
        if (null == pumpMessagesTimer) {
          pumpMessagesTimer = new Timer();
          pumpMessagesTimerTask =
              new TimerTask() {
                public void run() {
                  synchronized (pumpMessageDisplayMap) {
                    for (Iterator i = pumpMessageDisplayMap.values().iterator(); i.hasNext(); ) {
                      ((Runnable) i.next()).run();
                    }
                  }
                }
              };
          pumpMessagesTimer.scheduleAtFixedRate(
              pumpMessagesTimerTask, 0, defaultEDTPollGranularity);
        }
      }
    }
    synchronized (pumpMessageDisplayMap) {
      pumpMessageDisplayMap.put(dpy, pumpMessage);
    }
  }

  private void initAWTReflection() {
    if (null == cAWTEventQueue) {
      ClassLoader cl = MainThread.class.getClassLoader();
      cAWTEventQueue = ReflectionUtil.getClass("java.awt.EventQueue", true, cl);
      mAWTInvokeAndWait =
          ReflectionUtil.getMethod(
              cAWTEventQueue, "invokeAndWait", new Class[] {java.lang.Runnable.class}, cl);
      mAWTInvokeLater =
          ReflectionUtil.getMethod(
              cAWTEventQueue, "invokeLater", new Class[] {java.lang.Runnable.class}, cl);
      mAWTIsDispatchThread =
          ReflectionUtil.getMethod(cAWTEventQueue, "isDispatchThread", new Class[] {}, cl);
    }
  }

  public void start() {
    // nop
  }

  public void stop() {
    if (DEBUG)
      System.err.println("MainThread.stop(): " + Thread.currentThread().getName() + " start");
    synchronized (taskWorkerLock) {
      if (isRunning) {
        shouldStop = true;
      }
      taskWorkerLock.notifyAll();
    }
    if (DEBUG)
      System.err.println("MainThread.stop(): " + Thread.currentThread().getName() + " end");
  }

  public boolean isCurrentThreadEDT() {
    if (NativeWindowFactory.isAWTAvailable()) {
      initAWTReflection();
      return ((Boolean) ReflectionUtil.callMethod(null, mAWTIsDispatchThread, null)).booleanValue();
    }
    return isRunning() && mainThread == Thread.currentThread();
  }

  public boolean isRunning() {
    if (useMainThread) {
      synchronized (taskWorkerLock) {
        return isRunning;
      }
    }
    return true; // AWT is always running
  }

  private void invokeLater(Runnable task) {
    synchronized (taskWorkerLock) {
      if (isRunning() && mainThread != Thread.currentThread()) {
        tasks.add(task);
        taskWorkerLock.notifyAll();
      } else {
        // if !running or isEDTThread, do it right away
        task.run();
      }
    }
  }

  /** invokes the given Runnable */
  public void invoke(boolean wait, Runnable r) {
    if (r == null) {
      return;
    }

    if (NativeWindowFactory.isAWTAvailable()) {
      initAWTReflection();

      // handover to AWT MainThread ..
      try {
        if (((Boolean) ReflectionUtil.callMethod(null, mAWTIsDispatchThread, null))
            .booleanValue()) {
          r.run();
          return;
        }
        if (wait) {
          ReflectionUtil.callMethod(null, mAWTInvokeAndWait, new Object[] {r});
        } else {
          ReflectionUtil.callMethod(null, mAWTInvokeLater, new Object[] {r});
        }
      } catch (Exception e) {
        throw new NativeWindowException(e);
      }
      return;
    }

    // if this main thread is not being used or
    // if this is already the main thread .. just execute.
    if (!isRunning() || mainThread == Thread.currentThread()) {
      r.run();
      return;
    }

    boolean doWait = wait && isRunning() && mainThread != Thread.currentThread();
    Object lock = new Object();
    RunnableTask rTask = new RunnableTask(r, doWait ? lock : null, true);
    Throwable throwable = null;
    synchronized (lock) {
      invokeLater(rTask);
      if (doWait) {
        try {
          lock.wait();
        } catch (InterruptedException ie) {
          throwable = ie;
        }
      }
    }
    if (null == throwable) {
      throwable = rTask.getThrowable();
    }
    if (null != throwable) {
      throw new RuntimeException(throwable);
    }
  }

  public void waitUntilIdle() {}

  public void waitUntilStopped() {}

  private void waitUntilRunning() {
    synchronized (taskWorkerLock) {
      if (isExit) return;

      while (!isRunning) {
        try {
          taskWorkerLock.wait();
        } catch (InterruptedException e) {
          e.printStackTrace();
        }
      }
    }
  }

  public void run() {
    if (DEBUG) System.err.println("MainThread.run(): " + Thread.currentThread().getName());
    synchronized (taskWorkerLock) {
      isRunning = true;
      taskWorkerLock.notifyAll();
    }
    while (!shouldStop) {
      try {
        // wait for something todo ..
        synchronized (taskWorkerLock) {
          while (!shouldStop && tasks.size() == 0) {
            try {
              taskWorkerLock.wait();
            } catch (InterruptedException e) {
              e.printStackTrace();
            }
          }

          // take over the tasks ..
          if (!shouldStop && tasks.size() > 0) {
            Runnable task = (Runnable) tasks.remove(0);
            task.run(); // FIXME: could be run outside of lock
          }
          taskWorkerLock.notifyAll();
        }
      } catch (Throwable t) {
        // handle errors ..
        t.printStackTrace();
      } finally {
        // epilog - unlock locked stuff
      }
    }
    if (DEBUG) System.err.println("MainThread.run(): " + Thread.currentThread().getName() + " fin");
    synchronized (taskWorkerLock) {
      isRunning = false;
      isExit = true;
      taskWorkerLock.notifyAll();
    }
  }
}
/**
 * Subclass of GraphicsConfigurationFactory used when non-AWT tookits are used on X11 platforms.
 * Toolkits will likely need to delegate to this one to change the accepted and returned types of
 * the GraphicsDevice and GraphicsConfiguration abstractions.
 */
public class X11GLXGraphicsConfigurationFactory extends GraphicsConfigurationFactory {
  protected static final boolean DEBUG = Debug.debug("GraphicsConfiguration");

  public X11GLXGraphicsConfigurationFactory() {
    GraphicsConfigurationFactory.registerFactory(
        javax.media.nativewindow.x11.X11GraphicsDevice.class, this);
  }

  public AbstractGraphicsConfiguration chooseGraphicsConfiguration(
      Capabilities capabilities, CapabilitiesChooser chooser, AbstractGraphicsScreen absScreen) {
    return chooseGraphicsConfigurationStatic(capabilities, chooser, absScreen);
  }

  protected static X11GLXGraphicsConfiguration createDefaultGraphicsConfiguration(
      AbstractGraphicsScreen absScreen, boolean onscreen, boolean usePBuffer) {
    if (absScreen == null) {
      throw new IllegalArgumentException("AbstractGraphicsScreen is null");
    }
    if (!(absScreen instanceof X11GraphicsScreen)) {
      throw new IllegalArgumentException("Only X11GraphicsScreen are allowed here");
    }
    X11GraphicsScreen x11Screen = (X11GraphicsScreen) absScreen;

    GLProfile glProfile = GLProfile.getDefault();
    GLCapabilities caps = null;
    XVisualInfo xvis = null;
    long fbcfg = 0;
    int fbid = -1;

    // Utilizing FBConfig
    //
    GLCapabilities capsFB = null;
    long display = x11Screen.getDevice().getHandle();
    try {
      NativeWindowFactory.getDefaultFactory().getToolkitLock().lock();
      X11Lib.XLockDisplay(display);
      int screen = x11Screen.getIndex();
      boolean isMultisampleAvailable = GLXUtil.isMultisampleAvailable(display);

      long visID = X11Lib.DefaultVisualID(display, x11Screen.getIndex());
      xvis = X11GLXGraphicsConfiguration.XVisualID2XVisualInfo(display, visID);
      caps =
          X11GLXGraphicsConfiguration.XVisualInfo2GLCapabilities(
              glProfile, display, xvis, onscreen, usePBuffer, isMultisampleAvailable);

      int[] attribs =
          X11GLXGraphicsConfiguration.GLCapabilities2AttribList(
              caps, true, isMultisampleAvailable, display, screen);
      int[] count = {-1};
      PointerBuffer fbcfgsL = GLX.glXChooseFBConfigCopied(display, screen, attribs, 0, count, 0);
      if (fbcfgsL == null || fbcfgsL.limit() < 1) {
        throw new Exception("Could not fetch FBConfig for " + caps);
      }
      fbcfg = fbcfgsL.get(0);
      capsFB =
          X11GLXGraphicsConfiguration.GLXFBConfig2GLCapabilities(
              glProfile, display, fbcfg, true, onscreen, usePBuffer, isMultisampleAvailable);

      fbid = X11GLXGraphicsConfiguration.glXFBConfig2FBConfigID(display, fbcfg);

      xvis = GLX.glXGetVisualFromFBConfigCopied(display, fbcfg);
      if (xvis == null) {
        throw new GLException("Error: Choosen FBConfig has no visual");
      }
    } catch (Throwable t) {
    } finally {
      X11Lib.XUnlockDisplay(display);
      NativeWindowFactory.getDefaultFactory().getToolkitLock().unlock();
    }

    return new X11GLXGraphicsConfiguration(
        x11Screen, (null != capsFB) ? capsFB : caps, caps, null, xvis, fbcfg, fbid);
  }

  protected static X11GLXGraphicsConfiguration chooseGraphicsConfigurationStatic(
      Capabilities capabilities, CapabilitiesChooser chooser, AbstractGraphicsScreen absScreen) {
    if (absScreen == null) {
      throw new IllegalArgumentException("AbstractGraphicsScreen is null");
    }
    if (!(absScreen instanceof X11GraphicsScreen)) {
      throw new IllegalArgumentException("Only X11GraphicsScreen are allowed here");
    }
    X11GraphicsScreen x11Screen = (X11GraphicsScreen) absScreen;

    if (capabilities != null && !(capabilities instanceof GLCapabilities)) {
      throw new IllegalArgumentException(
          "This NativeWindowFactory accepts only GLCapabilities objects");
    }

    if (chooser != null && !(chooser instanceof GLCapabilitiesChooser)) {
      throw new IllegalArgumentException(
          "This NativeWindowFactory accepts only GLCapabilitiesChooser objects");
    }

    if (capabilities == null) {
      capabilities = new GLCapabilities(null);
    }

    boolean onscreen = capabilities.isOnscreen();
    boolean usePBuffer = ((GLCapabilities) capabilities).isPBuffer();

    GLCapabilities caps2 = (GLCapabilities) capabilities.clone();
    if (!caps2.isOnscreen()) {
      // OFFSCREEN !DOUBLE_BUFFER // FIXME DBLBUFOFFSCRN
      caps2.setDoubleBuffered(false);
    }

    X11GLXGraphicsConfiguration res;
    res =
        chooseGraphicsConfigurationFBConfig(
            (GLCapabilities) caps2, (GLCapabilitiesChooser) chooser, x11Screen);
    if (null == res) {
      if (usePBuffer) {
        throw new GLException(
            "Error: Couldn't create X11GLXGraphicsConfiguration based on FBConfig");
      }
      res =
          chooseGraphicsConfigurationXVisual(
              (GLCapabilities) caps2, (GLCapabilitiesChooser) chooser, x11Screen);
    }
    if (null == res) {
      throw new GLException("Error: Couldn't create X11GLXGraphicsConfiguration");
    }
    if (DEBUG) {
      System.err.println(
          "X11GLXGraphicsConfiguration.chooseGraphicsConfigurationStatic("
              + x11Screen
              + ","
              + caps2
              + "): "
              + res);
    }
    return res;
  }

  protected static X11GLXGraphicsConfiguration chooseGraphicsConfigurationFBConfig(
      GLCapabilities capabilities, GLCapabilitiesChooser chooser, X11GraphicsScreen x11Screen) {
    int recommendedIndex = -1;
    GLCapabilities[] caps = null;
    PointerBuffer fbcfgsL = null;
    int chosen = -1;
    int retFBID = -1;
    XVisualInfo retXVisualInfo = null;
    GLProfile glProfile = capabilities.getGLProfile();
    boolean onscreen = capabilities.isOnscreen();
    boolean usePBuffer = capabilities.isPBuffer();

    // Utilizing FBConfig
    //
    AbstractGraphicsDevice absDevice = x11Screen.getDevice();
    long display = absDevice.getHandle();
    try {
      NativeWindowFactory.getDefaultFactory().getToolkitLock().lock();
      X11Lib.XLockDisplay(display);
      int screen = x11Screen.getIndex();
      boolean isMultisampleAvailable = GLXUtil.isMultisampleAvailable(display);
      int[] attribs =
          X11GLXGraphicsConfiguration.GLCapabilities2AttribList(
              capabilities, true, isMultisampleAvailable, display, screen);
      int[] count = {-1};

      fbcfgsL = GLX.glXChooseFBConfigCopied(display, screen, attribs, 0, count, 0);
      if (fbcfgsL == null || fbcfgsL.limit() < 1) {
        if (DEBUG) {
          System.err.println(
              "X11GLXGraphicsConfiguration.chooseGraphicsConfigurationFBConfig: Failed glXChooseFBConfig ("
                  + x11Screen
                  + ","
                  + capabilities
                  + "): "
                  + fbcfgsL
                  + ", "
                  + count[0]);
        }
        return null;
      }
      if (!X11GLXGraphicsConfiguration.GLXFBConfigValid(display, fbcfgsL.get(0))) {
        if (DEBUG) {
          System.err.println(
              "X11GLXGraphicsConfiguration.chooseGraphicsConfigurationFBConfig: Failed - GLX FBConfig invalid: ("
                  + x11Screen
                  + ","
                  + capabilities
                  + "): "
                  + fbcfgsL
                  + ", fbcfg: 0x"
                  + Long.toHexString(fbcfgsL.get(0)));
        }
        return null;
      }
      recommendedIndex = 0; // 1st match is always recommended ..
      caps = new GLCapabilities[fbcfgsL.limit()];
      for (int i = 0; i < fbcfgsL.limit(); i++) {
        caps[i] =
            X11GLXGraphicsConfiguration.GLXFBConfig2GLCapabilities(
                glProfile,
                display,
                fbcfgsL.get(i),
                false,
                onscreen,
                usePBuffer,
                isMultisampleAvailable);
      }

      if (null == chooser) {
        chosen = recommendedIndex;
      } else {
        try {
          chosen = chooser.chooseCapabilities(capabilities, caps, recommendedIndex);
        } catch (NativeWindowException e) {
          if (DEBUG) {
            e.printStackTrace();
          }
          chosen = -1;
        }
      }
      if (chosen < 0) {
        // keep on going ..
        if (DEBUG) {
          System.err.println(
              "X11GLXGraphicsConfiguration.chooseGraphicsConfigurationFBConfig Failed .. unable to choose config, using first");
        }
        chosen = 0; // default ..
      } else if (chosen >= caps.length) {
        throw new GLException(
            "GLCapabilitiesChooser specified invalid index (expected 0.."
                + (caps.length - 1)
                + ")");
      }

      retFBID = X11GLXGraphicsConfiguration.glXFBConfig2FBConfigID(display, fbcfgsL.get(chosen));

      retXVisualInfo = GLX.glXGetVisualFromFBConfigCopied(display, fbcfgsL.get(chosen));
      if (retXVisualInfo == null) {
        if (DEBUG) {
          System.err.println(
              "X11GLXGraphicsConfiguration.chooseGraphicsConfigurationFBConfig: Failed glXGetVisualFromFBConfig ("
                  + x11Screen
                  + ", "
                  + fbcfgsL.get(chosen)
                  + " (Continue: "
                  + (false == caps[chosen].isOnscreen())
                  + "):\n\t"
                  + caps[chosen]);
        }
        if (caps[chosen].isOnscreen()) {
          // Onscreen drawables shall have a XVisual ..
          return null;
        }
      }
    } finally {
      X11Lib.XUnlockDisplay(display);
      NativeWindowFactory.getDefaultFactory().getToolkitLock().unlock();
    }

    return new X11GLXGraphicsConfiguration(
        x11Screen,
        caps[chosen],
        capabilities,
        chooser,
        retXVisualInfo,
        fbcfgsL.get(chosen),
        retFBID);
  }

  protected static X11GLXGraphicsConfiguration chooseGraphicsConfigurationXVisual(
      GLCapabilities capabilities, GLCapabilitiesChooser chooser, X11GraphicsScreen x11Screen) {
    if (chooser == null) {
      chooser = new DefaultGLCapabilitiesChooser();
    }

    // Until we have a rock-solid visual selection algorithm written
    // in pure Java, we're going to provide the underlying window
    // system's selection to the chooser as a hint

    GLProfile glProfile = capabilities.getGLProfile();
    boolean onscreen = capabilities.isOnscreen();
    GLCapabilities[] caps = null;
    int recommendedIndex = -1;
    XVisualInfo retXVisualInfo = null;
    int chosen = -1;

    AbstractGraphicsDevice absDevice = x11Screen.getDevice();
    long display = absDevice.getHandle();
    try {
      NativeWindowFactory.getDefaultFactory().getToolkitLock().lock();
      X11Lib.XLockDisplay(display);
      int screen = x11Screen.getIndex();
      boolean isMultisampleAvailable = GLXUtil.isMultisampleAvailable(display);
      int[] attribs =
          X11GLXGraphicsConfiguration.GLCapabilities2AttribList(
              capabilities, false, isMultisampleAvailable, display, screen);
      XVisualInfo[] infos = null;

      XVisualInfo recommendedVis = GLX.glXChooseVisualCopied(display, screen, attribs, 0);
      if (DEBUG) {
        System.err.print("!!! glXChooseVisual recommended ");
        if (recommendedVis == null) {
          System.err.println("null visual");
        } else {
          System.err.println("visual id 0x" + Long.toHexString(recommendedVis.getVisualid()));
        }
      }
      int[] count = new int[1];
      XVisualInfo template = XVisualInfo.create();
      template.setScreen(screen);
      infos = X11Lib.XGetVisualInfoCopied(display, X11Lib.VisualScreenMask, template, count, 0);
      if (infos == null || infos.length < 1) {
        throw new GLException("Error while enumerating available XVisualInfos");
      }
      caps = new GLCapabilities[infos.length];
      for (int i = 0; i < infos.length; i++) {
        caps[i] =
            X11GLXGraphicsConfiguration.XVisualInfo2GLCapabilities(
                glProfile, display, infos[i], onscreen, false, isMultisampleAvailable);
        // Attempt to find the visual chosen by glXChooseVisual
        if (recommendedVis != null && recommendedVis.getVisualid() == infos[i].getVisualid()) {
          recommendedIndex = i;
        }
      }
      try {
        chosen = chooser.chooseCapabilities(capabilities, caps, recommendedIndex);
      } catch (NativeWindowException e) {
        if (DEBUG) {
          e.printStackTrace();
        }
        chosen = -1;
      }
      if (chosen < 0) {
        // keep on going ..
        if (DEBUG) {
          System.err.println(
              "X11GLXGraphicsConfiguration.chooseGraphicsConfigurationXVisual Failed .. unable to choose config, using first");
        }
        chosen = 0; // default ..
      } else if (chosen >= caps.length) {
        throw new GLException(
            "GLCapabilitiesChooser specified invalid index (expected 0.."
                + (caps.length - 1)
                + ")");
      }
      if (infos[chosen] == null) {
        throw new GLException("GLCapabilitiesChooser chose an invalid visual");
      }
      retXVisualInfo = XVisualInfo.create(infos[chosen]);
    } finally {
      X11Lib.XUnlockDisplay(display);
      NativeWindowFactory.getDefaultFactory().getToolkitLock().unlock();
    }
    return new X11GLXGraphicsConfiguration(
        x11Screen, caps[chosen], capabilities, chooser, retXVisualInfo, 0, -1);
  }
}