/*
 * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * - Redistribution of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 
 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
 * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
 * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
 * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
 * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
 * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
 * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that this software is not designed or intended for use
 * in the design, construction, operation or maintenance of any nuclear
 * facility.
 * 
 * Sun gratefully acknowledges that this software was originally authored
 * and developed by Kenneth Bradley Russell and Christopher John Kline.
 */

package com.sun.opengl.impl;

import java.awt.Toolkit;
import java.security.*;

public class NativeLibLoader {
  private static volatile boolean doLoading   = true;

  public static void disableLoading() {
    doLoading = false;
  }

  public static void enableLoading() {
    doLoading = true;
  }

  private static volatile boolean loadedCore = false;
  private static volatile boolean loadedAWTImpl = false;
  private static volatile boolean loadedDRIHack = false;

  public static void loadCore() {
    if (doLoading && !loadedCore) {
      synchronized (NativeLibLoader.class) {
        if (!loadedCore) {
          AccessController.doPrivileged(new PrivilegedAction() {
              public Object run() {
                System.loadLibrary("jogl");
                return null;
              }
            });
          loadedCore = true;
        }
      }
    }
  }

  public static void loadAWTImpl() {
    if (doLoading && !loadedAWTImpl) {
      synchronized (NativeLibLoader.class) {
        if (!loadedAWTImpl) {
          AccessController.doPrivileged(new PrivilegedAction() {
              public Object run() {
                boolean isOSX = System.getProperty("os.name").equals("Mac OS X");
                if (!isOSX) {
                  // Must pre-load JAWT on all non-Mac platforms to
                  // ensure references from jogl_awt shared object
                  // will succeed since JAWT shared object isn't in
                  // default library path
                  try {
                    System.loadLibrary("jawt");
                  } catch (UnsatisfiedLinkError e) {
                    // Accessibility technologies load JAWT themselves; safe to continue
                    // as long as JAWT is loaded by any loader
                    if (e.getMessage().indexOf("already loaded") == -1) {
                      throw e;
                    }
                  }
                }
                System.loadLibrary("jogl_awt");

                return null;
              }
            });
          loadedAWTImpl = true;
        }
      }
    }
  }

  // See DRIHack.java in com/sun/opengl/impl/x11/ for description of
  // why this is needed
  public static void loadDRIHack() {
    if (doLoading && !loadedDRIHack) {
      synchronized (NativeLibLoader.class) {
        if (!loadedDRIHack) {
          AccessController.doPrivileged(new PrivilegedAction() {
              public Object run() {
                System.loadLibrary("jogl_drihack");
                return null;
              }
            });
          loadedDRIHack = true;
        }
      }
    }
  }
}