/*
 * Copyright (c) 2010-2023 JogAmp Community. All rights reserved.
 * 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.
 */

package com.jogamp.opengl;

import jogamp.opengl.Debug;
import jogamp.opengl.GLDrawableFactoryImpl;
import jogamp.opengl.GLDynamicLookupHelper;

import com.jogamp.common.ExceptionUtils;
import com.jogamp.common.GlueGenVersion;
import com.jogamp.common.jvm.JNILibLoaderBase;
import com.jogamp.common.os.Platform;
import com.jogamp.common.util.PropertyAccess;
import com.jogamp.common.util.ReflectionUtil;
import com.jogamp.common.util.SecurityUtil;
import com.jogamp.common.util.VersionUtil;
import com.jogamp.common.util.cache.TempJarCache;
import com.jogamp.common.util.locks.LockFactory;
import com.jogamp.common.util.locks.RecursiveThreadGroupLock;
import com.jogamp.gluegen.runtime.FunctionAddressResolver;
import com.jogamp.nativewindow.NativeWindowVersion;

import com.jogamp.nativewindow.AbstractGraphicsDevice;
import com.jogamp.nativewindow.NativeWindowFactory;
import com.jogamp.opengl.fixedfunc.GLPointerFunc;

import java.lang.reflect.Constructor;
import java.security.PrivilegedAction;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Specifies the the OpenGL profile.
 *
 * This class static singleton initialization queries the availability of all OpenGL Profiles
 * and instantiates singleton GLProfile objects for each available profile.
 *
 * The platform default profile may be used, using {@link GLProfile#GetProfileDefault()},
 * or more specialized versions using the other static GetProfile methods.
 */
public class GLProfile {

    public static final boolean DEBUG;

    /**
     * In case no native OpenGL core profiles are required
     * and if one platform may have a buggy implementation,
     * setting the property <code>jogl.disable.openglcore</code> disables querying possible existing native OpenGL core profiles.
     * <p>
     * This exclusion is disabled for {@link Platform.OSType#MACOS} and {@link Platform.OSType#IOS}.
     * </p>
     */
    public static final boolean disableOpenGLCore;

    /**
     * In case the implementation of the <i>ARB_create_context</i>
     * context creation extension is buggy on one platform,
     * setting the property <code>jogl.disable.openglarbcontext</code> disables utilizing it.
     * <p>
     * This exclusion also disables {@link #disableOpenGLES OpenGL ES}.
     * </p>
     * <p>
     * This exclusion is disabled for {@link Platform.OSType#MACOS} and {@link Platform.OSType#IOS}.
     * </p>
     */
    public static final boolean disableOpenGLARBContext;

    /**
     * In case no OpenGL ES profiles are required
     * and if one platform may have a buggy implementation,
     * setting the property <code>jogl.disable.opengles</code> disables querying possible existing OpenGL ES profiles.
     */
    public static final boolean disableOpenGLES;

    /**
     * In case no OpenGL desktop profiles are required
     * and if one platform may have a buggy implementation,
     * setting the property <code>jogl.disable.opengldesktop</code> disables querying possible existing OpenGL desktop profiles.
     */
    public static final boolean disableOpenGLDesktop;

    /**
     * In case no EGL implementation is available
     * like on the {@link Platform.OSType#IOS} platform,
     * this is set to {@code true}.
     */
    public static final boolean disabledEGL;

    /**
     * Disable surfaceless OpenGL context capability and its probing
     * by setting the property <code>jogl.disable.surfacelesscontext</code>.
     * <p>
     * By default surfaceless OpenGL context capability is probed,
     * i.e. whether an OpenGL context can be made current without a default framebuffer.
     * </p>
     * <p>
     * If probing fails or if this property is set, the {@link GLRendererQuirks quirk} {@link GLRendererQuirks#NoSurfacelessCtx}
     * is being set.
     * </p>
     */
    public static final boolean disableSurfacelessContext;

    /**
     * We have to disable support for ANGLE, the D3D ES2 emulation on Windows provided w/ Firefox and Chrome.
     * When run in the mentioned browsers, the eglInitialize(..) implementation crashes.
     * <p>
     * This can be overridden by explicitly enabling ANGLE on Windows by setting the property
     * <code>jogl.enable.ANGLE</code>.
     * </p>
     */
    public static final boolean enableANGLE;

    static {
        // Also initializes TempJarCache if shall be used.
        Platform.initSingleton();
        final boolean isIOS = Platform.OSType.IOS == Platform.getOSType();
        final boolean isOSXorIOS = Platform.OSType.MACOS == Platform.getOSType() || isIOS;

        DEBUG = Debug.debug("GLProfile");
        disabledEGL = isIOS;
        disableOpenGLCore = PropertyAccess.isPropertyDefined("jogl.disable.openglcore", true) && !isOSXorIOS;
        disableOpenGLARBContext = PropertyAccess.isPropertyDefined("jogl.disable.openglarbcontext", true) && !isOSXorIOS;
        disableOpenGLES = disableOpenGLARBContext || PropertyAccess.isPropertyDefined("jogl.disable.opengles", true);
        disableOpenGLDesktop = PropertyAccess.isPropertyDefined("jogl.disable.opengldesktop", true);
        disableSurfacelessContext = PropertyAccess.isPropertyDefined("jogl.disable.surfacelesscontext", true);
        enableANGLE = PropertyAccess.isPropertyDefined("jogl.enable.ANGLE", true);
    }

    /**
     * @return <code>true</code> if JOGL has been initialized, i.e. manually via {@link #initSingleton()} or implicit,
     *         otherwise returns <code>false</code>.
     *
     * @since 2.2.1
     */
    public static boolean isInitialized() {
        initLock.lock();
        try {
            return initialized;
        } finally {
            initLock.unlock();
        }
    }

    /**
     * Static initialization of JOGL.
     *
     * <p>
     * This method shall not need to be called for other reasons than having a defined initialization sequence.
     * </p>
     *
     * <P>
     * In case this method is not invoked, GLProfile is initialized implicit by
     * the first call to {@link #getDefault()}, {@link #get(java.lang.String)}.
     * <P>
     *
     * <p>
     * To initialize JOGL at startup ASAP, this method may be invoked in the <i>main class</i>'s
     * static initializer block, in the <i>static main() method</i> or in the <i>Applet init() method</i>.
     * </p>
     *
     * <p>
     * Since JOGL's initialization is complex and involves multi threading, it is <b>not</b> recommended
     * to be have it invoked on the AWT EDT thread. In case all JOGL usage is performed
     * on the AWT EDT, invoke this method outside the AWT EDT - see above.
     * </p>
     *
     */
    public static void initSingleton() {
        final boolean justInitialized;
        initLock.lock();
        try {
            if(!initialized) {
                initialized = true;
                justInitialized = true;
                if(DEBUG) {
                    System.err.println("GLProfile.initSingleton() - thread "+Thread.currentThread().getName());
                    ExceptionUtils.dumpStack(System.err);
                }

                if(ReflectionUtil.DEBUG_STATS_FORNAME) {
                    ReflectionUtil.resetForNameCount();
                }

                // run the whole static initialization privileged to speed up,
                // since this skips checking further access
                SecurityUtil.doPrivileged(new PrivilegedAction<Object>() {
                    @Override
                    public Object run() {
                        Platform.initSingleton();

                        if( TempJarCache.isInitialized(true) ) {
                           final ClassLoader cl = GLProfile.class.getClassLoader();
                           final String newtDebugClassName = "jogamp.newt.Debug";
                           final Class<?>[] classesFromJavaJars = new Class<?>[] { jogamp.nativewindow.Debug.class, jogamp.opengl.Debug.class, null };
                           if( ReflectionUtil.isClassAvailable(newtDebugClassName, cl) ) {
                               classesFromJavaJars[2] = ReflectionUtil.getClass(newtDebugClassName, false, cl);
                           }
                           JNILibLoaderBase.addNativeJarLibsJoglCfg(classesFromJavaJars);
                        }
                        initProfilesForDefaultDevices();
                        return null;
                    }
                });
                if( ReflectionUtil.DEBUG_STATS_FORNAME ) {
                    if( justInitialized ) {
                        System.err.println(ReflectionUtil.getForNameStats(null).toString());
                    }
                }
            } else {
                justInitialized = false;
            }
        } finally {
            initLock.unlock();
        }
        if(DEBUG) {
            if( justInitialized && ( hasGL234Impl || hasGL234OnMobileImpl || hasGLES1Impl || hasGLES3Impl ) ) {
                System.err.println(JoglVersion.getDefaultOpenGLInfo(defaultDevice, null, true));
            }
        }
    }

    /**
     * Trigger eager initialization of GLProfiles for the given device,
     * in case it isn't done yet.
     *
     * @throws GLException if no profile for the given device is available.
     */
    public static void initProfiles(final AbstractGraphicsDevice device) throws GLException {
        getProfileMap(device, true);
    }

    /**
     * Manual shutdown method, may be called after your last JOGL use
     * within the running JVM.<br>
     * It releases all temporary created resources, ie issues {@link com.jogamp.opengl.GLDrawableFactory#shutdown()}.<br>
     * The shutdown implementation is called via the JVM shutdown hook, if not manually invoked.<br>
     * <p>
     * This method shall not need to be called for other reasons than issuing a proper shutdown of resources at a defined time.
     * </p>
     */
    public static void shutdown() {
        initLock.lock();
        try {
            if(initialized) {
                initialized = false;
                if(DEBUG) {
                    System.err.println("GLProfile.shutdown() - thread "+Thread.currentThread().getName());
                    ExceptionUtils.dumpStack(System.err);
                }
                GLDrawableFactory.shutdown();
            }
        } finally {
            initLock.unlock();
        }
    }

    //
    // Query platform available OpenGL implementation
    //

    /**
     * Returns the availability of a profile on a device.
     *
     * @param device a valid AbstractGraphicsDevice, or <code>null</null> for the default device.
     * @param profile a valid GLProfile name ({@link #GL4bc}, {@link #GL4}, {@link #GL2}, ..),
     *        or <code>[ null, GL ]</code> for the default profile.
     * @return true if the profile is available for the device, otherwise false.
     */
    public static boolean isAvailable(final AbstractGraphicsDevice device, final String profile) {
        initSingleton();
        return isAvailableImpl(getProfileMap(device, false), profile);
    }
    private static boolean isAvailableImpl(final HashMap<String /*GLProfile_name*/, GLProfile> map, final String profile) {
        return null != map && null != map.get(profile);
    }

    /**
     * Returns the availability of a profile on the default device.
     *
     * @param profile a valid GLProfile name ({@link #GL4bc}, {@link #GL4}, {@link #GL2}, ..),
     *        or <code>[ null, GL ]</code> for the default profile.
     * @return true if the profile is available for the default device, otherwise false.
     */
    public static boolean isAvailable(final String profile) {
        return isAvailable(null, profile);
    }

    /**
     * Returns the availability of any profile on the default device.
     *
     * @return true if any profile is available for the default device, otherwise false.
     */
    public static boolean isAnyAvailable() {
        return isAvailable(null, null);
    }

    public static String glAvailabilityToString(final AbstractGraphicsDevice device) {
        return glAvailabilityToString(device, null).toString();
    }

    public static StringBuilder glAvailabilityToString(final AbstractGraphicsDevice device, final StringBuilder sb) {
        return glAvailabilityToString(device, sb, null, 0);
    }
    private static StringBuilder doIndent(final StringBuilder sb, final String indent, int indentCount) {
        while(indentCount>0) {
            sb.append(indent);
            indentCount--;
        }
        return sb;
    }
    public static StringBuilder glAvailabilityToString(AbstractGraphicsDevice device, StringBuilder sb, final String indent, int indentCount) {
        boolean avail;
        if(null == sb) {
            sb = new StringBuilder();
        }
        final boolean useIndent = null != indent;

        initSingleton();

        int allCount = 0;
        int nativeCount = 0;

        if(null==device) {
            device = defaultDevice;
        }
        final HashMap<String /*GLProfile_name*/, GLProfile> map = getProfileMap(device, false);

        if(useIndent) {
            doIndent(sb, indent, indentCount).append("Natives");
            indentCount++;
            doIndent(sb.append(Platform.getNewline()), indent, indentCount).append(GL4bc+" ").append(indent);
        } else {
            sb.append("Natives["+GL4bc+" ");
        }
        avail=isAvailableImpl(map, GL4bc);
        sb.append(avail);
        if(avail) {
            nativeCount++;
            glAvailabilityToString(device, sb.append(" "), 4, GLContext.CTX_PROFILE_COMPAT);
        }
        allCount++;

        if(useIndent) {
            doIndent(sb.append(Platform.getNewline()), indent, indentCount).append(GL4+" ").append(indent);
        } else {
            sb.append(", "+GL4+" ");
        }
        avail=isAvailableImpl(map, GL4);
        sb.append(avail);
        if(avail) {
            nativeCount++;
            glAvailabilityToString(device, sb.append(" "), 4, GLContext.CTX_PROFILE_CORE);
        }
        allCount++;

        if(useIndent) {
            doIndent(sb.append(Platform.getNewline()), indent, indentCount).append(GLES3+" ").append(indent);
        } else {
            sb.append(", "+GLES3+" ");
        }
        avail=isAvailableImpl(map, GLES3);
        sb.append(avail);
        if(avail) {
            nativeCount++;
            glAvailabilityToString(device, sb.append(" "), 3, GLContext.CTX_PROFILE_ES);
        }
        allCount++;

        if(useIndent) {
            doIndent(sb.append(Platform.getNewline()), indent, indentCount).append(GL3bc+" ").append(indent);
        } else {
            sb.append(", "+GL3bc+" ");
        }
        avail=isAvailableImpl(map, GL3bc);
        sb.append(avail);
        if(avail) {
            nativeCount++;
            glAvailabilityToString(device, sb.append(" "), 3, GLContext.CTX_PROFILE_COMPAT);
        }
        allCount++;

        if(useIndent) {
            doIndent(sb.append(Platform.getNewline()), indent, indentCount).append(GL3+" ").append(indent);
        } else {
            sb.append(", "+GL3+" ");
        }
        avail=isAvailableImpl(map, GL3);
        sb.append(avail);
        if(avail) {
            nativeCount++;
            glAvailabilityToString(device, sb.append(" "), 3, GLContext.CTX_PROFILE_CORE);
        }
        allCount++;

        if(useIndent) {
            doIndent(sb.append(Platform.getNewline()), indent, indentCount).append(GL2+" ").append(indent);
        } else {
            sb.append(", "+GL2+" ");
        }
        avail=isAvailableImpl(map, GL2);
        sb.append(avail);
        if(avail) {
            nativeCount++;
            glAvailabilityToString(device, sb.append(" "), 2, GLContext.CTX_PROFILE_COMPAT);
        }
        allCount++;

        if(useIndent) {
            doIndent(sb.append(Platform.getNewline()), indent, indentCount).append(GLES2+" ").append(indent);
        } else {
            sb.append(", "+GLES2+" ");
        }
        avail=isAvailableImpl(map, GLES2);
        sb.append(avail);
        if(avail) {
            nativeCount++;
            glAvailabilityToString(device, sb.append(" "), 2, GLContext.CTX_PROFILE_ES);
        }
        allCount++;

        if(useIndent) {
            doIndent(sb.append(Platform.getNewline()), indent, indentCount).append(GLES1+" ").append(indent);
        } else {
            sb.append(", "+GLES1+" ");
        }
        avail=isAvailableImpl(map, GLES1);
        sb.append(avail);
        if(avail) {
            nativeCount++;
            glAvailabilityToString(device, sb.append(" "), 1, GLContext.CTX_PROFILE_ES);
        }
        allCount++;

        if(useIndent) {
            doIndent(sb.append(Platform.getNewline()), indent, indentCount).append("Count\t"+nativeCount+" / "+allCount);
            indentCount--;
            doIndent(sb.append(Platform.getNewline()), indent, indentCount).append("Common");
            indentCount++;
        } else {
            sb.append(", count "+nativeCount+" / "+allCount+"], Common[");
        }

        if(useIndent) {
            doIndent(sb.append(Platform.getNewline()), indent, indentCount).append(GL4ES3+" ").append(indent);
        } else {
            sb.append(", "+GL4ES3+" ");
        }
        sb.append(isAvailableImpl(map, GL4ES3));
        allCount++;

        if(useIndent) {
            doIndent(sb.append(Platform.getNewline()), indent, indentCount).append(GL2GL3+" ").append(indent);
        } else {
            sb.append(", "+GL2GL3+" ");
        }
        sb.append(isAvailableImpl(map, GL2GL3));
        allCount++;

        if(useIndent) {
            doIndent(sb.append(Platform.getNewline()), indent, indentCount).append(GL2ES2+" ").append(indent);
        } else {
            sb.append(", "+GL2ES2+" ");
        }
        sb.append(isAvailableImpl(map, GL2ES2));
        allCount++;

        if(useIndent) {
            doIndent(sb.append(Platform.getNewline()), indent, indentCount).append(GL2ES1+" ").append(indent);
        } else {
            sb.append(", "+GL2ES1+" ");
        }
        sb.append(isAvailableImpl(map, GL2ES1));
        allCount++;

        if(useIndent) {
            indentCount--;
            doIndent(sb.append(Platform.getNewline()), indent, indentCount).append("Mappings");
            indentCount++;
        } else {
            sb.append("], Mappings[");
        }

        int profileCount = 0;

        if(null != map) {
            for (final Map.Entry<String,GLProfile> entry : map.entrySet()) {
                if( GL_DEFAULT != entry.getKey() ) {
                    if(useIndent) {
                        doIndent(sb.append(Platform.getNewline()), indent, indentCount);
                    }
                    sb.append(entry.getKey()+(useIndent?" \t":" ")+entry.getValue());
                    if(!useIndent) {
                        sb.append(", ");
                    }
                    profileCount++;
                }
            }
            if(useIndent) {
                doIndent(sb.append(Platform.getNewline()), indent, indentCount).append("default ");
            } else {
                sb.append(", default ");
            }
            try {
                sb.append(getDefault(device));
            } catch (final GLException gle) {
                sb.append("n/a");
            }
        }
        if(useIndent) {
            doIndent(sb.append(Platform.getNewline()), indent, indentCount).append("Count\t"+profileCount+" / "+allCount);
            sb.append(Platform.getNewline());
        } else {
            sb.append(", count "+profileCount+" / "+allCount+"]");
        }

        return sb;
    }

    /** Uses the default device */
    public static String glAvailabilityToString() {
        return glAvailabilityToString(null);
    }

    //
    // Public (user-visible) profiles
    //

    /** The desktop OpenGL compatibility profile 4.x, with x >= 0, ie GL2 plus GL4.<br>
        <code>bc</code> stands for backward compatibility. */
    public static final String GL4bc = "GL4bc"; // Implicitly intern(), see Bug 1059

    /** The desktop OpenGL core profile 4.x, with x >= 0 */
    public static final String GL4   = "GL4"; // Implicitly intern(), see Bug 1059

    /** The desktop OpenGL compatibility profile 3.x, with x >= 1, ie GL2 plus GL3.<br>
        <code>bc</code> stands for backward compatibility. */
    public static final String GL3bc = "GL3bc"; // Implicitly intern(), see Bug 1059

    /** The desktop OpenGL core profile 3.x, with x >= 1 */
    public static final String GL3   = "GL3"; // Implicitly intern(), see Bug 1059

    /** The desktop OpenGL profile 1.x up to 3.0 */
    public static final String GL2   = "GL2"; // Implicitly intern(), see Bug 1059

    /** The embedded OpenGL profile ES 1.x, with x >= 0 */
    public static final String GLES1 = "GLES1"; // Implicitly intern(), see Bug 1059

    /** The embedded OpenGL profile ES 2.x, with x >= 0 */
    public static final String GLES2 = "GLES2"; // Implicitly intern(), see Bug 1059

    /** The embedded OpenGL profile ES 3.x, with x >= 0 */
    public static final String GLES3 = "GLES3"; // Implicitly intern(), see Bug 1059

    /** The intersection of the desktop GL2 and embedded ES1 profile */
    public static final String GL2ES1 = "GL2ES1"; // Implicitly intern(), see Bug 1059

    /** The intersection of the desktop GL3, GL2 and embedded ES2 profile */
    public static final String GL2ES2 = "GL2ES2"; // Implicitly intern(), see Bug 1059

    /** The intersection of the desktop GL3 and GL2 profile */
    public static final String GL2GL3 = "GL2GL3"; // Implicitly intern(), see Bug 1059

    /** The intersection of the desktop GL4 and ES3 profile, available only if either ES3 or GL4 w/ <code>GL_ARB_ES3_compatibility</code> is available. */
    public static final String GL4ES3 = "GL4ES3"; // Implicitly intern(), see Bug 1059

    /** The default profile, used for the device default profile map  */
    private static final String GL_DEFAULT = "GL_DEFAULT"; // Implicitly intern(), see Bug 1059
    /** The default profile, used for the device default profile map  */
    private static final String GL_GL = "GL"; // Implicitly intern(), see Bug 1059

    /**
     * All GL Profiles in the order of default detection.
     * Desktop compatibility profiles (the one with fixed function pipeline) comes first
     * from highest to lowest version.
     * <p> This includes the generic subset profiles GL2GL3, GL2ES2 and GL2ES1.</p>
     *
     * <ul>
     *  <li> GL4bc </li>
     *  <li> GL3bc </li>
     *  <li> GL2 </li>
     *  <li> GL4 </li>
     *  <li> GL3 </li>
     *  <li> GLES3 </li>
     *  <li> GL4ES3 </li>
     *  <li> GL2GL3 </li>
     *  <li> GLES2 </li>
     *  <li> GL2ES2 </li>
     *  <li> GLES1 </li>
     *  <li> GL2ES1 </li>
     * </ul>
     *
     */
    public static final String[] GL_PROFILE_LIST_ALL = new String[] { GL4bc, GL3bc, GL2, GL4, GL3, GLES3, GL4ES3, GL2GL3, GLES2, GL2ES2, GLES1, GL2ES1 };

    /**
     * Order of maximum profiles.
     *
     * <ul>
     *  <li> GL4bc </li>
     *  <li> GL4 </li>
     *  <li> GL3bc </li>
     *  <li> GL3 </li>
     *  <li> GLES3 </li>
     *  <li> GL2 </li>
     *  <li> GLES2 </li>
     *  <li> GLES1 </li>
     * </ul>
     *
     */
    public static final String[] GL_PROFILE_LIST_MAX = new String[] { GL4bc, GL4, GL3bc, GL3, GLES3, GL2, GLES2, GLES1 };

    /**
     * Order of minimum profiles.
     *
     * <ul>
     *  <li> GLES1 </li>
     *  <li> GLES2 </li>
     *  <li> GL2 </li>
     *  <li> GLES3 </li>
     *  <li> GL3 </li>
     *  <li> GL3bc </li>
     *  <li> GL4 </li>
     *  <li> GL4bc </li>
     * </ul>
     *
     */
    public static final String[] GL_PROFILE_LIST_MIN = new String[] { GLES1, GLES2, GL2, GLES3, GL3, GL3bc, GL4, GL4bc };

    /**
     * Order of minimum original desktop profiles.
     *
     * <ul>
     *  <li> GL2 </li>
     *  <li> GL3bc </li>
     *  <li> GL4bc </li>
     *  <li> GL3 </li>
     *  <li> GL4 </li>
     * </ul>
     *
     */
    public static final String[] GL_PROFILE_LIST_MIN_DESKTOP = new String[] { GL2, GL3bc, GL4bc, GL3, GL4 };

    /**
     * Order of maximum original mobile profiles.
     *
     * <ul>
     *  <li> GLES3 </li>
     *  <li> GLES2 </li>
     *  <li> GLES1 </li>
     * </ul>
     *
     */
    public static final String[] GL_PROFILE_LIST_MAX_MOBILE = new String[] { GLES3, GLES2, GLES1 };

    /**
     * Order of maximum fixed function profiles
     *
     * <ul>
     *  <li> GL4bc </li>
     *  <li> GL3bc </li>
     *  <li> GL2 </li>
     *  <li> GLES1 </li>
     * </ul>
     *
     */
    public static final String[] GL_PROFILE_LIST_MAX_FIXEDFUNC = new String[] { GL4bc, GL3bc, GL2, GLES1 };

    /**
     * Order of maximum programmable shader profiles
     *
     * <ul>
     *  <li> GL4bc </li>
     *  <li> GL4 </li>
     *  <li> GL3bc </li>
     *  <li> GL3 </li>
     *  <li> GLES3 </li>
     *  <li> GL2 </li>
     *  <li> GLES2 </li>
     * </ul>
     *
     */
    public static final String[] GL_PROFILE_LIST_MAX_PROGSHADER = new String[] { GL4bc, GL4, GL3bc, GL3, GLES3, GL2, GLES2 };

    /**
     * Order of maximum programmable shader <i>core only</i> profiles
     *
     * <ul>
     *  <li> GL4 </li>
     *  <li> GL3 </li>
     *  <li> GLES3 </li>
     *  <li> GLES2 </li>
     * </ul>
     *
     */
    public static final String[] GL_PROFILE_LIST_MAX_PROGSHADER_CORE = new String[] { GL4, GL3, GLES3, GLES2 };

    /** Returns a default GLProfile object, reflecting the best for the running platform.
     * It selects the first of the set {@link GLProfile#GL_PROFILE_LIST_ALL}
     * and favors hardware acceleration.
     * @throws GLException if no profile is available for the device.
     * @see #GL_PROFILE_LIST_ALL
     */
    public static GLProfile getDefault(final AbstractGraphicsDevice device) {
        final GLProfile glp = get(device, GL_DEFAULT);
        return glp;
    }

    /** Returns a default GLProfile object, reflecting the best for the running platform.
     * It selects the first of the set {@link GLProfile#GL_PROFILE_LIST_ALL}
     * and favors hardware acceleration.
     * <p>Uses the default device.</p>
     * @throws GLException if no profile is available for the default device.
     */
    public static GLProfile getDefault() {
        return getDefault(defaultDevice);
    }

    /**
     * Returns the highest profile.
     * It selects the first of the set: {@link GLProfile#GL_PROFILE_LIST_MAX}
     *
     * @throws GLException if no profile is available for the device.
     * @see #GL_PROFILE_LIST_MAX
     */
    public static GLProfile getMaximum(final AbstractGraphicsDevice device, final boolean favorHardwareRasterizer)
        throws GLException
    {
        return get(device, GL_PROFILE_LIST_MAX, favorHardwareRasterizer);
    }

    /** Uses the default device
     * @throws GLException if no profile is available for the default device.
     * @see #GL_PROFILE_LIST_MAX
     */
    public static GLProfile getMaximum(final boolean favorHardwareRasterizer)
        throws GLException
    {
        return get(GL_PROFILE_LIST_MAX, favorHardwareRasterizer);
    }

    /**
     * Returns the lowest profile.
     * It selects the first of the set: {@link GLProfile#GL_PROFILE_LIST_MIN}
     *
     * @throws GLException if no desktop profile is available for the device.
     * @see #GL_PROFILE_LIST_MIN
     */
    public static GLProfile getMinimum(final AbstractGraphicsDevice device, final boolean favorHardwareRasterizer)
        throws GLException
    {
        return get(device, GL_PROFILE_LIST_MIN, favorHardwareRasterizer);
    }

    /** Uses the default device
     * @throws GLException if no desktop profile is available for the default device.
     * @see #GL_PROFILE_LIST_MIN
     */
    public static GLProfile getMinimum(final boolean favorHardwareRasterizer)
        throws GLException
    {
        return get(GL_PROFILE_LIST_MIN, favorHardwareRasterizer);
    }


    /**
     * Returns the highest profile, implementing the fixed function pipeline.
     * It selects the first of the set: {@link GLProfile#GL_PROFILE_LIST_MAX_FIXEDFUNC}
     *
     * @throws GLException if no fixed function profile is available for the device.
     * @see #GL_PROFILE_LIST_MAX_FIXEDFUNC
     */
    public static GLProfile getMaxFixedFunc(final AbstractGraphicsDevice device, final boolean favorHardwareRasterizer)
        throws GLException
    {
        return get(device, GL_PROFILE_LIST_MAX_FIXEDFUNC, favorHardwareRasterizer);
    }

    /** Uses the default device
     * @throws GLException if no fixed function profile is available for the default device.
     * @see #GL_PROFILE_LIST_MAX_FIXEDFUNC
     */
    public static GLProfile getMaxFixedFunc(final boolean favorHardwareRasterizer)
        throws GLException
    {
        return get(GL_PROFILE_LIST_MAX_FIXEDFUNC, favorHardwareRasterizer);
    }

    /**
     * Returns the highest profile, implementing the programmable shader pipeline.
     * It selects the first of the set: {@link GLProfile#GL_PROFILE_LIST_MAX_PROGSHADER}
     *
     * @throws GLException if no programmable profile is available for the device.
     * @see #GL_PROFILE_LIST_MAX_PROGSHADER
     */
    public static GLProfile getMaxProgrammable(final AbstractGraphicsDevice device, final boolean favorHardwareRasterizer)
        throws GLException
    {
        return get(device, GL_PROFILE_LIST_MAX_PROGSHADER, favorHardwareRasterizer);
    }

    /** Uses the default device
     * @throws GLException if no programmable profile is available for the default device.
     * @see #GL_PROFILE_LIST_MAX_PROGSHADER
     */
    public static GLProfile getMaxProgrammable(final boolean favorHardwareRasterizer)
        throws GLException
    {
        return get(GL_PROFILE_LIST_MAX_PROGSHADER, favorHardwareRasterizer);
    }

    /**
     * Returns the highest profile, implementing the programmable shader <i>core</i> pipeline <i>only</i>.
     * It selects the first of the set: {@link GLProfile#GL_PROFILE_LIST_MAX_PROGSHADER_CORE}
     *
     * @throws GLException if no programmable core profile is available for the device.
     * @see #GL_PROFILE_LIST_MAX_PROGSHADER_CORE
     */
    public static GLProfile getMaxProgrammableCore(final AbstractGraphicsDevice device, final boolean favorHardwareRasterizer)
        throws GLException
    {
        return get(device, GL_PROFILE_LIST_MAX_PROGSHADER_CORE, favorHardwareRasterizer);
    }

    /** Uses the default device
     * @throws GLException if no programmable core profile is available for the default device.
     * @see #GL_PROFILE_LIST_MAX_PROGSHADER_CORE
     */
    public static GLProfile getMaxProgrammableCore(final boolean favorHardwareRasterizer)
        throws GLException
    {
        return get(GL_PROFILE_LIST_MAX_PROGSHADER_CORE, favorHardwareRasterizer);
    }

    /**
     * Returns the GL2ES1 profile implementation, hence compatible w/ GL2ES1.<br/>
     * It returns:
     * <pre>
     *   GLProfile.get(device, GLProfile.GL2ES1).getImpl());
     * </pre>
     * <p>Selection favors hardware rasterizer.</p>
     *
     * @throws GLException if no GL2ES1 compatible profile is available for the default device.
     * @see #isGL2ES1()
     * @see #get(AbstractGraphicsDevice, String)
     * @see #getImpl()
     */
    public static GLProfile getGL2ES1(final AbstractGraphicsDevice device)
        throws GLException
    {
        return get(device, GL2ES1).getImpl();
    }

    /**
     * Calls {@link #getGL2ES1(AbstractGraphicsDevice)} using the default device.
     * <p>Selection favors hardware rasterizer.</p>
     * @see #getGL2ES1(AbstractGraphicsDevice)
     */
    public static GLProfile getGL2ES1()
        throws GLException
    {
        return get(defaultDevice, GL2ES1).getImpl();
    }

    /**
     * Returns the GL2ES2 profile implementation, hence compatible w/ GL2ES2.<br/>
     * It returns:
     * <pre>
     *   GLProfile.get(device, GLProfile.GL2ES2).getImpl());
     * </pre>
     * <p>Selection favors hardware rasterizer.</p>
     *
     * @throws GLException if no GL2ES2 compatible profile is available for the default device.
     * @see #isGL2ES2()
     * @see #get(AbstractGraphicsDevice, String)
     * @see #getImpl()
     */
    public static GLProfile getGL2ES2(final AbstractGraphicsDevice device)
        throws GLException
    {
        return get(device, GL2ES2).getImpl();
    }

    /**
     * Calls {@link #getGL2ES2(AbstractGraphicsDevice)} using the default device.
     * <p>Selection favors hardware rasterizer.</p>
     * @see #getGL2ES2(AbstractGraphicsDevice)
     */
    public static GLProfile getGL2ES2()
        throws GLException
    {
        return get(defaultDevice, GL2ES2).getImpl();
    }

    /**
     * Returns the GL4ES3 profile implementation, hence compatible w/ GL4ES3.<br/>
     * It returns:
     * <pre>
     *   GLProfile.get(device, GLProfile.GL4ES3).getImpl());
     * </pre>
     * <p>Selection favors hardware rasterizer.</p>
     *
     * @throws GLException if no GL4ES3 compatible profile is available for the default device.
     * @see #isGL4ES3()
     * @see #get(AbstractGraphicsDevice, String)
     * @see #getImpl()
     */
    public static GLProfile getGL4ES3(final AbstractGraphicsDevice device)
        throws GLException
    {
        return get(device, GL4ES3).getImpl();
    }

    /**
     * Calls {@link #getGL4ES3(AbstractGraphicsDevice)} using the default device.
     * <p>Selection favors hardware rasterizer.</p>
     * @see #getGL4ES3(AbstractGraphicsDevice)
     */
    public static GLProfile getGL4ES3()
        throws GLException
    {
        return get(defaultDevice, GL4ES3).getImpl();
    }

    /**
     * Returns the GL2GL3 profile implementation, hence compatible w/ GL2GL3.<br/>
     * It returns:
     * <pre>
     *   GLProfile.get(device, GLProfile.GL2GL3).getImpl());
     * </pre>
     * <p>Selection favors hardware rasterizer.</p>
     *
     * @throws GLException if no GL2GL3 compatible profile is available for the default device.
     * @see #isGL2GL3()
     * @see #get(AbstractGraphicsDevice, String)
     * @see #getImpl()
     */
    public static GLProfile getGL2GL3(final AbstractGraphicsDevice device)
        throws GLException
    {
        return get(device, GL2GL3).getImpl();
    }

    /**
     * Calls {@link #getGL2GL3(AbstractGraphicsDevice)} using the default device.
     * <p>Selection favors hardware rasterizer.</p>
     * @see #getGL2GL3(AbstractGraphicsDevice)
     */
    public static GLProfile getGL2GL3()
        throws GLException
    {
        return get(defaultDevice, GL2GL3).getImpl();
    }

    /** Returns a GLProfile object.
     * verifies the given profile and chooses an appropriate implementation.
     * A generic value of <code>null</code> or <code>GL</code> will result in
     * the default profile.
     *
     * @param device a valid AbstractGraphicsDevice, or <code>null</null> for the default device.
     * @param profile a valid GLProfile name ({@link #GL4bc}, {@link #GL4}, {@link #GL2}, ..),
     *        or <code>[ null, GL ]</code> for the default profile.
     * @throws GLException if the requested profile is not available for the device.
     */
    public static GLProfile get(final AbstractGraphicsDevice device, String profile)
        throws GLException
    {
        if(null==profile || profile == GL_GL) {
            profile = GL_DEFAULT;
        }
        final HashMap<String /*GLProfile_name*/, GLProfile> glpMap = getProfileMap(device, true);
        final GLProfile glp = glpMap.get(profile);
        if(null == glp) {
            throw new GLException("Profile "+profile+" is not available on "+device+", but: "+glpMap.values());
        }
        return glp;
    }

    /** Uses the default device
     * @param profile a valid GLProfile name ({@link #GL4bc}, {@link #GL4}, {@link #GL2}, ..),
     *        or <code>[ null, GL ]</code> for the default profile.
     * @throws GLException if the requested profile is not available for the default device.
     */
    public static GLProfile get(final String profile)
        throws GLException
    {
        return get(defaultDevice, profile);
    }

    /**
     * Returns the first profile from the given list,
     * where an implementation is available.
     *
     * @param device a valid AbstractGraphicsDevice, or <code>null</null> for the default device.
     * @param profiles array of valid GLProfile name ({@link #GL4bc}, {@link #GL4}, {@link #GL2}, ..)
     * @param favorHardwareRasterizer set to true, if hardware rasterizer shall be favored, otherwise false.
     * @throws GLException if the non of the requested profiles is available for the device.
     */
    public static GLProfile get(final AbstractGraphicsDevice device, final String[] profiles, final boolean favorHardwareRasterizer)
        throws GLException
    {
        GLProfile glProfileAny = null;

        final HashMap<String /*GLProfile_name*/, GLProfile> map = getProfileMap(device, true);
        for(int i=0; i<profiles.length; i++) {
            final GLProfile glProfile = map.get(profiles[i]);
            if(null!=glProfile) {
                if(!favorHardwareRasterizer) {
                    return glProfile;
                }
                if(glProfile.isHardwareRasterizer()) {
                    return glProfile;
                }
                if(null==glProfileAny) {
                    glProfileAny = glProfile;
                }
            }
        }
        if(null!=glProfileAny) {
            return glProfileAny;
        }
        throw new GLException("Profiles "+array2String(profiles)+" not available on device "+device);
    }

    /** Uses the default device
     * @param profiles array of valid GLProfile name ({@link #GL4bc}, {@link #GL4}, {@link #GL2}, ..)
     * @param favorHardwareRasterizer set to true, if hardware rasterizer shall be favored, otherwise false.
     * @throws GLException if the non of the requested profiles is available for the default device.
     */
    public static GLProfile get(final String[] profiles, final boolean favorHardwareRasterizer)
        throws GLException
    {
        return get(defaultDevice, profiles, favorHardwareRasterizer);
    }

    /** Indicates whether the native OpenGL ES1 profile is in use.
     * This requires an EGL interface.
     */
    public static boolean usesNativeGLES1(final String profileImpl) {
        return GLES1 == profileImpl;
    }

    /** Indicates whether the native OpenGL ES3 or ES2 profile is in use.
     * This requires an EGL, ES3 or ES2 compatible interface.
     */
    public static boolean usesNativeGLES2(final String profileImpl) {
        return GLES3 == profileImpl || GLES2 == profileImpl;
    }

    /** Indicates whether the native OpenGL ES2 profile is in use.
     * This requires an EGL, ES3 compatible interface.
     */
    public static boolean usesNativeGLES3(final String profileImpl) {
        return GLES3 == profileImpl;
    }

    /** Indicates whether either of the native OpenGL ES profiles are in use. */
    public static boolean usesNativeGLES(final String profileImpl) {
        return usesNativeGLES2(profileImpl) || usesNativeGLES1(profileImpl);
    }

    /** @return {@link com.jogamp.nativewindow.NativeWindowFactory#isAWTAvailable()} and
        JOGL's AWT part */
    public static boolean isAWTAvailable() { return isAWTAvailable; }

    public static String getGLTypeName(final int type) {
        switch (type) {
        case GL.GL_UNSIGNED_BYTE:
            return "GL_UNSIGNED_BYTE";
        case GL.GL_BYTE:
            return "GL_BYTE";
        case GL.GL_UNSIGNED_SHORT:
            return "GL_UNSIGNED_SHORT";
        case GL.GL_SHORT:
            return "GL_SHORT";
        case GL.GL_FLOAT:
            return "GL_FLOAT";
        case GL.GL_FIXED:
            return "GL_FIXED";
        case com.jogamp.opengl.GL2ES2.GL_INT:
            return "GL_INT";
        case GL.GL_UNSIGNED_INT:
            return "GL_UNSIGNED_INT";
        case com.jogamp.opengl.GL2GL3.GL_DOUBLE:
            return "GL_DOUBLE";
        case com.jogamp.opengl.GL2.GL_2_BYTES:
            return "GL_2_BYTES";
        case com.jogamp.opengl.GL2.GL_3_BYTES:
            return "GL_3_BYTES";
        case com.jogamp.opengl.GL2.GL_4_BYTES:
            return "GL_4_BYTES";
        }
        return null;
    }

    public static String getGLArrayName(final int array) {
        switch(array) {
        case GLPointerFunc.GL_VERTEX_ARRAY:
            return "GL_VERTEX_ARRAY";
        case GLPointerFunc.GL_NORMAL_ARRAY:
            return "GL_NORMAL_ARRAY";
        case GLPointerFunc.GL_COLOR_ARRAY:
            return "GL_COLOR_ARRAY";
        case GLPointerFunc.GL_TEXTURE_COORD_ARRAY:
            return "GL_TEXTURE_COORD_ARRAY";
        }
        return null;
    }

    public final String getGLImplBaseClassName() {
        return getGLImplBaseClassName(getImplName());
    }
    private static final String getGLImplBaseClassName(final String profileImpl) {
        if( GLES2 == profileImpl || GLES3 == profileImpl ) {
            return "jogamp.opengl.es3.GLES3";
        } else if( GLES1 == profileImpl ) {
            return "jogamp.opengl.es1.GLES1";
        } else if ( GL4bc == profileImpl ||
                    GL4   == profileImpl ||
                    GL3bc == profileImpl ||
                    GL3   == profileImpl ||
                    GL2   == profileImpl ) {
            return "jogamp.opengl.gl4.GL4bc";
        } else {
            throw new GLException("unsupported profile \"" + profileImpl + "\"");
        }
    }

    public final Constructor<?> getGLCtor(final boolean glObject) {
        return getGLCtor(getImplName(), glObject);
    }
    private static final Constructor<?> getGLCtor(final String profileImpl, final boolean glObject) {
        if( GLES2 == profileImpl || GLES3 == profileImpl ) {
            return glObject ? ctorGLES3Impl : ctorGLES3ProcAddr;
        } else if( GLES1 == profileImpl ) {
            return glObject ? ctorGLES1Impl : ctorGLES1ProcAddr;
        } else if ( GL4bc == profileImpl ||
                    GL4   == profileImpl ||
                    GL3bc == profileImpl ||
                    GL3   == profileImpl ||
                    GL2   == profileImpl ) {
            return glObject ? ctorGL234Impl : ctorGL234ProcAddr;
        } else {
            throw new GLException("unsupported profile \"" + profileImpl + "\"");
        }
    }

    /**
     * @param o GLProfile object to compare with
     * @return true if given Object is a GLProfile and
     *         if both, profile and profileImpl is equal with this.
     */
    @Override
    public final boolean equals(final Object o) {
        if(this==o) { return true; }
        if(o instanceof GLProfile) {
            final GLProfile glp = (GLProfile)o;
            return getName() == glp.getName() && getImplName() == glp.getImplName() ; // uses .intern()!
        }
        return false;
    }

    @Override
    public int hashCode() {
        int hash = 5;
        hash = 97 * hash + getImplName().hashCode();
        hash = 97 * hash + getName().hashCode();
        return hash;
    }

    /**
     * @param glp GLProfile to compare with
     * @throws GLException if given GLProfile and this aren't equal
     */
    public final void verifyEquality(final GLProfile glp) throws GLException  {
        if(!this.equals(glp)) {
            throw new GLException("GLProfiles are not equal: "+this+" != "+glp);
        }
    }

    /** return this profiles name */
    public final String getName() {
        return profile;
    }

    /** return this profiles implementation, eg. GL2ES2 -> GL2, or GL3 -> GL3 */
    public final GLProfile getImpl() {
        return null != profileImpl ? profileImpl : this;
    }

    /** return true if impl. is a hardware rasterizer, otherwise false. */
    public final boolean isHardwareRasterizer() {
        return isHardwareRasterizer;
    }

    /**
     * return this profiles implementation name, eg. GL2ES2 -> GL2, or GL3 -> GL3
     */
    public final String getImplName() {
        return null != profileImpl ? profileImpl.getName() : getName();
    }

    /** Indicates whether this profile is capable of GL4bc.  <p>Includes [ GL4bc ].</p> */
    public final boolean isGL4bc() {
        return GL4bc == profile;
    }

    /** Indicates whether this profile is capable of GL4.    <p>Includes [ GL4bc, GL4 ].</p> */
    public final boolean isGL4() {
        return isGL4bc() || GL4 == profile;
    }

    /** Indicates whether this profile is capable of GL3bc.  <p>Includes [ GL4bc, GL3bc ].</p> */
    public final boolean isGL3bc() {
        return isGL4bc() || GL3bc == profile;
    }

    /** Indicates whether this profile is capable of GL3.    <p>Includes [ GL4bc, GL4, GL3bc, GL3 ].</p> */
    public final boolean isGL3() {
        return isGL4() || isGL3bc() || GL3 == profile;
    }

    /** Indicates whether this profile is capable of GL2 .   <p>Includes [ GL4bc, GL3bc, GL2 ].</p> */
    public final boolean isGL2() {
        return isGL3bc() || GL2 == profile;
    }

    /** Indicates whether this profile is capable of GLES1.  <p>Includes [ GLES1 ].</p> */
    public final boolean isGLES1() {
        return GLES1 == profile;
    }

    /** Indicates whether this profile is capable of GLES2.  <p>Includes [ GLES2, GLES3 ].</p> */
    public final boolean isGLES2() {
        return isGLES3() || GLES2 == profile;
    }

    /** Indicates whether this profile is capable of GLES3.  <p>Includes [ GLES3 ].</p> */
    public final boolean isGLES3() {
        return GLES3 == profile;
    }

    /** Indicates whether this profile is capable of GLES.  <p>Includes [ GLES1, GLES2, GLES3 ].</p> */
    public final boolean isGLES() {
        return GLES3 == profile || GLES2 == profile || GLES1 == profile;
    }

    /** Indicates whether this profile is capable of GL2ES1. <p>Includes [ GL4bc, GL3bc, GL2, GLES1, GL2ES1 ].</p> */
    public final boolean isGL2ES1() {
        return GL2ES1 == profile || isGLES1() || isGL2();
    }

    /** Indicates whether this profile is capable of GL2GL3. <p>Includes [ GL4bc, GL4, GL3bc, GL3, GL2, GL2GL3 ].</p> */
    public final boolean isGL2GL3() {
        return GL2GL3 == profile || isGL3() || isGL2();
    }

    /** Indicates whether this profile is capable of GL2ES2. <p>Includes [ GL4bc, GL4, GL3bc, GL3, GLES3, GL2, GL2GL3, GL2ES2, GLES2 ].</p> */
    public final boolean isGL2ES2() {
        return GL2ES2 == profile || isGLES2() || isGL2GL3();
    }

    /**
     * Indicates whether this profile is capable of GL2ES3. <p>Includes [ GL4bc, GL4, GL3bc, GL3, GLES3, GL3ES3, GL2, GL2GL3 ].</p>
     * @see #isGL3ES3()
     * @see #isGL2GL3()
     */
    public final boolean isGL2ES3() {
        return isGL3ES3() || isGL2GL3();
    }

    /** Indicates whether this profile is capable of GL3ES3. <p>Includes [ GL4bc, GL4, GL3bc, GL3, GLES3 ].</p> */
    public final boolean isGL3ES3() {
        return isGL4ES3() || isGL3();
    }

    /** Indicates whether this profile is capable of GL4ES3. <p>Includes [ GL4bc, GL4, GLES3 ].</p> */
    public final boolean isGL4ES3() {
        return GL4ES3 == profile || isGLES3() || isGL4();
    }

    /** Indicates whether this profile supports GLSL, i.e. {@link #isGL2ES2()}. */
    public final boolean hasGLSL() {
        return isGL2ES2() ;
    }

    /** Indicates whether this profile uses the native OpenGL ES1 implementations. */
    public final boolean usesNativeGLES1() {
        return GLES1 == getImplName();
    }

    /** Indicates whether this profile uses the native OpenGL ES2 implementations. */
    public final boolean usesNativeGLES2() {
        return GLES2 == getImplName();
    }

    /** Indicates whether this profile uses the native OpenGL ES3 implementations. */
    public final boolean usesNativeGLES3() {
        return GLES3 == getImplName();
    }

    /** Indicates whether this profile uses either of the native OpenGL ES implementations. */
    public final boolean usesNativeGLES() {
        return usesNativeGLES3() || usesNativeGLES2() || usesNativeGLES1();
    }

    /**
     * General validation if type is a valid GL data type for the current profile.
     * <p>
     * Disclaimer: The validation might not satisfy updated OpenGL specifications.
     * </p>
     */
    public boolean isValidDataType(final int type, final boolean throwException) {
        switch(type) {
            case GL.GL_UNSIGNED_BYTE:
            case GL.GL_BYTE:
            case GL.GL_UNSIGNED_SHORT:
            case GL.GL_SHORT:
            case GL.GL_FLOAT:
            case GL.GL_FIXED:
                return true;
            case com.jogamp.opengl.GL2ES2.GL_INT:
            case GL.GL_UNSIGNED_INT:
                if( isGL2ES2() ) {
                    return true;
                }
            case com.jogamp.opengl.GL2GL3.GL_DOUBLE:
                if( isGL3() ) {
                    return true;
                }
            case com.jogamp.opengl.GL2.GL_2_BYTES:
            case com.jogamp.opengl.GL2.GL_3_BYTES:
            case com.jogamp.opengl.GL2.GL_4_BYTES:
                if( isGL2() ) {
                    return true;
                }
        }
        if(throwException) {
            throw new GLException("Illegal data type on profile "+this+": "+type);
        }
        return false;
    }

    /**
     * General validation if index, comps and type are valid for the current profile.
     * <p>
     * Disclaimer: The validation might not satisfy updated OpenGL specifications.
     * </p>
     */
    public boolean isValidArrayDataType(final int index, final int comps, final int type,
                                        final boolean isVertexAttribPointer, final boolean throwException) {
        if( isGLES1() ) {
            if(isVertexAttribPointer) {
                if(throwException) {
                    throw new GLException("Illegal array type for "+getGLArrayName(index)+" on profile GLES1: VertexAttribPointer");
                }
                return false;
            }
            switch(index) {
                case GLPointerFunc.GL_VERTEX_ARRAY:
                case GLPointerFunc.GL_TEXTURE_COORD_ARRAY:
                    switch(type) {
                        case GL.GL_BYTE:
                        case GL.GL_SHORT:
                        case GL.GL_FIXED:
                        case GL.GL_FLOAT:
                            break;
                        default:
                            if(throwException) {
                                throw new GLException("Illegal data type for "+getGLArrayName(index)+" on profile GLES1: "+type);
                            }
                            return false;
                    }
                    switch(comps) {
                        case 0:
                        case 2:
                        case 3:
                        case 4:
                            break;
                        default:
                            if(throwException) {
                                throw new GLException("Illegal component number for "+getGLArrayName(index)+" on profile GLES1: "+comps);
                            }
                            return false;
                    }
                    break;
                case GLPointerFunc.GL_NORMAL_ARRAY:
                    switch(type) {
                        case GL.GL_BYTE:
                        case GL.GL_SHORT:
                        case GL.GL_FIXED:
                        case GL.GL_FLOAT:
                            break;
                        default:
                            if(throwException) {
                                throw new GLException("Illegal data type for "+getGLArrayName(index)+" on profile GLES1: "+type);
                            }
                            return false;
                    }
                    switch(comps) {
                        case 0:
                        case 3:
                            break;
                        default:
                            if(throwException) {
                                throw new GLException("Illegal component number for "+getGLArrayName(index)+" on profile GLES1: "+comps);
                            }
                            return false;
                    }
                    break;
                case GLPointerFunc.GL_COLOR_ARRAY:
                    switch(type) {
                        case GL.GL_UNSIGNED_BYTE:
                        case GL.GL_FIXED:
                        case GL.GL_FLOAT:
                            break;
                        default:
                            if(throwException) {
                                throw new GLException("Illegal data type for "+getGLArrayName(index)+" on profile GLES1: "+type);
                            }
                            return false;
                    }
                    switch(comps) {
                        case 0:
                        case 4:
                            break;
                        default:
                            if(throwException) {
                                throw new GLException("Illegal component number for "+getGLArrayName(index)+" on profile GLES1: "+comps);
                            }
                            return false;
                    }
                    break;
            }
        } else if( isGLES3() ) {
            // simply ignore !isVertexAttribPointer case, since it is simulated anyway ..
            switch(type) {
                case GL.GL_UNSIGNED_BYTE:
                case GL.GL_BYTE:
                case GL.GL_UNSIGNED_SHORT:
                case GL.GL_SHORT:
                case com.jogamp.opengl.GL2ES2.GL_INT:
                case GL.GL_UNSIGNED_INT:
                case GL.GL_HALF_FLOAT:
                case GL.GL_FLOAT:
                case GL.GL_FIXED:
                case GL3ES3.GL_INT_2_10_10_10_REV:
                case com.jogamp.opengl.GL2ES2.GL_UNSIGNED_INT_2_10_10_10_REV:
                case GL.GL_UNSIGNED_INT_10F_11F_11F_REV:
                    break;
                default:
                    if(throwException) {
                        throw new GLException("Illegal data type on profile GLES3: "+type);
                    }
                    return false;
            }
            /** unable to validate .. could be any valid type/component combination
            switch(comps) {
                case 0:
                case 1:
                case 2:
                case 3:
                case 4:
                    break;
                default:
                    if(throwException) {
                        throw new GLException("Illegal component number on profile GLES3: "+comps);
                    }
                    return false;
            } */
        } else if( isGLES2() ) {
            // simply ignore !isVertexAttribPointer case, since it is simulated anyway ..
            switch(type) {
                case GL.GL_UNSIGNED_BYTE:
                case GL.GL_BYTE:
                case GL.GL_UNSIGNED_SHORT:
                case GL.GL_SHORT:
                case GL.GL_FLOAT:
                case GL.GL_FIXED:
                    break;
                default:
                    if(throwException) {
                        throw new GLException("Illegal data type on profile GLES2: "+type);
                    }
                    return false;
            }
            /** unable to validate .. could be any valid type/component combination
            switch(comps) {
                case 0:
                case 1:
                case 2:
                case 3:
                case 4:
                    break;
                default:
                    if(throwException) {
                        throw new GLException("Illegal component number on profile GLES2: "+comps);
                    }
                    return false;
            } */
        } else if( isGL2ES2() ) {
            if(isVertexAttribPointer) {
                switch(type) {
                    case GL.GL_UNSIGNED_BYTE:
                    case GL.GL_BYTE:
                    case GL.GL_UNSIGNED_SHORT:
                    case GL.GL_SHORT:
                    case com.jogamp.opengl.GL2ES2.GL_INT:
                    case GL.GL_UNSIGNED_INT:
                    case GL.GL_HALF_FLOAT:
                    case GL.GL_FLOAT:
                    case GL.GL_FIXED:
                    case GL3ES3.GL_INT_2_10_10_10_REV:
                    case com.jogamp.opengl.GL2ES2.GL_UNSIGNED_INT_2_10_10_10_REV:
                    case com.jogamp.opengl.GL2GL3.GL_DOUBLE:
                    case GL.GL_UNSIGNED_INT_10F_11F_11F_REV:
                        break;
                    default:
                        if(throwException) {
                            throw new GLException("Illegal data type on profile GL2: "+type);
                        }
                        return false;
                }
                switch(comps) {
                    case 0:
                    case 1:
                    case 2:
                    case 3:
                    case 4:
                        break;
                    default:
                        if(throwException) {
                            throw new GLException("Illegal component number on profile GL2: "+comps);
                        }
                        return false;
                }
            } else {
                switch(index) {
                    case GLPointerFunc.GL_VERTEX_ARRAY:
                        switch(type) {
                            case GL.GL_SHORT:
                            case GL.GL_FLOAT:
                            case com.jogamp.opengl.GL2ES2.GL_INT:
                            case com.jogamp.opengl.GL2GL3.GL_DOUBLE:
                                break;
                            default:
                                if(throwException) {
                                    throw new GLException("Illegal data type for "+getGLArrayName(index)+" on profile GL2: "+type);
                                }
                                return false;
                        }
                        switch(comps) {
                            case 0:
                            case 2:
                            case 3:
                            case 4:
                                break;
                            default:
                                if(throwException) {
                                    throw new GLException("Illegal component number for "+getGLArrayName(index)+" on profile GL2: "+comps);
                                }
                                return false;
                        }
                        break;
                    case GLPointerFunc.GL_NORMAL_ARRAY:
                        switch(type) {
                            case GL.GL_BYTE:
                            case GL.GL_SHORT:
                            case GL.GL_FLOAT:
                            case com.jogamp.opengl.GL2ES2.GL_INT:
                            case com.jogamp.opengl.GL2GL3.GL_DOUBLE:
                                break;
                            default:
                                if(throwException) {
                                    throw new GLException("Illegal data type for "+getGLArrayName(index)+" on profile GL2: "+type);
                                }
                                return false;
                        }
                        switch(comps) {
                            case 0:
                            case 3:
                                break;
                            default:
                                if(throwException) {
                                    throw new GLException("Illegal component number for "+getGLArrayName(index)+" on profile GLES1: "+comps);
                                }
                                return false;
                        }
                        break;
                    case GLPointerFunc.GL_COLOR_ARRAY:
                        switch(type) {
                            case GL.GL_UNSIGNED_BYTE:
                            case GL.GL_BYTE:
                            case GL.GL_UNSIGNED_SHORT:
                            case GL.GL_SHORT:
                            case GL.GL_FLOAT:
                            case com.jogamp.opengl.GL2ES2.GL_INT:
                            case GL.GL_UNSIGNED_INT:
                            case com.jogamp.opengl.GL2GL3.GL_DOUBLE:
                                break;
                            default:
                                if(throwException) {
                                    throw new GLException("Illegal data type for "+getGLArrayName(index)+" on profile GL2: "+type);
                                }
                                return false;
                        }
                        switch(comps) {
                            case 0:
                            case 3:
                            case 4:
                                break;
                            default:
                                if(throwException) {
                                    throw new GLException("Illegal component number for "+getGLArrayName(index)+" on profile GL2: "+comps);
                                }
                                return false;
                        }
                        break;
                    case GLPointerFunc.GL_TEXTURE_COORD_ARRAY:
                        switch(type) {
                            case GL.GL_SHORT:
                            case GL.GL_FLOAT:
                            case com.jogamp.opengl.GL2ES2.GL_INT:
                            case com.jogamp.opengl.GL2GL3.GL_DOUBLE:
                                break;
                            default:
                                if(throwException) {
                                    throw new GLException("Illegal data type for "+getGLArrayName(index)+" on profile GL2: "+type);
                                }
                                return false;
                        }
                        switch(comps) {
                            case 0:
                            case 1:
                            case 2:
                            case 3:
                            case 4:
                                break;
                            default:
                                if(throwException) {
                                    throw new GLException("Illegal component number for "+getGLArrayName(index)+" on profile GL2: "+comps);
                                }
                                return false;
                        }
                        break;
                }
            }
        }
        return true;
    }

    @Override
    public String toString() {
        return "GLProfile[" + getName() + "/" + getImplName() + "."+(this.isHardwareRasterizer?"hw":"sw")+(isCustom?".custom":"")+"]";
    }

    private static /*final*/ boolean isAWTAvailable;

    private static /*final*/ boolean hasDesktopGLFactory;
    private static /*final*/ boolean hasGL234Impl;
    private static /*final*/ boolean hasMobileFactory;
    private static /*final*/ boolean hasGLES3Impl;
    private static /*final*/ boolean hasGLES1Impl;
    private static /*final*/ boolean hasGL234OnMobileImpl;
    private static /*final*/ Constructor<?> ctorGL234Impl;
    private static /*final*/ Constructor<?> ctorGLES3Impl;
    private static /*final*/ Constructor<?> ctorGLES1Impl;
    private static /*final*/ Constructor<?> ctorGL234ProcAddr;
    private static /*final*/ Constructor<?> ctorGLES3ProcAddr;
    private static /*final*/ Constructor<?> ctorGLES1ProcAddr;

    private static /*final*/ GLDrawableFactoryImpl mobileFactory = null;
    private static /*final*/ GLDrawableFactoryImpl desktopFactory = null;
    private static /*final*/ AbstractGraphicsDevice defaultDevice = null;

    private static boolean initialized = false;
    private static final RecursiveThreadGroupLock initLock = LockFactory.createRecursiveThreadGroupLock();

    private static final Class<?>[] ctorGLArgs = new Class<?>[] { GLProfile.class, jogamp.opengl.GLContextImpl.class };
    private static final Class<?>[] ctorProcArgs = new Class<?>[] { FunctionAddressResolver.class };
    private static final String GL4bcImplClassName = "jogamp.opengl.gl4.GL4bcImpl";
    private static final String GL4bcProcClassName = "jogamp.opengl.gl4.GL4bcProcAddressTable";
    private static final String GLES1ImplClassName = "jogamp.opengl.es1.GLES1Impl";
    private static final String GLES1ProcClassName = "jogamp.opengl.es1.GLES1ProcAddressTable";
    private static final String GLES3ImplClassName = "jogamp.opengl.es3.GLES3Impl";
    private static final String GLES3ProcClassName = "jogamp.opengl.es3.GLES3ProcAddressTable";

    private static final Constructor<?> getCtor(final String clazzName, final boolean glObject, final ClassLoader cl) {
        try {
            return ReflectionUtil.getConstructor(clazzName, glObject ? ctorGLArgs : ctorProcArgs, false, cl);
        } catch (final Throwable t) {
            if( DEBUG ) {
                System.err.println("Caught: "+t.getMessage());
                t.printStackTrace();
            }
            return null;
        }
    }

    private static final void initGLCtorImpl() {
        final ClassLoader classloader = GLProfile.class.getClassLoader();

        // depends on hasDesktopGLFactory
        {
            final Constructor<?> ctorGL = getCtor(GL4bcImplClassName, true, classloader);
            final Constructor<?> ctorProc = null != ctorGL ?  getCtor(GL4bcProcClassName, false, classloader) : null;
            if( null != ctorProc ) {
                hasGL234Impl   = true;
                ctorGL234Impl = ctorGL;
                ctorGL234ProcAddr = ctorProc;
            } else {
                hasGL234Impl   = false;
                ctorGL234Impl = null;
                ctorGL234ProcAddr = null;
            }
        }
        hasGL234OnMobileImpl = hasGL234Impl;

        // depends on hasEGLFactory
        {
            final Constructor<?> ctorGL = getCtor(GLES1ImplClassName, true, classloader);
            final Constructor<?> ctorProc = null != ctorGL ?  getCtor(GLES1ProcClassName, false, classloader) : null;
            if( null != ctorProc ) {
                hasGLES1Impl   = true;
                ctorGLES1Impl = ctorGL;
                ctorGLES1ProcAddr = ctorProc;
            } else {
                hasGLES1Impl   = false;
                ctorGLES1Impl = null;
                ctorGLES1ProcAddr = null;
            }
        }
        {
            final Constructor<?> ctorGL = getCtor(GLES3ImplClassName, true, classloader);
            final Constructor<?> ctorProc = null != ctorGL ?  getCtor(GLES3ProcClassName, false, classloader) : null;
            if( null != ctorProc ) {
                hasGLES3Impl   = true;
                ctorGLES3Impl = ctorGL;
                ctorGLES3ProcAddr = ctorProc;
            } else {
                hasGLES3Impl   = false;
                ctorGLES3Impl = null;
                ctorGLES3ProcAddr = null;
            }
        }
    }

    /**
     * Tries the profiles implementation and native libraries.
     */
    private static void initProfilesForDefaultDevices() {
        NativeWindowFactory.initSingleton();
        if(DEBUG) {
            System.err.println("GLProfile.init - thread: " + Thread.currentThread().getName());
            System.err.println(VersionUtil.getPlatformInfo());
            System.err.println(GlueGenVersion.getInstance());
            System.err.println(NativeWindowVersion.getInstance());
            System.err.println(JoglVersion.getInstance());
        }

        final ClassLoader classloader = GLProfile.class.getClassLoader();

        isAWTAvailable = NativeWindowFactory.isAWTAvailable() &&
                         ReflectionUtil.isClassAvailable("com.jogamp.opengl.awt.GLCanvas", classloader) ; // JOGL

        initGLCtorImpl();

        //
        // Iteration of desktop GL availability detection
        // utilizing the detected GL version in the shared context.
        //
        // - Instantiate GLDrawableFactory incl its shared dummy drawable/context,
        //   which will register at GLContext ..
        //
        GLDrawableFactory.initSingleton();

        Throwable t=null;
        // if successfull it has a shared dummy drawable and context created
        try {
            desktopFactory = (GLDrawableFactoryImpl) GLDrawableFactory.getFactoryImpl(GL2);
            if(null != desktopFactory) {
                final GLDynamicLookupHelper glLookupHelper = desktopFactory.getGLDynamicLookupHelper(2, GLContext.CTX_PROFILE_COMPAT);
                hasGL234Impl = null!=glLookupHelper && glLookupHelper.isLibComplete() && hasGL234Impl;
                hasDesktopGLFactory = hasGL234Impl;
            }
        } catch (final LinkageError le) {
            t=le;
        } catch (final RuntimeException re) {
            t=re;
        } catch (final Throwable tt) {
            t=tt;
        }
        if(DEBUG) {
            if(null!=t) {
                t.printStackTrace();
            }
        }

        final AbstractGraphicsDevice defaultDesktopDevice;
        if(null == desktopFactory) {
            hasDesktopGLFactory  = false;
            hasGL234Impl         = false;
            defaultDesktopDevice = null;
            if(DEBUG) {
                System.err.println("Info: GLProfile.init - Desktop GLDrawable factory not available");
            }
        } else {
            defaultDesktopDevice = desktopFactory.getDefaultDevice();
        }

        t=null;
        try {
            mobileFactory = (GLDrawableFactoryImpl) GLDrawableFactory.getFactoryImpl(GLES2);
            if(null != mobileFactory) {
                // update hasGLES1Impl, hasGLES3Impl, hasGL234OnEGLImpl based on library completion
                final GLDynamicLookupHelper es2DynLookup = mobileFactory.getGLDynamicLookupHelper(2, GLContext.CTX_PROFILE_ES);
                final GLDynamicLookupHelper es1DynLookup = mobileFactory.getGLDynamicLookupHelper(1, GLContext.CTX_PROFILE_ES);
                final GLDynamicLookupHelper glXDynLookup = mobileFactory.getGLDynamicLookupHelper(3, GLContext.CTX_PROFILE_CORE);
                hasGLES3Impl = null!=es2DynLookup && es2DynLookup.isLibComplete() && hasGLES3Impl;
                hasGLES1Impl = null!=es1DynLookup && es1DynLookup.isLibComplete() && hasGLES1Impl;
                hasGL234OnMobileImpl = null!=glXDynLookup && glXDynLookup.isLibComplete() && hasGL234OnMobileImpl;
                hasMobileFactory = hasGLES3Impl || hasGLES1Impl || hasGL234OnMobileImpl;
            }
        } catch (final LinkageError le) {
            t=le;
        } catch (final SecurityException se) {
            t=se;
        } catch (final NullPointerException npe) {
            t=npe;
        } catch (final RuntimeException re) {
            t=re;
        }
        if(DEBUG) {
            if(null!=t) {
                t.printStackTrace();
            }
        }

        final AbstractGraphicsDevice defaultMobileDevice;
        if(null == mobileFactory) {
            hasMobileFactory    = false;
            hasGL234OnMobileImpl= false;
            hasGLES3Impl     = false;
            hasGLES1Impl     = false;
            defaultMobileDevice = null;
            if(DEBUG) {
                System.err.println("Info: GLProfile.init - Mobile GLDrawable factory not available");
            }
        } else {
            defaultMobileDevice = mobileFactory.getDefaultDevice();
        }

        if( null != defaultDesktopDevice ) {
            defaultDevice = defaultDesktopDevice;
            if(DEBUG) {
                System.err.println("Info: GLProfile.init - Default device is desktop derived: "+defaultDevice);
            }
        } else if ( null != defaultMobileDevice ) {
            defaultDevice = defaultMobileDevice;
            if(DEBUG) {
                System.err.println("Info: GLProfile.init - Default device is mobile derived: "+defaultDevice);
            }
        } else {
            if(DEBUG) {
                System.err.println("Info: GLProfile.init - Default device not available");
            }
            defaultDevice = null;
        }

        // we require to initialize the EGL device 1st, if available
        final boolean addedMobileProfile     = null != defaultMobileDevice ? initProfilesForDevice(defaultMobileDevice) : false;
        final boolean addedDesktopProfile = null != defaultDesktopDevice ? initProfilesForDevice(defaultDesktopDevice) : false;
        final boolean addedAnyProfile     = addedMobileProfile || addedDesktopProfile ;

        if(DEBUG) {
            System.err.println("GLProfile.init addedAnyProfile       "+addedAnyProfile+" (desktop: "+addedDesktopProfile+", mobile "+addedMobileProfile+")");
            System.err.println("GLProfile.init isAWTAvailable        "+isAWTAvailable);
            System.err.println("GLProfile.init hasDesktopGLFactory   "+hasDesktopGLFactory);
            System.err.println("GLProfile.init hasGL234Impl          "+hasGL234Impl);
            System.err.println("GLProfile.init hasMobileFactory      "+hasMobileFactory);
            System.err.println("GLProfile.init hasGLES1Impl          "+hasGLES1Impl);
            System.err.println("GLProfile.init hasGLES3Impl          "+hasGLES3Impl);
            System.err.println("GLProfile.init hasGL234OnEGLImpl     "+hasGL234OnMobileImpl);
            System.err.println("GLProfile.init defaultDevice         "+defaultDevice);
            System.err.println("GLProfile.init defaultDevice Desktop "+defaultDesktopDevice);
            System.err.println("GLProfile.init defaultDevice Mobile  "+defaultMobileDevice);
            System.err.println("GLProfile.init profile order         "+array2String(GL_PROFILE_LIST_ALL));
        }
    }

    /**
     * @param device the device for which profiles shall be initialized
     * @return true if any profile for the device exists, otherwise false
     */
    private static boolean initProfilesForDevice(final AbstractGraphicsDevice device) {
        if(null == device) {
            return false;
        }
        initLock.lock();
        try {
            final GLDrawableFactory factory = GLDrawableFactory.getFactory(device);
            if( null != factory ) {
                factory.enterThreadCriticalZone();
                try {
                    return initProfilesForDeviceCritical(device);
                } finally {
                    factory.leaveThreadCriticalZone();
                }
            }
        } finally {
            initLock.unlock();
        }
        return false;
    }
    private static boolean initProfilesForDeviceCritical(final AbstractGraphicsDevice device) {
        final boolean isSet = GLContext.getAvailableGLVersionsSet(device);

        if(DEBUG) {
            System.err.println("Info: GLProfile.initProfilesForDevice: "+device+" ("+device.getClass().getName()+"), isSet "+isSet+", hasDesktopGLFactory "+hasDesktopGLFactory+", hasEGLFactory "+hasMobileFactory);
        }
        if(isSet) {
            // Avoid recursion and check whether impl. is sane!
            final String deviceKey = device.getUniqueID();
            final HashMap<String /*GLProfile_name*/, GLProfile> map = deviceConn2ProfileMap.get(deviceKey);
            if( null == map ) {
                throw new InternalError("GLContext Avail. GLVersion is set - but no profile map for device: "+device);
            }
            return null != map.get(GL_DEFAULT);
        }

        HashMap<String, GLProfile> mappedDesktopProfiles = null;
        boolean addedDesktopProfile = false;
        HashMap<String, GLProfile> mappedEGLProfiles = null;
        boolean addedMobileProfile = false;

        final boolean deviceIsDesktopCompatible = hasDesktopGLFactory && desktopFactory.getIsDeviceCompatible(device);

        if( deviceIsDesktopCompatible ) {
            // 1st pretend we have all Desktop and EGL profiles ..
            computeProfileMap(device, true /* desktopCtxUndef*/, true  /* esCtxUndef */);

            // Triggers eager initialization of share context in GLDrawableFactory for the device,
            // hence querying all available GLProfiles
            final Thread sharedResourceThread = desktopFactory.getSharedResourceThread();
            final boolean initLockOwnerAdded;
            if(null != sharedResourceThread) {
                if( !initLock.isOriginalOwner(sharedResourceThread) ) {
                    initLock.addOwner(sharedResourceThread);
                    initLockOwnerAdded = true;
                } else {
                    initLockOwnerAdded = false;
                }
            } else {
                initLockOwnerAdded = false;
            }
            final boolean desktopSharedCtxAvail = desktopFactory.createSharedResource(device);
            if( initLockOwnerAdded ) {
                initLock.removeOwner(sharedResourceThread);
            }
            if( desktopSharedCtxAvail ) {
                if( !GLContext.getAvailableGLVersionsSet(device) ) {
                    throw new InternalError("Available GLVersions not set for "+device);
                }
                mappedDesktopProfiles = computeProfileMap(device, false /* desktopCtxUndef*/, false /* esCtxUndef */);
                addedDesktopProfile = mappedDesktopProfiles.size() > 0;
                if (DEBUG) {
                    System.err.println("GLProfile.initProfilesForDevice: "+device+": desktop Shared Ctx "+desktopSharedCtxAvail+
                            ", profiles: "+(addedDesktopProfile ? mappedDesktopProfiles.size() : 0));
                }
            }
        }

        final boolean deviceIsMobileCompatible = hasMobileFactory && mobileFactory.getIsDeviceCompatible(device);

        // also test GLES1, GLES2 and GLES3 on desktop, since we have implementations / emulations available.
        if( deviceIsMobileCompatible ) {
            // 1st pretend we have all EGL profiles ..
            computeProfileMap(device, true /* desktopCtxUndef*/, true /* esCtxUndef */);

            // Triggers eager initialization of share context in GLDrawableFactory for the device,
            // hence querying all available GLProfiles
            final Thread sharedResourceThread = mobileFactory.getSharedResourceThread();
            final boolean initLockOwnerAdded;
            if(null != sharedResourceThread) {
                if( !initLock.isOriginalOwner(sharedResourceThread) ) {
                    initLock.addOwner(sharedResourceThread);
                    initLockOwnerAdded = true;
                } else {
                    initLockOwnerAdded = false;
                }
            } else {
                initLockOwnerAdded = false;
            }
            final boolean eglSharedCtxAvail = mobileFactory.createSharedResource(device);
            if( initLockOwnerAdded ) {
                initLock.removeOwner(sharedResourceThread);
            }
            if( eglSharedCtxAvail ) {
                if( !GLContext.getAvailableGLVersionsSet(device) ) {
                    throw new InternalError("Available GLVersions not set for "+device);
                }
                mappedEGLProfiles = computeProfileMap(device, false /* desktopCtxUndef*/, false /* esCtxUndef */);
                addedMobileProfile = mappedEGLProfiles.size() > 0;
            }
            if (DEBUG) {
                System.err.println("GLProfile.initProfilesForDevice: "+device+": mobile Shared Ctx "+eglSharedCtxAvail+
                                   ", profiles: "+(addedMobileProfile ? mappedEGLProfiles.size() : 0));
            }
        }

        final HashMap<String, GLProfile> mappedAllProfiles;
        if( addedMobileProfile ) {
            // If run on actual desktop device, e.g. '.x11_:0_0',
            // GLContextImpl.remapAvailableGLVersion('.egl_:0_0' -> '.x11_:0_0')
            // ensures EGL profiles being mapped to upstream desktop device '.x11_:0_0'.
            mappedAllProfiles = mappedEGLProfiles;
        } else if( addedDesktopProfile ) {
            mappedAllProfiles = mappedDesktopProfiles;
        } else {
            mappedAllProfiles = new HashMap<String /*GLProfile_name*/, GLProfile>(); // empty
            if(DEBUG) {
                System.err.println("GLProfile: device could not be initialized: "+device);
                System.err.println("GLProfile: compatible w/ desktop: "+deviceIsDesktopCompatible+
                                            ", mobile "+deviceIsMobileCompatible);
                System.err.println("GLProfile: desktoplFactory      "+desktopFactory);
                System.err.println("GLProfile: mobileFactory        "+mobileFactory);
                System.err.println("GLProfile: hasGLES1Impl         "+hasGLES1Impl);
                System.err.println("GLProfile: hasGLES3Impl         "+hasGLES3Impl);
            }
        }
        setProfileMap(device, mappedAllProfiles); // merged mappedEGLProfiles if available, otherwise mappedDesktopProfiles

        GLContext.setAvailableGLVersionsSet(device, true);

        if (DEBUG) {
            System.err.println("GLProfile.initProfilesForDevice: "+device.getUniqueID()+": added profile(s): desktop "+addedDesktopProfile+", mobile "+addedMobileProfile);
            System.err.println("GLProfile.initProfilesForDevice: "+device.getUniqueID()+": "+glAvailabilityToString(device));
            if(addedDesktopProfile) {
                dumpGLInfo(desktopFactory, device);
                final List<GLCapabilitiesImmutable> availCaps = desktopFactory.getAvailableCapabilities(device);
                for(int i=0; i<availCaps.size(); i++) {
                    System.err.println(availCaps.get(i));
                }
            } else if(addedMobileProfile) {
                dumpGLInfo(mobileFactory, device);
                final List<GLCapabilitiesImmutable> availCaps = mobileFactory.getAvailableCapabilities(device);
                for(int i=0; i<availCaps.size(); i++) {
                    System.err.println(availCaps.get(i));
                }
            }
        }

        return addedDesktopProfile || addedMobileProfile;
    }

    private static void dumpGLInfo(final GLDrawableFactoryImpl factory, final AbstractGraphicsDevice device)  {
        final GLContext ctx = factory.getOrCreateSharedContext(device);
        if(null != ctx) {
            System.err.println("GLProfile.dumpGLInfo: "+ctx);
            if( GLContext.CONTEXT_NOT_CURRENT != ctx.makeCurrent() ) {
                try {
                    System.err.println(JoglVersion.getGLInfo(ctx.getGL(), null));
                } finally {
                    ctx.release();
                }
            } else {
                System.err.println("GLProfile.dumpGLInfo: Couldn't make context current");
            }
        } else {
            System.err.println("GLProfile.dumpGLInfo: shared context n/a");
            System.err.println(device.getClass().getSimpleName()+"[type "+
                    device.getType()+", connection "+device.getConnection()+"]:");
            System.err.println(GLProfile.glAvailabilityToString(device, null, "\t", 1).toString());
        }
    }

    public static AbstractGraphicsDevice getDefaultDevice() {
        initSingleton();
        return defaultDevice;
    }

    private static String array2String(final String[] list) {
        final StringBuilder msg = new StringBuilder();
        msg.append("[");
        for (int i = 0; i < list.length; i++) {
            if (i > 0)
                msg.append(", ");
            msg.append(list[i]);
        }
        msg.append("]");
        return msg.toString();
    }

    private static void glAvailabilityToString(final AbstractGraphicsDevice device, final StringBuilder sb, final int major, final int profile) {
        final String str = GLContext.getAvailableGLVersionAsString(device, major, profile);
        if(null==str) {
            throw new GLException("Internal Error");
        }
        sb.append("[");
        sb.append(str);
        sb.append("]");
    }

    private static HashMap<String, GLProfile> computeProfileMap(final AbstractGraphicsDevice device, final boolean desktopCtxUndef, final boolean esCtxUndef) {
        if (DEBUG) {
            System.err.println("GLProfile.init map "+device.getUniqueID()+", desktopCtxUndef "+desktopCtxUndef+", esCtxUndef "+esCtxUndef);
        }
        final boolean isHardwareRasterizer[] = new boolean[1];
        GLProfile defaultGLProfileAny = null;
        GLProfile defaultGLProfileHW = null;
        final HashMap<String, GLProfile> _mappedProfiles = new HashMap<String, GLProfile>(GL_PROFILE_LIST_ALL.length + 1 /* default */);
        for(int i=0; i<GL_PROFILE_LIST_ALL.length; i++) {
            final String profile = GL_PROFILE_LIST_ALL[i];
            final String profileImpl = computeProfileImpl(device, profile, desktopCtxUndef, esCtxUndef, isHardwareRasterizer);
            if( null != profileImpl ) {
                final GLProfile glProfile;
                if( profile.equals( profileImpl ) ) {
                    glProfile = new GLProfile(profile, null, isHardwareRasterizer[0], false /* custom */);
                } else {
                    final GLProfile _mglp = _mappedProfiles.get( profileImpl );
                    if( null == _mglp ) {
                        // Bug 1383: We may consider allowing cross mapping here,
                        // i.e. mapping on actually non-supported (implementation) profiles
                        throw new InternalError("XXX0 profile["+i+"]: "+profile+" -> profileImpl "+profileImpl+" !!! not mapped ");
                    }
                    glProfile = new GLProfile(profile, _mglp, isHardwareRasterizer[0], false /* custom */);
                }
                _mappedProfiles.put(profile, glProfile);
                if (DEBUG) {
                    System.err.println("GLProfile.init map "+glProfile+" on device "+device.getUniqueID());
                }
                if( null == defaultGLProfileHW && isHardwareRasterizer[0] ) {
                    defaultGLProfileHW=glProfile;
                    if (DEBUG) {
                        System.err.println("GLProfile.init map defaultHW "+glProfile+" on device "+device.getUniqueID());
                    }
                } else if( null == defaultGLProfileAny ) {
                    defaultGLProfileAny=glProfile;
                    if (DEBUG) {
                        System.err.println("GLProfile.init map defaultAny "+glProfile+" on device "+device.getUniqueID());
                    }
                }
            } else {
                if (DEBUG) {
                    System.err.println("GLProfile.init map *** no mapping for "+profile+" on device "+device.getUniqueID());
                }
            }
        }
        if( null != defaultGLProfileHW ) {
            _mappedProfiles.put(GL_DEFAULT, defaultGLProfileHW);
        } else if( null != defaultGLProfileAny ) {
            _mappedProfiles.put(GL_DEFAULT, defaultGLProfileAny);
        }
        setProfileMap(device, _mappedProfiles);
        return _mappedProfiles;
    }

    /**
     * Returns the profile implementation
     */
    private static String computeProfileImpl(final AbstractGraphicsDevice device, final String profile, final boolean desktopCtxUndef, final boolean esCtxUndef, final boolean isHardwareRasterizer[]) {
        final boolean hasAnyGL234Impl = hasGL234Impl || hasGL234OnMobileImpl;
        final boolean hardwareRasterizer[] = new boolean[1];
        if ( GL2ES1 == profile ) {
            final boolean gles1Available;
            final boolean gles1HWAvailable;
            if( hasGLES1Impl ) {
                gles1Available = esCtxUndef || GLContext.isGLES1Available(device, hardwareRasterizer);
                gles1HWAvailable = gles1Available && hardwareRasterizer[0] ;
            } else {
                gles1Available = false;
                gles1HWAvailable = false;
            }
            if( hasAnyGL234Impl ) {
                final boolean gl3bcAvailable = GLContext.isGL3bcAvailable(device, hardwareRasterizer);
                final boolean gl3bcHWAvailable = gl3bcAvailable && hardwareRasterizer[0] ;
                final boolean gl2Available = GLContext.isGL2Available(device, hardwareRasterizer);
                final boolean gl2HWAvailable = gl2Available && hardwareRasterizer[0] ;
                final boolean glAnyHWAvailable = gl3bcHWAvailable || gl2HWAvailable ||
                                                 gles1HWAvailable ;

                if( GLContext.isGL4bcAvailable(device, isHardwareRasterizer) &&
                    ( isHardwareRasterizer[0] || !glAnyHWAvailable ) ) {
                    return GL4bc;
                }
                if( gl3bcAvailable && ( gl3bcHWAvailable || !glAnyHWAvailable ) ) {
                    isHardwareRasterizer[0] = gl3bcHWAvailable;
                    return GL3bc;
                }
                if( ( desktopCtxUndef || gl2Available ) && ( gl2HWAvailable || !glAnyHWAvailable ) ) {
                    isHardwareRasterizer[0] = gl2HWAvailable;
                    return GL2;
                }
            }
            if( gles1Available ) {
                isHardwareRasterizer[0] = gles1HWAvailable;
                return GLES1;
            }
        } else if ( GL2ES2 == profile ) {
            final boolean gles2Available, gles3Available;
            final boolean gles2HWAvailable, gles3HWAvailable;
            if( hasGLES3Impl ) {
                gles2Available = esCtxUndef || GLContext.isGLES2Available(device, hardwareRasterizer);
                gles2HWAvailable = gles2Available && hardwareRasterizer[0] ;
                gles3Available = esCtxUndef || GLContext.isGLES3Available(device, hardwareRasterizer);
                gles3HWAvailable = gles3Available && hardwareRasterizer[0] ;
            } else {
                gles2Available = false;
                gles2HWAvailable = false;
                gles3Available = false;
                gles3HWAvailable = false;
            }
            if( hasAnyGL234Impl ) {
                final boolean gl4bcAvailable = GLContext.isGL4bcAvailable(device, hardwareRasterizer);
                final boolean gl4bcHWAvailable = gl4bcAvailable && hardwareRasterizer[0] ;
                final boolean gl3Available = GLContext.isGL3Available(device, hardwareRasterizer);
                final boolean gl3HWAvailable = gl3Available && hardwareRasterizer[0] ;
                final boolean gl3bcAvailable = GLContext.isGL3bcAvailable(device, hardwareRasterizer);
                final boolean gl3bcHWAvailable = gl3bcAvailable && hardwareRasterizer[0] ;
                final boolean gl2Available = GLContext.isGL2Available(device, hardwareRasterizer);
                final boolean gl2HWAvailable = gl2Available && hardwareRasterizer[0] ;
                final boolean glAnyHWAvailable = gl4bcHWAvailable || gl3HWAvailable || gl3bcHWAvailable || gl2HWAvailable ||
                                                 gles3HWAvailable || gles2HWAvailable ;

                if( GLContext.isGL4Available(device, isHardwareRasterizer) &&
                    ( isHardwareRasterizer[0] || !glAnyHWAvailable ) ) {
                    return GL4;
                }
                if( gl4bcAvailable && ( gl4bcHWAvailable || !glAnyHWAvailable ) ) {
                    isHardwareRasterizer[0] = gl4bcHWAvailable;
                    return GL4bc;
                }
                if( gl3Available && ( gl3HWAvailable || !glAnyHWAvailable ) ) {
                    isHardwareRasterizer[0] = gl3HWAvailable;
                    return GL3;
                }
                if( gl3bcAvailable && ( gl3bcHWAvailable || !glAnyHWAvailable ) ) {
                    isHardwareRasterizer[0] = gl3bcHWAvailable;
                    return GL3bc;
                }
                if( ( desktopCtxUndef || gl2Available ) && ( gl2HWAvailable || !glAnyHWAvailable ) ) {
                    isHardwareRasterizer[0] = gl2HWAvailable;
                    return GL2;
                }
            }
            if( gles3Available && ( gles3HWAvailable || !gles2HWAvailable ) ) {
                isHardwareRasterizer[0] = gles3HWAvailable;
                return GLES3;
            }
            if( gles2Available ) {
                isHardwareRasterizer[0] = gles2HWAvailable;
                return GLES2;
            }
        } else if (GL4ES3 == profile) {
            final boolean gles3CompatAvail = GLContext.isGLES3CompatibleAvailable(device);
            if( desktopCtxUndef || esCtxUndef || gles3CompatAvail ) {
                final boolean es3HardwareRasterizer[] = new boolean[1];
                final boolean gles3Available = hasGLES3Impl && ( esCtxUndef || GLContext.isGLES3Available(device, es3HardwareRasterizer) );
                final boolean gles3HWAvailable = gles3Available && es3HardwareRasterizer[0] ;
                if( hasAnyGL234Impl ) {
                    final boolean gl4bcAvailable = GLContext.isGL4bcAvailable(device, hardwareRasterizer);
                    final boolean gl4bcHWAvailable = gl4bcAvailable && hardwareRasterizer[0] ;
                    final boolean glAnyHWAvailable = gl4bcHWAvailable ||
                                                     gles3HWAvailable;

                    if( GLContext.isGL4Available(device, isHardwareRasterizer) &&
                        ( isHardwareRasterizer[0] || !glAnyHWAvailable ) ) {
                        return GL4;
                    }
                    if( ( desktopCtxUndef || gl4bcAvailable ) && ( gl4bcHWAvailable || !glAnyHWAvailable ) ) {
                        isHardwareRasterizer[0] = gl4bcHWAvailable;
                        return GL4bc;
                    }
                }
                if(gles3Available) {
                    isHardwareRasterizer[0] = es3HardwareRasterizer[0];
                    return GLES3;
                }
            }
        } else if(GL2GL3 == profile) {
            if( hasAnyGL234Impl ) {
                final boolean gl4Available = GLContext.isGL4Available(device, hardwareRasterizer);
                final boolean gl4HWAvailable = gl4Available && hardwareRasterizer[0] ;
                final boolean gl3Available = GLContext.isGL3Available(device, hardwareRasterizer);
                final boolean gl3HWAvailable = gl3Available && hardwareRasterizer[0] ;
                final boolean gl3bcAvailable = GLContext.isGL3bcAvailable(device, hardwareRasterizer);
                final boolean gl3bcHWAvailable = gl3bcAvailable && hardwareRasterizer[0] ;
                final boolean gl2Available = GLContext.isGL2Available(device, hardwareRasterizer);
                final boolean gl2HWAvailable = gl2Available && hardwareRasterizer[0] ;
                final boolean glAnyHWAvailable = gl4HWAvailable || gl3HWAvailable || gl3bcHWAvailable || gl2HWAvailable;

                if( GLContext.isGL4bcAvailable(device, isHardwareRasterizer) &&
                    ( isHardwareRasterizer[0] || !glAnyHWAvailable ) ) {
                    return GL4bc;
                }
                if( gl4Available && ( gl4HWAvailable || !glAnyHWAvailable ) ) {
                    isHardwareRasterizer[0] = gl4HWAvailable;
                    return GL4;
                }
                if( gl3bcAvailable && ( gl3bcHWAvailable || !glAnyHWAvailable ) ) {
                    isHardwareRasterizer[0] = gl3bcHWAvailable;
                    return GL3bc;
                }
                if( gl3Available && ( gl3HWAvailable || !glAnyHWAvailable ) ) {
                    isHardwareRasterizer[0] = gl3HWAvailable;
                    return GL3;
                }
                if( desktopCtxUndef || gl2Available ) {
                    isHardwareRasterizer[0] = gl2HWAvailable;
                    return GL2;
                }
            }
        } else if(GL4bc == profile && hasAnyGL234Impl && ( desktopCtxUndef || GLContext.isGL4bcAvailable(device, isHardwareRasterizer))) {
            return desktopCtxUndef ? GL4bc : GLContext.getAvailableGLProfileName(device, 4, GLContext.CTX_PROFILE_COMPAT);
        } else if(GL4 == profile && hasAnyGL234Impl && ( desktopCtxUndef || GLContext.isGL4Available(device, isHardwareRasterizer))) {
            return desktopCtxUndef ? GL4 : GLContext.getAvailableGLProfileName(device, 4, GLContext.CTX_PROFILE_CORE);
        } else if(GL3bc == profile && hasAnyGL234Impl && ( desktopCtxUndef || GLContext.isGL3bcAvailable(device, isHardwareRasterizer))) {
            return desktopCtxUndef ? GL3bc : GLContext.getAvailableGLProfileName(device, 3, GLContext.CTX_PROFILE_COMPAT);
        } else if(GL3 == profile && hasAnyGL234Impl && ( desktopCtxUndef || GLContext.isGL3Available(device, isHardwareRasterizer))) {
            return desktopCtxUndef ? GL3 : GLContext.getAvailableGLProfileName(device, 3, GLContext.CTX_PROFILE_CORE);
        } else if(GL2 == profile && hasAnyGL234Impl && ( desktopCtxUndef || GLContext.isGL2Available(device, isHardwareRasterizer))) {
            // return desktopCtxUndef ? GL2 : GLContext.getAvailableGLProfileName(device, 2, GLContext.CTX_PROFILE_COMPAT);
            if( desktopCtxUndef ) {
                return GL2;
            } else {
                final String gl2_impl = GLContext.getAvailableGLProfileName(device, 2, GLContext.CTX_PROFILE_COMPAT);
                if( GL3bc == gl2_impl && !GLContext.isGL3bcAvailable(device, isHardwareRasterizer) ) {
                    return GL2;
                } else {
                    return gl2_impl;
                }
            }
        } else if(GLES3 == profile && hasGLES3Impl && ( esCtxUndef || GLContext.isGLES3Available(device, isHardwareRasterizer))) {
            return esCtxUndef ? GLES3 : GLContext.getAvailableGLProfileName(device, 3, GLContext.CTX_PROFILE_ES);
        } else if(GLES2 == profile && hasGLES3Impl && ( esCtxUndef || GLContext.isGLES2Available(device, isHardwareRasterizer))) {
            return esCtxUndef ? GLES2 : GLContext.getAvailableGLProfileName(device, 2, GLContext.CTX_PROFILE_ES);
        } else if(GLES1 == profile && hasGLES1Impl && ( esCtxUndef || GLContext.isGLES1Available(device, isHardwareRasterizer))) {
            return esCtxUndef ? GLES1 : GLContext.getAvailableGLProfileName(device, 1, GLContext.CTX_PROFILE_ES);
        }
        return null;
    }

    private static /*final*/ HashMap<String /*device_connection*/, HashMap<String /*GLProfile_name*/, GLProfile>> deviceConn2ProfileMap =
                new HashMap<String /*device_connection*/, HashMap<String /*GLProfile_name*/, GLProfile>>();

    /**
     * This implementation support lazy initialization, while avoiding recursion/deadlocks.<br>
     * If no mapping 'device -> GLProfiles-Map' exists yet, it triggers<br>
     *  - create empty mapping device -> GLProfiles-Map <br>
     *  - initialization<br<
     *
     * @param device the key 'device -> GLProfiles-Map'
     * @param throwExceptionOnZeroProfile true if <code>GLException</code> shall be thrown in case of no mapped profile, otherwise false.
     * @return the GLProfile HashMap if exists, otherwise null
     * @throws GLException if no profile for the given device is available.
     */
    private static HashMap<String /*GLProfile_name*/, GLProfile> getProfileMap(AbstractGraphicsDevice device, final boolean throwExceptionOnZeroProfile)
        throws GLException
    {
        initSingleton();

        if(null==defaultDevice) { // avoid NPE and notify of incomplete initialization
            throw new GLException("No default device available");
        }

        if(null==device) {
            device = defaultDevice;
        }

        final String deviceKey = device.getUniqueID();
        HashMap<String /*GLProfile_name*/, GLProfile> map = deviceConn2ProfileMap.get(deviceKey);
        if( null != map ) {
            return map;
        }
        if( !initProfilesForDevice(device) ) {
            if( throwExceptionOnZeroProfile ) {
                throw new GLException("No Profile available for "+device);
            } else {
                return null;
            }
        }
        map = deviceConn2ProfileMap.get(deviceKey);
        if( null == map && throwExceptionOnZeroProfile ) {
            throw new InternalError("initProfilesForDevice(..) didn't setProfileMap(..) for "+device);
        }
        return map;
    }

    private static void setProfileMap(final AbstractGraphicsDevice device, final HashMap<String /*GLProfile_name*/, GLProfile> mappedProfiles) {
        synchronized ( deviceConn2ProfileMap ) {
            deviceConn2ProfileMap.put(device.getUniqueID(), mappedProfiles);
        }
    }

    private GLProfile(final String profile, final GLProfile profileImpl, final boolean isHardwareRasterizer, final boolean isCustom) {
        this.profile = profile;
        this.profileImpl = profileImpl;
        this.isHardwareRasterizer = isHardwareRasterizer;
        this.isCustom = isCustom;
    }

    public static GLProfile createCustomGLProfile(final String profile, final GLProfile profileImpl) {
        return new GLProfile(profile, profileImpl, profileImpl.isHardwareRasterizer, true);
    }

    private final GLProfile profileImpl;
    private final String profile;
    private final boolean isHardwareRasterizer;
    private final boolean isCustom;
}
