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Java™ Binding for the OpenGL® API
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/*
 * Copyright (c) 2008 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.
 */

package com.jogamp.nativewindow.egl;

import com.jogamp.common.util.VersionNumber;
import com.jogamp.nativewindow.AbstractGraphicsDevice;
import com.jogamp.nativewindow.DefaultGraphicsDevice;
import com.jogamp.nativewindow.NativeWindowException;
import com.jogamp.nativewindow.NativeWindowFactory;

/** Encapsulates a graphics device on EGL platforms.
 */
public class EGLGraphicsDevice extends DefaultGraphicsDevice implements Cloneable {
    private final long[] nativeDisplayID = new long[1];
    private /* final */ EGLDisplayLifecycleCallback eglLifecycleCallback;
    private VersionNumber eglVersion = VersionNumber.zeroVersion;

    /**
     * Hack to allow inject a EGL termination call.
     * 
     * FIXME: This shall be removed when relocated EGL to the nativewindow package,
     * since then it can be utilized directly.
     * 
     */
    public interface EGLDisplayLifecycleCallback {
        /**
         * Implementation should issue an EGL.eglGetDisplay(nativeDisplayID)
         * inclusive EGL.eglInitialize(eglDisplayHandle, ..) call.
         * @param nativeDisplayID in/out array of size 1, passing the requested nativeVisualID, may return a different revised nativeVisualID handle
         * @param major out array for EGL major version
         * @param minor out array for EGL minor version
         * @return the initialized EGL display ID, or 0 if not successful
         */
        public long eglGetAndInitDisplay(final long[] nativeDisplayID, final int[] major, final int[] minor);

        /**
         * Implementation should issue an EGL.eglTerminate(eglDisplayHandle) call.
         * @param eglDisplayHandle
         */
        void eglTerminate(long eglDisplayHandle);
    }

    /**
     * Note that this is not an open connection, ie no native display handle exist.
     * This constructor exist to setup a default device connection/unit.

     */
    public EGLGraphicsDevice() {
        super(NativeWindowFactory.TYPE_EGL, DefaultGraphicsDevice.getDefaultDisplayConnection(), AbstractGraphicsDevice.DEFAULT_UNIT);
        this.nativeDisplayID[0] = 0 ; // EGL.EGL_DEFAULT_DISPLAY
        this.eglLifecycleCallback = null;
    }

    public EGLGraphicsDevice(final AbstractGraphicsDevice aDevice, final long eglDisplay, final EGLDisplayLifecycleCallback eglLifecycleCallback) {
        super(NativeWindowFactory.TYPE_EGL, aDevice.getConnection(), aDevice.getUnitID(), eglDisplay);
        final long nativeDisplayID;
        if( aDevice instanceof EGLGraphicsDevice ) {
            nativeDisplayID = ((EGLGraphicsDevice)aDevice).getNativeDisplayID();
        } else {
            nativeDisplayID = aDevice.getHandle();
        }
        this.nativeDisplayID[0] = nativeDisplayID;
        this.eglLifecycleCallback = eglLifecycleCallback;
    }

    public EGLGraphicsDevice(final long nativeDisplayID, final long eglDisplay, final String connection, final int unitID, final EGLDisplayLifecycleCallback eglLifecycleCallback) {
        super(NativeWindowFactory.TYPE_EGL, connection, unitID, eglDisplay);
        this.nativeDisplayID[0] = nativeDisplayID;
        this.eglLifecycleCallback = eglLifecycleCallback;
    }

    /** EGL server version as returned by {@code eglInitialize(..)}. Only valid after {@link #open()}. */
    public VersionNumber getEGLVersion() { return eglVersion; }

    public long getNativeDisplayID() { return nativeDisplayID[0]; }

    @Override
    public Object clone() {
      return super.clone();
    }

    /**
     * Opens the EGL device if handle is null and it's {@link EGLDisplayLifecycleCallback} is valid.
     * 
     * {@inheritDoc}
     * 
     */
    @Override
    public boolean open() {
        if(null != eglLifecycleCallback && 0 == handle) {
            if(DEBUG) {
                System.err.println(Thread.currentThread().getName() + " - EGLGraphicsDevice.open(): "+this);
            }
            final int[] major = { 0 };
            final int[] minor = { 0 };
            handle = eglLifecycleCallback.eglGetAndInitDisplay(nativeDisplayID, major, minor);
            if(0 == handle) {
                eglVersion = VersionNumber.zeroVersion;
                throw new NativeWindowException("EGLGraphicsDevice.open() failed: "+this);
            } else {
                eglVersion = new VersionNumber(major[0], minor[0], 0);
                return true;
            }
        }
        return false;
    }

    /**
     * Closes the EGL device if handle is not null and it's {@link EGLDisplayLifecycleCallback} is valid.
     * 
     * {@inheritDoc}
     * 
     */
    @Override
    public boolean close() {
        if(null != eglLifecycleCallback && 0 != handle) {
            if(DEBUG) {
                System.err.println(Thread.currentThread().getName() + " - EGLGraphicsDevice.close(): "+this);
            }
            eglLifecycleCallback.eglTerminate(handle);
        }
        return super.close();
    }

    @Override
    public boolean isHandleOwner() {
        return null != eglLifecycleCallback;
    }
    @Override
    public void clearHandleOwner() {
        eglLifecycleCallback = null;
    }
    @Override
    protected Object getHandleOwnership() {
        return eglLifecycleCallback;
    }
    @Override
    protected Object setHandleOwnership(final Object newOwnership) {
        final EGLDisplayLifecycleCallback oldOwnership = eglLifecycleCallback;
        eglLifecycleCallback = (EGLDisplayLifecycleCallback) newOwnership;
        return oldOwnership;
    }

    @Override
    public String toString() {
        return getClass().getSimpleName()+"[type "+getType()+", v"+eglVersion+", connection "+getConnection()+", unitID "+getUnitID()+", handle 0x"+Long.toHexString(getHandle())+", owner "+isHandleOwner()+", "+toolkitLock+"]";
    }
}