/*
 * 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
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 * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
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 */

package demos.readbuffer;

import java.nio.*;
import javax.media.opengl.*;

import com.sun.opengl.util.texture.Texture;
import com.sun.opengl.util.texture.TextureData;
import com.sun.opengl.util.BufferUtil;


public class ReadBufferBase implements GLEventListener {
    public boolean glDebug = false ;
    public boolean glTrace = false ;

    protected GLDrawable externalRead;

    ReadBufferUtil readBufferUtil = new ReadBufferUtil();

    public ReadBufferBase (GLDrawable externalRead) {
        this.externalRead = externalRead ;
    }

    public void init(GLAutoDrawable drawable) {
        GL _gl = drawable.getGL();

        _gl.glGetError(); // flush error ..

        if(glDebug) {
            try {
                _gl = _gl.getContext().setGL( GLPipelineFactory.create("javax.media.opengl.Debug", null, _gl, null) );
            } catch (Exception e) {e.printStackTrace();} 
        }

        if(glTrace) {
            try {
                _gl = _gl.getContext().setGL( GLPipelineFactory.create("javax.media.opengl.Trace", null, _gl, new Object[] { System.err } ) );
            } catch (Exception e) {e.printStackTrace();} 
        }

        System.out.println(_gl);

        _gl.getContext().setGLDrawableRead(externalRead);
        if(_gl.isGL2GL3()) {
            _gl.getGL2GL3().glReadBuffer(GL2GL3.GL_FRONT);
        }
        System.out.println("---------------------------");
        System.out.println(_gl.getContext());
        System.out.println("---------------------------");
    }

    public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
    }

    public void dispose(GLAutoDrawable drawable) {
        readBufferUtil.dispose();
    }

    public void display(GLAutoDrawable drawable) {
        GL gl = drawable.getGL();

        readBufferUtil.fetchOffscreenTexture(drawable, gl);
    }

}