/*
 * Copyright (c) 2008 Sun Microsystems, Inc. All Rights Reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
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 * - Redistribution of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
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 * - 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
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 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
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 */

package demos.cubefbo;

import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.media.opengl.DebugGL2;
import javax.media.opengl.GL;
import javax.media.opengl.GL2ES1;
import javax.media.opengl.GL2;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.awt.GLCanvas;
import com.sun.opengl.util.FBObject;



class FBCubes implements GLEventListener, MouseListener, MouseMotionListener {

    private static final int FBO_SIZE = 128;

    public FBCubes () {
        cubeInner = new CubeObject(false);
        cubeMiddle = new CubeObject(true);
        cubeOuter = new CubeObject(true);
        fbo1 = new FBObject(FBO_SIZE, FBO_SIZE, 0);
        fbo2 = new FBObject(FBO_SIZE, FBO_SIZE, 0);
    }

    public void init(GLAutoDrawable drawable) {
        GL2 gl = drawable.getGL().getGL2();
        // drawable.setGL(new DebugGL2(gl));
        // gl = drawable.getGL().getGL2();
        fbo1.init(gl);
        fbo2.init(gl);
    }

    int x, y, width, height;
    float motionIncr;
    float xRot, yRot;

    public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
        cubeOuter.reshape(drawable.getGL().getGL2(), x, y, width, height);
        motionIncr = 180.f / Math.max(width, height);
    }

    public void dispose(GLAutoDrawable drawable) {
        System.out.println("FBCubes.dispose: "+drawable);
        GL2 gl = drawable.getGL().getGL2();
        fbo1.destroy(gl);
        fbo2.destroy(gl);
        fbo1=null; fbo2=null;
        cubeInner.dispose(gl);
        cubeInner=null;
        cubeMiddle.dispose(gl);
        cubeMiddle=null;
        cubeOuter.dispose(gl);
        cubeOuter=null;
    }

    public void display(GLAutoDrawable drawable) {
        //        System.out.println("display");
        GL2 gl = drawable.getGL().getGL2();

        fbo1.bind(gl);
        cubeInner.reshape(gl, 0, 0, FBO_SIZE, FBO_SIZE);
        cubeInner.display(gl, xRot, yRot);
        fbo1.unbind(gl);

        FBObject tex = fbo1;
        FBObject rend = fbo2;

        int MAX_ITER = 1;

        for (int i = 0; i < MAX_ITER; i++) {
            rend.bind(gl);
            gl.glEnable (GL.GL_TEXTURE_2D);
            gl.glBindTexture(GL.GL_TEXTURE_2D, tex.getTextureName()); // to use it ..
            cubeMiddle.reshape(gl, 0, 0, FBO_SIZE, FBO_SIZE);
            cubeMiddle.display(gl, xRot, yRot);
            gl.glBindTexture(GL.GL_TEXTURE_2D, 0);
            gl.glDisable (GL.GL_TEXTURE_2D);
            rend.unbind(gl);
            FBObject tmp = tex;
            tex = rend;
            rend = tmp;
        }

        //        System.out.println("display .. p6");
        cubeOuter.reshape(gl, x, y, width, height);
        //        System.out.println("display .. p7");

        gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
        gl.glClearColor(0, 0, 0, 1);

        gl.glEnable (GL.GL_TEXTURE_2D);
        gl.glBindTexture(GL.GL_TEXTURE_2D, tex.getTextureName()); // to use it ..
        cubeOuter.display(gl, xRot, yRot);
        //        System.out.println("display .. p8");
        gl.glBindTexture(GL.GL_TEXTURE_2D, 0);
        gl.glDisable (GL.GL_TEXTURE_2D);
    }

    public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged) {
    }
    
    private boolean dragging;
    private int lastDragX;
    private int lastDragY;

    public void mouseClicked(MouseEvent e)  {}
    public void mousePressed(MouseEvent e)  {}
    public void mouseReleased(MouseEvent e) {
        dragging = false;
    }
    public void mouseEntered(MouseEvent e)  {}
    public void mouseExited(MouseEvent e)   {}
    public void mouseDragged(MouseEvent e)  {
        if (!dragging) {
            dragging = true;
            lastDragX = e.getX();
            lastDragY = e.getY();
        } else {
            yRot += (e.getX() - lastDragX) * motionIncr;
            xRot += (e.getY() - lastDragY) * motionIncr;
            lastDragX = e.getX();
            lastDragY = e.getY();
        }
    }
    public void mouseMoved(MouseEvent e)    {}

    CubeObject cubeInner;
    CubeObject cubeMiddle;
    CubeObject cubeOuter;
    FBObject   fbo1;
    FBObject   fbo2;
}