// Standard imports
import java.awt.*;
import java.awt.event.*;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.FileInputStream;
import java.io.BufferedInputStream;

import java.net.URL;

import javax.imageio.ImageIO;
import javax.vecmath.Matrix4f;
import javax.vecmath.Vector3f;

import net.java.games.jogl.GLCapabilities;

// Application Specific imports
import org.j3d.aviatrix3d.*;

import org.j3d.aviatrix3d.pipeline.NullCullStage;
import org.j3d.aviatrix3d.pipeline.NullSortStage;
import org.j3d.aviatrix3d.pipeline.DefaultRenderPipeline;
import org.j3d.aviatrix3d.pipeline.SingleThreadRenderManager;
import org.j3d.aviatrix3d.surface.SimpleAWTSurface;

/**
 * Example application that demonstrates how to put together a single-threaded
 * rendering system.
 *
 * @author Justin Couch
 * @version $Revision: 1.4 $
 */
public class SimpleRenderToTextureDemo extends Frame
    implements WindowListener, Runnable
{
    /** Manager for the scene graph handling */
    private SingleThreadRenderManager sceneManager;

    /** Our drawing surface */
    private DrawableSurface surface;

    public SimpleRenderToTextureDemo()
    {
        super("Aviatrix Render To Texture Demo");

        setLayout(new BorderLayout());
        addWindowListener(this);

        setupAviatrix();
        setupSceneGraph();

        setSize(600, 600);
        setLocation(40, 40);

        // Need to set visible first before starting the rendering thread due
        // to a bug in JOGL. See JOGL Issue #54 for more information on this.
        // http://jogl.dev.java.net
        setVisible(true);

        Runtime system_runtime = Runtime.getRuntime();
        system_runtime.addShutdownHook(new Thread(this));
    }

    /**
     * Setup the avaiatrix pipeline here
     */
    private void setupAviatrix()
    {
        // Assemble a simple single-threaded pipeline.
        GLCapabilities caps = new GLCapabilities();
        caps.setDoubleBuffered(true);
        caps.setHardwareAccelerated(true);

        CullStage culler = new NullCullStage(2);
        culler.setOffscreenCheckEnabled(true);

        SortStage sorter = new NullSortStage();
        surface = new SimpleAWTSurface(caps);
        surface.setClearColor(1, 0, 0, 1);
        DefaultRenderPipeline pipeline = new DefaultRenderPipeline();

        pipeline.setCuller(culler);
        pipeline.setSorter(sorter);
        pipeline.setDrawableSurface(surface);

        // Render manager
        sceneManager = new SingleThreadRenderManager();
        sceneManager.addPipeline(pipeline);
        sceneManager.setDrawableSurface(surface);
        sceneManager.setMinimumFrameInterval(100);

        // Before putting the pipeline into run mode, put the canvas on
        // screen first.
        Component comp = (Component)surface.getSurfaceObject();
        add(comp, BorderLayout.CENTER);
    }

    /**
     * Setup the basic scene which consists of a quad and a viewpoint
     */
    private void setupSceneGraph()
    {
        // View group
        Viewpoint vp = new Viewpoint();

        Vector3f trans = new Vector3f(0, 0, 1);

        Matrix4f mat = new Matrix4f();
        mat.setIdentity();
        mat.setTranslation(trans);

        TransformGroup tx = new TransformGroup();
        tx.addChild(vp);
        tx.setTransform(mat);

        Group scene_root = new Group();
        scene_root.addChild(tx);

        // Flat panel that has the viewable object as the demo
        float[] coord = { 0, 0, -1,     0.25f, 0, -1,     0, 0.25f, -1,
                          0.25f, 0, -1, 0.25f, 0.25f, -1, 0, 0.25f, -1,
                          0.25f, 0, -1, 0.5f, 0, -1,      0.25f, 0.25f, -1,
                          0.5f, 0, -1,  0.5f, 0.25f, -1,  0.25f, 0.25f, -1 };

        float[] normal = { 0, 0, 1, 0, 0, 1, 0, 0, 1,
                           0, 0, 1, 0, 0, 1, 0, 0, 1,
                           0, 0, 1, 0, 0, 1, 0, 0, 1,
                           0, 0, 1, 0, 0, 1, 0, 0, 1};
        float[][] tex_coord = { { 0, 0,  1, 0,  0, 1,   1, 0,  1, 1, 0, 1,
                                  0, 0,  1, 0,  0, 1,   1, 0,  1, 1, 0, 1 } };
        int[] tex_type = { VertexGeometry.TEXTURE_COORDINATE_2 };

        TriangleArray geom = new TriangleArray();
        geom.setVertices(TriangleArray.COORDINATE_3, coord, 6);
        geom.setTextureCoordinates(tex_type, tex_coord, 1);

        Material material = new Material();
        material.setDiffuseColor(new float[] { 0, 0, 1 });
        material.setEmissiveColor(new float[] { 0, 0, 1 });
        material.setSpecularColor(new float[] { 1, 1, 1 });

        Appearance app = new Appearance();
//        app.setMaterial(material);

        // The texture requires its own set of capabilities.
        GLCapabilities caps = new GLCapabilities();
        caps.setDoubleBuffered(false);
        caps.setOffscreenRenderToTexture(true);

        OffscreenTexture2D texture = new OffscreenTexture2D(caps, 128, 128);
        setupTextureSceneGraph(texture);

        TextureUnit[] tu = new TextureUnit[1];
        tu[0] = new TextureUnit();
        tu[0].setTexture(texture);

        app.setTextureUnits(tu, 1);

        Shape3D shape = new Shape3D();
        shape.setGeometry(geom);
        shape.setAppearance(app);

        scene_root.addChild(shape);

        Scene scene = new Scene();
        scene.setRenderedGeometry(scene_root);
        scene.setActiveView(vp);

        sceneManager.setScene(scene);
    }

    /**
     * Convenience method to set up the details of the texture.
     */
    private void setupTextureSceneGraph(OffscreenTexture2D texture)
    {
        texture.setClearColor(0, 1, 0, 1);

        Group scene_root = new Group();

        TransformGroup grp = new TransformGroup();

        Vector3f trans = new Vector3f(0, 0, 1);

        Matrix4f mat = new Matrix4f();
        mat.setIdentity();
        mat.setScale(10);
        mat.setTranslation(trans);

        // Flat panel that has the viewable object as the demo
        float[] coord = { 0, 0, -1,     0.5f, 0, -1,     0, 0.5f, -1,
                          0.5f, 0, -1, 0.5f, 0.5f, -1, 0, 0.5f, -1 };

        float[] color = { 0, 0, 1, 0, 1, 0, 1, 0, 0,
                          0, 1, 1, 0, 1, 1, 1, 0, 1 };

        float[] normal = { 0, 0, 1, 0, 0, 1, 0, 0, 1,
                           0, 0, 1, 0, 0, 1, 0, 0, 1,
                           0, 0, 1, 0, 0, 1, 0, 0, 1,
                           0, 0, 1, 0, 0, 1, 0, 0, 1};
        float[][] tex_coord = { { 0, 0,  1, 0,  0, 1,   1, 0,  1, 1, 0, 1,
                                  0, 0,  1, 0,  0, 1,   1, 0,  1, 1, 0, 1 } };
        int[] tex_type = { VertexGeometry.TEXTURE_COORDINATE_2 };

        TriangleArray geom = new TriangleArray();
        geom.setVertices(TriangleArray.COORDINATE_3, coord, 6);
        geom.setTextureCoordinates(tex_type, tex_coord, 1);
        geom.setColors(false, color);

        Material material = new Material();
        material.setDiffuseColor(new float[] { 0, 0, 1 });
        material.setEmissiveColor(new float[] { 0, 0, 1 });
        material.setSpecularColor(new float[] { 1, 1, 1 });

        Appearance app = new Appearance();
//        app.setMaterial(material);

        Shape3D shape = new Shape3D();
        shape.setGeometry(geom);
        shape.setAppearance(app);

//        grp.setTransform(mat);
        grp.addChild(shape);

        // Give the texture it's own separate viewpoint.
        Viewpoint vp = new Viewpoint();

        trans.set(0, 0.5f, -0.5f);

        mat = new Matrix4f();
        mat.setIdentity();
        mat.setTranslation(trans);

        TransformGroup vp_grp = new TransformGroup();
        vp_grp.setTransform(mat);
        vp_grp.addChild(vp);

        scene_root.addChild(grp);
        scene_root.addChild(vp_grp);

        Scene scene = new Scene();
        scene.setRenderedGeometry(scene_root);
        scene.setActiveView(vp);

        texture.setRenderedScene(scene);
        texture.setRepaintRequired(true);
    }

    //---------------------------------------------------------------
    // Methods defined by Runnable
    //---------------------------------------------------------------

    /**
     * Run method for the shutdown hook. This is to deal with someone using
     * ctrl-C to kill the application. Makes sure that all the resources
     * are cleaned up properly.
     */
    public void run()
    {
        shutdownApp();
    }

    //---------------------------------------------------------------
    // Methods defined by WindowListener
    //---------------------------------------------------------------

    /**
     * Ignored
     */
    public void windowActivated(WindowEvent evt)
    {
    }

    /**
     * Ignored
     */
    public void windowClosed(WindowEvent evt)
    {
    }

    /**
     * Exit the application
     *
     * @param evt The event that caused this method to be called.
     */
    public void windowClosing(WindowEvent evt)
    {
        shutdownApp();
        System.exit(0);
    }

    /**
     * Ignored
     */
    public void windowDeactivated(WindowEvent evt)
    {
    }

    /**
     * Ignored
     */
    public void windowDeiconified(WindowEvent evt)
    {
    }

    /**
     * Ignored
     */
    public void windowIconified(WindowEvent evt)
    {
    }

    /**
     * When the window is opened, start everything up.
     */
    public void windowOpened(WindowEvent evt)
    {
        sceneManager.setEnabled(true);
    }

    //---------------------------------------------------------------
    // Local methods
    //---------------------------------------------------------------

    /**
     * Close down the application safely by destroying all the resources
     * currently in use.
     */
    private void shutdownApp()
    {
        sceneManager.setEnabled(false);
        surface.dispose();
    }

    public static void main(String[] args)
    {
        SimpleRenderToTextureDemo demo = new SimpleRenderToTextureDemo();
        demo.setVisible(true);
    }
}