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

import java.io.File;
import java.net.MalformedURLException;

import java.net.URL;

import javax.vecmath.Matrix4f;
import javax.vecmath.Vector3f;

import javax.media.opengl.GLCapabilities;

// Local imports
import org.j3d.aviatrix3d.*;

import org.j3d.aviatrix3d.output.graphics.SimpleAWTSurface;
import org.j3d.aviatrix3d.output.graphics.DebugAWTSurface;
import org.j3d.aviatrix3d.pipeline.graphics.GraphicsCullStage;
import org.j3d.aviatrix3d.pipeline.graphics.DefaultGraphicsPipeline;
import org.j3d.aviatrix3d.pipeline.graphics.GraphicsOutputDevice;
import org.j3d.aviatrix3d.pipeline.graphics.NullCullStage;
import org.j3d.aviatrix3d.pipeline.graphics.NullSortStage;
import org.j3d.aviatrix3d.pipeline.graphics.GraphicsSortStage;
import org.j3d.aviatrix3d.rendering.SingleThreadRenderManager;

/**
 * Example application that demonstrates a very basic 2-pass multipass
 * rendering. Pass 1 draws a red triangle on the left, pass 2 draws a blue
 * triangle on the right.
 *
 * @author Justin Couch
 * @version $Revision: 1.1 $
 */
public class BasicMultipassDemo extends Frame
    implements WindowListener
{
    /** Manager for the scene graph handling */
    private SingleThreadRenderManager sceneManager;

    /** Our drawing surface */
    private GraphicsOutputDevice surface;

    public BasicMultipassDemo()
    {
        super("Basic Aviatrix 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);
    }

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

        GraphicsCullStage culler = new NullCullStage();
        culler.setOffscreenCheckEnabled(false);

        GraphicsSortStage sorter = new NullSortStage();
        surface = new DebugAWTSurface(caps);
        DefaultGraphicsPipeline pipeline = new DefaultGraphicsPipeline();

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

        // Render manager
        sceneManager = new SingleThreadRenderManager();
        sceneManager.addPipeline(pipeline);
        sceneManager.setGraphicsOutputDevice(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 };
        float[] normal = { 0, 0, 1, 0, 0, 1, 0, 0, 1 };
        float[] color1 = { 1, 0, 0, 1, 0, 0, 1, 0, 0 };
        float[] color2 = { 0, 0, 1, 0, 0, 1, 0, 0, 1 };

        TriangleArray geom = new TriangleArray();
        geom.setValidVertexCount(3);
        geom.setVertices(TriangleArray.COORDINATE_3, coord);
        geom.setNormals(normal);
        geom.setColors(false, color1);

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

        trans.set(-0.2f, 0, 0);
        Matrix4f mat2 = new Matrix4f();
        mat2.setIdentity();
        mat2.setTranslation(trans);

        TransformGroup shape_transform = new TransformGroup();
        shape_transform.addChild(shape);
        shape_transform.setTransform(mat2);

        scene_root.addChild(shape_transform);

        RenderPass pass1 = new RenderPass();
        pass1.setRenderedGeometry(scene_root);
        pass1.setActiveView(vp);

        // And now the second pass - a blue triangle on the right
        vp = new Viewpoint();

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

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

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

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

        geom = new TriangleArray();
        geom.setValidVertexCount(3);
        geom.setVertices(TriangleArray.COORDINATE_3, coord);
        geom.setNormals(normal);
        geom.setColors(false, color2);

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

        trans.set(0.2f, 0, 0);
        mat2 = new Matrix4f();
        mat2.setIdentity();
        mat2.setTranslation(trans);

        shape_transform = new TransformGroup();
        shape_transform.addChild(shape);
        shape_transform.setTransform(mat2);

        scene_root.addChild(shape_transform);

        RenderPass pass2 = new RenderPass();
        pass2.setRenderedGeometry(scene_root);
        pass2.setActiveView(vp);


        MultipassScene scene = new MultipassScene();
        scene.addRenderPass(pass1);
        scene.addRenderPass(pass2);

        // Then the basic layer and viewport at the top:
        MultipassViewport view = new MultipassViewport();
        view.setDimensions(0, 0, 500, 500);
        view.setScene(scene);

        SimpleLayer layer = new SimpleLayer();
        layer.setViewport(view);

        Layer[] layers = { layer };
        sceneManager.setLayers(layers, 1);
    }

    //---------------------------------------------------------------
    // 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)
    {
        sceneManager.shutdown();
        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
    //---------------------------------------------------------------

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