// External imports
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

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

import javax.media.opengl.GLCapabilities;

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;

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

import org.j3d.aviatrix3d.output.graphics.SimpleSWTSurface;
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.management.SingleThreadRenderManager;
import org.j3d.aviatrix3d.management.SingleDisplayCollection;

/**
 * Example application that demonstrates how to put together a single-threaded
 * rendering system.
 *
 * @author Justin Couch
 * @version $Revision: 1.7 $
 */
public class AnimationDemo
{
    /** Manager for the scene graph handling */
    private SingleThreadRenderManager sceneManager;

    /** Manager for the layers etc */
    private SingleDisplayCollection displayManager;

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

    /**
     * Create a new demo instance.
     *
     * @param parent The parent widget of the display
     */
    public AnimationDemo(Shell parent)
    {
        setupAviatrix(parent);
        setupSceneGraph();

        sceneManager.setEnabled(true);
    }

    /**
     * Setup the avaiatrix pipeline here
     */
    private void setupAviatrix(Shell parent)
    {
        // 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 SimpleSWTSurface(parent, SWT.NONE, caps);
        DefaultGraphicsPipeline pipeline = new DefaultGraphicsPipeline();

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

        displayManager = new SingleDisplayCollection();
        displayManager.addPipeline(pipeline);

        // Render manager
        sceneManager = new SingleThreadRenderManager();
        sceneManager.addDisplay(displayManager);
        sceneManager.setMinimumFrameInterval(100);
    }

    /**
     * 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[] color = { 0, 0, 1, 0, 1, 0, 1, 0, 0 };

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

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

        trans.set(0.5f, 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);

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

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

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

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

        RotationAnimation anim = new RotationAnimation(shape_transform);
        sceneManager.setApplicationObserver(anim);
    }

    /**
     * Cause the rendering cycle to exit now.
     */
    public void shutdown()
    {
        sceneManager.shutdown();
    }

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

    public static void main(String[] args)
    {
        Shell shell = new Shell();
        shell.setLayout(new FillLayout());
        AnimationDemo demo = new AnimationDemo(shell);

        shell.setSize (640, 480);
        shell.setText("Basic AV3D Animation + SWT Demo");
        shell.open();

        Display display = shell.getDisplay();

        while(!shell.isDisposed())
        {
            if(!display.readAndDispatch())
                display.sleep();
        }

        demo.shutdown();
        display.dispose();
    }
}