/*
 * Copyright(c) 2006 the Spark project.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, 
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */

package
{
    import org.libspark.geom.Matrix4;
    import org.libspark.geom.Vector3D;
    import org.libspark.geom.Vector4D;
    import org.libspark.thunder.*;
    import flash.display.Sprite;
    import flash.text.TextField;
    import flash.events.Event;
    import flash.utils.getTimer;
    
    public class Demo extends Sprite
    {
        private var render:Render;
        private var worldMatrix:Matrix4;
        private var vertices:Array;
        private var indices:Array;
        private var len:uint;
        private var fps:uint;
        private var fpsField:TextField;
        private var rx:Number;
        private var ry:Number;
        private var rz:Number;
        
        public function Demo()
        {
            stage.scaleMode = 'noScale';
            
            render = new Render();
            render.setRenderTarget(graphics);
            
            worldMatrix = new Matrix4();
            render.setWorldMatrix(worldMatrix);
            
            var view:Matrix4 = new Matrix4();
            var vCam:Vector3D = new Vector3D(0, 0, 3);
            var vCamEye:Vector3D = new Vector3D(0, 0, 0);
            var vCamTop:Vector3D = new Vector3D(0, 1, 0);
            var camDiv:Number = 0.1;
            MatrixUtil.lookAt(view, vCam, vCamEye, vCamTop);
            render.setViewMatrix(view);
            
            var projection:Matrix4 = new Matrix4();
            MatrixUtil.perspective(projection, 60 * Math.PI / 180, 3 / 4, 0.01, 100);
            render.setProjectionMatrix(projection);
            
            var d:Vector3D = new Vector3D(0, -5, -5);
            d.normalize();
            render.setLight(new Light(d, new ColorValue(0.3, 0.3, 0.3), new ColorValue(0.7, 0.7, 0.7)));
            render.setViewport(new Viewport(0, 0, 320, 240));
            
            var shape:Object = SimpleShape.createDonuts(23);
            vertices = shape.vertices;
            indices = shape.indices;
            len = indices.length / 3;
            
            fpsField = new TextField();
            fpsField.x = 240;
            fpsField.y = 0;
            addChild(fpsField);
            
            fps = getTimer();
            
            rx = ry = rz = 0;
            
            addEventListener(Event.ENTER_FRAME, enterFrameHandler);
        }
        
        private function enterFrameHandler(event:Event):void
        {
            var m:Matrix4 = worldMatrix;
            var r:Render = render;
            
            m.identity();
            m.rotateX(rx += 0.01);
            m.rotateY(ry += 0.02);
            m.rotateZ(rz += 0.05);
            
            r.updateMatrix();
            r.clear();
            r.beginScene();
            r.drawIndexedPrimitive(indices, vertices, len);
            var poly:uint = r.endScene();
            r.present();
            
            fpsField.text = Math.floor(1000 / (getTimer() - fps)) + 'fps; ' + poly + 'polygons';
            fps = getTimer();
        }
    }
}