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package org.papervision3d.materials.shadematerials
{
	import flash.display.BitmapData;
	import flash.display.Graphics;
	import flash.geom.Matrix;
	
	import org.papervision3d.core.geom.renderables.Triangle3D;
	import org.papervision3d.core.geom.renderables.Vertex3DInstance;
	import org.papervision3d.core.material.AbstractSmoothShadeMaterial;
	import org.papervision3d.core.math.Matrix3D;
	import org.papervision3d.core.proto.LightObject3D;
	import org.papervision3d.core.render.command.RenderTriangle;
	import org.papervision3d.core.render.data.RenderSessionData;
	import org.papervision3d.core.render.draw.ITriangleDrawer;
	
	/**
	 * @Author Ralph Hauwert
	 */
	public class EnvMapMaterial extends AbstractSmoothShadeMaterial implements ITriangleDrawer
	{
		private static var p0:Number;
		private static var q0:Number;
		private static var p1:Number;
		private static var q1:Number;		
		private static var p2:Number;
		private static var q2:Number;
		private static var v0:Vertex3DInstance;
		private static var v1:Vertex3DInstance;
		private static var v2:Vertex3DInstance;
		private static var x1:Number;
		private static var x0:Number;
		private static var x2:Number;
		private static var y0:Number;
		private static var y1:Number;
		private static var y2:Number;
		
		
		protected var lightmapHalfheight:Number;
		protected var lightmapHalfwidth:Number;
		public var _lightMap:BitmapData;
		public var backenvmap:BitmapData;
		
		public function EnvMapMaterial(light:LightObject3D, lightMap:BitmapData, backEnvMap:BitmapData=null, ambientColor:int = 0)
		{
			super();
			this.light = light;
			this.lightMap = lightMap;
			if(!backenvmap){
				this.backenvmap = new BitmapData(1,1,false, ambientColor);
			}else{
				this.backenvmap = backenvmap;
			}
		}
		
		/**
		 * Localized stuff.
		 */
		private static var useMap:BitmapData;
		override public function drawTriangle(tri:RenderTriangle, graphics:Graphics, renderSessionData:RenderSessionData, altBitmap:BitmapData = null, altUV:Matrix = null):void
		{
			var face3D:Triangle3D = tri.triangle;
			lightMatrix = Matrix3D(lightMatrices[face3D.instance]);
			
			
			/*
			v0 = triangle.v0.vertex3DInstance;
			v1 = triangle.v1.vertex3DInstance;
			v2 = triangle.v2.vertex3DInstance;
			triangle.v0.normal.copyTo(v0.normal);
			triangle.v1.normal.copyTo(v1.normal);
			triangle.v2.normal.copyTo(v2.normal);
			Matrix3D.multiplyVector3x3(lm, v0.normal);
			Matrix3D.multiplyVector3x3(lm, v1.normal);
			Matrix3D.multiplyVector3x3(lm, v2.normal);
			*/
			
			p0 = lightmapHalfwidth*(face3D.v0.normal.x * lightMatrix.n11 + face3D.v0.normal.y * lightMatrix.n12 + face3D.v0.normal.z * lightMatrix.n13)+lightmapHalfwidth;
			q0 = lightmapHalfheight*(face3D.v0.normal.x * lightMatrix.n21 + face3D.v0.normal.y * lightMatrix.n22 + face3D.v0.normal.z * lightMatrix.n23)+lightmapHalfheight;
			p1 = lightmapHalfwidth*(face3D.v1.normal.x * lightMatrix.n11 + face3D.v1.normal.y * lightMatrix.n12 + face3D.v1.normal.z * lightMatrix.n13)+lightmapHalfwidth;
			q1 = lightmapHalfheight*(face3D.v1.normal.x * lightMatrix.n21 + face3D.v1.normal.y * lightMatrix.n22 + face3D.v1.normal.z * lightMatrix.n23)+lightmapHalfheight;
			p2 = lightmapHalfwidth*(face3D.v2.normal.x * lightMatrix.n11 + face3D.v2.normal.y * lightMatrix.n12 + face3D.v2.normal.z * lightMatrix.n13)+lightmapHalfwidth;
			q2 = lightmapHalfheight*(face3D.v2.normal.x * lightMatrix.n21 + face3D.v2.normal.y * lightMatrix.n22 + face3D.v2.normal.z * lightMatrix.n23)+lightmapHalfheight;
				
			x0 = tri.v0.x;
		    y0 = tri.v0.y;
			x1 = tri.v1.x;
			y1 = tri.v1.y;
			x2 = tri.v2.x;
			y2 = tri.v2.y;
	
			triMatrix.a = x1 - x0;
			triMatrix.b = y1 - y0;
			triMatrix.c = x2 - x0;
			triMatrix.d = y2 - y0;
			triMatrix.tx = x0;
			triMatrix.ty = y0;
					
			transformMatrix.tx = p0;
		    transformMatrix.ty = q0;
		    transformMatrix.a = p1 - p0;
		    transformMatrix.b = q1 - q0;
		    transformMatrix.c = p2 - p0;
		    transformMatrix.d = q2 - q0;
			transformMatrix.invert();
			transformMatrix.concat(triMatrix);
			
			if(face3D.faceNormal.x * lightMatrix.n31 + face3D.faceNormal.y * lightMatrix.n32 + face3D.faceNormal.z * lightMatrix.n33 > 0){
				useMap = _lightMap;
			}else{
				useMap = backenvmap;
			}
			graphics.beginBitmapFill( useMap, transformMatrix, false, false);
		    graphics.moveTo( x0, y0 );
			graphics.lineTo( x1, y1 );
			graphics.lineTo( x2, y2 );
			graphics.lineTo( x0, y0 );
			graphics.endFill();
			renderSessionData.renderStatistics.shadedTriangles++;
		}
		
		public function set lightMap(lightMap:BitmapData):void
		{
			_lightMap = lightMap;
			lightmapHalfwidth = lightMap.width/2;
			lightmapHalfheight = lightMap.height/2;
		}
		
		public function get lightMap():BitmapData
		{
			return _lightMap;
		}
		
	}
}