Forked from:: yonatan's lighting test

forked from: lighting test

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license : MIT License
modified : 2012-03-12 22:13:54

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// forked from yonatan's lighting test
package {
    import flash.display.*;
    import flash.events.*;
    import flash.geom.*;
    import flash.utils.*;
    import flash.net.*;
    import com.bit101.components.*;
    import org.si.sion.utils.soundloader.*;

[SWF(width="465", height="465", frameRate="60", backgroundColor="0")]
    public class main extends Sprite {
        private const LINE_WIDTH_FACTOR:Number = 0.5;
        private const BRANCH_SCALE:Number = 0.74;
        private const VS:int = 350; // viewport size
        private const HVS:int = VS/2;
        private const SS:int = 465; // stage size
        private const HSS:int = SS/2;
        private const INIT_SIZE:Number = 120;
        // Minimal Gradient Editor (SWF素材) - http://wonderfl.net/c/6i8T
        private var GRADIENT_EDITOR_URL:String = "http://swf.wonderfl.net/swf/usercode/2/2c/2c1a/2c1a167b1a4db168e952e96df4e3d642544eb624.swf";
        private var sigl:SiGLCore = new SiGLCore(VS, VS);
        private var cbDrawAll:CheckBox;
        private var camSpeed:Number = 3;
        private var cam:SiGLMatrix = new SiGLMatrix;
        private var lastFrameTime:int = 0;
        private var minThickness:Number = 2;
        private var targetFPS:int = 24;
        private var maskAlpha:Number = 1;
        private var mt:Label;
        private var vl:VolumetricPointLight;
        private var intensity:Number = 2;
        private var light:Vector3D = new Vector3D;
        private var container:Sprite = new Sprite;
        private var mge:*;
        private var lockOnSun:Boolean = false;

public function main() {
            // GRADIENT_EDITOR_URL = "mge.swf"
            stage.quality = "medium";
            stage.scaleMode = "noScale";
            x = y = HSS;
            stage.addChild(container);

var loader:SoundLoader = new SoundLoader();
            loader.setURL(new URLRequest(GRADIENT_EDITOR_URL), "mge", null, true);
            loader.addEventListener(Event.COMPLETE, onLoaded);
            loader.loadAll();
        }

private function onLoaded(e:Event):void {
            vl = new VolumetricPointLight(VS, VS, this, [0xffffff, 0xffffff, 0xffcc88, 0x884422], [1, 1, 0.8, 0], [0, 4, 5, 120]);
            vl.scale = 2;
            vl.intensity = 2;
            vl.colorIntegrity = true;
            vl.setBufferSize(0x1000);
            vl.startRendering();
            container.addChild(vl);
            light.x = 0;
            light.y = -20000;
            light.z = -100000;

var MGE:Class = SoundLoader(e.target).hash["mge"].getClass();
            mge = new MGE(stage, 5, 36, "light gradient:", {color: vl._colors, alpha: vl._alphas, ratio: vl._ratios});
            //sigl.fieldOfView = 45;

addEventListener("enterFrame", onEnterFrame);

var uix:int = 5, uiy:int = 0;
            // var uix:int = -HSS+5, uiy:int = -HSS+5;
            var that:main = this;
            function _slider(txt:String, obj:Object, prop:String, min:Number, max:Number, val:Number):void {
                var s:HUISlider = new HUISlider(that.stage, uix, uiy, txt, function(e:Event):void { obj[prop] = e.target.value; });
                s.minimum = min; s.maximum = max; obj[prop] = s.value = val; uiy += 18;
            }
            function _cb(txt:String, obj:Object, prop:String, val:Boolean):void {
                var s:CheckBox = new CheckBox(that.stage, uix, uiy+3, txt, function(e:Event):void { obj[prop] = e.target.selected; });
                obj[prop] = s.selected = val; uiy += 18;
            }

// cbDrawAll = new CheckBox(this, uix, uiy, "Draw all computed branches (incl. clipped ones)"); uiy += 18;
            _slider("Target FPS", this, "targetFPS", 6, 40, targetFPS);
            // _slider("Mask alpha", "maskAlpha", 0, 1, 1);
            _slider("cam speed", this, "camSpeed", 0.1, 10, camSpeed);
            uiy=0; uix=190;
            _slider("light intensity", this, "intensity", 0.5, 10, vl.intensity);
            _slider("light scale", vl, "scale", 1, 4, vl.scale);
            _cb("colorIntegrity", vl, "colorIntegrity", vl.colorIntegrity);
            uiy = 36; uix = 300;
            _cb("lock cam on sun", this, "lockOnSun", false);

new FPSMeter(stage, SS-100, 0);
            mt = new Label(stage, SS-100, 18);
        }

private function onEnterFrame(e:Event):void {
            var t:int = getTimer();
            var renderTime:int = t - lastFrameTime;
            lastFrameTime = t;
            var timeDiff:Number = Math.abs(renderTime - 1000/targetFPS);
            if(timeDiff > 300/targetFPS) { // don't adjust unless we have to (reduces flicker)
                minThickness += (renderTime > 1000/targetFPS) ? 0.1 : -0.1;
                if(minThickness < 1) minThickness = 1;
            }
            mt.text = "Min. thickness: " + minThickness.toFixed(2);

graphics.clear();

var cx:Number = Math.sin(t/(56789/camSpeed)) * 1550;
            var cz:Number = Math.cos(t/(45678/camSpeed)) * 1550;
            var cy:Number = Math.cos(t/(34567/camSpeed)) * 500 - 500;

var tw:Number = lockOnSun ? 1 : 0.5+0.5*Math.cos(t/(27890/camSpeed));

var twp:Number = Math.pow(tw, 6);
            var tx:Number = light.x * twp;
            var ty:Number = light.y * twp + (-INIT_SIZE/BRANCH_SCALE) * (1-twp);
            var tz:Number = light.z * twp;
            cy = cy * (1-tw) + tw * -INIT_SIZE;

cam.id().prependTranslation(cx, cy, cz);
            cam.lookAt(cx,cy,cz, tx,ty,tz, 0,1,0, 1);
            sigl.setCameraMatrix(cam);

for(var x:int = -4800; x <= 4800; x += 300) {
                for(var z:int = -4800; z <= 4800; z += 300) {
                    sigl.push().t(x, 0, z).r(x+z, Vector3D.Y_AXIS);
                    render(INIT_SIZE);
                    sigl.pop();
                }
            }

var pl:Vector3D = new Vector3D;
            sigl.projectionMatrix.transform(light, pl);
            pl.w = pl.z/sigl.focalLength;
            pl.x /= pl.w;
            pl.y /= pl.w;
            vl.srcX = pl.x + HSS;
            vl.srcY = pl.y + HSS;
            //vl.intensity = (pl.z > 0 && pl.x > -SS && pl.x < SS && pl.y > -SS && pl.y < SS) ? 2 : 0;
            vl.intensity = Math.min(intensity, Math.min(pl.z, Math.abs(pl.x - VS), Math.abs(pl.y - VS)) / 100);
            if(vl.intensity < 0) vl.intensity = 0;
            vl.emission.visible = vl.intensity > 0;
            
            container.graphics.clear();
            container.graphics.lineStyle();
            container.graphics.beginFill(0x8497b4);//0x4488cc);//0xffeedd, maskAlpha);
            container.graphics.drawRect(0, 0, VS, VS);
            container.graphics.endFill();
            //container.scrollRect = new Rectangle(0, 0, VS, VS);
            this.x = this.y = HVS;//HSS-(SS-VS);
            container.x = container.y = HSS-HVS;
        }

private var p1:Vector3D = new Vector3D, p2:Vector3D = new Vector3D;
        private function render(size:Number):void {
            function projxy(v:Vector3D):void {
                sigl.projectionMatrix.transform(sigl.matrix.position, v);
                v.w = v.z/sigl.focalLength;
                v.x /= v.w;
                v.y /= v.w;
                // v.project();
            }
            sigl.push();
            projxy(p1);
            var limit:Number = size / (1 - BRANCH_SCALE);
            var xl:Number = HVS+limit*2/p1.w; // why *2 ???
            var yl:Number = HVS+limit*2/p1.w;
            if(p1.z > sigl.zNear-limit
                && p1.x > -xl && p1.x < xl
                && p1.y > -yl && p1.y < yl
            ) {
                size *= BRANCH_SCALE;
                sigl.t(0, -size, 0);
                projxy(p2);
                var thickness:Number = size * LINE_WIDTH_FACTOR / ((p1.w+p2.w)*0.5);
                // crude clipping
                var cs:Number = HVS + thickness * 0.5;
                var isClipped:Boolean = (p1.x < -cs && p2.x < -cs) || (p1.x > cs && p2.x > cs) || (p1.y < -cs && p2.y < -cs) || (p1.y > cs && p2.y > cs) || p1.z < 0 || p2.z < 0;
                if(thickness > minThickness) {
                    if((cbDrawAll && cbDrawAll.selected) || !isClipped) {
                        graphics.lineStyle(thickness, 0, (thickness-minThickness), false, "normal", "none");
                        graphics.moveTo(p1.x, p1.y);
                        graphics.lineTo(p2.x, p2.y);
                    }
                    sigl.r(120, Vector3D.Y_AXIS).r(-30, Vector3D.X_AXIS);
                    render(size);
                    sigl.r(70, Vector3D.X_AXIS);
                    render(size);
                }
            }
            sigl.pop();
        }
    }
}

import flash.display.*;
import flash.events.*;
import flash.filters.*;
import flash.geom.*;

// useful stuff by keim_at_Si (i think i copied it from the boolean crystals demo)
// modifications:
// - dest arg in SiGLMatrix transform() function
// - reuse objects on SiGLMatrix stack in push, pop, rem (rem might be broken now)
// - focalLength, zNear, zFar getters in SiGLCore

/** SiGLCore provides basic matrix operations. */
class SiGLCore {
    // variables ----------------------------------------
    public var modelViewMatrix:SiGLMatrix = new SiGLMatrix(), projectionMatrix:SiGLMatrix = new SiGLMatrix();
    public var viewWidth:Number, viewHeight:Number, pointSpriteFieldScale:Point = new Point();
    public var defaultCameraMatrix:SiGLMatrix = new SiGLMatrix(), matrix:SiGLMatrix = modelViewMatrix;
    private var _mvpMatrix:SiGLMatrix = new SiGLMatrix(), _mvpdir:Boolean, _2d:Number, _2r:Number;
    private var _mag:Number, _zNear:Number, _zFar:Number, _fieldOfView:Number, _fl:Number, _alignTopLeft:Boolean = false;
    // properties ----------------------------------------
    public function get modelViewProjectionMatrix() : SiGLMatrix {
        if (_mvpdir) {
            _mvpMatrix.copyFrom(projectionMatrix);
            _mvpMatrix.prepend(modelViewMatrix);
            _mvpdir = false;
        }
        return _mvpMatrix;
    }
    public function get focalLength() : Number { return _fl; }
    public function get zNear() : Number { return _zNear; }
    public function get zFar() : Number { return _zFar; }
    public function get align() : String { return (_alignTopLeft) ? "topLeft" : "center"; }
    public function set align(mode:String) : void { _alignTopLeft = (mode == "topLeft"); _updateProjectionMatrix(); }
    public function get matrixMode() : String { return (matrix === projectionMatrix) ? "projection" : "modelView"; }
    public function set matrixMode(mode:String) : void { matrix = (mode == "projection") ? projectionMatrix : modelViewMatrix; }
    public function get angleMode() : String { return (_2r == 1) ? "radian" : "degree"; }
    public function set angleMode(mode:String) : void { _2d = (mode == "radian") ? 57.29577951308232 : 1; _2r = (mode == "radian") ? 1 : 0.017453292519943295; }
    public function get fieldOfView() : Number { return _fieldOfView / _2r; }
    public function set fieldOfView(fov:Number) : void { _fieldOfView = fov * _2r; _updateProjectionMatrix(); }
    public function get magnification() : Number { return _mag; }
    public function set magnification(mag:Number) : void { _mag = mag; _updateProjectionMatrix(); }
    // constructor ----------------------------------------
    function SiGLCore(width:Number=1, height:Number=1) {
        viewWidth = width; viewHeight = height;
        angleMode = "degree"; _mag = 1;
        _zNear = -1000; _zFar = 200;
        modelViewMatrix.identity();
        _mvpdir = true;
        this.fieldOfView = 60;
    }
    // matrix operations ----------------------------------------
    public function forceUpdateMatrix() : SiGLCore { _mvpdir = true; return this; }
    public function setZRange(zNear:Number=-100, zFar:Number=100) : SiGLCore { _zNear = zNear; _zFar = zFar; _updateProjectionMatrix(); return this; }
    public function clear() : SiGLCore { matrix.clear(); _mvpdir = true; return this; }
    public function id() : SiGLCore { matrix.id(); _mvpdir = true; return this; }
    public function push() : SiGLCore { matrix.push(); return this; }
    public function pop() : SiGLCore { matrix.pop(); _mvpdir = true; return this; }
    public function rem() : SiGLCore { matrix.rem(); _mvpdir = true; return this; }
    public function r(a:Number, axis:Vector3D, pivot:Vector3D = null) : SiGLCore { matrix.prependRotation(a*_2d, axis, pivot); matrix._invdir = _mvpdir = true; return this; }
    public function s(x:Number, y:Number, z:Number=1) : SiGLCore { matrix.prependScale(x, y, z); matrix._invdir = _mvpdir = true; return this; }
    public function t(x:Number, y:Number, z:Number=0) : SiGLCore { matrix.prependTranslation(x, y, z); matrix._invdir = _mvpdir = true; return this; }
    public function m(mat:Matrix3D) : SiGLCore { matrix.prepend(mat); matrix._invdir = _mvpdir = true; return this; }
    public function re(x:Number, y:Number, z:Number) : SiGLCore { matrix.prependRotationXYZ(x*_2r, y*_2r, z*_2r); _mvpdir = true; return this; }
    public function setCameraMatrix(mat:Matrix3D=null) : SiGLCore { projectionMatrix.rem().prepend(mat || defaultCameraMatrix); _mvpdir = true; return this; }
    private function _updateProjectionMatrix() : void {
        var wh:Number = viewWidth / viewHeight, rev:Number = (_alignTopLeft)?-1:1;
        _fl = (viewHeight * 0.5) / Math.tan(_fieldOfView * 0.5);
        if (_zNear <= -_fl) _zNear = -_fl + 0.001;
        projectionMatrix.clear().perspectiveFieldOfView(_fieldOfView, wh, _zNear+_fl, _zFar+_fl, -1);
        pointSpriteFieldScale.setTo(projectionMatrix.rawData[0] * _fl, projectionMatrix.rawData[5] * _fl);
        projectionMatrix.push();
        defaultCameraMatrix.identity();
        defaultCameraMatrix.prependTranslation(0, 0, -_fl);
        if (_alignTopLeft) defaultCameraMatrix.prependTranslation(viewWidth* 0.5, -viewHeight * 0.5, 0);
        defaultCameraMatrix.prependScale(_mag, _mag * rev, _mag * rev);
        setCameraMatrix();
    }
}

/** SiGLMatrix is extention of Matrix3D with push/pop operation */
class SiGLMatrix extends Matrix3D {
    internal var _top:int = 0, _invdir:Boolean = false, _inv:Matrix3D = new Matrix3D(), _stac:Vector.<Matrix3D> = new Vector.<Matrix3D>();
    static private var _tv:Vector.<Number> = new Vector.<Number>(16, true), _tm:Matrix3D = new Matrix3D();
    static private var _in:Vector.<Number> = new Vector.<Number>(4, true), _out:Vector.<Number> = new Vector.<Number>(4, true);
    public function get inverted() : Matrix3D { if (_invdir) { _inv.copyFrom(this); _inv.invert(); _invdir = false; } return _inv; }
    public function forceUpdateInvertedMatrix() : SiGLMatrix { _invdir=true; return this; }
    public function clear() : SiGLMatrix { _top = 0; return id(); }
    public function id() : SiGLMatrix { identity(); _inv.identity(); return this; }
    public function push() : SiGLMatrix {
        if(_stac.length == _top) _stac.push(new Matrix3D());
        _stac[_top++].copyFrom(this);
        return this; 
    }
    public function pop() : SiGLMatrix { 
        this.copyFrom(_stac[--_top]);
        _invdir=true;
        return this;
    }
    public function rem() : SiGLMatrix { this.copyFrom(_stac[_top-1]); _invdir=true; return this; }
    public function prependRotationXYZ(rx:Number, ry:Number, rz:Number) : SiGLMatrix {
        var sx:Number = Math.sin(rx), sy:Number = Math.sin(ry), sz:Number = Math.sin(rz), 
        cx:Number = Math.cos(rx), cy:Number = Math.cos(ry), cz:Number = Math.cos(rz);
        _tv[0] = cz*cy; _tv[1] = sz*cy; _tv[2] = -sy; _tv[4] = -sz*cx+cz*sy*sx; _tv[5] = cz*cx+sz*sy*sx;
        _tv[6] = cy*sx; _tv[8] = sz*sx+cz*sy*cx; _tv[9] = -cz*sx+sz*sy*cx;
        _tv[10] = cy*cx; _tv[14] = _tv[13] = _tv[12] = _tv[11] = _tv[7] = _tv[3] = 0; _tv[15] = 1;
        _tm.copyRawDataFrom(_tv); prepend(_tm); _invdir=true;
        return this;
    }
    public function lookAt(cx:Number, cy:Number, cz:Number, tx:Number=0, ty:Number=0, tz:Number=0, ux:Number=0, uy:Number=1, uz:Number=0, w:Number=0) : SiGLMatrix {
        var dx:Number=tx-cx, dy:Number=ty-cy, dz:Number=tz-cz, dl:Number=-1/Math.sqrt(dx*dx+dy*dy+dz*dz), 
        rx:Number=dy*uz-dz*uy, ry:Number=dz*ux-dx*uz, rz:Number=dx*uy-dy*ux, rl:Number= 1/Math.sqrt(rx*rx+ry*ry+rz*rz);
        _tv[0]  = (rx*=rl); _tv[4]  = (ry*=rl); _tv[8]  = (rz*=rl); _tv[12] = -(cx*rx+cy*ry+cz*rz) * w;
        _tv[2]  = (dx*=dl); _tv[6]  = (dy*=dl); _tv[10] = (dz*=dl); _tv[14] = -(cx*dx+cy*dy+cz*dz) * w;
        _tv[1]  = (ux=dy*rz-dz*ry); _tv[5]  = (uy=dz*rx-dx*rz); _tv[9]  = (uz=dx*ry-dy*rx); _tv[13] = -(cx*ux+cy*uy+cz*uz) * w;
        _tv[3] = _tv[7] = _tv[11] = 0; _tv[15] = 1; copyRawDataFrom(_tv); _invdir=true;
        return this;
    }
    public function perspectiveFieldOfView(fieldOfViewY:Number, aspectRatio:Number, zNear:Number, zFar:Number, lh:Number=1.0) : void {
        var yScale:Number = 1.0 / Math.tan(fieldOfViewY * 0.5), xScale:Number = yScale / aspectRatio;
        this.copyRawDataFrom(Vector.<Number>([xScale,0,0,0,0,yScale,0,0,0,0,zFar/(zFar-zNear)*lh,lh,0,0,(zNear*zFar)/(zNear-zFar),0]));
    }
    public function transform(vector:Vector3D, dest:Vector3D = null) : Vector3D {
        if(!dest) dest = vector;
        _in[0] = vector.x; _in[1] = vector.y; _in[2] = vector.z; _in[3] = vector.w;
        transformVectors(_in, _out); dest.setTo(_out[0], _out[1], _out[2]); dest.w = _out[3];
        return dest;
    }
}

// volumetrics ------------------------------------------------------------------------------
class EffectContainer extends Sprite {
    public var blur:Boolean = false;
    public var colorIntegrity:Boolean = false;
    public var intensity:Number = 4;
    public var passes:uint = 6;
    public var rasterQuality:String = null;
    public var scale:Number = 2;
    public var smoothing:Boolean = true;
    public var srcX:Number;
    public var srcY:Number;

protected var _blurFilter:BlurFilter = new BlurFilter(2, 2);
    protected var _emission:DisplayObject;
    protected var _occlusion:DisplayObject;
    protected var _ct:ColorTransform = new ColorTransform;
    protected var _halve:ColorTransform = new ColorTransform(0.5, 0.5, 0.5);
    protected var _occlusionLoResBmd:BitmapData;
    protected var _occlusionLoResBmp:Bitmap;
    protected var _baseBmd:BitmapData;
    protected var _bufferBmd:BitmapData;
    protected var _lightBmp:Bitmap = new Bitmap;
    protected var _bufferSize:uint = 0x8000;
    protected var _bufferWidth:uint;
    protected var _bufferHeight:uint;
    protected var _viewportWidth:uint;
    protected var _viewportHeight:uint;
    protected var _mtx:Matrix = new Matrix;

public function EffectContainer(width:uint, height:uint, emission:DisplayObject, occlusion:DisplayObject = null) {
        if(!emission) throw(new Error("emission DisplayObject must not be null."));
        addChild(_emission = emission);
        if(occlusion) addChild(_occlusion = occlusion);
        setViewportSize(width, height);
        _lightBmp.blendMode = BlendMode.ADD;
        addChild(_lightBmp);
        srcX = width / 2;
        srcY = height / 2;
    }

public function setViewportSize(width:uint, height:uint):void {
        _viewportWidth = width;
        _viewportHeight = height;
        scrollRect = new Rectangle(0, 0, width, height);
        _updateBuffers();
    }

public function setBufferSize(size:uint):void {
        _bufferSize = size;
        _updateBuffers();
    }

protected function _updateBuffers():void {
        var aspect:Number = _viewportWidth / _viewportHeight;
        _bufferHeight = Math.max(1, Math.sqrt(_bufferSize / aspect));
        _bufferWidth  = Math.max(1, _bufferHeight * aspect);
        dispose();
        _baseBmd           = new BitmapData(_bufferWidth, _bufferHeight, false, 0);
        _bufferBmd         = new BitmapData(_bufferWidth, _bufferHeight, false, 0);
        _occlusionLoResBmd = new BitmapData(_bufferWidth, _bufferHeight, true, 0);
        _occlusionLoResBmp = new Bitmap(_occlusionLoResBmd);
    }

public function render(e:Event = null):void {
        if(!(_lightBmp.visible = intensity > 0)) return;
        var savedQuality:String = stage.quality;
        if(rasterQuality) stage.quality = rasterQuality;
        var mul:Number = colorIntegrity ? intensity : intensity/(1<<passes);
        _ct.redMultiplier = _ct.greenMultiplier = _ct.blueMultiplier = mul;
        _drawLoResEmission();
        if(_occlusion) _eraseLoResOcclusion();
        if(rasterQuality) stage.quality = savedQuality;
        var s:Number = 1 + (scale-1) / (1 << passes);
        var tx:Number = srcX/_viewportWidth*_bufferWidth;
        var ty:Number = srcY/_viewportHeight*_bufferHeight;
        _mtx.identity();
        _mtx.translate(-tx, -ty);
        _mtx.scale(s, s);
        _mtx.translate(tx, ty);
        _lightBmp.bitmapData = _applyEffect(_baseBmd, _bufferBmd, _mtx, passes);
        _lightBmp.width = _viewportWidth;
        _lightBmp.height = _viewportHeight;
        _lightBmp.smoothing = smoothing;
    }

protected function _drawLoResEmission():void {
        _copyMatrix(_emission.transform.matrix, _mtx);
        _mtx.scale(_bufferWidth / _viewportWidth, _bufferHeight / _viewportHeight);
        _baseBmd.fillRect(_baseBmd.rect, 0);
        _baseBmd.draw(_emission, _mtx, colorIntegrity ? null : _ct);
    }

protected function _eraseLoResOcclusion():void {
        _occlusionLoResBmd.fillRect(_occlusionLoResBmd.rect, 0);
        _copyMatrix(_occlusion.transform.matrix, _mtx);
        _mtx.scale(_bufferWidth / _viewportWidth, _bufferHeight / _viewportHeight);
        _occlusionLoResBmd.draw(_occlusion, _mtx);
        _baseBmd.draw(_occlusionLoResBmp, null, null, BlendMode.ERASE);
    }

public function startRendering():void {
        addEventListener(Event.ENTER_FRAME, render);
    }

public function stopRendering():void {
        removeEventListener(Event.ENTER_FRAME, render);
    }

protected function _applyEffect(src:BitmapData, buffer:BitmapData, mtx:Matrix, passes:uint):BitmapData {
        var tmp:BitmapData;
        while(passes--) {
            if(colorIntegrity) src.colorTransform(src.rect, _halve);
            buffer.copyPixels(src, src.rect, src.rect.topLeft);
            buffer.draw(src, mtx, null, BlendMode.ADD, null, true);
            mtx.concat(mtx);
            tmp = src; src = buffer; buffer = tmp;
        }
        if(colorIntegrity) src.colorTransform(src.rect, _ct);
        if(blur) src.applyFilter(src, src.rect, src.rect.topLeft, _blurFilter);
        return src;
    }

public function dispose():void {
        if(_baseBmd) _baseBmd.dispose();
        if(_occlusionLoResBmd) _occlusionLoResBmd.dispose();
        if(_bufferBmd) _bufferBmd.dispose();
        _baseBmd = _occlusionLoResBmd = _bufferBmd = _lightBmp.bitmapData = null;
    }

protected function _copyMatrix(src:Matrix, dst:Matrix):void {
        dst.a = src.a;
        dst.b = src.b;
        dst.c = src.c;
        dst.d = src.d;
        dst.tx = src.tx;
        dst.ty = src.ty;
    }
}

class VolumetricPointLight extends EffectContainer {
    public var _colors:Array;
    public var _alphas:Array;
    public var _ratios:Array;
    protected var _gradient:Shape = new Shape;
    protected var _gradientMtx:Matrix = new Matrix;
    protected var _gradientBmp:Bitmap = new Bitmap;
    protected var _lastSrcX:Number;
    protected var _lastSrcY:Number;
    protected var _lastIntensity:Number;
    protected var _lastColorIntegrity:Boolean = false;
    protected var _gradientLoResBmd:BitmapData;
    protected var _gradientLoResDirty:Boolean = true;

public function get emission():DisplayObject { return _emission; }
    
    public function VolumetricPointLight(width:uint, height:uint, occlusion:DisplayObject, colorOrGradient:*, alphas:Array = null, ratios:Array = null) {
        if(colorOrGradient is Array) {
            _colors = colorOrGradient.concat();
            _ratios = ratios || _colors.map(function(item:*, i:int, arr:Array):int { return 0x100*i/(colorOrGradient.length+i-1) });
            _alphas = alphas || _colors.map(function(..._):Number { return 1 });
        } else {
            _colors = [colorOrGradient, 0];
            _ratios = [0, 255];
        }
        super(width, height, _gradientBmp, occlusion);
        if(!occlusion) throw(new Error("An occlusion DisplayObject must be provided."));
        if(!(colorOrGradient is Array || colorOrGradient is uint)) throw(new Error("colorOrGradient must be either an Array or a uint."));
    }

protected function _drawGradient():void {
        var size:Number = 2 * Math.sqrt(_viewportWidth*_viewportWidth + _viewportHeight*_viewportHeight);
        _gradientMtx.createGradientBox(size, size, 0, -size/2 + srcX, -size/2 + srcY);
        _gradient.graphics.clear();
        _gradient.graphics.beginGradientFill(GradientType.RADIAL, _colors, _alphas, _ratios, _gradientMtx);
        _gradient.graphics.drawRect(0, 0, _viewportWidth, _viewportHeight);
        _gradient.graphics.endFill();
        if(_gradientBmp.bitmapData) _gradientBmp.bitmapData.dispose();
        _gradientBmp.bitmapData = new BitmapData(_viewportWidth, _viewportHeight, true, 0);
        _gradientBmp.bitmapData.draw(_gradient);
    }

override protected function _drawLoResEmission():void {
        if(_gradientLoResDirty) {
            super._drawLoResEmission();
            _gradientLoResBmd.copyPixels(_baseBmd, _baseBmd.rect, _baseBmd.rect.topLeft);
            _gradientLoResDirty = false;
        } else {
            _baseBmd.copyPixels(_gradientLoResBmd, _baseBmd.rect, _baseBmd.rect.topLeft);
        }
    }

override protected function _updateBuffers():void {
        super._updateBuffers();
        _gradientLoResBmd = new BitmapData(_bufferWidth, _bufferHeight, false, 0);
        _gradientLoResDirty = true;
    }

override public function setViewportSize(width:uint, height:uint):void {
        super.setViewportSize(width, height);
        _drawGradient();
        _gradientLoResDirty = true;
    }

override public function render(e:Event = null):void {
        var srcChanged:Boolean = _lastSrcX != srcX || _lastSrcY != srcY;
        if(srcChanged) _drawGradient();
        _gradientLoResDirty ||= srcChanged;
        _gradientLoResDirty ||= (!colorIntegrity && (_lastIntensity != intensity));
        _gradientLoResDirty ||= (_lastColorIntegrity != colorIntegrity);
        _lastSrcX = srcX;
        _lastSrcY = srcY;
        _lastIntensity = intensity;
        _lastColorIntegrity = colorIntegrity;
        super.render(e);
    }

override public function dispose():void {
        super.dispose();
        if(_gradientLoResBmd) _gradientLoResBmd.dispose();
        _gradientLoResBmd = null;
    }
}

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