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// forked from shohei909's Japanese Mountain
// forked from shohei909's Mountain
//mountain 日本画風の山を描く

package {
    import flash.display.*;
    import mx.utils.ColorUtil;
    import flash.geom.*;
    import flash.events.*;
    [SWF(width="600", height="600", backgroundColor="0", frameRate="30")]
    public class FlashTest extends Sprite {
        private var map:BitmapData =  new BitmapData(2048,701,true,0);
        private var mtx:Matrix = new Matrix;
        private var canvas:Shape = new Shape;
        private var vpl:VolumetricPointLight;

public function FlashTest() {
            map.perlinNoise(256,256,7,Math.random()*100,true,true,8,true);
            for(var i:int=0;i<map.width;i++){
                for(var j:int=300;j<700;j++){
                    var l:uint = map.getPixel32(i,j)/0x01010101;
                    var color:uint = ColorUtil.adjustBrightness2(0xDDDDDD, Math.sin(Math.atan( (map.getPixel32(i,j)-map.getPixel32(i,j+20))/0x5000000 ))*50-50);
                    map.fillRect(new Rectangle(i,j-l,1,l),color|0xff000000);
                }
            }
            addChild(vpl = new VolumetricPointLight(600, 600, canvas, 0xc0c0c0));
            vpl.setBufferSize(0x4000);
            vpl.srcY = 600/4;
            vpl.scale = 3.5;
            vpl.intensity = 1.6;
            addEventListener("enterFrame", onEnterFrame);
        }
        
        private function onEnterFrame(e:Event):void {
            canvas.graphics.clear();
            canvas.graphics.beginBitmapFill(map, mtx, true);
            canvas.graphics.drawRect(0, 0, 600, 600);
            canvas.graphics.endFill();
            mtx.tx--;
            vpl.render();
        }
    }
}

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

// 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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