PixelBender(着色器)初体验
只要是玩过photoshop的人，一定会对ps中的各式各样、功能强大的滤镜(filter)留下深刻的印象。 Adobe是靠图形处理软件起家的，这方面一直是它的强项。这一技术经过不断发展，最终形成了今天的Pixel Bender(官方翻译为"着色器")，它在Adobe CS系列的主要产品中都被良好支持(包括Flash)，而且据官方的介绍pixel bender支持GPU,多线程.
下面是几个在Flash中使用pixelBender的示例:
1.RGB色彩反相(有点象底片效果)
package {
import flash.display.*;
import flash.events.*;
import flash.filters.*;
import flash.net.*;
import flash.utils.ByteArray;
[SWF(width="300",height="450",backgroundColor="#000000",framerate="30")]
public class Demo1 extends Sprite {
[Embed("invertRGB.pbj",mimeType="application/octet-stream")]
private var TestFilter:Class;
[Embed(source="mm1.png")]
private var image:Class;
private var im:Bitmap;
private var btnAdd:FlatButton;
private var isApply:Boolean=false;
public function Demo1():void {
im=new image as Bitmap;
addChild(im);
btnAdd = new FlatButton();
addChild(btnAdd);
btnAdd.scaleX=btnAdd.scaleY=1.5;
btnAdd.x=stage.stageWidth/2;
btnAdd.y=25;
btnAdd.addEventListener(MouseEvent.CLICK,btnAddClickHandler);
}
function btnAddClickHandler(e:MouseEvent):void {
if (! isApply) {
var shader:Shader = new Shader(new TestFilter() as ByteArray);
var filter:ShaderFilter=new ShaderFilter(shader);
im.filters=[filter];
isApply=true;
} else {
im.filters=[];
isApply=false;
}
}
}
}2.变色效果
package {
import flash.display.*;
import flash.events.*;
import flash.filters.*;
import flash.net.*;
import flash.utils.ByteArray;
import fl.controls.*;
import fl.events.SliderEvent;
[SWF(width="300",height="450",backgroundColor="#000000",framerate="30")]
public class Demo2 extends Sprite {
[Embed("sepia.pbj",mimeType="application/octet-stream")]
private var TestFilter:Class;
[Embed(source="mm1.png")]
private var image:Class;
private var im:Bitmap;
private var sl:Slider;
public function Demo2():void {
im=new image as Bitmap;
addChild(im);
sl = new Slider();
addChild(sl);
sl.scaleX=sl.scaleY=2.0;
sl.x=stage.stageWidth/2-sl.width/2;
sl.y=20;
sl.minimum=-1.0;
sl.maximum=1.0;
sl.snapInterval=0.05;
sl.addEventListener(SliderEvent.THUMB_DRAG,changeHandler);
}
function changeHandler(e:SliderEvent):void {
var shader:Shader = new Shader(new TestFilter() as ByteArray);
shader.data["intensity"].value[0] = e.value;
var filter:ShaderFilter=new ShaderFilter(shader);
im.filters=[filter];
}
}
}3.马赛克效果
package {
import flash.display.*;
import flash.events.*;
import flash.filters.*;
import flash.net.*;
import flash.utils.ByteArray;
import fl.controls.*;
import fl.events.SliderEvent;
[SWF(width="300",height="450",backgroundColor="#000000",framerate="30")]
public class Demo3 extends Sprite {
[Embed("pixelate.pbj",mimeType="application/octet-stream")]
private var TestFilter:Class;
[Embed(source="mm1.png")]
private var image:Class;
private var im:Bitmap;
private var sl:Slider;
public function Demo3():void {
im=new image as Bitmap;
addChild(im);
sl = new Slider();
addChild(sl);
sl.scaleX=sl.scaleY=2.0;
sl.x=stage.stageWidth/2-sl.width/2;
sl.y=20;
sl.minimum=1;
sl.maximum=50;
sl.snapInterval=1;
sl.addEventListener(SliderEvent.THUMB_DRAG,changeHandler);
}
function changeHandler(e:SliderEvent):void {
var shader:Shader = new Shader(new TestFilter() as ByteArray);
shader.data["dimension"].value[0] = e.value;
var filter:ShaderFilter=new ShaderFilter(shader);
im.filters=[filter];
}
}
}4.扭曲效果
package {
import flash.display.*;
import flash.events.*;
import flash.filters.*;
import flash.net.*;
import flash.utils.ByteArray;
import fl.controls.*;
import fl.events.SliderEvent;
[SWF(width="300",height="450",backgroundColor="#000000",framerate="30")]
public class Demo4 extends Sprite {
[Embed("twirl.pbj",mimeType="application/octet-stream")]
private var TestFilter:Class;
[Embed(source="mm1.png")]
private var image:Class;
private var im:Bitmap;
private var slRadius:Slider;
private var slCenterX:Slider;
private var slCenterY:Slider;
private var sAngle:Slider;
public function Demo4():void {
im=new image as Bitmap;
addChild(im);
slRadius = new Slider();
slCenterX = new Slider();
slCenterY = new Slider();
sAngle = new Slider();
addChild(slRadius);
addChild(slCenterX);
addChild(slCenterY);
addChild(sAngle);
slRadius.scaleX=slRadius.scaleY=slCenterX.scaleX=slCenterX.scaleY=slCenterY.scaleX=slCenterY.scaleY=sAngle.scaleX=sAngle.scaleY=2.0;
slRadius.x=stage.stageWidth/2-slRadius.width/2;
slRadius.y=20;
slCenterX.x = slRadius.x;
slCenterX.y = slRadius.y + 20;
slCenterY.x = slRadius.x;
slCenterY.y = slCenterX.y + 20;
sAngle.x = slRadius.x;
sAngle.y = slCenterY.y + 20;
slRadius.minimum=10;
slRadius.maximum=290;
slRadius.snapInterval=1;
slCenterX.minimum=0;
slCenterX.maximum=300;
slCenterX.snapInterval=1;
slCenterY.minimum=0;
slCenterY.maximum=450;
slCenterY.snapInterval=1;
sAngle.minimum=0;
sAngle.maximum=360;
sAngle.snapInterval=1;
sAngle.value = 90;
slRadius.addEventListener(SliderEvent.THUMB_DRAG,slRadiusHandler);
slCenterX.addEventListener(SliderEvent.THUMB_DRAG,slRadiusHandler);
slCenterY.addEventListener(SliderEvent.THUMB_DRAG,slRadiusHandler);
sAngle.addEventListener(SliderEvent.THUMB_DRAG,slRadiusHandler);
}
function slRadiusHandler(e:SliderEvent):void {
var shader:Shader = new Shader(new TestFilter() as ByteArray);
shader.data["twirlAngle"].value[0]=sAngle.value;
shader.data["center"].value[0]=slCenterX.value;
shader.data["center"].value[1]=slCenterY.value;
shader.data["radius"].value[0]=slRadius.value;
var filter:ShaderFilter=new ShaderFilter(shader);
im.filters=[filter];
}
}
}5.混合过渡效果
package {
import flash.display.*;
import flash.events.*;
import flash.filters.*;
import flash.net.*;
import flash.utils.ByteArray;
import fl.controls.*;
[SWF(width="300",height="450",backgroundColor="#000000",framerate="30")]
public class Demo5 extends Sprite {
[Embed("crossfade.pbj",mimeType="application/octet-stream")]
private var TestFilter:Class;
[Embed(source="mm1.png")]
private var image:Class;
[Embed(source="mm2.jpg")]
private var image2:Class;
private var im:Bitmap;
private var im2:Bitmap;
private var sl:Slider;
public function Demo5():void {
im=new image as Bitmap;
im2=new image2 as Bitmap;
addChild(im);
addChild(im2);
sl = new Slider();
addChild(sl);
sl.minimum=0;
sl.maximum=1;
sl.snapInterval=0.01;
sl.value=1;
sl.scaleX=sl.scaleY=2.0;
sl.x=stage.stageWidth/2-sl.width/2;
sl.y=20;
addEventListener(Event.ENTER_FRAME,enterFrameHandler);
}
function enterFrameHandler(e:Event):void {
var shader:Shader = new Shader(new TestFilter() as ByteArray);
shader.data.frontImage.input=im2.bitmapData;
shader.data.backImage.input=im.bitmapData;
shader.data["intensity"].value[0]=sl.value;
im2.blendMode=BlendMode.SCREEN;//这一句加上后，好象容易引起Flash崩溃，但不加这一句，又无法实时刷新。
im2.blendShader=shader;
}
}
}以上效果都是PixelBender ToolKit自带的，如果您想开发自己想要的效果，Adobe也提供了详细的在线教程方便开发者学习。
源文件下载：http://cid-2959920b8267aaca.office.live.com/self.aspx/Flash/PixelBender.rar
本文参与 腾讯云自媒体分享计划，分享自作者个人站点/博客。
原始发表：2010-06-28 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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