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AGAL逻辑判断

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发表于 2013-5-16 22:58:18 |只看该作者 |倒序浏览

pstatus"> 本帖最后由家熊于 2013-5-16 23:03 编辑

AGAL逻辑判断
////////////////////////////////////////////////////////////////////
这一节中，我先贴出代码和源文件，下一节对代码进行深度剖析

///////////////////////////////////////////////////////////////////
Model2D.as
package
{

      import flash.display3D.Context3D;
      import flash.display3D.Context3DVertexBufferFormat;
      import flash.display3D.textures.Texture;
      import flash.display3D.VertexBuffer3D;
      import flash.geom.Matrix3D;
      import flash.geom.Vector3D;


      public class Model2D
      {

            /**
               * 基本的控制属性
               */
            public var x:Number=0;
            public var y:Number=0;
            public var z:Number=0;
            public var rotation:Number=0;
            public var width:Number=0;
            public var height:Number=0;
            public var scaleX:Number=1;
            public var scaleY:Number=1;


            //缓冲顶点数据
            private var buffer:VertexBuffer3D;

            //矩阵
            private var matrix:Matrix3D;

            public function Model2D(context:Context3D)
            {
                     //创建一个顶点缓冲4行4列
                     buffer    = context.createVertexBuffer(4, 4); //x, y, u, v
                     //创建一个试图矩阵
                     matrix    = new Matrix3D();
                     //上传顶点坐标从0开始，顶点元素数量为4
                     buffer.uploadFromVector(Vector.<Number>
                     ([
                              -1.0, 1.0, 0.0, 1.0,
                              -1.0,-1.0, 0.0, 0.0,
                              1.0,-1.0, 1.0, 0.0,
                              1.0, 1.0, 1, 1.0
                     ]), 0, 4);
            }

            /**
               * 绘制
               * @param       context
               * @param       texture
               */
            public function paint(context:Context3D, texture:Texture):void
            {

                     //上传XY坐标属性对应va0,偏移量为0,长度为2
                     context.setVertexBufferAt(0, buffer, 0, Context3DVertexBufferFormat.FLOAT_2); //xy

                     //上传UV坐标，对应va1,偏移量为2,长度为2
                     context.setVertexBufferAt(1, buffer, 2, Context3DVertexBufferFormat.FLOAT_2); //uv

                     //上传纹理,对应fs0
                     context.setTextureAt(0, texture);
            }

            /**
               * 获取已经处理好的matrix3D对象
               * @return
               */
            public function matrix3D():Matrix3D
            {
                     //重置矩阵
                     matrix.identity();

                     //旋转
                     matrix.appendRotation(rotation, Vector3D.Z_AXIS);

                     //缩放
                     matrix.appendScale(width * (scaleX / 2), height * (scaleY / 2), 1);

                     //位置
                     matrix.appendTranslation((width / 2) + x, (height / 2) + y, z);
                     return matrix;
            }
      }
////////////////////////////////////////////////////////////////////////////////////
Sprite2D.as
package
{


      import com.adobe.utils.AGALMiniAssembler;

      import flash.display.Bitmap;
      import flash.display.Sprite;
      import flash.display.Stage3D;
      import flash.display3D.Context3D;
      import flash.display3D.Context3DProgramType;
      import flash.display3D.Context3DTextureFormat;
      import flash.display3D.IndexBuffer3D;
      import flash.display3D.Program3D;
      import flash.display3D.textures.Texture;
      import flash.geom.Matrix3D;


      public class Sprite2D
      {
            private var _x:int = 0;
            private var _y:int = 0;
            private var _rotation:int = 0;
            private var _scaleX:Number = 1;
            private var _scaleY:Number = 1;

            private var W:Number = 1024;
            private var H:Number =768;
            private var sprite:Model2D;
            private var context3D:Context3D;
            private var texture:Texture;
            private var texture2:Texture;
            private var shaderProgram

rogram3D;
            private var indexBuffer:IndexBuffer3D;

            //渲染矩阵
            private var spriteMatrix:Matrix3D = new Matrix3D();

            //视图矩阵
            private var viewMatrix:Matrix3D = new Matrix3D();
            public function Sprite2D(context3D:Context3D,resClss:Class):void
            {
                     this.context3D = context3D;
                     //着色器语言
                     var vertexShader:Array =
                     [
                              "m44 op, va0, vc0", //矩阵相乘把3D矩阵转换为2D坐标输出给顶点着色器

                              "mov v0, va1" //移动UV信息到v0
                     ];

                     //汇编解释器
                     var vertexAssembler:AGALMiniAssembler = new AGALMiniAssembler();
                     //获得指定的解释器内容
                     vertexAssembler.assemble(flash.display3D.Context3DProgramType.VERTEX, vertexShader.join("\n"));


                     //模糊灰度
                     var fragmentShader:Array =
                     [
                              //获取UV插值的像素信息
                              "tex ft1, v0, fs0 <2d,linear,nomip>",
                              //判断坐标是否大于传递的常量值,把判断结果1或者0存储到ft2.x中
                              "sge ft2.x,v0.x,fc0.x",
                              //然后用像素信息乘以这个值,如果是小于输入的常量值那就是*0,自然就看不到了
                              "mul,ft1,ft1,ft2.x",
                              //最后输出
                              "mov oc, ft1"
                     ];



                     //汇编解释器
                     var fragmentAssembler:AGALMiniAssembler = new AGALMiniAssembler();

                     //获得指定的解释器内容
                     fragmentAssembler.assemble(Context3DProgramType.FRAGMENT, fragmentShader.join("\n"));

                     texture = initBitmap(resClss,Main.size);

                     //获得场景的绘图指令
                     shaderProgram = context3D.createProgram();

                     //刷新场景视图信息
                     shaderProgram.upload(vertexAssembler.agalcode, fragmentAssembler.agalcode);

                     //创建一个节点缓冲区,四边形为6个,因为顶点信息为012,023
                     indexBuffer = context3D.createIndexBuffer(6);

                     //填充三角点信息,节点的起点和终点,节点的个数,正好构成四边形
                     indexBuffer.uploadFromVector(Vector.<uint>([0, 1, 2, 0, 2, 3]), 0, 6);

            }

            /**
               * 2D正交投影算法
               */
            private static function makeOrthoProjection(w:Number, h:Number, n:Number, f:Number):Matrix3D
            {
                     return new Matrix3D(Vector.<Number>
                              ([
                                    2/w, 0  ,    0,       0,
                                    0  , 2/h,    0,       0,
                                    0  , 0  , 1/(f-n), -n/(f-n),
                                    0  , 0  ,    0,       1
                              ]));
            }

            private function initBitmap(resClass:Class,w:int):Texture
            {
                     //创建位图对象
                     var bitmap:Bitmap = new resClass();
                     //创建贴图缓冲区
                     var texture:Texture = context3D.createTexture(w,w, Context3DTextureFormat.BGRA, true);
                     //填充位图到贴图缓冲区
                     texture.uploadFromBitmapData(bitmap.bitmapData);

                     //创建显示对象,填入主场景
                     sprite = new Model2D(context3D);
                     //设置显示对象的场景和贴图缓冲区
                     return texture
            }


            public function paint():void
            {

                     sprite.width = Main.size;
                     sprite.height = Main.size;
                     //重置
                     spriteMatrix.identity();
                     //融合矩阵
                     spriteMatrix.append(sprite.matrix3D());
                     //重置
                     viewMatrix.identity();
                     //设置坐标
                     viewMatrix.appendTranslation( -W / 2, -H / 2, 0);
                     //设置比例
                     viewMatrix.appendScale(1, 1, 1);
                     //融合矩阵
                     spriteMatrix.append(viewMatrix);
                     //融合矩阵
                     spriteMatrix.append(makeOrthoProjection(W, -H, 0, 1));

                     //设置场景的绘图指令
                     context3D.setProgram(shaderProgram);

                     //上传纹理
                     sprite.paint(context3D, texture);

                     //上传3D矩阵对应AGAL中的vc0
                     context3D.setProgramConstantsFromMatrix(Context3DProgramType.VERTEX, 0, spriteMatrix, true);

                     //上传常量值
                     context3D.setProgramConstantsFromVector(Context3DProgramType.FRAGMENT, 0, Vector.<Number>([0.5,0.59,0.11,0]) );

                     //上传三角顶点索引,起点为0，画2个三角形
                     context3D.drawTriangles(indexBuffer, 0, 2);


            }

      }
/////////////////////////////////////////////////////////////////////////////////////////////
Main.as
package
{
      import flash.display.*;
      import flash.display3D.*;
      import flash.display3D.textures.*;
      import flash.events.*;
      import flash.geom.*;
      import flash.text.TextField;
      import flash.utils.*;


      public class Main extends Sprite
      {
            [Embed(source="../res/hhhh.png")]
            private static var resClass:Class;

            public static var size:int = 256;
            //重绘区域大小
            private static var W:Number = 1024;
            private static var H:Number = 768;

            //场景
            private var context3D:Context3D;

            //显示对象
            private var sprite:Sprite2D

            public static var scale:Number=1
            public function Main():void
            {
                     stage.scaleMode = StageScaleMode.NO_SCALE;

                     //获取场景
                     var stage3D:Stage3D = stage.stage3Ds[0];

                     //侦听场景创建
                     stage3D.addEventListener(Event.CONTEXT3D_CREATE, initialize);

                     //申请一个Context3D对象
                     stage3D.requestContext3D();

                     stage.addEventListener(MouseEvent.MOUSE_WHEEL,wheel)


            }

            private function wheel(e:MouseEvent):void
            {
                     trace(e.delta)
                     scale +=e.delta/50;
            }


            private function initialize(e:Event):void
            {
                     var stage3D:Stage3D = e.target as Stage3D;

                     //获得3D场景
                     context3D = stage3D.context3D;

                     //设置混色模式,正常的透明度
                     context3D.setBlendFactors(Context3DBlendFactor.SOURCE_ALPHA, Context3DBlendFactor.ONE_MINUS_SOURCE_ALPHA);

                     //创建重绘区域,消锯齿程度(0 2 4 8 16),是否具有深度缓存
                     context3D.configureBackBuffer(W, H, 16, false);

                     //关闭错误提示
                     context3D.enableErrorChecking = false;

                     //创建一个显示对象
                     sprite = new Sprite2D(context3D, resClass);

                     addEventListener(Event.ENTER_FRAME, renderFrame)

            }

            /**
               * 渲染
               * @param       e
               */
            private function renderFrame(e:Event):void
            {
                     //清屏
                     context3D.clear(0, 0, 0, 0);

                     //重绘显示对象
                     sprite.paint();

                     //重绘屏幕
                     context3D.present();
            }
      }
}

}

}