module es {
    export class PostProcessor {
        public enabled: boolean;
        public effect: egret.Filter;
        public scene: Scene;
        public shape: egret.Shape;

        public static default_vert = "attribute vec2 aVertexPosition;\n" +
            "attribute vec2 aTextureCoord;\n" +
            "attribute vec2 aColor;\n" +

            "uniform vec2 projectionVector;\n" +
            //"uniform vec2 offsetVector;\n" +

            "varying vec2 vTextureCoord;\n" +
            "varying vec4 vColor;\n" +

            "const vec2 center = vec2(-1.0, 1.0);\n" +

            "void main(void) {\n" +
            "gl_Position = vec4( (aVertexPosition / projectionVector) + center , 0.0, 1.0);\n" +
            "vTextureCoord = aTextureCoord;\n" +
            "vColor = vec4(aColor.x, aColor.x, aColor.x, aColor.x);\n" +
            "}";

        constructor(effect: egret.Filter = null){
            this.enabled = true;
            this.effect = effect;
        }

        public onAddedToScene(scene: Scene){
            this.scene = scene;
            this.shape = new egret.Shape();
            this.shape.graphics.beginFill(0xFFFFFF, 1);
            this.shape.graphics.drawRect(0, 0, Core.graphicsDevice.viewport.width, Core.graphicsDevice.viewport.height);
            this.shape.graphics.endFill();
            scene.addChild(this.shape);
        }

        public process(){
            this.drawFullscreenQuad();
        }

        public onSceneBackBufferSizeChanged(newWidth: number, newHeight: number){}

        protected drawFullscreenQuad(){
            this.scene.filters = [this.effect];
            // this.shape.filters = [this.effect];
        }

        public unload(){
            if (this.effect){
                this.effect = null;
            }

            this.scene.removeChild(this.shape);
            this.scene = null;
        }
    }
}