module BABYLON {
    /**
     * The GrainPostProcess adds noise to the image at mid luminance levels
     */
    export class GrainPostProcess extends PostProcess {
        /**
         * The intensity of the grain added (default: 30)
         */
        public intensity:number = 30;
        /**
         * If the grain should be randomized on every frame
         */
        public animated:boolean = false;
        
        /**
         * Creates a new instance of @see GrainPostProcess
         * @param name The name of the effect.
         * @param options The required width/height ratio to downsize to before computing the render pass.
         * @param camera The camera to apply the render pass to.
         * @param samplingMode The sampling mode to be used when computing the pass. (default: 0)
         * @param engine The engine which the post process will be applied. (default: current engine)
         * @param reusable If the post process can be reused on the same frame. (default: false)
         * @param textureType Type of textures used when performing the post process. (default: 0)
         * @param blockCompilation If compilation of the shader should not be done in the constructor. The updateEffect method can be used to compile the shader at a later time. (default: false)
         */
        constructor(name: string, options: number | PostProcessOptions, camera: Nullable<Camera>, samplingMode?: number, engine?: Engine, reusable?: boolean, textureType: number = Engine.TEXTURETYPE_UNSIGNED_INT, blockCompilation = false) {
            super(name, "grain", ["intensity", "animatedSeed"], [], options, camera, samplingMode, engine, reusable, null, textureType, undefined, null, blockCompilation);
            this.onApplyObservable.add((effect: Effect) => {
                effect.setFloat('intensity', this.intensity);
                effect.setFloat('animatedSeed', this.animated ? Math.random() + 1 : 1);
            })
        }
    }
}