three.js/examples/js/postprocessing/FilmPass.js

( function () {

	var FilmPass = function ( noiseIntensity, scanlinesIntensity, scanlinesCount, grayscale ) {

		THREE.Pass.call( this );
		if ( THREE.FilmShader === undefined ) console.error( 'THREE.FilmPass relies on THREE.FilmShader' );
		var shader = THREE.FilmShader;
		this.uniforms = THREE.UniformsUtils.clone( shader.uniforms );
		this.material = new THREE.ShaderMaterial( {
			uniforms: this.uniforms,
			vertexShader: shader.vertexShader,
			fragmentShader: shader.fragmentShader
		} );
		if ( grayscale !== undefined ) this.uniforms.grayscale.value = grayscale;
		if ( noiseIntensity !== undefined ) this.uniforms.nIntensity.value = noiseIntensity;
		if ( scanlinesIntensity !== undefined ) this.uniforms.sIntensity.value = scanlinesIntensity;
		if ( scanlinesCount !== undefined ) this.uniforms.sCount.value = scanlinesCount;
		this.fsQuad = new THREE.Pass.FullScreenQuad( this.material );

	};

	FilmPass.prototype = Object.assign( Object.create( THREE.Pass.prototype ), {
		constructor: FilmPass,
		render: function ( renderer, writeBuffer, readBuffer, deltaTime
			/*, maskActive */
		) {

			this.uniforms[ 'tDiffuse' ].value = readBuffer.texture;
			this.uniforms[ 'time' ].value += deltaTime;

			if ( this.renderToScreen ) {

				renderer.setRenderTarget( null );
				this.fsQuad.render( renderer );

			} else {

				renderer.setRenderTarget( writeBuffer );
				if ( this.clear ) renderer.clear();
				this.fsQuad.render( renderer );

			}

		}
	} );

	THREE.FilmPass = FilmPass;

} )();