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

/**
 * @author alteredq / http://alteredqualia.com/
 */

THREE.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 );

};

THREE.FilmPass.prototype = Object.assign( Object.create( THREE.Pass.prototype ), {

	constructor: THREE.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 );

		}

	}

} );