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

( function () {

	class FilmPass extends THREE.Pass {

		constructor( noiseIntensity, scanlinesIntensity, scanlinesCount, grayscale ) {

			super();
			if ( THREE.FilmShader === undefined ) console.error( 'THREE.FilmPass relies on THREE.FilmShader' );
			const 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.FullScreenQuad( this.material );

		}
		render( 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 );

			}

		}
		dispose() {

			this.material.dispose();
			this.fsQuad.dispose();

		}

	}

	THREE.FilmPass = FilmPass;

} )();