three.js/examples/js/postprocessing/DotScreenPass.js

( function () {

	var DotScreenPass = function ( center, angle, scale ) {

		THREE.Pass.call( this );
		if ( THREE.DotScreenShader === undefined ) console.error( 'THREE.DotScreenPass relies on THREE.DotScreenShader' );
		var shader = THREE.DotScreenShader;
		this.uniforms = THREE.UniformsUtils.clone( shader.uniforms );
		if ( center !== undefined ) this.uniforms[ 'center' ].value.copy( center );
		if ( angle !== undefined ) this.uniforms[ 'angle' ].value = angle;
		if ( scale !== undefined ) this.uniforms[ 'scale' ].value = scale;
		this.material = new THREE.ShaderMaterial( {
			uniforms: this.uniforms,
			vertexShader: shader.vertexShader,
			fragmentShader: shader.fragmentShader
		} );
		this.fsQuad = new THREE.Pass.FullScreenQuad( this.material );

	};

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

			this.uniforms[ 'tDiffuse' ].value = readBuffer.texture;
			this.uniforms[ 'tSize' ].value.set( readBuffer.width, readBuffer.height );

			if ( this.renderToScreen ) {

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

			} else {

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

			}

		}
	} );

	THREE.DotScreenPass = DotScreenPass;

} )();