three.js/examples/js/nodes/postprocessing/NodePostProcessing.js

/**
 * @author sunag / http://www.sunag.com.br/
 */

import { NodeMaterial } from '../materials/NodeMaterial.js';
import { ScreenNode } from '../inputs/ScreenNode.js';

function NodePostProcessing( renderer, renderTarget ) {

	if ( renderTarget === undefined ) {

		var parameters = {
			minFilter: THREE.LinearFilter,
			magFilter: THREE.LinearFilter,
			format: THREE.RGBAFormat,
			stencilBuffer: false
		};

		var size = renderer.getDrawingBufferSize();
		renderTarget = new THREE.WebGLRenderTarget( size.width, size.height, parameters );

	}
	
	this.renderer = renderer;
	this.renderTarget = renderTarget;

	this.output = new ScreenNode();
	this.material = new NodeMaterial();

	this.camera = new THREE.OrthographicCamera( - 1, 1, 1, - 1, 0, 1 );
	this.scene = new THREE.Scene();

	this.quad = new THREE.Mesh( new THREE.PlaneBufferGeometry( 2, 2 ), this.material );
	this.quad.frustumCulled = false; // Avoid getting clipped
	this.scene.add( this.quad );
	
	this.needsUpdate = true;

};

NodePostProcessing.prototype = {

	constructor: NodePostProcessing,

	render: function ( scene, camera, frame ) {
		
		if ( this.needsUpdate ) {

			this.material.dispose();

			this.material.fragment.value = this.output;
			this.material.build();

			if (this.material.uniforms.renderTexture) {
				
				this.material.uniforms.renderTexture.value = this.renderTarget.texture;
				
			}

			this.needsUpdate = false;

		}

		frame.setRenderer( this.renderer )
			.setRenderTexture( this.renderTarget.texture );
		
		this.renderer.render( scene, camera, this.renderTarget );

		frame.updateNode( this.material );
		
		this.renderer.render( this.scene, this.camera );
		
	},
	
	setSize: function ( width, height ) {
		
		this.renderTarget.setSize( width, height );
	
		this.renderer.setSize( width, height );
		
	},
	
	copy: function ( source ) {
		
		this.material = source.material;
		
	},
	
	toJSON: function ( meta ) {
		
		var isRootObject = ( meta === undefined || typeof meta === 'string' );

		if ( isRootObject ) {

			meta = {
				nodes: {}
			};

		}

		if ( meta && ! meta.post ) meta.post = {};

		if ( ! meta.post[ this.uuid ] ) {

			var data = {};

			data.uuid = this.uuid;
			data.type = "NodePostProcessing";

			meta.post[ this.uuid ] = data;

			if ( this.name !== "" ) data.name = this.name;

			if ( JSON.stringify( this.userData ) !== '{}' ) data.userData = this.userData;

			data.material = this.material.toJSON( meta ).uuid;

		}

		meta.post = this.uuid;

		return meta;
		
	}
	
};

export { NodePostProcessing };