three.js/examples/js/postprocessing/Pass.js

( function () {

	function Pass() {

		// if set to true, the pass is processed by the composer
		this.enabled = true; // if set to true, the pass indicates to swap read and write buffer after rendering

		this.needsSwap = true; // if set to true, the pass clears its buffer before rendering

		this.clear = false; // if set to true, the result of the pass is rendered to screen. This is set automatically by EffectComposer.

		this.renderToScreen = false;

	}

	Object.assign( Pass.prototype, {
		setSize: function ( ) {},
		render: function ( ) {

			console.error( 'THREE.Pass: .render() must be implemented in derived pass.' );

		}
	} ); // Helper for passes that need to fill the viewport with a single quad.
	// Important: It's actually a hack to put FullScreenQuad into the Pass namespace. This is only
	// done to make examples/js code work. Normally, FullScreenQuad should be exported
	// from this module like Pass.

	Pass.FullScreenQuad = function () {

		var camera = new THREE.OrthographicCamera( - 1, 1, 1, - 1, 0, 1 ); // https://github.com/mrdoob/three.js/pull/21358

		var geometry = new THREE.BufferGeometry();
		geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( [ - 1, 3, 0, - 1, - 1, 0, 3, - 1, 0 ], 3 ) );
		geometry.setAttribute( 'uv', new THREE.Float32BufferAttribute( [ 0, 2, 0, 0, 2, 0 ], 2 ) );

		var FullScreenQuad = function ( material ) {

			this._mesh = new THREE.Mesh( geometry, material );

		};

		Object.defineProperty( FullScreenQuad.prototype, 'material', {
			get: function () {

				return this._mesh.material;

			},
			set: function ( value ) {

				this._mesh.material = value;

			}
		} );
		Object.assign( FullScreenQuad.prototype, {
			dispose: function () {

				this._mesh.geometry.dispose();

			},
			render: function ( renderer ) {

				renderer.render( this._mesh, camera );

			}
		} );
		return FullScreenQuad;

	}();

	THREE.Pass = Pass;

} )();