three.js/examples/js/nodes/misc/TextureCubeNode.js

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

import { TempNode } from '../core/TempNode.js';
import { TextureCubeUVNode } from './TextureCubeUVNode.js';
import { ColorSpaceNode } from '../utils/ColorSpaceNode.js';

function TextureCubeNode( value, uv ) {

	TempNode.call( this, 'v4' );

	this.value = value;
	this.uv = uv || new TextureCubeUVNode();

}

TextureCubeNode.prototype = Object.create( TempNode.prototype );
TextureCubeNode.prototype.constructor = TextureCubeNode;
TextureCubeNode.prototype.nodeType = "TextureCube";

TextureCubeNode.prototype.generate = function ( builder, output ) {

	if ( builder.isShader( 'fragment' ) ) {

		var uv_10 = this.uv.build( builder ) + '.uv_10',
			uv_20 = this.uv.build( builder ) + '.uv_20',
			t = this.uv.build( builder ) + '.t';

		var texture = this.value && this.value.value;
		var format = texture && texture.encoding || THREE.LinearEncoding;
		var decoding = ColorSpaceNode.prototype.getDecodingMethod(format);
		function decode(input) {
			return decoding[0] + '( ' + input +
				(decoding[1] !== undefined ? ', ' + decoding[1] : '') +
				' )';
		}

		var color10 = 'texture2D( ' + this.value.build( builder, 'sampler2D' ) + ', ' + uv_10 + ' )';
		color10 = decode(color10);

		var color20 = 'texture2D( ' + this.value.build( builder, 'sampler2D' ) + ', ' + uv_20 + ' )';
		color20 = decode(color20);

		return builder.format( 'vec4( mix( ' + color10 + ', ' + color20 + ', ' + t + ' ).rgb, 1.0 )', this.getType( builder ), output );

	} else {

		console.warn( "THREE.TextureCubeNode is not compatible with " + builder.shader + " shader." );

		return builder.format( 'vec4( 0.0 )', this.getType( builder ), output );

	}

};

TextureCubeNode.prototype.toJSON = function ( meta ) {

	var data = this.getJSONNode( meta );

	if ( ! data ) {

		data = this.createJSONNode( meta );

		data.uv = this.uv.toJSON( meta ).uuid;
		data.textureSize = this.textureSize.toJSON( meta ).uuid;
		data.blinnExponentToRoughness = this.blinnExponentToRoughness.toJSON( meta ).uuid;

		if ( this.roughness ) data.roughness = this.roughness.toJSON( meta ).uuid;

	}

	return data;

};

export { TextureCubeNode };