three.js/src/nodes/accessors/CubeTextureNode.js

import TextureNode from './TextureNode.js';
import { reflectVector, refractVector } from './ReflectVectorNode.js';
import { addNodeClass } from '../core/Node.js';
import { addNodeElement, nodeProxy, vec3 } from '../shadernode/ShaderNode.js';

import { CubeReflectionMapping, CubeRefractionMapping, WebGPUCoordinateSystem } from '../../constants.js';

class CubeTextureNode extends TextureNode {

	constructor( value, uvNode = null, levelNode = null, biasNode = null ) {

		super( value, uvNode, levelNode, biasNode );

		this.isCubeTextureNode = true;

	}

	getInputType( /*builder*/ ) {

		return 'cubeTexture';

	}

	getDefaultUV() {

		const texture = this.value;

		if ( texture.mapping === CubeReflectionMapping ) {

			return reflectVector;

		} else if ( texture.mapping === CubeRefractionMapping ) {

			return refractVector;

		} else {

			console.error( 'THREE.CubeTextureNode: Mapping "%s" not supported.', texture.mapping );

			return vec3( 0, 0, 0 );

		}

	}

	setUpdateMatrix( /*updateMatrix*/ ) { } // Ignore .updateMatrix for CubeTextureNode

	setupUV( builder, uvNode ) {

		const texture = this.value;

		if ( builder.renderer.coordinateSystem === WebGPUCoordinateSystem || ! texture.isRenderTargetTexture ) {

			return vec3( uvNode.x.negate(), uvNode.yz );

		} else {

			return uvNode;

		}

	}

	generateUV( builder, cubeUV ) {

		return cubeUV.build( builder, 'vec3' );

	}

}

export default CubeTextureNode;

export const cubeTexture = nodeProxy( CubeTextureNode );

addNodeElement( 'cubeTexture', cubeTexture );

addNodeClass( 'CubeTextureNode', CubeTextureNode );