three.js/examples/jsm/nodes/utils/StorageArrayElementNode.js

import { addNodeClass } from '../core/Node.js';
import { nodeProxy, addNodeElement } from '../shadernode/ShaderNode.js';
import ArrayElementNode from './ArrayElementNode.js';

class StorageArrayElementNode extends ArrayElementNode {

	constructor( storageBufferNode, indexNode ) {

		super( storageBufferNode, indexNode );

		this.isStorageArrayElementNode = true;

	}

	set storageBufferNode( value ) {

		this.node = value;

	}

	get storageBufferNode() {

		return this.node;

	}

	setup( builder ) {

		if ( builder.isAvailable( 'storageBuffer' ) === false ) {

			if ( ! this.node.instanceIndex && this.node.bufferObject === true ) {

				builder.setupPBO( this.node );

			}

		}

		return super.setup( builder );

	}

	generate( builder, output ) {

		let snippet;

		const isAssignContext = builder.context.assign;

		//

		if ( builder.isAvailable( 'storageBuffer' ) === false ) {

			const { node } = this;

			if ( ! node.instanceIndex && this.node.bufferObject === true && isAssignContext !== true ) {

				snippet = builder.generatePBO( this );

			} else {

				snippet = node.build( builder );

			}

		} else {

			snippet = super.generate( builder );

		}

		if ( isAssignContext !== true ) {

			const type = this.getNodeType( builder );

			snippet = builder.format( snippet, type, output );

		}

		return snippet;

	}

}

export default StorageArrayElementNode;

export const storageElement = nodeProxy( StorageArrayElementNode );

addNodeElement( 'storageElement', storageElement );

addNodeClass( 'StorageArrayElementNode', StorageArrayElementNode );