three.js/examples/jsm/nodes/code/FunctionCallNode.js

import TempNode from '../core/TempNode.js';
import { addNodeClass } from '../core/Node.js';
import { addNodeElement, nodeArray, nodeObject, nodeObjects } from '../shadernode/ShaderNode.js';

class FunctionCallNode extends TempNode {

	constructor( functionNode = null, parameters = {} ) {

		super();

		this.functionNode = functionNode;
		this.parameters = parameters;

	}

	setParameters( parameters ) {

		this.parameters = parameters;

		return this;

	}

	getParameters() {

		return this.parameters;

	}

	getNodeType( builder ) {

		return this.functionNode.getNodeType( builder );

	}

	generate( builder ) {

		const params = [];

		const functionNode = this.functionNode;

		const inputs = functionNode.getInputs( builder );
		const parameters = this.parameters;

		if ( Array.isArray( parameters ) ) {

			for ( let i = 0; i < parameters.length; i ++ ) {

				const inputNode = inputs[ i ];
				const node = parameters[ i ];

				params.push( node.build( builder, inputNode.type ) );

			}

		} else {

			for ( const inputNode of inputs ) {

				const node = parameters[ inputNode.name ];

				if ( node !== undefined ) {

					params.push( node.build( builder, inputNode.type ) );

				} else {

					throw new Error( `FunctionCallNode: Input '${inputNode.name}' not found in FunctionNode.` );

				}

			}

		}

		const functionName = functionNode.build( builder, 'property' );

		return `${functionName}( ${params.join( ', ' )} )`;

	}

}

export default FunctionCallNode;

export const call = ( func, ...params ) => {

	params = params.length > 1 || ( params[ 0 ] && params[ 0 ].isNode === true ) ? nodeArray( params ) : nodeObjects( params[ 0 ] );

	return nodeObject( new FunctionCallNode( nodeObject( func ), params ) );

};

addNodeElement( 'call', call );

addNodeClass( 'FunctionCallNode', FunctionCallNode );