text: import Node from '../core/Node.js';
  import UVNode from '../accessors/UVNode.js';
  
  import { ShaderNode, add, mul, floor, mod, sign } from '../ShaderNode.js';
  
  const checkerShaderNode = new ShaderNode( ( inputs ) => {
  
  	const uv = mul( inputs.uv, 2.0 );
  
  	const cx = floor( uv.x );
  	const cy = floor( uv.y );
  	const result = mod( add( cx, cy ), 2.0 );
  
  	return sign( result );
  
  } );
  
  class CheckerNode extends Node {
  
  	constructor( uvNode = new UVNode() ) {
  
  		super( 'float' );
  
  		this.uvNode = uvNode;
  
  	}
  
  	generate( builder ) {
  
  		return checkerShaderNode( { uv: this.uvNode } ).build( builder );
  
  	}
  
  }
  
  export default CheckerNode;
  