TSL: Introduce after and before

Author: sunag

src/nodes/Nodes.js

@@ -35,6 +35,7 @@ export { default as VaryingNode, varying } from './core/VaryingNode.js';
 export { default as OutputStructNode, outputStruct } from './core/OutputStructNode.js';
 export { default as MRTNode, mrt } from './core/MRTNode.js';
 export { default as NodeHandler } from './core/NodeHandler.js';
+export { default as AfterNode, after, before } from './utils/AfterNode.js';
 
 import * as NodeUtils from './core/NodeUtils.js';
 export { NodeUtils };

src/nodes/utils/AfterNode.js

@@ -0,0 +1,38 @@
+import Node from '../core/Node.js';
+import { nodeProxy, addNodeElement } from '../shadernode/ShaderNode.js';
+
+class AfterNode extends Node {
+
+	constructor( node, afterNode ) {
+
+		super( 'void' );
+
+		this.node = node;
+		this.afterNode = afterNode;
+
+	}
+
+	getNodeType( builder ) {
+
+		return this.afterNode.getNodeType( builder );
+
+	}
+
+	setup( builder ) {
+
+		this.node.build( builder );
+
+		return this.afterNode;
+
+	}
+
+}
+
+export const after = nodeProxy( AfterNode );
+export const before = ( node, afterNode ) => after( afterNode, node );
+
+addNodeElement( 'after', after );
+addNodeElement( 'before', before );
+
+export default AfterNode;
+