Rewrite core around shared rows and render graphs

Co-authored-by: Heaust Azure <heaust.azure@gmail.com>
Amp-Thread-ID: https://ampcode.com/threads/T-01a01380-b478-77d0-84a0-102880a5c5ae

addons/render-graph-fxnode/src/index.js

@@ -1,6 +1,18 @@
-// FXNode is an optional authoring frontend. Its exporter is intentionally the only
-// FXNode-aware code that feeds the canonical AST package.
-export {
-  adaptFxNodeSnapshot,
-  mapAuthoringDiagnostic,
-} from "./adapter.js";
+import { createGraphAst } from "@yawn/render-graph-ast";
+
+/** Exports FXNode nodes with a `pass` payload and links as the canonical pass DAG. */
+export function adaptFxNodeSnapshot(snapshot, { pipelines = {}, resources = {} } = {}) {
+  if (!Array.isArray(snapshot?.nodes) || !Array.isArray(snapshot?.links)) throw new TypeError("FXNODE_GRAPH");
+  const passes = snapshot.nodes.map(node => {
+    if (!node?.id || !node.pass) throw new TypeError("FXNODE_PASS");
+    return { ...structuredClone(node.pass), id: node.id, after: [...(node.pass.after ?? [])] };
+  });
+  const byId = new Map(passes.map(pass => [pass.id, pass]));
+  for (const link of snapshot.links) {
+    const source = link.fromNodeId ?? link.from?.node;
+    const target = link.toNodeId ?? link.to?.node;
+    if (!byId.has(source) || !byId.has(target)) throw new TypeError("FXNODE_LINK");
+    if (!byId.get(target).after.includes(source)) byId.get(target).after.push(source);
+  }
+  return createGraphAst({ id: snapshot.graphId ?? "fxnode", pipelines, resources, passes });
+}