Add Chromium-only Blender WebEngine parity work

web/protocol/engine.ts

@@ -0,0 +1,33 @@
+import type { ErrorReport } from "./error";
+import type { ProgressEvent } from "./progress";
+import type { SceneSnapshotIR } from "./scene-ir";
+
+export type EngineCommand =
+  | { type: "init"; protocolVersion: number }
+  | { type: "getSceneSnapshot"; sinceRevision?: number }
+  | { type: "setFrame"; frame: number }
+  | { type: "setObjectVisibility"; objectId: string; visible: boolean }
+  | { type: "shutdown" };
+
+export interface EngineRequest {
+  requestId: string;
+  expectedRevision: number;
+  command: EngineCommand;
+}
+
+export interface EngineCapabilities {
+  engine: "mock" | "blender-wasm";
+  protocolVersion: number;
+  supportsBlend: boolean;
+  supportsMeshEdit: boolean;
+}
+
+export interface EngineResponse {
+  requestId: string;
+  ok: boolean;
+  revision: number;
+  capabilities?: EngineCapabilities;
+  snapshot?: SceneSnapshotIR;
+  progress?: ProgressEvent;
+  reports?: ErrorReport[];
+}