simplify more

src/utils/graphics/bind-group-cache.ts

@@ -0,0 +1,19 @@
+export const createBindGroupCache = <K1 extends object, K2 extends object>(
+  factory: (key1: K1, key2: K2) => GPUBindGroup
+): ((key1: K1, key2: K2) => GPUBindGroup) => {
+  const outer = new WeakMap<K1, WeakMap<K2, GPUBindGroup>>();
+  return (key1, key2) => {
+    let inner = outer.get(key1);
+    if (!inner) {
+      inner = new WeakMap();
+      outer.set(key1, inner);
+    }
+    const cached = inner.get(key2);
+    if (cached) {
+      return cached;
+    }
+    const bindGroup = factory(key1, key2);
+    inner.set(key2, bindGroup);
+    return bindGroup;
+  };
+};