Add a powerPreference option

Not sure how to add this here's an attempt.

You can pass `powerPreference=low-power` or
`power-preference=high-performance` in the query string.

src/common/runtime/standalone.ts

@@ -9,6 +9,7 @@ import { parseQuery } from '../internal/query/parseQuery.js';
 import { TestQueryLevel } from '../internal/query/query.js';
 import { TestTreeNode, TestSubtree, TestTreeLeaf, TestTree } from '../internal/tree.js';
 import { assert, ErrorWithExtra } from '../util/util.js';
+import { setDefaultRequestAdapterOptions } from '../util/navigator_gpu.js';
 
 import { optionEnabled } from './helper/options.js';
 import { TestWorker } from './helper/test_worker.js';
@@ -33,6 +34,11 @@ const worker = optionEnabled('worker') ? new TestWorker(debug) : undefined;
 const autoCloseOnPass = document.getElementById('autoCloseOnPass') as HTMLInputElement;
 const resultsVis = document.getElementById('resultsVis')!;
 
+const powerPreference = new URLSearchParams(window.location.search).get('powerPreference');
+if (powerPreference) {
+  setDefaultRequestAdapterOptions({ powerPreference: powerPreference as GPUPowerPreference });
+}
+
 dataCache.setStore({
   load: async (path: string) => {
     const response = await fetch(`data/${path}`);

src/common/util/navigator_gpu.ts

@@ -32,6 +32,15 @@ export function setGPUProvider(provider: GPUProvider) {
 
 let impl: GPU | undefined = undefined;
 
+let defaultRequestAdapterOptions: GPURequestAdapterOptions | undefined;
+
+export function setDefaultRequestAdapterOptions(options: GPURequestAdapterOptions) {
+  if (impl) {
+    throw new Error('must call setDefaultRequestAdapterOptions before getGPU');
+  }
+  defaultRequestAdapterOptions = { ...options };
+}
+
 /**
  * Finds and returns the `navigator.gpu` object (or equivalent, for non-browser implementations).
  * Throws an exception if not found.
@@ -43,5 +52,23 @@ export function getGPU(): GPU {
 
   impl = gpuProvider();
 
+  if (defaultRequestAdapterOptions) {
+    // eslint-disable-next-line @typescript-eslint/unbound-method
+    const oldFn = impl.requestAdapter;
+    impl.requestAdapter = function (
+      options?: GPURequestAdapterOptions
+    ): Promise<GPUAdapter | null> {
+      const promise = oldFn.call(this, { ...defaultRequestAdapterOptions, ...(options || {}) });
+      void promise.then(async adapter => {
+        if (adapter) {
+          const info = await adapter.requestAdapterInfo();
+          // eslint-disable-next-line no-console
+          console.log(info);
+        }
+      });
+      return promise;
+    };
+  }
+
   return impl;
 }