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src/utils/graphics/initialize-gpu.test.ts

@@ -0,0 +1,100 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import { initializeGpu } from './initialize-gpu';
+
+const limits = {
+  maxBufferSize: 1024,
+  maxComputeWorkgroupsPerDimension: 16,
+  maxStorageBufferBindingSize: 1024,
+} as unknown as GPUSupportedLimits;
+
+const createDevice = (): GPUDevice =>
+  ({
+    addEventListener: vi.fn(),
+    lost: new Promise(() => undefined),
+  }) as unknown as GPUDevice;
+
+const createAdapter = (features: Array<GPUFeatureName> = []): GPUAdapter => {
+  const device = createDevice();
+  return {
+    features: new Set(features),
+    info: {},
+    limits,
+    requestDevice: vi.fn().mockResolvedValue(device),
+  } as unknown as GPUAdapter;
+};
+
+const stubSecureWebGpu = (requestAdapter: GPU['requestAdapter']): void => {
+  vi.stubGlobal('window', { isSecureContext: true });
+  vi.stubGlobal('navigator', {
+    gpu: {
+      requestAdapter,
+    },
+  });
+};
+
+describe('initializeGpu', () => {
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  it('starts with the least demanding compatibility adapter request', async () => {
+    const adapter = createAdapter();
+    const requestAdapter = vi.fn().mockResolvedValue(adapter);
+    stubSecureWebGpu(requestAdapter as GPU['requestAdapter']);
+
+    await initializeGpu();
+
+    expect(requestAdapter).toHaveBeenNthCalledWith(1, {
+      featureLevel: 'compatibility',
+    });
+    expect(requestAdapter).toHaveBeenCalledTimes(1);
+    expect(adapter.requestDevice).toHaveBeenCalled();
+  });
+
+  it('continues trying adapters if one request throws', async () => {
+    const adapter = createAdapter();
+    const requestAdapter = vi
+      .fn()
+      .mockRejectedValueOnce(new Error('adapter request failed'))
+      .mockResolvedValueOnce(adapter);
+    stubSecureWebGpu(requestAdapter as GPU['requestAdapter']);
+
+    await expect(initializeGpu()).resolves.toBeDefined();
+    expect(requestAdapter).toHaveBeenCalledTimes(2);
+  });
+
+  it('falls back through core and high-performance adapter requests', async () => {
+    const adapter = createAdapter();
+    const requestAdapter = vi
+      .fn()
+      .mockResolvedValueOnce(null)
+      .mockResolvedValueOnce(null)
+      .mockResolvedValueOnce(adapter);
+    stubSecureWebGpu(requestAdapter as GPU['requestAdapter']);
+
+    await initializeGpu();
+
+    expect(requestAdapter).toHaveBeenNthCalledWith(1, {
+      featureLevel: 'compatibility',
+    });
+    expect(requestAdapter).toHaveBeenNthCalledWith(2, undefined);
+    expect(requestAdapter).toHaveBeenNthCalledWith(3, {
+      featureLevel: 'compatibility',
+      powerPreference: 'high-performance',
+    });
+    expect(adapter.requestDevice).toHaveBeenCalled();
+  });
+
+  it('requests only the core feature when the adapter exposes optional features', async () => {
+    const adapter = createAdapter(['core-features-and-limits', 'timestamp-query']);
+    const requestAdapter = vi.fn().mockResolvedValue(adapter);
+    stubSecureWebGpu(requestAdapter as GPU['requestAdapter']);
+
+    await initializeGpu();
+
+    expect(adapter.requestDevice).toHaveBeenCalledWith({
+      requiredFeatures: ['core-features-and-limits'],
+    });
+  });
+});