1 files changed, 78 insertions, 0 deletions
diff --git a/dom/webgpu/tests/cts/checkout/src/stress/shaders/entry_points.spec.ts b/dom/webgpu/tests/cts/checkout/src/stress/shaders/entry_points.spec.ts
new file mode 100644
index 0000000000..95b647ba73
--- /dev/null
+++ b/dom/webgpu/tests/cts/checkout/src/stress/shaders/entry_points.spec.ts
@@ -0,0 +1,78 @@
+export const description = `
+Stress tests covering behavior around shader entry points.
+`;
+
+import { makeTestGroup } from '../../common/framework/test_group.js';
+import { range } from '../../common/util/util.js';
+import { GPUTest } from '../../webgpu/gpu_test.js';
+
+export const g = makeTestGroup(GPUTest);
+
+const makeCode = (numEntryPoints: number) => {
+  const kBaseCode = `
+      struct Buffer { data: u32, };
+      @group(0) @binding(0) var<storage, read_write> buffer: Buffer;
+      fn main() { buffer.data = buffer.data + 1u;  }
+      `;
+  const makeEntryPoint = (i: number) => `
+      @compute @workgroup_size(1) fn computeMain${i}() { main(); }
+      `;
+  return kBaseCode + range(numEntryPoints, makeEntryPoint).join('');
+};
+
+g.test('many')
+  .desc(
+    `Tests compilation and usage of shaders with a huge number of entry points.
+
+TODO: There may be a normative limit to the number of entry points allowed in
+a shader, in which case this would become a validation test instead.`
+  )
+  .fn(async t => {
+    const data = new Uint32Array([0]);
+    const buffer = t.makeBufferWithContents(data, GPUBufferUsage.STORAGE | GPUBufferUsage.COPY_SRC);
+
+    // NOTE: Initial shader compilation time seems to scale exponentially with
+    // this value in Chrome.
+    const kNumEntryPoints = 200;
+
+    const shader = t.device.createShaderModule({
+      code: makeCode(kNumEntryPoints),
+    });
+
+    const layout = t.device.createBindGroupLayout({
+      entries: [
+        {
+          binding: 0,
+          visibility: GPUShaderStage.COMPUTE,
+          buffer: { type: 'storage' },
+        },
+      ],
+    });
+    const pipelineLayout = t.device.createPipelineLayout({
+      bindGroupLayouts: [layout],
+    });
+    const bindGroup = t.device.createBindGroup({
+      layout,
+      entries: [{ binding: 0, resource: { buffer } }],
+    });
+
+    const encoder = t.device.createCommandEncoder();
+    range(kNumEntryPoints, i => {
+      const pipeline = t.device.createComputePipeline({
+        layout: pipelineLayout,
+        compute: {
+          module: shader,
+          entryPoint: `computeMain${i}`,
+        },
+      });
+
+      const pass = encoder.beginComputePass();
+      pass.setPipeline(pipeline);
+      pass.setBindGroup(0, bindGroup);
+      pass.dispatchWorkgroups(1);
+      pass.end();
+    });
+
+    t.device.queue.submit([encoder.finish()]);
+    t.expectGPUBufferValuesEqual(buffer, new Uint32Array([kNumEntryPoints]));
+  });