1 files changed, 23 insertions, 0 deletions
diff --git a/dom/webgpu/tests/cts/checkout/src/webgpu/util/buffer.ts b/dom/webgpu/tests/cts/checkout/src/webgpu/util/buffer.ts
new file mode 100644
index 0000000000..a7d154a7e6
--- /dev/null
+++ b/dom/webgpu/tests/cts/checkout/src/webgpu/util/buffer.ts
@@ -0,0 +1,23 @@
+import { memcpy, TypedArrayBufferView } from '../../common/util/util.js';
+
+import { align } from './math.js';
+
+/**
+ * Creates a buffer with the contents of some TypedArray.
+ * The buffer size will always be aligned to 4 as we set mappedAtCreation === true when creating the
+ * buffer.
+ */
+export function makeBufferWithContents(
+  device: GPUDevice,
+  dataArray: TypedArrayBufferView,
+  usage: GPUBufferUsageFlags
+): GPUBuffer {
+  const buffer = device.createBuffer({
+    mappedAtCreation: true,
+    size: align(dataArray.byteLength, 4),
+    usage,
+  });
+  memcpy({ src: dataArray }, { dst: buffer.getMappedRange() });
+  buffer.unmap();
+  return buffer;
+}