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<!DOCTYPE HTML>
<html>
<head>
<meta charset='utf-8'>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
</head>
<body>
<script>
ok(SpecialPowers.getBoolPref('dom.webgpu.enabled'), 'Pref should be enabled.');
const func = async function() {
const adapter = await navigator.gpu.requestAdapter();
const device = await adapter.requestDevice();
const bufferRead = device.createBuffer({ size:4, usage: GPUBufferUsage.MAP_READ | GPUBufferUsage.COPY_DST });
const bufferWrite = device.createBuffer({ size:4, usage: GPUBufferUsage.COPY_SRC, mappedAtCreation: true });
(new Float32Array(bufferWrite.getMappedRange())).set([1.0]);
bufferWrite.unmap();
const encoder = device.createCommandEncoder();
encoder.copyBufferToBuffer(bufferWrite, 0, bufferRead, 0, 4);
device.defaultQueue.submit([encoder.finish()]);
await bufferRead.mapAsync(GPUMapMode.READ);
const data = bufferRead.getMappedRange();
const value = (new Float32Array(data))[0];
bufferRead.unmap();
ok(value == 1.0, 'value == 1.0');
};
SimpleTest.waitForExplicitFinish();
func().finally(() => SimpleTest.finish());
</script>
</body>
</html>
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