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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.');
async function testBody() {
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.queue.submit([encoder.finish()]);
await bufferRead.mapAsync(GPUMapMode.READ);
try {
bufferRead.getMappedRange(0, 5);
ok(false, 'mapped with size outside buffer should throw');
} catch(e) {
ok(true, 'mapped with size outside buffer should throw OperationError');
}
try {
bufferRead.getMappedRange(4, 1);
ok(false, 'mapped with offset outside buffer should throw');
} catch(e) {
ok(true, 'mapped with offset outside buffer should throw OperationError');
}
const data = bufferRead.getMappedRange();
is(data.byteLength, 4, 'array should be 4 bytes long');
const value = (new Float32Array(data))[0];
ok(value == 1.0, 'value == 1.0');
bufferRead.unmap();
is(data.byteLength, 0, 'array should be detached after explicit unmap');
};
SimpleTest.waitForExplicitFinish();
testBody()
.catch((e) => ok(false, "Unhandled exception " + e))
.finally(() => SimpleTest.finish());
</script>
</body>
</html>
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