<!DOCTYPE html>
<html>
<head>
<script src="../resources/js-test-pre.js"></script>
</head>
<body>
<script>
const shaderSource = `
[numthreads(1, 1, 1)]
compute void computeShader(device uint[] buffer : register(u0), float3 threadID : SV_DispatchThreadID) {
    buffer[0] = buffer.length;
}
`;
let resultUint32Array;
async function start() {
    const adapter = await navigator.gpu.requestAdapter();
    const device = await adapter.requestDevice();

    const shaderModule = device.createShaderModule({code: shaderSource, isWHLSL: true});
    const computeStage = {module: shaderModule, entryPoint: "computeShader"};

    const bindGroupLayoutDescriptor = {bindings: [{binding: 0, visibility: 7, type: "storage-buffer"}]};
    const bindGroupLayout = device.createBindGroupLayout(bindGroupLayoutDescriptor);
    const pipelineLayoutDescriptor = {bindGroupLayouts: [bindGroupLayout]};
    const pipelineLayout = device.createPipelineLayout(pipelineLayoutDescriptor);

    const computePipelineDescriptor = {computeStage, layout: pipelineLayout};
    const computePipeline = device.createComputePipeline(computePipelineDescriptor);

    const size = Uint32Array.BYTES_PER_ELEMENT * 1337;

    const bufferDescriptor = {size, usage: GPUBufferUsage.MAP_WRITE | GPUBufferUsage.TRANSFER_SRC};
    const buffer = device.createBuffer(bufferDescriptor);
    const bufferArrayBuffer = await buffer.mapWriteAsync();
    const bufferUint32Array = new Uint32Array(bufferArrayBuffer);
    bufferUint32Array[0] = 0;
    buffer.unmap();

    const resultsBufferDescriptor = {size, usage: GPUBufferUsage.STORAGE | GPUBufferUsage.TRANSFER_DST | GPUBufferUsage.MAP_READ};
    const resultsBuffer = device.createBuffer(resultsBufferDescriptor);

    const bufferBinding = {buffer: resultsBuffer, size};
    const bindGroupBinding = {binding: 0, resource: bufferBinding};
    const bindGroupDescriptor = {layout: bindGroupLayout, bindings: [bindGroupBinding]};
    const bindGroup = device.createBindGroup(bindGroupDescriptor);

    const commandEncoder = device.createCommandEncoder(); // {}
    commandEncoder.copyBufferToBuffer(buffer, 0, resultsBuffer, 0, 1 * Uint32Array.BYTES_PER_ELEMENT);
    const computePassEncoder = commandEncoder.beginComputePass();
    computePassEncoder.setPipeline(computePipeline);
    computePassEncoder.setBindGroup(0, bindGroup);
    computePassEncoder.dispatch(1, 1, 1);
    computePassEncoder.endPass();
    const commandBuffer = commandEncoder.finish();
    device.getQueue().submit([commandBuffer]);

    const resultsArrayBuffer = await resultsBuffer.mapReadAsync();
    resultUint32Array = new Uint32Array(resultsArrayBuffer);
    shouldBe("resultUint32Array[0]", "1337");
    resultsBuffer.unmap();
}
if (window.testRunner)
    testRunner.waitUntilDone();
window.addEventListener("load", function() {
    start().then(function() {
        if (window.testRunner)
            testRunner.notifyDone();
    }, function() {
        if (window.testRunner)
            testRunner.notifyDone();
    });
});
</script>
<script src="../resources/js-test-post.js"></script>
</body>
</html>