<!DOCTYPE html>
<html>
<head>
<script src="../js/webgpu-functions.js"></script>
<script src="../../resources/js-test-pre.js"></script>
</head>
<body>
<script>
const shaderSource = `
[numthreads(1, 1, 1)]
compute void computeShader(device float[] buffer : register(u0, space1)) {
    buffer[0] = 17;
}
`;

async function start(device) {
    const shaderModule = device.createShaderModule({code: shaderSource});
    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, bindGroupLayout]};
    const pipelineLayout = device.createPipelineLayout(pipelineLayoutDescriptor);

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

    const size = Float32Array.BYTES_PER_ELEMENT * 1;

    const buffer1 = device.createBuffer({size, usage: GPUBufferUsage.STORAGE | GPUBufferUsage.MAP_READ});
    const buffer2 = device.createBuffer({size, usage: GPUBufferUsage.STORAGE | GPUBufferUsage.MAP_READ});

    const bindGroup1 = device.createBindGroup({layout: bindGroupLayout, bindings: [{binding: 0, resource: {buffer: buffer1, size}}]});
    const bindGroup2 = device.createBindGroup({layout: bindGroupLayout, bindings: [{binding: 0, resource: {buffer: buffer2, size}}]});

    const commandEncoder = device.createCommandEncoder(); // {}
    const computePassEncoder = commandEncoder.beginComputePass();
    computePassEncoder.setPipeline(computePipeline);
    computePassEncoder.setBindGroup(0, bindGroup1);
    computePassEncoder.setBindGroup(1, bindGroup2);
    computePassEncoder.dispatch(1, 1, 1);
    computePassEncoder.endPass();
    const commandBuffer = commandEncoder.finish();
    device.getQueue().submit([commandBuffer]);

    const resultsArrayBuffer = await buffer2.mapReadAsync();
    const resultsFloat32Array = new Float32Array(resultsArrayBuffer);
    if (resultsFloat32Array[0] == 17)
        testPassed("");
    else
        testFailed("");
    buffer2.unmap();
}

window.jsTestIsAsync = true;
getBasicDevice().then(function(device) {
    start(device).then(function() {
        finishJSTest();
    }, function() {
        testFailed("");
        finishJSTest();
    });
}, function() {
    testPassed("");
    finishJSTest();
});
</script>
<script src="../../resources/js-test-post.js"></script>
</body>
</html>