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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/GPUComputePassEncoder/setPipeline below:

GPUComputePassEncoder: setPipeline() method - Web APIs

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The setPipeline() method of the GPUComputePassEncoder interface sets the GPUComputePipeline to use for this compute pass.

pipeline

The GPUComputePipeline to use for this compute pass.

None (Undefined).

In our basic compute demo, several commands are recorded via a GPUCommandEncoder. Most of these commands originate from the GPUComputePassEncoder created via beginComputePass(). The setPipeline() call is used as appropriate to set the pipeline to use for this pass.

const BUFFER_SIZE = 1000;

// …

// Create GPUCommandEncoder to encode commands to issue to the GPU
const commandEncoder = device.createCommandEncoder();

// Initiate render pass
const passEncoder = commandEncoder.beginComputePass();

// Issue commands
passEncoder.setPipeline(computePipeline);
passEncoder.setBindGroup(0, bindGroup);
passEncoder.dispatchWorkgroups(Math.ceil(BUFFER_SIZE / 64));

// End the render pass
passEncoder.end();

// Copy output buffer to staging buffer
commandEncoder.copyBufferToBuffer(
  output,
  0, // Source offset
  stagingBuffer,
  0, // Destination offset
  BUFFER_SIZE,
);

// End frame by passing array of command buffers to command queue for execution
device.queue.submit([commandEncoder.finish()]);

// …

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