Function setVertexAndIndexBuffers

Calls passEncoder.setVertexBuffer and optionally passEncoder.setIndexBuffer for the buffers specified in buffersAndAttributes.

This is extremely simple function. It is equivalent to

buffersAndAttributes.buffers.forEach((buffer, i) => {
  passEncoder.setVertexBuffer(firstVertexBufferIndex + i, buffer);
});

if (buffersAndAttributes.indexBuffer) {
  passEncoder.setIndexBuffer(buffersAndAttributes.indexBuffer, buffersAndAttributes.indexFormat!);
}
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It exists solely for simple cases. If you have a complex case, call the passEncoder yourself as appropriate.