adapters

Every graphics adapter this machine offers, as a list of hash references.

Each carries name, backend ("Vulkan", "Metal", "Dx12", "Gl"), device_type ("DiscreteGpu", "IntegratedGpu", "Cpu", "Other") and driver. A machine commonly has more than one - an integrated chip and a discrete card, or the same card through two different backends:

for my $a (Peta::WebGPU::adapters()) {
    printf "%-14s %-14s %s\n", $a->{backend}, $a->{device_type}, $a->{name};
}

Which one Peta::WebGPU::Device->new picks is decided by its power option, not by this list; the list is for reporting and for deciding whether the machine has the card you need.