DeviceFeatures

• has(feature) returns whether the backend exposes that capability.
• keys() enumerates every feature name available on this device.
• Typical flags include 'texture-compression-bc' and 'timer-query'.

function requireFeatures(device, required) {
  const missing = required.filter(function (feature) {
    return !device.features.has(feature);
  });

  if (missing.length) {
    console.warn('缺少设备特性', missing);
    return false;
  }

  return true;
}

/* 需要的特性名从配置或常量表里读，不在这里硬编码 */
const ok = requireFeatures(device, config.requiredFeatures);

const list = [];

for (const feature of device.features) {
  list.push(feature);
}

console.log(list.length, list);

• The same call can be supported on WebGPU but missing on the WebGL fallback.
• Assuming a feature from browser support instead of device.features breaks fallback paths.