Mario ETC1 不支持 alpha 通道。 您必须转换为 ETC2，它确实支持 alpha，但开箱即用的本地支持 ETC2 的设备并不多。 ETC1 doesn't support alpha channels. You'll have to convert to ETC2, which does support alpha, but there aren't many devices that support ETC2 natively out of the box.
