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https://github.com/cocos-creator/2d-tasks/issues/1132
支持 etc2 需要开启 OpenGLES3,然而 OpenGLES3 开启后会遇到各种兼容问题,详细请参考:cocos2d/cocos2d-x#17478 (comment)
目前没有精力支持,需要支持 etc2 的可以参考此 pr 自行修改。