启用或禁用保留覆盖范围的 Alpha mipmap。
启用此选项可以重新缩放计算出的 mipmap 的 Alpha 值，从而保留覆盖范围。这意味着更高的像素百分比通过 Alpha 测试，并且较低 mipmap 级别不会变得更透明。默认情况下禁用此选项（设置为 false）。
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