纯 Alpha 纹理格式，8 位整数。
此格式仅存储 Alpha 通道，不保存任何颜色数据。自定义着色器可以使用它独立于其他通道来计算 Alpha。以与其他纹理相同的方式设置此纹理数据，例如使用 Texture2D.SetPixels，但仅使用 Color 中的 Alpha 分量。
另请参阅：Texture2D、texture assets。
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