每个颜色通道中用于交换链缓冲区的位数。（Direct3D 11 和 Direct3D 12 模式）。
位数量还定义 Unity 用于将内容渲染到显示的方法。
当设置为 10 时，Unity 将使用 R10G10B10A2 缓冲区格式、Rec2020 原色和 ST2084 PQ 编码。
当设置为 16 时，Unity 将使用 R16G16B16A16 缓冲区格式、Rec709 原色和线性颜色（无编码）。
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