已打包精灵之间的额外填充量。
表示为 2 的幂数减 1(即 Padding Power 为 0 时,强制精灵之间的间隙为 2 像素;Padding Power 为 1 时,精灵之间的间隙为 4 像素;Padding Power 为 2 时,强制精灵之间的间隙为 8 像素)。这可用于防止精灵在较低的 MIP 级别相互渗透。
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