Engine API Reference - v2.7.3
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    Variable PIXELFORMAT_DXT5Const

    PIXELFORMAT_DXT5: 10

    Block compressed format storing 16 input pixels into 128 bits of output, consisting of 64 bits of alpha channel data (two 8 bit alpha values and a 4x4 3 bit lookup table) followed by 64 bits of color data (encoded the same way as DXT1).