Engine API Reference - v2.7.3
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    Variable TEXTURETYPE_SWIZZLEGGGRConst

    TEXTURETYPE_SWIZZLEGGGR: "swizzleGGGR" = 'swizzleGGGR'

    Texture stores normalmap data swizzled in GGGR format. This is used for tangent space normal maps. The R component is stored in alpha and G is stored in RGB. This packing can result in higher quality when the texture data is compressed.