GetMipCountForBuildSettings ( int32 InMip0SizeX, int32 InMip0SizeY, int32 InMip0NumSlices, int32 InExistingMipCount, const FTextureBuildSettings& InBui..., int32& OutMip0SizeX, int32& OutMip0SizeY, int32& OutMip0NumSlices )