ConstReadonlyCROSS_HORIZONTAL: "cross_horizontal"4x3 horizontal cross.
ReadonlyCROSS_VERTICAL: "cross_vertical"3x4 vertical cross.
ReadonlyGRID_3X2: "grid_3x2"3x2 grid.
ReadonlySIX_IMAGES: "six_images"Six individual images.
ReadonlySTRIP_HORIZONTAL: "strip_horizontal"6x1 horizontal strip.
ReadonlySTRIP_VERTICAL: "strip_vertical"1x6 vertical strip.
Layouts for cube map textures.