if (scale == 1) {
    use normal combiners
} else if (singletexturing) {
    move scaling from TexCombine to ColorCombine
} else if (GL_COMBINE requires Napalm texCombineInvert) {
    fix SUBTRACT
    fix ADD_SIGNED (w/o A_INVERT, B_INVERT)
    fix INTERPOLATE (w/o A_OK, B_INVERT)

    not fixed: ADD_SIGNED (A_INVERT, B_INVERT)
    not fixed: INTERPOLATE (A_OK, B_INVERT)
}
