Sonic 3 in 1 - Calc SEGA logo angle

        ; Calulate scaling for the current angle
        move.b  (Sega_RotAngle).w,d0    ; d0 -> rot angle
        jsr _S1_CalcSine
        move.l  #$8000,d2       ; d2 -> $8000
        asr.w   d1          ; d1 -> Cos/2
        bne.s   @div            ; if Cos/2 != 0 then branch
        moveq   #0,d2           ; d2 -> -1/Cos = 0
        bra.s   @nodiv          ; skip division
    @div:   divs.w  d1,d2           ; d2 -> -1/Cos
        neg.w   d2          ; d2 ->  1/Cos
    @nodiv: move.w  d2,(Sega_VScale).w  ; VScale -> 1/Cos

        asr.w   d0          ; d0 -> Sin/2
        move.w  d0,(Sega_HScale).w  ; HScale -> Sin/2
        bsr.w   Sega_VDeform
        bsr.w   Sega_HDeform