一个旋转的3D箱子(动画)

;  ; Update Z
    ret
ENDP UpdateAngles

PROC GetSinCos
; Needed : bx=angle (0..255)
; Returns: ax=Sin   bx=Cos
    push    bx                  ; Save angle (use as pointer)
    shl     bx,1                ; Grab a word so bx=bx*2
    mov     ax,[SinCos + bx]    ; Get sine
    pop     bx                  ; Restore pointer into bx
    push    ax                  ; Save sine on stack
    add     bx,64               ; Add 64 to get cosine
    and     bx,11111111b        ; Range from 0..255
    shl     bx,1                ; *2 coz it''s a word
    mov     ax,[SinCos + bx]    ; Get cosine
    mov     bx,ax               ; Save it   bx=Cos
    pop     ax                  ; Restore   ax=Sin
    ret
ENDP GetSinCos

PROC SetRotation
; Set sine & cosine of x,y,z
    mov     bx,[XAngle]         ; Grab angle
    call    GetSinCos           ; Get the sine&cosine
    mov     [Xsin],ax           ; Save sin
    mov     [Xcos],bx           ; Save cos

    mov     bx,[Yangle]
    call    GetSinCos
    mov     [Ysin],ax
    mov     [Ycos],bx

    mov     bx,[Zangle]
    cal