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十七种模拟器源代码 非常有用的作课程设计不可缺少的

    jmp %5
%%flipxfull
    mov ebx,[ecx+4]
    bswap ebx
    add ebx,edx
    mov [edi],ebx
    mov ebx,[ecx]
    bswap ebx
    add ebx,edx
    mov [edi+4],ebx
    jmp %5
%%flipyfull
    add ecx,[flipyposng]
    test word[vrama+eax],4000h
    jnz near %%flipxyfull
    mov ebx,[ecx]
    add ebx,edx
    mov [edi],ebx
    mov ebx,[ecx+4]
    add ebx,edx
    mov [edi+4],ebx
    jmp %5
%%flipxyfull
    mov ebx,[ecx+4]
    bswap ebx
    add ebx,edx
    mov [edi],ebx
    mov ebx,[ecx]
    bswap ebx
    add ebx,edx
    mov [edi+4],ebx
    jmp %5
%%parttile
    %2
    ; start drawing from ecx to edi
    test word[vrama+eax],8000h
    jnz near %%flipypart
    add ecx,[yposng]
    test word[vrama+eax],4000h
    jnz near %%flipxpart
    mov ebx,[ecx]
    or ebx,ebx
    jz %%drawd
    add ebx,edx
    test bl,%8
    jz %%drawa
    mov [edi],bl
%%drawa
    test bh,%8
    jz %%drawb
    mov [edi+1],bh
%%drawb
    shr ebx,16
    test bl,%8
    jz %%drawc
    mov [edi+2],bl
%%drawc
    test bh,%8
    jz %%drawd
    mov [edi+3],bh
%%drawd
    mov ebx,[ecx+4]
    or ebx,ebx
    jz %%drawd2
    add ebx,edx
    test bl,%8
    jz %%drawa2
    mov [edi+4],bl
%%drawa2
    test bh,%8
    jz %%drawb2
    mov [edi+5],bh
%%drawb2
    shr ebx,16
    test bl,%8
    jz %%drawc2
    mov [edi+6],bl
%%drawc2
    test bh,%8
    jz %%drawd2
    mov [edi+7],bh
%%drawd2
    jmp %5

%%flipxpart
    mov ebx,[ecx]
    or ebx,ebx
    jz %%drawdf
    add ebx,edx
    test bl,%8
    jz %%drawaf
    mov [edi+7],bl
%%drawaf
    test bh,%8
    jz %%drawbf
    mov [edi+6],bh
%%drawbf
    shr ebx,16
    test bl,%8
    jz %%drawcf
    mov [edi+5],bl
%%drawcf
    test bh,%8
    jz %%drawdf
    mov [edi+4],bh
%%drawdf
    mov ebx,[ecx+4]
    or ebx,ebx
    jz %%drawd2f
    add ebx,edx
    test bl,%8
    jz %%drawa2f
    mov [edi+3],bl
%%drawa2f
    test bh,%8
    jz %%drawb2f
    mov [edi+2],bh
%%drawb2f
    shr ebx,16
    test bl,%8
    jz %%drawc2f
    mov [edi+1],bl
%%drawc2f
    test bh,%8
    jz %%drawd2f
    mov [edi],bh
%%drawd2f
    jmp %5

%%flipypart
    add ecx,[flipyposng]
    test word[vrama+eax],4000h
    jnz near %%flipxypart
    mov ebx,[ecx]
    or ebx,ebx
    jz %%drawdm
    add ebx,edx
    test bl,%8
    jz %%drawam
    mov [edi],bl
%%drawam
    test bh,%8
    jz %%drawbm
    mov [edi+1],bh
%%drawbm
    shr ebx,16
    test bl,%8
    jz %%drawcm
    mov [edi+2],bl
%%drawcm
    test bh,%8
    jz %%drawdm
    mov [edi+3],bh
%%drawdm
    mov ebx,[ecx+4]
    or ebx,ebx
    jz %%drawd2m
    add ebx,edx
    test bl,%8
    jz %%drawa2m
    mov [edi+4],bl
%%drawa2m
    test bh,%8
    jz %%drawb2m
    mov [edi+5],bh
%%drawb2m
    shr ebx,16
    test bl,%8
    jz %%drawc2m
    mov [edi+6],bl
%%drawc2m
    test bh,%8
    jz %%drawd2m
    mov [edi+7],bh
%%drawd2m
    jmp %5

%%flipxypart
    mov ebx,[ecx]
    or ebx,ebx
    jz %%drawdfm
    add ebx,edx
    test bl,%8
    jz %%drawafm
    mov [edi+7],bl
%%drawafm
    test bh,%8
    jz %%drawbfm
    mov [edi+6],bh
%%drawbfm
    shr ebx,16
    test bl,%8
    jz %%drawcfm
    mov [edi+5],bl
%%drawcfm
    test bh,%8
    jz %%drawdfm
    mov [edi+4],bh
%%drawdfm
    mov ebx,[ecx+4]
    or ebx,ebx
    jz %%drawd2fm
    add ebx,edx
    test bl,%8
    jz %%drawa2fm
    mov [edi+3],bl
%%drawa2fm
    test bh,%8
    jz %%drawb2fm
    mov [edi+2],bh
%%drawb2fm
    shr ebx,16
    test bl,%8
    jz %%drawc2fm
    mov [edi+1],bl
%%drawc2fm
    test bh,%8
    jz %%drawd2fm
    mov [edi],bh
%%drawd2fm
%5
    mov ebx,[ng16bbgval]
    add ax,2
    inc dword[bg1totng+ebx*4]
    add edi,8
    test eax,03Fh
    jz %%tileadd
%%next
    dec byte[tleftn]
    jnz near %4
    pop ebx
    cmp byte[curmosaicsz],1
    jne near domosaicng
    ret
%%docache
    call %3
    jmp %%returnfromcache
%%tileadd
    add ax,[bgtxadd]
    jmp %%next
%endmacro

%macro drawlineng16x16 8
    ; tile value : bit 15 = flipy, bit 14 = flipx, bit 13 = priority value
    ;              bit 10-12 = palette, 0-9=tile#
    mov ebx,[ng16bbgval]
    mov dl,ch
    inc dword[bg1drwng+ebx*4]
    and ecx,3FFh
    and edx,1Fh
    add ecx,[ngptrdat2]
    add cx,[taddnfy16x16]
    test dword[vrama+eax],8000h
    jz %%noflipy
    add cx,[taddfy16x16]
%%noflipy
    test dword[vrama+eax],4000h
    jz %%noflipx
    inc cx
%%noflipx
%%nexttile
    push ecx
    push edx
    mov edx,[%6+edx*4]
    %7
    jnz near %%docache
%%returnfromcache
    cmp byte[%1+ecx],2
    je near %%done
    cmp byte[%1+ecx],0
    je near %%parttile
    %2
    ; start drawing from ecx
    test dword[vrama+eax],8000h
    jnz near %%flipyfull
    add ecx,[yposng]
    test dword[vrama+eax],4000h
    jnz near %%flipxfull
    mov ebx,[ecx]
    add ebx,edx
    mov [edi],ebx
    mov ebx,[ecx+4]
    add ebx,edx
    mov [edi+4],ebx
    jmp %%done
%%flipxfull
    mov ebx,[ecx+4]
    bswap ebx
    add ebx,edx
    mov [edi],ebx
    mov ebx,[ecx]
    bswap ebx
    add ebx,edx
    mov [edi+4],ebx
    jmp %%done
%%flipyfull
    add ecx,[flipyposng]
    test word[vrama+eax],4000h
    jnz near %%flipxyfull
    mov ebx,[ecx]
    add ebx,edx
    mov [edi],ebx
    mov ebx,[ecx+4]
    add ebx,edx
    mov [edi+4],ebx
    jmp %%done
%%flipxyfull
    mov ebx,[ecx+4]
    bswap ebx
    add ebx,edx
    mov [edi],ebx
    mov ebx,[ecx]
    bswap ebx
    add ebx,edx
    mov [edi+4],ebx
    jmp %%done
%%parttile
    %2
    ; start drawing from ecx to edi
    test word[vrama+eax],8000h
    jnz near %%flipypart
    add ecx,[yposng]
    test word[vrama+eax],4000h
    jnz near %%flipxpart
    mov ebx,[ecx]
    or ebx,ebx
    jz %%drawd
    add ebx,edx
    test bl,%8
    jz %%drawa
    mov [edi],bl
%%drawa
    test bh,%8
    jz %%drawb
    mov [edi+1],bh
%%drawb
    shr ebx,16
    test bl,%8
    jz %%drawc
    mov [edi+2],bl
%%drawc
    test bh,%8
    jz %%drawd
    mov [edi+3],bh
%%drawd
    mov ebx,[ecx+4]
    or ebx,ebx
    jz %%drawd2
    add ebx,edx
    test bl,%8
    jz %%drawa2
    mov [edi+4],bl
%%drawa2
    test bh,%8
    jz %%drawb2
    mov [edi+5],bh
%%drawb2
    shr ebx,16
    test bl,%8
    jz %%drawc2
    mov [edi+6],bl
%%drawc2
    test bh,%8
    jz %%drawd2
    mov [edi+7],bh
%%drawd2
    jmp %%done

%%flipxpart
    mov ebx,[ecx]
    or ebx,ebx
    jz %%drawdf
    add ebx,edx
    test bl,%8
    jz %%drawaf
    mov [edi+7],bl
%%drawaf
    test bh,%8
    jz %%drawbf
    mov [edi+6],bh
%%drawbf
    shr ebx,16
    test bl,%8
    jz %%drawcf
    mov [edi+5],bl
%%drawcf
    test bh,%8
    jz %%drawdf
    mov [edi+4],bh
%%drawdf
    mov ebx,[ecx+4]
    or ebx,ebx
    jz %%drawd2f
    add ebx,edx
    test bl,%8
    jz %%drawa2f
    mov [edi+3],bl
%%drawa2f
    test bh,%8
    jz %%drawb2f
    mov [edi+2],bh
%%drawb2f
    shr ebx,16
    test bl,%8
    jz %%drawc2f
    mov [edi+1],bl
%%drawc2f
    test bh,%8
    jz %%drawd2f
    mov [edi],bh
%%drawd2f
    jmp %%done

%%flipypart
    add ecx,[flipyposng]
    test word[vrama+eax],4000h
    jnz near %%flipxypart
    mov ebx,[ecx]
    or ebx,ebx
    jz %%drawdm
    add ebx,edx
    test bl,%8
    jz %%drawam
    mov [edi],bl
%%drawam
    test bh,%8
    jz %%drawbm
    mov [edi+1],bh
%%drawbm
    shr ebx,16
    test bl,%8
    jz %%drawcm
    mov [edi+2],bl
%%drawcm
    test bh,%8
    jz %%drawdm
    mov [edi+3],bh
%%drawdm
    mov ebx,[ecx+4]
    or ebx,ebx
    jz %%drawd2m
    add ebx,edx
    test bl,%8
    jz %%drawa2m
    mov [edi+4],bl
%%drawa2m
    test bh,%8
    jz %%drawb2m
    mov [edi+5],bh
%%drawb2m
    shr ebx,16
    test bl,%8
    jz %%drawc2m
    mov [edi+6],bl
%%drawc2m
    test bh,%8
    jz %%drawd2m
    mov [edi+7],bh
%%drawd2m
    jmp %%done

%%flipxypart
    mov ebx,[ecx]
    or ebx,ebx
    jz %%drawdfm
    add ebx,edx
    test bl,%8
    jz %%drawafm
    mov [edi+7],bl
%%drawafm
    test bh,%8
    jz %%drawbfm
    mov [edi+6],bh
%%drawbfm
    shr ebx,16
    test bl,%8
    jz %%drawcfm
    mov [edi+5],bl
%%drawcfm
    test bh,%8
    jz %%drawdfm
    mov [edi+4],bh
%%drawdfm
    mov ebx,[ecx+4]
    or ebx,ebx
    jz %%drawd2fm
    add ebx,edx
    test bl,%8
    jz %%drawa2fm
    mov [edi+3],bl
%%drawa2fm
    test bh,%8
    jz %%drawb2fm
    mov [edi+2],bh
%%drawb2fm
    shr ebx,16
    test bl,%8
    jz %%drawc2fm
    mov [edi+1],bl
%%drawc2fm
    test bh,%8
    jz %%drawd2fm
    mov [edi],bh
%%drawd2fm
%%done
    pop edx
    pop ecx
    inc cx
    test dword[vrama+eax],4000h
    jz %%noflipxb
    sub cx,2
%%noflipxb
    add edi,8
    xor dword[switch16x16],1
    jnz near %%nexttile
%%ntile
    mov ebx,[ng16bbgval]
    add ax,2
    inc dword[bg1totng+ebx*4]
    test eax,03Fh
    jz %%tileadd
%%next
    dec byte[tleftn]
    jnz near %4
    pop ebx
    cmp byte[curmosaicsz],1
    jne near domosaicng
    ret
%5
    add edi,16
    jmp %%ntile
%%docache
    call %3
    jmp %%returnfromcache
%%tileadd
    add ax,[bgtxadd]
    jmp %%next
%endmacro

%macro drawbglineng 2
    mov dword[ng16bprval],0
    mov dword[ng16bbgval],%1
    cmp byte[bgmode],5
    jb %%nointerl
    test byte[intrlng+ebx],01h
    jz %%nointerl
    add ecx,ebx
    add ecx,[cfieldad]
%%nointerl
    push ebx
    mov byte[curmosaicsz],1
    xor eax,eax
    test byte[mosenng+ebx],1 << %1
    jz %%nomosaic
    mov al,[mosszng+ebx]
    or al,al
    jz %%nomosaic
    inc al
    mov byte[curmosaicsz],al
    mov cl,al
    mov al,bl
    div cl
    mul cl
    mov ebx,eax
    mov [pesimpng],esi
    mov edi,xtravbuf+16
    mov ecx,64
    xor eax,eax
    mov esi,xtravbuf+16
    rep stosd
    or ebx,ebx
    jnz %%nozeroline
    inc ebx
%%nozeroline
    mov ecx,[BG1SYl+ebx*2+%1*512]
    and ecx,0FFFFh
    add ecx,ebx
    jmp %%yesmosaic
%%nomosaic
    cmp byte[BGMA+ebx],5
    jae near .tiles16x8
%%yesmosaic
    cmp byte[t16x161+ebx+%1*256],1
    je near .tiles16x16
    cmp byte[BGMA+ebx],2
    je near .offsetm
;    cmp byte[BGMA+ebx],4
;    je near .offsetm2
    mov eax,[BGPT1+ebx*2+%1*512]
    test ecx,100h
    jz .noyinc
    add eax,[BGPT1Y+ebx*2+%1*512]
.noyinc
    lea ecx,[ecx*8]
    mov edx,ecx
    and ecx,07C0h      ; 1Fh*40h
    and edx,38h
    add eax,ecx
    mov [yposng],edx
    xor edx,38h
    mov ecx,[BG1SXl+ebx*2+%1*512]
    mov [flipyposng],edx
    mov edx,[BGPT1X+ebx*2+%1*512]
    test ecx,100h
    jz .noxinc
    add eax,edx
    neg dx
.noxinc
    mov edi,ecx
    sub dx,64
    and ecx,0F8h
    and eax,0FFFFh
    shr ecx,2
    mov [bgtxadd],edx
    mov [bgtxad+ebx*2+%2*512],dx
    add eax,ecx
    mov ecx,[BGOPT1+ebx*2+%1*512]
    mov edx,[BGMA+ebx]
    and edi,07h
    and edx,07h
    and ecx,0FFFFh
    mov edx,[colormodedef+edx*4+%1]
    neg edi
    cmp dl,2
    jne near .no4bit
    shr ecx,5
    add edi,esi
    mov [ngptrdat+%2*1024+ebx*4],ecx
    mov [ngptrdat2],ecx
    mov [ngceax+%2*1024+ebx*4],eax
    mov [ngcedi+%2*1024+ebx*4],edi