mode716.mac

十七种模拟器源代码 非常有用的作课程设计不可缺少的

;**********************************************************

%%norep2
    test byte[mode7set],40h
    jnz %%tilerep2
    jmp %%nextvalb2
    ALIGN16
%%nextvalb2
    cmp byte[mmode7ypos+2],3
    ja %%offscr2
    cmp byte[mmode7xpos+2],3
    jbe near %%offscr3
%%offscr2
    mov eax,[mmode7xadder]
    mov ebx,[mmode7yadder]
    add [mmode7xpos],eax
    sub [mmode7ypos],ebx
    add esi,%3
    dec dword[mtemp]
    jnz near %%nextvalb2
    jmp %%finishmode7
%%tilerep2
%%nextvalb3
    cmp byte[mmode7ypos+2],3
    ja %%offscr2b
    cmp byte[mmode7xpos+2],3
    jbe near %%offscr3
%%offscr2b
    mov ch,[mmode7xpos+1]
    mov eax,[mmode7xadder]
    mov cl,[mmode7ypos+1]
    mov ebx,[mmode7yadder]
    mov dl,[mode7tab+ecx]
    add [mmode7xpos],eax
    mov dl,[vrama+edx]
    sub [mmode7ypos],ebx
    %1
    dec dword[mtemp]
    jnz near %%nextvalb3
    jmp %%finishmode7
%%offscr3
    mov eax,[mmode7xpos]
    and eax,7FFh
    mov [mmode7xrpos],eax
    mov eax,[mmode7ypos]
    and eax,7FFh
    mov [mmode7yrpos],eax

    ; get tile data offset into edi
    mov ebx,[mmode7ypos+1]
    mov eax,[mmode7xpos+1]
    shl ebx,5
    shr eax,3
    and ebx,07FF8h
    shl al,1
    mov bl,al
    mov edi,[vram]
    xor ch,ch
    mov [mmode7ptr],ebx
    mov cl,[edi+ebx]
    shl ecx,7
    add edi,ecx

    jmp %%nextvalr
    ALIGN16
%%nodr2
    add esi,%3
    dec dword[mtemp]
    jz near %%fin2
%%nextvalr
    test byte[mmode7xrpos+1],08h
    jnz near %%rposoffxr
%%nextposxr
    test byte[mmode7yrpos+1],08h
    jnz near %%rposoffyr
%%nextposyr
    mov cl,[mmode7yrpos+1]
    mov ch,[mmode7xrpos+1]
    mov edx,[mmode7xadder]
    add dword[mmode7xrpos],edx
    mov edx,[mmode7yadder]
    sub dword[mmode7yrpos],edx
    xor edx,edx
    mov dl,[mode7tab+ecx]
%%m7yrpa2
    mov dl,[edi+edx]
    %1
    dec dword[mtemp]
    jnz near %%nextvalr
%%fin2
    jmp %%finishmode7
%%rposoffxr
    mov al,[mmode7xinc]
    mov edi,[vram]
    add [mmode7ptr],al
    mov cl,byte[mmode7xincc]
    cmp byte[mmode7ptr],cl
    je %%roff
%%roffxretb
    mov ebx,[mmode7ptr]
    xor ecx,ecx
    mov cl,[edi+ebx]
    mov eax,[mmode7xadd2]
    shl ecx,7
    sub [mmode7xrpos],eax
    add edi,ecx
    jmp %%nextposxr
%%rposoffyr
    mov al,[mmode7yinc]
    mov edi,[vram]
    sub [mmode7ptr+1],al
    js %%roff
%%roffyretb
    mov ebx,[mmode7ptr]
    xor ecx,ecx
    mov cl,[edi+ebx]
    mov eax,[mmode7yadd2]
    shl ecx,7
    add [mmode7yrpos],eax
    add edi,ecx
    jmp %%nextposyr
%%roff
    test byte[mode7set],40h
    jnz %%tilerep3
    jmp %%finishmode7
%%tilerep3
    and byte[mmode7yrpos+1],07h
    and byte[mmode7xrpos+1],07h
    mov cl,[mmode7yrpos+1]
    mov eax,[mmode7xadder]
    mov ch,[mmode7xrpos+1]
    add [mmode7xrpos],eax
    mov dl,[mode7tab+ecx]
    mov eax,[mmode7yadder]
    mov dl,[vrama+edx]
    sub [mmode7yrpos],eax
    %1
    dec dword[mtemp]
    jnz near %%tilerep3
    jmp %%finishmode7
%endmacro

%macro Mode7ProcessB 3
    mov dword[mtemp],256
    test byte[mode7set],80h
    jnz near %%norep2

    mov eax,[mmode7xpos]
    and eax,7FFh
    mov [mmode7xrpos],eax
    mov eax,[mmode7ypos]
    and eax,7FFh
    mov [mmode7yrpos],eax

    ; get tile data offset into edi
    mov ebx,[mmode7ypos+1]
    mov eax,[mmode7xpos+1]
    shl ebx,5
    shr eax,3
    and ebx,07FF8h
    shl al,1
    mov bl,al
    mov edi,[vram]
    xor ch,ch
    mov [mmode7ptr],ebx
    mov cl,[edi+ebx]
    shl ecx,7
    add edi,ecx

    xor dl,dl
    xor ecx,ecx
    mov ebx,[mmode7xadder]
    test ebx,80000000h
    jz %%nexta
    neg ebx
%%nexta
    cmp ebx,0800h
    jl %%skipx
    sub ebx,800h
    add ecx,[mmode7xadd2]
    add dl,[mmode7xinc]
    jmp %%nexta
%%skipx
    mov [mm7xaddof],ecx
    mov [mm7xaddof2],dl

    xor dl,dl
    xor ecx,ecx
    mov ebx,[mmode7yadder]
    test ebx,80000000h
    jz %%nextay
    neg ebx
%%nextay
    cmp ebx,0800h
    jl %%skipy
    sub ebx,800h
    add ecx,[mmode7yadd2]
    add dl,[mmode7yinc]
    jmp %%nextay
%%skipy
    mov [mm7yaddof],ecx
    mov [mm7yaddof2],dl

    xor ecx,ecx

    mov eax,[mmode7xrpos]
    mov ebx,[mmode7ptr]
    jmp %%nextval
    ALIGN16
%%nextval
    test ah,0F8h
    jnz near %%rposoffx
%%nextposx
    test byte[mmode7yrpos+1],0F8h
    jnz near %%rposoffy
%%nextposy
    mov ch,ah
    mov cl,byte[mmode7yrpos+1]
    mov edx,[mmode7yadder]
    sub dword[mmode7yrpos],edx
    xor edx,edx
    mov dl,[mode7tab+ecx]
    add eax,[mmode7xadder]
    mov dl,[edi+edx]
    %1
    dec dword[mtemp]
    jnz near %%nextval
    jmp %%finishmode7

%%rposoffx
    sub eax,[mm7xaddof]
    add bl,[mm7xaddof2]
    test ah,0F8h
    jz %%noaddstuff
    add bl,[mmode7xinc]
    sub eax,[mmode7xadd2]
%%noaddstuff
    xor ecx,ecx
    mov cl,[vrama+ebx]
    shl ecx,7
    lea edi,[ecx+vrama]
    jmp %%nextposx

%%rposoffy
    mov edx,[m7yaddof]
    add dword[mmode7yrpos],edx
    sub bh,[mm7yaddof2]
    test byte[mmode7yrpos+1],0F8h
    jz %%noaddstuff2
    mov edx,[mmode7yadd2]
    sub bh,[mmode7yinc]
    add dword[mmode7yrpos],edx
%%noaddstuff2
    and ebx,07FFFh
    xor ecx,ecx
    mov cl,[vrama+ebx]
    shl ecx,7
    lea edi,[ecx+vrama]
    jmp %%nextposy

%%finishmode7
    xor eax,eax
    mov dh,byte[curmosaicsz]
    cmp dh,1
    jne near %2
    ret

;**********************************************************
; Mode 7, no repetition mode
;**********************************************************

%%norep2
    test byte[mode7set],40h
    jnz %%tilerep2
    jmp %%nextvalb2
    ALIGN16
%%nextvalb2
    cmp byte[mmode7ypos+2],3
    ja %%offscr2
    cmp byte[mmode7xpos+2],3
    jbe near %%offscr3
%%offscr2
    mov eax,[mmode7xadder]
    mov ebx,[mmode7yadder]
    add [mmode7xpos],eax
    sub [mmode7ypos],ebx
    add esi,%3
    dec dword[mtemp]
    jnz near %%nextvalb2
    jmp %%finishmode7
%%tilerep2
%%nextvalb3
    cmp byte[mmode7ypos+2],3
    ja %%offscr2b
    cmp byte[mmode7xpos+2],3
    jbe near %%offscr3
%%offscr2b
    mov ch,[mmode7xpos+1]
    mov eax,[mmode7xadder]
    mov cl,[mmode7ypos+1]
    mov ebx,[mmode7yadder]
    mov dl,[mode7tab+ecx]
    add [mmode7xpos],eax
    mov dl,[vrama+edx]
    sub [mmode7ypos],ebx
    %1
    dec dword[mtemp]
    jnz near %%nextvalb3
    jmp %%finishmode7
%%offscr3
    mov eax,[mmode7xpos]
    and eax,7FFh
    mov [mmode7xrpos],eax
    mov eax,[mmode7ypos]
    and eax,7FFh
    mov [mmode7yrpos],eax

    ; get tile data offset into edi
    mov ebx,[mmode7ypos+1]
    mov eax,[mmode7xpos+1]
    shl ebx,5
    shr eax,3
    and ebx,07FF8h
    shl al,1
    mov bl,al
    mov edi,[vram]
    xor ch,ch
    mov [mmode7ptr],ebx
    mov cl,[edi+ebx]
    shl ecx,7
    add edi,ecx

    jmp %%nextvalr
    ALIGN16
%%nodr2
    add esi,%3
    dec dword[mtemp]
    jz near %%fin2
%%nextvalr
    test byte[mmode7xrpos+1],0F8h
    jnz near %%rposoffxr
%%nextposxr
    test byte[mmode7yrpos+1],0F8h
    jnz near %%rposoffyr
%%nextposyr
    mov cl,[mmode7yrpos+1]
    mov ch,[mmode7xrpos+1]
    mov edx,[mmode7xadder]
    add dword[mmode7xrpos],edx
    mov edx,[mmode7yadder]
    sub dword[mmode7yrpos],edx
    xor edx,edx
    mov dl,[mode7tab+ecx]
    mov dl,[edi+edx]
    %1
    dec dword[mtemp]
    jnz near %%nextvalr
%%fin2
    jmp %%finishmode7
%%rposoffxr
    mov al,[mmode7xinc]
    mov edi,[vram]
    add [mmode7ptr],al
    mov cl,byte[mmode7xincc]
    cmp byte[mmode7ptr],cl
    je %%roff
%%roffxretb
    mov ebx,[mmode7ptr]
    xor ecx,ecx
    mov cl,[edi+ebx]
    mov eax,[mmode7xadd2]
    shl ecx,7
    sub [mmode7xrpos],eax
    add edi,ecx
    jmp %%nextvalr
%%rposoffyr
    mov al,[mmode7yinc]
    mov edi,[vram]
    sub [mmode7ptr+1],al
    js %%roff
%%roffyretb
    mov ebx,[mmode7ptr]
    xor ecx,ecx
    mov cl,[edi+ebx]
    mov eax,[mmode7yadd2]
    shl ecx,7
    add [mmode7yrpos],eax
    add edi,ecx
    jmp %%nextposxr
%%roff
    test byte[mode7set],40h
    jnz %%tilerep3
    jmp %%finishmode7
%%tilerep3
    and byte[mmode7yrpos+1],07h
    and byte[mmode7xrpos+1],07h
    mov cl,[mmode7yrpos+1]
    mov eax,[mmode7xadder]
    mov ch,[mmode7xrpos+1]
    add [mmode7xrpos],eax
    mov dl,[mode7tab+ecx]
    mov eax,[mmode7yadder]
    mov dl,[vrama+edx]
    sub [mmode7yrpos],eax
    %1
    dec dword[mtemp]
    jnz near %%tilerep3
    jmp %%finishmode7
%endmacro

%macro Mode7Processngw16b 3
    mov dword[ngwleftb],256
    mov dword[ngwleft],256
    test byte[mode7set],80h
    jnz near %%norep2

    mov eax,[mmode7xpos]
    and eax,7FFh
    mov [mode7xrpos],eax
    mov eax,[mmode7ypos]
    and eax,7FFh
    mov [mode7yrpos],eax

    ; get tile data offset into edi
    mov ebx,[mmode7ypos+1]
    mov eax,[mmode7xpos+1]
    shl ebx,5
    shr eax,3
    and ebx,07FF8h
    shl al,1
    mov bl,al
    mov edi,[vram]
    xor ch,ch
    mov [mmode7ptr],ebx
    mov cl,[edi+ebx]
    shl ecx,7
    add edi,ecx

    xor dl,dl
    xor ecx,ecx
    mov ebx,[mmode7xadder]
    test ebx,80000000h
    jz %%nexta
    neg ebx
%%nexta
    cmp ebx,0800h
    jl %%skipx
    sub ebx,800h
    add ecx,[mmode7xadd2]
    add dl,[mmode7xinc]
    jmp %%nexta
%%skipx
    mov [mm7xaddof],ecx
    mov [mm7xaddof2],dl
    mov [m7xaddof],ecx
    mov [m7xaddof2],dl

    xor dl,dl
    xor ecx,ecx
    mov ebx,[mmode7yadder]
    test ebx,80000000h
    jz %%nextay
    neg ebx
%%nextay
    cmp ebx,0800h
    jl %%skipy
    sub ebx,800h
    add ecx,[mmode7yadd2]
    add dl,[mmode7yinc]
    jmp %%nextay
%%skipy
    mov [mm7yaddof],ecx
    mov [mm7yaddof2],dl
    mov [m7yaddof],ecx
    mov [m7yaddof2],dl

    xor ecx,ecx

    mov eax,[mode7xrpos]
    mov ebx,[mmode7ptr]

    call ProcessMode7ngwin16b

    cmp dword[ngwleftb],0
    jne near %%nextval
    jmp %%finishmode7
    ALIGN16
%%nextval
    test ah,0F8h
    jnz near %%rposoffx
%%nextposx
    test byte[mode7yrpos+1],0F8h
    jnz near %%rposoffy
%%nextposy
    mov ch,ah
    mov cl,byte[mode7yrpos+1]
    mov edx,[mode7yadder]
    sub dword[mode7yrpos],edx
    xor edx,edx
    mov dl,[mode7tab+ecx]
    add eax,[mode7xadder]
    mov dl,[edi+edx]
    %1
    dec dword[ngwleftb]
    jnz near %%nextval
    mov [mode7xrpos],eax
    cmp dword[ngwleft],0
    je %%notskipvalues
    call ProcessMode7ngwinB16b
    cmp dword[ngwleftb],0
    jne near %%nextval
%%notskipvalues
    jmp %%finishmode7

%%rposoffx
    sub eax,[mm7xaddof]
    add bl,[mm7xaddof2]
    test ah,0F8h
    jz %%noaddstuff
    add bl,[mmode7xinc]
    sub eax,[mmode7xadd2]
%%noaddstuff
    xor ecx,ecx
    mov cl,[vrama+ebx]
    shl ecx,7
    lea edi,[ecx+vrama]
    jmp %%nextposx

%%rposoffy
    mov edx,[mm7yaddof]
    add dword[mode7yrpos],edx
    sub bh,[mm7yaddof2]
    test byte[mode7yrpos+1],0F8h
    jz %%noaddstuff2
    mov edx,[mmode7yadd2]
    sub bh,[mmode7yinc]
    add dword[mode7yrpos],edx
%%noaddstuff2
    and ebx,07FFFh
    xor ecx,ecx
    mov cl,[vrama+ebx]
    shl ecx,7
    lea edi,[ecx+vrama]
    jmp %%nextposy

%%finishmode7
    xor eax,eax
    mov dh,byte[curmosaicsz]
    cmp dh,1
    jne near %2
    ret

;**********************************************************
; Mode 7, no repetition mode
;**********************************************************

%%norep2
    mov byte[switchtorep3],0

;    mov dword[ngcwinptr],ngwintable blahblah
;    mov ebx,dword[ngcwinptr]
;    mov dword[ebx],900
    ;ngwintable
;    jmp %%finishmode7

    call ProcessMode7ngwinC16b
    cmp dword[ngwleftb],0
    jne near %%nextvald
    jmp %%finishmode7
%%nextvald
    mov dword[ngwleft],0

    test byte[mode7set],40h
    jnz near %%tilerep2
    jmp %%nextvalb2
    ALIGN16
%%nextvalb2
    cmp byte[mode7ypos+2],3
    ja %%offscr2
    cmp byte[mode7xpos+2],3
    jbe near %%offscr3
%%offscr2
    mov eax,[mode7xadder]
    mov ebx,[mode7yadder]
    add [mode7xpos],eax
    sub [mode7ypos],ebx
    add esi,%3
    dec dword[ngwleftb]
    jnz near %%nextvalb2

    cmp dword[ngwleft],0
    je %%notskipvalues3b
    call ProcessMode7ngwinD16b
    cmp dword[ngwleftb],0
    jne near %%nextvalb2
%%notskipvalues3b

    jmp %%finishmode7
%%tilerep2
%%nextvalb3
    cmp byte[mode7ypos+2],3
    ja %%offscr2b
    cmp byte[mode7xpos+2],3
    jbe near %%offscr3
%%offscr2b
    mov ch,[mode7xpos+1]
    mov eax,[mode7xadder]
    mov cl,[mode7ypos+1]
    mov ebx,[mode7yadder]
    mov dl,[mode7tab+ecx]
    add [mode7xpos],eax
    mov dl,[vrama+edx]
    sub [mode7ypos],ebx
    %1
    dec dword[ngwleftb]
    jnz near %%nextvalb3

    cmp dword[ngwleft],0
    je %%notskipvalues3
    call ProcessMode7ngwinD16b
    cmp dword[ngwleftb],0
    jne near %%nextvalb3
%%notskipvalues3

    jmp %%finishmode7
%%offscr3
    mov eax,[mode7xpos]
    and eax,7FFh
    mov [mode7xrpos],eax
    mov eax,[mode7ypos]
    and eax,7FFh
    mov [mode7yrpos],eax

    ; get tile data offset into edi
    mov ebx,[mode7ypos+1]
    mov eax,[mode7xpos+1]