mv16tms.asm

linux下的任天堂模拟器代码。供大家参考。

    mov edi,[temptile]
.loopc
    dec byte[tileleft16b]
    jnz near .loopa
    ret

;*******************************************************
; Processes & Draws 16x16 tiles in 2, 4, & 8 bit mode
;*******************************************************
NEWSYM draw16x1616tms
    mov byte[drawn],0
    mov [temp],eax
    mov eax,esi
    mov [yadder],ecx
    mov [tempcach],ebx
    mov ebx,56
    sub ebx,ecx
    mov [yrevadder],ebx
    xor ebx,ebx
    mov bl,[curypos]
    mov [temptile],edx
    ; set up y adders
    test byte[a16x16yinc],01h
    jz .noincrc
    mov word[yadd],16
    mov word[yflipadd],0
    jmp .yesincrc
.noincrc
    mov word[yadd],0
    mov word[yflipadd],16
.yesincrc
    ; esi = pointer to video buffer
    mov esi,[cwinptr]
    sub esi,eax
    mov [winptrref],esi
    mov esi,[curvidoffset]
    sub esi,eax           ; esi = [vidbuffer] + curypos * 288 + 16 - HOfs
    sub esi,eax
    cmp byte[curmosaicsz],1
    je .nomosaic
    mov esi,xtravbuf+32
    mov ecx,128
.clearnext
    mov dword[esi],0
    add esi,4
    dec ecx
    jnz .clearnext
    mov esi,xtravbuf+32
    sub esi,eax
    sub esi,eax
.nomosaic
    mov [temptile],edx
    push ecx
    mov dword[bgsubby],262144
    mov ecx,[vcache2b]
    add ecx,262144
    mov [bgofwptr],ecx
    cmp dword[tempcach],ecx
    jb .nobit
    mov dword[bgsubby],131072
    mov ecx,[vcache4b]
    add ecx,131072
    mov [bgofwptr],ecx
    cmp dword[tempcach],ecx
    jb .nobit
    mov ecx,[vcache8b]
    add ecx,65536
    mov [bgofwptr],ecx
    mov dword[bgsubby],65536
.nobit
    pop ecx
    cmp byte[curmosaicsz],1
    jne .domosaic
    cmp byte[winon],0
    jne near draw16x1616twinonms
.domosaic
    mov ebp,transpbuf+32
    sub ebp,eax
    sub ebp,eax
    test byte[scaddtype],80h
    jnz near draw16x1616tsms
    test byte[scaddtype],40h
    jz near draw16x16fulladdms
    cmp byte[scrnon+1],0
    je near draw16x16fulladdms
    mov byte[tileleft16b],33
    mov dl,[temp]
.loopa
    mov ax,[edi]
    mov dh,ah
    xor byte[a16x16xinc],1
    test dh,40h
    jnz .noxflip
    test byte[a16x16xinc],01h
    jnz .noincr2
    inc ax
    add edi,2
.noincr2
    jmp .yesxflip
.noxflip
    test byte[a16x16xinc],01h
    jnz .noincr
    add edi,2
    jmp .yesincr
.noincr
    inc ax
.yesincr
.yesxflip
    xor dh,[curbgpr]
    test dh,20h
    jnz near .hprior
    inc byte[drawn]
    test dh,80h
    jnz .noyflip
    add ax,word[yadd]
    jmp .yesyflip
.noyflip
    add ax,word[yflipadd]
.yesyflip
    and ax,03FFh                ; filter out tile #
    mov ebx,[tempcach]
    shl ax,6
    add ebx,eax
    cmp ebx,[bgofwptr]
    jb .noclip
    sub ebx,[bgsubby]
.noclip
    test dh,80h
    jz .normadd
    add ebx,[yrevadder]
    jmp .skipadd
.normadd
    add ebx,[yadder]
.skipadd
    test dh,40h
    jnz near .rloop
    mov cl,[bshifter]
    and dh,1Ch
    shl dh,cl                    ; process palette # (bits 10-12)
    add dh,[bgcoloradder]
    xor eax,eax
    xor ecx,ecx
    ; Start loop
    drawtilegrp draw8x816tams
.hprior
    add esi,16
    add ebp,16
    test byte[a16x16xinc],01h
    jnz .noincrb2
    inc dl
.noincrb2
    cmp dl,20h
    jne .loopc2
    xor dl,dl
    mov edi,[temptile]
.loopc2
    dec byte[tileleft16b]
    jnz near .loopa
    mov dh,[curmosaicsz]
    cmp dh,1
    jne near domosaic16b
    ret

    ; reversed loop
.rloop
    mov cl,[bshifter]
    and dh,1Ch
    shl dh,cl                    ; process palette # (bits 10-12)
    add dh,[bgcoloradder]
    xor eax,eax
    xor ecx,ecx
    ; Start loop
    drawtilegrpf draw8x816tams
.skiploop2b
    add esi,16
    add ebp,16
    test byte[a16x16xinc],01h
    jnz .noincrb
    inc dl
.noincrb
    cmp dl,20h
    jne .loopc
    xor dl,dl
    mov edi,[temptile]
.loopc
    dec byte[tileleft16b]
    jnz near .loopa
    mov dh,[curmosaicsz]
    cmp dh,1
    jne near domosaic16b
    ret

draw16x16fulladdms:
    mov byte[tileleft16b],33
    mov dl,[temp]
.loopa
    mov ax,[edi]
    mov dh,ah
    xor byte[a16x16xinc],1

    test dh,40h
    jnz .noxflip
    test byte[a16x16xinc],01h
    jnz .noincr2
    inc ax
    add edi,2
.noincr2
    jmp .yesxflip
.noxflip
    test byte[a16x16xinc],01h
    jnz .noincr
    add edi,2
    jmp .yesincr
.noincr
    inc ax
.yesincr
.yesxflip
    xor dh,[curbgpr]
    push edi
    test dh,20h
    jnz near .hprior
    inc byte[drawn]

    test dh,80h
    jnz .noyflip
    add ax,word[yadd]
    jmp .yesyflip
.noyflip
    add ax,word[yflipadd]
.yesyflip

    and ax,03FFh                ; filter out tile #
    mov edi,[tempcach]
    shl ax,6
    add edi,eax
    cmp edi,[bgofwptr]
    jb .noclip
    sub edi,[bgsubby]
.noclip
    test dh,80h
    jz .normadd
    add edi,[yrevadder]
    jmp .skipadd
.normadd
    add edi,[yadder]
.skipadd
    test dh,40h
    jnz near .rloop
    mov cl,[bshifter]
    and dh,1Ch
    shl dh,cl                    ; process palette # (bits 10-12)
    add dh,[bgcoloradder]
    xor eax,eax
    xor ecx,ecx
    ; Start loop
    drawtilegrpfull draw8x816tbms
.hprior
    pop edi
    add esi,16
    add ebp,16
    test byte[a16x16xinc],01h
    jnz .noincrb2
    inc dl
.noincrb2
    cmp dl,20h
    jne .loopc2
    xor dl,dl
    mov edi,[temptile]
.loopc2
    dec byte[tileleft16b]
    jnz near .loopa
    mov dh,[curmosaicsz]
    cmp dh,1
    jne near domosaic16b
    ret

    ; reversed loop
.rloop
    mov cl,[bshifter]
    and dh,1Ch
    shl dh,cl                    ; process palette # (bits 10-12)
    add dh,[bgcoloradder]
    xor eax,eax
    xor ecx,ecx
    drawtilegrpfullf draw8x816tbms
    pop edi
    add esi,16
    add ebp,16
    test byte[a16x16xinc],01h
    jnz .noincrb
    inc dl
.noincrb
    cmp dl,20h
    jne .loopc
    xor dl,dl
    mov edi,[temptile]
.loopc
    dec byte[tileleft16b]
    jnz near .loopa
    mov dh,[curmosaicsz]
    cmp dh,1
    jne near domosaic16b
    ret

NEWSYM draw16x1616tsms
    mov byte[tileleft16b],33
    mov dl,[temp]
.loopa
    mov ax,[edi]
    mov dh,ah
    xor byte[a16x16xinc],1

    test dh,40h
    jnz .noxflip
    test byte[a16x16xinc],01h
    jnz .noincr2
    inc ax
    add edi,2
.noincr2
    jmp .yesxflip
.noxflip
    test byte[a16x16xinc],01h
    jnz .noincr
    add edi,2
    jmp .yesincr
.noincr
    inc ax
.yesincr
.yesxflip
    xor dh,[curbgpr]
    push edi
    test dh,20h
    jnz near .hprior
    inc byte[drawn]

    test dh,80h
    jnz .noyflip
    add ax,word[yadd]
    jmp .yesyflip
.noyflip
    add ax,word[yflipadd]
.yesyflip

    and ax,03FFh                ; filter out tile #
    mov edi,[tempcach]
    shl ax,6
    add edi,eax
    cmp edi,[bgofwptr]
    jb .noclip
    sub edi,[bgsubby]
.noclip
    test dh,80h
    jz .normadd
    add edi,[yrevadder]
    jmp .skipadd
.normadd
    add edi,[yadder]
.skipadd
    test dh,40h
    jnz near .rloop
    mov cl,[bshifter]
    and dh,1Ch
    shl dh,cl                    ; process palette # (bits 10-12)
    add dh,[bgcoloradder]
    xor eax,eax
    xor ecx,ecx
    ; Start loop
    drawtilegrpfull draw8x816tcms
.hprior
    pop edi
    add esi,16
    add ebp,16
    test byte[a16x16xinc],01h
    jnz .noincrb2
    inc dl
.noincrb2
    cmp dl,20h
    jne .loopc2
    xor dl,dl
    mov edi,[temptile]
.loopc2
    dec byte[tileleft16b]
    jnz near .loopa
    mov dh,[curmosaicsz]
    cmp dh,1
    jne near domosaic16b
    ret

    ; reversed loop
.rloop
    mov cl,[bshifter]
    and dh,1Ch
    shl dh,cl                    ; process palette # (bits 10-12)
    add dh,[bgcoloradder]
    xor eax,eax
    xor ecx,ecx
    drawtilegrpfullf draw8x816tcms
    pop edi
    add esi,16
    add ebp,16
    test byte[a16x16xinc],01h
    jnz .noincrb
    inc dl
.noincrb
    cmp dl,20h
    jne .loopc
    xor dl,dl
    mov edi,[temptile]
.loopc
    dec byte[tileleft16b]
    jnz near .loopa
    mov dh,[curmosaicsz]
    cmp dh,1
    jne near domosaic16b
    ret

NEWSYM draw16x1616twinonms
    mov ebp,transpbuf+32
    sub ebp,eax
    sub ebp,eax
    test byte[scaddtype],80h
    jnz near draw16x1616tswinonms
    test byte[scaddtype],40h
    jz near draw16x16fulladdwinonms
    cmp byte[scrnon+1],0
    je near draw16x16fulladdwinonms
    mov byte[tileleft16b],33
    mov edx,[winptrref]
.loopa
    mov ax,[edi]
    mov cl,ah
    xor byte[a16x16xinc],1
    test cl,40h
    jnz .noxflip
    test byte[a16x16xinc],01h
    jnz .noincr2
    inc ax
    add edi,2
.noincr2
    jmp .yesxflip
.noxflip
    test byte[a16x16xinc],01h
    jnz .noincr
    add edi,2
    jmp .yesincr
.noincr
    inc ax
.yesincr
.yesxflip
    xor cl,[curbgpr]
    test cl,20h
    jnz near .hprior
    inc byte[drawn]
    test cl,80h
    jnz .noyflip
    add ax,word[yadd]
    jmp .yesyflip
.noyflip
    add ax,word[yflipadd]
.yesyflip
    and ax,03FFh                ; filter out tile #
    mov ebx,[tempcach]
    shl ax,6
    add ebx,eax
    cmp ebx,[bgofwptr]
    jb .noclip
    sub ebx,[bgsubby]
.noclip
    test cl,80h
    jz .normadd
    add ebx,[yrevadder]
    jmp .skipadd
.normadd
    add ebx,[yadder]
.skipadd
    test cl,40h
    jnz near .rloop
    mov al,cl
    mov cl,[bshifter]
    and al,1Ch
    shl al,cl                    ; process palette # (bits 10-12)
    add al,[bgcoloradder]
    mov [coadder16],al
    xor eax,eax
    xor ecx,ecx
    ; Start loop
    drawtilegrp draw8x816tawinonms
.hprior
    add esi,16
    add edx,8
    add ebp,16
    test byte[a16x16xinc],01h
    jnz .noincrb2
    inc byte[temp]
.noincrb2
    cmp byte[temp],20h
    jne .loopc2
    mov byte[temp],0
    mov edi,[temptile]
.loopc2
    dec byte[tileleft16b]
    jnz near .loopa
    ret

    ; reversed loop
.rloop
    mov al,cl
    mov cl,[bshifter]
    and al,1Ch
    shl al,cl                    ; process palette # (bits 10-12)
    add al,[bgcoloradder]
    mov [coadder16],al
    xor eax,eax
    xor ecx,ecx
    ; Start loop
    drawtilegrpf draw8x816tawinonbms
.skiploop2b
    add esi,16
    add edx,8
    add ebp,16
    test byte[a16x16xinc],01h
    jnz .noincrb
    inc byte[temp]
.noincrb
    cmp byte[temp],20h
    jne near .loopc2
    mov byte[temp],0
    mov edi,[temptile]
.loopc
    dec byte[tileleft16b]
    jnz near .loopa
    ret

NEWSYM draw16x16fulladdwinonms
    mov byte[tileleft16b],33
    mov edx,[winptrref]
.loopa
    mov ax,[edi]
    mov cl,ah
    xor byte[a16x16xinc],1

    test cl,40h
    jnz .noxflip
    test byte[a16x16xinc],01h
    jnz .noincr2
    inc ax
    add edi,2
.noincr2
    jmp .yesxflip
.noxflip
    test byte[a16x16xinc],01h
    jnz .noincr
    add edi,2
    jmp .yesincr
.noincr
    inc ax
.yesincr
.yesxflip
    xor cl,[curbgpr]
    push edi
    test cl,20h
    jnz near .hprior
    inc byte[drawn]

    test cl,80h
    jnz .noyflip
    add ax,word[yadd]
    jmp .yesyflip
.noyflip
    add ax,word[yflipadd]
.yesyflip

    and ax,03FFh                ; filter out tile #
    mov edi,[tempcach]
    shl ax,6
    add edi,eax
    cmp edi,[bgofwptr]
    jb .noclip
    sub edi,[bgsubby]
.noclip
    test cl,80h
    jz .normadd
    add edi,[yrevadder]
    jmp .skipadd
.normadd
    add edi,[yadder]
.skipadd
    test cl,40h
    jnz near .rloop
    mov al,cl
    mov cl,[bshifter]
    and al,1Ch
    shl al,cl                    ; process palette # (bits 10-12)
    add al,[bgcoloradder]
    mov [coadder16],al
    xor eax,eax
    xor ecx,ecx
    ; Start loop
    drawtilegrpfull draw8x816tbwinonms
.hprior
    pop edi
    add esi,16
    add edx,8
    add ebp,16
    test byte[a16x16xinc],01h
    jnz .noincrb2
    inc byte[temp]
.noincrb2
    cmp byte[temp],20h
    jne .loopc2
    mov byte[temp],0
    mov edi,[temptile]
.loopc2
    dec byte[tileleft16b]
    jnz near .loopa
    ret

    ; reversed loop
.rloop
    mov al,cl
    mov cl,[bshifter]
    and al,1Ch
    shl al,cl                    ; process palette # (bits 10-12)
    add al,[bgcoloradder]
    mov [coadder16],al
    xor eax,eax
    xor ecx,ecx
    drawtilegrpfullf draw8x816tbwinonbms
    pop edi
    add esi,16
    add edx,8
    add ebp,16
    test byte[a16x16xinc],01h
    jnz .noincrb
    inc byte[temp]
.noincrb
    cmp byte[temp],20h
    jne near .loopc2
    mov byte[temp],0
    mov edi,[temptile]
.loopc
    dec byte[tileleft16b]
    jnz near .loopa
    ret

NEWSYM draw16x1616tswinonms
    mov byte[tileleft16b],33
    mov edx,[winptrref]
.loopa
    mov ax,[edi]
    mov cl,ah
    xor byte[a16x16xinc],1

    test cl,40h
    jnz .noxflip
    test byte[a16x16xinc],01h
    jnz .noincr2
    inc ax
    add edi,2
.noincr2
    jmp .yesxflip
.noxflip
    test byte[a16x16xinc],01h
    jnz .noincr
    add edi,2
    jmp .yesincr
.noincr
    inc ax
.yesincr
.yesxflip
    xor cl,[curbgpr]
    push edi
    test cl,20h
    jnz near .hprior
    inc byte[drawn]

    test cl,80h
    jnz .noyflip
    add ax,word[yadd]
    jmp .yesyflip
.noyflip
    add ax,word[yflipadd]
.yesyflip

    and ax,03FFh                ; filter out tile #
    mov edi,[tempcach]
    shl ax,6
    add edi,eax
    cmp edi,[bgofwptr]
    jb .noclip
    sub edi,[bgsubby]
.noclip
    test cl,80h
    jz .normadd
    add edi,[yrevadder]
    jmp .skipadd
.normadd
    add edi,[yadder]
.skipadd
    test cl,40h
    jnz near .rloop
    mov al,cl
    mov cl,[bshifter]
    and al,1Ch
    shl al,cl                    ; process palette # (bits 10-12)
    add al,[bgcoloradder]
    mov [coadder16],al
    xor eax,eax
    xor ecx,ecx
    ; Start loop
    drawtilegrpfull draw8x816tcwinonms
.hprior
    pop edi
    add esi,16
    add edx,8
    add ebp,16
    test byte[a16x16xinc],01h
    jnz .noincrb2
    inc byte[temp]
.noincrb2
    cmp byte[temp],20h
    jne .loopc2
    mov byte[temp],0
    mov edi,[temptile]
.loopc2
    dec byte[tileleft16b]
    jnz near .loopa
    ret

    ; reversed loop
.rloop
    mov al,cl
    mov cl,[bshifter]
    and al,1Ch
    shl al,cl                    ; process palette # (bits 10-12)
    add al,[bgcoloradder]
    mov [coadder16],al
    xor eax,eax
    xor ecx,ecx
    drawtilegrpfullf draw8x816tcwinonbms
    pop edi
    add esi,16
    add edx,8
    add ebp,16
    test byte[a16x16xinc],01h
    jnz .noincrb
    inc byte[temp]
.noincrb
    cmp byte[temp],20h
    jne near .loopc2
    mov byte[temp],0
    mov edi,[temptile]
.loopc
    dec byte[tileleft16b]
    jnz near .loopa
    ret