makev16b.asm

linux下的任天堂模拟器代码。供大家参考。

    dec cl
    jz .doneloop
    dec dl
    jnz .zeroloop
    mov ax,[esi]
    mov dl,dh
    test ax,0FFFFh
    jnz .loopm
    jmp .zeroloop
.doneloop
    ret

NEWSYM dowindow16b
    mov ebx,windowdata
    mov esi,xtravbuf+32
    mov edi,[curvidoffset]
    xor edx,edx
    xor ch,ch
.getnext
    mov cl,[ebx]
    cmp dl,cl
    je .procnext
.dorest
    sub cl,dl
    cmp ch,0
    ja .nodraw
.loopa
    mov ax,[esi+edx*2]
    test ax,0FFFFh
    jz .nocopy
    mov [edi+edx*2],ax
.nocopy
    inc dl
    dec cl
    jnz .loopa
.procnext
    add ch,[ebx+1]
    add ebx,2
    test byte[numwin],0FFh
    jz .finishwin
    dec byte[numwin]
    jnz .getnext
    xor cl,cl
    jmp .dorest
.nodraw
    add dl,cl
    jmp .procnext
.finishwin
    xor eax,eax
    ret

;*******************************************************
; Processes & Draws 8x8 tiles, offset mode
;*******************************************************

NEWSYM draw8x816boffset
    mov [temp],al
    mov [bshifter],ah
    mov eax,esi
    mov [yadder],ecx
    mov [tempcach],ebx
    mov ebx,56
    sub ebx,ecx
    mov [yrevadder],ebx
    initoffsetmode
    ; 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
; tile value : bit 15 = flipy, bit 14 = flipx, bit 13 = priority value
;              bit 10-12 = palette, 0-9=tile#
    cmp byte[curmosaicsz],1
    jne .domosaic
    cmp byte[winon],0
    jne near draw8x816bwinonoffset
.domosaic
    mov byte[tileleft16b],33
    mov byte[drawn],0
    mov dl,[temp]
.loopa
    mov ax,[edi]
    mov dh,ah
    add edi,2
    xor dh,[curbgpr]
    test dh,20h
    jnz near .hprior
    inc byte[drawn]
    and eax,03FFh                ; filter out tile #
    offsetmcachechk
    mov ebx,[tempcach]
    shl eax,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

    ; Begin Normal Loop
    mov cl,[bshifter]
    and dh,1Ch
    shl dh,cl                    ; process palette # (bits 10-12)
    add dh,[bgcoloradder]
    xor eax,eax
    ; Start loop
    cmp dword[ebx],0
    je .loopd4
    Draw8x816bmacro 0
    Draw8x816bmacro 1
    Draw8x816bmacro 2
    Draw8x816bmacro 3
.loopd4
    cmp dword[ebx+4],0
    je .loopd8
    Draw8x816bmacro 4
    Draw8x816bmacro 5
    Draw8x816bmacro 6
    Draw8x816bmacro 7
.loopd8
.hprior
    procoffsetmode
    add esi,16
    dec byte[tileleft16b]
    jnz near .loopa
    xor eax,eax
    cmp byte[drawn],0
    je .nodraw
    mov dh,[curmosaicsz]
    cmp dh,1
    jne near domosaic16b
.nodraw
    ret

    ; reversed loop
.rloop
    mov cl,[bshifter]
    and dh,1Ch
    shl dh,cl                    ; process palette # (bits 10-12)
    add dh,[bgcoloradder]
    xor eax,eax
    cmp dword[ebx+4],0
    je .loopd4b
    Draw8x816bflipmacro 0
    Draw8x816bflipmacro 1
    Draw8x816bflipmacro 2
    Draw8x816bflipmacro 3
.loopd4b
    cmp dword[ebx],0
    je .loopd8b
    Draw8x816bflipmacro 4
    Draw8x816bflipmacro 5
    Draw8x816bflipmacro 6
    Draw8x816bflipmacro 7
.loopd8b
    procoffsetmode
    add esi,16
    dec byte[tileleft16b]
    jnz near .loopa
    xor eax,eax
    cmp byte[drawn],0
    je .nodraw2
    mov dh,[curmosaicsz]
    cmp dh,1
    jne near domosaic16b
.nodraw2
    ret

NEWSYM draw8x816bwinonoffset
    mov byte[tileleft16b],33
    mov byte[drawn],0
    mov dl,[temp]
    mov ebp,[winptrref]
.loopa
    mov ax,[edi]
    mov dh,ah
    add edi,2
    xor dh,[curbgpr]
    test dh,20h
    jnz near .hprior
    inc byte[drawn]
    and eax,03FFh                ; filter out tile #
    offsetmcachechk
    mov ebx,[tempcach]
    shl eax,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

    ; Begin Normal Loop
    mov cl,[bshifter]
    and dh,1Ch
    shl dh,cl                    ; process palette # (bits 10-12)
    add dh,[bgcoloradder]
    xor eax,eax
    ; Start loop
    cmp dword[ebx],0
    je .loopd4
    Draw8x816bwinmacro 0
    Draw8x816bwinmacro 1
    Draw8x816bwinmacro 2
    Draw8x816bwinmacro 3
.loopd4
    cmp dword[ebx+4],0
    je .loopd8
    Draw8x816bwinmacro 4
    Draw8x816bwinmacro 5
    Draw8x816bwinmacro 6
    Draw8x816bwinmacro 7
.loopd8
.hprior
    procoffsetmode
    add esi,16
    add ebp,8
    dec byte[tileleft16b]
    jnz near .loopa
    xor eax,eax
    ret

    ; reversed loop
.rloop
    mov cl,[bshifter]
    and dh,1Ch
    shl dh,cl                    ; process palette # (bits 10-12)
    add dh,[bgcoloradder]
    xor eax,eax
    cmp dword[ebx+4],0
    je .loopd4b
    Draw8x816bwinflipmacro 0
    Draw8x816bwinflipmacro 1
    Draw8x816bwinflipmacro 2
    Draw8x816bwinflipmacro 3
.loopd4b
    cmp dword[ebx],0
    je .loopd8b
    Draw8x816bwinflipmacro 4
    Draw8x816bwinflipmacro 5
    Draw8x816bwinflipmacro 6
    Draw8x816bwinflipmacro 7
.loopd8b
    procoffsetmode
    add esi,16
    add ebp,8
    dec byte[tileleft16b]
    jnz near .loopa
    xor eax,eax
    ret

NEWSYM draw16x1616b
    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 draw16x1616bwinon
.domosaic
    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

    ; Start loop
    Draw16x1616b 0, 0
    Draw16x1616b 1, 2
    Draw16x1616b 2, 4
    Draw16x1616b 3, 6
    Draw16x1616b 4, 8
    Draw16x1616b 5, 10
    Draw16x1616b 6, 12
    Draw16x1616b 7, 14
.hprior
    add esi,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
    Draw16x1616b 7, 0
    Draw16x1616b 6, 2
    Draw16x1616b 5, 4
    Draw16x1616b 4, 6
    Draw16x1616b 3, 8
    Draw16x1616b 2, 10
    Draw16x1616b 1, 12
    Draw16x1616b 0, 14
.skiploop2b
    add esi,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

SECTION .bss
.yadd      resw 1
.yflipadd  resw 1
SECTION .text

draw16x1616bwinon:
    mov byte[tileleft16b],33
    mov dl,[temp]
    mov ebp,[winptrref]
.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[draw16x1616b.yadd]
    jmp .yesyflip
.noyflip
    add ax,word[draw16x1616b.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

    ; Start loop
    Draw16x1616bwin 0, 0, 0
    Draw16x1616bwin 1, 2, 1
    Draw16x1616bwin 2, 4, 2
    Draw16x1616bwin 3, 6, 3
    Draw16x1616bwin 4, 8, 4
    Draw16x1616bwin 5, 10, 5
    Draw16x1616bwin 6, 12, 6
    Draw16x1616bwin 7, 14, 7
.hprior
    add esi,16
    add ebp,8
    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
    Draw16x1616bwin 7, 0, 0
    Draw16x1616bwin 6, 2, 1
    Draw16x1616bwin 5, 4, 2
    Draw16x1616bwin 4, 6, 3
    Draw16x1616bwin 3, 8, 4
    Draw16x1616bwin 2, 10, 5
    Draw16x1616bwin 1, 12, 6
    Draw16x1616bwin 0, 14, 7
.skiploop2b
    add esi,16
    add ebp,8
    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