;Copyright (C) 1997-2007 ZSNES Team ( zsKnight, _Demo_, pagefault, Nach )
;
;http://www.zsnes.com
;http://sourceforge.net/projects/zsnes
;https://zsnes.bountysource.com
;
;This program is free software; you can redistribute it and/or
;modify it under the terms of the GNU General Public License
;version 2 as published by the Free Software Foundation.
;
;This program is distributed in the hope that it will be useful,
;but WITHOUT ANY WARRANTY; without even the implied warranty of
;MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;GNU General Public License for more details.
;
;You should have received a copy of the GNU General Public License
;along with this program; if not, write to the Free Software
;Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.



SECTION .text

Nextwinmode:
    push ebx
    mov ebx,[ngcwinptr]
    xor dword[ngcwinmode],1
    mov ebx,[ebx+4]
    add dword[ngcwinptr],4
    mov [ngcpixleft],ebx
    pop ebx
    ret

%macro processnextdrawwin 3
    dec dword[ngcpixleft]
    jnz %%notzero
    call Nextwinmode
%%notzero
    cmp dword[ngcwinmode],1
    je %%nodraw
    test %1,%3
    jz %%nodraw
    mov [edi+%2],%1
%%nodraw
%endmacro

%macro processwinpixel 0
    dec dword[ngcpixleft]
    jnz %%notzero
    call Nextwinmode
%%notzero
    dec dword[ngcpixleft]
    jnz %%notzero2
    call Nextwinmode
%%notzero2
%endmacro

%macro drawlinengwin 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]
    mov edx,[%6+edx*4]
    %7
    jnz near %%docache
%%returnfromcache
    %2
    ; start drawing from ecx to edi
    test word[vrama+eax],8000h
    jz %%noflipypart
    add ecx,[flipyposng]
    jmp %%flipypart
%%noflipypart
    add ecx,[yposng]
%%flipypart
    test word[vrama+eax],4000h
    jnz near %%flipxpart
    mov ebx,[ecx]
    add ebx,edx
    processnextdrawwin bl,0,%8
    processnextdrawwin bh,1,%8
    shr ebx,16
    processnextdrawwin bl,2,%8
    processnextdrawwin bh,3,%8
    mov ebx,[ecx+4]
    add ebx,edx
    processnextdrawwin bl,4,%8
    processnextdrawwin bh,5,%8
    shr ebx,16
    processnextdrawwin bl,6,%8
    processnextdrawwin bh,7,%8
    jmp .fin
%%flipxpart
    mov ebx,[ecx+4]
    add ebx,edx
    rol ebx,16
    processnextdrawwin bh,0,%8
    processnextdrawwin bl,1,%8
    shr ebx,16
    processnextdrawwin bh,2,%8
    processnextdrawwin bl,3,%8
    mov ebx,[ecx]
    add ebx,edx
    rol ebx,16
    processnextdrawwin bh,4,%8
    processnextdrawwin bl,5,%8
    shr ebx,16
    processnextdrawwin bh,6,%8
    processnextdrawwin bl,7,%8
    jmp .fin
%5
    processwinpixel
    processwinpixel
    processwinpixel
    processwinpixel
.fin
    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 drawlineng16x16win 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
    %2
    ; start drawing from ecx to edi
    test word[vrama+eax],8000h
    jnz %%flipypart
    add ecx,[yposng]
    jmp %%noflipypart
%%flipypart
    add ecx,[flipyposng]
%%noflipypart
    test word[vrama+eax],4000h
    jnz near %%flipxpart
    mov ebx,[ecx]
    add ebx,edx
    processnextdrawwin bl,0,%8
    processnextdrawwin bh,1,%8
    shr ebx,16
    processnextdrawwin bl,2,%8
    processnextdrawwin bh,3,%8
    mov ebx,[ecx+4]
    add ebx,edx
    processnextdrawwin bl,4,%8
    processnextdrawwin bh,5,%8
    shr ebx,16
    processnextdrawwin bl,6,%8
    processnextdrawwin bh,7,%8
    jmp %%done
%%flipxpart
    mov ebx,[ecx+4]
    add ebx,edx
    rol ebx,16
    processnextdrawwin bh,0,%8
    processnextdrawwin bl,1,%8
    shr ebx,16
    processnextdrawwin bh,2,%8
    processnextdrawwin bl,3,%8
    mov ebx,[ecx]
    add ebx,edx
    rol ebx,16
    processnextdrawwin bh,4,%8
    processnextdrawwin bl,5,%8
    shr ebx,16
    processnextdrawwin bh,6,%8
    processnextdrawwin bl,7,%8
%%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 near %%tileadd
%%next
    dec byte[tleftn]
    jnz near %4
    pop ebx
    cmp byte[curmosaicsz],1
    jne near domosaicng
    ret
%5
    processwinpixel
    processwinpixel
    processwinpixel
    processwinpixel
    processwinpixel
    processwinpixel
    processwinpixel
    processwinpixel
    add edi,16
    jmp %%ntile
%%docache
    call %3
    jmp %%returnfromcache
%%tileadd
    add ax,[bgtxadd]
    jmp %%next
%endmacro

%macro drawlinengomwin 8
    ; tile value : bit 15 = flipy, bit 14 = flipx, bit 13 = priority value
    ;              bit 10-12 = palette, 0-9=tile#
    mov ebx,[cbgval]
    mov dl,ch
    inc dword[bg1drwng+ebx*4]
    and ecx,3FFh
    and edx,1Fh
    add ecx,[ngptrdat2]
    mov edx,[%6+edx*4]
    %7
    jnz near %%docache
%%returnfromcache
    %2
    ; start drawing from ecx to edi
    test word[vrama+eax],8000h
    jnz near %%flipypart
    add ecx,[yposng]
    jmp %%notflipypart
%%flipypart
    add ecx,[flipyposng]
%%notflipypart
    test word[vrama+eax],4000h
    jnz near %%flipxpart
    mov ebx,[ecx]
    add ebx,edx
    processnextdrawwin bl,0,%8
    processnextdrawwin bh,1,%8
    shr ebx,16
    processnextdrawwin bl,2,%8
    processnextdrawwin bh,3,%8
    mov ebx,[ecx+4]
    add ebx,edx
    processnextdrawwin bl,4,%8
    processnextdrawwin bh,5,%8
    shr ebx,16
    processnextdrawwin bl,6,%8
    processnextdrawwin bh,7,%8
    jmp %%endokay

%%flipxpart
    mov ebx,[ecx+4]
    add ebx,edx
    rol ebx,16
    processnextdrawwin bh,0,%8
    processnextdrawwin bl,1,%8
    shr ebx,16
    processnextdrawwin bh,2,%8
    processnextdrawwin bl,3,%8
    mov ebx,[ecx]
    add ebx,edx
    rol ebx,16
    processnextdrawwin bh,4,%8
    processnextdrawwin bl,5,%8
    shr ebx,16
    processnextdrawwin bh,6,%8
    processnextdrawwin bl,7,%8
    jmp %%endokay
%5
    processwinpixel
    processwinpixel
    processwinpixel
    processwinpixel
%%endokay
    mov ebx,[cbgval]
    add word[ofsmmptr],2
    inc dword[bg1totng+ebx*4]
    add word[ofsmtptr],2
    mov ax,[ofsmmptr]
    mov ebx,[yposngom]
    mov edx,[flipyposngom]
    mov [yposng],ebx
    mov [flipyposng],edx
    add edi,8
    test eax,03Fh
    jz near %%tileadd
%%next
    mov ebx,[ofsmcptr]
    add ebx,[ofsmcptr2]
    mov ecx,[ofsmval]
    add dword[ofshvaladd],8
    test dword[ebx],ecx
    jz .noofsm
    mov ebx,[ebx]
    mov ax,[ofsmtptr]
    and ebx,3FFh
    add ebx,[ofsmcyps]
    test ebx,100h
    jz .noupper
    add ax,[ofsmady]
.noupper
    and ebx,0FFh
    mov edx,ebx
    shr ebx,3
    and edx,07h
    shl ebx,6
    shl edx,3
    add ax,bx
    mov [yposng],edx
    xor edx,38h
    mov [flipyposng],edx
.noofsm
    mov ebx,[ofsmcptr]
    add ebx,[ofsmcptr2]
    add dword[ofsmcptr2],2
    mov ecx,[ofsmval]
    and dword[ofsmcptr2],3Fh
    test dword[ebx-40h],ecx
    jz %%noofsmh
    mov ebx,[ebx-40h]
    sub ax,[ofsmtptr]
    add ax,[ofsmtptrs]
    add ebx,[ofshvaladd]
    test ebx,100h
    jz %%noleft
    add ax,[ofsmadx]
%%noleft
    and ebx,0F8h
    shr ebx,2
    add ax,bx
%%noofsmh
    dec byte[tleftn]
    jnz near %4
%%fin
    pop ebx
    cmp byte[curmosaicsz],1
    jne near domosaicng
    ret
%%docache
    call %3
    jmp %%returnfromcache
%%tileadd
    mov bx,[bgtxadd]
    add ax,bx
    add [ofsmmptr],bx
    add word[ofsmtptr],bx
    jmp %%next
%endmacro

%macro parttilewin 2
    cmp dword[ngcwinmode],1
    je %%nodraw
    mov bl,[ecx+%1*8]
    or bl,bl
    jz %%nodraw
    add bl,dl
    mov [edi+%2*288],bl
%%nodraw
%endmacro

%macro drawtilengwin 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]
    mov edx,[%6+edx*4]
    %7
    jnz near %%docache
%%returnfromcache
    cmp byte[%1+ecx],2
    je near %5
    cmp byte[%1+ecx],0
    je near %%parttile
    %2
    ; start drawing from ecx
    test dword[vrama+eax],8000h
    jnz near %%flipyfull
    test dword[vrama+eax],4000h
    jnz near %%flipxfull
    mov dword[tleftnb],8
%%loopfa
    dec dword[ngcpixleft]
    jnz %%notzero
    call Nextwinmode
%%notzero
    cmp dword[ngcwinmode],1
    je %%nodraw
    mov bl,[ecx]
    add bl,dl
    mov [edi],bl
    mov bl,[ecx+8]
    add bl,dl
    mov [edi+288],bl
    mov bl,[ecx+8*2]
    add bl,dl
    mov [edi+288*2],bl
    mov bl,[ecx+8*3]
    add bl,dl
    mov [edi+288*3],bl
    mov bl,[ecx+8*4]
    add bl,dl
    mov [edi+288*4],bl
    mov bl,[ecx+8*5]
    add bl,dl
    mov [edi+288*5],bl
    mov bl,[ecx+8*6]
    add bl,dl
    mov [edi+288*6],bl
    mov bl,[ecx+8*7]
    add bl,dl
    mov [edi+288*7],bl
%%nodraw
    inc ecx
    inc edi
    dec dword[tleftnb]
    jnz near %%loopfa
    sub edi,8
    jmp %%end
%%flipxfull
    mov dword[tleftnb],8
    add ecx,7
%%loopfb
    dec dword[ngcpixleft]
    jnz %%notzerob
    call Nextwinmode
%%notzerob
    cmp dword[ngcwinmode],1
    je %%nodrawb
    mov bl,[ecx]
    add bl,dl
    mov [edi],bl
    mov bl,[ecx+8]
    add bl,dl
    mov [edi+288],bl
    mov bl,[ecx+8*2]
    add bl,dl
    mov [edi+288*2],bl
    mov bl,[ecx+8*3]
    add bl,dl
    mov [edi+288*3],bl
    mov bl,[ecx+8*4]
    add bl,dl
    mov [edi+288*4],bl
    mov bl,[ecx+8*5]
    add bl,dl
    mov [edi+288*5],bl
    mov bl,[ecx+8*6]
    add bl,dl
    mov [edi+288*6],bl
    mov bl,[ecx+8*7]
    add bl,dl
    mov [edi+288*7],bl
%%nodrawb
    dec ecx
    inc edi
    dec dword[tleftnb]
    jnz near %%loopfb
    sub edi,8
    jmp %%end
%%flipyfull
    test word[vrama+eax],4000h
    jnz near %%flipxyfull
    mov dword[tleftnb],8
%%loopfc
    dec dword[ngcpixleft]
    jnz %%notzeroc
    call Nextwinmode
%%notzeroc
    cmp dword[ngcwinmode],1
    je %%nodrawc
    mov bl,[ecx+8*7]
    add bl,dl
    mov [edi],bl
    mov bl,[ecx+8*6]
    add bl,dl
    mov [edi+288],bl
    mov bl,[ecx+8*5]
    add bl,dl
    mov [edi+288*2],bl
    mov bl,[ecx+8*4]
    add bl,dl
    mov [edi+288*3],bl
    mov bl,[ecx+8*3]
    add bl,dl
    mov [edi+288*4],bl
    mov bl,[ecx+8*2]
    add bl,dl
    mov [edi+288*5],bl
    mov bl,[ecx+8]
    add bl,dl
    mov [edi+288*6],bl
    mov bl,[ecx]
    add bl,dl
    mov [edi+288*7],bl
%%nodrawc
    inc ecx
    inc edi
    dec dword[tleftnb]
    jnz near %%loopfc
    sub edi,8
    jmp %%end
%%flipxyfull
    mov dword[tleftnb],8
    add ecx,7
%%loopfd
    dec dword[ngcpixleft]
    jnz %%notzerod
    call Nextwinmode
%%notzerod
    cmp dword[ngcwinmode],1
    je %%nodrawd
    mov bl,[ecx+8*7]
    add bl,dl
    mov [edi],bl
    mov bl,[ecx+8*6]
    add bl,dl
    mov [edi+288],bl
    mov bl,[ecx+8*5]
    add bl,dl
    mov [edi+288*2],bl
    mov bl,[ecx+8*4]
    add bl,dl
    mov [edi+288*3],bl
    mov bl,[ecx+8*3]
    add bl,dl
    mov [edi+288*4],bl
    mov bl,[ecx+8*2]
    add bl,dl
    mov [edi+288*5],bl
    mov bl,[ecx+8]
    add bl,dl
    mov [edi+288*6],bl
    mov bl,[ecx]
    add bl,dl
    mov [edi+288*7],bl
%%nodrawd
    dec ecx
    inc edi
    dec dword[tleftnb]
    jnz near %%loopfd
    sub edi,8
    jmp %%end
%%parttile
    %2
    ; start drawing from ecx
    test dword[vrama+eax],8000h
    jnz near %%flipyfullp
    test dword[vrama+eax],4000h
    jnz near %%flipxfullp
    mov dword[tleftnb],8
%%loopfap
    dec dword[ngcpixleft]
    jnz %%notzerop
    call Nextwinmode
%%notzerop
    parttilewin 0,0
    parttilewin 1,1
    parttilewin 2,2
    parttilewin 3,3
    parttilewin 4,4
    parttilewin 5,5
    parttilewin 6,6
    parttilewin 7,7
    inc ecx
    inc edi
    dec dword[tleftnb]
    jnz near %%loopfap
    sub edi,8
    jmp %%end
%%flipxfullp
    mov dword[tleftnb],8
    add ecx,7
%%loopfbp
    dec dword[ngcpixleft]
    jnz %%notzerobp
    call Nextwinmode
%%notzerobp
    parttilewin 0,0
    parttilewin 1,1
    parttilewin 2,2
    parttilewin 3,3
    parttilewin 4,4
    parttilewin 5,5
    parttilewin 6,6
    parttilewin 7,7
    dec ecx
    inc edi
    dec dword[tleftnb]
    jnz near %%loopfbp
    sub edi,8
    jmp %%end
%%flipyfullp
    test word[vrama+eax],4000h
    jnz near %%flipxyfullp
    mov dword[tleftnb],8
%%loopfcp
    dec dword[ngcpixleft]
    jnz %%notzerocp
    call Nextwinmode
%%notzerocp
    parttilewin 7,0
    parttilewin 6,1
    parttilewin 5,2
    parttilewin 4,3
    parttilewin 3,4
    parttilewin 2,5
    parttilewin 1,6
    parttilewin 0,7
    inc ecx
    inc edi
    dec dword[tleftnb]
    jnz near %%loopfcp
    sub edi,8
    jmp %%end
%%flipxyfullp
    mov dword[tleftnb],8
    add ecx,7
%%loopfdp
    dec dword[ngcpixleft]
    jnz %%notzerodp
    call Nextwinmode
%%notzerodp
    parttilewin 7,0
    parttilewin 6,1
    parttilewin 5,2
    parttilewin 4,3
    parttilewin 3,4
    parttilewin 2,5
    parttilewin 1,6
    parttilewin 0,7
    dec ecx
    inc edi
    dec dword[tleftnb]
    jnz near %%loopfdp
    sub edi,8
    jmp %%end
%5
    processwinpixel
    processwinpixel
    processwinpixel
    processwinpixel
%%end
    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
    ret
%%docache
    call %3
    jmp %%returnfromcache
%%tileadd
    add ax,[bgtxadd]
    jmp %%next
%endmacro

%macro drawtileng16x16win 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 %%skip
    cmp byte[%1+ecx],0
    je near %%parttile
    %2
    ; start drawing from ecx
    test dword[vrama+eax],8000h
    jnz near %%flipyfull
    test dword[vrama+eax],4000h
    jnz near %%flipxfull
    mov dword[tleftnb],8
%%loopfa
    dec dword[ngcpixleft]
    jnz %%notzero
    call Nextwinmode
%%notzero
    cmp dword[ngcwinmode],1
    je %%nodraw
    mov bl,[ecx]
    add bl,dl
    mov [edi],bl
    mov bl,[ecx+8]
    add bl,dl
    mov [edi+288],bl
    mov bl,[ecx+8*2]
    add bl,dl
    mov [edi+288*2],bl
    mov bl,[ecx+8*3]
    add bl,dl
    mov [edi+288*3],bl
    mov bl,[ecx+8*4]
    add bl,dl
    mov [edi+288*4],bl
    mov bl,[ecx+8*5]
    add bl,dl
    mov [edi+288*5],bl
    mov bl,[ecx+8*6]
    add bl,dl
    mov [edi+288*6],bl
    mov bl,[ecx+8*7]
    add bl,dl
    mov [edi+288*7],bl
%%nodraw
    inc ecx
    inc edi
    dec dword[tleftnb]
    jnz near %%loopfa
    sub edi,8
    jmp %%end
%%flipxfull
    mov dword[tleftnb],8
    add ecx,7
%%loopfb
    dec dword[ngcpixleft]
    jnz %%notzerob
    call Nextwinmode
%%notzerob
    cmp dword[ngcwinmode],1
    je %%nodrawb
    mov bl,[ecx]
    add bl,dl
    mov [edi],bl
    mov bl,[ecx+8]
    add bl,dl
    mov [edi+288],bl
    mov bl,[ecx+8*2]
    add bl,dl
    mov [edi+288*2],bl
    mov bl,[ecx+8*3]
    add bl,dl
    mov [edi+288*3],bl
    mov bl,[ecx+8*4]
    add bl,dl
    mov [edi+288*4],bl
    mov bl,[ecx+8*5]
    add bl,dl
    mov [edi+288*5],bl
    mov bl,[ecx+8*6]
    add bl,dl
    mov [edi+288*6],bl
    mov bl,[ecx+8*7]
    add bl,dl
    mov [edi+288*7],bl
%%nodrawb
    dec ecx
    inc edi
    dec dword[tleftnb]
    jnz near %%loopfb
    sub edi,8
    jmp %%end
%%flipyfull
    test word[vrama+eax],4000h
    jnz near %%flipxyfull
    mov dword[tleftnb],8
%%loopfc
    dec dword[ngcpixleft]
    jnz %%notzeroc
    call Nextwinmode
%%notzeroc
    cmp dword[ngcwinmode],1
    je %%nodrawc
    mov bl,[ecx+8*7]
    add bl,dl
    mov [edi],bl
    mov bl,[ecx+8*6]
    add bl,dl
    mov [edi+288],bl
    mov bl,[ecx+8*5]
    add bl,dl
    mov [edi+288*2],bl
    mov bl,[ecx+8*4]
    add bl,dl
    mov [edi+288*3],bl
    mov bl,[ecx+8*3]
    add bl,dl
    mov [edi+288*4],bl
    mov bl,[ecx+8*2]
    add bl,dl
    mov [edi+288*5],bl
    mov bl,[ecx+8]
    add bl,dl
    mov [edi+288*6],bl
    mov bl,[ecx]
    add bl,dl
    mov [edi+288*7],bl
%%nodrawc
    inc ecx
    inc edi
    dec dword[tleftnb]
    jnz near %%loopfc
    sub edi,8
    jmp %%end
%%flipxyfull
    mov dword[tleftnb],8
    add ecx,7
%%loopfd
    dec dword[ngcpixleft]
    jnz %%notzerod
    call Nextwinmode
%%notzerod
    cmp dword[ngcwinmode],1
    je %%nodrawd
    mov bl,[ecx+8*7]
    add bl,dl
    mov [edi],bl
    mov bl,[ecx+8*6]
    add bl,dl
    mov [edi+288],bl
    mov bl,[ecx+8*5]
    add bl,dl
    mov [edi+288*2],bl
    mov bl,[ecx+8*4]
    add bl,dl
    mov [edi+288*3],bl
    mov bl,[ecx+8*3]
    add bl,dl
    mov [edi+288*4],bl
    mov bl,[ecx+8*2]
    add bl,dl
    mov [edi+288*5],bl
    mov bl,[ecx+8]
    add bl,dl
    mov [edi+288*6],bl
    mov bl,[ecx]
    add bl,dl
    mov [edi+288*7],bl
%%nodrawd
    dec ecx
    inc edi
    dec dword[tleftnb]
    jnz near %%loopfd
    sub edi,8
    jmp %%end
%%parttile
    %2
    ; start drawing from ecx
    test dword[vrama+eax],8000h
    jnz near %%flipyfullp
    test dword[vrama+eax],4000h
    jnz near %%flipxfullp
    mov dword[tleftnb],8
%%loopfap
    dec dword[ngcpixleft]
    jnz %%notzerop
    call Nextwinmode
%%notzerop
    parttilewin 0,0
    parttilewin 1,1
    parttilewin 2,2
    parttilewin 3,3
    parttilewin 4,4
    parttilewin 5,5
    parttilewin 6,6
    parttilewin 7,7
    inc ecx
    inc edi
    dec dword[tleftnb]
    jnz near %%loopfap
    sub edi,8
    jmp %%end
%%flipxfullp
    mov dword[tleftnb],8
    add ecx,7
%%loopfbp
    dec dword[ngcpixleft]
    jnz %%notzerobp
    call Nextwinmode
%%notzerobp
    parttilewin 0,0
    parttilewin 1,1
    parttilewin 2,2
    parttilewin 3,3
    parttilewin 4,4
    parttilewin 5,5
    parttilewin 6,6
    parttilewin 7,7
    dec ecx
    inc edi
    dec dword[tleftnb]
    jnz near %%loopfbp
    sub edi,8
    jmp %%end
%%flipyfullp
    test word[vrama+eax],4000h
    jnz near %%flipxyfullp
    mov dword[tleftnb],8
%%loopfcp
    dec dword[ngcpixleft]
    jnz %%notzerocp
    call Nextwinmode
%%notzerocp
    parttilewin 7,0
    parttilewin 6,1
    parttilewin 5,2
    parttilewin 4,3
    parttilewin 3,4
    parttilewin 2,5
    parttilewin 1,6
    parttilewin 0,7
    inc ecx
    inc edi
    dec dword[tleftnb]
    jnz near %%loopfcp
    sub edi,8
    jmp %%end
%%flipxyfullp
    mov dword[tleftnb],8
    add ecx,7
%%loopfdp
    dec dword[ngcpixleft]
    jnz %%notzerodp
    call Nextwinmode
%%notzerodp
    parttilewin 7,0
    parttilewin 6,1
    parttilewin 5,2
    parttilewin 4,3
    parttilewin 3,4
    parttilewin 2,5
    parttilewin 1,6
    parttilewin 0,7
    dec ecx
    inc edi
    dec dword[tleftnb]
    jnz near %%loopfdp
    sub edi,8
    jmp %%end
%%skip
    processwinpixel
    processwinpixel
    processwinpixel
    processwinpixel
%%end
    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 near %%tileadd
%%next
    dec byte[tleftn]
    jnz near %4
    pop ebx
    ret
%%done
%5
    processwinpixel
    processwinpixel
    processwinpixel
    processwinpixel
    processwinpixel
    processwinpixel
    processwinpixel
    processwinpixel
    add edi,16
    jmp %%ntile
%%docache
    call %3
    jmp %%returnfromcache
%%tileadd
    add ax,[bgtxadd]
    jmp %%next
%endmacro