;SIZE_X equ 350 ;SIZE_Y equ 350 ROUND equ 8 ;TEX_X equ 512 ;TEX_Y equ 512 ;TEXTURE_SIZE EQU (512*512)-1 ;TEX_SHIFT EQU 9 CATMULL_SHIFT equ 8 ;TEXTURE_SIZE EQU (TEX_X * TEX_Y)-1 ;Ext = NON ;MMX = 1 ;NON = 0 ;------- Big thanks to Majuma (www.majuma.xt.pl) for absolutely great--- ;------- DOS 13h mode demos -------------------------------------------- ;------- Procedure draws bump triangle using Catmull Z-buffer algorithm- ;------- (Z coordinate interpolation)----------------------------------- bump_triangle_z: ;------------------in - eax - x1 shl 16 + y1 ----------- ;---------------------- ebx - x2 shl 16 + y2 ----------- ;---------------------- ecx - x3 shl 16 + y3 ----------- ;---------------------- edx - pointer to bump map ------ ;---------------------- esi - pointer to environment map ;---------------------- edi - pointer to screen buffer-- ;---------------------- stack : bump coordinates-------- ;---------------------- environment coordinates- ;---------------------- Z position coordinates-- ;---------------------- pointer io Z buffer----- ;-- Z-buffer - filled with coordinates as dword -------- ;-- (Z coor. as word) shl CATMULL_SHIFT ---------------- .b_x1 equ ebp+4 ; procedure don't save registers !!! .b_y1 equ ebp+6 ; each coordinate as word .b_x2 equ ebp+8 .b_y2 equ ebp+10 .b_x3 equ ebp+12 .b_y3 equ ebp+14 .e_x1 equ ebp+16 .e_y1 equ ebp+18 .e_x2 equ ebp+20 .e_y2 equ ebp+22 .e_x3 equ ebp+24 .e_y3 equ ebp+26 .z1 equ word[ebp+28] .z2 equ word[ebp+30] .z3 equ word[ebp+32] .z_buff equ dword[ebp+34] ; pointer to Z-buffer .t_bmap equ dword[ebp-4] ; pointer to bump map .t_emap equ dword[ebp-8] ; pointer to e. map .x1 equ word[ebp-10] .y1 equ word[ebp-12] .x2 equ word[ebp-14] .y2 equ word[ebp-16] .x3 equ word[ebp-18] .y3 equ word[ebp-20] .dx12 equ dword[ebp-24] .dz12 equ [ebp-28] .dbx12 equ dword[ebp-32] .dby12 equ [ebp-36] .dex12 equ dword[ebp-40] .dey12 equ [ebp-44] .dx13 equ dword[ebp-48] .dz13 equ [ebp-52] .dbx13 equ dword[ebp-56] .dby13 equ [ebp-60] .dex13 equ dword[ebp-64] .dey13 equ [ebp-68] .dx23 equ dword[ebp-72] .dz23 equ [ebp-76] .dbx23 equ dword[ebp-80] .dby23 equ [ebp-84] .dex23 equ dword[ebp-88] .dey23 equ [ebp-92] .cx1 equ dword[ebp-96] ; current variables .cz1 equ [ebp-100] .cx2 equ dword[ebp-104] .cz2 equ [ebp-108] .cbx1 equ dword[ebp-112] .cby1 equ [ebp-116] .cex1 equ dword[ebp-120] .cey1 equ [ebp-124] .cbx2 equ dword[ebp-128] .cby2 equ [ebp-132] .cex2 equ dword[ebp-136] .cey2 equ [ebp-140] mov ebp,esp push edx ; store bump map push esi ; store e. map ; sub esp,120 .sort3: ; sort triangle coordinates... cmp ax,bx jle .sort1 xchg eax,ebx mov edx,dword[.b_x1] xchg edx,dword[.b_x2] mov dword[.b_x1],edx mov edx,dword[.e_x1] xchg edx,dword[.e_x2] mov dword[.e_x1],edx mov dx,.z1 xchg dx,.z2 mov .z1,dx .sort1: cmp bx,cx jle .sort2 xchg ebx,ecx mov edx,dword[.b_x2] xchg edx,dword[.b_x3] mov dword[.b_x2],edx mov edx,dword[.e_x2] xchg edx,dword[.e_x3] mov dword[.e_x2],edx mov dx,.z2 xchg dx,.z3 mov .z2,dx jmp .sort3 .sort2: push eax ; store triangle coords in variables push ebx push ecx mov edx,80008000h ; eax,ebx,ecx are ANDd together into edx which means that and edx,ebx ; if *all* of them are negative a sign flag is raised and edx,ecx and edx,eax test edx,80008000h ; Check both X&Y at once jne .loop23_done ; mov edx,eax ; eax,ebx,ecx are ORd together into edx which means that ; or edx,ebx ; if any *one* of them is negative a sign flag is raised ; or edx,ecx ; test edx,80000000h ; Check only X ; jne .loop23_done ; cmp .x1,SIZE_X ; { ; jg .loop23_done ; cmp .x2,SIZE_X ; This can be optimized with effort ; jg .loop23_done ; cmp .x3,SIZE_X ; jg .loop23_done ; { mov bx,.y2 ; calc delta 12 sub bx,.y1 jnz .bt_dx12_make mov ecx,6 xor edx,edx @@: push edx ;dword 0 loop @b jmp .bt_dx12_done .bt_dx12_make: mov ax,.x2 sub ax,.x1 cwde movsx ebx,bx shl eax,ROUND cdq idiv ebx ; mov .dx12,eax push eax mov ax,.z2 sub ax,.z1 cwde shl eax,CATMULL_SHIFT cdq idiv ebx push eax if Ext>=SSE sub esp,16 cvtsi2ss xmm3,ebx ;rcps ; mov eax,255 cvtsi2ss xmm4,[i255d] divss xmm3,xmm4 rcpss xmm3,xmm3 ; mulss xmm3,xmm4 shufps xmm3,xmm3,0 movd mm0,[.b_x1] movd mm1,[.b_x2] movd mm2,[.e_x1] movd mm3,[.e_x2] pxor mm4,mm4 punpcklwd mm0,mm4 punpcklwd mm1,mm4 punpcklwd mm2,mm4 punpcklwd mm3,mm4 psubd mm1,mm0 psubd mm3,mm2 ; cvtpi2ps xmm0,mm0 ; movlhps xmm0,xmm0 ; cvtpi2ps xmm0,mm2 cvtpi2ps xmm1,mm1 movlhps xmm1,xmm1 cvtpi2ps xmm1,mm3 ; subps xmm1,xmm0 ; cvtpi2ps xmm0,mm3 ; divps xmm1,xmm3 mulps xmm1,xmm3 shufps xmm1,xmm1,10110001b cvtps2pi mm0,xmm1 ; mm0 -> 2 delta dwords movhlps xmm1,xmm1 cvtps2pi mm1,xmm1 movq .dey12,mm0 movq .dby12,mm1 else mov ax,word[.b_x2] sub ax,word[.b_x1] cwde shl eax,ROUND cdq idiv ebx ; mov .dbx12,eax push eax mov ax,word[.b_y2] sub ax,word[.b_y1] cwde shl eax,ROUND cdq idiv ebx ; mov .dby12,eax push eax mov ax,word[.e_x2] sub ax,word[.e_x1] cwde shl eax,ROUND cdq idiv ebx ; mov .dex12,eax push eax mov ax,word[.e_y2] sub ax,word[.e_y1] cwde shl eax,ROUND cdq idiv ebx ; mov .dey12,eax push eax end if .bt_dx12_done: mov bx,.y3 ; calc delta13 sub bx,.y1 jnz .bt_dx13_make mov ecx,6 xor edx,edx @@: push edx ;dword 0 loop @b jmp .bt_dx13_done .bt_dx13_make: mov ax,.x3 sub ax,.x1 cwde movsx ebx,bx shl eax,ROUND cdq idiv ebx ; mov .dx13,eax push eax mov ax,.z3 sub ax,.z1 cwde shl eax,CATMULL_SHIFT cdq idiv ebx ; mov .dz13,eax push eax if Ext>=SSE sub esp,16 cvtsi2ss xmm3,ebx ;rcps ; mov eax,255 cvtsi2ss xmm4,[i255d] divss xmm3,xmm4 rcpss xmm3,xmm3 ; mulss xmm3,xmm4 shufps xmm3,xmm3,0 movd mm0,[.b_x1] movd mm1,[.b_x3] movd mm2,[.e_x1] movd mm3,[.e_x3] pxor mm4,mm4 punpcklwd mm0,mm4 punpcklwd mm1,mm4 punpcklwd mm2,mm4 punpcklwd mm3,mm4 psubd mm1,mm0 psubd mm3,mm2 ; cvtpi2ps xmm0,mm0 ; movlhps xmm0,xmm0 ; cvtpi2ps xmm0,mm2 cvtpi2ps xmm1,mm1 movlhps xmm1,xmm1 cvtpi2ps xmm1,mm3 ; subps xmm1,xmm0 ; cvtpi2ps xmm0,mm3 ; divps xmm1,xmm3 mulps xmm1,xmm3 shufps xmm1,xmm1,10110001b cvtps2pi mm0,xmm1 ; mm0 -> 2 delta dwords movhlps xmm1,xmm1 cvtps2pi mm1,xmm1 movq .dey13,mm0 movq .dby13,mm1 else mov ax,word[.b_x3] sub ax,word[.b_x1] cwde shl eax,ROUND cdq idiv ebx ; mov .dbx13,eax push eax mov ax,word[.b_y3] sub ax,word[.b_y1] cwde shl eax,ROUND cdq idiv ebx ; mov .dby13,eax push eax mov ax,word[.e_x3] sub ax,word[.e_x1] cwde shl eax,ROUND cdq idiv ebx ; mov .dex13,eax push eax mov ax,word[.e_y3] sub ax,word[.e_y1] cwde shl eax,ROUND cdq idiv ebx ; mov .dey13,eax push eax end if .bt_dx13_done: mov bx,.y3 ; calc delta23 sub bx,.y2 jnz .bt_dx23_make mov ecx,6 xor edx,edx @@: push edx ;dword 0 loop @b jmp .bt_dx23_done .bt_dx23_make: mov ax,.x3 sub ax,.x2 cwde movsx ebx,bx shl eax,ROUND cdq idiv ebx ; mov .dx23,eax push eax mov ax,.z3 sub ax,.z2 cwde shl eax,CATMULL_SHIFT cdq idiv ebx ; mov .dz23,eax push eax ; sub esp,40 if Ext>=SSE sub esp,16 cvtsi2ss xmm3,ebx ;rcps ; mov eax,255 cvtsi2ss xmm4,[i255d] divss xmm3,xmm4 rcpss xmm3,xmm3 ; mulss xmm3,xmm4 shufps xmm3,xmm3,0 movd mm0,[.b_x2] movd mm1,[.b_x3] movd mm2,[.e_x2] movd mm3,[.e_x3] pxor mm4,mm4 punpcklwd mm0,mm4 punpcklwd mm1,mm4 punpcklwd mm2,mm4 punpcklwd mm3,mm4 psubd mm1,mm0 psubd mm3,mm2 ; cvtpi2ps xmm0,mm0 ; movlhps xmm0,xmm0 ; cvtpi2ps xmm0,mm2 cvtpi2ps xmm1,mm1 movlhps xmm1,xmm1 cvtpi2ps xmm1,mm3 ; subps xmm1,xmm0 ; cvtpi2ps xmm0,mm3 ; divps xmm1,xmm3 mulps xmm1,xmm3 shufps xmm1,xmm1,10110001b cvtps2pi mm0,xmm1 ; mm0 -> 2 delta dwords movhlps xmm1,xmm1 cvtps2pi mm1,xmm1 movq .dey23,mm0 movq .dby23,mm1 else mov ax,word[.b_x3] sub ax,word[.b_x2] cwde shl eax,ROUND cdq idiv ebx ; mov .dbx23,eax push eax mov ax,word[.b_y3] sub ax,word[.b_y2] cwde shl eax,ROUND cdq idiv ebx ; mov .dby23,eax push eax mov ax,word[.e_x3] sub ax,word[.e_x2] cwde shl eax,ROUND cdq idiv ebx ; mov .dex23,eax push eax mov ax,word[.e_y3] sub ax,word[.e_y2] cwde shl eax,ROUND cdq idiv ebx ; mov .dey23,eax push eax end if .bt_dx23_done: sub esp,48 movsx eax,.x1 shl eax,ROUND mov .cx1,eax mov .cx2,eax ; push eax ; push eax movsx eax,word[.b_x1] shl eax,ROUND mov .cbx1,eax mov .cbx2,eax ; push eax ; push eax movsx eax,word[.b_y1] shl eax,ROUND mov .cby1,eax mov .cby2,eax ; push eax ; push eax movsx eax,word[.e_x1] shl eax,ROUND mov .cex1,eax mov .cex2,eax ; push eax ; push eax movsx eax,word[.e_y1] shl eax,ROUND mov .cey1,eax mov .cey2,eax ; push eax ; push eax movsx eax,.z1 shl eax,CATMULL_SHIFT mov .cz1,eax mov .cz2,eax ; push eax ; push eax movsx ecx,.y1 cmp cx,.y2 jge .loop12_done .loop12: call .call_bump_line if Ext >= SSE2 movups xmm0,.cey2 movups xmm1,.cey1 movups xmm2,.dey12 movups xmm3,.dey13 paddd xmm0,xmm2 paddd xmm1,xmm3 movups .cey2,xmm0 movups .cey1,xmm1 movq mm4,.cz1 movq mm5,.cz2 paddd mm4,.dz13 paddd mm5,.dz12 movq .cz1,mm4 movq .cz2,mm5 end if if (Ext = MMX) | (Ext = SSE) movq mm0,.cby2 movq mm1,.cby1 movq mm2,.cey2 movq mm3,.cey1 movq mm4,.cz1 movq mm5,.cz2 paddd mm0,.dby12 paddd mm1,.dby13 paddd mm2,.dey12 paddd mm3,.dey13 paddd mm4,.dz13 paddd mm5,.dz12 movq .cby2,mm0 movq .cby1,mm1 movq .cey1,mm3 movq .cey2,mm2 movq .cz1,mm4 movq .cz2,mm5 else if Ext = NON mov edx,.dbx13 add .cbx1,edx mov eax,.dbx12 add .cbx2,eax mov ebx,.dby13 add .cby1,ebx mov edx,.dby12 add .cby2,edx mov eax,.dex13 add .cex1,eax mov ebx,.dex12 add .cex2,ebx mov edx,.dey13 add .cey1,edx mov eax,.dey12 add .cey2,eax mov eax,.dx13 add .cx1,eax mov ebx,.dx12 add .cx2,ebx mov ebx,.dz13 add .cz1,ebx mov edx,.dz12 add .cz2,edx end if inc ecx cmp cx,.y2 jl .loop12 .loop12_done: movsx ecx,.y2 cmp cx,.y3 jge .loop23_done movsx eax,.z2 shl eax,CATMULL_SHIFT mov .cz2,eax movsx eax,.x2 shl eax,ROUND mov .cx2,eax movzx eax,word[.b_x2] shl eax,ROUND mov .cbx2,eax movzx eax,word[.b_y2] shl eax,ROUND mov .cby2,eax movzx eax,word[.e_x2] shl eax,ROUND mov .cex2,eax movzx eax,word[.e_y2] shl eax,ROUND mov .cey2,eax .loop23: call .call_bump_line if Ext >= SSE2 movups xmm0,.cey2 movups xmm1,.cey1 movups xmm2,.dey23 movups xmm3,.dey13 paddd xmm0,xmm2 paddd xmm1,xmm3 movups .cey2,xmm0 movups .cey1,xmm1 movq mm4,.cz1 movq mm5,.cz2 paddd mm4,.dz13 paddd mm5,.dz23 movq .cz1,mm4 movq .cz2,mm5 end if if (Ext = MMX) | (Ext = SSE) movq mm0,.cby2 movq mm1,.cby1 movq mm2,.cey2 movq mm3,.cey1 movq mm4,.cz1 movq mm5,.cz2 paddd mm0,.dby23 paddd mm1,.dby13 paddd mm2,.dey23 paddd mm3,.dey13 paddd mm4,.dz13 paddd mm5,.dz23 movq .cby2,mm0 movq .cby1,mm1 movq .cey1,mm3 movq .cey2,mm2 movq .cz1,mm4 movq .cz2,mm5 else if Ext = NON mov eax,.dx13 add .cx1,eax mov ebx,.dx23 add .cx2,ebx mov edx,.dbx13 add .cbx1,edx mov eax,.dbx23 add .cbx2,eax mov ebx,.dby13 add .cby1,ebx mov edx,.dby23 add .cby2,edx mov eax,.dex13 add .cex1,eax mov ebx,.dex23 add .cex2,ebx mov edx,.dey13 add .cey1,edx mov eax,.dey23 add .cey2,eax mov ebx,.dz13 add .cz1,ebx mov edx,.dz23 add .cz2,edx end if inc ecx cmp cx,.y3 jl .loop23 .loop23_done: mov esp,ebp ret 34 .call_bump_line: ; push ebp ; push ecx pushad push dword .cz1 push dword .cz2 push .z_buff push .t_emap push .t_bmap push dword .cey2 push .cex2 push dword .cby2 push .cbx2 push dword .cey1 push .cex1 push dword .cby1 push .cbx1 push ecx mov eax,.cx1 sar eax,ROUND mov ebx,.cx2 sar ebx,ROUND call bump_line_z popad ret bump_line_z: ;--------------in: eax - x1 ;-------------- ebx - x2 ;-------------- edi - pointer to screen buffer ;stack - another parameters : .y equ dword [ebp+4] .bx1 equ [ebp+8] ; --- .by1 equ dword [ebp+12] ; | .ex1 equ [ebp+16] ; | .ey1 equ dword [ebp+20] ; |> bump and env coords .bx2 equ [ebp+24] ; |> shifted shl ROUND .by2 equ dword [ebp+28] ; | .ex2 equ [ebp+32] ; | .ey2 equ dword [ebp+36] ; --- .bmap equ dword [ebp+40] .emap equ dword [ebp+44] .z_buff equ dword [ebp+48] .z2 equ dword [ebp+52] ; -- |> z coords shifted .z1 equ dword [ebp+56] ; -- shl CATMULL_SHIFT .x1 equ dword [ebp-4] .x2 equ dword [ebp-8] .dbx equ dword [ebp-12] .dby equ [ebp-16] .dex equ dword [ebp-20] .dey equ [ebp-24] .dz equ dword [ebp-28] .cbx equ dword [ebp-32] .cby equ [ebp-36] .cex equ dword [ebp-40] .cey equ [ebp-44] .cz equ dword [ebp-48] .czbuff equ dword [ebp-52] .temp1 equ ebp-60 .temp2 equ ebp-68 .temp3 equ ebp-76 .temp4 equ ebp-84 .temp5 equ ebp-92 mov ebp,esp mov ecx,.y or ecx,ecx jl .bl_end cmp ecx,SIZE_Y jge .bl_end cmp eax,ebx jl .bl_ok je .bl_end xchg eax,ebx if Ext=NON mov edx,.bx1 xchg edx,.bx2 mov .bx1,edx mov edx,.by1 xchg edx,.by2 mov .by1,edx mov edx,.ex1 xchg edx,.ex2 mov .ex1,edx mov edx,.ey1 xchg edx,.ey2 mov .ey1,edx end if if Ext = MMX movq mm0,.bx1 movq mm1,.ex1 movq mm2,.bx2 movq mm3,.ex2 movq .bx2,mm0 movq .ex2,mm1 movq .bx1,mm2 movq .ex1,mm3 end if if Ext >= SSE movups xmm0,.bx1 movups xmm1,.bx2 movups .bx2,xmm0 movups .bx1,xmm1 end if mov edx,.z1 xchg edx,.z2 mov .z1,edx .bl_ok: push eax push ebx ;store x1, x2 cmp .x1,SIZE_X jge .bl_end cmp .x2,0 jle .bl_end mov ebx,.x2 sub ebx,.x1 if Ext >= SSE sub esp,16 cvtsi2ss xmm3,ebx ;rcps shufps xmm3,xmm3,0 cvtpi2ps xmm0,.bx1 ;mm0 movlhps xmm0,xmm0 cvtpi2ps xmm0,.ex1 ;mm2 cvtpi2ps xmm1,.bx2 ;mm1 movlhps xmm1,xmm1 cvtpi2ps xmm1,.ex2 ;mm3 subps xmm1,xmm0 divps xmm1,xmm3 shufps xmm1,xmm1,10110001b cvtps2pi mm0,xmm1 ; mm0 -> 2 delta dwords movhlps xmm1,xmm1 cvtps2pi mm1,xmm1 movq .dey,mm0 movq .dby,mm1 else mov eax,.bx2 ; calc .dbx sub eax,.bx1 cdq idiv ebx push eax mov eax,.by2 ; calc .dby sub eax,.by1 cdq idiv ebx push eax mov eax,.ex2 ; calc .dex sub eax,.ex1 cdq idiv ebx push eax mov eax,.ey2 ; calc .dey sub eax,.ey1 cdq idiv ebx push eax end if mov eax,.z2 ; calc .dz sub eax,.z1 cdq idiv ebx push eax cmp .x1,0 ; set correctly begin variable jge @f ; CLIPPING ON FUNCTION ; cutting triangle exceedes screen mov ebx,.x1 neg ebx imul ebx ; eax = .dz * abs(.x1) add .z1,eax mov .x1,0 mov eax,.dbx imul ebx add .bx1,eax mov eax,.dby imul ebx add .by1,eax mov eax,.dex imul ebx add .ex1,eax mov eax,.dey imul ebx add .ey1,eax @@: cmp .x2,SIZE_X jl @f mov .x2,SIZE_X @@: mov eax,SIZE_X ;calc memory begin in buffers mov ebx,.y mul ebx mov ebx,.x1 add eax,ebx mov ebx,eax lea eax,[eax*3] add edi,eax mov esi,.z_buff ; z-buffer filled with dd variables shl ebx,2 add esi,ebx mov ecx,.x2 sub ecx,.x1 ; init current variables push dword .bx1 push .by1 push dword .ex1 push .ey1 push .z1 ; current z shl CATMULL_SHIFT push esi ;if Ext = SSE2 ; movups xmm1,.dey ;end if if Ext>=MMX movq mm0,.cby movq mm1,.cey movq mm2,.dby movq mm3,.dey end if ;align 16 .draw: ; if TEX = SHIFTING ;bump drawing only in shifting mode mov esi,.czbuff ; .czbuff current address in buffer mov ebx,.cz ; .cz - cur z position cmp ebx,dword[esi] jge .skip if Ext>=MMX movq mm6,mm0 psrld mm6,ROUND movd eax,mm6 psrlq mm6,32 movd esi,mm6 else mov eax,.cby sar eax,ROUND mov esi,.cbx sar esi,ROUND end if shl eax,TEX_SHIFT ;- add esi,eax ;- ; esi - current bump map index mov ebx,esi dec ebx and ebx,TEXTURE_SIZE add ebx,.bmap movzx eax,byte [ebx] mov ebx,esi inc ebx and ebx,TEXTURE_SIZE add ebx,.bmap movzx ebx,byte [ebx] sub eax,ebx mov ebx,esi sub ebx,TEX_X and ebx,TEXTURE_SIZE add ebx,.bmap movzx edx,byte [ebx] mov ebx,esi add ebx,TEX_X and ebx,TEXTURE_SIZE add ebx,.bmap movzx ebx,byte [ebx] sub edx,ebx ; eax - horizontal sub ; edx - vertical sub if Ext = NON mov ebx,.cex ;.cex - current env map X sar ebx,ROUND add eax,ebx ; eax - modified x coord mov ebx,.cey ;.cey - current env map y sar ebx,ROUND add edx,ebx ; edx - modified y coord else movq mm6,mm1 ; mm5 - copy of cur env coords psrld mm6,ROUND movd ebx,mm6 psrlq mm6,32 add eax,ebx movd ebx,mm6 add edx,ebx end if or eax,eax jl .black cmp eax,TEX_X jg .black or edx,edx jl .black cmp edx,TEX_Y jg .black shl edx,TEX_SHIFT add edx,eax lea esi,[edx*3] add esi,.emap lodsd jmp .put_pixel .black: xor eax,eax .put_pixel: stosd dec edi mov ebx,.cz mov esi,.czbuff mov dword[esi],ebx jmp .no_skip .skip: add edi,3 .no_skip: add .czbuff,4 ;if Ext = SSE2 ; movups xmm0,.cey ; paddd xmm0,xmm1 ; movups .cey,xmm0 ; ;end if if Ext >= MMX paddd mm0,mm2 paddd mm1,mm3 end if if Ext=NON mov eax,.dbx add .cbx,eax mov eax,.dby add .cby,eax mov eax,.dex add .cex,eax mov eax,.dey add .cey,eax end if mov eax,.dz add .cz,eax dec ecx jnz .draw ; end if .bl_end: mov esp,ebp ret 56