Subversion Repositories Kolibri OS

;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

;TEXTURE_SIZE EQU (TEX_X * TEX_Y)-1

;Ext = SSE

;SSE = 3

;MMX = 1

;NON = 0

;use32

;------- Big thanks to Majuma (www.majuma.xt.pl) for absolutely great---

;------- DOS 13h mode demos --------------------------------------------

;------- Procedure draws triangle with two overlapped textures, I use --

;--------Catmull Z-buffer algorithm- (Z coordinate interpolation)-------

;--------I calc texture pixel by this way: col1*col2/256 ---------------

two_tex_triangle_z:

;------------------in - eax - x1 shl 16 + y1 -----------

;---------------------- ebx - x2 shl 16 + y2 -----------

;---------------------- ecx - x3 shl 16 + y3 -----------

;---------------------- edx - pointer to b. texture-----

;---------------------- esi - pointer to e. texture-----

;---------------------- edi - pointer to screen buffer--

;---------------------- stack : b. tex coordinates------

;----------------------         e. tex 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 - first texture

.b_x3	equ ebp+12

.b_y3	equ ebp+14	 ; e - second texture

.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_emap equ dword[ebp-8]	; pointer to e. texture

.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]

.dbx12 equ dword[ebp-28]

.dby12 equ dword[ebp-32]

.dby12q equ	[ebp-32]

.dex12 equ dword[ebp-36]

.dey12 equ dword[ebp-40]

.dey12q equ	[ebp-40]

.dz12  equ dword[ebp-44]

.dbx13 equ dword[ebp-52]

.dby13 equ dword[ebp-56]

.dby13q equ	[ebp-56]

.dex13 equ dword[ebp-60]

.dey13 equ dword[ebp-64]

.dey13q equ	[ebp-64]

.dz13  equ dword[ebp-68]

.dbx23 equ dword[ebp-76]

.dby23 equ dword[ebp-80]

.dby23q equ	[ebp-80]

.dex23 equ dword[ebp-84]

.dey23 equ dword[ebp-88]

.dey23q equ	[ebp-88]

.dz23  equ dword[ebp-92]

.cx2   equ dword[ebp-100]

.cbx1  equ dword[ebp-104]

.cby1  equ [ebp-108]

.cex1  equ dword[ebp-112]

.cey1  equ [ebp-116]

.cbx2  equ dword[ebp-120]

.cby2  equ [ebp-124]

.cex2  equ dword[ebp-128]

.cey2  equ [ebp-132]

.cz2   equ dword[ebp-140]

       emms

    else

       cld

    end if

       mov     ebp,esp

       push    edx esi	     ; 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 ebx ecx    ; store triangle coords in variables

;       push     ebx

;       push     ecx

	 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

    ;   jg      .loop23_done

    ;   cmp     .x2,SIZE_X     ; This can be optimized with effort

    ;   jg      .loop23_done

    ;   cmp     .x3,SIZE_X

    ;   jg      .loop23_done    ; {

       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

       cvtsi2ss  xmm3,ebx	     ;rcps

    ;   mov       eax,255

       cvtsi2ss  xmm4,[i255d] ;eax

       divss	 xmm3,xmm4

       rcpss	 xmm3,xmm3

    ;   mulss     xmm3,xmm4

       shufps	 xmm3,xmm3,0

       movd	 mm1,[.b_x2]

       movd	 mm2,[.e_x1]

       movd	 mm3,[.e_x2]

     ;  psubsw    mm3,mm2

     ;  psubsw    mm1,mm0

       pxor	 mm4,mm4

       punpcklwd mm0,mm4

       punpcklwd mm1,mm4

       punpcklwd mm2,mm4

       punpcklwd mm3,mm4

   ;    pslld     mm0,ROUND

   ;    pslld     mm1,ROUND

   ;    pslld     mm2,ROUND

   ;    pslld     mm3,ROUND

       cvtpi2ps  xmm0,mm0

       movlhps	 xmm0,xmm0

       cvtpi2ps  xmm0,mm2

       cvtpi2ps  xmm1,mm1

       movlhps	 xmm1,xmm1

       cvtpi2ps  xmm1,mm3

       subps	 xmm1,xmm0

     ;  movq      mm5,mm1

     ;  movq      mm6,mm1

     ;  pcmpeqb   mm5,mm4

;       psubd     mm1,mm0

;       psubd     mm3,mm2

    ;   movq      mm1,[.e_x1]      ; ex1  ey1   ex2    ey2

    ;   pxor

    ;   punpcklhd mm0,mm1   ; lwd  ;

    ;   psubw     mm1,mm0   ; mm1, mm0

    ;   pxor      mm2,mm2

  ;     pmovmaskb eax,mm1

  ;     and       eax,10101010b

    ;   pcmpgtw   mm2,mm1

    ;   punpcklwd mm1,mm2

 ;      psllw     mm0,ROUND

 ;      psllw     mm1,ROUND

 ;      movq      mm2,mm0

 ;      psrlq     mm0,32

;       movlhps   xmm0,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	 .dey12q,mm0

       movq	 .dby12q,mm1

;       psrlq     mm0,32

;       movd      .dey12,mm0

;       movhlps   xmm1,xmm1

;       cvtps2pi  mm0,xmm1

;       movd      .dbx12,mm0

;       psrlq     mm0,32

;       movd      .dby12,mm0

       mov	ax,word[.b_x2]

       sub	ax,word[.b_x1]

       cwde

       shl	eax,ROUND

       cdq

       idiv	ebx

 ;     mov      .dbx12,eax

       push	 eax

       sub	ax,word[.b_y1]

       cwde

       shl	eax,ROUND

       cdq

       idiv	ebx

 ;     mov      .dby12,eax

       push	 eax

 ;     mov       ebx,.dby12

 ;     int3

       sub	ax,word[.e_x1]

       cwde

       shl	eax,ROUND

       cdq

       idiv	ebx

 ;      mov      .dex12,eax

       push	 eax

       sub	ax,word[.e_y1]

       cwde

       shl	eax,ROUND

       cdq

       idiv	ebx

 ;      mov      .dey12,eax

       push	 eax

	mov	ax,.z2

	sub	ax,.z1

	cwde

	shl	eax,CATMULL_SHIFT

	cdq

	idiv	ebx

	push	eax

   .bt_dx12_done:

       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       eax,255

       cvtsi2ss  xmm4,[i255d]

       divss	 xmm3,xmm4

       rcpss	 xmm3,xmm3

;       mulss     xmm3,xmm4

       shufps	 xmm3,xmm3,0

       sub	 esp,16

       movd	 mm1,[.b_x3]

       movd	 mm2,[.e_x1]

       movd	 mm3,[.e_x3]

       punpcklwd mm0,mm4

       punpcklwd mm1,mm4

       punpcklwd mm2,mm4

       punpcklwd mm3,mm4

       movlhps	 xmm0,xmm0

       cvtpi2ps  xmm0,mm2

       cvtpi2ps  xmm1,mm1

       movlhps	 xmm1,xmm1

       cvtpi2ps  xmm1,mm3

       subps	 xmm1,xmm0

       mulps	 xmm1,xmm3

       shufps	 xmm1,xmm1,10110001b

       cvtps2pi  mm0,xmm1	   ; mm0 -> 2 delta dwords

       movhlps	 xmm1,xmm1

       cvtps2pi  mm1,xmm1

       movq	 .dey13q,mm0

       movq	 .dby13q,mm1

       sub	ax,word[.b_x1]

       cwde

       shl	eax,ROUND

       cdq

       idiv	ebx

 ;      mov      .dbx13,eax

       push	 eax

       sub	ax,word[.b_y1]

       cwde

       shl	eax,ROUND

       cdq

       idiv	ebx

 ;      mov      .dby13,eax

       push	 eax

       sub	ax,word[.e_x1]

       cwde

       shl	eax,ROUND

       cdq

       idiv	ebx

 ;      mov      .dex13,eax

       push	 eax

       sub	ax,word[.e_y1]

       cwde

       shl	eax,ROUND

       cdq

       idiv	ebx

 ;      mov      .dey13,eax

       push	 eax

       sub     ax,.z1

       cwde

       shl     eax,CATMULL_SHIFT

       cdq

       idiv    ebx

  ;    mov    .dz13,eax

       push    eax

   .bt_dx13_done:

       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       eax,255

       cvtsi2ss  xmm4,[i255d] ;eax

       divss	 xmm3,xmm4

       shufps	 xmm3,xmm3,0

       sub	 esp,16

       movd	 mm1,[.b_x3]

       movd	 mm2,[.e_x2]

       movd	 mm3,[.e_x3]

       punpcklwd mm0,mm4

       punpcklwd mm1,mm4

       punpcklwd mm2,mm4

       punpcklwd mm3,mm4

       movlhps	 xmm0,xmm0

       cvtpi2ps  xmm0,mm2

       cvtpi2ps  xmm1,mm1

       movlhps	 xmm1,xmm1

       cvtpi2ps  xmm1,mm3

       subps	 xmm1,xmm0

       shufps	 xmm1,xmm1,10110001b

       cvtps2pi  mm0,xmm1	   ; mm0 -> 2 delta dwords

       movhlps	 xmm1,xmm1

       cvtps2pi  mm1,xmm1

       movq	 .dey23q,mm0

       movq	 .dby23q,mm1

       sub	ax,word[.b_x2]

       cwde

       shl	eax,ROUND

       cdq

       idiv	ebx

 ;      mov      .dbx23,eax

       push	 eax

       sub	ax,word[.b_y2]

       cwde

       shl	eax,ROUND

       cdq

       idiv	ebx

 ;      mov      .dby23,eax

       push	 eax

       sub	ax,word[.e_x2]

       cwde

       shl	eax,ROUND

       cdq

       idiv	ebx

 ;      mov      .dex23,eax

       push	 eax

       sub	ax,word[.e_y2]

       cwde

       shl	eax,ROUND

       cdq

       idiv	ebx

 ;      mov      .dey23,eax

       push	 eax

end if

       mov     ax,.z3

       sub     ax,.z2

       cwde

       shl     eax,CATMULL_SHIFT

       cdq

       idiv    ebx

      ; mov     .dz23,eax

       push    eax

      ;  sub     esp,40

   .bt_dx23_done:

       movsx	eax,.x1

       shl	eax,ROUND

     ;  mov      .cx1,eax

     ;  mov      .cx2,eax

       push	eax eax

     ; push     eax

       shl	eax,ROUND

       mov	.cbx1,eax

       mov	.cbx2,eax

     ;  push     eax eax

     ; push     eax

       shl	eax,ROUND

       mov	.cby1,eax

       mov	.cby2,eax

     ;  push     eax eax

     ; push     eax

       shl	eax,ROUND

       mov	.cex1,eax

       mov	.cex2,eax

      ; push     eax eax

      ;push     eax

       shl	eax,ROUND

       mov	.cey1,eax

       mov	.cey2,eax

       sub	esp,32

      ; push     eax eax

      ;push     eax

       shl	eax,CATMULL_SHIFT

      ; mov      .cz1,eax

      ; mov      .cz2,eax

      push     eax eax

      ;push     eax

       cmp	cx,.y2

       jge	.loop12_done

  .loop12:

       call	.call_line

       add	.cx1,eax

       mov	ebx,.dx12

       add	.cx2,ebx

if Ext>= SSE2

       movups	xmm0,.cey1

       movups	xmm1,.cey2

       movups	xmm2,.dey12q

       movups	xmm3,.dey13q

       paddd	xmm0,xmm3

       paddd	xmm1,xmm2

       movups	.cey1,xmm0

       movups	.cey2,xmm1

else if (Ext = MMX) | (Ext=SSE)

       movq	mm0,.cby2	; with this optimization object

       movq	mm1,.cby1	; looks bit annoying

       movq	mm2,.cey2

       movq	mm3,.cey1

       paddd	mm0,.dby12q

       paddd	mm1,.dby13q

       paddd	mm2,.dey12q

       paddd	mm3,.dey13q

       movq	.cby2,mm0

       movq	.cby1,mm1

       movq	.cey1,mm3

       movq	.cey2,mm2

else

       mov	edx,.dbx13

       add	.cbx1,edx

       mov	eax,.dbx12

       add	.cbx2,eax

       mov	ebx,.dby13

       add	.cby1,ebx

       mov	edx,.dby12

       add	.cby2,edx

       add	.cex1,eax

       mov	ebx,.dex12

       add	.cex2,ebx

       mov	edx,.dey13

       add	.cey1,edx

       mov	eax,.dey12

       add	.cey2,eax

       mov	ebx,.dz13

       add	.cz1,ebx

       mov	edx,.dz12

       add	.cz2,edx

       cmp	cx,.y2

       jl	.loop12

    .loop12_done:

       cmp	cx,.y3

       jge	.loop23_done

       shl	eax,CATMULL_SHIFT

       mov	.cz2,eax

       shl	eax,ROUND

       mov	.cx2,eax

       shl	eax,ROUND

       mov	.cbx2,eax

       shl	eax,ROUND

       mov	.cby2,eax

       shl	eax,ROUND

       mov	.cex2,eax

       shl	eax,ROUND

       mov	.cey2,eax

       call	.call_line

;if Ext = NON

       mov	eax,.dx13

       add	.cx1,eax

       mov	ebx,.dx23

       add	.cx2,ebx

if Ext>= SSE2

       movups	xmm0,.cey1

       movups	xmm1,.cey2

       movups	xmm2,.dey23q

       movups	xmm3,.dey13q

       paddd	xmm0,xmm3

       paddd	xmm1,xmm2

       movups	.cey1,xmm0

       movups	.cey2,xmm1

else if (Ext = MMX) | ( Ext = SSE)

       movq	mm0,.cby2	 ;    with this mmx optimization object looks bit

       movq	mm1,.cby1	 ;    annoying

       movq	mm2,.cey2

       movq	mm3,.cey1

       paddd	mm0,.dby23q

       paddd	mm1,.dby13q

       paddd	mm2,.dey23q

       paddd	mm3,.dey13q

       movq	.cby2,mm0

       movq	.cby1,mm1

       movq	.cey2,mm2

       movq	.cey1,mm3

       mov	edx,.dbx13

       add	.cbx1,edx

       mov	eax,.dbx23

       add	.cbx2,eax

       mov	ebx,.dby13

       add	.cby1,ebx

       mov	edx,.dby23

       add	.cby2,edx

       add	.cex1,eax

       mov	ebx,.dex23

       add	.cex2,ebx

       mov	edx,.dey13

       add	.cey1,edx

       mov	eax,.dey23

       add	.cey2,eax

end if

       add	.cz1,ebx

       mov	edx,.dz23

       add	.cz2,edx

;else

;       movq     mm0,.db13q

;       movq     mm1,.cbx1q

       cmp	cx,.y3

       jl	.loop23

    .loop23_done:

ret   34

       push	.cz2

       push	.z_buff

       push	.t_bmap

       push	.t_emap

       push	dword .cey2

       push	.cex2

       push	dword .cey1

       push	.cex1

       push	dword .cby2

       push	.cbx2

       push	dword .cby1

       push	.cbx1

       push	ecx

       sar	eax,ROUND

       mov	ebx,.cx2

       sar	ebx,ROUND

ret

two_tex_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  [ebp+12]  ;       |

.bx2	equ  [ebp+16]  ;       |

.by2	equ  [ebp+20]  ;       |>   b. texture and e. texture coords

.ex1	equ  [ebp+24]  ;       |>   shifted shl ROUND

.ey1	equ  [ebp+28]  ;       |

.ex2	equ  [ebp+32]  ;       |

.ey2	equ  [ebp+36]  ;   ---

.emap	equ  [ebp+40]  ; b texture offset

.bmap	equ  [ebp+44]  ; e texture offset

.z_buff equ dword [ebp+48]

.z2	equ dword [ebp+52]  ;   -- |>   z coords shifted

.z1	equ dword [ebp+56]  ;   --       shl  CATMULL_SHIFT

.x2	equ dword [ebp-8]

.dbx	equ [ebp-12]

.dex	equ [ebp-16]

.dby	equ [ebp-20]

.dey	equ [ebp-24]

.dz	equ dword [ebp-28]

.cbx	equ [ebp-32]

.cex	equ [ebp-36]

.cby	equ [ebp-40]

.cey	equ [ebp-44]

.cz	equ dword [ebp-48]

.czbuff equ dword [ebp-52]

	or	ecx,ecx

	jl	.bl_end

	cmp	cx,word[size_y_var]  ;SIZE_Y

	jge	.bl_end

	jl	@f

	je	.bl_end

if Ext=NON

	mov	edx,.bx1

	xchg	edx,.bx2

	mov	.bx1,edx

	mov	edx,.by1

	xchg	edx,.by2

	mov	.by1,edx

	xchg	edx,.ex2

	mov	.ex1,edx

	mov	edx,.ey1

	xchg	edx,.ey2

	mov	.ey1,edx

else

	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

	mov	edx,.z1

	xchg	edx,.z2

	mov	.z1,edx

    @@:

	push	eax ebx    ;store x1, x2

	mov	ebx,.x1

	movzx	edx,word[size_x_var]

	cmp	ebx,edx

  ;      cmp     bx,word[size_x_var]  ;SIZE_X

	jg	.bl_end

	cmp	.x2,0

	jle	.bl_end

	sub	ebx,.x1

       cvtsi2ss  xmm3,ebx	     ;rcps

       shufps	 xmm3,xmm3,0

  ;     movq      mm1,.bx2q

  ;     movq      mm2,.ex1q

  ;     movq      mm3,.ex2q

  ;     psubd     mm1,mm0

  ;     psubd     mm3,mm2

  ;     cvtpi2ps  xmm1,mm1

  ;     movlhps   xmm1,xmm1

  ;     cvtpi2ps  xmm1,mm3

       movlhps	 xmm0,xmm0

       cvtpi2ps  xmm0,.ex1 ;mm2     ; ex1; ey1

       cvtpi2ps  xmm1,.bx2 ;mm1     ; bx2; by2

       movlhps	 xmm1,xmm1

       cvtpi2ps  xmm1,.ex2 ;mm3     ; ex2; ey2

       subps	 xmm1,xmm0

				    ; hi             lo

       divps	 xmm1,xmm3 ; xmm1 -> dby; dbx; dey; dex

       cvtps2pi  mm0,xmm1	   ; mm0 -> 2 delta dwords

       movhlps	 xmm1,xmm1

       cvtps2pi  mm1,xmm1

       movq	 .dex,mm0 ; hi - lo  ->  dbx, dex

       movq	 .dey,mm1 ; hi - lo  ->  dby, dey

	sub	eax,.bx1

	cdq

	idiv	ebx

	push	eax

	sub	eax,.ex1

	cdq

	idiv	ebx

	push	eax

	sub	eax,.by1

	cdq

	idiv	ebx

	push	eax

	sub	eax,.ey1

	cdq

	idiv	ebx

	push	eax

	sub	eax,.z1

	cdq

	idiv	ebx

	push	eax

	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

	imul	ebx

	add    .bx1,eax

	imul	ebx

	add	.by1,eax

	imul	ebx

	add	.ex1,eax

	imul	ebx

	add	.ey1,eax

      @@:

	movzx	eax,word[size_x_var] ;SIZE_X  ;word[size_x_var]

	mov	ebx,.x2

	cmp	eax,ebx

	jg	@f

	mov	.x2,eax

      @@:

      ;  movd    mm0,eax

      ;  movd    mm1,.x2

      ;  pminsw  mm0,mm1

      ;  movd    .x2,mm0

 ;       cmp     .x2,SIZE_X  ;eax   |

 ;       jl      @f                 |>       this dont work idk cause

 ;       mov     .x2,SIZE_X ;eax    |

      @@:

      ;  movzx   eax,word[size_x_var]       ;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 	  ; edi - screen

	mov	esi,.z_buff	  ; z-buffer filled with dd variables

	shl	ebx,2

	add	esi,ebx 	  ; esi - Z buffer

	sub	ecx,.x1

	; init current variables

	push	dword .bx1 ;.by1 .ex1 .ey1 .z1 esi

	push	dword .ex1

	push	dword .by1

	push	dword .ey1

	push	esi

     pxor   mm0,mm0

     movq   mm3,.cex   ; hi - lo -> cbx; cex

     movq   mm4,.cey   ; hi - lo -> cby; cey

;     movq   mm5,mm3

;     movq   mm6,mm4

;     psrad  mm5,ROUND

;     psrad  mm6,ROUND

;     movq   .ceyq,mm5

;     movq   .cbyq,mm6

     mov    edx,.czbuff

else

     cld

end if

     .draw:

    ; if TEX = SHIFTING   ;bump drawing only in shifting mode

if Ext=NON

	mov	esi,.czbuff	 ; .czbuff current address in buffer

	mov	ebx,.cz 	 ; .cz - cur z position

	cmp	ebx,dword[esi]

else

	mov	ebx,.cz

	cmp	ebx,dword[edx]

end if

	jge	.skip

	mov	eax,.cby

	mov	esi,.cbx

	sar	eax,ROUND

	sar	esi,ROUND

	shl	eax,TEX_SHIFT	;-

	add	esi,eax

	lea	esi,[esi*3]	    ;-  ; esi - current b. texture addres

	add	esi,.bmap

	mov	eax,.cey       ;.cey - current  env map y

	sar	ebx,ROUND

	sar	eax,ROUND

	add	ebx,eax

	lea	ebx,[ebx*3]

	add	ebx,.emap

	movq	mm5,mm4 ;.cey

	psrad	mm5,ROUND

	pslld	mm5,TEX_SHIFT

	movq	mm6,mm3 ;.cex

	psrad	mm6,ROUND

	paddd	mm5,mm6

	movq	mm6,mm5

	paddd	mm5,mm5

	paddd	mm5,mm6

	paddd	mm5,.emap

	movd	esi,mm5

	psrlq	mm5,32

	movd	ebx,mm5

end if

if Ext>=MMX

	movd	  mm1,[esi]

	movd	  mm2,[ebx]

	punpcklbw mm1,mm0

	punpcklbw mm2,mm0

	pmullw	  mm1,mm2

	psrlw	  mm1,8

	packuswb  mm1,mm0

	movd	  [edi],mm1

	mov	  ebx,.cz

	mov	  dword[edx],ebx

else

	cld			; esi - tex e.

	lodsb			; ebx - tex b.

	mov	dl,[ebx]

	mul	dl

	shr	ax,8

	stosb

	inc	ebx

	lodsb

	mov	dl,[ebx]

	mul	dl

	shr	ax,8

	stosb

	inc	ebx

	lodsb

	mov	dl,[ebx]

	mul	dl

	shr	ax,8

	stosb

	mov	ebx,.cz

	mov	esi,.czbuff

	mov	dword[esi],ebx

	jmp	.no_skip

end if

     .skip:

	add	edi,3

     .no_skip:

	add	.czbuff,4

	mov	eax,.dbx

	add	.cbx,eax

	mov	eax,.dby

	add	.cby,eax

	mov	eax,.dex

	add	.cex,eax