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; fill triangle profile

; #define PROFILE

CLIP_XMIN equ (1<<0)

CLIP_XMAX equ (1<<1)

CLIP_YMIN equ (1<<2)

CLIP_YMAX equ (1<<3)

CLIP_ZMIN equ (1<<4)

CLIP_ZMAX equ (1<<5)

align 16

proc gl_transform_to_viewport uses eax ebx ecx, context:dword,v:dword

	mov eax,[context]

	mov ebx,[v]

	; coordinates

	fld1

	fdiv dword[ebx+GLVertex.pc+offs_W] ;st0 = 1/v.pc.W

	fld dword[ebx+GLVertex.pc+offs_X] ;st0 = v.pc.X

	fmul st0,st1

	fmul dword[eax+GLContext.viewport+GLViewport.scale+offs_X]

	fadd dword[eax+GLContext.viewport+GLViewport.trans+offs_X]

	fistp dword[ebx+GLVertex.zp] ;v.zp.x = st0, st0 = st1

	fld dword[ebx+GLVertex.pc+offs_Y] ;st0 = v.pc.Y

	fmul st0,st1

	fmul dword[eax+GLContext.viewport+GLViewport.scale+offs_Y]

	fadd dword[eax+GLContext.viewport+GLViewport.trans+offs_Y]

	fistp dword[ebx+GLVertex.zp+ZBufferPoint.y] ;v.zp.y = st0, st0 = st1

	fld dword[ebx+GLVertex.pc+offs_Z] ;st0 = v.pc.Z

	fmulp

	fmul dword[eax+GLContext.viewport+GLViewport.scale+offs_Z]

	fadd dword[eax+GLContext.viewport+GLViewport.trans+offs_Z]

	fistp dword[ebx+GLVertex.zp+ZBufferPoint.z] ;v.zp.z = st0, st0 = st1

	; color

	cmp dword[eax+GLContext.lighting_enabled],0 ;if (context.lighting_enabled)

	je @f

		lea ecx,[ebx+GLVertex.zp+ZBufferPoint.b]

		push ecx

		add ecx,ZBufferPoint.g-ZBufferPoint.b

		push ecx

		add ecx,ZBufferPoint.r-ZBufferPoint.g

		push ecx

		stdcall RGBFtoRGBI, dword[ebx+GLVertex.color],dword[ebx+GLVertex.color+4],dword[ebx+GLVertex.color+8]

		jmp .end_if

align 4

	@@:

		; no need to convert to integer if no lighting : take current color

		mov ecx,[eax+GLContext.longcurrent_color]

		mov dword[ebx+GLVertex.zp+ZBufferPoint.r],ecx

		mov ecx,[eax+GLContext.longcurrent_color+4]

		mov dword[ebx+GLVertex.zp+ZBufferPoint.g],ecx

		mov ecx,[eax+GLContext.longcurrent_color+8]

		mov dword[ebx+GLVertex.zp+ZBufferPoint.b],ecx

	.end_if:

	; texture

	cmp dword[eax+GLContext.texture_2d_enabled],0

	je @f

		mov eax,[eax+GLContext.current_texture] ;eax = &context.current_texture

		mov eax,[eax] ;eax = context.current_texture

		;[eax+offs_text_images] = im = &context.current_texture.images[0]

		fild dword[eax+offs_text_images+offs_imag_s_bound]

		fmul dword[ebx+GLVertex.tex_coord+offs_X]

		fistp dword[ebx+GLVertex.zp+ZBufferPoint.s]

		;v.zp.s=(int)(v.tex_coord.X * im.s_bound)

		fild dword[eax+offs_text_images+offs_imag_t_bound]

		fmul dword[ebx+GLVertex.tex_coord+offs_Y]

		fistp dword[ebx+GLVertex.zp+ZBufferPoint.t]

		;v.zp.t=(int)(v.tex_coord.Y * im.t_bound)

	@@:

	ret

endp

align 16

proc gl_add_select1 uses eax ebx ecx, context:dword, z1:dword,z2:dword,z3:dword

	mov eax,[z1]

	mov ebx,eax

	cmp [z2],eax

	jge @f

		mov eax,[z2]

	@@:

	cmp [z3],eax

	jge @f

		mov eax,[z3]

	@@:

	cmp [z2],ebx

	jle @f

		mov ebx,[z2]

	@@:

	cmp [z3],ebx

	jle @f

		mov ebx,[z3]

	@@:

	mov ecx,0xffffffff

	sub ecx,ebx

	push ecx

	mov ecx,0xffffffff

	sub ecx,eax

	push ecx

	stdcall gl_add_select, [context] ;,0xffffffff-eax,0xffffffff-ebx

	ret

endp

; point

align 16

proc gl_draw_point uses eax ebx, context:dword, p0:dword

	mov ebx,[p0]

	cmp dword[ebx+GLVertex.clip_code],0 ;if (p0.clip_code == 0)

	jne @f

	mov eax,[context]

	cmp dword[eax+GLContext.render_mode],GL_SELECT

	jne .els

		stdcall gl_add_select, eax,dword[ebx+GLVertex.zp+ZBufferPoint.z],dword[ebx+GLVertex.zp+ZBufferPoint.z] ;p0.zp.z,p0.zp.z

		jmp @f

align 4

	.els:

		add ebx,GLVertex.zp

		stdcall ZB_plot, dword[eax+GLContext.zb],ebx

	@@:

	ret

endp

; line

;input:

;q - регистр с адресом вершины для интерполяции

;p0 - регистр с адресом 1-й вершины

;p1 - регистр с адресом 2-й вершины

;t - float

macro interpolate q, p0, p1, t

{

	fld dword[t]

	; интерполяция по координатам

	fld dword[p1+GLVertex.pc]

	fsub dword[p0+GLVertex.pc]

	fmul st0,st1

	fadd dword[p0+GLVertex.pc]

	fstp dword[q+GLVertex.pc] ;q.pc.X = p0.pc.X + (p1.pc.X - p0.pc.X) * t

	fld dword[p1+GLVertex.pc+offs_Y]

	fsub dword[p0+GLVertex.pc+offs_Y]

	fmul st0,st1

	fadd dword[p0+GLVertex.pc+offs_Y]

	fstp dword[q+GLVertex.pc+offs_Y]

	fld dword[p1+GLVertex.pc+offs_Z]

	fsub dword[p0+GLVertex.pc+offs_Z]

	fmul st0,st1

	fadd dword[p0+GLVertex.pc+offs_Z]

	fstp dword[q+GLVertex.pc+offs_Z]

	fld dword[p1+GLVertex.pc+offs_W]

	fsub dword[p0+GLVertex.pc+offs_W]

	fmul st0,st1

	fadd dword[p0+GLVertex.pc+offs_W]

	fstp dword[q+GLVertex.pc+offs_W]

	; интерполяция по цвету

	fld dword[p1+GLVertex.color]

	fsub dword[p0+GLVertex.color]

	fmul st0,st1

	fadd dword[p0+GLVertex.color]

	fstp dword[q+GLVertex.color]

	fld dword[p1+GLVertex.color+4]

	fsub dword[p0+GLVertex.color+4]

	fmul st0,st1

	fadd dword[p0+GLVertex.color+4]

	fstp dword[q+GLVertex.color+4]

	fld dword[p1+GLVertex.color+8]

	fsub dword[p0+GLVertex.color+8]

	fmulp

	fadd dword[p0+GLVertex.color+8]

	fstp dword[q+GLVertex.color+8]

}

;

; Line Clipping

;

; Line Clipping algorithm from 'Computer Graphics', Principles and

; Practice

; tmin,tmax -> &float

align 16

proc ClipLine1 uses ebx, denom:dword,num:dword,tmin:dword,tmax:dword

	fld dword[denom]

	ftst

	fstsw ax

	sahf

	jbe .els_0 ;if (denom>0)

		fld dword[num]

		fxch st1

		fdivp ;t=num/denom

		mov ebx,[tmax]

		fcom dword[ebx]

		fstsw ax

		sahf

		ja .r0_f1 ;if (t>*tmax) return 0

		mov ebx,[tmin]

		fcom dword[ebx]

		fstsw ax

		sahf

		jbe .r1_f1 ;if (t>*tmin) *tmin=t

			fstp dword[ebx]

		jmp .r1

align 4

	.els_0: ;else if (denom<0)

		jae .els_1

		fld dword[num]

		fxch st1

		fdivp ;t=num/denom

		mov ebx,[tmin]

		fcom dword[ebx]

		fstsw ax

		sahf

		jb .r0_f1 ;if (t<*tmin) return 0

		mov ebx,[tmax]

		fcom dword[ebx]

		fstsw ax

		sahf

		jae .r1_f1

			fstp dword[ebx] ;if (t<*tmin) *tmax=t

		jmp .r1

align 4

	.els_1: ;else if (num>0)

		ffree st0 ;denom

		fincstp

		fld dword[num]

		ftst

		fstsw ax

		sahf

		ja .r0_f1 ;if (num>0) return 0

		jmp .r1_f1

align 4

	.r0_f1: ;return 0 & free st0

		ffree st0

		fincstp

	.r0: ;return 0

		xor eax,eax

		jmp .end_f

align 4

	.r1_f1: ;return 1 & free st0

		ffree st0

		fincstp

	.r1: ;return 1

		xor eax,eax

		inc eax

	.end_f:

	ret

endp

align 16

proc gl_draw_line, context:dword, p1:dword, p2:dword

locals

	d_x dd ?

	d_y dd ?

	d_z dd ?

	d_w dd ?

	x1 dd ?

	y1 dd ?

	z1 dd ?

	w1 dd ?

	q1 GLVertex ?

	q2 GLVertex ?

	tmin dd ? ;ebp-8

	tmax dd ? ;ebp-4

endl

pushad

	mov edx,[context]

	mov edi,[p1]

	mov esi,[p2]

	cmp dword[edi+GLVertex.clip_code],0

	jne .els_i

	cmp dword[esi+GLVertex.clip_code],0

	jne .els_i

		;if ( (p1.clip_code | p2.clip_code) == 0)

		cmp dword[edx+GLContext.render_mode],GL_SELECT ;if (context.render_mode == GL_SELECT)

		jne .els_1

			stdcall gl_add_select1, edx,dword[edi+GLVertex.zp+ZBufferPoint.z],\

				dword[esi+GLVertex.zp+ZBufferPoint.z],dword[esi+GLVertex.zp+ZBufferPoint.z]

			jmp .end_f

align 4

		.els_1:

			add edi,GLVertex.zp

			add esi,GLVertex.zp

			push esi

			push edi

			push dword[edx+GLContext.zb]

			cmp dword[edx+GLContext.depth_test],0

			je .els_2

				;if (context.depth_test)

				call ZB_line_z ;, dword[edx+GLContext.zb],edi,esi

				jmp .end_f

align 4

			.els_2:

				call ZB_line ;, dword[edx+GLContext.zb],edi,esi

				jmp .end_f

align 4

	.els_i:

		;else if ( (p1.clip_code & p2.clip_code) != 0 )

		mov eax,[edi+GLVertex.clip_code]

		and eax,[esi+GLVertex.clip_code]

		or eax,eax

		jnz .end_f

	.els_0:

	fld dword[esi+GLVertex.pc+offs_X]

	fsub dword[edi+GLVertex.pc+offs_X]

	fstp dword[d_x] ;d_x = p2.pc.X - p1.pc.X

	fld dword[esi+GLVertex.pc+offs_Y]

	fsub dword[edi+GLVertex.pc+offs_Y]

	fstp dword[d_y] ;d_y = p2.pc.Y - p1.pc.Y

	fld dword[esi+GLVertex.pc+offs_Z]

	fsub dword[edi+GLVertex.pc+offs_Z]

	fstp dword[d_z] ;d_z = p2.pc.Z - p1.pc.Z

	fld dword[esi+GLVertex.pc+offs_W]

	fsub dword[edi+GLVertex.pc+offs_W]

	fstp dword[d_w] ;d_w = p2.pc.W - p1.pc.W

	mov eax,[edi+GLVertex.pc+offs_X]

	mov [x1],eax ;x1 = p1.pc.X

	mov eax,[edi+GLVertex.pc+offs_Y]

	mov [y1],eax ;y1 = p1.pc.Y

	mov eax,[edi+GLVertex.pc+offs_Z]

	mov [z1],eax ;z1 = p1.pc.Z

	mov eax,[edi+GLVertex.pc+offs_W]

	mov [w1],eax ;w1 = p1.pc.W

	mov dword[tmin],0.0

	mov dword[tmax],1.0

	lea eax,[ebp-4]

	push eax ;толкаем в стек адрес &tmax

	sub eax,4

	push eax ;толкаем в стек адрес &tmin

	fld dword[x1]

	fadd dword[w1]

	fchs

	fstp dword[esp-4]

	fld dword[d_x]

	fadd dword[d_w]

	fstp dword[esp-8]

	sub esp,8

	call ClipLine1 ;d_x+d_w,-x1-w1,&tmin,&tmax

	bt eax,0

	jnc .end_f

	sub esp,8 ;толкаем в стек адреса переменных &tmin и &tmax

	fld dword[x1]

	fsub dword[w1]

	fstp dword[esp-4]

	fld dword[d_w]

	fsub dword[d_x]

	fstp dword[esp-8]

	sub esp,8

	call ClipLine1 ;-d_x+d_w,x1-w1,&tmin,&tmax

	bt eax,0

	jnc .end_f

	sub esp,8 ;толкаем в стек адреса переменных &tmin и &tmax

	fld dword[y1]

	fadd dword[w1]

	fchs

	fstp dword[esp-4]

	fld dword[d_y]

	fadd dword[d_w]

	fstp dword[esp-8]

	sub esp,8

	call ClipLine1 ;d_y+d_w,-y1-w1,&tmin,&tmax

	bt eax,0

	jnc .end_f

	sub esp,8 ;толкаем в стек адреса переменных &tmin и &tmax

	fld dword[y1]

	fsub dword[w1]

	fstp dword[esp-4]

	fld dword[d_w]

	fsub dword[d_y]

	fstp dword[esp-8]

	sub esp,8

	call ClipLine1 ;-d_y+d_w,y1-w1,&tmin,&tmax

	bt eax,0

	jnc .end_f

	sub esp,8 ;толкаем в стек адреса переменных &tmin и &tmax

	fld dword[z1]

	fadd dword[w1]

	fchs

	fstp dword[esp-4]

	fld dword[d_z]

	fadd dword[d_w]

	fstp dword[esp-8]

	sub esp,8

	call ClipLine1 ;d_z+d_w,-z1-w1,&tmin,&tmax

	bt eax,0

	jnc .end_f

	sub esp,8 ;толкаем в стек адреса переменных &tmin и &tmax

	fld dword[z1]

	fsub dword[w1]

	fstp dword[esp-4]

	fld dword[d_w]

	fsub dword[d_z]

	fstp dword[esp-8]

	sub esp,8

	call ClipLine1 ;-d_z+d_w,z1-w1,&tmin,&tmax

	bt eax,0

	jnc .end_f

	lea eax,[ebp-8-2*sizeof.GLVertex] ;eax = &q1

	interpolate eax,edi,esi,tmin

	stdcall gl_transform_to_viewport, edx,eax

	add eax,sizeof.GLVertex ;eax = &q2

	interpolate eax,edi,esi,tmax

	stdcall gl_transform_to_viewport, edx,eax

	sub eax,sizeof.GLVertex ;eax = &q1

	lea ebx,[eax+GLVertex.zp+ZBufferPoint.b]

	push ebx

	add ebx,ZBufferPoint.g-ZBufferPoint.b

	push ebx

	add ebx,ZBufferPoint.r-ZBufferPoint.g

	push ebx

	stdcall RGBFtoRGBI, dword[eax+GLVertex.color],dword[eax+GLVertex.color+4],dword[eax+GLVertex.color+8]

	add eax,sizeof.GLVertex ;eax = &q2

	lea ebx,[eax+GLVertex.zp+ZBufferPoint.b]

	push ebx

	add ebx,ZBufferPoint.g-ZBufferPoint.b

	push ebx

	add ebx,ZBufferPoint.r-ZBufferPoint.g

	push ebx

	stdcall RGBFtoRGBI, dword[eax+GLVertex.color],dword[eax+GLVertex.color+4],dword[eax+GLVertex.color+8]

	add eax,GLVertex.zp ;eax = &q2.zp

	push eax

	sub eax,sizeof.GLVertex ;eax = &q1.zp

	push eax

	push dword[edx+GLContext.zb]

	cmp dword[edx+GLContext.depth_test],0

	je .els_3

		call ZB_line_z ;(context.zb,&q1.zp,&q2.zp)

		jmp .end_f

align 4

	.els_3:

		call ZB_line ;(context.zb,&q1.zp,&q2.zp)

	.end_f:

popad

	ret

endp

; triangle

;

; Clipping

;

; We clip the segment [a,b] against the 6 planes of the normal volume.

; We compute the point 'c' of intersection and the value of the parameter 't'

; of the intersection if x=a+t(b-a).

;

; sign: 0 -> '-', 1 -> '+'

macro clip_func sign,dir,dir1,dir2

{

locals

	t dd ?

	d_X dd ?

	d_Y dd ?

	d_Z dd ?

	d_W dd ?

endl

	mov edx,[a]

	mov ebx,[b]

	mov ecx,[c]

	fld dword[ebx+offs_X]

	fsub dword[edx+offs_X]

	fstp dword[d_X] ;d_X = (b.X - a.X)

	fld dword[ebx+offs_Y]

	fsub dword[edx+offs_Y]

	fstp dword[d_Y] ;d_Y = (b.Y - a.Y)

	fld dword[ebx+offs_Z]

	fsub dword[edx+offs_Z]

	fstp dword[d_Z] ;d_Z = (b.Z - a.Z)

	fld dword[ebx+offs_W]

	fsub dword[edx+offs_W]

	fst dword[d_W] ;d_W = (b.W - a.W)

if sign eq 0

	fadd dword[d#dir]

else

	fsub dword[d#dir]

end if

	ftst

	fstsw ax

	sahf

	jne @f

		fldz

		fst dword[t] ;t=0

		jmp .e_zero

align 4

	@@: ;else

		fld dword[edx+offs#dir]

if sign eq 0

		fchs

end if

		fsub dword[edx+offs_W]

		fdiv st0,st1

		fst dword[t] ;t = ( sign a.dir - a.W) / den

	.e_zero:

	fmul dword[d#dir1] ;st0 = t * d.dir1

	fadd dword[edx+offs#dir1]

	fstp dword[ecx+offs#dir1] ;c.dir1 = a.dir1 + t * d.dir1

	ffree st0

	fincstp

	fld dword[t]

	fmul dword[d#dir2] ;st0 = t * d.dir2

	fadd dword[edx+offs#dir2]

	fstp dword[ecx+offs#dir2] ;c.dir2 = a.dir2 + t * d.dir2

	fld dword[t]

	fmul dword[d_W]

	fadd dword[edx+offs_W]

	fst dword[ecx+offs_W] ;c.W = a.W + t * d_W

if sign eq 0

		fchs

end if

	fstp dword[ecx+offs#dir] ;c.dir = sign c.W

	mov eax,[t]

}

align 16

proc clip_xmin uses ebx ecx edx, c:dword, a:dword, b:dword

	clip_func 0,_X,_Y,_Z

	ret

endp

align 16

proc clip_xmax uses ebx ecx edx, c:dword, a:dword, b:dword

	clip_func 1,_X,_Y,_Z

	ret

endp

align 16

proc clip_ymin uses ebx ecx edx, c:dword, a:dword, b:dword

	clip_func 0,_Y,_X,_Z

	ret

endp

align 16

proc clip_ymax uses ebx ecx edx, c:dword, a:dword, b:dword

	clip_func 1,_Y,_X,_Z

	ret

endp

align 16

proc clip_zmin uses ebx ecx edx, c:dword, a:dword, b:dword

	clip_func 0,_Z,_X,_Y

	ret

endp

align 16

proc clip_zmax uses ebx ecx edx, c:dword, a:dword, b:dword

	clip_func 1,_Z,_X,_Y

	ret

endp

align 4

clip_proc dd clip_xmin,clip_xmax, clip_ymin,clip_ymax, clip_zmin,clip_zmax

;input:

;edi - q

align 16

proc updateTmp uses eax ecx edx, context:dword, p0:dword, p1:dword, t:dword

	mov edx,[context]

	mov eax,[p0]

	cmp dword[edx+GLContext.current_shade_model],GL_SMOOTH ;if (context.current_shade_model == GL_SMOOTH)

	jne .els_0

		mov ecx,[p1]

		fld dword[ecx+GLVertex.color]

		fsub dword[eax+GLVertex.color]

		fmul dword[t]

		fadd dword[eax+GLVertex.color]

		fstp dword[edi+GLVertex.color] ;q.color.v[0]=p0.color.v[0] + (p1.color.v[0]-p0.color.v[0])*t

		fld dword[ecx+GLVertex.color+4]

		fsub dword[eax+GLVertex.color+4]

		fmul dword[t]

		fadd dword[eax+GLVertex.color+4]

		fstp dword[edi+GLVertex.color+4] ;q.color.v[1]=p0.color.v[1] + (p1.color.v[1]-p0.color.v[1])*t

		fld dword[ecx+GLVertex.color+8]

		fsub dword[eax+GLVertex.color+8]

		fmul dword[t]

		fadd dword[eax+GLVertex.color+8]

		fstp dword[edi+GLVertex.color+8] ;q.color.v[2]=p0.color.v[2] + (p1.color.v[2]-p0.color.v[2])*t

		jmp @f

align 4

	.els_0:

		mov ecx,[eax+GLVertex.color]

		mov [edi+GLVertex.color],ecx ;q.color.v[0]=p0.color.v[0]

		mov ecx,[eax+GLVertex.color+4]

		mov [edi+GLVertex.color+4],ecx ;q.color.v[1]=p0.color.v[1]

		mov ecx,[eax+GLVertex.color+8]

		mov [edi+GLVertex.color+8],ecx ;q.color.v[2]=p0.color.v[2]

	@@:

	cmp dword[edx+GLContext.texture_2d_enabled],0 ;if (context.texture_2d_enabled)

	je @f

		mov ecx,[p1]

		fld dword[ecx+GLVertex.tex_coord+offs_X]

		fsub dword[eax+GLVertex.tex_coord+offs_X]

		fmul dword[t]

		fadd dword[eax+GLVertex.tex_coord+offs_X]

		fstp dword[edi+GLVertex.tex_coord+offs_X] ;q.tex_coord.X=p0.tex_coord.X + (p1.tex_coord.X-p0.tex_coord.X)*t

		fld dword[ecx+GLVertex.tex_coord+offs_Y]

		fsub dword[eax+GLVertex.tex_coord+offs_Y]

		fmul dword[t]

		fadd dword[eax+GLVertex.tex_coord+offs_Y]

		fstp dword[edi+GLVertex.tex_coord+offs_Y] ;q.tex_coord.Y=p0.tex_coord.Y + (p1.tex_coord.Y-p0.tex_coord.Y)*t

	@@:

	stdcall gl_clipcode, [edi+GLVertex.pc+offs_X],[edi+GLVertex.pc+offs_Y],\

		[edi+GLVertex.pc+offs_Z],[edi+GLVertex.pc+offs_W]

	mov dword[edi+GLVertex.clip_code],eax

	or eax,eax ;if (q.clip_code==0)

	jnz @f

		stdcall gl_transform_to_viewport,[context],edi

		lea eax,[edi+GLVertex.zp+ZBufferPoint.b]

		push eax

		add eax,ZBufferPoint.g-ZBufferPoint.b

		push eax

		add eax,ZBufferPoint.r-ZBufferPoint.g

		push eax

		stdcall RGBFtoRGBI, dword[edi+GLVertex.color],dword[edi+GLVertex.color+4],dword[edi+GLVertex.color+8]

	@@:

	ret

endp

align 16

proc gl_draw_triangle, context:dword, p0:dword, p1:dword, p2:dword

locals

	cc rd 3

	front dd ?

	norm dd ? ;float

endl

pushad

	mov ebx,[p0]

	mov ecx,[p1]

	mov edx,[p2]

	mov edi,[ebx+GLVertex.clip_code]

	mov dword[cc],edi

	mov eax,[ecx+GLVertex.clip_code]

	mov dword[cc+4],eax

	or edi,eax

	mov eax,[edx+GLVertex.clip_code]

	mov dword[cc+8],eax

	or edi,eax ;co = cc[0] | cc[1] | cc[2]

	; we handle the non clipped case here to go faster

	;or edi,___ - было выше

	jnz .els_0

		;if (co==0)

		mov edi,dword[edx+GLVertex.zp+ZBufferPoint.x]

		sub edi,dword[ebx+GLVertex.zp+ZBufferPoint.x]

		mov dword[norm],edi ;p2.x-p0.x

		fild dword[norm]

		mov edi,dword[ecx+GLVertex.zp+ZBufferPoint.y]

		sub edi,dword[ebx+GLVertex.zp+ZBufferPoint.y]

		mov dword[norm],edi ;p1.y-p0.y

		fimul dword[norm]

		fchs

		mov edi,dword[ecx+GLVertex.zp+ZBufferPoint.x]

		sub edi,dword[ebx+GLVertex.zp+ZBufferPoint.x]

		mov dword[norm],edi ;p1.x-p0.x

		fild dword[norm]

		mov edi,dword[edx+GLVertex.zp+ZBufferPoint.y]

		sub edi,dword[ebx+GLVertex.zp+ZBufferPoint.y]

		mov dword[norm],edi ;p2.y-p0.y

		fimul dword[norm]

		faddp

		;st0 = (p1.zp.x-p0.zp.x)*(p2.zp.y-p0.zp.y) - (p2.zp.x-p0.zp.x)*(p1.zp.y-p0.zp.y)

		mov dword[front],0

		ftst

		fstsw ax

		ffree st0

		fincstp

		sahf

		je .end_f

		jae @f

			inc dword[front] ;front = norm < 0.0

		@@:

		mov edi,[context]

		mov eax,dword[edi+GLContext.current_front_face]

		xor dword[front],eax ;front ^= context.current_front_face

		; back face culling

		cmp dword[edi+GLContext.cull_face_enabled],0

		je .els_1

			; most used case first

			cmp dword[edi+GLContext.current_cull_face],GL_BACK

			jne @f

				cmp dword[front],0

				je .end_f

					stdcall dword[edi+GLContext.draw_triangle_front], edi,ebx,ecx,edx

				jmp .end_f

align 4

			@@:

			cmp dword[edi+GLContext.current_cull_face],GL_FRONT

			jne .end_f

				cmp dword[front],0

				jne .end_f

					stdcall dword[edi+GLContext.draw_triangle_back], edi,ebx,ecx,edx

			jmp .end_f

align 4

		.els_1:

			; no culling

			cmp dword[front],0

			je @f

				stdcall dword[edi+GLContext.draw_triangle_front], edi,ebx,ecx,edx

				jmp .end_f

align 4

			@@:

				stdcall dword[edi+GLContext.draw_triangle_back], edi,ebx,ecx,edx

		jmp .end_f

align 4

	.els_0:

		;eax = cc[2]

		and eax,[cc]

		and eax,[cc+4] ;eax = c_and = cc[0] & cc[1] & cc[2]

		or eax,eax ;if (c_and==0)

		jnz .end_f

			stdcall gl_draw_triangle_clip, [context],ebx,ecx,edx,0

	.end_f:

popad

	ret

endp

align 16

proc gl_draw_triangle_clip, context:dword, p0:dword, p1:dword, p2:dword, clip_bit:dword

locals

	co dd ?

	cc rd 3

	edge_flag_tmp dd ?

	clip_mask dd ?

	q rd 3 ;GLVertex*

	tmp1 GLVertex ?

	tmp2 GLVertex ?

endl

pushad

	mov ebx,[p0]

	mov ecx,[p1]

	mov edx,[p2]

	mov edi,[ebx+GLVertex.clip_code]

	mov [cc],edi

	mov eax,[ecx+GLVertex.clip_code]

	mov [cc+4],eax

	or edi,eax

	mov eax,[edx+GLVertex.clip_code]

	mov [cc+8],eax

	or edi,eax

	mov [co],edi ;co = cc[0] | cc[1] | cc[2]

	or edi,edi ;if (co == 0)

	jnz .els_0

		stdcall gl_draw_triangle, [context],ebx,ecx,edx

		jmp .end_f

align 4

	.els_0:

		;eax = cc[2]

		and eax,[cc]

		and eax,[cc+4] ;c_and = cc[0] & cc[1] & cc[2]

		; the triangle is completely outside

		or eax,eax ;if (c_and!=0) return

		jnz .end_f

		; find the next direction to clip

		.cycle_0: ;while (clip_bit < 6 && (co & (1 << clip_bit)) == 0)

		cmp dword[clip_bit],6

		jge .cycle_0_end

		xor eax,eax

		inc eax

		mov ecx,[clip_bit]

		shl eax,cl

		and eax,[co]

		or eax,eax

		jnz .cycle_0_end

			inc dword[clip_bit]

			jmp .cycle_0

align 4

		.cycle_0_end:

	; this test can be true only in case of rounding errors

	cmp dword[clip_bit],6

if 0

	jne @f

;      printf("Error:\n");

;      printf("%f %f %f %f\n",p0->pc.X,p0->pc.Y,p0->pc.Z,p0->pc.W);

;      printf("%f %f %f %f\n",p1->pc.X,p1->pc.Y,p1->pc.Z,p1->pc.W);

;      printf("%f %f %f %f\n",p2->pc.X,p2->pc.Y,p2->pc.Z,p2->pc.W);

		jmp .end_f

	@@:

end if

if 1

	je .end_f

end if

	xor eax,eax

	inc eax

	mov ecx,[clip_bit]

	shl eax,cl

	mov [clip_mask],eax ;1 << clip_bit

	mov edi,[cc]

	xor edi,[cc+4]

	xor edi,[cc+8]

	and eax,edi ;eax = co1 = (cc[0] ^ cc[1] ^ cc[2]) & clip_mask

	mov ecx,[p1] ;востанавливаем после shl ___,cl

	or eax,eax ;if (co1)

	jz .els_1

		; one point outside

		mov eax,[cc]

		and eax,[clip_mask]

		or eax,eax ;if (cc[0] & clip_mask)

		jz .els_2

			;q[0]=p0 q[1]=p1 q[2]=p2

			mov [q],ebx

			mov [q+4],ecx

			mov [q+8],edx

			jmp .els_2_end

align 4

		.els_2:

		mov eax,[cc+4]

		and eax,[clip_mask]

		or eax,eax ;else if (cc[1] & clip_mask)

		jz .els_3

			;q[0]=p1 q[1]=p2 q[2]=p0

			mov [q],ecx

			mov [q+4],edx

			mov [q+8],ebx

			jmp .els_2_end

align 4

		.els_3:

			;q[0]=p2 q[1]=p0 q[2]=p1

			mov [q],edx

			mov [q+4],ebx

			mov [q+8],ecx

		.els_2_end:

		mov ebx,[q]

		add ebx,GLVertex.pc

		mov ecx,[q+4]

		add ecx,GLVertex.pc

		mov edx,[q+8]

		add edx,GLVertex.pc

		lea eax,[clip_proc]

		mov edi,[clip_bit]

		lea eax,[eax+4*edi]

		lea edi,[ebp-(2*sizeof.GLVertex)+GLVertex.pc]

		stdcall dword[eax],edi,ebx,ecx ;clip_proc[clip_bit](&tmp1.pc,&q[0].pc,&q[1].pc)

		sub edi,GLVertex.pc

		sub ebx,GLVertex.pc

		sub ecx,GLVertex.pc

		stdcall updateTmp,[context],ebx,ecx,eax ;(c,&tmp1,q[0],q[1],tt)

		add ebx,GLVertex.pc

		lea eax,[clip_proc]

		mov edi,[clip_bit]

		lea eax,[eax+4*edi]

		lea edi,[ebp-sizeof.GLVertex+GLVertex.pc]

		stdcall dword[eax],edi,ebx,edx ;clip_proc[clip_bit](&tmp2.pc,&q[0].pc,&q[2].pc)

		sub edi,GLVertex.pc

		sub ebx,GLVertex.pc

		sub edx,GLVertex.pc

		stdcall updateTmp,[context],ebx,edx,eax ;(c,&tmp2,q[0],q[2],tt)

		mov eax,[ebx+GLVertex.edge_flag]

		mov [tmp1.edge_flag],eax ;q[0].edge_flag

		mov eax,[edx+GLVertex.edge_flag]

		mov [edge_flag_tmp],eax	;q[2].edge_flag

		mov dword[edx+GLVertex.edge_flag],0 ;q[2].edge_flag=0

		mov eax,[clip_bit]

		inc eax

		push eax ;для вызова нижней функции

		lea edi,[ebp-2*sizeof.GLVertex]

		stdcall gl_draw_triangle_clip,[context],edi,ecx,edx,eax ;gl_draw_triangle_clip(c,&tmp1,q[1],q[2],clip_bit+1)

		mov dword[tmp2.edge_flag],0

		mov dword[tmp1.edge_flag],0

		mov eax,[edge_flag_tmp]

		mov [edx+GLVertex.edge_flag],eax ;q[2].edge_flag=edge_flag_tmp

		push edx

		push edi

		add edi,sizeof.GLVertex ;edi = &tmp2

		stdcall gl_draw_triangle_clip,[context],edi ;gl_draw_triangle_clip(c,&tmp2,&tmp1,q[2],clip_bit+1)

		jmp .end_f

align 4

	.els_1:

		; two points outside

		mov eax,[cc]

		and eax,[clip_mask]

		cmp eax,0 ;if (cc[0] & clip_mask)==0

		jne .els_4

			;q[0]=p0 q[1]=p1 q[2]=p2

			mov [q],ebx

			mov [q+4],ecx

			mov [q+8],edx

			jmp .els_4_end

align 4

		.els_4:

		mov eax,[cc+4]

		and eax,[clip_mask]

		cmp eax,0 ;else if (cc[1] & clip_mask)==0

		jne .els_5

			;q[0]=p1 q[1]=p2 q[2]=p0

			mov [q],ecx

			mov [q+4],edx

			mov [q+8],ebx

			jmp .els_4_end

align 4

		.els_5:

			;q[0]=p2 q[1]=p0 q[2]=p1

			mov [q],edx

			mov [q+4],ebx

			mov [q+8],ecx

		.els_4_end:

		mov ebx,[q]

		add ebx,GLVertex.pc

		mov ecx,[q+4]

		add ecx,GLVertex.pc

		mov edx,[q+8]

		add edx,GLVertex.pc

		lea eax,[clip_proc]

		mov edi,[clip_bit]

		lea eax,[eax+4*edi]

		lea edi,[ebp-(2*sizeof.GLVertex)+GLVertex.pc]

		stdcall dword[eax],edi,ebx,ecx ;clip_proc[clip_bit](&tmp1.pc,&q[0].pc,&q[1].pc)

		sub edi,GLVertex.pc

		stdcall updateTmp,[context],[q],[q+4],eax

		lea eax,[clip_proc]

		mov edi,[clip_bit]

		lea eax,[eax+4*edi]

		lea edi,[ebp-sizeof.GLVertex+GLVertex.pc]

		stdcall dword[eax],edi,ebx,edx ;clip_proc[clip_bit](&tmp2.pc,&q[0].pc,&q[2].pc)

		sub edi,GLVertex.pc

		stdcall updateTmp,[context],[q],[q+8],eax

		mov dword[tmp1.edge_flag],1

		mov eax,[edx+GLVertex.edge_flag-GLVertex.pc]

		mov dword[tmp2.edge_flag],eax ;tmp2.edge_flag = q[2].edge_flag

		mov eax,[clip_bit]

		inc eax

		push eax

		push edi

		sub edi,sizeof.GLVertex

		stdcall gl_draw_triangle_clip,[context],[q],edi ;gl_draw_triangle_clip(c,q[0],&tmp1,&tmp2,clip_bit+1)

	.end_f:

popad

	ret

endp

align 16

proc gl_draw_triangle_select uses eax, context:dword, p0:dword,p1:dword,p2:dword

	mov eax,[p2]

	push dword[eax+GLVertex.zp+offs_Z]

	mov eax,[p1]

	push dword[eax+GLVertex.zp+offs_Z]

	mov eax,[p0]

	push dword[eax+GLVertex.zp+offs_Z]

	stdcall gl_add_select1, [context] ;,p0.zp.z, p1.zp.z, p2.zp.z

	ret

endp

if PROFILE eq 1

	count_triangles dd ?

	count_triangles_textured dd ?

	count_pixels dd ?

end if

align 16

proc gl_draw_triangle_fill, context:dword, p0:dword,p1:dword,p2:dword

pushad

if PROFILE eq 1

;    int norm;

;    assert(p0->zp.x >= 0 && p0->zp.x < c->zb->xsize);

;    assert(p0->zp.y >= 0 && p0->zp.y < c->zb->ysize);

;    assert(p1->zp.x >= 0 && p1->zp.x < c->zb->xsize);

;    assert(p1->zp.y >= 0 && p1->zp.y < c->zb->ysize);

;    assert(p2->zp.x >= 0 && p2->zp.x < c->zb->xsize);

;    assert(p2->zp.y >= 0 && p2->zp.y < c->zb->ysize);

;    norm=(p1->zp.x-p0->zp.x)*(p2->zp.y-p0->zp.y)-

;      (p2->zp.x-p0->zp.x)*(p1->zp.y-p0->zp.y);

;    count_pixels+=abs(norm)/2;

	inc dword[count_triangles]

end if

	mov ebx,[p1]

	add ebx,GLVertex.zp

	mov ecx,[p2]

	add ecx,GLVertex.zp

	mov edx,[context]

	cmp dword[edx+GLContext.texture_2d_enabled],0

	je .els_i

		;if (context.texture_2d_enabled)

if PROFILE eq 1

	inc dword[count_triangles_textured]

end if

		mov eax,[edx+GLContext.current_texture]

		mov eax,[eax] ;переход по указателю

		;так как offs_text_images+offs_imag_pixmap = 0 то context.current_texture.images[0].pixmap = [eax]

		stdcall ZB_setTexture, [edx+GLContext.zb], [eax],\

			[eax+offs_imag_s_bound],[eax+offs_imag_t_bound],[eax+offs_imag_xsize_log2]

		mov eax,[p0]

		add eax,GLVertex.zp

		push ecx

		push ebx

		push eax

		push dword[edx+GLContext.zb]

		cmp dword[edx+GLContext.matrix_model_projection_no_w_transform],0

		je @f

			call ZB_fillTriangleMappingPerspective

			jmp .end_f

align 4

		@@:

			call ZB_fillTriangleMapping

		jmp .end_f

align 4

	.els_i:

		mov eax,[p0]

		add eax,GLVertex.zp

		cmp dword[edx+GLContext.current_shade_model],GL_SMOOTH

		jne .els

			;else if (context.current_shade_model == GL_SMOOTH)

			stdcall ZB_fillTriangleSmooth, dword[edx+GLContext.zb],eax,ebx,ecx

			jmp .end_f

align 4

		.els: