; 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)
offs_X equ 0
offs_Y equ 4
offs_Z equ 8
offs_W equ 12
align 4
proc gl_transform_to_viewport uses eax ebx ecx, context:dword,v:dword
locals
point dd ?
endl
mov eax,[context]
mov ebx,[v]
; coordinates
fld1
fdiv dword[ebx+offs_vert_pc+offs_W] ;st0 = 1/v.pc.W
fld dword[ebx+offs_vert_pc+offs_X] ;st0 = v.pc.X
fmul st0,st1
fmul dword[eax+offs_cont_viewport+offs_vpor_scale+offs_X]
fadd dword[eax+offs_cont_viewport+offs_vpor_trans+offs_X]
fistp dword[ebx+offs_vert_zp] ;v.zp.x = st0, st0 = st1
fld dword[ebx+offs_vert_pc+offs_Y] ;st0 = v.pc.Y
fmul st0,st1
fmul dword[eax+offs_cont_viewport+offs_vpor_scale+offs_Y]
fadd dword[eax+offs_cont_viewport+offs_vpor_trans+offs_Y]
fistp dword[ebx+offs_vert_zp+offs_zbup_y] ;v.zp.y = st0, st0 = st1
fld dword[ebx+offs_vert_pc+offs_Z] ;st0 = v.pc.Z
fmul st0,st1
fmul dword[eax+offs_cont_viewport+offs_vpor_scale+offs_Z]
fadd dword[eax+offs_cont_viewport+offs_vpor_trans+offs_Z]
fistp dword[ebx+offs_vert_zp+offs_zbup_z] ;v.zp.z = st0, st0 = st1
ffree st0
fincstp
; color
cmp dword[eax+offs_cont_lighting_enabled],0 ;if (context.lighting_enabled)
je @f
mov ecx,ebx
add ecx,offs_vert_zp+offs_zbup_b
push ecx
add ecx,offs_zbup_g-offs_zbup_b
push ecx
add ecx,offs_zbup_r-offs_zbup_g
push ecx
stdcall RGBFtoRGBI, dword[ebx+offs_vert_color],dword[ebx+offs_vert_color+4],dword[ebx+offs_vert_color+8]
jmp .end_if
@@:
; no need to convert to integer if no lighting : take current color
mov ecx,[eax+offs_cont_longcurrent_color]
mov dword[ebx+offs_vert_zp+offs_zbup_r],ecx
mov ecx,[eax+offs_cont_longcurrent_color+4]
mov dword[ebx+offs_vert_zp+offs_zbup_g],ecx
mov ecx,[eax+offs_cont_longcurrent_color+8]
mov dword[ebx+offs_vert_zp+offs_zbup_b],ecx
.end_if:
; texture
bt dword[eax+offs_cont_texture_2d_enabled],0
jnc @f
mov dword[point],dword(ZB_POINT_S_MAX - ZB_POINT_S_MIN)
fild dword[point]
fmul dword[ebx+offs_vert_tex_coord] ;st0 *= v.tex_coord.X
fistp dword[ebx+offs_vert_zp+offs_zbup_s]
add dword[ebx+offs_vert_zp+offs_zbup_s],ZB_POINT_S_MIN
mov dword[point],dword(ZB_POINT_T_MAX - ZB_POINT_T_MIN)
fild dword[point]
fmul dword[ebx+offs_vert_tex_coord+4] ;st0 *= v.tex_coord.Y
fistp dword[ebx+offs_vert_zp+offs_zbup_t]
add dword[ebx+offs_vert_zp+offs_zbup_s],ZB_POINT_T_MIN
@@:
if DEBUG ;gl_transform_to_viewport
push edi
mov ecx,80
mov eax,[ebx+offs_vert_zp]
lea edi,[buf_param]
stdcall convert_int_to_str,ecx
stdcall str_n_cat,edi,txt_zp_sp,2
stdcall str_len,edi
add edi,eax
sub ecx,eax
mov eax,[ebx+offs_vert_zp+offs_zbup_y]
stdcall convert_int_to_str,ecx
stdcall str_n_cat,edi,txt_zp_sp,2
stdcall str_len,edi
add edi,eax
sub ecx,eax
mov eax,[ebx+offs_vert_zp+offs_zbup_z]
stdcall convert_int_to_str,ecx
stdcall str_n_cat,edi,txt_nl,2
stdcall dbg_print,f_ttv,buf_param
pop edi
end if
ret
endp
align 4
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 4
proc gl_draw_point uses eax ebx, context:dword, p0:dword
mov ebx,[p0]
cmp dword[ebx+offs_vert_clip_code],0 ;if (p0.clip_code == 0)
jne @f
mov eax,[context]
cmp dword[eax+offs_cont_render_mode],GL_SELECT
jne .els
stdcall gl_add_select, eax,dword[ebx+offs_vert_zp+offs_zbup_z],dword[ebx+offs_vert_zp+offs_zbup_z] ;p0.zp.z,p0.zp.z
jmp @f
.els:
add ebx,offs_vert_zp
stdcall ZB_plot, dword[eax+offs_cont_zb],ebx
@@:
ret
endp
; line
align 4
proc interpolate uses eax ebx ecx, q:dword,p0:dword,p1:dword,t:dword
mov eax,[q]
mov ebx,[p0]
mov ecx,[p1]
fld dword[t]
; интерполяция по координатам
fld dword[ecx+offs_vert_pc+offs_X]
fsub dword[ebx+offs_vert_pc+offs_X]
fmul st0,st1
fadd dword[ebx+offs_vert_pc+offs_X]
fstp dword[eax+offs_vert_pc+offs_X]
fld dword[ecx+offs_vert_pc+offs_Y]
fsub dword[ebx+offs_vert_pc+offs_Y]
fmul st0,st1
fadd dword[ebx+offs_vert_pc+offs_Y]
fstp dword[eax+offs_vert_pc+offs_Y]
fld dword[ecx+offs_vert_pc+offs_Z]
fsub dword[ebx+offs_vert_pc+offs_Z]
fmul st0,st1
fadd dword[ebx+offs_vert_pc+offs_Z]
fstp dword[eax+offs_vert_pc+offs_Z]
fld dword[ecx+offs_vert_pc+offs_W]
fsub dword[ebx+offs_vert_pc+offs_W]
fmul st0,st1
fadd dword[ebx+offs_vert_pc+offs_W]
fstp dword[eax+offs_vert_pc+offs_W]
; интерполяция по цвету
fld dword[ecx+offs_vert_color]
fsub dword[ebx+offs_vert_color]
fmul st0,st1
fadd dword[ebx+offs_vert_color]
fstp dword[eax+offs_vert_color]
fld dword[ecx+offs_vert_color+4]
fsub dword[ebx+offs_vert_color+4]
fmul st0,st1
fadd dword[ebx+offs_vert_color+4]
fstp dword[eax+offs_vert_color+4]
fld dword[ecx+offs_vert_color+8]
fsub dword[ebx+offs_vert_color+8]
fmul st0,st1
fadd dword[ebx+offs_vert_color+8]
fstp dword[eax+offs_vert_color+8]
ffree st0
fincstp
ret
endp
;
; Line Clipping
;
; Line Clipping algorithm from 'Computer Graphics', Principles and
; Practice
; tmin,tmax -> &float
align 4
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
.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
.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
.r0_f1: ;return 0 & free st0
ffree st0
fincstp
.r0: ;return 0
xor eax,eax
jmp .end_f
.r1_f1: ;return 1 & free st0
ffree st0
fincstp
.r1: ;return 1
xor eax,eax
inc eax
.end_f:
ret
endp
align 4
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+offs_vert_clip_code],0
jne .els_i
cmp dword[esi+offs_vert_clip_code],0
jne .els_i
;if ( (p1.clip_code | p2.clip_code) == 0)
cmp dword[edx+offs_cont_render_mode],GL_SELECT ;if (context.render_mode == GL_SELECT)
jne .els_1
stdcall gl_add_select1, edx,dword[edi+offs_vert_zp+offs_zbup_z],\
dword[esi+offs_vert_zp+offs_zbup_z],dword[esi+offs_vert_zp+offs_zbup_z]
jmp .end_f
.els_1:
add edi,offs_vert_zp
add esi,offs_vert_zp
push esi
push edi
push dword[edx+offs_cont_zb]
cmp dword[edx+offs_cont_depth_test],0
je .els_2
;if (context.depth_test)
call ZB_line_z ;, dword[edx+offs_cont_zb],edi,esi
jmp .end_f
.els_2:
call ZB_line ;, dword[edx+offs_cont_zb],edi,esi
jmp .end_f
.els_i:
;else if ( (p1.clip_code & p2.clip_code) != 0 )
mov eax,[edi+offs_vert_clip_code]
and eax,[esi+offs_vert_clip_code]
cmp eax,0
jne .end_f
.els_0:
fld dword[esi+offs_vert_pc+offs_X]
fsub dword[edi+offs_vert_pc+offs_X]
fstp dword[d_x] ;d_x = p2.pc.X - p1.pc.X
fld dword[esi+offs_vert_pc+offs_Y]
fsub dword[edi+offs_vert_pc+offs_Y]
fstp dword[d_y] ;d_y = p2.pc.Y - p1.pc.Y
fld dword[esi+offs_vert_pc+offs_Z]
fsub dword[edi+offs_vert_pc+offs_Z]
fstp dword[d_z] ;d_z = p2.pc.Z - p1.pc.Z
fld dword[esi+offs_vert_pc+offs_W]
fsub dword[edi+offs_vert_pc+offs_W]
fstp dword[d_w] ;d_w = p2.pc.W - p1.pc.W
mov eax,[edi+offs_vert_pc+offs_X]
mov [x1],eax ;x1 = p1.pc.X
mov eax,[edi+offs_vert_pc+offs_Y]
mov [y1],eax ;y1 = p1.pc.Y
mov eax,[edi+offs_vert_pc+offs_Z]
mov [z1],eax ;z1 = p1.pc.Z
mov eax,[edi+offs_vert_pc+offs_W]
mov [w1],eax ;w1 = p1.pc.W
mov dword[tmin],0.0
mov dword[tmax],1.0
mov eax,ebp
sub eax,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
mov eax,ebp
sub eax,8+2*sizeof.GLVertex ;eax = &q1
stdcall interpolate, eax,edi,esi,[tmin]
stdcall gl_transform_to_viewport, edx,eax
add eax,sizeof.GLVertex ;eax = &q2
stdcall interpolate, eax,edi,esi,[tmax]
stdcall gl_transform_to_viewport, edx,eax
sub eax,sizeof.GLVertex ;eax = &q1
mov ebx,eax
add ebx,offs_vert_zp+offs_zbup_b
push ebx
add ebx,offs_zbup_g-offs_zbup_b
push ebx
add ebx,offs_zbup_r-offs_zbup_g
push ebx
stdcall RGBFtoRGBI, dword[eax+offs_vert_color],dword[eax+offs_vert_color+4],dword[eax+offs_vert_color+8]
add eax,sizeof.GLVertex ;eax = &q2
mov ebx,eax
add ebx,offs_vert_zp+offs_zbup_b
push ebx
add ebx,offs_zbup_g-offs_zbup_b
push ebx
add ebx,offs_zbup_r-offs_zbup_g
push ebx
stdcall RGBFtoRGBI, dword[eax+offs_vert_color],dword[eax+offs_vert_color+4],dword[eax+offs_vert_color+8]
add eax,offs_vert_zp ;eax = &q2.zp
push eax
sub eax,sizeof.GLVertex ;eax = &q1.zp
push eax
push dword[edx+offs_cont_zb]
cmp dword[edx+offs_cont_depth_test],0
je .els_3
call ZB_line_z ;(context.zb,&q1.zp,&q2.zp)
jmp .end_f
.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
@@: ;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 4
proc clip_xmin uses ebx ecx edx, c:dword, a:dword, b:dword
clip_func 0,_X,_Y,_Z
ret
endp
align 4
proc clip_xmax uses ebx ecx edx, c:dword, a:dword, b:dword
clip_func 1,_X,_Y,_Z
ret
endp
align 4
proc clip_ymin uses ebx ecx edx, c:dword, a:dword, b:dword
clip_func 0,_Y,_X,_Z
ret
endp
align 4
proc clip_ymax uses ebx ecx edx, c:dword, a:dword, b:dword
clip_func 1,_Y,_X,_Z
ret
endp
align 4
proc clip_zmin uses ebx ecx edx, c:dword, a:dword, b:dword
clip_func 0,_Z,_X,_Y
ret
endp
align 4
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
align 4
proc updateTmp uses eax ebx ecx edx, context:dword, q:dword, p0:dword, p1:dword, t:dword
mov ebx,[q]
mov edx,[context]
mov eax,[p0]
cmp dword[edx+offs_cont_current_shade_model],GL_SMOOTH ;if (context.current_shade_model == GL_SMOOTH)
jne .els_0
mov ecx,[p1]
fld dword[ecx+offs_vert_color]
fsub dword[eax+offs_vert_color]
fmul dword[t]
fadd dword[eax+offs_vert_color]
fstp dword[ebx+offs_vert_color] ;q.color.v[0]=p0.color.v[0] + (p1.color.v[0]-p0.color.v[0])*t
fld dword[ecx+offs_vert_color+4]
fsub dword[eax+offs_vert_color+4]
fmul dword[t]
fadd dword[eax+offs_vert_color+4]
fstp dword[ebx+offs_vert_color+4] ;q.color.v[1]=p0.color.v[1] + (p1.color.v[1]-p0.color.v[1])*t
fld dword[ecx+offs_vert_color+8]
fsub dword[eax+offs_vert_color+8]
fmul dword[t]
fadd dword[eax+offs_vert_color+8]
fstp dword[ebx+offs_vert_color+8] ;q.color.v[2]=p0.color.v[2] + (p1.color.v[2]-p0.color.v[2])*t
jmp @f
.els_0:
mov ecx,[eax+offs_vert_color]
mov [ebx+offs_vert_color],ecx ;q.color.v[0]=p0.color.v[0]
mov ecx,[eax+offs_vert_color+4]
mov [ebx+offs_vert_color+4],ecx ;q.color.v[1]=p0.color.v[1]
mov ecx,[eax+offs_vert_color+8]
mov [ebx+offs_vert_color+8],ecx ;q.color.v[2]=p0.color.v[2]
@@:
cmp dword[edx+offs_cont_texture_2d_enabled],0 ;if (context.texture_2d_enabled)
je @f
mov ecx,[p1]
fld dword[ecx+offs_vert_tex_coord+offs_X]
fsub dword[eax+offs_vert_tex_coord+offs_X]
fmul dword[t]
fadd dword[eax+offs_vert_tex_coord+offs_X]
fstp dword[ebx+offs_vert_tex_coord+offs_X] ;q.tex_coord.X=p0.tex_coord.X + (p1.tex_coord.X-p0.tex_coord.X)*t
fld dword[ecx+offs_vert_tex_coord+offs_Y]
fsub dword[eax+offs_vert_tex_coord+offs_Y]
fmul dword[t]
fadd dword[eax+offs_vert_tex_coord+offs_Y]
fstp dword[ebx+offs_vert_tex_coord+offs_Y] ;q.tex_coord.Y=p0.tex_coord.Y + (p1.tex_coord.Y-p0.tex_coord.Y)*t
@@:
stdcall gl_clipcode, [ebx+offs_vert_pc+offs_X],[ebx+offs_vert_pc+offs_Y],\
[ebx+offs_vert_pc+offs_Z],[ebx+offs_vert_pc+offs_W]
mov dword[ebx+offs_vert_clip_code],eax
cmp eax,0 ;if (q.clip_code==0)
jne @f
stdcall gl_transform_to_viewport,[context],ebx
mov eax,ebx
add eax,offs_vert_zp+offs_zbup_b
push eax
add eax,offs_zbup_g-offs_zbup_b
push eax
add eax,offs_zbup_r-offs_zbup_g
push eax
stdcall RGBFtoRGBI, dword[ebx+offs_vert_color],dword[ebx+offs_vert_color+4],dword[ebx+offs_vert_color+8]
@@:
ret
endp
align 4
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+offs_vert_clip_code]
mov dword[cc],edi
mov eax,[ecx+offs_vert_clip_code]
mov dword[cc+4],eax
or edi,eax
mov eax,[edx+offs_vert_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
cmp edi,0 ;if (co==0)
jne .els_0
mov edi,dword[edx+offs_vert_zp+offs_zbup_x]
sub edi,dword[ebx+offs_vert_zp+offs_zbup_x]
mov dword[norm],edi
fild dword[norm]
mov edi,dword[ecx+offs_vert_zp+offs_zbup_y]
sub edi,dword[ebx+offs_vert_zp+offs_zbup_y]
mov dword[norm],edi
fimul dword[norm]
mov edi,dword[ecx+offs_vert_zp+offs_zbup_x]
sub edi,dword[ebx+offs_vert_zp+offs_zbup_x]
mov dword[norm],edi
fild dword[norm]
mov edi,dword[edx+offs_vert_zp+offs_zbup_y]
sub edi,dword[ebx+offs_vert_zp+offs_zbup_y]
mov dword[norm],edi
fimul dword[norm]
fsubp
;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
fldz
fcompp
fstsw ax
sahf
je .end_f
jb @f
inc dword[front] ;front = 0.0 > norm
@@:
mov edi,[context]
mov eax,dword[edi+offs_cont_current_front_face]
xor dword[front],eax ;front ^= context.current_front_face
; back face culling
cmp dword[edi+offs_cont_cull_face_enabled],0
je .els_1
; most used case first
cmp dword[edi+offs_cont_current_cull_face],GL_BACK
jne @f
cmp dword[front],0
je .end_f
stdcall dword[edi+offs_cont_draw_triangle_front], edi,ebx,ecx,edx
jmp .end_f
@@:
cmp dword[edi+offs_cont_current_cull_face],GL_FRONT
jne .end_f
cmp dword[front],0
jne .end_f
stdcall dword[edi+offs_cont_draw_triangle_back], edi,ebx,ecx,edx
jmp .end_f
.els_1:
; no culling
cmp dword[front],0
je @f
stdcall dword[edi+offs_cont_draw_triangle_front], edi,ebx,ecx,edx
jmp .end_f
@@:
stdcall dword[edi+offs_cont_draw_triangle_back], edi,ebx,ecx,edx
jmp .end_f
.els_0:
;eax = cc[2]
and eax,[cc]
and eax,[cc+4] ;eax = c_and = cc[0] & cc[1] & cc[2]
cmp eax,0 ;if (c_and==0)
jne .end_f
stdcall gl_draw_triangle_clip, [context],ebx,ecx,edx,0
.end_f:
popad
ret
endp
align 4
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+offs_vert_clip_code]
mov [cc],edi
mov eax,[ecx+offs_vert_clip_code]
mov [cc+4],eax
or edi,eax
mov eax,[edx+offs_vert_clip_code]
mov [cc+8],eax
or edi,eax
mov [co],edi ;co = cc[0] | cc[1] | cc[2]
cmp edi,0 ;if (co == 0)
jne .els_0
stdcall gl_draw_triangle, [context],ebx,ecx,edx
jmp .end_f
.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
cmp eax,0 ;if (c_and!=0) return
jne .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]
cmp eax,0
jne .cycle_0_end
inc dword[clip_bit]
jmp .cycle_0
.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
cmp eax,0 ;if (co1)
je .els_1
; one point outside
mov eax,[cc]
and eax,[clip_mask]
cmp eax,0 ;if (cc[0] & clip_mask)
je .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
.els_2:
mov eax,[cc+4]
and eax,[clip_mask]
cmp eax,0 ;else if (cc[1] & clip_mask)
je .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
.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,offs_vert_pc
mov ecx,[q+4]
add ecx,offs_vert_pc
mov edx,[q+8]
add edx,offs_vert_pc
lea eax,[clip_proc]
mov edi,[clip_bit]
shl edi,2
add eax,edi
mov edi,ebp
sub edi,(2*sizeof.GLVertex)-offs_vert_pc
stdcall dword[eax],edi,ebx,ecx ;clip_proc[clip_bit](&tmp1.pc,&q[0].pc,&q[1].pc)
sub edi,offs_vert_pc
sub ebx,offs_vert_pc
sub ecx,offs_vert_pc
stdcall updateTmp,[context],edi,ebx,ecx,eax ;updateTmp(c,&tmp1,q[0],q[1],tt)
add ebx,offs_vert_pc
lea eax,[clip_proc]
mov edi,[clip_bit]
shl edi,2
add eax,edi
mov edi,ebp
sub edi,sizeof.GLVertex-offs_vert_pc
stdcall dword[eax],edi,ebx,edx ;clip_proc[clip_bit](&tmp2.pc,&q[0].pc,&q[2].pc)
sub edi,offs_vert_pc
sub ebx,offs_vert_pc
sub edx,offs_vert_pc
stdcall updateTmp,[context],edi,ebx,edx,eax ;updateTmp(c,&tmp2,q[0],q[2],tt)
mov eax,[ebx+offs_vert_edge_flag]
mov [tmp1+offs_vert_edge_flag],eax ;q[0].edge_flag
mov eax,[edx+offs_vert_edge_flag]
mov [edge_flag_tmp],eax ;q[2].edge_flag
mov dword[edx+offs_vert_edge_flag],0 ;q[2].edge_flag=0
mov eax,[clip_bit]
inc eax
push eax ;для вызова нижней функции
mov edi,ebp
sub edi,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+offs_vert_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
.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
.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
.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,offs_vert_pc
mov ecx,[q+4]
add ecx,offs_vert_pc
mov edx,[q+8]
add edx,offs_vert_pc
lea eax,[clip_proc]
mov edi,[clip_bit]
shl edi,2
add eax,edi
mov edi,ebp
sub edi,(2*sizeof.GLVertex)-offs_vert_pc
stdcall dword[eax],edi,ebx,ecx ;clip_proc[clip_bit](&tmp1.pc,&q[0].pc,&q[1].pc)
sub edi,offs_vert_pc
stdcall updateTmp,[context],edi,[q],[q+4],eax
lea eax,[clip_proc]
mov edi,[clip_bit]
shl edi,2
add eax,edi
mov edi,ebp
sub edi,sizeof.GLVertex-offs_vert_pc
stdcall dword[eax],edi,ebx,edx ;clip_proc[clip_bit](&tmp2.pc,&q[0].pc,&q[2].pc)
sub edi,offs_vert_pc
stdcall updateTmp,[context],edi,[q],[q+8],eax
mov edx,[q+8]
mov dword[tmp1+offs_vert_edge_flag],1
mov eax,[edx+offs_vert_edge_flag]
mov dword[tmp1+offs_vert_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 4
proc gl_draw_triangle_select uses eax, context:dword, p0:dword,p1:dword,p2:dword
mov eax,[p2]
push dword[eax+offs_vert_zp+offs_Z]
mov eax,[p1]
push dword[eax+offs_vert_zp+offs_Z]
mov eax,[p0]
push dword[eax+offs_vert_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 4
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,offs_vert_zp
mov ecx,[p2]
add ecx,offs_vert_zp
mov edx,[context]
cmp dword[edx+offs_cont_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,dword[edx+offs_cont_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, dword[edx+offs_cont_zb],dword[eax]
mov eax,[p0]
add eax,offs_vert_zp
stdcall ZB_fillTriangleMappingPerspective, dword[edx+offs_cont_zb],eax,ebx,ecx
jmp .end_f
.els_i:
mov eax,[p0]
add eax,offs_vert_zp
cmp dword[edx+offs_cont_current_shade_model],GL_SMOOTH
jne .els
;else if (context.current_shade_model == GL_SMOOTH)
stdcall ZB_fillTriangleSmooth, dword[edx+offs_cont_zb],eax,ebx,ecx
jmp .end_f
.els:
stdcall ZB_fillTriangleFlat, dword[edx+offs_cont_zb],eax,ebx,ecx
.end_f:
popad
ret
endp
; Render a clipped triangle in line mode
align 4
proc gl_draw_triangle_line uses eax ebx ecx edx, context:dword, p0:dword,p1:dword,p2:dword
mov edx,[context]
cmp dword[edx+offs_cont_depth_test],0
je .els
lea ecx,[ZB_line_z]
jmp @f
.els:
lea ecx,[ZB_line]
@@:
;if (p0.edge_flag) ZB_line_z(context.zb,&p0.zp,&p1.zp)
mov eax,[p0]
cmp dword[eax+offs_vert_edge_flag],0
je @f
mov ebx,eax
add ebx,offs_vert_zp
mov eax,[p1]
add eax,offs_vert_zp
stdcall ecx,dword[edx+offs_cont_zb],ebx,eax
@@:
;if (p1.edge_flag) ZB_line_z(context.zb,&p1.zp,&p2.zp)
mov eax,[p1]
cmp dword[eax+offs_vert_edge_flag],0
je @f
mov ebx,eax
add ebx,offs_vert_zp
mov eax,[p2]
add eax,offs_vert_zp
stdcall ecx,dword[edx+offs_cont_zb],ebx,eax
@@:
;if (p2.edge_flag) ZB_line_z(context.zb,&p2.zp,&p0.zp);
mov eax,[p2]
cmp dword[eax+offs_vert_edge_flag],0
je @f
mov ebx,eax
add ebx,offs_vert_zp
mov eax,[p0]
add eax,offs_vert_zp
stdcall ecx,dword[edx+offs_cont_zb],ebx,eax
@@:
ret
endp
; Render a clipped triangle in point mode
align 4
proc gl_draw_triangle_point uses eax ebx edx, context:dword, p0:dword,p1:dword,p2:dword
mov edx,[context]
mov eax,[p0]
cmp dword[eax+offs_vert_edge_flag],0
je @f
mov ebx,eax
add ebx,offs_vert_zp
stdcall ZB_plot,dword[edx+offs_cont_zb],ebx
@@:
mov eax,[p1]
cmp dword[eax+offs_vert_edge_flag],0
je @f
mov ebx,eax
add ebx,offs_vert_zp
stdcall ZB_plot,dword[edx+offs_cont_zb],ebx
@@:
mov eax,[p2]
cmp dword[eax+offs_vert_edge_flag],0
je @f
mov ebx,eax
add ebx,offs_vert_zp
stdcall ZB_plot,dword[edx+offs_cont_zb],ebx
@@:
ret
endp