forked from KolibriOS/kolibrios
1159 lines
28 KiB
NASM
1159 lines
28 KiB
NASM
; fill triangle profile
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; #define PROFILE
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CLIP_XMIN equ (1<<0)
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CLIP_XMAX equ (1<<1)
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CLIP_YMIN equ (1<<2)
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CLIP_YMAX equ (1<<3)
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CLIP_ZMIN equ (1<<4)
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CLIP_ZMAX equ (1<<5)
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align 16
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proc gl_transform_to_viewport uses eax ebx ecx, context:dword,v:dword
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mov eax,[context]
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mov ebx,[v]
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; coordinates
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fld1
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fdiv dword[ebx+offs_vert_pc+offs_W] ;st0 = 1/v.pc.W
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fld dword[ebx+offs_vert_pc+offs_X] ;st0 = v.pc.X
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fmul st0,st1
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fmul dword[eax+GLContext.viewport+offs_vpor_scale+offs_X]
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fadd dword[eax+GLContext.viewport+offs_vpor_trans+offs_X]
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fistp dword[ebx+offs_vert_zp] ;v.zp.x = st0, st0 = st1
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fld dword[ebx+offs_vert_pc+offs_Y] ;st0 = v.pc.Y
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fmul st0,st1
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fmul dword[eax+GLContext.viewport+offs_vpor_scale+offs_Y]
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fadd dword[eax+GLContext.viewport+offs_vpor_trans+offs_Y]
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fistp dword[ebx+offs_vert_zp+offs_zbup_y] ;v.zp.y = st0, st0 = st1
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fld dword[ebx+offs_vert_pc+offs_Z] ;st0 = v.pc.Z
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fmulp
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fmul dword[eax+GLContext.viewport+offs_vpor_scale+offs_Z]
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fadd dword[eax+GLContext.viewport+offs_vpor_trans+offs_Z]
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fistp dword[ebx+offs_vert_zp+offs_zbup_z] ;v.zp.z = st0, st0 = st1
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; color
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cmp dword[eax+GLContext.lighting_enabled],0 ;if (context.lighting_enabled)
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je @f
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mov ecx,ebx
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add ecx,offs_vert_zp+offs_zbup_b
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push ecx
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add ecx,offs_zbup_g-offs_zbup_b
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push ecx
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add ecx,offs_zbup_r-offs_zbup_g
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push ecx
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stdcall RGBFtoRGBI, dword[ebx+offs_vert_color],dword[ebx+offs_vert_color+4],dword[ebx+offs_vert_color+8]
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jmp .end_if
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align 4
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@@:
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; no need to convert to integer if no lighting : take current color
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mov ecx,[eax+GLContext.longcurrent_color]
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mov dword[ebx+offs_vert_zp+offs_zbup_r],ecx
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mov ecx,[eax+GLContext.longcurrent_color+4]
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mov dword[ebx+offs_vert_zp+offs_zbup_g],ecx
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mov ecx,[eax+GLContext.longcurrent_color+8]
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mov dword[ebx+offs_vert_zp+offs_zbup_b],ecx
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.end_if:
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; texture
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cmp dword[eax+GLContext.texture_2d_enabled],0
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je @f
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mov eax,[eax+GLContext.current_texture] ;eax = &context.current_texture
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mov eax,[eax] ;eax = context.current_texture
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;[eax+offs_text_images] = im = &context.current_texture.images[0]
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fild dword[eax+offs_text_images+offs_imag_s_bound]
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fmul dword[ebx+offs_vert_tex_coord+offs_X]
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fistp dword[ebx+offs_vert_zp+offs_zbup_s]
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;v.zp.s=(int)(v.tex_coord.X * im.s_bound)
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fild dword[eax+offs_text_images+offs_imag_t_bound]
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fmul dword[ebx+offs_vert_tex_coord+offs_Y]
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fistp dword[ebx+offs_vert_zp+offs_zbup_t]
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;v.zp.t=(int)(v.tex_coord.Y * im.t_bound)
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@@:
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ret
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endp
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align 16
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proc gl_add_select1 uses eax ebx ecx, context:dword, z1:dword,z2:dword,z3:dword
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mov eax,[z1]
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mov ebx,eax
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cmp [z2],eax
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jge @f
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mov eax,[z2]
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@@:
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cmp [z3],eax
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jge @f
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mov eax,[z3]
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@@:
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cmp [z2],ebx
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jle @f
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mov ebx,[z2]
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@@:
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cmp [z3],ebx
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jle @f
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mov ebx,[z3]
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@@:
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mov ecx,0xffffffff
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sub ecx,ebx
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push ecx
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mov ecx,0xffffffff
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sub ecx,eax
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push ecx
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stdcall gl_add_select, [context] ;,0xffffffff-eax,0xffffffff-ebx
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ret
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endp
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; point
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align 16
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proc gl_draw_point uses eax ebx, context:dword, p0:dword
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mov ebx,[p0]
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cmp dword[ebx+offs_vert_clip_code],0 ;if (p0.clip_code == 0)
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jne @f
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mov eax,[context]
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cmp dword[eax+GLContext.render_mode],GL_SELECT
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jne .els
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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
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jmp @f
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align 4
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.els:
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add ebx,offs_vert_zp
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stdcall ZB_plot, dword[eax+GLContext.zb],ebx
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@@:
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ret
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endp
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; line
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;input:
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;q - регистр с адресом вершины для интерполяции
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;p0 - регистр с адресом 1-й вершины
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;p1 - регистр с адресом 2-й вершины
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;t - float
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macro interpolate q, p0, p1, t
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{
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fld dword[t]
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; интерполяция по координатам
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fld dword[p1+offs_vert_pc]
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fsub dword[p0+offs_vert_pc]
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fmul st0,st1
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fadd dword[p0+offs_vert_pc]
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fstp dword[q+offs_vert_pc] ;q.pc.X = p0.pc.X + (p1.pc.X - p0.pc.X) * t
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fld dword[p1+offs_vert_pc+offs_Y]
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fsub dword[p0+offs_vert_pc+offs_Y]
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fmul st0,st1
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fadd dword[p0+offs_vert_pc+offs_Y]
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fstp dword[q+offs_vert_pc+offs_Y]
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fld dword[p1+offs_vert_pc+offs_Z]
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fsub dword[p0+offs_vert_pc+offs_Z]
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fmul st0,st1
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fadd dword[p0+offs_vert_pc+offs_Z]
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fstp dword[q+offs_vert_pc+offs_Z]
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fld dword[p1+offs_vert_pc+offs_W]
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fsub dword[p0+offs_vert_pc+offs_W]
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fmul st0,st1
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fadd dword[p0+offs_vert_pc+offs_W]
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fstp dword[q+offs_vert_pc+offs_W]
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; интерполяция по цвету
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fld dword[p1+offs_vert_color]
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fsub dword[p0+offs_vert_color]
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fmul st0,st1
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fadd dword[p0+offs_vert_color]
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fstp dword[q+offs_vert_color]
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fld dword[p1+offs_vert_color+4]
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fsub dword[p0+offs_vert_color+4]
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fmul st0,st1
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fadd dword[p0+offs_vert_color+4]
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fstp dword[q+offs_vert_color+4]
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fld dword[p1+offs_vert_color+8]
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fsub dword[p0+offs_vert_color+8]
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fmulp
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fadd dword[p0+offs_vert_color+8]
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fstp dword[q+offs_vert_color+8]
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}
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;
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; Line Clipping
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;
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; Line Clipping algorithm from 'Computer Graphics', Principles and
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; Practice
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; tmin,tmax -> &float
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align 16
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proc ClipLine1 uses ebx, denom:dword,num:dword,tmin:dword,tmax:dword
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fld dword[denom]
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ftst
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fstsw ax
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sahf
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jbe .els_0 ;if (denom>0)
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fld dword[num]
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fxch st1
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fdivp ;t=num/denom
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mov ebx,[tmax]
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fcom dword[ebx]
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fstsw ax
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sahf
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ja .r0_f1 ;if (t>*tmax) return 0
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mov ebx,[tmin]
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fcom dword[ebx]
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fstsw ax
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sahf
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jbe .r1_f1 ;if (t>*tmin) *tmin=t
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fstp dword[ebx]
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jmp .r1
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align 4
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.els_0: ;else if (denom<0)
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jae .els_1
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fld dword[num]
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fxch st1
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fdivp ;t=num/denom
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mov ebx,[tmin]
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fcom dword[ebx]
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fstsw ax
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sahf
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jb .r0_f1 ;if (t<*tmin) return 0
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mov ebx,[tmax]
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fcom dword[ebx]
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fstsw ax
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sahf
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jae .r1_f1
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fstp dword[ebx] ;if (t<*tmin) *tmax=t
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jmp .r1
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align 4
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.els_1: ;else if (num>0)
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ffree st0 ;denom
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fincstp
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fld dword[num]
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ftst
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fstsw ax
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sahf
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ja .r0_f1 ;if (num>0) return 0
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jmp .r1_f1
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align 4
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.r0_f1: ;return 0 & free st0
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ffree st0
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fincstp
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.r0: ;return 0
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xor eax,eax
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jmp .end_f
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align 4
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.r1_f1: ;return 1 & free st0
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ffree st0
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fincstp
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.r1: ;return 1
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xor eax,eax
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inc eax
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.end_f:
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ret
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endp
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align 16
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proc gl_draw_line, context:dword, p1:dword, p2:dword
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locals
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d_x dd ?
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d_y dd ?
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d_z dd ?
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d_w dd ?
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x1 dd ?
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y1 dd ?
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z1 dd ?
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w1 dd ?
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q1 GLVertex ?
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q2 GLVertex ?
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tmin dd ? ;ebp-8
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tmax dd ? ;ebp-4
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endl
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pushad
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mov edx,[context]
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mov edi,[p1]
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mov esi,[p2]
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cmp dword[edi+offs_vert_clip_code],0
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jne .els_i
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cmp dword[esi+offs_vert_clip_code],0
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jne .els_i
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;if ( (p1.clip_code | p2.clip_code) == 0)
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cmp dword[edx+GLContext.render_mode],GL_SELECT ;if (context.render_mode == GL_SELECT)
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jne .els_1
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stdcall gl_add_select1, edx,dword[edi+offs_vert_zp+offs_zbup_z],\
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dword[esi+offs_vert_zp+offs_zbup_z],dword[esi+offs_vert_zp+offs_zbup_z]
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jmp .end_f
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align 4
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.els_1:
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add edi,offs_vert_zp
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add esi,offs_vert_zp
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push esi
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push edi
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push dword[edx+GLContext.zb]
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cmp dword[edx+GLContext.depth_test],0
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je .els_2
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;if (context.depth_test)
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call ZB_line_z ;, dword[edx+GLContext.zb],edi,esi
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jmp .end_f
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align 4
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.els_2:
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call ZB_line ;, dword[edx+GLContext.zb],edi,esi
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jmp .end_f
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align 4
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.els_i:
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;else if ( (p1.clip_code & p2.clip_code) != 0 )
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mov eax,[edi+offs_vert_clip_code]
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and eax,[esi+offs_vert_clip_code]
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or eax,eax
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jnz .end_f
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.els_0:
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fld dword[esi+offs_vert_pc+offs_X]
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fsub dword[edi+offs_vert_pc+offs_X]
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fstp dword[d_x] ;d_x = p2.pc.X - p1.pc.X
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fld dword[esi+offs_vert_pc+offs_Y]
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fsub dword[edi+offs_vert_pc+offs_Y]
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fstp dword[d_y] ;d_y = p2.pc.Y - p1.pc.Y
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fld dword[esi+offs_vert_pc+offs_Z]
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fsub dword[edi+offs_vert_pc+offs_Z]
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fstp dword[d_z] ;d_z = p2.pc.Z - p1.pc.Z
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fld dword[esi+offs_vert_pc+offs_W]
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fsub dword[edi+offs_vert_pc+offs_W]
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fstp dword[d_w] ;d_w = p2.pc.W - p1.pc.W
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mov eax,[edi+offs_vert_pc+offs_X]
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mov [x1],eax ;x1 = p1.pc.X
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mov eax,[edi+offs_vert_pc+offs_Y]
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mov [y1],eax ;y1 = p1.pc.Y
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mov eax,[edi+offs_vert_pc+offs_Z]
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mov [z1],eax ;z1 = p1.pc.Z
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mov eax,[edi+offs_vert_pc+offs_W]
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mov [w1],eax ;w1 = p1.pc.W
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mov dword[tmin],0.0
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mov dword[tmax],1.0
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mov eax,ebp
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sub eax,4
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push eax ;толкаем в стек адрес &tmax
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sub eax,4
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push eax ;толкаем в стек адрес &tmin
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fld dword[x1]
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fadd dword[w1]
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fchs
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fstp dword[esp-4]
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fld dword[d_x]
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fadd dword[d_w]
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fstp dword[esp-8]
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sub esp,8
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call ClipLine1 ;d_x+d_w,-x1-w1,&tmin,&tmax
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bt eax,0
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jnc .end_f
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sub esp,8 ;толкаем в стек адреса переменных &tmin и &tmax
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fld dword[x1]
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fsub dword[w1]
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fstp dword[esp-4]
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fld dword[d_w]
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fsub dword[d_x]
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fstp dword[esp-8]
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sub esp,8
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call ClipLine1 ;-d_x+d_w,x1-w1,&tmin,&tmax
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bt eax,0
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jnc .end_f
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sub esp,8 ;толкаем в стек адреса переменных &tmin и &tmax
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fld dword[y1]
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fadd dword[w1]
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fchs
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fstp dword[esp-4]
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fld dword[d_y]
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fadd dword[d_w]
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fstp dword[esp-8]
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sub esp,8
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call ClipLine1 ;d_y+d_w,-y1-w1,&tmin,&tmax
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bt eax,0
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jnc .end_f
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sub esp,8 ;толкаем в стек адреса переменных &tmin и &tmax
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fld dword[y1]
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fsub dword[w1]
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fstp dword[esp-4]
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fld dword[d_w]
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fsub dword[d_y]
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fstp dword[esp-8]
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sub esp,8
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call ClipLine1 ;-d_y+d_w,y1-w1,&tmin,&tmax
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bt eax,0
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jnc .end_f
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sub esp,8 ;толкаем в стек адреса переменных &tmin и &tmax
|
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fld dword[z1]
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fadd dword[w1]
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fchs
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fstp dword[esp-4]
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fld dword[d_z]
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fadd dword[d_w]
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fstp dword[esp-8]
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sub esp,8
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call ClipLine1 ;d_z+d_w,-z1-w1,&tmin,&tmax
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bt eax,0
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jnc .end_f
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sub esp,8 ;толкаем в стек адреса переменных &tmin и &tmax
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fld dword[z1]
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fsub dword[w1]
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fstp dword[esp-4]
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fld dword[d_w]
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fsub dword[d_z]
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fstp dword[esp-8]
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sub esp,8
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call ClipLine1 ;-d_z+d_w,z1-w1,&tmin,&tmax
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bt eax,0
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jnc .end_f
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mov eax,ebp
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sub eax,8+2*sizeof.GLVertex ;eax = &q1
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interpolate eax,edi,esi,tmin
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stdcall gl_transform_to_viewport, edx,eax
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add eax,sizeof.GLVertex ;eax = &q2
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interpolate eax,edi,esi,tmax
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stdcall gl_transform_to_viewport, edx,eax
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sub eax,sizeof.GLVertex ;eax = &q1
|
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mov ebx,eax
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add ebx,offs_vert_zp+offs_zbup_b
|
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push ebx
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add ebx,offs_zbup_g-offs_zbup_b
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push ebx
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add ebx,offs_zbup_r-offs_zbup_g
|
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push ebx
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stdcall RGBFtoRGBI, dword[eax+offs_vert_color],dword[eax+offs_vert_color+4],dword[eax+offs_vert_color+8]
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|
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add eax,sizeof.GLVertex ;eax = &q2
|
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mov ebx,eax
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add ebx,offs_vert_zp+offs_zbup_b
|
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push ebx
|
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add ebx,offs_zbup_g-offs_zbup_b
|
||
push ebx
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add ebx,offs_zbup_r-offs_zbup_g
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push ebx
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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+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+offs_vert_color]
|
||
fsub dword[eax+offs_vert_color]
|
||
fmul dword[t]
|
||
fadd dword[eax+offs_vert_color]
|
||
fstp dword[edi+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[edi+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[edi+offs_vert_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+offs_vert_color]
|
||
mov [edi+offs_vert_color],ecx ;q.color.v[0]=p0.color.v[0]
|
||
mov ecx,[eax+offs_vert_color+4]
|
||
mov [edi+offs_vert_color+4],ecx ;q.color.v[1]=p0.color.v[1]
|
||
mov ecx,[eax+offs_vert_color+8]
|
||
mov [edi+offs_vert_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+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[edi+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[edi+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, [edi+offs_vert_pc+offs_X],[edi+offs_vert_pc+offs_Y],\
|
||
[edi+offs_vert_pc+offs_Z],[edi+offs_vert_pc+offs_W]
|
||
mov dword[edi+offs_vert_clip_code],eax
|
||
or eax,eax ;if (q.clip_code==0)
|
||
jnz @f
|
||
stdcall gl_transform_to_viewport,[context],edi
|
||
mov eax,edi
|
||
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[edi+offs_vert_color],dword[edi+offs_vert_color+4],dword[edi+offs_vert_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+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
|
||
;or edi,___ - было выше
|
||
jnz .els_0
|
||
;if (co==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 ;p2.x-p0.x
|
||
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 ;p1.y-p0.y
|
||
fimul dword[norm]
|
||
fchs
|
||
mov edi,dword[ecx+offs_vert_zp+offs_zbup_x]
|
||
sub edi,dword[ebx+offs_vert_zp+offs_zbup_x]
|
||
mov dword[norm],edi ;p1.x-p0.x
|
||
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 ;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+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]
|
||
|
||
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,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],ebx,ecx,eax ;(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],ebx,edx,eax ;(c,&tmp2,q[0],q[2],tt)
|
||
|
||
mov eax,[ebx+offs_vert_edge_flag]
|
||
mov [tmp1.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
|
||
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,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],[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],[q],[q+8],eax
|
||
|
||
mov dword[tmp1.edge_flag],1
|
||
mov eax,[edx+offs_vert_edge_flag-offs_vert_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+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 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,offs_vert_zp
|
||
mov ecx,[p2]
|
||
add ecx,offs_vert_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,offs_vert_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,offs_vert_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:
|
||
stdcall ZB_fillTriangleFlat, dword[edx+GLContext.zb],eax,ebx,ecx
|
||
.end_f:
|
||
popad
|
||
ret
|
||
endp
|
||
|
||
; Render a clipped triangle in line mode
|
||
|
||
align 16
|
||
proc gl_draw_triangle_line uses eax ebx ecx edx, context:dword, p0:dword,p1:dword,p2:dword
|
||
mov edx,[context]
|
||
cmp dword[edx+GLContext.depth_test],0
|
||
je .els
|
||
lea ecx,[ZB_line_z]
|
||
jmp @f
|
||
align 4
|
||
.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+GLContext.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+GLContext.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+GLContext.zb],ebx,eax
|
||
@@:
|
||
|
||
ret
|
||
endp
|
||
|
||
; Render a clipped triangle in point mode
|
||
align 16
|
||
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+GLContext.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+GLContext.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+GLContext.zb],ebx
|
||
@@:
|
||
ret
|
||
endp
|
||
|
||
|
||
|
||
|