forked from KolibriOS/kolibrios
924 lines
22 KiB
NASM
924 lines
22 KiB
NASM
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; 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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offs_X equ 0
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offs_Y equ 4
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offs_Z equ 8
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offs_W equ 12
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align 4
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proc gl_transform_to_viewport uses eax ebx ecx, context:dword,v:dword
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locals
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point dd ?
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endl
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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+offs_cont_viewport+offs_vpor_scale+offs_X]
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fadd dword[eax+offs_cont_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+offs_cont_viewport+offs_vpor_scale+offs_Y]
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fadd dword[eax+offs_cont_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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fmul st0,st1
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fmul dword[eax+offs_cont_viewport+offs_vpor_scale+offs_Z]
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fadd dword[eax+offs_cont_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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bt dword[eax+offs_cont_lighting_enabled],0
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jnc @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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@@:
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; no need to convert to integer if no lighting : take current color
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push ecx
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mov ecx,[eax+offs_cont_longcurrent_color]
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mov dword[ebx+offs_vert_zp+offs_zbup_r],ecx
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mov ecx,[eax+offs_cont_longcurrent_color+4]
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mov dword[ebx+offs_vert_zp+offs_zbup_g],ecx
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mov ecx,[eax+offs_cont_longcurrent_color+8]
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mov dword[ebx+offs_vert_zp+offs_zbup_b],ecx
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pop ecx
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.end_if:
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; texture
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bt dword[eax+offs_cont_texture_2d_enabled],0
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jnc @f
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mov dword[point],dword(ZB_POINT_S_MAX - ZB_POINT_S_MIN)
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fild dword[point]
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fmul dword[ebx+offs_vert_tex_coord] ;st0 *= v.tex_coord.X
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fistp dword[ebx+offs_vert_zp+offs_zbup_s]
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add dword[ebx+offs_vert_zp+offs_zbup_s],ZB_POINT_S_MIN
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mov dword[point],dword(ZB_POINT_T_MAX - ZB_POINT_T_MIN)
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fild dword[point]
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fmul dword[ebx+offs_vert_tex_coord+4] ;st0 *= v.tex_coord.Y
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fistp dword[ebx+offs_vert_zp+offs_zbup_t]
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add dword[ebx+offs_vert_zp+offs_zbup_s],ZB_POINT_T_MIN
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@@:
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if DEBUG ;gl_transform_to_viewport
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push edi
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mov ecx,80
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mov eax,[ebx+offs_vert_zp]
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lea edi,[buf_param]
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stdcall convert_int_to_str,ecx
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stdcall str_n_cat,edi,txt_zp_sp,2
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stdcall str_len,edi
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add edi,eax
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sub ecx,eax
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mov eax,[ebx+offs_vert_zp+offs_zbup_y]
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stdcall convert_int_to_str,ecx
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stdcall str_n_cat,edi,txt_zp_sp,2
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stdcall str_len,edi
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add edi,eax
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sub ecx,eax
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mov eax,[ebx+offs_vert_zp+offs_zbup_z]
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stdcall convert_int_to_str,ecx
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stdcall str_n_cat,edi,txt_nl,2
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stdcall dbg_print,f_ttv,buf_param
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pop edi
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end if
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ret
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endp
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align 4
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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 4
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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+offs_cont_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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.els:
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add ebx,offs_vert_zp
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stdcall ZB_plot, dword[eax+offs_cont_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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align 4
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proc interpolate uses eax ebx ecx, q:dword,p0:dword,p1:dword,t:dword
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mov eax,[q]
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mov ebx,[p0]
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mov ecx,[p1]
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fld dword[t]
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; интерполяция по координатам
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fld dword[ecx+offs_vert_pc]
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fsub dword[ebx+offs_vert_pc]
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fmul st0,st1
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fadd dword[ebx+offs_vert_pc]
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fstp dword[eax+offs_vert_pc]
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fld dword[ecx+offs_vert_pc+4]
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fsub dword[ebx+offs_vert_pc+4]
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fmul st0,st1
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fadd dword[ebx+offs_vert_pc+4]
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fstp dword[eax+offs_vert_pc+4]
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fld dword[ecx+offs_vert_pc+8]
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fsub dword[ebx+offs_vert_pc+8]
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fmul st0,st1
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fadd dword[ebx+offs_vert_pc+8]
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fstp dword[eax+offs_vert_pc+8]
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fld dword[ecx+offs_vert_pc+12]
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fsub dword[ebx+offs_vert_pc+12]
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fmul st0,st1
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fadd dword[ebx+offs_vert_pc+12]
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fstp dword[eax+offs_vert_pc+12]
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; интерполяция по цвету
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fld dword[ecx+offs_vert_color]
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fsub dword[ebx+offs_vert_color]
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fmul st0,st1
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fadd dword[ebx+offs_vert_color]
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fstp dword[eax+offs_vert_color]
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fld dword[ecx+offs_vert_color+4]
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fsub dword[ebx+offs_vert_color+4]
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fmul st0,st1
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fadd dword[ebx+offs_vert_color+4]
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fstp dword[eax+offs_vert_color+4]
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fld dword[ecx+offs_vert_color+8]
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fsub dword[ebx+offs_vert_color+8]
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fmul st0,st1
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fadd dword[ebx+offs_vert_color+8]
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fstp dword[eax+offs_vert_color+8]
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ret
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endp
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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 4
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proc ClipLine1 uses ebx, denom:dword,num:dword,tmin:dword,tmax:dword
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fldz
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fcom dword[denom]
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fstsw ax
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sahf
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je .u2
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jmp @f
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.u2:
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fcom dword[num]
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fstsw ax
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sahf
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jb .r0 ;if (denom==0 && num>0) return 0
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jmp .r1
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@@:
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fcom dword[denom]
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fstsw ax
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sahf
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ja .els_0 ;if (0<denom)
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fld dword[num]
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fdiv dword[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 ;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
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fstp dword[ebx] ;if (t>*tmin) *tmin=t
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jmp .r1
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.els_0: ;else if (0>denom)
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fld dword[num]
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fdiv dword[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 ;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
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fstp dword[ebx] ;if (t<*tmin) *tmax=t
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jmp .r1
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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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.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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if DEBUG ;ClipLine1
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push edi
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mov ecx,80
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lea edi,[buf_param]
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stdcall convert_int_to_str,ecx
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stdcall str_n_cat,edi,txt_nl,2
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stdcall dbg_print,f_cl1,buf_param
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pop edi
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end if
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ffree st0 ;профилактика для очистки стека
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fincstp ;как минимум одно значение в стеке уже есть
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ret
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endp
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align 4
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proc gl_draw_line uses eax ebx edx edi esi, 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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mov edx,[context]
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mov edi,[p1]
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mov esi,[p2]
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if DEBUG
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jmp @f
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f_1 db ' gl_draw_line',0
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@@:
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stdcall dbg_print,f_1,m_1
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end if
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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+offs_cont_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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.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+offs_cont_zb]
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cmp dword[edx+offs_cont_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+offs_cont_zb],edi,esi
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jmp .end_f
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.els_2:
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call ZB_line ;, dword[edx+offs_cont_zb],edi,esi
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jmp .end_f
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.els_i:
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;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:
|
||
|
|
if DEBUG
|
||
|
|
stdcall dbg_print,f_1,m_2
|
||
|
|
end if
|
||
|
|
|
||
|
|
finit
|
||
|
|
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:
|
||
|
|
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]
|
||
|
|
fsub dword[edx]
|
||
|
|
fstp dword[d_X] ;d_X = (b.X - a.X)
|
||
|
|
fld dword[ebx+4]
|
||
|
|
fsub dword[edx+4]
|
||
|
|
fstp dword[d_Y] ;d_Y = (b.Y - a.Y)
|
||
|
|
fld dword[ebx+8]
|
||
|
|
fsub dword[edx+8]
|
||
|
|
fstp dword[d_Z] ;d_Z = (b.Z - a.Z)
|
||
|
|
fld dword[ebx+12]
|
||
|
|
fsub dword[edx+12]
|
||
|
|
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
|
||
|
|
|
||
|
|
fldz
|
||
|
|
fcomp st1
|
||
|
|
fstsw ax
|
||
|
|
sahf
|
||
|
|
ja @f
|
||
|
|
fincstp
|
||
|
|
fst dword[t] ;t=0
|
||
|
|
jmp .e_zero
|
||
|
|
@@: ;else
|
||
|
|
fincstp
|
||
|
|
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
|
||
|
|
|
||
|
|
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
|
||
|
|
|
||
|
|
;static inline void updateTmp(GLContext *c, GLVertex *q,GLVertex *p0,GLVertex *p1,float t)
|
||
|
|
;{
|
||
|
|
; if (c->current_shade_model == GL_SMOOTH) {
|
||
|
|
; q->color.v[0]=p0->color.v[0] + (p1->color.v[0]-p0->color.v[0])*t;
|
||
|
|
; q->color.v[1]=p0->color.v[1] + (p1->color.v[1]-p0->color.v[1])*t;
|
||
|
|
; q->color.v[2]=p0->color.v[2] + (p1->color.v[2]-p0->color.v[2])*t;
|
||
|
|
; } else {
|
||
|
|
; q->color.v[0]=p0->color.v[0];
|
||
|
|
; q->color.v[1]=p0->color.v[1];
|
||
|
|
; q->color.v[2]=p0->color.v[2];
|
||
|
|
; }
|
||
|
|
|
||
|
|
; if (c->texture_2d_enabled) {
|
||
|
|
; q->tex_coord.X=p0->tex_coord.X + (p1->tex_coord.X-p0->tex_coord.X)*t;
|
||
|
|
; q->tex_coord.Y=p0->tex_coord.Y + (p1->tex_coord.Y-p0->tex_coord.Y)*t;
|
||
|
|
; }
|
||
|
|
|
||
|
|
; q->clip_code=gl_clipcode(q->pc.X,q->pc.Y,q->pc.Z,q->pc.W);
|
||
|
|
; if (q->clip_code==0){
|
||
|
|
; gl_transform_to_viewport(c,q);
|
||
|
|
; RGBFtoRGBI(q->color.v[0],q->color.v[1],q->color.v[2],q->zp.r,q->zp.g,q->zp.b);
|
||
|
|
; }
|
||
|
|
;}
|
||
|
|
|
||
|
|
;static void gl_draw_triangle_clip(GLContext *c, GLVertex *p0,GLVertex *p1,GLVertex *p2,int clip_bit);
|
||
|
|
|
||
|
|
;void gl_draw_triangle(GLContext *c, GLVertex *p0,GLVertex *p1,GLVertex *p2)
|
||
|
|
;{
|
||
|
|
; int co,c_and,cc[3],front;
|
||
|
|
; float norm;
|
||
|
|
;
|
||
|
|
; cc[0]=p0->clip_code;
|
||
|
|
; cc[1]=p1->clip_code;
|
||
|
|
; cc[2]=p2->clip_code;
|
||
|
|
;
|
||
|
|
; co=cc[0] | cc[1] | cc[2];
|
||
|
|
;
|
||
|
|
; /* we handle the non clipped case here to go faster */
|
||
|
|
; if (co==0) {
|
||
|
|
;
|
||
|
|
; norm=(float)(p1->zp.x-p0->zp.x)*(float)(p2->zp.y-p0->zp.y)-
|
||
|
|
; (float)(p2->zp.x-p0->zp.x)*(float)(p1->zp.y-p0->zp.y);
|
||
|
|
;
|
||
|
|
; if (norm == 0) return;
|
||
|
|
;
|
||
|
|
; front = norm < 0.0;
|
||
|
|
; front = front ^ c->current_front_face;
|
||
|
|
;
|
||
|
|
; /* back face culling */
|
||
|
|
; if (c->cull_face_enabled) {
|
||
|
|
; /* most used case first */
|
||
|
|
; if (c->current_cull_face == GL_BACK) {
|
||
|
|
; if (front == 0) return;
|
||
|
|
; c->draw_triangle_front(c,p0,p1,p2);
|
||
|
|
; } else if (c->current_cull_face == GL_FRONT) {
|
||
|
|
; if (front != 0) return;
|
||
|
|
; c->draw_triangle_back(c,p0,p1,p2);
|
||
|
|
; } else {
|
||
|
|
; return;
|
||
|
|
; }
|
||
|
|
; } else {
|
||
|
|
; /* no culling */
|
||
|
|
; if (front) {
|
||
|
|
; c->draw_triangle_front(c,p0,p1,p2);
|
||
|
|
; } else {
|
||
|
|
; c->draw_triangle_back(c,p0,p1,p2);
|
||
|
|
; }
|
||
|
|
; }
|
||
|
|
; } else {
|
||
|
|
; c_and=cc[0] & cc[1] & cc[2];
|
||
|
|
; if (c_and==0) {
|
||
|
|
; gl_draw_triangle_clip(c,p0,p1,p2,0);
|
||
|
|
; }
|
||
|
|
; }
|
||
|
|
;}
|
||
|
|
|
||
|
|
;static void gl_draw_triangle_clip(GLContext *c, GLVertex *p0,GLVertex *p1,GLVertex *p2,int clip_bit)
|
||
|
|
;{
|
||
|
|
; int co,c_and,co1,cc[3],edge_flag_tmp,clip_mask;
|
||
|
|
; GLVertex tmp1,tmp2,*q[3];
|
||
|
|
; float tt;
|
||
|
|
|
||
|
|
; cc[0]=p0->clip_code;
|
||
|
|
; cc[1]=p1->clip_code;
|
||
|
|
; cc[2]=p2->clip_code;
|
||
|
|
|
||
|
|
; co=cc[0] | cc[1] | cc[2];
|
||
|
|
; if (co == 0) {
|
||
|
|
; gl_draw_triangle(c,p0,p1,p2);
|
||
|
|
; } else {
|
||
|
|
; c_and=cc[0] & cc[1] & cc[2];
|
||
|
|
; /* the triangle is completely outside */
|
||
|
|
; if (c_and!=0) return;
|
||
|
|
|
||
|
|
; /* find the next direction to clip */
|
||
|
|
; while (clip_bit < 6 && (co & (1 << clip_bit)) == 0) {
|
||
|
|
; clip_bit++;
|
||
|
|
; }
|
||
|
|
|
||
|
|
; /* this test can be true only in case of rounding errors */
|
||
|
|
; if (clip_bit == 6) {
|
||
|
|
;#if 0
|
||
|
|
; 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);
|
||
|
|
;#endif
|
||
|
|
; return;
|
||
|
|
; }
|
||
|
|
|
||
|
|
; clip_mask = 1 << clip_bit;
|
||
|
|
; co1=(cc[0] ^ cc[1] ^ cc[2]) & clip_mask;
|
||
|
|
|
||
|
|
; if (co1) {
|
||
|
|
; /* one point outside */
|
||
|
|
|
||
|
|
; if (cc[0] & clip_mask) { q[0]=p0; q[1]=p1; q[2]=p2; }
|
||
|
|
; else if (cc[1] & clip_mask) { q[0]=p1; q[1]=p2; q[2]=p0; }
|
||
|
|
; else { q[0]=p2; q[1]=p0; q[2]=p1; }
|
||
|
|
;
|
||
|
|
; tt=clip_proc[clip_bit](&tmp1.pc,&q[0]->pc,&q[1]->pc);
|
||
|
|
; updateTmp(c,&tmp1,q[0],q[1],tt);
|
||
|
|
;
|
||
|
|
; tt=clip_proc[clip_bit](&tmp2.pc,&q[0]->pc,&q[2]->pc);
|
||
|
|
; updateTmp(c,&tmp2,q[0],q[2],tt);
|
||
|
|
;
|
||
|
|
; tmp1.edge_flag=q[0]->edge_flag;
|
||
|
|
; edge_flag_tmp=q[2]->edge_flag;
|
||
|
|
; q[2]->edge_flag=0;
|
||
|
|
; gl_draw_triangle_clip(c,&tmp1,q[1],q[2],clip_bit+1);
|
||
|
|
;
|
||
|
|
; tmp2.edge_flag=0;
|
||
|
|
; tmp1.edge_flag=0;
|
||
|
|
; q[2]->edge_flag=edge_flag_tmp;
|
||
|
|
; gl_draw_triangle_clip(c,&tmp2,&tmp1,q[2],clip_bit+1);
|
||
|
|
; } else {
|
||
|
|
; /* two points outside */
|
||
|
|
|
||
|
|
; if ((cc[0] & clip_mask)==0) { q[0]=p0; q[1]=p1; q[2]=p2; }
|
||
|
|
; else if ((cc[1] & clip_mask)==0) { q[0]=p1; q[1]=p2; q[2]=p0; }
|
||
|
|
; else { q[0]=p2; q[1]=p0; q[2]=p1; }
|
||
|
|
|
||
|
|
; tt=clip_proc[clip_bit](&tmp1.pc,&q[0]->pc,&q[1]->pc);
|
||
|
|
; updateTmp(c,&tmp1,q[0],q[1],tt);
|
||
|
|
|
||
|
|
; tt=clip_proc[clip_bit](&tmp2.pc,&q[0]->pc,&q[2]->pc);
|
||
|
|
; updateTmp(c,&tmp2,q[0],q[2],tt);
|
||
|
|
|
||
|
|
; tmp1.edge_flag=1;
|
||
|
|
; tmp2.edge_flag=q[2]->edge_flag;
|
||
|
|
; gl_draw_triangle_clip(c,q[0],&tmp1,&tmp2,clip_bit+1);
|
||
|
|
; }
|
||
|
|
; }
|
||
|
|
;}
|
||
|
|
|
||
|
|
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
|
||
|
|
|
||
|
|
;#ifdef PROFILE
|
||
|
|
;int count_triangles,count_triangles_textured,count_pixels;
|
||
|
|
;#endif
|
||
|
|
|
||
|
|
align 4
|
||
|
|
proc gl_draw_triangle_fill uses eax edx, context:dword, p0:dword,p1:dword,p2:dword
|
||
|
|
;#ifdef PROFILE
|
||
|
|
; {
|
||
|
|
; 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;
|
||
|
|
; count_triangles++;
|
||
|
|
; }
|
||
|
|
;#endif
|
||
|
|
|
||
|
|
mov edx,[context]
|
||
|
|
cmp dword[edx+offs_cont_texture_2d_enabled],0
|
||
|
|
je .els_i
|
||
|
|
;if (context.texture_2d_enabled)
|
||
|
|
;#ifdef PROFILE
|
||
|
|
; count_triangles_textured++;
|
||
|
|
;#endif
|
||
|
|
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]
|
||
|
|
; ZB_fillTriangleMappingPerspective, dword[edx+offs_cont_zb],&p0->zp,&p1->zp,&p2->zp);
|
||
|
|
jmp .end_f
|
||
|
|
.els_i:
|
||
|
|
cmp dword[edx+offs_cont_current_shade_model],GL_SMOOTH
|
||
|
|
jne .els
|
||
|
|
;else if (context.current_shade_model == GL_SMOOTH)
|
||
|
|
; ZB_fillTriangleSmooth, dword[edx+offs_cont_zb],&p0->zp,&p1->zp,&p2->zp);
|
||
|
|
jmp .end_f
|
||
|
|
.els:
|
||
|
|
; ZB_fillTriangleFlat, dword[edx+offs_cont_zb],&p0->zp,&p1->zp,&p2->zp);
|
||
|
|
.end_f:
|
||
|
|
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
|
||
|
|
@@:
|
||
|
|
add 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
|
||
|
|
@@:
|
||
|
|
add 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
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|